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WO2018142531A1 - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
WO2018142531A1
WO2018142531A1 PCT/JP2017/003751 JP2017003751W WO2018142531A1 WO 2018142531 A1 WO2018142531 A1 WO 2018142531A1 JP 2017003751 W JP2017003751 W JP 2017003751W WO 2018142531 A1 WO2018142531 A1 WO 2018142531A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
indoor
current value
indoor fan
air
Prior art date
Application number
PCT/JP2017/003751
Other languages
French (fr)
Japanese (ja)
Inventor
宏満 菊地
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2017/003751 priority Critical patent/WO2018142531A1/en
Publication of WO2018142531A1 publication Critical patent/WO2018142531A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control

Definitions

  • the present invention relates to an air conditioner, and more particularly to an overcurrent suppressing function of an indoor unit.
  • the heat pump type air conditioner includes an outdoor unit that is a heat source side unit and an indoor unit that is a load side unit.
  • the outdoor unit includes a compressor and an outdoor heat exchanger, and the indoor unit includes an expansion valve, an indoor heat exchanger, an indoor fan, and a motor.
  • the refrigerant circuit is configured such that the outdoor unit and the indoor unit are connected by a refrigerant pipe and the refrigerant circulates.
  • the air conditioner absorbs heat from the air in the air-conditioning target space that is the heat exchange target during the cooling operation and evaporates the refrigerant, and during the heating operation, the air is converted to the air in the air-conditioning target space that is the heat exchange target.
  • the refrigerant is condensed by dissipating heat, and air conditioning of the air-conditioning target space is performed.
  • an indoor fan driving method of the indoor unit there is a pulley driving method in which an indoor fan and a motor for driving the indoor fan are connected by a pulley belt (for example, see Patent Document 1).
  • the rotational speed of the indoor fan is changed and the air volume is adjusted.
  • the air conditioner may increase the operating current value of the indoor unit due to voltage fluctuation, static pressure change, etc. during operation of the indoor unit, but if the operating current value continues to increase and exceeds the abnormal stop current value It is determined that there is an abnormality and the operation of the indoor unit is stopped. Therefore, even if the operating current value of the indoor unit continues to increase, in order to avoid the abnormal stop of the indoor unit and continue the operation, the rotational speed of the indoor fan is reduced during the operation of the indoor unit, It is necessary to suppress the operating current value of the unit below the abnormal stop current value.
  • the indoor unit of the air conditioner may be used as a high-temperature and high-humidity room or an external air conditioner in which the temperature and humidity are controlled with high accuracy and constant.
  • the basic specification is to continue the operation of the indoor fan and continue to supply air to the indoor heat exchanger, so the operation of the indoor unit due to voltage fluctuation, static pressure change, etc. during the operation of the indoor unit. Even when the current value rises, it is necessary to continue the operation of the indoor fan. Therefore, it is necessary to reduce the number of rotations of the indoor fan during operation of the indoor unit and to suppress the operation current value of the indoor unit to be equal to or less than the abnormal stop current value.
  • the present invention has been made to solve the above-described problems, and even when the operating current value of the indoor unit increases, the increase of the operating current value can be suppressed and the operation of the indoor unit can be continued.
  • the object is to provide an air conditioner.
  • An air conditioner includes an outdoor unit and an indoor unit, and the indoor unit blows air to an indoor heat exchanger that exchanges heat between air and a refrigerant, and to the indoor heat exchanger.
  • a determination unit that determines whether the operating current value detected by the current detection unit exceeds a reference current value, wherein the reference current value is lower than an abnormal stop current value at which the indoor unit abnormally stops
  • the rotation control unit is configured to reduce the rotation speed of the indoor fan when the determination unit determines that the operating current value exceeds the reference current value.
  • the rotation control unit decreases the rotation speed of the indoor fan when the determination unit determines that the operating current value exceeds the reference current value. Therefore, even when the operating current value of the indoor unit increases, the number of rotations of the indoor fan can be reduced to suppress the increase of the operating current value and the operation of the indoor unit can be continued.
  • FIG. 1 It is a figure which shows the refrigerant circuit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the inside of the indoor unit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a functional block diagram of the control apparatus and remote control of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the air volume-static pressure characteristic of the indoor fan of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows control of the indoor unit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows control of the indoor unit of the air conditioning apparatus which concerns on Embodiment 2 of this invention.
  • FIG. 1 is a diagram illustrating a refrigerant circuit of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
  • the air-conditioning apparatus 1 according to Embodiment 1 includes an outdoor unit 10 and an indoor unit 20.
  • the air conditioner 1 includes a refrigerant circuit in which the outdoor unit 10 and the indoor unit 20 are connected by a refrigerant pipe and the refrigerant circulates.
  • the outdoor unit 10 includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a supercooling heat exchanger 14, an outdoor expansion valve 15, a first operation valve 16, a second operation valve 17, and an accumulator 18.
  • the indoor unit 20 includes an indoor expansion device 21, an indoor heat exchanger 22, and an indoor fan 23.
  • the compressor 11, the four-way valve 12, the outdoor heat exchanger 13, the supercooling heat exchanger 14, the indoor expansion device 21, the indoor heat exchanger 22, and the accumulator 18 are sequentially connected by refrigerant piping.
  • the compressor 11 compresses the refrigerant to a high temperature and a high pressure.
  • the four-way valve 12 is a flow path switching means for switching the connection relationship in the refrigerant circuit in accordance with an operation state such as cooling operation or heating operation.
  • a device other than the four-way valve 12 such as a combination of a two-way valve and a three-way valve may be used.
  • the outdoor heat exchanger 13 is, for example, a fin-and-tube type constituted by a heat transfer tube and a large number of fins, and performs heat exchange between the refrigerant and the outdoor air.
  • the outdoor heat exchanger 13 acts as a condenser during the cooling operation, and acts as an evaporator during the heating operation.
  • the supercooling heat exchanger 14 is, for example, a double tube type configured by combining circular pipes having different pipe diameters, and supercools the refrigerant flowing from the outdoor heat exchanger 13 to the indoor unit 20 during the cooling operation. Is to do.
  • the first operation valve 16 is provided in a refrigerant pipe connecting the supercooling heat exchanger 14 and the indoor unit 20 and opens and closes the refrigerant flow path.
  • the 2nd operation valve 17 is provided in the refrigerant
  • the accumulator 18 is provided between the suction side of the compressor 11 and the four-way valve 12 and stores excess refrigerant.
  • the outdoor expansion valve 15 branches from between the supercooling heat exchanger 14 and the first operation valve 16, and is provided in a refrigerant pipe connected between the accumulator 18 and the four-way valve 12.
  • the outdoor expansion valve 15 is composed of, for example, an electronic expansion valve, and adjusts the flow rate of the refrigerant by setting the opening, and functions as a pressure reducing valve or an expansion valve to decompress and expand the refrigerant. is there.
  • the indoor throttling device 21 is composed of, for example, an electronic expansion valve, and adjusts the refrigerant flow rate by setting the opening, and functions as a decompression valve or an expansion valve to decompress and expand the refrigerant.
  • the indoor side heat exchanger 22 is, for example, a fin-and-tube type constituted by a heat transfer tube and a large number of fins, and performs heat exchange between the refrigerant and room air.
  • the indoor heat exchanger 22 acts as an evaporator during the cooling operation, and acts as a condenser during the heating operation.
  • the indoor fan 23 supplies air to the indoor heat exchanger 22 and is rotated by an inverter.
  • the indoor fan 23 can adjust the air volume by changing the rotational speed.
  • the indoor unit 20 includes a control device 50 that controls the operation of the indoor fan 23 and the like, and a remote controller 60 that can transmit and receive information to and from the control device 50. Note that the control device 50 and the remote controller 60 are connected by wire or wirelessly.
  • the control device 50 controls the operation of the air conditioner 1 based on the information received from the remote controller 60, and transmits the operating status of the indoor unit 20 to the remote controller 60.
  • the remote controller 60 transmits information received from the user to the control device 50, and the operating status of the indoor unit 20 is displayed on the display unit 63 (see FIG. 3 described later) based on the information received from the control device 50. Display and inform the user.
  • the refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 13 through the four-way valve 12 and exchanges heat with outdoor air in the outdoor heat exchanger 13.
  • the refrigerant that has exchanged heat with outdoor air in the outdoor heat exchanger 13 is subcooled in the supercooling heat exchanger 14 and then flows into the indoor unit 20. At this time, a part of the refrigerant flows into the supercooling heat exchanger 14 via the outdoor expansion valve 15 and then flows into the accumulator 18.
  • the refrigerant that has flowed into the indoor unit 20 is depressurized by the indoor expansion device 21, and then flows into the indoor heat exchanger 22, where it heat-exchanges with the indoor air to cool the indoor air. Thereafter, the refrigerant flowing out of the indoor heat exchanger 22 is stored in the accumulator 18 via the four-way valve 12 of the outdoor unit 10, and the refrigerant stored in the accumulator 18 is again sucked into the compressor 11.
  • FIG. 2 is a perspective view showing the inside of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
  • the arrow in FIG. 2 has shown the flow of the wind.
  • the indoor unit 20 has a housing 26 having a suction port (not shown) in the lower portion and an air outlet 25 formed in the upper portion.
  • the device 22, the indoor fan 23, the motor 24 for driving the indoor fan 23, and the control device 50 are accommodated.
  • An indoor fan 23 and a motor 24 are disposed above the indoor heat exchanger 22, and a control device 50 is disposed below the indoor heat exchanger 22.
  • the indoor fan 23 is composed of, for example, a sirocco fan, and is rotationally driven by driving of a motor 24. By this rotational driving, the indoor fan 23 is moved upward from a suction port below the indoor heat exchanger 22 inside. An air flow toward the air outlet 25 is formed. And the air blown out from the blower outlet 25 is supplied to the indoor load side by direct blowing or duct connection. The operation of the indoor fan 23 is controlled by the control device 50.
  • FIG. 3 is a functional block diagram of control device 50 and remote control 60 of air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
  • the control device 50 includes a rotation control unit 51, a current detection unit 52, an air volume calculation unit 53, a determination unit 54, and a communication unit 55.
  • the operation of the indoor fan 23 is controlled based on the above.
  • the control device 50 is, for example, dedicated hardware or a CPU that executes a program stored in a memory (also referred to as a central processing unit, a central processing unit, a processing unit, a processing unit, a microprocessor, a microcomputer, or a processor). It consists of
  • the rotation control unit 51 controls the rotation speed of the indoor fan 23 by driving the motor 24 with an inverter. In the case of inverter driving, the rotation control unit 51 controls the rotation of the indoor fan 23 so that the rotation speed N is set by the remote controller 60. The rotation speed N is controlled.
  • the current detector 52 detects the operating current value I supplied to the motor 24.
  • the rotation control unit 51 basically controls the rotation speed N of the indoor fan 23 so that the rotation speed N is set by the remote controller 60.
  • the rotation control unit 51 prevents the stall prevention.
  • the rotational speed N of the indoor fan 23 is controlled so as to be smaller than the operation level current value Is. That is, the rotation control unit 51 decreases the rotation speed N of the indoor fan 23.
  • the air volume calculation unit 53 calculates the air volume Q blown from the indoor fan 23 from the value of the operating current value I detected by the current detection unit 52 and the rotation speed N of the indoor fan 23 controlled by the rotation control unit 51. It is. That is, when the motor 24 is inverter-driven as described above, the operating current value I, the rotational speed N, and the air volume Q have a predetermined relationship.
  • the air volume calculation unit 53 stores the relationship between the operating current value I, the rotational speed N, and the air volume Q according to the model of the indoor fan 23. Based on the relationship, the operating current value I and the rotational speed are stored.
  • the air volume Q is calculated from N.
  • the determination unit 54 controls the indoor unit 20 according to the operating current value I and the rotational speed N.
  • the control device 50 sets the stall prevention operation level current value Is to a level lower than the abnormal stop current value, so that the rotational speed N of the indoor fan 23 can be set even if the operating current value I increases for some reason. It has control which makes it decrease and suppresses the operating current value I of an indoor unit below an abnormal stop current value, and prevents the indoor unit 20 from stopping abnormally.
  • the stall prevention operation level current value Is is a maximum current value when the indoor unit 20 is not used at the maximum load.
  • the communication unit 55 transmits and receives information such as the rotation speed N of the indoor fan 23 to and from the remote controller 60.
  • the remote controller 60 includes an operation unit 61, a remote control side communication unit 62, and a display unit 63, and transmits information received from the user to the control device 50.
  • the operation unit 61 is composed of buttons, for example, and receives information from the user.
  • the remote controller side communication unit 62 transmits and receives information received from the user to and from the communication unit 55.
  • the display unit 63 displays the operating status of the indoor unit 20 based on the information received from the communication unit 55 and notifies the user.
  • FIG. 4 is a diagram showing an example of the air volume-static pressure characteristics of the indoor fan 23 of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
  • the horizontal axis indicates the amount of air blown from the indoor fan 23, and the vertical axis indicates the total static pressure.
  • the static pressure range in which the indoor fan 23 can be operated is the total static pressure.
  • P 390 to 1240 [Pa].
  • the settable rotation speed N of the indoor fan 23 is determined by the model of the indoor unit 20, and in the first embodiment, the rotation control unit 51 sets the rotation speed N of the indoor fan 23 to the maximum rotation speed. It is possible to set from a certain N1 to a minimum rotational speed N7.
  • FIG. 5 is a flowchart showing control of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
  • control of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 1 will be described with reference to FIG.
  • the rotation control unit 51 starts the operation of the indoor fan 23 at the initial rotation number N0.
  • the current detection unit 52 samples the operation current value I every predetermined time (for example, 30 seconds). Then, the determination unit 54 determines whether or not the operating current value I exceeds the stall prevention operation level current value Is (step S101).
  • step S101 If the determination unit 54 determines that the operating current value I exceeds the stall prevention operation level current value Is (Yes in step S101), the process proceeds to step S102. On the other hand, when the determination unit 54 determines that the operating current value I does not exceed the stall prevention operation level current value Is (No in step S101), the process proceeds to step S105.
  • step S102 the determination unit 54 determines whether or not the rotation speed N of the indoor fan 23 is the minimum rotation speed Nmin (N7). If the determination unit 54 determines that the rotation speed N of the indoor fan 23 is the minimum rotation speed Nmin (Yes in step S102), the determination unit 54 abnormally stops the indoor unit 20 (step S103), and returns to step S101. On the other hand, when the determination unit 54 determines that the rotation speed N of the indoor fan 23 is not the minimum rotation speed Nmin (No in step S102), the rotation control unit 51 decreases the rotation speed N of the indoor fan 23 from the current level. Then, the indoor fan 23 is operated (step S104), and the process returns to step S101. For example, when the current rotation speed N of the indoor fan 23 is set to N1, the rotation control unit 51 sets the rotation speed N to N2 and operates the indoor fan 23.
  • step S105 the determination unit 54 determines whether or not the rotational speed N of the indoor fan 23 is the initial rotational speed N0.
  • the rotation control unit 51 continues the operation of the indoor fan 23 at the initial rotation speed N0 (Ste S106) and return to Step S101.
  • the determination unit 54 determines that the rotation speed N of the indoor fan 23 is not the initial rotation speed N0 (No in step S105)
  • the process proceeds to step S107.
  • step S107 the determination unit 54 determines whether or not the rotation speed N of the indoor fan 23 is the maximum rotation speed Nmax (N1). If the determination unit 54 determines that the rotation speed N of the indoor fan 23 is the maximum rotation speed Nmax (Yes in step S107), the determination unit 54 returns to step S101. On the other hand, when the determination unit 54 determines that the rotation speed N of the indoor fan 23 is not the maximum rotation speed Nmax (No in step S107), the rotation control unit 51 increases the rotation speed N of the indoor fan 23 more than the current time. Then, the indoor fan 23 is operated (step S108), and the process returns to step S101. For example, when the current rotation speed N of the indoor fan 23 is set to N7, the rotation control unit 51 operates the indoor fan 23 with the rotation speed N set to N6.
  • the air-conditioning apparatus 1 includes the outdoor unit 10 and the indoor unit 20, and the indoor unit 20 includes the indoor-side heat exchanger 22 that performs heat exchange between the air and the refrigerant,
  • the indoor fan 23 that blows air to the indoor heat exchanger 22 and a control device 50 that controls the indoor unit 20 are provided.
  • the control device 50 includes a rotation control unit 51 that controls the rotation speed of the indoor fan 23, and an indoor fan.
  • a current detection unit 52 that detects the operation current value of 23, and a determination unit 54 that determines whether or not the operation current value detected by the current detection unit 52 exceeds the stall prevention operation level current value Is.
  • the operation level current value Is is set to a level lower than the abnormal stop current value at which the indoor unit 20 abnormally stops.
  • the rotation control unit 51 determines that the operation unit current has a stall prevention operation level voltage. If it is determined that exceeds the value it Is, is intended to reduce the rotation speed of the indoor fan 23.
  • the stall prevention operation level current value Is is set to a level lower than the abnormal stop current value at which the indoor unit 20 stops abnormally, and the operating current value I increases to cause the stall.
  • the prevention operation level current value Is is exceeded, the rotational speed N of the indoor fan 23 is decreased. By doing so, it is possible to reduce the operating current value I and prevent the indoor unit 20 from immediately stopping abnormally. That is, the operation of the indoor unit 20 can be continued while suppressing an increase in the operating current value I.
  • Embodiment 2 of the present invention will be described, but the description overlapping with Embodiment 1 will be omitted, and the same reference numerals will be given to the same or corresponding parts as those in Embodiment 1.
  • the operating current value I prevents the stall even if the rotational speed N of the indoor fan 23 is the minimum rotational speed.
  • the operation level current value Is is exceeded, and the indoor unit 20 is abnormally stopped.
  • the user notices an abnormality in the indoor unit 20 for the first time. Therefore, the user cannot notice the abnormality until the indoor unit 20 abnormally stops.
  • the air conditioner 1 when any abnormality such as voltage fluctuation or static pressure change occurs in the indoor unit 20, the user notices that before the indoor unit 20 abnormally stops. It is to be able to let you.
  • FIG. 6 is a flowchart showing control of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 2 of the present invention.
  • control of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 2 will be described with reference to FIG.
  • the rotation control unit 51 starts the operation of the indoor fan 23 at the initial rotation number N0.
  • the current detection unit 52 samples the operation current value I every predetermined time (for example, 30 seconds). Then, the determination unit 54 determines whether or not the operating current value I exceeds the stall prevention operation level current value Is (step S101).
  • step S101 If the determination unit 54 determines that the operating current value I exceeds the stall prevention operation level current value Is (Yes in step S101), the process proceeds to step S102. On the other hand, when the determination unit 54 determines that the operating current value I does not exceed the stall prevention operation level current value Is (No in step S101), the process proceeds to step S105. Steps S105 to S108 are the same as those in the first embodiment, and thus description thereof is omitted.
  • step S102 the determination unit 54 determines whether or not the rotation speed N of the indoor fan 23 is the minimum rotation speed Nmin (N7). If the determination unit 54 determines that the rotation speed N of the indoor fan 23 is the minimum rotation speed Nmin (Yes in step S102), the determination unit 54 abnormally stops the indoor unit 20 (step S103), and returns to step S101. On the other hand, when the determination unit 54 determines that the rotation speed N of the indoor fan 23 is not the minimum rotation speed Nmin (No in step S102), the rotation control unit 51 decreases the rotation speed N of the indoor fan 23 from the current level. Then, the indoor fan 23 is operated (step S104), and the process proceeds to step S201.
  • step S201 the rotation control unit 51 has decreased the number of rotations N of the indoor fan 23 from the current time, so the number of rotations is decreased by 1, and the process proceeds to step S202. It should be noted that the number of revolutions in the initial state is zero.
  • step S202 the determination unit 54 determines whether or not the number of rotations is reduced once. If the determination unit 54 determines that the number of revolutions is not one (No in step S202), the determination unit 54 proceeds to step S204. On the other hand, when the determination unit 54 determines that the number of rotations is decreased (Yes in step S202), the rotation control unit 51 starts counting the timer T (step S203), and proceeds to step S204.
  • step S204 the determination unit 54 determines whether or not the timer T has reached the reference number of times (for example, 3 times) within ⁇ T. If the timer T determines that the number of rotations down has not reached the reference number within ⁇ T, that is, less than the reference number (No in step S204), the determination unit 54 returns to step S101. On the other hand, when the determination unit 54 determines that the number of rotations down reaches the reference number within ⁇ T (Yes in step S204), the communication unit 55 notifies the remote controller 60 of the abnormality (step S205). Return to step S101.
  • the reference number of times for example, 3 times
  • the number of rotation speed reductions is reset when the communication unit 55 notifies the remote controller 60 of an abnormality or when the indoor unit 20 stops.
  • the timer T is reset when ⁇ T has elapsed since the count started, when the communication unit 55 notifies the remote controller 60 of an abnormality, or when the indoor unit 20 is stopped.
  • the display unit 63 is notified of the abnormality.
  • the remote controller 60 may be provided with sound generating means such as a buzzer, and a sound may be generated by the sound generating means to notify the abnormality, or the remote controller 60 may be provided with light emitting means such as an LED. The abnormality may be notified by blinking the light emitting means.
  • the number of times that the determination unit 54 does not determine that an abnormality has occurred when it occurs temporarily in the course of operation, not due to an abnormality In addition, when the abnormality occurs, the number of times that the communication unit 55 can notify the user as soon as possible is, for example, three times, but is not limited thereto.
  • the determination unit 54 does not determine that an abnormality has occurred.
  • the time is set according to the number of times of reference.
  • the control device 50 includes the communication unit 55 that transmits and receives information to and from the remote controller 60, and the rotation control unit 51 determines the rotation speed of the indoor fan 23. If it is decreased, the number of rotations down is counted, and if the determination unit 54 determines that the number of rotations down has reached the reference number, the communication unit 55 notifies the remote controller 60 of the abnormality.
  • the operation of the indoor unit 20 is continued while reducing the rotation speed of the indoor fan 23.
  • the remote controller 60 Abnormality is notified. Therefore, when any abnormality such as voltage fluctuation or static pressure change occurs in the indoor unit 20, it can be noticed to the user before the indoor unit 20 abnormally stops.
  • Embodiment 3 FIG.
  • Embodiment 3 of the present invention will be described, but the description overlapping with Embodiments 1 and 2 will be omitted, and the same or corresponding parts as those in Embodiments 1 and 2 will be denoted by the same reference numerals. .
  • the operating current value I exceeds the stall prevention operation level current value Is, it is assumed that the operating current value I then exceeds the abnormal stop current value.
  • the rotational speed N of the fan 23 is decreased, and the increase in the operating current value I is suppressed.
  • the usage environment of the indoor unit 20 is various and may not be used at the maximum load. For example, depending on the usage environment of the indoor unit 20, there may be no problem in the operating range where the operating current value I is up to I3.
  • the wiring diameter of the indoor unit 20 is determined based on the maximum current within the operable range. When the indoor unit 20 is not used at the maximum load, the wiring diameter is over-specification, and the construction cost is excessive. there is a possibility.
  • the stall prevention operation level current value Is can be set from the remote controller 60, and the user can prevent stall according to the usage environment of the indoor unit 20.
  • the operating level current value Is can be set.
  • the air conditioning apparatus 1 can set the stall prevention operation level current value Is from the remote controller 60.
  • the user can set the stall prevention operation level current value Is according to the usage environment of the indoor unit 20, so that the indoor unit 20 according to the operation range can be set.
  • the wire diameter can be selected, and construction costs can be reduced.
  • the stall prevention operation level current value Is corresponds to the “reference current value” of the present invention.

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
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  • General Engineering & Computer Science (AREA)
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Abstract

This air conditioner is provided with an outdoor unit and an indoor unit. The indoor unit is provided with: an indoor side heat exchanger that exchanges heat between air and a refrigerant; an indoor fan that blows air to the indoor side heat exchanger; and a control device that controls the indoor unit. The control device is provided with: a rotation control unit that controls the rotational speed of the indoor fan; a current detection unit that detects the operation current value of the indoor fan; and a determination unit that determines whether the operation current value detected by the current detection unit exceeds a reference current value. The reference current value is set to a level lower than an abnormal stop current value at which the indoor unit stops because of abnormality. The rotation control unit reduces the rotational speed of the indoor fan when the determination unit determines that the operation current value exceeds the reference current value.

Description

空気調和装置Air conditioner
　本発明は、空気調和装置に関し、特に室内ユニットの過電流抑制機能に関するものである。 The present invention relates to an air conditioner, and more particularly to an overcurrent suppressing function of an indoor unit.
　従来、空気調和装置として、冷媒回路を使用したヒートポンプ方式が知られている。ヒートポンプ方式の空気調和装置は、熱源側ユニットである室外ユニットと負荷側ユニットである室内ユニットとを備えている。室外ユニットは、圧縮機と、室外側熱交換器とを有しており、室内ユニットは、膨張弁と、室内側熱交換器と、室内ファンと、モータとを有している。また、冷媒回路は、室外ユニットと室内ユニットとが冷媒配管で接続され、冷媒が循環するように構成されている。 Conventionally, a heat pump system using a refrigerant circuit is known as an air conditioner. The heat pump type air conditioner includes an outdoor unit that is a heat source side unit and an indoor unit that is a load side unit. The outdoor unit includes a compressor and an outdoor heat exchanger, and the indoor unit includes an expansion valve, an indoor heat exchanger, an indoor fan, and a motor. In addition, the refrigerant circuit is configured such that the outdoor unit and the indoor unit are connected by a refrigerant pipe and the refrigerant circulates.
　そして、空気調和装置は、室内側熱交換器において、冷房運転時には熱交換対象である空調対象空間の空気から吸熱して冷媒を蒸発させ、暖房運転時には熱交換対象である空調対象空間の空気へ放熱することで冷媒を凝縮させ、空調対象空間の空気調和を行う。 In the indoor heat exchanger, the air conditioner absorbs heat from the air in the air-conditioning target space that is the heat exchange target during the cooling operation and evaporates the refrigerant, and during the heating operation, the air is converted to the air in the air-conditioning target space that is the heat exchange target. The refrigerant is condensed by dissipating heat, and air conditioning of the air-conditioning target space is performed.
　また、室内ユニットが有する室内ファンの駆動方式として、室内ファンと室内ファンを駆動するモータとをプーリーベルトで接続したプーリー駆動方式がある（例えば、特許文献１参照）。 Further, as an indoor fan driving method of the indoor unit, there is a pulley driving method in which an indoor fan and a motor for driving the indoor fan are connected by a pulley belt (for example, see Patent Document 1).
　プーリー駆動方式の室内ユニットでは、室内ファンに設けられたプーリーの径およびモータに設けられたプーリーの径を変更することにより、室内ファンの回転数が変更されて、風量が調整される。 In the pulley drive type indoor unit, by changing the diameter of the pulley provided in the indoor fan and the diameter of the pulley provided in the motor, the rotational speed of the indoor fan is changed and the air volume is adjusted.
　空気調和装置は、室内ユニットの運転中に電圧変動、静圧変化などにより室内ユニットの運転電流値が上昇することがあるが、運転電流値が上昇し続けて異常停止電流値を超えてしまったら異常と判定し、室内ユニットの運転を停止させるようになっている。そのため、室内ユニットの運転電流値が上昇し続けた場合でも、室内ユニットの異常停止を回避して運転を継続させるためには、室内ユニットの運転中に室内ファンの回転数を減少させて、室内ユニットの運転電流値を異常停止電流値以下に抑制する必要がある。 The air conditioner may increase the operating current value of the indoor unit due to voltage fluctuation, static pressure change, etc. during operation of the indoor unit, but if the operating current value continues to increase and exceeds the abnormal stop current value It is determined that there is an abnormality and the operation of the indoor unit is stopped. Therefore, even if the operating current value of the indoor unit continues to increase, in order to avoid the abnormal stop of the indoor unit and continue the operation, the rotational speed of the indoor fan is reduced during the operation of the indoor unit, It is necessary to suppress the operating current value of the unit below the abnormal stop current value.
　また、空気調和装置の室内ユニットは、温度および湿度が高精度で一定に制御された高温高湿室または外調機として使用される場合がある。そのような場合、室内ファンの運転を継続させて室内側熱交換器に風を供給し続けるのが基本仕様であるため、室内ユニットの運転中に電圧変動、静圧変化などにより室内ユニットの運転電流値が上昇した場合でも、室内ファンの運転を継続させる必要がある。そのため、室内ユニットの運転中に室内ファンの回転数を減少させて、室内ユニットの運転電流値を異常停止電流値以下に抑制する必要がある。 Also, the indoor unit of the air conditioner may be used as a high-temperature and high-humidity room or an external air conditioner in which the temperature and humidity are controlled with high accuracy and constant. In such a case, the basic specification is to continue the operation of the indoor fan and continue to supply air to the indoor heat exchanger, so the operation of the indoor unit due to voltage fluctuation, static pressure change, etc. during the operation of the indoor unit. Even when the current value rises, it is necessary to continue the operation of the indoor fan. Therefore, it is necessary to reduce the number of rotations of the indoor fan during operation of the indoor unit and to suppress the operation current value of the indoor unit to be equal to or less than the abnormal stop current value.
特開２０１５－１５５７６４号公報Japanese Patent Laying-Open No. 2015-155664
　しかしながら、従来の空気調和装置において、プーリー駆動方式の室内ユニットでは、室内ファンに設けられたプーリーの径およびモータに設けられたプーリーの径を、室内ユニットの運転中に変更することはできない。そのため、室内ユニットの運転中に電圧変動、静圧変化などにより室内ユニットの運転電流値が上昇した場合、室内ユニットの運転電流値を異常停止電流値以下に抑制することができず、室内ユニットの運転を継続させることができないという課題があった。 However, in a conventional air conditioner, in a pulley drive type indoor unit, the diameter of the pulley provided in the indoor fan and the diameter of the pulley provided in the motor cannot be changed during operation of the indoor unit. For this reason, if the indoor unit operating current value increases due to voltage fluctuation, static pressure change, etc. during operation of the indoor unit, the indoor unit operating current value cannot be suppressed below the abnormal stop current value. There was a problem that driving could not be continued.
　本発明は、以上のような課題を解決するためになされたもので、室内ユニットの運転電流値が上昇した場合でも、運転電流値の上昇を抑制し、室内ユニットの運転を継続させることができる空気調和装置を提供することを目的としている。 The present invention has been made to solve the above-described problems, and even when the operating current value of the indoor unit increases, the increase of the operating current value can be suppressed and the operation of the indoor unit can be continued. The object is to provide an air conditioner.
　本発明に係る空気調和装置は、室外ユニットと室内ユニットとを備え、前記室内ユニットは、空気と冷媒との間で熱交換を行う室内側熱交換器と、前記室内側熱交換器に送風する室内ファンと、前記室内ユニットを制御する制御装置と、を備え、前記制御装置は、前記室内ファンの回転数を制御する回転制御部と、前記室内ファンの運転電流値を検知する電流検知部と、前記電流検知部が検知した前記運転電流値が基準電流値を超えているかどうかを判定する判定部と、を備え、前記基準電流値は、前記室内ユニットが異常停止する異常停止電流値より低いレベルに設定されており、前記回転制御部は、前記判定部が、前記運転電流値が前記基準電流値を超えていると判定した場合、前記室内ファンの回転数を減少させるものである。 An air conditioner according to the present invention includes an outdoor unit and an indoor unit, and the indoor unit blows air to an indoor heat exchanger that exchanges heat between air and a refrigerant, and to the indoor heat exchanger. An indoor fan, and a control device that controls the indoor unit, the control device controlling a rotation speed of the indoor fan, and a current detection unit detecting an operating current value of the indoor fan. A determination unit that determines whether the operating current value detected by the current detection unit exceeds a reference current value, wherein the reference current value is lower than an abnormal stop current value at which the indoor unit abnormally stops The rotation control unit is configured to reduce the rotation speed of the indoor fan when the determination unit determines that the operating current value exceeds the reference current value.
　本発明に係る空気調和装置によれば、回転制御部は、判定部が、運転電流値が基準電流値を超えていると判定した場合、室内ファンの回転数を減少させるものである。そのため、室内ユニットの運転電流値が上昇した場合でも、室内ファンの回転数を減少させて、運転電流値の上昇を抑制し、室内ユニットの運転を継続させることができる。 According to the air conditioning apparatus of the present invention, the rotation control unit decreases the rotation speed of the indoor fan when the determination unit determines that the operating current value exceeds the reference current value. Therefore, even when the operating current value of the indoor unit increases, the number of rotations of the indoor fan can be reduced to suppress the increase of the operating current value and the operation of the indoor unit can be continued.
本発明の実施の形態１に係る空気調和装置の冷媒回路を示す図である。It is a figure which shows the refrigerant circuit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る空気調和装置の室内ユニットの内部を示す斜視図である。It is a perspective view which shows the inside of the indoor unit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る空気調和装置の制御装置およびリモコンの機能ブロック図である。It is a functional block diagram of the control apparatus and remote control of the air conditioning apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る空気調和装置の室内ファンの風量－静圧特性の一例を示す図である。It is a figure which shows an example of the air volume-static pressure characteristic of the indoor fan of the air conditioning apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る空気調和装置の室内ユニットの制御を示すフローチャートである。It is a flowchart which shows control of the indoor unit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る空気調和装置の室内ユニットの制御を示すフローチャートである。It is a flowchart which shows control of the indoor unit of the air conditioning apparatus which concerns on Embodiment 2 of this invention.
　以下、本発明の実施の形態を図面に基づいて説明する。なお、以下に説明する実施の形態によって本発明が限定されるものではない。また、以下の図面では各構成部材の大きさの関係が実際のものとは異なる場合がある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings, the relationship of the size of each component may be different from the actual one.
　実施の形態１．
　図１は、本発明の実施の形態１に係る空気調和装置１の冷媒回路を示す図である。
　図１に示すように、本実施の形態１に係る空気調和装置１は、室外ユニット１０と、室内ユニット２０とを備えている。また、空気調和装置１は、室外ユニット１０と室内ユニット２０が冷媒配管で接続され、冷媒が循環する冷媒回路を備えている。 Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a refrigerant circuit of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
As shown in FIG. 1, the air-conditioning apparatus 1 according to Embodiment 1 includes an outdoor unit 10 and an indoor unit 20. In addition, the air conditioner 1 includes a refrigerant circuit in which the outdoor unit 10 and the indoor unit 20 are connected by a refrigerant pipe and the refrigerant circulates.
　室外ユニット１０は、圧縮機１１、四方弁１２、室外側熱交換器１３、過冷却熱交換器１４、室外側膨張弁１５、第一操作弁１６、第二操作弁１７、および、アキュムレータ１８を備えている。また、室内ユニット２０は、室内絞り装置２１、室内側熱交換器２２、および、室内ファン２３を備えている。そして、圧縮機１１、四方弁１２、室外側熱交換器１３、過冷却熱交換器１４、室内絞り装置２１、室内側熱交換器２２、および、アキュムレータ１８が冷媒配管で順次接続されている。 The outdoor unit 10 includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a supercooling heat exchanger 14, an outdoor expansion valve 15, a first operation valve 16, a second operation valve 17, and an accumulator 18. I have. The indoor unit 20 includes an indoor expansion device 21, an indoor heat exchanger 22, and an indoor fan 23. The compressor 11, the four-way valve 12, the outdoor heat exchanger 13, the supercooling heat exchanger 14, the indoor expansion device 21, the indoor heat exchanger 22, and the accumulator 18 are sequentially connected by refrigerant piping.
　圧縮機１１は、冷媒を高温高圧に圧縮するものである。四方弁１２は、冷房運転、暖房運転などの運転状態に応じて冷媒回路内の接続関係を切り換える流路切り換え手段である。なお、流路切り換え手段として、例えば、二方弁および三方弁を組み合わせたものなど、四方弁１２以外のものを用いてもよい。 The compressor 11 compresses the refrigerant to a high temperature and a high pressure. The four-way valve 12 is a flow path switching means for switching the connection relationship in the refrigerant circuit in accordance with an operation state such as cooling operation or heating operation. As the flow path switching means, for example, a device other than the four-way valve 12 such as a combination of a two-way valve and a three-way valve may be used.
　室外側熱交換器１３は、例えば伝熱管と多数のフィンとにより構成されたフィンアンドチューブ型であり、冷媒と室外空気との間で熱交換を行うものである。この室外側熱交換器１３は、冷房運転時には凝縮器として作用し、暖房運転時には蒸発器として作用する。 The outdoor heat exchanger 13 is, for example, a fin-and-tube type constituted by a heat transfer tube and a large number of fins, and performs heat exchange between the refrigerant and the outdoor air. The outdoor heat exchanger 13 acts as a condenser during the cooling operation, and acts as an evaporator during the heating operation.
　過冷却熱交換器１４は、例えば異なる管径を持つ円管を組み合わせて構成された二重管式であり、冷房運転の際に室外側熱交換器１３から室内ユニット２０へ流れる冷媒の過冷却を行うものである。 The supercooling heat exchanger 14 is, for example, a double tube type configured by combining circular pipes having different pipe diameters, and supercools the refrigerant flowing from the outdoor heat exchanger 13 to the indoor unit 20 during the cooling operation. Is to do.
　第一操作弁１６は、過冷却熱交換器１４と室内ユニット２０とを接続する冷媒配管に設けられており、冷媒の流路を開閉するものである。第二操作弁１７は、四方弁１２と室内ユニット２０とを接続する冷媒配管に設けられており、冷媒の流路を開閉するものである。 The first operation valve 16 is provided in a refrigerant pipe connecting the supercooling heat exchanger 14 and the indoor unit 20 and opens and closes the refrigerant flow path. The 2nd operation valve 17 is provided in the refrigerant | coolant piping which connects the four way valve 12 and the indoor unit 20, and opens and closes the flow path of a refrigerant | coolant.
　アキュムレータ１８は、圧縮機１１の吸入側と四方弁１２との間に設けられており、余剰冷媒を貯留するものである。 The accumulator 18 is provided between the suction side of the compressor 11 and the four-way valve 12 and stores excess refrigerant.
　室外側膨張弁１５は、過冷却熱交換器１４と第一操作弁１６との間から分岐し、アキュムレータ１８と四方弁１２との間に接続された冷媒配管に設けられている。この室外側膨張弁１５は、例えば電子膨張弁で構成されており、開度が設定されることで冷媒流量を調整し、減圧弁または膨張弁として機能して冷媒を減圧して膨張させるものである。 The outdoor expansion valve 15 branches from between the supercooling heat exchanger 14 and the first operation valve 16, and is provided in a refrigerant pipe connected between the accumulator 18 and the four-way valve 12. The outdoor expansion valve 15 is composed of, for example, an electronic expansion valve, and adjusts the flow rate of the refrigerant by setting the opening, and functions as a pressure reducing valve or an expansion valve to decompress and expand the refrigerant. is there.
　室内絞り装置２１は、例えば電子膨張弁で構成されており、開度が設定されることで冷媒流量を調整し、減圧弁または膨張弁として機能して冷媒を減圧して膨張させるものである。 The indoor throttling device 21 is composed of, for example, an electronic expansion valve, and adjusts the refrigerant flow rate by setting the opening, and functions as a decompression valve or an expansion valve to decompress and expand the refrigerant.
　室内側熱交換器２２は、例えば伝熱管と多数のフィンとにより構成されたフィンアンドチューブ型であり、冷媒と室内空気との間で熱交換を行うものである。この室内側熱交換器２２は、冷房運転時には蒸発器として作用し、暖房運転時には凝縮器として作用する。 The indoor side heat exchanger 22 is, for example, a fin-and-tube type constituted by a heat transfer tube and a large number of fins, and performs heat exchange between the refrigerant and room air. The indoor heat exchanger 22 acts as an evaporator during the cooling operation, and acts as a condenser during the heating operation.
　室内ファン２３は、室内側熱交換器２２に風を供給するものであり、インバータ駆動により回転駆動される。この室内ファン２３は、回転数を変化させることにより風量の調整を行うことができるようになっている。 The indoor fan 23 supplies air to the indoor heat exchanger 22 and is rotated by an inverter. The indoor fan 23 can adjust the air volume by changing the rotational speed.
　また、室内ユニット２０は、室内ファン２３などの動作を制御する制御装置５０と、制御装置５０との間で情報の送受信が可能なリモコン６０とを備えている。なお、制御装置５０とリモコン６０とは、有線もしくは無線により接続されている。 The indoor unit 20 includes a control device 50 that controls the operation of the indoor fan 23 and the like, and a remote controller 60 that can transmit and receive information to and from the control device 50. Note that the control device 50 and the remote controller 60 are connected by wire or wirelessly.
　制御装置５０は、リモコン６０から受信した情報に基づいて空気調和装置１の動作を制御し、また、室内ユニット２０の稼働状況をリモコン６０に送信するものである。リモコン６０は、ユーザーから受け付けた情報を制御装置５０に送信するものであり、また、制御装置５０から受信した情報に基づいて室内ユニット２０の稼働状況を表示部６３（後述する図３参照）に表示してユーザーに知らせるものである。 The control device 50 controls the operation of the air conditioner 1 based on the information received from the remote controller 60, and transmits the operating status of the indoor unit 20 to the remote controller 60. The remote controller 60 transmits information received from the user to the control device 50, and the operating status of the indoor unit 20 is displayed on the display unit 63 (see FIG. 3 described later) based on the information received from the control device 50. Display and inform the user.
　次に、本実施の形態１に係る空気調和装置１の動作例として、冷房運転の場合の冷媒の流れについて図１を参照して説明する。
　圧縮機１１から吐出した冷媒は、四方弁１２を介して室外側熱交換器１３に流入し、室外側熱交換器１３において室外空気と熱交換する。室外側熱交換器１３において室外空気と熱交換した冷媒は、過冷却熱交換器１４において過冷却された後に室内ユニット２０に流入する。この際、冷媒の一部は室外側膨張弁１５を介して過冷却熱交換器１４に流れ、その後アキュムレータ１８に流入する。 Next, as an operation example of the air-conditioning apparatus 1 according to Embodiment 1, the refrigerant flow in the cooling operation will be described with reference to FIG.
The refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 13 through the four-way valve 12 and exchanges heat with outdoor air in the outdoor heat exchanger 13. The refrigerant that has exchanged heat with outdoor air in the outdoor heat exchanger 13 is subcooled in the supercooling heat exchanger 14 and then flows into the indoor unit 20. At this time, a part of the refrigerant flows into the supercooling heat exchanger 14 via the outdoor expansion valve 15 and then flows into the accumulator 18.
　室内ユニット２０に流入した冷媒は、室内絞り装置２１で減圧された後、室内側熱交換器２２に流入し、室内側熱交換器２２において室内空気と熱交換して室内空気を冷房する。その後、室内側熱交換器２２から流出した冷媒は、室外ユニット１０の四方弁１２を介してアキュムレータ１８に貯留され、アキュムレータ１８に貯留された冷媒が再び圧縮機１１に吸入される。 The refrigerant that has flowed into the indoor unit 20 is depressurized by the indoor expansion device 21, and then flows into the indoor heat exchanger 22, where it heat-exchanges with the indoor air to cool the indoor air. Thereafter, the refrigerant flowing out of the indoor heat exchanger 22 is stored in the accumulator 18 via the four-way valve 12 of the outdoor unit 10, and the refrigerant stored in the accumulator 18 is again sucked into the compressor 11.
　図２は、本発明の実施の形態１に係る空気調和装置１の室内ユニット２０の内部を示す斜視図である。なお、図２中の矢印は、風の流れを示している。
　図２に示すように、室内ユニット２０は、下部に吸込口（図示せず）、上部に吹出口２５が形成された筐体２６を有し、筐体２６の内部には、室内側熱交換器２２、室内ファン２３、室内ファン２３を駆動するモータ２４、および、制御装置５０が収容されている。室内側熱交換器２２の上方には、室内ファン２３およびモータ２４が配置されており、室内側熱交換器２２の下方には、制御装置５０が配置されている。 FIG. 2 is a perspective view showing the inside of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention. In addition, the arrow in FIG. 2 has shown the flow of the wind.
As shown in FIG. 2, the indoor unit 20 has a housing 26 having a suction port (not shown) in the lower portion and an air outlet 25 formed in the upper portion. The device 22, the indoor fan 23, the motor 24 for driving the indoor fan 23, and the control device 50 are accommodated. An indoor fan 23 and a motor 24 are disposed above the indoor heat exchanger 22, and a control device 50 is disposed below the indoor heat exchanger 22.
　室内ファン２３は、例えばシロッコファンで構成されており、モータ２４の駆動により回転駆動するものであり、この回転駆動により、筐体２６の内部において室内側熱交換器２２の下方の吸込口から上方の吹出口２５に向かう空気流を形成させる。そして、吹出口２５から吹き出した空気は、直吹きまたはダクト接続により室内負荷側に供給される。なお、この室内ファン２３の動作は、制御装置５０により制御される。 The indoor fan 23 is composed of, for example, a sirocco fan, and is rotationally driven by driving of a motor 24. By this rotational driving, the indoor fan 23 is moved upward from a suction port below the indoor heat exchanger 22 inside. An air flow toward the air outlet 25 is formed. And the air blown out from the blower outlet 25 is supplied to the indoor load side by direct blowing or duct connection. The operation of the indoor fan 23 is controlled by the control device 50.
　図３は、本発明の実施の形態１に係る空気調和装置１の制御装置５０およびリモコン６０の機能ブロック図である。
　図３に示すように、制御装置５０は、回転制御部５１、電流検知部５２、風量算出部５３、判定部５４、および、通信部５５を備えており、回転数Ｎと運転電流値Ｉとに基づいて室内ファン２３の動作を制御するものである。 FIG. 3 is a functional block diagram of control device 50 and remote control 60 of air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
As shown in FIG. 3, the control device 50 includes a rotation control unit 51, a current detection unit 52, an air volume calculation unit 53, a determination unit 54, and a communication unit 55. The operation of the indoor fan 23 is controlled based on the above.
　また、制御装置５０は、例えば、専用のハードウェア、またはメモリに格納されるプログラムを実行するＣＰＵ（Central Processing Unit、中央処理装置、処理装置、演算装置、マイクロプロセッサ、マイクロコンピュータ、プロセッサともいう）で構成されている。 The control device 50 is, for example, dedicated hardware or a CPU that executes a program stored in a memory (also referred to as a central processing unit, a central processing unit, a processing unit, a processing unit, a microprocessor, a microcomputer, or a processor). It consists of
　回転制御部５１は、モータ２４をインバータ駆動することによって室内ファン２３の回転数を制御するものであり、インバータ駆動の場合、リモコン６０により設定された回転数Ｎとなるように、室内ファン２３の回転数Ｎを制御する。 The rotation control unit 51 controls the rotation speed of the indoor fan 23 by driving the motor 24 with an inverter. In the case of inverter driving, the rotation control unit 51 controls the rotation of the indoor fan 23 so that the rotation speed N is set by the remote controller 60. The rotation speed N is controlled.
　電流検知部５２は、モータ２４に供給される運転電流値Ｉを検知するものである。回転制御部５１は、上述の通り、基本的にはリモコン６０により設定された回転数Ｎとなるように、室内ファン２３の回転数Ｎを制御する。しかし、電流検知部５２が検知した運転電流値Ｉが、記憶部（図示せず）などにあらかじめ設定された失速防止作動レベル電流値Ｉｓよりも大きくなった場合、回転制御部５１は、失速防止作動レベル電流値Ｉｓよりも小さくなるように、室内ファン２３の回転数Ｎを制御する。つまり、回転制御部５１は、室内ファン２３の回転数Ｎを減少させる。 The current detector 52 detects the operating current value I supplied to the motor 24. As described above, the rotation control unit 51 basically controls the rotation speed N of the indoor fan 23 so that the rotation speed N is set by the remote controller 60. However, when the operation current value I detected by the current detection unit 52 becomes larger than the stall prevention operation level current value Is preset in the storage unit (not shown) or the like, the rotation control unit 51 prevents the stall prevention. The rotational speed N of the indoor fan 23 is controlled so as to be smaller than the operation level current value Is. That is, the rotation control unit 51 decreases the rotation speed N of the indoor fan 23.
　風量算出部５３は、電流検知部５２が検知した運転電流値Ｉの値と回転制御部５１が制御した室内ファン２３の回転数Ｎとから、室内ファン２３から送風される風量Ｑを算出するものである。すなわち、上述の通りモータ２４がインバータ駆動される場合、運転電流値Ｉ、回転数Ｎ、および、風量Ｑは所定の関係を有している。風量算出部５３には、室内ファン２３の機種などに応じた運転電流値Ｉ、回転数Ｎ、および、風量Ｑの関係が記憶されており、その関係に基づいて、運転電流値Ｉと回転数Ｎとから風量Ｑを算出する。 The air volume calculation unit 53 calculates the air volume Q blown from the indoor fan 23 from the value of the operating current value I detected by the current detection unit 52 and the rotation speed N of the indoor fan 23 controlled by the rotation control unit 51. It is. That is, when the motor 24 is inverter-driven as described above, the operating current value I, the rotational speed N, and the air volume Q have a predetermined relationship. The air volume calculation unit 53 stores the relationship between the operating current value I, the rotational speed N, and the air volume Q according to the model of the indoor fan 23. Based on the relationship, the operating current value I and the rotational speed are stored. The air volume Q is calculated from N.
　判定部５４は、運転電流値Ｉおよび回転数Ｎに応じて、室内ユニット２０を制御するものである。なお、本実施の形態１では、モータ２４の過電流保護のため、運転電流値Ｉが異常停止電流値を超えた場合、室内ユニット２０の運転が異常停止するようになっている。ここで、制御装置５０は、異常停止電流値より低いレベルに失速防止作動レベル電流値Ｉｓを設定することで、何らかの原因で運転電流値Ｉが上昇した場合でも、室内ファン２３の回転数Ｎを減少させて、室内ユニットの運転電流値Ｉを異常停止電流値以下に抑制し、室内ユニット２０が異常停止するのを回避する制御を有している。なお、失速防止作動レベル電流値Ｉｓは、室内ユニット２０が最大負荷で使用されない場合の、最大電流値である。 The determination unit 54 controls the indoor unit 20 according to the operating current value I and the rotational speed N. In the first embodiment, for overcurrent protection of the motor 24, when the operating current value I exceeds the abnormal stop current value, the operation of the indoor unit 20 is stopped abnormally. Here, the control device 50 sets the stall prevention operation level current value Is to a level lower than the abnormal stop current value, so that the rotational speed N of the indoor fan 23 can be set even if the operating current value I increases for some reason. It has control which makes it decrease and suppresses the operating current value I of an indoor unit below an abnormal stop current value, and prevents the indoor unit 20 from stopping abnormally. The stall prevention operation level current value Is is a maximum current value when the indoor unit 20 is not used at the maximum load.
　通信部５５は、リモコン６０との間で室内ファン２３の回転数Ｎなどの情報の送受信を行うものである。 The communication unit 55 transmits and receives information such as the rotation speed N of the indoor fan 23 to and from the remote controller 60.
　リモコン６０は、操作部６１、リモコン側通信部６２、および、表示部６３を備えており、ユーザーから受け付けた情報を制御装置５０に送信するものである。 The remote controller 60 includes an operation unit 61, a remote control side communication unit 62, and a display unit 63, and transmits information received from the user to the control device 50.
　操作部６１は、例えばボタンで構成されており、ユーザーから情報を受け付けるものである。リモコン側通信部６２は、通信部５５との間でユーザーから受け付けた情報などの送受信を行うものである。表示部６３は、通信部５５から受信した情報に基づいて室内ユニット２０の稼働状況を表示してユーザーに知らせるものである。 The operation unit 61 is composed of buttons, for example, and receives information from the user. The remote controller side communication unit 62 transmits and receives information received from the user to and from the communication unit 55. The display unit 63 displays the operating status of the indoor unit 20 based on the information received from the communication unit 55 and notifies the user.
　図４は、本発明の実施の形態１に係る空気調和装置１の室内ファン２３の風量－静圧特性の一例を示す図である。なお、図４において、横軸は室内ファン２３から送風される風量を、縦軸は全静圧をそれぞれ示している。また、図４は、回転数Ｎ＝Ｎ１～Ｎ７での室内ファン２３の運転可能範囲を示している。また、図４に示すように、室内ファン２３の運転可能な風量範囲は、Ｑ＝７０～１１０［ｍ３／ｍｉｎ］であり、室内ファン２３の運転可能な静圧範囲は、全静圧でＰ＝３９０～１２４０［Ｐａ］である。 FIG. 4 is a diagram showing an example of the air volume-static pressure characteristics of the indoor fan 23 of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention. In FIG. 4, the horizontal axis indicates the amount of air blown from the indoor fan 23, and the vertical axis indicates the total static pressure. FIG. 4 shows the operable range of the indoor fan 23 at the rotation speed N = N1 to N7. As shown in FIG. 4, the air volume range in which the indoor fan 23 can be operated is Q = 70 to 110 [m 3 / min], and the static pressure range in which the indoor fan 23 can be operated is the total static pressure. P = 390 to 1240 [Pa].
　図４に示すように、室内ファン２３の運転可能範囲での運転電流値Ｉは、風量と静圧とに対してＩ＝Ｉ１～Ｉ５の関係があるため、回転数Ｎおよび運転電流値Ｉが分かると、風量Ｑを算出することが可能となる。例えば、回転数Ｎ＝Ｎ２で、運転電流値Ｉ＝Ｉ１の場合、風量Ｑ＝１１０［ｍ３／ｍｉｎ］である。 As shown in FIG. 4, since the operating current value I in the operable range of the indoor fan 23 has a relationship of I = I1 to I5 with respect to the air volume and the static pressure, the rotational speed N and the operating current value I are If it is understood, the air volume Q can be calculated. For example, when the rotational speed N = N2 and the operating current value I = I1, the air volume Q = 110 [m 3 / min].
　また、設定可能な室内ファン２３の回転数Ｎは、室内ユニット２０の機種によって決まっており、本実施の形態１では、回転制御部５１は、室内ファン２３の回転数Ｎを、最大回転数であるＮ１から最小回転数であるＮ７まで設定することができるようになっている。 The settable rotation speed N of the indoor fan 23 is determined by the model of the indoor unit 20, and in the first embodiment, the rotation control unit 51 sets the rotation speed N of the indoor fan 23 to the maximum rotation speed. It is possible to set from a certain N1 to a minimum rotational speed N7.
　また、回転制御部５１が回転数Ｎ＝Ｎ１で室内ファン２３を運転しているとき、何らかの原因で運転電流値Ｉ＝Ｉａとなるまで上昇し、失速防止作動レベル電流値Ｉｓを超えてしまった場合は、室内ファン２３の回転数ＮをＮ２、Ｎ３と減少させることによって、運転電流値Ｉを失速防止作動レベル電流値Ｉｓ以下に減少させることができる。 Further, when the rotation control unit 51 is operating the indoor fan 23 at the rotation speed N = N1, it rises for some reason until the operation current value I = Ia, and exceeds the stall prevention operation level current value Is. In this case, the operating current value I can be reduced below the stall prevention operation level current value Is by reducing the rotational speed N of the indoor fan 23 to N2 and N3.
　なお、回転制御部５１が回転数Ｎを最小回転数であるＮ７まで減少させても運転電流値Ｉが上昇し続け、失速防止作動レベル電流値Ｉｓを超えてしまった場合は、判定部５４は、その後運転電流値Ｉが異常停止電流値を超えることを想定して室内ユニット２０を異常停止させる。 Even if the rotation control unit 51 reduces the rotation speed N to the minimum rotation speed N7, if the operating current value I continues to increase and exceeds the stall prevention operation level current value Is, the determination unit 54 Thereafter, the indoor unit 20 is abnormally stopped on the assumption that the operating current value I exceeds the abnormal stop current value.
　図５は、本発明の実施の形態１に係る空気調和装置１の室内ユニット２０の制御を示すフローチャートである。
　次に、本実施の形態１に係る空気調和装置１の室内ユニット２０の制御について、図５を参照して説明する。
　まず、回転制御部５１は、初期回転数Ｎ０で室内ファン２３の運転を開始する。運転開始後、電流検知部５２は、一定時間（例えば３０秒）毎に運転電流値Ｉをサンプリングする。そして、判定部５４は、運転電流値Ｉが失速防止作動レベル電流値Ｉｓを超えているかどうかを判定する（ステップＳ１０１）。 FIG. 5 is a flowchart showing control of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
Next, control of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 1 will be described with reference to FIG.
First, the rotation control unit 51 starts the operation of the indoor fan 23 at the initial rotation number N0. After the operation is started, the current detection unit 52 samples the operation current value I every predetermined time (for example, 30 seconds). Then, the determination unit 54 determines whether or not the operating current value I exceeds the stall prevention operation level current value Is (step S101).
　判定部５４は、運転電流値Ｉが失速防止作動レベル電流値Ｉｓを超えていると判定した場合（ステップＳ１０１のＹｅｓ）、ステップＳ１０２に進む。一方、判定部５４は、運転電流値Ｉが失速防止作動レベル電流値Ｉｓを超えていないと判定した場合（ステップＳ１０１のＮｏ）、ステップＳ１０５に進む。 If the determination unit 54 determines that the operating current value I exceeds the stall prevention operation level current value Is (Yes in step S101), the process proceeds to step S102. On the other hand, when the determination unit 54 determines that the operating current value I does not exceed the stall prevention operation level current value Is (No in step S101), the process proceeds to step S105.
　ステップＳ１０２において、判定部５４は、室内ファン２３の回転数Ｎが最小回転数Ｎｍｉｎ（Ｎ７）であるかどうかを判定する。判定部５４は、室内ファン２３の回転数Ｎが最小回転数Ｎｍｉｎであると判定した場合（ステップＳ１０２のＹｅｓ）、室内ユニット２０を異常停止させ（ステップＳ１０３）、ステップＳ１０１に戻る。一方、判定部５４は、室内ファン２３の回転数Ｎが最小回転数Ｎｍｉｎでないと判定した場合（ステップＳ１０２のＮｏ）、回転制御部５１は、現在よりも室内ファン２３の回転数Ｎを減少させて室内ファン２３を運転し（ステップＳ１０４）、ステップＳ１０１に戻る。例えば、回転制御部５１は、現在の室内ファン２３の回転数ＮがＮ１に設定されている場合、回転数ＮをＮ２に設定して室内ファン２３を運転する。 In step S102, the determination unit 54 determines whether or not the rotation speed N of the indoor fan 23 is the minimum rotation speed Nmin (N7). If the determination unit 54 determines that the rotation speed N of the indoor fan 23 is the minimum rotation speed Nmin (Yes in step S102), the determination unit 54 abnormally stops the indoor unit 20 (step S103), and returns to step S101. On the other hand, when the determination unit 54 determines that the rotation speed N of the indoor fan 23 is not the minimum rotation speed Nmin (No in step S102), the rotation control unit 51 decreases the rotation speed N of the indoor fan 23 from the current level. Then, the indoor fan 23 is operated (step S104), and the process returns to step S101. For example, when the current rotation speed N of the indoor fan 23 is set to N1, the rotation control unit 51 sets the rotation speed N to N2 and operates the indoor fan 23.
　ステップＳ１０５において、判定部５４は、室内ファン２３の回転数Ｎが初期回転数Ｎ０であるかどうかを判定する。判定部５４は、室内ファン２３の回転数Ｎが初期回転数Ｎ０であると判定した場合（ステップＳ１０５のＹｅｓ）、回転制御部５１は、初期回転数Ｎ０で室内ファン２３の運転を継続し（ステップＳ１０６）、ステップＳ１０１に戻る。一方、判定部５４は、室内ファン２３の回転数Ｎが初期回転数Ｎ０でないと判定した場合（ステップＳ１０５のＮｏ）、ステップＳ１０７に進む。 In step S105, the determination unit 54 determines whether or not the rotational speed N of the indoor fan 23 is the initial rotational speed N0. When the determination unit 54 determines that the rotation speed N of the indoor fan 23 is the initial rotation speed N0 (Yes in step S105), the rotation control unit 51 continues the operation of the indoor fan 23 at the initial rotation speed N0 ( Step S106) and return to Step S101. On the other hand, if the determination unit 54 determines that the rotation speed N of the indoor fan 23 is not the initial rotation speed N0 (No in step S105), the process proceeds to step S107.
　ステップＳ１０７において、判定部５４は、室内ファン２３の回転数Ｎが最大回転数Ｎｍａｘ（Ｎ１）であるかどうかを判定する。判定部５４は、室内ファン２３の回転数Ｎが最大回転数Ｎｍａｘであると判定した場合（ステップＳ１０７のＹｅｓ）、ステップＳ１０１に戻る。一方、判定部５４は、室内ファン２３の回転数Ｎが最大回転数Ｎｍａｘでないと判定した場合（ステップＳ１０７のＮｏ）、回転制御部５１は、現在よりも室内ファン２３の回転数Ｎを増加させて室内ファン２３を運転し（ステップＳ１０８）、ステップＳ１０１に戻る。例えば、回転制御部５１は、現在の室内ファン２３の回転数ＮがＮ７に設定されている場合、回転数ＮをＮ６に設定して室内ファン２３を運転する。 In step S107, the determination unit 54 determines whether or not the rotation speed N of the indoor fan 23 is the maximum rotation speed Nmax (N1). If the determination unit 54 determines that the rotation speed N of the indoor fan 23 is the maximum rotation speed Nmax (Yes in step S107), the determination unit 54 returns to step S101. On the other hand, when the determination unit 54 determines that the rotation speed N of the indoor fan 23 is not the maximum rotation speed Nmax (No in step S107), the rotation control unit 51 increases the rotation speed N of the indoor fan 23 more than the current time. Then, the indoor fan 23 is operated (step S108), and the process returns to step S101. For example, when the current rotation speed N of the indoor fan 23 is set to N7, the rotation control unit 51 operates the indoor fan 23 with the rotation speed N set to N6.
　以上、本実施の形態１に係る空気調和装置１は、室外ユニット１０と室内ユニット２０とを備え、室内ユニット２０は、空気と冷媒との間で熱交換を行う室内側熱交換器２２と、室内側熱交換器２２に送風する室内ファン２３と、室内ユニット２０を制御する制御装置５０と、を備え、制御装置５０は、室内ファン２３の回転数を制御する回転制御部５１と、室内ファン２３の運転電流値を検知する電流検知部５２と、電流検知部５２が検知した運転電流値が失速防止作動レベル電流値Ｉｓを超えているかどうかを判定する判定部５４と、を備え、失速防止作動レベル電流値Ｉｓは、室内ユニット２０が異常停止する異常停止電流値より低いレベルに設定されており、回転制御部５１は、判定部５４が、運転電流値が失速防止作動レベル電流値Ｉｓを超えていると判定した場合、室内ファン２３の回転数を減少させるものである。 As described above, the air-conditioning apparatus 1 according to Embodiment 1 includes the outdoor unit 10 and the indoor unit 20, and the indoor unit 20 includes the indoor-side heat exchanger 22 that performs heat exchange between the air and the refrigerant, The indoor fan 23 that blows air to the indoor heat exchanger 22 and a control device 50 that controls the indoor unit 20 are provided. The control device 50 includes a rotation control unit 51 that controls the rotation speed of the indoor fan 23, and an indoor fan. A current detection unit 52 that detects the operation current value of 23, and a determination unit 54 that determines whether or not the operation current value detected by the current detection unit 52 exceeds the stall prevention operation level current value Is. The operation level current value Is is set to a level lower than the abnormal stop current value at which the indoor unit 20 abnormally stops. The rotation control unit 51 determines that the operation unit current has a stall prevention operation level voltage. If it is determined that exceeds the value it Is, is intended to reduce the rotation speed of the indoor fan 23.
　本実施の形態１に係る空気調和装置１によれば、室内ユニット２０が異常停止する異常停止電流値より低いレベルに失速防止作動レベル電流値Ｉｓを設定し、運転電流値Ｉが上昇して失速防止作動レベル電流値Ｉｓを超えた場合、室内ファン２３の回転数Ｎを減少させる。そうすることにより、運転電流値Ｉを減少させて、室内ユニット２０が即異常停止するのを回避することができる。つまり、運転電流値Ｉの上昇を抑制して室内ユニット２０の運転を継続させることができる。 According to the air conditioner 1 according to the first embodiment, the stall prevention operation level current value Is is set to a level lower than the abnormal stop current value at which the indoor unit 20 stops abnormally, and the operating current value I increases to cause the stall. When the prevention operation level current value Is is exceeded, the rotational speed N of the indoor fan 23 is decreased. By doing so, it is possible to reduce the operating current value I and prevent the indoor unit 20 from immediately stopping abnormally. That is, the operation of the indoor unit 20 can be continued while suppressing an increase in the operating current value I.
　実施の形態２．
　以下、本発明の実施の形態２について説明するが、実施の形態１と重複するものについては説明を省略し、実施の形態１と同じ部分または相当する部分には同じ符号を付す。 Embodiment 2. FIG.
Hereinafter, Embodiment 2 of the present invention will be described, but the description overlapping with Embodiment 1 will be omitted, and the same reference numerals will be given to the same or corresponding parts as those in Embodiment 1.
　実施の形態１に係る空気調和装置１では、室内ユニット２０に電圧変動、静圧変化など何らかの異常が起きている場合、室内ファン２３の回転数Ｎが最小回転数でも運転電流値Ｉが失速防止作動レベル電流値Ｉｓを超えてしまい、室内ユニット２０が異常停止する。そして、このとき初めてユーザーが室内ユニット２０の異常に気づくことになる。そのため、ユーザーは、室内ユニット２０が異常停止するまでその異常に気づくことができない。 In the air conditioner 1 according to Embodiment 1, when any abnormality such as a voltage fluctuation or a static pressure change occurs in the indoor unit 20, the operating current value I prevents the stall even if the rotational speed N of the indoor fan 23 is the minimum rotational speed. The operation level current value Is is exceeded, and the indoor unit 20 is abnormally stopped. At this time, the user notices an abnormality in the indoor unit 20 for the first time. Therefore, the user cannot notice the abnormality until the indoor unit 20 abnormally stops.
　そこで、本実施の形態２に係る空気調和装置１では、室内ユニット２０に電圧変動、静圧変化など何らかの異常が起きている場合、そのことを、室内ユニット２０が異常停止する前にユーザーに気づかせることができるようにするものである。 Therefore, in the air conditioner 1 according to the second embodiment, when any abnormality such as voltage fluctuation or static pressure change occurs in the indoor unit 20, the user notices that before the indoor unit 20 abnormally stops. It is to be able to let you.
　図６は、本発明の実施の形態２に係る空気調和装置１の室内ユニット２０の制御を示すフローチャートである。
　次に、本実施の形態２に係る空気調和装置１の室内ユニット２０の制御について、図６を参照して説明する。
　まず、回転制御部５１は、初期回転数Ｎ０で室内ファン２３の運転を開始する。運転開始後、電流検知部５２は、一定時間（例えば３０秒）毎に運転電流値Ｉをサンプリングする。そして、判定部５４は、運転電流値Ｉが失速防止作動レベル電流値Ｉｓを超えているかどうかを判定する（ステップＳ１０１）。 FIG. 6 is a flowchart showing control of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 2 of the present invention.
Next, control of the indoor unit 20 of the air-conditioning apparatus 1 according to Embodiment 2 will be described with reference to FIG.
First, the rotation control unit 51 starts the operation of the indoor fan 23 at the initial rotation number N0. After the operation is started, the current detection unit 52 samples the operation current value I every predetermined time (for example, 30 seconds). Then, the determination unit 54 determines whether or not the operating current value I exceeds the stall prevention operation level current value Is (step S101).
　判定部５４は、運転電流値Ｉが失速防止作動レベル電流値Ｉｓを超えていると判定した場合（ステップＳ１０１のＹｅｓ）、ステップＳ１０２に進む。一方、判定部５４は、運転電流値Ｉが失速防止作動レベル電流値Ｉｓを超えていないと判定した場合（ステップＳ１０１のＮｏ）、ステップＳ１０５に進む。なお、ステップＳ１０５～ステップＳ１０８については実施の形態１と同じ処理であるため、説明を省略する。 If the determination unit 54 determines that the operating current value I exceeds the stall prevention operation level current value Is (Yes in step S101), the process proceeds to step S102. On the other hand, when the determination unit 54 determines that the operating current value I does not exceed the stall prevention operation level current value Is (No in step S101), the process proceeds to step S105. Steps S105 to S108 are the same as those in the first embodiment, and thus description thereof is omitted.
　ステップＳ１０２において、判定部５４は、室内ファン２３の回転数Ｎが最小回転数Ｎｍｉｎ（Ｎ７）であるかどうかを判定する。判定部５４は、室内ファン２３の回転数Ｎが最小回転数Ｎｍｉｎであると判定した場合（ステップＳ１０２のＹｅｓ）、室内ユニット２０を異常停止させ（ステップＳ１０３）、ステップＳ１０１に戻る。一方、判定部５４は、室内ファン２３の回転数Ｎが最小回転数Ｎｍｉｎでないと判定した場合（ステップＳ１０２のＮｏ）、回転制御部５１は、現在よりも室内ファン２３の回転数Ｎを減少させて室内ファン２３を運転し（ステップＳ１０４）、ステップＳ２０１に進む。 In step S102, the determination unit 54 determines whether or not the rotation speed N of the indoor fan 23 is the minimum rotation speed Nmin (N7). If the determination unit 54 determines that the rotation speed N of the indoor fan 23 is the minimum rotation speed Nmin (Yes in step S102), the determination unit 54 abnormally stops the indoor unit 20 (step S103), and returns to step S101. On the other hand, when the determination unit 54 determines that the rotation speed N of the indoor fan 23 is not the minimum rotation speed Nmin (No in step S102), the rotation control unit 51 decreases the rotation speed N of the indoor fan 23 from the current level. Then, the indoor fan 23 is operated (step S104), and the process proceeds to step S201.
　ステップＳ２０１において、回転制御部５１は、現在よりも室内ファン２３の回転数Ｎを減少させたので、回転数ダウン回数を１増やして、ステップＳ２０２に進む。なお、初期状態の回転数ダウン回数は０である。 In step S201, the rotation control unit 51 has decreased the number of rotations N of the indoor fan 23 from the current time, so the number of rotations is decreased by 1, and the process proceeds to step S202. It should be noted that the number of revolutions in the initial state is zero.
　ステップＳ２０２において、判定部５４は、回転数ダウン回数が１回であるかどうかを判定する。判定部５４は、回転数ダウン回数が１回でないと判定した場合（ステップＳ２０２のＮｏ）、ステップＳ２０４に進む。一方、判定部５４は、回転数ダウン回数が１回であると判定した場合（ステップＳ２０２のＹｅｓ）、回転制御部５１は、タイマＴのカウントを開始し（ステップＳ２０３）、ステップＳ２０４に進む。 In step S202, the determination unit 54 determines whether or not the number of rotations is reduced once. If the determination unit 54 determines that the number of revolutions is not one (No in step S202), the determination unit 54 proceeds to step S204. On the other hand, when the determination unit 54 determines that the number of rotations is decreased (Yes in step S202), the rotation control unit 51 starts counting the timer T (step S203), and proceeds to step S204.
　ステップＳ２０４において、判定部５４は、タイマＴがΔＴ以内に回転数ダウン回数が基準回数（例えば３回）に到達したかどうかを判定する。判定部５４は、タイマＴがΔＴ以内に回転数ダウン回数が基準回数に到達していない、つまり基準回数未満であると判定した場合（ステップＳ２０４のＮｏ）、ステップＳ１０１に戻る。一方、判定部５４は、タイマＴがΔＴ以内に回転数ダウン回数が基準回数に到達したと判定した場合（ステップＳ２０４のＹｅｓ）、通信部５５は、リモコン６０に異常を報知させ（ステップＳ２０５）、ステップＳ１０１に戻る。 In step S204, the determination unit 54 determines whether or not the timer T has reached the reference number of times (for example, 3 times) within ΔT. If the timer T determines that the number of rotations down has not reached the reference number within ΔT, that is, less than the reference number (No in step S204), the determination unit 54 returns to step S101. On the other hand, when the determination unit 54 determines that the number of rotations down reaches the reference number within ΔT (Yes in step S204), the communication unit 55 notifies the remote controller 60 of the abnormality (step S205). Return to step S101.
　ここで、回転数ダウン回数は、通信部５５がリモコン６０に異常を報知させた場合、または、室内ユニット２０が停止した場合にリセットされる。また、タイマＴは、カウントが開始してΔＴが経過した場合、または、通信部５５がリモコン６０に異常を報知させた場合、または、室内ユニット２０が停止した場合にリセットされる。 Here, the number of rotation speed reductions is reset when the communication unit 55 notifies the remote controller 60 of an abnormality or when the indoor unit 20 stops. In addition, the timer T is reset when ΔT has elapsed since the count started, when the communication unit 55 notifies the remote controller 60 of an abnormality, or when the indoor unit 20 is stopped.
　なお、リモコン６０による異常の報知方法としては、例えば表示部６３に異常である旨を表示して報知する。また、その他の報知方法として、リモコン６０が例えばブザーなどの音発生手段を備え、音発生手段で音を発生させて異常を報知してもよいし、リモコン６０が例えばＬＥＤなどの発光手段を備え、発光手段を点滅させて異常を報知してもよい。 In addition, as a method for notifying abnormality by the remote controller 60, for example, the display unit 63 is notified of the abnormality. As another notification method, the remote controller 60 may be provided with sound generating means such as a buzzer, and a sound may be generated by the sound generating means to notify the abnormality, or the remote controller 60 may be provided with light emitting means such as an LED. The abnormality may be notified by blinking the light emitting means.
　また、上記の基準回数について、回転数ダウンが起きた場合、異常によるものではなく運転の過程で一時的に起きたような場合に、判定部５４が、異常が起きていると判定しない回数、かつ、異常が起きている場合に、通信部５５がそのことをユーザーにできるだけ早く報知できる回数として、例えば３回としているが、それに限定されない。 In addition, with respect to the above-mentioned reference number of times, when the rotation speed is reduced, the number of times that the determination unit 54 does not determine that an abnormality has occurred when it occurs temporarily in the course of operation, not due to an abnormality, In addition, when the abnormality occurs, the number of times that the communication unit 55 can notify the user as soon as possible is, for example, three times, but is not limited thereto.
　また、上記のΔＴについて、回転数ダウンが異常によるものではなく運転の過程で一時的に起きたような場合が複数回発生した場合でも、判定部５４が、異常が起きていると判定しないように設定された時間であり、基準回数に応じて変わる。 In addition, with regard to the above ΔT, even if the case where the rotation speed reduction is not caused by an abnormality but occurs temporarily in the course of operation occurs multiple times, the determination unit 54 does not determine that an abnormality has occurred. The time is set according to the number of times of reference.
　以上、本実施の形態２に係る空気調和装置１は、制御装置５０は、リモコン６０との間で情報の送受信を行う通信部５５を備え、回転制御部５１は、室内ファン２３の回転数を減少させた場合、回転数ダウン回数をカウントし、判定部５４は、回転数ダウン回数が基準回数に到達したと判定した場合、通信部５５は、リモコン６０に異常を報知させるものである。 As described above, in the air conditioning apparatus 1 according to the second embodiment, the control device 50 includes the communication unit 55 that transmits and receives information to and from the remote controller 60, and the rotation control unit 51 determines the rotation speed of the indoor fan 23. If it is decreased, the number of rotations down is counted, and if the determination unit 54 determines that the number of rotations down has reached the reference number, the communication unit 55 notifies the remote controller 60 of the abnormality.
　本実施の形態２に係る空気調和装置１によれば、室内ファン２３の回転数を減少させながら室内ユニット２０の運転を継続させるが、回転数ダウン回数が基準回数に到達した場合、リモコン６０に異常を報知させる。そのため、室内ユニット２０に電圧変動、静圧変化など何らかの異常が起きている場合、そのことを、室内ユニット２０が異常停止する前にユーザーに気づかせることができる。 According to the air conditioner 1 according to the second embodiment, the operation of the indoor unit 20 is continued while reducing the rotation speed of the indoor fan 23. However, when the rotation speed down count reaches the reference count, the remote controller 60 Abnormality is notified. Therefore, when any abnormality such as voltage fluctuation or static pressure change occurs in the indoor unit 20, it can be noticed to the user before the indoor unit 20 abnormally stops.
　実施の形態３．
　以下、本発明の実施の形態３について説明するが、実施の形態１および２と重複するものについては説明を省略し、実施の形態１および２と同じ部分または相当する部分には同じ符号を付す。 Embodiment 3 FIG.
Hereinafter, Embodiment 3 of the present invention will be described, but the description overlapping with Embodiments 1 and 2 will be omitted, and the same or corresponding parts as those in Embodiments 1 and 2 will be denoted by the same reference numerals. .
　実施の形態１および２に係る空気調和装置１では、運転電流値Ｉが失速防止作動レベル電流値Ｉｓを超えた場合、その後運転電流値Ｉが異常停止電流値を超えることを想定して、室内ファン２３の回転数Ｎを減少させ、運転電流値Ｉの上昇を抑制している。しかし、室内ユニット２０の使用環境は様々であり、最大負荷で使用されない場合がある。例えば、室内ユニット２０の使用環境によっては、運転電流値ＩがＩ３までの運転範囲で問題ない場合がある。現状、室内ユニット２０の配線径は、運転可能範囲の最大電流をベースとして決定されており、室内ユニット２０が最大負荷で使用されない場合、配線径がオーバースペックとなり、工事費が余分にかかっている可能性がある。 In the air conditioner 1 according to Embodiments 1 and 2, when the operating current value I exceeds the stall prevention operation level current value Is, it is assumed that the operating current value I then exceeds the abnormal stop current value. The rotational speed N of the fan 23 is decreased, and the increase in the operating current value I is suppressed. However, the usage environment of the indoor unit 20 is various and may not be used at the maximum load. For example, depending on the usage environment of the indoor unit 20, there may be no problem in the operating range where the operating current value I is up to I3. At present, the wiring diameter of the indoor unit 20 is determined based on the maximum current within the operable range. When the indoor unit 20 is not used at the maximum load, the wiring diameter is over-specification, and the construction cost is excessive. there is a possibility.
　そこで、本実施の形態３に係る空気調和装置１では、リモコン６０から失速防止作動レベル電流値Ｉｓを設定することができるようになっており、室内ユニット２０の使用環境に応じてユーザーが失速防止作動レベル電流値Ｉｓを設定することができる。 Therefore, in the air conditioner 1 according to the third embodiment, the stall prevention operation level current value Is can be set from the remote controller 60, and the user can prevent stall according to the usage environment of the indoor unit 20. The operating level current value Is can be set.
　以上、本実施の形態３に係る空気調和装置１は、リモコン６０から失速防止作動レベル電流値Ｉｓの設定が可能である。 As described above, the air conditioning apparatus 1 according to the third embodiment can set the stall prevention operation level current value Is from the remote controller 60.
　本実施の形態３に係る空気調和装置１によれば、室内ユニット２０の使用環境に応じてユーザーが失速防止作動レベル電流値Ｉｓを設定することができるため、運転範囲に応じた室内ユニット２０の配線径を選定することができ、工事費を抑制することができる。 According to the air conditioner 1 according to the third embodiment, the user can set the stall prevention operation level current value Is according to the usage environment of the indoor unit 20, so that the indoor unit 20 according to the operation range can be set. The wire diameter can be selected, and construction costs can be reduced.
　なお、失速防止作動レベル電流値Ｉｓは、本発明の「基準電流値」に相当する。 The stall prevention operation level current value Is corresponds to the “reference current value” of the present invention.
　１　空気調和装置、１０　室外ユニット、１１　圧縮機、１２　四方弁、１３　室外側熱交換器、１４　過冷却熱交換器、１５　室外側膨張弁、１６　第一操作弁、１７　第二操作弁、１８　アキュムレータ、２０　室内ユニット、２１　室内絞り装置、２２　室内側熱交換器、２３　室内ファン、２４　モータ、２５　吹出口、２６　筐体、５０　制御装置、５１　回転制御部、５２　電流検知部、５３　風量算出部、５４　判定部、５５　通信部、６０　リモコン、６１　操作部、６２　リモコン側通信部、６３　表示部。 DESCRIPTION OF SYMBOLS 1 Air conditioner, 10 Outdoor unit, 11 Compressor, 12 Four-way valve, 13 Outdoor heat exchanger, 14 Supercooling heat exchanger, 15 Outdoor expansion valve, 16 First operation valve, 17 Second operation valve, 18 Accumulator, 20 indoor unit, 21 indoor throttle device, 22 indoor heat exchanger, 23 indoor fan, 24 motor, 25 outlet, 26 housing, 50 control device, 51 rotation control unit, 52 current detection unit, 53 air volume calculation Part, 54 determination part, 55 communication part, 60 remote control, 61 operation part, 62 remote control side communication part, 63 display part.

Claims (5)

  1. 　室外ユニットと室内ユニットとを備え、
    　前記室内ユニットは、
    　空気と冷媒との間で熱交換を行う室内側熱交換器と、
    　前記室内側熱交換器に送風する室内ファンと、
    　前記室内ユニットを制御する制御装置と、を備え、
    　前記制御装置は、
    　前記室内ファンの回転数を制御する回転制御部と、
    　前記室内ファンの運転電流値を検知する電流検知部と、
    　前記電流検知部が検知した前記運転電流値が基準電流値を超えているかどうかを判定する判定部と、を備え、
    　前記基準電流値は、前記室内ユニットが異常停止する異常停止電流値より低いレベルに設定されており、
    　前記回転制御部は、
    　前記判定部が、前記運転電流値が前記基準電流値を超えていると判定した場合、前記室内ファンの回転数を減少させる
    　空気調和装置。     An outdoor unit and an indoor unit,
    The indoor unit is
    An indoor heat exchanger that exchanges heat between air and refrigerant;
    An indoor fan for blowing air to the indoor heat exchanger;
    A control device for controlling the indoor unit,
    The control device includes:
    A rotation control unit for controlling the rotation speed of the indoor fan;
    A current detector for detecting an operating current value of the indoor fan;
    A determination unit that determines whether or not the operating current value detected by the current detection unit exceeds a reference current value;
    The reference current value is set to a level lower than an abnormal stop current value at which the indoor unit abnormally stops,
    The rotation control unit
    An air conditioner that reduces the rotational speed of the indoor fan when the determination unit determines that the operating current value exceeds the reference current value.
  2. 　前記室内ファンはインバータ駆動により回転駆動される
    　請求項１に記載の空気調和装置。     The air conditioner according to claim 1, wherein the indoor fan is rotationally driven by an inverter drive.
  3. 　前記制御装置との間で情報の送受信を行うリモコンを備えた
    　請求項１または２に記載の空気調和装置。     The air conditioning apparatus according to claim 1, further comprising a remote controller that transmits and receives information to and from the control device.
  4. 　前記制御装置は、前記リモコンとの間で情報の送受信を行う通信部を備え、
    　前記回転制御部は、
    　前記室内ファンの回転数を減少させた場合、回転数ダウン回数をカウントし、
    　前記判定部は、前記回転数ダウン回数が基準回数に到達したと判定した場合、前記通信部は、前記リモコンに異常を報知させる
    　請求項３に記載の空気調和装置。     The control device includes a communication unit that transmits and receives information to and from the remote control,
    The rotation control unit
    When the number of revolutions of the indoor fan is reduced, the number of revolutions is counted down,
    The air conditioning apparatus according to claim 3, wherein when the determination unit determines that the number of revolutions of the rotation speed has reached a reference number, the communication unit notifies the remote controller of the abnormality.
  5. 　前記リモコンから前記基準電流値の設定が可能である
    　請求項３または４に記載の空気調和装置。     The air conditioning apparatus according to claim 3 or 4, wherein the reference current value can be set from the remote controller.
PCT/JP2017/003751 2017-02-02 2017-02-02 Air conditioner WO2018142531A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010084968A (en) * 2008-09-30 2010-04-15 Mitsubishi Electric Corp Refrigerating cycle device
JP2013002719A (en) * 2011-06-15 2013-01-07 Mitsubishi Heavy Ind Ltd Air conditioner
WO2013031597A1 (en) * 2011-08-31 2013-03-07 三洋電機株式会社 Air-conditioning device and method for controlling air-conditioning device
JP2016070619A (en) * 2014-09-30 2016-05-09 三菱重工業株式会社 Outdoor unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010084968A (en) * 2008-09-30 2010-04-15 Mitsubishi Electric Corp Refrigerating cycle device
JP2013002719A (en) * 2011-06-15 2013-01-07 Mitsubishi Heavy Ind Ltd Air conditioner
WO2013031597A1 (en) * 2011-08-31 2013-03-07 三洋電機株式会社 Air-conditioning device and method for controlling air-conditioning device
JP2016070619A (en) * 2014-09-30 2016-05-09 三菱重工業株式会社 Outdoor unit

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