JPH11208238A - Vehicle air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the temperature difference between passages in an inside/ outside air dual flow mode by raising the temperature of the conditioned air flowing in the outside air passage. SOLUTION: In a second air passage 90, the conditioned air which has passed through an evaporator 12 is guided by a partition plate 30a and passes only a portion a (lower portion) of a heater core 13 disposed in the second air passage 90 as shown by an arrow A. For example, when a communicating passage 23 and a face opening portion 21 are both closed and a defroster opening portion 19 is open, the conditioned air which had passed through the heater core 13 returns towards the vehicle front as shown by the arrow A. Then, after the conditioned air passes through the remaining portion of the heater core exchanger, it is sent to the defroster opening portion 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an air-conditioning case in which a passage inside an air conditioning case is divided into a first air passage on the inside air side and a second air passage on the outside air side, so that the high temperature inside air warmed from the foot opening is formed. The present invention relates to a vehicle air conditioner capable of setting a so-called inside / outside air two-layer flow mode in which low-humidity outside air is blown out from a defroster opening while being recirculated and blown out.

[0002]

2. Description of the Related Art The present applicant has previously disclosed Japanese Patent Application No. 9-13 as an air conditioner for a vehicle which can set the above two-layer flow of inside / outside air.
No. 4022 was filed. In this device, the inside of the air-conditioning case is partitioned into two inside air passages and two outside air passages, and an evaporator as a cooling heat exchanger and a heater core as a heating heat exchanger straddle both passages. I have arranged it. In this device, the temperature control method of the air conditioner is of a so-called reheat type, which is performed by controlling the flow rate of hot water supplied to the heater core.

[0003] By setting the inside and outside air switched by the inside and outside air blowing unit to the inside and outside air two-layer flow mode, the inside air is introduced into the inside air passage and the outside air is introduced into the outside air passage. The heated inside air can be recirculated and blown out to the feet of the occupant to heat the passenger compartment, so that the temperature of the conditioned air in the passenger compartment increases, and the heating performance can be improved. At the same time, low-humidity outside air is introduced into the outside-air passage, and the outside air is blown out to the window glass, so that the anti-fog performance of the window glass can be secured.

[0004]

In the above-mentioned apparatus, when the inside / outside air two-layer flow mode is set, both low-temperature outside air in the outside air passage and high-temperature inside air in the inside air passage pass through the heater core. Although the air is heated, there is a problem that the temperature of the inside air passage is still higher than that of the outside air passage when comparing the temperature of the conditioned air in each passage.

Accordingly, an object of the present invention is to increase the temperature of the conditioned air flowing through the passage for outside air in the two-layer flow of inside and outside air to reduce the temperature difference between the passages. Another object of the present invention is to further increase the temperature of the conditioned air in the inside air passage.

[0006]

In order to achieve the above-mentioned object, the present invention comprises the following technical means. According to the first aspect of the invention, the conditioned air introduced into the first air passage (8, 80) passes through the heating heat exchanger (13) only once, and the second air Passage (9, 9
In (0), the conditioned air that has passed through the heating heat exchanger (13) passes through the heating heat exchanger (13) again and is blown to the defroster opening (19). I have.

As a result, the conditioned air in the first air passage is
The conditioned air in the second air passage passes through the heating heat exchanger once, and the conditioned air in the second air passage passes twice through the heating heat exchanger, so that the blow-out temperature of the conditioned air in the second air passage can be further increased. . As a result, the temperature difference between the conditioned air in the first air passage and the conditioned air in the second air passage can be reduced. According to the third aspect of the present invention, a face opening (21) for blowing conditioned air toward the upper body of the occupant is disposed on the second air passage (9, 90) side of the air conditioning case (11). The face opening (21) is characterized in that the face opening (21) is arranged at a position where the conditioned air that has passed through the heating heat exchanger (13) only once flows in.

Accordingly, the face opening is opened in the flow path until the conditioned air that has passed through the heater core once flows into the heater core again. Therefore, the face opening passes through the heater core only once. Conditioned air flows in. As a result, the amount of conditioned air blown to the face opening can be increased, and the cooling capacity can be improved.

According to the fourth aspect of the invention, in the first air passage (8, 80), the conditioned air that has passed through the heating heat exchanger (13) passes through the heating heat exchanger (13) again. And the air is blown to the foot opening (25). Accordingly, the temperature of the conditioned air in the first air passage passes through the heating heat exchanger twice, so that the temperature of the conditioned air can be higher than that in the case of passing once.

In the invention according to claim 6, the first air passage (8, 80) and the second air passage (9, 90) are arranged downstream of the heating heat exchanger (13) in the air. A first communication passage (23) for communication, a communication passage opening / closing means (50) for opening and closing the first communication passage (23), and a first air passage (8, 8);
0), a portion provided downstream of the cooling heat exchanger (12) in the air, before the conditioned air passes through the heating heat exchanger (13), and a U-turn and a heating heat exchanger ( 13) a second communication path (52) that communicates with the part after passing through;
A blowing mode door member (26) for opening and closing the foot opening (25) and the second communication path (52), and opening the first communication path (23) with the communication path opening / closing means (50); Open the foot opening (2) with the mode door member (26).
A communication mode in which 5) is closed and the second communication path (52) is opened is selectable.

Thus, a U-turn flow path for making U-turn of the conditioned air to pass through the heating heat exchanger twice and a normal flow path for making the U-turn pass through the heating heat exchanger only once without making a U-turn. Can switch. In the case of a normal flow path, the foot opening 25 is closed, but since the first communication path is opened by the communication path opening / closing means, the conditioned air in the first air path is supplied to the second air path. And the air can be blown to the outlet opening on the second air passage side.

Further, since the switching between the U-turn flow path and the normal flow path is performed by the blowing mode door member, it is not necessary to use a dedicated member. Claim 7
In the described invention, the heating heat exchanger (13) is configured as a one-way flow type in which hot water flows from the first air passage (8, 80) toward the second air passage (9, 90). It is characterized by.

According to this, since the heating heat exchanger is of a type in which the hot water flows in one direction (all passes), the hot water flow path has a low pressure loss and the width direction of the heating heat exchanger (the tube arrangement direction). There is an advantage that there is no difference in the blowing temperature. On the other hand, since the hot water flows in the heating heat exchanger in one direction, the outlet air temperature decreases at the hot water outlet side, that is, at the second air passage due to the lowering of the hot water temperature.

Therefore, when the heat exchanger for heating is arranged as in the invention of claim 7, the temperature of the conditioned air in the second air passage can be effectively increased. Note that the reference numerals in parentheses attached to the above-described units indicate the correspondence with specific units described in the embodiments described later.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment of the present invention shown in the drawings will be described below. FIG. 1 shows an embodiment of the present invention, and is applied to a low heat source vehicle in which hot water (engine cooling water) temperature is relatively low, such as a diesel engine vehicle.

The ventilation system of the air conditioner is roughly divided into two parts, a blower unit 1 and an air conditioning unit 100. The air-conditioning unit 100 is disposed at a substantially central portion in the vehicle left-right direction in the lower part of the instrument panel in the vehicle interior. On the other hand, the blower unit 1 is located in front of the air-conditioning unit 100 in the vehicle shown in FIG. The state arrange | positioned at the side is illustrated. That is, the layout is such that the air conditioning unit 100 is arranged in the vehicle interior, and the blower unit 1 is arranged at a position in front of the air conditioning unit 100 in the engine room.

The fan unit 1 may be arranged so as to be offset from the air conditioning unit 100 in the passenger compartment (on the side of the passenger seat). First, the blower unit 1 will be specifically described. First, second and second air blowers which introduce inside air (vehicle interior air) into the blower unit 1 will be described.
There are provided two inside air inlets 2 and 2a and one outside air inlet 3 for introducing outside air (outside air of the vehicle compartment). These inlets 2, 2a, 3 can be opened and closed by first and second two inside / outside air switching doors 4, 5, respectively.

The inside / outside air switching doors 4 and 5 are flat plates which are pivotally operated around the rotating shafts 4a and 5a, respectively. (Not shown) is connected to a manual operation mechanism for switching between inside and outside air (a mechanism using a lever and a dial), and is operated in conjunction with the inside or outside air switching door 4,
5 is operated in conjunction with an inside / outside air switching actuator mechanism using a servomotor.

The first (inside air) fan 6 for blowing the air introduced from the inlets 2, 2a, 3 and the second fan
(Outside air side) Fan 7 is arranged in blower unit 1. The fans 6 and 7 are composed of a well-known centrifugal multi-blade fan (sirocco fan), and are simultaneously driven to rotate by one common electric motor 7b. FIG. 1 shows a state of a two-layer flow of inside / outside air described later. The first inside / outside air switching door 4 opens the first inside air inlet 2 and closes the outside air passage 3 a from the outside air inlet 3. Therefore, the inside air is sucked into the suction port 6 a of the first (inside air) fan 6. On the other hand, since the second inside / outside air switching door 5 closes the second inside air introduction port 2a and opens the outside air passage 3b from the outside air introduction port 3, the suction port 7a of the second (outside air side) fan 7 is provided. Outside air is inhaled.

Therefore, in this state, the first fan 6
The inside air from the inside air inlet 2 is supplied to the first air passage (inside air passage).
8, the second fan 7 blows outside air from the outside air inlet 3 to a second air passage (outside air side passage) 9, and the first and second air passages 8, 9 Partitioned by a partition plate 10 disposed between the first fan 6 and the second fan 7. The partition plate 10 can be integrally formed with a resin scroll casing 10a that houses the fans 6 and 7.

In this embodiment, the outer diameter of the first fan 6 is made larger and the outer diameter of the second fan 7 is made smaller. This is to prevent the opening area of the suction port 7a from decreasing on the first fan 6 side due to the presence of the electric motor 7b. Next, 100 units of the air conditioning unit are
Evaporator inside (heat exchanger for air conditioning, heat exchanger for cooling)
12 and heater core (heat exchanger for air conditioning, heat exchanger for heating)
13 are both built-in types. The air-conditioning case 11 is made of a molded article of a resin having a certain degree of elasticity such as polypropylene and having excellent strength, and is made up of a plurality of divided cases. After storing the heat exchangers 12, 13 and devices such as doors to be described later in the plurality of divided cases, the plurality of divided cases are integrally connected by fastening means such as metal spring clips and screws. The air conditioning unit 100 is assembled.

In the air-conditioning case 11, an evaporator 12 is installed at the most forward part of the vehicle.
The evaporator 12 is arranged so as to traverse the entire area of the first and second air passages 80 and 90 in 1. As is well known, the evaporator 12 cools the conditioned air by absorbing the latent heat of evaporation of the refrigerant in the refrigeration cycle from the conditioned air. Here, as shown in FIG. 1, the evaporator 12 is installed in the air-conditioning case 11 in a thin form in the vehicle front-rear direction.

The air passage inside the air-conditioning case 11
From the upstream portion of the evaporator 12 to the downstream portion of the heater core 13, the partition plate 15a, 15b, 15c separates the first air passage (inside air passage) 80 on the lower side of the vehicle and the second air passage (outside air side passage) on the upper side of the vehicle. ) 90. The partition plates 15a to 15c are fixed partition members formed integrally with the air-conditioning case 11 by resin and extending substantially horizontally in the vehicle left-right direction.

The evaporator 12 is of a well-known lamination type, in which a number of flat tubes formed by laminating two thin metal plates made of aluminum or the like in the middle are laminated and arranged via corrugated fins and brazed integrally. Things. The heater core 13 is disposed adjacent to the evaporator 12 downstream of the air flow (rear side of the vehicle) at a predetermined interval. The heater core 13 reheats the cold air that has passed through the evaporator 12, in which high-temperature engine cooling water (warm water) flows, and heats the air using the cooling water as a heat source.

Like the evaporator 12, the heater core 13 has a thin shape in the front-rear direction of the vehicle.
It is installed in. More specifically, the heater core 13 of this example is disposed between the partition plates 15b and 15c so as to straddle both the first air passage 80 and the second air passage 90. Note that the heater core 13 is a well-known one, and is formed by laminating a large number of flat tubes formed by joining thin metal plates of aluminum or the like into a flat cross section by welding or the like with corrugated fins interposed therebetween and brazing integrally. .

In the heater core 13 of this embodiment, the hot water inlet side tank 13a is arranged on the lower first air passage 80 side, and the hot water outlet side tank 13b is connected to the upper second air passage 90.
It is located on the side. And these two tanks 13a, 13
A heat exchange core portion 13c composed of the flat tube and the corrugated fin is formed between the flat tubes b and b. Therefore, the heater core 13 is configured as a one-way flow type (all-pass type) in which hot water from the hot water inlet side tank 13a flows in one direction from below to above in the flat tube of the heat exchange core portion 13c.

A hot water valve 14 for adjusting the flow rate of hot water flowing into the heater core 13 is provided, and the temperature of the air blown into the vehicle cabin can be adjusted by adjusting the hot water flow rate of the hot water valve 14. That is, in the present embodiment, the hot water valve 14 constitutes a temperature adjusting means for adjusting the temperature of the air blown into the vehicle interior. Here, the configuration of the hot water valve 14 is as shown in FIG. 2, and the hot water valve 14 has a housing 14a made of resin. Inside the housing 14a, a rotary (resin) valve (not shown) having a cylindrical outer shape is arranged. In the housing 14a,
A pipe-shaped hot water inlet 14b and a hot water outlet 14c are formed.

A drive shaft (not shown) is formed at one end of the valve body in the direction of the rotation axis (the direction of the front and back of the paper) from the housing 14a. The drive shaft is provided with a link lever 60 made of resin. Is attached. A columnar pin 61 is integrally formed with the link lever 60, and the pin 61 is fitted in a link groove 63 of the link lever 62.

The link lever 62 is connected to an air temperature setting lever provided on an air conditioning operation panel (not shown). When the air temperature setting lever is operated, the link lever 62 rotates. When the link lever 62 rotates,
Accordingly, the link lever 61 rotates, so that the operation opening of the valve body changes, and the flow rate of the hot water supplied to the heater core 13 changes. In FIG. 2, COOL is an operation opening degree at which the valve element does not supply any hot water to the heater core 13, and HOT is an operation opening degree at which the valve element supplies the heater core 13 with the maximum flow rate of hot water. In this example, as shown in FIG. 2, the drive angle of the link lever 61 is 75 °, and the drive angle of the link lever 62 is 70 °.

By the way, the outlet temperature setting lever may be directly connected to the link lever 61 without using the link lever 62. However, in this case, the outlet temperature characteristic with respect to the drive angle is raised upward as shown in FIG. And the blowout temperature changes rapidly. Therefore, in this example, the link lever 6
2 is provided, and the temperature of the air outlet is as shown by a solid line in FIG.

On the upper surface of the air conditioning case 11, the heater core 1
A defroster opening 19 is opened on the side of the second air passage 90 on the downstream side of the air 3. Defroster opening 19
Is formed downstream of the heater core 13 in the air in this example, but is formed just between the evaporator 12 and the heater core 13 on the vehicle forward side of the heater core 13 when viewed from the position.

The defroster opening 19 blows air toward the inner surface of the vehicle window glass through a defroster duct and a defroster outlet (not shown).
The defroster opening 19 is opened and closed by a defroster door 20, and the defroster door 20 is rotatable by a rotation shaft 20 a rotatably supported by the air conditioning case 11.

At the upper surface of the air-conditioning case 11,
A face opening 21 is opened at a position closest to the vehicle rear side (closer to the occupant) on the air passage 90 side. The face opening 21 is located on the vehicle rear side of the heater core 13 as shown in the drawing. The face opening 21 is for blowing air toward the occupant's head from a face outlet above the instrument panel through a face duct (not shown). The face opening 21 is opened and closed by a face door 22, and the face door 22 has a butterfly shape that is rotatable about a rotation shaft 22a.

A foot opening 25 is formed on the lower surface of the air-conditioning case 11 and on the side of the first air passage 80 on the rear side of the vehicle. The foot opening 25 is for blowing out warm air to the feet of the occupant in the passenger compartment. The foot opening 25 is opened and closed by a foot door 26, and the foot door 26 is rotatable by a rotation shaft 26a rotatably supported by the air conditioning case 11.

On the downstream side of the heater core 13 in the air,
A communication passage 23 that communicates between the first and second air passages 80 and 90 is provided on the most downstream side of the partition plate 15c in the air. In this embodiment, the communication passage 23 is provided with the foot door 26.
(Blowout mode door member). That is, the foot door 26 closes the communication passage 23 in the blowing mode in which the foot opening 25 is opened as in a foot mode or a foot differential mode described later, while the foot door 26 closes the communication passage 23.
Is opened, when the foot opening 25 is closed, the communication mode in which the first air passage 80 and the second air passage 90 communicate with each other is selected.

The defroster door 20, the face door 22, and the foot door 26 are door means for switching the blowing mode, and are connected to a manual operating mechanism for switching the blowing mode of the air-conditioning operation panel via a link mechanism (not shown), a cable or the like. They are connected and operated in conjunction with each other, or the door means for switching the blowing mode is operated in conjunction with a mode switching actuator mechanism using a servomotor.

The hot water valve 14 is a temperature adjusting means, which is connected to a manual operating mechanism for temperature adjustment of an air-conditioning operation panel through a link mechanism, a cable, etc., not shown, and operates in conjunction therewith, or The adjusting means is operated in conjunction with an actuator mechanism for temperature adjustment using a servomotor. Next, the details of the second air passage 90 will be described.

In the second air passage 90, the heater core 1
Partition plates 30a, 30a on the air upstream side and the air downstream side
b is integrally formed with the air conditioning case 11. Partition plate 3
The downstream end of the air 0a is formed in the second air passage 90 at an intermediate position in the vertical direction of the heater core 13 (core portion 13c). Then, the partition plate 30a extends toward the air upstream side (vehicle front side) as shown in the figure, and the air upstream end is located at the upper end of the evaporator 12. Therefore, in the second air passage 90, the conditioned air that has passed through the evaporator 12 is guided by the partition plate 30a,
As shown by an arrow A in the figure, only a part (lower part) of the heater core 13 disposed in the second air passage 90 passes. For example, when both the communication passage 23 and the face opening 21 are closed and the defroster opening 19 is open, the conditioned air that has passed through the heater core 13 flows toward the vehicle front side as indicated by an arrow A in the figure. Make a U-turn,
The air passes through the remaining portion of the heater core exchanger and is finally blown to the defroster opening 19.

On the other hand, in the first air passage 80,
The air-conditioned air that has passed through the evaporator 12 as shown by
The air passes through the heater core 12 once and is blown to the foot opening 25. Next, in the above configuration, the operation of the present embodiment will be described for each blowing mode. (1) Foot outlet mode (FOOT) When setting the maximum heating state, such as when heating is started in winter, the hot water valve 14 is fully opened and the maximum flow rate of hot water flows through the heater core 13. Then, the inside / outside air switching operation mechanism is operated to set the inside / outside air two-layer flow mode. That is, in the blower unit 1, the first inside / outside air switching door 4
Opens the first inside air inlet 2 and closes the outside air passage 3 a from the outside air inlet 3. Further, the second inside / outside air switching door 5 closes the second inside air introduction port 2a and opens the outside air passage 3b from the outside air introduction port 3.

Thus, the first blower fan 6 draws inside air from the first inside air inlet 2 through the suction port 6a, and at the same time, the second blower fan 7 draws outside air from the outside air inlet 3 to the outside air passage. 3b, inhalation is performed via the inlet 7a. The inside air blown by the first blower fan 6 flows through the first air passage 8 and the first air passage 80 of the air conditioning unit 100. Outside air blown by the second blower fan 7 flows through the second air passage 9 and the second air passage 90 of the air conditioning unit 100.

Here, the blow-out mode switching operation mechanism is operated, so that the foot door 26 opens the foot opening 25 and closes the communication passage 23. In addition, face door 22
Closes the face opening 21 and the defroster door 20 opens a small amount of the defroster opening 19. After passing through the evaporator 12, the inside air flowing through the first air passage 80 is heated by the heater core 13, becomes warm air, and blows out to the feet of the occupant in the passenger compartment through the foot opening 25. At the same time, the outside air flowing through the second air passage 90 passes through the evaporator 12, is heated by the heater core 13, becomes hot air, and blows out to the inside of the vehicle window glass through the defroster opening 19. In this case, the first air passages 8, 80
On the side, the inside air, which is hotter than the outside air, is recirculated and heated by the heater core 13, so that the temperature of the hot air blown out to the feet of the occupant increases, and the heating effect can be improved. On the other hand, since the outside air having a lower humidity than the inside air is heated and blown out from the defroster opening 19, the fogging of the window glass can be satisfactorily prevented.

In the foot blowing mode, the amount of air blown from the defroster opening 19 is normally set to about 20%, and the amount of air blown from the foot opening 25 is set to about 80%. Next, when the cabin temperature rises and the heating load decreases, the hot water valve 14 is operated from the fully open position (maximum heating state) to the intermediate opening position (intermediate temperature control region) for the blowing air temperature control, The flow rate of hot water flowing into the heater core 13 is reduced.

In this intermediate temperature control region, since the maximum heating capacity is not required, the inside / outside air suction mode normally closes both the first and second inside air introduction ports 2 and 2a and opens the outside air introduction port 3. It is good to set to the whole outside air mode. However, the setting by manual operation of the occupant closes the outside air introduction port 3 and sets the first and second inside air introduction ports 2 and 2a together in a full inside air mode, or as described above, between the inside air and outside air. Can be set to a two-layer flow of inside / outside air in which air is introduced simultaneously.

(2) Foot defroster blowing mode (F /
D) In the foot defroster blowing mode, the foot door 26 is used to make the air flow from the foot opening 25 and the air flow from the defroster opening 19 substantially equal (50% each).
, The foot opening 25 is fully opened, and the defroster door 20 is fully opened by the defroster door 20.

As a result, the amount of air blown out from the foot opening 25 and the amount of air blown out from the defroster opening 19 can be made substantially equal. In addition, at the time of maximum heating when the hot water valve 14 is fully opened, a two-layer flow mode of the inside and outside air is set so that both the improvement of the heating effect and the defogging property of the window glass can be achieved at the same time. Is the same as Further, a desired intermediate temperature control can be performed by adjusting the opening degree of the hot water valve 14, and in the intermediate temperature control region,
The mode is set to the all-outside air mode, but the setting by manual operation of the occupant may be the all-inside-air mode or the two-layer inside-outside air mode.

In this embodiment, the heater core 13 is configured as a one-way flow type in which warm water flows from the first air passage 80 toward the second air passage 90 in the above-described foot blowing mode and foot defroster blowing mode. As a result, the temperature of the blown air at the outlet of the heater core 13 on the hot water outlet side decreases due to the decrease in the hot water temperature. Therefore, the defroster blowing temperature on the side of the second air passage 90 located on the hot water outlet side decreases, and the anti-fog capability of the window glass may be insufficient. When the above-described two-layer inside / outside air mode is set according to the arrangement position of the heater core 13, the heater core 13 passes through the heater core 13 only once in each of the passages 80 and 90, and the foot opening 25 and the defroster opening 19. When air is blown into the first air passage 80, high-temperature inside air is introduced into the first air passage 80 and low-temperature outside air is introduced into the second air passage 90.
0, the temperature becomes much lower than that of
Temperature difference of conditioned air flowing through 0 and 90 (hereinafter, vertical temperature difference)
But it's big. Thus, the conditioned air from the defroster opening 19 gives a cold to the occupant's head,
May cause discomfort.

Therefore, in this embodiment, as described above, the conditioned air in the second air passage 90 passes through the heater core 13 twice as indicated by the arrow A in the figure, and thus the second air passage 9
Thus, the temperature of the blown conditioned air of 0 can be increased. Thus, in the foot outlet mode and the foot defroster outlet mode, the defroster outlet temperature from the second air passage 90 on the hot water outlet side is reduced to the same level as the foot outlet temperature from the first air passage 80 located on the hot water inlet side. The anti-fog performance of the window glass can be preferentially increased. As a result, the vertical temperature difference can be reduced.

(3) Defroster blowing mode (DEF) In the defroster blowing mode, the face door 22 fully closes the face opening 21. Also, foot door 26
Completely closes the foot opening 25 and opens the communication passage 23. Further, the defroster door 20 fully closes the defroster opening 19, and the communication door 24 fully opens the communication passage 23.
Therefore, the conditioned air from the first and second air passages 80 and 90 joins in the communication passage 23 and blows out only to the inner surface of the window glass through the defroster opening 19 to prevent fogging. In this case, in order to ensure the anti-fog property of the window glass, it is usually preferable to set the whole outside air suction mode. (4) Face Blowing Mode (Face) In the face blowing mode, the face door 22 fully opens the face opening 21 and the defroster door 20 fully closes the defroster opening 19. The foot door 26 fully closes the foot opening 25 and opens the communication passage 23.

Therefore, the air blown from the first air passage 80 and the second air passage merge in the communication passage 23 and are all blown only to the face opening 21. By the way, in this example, the face opening 21 is,
By arranging the defroster opening portion 1 further forward in the vehicle,
As shown in FIG. 9, the conditioned air that has passed through the heater core 13 twice can also flow in.

The face blowing mode is a blowing mode used when cooling the interior of the vehicle in normal summer or the like. For this reason, the heating capacity of the heater core 13 is almost unnecessary, and at the time of starting air conditioning in the summer (for example, when the interior of the vehicle is abnormally high), it is desired to increase the blowing air volume as much as possible to obtain the cooling capacity. I want to reduce resistance.
Therefore, in this example, the face opening 21 is opened in the flow path until the conditioned air that has passed through the heater core 13 once flows into the heater core 13 again. Therefore, the conditioned air that has passed through the heater core 13 only once flows into the face opening 21. As a result, the amount of conditioned air blown to the face opening 21 can be increased, and the cooling capacity can be improved.

In this case as well, the inside / outside air suction mode can be selected by the first and second inside / outside air switching doors 4 and 5 from all inside air, all outside air and two-layer inside / outside air flow. Further, in the maximum cooling state, the entire inside air suction mode is set, and the hot water valve 14 is fully closed to shut off circulation of the hot water to the heater core 13, so that the cooling capacity is maximized.

(5) Bi-level blowing mode (B / L) In the bi-level blowing mode, the face door 22 fully opens the face opening 21. The foot door 26 fully opens the foot opening 25 and closes the communication passage 23. Further, the defroster door 20 is connected to the defroster opening 19.
Is fully closed. Therefore, it is possible to simultaneously blow air from both the upper and lower sides of the vehicle compartment through the face opening 21 and the foot opening 25.

Here, since the heater core 13 is of a one-way flow type, the temperature of the blown air on the side of the first air passage 80 located on the inlet side of the hot water at the outlet side of the heater core 13 is increased, and located on the outlet side of the hot water. The temperature of the blown air on the side of the second air passage 90 can be reduced. Therefore, even in the all outside air mode or the all inside air mode, the first air passage 8
Since the face blowing temperature from the second air passage 90 can be made lower than the foot blowing temperature from 0, the vehicle interior temperature distribution can be made to be in a comfortable state of a head-and-foot hot type. Further, the inside / outside air mode may be set to the inside / outside air two-layer flow mode.

(Second Embodiment) In the first embodiment,
Although the conditioned air passes through the heater core 13 twice in the second air passage 90, in the present embodiment, the first air passage 80
Is an example in which the conditioned air passes through the heater core 13 twice. FIG. 4 shows an overall configuration diagram of the vehicle air conditioner of this example. Note that components that perform the same functions as in the first embodiment are denoted by the same reference numerals.

First, in this embodiment, the communication passage 23 is connected to the foot door 2.
6 is opened and closed by a communication door 50 which is a dedicated communication passage opening and closing member. In addition, the communication door 50 is configured by a plate-shaped door member in which a rotation shaft 50 a is rotatably supported by the air conditioning case 11. The foot door 26 of this embodiment is located just downstream of the evaporator 12 and upstream of the heater core 13 as shown in FIG.
Are inclined so that the lower end is located rearward of the vehicle from the upper end.

The communication door 50 closes the communication passage 23 and sets the inside / outside air mode to the above-described inside / outside air two-layer flow mode when the heating capacity is improved and the anti-fog property is ensured. Into two passages (80, 90). On the other hand, the foot door 26 opens the foot opening 25. Thus, the inside air is blown into the foot opening 25.

The first air passage 80 of this embodiment is indicated by an arrow C in FIG.
As shown by, the conditioned air whose inside air has passed through the heater core 13 is again blown to the foot opening 25 through the heater core 13, and such an air flow is due to the following configuration. First, partition plates 30c and 30d are formed integrally with the air conditioning case 11 on the air upstream side and the air downstream side of the heater core 13. The downstream end of the partition plate 30 c is connected to the heater core 13 in the first air passage 80.
It is formed at an intermediate position in the vertical direction of the (core portion 13c). The partition plate 30c extends to the upstream side of the air (the front side of the vehicle) as shown in the figure, and the upstream end of the partition plate 30c is connected to the foot door 26.
And a frame-shaped seal wall 51 that comes into contact with the plate surface.

That is, the opening 5 surrounded by the seal wall 51
2 is the heater core 1 from the position of the foot door 26.
3, the air-conditioning air flows as indicated by arrow C in FIG. 4 when the foot door 26 closes the opening 52. On the other hand, when the foot door 26 opens the opening 52, the air-conditioned air in the first air passage 80 on the downstream side of the evaporator 12 before passing through the heater core 13, and after making a U-turn and passing through the heater core 13 again, Communicates with the site. That is, the opening 52 constitutes the second communication path of the present invention. The foot door 26 constitutes a blowing mode door member that opens and closes the foot opening 25 and the opening 52.

In this embodiment, the communication door 50 and the foot door 26 are operated in conjunction with each other. When the communication door 50 closes the communication path 23, the foot door 26 opens the foot opening 25. It has become. Next, the operation of this embodiment will be described. First, it is assumed that the inside / outside air mode is the inside / outside air two-layer flow mode, the communication door 50 closes the communication passage 23, the foot door 26 closes the foot opening 25, and closes the opening 52. Then, in the first air passage 80, the conditioned air that has passed through the evaporator 12 is guided by the seal wall 51, the plate surface (upper side in the figure) of the foot door 26, and the partition plate 30c, as shown by the arrow c in the figure. It passes only through a part b (upper part) of the heater core 13 arranged in the first air passage 80.
After that, the conditioned air that has passed through the heater core 13 makes a U-turn toward the vehicle front side as shown by an arrow C in the figure,
The air passes through the remaining portion a (lower portion) of the heater core exchanger again, and is finally blown to the foot opening 25.

As described above, in this example, the temperature of the conditioned air in the first air passage 80 passes through the heater core 13 twice, so that the temperature of the conditioned air can be further increased as compared with the case where the air passes once. On the other hand, in the second air passage 90, for example, when the defroster opening 19 is open and the face opening 21 is closed, as shown by the arrow D in the figure, the evaporator 1
2 passes through the heater core 12 once and is sent to the defroster opening 19.

When the communication passage 50 is opened by the communication door 50 and the foot opening 25 is closed and the opening 52 is opened by the foot door 26 (communication mode), the evaporator 12 passes through the first air passage 80. The conditioned air passes only once through the opening 52 through the lower portion of the heater core 13, and passes through the communication passage 23.
1 or the air is blown to the defroster opening 19.

In this embodiment, as described above, the conditioned air is U-turned so that it passes through the heater core 13 twice.
Turn channel and heater core 13 only once without U-turn
Can be switched with the normal flow path through which the air flows. In the case of a normal flow passage, the foot opening 25 is closed, but the communication passage 23 is opened by the communication door 50, so that the conditioned air in the first air passage 80 is supplied to the second air passage 90. Into the outlet opening (1) on the second air passage 90 side.
9 or 21).

Further, since the foot door 26 is disposed between the evaporator 12 and the heater core 13 as described above, and the foot door 26 is used as a member constituting a U-turn flow path, the first air passage is formed. A dedicated member (for example, a door member) for switching to a U-turn flow path for making the U-turn 80 or a normal passage becomes unnecessary. Further, the air passes through the heater core 13 twice only when the foot opening 25 opens the conditioned air.
Is closed, that is, when it is not necessary to blow high-temperature conditioned air to the feet of the occupant, the passage does not make a U-turn, so that the ventilation resistance in the air conditioning unit 100 can be reduced.

(Third Embodiment) In the first embodiment,
When the blowing mode becomes the bi-level mode, the foot door 2
6, the communication passage 23 is closed, but in this example, the communication passage 23 is slightly opened as shown in FIG. The conditioned air flows through the second air passage 90. As a result, the second
The temperature of the conditioned air in the air passage 90 can be increased.
In addition, this has the following effects.

The face opening 21 is used to guide conditioned air to a face outlet (not shown) in the vehicle interior.
A resin duct usually called a face duct is connected. Therefore, the ventilation resistance is increased by this duct. On the other hand, since the foot opening 25 is directly exposed to the lower part in the vehicle interior, the ventilation resistance does not increase as compared with the face opening 21. For this reason, in the first embodiment,
In the bi-level mode, the airflow of the conditioned air flowing into the face opening 21 is smaller than the airflow flowing into the foot opening 25.

Therefore, in this example, in the bi-level mode as described above, by slightly opening the communication passage 23 with the communication door 50, the air volume of the second air passage 90 can be increased. The air volume of the conditioned air flowing into the air intake 21 and the air volume flowing into the foot opening 25 can be made equal. Also, as shown in FIG.
In order to make it easier for air to flow from the first air passage 80 to the second air passage 90 through 3, a guide portion 15f may be formed at the end of the lower partition 15c.

(Fourth Embodiment) This embodiment is a modification of the blower unit 1 and describes a specific configuration in the case where the inside / outside air mode is manually operated. FIG. 6 shows an overall configuration diagram of the blower unit 1 of the present example. FIG. 7 is a view of FIG. 6 as viewed from the back side of the drawing to the front side. It is to be noted that components having the same functions as those in the above embodiments are denoted by the same reference numerals.

In this example, the inside / outside air two-layer flow mode is set only when the blowing mode is manually set to FOOT or F / D, and when the blowing temperature is manually set to the maximum temperature. . As shown in FIGS. 6 and 7, the first fan 6 and the second fan 7 are arranged so that the direction of the rotation axis points in the vertical direction. An outside air inlet 70 and an inside air inlet 71 are formed in the blower unit 1 above the second fan 7. The outside air inlet 70 and the inside air inlet 72 are selectively opened and closed by a plate-like inside / outside air switching door 73. The inside / outside air switching door 73 is configured to rotate in a range indicated by an arrow by a rotation shaft 73a as shown in FIG.

One end of the rotating shaft 73a (the side seen in FIG. 6)
, A link lever 74 is connected. The link lever 74 is connected to an inside / outside air switching lever 75 (see FIG. 8) of the air conditioning operation panel via a link mechanism (for example, a link lever and a control cable) not shown. ing. Thus, when the inside / outside air switching lever 75 is operated in the left-right direction in FIG. 8, for example, to the leftmost position, the inside / outside air switching door 73 closes the inside air introduction port 71 and opens the outside air introduction port 70. To set all outside air mode. When the inside / outside air switching lever 75 is operated in the left-right direction in FIG. 8 and, for example, to the rightmost position, the inside / outside air switching door 73 opens the inside air introduction port 71 and closes the outside air introduction port 70 to completely close the outside air introduction port 70. Set shy mode.

A communication passage 76 is formed in the blower unit 1 for sucking outside air from the outside air inlet 70 or inside air from the inside air inlet 71 into the first fan 6. That is, outside air or inside air is sucked into the first fan 6 as indicated by an arrow X in FIG. Communication passage 76
Is formed with an inside air introduction port 77. The inside air inlet 77 and the communication passage 76 are provided with a plate-like inside / outside air switching door 78.
It is selectively opened and closed by. That is, the inside / outside air switching door 78
When the inside air introduction port 77 is opened and the communication passage 76 is closed, the outside air from the outside air introduction port 70 or the inside air from the inside air introduction port 71 is not sucked into the first fan 6 and the second air
It is sucked only by the fan 7. The inside / outside air switching door 78 is
It is rotatable by a rotating shaft 78a,
8a is rotated by link mechanisms 79 and 80.

First, the link mechanism 79 will be described.
FIG. 9 is an enlarged view of the link mechanism 79. Link mechanism 79
Is disposed on one end side of the blower unit 1 in the direction of the rotation axis of the rotation shaft 78a (the front and back direction in FIG. 6).
A link lever 81 made of resin is connected to the rotating shaft 78a. The link lever 81 has a cylindrical link pin 8
2 are integrally formed. The link pin 82 is fitted in a triangular link groove 84 of a fan-shaped resin link lever 83.

A link pin 85 is formed integrally with the link lever 83, and an iron control cable 86 is connected to the link pin 85. The other end of the control cable 86 is connected to the link lever 62 via a link mechanism (not shown). Accordingly, the link lever 83 rotates according to the operating position of the valve body of the hot water valve 14, and the link lever 81 rotates accordingly,
The inside / outside air switching door 78 rotates.

In this example, the operating position of the valve element of the hot water valve 14, that is, the blowout temperature is adjusted by a blowout temperature setting lever 87 shown in FIG. In the present embodiment, the operating position of the outlet temperature setting lever 87 is changed between COOL having the lowest outlet temperature and HOT having the highest outlet temperature so that the outlet temperature can be adjusted. Here, in this example, FIG.
As shown at 0, the outlet temperature setting lever 87 can be operated further to the right of the HOT position.
A HOT (hereinafter, ET) can be set. The EXTRA HOT is an operation position for switching the inside / outside air mode to the inside / outside air two-layer flow mode.

In this example, when the operating position of the outlet temperature setting lever 87 is the above-mentioned ET, the link lever 83 is in the position indicated by the two-dot chain line as shown in FIG.
When the operation position of 7 is between COOL and HOT, the link lever 83 is set to the solid line position. That is, when the operation position is between COOL and HOT, the link pin 82 is located at the lowermost end (A) of the link groove 84 as shown in FIG. Can not rotate. Therefore, the inside / outside air switching door 78 is in a state where the inside air introduction port 77 is closed.

Next, the link mechanism 80 will be described. FIG. 11 is an enlarged view of the link mechanism 80. Link mechanism 80
Is arranged on the other end side of the blower unit 1 in the direction of the rotation axis of the rotation shaft 78a (the direction of the front and back in FIG. 7).
That is, the link mechanism 80 is disposed on the opposite side of the link mechanism 79. A link lever 88 made of resin is connected to the rotating shaft 78a. Link lever 88
, A coil spring 95 is attached as an urging member, and the coil spring 95 applies an urging force (restoring force) in the direction F in the figure.

Specifically, one end of the coil spring 95 is bent and hooked so as not to come off the link lever 88, for example. The other end of the coil spring 95 is fixed to, for example, the outer wall surface of the blower unit 1. It has been bent and hooked. By doing so, the inside / outside air switching door 78 is provided with the arrow Y direction in the drawing,
That is, the force acts so as to open the inside air inlet 77.

The link lever 88 is integrally formed with a cylindrical link pin 89. The link pin 89 is fitted in a triangular link groove 91 of a resin fan-shaped link lever 90. A link pin 92 is integrally formed with the link lever 90, and an iron control cable 93 is connected to the link pin 92. The other end of the control cable 93 is connected to a blow mode switching lever 94 via a link mechanism (not shown).

The blow mode switching lever 94 is as shown in FIG. 12, and the blow mode can be switched by its operation position. Accordingly, the link lever 90 is rotated in accordance with the operation position of the blow mode switching lever 94, and the link lever 88 is rotated accordingly, whereby the inside / outside air switching door 78 is rotated. In this example, when the operation position of the blow mode switching lever 94 is FOOT or F / D, the link lever 90 is at the solid line position as shown in FIG. 11, and the operation position of the blow mode switching lever 94 is Fac.
In the case of e, B / L, and DEF, the link lever 90 is set to the position indicated by the two-dot chain line. In other words, when the operation position is Face, B / L, or DEF, the link pin 89 is located at the lowermost end (D) of the link groove 91 as shown in FIG. Cannot rotate as center. Therefore, the inside / outside air switching door 78 is in a state where the inside air introduction port 77 is closed.

Next, the operation of the inside / outside air switching door 78 will be described. First, when the temperature setting lever 87 is between the COOL and the HOT, the inside / outside air switching door 78 is closed because the link pin 82 is stuck in the link groove 84 so as not to rotate the link lever 81 as shown in FIG. The inlet 77 is closed. In this state, no matter what position the blowout mode switching lever 94 is operated, the link pin 89 moves in the link groove 91 through the arrow K in the drawing.
, The inside / outside air switching door 78 does not rotate. Therefore, when the temperature setting lever 87 is between COOL and HOT, the inside / outside air mode is selected according to the operation position of the inside / outside air switching lever 75.

If the blowing mode is Face, B /
In the case of L and DEF, since the link pin 89 is stuck in the link groove 91 so as not to rotate the link lever 88, the inside / outside air switching door 78 has the link mechanism 79,
80 so as not to rotate. Next, it is assumed that the temperature setting lever 87 is operated to the ET from this state. Then, the link pin 82 is inserted into the link groove 8 in FIG.
4 is located at the uppermost part (A). In this position, the link pin 82 rotates the link lever 81 counterclockwise along the link groove 84, that is, the inside / outside air switching door 78 can open the inside air inlet 77. In this state, no operating force for rotating the inside / outside air switching door 78 by the link mechanism 79 works, and the operating force is obtained by the link mechanism 80.

That is, when the temperature setting lever 87 is operated at ET and the blowout mode switching lever 94 is operated at FOOT or F / D, the link pin 89 can move as shown by the arrow M in FIG. In this state, the link lever 88 is naturally rotated by the coil spring 95. Thus, the inside / outside air switching door 78 is connected to the inside air introduction port 77.
And the communication path 76 is closed. And
In this case, when the operation position of the inside / outside air switching lever 75 is the all outside air mode, the inside / outside air mode is actually the inside / outside air two-layer flow mode.

When the operation position of the inside / outside air switching lever 75 is in the all inside air mode, inside air is introduced into the first air passage 8 from the inside air introduction port 77, and the inside air introduction port 71 is introduced into the second air passage 9. The shy atmosphere is introduced from. On the other hand, when the temperature setting lever 87 is operated to the ET and the blowout mode switching lever 94 is originally operated to a mode other than FOOT or F / D, the link pin 89 rotates the link lever 88 as described above. The inside / outside air switching door 78 is held so as not to rotate since it is stuck in the link groove 91 so as not to be caused to rotate. Therefore, when the inside air introduction port 77 is opened by the inside / outside air switching door 78 and the blowout mode switching lever 94 is operated to a position other than FOOT or F / D, the link pin 89 is moved with respect to the link groove 91. 11 moves as shown by the arrow N in FIG.
0 is a position indicated by a two-dot chain line in the figure. In FIG. 9,
The link pin 82 moves in the direction of the arrow V. Therefore, the inside / outside air switching door 78 is in a state where the inside air introduction port 77 is closed.

Then, from this state, the temperature setting lever 8
Regardless of the position where the button 7 is operated, if the blowing mode is Face, B / L, or DEF as described above, the link pin 89 is stuck in the link groove 91 so as not to rotate the link lever 88. Therefore, inside and outside air switching door 7
8 is held so as not to rotate. Thus, when the temperature setting lever 87 is operated, the link pin 82 only moves with respect to the link groove 84 as shown by the arrow R in FIG.

Further, from the state where the inside air introduction port 77 is opened by the inside / outside air switching door 78, the blowout temperature setting lever 87
Is operated other than the above-mentioned ET, the link pin 82 overcomes the urging force of the coil spring 95 and moves relative to the link groove 84 as shown by the arrow L in FIG. 9, and the link lever 83 becomes the solid line position in the figure. . Therefore, the link pin 89
Move in the direction opposite to the arrow M in FIG. As a result, the inside / outside air switching door 78 is in a state where the inside air introduction port 77 is closed.

(Other Embodiments) In the above embodiment, the flow of warm water to the heater core 13 is made to flow upward from below, but it is also possible to flow warm water from above to downward. In each of the above embodiments, the heater core 1
Although the air-conditioned air passes through No. 3 twice, it may be passed three times.

In the second embodiment, the communication passage 23 may be slightly opened by the communication door 50 in the bi-level blowing mode, the foot blowing mode, and the foot defroster mode. Further, in the third embodiment, the communication path 23 may be slightly opened by the foot door 26.

In each of the above embodiments, the amount of hot water supplied to the heater core 13 is adjusted in order to adjust the temperature of the blown conditioned air. However, the temperature of the hot water may be adjusted. Air conditioner.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a ventilation system according to a first embodiment of the present invention.

FIG. 2 is a detailed view of a hot water valve 14 in the first embodiment.

FIG. 3 is an overall configuration diagram of a hot water valve 14 in each of the above embodiments.

FIG. 4 is an overall configuration diagram of a ventilation system according to a second embodiment of the present invention.

FIG. 5 is an overall configuration diagram of a ventilation system according to a third embodiment of the present invention.

FIG. 6 is an overall configuration diagram of a blower unit according to a fourth embodiment of the present invention.

FIG. 7 is an overall configuration diagram of a blower unit according to a fourth embodiment of the present invention.

FIG. 8 is an inside / outside air switching lever 7 in the fourth embodiment.
FIG.

FIG. 9 is a detailed view of a link mechanism 79 in the fourth embodiment.

FIG. 10 shows a temperature setting lever 8 according to the fourth embodiment.
FIG.

FIG. 11 is a detailed view of a link mechanism 80 according to the fourth embodiment.

FIG. 12 is a view illustrating a blow mode switching lever 94 according to the fourth embodiment.

[Explanation of symbols]

8, 80: first air passage, 9, 90: second air passage, 1
DESCRIPTION OF SYMBOLS 1 ... Air-conditioning case, 12 ... Evaporator, 13 ... Heater core, 19 ... Defroster opening, 21 ... Face opening,
25 ... foot opening.

Claims (9)

[Claims] 1. An air conditioning case (11) forming an air flow path into a vehicle cabin; a heating heat exchanger (13) provided in the air conditioning case (11) for heating conditioned air; Foot opening (25) that blows out the conditioned air that has passed through the heat exchanger (13) toward the feet of the passengers in the vehicle compartment
A defroster opening (1) for blowing the conditioned air that has passed through the heating heat exchanger (13) toward the inner surface of the vehicle window glass.
9), a first air passage (8, 8) provided in the air conditioning case (11) and through which the inside air flows toward the foot opening (25).
80), and the first air passages (8, 8) in the air conditioning case (11).
80), and the defroster opening (19) is formed.
A second air passage (9, 90) through which outside air flows toward the air conditioner, wherein the conditioned air introduced into the first air passage (8, 80) is provided by the heating heat exchanger. (13) only once, and in the second air passage (9, 90),
The vehicle wherein the conditioned air that has passed through the heating heat exchanger (13) passes through the heating heat exchanger (13) again and is blown to the defroster opening (19). Air conditioner. 2. The first air passage (8, 80) and the second air passage (9, 2) in the air conditioning case (11) on the air upstream side of the heating heat exchanger (13).
90), and a cooling heat exchanger (1) for cooling air.
2) In the second air passage (9, 90), the conditioned air that has passed through the cooling heat exchanger (12) passes through the heating device disposed in the second air passage (9, 90). Heat exchanger (1
The vehicle according to claim 1 or 2, wherein after passing only a part of (3), a U-turn is made to pass through the remaining part of the heating heat exchanger (13). Air conditioner. 3. The air conditioning case (11), wherein the second
A face opening (21) that blows out conditioned air toward the upper body of the occupant is disposed on the side of the air passage (9, 90). 3. The vehicle air conditioner according to claim 1, wherein the air conditioner is disposed at a position where the air-conditioned air that has passed only once) flows in once. 4. An air conditioning case (11) forming an air flow path into a vehicle interior; a heating heat exchanger (13) provided in the air conditioning case (11) for heating conditioned air; Foot opening (25) that blows out the conditioned air that has passed through the heat exchanger (13) toward the feet of the passengers in the vehicle compartment
A defroster opening (1) for blowing the conditioned air that has passed through the heating heat exchanger (13) toward the inner surface of the vehicle window glass.
9), a first air passage (8, 8) provided in the air conditioning case (11) and through which the inside air flows toward the foot opening (25).
80), and the first air passages (8, 8) in the air conditioning case (11).
80), and the defroster opening (19) is formed.
A second air passage (9, 90) through which outside air flows toward the air conditioner, wherein the first air passage (8, 80) has passed through the heating heat exchanger (13). An air conditioner for a vehicle, wherein the conditioned air is again sent to the foot opening (25) through the heating heat exchanger (13). 5. The first air conditioner in the air conditioning case (11) on the air upstream side of the heating heat exchanger (13).
An air passage (8, 80) and said second air passage (9, 9);
0), and a cooling heat exchanger (1) for cooling air.
2), in the first air passage (8, 80), the conditioned air that has passed through the cooling heat exchanger (12) passes through the heating device disposed in the first air passage (8, 80). Heat exchanger (1
The vehicle air conditioner according to claim 4, wherein after passing through only a part of (3), a U-turn is made to pass through the remaining part of the heating heat exchanger (13). . 6. A first communication unit disposed downstream of the heating heat exchanger (13) in the air and communicating the first air passages (8, 80) and the second air passages (9, 90). Passage (2
3) and a communication path opening / closing means (5) for opening and closing the first communication path (23).
0), provided in the first air passage (8, 80) on the downstream side of the cooling heat exchanger (12), before the conditioned air passes through the heating heat exchanger (13). A second communication path (52) that communicates the part with the part after making a U-turn and passing again through the heating heat exchanger (13); the foot opening (25) and the second communication path ( 5
An opening mode door member (26) that opens and closes the first communication passage (2) by the communication passage opening / closing means (50).
3) is opened and the outlet mode door member (2) is opened.
The vehicle air conditioner according to claim 5, wherein a communication mode in which the foot opening (25) is closed and the second communication passage (52) is opened at (6) is selectable. 7. The heating heat exchanger (13) extends from the first air passage (8, 80) to the second air passage (9, 9).
The vehicle air conditioner according to any one of claims 1 to 6, wherein the air conditioner is configured as a one-way flow type in which hot water flows toward 0). 8. The first air passage (8, 80) and the second air passage (9, 90) are arranged so as to be vertically arranged, and the first air passage (8, 80) is The vehicle air conditioner according to claim 7, wherein the vehicle air conditioner is located below the second air passage (9, 90). 9. A temperature adjusting means (14) for adjusting the temperature of the conditioned air by adjusting the flow rate or the temperature of the hot water circulating through the heating heat exchanger (13). The vehicle air conditioner according to any one of 1 to 8.