WO2012003703A1

WO2012003703A1 - Heat exchange equipment and cooling system

Info

Publication number: WO2012003703A1
Application number: PCT/CN2010/080336
Authority: WO
Inventors: 高强; 李艳星; 黄宁杰
Original assignee: 三花丹佛斯（杭州）微通道换热器有限公司
Priority date: 2010-07-08
Filing date: 2010-12-27
Publication date: 2012-01-12
Also published as: CN101871708A; CN101871708B

Abstract

A heat exchange equipment and a cooling system with the heat exchange equipment, in which the heat exchange equipment includes a heat exchanger and a refrigerating medium flowing direction changing unit connected with the heat exchanger. The heat exchanger has a first opening and a second opening, and the refrigerating medium flowing direction changing unit is used for changing the flowing direction of the refrigerating medium in the heat exchanger. When the heat exchange equipment is used for an evaporator in the cooling system, defrosting is executed by changing the flowing direction of the refrigerating medium. Thus, the times of circulation defrosting of the cooling system can be reduced, the running of the cooling system is stabilized and the efficiency is enhanced.

Description

Heat exchange device and refrigeration system

Technical field

The present invention relates to a heat exchange device and a refrigeration system having the same. Background technique

The heat exchanger is an essential device in the heat pump system and can be used as an outdoor unit and an indoor unit in the heat pump system. In the outdoor unit in winter, the heat exchanger is an evaporator. When the evaporation temperature is lower than zero, the moisture in the air around the surface of the evaporator gradually freezes. When the frost layer on the surface of the evaporator reaches a certain thickness, the cooling effect will be affected. Therefore, it is necessary to defrost the evaporator in time. In refrigeration or refrigeration applications, such as in cold storage, indoor side heat exchangers are used as evaporators, operating at very low ambient temperatures, accumulating large amounts of frost on the evaporator surface, heat exchanger heat transfer efficiency and refrigeration system operation Efficiency has a significant impact and therefore requires defrosting.

Traditionally, reverse cycle defrosting is used, that is, when defrosting is required, the refrigerant flows in the reverse direction throughout the refrigeration system, the evaporator acts as a condenser, and the condenser acts as an evaporator, so the defrosting operation interrupts the refrigeration system. Normal operation, which reduces work efficiency. Moreover, due to the uneven temperature distribution on the refrigerant circulation circuit and the influence of the wind direction, the accumulation rate of the frost layer on each part of the evaporator is not equal, and when any frost layer on the evaporator needs to be removed, The defrosting operation of the evaporator is required. Frequent defrosting increases the fluctuation of the refrigeration system, adversely affects the cooling or heating control environment and reduces the operating efficiency of the whole machine. Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Accordingly, it is an object of the present invention to provide a heat exchange device by which the fluctuation of the refrigeration system can be reduced by the defrosting operation, and the overall efficiency can be improved.

Another object of the present invention is to provide a refrigeration system having the above heat exchange device.

A heat exchange apparatus according to an embodiment of the first aspect of the present invention includes: a heat exchanger having a first opening and a second opening; and a refrigerant flow direction changing unit, the refrigerant flow direction changing unit and changing The heat exchanger is connected to change the flow direction of the refrigerant in the heat exchanger.

According to the heat exchange device of the embodiment of the present invention, for example, when used as an evaporator in a refrigeration system, the evaporator can be defrosted only by changing the flow direction of the refrigerant in the evaporator, thereby reducing the number of reverse cycle defrosting Even reverse cycle defrosting can be avoided. Therefore, the operation of the refrigeration system is more stable and the system efficiency is improved.

In addition, the heat exchange device according to the above embodiment of the present invention may further have the following additional technical features: In one embodiment of the present invention, the refrigerant flow direction changing unit includes first to fourth control valves, wherein the first control The inlet of the valve is connected to the first opening and the outlet of the first control valve is connected to the second opening; the second control valve is connected Between the inlet of the first control valve and the first opening, wherein the inlet of the second control valve is connected to the inlet of the first control valve and the outlet of the second control valve is connected to the first opening; the inlet of the third control valve is connected a second control valve is connected between the outlet and the first opening and the third control valve is connected to the second opening; and the fourth control valve is connected between the outlet of the third control valve and the outlet of the first control valve and the second opening Wherein the inlet of the fourth control valve is connected to the outlet of the first control valve and the second opening and the outlet of the fourth control valve is connected to the outlet of the third control valve.

Specifically, for example, at least one of the first to fourth control valves is a solenoid valve.

Further, the heat exchanger includes: a first header, the first opening is disposed on the first header; and the second header is spaced apart from the first header a predetermined distance and a second opening is disposed on the second header; a heat exchange tube, two ends of each heat exchange tube are respectively connected to the first and second headers to communicate with the first and the second through the refrigerant passage therein a second header; and fins, the fins being disposed between adjacent heat exchange tubes, respectively.

In an embodiment of the invention, the heat exchanger includes a first heat exchanger and a second heat exchanger, wherein a second opening of the first heat exchanger is in communication with the first opening of the second heat exchanger so that The first heat exchanger is in series with the second heat exchanger.

Optionally, the second opening of the first heat exchanger and the first opening of the second heat exchanger are in communication through the intermediate connection tube. A refrigeration system according to an embodiment of the second aspect of the present invention includes a compressor, an evaporator, a throttle structure, and a condenser, which are sequentially connected, wherein the evaporator may be the heat exchange device of the first aspect of the invention.

The refrigeration system according to the present invention further includes a four-way valve having four orifices, wherein the two orifices are respectively connected to the inlet and outlet of the compressor, and the other two orifices are respectively connected to the condenser and the evaporator Connected.

The additional aspects and advantages of the invention will be set forth in part in the description which follows. DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic view of a heat exchange device according to an embodiment of the present invention;

Figure 2 is a schematic view of a heat exchanger of a heat exchange device in accordance with an embodiment of the present invention;

Figure 3 is a side view of the heat exchanger shown in Figure 1;

Figure 4 is a schematic view showing the flow of the refrigerant in the first direction in the heat exchange device shown in Figure 1;

Figure 5 is a schematic view showing the flow of the refrigerant in the heat exchange device shown in Figure 1 in a second direction opposite to the first direction; Figure 6 is a schematic view of the heat exchanger of the heat exchange device according to another embodiment of the present invention; ;

Figure 7 is a side view of the heat exchanger shown in Figure 6;

Figure 8 is a view showing the flow of the refrigerant in the first direction in the heat exchange device shown in Figure 6;

Figure 9 is a schematic view showing the flow of the refrigerant in the second direction in the heat exchange device shown in Figure 6; Figure 10 is a schematic illustration of a refrigeration system in accordance with one embodiment of the present invention;

Figure 11 is a schematic illustration of a refrigeration system in accordance with another embodiment of the present invention;

Figure 12 is a schematic illustration of a refrigeration system in accordance with yet another embodiment of the present invention. detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "longitudinal", "transverse", "upper", "lower", "previous", "rear", "left", "right", "vertical", Orientation or positional relationship of "horizontal,", "top", "bottom", "inside", "outside", etc., is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and the description of the cylinder. It is not intended to be a limitation or limitation of the invention.

Moreover, the terms "first," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be, for example, mechanically or electrically connected, or The internal communication between the two components may be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms may be understood according to specific circumstances.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a heat exchange device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, wherein in the following description, a heat exchange device is used, for example, as an evaporator in a refrigeration system.

As shown in FIG. 1, a heat exchange device according to an embodiment of the present invention includes a heat exchanger 100 and a refrigerant flow direction changing unit connected to the heat exchanger 100, and a refrigerant flow direction changing unit is used to change the heat exchange of the refrigerant. The direction of flow within the device 100.

The heat exchanger 100 has a first opening 101 and a second opening 201. For example, the first opening 101 can serve as an inlet for the heat exchanger 100, and the second opening 201 can serve as an outlet for the heat exchanger 100. As shown in FIG. 1, the refrigerant flows in a first direction indicated by a solid arrow A. That is, the refrigerant enters the heat exchanger 100 from the first opening 101, and then exits the heat exchanger 100 from the second opening 201, and when the defrosting is required, the flow of the refrigerant in the heat exchanger 100 is changed by the refrigerant flow direction changing unit. In the direction, the refrigerant flows in the second direction indicated by the broken line arrow B, that is, the refrigerant enters the heat exchanger 100 from the second opening 201, and then exits the heat exchanger 100 from the first opening 101.

Therefore, the heat exchange device according to the embodiment of the present invention can be defrosted only by changing the flow direction of the refrigerant in the heat exchanger 100, and the refrigerant can be reversely circulated throughout the refrigeration system, thereby reducing the system reverse cycle defrosting The number can even avoid the system reverse cycle defrost. Therefore, the operation of the refrigeration system is more stable and the system efficiency is improved.

As shown in FIG. 1, in a specific example of the present invention, the refrigerant flow direction changing unit includes a first control valve VI, The second control valve V2, the third control valve V3 and the fourth control valve V4.

The inlet of the first control valve VI is connected to the first opening 101 and the outlet of the first control valve VI is connected to the second opening 201.

The second control valve V2 is connected between the inlet of the first control valve VI and the first opening 101. Specifically, the inlet of the second control valve V2 is connected to the inlet of the first control valve VI and the outlet of the second control valve V2 is The first openings 101 are connected.

The inlet of the third control valve V3 is connected between the outlet of the second control valve V2 and the first opening 101, and the outlet of the third control valve V3 is connected to the second opening 201.

The fourth control valve V4 is connected between the outlet of the first control valve VI and the outlet of the third control valve V3, more specifically, the inlet of the fourth control valve V4 and the outlet of the first control valve V and the second opening 201 The outlet of the fourth control valve V4 is connected to the outlet of the third control valve V3.

The first control valve VI, the second control valve V2, the third control valve V3, and the fourth control valve V4 may be, for example, solenoid valves, but the present invention is not limited thereto.

As shown in Fig. 1, in use, the solenoid valves VI, V3 are closed, the solenoid valves V2, V4 are open, and the refrigerant flows in the heat exchanger 100 in the direction A (first direction), that is, the refrigerant passes through the first opening 101. The heat exchanger 100 is entered and then discharged through the second opening 201. When defrosting is required, the solenoid valves V2, V4 are closed, the solenoid valves VI, V3 are opened, and the refrigerant enters the heat exchanger 100 from the second opening 201 through the solenoid valve VI, flows in the direction B (second direction), and then flows from the second An opening 101 is discharged, thereby defrosting the first open section of the heat exchanger 100 (a section of the heat exchanger adjacent the first opening). The refrigerant discharged from the first opening 101 cannot pass through the solenoid valves VI and V4, but is returned to the side of the second opening 201 through the solenoid valve V3. After the defrosting is completed, the solenoid valves VI, V3 are closed, the solenoid valves V2, V4 are opened, and the refrigerant flows in the direction A of the heat exchanger 100.

2-5 illustrate a heat exchanger 100 that is a heat exchange device of one embodiment of the present invention. The heat exchanger 100 can be, for example, a parallel flow heat exchanger. In some examples of the invention, as shown in Figures 2 and 3, heat exchanger 100 includes a first header 1, a second header 2, a heat exchange tube 3, and fins 4.

The first opening 101 is provided on the first header 1, and the second header 2 is spaced apart from the first header 1 by a predetermined distance and the second opening 201 is formed thereon. As shown in FIGS. 2 and 3, the first opening 101 and the second opening 201 are respectively in the form of a length of tubes connected to the first header 1 and the second header 2, and thus, the description of the practice of the present invention In the middle, the opening has the same meaning as the open tube.

Two ends of each heat exchange tube 3 are respectively connected to the first header tube 1 and the second header tube 2, so that the refrigerant passages in the heat exchange tubes 3 communicate with the first header tube 1 and the second header tube 2 . The fins 4 are disposed between adjacent heat exchange tubes 3, respectively. The heat exchanger 3 can be, for example, a flat tube, and the refrigerant passage therein can be, for example, a microchannel.

As shown in Figures 4 and 5, when the refrigeration system using the heat exchanger 100 is in the heating mode, the refrigerant flows in the direction A within the heat exchanger 100, i.e., enters the first header 1 from the inlet 101 and passes through the outlet. 201 discharge heat exchanger 100, in other words In Figs. 2 and 3, the refrigerant flows from the bottom to the top.

The lowest temperature point on the heat exchanger 100 will appear in the first open section of the heat exchanger 100 (i.e., a section of the heat exchanger that is adjacent to the first opening 101) where the frosting is most severe and the amount of frosting flows along the refrigerant. Direction A is gradually reduced. After the heat exchanger 100 is operated for a period of time, the frost layer on the inlet section of the heat exchanger 100 is accumulated more (the refrigerant temperature in the tube is lower than the refrigerant temperature at the outlet: below zero), and the second opening in the heat exchanger 100 The frost layer on the segment (i.e., the heat exchanger adjacent to the second opening 201) is less accumulated or frost-free (the refrigerant temperature in the tube is above zero), and the first segment needs to be defrosted.

To this end, the flow direction of the refrigerant in the heat exchanger 100 is reversed by the refrigerant flow direction changing unit, and the refrigerant flows in the direction B in the heat exchanger 100, in other words, the refrigerant enters the second header from the second 201. 2, and then discharged from the first opening 101.

Since the flow direction of the refrigerant is reversed in the heat exchanger 100, the relatively high temperature portion and the low temperature portion of the refrigerant in the heat exchange tube 3 are also correspondingly adjusted, and the original heat exchanger 100 has more frosted portions (for example, In the lower part of FIG. 2 and FIG. 3, the temperature of the refrigerant in the heat exchange tube 3 is higher than zero after the temperature is adjusted, the frost layer is gradually melted, and the upper portion of the heat exchanger 100 is turned to the rear after the refrigerant is turned, and the temperature is lower than zero. The frost layer gradually accumulates. When the upper frost layer needs to be defrosted, the flow direction of the refrigerant is reversed by the flow of the refrigerant to the changing unit, and the circulation is performed. As shown in Fig. 10, the refrigerant does not need to be reversely circulated throughout the refrigeration system. Therefore, the number of defrosting can be reduced or even reverse cycle defrosting can be performed, the temperature of the cooled environment is stabilized, the number of defrosting is reduced, the operation of the refrigeration system is more stable, and the efficiency of the refrigeration system is improved. Of course, if the amount of frost on the heat exchanger 100 is severe, the refrigerant can also be reversely circulated throughout the refrigeration system.

More specifically, as shown in Figs. 4 and 5, the refrigerant flow direction changing unit includes a first control valve VI, a second control valve V2, a third control valve V3, and a fourth control valve V4.

The second control valve V2 is connected between the inlet of the first control valve VI and the first opening 101, more specifically, the inlet of the second control valve V2 is connected to the inlet of the first control valve VI and the second control valve V2 The outlet is connected to the first opening 101.

As described above, in use, referring to FIG. 4, the solenoid valves VI, V3 are closed, and the solenoid valves V2, V4 are opened, whereby the refrigerant enters the first header 1 from the first opening 101 in the direction A, and then enters the heat exchange sequentially. Tube 3, second header 2 and second 201. When defrosting is required, as shown in FIG. 5, the solenoid valves V2, V4 are closed, and the solenoid valves VI, V3 are opened, whereby the refrigerant enters the second header 2 from the second opening 201 through the solenoid valve VI, and then sequentially The dotted arrow B enters the heat exchange tube 3, The first header 1 and the first opening 101 are discharged from the first opening 101, thereby defrosting the first open end of the heat exchanger 100. The refrigerant discharged from the first opening 101 cannot pass through the solenoid valves VI and V4, but is returned to the side of the second opening 201 through the solenoid valve V3. After the defrosting is completed, the solenoid valves VI, V3 are closed, the solenoid valves V2, V4 are opened, and the refrigerant flows in the direction A in the heat exchanger 100.

A heat exchanger device according to another embodiment of the present invention will now be described with reference to Figs. 6-9.

As shown in Figures 6-9, heat exchanger 100 includes a first heat exchanger 100a and a second heat exchanger 100b. The second opening 201a of the first heat exchanger 100a communicates with the first opening 201b of the second heat exchanger 100b such that the first heat exchanger 100a is connected in series with the second heat exchanger 100b. For example, the second opening 201a of the first heat exchanger 100a and the first opening 101b of the second heat exchanger 100b are in communication through the intermediate connecting pipe 5, but the invention is not limited thereto, for example, the first heat exchanger 100a And the second heat exchanger 100b may also be two parts formed by bending the flat plate heat exchanger.

As shown in Figures 8 and 9, in some embodiments of the present invention, the refrigerant flow direction changing unit includes a first control valve VI, a second control valve V2, a third control valve V3, and a fourth control valve V4.

The inlet of the first control valve VI is connected to the first opening 101a of the first heat exchanger 100a and the outlet of the first control valve VI is connected to the second opening 201b of the second heat exchanger 100b.

The second control valve V2 is connected between the inlet of the first control valve VI and the first opening 101a of the first heat exchanger 100a such that the inlet of the second control valve V2 is connected to the inlet of the first control valve VI and the second control The outlet of the valve V2 is connected to the first opening 101a of the first heat exchanger 100a.

The inlet of the third control valve V3 is connected between the outlet of the second control valve V2 and the first opening 110a of the first heat exchanger 100a and the outlet of the third control valve V3 and the second of the second heat exchanger 100b The openings 201 b are connected.

The fourth control valve V4 is connected between the outlet of the first control valve VI and the outlet of the third control valve V3, the fourth control valve

The inlet of V4 is connected to the outlet of the first control valve VI and the second opening 201b of the second heat exchanger 100b and the outlet of the fourth control valve V4 is connected to the outlet of the third control valve V3.

When the refrigeration system using the heat exchanger 100 as the evaporator is in the heating mode, as shown in FIG. 8, the solenoid valves VI, V3 are closed, and the solenoid valves V2, V4 are opened, whereby the refrigerant flows in the first direction A, That is, the first header 101a of the first heat exchanger 100a enters the first header la of the first heat exchanger 100a, and then passes through the heat exchange tubes 3a of the first heat exchanger 100a, the first heat exchanger 100a. The second header 2a and the second opening 201a of the first heat exchanger 100a. Then, from the second opening 201 a of the first heat exchanger 100 a through the intermediate connection pipe 5 into the first opening 101 b of the second heat exchanger 100 b , and then sequentially through the heat exchange tube 3 b of the second heat exchanger 100 b , The second header 2b of the second heat exchanger 100b and the second opening 201b of the second heat exchanger 100b.

When defrosting is required, as shown in Fig. 9, the solenoid valves V2, V4 are closed, and the solenoid valves VI, V3 are opened, whereby the refrigerant enters the second opening 201b from the second heat exchanger 100b through the solenoid valve VI. The second header 2b of the heat exchanger 100b, and then sequentially enters the heat exchange tube 3b of the second heat exchanger 100b in the second direction B, the first opening of the second heat exchanger 100b 101b, the intermediate connecting pipe 5, the second opening 201a of the first heat exchanger 100a, the heat exchange tube 3a of the first heat exchanger 100a, the first header 1a of the first heat exchanger 100a and the first The first opening 101a of the heat exchanger 100a is discharged from the first opening 101a of the first heat exchanger 100a, thereby defrosting the first open section of the heat exchanger first heat exchanger 100a. The refrigerant discharged from the first opening 101a of the first heat exchanger 100a cannot pass through the solenoid valves VI and V4, but is returned to the second opening 201b-side of the second heat exchanger 100b through the solenoid valve V3. After the defrosting is completed, the solenoid valves VI and V3 are closed, the solenoid valves V2 and V4 are opened, and the refrigerant flows in the direction A in the heat exchanger.

Therefore, the heat exchange device according to the embodiment of the present invention can easily perform defrosting by changing the flow direction of the refrigerant therein, eliminating or reducing the reverse circulation of the refrigerant in the entire refrigeration system, and reducing or even eliminating the reverse cycle of the refrigeration system. The number of defrosts makes the refrigeration system run more stable and the efficiency of the refrigeration system is improved. Similarly, the start time of the defrost operation can be controlled by the refrigeration system according to the frosting condition, and the flow direction of the refrigerant in the heat exchanger can be changed to perform defrosting when the frost amount is not very serious, so that The performance of the refrigeration system is not excessively attenuated, and the temperature of the control environment is kept stable.

According to a particular embodiment of the invention, heat exchanger 100 can be a parallel flow heat exchanger, such as a microchannel heat exchanger.

Next, a refrigeration system according to an embodiment of the present invention will be described with reference to FIG. As shown in Fig. 10, the refrigeration system includes a compressor 200, an evaporator 100, a throttle structure 400, and a condenser 300, which are sequentially connected. The evaporator 100 is the above-described heat exchange device according to an embodiment of the present invention, and the evaporator 100 can change the flow direction of the refrigerant in the evaporator 100 by the refrigerant flow direction changing unit. Therefore, when defrosting is required, it is only necessary to change the flow direction of the refrigerant in the evaporator 100 without changing the flow direction of the refrigerant throughout the system, at which time the refrigerant flows in the entire refrigeration system, for example, in the direction C. Therefore, the operation of the refrigeration system is more stable and the efficiency of the refrigeration system is improved.

Figure 11 illustrates a refrigeration system capable of performing a reverse cycle of the system as compared to the refrigeration system of Figure 10, such as a refrigerant capable of flowing in a direction C or D in the system, in accordance with another embodiment of the present invention. . As shown in FIG. 11, the evaporator 100, the throttle structure 400, the condenser 300 and the four-way valve 500 are sequentially connected, and the four-way valve 500 has four orifices, two of which are respectively associated with the inlet of the compressor 200 and The outlets are connected and the other two orifices are connected to the condenser 300 and the evaporator 100, respectively.

When the amount of frosting is small, the flow direction of the refrigerant in the evaporator 100 can be changed by the first to fourth control valves V1 - V4, for example, from the original direction A to the direction B, thereby performing defrosting.

When the amount of frost is very large, the flow direction of the refrigerant in the entire refrigeration system can be changed, for example, the direction C of the refrigerant is converted into the direction D, thereby defrosting through the system reverse cycle.

In the refrigeration system shown in Figures 10 and 11, the heat exchanger 100 is a copper tube finned heat exchanger. In some embodiments of the invention, as shown in Figure 12, heat exchanger 100 in a refrigeration system is a parallel flow heat exchanger, such as the heat exchanger shown in Figure 1.

In the description of the present specification, reference is made to the terms "one embodiment", "some embodiments", "example", "specific" The description of the "," or "some examples" and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present invention. The illustrative representations are not necessarily referring to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While the embodiments of the present invention have been shown and described, the embodiments of the invention may The scope of the invention is defined by the claims and their equivalents.

Claims

Claim

A heat exchange device, comprising:

a heat exchanger having a first opening and a second opening; and

The refrigerant flows toward the changing unit, and the refrigerant flow direction changing unit is connected to the heat exchanger for changing the direction of the refrigerant in the heat exchanger.

2. The heat exchange device according to claim 1, wherein the refrigerant flow direction changing unit includes first to fourth control valves,

Wherein the inlet of the first control valve is connected to the first opening and the outlet of the first control valve is connected to the second opening; the second control valve is connected between the inlet of the first control valve and the first opening, wherein the second control valve The inlet is connected to the inlet of the first control valve and the outlet of the second control valve is connected to the first opening;

An inlet of the third control valve is coupled between the outlet of the second control valve and the first opening and an outlet of the third control valve is coupled to the second opening;

a fourth control valve is coupled between the outlet of the third control valve and the outlet of the first control valve and the second opening, wherein the inlet of the fourth control valve is coupled to the outlet of the first control valve and the second opening and the fourth control valve The outlet is connected to the outlet of the third control valve.

The heat exchange device according to claim 2, wherein at least one of the first to fourth control valves is a solenoid valve.

4. The heat exchange device according to claim 1, wherein the heat exchanger comprises:

a first header, the first opening is disposed on the first header;

a second header, the second header is spaced apart from the first header by a predetermined distance and the second opening is disposed on the second header;

a heat exchange tube, wherein two ends of each heat exchange tube are respectively connected to the first and second headers to communicate the first and second headers through a refrigerant passage therein; and

The fins are respectively disposed between adjacent heat exchange tubes.

The heat exchange device according to claim 4, wherein the heat exchanger comprises a first heat exchanger and a second heat exchanger, wherein the second opening and the second heat exchange of the first heat exchanger The first opening of the device is in communication such that the first heat exchanger is in series with the second heat exchanger.

6. The heat exchange apparatus according to claim 5, wherein the second opening of the first heat exchanger and the first opening of the second heat exchanger are in communication via an intermediate connecting pipe.

The heat exchange device according to claim 5 or 6, wherein the refrigerant flow direction changing unit includes first to fourth control valves, Wherein the inlet of the first control valve is connected to the first opening of the first heat exchanger and the outlet of the first control valve is connected to the second opening of the second heat exchanger;

a second control valve is coupled between the inlet of the first control valve and the first opening of the first heat exchanger, wherein the inlet of the second control valve is coupled to the inlet of the first control valve and the outlet of the second control valve is first The first opening of the heat exchanger is connected; the inlet of the third control valve is connected between the outlet of the second control valve and the first opening of the first heat exchanger and the outlet of the third control valve and the second heat exchanger Two openings are connected;

The fourth control valve is connected between the outlet of the third control valve and the outlet of the first control valve and the second opening of the second heat exchanger and the inlet of the fourth control valve and the outlet and the second heat exchange of the first control valve The second opening of the device is connected and the outlet of the fourth control valve is connected to the outlet of the third control valve.

The heat exchange device according to claim 7, wherein at least one of the first to fourth control valves is a solenoid valve.

A refrigeration system, comprising: a compressor, an evaporator, a throttle structure, and a condenser, which are sequentially connected, wherein the evaporator is the heat exchange according to any one of claims 1-8 Device.

10. The refrigeration system according to claim 9, further comprising a four-way valve having four orifices, wherein the two orifices are respectively connected to the inlet and the outlet of the compressor, and The two orifices are connected to a condenser and an evaporator, respectively.