CN217464988U - Heat exchange system - Google Patents

Abstract

The utility model provides a heat exchange system, include: compressor, refrigerant and heat transfer device, heat transfer device includes: the first heat exchanger, take over, second heat exchanger and bypass pipe, the import and the takeover intercommunication of bypass pipe, the first export of bypass pipe and second pressure manifold, third pressure manifold or the passageway intercommunication of second pressure manifold to third pressure manifold. The utility model discloses heat transfer system has effectively promoted heat transfer device's defrosting speed through setting up the bypass pipe, is favorable to improving heat transfer device's heat exchange efficiency, promotes heat transfer system's heat transfer performance.

Description

Heat exchange system

Technical Field

The utility model relates to a heat transfer technical field especially relates to a heat transfer system.

Background

In the related art, the heat exchanger has been generally used in an air-conditioning heat exchange system as a condenser or an evaporator, the air-conditioning heat exchange system comprises an indoor unit heat exchanger and an outdoor unit heat exchanger, the heat exchange device can be formed by connecting a plurality of heat exchangers side by side, when the heat exchange device is used as the outdoor unit heat exchanger and under the working condition of the evaporator, the heat exchange device is easy to frost, the frost cannot be quickly melted, the defrosting time is long, and the heat exchange capacity is attenuated due to the frost, so that the heat exchange performance of the heat exchanger is reduced.

SUMMERY OF THE UTILITY MODEL

Therefore, the application provides a heat exchange system, and the heat exchange system effectively promotes heat exchange device's defrosting speed, is favorable to improving heat exchange device's heat exchange efficiency, promotes heat exchange system's heat transfer performance.

According to the utility model discloses an embodiment provides a heat transfer system, include: compressor, refrigerant and heat transfer device, the heat transfer device includes:

a first heat exchanger, the first heat exchanger comprising: the heat exchanger comprises a first heat exchange pipe, a first collecting pipe and a second collecting pipe, wherein the first collecting pipe and the second collecting pipe are arranged at intervals, and the first collecting pipe is positioned above the second collecting pipe in the gravity direction; the first heat exchange tubes are provided with a plurality of heat exchange channels and are arranged at intervals in the length direction of the first collecting pipe, and the first heat exchange tubes are communicated with the first collecting pipe and the second collecting pipe;

a first end of the connecting pipe is directly or indirectly connected with an outlet of the compressor, a second end of the connecting pipe is directly or indirectly connected with the first collecting pipe, or the second end of the connecting pipe is directly or indirectly connected with the second collecting pipe;

a second heat exchanger, the second heat exchanger comprising: the second heat exchange tube, a third collecting pipe and a fourth collecting pipe are arranged at intervals, and the third collecting pipe is positioned above the fourth collecting pipe in the gravity direction; the second heat exchange pipes are provided with heat exchange channels, the number of the second heat exchange pipes is multiple, the multiple second heat exchange pipes are arranged at intervals in the length direction of the third collecting pipe, the second heat exchange pipes are communicated with the third collecting pipe and the fourth collecting pipe, and the first heat exchanger and the second heat exchanger are arranged in parallel; and

the inlet of the bypass pipe is communicated with the connecting pipe, the first outlet of the bypass pipe is communicated with the second collecting pipe, the third collecting pipe or a channel from the second collecting pipe to the third collecting pipe, the heat exchange system comprises a defrosting mode, when the heat exchange device works in the defrosting mode, part of refrigerant flows through the bypass pipe, then enters the second collecting pipe, the third collecting pipe or the channel from the second collecting pipe to the third collecting pipe, and then enters the plurality of second heat exchange pipes.

The utility model discloses heat transfer system is through setting up the bypass pipe for under the defrosting mode, the temperature difference of the refrigerant of first heat exchanger and second heat exchanger reduces, thereby makes the second heat exchanger also can defrost fast, has promoted the defrosting speed of second heat exchanger.

In some embodiments, the second end of the adapter communicates with the first header, the third header communicates with the second header, and the first outlet of the bypass pipe communicates with the second header.

In some embodiments, the second end of the adapter communicates with the first header, the third header communicates with the second header, and the first outlet of the bypass pipe communicates with the third header.

Optionally, the heat exchange device further includes a communicating component, the communicating component communicates the third collecting pipe and the second collecting pipe, the second end of the connecting pipe communicates with the first collecting pipe, and the first outlet of the bypass pipe communicates with the communicating component.

Optionally, the junction of the bypass line and the communicating member is located above 1/3 the elevation of the first heat exchanger.

Optionally, the second end of the connecting pipe is communicated with the second collecting pipe, the third collecting pipe is communicated with the first collecting pipe, and the first outlet of the bypass pipe is communicated with the first collecting pipe.

Optionally, the heat exchange device further comprises a third heat exchanger, and the third heat exchanger comprises: the fifth collecting pipe and the sixth collecting pipe are arranged at intervals, and the fifth collecting pipe is positioned above the sixth collecting pipe in the gravity direction; the third heat exchange tube is provided with a plurality of heat exchange channels, the third heat exchange tubes are arranged at intervals in the length direction of the fifth collecting pipe, the third heat exchange tubes are communicated with the fifth collecting pipe and the sixth collecting pipe, and the third heat exchanger is communicated with the first heat exchanger and the second heat exchanger.

Optionally, the second end of the connecting pipe is communicated with the first collecting pipe, the first outlet of the bypass pipe is communicated with the third collecting pipe, and the fifth collecting pipe is communicated with the second collecting pipe.

Optionally, a second end of the connecting pipe is communicated with the second collecting pipe, a first outlet of the bypass pipe is communicated with the third collecting pipe, and the fifth collecting pipe is communicated with the first collecting pipe.

Optionally, the bypass pipe has a second outlet, the second outlet communicating with the fifth header.

Optionally, a valve for controlling the on-off of the bypass pipe is arranged on the bypass pipe, the valve is closed when the heat exchanger works in a cooling mode and a heating mode, and the valve is opened when the heat exchanger works in a defrosting mode.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of a heat exchange system according to an embodiment of the present invention;

fig. 2a, fig. 2b and fig. 2c are schematic flow diagrams of the refrigerant in the heating mode, the cooling mode and the defrosting mode of the heat exchange device according to the first embodiment of the present invention, respectively;

fig. 3a, fig. 3b and fig. 3c are schematic diagrams illustrating the flow direction of the refrigerant in the heating mode, the cooling mode and the defrosting mode of the heat exchange device according to the second embodiment of the present invention, respectively;

fig. 4a, 4b and 4c are schematic flow diagrams of the refrigerant in the heating mode, the cooling mode and the defrosting mode of the heat exchange device according to the third embodiment of the present invention respectively;

fig. 5a, 5b and 5c are schematic flow diagrams of the refrigerant in the heating mode, the cooling mode and the defrosting mode of the heat exchange device according to the fourth embodiment of the present invention respectively;

fig. 6a, fig. 6b and fig. 6c are schematic flow diagrams of the refrigerant in the heating mode, the cooling mode and the defrosting mode of the heat exchange device according to the fifth embodiment of the present invention, respectively;

fig. 7a, 7b and 7c are schematic flow diagrams of the refrigerant in the heating mode, the cooling mode and the defrosting mode of the heat exchange device according to the sixth embodiment of the present invention, respectively;

fig. 8a, 8b and 8c are schematic flow diagrams of the refrigerant in the heating mode, the cooling mode and the defrosting mode of the heat exchange device according to the seventh embodiment of the present invention, respectively;

fig. 9 is a perspective view of a heat exchanger according to an embodiment of the present invention.

Reference numerals:

10-a first heat exchanger; 11-a first heat exchange tube; 12-a first header; 13-a second header; 14-take over;

20-a second heat exchanger; 21-a second heat exchange tube; 22-third header; 23-a fourth header;

30-a bypass pipe; 31-a valve;

40-a communication member;

a 50-four-way valve;

60-intermediate heat exchanger; 61-an intermediate heat exchange body; 62-fifth header; 63-a sixth header;

70-compressor.

80-indoor heat exchanger; 81-a throttle valve; 82-gas separation device.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1, the present embodiment provides a heat exchange system, including: a compressor 70, a refrigerant and a heat exchange device, wherein the refrigerant circulates between the compressor 70 and the heat exchange device to achieve the purpose of heat exchange. Wherein, the heat exchange system further comprises an indoor heat exchanger 80, a throttle valve 81, an air separation device 82 and a four-way valve 50, and all the components are connected in the manner as shown in fig. 1. The four-way valve 50 has a function of changing a refrigerant flow path to change a mode of a heat exchange system, and the four-way valve 50 may not be provided in a heat exchange system having a single function.

With reference to fig. 9 and fig. 2a to 2c, the heat exchange device mainly includes: a first heat exchanger 10, a nozzle 14, a second heat exchanger 20, and a bypass pipe 30;

the first heat exchanger 10 comprises a first heat exchange tube 11, a first collecting pipe 12 and a second collecting pipe 13, wherein the first collecting pipe 12 and the second collecting pipe are arranged at intervals, and the first collecting pipe 12 is positioned above the second collecting pipe 13 in the gravity direction; first heat exchange tube 11 has the heat transfer passageway, first heat exchange tube 11 is a plurality of, a plurality of first heat exchange tubes 11 interval sets up on the length direction of first pressure manifold 12, first heat exchange tube 11 intercommunication first pressure manifold 12 and second pressure manifold 13 to the refrigerant in first pressure manifold 12 can circulate and carry out the heat transfer with the air to a plurality of first heat exchange tubes 11 in, then get into second pressure manifold 13, heat transfer system is under refrigeration mode operating mode and the mode operating mode that heats, the flow direction of refrigerant in heat transfer device is opposite.

The first end of the connection pipe 14 is directly or indirectly connected with the outlet of the compressor 70, so that the connection pipe 14 can receive the refrigerant output from the compressor 70 or deliver the refrigerant to the compressor 70 in different operation modes of the heat exchange system. The second end of the connecting pipe 14 is directly or indirectly connected with the first collecting pipe 12, or the second end of the connecting pipe 14 is directly or indirectly connected with the second collecting pipe 13; the function of the connection pipe 14 is to communicate the compressor 70 with the first heat exchanger 10, directly or indirectly.

The second heat exchanger 20 may have the same structure as the first heat exchanger 10, and exemplarily, the second heat exchanger 20 includes: the second heat exchange tube 21, the third collecting pipe 22 and the fourth collecting pipe 23 are arranged at intervals, and the third collecting pipe 22 is positioned above the fourth collecting pipe 23 in the gravity direction; the second heat exchange tubes 21 are provided with heat exchange channels, the number of the second heat exchange tubes 21 is multiple, the multiple second heat exchange tubes 21 are arranged at intervals in the length direction of the third collecting pipe 22, the second heat exchange tubes 21 are communicated with the third collecting pipe 22 and the fourth collecting pipe 23, and the first heat exchanger 10 and the second heat exchanger 20 are arranged in parallel; the first heat exchanger 10 communicates with the second heat exchanger 20 so that refrigerant can circulate between the first heat exchanger 10 and the second heat exchanger 20.

An inlet of the bypass pipe 30 is communicated with the adapter pipe 14, so that the refrigerant in the adapter pipe 14 can flow into the bypass pipe 30, the bypass pipe 30 has a first outlet, and the first outlet of the bypass pipe 30 is communicated with the second header 13, or the first outlet of the bypass pipe 30 is communicated with the third header 22 or the passage from the second header 13 to the third header 22, that is, the connection position of the first outlet of the bypass pipe 30 has various schemes as long as the refrigerant flowing into the second heat exchange pipe 21 can not undergo heat exchange.

When the heat exchange device works in the defrosting mode, part of refrigerant flows through the bypass pipe 30, enters the second collecting pipe 13, then enters the third collecting pipe 22 through the communicating part 40, and then enters the plurality of second heat exchange pipes 21 for heat exchange; optionally, a part of the refrigerant after flowing through the bypass pipe 30 may also flow into the channel of the pipe connection part 40 communicating the second collecting pipe 13 to the third collecting pipe 22, so that the refrigerant flowing into the second heat exchanger 20 does not flow out of the first heat exchanger 10, but flows into the second heat exchanger 20 from the compressor 70, and thus the part of the refrigerant flowing out of the bypass pipe 30 does not flow into the first heat exchange pipe 11 to exchange heat with air, thereby reducing heat loss of the part of the refrigerant, and the part of the refrigerant flows into the second heat exchanger 20, which can effectively increase the defrosting speed of the second heat exchanger 20, shorten the defrosting period, facilitate the heat exchange efficiency of the heat exchange device, and improve the heat exchange performance of the heat exchange system.

In some embodiments, referring to fig. 2 a-2 c, the second end of the nozzle 14 communicates with the first header 12, the third header 22 communicates with the second header 13, and the first outlet of the bypass 30 communicates with the second header 13. So that in the defrosting mode, a part of the refrigerant flows into the first header 12 from the joint pipe 14 and further enters the first heat exchange tube 11; a part of the refrigerant directly flows into the second collecting pipe 13 from the bypass pipe 30, and then flows into the third collecting pipe 22 from the second collecting pipe 13, and further enters the second heat exchange pipe 21 to exchange heat with air, and the refrigerant flowing into the second heat exchanger 20 does not flow out of the first heat exchanger 10, but flows into the second heat exchanger 20 from the compressor 70, so that a part of the refrigerant flowing out of the bypass pipe 30 does not flow into the first heat exchange pipe 11 to exchange heat with air, thereby reducing heat loss of the part of the refrigerant, and flowing the part of the refrigerant into the second heat exchanger 20 can effectively improve the defrosting speed of the second heat exchanger 20, shorten the defrosting period, facilitate the improvement of the heat exchange efficiency of the heat exchange device, and improve the heat exchange performance of the heat exchange system.

In some embodiments, referring to fig. 3 a-3 c, the second end of the nozzle 14 is in communication with the first header 12, the third header 22 is in communication with the second header 13, and the first outlet of the bypass conduit 30 is in communication with the third header 22. So that in the defrosting mode, a part of the refrigerant flows into the first header 12 from the joint pipe 14 and further enters the first heat exchange tube 11; a part of the refrigerant directly enters the third collecting pipe 22 from the bypass pipe 30, and then enters the second heat exchange pipe 21 for heat exchange, and the refrigerant flowing into the second heat exchanger 20 does not flow out of the first heat exchanger 10, but flows into the second heat exchanger 20 from the compressor 70, so that a part of the refrigerant flowing out of the bypass pipe 30 does not flow into the first heat exchange pipe 11 for heat exchange with air, thereby reducing the heat loss of the part of the refrigerant, and the part of the refrigerant flows into the second heat exchanger 20, which can effectively improve the defrosting speed of the second heat exchanger 20, shorten the defrosting period, facilitate the improvement of the heat exchange efficiency of the heat exchange device, and improve the heat exchange performance of the heat exchange system.

In some embodiments, referring to fig. 4 a-4 c, the heat exchange device further comprises a communication component 40, and the communication component 40 may be a communication pipe. The communicating part 40 communicates the third header 22 with the second header 13, the second end of the connecting pipe 14 communicates with the first header 12, and the first outlet of the bypass pipe 30 communicates with the communicating part 40. So that in the defrosting mode, a part of the refrigerant flows into the first header 12 from the joint pipe 14 and further enters the first heat exchange tube 11; a part of the refrigerant directly enters the communicating part 40 from the bypass pipe 30, and then enters the third collecting pipe 22, and then enters the second heat exchanging pipe 21 for heat exchange, and the refrigerant flowing into the second heat exchanger 20 does not flow out of the first heat exchanger 10, but flows into the second heat exchanger 20 from the compressor 70, so that a part of the refrigerant flowing out of the bypass pipe 30 does not flow into the first heat exchanging pipe 11 for heat exchange with air, thereby reducing the heat loss of the part of the refrigerant, and flows into the second heat exchanger 20, the defrosting speed of the second heat exchanger 20 can be effectively increased, the defrosting period is shortened, the heat exchanging efficiency of the heat exchanging device is improved, and the heat exchanging performance of the heat exchanging system is improved.

Further, the junction of the bypass pipe 30 and the communication part 40 is located above 1/3 of the height of the first heat exchanger 10. By connecting the bypass pipe 30 to this position, the defrosting speed of the second heat exchanger 20 can be further increased.

In some embodiments, referring to fig. 5 a-5 c, the second end of the nipple 14 communicates with the second header 13, the third header 22 communicates with the first header 12, and the first outlet of the bypass 30 communicates with the first header 12. That is, in the present embodiment, the connection position of the adapter 14 is changed, and thus the connection position of the first outlet of the bypass pipe 30 is also adjusted accordingly. When the second end of the connecting pipe 14 is communicated with the second collecting pipe 13 and the third collecting pipe 22 is communicated with the first collecting pipe 12, the first outlet of the bypass pipe 30 can also be communicated with the communicating part 40 and also can be communicated with the third collecting pipe 22 to communicate the first collecting pipe 12 with the third collecting pipe 22, so that the on-way resistance of the refrigerant can be reduced, the flow speed of the refrigerant can be increased, and the heat loss of the refrigerant can be reduced.

In some embodiments, the heat exchange device further includes a third heat exchanger 60, the third heat exchanger 60 is located between the first heat exchanger 10 and the second heat exchanger 20, the third heat exchanger 60 may have the same structure as the first heat exchanger 10 and the second heat exchanger 20, and the third heat exchanger 60 exemplarily includes: the third heat exchange tube 61, a fifth collecting pipe 62 and a sixth collecting pipe 63, wherein the fifth collecting pipe 62 and the sixth collecting pipe 63 are arranged at intervals, and the fifth collecting pipe 62 is positioned above the sixth collecting pipe 63 in the gravity direction; the third heat exchange tubes 61 are provided with heat exchange channels, the number of the third heat exchange tubes 61 is multiple, the multiple third heat exchange tubes 61 are arranged at intervals in the length direction of the fifth collecting pipe 62, the third heat exchange tubes 61 are communicated with the fifth collecting pipe 62 and the sixth collecting pipe 63, and the third heat exchanger 60 is communicated with the first heat exchanger 10 and the second heat exchanger 20.

Specifically, the second header 13 and the fifth header 62 are communicated by a communicating member 40, and the sixth header 63 and the third header 22 are communicated by a communicating member 40. More third heat exchangers 60 can also be provided on this basis.

In some embodiments, referring to fig. 6 a-6 c and 7 a-7 c, where a third heat exchanger 60 is provided, the second end of the nozzle 14 communicates with the first header 12, the first outlet of the bypass pipe 30 communicates with the third header 22, and the fifth header 62 communicates with the second header 13. Through setting up bypass pipe 30, under the defrosting mode, can effectively promote the defrosting speed of second heat exchanger 20, shorten the defrosting cycle, be favorable to promoting heat transfer device's heat exchange efficiency, promoted heat exchange system's heat transfer performance.

In some embodiments, referring to fig. 6 a-6 c, the bypass conduit 30 also has a second outlet in communication with the fifth header 62. Therefore, in the defrosting mode, the refrigerant simultaneously enters the third collecting pipe 22 and the fifth collecting pipe 62 through the bypass pipe 30, so that the defrosting speeds of the second heat exchanger 20 and the third heat exchanger 60 are both increased, the defrosting period is shortened, the heat exchange efficiency of the heat exchange device is favorably improved, and the heat exchange performance of the heat exchange system is improved.

In some embodiments, referring to fig. 8 a-8 c, where a third heat exchanger 60 is provided, the second end of the nozzle 14 communicates with the second header 13, the first outlet of the bypass 30 communicates with the third header 22, the fifth header 62 communicates with the first header 12, and the sixth header 63 communicates with the third header 22. Through setting up bypass pipe 30, under the defrosting mode, can effectively promote the defrosting speed of second heat exchanger 20, shorten the defrosting cycle, be favorable to promoting heat transfer efficiency of heat transfer device, promoted heat transfer system's heat transfer performance.

In some embodiments, a valve 31 is disposed on the bypass pipe 30 to control the on/off of the bypass pipe 30, when the heat exchanger operates in the cooling mode and the heating mode, the valve 31 is closed, so that the refrigerant cannot pass through the bypass pipe 30, and when the heat exchanger operates in the defrosting mode, the valve 31 is opened, so that the refrigerant can pass through the bypass pipe 30.

Illustratively, the valve 31 may be an electrically operated valve, so that its on-off state can be controlled by an electric circuit.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (11)

1. A heat exchange system, comprising: compressor, refrigerant and heat transfer device, the heat transfer device includes:

a first heat exchanger, the first heat exchanger comprising: the heat exchanger comprises a first heat exchange pipe, a first collecting pipe and a second collecting pipe, wherein the first collecting pipe and the second collecting pipe are arranged at intervals, and the first collecting pipe is positioned above the second collecting pipe in the gravity direction; the first heat exchange tubes are provided with a plurality of heat exchange channels and are arranged at intervals in the length direction of the first collecting pipe, and the first heat exchange tubes are communicated with the first collecting pipe and the second collecting pipe;

a first end of the connecting pipe is directly or indirectly connected with an outlet of the compressor, a second end of the connecting pipe is directly or indirectly connected with the first collecting pipe, or the second end of the connecting pipe is directly or indirectly connected with the second collecting pipe;

a second heat exchanger, the second heat exchanger comprising: the second heat exchange tube, a third collecting pipe and a fourth collecting pipe are arranged at intervals, and the third collecting pipe is positioned above the fourth collecting pipe in the gravity direction; the second heat exchange tubes are provided with heat exchange channels and are arranged at intervals in the length direction of the third collecting pipe, the second heat exchange tubes are communicated with the third collecting pipe and the fourth collecting pipe, and the first heat exchanger and the second heat exchanger are arranged in parallel; and

the inlet of the bypass pipe is communicated with the connecting pipe, the first outlet of the bypass pipe is communicated with the second collecting pipe, the third collecting pipe or a channel from the second collecting pipe to the third collecting pipe, the heat exchange system comprises a defrosting mode, when the heat exchange device works in the defrosting mode, part of refrigerant flows through the bypass pipe, then enters the second collecting pipe, the third collecting pipe or the channel from the second collecting pipe to the third collecting pipe, and then enters the plurality of second heat exchange pipes.

2. The heat exchange system of claim 1, wherein the second end of the nozzle is in communication with the first header, the third header is in communication with the second header, and the first outlet of the bypass line is in communication with the second header.

3. The heat exchange system of claim 1, wherein the second end of the nozzle is in communication with the first header, the third header is in communication with the second header, and the first outlet of the bypass line is in communication with the third header.

4. The heat exchange system of claim 1, wherein the heat exchange device further comprises a communication part, the communication part communicates the third header with the second header, the second end of the connection pipe communicates with the first header, and the first outlet of the bypass pipe communicates with the communication part.

5. The heat exchange system of claim 4 wherein the junction of the bypass line and the communication member is located above 1/3 the height of the first heat exchanger.

6. The heat exchange system of claim 1, wherein the second end of the adapter communicates with the second header, the third header communicates with the first header, and the first outlet of the bypass line communicates with the first header.

7. The heat exchange system of any one of claims 1 to 6, wherein the heat exchange device further comprises a third heat exchanger comprising: the fifth collecting pipe and the sixth collecting pipe are arranged at intervals, and the fifth collecting pipe is positioned above the sixth collecting pipe in the gravity direction; the third heat exchange tube is provided with a plurality of heat exchange channels, the third heat exchange tubes are arranged at intervals in the length direction of the fifth collecting pipe, the third heat exchange tubes are communicated with the fifth collecting pipe and the sixth collecting pipe, and the third heat exchanger is communicated with the first heat exchanger and the second heat exchanger.

8. The heat exchange system of claim 7, wherein the second end of the adapter communicates with the first header, the first outlet of the bypass pipe communicates with the third header, and the fifth header communicates with the second header.

9. The heat exchange system of claim 7, wherein the second end of the adapter is in communication with the second header, the first outlet of the bypass line is in communication with the third header, and the fifth header is in communication with the first header.

10. The heat exchange system of claim 8 or 9, wherein the bypass pipe has a second outlet, the second outlet communicating with the fifth header.

11. The heat exchange system of any one of claims 1 to 6, wherein a valve is provided on the bypass line to control the bypass line to be opened and closed, the valve is closed when the heat exchange device is operated in the cooling mode and the heating mode, and the valve is open when the heat exchange device is operated in the defrosting mode.

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