CN216769619U

CN216769619U - Heat exchange assembly, outdoor unit and air conditioning system

Info

Publication number: CN216769619U
Application number: CN202220404365.0U
Authority: CN
Inventors: 郭晓颖; 陈君; 袁前; 赵尤计
Original assignee: Aux Air Conditioning Co Ltd; Ningbo Aux Electric Co Ltd
Current assignee: Aux Air Conditioning Co Ltd; Ningbo Aux Electric Co Ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2022-06-17
Anticipated expiration: 2032-02-25

Abstract

The utility model provides a heat exchange assembly, an outdoor unit and an air conditioning system, and relates to the technical field of air conditioners. The heat exchange assembly provided by the embodiment of the application comprises a main pipeline, a heat exchange pipe set, a first heat exchange pipe, a second heat exchange pipe, a first bypass pipeline and a second bypass pipeline, wherein the heat exchange pipe set, the first heat exchange pipe and the second heat exchange pipe are sequentially arranged on the main pipeline. Through rationally setting up at least one two-way choke valve in first bypass pipeline and second bypass pipeline, when realizing refrigeration, heating different flow paths, still can improve refrigerant flow, velocity of flow and the problem of frosting through the flow control refrigerant of two-way choke valve, can use in a flexible way, satisfy user's user demand. The embodiment of the application provides an outdoor unit and air conditioning system, contains the heat exchange assembly that this application provided.

Description

Heat exchange assembly, outdoor unit and air conditioning system

Technical Field

The utility model relates to the technical field of air conditioners, in particular to a heat exchange assembly, an outdoor unit and an air conditioning system.

Background

The conventional heat pump air conditioner has basic functions of realizing refrigeration, heating and the like, and when a common air conditioner on the market is in a refrigeration mode and a heating mode, the flow paths of the heat exchange assemblies are the same and only the directions are opposite. In practice, however, the heat exchange module has different requirements on its structure when it is used as a condenser or an evaporator. In other words, the single flow path arrangement makes it difficult to achieve the performance of the heat exchange module in the case of being different between the evaporator and the condenser. Because the existing air conditioning system adopts the same flow path under the conditions of refrigeration and heating, the flow path in the heat exchange assembly is difficult to adjust according to specific requirements, and the flexibility is poor, so that the performance of the air conditioner is limited.

SUMMERY OF THE UTILITY MODEL

The utility model solves the problem of how to improve the use flexibility of the heat exchange assembly so as to meet the performance requirements under different conditions.

To solve the above problems, in a first aspect, the present invention provides a heat exchange assembly for circulating a refrigerant of an air conditioning system, the heat exchange assembly comprising a main pipeline, a heat exchange pipe set, a first heat exchange pipe and a second heat exchange pipe, the main pipeline having a first end and a second end, the heat exchange pipe set, the first heat exchange pipe and the second heat exchange pipe being sequentially arranged on the main pipeline from the first end to the second end, the heat exchange assembly further comprising a first bypass pipeline and a second bypass pipeline, one end of the first bypass pipeline being connected between the first heat exchange pipe and the second heat exchange pipe, the other end being connected between the heat exchange pipe set and the first end of the main pipeline, one end of the second bypass pipeline being connected between the second end of the main pipeline and the second heat exchange pipe, the other end being connected between the first heat exchange pipe and the heat exchange pipe set, a first valve being disposed on the first bypass pipeline, a second valve being disposed on the second bypass pipeline, at least one of the first valve and the second valve is a two-way throttle valve.

In the heat exchange assembly of the embodiment of the application, the refrigerant may flow from the first end of the main pipeline to the second end (for short, in a first flow manner), or may flow from the second end of the main pipeline to the first end (for short, in a second flow manner), and at least one of the first valve and the second valve is a two-way throttle valve, therefore, in different flow manners, not only may the refrigerant flow path mode (for example, the serial-parallel relation of the refrigerant in the heat exchange tube set, the first heat exchange tube, and the second heat exchange tube) in the heat exchange assembly be adjusted by adjusting the on-off state of (at least one of) the first valve and the second valve, but also the flow distribution in the pipeline may be adjusted by adjusting the opening degree of the two-way throttle valve. Under the condition that the heat exchange tube set, the first heat exchange tube and the second heat exchange tube are connected in parallel, pressure loss is small when a refrigerant flows through the heat exchange tube set, the first heat exchange tube and the second heat exchange tube. In the air conditioning system, the condenser is positioned at a high-pressure end, the path of the required refrigerant in the condenser is longer, and the flow speed is faster; and the evaporator is at the low pressure end, and the on-way resistance of the evaporator is required to be small. The heat exchange assembly provided by the embodiment of the application can provide different refrigerant flow paths under different working conditions, and when the heat exchange assembly is used as an evaporator, the refrigerant flow paths in the heat exchange tube set, the first heat exchange tube and the second heat exchange tube can be connected in parallel; when the heat exchange tube set is used as a condenser, the flow paths in the heat exchange tube set, the first heat exchange tube and the second heat exchange tube can be connected in series. Therefore, the heat exchange assembly can give consideration to the performance under two working conditions. In addition, at least two heat exchange tubes in the heat exchange tube set are kept in parallel connection under two different working conditions, so that the phenomenon that the on-way resistance of the whole heat exchange assembly is too large when the whole heat exchange assembly is used as a condenser is avoided, and the heat exchange efficiency of a high-temperature gaseous refrigerant at the front section of the heat exchange assembly is improved to a certain degree. In addition, the flow distribution in the pipeline is adjusted by adjusting the opening of the two-way throttle valve, so that the heat exchange requirements under different conditions are met, or the frosting problem is improved.

In an alternative embodiment, the first valve is a one-way valve and the second valve is a two-way throttle valve. The first valve is set as a one-way valve, so that the first bypass pipeline can naturally present different flow states under two different flow modes of the refrigerant, and the series and parallel switching of the flow paths is realized.

In an alternative embodiment, the first valve only allows the refrigerant to flow from one end of the first bypass line connected between the first heat exchange tube and the second heat exchange tube to the other end. In this embodiment, due to the restriction of the first valve, in the first flow mode, the refrigerant must pass through the heat exchange tube set before flowing to the first heat exchange tube and the second heat exchange tube, so that the flow path of the refrigerant is increased.

In an alternative embodiment, the first valve is an electrically operated shut-off valve and the second valve is a two-way throttle valve. In this embodiment, the first valve uses an electric stop valve, which can more effectively stop the flow compared with a one-way valve, and can be opened or closed in a controlled manner, so that the flexibility is better. When the refrigerant flows in the first flow mode, the first valve can be closed; when the refrigerant flows in the second flow mode, the first valve is opened, and the first valve can realize the function similar to that of the one-way valve.

In an alternative embodiment, the heat exchange tube bank comprises at least two heat exchange tubes arranged in parallel.

In an alternative embodiment, the heat exchange tubes in the first heat exchange tube, the second heat exchange tube and the heat exchange tube set are all coiled tubes. Set up each heat exchange tube into the coiled pipe, can reduce the space and occupy, guarantee heat exchange efficiency simultaneously.

In an alternative embodiment, the first heat exchange tube, the second heat exchange tube and the heat exchange tubes in the heat exchange tube group are in the same plane. The first heat exchange tube, the second heat exchange tube and the heat exchange tubes in the heat exchange tube set are arranged on the same plane, so that the blower can be conveniently swept, and the heat exchange efficiency is prevented from being poor due to overlapping.

In an optional embodiment, a multi-way valve is arranged on the main pipeline, the multi-way valve is positioned between the heat exchange tube set and the first heat exchange tube, and one end of the second bypass pipeline is connected to the multi-way valve. The stability of the connection between the lines can be improved by means of a multi-way valve.

In a second aspect, the present invention provides an outdoor unit comprising the heat exchange assembly of any one of the preceding embodiments.

In a third aspect, the present invention provides an air conditioning system comprising the heat exchange assembly of any one of the preceding embodiments.

Drawings

FIG. 1 is a schematic view of an air conditioning system in a cooling mode according to an embodiment of the present application;

FIG. 2 is a schematic view of an air conditioning system in an embodiment of the present application in a heating mode;

FIG. 3 is a schematic view of a heat exchange assembly as a condenser in one embodiment of the present application;

FIG. 4 is a schematic view of a heat exchange assembly as an evaporator according to an embodiment of the present application.

Description of reference numerals: 010-air conditioning systems; 100-outdoor heat exchanger; 200-a compressor; 300-a reversing valve; 400-indoor heat exchanger; 500-a heat exchange assembly; 510-main line; 511-a first end; 512-second end; 520-heat exchange tube set; 530-a first heat exchange tube; 540-a second heat exchange tube; 550-a first bypass line; 551-a first valve; 560-a second bypass line; 561-a second valve; 570-a multi-way valve; 600-a throttle assembly.

Detailed Description

When the heat exchange assembly is used as an evaporator, the heat exchange assembly is positioned at a low-pressure end, and the circulation of a refrigerant is relatively weak in power, so that the on-way pressure loss of the heat exchange assembly is often required to be reduced, more parallel flow paths are prone to be involved during design, the heat exchange efficiency is improved, and the pressure loss is also reduced. However, when the condenser is used as a condenser, the condenser is positioned at a high-pressure end, and the flow velocity of the refrigerant is reduced due to the increase of the number of the parallel flow paths, so that the performance is reduced, and the cost is increased. However, the existing heat exchange assembly, whether used as a condenser or an evaporator, uses the same set of flow paths, and only the flow directions are opposite. This just leads to current heat exchange assembly to be difficult to compromise the performance under two different operating modes. In addition, in the existing heat exchange assembly, if the branch lines connected in parallel exist, the flow distribution on each branch line is also difficult to adjust, so that the flexibility of flow path control of the heat exchange assembly is poor, and the use requirement is difficult to meet.

In order to solve the above problems in the prior art, an embodiment of the present application provides a heat exchange assembly, which adjusts a flow path form (including a structure and a flow distribution of a flow path) in the heat exchange assembly by reasonably setting a bypass line and a valve on the bypass line in a pipeline, so as to adapt to different working conditions and meet different performance requirements. In addition, this application embodiment still provides an outdoor machine and air conditioning system, contains the heat exchange assemblies that this application provided.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 1 is a schematic diagram of an air conditioning system 010 in a cooling mode according to an embodiment of the present application; fig. 2 is a schematic diagram of an air conditioning system 010 in a heating mode according to an embodiment of the present application. As shown in fig. 1, the air conditioning system 010 includes a compressor 200, an outdoor heat exchanger 100, a throttle assembly 600, and an indoor heat exchanger 400, which are sequentially connected to form a loop. The heat exchange assemblies 500 are disposed in both the indoor heat exchanger 400 and the outdoor heat exchanger 100, and the refrigerant undergoes a phase change in the heat exchange assemblies 500 to exchange heat with the environment. In order to switch between the cooling and heating modes, the air conditioning system 010 further includes a switching valve 300, and the switching valve 300 switches the state such that the discharge end of the compressor 200 can selectively supply the high-pressure gaseous refrigerant to the indoor heat exchanger 400 or the outdoor heat exchanger 100. In this embodiment, the air conditioning system 010 can be divided into an outdoor unit and an indoor unit, where the outdoor unit includes a compressor 200, an outdoor heat exchanger 100, and a reversing valve 300; the indoor unit includes an indoor heat exchanger 400; the throttling assembly 600 may be provided in the indoor unit or the outdoor unit as needed. Of course, the air conditioning system 010 may further include more components (such as a fan) for implementing the air conditioning function, which will not be described herein again.

As shown in fig. 1, the air conditioning system 010 is in a cooling mode, and the discharge end of the compressor 200 feeds the high-pressure gaseous refrigerant to the outdoor heat exchanger 100, and the high-pressure gaseous refrigerant releases heat and condenses at the outdoor heat exchanger 100, so that the outdoor heat exchanger 100 is a condenser. The high-pressure liquid refrigerant sent from the outdoor heat exchanger 100 passes through the throttling assembly 600 and then is changed into a low-pressure liquid refrigerant, and then enters the indoor heat exchanger 400. The indoor heat exchanger 400 is an evaporator, and a low-pressure liquid refrigerant is evaporated and absorbs heat in the indoor heat exchanger 400 to be changed into a low-pressure gaseous refrigerant, and then is sucked into the compressor 200, thereby completing one cycle.

On the contrary, as shown in fig. 2, when the air conditioning system 010 is in the heating mode, the discharge end of the compressor 200 feeds the high-pressure gaseous refrigerant to the indoor heat exchanger 400, and the high-pressure gaseous refrigerant releases heat and condenses at the indoor heat exchanger 400, so that the indoor heat exchanger 400 is a condenser. The high-pressure liquid refrigerant sent from the indoor heat exchanger 400 passes through the throttling assembly 600 and then is changed into a low-pressure liquid refrigerant, and then enters the outdoor heat exchanger 100. The outdoor heat exchanger 100 is an evaporator, and a low-pressure liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 100 to be changed into a low-pressure gaseous refrigerant, which is then sucked into the compressor 200 to complete one cycle.

As can be seen from the operation principle of the air conditioning system 010, the evaporator (the outdoor heat exchanger 100 in the heating mode and the indoor heat exchanger 400 in the cooling mode) is always at the low-pressure end, so that the power of the refrigerant flowing therein is weak; the condenser is always located at the high-pressure end and is located at the downstream of the exhaust side of the compressor 200, and the pressure of the refrigerant inside the condenser is high, and the flowing capacity is high. Therefore, the evaporator needs smaller on-way pressure resistance, and the difficulty in flowing of the refrigerant is avoided, so that the flow path of the refrigerant is not suitable to be too long; the condenser can properly increase the length of the flow path due to high pressure, so that the refrigerant can be fully cooled. It is therefore necessary to arrange the heat exchange assembly 500 in the heat exchanger so that it has a certain flexibility of use.

FIG. 3 is a schematic diagram of a heat exchange assembly 500 as a condenser in one embodiment of the present application; fig. 4 is a schematic diagram of a heat exchange assembly 500 as an evaporator according to an embodiment of the present application. As shown in fig. 3 and 4, the main pipe 510 and the heat exchange pipe group 520, the heat exchange assembly 500 further comprises a first bypass line 550 and a second bypass line 560, one end of the first bypass line 550 is connected between the first heat exchange tube 530 and the second heat exchange tube 540, the other end of the first bypass line 550 is connected between the heat exchange tube bank 520 and the first end 511 of the main line 510, one end of the second bypass line 560 is connected between the second end 512 of the main line 510 and the second heat exchange tube 540, the other end of the second bypass line 560 is connected between the first heat exchange tube 530 and the heat exchange tube bank 520, the first bypass line 550 is provided with a first valve 551, the second bypass line 560 is provided with a second valve 561, and at least one of the first valve 551 and the second valve 561 is a bidirectional throttle valve.

In the heat exchange assembly 500 of the embodiment of the present application, the refrigerant may flow from the first end 511 to the second end 512 of the main pipeline 510 (referred to as a first flow manner for short), or may flow from the second end 512 to the first end 511 of the main pipeline 510 (referred to as a second flow manner for short), because at least one of the first valve 551 and the second valve 561 is a two-way throttle valve, under different flow manners, not only can the refrigerant flow path mode (for example, the serial-parallel relation of the refrigerant in the heat exchange tube group 520, the first heat exchange tube 530, and the second heat exchange tube 540) in the heat exchange assembly 500 be adjusted by adjusting the open/close state of (at least one of) the first valve 551 and the second valve 561, but also can the flow distribution in the pipeline be adjusted by adjusting the opening degree of the two-way throttle valve. In the case that the heat exchange tube set 520, the first heat exchange tube 530 and the second heat exchange tube 540 are connected in parallel, when a refrigerant flows through the three tubes, pressure loss is relatively small. In the air conditioning system 010, the condenser is located at a high-pressure end, the path of the required refrigerant in the condenser is longer, and the flow rate is faster; and the evaporator is at the low pressure end, and the on-way resistance of the evaporator is required to be small. The heat exchange assembly 500 provided in the embodiment of the present application can provide different refrigerant flow paths under different working conditions, and when the heat exchange assembly is used as an evaporator, the refrigerant flow paths in the heat exchange tube group 520, the first heat exchange tube 530, and the second heat exchange tube 540 are connected in parallel; when it functions as a condenser, the flow paths among the heat exchange tube group 520, the first heat exchange tube 530, and the second heat exchange tube 540 may be connected in series. Therefore, the heat exchange assembly 500 can achieve the performance under two working conditions. In addition, at least two heat exchange tubes in the heat exchange tube set 520 are all kept in parallel under two different working conditions, so that the problem that the on-way resistance of the whole heat exchange assembly 500 is too large when the whole heat exchange assembly is used as a condenser is avoided, and the heat exchange efficiency of a high-temperature gaseous refrigerant at the front section of the heat exchange assembly 500 is improved to a certain degree. In addition, the flow distribution in the pipeline is adjusted by adjusting the opening of the two-way throttle valve, so that the heat exchange requirements under different conditions are met, or the frosting problem is improved.

Specifically, in this embodiment, the first valve 551 is a one-way valve, and the second valve 561 is a two-way throttle valve. The first valve 551 is a one-way valve, so that the first bypass line 550 naturally exhibits different flow states under two different flow modes, thereby realizing the switching of the flow paths in series and in parallel. Specifically, the first valve 551 only allows the refrigerant to flow from one end of the first bypass line 550 connected between the first heat exchanging tube 530 and the second heat exchanging tube 540 to the other end. Due to the restriction of the first valve 551, in the first flow mode (from the first end 511 to the second end 512), the refrigerant must pass through the heat exchange tube set 520 before flowing to the first heat exchange tube 530 and the second heat exchange tube 540, so that the refrigerant flow path has a serial structure and the path is increased. The pressure loss of the refrigerant passing through the three is relatively large. Since the second valve 561 is a two-way throttle valve, the second valve 561 can be completely closed at this time, and all the refrigerants sequentially pass through the heat exchange tube set 520, the first heat exchange tube 530 and the second heat exchange tube 540; of course, the second valve 561 may be adjusted to a suitable opening degree, and a part of the refrigerant sent from the heat exchange tube set 520 flows into the first heat exchange tube 530 and the second heat exchange tube 540, and another part of the refrigerant directly flows from the second bypass line 560 to the second end 512 of the main line 510. The opening degree of the second valve 561 can be adjusted, so that the flow distribution in the pipeline can be changed, and the flexibility of the heat exchange assembly 500 is realized. In the second flow mode, the second valve 561 needs to maintain a certain opening degree, and at this time, since the first valve 551 is unblocked, the refrigerant flow paths in the heat exchange tube set 520, the first heat exchange tube 530, and the second heat exchange tube 540 are in a parallel state. When the refrigerant flows through the three components, the pressure loss is relatively small.

In the air conditioning system 010, the condenser is positioned at a high-pressure end, the path of the required refrigerant in the condenser is longer, and the flow speed is faster; and the evaporator is at the low pressure end, and the on-way resistance of the evaporator is required to be small. The heat exchange assembly 500 can provide two sets of different flow paths under different working conditions, and when the heat exchange assembly is used as an evaporator, the heat exchange tube group 520, the first heat exchange tube 530 and the second heat exchange tube 540 are connected in parallel; when the heat exchange assembly is used as a condenser, the heat exchange tube set 520, the first heat exchange tube 530 and the second heat exchange tube 540 are connected in series, so that the heat exchange assembly 500 can achieve the performance under two working conditions. And the flow rate can be adjusted by adjusting the opening degree of the second valve 561, so as to better meet the use requirement.

In alternative embodiments, the first valve 551 may be an electric shut-off valve, and the second valve 561 may be a two-way throttle valve. The electric stop valve can more effectively stop water relative to the one-way valve, can be opened or closed in a controlled manner, and has better flexibility. When the refrigerant flows in the first flow mode, the first valve 551 can be closed; when the refrigerant flows in the second flow mode, the first valve 551 is opened, and the first valve 551 can perform a similar function as a check valve.

In the present embodiment, the heat exchange tube set 520 includes at least two heat exchange tubes arranged in parallel. Of course, the number of the heat exchange tubes of the heat exchange tube set 520 can be increased or decreased as required.

Optionally, the heat exchange tubes in the first heat exchange tube 530, the second heat exchange tube 540 and the heat exchange tube set 520 are all serpentine tubes. Set up each heat exchange tube into the coiled pipe, can reduce the space and occupy, guarantee heat exchange efficiency simultaneously. Further, the heat exchange pipes in the first heat exchange pipe 530, the second heat exchange pipe 540 and the heat exchange pipe group 520 are in the same plane. The heat exchange tubes in the first heat exchange tube 530, the second heat exchange tube 540 and the heat exchange tube set 520 are arranged on the same plane, so that the blower can be conveniently swept, and the heat exchange efficiency is prevented from being poor due to overlapping.

In this embodiment, a multi-way valve 570 is disposed on the main pipe 510, the multi-way valve 570 is disposed between the heat exchange tube set 520 and the first heat exchange tube 530, and a downstream end of the second bypass pipe 560 is connected to the multi-way valve 570. The stability of the connection between the lines can be improved by using the multi-way valve 570. Specifically, in the present embodiment, since the heat exchange tube set 520 includes two heat exchange tubes connected in parallel, the multi-way valve 570 is a four-way valve, and four ports of the four-way valve are respectively communicated with the second bypass pipeline 560, the two heat exchange tubes of the heat exchange tube set 520, and the main pipeline 510. The heat exchange tubes in the heat exchange tube set 520 are all kept in parallel under two different working conditions, so that the problem that the on-way resistance of the whole heat exchange assembly 500 is too large when the whole heat exchange assembly is used as a condenser is avoided, and the heat exchange efficiency of a high-temperature gaseous refrigerant at the front section of the heat exchange assembly 500 is improved to a certain degree.

In other alternative embodiments of the present application, the types of the first valve 551 and the second valve 561 may be reversed, and even the first valve 551 and the second valve 561 may both adopt bidirectional throttles, which can also realize the switching of the flow path modes and the adjustment of the flow rate.

In the outdoor heat exchanger 100 of the air conditioning system 010 provided in the embodiment of the present application, the heat exchange assembly 500 is included, a first end 511 of a main pipeline 510 of the heat exchange assembly 500 is communicated with the compressor 200 (through the reversing valve 300), and a second end 512 of the main pipeline 510 is connected with the throttling assembly 600. When the air conditioning system 010 is in a cooling mode and the heat exchange assembly 500 serves as a condenser, the first end 511 of the main pipeline 510 is connected to the exhaust side of the compressor 200, a gaseous refrigerant enters from the first end 511 according to a first flow mode, a liquid refrigerant flows out from the second end 512, the refrigerant needs to pass through the heat exchange tube set 520, and then at least part of the refrigerant can enter the first heat exchange tube 530 and the second heat exchange tube 540. When the air conditioning system 010 is in a heating mode, the heat exchange assembly 500 serves as an evaporator, the first end 511 of the main pipeline 510 is connected to the suction side of the compressor 200, a low-pressure liquid refrigerant enters from the second end 512, a low-pressure gaseous refrigerant is sent out from the first end 511, and the flow path is a parallel flow path. Therefore, the outdoor unit of the air conditioning system 010 has a better performance because the heat exchange unit 500 always maintains a reasonable flow path form regardless of the cooling mode or the heating mode.

In addition, in an alternative embodiment of the present application, the heat exchange assembly 500 of the indoor heat exchanger 400 may also adopt the heat exchange assembly 500 provided in the above embodiment of the present application.

To sum up, the heat exchange assembly 500 provided in the embodiment of the present application reasonably sets at least one bidirectional throttle valve on the first bypass line 550 and the second bypass line 560, so that the flow of the refrigerant can be controlled by the bidirectional throttle valve while different flow paths for cooling and heating are realized, and the flow rate and the frosting of the refrigerant can be improved.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A heat exchange assembly for circulating a refrigerant of an air conditioning system (010), the heat exchange assembly (500) comprising a main pipeline (510), a heat exchange tube set (520), a first heat exchange tube (530) and a second heat exchange tube (540), the main pipeline (510) having a first end (511) and a second end (512), the heat exchange tube set (520), the first heat exchange tube (530) and the second heat exchange tube (540) being sequentially arranged on the main pipeline (510) from the first end (511) to the second end (512), the heat exchange assembly (500) further comprising a first bypass pipeline (550) and a second bypass pipeline (560), one end of the first bypass pipeline (550) being connected between the first heat exchange tube (530) and the second heat exchange tube (540), the other end being connected between the heat exchange tube set (520) and the first end (511) of the main pipeline (510), one end of the second bypass pipeline (560) is connected between the second end (512) of the main pipeline (510) and the second heat exchange pipe (540), the other end of the second bypass pipeline is connected between the first heat exchange pipe (530) and the heat exchange pipe set (520), a first valve (551) is arranged on the first bypass pipeline (550), a second valve (561) is arranged on the second bypass pipeline (560), and at least one of the first valve (551) and the second valve (561) is a bidirectional throttle valve.

2. The heat exchange assembly of claim 1, wherein the first valve (551) is a one-way valve and the second valve (561) is a two-way throttle valve.

3. A heat exchange assembly according to claim 2, wherein the first valve (551) only allows refrigerant to flow from one end to the other end where the first bypass line (550) is connected between the first heat exchange tube (530) and the second heat exchange tube (540).

4. The heat exchange assembly of claim 1, wherein the first valve (551) is an electrically operated shutoff valve and the second valve (561) is a two-way throttle valve.

5. A heat exchange assembly according to claim 1, wherein the heat exchange tube bank (520) comprises at least two heat exchange tubes arranged in parallel.

6. The heat exchange assembly of claim 1, wherein the first heat exchange tube (530), the second heat exchange tube (540), and the heat exchange tubes in the heat exchange tube bank (520) are each serpentine tubes.

7. The heat exchange assembly of claim 6, wherein the first heat exchange tube (530), the second heat exchange tube (540), and the heat exchange tubes of the heat exchange tube bank (520) are in the same plane.

8. A heat exchange assembly according to claim 1, wherein a multi-way valve (570) is provided on the main line (510), the multi-way valve (570) being located between the heat exchange tube bank (520) and the first heat exchange tube (530), and one end of the second bypass line (560) is connected to the multi-way valve (570).

9. An outdoor unit, characterized in that it comprises a heat exchange assembly (500) according to any one of claims 1 to 8.

10. An air conditioning system, characterized in that it comprises a heat exchange assembly (500) according to any one of claims 1 to 8.