CN216769618U

CN216769618U - Heat exchange assembly, outdoor unit and air conditioning system

Info

Publication number: CN216769618U
Application number: CN202220404362.7U
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 comprises a first main pipeline, a first pipe group, a second pipe group and a second main pipeline which are sequentially connected, and further comprises a first bypass pipeline and a second bypass pipeline, wherein valves (comprising two-way throttle valves) on the bypass pipeline and the second main pipeline are reasonably arranged, the structure and the flow distribution of a refrigerant flow path in the heat exchange assembly can be adjusted by adjusting the opening degree of at least part of valves, so that the heat exchange assembly is suitable for different working conditions, and different performance requirements are met. 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, 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.

In order 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 includes a first main pipeline, a first tube group, a second tube group, and a second main pipeline, which are sequentially connected in series, the first tube group and the second tube group respectively include at least one heat exchange tube, the heat exchange assembly further includes a first bypass pipeline and a second bypass pipeline, the first bypass pipeline is provided with a first valve, the second bypass pipeline is provided with a second valve, the second main pipeline is provided with a third valve, one end of the first bypass pipeline is connected to the first main pipeline, and the other end of the first bypass pipeline is connected between the third valve and the second tube group on the second main pipeline; one end of the second bypass pipeline is connected to one side, far away from the second pipe group, of the third valve on the second main pipeline, the other end of the second bypass pipeline is connected between the first pipe group and the second pipe group, one of the first valve and the second valve is a two-way throttle valve, and the other valve is a one-way valve or an electric stop valve.

In the heat exchange assembly of the embodiment of the application, the refrigerant may flow from a first main pipeline of the heat exchange assembly to a second main pipeline (for short, in a first flow manner), or may flow from the second main pipeline of the heat exchange assembly to the first main pipeline (for short, in a second flow manner). Because one of the first valve and the second valve is a two-way throttle valve and the other is a one-way valve or an electric stop valve, the distribution structures of the refrigerant flow paths in the first flow mode and the second flow mode are different, the refrigerant flow paths in the first pipe group and the second pipe group are possibly connected in parallel in one flow mode, and the refrigerant flow paths in the other flow mode are connected in series. For example, if the first valve is a one-way valve and blocks the refrigerant from flowing from the first main line to the second main line, in the first flow mode, the second valve (two-way throttle valve) is controlled to close or keep a small opening degree, and the third valve is opened, so that at least a part of the refrigerant flows through the first main line, the first tube group, the second tube group, and the second main line in sequence, that is, the flow paths in the first tube group and the second tube group are connected in series; in the second flow mode, the second valve is kept at a certain opening degree, the third valve is closed, and then the refrigerant flows through the second main pipeline and flows to the first main pipeline through the first pipe group and the second pipe group respectively, namely, the flow paths in the first pipe group and the second pipe group are connected in parallel. In both the first flow mode and the second flow mode, the flow rate can be adjusted by adjusting the opening degree of the two-way throttle valve. The flow state of the refrigerant in the heat exchange assembly is flexible and controllable, so that the use requirements of the heat exchange assembly under different scenes can be met.

In an alternative embodiment, the third valve is a one-way valve, and in the case where one of the first valve and the second valve is a one-way valve, one of the two one-way valves is in a flow state and the other is in a flow-cut state when the refrigerant flows through the heat exchange assembly. After the third valve is set as the one-way valve, the refrigerant can be cut off in a one-way mode, namely the refrigerant is opened in the first flow mode and closed in the second flow mode, and the control is simplified. In order to avoid short-circuit flow (a large amount of refrigerant does not flow through the heat exchange tube), the two check valves cannot be in a circulation state at the same time.

In an alternative embodiment, the first valve and the third valve are both one-way valves, the first valve allows the refrigerant to flow to the first main line, and the third valve allows the refrigerant in the second main line to flow away from the second tube set.

In an alternative embodiment, the second tube bank comprises one heat exchange tube and the first tube bank comprises two heat exchange tubes arranged in parallel. In this embodiment, when the refrigerant flows with first flow mode, can be earlier through two heat exchange tubes of parallelly connected, pass through a heat exchange tube of second nest of tubes (the second bypass pipeline can have the refrigerant circulation also can not have simultaneously), when heat exchange assembly used as the condenser, first nest of tubes and second nest of tubes are established ties, and high temperature gaseous refrigerant is earlier through two heat exchange tubes of the parallelly connected of first nest of tubes, carries out high-efficient heat transfer, then gets into the second nest of tubes, and the second nest of tubes can regard as the subcooling section.

In an alternative embodiment, the third valve is an electrically operated shut-off valve. In this embodiment, the third valve uses an electric shut-off valve, which is more efficient in blocking fluid than a check valve and can be opened or closed in a controlled manner, providing greater flexibility.

In an alternative embodiment, the heat exchange assembly further comprises a multi-way valve, and the first tube bank, the second tube bank and the second bypass line are connected through the multi-way valve.

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

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 one embodiment of the present application;

fig. 5 is a schematic view of a heat exchange assembly as a condenser in another 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-a first main line; 520-a first tube set; 521-a first heat exchange tube; 530-a second tube set; 531-a second heat exchange tube; 540 — a second main line; 541-a third valve; 550-a first bypass line; 551-a first valve; 560-a second bypass line; 561-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 improve the problem in the prior art, this application embodiment provides a heat exchange assembly, through set up three valves rationally in the pipeline, can adjust the flow path form (including the structure and the flow distribution of flow path) among the heat exchange assembly through the aperture of adjusting at least partial valve to adapt to different operating modes, satisfy different performance demands. 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 indoor heat exchanger 400 and the outdoor heat exchanger 100 are both provided with the heat exchange assembly 500, and the refrigerant is subjected to phase change in the heat exchange assembly 500, so that heat exchange with the environment is performed. To realize the switching between the cooling and heating modes, the air conditioning system 010 further includes a direction switching valve 300, and the direction switching valve 300 switches the state such that the discharge end of the compressor 200 can selectively deliver 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 an air conditioning function, which is not 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 is evaporated 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.

FIG. 3 is a schematic view of 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 heat exchange assembly 500 of the present application includes a first main line 510, a first tube bank 520, a second tube bank 530 and a second main line 540 sequentially arranged in series, the first tube bank 520 and the second tube bank 530 respectively include at least one heat exchange tube, the heat exchange assembly 500 further includes a first bypass line 550 and a second bypass line 560, a first valve 551 is arranged on the first bypass line 550, a second valve 561 is arranged on the second bypass line 560, a third valve 541 is arranged on the second main line 540, one end of the first bypass line 550 is connected to the first main line 510, and the other end is connected between the third valve 541 and the second tube bank 530 on the second main line 540; one end of the second bypass line 560 is connected to the second main line 540 at a side of the third valve 541 away from the second tube set 530, and the other end is connected between the first tube set 520 and the second tube set 530, one of the first valve 551 and the second valve 561 is a two-way throttle valve, and the other is a one-way valve or an electric stop valve.

In the present embodiment in particular, the first tube group 520 includes two first heat exchange tubes 521, and the second tube group 530 includes one second heat exchange tube 531. In this embodiment, the first valve 551 is a one-way valve, and the second valve 561 is a two-way throttle valve. The third valve 541 is a check valve or an electric shutoff valve, and in this embodiment, is specifically a check valve. In the present embodiment, the first valve 551 allows the refrigerant to flow to the first main line 510 (the other direction is blocked), and the third valve 541 allows the refrigerant in the second main line 540 to flow away from the second tube set 530 (the other direction is blocked).

When the heat exchange assembly 500 of the embodiment of the application is in use, a refrigerant may flow from the first main pipeline 510 to the second main pipeline 540 of the heat exchange assembly 500 (for short, in a first flow manner), or may flow from the second main pipeline 540 to the first main pipeline 510 of the heat exchange assembly 500 (for short, in a second flow manner). Since one of the first valve 551 and the second valve 561 (specifically, the second valve 561 in the present embodiment) is a two-way throttle valve, and the other one (specifically, the first valve 551 in the present embodiment) is a one-way valve or an electric stop valve, the distribution structures of the refrigerant flow paths in the first flow manner and the second flow manner are different. For example, in the present embodiment, in the first flow mode, when the second valve 561 (two-way throttle valve) is controlled to close or keep a small opening degree, at least a portion of the refrigerant flows through the first main line 510, the first tube group 520, the second tube group 530, and the second main line 540 in sequence, that is, the flow paths in the first tube group 520 and the second tube group 530 are connected in series; in the second flow mode, the second valve 561 is kept at a certain opening degree, so that the refrigerant flows through the second main line 540, and then flows to the first main line 510 through the first and

second tube groups

520 and 530, that is, the flow paths in the first and

second tube groups

520 and 530 are connected in parallel. In addition, no matter in the first flow mode or the second flow mode, the opening degree of the two-way throttle valve can be adjusted to adjust the flow rate, and the problems of heat exchange, frosting and the like can be improved through the adjustment. Because the flowing state of the refrigerant in the heat exchange assembly 500 is flexible and controllable, the use requirements of the heat exchange assembly 500 under different scenes can be met.

In the present embodiment, in the case that one of the first valve 551 and the second valve 561 is a check valve, and the third valve 541 is a check valve, when the refrigerant flows through the heat exchange assembly 500, one of the two check valves is in a flow state, and the other one is in a flow-stopping state. This is to avoid short-circuit flow, i.e. a large amount of refrigerant flows from the first main line 510 to the second main line 540 (or vice versa) directly through the two check valves without flowing through the heat exchange tubes for heat exchange. Therefore, both check valves cannot be in the flow state at the same time.

In this embodiment, the third valve 541 is a one-way valve, so that the refrigerant can be blocked in one way, which is equivalent to opening in the first flow mode and closing in the second flow mode, thereby simplifying the control. In other alternative embodiments, the third valve 541 may also be an electric shutoff valve, which can be controlled to perform the same function as a check valve, so that the check valve can more effectively block the flow (preventing the check valve from failing to effectively block the flow due to the refrigerant pressure being too high), and the third valve can be controlled to open or close, which is more flexible. Similarly, the first valve 551 may also be an electric shutoff valve. In other embodiments, when the first valve 551 and the third valve 541 are both check valves, the flow-allowing directions of the two check valves may be opposite to that of the present embodiment.

In this embodiment, when the refrigerant flows in the first flow manner, the refrigerant first passes through the two first heat exchange tubes 521 connected in parallel, and then passes through the second heat exchange tube 531 of the second tube group 530 (meanwhile, the second bypass line 560 may or may not have a refrigerant flowing), when the heat exchange assembly 500 is used as a condenser, the first tube group 520 and the second tube group 530 are connected in series, the high-temperature gaseous refrigerant first passes through the two first heat exchange tubes 521 connected in parallel, performs high-efficiency heat exchange, and then enters the second tube group 530, and the second tube group 530 can be used as a supercooling section. Fig. 5 is a schematic view of another embodiment of the present application showing a heat exchange assembly 500 as a condenser. In an alternative embodiment, as shown in FIG. 5, the first tube bank 520 can have only one first heat exchange tube 521 and the second tube bank 530 can have two second heat exchange tubes 531. In this case, unlike the embodiment of fig. 3, when the first tube group 520 and the second tube group 530 are connected in series, the refrigerant passes through the first heat exchange tube 521 and then passes through the second heat exchange tubes 531.

In an alternative embodiment, heat exchange assembly 500 further comprises a multi-way valve 570, and first tube bank 520, second tube bank 530, and second bypass line 560 are connected by multi-way valve 570. In this embodiment, the multi-way valve 570 is a four-way valve, and the two first heat exchange tubes 521 of the first tube group 520, the second heat exchange tube 531 of the second tube group 530, and the second bypass line 560 are all connected to the four-way valve.

In an alternative embodiment, the heat exchange tubes in the first tube bank 520 and the second tube bank 530 are each 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 tubes in the first tube group 520 and the second tube group 530 are in the same plane. Each heat exchange tube is arranged on the same plane, so that the blower can be conveniently swept, and the heat exchange efficiency is prevented from being deteriorated due to overlapping.

In the outdoor heat exchanger 100 of the air conditioning system 010 provided in the embodiment of the present application, including the heat exchange assembly 500, a first main line 510 of the heat exchange assembly 500 may be communicated with the compressor 200 (through the reversing valve 300), and a second main line 540 may be connected with the throttling assembly 600. When the air conditioning system 010 is in the cooling mode and the heat exchange module 500 serves as a condenser, the first main line 510 is connected to the discharge side of the compressor 200, the gaseous refrigerant enters from the first main line 510 in the first flow direction, and the liquid refrigerant exits from the second main line 540, and the refrigerant flow paths in the first and

second tube banks

520 and 530 may be connected in series by closing (or closing) the second valve 561 (two-way throttle valve) and opening the third valve 541. Of course, the opening degree of the second valve 561 may also be adjusted in this process, so as to adjust the flow rate and distribution passing through each heat exchange tube. When the air conditioning system 010 is in a heating mode, the heat exchange assembly 500 serves as an evaporator, the first main line 510 is connected to a suction side of the compressor 200, a low-pressure liquid refrigerant enters from the second main line 540 according to a second flow mode, the third valve 541 is closed, the first valve 551 is kept open, the second valve 561 has a certain opening degree (can be adjusted), the low-pressure gaseous refrigerant is sent out from the first main line 510, and flow paths in the first tube bank 520 and the second tube bank 530 are connected in parallel. Therefore, no matter the outdoor unit of the air conditioning system 010 is in the cooling mode or the heating mode, the refrigerant flow path in the heat exchange assembly 500 can be adjusted to a reasonable form all the time as required, and thus the performance is better.

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, and the heat exchange assembly 500 is also adopted in the indoor heat exchanger 400.

To sum up, heat exchange assembly 500 that this application embodiment provided uses check valve (or stop valve) and two-way choke valve jointly, when realizing the different flow paths of refrigeration, heating, still can improve refrigerant flow, velocity of flow and the problem of frosting through the flow of two-way choke valve control refrigerant.

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 the circulation of a refrigerant in an air conditioning system (010), the heat exchange assembly (500) comprises a first main pipeline (510), a first tube bank (520), a second tube bank (530) and a second main pipeline (540) which are sequentially arranged in series, the first tube group (520) and the second tube group (530) each comprising at least one heat exchange tube, the heat exchange assembly (500) further comprises a first bypass line (550) and a second bypass line (560), a first valve (551) is arranged on the first bypass line (550), a second valve (561) is arranged on the second bypass line (560), a third valve (541) is arranged on the second main pipeline (540), one end of the first bypass pipeline (550) is connected to the first main pipeline (510), and the other end of the first bypass pipeline is connected between the third valve (541) and the second pipe group (530) on the second main pipeline (540); one end of the second bypass pipeline (560) is connected to the second main pipeline (540) at a side of the third valve (541) far away from the second pipe group (530), the other end is connected between the first pipe group (520) and the second pipe group (530), one of the first valve (551) and the second valve (561) is a bidirectional throttle valve, and the other is a one-way valve or an electric stop valve.

2. The heat exchange assembly of claim 1, wherein the third valve (541) is a one-way valve, and wherein, in case one of the first valve (551) and the second valve (561) is a one-way valve, when a refrigerant flows through the heat exchange assembly (500), one of the two one-way valves is in a flow-through state and the other is in a shut-off state.

3. A heat exchange assembly according to claim 2, wherein the first valve (551) and the third valve (541) are each a one-way valve, the first valve (551) allowing the refrigerant to flow to the first main line (510), and the third valve (541) allowing the refrigerant in the second main line (540) to flow in a direction away from the second tube bank (530).

4. A heat exchange assembly according to claim 3, wherein the second tube bank (530) comprises one heat exchange tube and the first tube bank (520) comprises two heat exchange tubes arranged in parallel.

5. A heat exchange assembly according to claim 1, wherein the third valve (541) is an electrically operated shut-off valve.

6. The heat exchange assembly of claim 1, wherein the heat exchange assembly (500) further comprises a multi-way valve (570), the first tube bank (520), the second tube bank (530), and the second bypass line (560) being connected by the multi-way valve (570).

7. A heat exchange assembly according to claim 1, wherein the heat exchange tubes in the first tube bank (520) and the second tube bank (530) are each serpentine tubes.

8. A heat exchange assembly according to claim 7, wherein the heat exchange tubes of the first tube bank (520) and the second tube bank (530) are in the same plane.

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.