CN216769620U

CN216769620U - Heat exchange assembly, outdoor unit and air conditioning system

Info

Publication number: CN216769620U
Application number: CN202220404846.1U
Authority: CN
Inventors: 郭晓颖
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 application provides a heat exchange assembly, an outdoor unit and an air conditioning system, and relates to the field of air conditioners. The heat exchange assembly of this application can cut off or adjust the flow to the relevant position of second branch line and second main line through set up first bidirectional throttle valve and second bidirectional throttle valve on second branch line and second main line respectively, and the last valve of bypass line can cut off or let pass the refrigerant in the bypass line. Therefore, the heat exchange assembly provided by the application can control the flowing state of the refrigerant in the heat exchange assembly more flexibly. 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. The application provides an off-premises station and air conditioning system includes foretell heat exchange assemblies.

Description

Heat exchange assembly, outdoor unit and air conditioning system

Technical Field

The application 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 problem that this application was solved is how to improve heat exchange assemblies's use flexibility to satisfy the performance demand under the different situation.

In order to solve the above problems, in a first aspect, the present application provides a heat exchange assembly for circulating a refrigerant of an air conditioning system, the heat exchange assembly includes a first main pipeline sequentially connected in series, the heat exchange tube group and the second are responsible for the pipeline, the heat exchange tube group is including parallelly connected first branch line and the second branch line that sets up, be provided with first heat exchange tube in the first branch line, be provided with the second heat exchange tube in the second branch line, be provided with first bidirectional throttle valve on the second branch line, first bidirectional throttle valve is located the one side that the second heat exchange tube is close to first main pipeline, the second is responsible for the online second bidirectional throttle valve that is provided with, heat exchange assembly still includes the bypass pipeline, the one end of bypass pipeline is connected in the second between second bidirectional throttle valve and heat exchange tube group and is responsible for the online, the other end is connected in the second branch between second heat exchange tube and the first bidirectional throttle valve, be provided with the valve on the bypass pipeline.

In the embodiment of the present application, by providing the first bidirectional throttling valve and the second bidirectional throttling valve on the second branch line and the second main line respectively, the relative positions of the second branch line and the second main line can be cut off or the flow can be adjusted, and the valve on the bypass line can cut off or release the refrigerant in the bypass line. Therefore, the heat exchange assembly provided by the embodiment of the application can more flexibly control the flow state of the refrigerant in the heat exchange assembly, for example, by adjusting the opening degree of the first bidirectional throttle valve and the second bidirectional throttle valve, the distribution condition of the refrigerant in each branch line can be adjusted, the first bidirectional throttle valve and the second bidirectional throttle valve are completely closed, and the valve is opened, so that the refrigerant can sequentially flow through the first branch line and the second branch line (or vice versa). 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 valve is an electrically operated shut-off valve. The electric stop valve has the characteristics that the opening or closing can be flexibly controlled, so that the refrigerant can be cut off or released according to requirements in actual application.

In an alternative embodiment, the valve is a one-way valve. The one-way valve has the characteristics that the refrigerant can be cut off unidirectionally without being controlled, the control complexity is reduced, and the system stability is facilitated.

In an optional embodiment, the check valve allows the refrigerant in the second branch line to be delivered to the second main line, and prevents the refrigerant in the second main line from being delivered to the second branch line. The arrangement mode means that when the refrigerant integrally flows from the first main pipeline to the second main pipeline, the second bidirectional throttling valve on the second main pipeline can be completely closed, so that the flow paths in the first heat exchange pipe and the second heat exchange pipe can be in a serial state (although the first branch line and the second branch line are structurally connected in parallel, at least part of the refrigerant passes through the first heat exchange pipe and the second heat exchange pipe successively due to the control relationship of the bidirectional throttling valve and the valve). In some cases, compared with a parallel structure, the first heat exchange tube and the second heat exchange tube are required to be connected in series to meet the use requirement. If the refrigerant flows from the second main pipeline to the first main pipeline as a whole, the second one-way throttle valve is required to keep a certain opening degree, at the moment, if the first two-way throttle valve is opened, the flow paths of the first branch line and the second branch line are in a parallel connection state, and if the first two-way throttle valve is completely closed, the refrigerant only passes through the first branch line.

In an alternative embodiment, the heat exchange assembly further comprises a multi-way valve, and the heat exchange tube set is connected with the second main pipeline through the multi-way valve.

In an optional embodiment, the heat exchange tube set further includes a third branch line, a third heat exchange tube is arranged on the third branch line, and the third branch line is arranged in parallel with the first branch line and the second branch line. The flow paths in the first heat exchange tube, the second heat exchange tube and the third heat exchange tube can be selectively connected in parallel by reasonably adjusting the first bidirectional throttling valve and the second bidirectional throttling valve, or the flow paths of the first heat exchange tube and the third heat exchange tube are connected in parallel and then connected in series with the flow path in the second heat exchange tube. Furthermore, the flow distribution of the refrigerant is adjustable.

In an alternative embodiment, the first heat exchange tube, the second heat exchange tube and the third heat exchange tube 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.

In an alternative embodiment, the first heat exchange tube, the second heat exchange tube and the third heat exchange tube are in the same plane. The first heat exchange tube, the second heat exchange tube and the third heat exchange tube are 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 application provides an outdoor unit comprising the heat exchange assembly of any one of the preceding embodiments.

In a third aspect, the present application provides an air conditioning system comprising the heat exchange assembly of any 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-an air conditioning system; 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 leg; 521-a first heat exchange tube; 530-second leg; 531-a second heat exchange tube; 532-first two-way throttle valve; 540-third leg; 541-a third heat exchange tube; 550-bypass line; 551-a valve; 560-a second main line; 561-second two-way throttle 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 among the above-mentioned prior art, this application embodiment provides a heat exchange assembly, through setting up two-way choke valves, can adjust the flow path form (including the structure and the flow distribution of flow path) among the heat exchange assembly through the degree of opening of adjusting two-way choke 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 application more comprehensible, embodiments accompanying the present application 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. 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 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 throttle unit 600, 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 pipeline 510, a heat exchange tube group, and a second main pipeline 560, which are sequentially arranged in series, the heat exchange tube group includes a first branch line 520, a second branch line 530, and a third branch line 540, which are arranged in parallel, the first branch line 520 is provided with a first heat exchange tube 521, the second branch line 530 is provided with a second heat exchange tube 531, and the third branch line 540 is provided with a third heat exchange tube 541. The second branch 530 is provided with a first bidirectional throttle 532, the first bidirectional throttle 532 is located at one side of the second heat exchange tube 531 close to the first main tube 510, the second main tube 560 is provided with a second bidirectional throttle 561, the heat exchange assembly 500 further comprises a bypass tube 550, one end of the bypass tube 550 is connected to the second main tube 560 between the second bidirectional throttle 561 and the heat exchange tube set, the other end of the bypass tube 550 is connected to the second branch 530 between the second heat exchange tube 531 and the first bidirectional throttle 532, and the bypass tube 550 is provided with a valve 551. It should be understood that "serial connection" or "parallel connection" between the branch lines and the main line refers to serial connection or parallel connection of the related lines, and the distribution of the internal refrigerant flow paths may be inconsistent with the distribution of the line structures according to the control of the two-way throttle valve and the valve 551, for example, the first branch line 520 is parallel connected with the second branch line 530, but the internal refrigerant flow paths may be serial connected.

In alternative embodiments, the third branch line 540 may be omitted, leaving only the first branch line 520 and the second branch line 530; more legs (with heat exchange tubes disposed therein) may also be added in parallel with the first leg 520, the second leg 530, and the third leg 540.

In this embodiment, the valve 551 is an electric shutoff valve. The electric shutoff valve is characterized in that the opening or closing of the electric shutoff valve can be flexibly controlled, so that the refrigerant in the bypass line 550 can be cut off or released as required in the actual application of the heat exchange assembly 500 of the embodiment.

Under the condition that the refrigerant flows from the first main pipeline 510 to the second main pipeline 560 through the heat exchange tube sets, if the valve 551 is opened and the first bidirectional throttle 532 and the second bidirectional throttle 561 are closed (or the opening degree is adjusted to be minimum), the refrigerant (or most of the refrigerant) passes through the first branch line 520 and the third branch line 540, then passes through a section of the second branch line 530 in which the second heat exchange tube 531 is arranged, then flows to the second main pipeline 560 through the bypass pipeline 550, and finally is sent out from the heat exchange assembly 500. In this case, the refrigerant flow paths in the first branch line 520 and the third branch line 540 are connected in parallel and then connected in series with the refrigerant flow path in the second branch line 530, so that the refrigerant flow path is longer as a whole (because the flow paths in the second heat exchange tubes 531 are connected in series), and the heat exchange assembly 500 is suitable for being used as a condenser on the high pressure side. Alternatively, if the refrigerant flows from the second main line 560 to the first main line 510 through the heat exchange tube sets, the valve 551 may be closed, and the first and second two-way throttles 532 and 561 may be opened, so that the flow rates of the first, second and

third branch lines

520, 530 and 540 may be parallel. In this case, the refrigerant flow path is short, and the heat exchange assembly 500 is suitable for use as an evaporator on the low pressure side.

In alternative embodiments, valve 551 may be a one-way valve. The one-way valve has the characteristics that the refrigerant can be cut off unidirectionally without being controlled, the control complexity is reduced, and the system stability is facilitated.

In an alternative embodiment, the check valve allows the refrigerant in the second branch line 530 to be delivered to the second main line 560, and prevents the refrigerant in the second main line 560 from being delivered to the second branch line 530. This arrangement means that when the refrigerant flows from the first main pipeline 510 to the second main pipeline 560 as a whole, the second two-way throttle 561 on the second main pipeline 560 can be completely closed, so that the flow paths in the first heat exchange tube 521 and the second heat exchange tube 531 can be in a serial state (although the first branch line 520 and the second branch line 530 are structurally parallel, at least a portion of the refrigerant passes through the first heat exchange tube 521 and the second heat exchange tube 531 successively due to the control relationship of the two-way throttle and the valve 551), which is similar to the effect of the embodiment described above in which the valve 551 is an electric shutoff valve.

It should be understood that the one-way valve could be reversed. Similarly, when the valve 551 is an electric shutoff valve, it can be controlled in the reverse manner to the previous embodiment: for example, when the refrigerant flows from the first main line 510 to the second main line 560 through the heat exchange tube group, the valve 551 is closed, the first bidirectional throttle valve 532 and the second bidirectional throttle valve 561 maintain a certain opening degree (or are fully opened), and the flow paths of the three branch lines are connected in parallel; under the condition that the refrigerant flows from the second main pipeline 560 to the first main pipeline 510 through the heat exchange tube group, the valve 551 is opened, and the refrigerant (or part of the refrigerant) firstly passes through the second heat exchange tube 531 and then passes through the first heat exchange tube 521 and the third heat exchange tube 541 which are connected in parallel.

In this embodiment, the heat exchange assembly 500 further comprises a multi-way valve 570, and the heat exchange tube set and the second main line 560 are connected through the multi-way valve 570.

Optionally, the first heat exchange tube 521, the second heat exchange tube 531 and the third heat exchange tube 541 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 first heat exchange pipe 521, the second heat exchange pipe 531 and the third heat exchange pipe 541 are located on the same plane. The first heat exchange tube 521, the second heat exchange tube 531 and the third heat exchange tube 541 are 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, the first main line 510 of the heat exchange assembly 500 may be communicated with the compressor 200 (via the reversing valve 300), and the second main line 560 is connected to 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 main line 510 is connected to the exhaust side of the compressor 200, a gaseous refrigerant enters from the first main line 510, and a liquid refrigerant flows out from the second main line 560, and the first two-way throttle 532 and the second two-way throttle 561 are closed (or reduced) and the valve 551 is opened, so that the flow paths in the first heat exchange tube 521 and the third heat exchange tube 541 are connected in parallel first and then connected in series with the flow path in the second heat exchange tube 531 (the second heat exchange tube 531 is located downstream of the first heat exchange tube 521 and the third heat exchange tube 541 and can be regarded as a supercooling section). Of course, the opening degree of the first and second two-

way throttle valves

532 and 561 may be adjusted to adjust the flow rate and distribution passing through each heat exchange pipe. 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 the suction side of the compressor 200, a low-pressure liquid refrigerant enters from the second main line 560, the valve 551 is closed, the first bidirectional throttle valve 532 and the second bidirectional throttle valve 561 are kept to have a certain opening degree (adjustable), a low-pressure gaseous refrigerant is sent out from the first main line 510, and flow paths in the branch lines 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.

In summary, in the embodiment of the present invention, by providing the first bidirectional throttle 532 and the second bidirectional throttle 561 on the second branch line 530 and the second main line 560, respectively, the relative positions of the second branch line 530 and the second main line 560 can be cut off or the flow rate can be adjusted, and the valve 551 on the bypass line 550 can cut off or release the refrigerant in the bypass line 550. Therefore, the heat exchange module 500 according to the embodiment of the present invention can more flexibly control the flow state of the refrigerant in the heat exchange module 500, for example, by adjusting the opening degrees of the first bidirectional throttle 532 and the second bidirectional throttle 561, the distribution of the refrigerant in each branch line can be adjusted, and by completely closing the first bidirectional throttle 532 and the second bidirectional throttle 561 and opening the valve 551, the refrigerant can sequentially flow through the first branch line 520 and the second branch line 530 (or vice versa). 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 in different scenes can be met.

Although the present application is disclosed above, the present application is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present disclosure, and it is intended that the scope of the present disclosure be defined by the appended claims.

Claims

1. The heat exchange assembly is used for refrigerant circulation of an air conditioning system and is characterized in that the heat exchange assembly (500) comprises a first main pipeline (510), a heat exchange pipe set and a second main pipeline (560) which are sequentially arranged in series, the heat exchange pipe set comprises a first branch line (520) and a second branch line (530) which are arranged in parallel, a first heat exchange pipe (521) is arranged in the first branch line (520), a second heat exchange pipe (531) is arranged in the second branch line (530), a first bidirectional throttle valve (532) is arranged on the second branch line (530), the first bidirectional throttle valve (532) is located on one side, close to the first main pipeline (510), of the second heat exchange pipe (531), a second bidirectional throttle valve (561) is arranged on the second main pipeline (560), the heat exchange assembly (500) further comprises a bypass pipeline (550), and one end of the bypass pipeline (550) is connected to the second bidirectional throttle valve (561) and the refrigerant circulation between the heat exchange pipe set and the second bidirectional throttle valve (561) The other end of the second main pipeline (560) is connected to the second branch line (530) between the second heat exchange pipe (531) and the first bidirectional throttle valve (532), and a valve (551) is arranged on the bypass pipeline (550).

2. The heat exchange assembly of claim 1, wherein the valve (551) is an electrically operated shutoff valve.

3. The heat exchange assembly of claim 1, wherein the valve (551) is a one-way valve.

4. A heat exchange assembly according to claim 3, wherein the one-way valve allows refrigerant in the second branch line (530) to be transported to the second main line (560) and prevents refrigerant in the second main line (560) from being transported to the second branch line (530).

5. A heat exchange assembly according to claim 1, characterized in that the heat exchange assembly (500) further comprises a multi-way valve (570), the heat exchange bank being connected with the second main line (560) through the multi-way valve (570).

6. A heat exchange assembly according to claim 1, wherein the heat exchange tube set further comprises a third branch (540), a third heat exchange tube (541) is arranged on the third branch (540), and the third branch (540) is arranged in parallel with the first branch (520) and the second branch (530).

7. A heat exchange assembly according to claim 6, wherein the first (521), second (531) and third (541) heat exchange tubes are each serpentine tubes.

8. A heat exchange assembly according to claim 6, wherein the first heat exchange tube (521), the second heat exchange tube (531) and the third heat exchange tube (541) 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.