Air conditioning system and control method thereof

Abstract

The invention relates to an air-conditioning system, particularly provides an air-conditioning system and a control method of the air-conditioning system, and aims to solve the problem that the existing air-conditioning system cannot reduce the boiling noise of a pipeline while ensuring the refrigerating and heating performance of an air conditioner. In order to achieve the purpose, the air conditioning system comprises a compressor, an outdoor heat exchanger, a throttling element, an indoor heat exchanger, a reversing valve, a gas-liquid separator, a first bypass pipe, a first valve body and a second valve body which are sequentially communicated and form a closed loop, and the gas-liquid separator is communicated between the outdoor heat exchanger and the throttling element; the two ends of the first bypass pipe communicate with refrigerant pipelines on the two sides of the gas-liquid separator. The first valve body is arranged on the first bypass pipe and arranged to be capable of blocking refrigerant flowing out of the outdoor heat exchanger and conducting refrigerant flowing out of the throttling element. And the second valve body is arranged on the refrigerant pipeline between the liquid outlet and one end of the first bypass pipe, and is arranged to be capable of blocking the refrigerant flowing out of the throttling element and conducting the refrigerant flowing out of the liquid outlet.

Description

Technical Field

[0001] The present invention relates to the field of air conditioners, and specifically provides an air conditioning system and a control method for the air conditioning system. Background Art

[0002] During the operation of an air conditioner, the noise problem has always been a key factor affecting the user experience. For example, in the cooling mode, when the refrigerant before the throttling element upstream of the indoor heat exchanger undergoes a phase change, especially when the degree of undercooling is insufficient, it will present a two-phase state of a gas-liquid mixture. In this state, the flow characteristics of the refrigerant change, and the movement of the gas and liquid in the pipeline will generate a sound similar to boiling, thereby causing noise.

[0003] To solve the noise problem caused by the two-phase refrigerant state, although the current solutions can solve the indoor noise problem, they often come at the cost of sacrificing the cooling and heating efficiency, resulting in a decline in the overall performance of the air conditioner. For example, some existing technical solutions propose to set the throttling element as an electronic expansion valve. In the cooling mode, the electronic expansion valve is controlled to open to the maximum valve opening to ensure that the refrigerant entering the outdoor heat exchanger is completely evaporated, avoiding the two-phase state of the gas-liquid mixture. However, this will lead to a decline in the cooling efficiency. Some solutions involve modifying the structure of the air conditioning system, but after modifying the structure of the air conditioning system, it may also affect the heating performance of the air conditioning system.

[0004] Correspondingly, there is a need in the art for a new air conditioning system and a control method for the air conditioning system to solve the problem that the existing air conditioning system cannot reduce the pipeline boiling noise while ensuring the cooling and heating performance of the air conditioner. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problem that the existing air conditioning system cannot reduce the pipeline boiling noise while ensuring the cooling and heating performance of the air conditioner.

[0006] In a first aspect, the present invention provides an air conditioning system, characterized by comprising: a compressor, an outdoor heat exchanger, a throttling element, and an indoor heat exchanger that are connected in sequence to form a closed loop; a reversing valve, through which the compressor is connected to the outdoor heat exchanger and the indoor heat exchanger, and the reversing valve is used to switch the flow direction of the refrigerant discharged from the compressor so that the refrigerant can selectively flow to the outdoor heat exchanger or the indoor heat exchanger; a gas-liquid separator connected between the outdoor heat exchanger and the throttling element, including a gas-liquid inlet and a liquid outlet, the gas-liquid inlet is connected to the liquid port of the outdoor heat exchanger, and the liquid outlet is connected to the throttling element; a first bypass pipe, both ends of which are connected to the refrigerant pipelines on both sides of the gas-liquid separator; a first valve body provided on the first bypass pipe, configured to be able to block the refrigerant flowing out of the outdoor heat exchanger and to be able to conduct the refrigerant flowing out of the throttling element; a second valve body provided on the refrigerant pipeline between the liquid outlet and one end of the first bypass pipe, configured to be able to block the refrigerant flowing out of the throttling element and to be able to conduct the refrigerant flowing out of the liquid outlet.

[0007] In the case where the refrigerant discharged from the compressor directly flows to the outdoor heat exchanger, due to the blockage of the first bypass pipe by the first valve body, the refrigerant in a gas-liquid two-phase state after heat exchange in the outdoor heat exchanger will enter the gas-liquid separator for gas-liquid separation. The liquid refrigerant flows out from the liquid outlet of the gas-liquid separator, so that the refrigerant entering the throttling element is in a liquid state, reducing the boiling noise. And since there is no need to adjust the opening degree of the throttling element, the original refrigeration performance of the air conditioning system will not be affected. In the case where the refrigerant discharged from the compressor directly flows to the indoor heat exchanger, due to the blockage of the second valve body, the refrigerant throttled by the throttling element will not flow into the gas-liquid separator, but will enter the outdoor heat exchanger through the first bypass pipe to participate in heat exchange, thus avoiding liquid accumulation in the gas-liquid separator and ensuring the heating performance of the system. In short, the above method enables the air conditioning system to ensure the system performance in both the refrigeration and heating modes and can also reduce noise.

[0008] In an alternative technical solution of the above air conditioning system, the gas-liquid separator further includes a gas outlet for discharging the gas in the gas-liquid separator.

[0009] After the separated gas in the gas-liquid separator is discharged, the gas-liquid separation efficiency can be improved, ensuring that the refrigerant flowing into the throttling element is pure liquid refrigerant, thereby further reducing noise.

[0010] In an alternative technical solution of the above air conditioning system, the air conditioning system further includes a second bypass pipe, one end of which is connected to the gas outlet, and the other end is connected to the air pipe between the indoor heat exchanger and the compressor.

[0011] In the refrigeration mode, the gaseous refrigerant discharged from the gas-liquid separator generally has a relatively low temperature and pressure. Mixing these gases with the low-temperature and low-pressure gaseous refrigerant after heat exchange in the indoor heat exchanger can make the air-conditioning system more efficient during the circulation process. In addition, the refrigerant discharged from the gas-liquid separator continues to participate in the heat exchange process, which can avoid waste of resources.

[0012] In an alternative technical solution of the above air-conditioning system, the gas-liquid separator is disposed in the casing of the indoor unit, and the other end of the second bypass pipe communicates with the gas port side of the indoor heat exchanger.

[0013] Since both the indoor heat exchanger and the throttling element of the air conditioner are disposed in the casing of the indoor unit, therefore, in the present invention, the gas-liquid separator is also disposed in the casing of the indoor unit, and the other end of the second bypass pipe communicates with the refrigerant pipe on the gas port side of the indoor heat exchanger, so that the second bypass pipe can be connected in the indoor unit, which can significantly shorten the length of the second bypass pipe, make the flow of the refrigerant in the air-conditioning system more efficient, reduce unnecessary heat exchange losses, maintain relatively stable temperature and pressure, and thus improve the refrigeration efficiency of the air conditioner.

[0014] In an alternative technical solution of the above air-conditioning system, a one-way valve is provided on the second bypass pipe, and the one-way valve is arranged to conduct the gas flowing out from the gas outlet.

[0015] This setting method can avoid the gaseous refrigerant after heat exchange in the indoor heat exchanger from returning to the gas-liquid separator through the second bypass pipe in the refrigeration mode, thereby affecting the separation efficiency of the gas-liquid separator, and does not prevent the gas discharged from the gas-liquid separator from flowing through the second bypass pipe to the air pipe between the indoor heat exchanger and the compressor.

[0016] In an alternative technical solution of the above air-conditioning system, the gas-liquid separator further includes a partition plate, the partition plate is disposed in the casing of the gas-liquid separator and is located between the gas outlet and the liquid outlet, and a plurality of through holes are provided on the partition plate.

[0017] When the refrigerant enters the gas-liquid separator, the liquid refrigerant will naturally settle to the bottom of the gas-liquid separator under the action of gravity, while the gaseous refrigerant will flow upward. The setting of the partition plate makes it more difficult for the liquid refrigerant to be carried upward by the gaseous refrigerant, because the liquid refrigerant needs to pass through the through holes on the partition plate to reach the gaseous refrigerant area. Therefore, the above setting method can improve the efficiency of gas-liquid separation.

[0018] In an alternative technical solution of the above air-conditioning system, the air-conditioning system is a multi-connected air-conditioning system with a plurality of indoor units.

[0019] In a multi-connected air-conditioning system with multiple indoor units, the multiple indoor units need to share an outdoor unit and a refrigerant circulation system. Different indoor units may have different load requirements. They may operate simultaneously during certain periods, or only some of the indoor units may be enabled. Since the refrigerant is prone to be affected by load changes during the flow process, the temperature and pressure fluctuations of the refrigerant are relatively large. This will cause the refrigerant to be in a gas-liquid two-phase mixed state when it enters the throttling element of the indoor unit in the case of insufficient subcooling degree of the outdoor unit. Therefore, the present invention improves the multi-connected air-conditioning system, that is, a gas-liquid separator is provided in front of the throttling element of the indoor unit, and a first bypass pipe, a first valve body and a second valve body are provided in cooperation with the gas-liquid separator, which can ensure that the refrigerant remains in a liquid state when entering the throttling element, avoiding the noise and system efficiency decline caused by the gas-liquid mixed state.

[0020] In an alternative technical solution of the above air-conditioning system, the first valve body is a check valve or a solenoid valve.

[0021] In an alternative technical solution of the above air-conditioning system, the second valve body is a check valve or a solenoid valve.

[0022] On the other hand, the present invention also provides a control method for an air-conditioning system. The air-conditioning system includes: a compressor, an outdoor heat exchanger, a throttling element and an indoor heat exchanger that are connected in sequence to form a closed loop; a reversing valve, the compressor is connected to the outdoor heat exchanger and the indoor heat exchanger through the reversing valve, and the reversing valve is used to switch the flow direction of the refrigerant discharged by the compressor so that the refrigerant selectively flows to the outdoor heat exchanger or the indoor heat exchanger; a gas-liquid separator, which is connected between the outdoor heat exchanger and the throttling element, includes a gas-liquid inlet and a liquid outlet, the gas-liquid inlet is connected to the liquid port of the outdoor heat exchanger, and the liquid outlet is connected to the throttling element; a first bypass pipe, both ends of which are connected to the refrigerant pipelines on both sides of the gas-liquid separator; a solenoid valve, which is arranged on the first bypass pipe; a check valve, which is arranged on the refrigerant pipeline between the liquid outlet and one end of the first bypass pipe, and is configured to block the refrigerant flowing out of the throttling element and conduct the refrigerant flowing out of the liquid outlet; the control method includes: controlling the reversing valve to perform a first action so that the refrigerant discharged by the compressor flows to the outdoor heat exchanger, and controlling the solenoid valve to close; controlling the reversing valve to perform a second action so that the refrigerant discharged by the compressor flows to the indoor heat exchanger, and controlling the solenoid valve to open. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, in which:

[0024] Figure 1 is a schematic structural diagram of the air-conditioning system of the present invention;

[0025] Figure 2 It is a schematic structural view of the gas-liquid separator of the air-conditioning system of the present invention;

[0026] Figure 3 It is a schematic structural view of the partition plate of the gas-liquid separator of the present invention;

[0027] Figure 4 It is a flowchart of the control method of the air-conditioning system of the present invention.

[0028] Description of the reference numerals:

[0029] 10 - Compressor; 11 - Outdoor heat exchanger; 12 - Throttling element; 13 - Indoor heat exchanger; 20 - Reversing valve; 30 - Gas-liquid separator; 301 - Gas-liquid inlet; 302 - Liquid outlet; 303 - Gas outlet; 304 - Partition plate; 40 - First bypass pipe; 50 - First valve body; 60 - Second valve body; 70 - Second bypass pipe; 80 - Check valve. Specific embodiments

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0031] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] The present invention provides an air-conditioning system, as Figure 1 and Figure 2As shown in the figure, it includes a compressor 10, an outdoor heat exchanger 11, a throttling element 12, and an indoor heat exchanger 13 that are connected in sequence to form a closed loop. It also includes a reversing valve 20, a gas-liquid separator 30, a first bypass pipe 40, a first valve body 50, and a second valve body 60. The compressor 10 is connected to the outdoor heat exchanger 11 and the indoor heat exchanger 13 through the reversing valve 20. The reversing valve 20 is used to switch the flow direction of the refrigerant discharged by the compressor 10 so that the refrigerant can selectively flow to the outdoor heat exchanger 11 or the indoor heat exchanger 13. The gas-liquid separator 30 is connected between the outdoor heat exchanger 11 and the throttling element 12, and includes a gas-liquid inlet 301 and a liquid outlet 302. The gas-liquid inlet 301 is connected to the liquid port of the outdoor heat exchanger 11, and the liquid outlet 302 is connected to the throttling element 12. Both ends of the first bypass pipe 40 are connected to the refrigerant pipelines on both sides of the gas-liquid separator 30. The first valve body 50 is arranged on the first bypass pipe 40 and is configured to block the refrigerant flowing out of the outdoor heat exchanger 11 and conduct the refrigerant flowing out of the throttling element 12. The second valve body 60 is arranged on the refrigerant pipeline between the liquid outlet 302 and one end of the first bypass pipe 40 and is configured to block the refrigerant flowing out of the throttling element 12 and conduct the refrigerant flowing out of the liquid outlet 302.

[0033] The compressor 10 is connected to the outdoor heat exchanger 11 and the indoor heat exchanger 13 through the reversing valve 20. The reversing valve 20 is used to switch the flow direction of the refrigerant discharged by the compressor 10 so that the refrigerant can selectively flow to the outdoor heat exchanger 11 or the indoor heat exchanger 13. In other words, the inlet (c) of the reversing valve 20 is connected to the exhaust port of the compressor 10, the outlet (e) of the reversing valve 20 is connected to the suction port of the compressor 10, the first port (a) of the reversing valve 20 is connected to the gas port of the outdoor heat exchanger 11, and the second port (h) of the reversing valve 20 is connected to the gas port of the indoor heat exchanger 13. When the air-conditioning system operates in the cooling mode, the inlet (c) of the reversing valve 20 is controlled to be connected to the first port (a) and the outlet (e) is connected to the second port (h). Thus, after the refrigerant discharged by the compressor 10 passes through the inlet (c) and the first port (a) of the reversing valve 20, it flows sequentially to the outdoor heat exchanger 11, the gas-liquid separator 30, the throttling element 12, the indoor heat exchanger 13, and then returns to the suction port of the compressor 10 through the second port (h) and the outlet (e) of the reversing valve 20. When the air-conditioning system operates in the heating mode, the inlet (c) of the reversing valve 20 is controlled to be connected to the second port (h) and the outlet (e) is connected to the first port (a). Thus, after the refrigerant discharged by the compressor 10 passes through the inlet (c) and the second port (h) of the reversing valve 20, it flows sequentially to the indoor heat exchanger 13, the throttling element 12, the outdoor heat exchanger 11, and then returns to the suction port of the compressor 10 through the first port (a) and the outlet (e) of the reversing valve 20. The above throttling element 12 can be an electronic expansion valve, a capillary tube, etc.

[0034] When the refrigerant discharged from the compressor 10 directly flows to the outdoor heat exchanger 11, the first bypass pipe 40 is blocked by the first valve body 50, and the refrigerant in the gas-liquid two-phase state after heat exchange in the outdoor heat exchanger 11 will enter the gas-liquid separator 30 for gas-liquid separation. The liquid refrigerant flows out from the liquid outlet 302 of the gas-liquid separator 30, so that the refrigerant entering the throttling element 12 is in a liquid state, reducing the boiling noise. And since there is no need to adjust the opening degree of the throttling element 12, the original refrigeration performance of the air-conditioning system will not be affected. When the refrigerant discharged from the compressor 10 directly flows to the indoor heat exchanger 13, due to being blocked by the second valve body 60, the refrigerant after throttling by the throttling element 12 will not flow into the gas-liquid separator 30, but enters the outdoor heat exchanger 11 through the first bypass pipe 40 to participate in heat exchange, thus avoiding liquid storage in the gas-liquid separator 30 and ensuring the heating performance of the system. In short, the above method enables the air-conditioning system to ensure the system performance in both the refrigeration and heating modes and can also reduce noise.

[0035] As a possible implementation manner, the first valve body 50 is a solenoid valve, so as to block the refrigerant flowing out from the outdoor heat exchanger 11 by controlling the solenoid valve to close during refrigeration operation, avoiding the refrigerant flowing directly from the first bypass pipe 40 to the throttling element 12; during heating operation, by controlling the solenoid valve to open to conduct the refrigerant flowing out from the throttling element 12, so that the refrigerant flows from the first bypass pipe 40 to the outdoor heat exchanger 11. Of course, the first valve body 50 can also be set as a check valve.

[0036] As a possible implementation manner, the second valve body 60 is configured as a solenoid valve, so as to conduct the refrigerant flowing out from the liquid outlet 302 by controlling the solenoid valve to open during refrigeration operation, enabling the refrigerant to flow to the throttling element 12, and during heating operation, by controlling the solenoid valve to close to block the refrigerant flowing out from the throttling element 12, avoiding the refrigerant flowing into the gas-liquid separator 30. Of course, the second valve body 60 can also be set as a check valve.

[0037] As a possible implementation manner, the gas-liquid separator 30 further includes a gas outlet 303, and the gas outlet 303 is used to discharge the gas in the gas-liquid separator 30. After the separated gas in the gas-liquid separator 30 is discharged, the gas-liquid separation efficiency can be improved, ensuring that the refrigerant flowing into the throttling element 12 is pure liquid refrigerant, thereby further reducing noise. Alternatively, the gas outlet 303 of the present invention can also be omitted. For example, by reasonably increasing the volume of the gas-liquid separator 30, the gas-liquid separation effect can also be ensured. These adjustments do not deviate from the principle of the present invention and are all within the protection scope of the present invention.

[0038] As a possible implementation, the air-conditioning system further includes a second bypass pipe 70. One end of the second bypass pipe 70 is connected to the gas outlet 303, and the other end communicates with the gas pipe between the indoor heat exchanger 13 and the compressor 10. In the refrigeration mode, the gaseous refrigerant discharged from the gas-liquid separator 30 generally has a relatively low temperature and pressure. Mixing these gases with the low-temperature and low-pressure gaseous refrigerant after heat exchange in the indoor heat exchanger 13 can make the air-conditioning system more efficient during the circulation process. In addition, the refrigerant discharged from the gas-liquid separator 30 continues to participate in the heat exchange process, which can avoid waste of resources.

[0039] As a possible implementation, the gas-liquid separator 30 is disposed in the housing of the indoor unit, and the other end of the second bypass pipe 70 communicates with the gas port side of the indoor heat exchanger 13. Since the indoor heat exchanger 13 and the throttling element 12 of the air conditioner are both disposed in the housing of the indoor unit, therefore, in the present invention, the gas-liquid separator 30 is also disposed in the housing of the indoor unit, and the other end of the second bypass pipe 70 communicates with the refrigerant pipe on the gas port side of the indoor heat exchanger 13, so that the second bypass pipe 70 can be connected in the indoor unit, which can significantly shorten the length of the second bypass pipe 70, make the flow of the refrigerant in the air-conditioning system more efficient, reduce unnecessary heat exchange losses, and maintain a relatively stable temperature and pressure, thereby improving the refrigeration efficiency of the air conditioner.

[0040] As a possible implementation, a check valve 80 is provided on the second bypass pipe 70, and the check valve 80 is arranged to conduct the gas flowing out from the gas outlet 303. In this setting mode, in the refrigeration mode, it can avoid the gaseous refrigerant after heat exchange in the indoor heat exchanger 13 from returning to the gas-liquid separator 30 through the second bypass pipe 70, thereby affecting the separation efficiency of the gas-liquid separator 30, and does not prevent the gas discharged from the gas-liquid separator 30 from flowing through the second bypass pipe 70 into the gas pipe between the indoor heat exchanger 13 and the compressor 10. Or the check valve can be replaced by an air pump to promote the flow of the refrigerant in the second bypass pipe 70 into the gas pipe between the indoor heat exchanger 13 and the compressor 10. Or the second bypass pipe 70 can be omitted, and by adjusting the thickness of the second bypass pipe 70 and selecting a suitable gas-liquid separator 30 to adjust the gas pressure at the gas outlet 303, it is ensured that the refrigerant in the second bypass pipe 70 flows into the gas pipe between the indoor heat exchanger 13 and the compressor 10.

[0041] It should be noted that although the present invention is described by taking the other end of the second bypass pipe 70 communicating with the gas pipe between the indoor heat exchanger 13 and the compressor 10 as an example, this is not intended to limit the protection scope of the present invention. As long as it can make the gas discharged from the gas port of the gas-liquid separator 30, its setting mode can be adjusted. For example, the setting of the second bypass pipe 70 can be omitted, and a gas storage tank can be provided to receive the gas discharged from the gas-liquid separator 30, etc. These adjustments do not deviate from the principle of the present invention and are all within the protection scope of the present invention.

[0042] As a possible implementation, the air-conditioning system is a multi-connected air-conditioning system with multiple indoor units. It can be understood that an accumulator 30, a throttling element 12, and an indoor heat exchanger 13 are sequentially arranged on the refrigerant pipe inside the casing of the indoor unit. A first bypass pipe 40 with both ends communicating with both sides of the accumulator 30, a first valve body 50 arranged on the first bypass pipe 40, and a second valve body 60 arranged on the refrigerant pipeline between the liquid outlet 302 of the accumulator 30 and one end of the first bypass pipe 40 are also arranged in the casing of the indoor unit. The air-conditioning system is a multi-connected air-conditioning system with multiple indoor units, that is, one end of the refrigerant pipes inside the indoor units converges through a first converging structure, and the other ends of the refrigerant pipes inside the indoor units converge through a second converging structure. The first converging structure and the second converging structure are connected to the refrigerant pipes of the outdoor unit to form a closed loop. The converging structure can be a manifold, etc.

[0043] In a multi-connected air-conditioning system with multiple indoor units, multiple indoor units need to share an outdoor unit and a refrigerant circulation system. Different indoor units may have different load requirements. They may work simultaneously during certain periods, or only some indoor units may be enabled. Since the refrigerant is easily affected by load changes during the flowing process, the temperature and pressure fluctuations of the refrigerant are relatively large. This will cause the refrigerant to be in an easy gas-liquid two-phase mixed state when it enters the throttling element 12 of the indoor unit in the case of insufficient subcooling degree of the outdoor unit. Therefore, the present invention improves the multi-connected air-conditioning system, that is, an accumulator 30 is arranged in front of the throttling element 12 of the indoor unit, and a first bypass pipe 40, a first valve body 50, and a second valve body 60 are arranged in cooperation with the accumulator 30, which can ensure that the refrigerant remains in a liquid state when entering the throttling element 12, avoiding the noise and system efficiency decline caused by the gas-liquid mixed state. Of course, the air-conditioning system of the present invention can also be an air-conditioning system with only one indoor unit, and these adjustments do not deviate from the principle of the present invention and are within the protection scope of the present invention.

[0044] As a possible implementation, such as Figure 2 and Figure 3As shown in the figure, the gas-liquid separator 30 further includes a partition plate 304. The partition plate 304 is disposed inside the housing of the gas-liquid separator 30 and is located between the gas outlet 303 and the liquid outlet 302. A plurality of through holes are provided on the partition plate 304. When the refrigerant enters the gas-liquid separator 30, the liquid refrigerant will naturally settle to the bottom of the gas-liquid separator 30 under the action of gravity, while the gaseous refrigerant will flow upward. The setting of the partition plate 304 makes it more difficult for the liquid refrigerant to be entrained and lifted by the gaseous refrigerant because the liquid refrigerant needs to pass through the through holes on the partition plate 304 to reach the gaseous refrigerant area. Therefore, the above setting method can improve the efficiency of gas-liquid separation. Of course, the present invention can also omit the setting of the partition plate 304, and these adjustments do not deviate from the principle of the present invention and are all within the protection scope of the present invention.

[0045] The shape of the partition plate 304 of the present invention can be adaptively adjusted according to the shape of the housing of the gas-liquid separator 30, and it is preferably consistent with the shape of the housing of the gas-liquid separator 30. Usually, the housing of the gas-liquid separator 30 is cylindrical. In order to make an effective separation, the partition plate 304 is also set to be circular, and the outer wall of the partition plate 304 is completely attached to the inner wall of the housing of the gas-liquid separator 30. The setting method of the through holes on the partition plate 304 can be that a central hole is provided in the middle of the partition plate 304, and a plurality of circles of round holes are arranged at intervals outward with the central hole as the center in a concentric circle manner, and the round holes on each circle are distributed at intervals. Further, the holes are symmetrically distributed about the center. The above distribution method of the holes can effectively prevent the liquid from being entrained by the gas and passing through the partition plate 304, so that the liquid can better settle to the bottom of the gas-liquid separator 30, thereby improving the separation efficiency.

[0046] The present invention also provides a control method for an air-conditioning system. In this case, the control method is for the first valve body being a solenoid valve and the second valve body being a check valve. The control method includes the following steps:

[0047] Step S100: Control the reversing valve to perform a first action so that the refrigerant discharged from the compressor flows to the outdoor heat exchanger, and control the solenoid valve to close.

[0048] Step S200: Control the reversing valve to perform a second action so that the refrigerant discharged from the compressor flows to the indoor heat exchanger, and control the solenoid valve to open.

[0049] In step S100, control the reversing valve to perform the first action so that the refrigerant discharged from the compressor flows to the outdoor heat exchanger. That is, control the inlet of the reversing valve to communicate with the first port and the outlet to communicate with the second port, so that the air-conditioning system operates in the cooling mode. In this case, control the solenoid valve on the first bypass pipe to close, so as to prevent the refrigerant flowing out of the outdoor heat exchanger from directly flowing to the throttling element through the first bypass pipe, but all flow into the gas-liquid separator for gas-liquid separation. Furthermore, the refrigerant entering the throttling element 12 is in a liquid state, reducing the boiling noise. And since there is no need to adjust the opening of the throttling element 12, the original refrigeration performance of the air-conditioning system will not be affected.

[0050] In step S200, control the reversing valve to perform the second action so that the refrigerant discharged from the compressor flows to the indoor heat exchanger. That is, control the inlet of the reversing valve to communicate with the second port and the outlet to communicate with the first port, so that the air-conditioning system operates in the heating mode. In this case, control the solenoid valve on the first bypass pipe to open, so that the refrigerant flowing out of the throttling element directly flows to the outdoor heat exchanger through the first bypass pipe to participate in heat exchange. And since the check valve on the refrigerant pipeline between the liquid outlet and one end of the first bypass pipe can block the refrigerant flowing out of the throttling element and prevent the refrigerant from entering the gas-liquid separator, the liquid storage in the gas-liquid separator can be avoided, ensuring the heating performance of the system. In short, the above method enables the air-conditioning system to ensure the system performance in both the cooling and heating modes and can also reduce noise.

[0051] Those skilled in the art can understand that the above air-conditioning system includes some other well-known structures, such as a processor, a controller, a memory, etc. Among them, the memory includes but is not limited to random access memory, flash memory, read-only memory, programmable read-only memory, volatile memory, non-volatile memory, serial memory, parallel memory or registers, etc. The processor includes but is not limited to CPLD / FPGA, DSP, ARM processor, MIPS processor, etc. For the sake of not unnecessarily obscuring the embodiments of the present disclosure, these well-known structures are not shown in the drawings. The memory is adapted to store multiple program codes, and the program codes are adapted to be loaded and run by the processor to execute the control method of the air-conditioning system.

[0052] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that, Comprising: A compressor, an outdoor heat exchanger, a throttling element, and an indoor heat exchanger that are sequentially connected and form a closed loop; A reversing valve, the compressor is connected to the outdoor heat exchanger and the indoor heat exchanger through the reversing valve, and the reversing valve is used to switch the flow direction of the refrigerant discharged by the compressor so that the refrigerant can selectively flow to the outdoor heat exchanger or the indoor heat exchanger; A gas-liquid separator, which is connected between the outdoor heat exchanger and the throttling element, includes a gas-liquid inlet and a liquid outlet, the gas-liquid inlet is connected to the liquid port of the outdoor heat exchanger, and the liquid outlet is connected to the throttling element; A first bypass pipe, both ends of which are connected to the refrigerant pipelines on both sides of the gas-liquid separator; A first valve body, which is arranged on the first bypass pipe and is configured to block the refrigerant flowing out of the outdoor heat exchanger and conduct the refrigerant flowing out of the throttling element; A second valve body, which is arranged on the refrigerant pipeline between the liquid outlet and one end of the first bypass pipe and is configured to block the refrigerant flowing out of the throttling element and conduct the refrigerant flowing out of the liquid outlet.

2. The air-conditioning system according to claim 1, wherein: The gas-liquid separator further includes a gas outlet, and the gas outlet is used to discharge the gas in the gas-liquid separator.

3. The air-conditioning system according to claim 2, wherein: The air-conditioning system further includes a second bypass pipe, one end of the second bypass pipe is connected to the gas outlet, and the other end is connected to the air pipe between the indoor heat exchanger and the compressor.

4. The air-conditioning system according to claim 3, wherein: The gas-liquid separator is arranged in the casing of the indoor unit, and the other end of the second bypass pipe is connected to the air port side of the indoor heat exchanger.

5. The air-conditioning system according to claim 3, wherein: A check valve is arranged on the second bypass pipe, and the check valve is configured to conduct the gas flowing out of the gas outlet.

6. The air-conditioning system according to claim 2, wherein: The gas-liquid separator further includes a partition plate, the partition plate is arranged in the casing of the gas-liquid separator and is located between the gas outlet and the liquid outlet, and a plurality of through holes are arranged on the partition plate.

7. The air-conditioning system according to claim 1, wherein: The air-conditioning system is a multi-connected air-conditioning system with multiple indoor units.

8. The air-conditioning system according to claim 1, wherein: The first valve body is a check valve or a solenoid valve.

9. The air-conditioning system according to claim 1, wherein: The second valve body is a check valve or a solenoid valve.

10. A control method for an air conditioning system, characterized in that, The air-conditioning system includes: A compressor, an outdoor heat exchanger, a throttling element, and an indoor heat exchanger that are sequentially connected and form a closed loop; A reversing valve, the compressor is connected to the outdoor heat exchanger and the indoor heat exchanger through the reversing valve, and the reversing valve is used to switch the flow direction of the refrigerant discharged by the compressor so that the refrigerant can selectively flow to the outdoor heat exchanger or the indoor heat exchanger; The gas-liquid separator is connected between the outdoor heat exchanger and the throttling element, and includes a gas-liquid inlet and a liquid outlet. The gas-liquid inlet is connected to the liquid port of the outdoor heat exchanger, and the liquid outlet is connected to the throttling element; The first bypass pipe has both ends connected to the refrigerant pipelines on both sides of the gas-liquid separator; The solenoid valve is arranged on the first bypass pipe; The check valve is arranged on the refrigerant pipeline between the liquid outlet and one end of the first bypass pipe, and is configured to block the refrigerant flowing out of the throttling element and allow the refrigerant flowing out of the liquid outlet to pass through; The control method includes: Controlling the reversing valve to perform the first action so that the refrigerant discharged by the compressor flows to the outdoor heat exchanger, and controlling the solenoid valve to close; Controlling the reversing valve to perform the second action so that the refrigerant discharged by the compressor flows to the indoor heat exchanger, and controlling the solenoid valve to open.

Images