An air conditioner and a control method, a control device and a readable storage medium

Abstract

This invention provides an air conditioner and its control method, control device, and readable storage medium. The air conditioner includes: an indoor unit heat exchanger and an outdoor unit heat exchanger; a compressor disposed in the outdoor unit heat exchanger, the compressor having a refrigerant outlet and a refrigerant inlet; and a reversing assembly for switching the flow sequence of refrigerant between the indoor and outdoor unit heat exchangers after leaving the refrigerant outlet and before returning to the refrigerant inlet. The reversing assembly includes a first reversing valve and a second reversing valve; the first reversing valve controls the flow of refrigerant from the compressor to the outdoor unit heat exchanger; the second reversing valve controls the flow of refrigerant from the compressor to the indoor unit heat exchanger. By using two reversing valves, this invention enables unidirectional refrigerant flow, preventing accumulation within the same reversing valve. This avoids the simultaneous presence of two temperature states with significant temperature differences (hot and cold) within the reversing valve, reducing internal stress and valve body cracking, thereby extending the service life of the reversing valve.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioner, a control method, a control device, and a readable storage medium. Background Technology

[0002] Currently, air conditioners can achieve cooling and heating by adjusting the direction of the reversing valve. Whether cooling or heating, the refrigerant needs to pass through the reversing valve to change direction. High-temperature refrigerant flows out from one of the ports of the reversing valve, and low-temperature refrigerant flows back from one of the ports of the reversing valve. There are always two fluids with a large temperature difference passing through the reversing valve body.

[0003] Therefore, the valve body itself will also experience localized temperature unevenness, forming a temperature gradient, reducing the internal stress of the valve, and ultimately leading to material cracking and affecting the service life of the valve. Summary of the Invention

[0004] Therefore, embodiments of the present invention provide an air conditioner and a control method, control device and readable storage medium. By setting two reversing valves for joint control, the pipeline is optimized so that the refrigerant can flow in one direction and not accumulate in the same reversing valve. This avoids the simultaneous presence of two refrigerants with large temperature differences, namely hot and cold, in the reversing valve, thereby reducing the generation of internal stress in the reversing valve and the cracking of the reversing valve body, and thus extending the service life of the reversing valve.

[0005] Therefore, the first objective of the present invention is to provide an air conditioner;

[0006] The second objective of this invention is to provide a control method for an air conditioner;

[0007] A third objective of this invention is to provide a control device for an air conditioner;

[0008] A fourth objective of this invention is to provide a readable storage medium;

[0009] To achieve the first objective of this invention, an air conditioner is provided, comprising: an indoor unit heat exchanger and an outdoor unit heat exchanger; a compressor disposed in the outdoor unit heat exchanger, the compressor having a refrigerant outlet and a refrigerant inlet; and a reversing assembly for switching the order in which the refrigerant flows between the indoor unit heat exchanger and the outdoor unit heat exchanger after leaving the refrigerant outlet and before returning to the refrigerant inlet; wherein the reversing assembly includes a first reversing valve and a second reversing valve; the first reversing valve is used to control the flow of refrigerant from the compressor to the outdoor unit heat exchanger; and the second reversing valve is used to control the flow of refrigerant from the compressor to the indoor unit heat exchanger.

[0010] Compared with existing technologies, the technical effects achieved by this solution are as follows: The reversing assembly includes a first reversing valve and a second reversing valve; the first reversing valve controls the outdoor unit heat exchanger and is connected to either the refrigerant outlet or the refrigerant inlet; the second reversing valve controls the indoor unit heat exchanger and is connected to either the refrigerant outlet or the refrigerant inlet; through the setting of the two reversing valves, during cooling, the refrigerant flows from the compressor through the first reversing valve, sequentially through the outdoor unit heat exchanger and the indoor unit heat exchanger, and finally flows to the second reversing valve to be drawn back to the compressor, thus completing the cooling cycle; during heating, the refrigerant flows from the compressor through the second reversing valve, sequentially through the outdoor unit heat exchanger and the indoor unit heat exchanger, and finally flows to the second reversing valve to be drawn back to the compressor, thus completing the cooling cycle; The refrigerant flows through the indoor and outdoor heat exchangers and finally reaches the first reversing valve, where it is drawn back into the compressor, thus completing the heating cycle. By setting up two reversing valves for joint control, the refrigerant can achieve unidirectional flow without accumulating in the same reversing valve, without changing the air conditioner's cooling and heating functions. This overcomes the shortcomings of two refrigerants with large temperature differences passing through the same reversing valve, which would result in a forward or reverse cycle for cooling or heating. The refrigerant circulates along an optimized flow path, improving cooling / heating efficiency to some extent. At the same time, by optimizing the pipeline, temperature gradients in the reversing valves are avoided, thereby extending the service life of the reversing valves.

[0011] In one technical solution of the present invention, the first reversing valve and the second reversing valve are four-way valves with port D connected to the refrigerant outlet, port S connected to the refrigerant inlet, and port E closed, respectively; port C of the first reversing valve is connected to the outdoor unit heat exchanger; and port C of the second reversing valve is connected to the indoor unit heat exchanger.

[0012] Compared with existing technologies, the technical effects achieved by this solution are as follows: Four-way valves are mainly used in air conditioners. They have four ports connected to the piping: D, E, S, and C. These ports are respectively connected to the compressor's refrigerant outlet, the indoor unit's heat exchanger, the compressor's refrigerant inlet, and the outdoor unit's heat exchanger. The refrigerant in the compressor enters through port D of the four-way valve. During cooling, it flows out through port C, returns through port E, and is drawn back to the compressor through port S. During heating, it flows out through port E, returns through port C, and is drawn back to the compressor through port S. This application, however, uses two four-way valves, one of which closes port E. The first four-way valve's port C is connected to the outdoor unit's heat exchanger; the second four-way valve's port C is connected to the indoor unit... The heat exchangers are connected. During cooling, the refrigerant flows out through port C of the first four-way valve and returns through port C of the second four-way valve. After being drawn in through port S of the second four-way valve, it returns to the compressor. During heating, the refrigerant flows out through port C of the second four-way valve and returns through port C of the first four-way valve. After being drawn in through port S of the first four-way valve, it returns to the compressor. Port C of the first four-way valve is always connected to the outdoor unit heat exchanger, and port C of the second four-way valve is always connected to the indoor unit heat exchanger. The refrigerant achieves unidirectional flow and does not accumulate in the same four-way valve. This avoids the simultaneous presence of two refrigerant states with large temperature differences (hot and cold) in the four-way valve, reduces internal stress and valve body cracking, and thus extends the service life of the four-way valve.

[0013] In one technical solution of the present invention, the reversing assembly further includes: a first shut-off valve, which is disposed between the refrigerant outlet and port D of the first reversing valve.

[0014] Compared with existing technologies, the technical effects achieved by this solution are as follows: During refrigeration, the refrigerant in the compressor enters the D port of the first reversing valve through the exhaust port. By setting a first shut-off valve between the refrigerant outlet and the D port of the first reversing valve to control the refrigerant delivery, the refrigerant backflow is prevented, ensuring that the refrigerant in the pipeline can only flow forward. At the same time, it can also prevent refrigerant leakage and protect the pipeline and equipment from damage. On the other hand, the first shut-off valve facilitates precise control of the refrigerant flow and discharge, further improving refrigeration efficiency.

[0015] In one embodiment of the present invention, the reversing assembly further includes a second shut-off valve, which is located between the refrigerant outlet and the D port of the second reversing valve.

[0016] Compared with existing technologies, the technical effects achieved by this solution are as follows: During heating, the refrigerant in the compressor enters the D port of the second reversing valve through the exhaust port. By setting a second shut-off valve between the refrigerant outlet and the D port of the second reversing valve to control the refrigerant delivery, the refrigerant backflow is prevented, ensuring that the refrigerant in the pipeline can only flow forward. At the same time, it can also prevent refrigerant leakage and protect the pipeline and equipment from damage. On the other hand, the first shut-off valve facilitates flexible and reasonable control of the refrigerant flow delivery and discharge, further improving heating efficiency.

[0017] To achieve the second objective of this invention, a control method for an air conditioner is provided. The air conditioner includes an indoor unit heat exchanger, an outdoor unit heat exchanger, a compressor, a refrigerant outlet and a refrigerant inlet of the compressor, and a reversing assembly. The reversing assembly includes a first reversing valve and a second reversing valve. The first and second reversing valves are four-way valves, with port D connected to the refrigerant outlet, port S connected to the refrigerant inlet, and port E closed, respectively. Port C of the first reversing valve is connected to the outdoor unit heat exchanger. The second reversing valve... Port C is connected to the indoor unit heat exchanger; the control method of the air conditioner includes, in response to a command to control the air conditioner to operate in cooling mode, controlling the D port and C port of the first reversing valve to be connected, and the S port and E port to be connected, and controlling the D port and E port of the second reversing valve to be connected, and the C port and S port to be connected; and / or, in response to a command to control the air conditioner to operate in heating mode, controlling the D port and C port of the second reversing valve to be connected, and the S port and E port to be connected, and controlling the D port and E port of the first reversing valve to be connected, and the C port and S port to be connected.

[0018] Compared with the prior art, the technical effects achieved by this technical solution are as follows: During cooling, the control method of this application connects ports D and C, and ports S and E of the first reversing valve, allowing the refrigerant in the compressor to enter through port D and exit directly through port C. It also controls the second reversing valve to connect ports D and E, and ports C and S, connecting the indoor unit heat exchanger to the second reversing valve, allowing the refrigerant to reach port S through port C and be drawn back into the compressor. During heating, the second reversing valve connects ports D and C, and ports S and E, allowing the refrigerant in the compressor to enter through port D and exit directly through port C. Directly outward; control the first reversing valve to connect ports D and E, and ports C and S, so that when heating, the refrigerant can connect from the outdoor unit heat exchanger to the first reversing valve, and the refrigerant can reach the compressor through port C and be drawn back through port S; thus, during the operation of the air conditioner, high-temperature refrigerant and low-temperature refrigerant will not accumulate in the same reversing valve, but will flow unidirectionally through different reversing valves. Only one type of high-temperature or low-temperature refrigerant exists inside any reversing valve, there is no large temperature gradient, the internal stress is small, the risk of valve body deformation and cracking is small, the service life of the four-way valve is extended, and it can be adjusted according to the operating mode of the air conditioning system.

[0019] In one technical solution of the present invention, the reversing assembly further includes: a first shut-off valve, the first shut-off valve being disposed between the refrigerant outlet and port D of the first reversing valve; the control method further includes: in response to an instruction to control the air conditioner to operate in cooling mode, controlling the first shut-off valve to open; and / or in response to an instruction to control the air conditioner to operate in heating mode, controlling the first shut-off valve to close.

[0020] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: By setting the first shut-off valve between the refrigerant outlet and port D of the first reversing valve, the first shut-off valve is controlled to open in cooling mode and closed in heating mode, making the control simpler and the cost lower. It also allows for more precise control of the refrigerant flow, simplifies the system and control program, and improves the reliability of the air conditioner.

[0021] In one technical solution of the present invention, the reversing assembly further includes: a second shut-off valve, the second shut-off valve being disposed between the refrigerant outlet and the D port of the second reversing valve; the control method further includes: controlling the second shut-off valve to close in response to an instruction to control the air conditioner to operate in cooling mode; and / or controlling the second shut-off valve to open in response to an instruction to control the air conditioner to operate in heating mode.

[0022] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: By setting the second shut-off valve between the refrigerant outlet and the D port of the second reversing valve, the first shut-off valve is closed during cooling mode and opened during heating mode, making the control simpler and the cost lower. It also allows for more precise control of the refrigerant flow, simplifies the system and control program, and improves the reliability of the air conditioner.

[0023] To achieve the third objective of this invention, a control device for an air conditioner is provided. The air conditioner includes an indoor unit heat exchanger, an outdoor unit heat exchanger, a compressor, a refrigerant outlet and a refrigerant inlet of the compressor, and a reversing assembly. The reversing assembly includes a first reversing valve and a second reversing valve. The first and second reversing valves are four-way valves, with port D connected to the refrigerant outlet, port S connected to the refrigerant inlet, and port E closed, respectively. Port C of the first reversing valve is connected to the outdoor unit heat exchanger; port C of the second reversing valve is connected to the indoor unit heat exchanger. The control device of the air conditioner includes a cooling reversing module, which, in response to a command to control the air conditioner to operate in cooling mode, controls the D and C ports and the S and E ports of the first reversing valve to be connected, and controls the D and E ports and the C and S ports of the second reversing valve to be connected; and / or a heating reversing module, which, in response to a command to control the air conditioner to operate in heating mode, controls the D and C ports and the S and E ports of the second reversing valve to be connected, and controls the D and E ports and the C and S ports of the first reversing valve to be connected.

[0024] Compared with existing technologies, the technical effects achieved by this solution are as follows: The unidirectional piping structure design of the cooling reversing module and / or heating reversing module meets the refrigerant circulation requirements. During cooling, it controls the D and C ports and S and E ports of the first reversing valve to be connected, and controls the D and E ports and C and S ports of the second reversing valve to be connected. During heating, it controls the D and C ports and S and E ports of the second reversing valve to be connected, and controls the D and E ports and C and S ports of the first reversing valve to be connected. This eliminates unnecessary redundant connecting pipes and related pipe control components, avoiding situations where the indoor and outdoor heat exchangers over-cool due to complex pipe connection structures and excessively long control loops, or where insufficient heat exchange leads to poor performance in a certain operating mode. Furthermore, it effectively solves the existing technical problem of alternating hot and cold temperatures within the same reversing valve, resulting in insufficient heat exchange and difficulty in simultaneously achieving optimal performance in different cooling and heating operating modes.

[0025] To achieve the fourth objective of the present invention, the present invention provides a readable storage medium on which a program or instruction is stored, and when the program or instruction is executed by a processor, a control method that implements any of the above-mentioned methods is provided, thus including the beneficial effects of any of the above-mentioned technical methods, which will not be elaborated here.

[0026] By adopting the technical solution of the present invention, the following technical effects can be achieved:

[0027] (1) By setting two reversing valves for joint control, the refrigerant can achieve unidirectional flow without changing the air conditioning cooling and heating function, and avoid the refrigerant in the same reversing valve being in two different temperature states with large temperature differences at the same time. This reduces the internal stress of the reversing valve and the cracking of the reversing valve body, thereby extending the service life of the reversing valve.

[0028] (2) By setting up two reversing valves for joint control and using them to optimize the pipeline, unnecessary redundant connection pipelines and related pipeline control components are eliminated. This avoids the situation where the indoor unit heat exchanger and outdoor unit heat exchanger are over-cooled due to the complex pipeline connection structure and the excessively long control loop, or the situation where insufficient heat exchange occurs, resulting in poor performance in a certain working mode. It also effectively solves the existing technical problem of alternating between cold and hot in the same reversing valve, which leads to insufficient heat exchange and makes it difficult to take into account the performance of different working modes of cooling and heating.

[0029] (3) By setting a shut-off valve, the refrigerant can be prevented from flowing back and ensured that the refrigerant in the pipeline can only flow forward. At the same time, the refrigerant can be prevented from leaking and the pipeline and equipment can be protected from damage. On the other hand, the shut-off valve can facilitate flexible and reasonable control of the refrigerant flow and discharge, further improving the cooling / heating efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a refrigeration control method for an air conditioner provided in Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of a heating control method for an air conditioner provided in Embodiment 2 of the present invention;

[0033] Explanation of reference numerals in the attached figures:

[0034] 100: Indoor unit heat exchanger, 200: Outdoor unit heat exchanger, 300: Compressor, 310: Refrigerant outlet, 320: Refrigerant inlet, 400: Reversing assembly, 410: First reversing valve, 411: Slider A, 420: Second reversing valve, 421: Slider B, 430: First shut-off valve, 440: Second shut-off valve, 500: Throttling device. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Reversing valves are mainly used in air conditioners. Their function is to change the flow direction of refrigerant in the system to change the function of the air conditioner, thereby switching between cooling, heating, or defrosting functions.

[0037] Currently, the commonly used reversing valve is the four-way valve. The four-way valve has ports D, E, S, and C, which are connected to the compressor's refrigerant outlet, the indoor unit's heat exchanger, the compressor's refrigerant inlet, and the outdoor unit's heat exchanger, respectively. High-temperature refrigerant flows out from one of the ports of the four-way valve, while low-temperature refrigerant flows back from the other port. For example, refrigerant in the compressor enters through port D of the four-way valve. During cooling, it flows out through port C, returns through port E, and is drawn back to the compressor through port S. During heating, it flows out through port E, returns through port C, and is drawn back to the compressor through port S. In this situation, two fluids with significantly different temperatures are always passing through the valve body, resulting in localized temperature unevenness within the valve body itself. This creates a temperature gradient, generating stress and ultimately leading to material breakage and affecting the valve's lifespan.

[0038] Therefore, this application provides an air conditioner including: an indoor unit heat exchanger 100 and an outdoor unit heat exchanger 200; a compressor 300 having a refrigerant outlet 310 and a refrigerant inlet 320; and a reversing assembly 400 for switching the order in which the refrigerant flows between the indoor unit heat exchanger 100 and the outdoor unit heat exchanger 200 after leaving the refrigerant outlet 310 and before returning to the refrigerant inlet 320; wherein, the reversing assembly 400 includes a first reversing valve 410 and a second reversing valve 420; the first reversing valve 410 is used to control the flow of refrigerant in the compressor 300 to the outdoor unit heat exchanger 200; and the second reversing valve 420 is used to control the flow of refrigerant in the compressor 300 to the indoor unit heat exchanger 100.

[0039] For example, the first reversing valve 410 and the second reversing valve 420 are four-way valves with port D connected to the refrigerant outlet 310, port S connected to the refrigerant inlet 320, and port E closed, respectively; port C of the first reversing valve 410 is connected to the outdoor unit heat exchanger 200; port C of the second reversing valve 420 is connected to the indoor unit heat exchanger 100.

[0040] Furthermore, a first shut-off valve 430 is located between the refrigerant outlet 310 and port D of the first reversing valve 410; a second shut-off valve 440 is located between the refrigerant outlet 310 and port D of the second reversing valve 420.

[0041] Preferably, the system uses two four-way valves, with the E port of the first four-way valve closed. The C port of the first four-way valve is connected to the outdoor unit heat exchanger 200; the C port of the second four-way valve is connected to the indoor unit heat exchanger 100. During cooling, refrigerant flows out through the C port of the first four-way valve and returns through the C port of the second four-way valve, then is drawn back to the compressor 300 via the S port of the second four-way valve. During heating, refrigerant flows out through the C port of the second four-way valve and returns through the C port of the first four-way valve, then is drawn back to the compressor 300 via the S port of the first four-way valve. The C port of the first four-way valve is always connected to the outdoor unit heat exchanger 200, and the C port of the second four-way valve is always connected to the indoor unit heat exchanger 100. The heat exchanger 100 is connected to the refrigerant, which flows in one direction and does not accumulate in the same four-way valve. This avoids the simultaneous presence of two refrigerants with large temperature differences (hot and cold) in the four-way valve, reducing internal stress and valve body cracking, thus extending the valve's service life. Simultaneously, the first shut-off valve 430 and the second shut-off valve 440 control the refrigerant flow. This prevents backflow, ensuring the refrigerant in the pipes flows only forward, and also prevents leakage, protecting the pipes and equipment from damage. Furthermore, the first shut-off valve 430 allows for precise control of the refrigerant flow, further improving refrigeration efficiency.

[0042] Furthermore, the present invention provides a control method for an air conditioner, comprising: responding to a command to control the air conditioner to operate in cooling mode, controlling the D port and C port of the first reversing valve 410 to be open, and the S port and E port to be open, and controlling the D port and E port of the second reversing valve 420 to be open, and the C port and S port to be open; controlling the first reversing valve 410 to connect the outdoor unit heat exchanger 200 to the refrigerant inlet 320, and controlling the second reversing valve 420 to connect the indoor unit heat exchanger 100... Connect to refrigerant outlet 310; and / or in response to a command to control the air conditioner to operate in heating mode, control the D port and C port of the second reversing valve 420 to be connected, and the S port and E port to be connected, and control the D port and E port and the C port and S port of the first reversing valve 410 to be connected; control the second reversing valve 420 to connect the indoor unit heat exchanger 100 to the refrigerant inlet 320, and control the first reversing valve 410 to connect the outdoor unit heat exchanger 200 to the refrigerant outlet 310.

[0043] Preferably, the reversing assembly 400 further includes: a first shut-off valve 430, which is disposed between the refrigerant outlet 310 and port D of the first reversing valve 410; and a second shut-off valve 440, which is disposed between the refrigerant outlet 310 and port D of the second reversing valve 420. The control method further includes: in response to a command to control the air conditioner to operate in cooling mode, controlling the first shut-off valve 430 to open and the second shut-off valve 440 to close; and / or in response to a command to control the air conditioner to operate in heating mode, controlling the first shut-off valve 430 to close and the second shut-off valve 440 to open.

[0044] Preferably, during cooling, the first reversing valve 410 is connected via ports D and C, and ports S and E, allowing the refrigerant in the compressor 300 to enter through port D and exit directly through port C. The second reversing valve 420 is controlled to connect ports D and E, and ports C and S, connecting the indoor unit heat exchanger 100 to the second reversing valve 420, allowing the refrigerant to reach port S through port C and be drawn back into the compressor 300. During heating, the second reversing valve 420 is connected via ports D and C, and ports S and E, allowing the refrigerant in the compressor 300 to enter through port D and exit directly through port C. The first reversing valve 410 is controlled to connect ports D and E, and ports S and E, connecting the indoor unit heat exchanger 100 to the second reversing valve 420, allowing the refrigerant in the compressor 300 to enter through port D and exit directly through port C. Ports C and S are connected, allowing refrigerant to connect from the outdoor unit heat exchanger 200 to the first reversing valve 410 during heating. The refrigerant can then reach the compressor 300 via port C and be drawn back through port S. As can be seen from the above, regardless of heating or cooling mode, only one type of refrigerant exists in either high or low temperature state within each reversing valve, eliminating a large temperature gradient, reducing internal stress, minimizing the risk of valve body deformation and cracking, extending the service life of the reversing valve, and allowing adjustment according to the air conditioning system's operating mode. The shut-off valve simplifies control, lowers costs, and allows for more precise control of refrigerant flow, simplifying the system and control procedures and improving the reliability of the air conditioner.

[0045] Furthermore, the present invention provides a control device for an air conditioner comprising: a refrigeration reversing module, which, in response to a command to control the air conditioner to operate in refrigeration mode, controls the D and C ports and the S and E ports of a first reversing valve 410 to be open, and controls the D and E ports and the C and S ports of a second reversing valve 420 to be open, such that the first reversing valve 410 connects the outdoor unit heat exchanger 200 to the refrigerant inlet 320, and the second reversing valve 420 connects the indoor unit heat exchanger 100 to the refrigerant inlet 320. The refrigerant outlet 310 is open; and / or the heating reversing module, in response to the command to control the air conditioner to operate in heating mode, controls the D port and C port of the second reversing valve 420 to be open, and the S port and E port to be open, and controls the D port and E port and the C port and S port of the first reversing valve 410 to be open, so that the second reversing valve 420 connects the indoor unit heat exchanger 100 with the refrigerant inlet 320, and controls the first reversing valve 410 connects the outdoor unit heat exchanger 200 with the refrigerant outlet 310.

[0046] Preferably, the design of the unidirectional piping structure of the cooling reversing module and / or heating reversing module meets the requirements of refrigerant circulation. Simultaneously, during cooling, the first reversing valve 410 is controlled to connect ports D and C, and ports S and E, and the second reversing valve 420 is controlled to connect ports D and E, and ports C and S. During heating, the second reversing valve 420 is controlled to connect ports D and C, and ports S and E, and the first reversing valve 410 is controlled to connect ports D and E, and ports C and S. This eliminates unnecessary redundant connecting pipes and related pipe control components, avoiding excessive cooling in the indoor unit heat exchanger 100 and outdoor unit heat exchanger 200 due to complex pipe connection structures and excessively long control loops, or insufficient heat exchange leading to poor performance in a certain operating mode. Furthermore, it effectively solves the existing technical problem of alternating between cooling and heating in the same reversing valve, resulting in insufficient heat exchange and difficulty in simultaneously achieving the desired performance in different cooling and heating operating modes.

[0047] [First Embodiment]

[0048] This embodiment provides a method for air conditioning cooling, such as... Figure 1 As shown, the specific steps are as follows:

[0049] The air conditioner includes an indoor unit heat exchanger 100, an outdoor unit heat exchanger 200, a throttling device 500, a compressor 300, a refrigerant outlet 310 and a refrigerant inlet 320 of the compressor 300, and a reversing assembly 400. The reversing assembly 400 includes a first reversing valve 410 and a second reversing valve 420. The first reversing valve 410 is used to control the outdoor unit heat exchanger 200 and is connected to one of the refrigerant outlet 310 and the refrigerant inlet 320. The second reversing valve 420 is used to control the indoor unit heat exchanger 100 and is connected to one of the refrigerant outlet 310 and the refrigerant inlet 320.

[0050] The first reversing valve 410 and the second reversing valve 420 are four-way valves, with port D connected to the refrigerant outlet 310, port S connected to the refrigerant inlet 320, and port E closed. Port C of the first reversing valve 410 is connected to the outdoor unit heat exchanger 200; port C of the second reversing valve 420 is connected to the indoor unit heat exchanger 100; the first shut-off valve 430 is located between the refrigerant outlet 310 and port D of the first reversing valve 410; and the second shut-off valve 440 is located between the refrigerant outlet 310 and port D of the second reversing valve 420.

[0051] When cooling is required indoors, the second shut-off valve 440 closes, the first shut-off valve 430 opens, and the high-temperature refrigerant flows from the compressor 300 to the first reversing valve 410; the first reversing valve 410 is de-energized, the second reversing valve 420 is energized, and the slider A411 remains as before. Figure 1 In the preset cooling state, the first reversing valve 410 is controlled to connect ports D and C, and ports S and E, and the second reversing valve 420 is controlled to connect ports D and E, and ports C and S. At this time, the high-temperature refrigerant discharged from the compressor 300 passes through the first shut-off valve 430, enters through port D of the first reversing valve 410, and exits directly through port C, flowing to the outdoor unit heat exchanger 200. After condensation, it flows through the throttling device 500 to the indoor unit heat exchanger 100, thus achieving cooling. The low-temperature refrigerant after cooling and heat exchange flows to port C of the second reversing valve 420 and reaches port S to be drawn back to the compressor 300.

[0052] [Second Embodiment]

[0053] This embodiment provides a heating method for an air conditioner, such as... Figure 2 As shown, the specific steps are as follows:

[0054] The air conditioner includes an indoor unit heat exchanger 100, an outdoor unit heat exchanger 200, a throttling device 500, a compressor 300, a refrigerant outlet 310 and a refrigerant inlet 320 of the compressor 300, and a reversing assembly 400. The reversing assembly 400 includes a first reversing valve 410 and a second reversing valve 420. The first reversing valve 410 is used to control the outdoor unit heat exchanger 200 and is connected to one of the refrigerant outlet 310 and the refrigerant inlet 320. The second reversing valve 420 is used to control the indoor unit heat exchanger 100 and is connected to one of the refrigerant outlet 310 and the refrigerant inlet 320.

[0055] The first reversing valve 410 and the second reversing valve 420 are four-way valves, with port D connected to the refrigerant outlet 310, port S connected to the refrigerant inlet 320, and port E closed. Port C of the first reversing valve 410 is connected to the outdoor unit heat exchanger 200; port C of the second reversing valve 420 is connected to the indoor unit heat exchanger 100; the first shut-off valve 430 is located between the refrigerant outlet 310 and port D of the first reversing valve 410; and the second shut-off valve 440 is located between the refrigerant outlet 310 and port D of the second reversing valve 420.

[0056] When indoor heating is required, the first shut-off valve 430 is closed and the second shut-off valve 440 is opened, allowing high-temperature refrigerant to flow from the compressor 300 to the second reversing valve 420. The second reversing valve 420 is de-energized, the first reversing valve 410 is energized, and slider B421 remains in its normal position. Figure 2 In the preset heating state, the D port and C port of the second reversing valve 420 are connected, and the S port and E port are connected. The D port and E port of the first reversing valve 410 are connected, and the C port and S port are connected. At this time, the high-temperature refrigerant discharged from the compressor 300 passes through the second shut-off valve 440, enters through the D port of the second reversing valve 420, and exits directly through the C port. It flows to the indoor unit heat exchanger 100, condenses, and then flows to the outdoor unit heat exchanger 200 after the throttling device 500, thus achieving heating. After the heating is completed, the low-temperature refrigerant flows to the C port of the first reversing valve 410 and reaches the S port to be drawn back to the compressor 300.

[0057] [First Pair Proportion]

[0058] This comparative example provides a cooling method for an air conditioner, the specific steps of which are as follows:

[0059] An air conditioner includes an indoor unit heat exchanger, an outdoor unit heat exchanger, a throttling device, a compressor, a refrigerant outlet and a refrigerant inlet of the compressor, a four-way valve, and a shut-off valve;

[0060] The four-way valve has ports D, E, S and C, which are respectively connected to the refrigerant outlet of the compressor, the indoor unit heat exchanger, the refrigerant inlet of the compressor and the outdoor unit heat exchanger. The shut-off valve is located between the refrigerant outlet and port D of the four-way valve.

[0061] When the air conditioner is in cooling mode, the shut-off valve opens, the four-way valve is energized, and the high-temperature refrigerant discharged by the compressor passes through the shut-off valve, enters through port D of the four-way valve, flows out through port C, flows to the outdoor unit heat exchanger, condenses and flows to the indoor unit heat exchanger after the throttling device, thus achieving cooling. After cooling is completed, the low-temperature refrigerant flows to port E of the four-way valve and reaches port S to be drawn back to the compressor.

[0062] [Second Pair Proportion]

[0063] This comparative example provides a heating method for an air conditioner, the specific steps of which are as follows:

[0064] An air conditioner includes an indoor unit heat exchanger, an outdoor unit heat exchanger, a throttling device, a compressor, a refrigerant outlet and a refrigerant inlet of the compressor, a four-way valve, and a shut-off valve;

[0065] The four-way valve has ports D, E, S and C, which are respectively connected to the refrigerant outlet of the compressor, the indoor unit heat exchanger, the refrigerant inlet of the compressor and the outdoor unit heat exchanger. The shut-off valve is located between the refrigerant outlet and port D of the four-way valve.

[0066] When the air conditioner is in cooling mode, the shut-off valve opens, the four-way valve is energized, and the compressor discharges high-temperature refrigerant through the shut-off valve, through port D of the four-way valve, and out through port E. The refrigerant flows to the indoor unit heat exchanger, condenses, and then flows to the outdoor unit heat exchanger after the throttling device, thus achieving heating. After heating is completed, the low-temperature refrigerant flows to port C of the four-way valve and reaches port S to be drawn back to the compressor.

[0067] From Examples 1-2 and Comparative Examples 1-2, we can conclude that:

[0068] In Comparative Examples 1-2, during cooling or heating, the refrigerant needs to pass through the reversing valve to change direction. The high-temperature refrigerant flows out from one of the ports of the reversing valve, and the low-temperature refrigerant flows back from one of the ports. Since there are always two fluids with a large temperature difference passing through the reversing valve body, the valve body itself will also have local temperature unevenness, forming a temperature gradient, which will generate stress, eventually leading to material cracking and affecting the service life of the reversing valve.

[0069] In embodiments 1-2, during cooling or heating, the refrigerant is unidirectionally circulated without accumulating in the same refrigerant valve by changing the layout of the reversing valve pipeline and optimizing the pipeline, and by using two reversing valves for joint control. This avoids the simultaneous presence of two refrigerant states with large temperature differences, such as hot and cold, in the reversing valve, thereby reducing internal stress and valve body cracking, and extending the service life of the reversing valve.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioner, characterized in that, The air conditioner includes: Indoor unit heat exchanger (100) and outdoor unit heat exchanger (200); A compressor (300) is disposed in the outdoor unit heat exchanger (200), the compressor (300) having a refrigerant outlet (310) and a refrigerant inlet (320). A reversing assembly (400) is used to switch the order in which the refrigerant of the air conditioner flows between the indoor unit heat exchanger (100) and the outdoor unit heat exchanger (200). The reversing assembly (400) includes a first reversing valve (410) and a second reversing valve (420). The first reversing valve (410) is used to control the flow of refrigerant in the compressor (300) to the outdoor unit heat exchanger (200). The second reversing valve (420) is used to control the flow of refrigerant in the compressor (300) to the indoor unit heat exchanger (100). The first reversing valve (410) and the second reversing valve (420) are four-way valves with port D connected to the refrigerant outlet (310), port S connected to the refrigerant inlet (320), and port E closed, respectively. The C port of the first reversing valve (410) is connected to the outdoor unit heat exchanger (200); The C port of the second reversing valve (420) is connected to the indoor unit heat exchanger (100).

2. The air conditioner according to claim 1, characterized in that, The commutation assembly (400) further includes: The first shut-off valve (430) is located between the refrigerant outlet (310) and port D of the first reversing valve (410).

3. The air conditioner according to claim 1, characterized in that, The commutation assembly (400) further includes: The second shut-off valve (440) is located between the refrigerant outlet (310) and port D of the second reversing valve (420).

4. A control method for an air conditioner, characterized in that, The control method is used to control the air conditioner as described in claim 3, and the control method includes: In response to a command to control the air conditioner to operate in cooling mode, the first reversing valve is controlled to connect ports D and C, and ports S and E, and the second reversing valve is controlled to connect ports D and E, and ports C and S; and / or In response to a command to control the air conditioner to operate in heating mode, the D port and C port of the second reversing valve are connected, and the S port and E port are connected, and the D port and E port of the first reversing valve are connected, and the C port and S port are connected.

5. The control method according to claim 4, characterized in that, The reversing assembly further includes: a first shut-off valve, the first shut-off valve being disposed between the refrigerant outlet and port D of the first reversing valve; the control method further includes: In response to a command to control the air conditioner to operate in cooling mode, the first shut-off valve is opened; and / or In response to a command to control the air conditioner to operate in heating mode, the first shut-off valve is controlled to close.

6. The control method according to claim 4, characterized in that, The reversing assembly further includes: a second shut-off valve, the second shut-off valve being disposed between the refrigerant outlet and port D of the second reversing valve; the control method further includes: In response to a command to control the air conditioner to operate in cooling mode, the second shut-off valve is controlled to close; and / or In response to a command to control the air conditioner to operate in heating mode, the second shut-off valve is opened.

7. A control device for an air conditioner, characterized in that, The control device is used to control the air conditioner as described in claim 3, and the control device includes: A cooling reversing module, in response to a command to control the air conditioner to operate in cooling mode, controls the D port and C port of the first reversing valve (410) to be open, and the S port and E port to be open, and controls the D port and E port and the C port and S port of the second reversing valve (420) to be open; and / or The heating reversing module responds to the instruction to control the air conditioner to operate in heating mode by controlling the D port and C port of the second reversing valve (420) to be connected, and the S port and E port to be connected, and controls the D port and E port and the C port and S port of the first reversing valve (410) to be connected.

8. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the control method as described in any one of claims 4 to 6.

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