An air conditioner and a control method of the air conditioner

Abstract

The application provides an air conditioner and a control method of the air conditioner, and the air conditioner comprises: a compressor, a four-way reversing valve, an indoor heat exchanger, a throttling device, an outdoor heat exchanger and a liquid accumulator connected in sequence, wherein the compressor is provided with a discharge port and a suction port; a first reversing valve, the first reversing valve has a first inlet, a first outlet and a second outlet; a second reversing valve, the second reversing valve has a second inlet, a third outlet, a fourth outlet and a fifth outlet; wherein the compressor is used for driving refrigerant to circulate in a refrigerant circulation loop; by controlling the opening and closing of the outlets of the first reversing valve and the second reversing valve, different flow directions of the refrigerant are realized, so that the air conditioner is controlled not to enter a defrosting state in a heating mode. The application solves the technical problem that the heat pump type air conditioner is mostly defrosted frequently in the heating mode, resulting in poor user experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner and a control method of the air conditioner. BACKGROUND

[0002] With the development of economy and the continuous improvement of living standards, users have higher and higher requirements for the heating capacity and heating comfort of air conditioners. In winter, in the areas without heating, air conditioners are mostly used for indoor temperature regulation, but at present, the heat pump type air conditioners on the market mostly have the problem of frequent defrosting in the heating mode. During defrosting, the air conditioner runs in the cooling mode and cannot provide heat on the indoor side, resulting in poor user experience. SUMMARY

[0003] The present application solves the technical problem that the heat pump type air conditioner mostly has the problem of frequent defrosting in the heating mode, resulting in poor user experience.

[0004] To solve the above problems, the present application provides an air conditioner, comprising: a compressor, a four-way reversing valve, an indoor heat exchanger, a throttling device, an outdoor heat exchanger and a liquid accumulator connected in sequence, the compressor being provided with an exhaust port and a suction port; a first reversing valve, the first reversing valve having a first inlet, a first outlet and a second outlet, wherein the first inlet is connected to the exhaust port, the first outlet is connected to the four-way reversing valve, and the second outlet is connected to the outdoor heat exchanger; a second reversing valve, the second reversing valve having a second inlet, a third outlet, a fourth outlet and a fifth outlet, wherein the second inlet is connected to the outdoor heat exchanger, the third outlet is connected to the four-way reversing valve, the fourth outlet is connected to the liquid accumulator, and the fifth outlet is connected to the throttling device; wherein the compressor is used to drive the refrigerant to circulate in the refrigerant circulation loop; by controlling the opening and closing of the outlets of the first reversing valve and the second reversing valve, different flow directions of the refrigerant are realized, so that the air conditioner is controlled not to enter the defrosting state in the heating mode.

[0005] Compared with the prior art, the technical effects achieved by adopting the technical scheme are: on the basis of the current mainstream heat pump air conditioner, the heating circulation process is optimized, the first reversing valve and the second reversing valve are added in the middle section between the compressor and the condenser, by controlling the opening and closing of the outlets of the first reversing valve and the second reversing valve, different flow directions of the refrigerant are realized, so that the air conditioner is controlled not to enter the defrosting state in the heating mode, and stable heating effect can be provided.

[0006] In one embodiment of the present invention, when the air conditioner is in heating mode, when the first outlet is open, refrigerant flows from the exhaust port sequentially to the first reversing valve, the four-way reversing valve, and the indoor heat exchanger; and / or when the second outlet is open, refrigerant flows from the exhaust port sequentially to the first reversing valve and the outdoor heat exchanger to preheat the outdoor heat exchanger; and / or when the third outlet is open, refrigerant flowing through the second reversing valve flows through the third outlet to the four-way reversing valve; and / or when the fourth outlet is open, refrigerant flowing through the second reversing valve flows through the fourth outlet to the liquid receiver and flows back to the compressor for heating; and / or when the fifth outlet is open, refrigerant flowing through the second reversing valve flows through the fifth outlet to the throttling device.

[0007] Compared with the existing technology, the technical effects achieved by adopting this technical solution are as follows: The first reversing valve has one inlet and two outlets. The first inlet is connected to the compressor exhaust port, the first outlet is connected to the four-way reversing valve, and the second outlet is connected to the outdoor heat exchanger; the second reversing valve has one inlet and two outlets. The second inlet is connected to the outlet pipe of the outdoor heat exchanger, the third outlet is connected to the four-way reversing valve, the fourth outlet is connected to the liquid receiver, and the fifth outlet is connected to the throttling device. When the air conditioner is in heating mode, the refrigerant circulation direction is compressor-indoor heat exchanger-outdoor heat exchanger-compressor. When the first outlet is open, the refrigerant's path from the compressor to the four-way reversing valve is augmented by the first reversing valve. The refrigerant flows from the exhaust port sequentially to the first reversing valve, then the four-way reversing valve, and finally to the indoor heat exchanger. When the second outlet is open, the refrigerant flows from the exhaust port preferentially to the first reversing valve and the outdoor heat exchanger, preheating the outdoor heat exchanger and effectively preventing frost formation at low temperatures. When the third outlet is open, the refrigerant flowing through the second reversing valve flows through the third outlet to the four-way reversing valve. When the fourth outlet is open, the refrigerant flowing through the second reversing valve flows through the fourth outlet to the receiver, returning to the compressor for heating, thus improving heat exchange capacity and efficiency. When the fifth outlet is open, the refrigerant flowing through the second reversing valve flows through the fifth outlet to the throttling device.

[0008] In one embodiment of the present invention, in heating mode, when the first outlet and the fifth outlet are in the open state and the second outlet, the third outlet and the fourth outlet are in the closed state, the refrigerant discharged from the exhaust port flows sequentially through the first reversing valve and the four-way reversing valve, and enters the indoor heat exchanger to release heat.

[0009] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: when the first and fifth outlets are open and the second, third, and fourth outlets are closed, the heat from the compressor exhaust directly enters the inner side (i.e., the indoor heat exchanger) through the four-way reversing valve to release heat, and the air conditioner can heat normally without frost.

[0010] In one embodiment of the present invention, in heating mode, when the second outlet and the third outlet are in the open state and the first outlet, the fourth outlet and the fifth outlet are in the closed state, the refrigerant discharged from the exhaust port flows sequentially through the first reversing valve, the outdoor heat exchanger, the second reversing valve and the four-way reversing valve to preheat the outdoor heat exchanger and then enter the indoor heat exchanger to release heat.

[0011] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: when the second and third outlets are open and the first, fourth, and fifth outlets are closed, the heat from the compressor exhaust first heats part of the copper tubes of the condenser (i.e., the outdoor heat exchanger), driving the surrounding pipes to heat up, and then enters the inner side (i.e., the indoor heat exchanger) through the four-way reversing valve to release heat. The condenser (i.e., the outdoor heat exchanger) is preheated and does not frost up when heating.

[0012] In one embodiment of the present invention, in heating mode, when the second outlet, the third outlet and the fourth outlet are in the open state and the first outlet and the fifth outlet are in the closed state, the refrigerant discharged from the exhaust port flows sequentially through the first reversing valve, the outdoor heat exchanger and the second reversing valve, and a portion of the refrigerant is diverted to the liquid receiver at the second reversing valve.

[0013] Compared with existing technologies, the technical effects achieved by this solution are as follows: When the second, third, and fourth outlets are open and the first and fifth outlets are closed, the heat from the compressor exhaust first heats part of the copper tubes of the condenser (i.e., the outdoor heat exchanger), driving the surrounding pipes to heat up. Then, it enters the inner side (i.e., the indoor heat exchanger) through the four-way reversing valve to release heat. The condenser (i.e., the outdoor heat exchanger) is preheated and does not frost while heating. At the same time, part of the refrigerant circulates back into the compressor to reheat, increasing the heat exchange capacity of the indoor side (i.e., the indoor heat exchanger) and raising the indoor air outlet temperature.

[0014] In another aspect, the present invention provides a control method for an air conditioner, the control method comprising: in heating mode, acquiring the external coil temperature and the internal ring temperature of the air conditioner; and controlling the opening and closing of the outlets of the first reversing valve and the second reversing valve according to the magnitude of the external coil temperature and the internal ring temperature, thereby controlling the flow direction of the refrigerant in the refrigerant circulation loop.

[0015] Compared with existing technologies, the technical effects achieved by this solution are as follows: the external coil temperature of the air conditioner indicates the likelihood of it entering defrost mode in heating mode; the internal coil temperature indicates the indoor temperature, thus allowing for assessment of the air conditioner's heating performance. Based on the external and internal coil temperatures, the likelihood of the air conditioner entering defrost mode in heating mode and its heating performance can be determined. By controlling the opening and closing of the outlets of the first and second reversing valves, the flow direction of the refrigerant in the refrigerant circulation loop is controlled, enabling the air conditioner to operate without defrosting in heating mode and providing a stable heating effect.

[0016] In one embodiment of the present invention, the opening and closing of the outlets of the first reversing valve and the second reversing valve are controlled according to the outer disc temperature and the inner ring temperature, thereby controlling the flow direction of the refrigerant in the refrigerant circulation loop. This includes: controlling the opening and closing of the outlets of the first reversing valve and the second reversing valve according to the outer disc temperature and the first outer disc preset temperature; controlling the first outlet and the fifth outlet to be in an open state when the outer disc temperature is greater than the first outer disc preset temperature; and / or controlling the opening and closing of the outlets of the first reversing valve and the second reversing valve according to the outer disc temperature and the second outer disc preset temperature when the outer disc temperature is less than or equal to the first outer disc preset temperature; wherein the first outer disc preset temperature is greater than the second outer disc preset temperature.

[0017] Compared to existing technologies, the technical advantages of this solution are as follows: By prioritizing the determination of whether the outer plate temperature is greater than the first preset outer plate temperature before determining whether to compare the outer plate temperature with the second preset outer plate temperature, this design in the control method saves steps, reduces unnecessary judgment and detection steps, and makes the control process more efficient. When the outer plate temperature is greater than the first preset outer plate temperature, the air conditioner is less likely to enter defrost mode, and the compressor exhaust heat directly enters the inner side for heat release through the four-way reversing valve, allowing the air conditioner to heat normally without frosting.

[0018] In one embodiment of the present invention, when the outer plate temperature is less than or equal to the first outer plate preset temperature, the opening and closing of the outlets of the first reversing valve and the second reversing valve are controlled according to the magnitude of the outer plate temperature and the second outer plate preset temperature, including: when the outer plate temperature is greater than or equal to the second outer plate preset temperature, controlling the second outlet and the third outlet to be in an open state; and / or when the outer plate temperature is less than the second outer plate preset temperature, controlling the second outlet and the third outlet to be in an open state, and controlling the opening and closing of the fourth outlet according to the magnitude of the inner ring temperature and the inner ring preset temperature.

[0019] Compared with existing technologies, the technical effects achieved by this solution are as follows: When the outer plate temperature is less than or equal to the first preset outer plate temperature, the difference between the second and third preset outer plate temperatures is further determined. If the outer plate temperature is less than or equal to the first preset outer plate temperature, it indicates that the outer plate temperature is relatively low, and the air conditioner may enter defrost mode. When the outer plate temperature is less than the second preset outer plate temperature, the opening and closing of the fourth outlet, which is connected to the liquid receiver, needs to be controlled based on the inner ring temperature and the inner ring preset temperature.

[0020] In one embodiment of the present invention, when the outer ring temperature is lower than the second outer ring preset temperature, the opening and closing of the fourth outlet is controlled according to the inner ring temperature and the inner ring preset temperature, including: when the inner ring temperature is lower than the inner ring preset temperature, the fourth outlet is controlled to be in an open state.

[0021] Compared with existing technologies, the technical effects achieved by this solution are as follows: If the inner ring temperature is lower than the preset inner ring temperature, the fourth outlet is kept open, indicating that the indoor temperature is low and the heating effect of the air conditioner needs to be improved. By opening the fourth outlet, some refrigerant is allowed to circulate back into the compressor through the fourth opening to reheat, thereby increasing the heat exchange capacity of the indoor heat exchanger and thus increasing the air outlet temperature of the air conditioner.

[0022] In one embodiment of the present invention, in cooling mode, the first outlet, the second outlet, and the fifth outlet are controlled to be in the open state.

[0023] Compared with existing technologies, the technical advantages achieved by this solution are as follows: In cooling mode, the first, second, and fifth outlets are kept open, while the third and fourth outlets are kept closed. This results in two paths from the compressor to the outdoor heat exchanger, thereby improving the efficiency of the refrigerant flow from the compressor to the outdoor heat exchanger. Simultaneously, there is no waste in the condenser copper tubes during cooling mode, and all tubes can participate in condensation.

[0024] By adopting the technical solution of the present invention, the following technical effects can be achieved:

[0025] (1) Based on the current mainstream heat pump air conditioner, optimize the heating cycle process, add a first reversing valve and a second reversing valve in the middle section between the compressor and the condenser, and achieve different flow directions of refrigerant by controlling the opening and closing of the outlets of the first reversing valve and the second reversing valve, thereby controlling the air conditioner to not enter the defrosting state in the heating mode and providing a stable heating effect.

[0026] (2) There is no waste in the condenser copper tubes in the refrigeration mode, and all tubes can participate in condensation. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the structure of an air conditioner provided in Embodiment 1 of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of a mainstream heat pump air conditioner provided in Embodiment 1 of the present invention.

[0029] Figure 3 This is a flowchart of a control method for an air conditioner provided in Embodiment 2 of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10-Compressor; 20-Four-way reversing valve; 30-Indoor heat exchanger; 40-Throttling device; 50-Outdoor heat exchanger; 60-Liquid receiver; 71-First reversing valve; 72-Second reversing valve. Detailed Implementation

[0032] 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.

[0033] Example 1

[0034] See Figure 1 This invention provides an air conditioner, comprising: a compressor 10, a four-way reversing valve 20, an indoor heat exchanger 30, a throttling device 40, an outdoor heat exchanger 50, and a liquid receiver 60 connected in sequence, and further comprising a first reversing valve 71 and a second reversing valve 72. The compressor 10 has an exhaust port and an intake port; the first reversing valve 71 has a first inlet, a first outlet, and a second outlet, wherein the first inlet is connected to the exhaust port, the first outlet is connected to the four-way reversing valve 20, and the second outlet is connected to the outdoor heat exchanger 50; the second reversing valve 72 has a second inlet, a third outlet, a fourth outlet, and a fifth outlet, wherein the second inlet is connected to the outdoor heat exchanger 50, the third outlet is connected to the four-way reversing valve 20, the fourth outlet is connected to the liquid receiver 60, and the fifth outlet is connected to the throttling device 40; wherein the compressor 10 drives the refrigerant to circulate in the refrigerant circulation loop; by controlling the opening and closing of the outlets of the first reversing valve 71 and the second reversing valve 72, different flow directions of the refrigerant are achieved, thereby preventing the air conditioner from entering the defrosting state in heating mode.

[0035] In one specific embodiment, heat pump air conditioners often experience frequent defrosting in heating mode. During defrosting, the air conditioner operates in cooling mode and cannot provide heat to the indoor space, resulting in a poor user experience. This invention provides an air conditioner that optimizes the heating cycle, enabling the air conditioner to operate without defrosting in heating mode and stably provide heat to the indoor space.

[0036] See Figure 2 Currently, mainstream heat pump air conditioners include a compressor 10, a four-way reversing valve 20, an indoor heat exchanger 30, a throttling device 40, an outdoor heat exchanger 50, and a liquid receiver 60 connected in sequence. The compressor 10 is equipped with an exhaust port and an intake port. The compressor 10 is used to drive the refrigerant to circulate in the refrigerant circulation loop.

[0037] Specifically, based on the current mainstream heat pump air conditioners, the heating cycle process is optimized by adding a first reversing valve 71 and a second reversing valve 72 in the middle section between the compressor 10 and the condenser. The first reversing valve 71 has one inlet and two outlets. The first inlet is connected to the exhaust port of the compressor 10, the first outlet is connected to the four-way reversing valve 20, and the second outlet is connected to the outdoor heat exchanger 50. The second reversing valve 72 has one inlet and two outlets. The second inlet is connected to the outlet pipe of the outdoor heat exchanger 50, the third outlet is connected to the four-way reversing valve 20, the fourth outlet is connected to the liquid receiver 60, and the fifth outlet is connected to the throttling device 40. In heating mode, the high-temperature, high-pressure refrigerant gas discharged from the compressor 10 of a conventional mainstream heat pump air conditioner flows sequentially through the four-way reversing valve 20, indoor heat exchanger 30, throttling device 40, outdoor heat exchanger 50, four-way reversing valve 20, and receiver 60, and finally flows back to the compressor 10. In this invention, different flow directions of the refrigerant can be achieved by controlling the opening and closing of each outlet in the first reversing valve 71 and the second reversing valve 72. By setting the first reversing valve 71 and the second reversing valve 72, the number of paths for the refrigerant from the compressor 10 to the four-way reversing valve 20 is increased, including: ①. First exhaust branch: refrigerant ① The refrigerant flows out of the compressor 10, passes through the first reversing valve 71, and then flows directly to the four-way reversing valve 20; ②. Second exhaust branch: The refrigerant flows out of the compressor 10, passes through the first reversing valve 71, and then flows through the outdoor heat exchanger 50. At the outdoor heat exchanger 50, some copper pipes are heated first, which drives the surrounding pipes to heat up, so that the outdoor heat exchanger 50 is preheated, thereby avoiding frost. After flowing out of the outdoor heat exchanger 50, it flows through the second reversing valve 72 and then flows to the four-way reversing valve 20; After the refrigerant flows from the compressor 10 to the four-way reversing valve 20, it finally enters the indoor heat exchanger 30 to release heat through the four-way reversing valve 20.

[0038] Furthermore, when the air conditioner is in heating mode, when the first outlet is open, the refrigerant flows from the exhaust port sequentially to the first reversing valve 71, the four-way reversing valve 20, and the indoor heat exchanger 30; and / or when the second outlet is open, the refrigerant flows from the exhaust port sequentially to the first reversing valve 71 and the outdoor heat exchanger 50 to preheat the outdoor heat exchanger 50; and / or when the third outlet is open, the refrigerant flowing through the second reversing valve 72 flows through the third outlet to the four-way reversing valve 20; and / or when the fourth outlet is open, the refrigerant flowing through the second reversing valve 72 flows through the fourth outlet to the liquid receiver 60 and flows back to the compressor 10 to raise its temperature; and / or when the fifth outlet is open, the refrigerant flowing through the second reversing valve 72 flows through the fifth outlet to the throttling device 40.

[0039] Specifically, the first reversing valve 71 has one inlet and two outlets. The first inlet connects to the exhaust port of the compressor 10, the first outlet connects to the four-way reversing valve 20, and the second outlet connects to the outdoor heat exchanger 50. The second reversing valve 72 has one inlet and two outlets. The second inlet connects to the outlet pipe of the outdoor heat exchanger 50, the third outlet connects to the four-way reversing valve 20, the fourth outlet connects to the liquid receiver 60, and the fifth outlet connects to the throttling device 40. When the air conditioner is in heating mode, the refrigerant circulation direction is compressor 10 - indoor heat exchanger 30 - outdoor heat exchanger 50 - compressor 10. When the first outlet is open, the path of the refrigerant from compressor 10 to four-way reversing valve 20 includes the first reversing valve 71. The refrigerant flows from the exhaust port sequentially to the first reversing valve 71, the four-way reversing valve 20, and finally to the indoor heat exchanger 30. When the second outlet is open, the refrigerant flows from the exhaust port preferentially to the first reversing valve 71 and the outdoor heat exchanger 50, thus affecting the outdoor heat exchanger 50. Preheating the heat exchanger 50 effectively prevents frost formation on the outdoor heat exchanger 50 at low temperatures. When the third outlet is open, the refrigerant flowing through the second reversing valve 72 flows through the third outlet to the four-way reversing valve 20. When the fourth outlet is open, the refrigerant flowing through the second reversing valve 72 flows through the fourth outlet to the liquid receiver 60 and then flows back to the compressor 10 to raise its temperature, which can improve the heat exchange capacity and heat exchange efficiency. When the fifth outlet is open, the refrigerant flowing through the second reversing valve 72 flows through the fifth outlet to the throttling device 40.

[0040] Furthermore, in heating mode, when the first and fifth outlets are open and the second, third, and fourth outlets are closed, the refrigerant discharged from the exhaust port flows sequentially through the first reversing valve 71 and the four-way reversing valve 20, and enters the indoor heat exchanger 30 to release heat.

[0041] Specifically, when the first and fifth outlets are open and the second, third, and fourth outlets are closed, the heat discharged from the compressor 10 directly enters the inner side (i.e., the indoor heat exchanger 30) through the four-way reversing valve 20 to release heat, and the air conditioner can heat normally without frost.

[0042] Furthermore, in heating mode, when the second and third outlets are open and the first, fourth, and fifth outlets are closed, the refrigerant discharged from the exhaust port flows sequentially through the first reversing valve 71, the outdoor heat exchanger 50, the second reversing valve 72, and the four-way reversing valve 20 to preheat the outdoor heat exchanger 50 and then enter the indoor heat exchanger 30 to release heat.

[0043] Specifically, when the second and third outlets are open and the first, fourth, and fifth outlets are closed, the exhaust heat from the compressor 10 first heats part of the copper pipes of the condenser (i.e., the outdoor heat exchanger 50), causing the surrounding pipes to heat up. Then, the heat is released into the inner side (i.e., the indoor heat exchanger 30) through the four-way reversing valve 20. The condenser (i.e., the outdoor heat exchanger 50) is preheated and does not frost up when heating.

[0044] Furthermore, in heating mode, when the second, third, and fourth outlets are open and the first and fifth outlets are closed, the refrigerant discharged from the exhaust port flows sequentially through the first reversing valve 71, the outdoor heat exchanger 50, and the second reversing valve 72, and a portion of the refrigerant is diverted to the liquid receiver 60 at the second reversing valve 72.

[0045] Specifically, when the second, third, and fourth outlets are open and the first and fifth outlets are closed, the exhaust heat from the compressor 10 first heats part of the copper pipes of the condenser (i.e., the outdoor heat exchanger 50), causing the surrounding pipes to heat up. Then, it enters the inner side (i.e., the indoor heat exchanger 30) through the four-way reversing valve 20 to release heat. The condenser (i.e., the outdoor heat exchanger 50) is preheated and does not frost while heating. At the same time, part of the refrigerant circulates back into the compressor 10 to reheat, increasing the heat exchange capacity of the indoor side (i.e., the indoor heat exchanger 30) and raising the indoor air outlet temperature.

[0046]

Example 2

[0047] See Figure 3 The present invention also provides a control method for an air conditioner, used in an air conditioner, the control method comprising:

[0048] Step S100: In heating mode, obtain the external coil temperature and the inner ring temperature of the air conditioner;

[0049] In one specific embodiment, the temperature of the air conditioner's outer ring can indicate the likelihood of the air conditioner entering defrost mode in heating mode: the lower the outer ring temperature in heating mode, the more likely the air conditioner is to enter defrost mode; the temperature of the air conditioner's inner ring can indicate the temperature of the indoor space, thereby determining the heating effect of the air conditioner: within a certain period of time, the lower the inner ring temperature, the lower the temperature of the indoor space, and the worse the heating effect of the air conditioner.

[0050] Preferably, the outer coil temperature of the air conditioner is collected in real time by a condenser outer coil temperature sensor, and the inner coil temperature of the air conditioner is collected in real time by an inner coil temperature sensor.

[0051] Further, in step S200: based on the outer ring temperature and the inner ring temperature, control the opening and closing of the outlets of the first reversing valve and the second reversing valve, thereby controlling the flow direction of the refrigerant in the refrigerant circulation loop.

[0052] Step S210: Based on the outer plate temperature and the preset temperature of the first outer plate, control the opening and closing of the outlets of the first reversing valve and the second reversing valve;

[0053] When the outer plate temperature exceeds the preset temperature of the first outer plate, control the first outlet and the fifth outlet to be in the open state; and / or

[0054] When the outer plate temperature is less than or equal to the first outer plate preset temperature, the opening and closing of the outlets of the first reversing valve and the second reversing valve are controlled according to the difference between the outer plate temperature and the second outer plate preset temperature.

[0055] The preset temperature of the first outer plate is greater than that of the preset temperature of the second outer plate.

[0056] Specifically, when the air conditioner is not turned on or has just been turned on, the first and second outlets of the first reversing valve and the third, fourth, and fifth outlets of the second reversing valve are closed. Based on subsequent detection of the external and internal ambient temperatures, the opening and closing of the outlets of the first and second reversing valves are controlled. First, the external ambient temperature and the preset external ambient temperature are determined: if T... 外 >T 外预1 This indicates that the outdoor temperature is relatively high, making it less likely that the air conditioner will enter defrost mode. The first and fifth outlets are open, while the second, third, and fourth outlets are closed. The refrigerant discharged from the compressor flows sequentially through the first reversing valve and the four-way reversing valve, entering the indoor heat exchanger to release heat. In other words, the compressor's exhaust heat directly enters the indoor heat exchanger through the four-way reversing valve for heat release, allowing the air conditioner to heat without frosting. If T... 外 ≤T 外预1This indicates that the outdoor temperature is relatively low at this time, but the air conditioner may enter defrost mode. The compressor's exhaust heat directly enters the indoor heat exchanger through the four-way reversing valve, potentially causing frost to form on the outdoor heat exchanger. (T) 外 ≤T 外预1 In the case of T, by judging and according to 外 and T 外预2 The size of T controls the opening and closing of the outlets of the first and second directional valves. 外 Indicates the outer plate temperature, T 外预1 Indicates the preset temperature of the first outer plate, T 外预2 Indicates the preset temperature of the second outer plate; T 外预1 >T 外预2 .

[0057] For example, the air conditioner is factory-set with two preset outdoor unit temperatures. Users can also manually set these temperatures according to their preferences. Preferably, T... 外预1 The preferred value is -2℃, T 外预2 The preferred value is -8℃.

[0058] In heating mode, the control method prioritizes determining whether the outer plate temperature is greater than the first preset outer plate temperature before determining whether to compare the outer plate temperature with the second preset outer plate temperature. This design saves steps, reduces unnecessary judgment and detection steps, and makes the control process more efficient.

[0059] Furthermore, when the outer plate temperature is less than or equal to the first preset outer plate temperature, the opening and closing of the outlets of the first and second directional control valves are controlled according to the magnitude of the outer plate temperature and the second preset outer plate temperature, including:

[0060] When the outer plate temperature is greater than or equal to the preset temperature of the second outer plate, control the second and third outlets to be in the open state; and / or

[0061] When the outer ring temperature is lower than the second outer ring preset temperature, the second and third outlets are controlled to be open, and the opening and closing of the fourth outlet is controlled according to the inner ring temperature and the inner ring preset temperature.

[0062] Specifically, when the outer plate temperature is less than or equal to the first preset outer plate temperature, the system further determines the relative value of the outer plate temperature and the second preset outer plate temperature. If the outer plate temperature is less than or equal to the first preset outer plate temperature, it indicates that the outer plate temperature is relatively low, and the air conditioner may enter defrost mode. Therefore, by controlling the second and third outlets to be open, while the first, fourth, and fifth outlets are closed, the refrigerant discharged from the compressor's exhaust port preferentially flows through the first reversing valve to the outdoor heat exchanger. This preheats the pipes surrounding the outdoor heat exchanger, effectively preventing frost formation on the outdoor heat exchanger under low-temperature conditions. When the outer plate temperature is less than the second preset outer plate temperature, the opening and closing of the fourth outlet needs to be controlled based on the inner ring temperature and the inner ring preset temperature. The fourth outlet is connected to the receiver.

[0063] Furthermore, when the outer ring temperature is lower than the second outer ring preset temperature, the opening and closing of the fourth outlet is controlled according to the inner ring temperature and the inner ring preset temperature, including: when the inner ring temperature is lower than the inner ring preset temperature, the fourth outlet is controlled to be in the open state.

[0064] Specifically, if the outer ring temperature is lower than the second outer ring preset temperature, further determine the magnitude of the inner ring temperature and the inner ring preset temperature: If T 内 >T 内预 Keep the second and third exits open and the first, fourth, and fifth exits closed; if T 内 <T 内预 The fact that the fourth outlet is open indicates that the indoor temperature is low, requiring an increase in the air conditioner's heating efficiency. By opening the fourth outlet, some refrigerant circulates back into the compressor through the fourth opening to reheat, increasing the heat exchange capacity of the indoor heat exchanger and thus raising the air conditioner's outlet temperature. Among these, T... 内 Indicates the inner ring temperature, T 内预 This indicates the preset temperature of the inner ring.

[0065] For example, air conditioners are set with a preset inner loop temperature at the factory, but users can also manually adjust this preset temperature according to their preferences. Preferably, T... 内预 The preferred value is 16℃.

[0066] Furthermore, the control method also includes: in cooling mode, controlling the first outlet, the second outlet, and the fifth outlet to be in the open state.

[0067] Specifically, in cooling mode, the first, second, and fifth outlets are kept open, while the third and fourth outlets are kept closed. The refrigerant discharged from the compressor passes through the outdoor heat exchanger and the throttling device to reach the indoor heat exchanger. From the indoor heat exchanger, it flows to the four-way reversing valve and the receiver, eventually returning to the compressor. The path from the compressor to the outdoor heat exchanger includes two paths: ①. Exhaust port - first inlet - first outlet - four-way reversing valve - outdoor heat exchanger; ②. Exhaust port - first inlet - second outlet - outdoor heat exchanger, thus improving the efficiency of the refrigerant discharged from the compressor flowing to the outdoor heat exchanger.

[0068] 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: A compressor (10), a four-way reversing valve (20), an indoor heat exchanger (30), a throttling device (40), an outdoor heat exchanger (50), and a liquid receiver (60) are connected in sequence. The compressor (10) is provided with an exhaust port and an intake port. The first reversing valve (71) has a first inlet, a first outlet and a second outlet, wherein the first inlet is connected to the exhaust port, the first outlet is connected to the four-way reversing valve (20) and the second outlet is connected to the outdoor heat exchanger (50). The second reversing valve (72) has a second inlet, a third outlet, a fourth outlet and a fifth outlet, wherein the second inlet is connected to the outdoor heat exchanger (50), the third outlet is connected to the four-way reversing valve (20), the fourth outlet is connected to the liquid reservoir (60) and the fifth outlet is connected to the throttling device (40). The compressor (10) is used to drive the refrigerant to circulate in the refrigerant circulation loop; by controlling the opening and closing of the outlets of the first reversing valve (71) and the second reversing valve (72), the different flow directions of the refrigerant are realized, thereby controlling the air conditioner not to enter the defrosting state in the heating mode; When the air conditioner is in heating mode When the first outlet is open, the refrigerant flows from the exhaust port sequentially to the first reversing valve (71), the four-way reversing valve (20), and the indoor heat exchanger (30); and / or When the second outlet is open, the refrigerant flows from the exhaust port sequentially to the first reversing valve (71) and the outdoor heat exchanger (50) to preheat the outdoor heat exchanger (50); and / or When the third outlet is open, the refrigerant flowing through the second reversing valve (72) flows through the third outlet to the four-way reversing valve (20); and / or When the fourth outlet is open, the refrigerant flowing through the second reversing valve (72) flows through the fourth outlet to the liquid receiver (60) and then back to the compressor (10) to heat up; and / or When the fifth outlet is open, the refrigerant flowing through the second reversing valve (72) flows to the throttling device (40) through the fifth outlet.

2. The air conditioner according to claim 1, characterized in that, In heating mode, when the first outlet and the fifth outlet are open, and the second outlet, the third outlet and the fourth outlet are closed, the refrigerant discharged from the exhaust port flows sequentially through the first reversing valve (71) and the four-way reversing valve (20) and enters the indoor heat exchanger (30) to release heat.

3. The air conditioner according to claim 1, characterized in that, In heating mode, when the second outlet and the third outlet are open, and the first outlet, the fourth outlet and the fifth outlet are closed, the refrigerant discharged from the exhaust port flows sequentially through the first reversing valve (71), the outdoor heat exchanger (50), the second reversing valve (72) and the four-way reversing valve (20) to preheat the outdoor heat exchanger (50) and then enters the indoor heat exchanger (30) to release heat.

4. The air conditioner according to claim 1, characterized in that, In heating mode, when the second outlet, the third outlet and the fourth outlet are open and the first outlet and the fifth outlet are closed, the refrigerant discharged from the exhaust port flows sequentially through the first reversing valve (71), the outdoor heat exchanger (50) and the second reversing valve (72), and a portion of the refrigerant is diverted to the liquid receiver (60) at the second reversing valve (72).

5. A control method for an air conditioner, used in the air conditioner according to any one of claims 1-4, characterized in that, The control method includes: In heating mode, the external coil temperature and the inner ring temperature of the air conditioner are obtained; Based on the outer ring temperature and the inner ring temperature, the opening and closing of the outlets of the first reversing valve and the second reversing valve are controlled, thereby controlling the flow direction of the refrigerant in the refrigerant circulation loop.

6. The control method according to claim 5, characterized in that, The step of controlling the opening and closing of the outlets of the first reversing valve and the second reversing valve based on the outer ring temperature and the inner ring temperature, thereby controlling the flow direction of the refrigerant in the refrigerant circulation loop, includes: The opening and closing of the outlets of the first reversing valve and the second reversing valve are controlled according to the outer plate temperature and the preset temperature of the first outer plate. When the temperature of the outer disk is greater than the preset temperature of the first outer disk, control the first outlet and the fifth outlet to be in the open state; and / or When the outer disk temperature is less than or equal to the first outer disk preset temperature, the opening and closing of the outlets of the first reversing valve and the second reversing valve are controlled according to the magnitude of the outer disk temperature and the second outer disk preset temperature. The preset temperature of the first outer disk is greater than the preset temperature of the second outer disk.

7. The control method according to claim 6, characterized in that, When the outer disk temperature is less than or equal to the first preset outer disk temperature, controlling the opening and closing of the outlets of the first reversing valve and the second reversing valve according to the magnitude of the outer disk temperature and the second preset outer disk temperature includes: When the outer disk temperature is greater than or equal to the preset temperature of the second outer disk, control the second outlet and the third outlet to be in the open state; and / or When the outer disk temperature is lower than the second outer disk preset temperature, the second outlet and the third outlet are controlled to be in the open state, and the opening and closing of the fourth outlet is controlled according to the inner ring temperature and the inner ring preset temperature.

8. The control method according to claim 7, characterized in that, When the outer disk temperature is lower than the second outer disk preset temperature, controlling the opening and closing of the fourth outlet according to the inner ring temperature and the inner ring preset temperature includes: When the inner ring temperature is lower than the inner ring preset temperature, the fourth outlet is controlled to be in the open state.

9. The control method according to claim 5, characterized in that, The control method further includes: In cooling mode, the first outlet, the second outlet, and the fifth outlet are kept in the open state.

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