Air conditioning system

Abstract

The utility model discloses an air conditioning system, which relates to the technical field of air conditioners and comprises an outdoor heat exchanger, a compressor and an indoor heat exchanger. One end of the first branch and one end of the second branch both communicate with the first end of the indoor heat exchanger through the first pipeline; the outdoor heat exchanger comprises a first outdoor unit coil pipe and a second outdoor unit coil pipe, and the first end of the first outdoor unit coil pipe and the first end of the second outdoor unit coil pipe communicate with the other end of the first branch and the other end of the second branch correspondingly so that refrigerants flowing out of the indoor heat exchanger can flow into the first outdoor unit coil pipe and the second outdoor unit coil pipe. And the first valve is arranged on the first branch or the second branch, and a refrigerant flowing out of the indoor heat exchanger flows into the first outdoor unit coil or the second outdoor unit coil, so that the heat exchange amount of the refrigerant and the outdoor environment is reduced. The air conditioning system effectively prevents lubrication condition deterioration caused by overheating of the compressor, and ensures the service life of the compressor.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an air conditioning system. Background Art

[0002] As users' requirements for indoor air quality continue to increase, the sterilization function of air conditioners has become a key technology for air conditioners. When the air conditioner is running in high-temperature sterilization mode, the operating parameters of the air conditioner are usually adjusted based on the heating mode to enable the air conditioner to reach the sterilization temperature. In the prior art, when the temperature of the outdoor environment is high, the refrigerant absorbs heat in the outdoor heat exchanger and easily becomes an overheated gaseous refrigerant, causing the compressor's suction superheat and exhaust temperature to increase, which in turn causes the temperature of the compressor itself to increase. In severe cases, it can cause the compressor to malfunction and shut down. When the temperature of the compressor itself is too high, the lubricating oil in the compressor will carbonize, causing the lubrication conditions of the compressor chamber to quickly deteriorate, thereby damaging the compressor and reducing the compressor's service life. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an air-conditioning system that can reduce the risk of damage to the compressor when the air-conditioning system is sterilized at high temperature in a high temperature environment.

[0004] According to an embodiment of the present invention, the air-conditioning system includes: an outdoor heat exchanger, a compressor and an indoor heat exchanger, a circuit for the flow of refrigerant is formed between the outdoor heat exchanger, the compressor and the indoor heat exchanger; a first pipe, a first branch and a second branch, one end of the first branch and the second branch are both connected to the first end of the indoor heat exchanger through the first pipe; the outdoor heat exchanger includes a first outdoor unit coil and a second outdoor unit coil arranged alternately, the first ends of the first outdoor unit coil and the second outdoor unit coil are respectively connected to the other ends of the first branch and the second branch, so that the refrigerant flowing out of the indoor heat exchanger can flow into the first outdoor unit coil and the second outdoor unit coil; a first valve, the first valve is arranged on the first branch, the first valve can close the first branch, so that the refrigerant flowing out of the indoor heat exchanger only flows into the second outdoor unit coil, so as to reduce the heat exchange between the refrigerant and the outdoor environment.

[0005] It has at least the following beneficial effects:

[0006] When the air-conditioning system is in high-temperature sterilization mode, the refrigerant flowing out of the compressor exhaust port first flows through the indoor heat exchanger, then flows through the first and second outdoor unit coils in the outdoor heat exchanger, and finally flows into the air inlet port of the compressor, and so on, to complete the sterilization of the air-conditioning system. When the temperature of the outdoor environment is high, the first valve set on the first branch will be closed, so that the refrigerant flowing out of the indoor heat exchanger will only flow into the second outdoor unit coil, reducing the heat exchange between the refrigerant in the second outdoor unit coil and the outdoor environment, that is, reducing the heat absorbed by the refrigerant from the outdoor environment, avoiding the temperature of the refrigerant flowing into the compressor intake port to be higher, and also avoiding the temperature of the refrigerant flowing out of the compressor exhaust port to be higher, effectively preventing the compressor from overheating and deteriorating the lubrication conditions, which is conducive to ensuring the service life of the compressor and reducing the risk of damage to the compressor when the air-conditioning system is sterilized under high temperature environment.

[0007] According to an embodiment of the present invention, the air-conditioning system further includes a second valve, which is arranged on the second branch. The second valve is used to open or close the second branch. The first valve is used to open or close the first branch so that the refrigerant flowing out of the indoor heat exchanger can flow into the first outdoor unit coil and the second outdoor unit coil at the same time, or the refrigerant flowing out of the indoor heat exchanger can flow into the first outdoor unit coil or the second outdoor unit coil.

[0008] According to the air conditioning system of the embodiment of the present invention, the heat exchange areas of the first outdoor unit coil and the second outdoor unit coil are different.

[0009] According to the air-conditioning system of an embodiment of the present invention, a first throttling element and a second throttling element, the first throttling element is arranged on the first branch, the first throttling element is arranged between the first outdoor unit coil and the first valve, the second throttling element is arranged on the second branch, and the second throttling element is arranged between the second outdoor unit coil and the second valve.

[0010] According to an embodiment of the present invention, the air-conditioning system further includes a first filter and a second filter. The first filter is arranged on the first branch, and the first filter is arranged between the first outdoor unit coil and the first valve. The second filter is arranged on the second branch, and the second filter is arranged between the second outdoor unit coil and the second valve.

[0011] According to an embodiment of the present invention, the air-conditioning system further includes a four-way valve, a third branch, a fourth branch and a third valve, the indoor heat exchanger includes a first indoor unit coil and a second indoor unit coil arranged alternately, the first ends of the first indoor unit coil and the second indoor unit coil are both connected to one end of the first pipeline, the other end of the first pipeline is connected to one end of the first branch and the second branch, one end of the third branch and the fourth branch are respectively connected to the second ends of the first indoor unit coil and the second indoor unit coil, the other ends of the third branch and the fourth branch are both able to be connected to the exhaust end of the compressor through the four-way valve, so that the refrigerant flowing out of the compressor can flow into the first indoor unit coil and the second indoor unit coil, the third valve is provided on the third branch, and the third valve can close the third branch so that the refrigerant flowing out of the compressor only flows into the second indoor unit coil, so as to reduce the heat exchange between the refrigerant and the indoor environment.

[0012] According to an embodiment of the present invention, the air-conditioning system further includes a fourth valve, which is arranged on the fourth branch. The fourth valve is used to open or close the fourth branch, and the third valve is used to open or close the third branch, so that the refrigerant flowing out of the compressor exhaust end can flow into the first indoor unit coil and the second indoor unit coil at the same time, or the refrigerant flowing out of the compressor exhaust end can flow into the first indoor unit coil or the second indoor unit coil.

[0013] According to the air conditioning system of the embodiment of the present invention, the heat exchange areas of the first indoor unit coil and the second indoor unit coil are different.

[0014] According to an embodiment of the present invention, the air-conditioning system further includes a second pipeline, a third pipeline, a fourth pipeline, and a fifth pipeline. The four-way valve has a C interface, an S interface, an E interface, and a D interface. The exhaust end of the compressor is connected to the D interface through the fifth pipeline, and the intake end of the compressor is connected to the S interface through the fourth pipeline. The other ends of the third branch and the fourth branch are both connected to the E interface through the third pipeline. The second ends of the first outdoor unit coil and the second outdoor unit coil are both connected to the C interface through the second pipeline. The D interface can be connected to the E interface, and the C interface can be connected to the S interface, so that the refrigerant flowing out of the compressor exhaust end first flows through the first indoor unit coil and the second indoor unit coil, and then flows through the first outdoor unit coil and the second outdoor unit coil. The D interface can be connected to the C interface, and the E interface can be connected to the S interface, so that the refrigerant flowing out of the compressor exhaust end first flows through the first outdoor unit coil and the second outdoor unit coil, and then flows through the first indoor unit coil and the second indoor unit coil.

[0015] According to an embodiment of the present invention, the air-conditioning system further includes a fifth branch and a fifth valve, one end of the fifth branch is connected to the fifth pipe, and the other end of the fifth branch is connected to the first branch or the second branch. The fifth valve can open the fifth branch so that part of the refrigerant flowing out of the compressor exhaust end can flow into the first outdoor unit coil or the second outdoor unit coil, so as to increase the temperature of the first outdoor unit coil and the second outdoor unit coil and melt the frost layer on the first outdoor unit coil and the second outdoor unit coil.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 This is a schematic diagram of an air conditioning system according to an embodiment of the present utility model;

[0019] Figure 2 Schematic diagram of a first outdoor unit coil and a second outdoor unit coil in an air-conditioning system according to an embodiment of the present utility model;

[0020] Figure 3 This is a partial schematic diagram of an outdoor heat exchanger in an air-conditioning system according to an embodiment of the present utility model;

[0021] Figure 4 This is a partial schematic diagram of an indoor heat exchanger in an air-conditioning system according to an embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the connection mode of the four-way valve in the air-conditioning system of the embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the refrigerant flow of the air-conditioning system in the cooling mode, heating mode and high-temperature sterilization mode according to an embodiment of the utility model;

[0024] Figure 7 This is a schematic diagram of the refrigerant flow when the air-conditioning system according to the embodiment of the utility model is in high-temperature sterilization mode and the outdoor ambient temperature is high;

[0025] Figure 8 This is a schematic diagram of the refrigerant flow when the air-conditioning system according to the embodiment of the present invention is in high-temperature sterilization mode and the outdoor ambient temperature is low;

[0026] Figure 9 This is a schematic diagram of the refrigerant flow after the air-conditioning system according to the embodiment of the utility model is in high-temperature sterilization mode and the outdoor heat exchanger has been frosted;

[0027] Reference numerals:

[0028] Indoor heat exchanger 100; first indoor unit coil 110; second indoor unit coil 120; indoor fan 130;

[0029] Outdoor heat exchanger 200; first outdoor unit coil 210; second outdoor unit coil 220; outdoor fan 230;

[0030] Compressor 300; first pipeline 310; second pipeline 320; third pipeline 330; fourth pipeline 340; fifth pipeline 350; four-way valve 360;

[0031] First branch 400; first valve 410; first throttle element 420; first filter 430;

[0032] Second branch 500; second valve 510; second throttle element 520; second filter 530;

[0033] The third branch 600; the third valve 610;

[0034] Fourth branch 700; fourth valve 710;

[0035] Fifth branch 800 ; fifth valve 810 . DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0038] In the description of this utility model, "a plurality" means more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] It should be explained that the air conditioner's high-temperature sterilization mode is a special case of the heating mode. When the air conditioner is in heating mode, the refrigerant flowing out of the compressor 300 will first flow into the indoor heat exchanger 100, then into the outdoor heat exchanger 200, and finally flow back into the compressor 300. When the air conditioner is in high-temperature sterilization mode, the air conditioner is essentially still in heating mode. At this time, the indoor fan 130 stops rotating, and the air conditioner will further increase its internal temperature to a level that can kill bacteria and microorganisms. When the air conditioner is in cooling mode, the refrigerant flowing out of the compressor 300 will first flow into the outdoor heat exchanger 200, then into the indoor heat exchanger 100, and finally flow back into the compressor 300. The principles and refrigerant flow directions of the air conditioner's cooling mode, heating mode, and high-temperature sterilization mode are common air conditioner technologies and will not be further elaborated here.

[0041] It should be noted that the suction superheat of the compressor 300 refers to the difference between the actual temperature of the gaseous refrigerant drawn into the compressor 300 and the refrigerant's evaporation temperature. The discharge temperature of the compressor 300 refers to the temperature of the discharged gaseous refrigerant. When the air conditioner is in high-temperature sterilization mode and the outdoor ambient temperature is high, the refrigerant flowing into the outdoor heat exchanger 200 absorbs more heat from the outdoor environment, causing the temperature of the refrigerant flowing into the intake end of the compressor 300 to be higher, and also causing the temperature of the refrigerant flowing out of the discharge end of the compressor 300 to be higher. In other words, the suction superheat and discharge temperature of the compressor 300 increase, causing the temperature of the compressor 300 itself to rise rapidly. When the air conditioner operates in high-temperature sterilization mode for a period of time under high outdoor ambient temperature, the compressor 300 will overheat. At this time, the lubricating oil in the compressor 300 is easily carbonized, which quickly deteriorates the lubrication conditions of the compressor 300, thereby damaging the compressor 300 and reducing its service life.

[0042] It should be explained that, in the embodiment of the present invention, the heat exchange area refers to the surface area of ​​the coil.

[0043] refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 7 According to an embodiment of the present invention, the air conditioning system includes an outdoor heat exchanger 200 , a compressor 300 , an indoor heat exchanger 100 , a first pipeline 310 , a first branch 400 , a second branch 500 and a first valve 410 .

[0044] A refrigerant circuit is formed between the outdoor heat exchanger 200, the compressor 300, and the indoor heat exchanger 100. The compressor 300 forces the refrigerant to flow within the circuit, so that the refrigerant flowing out of the compressor 300's exhaust port first flows through the outdoor heat exchanger 200 and then through the indoor heat exchanger 100. One end of each of the first branch 400 and the second branch 500 communicates with the first end of the indoor heat exchanger 100 via the first pipe 310. The outdoor heat exchanger 200 includes a first outdoor unit coil 210 and a second outdoor unit coil 220, which are arranged alternately. The first ends of the first and second outdoor unit coils 210 and 220 communicate with the other ends of the first and second branches 400 and 500, respectively, so that the refrigerant flowing out of the indoor heat exchanger 100 can flow into the first and second outdoor unit coils 210 and 220. The first valve 410 is provided on the first branch 400. The first valve 410 can close the first branch 400 so that the refrigerant flowing out of the indoor heat exchanger 100 only flows into the second outdoor unit coil 220, thereby reducing the heat exchange between the refrigerant and the outdoor environment.

[0045] It is understandable that when the air-conditioning system is in high-temperature sterilization mode, the refrigerant flowing out of the exhaust end of the compressor 300 first flows through the indoor heat exchanger 100, then flows through the first outdoor coil 210 and the second outdoor coil 220 in the outdoor heat exchanger 200, and finally flows into the air inlet end of the compressor 300, and so on. The cycle completes the sterilization of the air-conditioning system. When the temperature of the outdoor environment is high, the first valve 410 set on the first branch 400 will be closed, so that the refrigerant flowing out of the indoor heat exchanger 100 only flows into the second outdoor coil 220, reducing the heat exchange between the refrigerant in the outdoor heat exchanger 200 and the outdoor environment, that is, reducing the heat absorbed by the refrigerant from the outdoor environment, avoiding the temperature of the refrigerant flowing into the air inlet end of the compressor 300 to be higher, and also avoiding the temperature of the refrigerant flowing out of the exhaust end of the compressor 300 to be higher, effectively preventing the compressor 300 from overheating and causing the lubrication conditions to deteriorate, which is beneficial to ensuring the service life of the compressor 300 and reducing the risk of damage to the compressor when the air-conditioning system is sterilized under high temperature in a high-temperature environment.

[0046] In the embodiment of the present invention, a first high temperature threshold is preset in the air conditioning system. When the outdoor ambient temperature is greater than or equal to the first high temperature threshold, it means that the outdoor ambient temperature is too high. Figure 2The heat exchange area of ​​the first outdoor unit coil 210 is defined as A1, and the heat exchange area of ​​the second outdoor unit coil 220 is defined as B1. The first and second outdoor unit coils 210, 220 are arranged in an interlaced manner. When the air conditioning system is in conventional cooling mode, heating mode, and high-temperature sterilization mode, the refrigerant will flow through the first and second outdoor unit coils 210, 220 simultaneously. That is, when the outdoor ambient temperature of the air conditioning system is less than the first high-temperature threshold, the refrigerant will flow through the first and second outdoor unit coils 210, 220 simultaneously. At this time, the heat exchange area of ​​the outdoor heat exchanger 200 is A1 + B1. When the outdoor ambient temperature is greater than or equal to the first high temperature threshold, the first valve 410 will close the first branch 400, so that the refrigerant flowing out of the indoor heat exchanger 100 only flows into the second outdoor unit coil 220. At this time, the heat exchange area of ​​the outdoor heat exchanger 200 is B1, which reduces the heat exchange area of ​​the outdoor heat exchanger 200 and reduces the heat exchange rate between the refrigerant in the outdoor heat exchanger 200 and the outdoor environment, that is, reduces the heat absorbed by the refrigerant from the outdoor environment, thereby avoiding overheating of the compressor 300.

[0047] As one embodiment of the present invention, the first outdoor unit coil 210 and the second outdoor unit coil 220 have the same heat exchange area. It is understood that when the first outdoor unit coil 210 and the second outdoor unit coil 220 have the same heat exchange area, the first valve 410 can be located on either the first branch 400 or the second branch 500. The first valve 410 only needs to close the first branch 400 or the second branch 500 to reduce the heat exchange area of ​​the outdoor heat exchanger 200.

[0048] refer to Figure 1 、 Figure 3 and Figure 7 The air conditioning system further includes a second valve 510, which is disposed on the second branch 500. The first valve 410 is disposed on the first branch 400. The second valve 510 is used to open or close the second branch 500, and the first valve 410 is used to open or close the first branch 400, so that the refrigerant flowing out of the indoor heat exchanger 100 can flow into both the first outdoor unit coil 210 and the second outdoor unit coil 220, or so that the refrigerant flowing out of the indoor heat exchanger 100 can flow into either the first outdoor unit coil 210 or the second outdoor unit coil 220. It is understood that when the outdoor ambient temperature is high, either the first valve 410 or the second valve 510 can be activated and closed, while the other remains open, to reduce the heat exchange between the refrigerant and the outdoor environment. It should be noted that in this embodiment of the present invention, the first valve 410 and the second valve 510 cannot be closed simultaneously to ensure that the air conditioning system can operate normally in the high-temperature sterilization mode.

[0049] In another embodiment of the present invention, the first outdoor unit coil 210 and the second outdoor unit coil 220 have different heat exchange areas. A second high temperature threshold is preset within the air conditioning system, and the second high temperature threshold is greater than the first high temperature threshold. Here, the heat exchange area of ​​the second outdoor unit coil 220 is larger than the heat exchange area of ​​the first outdoor unit coil 210, as an example.

[0050] After the high-temperature sterilization mode of the air-conditioning system is running, when the outdoor ambient temperature is lower than the first high-temperature threshold, the first valve 410 and the second valve 510 remain open at the same time, so that the refrigerant flowing out of the indoor heat exchanger 100 can flow into the first outdoor coil 210 and the second outdoor coil 220 at the same time, which is more conducive to protecting the compressor 300.

[0051] When the outdoor ambient temperature is greater than or equal to the first high temperature threshold and less than the second high temperature threshold, the first valve 410 closes the first branch 400, and the second valve 510 remains open, so that the refrigerant flowing out of the indoor heat exchanger 100 flows only into the second outdoor unit coil 220. It can be understood that the heat exchange area of ​​the second outdoor unit coil 220 is larger than that of the first outdoor unit coil 210. When the outdoor ambient temperature is greater than or equal to the first high temperature threshold and less than the second high temperature threshold, it can be understood that the outdoor ambient temperature is not too high. In other words, there is no need to reduce the heat exchange area of ​​the outdoor heat exchanger 200 significantly at this time. It is sufficient to simply close the first outdoor unit coil 210, which has a smaller heat exchange area.

[0052] When the outdoor ambient temperature is greater than or equal to the second high temperature threshold, the second valve 510 closes the second branch 500, while the first valve 410 remains open, allowing the refrigerant flowing out of the indoor heat exchanger 100 to flow only into the first outdoor unit coil 210. It is understood that when the outdoor ambient temperature is greater than or equal to the second high temperature threshold, it can be understood that the outdoor ambient temperature is too high, meaning that the heat exchange area of ​​the outdoor heat exchanger 200 needs to be reduced. This can be achieved by simply closing the second outdoor unit coil 220, which has a larger heat exchange area. In an embodiment of the present invention, the air conditioning system further includes a first temperature detection mechanism that detects the outdoor ambient temperature and compares it with the first high temperature threshold and the second high temperature threshold. This allows the refrigerant flowing out of the indoor heat exchanger 100 to flow into both the first outdoor unit coil 210 and the second outdoor unit coil 220, or to flow into either the first outdoor unit coil 210 or the second outdoor unit coil 220. This allows the air conditioning system to change the heat exchange area of ​​the outdoor heat exchanger 200 according to different high temperature thresholds, thereby increasing the flexibility of the air conditioning system.

[0053] refer to Figure 3The air conditioning system further includes a first throttle element 420 and a second throttle element 520. The first throttle element 420 is disposed on the first branch 400, and is disposed between the first outdoor unit coil 210 and the first valve 410. The second throttle element 520 is disposed on the second branch 500, and is disposed between the second outdoor unit coil 220 and the second valve 510. Specifically, the air conditioning system further includes a first filter 430 and a second filter 530. The first filter 430 is disposed on the first branch 400, and is disposed between the first outdoor unit coil 210 and the first valve 410. The second filter 530 is disposed on the second branch 50.

[0054] It will be appreciated that the first filter 430 is used to protect the first outdoor unit coil 210 and the first throttling element 420, preventing foreign particles in the refrigerant from damaging the first outdoor unit coil 210 and the first throttling element 420. The second filter 530 is used to protect the second outdoor unit coil 220 and the second throttling element 520. The first filter 430, the first throttling element 420, the second filter 530, and the second throttling element 520 are common components in the air conditioner field and will not be further described here. Specifically, the first throttling element 420 and the second throttling element 520 can each be a thermal expansion valve, an electronic expansion valve, or a capillary tube.

[0055] It needs to be explained that in the prior art, when the temperatures of the outdoor environment and the indoor environment are low and the air conditioner is in high-temperature sterilization mode, the refrigerant flowing out from the exhaust end of the compressor 300 will lose a large amount of heat in the indoor heat exchanger 100, resulting in a lower temperature of the refrigerant flowing from the indoor heat exchanger 100 to the outdoor heat exchanger 200. Because the temperature of the outdoor environment is low, the frost speed of the outdoor heat exchanger 200 is accelerated, thereby reducing the heat exchange effect of the outdoor heat exchanger 200.

[0056] refer to Figure 1 、 Figure 4 and Figure 8The air conditioning system further includes a four-way valve 360, a third branch 600, a fourth branch 700, and a third valve 610. The indoor heat exchanger 100 includes a first indoor unit coil 110 and a second indoor unit coil 120 that are arranged alternately. The first ends of the first indoor unit coil 110 and the second indoor unit coil 120 are both connected to one end of the first pipe 310, and the other end of the first pipe 310 is connected to one end of the first branch 400 and the second branch 500. One end of the third branch 600 and the fourth branch 700 are respectively connected to the first indoor unit coil 110 and the first indoor unit coil 120. The second end of the second indoor unit coil 120 is connected, and the other ends of the third branch 600 and the fourth branch 700 are both connected to the exhaust end of the compressor 300 through the four-way valve 360, so that the refrigerant flowing out of the compressor 300 can flow into the first indoor unit coil 110 and the second indoor unit coil 120. The third valve 610 is arranged on the third branch 600, and the third valve 610 can close the third branch 600, so that the refrigerant flowing out of the compressor 300 only flows into the second indoor unit coil 120, so as to reduce the heat exchange between the refrigerant and the indoor environment.

[0057] It is understood that when the air conditioning system is in high-temperature sterilization mode, the refrigerant flowing out of the exhaust port of the compressor 300 first flows into the first indoor unit coil 110 and the second indoor unit coil 120 in the indoor heat exchanger 100, then flows into the first outdoor unit coil 210 and the second outdoor unit coil 220 in the outdoor heat exchanger 200, and finally flows into the air intake port of the compressor 300, thereby completing the sterilization of the air conditioning system. When the indoor and outdoor ambient temperatures are low, the third valve 610 provided on the third branch 600 closes, allowing the refrigerant flowing out of the exhaust port of the compressor 300 to flow only into the second indoor unit coil 120. This reduces the heat exchange between the refrigerant in the second indoor unit coil 120 and the indoor environment, that is, reduces the heat dissipated by the refrigerant in the indoor environment, prevents the refrigerant from flowing into the first and second outdoor unit coils 210, 220 from being at a low temperature, effectively suppresses the rate of frost formation on the first and second outdoor coils 210, 220, and ensures the heat exchange efficiency of the outdoor heat exchanger 200.

[0058] In the embodiment of the present invention, a first low temperature threshold is preset in the air conditioning system. When the outdoor ambient temperature is less than or equal to the first low temperature threshold, it means that the outdoor ambient temperature is too low (which can also indirectly mean that the indoor ambient temperature is also low at this time). Figure 2Similarly, the heat exchange area of ​​the first indoor unit coil 110 is defined as A2, and the heat exchange area of ​​the second indoor unit coil 120 is defined as B2. The first indoor unit coil 110 and the second indoor unit coil 120 are arranged in an interlaced manner. When the air conditioning system is in conventional cooling mode, heating mode, and high-temperature sterilization mode, the refrigerant will flow through the first indoor unit coil 110 and the second indoor unit coil 120 simultaneously. That is, when the outdoor ambient temperature of the air conditioning system is greater than the first low-temperature threshold, the refrigerant will flow through the first indoor unit coil 110 and the second indoor unit coil 120 simultaneously. At this time, the heat exchange area of ​​the indoor heat exchanger 100 is A2 + B2. When the outdoor ambient temperature is less than or equal to the first low temperature threshold, the third valve 610 will close the third branch 600, so that the refrigerant flowing out of the exhaust end of the compressor 300 only flows into the second indoor unit coil 120. At this time, the heat exchange area of ​​the indoor heat exchanger 100 is B2, which reduces the heat exchange area of ​​the indoor heat exchanger 100, that is, reduces the heat dissipated by the refrigerant in the indoor heat exchanger 100 in the indoor environment, and avoids the temperature of the refrigerant flowing into the first outdoor unit coil 210 and the second outdoor unit coil 220 being too low.

[0059] In this embodiment of the present invention, when the third valve 610 closes the third branch 600, the first valve 410 and the second valve 510 remain open simultaneously. In this embodiment of the present invention, the first and second indoor coils 110, 120 are arranged in an interlaced manner, allowing heat dissipated from the first and second indoor coils 110, 120 to be transferred to each other. For illustration purposes, the closed state of the third branch 600 is used as an example. The refrigerant flowing from the exhaust port of the compressor 300 flows only into the second indoor coil 120. At this point, the refrigerant in the second indoor coil 120 is at a high temperature, raising the temperature of the second indoor coil 120 to a sterilization temperature. On the other hand, the first indoor unit coil 110 and the second indoor unit coil 120 are arranged in an interlaced manner, and the heat emitted by the second indoor unit coil 120 can also be transferred to the first indoor unit coil 110, so that the temperature of the first indoor unit coil 110 can also be raised to the sterilization temperature, thereby ensuring that the first indoor unit coil 110 and the second indoor unit coil 120 can both be at the sterilization temperature.

[0060] refer to Figure 1 、 Figure 4 and Figure 8The air conditioning system further includes a fourth valve 710. The third valve 610 is disposed on the third branch 600, and the fourth valve 710 is disposed on the fourth branch 700. The third valve 610 is used to open or close the third branch 600, and the fourth valve 710 is used to open or close the fourth branch 700, so that the refrigerant flowing out of the exhaust end of the compressor 300 can flow into the first indoor unit coil 110 and the second indoor unit coil 120 at the same time, or so that the refrigerant flowing out of the exhaust end of the compressor 300 can flow into the first indoor unit coil 110 or the second indoor unit coil 120. In the embodiment of the present utility model, when the third valve 610 closes the third branch 600, or the fourth valve 710 closes the fourth branch 700, the first valve 410 and the second valve 510 remain open at the same time.

[0061] As one embodiment of the present invention, the first indoor unit coil 110 and the second indoor unit coil 120 have the same heat exchange area. When the indoor and outdoor temperatures are low and the air conditioning system is in high-temperature sterilization mode, the third valve 610 is opened for a certain period of time while the fourth valve 710 is closed for a certain period of time, allowing the first and second indoor unit coils 110, 120 to be heated to and maintained at the sterilization temperature.

[0062] In another embodiment of the present invention, the first indoor unit coil 110 and the second indoor unit coil 120 have different heat exchange areas. A second low-temperature threshold is preset within the air conditioning system, and the second low-temperature threshold is lower than the first low-temperature threshold. This example illustrates a case where the heat exchange area of ​​the second indoor unit coil 120 is larger than that of the first indoor unit coil 110.

[0063] After the high-temperature sterilization mode of the air-conditioning system is running, when the outdoor ambient temperature is greater than the first low-temperature threshold, the third valve 610 and the fourth valve 710 remain open at the same time, so that the refrigerant flowing out of the exhaust end of the compressor 300 can flow into the first indoor unit coil 110 and the second indoor unit coil 120 at the same time.

[0064] When the outdoor ambient temperature is less than or equal to the first low temperature threshold and greater than the second low temperature threshold, the third valve 610 closes the third branch 600, and the fourth valve 710 remains open, so that the refrigerant flowing out of the indoor heat exchanger 100 flows only into the second indoor unit coil 120. It can be understood that the heat exchange area of ​​the second indoor unit coil 120 is larger than the heat exchange area of ​​the first indoor unit coil 110. When the outdoor ambient temperature is less than or equal to the first low temperature threshold and greater than the second low temperature threshold, it can be understood that the outdoor ambient temperature is not too low. In other words, there is no need to significantly reduce the heat exchange area of ​​the indoor heat exchanger 100. It is sufficient to simply close the first indoor unit coil 110, which has a smaller heat exchange area.

[0065] When the outdoor ambient temperature is less than or equal to the second low temperature threshold, the fourth valve 710 closes the fourth branch 700, and the third valve 610 remains open, allowing the refrigerant flowing from the compressor 300 exhaust port to flow only into the first indoor unit coil 110. It is understood that when the outdoor ambient temperature is less than or equal to the second low temperature threshold, it can be understood that the outdoor ambient temperature is too low, meaning that the heat exchange area of ​​the indoor heat exchanger 100 needs to be further reduced. Simply closing the second indoor unit coil 120, which has a larger heat exchange area, is sufficient. In this embodiment of the present invention, a first temperature detection mechanism is configured to detect the outdoor ambient temperature and compare it with the first low temperature threshold and the second low temperature threshold. This allows the refrigerant flowing from the compressor 300 exhaust port to flow into both the first indoor unit coil 110 and the second indoor unit coil 120, or to flow into either the first indoor unit coil 110 or the second indoor unit coil 120. This allows the air conditioning system to adjust the heat exchange area of ​​the indoor heat exchanger 100 according to different low temperature thresholds, thereby increasing the flexibility of the air conditioning system.

[0066] refer to Figure 1 and Figure 5 The air conditioning system further includes a second pipeline 320, a third pipeline 330, a fourth pipeline 340 and a fifth pipeline 350. The four-way valve 360 ​​has a C interface, an S interface, an E interface and a D interface. The exhaust end of the compressor 300 is connected to the D interface through the fifth pipeline 350, and the intake end of the compressor 300 is connected to the S interface through the fourth pipeline 340. The other ends of the third branch 600 and the fourth branch 700 are both connected to the E interface through the third pipeline 330. The second ends of the first outdoor unit coil 210 and the second outdoor unit coil 220 are both connected to the E interface through the second pipeline 3 20 is connected to the C interface, the D interface can be connected to the E interface, and the C interface can be connected to the S interface, so that the refrigerant flowing out of the exhaust end of the compressor 300 first flows through the first indoor unit coil 110 and the second indoor unit coil 120, and then flows through the first outdoor unit coil 210 and the second outdoor unit coil 220, the D interface can be connected to the C interface, and the E interface can be connected to the S interface, so that the refrigerant flowing out of the exhaust end of the compressor 300 first flows through the first outdoor unit coil 210 and the second outdoor unit coil 220, and then flows through the first indoor unit coil 110 and the second indoor unit coil 120.

[0067] In an embodiment of the present utility model, the four-way valve 360 ​​is a common element in the air-conditioning field for changing the flow direction of the refrigerant. The C interface, S interface, E interface and D interface of the four-way valve 360 ​​and the connection method of the four interfaces are also common methods in the air-conditioning field and will not be further elaborated here.

[0068] refer to Figure 1 、 Figure 3 and Figure 9The air conditioning system further includes a fifth branch 800 and a fifth valve 810. One end of the fifth branch 800 is connected to the fifth pipe 350, and the other end of the fifth branch 800 is connected to the first branch 400 or the second branch 500. The fifth valve 810 can open the fifth branch 800 to allow some of the refrigerant flowing out of the exhaust port of the compressor 300 to flow into the first outdoor coil 210 or the second outdoor coil 220, thereby raising the temperature of the first outdoor coil 210 and the second outdoor coil 220 and melting the frost on the first outdoor coil 210 and the second outdoor coil 220. It is understood that when the outdoor temperature is too low and the air conditioning system has been operating in a high-temperature sterilization mode for a period of time, frost may form on the surfaces of the first outdoor coil 210 and the second outdoor coil 220. When frost forms on the first outdoor unit coil 210 and the second outdoor unit coil 220, the fifth valve 810 opens the fifth branch 800, so that part of the refrigerant flowing out of the exhaust end of the compressor 300 can flow into the fifth branch 800, and then part of the refrigerant flowing out of the exhaust end of the compressor 300 can flow into the first outdoor unit coil 210 or the second outdoor unit coil 220, so that the temperature of the first outdoor unit coil 210 and the second outdoor unit coil 220 increases, and then the frost layer on the first outdoor unit coil 210 and the second outdoor unit coil 220 can melt, so as to achieve the purpose of defrosting, and ensure the heat exchange effect of the outdoor heat exchanger 200.

[0069] It needs to be explained that the air-conditioning system has a corresponding frost sensing module to determine when the outdoor heat exchanger 200 will be frosted. The frost sensing module is a common module in air conditioners and will not be further described here.

[0070] In this embodiment of the present invention, the first and second outdoor coils 210, 220 are interleaved, allowing heat dissipated from the first and second outdoor coils 210, 220 to be transferred to each other. Refrigerant flowing from the exhaust port of the compressor 300 flows into either the first or second outdoor coil 210, 220. Heat dissipated from the first or second outdoor coil 210, 220, is also transferred to the other, causing the temperatures of the first and second outdoor coils 210, 220 to rise simultaneously, ensuring that both the first and second outdoor coils 210, 220 can defrost.

[0071] In this embodiment of the present invention, the fifth branch 800 is connected to the second branch 500, and the connection between the fifth branch 800 and the second branch 500 is located between the second valve 510 and the second outdoor unit coil 220. The first valve 410, the second valve 510, the third valve 610, the fourth valve 710, and the fifth valve 810 can all be solenoid valves, which are common components in the air conditioner field and will not be further described here.

[0072] As an embodiment of the present invention, refer to Figure 1 and Figure 4 The air-conditioning system further includes an outdoor fan 230 and an indoor fan 130. The outdoor fan 230 is used to blow air toward the outdoor heat exchanger 200, and the indoor fan 130 is used to blow air toward the indoor heat exchanger 100. The outdoor fan 230 and the indoor fan 130 are common components in the field of air conditioners and will not be further described here.

[0073] As a preferred embodiment of the present invention, the refrigerant flow direction of the air-conditioning system in various modes is roughly as follows:

[0074] Cooling mode: Reference Figure 6 As shown by the dashed arrows in the figure, the D port of the four-way valve 360 ​​is connected to the C port, the E port is connected to the S port, the first valve 410, the second valve 510, the third valve 610, and the fourth valve 710 are all open, the fifth valve 810 is closed, and the indoor fan 130 and the outdoor fan 230 remain on. The refrigerant flowing out of the exhaust port of the compressor 300 is split into the first and second outdoor unit coils 210, 220 via the fifth pipeline 350 and the second pipeline 320. The refrigerant flowing out of the first and second outdoor unit coils 210, 220 flows into the first branch 400 and the second branch 500, respectively. The refrigerant in the first and second branches 400, 500 merges and flows into the first pipeline 310. The refrigerant in the first pipeline 310 is split and flows into the first indoor unit coil 110 and the second indoor unit coil 120, respectively. The refrigerant in the first indoor unit coil 110 and the second indoor unit coil 120 flows into the third branch 600 and the fourth branch 700, respectively. The refrigerant in the third branch 600 and the fourth branch 700 merge and flow into the third pipeline 330. The refrigerant in the third pipeline 330 flows into the fourth pipeline 340 through the four-way valve 360. The refrigerant in the fourth pipeline 340 flows into the discharge port of the compressor 300.

[0075] Heating mode: Reference Figure 6As shown by the solid arrows in the figure, the D port of the four-way valve 360 ​​is connected to the E port, and the C port is connected to the S port. The first valve 410, the second valve 510, the third valve 610, and the fourth valve 710 are all open, the fifth valve 810 is closed, and the indoor fan 130 remains on. The refrigerant flowing out of the exhaust port of the compressor 300 is split into the third branch 600 and the fourth branch 700 through the fifth pipeline 350 and the third pipeline 330. The refrigerant in the third branch 600 and the fourth branch 700 flows into the first indoor unit coil 110 and the second indoor unit coil 120, respectively. The refrigerant flowing out of the first indoor unit coil 110 and the second indoor unit coil 120 merge and flow into the first pipeline 310. The refrigerant in the first pipeline 310 is split into the first branch 400 and the second branch 500. The refrigerant in the first branch 400 and the second branch 500 flows into the first outdoor unit coil 210 and the second outdoor unit coil 220, respectively. The refrigerant in the first and second outdoor unit coils 210 and 220 merges and flows into the second pipeline 320. The refrigerant in the second pipeline 320 flows into the exhaust port of the compressor 300 through the four-way valve 360 ​​and the fourth pipeline 340.

[0076] High temperature sterilization mode: reference Figure 6 As shown by the solid arrows in the figure, the D port of the four-way valve 360 ​​is connected to the E port, and the C port is connected to the S port. The first valve 410, the second valve 510, the third valve 610, and the fourth valve 710 are all open, the fifth valve 810 is closed, and the indoor fan 130 remains off. The refrigerant flowing out of the exhaust port of the compressor 300 is split into the third branch 600 and the fourth branch 700 through the fifth pipeline 350 and the third pipeline 330. The refrigerant in the third branch 600 and the fourth branch 700 flows into the first indoor unit coil 110 and the second indoor unit coil 120, respectively. The refrigerant flowing out of the first indoor unit coil 110 and the second indoor unit coil 120 merge and flow into the first pipeline 310. The refrigerant in the first pipeline 310 is split into the first branch 400 and the second branch 500. The refrigerant in the first branch 400 and the second branch 500 flows into the first outdoor unit coil 210 and the second outdoor unit coil 220, respectively. The refrigerant in the first and second outdoor unit coils 210 and 220 merges and flows into the second pipeline 320. The refrigerant in the second pipeline 320 flows into the exhaust port of the compressor 300 through the four-way valve 360 ​​and the fourth pipeline 340.

[0077] High temperature sterilization mode, and the outdoor environment is high: reference Figure 7As shown by the solid arrows in the figure, the D port of the four-way valve 360 ​​is connected to the E port, and the C port is connected to the S port. The first valve 410 and the fifth valve 810 are closed, the second valve 510, the third valve 610, and the fourth valve 710 are all open, and the outdoor fan 230 and the indoor fan 130 remain off. The refrigerant flowing out of the exhaust port of the compressor 300 is split into the third branch 600 and the fourth branch 700 through the fifth pipeline 350 and the third pipeline 330. The refrigerant in the third branch 600 and the fourth branch 700 flows into the first indoor unit coil 110 and the second indoor unit coil 120, respectively. The refrigerant flowing out of the first indoor unit coil 110 and the second indoor unit coil 120 merges and flows into the first pipeline 310. The refrigerant in the first pipeline 310 flows to the second branch 500. The refrigerant in the second branch 500 flows into the second outdoor unit coil 220, and the refrigerant in the second outdoor unit coil 220 flows into the second pipeline 320. The refrigerant in the second pipeline 320 flows into the exhaust port of the compressor 300 through the four-way valve 360 ​​and the fourth pipeline 340 .

[0078] High temperature sterilization mode, and the outdoor and indoor ambient temperatures are low (the outdoor heat exchanger 200 is not frosted): Reference Figure 8 As shown by the solid arrows in the figure, the D port of the four-way valve 360 ​​is connected to the E port, and the C port is connected to the S port. The first valve 410, the second valve 510, and the third valve 610 are open, the fourth valve 710 and the fifth valve 810 are closed, and the outdoor fan 230 and the indoor fan 130 remain off. The refrigerant flowing out of the exhaust port of the compressor 300 is split into the third branch 600 through the fifth pipeline 350 and the third pipeline 330. The refrigerant in the third branch 600 flows into the first indoor unit coil 110. The refrigerant flowing out of the first indoor unit coil 110 flows into the first pipeline 310. The refrigerant in the first pipeline 310 is split into the first branch 400 and the second branch 500. The refrigerant in the first branch 400 and the second branch 500 flows into the first outdoor unit coil 210 and the second outdoor unit coil 220, respectively. The refrigerant in the first outdoor unit coil 210 and the second outdoor unit coil 220 merge and flow into the second pipeline 320. The refrigerant in the second pipeline 320 flows into the exhaust port of the compressor 300 through the four-way valve 360 ​​and the fourth pipeline 340 .

[0079] High temperature sterilization mode, and the outdoor and indoor ambient temperatures are low, and the outdoor heat exchanger 200 is frosted: Reference Figure 9As shown by the solid arrows in the figure, port D of four-way valve 360 ​​is connected to port E, and port C is connected to port S. First valve 410, third valve 610, and fifth valve 810 are open, while second valve 510 and fourth valve 710 are closed. Outdoor fan 230 and indoor fan 130 remain off. A portion of the refrigerant flowing out of the compressor 300's exhaust port flows through fifth branch 800 into second branch 500. A portion of the refrigerant in second branch 500 flows into the second outdoor unit coil 220, and a portion of the refrigerant in the second outdoor unit coil 220 flows into second pipeline 320. Another portion of the refrigerant flowing out of the compressor 300's exhaust port is split into third branch 600 through fifth pipeline 350 and third pipeline 330. Another portion of the refrigerant in third branch 600 flows into first indoor unit coil 110. Another portion of the refrigerant flowing out of first indoor unit coil 110 flows into first pipeline 310. Another portion of the refrigerant in first pipeline 310 flows into first branch 400. Another portion of the refrigerant in the first branch 400 flows into the first outdoor unit coil 210, and another portion of the refrigerant in the first outdoor unit coil 210 flows into the second pipeline 320. The refrigerant in the second pipeline 320 flows into the exhaust port of the compressor 300 through the four-way valve 360 ​​and the fourth pipeline 340.

[0080] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An air conditioning system, characterized in that: include: An outdoor heat exchanger, a compressor and an indoor heat exchanger, wherein a circuit for refrigerant flow is formed between the outdoor heat exchanger, the compressor and the indoor heat exchanger; a first pipeline, a first branch and a second branch, wherein one end of the first branch and one end of the second branch are both connected to the first end of the indoor heat exchanger through the first pipeline; The outdoor heat exchanger includes a first outdoor coil and a second outdoor coil arranged alternately, wherein the first ends of the first outdoor coil and the second outdoor coil are respectively connected to the other ends of the first branch and the second branch, so that the refrigerant flowing out of the indoor heat exchanger can flow into the first outdoor coil and the second outdoor coil; The first valve is arranged on the first branch, and the first valve can close the first branch so that the refrigerant flowing out of the indoor heat exchanger only flows into the second outdoor unit coil, so as to reduce the heat exchange between the refrigerant and the outdoor environment.

2. The air conditioning system according to claim 1, characterized in that: It also includes a second valve, which is arranged on the second branch. The second valve is used to open or close the second branch. The first valve is used to open or close the first branch so that the refrigerant flowing out of the indoor heat exchanger can flow into the first outdoor unit coil and the second outdoor unit coil at the same time, or the refrigerant flowing out of the indoor heat exchanger can flow into the first outdoor unit coil or the second outdoor unit coil.

3. The air conditioning system according to claim 2, characterized in that: The first outdoor unit coil and the second outdoor unit coil have different heat exchange areas.

4. The air conditioning system according to claim 2, characterized in that: A first throttling element and a second throttling element, wherein the first throttling element is arranged on the first branch, and the second throttling element is arranged on the second branch.

5. The air conditioning system according to claim 4, characterized in that: The invention also includes a first filter and a second filter, wherein the first filter is arranged on the first branch, and the second filter is arranged on the second branch.

6. The air conditioning system according to claim 1, characterized in that: It also includes a four-way valve, a third branch, a fourth branch and a third valve. The indoor heat exchanger includes a first indoor unit coil and a second indoor unit coil that are staggered with each other. The first ends of the first indoor unit coil and the second indoor unit coil are both connected to one end of the first pipeline, and the other end of the first pipeline is connected to one end of the first branch and the second branch. One end of the third branch and the fourth branch are respectively connected to the second end of the first indoor unit coil and the second indoor unit coil. The other ends of the third branch and the fourth branch can be connected to the exhaust end of the compressor through the four-way valve so that the refrigerant flowing out of the compressor can flow into the first indoor unit coil and the second indoor unit coil. The third valve is arranged on the third branch. The third valve can close the third branch so that the refrigerant flowing out of the compressor only flows into the second indoor unit coil to reduce the heat exchange between the refrigerant and the indoor environment.

7. The air conditioning system according to claim 6, characterized in that: It also includes a fourth valve, which is arranged on the fourth branch and is used to open or close the fourth branch. The third valve is used to open or close the third branch, so that the refrigerant flowing out of the compressor exhaust end can flow into the first indoor unit coil and the second indoor unit coil at the same time, or the refrigerant flowing out of the compressor exhaust end can flow into the first indoor unit coil or the second indoor unit coil.

8. The air conditioning system according to claim 7, characterized in that: The first indoor unit coil and the second indoor unit coil have different heat exchange areas.

9. The air conditioning system according to claim 6, characterized in that: The invention also includes a second pipeline, a third pipeline, a fourth pipeline and a fifth pipeline. The four-way valve has a C interface, an S interface, an E interface and a D interface. The exhaust end of the compressor is connected to the D interface through the fifth pipeline, and the intake end of the compressor is connected to the S interface through the fourth pipeline. The other ends of the third branch and the fourth branch are both connected to the E interface through the third pipeline. The second ends of the first outdoor unit coil and the second outdoor unit coil are both connected to the C interface through the second pipeline. The D interface can be connected to the E interface, and the C interface can be connected to the S interface, so that the refrigerant flowing out of the compressor exhaust end first flows through the first indoor unit coil and the second indoor unit coil, and then flows through the first outdoor unit coil and the second outdoor unit coil. The D interface can be connected to the C interface, and the E interface can be connected to the S interface, so that the refrigerant flowing out of the compressor exhaust end first flows through the first outdoor unit coil and the second outdoor unit coil, and then flows through the first indoor unit coil and the second indoor unit coil.

10. The air conditioning system according to claim 9, characterized in that: It also includes a fifth branch and a fifth valve, one end of the fifth branch is connected to the fifth pipeline, and the other end of the fifth branch is connected to the first branch or the second branch. The fifth valve can open the fifth branch to allow part of the refrigerant flowing out of the compressor exhaust end to flow into the first outdoor unit coil or the second outdoor unit coil, so as to increase the temperature of the first outdoor unit coil and the second outdoor unit coil and melt the frost layer on the first outdoor unit coil and the second outdoor unit coil.

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