Recyclable solution defrosting device, air conditioner and control method

Abstract

This invention provides a recyclable solution defrosting device, an air conditioner, and a control method. The recyclable solution defrosting device includes a liquid storage device, a connecting device, and a spraying device. The liquid storage device is connected to a first four-way valve of the air conditioner and includes a solution collector located below the outdoor unit of the air conditioner to collect solution dripping from the outdoor unit. One end of the connecting device is connected to a first expansion valve of the air conditioner, and the other end is connected to the liquid storage device, connecting the liquid storage device to the air conditioner's circulation system to allow refrigerant from the air conditioner to enter the liquid storage device. The spraying device is located above the outdoor unit of the air conditioner and connected to the liquid storage device for spraying the solution. This invention not only recycles the solution but also ensures that the solution concentration does not decrease, thus ensuring defrosting efficiency.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, specifically to a recyclable solution defrosting device, an air conditioner, and a control method. Background Technology

[0002] When an air conditioner with heating function is running, the outdoor unit is prone to frost buildup in low-temperature environments, affecting its operation. Currently, the commonly used defrosting methods are reverse cycle defrosting and solution defrosting. Reverse cycle defrosting switches the heating cycle to a cooling cycle, using high-temperature, high-pressure refrigerant to melt the frost layer on the outdoor unit. However, this sacrifices heating efficiency and reduces the user experience.

[0003] Solution defrosting refers to using a high concentration of organic or inorganic salts to melt the frost layer without sacrificing heating performance. However, the concentration of the solution in existing solution defrosting methods gradually decreases over time, leading to a decline in defrosting effectiveness. Summary of the Invention

[0004] This invention provides a recyclable solution defrosting device, air conditioner, and control method, aiming to solve the problem that the concentration of the current solution for defrosting decreases over time, resulting in a poorer defrosting effect.

[0005] In a first aspect, the present invention provides a recyclable solution defrosting device, comprising a liquid storage device, a connecting device, and a spraying device; the liquid storage device is connected to a first four-way valve of the air conditioner and includes a solution collector located below the outdoor unit of the air conditioner for collecting solution dripping from the outdoor unit; one end of the connecting device is connected to a first expansion valve of the air conditioner, and the other end of the connecting device is connected to the liquid storage device for connecting the liquid storage device to the circulation system of the air conditioner so that the refrigerant of the air conditioner enters the liquid storage device; the spraying device is located above the outdoor unit of the air conditioner and connected to the liquid storage device for spraying the solution.

[0006] Furthermore, the liquid storage device also includes a regenerator, which is connected to the solution collector, the communication device, the liquid storage device, and the first four-way valve.

[0007] Furthermore, the communication device includes a second expansion valve, one end of which is connected to the first expansion valve, and the other end of which is connected to the regenerator.

[0008] Furthermore, the liquid storage device also includes a liquid storage tank and a solution pump; the liquid storage tank is connected to the solution pump and the solution collector respectively, and the solution pump is connected to the spraying device.

[0009] Secondly, the present invention provides an air conditioner, the air conditioner comprising an indoor unit, an outdoor unit, a compressor, a first four-way valve, a second four-way valve, a first expansion valve, and a recyclable solution defrosting device as described in any one of the above; the compressor is connected to the first four-way valve, the first four-way valve is connected to the outdoor unit, the second four-way valve, and the liquid storage device of the recyclable solution defrosting device respectively, the second four-way valve is connected to the compressor and the outdoor unit respectively, the outdoor unit is connected to the first expansion valve, and the first expansion valve is connected to the indoor unit and the communication device of the recyclable solution defrosting device respectively.

[0010] Furthermore, the compressor is provided with two air intake ports.

[0011] Thirdly, the present invention also provides a control method, the method comprising:

[0012] If the air conditioner is detected to be in operation, the temperature difference between the internal temperature and the external temperature of the outdoor unit of the air conditioner is confirmed.

[0013] If the temperature difference is greater than the first preset threshold, the air conditioner's connection device is activated, and the first four-way valve of the air conditioner is controlled to switch so that the outdoor unit and the air conditioner's liquid storage device are connected in parallel to enter the defrost mode.

[0014] The present invention discloses a recyclable solution defrosting device, an air conditioner, and a control method. The spray device of the recyclable solution defrosting device can spray the solution in the storage tank onto the outdoor unit, thereby defrosting the outdoor unit. Excess solution drips from the outdoor unit and re-enters the storage tank. At the same time, the connecting device is connected to the first expansion valve of the air conditioner, connecting the storage tank to the circulation system of the air conditioner, so that the refrigerant in the air conditioner enters the storage tank. Since the solution temperature is high and the refrigerant temperature is low, the refrigerant can absorb the temperature of the solution, causing the solution to freeze, reducing the water content of the solution, thereby increasing the concentration of the solution and ensuring that the defrosting effect is not reduced. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the circulation system of an air conditioner provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of an air conditioner in cooling mode according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the air conditioner in heating mode according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of an air conditioner in defrost mode according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of an air conditioner in de-icing mode according to an embodiment of the present invention;

[0021] Figure 6 This is a flowchart illustrating a control method provided in an embodiment of the present invention;

[0022] Figure descriptions: 100, Air conditioner; 10, Recyclable solution defrosting device; 11, Liquid storage device; 111, Solution collector; 112, Regenerator; 113, Liquid storage tank; 114, Solution pump; 12, Connecting device; 13, Spraying device; 20, Indoor unit; 30, Outdoor unit; 40, Compressor; 50, First four-way valve; 60, Second four-way valve; 70, First expansion valve; 80, Gas-liquid separator. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0024] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0026] Furthermore, the directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying drawings and the product's usage state. Therefore, the directional terms used are for illustrating and understanding this invention, and not for limiting it. Additionally, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.

[0027] See Figures 1 to 5 , Figure 1 This is a schematic diagram of the circulation system of an air conditioner 100 provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the air conditioner 100 in cooling mode according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the air conditioner 100 in heating mode according to an embodiment of the present invention; Figure 4 This is a schematic diagram of an air conditioner 100 in defrost mode according to an embodiment of the present invention; Figure 5 This is a schematic diagram of an air conditioner 100 in de-icing mode according to an embodiment of the present invention. Figure 1 As shown, the recyclable solution defrosting device 10 includes a liquid storage device 11, a connecting device 12, and a spraying device 13. The liquid storage device 11 is connected to the first four-way valve 50 of the air conditioner 100 and includes a solution collector 111. The solution collector 111 is located below the outdoor unit 30 of the air conditioner 100 and is used to collect the solution dripping from the outdoor unit 30. One end of the connecting device 12 is connected to the first expansion valve 70 of the air conditioner 100, and the other end of the connecting device 12 is connected to the liquid storage device 11, which is used to connect the liquid storage device 11 to the circulation system of the air conditioner 100 so that the refrigerant of the air conditioner 100 enters the liquid storage device 11. The spraying device 13 is located above the outdoor unit 30 of the air conditioner 100 and is connected to the liquid storage device 11, and is used to spray the solution.

[0029] Specifically, the liquid storage device 11 may include a regeneration unit and a liquid storage unit. The liquid storage unit stores a solution, which may be an organic salt solution or an inorganic salt solution; preferably, the solution is an organic salt solution. A spray device 13 is positioned above the outdoor unit 30. The spray device 13 may be a nozzle, which may include multiple water outlets. The spray device 13 is also connected to the liquid storage device 11. For example, the inlet of the spray device 13 is connected to the liquid storage unit of the liquid storage device 11. When spraying is required, the solution enters the spray device 13 from the liquid storage unit and is sprayed onto the surface of the outdoor unit 30 through the water outlet of the spray device 13. This allows the solution to absorb moisture from the frost layer on the outdoor unit 30, thereby achieving defrosting. The collection unit of the liquid storage device 11 may also be positioned below the outdoor unit 30 to collect the solution dripping from the outdoor unit 30 and allow it to enter the regeneration unit through a connected pipe.

[0030] The air conditioner 100's circulation system includes a cooling cycle and a heating cycle, and the connecting device 12 is used to connect the liquid storage device 11 to the air conditioner 100's circulation system. For example... Figure 1 As shown, the connecting device 12 can be an electronic expansion valve, which is connected to the first expansion valve 70 of the air conditioner 100. When the connecting device 12 is activated, it connects to the first expansion valve 70, allowing refrigerant to enter the connecting device 12 from the first expansion valve 70, and then from the connecting device into the regeneration unit of the liquid storage device 11. Figure 1 The regenerator 112 contains a solution dripping from the outdoor unit 30 and refrigerant transported by the connecting device 12. The solution in the outdoor unit 30 absorbs a lot of moisture and releases heat after entering the regenerator. Meanwhile, the refrigerant begins to absorb heat in the regenerator, causing the solution temperature to drop and eventually freeze, increasing the solution concentration. Finally, the solution with increased concentration is stored in the liquid storage unit.

[0031] like Figure 2 As shown, when the air conditioner 100 is in cooling mode, the indoor unit 20 acts as the evaporator, and the outdoor unit 30 acts as the condenser. At this time, the first expansion valve 70 is operational, the connecting device 12 is closed, and the first four-way valve 50 and the second four-way valve 60 do not switch directions. The refrigerant, after being compressed by the compressor 40, enters the outdoor unit 30 to release heat through the second four-way valve 60 and the first four-way valve 50, then enters the indoor unit 20 after being throttled by the first expansion valve 70, and finally returns to the compressor 40. In cooling mode, since the outdoor unit 30 acts as the condenser, its temperature generally does not differ significantly from the ambient temperature, and the outdoor unit 30 typically does not frost.

[0032] like Figure 3As shown, when the air conditioner 100 is in heating mode, the indoor unit 20 acts as the condenser, and the outdoor unit 30 acts as the evaporator. At this time, the first expansion valve 70 operates, the connecting device 12 is closed, the second four-way valve 60 reverses, and the first four-way valve 50 does not reverse. The refrigerant, after being compressed by the compressor 40, enters the indoor unit 20 to release heat, then passes through the first expansion valve 70 for throttling before entering the outdoor unit 30, and finally returns to the compressor 40. In heating mode, the outdoor unit 30 acts as the evaporator, and its temperature is typically higher, resulting in a larger temperature difference with the external environment. Therefore, in heating mode, the temperature difference between the outdoor unit 30 and the external environment can be detected to determine whether defrosting mode is needed.

[0033] like Figure 4 As shown, in heating mode, when the temperature difference between the outdoor unit 30 and the external environment is large, the defrost mode can be entered. In defrost mode, the recirculating solution defrost device 10 starts working. During operation, the solution is pumped from the liquid storage device 11 into the spray device 13, which sprays the solution onto the outdoor unit 30 to complete defrosting. At the same time, the solution collector 111 collects the solution, which is a diluted solution that enters the regeneration unit. Simultaneously, the spray device 13 starts spraying, the connecting device 12 is activated, and the first four-way valve 50 of the air conditioner 100 is reversed, so that the outdoor unit 30 and the regeneration unit are connected in parallel and work together as evaporators. At this time, the indoor unit 20 acts as a condenser. After the refrigerant is throttled to the evaporation pressure P1 by the first expansion valve 70, one path enters the outdoor unit 30 for evaporation and heat absorption, while the other path is throttled to the evaporation pressure P2 by the second expansion valve and enters the regeneration unit. In the regeneration unit, the solution releases heat, and the refrigerant absorbs heat. Water in the dilute solution condenses into ice, increasing its concentration before returning to the liquid storage container. The refrigerant that has absorbed heat in the regeneration unit then enters the compressor 40 via the first four-way valve 50 and the second four-way valve 60. The refrigerant in the outdoor unit 30 enters the compressor 40 via the first four-way valve 50. When the compressor 40 compresses the refrigerant from pressure P2 to P1 (i.e., compresses the pressure of the refrigerant flowing from the regeneration unit to P1), the compressor 40 mixes the refrigerants from both sources to form a high-temperature, high-pressure gas.

[0034] like Figure 5 As shown, in defrost mode, the refrigerant inside the regenerator absorbs moisture from the solution, lowering the solution temperature and thus reducing the temperature of the regenerator. When the temperature inside the regenerator drops to the point of freezing, or when the pipes connected to the regenerator freeze, the defrosting mode can be entered. In defrosting mode, the spray device 13 stops spraying the solution, the connecting device 12 remains open, the indoor unit 20 and outdoor unit 30 act as evaporators, and the regenerator acts as a condenser. High-temperature refrigerant enters the regenerator after exiting the compressor 40. The high temperature of the refrigerant raises the temperature of the regenerator, causing the ice layer on the regenerator to melt. After releasing heat, the refrigerant enters the compressor 40 through the indoor unit 20 and the second four-way valve 60.

[0035] As a further embodiment, the liquid storage device 11 also includes a regenerator 112, which is connected to the solution collector 111, the communication device 12, the liquid storage device 11, and the first four-way valve 50.

[0036] The liquid storage device 11 may include a regeneration component and a liquid storage component. Specifically, the regeneration component may be a regenerator 112, used to collect the solution and refrigerant. The solution located in the regenerator 112 releases heat, while the refrigerant absorbs heat, thereby lowering the temperature of the solution. Since the freezing temperature of the salt solution is below 0°C, water will freeze and precipitate first, thereby reducing the water content in the salt solution and increasing the concentration of the salt solution.

[0037] As a further embodiment, the communication device 12 includes a second expansion valve, one end of which is connected to the first expansion valve 70, and the other end of which is connected to the regenerator 112.

[0038] The connecting device 12 may include a second expansion valve, which may be an electronic expansion valve connected to the first expansion valve 70 and the regeneration component of the air conditioner 100.

[0039] As a further embodiment, the liquid storage device 11 also includes a liquid storage tank 113 and a solution pump 114; the liquid storage tank 113 is connected to the solution pump 114 and the solution collector 111 respectively, and the solution pump 114 is connected to the spray device 13.

[0040] The storage tank 113 is used to store the solution, and the solution pump 114 is used to pump the solution out of the storage tank 113.

[0041] The present invention also provides an air conditioner 100, the air conditioner 100 including an indoor unit 20, an outdoor unit 30, a compressor 40, a first four-way valve 50, a second four-way valve 60, a first expansion valve 70, and a recyclable solution defrosting device 10 as described in any of the above embodiments; the compressor 40 is connected to the first four-way valve 50, the first four-way valve 50 is connected to the outdoor unit 30, the second four-way valve 60, and the liquid storage device 11 of the recyclable solution defrosting device 10, the second four-way valve 60 is connected to the compressor 40 and the outdoor unit 30, the outdoor unit 30 is connected to the first expansion valve 70, and the first expansion valve 70 is connected to the indoor unit 20 and the recyclable solution defrosting device 10 via a connecting device 12.

[0042] Specifically, the normal operating modes of the air conditioner 100 include cooling mode and heating mode. In cooling mode, the recirculating solution defrosting device 10 is not activated, and the air conditioner 100 operates normally. In heating mode, when the temperature difference between the outdoor unit 30 and the external environment is large, the recirculating solution defrosting device 10 is activated to enter defrosting mode. It should be noted that in defrosting mode, the outdoor unit 30 and the regenerator 112 are connected in parallel and together act as the evaporator, while the indoor unit 20 acts as the condenser, and the air conditioner 100 remains in heating mode. After defrosting is completed, if the outdoor unit 30 and the external environment return to normal, or if the air conditioner 100 enters cooling mode, the recirculating solution defrosting device 10 can be turned off to exit defrosting mode. If the regenerator 112 freezes due to excessively low temperature during the defrosting process, defrosting can be stopped, and the regenerator components can be de-iced.

[0043] As a further embodiment, the compressor 40 is provided with two air intake ports.

[0044] Among them, such as Figure 1 As shown, the compressor 40 may include two suction ports. One suction port serves as the first suction port and is connected to the gas-liquid separator 80, which is connected to the second four-way valve 60. The other suction port serves as the second suction port and is connected to the first four-way valve 50. In defrost mode, the refrigerant is split into two paths from the first expansion valve 70. One path enters the outdoor unit 30, and the other path enters the regenerator 112 via the connecting device 12. The low-temperature, low-pressure refrigerant exiting the regenerator 112 enters the first suction port and is compressed by the compressor 40. When the pressure of the refrigerant rises to the corresponding evaporation pressure, the refrigerant exiting the outdoor unit 30 enters the second suction port and mixes with the previous refrigerant in the compressor 40, completing the second half of the compression process. This results in a high-temperature, high-pressure refrigerant, which is then used for indoor heating, thereby reducing the pressure ratio and improving operating efficiency.

[0045] See Figure 6 The present invention also provides a control method for controlling the air conditioner described in any of the above embodiments, the method comprising steps S110-S120.

[0046] S110, if the air conditioner is detected to be in operation, the temperature difference between the internal temperature and the external temperature of the outdoor unit of the air conditioner is confirmed.

[0047] In this embodiment of the invention, when the air conditioner is in operation, for example, in heating mode, the temperature difference between the internal temperature of the outdoor unit and the external temperature of the surrounding environment can be confirmed in real time.

[0048] In some embodiments, such as this embodiment, the following steps are included after step S110:

[0049] Confirm the operating mode of the air conditioner;

[0050] If the air conditioner is in heating mode, proceed to the step of confirming the temperature difference between the internal temperature and the external temperature of the outdoor unit of the air conditioner;

[0051] If the air conditioner is in cooling mode, then the communication device is turned off.

[0052] In this embodiment of the invention, the air conditioner typically includes two operating modes: a cooling mode and a heating mode. In cooling mode, the temperature difference between the internal temperature of the outdoor unit and the external temperature of the surrounding environment is not significant; therefore, the outdoor unit's temperature does not need to be monitored in cooling mode. Simultaneously, if the air conditioner switches from heating mode to cooling mode and the recirculating solution defrosting device is activated, the connecting device can be closed to disconnect the recirculating solution defrosting device from the air conditioner's circulation system, and then the recirculating solution defrosting device can be shut down.

[0053] When the air conditioner is in heating mode, the temperature difference between the indoor and outdoor temperatures of the outdoor unit will gradually increase. Therefore, it is necessary to confirm whether the temperature difference is greater than the first preset threshold.

[0054] S120, if the temperature difference is greater than the first preset threshold, the air conditioner's connection device is activated, and the first four-way valve of the air conditioner is controlled to switch so that the outdoor unit and the air conditioner's liquid storage device are connected in parallel to enter the defrost mode.

[0055] In this embodiment of the invention, when the temperature difference is greater than the first preset threshold, the connecting device can be activated to connect the air conditioner's circulation system with the recyclable solution defrosting device, and then the first four-way valve is controlled to switch, so that the outdoor unit and the liquid storage device are connected in parallel and enter the defrosting mode.

[0056] like Figure 4As shown, in defrost mode, the recirculating solution defrosting device starts working. During operation, the solution is pumped from the liquid receiver into the spray device, which sprays the solution onto the outdoor unit, completing defrosting. Simultaneously, the solution collector 111 collects the diluted solution, which then enters the regeneration unit. At the same time as the spray device begins spraying, the connecting device activates, and the first four-way valve of the air conditioner reverses, connecting the outdoor unit and the regeneration unit in parallel, acting as evaporators together. The indoor unit then acts as a condenser. The refrigerant, after being throttled to evaporation pressure P1 by the first expansion valve, enters the outdoor unit for evaporation and heat absorption, while the other route is throttled to evaporation pressure P2 by the second expansion valve and enters the regeneration unit. In the regeneration unit, the solution releases heat, and the refrigerant absorbs heat. Water in the diluted solution condenses into ice, increasing the concentration, and returns to the liquid receiver. The refrigerant that has absorbed heat in the regeneration unit then enters the compressor via the first and second four-way valves. The refrigerant in the outdoor unit enters the compressor through the first four-way valve. When the compressor compresses the refrigerant at pressure P2 to P1, that is, when the pressure of the refrigerant flowing out from the regeneration unit is compressed to P1, the compressor mixes the refrigerants from the two circuits to form a high-temperature, high-pressure gas.

[0057] In some embodiments, such as this embodiment, the control method further includes the following steps:

[0058] The temperature of the liquid storage device is detected, and when the temperature of the liquid storage device is lower than the second preset threshold, the communication device is activated, and the first four-way valve is controlled to switch so that the outdoor unit and the indoor unit of the air conditioner are connected in parallel to enter the defrosting mode.

[0059] In embodiments of the present invention, such as Figure 5 As shown, in defrost mode, the refrigerant inside the regenerator absorbs moisture from the solution, lowering the solution's temperature and consequently reducing the regenerator's temperature. When the temperature inside the regenerator drops to the point of freezing, or when the pipes connected to the regenerator freeze, the defrosting mode is activated. In defrosting mode, the spray system stops spraying solution, the connecting device remains open, the indoor and outdoor units act as evaporators, and the regenerator acts as a condenser. High-temperature refrigerant enters the regenerator from the compressor outlet; the high temperature of the refrigerant raises the temperature of the regenerator, causing the ice layer on it to melt. After releasing heat, the refrigerant passes through the indoor unit and the second four-way valve before entering the compressor.

[0060] The recyclable solution defrosting device, air conditioner, and control method disclosed in this invention can recycle the solution and increase its concentration, ensuring that the defrosting effect does not decrease over time.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A control method, characterized in that, This is applied to an air conditioner, which includes an indoor unit, an outdoor unit, a compressor, a first four-way valve, a second four-way valve, a first expansion valve, and a recirculating solution defrosting device, wherein the recirculating solution defrosting device includes: A liquid storage device, connected to the first four-way valve of the air conditioner, includes a solution collector located below the outdoor unit of the air conditioner for collecting solution dripping from the outdoor unit; A connecting device, one end of which is connected to the first expansion valve of the air conditioner, and the other end of which is connected to the liquid storage device, for connecting the liquid storage device to the circulation system of the air conditioner so that the refrigerant of the air conditioner enters the liquid storage device; A spraying device is installed above the outdoor unit of the air conditioner and connected to the liquid storage device for spraying the solution; The compressor is connected to the first four-way valve, the first four-way valve is connected to the outdoor unit, the second four-way valve and the liquid storage device of the recirculating solution defrosting device, the second four-way valve is connected to the compressor and the outdoor unit, the outdoor unit is connected to the first expansion valve, and the first expansion valve is connected to the indoor unit and the communication device of the recirculating solution defrosting device. The method includes: If the air conditioner is detected to be in operation, the temperature difference between the internal temperature and the external temperature of the outdoor unit of the air conditioner is confirmed. If the temperature difference is greater than the first preset threshold, the air conditioner's connection device is activated, and the first four-way valve of the air conditioner is controlled to switch so that the outdoor unit and the air conditioner's liquid storage device are connected in parallel to enter the defrost mode. The temperature of the liquid storage device is detected, and when the temperature of the liquid storage device is lower than the second preset threshold, the communication device is activated, and the first four-way valve is controlled to switch so that the outdoor unit and the indoor unit of the air conditioner are connected in parallel to enter the defrosting mode.

2. The method according to claim 1, characterized in that, The liquid storage device also includes a regenerator, which is connected to the solution collector, the communication device and the first four-way valve.

3. The method according to claim 2, characterized in that, The communication device includes a second expansion valve, one end of which is connected to the first expansion valve, and the other end of which is connected to the regenerator.

4. The method according to claim 1, characterized in that, The liquid storage device also includes a liquid storage tank and a solution pump; The storage tank is connected to the solution pump and the solution collector, respectively, and the solution pump is connected to the spraying device.

5. The method according to claim 1, characterized in that, The compressor has two air intake ports.

6. The method according to claim 1, characterized in that, After the step of detecting that the air conditioner is in operation, the following steps are included: Confirm the operating mode of the air conditioner; If the air conditioner is in heating mode, then proceed to the step of confirming the temperature difference between the internal temperature and the external temperature of the outdoor unit of the air conditioner.

7. The method according to claim 6, further comprising, after the step of confirming the operating mode of the air conditioner: If the air conditioner is in cooling mode, then the communication device is turned off.

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