Defrosting control method of air conditioning system, controller and air conditioning system

Abstract

The invention discloses a defrosting control method of an air conditioning system, a controller and the air conditioning system, the air conditioning system comprises an outdoor heat exchanger and an indoor heat exchanger, and the outdoor heat exchanger comprises a first heat exchanger and a second heat exchanger; the device further comprises a valve assembly. The defrosting control method comprises the steps that when a first heat exchanger and a second heat exchanger need to be defrosted, a valve assembly is controlled to output a part of refrigerant output by an exhaust port of a compressor to the first heat exchanger for defrosting; after the first heat exchanger is defrosted, the valve assembly is controlled to output a part of refrigerant output by the exhaust port of the compressor to the second heat exchanger for defrosting; after the second heat exchanger is defrosted, the valve assembly is controlled to output a part of refrigerant output by the exhaust port of the compressor to the first heat exchanger, so that the first heat exchanger is defrosted; and after the first heat exchanger is defrosted, defrosting is finished. In the embodiment of the invention, defrosting can be carried out while indoor heating is carried out, and the defrosting reliability is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of defrosting, and particularly to a defrosting control method, a controller and an air conditioning system for an air conditioning system. Background Art

[0002] At present, there are various defrosting methods for air conditioning systems, such as shutdown defrosting, reverse cycle defrosting and electric heating defrosting, etc. Among them, shutdown defrosting and reverse cycle defrosting require the indoor fan to stop, and heat cannot be output to the indoor environment during defrosting, which easily causes the indoor environment temperature to decrease and affects the comfort of users. Although electric heating defrosting does not affect the indoor environment temperature, the power consumption is relatively large. Therefore, the above defrosting methods all have some problems. Summary of the Invention

[0003] Embodiments of the present application provide a defrosting control method, a controller and an air conditioning system for an air conditioning system, which can defrost while heating the indoor environment and ensure the reliability of defrosting.

[0004] In a first aspect, embodiments of the present application provide a defrosting control method for an air conditioning system. The air conditioning system includes an outdoor heat exchanger and an indoor heat exchanger. The outdoor heat exchanger includes a first heat exchanger and a second heat exchanger, and the first heat exchanger is located below the second heat exchanger. The air conditioning system further includes a valve assembly for outputting a part of the refrigerant output from the exhaust port of the compressor to the first heat exchanger or the second heat exchanger and another part of the refrigerant to the indoor heat exchanger under defrosting conditions.

[0005] The defrosting control method includes:

[0006] When it is necessary to defrost the first heat exchanger and the second heat exchanger, control the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the first heat exchanger to defrost the first heat exchanger.

[0007] After the defrosting of the first heat exchanger is completed, control the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the second heat exchanger to defrost the second heat exchanger.

[0008] After the defrosting of the second heat exchanger is completed, control the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the first heat exchanger to defrost the first heat exchanger.

[0009] After the defrosting of the first heat exchanger is completed, end the defrosting.

[0010] In some embodiments, the valve assembly includes a first valve, a second valve, and a pipeline switching valve. The exhaust port of the compressor is connected to the first heat exchanger and the second heat exchanger respectively through the indoor heat exchanger. The first heat exchanger is connected to the intake port of the compressor through the first valve, and the second heat exchanger is connected to the intake port of the compressor through the second valve;

[0011] The first end of the pipeline switching valve communicates with the pipeline between the exhaust port of the compressor and the indoor heat exchanger. The second end of the pipeline switching valve communicates with the pipeline between the first valve and the first heat exchanger. The third end of the pipeline switching valve communicates with the pipeline between the second valve and the second heat exchanger.

[0012] In some embodiments, the valve assembly further includes a stop valve. The first end of the pipeline switching valve communicates with the pipeline between the exhaust port of the compressor and the indoor heat exchanger through the stop valve.

[0013] In some embodiments, controlling the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the first heat exchanger includes:

[0014] Opening the stop valve, controlling the pipeline switching valve to connect the first end and the second end, closing the first valve, and opening the second valve.

[0015] In some embodiments, controlling the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the second heat exchanger includes:

[0016] Opening the stop valve, controlling the pipeline switching valve to connect the first end and the third end, closing the second valve, and opening the first valve.

[0017] In some embodiments, the air-conditioning system further includes a first throttle valve and a second throttle valve. One end of the indoor heat exchanger is connected to the first throttle valve, and the other end of the first throttle valve is connected to the first heat exchanger and the second heat exchanger respectively through a shunt pipe. The first heat exchanger is connected in series with the second throttle valve;

[0018] The defrosting control method further includes:

[0019] In the heating mode, controlling the opening degree of the first throttle valve according to the exhaust temperature of the compressor, and controlling the second throttle valve to be at the maximum opening degree;

[0020] In the defrosting mode, controlling the opening degree of the first throttle valve according to the exhaust temperature of the compressor, and controlling the opening degree of the second throttle valve to be a preset opening degree. The size of the preset opening degree corresponds to the heat exchanger undergoing defrosting currently and is greater than the maximum opening degree of the first throttle valve.

[0021] In some embodiments, the defrost control method further includes:

[0022] In the defrost mode, at least one of the following is further performed:

[0023] Adjust the blower of the indoor heat exchanger to a first preset speed;

[0024] Adjust the blower of the outdoor heat exchanger to a second preset speed;

[0025] Control the operating frequency of the compressor to be a preset frequency;

[0026] The first preset speed is the low gear speed of the blower of the indoor heat exchanger.

[0027] In some embodiments, the defrost control method further includes:

[0028] During the defrosting process of the first heat exchanger, when the defrosting duration of the first heat exchanger reaches a first duration or the refrigerant outlet temperature of the first heat exchanger is greater than a first temperature threshold, end the defrosting of the first heat exchanger;

[0029] During the defrosting process of the second heat exchanger, when the defrosting duration of the second heat exchanger reaches a second duration or the refrigerant outlet temperature of the second heat exchanger is greater than a second temperature threshold, end the defrosting of the second heat exchanger.

[0030] In a second aspect, an embodiment of the present application provides a controller, including at least one processor and a memory communicatively connected to the at least one processor; the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to execute the defrost control method of the air conditioning system as described in the first aspect.

[0031] In a third aspect, an embodiment of the present application provides an air conditioning system, including the controller of the second aspect.

[0032] The defrosting control method, controller, and air conditioning system of the embodiment of the present application have at least the following beneficial effects: The first heat exchanger and the second heat exchanger of the outdoor heat exchanger can be defrosted separately, and the first heat exchanger is located below the second heat exchanger. By switching the refrigerant flow path through the valve assembly, the high-temperature and high-pressure refrigerant of the compressor passes through the indoor heat exchanger and the first heat exchanger respectively, so as to defrost the first heat exchanger while heating the indoor environment. After the first heat exchanger completes defrosting, the refrigerant flow path is switched through the valve assembly, so that the high-temperature and high-pressure refrigerant of the compressor passes through the indoor heat exchanger and the second heat exchanger respectively, thereby defrosting the second heat exchanger while heating the indoor environment. After the second heat exchanger completes defrosting, the refrigerant flow path is switched again through the valve assembly to defrost the first heat exchanger, which can avoid the problem that during the defrosting of the second heat exchanger, the defrosting water drops onto the first heat exchanger and refreezes, affecting the operation of the air conditioning system; Therefore, in addition to defrosting the outdoor heat exchanger while heating the indoor environment, the embodiment of the present application also solves the problem of incomplete defrosting of the heat exchanger located below, ensuring the reliability of defrosting.

[0033] Other features and advantages of the present application will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the specification and the drawings. Brief Description of the Drawings

[0034] Figure 1 is a schematic diagram of the air conditioning system provided by the embodiment of the present application;

[0035] Figure 2 is a flowchart of the defrosting control method provided by an embodiment of the present application;

[0036] Figure 3 is a flowchart of outputting a part of the refrigerant output from the exhaust port of the compressor to the first heat exchanger provided by an embodiment of the present application;

[0037] Figure 4 is Figure 2 a flowchart of the specific method for step S102 in

[0038] Figure 5 is a flowchart of the defrosting control method provided by another embodiment of the present application;

[0039] Figure 6 is a flowchart of the defrosting control method provided by another embodiment of the present application;

[0040] Figure 7 is a schematic diagram of the refrigerant flow direction of the air conditioning system provided by an example of the present application;

[0041] Figure 8Schematic diagram of a controller provided by an embodiment of the present application. Detailed implementation manners

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be adjusted or reordered in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are necessary sequences unless it is stated that a certain sequence must be followed.

[0043] In the description of the present application, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0044] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0045] At present, there are various defrosting methods for air-conditioning systems, such as shutdown defrosting, reverse cycle defrosting, electric heating defrosting, etc. Among them, during the process of shutdown defrosting and reverse cycle defrosting, the indoor cross-flow fan stops running, and heat cannot be output to the indoor environment during the defrosting period, directly causing the indoor environment temperature to drop, and the indoor environment temperature fluctuation affects the comfort of users; while electric heating defrosting does not affect the indoor environment temperature, but the power consumption is relatively large.

[0046] In addition, the current defrosting method for air conditioners also includes hot gas bypass defrosting. Hot gas bypass defrosting affects the compressor life and there are also problems of poor defrosting. There is ice accumulation on the outdoor unit during long-term heating, and reverse cycle defrosting is still required. Therefore, the above-mentioned defrosting methods cannot meet the key technical requirements of air conditioner defrosting.

[0047] Based on this, the embodiments of the present application provide a defrosting control method, a controller and an air conditioning system for an air conditioning system. The first heat exchanger and the second heat exchanger of the outdoor heat exchanger can be defrosted separately, and the first heat exchanger is located below the second heat exchanger. The refrigerant flow path is switched through a valve assembly, so that the high-temperature and high-pressure refrigerant of the compressor passes through the indoor heat exchanger and the first heat exchanger respectively, so as to defrost the first heat exchanger while heating the indoor space. After the first heat exchanger is defrosted, the refrigerant flow path is switched through the valve assembly, so that the high-temperature and high-pressure refrigerant of the compressor passes through the indoor heat exchanger and the second heat exchanger respectively, so as to defrost the second heat exchanger while heating the indoor space. After the second heat exchanger is defrosted, the refrigerant flow path is switched again through the valve assembly to defrost the first heat exchanger, which can avoid the problem that the defrosting water drops onto the first heat exchanger and refreezes during the defrosting process of the second heat exchanger, affecting the operation of the air conditioning system. Therefore, in addition to realizing defrosting of the outdoor heat exchanger while heating the indoor space, the embodiments of the present application also solve the problem of incomplete defrosting of the heat exchanger located below, ensuring the reliability of defrosting.

[0048] The defrosting control method, the controller and the air conditioning system for the air conditioning system will be described below with reference to the accompanying drawings.

[0049] Refer to Figure 1 as shown Figure 1 is a system schematic diagram of the air conditioning system provided by the embodiments of the present application.

[0050] In some embodiments, the air conditioning system includes an outdoor heat exchanger and an indoor heat exchanger 110. The outdoor heat exchanger includes a first heat exchanger 120 and a second heat exchanger 130. The first heat exchanger 120 is located below the second heat exchanger 130. The air conditioning system further includes a valve assembly for outputting a part of the refrigerant output from the exhaust port of the compressor 300 to the first heat exchanger 120 or the second heat exchanger 130 under defrosting conditions to realize defrosting of the first heat exchanger 120 or the second heat exchanger 130, and outputting another part of the refrigerant to the indoor heat exchanger 110, so that the refrigerant releases heat in the indoor heat exchanger 110, so that the indoor temperature rises, realizing defrosting of the first heat exchanger 120 or the second heat exchanger 130 while heating the indoor space.

[0051] In some embodiments, the valve assembly includes a first valve 210, a second valve 220 and a pipeline switching valve 230. The exhaust port of the compressor 300 is connected to the first heat exchanger 120 and the second heat exchanger 130 through the indoor heat exchanger 110 respectively to be able to transfer the refrigerant to the first heat exchanger 120 or the second heat exchanger 130. The first heat exchanger 120 is connected to the intake port of the compressor 300 through the first valve 210, and the second heat exchanger 130 is connected to the intake port of the compressor 300 through the second valve 220, so as to be able to change the flow direction of the refrigerant in the air conditioning system.

[0052] It should be noted that the first end of the pipeline switching valve 230 is connected to the pipeline between the exhaust port of the compressor 300 and the indoor heat exchanger 110, so as to control the flow or cut-off of the refrigerant between the compressor 300 and the indoor heat exchanger 110. The second end of the pipeline switching valve 230 is connected to the pipeline between the first valve 210 and the first heat exchanger 120, so as to control the flow or cut-off of the refrigerant between the compressor 300 and the first heat exchanger 120. The third end of the pipeline switching valve 230 is connected to the pipeline between the second valve 220 and the second heat exchanger 130, so as to control the flow or cut-off of the refrigerant between the compressor 300 and the second heat exchanger 130, and further change the flow direction of the refrigerant in the air-conditioning system.

[0053] In some embodiments, the valve assembly further includes a stop valve 240. The first end of the pipeline switching valve 230 is connected to the pipeline between the exhaust port of the compressor 300 and the indoor heat exchanger 110 through the stop valve, so as to be able to open or close the first end, the second end and the third end of the pipeline switching valve 230 simultaneously, and achieve full closing or full opening of the ports of the pipeline switching valve 230.

[0054] In some embodiments, the air-conditioning system further includes a first throttle valve 410 and a second throttle valve 420. One end of the indoor heat exchanger 110 is connected to one end of the first throttle valve 410, and the other end of the first throttle valve 410 is connected to the first heat exchanger 120 and the second heat exchanger 130 respectively through a shunt pipe. The first heat exchanger 120 is connected in series with the second throttle valve 420, so as to control the flow rate of the refrigerant and ensure the normal operation of the air-conditioning system.

[0055] It can be understood that adding the second throttle valve 420 to the refrigerant flow path can solve the problem that a large amount of high-temperature and high-pressure gas enters the second heat exchanger 130 during the hot gas bypass defrosting process, and there is a large amount of liquid refrigerant after the defrosting ends, which affects the service life of the compressor 300. In addition, by controlling the opening degrees of the first throttle valve 410 and the second throttle valve 420, the flow rate of the refrigerant can be accurately controlled to ensure that the refrigerant in the air-conditioning system is appropriate, achieve precise adjustment and control of the indoor temperature, and accelerate the defrosting efficiency of the first heat exchanger 120 and the second heat exchanger 130 by restricting the flow rate of the refrigerant.

[0056] In some embodiments, the air conditioning system further includes a four-way valve 500 and a gas-liquid separator 600. The four-way valve 500 is used to control the flow direction of the refrigerant. The output end of the gas-liquid separator 600 is connected to the intake port of the compressor 300. Among them, the first valve port of the four-way valve 500 is connected to the exhaust port of the compressor 300, the second valve port is connected to the input end of the gas-liquid separator 600, the third valve port is connected to the first heat exchanger 120, and the fourth valve port is respectively connected to the first valve 210 and the second valve 220 to achieve the change of the refrigerant flow direction.

[0057] During the heating process of the air conditioner system, the compressor 300 discharges high-temperature and high-pressure refrigerant. The flow direction of the refrigerant is changed through the four-way valve 500 and the valve assembly, so that the refrigerant enters the indoor heat exchanger 110 to release heat, realizing the increase of the indoor environmental temperature. Then, it flows into the first heat exchanger 120 and the second heat exchanger 130 through the first throttle valve 410 and the second throttle valve 420, and finally flows into the four-way valve 500 through the first valve 210 and the second valve 220, and enters the gas-liquid separator 600. The gas-liquid separator 600 then transmits the processed refrigerant into the compressor 300 to complete the heating process of the air conditioning system, further realizing the heating of the room.

[0058] Those skilled in the art can understand that Figure 1 the schematic diagrams shown in

[0059] do not constitute a limitation to the embodiments of the present application. It may include more or fewer components than shown in the figures, or combine certain components, or have different component arrangements. The defrosting control method in this embodiment will be specifically described below. Figure 2 As shown in Figure 2 is a flowchart of a defrosting control method provided by an embodiment of the present application. Applied but not limited to Figure 1 the air conditioning system in

[0060] Step S101, when it is necessary to defrost the first heat exchanger 120 and the second heat exchanger 130, control the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor 300 to the first heat exchanger 120 to defrost the first heat exchanger 120;

[0061] In some embodiments, when it is necessary to defrost the first heat exchanger 120 and the second heat exchanger 130, first, control the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor 300 to the first heat exchanger 120, so that the refrigerant releases heat in the first heat exchanger 120, and the first heat exchanger 120 can be defrosted.

[0062] It should be noted that during the process of outputting a part of the refrigerant output from the exhaust port of the compressor 300 to the first heat exchanger 120, another part of the refrigerant will also be output to the indoor heat exchanger 110 to achieve heating of the room. Specific descriptions will be given below.

[0063] Step S102, after defrosting the first heat exchanger 120, control the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor 300 to the second heat exchanger 130 to defrost the second heat exchanger 130.

[0064] In some embodiments, after defrosting the first heat exchanger 120, start defrosting the second heat exchanger 130. Control the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor 300 to the second heat exchanger 130, so that the refrigerant releases heat in the first heat exchanger 120, and the second heat exchanger 130 can be defrosted.

[0065] It should be noted that during the process of outputting a part of the refrigerant output from the exhaust port of the compressor 300 to the second heat exchanger 130, another part of the refrigerant will also be output to the indoor heat exchanger 110 to achieve heating of the room. Specific descriptions will be given below.

[0066] Step S103, after defrosting the second heat exchanger 130, control the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor 300 to the first heat exchanger 120 to defrost the first heat exchanger 120.

[0067] In some embodiments, since the first heat exchanger 120 is arranged below the second heat exchanger 130, after the second heat exchanger 130 is defrosted, it may occur that the defrosting water droplets of the second heat exchanger 130 drip onto the first heat exchanger 120 and refreeze, further affecting the stability of the operation of the air-conditioning system. Therefore, in this embodiment, it is also necessary to control the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor 300 to the first heat exchanger 120 to defrost the first heat exchanger 120 again, so as to avoid the influence of the water droplets after defrosting of the second heat exchanger 130, improve the defrosting efficiency of the first heat exchanger 120, ensure the defrosting reliability, and further improve the stability of the air-conditioning system.

[0068] Step S104, after defrosting the first heat exchanger 120, end the defrosting.

[0069] In some embodiments, after defrosting the first heat exchanger 120, complete the defrosting process of the first heat exchanger 120 and the second heat exchanger 130, and end the defrosting to improve the stability of the air-conditioning system.

[0070] In the embodiment of the present application, the defrosting of the first heat exchanger 120 is controlled first to prevent the second heat exchanger 130 from defrosting first in a low-temperature situation. The defrosting water flows along the fins and flows downstream to the first heat exchanger 120 below, resulting in the fusion of the frost on the fins of the first heat exchanger 120 and the defrosting water dripping from the fins of the second heat exchanger 130, which condenses into ice, causing the problem that the frost on the first heat exchanger 120 is more difficult to melt. Therefore, in this embodiment, the first heat exchanger 120 is defrosted first, and then the second heat exchanger 130 is defrosted. After the defrosting of the second heat exchanger 130 is completed, the first heat exchanger 120 is defrosted for the second time, avoiding the situation where after the defrosting of the second heat exchanger 130, the defrosting water drips onto the first heat exchanger 120 and the first heat exchanger 120 freezes at a temperature below zero, improving the heat exchange capacity of the first heat exchanger 120, and at the same time solving the problem of incomplete defrosting of the heat exchanger located below, ensuring the reliability of defrosting.

[0071] It should be noted that during the defrosting process of the first heat exchanger 120 and the second heat exchanger 130, the high-temperature and high-pressure refrigerant output by the compressor 300 will also pass through the indoor heat exchanger 110 and release heat in the indoor heat exchanger 110, so that the first heat exchanger 120 and the second heat exchanger 130 can be defrosted while heating the indoor environment, ensuring the smooth flow of the refrigerant, maintaining the stable operation of the air-conditioning system, and improving the performance and efficiency of the air-conditioning system.

[0072] In some embodiments, before defrosting the first heat exchanger 120 and the second heat exchanger 130, the state of the air-conditioning system needs to be judged in this embodiment to determine whether the first heat exchanger 120 and the second heat exchanger 130 meet the defrosting conditions. Among them, the defrosting conditions can be that when the air-conditioning system reaches the set defrosting time, the defrosting of the first heat exchanger 120 and the second heat exchanger 130 starts, or when the pipe temperature of the first heat exchanger 120 and the pipe temperature of the second heat exchanger 130 reach the set temperature, the defrosting of the first heat exchanger 120 and the second heat exchanger 130 starts. This embodiment does not make specific limitations.

[0073] Taking the pipe temperature of the first heat exchanger 120 and the pipe temperature of the second heat exchanger 130 reaching the set temperature as an example, when the pipe temperatures of both the first heat exchanger 120 and the second heat exchanger 130 are less than the preset pipe temperature, and the heating duration of the indoor heat exchanger 110 reaches the preset heating duration, it is determined that the first heat exchanger 120 and the second heat exchanger 130 meet the defrosting conditions, and the defrosting operation needs to be performed on the first heat exchanger 120 and the second heat exchanger 130. If the pipe temperature of the first heat exchanger 120 or the second heat exchanger 130 is greater than or equal to the preset pipe temperature, the defrosting conditions are not met, and the temperatures of the first heat exchange pipe and the second heat exchange pipe continue to be detected.

[0074] It should be noted that the preset pipe temperature and the preset heating duration in this embodiment can be set according to experimental data. Among them, the pipe temperature of the first heat exchanger 120 and the pipe temperature of the second heat exchanger 130 can be detected by a temperature sensing bulb, and no specific limitation is made in this embodiment.

[0075] In some embodiments, after defrosting is completed, the operation is performed according to the set heating mode, and the judgment cycle for the next defrosting is entered. That is, the judgment for entering the next defrosting is performed after a preset duration, where the preset duration can be set by the user according to needs, for example, twenty minutes, thirty minutes, forty minutes, etc., and no specific limitation is made in this embodiment.

[0076] Refer to Figure 3 as shown in Figure 3 is a flowchart of outputting a part of the refrigerant output from the exhaust port of the compressor 300 to the first heat exchanger 120 provided in an embodiment of the present application. It includes but is not limited to step S201.

[0077] Step S201, open the stop valve, control the pipeline switching valve 230 to connect the first end and the second end, close the first valve 210, and open the second valve 220.

[0078] In some embodiments, during the process of controlling the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor 300 to the first heat exchanger 120, open the stop valve so that all three ends of the switching valve can be connected, control the pipeline switching valve 230 to connect the first end and the second end, so that the refrigerant flows from the first end of the pipeline switching valve 230 to the second end, and then flows out from the second end. Among them, a part of the refrigerant flows from the second end to the refrigerant flow path between the first valve 210 and the first heat exchanger 120, and another part of the refrigerant flows to the indoor heat exchanger 110 to release heat in the indoor heat exchanger 110, and close the first valve 210, so that the refrigerant flowing out from the second end flows to the first heat exchanger 120, and can release heat in the first heat exchanger 120 to increase the temperature of the first heat exchanger 120 to defrost the first heat exchanger 120, open the second valve 220, so that the refrigerant flowing through the indoor heat exchanger 110 and the first heat exchanger 120 can flow out from the second valve 220, realizing defrosting of the first heat exchanger 120 while heating the room, and at the same time avoiding the problem of refrigerant residue and extending the service life of the air conditioning system.

[0079] Refer to Figure 4 as shown in Figure 4 is Figure 2 a flowchart of the specific method for step S102 in

[0080] Step S301, open the stop valve, control the pipeline switching valve 230 to connect the first end and the third end, close the second valve 220, and open the first valve 210.

[0081] In some embodiments, during the process that the control valve assembly outputs a part of the refrigerant output from the exhaust port of the compressor 300 to the second heat exchanger 130, the shut-off valve is opened so that all three ports of the switching valve can be communicated. The pipeline switching valve 230 is controlled to communicate the first port and the third port, so that the refrigerant flows from the first port of the pipeline switching valve 230 to the third port and then flows out from the third port. Among them, a part of the refrigerant flows out from the third port and flows to the refrigerant flow path between the second heat exchanger 130 and the second valve 220, and another part of the refrigerant flows to the indoor heat exchanger 110 to release heat in the indoor heat exchanger 110. The second valve 220 is closed so that the refrigerant flowing out from the third port flows to the second heat exchanger 130, and heat can be released in the second heat exchanger 130, and the temperature of the second heat exchanger 130 is increased to defrost the second heat exchanger 130. The first valve 210 is opened so that the refrigerant flowing through the indoor heat exchanger 110 and the second heat exchanger 130 can flow out from the first valve 210, realizing defrosting of the second heat exchanger 130 while heating the room, avoiding the problem of refrigerant residue, and prolonging the service life of the air-conditioning system.

[0082] Refer to Figure 5 as shown in Figure 5 is a flowchart of a defrost control method provided by another embodiment of the present application. The method includes but is not limited to steps S401 to step S402.

[0083] Step S401, in the heating mode, control the opening degree of the first throttle valve 410 according to the exhaust temperature of the compressor 300, and control the second throttle valve 420 to the maximum opening degree;

[0084] In some embodiments, in the heating mode, control the opening degree of the first throttle valve 410 according to the exhaust temperature of the compressor 300, and control the second throttle valve 420 to the maximum opening degree, that is, control the opening degree of the second throttle valve 420 to the fully open state, so as to be able to control the refrigerant flow rate, further control the heating efficiency of the indoor heat exchanger 110, the first heat exchanger 120 and the second heat exchanger 130, and thus improve the heating capacity of the entire air-conditioning system.

[0085] It can be understood that by controlling the opening degree of the first throttle valve 410 according to the exhaust temperature of the compressor 300, the flow rate and pressure of the refrigerant in the refrigerant flow path can be ensured, thereby reducing energy loss and improving the energy efficiency of the air-conditioning system.

[0086] Step S402, in the defrost mode, control the opening degree of the first throttle valve 410 according to the exhaust temperature of the compressor 300, and control the opening degree of the second throttle valve 420 to a preset opening degree.

[0087] It should be noted that the size of the preset opening degree corresponds to the heat exchanger currently being defrosted and is greater than the maximum opening degree of the first throttle valve 410.

[0088] In some embodiments, in the defrosting condition, the opening degree of the first throttle valve 410 is controlled according to the exhaust temperature of the compressor 300, the opening degree of the second throttle valve 420 is controlled to be a preset opening degree, the refrigerant flow rate is increased, and the heating efficiency of the indoor heat exchanger 110, the first heat exchanger 120, and the second heat exchanger 130 is improved, further improving the defrosting efficiency of the air conditioning system.

[0089] It should be noted that, in the defrosting condition, the preset opening degree can be preset according to experimental data. Among them, the value range of the preset opening degree is from 100P to 200P, such as 100P, 110P, 190P, etc. When defrosting the first heat exchanger 120, the preset opening degree in this embodiment is 130P; when defrosting the second heat exchanger 130, the preset opening degree in this embodiment is 150P.

[0090] In some embodiments, in the defrosting mode, at least one of the following is further performed:

[0091] Adjust the blower of the indoor heat exchanger 110 to a first preset speed;

[0092] Adjust the blower of the outdoor heat exchanger to a second preset speed;

[0093] Control the operating frequency of the compressor 300 to be a preset frequency.

[0094] By adjusting the rotational speed of the blower of the indoor heat exchanger 110, the rotational speed of the blower of the outdoor heat exchanger, and the operating frequency of the compressor 300, the defrosting efficiency and the heating efficiency of the air conditioning system are improved, thereby improving the heating capacity of the entire air conditioning system.

[0095] It should be noted that the first preset speed is the low gear speed of the blower of the indoor heat exchanger 110. Among them, the first preset speed, the second preset speed, and the preset frequency are all set according to experimental data.

[0096] It is worth noting that the value range of the first preset speed is within the speed range corresponding to the low gear speed. Among them, the speed range of the low gear speed includes the speed ranges corresponding to the silent gear, the gentle breeze gear, and the low wind gear. The value range of the second preset speed is between 40% and 80% of the maximum speed of the outdoor heat exchanger. The value range of the first preset frequency is from 50Hz to 100Hz. In this embodiment, the first preset speed is the speed corresponding to the gentle breeze gear, the second preset speed is 60% of the maximum speed of the outdoor blower, and the first preset frequency is 85Hz. In this embodiment, in order to accelerate the defrosting speed, the rotational speed of the indoor blower is adjusted to the first preset speed, the rotational speed of the outdoor blower is adjusted to the second preset speed, and the operating frequency of the compressor 300 is adjusted to the first preset frequency simultaneously.

[0097] Refer to Figure 6As shown Figure 6 is a flowchart of a defrosting control method provided by another embodiment of the present application. It includes but is not limited to steps S501 to S502.

[0098] Step S501, during the defrosting process of the first heat exchanger 120, when the defrosting duration of the first heat exchanger 120 reaches the first duration or the refrigerant outlet temperature of the first heat exchanger 120 is greater than the first temperature threshold, end the defrosting of the first heat exchanger 120;

[0099] Step S502, during the defrosting process of the second heat exchanger 130, when the defrosting duration of the second heat exchanger 130 reaches the second duration or the refrigerant outlet temperature of the second heat exchanger 130 is greater than the second temperature threshold, end the defrosting of the second heat exchanger 130.

[0100] In steps S501 to S502 of some embodiments, during the defrosting process of the first heat exchanger 120, when the defrosting duration of the first heat exchanger 120 reaches the first duration or the refrigerant outlet temperature of the first heat exchanger 120 is greater than the first temperature threshold, end the defrosting of the first heat exchanger 120. At this time, the refrigerant flows out from the second valve 220 and flows to the intake port of the compressor 300; during the defrosting process of the second heat exchanger 130, when the defrosting duration of the second heat exchanger 130 reaches the second duration or the refrigerant outlet temperature of the second heat exchanger 130 is greater than the second temperature threshold, end the defrosting of the second heat exchanger 130. At this time, the refrigerant flows out from the first valve 210 and flows to the intake port of the compressor 300 to complete the defrosting of the first heat exchanger 120 and the second heat exchanger 130.

[0101] It should be noted that the first duration, the first temperature threshold, the second duration, and the second temperature threshold are all set according to experimental data. Among them, the value ranges of the first duration and the second duration are both between 30 seconds and 120 seconds, and the value ranges of the first temperature threshold and the second temperature threshold are both between -2 degrees Celsius and 15 degrees Celsius. In this embodiment, the first duration is 60 seconds, the first temperature threshold is 7 degrees Celsius, the second duration is 70 seconds, and the second temperature threshold is 8 degrees Celsius. This embodiment does not make specific limitations on the first duration, the first temperature threshold, the second duration, and the second temperature threshold.

[0102] In order to more clearly and understandably explain the above-mentioned defrosting control method, controller, and air-conditioning system of the air-conditioning system, the following is illustrated with specific examples.

[0103] Example 1:

[0104] Example 1 is a specific description of the defrosting control method of the air-conditioning system. The following is based on the structure of the air-conditioning system in Figure 1 to explain the defrosting control method in detail.

[0105] Referring to Figure 7 , Figure 7 which is a schematic diagram of the refrigerant flow direction of the air conditioning system provided by an example of the present application.

[0106] In some embodiments, during the operation of the air conditioner, due to the large temperature difference between the heat exchanger itself and the ambient temperature, the outdoor heat exchanger is prone to frosting. This phenomenon causes the overall performance of the air conditioner to deteriorate. Therefore, it is necessary to defrost the outdoor heat exchanger periodically. Currently, the traditional defrosting methods, reverse cycle (converting the four-way valve 500 to refrigeration) or shutdown defrosting, will cause the indoor temperature to drop and affect the user's comfort.

[0107] In this embodiment, two outdoor heat exchangers are provided to solve the problem of indoor temperature drop during the traditional defrosting process. Moreover, the first heat exchanger 120 and the second heat exchanger 130 of the outdoor heat exchanger can be defrosted separately, enabling defrosting while heating the indoor environment and ensuring the reliability of defrosting.

[0108] During the defrosting process of the first heat exchanger 120, the refrigerant is discharged from the compressor 300, flows out through the four-way valve 500. The stop valve is opened, the pipeline switching valve 230 is controlled to connect the first end and the second end, the first valve 210 is closed, and the second valve 220 is opened. At this time, a part of the refrigerant flows to the indoor heat exchanger 110 to release heat for indoor heating, then flows through the first throttle valve 410 and the second heat exchanger 130, flows from the second valve 220 to the four-way valve 500, and finally flows into the compressor 300;

[0109] Another part of the refrigerant flows into the first end of the pipeline switching valve 230 through the stop valve, then flows from the second end to the first heat exchanger 120, and releases heat in the first heat exchanger 120 to defrost the first heat exchanger 120. After that, the refrigerant flows from the first heat exchanger 120 into the second throttle valve 420 and the second heat exchanger 130 in sequence, and finally flows into the compressor 300 through the second valve 220 to complete the defrosting process of the first heat exchanger 120.

[0110] During the defrosting process of the second heat exchanger 130, the refrigerant is discharged from the compressor 300, flows out through the four-way valve 500. The stop valve is opened, the pipeline switching valve 230 is controlled to connect the first end and the third end, the second valve 220 is closed, and the first valve 210 is opened. At this time, a part of the refrigerant flows to the indoor heat exchanger 110 to release heat for indoor heating, then flows through the first throttle valve 410 and the first heat exchanger 120, flows from the first valve 210 to the four-way valve 500, and finally flows into the compressor 300;

[0111] Another part of the refrigerant flows into the first end of the pipeline switching valve 230 through the stop valve, then flows from the third end to the second heat exchanger 130, and releases heat in the second heat exchanger 130 to defrost the second heat exchanger 130. After that, the refrigerant flows from the second heat exchanger 130 into the second throttle valve 420 and the first heat exchanger 120 in sequence, and finally flows into the compressor 300 through the first valve 210 to complete the defrosting process of the second heat exchanger 130.

[0112] It should be noted that Figure 7 The solid line in indicates the refrigerant flow direction during the defrosting of the first heat exchanger 120, and the dashed line indicates the refrigerant flow direction during the defrosting of the second heat exchanger 130.

[0113] This embodiment can solve the problem of the indoor temperature drop during the traditional defrosting process, and adding a second throttle valve 420 in the refrigerant pipeline can solve the problem of a large amount of high-temperature and high-pressure gas entering the outdoor heat exchanger during the hot gas bypass defrosting process, avoiding the existence of a large amount of liquid refrigerant after defrosting, which affects the service life of the compressor 300.

[0114] Example 2:

[0115] Example 2 is a specific description of the defrosting control method for the air conditioning system. Based on the structure of the air conditioning system in below, the defrosting control method will be described in detail. Figure 1 The structure of the air conditioning system in is used as the basis to describe the defrosting control method in detail.

[0116] In some embodiments, when the series-parallel defrosting control method is working, first control the air conditioning system to enter the heating mode. When heating operation is required, the user can send a heating mode control command to the air conditioner through a controller such as a remote control or a control panel, and the air conditioner performs heating operation according to the set parameters.

[0117] After entering the heating mode, determine whether the conditions for entering defrosting are met. During heating operation, the heat exchanger of the outdoor unit is prone to frosting, which leads to a decrease in the heating performance of the air conditioner. Therefore, it is necessary to judge the operating state of the air conditioner to confirm whether the heat exchanger is frosted and whether it has reached the state where defrosting is required.

[0118] Among them, the conditions for entering defrosting include: the pipe temperatures of the first heat exchanger 120 and the second heat exchanger 130 are less than the preset pipe temperature, and the heating operation of the air conditioning system reaches the preset duration. The preset temperature and preset duration can be set in advance according to experimental data.

[0119] The pipe temperatures of the first heat exchanger 120 and the second heat exchanger 130 are detected through temperature sensors. When the pipe temperatures of both the first heat exchanger 120 and the second heat exchanger 130 are less than the preset pipe temperature and the heating operation of the air conditioning system reaches the preset duration, it means that both the first heat exchanger 120 and the second heat exchanger 130 are in the state of frosting and requiring defrosting.

[0120] If the conditions for entering defrosting are not met, heating continues. If the conditions for entering defrosting are met, the cut-off valve is controlled to open.

[0121] The second heat exchanger 130 is located above the first heat exchanger 120. Therefore, the steps of defrosting one by one include: after controlling the first heat exchanger 120 to complete defrosting, then controlling the second heat exchanger 130 to defrost, and finally defrosting the first heat exchanger 120 again. Since the second heat exchanger 130 is located above the first heat exchanger 120, controlling the first heat exchanger 120 to defrost first can prevent the second heat exchanger 130 from defrosting first in low-temperature situations, resulting in defrosting water flowing down along the fins, causing the frost on the fins of the first heat exchanger 120 to merge with the defrosting water on the fins of the second heat exchanger 130 and condensing into ice, which is more difficult to melt. In this embodiment, the first heat exchanger 120 is defrosted twice, so as to avoid the problem that during the defrosting process of the second heat exchanger 130, the defrosting water drops onto the first heat exchanger 120 and refreezes, affecting the operation of the air-conditioning system.

[0122] First, the first heat exchanger 120 is defrosted for the first time, and the specific process is as follows:

[0123] When defrosting the first heat exchanger 120, the opening degree of the first throttle valve 410 is adjusted to the corresponding valve opening according to the exhaust temperature of the compressor 300, and the opening degree of the second throttle valve 420 is adjusted from the fully open state to the first preset opening degree, and the first preset opening degree is greater than the maximum opening degree of the first throttle valve 410. The pipeline switching valve 230 connects the first end and the second end, the first end is connected to the cut-off valve, the second end is connected to the first valve 210. When the first heat exchanger 120 is defrosting, the cut-off valve is fully closed when powered on and fully open when not powered on, the first valve 210 is powered on, and the second valve 220 and the cut-off valve are not powered on.

[0124] Among them, the first preset opening degree is pre-set according to experimental data, and the value range of the first preset opening degree is 100P to 200P. The first preset opening degree in this embodiment is 130P.

[0125] It should be noted that the third end of the pipeline switching valve 230 is connected to the second valve 220. The pipeline switching valve 230 includes a powered-on state and a powered-off state: when the pipeline switching valve 230 is in the powered-on state, the first end and the second end are connected, and the first end and the third end are disconnected; when the pipeline switching valve 230 is in the powered-off state, the first end and the third end are connected, and the first end and the second end are disconnected.

[0126] During the process of defrosting the first heat exchanger 120, it also includes: adjusting the rotational speed of the indoor fan to the first preset rotational speed; and / or adjusting the rotational speed of the outdoor fan to the second preset rotational speed; and / or adjusting the operating frequency of the compressor 300 to the first preset frequency.

[0127] Among them, the first preset speed, the second preset speed, and the first preset frequency are preset according to experimental data. The value range of the first preset speed is within the speed ranges corresponding to the silent gear, the gentle breeze gear, and the low wind gear. The value range of the second preset speed is from 40% to 80% of the maximum speed of the outdoor fan. The value range of the first preset frequency is from 50 Hz to 100 Hz. Preferably, the first preset speed is the speed corresponding to the gentle breeze gear, the second preset speed is 60% of the maximum speed of the outdoor fan, and the first preset frequency is 85 Hz.

[0128] In this embodiment, in order to accelerate the defrosting speed, at the same time, the speed of the indoor fan is adjusted to the first preset speed, the speed of the outdoor fan is adjusted to the second preset speed, and the operating frequency of the compressor 300 is adjusted to the first preset frequency.

[0129] After defrosting the first heat exchanger 120, it is also necessary to exit the defrosting mode. Specifically, the duration of controlling the defrosting of the first heat exchanger 120 is the first preset duration, and the sensor temperature for exiting the defrosting mode is the first preset temperature.

[0130] It can be understood that the first preset duration is preset according to experimental data, and the value range of the first preset duration is from 30 seconds to 120 seconds. The longest first preset duration in this embodiment is 60 seconds; the first preset temperature is preset according to experimental data, and the value range of the first preset temperature is from -2°C to +15°C. The first preset temperature in this embodiment is +7°C; the one with the shortest time is taken as the exit condition.

[0131] After that, the second heat exchanger 130 is defrosted, and the specific process is as follows:

[0132] When defrosting the second heat exchanger 130, the opening degree of the first throttle valve 410 is adjusted correspondingly according to the current exhaust temperature, and the opening degree of the second throttle valve 420 is adjusted to the second preset opening degree, and the second preset opening degree is greater than the maximum opening degree of the first throttling device.

[0133] When defrosting the second heat exchanger 130, the first end and the third end of the pipeline switching valve 230 are connected. The first end is connected to the stop valve, the second end is connected to the first valve 210, and the third end is connected to the second valve 220. The pipeline switching valve 230 includes an energized state and a de-energized state: when the solenoid valve is in the energized state, the first end and the second end are connected, and the first end and the third end are disconnected; when the solenoid valve is in the de-energized state, the first end and the third end are connected, and the first end and the second end are disconnected.

[0134] Among them, the second preset opening degree is preset according to experimental data, and the value range of the second preset opening degree is from 100P to 200P. Preferably, the second preset opening degree is 150P.

[0135] During the defrosting process of the second heat exchanger 130, the rotational speed of the indoor fan is adjusted to a third preset rotational speed; and / or the rotational speed of the outdoor fan is adjusted to a fourth preset rotational speed; and / or the operating frequency of the compressor 300 is adjusted to a second preset frequency. Among them, the third preset rotational speed, the fourth preset rotational speed, and the second preset frequency are preset according to experimental data. The value range of the third preset rotational speed is within the rotational speed ranges corresponding to the silent gear, the gentle breeze gear, and the low wind gear. The value range of the fourth preset rotational speed is 40% to 80% of the maximum rotational speed of the outdoor fan. The value range of the second preset frequency is 50 Hz to 100 Hz. Preferably, the third preset rotational speed is the rotational speed corresponding to the gentle breeze gear, the fourth preset rotational speed is 60% of the maximum rotational speed of the outdoor fan, and the second preset frequency is 85 Hz. In this embodiment, in order to accelerate the defrosting speed, the rotational speed of the indoor fan is simultaneously adjusted to the third preset rotational speed, the rotational speed of the outdoor fan is adjusted to the fourth preset rotational speed, and the operating frequency of the compressor 300 is adjusted to the second preset frequency.

[0136] It should be noted that when defrosting the second heat exchanger 130, the defrosting duration of the second heat exchanger 130 is controlled to be a second preset duration, the defrosting temperature at which the second heat exchanger 130 enters is controlled to be a second preset temperature, and the sensor temperature for exiting the defrosting mode is controlled to be a third preset temperature. Among them, the second preset duration is preset according to experimental data. The value range of the second preset duration is 30 seconds to 120 seconds. Preferably, the maximum of the second preset duration is 70 seconds. The second preset temperature is preset according to experimental data, and the second preset temperature is the first preset exit temperature. The value range of the third preset temperature is -2°C to +15°C. Preferably, the fourth preset temperature is +8°C. The shorter of the two is taken as the exit condition.

[0137] After the defrosting of the second heat exchanger 130, the defrosting water flows down along the evaporator fins, resulting in ice accumulation on the heat exchange fins of the first heat exchanger 120, and an additional defrosting step for the first heat exchanger 120 is added.

[0138] Finally, the first heat exchanger 120 is defrosted for the second time, and the specific process is as follows:

[0139] When defrosting the first heat exchanger 120, the opening degree of the first throttle valve 410 is adjusted to the corresponding valve opening degree according to the exhaust temperature, and the opening degree of the second throttle valve 420 is adjusted from the second preset opening degree state to the third preset opening degree, and the third preset opening degree is greater than the maximum opening degree of the first throttle valve 410. When the first heat exchanger 120 is defrosted, the direction of the pipeline switching valve 230 is switched, the first end and the second end are connected, the first end is connected to the stop valve, the second end is connected to the first valve 210, and the third end is connected to the second valve 220.

[0140] Among them, the third preset opening degree is preset according to experimental data. The value range of the third preset opening degree is 100P to 200P. Preferably, the first preset opening degree is 130P.

[0141] During the defrosting process of the first heat exchanger 120, the solenoid valve is fully closed when energized and fully open when de-energized. The first valve 210 is energized, and the second valve 220 and the stop valve are de-energized. The rotational speed of the indoor fan is adjusted to the first preset rotational speed; and / or the rotational speed of the outdoor fan is adjusted to the second preset rotational speed; and / or the operating frequency of the compressor 300 is adjusted to the first preset frequency. Among them, the first preset rotational speed, the second preset rotational speed, and the first preset frequency are preset according to experimental data. The value range of the first preset rotational speed is within the rotational speed ranges corresponding to the silent gear, the gentle breeze gear, and the low wind gear. The value range of the second preset rotational speed is 40% to 80% of the maximum rotational speed of the outdoor fan. The value range of the first preset frequency is 50 Hz to 100 Hz. Preferably, the first preset rotational speed is the rotational speed corresponding to the gentle breeze gear, the second preset rotational speed is 60% of the maximum rotational speed of the outdoor fan, and the first preset frequency is 85 Hz.

[0142] In order to accelerate the defrosting speed, simultaneously adjust the rotational speed of the indoor fan to the first preset rotational speed, the rotational speed of the outdoor fan to the second preset rotational speed, and the operating frequency of the compressor 300 to the first preset frequency.

[0143] It should be noted that when defrosting the first heat exchanger 120, the defrosting duration of the first heat exchanger 120 is controlled to be the third preset duration, the temperature for the control sensor to enter the defrosting state is the fourth preset temperature, and the temperature for the control sensor to exit the defrosting mode is the fifth preset temperature. The third preset duration is preset according to experimental data. The value range of the third preset duration is 30 seconds to 120 seconds. Preferably, the maximum of the first preset duration is 90 seconds. The fourth preset temperature is set according to the third preset temperature. The value range of the fifth preset temperature is -2°C to +15°C. Preferably, the second preset temperature is +7°C. The one with the shorter time is taken as the exit condition.

[0144] After defrosting the second heat exchanger 130 and the first heat exchanger 120, the defrosting is exited. After completing the second defrosting of the first heat exchanger 120, it is considered that the defrosting is completed. Therefore, the defrosting step is exited, and the operation is carried out according to the set heating mode, and the judgment cycle for the next defrosting is entered.

[0145] It is worth noting that after exiting the defrosting process, it is necessary to wait for the fourth preset duration before making a judgment on entering the next defrosting. The value range of the fourth preset duration is 20 minutes to 45 minutes. Preferably, the fourth preset duration is 35 minutes.

[0146] In some embodiments, after the serial-parallel defrost control method provided in this example meets the conditions for entering defrost, by defrosting the first heat exchanger 120 and the second heat exchanger 130 one by one and then throttling, it can ensure that while one heat exchanger is defrosting, the other heat exchanger is still in the heating operation state, so that the indoor temperature can be maintained while defrosting. At the same time, after defrosting, the refrigerant enters another heat exchanger in the heating operation state through the throttle valve, which can depressurize and cool the refrigerant, facilitating the heat exchange of the refrigerant under low-temperature conditions, converting the liquid refrigerant into a gaseous state, preventing liquid hammering of the compressor 300, and extending the service life of the compressor 300.

[0147] As Figure 8 shown, Figure 8 is a schematic diagram of the controller 1000 provided by an embodiment of the present application.

[0148] The controller 1000 of the embodiment of the present application includes one or more processors 1001 and a memory 1002. Figure 8 Here, one processor 1001 and one memory 1002 are taken as examples.

[0149] The processor 1001 and the memory 1002 can be connected through a bus or other means. Figure 8 Here, connection through a bus is taken as an example.

[0150] As a non-transitory computer-readable storage medium, the memory 1002 can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 1002 can include high-speed random access memory, and can also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 1002 optionally includes a memory 1002 remotely set relative to the processor 1001, and these remote memories can be connected to the controller 1000 through a network. Examples of the above-mentioned network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0151] Those skilled in the art can understand that Figure 8 the device structure shown in

[0152] As a non-transitory computer-readable storage medium, the memory can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory may optionally include memories remotely disposed relative to the processor, and these remote memories can be connected to the processor through a network. Examples of the above networks include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0153] The non-transitory software programs and instructions required to implement the defrost control method of the air-conditioning system in the above embodiments are stored in the memory, and when executed by the processor, they implement the above embodiments.

[0154] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place, or may be distributed to multiple network nodes. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0155] In addition, an embodiment of the present application also provides a computer-readable storage medium storing computer-executable instructions, which are executed by a processor or a controller 1000.

[0156] Those of ordinary skill in the art will understand that all or some of the steps and systems disclosed above can be implemented as software, firmware, hardware, and their appropriate combinations. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or can be implemented as hardware, or can be implemented as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically contains computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0157] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (one) of the following" or its similar expression refers to any combination of these items, including any combination of single item (one) or plural items (ones). For example, at least one (one) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0158] In several embodiments provided by the present application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of apparatuses or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0159] It should also be understood that the various embodiments provided by the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0160] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. A defrosting control method for an air conditioning system, characterized in that, the air conditioning system includes an outdoor heat exchanger and an indoor heat exchanger, the outdoor heat exchanger includes a first heat exchanger and a second heat exchanger, and the first heat exchanger is located below the second heat exchanger; the air conditioning system further includes a valve assembly for outputting a part of the refrigerant output from the exhaust port of the compressor to the first heat exchanger or the second heat exchanger and another part of the refrigerant to the indoor heat exchanger under defrosting conditions; the defrosting control method includes: when it is necessary to defrost the first heat exchanger and the second heat exchanger, controlling the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the first heat exchanger to defrost the first heat exchanger; after the defrosting of the first heat exchanger is completed, controlling the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the second heat exchanger to defrost the second heat exchanger; after the defrosting of the second heat exchanger is completed, controlling the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the first heat exchanger to defrost the first heat exchanger; after the defrosting of the first heat exchanger is completed, end the defrosting.

2. The defrosting control method according to claim 1, characterized in that, the valve assembly includes a first valve, a second valve and a pipeline switching valve, the exhaust port of the compressor is respectively connected to the first heat exchanger and the second heat exchanger through the indoor heat exchanger, the first heat exchanger is connected to the intake port of the compressor through the first valve, and the second heat exchanger is connected to the intake port of the compressor through the second valve; the first end of the pipeline switching valve is communicated with the pipeline between the exhaust port of the compressor and the indoor heat exchanger, the second end of the pipeline switching valve is communicated with the pipeline between the first valve and the first heat exchanger, and the third end of the pipeline switching valve is communicated with the pipeline between the second valve and the second heat exchanger.

3. The defrosting control method according to claim 2, characterized in that, the valve assembly further includes a stop valve, and the first end of the pipeline switching valve is communicated with the pipeline between the exhaust port of the compressor and the indoor heat exchanger through the stop valve.

4. The defrosting control method according to claim 3, characterized in that, the controlling the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the first heat exchanger includes: opening the stop valve, controlling the pipeline switching valve to communicate the first end and the second end, closing the first valve, and opening the second valve.

5. The defrosting control method according to claim 3, characterized in that, the controlling the valve assembly to output a part of the refrigerant output from the exhaust port of the compressor to the second heat exchanger includes: opening the stop valve, controlling the pipeline switching valve to communicate the first end and the third end, closing the second valve, and opening the first valve.

6. The defrosting control method according to claim 1, characterized in that, The air conditioning system further includes a first throttle valve and a second throttle valve. One end of the indoor heat exchanger is connected to the first throttle valve, and the other end of the first throttle valve is respectively connected to the first heat exchanger and the second heat exchanger through a shunt pipe. The first heat exchanger is connected in series with the second throttle valve; The defrosting control method further includes: Under the heating condition, the opening degree of the first throttle valve is controlled according to the exhaust temperature of the compressor, and the second throttle valve is controlled to be at the maximum opening degree; Under the defrosting condition, the opening degree of the first throttle valve is controlled according to the exhaust temperature of the compressor, and the opening degree of the second throttle valve is controlled to be a preset opening degree. The size of the preset opening degree corresponds to the heat exchanger being defrosted currently and is greater than the maximum opening degree of the first throttle valve.

7. The defrosting control method according to claim 1, wherein, The defrosting control method further includes: In the defrosting mode, at least one of the following is further executed: Adjust the blower of the indoor heat exchanger to a first preset speed; Adjust the blower of the outdoor heat exchanger to a second preset speed; Control the operating frequency of the compressor to be a preset frequency; The first preset speed is the low gear speed of the blower of the indoor heat exchanger.

8. The defrosting control method according to claim 1, wherein, The defrosting control method further includes: During the defrosting process of the first heat exchanger, when the defrosting duration of the first heat exchanger reaches a first duration or the refrigerant outlet temperature of the first heat exchanger is greater than a first temperature threshold, the defrosting of the first heat exchanger is ended; During the defrosting process of the second heat exchanger, when the defrosting duration of the second heat exchanger reaches a second duration or the refrigerant outlet temperature of the second heat exchanger is greater than a second temperature threshold, the defrosting of the second heat exchanger is ended.

9. A controller, wherein, It includes at least one processor and a memory for communicating with the at least one processor; The memory stores instructions that can be executed by the at least one processor. The instructions are executed by the at least one processor so that the at least one processor can execute the defrosting control method of the air conditioning system according to any one of claims 1 to 8.

10. An air conditioning system, wherein, It includes the controller according to claim 9.

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