Air conditioner defrosting control method and device, air conditioner, storage medium and program product

Abstract

The invention discloses an air conditioner defrosting control method and device, an air conditioner, a storage medium and a computer program product, the air conditioner defrosting control method is provided with a heat dissipation component for dissipating heat of a frequency converter, the first end of the heat dissipation component is connected to the first end of an outdoor heat exchanger through a first electromagnetic valve, and the first end of the heat dissipation component is further connected to the second end of the outdoor heat exchanger through a second electromagnetic valve; the second end of the radiating component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor; the method comprises the steps that opening and closing of a first electromagnetic valve and a second electromagnetic valve are controlled according to the outdoor environment temperature and the outdoor heat exchanger temperature during heating operation; controlling the air conditioner to switch to a refrigeration mode according to the temperature of the outdoor heat exchanger; and controlling the frequency of the compressor according to the current change rate and the exhaust pressure change rate of the compressor. According to the scheme, the outdoor heat exchanger is defrosted by using the heat generated by the frequency converter, so that the air conditioner defrosts while heating, and the situation that the user experience is affected due to the fact that indoor heating cannot be achieved is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and specifically relates to a control method and device for air conditioner defrosting, an air conditioner, a storage medium and a computer program product. Background Art

[0002] During the heating operation of the air conditioner, the temperature of the outdoor unit is low, and frost and snow are easily formed on the surface of the outdoor unit heat exchanger, thereby reducing the system performance, so the outdoor unit needs to be defrosted. The relevant solution directly controls the air conditioner to switch to cooling mode for defrosting when the outdoor unit needs to be defrosted, but the indoor heating cannot be performed during the defrosting period, which affects the user experience.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The object of the present invention is to provide a control method, device, air conditioner, storage medium and computer program product for defrosting an air conditioner, so as to solve the problem that in related schemes, when the air conditioner outdoor unit needs to be defrosted, the air conditioner is directly controlled to switch to the cooling mode for defrosting, and the indoor heating cannot be performed during the defrosting period, which affects the user experience. The heat generated by the inverter is used to defrost the outdoor heat exchanger, so that the air conditioner can defrost while heating, avoiding the indoor heating being unable to affect the user experience; and during the defrosting process in the cooling mode, the compressor frequency is controlled according to the current change rate and voltage change rate of the compressor, so as to ensure the stable operation of the air conditioner and improve the system efficiency.

[0005] The present invention provides a control method for defrosting an air conditioner, the air conditioner comprising an outdoor heat exchanger, a compressor, a throttling component, and a frequency converter; a heat dissipation component is arranged at the frequency converter, and the heat dissipation component is used to dissipate heat for the frequency converter; a first end of the heat dissipation component is connected to a first end of the outdoor heat exchanger through a first solenoid valve, the first end of the heat dissipation component is also connected to a second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor; the method comprises: when the air conditioner is running in a heating mode, The first solenoid valve is in a closed state and the second solenoid valve is in an open state, and the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor are obtained; the first solenoid valve is controlled to open and the second solenoid valve is controlled to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger; after opening the first solenoid valve and closing the second solenoid valve, the air conditioner is controlled to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger; during the process of the air conditioner running in the cooling mode for defrosting, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate.

[0006] In some embodiments, the first solenoid valve is controlled to open and the second solenoid valve is controlled to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, including: judging the relationship between the outdoor ambient temperature and a preset first temperature; if the outdoor ambient temperature is greater than or equal to the preset first temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the outdoor ambient temperature is less than the preset first temperature, judging the relationship between the temperature of the outdoor heat exchanger and a preset second temperature; if the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the temperature of the outdoor heat exchanger is less than the preset second temperature, opening the first solenoid valve and closing the second solenoid valve.

[0007] In some embodiments, the air conditioner is controlled to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger, including: judging the relationship between the temperature of the outdoor heat exchanger and a preset third temperature; if the temperature of the outdoor heat exchanger is lower than the preset third temperature, controlling the air conditioner to switch to a cooling mode for defrosting; if the temperature of the outdoor heat exchanger is greater than or equal to the preset third temperature, controlling the air conditioner to maintain the current state and continue to operate.

[0008] In some implementations, the method further includes: after controlling the air conditioner to switch to a cooling mode, closing the first solenoid valve and opening the second solenoid valve.

[0009] In some embodiments, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate, including: judging the magnitude relationship between the current change rate and a preset current change rate; if the current change rate is less than or equal to the preset current change rate, keeping the operating frequency of the compressor unchanged; if the current change rate is greater than the preset current change rate, judging the magnitude relationship between the exhaust pressure change rate and a preset exhaust pressure change rate; if the exhaust pressure change rate is less than or equal to the preset exhaust pressure change rate, keeping the operating frequency of the compressor unchanged; if the exhaust pressure change rate is greater than the preset exhaust pressure change rate, reducing the operating frequency of the compressor.

[0010] In accordance with the above method, the present invention provides a control device for defrosting an air conditioner, wherein the air conditioner comprises an outdoor heat exchanger, a compressor, a throttling component, and a frequency converter; a heat dissipation component is arranged at the frequency converter, and the heat dissipation component is used to dissipate heat for the frequency converter; a first end of the heat dissipation component is connected to a first end of the outdoor heat exchanger through a first solenoid valve, and the first end of the heat dissipation component is also connected to a second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to a first end of the outdoor heat exchanger; a first end of the outdoor heat exchanger is connected to the throttling component, and a second end is connected to the compressor; the device comprises: an acquisition unit, configured to, during the operation of the air conditioner in a heating mode, the first solenoid valve The first solenoid valve is in a closed state and the second solenoid valve is in an open state, and the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor are obtained; a control unit is configured to control the opening of the first solenoid valve and the closing of the second solenoid valve according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger; the control unit is also configured to control the air conditioner to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger after opening the first solenoid valve and closing the second solenoid valve; the control unit is also configured to control the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate during the process of the air conditioner running in the cooling mode for defrosting.

[0011] In some embodiments, the control unit controls the opening of the first solenoid valve and the closing of the second solenoid valve according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, including: judging the relationship between the outdoor ambient temperature and a preset first temperature; if the outdoor ambient temperature is greater than or equal to the preset first temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the outdoor ambient temperature is less than the preset first temperature, judging the relationship between the temperature of the outdoor heat exchanger and the preset second temperature; if the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the temperature of the outdoor heat exchanger is less than the preset second temperature, opening the first solenoid valve and closing the second solenoid valve.

[0012] In some embodiments, the control unit controls the air conditioner to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger, including: judging the relationship between the temperature of the outdoor heat exchanger and a preset third temperature; if the temperature of the outdoor heat exchanger is lower than the preset third temperature, controlling the air conditioner to switch to a cooling mode for defrosting; if the temperature of the outdoor heat exchanger is greater than or equal to the preset third temperature, controlling the air conditioner to maintain the current state and continue to operate.

[0013] In some embodiments, the control unit is further configured to close the first solenoid valve and open the second solenoid valve after controlling the air conditioner to switch to a cooling mode.

[0014] In some embodiments, the control unit controls the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate, including: judging the relationship between the current change rate and a preset current change rate; if the current change rate is less than or equal to the preset current change rate, keeping the operating frequency of the compressor unchanged; if the current change rate is greater than the preset current change rate, judging the relationship between the exhaust pressure change rate and the preset exhaust pressure change rate; if the exhaust pressure change rate is less than or equal to the preset exhaust pressure change rate, keeping the operating frequency of the compressor unchanged; if the exhaust pressure change rate is greater than the preset exhaust pressure change rate, reducing the operating frequency of the compressor.

[0015] Matching the above device, the present invention provides an air conditioner on another aspect, including: the air conditioner defrosting control device mentioned above.

[0016] In accordance with the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned air conditioning defrosting control method.

[0017] In accordance with the above method, the present invention provides a computer program product on another aspect, wherein the computer program product includes a computer program, and when the computer program product is processed and executed, the steps of the above air conditioner defrosting control method are implemented.

[0018] The solution of the present invention is provided with a heat dissipation component for dissipating heat for the inverter, the first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through the first solenoid valve, the first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger through the second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; when the air conditioner is in heating operation, the first solenoid valve is closed and the second solenoid valve is opened, and the first solenoid valve is controlled to be opened and the second solenoid valve is closed according to the outdoor ambient temperature and the outdoor heat exchanger temperature; after the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner is controlled to switch to the cooling mode for defrosting according to the outdoor heat exchanger temperature; when the air conditioner is in the defrosting process of the cooling mode, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate. Thus, by using the heat generated by the inverter to defrost the outdoor heat exchanger, the air conditioner can be defrosted while heating, avoiding the indoor heating failure and affecting the user experience. And in the defrosting process of the cooling mode, the compressor frequency is controlled according to the current change rate and voltage change rate of the compressor to ensure the stable operation of the air conditioner and improve the system efficiency.

[0019] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0020] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic flow chart of an embodiment of a method for controlling air conditioner defrosting according to the present invention;

[0022] Figure 2 It is a structural schematic diagram of an embodiment of the air conditioner defrosting control device of the present invention;

[0023] Figure 3 is a system structure diagram of the air conditioner of the present invention;

[0024] Figure 4 The figure is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention.

[0025] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0026] 1- compressor; 2- four-way valve; 3- indoor heat exchanger; 4- throttling component; 5- outdoor heat exchanger; 6- heat dissipation component; 7- fan; 8- heat dissipation fins; 9- first solenoid valve; 10- second solenoid valve; 11- temperature detection module; 102- acquisition unit; 104- control unit. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] When the air conditioner is running in heating mode, frost and snow easily condense on the outdoor heat exchanger, resulting in reduced heating performance. In order to ensure heating capacity, the air conditioner needs to enter defrost mode as required. During the defrosting process, the unit switches from heating to cooling mode, and in order to defrost faster, the outdoor fan is turned off, resulting in a continuous increase in the compressor current and a continuous increase in the system exhaust pressure. If the control is not appropriate at this time, protection is very likely to occur, reducing system reliability.

[0029] Therefore, the present invention provides a control method for defrosting an air conditioner, which fully utilizes the heat of the power device of the inverter to achieve defrosting, and combines the defrosting method of running the refrigeration mode to achieve controllable defrosting and improve user experience. Through the changes in pressure and current, the defrosting process is intelligentized, further improving system reliability and reducing failure rate.

[0030] According to an embodiment of the present invention, a control method for defrosting an air conditioner is provided, wherein the air conditioner comprises an outdoor heat exchanger, a compressor, a throttling component, and a frequency converter; a heat dissipation component is provided at the frequency converter, and the heat dissipation component is used to dissipate heat for the frequency converter. The first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through a first solenoid valve, and the first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor.

[0031] The system structure of air conditioning is as follows Figure 3As shown, the heat dissipation component 6 is a heat dissipation cold plate, and the heat dissipation cold plate includes heat dissipation fins 8 and a fan 7. The outdoor heat exchanger 5 is a fin heat exchanger, the indoor heat exchanger 3 is a plate heat exchanger, and the throttling component 4 is an electronic expansion valve. In the heating mode, the high-temperature and high-pressure refrigerant discharged from the compressor 1 passes through the four-way valve 2, the indoor heat exchanger 3, the throttling component 4, the outdoor heat exchanger 5, and the four-way valve 2 in sequence and then returns to the compressor. At the same time, part of the refrigerant flowing out of the throttling component 4 also flows to the heat dissipation component 6. At this time, controlling the opening and closing of the first solenoid valve 9 and the second solenoid valve 10 can change the path of the refrigerant flowing out of the heat dissipation component. When the first solenoid valve 9 is opened, the refrigerant flowing out of the heat dissipation component 6 flows to the four-way valve 2 through the outdoor heat exchanger 5. When the second solenoid valve 10 is opened, the refrigerant flowing out of the heat dissipation component 6 flows directly to the four-way valve 2.

[0032] In the cooling mode, the high-temperature and high-pressure refrigerant discharged from the compressor 1 passes through the four-way valve 2, the outdoor heat exchanger 5, the throttling component 4, the indoor heat exchanger 3, and the four-way valve 2 in sequence and then returns to the compressor. At the same time, part of the high-temperature and high-pressure refrigerant discharged from the compressor 1 also passes through the four-way valve 2 and the second solenoid valve 10 and then flows to the heat dissipation component 6. At this time, the first solenoid valve 9 is closed, and the refrigerant flowing out of the heat dissipation component 6 flows directly to the throttling component 4.

[0033] During the operation of the air conditioner, the refrigerant can exchange heat with the heat dissipated by the inverter at the heat dissipation component. Since the temperature of the inverter is relatively high and higher than the temperature of the refrigerant discharged by the compressor, the temperature of the refrigerant increases after the heat exchange. In heating mode, if the first solenoid valve is opened, the heated refrigerant flows into the outdoor heat exchanger, increasing the temperature at the outdoor heat exchanger and preventing frost on the outdoor heat exchanger. In cooling mode, the refrigerant discharged by the compressor can be used to dissipate heat and cool the inverter, and can prevent the risk of condensation at the inverter (there is a risk of condensation when using low-temperature refrigerant to cool the inverter). The heat dissipation component is not limited to dissipating heat for the inverter, but can also dissipate heat and cool other components that can generate higher temperatures.

[0034] like Figure 1 The flowchart of an embodiment of the method of the present invention is shown in FIG. The air conditioner defrosting control method may include: steps S110 to S140.

[0035] At step S110, when the air conditioner is operating in heating mode, the first solenoid valve is in a closed state and the second solenoid valve is in an open state, and the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor are obtained.

[0036] In the heating mode, the first solenoid valve is in a normally closed state, the second solenoid valve is in a normally open state, and the refrigerant flowing out of the electronic expansion valve is divided into two paths, one path passes through the outdoor heat exchanger and returns to the compressor, and the other path passes through the heat dissipation component and returns to the compressor. The temperature of the outdoor heat exchanger is detected by the temperature detection module 11.

[0037] The current change rate of the compressor can be calculated based on the current of the compressor at the current moment and the current of the compressor at the previous moment, that is, the current change rate = (current at the current moment - current at the previous moment) / time interval. The current of the compressor is the working current of the compressor. The exhaust pressure change rate of the compressor can be calculated based on the exhaust pressure of the compressor at the current moment and the exhaust pressure of the compressor at the previous moment, that is, the exhaust pressure change rate = (exhaust pressure at the current moment - exhaust pressure at the previous moment) / time interval. The temperature of the outdoor heat exchanger is the temperature of the surface of the outdoor heat exchanger.

[0038] In step S120, the first solenoid valve is controlled to be opened and the second solenoid valve is controlled to be closed according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, so as to increase the temperature of the outdoor heat exchanger and prevent the outdoor heat exchanger from frosting.

[0039] In some embodiments, in step S120, the specific process of controlling the opening of the first solenoid valve and the closing of the second solenoid valve according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger includes: judging the relationship between the outdoor ambient temperature and a preset first temperature; if the outdoor ambient temperature is greater than or equal to the preset first temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the outdoor ambient temperature is less than the preset first temperature, judging the relationship between the temperature of the outdoor heat exchanger and the preset second temperature; if the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the temperature of the outdoor heat exchanger is less than the preset second temperature, opening the first solenoid valve and closing the second solenoid valve.

[0040] The preset first temperature is used to determine whether the surface of the outdoor heat exchanger may be frosted, and the preset second temperature is used to determine whether the surface of the outdoor heat exchanger has been frosted. When the outdoor ambient temperature is ≥ the preset first temperature, it is considered that the outdoor heat exchanger will not be frosted; when the outdoor ambient temperature is < the preset first temperature, it means that the outdoor temperature is low and the outdoor heat exchanger is prone to frost. At this time, it is further determined whether it has been frosted based on the temperature of the outdoor heat exchanger. When the outdoor heat exchanger temperature is ≥ the preset second temperature, it is considered that the outdoor heat exchanger is not frosted; when the outdoor heat exchanger is < the preset second temperature, it is considered that the surface of the outdoor heat exchanger has been frosted, and defrosting is required. Among them, the preset first temperature is > the preset second temperature.

[0041] When it is determined that defrosting is required, the heat generated by the inverter operation is first used to defrost the outdoor heat exchanger. Specifically, the first solenoid valve is opened and the second solenoid valve is closed, so that part of the refrigerant is heated at the heat dissipation component before flowing into the outdoor heat exchanger. The heated refrigerant flows into the outdoor heat exchanger, raising the temperature of the outdoor heat exchanger for defrosting. In this process, the air conditioner always runs in the heating mode, so that the air conditioner can defrost without suspending heating, improving the user experience.

[0042] In step S130, after the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner is controlled to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger.

[0043] If the temperature of the outdoor heat exchanger cannot be prevented from frosting even after the heat dissipated by the inverter is increased, the air conditioner switches to cooling mode for defrosting when the outdoor heat exchanger is frosted.

[0044] In some embodiments, in step S130, the specific process of controlling the air conditioner to switch to the cooling mode for defrosting according to the temperature of the outdoor heat exchanger includes: judging the relationship between the temperature of the outdoor heat exchanger and a preset third temperature; if the temperature of the outdoor heat exchanger is lower than the preset third temperature, controlling the air conditioner to switch to the cooling mode for defrosting; if the temperature of the outdoor heat exchanger is greater than or equal to the preset third temperature, controlling the air conditioner to maintain the current state and continue to operate.

[0045] In the process of using the heat generated by the inverter to defrost the outdoor heat exchanger, if the outdoor heat exchanger continues to decrease, it means that the frost layer on the outdoor heat exchanger is thickening, and the heat generated by the inverter cannot meet the defrosting needs, and it is necessary to switch to the cooling mode for defrosting. Specifically, when the outdoor heat exchanger temperature is less than the preset third temperature, the air conditioner is controlled to switch to the cooling mode for defrosting; if the outdoor ambient temperature is greater than or equal to the preset third temperature, it is considered that the heat generated by the inverter can meet the defrosting needs. At this time, the air conditioner is kept in the current state and continues to operate in the heating mode, and the states of the first solenoid valve and the second solenoid valve remain unchanged. The preset third temperature is less than the preset second temperature. By determining whether the heat generated by the inverter can meet the defrosting needs based on the outdoor heat exchanger temperature, the air conditioner is promptly controlled to switch to the cooling mode for defrosting when the defrosting needs cannot be met, thereby ensuring stable operation of the air conditioner.

[0046] In some embodiments, it also includes a process of controlling the opening and closing of the first solenoid valve and the second solenoid valve when the air conditioner is switched to the cooling mode for defrosting, specifically including: after controlling the air conditioner to switch to the cooling mode, closing the first solenoid valve and opening the second solenoid valve.

[0047] When the air conditioner switches to the cooling mode for defrosting, or when the air conditioner directly runs the cooling mode for cooling the user, the first solenoid valve is closed and the second solenoid valve is opened, so that the refrigerant discharged by the compressor dissipates heat and cools the inverter to ensure the normal operation of the inverter. Among them, if the refrigerant discharged by the compressor cannot meet the requirements for cooling the inverter, for example, the temperature of the refrigerant discharged by the compressor is higher than the temperature at the heat dissipation component, the second solenoid valve is closed so that the refrigerant discharged by the compressor does not flow through the heat dissipation component.

[0048] At step S140 , during the process of the air conditioner operating in the cooling mode for defrosting, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate.

[0049] During the defrosting process in the refrigeration mode, since the system may be unstable, the stability of the system is judged based on the current change rate and the exhaust pressure change rate, and the system is kept in a stable state by controlling the compressor operating frequency to improve the system energy efficiency and defrosting efficiency.

[0050] In some embodiments, in step S140, the specific process of controlling the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate includes: judging the relationship between the current change rate and a preset current change rate; if the current change rate is less than or equal to the preset current change rate, keeping the operating frequency of the compressor unchanged; if the current change rate is greater than the preset current change rate, judging the relationship between the exhaust pressure change rate and the preset exhaust pressure change rate; if the exhaust pressure change rate is less than or equal to the preset exhaust pressure change rate, keeping the operating frequency of the compressor unchanged; if the exhaust pressure change rate is greater than the preset exhaust pressure change rate, reducing the operating frequency of the compressor.

[0051] During defrosting in refrigeration mode, due to the low outdoor temperature, the outdoor fan is usually turned off or runs at a low speed, which may cause the compressor current to continue to increase and the system exhaust pressure to continue to increase. Therefore, it is necessary to control the compressor operating frequency to ensure stable and reliable operation of the system. The compressor current change rate and exhaust pressure change rate can reflect the operating status and stability of the compressor. When the compressor current change rate is too large, the motor enters an overload state, which can easily cause the motor to overheat and be damaged. When the exhaust pressure change rate is too large, the compressor power consumption increases, reducing the system operating efficiency. Therefore, the frequency of system defrosting is controlled according to the current change rate and exhaust pressure change rate to improve the system reliability during defrosting.

[0052] Specifically, when the current change rate is greater than the preset current change rate and the exhaust pressure change rate is greater than the preset exhaust pressure change rate, it is considered that the system stability has decreased. At this time, the operating frequency of the compressor is reduced to reduce the workload and heat generation of the compressor, prevent the compressor from overheating and damage, and reduce system pressure fluctuations to improve system efficiency and stability. When the current change rate is ≤ the preset current change rate, or the exhaust pressure change rate is ≤ the preset exhaust pressure change rate, it is considered that there is no need to adjust the compressor operating frequency to avoid extending the defrosting time and affecting the experience.

[0053] Figure 4 FIG. 1 is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention. Figure 4 As shown, the method includes:

[0054] Step 1: After the air conditioner starts heating, close the first solenoid valve and open the second solenoid valve to allow the refrigerant to dissipate heat and cool the inverter. Determine whether the outdoor ambient temperature is less than the set value T1. If the outdoor ambient temperature is ≥T1, re-determine whether the outdoor ambient temperature is less than T1. If the outdoor ambient temperature is less than T1, further determine whether the outdoor heat exchanger temperature is less than the set value T2. If the outdoor heat exchanger temperature is ≥T2, re-determine whether the outdoor heat exchanger temperature is less than T2. ​​If the outdoor heat exchanger temperature is less than T2, open the first solenoid valve and close the second solenoid valve, and then execute step 2.

[0055] Step 2, determine whether the outdoor heat exchanger temperature is less than the set value T3. If the outdoor heat exchanger temperature is ≥T3, re-determine whether the outdoor heat exchanger temperature is less than T3. If the outdoor heat exchanger temperature is less than T3, control the four-way valve to switch the air conditioner to the cooling mode for defrosting, and then execute step 3.

[0056] Step 3, determine whether the compressor current change rate is greater than the set value ΔI. If the current change rate is ≤ΔI, re-determine whether the current change rate is greater than ΔI. If the current change rate is greater than ΔI, further determine whether the compressor exhaust pressure change rate is greater than the set value ΔP. If the exhaust pressure change rate is ≤ΔP, re-determine whether the exhaust pressure change rate is greater than ΔP. If the exhaust pressure change rate is greater than ΔP, reduce the compressor frequency.

[0057] The technical solution of this embodiment is adopted, and a heat dissipation component for dissipating heat for the inverter is provided. The first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through the first solenoid valve, and the first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger through the second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; when the air conditioner is in heating operation, the first solenoid valve is closed and the second solenoid valve is opened, and the first solenoid valve is controlled to be opened and the second solenoid valve is closed according to the outdoor ambient temperature and the outdoor heat exchanger temperature; after opening the first solenoid valve and closing the second solenoid valve, the air conditioner is controlled to switch to the cooling mode for defrosting according to the outdoor heat exchanger temperature; when the air conditioner is in the defrosting process of the cooling mode, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate. Thus, by using the heat generated by the inverter to defrost the outdoor heat exchanger, the air conditioner can be defrosted while heating, avoiding the indoor heating failure and affecting the user experience. And in the defrosting process of the cooling mode, the compressor frequency is controlled according to the current change rate and voltage change rate of the compressor to ensure the stable operation of the air conditioner and improve the system efficiency.

[0058] According to an embodiment of the present invention, a control device for air conditioner defrosting corresponding to the control method for air conditioner defrosting is also provided. The air conditioner includes an outdoor heat exchanger, a compressor, a throttling component, and a frequency converter; a heat dissipation component is provided at the frequency converter, and the heat dissipation component is used to dissipate heat for the frequency converter. The first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through a first solenoid valve, and the first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor.

[0059] The system structure of air conditioning is as follows Figure 3 As shown, the heat dissipation component 6 is a heat dissipation cold plate, and the heat dissipation cold plate includes heat dissipation fins 8 and a fan 7. The outdoor heat exchanger 5 is a fin heat exchanger, the indoor heat exchanger 3 is a plate heat exchanger, and the throttling component 4 is an electronic expansion valve. In the heating mode, the high-temperature and high-pressure refrigerant discharged from the compressor 1 passes through the four-way valve 2, the indoor heat exchanger 3, the throttling component 4, the outdoor heat exchanger 5, and the four-way valve 2 in sequence and then returns to the compressor. At the same time, part of the refrigerant flowing out of the throttling component 4 also flows to the heat dissipation component 6. At this time, controlling the opening and closing of the first solenoid valve 9 and the second solenoid valve 10 can change the path of the refrigerant flowing out of the heat dissipation component. When the first solenoid valve 9 is opened, the refrigerant flowing out of the heat dissipation component 6 flows to the four-way valve 2 through the outdoor heat exchanger 5. When the second solenoid valve 10 is opened, the refrigerant flowing out of the heat dissipation component 6 flows directly to the four-way valve 2.

[0060] In the cooling mode, the high-temperature and high-pressure refrigerant discharged from the compressor 1 passes through the four-way valve 2, the outdoor heat exchanger 5, the throttling component 4, the indoor heat exchanger 3, and the four-way valve 2 in sequence and then returns to the compressor. At the same time, part of the high-temperature and high-pressure refrigerant discharged from the compressor 1 also passes through the four-way valve 2 and the second solenoid valve 10 and then flows to the heat dissipation component 6. At this time, the first solenoid valve 9 is closed, and the refrigerant flowing out of the heat dissipation component 6 flows directly to the throttling component 4.

[0061] During the operation of the air conditioner, the refrigerant can exchange heat with the heat dissipated by the inverter at the heat dissipation component. Since the temperature of the inverter is relatively high and higher than the temperature of the refrigerant discharged by the compressor, the temperature of the refrigerant increases after the heat exchange. In heating mode, if the first solenoid valve is opened, the heated refrigerant flows into the outdoor heat exchanger, increasing the temperature at the outdoor heat exchanger and preventing frost on the outdoor heat exchanger. In cooling mode, the refrigerant discharged by the compressor can be used to dissipate heat and cool the inverter, and can prevent the risk of condensation at the inverter (there is a risk of condensation when using low-temperature refrigerant to cool the inverter). The heat dissipation component is not limited to dissipating heat for the inverter, but can also dissipate heat and cool other components that can generate higher temperatures.

[0062] See also Figure 2 The structure diagram of an embodiment of the device of the present invention is shown. The air conditioner defrosting control device may include: an acquisition unit 102 and a control unit 104.

[0063] The acquisition unit 102 is configured to acquire the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor when the air conditioner is operating in the heating mode and the first solenoid valve is in the closed state and the second solenoid valve is in the open state. The specific functions and processing of the acquisition unit 102 refer to step S110.

[0064] In heating mode, the first solenoid valve is in a normally closed state, and the second solenoid valve is in a normally open state. The refrigerant flowing out of the electronic expansion valve is divided into two paths, one path passes through the outdoor heat exchanger and returns to the compressor, and the other path passes through the heat dissipation component and returns to the compressor.

[0065] The current change rate of the compressor can be calculated based on the current of the compressor at the current moment and the current of the compressor at the previous moment, that is, the current change rate = (current at the current moment - current at the previous moment) / time interval. The current of the compressor is the working current of the compressor. The exhaust pressure change rate of the compressor can be calculated based on the exhaust pressure of the compressor at the current moment and the exhaust pressure of the compressor at the previous moment, that is, the exhaust pressure change rate = (exhaust pressure at the current moment - exhaust pressure at the previous moment) / time interval. The temperature of the outdoor heat exchanger is the temperature of the surface of the outdoor heat exchanger.

[0066] The control unit 104 is configured to control the first solenoid valve to open and the second solenoid valve to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger to increase the temperature of the outdoor heat exchanger and prevent the outdoor heat exchanger from frosting. The specific functions and processing of the control unit 104 refer to step S120.

[0067] In some embodiments, the control unit 104 controls the opening of the first solenoid valve and the closing of the second solenoid valve according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, including: judging the relationship between the outdoor ambient temperature and a preset first temperature; if the outdoor ambient temperature is greater than or equal to the preset first temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the outdoor ambient temperature is less than the preset first temperature, judging the relationship between the temperature of the outdoor heat exchanger and the preset second temperature; if the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, keeping the states of the first solenoid valve and the second solenoid valve unchanged; if the temperature of the outdoor heat exchanger is less than the preset second temperature, opening the first solenoid valve and closing the second solenoid valve.

[0068] The preset first temperature is used to determine whether the surface of the outdoor heat exchanger may be frosted, and the preset second temperature is used to determine whether the surface of the outdoor heat exchanger has been frosted. When the outdoor ambient temperature is ≥ the preset first temperature, it is considered that the outdoor heat exchanger will not be frosted; when the outdoor ambient temperature is < the preset first temperature, it means that the outdoor temperature is low and the outdoor heat exchanger is prone to frost. At this time, it is further determined whether it has been frosted based on the temperature of the outdoor heat exchanger. When the outdoor heat exchanger temperature is ≥ the preset second temperature, it is considered that the outdoor heat exchanger is not frosted; when the outdoor heat exchanger is < the preset second temperature, it is considered that the surface of the outdoor heat exchanger has been frosted, and defrosting is required. Among them, the preset first temperature is > the preset second temperature.

[0069] When it is determined that defrosting is required, the heat generated by the inverter operation is first used to defrost the outdoor heat exchanger. Specifically, the first solenoid valve is opened and the second solenoid valve is closed, so that part of the refrigerant is heated at the heat dissipation component before flowing into the outdoor heat exchanger. The heated refrigerant flows into the outdoor heat exchanger, raising the temperature of the outdoor heat exchanger for defrosting. In this process, the air conditioner always runs in the heating mode, so that the air conditioner can defrost without suspending heating, improving the user experience.

[0070] The control unit 104 is further configured to control the air conditioner to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger after opening the first solenoid valve and closing the second solenoid valve. The specific functions and processing of the control unit 104 refer to step S130.

[0071] If the temperature of the outdoor heat exchanger cannot be prevented from frosting even after the heat dissipated by the inverter is increased, the air conditioner switches to cooling mode for defrosting when the outdoor heat exchanger is frosted.

[0072] In some embodiments, the control unit 104 controls the air conditioner to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger, including: judging the relationship between the temperature of the outdoor heat exchanger and a preset third temperature; if the temperature of the outdoor heat exchanger is lower than the preset third temperature, controlling the air conditioner to switch to a cooling mode for defrosting; if the temperature of the outdoor heat exchanger is greater than or equal to the preset third temperature, controlling the air conditioner to maintain the current state and continue to operate.

[0073] In the process of using the heat generated by the inverter to defrost the outdoor heat exchanger, if the outdoor heat exchanger continues to decrease, it means that the frost layer on the outdoor heat exchanger is thickening, and the heat generated by the inverter cannot meet the defrosting needs, and it is necessary to switch to the cooling mode for defrosting. Specifically, when the outdoor heat exchanger temperature is less than the preset third temperature, the air conditioner is controlled to switch to the cooling mode for defrosting; if the outdoor ambient temperature is greater than or equal to the preset third temperature, it is considered that the heat generated by the inverter can meet the defrosting needs. At this time, the air conditioner is kept in the current state and continues to operate in the heating mode, and the states of the first solenoid valve and the second solenoid valve remain unchanged. The preset third temperature is less than the preset second temperature. By determining whether the heat generated by the inverter can meet the defrosting needs based on the outdoor heat exchanger temperature, the air conditioner is promptly controlled to switch to the cooling mode for defrosting when the defrosting needs cannot be met, thereby ensuring stable operation of the air conditioner.

[0074] In some implementations, the control unit 104 is further configured to close the first solenoid valve and open the second solenoid valve after controlling the air conditioner to switch to the cooling mode.

[0075] When the air conditioner switches to the cooling mode for defrosting, or when the air conditioner directly runs the cooling mode for cooling the user, the first solenoid valve is closed and the second solenoid valve is opened, so that the refrigerant discharged by the compressor dissipates heat and cools the inverter to ensure the normal operation of the inverter. Among them, if the refrigerant discharged by the compressor cannot meet the requirements for cooling the inverter, for example, the temperature of the refrigerant discharged by the compressor is higher than the temperature at the heat dissipation component, the second solenoid valve is closed so that the refrigerant discharged by the compressor does not flow through the heat dissipation component.

[0076] The control unit 104 is further configured to control the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate when the air conditioner is running in the cooling mode for defrosting. The specific functions and processing of the control unit 104 refer to step S140.

[0077] During the defrosting process in the refrigeration mode, since the system may be unstable, the stability of the system is judged based on the current change rate and the exhaust pressure change rate, and the system is kept in a stable state by controlling the compressor operating frequency to improve the system energy efficiency and defrosting efficiency.

[0078] In some embodiments, the control unit 104 controls the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate, including: judging the relationship between the current change rate and a preset current change rate; if the current change rate is less than or equal to the preset current change rate, keeping the operating frequency of the compressor unchanged; if the current change rate is greater than the preset current change rate, judging the relationship between the exhaust pressure change rate and the preset exhaust pressure change rate; if the exhaust pressure change rate is less than or equal to the preset exhaust pressure change rate, keeping the operating frequency of the compressor unchanged; if the exhaust pressure change rate is greater than the preset exhaust pressure change rate, reducing the operating frequency of the compressor.

[0079] During defrosting in refrigeration mode, due to the low outdoor temperature, the outdoor fan is usually turned off or runs at a low speed, which may cause the compressor current to continue to increase and the system exhaust pressure to continue to increase. Therefore, it is necessary to control the compressor operating frequency to ensure stable and reliable operation of the system. The compressor current change rate and exhaust pressure change rate can reflect the operating status and stability of the compressor. When the compressor current change rate is too large, the motor enters an overload state, which can easily cause the motor to overheat and be damaged. When the exhaust pressure change rate is too large, the compressor power consumption increases, reducing the system operating efficiency. Therefore, the frequency of system defrosting is controlled according to the current change rate and exhaust pressure change rate to improve the system reliability during defrosting.

[0080] Specifically, when the current change rate is greater than the preset current change rate and the exhaust pressure change rate is greater than the preset exhaust pressure change rate, it is considered that the system stability has decreased. At this time, the operating frequency of the compressor is reduced to reduce the workload and heat generation of the compressor, prevent the compressor from overheating and damage, and reduce system pressure fluctuations to improve system efficiency and stability. When the current change rate is ≤ the preset current change rate, or the exhaust pressure change rate is ≤ the preset exhaust pressure change rate, it is considered that there is no need to adjust the compressor operating frequency to avoid extending the defrosting time and affecting the experience.

[0081] Figure 4 FIG. 1 is a flow chart of another embodiment of the air conditioner defrosting control method of the present invention. Figure 4 As shown, the method includes:

[0082] Step 1: After the air conditioner starts heating, close the first solenoid valve and open the second solenoid valve to allow the refrigerant to dissipate heat and cool the inverter. Determine whether the outdoor ambient temperature is less than the set value T1. If the outdoor ambient temperature is ≥T1, re-determine whether the outdoor ambient temperature is less than T1. If the outdoor ambient temperature is less than T1, further determine whether the outdoor heat exchanger temperature is less than the set value T2. If the outdoor heat exchanger temperature is ≥T2, re-determine whether the outdoor heat exchanger temperature is less than T2. ​​If the outdoor heat exchanger temperature is less than T2, open the first solenoid valve and close the second solenoid valve, and then execute step 2.

[0083] Step 2, determine whether the outdoor heat exchanger temperature is less than the set value T3. If the outdoor heat exchanger temperature is ≥T3, re-determine whether the outdoor heat exchanger temperature is less than T3. If the outdoor heat exchanger temperature is less than T3, control the four-way valve to switch the air conditioner to the cooling mode for defrosting, and then execute step 3.

[0084] Step 3, determine whether the compressor current change rate is greater than the set value ΔI. If the current change rate is ≤ΔI, re-determine whether the current change rate is greater than ΔI. If the current change rate is greater than ΔI, further determine whether the compressor exhaust pressure change rate is greater than the set value ΔP. If the exhaust pressure change rate is ≤ΔP, re-determine whether the exhaust pressure change rate is greater than ΔP. If the exhaust pressure change rate is greater than ΔP, reduce the compressor frequency.

[0085] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0086] The technical solution of the present invention is adopted, and a heat dissipation component for dissipating heat for the inverter is provided, and the first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through the first solenoid valve, and the first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger through the second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; when the air conditioner is in heating operation, the first solenoid valve is closed and the second solenoid valve is opened, and the first solenoid valve is controlled to be opened and the second solenoid valve is closed according to the outdoor ambient temperature and the outdoor heat exchanger temperature; after opening the first solenoid valve and closing the second solenoid valve, the air conditioner is controlled to switch to the cooling mode for defrosting according to the outdoor heat exchanger temperature; when the air conditioner is in the defrosting process of the cooling mode, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate. Thus, by using the heat generated by the inverter to defrost the outdoor heat exchanger, the air conditioner can be defrosted while heating, so as to avoid the indoor heating failure and affect the user experience. And in the defrosting process of the cooling mode, the compressor frequency is controlled according to the current change rate and voltage change rate of the compressor to ensure the stable operation of the air conditioner and improve the system efficiency.

[0087] According to an embodiment of the present invention, an air conditioner corresponding to a control device for air conditioner defrosting is also provided. The air conditioner may include: the control device for air conditioner defrosting described above.

[0088] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0089] The technical solution of the present invention is adopted, and a heat dissipation component for dissipating heat for the inverter is provided, and the first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through the first solenoid valve, and the first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger through the second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; when the air conditioner is in heating operation, the first solenoid valve is closed and the second solenoid valve is opened, and the first solenoid valve is controlled to be opened and the second solenoid valve is closed according to the outdoor ambient temperature and the outdoor heat exchanger temperature; after opening the first solenoid valve and closing the second solenoid valve, the air conditioner is controlled to switch to the cooling mode for defrosting according to the outdoor heat exchanger temperature; when the air conditioner is in the defrosting process of the cooling mode, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate. Thus, by using the heat generated by the inverter to defrost the outdoor heat exchanger, the air conditioner can be defrosted while heating, so as to avoid the indoor heating failure and affect the user experience. And in the defrosting process of the cooling mode, the compressor frequency is controlled according to the current change rate and voltage change rate of the compressor to ensure the stable operation of the air conditioner and improve the system efficiency.

[0090] According to an embodiment of the present invention, a storage medium corresponding to the air conditioner defrosting control method is also provided, the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the air conditioner defrosting control method described above.

[0091] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0092] The technical solution of the present invention is adopted, and a heat dissipation component for dissipating heat for the inverter is provided, and the first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through the first solenoid valve, and the first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger through the second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; when the air conditioner is in heating operation, the first solenoid valve is closed and the second solenoid valve is opened, and the first solenoid valve is controlled to be opened and the second solenoid valve is closed according to the outdoor ambient temperature and the outdoor heat exchanger temperature; after opening the first solenoid valve and closing the second solenoid valve, the air conditioner is controlled to switch to the cooling mode for defrosting according to the outdoor heat exchanger temperature; when the air conditioner is in the defrosting process of the cooling mode, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate. Thus, by using the heat generated by the inverter to defrost the outdoor heat exchanger, the air conditioner can be defrosted while heating, so as to avoid the indoor heating failure and affect the user experience. And in the defrosting process of the cooling mode, the compressor frequency is controlled according to the current change rate and voltage change rate of the compressor to ensure the stable operation of the air conditioner and improve the system efficiency.

[0093] According to an embodiment of the present invention, a computer program product corresponding to the air conditioner defrosting control method is also provided. The computer program product includes a computer program. When the computer program product is processed and executed, the steps of the air conditioner defrosting control method are implemented.

[0094] Since the processing and functions implemented by the computer program product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0095] The technical solution of the present invention is adopted, and a heat dissipation component for dissipating heat for the inverter is provided, and the first end of the heat dissipation component is connected to the first end of the outdoor heat exchanger through the first solenoid valve, and the first end of the heat dissipation component is also connected to the second end of the outdoor heat exchanger through the second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; when the air conditioner is in heating operation, the first solenoid valve is closed and the second solenoid valve is opened, and the first solenoid valve is controlled to be opened and the second solenoid valve is closed according to the outdoor ambient temperature and the outdoor heat exchanger temperature; after opening the first solenoid valve and closing the second solenoid valve, the air conditioner is controlled to switch to the cooling mode for defrosting according to the outdoor heat exchanger temperature; when the air conditioner is in the defrosting process of the cooling mode, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate. Thus, by using the heat generated by the inverter to defrost the outdoor heat exchanger, the air conditioner can be defrosted while heating, so as to avoid the indoor heating failure and affect the user experience. And in the defrosting process of the cooling mode, the compressor frequency is controlled according to the current change rate and voltage change rate of the compressor to ensure the stable operation of the air conditioner and improve the system efficiency.

[0096] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0097] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A method for controlling air conditioner defrosting, characterized in that: The air conditioner comprises an outdoor heat exchanger, a compressor, a throttling component, and a frequency converter; a heat dissipation component is provided at the frequency converter, and the heat dissipation component is used to dissipate heat for the frequency converter; a first end of the heat dissipation component is connected to a first end of the outdoor heat exchanger through a first solenoid valve, and the first end of the heat dissipation component is also connected to a second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor; The method comprises: When the air conditioner is running in a heating mode, the first solenoid valve is in a closed state and the second solenoid valve is in an open state, and the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor are obtained; Controlling the first solenoid valve to open and the second solenoid valve to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger; After the first solenoid valve is opened and the second solenoid valve is closed, the air conditioner is controlled to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger; When the air conditioner operates in a cooling mode for defrosting, the operating frequency of the compressor is controlled according to the current change rate and the exhaust pressure change rate.

2. The air conditioner defrosting control method according to claim 1, characterized in that: Controlling the first solenoid valve to open and the second solenoid valve to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger includes: Determine the magnitude relationship between the outdoor ambient temperature and a preset first temperature; If the outdoor ambient temperature is greater than or equal to a preset first temperature, the states of the first solenoid valve and the second solenoid valve are kept unchanged; If the outdoor ambient temperature is lower than the preset first temperature, determining the magnitude relationship between the temperature of the outdoor heat exchanger and the preset second temperature; If the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, the states of the first solenoid valve and the second solenoid valve are kept unchanged; If the temperature of the outdoor heat exchanger is lower than a preset second temperature, the first solenoid valve is opened and the second solenoid valve is closed.

3. The air conditioner defrosting control method according to claim 1 or 2, characterized in that: Controlling the air conditioner to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger includes: Determining the magnitude relationship between the temperature of the outdoor heat exchanger and a preset third temperature; If the temperature of the outdoor heat exchanger is lower than a preset third temperature, controlling the air conditioner to switch to a cooling mode for defrosting; If the temperature of the outdoor heat exchanger is greater than or equal to the preset third temperature, the air conditioner is controlled to maintain the current state and continue to operate.

4. The air conditioner defrosting control method according to claim 3, characterized in that: Also includes: After the air conditioner is controlled to switch to the cooling mode, the first solenoid valve is closed and the second solenoid valve is opened.

5. The air conditioner defrosting control method according to claim 1 or 4, characterized in that: Controlling the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate includes: Determining a magnitude relationship between the current change rate and a preset current change rate; If the current change rate is less than or equal to the preset current change rate, the operating frequency of the compressor is kept unchanged; If the current change rate is greater than a preset current change rate, determining a magnitude relationship between the exhaust pressure change rate and a preset exhaust pressure change rate; If the exhaust pressure change rate is less than or equal to the preset exhaust pressure change rate, the operating frequency of the compressor is kept unchanged; If the exhaust pressure change rate is greater than a preset exhaust pressure change rate, the operating frequency of the compressor is reduced.

6. A control device for air conditioner defrosting, characterized in that: The air conditioner comprises an outdoor heat exchanger, a compressor, a throttling component, and a frequency converter; a heat dissipation component is provided at the frequency converter, and the heat dissipation component is used to dissipate heat for the frequency converter; a first end of the heat dissipation component is connected to a first end of the outdoor heat exchanger through a first solenoid valve, and the first end of the heat dissipation component is also connected to a second end of the outdoor heat exchanger through a second solenoid valve, and the second end of the heat dissipation component is connected to the first end of the outdoor heat exchanger; the first end of the outdoor heat exchanger is connected to the throttling component, and the second end is connected to the compressor; The device comprises: an acquisition unit configured to acquire the outdoor ambient temperature, the temperature of the outdoor heat exchanger, the current change rate of the compressor, and the exhaust pressure change rate of the compressor when the air conditioner is operating in a heating mode and the first solenoid valve is in a closed state and the second solenoid valve is in an open state; a control unit configured to control the first solenoid valve to open and the second solenoid valve to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger; The control unit is further configured to control the air conditioner to switch to a cooling mode for defrosting according to the temperature of the outdoor heat exchanger after opening the first solenoid valve and closing the second solenoid valve; The control unit is further configured to control the operating frequency of the compressor according to the current change rate and the exhaust pressure change rate when the air conditioner operates in a cooling mode for defrosting.

7. The air conditioner defrosting control device according to claim 6, characterized in that: The control unit controls the first solenoid valve to open and the second solenoid valve to close according to the outdoor ambient temperature and the temperature of the outdoor heat exchanger, including: Determine the magnitude relationship between the outdoor ambient temperature and a preset first temperature; If the outdoor ambient temperature is greater than or equal to a preset first temperature, the states of the first solenoid valve and the second solenoid valve are kept unchanged; If the outdoor ambient temperature is lower than the preset first temperature, determining the magnitude relationship between the temperature of the outdoor heat exchanger and the preset second temperature; If the temperature of the outdoor heat exchanger is greater than or equal to the preset second temperature, the states of the first solenoid valve and the second solenoid valve are kept unchanged; If the temperature of the outdoor heat exchanger is lower than a preset second temperature, the first solenoid valve is opened and the second solenoid valve is closed.

8. An air conditioner, characterized in that: include: The air conditioning defrosting control device as claimed in claim 6 or 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the air-conditioning defrosting control method according to any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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