Heat pump unit and defrosting method and device thereof, electronic equipment and storage medium

Abstract

The invention discloses a heat pump unit and a defrosting method and device thereof, electronic equipment and a storage medium, the heat pump unit comprises at least one refrigerant circulation system, each refrigerant circulation system comprises at least two refrigerant circulation subsystems, and the defrosting method of the heat pump unit comprises the steps that the heat exchanger temperature of each refrigerant circulation subsystem is obtained; the heat exchanger temperature of each refrigerant circulation system is determined according to the heat exchanger temperature of each refrigerant circulation subsystem; and under the condition that the temperature of the heat exchanger of at least one set of refrigerant circulation system is smaller than or equal to the first preset temperature, all the refrigerant circulation subsystems in the corresponding refrigerant circulation system are controlled to synchronously enter the defrosting mode. According to the method, the entering opportunity of defrosting is accurately grasped, the situation that the defrosting time is too long or defrosting is not thorough can be avoided, and therefore the stability of the heat pump unit is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a heat pump unit and a defrosting method, device, electronic equipment and storage medium thereof. BACKGROUND

[0002] When the air source heat pump unit is in heating operation, frost is easy to form on the surface of the fin of the outdoor heat exchanger, and when the frost is serious, the heat exchange efficiency will be affected, and the heating capacity of the unit will be reduced. The defrosting methods in the related art include reverse cycle defrosting and hot gas bypass defrosting, etc., but for a heat pump unit with two independent systems and each fin of the two independent systems, since the frost conditions of the two fins may be inconsistent, the defrosting methods in the related art cannot accurately grasp the defrosting time, which is easy to cause the defrosting time to be too long or the defrosting to be incomplete, thereby affecting the stable operation of the heat pump unit. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the first object of the present application is to provide a defrosting method for a heat pump unit, taking the temperature of the heat exchanger as a judgment parameter for whether to enter the defrosting mode, when the temperature of the heat exchanger of the refrigerant circulation system is less than or equal to a first preset temperature, all refrigerant circulation subsystems of the refrigerant circulation system enter the defrosting mode synchronously, the entry time of defrosting is accurately grasped, and the situation that the defrosting time is too long or the defrosting is incomplete can be avoided, thereby ensuring the stability of the heat pump unit.

[0004] The second object of the present application is to provide a computer readable storage medium.

[0005] The third object of the present application is to provide an electronic equipment.

[0006] The fourth object of the present application is to provide a defrosting device for a heat pump unit.

[0007] The fifth object of the present application is to provide a heat pump unit.

[0008] To achieve the above objects, according to the first aspect of the present application, a defrosting method for a heat pump unit is provided, the heat pump unit comprising at least one set of refrigerant circulation system, each set of refrigerant circulation system comprising at least two refrigerant circulation subsystems, the method comprising: obtaining the temperature of the heat exchanger of each refrigerant circulation subsystem; determining the temperature of the heat exchanger of each set of refrigerant circulation system according to the temperature of the heat exchanger of each refrigerant circulation subsystem; and in the case that the temperature of the heat exchanger of at least one set of refrigerant circulation system is less than or equal to a first preset temperature, controlling all refrigerant circulation subsystems in the corresponding refrigerant circulation system to enter the defrosting mode synchronously.

[0009] The defrosting method of the heat pump unit according to the embodiment of the present application obtains the heat exchanger temperature of each refrigerant circulation subsystem, determines the heat exchanger temperature of each group of refrigerant circulation systems according to the heat exchanger temperature of each refrigerant circulation subsystem, and controls all refrigerant circulation subsystems in the corresponding refrigerant circulation system to enter the defrosting mode synchronously in the case that the heat exchanger temperature of at least one group of refrigerant circulation systems is less than or equal to the first preset temperature, wherein the heat pump unit comprises at least one group of refrigerant circulation systems, and each group of refrigerant circulation systems comprises at least two refrigerant circulation subsystems. Thus, the heat exchanger temperature is taken as the judgment parameter of whether to enter the defrosting mode, and all refrigerant circulation subsystems of the refrigerant circulation system enter the defrosting mode synchronously when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, so that the entering time of the defrosting is accurately grasped, and the situation that the defrosting time is too long or the defrosting is not complete can be avoided, thereby ensuring the stability of the heat pump unit.

[0010] According to an embodiment of the present application, each refrigerant circulation subsystem comprises a compressor and a four-way valve, and the method of controlling all refrigerant circulation subsystems in the corresponding refrigerant circulation system to enter the defrosting mode synchronously comprises: synchronously reducing the frequency of all compressors in the corresponding refrigerant circulation system to the first starting frequency, and performing reversing control on all four-way valves in the corresponding refrigerant circulation system; and synchronously increasing the frequency of all compressors in the corresponding refrigerant circulation system.

[0011] According to an embodiment of the present application, after synchronously increasing the frequency of all compressors in the corresponding refrigerant circulation system, the method further comprises: in the case that the heat exchanger temperature of the corresponding refrigerant circulation system is greater than the second preset temperature, synchronously reducing the frequency of all compressors in the corresponding refrigerant circulation system to the second starting frequency, and performing recovery control on the flow direction of all four-way valves in the corresponding refrigerant circulation system, wherein the second preset temperature is greater than the first preset temperature; and controlling the frequency of the corresponding compressor according to the operating state of all refrigerant circulation subsystems in the corresponding refrigerant circulation system.

[0012] According to an embodiment of the present application, the method further comprises: in the case that the frequency of all compressors in the corresponding refrigerant circulation system reaches the upper limit frequency and the heat exchanger temperature of the corresponding refrigerant circulation system is less than or equal to the second preset temperature, controlling all compressors in the corresponding refrigerant circulation system to operate at the upper limit frequency.

[0013] According to an embodiment of the present application, each refrigerant circulation subsystem comprises a fan, and the method further comprises: in the case that the frequency of each compressor in the corresponding refrigerant circulation system is synchronously reduced to the first starting frequency, controlling all outdoor fans in the corresponding refrigerant circulation system to stop.

[0014] According to one of the embodiments of the present application, the method further comprises: controlling all outdoor fans in the corresponding refrigerant circulation system to start under the condition that the frequency of the corresponding compressor is controlled according to the operating state of all refrigerant circulation subsystems in the corresponding refrigerant circulation system.

[0015] According to one of the embodiments of the present application, the first starting frequency is the lowest operating frequency of the compressor.

[0016] According to one of the embodiments of the present application, the heat exchanger temperature of each group of refrigerant circulation systems is determined according to the heat exchanger temperature of each refrigerant circulation subsystem, comprising: taking the smaller value among all heat exchanger temperatures corresponding to each group of refrigerant circulation systems as the heat exchanger temperature of each group of refrigerant circulation systems.

[0017] According to one of the embodiments of the present application, each group of refrigerant circulation systems comprises two refrigerant circulation subsystems, the heat exchanger of each refrigerant circulation subsystem comprises fins, and all fins in each group of refrigerant circulation systems share one bracket.

[0018] According to one of the embodiments of the present application, the bracket is V-shaped.

[0019] To achieve the above object, the second aspect of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is processed by a processor to execute the defrosting method of the heat pump unit according to any one of the above embodiments.

[0020] The computer readable storage medium according to the embodiments of the present application, by executing the computer program of the defrosting method of the heat pump unit, takes the heat exchanger temperature as the judgment parameter of whether to enter the defrosting mode, and when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, all refrigerant circulation subsystems of the refrigerant circulation system enter the defrosting mode synchronously, accurately grasps the entering time of defrosting, and can avoid the situation of too long defrosting time or incomplete defrosting, thereby ensuring the stability of the heat pump unit.

[0021] To achieve the above object, the third aspect of the present application provides an electronic device, which comprises a memory, a processor, and a defrosting program of the heat pump unit stored in the memory and executable on the processor, and the processor executes the defrosting program of the heat pump unit to implement the defrosting method of the heat pump unit according to any one of the above embodiments.

[0022] The electronic device according to the embodiment of the present application, by executing the computer program of the defrosting method of the heat pump unit through the processor, takes the heat exchanger temperature as the judgment parameter of whether to enter the defrosting mode, and when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, all the refrigerant circulation subsystems of the refrigerant circulation system synchronously enter the defrosting mode, so that the entering time of the defrosting is accurately grasped, the situation of too long defrosting time or incomplete defrosting can be avoided, and the stability of the heat pump unit is ensured.

[0023] To achieve the above object, according to the fourth aspect of the present application, a defrosting device of a heat pump unit is provided, the heat pump unit comprising at least one group of refrigerant circulation systems, each group of refrigerant circulation systems comprising all refrigerant circulation subsystems, the device comprising: an acquisition module configured to acquire the heat exchanger temperature of each refrigerant circulation subsystem; a determination module configured to determine the heat exchanger temperature of each group of refrigerant circulation systems according to the heat exchanger temperature of each refrigerant circulation subsystem; and a first control module configured to control all refrigerant circulation subsystems in the corresponding refrigerant circulation system to synchronously enter a defrosting mode when the heat exchanger temperature of at least one group of refrigerant circulation systems is less than or equal to a first preset temperature.

[0024] The defrosting device of the heat pump unit according to the embodiment of the present application, by the acquisition module acquiring the heat exchanger temperature of each refrigerant circulation subsystem, the determination module determining the heat exchanger temperature of each group of refrigerant circulation systems according to the heat exchanger temperature of each refrigerant circulation subsystem, and the first control module controlling all refrigerant circulation subsystems in the corresponding refrigerant circulation system to synchronously enter a defrosting mode when the heat exchanger temperature of at least one group of refrigerant circulation systems is less than or equal to a first preset temperature, wherein the heat pump unit comprises at least one group of refrigerant circulation systems, and each group of refrigerant circulation systems comprises at least two refrigerant circulation subsystems. Thus, the heat exchanger temperature is taken as the judgment parameter of whether to enter the defrosting mode, and when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, all the refrigerant circulation subsystems of the refrigerant circulation system synchronously enter the defrosting mode, so that the entering time of the defrosting is accurately grasped, the situation of too long defrosting time or incomplete defrosting can be avoided, and the stability of the heat pump unit is ensured.

[0025] To achieve the above object, according to the fifth aspect of the present application, a heat pump unit is provided, comprising the foregoing electronic device or the foregoing defrosting device of the heat pump unit.

[0026] The heat pump unit according to the embodiment of the present application, by using the heat exchanger temperature as the judgment parameter of whether to enter the defrosting mode, when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, all the refrigerant circulation subsystems of the refrigerant circulation system synchronously enter the defrosting mode, the entering time of the defrosting is accurately grasped, the situation of the defrosting time being too long or the defrosting being not thorough can be avoided, and the stability of the heat pump unit is ensured.

[0027] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of a heat pump unit according to an embodiment of the present application;

[0029] Figure 2 is a structural schematic diagram of a refrigerant circulation system according to an embodiment of the present application;

[0030] Figure 3 is a structural schematic diagram of a refrigerant circulation system according to another embodiment of the present application;

[0031] Figure 4 is a flow schematic diagram of a defrosting method of a heat pump unit according to an embodiment of the present application;

[0032] Figure 5 is a flow schematic diagram of a defrosting method of a heat pump unit according to a specific embodiment of the present application;

[0033] Figure 6 is a system schematic diagram of an electronic device according to an embodiment of the present application;

[0034] Figure 7 is a structural schematic diagram of a dust removal device of a heat pump unit according to an embodiment of the present application;

[0035] Figure 8 is a system schematic diagram of a heat pump unit according to an embodiment of the present application;

[0036] Figure 9 is a system schematic diagram of a heat pump unit according to another embodiment of the present application. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which like reference numerals indicate like elements or elements having the same or similar function throughout the several views. The embodiments described below are exemplary and are intended to be illustrative of the present application, and are not to be construed as limiting the present application.

[0038] It should be noted that the present application is made by the inventors' understanding and research on the following problems:

[0039] The defrosting mode in the related art includes reverse cycle defrosting, hot gas bypass defrosting, etc., but these defrosting modes have some shortcomings, the reverse cycle defrosting needs to stop and switch the refrigeration mode, the compressor needs to be frequently started and stopped, the energy consumption is high, and the working condition changes drastically, which requires high reliability of parts; the hot gas bypass defrosting has problems such as insufficient refrigerant flow, too low suction pressure, and long defrosting time.

[0040] For a heat pump unit with two independent systems and each system having one fin, for example, a V-shaped heat exchanger fin heat pump unit, since the frosting conditions of the two fins may be inconsistent, the defrosting mode in the related art cannot accurately grasp the entry and exit timing of defrosting, which is easy to cause the defrosting time to be too long or the defrosting to be incomplete, thereby affecting the stable operation of the heat pump unit.

[0041] In addition, when the defrosting periods of the two independent systems are inconsistent, for example, the fin of the first system enters the defrosting mode, and the second system runs in the heating mode, during the defrosting process of the first system, the water vapor melted on the fin of the first system will migrate to the fin of the second system due to the suction of the fan of the second system, and the frosting condition of the fin of the second system will be worse, resulting in the attenuation of the heating capacity of the second system and the too low evaporation pressure, thereby shortening the time of the second system entering the defrosting mode, when the first system completes the defrosting, the second system immediately enters the defrosting mode, and the first system repeats the frosting mode of the second system, and the two systems alternate defrosting, therefore, the first system and the second system cannot be synchronized in heating and defrosting, and the heat pump unit cannot be full load, which seriously affects the heating capacity of the heat pump unit, resulting in poor user experience.

[0042] Therefore, based on this, the embodiments of the present application provide a heat pump unit and a defrosting method, device, electronic equipment and storage medium thereof, which take the temperature of the heat exchanger as a judgment parameter for whether to enter the defrosting mode, when the temperature of the heat exchanger of the refrigerant circulation system is less than or equal to a first preset temperature, all refrigerant circulation subsystems of the refrigerant circulation system enter the defrosting mode synchronously, the entry timing of defrosting is accurately grasped, and the situation of too long defrosting time or incomplete defrosting can be avoided, thereby ensuring the stability of the heat pump unit.

[0043] The heat pump unit and the defrosting method, device, electronic equipment and storage medium thereof of the embodiments of the present application are described below with reference to the accompanying drawings.

[0044] Figure 1 is a structural schematic diagram of a heat pump unit according to an embodiment of the present application. As shown in Figure 1As shown, the heat pump unit 1000 includes at least one set of refrigerant circulation system 100, and each set of refrigerant circulation system 100 includes at least two refrigerant circulation subsystems 10.

[0045] Specifically, when there are multiple sets of refrigerant circulation system, the multiple sets of refrigerant circulation system are independently operated, and all the refrigerant circulation subsystems in each set of refrigerant circulation system 100 are also independently operated.

[0046] As shown in FIG. 1, the heat pump unit 1000 includes at least one set of refrigerant circulation system 100, and each set of refrigerant circulation system 100 includes at least two refrigerant circulation subsystems 10. Figure 2 and Figure 3 As an example of a set of refrigerant circulation system, each set of refrigerant circulation system includes two refrigerant circulation subsystems, i.e., a first refrigerant circulation subsystem 11 and a second refrigerant circulation subsystem 12. The first refrigerant circulation subsystem 11 and the second refrigerant circulation subsystem 12 each include a heat exchanger. Because the two refrigerant circulation subsystems are independently operated, the heat exchangers of the two refrigerant circulation subsystems have inconsistent frosting conditions, which leads to the problem of too long defrosting time or incomplete defrosting for each set of refrigerant circulation system.

[0047] In some embodiments, each set of refrigerant circulation system includes two refrigerant circulation subsystems, the heat exchanger of each refrigerant circulation subsystem includes fins, and all the fins in each set of refrigerant circulation system share one bracket.

[0048] As shown in FIG. 1, the heat pump unit 1000 includes at least one set of refrigerant circulation system 100, and each set of refrigerant circulation system 100 includes at least two refrigerant circulation subsystems 10. Figure 2 and Figure 3 As shown in FIG. 1, the heat exchanger of the first refrigerant circulation subsystem includes first fins 111, the heat exchanger of the second refrigerant circulation subsystem includes second fins 121, and the first fins 111 and the second fins 121 are free of any baffle and share one bracket 20. Optionally, the bracket 20 is a V-shaped bracket as shown in FIG. 1. Figure 2 and Figure 3 As shown in FIG. 1, the heat exchanger of the first refrigerant circulation subsystem includes first fins 111, the heat exchanger of the second refrigerant circulation subsystem includes second fins 121, and the first fins 111 and the second fins 121 are free of any baffle and share one bracket 20. Optionally, the bracket 20 is a V-shaped bracket as shown in FIG. 1.

[0049] Figure 4 FIG. 2 is a flowchart of a defrosting method of a heat pump unit according to an embodiment of the present application. As shown in FIG. 2, the defrosting method of the heat pump unit includes the following steps. Figure 4

[0050] S101, obtaining the temperature of the heat exchanger of each refrigerant circulation subsystem.

[0051] Specifically, because the heat pump unit has the problem of frosting only in the heating mode, the temperature of the heat exchanger of each refrigerant circulation subsystem needs to be obtained when the heat pump unit is in the heating mode.

[0052] In an optional implementation, a temperature sensor can be arranged in each refrigerant circulation subsystem to detect the temperature of the heat exchanger of each refrigerant circulation subsystem. For example, when each set of refrigerant circulation system includes two refrigerant circulation subsystems, a temperature sensor can be arranged in each refrigerant circulation subsystem to detect the temperature of the heat exchanger of each refrigerant circulation subsystem. Figure 2 and Figure 3 ​The first temperature sensor (not shown) can be arranged on the first fin to detect the fin tube temperature of the first fin to obtain the heat exchanger temperature of the first refrigerant circulation subsystem, and the second temperature sensor (not shown) can be arranged on the second fin to detect the fin tube temperature of the second fin to obtain the heat exchanger temperature of the second refrigerant circulation subsystem.

[0053] S102, determining the heat exchanger temperature of each group of refrigerant circulation systems according to the heat exchanger temperature of each refrigerant circulation subsystem.

[0054] Specifically, the heat exchanger temperature of each group of refrigerant circulation systems can be determined according to the heat exchanger temperature of all refrigerant circulation subsystems in each group of refrigerant circulation systems, and the heat exchanger temperature of each group of refrigerant circulation systems is taken as a parameter for judging whether the group of refrigerant circulation systems enters the defrosting mode.

[0055] S103, in the case that the heat exchanger temperature of at least one group of refrigerant circulation systems is less than or equal to the first preset temperature, controlling all refrigerant circulation subsystems in the corresponding refrigerant circulation system to synchronously enter the defrosting mode.

[0056] Specifically, when the heat exchanger temperature of at least one group of refrigerant circulation systems is less than or equal to the first preset temperature, it indicates that the corresponding refrigerant circulation system has a frosting condition, and the corresponding refrigerant circulation system needs to be defrosted. Therefore, all refrigerant circulation subsystems in the corresponding refrigerant circulation system are controlled to synchronously enter the defrosting mode, so that all refrigerant circulation subsystems in the corresponding refrigerant circulation system start defrosting at the same time.

[0057] It should be noted that all refrigerant circulation subsystems in each group of refrigerant circulation systems are synchronously defrosted, but when there are multiple groups of refrigerant circulation systems, the multiple groups of refrigerant circulation systems are not necessarily synchronously defrosted. For example, assuming that the refrigerant circulation system has two groups, when the heat exchanger temperature of one group of refrigerant circulation systems is less than or equal to the first preset temperature, all refrigerant circulation subsystems in the group of refrigerant circulation systems are controlled to synchronously enter the defrosting mode, and the other group of refrigerant circulation systems continues to run in the heating mode. With the increase of the running time of the heat pump unit, if the heat exchanger temperature of the other group of refrigerant circulation systems is less than or equal to the first preset temperature, all refrigerant circulation subsystems in the group of refrigerant circulation systems are controlled to synchronously enter the defrosting mode.

[0058] In the above embodiment, the heat exchanger temperature is taken as a judgment parameter for whether to enter the defrosting mode, when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, all refrigerant circulation subsystems of the refrigerant circulation system are controlled to enter the defrosting mode synchronously, the entering timing of defrosting is accurately grasped, and the situation of too long defrosting time or incomplete defrosting can be avoided, thereby ensuring the stability of the heat pump unit; and when defrosting is needed, all refrigerant circulation subsystems of the refrigerant circulation system enter the defrosting mode synchronously, and when defrosting is not needed, all refrigerant circulation subsystems of the refrigerant circulation system are in the heating mode synchronously, synchronous heating and synchronous defrosting are realized, therefore, the heat pump unit can be operated at full load, thereby improving the heating capacity of the heat pump unit and further improving the user experience.

[0059] In some embodiments, the heat exchanger temperature of each group of refrigerant circulation systems is determined according to the heat exchanger temperature of each refrigerant circulation subsystem, including: taking the minimum value of all heat exchanger temperatures corresponding to each group of refrigerant circulation systems as the heat exchanger temperature of each group of refrigerant circulation systems.

[0060] That is, the minimum value of all heat exchanger temperatures of each group of refrigerant circulation systems corresponding to each group of refrigerant circulation systems can be taken as the heat exchanger temperature of each group of refrigerant circulation systems, when the minimum value of all heat exchanger temperatures of each group of refrigerant circulation systems is less than or equal to the first preset temperature, it indicates that at least one of all refrigerant circulation subsystems exists frost, therefore, the corresponding refrigerant circulation system needs to be defrosted.

[0061] In some embodiments, each refrigerant circulation subsystem includes a compressor (not shown) and a four-way valve (not shown), wherein controlling all refrigerant circulation subsystems in the corresponding refrigerant circulation system to enter the defrosting mode synchronously includes: synchronously reducing the frequency of all compressors in the corresponding refrigerant circulation system to the first start frequency, and performing reversing control on all four-way valves in the corresponding refrigerant circulation system; synchronously increasing the frequency of all compressors in the corresponding refrigerant circulation system.

[0062] Specifically, the compressor of each refrigerant circulation subsystem is a variable frequency compressor, when the heat pump unit is in the heating mode, the compressor usually operates at the rated working frequency, if the compressor is directly controlled to increase the frequency, the reliability of the compressor will be reduced due to the existence of voltage difference, thereby affecting the operation of the heat pump unit. Therefore, the compressors of all refrigerant circulation subsystems of the corresponding refrigerant circulation system are synchronously reduced to the first start frequency, so as to make all refrigerant circulation subsystems of the corresponding refrigerant circulation system enter the reverse cycle defrosting, and at the same time, all four-way valves in the corresponding refrigerant circulation system need to be controlled to switch the refrigerant flow direction, so that all refrigerant circulation subsystems in the corresponding refrigerant circulation system are in the refrigeration mode, during the defrosting process, all compressors of the corresponding refrigerant circulation system are synchronously controlled to increase the frequency, and the frost layer is melted by operating in the refrigeration mode.

[0063] It should be noted that the first starting frequency is less than the rated operating frequency of the compressor in the heating mode, and the specific values of the first starting frequency and the upper limit frequency can be set according to the actual operation of the heat pump unit.

[0064] Optionally, in some embodiments, the first starting frequency is the minimum operating frequency of the compressor.

[0065] It can be understood that when the operating load of the heat pump unit is small, the compressor can work at the minimum operating frequency. If the first starting frequency is higher than the minimum operating frequency, the compressor working at the minimum operating frequency can cause reliability to decrease due to pressure difference, thereby affecting the operation of the heat pump unit. Therefore, the first starting frequency is set to the minimum operating frequency, so that when the compressor works at the minimum operating frequency, the compressor can be directly frequency-raised.

[0066] In the above embodiments, by synchronously reducing the frequency of the compressor and then synchronously raising the frequency of the compressor, the reverse cycle defrosting can be realized without stopping the compressor, which reduces the capacity decay and the impact on the stability of the unit caused by the frequent start-stop of the compressor during defrosting, thereby improving the operation reliability of the heat pump unit. Moreover, since the reverse cycle defrosting is adopted, there is no problem of insufficient refrigerant flow, too low suction pressure, and long defrosting time in hot gas bypass defrosting, thereby improving the heating performance and energy utilization efficiency of the heat pump unit.

[0067] In some embodiments, after the frequencies of all the compressors in the corresponding refrigerant circulation system are synchronously raised, the method further comprises: in a case where the temperature of the heat exchanger of the corresponding refrigerant circulation system is greater than a second preset temperature, synchronously reducing the frequencies of all the compressors in the corresponding refrigerant circulation system to a second starting frequency, and restoring the flow direction control of all the four-way valves in the corresponding refrigerant circulation system, wherein the second preset temperature is greater than the first preset temperature; and controlling the frequencies of the corresponding compressors according to the operating states of all the refrigerant circulation subsystems in the corresponding refrigerant circulation system.

[0068] Specifically, when the heat exchanger temperature of the corresponding refrigerant circulation system is greater than the second preset temperature, it indicates that all the heat exchangers of the corresponding refrigerant circulation system have no frost formation, and the defrosting process can be ended, so it is not necessary to continue the synchronous frequency raising, and all the compressors of the corresponding refrigerant circulation system can be controlled to resume normal operation. Because all the compressors of the refrigerant circulation system are synchronous frequency raising during the defrosting process, when exiting the defrosting mode, the frequency of all the compressors in the corresponding refrigerant circulation system needs to be synchronous reduced to the second starting frequency, and the four-way valve needs to be restored to the original flow direction, and then the energy demand state of all the refrigerant circulation subsystems can be determined according to the running state of all the refrigerant circulation subsystems in the corresponding refrigerant circulation system, the target running frequency of all the refrigerant circulation subsystems can be determined according to the energy demand state of all the refrigerant circulation subsystems, and then the compressors of all the refrigerant circulation subsystems are controlled according to the target running frequency of all the refrigerant circulation subsystems.

[0069] In the above embodiment, the heat exchanger temperature can not only be used as a judgment parameter for entering the defrosting mode, but also be used as a judgment parameter for exiting the defrosting mode. After the heat exchanger temperature of the refrigerant circulation system is greater than the second preset temperature, all the refrigerant circulation subsystems of the refrigerant circulation system exit the defrosting mode synchronously, the entering and exiting timing of the defrosting is accurately grasped, and thus the stability of the heat pump unit is further improved.

[0070] In some embodiments, the method further comprises: in the case that the frequency of all the compressors in the corresponding refrigerant circulation system reaches the upper limit frequency, and the heat exchanger temperature of the corresponding refrigerant circulation system is less than or equal to the second preset temperature, controlling all the compressors in the corresponding refrigerant circulation system to operate at the upper limit frequency.

[0071] That is, when the frequency of all the compressors in the corresponding refrigerant circulation system reaches the upper limit frequency, all the compressors in the corresponding refrigerant circulation system have reached the upper limit of the frequency, and cannot continue to raise the frequency, so the synchronous frequency raising is no longer continued. Because there is a certain hysteresis in the heat exchanger temperature rising, there is a case that the frequency of all the compressors reaches the upper limit frequency, but the heat exchanger temperature of the refrigerant circulation system has not risen to the second preset temperature. At this time, all the compressors in the corresponding refrigerant circulation system are controlled to operate at the upper limit frequency until the heat exchanger temperature of the refrigerant circulation system rises to the second preset temperature.

[0072] In some embodiments, each refrigerant circulation subsystem comprises a fan, and the method further comprises: in the case that the frequency of each compressor in the corresponding refrigerant circulation system is synchronous reduced to the first starting frequency, controlling all the outdoor fans in the corresponding refrigerant circulation system to stop.

[0073] In some embodiments, the method further comprises: in the case that the frequency of each compressor in the corresponding refrigerant circulation system is synchronous reduced to the first starting frequency, controlling all the indoor fans in the corresponding refrigerant circulation system to stop. Figure 2 In some embodiments, the method further comprises: in the case that the frequency of each compressor in the corresponding refrigerant circulation system is synchronous reduced to the first starting frequency, controlling all the indoor fans in the corresponding refrigerant circulation system to stop. Figure 3As shown, the first refrigerant circulation subsystem 11 further comprises a first fan 112, and the heat exchanger of the second refrigerant circulation subsystem 12 further comprises a second fan 122. When the frequency of each compressor in the corresponding refrigerant circulation system is controlled to be synchronously reduced to the first starting frequency, that is, the corresponding refrigerant circulation system enters the defrosting mode, it is also necessary to control all outdoor fans in the corresponding refrigerant circulation system to stop running at the same time, so that all refrigerant circulation subsystems in the corresponding refrigerant circulation system are in the refrigeration mode, and all refrigerant circulation subsystems start defrosting.

[0074] In some embodiments, the method further comprises: controlling all outdoor fans in the corresponding refrigerant circulation system to start running in the case of controlling the frequency of the corresponding compressor according to the running state of all refrigerant circulation subsystems in the corresponding refrigerant circulation system.

[0075] Specifically, after all refrigerant circulation subsystems in the corresponding refrigerant circulation system exit the defrosting mode and resume normal operation, it is also necessary to control all outdoor fans in the corresponding refrigerant circulation system to start running, and the rotating speed of all outdoor fans in the corresponding refrigerant circulation system can also be determined according to the running state of all refrigerant circulation subsystems in the corresponding refrigerant circulation system.

[0076] In the above embodiments, the fans of all refrigerant circulation subsystems in the refrigerant circulation system are synchronously controlled to start and stop, which optimizes the water vapor migration problem in the defrosting process, prevents the water vapor melted in the defrosting process of one refrigerant circulation subsystem from migrating to another refrigerant circulation subsystem, and causes the frosting condition of the another refrigerant circulation subsystem to deteriorate, thereby improving the defrosting efficiency and further improving the heating and heat exchange capacity of the heat pump unit.

[0077] The technical solutions of the present application will be further described in detail below in combination with specific embodiments:

[0078] When the heat pump unit comprises a group of refrigerant circulation systems, and each refrigerant circulation system comprises two refrigerant circulation subsystems (respectively, a first refrigerant circulation subsystem and a second refrigerant circulation subsystem), as shown, Figure 5 The defrosting method of the heat pump unit comprises the following steps:

[0079] S201, obtaining the heat exchanger temperature of the first refrigerant circulation subsystem and the heat exchanger temperature of the second refrigerant circulation subsystem.

[0080] S202, taking the smaller value of the heat exchanger temperature of the first refrigerant circulation subsystem and the heat exchanger temperature of the second refrigerant circulation subsystem as the heat exchanger temperature of the refrigerant circulation system.

[0081] S203, judging whether the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, if yes, executing step S204, and if no, executing step S212.

[0082] S204, the frequency of the compressor of the first refrigerant circulation subsystem and the frequency of the compressor of the second refrigerant circulation subsystem are synchronously reduced to the first starting frequency, the four-way valves of the first refrigerant circulation subsystem and the second refrigerant circulation subsystem are controlled to reverse, and the fans of the first refrigerant circulation subsystem and the second refrigerant circulation subsystem are controlled to stop.

[0083] S205, the frequency of the compressor of the first refrigerant circulation subsystem and the frequency of the compressor of the second refrigerant circulation subsystem are synchronously increased.

[0084] S206, it is judged whether the heat exchanger temperature of the refrigerant circulation system is greater than the second preset temperature, if yes, step S209 is executed, and if no, step S207 is executed.

[0085] S207, it is judged whether the frequency of the compressor of the first refrigerant circulation subsystem and the frequency of the compressor of the second refrigerant circulation subsystem reach the upper limit frequency, if yes, step S208 is executed, and if no, step S205 is executed.

[0086] S208, the compressor of the first refrigerant circulation subsystem and the compressor of the second refrigerant circulation subsystem are controlled to operate at the upper limit frequency.

[0087] S209, the frequency of the compressor of the first refrigerant circulation subsystem and the frequency of the compressor of the second refrigerant circulation subsystem are synchronously reduced to the second starting frequency, and the flow direction of the two four-way valves in the corresponding refrigerant circulation system is controlled to restore.

[0088] S210, the compressor of the first refrigerant circulation subsystem is controlled according to the operating state of the first refrigerant circulation subsystem, and the compressor of the second refrigerant circulation subsystem is controlled according to the operating state of the second refrigerant circulation subsystem.

[0089] S211, the fan of the first refrigerant circulation subsystem and the fan of the second refrigerant circulation subsystem are controlled to start.

[0090] S212, the operating state of the first refrigerant circulation subsystem and the second refrigerant circulation subsystem is kept unchanged.

[0091] In summary, according to the defrosting method of the heat pump unit provided in the embodiments of the present application, the heat exchanger temperature can be used as a judgment parameter for entering and exiting the defrosting mode, the entering and exiting timing of defrosting is accurately grasped, the situation of long defrosting time or incomplete defrosting can be avoided, and thus the stability of the heat pump unit is ensured. In addition, all the refrigerant circulation subsystems of the refrigerant circulation system enter the defrosting mode synchronously when defrosting is needed, and are in the heating mode synchronously when defrosting is not needed, synchronous heating and synchronous defrosting are realized, and thus the heat pump unit can be operated at full load, the heating capacity of the heat pump unit is improved, and the user experience is improved. Furthermore, the compressor is reduced in frequency synchronously and then increased in frequency synchronously, and thus the inverse cycle defrosting can be realized without stopping the compressor, the capacity attenuation and the influence on the stability of the unit caused by frequent start and stop of the compressor during the defrosting process are reduced, and thus the operation reliability of the heat pump unit is improved. Moreover, since the inverse cycle defrosting is used, the problems of insufficient refrigerant flow, excessively low suction pressure and long defrosting time in the hot gas bypass defrosting are solved, and the heating performance and the energy utilization efficiency of the heat pump unit are improved. Furthermore, the fans of all the refrigerant circulation subsystems in the refrigerant circulation system are controlled to start and stop synchronously, the water vapor migration problem during the defrosting process is optimized, the water vapor melted in the defrosting process of one refrigerant circulation subsystem is prevented from migrating to another refrigerant circulation subsystem, and thus the defrosting efficiency is improved, and the heating and heat exchange capacity of the heat pump unit is further improved.

[0092] Corresponding to the above-mentioned embodiments, the embodiments of the present application further provide a computer readable storage medium, which stores a computer program, and the computer program is processed by a processor to execute the defrosting method of the heat pump unit of any of the above-mentioned embodiments.

[0093] According to the computer readable storage medium provided in the embodiments of the present application, the heat exchanger temperature is used as a judgment parameter for entering the defrosting mode, when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, all the refrigerant circulation subsystems of the refrigerant circulation system enter the defrosting mode synchronously, the entering timing of defrosting is accurately grasped, and thus the situation of long defrosting time or incomplete defrosting can be avoided, and the stability of the heat pump unit is ensured.

[0094] Corresponding to the above-mentioned embodiments, the embodiments of the present application further provide an electronic device. As shown in Figure 6 the electronic device 300 includes a memory 310, a processor 320, and a defrosting program of a heat pump unit stored in the memory 310 and executable on the processor 320, and when the processor 320 executes the defrosting program of the heat pump unit, the defrosting method of the heat pump unit of any of the above-mentioned embodiments is realized.

[0095] The electronic device according to the embodiments of the present application, by executing the computer program of the defrosting method of the heat pump unit through the processor, takes the heat exchanger temperature as the judgment parameter of whether to enter the defrosting mode, and when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, all the refrigerant circulation subsystems of the refrigerant circulation system enter the defrosting mode synchronously, accurately grasps the entering time of defrosting, and can avoid the situation of too long defrosting time or incomplete defrosting, thereby ensuring the stability of the heat pump unit.

[0096] Corresponding to the above-mentioned embodiments, the embodiments of the present application also provide a defrosting device of a heat pump unit, the heat pump unit comprising at least one group of refrigerant circulation systems, each group of refrigerant circulation systems comprising at least two refrigerant circulation subsystems. Figure 7 As shown in the figure, the defrosting device of the heat pump unit comprises an acquisition module 410, a determination module 420 and a first control module 430.

[0097] The acquisition module 410 is configured to acquire the heat exchanger temperature of each refrigerant circulation subsystem; the determination module 420 is configured to determine the heat exchanger temperature of each group of refrigerant circulation systems according to the heat exchanger temperature of each refrigerant circulation subsystem; and the first control module 430 is configured to control all the refrigerant circulation subsystems in the corresponding refrigerant circulation system to enter the defrosting mode synchronously when the heat exchanger temperature of at least one group of refrigerant circulation systems is less than or equal to a first preset temperature.

[0098] In some embodiments, each refrigerant circulation subsystem comprises a compressor and a four-way valve, and the first control module 430 is further configured to: reduce the frequency of all the compressors in the corresponding refrigerant circulation system to a first starting frequency synchronously, and control the flow direction of all the four-way valves in the corresponding refrigerant circulation system; and increase the frequency of all the compressors in the corresponding refrigerant circulation system synchronously.

[0099] In some embodiments, the device further comprises a second control module and a third control module, wherein the second control module is configured to, after increasing the frequency of all the compressors in the corresponding refrigerant circulation system synchronously, and when the heat exchanger temperature of the corresponding refrigerant circulation system is greater than a second preset temperature, reduce the frequency of all the compressors in the corresponding refrigerant circulation system to a second starting frequency synchronously, and control the flow direction of all the four-way valves in the corresponding refrigerant circulation system to be restored, wherein the second preset temperature is greater than the first preset temperature; and the third control module is configured to control the frequency of the corresponding compressor according to the running state of all the refrigerant circulation subsystems in the corresponding refrigerant circulation system.

[0100] In some embodiments, the device further comprises a fourth control module configured to control all the compressors in the corresponding refrigerant circulation system to operate at the upper limit frequency when the frequency of all the compressors in the corresponding refrigerant circulation system reaches the upper limit frequency and the temperature of the heat exchanger of the corresponding refrigerant circulation system is less than or equal to the second preset temperature.

[0101] In some embodiments, each refrigerant circulation subsystem comprises a fan, and the device further comprises a fifth control module configured to control all the outdoor fans in the corresponding refrigerant circulation system to stop when the frequency of each compressor in the corresponding refrigerant circulation system is synchronously reduced to the first start frequency.

[0102] In some embodiments, the device further comprises a sixth control module configured to control all the outdoor fans in the corresponding refrigerant circulation system to start when the frequency of the corresponding compressor is controlled according to the operating state of all the refrigerant circulation subsystems in the corresponding refrigerant circulation system.

[0103] In some embodiments, the first start frequency is the minimum operating frequency of the compressor.

[0104] In some embodiments, the determining module 420 is further configured to determine the smaller value among all the heat exchanger temperatures of each group of refrigerant circulation systems as the heat exchanger temperature of each group of refrigerant circulation systems.

[0105] In some embodiments, each group of refrigerant circulation systems comprises at least a refrigerant circulation subsystem, the heat exchanger of each refrigerant circulation subsystem comprises fins, and all the fins in each group of refrigerant circulation systems share a bracket.

[0106] In some embodiments, the bracket is V-shaped.

[0107] It should be noted that the specific implementation of the defrosting device of the heat pump unit in the embodiments of the present application corresponds to the specific implementation of the defrosting method of the heat pump unit in the embodiments of the present application described above, and will not be repeated here.

[0108] The defrosting device of the heat pump unit according to the embodiment of the present application obtains the heat exchanger temperature of each refrigerant circulation subsystem through the obtaining module, determines the heat exchanger temperature of each group of refrigerant circulation systems according to the heat exchanger temperature of each refrigerant circulation subsystem through the determining module, and controls all refrigerant circulation subsystems in the corresponding refrigerant circulation system to synchronously enter the defrosting mode through the first control module in the case that the heat exchanger temperature of at least one group of refrigerant circulation systems is less than or equal to the first preset temperature, wherein the heat pump unit comprises at least one group of refrigerant circulation systems, and each group of refrigerant circulation systems comprises all refrigerant circulation subsystems. Thus, the heat exchanger temperature is taken as the judgment parameter of whether to enter the defrosting mode, all refrigerant circulation subsystems in the refrigerant circulation system synchronously enter the defrosting mode when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, the entering time of the defrosting is accurately grasped, the case that the defrosting time is too long or the defrosting is not complete can be avoided, and thus the stability of the heat pump unit is ensured.

[0109] Corresponding to the above embodiment, the embodiment of the present application further provides a heat pump unit. As shown in Figure 8 and Figure 9 The heat pump unit 1000 comprises the foregoing electronic device 300 or the foregoing defrosting device 400 of the heat pump unit.

[0110] The heat pump unit according to the embodiment of the present application adopts the heat exchanger temperature as the judgment parameter of whether to enter the defrosting mode, all refrigerant circulation subsystems in the refrigerant circulation system synchronously enter the defrosting mode when the heat exchanger temperature of the refrigerant circulation system is less than or equal to the first preset temperature, the entering time of the defrosting is accurately grasped, the case that the defrosting time is too long or the defrosting is not complete can be avoided, and thus the stability of the heat pump unit is ensured.

[0111] In addition, other configurations and effects of the heat pump unit according to the embodiment of the present application are known to those skilled in the art, and to reduce redundancy, details are not described herein.

[0112] It is to be appreciated that the above description and the examples that follow are intended to be illustrative only and that changes can be made to the description and examples without departing from the scope of the application. Note also that the use of particular brand names in the description is solely for illustration and should not be construed as an endorsement of such brands.

[0113] It should be understood that aspects of the application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, can be used: a hybrid of the technologies mentioned above, discrete logic circuitry having logic gates for implementing logic functions upon data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and so forth.

[0114] In the description of the present application, reference has been made to the use of terms such as "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. The illustrative examples given are not necessarily to be construed as preferred or advantageous or with the exclusion of other equally valid examples that can be particularly adapted to a given application. Furthermore, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and operation described. Accordingly, all suitable modifications and equivalents should be included within the scope of the present application.

[0115] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0116] In addition, the terms "first", "second", and the like used in the embodiments of the present application are only for the purpose of description, and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of technical features referred to in the embodiments. Therefore, the features defined with "first", "second" and the like in the embodiments of the present application can be explicitly or implicitly indicated to include at least one of the features. In the description of the present application, the meaning of the word "plurality" is at least two or two or more, such as two, three, four, etc., unless otherwise specifically limited in the embodiments.

[0117] In the present application, unless otherwise specifically provided or limited in the embodiments, the terms "mounting", "connecting", "connecting" and "fixing" and the like appearing in the embodiments should be understood broadly, for example, the connection can be fixed connection, or detachable connection, or integral, which can be understood, or can be mechanical connection, electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific implementation situation.

[0118] In the present application, unless otherwise specifically provided and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0119] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A defrosting method for a heat pump unit, characterized in that, The heat pump unit includes at least one set of refrigerant circulation systems, each set of refrigerant circulation systems includes at least two refrigerant circulation subsystems, and the method includes: Obtain the heat exchanger temperature for each refrigerant circulation subsystem; The heat exchanger temperature of each group of refrigerant circulation systems is determined based on the heat exchanger temperature of each refrigerant circulation subsystem. When the heat exchanger temperature of at least one set of refrigerant circulation systems is less than or equal to the first preset temperature, control all refrigerant circulation subsystems in the corresponding refrigerant circulation system to simultaneously enter the defrost mode.

2. The method according to claim 1, characterized in that, Each refrigerant circulation subsystem includes a compressor and a four-way valve, wherein controlling all refrigerant circulation subsystems in the corresponding refrigerant circulation system to synchronously enter defrost mode includes: The frequency of all compressors in the corresponding refrigerant circulation system is synchronously reduced to the first starting frequency, and the reversing control of all four-way valves in the corresponding refrigerant circulation system is performed. The frequency of all compressors in the corresponding refrigerant circulation system is synchronously increased.

3. The method according to claim 2, characterized in that, After synchronizing the frequency of all compressors in the corresponding refrigerant cycle system, the method further includes: When the heat exchanger temperature of the corresponding refrigerant circulation system is greater than the second preset temperature, the frequency of all compressors in the corresponding refrigerant circulation system is synchronously reduced to the second starting frequency, and the flow direction of all four-way valves in the corresponding refrigerant circulation system is restored, wherein the second preset temperature is greater than the first preset temperature. The frequency of the corresponding compressor is controlled according to the operating status of all refrigerant circulation subsystems in the corresponding refrigerant circulation system.

4. The method according to claim 3, characterized in that, The method further includes: When the frequency of all compressors in the corresponding refrigerant circulation system reaches the upper limit frequency, and the heat exchanger temperature of the corresponding refrigerant circulation system is less than or equal to the second preset temperature, control all compressors in the corresponding refrigerant circulation system to operate at the upper limit frequency.

5. The method according to claim 3, characterized in that, Each refrigerant circulation subsystem includes a fan, and the method further includes: When the frequency of each compressor in the corresponding refrigerant circulation system is synchronously reduced to the first starting frequency, all outdoor fans in the corresponding refrigerant circulation system are controlled to stop.

6. The method according to claim 5, characterized in that, The method further includes: When the frequency of the corresponding compressor is controlled according to the operating status of all refrigerant circulation subsystems in the corresponding refrigerant circulation system, all outdoor fans in the corresponding refrigerant circulation system are controlled to start.

7. The method according to claim 2, characterized in that, The first starting frequency is the lowest operating frequency of the compressor.

8. The method according to any one of claims 1-7, characterized in that, Determining the heat exchanger temperature of each group of refrigerant circulation systems based on the heat exchanger temperature of each refrigerant circulation subsystem includes: The smaller value among all the heat exchanger temperatures corresponding to each group of refrigerant circulation systems is taken as the heat exchanger temperature of each group of refrigerant circulation systems.

9. The method according to any one of claims 1-7, characterized in that, Each refrigerant circulation system includes two refrigerant circulation subsystems. The heat exchanger of each refrigerant circulation subsystem includes fins, and all fins in each refrigerant circulation system share a common support.

10. The method according to claim 9, characterized in that, The bracket is V-shaped.

11. A computer-readable storage medium, characterized in that, It stores a computer program, which, when processed by a processor, executes the defrosting method of the heat pump unit as described in any one of claims 1-10.

12. An electronic device, characterized in that, The device includes a memory, a processor, and a defrosting program for a heat pump unit stored in the memory and executable on the processor. When the processor executes the defrosting program for the heat pump unit, it implements the defrosting method for the heat pump unit according to any one of claims 1-10.

13. A defrosting device for a heat pump unit, characterized in that, The heat pump unit includes at least one set of refrigerant circulation systems, each set of refrigerant circulation systems includes at least two refrigerant circulation subsystems, and the device includes: The acquisition module is used to acquire the heat exchanger temperature of each refrigerant circulation subsystem; The determination module is used to determine the heat exchanger temperature of each group of refrigerant circulation systems based on the heat exchanger temperature of each refrigerant circulation subsystem. The first control module is used to control all refrigerant circulation subsystems in the corresponding refrigerant circulation system to simultaneously enter the defrost mode when the heat exchanger temperature of at least one group of refrigerant circulation systems is less than or equal to the first preset temperature.

14. A heat pump unit, characterized in that, include: The electronic device according to claim 12 or the defrosting device for the heat pump unit according to claim 13.

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