Defrosting control method and device of heat pump unit and heat pump unit

Abstract

The application provides a defrosting control method, a control device and a heat pump unit. The defrosting control method of the heat pump unit comprises the following steps: determining that the heat pump unit is in a heating mode, obtaining the inlet water temperature and the outlet water temperature of a hot water pipe of the heat pump unit; determining that the inlet water temperature and the outlet water temperature satisfy a first set condition, obtaining a change parameter of an operating parameter of the heat pump unit within a set time; determining that the change parameter satisfies a second set condition, and controlling the heat pump unit to enter a special defrosting mode. The application provides a defrosting control method, a control device and a heat pump unit, which can fundamentally solve the defrosting problem under different water temperatures, improve the defrosting effect of the condenser, and further improve the heating capacity of the unit and the user experience.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to a defrosting control method, control device, and heat pump unit for heat pump units. Background Technology

[0002] With the expansion of the heat pump water heater market and the increasing popularity of these products, their heating performance has received much attention. When the unit operates in low outdoor ambient temperatures, especially during the initial heating phase, the normal defrosting logic often results in incomplete defrosting of the outdoor unit's condenser or even continuous icing on the condenser, thus affecting the unit's heating operation and user experience. Summary of the Invention

[0003] This invention provides a defrosting control method, control device, and heat pump unit for heat pump units, which addresses the deficiencies in the prior art and achieves the following technical effects: fundamentally solving the defrosting problem at different water temperatures, improving the unit's heating capacity by enhancing the defrosting effect of the condenser, and improving the user experience.

[0004] A defrosting control method for a heat pump unit according to a first aspect embodiment of the present invention includes:

[0005] Determine that the heat pump unit is in heating mode, and obtain the inlet and outlet water temperatures of the hot water pipes of the heat pump unit;

[0006] Determine that the inlet water temperature and the outlet water temperature meet the first set condition, and obtain the change parameters of the operating parameters of the heat pump unit within a set time period, wherein the first set condition is that it is within a set temperature range.

[0007] Once the changed parameters are determined to meet the second set condition, the heat pump unit is controlled to enter a special defrosting mode, whereby the second set condition is that the parameters are within a set range of change.

[0008] According to an embodiment of the present invention, in the step of determining that the inlet water temperature and the outlet water temperature meet a first set condition and obtaining the change parameters of the operating parameters of the heat pump unit within a set time:

[0009] The first setting condition includes that the minimum value between the inlet water temperature and the outlet water temperature is less than the first set temperature.

[0010] According to one embodiment of the present invention, the varying parameters include the rate of pressure drop of the compressor's high pressure and / or low pressure after a set time.

[0011] In the step of determining that the changed parameters meet the second set condition and controlling the heat pump unit to enter a special defrosting mode, the second set condition includes that the pressure drop rate of the compressor's high pressure and / or low pressure after a set time is greater than or equal to the set pressure drop rate.

[0012] According to one embodiment of the present invention, the varying parameters include the rate of temperature decrease of the compressor's exhaust temperature and / or intake temperature after a set time.

[0013] In the step of determining that the changing parameters meet the second set condition and controlling the heat pump unit to enter a special defrosting mode, the second set condition includes that the temperature drop rate of the compressor's exhaust temperature and / or suction temperature after a set time is greater than or equal to the set temperature drop rate.

[0014] According to one embodiment of the present invention, the variable parameter includes the defrosting temperature of the condenser after a set time;

[0015] In the step of determining that the changed parameters meet the second set condition and controlling the heat pump unit to enter a special defrosting mode, the second set condition includes that the defrosting temperature of the condenser after a set time is less than the set defrosting temperature.

[0016] According to an embodiment of the present invention, the step of controlling the heat pump unit to enter a special defrosting mode specifically includes:

[0017] In the special defrost mode, the defrost time is extended from the original time to a special defrost time.

[0018] According to an embodiment of the present invention, in the step of extending the defrosting time to a special defrosting time based on the original time: the special defrosting time is determined according to the changed parameters;

[0019] The changing parameters include at least one of the following: the rate of pressure drop of the compressor's high pressure and / or low pressure after a set time; the rate of temperature drop of the compressor's discharge temperature and / or suction temperature after a set time; and the defrost temperature of the condenser after a set time.

[0020] The specific defrosting duration is positively correlated with the pressure drop rate and the temperature drop rate, respectively, and the specific defrosting duration is negatively correlated with the defrosting temperature.

[0021] According to an embodiment of the present invention, the step of controlling the heat pump unit to enter a special defrosting mode further includes:

[0022] In the special defrosting mode, the defrosting frequency of the compressor is increased from the original frequency to the special defrosting frequency.

[0023] According to an embodiment of the present invention, in the step of increasing the defrosting frequency of the compressor from the original frequency to a special defrosting frequency: the special defrosting frequency is determined according to the changed parameters;

[0024] The changing parameters include at least one of the following: the rate of pressure drop of the compressor's high pressure and / or low pressure after a set time; the rate of temperature drop of the compressor's discharge temperature and / or suction temperature after a set time; and the defrost temperature of the condenser after a set time.

[0025] The specific defrosting frequency is positively correlated with the pressure drop rate and the temperature drop rate, respectively, and the specific defrosting frequency is negatively correlated with the defrosting temperature.

[0026] A defrosting control device for a heat pump unit according to a second aspect embodiment of the present invention includes:

[0027] The first acquisition module is used to determine that the heat pump unit is in heating mode and to acquire the inlet and outlet water temperatures of the hot water pipes of the heat pump unit.

[0028] The second acquisition module is used to determine that the inlet water temperature and the outlet water temperature meet the first set condition, and to acquire the change parameters of the operating parameters of the heat pump unit within a set time, wherein the first set condition is that it is within a set temperature range.

[0029] The control module is used to determine that the changed parameters meet a second set condition, and control the heat pump unit to enter a special defrosting mode, wherein the second set condition is that it is within a set range of change.

[0030] A heat pump unit according to a third aspect of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the defrosting control method for the heat pump unit as described in the first aspect of the present invention.

[0031] This invention provides a defrosting control method for heat pump units. This method intelligently determines the defrosting mode based on the unit's operating parameters through full system parameter detection, and intelligently selects between normal and special defrosting modes based on the water system temperature. This fundamentally solves the defrosting problem at different water temperatures, improves the unit's heating capacity by enhancing the condenser defrosting effect, and improves the user experience. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic flowchart of the defrosting control method for heat pump units provided by the present invention;

[0034] Figure 2 This is a schematic diagram of the defrosting control device for the heat pump unit provided by the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the heat pump unit provided by the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0037] Figure label:

[0038] 1. Compressor; 2. Four-way valve; 3. Indoor heat exchanger; 4. Electronic expansion valve; 5. Outdoor heat exchanger; 6. Hot water pipe; 7. Exhaust temperature sensor; 8. Intake temperature sensor; 9. Low-pressure sensor; 10. High-pressure sensor; 11. Ambient temperature sensor; 110. First acquisition module; 120. Second acquisition module; 130. Control module. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0040] The defrosting control method, control device, and heat pump unit of the present invention are described below with reference to the accompanying drawings. Before detailing the embodiments of the present invention, the overall application scenario is described first. The defrosting control method, control device, electronic device, and computer-readable storage medium of the heat pump unit of the present invention can be applied to local air conditioning systems, cloud platforms in the Internet field, or other types of cloud platforms in the Internet field, or to third-party devices. These third-party devices may include various types such as mobile phones, tablets, laptops, in-vehicle computers, and other smart terminals.

[0041] The following description uses only the defrosting control method applicable to heat pump units as an example. It should be understood that the control method of this invention can also be applied to cloud platforms and third-party devices. It should also be noted that the air conditioning control method proposed in this invention is targeted, meaning that this method is primarily aimed at the heating mode of heat pump units.

[0042] Before introducing the defrosting control method of the present invention, a brief description of the structure of the heat pump unit on which the method is based is given: as follows Figure 3 As shown, the heat pump unit includes an indoor heat exchanger 3, a four-way valve 2, a compressor 1, an outdoor heat exchanger 5, and an electronic expansion valve 4, all interconnected via refrigerant pipes. The heat pump unit also includes a hot water pipe 6, which is used for water inlet, heating, and outlet. The hot water pipe 6 includes an inlet pipe, a heating pipe, and an outlet pipe. The heating pipe is positioned opposite the indoor heat exchanger 3, which heats the heating pipe to produce hot water.

[0043] like Figure 1 As shown, the defrosting control method for a heat pump unit according to a first aspect embodiment of the present invention includes:

[0044] Step S1: Determine that the heat pump unit is in heating mode, and obtain the inlet and outlet water temperatures of the hot water pipe 6 of the heat pump unit.

[0045] Step S2: Determine that the inlet water temperature and outlet water temperature meet the first set condition, and obtain the change parameters of the heat pump unit's operating parameters within a set time period. The first set condition is that the temperature is within the set temperature range.

[0046] Step S3: Determine that the changed parameters meet the second set condition, and control the heat pump unit to enter a special defrosting mode. The second set condition is that it is within the set change range.

[0047] According to the defrosting control method of the heat pump unit of the present invention, the specific working process is as follows: When the heat pump unit is turned on, when the controller determines that the heat pump unit is in heating mode, the controller will further obtain the inlet water temperature and outlet water temperature of the hot water pipe 6 of the heat pump unit, and analyze and judge the inlet water temperature and outlet water temperature. When it is determined that the inlet water temperature and outlet water temperature meet the first set condition, for example, the first set condition can be that at least one of the inlet water temperature and outlet water temperature is lower, at this time, due to the low initial water temperature, the normal defrosting logic will often cause the outdoor unit condenser to be not defrosted cleanly or even the condenser to continue to freeze, thereby affecting the heating operation of the unit and the user experience. That is, when the inlet water temperature and outlet water temperature meet the first set condition, the risk of frosting of the outdoor heat exchanger 5 is greater.

[0048] Therefore, after the judgment condition in step S2 is met, in order to further judge the risk of frost formation on the outdoor heat exchanger 5, this method will further obtain the change parameters of the heat pump unit's operating parameters within a set time. When the change parameters of the heat pump unit's operating parameters within a set time meet the second set condition, it proves that the outdoor heat exchanger 5 has already frostted or even that the frost formation is severe. Therefore, the controller will directly control the unit to enter a special defrosting mode. In this special defrosting mode, the controller will enhance the defrosting effect by extending the defrosting time or increasing the defrosting frequency, ensuring that the outdoor heat exchanger 5 defrosts completely, thereby ensuring the normal heating of the heat pump unit.

[0049] Specifically, the controller can acquire the operating parameters of the compressor 1 of the heat pump unit, such as high pressure, low pressure, suction temperature, and exhaust temperature, and statistically analyze their changes over a set time period to generate change parameters. It can be understood that the change parameters of the heat pump unit's operating parameters over a set time period can reflect the changes in the operating status of the heat pump unit, and thus indirectly reflect the frosting situation of the outdoor heat exchanger 5. That is, when the rate of change of the heat pump unit's operating parameters after the set time period is large, it proves that as heating continues, the frosting situation of the outdoor heat exchanger 5 becomes more and more serious, thus causing large fluctuations in the operating parameters of the heat pump unit.

[0050] For example, if the rate of change of the high pressure and / or low pressure of compressor 1 after a set time is too large, or if the rate of change of the suction temperature and / or discharge temperature of compressor 1 after a set time is too large, it indicates that the outdoor heat exchanger 5 is severely frosted. Therefore, the controller needs to activate a special defrosting mode to perform enhanced defrosting operation on the outdoor heat exchanger 5, ensuring that the outdoor heat exchanger 5 is completely defrosted and ensuring the normal heating effect of the heat pump unit.

[0051] In related technologies, with the expansion of the current heat pump water heater market and the popularization of products, their heating performance has received much attention. When the unit operates for heating in low outdoor ambient temperatures, especially during the initial heating, the normal defrosting logic often results in incomplete defrosting of the outdoor unit condenser or even continuous icing of the condenser due to the low initial water temperature, which in turn affects the unit's heating operation and user experience.

[0052] To address the technical deficiencies in the aforementioned related technologies, this invention provides a defrosting control method for heat pump units. This method intelligently determines the defrosting mode based on the unit's operating parameters through full system parameter detection, and intelligently selects between normal and special defrosting modes based on the water system temperature. This fundamentally solves the defrosting problem at different water temperatures, improves the unit's heating capacity by enhancing the condenser defrosting effect, and improves the user experience.

[0053] According to some embodiments of the present invention, in the step of determining that the inlet water temperature and the outlet water temperature meet the first set condition and obtaining the change parameters of the operating parameters of the heat pump unit within a set time:

[0054] The first setting condition includes the minimum value between the inlet water temperature and the outlet water temperature being less than the first set temperature.

[0055] That is, the controller will determine that the outdoor heat exchanger 5 has a high risk of frosting only when the minimum of the inlet water temperature and the outlet water temperature is less than the first set temperature. Then, it will continue to acquire the change parameters of the heat pump unit's operating parameters within the set time to further determine the frosting situation of the outdoor heat exchanger 5.

[0056] Furthermore, when the controller determines that the inlet water temperature and the outlet water temperature do not meet the first set condition, that is, when the minimum value between the inlet water temperature and the outlet water temperature is greater than or equal to the first set temperature, the controller controls the heat pump unit to enter the normal defrosting mode.

[0057] For example, the first set temperature can be 20℃. In this case, when the minimum of the inlet and outlet water temperatures is greater than or equal to 20℃, the unit operates in normal defrost mode. The heat pump unit determines the condenser frosting status based on Te = α * Tao + β, where Te is the defrost temperature of the outdoor heat exchanger 5, Tao is the outdoor ambient temperature, and α and β are constants, typically α = 1 and β = -10. When the defrost temperature Te of the outdoor heat exchanger 5 is less than the set value, the heat pump unit performs normal defrost.

[0058] When the minimum of the inlet and outlet water temperatures is less than 20°C, the outdoor heat exchanger 5 may be severely frosted. Therefore, in order to accurately determine the current frosting condition of the outdoor heat exchanger 5, the controller will further acquire the changing parameters of the heat pump unit's operating parameters and determine the frosting condition of the outdoor heat exchanger 5 through the changing parameters. When the changing parameters meet the second set condition, it proves that the outdoor heat exchanger 5 is severely frosted. Therefore, in order to ensure that the outdoor heat exchanger 5 is completely defrosted, the heat pump unit enters a special defrosting mode to perform enhanced defrosting operation on the outdoor heat exchanger 5.

[0059] According to some embodiments of the present invention, the variable parameters include the rate of pressure drop of the high pressure and / or low pressure of compressor 1 after a set time.

[0060] In the step of determining that the changed parameters meet the second set condition and controlling the heat pump unit to enter the special defrosting mode, the second set condition includes that the pressure drop rate of the high pressure and / or low pressure of the compressor 1 after a set time is greater than or equal to the set pressure drop rate.

[0061] In this embodiment, the controller acquires the pressure change parameters of the compressor 1, that is, the pressure drop rate of the high pressure and / or low pressure of the compressor 1 after a set time, and judges the frosting condition of the outdoor heat exchanger 5 by the pressure change rate. Specifically, when the pressure change rate is too large, that is, when the high pressure and / or low pressure fluctuate greatly, it proves that the outdoor heat exchanger 5 is severely frosted, and the heat pump unit enters a special defrosting mode.

[0062] It is understandable that as the heat pump unit continues its heating process, the degree of frost formation on the outdoor heat exchanger 5 will become more and more severe. At this time, both the high pressure and low pressure of the compressor 1 will fluctuate and decrease to varying degrees. If the pressure drop rate of the above pressure parameters is small, it indicates that the degree of frost formation on the outdoor heat exchanger 5 is relatively mild. If the pressure drop rate of the above pressure parameters is too large, it indicates that the degree of frost formation on the outdoor heat exchanger 5 is relatively severe.

[0063] According to other embodiments of the present invention, the variable parameters include the rate of temperature decrease of the compressor 1's exhaust temperature and / or intake temperature after a set time.

[0064] In the step of determining that the changing parameters meet the second set condition and controlling the heat pump unit to enter the special defrosting mode, the second set condition includes that the temperature drop rate of the compressor 1's exhaust temperature and / or suction temperature after a set time is greater than or equal to the set temperature drop rate.

[0065] In this embodiment, the controller acquires the temperature change parameters of the compressor 1, that is, the temperature drop rate of the compressor 1's exhaust temperature and / or suction temperature after a set time, and judges the frosting condition of the outdoor heat exchanger 5 by the temperature drop rate. Specifically, when the temperature drop rate is too large, that is, when the exhaust temperature and / or suction temperature fluctuates greatly, it proves that the outdoor heat exchanger 5 is severely frosted, and the heat pump unit enters a special defrosting mode.

[0066] It is understandable that as the heat pump unit continues its heating process, the degree of frost formation on the outdoor heat exchanger 5 will become more and more severe. At this time, the exhaust temperature and intake temperature of the compressor 1 will fluctuate and decrease to varying degrees. If the temperature drop rate of the above temperature parameters is small, it indicates that the degree of frost formation on the outdoor heat exchanger 5 is relatively mild. If the temperature drop rate of the above temperature parameters is too large, it indicates that the degree of frost formation on the outdoor heat exchanger 5 is relatively severe.

[0067] According to some embodiments of the present invention, the variable parameters include the defrosting temperature of the condenser after a set time.

[0068] In the step of determining that the changed parameters meet the second set condition and controlling the heat pump unit to enter the special defrost mode, the second set condition includes that the defrost temperature of the condenser is lower than the set defrost temperature after a set time.

[0069] The system determines the defrost temperature of the condenser (i.e., the outdoor heat exchanger 5) by Te = α * Tao + β, where Te is the defrost temperature of the condenser (i.e., the outdoor heat exchanger 50), Tao is the outdoor ambient temperature, and α and β are constants, typically α = 1 and β = -10.

[0070] It is understandable that the lower the defrost temperature of the condenser, the lower the outdoor heat exchange temperature. At this time, the degree of frost on the outdoor heat exchanger 5 is also more serious. Therefore, the heat pump unit enters a special defrost mode to achieve thorough defrosting of the outdoor heat exchanger 5 through enhanced defrost operation, ensuring the heating effect of the heat pump unit and improving the user experience.

[0071] According to some embodiments of the present invention, when the unit performs special defrosting, since the water temperature flowing in the hot water pipe 6 of the heat pump unit is low, it is necessary to strengthen the defrosting mode, that is, to extend the defrosting time, increase the defrosting frequency and other special treatment measures.

[0072] In some embodiments of the present invention, the step of controlling the heat pump unit to enter a special defrosting mode specifically includes:

[0073] In the special defrost mode, the defrost time is extended from the original time to a special defrost time.

[0074] In this way, by extending the defrosting time, the outdoor heat exchanger 5, which has a more severe degree of frost, can be fully defrosted. During the longer defrosting process, a large amount of frost or ice can be completely eliminated, avoiding the residue of frost or ice on the outdoor heat exchanger 5 and ensuring the heating effect of the heat pump unit.

[0075] Furthermore, in the step of extending the defrosting time from the original time to a special defrosting time, the special defrosting time is determined based on the changing parameters.

[0076] Specifically, the variable parameters include at least one of the following: the pressure drop rate of the high-pressure and / or low-pressure of compressor 1 after a set time; the temperature drop rate of the discharge temperature and / or suction temperature of compressor 1 after a set time; and the defrost temperature of the condenser after a set time. The specific defrost duration is positively correlated with both the pressure drop rate and the temperature drop rate, and negatively correlated with the defrost temperature.

[0077] For example, if the pressure drop rate or temperature drop rate is within the first range, the special defrosting time is the first defrosting time; if the pressure drop rate or temperature drop rate is within the second range, the special defrosting time is the second defrosting time; if the pressure drop rate or temperature drop rate is within the third range, the special defrosting time is the third defrosting time.

[0078] If the first interval is larger than the second interval, and the second interval is larger than the third interval, then the first defrosting time is greater than the second defrosting time, and the second defrosting time is greater than the third defrosting time.

[0079] For example, if the defrost temperature is in the first temperature range, the special defrost time is the first duration; if the defrost temperature is in the second temperature range, the special defrost time is the second duration; if the defrost temperature is in the third temperature range, the special defrost time is the third duration.

[0080] If the first temperature range is greater than the second temperature range, and the second temperature range is greater than the third temperature range, then the first duration is less than the second duration, and the second duration is less than the third duration.

[0081] In other embodiments of the present invention, the step of controlling the heat pump unit to enter a special defrosting mode further includes:

[0082] In the special defrosting mode, the defrosting frequency of compressor 1 is increased from the original frequency to the special defrosting frequency.

[0083] In this way, by increasing the defrosting frequency, the outdoor heat exchanger 5, which has a more severe degree of frost buildup, can be fully defrosted. During the longer defrosting process, a large amount of frost or ice can be completely eliminated, avoiding the residue of frost or ice on the outdoor heat exchanger 5 and ensuring the heating effect of the heat pump unit.

[0084] Furthermore, in the step of increasing the defrosting frequency of compressor 1 from the original frequency to a special defrosting frequency: the special defrosting frequency is determined based on the changing parameters.

[0085] Specifically, the variable parameters include at least one of the following: the pressure drop rate of the high pressure and / or low pressure of compressor 1 after a set time; the temperature drop rate of the discharge temperature and / or suction temperature of compressor 1 after a set time; and the defrost temperature of the condenser after a set time. The specific defrost frequency is positively correlated with the pressure drop rate and the temperature drop rate, respectively, and the specific defrost frequency is negatively correlated with the defrost temperature.

[0086] For example, if the pressure drop rate or temperature drop rate is within the first range, the special defrosting frequency is the first defrosting frequency; if the pressure drop rate or temperature drop rate is within the second range, the special defrosting frequency is the second defrosting frequency; if the pressure drop rate or temperature drop rate is within the third range, the special defrosting frequency is the third defrosting frequency.

[0087] If the first interval is larger than the second interval, and the second interval is larger than the third interval, then the first defrosting frequency is greater than the second defrosting frequency, and the second defrosting frequency is greater than the third defrosting frequency.

[0088] For example, if the defrost temperature is in the first temperature range, the special defrost frequency is the first frequency; if the defrost temperature is in the second temperature range, the special defrost frequency is the second frequency; if the defrost temperature is in the third temperature range, the special defrost frequency is the third frequency.

[0089] If the first temperature range is greater than the second temperature range, and the second temperature range is greater than the third temperature range, then the first frequency is less than the second frequency, and the second frequency is less than the third frequency.

[0090] The defrosting control device for the heat pump unit provided by the present invention is described below. The defrosting control device for the heat pump unit described below can be referred to in correspondence with the defrosting control method for the heat pump unit described above.

[0091] like Figure 2 As shown, a defrosting control device for a heat pump unit according to a second aspect embodiment of the present invention includes:

[0092] The first acquisition module 110 is used to determine that the heat pump unit is in heating mode and to acquire the inlet and outlet water temperatures of the hot water pipe 6 of the heat pump unit.

[0093] The second acquisition module 120 is used to determine that the inlet water temperature and the outlet water temperature meet the first set condition, and to acquire the change parameters of the heat pump unit's operating parameters within a set time period, wherein the first set condition is that it is within a set temperature range.

[0094] The control module 130 is used to determine that the changing parameters meet the second set condition and control the heat pump unit to enter a special defrosting mode, wherein the second set condition is that it is within the set change range.

[0095] like Figure 3 As shown, the heat pump unit according to a third aspect embodiment of the present invention includes a defrosting control device for the heat pump unit according to the second aspect embodiment of the present invention, and further includes an indoor heat exchanger 3, a four-way valve 2, a compressor 1, an outdoor heat exchanger 5, and an electronic expansion valve 4 interconnected by refrigerant pipes. The heat pump unit also includes a hot water pipe 6, which is used for water inlet, heating, and water outlet. The hot water pipe 6 includes an inlet pipe, a heating pipe, and an outlet pipe. The heating pipe is disposed opposite to the indoor heat exchanger 3, and the indoor heat exchanger 3 is used to heat the heating pipe to generate hot water.

[0096] According to the embodiments of the present invention, the heat pump unit and its defrosting control device intelligently determine the defrosting mode based on the unit's operating parameters through the detection of all system parameters, and intelligently select the normal defrosting mode or the special defrosting mode based on the water system temperature, thereby fundamentally solving the defrosting problem under different water temperatures, improving the unit's heating capacity by improving the defrosting effect of the condenser, and enhancing the user experience.

[0097] like Figure 3As shown, according to some embodiments of the present invention, the compressor 1 has an intake port equipped with an intake temperature sensor 8 and a low-pressure sensor 9, and an exhaust port equipped with an exhaust temperature sensor 7 and a high-pressure sensor 10. An ambient temperature sensor 11 is also provided outside the outdoor heat exchanger 5.

[0098] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 can call logical instructions in the memory 830 to execute a defrosting control method for the heat pump unit, including: determining that the heat pump unit is in heating mode; acquiring the inlet and outlet water temperatures of the hot water pipe 6 of the heat pump unit; determining that the inlet and outlet water temperatures meet a first set condition; acquiring the change parameters of the heat pump unit's operating parameters within a set time period, wherein the first set condition is that the operating parameters are within a set temperature range; determining that the change parameters meet a second set condition; and controlling the heat pump unit to enter a special defrosting mode, wherein the second set condition is that the operating parameters are within a set change range.

[0099] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0100] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute a defrosting control method for a heat pump unit, including: determining that the heat pump unit is in heating mode; acquiring the inlet and outlet water temperatures of the hot water pipe 6 of the heat pump unit; determining that the inlet and outlet water temperatures meet a first set condition; acquiring the change parameters of the operating parameters of the heat pump unit within a set time period, wherein the first set condition is that the operating parameters are within a set temperature range; determining that the change parameters meet a second set condition; and controlling the heat pump unit to enter a special defrosting mode, wherein the second set condition is that the operating parameters are within a set change range.

[0101] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a defrosting control method for a heat pump unit, comprising: determining that the heat pump unit is in heating mode; acquiring the inlet and outlet water temperatures of the hot water pipe 6 of the heat pump unit; determining that the inlet and outlet water temperatures meet a first set condition; acquiring the change parameters of the operating parameters of the heat pump unit within a set time period, wherein the first set condition is that the operating parameters are within a set temperature range; determining that the change parameters meet a second set condition; and controlling the heat pump unit to enter a special defrosting mode, wherein the second set condition is that the operating parameters are within a set change range.

[0102] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0103] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defrosting control method for a heat pump unit, characterized in that, include: Determine that the heat pump unit is in heating mode, and obtain the inlet and outlet water temperatures of the hot water pipes of the heat pump unit; Determine that the inlet water temperature and the outlet water temperature meet the first set condition, and obtain the change parameters of the operating parameters of the heat pump unit within a set time period, wherein the first set condition is that it is within a set temperature range. If the changing parameters are determined to meet the second set condition, the heat pump unit is controlled to enter a special defrost mode, where the second set condition is that it is within a set change range; wherein, in the special defrost mode, the defrost frequency of the compressor is controlled to increase from the original frequency to a special defrost frequency; the special defrost frequency is determined according to the changing parameters; In the step of determining that the inlet water temperature and the outlet water temperature meet the first preset condition, and obtaining the change parameters of the operating parameters of the heat pump unit within a set time: The first setting condition includes that the minimum value between the inlet water temperature and the outlet water temperature is less than the first set temperature.

2. The defrosting control method for a heat pump unit according to claim 1, characterized in that, The changing parameters include the rate of pressure drop of the compressor's high-pressure and / or low-pressure after a set time. In the step of determining that the changed parameters meet the second set condition and controlling the heat pump unit to enter a special defrosting mode, the second set condition includes that the pressure drop rate of the compressor's high pressure and / or low pressure after a set time is greater than or equal to the set pressure drop rate.

3. The defrosting control method for a heat pump unit according to claim 1, characterized in that, The changing parameters include the rate of temperature decrease of the compressor's exhaust temperature and / or intake temperature after a set time. In the step of determining that the changing parameters meet the second set condition and controlling the heat pump unit to enter a special defrosting mode, the second set condition includes that the temperature drop rate of the compressor's exhaust temperature and / or suction temperature after a set time is greater than or equal to the set temperature drop rate.

4. The defrosting control method for a heat pump unit according to claim 1, characterized in that, The variable parameters include the defrosting temperature of the condenser after a set time; In the step of determining that the changed parameters meet the second set condition and controlling the heat pump unit to enter a special defrosting mode, the second set condition includes that the defrosting temperature of the condenser after a set time is less than the set defrosting temperature.

5. The defrosting control method for a heat pump unit according to any one of claims 1 to 4, characterized in that, The steps for controlling the heat pump unit to enter the special defrosting mode specifically include: In the special defrost mode, the defrost time is extended from the original time to a special defrost time.

6. The defrosting control method for a heat pump unit according to claim 5, characterized in that, In the step of extending the defrosting time from the original time to a special defrosting time: the special defrosting time is determined according to the changed parameters; The changing parameters include at least one of the following: the rate of pressure drop of the compressor's high pressure and / or low pressure after a set time; the rate of temperature drop of the compressor's discharge temperature and / or suction temperature after a set time; and the defrost temperature of the condenser after a set time. The specific defrosting duration is positively correlated with the pressure drop rate and the temperature drop rate, respectively, and the specific defrosting duration is negatively correlated with the defrosting temperature.

7. The defrosting control method for a heat pump unit according to claim 1, characterized in that, The changing parameters include at least one of the following: the rate of pressure drop of the compressor's high pressure and / or low pressure after a set time; the rate of temperature drop of the compressor's discharge temperature and / or suction temperature after a set time; and the defrost temperature of the condenser after a set time. The specific defrosting frequency is positively correlated with the pressure drop rate and the temperature drop rate, respectively, and the specific defrosting frequency is negatively correlated with the defrosting temperature.

8. A defrosting control device for a heat pump unit, characterized in that, include: The first acquisition module is used to determine that the heat pump unit is in heating mode and to acquire the inlet and outlet water temperatures of the hot water pipes of the heat pump unit. The second acquisition module is used to determine that the inlet water temperature and the outlet water temperature meet the first set condition, and to acquire the change parameters of the operating parameters of the heat pump unit within a set time, wherein the first set condition is that it is within a set temperature range. The control module is used to determine that the changing parameters meet a second set condition, and control the heat pump unit to enter a special defrost mode, wherein the second set condition is that it is within a set change range; wherein, in the special defrost mode, the defrost frequency of the compressor is controlled to increase from the original frequency to a special defrost frequency; the special defrost frequency is determined according to the changing parameters; In the step of determining that the inlet water temperature and the outlet water temperature meet the first preset condition, and obtaining the change parameters of the operating parameters of the heat pump unit within a set time: The first setting condition includes that the minimum value between the inlet water temperature and the outlet water temperature is less than the first set temperature.

9. A heat pump unit, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the defrosting control method for the heat pump unit as described in any one of claims 1 to 7.

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