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

Abstract

The invention provides a defrosting control method and device of a heat pump unit and the heat pump unit. The defrosting control method of the heat pump unit comprises the steps that it is determined that the heat pump unit is in a heating mode, and the water inlet temperature and the water outlet temperature of a hot water pipe of the heat pump unit are obtained; determining that the water inlet temperature and the water outlet temperature meet a first set condition, and obtaining change parameters of working parameters of the heat pump unit within set time; and determining that the change parameter meets a second set condition, and controlling the heat pump unit to enter a special defrosting mode. According to the defrosting control method and device of the heat pump unit and the heat pump unit, the defrosting problem at different water temperatures can be fundamentally solved, the heating capacity of the unit is improved by improving the defrosting effect of the condenser, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and in particular to a defrosting control method and a control device for a heat pump unit and a heat pump unit. Background Art

[0002] With the current expansion of the heat pump water heater market and the popularization of products, its heating performance has attracted much attention. When the unit is running for heating at a low outdoor ambient temperature, especially for the first time, due to the low initial water temperature, the normal defrosting logic often causes the outdoor unit condenser to be defrosted incompletely or even the condenser to continue to freeze, thus affecting the unit's heating operation and user experience. Summary of the invention

[0003] The present invention provides a defrost control method, a control device and a heat pump unit for a heat pump unit, which are used to solve the defects in the prior art and achieve the following technical effects: fundamentally solving the defrosting problem under different water temperatures, improving the heating capacity of the unit by improving the defrosting effect of the condenser, and improving the user experience.

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

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

[0006] Determine that the water inlet temperature and the water outlet temperature meet a first setting condition, and obtain a change parameter of the working parameter of the heat pump unit within a set time, wherein the first setting condition is that the working parameter is within a set temperature range;

[0007] It is determined that the variation parameter satisfies a second setting condition, and the heat pump unit is controlled to enter a special defrosting mode, wherein the second setting condition is that the variation parameter is within a set variation range.

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

[0010] According to one embodiment of the present invention, the variable parameter includes a pressure drop rate of the high pressure and / or low pressure of the compressor after a set period of time;

[0011] In the step of determining that the change parameter satisfies the second set condition and controlling the heat pump unit to enter a special defrost mode, the second set condition includes that the pressure drop rate of the high pressure and / or low pressure of the compressor after a set period of time is greater than or equal to the set pressure drop rate.

[0012] According to one embodiment of the present invention, the change parameter includes the temperature drop rate of the exhaust temperature and / or the suction temperature of the compressor after a set period of time;

[0013] In the step of determining that the change parameter satisfies the second set condition and controlling the heat pump unit to enter a special defrost mode, the second set condition includes that the temperature drop rate of the exhaust temperature and / or the suction temperature of the compressor after a set period of 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 defrost temperature of the condenser after a set period of time;

[0015] In the step of determining that the change parameter satisfies a second set condition and controlling the heat pump unit to enter a special defrost mode, the second set condition includes that the defrost temperature of the condenser after a set period of time is less than a set defrost temperature.

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

[0017] In the special defrost mode, the defrost time is controlled to be extended to the special defrost time based on the original time.

[0018] According to one embodiment of the present invention, in the step of controlling the defrost duration to be extended to a special defrost duration based on the original duration: determining the special defrost duration according to the change parameter;

[0019] The change parameter includes at least one of a pressure drop rate of the high pressure and / or low pressure of the compressor after a set time, a temperature drop rate of the exhaust temperature and / or suction temperature of the compressor after a set time, and a defrost temperature of the condenser after a set time;

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

[0021] According to one embodiment of the present invention, the step of controlling the heat pump unit to enter the special defrost mode specifically further includes:

[0022] In the special defrost mode, the defrost frequency of the compressor is controlled to increase to the special defrost frequency based on the original frequency.

[0023] According to one embodiment of the present invention, in the step of controlling the defrost frequency of the compressor to increase to a special defrost frequency based on the original frequency: determining the special defrost frequency according to the change parameter;

[0024] The change parameter includes at least one of a pressure drop rate of the high pressure and / or low pressure of the compressor after a set time, a temperature drop rate of the exhaust temperature and / or suction temperature of the compressor after a set time, and a defrost temperature of the condenser after a set time;

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

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

[0027] The first acquisition module is used to determine whether the heat pump unit is in heating mode and obtain the water inlet temperature and water outlet temperature of the hot water pipe of the heat pump unit;

[0028] A second acquisition module is used to determine that the water inlet temperature and the water outlet temperature meet a first setting condition, and to obtain a change parameter of the working parameter of the heat pump unit within a set time, wherein the first setting condition is that the working parameter is within a set temperature range;

[0029] The control module is used to determine that the change parameter meets a second setting condition and control the heat pump unit to enter a special defrosting mode, wherein the second setting condition is that the change parameter is within a set change range.

[0030] According to an embodiment of the third aspect of the present invention, a heat pump unit includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the defrost control method for the heat pump unit as described in the embodiment of the first aspect of the present invention is implemented.

[0031] The present invention provides a defrost control method for a heat pump unit. The method detects the parameters of the entire system, intelligently determines the defrost mode from the operating parameters of the unit, and intelligently selects the normal defrost mode or the special defrost mode according to the temperature of the water system, thereby fundamentally solving the defrosting problem under different water temperatures, improving the heating capacity of the unit by improving the defrosting effect of the condenser, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a flow chart of the defrosting control method of the heat pump unit provided by the present invention;

[0034] Figure 2 It is a structural schematic diagram of the defrost control device of the heat pump unit provided by the present invention;

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

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

[0037] Reference numerals:

[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 DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The defrost control method, control device and heat pump unit of the heat pump unit proposed in the present invention are described below with reference to the accompanying drawings. Among them, before the embodiment of the present invention is described in detail, the entire application scenario is first described. The defrost control method, control device, electronic device and computer-readable storage medium of the heat pump unit of the embodiment of the present invention can be applied to the air conditioner locally, and can also be applied to the cloud platform in the Internet field, or other types of cloud platforms in the Internet field, or can also be applied to third-party devices. Among them, the third-party device may include many different types such as mobile phones, tablet computers, notebooks, car computers and other smart terminals.

[0041] The following is only an example of a defrosting control method applicable to a heat pump unit. It should be understood that the control method of the embodiment of the present invention can also be applied to a cloud platform and third-party devices. It should also be noted that the air conditioner control method proposed in the present invention is targeted, that is, the method is also mainly targeted at the heating mode of the heat pump unit.

[0042] Before introducing the defrosting control method of the present invention, the structure of the heat pump unit on which the method is based is briefly described: 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 interconnected by a refrigerant pipeline. The heat pump unit also includes a hot water pipe 6, which is used for water inlet, heating and water outlet, wherein the hot water pipe 6 includes a water inlet pipe, a heating pipe and a water outlet pipe, and the heating pipe is arranged opposite to the indoor heat exchanger 3, and the indoor heat exchanger 3 is used to heat the heating pipe to generate hot water.

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

[0044] Step S1, determining that the heat pump unit is in heating mode, and obtaining the water inlet temperature and water outlet temperature of the hot water pipe 6 of the heat pump unit;

[0045] Step S2, determining that the water inlet temperature and the water outlet temperature meet a first setting condition, and obtaining a change parameter of the working parameter of the heat pump unit within a set time, wherein the first setting condition is that the water inlet temperature and the water outlet temperature meet a first setting condition, and the change parameter of the working parameter of the heat pump unit within a set time;

[0046] Step S3, determining that the variation parameter satisfies a second setting condition, and controlling the heat pump unit to enter a special defrosting mode, wherein the second setting condition is that the variation parameter is within a set variation range.

[0047] According to the defrost control method of the heat pump unit according to the embodiment of the present invention, its specific working process is as follows: the heat pump unit is turned on, when the controller determines that the heat pump unit is in the heating mode, the controller will further obtain the inlet water temperature and the outlet water temperature of the hot water pipe 6 of the heat pump unit, and analyze and judge the inlet water temperature and the outlet water temperature. When it is determined that the inlet water temperature and the outlet water temperature meet the first setting condition, for example, the first setting condition may be that at least one of the inlet water temperature and the outlet water temperature is lower. At this time, due to the low initial water temperature, the normal defrost logic will often cause the outdoor unit condenser to be incompletely defrosted 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 the outlet water temperature meet the first setting condition, the risk of frost on the outdoor heat exchanger 5 is relatively high.

[0048] Therefore, after the judgment condition in step S2 is met, in order to further judge the risk of frost on the outdoor heat exchanger 5, the method will further obtain the change parameters of the working parameters of the heat pump unit within the set time. When the change parameters of the working parameters of the heat pump unit within the set time meet the second set condition, it proves that frosting has occurred on the outdoor heat exchanger 5 or even the frosting is serious. Therefore, the controller will directly control the unit to enter a special defrost mode. In this special defrost mode, the controller enhances the defrost effect by extending the defrost time or increasing the defrost frequency, thereby ensuring that the outdoor heat exchanger 5 is completely defrosted, thereby ensuring the normal heating of the heat pump unit.

[0049] Specifically, the controller can obtain the working parameters of the compressor 1 of the heat pump unit, such as high pressure, low pressure, suction temperature and exhaust temperature, and count the changing states thereof within the set time to generate changing parameters. It can be understood that for the changing parameters of the working parameters of the heat pump unit within the set time, it can reflect the changes in the working state of the heat pump unit, and then indirectly reflect the frosting condition of the outdoor heat exchanger 5, that is, when the change rate of the working parameters of the heat pump unit after the set time is large, it proves that with the continuous progress of heating, the frosting condition of the outdoor heat exchanger 5 becomes more and more serious, thereby causing large fluctuations in the working parameters of the heat pump unit.

[0050] For example, if the rate of change of the high pressure and / or low pressure of the compressor 1 after a set period of time is too large, or if the rate of change of the suction temperature and / or exhaust temperature of the compressor 1 after a set period of time is too large, it proves that the outdoor heat exchanger 5 is severely frosted. At this time, the controller needs to turn on a special defrost mode to perform enhanced defrosting operations on the outdoor heat exchanger 5 to ensure that the outdoor heat exchanger 5 is completely defrosted and the normal heating effect of the heat pump unit is ensured.

[0051] In the related technologies, with the current expansion of the heat pump water heater market and the popularization of products, its heating performance has attracted much attention. When the unit is running for heating at a low outdoor ambient temperature, especially for the first heating, due to the low initial water temperature, the normal defrosting logic often causes the outdoor unit condenser to be defrosted incompletely or even the condenser to continue to freeze, thus affecting the unit's heating operation and user experience.

[0052] In order to solve the technical defects existing in the above-mentioned related technologies, the present invention provides a defrost control method for a heat pump unit. The method detects the parameters of the entire system, intelligently determines the defrost mode from the operating parameters of the unit, and intelligently selects the normal defrost mode or the special defrost mode according to the temperature of the water system, thereby fundamentally solving the defrosting problem under different water temperatures, improving the heating capacity of the unit by improving the defrosting effect of the condenser, and improving the user experience.

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

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

[0055] That is, only when the minimum value of the inlet water temperature and the outlet water temperature is less than the first set temperature, the controller will determine that the outdoor heat exchanger 5 has a greater risk of frost, and then continue to obtain the change parameters of the working parameters of the heat pump unit within the set time to further judge the frost condition of the outdoor heat exchanger 5.

[0056] Further, when the controller determines that the inlet water temperature and the outlet water temperature do not meet the first set condition, that is, 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 defrost mode.

[0057] For example, the first set temperature may be 20°C. At this time, when the minimum value of the inlet water temperature and the outlet water temperature is greater than or equal to 20°C, the unit is in normal defrosting mode. At this time, the heat pump unit determines the condenser frosting condition according to Te=α*Tao+β, where Te is the defrosting temperature of the outdoor heat exchanger 5, Tao is the outdoor ambient temperature, and α and β are constants, usually α=1, β=-10. When the defrosting temperature Te of the outdoor heat exchanger 5 is less than the set value, the heat pump unit defrosts normally.

[0058] When the minimum value of the inlet water temperature and the outlet water temperature is less than 20°C, the degree of frost on the outdoor heat exchanger 5 may be relatively serious. Therefore, in order to accurately judge the current frost condition of the outdoor heat exchanger 5, the controller will further obtain the change parameters of the working parameters of the heat pump unit, and determine the frost condition of the outdoor heat exchanger 5 through the change parameters. When the change 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 defrost mode to perform enhanced defrosting operations on the outdoor heat exchanger 5.

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

[0060] In the step of determining that the change parameter satisfies the second set condition and controlling the heat pump unit to enter a special defrost 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 obtains the pressure change parameter of the compressor 1, that is, obtains the pressure drop rate of the high pressure and / or low pressure of the compressor 1 after a set period of 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 fluctuates greatly, it proves that the outdoor heat exchanger 5 is severely frosted, and at this time the heat pump unit enters a special defrost mode.

[0062] It can be understood that as the heating process of the heat pump unit proceeds, the degree of frost on the outdoor heat exchanger 5 will become more and more serious. At this time, the high-pressure pressure and the low-pressure 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 proves that the degree of frost on the outdoor heat exchanger 5 is relatively light. If the pressure drop rate of the above pressure parameters is too large, it proves that the degree of frost on the outdoor heat exchanger 5 is relatively serious.

[0063] According to some other embodiments of the present invention, the variable parameter includes a temperature drop rate of the exhaust temperature and / or the intake temperature of the compressor 1 after a set period of time.

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

[0065] In this embodiment, the controller obtains the temperature change parameters of the compressor 1, that is, obtains the temperature drop rate of the exhaust temperature and / or the intake temperature of the compressor 1 after a set period of 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 the intake temperature fluctuates greatly, it proves that the outdoor heat exchanger 5 is severely frosted, and the heat pump unit enters a special defrost mode.

[0066] It can be understood that as the heating process of the heat pump unit proceeds, the degree of frost on the outdoor heat exchanger 5 will become more and more serious. At this time, the exhaust temperature and the 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 proves that the degree of frost on the outdoor heat exchanger 5 is relatively light. If the temperature drop rate of the above temperature parameters is too large, it proves that the degree of frost on the outdoor heat exchanger 5 is relatively serious.

[0067] According to still other embodiments of the present invention, the variable parameter includes a defrost temperature of the condenser after a set period of time.

[0068] In the step of determining that the variation parameter satisfies 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 after a set period of time is less than the set defrost temperature.

[0069] The system determines the defrost temperature of the condenser (i.e., the outdoor heat exchanger 5) by Te=α*Tao+β, wherein 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, usually α=1, β=-10.

[0070] It can be understood that the lower the defrost temperature of the condenser, the lower the outdoor heat exchange temperature, and the more serious the frosting of the outdoor heat exchanger 5. Therefore, the heat pump unit enters a special defrost mode and achieves thorough defrosting of the outdoor heat exchanger 5 through enhanced defrosting operations, thereby ensuring the heating effect of the heat pump unit and improving 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 relatively low, it is necessary to strengthen the defrosting mode, that is, to perform special processing by extending the defrosting time, increasing the defrosting frequency, etc.

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

[0073] In the special defrost mode, the defrost time is controlled to be extended to the special defrost time based on the original time.

[0074] In this way, by extending the defrost time, the outdoor heat exchanger 5 with a more serious degree of frosting can be fully defrosted, and a large amount of frost or ice can be completely eliminated during the longer defrost process, avoiding the residual frost or ice on the outdoor heat exchanger 5 and ensuring the heating effect of the heat pump unit.

[0075] Further, in the step of controlling the defrost duration to be extended to a special defrost duration based on the original duration: the special defrost duration is determined according to the changed parameters.

[0076] Specifically, the variable parameters include at least one of the pressure drop rate of the high pressure and / or low pressure of the compressor 1 after a set time, the temperature drop rate of the exhaust temperature and / or suction temperature of the compressor 1 after a set time, and the defrost temperature of the condenser after a set time. The special defrost time is positively correlated with the pressure drop rate and the temperature drop rate, respectively, and the special defrost time is negatively correlated with the defrost temperature.

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

[0078] Among them, the first interval range is larger than the second interval range, the second interval range is larger than the third interval range, then the first defrost time is longer than the second defrost time, and the second defrost time is longer than the third defrost time.

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

[0080] Among them, the first temperature interval is greater than the second temperature interval, and the second temperature interval is greater than the third temperature interval, then the first time length is less than the second time length, and the second time length is less than the third time length.

[0081] In some other embodiments of the present invention, the step of controlling the heat pump unit to enter the special defrost mode specifically includes:

[0082] In the special defrost mode, the defrost frequency of the compressor 1 is controlled to increase to the special defrost frequency based on the original frequency.

[0083] In this way, by increasing the defrosting frequency, the outdoor heat exchanger 5 with a more serious degree of frosting can be fully defrosted, and a large amount of frost or ice can be completely eliminated during the longer defrosting process, thereby avoiding the residual frost or ice on the outdoor heat exchanger 5 and ensuring the heating effect of the heat pump unit.

[0084] Further, in the step of controlling the defrost frequency of the compressor 1 to increase to the special defrost frequency on the basis of the original frequency: the special defrost frequency is determined according to the change parameter.

[0085] Specifically, the changing parameters include at least one of the pressure drop rate of the high pressure and / or low pressure of the compressor 1 after a set period of time, the temperature drop rate of the exhaust temperature and / or intake temperature of the compressor 1 after a set period of time, and the defrost temperature of the condenser after a set period of time. The special defrost frequency is positively correlated with the pressure drop rate and the temperature drop rate, respectively, and the special defrost frequency is negatively correlated with the defrost temperature.

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

[0087] Among them, the first interval range is larger than the second interval range, and the second interval range is larger than the third interval range, then the first defrost frequency is larger than the second defrost frequency, and the second defrost frequency is larger than the third defrost frequency.

[0088] For another 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] The first temperature range is greater than the second temperature range, the second temperature range is greater than the third temperature range, the first frequency is less than the second frequency, and the second frequency is less than the third frequency.

[0090] The defrost control device of the heat pump unit provided by the present invention is described below. The defrost control device of the heat pump unit described below and the defrost control method of the heat pump unit described above can be referred to each other.

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

[0092] The first acquisition module 110 is used to determine whether the heat pump unit is in heating mode and obtain the water inlet temperature and water outlet temperature of the hot water pipe 6 of the heat pump unit;

[0093] The second acquisition module 120 is used to determine whether the inlet water temperature and the outlet water temperature meet a first setting condition, and to obtain a change parameter of the working parameter of the heat pump unit within a set time, wherein the first setting condition is that the temperature is within a set temperature range;

[0094] The control module 130 is used to determine that the change parameter meets the second setting condition and control the heat pump unit to enter a special defrosting mode. The second setting condition is that the change parameter is within a set change range.

[0095] like Figure 3 As shown, the heat pump unit according to the third embodiment of the present invention includes the defrost control device of the heat pump unit according to the second embodiment of the present invention, and also 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 a refrigerant pipeline. The heat pump unit also includes a hot water pipe 6, which is used for water inlet, heating and water outlet, wherein the hot water pipe 6 includes a water inlet pipe, a heating pipe and a water outlet pipe, the heating pipe is arranged 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] The heat pump unit and its defrost control device according to the embodiment of the present invention can intelligently judge the defrost mode from the unit operating parameters through full system parameter detection, and intelligently select the normal defrost mode or the special defrost mode according to the temperature of the water system, thereby fundamentally solving the defrosting problem under different water temperatures, improving the heating capacity of the unit by improving the defrosting effect of the condenser, and improving the user experience.

[0097] like Figure 3As shown, according to some embodiments of the present invention, the suction port of the compressor 1 is provided with a suction temperature sensor 8 and a low pressure sensor 9, and the exhaust port of the compressor 1 is provided 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 of a physical structure diagram of an electronic device is shown in FIG. 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 may call the logic instructions in the memory 830 to execute the defrosting control method of the heat pump unit, including: determining that the heat pump unit is in the heating mode, obtaining the inlet water temperature and the outlet water temperature of the hot water pipe 6 of the heat pump unit; determining that the inlet water temperature and the outlet water temperature meet the first setting condition, obtaining the change parameter of the working parameter of the heat pump unit within the set time, the first setting condition being that it is in the set temperature range; determining that the change parameter meets the second setting condition, controlling the heat pump unit to enter the special defrosting mode, the second setting condition being that it is in the set change range.

[0099] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0100] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program 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 defrost control method for a heat pump unit, including: determining that the heat pump unit is in a heating mode, and obtaining the inlet water temperature and outlet water temperature of a hot water pipe 6 of the heat pump unit; determining that the inlet water temperature and the outlet water temperature meet a first setting condition, and obtaining a change parameter of an operating parameter of the heat pump unit within a set time, wherein the first setting condition is that the operating parameter is within a set temperature range; determining that the change parameter meets a second setting condition, and controlling the heat pump unit to enter a special defrost mode, wherein the second setting condition is that the operating parameter is within a set change range.

[0101] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute a defrost control method for a heat pump unit, including: 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 6 of the heat pump unit; determining that the inlet water temperature and the outlet water temperature satisfy a first setting condition, obtaining a change parameter of an operating parameter of the heat pump unit within a set time, wherein the first setting condition is that the operating parameter is within a set temperature range; determining that the change parameter satisfies a second setting condition, controlling the heat pump unit to enter a special defrost mode, wherein the second setting condition is that the operating parameter is within a set change range.

[0102] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0103] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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 water inlet temperature and water outlet temperature of the hot water pipe of the heat pump unit; Determine that the water inlet temperature and the water outlet temperature meet a first setting condition, and obtain a change parameter of the working parameter of the heat pump unit within a set time, wherein the first setting condition is that the working parameter is within a set temperature range; It is determined that the variation parameter satisfies a second setting condition, and the heat pump unit is controlled to enter a special defrosting mode, wherein the second setting condition is that the variation parameter is within a set variation range.

2. The defrosting control method of a heat pump unit according to claim 1, characterized in that: In the step of determining that the water inlet temperature and the water outlet temperature meet the first set condition and obtaining the change parameters of the working parameters of the heat pump unit within the set time: The first setting condition includes that the minimum value between the inlet water temperature and the outlet water temperature is less than a first setting temperature.

3. The defrosting control method of a heat pump unit according to claim 2, characterized in that: The change parameter includes the pressure drop rate of the high pressure and / or low pressure of the compressor after a set period of time; In the step of determining that the change parameter satisfies the second set condition and controlling the heat pump unit to enter a special defrost mode, the second set condition includes that the pressure drop rate of the high pressure and / or low pressure of the compressor after a set period of time is greater than or equal to the set pressure drop rate.

4. The defrosting control method of a heat pump unit according to claim 2, characterized in that: The change parameter includes the temperature drop rate of the exhaust temperature and / or the suction temperature of the compressor after a set period of time; In the step of determining that the change parameter satisfies the second set condition and controlling the heat pump unit to enter a special defrost mode, the second set condition includes that the temperature drop rate of the exhaust temperature and / or the suction temperature of the compressor after a set period of time is greater than or equal to the set temperature drop rate.

5. The defrosting control method of a heat pump unit according to claim 2, characterized in that: The variable parameters include the defrost temperature of the condenser after a set period of time; In the step of determining that the change parameter satisfies a second set condition and controlling the heat pump unit to enter a special defrost mode, the second set condition includes that the defrost temperature of the condenser after a set period of time is less than a set defrost temperature.

6. The defrost control method for a heat pump unit according to any one of claims 1 to 5, characterized in that: The step of controlling the heat pump unit to enter a special defrost mode specifically includes: In the special defrost mode, the defrost time is controlled to be extended to the special defrost time based on the original time.

7. The defrosting control method of a heat pump unit according to claim 6, characterized in that: In the step of controlling the defrost duration to be extended to a special defrost duration based on the original duration: determining the special defrost duration according to the change parameter; The change parameter includes at least one of a pressure drop rate of the high pressure and / or low pressure of the compressor after a set time, a temperature drop rate of the exhaust temperature and / or suction temperature of the compressor after a set time, and a defrost temperature of the condenser after a set time; The special defrost duration is positively correlated with the pressure drop rate and the temperature drop rate, respectively, and the special defrost duration is negatively correlated with the defrost temperature.

8. The defrost control method for a heat pump unit according to any one of claims 1 to 5, characterized in that: The step of controlling the heat pump unit to enter a special defrost mode specifically includes: In the special defrost mode, the defrost frequency of the compressor is controlled to increase to the special defrost frequency based on the original frequency.

9. The defrosting control method of a heat pump unit according to claim 8, characterized in that: In the step of controlling the defrost frequency of the compressor to increase to a special defrost frequency based on the original frequency: determining the special defrost frequency according to the change parameter; The change parameter includes at least one of a pressure drop rate of the high pressure and / or low pressure of the compressor after a set time, a temperature drop rate of the exhaust temperature and / or suction temperature of the compressor after a set time, and a defrost temperature of the condenser after a set time; The special defrost frequency is positively correlated with the pressure drop rate and the temperature drop rate, respectively, and the special defrost frequency is negatively correlated with the defrost temperature.

10. A defrost control device for a heat pump unit, characterized in that: include: The first acquisition module is used to determine whether the heat pump unit is in heating mode and obtain the water inlet temperature and water outlet temperature of the hot water pipe of the heat pump unit; A second acquisition module is used to determine that the water inlet temperature and the water outlet temperature meet a first setting condition, and to obtain a change parameter of the working parameter of the heat pump unit within a set time, wherein the first setting condition is that the working parameter is within a set temperature range; The control module is used to determine that the change parameter meets a second setting condition and control the heat pump unit to enter a special defrosting mode, wherein the second setting condition is that the change parameter is within a set change range.

11. 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, the defrost control method for the heat pump unit according to any one of claims 1 to 9 is implemented.

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