Control method and device of heat pump unit, heat pump unit and computer storage medium

Abstract

The invention provides a control method and device for a heat pump unit, the heat pump unit and a computer storage medium, and the method comprises the steps that when it is detected that the internal water temperature of an anti-freezing valve is lower than a preset freezing water temperature threshold value, the heat pump unit enters an anti-freezing mode from a standby mode, and a water pump starts to operate; the first water inlet temperature and the first water outlet temperature of the water side heat exchanger are obtained; after the water pump operates for a first preset duration, if the current second water inlet temperature and the current second water outlet temperature of the water side heat exchanger meet the preset temperature rising condition, the water pump is controlled to operate for a second preset duration and then is closed, and the heat pump unit is switched into the standby mode; and whether the lowest temperature of the current third water inlet temperature and the current third water outlet temperature of the water side heat exchanger is smaller than the target initial temperature or not is judged, if yes, the heat pump unit is switched into the anti-freezing mode, and the target initial temperature is the highest temperature of the first water inlet temperature and the first water outlet temperature. According to the embodiment provided by the scheme, the operation stability and reliability of the heat pump unit can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump units, and in particular to a control method and device for a heat pump unit, a heat pump unit and a computer storage medium. Background Art

[0002] At present, the water-side heat exchanger in the air source heat pump unit usually uses water as the heat transfer medium for heat exchange with the refrigerant. However, water is very easy to condense into ice at low temperatures, so this type of heat pump unit has the problem of antifreeze of the water-side heat exchanger in cold weather.

[0003] In the related art, the heat pump unit is usually controlled to enter the anti-freeze mode by comparing the inlet and outlet water temperatures of the water-side heat exchanger with the temperature threshold. However, unreasonable setting of the temperature threshold may cause the heat pump unit to frequently enter the anti-freeze mode, or cause the water-side heat exchanger and water circuit to have the risk of freezing and cracking, thereby resulting in low operating stability of the heat pump unit. Summary of the invention

[0004] The embodiments of the present application provide a control method and device for a heat pump unit, a heat pump unit and a computer storage medium, which can improve the stability and reliability of the operation of the heat pump unit. The above technical solution is as follows:

[0005] In a first aspect, an embodiment of the present application provides a control method for a heat pump unit, wherein the heat pump unit includes a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop includes a water-side heat exchanger, the water circulation loop includes the water-side heat exchanger, an antifreeze valve and a water pump, the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger, and the method includes:

[0006] When the heat pump unit is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that the internal water temperature of the antifreeze valve is lower than a preset freezing water temperature threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger are obtained;

[0007] After the water pump runs for a first preset time, obtaining the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger;

[0008] Determine whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition, and if so, control the water pump to run for a second preset time and then turn off the water pump, and control the heat pump unit to switch from the anti-freeze mode to the standby mode;

[0009] After the heat pump unit is switched from the anti-freeze mode to the standby mode, determine whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature; if so, control the heat pump unit to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

[0010] In a possible implementation, the method further includes:

[0011] After the heat pump unit switches from the anti-freeze mode to the standby mode, if the third water inlet temperature and / or the third water outlet temperature is not less than the target initial temperature, the water pump is controlled to run for the first period of time, and then returns to execute the step of determining whether the lowest temperature of the third water inlet temperature and the third water outlet temperature of the water side heat exchanger in the current standby mode is less than the target initial temperature.

[0012] In a possible implementation, the method further includes:

[0013] When the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, the water flow rate of the antifreeze valve is obtained based on a preset detection cycle, and a water flow rate increase value of the obtained current water flow rate relative to the historical water flow rate obtained in the previous detection cycle is determined;

[0014] It is determined whether the water flow increase value is greater than or equal to a preset threshold value. If so, it is determined that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value.

[0015] In a possible implementation, the method further includes:

[0016] When the second water inlet temperature and the second water outlet temperature do not satisfy the preset temperature increase condition, obtaining the continuous operation time of the water pump;

[0017] Determine whether the above continuous operation time reaches a preset time threshold;

[0018] When the continuous operation time does not reach the preset time threshold, the water pump is controlled to continue to run for the first preset time, and then returns to execute the step of determining whether the second water inlet temperature and the second water outlet temperature meet the preset heating conditions.

[0019] In a possible implementation, the method further includes:

[0020] When the continuous operation time reaches the preset time threshold, the heat pump unit is controlled to start heating operation.

[0021] In a possible implementation, the method further includes:

[0022] When the heat pump unit is in heating operation, obtaining a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger;

[0023] When it is detected that both the fourth water inlet temperature and the fourth water outlet temperature are not less than the preset shutdown temperature threshold, the heat pump unit is controlled to stop running.

[0024] In a possible implementation, the method further includes:

[0025] After the heat pump unit stops running, if it is detected that the water pump operation time reaches a third preset time, the water pump is controlled to stop running, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode.

[0026] In a possible implementation, the antifreeze valve is used to detect the internal water temperature of the antifreeze valve, and control the antifreeze valve to open when the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold to drain water.

[0027] In a possible implementation, the water outlet of the water side heat exchanger is provided with an outlet water temperature sensing bag, and the water inlet of the water side heat exchanger is provided with an inlet water temperature sensing bag. The outlet water temperature sensing bag is used to collect the outlet water temperature of the water side heat exchanger, and the inlet water temperature sensing bag is used to collect the inlet water temperature of the water side heat exchanger.

[0028] In a possible implementation, the heat pump unit further includes a water flow sensor, which is connected to the antifreeze valve and is used to collect the water flow of the antifreeze valve.

[0029] In a possible implementation, the heat pump unit further includes a user-side terminal, and the user-side terminal includes a display;

[0030] The user-side terminal is used to obtain the operating parameters of the heat pump unit and display the operating parameters through the display.

[0031] In a second aspect, an embodiment of the present application provides a control method for a heat pump unit, wherein the heat pump unit includes a refrigerant circulation loop and a water circulation loop, wherein the refrigerant circulation loop includes a water-side heat exchanger, and the water circulation loop includes the water-side heat exchanger, an antifreeze valve, a water flow sensor, and a water pump, wherein the water flow sensor is used to collect the water flow of the antifreeze valve, and the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger; the control method includes:

[0032] When the heat pump unit is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that the water flow increase value of the current water flow of the antifreeze valve relative to the historical water flow of the previous detection cycle is greater than or equal to the preset threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger are obtained;

[0033] After the water pump runs for a first preset time, obtaining the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger;

[0034] Determine whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition, and if so, control the water pump to run for a second preset time and then turn off the water pump, and control the heat pump unit to switch from the anti-freeze mode to the standby mode;

[0035] After the heat pump unit is switched from the anti-freeze mode to the standby mode, determine whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature; if so, control the heat pump unit to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

[0036] In a possible implementation, the method further includes:

[0037] After the heat pump unit switches from the anti-freeze mode to the standby mode, if the lowest temperature between the third water inlet temperature and the third water outlet temperature is not less than the target initial temperature, the water pump is controlled to run for a first period of time, and then returns to execute the step of determining whether the lowest temperature between the third water inlet temperature and the third water outlet temperature of the water side heat exchanger in the current standby mode is less than the target initial temperature.

[0038] In a possible implementation, the method further includes:

[0039] When the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, the water flow rate of the antifreeze valve is obtained based on a preset detection cycle, and a water flow rate increase value of the current water flow rate of the antifreeze valve relative to the historical water flow rate of the previous detection cycle is determined;

[0040] Determine whether the water flow increase value is greater than or equal to the preset threshold.

[0041] In a possible implementation, the method further includes:

[0042] When the second water inlet temperature and the second water outlet temperature do not satisfy the preset temperature increase condition, obtaining the continuous operation time of the water pump;

[0043] Determine whether the above continuous operation time reaches a preset time threshold;

[0044] When the continuous operation time does not reach the preset time threshold, the water pump is controlled to continue to run for the first preset time, and then returns to execute the step of determining whether the second water inlet temperature and the second water outlet temperature meet the preset heating conditions.

[0045] In a possible implementation, the method further includes:

[0046] When the continuous operation time reaches the preset time threshold, the heat pump unit is controlled to start heating operation.

[0047] In a possible implementation, the method further includes:

[0048] When the heat pump unit is in heating operation, obtaining a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger;

[0049] When it is detected that both the fourth water inlet temperature and the fourth water outlet temperature are not less than the preset shutdown temperature threshold, the heat pump unit is controlled to stop running.

[0050] In a possible implementation, the method further includes:

[0051] After the heat pump unit stops running, if it is detected that the water pump operation time reaches a third preset time, the water pump is controlled to stop running, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode.

[0052] In a third aspect, an embodiment of the present application provides a control device for a heat pump unit, wherein the heat pump unit includes a refrigerant circulation loop and a water circulation loop, wherein the refrigerant circulation loop includes a water-side heat exchanger, wherein the water circulation loop includes the water-side heat exchanger, an antifreeze valve and a water pump, and wherein the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger; the device includes:

[0053] A first control module is used for controlling the heat pump unit to enter the antifreeze mode from the standby mode, and controlling the water pump to start running, and obtaining the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger when it is detected that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value when the heat pump unit is in the standby mode and the current ambient temperature is lower than the preset ambient temperature threshold value;

[0054] A first acquisition module, used for acquiring the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger after the water pump runs for a first preset time;

[0055] A first judgment module is used to judge whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition, and if so, control the water pump to run for a second preset time and then shut down the water pump, and control the heat pump unit to switch from the anti-freezing mode to the standby mode;

[0056] The second judgment module is used to judge whether the lowest temperature of the third water inlet temperature and the third water outlet temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature after the heat pump unit is switched from the anti-freeze mode to the standby mode. If so, the heat pump unit is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first water inlet temperature and the first water outlet temperature.

[0057] In a possible implementation, the above device further includes:

[0058] The third control module is used for controlling the water pump to run for a first period of time after the heat pump unit switches from the anti-freeze mode to the standby mode, and then returns to execute the step of determining whether the lowest temperature between the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature if the lowest temperature between the third inlet water temperature and the third outlet water temperature is not lower than the target initial temperature.

[0059] In a possible implementation, the above device further includes:

[0060] A first determination module is used for, when the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, obtaining the water flow of the antifreeze valve based on a preset detection cycle, and determining a water flow increase value of the obtained current water flow relative to a historical water flow obtained in a previous detection cycle;

[0061] The fifth judgment module is used to judge whether the water flow increase value is greater than or equal to a preset threshold value. If so, it is determined that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value.

[0062] In a possible implementation, the above device further includes:

[0063] A third acquisition module is used to acquire the continuous operation time of the water pump when the second water inlet temperature and the second water outlet temperature do not meet the preset temperature increase condition;

[0064] A sixth judgment module is used to judge whether the above-mentioned continuous operation time reaches a preset time threshold;

[0065] The fourth control module is used to control the water pump to continue running for the first preset time period when the above-mentioned continuous operation time period does not reach the above-mentioned preset time period threshold, and then return to execute the above-mentioned step of determining whether the above-mentioned second water inlet temperature and the above-mentioned second water outlet temperature meet the preset heating conditions.

[0066] In a possible implementation, the above device further includes:

[0067] The fifth control module is used to control the heat pump unit to start heating operation when the continuous operation time reaches the preset time threshold.

[0068] In a possible implementation, the above device further includes:

[0069] A fourth acquisition module, used for acquiring a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger when the heat pump unit is in heating operation;

[0070] The sixth control module is used to control the heat pump unit to stop running when it is detected that the fourth water inlet temperature and the fourth water outlet temperature are not less than a preset shutdown temperature threshold.

[0071] In a possible implementation, the above device further includes:

[0072] The seventh control module is used to control the water pump to stop running and control the heat pump unit to switch from the anti-freeze mode to the standby mode after the heat pump unit stops running if it is detected that the running time of the water pump reaches a third preset time.

[0073] In a possible implementation, the antifreeze valve is used to detect the internal water temperature of the antifreeze valve, and control the antifreeze valve to open when the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold to drain water.

[0074] In a possible implementation, the water outlet of the water side heat exchanger is provided with an outlet water temperature sensing bag, and the water inlet of the water side heat exchanger is provided with an inlet water temperature sensing bag. The outlet water temperature sensing bag is used to collect the outlet water temperature of the water side heat exchanger, and the inlet water temperature sensing bag is used to collect the inlet water temperature of the water side heat exchanger.

[0075] In a possible implementation, the heat pump unit further includes a water flow sensor, which is connected to the antifreeze valve and is used to collect the water flow of the antifreeze valve.

[0076] In a possible implementation, the heat pump unit further includes a user-side terminal, and the user-side terminal includes a display;

[0077] The user-side terminal is used to obtain the operating parameters of the heat pump unit and display the operating parameters through the display.

[0078] In a fourth aspect, an embodiment of the present application provides a control device for a heat pump unit, wherein the heat pump unit includes a refrigerant circulation loop and a water circulation loop, wherein the refrigerant circulation loop includes a water-side heat exchanger, wherein the water circulation loop includes the water-side heat exchanger, an antifreeze valve, and a water pump, wherein the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger; the control device includes:

[0079] A second control module is used for controlling the heat pump unit to enter the anti-freeze mode from the standby mode, and controlling the water pump to start running, and obtaining the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger when it is detected that the water flow increase value of the current water flow of the anti-freeze valve relative to the historical water flow of the previous detection cycle is greater than or equal to the preset threshold value when the heat pump unit is in the standby mode and the current ambient temperature is lower than the preset ambient temperature threshold;

[0080] A second acquisition module is used to acquire the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger after the water pump runs for a first preset time;

[0081] A third judgment module is used to judge whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition, and if so, control the water pump to run for a second preset time and then turn off the water pump, and control the heat pump unit to switch from the anti-freezing mode to the standby mode;

[0082] The fourth judgment module is used to judge whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature after the heat pump unit is switched from the anti-freeze mode to the standby mode. If so, the heat pump unit is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

[0083] In a possible implementation, the above device further includes:

[0084] The eighth control module is used for controlling the water pump to run for a first period of time after the heat pump unit is switched from the anti-freeze mode to the standby mode, and then returning to execute the step of determining whether the lowest temperature between the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature if the lowest temperature between the third inlet water temperature and the third outlet water temperature is not lower than the target initial temperature.

[0085] In a possible implementation, the above device further includes:

[0086] A third determination module is used for, when the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, obtaining the water flow of the antifreeze valve based on a preset detection cycle, and determining a water flow increase value of the obtained current water flow relative to a historical water flow obtained in a previous detection cycle;

[0087] The seventh judgment module is used to judge whether the water flow increase value is greater than or equal to a preset threshold value. If so, it is determined that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value.

[0088] In a possible implementation, the above device further includes:

[0089] A fifth acquisition module, configured to acquire the continuous operation time of the water pump when the second water inlet temperature and the second water outlet temperature do not satisfy the preset temperature increase condition;

[0090] An eighth judgment module is used to judge whether the above-mentioned continuous operation time reaches a preset time threshold;

[0091] The fourth control module is used to control the water pump to continue running for the first preset time period when the above-mentioned continuous operation time period does not reach the above-mentioned preset time period threshold, and then return to execute the above-mentioned step of determining whether the above-mentioned second water inlet temperature and the above-mentioned second water outlet temperature meet the preset heating conditions.

[0092] In a possible implementation, the above device further includes:

[0093] The ninth control module is used to control the heat pump unit to start heating operation when the continuous operation time reaches the preset time threshold.

[0094] In a possible implementation, the above device further includes:

[0095] a sixth acquisition module, configured to acquire a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger when the heat pump unit is in heating operation;

[0096] The tenth control module is used to control the heat pump unit to stop running when it is detected that the fourth water inlet temperature and the fourth water outlet temperature are not less than a preset shutdown temperature threshold.

[0097] In a possible implementation, the above device further includes:

[0098] The eleventh control module is used for controlling the water pump to stop running and controlling the heat pump unit to switch from the anti-freeze mode to the standby mode after the heat pump unit stops running if it is detected that the running time of the water pump reaches a third preset time.

[0099] In a fifth aspect, an embodiment of the present application provides a heat pump unit, comprising: a refrigerant circulation loop and a water circulation loop, wherein the refrigerant circulation loop comprises a water-side heat exchanger, and the water circulation loop comprises the water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger;

[0100] The above-mentioned heat pump unit is used to operate according to the control method of the heat pump unit provided according to the first aspect of the embodiment of the present application or any possible implementation of the first aspect, or is used to operate according to the control method of the heat pump unit provided according to the second aspect of the embodiment of the present application or any possible implementation of the second aspect.

[0101] In a sixth aspect, an embodiment of the present application provides a computer storage medium, wherein the computer storage medium stores a plurality of instructions, wherein the instructions are suitable for being loaded by a processor and executing the steps of the method provided by the first aspect of the embodiment of the present application or any possible implementation of the first aspect, or are suitable for being loaded by a processor and executing the steps of the method provided by the second aspect of the embodiment of the present application or any possible implementation of the second aspect.

[0102] In the embodiment of the present application, the heat pump unit includes a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop includes a water-side heat exchanger, the water circulation loop includes a water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger; when the heat pump unit is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that the internal water temperature of the antifreeze valve is lower than a preset freezing water temperature threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, and the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger are obtained; when the water pump runs at the first preset After the temperature reaches the preset temperature, the second water inlet temperature and the second water outlet temperature of the water side heat exchanger are obtained; it is determined whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising conditions. If so, the water pump is controlled to run for the second preset time and then shut down, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode; after the heat pump unit is switched from the anti-freezing mode to the standby mode, it is determined whether the lowest temperature of the third water inlet temperature and the third water outlet temperature of the water side heat exchanger in the current standby mode is less than the target initial temperature. If so, the heat pump unit is controlled to switch from the standby mode to the anti-freezing mode, wherein the target initial temperature is the highest temperature of the first water inlet temperature and the first water outlet temperature. Therefore, by detecting the internal water temperature of the antifreeze valve and the water inlet and outlet temperatures of the water side heat exchanger, it is possible to quickly determine whether the system is facing the risk of freezing, thereby entering the anti-freezing mode in time to protect the water side heat exchanger and the water circulation pipeline from freezing damage. Moreover, after entering the anti-freeze mode for the first time, the subsequent anti-freeze mode switching can directly enter the anti-freeze mode according to the water temperature that first triggered the anti-freeze mode, avoiding the situation where the anti-freeze valve drains water multiple times and frequently enters the anti-freeze mode, effectively saving water resources, reducing the wear of the anti-freeze valve, and extending its service life. In addition, directly entering the anti-freeze mode can respond to low temperature environments more quickly, prevent equipment from freezing and damage, and improve the stability and reliability of the operation of the heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0103] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0104] Figure 1 A schematic structural diagram of a heat pump unit provided for an exemplary embodiment of the present application;

[0105] Figure 2 A flow chart of a control method for a heat pump unit provided by an exemplary embodiment of the present application;

[0106] Figure 3A schematic diagram of a control method for a heat pump unit to enter an anti-freeze mode provided by an exemplary embodiment of the present application;

[0107] Figure 4 A specific flow chart of a control method for a heat pump unit provided by an exemplary embodiment of the present application;

[0108] Figure 5 A flow chart of another control method of a heat pump unit provided as an exemplary embodiment of the present application;

[0109] Figure 6 A schematic structural diagram of a control device for a heat pump unit provided by an exemplary embodiment of the present application;

[0110] Figure 7 A schematic structural diagram of another control device for a heat pump unit provided by an exemplary embodiment of the present application;

[0111] Figure 8 A schematic structural diagram of a heat pump unit provided as an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0112] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0113] The terms "first", "second", "third", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0114] Please refer to the following Figure 1 , which exemplarily shows a structural schematic diagram of a heat pump unit 100 provided in an embodiment of the present application. Figure 1 As shown, the heat pump unit 100 includes a refrigerant circulation loop 110, a water circulation loop 120 and a processor (not shown in the figure). The refrigerant circulation loop 110 mainly realizes energy absorption and release through the phase change and flow of the refrigerant; the water circulation loop 120 is mainly used to transport heat to the user side terminal or absorb heat from the user side terminal.

[0115] In some embodiments, the refrigerant circulation loop 110 includes a compressor 111, a four-way valve 112, a fin heat exchanger 113, an electronic expansion valve 114 and a water-side heat exchanger 115 connected in sequence through pipelines. The water-side heat exchanger 115 may be a plate-type water-side heat exchanger; the refrigerant circulation loop may also include a fan 116 installed on the outside of the fin heat exchanger 113. The compressor 111 compresses the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure gas, so that the refrigerant has the ability to release heat, and then discharges the refrigerant into the four-way valve 112; the four-way valve 112 is used to switch the flow direction of the refrigerant, thereby realizing the conversion of the cooling and heating modes. In cooling mode, high-temperature and high-pressure gas dissipates heat through the fin heat exchanger 113, which acts as a condenser to cool the high-temperature and high-pressure refrigerant into a high-pressure liquid; the electronic expansion valve 114 reduces the refrigerant pressure by adjusting the opening, causing it to enter a low-temperature and low-pressure state, and the low-temperature and low-pressure refrigerant absorbs heat from the water circulation loop 120 in the water-side heat exchanger 115 and evaporates into a gaseous state. In heating mode, high-temperature and high-pressure gas directly enters the water-side heat exchanger 115 to release heat to the water circulation loop 120.

[0116] In some embodiments, the water circulation loop 120 includes a user-side terminal 121, a water flow sensor 122, an antifreeze valve 123, an inlet water temperature sensing package 124, a water-side heat exchanger 115, an outlet water temperature sensing package 125, and a water pump 126, which are sequentially connected through pipelines. In the water circulation loop 120, the return water enters the water-side heat exchanger 115 from the user-side terminal 121 through the water flow sensor 122, the antifreeze valve 123, and the inlet water temperature sensing package 124. The water-side heat exchanger 115 exchanges heat between water and refrigerant to increase or decrease the water temperature; and then the outlet water after heat exchange returns to the user-side terminal 121 through the outlet water temperature sensing package 125 to transfer the cold and heat to the target environment.

[0117] The user-side terminal 121 realizes cooling or heating of the room by circulating water. The water flow sensor 122 is used to detect the water flow to ensure normal water circulation. The antifreeze valve 123 prevents water from freezing in the pipeline in a low temperature environment to protect the safety of the system. The water inlet temperature sensor 124 is used to detect the water temperature entering the water-side heat exchanger 115, and is used to adjust the operation of the heat pump unit 100 to ensure that the water temperature is within a reasonable range. The water-side heat exchanger 115 realizes heat exchange between the refrigerant and water, transfers the heat in the refrigerant to the water, or absorbs the heat in the water into the refrigerant. The water outlet temperature sensor 125 is used to detect the outlet water temperature of the water-side heat exchanger 115, which is used for feedback control to further optimize the operation process of the heat pump unit 100. The water pump 126 is used to provide circulation power to push water into the entire water circulation loop 120.

[0118] In some embodiments, the processor is used to perform the following steps: when the heat pump unit 100 is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that the internal water temperature of the antifreeze valve 123 is lower than a preset freezing water temperature threshold, the heat pump unit 100 is controlled to enter the antifreeze mode from the standby mode, and the water pump 126 is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water side heat exchanger 115 are obtained; after the water pump 126 runs for a first preset time, the current second water inlet temperature and the second water outlet temperature of the water side heat exchanger 115 are obtained; and the second water inlet temperature and the second water outlet temperature are determined. Whether the water temperature meets the preset heating condition, if so, the water pump 126 is controlled to run for the second preset time and then shut down the water pump 126, and the heat pump unit 100 is controlled to switch from the anti-freeze mode to the standby mode; after the heat pump unit 100 is switched from the anti-freeze mode to the standby mode, it is determined whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water side heat exchanger 115 in the current standby mode is lower than the target initial temperature, if so, the heat pump unit 100 is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

[0119] An exemplary embodiment of the present application provides a control method for a heat pump unit. The control method for a heat pump unit can be applied to the above processor. For details, please refer to Figure 2 , which exemplarily shows a flow chart of a control method for a heat pump unit provided in an embodiment of the present application. Figure 2 As shown, the control method of the heat pump unit includes the following S201-S204:

[0120] S201. When the heat pump unit is in standby mode and the current ambient temperature is lower than the preset ambient temperature threshold, when it is detected that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water side heat exchanger are obtained.

[0121] In some embodiments, the standby mode indicates that the heat pump unit is in a non-antifreeze state, but the antifreeze operation can be started at any time; the antifreeze mode is an operation mode adopted to prevent the water body from freezing.

[0122] In some embodiments, the ambient temperature may be the real-time temperature around the heat pump unit, which may be acquired by an ambient temperature sensor.

[0123] In some embodiments, the antifreeze valve is used to detect the internal water temperature of the antifreeze valve, and control the antifreeze valve to open when the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold to drain water. Specifically, when the internal water temperature of the antifreeze valve is lower than the start temperature T k When the water temperature inside the antifreeze valve drops to the preset freezing water temperature threshold T k-n (where n>0 and is an integer), the valve itself will be fully opened, and this process does not require any external force; when the water temperature inside the antifreeze valve is higher than the shutdown temperature T i The valve will automatically close.

[0124] That is to say, when it is detected that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold, it means that the antifreeze valve itself has been fully opened, and the heat pump unit can be controlled to enter the antifreeze mode from the standby mode. When the temperature of the entire heat pump unit is lower than the preset freezing water temperature threshold, the water in the water circulation loop can be quickly drained, and the antifreeze valve automatically controls its own opening or closing according to the water temperature, so that the heat pump unit can still prevent the water inside the plate water side heat exchanger from freezing when the power is off, effectively improving the stability and reliability of the operation of the heat pump unit.

[0125] In some embodiments, the water outlet of the water side heat exchanger is provided with a water outlet temperature sensing bag, and the water inlet of the water side heat exchanger is provided with a water inlet temperature sensing bag. The water outlet temperature sensing bag is used to collect the water outlet temperature of the water side heat exchanger, and the water inlet temperature sensing bag is used to collect the water inlet temperature of the water side heat exchanger. After the heat pump unit enters the anti-freeze mode, the water pump is immediately turned on to control the water pump to start running. At the same time, the first water inlet temperature of the water side heat exchanger is collected through the water inlet temperature sensing bag, and the first water outlet temperature of the water side heat exchanger is collected through the water outlet temperature sensing bag.

[0126] The temperature data is collected by the inlet and outlet temperature sensors to detect the temperature changes of the water flow in the water-side heat exchanger in real time. When the heat pump unit enters the anti-freeze mode, by analyzing the difference in the inlet and outlet water temperatures, it can detect whether the water temperature has dropped to the critical value that may cause freezing, thereby protecting and reducing the probability of damage to the heat pump unit.

[0127] S202: After the water pump runs for a first preset time, obtain the current second water inlet temperature and second water outlet temperature of the water-side heat exchanger.

[0128] After the heat pump unit enters the anti-freeze mode, if it is detected that the water pump has been running for the first preset time, the current second inlet water temperature of the water side heat exchanger is collected through the inlet water temperature sensing package, and the current second outlet water temperature of the water side heat exchanger is collected through the outlet water temperature sensing package.

[0129] S203, determining whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising conditions, and if so, controlling the water pump to run for a second preset time and then shutting down the water pump, and controlling the heat pump unit to switch from the anti-freeze mode to the standby mode.

[0130] In some embodiments, the preset temperature increase condition is a preset temperature increase standard for determining whether a safe temperature is reached. Specifically, the preset temperature increase condition may be: the difference between the second water inlet temperature and the first water inlet temperature is greater than a preset temperature difference threshold, and the difference between the second water outlet temperature and the first water outlet temperature is greater than a preset temperature difference threshold.

[0131] That is to say, after the second water inlet temperature and the above-mentioned second water outlet temperature meet the heating conditions, the water pump needs to continue to run for the second preset time, and then shut down the water pump, thereby adjusting the operating state of the heat pump unit from the anti-freeze mode back to the standby mode.

[0132] S204. After the heat pump unit is switched from the anti-freeze mode to the standby mode, determine whether the lowest temperature between the third water inlet temperature and the third water outlet temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature; if so, control the heat pump unit to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature between the first water inlet temperature and the first water outlet temperature.

[0133] In some embodiments, the target initial temperature is a reference temperature for determining whether it is necessary to re-enter the anti-freeze mode, and may be the highest water inlet temperature or water outlet temperature detected when the anti-freeze mode is initially entered.

[0134] It is understandable that when the heat pump unit switches from the anti-freeze mode back to the standby mode, the heat pump unit needs to ensure that the water temperature is maintained within a safe range. If the lowest temperature of the third inlet water temperature and the third outlet water temperature is lower than the target initial temperature, it means that the water temperature has dropped to the highest inlet water temperature or outlet water temperature detected when the anti-freeze mode was initially entered, and there may be a risk of freezing, so the heat pump unit is controlled to enter the anti-freeze mode again.

[0135] Among them, the highest temperature between the first water inlet temperature and the above-mentioned first water outlet temperature is used as the reference temperature for judging whether it is necessary to re-enter the anti-freeze mode. The probability of the anti-freeze valve draining due to the water temperature being too low before entering the anti-freeze mode for the second time can be reduced, so that after the anti-freeze mode is triggered for the first time, the subsequent anti-freeze mode can be directly entered according to the water temperature at which the anti-freeze mode is triggered for the first time, thereby reducing the probability of the anti-freeze valve draining multiple times and frequently entering the anti-freeze mode, effectively saving water resources, reducing the wear of the anti-freeze valve, and extending its service life.

[0136] In the embodiment of the present application, the heat pump unit includes a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop includes a water-side heat exchanger, the water circulation loop includes a water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger; when the heat pump unit is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that the internal water temperature of the antifreeze valve is lower than a preset freezing water temperature threshold, it is determined that the heat pump unit enters the antifreeze mode from the standby mode, and the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger are obtained; when the water pump runs at the first preset After the temperature reaches the preset temperature, the second water inlet temperature and the second water outlet temperature of the water side heat exchanger are obtained; it is determined whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising conditions. If so, the water pump is controlled to run for the second preset time and then shut down, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode; after the heat pump unit is switched from the anti-freezing mode to the standby mode, it is determined whether the lowest temperature of the third water inlet temperature and the third water outlet temperature of the water side heat exchanger in the current standby mode is less than the target initial temperature. If so, the heat pump unit is controlled to switch from the standby mode to the anti-freezing mode, wherein the target initial temperature is the highest temperature of the first water inlet temperature and the first water outlet temperature. Therefore, by detecting the internal water temperature of the antifreeze valve and the water inlet and outlet temperatures of the water side heat exchanger, it is possible to quickly determine whether the system is facing the risk of freezing, thereby entering the anti-freezing mode in time to protect the water side heat exchanger and the water circulation pipeline from freezing damage. Moreover, after entering the anti-freeze mode for the first time, the subsequent anti-freeze mode switching can directly enter the anti-freeze mode according to the water temperature that first triggered the anti-freeze mode, avoiding the situation where the anti-freeze valve drains water multiple times and frequently enters the anti-freeze mode, effectively saving water resources, reducing the wear of the anti-freeze valve, and extending its service life. In addition, directly entering the anti-freeze mode can respond to low temperature environments more quickly, prevent equipment from freezing and damage, and improve the stability and reliability of the operation of the heat pump unit.

[0137] In some embodiments, the above method further comprises:

[0138] After the heat pump unit switches from the anti-freeze mode to the standby mode, if the lowest temperature between the third water inlet temperature and the third water outlet temperature is not less than the target initial temperature, the water pump is controlled to run for a first period of time, and then returns to execute the step of determining whether the lowest temperature between the third water inlet temperature and the third water outlet temperature of the water side heat exchanger in the current standby mode is less than the target initial temperature.

[0139] In some embodiments, if the lowest temperature among the third water inlet temperature and the third water outlet temperature is not less than the target initial temperature, it means that the water temperature is still high and there is no risk of freezing for the time being. The water pump can be controlled to continue running for the second preset time before making a judgment.

[0140] The embodiments of the present application can save energy while improving the safety of the heat pump unit operating in a low-temperature environment, reduce the probability of equipment damage or performance degradation due to water freezing, and effectively improve the stability and reliability of the heat pump unit operation.

[0141] In some embodiments, the above method further includes S211-S214:

[0142] S211. When the second water inlet temperature and the second water outlet temperature do not satisfy the preset temperature increase condition, obtain the continuous operation time of the water pump.

[0143] The second water inlet temperature and the second water outlet temperature do not meet the preset temperature increase condition, that is, after the water pump has been running for a period of time (the first preset time), the water temperature does not reach the preset temperature increase standard. At this time, the continuous operation time of the water pump can be obtained to determine whether further measures need to be taken later.

[0144] S212: Determine whether the above-mentioned continuous operation time reaches a preset time threshold.

[0145] The preset time threshold may be a preset maximum continuous operation time of the water pump. If the temperature rise condition is not met after this time, other measures may be taken.

[0146] In some embodiments, the preset duration threshold may be greater than the first preset duration. For example, the continuous operation duration may be twice the first preset duration.

[0147] S213. When the continuous operation time does not reach the preset time threshold, control the water pump to continue to operate for the first preset time, and then return to the step of determining whether the second water inlet temperature and the second water outlet temperature meet the preset heating conditions.

[0148] That is to say, when the continuous operation time of the water pump has not reached the upper limit (preset duration threshold), the water pump is controlled to run for a period of time, and a new second water inlet temperature and second water outlet temperature are collected to perform the next round of judgment until it is determined that the continuous operation time reaches the preset duration threshold, and then S214 is executed.

[0149] S214: When the continuous operation time reaches the preset time threshold, control the heat pump unit to start heating operation.

[0150] Among them, controlling the above-mentioned heat pump unit to start heating operation means starting the heating function of the heat pump to actively increase the water temperature. When the continuous operation time of the water pump has reached the upper limit, but the water temperature has not reached the safe range, it can be considered that water circulation alone cannot prevent freezing. At this time, the heating function of the heat pump unit is started to actively heat the water temperature to improve the safety of the heat pump unit.

[0151] In the embodiment of the present application, by detecting the water temperature and the continuous running time of the water pump, phased anti-freezing measures are implemented. First, a low-energy consumption method (only running the water pump) is tried to prevent freezing; if the expected effect is not achieved, the heating measure is started to prevent freezing, and then it is possible to intelligently switch between circulating water and active heating to achieve a better anti-freezing effect, increase energy utilization efficiency, prevent the water pump from running continuously for a long time, avoid excessive wear of the equipment, and extend the life of the equipment.

[0152] In some embodiments, the above method further includes S215-S4216:

[0153] S215. When the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, the water flow of the antifreeze valve is obtained based on a preset detection cycle, and the water flow increase value of the obtained current water flow relative to the historical water flow obtained in the previous detection cycle is determined.

[0154] In some embodiments, the water flow rate of the antifreeze valve can be collected by a water flow sensor. The water flow sensor is connected to the antifreeze valve, and the water flow sensor is used to collect the water flow rate of the antifreeze valve.

[0155] The water flow sensor can detect the water flow through the antifreeze valve in real time. The real-time collected water flow data can accurately reflect the working status of the antifreeze valve, effectively improving the reliability of the heat pump unit operation.

[0156] S215, determining whether the water flow increase value is greater than or equal to a preset threshold value, and if so, determining that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value.

[0157] Specifically, when it is detected that the current ambient temperature is lower than the preset ambient temperature, the initial water flow Q1 of the antifreeze valve is collected, and then after the current water flow Q2 is collected in the next detection cycle, the difference between the current water flow Q2 and the initial water flow (i.e., historical water flow) Q1 collected in the previous detection cycle is calculated as the water flow increase value △Q=Q2-Q1 of the current water flow relative to the historical water flow obtained in the previous detection cycle. Then, it is determined whether the water flow increase value △Q is greater than or equal to a preset threshold value, wherein the preset threshold value can be the water flow value flowing in a unit cycle when the freezing valve is fully opened.

[0158] If the water flow increase value △Q is greater than or equal to the preset threshold, it means that the antifreeze valve has been fully opened, that is, the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold. If the water flow increase value △Q is less than the preset threshold, it means that the antifreeze valve is not fully opened, and then the next detection cycle can be entered, and the water flow Q3 of the next detection cycle can be continuously collected, and the current water flow Q2 collected in the current detection cycle is used as the new historical water flow, and so on.

[0159] Figure 3 A flow chart of a control method for a heat pump unit to enter an anti-freeze mode is provided as a flowchart of an exemplary embodiment of the present application. Figure 3 The control method for the heat pump unit to enter the anti-freezing mode includes the following S301-S306:

[0160] S301: When the heat pump unit is in standby mode, it is detected that the current ambient temperature is lower than the preset ambient temperature.

[0161] S302: Obtain the water flow of the antifreeze valve based on a preset detection cycle.

[0162] S303: Determine a water flow increase value of the acquired current water flow relative to the historical water flow acquired in the previous detection cycle.

[0163] S304: Determine whether the water flow increase value is greater than or equal to a preset threshold value. If so, execute S305; if not, return to execute S302.

[0164] S305: Determine whether the internal water temperature of the antifreeze valve is lower than a preset freezing water temperature threshold.

[0165] S306, controlling the heat pump unit to enter the anti-freeze mode from the standby mode.

[0166] In the embodiment of the present application, by detecting the change in the water flow rate of the antifreeze valve in the standby mode, the opening degree of the antifreeze valve can be more effectively determined, thereby indirectly obtaining the water temperature inside the antifreeze valve, improving the responsiveness of the heat pump unit to low temperature environments, reducing energy consumption and equipment loss, and improving the safety and reliability of the heat pump unit. At the same time, simplified control logic and reduced hardware requirements also bring cost savings and maintenance convenience.

[0167] In some embodiments, the above method further includes S221-S222:

[0168] S221. When the heat pump unit is in heating operation, obtain a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger.

[0169] S222: When it is detected that both the fourth water inlet temperature and the fourth water outlet temperature are not less than a preset shutdown temperature threshold, the heat pump unit is controlled to stop running.

[0170] In some embodiments, when the heat pump unit is in heating operation, the fourth water inlet temperature and the fourth water outlet temperature of the water-side heat exchanger may be acquired based on a preset cycle.

[0171] In some embodiments, when the heat pump unit is heating, the inlet and outlet temperatures of the water in the water-side heat exchanger are detected to evaluate the heating effect. When the heat pump unit is running and transferring heat, the fourth water inlet temperature and the fourth water outlet temperature are used to determine whether the heat pump unit has achieved the desired heating effect, that is, to determine whether the fourth water inlet temperature and the fourth water outlet temperature have reached the preset shutdown temperature threshold. If the fourth water inlet temperature and / or the fourth water outlet temperature are less than the preset shutdown temperature threshold, the new fourth water inlet temperature and the fourth water outlet temperature of the water-side heat exchanger are continuously obtained based on the preset cycle; if the fourth water inlet temperature and the fourth water outlet temperature are not less than the preset shutdown temperature threshold, it means that the water temperature is high enough to meet the heating requirements. At this time, the heat pump stops running to save energy and prevent overheating, effectively reducing energy consumption.

[0172] In some embodiments, the above method further includes S231:

[0173] S231. After the heat pump unit stops running, if it is detected that the water pump operation time reaches a third preset time, the water pump is controlled to stop running, and the heat pump unit is controlled to switch from the anti-freeze mode to the standby mode.

[0174] The water pump operation time may be the accumulated operation time of the water pump after the heat pump unit stops heating; and the third preset time may be a preset maximum operation time of the water pump when the heat pump unit is in heating operation.

[0175] In some embodiments, if the water pump operation time reaches a third preset time, it can be considered that the water flow circulation is sufficient, and the water pump is controlled to stop running to save energy.

[0176] In some embodiments, controlling the heat pump unit to switch from the anti-freeze mode to the standby mode means that after the risk of anti-freeze has passed, the heat pump unit no longer needs to continue to operate at full capacity and can be switched to a low-power standby mode.

[0177] In the embodiment of the present application, by setting the maximum operating time of the water pump (the third preset time length), the water pump is shut down when it is not necessary to continue running, thereby preventing excessive operation and effectively saving energy.

[0178] In some embodiments, the user-side terminal includes a display; the user-side terminal is used to obtain the operating parameters of the heat pump unit and display the operating parameters through the display, and the operating parameters include at least one of the following: water inlet temperature, water outlet temperature, water flow rate of the antifreeze valve, etc. of the water side heat exchanger.

[0179] In an embodiment of the present application, the user-side terminal can display the operating parameters of the heat pump unit during operation in real time so that the user can view them in real time. If an abnormality occurs, the user can promptly discover and perform troubleshooting or adjustments to avoid equipment damage or reduced efficiency due to accumulation of problems.

[0180] The following combination Figure 4 A control method for a heat pump unit provided in the present application is further described. Figure 4 The specific process of the control method of the heat pump unit includes the following S401-S415:

[0181] S401: When the heat pump unit is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, it is detected that the internal water temperature of the antifreeze valve is lower than a preset freezing water temperature threshold.

[0182] S402, controlling the heat pump unit to enter the anti-freeze mode from the standby mode, controlling the water pump to start running, and obtaining a first water inlet temperature and a first water outlet temperature of the water-side heat exchanger.

[0183] S403: After the water pump runs for a first preset time, obtain a current second water inlet temperature and a second water outlet temperature of the water-side heat exchanger.

[0184] S404, determining whether the second water inlet temperature and the second water outlet temperature meet the preset temperature increase condition, if so, executing S405, if not, executing S408.

[0185] S405, controlling the water pump to run for a second preset time and then shutting down the water pump, and controlling the heat pump unit to switch from the anti-freeze mode to the standby mode.

[0186] S406: collecting in real time the third water inlet temperature and the third water outlet temperature of the water-side heat exchanger in the current standby mode.

[0187] S407, determining whether the lowest temperature among the third water inlet temperature and the third water outlet temperature is lower than the target initial temperature, if so, returning to executing S402, if not, returning to executing S405.

[0188] Optionally, the above steps S401-S407 are consistent with the above steps S201-S204, and are not repeated here.

[0189] S408: Obtain the continuous operation time of the water pump.

[0190] S409, determining whether the continuous operation time reaches a preset time threshold, if so, executing S410, if not, returning to executing S403.

[0191] S410, controlling the heat pump unit to start heating operation.

[0192] Optionally, the above steps S408-S410 are consistent with the above steps S211-S214, and are not repeated here.

[0193] S411. Obtain a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger.

[0194] S412, detecting whether the fourth water inlet temperature and the fourth water outlet temperature are both not less than the preset shutdown temperature threshold, if so, executing S413, if not, returning to executing S411.

[0195] S413, control the heat pump unit to stop running.

[0196] Optionally, the above steps S411-S413 are consistent with the above steps S221-S222, and are not repeated here.

[0197] S414: Detect that the water pump operation time reaches a third preset time.

[0198] S415, controlling the water pump to stop running, and controlling the heat pump unit to switch from the anti-freeze mode to the standby mode.

[0199] Optionally, the above S414 is consistent with the above step S231, and will not be repeated here.

[0200] The embodiment of the present application realizes the anti-freezing protection of the heat pump unit in an automated manner, and intelligently adjusts the operation mode according to temperature changes and the running time of the water pump, thereby improving the operating efficiency and safety of the heat pump unit. The heat pump unit can prevent freezing in a low temperature environment, and at the same time, by accurately controlling the running time and energy consumption of the water pump, it achieves the goal of energy saving and extending the life of the equipment. Moreover, the automated and intelligent control method not only reduces human intervention and improves the user experience, but also enhances the stability and reliability of the heat pump unit.

[0201] An exemplary embodiment of the present application also provides another control method for a heat pump unit. The control method for the heat pump unit can be applied to the above processor. For details, please refer to Figure 5, which exemplarily shows a flow chart of another control method of a heat pump unit provided in an embodiment of the present application, wherein the heat pump unit includes a refrigerant circulation loop and a water circulation loop, wherein the refrigerant circulation loop includes a water-side heat exchanger, wherein the water circulation loop includes the water-side heat exchanger, an antifreeze valve, a water flow sensor and a water pump, wherein the water flow sensor is used to collect the water flow of the antifreeze valve, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger. Figure 5 As shown, the control method of the heat pump unit includes the following S501-S504:

[0202] S501. When the heat pump unit is in standby mode and the current ambient temperature is lower than the preset ambient temperature threshold, when it is detected that the increase in the current water flow of the antifreeze valve relative to the historical water flow in the previous detection cycle is greater than or equal to the preset threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water side heat exchanger are obtained.

[0203] Optionally, the water flow rate of the antifreeze valve can be collected by a water flow sensor. The water flow sensor is connected to the antifreeze valve, and the water flow sensor is used to collect the water flow rate of the antifreeze valve.

[0204] In some embodiments, when the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, the water flow of the antifreeze valve can be obtained based on a preset detection cycle, and the water flow increase value of the current water flow of the antifreeze valve relative to the historical water flow of the previous detection cycle can be determined; and then it is determined whether the water flow increase value is greater than or equal to the preset threshold.

[0205] The water flow sensor can detect the water flow through the antifreeze valve in real time. The real-time collected water flow data can accurately reflect the working status of the antifreeze valve, effectively improving the reliability of the heat pump unit operation.

[0206] S502: After the water pump runs for a first preset time, obtain the current second water inlet temperature and second water outlet temperature of the water-side heat exchanger.

[0207] Specifically, step S502 is consistent with step S202 described above, and will not be described in detail here.

[0208] S503, determining whether the second water inlet temperature and the second water outlet temperature meet the preset heating condition, and if so, controlling the water pump to run for a second preset time and then shutting down the water pump, and controlling the heat pump unit to switch from the anti-freeze mode to the standby mode.

[0209] Specifically, step S503 is consistent with step S203 described above, and will not be described in detail here.

[0210] S504. After the heat pump unit is switched from the anti-freeze mode to the standby mode, determine whether the lowest temperature between the third water inlet temperature and the third water outlet temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature. If so, control the heat pump unit to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature between the first water inlet temperature and the first water outlet temperature.

[0211] Specifically, step S504 is consistent with step S204 described above, and will not be described in detail here.

[0212] In the embodiment of the present application, the heat pump unit includes a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop includes a water-side heat exchanger, the water circulation loop includes a water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger; when the heat pump unit is in standby mode and the current ambient temperature is lower than the preset ambient temperature threshold, when it is detected that the water flow increase value of the current water flow of the antifreeze valve relative to the historical water flow of the previous detection cycle is greater than or equal to the preset threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, and the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger are obtained. ; After the water pump runs for the first preset time, the current second water inlet temperature and second water outlet temperature of the water side heat exchanger are obtained; it is determined whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising conditions. If so, the water pump is controlled to run for the second preset time and then shut down, and the heat pump unit is controlled to switch from the anti-freeze mode to the standby mode; after the heat pump unit switches from the anti-freeze mode to the standby mode, it is determined whether the lowest temperature of the third water inlet temperature and the third water outlet temperature of the water side heat exchanger in the current standby mode is less than the target initial temperature. If so, the heat pump unit is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first water inlet temperature and the first water outlet temperature. Therefore, by detecting the water flow increase value of the current water flow of the antifreeze valve relative to the historical water flow of the previous detection cycle, it is possible to quickly determine whether the system is facing the risk of freezing, thereby entering the anti-freeze mode in time to protect the water side heat exchanger and the water circulation pipeline from freezing damage. Moreover, after entering the anti-freeze mode for the first time, the subsequent anti-freeze mode switching can directly enter the anti-freeze mode according to the water temperature that first triggered the anti-freeze mode, avoiding the situation where the anti-freeze valve drains water multiple times and frequently enters the anti-freeze mode, effectively saving water resources, reducing the wear of the anti-freeze valve, and extending its service life. In addition, directly entering the anti-freeze mode can respond to low temperature environments more quickly, prevent equipment from freezing and damage, and improve the stability and reliability of the operation of the heat pump unit.

[0213] Please refer to the following Figure 6 , which is a schematic diagram of the structure of a control device of a heat pump unit provided by an exemplary embodiment of the present application, the heat pump unit includes a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop includes a water-side heat exchanger, the water circulation loop includes the water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger. Figure 6 As shown, the control device 600 of the heat pump unit includes:

[0214] The first control module 601 is used for controlling the heat pump unit to enter the antifreeze mode from the standby mode, and controlling the water pump to start running, and obtaining the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger when it is detected that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value when the heat pump unit is in the standby mode and the current ambient temperature is lower than the preset ambient temperature threshold value;

[0215] A first acquisition module 602 is used to acquire the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger after the water pump runs for a first preset time;

[0216] The first judgment module 603 is used to judge whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition, and if so, control the water pump to run for a second preset time and then turn off the water pump, and control the heat pump unit to switch from the anti-freezing mode to the standby mode;

[0217] The second judgment module 604 is used to judge whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature after the heat pump unit is switched from the anti-freeze mode to the standby mode. If so, the heat pump unit is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

[0218] In a possible implementation, the apparatus 600 further includes:

[0219] The third control module is used for controlling the water pump to run for a first period of time after the heat pump unit switches from the anti-freeze mode to the standby mode, and then returns to execute the step of determining whether the lowest temperature between the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature if the lowest temperature between the third inlet water temperature and the third outlet water temperature is not lower than the target initial temperature.

[0220] In a possible implementation, the apparatus 600 further includes:

[0221] A first determination module is used for, when the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, obtaining the water flow of the antifreeze valve based on a preset detection cycle, and determining a water flow increase value of the obtained current water flow relative to a historical water flow obtained in a previous detection cycle;

[0222] The fifth judgment module is used to judge whether the water flow increase value is greater than or equal to a preset threshold value. If so, it is determined that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value.

[0223] In a possible implementation, the apparatus 600 further includes:

[0224] A third acquisition module is used to acquire the continuous operation time of the water pump when the second water inlet temperature and the second water outlet temperature do not meet the preset temperature increase condition;

[0225] A sixth judgment module is used to judge whether the above-mentioned continuous operation time reaches a preset time threshold;

[0226] The fourth control module is used to control the water pump to continue running for the first preset time period when the above-mentioned continuous operation time period does not reach the above-mentioned preset time period threshold, and then return to execute the above-mentioned step of determining whether the above-mentioned second water inlet temperature and the above-mentioned second water outlet temperature meet the preset heating conditions.

[0227] In a possible implementation, the apparatus 600 further includes:

[0228] The fifth control module is used to control the heat pump unit to start heating operation when the continuous operation time reaches the preset time threshold.

[0229] In a possible implementation, the apparatus 600 further includes:

[0230] A fourth acquisition module, used for acquiring a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger when the heat pump unit is in heating operation;

[0231] The sixth control module is used to control the heat pump unit to stop running when it is detected that the fourth water inlet temperature and the fourth water outlet temperature are not less than a preset shutdown temperature threshold.

[0232] In a possible implementation, the apparatus 600 further includes:

[0233] The seventh control module is used to control the water pump to stop running and control the heat pump unit to switch from the anti-freeze mode to the standby mode after the heat pump unit stops running if it is detected that the running time of the water pump reaches a third preset time.

[0234] In a possible implementation, the antifreeze valve is used to detect the internal water temperature of the antifreeze valve, and control the antifreeze valve to open when the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold to drain water.

[0235] In a possible implementation, the water outlet of the water side heat exchanger is provided with an outlet water temperature sensing bag, and the water inlet of the water side heat exchanger is provided with an inlet water temperature sensing bag. The outlet water temperature sensing bag is used to collect the outlet water temperature of the water side heat exchanger, and the inlet water temperature sensing bag is used to collect the inlet water temperature of the water side heat exchanger.

[0236] In a possible implementation, the heat pump unit further includes a water flow sensor, which is connected to the antifreeze valve and is used to collect the water flow of the antifreeze valve.

[0237] In a possible implementation, the heat pump unit further includes a user-side terminal, and the user-side terminal includes a display;

[0238] The user-side terminal is used to obtain the operating parameters of the heat pump unit and display the operating parameters through the display.

[0239] The division of each module in the control device 600 of the heat pump unit is only for illustration. In other embodiments, the control device of the heat pump unit can be divided into different modules as needed to complete all or part of the functions of the control device of the heat pump unit. The implementation of each module in the control device of the heat pump unit provided in the embodiment of this specification can be in the form of a computer program. The computer program can be run on a terminal or a server. The program modules constituted by the computer program can be stored in the memory of the terminal or the server. When the computer program is executed by the processor, all or part of the steps of the control method of the heat pump unit described in the embodiment of this specification are implemented.

[0240] Please refer to the following Figure 7 , which is a structural schematic diagram of another control device of a heat pump unit provided by an exemplary embodiment of the present application, the heat pump unit includes a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop includes a water-side heat exchanger, the water circulation loop includes the water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger. Figure 7 As shown, the control device 700 of the heat pump unit includes:

[0241] The second control module 701 is used for controlling the heat pump unit to enter the anti-freeze mode from the standby mode, and controlling the water pump to start running, and obtaining the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger when it is detected that the water flow increase value of the current water flow of the anti-freeze valve relative to the historical water flow of the previous detection cycle is greater than or equal to the preset threshold value when the heat pump unit is in the standby mode and the current ambient temperature is lower than the preset ambient temperature threshold;

[0242] The second acquisition module 702 is used to acquire the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger after the water pump runs for a first preset time;

[0243] The third judgment module 703 is used to judge whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition. If so, the water pump is controlled to run for a second preset time and then turned off, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode.

[0244] The fourth judgment module 704 is used to judge whether the lowest temperature of the third water inlet temperature and the third water outlet temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature after the heat pump unit is switched from the anti-freeze mode to the standby mode. If so, the heat pump unit is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first water inlet temperature and the first water outlet temperature.

[0245] In a possible implementation, the apparatus 700 further includes:

[0246] The eighth control module is used for controlling the water pump to run for a first period of time after the heat pump unit is switched from the anti-freeze mode to the standby mode, and then returning to execute the step of determining whether the lowest temperature between the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature if the lowest temperature between the third inlet water temperature and the third outlet water temperature is not lower than the target initial temperature.

[0247] In a possible implementation, the apparatus 700 further includes:

[0248] A third determination module is used for, when the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, obtaining the water flow of the antifreeze valve based on a preset detection cycle, and determining a water flow increase value of the obtained current water flow relative to a historical water flow obtained in a previous detection cycle;

[0249] The seventh judgment module is used to judge whether the water flow increase value is greater than or equal to a preset threshold value. If so, it is determined that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value.

[0250] In a possible implementation, the apparatus 700 further includes:

[0251] A fifth acquisition module, configured to acquire the continuous operation time of the water pump when the second water inlet temperature and the second water outlet temperature do not satisfy the preset temperature increase condition;

[0252] An eighth judgment module is used to judge whether the above-mentioned continuous operation time reaches a preset time threshold;

[0253] The fourth control module is used to control the water pump to continue running for the first preset time period when the above-mentioned continuous operation time period does not reach the above-mentioned preset time period threshold, and then return to execute the above-mentioned step of determining whether the above-mentioned second water inlet temperature and the above-mentioned second water outlet temperature meet the preset heating conditions.

[0254] In a possible implementation, the apparatus 700 further includes:

[0255] The ninth control module is used to control the heat pump unit to start heating operation when the continuous operation time reaches the preset time threshold.

[0256] In a possible implementation, the apparatus 700 further includes:

[0257] a sixth acquisition module, configured to acquire a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger when the heat pump unit is in heating operation;

[0258] The tenth control module is used to control the heat pump unit to stop running when it is detected that the fourth water inlet temperature and the fourth water outlet temperature are not less than a preset shutdown temperature threshold.

[0259] In a possible implementation, the apparatus 700 further includes:

[0260] The eleventh control module is used for controlling the water pump to stop running and controlling the heat pump unit to switch from the anti-freeze mode to the standby mode after the heat pump unit stops running if it is detected that the running time of the water pump reaches a third preset time.

[0261] See next Figure 8 , which is a schematic diagram of the structure of a heat pump unit provided by an exemplary embodiment of the present application. Figure 8As shown, the heat pump unit 800 may include: a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop includes a water-side heat exchanger, the water circulation loop includes the water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger; it may also include a processor 810 and a memory 820, a user interface 830, a network interface 840 and a communication bus 850.

[0262] Among them, the processor 810 may include one or more processing cores. The processor 810 uses various interfaces and lines to connect various parts in the entire heat pump unit 800, and executes various functions and processes data of the heat pump unit 800 by running or executing instructions, programs, code sets or instruction sets stored in the memory 820, and calling data stored in the memory 820. Optionally, the processor 810 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 810 can integrate one or a combination of a central processing unit (Central Processing Unit, CPU), a graphics processing unit (Graphics Processing Unit, GPU) and a modem. Among them, the CPU mainly processes the operating system and application programs; the GPU is responsible for rendering and drawing the content to be displayed on the display screen; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 810, but implemented separately through a chip.

[0263] The memory 820 may include a random access memory (RAM) or a read-only memory (Read-Only Memory). Optionally, the memory 820 includes a non-transitory computer-readable storage medium. The memory 820 may be used to store instructions, programs, codes, code sets, or instruction sets. The memory 820 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a receiving function, a control function, etc.), instructions for implementing the above-mentioned method embodiments, etc.; the data storage area may store data involved in the above-mentioned method embodiments, etc. The memory 820 may optionally be at least one storage device located away from the aforementioned processor 810. As Figure 8 As shown, the memory 820 as a computer storage medium may include an operating system, a network communication module, a user interface module, and program instructions.

[0264] Optionally, the communication bus 850 is used to achieve connection and communication between these components. The user interface 830 may include a display screen (Display), a camera (Camera), and may also include a standard wired interface and a wireless interface; the network interface 840 may optionally include a standard wired interface and a wireless interface (such as a Wi-Fi interface).

[0265] exist Figure 8 In the heat pump unit 800 shown, the processor 810 can be used to call the program instructions stored in the memory 820 and specifically perform the following operations:

[0266] When the heat pump unit is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that the internal water temperature of the antifreeze valve is lower than a preset freezing water temperature threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger are obtained;

[0267] After the water pump runs for a first preset time, obtaining the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger;

[0268] Determine whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition, and if so, control the water pump to run for a second preset time and then turn off the water pump, and control the heat pump unit to switch from the anti-freeze mode to the standby mode;

[0269] After the heat pump unit is switched from the anti-freeze mode to the standby mode, determine whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature; if so, control the heat pump unit to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

[0270] In a possible implementation, the method further includes:

[0271] After the heat pump unit switches from the anti-freeze mode to the standby mode, if the lowest temperature between the third water inlet temperature and the third water outlet temperature is not less than the target initial temperature, the water pump is controlled to run for a first period of time, and then returns to execute the step of determining whether the lowest temperature between the third water inlet temperature and the third water outlet temperature of the water side heat exchanger in the current standby mode is less than the target initial temperature.

[0272] In a possible implementation, the method further includes:

[0273] When the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, the water flow rate of the antifreeze valve is obtained based on a preset detection cycle, and a water flow rate increase value of the obtained current water flow rate relative to the historical water flow rate obtained in the previous detection cycle is determined;

[0274] It is determined whether the water flow increase value is greater than or equal to a preset threshold value. If so, it is determined that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value.

[0275] In a possible implementation, the method further includes:

[0276] When the second water inlet temperature and the second water outlet temperature do not satisfy the preset temperature increase condition, obtaining the continuous operation time of the water pump;

[0277] Determine whether the above continuous operation time reaches a preset time threshold;

[0278] When the continuous operation time does not reach the preset time threshold, the water pump is controlled to continue to run for the first preset time, and then returns to execute the step of determining whether the second water inlet temperature and the second water outlet temperature meet the preset heating conditions.

[0279] In a possible implementation, the method further includes:

[0280] When the continuous operation time reaches the preset time threshold, the heat pump unit is controlled to start heating operation.

[0281] In a possible implementation, the method further includes:

[0282] When the heat pump unit is in heating operation, obtaining a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger;

[0283] When it is detected that both the fourth water inlet temperature and the fourth water outlet temperature are not less than the preset shutdown temperature threshold, the heat pump unit is controlled to stop running.

[0284] In a possible implementation, the method further includes:

[0285] After the heat pump unit stops running, if it is detected that the water pump operation time reaches a third preset time, the water pump is controlled to stop running, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode.

[0286] In a possible implementation, the antifreeze valve is used to detect the internal water temperature of the antifreeze valve, and control the antifreeze valve to open when the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold to drain water.

[0287] In a possible implementation, the water outlet of the water side heat exchanger is provided with an outlet water temperature sensing bag, and the water inlet of the water side heat exchanger is provided with an inlet water temperature sensing bag. The outlet water temperature sensing bag is used to collect the outlet water temperature of the water side heat exchanger, and the inlet water temperature sensing bag is used to collect the inlet water temperature of the water side heat exchanger.

[0288] In a possible implementation, the heat pump unit further includes a water flow sensor, which is connected to the antifreeze valve and is used to collect the water flow of the antifreeze valve.

[0289] In a possible implementation, the heat pump unit further includes a user-side terminal, and the user-side terminal includes a display;

[0290] The user-side terminal is used to obtain the operating parameters of the heat pump unit and display the operating parameters through the display.

[0291] exist Figure 8 In the heat pump unit 800 shown, the processor 810 can also be used to call the program instructions stored in the memory 820 and specifically perform the following operations:

[0292] When the heat pump unit is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that the water flow increase value of the current water flow of the antifreeze valve relative to the historical water flow of the previous detection cycle is greater than or equal to the preset threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger are obtained;

[0293] After the water pump runs for a first preset time, obtaining the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger;

[0294] Determine whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition, and if so, control the water pump to run for a second preset time and then turn off the water pump, and control the heat pump unit to switch from the anti-freeze mode to the standby mode;

[0295] After the heat pump unit is switched from the anti-freeze mode to the standby mode, determine whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature; if so, control the heat pump unit to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

[0296] In a possible implementation, the method further includes:

[0297] After the heat pump unit switches from the anti-freeze mode to the standby mode, if the lowest temperature between the third water inlet temperature and the third water outlet temperature is not less than the target initial temperature, the water pump is controlled to run for a first period of time, and then returns to execute the step of determining whether the lowest temperature between the third water inlet temperature and the third water outlet temperature of the water side heat exchanger in the current standby mode is less than the target initial temperature.

[0298] In a possible implementation, the method further includes:

[0299] When the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, the water flow rate of the antifreeze valve is obtained based on a preset detection cycle, and a water flow rate increase value of the current water flow rate of the antifreeze valve relative to the historical water flow rate of the previous detection cycle is determined;

[0300] Determine whether the water flow increase value is greater than or equal to the preset threshold.

[0301] In a possible implementation, the method further includes:

[0302] When the second water inlet temperature and the second water outlet temperature do not satisfy the preset temperature increase condition, obtaining the continuous operation time of the water pump;

[0303] Determine whether the above continuous operation time reaches a preset time threshold;

[0304] When the continuous operation time does not reach the preset time threshold, the water pump is controlled to continue to run for the first preset time, and then returns to execute the step of determining whether the second water inlet temperature and the second water outlet temperature meet the preset heating conditions.

[0305] In a possible implementation, the method further includes:

[0306] When the continuous operation time reaches the preset time threshold, the heat pump unit is controlled to start heating operation.

[0307] In a possible implementation, the method further includes:

[0308] When the heat pump unit is in heating operation, obtaining a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger;

[0309] When it is detected that both the fourth water inlet temperature and the fourth water outlet temperature are not less than the preset shutdown temperature threshold, the heat pump unit is controlled to stop running.

[0310] In a possible implementation, the method further includes:

[0311] After the heat pump unit stops running, if it is detected that the water pump operation time reaches a third preset time, the water pump is controlled to stop running, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode.

[0312] The present application also provides a computer-readable storage medium, which stores instructions, and when the instructions are executed on a computer or a processor, the computer or the processor executes one or more steps in the above embodiment. If the various component modules of the control device of the heat pump unit are implemented in the form of software functional units and sold or used as independent products, they can be stored in the above computer-readable storage medium.

[0313] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The above-mentioned computer program product includes one or more computer instructions. When the above-mentioned computer program instructions are loaded and executed on a computer, the above-mentioned process or function according to the embodiment of the present application is generated in whole or in part. The above-mentioned computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. The above-mentioned computer instructions can be stored in a computer-readable storage medium or transmitted by the above-mentioned computer-readable storage medium. The above-mentioned computer instructions can be transmitted from a website site, a computer, a server or a data center to another website site, a computer, a server or a data center by wired (such as coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The above-mentioned computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrated. The above-mentioned available media can be magnetic media (for example, floppy disks, hard disks, tapes), optical media (for example, digital versatile discs (DVD)), or semiconductor media (for example, solid state disks (SSD)), etc.

[0314] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes. In the absence of conflict, the technical features in this embodiment and the implementation scheme can be combined arbitrarily.

[0315] The above-mentioned embodiments are merely preferred embodiments of the present application and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary technicians in this field should fall within the protection scope determined by the claims of the present application.

Claims

1. A control method for a heat pump unit, characterized in that: The heat pump unit includes a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop includes a water-side heat exchanger, the water circulation loop includes the water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger; the control method includes: When the heat pump unit is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that the internal water temperature of the antifreeze valve is lower than a preset freezing water temperature threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger are obtained; After the water pump runs for a first preset time, obtaining a current second water inlet temperature and a second water outlet temperature of the water-side heat exchanger; Determine whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition, and if so, control the water pump to run for a second preset time and then turn off the water pump, and control the heat pump unit to switch from the anti-freeze mode to the standby mode; After the heat pump unit is switched from the anti-freeze mode to the standby mode, it is determined whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature; if so, the heat pump unit is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

2. The method according to claim 1, characterized in that The method further comprises: After the heat pump unit switches from the anti-freeze mode to the standby mode, if the lowest temperature between the third water inlet temperature and the third water outlet temperature is not less than the target initial temperature, the water pump is controlled to run for a first period of time, and then returns to the step of determining whether the lowest temperature between the third water inlet temperature and the third water outlet temperature of the water-side heat exchanger in the current standby mode is less than the target initial temperature.

3. The method according to claim 1, characterized in that The method further comprises: When the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, the water flow rate of the antifreeze valve is obtained based on a preset detection cycle, and a water flow rate increase value of the obtained current water flow rate relative to the historical water flow rate obtained in the previous detection cycle is determined; It is determined whether the water flow increase value is greater than or equal to a preset threshold value. If so, it is determined that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value.

4. The method according to claim 1, characterized in that The method further comprises: When the second water inlet temperature and the second water outlet temperature do not satisfy the preset temperature increase condition, obtaining the continuous operation time of the water pump; Determine whether the continuous operation time reaches a preset time threshold; When the continuous operation time does not reach the preset time threshold, the water pump is controlled to continue running for the first preset time, and then returns to the step of determining whether the second water inlet temperature and the second water outlet temperature meet the preset heating condition.

5. The method according to claim 4, characterized in that The method further comprises: When the continuous operation time reaches the preset time threshold, the heat pump unit is controlled to start heating operation.

6. The method according to claim 5, characterized in that The method further comprises: When the heat pump unit is in heating operation, obtaining a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger; When it is detected that both the fourth water inlet temperature and the fourth water outlet temperature are not less than the preset shutdown temperature threshold, the heat pump unit is controlled to stop running.

7. The method according to claim 5, characterized in that The method further comprises: After the heat pump unit stops running, if it is detected that the water pump operation time reaches a third preset time, the water pump is controlled to stop running, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode.

8. The method according to claim 1, characterized in that The antifreeze valve is used to detect the internal water temperature of the antifreeze valve, and control the antifreeze valve to open when the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold to drain water.

9. The method according to claim 1, characterized in that The water outlet of the water side heat exchanger is provided with an outlet water temperature sensing bag, and the water inlet of the water side heat exchanger is provided with an inlet water temperature sensing bag. The outlet water temperature sensing bag is used to collect the outlet water temperature of the water side heat exchanger, and the inlet water temperature sensing bag is used to collect the inlet water temperature of the water side heat exchanger.

10. The method according to claim 1, characterized in that The heat pump unit further comprises a water flow sensor, which is connected to the antifreeze valve and is used to collect the water flow of the antifreeze valve.

11. The method according to claim 1, characterized in that The heat pump unit further includes a user-side terminal, and the user-side terminal includes a display; The user-side terminal is used to obtain the operating parameters of the heat pump unit and display the operating parameters through the display.

12. A control method for a heat pump unit, characterized in that: The heat pump unit comprises a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop comprises a water-side heat exchanger, the water circulation loop comprises the water-side heat exchanger, an antifreeze valve, a water flow sensor and a water pump, the water flow sensor is used to collect the water flow of the antifreeze valve, the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger; the control method comprises: When the heat pump unit is in standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that the water flow increase value of the current water flow of the antifreeze valve relative to the historical water flow of the previous detection cycle is greater than or equal to the preset threshold, the heat pump unit is controlled to enter the antifreeze mode from the standby mode, the water pump is controlled to start running, and the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger are obtained; After the water pump runs for a first preset time, obtaining a current second water inlet temperature and a second water outlet temperature of the water-side heat exchanger; Determine whether the second water inlet temperature and the second water outlet temperature meet the preset temperature rising condition, and if so, control the water pump to run for a second preset time and then turn off the water pump, and control the heat pump unit to switch from the anti-freeze mode to the standby mode; After the heat pump unit is switched from the anti-freeze mode to the standby mode, it is determined whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature; if so, the heat pump unit is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

13. The method according to claim 12, characterized in that The method further comprises: After the heat pump unit switches from the anti-freeze mode to the standby mode, if the lowest temperature between the third water inlet temperature and the third water outlet temperature is not less than the target initial temperature, the water pump is controlled to run for a first period of time, and then returns to the step of determining whether the lowest temperature between the third water inlet temperature and the third water outlet temperature of the water-side heat exchanger in the current standby mode is less than the target initial temperature.

14. The method according to claim 12, characterized in that The method further comprises: When the heat pump unit is in the standby mode, when it is detected that the current ambient temperature is lower than the preset ambient temperature, the water flow rate of the antifreeze valve is obtained based on a preset detection cycle, and a water flow rate increase value of the current water flow rate of the antifreeze valve relative to the historical water flow rate of the previous detection cycle is determined; Determine whether the water flow increase value is greater than or equal to the preset threshold.

15. The method according to claim 12, characterized in that The method further comprises: When the second water inlet temperature and the second water outlet temperature do not satisfy the preset temperature increase condition, obtaining the continuous operation time of the water pump; Determine whether the continuous operation time reaches a preset time threshold; When the continuous operation time does not reach the preset time threshold, the water pump is controlled to continue running for the first preset time, and then returns to the step of determining whether the second water inlet temperature and the second water outlet temperature meet the preset heating condition.

16. The method according to claim 15, characterized in that The method further comprises: When the continuous operation time reaches the preset time threshold, the heat pump unit is controlled to start heating operation.

17. The method according to claim 16, characterized in that The method further comprises: When the heat pump unit is in heating operation, obtaining a fourth water inlet temperature and a fourth water outlet temperature of the water-side heat exchanger; When it is detected that both the fourth water inlet temperature and the fourth water outlet temperature are not less than the preset shutdown temperature threshold, the heat pump unit is controlled to stop running.

18. The method according to claim 16, characterized in that The method further comprises: After the heat pump unit stops running, if it is detected that the water pump operation time reaches a third preset time, the water pump is controlled to stop running, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode.

19. A control device for a heat pump unit, characterized in that: The heat pump unit comprises a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop comprises a water-side heat exchanger, the water circulation loop comprises the water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger; the control device comprises: A first control module is used for controlling the heat pump unit to enter the antifreeze mode from the standby mode, and controlling the water pump to start running, and obtaining the first water inlet temperature and the first water outlet temperature of the water-side heat exchanger when it is detected that the internal water temperature of the antifreeze valve is lower than the preset freezing water temperature threshold value when the heat pump unit is in the standby mode and the current ambient temperature is lower than the preset ambient temperature threshold value; A first acquisition module, used for acquiring the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger after the water pump runs for a first preset time; a first judgment module, configured to judge whether the second water inlet temperature and the second water outlet temperature meet a preset temperature rise condition, and if so, control the water pump to run for a second preset time and then shut down the water pump, and control the heat pump unit to switch from the anti-freeze mode to the standby mode; The second judgment module is used to judge whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature after the heat pump unit is switched from the anti-freeze mode to the standby mode. If so, the heat pump unit is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

20. A control device for a heat pump unit, characterized in that: The heat pump unit comprises a refrigerant circulation loop and a water circulation loop, wherein the refrigerant circulation loop comprises a water-side heat exchanger, and the water circulation loop comprises the water-side heat exchanger, an antifreeze valve, a water flow sensor and a water pump, wherein the water flow sensor is used to collect the water flow of the antifreeze valve, and the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger; the control device comprises: A second control module is used for controlling the heat pump unit to enter the antifreeze mode from the standby mode, and controlling the water pump to start running, and obtaining the first water inlet temperature and the first water outlet temperature of the water side heat exchanger when it is detected that the water flow increase value of the current water flow of the antifreeze valve relative to the historical water flow of the previous detection cycle is greater than or equal to the preset threshold value when the heat pump unit is in the standby mode and the current ambient temperature is lower than the preset ambient temperature threshold; A second acquisition module, used for acquiring a current second water inlet temperature and a second water outlet temperature of the water-side heat exchanger after the water pump runs for a first preset time; a third judgment module, for judging whether the second water inlet temperature and the second water outlet temperature meet a preset temperature rise condition, and if so, controlling the water pump to run for a second preset time and then shutting down the water pump, and controlling the heat pump unit to switch from the anti-freeze mode to the standby mode; The fourth judgment module is used to judge whether the lowest temperature of the third inlet water temperature and the third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than the target initial temperature after the heat pump unit is switched from the anti-freeze mode to the standby mode. If so, the heat pump unit is controlled to switch from the standby mode to the anti-freeze mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

21. A heat pump unit, characterized in that: The heat pump unit comprises: a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop comprises a water-side heat exchanger, the water circulation loop comprises the water-side heat exchanger, an antifreeze valve and a water pump, and the refrigerant circulation loop and the water circulation loop perform heat exchange through the water-side heat exchanger; The heat pump unit is used to operate according to the control method for a heat pump unit according to any one of claims 1-18.

22. A computer storage medium, characterized in that The computer storage medium stores a plurality of instructions, which are suitable for being loaded by a processor and executing the steps of the method according to any one of claims 1 to 18.

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