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

Abstract

The application provides a control method and device of a heat pump unit, the heat pump unit and a computer storage medium, wherein the method comprises: when it is detected that the internal water temperature of an anti-freezing valve is lower than a preset freezing water temperature threshold, the heat pump unit enters an anti-freezing mode from a standby mode, a water pump starts to operate, and a first water inlet temperature and a first water outlet temperature of a water side heat exchanger are acquired; after the water pump operates for a first preset time length, if a current second water inlet temperature and a second water outlet temperature of the water side heat exchanger satisfy a preset temperature rising condition, the water pump is controlled to operate for a second preset time length and then is closed, and the heat pump unit is switched to the standby mode; and it is judged whether the lowest temperature of a current third water inlet temperature and a third water outlet temperature of the water side heat exchanger is less than a target initial temperature, if yes, the heat pump unit is switched to 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. The embodiments provided in the application can improve the stability and reliability of the heat pump unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump units, and particularly relates to a control method and device of a heat pump unit, the heat pump unit and a computer storage medium. BACKGROUND

[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 refrigerant, and water is extremely easy to freeze into ice at low temperature, so the water side heat exchanger of such a heat pump unit has the problem of anti-freezing in cold weather.

[0003] In the related art, the heat pump unit is usually controlled to enter an anti-freezing mode by comparing the water temperature in and out of the water side heat exchanger with a temperature threshold value, however, unreasonable setting of the temperature threshold value may cause the heat pump unit to frequently enter the anti-freezing mode, or cause the water side heat exchanger and the water circuit to have the risk of freezing and cracking, thereby causing the heat pump unit to have low stability in operation. SUMMARY

[0004] The embodiments of the present application provide a control method and device of a heat pump unit, the 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 the first aspect, the embodiments of the present application provide a control method of a heat pump unit, wherein the heat pump unit includes a refrigerant circulation loop and a water circulation loop, the water side heat exchanger is included in the refrigerant circulation loop, the water side heat exchanger, an anti-freezing valve and a water pump are included in the water circulation loop, the refrigerant circulation loop and the water circulation loop exchange heat through the water side heat exchanger, and the method includes:

[0006] In the case that the heat pump unit is in a standby mode and the current environmental temperature is lower than a preset environmental temperature threshold value, when it is detected that the internal water temperature of the anti-freezing valve is lower than a preset freezing water temperature threshold value, the heat pump unit is controlled to enter an anti-freezing mode from the standby mode, the water pump is controlled to start operation, and the first water inlet temperature and the first water outlet temperature of the water side heat exchanger are acquired;

[0007] After the water pump operates for a first preset time length, the current second water inlet temperature and the second water outlet temperature of the water side heat exchanger are acquired;

[0008] It is judged whether the second water inlet temperature and the second water outlet temperature satisfy a preset temperature rising condition, if yes, the water pump is controlled to be closed after operating for a second preset time length, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode;

[0009] 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 inlet water temperature and the third outlet water temperature of the water side heat exchanger in the current standby mode is less than a target initial temperature, and if so, the heat pump unit is switched from the standby mode to the anti-freezing 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 is switched from the anti-freezing mode to the standby mode, if the third inlet water temperature and / or the third outlet water temperature is not less than the target initial temperature, the water pump is controlled to run for a first time length, and then the step of determining 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 less than the target initial temperature is performed.

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

[0013] When it is detected that the current environment temperature is lower than the preset environment temperature, the water flow of the anti-freezing valve is obtained based on a preset detection period, and a water flow increase value of the obtained current water flow relative to a historical water flow obtained in a previous detection period is determined.

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

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

[0016] When the second inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rise condition, a continuous running time length of the water pump is obtained.

[0017] It is determined whether the continuous running time length reaches a preset time length threshold value.

[0018] When the continuous running time length does not reach the preset time length threshold value, the water pump is controlled to continue running for a first preset time length, and then the step of determining whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rise condition is performed.

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

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

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

[0022] In the case where the heat pump unit is in the heating operation, a fourth inlet water temperature and a fourth outlet water temperature of the water-side heat exchanger are obtained.

[0023] When it is detected that the fourth inlet water temperature and the fourth outlet water temperature are both not less than a 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 runs for a third preset time length, 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 anti-freezing valve is configured to detect an internal water temperature of the anti-freezing valve, and control the anti-freezing valve to open to drain water when the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold.

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

[0028] In a possible implementation, the heat pump unit further includes a water flow sensor, the water flow sensor is connected to the anti-freezing valve, and the water flow sensor is configured to collect a water flow of the anti-freezing 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 configured to obtain an operation parameter of the heat pump unit, and display the operation parameter on the display.

[0031] In a second aspect, an embodiment of the present application provides a control method of a heat pump unit, the heat pump unit including a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop including a water-side heat exchanger, the water circulation loop including the water-side heat exchanger, an anti-freezing valve, a water flow sensor, and a water pump, the water flow sensor being configured to collect a water flow of the anti-freezing valve, the refrigerant circulation loop and the water circulation loop being configured to exchange heat through the water-side heat exchanger; the control method including:

[0032] In the case that the heat pump unit is in the 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 freeze prevention valve relative to the historical water flow of the last detection cycle is greater than or equal to the preset threshold, the heat pump unit is controlled to enter the freeze prevention mode from the standby mode, the water pump is controlled to start running, and the first inlet water temperature and the first outlet water temperature of the water side heat exchanger are obtained;

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

[0034] It is judged whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rise condition, and if yes, the water pump is controlled to be closed after running for a second preset time length, and the heat pump unit is controlled to switch from the freeze prevention mode to the standby mode;

[0035] After the heat pump unit switches from the freeze prevention mode to the standby mode, it is judged 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 less than a target initial temperature, and if yes, the heat pump unit is controlled to switch from the standby mode to the freeze prevention 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 freeze prevention mode to the standby mode, if the lowest temperature of the third inlet water temperature and the third outlet water temperature is not less than the target initial temperature, the water pump is controlled to run for a first time length, and then the step of judging 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 less than the target initial temperature is executed.

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

[0039] In the case that 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 freeze prevention valve is obtained based on a preset detection cycle, and the water flow increase value of the current water flow of the freeze prevention valve relative to the historical water flow of the last detection cycle is determined.

[0040] It is judged 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] In a case where the second inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rise condition, a duration of continuous operation of the water pump is obtained;

[0043] It is judged whether the duration of continuous operation reaches a preset duration threshold;

[0044] In a case where the duration of continuous operation does not reach the preset duration threshold, after the water pump is controlled to continue to operate for a first preset duration, it is returned to the step of judging whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rise condition.

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

[0046] In a case where the duration of continuous operation reaches the preset duration threshold, the heat pump unit is controlled to start heating operation.

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

[0048] In a case where the heat pump unit performs heating operation, a fourth inlet water temperature and a fourth outlet water temperature of the water-side heat exchanger are obtained;

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

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

[0051] After the heat pump unit stops operation, if it is detected that the duration of operation of the water pump reaches a third preset duration, the water pump is controlled to stop operation, 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 of a heat pump unit, the heat pump unit including a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop including a water-side heat exchanger, the water circulation loop including the water-side heat exchanger, an anti-freezing valve and a water pump, and the refrigerant circulation loop and the water circulation loop performing heat exchange through the water-side heat exchanger; the device includes:

[0053] A first control module is configured to, in a case where the heat pump unit is in a standby mode and a current ambient temperature is lower than a preset ambient temperature threshold, when it is detected that an internal water temperature of the anti-freezing valve is lower than a preset freezing water temperature threshold, control the heat pump unit to switch from the standby mode to an anti-freezing mode, control the water pump to start operation, and obtain a first inlet water temperature and a first outlet water temperature of the water-side heat exchanger;

[0054] The first obtaining module is configured to obtain a second inlet water temperature and a second outlet water temperature of the water-side heat exchanger after the water pump is operated for a first preset time length.

[0055] The first determining module is configured to determine whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rising condition, and if so, control the water pump to be turned off after being operated for a second preset time length, and control the heat pump unit to be switched from the anti-freezing mode to the standby mode.

[0056] The second determining module is configured to determine whether a lowest temperature of a third inlet water temperature and a third outlet water temperature of the water-side heat exchanger in the current standby mode is less than a target initial temperature after the heat pump unit is switched from the anti-freezing mode to the standby mode, and if so, control the heat pump unit to be switched from the standby mode to the anti-freezing mode, where the target initial temperature is a highest temperature of the first inlet water temperature and the first outlet water temperature.

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

[0058] The third control module is configured to, after the heat pump unit is switched from the anti-freezing mode to the standby mode, if the lowest temperature of the third inlet water temperature and the third outlet water temperature is not less than the target initial temperature, control the water pump to be operated for a first time length, and then return to execute the step of determining whether the lowest temperature of the third inlet water temperature and the third outlet water temperature in the current standby mode is less than the target initial temperature.

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

[0060] The first determining module is configured to, when the heat pump unit is in the standby mode, and when it is detected that the current environment temperature is lower than the preset environment temperature, obtain a water flow of the anti-freezing valve based on a preset detection period, and determine a water flow increase value of a current water flow relative to a historical water flow obtained in a previous detection period.

[0061] The fifth determining module is configured to determine whether the water flow increase value is greater than or equal to a preset threshold value, and if so, determine that the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold value.

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

[0063] The third obtaining module is configured to, in a case where the second inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rising condition, obtain a continuous operation time length of the water pump.

[0064] a sixth determining module, configured to determine whether the continuous running duration reaches a preset duration threshold;

[0065] a fourth control module, configured to, in a case where the continuous running duration does not reach the preset duration threshold, control the water pump to continue running for a first preset duration, and then return to execute the step of determining whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rising condition.

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

[0067] a fifth control module, configured to, in a case where the continuous running duration reaches the preset duration threshold, control the heat pump unit to start heating operation.

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

[0069] a fourth acquisition module, configured to, in a case where the heat pump unit performs heating operation, acquire a fourth inlet water temperature and a fourth outlet water temperature of the water-side heat exchanger;

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

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

[0072] a seventh control module, configured to, after the heat pump unit stops running, if it is detected that the water pump running duration reaches a third preset duration, control the water pump to stop running, and control the heat pump unit to switch from the anti-freezing mode to the standby mode.

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

[0074] In a possible implementation, the outlet of the water-side heat exchanger is provided with an outlet temperature sensing bulb, and the inlet of the water-side heat exchanger is provided with an inlet temperature sensing bulb, the outlet temperature sensing bulb is configured to collect the outlet water temperature of the water-side heat exchanger, and the inlet temperature sensing bulb is configured 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, the water flow sensor is connected to the anti-freezing valve, and the water flow sensor is configured to collect the water flow of the anti-freezing 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 configured to acquire an operating parameter of the heat pump unit and display the operating parameter on the display.

[0078] In a fourth aspect, an embodiment of the present application provides a control device of a heat pump unit, the heat pump unit including a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop including a water-side heat exchanger, the water circulation loop including the water-side heat exchanger, a freeze-proof valve, and a water pump, and the refrigerant circulation loop and the water circulation loop exchanging heat through the water-side heat exchanger; and the control device including:

[0079] A second control module is configured to, when the heat pump unit is in a standby mode and a current ambient temperature is lower than a preset ambient temperature threshold, control the heat pump unit to switch from the standby mode to a freeze-proof mode and control the water pump to start operating when a water flow increase value of a current water flow of the freeze-proof valve relative to a historical water flow of a previous detection cycle is greater than or equal to a preset threshold, and acquire a first water inlet temperature and a first water outlet temperature of the water-side heat exchanger.

[0080] A second acquisition module is configured to acquire a second water inlet temperature and a second water outlet temperature of the water-side heat exchanger after the water pump operates for a first preset time length.

[0081] A third judgment module is configured to judge whether the second water inlet temperature and the second water outlet temperature satisfy a preset temperature rise condition, and if yes, control the water pump to stop operating after operating for a second preset time length and control the heat pump unit to switch from the freeze-proof mode to the standby mode.

[0082] A fourth judgment module is configured to, after the heat pump unit switches from the freeze-proof mode to the standby mode, judge whether a lowest temperature of a third water inlet temperature and a third water outlet temperature of the water-side heat exchanger in the current standby mode is less than a target initial temperature, and if yes, control the heat pump unit to switch from the standby mode to the freeze-proof mode, where the target initial temperature is a highest temperature of the first water inlet temperature and the first water outlet temperature.

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

[0084] The eighth control module is configured to, after the heat pump unit is switched from the anti-freezing mode to the standby mode, if the lowest temperature of the third inlet water temperature and the third outlet water temperature is not less than the target initial temperature, control the water pump to run for a first time length, and then return to execute the step of judging 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 less than the target initial temperature.

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

[0086] The third determination module is configured to, when the current environment temperature is detected to be lower than the preset environment temperature, in a case where the heat pump unit is in the standby mode, acquire the water flow of the anti-freezing valve based on a preset detection period, and determine a water flow increase value of the current water flow relative to a historical water flow acquired in a previous detection period.

[0087] The seventh determination module is configured to determine whether the water flow increase value is greater than or equal to a preset threshold value, and if yes, determine that the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold value.

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

[0089] The fifth acquisition module is configured to, in a case where the second inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rise condition, acquire a continuous running time length of the water pump.

[0090] The eighth determination module is configured to determine whether the continuous running time length reaches a preset time length threshold value.

[0091] The fourth control module is configured to, in a case where the continuous running time length does not reach the preset time length threshold value, control the water pump to continue running for a first preset time length, and then return to execute the step of judging whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rise condition.

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

[0093] The ninth control module is configured to, in a case where the continuous running time length reaches the preset time length threshold value, control the heat pump unit to start heating operation.

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

[0095] The sixth acquisition module is configured to, in a case where the heat pump unit performs heating operation, acquire a fourth inlet water temperature and a fourth outlet water temperature of the water side heat exchanger.

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

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

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

[0099] In a fifth aspect, an embodiment of the present application provides a heat pump unit, including: a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop including a water-side heat exchanger, the water circulation loop including the water-side heat exchanger, an anti-freezing valve and a water pump, the refrigerant circulation loop and the water circulation loop exchanging heat through the water-side heat exchanger.

[0100] The heat pump unit is used to run according to the control method of the heat pump unit provided in the first aspect or any possible implementation of the first aspect of the present application, or is used to run according to the control method of the heat pump unit provided in the second aspect or any possible implementation of the second aspect of the present application.

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

[0102] The heat pump unit in the embodiment of the present application comprises a refrigerant circulation loop and a water circulation loop, the water side heat exchanger is included in the refrigerant circulation loop, the water side heat exchanger, the freeze-proof valve and the water pump are included in the water circulation loop, the refrigerant circulation loop and the water circulation loop exchange heat through the water side heat exchanger; in the case that 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 freeze-proof valve is lower than the preset frozen water temperature threshold, the heat pump unit is controlled to enter the freeze-proof 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 acquired; after the water pump runs for a first preset time length, the current second water inlet temperature and the second water outlet temperature of the water side heat exchanger are acquired; whether the second water inlet temperature and the second water outlet temperature satisfy the preset temperature rise condition is judged, if yes, the water pump is controlled to be closed after running for a second preset time length, and the heat pump unit is controlled to switch from the freeze-proof mode to the standby mode; after the heat pump unit switches from the freeze-proof mode to the standby mode, 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 is judged, if yes, the heat pump unit is controlled to switch from the standby mode to the freeze-proof mode, wherein the target initial temperature is the highest temperature of the first water inlet temperature and the first water outlet temperature. In this way, by detecting the internal water temperature of the freeze-proof valve and the water inlet and outlet temperatures of the water side heat exchanger, it can be quickly judged whether the system faces the freezing risk, so that the freeze-proof mode is entered in time, and the water side heat exchanger and the water circulation pipeline are protected from freezing damage. Moreover, after entering the freeze-proof mode for the first time, the switching of the subsequent freeze-proof mode can directly enter the freeze-proof mode according to the water temperature of the first time triggering the freeze-proof mode, so that the situation that the freeze-proof valve is drained frequently and the freeze-proof mode is entered frequently is avoided, water resources are effectively saved, the wear of the freeze-proof valve is reduced, the service life thereof is prolonged, and directly entering the freeze-proof mode can more quickly cope with the low-temperature environment, prevent the equipment from being damaged by freezing, and improve the stability and reliability of the operation of the heat pump unit. BRIEF DESCRIPTION OF DRAWINGS

[0103] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only represent some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

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

[0105] Figure 2 A flowchart of a control method of a heat pump unit is provided for an exemplary embodiment of the present application.

[0106] Figure 3A control method for a heat pump unit to enter an anti-freezing mode is provided for an exemplary embodiment of the present application.

[0107] Figure 4 A specific flowchart of a control method for a heat pump unit is provided for an exemplary embodiment of the present application.

[0108] Figure 5 A flowchart of another control method for a heat pump unit is provided for an exemplary embodiment of the present application.

[0109] Figure 6 A structure diagram of a control device for a heat pump unit is provided for an exemplary embodiment of the present application.

[0110] Figure 7 A structure diagram of another control device for a heat pump unit is provided for an exemplary embodiment of the present application.

[0111] Figure 8 A structure diagram of a heat pump unit is provided for an exemplary embodiment of the present application. DETAILED DESCRIPTION

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

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

[0114] Next, please refer to Figure 1 which exemplarily shows a structure diagram of a heat pump unit 100 provided by an embodiment of the present application. As shown in Figure 1 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 phase change and flow of refrigerant; the water circulation loop 120 is mainly used to deliver heat to or absorb heat from the user side end.

[0115] In some embodiments, the above-mentioned refrigerant circulation loop 110 includes, connected in sequence by pipelines, a compressor 111, a four-way valve 112, a finned heat exchanger 113, an electronic expansion valve 114, and a water-side heat exchanger 115, which can be a plate-type water-side heat exchanger. The refrigerant circulation loop can also include a fan 116 installed on the outside of the finned heat exchanger 113. The compressor 111 compresses low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure gas, enabling the refrigerant 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 between cooling and heating modes. In the cooling mode, the high-temperature and high-pressure gas is cooled by the finned heat exchanger 113, which acts as a condenser, to become high-pressure liquid. The electronic expansion valve 114 reduces the pressure of the refrigerant by adjusting the opening degree, so that it enters a low-temperature and low-pressure state, and the low-temperature and low-pressure refrigerant evaporates into a gaseous state after absorbing heat in the water-side heat exchanger 115 in the water circulation loop 120. In the heating mode, the 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 above-mentioned water circulation loop 120 includes, connected in sequence by pipelines, a user-side terminal 121, a water flow sensor 122, an anti-freezing valve 123, an inlet water temperature sensor 124, a water-side heat exchanger 115, an outlet water temperature sensor 125, and a water pump 126. In the water circulation loop 120, the return water from the user-side terminal 121 passes through the water flow sensor 122, the anti-freezing valve 123, and the inlet water temperature sensor 124 into the water-side heat exchanger 115, which exchanges heat between the water and the refrigerant, increasing or decreasing the water temperature. The heat-exchanged outlet water then passes through the outlet water temperature sensor 125 and returns to the user-side terminal 121, transferring cold or heat to the target environment.

[0117] The user-side terminal 121 achieves 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 anti-freezing valve 123 prevents water from freezing in the pipeline in low-temperature environments, protecting the safety of the system. The inlet water temperature sensor 124 is used to detect the water temperature entering the water-side heat exchanger 115, to adjust the operation of the heat pump unit 100 and ensure that the water temperature is within a reasonable range. The water-side heat exchanger 115 exchanges heat between the refrigerant and the water, transferring heat from the refrigerant to the water or absorbing heat from the water into the refrigerant. The outlet water temperature sensor 125 is used to detect the outlet water temperature of the water-side heat exchanger 115 for feedback control, further optimizing the operation process of the heat pump unit 100. The water pump 126 is used to provide circulating power to push water through the entire water circulation loop 120.

[0118] In some embodiments, the processor is configured to perform the following steps: when the heat pump unit 100 is in a standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, and when it is detected that the internal water temperature of the freeze prevention valve 123 is lower than a preset freeze water temperature threshold, the processor controls the heat pump unit 100 to switch from the standby mode to a freeze prevention mode, controls the water pump 126 to start running, and obtains the first inlet water temperature and the first outlet water temperature of the water-side heat exchanger 115; after the water pump 126 runs for a first preset time, the processor obtains the current second inlet water temperature and the second outlet water temperature of the water-side heat exchanger 115; the processor determines whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rise condition, and if yes, the processor controls the water pump 126 to stop running after running for a second preset time, and controls the heat pump unit 100 to switch from the freeze prevention mode to the standby mode; after the heat pump unit 100 switches from the freeze prevention mode to the standby mode, the processor determines 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 a target initial temperature, and if yes, the processor controls the heat pump unit 100 to switch from the standby mode to the freeze prevention mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

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

[0120] S201, when the heat pump unit is in a standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, and when it is detected that the internal water temperature of the freeze prevention valve is lower than a preset freeze water temperature threshold, the processor controls the heat pump unit to switch from the standby mode to a freeze prevention mode, controls the water pump to start running, and obtains the first inlet water temperature and the first outlet water temperature of the water-side heat exchanger.

[0121] In some embodiments, the standby mode means that the heat pump unit is in a non-freeze prevention state, but can start the freeze prevention operation at any time; the freeze prevention mode is an operating mode adopted to prevent water from freezing.

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

[0123] In some embodiments, the anti-freezing valve is used to detect the internal water temperature of the anti-freezing valve, and the anti-freezing valve is controlled to open when the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold, so as to drain water. Specifically, when the internal water temperature of the anti-freezing valve is lower than the start temperature T k , the valve of the anti-freezing valve is automatically opened; when the internal water temperature of the anti-freezing valve is lowered to the preset freezing water temperature threshold T k-n (wherein n>0, and is an integer), the valve of the anti-freezing valve is fully opened, and the process does not require any external force; when the internal water temperature of the anti-freezing valve is higher than the shutdown temperature T i , the valve is automatically closed.

[0124] That is, when it is detected that the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold, it indicates that the valve of the anti-freezing valve has been fully opened, and at this time the heat pump unit can be controlled to enter the anti-freezing mode from the standby mode. The entire heat pump unit can quickly drain the water in the water circulation loop when the temperature is lower than the preset freezing water temperature threshold. The anti-freezing valve automatically controls the opening or closing of the valve according to the water temperature, so that the heat pump unit can still prevent the stored water in the plate water-side heat exchanger from being frozen in the case of power failure, effectively improving the stability and reliability of the heat pump unit operation.

[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 outlet water temperature of the water-side heat exchanger, and the water inlet temperature sensing bag is used to collect the inlet water temperature of the water-side heat exchanger. After the heat pump unit enters the anti-freezing mode, the water pump is started to control the water pump to start running, and the first inlet water temperature of the water-side heat exchanger is collected through the water inlet temperature sensing bag, and the first outlet water temperature of the water-side heat exchanger is collected through the water outlet temperature sensing bag.

[0126] The temperature data is collected through the water inlet temperature sensing bag and the water outlet temperature sensing bag to detect the temperature change of the water flow in the water-side heat exchanger in real time. When the heat pump unit enters the anti-freezing mode, by analyzing the difference between the inlet and outlet water temperatures, it can be detected whether the water temperature is lowered to a critical value that may cause freezing, thereby reducing the probability of damage to the heat pump unit.

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

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

[0129] S203, judging whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rising condition, if yes, controlling the water pump to run for a second preset time length and then to be turned off, and controlling the heat pump unit to switch from the anti-freezing mode to the standby mode.

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

[0131] That is, after the second inlet water temperature and the second outlet water temperature satisfy the temperature rising condition, the water pump needs to continue to run for a second preset time length, and then the water pump is turned off, and then the running state of the heat pump unit is adjusted from the anti-freezing mode to the standby mode.

[0132] S204, after the heat pump unit is switched from the anti-freezing mode to the standby mode, judging 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 less than a target initial temperature, if yes, controlling the heat pump unit to switch from the standby mode to the anti-freezing mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

[0133] In some embodiments, the target initial temperature is a reference temperature for judging whether it is necessary to re-enter the anti-freezing mode, which can be the highest inlet water temperature or outlet water temperature detected when initially entering the anti-freezing mode.

[0134] It can be understood that after the heat pump unit is switched from the anti-freezing mode 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 less than the target initial temperature, it indicates that the water temperature has been reduced to the highest inlet water temperature or outlet water temperature detected when initially entering the anti-freezing mode, and there is a risk of freezing, and therefore the heat pump unit is controlled to re-enter the anti-freezing mode.

[0135] In some embodiments, the target initial temperature is a reference temperature for judging whether it is necessary to re-enter the anti-freezing mode, which can be the highest inlet water temperature or outlet water temperature detected when initially entering the anti-freezing mode.

[0136] In the embodiments of the present application, the heat pump unit includes a refrigerant circulation loop and a water circulation loop, the water side heat exchanger is included in the refrigerant circulation loop, the water side heat exchanger, the freeze-proof valve and the water pump are included in the water circulation loop, the refrigerant circulation loop and the water circulation loop exchange heat through the water side heat exchanger; in the case that 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 freeze-proof valve is lower than the preset frozen water temperature threshold, it is determined that the heat pump unit enters the freeze-proof 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 length, the current second water inlet temperature and the second water outlet temperature of the water side heat exchanger are obtained; it is judged whether the second water inlet temperature and the second water outlet temperature satisfy the preset temperature rising condition, if yes, the water pump is controlled to be closed after running for a second preset time length, and the heat pump unit is switched from the freeze-proof mode to the standby mode; after the heat pump unit is switched from the freeze-proof mode to the standby mode, it is judged 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 yes, the heat pump unit is switched from the standby mode to the freeze-proof mode, wherein the target initial temperature is the highest temperature of the first water inlet temperature and the first water outlet temperature. Thus, by detecting the internal water temperature of the freeze-proof valve and the water inlet and outlet temperatures of the water side heat exchanger, it can be quickly judged whether the system is facing the freezing risk, so as to timely enter the freeze-proof mode, and protect the water side heat exchanger and the water circulation pipeline from freezing damage. Moreover, after entering the freeze-proof mode for the first time, the switching of the subsequent freeze-proof mode can directly enter the freeze-proof mode according to the water temperature of the first time triggering the freeze-proof mode, avoiding the situation that the freeze-proof valve is drained frequently and the freeze-proof mode is entered frequently, effectively saving water resources, reducing the wear of the freeze-proof valve, prolonging the service life, and directly entering the freeze-proof mode can more quickly cope with the low-temperature environment, prevent equipment freezing 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 above heat pump unit is switched from the above freeze-proof mode to the above standby mode, if the lowest temperature of the above third water inlet temperature and the above third water outlet temperature is not less than the above target initial temperature, the above water pump is controlled to run for a first time length, and then the step of judging 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 is executed.

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

[0140] The embodiment of the application can save energy while improving the safety of the heat pump unit in a low-temperature environment, reducing the probability of equipment damage or performance decline caused by water freezing, and effectively improving the stability and reliability of the heat pump unit operation.

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

[0142] S211, in the case that the second inlet water temperature and the second outlet water temperature do not meet the preset temperature rise condition, the continuous running time of the water pump is obtained.

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

[0144] S212, whether the continuous running time reaches a preset time threshold is judged.

[0145] The preset time threshold can be the longest time of the continuous running of the water pump, and if the temperature rise condition is not reached after exceeding the time, other measures can be taken.

[0146] In some embodiments, the preset time threshold can be greater than the first preset time. For example, the continuous running time can be twice the first preset time.

[0147] S213, in the case that the continuous running time does not reach the preset time threshold, the water pump is controlled to continue running for the first preset time, and then the step of judging whether the second inlet water temperature and the second outlet water temperature meet the preset temperature rise condition is returned to execute.

[0148] That is, in the case that the continuous running time of the water pump does not reach the upper limit (the preset time threshold), the water pump is controlled to run for a period of time again, and the new second inlet water temperature and the second outlet water temperature are collected for the next round of judgment, until the continuous running time reaches the preset time threshold, S214 is executed.

[0149] S214, in the case that the continuous running time reaches the preset time threshold, the heat pump unit is controlled to start heating operation.

[0150] The control of the heat pump unit to start heating operation means to start the heating function of the heat pump, and actively raise the water temperature. When the continuous running 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, so as to improve the safety of the heat pump unit.

[0151] In the embodiments 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 trying to prevent freezing in a low energy consumption mode (only running the water pump); if the expected effect is not achieved, measures to start heating are taken to prevent freezing, thereby intelligently switching between circulating water and active heating to achieve better anti-freezing effect, increase energy utilization efficiency, and prevent the water pump from running continuously for a long time, avoid excessive wear of equipment, and prolong the service life of the equipment.

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

[0153] S215, when the heat pump unit is in the standby mode, if it is detected that the current environment temperature is lower than the preset environment temperature, the water flow of the anti-freezing valve is obtained based on a preset detection period, and the water flow increase value of the current water flow obtained relative to the historical water flow obtained in the last detection period is determined.

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

[0155] The water flow through the anti-freezing valve can be detected in real time by the water flow sensor, and the water flow data collected in real time can accurately reflect the working state of the anti-freezing valve, thereby 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, if yes, determining that the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold value.

[0157] Specifically, when it is detected that the current environment temperature is lower than the preset environment temperature, the initial water flow Q1 of the anti-freezing valve is collected, and then after the current water flow Q2 is collected in the next detection period, the difference between the current water flow Q2 and the initial water flow (i.e. historical water flow) Q1 collected in the last detection period is calculated as the water flow increase value AQ = Q2-Q1 of the current water flow relative to the historical water flow obtained in the last detection period. Further determine whether the water flow increase value AQ is greater than or equal to a preset threshold value, wherein the preset threshold value can be the water flow value flowing through the cold valve in a unit period when the cold valve is fully opened.

[0158] If the water flow increase value ΔQ is greater than or equal to the preset threshold value, it indicates that the freeze-proof valve has been fully opened, that is, the internal water temperature of the freeze-proof valve is lower than the preset freezing water temperature threshold. If the water flow increase value ΔQ is less than the preset threshold value, it indicates that the freeze-proof valve is not fully opened, and then the next detection period can be entered, and the water flow Q3 of the next detection period is continuously collected, and the current water flow Q2 collected in the current detection period is taken as the new historical water flow, and so on.

[0159] Figure 3 A flowchart of a control method for a heat pump unit entering an anti-freezing mode is provided for an exemplary embodiment of the present application, as shown in Figure 3 The control method for the heat pump unit entering the anti-freezing mode includes the following S301-S306:

[0160] S301, in the case that the heat pump unit is in a standby mode, it is detected that the current environment temperature is lower than a preset environment temperature.

[0161] S302, the water flow of the freeze-proof valve is acquired based on a preset detection period.

[0162] S303, the water flow increase value of the current water flow acquired with respect to the historical water flow acquired in the last detection period is determined.

[0163] S304, it is judged whether the water flow increase value is greater than or equal to a preset threshold value, if yes, S305 is executed, if not, S302 is returned to be executed.

[0164] S305, it is determined that the internal water temperature of the freeze-proof valve is lower than a preset freezing water temperature threshold.

[0165] S306, the heat pump unit is controlled to enter the anti-freezing mode from the standby mode.

[0166] In the embodiment of the present application, by detecting the water flow change of the freeze-proof valve in the standby mode, the opening degree of the freeze-proof valve can be more effectively judged, thereby indirectly acquiring the water temperature condition in the freeze-proof valve, improving the response ability of the heat pump unit to the low temperature environment, reducing the energy consumption and equipment loss, and improving the safety and reliability of the heat pump unit. At the same time, the 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, in the case that the heat pump unit is in a heating operation, the fourth inlet water temperature and the fourth outlet water temperature of the water-side heat exchanger are acquired.

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

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

[0171] In some embodiments, when the heat pump unit is in the heating operation, 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, it is determined whether the heat pump unit has reached the required heating effect by the fourth water inlet temperature and the fourth water outlet temperature, i.e., whether the fourth water inlet temperature and the fourth water outlet temperature both reach the preset shutdown temperature threshold. If the fourth water inlet temperature and / or the fourth water outlet temperature is 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 obtained based on the preset period; if the fourth water inlet temperature and the fourth water outlet temperature are both not less than the preset shutdown temperature threshold, it indicates that the water temperature is high enough and the heating requirement is met. At this time, the heat pump stops running to save energy and prevent over-heating, effectively reducing energy consumption.

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

[0173] S231, after the heat pump unit stops running, if it is detected that the water pump running time reaches the third preset time length, controlling the water pump to stop running and controlling the heat pump unit to switch from the anti-freezing mode to the standby mode.

[0174] The water pump running time can be the cumulative running time of the water pump after the heat pump unit stops the heating operation; and the third preset time length can be the maximum running time of the water pump when the heat pump unit is in the heating operation.

[0175] In some embodiments, if the water pump running time reaches the third preset time length, it can be considered that the water flow circulation is sufficient, and then 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-freezing mode to the standby mode means that after the risk of anti-freezing has passed, the heat pump unit no longer needs to continue running at full capacity, and can be switched to the standby mode with low power consumption.

[0177] In the embodiments of the present application, by setting the maximum running time (the third preset time length) of the water pump, the water pump is stopped when it is not necessary to continue running, preventing over-running and effectively saving energy.

[0178] In some embodiments, the user-side terminal comprises a display; the user-side terminal is configured to acquire the operating parameters of the heat pump unit, and display the operating parameters on the display, wherein the operating parameters comprise at least one of the following: the water inlet temperature of the water-side heat exchanger, the water outlet temperature, the water flow of the freeze-proof valve, etc.

[0179] In the embodiments of the present application, the user-side terminal can display the operating parameters in the operation process of the heat pump unit in real time, so that the user can view the operating parameters in real time. If an abnormality occurs, the user can find and troubleshoot or adjust in time, so as to avoid equipment damage or efficiency reduction caused by problem accumulation.

[0180] The following will be described in detail Figure 4 The control method of the heat pump unit provided in the present application will be further described, for example, Figure 4 The specific process of the control method of the heat pump unit comprises the following S401-S415:

[0181] S401, in the case that the heat pump unit is in standby mode and the current ambient temperature is lower than the preset ambient temperature threshold, detecting that the internal water temperature of the freeze-proof valve is lower than the preset frozen water temperature threshold.

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

[0183] S403, after the water pump operates for a first preset time length, acquiring the current second water inlet temperature and the second water outlet temperature of the water-side heat exchanger.

[0184] S404, judging whether the second water inlet temperature and the second water outlet temperature satisfy the preset temperature rising condition, if yes, executing S405, and if no, executing S408.

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

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

[0187] S407, judging whether the lowest temperature of the third water inlet temperature and the third water outlet temperature is less than the target initial temperature, if yes, returning to execute S402, and if no, returning to execute S405.

[0188] Optionally, the steps of S401-S407 are consistent with the steps of S201-S204, which will not be described herein.

[0189] S408, acquiring the continuous operating time length of the water pump.

[0190] S409, determine whether the continuous running duration reaches a preset duration threshold, if yes, execute S410, if not, return to execute S403.

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

[0192] Optionally, the steps of S408-S410 are consistent with S211-S214, which will not be repeated here.

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

[0194] S412, detect whether the fourth inlet water temperature and the fourth outlet water temperature are both not less than a preset shutdown temperature threshold, if yes, execute S413, if not, return to execute S411.

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

[0196] Optionally, the steps of S411-S413 are consistent with S221-S222, which will not be repeated here.

[0197] S414, detect that the water pump running duration reaches a third preset duration.

[0198] S415, control the water pump to stop operation, and control the heat pump unit to switch from the anti-freezing mode to the standby mode.

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

[0200] The embodiments of the present application realize the anti-freezing protection of the heat pump unit in an automatic manner, and intelligently adjust the operation mode according to temperature changes and water pump running duration, thereby improving the operation efficiency and safety of the heat pump unit. The heat pump unit can prevent freezing in low temperature environment, and through precise control of the water pump running duration and energy consumption, the goals of energy saving and prolonging equipment life are realized. The automatic and intelligent control mode not only reduces human intervention, improves user experience, but also enhances the stability and reliability of the heat pump unit.

[0201] Another heat pump unit control method is also provided in an example embodiment of the present application. The heat pump unit control method can be applied to the above processor. For details, please refer to Figure 5, which exemplarily shows a flowchart of another control method of a heat pump unit provided by the embodiments of the present application. The heat pump unit comprises a refrigerant circulation loop and a water circulation loop. The water-side heat exchanger is included in the refrigerant circulation loop. The water-side heat exchanger, an anti-freezing valve, a water flow sensor and a water pump are included in the water circulation loop. The water flow sensor is configured to collect the water flow of the anti-freezing valve. The refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger. As shown in Figure 5 The control method of the heat pump unit comprises the following S501-S504.

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

[0203] Optionally, the water flow of the anti-freezing valve can be collected by a water flow sensor. The water flow sensor is connected to the anti-freezing valve, and the water flow sensor is configured to collect the water flow of the anti-freezing valve.

[0204] In some embodiments, when the heat pump unit is in the standby mode, the water flow of the anti-freezing valve can be obtained based on a preset detection cycle when it is detected that the current ambient temperature is lower than the preset ambient temperature, and the water flow increase value of the current water flow of the anti-freezing valve relative to the historical water flow of the last detection cycle is 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 through the anti-freezing valve can be detected in real time by the water flow sensor, and the water flow data collected in real time can accurately reflect the working state of the anti-freezing valve, thereby effectively improving the reliability of the operation of the heat pump unit.

[0206] S502, after the water pump runs for a first preset time length, the second inlet water temperature and the second outlet water temperature of the water-side heat exchanger are obtained.

[0207] Specifically, the steps of S502 are consistent with those of S202, which will not be described here.

[0208] S503, it is determined whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rise condition. If yes, the water pump is controlled to be turned off after running for a second preset time length, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode.

[0209] Specifically, the step of S503 is consistent with the step of S203, which will not be repeated here.

[0210] S504, after the heat pump unit is switched from the anti-freezing mode to the standby mode, it is judged 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 less than the target initial temperature, if yes, the heat pump unit is controlled to be switched from the standby mode to the anti-freezing mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

[0211] Specifically, the step of S504 is consistent with the step of S204, which will not be repeated here.

[0212] In the embodiment of the present application, the heat pump unit includes a refrigerant circulation loop and a water circulation loop, the water side heat exchanger is included in the refrigerant circulation loop, the water side heat exchanger, the anti-freezing valve and the water pump are included in the water circulation loop, and the refrigerant circulation loop and the water circulation loop exchange heat through the water side heat exchanger; in the case that the heat pump unit is in the standby mode and the current environment temperature is lower than the preset environment temperature threshold, when it is detected that the water flow increase value of the current water flow of the anti-freezing valve relative to the historical water flow of the last detection cycle is greater than or equal to the preset threshold, the heat pump unit is controlled to enter the anti-freezing mode from the standby mode, the water pump is controlled to start running, and the first inlet water temperature and the first outlet water temperature of the water side heat exchanger are obtained; after the water pump runs for a first preset time length, the current second inlet water temperature and the second outlet water temperature of the water side heat exchanger are obtained; it is judged whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rise condition, if yes, the water pump is controlled to be closed after running for a second preset time length, and the heat pump unit is controlled to be switched 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 judged 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 less than the target initial temperature, if yes, the heat pump unit is controlled to be switched from the standby mode to the anti-freezing mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature. Therefore, by detecting the water flow increase value of the current water flow of the anti-freezing valve relative to the historical water flow of the last detection cycle, it can be quickly judged whether the system is facing the freezing risk, so as to enter the anti-freezing mode in time, and protect the water side heat exchanger and the water circulation pipeline from freezing damage. Moreover, after entering the anti-freezing mode for the first time, the switching of the subsequent anti-freezing mode can directly enter the anti-freezing mode according to the water temperature of the first time triggering the anti-freezing mode, avoiding the situation that the anti-freezing valve drains water frequently and enters the anti-freezing mode frequently, effectively saving water resources, reducing the wear of the anti-freezing valve, prolonging the service life, and directly entering the anti-freezing mode can more quickly cope with the low temperature environment, prevent the equipment from freezing damage, and improve the stability and reliability of the operation of the heat pump unit.

[0213] Reference will now be made to Figure 6 Fig. 1 is a structural schematic diagram of a control device of a heat pump unit according to an example embodiment of the present application, the heat pump unit comprising a refrigerant circulation loop and a water circulation loop, the refrigerant circulation loop comprising a water-side heat exchanger, the water circulation loop comprising the water-side heat exchanger, a freeze-proof valve and a water pump, the refrigerant circulation loop and the water circulation loop exchanging heat through the water-side heat exchanger. As shown in Figure 6 The control device 600 of the heat pump unit comprises:

[0214] A first control module 601 is configured to, when the heat pump unit is in a standby mode and the current ambient temperature is lower than a preset ambient temperature threshold, control the heat pump unit to switch from the standby mode to a freeze-proof mode and control the water pump to start running when it is detected that the internal water temperature of the freeze-proof valve is lower than a preset freeze water temperature threshold, and acquire a first inlet water temperature and a first outlet water temperature of the water-side heat exchanger.

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

[0216] A first judgment module 603 is configured to judge whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rise condition, and if so, control the water pump to stop running after running for a second preset time length and control the heat pump unit to switch from the freeze-proof mode to the standby mode.

[0217] A second judgment module 604 is configured to, after the heat pump unit switches from the freeze-proof mode to the standby mode, judge whether the lowest temperature of a third inlet water temperature and a third outlet water temperature of the water-side heat exchanger in the current standby mode is less than a target initial temperature, and if so, control the heat pump unit to switch from the standby mode to the freeze-proof 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 device 600 further comprises:

[0219] A third control module is configured to, after the heat pump unit switches from the freeze-proof mode to the standby mode, if the lowest temperature of the third inlet water temperature and the third outlet water temperature is not less than the target initial temperature, control the water pump to run for a first time length and then return to the step of judging 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 less than the target initial temperature.

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

[0221] The first determining module is configured to, when the heat pump unit is in the standby mode, and when it is detected that the current environment temperature is lower than the preset environment temperature, acquire the water flow of the freeze-proof valve based on a preset detection period, and determine a water flow increase value of the current water flow acquired relative to a historical water flow acquired in a previous detection period.

[0222] The fifth determining module is configured to determine whether the water flow increase value is greater than or equal to a preset threshold value, and if so, determine that the internal water temperature of the freeze-proof valve is lower than the preset freezing water temperature threshold value.

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

[0224] The third acquiring module is configured to, when the second inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rise condition, acquire a continuous running duration of the water pump.

[0225] The sixth determining module is configured to determine whether the continuous running duration reaches a preset duration threshold value.

[0226] The fourth controlling module is configured to, when the continuous running duration does not reach the preset duration threshold value, control the water pump to continue running for a first preset duration, and then return to execute the step of determining whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rise condition.

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

[0228] The fifth controlling module is configured to, when the continuous running duration reaches the preset duration threshold value, control the heat pump unit to start heating operation.

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

[0230] The fourth acquiring module is configured to, when the heat pump unit is in heating operation, acquire a fourth inlet water temperature and a fourth outlet water temperature of the water-side heat exchanger.

[0231] The sixth controlling module is configured to, when it is detected that the fourth inlet water temperature and the fourth outlet water temperature are both greater than or equal to a preset shutdown temperature threshold value, control the heat pump unit to stop running.

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

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

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

[0235] In a possible implementation, the water outlet of the water-side heat exchanger is provided with a water outlet temperature sensing bulb, and the water inlet of the water-side heat exchanger is provided with a water inlet temperature sensing bulb, the water outlet temperature sensing bulb is configured to collect the outlet water temperature of the water-side heat exchanger, and the water inlet temperature sensing bulb is configured 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, the water flow sensor is connected to the anti-freezing valve, and the water flow sensor is configured to collect the water flow of the anti-freezing 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 configured to obtain the running parameters of the heat pump unit, and display the running parameters on the display.

[0239] The division of the modules in the control device 600 of the heat pump unit is only for illustration, and 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 embodiments of the present application can be in the form of a computer program. The computer program can run on a terminal or a server. The program modules constituted by the computer program can be stored on 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 embodiments of the present application are implemented.

[0240] Next, please refer to Figure 7 which is a structural schematic diagram of another control device of a heat pump unit provided by an example embodiment of the present application. The heat pump unit includes a refrigerant circulation loop and a water circulation loop. The water-side heat exchanger is included in the refrigerant circulation loop. The water-side heat exchanger, an anti-freezing valve, and a water pump are included in the water circulation loop. The refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger. As shown in Figure 7 , the control device 700 of the heat pump unit includes:

[0241] The second control module 701 is configured to, in the case that the heat pump unit is in the standby mode and the current ambient temperature is lower than the preset ambient temperature threshold, control the heat pump unit to enter the anti-freezing mode from the standby mode and control the water pump to start running when it is detected that the water flow increase value of the current water flow of the anti-freezing valve relative to the historical water flow of the last detection cycle is greater than or equal to a preset threshold, and acquire the first inlet water temperature and the first outlet water temperature of the water-side heat exchanger.

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

[0243] The third judgment module 703 is configured to judge whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rise condition, and if yes, control the water pump to run for a second preset time length and then be turned off, and control the heat pump unit to switch from the anti-freezing mode to the standby mode.

[0244] The fourth judgment module 704 is configured to, after the heat pump unit switches from the anti-freezing mode to the standby mode, 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 less than a target initial temperature, and if yes, control the heat pump unit to switch from the standby mode to the anti-freezing mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature.

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

[0246] The eighth control module is configured to, after the heat pump unit switches from the anti-freezing mode to the standby mode, if the lowest temperature of the third inlet water temperature and the third outlet water temperature is not less than the target initial temperature, control the water pump to run for a first time length, and then return to execute the step of judging 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 less than the target initial temperature.

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

[0248] The third determination module is configured to, in the case that the heat pump unit is in the standby mode, acquire the water flow of the anti-freezing valve based on a preset detection cycle when it is detected that the current ambient temperature is lower than the preset ambient temperature, and determine a water flow increase value of the current water flow relative to the historical water flow of the last detection cycle.

[0249] The seventh judging module is configured to judge whether the water flow increase value is greater than or equal to a preset threshold value, and if yes, determine that the internal water temperature of the freeze-proof valve is lower than the preset freezing water temperature threshold value.

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

[0251] The fifth obtaining module is configured to, in a case where the second inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rise condition, obtain a duration of continuous operation of the water pump.

[0252] The eighth judging module is configured to judge whether the duration of continuous operation reaches a preset duration threshold value.

[0253] The fourth control module is configured to, in a case where the duration of continuous operation does not reach the preset duration threshold value, control the water pump to continue to operate for a first preset duration, and then return to execute the step of judging whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rise condition.

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

[0255] The ninth control module is configured to, in a case where the duration of continuous operation reaches the preset duration threshold value, control the heat pump unit to start heating operation.

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

[0257] The sixth obtaining module is configured to, in a case where the heat pump unit performs heating operation, obtain a fourth inlet water temperature and a fourth outlet water temperature of the water-side heat exchanger.

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

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

[0260] The eleventh control module is configured to, after the heat pump unit stops operation, if it is detected that the duration of operation of the water pump reaches a third preset duration, control the water pump to stop operation, and control the heat pump unit to switch from the freeze-proof mode to the standby mode.

[0261] Next, please refer to Figure 8 which is a structural schematic diagram of a heat pump unit provided by an example embodiment of the present application. As shown in Figure 8As shown, the heat pump unit 800 can include a refrigerant circulation loop including a water-side heat exchanger, and a water circulation loop including the water-side heat exchanger, an anti-freezing valve and a water pump, the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger; and can further include a processor 810 and a memory 820, a user interface 830, a network interface 840 and a communication bus 850.

[0262] The processor 810 can include one or more processing cores. The processor 810 connects various parts in the heat pump unit 800 through various interfaces and lines, and performs various functions of the heat pump unit 800 and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory 820, and calling data stored in the memory 820. Alternatively, the processor 810 can be implemented in at least one of a hardware form of a digital signal processing (DSP), a field-programmable gate array (FPGA), and a programmable logic array (PLA). The processor 810 can be integrated with a combination of one or more of a central processing unit (CPU), a graphics processing unit (GPU) and a modem. Among them, the CPU mainly processes operating systems 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 for processing wireless communication. It can be understood that the above-mentioned modem can also not be integrated into the processor 810, but can be realized by a separate chip.

[0263] The memory 820 can include a random access memory (RAM) and a read-only memory (ROM). Alternatively, the memory 820 includes a non-transitory computer-readable storage medium. The memory 820 can be used to store instructions, programs, codes, code sets or instruction sets. The memory 820 can include a program storage area and a data storage area, wherein the program storage area can 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 various method embodiments, etc.; the data storage area can store data involved in the above-mentioned various method embodiments, etc. The memory 820 can alternatively be at least one storage device located away from the aforementioned processor 810. For example, the memory 820 can be a local memory of the processor 810, or a memory of a server connected to the processor 810 through a network.Figure 8 As shown, the memory 820 as a computer storage medium can include an operating system, a network communication module, a user interface module, and program instructions.

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

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

[0266] In the case that the above heat pump unit is in standby mode and the current environment temperature is lower than the preset environment temperature threshold, when it is detected that the internal water temperature of the above anti-freezing valve is lower than the preset freezing water temperature threshold, the above heat pump unit is controlled to enter the anti-freezing 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 above water pump runs for a first preset time length, the current second water inlet temperature and the second water outlet temperature of the water side heat exchanger are obtained.

[0268] It is judged whether the second water inlet temperature and the second water outlet temperature satisfy a preset temperature rising condition, if yes, the water pump is controlled to be closed after running for a second preset time length, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode.

[0269] After the above heat pump unit switches from the anti-freezing mode to the standby mode, it is judged 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 a target initial temperature, if yes, 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.

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

[0271] After the above heat pump unit switches from the anti-freezing mode to the standby mode, if the lowest temperature of 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 time length, and then the step of judging 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 is executed.

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

[0273] In a case where 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 anti-freezing valve is obtained based on a preset detection period, and a water flow increase value of the current water flow obtained relative to a historical water flow obtained in a previous detection period is determined.

[0274] It is determined whether the water flow increase value is greater than or equal to a preset threshold value, and if yes, it is determined that the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold value.

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

[0276] In a case where the second inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rise condition, a continuous running duration of the water pump is obtained.

[0277] It is determined whether the continuous running duration reaches a preset duration threshold value.

[0278] In a case where the continuous running duration does not reach the preset duration threshold value, after the water pump is controlled to continue running for a first preset duration, the step of determining whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rise condition is performed.

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

[0280] In a case where the continuous running duration reaches the preset duration threshold value, the heat pump unit is controlled to start heating operation.

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

[0282] In a case where the heat pump unit performs heating operation, a fourth inlet water temperature and a fourth outlet water temperature of the water-side heat exchanger are obtained.

[0283] When it is detected that the fourth inlet water temperature and the fourth outlet water temperature are both greater than or equal to a preset shutdown temperature threshold value, 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 running duration of the water pump reaches a third preset duration, 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 anti-freezing valve is configured to detect the internal water temperature of the anti-freezing valve, and control the anti-freezing valve to open to drain water when the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold.

[0287] In a possible implementation, the water outlet of the water-side heat exchanger is provided with a water outlet temperature sensing bulb, and the water inlet of the water-side heat exchanger is provided with a water inlet temperature sensing bulb, the water outlet temperature sensing bulb is configured to collect the outlet water temperature of the water-side heat exchanger, and the water inlet temperature sensing bulb is configured 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, the water flow sensor is connected to the anti-freezing valve, and the water flow sensor is configured to collect the water flow of the anti-freezing 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 configured to obtain the operating parameters of the heat pump unit, and display the operating parameters on the display.

[0291] In a possible implementation, the heat pump unit further includes a user-side terminal, and the user-side terminal includes a display. Figure 8 In the heat pump unit 800 shown in FIG. 8, the processor 810 can further be configured to invoke program instructions stored in the memory 820, and specifically perform the following operations:

[0292] In a possible implementation, the heat pump unit further includes a user-side terminal, and the user-side terminal includes a display.

[0293] In a possible implementation, the heat pump unit further includes a user-side terminal, and the user-side terminal includes a display.

[0294] In a possible implementation, the heat pump unit further includes a user-side terminal, and the user-side terminal includes a display.

[0295] 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 inlet water temperature and the third outlet water temperature of the water side heat exchanger in the current standby mode is less than a target initial temperature, and if so, the heat pump unit is switched from the standby mode to the anti-freezing 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 is switched from the anti-freezing mode to the standby mode, if the lowest temperature of the third inlet water temperature and the third outlet water temperature is not less than the target initial temperature, the water pump is controlled to run for a first time length, and then the step of determining 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 less than the target initial temperature is executed.

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

[0299] When it is detected that the current environment temperature is lower than the preset environment temperature, the water flow of the anti-freezing valve is obtained based on a preset detection period, and a water flow increase value of the current water flow of the anti-freezing valve relative to a historical water flow of a previous detection period is determined.

[0300] It is determined 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 inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rise condition, a continuous running time length of the water pump is obtained.

[0303] It is determined whether the continuous running time length reaches a preset time length threshold.

[0304] When the continuous running time length does not reach the preset time length threshold, the water pump is controlled to continue running for a first preset time length, and then the step of determining whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rise condition is executed.

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

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

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

[0308] In a case where the heat pump unit is in the heating operation, a fourth inlet water temperature and a fourth outlet water temperature of the water-side heat exchanger are obtained.

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

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

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

[0312] The embodiments of the present application further provide 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 embodiments. When the constituent modules of the control device of the heat pump unit are realized in the form of software function units and sold or used as independent products, the constituent modules can be stored in the computer readable storage medium.

[0313] In the above embodiments, all or part of the methods can be implemented by software, hardware, firmware, or any combination thereof. When implemented by software, all or part of the methods can be implemented in the form of a computer program product. The above computer program product includes one or more computer instructions. When the above computer program instructions are loaded and executed on a computer, all or part of the processes or functions described above according to the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted by the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center through a wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes one or more available media sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a digital versatile disc (DVD)), or a semiconductor medium (for example, a solid state disk (SSD)), etc.

[0314] Those of ordinary skill in the art understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing relevant hardware, which can be stored in a computer-readable storage medium. The program can include the processes of the above embodiments when executed. The storage medium includes ROM, RAM, magnetic or optical disks, and other program code storage media. In the absence of conflicts, the technical features in the embodiments and implementations can be combined arbitrarily.

[0315] The above embodiments are merely described as the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements of the technical solutions of the present application made by those of ordinary skill in the art should fall within the protection scope of the claims of the present application.

Claims

1. A control method of a heat pump unit, characterized by, 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 anti-freezing valve and a water pump, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger; the control method comprises: In the case that the heat pump unit is in a 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 anti-freezing valve is lower than a preset freezing water temperature threshold, the heat pump unit is controlled to enter an anti-freezing mode from the standby mode, the water pump is controlled to start running, and the first inlet water temperature and the first outlet water temperature of the water-side heat exchanger are acquired; After the water pump runs for a first preset time length, the current second inlet water temperature and the second outlet water temperature of the water-side heat exchanger are acquired; It is judged whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rising condition, if yes, the water pump is controlled to run for a second preset time length and then be turned off, and the heat pump unit is controlled to switch from the anti-freezing mode to the standby mode; After the heat pump unit switches from the anti-freezing mode to the standby mode, it is judged 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 a target initial temperature, if yes, 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 inlet water temperature and the first outlet water temperature; The method further comprises: In the case that 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 anti-freezing valve is acquired based on a preset detection period, and a water flow increase value of the current water flow relative to a historical water flow acquired in a last detection period is determined; It is judged whether the water flow increase value is greater than or equal to a preset threshold, if yes, it is determined that the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold.

2. The method of claim 1, wherein, The method further comprises: After the heat pump unit switches from the anti-freezing mode to the standby mode, if the lowest temperature of the third inlet water temperature and the third outlet water temperature is not lower than the target initial temperature, the water pump is controlled to run for a first time length, and then the step of judging 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 is executed.

3. The method of claim 1, wherein, The method further comprises: In the case that the second inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rising condition, a continuous running time length of the water pump is acquired; It is judged whether the continuous running time length reaches a preset time length threshold; In the case that the continuous running time length does not reach the preset time length threshold, the water pump is controlled to continue running for a first preset time length, and then the step of judging whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rising condition is executed.

4. The method of claim 3, wherein, The method further comprises: In a case where the continuous running duration reaches the preset duration threshold, the heat pump unit is controlled to start heating operation.

5. The method of claim 4, wherein, The method further comprises: In a case where the heat pump unit is in heating operation, a fourth inlet water temperature and a fourth outlet water temperature of the water-side heat exchanger are obtained; When it is detected that the fourth inlet water temperature and the fourth outlet water temperature are both not less than a preset shutdown temperature threshold, the heat pump unit is controlled to stop running.

6. The method of claim 4, wherein, The method further comprises: After the heat pump unit stops running, if it is detected that the water pump running duration reaches a third preset duration, 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.

7. The method of claim 1, wherein, The anti-freezing valve is used to detect the internal water temperature of the anti-freezing valve, and to control the anti-freezing valve to open to drain water when the internal water temperature of the anti-freezing valve is lower than the preset freezing water temperature threshold.

8. The method of claim 1, wherein, An outlet water temperature of the water-side heat exchanger is collected by an outlet water temperature sensing bulb, and an inlet water temperature of the water-side heat exchanger is collected by an inlet water temperature sensing bulb.

9. The method of claim 1, wherein, The heat pump unit further comprises a water flow sensor connected to the anti-freezing valve, and the water flow sensor is used to collect the water flow of the anti-freezing valve.

10. The method of claim 1, wherein, The heat pump unit further comprises a user-side terminal, and the user-side terminal comprises a display. The user-side terminal is used to obtain the running parameters of the heat pump unit, and to display the running parameters on the display.

11. A control method of a heat pump unit, characterized by, The heat pump unit comprises a refrigerant circulation loop and a water circulation loop, the water-side heat exchanger is included in the refrigerant circulation loop, the water-side heat exchanger, an anti-freezing valve, a water flow sensor and a water pump are included in the water circulation loop, the water flow sensor is used to collect the water flow of the anti-freezing valve, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger; the control method comprises: In a case where 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 anti-freezing valve relative to the historical water flow of the last detection cycle is greater than or equal to a preset threshold, the heat pump unit is controlled to switch from the standby mode to the anti-freezing mode, the water pump is controlled to start running, and a first inlet water temperature and a first outlet water temperature of the water-side heat exchanger are obtained; After the water pump runs for a first preset duration, a second inlet water temperature and a second outlet water temperature of the water-side heat exchanger are obtained; It is determined whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rise condition, and if yes, the water pump is controlled to stop running after running for a second preset duration, 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 inlet water temperature and the third outlet water temperature of the water side heat exchanger in the current standby mode is less than a target initial temperature, and if so, the heat pump unit is switched from the standby mode to the anti-freezing mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature; The method further comprises: After the heat pump unit is switched from the anti-freezing mode to the standby mode, if the lowest temperature of the third inlet water temperature and the third outlet water temperature is not less than the target initial temperature, the water pump is controlled to operate for a first time length, and then the step of determining 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 less than a target initial temperature is executed again; In the case where the second inlet water temperature and the second outlet water temperature do not satisfy the preset temperature rise condition, the continuous operation time length of the water pump is obtained, it is determined whether the continuous operation time length reaches a preset time length threshold, and in the case where the continuous operation time length does not reach the preset time length threshold, the water pump is controlled to continue operating for a first preset time length, and then the step of determining whether the second inlet water temperature and the second outlet water temperature satisfy the preset temperature rise condition is executed again.

12. The method of claim 11, wherein, The method further comprises: In the case where the heat pump unit is in the standby mode, when it is detected that the current environment temperature is lower than the preset environment temperature, the water flow of the anti-freezing valve is obtained based on a preset detection period, and a water flow increase value of the current water flow of the anti-freezing valve relative to the historical water flow of the last detection period is determined. It is determined whether the water flow increase value is greater than or equal to the preset threshold.

13. The method of claim 11, wherein, The method further comprises: In the case where the continuous operation time length reaches the preset time length threshold, the heat pump unit is controlled to start heating operation.

14. The method of claim 13, wherein, The method further comprises: In the case where the heat pump unit performs heating operation, the fourth inlet water temperature and the fourth outlet water temperature of the water side heat exchanger are obtained. When it is detected that the fourth inlet water temperature and the fourth outlet water temperature are both not less than a preset shutdown temperature threshold, the heat pump unit is controlled to stop operating.

15. The method of claim 13, wherein, The method further comprises: After the heat pump unit stops operating, if it is detected that the operation time length of the water pump reaches a third preset time length, the water pump is controlled to stop operating, and the heat pump unit is switched from the anti-freezing mode to the standby mode.

16. A control device for a heat pump unit, characterized by The heat pump unit comprises a refrigerant circulation loop and a water circulation loop, the water side heat exchanger is included in the refrigerant circulation loop, the water side heat exchanger, an anti-freezing valve and a water pump are included in the water circulation loop, and the refrigerant circulation loop and the water circulation loop exchange heat through the water side heat exchanger; the control device comprises: The first control module is configured to, when the heat pump unit is in a standby mode and a current ambient temperature is lower than a preset ambient temperature threshold, control the heat pump unit to enter an anti-freezing mode from the standby mode and control the water pump to start running when it is detected that an internal water temperature of the anti-freezing valve is lower than a preset freezing water temperature threshold, and acquire a first inlet water temperature and a first outlet water temperature of the water-side heat exchanger. The first acquisition module is configured to acquire a current second inlet water temperature and a second outlet water temperature of the water-side heat exchanger after the water pump runs for a first preset time length. The first judgment module is configured to judge whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rising condition, and if yes, control the water pump to be closed after running for a second preset time length and control the heat pump unit to switch from the anti-freezing mode to the standby mode. The second judgment module is configured to judge whether a lowest temperature of a third inlet water temperature and a third outlet water temperature of the water-side heat exchanger in the current standby mode is lower than a target initial temperature after the heat pump unit switches from the anti-freezing mode to the standby mode, and if yes, control the heat pump unit to switch from the standby mode to the anti-freezing mode, wherein the target initial temperature is a highest temperature of the first inlet water temperature and the first outlet water temperature. The control device of the heat pump unit is configured to execute the control method of the heat pump unit according to any one of claims 1-10.

17. A control device for a heat pump unit, characterized by The heat pump unit comprises a refrigerant circulation loop and a water circulation loop, the water-side heat exchanger is included in the refrigerant circulation loop, the water-side heat exchanger, an anti-freezing valve, a water flow sensor and a water pump are included in the water circulation loop, the water flow sensor is configured to collect a water flow of the anti-freezing valve, the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger; the control device comprises: The second control module is configured to, when the heat pump unit is in a standby mode and a current ambient temperature is lower than a preset ambient temperature threshold, control the heat pump unit to enter an anti-freezing mode from the standby mode and control the water pump to start running when it is detected that a water flow increase value of a current water flow of the anti-freezing valve relative to a historical water flow of a last detection cycle is greater than or equal to a preset threshold, and acquire a first inlet water temperature and a first outlet water temperature of the water-side heat exchanger. The second acquisition module is configured to acquire a current second inlet water temperature and a second outlet water temperature of the water-side heat exchanger after the water pump runs for a first preset time length. The third judgment module is configured to judge whether the second inlet water temperature and the second outlet water temperature satisfy a preset temperature rising condition, and if yes, control the water pump to be closed after running for a second preset time length and control the heat pump unit to switch from the anti-freezing mode to the standby mode. A fourth judging module is configured to judge whether the lowest temperature of a third inlet water temperature and a third outlet water temperature of the water-side heat exchanger in the current standby mode is less than a target initial temperature after the heat pump unit is switched from the anti-freezing mode to the standby mode, and if yes, control the heat pump unit to be switched from the standby mode to the anti-freezing mode, wherein the target initial temperature is the highest temperature of the first inlet water temperature and the first outlet water temperature. The control device of the heat pump unit is configured to execute the control method of the heat pump unit according to any one of claims 11-15.

18. A heat pump unit, characterized by The heat pump unit comprises a refrigerant circulation loop and a water circulation loop, the water-side heat exchanger is included in the refrigerant circulation loop, the water-side heat exchanger, an anti-freezing valve and a water pump are included in the water circulation loop, and the refrigerant circulation loop and the water circulation loop exchange heat through the water-side heat exchanger. The heat pump unit is configured to operate according to the control method of the heat pump unit according to any one of claims 1-15.

19. A computer storage medium, comprising, The computer storage medium stores a plurality of instructions, and the instructions are adapted to be loaded and executed by the processor to perform the steps of the method according to any one of claims 1-15.

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