A water pump control method, device and equipment of a heat pump system and a storage medium

Abstract

Embodiments of the present application disclose a water pump control method, device and equipment of a heat pump system and a storage medium. When it is confirmed that the current operation mode of the heat pump system is a heating mode and the compressor is off, the outlet water temperature is detected every preset time, and the outlet water temperature is compared with a first threshold value and a second threshold value, the first threshold value being less than the second threshold value. When the outlet water temperature exceeds the first threshold value and is less than the second threshold value, the water pump is intermittently started and stopped until the first preset condition is met to exit the intermittent start and stop processing, the first preset condition including the compressor starting, the outlet water temperature being below a third threshold value or a shutdown instruction being received, the third threshold value being less than the first threshold value. When the outlet water temperature exceeds the second threshold value, the water pump is turned off. The embodiments can solve the problem of poor operation reliability of the existing heat pump system, prevent the water temperature and pressure in the heat pump system from being too high based on the regulation of the water pump during the shutdown of the compressor, and thus improve the operation reliability of the heat pump system.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of heat pump control, in particular to a water pump control method, device and equipment of a heat pump system and a storage medium. BACKGROUND

[0002] In the heat pump system, the compressor and the water pump are core components, and both of them are responsible for the circulation of refrigerant and the transfer of heat energy. Among them, the main function of the water pump is to drive the flow of water or other media, so as to realize the transfer of heat energy. Under the normal operation of the heat pump unit, the state of the refrigerant can be regulated through the cooperative work of the compressor and the water pump, so as to realize the effective transfer of heat energy.

[0003] In the actual operation process, there may be many reasons why the compressor cannot start or run normally, such as fault problems, waterway abnormalities or imperfect control system logic. At this time, based on the fact that the end device is not turned on, the heat dissipation is insufficient, if the water pump continues to run in this state, without the cooling effect of the refrigerant, the heat generated by the water pump cannot be released through an effective heat dissipation path, which will break the heat balance of the system, and will cause the water temperature in the heat pump system to continue to rise. Long-term high-temperature operation not only reduces the service life of the water pump, but also causes the pressure of the heat pump system to be too high, which will damage some components, such as heat exchangers or pipelines.

[0004] When the compressor is turned off, in order to prevent the water temperature and pressure in the heat pump system from being too high, a temperature control protection device is usually used for regulation and control. For example, a temperature sensor is used to detect the water temperature, and the water pump stops running when the water temperature exceeds the preset threshold. Based on the fact that the water pump stops running (i.e., the water pump is turned off), the original operating condition of the heat pump system is forced to stop, thereby affecting the operation reliability of the heat pump system. SUMMARY

[0005] Embodiments of the present application provide a water pump control method, device and equipment of a heat pump system and a storage medium, which can solve the problem of poor operation reliability of the existing heat pump system, and prevent the water temperature and pressure in the heat pump system from being too high based on the regulation and control of the water pump during the shutdown of the compressor, thereby improving the operation reliability of the heat pump system.

[0006] In a first aspect, embodiments of the present application provide a water pump control method of a heat pump system, comprising:

[0007] When it is confirmed that the current operating mode of the heat pump system is the heating mode and the compressor is turned off, the outlet water temperature is detected every preset time, and the outlet water temperature is compared with a first threshold value and a second threshold value, the first threshold value being less than the second threshold value;

[0008] intermittently starting and stopping the water pump until the first preset condition is met, the first preset condition including the compressor starting, the outlet water temperature being below a third threshold value or receiving a shutdown instruction, the third threshold value being less than the first threshold value;

[0009] when the outlet water temperature exceeds the second threshold value, the water pump is turned off.

[0010] Further, when the outlet water temperature exceeds the first threshold value and is less than the second threshold value, the water pump is intermittently started and stopped until the first preset condition is met, including:

[0011] when the outlet water temperature exceeds the first threshold value and is below a fourth threshold value, the outlet water temperature is continuously detected within a first preset time, and the outlet water temperature is compared with the first threshold value and the fourth threshold value, the fourth threshold value being greater than the first threshold value and less than the second threshold value;

[0012] when the outlet water temperature continuously exceeds the first threshold value and is below the fourth threshold value within the first preset time, the water pump is subjected to a first intermittent start-stop treatment, the first intermittent start-stop treatment being turning off the water pump and maintaining for a second preset time, turning on the water pump and maintaining for a third preset time, and repeatedly executing the turning off and turning on;

[0013] until the first preset condition is met, the first intermittent start-stop treatment is exited.

[0014] Further, when the outlet water temperature exceeds the first threshold value and is less than the second threshold value, the water pump is intermittently started and stopped until the first preset condition is met, including:

[0015] when the outlet water temperature exceeds the fourth threshold value and is below a second threshold value, the outlet water temperature is continuously detected within a first preset time, and the outlet water temperature is compared with the second threshold value and the fourth threshold value, the fourth threshold value being greater than the first threshold value and less than the second threshold value;

[0016] when the outlet water temperature continuously exceeds the fourth threshold value and is below the second threshold value within the first preset time, a second intermittent start-stop treatment is performed, the second intermittent start-stop treatment being turning off the water pump and maintaining for a fourth preset time, turning on the water pump and maintaining for a fifth preset time, and repeatedly executing the turning off and turning on;

[0017] until the first preset condition is met, the second intermittent start-stop treatment is exited.

[0018] Further, the water pump control method of the heat pump system further includes:

[0019] when it is confirmed that the current operation mode of the heat pump system is a cooling mode and the compressor is turned off, the outlet water temperature and the inlet water temperature are detected every preset time;

[0020] comparing the inlet water temperature with a fifth threshold value and a sixth threshold value, and comparing the outlet water temperature with a seventh threshold value and an eighth threshold value, the fifth threshold value being less than the sixth threshold value, and the seventh threshold value being less than the eighth threshold value;

[0021] when the inlet water temperature exceeds the fifth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds the seventh threshold value and is below the eighth threshold value, performing an intermittent start-stop treatment on the water pump until the second preset condition is met to exit the intermittent start-stop treatment, the second preset condition including a compressor start, an outlet water temperature below a ninth threshold value, or a shutdown instruction being received, the ninth threshold value being less than the seventh threshold value;

[0022] when the inlet water temperature exceeds the sixth threshold value and the outlet water temperature exceeds the eighth threshold value, shutting down the water pump.

[0023] Further, when the inlet water temperature exceeds the fifth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds the seventh threshold value and is below the eighth threshold value, performing an intermittent start-stop treatment on the water pump until the second preset condition is met to exit the intermittent start-stop treatment, including:

[0024] when the inlet water temperature exceeds the fifth threshold value and is below a tenth threshold value, and the outlet water temperature exceeds the seventh threshold value and is below an eleventh threshold value, continuously detecting the inlet water temperature and the outlet water temperature within a first preset time, the tenth threshold value being greater than the fifth threshold value and less than the sixth threshold value, and the eleventh threshold value being greater than the seventh threshold value and less than the eighth threshold value;

[0025] when the inlet water temperature exceeds the fifth threshold value and is below the tenth threshold value, and the outlet water temperature exceeds the seventh threshold value and is below the eleventh threshold value, continuously within the first preset time, performing a third intermittent start-stop treatment on the water pump, the third intermittent start-stop treatment being shutting down the water pump and maintaining for a sixth preset time, starting the water pump and maintaining for a seventh preset time, and repeatedly performing the shutting down and the starting;

[0026] until the second preset condition is met to exit the third intermittent start-stop treatment.

[0027] Further, when the inlet water temperature exceeds the fifth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds the seventh threshold value and is below the eighth threshold value, performing an intermittent start-stop treatment on the water pump until the second preset condition is met to exit the intermittent start-stop treatment, including:

[0028] when the inlet water temperature exceeds a tenth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds an eleventh threshold value and is below the seventh threshold value, continuously detecting the inlet water temperature and the outlet water temperature within a first preset time, the tenth threshold value being greater than the fifth threshold value and less than the sixth threshold value, and the eleventh threshold value being greater than the seventh threshold value and less than the eighth threshold value;

[0029] the water temperature exceeds the tenth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds the eleventh threshold value and is below the seventh threshold value, the water pump is subjected to fourth intermittent start-stop processing, the fourth intermittent start-stop processing being that the water pump is turned off and maintained for an eighth preset time, the water pump is turned on and maintained for a ninth preset time, and the turning off and turning on are repeatedly performed;

[0030] until the fourth intermittent start-stop processing is exited when the second preset condition is met.

[0031] Further, the water pump control method of the heat pump system further includes:

[0032] acquiring a preset water pump control strategy in a current operation mode;

[0033] after the intermittent start-stop processing is exited, including:

[0034] controlling the operation of the water pump according to the preset water pump control strategy.

[0035] In a second aspect, an embodiment of the present application provides a water pump control device of a heat pump system, including:

[0036] an outlet water temperature detection module, configured to detect the outlet water temperature every preset time when it is confirmed that the current operation mode of the heat pump system is a heating mode and the compressor is turned off, and compare the outlet water temperature with a first threshold value and a second threshold value, the first threshold value being less than the second threshold value;

[0037] an intermittent start-stop processing module, configured to subject the water pump to intermittent start-stop processing when the outlet water temperature exceeds the first threshold value and is less than the second threshold value, and exit the intermittent start-stop processing when a first preset condition is met, the first preset condition including that the compressor is started, the outlet water temperature is below a third threshold value, or a shutdown instruction is received, the third threshold value being less than the first threshold value;

[0038] a turning-off control module, configured to turn off the water pump when the outlet water temperature exceeds the second threshold value.

[0039] In a third aspect, an embodiment of the present application provides a water pump control device of a heat pump system, including:

[0040] a memory and one or more processors;

[0041] the memory is configured to store one or more programs;

[0042] when the one or more programs are executed by the one or more processors, the one or more processors implement the water pump control method of the heat pump system as described in the first aspect.

[0043] In a fourth aspect, an embodiment of the present application provides a storage medium storing computer executable instructions, which when executed by a computer processor, are used to perform the water pump control method of the heat pump system as described in the first aspect.

[0044] The embodiment of the present application detects the outlet water temperature every preset time when it is confirmed that the current operation mode of the heat pump system is the heating mode and the compressor is off, and compares the outlet water temperature with the first threshold value and the second threshold value. When the outlet water temperature exceeds the first threshold value and is less than the second threshold value, the water pump is intermittently started and stopped until the first preset condition is met to exit the intermittent start and stop processing. The first preset condition includes that the compressor is started, the outlet water temperature is below a third threshold value smaller than the first threshold value, or a shutdown instruction is received. By using the above technical means, the outlet water temperature can be reduced by intermittently starting and stopping the water pump. After the outlet water temperature is reduced based on the intermittent start and stop, the intermittent start and stop processing is exited, and the original preset water pump control strategy of the water pump is restored for regulation and control. In this way, the technical problem that the original operation condition of the heat pump system is affected by directly shutting down the water pump based on the excessively high water temperature during the shutdown of the compressor, resulting in low operation reliability of the heat pump system, can be avoided. The outlet water temperature is reduced by intermittently starting and stopping the water pump when the outlet water temperature is excessively high during the shutdown of the compressor. The intermittent start and stop processing is exited after the outlet water temperature is reduced to a preset value (i.e., below the third threshold value), and the original preset water pump control strategy of the water pump is restored for regulation and control. The outlet water temperature can be reduced without affecting the regulation and control of the preset water pump control strategy, preventing the water temperature and pressure in the heat pump system from being excessively high, thereby improving the operation reliability of the heat pump system. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a flowchart of a water pump control method of a heat pump system provided by an embodiment of the present application;

[0046] Figure 2 is a flowchart of another water pump control method of a heat pump system provided by an embodiment of the present application;

[0047] Figure 3 is a flowchart of a water pump control method in a heating mode provided by an embodiment of the present application;

[0048] Figure 4 is a flowchart of a water temperature overprotection method in a heating mode provided by an embodiment of the present application;

[0049] Figure 5 is a flowchart of a water pump control method in a cooling mode provided by an embodiment of the present application;

[0050] Figure 6 is a flowchart of a water temperature overprotection method in a cooling mode provided by an embodiment of the present application;

[0051] Figure 7 is a structural schematic diagram of a water pump control device of a heat pump system provided by an embodiment of the present application;

[0052] Figure 8 is a structural schematic diagram of a water pump control device of a heat pump system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the present application clearer, the specific embodiments of the present application are described in further detail below in combination with the drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only parts related to the present application are shown in the drawings, but not all contents. Before discussing the example embodiments in more detail, it should be mentioned that some example embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe each operation (or step) as a sequential process, many of the operations can be implemented in parallel, concurrently or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operations are completed, but can also have additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0054] In order to prevent the water temperature and pressure inside the heat pump system from being too high when the compressor is off, a temperature control protection device is usually used for regulation and control. For example, a temperature sensor is used to detect the water temperature, and the water pump stops running when the water temperature exceeds the preset threshold. Based on the water pump stopping running (i.e. the water pump is turned off), the original operating condition of the heat pump system is forced to stop, thereby affecting the operation reliability of the heat pump system

[0055] In addition, in the existing heat pump system, due to the limitation of control logic or hardware, there is a lack of necessary linkage between the heat pump host and the terminal device. In particular, when the terminal device (such as a floor heating valve or a fan disc) is closed, and the heat pump host is still running, the system may encounter the problem of low operating efficiency. In this case, once the water temperature reaches the set temperature, the heat pump host will stop, but the water pump will usually remain in the open state or run intermittently. At this time, the water pump is still circulating water in the water tank, and no longer transfers energy through the terminal device. Due to the lack of heat absorption of the terminal, the water in the water tank will continue to be heated due to the remaining heat of the heat pump system, resulting in a continuous rise in water temperature, thereby affecting the normal operation of the water pump or the heat pump host, increasing the wear of the equipment, thereby affecting the service life of the heat pump system, and also possibly causing the user to experience unnecessary energy waste.

[0056] In addition, in the existing heat pump system, a protection mechanism may be triggered, for example, low outlet water temperature protection, which is usually used to prevent the system from running in an abnormal state that may cause damage to the equipment or performance degradation. Therefore, when the outlet water temperature is lower than the set safety threshold, the existing protection mechanism usually shuts down the compressor, while the water pump may continue to run according to the settings. The original intention of this protection mechanism is to avoid the system from shutting down completely immediately when an abnormal state is detected, but to try to maintain partial functions for fault diagnosis or to wait for the conditions to improve. However, if the low outlet water temperature protection is triggered three times in a short period of time, the heat pump system will take more stringent protection measures, such as system lock, i.e., stopping all operations and not recovering to normal operation until the system is powered on again. Although this protection mechanism improves the safety of the system in the face of serious failures, it also brings new problems, such as after three low outlet water temperature protections, the water temperature in the system may continue to rise due to the lack of effective heat load, as the water pump continues to run while the compressor has been shut down, which may cause system lock and other problems, so that the system needs to be restarted to run, and the operation reliability of the heat pump system is low.

[0057] Therefore, the heat pump system water pump control method provided in the embodiments of the present application is provided to solve the technical problem of low operation reliability of the existing heat pump system. The heat pump system water pump control method, device, equipment and storage medium provided in the present application are used to detect the outlet water temperature every preset time when the current operation mode of the heat pump system is the heating mode and the compressor is off, compare the outlet water temperature with a first threshold value and a second threshold value, and perform intermittent start-stop processing on the water pump when the outlet water temperature is higher than the first threshold value and lower than the second threshold value, until the first preset condition is met to exit the intermittent start-stop processing, wherein the first preset condition includes compressor start, outlet water temperature below a third threshold value smaller than the first threshold value, or receiving a shutdown instruction. By using the above technical means, the outlet water temperature can be reduced by intermittently starting and stopping the water pump. After the outlet water temperature is reduced based on the intermittent start-stop method, the intermittent start-stop processing is exited, and the original preset water pump control strategy of the water pump is restored for regulation and control. In this way, the technical problem of low operation reliability of the heat pump system caused by directly shutting down the water pump based on the high water temperature when the compressor is off and affecting the original operation condition of the heat pump system can be avoided. By intermittently starting and stopping the water pump when the outlet water temperature is high during the off period of the compressor to reduce the outlet water temperature, and by exiting the intermittent start-stop processing when the outlet water temperature is reduced to a preset value (i.e., below the third threshold value) and restoring the original preset water pump control strategy of the water pump for regulation and control, the outlet water temperature can be reduced without affecting the regulation and control of the preset water pump control strategy, and the internal water temperature and pressure of the heat pump system are prevented from being too high, thereby improving the operation reliability of the heat pump system.

[0058] Figure 1 A flowchart of a water pump control method of a heat pump system is shown. The water pump control method of the heat pump system provided in the embodiment can be executed by a water pump control device of the heat pump system. The water pump control device of the heat pump system can be implemented in software and / or hardware. The water pump control device of the heat pump system can be two or more physical entities or one physical entity. Generally, the water pump control device of the heat pump system can be an electronic device corresponding to the heat pump system, such as an air conditioner.

[0059] The following describes an air conditioner as an example of a main body for executing the water pump control method of the heat pump system. Referring to Figure 1 The water pump control method of the heat pump system specifically includes:

[0060] S101, when it is confirmed that the current operation mode of the heat pump system is the heating mode and the compressor is off, detecting the outlet water temperature every preset time, and comparing the outlet water temperature with a first threshold value and a second threshold value, the first threshold value being less than the second threshold value.

[0061] The water pump is a connecting medium between the compressor and the terminal device. When the water pump is on, water or other medium in the compressor can flow to the terminal device for heat conversion. During the operation of the heat pump system, the compressor and the water pump work cooperatively, and the state of the refrigerant can be controlled based on the regulation and control of the water pump to achieve effective transfer of heat energy. In the heat pump system, the operation of the water pump is performed according to a preset water pump control strategy, and when the compressor is off, the water pump is regulated and controlled according to the water pump control method provided in the embodiment.

[0062] The current operation parameters of the heat pump system are obtained to determine the current operation mode of the heat pump system, wherein the operation mode includes the heating mode or the cooling mode. When it is confirmed that the current operation mode of the heat pump system is the heating mode and the compressor is off, the outlet water temperature is detected every preset time, for example, once every 10 minutes. The detected outlet water temperature is compared with a first threshold value and a second threshold value, wherein the first threshold value is less than the second threshold value. By detecting the outlet water temperature once every preset time when the heat pump system is in the heating mode and the compressor is off, it is determined whether the outlet water temperature is too high based on the comparison of the outlet water temperature with the first threshold value and the second threshold value. When the water temperature is too high, corresponding regulation and control can be performed to avoid the continuous increase of the water temperature and affect the operation of the heat pump system, thereby improving the operation reliability of the heat pump system.

[0063] S102, when the outlet water temperature exceeds the first threshold value and is less than the second threshold value, performing intermittent start-stop processing on the water pump until the first preset condition is met to exit the intermittent start-stop processing, the first preset condition including the start of the compressor, the outlet water temperature being below a third threshold value, or receiving a shutdown instruction, the third threshold value being less than the first threshold value.

[0064] After detecting the outlet water temperature, the outlet water temperature is compared with the first threshold value and the second threshold value, and when the outlet water temperature exceeds the first threshold value and is less than the second threshold value, it is represented that the outlet water temperature is relatively high, and then the water pump is intermittently started and stopped to reduce the outlet water temperature. The intermittent start and stop process can be understood as that the water pump is started for a period of time, then the water pump is stopped for a period of time, and the foregoing start and stop process is repeatedly executed. During the continuous execution of the intermittent start and stop process, if the first preset condition is met, the intermittent start and stop process is exited, and the preset water pump control strategy is restored, that is, the state (start or stop) of the water pump before the intermittent start and stop process is restored. The first preset condition includes that the compressor is started, the outlet water temperature is below the third threshold value, or a shutdown instruction is received, and the third threshold value is less than the first threshold value. The water pump control method provided in the embodiment is suitable for the case that the compressor is off, and when the compressor is started, the intermittent start and stop process is exited to execute the preset water pump control strategy, so as to avoid the conflict with the preset water pump control strategy, thereby improving the operation reliability of the heat pump system. Based on the third threshold value being less than the first threshold value and based on the intermittent start and stop process of the water pump, the outlet water temperature is reduced, and when the outlet water temperature is reduced to below the third threshold value, it is represented that the outlet water temperature is not high, and the intermittent start and stop process can be exited, so as to avoid the outlet water temperature being continuously reduced to trigger the protection mechanism and affect the normal operation of the heat pump system, thereby improving the operation reliability of the heat pump system. The third threshold value is set to be lower than the first threshold value as the threshold value for exiting the intermittent start and stop process. If the outlet water temperature is set to be below the first threshold value to exit the intermittent start and stop process, based on the outlet water temperature possibly fluctuating, the intermittent start and stop process and the exit of the intermittent start and stop process may be repeatedly executed, and the operation pressure of the heat pump system is increased. Therefore, when the outlet water temperature is set to be below the third threshold value which is lower than the first threshold value to exit the intermittent start and stop process, the operation reliability of the heat pump can be improved. During the intermittent start and stop process, if a shutdown instruction is received, it is represented that the heat pump system needs to be completely shut down, and then the intermittent start and stop process needs to be exited, and the state (start or stop) of the water pump before the intermittent start and stop process is restored, so as to avoid the state of the water pump being changed based on not exiting the intermittent start and stop process after restarting, thereby affecting the original operation condition of the heat pump system, and thereby improving the overall reliability of the operation of the heat pump system.

[0065] S103、In the case that the outlet water temperature exceeds the second threshold value, the water pump is stopped.

[0066] After detecting the outlet water temperature, the outlet water temperature is compared with the first threshold value and the second threshold value, and when the outlet water temperature exceeds the second threshold value, it is represented that the outlet water temperature is very high, and the intermittent start and stop process cannot quickly reduce the water temperature, and therefore the water pump is stopped to reduce the outlet water temperature. At the same time that the water pump is stopped, a fault prompt is performed, for example, a fault reminding sound is emitted or a light prompting or a line controller panel fault prompting is performed, so as to provide the user with attention to the current high water temperature.

[0067] The above, during the compressor off period, when the outlet water temperature is too high, the water pump is intermittently started and stopped to reduce the outlet water temperature, and when the outlet water temperature is reduced to a preset value (i.e. below the third threshold), the intermittent start and stop process is exited, and the original preset water pump control strategy of the water pump is restored. The control can reduce the outlet water temperature without affecting the control of the preset water pump control strategy, prevent the internal water temperature and pressure of the heat pump system from being too high, and thus improve the operation reliability of the heat pump system. When the outlet water temperature exceeds the second threshold, the water pump is turned off to prevent the outlet water temperature from continuing to rise, thereby improving the operation reliability of the heat pump system, and a fault prompt is given to remind the user to pay attention, thereby improving the user's experience. In addition, the present embodiment determines whether the water temperature is too high based on the outlet water temperature. Compared with the prior art, which determines whether the water temperature is too high based on the inlet water temperature, the present embodiment is based on the fact that the outlet water temperature is close to the terminal device, so the detection is more accurate, thereby improving the accuracy of the water pump control.

[0068] In an embodiment, to improve the control accuracy of the intermittent start and stop process, a fourth threshold is set between the first threshold and the second threshold to perform a graded intermittent start and stop process. The fourth threshold is greater than the first threshold and less than the second threshold. The outlet water temperature is detected every preset time, and when the detected outlet water temperature exceeds the first threshold and is below the fourth threshold, the outlet water temperature is fluctuating, so the detected outlet water temperature can be continuously detected within the first preset time, and the detected outlet water temperature is compared with the first threshold and the fourth threshold. If the detected outlet water temperature within the first preset time exceeds the first threshold and is below the fourth threshold, the water pump is subjected to a first intermittent start and stop process to reduce the outlet water temperature. The first intermittent start and stop process is to turn off the water pump for a second preset time, turn on the water pump for a third preset time, and re-execute the turning off and turning on. During the first intermittent start and stop process, the outlet water temperature is also detected every preset time. During the first intermittent start and stop process, until the first preset condition is met, the first intermittent start and stop process is exited, and the preset water pump control strategy is restored, i.e. the state (on or off) of the water pump before the intermittent start and stop process is restored.

[0069] The outlet water temperature is detected every preset time interval. When the detected outlet water temperature exceeds the fourth threshold value and is below the second threshold value, it is determined that the outlet water temperature fluctuates, and thus the outlet water temperature is continuously detected for the first preset time interval, and the detected outlet water temperature is compared with the fourth threshold value and the second threshold value. If the detected outlet water temperature exceeds the fourth threshold value and is below the second threshold value in the first preset time interval, the second intermittent start-stop treatment is performed on the water pump to reduce the outlet water temperature. The second intermittent start-stop treatment is that the water pump is turned off for a fourth preset time interval, turned on for a fifth preset time interval, and the turning off and turning on are repeatedly performed. During the second intermittent start-stop treatment, the outlet water temperature is continuously detected every preset time interval. During the second intermittent start-stop treatment, when the first preset condition is met, the second intermittent start-stop treatment is exited, and the preset water pump control strategy is restored, that is, the state (turned on or turned off) of the water pump before the intermittent start-stop treatment is restored.

[0070] For example, assuming that the heating stop temperature is T03, the first threshold value is T03+2, the second threshold value is T03+8, the third threshold value is R01-2, T03=R01+R03, R01 is a heating target temperature (user setting), and R03 is a heating stop hysteresis (user setting), that is, the third threshold value is T03-R03-2, and the third threshold value is less than the first threshold value, and the fourth threshold value is T03+4. The outlet water temperature is represented by T02, and the preset detection period is 10 minutes. When it is determined that the current operating mode of the heat pump system is the heating mode and the compressor is turned off, the outlet water temperature T02 is detected every 10 minutes. When T03+2≤T02

[0071] When it is confirmed that the current operation mode of the heat pump system is the heating mode and the compressor is off, the outlet water temperature T02 is detected every 10 minutes, and when T03+4≤T02

[0072] It should be noted that the closing time of the water pump in the second intermittent start-stop treatment is longer than that in the first intermittent start-stop treatment, that is, the fourth preset time is greater than the second preset time. Since the outlet water temperature corresponding to the second intermittent treatment is higher than that corresponding to the first intermittent treatment, the closing time of the water pump needs to be increased to improve the cooling speed and cooling effect.

[0073] When it is confirmed that the current operation mode of the heat pump system is the heating mode and the compressor is off, the outlet water temperature T02 is detected every 10 minutes, and when T02≥T03+8 is detected, the outlet water temperature T02 is detected for 10 seconds and judged, which can be every 1 second in the 10 seconds. If T02≥T03+8 is detected in these 10 seconds, it means that the outlet water temperature is very high, and the intermittent start-stop treatment cannot quickly reduce the water temperature, so the water pump is closed to reduce the outlet water temperature. At the same time of closing the water pump, a fault prompt is performed, for example, a fault prompt sound is emitted or a light prompt is performed or a fault prompt is performed on the faceplate of the wire control device, so as to attract the user's attention to the current high water temperature.

[0074] On the basis of the above-mentioned embodiments, Figure 2 is a flowchart of another water pump control method of a heat pump system provided by the present application, which is described with reference to Figure 2 The water pump control method of the heat pump system specifically comprises:

[0075] S201, when it is confirmed that the current operation mode of the heat pump system is the cooling mode and the compressor is off, the outlet water temperature and the inlet water temperature are detected every preset time.

[0076] The current operation parameters of the heat pump system are acquired to determine the current operation mode of the heat pump system, wherein the operation mode includes a heating mode or a cooling mode. When it is confirmed that the current operation mode of the heat pump system is the cooling mode and the compressor is off, the outlet water temperature and the inlet water temperature are detected every preset time, for example, the outlet water temperature and the inlet water temperature are detected once every 10 minutes, and whether the water temperature is too high is determined based on the high and low of the outlet water temperature and the inlet water temperature. The above, by detecting the outlet water temperature and the inlet water temperature every preset time when the cooling mode and the compressor are off, whether the water temperature is too high is determined based on the outlet water temperature and the inlet water temperature, when the water temperature is too high, corresponding regulation and control can be carried out to avoid the water temperature continuing to rise and affecting the operation of the heat pump system, thereby improving the operation reliability of the heat pump system.

[0077] S202, compare the inlet water temperature with the fifth threshold value and the sixth threshold value, and compare the outlet water temperature with the seventh threshold value and the eighth threshold value, the fifth threshold value is less than the sixth threshold value, and the seventh threshold value is less than the eighth threshold value.

[0078] When it is determined that the current operation mode of the heat pump system is the cooling mode and the compressor is off, the outlet water temperature and the inlet water temperature are detected every preset time, the detected inlet water temperature is compared with the fifth threshold value and the sixth threshold value to determine whether the inlet water temperature is too high, and the detected outlet water temperature is compared with the seventh threshold value and the eighth threshold value to determine whether the outlet water temperature is too high. The fifth threshold value is less than the sixth threshold value, and the seventh threshold value is less than the eighth threshold value. The above, by detecting the inlet water temperature and the outlet water temperature every preset time when the cooling mode and the compressor are off, whether the water temperature is too high is determined based on the comparison of the inlet water temperature with the fifth threshold value and the sixth threshold value and the comparison of the outlet water temperature with the seventh threshold value and the eighth threshold value, when the water temperature is too high, corresponding regulation and control can be carried out to avoid the water temperature continuing to rise and affecting the operation of the heat pump system, thereby improving the operation reliability of the heat pump system.

[0079] S203, when the inlet water temperature exceeds the fifth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds the seventh threshold value and is below the eighth threshold value, the water pump is intermittently started and stopped until the second preset condition is met to exit the intermittent start and stop processing, the second preset condition includes that the compressor is started, the outlet water temperature is below the ninth threshold value or a shutdown instruction is received, and the ninth threshold value is less than the seventh threshold value.

[0080] After detecting the inlet water temperature and the outlet water temperature, the detected inlet water temperature is compared with a fifth threshold value and a sixth threshold value, and the detected outlet water temperature is compared with a seventh threshold value and an eighth threshold value. When the inlet water temperature exceeds the fifth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds the seventh threshold value and is below the eighth threshold value, it is indicated that the water temperature of the heat pump system is relatively high. Then, intermittent start-stop processing is performed on the water pump to reduce the outlet water temperature. The intermittent start-stop processing can be understood as that the water pump is turned on for a period of time, then turned off for a period of time, and the foregoing turning on and turning off are repeatedly performed. During the intermittent start-stop processing, if a second preset condition is met, the intermittent start-stop processing is exited, and a preset water pump control strategy is restored, that is, the state (turned on or turned off) of the water pump before the intermittent start-stop processing is restored. The second preset condition includes that the compressor is started, the outlet water temperature is below a ninth threshold value, or a shutdown instruction is received, where the ninth threshold value is lower than the seventh threshold value. The water pump control method provided in this embodiment is suitable for when the compressor is turned off. When the compressor is started, the intermittent start-stop processing is exited to perform the preset water pump control strategy, so as to avoid conflict with the preset water pump control strategy, thereby improving the operation reliability of the heat pump system. Based on the fact that the ninth threshold value is lower than the seventh threshold value and based on the intermittent start-stop processing of the water pump, the outlet water temperature is reduced. When the outlet water temperature is reduced to below the ninth threshold value, it is indicated that the outlet water temperature is not high, and the intermittent start-stop processing can be exited. This avoids the outlet water temperature from being continuously reduced to trigger a protection mechanism and affect the normal operation of the heat pump system, thereby improving the operation reliability of the heat pump system. In addition, the outlet water temperature is close to the terminal device. Therefore, when it is determined whether to exit the intermittent start-stop processing, only the outlet water temperature is used for determination. Compared with the inlet water temperature, the outlet water temperature is close to the terminal device. Therefore, it is more accurate to determine whether to exit the intermittent start-stop processing based on the outlet water temperature. The ninth threshold value that is lower than the seventh threshold value is set as the threshold value for exiting the intermittent start-stop processing. If the outlet water temperature is set to be below the seventh threshold value to exit the intermittent start-stop processing, the outlet water temperature may fluctuate. Therefore, the intermittent start-stop processing and the exiting of the intermittent start-stop processing may be repeatedly performed, which increases the operation pressure of the heat pump system. Therefore, the outlet water temperature is set to be below the ninth threshold value that is lower than the seventh threshold value to exit the intermittent start-stop processing, which can improve the reliability of the heat pump operation. During the intermittent start-stop processing, if a shutdown instruction is received, it is indicated that the heat pump system needs to be completely shut down. Therefore, the intermittent start-stop processing needs to be exited first, and the state (turned on or turned off) of the water pump before the intermittent start-stop processing is restored. This avoids the state of the water pump from being changed after the restart based on the fact that the intermittent start-stop processing is not exited, which affects the original operating condition of the heat pump system, thereby improving the overall reliability of the heat pump system.

[0081] S204、In the case that the inlet water temperature exceeds the sixth threshold value and the outlet water temperature exceeds the eighth threshold value, the water pump is turned off.

[0082] After detecting the outlet water temperature and the inlet water temperature, the detected inlet water temperature is compared with the fifth threshold value and the sixth threshold value, and the detected outlet water temperature is compared with the seventh threshold value and the eighth threshold value. When the inlet water temperature exceeds the sixth threshold value and the outlet water temperature exceeds the eighth threshold value, it indicates that the water temperature in the heat pump system is very high, and the intermittent start-stop treatment cannot quickly reduce the water temperature. Therefore, the water pump is turned off to reduce the outlet water temperature. At the same time when the water pump is turned off, a fault prompt is performed, such as issuing a fault reminder sound or performing a light prompt or a fault prompt on the faceplate of the wire controller, to attract the user's attention to the current high water temperature.

[0083] As described above, during the shutdown of the compressor, the water temperature in the heat pump system is determined to be too high based on the outlet water temperature and the inlet water temperature, and the intermittent start-stop treatment is performed to reduce the water temperature. When the outlet water temperature is reduced to a preset value (i.e., below the ninth threshold value), the intermittent start-stop treatment is exited, and the original preset water pump control strategy of the water pump is restored. This can reduce the water temperature without affecting the control of the preset water pump control strategy, prevent the water temperature and pressure in the heat pump system from being too high, and thus improve the operation reliability of the heat pump system. When the inlet water temperature exceeds the sixth threshold value and the outlet water temperature exceeds the eighth threshold value, the water pump is turned off to prevent the outlet water temperature from continuing to rise, thereby improving the operation reliability of the heat pump system, and a fault prompt is performed to remind the user to pay attention, thereby improving the user experience.

[0084] In an embodiment, to improve the control accuracy of the intermittent start-stop treatment, a tenth threshold value is set between the fifth threshold value and the sixth threshold value, and an eleventh threshold value is set between the seventh threshold value and the eighth threshold value, to perform a graded intermittent start-stop treatment judgment and execution. The tenth threshold value is greater than the fifth threshold value and less than the sixth threshold value. The outlet water temperature and the inlet water temperature are detected every preset time. When the detected inlet water temperature exceeds the fifth threshold value and is below the tenth threshold value, and the detected outlet water temperature exceeds the seventh threshold value and is below the eleventh threshold value, there is a fluctuation in the outlet water temperature and the inlet water temperature. Therefore, the detected outlet water temperature and the detected inlet water temperature can be continuously detected within a first preset time, and the detected inlet water temperature is compared with the fifth threshold value and the tenth threshold value, and the detected outlet water temperature is compared with the seventh threshold value and the eleventh threshold value. If the detected inlet water temperature exceeds the fifth threshold value and is below the tenth threshold value, and the detected outlet water temperature exceeds the seventh threshold value and is below the eleventh threshold value, within the first preset time, a third intermittent start-stop treatment is performed on the water pump to reduce the outlet water temperature. The third intermittent start-stop treatment is to turn off the water pump for a sixth preset time, turn on the water pump for a seventh preset time, and re-execute the turning off and turning on. During the third intermittent start-stop treatment, the outlet water temperature is also continuously detected every preset time. During the third intermittent start-stop treatment, until a second preset condition is met, the third intermittent start-stop treatment is exited, and the preset water pump control strategy is restored, i.e., the state (on or off) of the water pump before the intermittent start-stop treatment is restored.

[0085] The outlet water temperature and the inlet water temperature are detected every preset time. When it is detected that the inlet water temperature exceeds the tenth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds the eleventh threshold value and is below the seventh threshold value, there is fluctuation in the outlet water temperature and the inlet water temperature, so the outlet water temperature and the inlet water temperature are continuously detected for a first preset time, and the detected inlet water temperature is compared with the tenth threshold value and the sixth threshold value, and the detected outlet water temperature is compared with the eleventh threshold value and the eighth threshold value. If the detected inlet water temperature exceeds the tenth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds the eleventh threshold value and is below the seventh threshold value, the fourth intermittent start-stop treatment is performed on the water pump to reduce the outlet water temperature. The fourth intermittent start-stop treatment is that the water pump is turned off for an eighth preset time, turned on for a ninth preset time, and the turning off and turning on are performed again. During the fourth intermittent start-stop treatment, the detection of the outlet water temperature and the inlet water temperature every preset time is continued. During the second intermittent start-stop treatment, until the second preset condition is met, the fourth intermittent start-stop treatment is exited, and the preset water pump control strategy is restored, that is, the state (turned on or turned off) of the water pump before the intermittent start-stop treatment is restored.

[0086] For example, assume that the refrigeration shutdown temperature is T04, where T04 takes the maximum of R02+R04 and T05+R04, where R02 is the refrigeration target temperature (user set), R04 is the refrigeration startup hysteresis (user set), and T05 is the instantaneous water inlet temperature at shutdown (program calculated). The fifth threshold is set to T04+5, the sixth threshold is set to T04+11, the seventh threshold is set to T04+5, the eighth threshold is set to T04+11, the ninth threshold is set to R02+R04, where T04 takes the maximum of R02+R04 and T05+R04, i.e., the ninth threshold is set to the maximum of T04 and T05, and the tenth threshold is set to T04+7, the eleventh threshold is set to T04+7, based on the seventh threshold of T04+5, the ninth threshold is less than the seventh threshold, and the tenth threshold is greater than the ninth threshold. The water inlet temperature is denoted by T01, the water outlet temperature is denoted by T02, and the preset detection period is 10 minutes. When it is confirmed that the current operating mode of the heat pump system is the refrigeration mode and the compressor is off, the water inlet temperature T01 and the water outlet temperature T02 are detected every 10 minutes, and when T04+5≤T01

[0087] When it is confirmed that the current operation mode of the heat pump system is the cooling mode and the compressor is off, the inlet water temperature T01 and the outlet water temperature T02 are detected every 10 minutes. When T04+7≤T01<T04+11 and T04+7≤T02<T04+11 are detected, the inlet water temperature T01 and the outlet water temperature T02 are detected for 10 seconds and judged. The detection can be performed every 1 second in the 10 seconds. If T04+7≤T01<T04+11 and T04+7≤T02<T04+11 are detected in the 10 seconds, the fourth intermittent start-stop treatment is performed on the water pump. At this time, no fault prompt is given. The fourth intermittent start-stop treatment can be that the water pump is first closed for 20 minutes, then opened for 1 minute, and then the cycle of closing for 20 minutes and opening for 1 minute is repeated. During the fourth intermittent start-stop treatment, the inlet water temperature and the outlet water temperature are still detected every 10 minutes. During the fourth intermittent start-stop treatment, until the compressor is started, T02≤R02+R04 (i.e., the outlet water temperature is below the ninth threshold value) or a shutdown instruction is received, the fourth intermittent start-stop treatment is exited, and the preset water pump control strategy is restored, i.e., the state (opened or closed) of the water pump before the intermittent start-stop treatment is restored.

[0088] It should be noted that the closing time of the water pump in the fourth intermittent start-stop treatment is longer than that in the third intermittent start-stop treatment, i.e., the eighth preset time is greater than the sixth preset time. Since the outlet water temperature corresponding to the fourth intermittent treatment is higher than that corresponding to the third intermittent treatment, and the inlet water temperature corresponding to the fourth intermittent treatment is higher than that corresponding to the third intermittent treatment, the closing time of the water pump needs to be increased to reduce the cooling speed and improve the cooling effect.

[0089] When it is confirmed that the current operation mode of the heat pump system is the cooling mode and the compressor is off, the inlet water temperature T01 and the outlet water temperature T02 are detected every 10 minutes. When T01≥T04+11 and T02≥T04+11 are detected, the inlet water temperature T01 and the outlet water temperature T02 are detected for 10 seconds and judged. The detection can be performed every 1 second in the 10 seconds. If T01≥T04+11 and T02≥T04+11 are detected in the 10 seconds, it means that the water temperature inside the heat pump system is very high, and the intermittent start-stop treatment cannot quickly reduce the water temperature. Therefore, the water pump is closed to reduce the outlet water temperature. At the same time, a fault prompt is given, such as a fault reminder sound or a light prompt or a fault prompt on the faceplate of the wire controller, to attract the user's attention to the current high water temperature.

[0090] The parameters used in the foregoing and the corresponding explanations are shown in Table 1 as follows:

[0091]

[0092]

[0093] Table 1

[0094] Figure 3 is a water pump control method flow chart in a heating mode provided by the embodiment of the application, referring to Figure 3 The water pump control method comprises the following steps.

[0095] S301, power on.

[0096] After the heat pump system is powered on, the heat pump system is started, and the water pump control is performed.

[0097] S302, execute once every preset time.

[0098] The following S303-S315 are executed once every preset time, for example, once every 60 seconds.

[0099] S303, whether heating is running.

[0100] According to the running parameters, it is determined whether the current running mode of the heat pump system is the heating mode, if yes, S304 and S305 are executed, if not, S306 is executed.

[0101] S304, whether it is a start-up state.

[0102] It is determined whether the current is a start-up state, if yes, S307 is executed, if not, S302 is executed.

[0103] S305, whether the compressor is closed.

[0104] It is determined whether the current compressor is in a closed state, if yes, S307 is executed, if not, S302 is executed.

[0105] S306, other control logic.

[0106] According to the running parameters, it is determined whether the current running mode of the heat pump system is the heating mode, if not, other control logic is executed.

[0107] S307, whether the water pump is on.

[0108] It is determined whether the water pump is in an on state, if yes, S308 is executed, if not, S302 is executed.

[0109] S308, timing.

[0110] In the heating mode, in the start-up state and the compressor in the closed state, timing is started to detect the outlet water temperature T02 once every preset time. After the timing is started, S309 is executed.

[0111] S309, whether the time is ≥10min.

[0112] After starting the timer, it is determined whether the time reaches 10 minutes. If the time is greater than or equal to 10 minutes, S310 is executed. If the time is less than 10 minutes, S302 is executed.

[0113] S310, whether T02 is greater than or equal to T03+8.

[0114] It is determined whether T02 is greater than or equal to T03+8, where T02 is the outlet water temperature and T03 is the heating stop temperature. If yes, S311 is executed. If no, S312 is executed.

[0115] S311, three-level heating water temperature overprotection.

[0116] When T02 is greater than or equal to T03+8, the corresponding action of the three-level heating water temperature overprotection is executed, that is, the water pump is turned off and a fault prompt is given.

[0117] S312, whether T02 is greater than or equal to T03+4.

[0118] It is determined whether T02 is greater than or equal to T03+4, where T02 is the outlet water temperature and T03 is the heating stop temperature. If yes, S313 is executed. If no, S314 is executed.

[0119] S313, two-level heating water temperature overprotection.

[0120] When T03+8 is greater than or equal to T02 and T03+4, the corresponding action of the two-level heating water temperature overprotection is executed, that is, the second intermittent start-stop processing is executed. The specific steps of the second intermittent start-stop processing are the same as described above, and will not be repeated here.

[0121] S314, whether T02 is greater than or equal to T03+2.

[0122] It is determined whether T02 is greater than or equal to T03+2, where T02 is the outlet water temperature and T03 is the heating stop temperature. If yes, S315 is executed. If no, S302 is executed.

[0123] S315, one-level heating water temperature overprotection.

[0124] When T03+4 is greater than or equal to T02 and T03+2, the corresponding action of the one-level heating water temperature overprotection is executed, that is, the first intermittent start-stop processing is executed. The specific steps of the first intermittent start-stop processing are the same as described above, and will not be repeated here.

[0125] Figure 4 is a flow chart of a water temperature overprotection method in a heating mode provided by an embodiment of the present application. Referring to Figure 4 , the water temperature overprotection method in the heating mode specifically includes:

[0126] S401, start.

[0127] On the basis of the foregoing implementation, when it is determined that the water temperature is excessively high, a water temperature excessively high protection method described below is executed.

[0128] S402, primary heating water temperature excessively high protection.

[0129] The primary heating water temperature excessively high protection corresponds to the foregoing first intermittent start-stop processing. The process of determining whether to execute the primary heating water temperature excessively high protection is the same as the determination process of the foregoing first intermittent start-stop processing, and thus is not described again here. When it is determined that the primary heating water temperature excessively high protection needs to be executed, S405 is executed.

[0130] S403, secondary heating water temperature excessively high protection.

[0131] The secondary heating water temperature excessively high protection corresponds to the foregoing second intermittent start-stop processing. The process of determining whether to execute the secondary heating water temperature excessively high protection is the same as the determination process of the foregoing second intermittent start-stop processing, and thus is not described again here. When it is determined that the secondary heating water temperature excessively high protection needs to be executed, S406 is executed.

[0132] S404, tertiary heating water temperature excessively high protection.

[0133] When it is determined that the tertiary heating water temperature excessively high protection needs to be executed, S407 is executed.

[0134] S405, water pump is turned off for 10 minutes and turned on for 1 minute.

[0135] When it is determined that the primary heating water temperature excessively high protection needs to be executed, the water pump is turned off for 10 minutes and turned on for 1 minute. During the execution, it is determined whether S408 is met.

[0136] S406, water pump is turned off for 20 minutes and turned on for 1 minute.

[0137] When it is determined that the secondary heating water temperature excessively high protection needs to be executed, the water pump is turned off for 20 minutes and turned on for 1 minute. During the execution, it is determined whether S408 is met.

[0138] S407, water pump is turned off and a fault is prompted.

[0139] When it is determined that the tertiary heating water temperature excessively high protection needs to be executed, the water pump is turned off and a fault is prompted.

[0140] S408, whether the compressor start condition is met.

[0141] During the execution of the primary heating water temperature excessively high protection or the secondary heating water temperature excessively high protection, it is determined whether the compressor start condition is met. If the compressor start condition is met, S409 is executed. If the compressor start condition is not met, S410 is executed.

[0142] S409, exit protection.

[0143] If it is determined that the compressor start condition is met, that is, the compressor is in an open state at this time, the water temperature is too high protection is exited, and the water pump is controlled according to the preset water pump control strategy corresponding to the compressor open.

[0144] S410, whether T02≤R01-2.

[0145] If it is determined that the compressor start condition is not met, that is, the compressor is still in a closed state at this time, it is determined whether T02≤R01-2, wherein T02 is the outlet water temperature (obtained by detection), and R01 is the heating target temperature (set by a user). If yes, that is, T02≤R01-2, S409 is executed, and if no, S411 is executed.

[0146] S411, whether the shutdown state.

[0147] If T02≤R01-2 is not met, it is further determined whether the current is in a shutdown state, that is, whether the shutdown execution will be received, if yes, S409 is executed, and if no, S401 is returned.

[0148] Figure 5 is a water pump control method flowchart in a refrigeration mode provided by an embodiment of the present application, referring to Figure 5 , the water temperature is too high protection method in the refrigeration mode specifically includes:

[0149] S501, power on.

[0150] After the heat pump system is powered on, the heat pump system is started, and the water pump control is performed.

[0151] S502, executed once every preset time.

[0152] The following S503-S515 are executed once every preset time, for example, executed once every 60 seconds.

[0153] S503, whether running refrigeration.

[0154] It is determined according to the running parameter whether the current running mode of the heat pump system is the refrigeration mode, if yes, S504 and S505 are executed, and if no, S506 is executed.

[0155] S504, whether the start state.

[0156] It is determined whether the current is the start state, if yes, S507 is executed, and if no, S502 is executed.

[0157] S505, whether the compressor is closed.

[0158] It is determined whether the current compressor is in a closed state, if yes, S507 is executed, and if no, S502 is executed.

[0159] S506, other control logic.

[0160] According to the operating parameter, it is determined whether the current operating mode of the heat pump system is the refrigeration mode, and if not, other control logic is executed.

[0161] S507, whether the water pump is on.

[0162] It is determined whether the water pump is in the on state, and if so, S508 is executed, and if not, S502 is executed.

[0163] S508, timing.

[0164] In the refrigeration mode, in the on state and the compressor in the off state, the timing is started to detect the water inlet temperature T01 and the water outlet temperature T02 every preset time. After starting the timing, S509 is executed.

[0165] S509, whether the time is ≥10min.

[0166] After starting the timing, it is determined whether the time reaches 10min(min), and S510 is executed when the time is ≥10min, and S502 is executed if the time is not ≥10min.

[0167] S510, whether T01≥T04+11 and T02≥T04+11.

[0168] It is determined whether T01≥T04+11 and T02≥T04+11, wherein T01 is the water inlet temperature, T02 is the water outlet temperature, and T04 is the refrigeration shutdown temperature; if so, S511 is executed, and if not, S512 is executed.

[0169] S511, three-level refrigeration water temperature overprotection.

[0170] When T01≥T04+11 and T02≥T04+11, the corresponding action of three-level refrigeration water temperature overprotection is executed, that is, the water pump is turned off and the fault prompt is executed.

[0171] S512, whether T01≥T04+7 and T02≥T04+7.

[0172] It is determined whether T01≥T04+7 and T02≥T04+7, wherein T01 is the water inlet temperature, T02 is the water outlet temperature, and T04 is the refrigeration shutdown temperature; if so, S513 is executed, and if not, S514 is executed.

[0173] S513, two-level refrigeration water temperature overprotection.

[0174] When T01≥T04+7 and T02≥T04+7, a second-level refrigeration water temperature overprotection corresponding action is executed, that is, a fourth intermittent start-stop process is executed. The specific steps of the fourth intermittent start-stop process are the same as the foregoing, and are not described herein.

[0175] S514, whether T01≥T04+5 and T02≥T04+5.

[0176] It is determined whether T01≥T04+5 and T02≥T04+5, where T01 is the inlet water temperature, T02 is the outlet water temperature, and T04 is the refrigeration shutdown temperature; if yes, S515 is executed, and if no, S502 is executed.

[0177] S515, first-level refrigeration water temperature overprotection.

[0178] When T01≥T04+5 and T02≥T04+5, a first-level refrigeration water temperature overprotection corresponding action is executed, that is, a third intermittent start-stop process is executed. The specific steps of the third intermittent start-stop process are the same as the foregoing, and are not described herein.

[0179] Figure 6 is a water temperature overprotection method flowchart in a refrigeration mode provided by the embodiment of the present application, referring to Figure 6 , the water temperature overprotection method in the refrigeration mode specifically includes:

[0180] S601, start.

[0181] On the basis of the foregoing implementation, when it is determined that the water temperature is too high, a water temperature overprotection method described below is executed.

[0182] S602, first-level refrigeration water temperature overprotection.

[0183] The first-level refrigeration water temperature overprotection corresponds to the foregoing third intermittent start-stop process, and the process of determining whether to execute the first-level refrigeration water temperature overprotection is the same as the determination process of the foregoing third intermittent start-stop process, which is not described herein. When it is determined that the first-level refrigeration water temperature overprotection needs to be executed, S605 is executed.

[0184] S603, second-level refrigeration water temperature overprotection.

[0185] The second-level refrigeration water temperature overprotection corresponds to the foregoing fourth intermittent start-stop process, or the process of determining whether to execute the second-level refrigeration water temperature overprotection is the same as the determination process of the foregoing fourth intermittent start-stop process, which is not described herein. When it is determined that the second-level refrigeration water temperature overprotection needs to be executed, S606 is executed.

[0186] S604, third-level refrigeration water temperature overprotection.

[0187] S607 is executed when it is determined that the third level of the refrigeration water temperature overhigh protection needs to be executed.

[0188] S605 is executed by turning off the water pump for 10 minutes and turning on the water pump for 1 minute.

[0189] When it is determined that the first level of the refrigeration water temperature overhigh protection needs to be executed, the water pump is turned off for 10 minutes and turned on for 1 minute, and it is determined whether S608 is met during the execution.

[0190] S606 is executed by turning off the water pump for 20 minutes and turning on the water pump for 1 minute.

[0191] When it is determined that the second level of the refrigeration water temperature overhigh protection needs to be executed, the water pump is turned off for 20 minutes and turned on for 1 minute, and it is determined whether S608 is met during the execution.

[0192] S607 is executed by turning off the water pump and giving a fault prompt.

[0193] When it is determined that the third level of the refrigeration water temperature overhigh protection needs to be executed, the water pump is turned off, and a fault prompt is given.

[0194] S608 is executed by determining whether the compressor start condition is met.

[0195] During the execution of the first level of the refrigeration water temperature overhigh protection or the second level of the refrigeration water temperature overhigh protection, it is determined whether the compressor start condition is met, if met, S609 is executed, and if not met, S610 is executed.

[0196] S609 is executed by exiting the protection.

[0197] If it is determined that the compressor start condition is met, that is, the compressor is in an open state at this time, the water temperature overhigh protection is exited, and the water pump is controlled according to the preset water pump control strategy corresponding to the compressor open state.

[0198] S610 is executed by determining whether T02≤R02+R04.

[0199] If it is determined that the compressor start condition is not met, that is, the compressor is still in a closed state at this time, it is determined whether T02≤R02+R04, wherein T02 is the outlet water temperature (detected), R02 is the refrigeration target temperature (set by the user), and R04 is the refrigeration start hysteresis (set by the user). If yes, that is, T02≤R02+R04, S609 is executed, and if no, S611 is executed.

[0200] S611 is executed by determining whether the machine is in an off state.

[0201] If T02≤R02+R04 is not met, it is further determined whether the machine is in an off state, that is, whether a shutdown execution will be received, if yes, S609 is executed, and if no, S601 is returned.

[0202] The above, through the hierarchical protection logic, effectively avoids the problem of water temperature being too high caused by abnormal closing of the compressor, improves the reliability and safety of the heat pump system. Through the intermittent start-up strategy of the water pump, different degrees of fault state are flexibly responded to, which not only protects the equipment in the heat pump system, but also reduces unnecessary energy consumption. The recovery mechanism mode and the complete closing of the water pump ensure that the system can quickly and safely recover to normal operation after the fault is removed, so as to solve the problem of water temperature being too high that may occur in the heat pump system under certain working conditions, ensure the safe and efficient operation of the heat pump system, and thus improve the overall efficiency of the system and user satisfaction.

[0203] The above, by confirming that the current operation mode of the heat pump system is the heating mode and the compressor is closed, detecting the outlet water temperature every preset time, and comparing the outlet water temperature with the first threshold value and the second threshold value, when the outlet water temperature exceeds the first threshold value and is less than the second threshold value, the water pump is intermittently started and stopped until the first preset condition is met, wherein the first preset condition includes the compressor starting, the outlet water temperature being below a third threshold value smaller than the first threshold value, or receiving a shutdown instruction. By using the above technical means, the outlet water temperature can be reduced by intermittently starting and stopping the water pump. After the outlet water temperature is reduced based on the intermittent start-stop method, the intermittent start-stop processing is exited, and the original preset water pump control strategy of the water pump is recovered for regulation and control. In this way, the technical problem of low operation reliability of the heat pump system caused by directly shutting down the water pump based on the high water temperature during the compressor shutdown period can be avoided. When the outlet water temperature is too high during the compressor shutdown period, the water pump is intermittently started and stopped to reduce the outlet water temperature. After the outlet water temperature is reduced to a preset value (i.e. below the third threshold value), the intermittent start-stop processing is exited, and the original preset water pump control strategy of the water pump is recovered for regulation and control. The outlet water temperature can be reduced without affecting the regulation and control of the preset water pump control strategy, preventing the internal water temperature and pressure of the heat pump system from being too high, thereby improving the operation reliability of the heat pump system.

[0204] On the basis of the above embodiment, Figure 7 A structural schematic diagram of a water pump control device of a heat pump system provided by the embodiment is provided. Referring to Figure 7 The water pump control device of the heat pump system provided by the embodiment specifically comprises: an outlet water temperature detection module 21, an intermittent start-stop processing module 22, and a shutdown control module 23.

[0205] The outlet water temperature detection module 21 is configured to detect the outlet water temperature every preset time when it is confirmed that the current operation mode of the heat pump system is the heating mode and the compressor is closed, and compare the outlet water temperature with the first threshold value and the second threshold value, wherein the first threshold value is less than the second threshold value.

[0206] The intermittent start-stop processing module 22 is configured to perform intermittent start-stop processing on the water pump when the outlet water temperature exceeds the first threshold value and is less than the second threshold value, and to exit the intermittent start-stop processing when a first preset condition is met, the first preset condition including that the compressor is started, the outlet water temperature is below a third threshold value, or a shutdown instruction is received, the third threshold value being less than the first threshold value.

[0207] The shutdown control module 23 is configured to shut down the water pump when the outlet water temperature exceeds the second threshold value.

[0208] In an embodiment, the intermittent start-stop processing module 22 includes a first detection submodule, a first intermittent processing submodule, and a first exit submodule.

[0209] The first detection submodule is configured to continuously detect the outlet water temperature within a first preset time when the outlet water temperature exceeds the first threshold value and is below a fourth threshold value, and to compare the outlet water temperature with the first threshold value and the fourth threshold value, the fourth threshold value being greater than the first threshold value and less than the second threshold value.

[0210] The first intermittent processing submodule is configured to perform first intermittent start-stop processing on the water pump when the outlet water temperature continuously exceeds the first threshold value and is below the fourth threshold value within the first preset time, the first intermittent start-stop processing being to shut down the water pump and maintain for a second preset time, start the water pump and maintain for a third preset time, and repeat the shutting down and starting.

[0211] The first exit submodule is configured to exit the first intermittent start-stop processing when the first preset condition is met.

[0212] In an embodiment, the intermittent start-stop processing module 22 includes a second detection submodule, a second intermittent processing submodule, and a second exit submodule.

[0213] The second detection submodule is configured to continuously detect the outlet water temperature within the first preset time when the outlet water temperature exceeds the fourth threshold value and is below the second threshold value, and to compare the outlet water temperature with the second threshold value and the fourth threshold value, the fourth threshold value being greater than the first threshold value and less than the second threshold value.

[0214] The second intermittent processing submodule is configured to perform second intermittent start-stop processing when the outlet water temperature continuously exceeds the fourth threshold value and is below the second threshold value within the first preset time, the second intermittent start-stop processing being to shut down the water pump and maintain for a fourth preset time, start the water pump and maintain for a fifth preset time, and repeat the shutting down and starting.

[0215] The second exit submodule is configured to exit the second intermittent start-stop processing when the first preset condition is met.

[0216] Further, the water pump control device of the heat pump system further includes an inlet and outlet water detection module and a water temperature comparison module.

[0217] The water inlet and outlet detection module is configured to detect the water inlet temperature and the water outlet temperature every preset time when it is confirmed that the current operation mode of the heat pump system is the cooling mode and the compressor is off;

[0218] The water temperature comparison module is configured to compare the water inlet temperature with a fifth threshold value and a sixth threshold value, and compare the water outlet temperature with a seventh threshold value and an eighth threshold value, the fifth threshold value being less than the sixth threshold value, and the seventh threshold value being less than the eighth threshold value;

[0219] The intermittent start-stop processing module 22 is further configured to perform intermittent start-stop processing on the water pump until the second preset condition is met to exit the intermittent start-stop processing, when the water inlet temperature is greater than the fifth threshold value and less than the sixth threshold value, and the water outlet temperature is greater than the seventh threshold value and less than the eighth threshold value, the second preset condition including that the compressor is started, the water outlet temperature is less than a ninth threshold value, or a shutdown instruction is received, the ninth threshold value being less than the seventh threshold value;

[0220] The shutdown control module 23 is further configured to shut down the water pump when the water inlet temperature is greater than the sixth threshold value and the water outlet temperature is greater than the eighth threshold value.

[0221] In an embodiment, the intermittent start-stop processing module 22 includes a third detection submodule, a third intermittent processing submodule, and a third exit submodule;

[0222] The third detection submodule is configured to continuously detect the water inlet temperature and the water outlet temperature within a first preset time, when the water inlet temperature is greater than the fifth threshold value and less than a tenth threshold value, and the water outlet temperature is greater than the seventh threshold value and less than an eleventh threshold value, the tenth threshold value being greater than the fifth threshold value and less than the sixth threshold value, and the eleventh threshold value being greater than the seventh threshold value and less than the eighth threshold value;

[0223] The third intermittent processing submodule is configured to perform third intermittent start-stop processing on the water pump, when the water inlet temperature is greater than the fifth threshold value and less than the tenth threshold value, and the water outlet temperature is greater than the seventh threshold value and less than the eleventh threshold value, within the first preset time, the third intermittent start-stop processing being to shut down the water pump and maintain for a sixth preset time, start the water pump and maintain for a seventh preset time, and repeat the shutting down and starting.

[0224] The third exit submodule is configured to exit the third intermittent start-stop processing until the second preset condition is met.

[0225] In an embodiment, the intermittent start-stop processing module 22 includes a fourth detection submodule, a fourth intermittent processing submodule, and a fourth exit submodule;

[0226] the fourth detection submodule is configured to continuously detect the inlet water temperature and the outlet water temperature within a first preset time when the inlet water temperature exceeds a tenth threshold value and is below a sixth threshold value, and the outlet water temperature exceeds an eleventh threshold value and is below a seventh threshold value, the tenth threshold value is greater than the fifth threshold value and less than the sixth threshold value, and the eleventh threshold value is greater than the seventh threshold value and less than the eighth threshold value;

[0227] the fourth intermittent processing submodule is configured to perform fourth intermittent start-stop processing on the water pump when the inlet water temperature exceeds the tenth threshold value and is below the sixth threshold value, and the outlet water temperature exceeds the eleventh threshold value and is below the seventh threshold value, for a first preset time, the fourth intermittent start-stop processing comprises: turning off the water pump and maintaining for an eighth preset time, turning on the water pump and maintaining for a ninth preset time, and repeatedly performing the turning off and the turning on;

[0228] the fourth exit submodule is configured to exit the fourth intermittent start-stop processing until a second preset condition is met.

[0229] In an embodiment, the water pump control device of the heat pump system further comprises a preset strategy acquisition module and a preset strategy recovery module.

[0230] The preset strategy acquisition module is configured to acquire a preset water pump control strategy in a current operation mode.

[0231] The preset strategy recovery module is configured to control the operation of the water pump according to the preset water pump control strategy.

[0232] The water pump control device of the heat pump system provided by the embodiments of the present application can be used to execute the water pump control method of the heat pump system provided by the above embodiments, and has corresponding functions and beneficial effects.

[0233] The embodiments of the present application provide a water pump control device of a heat pump system, referring to Figure 8 The water pump control device of the heat pump system comprises a processor 31, a memory 32, a communication module 33, an input device 34, and an output device 35. The number of processors in the water pump control device of the heat pump system can be one or more, and the number of memories in the water pump control device of the heat pump system can be one or more. The processor, the memory, the communication module, the input device, and the output device of the water pump control device of the heat pump system can be connected through a bus or other means.

[0234] The memory 32, as a computer readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions / modules of the water pump control method of the heat pump system according to any of the embodiments of the present application (for example, the outlet water temperature detection module, the intermittent start-stop processing module and the shutdown control module in the water pump control device of the heat pump system). The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; and the data storage area can store data created according to the use of the device and the like. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device or other non-volatile solid-state memory device. In some examples, the memory can further include a memory remotely arranged with respect to the processor, which can be connected to the device through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0235] The communication module 33 is used for data transmission.

[0236] The processor 31 executes various function applications and data processing of the device by running the software programs, instructions and modules stored in the memory, that is, implements the water pump control method of the heat pump system as described above.

[0237] The input device 34 can be used to receive input digital or character information, and generate key signal input related to user settings and function control of the device. The output device 35 can include a display device such as a display screen.

[0238] The water pump control device of the heat pump system provided above can be used to execute the water pump control method of the heat pump system provided in the above embodiments, and has corresponding functions and advantages.

[0239] The embodiments of the present application also provide a storage medium storing computer executable instructions, which, when executed by a computer processor, are used to execute a water pump control method of a heat pump system, the water pump control method of the heat pump system comprising: detecting an outlet water temperature every preset time when it is confirmed that a current operation mode of the heat pump system is a heating mode and a compressor is off, and comparing the outlet water temperature with a first threshold value and a second threshold value, the first threshold value being less than the second threshold value; performing intermittent start-stop processing on a water pump until the first preset condition is met to exit the intermittent start-stop processing when the outlet water temperature exceeds the first threshold value and is less than the second threshold value, the first preset condition including that the compressor is started, the outlet water temperature is below a third threshold value or a shutdown instruction is received, the third threshold value being less than the first threshold value; and shutting down the water pump when the outlet water temperature exceeds the second threshold value.

[0240] Storage medium - any type of memory device or storage device. The term "storage medium" is intended to include an installation medium, e.g., a CD-ROM, floppy disks, or tape apparatus; computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; or a non-volatile memory such as a magnetic medium (e.g., a hard drive or optical storage); registers or other similar types of memory elements, etc. The memory medium can also include other types of storage medium or combinations thereof. In addition, the memory medium can reside in a first computer system's main memory, or in a second different computer system's memory, which second computer system can provide the first computer system with an instruction for execution. The term "memory medium" can also include two or more memory mediums that reside in different locations, e.g., in different computer systems that are connected over a network such as the Internet. The memory medium can store program instructions that can be executed by one or more processors (e.g., to implement a computer program).

[0241] Of course, the storage medium storing computer executable instructions provided by the embodiments of the present application is not limited to the water pump control method of the heat pump system as described above, but can also execute the related operations in the water pump control method of the heat pump system provided by any of the embodiments of the present application.

[0242] The water pump control device of the heat pump system, the storage medium and the water pump control equipment of the heat pump system provided in the above embodiments can execute the water pump control method of the heat pump system provided by any of the embodiments of the present application, and the technical details not described in detail in the above embodiments can refer to the water pump control method of the heat pump system provided by any of the embodiments of the present application.

[0243] The above is only the preferred embodiments of the present application and the technical principles applied. The present application is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and replacements made by those skilled in the art will not deviate from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without deviating from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A water pump control method for a heat pump system, characterized in that, include: When it is confirmed that the current operating mode of the heat pump system is heating mode and the compressor is off, the outlet water temperature is detected at preset intervals, and the outlet water temperature is compared with a first threshold and a second threshold. When the outlet water temperature is too high, the water pump is intermittently started and stopped to reduce the outlet water temperature. The first threshold is less than the second threshold. When the outlet water temperature exceeds the first threshold and is less than the second threshold, the water pump is intermittently started and stopped until a first preset condition is met and the intermittent start and stop process is terminated. The first preset condition includes compressor start-up, outlet water temperature below a third threshold, or receiving a shutdown command. The third threshold is less than the first threshold. When the outlet water temperature exceeds the second threshold, the water pump is turned off; Obtain the preset water pump control strategy under the current operating mode. After exiting the intermittent start-stop process, control the water pump to restore its operation to the state before the intermittent start-stop process according to the preset water pump control strategy. Wherein, the step of intermittently starting and stopping the water pump when the outlet water temperature exceeds the first threshold and is less than the second threshold, until the intermittent start-stop process is exited when the first preset condition is met, includes: When the outlet water temperature exceeds the first threshold and is below the fourth threshold, the outlet water temperature is continuously detected for a first preset time, and the outlet water temperature is compared with the first threshold and the fourth threshold, wherein the fourth threshold is greater than the first threshold and less than the second threshold. If the outlet water temperature continuously exceeds the first threshold and is below the fourth threshold within the first preset time, then the water pump is subjected to a first intermittent start-stop process. The first intermittent start-stop process is to turn off the water pump and maintain it for a second preset time, turn on the water pump and maintain it for a third preset time, and repeat the turning off and turning on processes. The process continues until the first preset condition is met, at which point the first intermittent start-stop process is exited. When the outlet water temperature exceeds the fourth threshold and is below the second threshold, the outlet water temperature is continuously detected for a first preset time, and the outlet water temperature is compared with the second threshold and the fourth threshold. If the outlet water temperature continuously exceeds the fourth threshold and is below the second threshold within the first preset time, then a second intermittent start-stop process is performed. The second intermittent start-stop process is to turn off the water pump and maintain it for the fourth preset time, turn on the water pump and maintain it for the fifth preset time, and repeat the turning off and turning on processes. The fourth preset time is greater than the second preset time. The process continues until the first preset condition is met, at which point the second intermittent start-stop process is exited.

2. The method according to claim 1, characterized in that, The method further includes: When it is confirmed that the current operating mode of the heat pump system is cooling mode and the compressor is off, the outlet water temperature and inlet water temperature are detected at preset intervals. The inlet water temperature is compared with the fifth threshold and the sixth threshold, and the outlet water temperature is compared with the seventh threshold and the eighth threshold, wherein the fifth threshold is less than the sixth threshold, and the seventh threshold is less than the eighth threshold; When the inlet water temperature exceeds the fifth threshold and is below the sixth threshold, and the outlet water temperature exceeds the seventh threshold and is below the eighth threshold, the water pump is intermittently started and stopped until a second preset condition is met and the intermittent start and stop process is terminated. The second preset condition includes compressor start-up, outlet water temperature below the ninth threshold, or receiving a shutdown command. The ninth threshold is less than the seventh threshold. When the inlet water temperature exceeds the sixth threshold and the outlet water temperature exceeds the eighth threshold, the water pump is shut off.

3. The method according to claim 2, characterized in that, The step of intermittently starting and stopping the water pump when the inlet water temperature exceeds the fifth threshold and is below the sixth threshold, and the outlet water temperature exceeds the seventh threshold and is below the eighth threshold, until the intermittent start-stop process is exited when the second preset condition is met, includes: When the inlet water temperature exceeds the fifth threshold but is below the tenth threshold, and the outlet water temperature exceeds the seventh threshold but is below the eleventh threshold, the inlet water temperature and outlet water temperature are continuously detected for a first preset time. The tenth threshold is greater than the fifth threshold and less than the sixth threshold, and the eleventh threshold is greater than the seventh threshold and less than the eighth threshold. If the inlet water temperature continuously exceeds the fifth threshold and is below the tenth threshold, and the outlet water temperature exceeds the seventh threshold and is below the eleventh threshold within the first preset time, then the water pump is subjected to a third intermittent start-stop process. The third intermittent start-stop process is to shut down the water pump and maintain it for a sixth preset time, turn on the water pump and maintain it for a seventh preset time, and repeat the shutdown and startup processes. The process continues until the second preset condition is met, at which point the third intermittent start-stop process is exited.

4. The method according to claim 2, characterized in that, The step of intermittently starting and stopping the water pump when the inlet water temperature exceeds the fifth threshold and is below the sixth threshold, and the outlet water temperature exceeds the seventh threshold and is below the eighth threshold, until the intermittent start-stop process is exited when the second preset condition is met, includes: When the inlet water temperature exceeds the tenth threshold and is below the sixth threshold, and the outlet water temperature exceeds the eleventh threshold and is below the eighth threshold, the inlet water temperature and outlet water temperature are continuously detected for a first preset time period, wherein the tenth threshold is greater than the fifth threshold and less than the sixth threshold, and the eleventh threshold is greater than the seventh threshold and less than the eighth threshold. If the inlet water temperature continuously exceeds the tenth threshold and is below the sixth threshold within the first preset time, and the outlet water temperature exceeds the eleventh threshold and is below the eighth threshold, then the water pump is subjected to a fourth intermittent start-stop process. The fourth intermittent start-stop process is to shut down the water pump and maintain it for an eighth preset time, turn on the water pump and maintain it for a ninth preset time, and repeat the shutdown and startup processes. The process continues until the second preset condition is met, at which point the fourth intermittent start-stop process is exited.

5. A water pump control device for a heat pump system, characterized in that, include: The outlet water temperature detection module is used to detect the outlet water temperature at preset intervals when it is confirmed that the current operating mode of the heat pump system is heating mode and the compressor is off, and compare the outlet water temperature with a first threshold and a second threshold, so as to reduce the outlet water temperature by intermittently starting and stopping the water pump when the outlet water temperature is too high, wherein the first threshold is less than the second threshold. An intermittent start-stop processing module is used to perform intermittent start-stop processing on the water pump when the outlet water temperature exceeds the first threshold and is less than the second threshold, until the intermittent start-stop processing is exited when a first preset condition is met. The first preset condition includes compressor start-up, outlet water temperature below a third threshold, or receiving a shutdown command. The third threshold is less than the first threshold. The shutdown control module is used to shut down the water pump when the outlet water temperature exceeds the second threshold. The preset strategy acquisition module is used to acquire the preset water pump control strategy under the current operating mode; The preset strategy recovery module is used to control the water pump to return to the state before the intermittent start-stop process after exiting the intermittent start-stop process, according to the preset water pump control strategy. The intermittent start / stop processing module includes: The first detection submodule is used to continuously detect the water temperature within a first preset time when the water temperature exceeds the first threshold and is below the fourth threshold, and compare the water temperature with the first threshold and the fourth threshold, wherein the fourth threshold is greater than the first threshold and less than the second threshold. The first intermittent processing submodule is used to perform a first intermittent start-stop process on the water pump if the outlet water temperature continuously exceeds the first threshold and is below the fourth threshold within a first preset time. The first intermittent start-stop process is to shut down the water pump and maintain it for a second preset time, turn on the water pump and maintain it for a third preset time, and repeat the shutdown and start-up process. The first exit submodule is used to exit the first intermittent start-stop process until the first preset condition is met. The second detection submodule is used to continuously detect the water temperature within a first preset time when the water temperature exceeds the fourth threshold and is below the second threshold, and compare the water temperature with the second threshold and the fourth threshold. The second intermittent processing submodule is used to continuously meet the condition that the outlet water temperature exceeds the fourth threshold and is below the second threshold within a first preset time. If this condition is met, the second intermittent start-stop process is performed. The second intermittent start-stop process is to shut down the water pump and maintain it for a fourth preset time, turn on the water pump and maintain it for a fifth preset time, and repeat the shutdown and start-up process. The fourth preset time is greater than the second preset time. The second exit submodule is used to exit the second intermittent start-stop process until the first preset condition is met.

6. A water pump control device for a heat pump system, characterized in that, include: Memory and one or more processors; The memory is used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 1-4.

7. A storage medium for storing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a processor, are used to perform the method as described in any one of claims 1-4.

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