Heat pump water heater control method and device, heat pump water heater and storage medium

Abstract

The invention relates to the technical field of heat pump water heaters, in particular to a heat pump water heater control method and device, a heat pump water heater and a storage medium. When the heat pump water heater operates in a heat storage mode, the environment temperature of the area where a heat pump host is located and the heat storage module temperature of a heat storage module are obtained; when the temperature of the heat storage module is smaller than the set module temperature and the environment temperature is within the heat pump operation interval, the target water outlet temperature of the heat pump water heater is determined; the temperature change value of the heat pump water heater is obtained, the operation state of the electric auxiliary heating device is adjusted according to the temperature change value, the operation state of a heat pump main machine is determined firstly, and whether the operation state of the electric auxiliary heating device needs to be adjusted or not is judged according to the temperature change values obtained in the different operation states, so that when the heating capacity of the heat pump main machine is insufficient, the electric auxiliary heating device is adjusted. The heat storage process can be finely controlled by starting the electric auxiliary heating device, so that the control process is more stable and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump water heaters, and particularly to a control method and device for a heat pump water heater, a heat pump water heater, and a storage medium. Background Art

[0002] Conventional heat pump water heaters generally continuously heat the water in the water tank through the heat pump main unit, so that the water in the water tank maintains a relatively high water temperature for users to use. During this process, the heat storage capacity of the heat storage water tank will be affected by the surrounding environment, resulting in the hot water temperature being restricted and unable to reach the hot water temperature set by the user, which affects the user experience.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a control method and device for a heat pump water heater, a heat pump water heater, and a storage medium, aiming to solve the technical problem of insufficient heating capacity of the existing heat pump water heater.

[0005] To achieve the above object, the present invention provides a control method for a heat pump water heater. The control method for a heat pump water heater is applied to a heat pump water heater. The heat pump water heater includes a heat pump main unit, a hydraulic module, and a heat storage module. The heat pump main unit includes a compressor, a reversing device, an outdoor heat exchanger, an outdoor fan, and an expansion valve. The hydraulic module includes an electric auxiliary heating device, a water pump, and a water-fluorine heat exchanger. The heat pump main unit is connected to the hydraulic module through the water-fluorine heat exchanger. The heat storage module includes a first heat exchange water path and a second heat exchange water path. The heat storage module is connected to the hydraulic module through the first heat exchange water path. The second heat exchange water path is connected to the user water pipeline. The first heat exchange water path is used to store heat for the phase change material in the heat storage module. The second heat exchange water path is used to exchange heat with the first heat exchange water path through the phase change material.

[0006] The method includes the following steps:

[0007] When the heat pump water heater operates in the heat storage mode, obtain the ambient temperature of the area where the heat pump main unit is located and the temperature of the heat storage module of the heat storage module.

[0008] When the temperature of the heat storage module is less than the set module temperature and the ambient temperature is within the heat pump operating range, determine the target outlet water temperature of the heat pump water heater.

[0009] When the heat pump water heater operates at the target outlet water temperature, obtain the temperature change value of the heat pump water heater, and adjust the operating state of the electric auxiliary heating device according to the temperature change value.

[0010] Optionally, determining the target outlet water temperature of the heat pump water heater includes:

[0011] Determining the maximum outlet water temperature at which the heat pump can operate corresponding to the environmental temperature and the set outlet water temperature of the hydraulic module;

[0012] Determining the target outlet water temperature of the heat pump water heater according to the minimum value of the temperature between the maximum outlet water temperature at which the heat pump can operate and the target outlet water temperature.

[0013] Optionally, the temperature change value includes the outlet water temperature change value of the hydraulic module corresponding to the first operating state. When the target outlet water temperature is less than or equal to the maximum outlet water temperature at which the heat pump can operate, the operating state of the heat pump main unit is controlled according to the target outlet water temperature;

[0014] When the heat pump water heater operates at the target outlet water temperature, obtaining the temperature change value of the heat pump water heater and adjusting the operating state of the electric auxiliary heating device according to the temperature change value includes:

[0015] When the environmental temperature is less than the first temperature threshold, obtaining the current heat storage module temperature of the heat storage module of the heat pump water heater in the first operating state;

[0016] Adjusting the operating state of the electric auxiliary heating device according to the outlet water temperature change value and the current heat storage module temperature.

[0017] Optionally, adjusting the operating state of the electric auxiliary heating device according to the outlet water temperature change value and the current heat storage module temperature includes:

[0018] When the current heat storage module temperature is less than the set module temperature and the outlet water temperature change value is less than or equal to the second temperature threshold, starting the electric auxiliary heating device.

[0019] Optionally, the temperature change value further includes the heat storage module temperature change value of the heat storage module corresponding to the second operating state. When the target outlet water temperature is greater than the maximum outlet water temperature at which the heat pump can operate, the operating state of the heat pump main unit is controlled according to the maximum outlet water temperature at which the heat pump can operate;

[0020] When the heat pump water heater operates at the target outlet water temperature, obtaining the temperature change value of the heat pump water heater and adjusting the operating state of the electric auxiliary heating device according to the temperature change value includes:

[0021] Obtaining the continuous temperature - reaching and shutdown times of the heat pump main unit and the current heat storage module temperature of the heat pump water heater in the second operating state;

[0022] Adjust the operating state of the electric auxiliary heating device according to the continuous temperature - reaching and shutdown times, the temperature change value of the heat storage module, and the current temperature of the heat storage module.

[0023] Optionally, adjusting the operating state of the electric auxiliary heating device according to the continuous temperature - reaching and shutdown times, the temperature change value of the heat storage module, and the current temperature of the heat storage module includes:

[0024] When the continuous temperature - reaching and shutdown times are greater than or equal to a preset threshold, the temperature change value of the heat storage module is less than or equal to a third temperature threshold, and the current temperature of the heat storage module is less than the set module temperature, start the electric auxiliary heating device.

[0025] Optionally, after obtaining the ambient temperature of the area where the heat pump host is located and the temperature of the heat storage module of the heat storage module, it further includes:

[0026] When the ambient temperature is not within the heat pump operating range, start the electric auxiliary heating device.

[0027] In addition, to achieve the above object, the present invention also proposes a control device for a heat pump water heater, and the control device for the heat pump water heater includes:

[0028] An acquisition module, configured to acquire the ambient temperature of the area where the heat pump host is located and the temperature of the heat storage module of the heat storage module when the heat pump water heater operates in a heat storage mode;

[0029] A determination module, configured to determine the target outlet water temperature of the heat pump water heater when the temperature of the heat storage module is less than the set module temperature and the ambient temperature is within the heat pump operating range;

[0030] An adjustment module, configured to acquire the temperature change value of the heat pump water heater when the heat pump water heater operates at the target outlet water temperature, and adjust the operating state of the electric auxiliary heating device according to the temperature change value.

[0031] In addition, to achieve the above object, the present invention also proposes a control device for a heat pump water heater, and the control device for the heat pump water heater includes: a memory, a processor, and a heat pump water heater control program stored on the memory and executable on the processor, and the heat pump water heater control program is configured to implement the steps of the heat pump water heater control method as described above.

[0032] In addition, to achieve the above object, the present invention also proposes a storage medium, on which a heat pump water heater control program is stored, and when the heat pump water heater control program is executed by a processor, it implements the steps of the heat pump water heater control method as described above.

[0033] When the heat pump water heater operates in the heat storage mode, the present invention obtains the ambient temperature of the area where the heat pump host is located and the heat storage module temperature of the heat storage module; when the heat storage module temperature is less than the set module temperature and the ambient temperature is within the heat pump operation range, the target outlet water temperature of the heat pump water heater is determined; when the heat pump water heater operates at the target outlet water temperature, the temperature change value of the heat pump water heater is obtained, and the operation state of the electric auxiliary heating device is adjusted according to the temperature change value. First, the operation state of the heat pump host is determined, and whether to adjust the operation state of the electric auxiliary heating device is judged according to the temperature change values obtained under different operation states, so that when the heating capacity of the heat pump host is insufficient, the electric auxiliary heating device can be started to finely control the heat storage process, making the control process more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of a heat pump water heater control device in the hardware operating environment related to the embodiment solution of the present invention;

[0035] Figure 2 is a schematic flowchart of the first embodiment of the heat pump water heater control method of the present invention;

[0036] Figure 3 is a schematic structural diagram of a phase change water heater in an embodiment of the heat pump water heater control method of the present invention;

[0037] Figure 4 is a schematic flowchart of the second embodiment of the heat pump water heater control method of the present invention;

[0038] Figure 5 is a schematic flowchart of the third embodiment of the heat pump water heater control method of the present invention;

[0039] Figure 6 is a schematic block diagram of the first embodiment of the heat pump water heater control device of the present invention.

[0040] DESCRIPTION OF REFERENCE NUMERALS:

[0041] Label Name Label Name 10 Heat pump main unit 17 Water-fluorine heat exchanger 20 Hydraulic module 21 Electric auxiliary heating device 30 Heat storage module 22 Water flow switch 11 Gas-liquid separator 23 Water pump 12 Compressor 24 Expansion tank 13 Reversing device 25 First sensor 14 Outdoor heat exchanger 31 First heat exchange water path 15 Outdoor fan 32 Second heat exchange water path 16 Expansion valve 33 Second sensor

[0042] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] Refer to Figure 1 , Figure 1 is a schematic structural diagram of a heat pump water heater control device in the hardware operating environment related to the embodiment solution of the present invention.

[0045] As Figure 1 shown, the heat pump water heater control device may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard. Optionally, the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed Random Access Memory (RAM) or a stable Non-Volatile Memory (NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0046] Those skilled in the art can understand that Figure 1 the structure shown in

[0047] As Figure 1 shown, the memory 1005, as a storage medium, may include an operating system, a network communication module, a user interface module, and a heat pump water heater control program.

[0048] In Figure 1 the heat pump water heater control device shown, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the heat pump water heater control device of the present invention may be arranged in the heat pump water heater control device. The heat pump water heater control device calls the heat pump water heater control program stored in the memory 1005 through the processor 1001 and executes the heat pump water heater control method provided by the embodiments of the present invention.

[0049] The embodiments of the present invention provide a heat pump water heater control method. Referring to Figure 2 , Figure 2 is a schematic flowchart of a first embodiment of a heat pump water heater control method of the present invention.

[0050] In this embodiment, the heat pump water heater control method includes the following steps:

[0051] Step S10: When the heat pump water heater operates in the heat storage mode, obtain the ambient temperature of the area where the heat pump main unit is located and the heat storage module temperature of the heat storage module.

[0052] It should be noted that the execution subject of the method in this embodiment can be a device with data acquisition or data processing functions, such as: the control device of the heat pump water heater or the heat pump water heater unit equipped with a phase change heat pump main unit, or other devices that can achieve the same or similar functions. This embodiment does not make specific limitations. In this embodiment and the following embodiments, the heat pump water heater will be used as an example for illustration.

[0053] It should be understood that most heat pump water heaters on the market are storage type, and the heat pump main unit heats the water in the water tank. The water stored in the water tank is in a "stagnant water" state. To overcome this drawback, a new phase change heat storage type heat pump water heater in this embodiment fills the phase change heat storage material between the gaps of the heat exchange tubes of the heat storage module of the heat pump water heater. Heat exchange is carried out between the hot water in the tube and the phase change heat storage material to complete the phase change energy storage of the phase change heat storage material, and heat is released when using hot water to meet the user's demand for using hot water. However, during the process of charging and energy storage, affected by the ambient temperature, the heat pump outlet water temperature is limited, and only relying on the heat pump to charge may not reach the temperature required by the heat storage water tank, which will affect the user experience.

[0054] To solve the above problems, this embodiment proposes a phase change heat pump water heater. The heat pump water heater mentioned in this embodiment and the following embodiments refers to the phase change heat pump water heater as shown in Figure 3 The phase change heat pump water heater 100 includes a heat pump main unit 10, a hydraulic module 20, and a heat storage module 30. The heat pump main unit includes a gas-liquid separator 11, a compressor 12, a reversing device 13, an outdoor heat exchanger 14, an outdoor fan 15, and an expansion valve 16. The hydraulic module 20 includes an electric auxiliary heating device 21, a water flow switch 22, a water-fluorine heat exchanger 17, a water pump 23, and an expansion tank 24. The hydraulic module is also provided with a first sensor 25, and the heat storage module 30 is also provided with a second sensor 33. The first sensor 25 is used to collect the outlet water temperature, and the second sensor 33 is used to collect the temperature of the heat storage module. The heat pump main unit is connected to the hydraulic module through the water-fluorine heat exchanger 17.

[0055] Among them, the outdoor fan 15 is used to reduce the coil temperature of the outdoor heat exchanger 14, thereby accelerating the heat exchange between the heat exchanger and the external environment, and further achieving the control of the heating output capacity of the heat pump main unit 10. The greater the rotation speed of the outdoor fan 15, the greater the heating output of the heat pump main unit 10, and the smaller the rotation speed of the outdoor fan 14, the smaller the heating output capacity of the heat pump main unit 10.

[0056] Among them, the heat storage module includes a first heat exchange water circuit 31 and a second heat exchange water circuit 32. The first heat exchange water circuit 31 and the second heat exchange water circuit 32 together form a heat storage module heat exchanger. The heat storage module is connected to the hydraulic module 20 through the first heat exchange water circuit 31, and the second heat exchange water circuit 32 is connected to the user water pipeline. The first heat exchange water circuit 31 is used for storing heat in the phase change material in the heat storage module, and the second heat exchange water circuit 32 is used for heat exchange with the first heat exchange water circuit through the phase change material.

[0057] During the operation of the heat pump main unit in the heat storage mode, the compressor 12 outputs high-temperature and high-pressure refrigerant to the reversing device 13. Through the selected terminal D-C of the reversing device 13, the high-temperature and high-pressure refrigerant exchanges heat through the water-fluorine heat exchanger 17. At this time, the water-fluorine heat exchanger 17 is used as a condenser. After the refrigerant exchanges heat through the water-fluorine heat exchanger 17, it sequentially passes through the expansion valve 16, the outdoor heat exchanger 14, the selected terminal E-S of the reversing device 13, and the gas-liquid separator 11 and returns to the compressor. During this process, since the first side of the water-fluorine heat exchanger 17 is connected to the heat pump main unit and the second side is connected to the hydraulic module, when there is high-temperature and high-pressure refrigerant on the first side of the water-fluorine heat exchanger, due to the temperature difference between the two sides of the water-fluorine heat exchanger, the refrigerant on the first side will heat the water flowing through the second side of the water-fluorine heat exchanger, thereby realizing the heating of the water in the pipeline in the hydraulic module.

[0058] In the hydraulic module, water is sent to the water-fluorine heat exchanger 17 by a water pump, so that the water in the pipeline is heated through the water-fluorine heat exchanger 17, and then sequentially passes through the electric auxiliary heating device 21 and the water flow switch 22 and flows through the first heat exchange water circuit 31 of the heat storage module, realizing heat exchange with the phase change material filled in the heat storage module to achieve the purpose of heat storage, and finally returning to the expansion tank 24 or the water pump 23 to participate in the next water-fluorine heat exchange.

[0059] In the heat storage module, tap water enters the second heat exchange pipeline 32 of the heat storage module through the one-way valve in the user water pipeline. The second heat exchange pipeline 32 exchanges heat with the phase change material filled in the heat storage module to achieve the purpose of heating the user water.

[0060] In this embodiment, the heat pump main unit and the hydraulic module can be integrated into one module, that is, the hydraulic part is included in the heat pump main unit, or they can be separately and independently installed. The heat storage module can be a single heat storage module, or the heat storage module and the hydraulic part together form a heat storage water tank.

[0061] The heat storage module heat exchanger can be composed of a finned-tube heat exchanger and a phase change material filled in its gaps. There are two water circuits in the finned-tube heat exchanger. One is connected to the hydraulic module, and the hot water provided by the hydraulic module pipeline flows through the heat storage module heat exchanger or the coil of the heat storage module, exchanges heat with the phase change material, and realizes the heat charging and energy storage process of the heat storage module. The other is connected to the user's water pipeline. When the user uses hot water, tap water is replenished. The external water body exchanges heat with the phase change material through the second heat exchange water circuit in the heat storage module heat exchanger, realizes the heat release of the phase change material, and reaches the process of raising the temperature of the user's water, meets the user's demand for using hot water, and can mix water through the bypass tap water branch to control the water outlet temperature and meet the user's demand for the water temperature of the used water.

[0062] It can be understood that since the heat storage module is composed of two heat exchange water circuits, when obtaining the temperature of the heat storage module of the heat storage module, the temperature of the heat storage module of the heat storage module can be the average temperature of the two heat exchange water circuits of the heat storage module, or the temperature of the phase change material filled in the heat storage water tank. This embodiment does not make specific restrictions on this.

[0063] Step S20: When the temperature of the heat storage module is less than the set module temperature and the ambient temperature is within the heat pump operation range, determine the target outlet temperature of the heat pump water heater.

[0064] It should be noted that during the heat exchange process, the temperature of the heat storage water tank may fluctuate due to the influence of the surrounding ambient temperature. To reduce interference, in this embodiment, the set module temperature can also be set as the difference between the set temperature of the heat storage water tank and the preset dead band. Among them, the value range of the preset dead band is 1-10°C. In this embodiment, the value of the preset dead band is taken as 2°C as an example.

[0065] The heat pump operation range refers to the temperature under normal circumstances. In this embodiment, the heat pump operation range can be set as -40°C to 60°C. This embodiment does not make specific restrictions on this.

[0066] In specific implementation, judging that the temperature of the heat storage module is less than the set module temperature and judging that the ambient temperature is within the heat pump operation range is to ensure that the heat pump water heater has a heating demand and the heat pump main unit can operate normally.

[0067] In this embodiment, there are two operating states of the heat pump main unit. The first operating state is that the heat pump main unit operates at the target outlet temperature set by the user or the target outlet temperature calculated according to the heat storage demand. The second operating state is that the heat pump main unit operates at the maximum outlet temperature that the heat pump can operate.

[0068] Furthermore, in order to accurately determine the operating state of the heat pump main unit and improve the control efficiency of the heat pump water heater, the determining the target outlet temperature of the heat pump water heater includes:

[0069] Determine the maximum outlet water temperature at which the heat pump can operate corresponding to the ambient temperature and the set outlet water temperature of the hydraulic module;

[0070] Determine the target outlet water temperature of the heat pump water heater according to the minimum value of the maximum outlet water temperature at which the heat pump can operate and the target outlet water temperature.

[0071] In specific implementation, affected by the operating range of the compressor, the ambient temperature and the outlet water temperature will affect the reliable operation of the heat pump. If the outlet water temperature is too high, the exhaust pressure of the compressor is too high or the compression ratio exceeds the operable range, the compressor will not operate normally. Therefore, by querying the maximum outlet water temperature at which the heat pump can operate corresponding to the ambient temperature, and comparing the maximum outlet water temperature at which the heat pump can operate with the target outlet water temperature set by the user, take the smaller value of the maximum outlet water temperature at which the heat pump can operate and the target outlet water temperature as the operating state of the heat pump main unit, and charge the heat storage module in a way with less energy consumption.

[0072] For example: when the target outlet water temperature TWB > the maximum outlet water temperature TWmax at which the heat pump can operate, the heat pump main unit operates according to the maximum outlet water temperature TWmax at which the heat pump can operate; when the target outlet water temperature TWB ≤ the maximum outlet water temperature TWmax at which the heat pump can operate, the heat pump main unit operates according to the target outlet water temperature TWB.

[0073] Further, after obtaining the ambient temperature of the area where the heat pump main unit is located and the heat storage module temperature of the heat storage module, it further includes:

[0074] When the ambient temperature is not within the heat pump operating range, start the electric auxiliary heating device.

[0075] In specific implementation, if the heat pump main unit does not meet the normal operating conditions, in order to ensure the normal water use of the user, in this embodiment, the electric auxiliary heating device can be started to heat the water body in the hydraulic module pipeline, so as to realize the heat storage of the phase change material.

[0076] Step S30: When the heat pump water heater operates at the target outlet water temperature, obtain the temperature change value of the heat pump water heater, and adjust the operating state of the electric auxiliary heating device according to the temperature change value.

[0077] It should be noted that the temperature change values obtained in different operating states in this embodiment are different. Among them, when the target outlet water temperature is less than or equal to the maximum outlet water temperature at which the heat pump can operate, the outlet water temperature change value of the hydraulic module within a preset time period is obtained under the condition of controlling the operating state of the heat pump main unit according to the target outlet water temperature; when the target outlet water temperature is greater than the maximum outlet water temperature at which the heat pump can operate, the heat storage module temperature change value of the heat storage module within a preset time period is obtained under the condition of controlling the operating state of the heat pump main unit according to the maximum outlet water temperature at which the heat pump can operate.

[0078] The electric auxiliary heating device is controlled according to the temperature change values corresponding to different operating states, which reduces the operating energy consumption of the heat pump water heater during heating without affecting the normal use of hot water by users.

[0079] In this embodiment, when the heat pump water heater operates in the heat storage mode, the ambient temperature of the area where the heat pump main unit is located and the heat storage module temperature of the heat storage module are obtained; when the heat storage module temperature is less than the set module temperature and the ambient temperature is within the heat pump operating range, the target outlet water temperature of the heat pump water heater is determined; when the heat pump water heater operates at the target outlet water temperature, the temperature change value of the heat pump water heater is obtained, and the operating state of the electric auxiliary heating device is adjusted according to the temperature change value. First, the operating state of the heat pump main unit is determined, and whether the operating state of the electric auxiliary heating device needs to be adjusted is judged according to the temperature change values obtained under different operating states, so that when the heating capacity of the heat pump main unit is insufficient, the electric auxiliary heating device can be started to finely control the heat storage process, making the control process more stable and reliable.

[0080] Reference Figure 4 , Figure 4 is a schematic flowchart of the second embodiment of a control method for a heat pump water heater according to the present invention.

[0081] Based on the above first embodiment, in this embodiment, step S30 includes:

[0082] Step S301: When the ambient temperature is less than the first temperature threshold, obtain the current heat storage module temperature of the heat storage module of the heat pump water heater in the first operating state.

[0083] It should be noted that the first operating state refers to the operating state of controlling the heat pump main unit according to the target outlet water temperature when the target outlet water temperature is less than or equal to the maximum outlet water temperature at which the heat pump can operate; when the heat pump main unit operates in the first operating state, by judging the change value of the outlet water temperature, it is possible to effectively judge whether the heating output of the heat pump water heater can meet the heating energy demand of users.

[0084] Among them, the temperature value range of the first temperature threshold is -35°C to 10°C, preferably -10°C.

[0085] Step S302: Adjust the operating state of the electric auxiliary heating device according to the change value of the outlet water temperature and the current temperature of the heat storage module.

[0086] It can be understood that if the ambient temperature is relatively low, it is very likely that the actual outlet water temperature of the hydraulic module cannot meet the heat storage requirement. At this time, obtain the current outlet water temperature and the current temperature of the heat storage module after the heat pump main unit operates continuously for the first duration in the first operating state, ensuring that the collected temperatures of the heat storage module and the outlet water are data when the heat pump water heater operates stably, and there is no large temperature fluctuation before and after, making the control process more accurate. The value range of the first duration is 10 min to 120 min, preferably 60 min.

[0087] After the heat pump water heater operates stably, obtain the change value of the outlet water temperature within the second duration to facilitate judging whether to start the electric auxiliary heating device to improve the heating output of the water heater. The value range of the second duration is 0 to 120 min, preferably 30 min.

[0088] Further, the adjusting the operating state of the electric auxiliary heating device according to the change value of the outlet water temperature and the current temperature of the heat storage module includes:

[0089] When the current temperature of the heat storage module is less than the set module temperature and the change value of the outlet water temperature is less than or equal to the second temperature threshold, start the electric auxiliary heating device.

[0090] It can be understood that the value range of the second temperature threshold is 0 to 10 °C, preferably 1 °C.

[0091] In a specific implementation, taking the target outlet water temperature TWB set by the user as 55 °C, the maximum outlet water temperature that the heat pump of the heat pump main unit can operate as 60 °C, and the set temperature TSpcm of the heat storage water tank as 65 °C as an example, in this case, the heat pump main unit operates at the target outlet water temperature of 55 °C. After the compressor operates continuously for 60 minutes, start to obtain the change value of the outlet water temperature TW. When the temperature rise value of the outlet water temperature TW ≤ 1 °C after continuous calculation for 30 minutes and the temperature Tpcm of the heat storage module < the set value of 65 °C, it indicates that the heat output of the heat pump is insufficient and there is still a heating requirement. At this time, start the electric auxiliary heating operation to improve the heating output of the heat pump water heater until the temperature Tpcm of the heat storage module ≥ the set temperature TSpcm of the heat storage module, and the heat storage water tank stops when the temperature reaches the set value.

[0092] In this embodiment, by detecting and judging which temperature range the ambient temperature is in, the maximum heating water temperature for each ambient temperature range is defined. When the target outlet water temperature set by the user is less than the maximum heating water temperature, the heat pump main unit is controlled to operate at the target outlet water temperature, and the change value of the outlet water temperature when the heat pump main unit operates stably is obtained. Furthermore, when the change value of the outlet water temperature is small, it is determined that there is a heating demand, and then the electric auxiliary heating device is started to increase the heating output of the heat pump water heater to meet the water use demand of the user.

[0093] Reference Figure 5 , Figure 5 is a schematic flow chart of the third embodiment of a control method for a heat pump water heater according to the present invention.

[0094] Based on the above second embodiment, in this embodiment, step S30 further includes:

[0095] Step S301ˋ: Obtain the continuous temperature-reaching shutdown times of the heat pump main unit and the current temperature of the heat storage module of the heat pump water heater in the second operating state.

[0096] It should be noted that the second operating state means that when the target outlet water temperature is greater than the maximum outlet water temperature at which the heat pump can operate, the operating state of the heat pump main unit is controlled according to the maximum outlet water temperature at which the heat pump can operate; when the heat pump main unit operates in the second operating state, by judging the change value of the temperature of the heat storage module, it can be effectively judged whether the heating output of the heat pump water heater can meet the heating energy demand of the user.

[0097] If the target outlet water temperature set or calculated by the user is greater than the maximum outlet water temperature at which the heat pump can operate, in order to reduce the heating energy consumption and ensure reliability, in this embodiment, the heat pump main unit is driven to operate according to the maximum outlet water temperature at which the heat pump can operate. At this time, because the maximum outlet water temperature at which the heat pump can operate is less than the target outlet water temperature, when the heat pump main unit operates according to the maximum outlet water temperature at which the heat pump can operate, it is easy to reach the temperature and shut down. If the change value of the temperature of the heat storage module is small at this time, the situation of being unable to meet the hot water demand of the user will occur.

[0098] Step S302ˋ: Adjust the operating state of the electric auxiliary heating device according to the continuous temperature-reaching shutdown times, the change value of the temperature of the heat storage module, and the current temperature of the heat storage module.

[0099] It is worth noting that if the heat pump main unit frequently reaches the temperature and shuts down, it will cause great damage to the heat pump main unit and affect its service life. Therefore, in this embodiment, after multiple temperature-reaching shutdowns, the change value of the temperature of the heat storage module is obtained to judge whether there is a need to increase the heating output.

[0100] Further, adjusting the operating state of the electric auxiliary heating device according to the continuous temperature-reaching and shutdown times, the temperature change value of the heat storage module, and the current temperature of the heat storage module includes:

[0101] When the continuous temperature-reaching and shutdown times are greater than or equal to a preset threshold, the temperature change value of the heat storage module is less than or equal to a third temperature threshold, and the current temperature of the heat storage module is less than the set module temperature, start the electric auxiliary heating device.

[0102] Wherein the value range of the preset threshold is 1-5, preferably 3, and the value range of the third temperature threshold is 0-10°C, preferably 3°C.

[0103] In a specific implementation, taking the target outlet water temperature TWB set or calculated by the user as 63°C, the maximum outlet water temperature that the heat pump of the heat pump host can operate as 60°C, and the set temperature TSpcm of the heat storage water tank as 65°C as an example, since the target outlet water temperature TWB is greater than the maximum outlet water temperature that the heat pump can operate, in this case, the heat pump host operates at the maximum outlet water temperature of 60°C that the heat pump can operate. At this time, obtain the continuous temperature-reaching and shutdown times N of the heat pump host. If the continuous temperature-reaching and shutdown times N≥3, and the temperature change value Tpcm of the heat storage module ≤3°C, and the current temperature Tpcm of the heat storage module < the set value of 65°C, it indicates that the heat output of the heat pump is insufficient and there is still a heating demand. At this time, by starting the electric auxiliary heating operation, the heating output of the heat pump water heater is increased until the temperature Tpcm of the heat storage module ≥ the set temperature TSpcm of the heat storage module, and the heat storage water tank reaches the temperature and shuts down.

[0104] In this embodiment, by detecting and judging which interval the ambient temperature is in, the maximum heating water temperature of each ambient temperature interval is limited. When the target outlet water temperature set by the user is greater than or equal to the maximum heating water temperature, control the heat pump host to operate at the maximum heating water temperature, and then obtain the temperature-reaching and shutdown times and the temperature change value of the heat storage module when the heat pump host operates stably. Judge whether there is a heating demand according to the temperature-reaching and shutdown times and the temperature change value of the heat storage module. When there is a heating demand, by starting the electric auxiliary heating device, the heating output of the heat pump water heater is increased to meet the user's water use demand.

[0105] In addition, an embodiment of the present invention also provides a storage medium, on which a heat pump water heater control program is stored. When the heat pump water heater control program is executed by a processor, the steps of the heat pump water heater control method as described above are implemented.

[0106] Since this storage medium adopts all the technical solutions of the above all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0107] Refer to Figure 6 , Figure 6This is the structural block diagram of the first embodiment of the control device for the heat pump water heater of the present invention.

[0108] As Figure 6 shown, the control device for the heat pump water heater proposed in the embodiment of the present invention includes:

[0109] An acquisition module 10, configured to acquire the ambient temperature of the area where the heat pump main unit is located and the temperature of the heat storage module of the heat storage module when the heat pump water heater operates in the heat storage mode.

[0110] It should be understood that most of the heat pump water heaters on the market are water storage type, and the water in the water tank is heated by the heat pump main unit. The water stored in the water tank is in a "stagnant water" state. To overcome this drawback, a new phase change heat storage type heat pump water heater is provided in this embodiment. The phase change heat storage material is filled into the gaps between the heat exchange tubes of the heat storage module of the heat pump water heater. Heat exchange is carried out between the hot water in the tube and the phase change heat storage material to complete the phase change energy storage of the phase change heat storage material, and heat is released when using hot water to meet the user's demand for using hot water. However, during the process of charging and energy storage, affected by the ambient temperature, the outlet water temperature of the heat pump is limited, and only relying on the heat pump for charging may not reach the temperature required by the heat storage water tank, which will affect the user experience.

[0111] To solve the above problems, a phase change heat pump water heater is proposed in this embodiment. The heat pump water heater mentioned in this embodiment and the following embodiments refers to the phase change heat pump water heater as Figure 3 shown. The phase change heat pump water heater 100 includes a heat pump main unit 10, a hydraulic module 20, and a heat storage module 30. The heat pump main unit includes a gas-liquid separator 11, a compressor 12, a reversing device 13, an outdoor heat exchanger 14, an outdoor fan 15, and an expansion valve 16. The hydraulic module 20 includes an electric auxiliary heating device 21, a water flow switch 22, a water pump 23, and an expansion tank 24. The hydraulic module is also provided with a first sensor 25, and the heat storage module 30 is also provided with a second sensor 33. The first sensor 25 is used to collect the outlet water temperature, and the second sensor 33 is used to collect the temperature of the heat storage module. The heat pump main unit is connected to the hydraulic module through a water-fluorine heat exchanger 17.

[0112] Among them, the outdoor fan 15 is used to reduce the coil temperature of the outdoor heat exchanger 14, thereby accelerating the heat exchange between the heat exchanger and the external environment, and further achieving the control of the heating output capacity of the heat pump main unit 10. The greater the rotation speed of the outdoor fan 15, the greater the heating output of the heat pump main unit 10, and the smaller the rotation speed of the outdoor fan 14, the smaller the heating output capacity of the heat pump main unit 10.

[0113] Among them, the heat storage module includes a first heat exchange water circuit 31 and a second heat exchange water circuit 32. The first heat exchange water circuit 31 and the second heat exchange water circuit 32 together form a heat storage module heat exchanger. The heat storage module is connected to the hydraulic module 20 through the first heat exchange water circuit 31. The second heat exchange water circuit 32 is connected to the user water pipeline. The first heat exchange water circuit 31 is used to store heat for the phase change material in the heat storage module. The second heat exchange water circuit 32 is used to exchange heat with the first heat exchange water circuit through the phase change material.

[0114] During the operation of the heat pump main unit in the heat storage mode, the compressor 12 outputs high-temperature and high-pressure refrigerant to the commutation device 13. Through the selected terminal D-C of the commutation device 13, the high-temperature and high-pressure refrigerant exchanges heat through the water-fluorine heat exchanger 17. At this time, the water-fluorine heat exchanger 17 is used as a condenser. After the refrigerant exchanges heat through the water-fluorine heat exchanger 17, it sequentially passes through the expansion valve 16, the outdoor heat exchanger 14, the selected terminal E-S of the commutation device 13, and the gas-liquid separator 11 and returns to the compressor. During this process, since the first side of the water-fluorine heat exchanger 17 is connected to the heat pump main unit and the second side is connected to the hydraulic module, when there is high-temperature and high-pressure refrigerant on the first side of the water-fluorine heat exchanger, due to the temperature difference on both sides of the water-fluorine heat exchanger, the refrigerant on the first side will heat the water flowing through the second side of the water-fluorine heat exchanger, thereby realizing the heating of the water body in the pipeline of the hydraulic module.

[0115] In the hydraulic module, water is sent to the water-fluorine heat exchanger 17 by a water pump, so that the water body in the pipeline is heated through the water-fluorine heat exchanger 17, and then sequentially passes through the electric auxiliary heating device 21 and the water flow switch 22 and flows through the first heat exchange water circuit 31 of the heat storage module, realizing heat exchange with the phase change material filled in the heat storage module, achieving the purpose of heat storage, and finally returning to the expansion tank 24 or the water pump 23 to participate in the next water-fluorine heat exchange.

[0116] In the heat storage module, tap water enters the second heat exchange pipeline 32 of the heat storage module through the one-way valve in the user water pipeline. The second heat exchange pipeline 32 exchanges heat with the phase change material filled in the heat storage module to achieve the purpose of heating the user water.

[0117] In this embodiment, the heat pump main unit and the hydraulic module can be integrated into one module, that is, the hydraulic part is included in the heat pump main unit, or they can be separately and independently installed. The heat storage module can be a single heat storage module, or the heat storage module and the hydraulic part can together form a heat storage water tank.

[0118] The heat storage module heat exchanger can be composed of a finned-tube heat exchanger and a phase change material filled in its gaps. The finned-tube heat exchanger has two water circuits. One is connected to the hydraulic module, and the hot water provided by the hydraulic module pipeline flows through the heat storage module heat exchanger or the coil of the heat storage module to exchange heat with the phase change material, realizing the heat charging and energy storage process of the heat storage module. The other is connected to the user's water pipeline. When the user uses hot water, tap water is supplemented. The external water body exchanges heat with the phase change material through the second heat exchange water circuit in the heat storage module heat exchanger, realizing the heat release of the phase change material and achieving the process of raising the temperature of the user's water, meeting the user's demand for using hot water, and the mixed water can be controlled through the bypass tap water branch to control the outlet water temperature of the water use and meet the user's demand for the water temperature of the water use.

[0119] It can be understood that since the heat storage module is composed of two heat exchange water circuits, when obtaining the temperature of the heat storage module of the heat storage module, the temperature of the heat storage module of the heat storage module can be the average temperature of the two heat exchange water circuits of the heat storage module, or the temperature of the phase change material filled in the heat storage water tank. This embodiment does not make specific limitations on this.

[0120] The determination module 20 is used to determine the target outlet water temperature of the heat pump water heater when the temperature of the heat storage module is less than the set module temperature and the ambient temperature is within the heat pump operation range.

[0121] It should be noted that during the heat exchange process, the temperature of the heat storage water tank may fluctuate due to the influence of the surrounding ambient temperature. To reduce interference, in this embodiment, the set module temperature can also be set as the difference between the set temperature of the heat storage water tank and the preset dead band. Among them, the value range of the preset dead band is 1-10°C. In this embodiment, the value of the preset dead band is taken as 2°C as an example.

[0122] The heat pump operation range refers to the temperature under normal circumstances. In this embodiment, the heat pump operation range can be set as -40°C to 60°C. This embodiment does not make specific limitations on this.

[0123] In specific implementation, judging that the temperature of the heat storage module is less than the set module temperature and judging that the ambient temperature is within the heat pump operation range is to ensure that the heat pump water heater has a heating demand and the heat pump main unit can operate normally.

[0124] In this embodiment, there are two operating states of the heat pump main unit. One is that the heat pump main unit operates at the target outlet water temperature set by the user, and the other operating state is that the heat pump main unit operates at the maximum outlet water temperature that the heat pump can operate.

[0125] Furthermore, in order to accurately determine the operating state of the heat pump main unit and improve the control efficiency of the heat pump water heater, the determination of the target outlet water temperature of the heat pump water heater includes:

[0126] Determine the maximum outlet water temperature at which the heat pump can operate corresponding to the ambient temperature and the set outlet water temperature of the hydraulic module;

[0127] Determine the target outlet water temperature of the heat pump water heater according to the minimum value of the maximum outlet water temperature at which the heat pump can operate and the target outlet water temperature.

[0128] In specific implementation, affected by the operating range of the compressor, the ambient temperature and the outlet water temperature will affect the reliable operation of the heat pump. If the outlet water temperature is too high, the compressor discharge pressure is too high or the compression ratio exceeds the operable range, the compressor will not operate normally. Therefore, by querying the maximum outlet water temperature at which the heat pump can operate corresponding to the ambient temperature and comparing the maximum outlet water temperature at which the heat pump can operate with the target outlet water temperature set by the user, take the smaller value of the maximum outlet water temperature at which the heat pump can operate and the target outlet water temperature as the operating state of the heat pump main unit, and charge the heat storage module in a way with less energy consumption.

[0129] For example: when the target outlet water temperature TWB > the maximum outlet water temperature TWmax at which the heat pump can operate, the heat pump main unit operates according to the maximum outlet water temperature TWmax at which the heat pump can operate; when the target outlet water temperature TWB ≤ the maximum outlet water temperature TWmax at which the heat pump can operate, the heat pump main unit operates according to the target outlet water temperature TWB.

[0130] Further, after obtaining the ambient temperature of the area where the heat pump main unit is located and the heat storage module temperature of the heat storage module, it further includes:

[0131] When the ambient temperature is not within the heat pump operating range, start the electric auxiliary heating device.

[0132] In specific implementation, if the heat pump main unit does not meet the normal operating conditions, in order to ensure the normal water use of the user, this embodiment can heat the water body in the hydraulic module pipeline by starting the electric auxiliary heating device, so as to realize the heat storage of the phase change material.

[0133] The adjustment module 30 is used to obtain the temperature change value of the heat pump water heater when the heat pump water heater operates at the target outlet water temperature, and adjust the operating state of the electric auxiliary heating device according to the temperature change value.

[0134] It should be noted that the temperature change values obtained in different operating states in this embodiment are different. Among them, when the target outlet water temperature is less than or equal to the maximum outlet water temperature at which the heat pump can operate, the temperature change value of the outlet water temperature of the hydraulic module within a preset time period is obtained under the condition of controlling the operating state of the heat pump main unit according to the target outlet water temperature; when the target outlet water temperature is greater than the maximum outlet water temperature at which the heat pump can operate, the temperature change value of the heat storage module temperature of the heat storage module within a preset time period is obtained under the condition of controlling the operating state of the heat pump main unit according to the maximum outlet water temperature at which the heat pump can operate.

[0135] Control the electric auxiliary heating device according to the temperature change values corresponding to different operating states, and reduce the operating energy consumption of the heat pump water heater during heating without affecting the normal use of hot water by users.

[0136] In one embodiment, the determining module 20 is further configured to determine the maximum outlet water temperature at which the heat pump can operate corresponding to the ambient temperature and the set outlet water temperature of the hydraulic module; determine the target outlet water temperature of the heat pump water heater according to the minimum temperature value among the maximum outlet water temperature at which the heat pump can operate and the target outlet water temperature.

[0137] In one embodiment, the adjusting module 30 is further configured to, when the ambient temperature is less than the first temperature threshold, obtain the current heat storage module temperature of the heat storage module of the heat pump water heater in the first operating state; adjust the operating state of the electric auxiliary heating device according to the outlet water temperature change value and the current heat storage module temperature.

[0138] In one embodiment, the adjusting module 30 is further configured to start the electric auxiliary heating device when the current heat storage module temperature is less than the set module temperature and the outlet water temperature change value is less than or equal to the second temperature threshold.

[0139] In one embodiment, the adjusting module 30 is further configured to obtain the continuous temperature-reaching shutdown times of the heat pump main unit and the current heat storage module temperature of the heat pump water heater in the second operating state; adjust the operating state of the electric auxiliary heating device according to the continuous temperature-reaching shutdown times, the heat storage module temperature change value, and the current heat storage module temperature.

[0140] In one embodiment, the adjusting module 30 is further configured to start the electric auxiliary heating device when the continuous temperature-reaching shutdown times are greater than or equal to the preset threshold, the heat storage module temperature change value is less than or equal to the third temperature threshold, and the current heat storage module temperature is less than the set module temperature.

[0141] In one embodiment, the determining module 20 is further configured to start the electric auxiliary heating device when the ambient temperature is not within the heat pump operating range.

[0142] In this embodiment, when the heat pump water heater operates in the heat storage mode, the ambient temperature of the area where the heat pump host is located and the heat storage module temperature of the heat storage module are obtained; when the heat storage module temperature is less than the set module temperature and the ambient temperature is within the heat pump operation range, the target outlet water temperature of the heat pump water heater is determined; when the heat pump water heater operates at the target outlet water temperature, the temperature change value of the heat pump water heater is obtained, and the operation state of the electric auxiliary heating device is adjusted according to the temperature change value. First, the operation state of the heat pump host is determined, and whether the operation state of the electric auxiliary heating device needs to be adjusted is judged according to the temperature change value obtained under different operation states, so that when the heating capacity of the heat pump host is insufficient, the electric auxiliary heating device can be started to finely control the heat storage process, making the control process more stable and reliable.

[0143] It should be understood that although the steps in the flowchart in the embodiment of the present application are shown in sequence according to the indication of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and they can be executed in other orders. Moreover, at least a part of the steps in the figure may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

[0144] It should be understood that the above is only an example for illustration and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0145] It should be noted that the above-described work process is only illustrative and does not limit the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and there is no limitation here.

[0146] In addition, for the technical details not described in detail in this embodiment, reference can be made to the heat pump water heater control method provided in any embodiment of the present invention, which will not be elaborated here.

[0147] In addition, it should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or system. Without further limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or system including such element.

[0148] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0149] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, magnetic disk, optical disk), and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0150] The above are only the preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the content of the drawings, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present invention.

Claims

1. A control method for a heat pump water heater, characterized in that, The control method of the heat pump water heater is applied to a heat pump water heater, which includes a heat pump main unit, a hydraulic module, and a heat storage module. The heat pump main unit includes a compressor, a reversing device, an outdoor heat exchanger, an outdoor fan, and an expansion valve. The hydraulic module includes an electric auxiliary heating device, a water pump, and a water-fluorine heat exchanger. The heat pump main unit is connected to the hydraulic module through the water-fluorine heat exchanger. The heat storage module includes a first heat exchange water circuit and a second heat exchange water circuit. The heat storage module is connected to the hydraulic module through the first heat exchange water circuit. The second heat exchange water circuit is connected to the user's water pipeline. The first heat exchange water circuit is used to store heat for the phase change material in the heat storage module. The second heat exchange water circuit is used to exchange heat with the first heat exchange water circuit through the phase change material. The control method of the heat pump water heater includes: When the heat pump water heater operates in the heat storage mode, obtain the ambient temperature of the area where the heat pump main unit is located and the temperature of the heat storage module of the heat storage module. When the temperature of the heat storage module is less than the set module temperature and the ambient temperature is within the heat pump operating range, determine the target outlet water temperature of the heat pump water heater. When the heat pump water heater operates at the target outlet water temperature, obtain the temperature change value of the heat pump water heater, and adjust the operating state of the electric auxiliary heating device according to the temperature change value.

2. The control method for a heat pump water heater according to claim 1, characterized in that, The determination of the target outlet water temperature of the heat pump water heater includes: Determine the maximum outlet water temperature that the heat pump can operate corresponding to the ambient temperature and the set outlet water temperature of the hydraulic module. Determine the target outlet water temperature of the heat pump main unit according to the minimum temperature value among the maximum outlet water temperature that the heat pump can operate and the target outlet water temperature.

3. The control method for a heat pump water heater according to claim 1, characterized in that, The temperature change value includes the outlet water temperature change value of the hydraulic module corresponding to the first operating state. The first operating state is when the target outlet water temperature is less than or equal to the maximum outlet water temperature that the heat pump can operate, and the operating state of the heat pump main unit is controlled according to the target outlet water temperature. The obtaining of the temperature change value of the heat pump water heater and the adjustment of the operating state of the electric auxiliary heating device according to the temperature change value include: When the ambient temperature is less than the first temperature threshold, obtain the current temperature of the heat storage module of the heat pump water heater in the first operating state. Adjust the operating state of the electric auxiliary heating device according to the outlet water temperature change value and the current temperature of the heat storage module.

4. The control method for a heat pump water heater according to claim 3, characterized in that, The adjustment of the operating state of the electric auxiliary heating device according to the outlet water temperature change value and the current temperature of the heat storage module includes: When the current temperature of the heat storage module is less than the set module temperature and the outlet water temperature change value is less than or equal to the second temperature threshold, start the electric auxiliary heating device.

5. The control method for a heat pump water heater according to claim 1, characterized in that, The temperature change value also includes the temperature change value of the heat storage module corresponding to the second operating state. The second operating state is when the target outlet water temperature is greater than the maximum outlet water temperature that the heat pump can operate, and the operating state of the heat pump main unit is controlled according to the maximum outlet water temperature that the heat pump can operate. The obtaining of the temperature change value of the heat pump water heater and the adjustment of the operating state of the electric auxiliary heating device according to the temperature change value include: Obtain the continuous temperature - reaching shutdown times of the heat pump main unit and the current temperature of the heat storage module of the heat pump water heater in the second operating state; Adjust the operating state of the electric auxiliary heating device according to the continuous temperature - reaching shutdown times, the temperature change value of the heat storage module, and the current temperature of the heat storage module.

6. The control method for a heat pump water heater according to claim 5, characterized in that, The adjusting the operating state of the electric auxiliary heating device according to the continuous temperature - reaching shutdown times, the temperature change value of the heat storage module, and the current temperature of the heat storage module includes: When the continuous temperature - reaching shutdown times is greater than or equal to a preset threshold, the temperature change value of the heat storage module is less than or equal to a third temperature threshold, and the current temperature of the heat storage module is less than the set module temperature, start the electric auxiliary heating device.

7. The control method for a heat pump water heater according to any one of claims 1-6, characterized in that, After obtaining the ambient temperature of the area where the heat pump main unit is located and the temperature of the heat storage module of the heat storage module, it further includes: When the ambient temperature is not within the heat pump operating range, start the electric auxiliary heating device.

8. A control device for a heat pump water heater, characterized in that, The heat pump water heater control device includes: An acquisition module, configured to obtain the ambient temperature of the area where the heat pump main unit is located and the temperature of the heat storage module of the heat storage module when the heat pump water heater operates in the heat storage mode; A determination module, configured to determine the target outlet water temperature of the heat pump water heater when the temperature of the heat storage module is less than the set module temperature and the ambient temperature is within the heat pump operating range; An adjustment module, configured to obtain the temperature change value of the heat pump water heater when the heat pump water heater operates at the target outlet water temperature, and adjust the operating state of the electric auxiliary heating device according to the temperature change value.

9. A heat pump water heater, characterized in that, The heat pump water heater includes: a memory, a processor, and a heat pump water heater control program stored on the memory and executable on the processor, and the heat pump water heater control program is configured to implement the heat pump water heater control method according to any one of claims 1 to 7.

10. A storage medium, characterized in that, A heat pump water heater control program is stored on the storage medium, and when the heat pump water heater control program is executed by a processor, it implements the heat pump water heater control method according to any one of claims 1 to 7.

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