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. And the environment temperature of the area where a heat pump main machine in the heat pump water heater is located, the water outlet temperature of a hydraulic module and the operation frequency of a compressor are obtained, and the fan rotating speed of an outdoor fan is adjusted according to at least one of the environment temperature, the water outlet temperature and the operation frequency. Different control strategies are adopted for the outdoor fan in different operation scenes, the rotating speed of the outdoor fan corresponds to the environment temperature, the water outlet temperature and the operation frequency, operation is more stable and reliable, the technical problem that in the prior art, when the heating requirement of a heat pump water heater is small, the heat pump water heater can frequently reach the temperature and shut down is solved, and the operation reliability is improved.

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 a heat pump system, so that the water in the water tank maintains a relatively high water temperature for users to use. During this process, if the environmental temperature in the area where the heat pump water heater is located is relatively high and the user's demand for hot water is small, if a large heat pump output is still maintained, it will cause the heat pump system to frequently reach the set temperature and stop.

[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 that the heat pump water heater frequently reaches the set temperature and stops when the heating demand is small in the prior art.

[0005] To achieve the above object, the present invention provides a control method for a heat pump water heater. The control method for the heat pump water heater is applied to a heat pump water heater, and 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 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 a 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 a heat storage mode, obtain the environmental temperature in the area where the heat pump main unit is located, the outlet water temperature of the hydraulic module, and the operating frequency of the compressor.

[0008] Adjust the fan speed of the outdoor fan according to at least one of the environmental temperature, the outlet water temperature, and the operating frequency.

[0009] Optionally, the adjusting the fan speed of the outdoor fan according to at least one of the environmental temperature, the outlet water temperature, and the operating frequency includes:

[0010] When the ambient temperature meets the first control condition, adjust the fan speed of the outdoor fan according to the outlet water temperature and / or the operating frequency;

[0011] When the ambient temperature meets the second control condition, adjust the fan speed of the outdoor fan according to the operating frequency;

[0012] When the ambient temperature meets the third control condition, adjust the fan speed of the outdoor fan according to the ambient temperature.

[0013] Optionally, the first control condition includes that the ambient temperature is in an upward trend and the ambient temperature is greater than the first temperature threshold, or the ambient temperature is in a downward trend and the ambient temperature is greater than the second temperature threshold, and the first temperature threshold is the sum of the second temperature threshold and the preset hysteresis;

[0014] Correspondingly, the adjusting the fan speed of the outdoor fan according to the outlet water temperature and / or the operating frequency includes:

[0015] When the outlet water temperature is in an upward trend and greater than or equal to the third temperature threshold, or the outlet water temperature is in a downward trend and greater than or equal to the fourth temperature threshold, adjust the fan speed of the outdoor fan according to the outlet water temperature and the outlet water temperature - wind speed mapping relationship, and the third temperature threshold is the sum of the fourth temperature threshold and the preset hysteresis;

[0016] When the outlet water temperature is in an upward trend and less than the third temperature threshold, or the outlet water temperature is in a downward trend and less than the fourth temperature threshold, adjust the fan speed of the outdoor fan according to the operating frequency and the operating frequency - wind speed mapping relationship.

[0017] Optionally, before adjusting the fan speed of the outdoor fan according to the outlet water temperature and the outlet water temperature - wind speed mapping relationship, it further includes:

[0018] Determine the speed range between the maximum value and the minimum value of the fan speed, and the outlet water temperature range between the maximum value and the minimum value of the outlet water temperature;

[0019] According to the preset first mapping rule, the correlation between the maximum value of the fan speed and the minimum value of the outlet water temperature, and the correlation between the minimum value of the fan speed and the maximum value of the outlet water temperature, associate the speed range and the outlet water temperature range to obtain the outlet water temperature - wind speed mapping relationship.

[0020] Optionally, before adjusting the fan speed of the outdoor fan according to the operating frequency and the operating frequency - wind speed mapping relationship, it further includes:

[0021] Determine the speed range between the maximum and minimum speeds of the fan, and the frequency range between the maximum and minimum operating frequencies of the compressor;

[0022] According to the preset second mapping rule, the correlation between the maximum value of the fan speed and the maximum value of the operating frequency, and the correlation between the minimum value of the fan speed and the minimum value of the operating frequency, associate the speed range and the frequency range to obtain the operating frequency - wind speed mapping relationship.

[0023] Optionally, the second control condition includes that the ambient temperature is in an upward trend, and the ambient temperature is less than or equal to the first temperature threshold and greater than the fifth temperature threshold, or the ambient temperature is in a downward trend, and the ambient temperature is less than or equal to the second temperature threshold and greater than the sixth temperature threshold. The fifth temperature threshold is the sum of the sixth temperature threshold and the preset hysteresis;

[0024] Correspondingly, adjusting the fan speed of the outdoor fan according to the operating frequency includes:

[0025] Adjust the fan speed of the outdoor fan according to the operating frequency and the operating frequency - wind speed mapping relationship.

[0026] Optionally, the third control condition includes that the ambient temperature is in an upward trend and the ambient temperature is less than or equal to the fifth temperature threshold, or the ambient temperature is in a downward trend and the ambient temperature is less than or equal to the sixth temperature threshold;

[0027] Correspondingly, adjusting the fan speed of the outdoor fan according to the ambient temperature includes:

[0028] Adjust the fan speed of the outdoor fan according to the ambient temperature and the ambient temperature - wind speed mapping relationship.

[0029] Optionally, before adjusting the fan speed of the outdoor fan according to the ambient temperature and the ambient temperature - wind speed mapping relationship, it further includes:

[0030] Determine the speed range between the maximum and minimum speeds of the fan, and the temperature range between the maximum and minimum values of the ambient temperature;

[0031] According to the preset third mapping rule, the correlation between the maximum value of the fan speed and the minimum value of the ambient temperature, and the correlation between the minimum value of the fan speed and the maximum value of the ambient temperature, associate the speed range and the temperature range to obtain the ambient temperature - wind speed mapping relationship.

[0032] In addition, to achieve the above object, the present invention further provides a control device for a heat pump water heater, the control device for the heat pump water heater comprising:

[0033] An acquisition module, configured to acquire the ambient temperature of the area where the heat pump host is located, the outlet water temperature of the hydraulic module, and the operating frequency of the compressor when the heat pump water heater operates in a heat storage mode;

[0034] An adjustment module, configured to adjust the fan speed of the outdoor fan according to at least one of the ambient temperature, the outlet water temperature, and the operating frequency.

[0035] In addition, to achieve the above object, the present invention further provides a heat pump water heater, the heat pump water heater comprising: a memory, a processor, and a heat pump water heater control program stored on the memory and executable on the processor, the heat pump water heater control program being configured to implement the steps of the heat pump water heater control method as described above.

[0036] In addition, to achieve the above object, the present invention further provides 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, the steps of the heat pump water heater control method as described above are implemented.

[0037] When the heat pump water heater operates in a heat storage mode, the present invention acquires the ambient temperature of the area where the heat pump host in the heat pump water heater is located, the outlet water temperature of the hydraulic module, and the operating frequency of the compressor, and adjusts the fan speed of the outdoor fan according to at least one of the ambient temperature, the outlet water temperature, and the operating frequency, so as to adopt different control strategies for the outdoor fan in different operating scenarios, make the rotation speed of the outdoor fan correspond to the ambient temperature, the outlet water temperature, and the operating frequency, and operate more stably and reliably, avoiding the technical problem that in the prior art, when the heating demand of the heat pump water heater is small, it will frequently reach the temperature and stop, and improving the operating reliability. Description of the Drawings

[0038] Figure 1 is a schematic structural diagram of a heat pump water heater in a hardware operating environment related to the embodiment solution of the present invention;

[0039] Figure 2 is a schematic flowchart of the first embodiment of the heat pump water heater control method of the present invention;

[0040] Figure 3 is a schematic structural diagram of a heat pump water heater in the first embodiment of the heat pump water heater control method of the present invention;

[0041] Figure 4 is a schematic flowchart of the second embodiment of the heat pump water heater control method of the present invention;

[0042] Figure 5 This is a structural block diagram of the first embodiment of the control device for the heat pump water heater of the present invention.

[0043] Explanation of reference numerals:

[0044] 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

[0045] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0046] 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.

[0047] Refer to Figure 1 , Figure 1 This is a schematic structural diagram of the heat pump water heater for the hardware operating environment involved in the embodiment solution of the present invention.

[0048] As Figure 1 shown, the heat pump water heater 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 (Display) and an input unit such as a keyboard (Keyboard). Optionally, the user interface 1003 may further 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 (Random Access Memory, RAM), or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the foregoing processor 1001.

[0049] Those skilled in the art can understand that Figure 1 the structure shown in

[0050] does not constitute a limitation on the heat pump water heater, and may include more or fewer components than shown in the figure, or combine some components, or arrange different components. Figure 1 As

[0051] In Figure 1In the heat pump water heater 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 of the present invention can be arranged in the heat pump water heater. The heat pump water heater 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.

[0052] Embodiments of the present invention provide a heat pump water heater control method. Refer to Figure 2 , Figure 2 which is a schematic flowchart of the first embodiment of a heat pump water heater control method of the present invention.

[0053] In this embodiment, the heat pump water heater control method includes the following steps:

[0054] Step S10: When the heat pump water heater operates in a heat storage mode, obtain the ambient temperature of the area where the heat pump main unit is located, the outlet water temperature of the hydraulic module, and the operating frequency of the compressor.

[0055] 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 a heat pump water heater unit provided with a phase change heat pump system, or other devices that can achieve the same or similar functions. This embodiment does not make specific limitations in this regard. In this embodiment and the following embodiments, the heat pump water heater will be used as an example for illustration.

[0056] It is worth noting that the heat pump water heater mentioned in this embodiment and the following embodiments refers to a Figure 3 phase change heat pump water heater as 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 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 a water pump 23 and a water-fluorine heat exchanger 17. The hydraulic module is further provided with a first sensor 25, and the heat storage module 30 is further 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.

[0057] Among them, the outdoor fan 15 is used to increase the coil temperature of the outdoor heat exchanger 14 during heating, so as to accelerate the heat exchange between the heat exchanger and the external environment, and further control 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.

[0058] 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 to store heat for the phase change material in the heat storage module, and the second heat exchange water circuit 32 is used to exchange heat with the first heat exchange water circuit through the phase change material.

[0059] During the operation of the heat pump host 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, and the selected terminal E-S of the commutation device 13 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 host 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 in the pipeline in the hydraulic module.

[0060] 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, flows through the first heat exchange water circuit 31 of the heat storage module, and exchanges heat with the phase change material filled in the heat storage module to achieve the purpose of heat storage, and finally returns to the water pump 23 to participate in the next water-fluorine heat exchange.

[0061] In the heat storage module, tap water enters the second heat exchange pipeline 32 of the heat storage module through the check 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 raising the temperature of the user's water.

[0062] In this embodiment, the heat pump host and the hydraulic module can be integrated into one module, that is, the hydraulic part is included in the heat pump host, or they can be separately installed independently. The heat storage module can be a separate heat storage module, or the heat storage module and the hydraulic part can together form a heat storage water tank.

[0063] 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 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, 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.

[0064] It should be understood that during the heat storage operation of the phase change heat pump water heater, when the ambient temperature is relatively high and the user's demand for the heating capacity of the heat pump is relatively small, if the heat pump main unit always maintains a high heating output, it will cause the heat pump main unit to frequently reach the set temperature and stop. Although it can ensure the user's demand for hot water, the operating energy consumption increases due to frequent start and stop, and the operation of the heat pump main unit is unstable.

[0065] To solve the above problems, in this embodiment, by real-time monitoring the operating frequency of the compressor in the heat pump main unit, the outlet water temperature of the hydraulic module, and the outdoor ambient temperature, different control schemes are executed for the rotational speed of the outdoor fan according to different parameters, so that the rotational speed of the outdoor fan matches the ambient temperature, the outlet water temperature, and the operating frequency, avoiding frequent reaching of the set temperature and stopping when the heating demand of the heat pump water heater is small, and the operation is more reliable.

[0066] It can be understood that the ambient temperature of the area where the heat pump main unit is located can also be called the outdoor ambient temperature; the outlet water temperature of the hydraulic module refers to the water temperature at the second side outlet of the water-to-refrigerant heat exchanger in the hydraulic module. If the electric auxiliary heating device is turned on in the hydraulic module, the outlet water temperature can be the water temperature after being heated by the water-to-refrigerant heat exchanger and the electric auxiliary heating device. Among them, the above ambient temperature and outlet water temperature can be collected by a temperature acquisition device, such as a temperature sensing bulb or a temperature sensor, etc. This embodiment does not make specific limitations on this.

[0067] Step S20: Adjust the fan speed of the outdoor fan according to at least one of the ambient temperature, the outlet water temperature, and the operating frequency.

[0068] It should be noted that after determining the set temperature of the heat storage water tank, start the heat pump water heater, and at the same time detect the ambient temperature in the area where the heat pump main unit is located, the outlet water temperature of the hydraulic module, and the operating frequency of the compressor, so as to adjust the fan speed of the outdoor fan in real time. During this process, the change trend of the ambient temperature can be judged first, and then according to the change trend of the ambient temperature and the temperature range where the ambient temperature is located, it can be judged which one of the ambient temperature, the outlet water temperature or the operating frequency is used to adjust the fan speed of the outdoor fan, so as to reduce the heating output of the heat pump main unit and avoid frequent temperature reaching and shutdown.

[0069] In this embodiment, when the heat pump water heater operates in the heat storage mode, the ambient temperature in the area where the heat pump main unit in the heat pump water heater is located, the outlet water temperature of the hydraulic module, and the operating frequency of the compressor are obtained, and the fan speed of the outdoor fan is adjusted according to at least one of the ambient temperature, the outlet water temperature, and the operating frequency, so that different control strategies are adopted for the outdoor fan in different operating scenarios, so that the speed of the outdoor fan corresponds to the ambient temperature, the outlet water temperature, and the operating frequency, and the operation is more stable and reliable, avoiding the technical problem that the heat pump water heater frequently reaches the temperature and shuts down when the heating demand is small in the prior art, and improving the operation reliability.

[0070] Reference Figure 4 , Figure 4 is a schematic flow chart of the second embodiment of a control method for a heat pump water heater according to the present invention.

[0071] Based on the above first embodiment, in this embodiment, the step S20 includes:

[0072] Step S201: When the ambient temperature satisfies the first control condition, adjust the fan speed of the outdoor fan according to the outlet water temperature and / or the operating frequency.

[0073] It should be noted that the first control condition means that the ambient temperature is in an upward trend and the ambient temperature is greater than the first temperature threshold. The first control condition can also be that the ambient temperature is in a downward trend and the ambient temperature is greater than the second temperature threshold, which is mainly used to characterize the possibility that the heating output of the heat pump main unit may reach the temperature and shut down, and adjust the fan speed of the outdoor fan according to the outlet water temperature and / or the operating frequency. Among them, the value ranges of the first temperature threshold and the second temperature threshold are -40°C to 60°C, and the first temperature threshold is greater than the second temperature threshold. The first temperature threshold is the sum of the second temperature threshold and the preset dead zone, and the value range of the preset dead zone is 1 to 10°C. In this embodiment, the value of the preset dead zone is taken as 2°C, and the first temperature threshold is taken as 24°C and the second temperature threshold is taken as 22°C for illustration.

[0074] Further, the adjusting the fan speed of the outdoor fan according to the outlet water temperature and / or the operating frequency includes:

[0075] When the outlet water temperature is on the rise and greater than or equal to the third temperature threshold, or when the outlet water temperature is on the decline and greater than or equal to the fourth temperature threshold, adjust the fan speed of the outdoor fan according to the outlet water temperature and the outlet water temperature - wind speed mapping relationship, where the third temperature threshold is the sum of the fourth temperature threshold and a preset hysteresis.

[0076] When the outlet water temperature is on the rise and less than the third temperature threshold, or when the outlet water temperature is on the decline and less than the fourth temperature threshold, adjust the fan speed of the outdoor fan according to the operating frequency and the operating frequency - wind speed mapping relationship.

[0077] Among them, when the outlet water temperature is on the rise, if the outlet water temperature is greater than or equal to the third threshold, or when the ambient temperature is on the decline, if the outlet water temperature is greater than or equal to the fourth temperature threshold, the fan speed of the outdoor fan is adjusted through the mapping relationship between the outlet water temperature of the hydraulic module and the pre-measured outlet water temperature - wind speed. This can not only ensure the normal heating output of the heat pump water heater, but also avoid the situation of too high outlet water temperature and reaching the set temperature and stopping operation. In this embodiment, the value range of the third temperature threshold is 25°C to 65°C. In this embodiment, the third temperature threshold is taken as 47°C and the fourth temperature threshold is taken as 45°C for illustration.

[0078] For example: when the ambient temperature T4 is on the rise and T4 > 24°C, or when the ambient temperature T4 is on the decline and the ambient temperature T4 > 22°C, the outdoor fan speed is controlled according to the outlet water temperature TW. When the outlet water temperature TW is on the rise and the outlet water temperature TW ≥ 47°C, or when the outlet water temperature TW is on the decline and the outlet water temperature TW ≥ 45°C, the outlet water temperature TW is partitioned, and the fan speed is corresponding to the partitioned outlet water temperature. The higher the TW, the lower the fan speed; the lower the TW, the higher the fan speed.

[0079] In addition, when the outlet water temperature is on the rise, if the outlet water temperature is less than the third threshold, or when the ambient temperature is on the decline, if the outlet water temperature is less than the fourth temperature threshold, the fan speed of the outdoor fan is adjusted through the operating frequency and the pre-measured operating frequency - wind speed mapping relationship. This can not only ensure the normal heating output of the heat pump water heater, but also avoid the situation of too high compressor operating frequency and reaching the set temperature and stopping operation.

[0080] For example: when the outlet water temperature TW is on the rise and the outlet water temperature TW < 47°C, or when the outlet water temperature TW is on the decline and the outlet water temperature TW < 45°C, the operating frequency of the compressor is partitioned, and the fan speed is corresponding to the operating frequency. The lower the operating frequency, the lower the fan speed, showing a positive correlation.

[0081] Further, before adjusting the fan speed of the outdoor fan according to the water outlet temperature and the water outlet temperature - wind speed mapping relationship, the following steps are also included:

[0082] Determine the speed range between the maximum value and the minimum value of the fan speed, and the water outlet temperature range between the maximum value and the minimum value of the water outlet temperature;

[0083] According to the preset first mapping rule, the correlation between the maximum value of the fan speed and the minimum value of the water outlet temperature, and the correlation between the minimum value of the fan speed and the maximum value of the water outlet temperature, associate the fan speed range and the water outlet temperature range to obtain the water outlet temperature - wind speed mapping relationship.

[0084] It can be understood that the first mapping rule means corresponding the maximum value of the fan speed to the minimum value of the water outlet temperature, corresponding the minimum value of the fan speed to the maximum value of the water outlet temperature, and evenly dividing the speed range between the maximum value and the minimum value of the fan speed and the water outlet temperature range between the maximum value and the minimum value of the water outlet temperature according to a certain quantity to obtain the fan speed and the water outlet temperature with the same number of partitions. At this time, according to the corresponding relationship between the maximum value and the minimum value, a negative correlation is formed between the fan speed and the water outlet temperature.

[0085] In specific implementation, during the association process, the fan speed range and the water outlet temperature range can be evenly divided and continuously corresponded, that is, showing a linear negative correlation; they can also be segmented and corresponded, that is, showing a stepped negative correlation. This embodiment does not make specific limitations on this.

[0086] Further, before adjusting the fan speed of the outdoor fan according to the operating frequency and the operating frequency - wind speed mapping relationship, the following steps are also included:

[0087] Determine the speed range between the maximum value and the minimum value of the fan speed, and the frequency range between the maximum value and the minimum value of the operating frequency of the compressor;

[0088] According to the preset second mapping rule, the correlation between the maximum value of the fan speed and the maximum value of the operating frequency, and the correlation between the minimum value of the fan speed and the minimum value of the operating frequency, associate the speed range and the frequency range to obtain the operating frequency - wind speed mapping relationship.

[0089] It can be understood that the second mapping rule means corresponding the maximum value of the operating frequency of the compressor to the maximum value of the fan speed, corresponding the minimum value of the operating frequency to the minimum value of the fan speed, and evenly dividing the speed range between the maximum and minimum values of the fan speed and the operating frequency range between the maximum and minimum values of the operating frequency according to a certain number to obtain the same number of partitions of the fan speed and the operating frequency. At this time, according to the corresponding relationship between the maximum and minimum values, a positive correlation is formed between the fan speed and the operating frequency.

[0090] In specific implementation, during the association process, the fan speed range and the operating frequency range can be evenly divided and continuously corresponded, that is, showing a linear negative correlation; or the fan speed range and the operating frequency range can be segmented and corresponded, that is, showing a stepped positive correlation. This embodiment does not make specific restrictions on this.

[0091] Step S202: When the ambient temperature satisfies the second control condition, adjust the fan speed of the outdoor fan according to the operating frequency.

[0092] It should be noted that the second control condition includes that the ambient temperature is on the rise, and the ambient temperature is less than or equal to the first temperature threshold and greater than the fifth temperature threshold, or the ambient temperature is on the decline, and the ambient temperature is less than or equal to the second temperature threshold and greater than the sixth temperature threshold. Among them, the value ranges of the fifth temperature threshold and the sixth temperature threshold are -40°C to 60°C, and the fifth temperature threshold is greater than the sixth temperature threshold. The fifth temperature threshold is the sum of the sixth temperature threshold and the preset hysteresis. In this embodiment, the fifth temperature threshold is taken as 10°C and the sixth temperature threshold is taken as 8°C for illustration.

[0093] Further, the adjusting the fan speed of the outdoor fan according to the operating frequency includes:

[0094] Adjust the fan speed of the outdoor fan according to the operating frequency and the operating frequency - wind speed mapping relationship.

[0095] In specific implementation, when the ambient temperature T4 is on the rise, and the ambient temperature T4 ≤ 24°C, and the ambient temperature T4 > 10°C; or the ambient temperature T4 is on the decline, and the ambient temperature T4 ≤ 22°C, and the ambient temperature T4 > 8°C, the speed of the outdoor fan is adjusted through the operating frequency and the previously measured operating frequency - wind speed mapping relationship, which can not only ensure the normal heating output of the heat pump water heater, but also avoid the situation that the operating frequency of the compressor is too high and the temperature reaches the set value and the machine stops.

[0096] Among them, the determination of the operating frequency - wind speed mapping relationship is the same as above, and this embodiment will not elaborate too much on this.

[0097] Step S203: When the ambient temperature meets the third control condition, adjust the fan speed of the outdoor fan according to the ambient temperature.

[0098] It should be understood that the third control condition includes that the ambient temperature is in an upward trend and the ambient temperature is less than or equal to the fifth temperature threshold, or the ambient temperature is in a downward trend and the ambient temperature is less than or equal to the sixth temperature threshold.

[0099] Further, the adjusting the fan speed of the outdoor fan according to the ambient temperature includes:

[0100] Adjust the fan speed of the outdoor fan according to the ambient temperature and the ambient temperature - wind speed mapping relationship.

[0101] In a specific implementation, when the ambient temperature T4 is in an upward trend and at the same time the ambient temperature T4 ≤ 10°C; or the ambient temperature T4 is in a downward trend and at the same time the ambient temperature T4 ≤ 8°C, adjust the speed of the outdoor fan through the mapping relationship between the ambient temperature and the previously measured ambient temperature - wind speed, which can not only ensure the normal heating output of the heat pump water heater, but also avoid the situation that the ambient temperature in the area where the heat pump host is located is too low, affecting the normal use of users.

[0102] Further, before adjusting the fan speed of the outdoor fan according to the ambient temperature and the ambient temperature - wind speed mapping relationship, it further includes:

[0103] Determine the speed range between the maximum value and the minimum value of the fan speed, and the temperature range between the maximum value and the minimum value of the ambient temperature;

[0104] According to the preset third mapping rule, the correlation between the maximum value of the fan speed and the minimum value of the ambient temperature, and the correlation between the minimum value of the fan speed and the maximum value of the ambient temperature, associate the speed range and the temperature range to obtain the ambient temperature - wind speed mapping relationship.

[0105] It can be understood that the preset third mapping rule means corresponding the maximum value of the fan speed to the minimum value of the ambient temperature, corresponding the minimum value of the fan speed to the maximum value of the ambient temperature, and evenly dividing the speed range between the maximum value and the minimum value of the fan speed and the ambient temperature range between the maximum value and the minimum value of the ambient temperature according to a certain number to obtain the same number of partitions of the fan speed and the ambient temperature. At this time, according to the corresponding relationship between the maximum value and the minimum value, the fan speed and the ambient temperature are negatively correlated.

[0106] In a specific implementation, during the association process, considering the possibility of outdoor ambient temperature, in this embodiment, the ambient temperature range between the maximum and minimum outdoor ambient temperatures is set to be between -40°C and 60°C, and it is evenly divided. The fan speed range and the ambient temperature range can be continuously and correspondingly evenly divided, showing a linear negative correlation; or the fan speed range and the ambient temperature range can be segmented and correspondingly divided, showing a stepped negative correlation. This embodiment does not make specific limitations on this.

[0107] In this embodiment, by determining which range the ambient temperature is in, it is determined whether the ambient temperature meets the control conditions of the indoor fan, and at least one of the ambient temperature, the water outlet temperature, and the operating frequency is selected according to the temperature range where the ambient temperature is located to adjust the fan speed of the outdoor fan, improving the operating stability of the heat pump main unit, meeting the heating requirements of users, and avoiding the frequent occurrence of reaching the set temperature and shutting down.

[0108] In addition, an embodiment of the present invention also proposes 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.

[0109] Since this storage medium adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0110] Refer to Figure 5 , Figure 5 , which is the structural block diagram of the first embodiment of the heat pump water heater control device of the present invention.

[0111] As Figure 5 shown, the heat pump water heater control device proposed by the embodiment of the present invention includes:

[0112] An acquisition module 10, configured to acquire the ambient temperature of the area where the heat pump main unit is located, the water outlet temperature of the hydraulic module, and the operating frequency of the compressor when the heat pump water heater operates in a heat storage mode.

[0113] It should be noted that the heat pump water heater mentioned in this embodiment and the following embodiments refers to such as Figure 3The phase change heat pump water heater 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 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 a water pump 23 and a water-fluorine heat exchanger 17. 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.

[0114] Among them, the outdoor fan 15 is used to reduce the coil temperature of the outdoor heat exchanger 14, so as to accelerate the heat exchange between the heat exchanger and the external environment, and then achieve 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.

[0115] Among them, the heat storage module includes a first heat exchange water path 31 and a second heat exchange water path 32. The first heat exchange water path 31 and the second heat exchange water path 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 path 31. The second heat exchange water path 32 is connected to the user water pipeline. The first heat exchange water path 31 is used to store heat for the phase change material in the heat storage module, and the second heat exchange water path 32 is used to exchange heat with the first heat exchange water path through the phase change material.

[0116] During the process of the heat pump main unit operating in the heat storage mode, the compressor 12 outputs high-temperature and high-pressure refrigerant to the reversing device 13. Through the selected end 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 flows back to the compressor through the expansion valve 16, the outdoor heat exchanger 14, and the selected end E-S of the reversing device 13 in sequence. 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 body in the pipeline of the hydraulic module.

[0117] In the hydraulic module, water is sent to the water-fluorine heat exchanger 17 by the water pump, so that the water body in the pipeline is heated through the water-fluorine heat exchanger 17, flows through the first heat exchange water path 31 of the heat storage module, and exchanges heat with the phase change material filled in the heat storage module to achieve the purpose of heat storage, and finally flows back to the water pump 23 to participate in the next water-fluorine heat exchange.

[0118] In the heat storage module, tap water enters the second heat exchange pipeline 32 of the heat storage module through a 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.

[0119] 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 installed separately and independently. 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.

[0120] The heat storage module heat exchanger can be composed of a finned tube heat exchanger and the 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 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 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, achieving the process of heating the user water, meeting the user's demand for using hot water, and can mix water through the bypass tap water branch to control the outlet water temperature of the water use, meeting the user's demand for the water temperature of the water use.

[0121] It should be understood that during the heat storage operation of the phase change heat pump water heater, when the surrounding ambient temperature is relatively high and the user's demand for heat pump heating is relatively small, if the heat pump main unit always maintains a high heating output, it will cause the heat pump main unit to frequently reach the set temperature and stop. Although it can ensure the user's hot water use demand, the frequent start and stop lead to an increase in operating energy consumption, and the operation of the heat pump main unit is unstable.

[0122] To solve the above problems, in this embodiment, by real-time monitoring the operating frequency of the compressor in the heat pump main unit, the outlet water temperature of the hydraulic module, and the outdoor ambient temperature, different control schemes are executed for the rotational speed of the outdoor fan according to different parameters, so that the rotational speed of the outdoor fan matches the ambient temperature, the outlet water temperature, and the operating frequency, avoiding frequent reaching of the set temperature and stopping when the heat pump water heater has a small heating demand, and making the operation more reliable.

[0123] It can be understood that the ambient temperature in the area where the heat pump main unit is located can also be referred to as the outdoor ambient temperature; the outlet water temperature of the hydraulic module refers to the water temperature at the second side outlet of the water - fluorine heat exchanger in the hydraulic module. If the electric auxiliary heating device is turned on in the hydraulic module, the outlet water temperature can be the water temperature after being heated by the water - fluorine heat exchanger and the electric auxiliary heating device. Among them, both the above - mentioned ambient temperature and the outlet water temperature can be collected by a temperature acquisition device, such as a temperature sensing bulb or a temperature sensor, etc. This embodiment does not make specific limitations on this.

[0124] Adjustment module 20, configured to adjust the fan speed of the outdoor fan according to at least one of the ambient temperature, the water outlet temperature, and the operating frequency.

[0125] It should be noted that after determining the set temperature of the heat storage water tank, the heat pump water heater is started, and at the same time, the ambient temperature of the area where the heat pump host is located, the water outlet temperature of the hydraulic module, and the operating frequency of the compressor are detected, so as to adjust the fan speed of the outdoor fan in real time. During this process, the change trend of the ambient temperature can be judged first, and then according to the change trend of the ambient temperature and the temperature range where the ambient temperature is located, it can be judged which one of the ambient temperature, the water outlet temperature, or the operating frequency is used to adjust the fan speed of the outdoor fan, thereby reducing the heating output of the heat pump host and avoiding frequent temperature reaching and shutdown.

[0126] In one embodiment, the adjustment module 20 is further configured to adjust the fan speed of the outdoor fan according to the water outlet temperature and / or the operating frequency when the ambient temperature meets the first control condition; adjust the fan speed of the outdoor fan according to the operating frequency when the ambient temperature meets the second control condition; adjust the fan speed of the outdoor fan according to the ambient temperature when the ambient temperature meets the third control condition.

[0127] In one embodiment, the adjustment module 20 is further configured to adjust the fan speed of the outdoor fan according to the water outlet temperature and the water outlet temperature-wind speed mapping relationship when the water outlet temperature is on an upward trend and greater than or equal to the third temperature threshold, or when the water outlet temperature is on a downward trend and greater than or equal to the fourth temperature threshold, where the third temperature threshold is the sum of the fourth temperature threshold and the preset dead zone; adjust the fan speed of the outdoor fan according to the operating frequency and the operating frequency-wind speed mapping relationship when the water outlet temperature is on an upward trend and less than the third temperature threshold, or when the water outlet temperature is on a downward trend and less than the fourth temperature threshold.

[0128] In one embodiment, the adjustment module 20 is further configured to determine the speed range between the maximum value and the minimum value of the fan speed, and the water outlet temperature range between the maximum value and the minimum value of the water outlet temperature; associate the speed range and the water outlet temperature range according to the preset first mapping rule, the correlation between the maximum value of the fan speed and the minimum value of the water outlet temperature, and the correlation between the minimum value of the fan speed and the maximum value of the water outlet temperature, to obtain the water outlet temperature-wind speed mapping relationship.

[0129] In one embodiment, the adjustment module 20 is further configured to determine a rotation speed range between a maximum value and a minimum value of the fan rotation speed, and a frequency range between a maximum value and a minimum value of the operating frequency of the compressor; and associate the rotation speed range and the frequency range according to a preset second mapping rule, an association relationship between the maximum value of the fan rotation speed and the maximum value of the operating frequency, and an association relationship between the minimum value of the fan rotation speed and the minimum value of the operating frequency, so as to obtain an operating frequency-wind speed mapping relationship.

[0130] In one embodiment, the adjustment module 20 is further configured to adjust the fan rotation speed of the outdoor fan according to the operating frequency and the operating frequency-wind speed mapping relationship.

[0131] In one embodiment, the adjustment module 20 is further configured to adjust the fan rotation speed of the outdoor fan according to the ambient temperature and the ambient temperature-wind speed mapping relationship.

[0132] In one embodiment, the adjustment module 20 is further configured to determine a rotation speed range between a maximum value and a minimum value of the fan rotation speed, and a temperature range between a maximum value and a minimum value of the ambient temperature; and associate the rotation speed range and the temperature range according to a preset third mapping rule, an association relationship between the maximum value of the fan rotation speed and the minimum value of the ambient temperature, and an association relationship between the minimum value of the fan rotation speed and the maximum value of the ambient temperature, so as to obtain an ambient temperature-wind speed mapping relationship.

[0133] In this embodiment, when the heat pump water heater operates in a heat storage mode, the ambient temperature of the area where the heat pump host in the heat pump water heater is located, the outlet water temperature of the hydraulic module, and the operating frequency of the compressor are obtained, and the fan rotation speed of the outdoor fan is adjusted according to at least one of the ambient temperature, the outlet water temperature, and the operating frequency, so that different control strategies are adopted for the outdoor fan in different operating scenarios, so that the rotation speed of the outdoor fan corresponds to the ambient temperature, the outlet water temperature, and the operating frequency, and the operation is more stable and reliable, avoiding the technical problem that the heat pump water heater in the prior art frequently reaches the temperature and stops when the heating demand is small, and improving the user's usage requirements.

[0134] It should be understood that although the steps in the flowcharts in the embodiments of the present application are shown sequentially according to the indications of the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless there is a clear indication in this article, there is no strict order restriction for the execution of these steps, 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.

[0135] It should be understood that the above is only an example and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set it according to needs, and the present invention does not limit this.

[0136] 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.

[0137] 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, and details will not be repeated here.

[0138] In addition, it should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover a 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 expressly listed, or also includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0139] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

[0140] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described example 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 for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0141] 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 and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be 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 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, the outlet water temperature of the hydraulic module, and the operating frequency of the compressor; And Adjust the fan speed of the outdoor fan according to at least one of the ambient temperature, the outlet water temperature, and the operating frequency.

2. The control method for a heat pump water heater according to claim 1, characterized in that, The adjusting the fan speed of the outdoor fan according to at least one of the ambient temperature, the outlet water temperature, and the operating frequency includes: When the ambient temperature meets the first control condition, adjust the fan speed of the outdoor fan according to the outlet water temperature and / or the operating frequency; When the ambient temperature meets the second control condition, adjust the fan speed of the outdoor fan according to the operating frequency; and When the ambient temperature meets the third control condition, adjust the fan speed of the outdoor fan according to the ambient temperature.

3. The control method for a heat pump water heater according to claim 2, characterized in that, The first control condition includes that the ambient temperature is on the rise and the ambient temperature is greater than the first temperature threshold, or the ambient temperature is on the decline and the ambient temperature is greater than the second temperature threshold. The first temperature threshold is the sum of the second temperature threshold and the preset dead band; Correspondingly, the adjusting the fan speed of the outdoor fan according to the outlet water temperature and / or the operating frequency includes: When the outlet water temperature is on the rise and greater than or equal to the third temperature threshold, or the outlet water temperature is on the decline and greater than or equal to the fourth temperature threshold, adjust the fan speed of the outdoor fan according to the outlet water temperature and the outlet water temperature-wind speed mapping relationship. The third temperature threshold is the sum of the fourth temperature threshold and the preset dead band; And When the outlet water temperature is on the rise and less than the third temperature threshold, or the outlet water temperature is on the decline and less than the fourth temperature threshold, adjust the fan speed of the outdoor fan according to the operating frequency and the operating frequency-wind speed mapping relationship.

4. The control method for a heat pump water heater according to claim 3, characterized in that, Before adjusting the fan speed of the outdoor fan according to the outlet water temperature and the outlet water temperature-wind speed mapping relationship, it further includes: Determine the speed range between the maximum value and the minimum value of the fan speed, and the outlet water temperature range between the maximum value and the minimum value of the outlet water temperature; and According to the preset first mapping rule, the correlation between the maximum value of the fan speed and the minimum value of the water outlet temperature, and the correlation between the minimum value of the fan speed and the maximum value of the water outlet temperature, the rotation speed interval and the water outlet temperature interval are correlated to obtain a water outlet temperature - wind speed mapping relationship.

5. The control method for a heat pump water heater according to claim 3, characterized in that, Before adjusting the fan speed of the outdoor fan according to the operating frequency and the operating frequency - wind speed mapping relationship, it further includes: Determining the rotation speed interval between the maximum value and the minimum value of the fan speed, and the frequency interval between the maximum value and the minimum value of the operating frequency of the compressor; and According to the preset second mapping rule, the correlation between the maximum value of the fan speed and the maximum value of the operating frequency, and the correlation between the minimum value of the fan speed and the minimum value of the operating frequency, the rotation speed interval and the frequency interval are correlated to obtain an operating frequency - wind speed mapping relationship.

6. The control method for a heat pump water heater according to claim 2, characterized in that, The second control condition includes that the ambient temperature is in an upward trend, and the ambient temperature is less than or equal to the first temperature threshold and greater than the fifth temperature threshold, or the ambient temperature is in a downward trend, and the ambient temperature is less than or equal to the second temperature threshold and greater than the sixth temperature threshold, where the fifth temperature threshold is the sum of the sixth temperature threshold and the preset dead band; Correspondingly, adjusting the fan speed of the outdoor fan according to the operating frequency includes: Adjusting the fan speed of the outdoor fan according to the operating frequency and the operating frequency - wind speed mapping relationship.

7. The control method for a heat pump water heater according to claim 2, characterized in that, The third control condition includes that the ambient temperature is in an upward trend and the ambient temperature is less than or equal to the fifth temperature threshold, or the ambient temperature is in a downward trend and the ambient temperature is less than or equal to the sixth temperature threshold; Correspondingly, adjusting the fan speed of the outdoor fan according to the ambient temperature includes: Adjusting the fan speed of the outdoor fan according to the ambient temperature and the ambient temperature - wind speed mapping relationship.

8. The control method for a heat pump water heater according to claim 7, characterized in that, Before adjusting the fan speed of the outdoor fan according to the ambient temperature and the ambient temperature - wind speed mapping relationship, it further includes: Determining the rotation speed interval between the maximum value and the minimum value of the fan speed, and the temperature interval between the maximum value and the minimum value of the ambient temperature; and According to the preset third mapping rule, the correlation between the maximum value of the fan speed and the minimum value of the ambient temperature, and the correlation between the minimum value of the fan speed and the maximum value of the ambient temperature, the rotation speed interval and the temperature interval are correlated to obtain an ambient temperature - wind speed mapping relationship.

9. 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 acquire the ambient temperature of the area where the heat pump host is located, the water outlet temperature of the hydraulic module, and the operating frequency of the compressor when the heat pump water heater operates in a heat storage mode; An adjustment module, configured to adjust the fan speed of the outdoor fan according to at least one of the ambient temperature, the water outlet temperature, and the operating frequency.

10. 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, the heat pump water heater control program being configured to implement the heat pump water heater control method according to any one of claims 1 to 8.

11. 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 8.

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