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

Abstract

The invention relates to the technical field of 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, exhaust data of a compressor and the corresponding exhaust data change trend are obtained; and when the exhaust data meet the preset protection condition, the heating output of the heat pump water heater is adjusted according to the exhaust data and the exhaust threshold value corresponding to the exhaust data change trend, and the heating output of the heat pump water heater is adjusted by determining the size relation between the exhaust data and the exhaust threshold value corresponding to the exhaust data change trend. Whether the heating output of the heat pump water heater needs to be adjusted or not is judged, fault protection caused by too large heating output of the heat pump water heater is avoided, and the water using stability of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 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 main unit, so that the water in the water tank maintains a relatively high water temperature for users to use. If the heating output of the heat pump water heater is inconsistent with the heating demand of the user, it will affect the user experience, and even cause the heat pump water heater to malfunction and be damaged. For example, if the environmental temperature in the area where the 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 main unit to have a fault protection, affecting its service life; when the environmental temperature in the area where the water heater is located is relatively low and the user's demand for hot water is large, if the heat pump output is small and cannot meet the user's heating demand, it will seriously affect 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 low reliability due to the inconsistency between the heating demand of the heat pump water heater in the prior art and the user's usage demand.

[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 gas-liquid separator, 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 flow switch, a water pump, and an expansion tank. The heat pump main unit is connected to the hydraulic module through a 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 water pipeline. The first heat exchange water circuit is used for heat storage, and the second heat exchange water circuit is used for heat exchange with the first heat exchange water circuit;

[0006] The method includes the following steps:

[0007] When the heat pump water heater operates in a heat storage mode, obtain the exhaust data of the compressor and the corresponding exhaust data change trend;

[0008] When the exhaust data meets the preset protection conditions, adjust the heating output of the heat pump water heater according to the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data.

[0009] Optionally, the exhaust data includes: exhaust temperature and / or exhaust pressure;

[0010] The adjusting the heating output of the water heater according to the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data includes:

[0011] When the exhaust temperature or the exhaust pressure is on the rise, determine the first temperature threshold corresponding to the exhaust temperature, or the first pressure threshold corresponding to the exhaust pressure;

[0012] When the exhaust temperature is less than the first temperature threshold, or the exhaust pressure is less than the first pressure threshold, maintain the conventional control of the operating frequency of the compressor and the fan speed of the outdoor fan;

[0013] When the exhaust temperature is greater than or equal to the first temperature threshold, or the exhaust pressure is greater than or equal to the first pressure threshold, reduce the operating frequency of the compressor and / or the fan speed of the outdoor fan.

[0014] Optionally, the reducing the operating frequency of the compressor and / or the fan speed of the outdoor fan includes:

[0015] Reduce the operating frequency of the compressor according to the preset frequency reduction strategy; when the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor, reduce the fan speed of the outdoor fan according to the preset speed reduction strategy until the fan speed of the outdoor fan is less than or equal to the minimum fan speed; or

[0016] Reduce the fan speed of the outdoor fan according to the preset speed reduction strategy; when the current fan speed of the outdoor fan is less than or equal to the minimum fan speed of the outdoor fan, reduce the operating frequency of the compressor according to the preset frequency reduction strategy until the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor; or

[0017] Reduce the fan speed of the outdoor fan according to the preset speed reduction strategy until the fan speed of the outdoor fan is less than or equal to the minimum fan speed, and reduce the operating frequency of the compressor according to the preset frequency reduction strategy until the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor.

[0018] Optionally, the adjusting the heating output of the water heater according to the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data further includes:

[0019] When the exhaust gas temperature or the exhaust gas pressure is in a downward trend, determine the second temperature threshold corresponding to the exhaust gas temperature or the second pressure threshold corresponding to the exhaust gas pressure;

[0020] When the exhaust gas temperature is less than the second temperature threshold or the exhaust gas pressure is less than the second pressure threshold, maintain the conventional control of the operating frequency of the compressor and the fan speed of the outdoor fan;

[0021] When the exhaust gas temperature is greater than or equal to the second temperature threshold or the exhaust gas pressure is greater than or equal to the second pressure threshold, determine the magnitude relationship of the temperature value between the exhaust gas temperature and the third temperature threshold, or the magnitude relationship of the pressure value between the exhaust gas pressure and the third pressure threshold;

[0022] Adjust the operating frequency of the compressor and / or the fan speed of the outdoor fan according to the magnitude relationship of the temperature value or the magnitude relationship of the pressure value.

[0023] Optionally, the adjusting the operating frequency of the compressor and / or the fan speed of the outdoor fan according to the magnitude relationship of the temperature value or the magnitude relationship of the pressure value includes:

[0024] When the exhaust gas temperature is greater than or equal to the second temperature threshold and less than the third temperature threshold, or the exhaust gas pressure is greater than or equal to the second pressure threshold and less than the third pressure threshold, increase the operating frequency of the compressor and / or the fan speed of the outdoor fan;

[0025] When the exhaust gas temperature is greater than or equal to the third temperature threshold or the exhaust gas pressure is greater than or equal to the third pressure threshold, maintain the operating frequency of the compressor and the fan speed of the outdoor fan unchanged.

[0026] Optionally, the increasing the operating frequency of the compressor and / or the fan speed of the outdoor fan includes:

[0027] Increase the operating frequency of the compressor according to a preset frequency increase strategy; when the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor, increase the fan speed of the outdoor fan according to a preset speed increase strategy until the fan speed of the outdoor fan is greater than or equal to the maximum fan speed; or

[0028] Increase the fan speed of the outdoor fan according to a preset speed increase strategy; when the current fan speed of the outdoor fan is greater than or equal to the maximum fan speed of the outdoor fan, increase the operating frequency of the compressor according to a preset frequency increase strategy until the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor; or

[0029] Increase the fan speed of the outdoor fan according to a preset speed-up strategy until the fan speed of the outdoor fan is greater than or equal to the maximum fan speed, and increase the operating frequency of the compressor according to a preset frequency-increase strategy until the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor.

[0030] Optionally, the preset protection conditions include: the exhaust temperature is less than a preset temperature threshold, or the exhaust pressure is less than a preset pressure threshold.

[0031] In addition, to achieve the above object, the present invention also provides a heat pump water heater control device, which includes:

[0032] An acquisition module, configured to acquire the exhaust data of the compressor and the corresponding change trend of the exhaust data when the heat pump water heater operates in a heat storage mode;

[0033] An adjustment module, configured to adjust the heating output of the heat pump water heater according to the exhaust threshold corresponding to the exhaust data and the change trend of the exhaust data when the exhaust data meets the preset protection conditions.

[0034] In addition, to achieve the above object, the present invention also provides a heat pump water heater, which 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.

[0035] In addition, to achieve the above object, the present invention also 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, it implements the steps of the heat pump water heater control method as described above.

[0036] When the heat pump water heater operates in a heat storage mode, the present invention acquires the exhaust data of the compressor and the corresponding change trend of the exhaust data; when the exhaust data meets the preset protection conditions, it adjusts the heating output of the heat pump water heater according to the exhaust threshold corresponding to the exhaust data and the change trend of the exhaust data. By determining the magnitude relationship between the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data, it judges whether it is necessary to adjust the heating output of the heat pump water heater, avoids the heat pump water heater from causing fault protection due to excessive heating output, and improves the stability of user water use. Description of the Drawings

[0037] Figure 1 It is a schematic structural diagram of a heat pump water heater in the hardware operating environment related to the embodiment solution of the present invention;

[0038] Figure 2Schematic flow chart of the first embodiment of the control method for the heat pump water heater of the present invention;

[0039] Figure 3 Schematic structural diagram of the heat pump water heater of the first embodiment of the control method for the heat pump water heater of the present invention;

[0040] Figure 4 Schematic flow chart of the second embodiment of the control method for the heat pump water heater of the present invention;

[0041] Figure 5 Schematic flow chart of the third embodiment of the control method for the heat pump water heater of the present invention;

[0042] Figure 6 Block diagram of the structure of the first embodiment of the control device for the heat pump water heater of the present invention.

[0043] Description 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, 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 embodiments

[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 Schematic structural diagram of the heat pump water heater of the hardware operating environment involved in the embodiment solution of the present invention.

[0048] As Figure 1As shown in the figure, 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 and an input unit such as a 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 (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.

[0049] Those skilled in the art can understand that Figure 1 the structure shown in the figure does not constitute a limitation on the heat pump water heater, and it may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0050] 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.

[0051] In Figure 1 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 users; the processor 1001 and the memory 1005 in the heat pump water heater of the present invention may 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] The embodiments of the present invention provide a heat pump water heater control method. Referring to Figure 2 , Figure 2 it 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 exhaust data of the compressor and the corresponding change trend of the exhaust data.

[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 water heater or the water heater unit equipped 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 taken 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 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.

[0057] 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.

[0058] 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.

[0059] 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 then 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 of 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, 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 path 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 returns to the expansion tank 24 or 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 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.

[0062] 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.

[0063] The heat exchanger of the heat storage module can be composed of a finned tube heat exchanger and the phase change material filled in its gaps. The finned tube heat exchanger has two water paths. One is connected to the hydraulic module, and the hot water provided by the hydraulic module pipeline flows through the heat exchanger of the heat storage module 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 path in the heat exchanger of the heat storage module, 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 the mixing water can be controlled 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 noted 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 heat pump heating is relatively small, if the heat pump host always maintains a high heating output, it may trigger fault protection. Although it can ensure the safety of the heat pump water heater and the user and meet the user's hot water usage requirements, after the fault protection is triggered, restarting the water heater will increase the operating energy consumption, and the operation of the heat pump host is unstable.

[0065] It can be understood that the exhaust data of the compressor refers to the exhaust temperature and / or exhaust pressure of the refrigerant at the refrigerant outlet of the compressor. During the operation of the compressor, the refrigerant outlet outputs high-temperature and high-pressure gaseous refrigerant. After the high-temperature and high-pressure gaseous refrigerant passes through the heat exchanger and the expansion valve, it becomes low-temperature and low-pressure gas. Generally, the higher the exhaust temperature or exhaust pressure of the refrigerant, the greater the heating output of the water heater; the lower the exhaust temperature or exhaust pressure of the refrigerant, the smaller the heating output of the water heater. Therefore, in this embodiment, the operation state of the heat pump water heater is adjusted according to the change of the exhaust temperature and / or exhaust pressure to avoid a large difference between the heat demand and the heating output.

[0066] Step S20: When the exhaust data meets the preset protection condition, adjust the heating output of the heat pump water heater according to the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data.

[0067] It should be understood that the preset protection condition means that the exhaust temperature is less than the preset temperature threshold, or the exhaust pressure is less than the preset pressure threshold. The preset temperature threshold and the preset pressure threshold are the limit temperature and limit pressure corresponding to the operation of the heat pump water heater. In this embodiment, the heat pump water heater meeting the preset protection condition means avoiding the overloading operation of the heat pump water heater. If the exhaust temperature is greater than its normal operating temperature range or the exhaust pressure is greater than its normal operating pressure range, the heat pump water heater is in an over-limit operating state and may damage the equipment. Therefore, in this embodiment, when the exhaust temperature is less than the preset temperature threshold, or the exhaust pressure is less than the preset pressure threshold, it is considered whether to adjust the heating output of the heat pump water heater. Among them, the value range of the preset temperature threshold is 10 - 130 °C, preferably 115 °C, and the preset pressure threshold varies according to different refrigerants. The corresponding value range of the preset pressure threshold is 2.0 - 4.6 MPa, preferably 4.2 MPa. This embodiment does not make specific limitations on this.

[0068] If the exhaust gas temperature is greater than or equal to the preset temperature threshold, or the exhaust gas pressure is less than or equal to the preset pressure threshold, the heat pump water heater can be controlled to enter the protection shutdown to avoid overloading and damaging the equipment. That is, when the exhaust gas temperature is less than 115°C, or the exhaust gas pressure is less than 4.2 MPa, the heating output of the heat pump water heater is adjusted according to the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data; when the exhaust gas temperature is greater than or equal to 115°C, or the exhaust gas pressure is greater than or equal to 4.2 MPa, the heat pump water heater is controlled to enter the protection shutdown mode.

[0069] When adjusting the heating output of the heat pump water heater, if the exhaust gas temperature or the exhaust gas pressure is greater than a certain threshold, it is necessary to consider whether the heating output of the water heater is too large, which may cause fault protection. And due to the influence of refrigerant reflux, environmental factors, etc., when the exhaust gas temperature and / or the exhaust gas pressure are in different change trends, the corresponding judgment thresholds are different. In this embodiment, the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data are comprehensively considered to determine whether it is necessary to adjust the heating output of the heat pump water heater, improving the stability of the heat pump water heater control.

[0070] At the same time, when adjusting the heating output of the heat pump water heater, if the exhaust gas temperature or the exhaust gas pressure is less than a certain threshold, it is necessary to consider whether the heating output of the water heater is too small to meet the user's usage requirements and affect the reliability of the water heater. At this time, the heating output of the heat pump water heater can be increased to improve the reliability of the water heater operation.

[0071] In this embodiment, when the heat pump water heater operates in the heat storage mode, the exhaust data of the compressor and the corresponding change trend of the exhaust data are obtained; when the exhaust data meet the preset protection conditions, the heating output of the heat pump water heater is adjusted according to the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data. By determining the magnitude relationship between the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data, it is judged whether it is necessary to adjust the heating output of the heat pump water heater, avoiding the heat pump water heater from causing fault protection due to excessive heating output and improving the stability of user water use.

[0072] 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.

[0073] Based on the above first embodiment, in this embodiment, the step S20 includes:

[0074] Step S201: When the exhaust gas temperature or the exhaust gas pressure is in an upward trend, determine the first temperature threshold corresponding to the exhaust gas temperature, or the first pressure threshold corresponding to the exhaust gas pressure.

[0075] Step S202: When the exhaust temperature is less than the first temperature threshold or the exhaust pressure is less than the first pressure threshold, maintain the normal control of the operating frequency of the compressor and the fan speed of the outdoor fan.

[0076] In specific implementation, if the exhaust temperature is less than the first temperature threshold or the exhaust pressure is less than the first pressure threshold, it means that when the exhaust data is on an upward trend, the heating energy demand is insufficient to trigger the preset protection condition. At this time, the normal control of the operating frequency of the compressor and the fan speed of the outdoor fan can be maintained to meet the heating output requirements of the heat pump water heater.

[0077] Specifically, maintaining the normal control of the operating frequency of the compressor and the fan speed of the outdoor fan means a control mode that normally controls the operating frequency of the compressor and the fan speed of the outdoor fan according to the current operating mode of the current air conditioner and the set parameters, etc.

[0078] Step S203: When the exhaust temperature is greater than or equal to the first temperature threshold or the exhaust pressure is greater than or equal to the first pressure threshold, reduce the operating frequency of the compressor and / or the fan speed of the outdoor fan.

[0079] In specific implementation, if the exhaust temperature is less than the first temperature threshold or the exhaust pressure is less than the first pressure threshold, it means that when the exhaust data is on an upward trend, the heating energy demand may trigger the preset protection condition. Therefore, in this embodiment, the heating output of the heat pump water heater can be reduced by reducing the operating frequency of the compressor and / or the fan speed of the outdoor fan to avoid fault shutdown.

[0080] Furthermore, reducing the operating frequency of the compressor and / or the fan speed of the outdoor fan includes:

[0081] Reducing the operating frequency of the compressor according to a preset frequency reduction strategy; when the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor, reducing the fan speed of the outdoor fan according to a preset speed reduction strategy until the fan speed of the outdoor fan is less than or equal to the minimum fan speed; or

[0082] Reducing the fan speed of the outdoor fan according to a preset speed reduction strategy; when the current fan speed of the outdoor fan is less than or equal to the minimum fan speed of the outdoor fan, reducing the operating frequency of the compressor according to a preset frequency reduction strategy until the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor; or

[0083] Reduce the fan speed of the outdoor fan according to a preset speed reduction strategy until the fan speed of the outdoor fan is less than or equal to the minimum fan speed, and reduce the operating frequency of the compressor according to a preset frequency reduction strategy until the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor.

[0084] It can be understood that the preset frequency reduction strategy means reducing the current operating frequency by 10% in each adjustment cycle, and the preset speed reduction strategy means reducing the current fan speed of the outdoor fan by 10% in each adjustment cycle. That is, if the current operating frequency of the compressor in the current cycle is 100 Hz, then the operating frequency of the compressor in the next adjustment cycle is 90 Hz. This embodiment does not make specific limitations on this.

[0085] In this embodiment, when reducing the fan speed of the outdoor fan or the operating frequency of the compressor, three methods can be adopted. The first method is: give priority to frequency reduction adjustment. When performing frequency reduction adjustment, reduce the frequency at a certain rate in each adjustment cycle, then perform protection judgment, and proceed to the next cycle. If the frequency drops to the minimum frequency and there is still a need to reduce the output, then continue to reduce the wind speed at a certain rate in each adjustment cycle until the lowest wind speed; that is, if the current operating frequency of the compressor in the current cycle is 60 Hz and the current fan speed of the outdoor fan is 500 r / min, then the operating frequency of the compressor in the next adjustment cycle is 54 Hz, and the fan speed remains 500 r / min unchanged until the operating frequency of the compressor is reduced to the minimum operating frequency, and then the fan speed is reduced.

[0086] The second method is: give priority to reducing the wind speed adjustment. When reducing the wind speed adjustment, reduce the wind speed at a certain rate in each adjustment cycle, then perform protection judgment, and proceed to the next cycle. If the wind speed is adjusted to the lowest wind speed and there is still a need to reduce the output, then continue to reduce the frequency at a certain rate in each adjustment cycle until the minimum frequency. That is, if the current operating frequency of the compressor in the current cycle is 60 Hz and the current fan speed of the outdoor fan is 500 r / min, then the fan speed in the next adjustment cycle is 450 r / min, and the operating frequency remains 60 Hz unchanged until the speed of the outdoor fan is reduced to the lowest speed, and then the operating frequency of the compressor is reduced.

[0087] The third method is: reduce the frequency and the wind speed simultaneously. Reduce the frequency and the wind speed at a certain rate in each adjustment cycle, then perform protection judgment, and proceed to the next cycle. If the frequency drops to the minimum frequency and there is still a need to reduce the output, then continue to reduce the wind speed at a certain rate in each adjustment cycle until the lowest wind speed. Among them, the adjustment of the operating frequency or the fan speed does not affect each other. That is, if one of them reaches the lowest value, but the other parameter does not reach the lowest value, and if the condition of reducing the heating output of the heat pump water heater is still satisfied at this time, the other parameter can be continued to be adjusted until the lowest value is reached.

[0088] In this embodiment, when the exhaust temperature or exhaust pressure is on the rise, by determining whether the exhaust temperature or exhaust pressure meets the condition for reducing the heating demand of the heat pump water heater, if it meets, the heating output of the heat pump water heater can be reduced by any one of preferentially adjusting the operating frequency of the compressor, preferentially adjusting the fan speed of the outdoor fan, and simultaneously adjusting the operating frequency and the fan speed, so as to avoid equipment failures.

[0089] Reference Figure 5 , Figure 5 is a schematic flowchart of the third embodiment of a control method for a heat pump water heater according to the present invention.

[0090] Based on the above second embodiment, in this embodiment, the step S20 includes:

[0091] Step S201`: When the exhaust temperature or exhaust pressure is on the decline, determine the second temperature threshold corresponding to the exhaust temperature or the second pressure threshold corresponding to the exhaust pressure.

[0092] It should be noted that when the exhaust temperature or exhaust pressure is on the rise, compared with when the exhaust temperature or exhaust pressure is on the decline, it is more likely that the heat pump water heater will experience fault protection due to the heating output being greater than the heating demand. Therefore, in this embodiment, the first temperature threshold corresponding to the rising trend is greater than the second temperature threshold corresponding to the declining trend, and the first temperature threshold is greater than the second temperature threshold. The value ranges of the first temperature threshold and the second temperature threshold are 10 - 130 °C. The first temperature threshold is preferably 110 °C, and the second temperature threshold is preferably 80 °C, and the first temperature threshold is less than the preset temperature threshold. Similarly, the first pressure threshold is less than the preset pressure threshold. The first pressure threshold can be set to 4.0 MPa, and the second pressure threshold can be set to 3.8 MPa. The above parameters are only for illustrative purposes, and this embodiment does not make specific limitations on this.

[0093] Step S202`: When the exhaust temperature is less than the second temperature threshold or the exhaust pressure is less than the second pressure threshold, maintain the conventional control of the operating frequency of the compressor and the fan speed of the outdoor fan.

[0094] In specific implementation, if the exhaust temperature is less than the second temperature threshold or the exhaust pressure is less than the second pressure threshold, it means that in the case where the exhaust data is on the rise, the heating energy demand is insufficient to trigger the preset protection condition. At this time, the conventional control of the operating frequency of the compressor and the fan speed of the outdoor fan can be maintained to meet the heating output demand of the heat pump water heater.

[0095] Step S203`: When the exhaust gas temperature is greater than or equal to the second temperature threshold, or the exhaust gas pressure is greater than or equal to the second pressure threshold, determine the magnitude relationship of the temperature value between the exhaust gas temperature and the third temperature threshold, or the magnitude relationship of the pressure value between the exhaust gas pressure and the third pressure threshold.

[0096] It can be understood that the third temperature threshold is greater than the second temperature threshold but less than the first temperature threshold, that is, the second temperature threshold < the third temperature threshold < the first temperature threshold. Similarly, the second pressure threshold < the third pressure threshold < the first pressure threshold.

[0097] Step S204`: Adjust the operating frequency of the compressor and / or the fan speed of the outdoor fan according to the magnitude relationship of the temperature value or the magnitude relationship of the pressure value.

[0098] Since the exhaust gas temperature and / or the exhaust gas pressure is in a downward trend in this embodiment, if the exhaust gas temperature is greater than or equal to the second temperature threshold, or the exhaust gas pressure is greater than or equal to the second pressure threshold, it is possible that in the next cycle, the heating output of the heat pump water heater will decrease compared to the current cycle and is not sufficient to trigger the preset protection condition. In order to achieve precise control of the heat pump water heater and reduce energy consumption, a third temperature threshold and a third pressure threshold can also be set in this embodiment to accurately determine whether there may be a possible fault.

[0099] Further, the adjusting the operating frequency of the compressor and / or the fan speed of the outdoor fan according to the magnitude relationship of the temperature value or the magnitude relationship of the pressure value includes:

[0100] When the exhaust gas temperature is greater than or equal to the second temperature threshold and less than the third temperature threshold, or the exhaust gas pressure is greater than or equal to the second pressure threshold and less than the third pressure threshold, increase the operating frequency of the compressor and / or the fan speed of the outdoor fan;

[0101] When the exhaust gas temperature is greater than or equal to the third temperature threshold, or the exhaust gas pressure is greater than or equal to the third pressure threshold, keep the operating frequency of the compressor and the fan speed of the outdoor fan unchanged.

[0102] In specific implementation, if the exhaust gas temperature is less than the third temperature threshold, or the exhaust gas pressure is less than the third pressure threshold, it means that the heating output cannot meet the user's needs when the exhaust gas data is in a downward trend. Therefore, in this embodiment, the operating frequency of the compressor and / or the fan speed of the outdoor fan can be increased to increase the heating output of the heat pump water heater and meet the user's hot water heating demand.

[0103] Further, the increasing the operating frequency of the compressor and / or the fan speed of the outdoor fan includes:

[0104] Increase the operating frequency of the compressor according to a preset frequency increase strategy; when the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor, increase the fan speed of the outdoor fan according to a preset speed increase strategy until the fan speed of the outdoor fan is greater than or equal to the maximum fan speed; or

[0105] Increase the fan speed of the outdoor fan according to a preset speed increase strategy; when the current fan speed of the outdoor fan is greater than or equal to the maximum fan speed of the outdoor fan, increase the operating frequency of the compressor according to a preset frequency increase strategy until the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor; or

[0106] Increase the fan speed of the outdoor fan according to a preset speed increase strategy until the fan speed of the outdoor fan is greater than or equal to the maximum fan speed, and increase the operating frequency of the compressor according to a preset frequency increase strategy until the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor.

[0107] It can be understood that the preset frequency increase strategy means increasing the current operating frequency by 10% in each adjustment cycle, and the preset speed increase strategy means increasing the current fan speed of the outdoor fan by 10% in each adjustment cycle. That is, if the current operating frequency of the compressor in the current cycle is 60Hz, then the operating frequency of the compressor in the next adjustment cycle is 66Hz. This embodiment does not make specific limitations on this.

[0108] In this embodiment, when increasing the fan speed of the outdoor fan or the operating frequency of the compressor, three methods can be adopted. The first method is: prioritize frequency increase adjustment. When performing frequency increase adjustment, perform frequency increase adjustment at a certain rate in each adjustment cycle, then perform protection judgment, and proceed to the next cycle. If there is still a need to increase the heating output when the frequency has been increased to the maximum frequency, then continue to increase the wind speed at a certain rate in each adjustment cycle until the maximum wind speed; that is, if the current operating frequency of the compressor in the current cycle is 60Hz and the current fan speed of the outdoor fan is 500r / min, then the operating frequency of the compressor in the next adjustment cycle is 66Hz, and the fan speed remains unchanged at 500r / min until the operating frequency of the compressor is increased to the minimum operating frequency, and then the fan speed is increased.

[0109] The second method is as follows: Priority is given to increasing the wind speed adjustment. When increasing the wind speed adjustment, the wind speed is increased at a certain rate in each adjustment cycle, and then the protection judgment is carried out. Then, the next cycle is entered. If the wind speed is adjusted to the maximum wind speed and there is still a need to increase the heating output, then the frequency is increased at a certain rate in each adjustment cycle until the maximum frequency. That is, the current operating frequency of the compressor in the current cycle is 60 Hz, and the current fan speed of the outdoor fan is 500 r / min. Then, the fan speed in the next adjustment cycle is 550 r / min, and the operating frequency remains unchanged at 60 Hz until the fan speed of the outdoor fan is increased to the maximum speed, and then the operating frequency of the compressor is increased.

[0110] The third method is as follows: The frequency and the wind speed are increased simultaneously. The frequency is increased and the wind speed is increased at a certain rate in each adjustment cycle, and then the protection judgment is carried out. Then, the next cycle is entered. If the frequency is increased to the maximum frequency and there is still a need to increase the heating output, then the wind speed is increased at a certain rate in each adjustment cycle until the maximum wind speed. Among them, the adjustment of the operating frequency or the fan speed does not affect each other. That is, if one of them reaches the maximum value but the other parameter does not reach the maximum value, and if the condition for increasing the heating output of the heat pump water heater is still satisfied at this time, the other parameter can be continued to be adjusted until the maximum value is reached.

[0111] In this embodiment, when the exhaust temperature or the exhaust pressure is in a downward trend, by judging whether the exhaust temperature or the exhaust pressure meets the condition for increasing the heating demand of the heat pump water heater, if it does not meet, then according to any one of the methods of preferentially adjusting the operating frequency of the compressor, preferentially adjusting the fan speed of the outdoor fan, and simultaneously adjusting the operating frequency and the fan speed, the heating output of the heat pump water heater is increased to meet the user's hot water production demand.

[0112] In addition, an embodiment of the present invention further 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.

[0113] 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.

[0114] Refer to Figure 6 , Figure 6 which is the structural block diagram of the first embodiment of the heat pump water heater control device of the present invention.

[0115] As Figure 6 shown, the heat pump water heater control device proposed by the embodiment of the present invention includes:

[0116] An acquisition module 100 is configured to acquire the exhaust data of the compressor and the corresponding changing trend of the exhaust data when the heat pump water heater operates in a heat storage mode.

[0117] It should be noted that the heat pump water heater mentioned in this embodiment and the following embodiments refers to a 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 pump 23, and an expansion tank 24. 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 a water-fluorine heat exchanger 17.

[0118] 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.

[0119] 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.

[0120] 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 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 of the hydraulic module.

[0121] In the hydraulic module, water is supplied to the water-fluorine heat exchanger 17 by a water pump, so that the water body in the pipeline passes through the water-fluorine heat exchanger 17 for heating, and then flows through the first heat exchange water path 31 of the heat storage module through the electric auxiliary heating device 21 and the water flow switch 22 in sequence, realizing heat exchange with the phase change material filled in the heat storage module to achieve the purpose of heat storage. Finally, it returns to the expansion tank 24 or the water pump 23 to participate in the next water-fluorine heat exchange.

[0122] In the heat storage module, tap water enters the second heat exchange water path 32 of the heat storage module through the one-way valve in the user water pipeline. The second heat exchange water path 32 exchanges heat with the phase change material filled in the heat storage module to raise the temperature of the user's water.

[0123] 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 single heat storage module, or the heat storage module and the hydraulic part can together form a heat storage water tank.

[0124] The heat exchanger of the heat storage module can be composed of a finned tube heat exchanger and the phase change material filled in its gaps. There are two water paths 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 exchanger of the heat storage module 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 path in the heat exchanger of the heat storage module, realizing the heat release of the phase change material, achieving the process of raising the temperature of the user's water, meeting 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.

[0125] It should be noted that during the heat storage operation of the phase change heat pump water heater, when the surrounding environmental temperature is relatively high and the user's demand for the heating capacity of the heat pump is relatively small, if the heat pump host always maintains a high heating output, it may trigger fault protection. Although it can ensure the safety of the heat pump water heater and the user and meet the user's hot water use demand, after the fault protection is triggered, restarting the water heater will lead to an increase in operating energy consumption, and the operation of the heat pump host is unstable.

[0126] It can be understood that the exhaust data of the compressor refers to the exhaust temperature and / or exhaust pressure of the refrigerant at the refrigerant outlet of the compressor. During the operation of the compressor, the output at the refrigerant outlet is high-temperature and high-pressure gaseous refrigerant. After passing through the heat exchanger and expansion valve, the high-temperature and high-pressure gaseous refrigerant becomes low-temperature and low-pressure gas. Generally, the higher the exhaust temperature or exhaust pressure of the refrigerant, the greater the heating output of the water heater; the lower the exhaust temperature or exhaust pressure of the refrigerant, the smaller the heating output of the water heater. Therefore, in this embodiment, the operating state of the heat pump water heater is adjusted according to the changes in the exhaust temperature and / or exhaust pressure to avoid a large difference between the heating energy demand and the heating output.

[0127] The adjustment module 200 is configured to adjust the heating output of the heat pump water heater according to the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data when the exhaust data meets the preset protection condition.

[0128] It should be understood that the preset protection condition means that the exhaust temperature is less than the preset temperature threshold or the exhaust pressure is less than the preset pressure threshold. If the exhaust temperature is too high or the exhaust pressure is too high, it may damage the equipment. Therefore, in this embodiment, when the exhaust temperature is less than the preset temperature threshold or the exhaust pressure is less than the preset pressure threshold, it is considered whether to adjust the heating output of the heat pump water heater. Among them, the value range of the preset temperature threshold is 10 - 130 °C, preferably 115 °C, and the value range of the preset pressure threshold is 2.0 - 4.6 MPa, preferably 4.2 MPa. This embodiment does not make specific limitations on this.

[0129] If the exhaust temperature is greater than or equal to the preset temperature threshold or the exhaust pressure is less than or equal to the preset pressure threshold, the heat pump water heater can be controlled to enter the protection shutdown to avoid equipment damage, that is, when the exhaust temperature is less than 115 °C or the exhaust pressure is less than 4.2 MPa, the heating output of the heat pump water heater is adjusted according to the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data; when the exhaust temperature is greater than or equal to 115 °C or the exhaust pressure is greater than or equal to 4.2 MPa, the heat pump water heater is controlled to enter the protection shutdown mode.

[0130] When adjusting the heating output of the heat pump water heater, if the exhaust temperature or exhaust pressure is greater than a certain threshold, it is necessary to consider whether the heating output of the water heater is too large, which may cause fault protection. And due to the influence of refrigerant reflux, environmental factors, etc., when the exhaust temperature and / or exhaust pressure are in different change trends, the corresponding judgment thresholds are different. This embodiment comprehensively considers the exhaust data and the exhaust threshold corresponding to the change trend of the exhaust data to judge whether to adjust the heating output of the heat pump water heater, improving the stability of the heat pump water heater control.

[0131] In one embodiment, the adjustment module 200 is further configured to determine a first temperature threshold corresponding to the exhaust gas temperature or a first pressure threshold corresponding to the exhaust gas pressure when the exhaust gas temperature or the exhaust gas pressure is on an upward trend; when the exhaust gas temperature is less than the first temperature threshold or the exhaust gas pressure is less than the first pressure threshold, maintain the conventional control of the operating frequency of the compressor and the fan speed of the outdoor fan; when the exhaust gas temperature is greater than or equal to the first temperature threshold or the exhaust gas pressure is greater than or equal to the first pressure threshold, reduce the operating frequency of the compressor and / or the fan speed of the outdoor fan.

[0132] In one embodiment, the adjustment module 200 is further configured to reduce the operating frequency of the compressor according to a preset frequency reduction strategy; when the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor, reduce the fan speed of the outdoor fan according to a preset speed reduction strategy until the fan speed of the outdoor fan is less than or equal to the minimum fan speed; or reduce the fan speed of the outdoor fan according to a preset speed reduction strategy; when the current fan speed of the outdoor fan is less than or equal to the minimum fan speed of the outdoor fan, reduce the operating frequency of the compressor according to a preset frequency reduction strategy until the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor; or reduce the fan speed of the outdoor fan according to a preset speed reduction strategy until the fan speed of the outdoor fan is less than or equal to the minimum fan speed, and reduce the operating frequency of the compressor according to a preset frequency reduction strategy until the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor.

[0133] In one embodiment, the adjustment module 200 is further configured to determine a second temperature threshold corresponding to the exhaust gas temperature or a second pressure threshold corresponding to the exhaust gas pressure when the exhaust gas temperature or the exhaust gas pressure is on a downward trend; when the exhaust gas temperature is less than the second temperature threshold or the exhaust gas pressure is less than the second pressure threshold, maintain the conventional control of the operating frequency of the compressor and the fan speed of the outdoor fan; when the exhaust gas temperature is greater than or equal to the second temperature threshold or the exhaust gas pressure is greater than or equal to the second pressure threshold, determine the magnitude relationship between the temperature value of the exhaust gas temperature and a third temperature threshold or the magnitude relationship between the pressure value of the exhaust gas pressure and a third pressure threshold; adjust the operating frequency of the compressor and / or the fan speed of the outdoor fan according to the temperature magnitude relationship or the pressure magnitude relationship.

[0134] In one embodiment, the adjustment module 200 is further configured to increase the operating frequency of the compressor and / or the fan speed of the outdoor fan when the exhaust temperature is greater than or equal to the second temperature threshold and less than the third temperature threshold, or the exhaust pressure is greater than or equal to the second pressure threshold and less than the third pressure threshold; and maintain the operating frequency of the compressor and the fan speed of the outdoor fan unchanged when the exhaust temperature is greater than or equal to the third temperature threshold, or the exhaust pressure is greater than or equal to the third pressure threshold.

[0135] In one embodiment, the adjustment module 200 is further configured to increase the operating frequency of the compressor according to a preset frequency increase strategy; when the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor, increase the fan speed of the outdoor fan according to a preset speed increase strategy until the fan speed of the outdoor fan is greater than or equal to the maximum fan speed; or increase the fan speed of the outdoor fan according to a preset speed increase strategy; when the current fan speed of the outdoor fan is greater than or equal to the maximum fan speed of the outdoor fan, increase the operating frequency of the compressor according to a preset frequency increase strategy until the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor; or increase the fan speed of the outdoor fan according to a preset speed increase strategy until the fan speed of the outdoor fan is greater than or equal to the maximum fan speed, and increase the operating frequency of the compressor according to a preset frequency increase strategy until the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor.

[0136] In one embodiment, the acquisition module 100 is further configured to the preset protection conditions include: the exhaust temperature is less than a preset temperature threshold, or the exhaust pressure is less than a preset pressure threshold.

[0137] In this embodiment, when the heat pump water heater operates in a heat storage mode, the exhaust data of the compressor and the corresponding change trend of the exhaust data are acquired; when the exhaust data meets the preset protection conditions, the heating output of the heat pump water heater is adjusted according to the exhaust threshold corresponding to the exhaust data and the change trend of the exhaust data. By determining the magnitude relationship between the exhaust threshold corresponding to the exhaust data and the change trend of the exhaust data, it is judged whether it is necessary to adjust the heating output of the heat pump water heater, avoiding the heat pump water heater from causing fault protection due to excessive heating output, and improving the stability of user water use.

[0138] It should be understood that although the steps in the flowcharts in the embodiments of the present application are displayed in sequence according to the indications 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 some 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.

[0139] 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 it according to needs, and the present invention does not make any restrictions on this.

[0140] 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 no restrictions are imposed here.

[0141] 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 described here again.

[0142] In addition, it should be noted that in this article, the terms "include", "comprise" or any other variant 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 expressly listed, or also includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0143] 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.

[0144] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described 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 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.

[0145] 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 content of the specification 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 for heat storage, and the second heat exchange water circuit is used for heat exchange with the first heat exchange water circuit; The control method of the heat pump water heater includes: When the heat pump water heater operates in the heat storage mode, obtain the exhaust data of the compressor and the corresponding change trend of the exhaust data; When the exhaust data meets the preset protection condition, adjust the heating output of the heat pump water heater according to the exhaust threshold corresponding to the exhaust data and the change trend of the exhaust data.

2. The control method of the heat pump water heater according to claim 1, wherein, The exhaust data includes: exhaust temperature and / or exhaust pressure; The adjusting the heating output of the water heater according to the exhaust threshold corresponding to the exhaust data and the change trend of the exhaust data includes: When the exhaust temperature or the exhaust pressure is on the rise, determine the first temperature threshold corresponding to the exhaust temperature or the first pressure threshold corresponding to the exhaust pressure; When the exhaust temperature is less than the first temperature threshold or the exhaust pressure is less than the first pressure threshold, maintain the conventional control of the operating frequency of the compressor and the fan speed of the outdoor fan; When the exhaust temperature is greater than or equal to the first temperature threshold or the exhaust pressure is greater than or equal to the first pressure threshold, reduce the operating frequency of the compressor and / or the fan speed of the outdoor fan.

3. The control method of the heat pump water heater according to claim 2, characterized in that, The reducing the operating frequency of the compressor and / or the fan speed of the outdoor fan includes: Reduce the operating frequency of the compressor according to the preset frequency reduction strategy; when the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor, reduce the fan speed of the outdoor fan according to the preset speed reduction strategy until the fan speed of the outdoor fan is less than or equal to the minimum fan speed; or Reduce the fan speed of the outdoor fan according to the preset speed reduction strategy; when the current fan speed of the outdoor fan is less than or equal to the minimum fan speed of the outdoor fan, reduce the operating frequency of the compressor according to the preset frequency reduction strategy until the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor; or Reduce the fan speed of the outdoor fan according to the preset speed reduction strategy until the fan speed of the outdoor fan is less than or equal to the minimum fan speed, and reduce the operating frequency of the compressor according to the preset frequency reduction strategy until the current operating frequency of the compressor is less than or equal to the minimum operating frequency of the compressor.

4. The control method of the heat pump water heater according to claim 1, wherein, The adjusting the heating output of the water heater according to the exhaust threshold corresponding to the exhaust data and the change trend of the exhaust data further includes: When the exhaust temperature or the exhaust pressure is in a downward trend, determine the second temperature threshold corresponding to the exhaust temperature or the second pressure threshold corresponding to the exhaust pressure; When the exhaust temperature is less than the second temperature threshold or the exhaust pressure is less than the second pressure threshold, maintain the normal control of the operating frequency of the compressor and the fan speed of the outdoor fan; When the exhaust temperature is greater than or equal to the second temperature threshold or the exhaust pressure is greater than or equal to the second pressure threshold, determine the magnitude relationship of the temperature value between the exhaust temperature and the third temperature threshold, or the magnitude relationship of the pressure value between the exhaust pressure and the third pressure threshold; Adjust the operating frequency of the compressor and / or the fan speed of the outdoor fan according to the magnitude relationship of the temperature value or the magnitude relationship of the pressure value.

5. The control method of the heat pump water heater according to claim 4, characterized in that The adjusting the operating frequency of the compressor and / or the fan speed of the outdoor fan according to the magnitude relationship of the temperature value or the magnitude relationship of the pressure value includes: When the exhaust temperature is greater than or equal to the second temperature threshold and less than the third temperature threshold, or the exhaust pressure is greater than or equal to the second pressure threshold and less than the third pressure threshold, increase the operating frequency of the compressor and / or the fan speed of the outdoor fan; When the exhaust temperature is greater than or equal to the third temperature threshold, or the exhaust pressure is greater than or equal to the third pressure threshold, maintain the operating frequency of the compressor and the fan speed of the outdoor fan unchanged.

6. The control method of the heat pump water heater according to claim 5, characterized in that, The increasing the operating frequency of the compressor and / or the fan speed of the outdoor fan includes: Increase the operating frequency of the compressor according to a preset frequency increase strategy; when the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor, increase the fan speed of the outdoor fan according to a preset speed increase strategy until the fan speed of the outdoor fan is greater than or equal to the maximum fan speed; or Increase the fan speed of the outdoor fan according to a preset speed increase strategy; when the current fan speed of the outdoor fan is greater than or equal to the maximum fan speed of the outdoor fan, increase the operating frequency of the compressor according to a preset frequency increase strategy until the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor; or Increase the fan speed of the outdoor fan according to a preset speed increase strategy until the fan speed of the outdoor fan is greater than or equal to the maximum fan speed, and increase the operating frequency of the compressor according to a preset frequency increase strategy until the current operating frequency of the compressor is greater than or equal to the maximum operating frequency of the compressor.

7. The control method of the heat pump water heater according to any one of claims 1-6, characterized in that The preset protection condition includes: the exhaust temperature is less than a preset temperature threshold, or the exhaust pressure is less than a preset pressure threshold.

8. A control device for a heat pump water heater, characterized in that, 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 a water-fluorine heat exchanger. The hydraulic module includes a water pump and an expansion tank. 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 water pipeline. The first heat exchange water circuit is used for heat storage, and the second heat exchange water circuit is used for heat exchange with the first heat exchange water circuit; The control device of the heat pump water heater includes: An acquisition module, configured to acquire the exhaust data of the compressor and the corresponding exhaust data change trend when the heat pump water heater operates in a heat storage mode; An adjustment module, configured to adjust the heating output of the heat pump water heater according to the exhaust data and the exhaust threshold corresponding to the exhaust data change trend when the exhaust data meets a preset protection condition.

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. 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. 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.

Images