Heat pump water heater, control method and device thereof and computer readable storage medium

Abstract

The embodiment of the invention provides a heat pump water heater, a control method and device of the heat pump water heater and a computer readable storage medium. The control method of the heat pump water heater comprises the steps that the outdoor environment temperature and the exhaust pressure and the suction pressure of a compressor are obtained; the pressure difference value of the exhaust pressure and the suction pressure of the compressor is determined; and the rotating speed of an outdoor fan is controlled according to the outdoor environment temperature and the pressure difference value.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump water heaters, and in particular to a heat pump water heater and a control method, device, and computer-readable storage medium thereof. Background Art

[0002] In the related art, some heat pump water heaters have a frequency conversion function, which can reduce the operating energy consumption of the heat pump water heater by adjusting the compressor frequency. However, the control method in the related art has shortcomings, resulting in poor energy-saving effect of the heat pump water heater. Summary of the invention

[0003] The embodiments of the present application provide a heat pump water heater and a control method, device, and computer-readable storage medium thereof, which can effectively improve the operating energy efficiency of the heat pump water heater and achieve better power saving effects.

[0004] In a first aspect, an embodiment of the present application provides a heat pump water heater control method, including: obtaining the outdoor ambient temperature, the exhaust pressure and the suction pressure of the compressor; determining the pressure difference between the exhaust pressure and the suction pressure of the compressor; and controlling the speed of the outdoor fan according to the outdoor ambient temperature and the pressure difference.

[0005] In some embodiments, the speed of the outdoor fan is controlled according to the outdoor ambient temperature and the pressure difference, including: determining the temperature range in which the outdoor ambient temperature is located and the pressure difference range in which the pressure difference is located; determining the target speed of the outdoor fan according to the temperature range and the pressure difference range; and controlling the speed of the outdoor fan according to the target speed of the outdoor fan.

[0006] In some embodiments, determining the target speed of the outdoor fan according to the temperature interval and the pressure difference interval includes: in response to determining that the temperature interval is a first temperature interval less than a first threshold temperature and the pressure difference interval is a first pressure difference interval less than a first threshold pressure difference, determining the target speed of the outdoor fan to be a first preset speed; in response to determining that the temperature interval is the first temperature interval and the pressure difference interval is a second pressure difference interval greater than or equal to the first threshold pressure difference and less than a second threshold pressure difference, determining the target speed of the outdoor fan to be a second preset speed; in response to determining that the temperature interval is the first temperature interval and the pressure difference interval is a third pressure difference interval greater than or equal to the second threshold pressure difference, determining the target speed of the outdoor fan to be a third preset speed; in response to determining that the temperature interval is a second temperature interval greater than or equal to the first threshold temperature and less than the second threshold temperature, and the pressure difference interval is the first pressure difference interval, determining the target speed of the outdoor fan to be the second preset speed; in response to determining that the temperature interval is a second temperature interval greater than or equal to the first threshold temperature and less than the second threshold temperature, and the pressure difference interval is the first pressure difference interval, determining the target speed of the outdoor fan to be the second preset speed; In response to determining that the temperature interval is the second temperature interval and the pressure difference interval is the second pressure difference interval, the target speed of the outdoor fan is determined to be the third preset speed; in response to determining that the temperature interval is the second temperature interval and the pressure difference interval is the third pressure difference interval, the target speed of the outdoor fan is determined to be the fourth preset speed; in response to determining that the temperature interval is the third temperature interval greater than or equal to the second threshold temperature and the pressure difference interval is the first pressure difference interval, the target speed of the outdoor fan is determined to be the third preset speed; in response to determining that the temperature interval is the third temperature interval and the pressure difference interval is the second pressure difference interval, the target speed of the outdoor fan is determined to be the fourth preset speed; in response to determining that the temperature interval is the third temperature interval and the pressure difference interval is the third pressure difference interval, the target speed of the outdoor fan is determined to be the fifth preset speed; the first preset speed, the second preset speed, the third preset speed, the fourth preset speed and the fifth preset speed decrease in sequence.

[0007] In some embodiments, the rotation speed of the outdoor fan is negatively correlated with the outdoor ambient temperature; and / or the rotation speed of the outdoor fan is negatively correlated with the pressure difference.

[0008] In some embodiments, the heat pump water heater control method includes: controlling the frequency of the compressor according to the outdoor ambient temperature and the suction pressure of the compressor.

[0009] In some embodiments, the frequency of the compressor is controlled according to the outdoor ambient temperature and the suction pressure of the compressor, including: determining a temperature range in which the outdoor ambient temperature is located and a pressure range in which the suction pressure is located; determining a target frequency of the compressor according to the temperature range and the pressure range; and frequency controlling the compressor according to the target frequency of the compressor.

[0010] In some embodiments, the frequency of the compressor is negatively correlated with the outdoor ambient temperature; and / or, the frequency of the compressor is negatively correlated with the suction pressure.

[0011] In a second aspect, an embodiment of the present application provides a heat pump water heater control device, comprising: a data acquisition module, configured to acquire the outdoor ambient temperature, the exhaust pressure and the suction pressure of the compressor; a pressure difference determination module, configured to determine the pressure difference between the exhaust pressure and the suction pressure of the compressor; and a speed control module, configured to control the speed of the outdoor fan according to the outdoor ambient temperature and the pressure difference.

[0012] In a third aspect, an embodiment of the present application provides a heat pump water heater, comprising: a compressor, an outdoor heat exchanger, a water-side heat exchanger and an outdoor fan, wherein the outdoor fan and the outdoor heat exchanger are arranged correspondingly; a memory storing a computer program; and a processor, wherein the computer program, when executed by the processor, implements the heat pump water heater control method as described in any of the above embodiments.

[0013] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is loaded by a processor to execute the steps in the above-mentioned heat pump water heater control method.

[0014] The heat pump water heater control method provided in the embodiment of the present application can control the speed of the outdoor fan according to the outdoor ambient temperature and pressure difference, so that the heating capacity of the heat pump water heater and the actual heat demand are more consistent, which can not only match the hot water supply demand, but also avoid energy waste, thereby improving the operating energy efficiency of the heat pump water heater and achieving better power saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a flow chart of a heat pump water heater control method provided by some embodiments of the present application;

[0017] Figure 2 is a partial flow chart of a heat pump water heater control method provided in some embodiments of the present application;

[0018] Figure 3 is another partial flow chart of the heat pump water heater control method provided by some embodiments of the present application;

[0019] Figure 4 It is a structural diagram of a heat pump water heater provided in some embodiments of the present application.

[0020] Description of main component symbols:

[0021] 1- heat pump water heater, 10- processor, 20- memory. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0025] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0026] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0027] like Figure 1 As shown, in the first aspect, the embodiment of the present application provides a heat pump water heater control method, which includes S10~S30, which can effectively improve the operating energy efficiency of the heat pump water heater 1 and achieve better power saving effect.

[0028] Here, the heat pump water heater 1 may include a compressor, an outdoor heat exchanger, a water-side heat exchanger, and an outdoor fan; the outdoor fan and the outdoor heat exchanger are correspondingly arranged so that outdoor air and the outdoor heat exchanger perform convective heat exchange. When the heat pump water heater 1 releases hot water, the exhaust port of the compressor may be directly connected to the outdoor heat exchanger, or indirectly connected to the outdoor heat exchanger through a reversing valve, so that the gaseous refrigerant discharged from the compressor flows into the outdoor heat exchanger.

[0029] S10: Obtain the outdoor ambient temperature, the exhaust pressure and the suction pressure of the compressor.

[0030] Here, the outdoor ambient temperature can be measured by a temperature sensor installed outdoors, or can be obtained from meteorological information released by a meteorological measurement unit through the Internet. Here, the exhaust pressure of the compressor can be measured by a pressure sensor installed corresponding to the exhaust port of the compressor, and the suction pressure can be measured by a pressure sensor installed corresponding to the suction port of the compressor.

[0031] S20: Determine the pressure difference between the exhaust pressure and the suction pressure of the compressor. Here, the pressure difference can be obtained by subtracting the suction pressure from the exhaust pressure of the compressor.

[0032] S30: Control the speed of the outdoor fan according to the outdoor ambient temperature and pressure difference.

[0033] Here, the speed of the outdoor fan can be a specific speed value or a gear value, which is not limited in the embodiments of the present application. According to the outdoor ambient temperature and the pressure difference, the degree of matching between the heating capacity of the heat pump water heater 1 and the actual heat demand can be determined, and then the speed of the outdoor fan can be adjusted according to the matching degree. When the heating capacity of the heat pump water heater 1 is higher than the actual heat demand, the outdoor fan can be controlled to run at a lower speed so that the heating capacity of the heat pump water heater 1 is reduced to match the actual heat demand, thereby avoiding energy waste and achieving better energy-saving effects; when the heating capacity of the heat pump water heater 1 is lower than the actual heat demand, the outdoor fan can be controlled to run at a higher speed so that the heating capacity of the heat pump water heater 1 is increased to match the actual heat demand, thereby meeting the hot water supply demand.

[0034] Compared with the related technology, the heat pump water heater control method provided in the embodiment of the present application can control the speed of the outdoor fan according to the outdoor ambient temperature and pressure difference, so that the heating capacity of the heat pump water heater 1 and the actual heat demand are more consistent, which can not only match the hot water supply demand but also avoid energy waste, thereby improving the operating energy efficiency of the heat pump water heater 1 and achieving better power saving effect.

[0035] In some embodiments, the speed of the outdoor fan can be configured to be negatively correlated with the outdoor ambient temperature. When the pressure difference remains unchanged or changes slightly, the speed of the outdoor fan decreases as the outdoor ambient temperature increases, and increases as the outdoor ambient temperature decreases. In this way, when the outdoor ambient temperature is high, the speed of the outdoor fan can be set to be lower; and when the outdoor ambient temperature is low, the speed of the outdoor fan can be set to be higher.

[0036] In some embodiments, the speed of the outdoor fan can be configured to be negatively correlated with the pressure difference. The speed of the outdoor fan decreases as the pressure difference increases, and increases as the pressure difference decreases. In this way, when the pressure difference is high, the speed of the outdoor fan can be set to be lower; and when the pressure difference is low, the speed of the outdoor fan can be set to be higher.

[0037] like Figure 2 As shown, in some embodiments, S30 may include S31-S33.

[0038] S31: Determine the temperature range of the outdoor ambient temperature and the pressure difference range of the pressure difference.

[0039] Here, a plurality of continuously distributed temperature intervals and a plurality of continuously distributed pressure difference intervals may be pre-set in the control system of the heat pump water heater 1, and the plurality of temperature intervals and the plurality of pressure difference intervals may be intersected to form a plurality of speed control intervals, and a target speed value of the external fan may be set corresponding to each speed control interval. For example, if m continuously distributed temperature intervals and n continuously distributed pressure difference intervals are pre-set, the m temperature intervals and the n pressure difference intervals may be intersected to form m*n speed control intervals.

[0040] The number of temperature intervals / pressure difference intervals and the length of each temperature interval / pressure difference interval can be determined according to actual needs, and the embodiments of the present application do not limit this; generally speaking, if the number of temperature intervals / pressure difference intervals is large, the number of speed control intervals formed by the intersection is large, the number of external fan target speed values ​​set for the corresponding speed control intervals is large, the degree of matching between each external fan target speed value and the speed control interval is high, and the grading accuracy of the external fan target speed value is high; similarly, if the length of each temperature interval / pressure difference interval is short, the length of the speed control interval formed by the intersection is short, the temperature / pressure difference range corresponding to each external fan target speed value is small, the degree of matching between each external fan target speed value and the speed control interval is high, and the grading accuracy of the external fan target speed value is high.

[0041] S32: Determine a target speed of the outdoor fan according to the temperature range and the pressure difference range.

[0042] After determining the temperature range of the outdoor ambient temperature and the pressure difference range of the pressure difference, the corresponding speed control range can be determined according to the temperature range and the pressure difference range, and then the corresponding outdoor fan target speed value can be determined according to the speed control range, and used as the target speed of the outdoor fan.

[0043] S33: Controlling the speed of the outdoor fan according to the target speed of the outdoor fan.

[0044] After determining the target speed of the outdoor fan, the speed of the outdoor fan can be adjusted and controlled. For example, when the current speed of the outdoor fan is higher than the target speed of the outdoor fan, the current speed of the outdoor fan can be controlled to gradually or immediately decrease to the target speed of the outdoor fan; when the current speed of the outdoor fan is lower than the target speed of the outdoor fan, the current speed of the outdoor fan can be controlled to gradually or immediately increase to the target speed of the outdoor fan; when the current speed of the outdoor fan is equal to the target speed of the outdoor fan, the outdoor fan can be controlled to maintain the current speed.

[0045] In some examples, at least three continuously distributed temperature intervals and three continuously distributed pressure difference intervals can be pre-set in the control system of the heat pump water heater 1, the at least three temperature intervals include a first temperature interval less than a first threshold temperature, a second temperature interval greater than or equal to the first threshold temperature and less than a second threshold temperature, and a third temperature interval greater than or equal to the second threshold temperature. At least three pressure difference intervals include a first pressure difference interval less than the first threshold pressure difference, a second pressure difference interval greater than or equal to the first threshold pressure difference and less than the second threshold pressure difference, and a third pressure difference interval greater than or equal to the second threshold pressure difference. Accordingly, at least three temperature intervals and at least three pressure difference intervals intersect to form at least nine speed control intervals, and a corresponding external fan target speed value is set for each speed control interval. Exemplarily, the first threshold temperature may be 0°C, and the second threshold temperature may be 30°C.

[0046] Here, S32 may include S321 to S329.

[0047] S321: In response to determining that the temperature interval is the first temperature interval and the pressure difference interval is the first pressure difference interval, determining the target speed of the outdoor fan to be a first preset speed.

[0048] S322: In response to determining that the temperature interval is the first temperature interval and the pressure difference interval is the second pressure difference interval, determining the target speed of the outdoor fan to be a second preset speed.

[0049] S323: In response to determining that the temperature interval is the first temperature interval and the pressure difference interval is the third pressure difference interval, determining the target speed of the outdoor fan to be a third preset speed.

[0050] S324: In response to determining that the temperature interval is the second temperature interval and the pressure difference interval is the first pressure difference interval, determining the target speed of the outdoor fan to be a second preset speed.

[0051] S325: In response to determining that the temperature interval is the second temperature interval and the pressure difference interval is the second pressure difference interval, determining the target speed of the outdoor fan to be a third preset speed.

[0052] S326: In response to determining that the temperature interval is the second temperature interval and the pressure difference interval is the third pressure difference interval, determining the target speed of the outdoor fan to be a fourth preset speed.

[0053] S327: In response to determining that the temperature interval is the third temperature interval and the pressure difference interval is the first pressure difference interval, determining the target speed of the outdoor fan to be a third preset speed.

[0054] S328: In response to determining that the temperature interval is the third temperature interval and the pressure difference interval is the second pressure difference interval, determining the target speed of the outdoor fan to be a fourth preset speed.

[0055] S329: In response to determining that the temperature interval is the third temperature interval and the pressure difference interval is the third pressure difference interval, determining the target speed of the outdoor fan to be a fifth preset speed.

[0056] Among them, the first preset speed, the second preset speed, the third preset speed, the fourth preset speed and the fifth preset speed decrease in sequence. The specific values ​​of the first preset speed, the second preset speed, the third preset speed, the fourth preset speed and the fifth preset speed can be determined according to actual needs, and the embodiments of the present application are not limited to this. Exemplarily, the first preset speed can be the highest wind speed, the second preset speed can be the second highest wind speed, the third preset speed can be the middle wind speed, the fourth preset speed can be the second lowest wind speed, and the fifth preset speed can be the lowest wind speed.

[0057] By setting S321 to S329, the purpose of controlling the rotation speed of the outdoor fan according to the outdoor ambient temperature and the pressure difference can be better achieved.

[0058] In some embodiments, the heat pump water heater control method may include S40.

[0059] S40: Controlling the frequency of the compressor according to the outdoor ambient temperature and the suction pressure of the compressor.

[0060] In some examples, the frequency of the compressor can be configured to be negatively correlated with the outdoor ambient temperature. When the suction pressure of the compressor remains unchanged or changes slightly, the frequency of the compressor decreases as the outdoor ambient temperature increases, and increases as the outdoor ambient temperature decreases. In this way, when the outdoor ambient temperature is high, the frequency of the compressor needs to be set lower; and when the outdoor ambient temperature is low, the frequency of the compressor needs to be set higher.

[0061] In some examples, the frequency of the compressor can be configured to be negatively correlated with the suction pressure of the compressor. The frequency of the compressor decreases as the suction pressure increases, and increases as the suction pressure decreases. In this way, when the suction pressure is high, the frequency of the compressor can be set lower; and when the suction pressure is low, the frequency of the compressor can be set higher.

[0062] like Figure 3 As shown, in some examples, S40 may include S41 to S43.

[0063] S41: Determine the temperature range of the outdoor ambient temperature and the pressure range of the suction pressure.

[0064] Here, a plurality of continuously distributed temperature intervals and a plurality of continuously distributed pressure intervals may be pre-set in the control system of the heat pump water heater 1, and the plurality of temperature intervals and the plurality of pressure intervals may be cross-formed or one-to-one combined to form a plurality of frequency control intervals, and a compressor target frequency value may be set correspondingly for each frequency control interval. Exemplarily, j continuously distributed temperature intervals and k continuously distributed pressure intervals may be pre-set, and j temperature intervals and n pressure intervals may be cross-formed to form j*k frequency control intervals; and another exemplary method may be pre-set f continuously distributed temperature intervals and g continuously distributed pressure intervals, and f temperature intervals and g pressure intervals may be one-to-one combined to form g frequency control intervals, wherein at least one temperature interval and a plurality of pressure intervals may correspond to form a plurality of frequency control intervals.

[0065] The number of temperature intervals / pressure intervals and the length of each temperature interval / pressure interval can be determined according to actual needs, and the embodiments of the present application do not limit this; generally speaking, if the number of temperature intervals / pressure intervals is large, the number of frequency control intervals formed is large, the number of compressor target frequency values ​​set for the corresponding frequency control intervals is large, the matching degree between each compressor target frequency value and the frequency control interval is high, and the grading accuracy of the compressor target frequency value is high; similarly, if the length of each temperature interval / pressure interval is short, the length of the frequency control interval formed is short, the temperature / pressure difference range corresponding to each compressor target frequency value is small, the matching degree between each compressor target frequency value and the frequency control interval is high, and the grading accuracy of the compressor target frequency value is high.

[0066] Exemplarily, six continuously distributed temperature intervals and nine continuously distributed pressure intervals can be pre-set in the control system of the heat pump water heater 1, the six temperature intervals include a first temperature interval less than a first post-threshold temperature, a second temperature interval greater than or equal to the first post-threshold temperature and less than a second post-threshold temperature, a third temperature interval greater than or equal to the second post-threshold temperature and less than a third post-threshold temperature, a fourth temperature interval greater than or equal to the third post-threshold temperature and less than a fourth post-threshold temperature, a fifth temperature interval greater than or equal to the fourth post-threshold temperature and less than a fifth post-threshold temperature, and a sixth temperature interval greater than or equal to the fifth post-threshold temperature. The nine pressure intervals include a first pressure interval less than a first threshold pressure, a second pressure interval greater than or equal to the first threshold pressure and less than a second threshold pressure, a third pressure interval greater than or equal to the second threshold pressure and less than a third threshold pressure, a fourth pressure interval greater than or equal to the third threshold pressure and less than a fourth threshold pressure, a fifth pressure interval greater than or equal to the fourth threshold pressure and less than a fifth threshold pressure, a sixth pressure interval greater than or equal to the fifth threshold pressure and less than a sixth threshold pressure, a seventh pressure interval greater than or equal to the sixth threshold pressure and less than a seventh threshold pressure, a seventh pressure interval greater than or equal to the seventh threshold pressure and less than an eighth threshold pressure, and a ninth pressure interval greater than or equal to a ninth threshold pressure. Correspondingly, six temperature intervals and nine pressure intervals form at least nine frequency control intervals, namely, a first frequency control interval formed by a first temperature interval and a first pressure interval, a second frequency control interval formed by a second temperature interval and a second pressure interval, a third frequency control interval formed by a third temperature interval and a third pressure interval, a fourth frequency control interval formed by a fourth temperature interval and a fourth pressure interval, a fifth frequency control interval formed by a fifth temperature interval and a fifth pressure interval, a sixth frequency control interval formed by a sixth temperature interval and a sixth pressure interval, a seventh frequency control interval formed by a sixth temperature interval and a seventh pressure interval, an eighth frequency control interval formed by a sixth temperature interval and an eighth pressure interval, and a ninth frequency control interval formed by a sixth temperature interval and a ninth pressure interval, and a different compressor target frequency value is set for each frequency control interval. When the frequency of the compressor is negatively correlated with the outdoor ambient temperature and / or the suction pressure, the compressor target frequency value corresponding to the first frequency control interval to the compressor target frequency value corresponding to the ninth frequency control interval decreases in sequence; illustratively, the difference between the compressor target frequency values ​​corresponding to two adjacent frequency control intervals is 1 to 3 Hz, so as to achieve the purpose of fine-tuning with high control accuracy.

[0067] S42: Determine a target frequency of the compressor according to the temperature range and the pressure range.

[0068] After determining the temperature range of the outdoor ambient temperature and the pressure range of the suction pressure, the corresponding compressor target frequency value can be determined according to the temperature range and the pressure range, and used as the target frequency of the compressor.

[0069] S43: Controlling the frequency of the compressor according to the target frequency of the compressor.

[0070] After determining the target frequency of the compressor, the frequency of the compressor can be adjusted and controlled. For example, when the current frequency of the compressor is higher than the target frequency of the compressor, the current frequency of the compressor can be controlled to be reduced to the target frequency of the compressor; when the current frequency of the compressor is lower than the target frequency of the compressor, the current frequency of the compressor can be controlled to be increased to the target frequency of the compressor; when the current frequency of the compressor is equal to the target frequency of the compressor, the compressor can be controlled to maintain the current frequency.

[0071] In a second aspect, an embodiment of the present application provides a heat pump water heater control device, which includes: a data acquisition module, configured to obtain the outdoor ambient temperature, the exhaust pressure and the suction pressure of the compressor; a pressure difference determination module, configured to determine the pressure difference between the exhaust pressure and the suction pressure of the compressor; and a speed control module, configured to control the speed of the outdoor fan according to the outdoor ambient temperature and the pressure difference.

[0072] like Figure 4 As shown, in a third aspect, an embodiment of the present application provides a heat pump water heater 1, which includes a compressor, an outdoor heat exchanger, a water-side heat exchanger, an outdoor fan, a memory 20 and a processor 10, and the outdoor fan and the outdoor heat exchanger are correspondingly arranged. The memory 20 stores a computer program, and when the computer program is executed by the processor 10, a heat pump water heater control method provided in any of the above embodiments is implemented.

[0073] The processor 10 is connected to the memory 20, and can perform various actions and processes according to the program stored in the memory 20. Specifically, the processor 10 can be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 10 can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., which can be an X86 architecture or an ARM architecture.

[0074] The memory 20 may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronously linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that the memory 20 of the method described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0075] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored. The computer program is loaded by the processor 10 to execute the steps in the control method of any of the above embodiments.

[0076] Exemplarily, the above-mentioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., CDs (Compact Disks), DVDs (Digital Versatile Disks), etc.), smart cards and flash memory devices (e.g., EPROMs (Erasable Programmable Read-Only Memory), cards, sticks or key drives, etc.). The various computer-readable storage media described in the embodiments of the present application may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0077] The above is a detailed introduction to a heat pump water heater and its control method, device, and computer-readable storage medium provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A heat pump water heater control method, characterized in that: include: Obtain the outdoor ambient temperature, the discharge pressure and suction pressure of the compressor; Determining the pressure difference between the exhaust pressure and the suction pressure of the compressor; The rotation speed of the outdoor fan is controlled according to the outdoor ambient temperature and the pressure difference.

2. The heat pump water heater control method according to claim 1, characterized in that: The rotation speed of the outdoor fan is negatively correlated with the outdoor ambient temperature; and / or the rotation speed of the outdoor fan is negatively correlated with the pressure difference.

3. The heat pump water heater control method according to claim 1 or 2, characterized in that: Controlling the rotation speed of the outdoor fan according to the outdoor ambient temperature and the pressure difference includes: Determine the temperature range of the outdoor ambient temperature and the pressure difference range of the pressure difference value; Determining a target speed of the outdoor fan according to the temperature range and the pressure difference range; The speed of the outdoor fan is controlled according to the target speed of the outdoor fan.

4. The heat pump water heater control method according to claim 3, characterized in that: Determining a target speed of the outdoor fan according to the temperature range and the pressure difference range includes: In response to determining that the temperature interval is a first temperature interval less than a first threshold temperature and the pressure difference interval is a first pressure difference interval less than a first threshold pressure difference, determining the target speed of the outdoor fan to be a first preset speed; In response to determining that the temperature interval is the first temperature interval and the pressure difference interval is a second pressure difference interval that is greater than or equal to the first threshold pressure difference and less than a second threshold pressure difference, determining the target speed of the outdoor fan to be a second preset speed; In response to determining that the temperature interval is the first temperature interval and the pressure difference interval is a third pressure difference interval greater than or equal to the second threshold pressure difference, determining the target speed of the outdoor fan to be a third preset speed; In response to determining that the temperature interval is a second temperature interval greater than or equal to the first threshold temperature and less than a second threshold temperature, and the pressure difference interval is the first pressure difference interval, determining the target speed of the outdoor fan to be the second preset speed; In response to determining that the temperature interval is the second temperature interval and the pressure difference interval is the second pressure difference interval, determining the target speed of the outdoor fan to be the third preset speed; In response to determining that the temperature interval is the second temperature interval and the pressure difference interval is the third pressure difference interval, determining the target speed of the outdoor fan to be a fourth preset speed; In response to determining that the temperature interval is a third temperature interval greater than or equal to the second threshold temperature and the pressure difference interval is the first pressure difference interval, determining the target speed of the outdoor fan to be the third preset speed; In response to determining that the temperature interval is the third temperature interval and the pressure difference interval is the second pressure difference interval, determining the target speed of the outdoor fan to be the fourth preset speed; In response to determining that the temperature interval is the third temperature interval and the pressure difference interval is the third pressure difference interval, determining the target speed of the outdoor fan to be a fifth preset speed; The first preset speed, the second preset speed, the third preset speed, the fourth preset speed and the fifth preset speed decrease in sequence.

5. The heat pump water heater control method according to claim 1, characterized in that: include: The frequency of the compressor is controlled according to the outdoor ambient temperature and the suction pressure of the compressor.

6. The heat pump water heater control method according to claim 5, characterized in that: Controlling the frequency of the compressor according to the outdoor ambient temperature and the suction pressure of the compressor comprises: Determine the temperature range of the outdoor ambient temperature and the pressure range of the suction pressure; determining a target frequency of the compressor according to the temperature range and the pressure range; The compressor is frequency controlled according to a target frequency of the compressor.

7. The heat pump water heater control method according to claim 5, characterized in that: The frequency of the compressor is negatively correlated with the outdoor ambient temperature; and / or the frequency of the compressor is negatively correlated with the suction pressure.

8. A heat pump water heater control device, characterized in that: include: A data acquisition module is configured to acquire an outdoor ambient temperature, a discharge pressure and a suction pressure of a compressor; a pressure difference determination module, configured to determine a pressure difference between a discharge pressure and a suction pressure of the compressor; The speed control module is configured to control the speed of the outdoor fan according to the outdoor ambient temperature and the pressure difference.

9. A heat pump water heater, characterized in that: include: A compressor, an outdoor heat exchanger, a water-side heat exchanger and an outdoor fan, wherein the outdoor fan and the outdoor heat exchanger are arranged correspondingly; a memory storing a computer program; A processor, wherein when the computer program is executed by the processor, the heat pump water heater control method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in the heat pump water heater control method according to any one of claims 1 to 7.

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