A variable frequency heat pump control method, device, water heater and storage medium

Abstract

The present invention discloses a variable frequency heat pump control method, device, water heater and storage medium, the method includes: when it is detected that the bathing mode is turned on, obtaining a preset target temperature and starting the compressor; collecting the ambient temperature and the water inlet temperature once every preset first interval time; when the compressor runs at a preset frequency and presets the initial operation time, the initial operation frequency is calculated according to the preset target temperature and the water inlet temperature; the first target frequency of the compressor is calculated according to the initial operation frequency and the adjustment coefficient, so that the compressor frequency is adjusted to the first target frequency, and the adjustment coefficient is determined according to the preset target temperature and the water inlet temperature; the current compressor frequency is obtained every preset second interval time, and the second target frequency of the compressor is calculated according to the current compressor frequency and the adjustment coefficient, so that the compressor frequency is adjusted to the second target frequency. The present invention can adjust the outlet water temperature of the water heater to a temperature close to the preset target temperature in real time, thereby improving the user's bathing experience.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump water heater control, and in particular to a variable frequency heat pump control method, device, water heater and storage medium. Background Art

[0002] With the improvement of living standards, air source heat pumps have entered thousands of households and become common household appliances in modern life. Its energy saving and comfort have become the focus of users. Therefore, more and more users will choose to use more energy-saving variable frequency heat pumps to supply hot water, thereby creating a more comfortable working and living environment.

[0003] However, existing variable frequency heat pump water heaters cannot distinguish whether the user is bathing or not, and often operate in order to be more energy-efficient, so the unit cannot quickly produce hot water at the optimal frequency. As a result, it is easy to cause the water tank to run out of hot water before the bath is completed. This situation is more significant when the water storage tank of the heat pump water heater is not large enough, and thus cannot meet the user's current control needs for the heat pump water heater. Summary of the invention

[0004] The present invention provides a variable frequency heat pump control method, device, water heater and storage medium to solve the problem of accurately controlling the hot water output by the water heater at a preset target temperature during the variable frequency control of the heat pump water heater, so that the user can have a good bathing experience.

[0005] According to one aspect of the present invention, a variable frequency heat pump control method is provided, comprising:

[0006] When it is detected that the bathing mode is turned on, the preset target temperature is obtained and the compressor is started;

[0007] The ambient temperature and the inlet water temperature are collected once every preset first interval;

[0008] After the compressor runs at the preset frequency for a preset initial running time, the initial running frequency is calculated according to the preset target temperature and the inlet water temperature;

[0009] Calculating a first target frequency of the compressor according to the initial operating frequency and the adjustment coefficient, so that the compressor frequency is adjusted to the first target frequency, wherein the adjustment coefficient is determined according to a preset target temperature and an inlet water temperature;

[0010] The current compressor frequency is acquired at every preset second interval time, and the second target frequency of the compressor is calculated according to the current compressor frequency and the adjustment coefficient, so that the compressor frequency is adjusted to the second target frequency.

[0011] Optionally, the initial operating frequency is calculated according to the preset target temperature and the water inlet temperature, specifically:

[0012]

[0013] Where T 初 is the initial operating frequency, T s is the preset target temperature, T 进 is the inlet water temperature currently collected; F min Minimum operating frequency of the compressor, F max is the maximum operating frequency of the compressor; α is the temperature change compensation coefficient, and β is the environmental compensation coefficient.

[0014] Optionally, when the currently collected inlet water temperature is greater than the last collected inlet water temperature, the temperature change compensation coefficient is:

[0015]

[0016] When the currently collected inlet water temperature is lower than the last collected inlet water temperature, the temperature change compensation coefficient is:

[0017]

[0018] Among them, T 进-1 is the inlet water temperature collected last time, T 进 is the currently collected water inlet temperature, T 进-1 With T 进 The time interval between them is the first interval time.

[0019] Optionally, when the current ambient temperature is greater than the ambient temperature collected last time, the ambient compensation coefficient is:

[0020]

[0021] When the current ambient temperature is lower than the last collected ambient temperature, the ambient compensation coefficient is:

[0022]

[0023] T R is the currently collected ambient temperature.

[0024] Optionally, the first target frequency is:

[0025] T 目标1 =T 初 (1+ε)

[0026] Among them, T 初 is the initial operating frequency, and ε is the adjustment coefficient.

[0027] Optionally, the second target frequency is:

[0028] T 目标2=T 当前 (1+ε)

[0029] Among them, T 当前 is the current compressor frequency, and ε is the adjustment coefficient.

[0030] Optionally, the preset first formula is:

[0031]

[0032] Among them, T s is the preset target temperature, T 进 The inlet water temperature currently collected.

[0033] According to another aspect of the present invention, there is provided a variable frequency heat pump control device, comprising:

[0034] The detection unit is used to obtain the preset target temperature and start the compressor when detecting that the bathing mode is turned on;

[0035] A collection unit, used for collecting the ambient temperature and the inlet water temperature once every preset first interval;

[0036] a first calculation unit, configured to calculate an initial operating frequency according to a preset target temperature and an inlet water temperature after the compressor has been operated at the preset frequency for a preset initial operating time;

[0037] a second calculation unit, configured to calculate a first target frequency of the compressor according to the initial operating frequency and an adjustment coefficient, so that the compressor frequency is adjusted to the first target frequency, wherein the adjustment coefficient is determined according to a preset target temperature and an inlet water temperature;

[0038] The third calculation unit is used to obtain the current compressor frequency at every preset second interval time, and calculate the second target frequency of the compressor according to the current compressor frequency and the adjustment coefficient, so as to adjust the compressor frequency to the second target frequency.

[0039] According to another aspect of the present invention, there is provided a water heater, the water heater comprising:

[0040] A control module, a bathing switch, a compressor, a memory, an ambient temperature detector and a water inlet temperature detector electrically connected to the control module;

[0041] The ambient temperature detector is used to detect the ambient temperature, and the water inlet temperature detector is used to detect the water inlet temperature of the water heater;

[0042] The memory stores a computer program that can be executed by the control module. The computer program is executed by the control module so that the control module executes the variable frequency heat pump control method described in any embodiment of the present invention.

[0043] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a control module to implement the variable frequency heat pump control method described in any embodiment of the present invention when executed.

[0044] The technical solution of the embodiment of the present invention is to turn on the bathing mode after running at a preset frequency for a preset initial running time, and to control the frequency of the compressor operation in a timely manner, so that the compressor after adjusting the frequency to the target frequency can regularly increase or decrease the water inlet temperature, so that the water inlet temperature of the water heater can be close to the preset target temperature, so that the user can have a good bathing experience.

[0045] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 is a flow chart of a variable frequency heat pump control method provided according to Embodiment 1 of the present invention;

[0048] Figure 2 is a structural schematic diagram of a variable frequency heat pump control device applicable to Embodiment 2 of the present invention;

[0049] Figure 3 is a schematic diagram of the structure of a water heater provided according to Embodiment 3 of the present invention;

[0050] Figure 4 It is a specific structural diagram of a water heater;

[0051] Figure 5 is a specific heat pump system diagram of a water heater provided by the present application;

[0052] Figure 6 It is a specific installation diagram of a water heater provided in this application. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] Embodiment 1

[0056] Figure 1 A flow chart of a variable frequency heat pump control method is provided for the first embodiment of the present invention. Figure 1 As shown, the method includes:

[0057] 101. When it is detected that the bathing mode is turned on, the preset target temperature is obtained and the compressor is started;

[0058] Among them, the bathing mode is a compressor variable frequency mode set by the present invention. In the bathing mode, the adjustment coefficient can be determined according to the numerical interval of the difference between the current water inlet temperature and the preset target temperature, and the target frequency of the compressor can be calculated according to the adjustment coefficient and the current frequency of the compressor, and then the compressor is adjusted to the target frequency, thereby controlling the outlet water temperature. The preset target temperature is the temperature set by the user, that is, the water temperature set by the user when bathing. When it is detected that the bathing mode is turned on, the compressor can be started, the compressor is running, and the water temperature begins to be heated.

[0059] 102. Collecting the ambient temperature and the inlet water temperature once every preset first interval;

[0060] Specifically, the ambient temperature and the inlet water temperature may be collected once every preset first interval, wherein the preset first interval may be 30 seconds or one minute, or the optimal preset first interval may be set according to experimental data. The ambient temperature may be obtained by collecting the temperature of the space where the user is located through an ambient temperature detector. The inlet water temperature may be obtained by detecting the inlet water temperature of the water heater through an inlet water temperature detector.

[0061] 103. After the compressor runs at a preset frequency for a preset initial running time, the initial running frequency is calculated based on the preset target temperature and the inlet water temperature;

[0062] Specifically, due to the characteristics of the heat pump unit, when the heat pump starts running, the compressor can be operated at a preset frequency for a preset initial operation time, and then enter the bathing mode and start to adjust the compressor frequency regularly. The preset frequency can be a frequency of 50Hz, or it can be set to other frequencies; the preset initial operation time can be set to 2-5 minutes, for example, the preset initial operation time can be set to 3 minutes; in addition, when the compressor runs at a preset frequency for a preset initial operation time, the initial operation frequency can be calculated according to the preset target temperature and the inlet water temperature, and the initial operation frequency can be used to calculate the target operation frequency of the compressor.

[0063] 104. Calculate a first target frequency of the compressor according to the initial operating frequency and the adjustment coefficient, adjust the compressor frequency to the first target frequency, and the adjustment coefficient is determined according to the preset target temperature and the inlet water temperature;

[0064] Among them, since the initial operating frequency is correlated with the preset target temperature and the inlet water temperature, and the adjustment coefficient is also correlated with the preset target temperature and the inlet water temperature, the first target frequency of the compressor is calculated according to the initial operating frequency and the adjustment coefficient, and after the compressor frequency is adjusted to the first target frequency, the inlet water temperature can be close to the preset target temperature, so that the user can have a good bathing experience when bathing. Among them, the initial operating frequency is calculated only once after the compressor runs at the preset frequency for the preset initial operating time, and the initial operating frequency is not calculated subsequently.

[0065] 105. Obtain the current compressor frequency at every preset second interval time, and calculate the second target frequency of the compressor according to the current compressor frequency and the adjustment coefficient, so that the compressor frequency is adjusted to the second target frequency.

[0066] Among them, after calculating the initial operating frequency, the compressor frequency can be adjusted to the first target frequency. Then, after presetting the second interval time, the first target frequency can be used as the current compressor frequency, and the second target frequency of the compressor can be calculated based on the current compressor frequency and the adjustment coefficient. After presetting the second interval time again, the current compressor frequency can be obtained. The current compressor frequency obtained at this time is the second target frequency calculated last time. The second target frequency of the compressor is calculated again based on the current compressor frequency and the adjustment coefficient, and the compressor frequency is adjusted to the second target frequency. Step 105 can be repeated until the user finishes bathing.

[0067] The technical solution of the embodiment of the present invention is to turn on the bathing mode after running at a preset frequency for a preset initial running time, and to control the frequency of the compressor operation in a timely manner, so that the compressor after adjusting the frequency to the target frequency can regularly increase or decrease the water inlet temperature, so that the water inlet temperature of the water heater can be close to the preset target temperature, so that the user can have a good bathing experience.

[0068] Embodiment 2

[0069] A variable frequency heat pump control method according to a second embodiment of the present invention includes:

[0070] When it is detected that the bathing mode is turned on, the preset target temperature is obtained and the compressor is started;

[0071] Among them, after turning on the bathing mode, it is also necessary to check whether the heat pump system has any faults. If the heat pump system has not any faults, the compressor can be started.

[0072] In a specific implementation, calculating the initial operating frequency according to the preset target temperature and the water inlet temperature specifically includes:

[0073]

[0074] Where T 初 is the initial operating frequency, T s is the preset target temperature, T 进 is the currently collected water inlet temperature; F min is the minimum operating frequency of the compressor, F max is the maximum operating frequency of the compressor; α is the temperature change compensation coefficient, and β is the environmental compensation coefficient.

[0075] Among them, F max F is the maximum operating frequency of the compressor, which can generally be set to 100Hz; min The minimum operating frequency of the compressor, which can generally be set to 30Hz. max and F minIt can also be set as needed. α is the temperature change compensation coefficient, which can be determined based on the change in the inlet water temperature collected twice adjacently; β is the environment compensation coefficient, which can be determined based on the change in the ambient temperature collected twice adjacently. The above calculation formula for the initial operating frequency shows that the greater the difference between the preset target temperature and the inlet water temperature, the greater the value of the compressor frequency adjustment should be, that is, the inlet water temperature can be quickly adjusted to the preset target temperature.

[0076] Specifically, when the currently collected inlet water temperature is greater than the last collected inlet water temperature, the temperature change compensation coefficient is:

[0077]

[0078] It should be noted that when the current collected inlet water temperature drops compared to the last collected inlet water temperature, in order to avoid the water temperature dropping too fast, the current inlet water temperature can be subtracted from the last collected inlet water temperature according to a hysteresis of 1°C. That is, when the current collected inlet water temperature is lower than the last collected inlet water temperature, the temperature change compensation coefficient is:

[0079]

[0080] Among them, T 进-1 is the inlet water temperature collected last time, T 进 is the currently collected water inlet temperature, T 进-1 With T 进 The time interval between them is the first interval time.

[0081] Specifically, when the current ambient temperature is greater than the ambient temperature collected last time, the ambient compensation coefficient is:

[0082]

[0083] It should be noted that when the currently collected ambient temperature drops compared to the last collected ambient temperature, in order to prevent the ambient temperature from dropping too fast, the current inlet water temperature can be subtracted from the last collected inlet water temperature by 1°C. When the current ambient temperature is lower than the last collected ambient temperature, the environmental compensation coefficient is:

[0084]

[0085] T R is the currently collected ambient temperature.

[0086] In a specific implementation, the first target frequency is:

[0087] T 目标1 =β 初 (1+ε)

[0088] Among them, T 初 is the initial operating frequency, and ε is the adjustment coefficient.

[0089] In a specific implementation, the second target frequency is:

[0090] T 目标2 =T 当前 (1+ε)

[0091] Among them, T 当前 is the current compressor frequency, and ε is the adjustment coefficient.

[0092] It should be noted that both the first target frequency and the second target frequency should be integer values.

[0093] Among them, the preset adjustment coefficient is:

[0094]

[0095] Among them, T s is the preset target temperature, T 进 The inlet water temperature currently collected.

[0096] The formula of the above adjustment coefficient shows that when the difference between the preset target temperature and the inlet water temperature is larger, the value of the compressor frequency after adjustment should be larger, that is, after the compressor frequency is adjusted to the first target frequency, the inlet water temperature can be quickly adjusted to the preset target temperature.

[0097] Embodiment 3

[0098] Figure 2 This is a schematic diagram of the structure of a variable frequency heat pump control device provided in Embodiment 3 of the present invention. Figure 2 As shown, the device comprises:

[0099] The detection unit 201 is used to obtain a preset target temperature and start the compressor when detecting that the bathing mode is turned on;

[0100] A collection unit 202 is used to collect the ambient temperature and the inlet water temperature once every preset first interval;

[0101] The first calculation unit 203 is used to calculate the initial operation frequency according to the preset target temperature and the inlet water temperature after the compressor runs at the preset frequency for a preset initial operation time;

[0102] A second calculation unit 204 is used to calculate a first target frequency of the compressor according to the initial operating frequency and the adjustment coefficient, so that the compressor frequency is adjusted to the first target frequency, and the adjustment coefficient is determined according to a preset target temperature and an inlet water temperature;

[0103] The third calculation unit 205 is used to obtain the current compressor frequency at every preset second interval time, and calculate the second target frequency of the compressor according to the current compressor frequency and the adjustment coefficient, so as to adjust the compressor frequency to the second target frequency.

[0104] A variable frequency heat pump control device provided in an embodiment of the present invention can execute a variable frequency heat pump control method provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0105] Embodiment 4

[0106] Figure 3 This is a schematic diagram of the structure of a water heater provided by the fourth embodiment of the present invention. Figure 3 As shown, the water heater comprises:

[0107] A control module 301, a bath switch 302, a compressor 303, a memory 304, an ambient temperature detector 305 and an inlet water temperature detector 306 electrically connected to the control module;

[0108] The ambient temperature detector 305 is used to detect the ambient temperature, and the water inlet temperature detector 306 is used to detect the water inlet temperature of the water heater;

[0109] The memory 304 stores a computer program that can be executed by the control module 301 . The computer program is executed by the control module 301 so that the control module 301 executes the embodiment of the variable frequency heat pump control method described above.

[0110] Specifically, the water heater may include a control module 301, which may be a variety of general and / or special processing components with processing and computing capabilities, such as a central processing unit (CPU), a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The control module 301 executes the variable frequency heat pump control method described above.

[0111] The bath switch 302 can be arranged outside the water heater so that the user can directly contact and control the switch of the bath mode of the water heater; the compressor 303 is arranged inside the water heater, and the faster the frequency of its rotation, the faster the water temperature rises; the ambient temperature detector 305 can be arranged outside the water heater to detect the ambient temperature outside the water heater; the inlet water temperature detector 306 can be arranged on the inlet pipe to detect the inlet water temperature of the water heater. The control module 301 can store a computer program executable by the control module 301 according to the memory 304, so as to be able to open and close the bath switch 302, collect the ambient temperature and the inlet water temperature at a regular time, and control the frequency of the compressor at a regular time.

[0112] Specifically, a specific electrical schematic diagram of a water heater in the present application is as follows Figure 4 As shown, the figure also includes a power input module for providing power input for the water heater, an exhaust temperature detection module, a return air temperature detection module and a coil temperature detection module.

[0113] Specifically, a specific heat pump system diagram of a water heater in the present application is as follows: Figure 5 As shown, the figure also includes a schematic diagram of the water heater system, which illustrates the connection relationship between the various components and the installation position of each temperature detection point, and marks the flow direction of the refrigerant, as shown by the arrows in the figure.

[0114] Specifically, a specific installation diagram of a water heater in the present application is as follows Figure 6 As shown, the figure also includes a schematic diagram of the water heater installation, which illustrates the installation position of the water inlet temperature sensor. The whole machine is not limited to a split structure, but can also be an integrated unit.

[0115] The present invention also provides a computer-readable storage medium, which stores computer instructions. The computer instructions are used to implement the embodiment of the variable frequency heat pump control method when the control module is executed.

[0116] Specifically, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0117] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0118] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable frequency heat pump control method, It is characterized in that include: When it is detected that the bathing mode is turned on, the preset target temperature is obtained and the compressor is started; wherein the preset target temperature is the water temperature set by the user for bathing; The ambient temperature and the inlet water temperature are collected once every preset first interval; When the compressor runs at the preset frequency for the preset initial operation time, the initial operation frequency is calculated based on the preset target temperature and the inlet water temperature; Calculating a first target frequency of the compressor according to the initial operating frequency and the adjustment coefficient, so that the compressor frequency is adjusted to the first target frequency, wherein the adjustment coefficient is determined according to a numerical range in which a difference between the inlet water temperature and the preset target temperature lies; The current compressor frequency is acquired at every preset second interval time, and the second target frequency of the compressor is calculated according to the current compressor frequency and the adjustment coefficient, so that the compressor frequency is adjusted to the second target frequency.

2. The variable frequency heat pump control method according to claim 1, It is characterized in that The initial operating frequency is calculated according to the preset target temperature and the water inlet temperature, specifically: Where Tinitial is the initial operating frequency, T s is the preset target temperature, Tin is the currently collected inlet water temperature; F min Minimum operating frequency of the compressor, F max is the maximum operating frequency of the compressor; α is the temperature variation compensation coefficient, which is determined according to the variation of the inlet water temperature collected twice adjacently; β is an environmental compensation coefficient, and the environmental compensation coefficient is determined according to the change in the ambient temperature collected between two adjacent times.

3. The variable frequency heat pump control method according to claim 2, It is characterized in that When the currently collected inlet water temperature is greater than the last collected inlet water temperature, the temperature change compensation coefficient is: When the currently collected inlet water temperature is lower than the last collected inlet water temperature, the temperature change compensation coefficient is: Among them, T 进-1 is the inlet water temperature collected last time, T 进 is the currently collected water inlet temperature, T 进-1 With T 进 The time interval between them is the first interval time.

4. The variable frequency heat pump control method according to claim 2, It is characterized in that When the current ambient temperature is greater than the last collected ambient temperature, the ambient compensation coefficient is: When the current ambient temperature is lower than the last collected ambient temperature, the ambient compensation coefficient is: T R is the currently collected ambient temperature.

5. The variable frequency heat pump control method according to claim 1, It is characterized in that The first target frequency is: T Target 1 =Tinitial(1+ε) Among them, Tinitial is the initial operating frequency and ε is the adjustment coefficient.

6. The variable frequency heat pump control method according to claim 1, It is characterized in that The second target frequency is: T Target 2 =Tcurrent(1+ε) Wherein, Tcurrent is the current compressor frequency, and ε is the adjustment coefficient.

7. The variable frequency heat pump control method according to any one of claims 5 to 6, It is characterized in that The adjustment factor is: Among them, T s is the preset target temperature, and Tin is the currently collected water inlet temperature.

8. A variable frequency heat pump control device, It is characterized in that include: A detection unit, for obtaining a preset target temperature and starting the compressor when detecting that the bathing mode is turned on; wherein the preset target temperature is the water temperature set by the user for bathing; A collection unit, used for collecting the ambient temperature and the inlet water temperature once every preset first interval; A first calculation unit, configured to calculate an initial operating frequency according to a preset target temperature and an inlet water temperature after the compressor has been operated at a preset frequency for a preset initial operating time; a second calculation unit, configured to calculate a first target frequency of the compressor according to the initial operating frequency and an adjustment coefficient, so as to adjust the compressor frequency to the first target frequency, wherein the adjustment coefficient is determined according to a numerical interval of a difference between the inlet water temperature and the preset target temperature; The third calculation unit is used to obtain the current compressor frequency at every preset second interval time, and calculate the second target frequency of the compressor according to the current compressor frequency and the adjustment coefficient, so as to adjust the compressor frequency to the second target frequency.

9. A water heater, It is characterized in that It includes a control module, a bathing switch electrically connected to the control module, a compressor, a memory, an ambient temperature detector and a water inlet temperature detector; The ambient temperature detector is used to detect the ambient temperature, and the water inlet temperature detector is used to detect the water inlet temperature of the water heater; The memory stores a computer program executable by the control module, and the computer program is executed by the control module so that the control module executes the variable frequency heat pump control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a control module to implement the variable frequency heat pump control method according to any one of claims 1 to 7 when executed.

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