Control method and device of heat pump water heater and heat pump water heater

Abstract

The invention discloses a control method and device for a heat-pump water heater and the heat-pump water heater. The control method comprises the steps that when the heat-pump water heater starts a heat pump for heating, when the heat-pump water heater is in a first working mode, and if the environment temperature is smaller than a first preset temperature, a draught fan is controlled to operate at first power, otherwise, the fan is controlled to operate at second power; and when the heat pump water heater is in a second working mode, if the environment temperature is smaller than the first preset temperature, the fan is controlled to operate at second power, and otherwise, the fan is controlled to stop. The heat pump water heater is controlled to operate in different working modes, and when the heat pump water heater is in the second working mode, the fan is controlled to operate at lower power, so that the noise generated when the heat pump water heater operates is relatively lower, and the influence of the noise generated when the heat pump water heater operates on the life of a user is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of water heater control, and in particular to a control method and device for a heat pump water heater and a heat pump water heater. Background Art

[0002] Heat pump water heaters are generally divided into split water heaters and integrated water heaters. Among them, integrated water heaters have many advantages such as less space occupation and easy installation and maintenance, and are popular with users. Most integrated heat pump water heaters are installed on the balcony. The body of the integrated heat pump water heater integrates the water tank, compressor, heat dissipation fins, fan, internal connection pipes and control components.

[0003] Integrated heat pump water heaters usually include two heating methods: heat pump heating and electric heating. Heat pump heating is the main method and electric heating is the auxiliary method. During the heat pump heating process, the fan and other components will generate a lot of noise when working, which will cause the heat pump water heater to make a lot of noise and affect the user's life. Summary of the invention

[0004] The present application provides a control method and device for a heat pump water heater and a heat pump water heater, so as to reduce the impact of noise during operation of the heat pump water heater on the life of users.

[0005] According to a first aspect of the present application, a control method for a heat pump water heater is provided, wherein the heat pump water heater comprises a fan, wherein the operating state of the fan comprises a first power, a second power, and shutdown, wherein the first power is greater than the second power, and the control method comprises:

[0006] When the heat pump water heater starts heat pump heating, when the heat pump water heater is in the first working mode, if the ambient temperature is lower than the first preset temperature, the fan is controlled to operate at the first power, otherwise the fan is controlled to operate at the second power;

[0007] When the heat pump water heater is in the second working mode, if the ambient temperature is lower than the first preset temperature, the fan is controlled to operate at the second power, otherwise the fan is controlled to stop.

[0008] According to a second aspect of the present application, a control device for a heat pump water heater is provided, comprising:

[0009] A first control module is used for, when the heat pump water heater starts heat pump heating, when the heat pump water heater is in a first working mode, if the ambient temperature is lower than a first preset temperature, controlling the fan to operate at a first power, otherwise controlling the fan to operate at a second power;

[0010] The second control module is used for controlling the fan to operate at a second power when the heat pump water heater is in a second working mode and if the ambient temperature is lower than the first preset temperature, otherwise controlling the fan to stop.

[0011] According to the third aspect of the present application, a heat pump water heater is provided, comprising a main controller, a compressor, a fan, a water tank and an electric heating tube, the main controller comprising at least one processor, and a memory connected to the at least one processor, the memory storing a computer program executable by the at least one processor, the computer program being executed by the at least one processor so that the at least one processor can execute the method described in the first aspect.

[0012] In this embodiment, by setting two working modes, the heat pump water heater can be controlled to operate in different working modes. When the heat pump water heater is in the second working mode, under the same environmental conditions, the fan is controlled to operate at a lower power, so that the noise of the heat pump water heater during operation is relatively smaller, thereby reducing the impact of the noise of the heat pump water heater during operation on the user's life.

[0013] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A flow chart of a control method for a heat pump water heater provided by the present invention;

[0016] Figure 2 A flow chart of a control method for a heat pump water heater provided by the present invention in a second working mode;

[0017] Figure 3 A flow chart of a control method for a heat pump water heater provided by the present invention in a first working mode;

[0018] Figure 4 A schematic structural diagram of a control device for a heat pump water heater provided by the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0020] Embodiment 1

[0021] A heat pump water heater provided in this embodiment includes a water heater body. A main control board, a fan, a compressor and a water tank are also arranged inside the water heater body. The main control board is electrically connected to the compressor and the fan, and the water tank is connected to an external water point.

[0022] In this embodiment, specifically: the main control board, as the main control center of the water heater, is used to control the working state of the cooling fan and the compressor. The heat pump heating of the heat pump water heater is achieved by controlling the compressor and the cooling fan. The working principle of the heat pump heating of the heat pump water heater is common knowledge known to those skilled in the art. The present invention does not make any improvements to the structure and heating principle of the heat pump water heater, but only sets different working modes for the heat pump water heater to control the workload power of the fan while ensuring the normal operation of the heat pump heating, so that the overall noise of the heat pump water heater is low, so as to improve the existing heat pump water heater. The noise is too loud and brings constant problems to users. Among them, the operating state of the fan includes a first power, a second power and shutdown. The first power is greater than the second power. It can be understood that when the fan is shut down, the operating power of the fan is 0.

[0023] refer to Figure 1 The present embodiment provides a control method for a heat pump water heater, comprising the following steps:

[0024] Step 101: When the heat pump water heater starts heat pump heating, when the heat pump water heater is in the first working mode, if the ambient temperature is lower than the first preset temperature, the fan is controlled to operate at the first power, otherwise the fan is controlled to operate at the second power.

[0025] Step 102: When the heat pump water heater is in the second working mode, if the ambient temperature is lower than the first preset temperature, the fan is controlled to operate at the second power, otherwise the fan is controlled to stop.

[0026] The main control board is provided with a main controller, which is used to control the heat pump water heater to enter different working modes according to the external control instructions or the system timing when the heat pump water heater is started. The ambient temperature can be detected by a corresponding sensor, and optionally, the first preset temperature can be 35°C.

[0027] The main control board is also provided with a fan driver chip, which is used to control the operation of the fan. The main controller has a pulse width modulation interface, through which the main controller is connected to the fan driver chip. When the water heater starts heating, the fan driver chip receives the PWM value sent by the main controller and controls the operation of the fan according to the PWM value.

[0028] Specifically, pulse width modulation (PWM) is an analog control method that modulates the bias of the transistor base or MOS tube gate according to the change of the corresponding load to achieve the change of the transistor or MOS tube conduction time, thereby achieving the change of the output of the switching regulated power supply. This method can keep the output voltage of the power supply constant when the working conditions change, and is a very effective technology for controlling analog circuits using digital signals of microprocessors.

[0029] Optionally, the control method of the heat pump water heater further includes the following steps:

[0030] Step 103: After the heat pump is operated for a preset time period, when the heat pump water heater is in the first working mode and the fan is operated at the first power, if the exhaust temperature is greater than or equal to the second preset temperature and lasts for the first preset time, or the ambient temperature is greater than or equal to the first preset temperature, the fan is controlled to operate at the second power.

[0031] Step 104: When the heat pump water heater is in the first working mode and the fan is running at the second power, if the exhaust temperature is greater than or equal to a third preset temperature and lasts for a second preset time, the fan is controlled to stop; wherein the third preset temperature is greater than the second preset temperature.

[0032] Step 105: When the heat pump water heater is in the first working mode and the fan is stopped, if the exhaust temperature is less than or equal to the fourth preset temperature and lasts for the first preset time, or the return air temperature is less than the fifth preset temperature and lasts for the first preset time, the fan is controlled to operate at the second power.

[0033] Step 106: When the heat pump water heater is in the first operating mode and the fan is running at the second power, if the exhaust temperature is less than or equal to the fourth preset temperature and continues for the first preset time, or the return air temperature is less than the fifth preset temperature and continues for the first preset time, or the ambient temperature is less than or equal to the sixth preset temperature, the fan is controlled to run at the first power.

[0034] Among them, the exhaust temperature refers to the temperature of the gas discharged by the compressor, which can be detected by a sensor installed on the exhaust pipe; the return air temperature refers to the temperature of the gas inhaled by the compressor, which can be detected by a sensor installed on the return air pipe. The second preset temperature, the third preset temperature, the first preset time, the second preset time, the fourth preset temperature, the fifth preset temperature and the sixth preset temperature can be set according to actual needs. Optionally, the second preset temperature can be 100°C, the third preset temperature can be 105°C, the fourth preset temperature can be 85°C, the fifth preset temperature can be -1°C, and the fifth preset temperature can be 30°C; the first preset time can be 1 minute, and the second preset time can be 2 minutes.

[0035] For example, when the heat pump water heater is in the first operating mode, when the fan is running at the first power, the exhaust temperature and return air temperature of the compressor are detected in real time. If the exhaust temperature is ≥100°C and maintained for 1 minute, or the ambient temperature is ≥35°C, the fan is immediately adjusted to the second power to reduce the wind speed.

[0036] When the fan is running at the second power, the exhaust temperature and return air temperature of the compressor are detected in real time. If the exhaust temperature is ≥105℃ and maintained for 2 minutes, the fan is immediately controlled to stop to reduce the wind speed. If the exhaust temperature is ≤85℃ and maintained for 1 minute, and the ambient temperature is ≤30℃, the fan is immediately controlled to run at the first power to increase the wind speed.

[0037] When the fan stops, if the exhaust temperature is ≤85℃ and maintained for 1 minute, or the return air temperature is ≤-1℃, the fan will be immediately adjusted to the second power operation to increase the wind speed.

[0038] Step 107: After the heat pump is operated for a preset period of time, when the heat pump water heater is in the second working mode and the fan is operated at a second power, if the exhaust temperature is greater than or equal to the second preset temperature and lasts for a second preset time, the fan is controlled to stop.

[0039] Step 108: When the heat pump water heater is in the second working mode and the fan is stopped, if the exhaust temperature is less than or equal to the fourth preset temperature and lasts for the first preset time, or the return air temperature is less than the fifth preset temperature and lasts for the first preset time, the fan is controlled to operate at the second power.

[0040] For example, when the heat pump water heater is in the second working mode, when the fan is running at the second power, the exhaust temperature and return air temperature of the compressor are detected in real time. If the exhaust temperature is ≥100°C and remains for 2 minutes, the fan is immediately adjusted to stop to reduce the wind speed.

[0041] When the fan is shut down, the exhaust temperature and return air temperature of the compressor are detected in real time. If the exhaust temperature is ≤85℃ and maintained for 1 minute, or the return air temperature is ≤-1℃ and maintained for 1 minute, the fan will be immediately adjusted to the second power operation to increase the wind speed.

[0042] In one embodiment, after step 108, the following steps may also be included:

[0043] Step 109: When the heat pump water heater is in the second working mode, if the exhaust temperature is greater than the seventh preset temperature, the compressor and the fan are controlled to stop, and the electric heating pipe is started for heating.

[0044] Among them, the seventh preset temperature can be 115°C. It can be understood that when the heat pump water heater works in the second working mode, the heat dissipation capacity of the fan decreases, which may cause abnormal exhaust temperature. When the system fails, the heat pump water heater switches from heat pump heating to electric heating. When the exhaust temperature returns to normal, it switches to heat pump heating.

[0045] Specifically, the upper limit of the exhaust temperature of the compressor is set to 115°C. When the exhaust temperature is ≥115°C, the compressor is controlled to stop, and the code P2 is displayed on the display screen. At this time, the electric heating pipe is started for electric heating; when the exhaust temperature drops to ≤80°C, the compressor restarts, that is, it switches to heat pump heating.

[0046] For example, the preset time period can be set to 3 minutes. After the heat pump water heater has been running for 3 minutes, the operation of the heat pump water heater is relatively stable, thereby making subsequent detection and control more accurate.

[0047] In one embodiment, before step 101, the following steps may also be included:

[0048] Step 100: Get the current time. If the current time is within the preset silent time period, the heat pump water heater is in the second working mode. Otherwise, the heat pump water heater is in the first working mode.

[0049] The main controller can control the heat pump water heater to enter different working modes according to the external control instructions or the system timing. Specifically, the heat pump water heater can enter the corresponding working mode by software or hardware, for example, by sending a command to the heat pump water heater through an external device, so that the heat pump water heater enters a different working mode.

[0050] In this embodiment, by setting a silent time period inside the heat pump water heater, such as setting it between 6 a.m. and 8 a.m., the mode of the heat pump water heater is the second working mode. For example, once the heat pump water heater detects that the current time matches the set silent time period, the heat pump water heater enters the second working mode.

[0051] Optionally, a mute button or switch may be provided on the water heater body of the heat pump water heater. When the mute button or switch is pressed or turned on, the heat pump water heater enters the second working mode. Each time the heat pump water heater is started, it is determined whether the heat pump water heater needs to enter the second working mode. If so, the heat pump water heater enters the second working mode; otherwise, the heat pump water heater can be started in the first working mode.

[0052] refer to Figure 2 and Figure 3 In order to enable those skilled in the art to better understand the embodiment of the present application, the present embodiment is exemplarily described by an application scenario example. Optionally, the speed of the fan running with the first function may be 850 rpm, and the speed of the fan running with the second function may be 650 rpm. For ease of understanding, the fan running with the first function is defined as high-speed operation; the fan running with the second function is defined as low-speed operation, wherein:

[0053] Step S1, the heat pump water heater is powered on and operated, and it is determined whether the mute function is turned on. If so, step S2 is executed; if not, the process ends;

[0054] Step S2, determine whether the time is a silent period, if yes, execute step S3; if no, execute step S8;

[0055] Step S3, determine whether the water temperature of the water tank reaches the set temperature, if not, execute step S4; if not, end the process.

[0056] Step S4, determine whether the ambient temperature is less than 35°C, if so, control the fan to run at a low speed, and execute step S5; if not, control the fan to stop, and execute step S7;

[0057] Step S5: Check whether the heat pump water heater has been running for 3 minutes. If yes, go to step S6; if no, the fan continues to run at a low speed.

[0058] Step S6, determine whether the exhaust temperature is greater than or equal to 100°C and lasts for 2 minutes. If so, control the fan to stop and execute step S7; if not, the fan continues to run at a low speed;

[0059] Step S7, determine whether the exhaust temperature is less than or equal to 85°C and lasts for 1 minute, or the return air temperature is less than -1°C and lasts for 1 minute. If so, control the fan to run at a low speed and execute step S6; if not, keep the fan stopped and continue to execute step S7;

[0060] Step S8, determine whether the water temperature of the water tank reaches the set temperature, if not, execute step S9; if not, end the process;

[0061] Step S9, determine whether the ambient temperature is less than 35°C, if so, control the fan to run at high speed, and execute step S10; if not, control the fan to run at low speed, and execute step S11;

[0062] Step S10: Check whether the heat pump water heater has been running for 3 minutes. If yes, go to step S12; if no, the fan continues to run at high speed.

[0063] Step S11: Check whether the heat pump water heater has been running for 3 minutes. If yes, go to step S13; if no, the fan continues to run at a low speed.

[0064] Step S12: determine whether the exhaust temperature is greater than or equal to 100°C and lasts for 1 minute, or the ambient temperature is greater than or equal to 35°C. If so, control the fan to run at a low speed and execute step S13; if not, the fan continues to run at a high speed;

[0065] Step S13, determine whether the exhaust temperature is greater than or equal to 105°C and lasts for 2 minutes. If so, control the fan to stop and execute step S14; if not, the fan continues to run at a low speed and execute step S15;

[0066] Step S14, determine whether the exhaust temperature is less than or equal to 85°C and lasts for 1 minute, or the return air temperature is less than -1°C and lasts for 1 minute; if so, the fan runs at a low speed and executes step S13; if not, the fan remains stopped and continues to execute step S14;

[0067] Step S15, determine whether the exhaust temperature is less than or equal to 85°C and lasts for 1 minute, or the return air temperature is less than -1°C and lasts for 1 minute, or the ambient temperature is less than or equal to 30°C. If so, control the fan to run at high speed and execute step S12; if not, the fan continues to run at low speed and execute step S13.

[0068] It is understandable that during the heating process, the heat pump water heater will detect the water temperature in the water tank in real time. When the water temperature reaches the set temperature, the heat pump water heater stops heating.

[0069] In this embodiment, by setting two working modes, the heat pump water heater can be controlled to operate in different working modes. When the heat pump water heater is in the second working mode, the fan is controlled to operate at a lower power, so that the noise of the heat pump water heater during operation is relatively smaller, thereby reducing the impact of the noise of the heat pump water heater during operation on the user's life. It can be understood that when the heat pump water heater is in the second working mode, the judgment logic of the heat pump water heater is simpler than that of the first working mode, which facilitates the stable operation of the heat pump water heater.

[0070] Embodiment 2

[0071] refer to Figure 4 A control device for a heat pump water heater provided in the second embodiment of the present application may include the following modules:

[0072] The first control module 201 is used to control the fan to operate at a first power when the heat pump water heater starts heat pump heating and the heat pump water heater is in a first working mode, if the ambient temperature is lower than a first preset temperature, otherwise the fan is controlled to operate at a second power.

[0073] The second control module 202 is used for controlling the fan to operate at a second power when the heat pump water heater is in the second working mode and if the ambient temperature is lower than the first preset temperature, otherwise controlling the fan to stop.

[0074] In one embodiment, the first control module 201 is further configured to:

[0075] After running the heat pump heating for a preset time period, when the heat pump water heater is in the first working mode and the fan is running at the first power, if the exhaust temperature is greater than or equal to the second preset temperature and lasts for the first preset time, or the ambient temperature is greater than or equal to the first preset temperature, the fan is controlled to run at the second power.

[0076] When the heat pump water heater is in the first working mode and the fan is running at the second power, if the exhaust temperature is greater than or equal to the third preset temperature and lasts for the second preset time, the fan is controlled to stop; wherein the third preset temperature is greater than the second preset temperature.

[0077] In one embodiment, the first control module 201 may also be used to:

[0078] When the heat pump water heater is in the first operating mode and the fan is stopped, if the exhaust temperature is less than or equal to the fourth preset temperature and lasts for the first preset time, or the return air temperature is less than the fifth preset temperature and lasts for the first preset time, the fan is controlled to operate at the second power.

[0079] When the heat pump water heater is in the first operating mode and the fan is running at the second power, if the exhaust temperature is less than or equal to the fourth preset temperature and continues for the first preset time, or the return air temperature is less than the fifth preset temperature and continues for the first preset time, or the ambient temperature is less than or equal to the sixth preset temperature, the fan is controlled to run at the first power.

[0080] In one embodiment, the second control module 202 is further configured to:

[0081] After the heat pump is operated for a preset period of time, when the heat pump water heater is in a second working mode and the fan is operated at a second power, if the exhaust temperature is greater than or equal to a second preset temperature and lasts for a second preset time, the fan is controlled to stop.

[0082] In one embodiment, the second control module 202 may also be used to:

[0083] When the heat pump water heater is in the second operating mode and the fan is stopped, if the exhaust temperature is less than or equal to the fourth preset temperature and lasts for the first preset time, or the return air temperature is less than the fifth preset temperature and lasts for the first preset time, the fan is controlled to operate at the second power.

[0084] A control device for a heat pump water heater provided in an embodiment of the present application can execute a control method for a heat pump water heater provided in the above method embodiment of the present application, and has functional modules and beneficial effects corresponding to the execution method.

[0085] Embodiment 3

[0086] The water heater may include a main controller, a compressor, a fan, a water tank, and an electric heating pipe. The main controller includes at least one processor and a memory connected to at least one processor, such as a read-only memory (ROM), a random access memory (RAM), etc., wherein the memory stores a computer program executable by at least one processor, and the processor may perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) or loaded into the random access memory. The processor, ROM, and RAM are connected to each other through a bus.

[0087] The processor may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of processors include, but are not limited to, central processing units (CPUs), graphics processing units (GPUs), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The processor executes the various methods and processes described above.

[0088] In some embodiments, the method described in embodiment one may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium. In some embodiments, part or all of the computer program may be loaded and / or installed on the main controller via ROM. When the computer program is loaded into RAM and executed by the processor, one or more steps of the method described in embodiment one described above may be performed. Alternatively, in other embodiments, the processor may be configured to perform the method described in embodiment one in any other appropriate manner (e.g., by means of firmware).

[0089] 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 recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0090] The above specific implementations do not constitute a limitation on the protection scope of this application. 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 modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A control method for a heat pump water heater, wherein the heat pump water heater comprises a fan, wherein the operating states of the fan comprise a first power, a second power and shutdown, wherein the first power is greater than the second power, and wherein: The control method comprises the following steps: When the heat pump water heater starts heat pump heating, when the heat pump water heater is in the first working mode, if the ambient temperature is lower than the first preset temperature, the fan is controlled to operate at the first power, otherwise the fan is controlled to operate at the second power; When the heat pump water heater is in the second working mode, if the ambient temperature is lower than the first preset temperature, the fan is controlled to operate at the second power, otherwise the fan is controlled to stop.

2. The control method of the heat pump water heater according to claim 1, characterized in that: Also includes: After the heat pump is operated for a preset period of time, when the heat pump water heater is in the first working mode and the fan is operated at the first power, if the exhaust temperature is greater than or equal to the second preset temperature and lasts for the first preset time, or the ambient temperature is greater than or equal to the first preset temperature, the fan is controlled to operate at the second power; When the heat pump water heater is in the first working mode and the fan is running at the second power, if the exhaust temperature is greater than or equal to the third preset temperature and lasts for a second preset time, the fan is controlled to stop; wherein the third preset temperature is greater than the second preset temperature.

3. The control method of the heat pump water heater according to claim 2, characterized in that: Also includes: After the heat pump is operated for a preset period of time, when the heat pump water heater is in a second working mode and the fan is operated at a second power, if the exhaust temperature is greater than or equal to a second preset temperature and lasts for a first preset time, the fan is controlled to stop.

4. The control method of the heat pump water heater according to claim 2, characterized in that: Also includes: When the heat pump water heater is in the first operating mode and the fan is stopped, if the exhaust temperature is less than or equal to the fourth preset temperature and lasts for the second preset time, or the return air temperature is less than the fifth preset temperature and lasts for the first preset time, the fan is controlled to operate at the second power.

5. The control method of the heat pump water heater according to claim 4, characterized in that: Also includes: When the heat pump water heater is in the first operating mode and the fan operates at the second power, if the exhaust temperature is less than or equal to the fourth preset temperature and continues for the first preset time, or the return air temperature is less than the fifth preset temperature and continues for the first preset time, or the ambient temperature is less than or equal to the sixth preset temperature, the fan is controlled to operate at the first power.

6. The control method of the heat pump water heater according to claim 3, characterized in that: Also includes: When the heat pump water heater is in the second operating mode and the fan is stopped, if the exhaust temperature is less than or equal to the fourth preset temperature and lasts for the first preset time, or the return air temperature is less than the fifth preset temperature and lasts for the first preset time, the fan is controlled to operate at the second power.

7. The control method of the heat pump water heater according to claim 1, characterized in that: Also includes: The current time is obtained. If the current time is within a preset silent time period, the heat pump water heater is in the second working mode; otherwise, the heat pump water heater is in the first working mode.

8. The control method of the heat pump water heater according to claim 1, characterized in that: Also includes: When the heat pump water heater is in the second working mode, if the exhaust temperature is greater than the seventh preset temperature, the compressor and the fan are controlled to stop, and the electric heating pipe is started to heat.

9. A control device for a heat pump water heater, characterized in that: include: A first control module is used for, when the heat pump water heater starts heat pump heating, when the heat pump water heater is in a first working mode, if the ambient temperature is lower than a first preset temperature, controlling the fan to operate at a first power, otherwise controlling the fan to operate at a second power; The second control module is used for controlling the fan to operate at a second power when the heat pump water heater is in a second working mode and if the ambient temperature is lower than the first preset temperature, otherwise controlling the fan to stop.

10. A heat pump water heater, characterized in that: The invention comprises a main controller, a compressor, a fan, a water tank and an electric heating pipe, wherein the main controller comprises at least one processor and a memory connected to the at least one processor, wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 1 to 8.

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