Heat pump water heater and control method

Abstract

The invention discloses a heat pump water heater and a control method. The heat pump water heater comprises a first circulation loop and a second circulation loop which are coupled through a first heat exchanger. The first circulation loop is further provided with a second heat exchanger, the second circulation loop is provided with a spraying device, the spraying device is installed on the peripheral side of the second heat exchanger and used for spraying water to the surface of the second heat exchanger, and a fan is further installed on the peripheral side of the second heat exchanger so as to reduce the environment temperature. The control method detects the temperature of each position and adjusts the working states of the water source and the second circulation loop. Cooling control is assisted through spraying, the peripheral working temperature of the heat exchanger can be effectively reduced, and normal supply of hot water in the high-temperature period is guaranteed; the spraying device can be started in a low-temperature scene to improve the heat absorption capacity of the heat exchanger and maintain the heating efficiency of the unit; in addition, the spraying water source and the water supply source are switched and controlled, open-type waterway characteristics are increased, interference to normal water use of a user is reduced, and the water source use efficiency and the user experience are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump systems and heat exchanger auxiliary devices, and particularly relates to a heat pump water heater and a control method. BACKGROUND

[0002] In recent years, air source heat pump water heaters, as a kind of efficient and energy-saving equipment that relies on low-grade heat energy in the air to realize water heating, have been continuously expanding in application in the fields of residential buildings, commercial places and industrial auxiliary hot water supply. As the core power component of the air source heat pump water heater, the operating state of the compressor directly determines the overall performance and service life of the unit. When the ambient temperature exceeds the design upper limit of the compressor, the compressor will trigger the built-in self-protection mechanism to stop running to avoid damage. Even if some units forcibly break through the protection mechanism to start through technical means, the service life of the compressor will be greatly shortened due to long-term over-temperature operation, increasing the user's later maintenance cost and equipment replacement frequency.

[0003] The climate environment has diversity and variability. In the face of high-temperature environment, the common heat pump water heater frequently faces the dilemma of being unable to start during the high-temperature period, and cannot meet the user's stable hot water use demand throughout the year. In addition, in the low-temperature and low-humidity environment, the unit also faces problems, that is, the temperature difference between the fin heat exchanger and the air decreases, the ability to absorb heat from the air significantly decreases, resulting in insufficient heating capacity of the unit and slow hot water heating speed. At the same time, in the low-temperature environment, the moisture in the air is easy to condense into frost on the surface of the fin heat exchanger, and the frost layer will hinder air circulation and heat exchange, further exacerbating the decline in heating capacity.

[0004] In summary, the existing air source heat pump water heater faces problems such as poor heat dissipation, compressor unable to start or service life shortened in high-temperature environment, and insufficient heat absorption of the fin heat exchanger in low-temperature environment, so the entire heat exchange device needs to be optimized and designed. SUMMARY

[0005] The present application provides a heat pump water heater to solve the problems in the prior art. By optimizing the selection and control logic of the spray water source, the unit is ensured to start normally under high-temperature working conditions, the heat exchange efficiency is improved under low-temperature working conditions, water resource waste is avoided, and long-term stable operation of the unit is ensured.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: On the one hand, the present application provides a heat pump water heater, which comprises a first circulation loop and a second circulation loop; a compressor, a four-way reversing valve, a first heat exchanger, a throttling device and a second heat exchanger are sequentially arranged in the first circulation loop; a spray device and the first heat exchanger are sequentially arranged in the second circulation loop; the first circulation loop is thermally coupled to the second circulation loop through the first heat exchanger; The spraying device is installed on the periphery of the second heat exchanger and is used for spraying water to the surface of the second heat exchanger, and a fan is installed on the periphery of the second heat exchanger and is used for starting when the ambient temperature of the heat pump water heater exceeds a preset value to reduce the ambient temperature; an ambient temperature sensor is installed on the side of the second heat exchanger; and the ambient temperature sensor is used for detecting the working temperature of the second heat exchanger. The second circulating loop is further connected with a water supply source.

[0007] Optionally, the first heat exchanger is a double-pipe heat exchanger and has a refrigerant inlet, a refrigerant outlet, a water inlet and a water outlet. The refrigerant inlet is connected with the four-way reversing valve, and the refrigerant outlet is connected with the throttling device. The water outlet is provided with a water temperature sensor and is used for detecting the outlet water temperature of the first heat exchanger.

[0008] Optionally, the spraying device is a pipe-type sprayer. The spraying device is installed above the second heat exchanger and is distributed along the long side direction of the second heat exchanger.

[0009] Optionally, the spraying device has a double-water inlet structure and includes a first water inlet side and a second water inlet side. The pipelines of the first water inlet side and the second water inlet side are respectively connected with electromagnetic valves, which are used for controlling the on-off of the water inlet sides. The second circulating loop is further provided with a first multi-way valve and a second multi-way valve; and the water supply source at least includes a pipeline water supply and a water storage structure. The first multi-way valve is located on the pipeline of the second water inlet side, and the second circulating loop is branched to connect the pipeline water supply through the first multi-way valve. The second multi-way valve is located on the pipeline of the first water inlet side and is located on the water inlet pipeline of the first heat exchanger, and the second circulating loop is branched to connect the water storage structure through the second multi-way valve.

[0010] On the other hand, the application further provides a heat pump water heater control method, which is used for controlling the aforementioned heat pump water heater and includes the following steps. Obtaining the outlet water temperature of the first heat exchanger and the working temperature of the second heat exchanger; According to the working temperature, the starting time and / or the running state of the heat pump water heater are controlled; According to the working temperature and the outlet water temperature, the starting, stopping or spraying action of the spraying device in the second circulating loop is controlled; the fan is divided into multiple gears according to the working intensity, and at least part of the gears of the fan work in cooperation with the spraying action of the spraying device; Based on the outlet water temperature, the communication path of the second circulating loop and the water supply source is controlled to adjust the water temperature in the spraying device.

[0011] Optionally, the control of the heat pump in the first circulating loop includes the following steps. When the working temperature does not exceed the system working temperature range, the heat pump is directly started; When the working temperature exceeds the system working temperature range, the spraying device is started to heat or cool the second heat exchanger, and after the detected working temperature enters the system working temperature range and is maintained for a preset time length, the heat pump is controlled to start; The system working temperature range is -5℃-45℃.

[0012] Optionally, the gear of the fan includes at least two gears of rotating speed, which are a first gear and a second gear; the rotating speed of the first gear is greater than that of the second gear. When the working temperature exceeds the upper limit of the system working temperature range, the fan is started and maintained at the first gear for cooling; if the detected working temperature decreases to the system working temperature range and lasts for 1 min, the heat pump is started and the fan is switched to the second gear; if the detected working temperature is still greater than the upper limit of the system working temperature range after 10 min, the spraying device is started and the fan is maintained to run for cooling, until the working temperature decreases to the system working temperature range and lasts for 1 min, and then the heat pump is started. When the spraying device is started, the working temperature is maintained in the range of -3℃-42℃ and lasts for 1 min, the spraying device is stopped.

[0013] Optionally, the control of the spraying device in the second circulating loop comprises: controlling the starting or stopping of the spraying device based on the working temperature, and controlling the spraying action of the spraying device based on the outlet water temperature; When the outlet water temperature is in a first temperature interval, the spraying device is controlled to run at a first spraying intensity and / or a second spraying intensity; When the outlet water temperature is in a second temperature interval, the spraying device is controlled to run at the second spraying intensity; When the outlet water temperature is in a third temperature interval, the spraying device is controlled to run at a third spraying intensity; The first temperature interval, the second temperature interval and the third temperature interval have no temperature intersection, and in order of average temperature from low to high, they are: the first temperature interval, the second temperature interval, and the third temperature interval; the spraying intensity is sorted based on the water consumption per unit time, and the first spraying intensity and the third spraying intensity are both less than the second spraying intensity.

[0014] Optionally, the first temperature interval is ≤20℃, the second temperature interval ranges from 20℃ to 40℃, and the third temperature interval is >40℃. When the outlet water temperature is in the first temperature interval, the fan is started and maintained at the highest gear; if the descending rate of the working temperature continuously exceeds a threshold value, the fan is reduced by one gear at intervals of 5 min until the fan is reduced to the lowest gear; if the descending rate of the working temperature continuously is less than the threshold value, the fan is maintained at the highest gear, and the spraying device is controlled to run at the second spraying intensity. When the outlet water temperature is in the second temperature interval, the fan is started and maintained at the highest gear speed; if the falling rate of the working temperature continues to be less than the threshold value and is maintained for 5 minutes, the spraying device is controlled to increase the second spraying intensity.

[0015] Optionally, the water supply source at least includes pipeline water supply and water storage structure; the control of the communication path of the second circulation loop with the water supply source includes: When it is detected that the outlet water temperature of the first heat exchanger is in the first temperature interval or the second temperature interval, the second circulation loop is controlled to communicate with the water storage structure; When it is detected that the outlet water temperature of the first heat exchanger is in the third temperature interval, the second circulation loop is controlled to at least communicate with the pipeline water supply.

[0016] The application also discloses an electronic device, which comprises a memory for storing at least one instruction and a processor for calling the instruction stored in the memory to execute the heat pump water heater control method in any of the above embodiments.

[0017] The application also discloses a computer readable storage medium, which stores at least one executable instruction, and the executable instruction is loaded and executed by a processor to implement the heat pump water heater control method in any of the above embodiments.

[0018] The application also discloses a computer program product, which comprises computer program code, and when the computer program code is run by a computer, the computer program code causes the computer to execute the heat pump water heater control method in any of the above embodiments.

[0019] Compared with the prior art, the application has the following beneficial effects: The application can effectively reduce the working temperature around the heat exchanger through spraying auxiliary cooling control, avoid triggering protection shutdown due to overtemperature, avoid irreversible damage to the compressor caused by forced start, and ensure normal hot water supply during high temperature period; under low temperature and low humidity working conditions, the spraying device is started to increase the heat absorption of the heat exchanger, relieve the problem of heat production attenuation, and maintain the heating efficiency of the unit; in addition, the spraying water source and the water supply source are switched, the water source is selected according to the outlet water temperature of the unit, water resource waste caused by a single water source is avoided, the open waterway feature is increased, the normal water use of the user is reduced, and the water source use efficiency and user experience are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 For the device pipeline connection diagram in the specific embodiments of the application; Figure 2 For the spray device installation position diagram in the specific embodiments of the application.

[0022] In the figure: 1, compressor, 2, four-way reversing valve, 3, jacketed heat exchanger, 4, throttle valve, 5, finned heat exchanger, 6, fan, 7, tubular sprayer, 8, ambient temperature sensor, 9, water temperature sensor, 10, first electromagnetic valve, 11, second electromagnetic valve, 12, first multi-way valve, 13, return water tank, 14, second multi-way valve. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0024] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, 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 the indicated technical features. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features.

[0026] In the present application, unless otherwise explicitly specified and limited, the terms “provided with”, “connected”, and other terms should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0027] In one aspect, the present embodiment provides a heat pump water heater as shown in Figure 1 and Figure 2 The heat pump water heater includes a first circulation loop and a second circulation loop.

[0028] The first circulation loop and the second circulation loop are both in the form of a circulation pipeline and contain devices installed on the pipeline. The first circulation loop and the second circulation loop are thermally coupled through a heat exchanger. The heat exchanger is a first heat exchanger. For example, the heat exchanger is a double-pipe heat exchanger 3, which can be a plate heat exchanger or a tube heat exchanger. In the embodiment, the double-pipe heat exchanger 3 is specifically a tube heat exchanger, which is provided with a first loop and a second loop, and can perform efficient heat exchange of the two loops while ensuring isolation of the heat transfer working medium of the two loops. Further, the first loop has a refrigerant inlet and a refrigerant outlet, which are respectively connected to the first circulation loop, and the first loop is used for the refrigerant of the circulation compressor 1; the second loop has a water inlet and a water outlet, which are respectively connected to the second circulation loop. The water outlet of the second loop is provided with a water temperature sensor 9 for detecting the outlet water temperature of the second loop.

[0029] The second heat exchanger is further provided in the first circulation loop, and the first circulation loop is connected in series with the heat pump of the water heater. Specifically, the core component of the heat pump in the embodiment is a compressor 1, which is directly connected in series with the first circulation loop and used for absorbing external heat and heating user water. The heat transfer working medium (refrigerant) outlet of the compressor 1 is connected to the first circulation loop, and at the outlet side, the heat transfer working medium (refrigerant) enters the aforementioned double-pipe heat exchanger 3 through a four-way reversing valve 2 and the corresponding first circulation loop pipeline, and then enters the second heat exchanger along the first circulation loop pipeline from the refrigerant outlet. The second heat exchanger in the embodiment is a fin heat exchanger 5, which is provided with an ambient temperature sensor 8. The ambient temperature sensor 8 is located at the upper part of the fin heat exchanger 5 and is used for detecting the working temperature of the fin heat exchanger 5. It should be noted that the ambient temperature sensor 8 is located close to the fin to make the detected temperature closer to the surface temperature of the fin, thereby facilitating subsequent temperature regulation. The front side of the fin heat exchanger 5 is further provided with a fan 6, which is used to accelerate the air flow in the ventilation path of the heat exchanger, so as to quickly transfer the heat in the air to the heat transfer working medium, and also facilitate subsequent spray cooling. Further, the fan 6 has at least two speed gears, i.e., a first gear and a second gear, and the speed of the first gear is greater than that of the second gear. Specifically, in the embodiment, the fan 6 has a high gear, n intermediate gears and a low gear. A throttling device, specifically a throttling valve 4, is further connected in series in the first circulation loop. The throttling valve 4 is located upstream of the fin heat exchanger 5. The outlet of the fin heat exchanger 5 is connected to the four-way reversing valve 2 through the first circulation loop pipeline, and then flows back to the heat transfer working medium (refrigerant) inlet of the compressor 1 through the subsequent first circulation loop pipeline, thereby completing the first circulation loop.

[0030] The second circulation loop is provided with a spraying device, which is installed on the side of the second heat exchanger and used for spraying water to the surface of the heat exchanger. Specifically, the spraying device is a spray head 7, which is installed on the side of the fin heat exchanger 5 and used for spraying water to the surface of the fin heat exchanger 5. The water inlet of the second loop is connected to the spraying head 7 through a water pipeline, and the water outlet of the second loop is connected to the spraying head 7 through a water pipeline. The spraying head 7 is provided with a water temperature sensor 10 for detecting the outlet water temperature of the spraying head 7. Figure 2As shown, the spraying device in this embodiment is a tubular sprayer 7, which is closed on one side and open on the other side, connecting to the inlet pipe of the second circulation loop. Multiple nozzles are machined on the tube body of the tubular sprayer 7, and nozzles are installed to achieve the spraying action. Furthermore, the spraying device is installed above the heat exchanger and distributed along the long side of the heat exchanger. It can be understood that in this embodiment, the distribution direction of the spraying device is the axial direction of the tube body, and the long side direction of the heat exchanger is the direction of the long side in the rectangular outline formed by the finned heat exchanger 5 under top view.

[0031] The second circulation loop is also connected to a water supply source. Specifically, in this embodiment, the second circulation loop has a dual-inlet structure, that is, the spray device has a dual-inlet structure, including a first inlet side and a second inlet side.

[0032] Solenoid valves, including a first solenoid valve 10 and a second solenoid valve 11, are connected in series on the pipelines of the first and second water inlets, respectively, to control the on / off state of the corresponding water inlets. The first solenoid valve 10 is installed on the first water inlet side, and the second solenoid valve 11 is installed on the second water inlet side.

[0033] Optionally, the second circulation loop in this embodiment is further provided with a first multi-way valve 12 and a second multi-way valve 14, and the water supply source includes at least a pipeline water supply and a water storage structure.

[0034] The first multi-way valve 12 is located on the pipeline on the second water inlet side, and the second circulation loop is connected to the pipeline for water supply through a branch of the first multi-way valve 12; the second multi-way valve 14 is located on the pipeline on the first water inlet side and is located on the water inlet pipeline of the shell-and-tube heat exchanger 3, and the second circulation loop is connected to the water storage structure through a branch of the second multi-way valve 14.

[0035] Furthermore, in this embodiment, the water storage structure is a return water tank 13 on the user side.

[0036] Therefore, the specific water path of the second circulation loop can be connected in the following ways: A. Return water tank 13-Second multi-way valve 14-Shell-tube heat exchanger 3-First solenoid valve 10-Pipe sprayer 7. B. Return water tank 13 - Second multi-way valve 14 - First multi-way valve 12 - Pipe sprayer 7; C. Return water tank 13 - Second multi-way valve 14 - First multi-way valve 12 (mixed flow pipeline water supply) - Pipe sprayer 7; D. Pipeline water supply - First multi-way valve 12 - Pipe sprayer 7; E. Pipeline water supply - First multi-way valve 12 - Second multi-way valve 14 (diverting part of the water into the return water tank 13) - Shell-and-tube heat exchanger 3 - First solenoid valve 10 - Pipe sprayer 7. F. Pipeline water supply - the first multi-way valve 12 - the second multi-way valve 14 (mixed with the water outlet of the return water tank 13) - the shell-and-tube heat exchanger 3 - the first solenoid valve 10 - the tube-type sprinkler 7; G. Pipeline water supply - the first multi-way valve 12 - the second multi-way valve 14 - the shell-and-tube heat exchanger 3 - the first solenoid valve 10 - the tube-type sprinkler 7.

[0037] The above structure of this embodiment can provide different water use options for the spraying device, so as to efficiently utilize water resources and corresponding energy, and can flexibly configure water sources for corresponding spraying operations on the premise of giving priority to ensuring water use on the user side.

[0038] On the other hand, based on the above device structure, this embodiment also provides a control method for a heat pump water heater, which includes: 1. Parameter detection; Before the device starts and during the operation, continuously detect two key parameters: (1) The working temperature of the fin heat exchanger 5, which is obtained by the ambient temperature sensor 8 installed on the fin heat exchanger 5, denoted as Tao; (2) The outlet water temperature of the first heat exchanger, which is obtained by the water temperature sensor 9 installed at the outlet of the first loop of the shell-and-tube heat exchanger 3, denoted as Tout.

[0039] The two parameters are fed back to the control module in real time as the basis for subsequent control actions.

[0040] 2. Heat pump start control; The control module adjusts the start time and operating state of the compressor 1 in the first circulation loop according to the detected working temperature of the fin heat exchanger 5, which is specifically divided into the following two situations: When the working temperature does not exceed the system working temperature range (-5°C < Tao ≤ 45°C), directly control the heat pump to start. The start process is: the heat pump operates according to the preset normal sequence, the compressor 1 and the four-way reversing valve 2 in the first circulation loop are opened in sequence, the throttle valve 4 upstream of the fin heat exchanger 5 operates at the initial opening degree, the fin heat exchanger 5 enters the heat exchange state, the fan 6 operates at a low speed according to the conventional control, the spraying device in the second circulation loop does not start temporarily, and the device operates in the conventional heating mode.

[0041] When the working temperature exceeds the system working temperature range, it is further divided into two categories: When the working temperature exceeds the upper limit of the system working temperature (Tao > 45°C), first start the spray device to cool down the fin heat exchanger 5. After detecting that the working temperature enters the system working temperature range (Tao ≤ 45°C) and remains for 1 minute, then control the heat pump to start. The specific process is as follows: First, start the fan 6 to operate at high speed, and use the high-speed operation of the fan 6 to reduce the temperature around the fin heat exchanger 5. If it is detected that Tao ≤ 45°C and lasts for 1 minute, the heat pump starts, and the fan 6 switches to low-speed operation; if after the fan 6 operates at high speed for 10 minutes, it is detected that Tao is still > 45°C, then start the spray device and keep the fan 6 running for cooling. After detecting that Tao ≤ 45°C and lasting for 1 minute, the heat pump starts, and the fan 6 adjusts its speed according to the conventional temperature control method. When the working temperature is lower than the lower limit of the system working temperature (Tao ≤ -5°C, and in a low-temperature and low-humidity environment, the heat absorption of the fin heat exchanger 5 decreases and the heating capacity of the unit decreases), if it is detected that Tout ≥ 40°C, first start the spray device, and call the water outlet of the shell-and-tube heat exchanger 3 to heat the fin heat exchanger 5. After detecting that the working temperature enters the system working temperature range (Tao > -3°C) and remains for 1 minute, then control the heat pump to start in the normal order.

[0042] 3. Spray device control The start, stop, and spraying actions of the spray device are jointly controlled by the working temperature of the fin heat exchanger 5 and the water outlet temperature of the first heat exchanger, specifically as follows: Start and stop control: Based on the judgment of the working temperature of the fin heat exchanger 5, when Tao > 45°C and the fan 6 operates at high speed for 10 minutes without reducing Tao below 45°C, or Tao ≤ -5°C and Tout ≥ 40°C, start the spray device; when it is detected that Tao ≤ 42°C and lasts for 1 minute (high-temperature cooling scenario), or Tao > -3°C and lasts for 1 minute (low-temperature heating scenario), stop the spray device, and the corresponding solenoid valve closes.

[0043] Spraying action control: According to the interval of the water outlet temperature of the first heat exchanger, adjust the spraying intensity of the spray device. Specifically: The first temperature interval is Tout ≤ 20°C, the second temperature interval is 20°C < Tout ≤ 40°C, and the third temperature interval is Tout > 40°C. The three intervals have no temperature intersection, and the average temperature increases in turn as the first temperature interval, the second temperature interval, and the third temperature interval; the spray device has 3 gears of spray water volume (high / medium / low), and the spraying intensity is sorted based on the water consumption per unit time. The second spraying intensity is the medium gear water volume, which is greater than the low gear water volume of the first spraying intensity and the low gear water volume of the third spraying intensity. The specific control is as follows: When Tout is within the first temperature range (Tout ≤ 20°C), control the spray device to operate at the first spray intensity (low water volume), and the fan 6 operates at a high speed; if the temperature drop rate of Tao is faster than 1°C / 3 min, the spray device maintains low water volume spraying, and the speed of the fan 6 decreases one gear every 5 minutes until the low gear; if the temperature drop rate of Tao is slower than 1°C / 3 min, the fan 6 maintains a high speed, and the spray device switches to the second spray intensity (medium water volume) after 5 minutes. When Tout is within the second temperature range (20°C < Tout ≤ 40°C), control the spray device to operate at the second spray intensity (medium water volume), and the fan 6 operates at a high speed; if the temperature drop rate of Tao is faster than 1°C / 3 min, the fan 6 maintains a high speed, and the spray device maintains medium water volume spraying; if the temperature drop rate of Tao is slower than 1°C / 3 min, the fan 6 maintains a high speed, and the spray device switches to high water volume spraying after 5 minutes. At this time, the high water volume is used as a supplementary adjustment for the second spray intensity to ensure the cooling effect. When Tout is within the third temperature range (Tout > 40°C), control the spray device to operate at the third spray intensity (low water volume). Since the temperature of the conventional pipeline water supply is lower than 20°C, both the spray device and the fan 6 can maintain their current states at this time.

[0044] 4. Control of the water supply source connection path The water supply source includes pipeline water supply and a water storage structure. The pipeline water supply can specifically be tap water or treated wastewater. Through the first multi-way valve 12 and the second multi-way valve 14 on the second circulation loop, adjust the connection path according to the outlet water temperature of the first heat exchanger to regulate the water temperature in the spray device, specifically as follows: When it is detected that the outlet water temperature of the first heat exchanger is within the first temperature range (Tout ≤ 20°C) or the second temperature range (20°C < Tout ≤ 40°C), and the spray device needs to perform corresponding spraying actions, control the second circulation loop to connect to the water tank 13; specifically, it is one of the connection paths A or B as described above. When it is detected that the outlet water temperature of the first heat exchanger is within the third temperature range (Tout > 40°C), control the second circulation loop to at least connect to the pipeline water supply; specifically, it is one of the connection paths D or G as described above.

[0045] If further optimization of the water temperature is required, through the coordinated switching of the first multi-way valve 12 and the second multi-way valve 14, the pipeline water supply and the water storage structure can supply water to the spray device simultaneously, or adjust the water temperature in the water storage structure to ensure that the spray water temperature meets the cooling requirements; specifically, it is one of the connection paths C, E, or F as described above.

[0046] This application also discloses an electronic device, comprising: a memory for storing at least one instruction; and a processor for calling the instruction stored in the memory to execute the heat pump water heater control method of any of the above embodiments.

[0047] This application also discloses a computer-readable storage medium storing at least one executable instruction, which is loaded and executed by a processor to implement the heat pump water heater control method in any of the above embodiments.

[0048] This application also discloses a computer program product, which includes computer program code. When the computer program code is run by a computer, it causes the computer to execute the heat pump water heater control method in any of the above embodiments.

[0049] Those skilled in the art will understand that the embodiments disclosed in this application can be provided as methods, systems, or computer program products. Therefore, the disclosure of this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the disclosure of this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0050] This application disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to the disclosed embodiments. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0051] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0052] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps that specify the function are in one or more boxes.

[0053] Finally, it should be noted that the above content is only used to illustrate the technical solution of this application, and is not intended to limit the scope of protection of this application. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this application shall not depart from the substance and scope of the technical solution of this application.

Claims

1. A heat pump water heater, characterized in that, It includes a first circulation loop and a second circulation loop; the first circulation loop is sequentially provided with a compressor, a four-way reversing valve, a first heat exchanger, a throttling device, and a second heat exchanger; the second circulation loop is sequentially provided with a spray device and a first heat exchanger; the first circulation loop is thermally coupled to the second circulation loop through the first heat exchanger. The spray device is installed around the second heat exchanger to spray water onto the surface of the second heat exchanger. A fan is also installed around the second heat exchanger to start when the ambient temperature of the heat pump water heater exceeds a preset value in order to lower the ambient temperature. An ambient temperature sensor is also installed beside the second heat exchanger to detect the operating temperature of the second heat exchanger. The second circulation loop is also connected to a water supply source.

2. The heat pump water heater according to claim 1, characterized in that, The first heat exchanger is a shell-and-tube heat exchanger, which has a refrigerant inlet, a refrigerant outlet, a water inlet, and a water outlet; The refrigerant inlet is connected to the four-way reversing valve, and the refrigerant outlet is connected to the throttling device; The outlet is equipped with a water temperature sensor to detect the outlet water temperature of the first heat exchanger.

3. The heat pump water heater according to claim 1, characterized in that, The spraying device is a tubular sprayer; The spraying device is installed above the second heat exchanger and distributed along the long side of the second heat exchanger.

4. The heat pump water heater according to claim 1, characterized in that, The spraying device has a dual-inlet structure, including a first inlet side and a second inlet side; Solenoid valves are connected in series on the pipelines of the first water inlet side and the second water inlet side respectively to control the on / off state of the water inlet side; The second circulation loop is also equipped with a first multi-way valve and a second multi-way valve; the water supply source includes at least a pipeline water supply and a water storage structure; The first multi-way valve is located on the pipeline on the second water inlet side, and the second circulation loop is connected to the pipeline for water supply through a branch of the first multi-way valve; The second multi-way valve is located on the pipeline on the first water inlet side and on the water inlet pipeline of the first heat exchanger. The second circulation loop is branched and connected to the water storage structure through the second multi-way valve.

5. A control method for a heat pump water heater, characterized in that, For controlling the heat pump water heater according to any one of claims 1-4, comprising: Obtain the outlet water temperature of the first heat exchanger and the operating temperature of the second heat exchanger; The start-up time and / or operating status of the heat pump water heater are controlled according to the operating temperature. Based on the operating temperature and the outlet water temperature, the starting, stopping, or spraying action of the spraying device in the second circulation loop is controlled; the fan is divided into multiple gears according to the working intensity, and at least some gears of the fan work in coordination with the spraying action of the spraying device; Based on the outlet water temperature, the connection path between the second circulation loop and the water supply source is controlled to adjust the water temperature in the spray device.

6. The heat pump water heater control method according to claim 5, characterized in that, Controlling the operation of the heat pump in the first circulation loop includes: If the operating temperature does not exceed the system operating temperature range, the heat pump will start directly. When the operating temperature exceeds the system operating temperature range, the spray device is activated to heat or cool the second heat exchanger. After the operating temperature is detected to enter the system operating temperature range and maintained for a preset time, the heat pump is then controlled to start. The system operates in a temperature range of -5℃ to 45℃.

7. The heat pump water heater control method according to claim 6, characterized in that, The fan has at least two speed settings, namely a first speed setting and a second speed setting; the speed setting of the first speed setting is greater than the speed setting of the second speed setting. When the operating temperature exceeds the upper limit of the system operating temperature, the fan is started and maintained at the first speed to cool down; if the operating temperature is detected to drop to the system operating temperature range and lasts for 1 minute, the heat pump is started and the fan is switched to the second speed. If the operating temperature is still higher than the upper limit of the system operating temperature after 10 minutes, the spray device is started and the fan is kept running to cool down until the operating temperature drops to the range of the system operating temperature, and the heat pump is started after 1 minute. Once the spraying device is started, the operating temperature is maintained within the range of -3℃ to 42℃ for 1 minute, then the spraying device is stopped.

8. The heat pump water heater control method according to claim 5, characterized in that, Controlling the operation of the spray device in the second circulation loop includes: The starting or stopping of the spray device is controlled based on the operating temperature, and the spraying action of the spray device is controlled according to the outlet water temperature. When the outlet water temperature is within the first temperature range, the spray device is controlled to operate at a first spray intensity and / or a second spray intensity; When the outlet water temperature is in the second temperature range, the spray device is controlled to operate at the second spray intensity. When the outlet water temperature is in the third temperature range, the spray device is controlled to operate at the third spray intensity. The first temperature range, the second temperature range, and the third temperature range have no temperature overlap, and are ordered from low to high average temperature as follows: first temperature range, second temperature range, and third temperature range; the spray intensity is sorted based on the water consumption per unit time, and the first spray intensity and the third spray intensity are both less than the second spray intensity.

9. The heat pump water heater control method according to claim 8, characterized in that, The first temperature range is ≤20℃, the second temperature range is 20℃-40℃, and the third temperature range is >40℃. When the outlet water temperature is within the first temperature range, the fan starts and maintains the highest speed. If the rate of decrease of the working temperature is greater than the threshold, the fan speed is reduced by one level every 5 minutes until the fan speed is reduced to the lowest level. If the rate of decrease of the working temperature is less than the threshold, the fan maintains the highest speed and controls the spray device to operate at the second spray intensity. When the outlet water temperature is within the second temperature range, the fan starts and maintains the highest speed. If the rate of decrease of the working temperature is continuously less than the threshold and is maintained for 5 minutes, the spray device is controlled to increase the second spray intensity.

10. The heat pump water heater control method according to claim 8 or 9, characterized in that, The water supply source includes at least a pipeline water supply and a water storage structure; the connection path between the second circulation loop and the water supply source includes: When the outlet water temperature of the first heat exchanger is detected to be within the first temperature range or the second temperature range, the second circulation loop is controlled to connect to the water storage structure. When the outlet water temperature of the first heat exchanger is detected to be within the third temperature range, the second circulation loop is controlled to at least connect to the water supply pipeline.

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