Control method of heat pump water heater, controller, heat pump water heater and medium

Abstract

The embodiment of the invention provides a control method of a heat pump water heater, a controller, the heat pump water heater and a medium. The heat pump water heater is provided with a water tank, and the water tank is provided with an upper electric heating device, a lower electric heating device, an upper thermal bulb and a middle thermal bulb; the control method comprises the following steps that when the water temperature of the upper portion of the water tank is smaller than a preset threshold value, and the water temperature of the upper portion of the water tank and the water temperature of the middle portion of the water tank are both smaller than first trigger water temperature, the large-water-volume function is started, under the large-water-volume function, an upper electric heating device is started for heating, and the first trigger water temperature is smaller than the water temperature set by a user. According to the embodiment of the invention, the hot water output quantity can be effectively and quickly increased, the hot water quantity load generated by the unit every day is increased, the water outlet temperature required by a user can be reached while the power saving quantity of the heat pump water heater every year is relatively high, the VEEC value of the heat pump water heater which takes the STC value as a reference can be increased when the heat pump water heater is switched to a commercial use scene, and the customer demand is met.

Description

Technical Field

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

[0002] In the relevant technology, for heat pump water heaters in some countries and regions, the STC value is used as the benchmark for determining household energy efficiency, such as the amount of electricity saved by using hot water in a household for 10 years; while the commercial energy efficiency standard is determined by the VEEC value, such as the amount of carbon dioxide emissions reduced within a 10-year period.

[0003] Therefore, for heat pump water heaters whose energy efficiency standards are mainly based on STC values, when they are switched to commercial use scenarios, the VEEC values ​​are low and cannot meet customer needs. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a control method, a controller, a heat pump water heater and a medium for improving the VEEC value of the heat pump water heater to meet customer needs.

[0005] In a first aspect, an embodiment of the present application provides a control method for a heat pump water heater, wherein the heat pump water heater is provided with a water tank, wherein the water tank is provided with an upper electric heating device, a lower electric heating device, an upper temperature sensing package and a middle temperature sensing package, wherein the upper electric heating device and the upper temperature sensing package are both located at an upper position of the water tank, the lower electric heating device is located at a lower position of the water tank, and the middle temperature sensing package is located at a middle position of the water tank; the method comprises:

[0006] The upper temperature sensing package is used to detect the water temperature in the upper part of the water tank, and the middle temperature sensing package is used to detect the water temperature in the middle part of the water tank;

[0007] When the water temperature at the top of the water tank is lower than a preset threshold, and both the water temperature at the top of the water tank and the water temperature in the middle of the water tank are lower than the first trigger water temperature, the large water volume function is turned on. Under the large water volume function, the upper electric heating device is started for heating, and the first trigger water temperature is lower than the water temperature set by the user.

[0008] According to some embodiments of the present application, the method further includes:

[0009] When the large water volume function is turned on, first energy demand judgment information is obtained, wherein the first energy demand judgment information includes at least one of the following: water temperature in the middle of the water tank, ambient temperature, and system control mode;

[0010] When it is determined that the lower electric heating device has energy demand based on the first energy demand judgment information, starting the lower electric heating device is prohibited and the large water volume function is maintained turned on.

[0011] According to some embodiments of the present application, the method further includes:

[0012] When the large water volume function is turned off, obtaining second energy demand judgment information of the lower electric heater, wherein the second energy demand judgment information includes at least one of the following: the water temperature in the middle of the water tank, the ambient temperature, and the system control mode;

[0013] The working states of the lower electric heating device and the compressor are controlled according to the second energy demand judgment information.

[0014] According to some embodiments of the present application, controlling the working states of the lower electric heating device and the compressor according to the second energy demand judgment information includes at least one of the following:

[0015] When it is determined according to the second energy demand judgment information that the system has energy demand, turning on the lower electric heating device and the compressor;

[0016] When it is determined that there is no energy demand in the system according to the second energy demand judgment information, the lower electric heating device and the compressor are turned off and on.

[0017] According to some embodiments of the present application, the method further includes:

[0018] Determine the maximum value between the water temperature in the middle of the water tank and the water temperature in the upper part of the water tank;

[0019] When the maximum value is greater than or equal to a second trigger water temperature, the compressor is controlled to stop, wherein the second trigger water temperature is lower than the user-set water temperature and higher than the first trigger water temperature.

[0020] According to some embodiments of the present application, before detecting the water temperature at the upper part of the water tank by the upper temperature sensing package, the method further includes:

[0021] Obtaining the operation mode of the heat pump water heater;

[0022] The operating mode is determined to be a mode other than the vacation mode and the shutdown mode.

[0023] According to some embodiments of the present application, after starting the upper electric heating device to heat, the method further includes:

[0024] When the water temperature at the upper part of the water tank is greater than or equal to the second trigger water temperature, the upper electric heating device is controlled to stop heating, wherein the second trigger water temperature is lower than the user-set water temperature and greater than the first trigger water temperature.

[0025] According to some embodiments of the present application, after starting the upper electric heating device to heat, the method further includes:

[0026] Receive shutdown command;

[0027] In response to the shutdown instruction, the upper electric heating device is controlled to stop heating.

[0028] According to some embodiments of the present application, after starting the upper electric heating device to heat, the method further includes:

[0029] Receiving a fault signal from the upper temperature sensing package;

[0030] In response to the fault signal, the upper electric heating device is controlled to stop heating.

[0031] According to some embodiments of the present application, after starting the upper electric heating device to heat, the method further includes:

[0032] Receiving a vacation mode instruction;

[0033] In response to the vacation mode instruction, the upper electric heating device is controlled to stop heating, and the heat pump water heater is controlled to enter the vacation mode.

[0034] In a second aspect, an embodiment of the present application provides a controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method of the heat pump water heater of the first aspect mentioned above when running the computer program.

[0035] In a third aspect, an embodiment of the present application provides a heat pump water heater, comprising the controller of the second aspect described above.

[0036] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method of the heat pump water heater according to the first aspect above.

[0037] In a fifth aspect, an embodiment of the present application provides a computer program product, comprising a computer program or computer instructions, characterized in that the computer program or the computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium, and the processor executes the computer program or the computer instructions, so that the computer device executes the control method of the heat pump water heater as described in the first aspect above.

[0038] According to the technical solution of the embodiment of the present application, at least the following beneficial effects are achieved: in order to increase the water supply, achieve rapid heating, and quickly increase the hot water output, the embodiment of the present application adds an upper electric heating device to the upper part of the water tank, while retaining the lower electric heating device, and adds an upper temperature sensing package to control the upper electric heating device; when the water temperature at the upper part of the water tank is lower than the preset threshold, and the water temperature at the upper part of the water tank and the water temperature in the middle of the water tank are both lower than the first trigger water temperature, that is, when the upper electric heating device and the lower electric heating device have energy needs at the same time, the lower electric heating device is not turned on, and Only the upper electric heating device is turned on, and because the water outlet of the water tank is located at the upper position, the embodiment of the present application can first heat the water in the upper part of the water tank through the upper electric heater, which can effectively and quickly increase the hot water output and increase the daily hot water load generated by the unit. In addition, since only the upper electric heating device is turned on, it can ensure that the heat pump water heater saves more electricity each year while achieving the water outlet temperature required by the user, thereby improving the VEEC value when the heat pump water heater based on the STC value is switched to a commercial use scenario, thereby meeting customer needs.

[0039] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0041] Figure 1 This is a schematic diagram of the water tank structure of a heat pump water heater provided in one embodiment of the present application;

[0042] Figure 2 is a flow chart of a control method of a heat pump water heater provided by an embodiment of the present application;

[0043] Figure 3 is a flow chart of a control method of a heat pump water heater provided by another embodiment of the present application;

[0044] Figure 4 is a flow chart of a control method of a heat pump water heater provided by another embodiment of the present application;

[0045] Figure 5 is a flow chart of a control method of a heat pump water heater provided by another embodiment of the present application;

[0046] Figure 6 is a flow chart of a control method of a heat pump water heater provided by another embodiment of the present application;

[0047] Figure 7 is a flow chart of a control method of a heat pump water heater provided by another embodiment of the present application;

[0048] Figure 8 It is a schematic diagram of a controller for executing a control method for a heat pump water heater provided in one embodiment of the present application. DETAILED DESCRIPTION

[0049] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0050] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0052] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0053] In some cases, for heat pump water heaters in some countries and regions, for example, Australia's heat pump water heaters use the STC value as the benchmark for household energy efficiency, which is the electricity saved for 10 years of household hot water use; the commercial energy efficiency standard uses the VEEC value to determine the amount of carbon dioxide emissions reduced over a 10-year period, which is mainly used in Victoria.

[0054] Therefore, Australia's current energy efficiency standards for heat pump water heaters are mainly based on the STC value. When switching to commercial use scenarios, the VEEC value is low and cannot meet customer needs.

[0055] Based on the above situation, the embodiment of the present application proposes a control method, controller, heat pump water heater and medium for a heat pump water heater. When a household water heater is switched to a commercial scenario, the control system is optimized, the hot water usage is increased, the VEEC value is increased, and the carbon dioxide emissions within the customer's service life are reduced. The embodiment of the present application can achieve the purpose of increasing the VEEC value to the maximum on the current unit by optimizing the control logic.

[0056] The various embodiments of the heat pump water heater of the present application are further described below in conjunction with the accompanying drawings.

[0057] like Figure 1 As shown, Figure 1 It is a schematic diagram of the water tank structure of a heat pump water heater provided in one embodiment of the present application.

[0058] In one embodiment, the heat pump water heater is provided with a water tank 100, wherein, in order to heat the domestic water in the water tank 100, the embodiment of the present application is provided with an upper electric heating device 110 at the upper position of the water tank 100, and a lower electric heating device 120 is provided at the lower position of the water tank 100. Specifically, the embodiment of the present application can first heat the domestic water at the upper part of the water tank 100 through the upper electric heating device 110, or first heat the domestic water at the lower part of the water tank 100 through the lower electric heating device 120.

[0059] A heat pump water heater is an energy-efficient device that heats water by absorbing heat from the air or other low-temperature heat sources. In some cases, such as when the ambient temperature is very low, a heat pump water heater can be equipped with an electric heating device as an auxiliary heating means to ensure that sufficient hot water can be provided even in extreme weather conditions.

[0060] Therefore, when the heat pump system cannot provide sufficient heat, the upper electric heating device 110 and the lower electric heating device 120 can supplement heat through electric heating to ensure hot water supply.

[0061] It is understood that the upper electric heating device 110 and the lower electric heating device 120 can be spiral, U-shaped or other shapes, and their materials can be stainless steel, high-grade nickel alloy, copper or other materials. These components can be customized according to customer requirements or market demand to adapt to different heating performance and heat transfer media.

[0062] In one embodiment, in order to detect the temperature of domestic water inside the water tank 100, the embodiment of the present application sets an upper temperature sensing package 130 at the upper position of the water tank 100, and sets a middle temperature sensing package 140 at the middle position of the water tank 100. Specifically, the embodiment of the present application can detect the water temperature at the upper part of the water tank through the upper temperature sensing package 130, or detect the water temperature at the middle part of the water tank through the middle temperature sensing package 140.

[0063] Among them, the temperature sensing package inside the water tank 100 is also called a temperature sensor or a temperature probe, which is a device for detecting and monitoring the water temperature of the water tank. The embodiment of the present application can monitor the water temperature inside the water tank 100 in real time through the temperature sensing package to ensure that the water temperature remains within the range set by the user, and can turn on or off the electric heating device according to the signal of the temperature sensing package to maintain a constant water temperature; in addition, the temperature sensing package can also be used as part of a safety device. When the water temperature exceeds the set safety threshold, it can trigger a safety mechanism, such as automatically shutting down the electric heating device or starting the pressure relief valve to prevent overheating and potential dangers; in addition, if the temperature sensing package fails, it may provide an erroneous temperature reading, causing the water heater to fail to work properly. Therefore, the status of the temperature sensing package is also an important aspect of water heater fault diagnosis.

[0064] It is understandable that the types of the upper temperature sensing package 130 and the lower temperature sensing package can be mechanical or electronic. Among them, the mechanical temperature sensing package usually uses a bimetallic strip or liquid expansion principle to detect temperature changes, while the electronic temperature sensing package uses electronic components such as thermistors or thermocouples.

[0065] In one embodiment, the water tank 100 is provided with a water inlet and a water outlet, wherein the water inlet is connected to the lower position of the water tank 100 , and the water outlet is connected to the upper position of the water tank 100 .

[0066] Among them, since the density of hot water is less than that of cold water, when the lower electric heating device 120 is started, the hot water in the lower part of the water tank 100 will naturally rise, while the cold water in the upper part of the water tank 100 will naturally fall, thereby forming a thermal convection phenomenon. Therefore, the embodiment of the present application designs the water inlet at the bottom so that the cold water can naturally sink after entering, while the hot water flows out from the upper water outlet, so that the user can use water with a higher temperature.

[0067] In addition, if the water inlet and the water outlet are both located at the same horizontal position, the incoming cold water may mix with the hot water in the water tank 100, resulting in a decrease in the outlet water temperature. Therefore, the embodiment of the present application can reduce the mixing of cold water and hot water by placing the water inlet at the lower position of the water tank 100, thereby maintaining the temperature of the hot water.

[0068] In addition, since the efficiency of hot water use is very important, the embodiment of the present application designs the water outlet at the upper position of the water tank 100. When only the upper electric heating device 110 is started, the mixing of the upper hot water with the lower cold water before being used can be greatly reduced, thereby improving the utilization efficiency of hot water.

[0069] In addition, for some water tanks 100 for storing drinking water, sediment may accumulate at the bottom of the water tank 100. Therefore, the water inlet is designed at the lower part of the water tank 100 in the embodiment of the present application, which helps to keep these sediments at the bottom of the water tank 100 instead of flowing out through the water outlet, so as to ensure the cleanliness of the water quality.

[0070] Based on the hardware structure of the heat pump water heater of each of the above embodiments, various embodiments of the control method of the heat pump water heater of the present application are respectively proposed below.

[0071] like Figure 2 As shown, Figure 2 It is a flow chart of a control method of a heat pump water heater provided by an embodiment of the present application; the control method may include but is not limited to step S210 and step S220.

[0072] Step S210, detecting the water temperature in the upper part of the water tank by using the upper temperature sensing package, and detecting the water temperature in the middle part of the water tank by using the middle temperature sensing package;

[0073] Step S220, when the water temperature at the top of the water tank is lower than the preset threshold, and the water temperature at the top of the water tank and the water temperature in the middle of the water tank are both lower than the first trigger water temperature, turn on the large water volume function, wherein, under the large water volume function, start the upper electric heating device for heating, and the first trigger water temperature is lower than the water temperature set by the user.

[0074] In one embodiment, when the heat pump water heater is operating normally, the upper temperature sensing package will detect the water temperature in the upper part of the water tank, and transmit the corresponding water temperature signal to the controller of the heat pump water heater. At the same time, the lower temperature sensing package will also detect the water temperature in the middle part of the water tank, and transmit the corresponding water temperature signal to the controller of the heat pump water heater. Then, the controller will obtain the water temperature in the upper part and the water temperature in the middle part of the water tank according to the received water temperature signal, and compare the water temperature in the upper part of the water tank with the preset threshold, and compare the water temperature in the upper part of the water tank with the water temperature in the middle part of the water tank and the first trigger water temperature. If the water temperature in the upper part of the water tank is lower than the preset threshold and the water temperature in the upper part and the water temperature in the middle part of the water tank are both lower than the first trigger water temperature, it indicates that the water temperature in the water tank is much lower than the water temperature set by the user, that is, both the upper electric heating device and the lower electric heating device have energy demand. In this regard, in order to increase the VEEC value while heating quickly, the embodiment of the present application will only start the upper electric heating device for heating.

[0075] It should be noted that the above-mentioned preset threshold can be pre-set by the system, and it can be determined based on the comfortable water temperature felt by human skin. For example, for bathing, a comfortable water temperature is usually slightly higher than the temperature of the skin surface. According to different studies and guidelines, a comfortable bathing water temperature is usually recommended to be between 37°C and 42°C. Since hot water will pass through pipes during transportation and will be affected by the ambient temperature, and may also be mixed with cold water, the temperature of the hot water supplied to the user at the end will drop. In this regard, the preset threshold of an embodiment of the present application can add a positive compensation temperature based on the comfortable water temperature felt by human skin, that is, the preset threshold can be set to 50°C.

[0076] In addition, for the first trigger water temperature, its value must be lower than the water temperature set by the user. If the water temperature at the top of the water tank and the water temperature in the middle of the water tank are both lower than the first trigger water temperature, it means that the water temperature at the top of the water tank and the water temperature in the middle of the water tank are already much lower than the water temperature set by the user. At this time, it is difficult to continue to supply hot water to meet the user's needs. In this regard, the embodiment of the present application will start the electric heating device to produce hot water.

[0077] It is worth noting that in order to increase the water supply, achieve rapid heating, and quickly increase the hot water output, the embodiment of the present application adds an upper electric heating device to the upper part of the water tank, while retaining the lower electric heating device, and adding an upper temperature sensing package to control the upper electric heating device; when the water temperature at the top of the water tank is lower than the preset threshold, and the water temperature at the top of the water tank and the water temperature in the middle of the water tank are both lower than the first trigger water temperature, that is, when the upper electric heating device and the lower electric heating device have energy needs at the same time, the lower electric heating device is not turned on, but only the upper electric heating device is turned on, and since the water outlet of the water tank is located at the upper position, therefore, the embodiment of the present application can first heat the water at the top of the water tank through the upper electric heater, which can effectively and quickly increase the hot water output and increase the hot water load generated by the unit every day. In addition, since only the upper electric heating device is turned on, it can ensure that the heat pump water heater saves more electricity each year while being able to achieve the water outlet temperature required by the user, thereby being able to improve the VEEC value when the heat pump water heater based on the STC value is switched to a commercial use scenario, thereby meeting customer needs.

[0078] In one embodiment, the method also includes the following steps: when the large water volume function is turned on, obtaining first energy demand judgment information, wherein the first energy demand judgment information includes at least one of the following: water temperature in the middle of the water tank, ambient temperature, and system control mode; when it is determined according to the first energy demand judgment information that there is energy demand for the lower electric heating device, prohibiting the lower electric heating device from being started, and maintaining the large water volume function on.

[0079] Specifically, when the large water volume function is turned on, if the lower electric heating has energy demand, the lower electric heating device will not be operated, and the large water volume function will be maintained, thereby meeting the VEEC value in commercial use scenarios.

[0080] In one embodiment, the method also includes the following steps: when the large water volume function is turned off, obtaining the second energy demand judgment information of the lower electric heater, wherein the second energy demand judgment information includes at least one of the following: water temperature in the middle of the water tank, ambient temperature, and system control mode; and controlling the working state of the lower electric heating device and the compressor according to the second energy demand judgment information.

[0081] Specifically, after exiting the large water volume function, the lower electric heating is operated according to whether there is energy demand for the lower electric heating; wherein the compressor and the lower electric heating device can be controlled to start according to the water temperature in the middle of the water tank, the ambient temperature, and the mode type of the system control mode. When it is determined that the system has energy demand according to the second energy demand judgment information, the lower electric heating device and the compressor are turned on; when it is determined that the system does not have energy demand according to the second energy demand judgment information, the lower electric heating device and the compressor are turned off.

[0082] Among them, the above-mentioned system control mode can be an electric heating mode, a hybrid mode or an economic mode, etc.

[0083] In one embodiment, the control logic of the compressor also includes the following steps: determining the maximum value of the water temperature in the middle of the water tank and the water temperature in the upper part of the water tank; when the maximum value is greater than or equal to the second trigger water temperature, controlling the compressor to stop, wherein the second trigger water temperature is lower than the user-set water temperature and greater than the first trigger water temperature.

[0084] Specifically, the compressor can be controlled according to the water temperature T5L in the middle of the water tank and the water temperature T5U1 in the upper part of the water tank. For example, when MAX(T5L, T5U1)≥(Ts-1), the heat pump is shut down.

[0085] In addition, if Figure 3 As shown, Figure 3 It is a flow chart of a control method of a heat pump water heater provided by another embodiment of the present application; the control method may include but is not limited to step S310, step S320 and step S330.

[0086] Step S310, obtaining the operation mode of the heat pump water heater;

[0087] Step S320: When the operation mode is other than the vacation mode and the shutdown mode, the water temperature at the upper part of the water tank is detected by the upper temperature sensing package, and the water temperature at the middle part of the water tank is detected by the middle temperature sensing package;

[0088] Step S330, start the upper electric heating device for heating.

[0089] In one embodiment, when the heat pump water heater is operating normally, the controller of the heat pump water heater will obtain the operating mode of the heat pump water heater. If the operating mode is not the vacation mode or the shutdown mode, it means that the user may use the heat pump water heater in the near future or currently. In this regard, the controller of the heat pump water heater will start the upper temperature sensing bag and the lower temperature sensing bag. The upper temperature sensing bag will detect the water temperature in the upper part of the water tank and transmit the corresponding water temperature signal to the controller of the heat pump water heater. At the same time, the lower temperature sensing bag will also detect the water temperature in the middle part of the water tank and transmit the corresponding water temperature signal to the controller of the heat pump water heater. device; then, the controller will obtain the water temperature at the top of the water tank and the water temperature in the middle of the water tank according to the received water temperature signal, and compare the water temperature at the top of the water tank with the preset threshold, and compare the water temperature at the top of the water tank with the water temperature in the middle of the water tank and the first trigger water temperature. If the water temperature at the top of the water tank is lower than the preset threshold and both the water temperature at the top of the water tank and the water temperature in the middle of the water tank are lower than the first trigger water temperature, it indicates that the water temperature of the water tank is much lower than the water temperature set by the user, that is, both the upper electric heating device and the lower electric heating device have energy needs. In this regard, in order to increase the VEEC value while heating quickly, the embodiment of the present application will only start the upper electric heating device for heating.

[0090] It should be noted that the vacation mode mentioned above can also be called holiday mode or energy-saving mode, which corresponds to a function that allows the user to save energy and reduce costs by reducing energy consumption when the water heater is not used for a long time. The vacation mode is particularly suitable for vacations, business trips or other long-term absences from home.

[0091] In addition, if Figure 4 As shown, Figure 4 This is a flow chart of a control method for a heat pump water heater provided by another embodiment of the present application; after starting the upper electric heating device for heating, the control method may also include but is not limited to step S410 and step S420.

[0092] Step S410, determining that the water temperature at the upper portion of the water tank is greater than or equal to a second trigger water temperature, wherein the second trigger water temperature is less than the user-set water temperature and greater than the first trigger water temperature;

[0093] Step S420, controlling the upper electric heating device to stop heating.

[0094] In one embodiment, after starting the upper electric heating device for heating, the controller of the heat pump water heater will continue to detect the upper water temperature of the water tank through the upper temperature sensing package. If the upper water temperature of the water tank rises to be greater than or equal to the second trigger water temperature, it indicates that the upper water temperature of the water tank has approached or reached the user-set water temperature, which can satisfy the user's water use experience. In this case, the embodiment of the present application will control the upper electric heating device to stop heating.

[0095] In addition, for the second trigger water temperature, its value should be slightly smaller than the water temperature set by the user and larger than the above-mentioned first trigger water temperature.

[0096] In addition, if Figure 5 As shown, Figure 5 This is a flow chart of a control method for a heat pump water heater provided by another embodiment of the present application; after starting the upper electric heating device for heating, the control method may also include but is not limited to step S510 and step S520.

[0097] Step S510: receiving a shutdown instruction;

[0098] Step S520: In response to the shutdown instruction, the upper electric heating device is controlled to stop heating.

[0099] In one embodiment, after the upper electric heating device is started for heating, if the controller of the heat pump water heater receives a shutdown command from the user, it indicates that the user does not need to use hot water at this time. In response, the controller of the heat pump water heater will control the upper electric heating device to stop heating.

[0100] In addition, if Figure 6 As shown, Figure 6 This is a flow chart of a control method for a heat pump water heater provided by another embodiment of the present application; after starting the upper electric heating device for heating, the control method may also include but is not limited to step S610 and step S620.

[0101] Step S610, receiving a fault signal from the upper temperature sensing package;

[0102] Step S620: In response to the fault signal, control the upper electric heating device to stop heating.

[0103] In one embodiment, after starting the upper electric heating device for heating, if the controller of the heat pump water heater receives a fault signal from the upper temperature sensing package, it indicates that the signal transmitted from the upper temperature sensing package to the controller is inaccurate. In this regard, for the normal operation of the system, the controller of the heat pump water heater will control the upper electric heating device to stop heating.

[0104] In addition, if Figure 7 As shown, Figure 7 This is a flow chart of a control method for a heat pump water heater provided by another embodiment of the present application; after starting the upper electric heating device for heating, the control method may also include but is not limited to step S710 and step S720.

[0105] Step S710, receiving a vacation mode instruction;

[0106] Step S720: In response to the vacation mode instruction, the upper electric heating device is controlled to stop heating, and the heat pump water heater is controlled to enter the vacation mode.

[0107] In one embodiment, after the upper electric heating device is started for heating, if the controller of the heat pump water heater receives a vacation mode command from the user, it indicates that the user will not need to use hot water for a long period of time. In this case, the controller of the heat pump water heater will control the upper electric heating device to stop heating.

[0108] Based on the control methods of the heat pump water heaters of the above-mentioned various embodiments, overall embodiments of the control methods of the heat pump water heaters of the present application are respectively proposed below.

[0109] First, to facilitate subsequent description, some parameters are defined as follows: T5U1 is the upper temperature of the water tank, T5L is the middle temperature of the water tank, and Ts is the water temperature set by the user.

[0110] In one embodiment, in order to increase the water supply, achieve rapid heating, and quickly increase the hot water output, an upper electric heating device is added to the upper part of the water tank, while the lower electric heating device is retained, an upper temperature sensing package is added to control the upper electric heating device separately, and the middle temperature sensing package controls the lower electric heating device and controls the start and stop of the heat pump. The function of turning on and off the upper electric heating device is designed as a separate module function, and the large water volume function is as follows:

[0111] 1. Entry conditions:

[0112] Run any mode other than vacation mode and shutdown mode, and T5U1<50℃ and T5U1<Ts-3 and T5L<Ts-3, wherein 50℃ corresponds to the above-mentioned preset threshold, and Ts-3 corresponds to the above-mentioned first trigger water temperature.

[0113] 2. Execute the action:

[0114] The upper electric heating device has energy demand (when the upper and lower electric heating devices have energy demand at the same time, only the upper electric heating device is turned on).

[0115] 3. Exit conditions: any one of them can be met:

[0116] 1) T5U1≥Ts-1, wherein Ts-1 corresponds to the second triggering water temperature mentioned above.

[0117] 2) Turn off the computer.

[0118] 3)T5U1 failure.

[0119] 4) Enter vacation mode.

[0120] After using the technical solution of the embodiment of the present application, it can be found through experiments that the embodiment of the present application can effectively and quickly increase the hot water output, increase the hot water load generated by the unit every day, and can ensure that the annual heat pump electricity saving is not less than 60% and the water outlet temperature is not less than 45C, thereby improving the VEEC value by 20%.

[0121] Based on the control methods of the heat pump water heaters in the above-mentioned embodiments, various embodiments of the controller, the heat pump water heater, the computer-readable storage medium and the computer program product of the present application are respectively proposed below.

[0122] like Figure 8 As shown, Figure 8 800 is a schematic diagram of a controller for executing a control method provided by an embodiment of the present application. The controller 800 implemented in the present application includes: a processor 810, a memory 820, and a computer program stored in the memory 820 and executable on the processor 810, wherein: Figure 8 In the figure, a processor 810 and a memory 820 are taken as an example.

[0123] The processor 810 and the memory 820 may be connected via a bus or other means. Figure 8 The example of connecting through bus is taken in the following.

[0124] The memory 820, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 820 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 820 may optionally include a memory 820 remotely arranged relative to the processor 810, and these remote memories 820 may be connected to the controller 800 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0125] Those skilled in the art will understand that Figure 8 The device structure shown in the figure does not constitute a limitation on the controller 800, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0126] exist Figure 8 In the controller 800 shown, the processor 810 can be used to call the control program stored in the memory 820 to implement the above control method. Specifically, the non-transient software program and instructions required to implement the control method of the above embodiment are stored in the memory 820, and when executed by the processor 810, the control method of the above embodiment is executed.

[0127] It is worth noting that since the controller 800 of the embodiment of the present application can execute the control method of any of the above embodiments, the specific implementation methods and technical effects of the controller 800 of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of any of the above embodiments.

[0128] In addition, an embodiment of the present application further provides a heat pump water heater, which includes the controller of the above embodiment.

[0129] It is worth noting that since the heat pump water heater of the embodiment of the present application includes the controller of the above embodiment, and the controller of the above embodiment can execute the control method of any of the above embodiments, the specific implementation methods and technical effects of the heat pump water heater of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of any of the above embodiments.

[0130] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the above-described control method. Figures 2 to 7 The method steps in .

[0131] It is worth noting that since the computer-readable storage medium of the embodiments of the present application can execute the control method of any of the above embodiments, the specific implementation methods and technical effects of the computer-readable storage medium of the embodiments of the present application can refer to the specific implementation methods and technical effects of the control method of any of the above embodiments.

[0132] In addition, an embodiment of the present application further provides a computer program product, including a computer program or computer instructions, the computer program or computer instructions are stored in a computer-readable storage medium, the processor of the computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions, so that the computer device executes the above-described control method. Figures 2 to 7 The method steps in .

[0133] It is worth noting that since the computer program product of the embodiments of the present application can execute the control method of any of the above embodiments, the specific implementation methods and technical effects of the computer program product of the embodiments of the present application can refer to the specific implementation methods and technical effects of the control method of any of the above embodiments.

[0134] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media generally include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0135] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions under the shared conditions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A control method for a heat pump water heater, characterized in that: The heat pump water heater is provided with a water tank, and the water tank is provided with an upper electric heating device, a lower electric heating device, an upper temperature sensing package and a middle temperature sensing package, the upper electric heating device and the upper temperature sensing package are both located at the upper position of the water tank, the lower electric heating device is located at the lower position of the water tank, and the middle temperature sensing package is located at the middle position of the water tank; the method comprises: The upper temperature sensing package is used to detect the water temperature in the upper part of the water tank, and the middle temperature sensing package is used to detect the water temperature in the middle part of the water tank; When the water temperature at the top of the water tank is lower than a preset threshold, and both the water temperature at the top of the water tank and the water temperature in the middle of the water tank are lower than the first trigger water temperature, the large water volume function is turned on. Under the large water volume function, the upper electric heating device is started for heating, and the first trigger water temperature is lower than the water temperature set by the user.

2. The method according to claim 1, characterized in that The method further comprises: When the large water volume function is turned on, first energy demand judgment information is obtained, wherein the first energy demand judgment information includes at least one of the following: water temperature in the middle of the water tank, ambient temperature, and system control mode; When it is determined that the lower electric heating device has energy demand based on the first energy demand judgment information, starting the lower electric heating device is prohibited and the large water volume function is maintained turned on.

3. The method according to claim 1, characterized in that The method further comprises: When the large water volume function is turned off, obtaining second energy demand judgment information of the lower electric heater, wherein the second energy demand judgment information includes at least one of the following: the water temperature in the middle of the water tank, the ambient temperature, and the system control mode; The working states of the lower electric heating device and the compressor are controlled according to the second energy demand judgment information.

4. The method according to claim 3, characterized in that The controlling the working state of the lower electric heating device and the compressor according to the second energy demand determination information includes at least one of the following: When it is determined according to the second energy demand judgment information that the system has energy demand, turning on the lower electric heating device and the compressor; When it is determined that there is no energy demand in the system according to the second energy demand judgment information, the lower electric heating device and the compressor are turned off and on.

5. The method according to claim 4, characterized in that The method further comprises: Determine the maximum value between the water temperature in the middle of the water tank and the water temperature in the upper part of the water tank; When the maximum value is greater than or equal to a second trigger water temperature, the compressor is controlled to stop, wherein the second trigger water temperature is lower than the user-set water temperature and higher than the first trigger water temperature.

6. The method according to claim 1, characterized in that Before detecting the water temperature at the upper part of the water tank by the upper temperature sensing package, the method further includes: Obtaining the operation mode of the heat pump water heater; The operating mode is determined to be a mode other than the vacation mode and the shutdown mode.

7. The method according to any one of claims 1 to 6, characterized in that: After starting the upper electric heating device to heat, the method further includes: When the water temperature at the upper part of the water tank is greater than or equal to the second trigger water temperature, the upper electric heating device is controlled to stop heating, wherein the second trigger water temperature is lower than the user-set water temperature and greater than the first trigger water temperature.

8. The method according to any one of claims 1 to 6, characterized in that After starting the upper electric heating device to heat, the method further includes: Receive shutdown command; In response to the shutdown instruction, the upper electric heating device is controlled to stop heating.

9. The method according to any one of claims 1 to 6, characterized in that: After starting the upper electric heating device to heat, the method further includes: Receiving a fault signal from the upper temperature sensing package; In response to the fault signal, the upper electric heating device is controlled to stop heating.

10. The method according to any one of claims 1 to 6, characterized in that: After starting the upper electric heating device to heat, the method further includes: Receiving a vacation mode instruction; In response to the vacation mode instruction, the upper electric heating device is controlled to stop heating, and the heat pump water heater is controlled to enter the vacation mode.

11. A controller, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method of the heat pump water heater according to any one of claims 1 to 10 when executing the computer program.

12. A heat pump water heater, characterized in that: Comprising a controller as claimed in claim 11.

13. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to execute the control method of the heat pump water heater according to any one of claims 1 to 10.

14. A computer program product comprising a computer program or computer instructions, characterized in that The computer program or the computer instructions are stored in a computer-readable storage medium, and a processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium. The processor executes the computer program or the computer instructions, so that the computer device executes the control method of the heat pump water heater as described in any one of claims 1 to 10.

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