Start-up control method of heat pump water heater, heat pump water heater and storage medium

Abstract

The application belongs to the technical field of household appliances, and particularly relates to a starting control method of a heat pump water heater, the heat pump water heater and a storage medium, and is used for solving the technical problem of lacking the starting control method of the air source heat pump water heater in multiple different modes. The starting control method comprises the following steps: determining whether the starting condition of the set starting mode is met according to the preset target temperature and the corresponding actual temperature in the set starting mode; if the starting condition of the set starting mode is met, switching the four-way reversing valve to the corresponding communication state according to the set starting mode, and adjusting the first control valve, the second control valve and the third control valve to the preset opening degree. The application can improve the stability and reliability of the heat pump water heater when starting in multiple different modes.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a start-up control method for a heat pump water heater, a heat pump water heater, and a storage medium. Background Technology

[0002] With the continuous development of science and technology and the continuous improvement of people's living standards, heat pump water heaters have gradually entered more and more homes and offices.

[0003] Currently, traditional heat pump water heaters typically only provide hot water, while indoor cooling and heating are usually handled by separate cooling and heating systems. Traditional heat pump water heaters and cooling / heating systems not only have low equipment utilization rates but also occupy significant installation space, resulting in low space utilization. To address this, a new type of heat pump water heater has been developed that integrates hot water production, cooling, and heating functions into one unit, making it a multi-functional appliance and improving both equipment and space utilization.

[0004] However, the start-up control methods for heat pump water heaters that can operate in multiple modes under different modes still need further research. Summary of the Invention

[0005] This application provides a start-up control method for a heat pump water heater, a heat pump water heater, and a storage medium, which can improve the stability and reliability of the heat pump water heater when starting in various different modes.

[0006] In a first aspect, embodiments of this application provide a method for starting and controlling a heat pump water heater. The heat pump water heater includes a refrigerant circulation loop and a hot water tank. The refrigerant circulation loop includes a compressor, a four-way reversing valve, a first heat exchanger, a second heat exchanger, and a third heat exchanger. One end of the first heat exchanger is connected to one end of the compressor via a first control valve and a four-way reversing valve in sequence. The other end of the first heat exchanger is connected to one end of the third heat exchanger via a second control valve. The other end of the third heat exchanger is connected to the other end of the compressor via a four-way reversing valve. One end of the second heat exchanger is connected between the output end of the compressor and the four-way reversing valve. The other end of the second heat exchanger is connected between the second control valve and the third heat exchanger via a third control valve. The first heat exchanger is used to exchange heat between the refrigerant inside and the indoor environment. The second heat exchanger is used to exchange heat between the refrigerant inside and the hot water tank. The third heat exchanger is used to exchange heat between the refrigerant inside and the outdoor environment.

[0007] Startup control methods include:

[0008] Based on the preset target temperature and the corresponding actual temperature in the set start-up mode, determine whether the start-up conditions of the set start-up mode are met. The start-up mode is one of hot water production mode, cooling mode, heating mode, or hot water production and heating mode. The actual temperature includes at least one of the actual hot water temperature in the hot water tank and the actual ambient temperature corresponding to the indoor environment.

[0009] If the start conditions of the set start mode are met, the four-way directional valve will be switched to the corresponding connected state according to the set start mode, and the first control valve, the second control valve and the third control valve will be adjusted to the preset opening degree.

[0010] In the preferred embodiment of the above-mentioned start-up control method for heat pump water heaters, when the start-up mode is hot water production and heating mode, the start-up conditions of the set start-up mode are determined based on the preset target temperature and the corresponding actual temperature in the set start-up mode, specifically including:

[0011] Determine whether the hot water production start-up conditions of the hot water production and heating modes are met based on the actual hot water temperature and the target hot water temperature set in the hot water production and heating modes.

[0012] Determine whether the heating start-up conditions for the hot water production and heating modes are met based on the actual ambient temperature and the heating target temperature set in the hot water production and heating modes.

[0013] If both the hot water and heating start-up conditions are met simultaneously, the four-way reversing valve will be switched to the corresponding connected state according to the set start-up mode, and the first, second, and third control valves will be adjusted to the preset opening degree, specifically including:

[0014] Switch the four-way reversing valve to a state where the compressor output is connected to the first heat exchanger and the compressor input is connected to the third heat exchanger, and adjust the first control valve, the second control valve and the third control valve to the preset opening degree corresponding to the common start-up state of hot water production and heating modes.

[0015] After adjusting the first control valve, the second control valve, and the third control valve to the preset opening degree corresponding to the joint start-up state of hot water production and heating modes and maintaining it for a first preset time, adjust the first control valve, the second control valve, and the third control valve to the preset opening degree corresponding to the joint operation state of hot water production and heating modes.

[0016] In the preferred embodiment of the above-mentioned start-up control method for heat pump water heaters, adjusting the first control valve, the second control valve, and the third control valve to a preset opening degree corresponding to the simultaneous start-up state of hot water production and heating modes specifically includes:

[0017] Adjust the first control valve, the second control valve, and the third control valve to their maximum opening.

[0018] In the preferred embodiment of the above-mentioned start-up control method for heat pump water heaters, adjusting the first control valve, the second control valve, and the third control valve to a preset opening degree corresponding to the simultaneous start-up state of hot water production and heating modes specifically includes:

[0019] The first control valve is adjusted to its maximum opening. The second control valve is adjusted to a preset opening corresponding to the simultaneous start-up state of the hot water and heating modes, based on at least one of the compressor frequency, the outdoor temperature at the third heat exchanger, and the difference between the target heating temperature set in the hot water and heating modes and the actual ambient temperature. The third control valve is adjusted to a preset opening corresponding to the simultaneous start-up state of the hot water and heating modes, based on at least one of the compressor frequency, the outdoor temperature at the third heat exchanger, and the difference between the target hot water temperature set in the hot water and heating modes and the actual hot water temperature.

[0020] In the preferred technical solution of the above-mentioned start-up control method for heat pump water heaters, the preset opening degree of the second control valve, the compressor frequency, the outdoor temperature at the third heat exchanger, and the difference between the heating target temperature set in the hot water production and heating modes and the actual ambient temperature, corresponding to the simultaneous start-up state of hot water production and heating modes, satisfy the following relationships:

[0021] V1 = a1 × f + b1 × T 环 +c1(T0-T1)+d1

[0022] Where V1 is the preset opening degree of the second control valve corresponding to the simultaneous start-up state of hot water and heating modes, f is the compressor frequency, and T is the compressor frequency. 环 T0 is the outdoor temperature, T1 is the target heating temperature set in the hot water and heating modes, a1, b1, c1 and d1 are the corresponding adjustment coefficients.

[0023] In the preferred technical solution of the above-mentioned start-up control method for heat pump water heaters, the preset opening degree of the third control valve, the compressor frequency, the outdoor temperature at the third heat exchanger, and the difference between the target hot water temperature and the actual hot water temperature set in the hot water and heating modes satisfy the following relationships:

[0024] V² = a² × f + b² × T 环 +c2(t0-t1)+d2

[0025] Where V2 is the preset opening degree of the third control valve corresponding to the simultaneous start-up state of hot water and heating modes, f is the compressor frequency, and T is the compressor frequency. 环 t0 is the outdoor temperature, t1 is the target hot water temperature set in the hot water production and heating modes, a2, b2, c2 and d2 are the corresponding adjustment coefficients.

[0026] In the preferred technical solution of the above-mentioned start-up control method for heat pump water heaters, if only one of the start-up conditions for hot water production and heating modes is met, the four-way reversing valve is switched to the corresponding connected state according to the set start-up mode, and the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree, specifically including:

[0027] Switch the four-way reversing valve to a state where the compressor output is connected to the first heat exchanger and the compressor input is connected to the third heat exchanger.

[0028] The first and third control valves are adjusted to their maximum openings according to the priority hot water production state of the hot water production and heating modes when the hot water production start-up conditions are met individually, or the first and second control valves are adjusted to their maximum openings according to the priority heating state of the hot water production and heating modes when the heating start-up conditions are met individually.

[0029] In the preferred technical solution of the above-mentioned start-up control method for heat pump water heaters, after one of the hot water start-up conditions and the heating start-up conditions of the hot water production and heating modes is met, adjusting the first control valve, the second control valve, and the third control valve to the preset opening degree further includes:

[0030] Shut down the heat pump water heater until it reaches a steady state.

[0031] After the heat pump water heater stops and reaches a steady state, it re-determines whether the hot water production start-up conditions of the hot water production and heating modes are met based on the actual hot water temperature and the target hot water temperature set in the hot water production and heating modes, and determines whether the heating start-up conditions of the hot water production and heating modes are met based on the actual ambient temperature and the target heating temperature set in the hot water production and heating modes.

[0032] If both the hot water production start-up conditions and the heating start-up conditions for both hot water production and heating modes are met simultaneously, then:

[0033] Switch the four-way reversing valve to a state where the compressor output is connected to the first heat exchanger and the compressor input is connected to the third heat exchanger, and adjust the first control valve, the second control valve and the third control valve to the preset opening degree corresponding to the common start-up state of hot water production and heating modes.

[0034] After adjusting the first control valve, the second control valve, and the third control valve to the preset opening degree corresponding to the joint start-up state of hot water production and heating modes and maintaining it for a first preset time, adjust the first control valve, the second control valve, and the third control valve to the preset opening degree corresponding to the joint operation state of hot water production and heating modes.

[0035] In the preferred technical solution of the above-mentioned start-up control method for heat pump water heater, the refrigerant circulation loop further includes a fourth control valve, an economizer, and a fifth control valve. The first heat exchanger is connected to the first heat exchanger in sequence through the second control valve, the economizer, and the fourth control valve. The input end of the compressor is connected to the fourth control valve in sequence through the economizer and the fifth control valve. The other end of the second heat exchanger is connected between the economizer and the second control valve through the third control valve.

[0036] After one of the hot water start-up conditions and the heating start-up conditions for both hot water and heating modes is met, adjusting the first, second, and third control valves to their preset opening degrees also includes:

[0037] Adjust one of the second and third control valves that is not adjusted to the maximum opening to the maximum opening.

[0038] After the first, second, and third control valves are all adjusted to their maximum opening and maintained for a second preset time, the compressor frequency is adjusted to the preset frequency corresponding to the simultaneous start-up state of hot water and heating modes, and the opening of the fourth and fifth control valves is adjusted according to the compressor frequency.

[0039] After the compressor frequency has been maintained at the preset frequency corresponding to the simultaneous start-up state of hot water production and heating modes for a third preset time, the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree corresponding to the simultaneous operation state of hot water production and heating.

[0040] In the preferred embodiment of the above-mentioned start-up control method for heat pump water heaters, when the start-up mode is hot water production mode, the start-up conditions of the set start-up mode are determined based on the actual temperature and the preset target temperature in the set start-up mode, specifically including:

[0041] Determine whether the start-up conditions for the hot water production mode are met based on the actual ambient temperature and the target hot water temperature set in the hot water production mode.

[0042] If the start-up conditions for hot water production mode are met, the four-way reversing valve will be switched to the corresponding connected state according to the set start-up mode, and the first control valve, second control valve, and third control valve will be adjusted to the preset opening degree, specifically including:

[0043] Switch the four-way reversing valve to a state where the compressor output is connected to the first heat exchanger and the compressor input is connected to the third heat exchanger, and adjust the third control valve to its maximum opening and the second control valve to its minimum opening.

[0044] In the preferred technical solution of the above-mentioned start-up control method for heat pump water heaters, if the start-up conditions for hot water production mode are met, adjusting the first control valve, the second control valve, and the third control valve to a preset opening degree further includes:

[0045] Compare the outdoor temperature at the third heat exchanger with the upper limit of the outdoor ambient temperature in the heating mode.

[0046] If the outdoor temperature is less than or equal to the upper limit of the outdoor ambient temperature for the heating mode, the first control valve will be adjusted to its maximum opening.

[0047] In the preferred technical solution of the above-mentioned start-up control method for heat pump water heaters, if the start-up conditions for hot water production mode are met, adjusting the first control valve, the second control valve, and the third control valve to a preset opening degree further includes:

[0048] If the outdoor temperature is higher than the upper limit of the outdoor ambient temperature for the heating mode, the first control valve will be switched to the closed state.

[0049] In the preferred embodiment of the above-mentioned start-up control method for heat pump water heaters, when the start-up mode is heating mode or cooling mode, the start-up conditions of the set start-up mode are determined based on the actual temperature and the preset target temperature in the set start-up mode, specifically including:

[0050] Determine whether the starting conditions for the heating mode are met based on the actual ambient temperature and the target heating temperature set in the heating mode; or determine whether the starting conditions for the cooling mode are met based on the actual ambient temperature and the target cooling temperature set in the cooling mode.

[0051] If the conditions for starting the heating mode are met, the four-way reversing valve is switched to the corresponding connected state according to the set start mode, and the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree. Specifically, the four-way reversing valve is switched to a state in which the output end of the compressor is connected to the first heat exchanger and the input end of the compressor is connected to the third heat exchanger, and the first control valve and the second control valve are adjusted to the maximum opening degree, and the third control valve is adjusted to the small opening degree.

[0052] And / or, if the start-up conditions for the cooling mode are met, the four-way reversing valve is switched to the corresponding connected state according to the set start-up mode, and the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree. Specifically, this includes: switching the four-way reversing valve to a state in which the input end of the compressor is connected to the first heat exchanger and the output end of the compressor is connected to the third heat exchanger, and adjusting the first control valve to the maximum opening degree, adjusting the second control valve to the throttling state, and adjusting the third control valve to the small opening degree.

[0053] The start-up control method for a heat pump water heater provided in this application first determines whether the start-up conditions of the set start-up mode are met by using the preset target temperature and the corresponding actual temperature in the set start-up mode. After the start-up conditions of the set start-up mode are met, the four-way reversing valve is controlled to switch to the corresponding connected state, and the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree, so that the refrigerant in the refrigerant circulation loop can circulate in the refrigerant circulation loop according to the set start-up mode. In this way, the heat pump water heater can start up relatively stably and reliably in any of the following modes: hot water mode, cooling mode, heating mode, or both hot water mode and heating mode.

[0054] Secondly, embodiments of this application provide a heat pump water heater, which employs the start-up control method of the heat pump water heater as described in any of the above embodiments.

[0055] Thirdly, embodiments of this application provide a storage medium storing computer execution instructions, which, when executed by a processor, are used to implement the start-up control method for a heat pump water heater as described in any of the above embodiments.

[0056] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that the heat pump water heater start-up control method, the heat pump water heater and the storage medium provided by the embodiments of this application can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of the structure of a heat pump water heater provided in an embodiment of this application;

[0059] Figure 2 A flowchart illustrating a start-up control method for a heat pump water heater provided in this application embodiment;

[0060] Figure 3 A flowchart illustrating another start-up control method for a heat pump water heater provided in this application embodiment;

[0061] Figure 4A flowchart illustrating the start-up mode of a heat pump water heater in the embodiment of this application when the start-up mode is hot water production and heating mode;

[0062] Figure 5 A flowchart illustrating the startup mode of a heat pump water heater startup control method provided in this application embodiment when the startup mode is hot water production and heating mode;

[0063] Figure 6 A flowchart illustrating the start-up mode of a heat pump water heater in a hot water production mode, as provided in this application embodiment;

[0064] Figure 7 A flowchart illustrating the startup mode of a heat pump water heater startup control method provided in this application embodiment when the startup mode is heating mode;

[0065] Figure 8 This is a flowchart illustrating the startup mode of a heat pump water heater startup control method provided in this application embodiment when the startup mode is cooling mode.

[0066] In the attached image:

[0067] 100. Processor; 200. Hot water tank; 210. First temperature sensor; 220. Second temperature sensor; 310. Compressor; 320. Four-way reversing valve; 330. First heat exchanger; 340. Second heat exchanger; 350. Third heat exchanger; 360. Economizer; 371. First control valve; 372. Second control valve; 373. Third control valve; 374. Fourth control valve; 375. Fifth control valve; 400. Fan; 500. Circulation pipeline; 510. Third temperature sensor; 520. Fourth temperature sensor. Detailed Implementation

[0068] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios. Second, it should be noted that in the description of the present invention, terms such as "inner" and "outer," indicating direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation of the present invention. Furthermore, it should be noted that in the description of the present invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0069] As described in the background section, traditional heat pump water heaters typically only provide hot water, while indoor cooling and heating are usually handled by air conditioning or other cooling and heating equipment. However, neither traditional heat pump water heaters nor cooling / heating equipment operate at full capacity 24 hours a day; both have periods of inactivity. This results in low equipment utilization rates for traditional heat pump water heaters and cooling / heating equipment. Furthermore, traditional heat pump water heaters and cooling / heating equipment are two separate systems, occupying significant installation space and further reducing space utilization. To address this, researchers have proposed a novel heat pump water heater. This new heat pump water heater features multiple operating modes, including hot water production, cooling, heating, and both, offering multi-functionality and simultaneously meeting users' needs for heating, cooling, and hot water. Compared to traditional heat pump water heaters and cooling / heating equipment, this not only improves equipment and energy efficiency but also reduces the required installation space, thus increasing overall space utilization. However, the start-up control method for novel heat pump water heaters still needs further research so that the novel heat pump water heaters can have better stability and reliability when starting in different modes.

[0070] To address the aforementioned technical problems, this application provides a start-up control method for a heat pump water heater. First, by using a preset target temperature and the corresponding actual temperature in a set start-up mode, it is determined whether the start-up conditions of the set start-up mode are met. If the start-up conditions are met, the four-way reversing valve is switched to the corresponding connected state, and the first, second, and third control valves are adjusted to preset opening degrees. This allows the refrigerant in the refrigerant circulation loop to circulate according to the set start-up mode. In this way, the heat pump water heater can start up relatively stably and reliably in any of the following modes: hot water mode, cooling mode, heating mode, or both hot water and heating mode. This improves the stability and reliability of the heat pump water heater when starting in various different modes.

[0071] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0072] Figure 1 A schematic diagram of a heat pump water heater is shown. (See also...) Figure 1 As shown in the figure, this application provides a heat pump water heater, which may include a refrigerant circulation loop, a hot water tank 200, and a processor 100. The refrigerant circulation loop includes a compressor 310, a four-way reversing valve 320, a first heat exchanger 330, a second heat exchanger 340, and a third heat exchanger 350. One end of the first heat exchanger 330 is connected to one end of the compressor 310 in sequence through a first control valve 371 and the four-way reversing valve 320. The other end of the first heat exchanger 330 is connected to one end of the third heat exchanger 350 through a second control valve 372. The other end of the third heat exchanger 350 is connected to the other end of the compressor 310 through the four-way reversing valve 320. The second heat exchanger 340 is connected at one end between the output end of the compressor 310 and the four-way reversing valve 320, and at the other end between the second control valve 372 and the third heat exchanger 350 via the third control valve 373. The first heat exchanger 330 is used for heat exchange between its refrigerant and the indoor environment, the second heat exchanger 340 is used for heat exchange between its refrigerant and the hot water tank 200, and the third heat exchanger 350 is used for heat exchange between its refrigerant and the outdoor environment. The processor 100 can communicate with and control the compressor 310, the four-way reversing valve 320, the first control valve 371, the second control valve 372, and the third control valve 373.

[0073] It is understandable that a heat pump water heater can also be called an air source heat pump water heater. A heat pump water heater can be an integrated unit, in which the first heat exchanger 330, the second heat exchanger 340, and the third heat exchanger 350 are all housed in a single enclosure, which can be located outdoors. A heat pump water heater can also be a split-type unit, where the third heat exchanger 350 can be located outdoors, and the first and second heat exchangers 330 and 340 can be located indoors or outdoors. When the first heat exchanger 330 is located indoors, it can directly exchange heat with the indoor environment, or it can exchange heat with the indoor environment through intermediate heat exchange devices such as the circulation pipe 500 arranged indoors. In this case, the first heat exchanger 330 first exchanges heat with the intermediate heat exchange devices such as the circulation pipe 500, and then exchanges heat with the indoor environment through the circulation pipe 500 and other intermediate heat exchange devices. When the first heat exchanger 330 is located outdoors, it can exchange heat with the indoor environment through intermediate heat exchange devices such as the circulation pipe 500, which is at least partially located indoors. A circulation pump, valves, etc., can be installed on the circulation pipe 500. The first heat exchanger 330 can be a water-side heat exchanger installed on the circulation pipe 500. The second heat exchanger 340 can be located at the hot water tank 200.

[0074] The first control valve 371, the second control valve 372, and the third control valve 373 can all be adjusted to any opening degree between 0% and 100% under the control of the processor 100. That is, the first control valve 371, the second control valve 372, and the third control valve 373 can be in a fully closed state, a fully open state, or a partially open state. The specific opening degree of each control valve can be determined according to the set start-up mode. The four ends of the four-way valve can be connected to the output end of the compressor 310, the input end of the compressor 310, the first heat exchanger 330, and the third heat exchanger 350, respectively. Under the control of the processor 100, the four-way reversing valve 320 can, according to the set start-up mode, connect the output end of the compressor 310 to the first heat exchanger 330 and the input end of the compressor 310 to the third heat exchanger 350; or connect the output end of the compressor 310 to the third heat exchanger 350 and the input end of the compressor 310 to the first heat exchanger 330. This allows the flow direction of the refrigerant in the refrigerant circulation loop to switch between indoor cooling and heating.

[0075] When hot water is needed, the refrigerant output from compressor 310 flows sequentially through the second heat exchanger 340 and the third heat exchanger 350 before returning to compressor 310. In this case, the second heat exchanger 340 functions as a condenser, and the third heat exchanger 350 functions as an evaporator. When heating is needed, the refrigerant output from compressor 310 flows sequentially through the first heat exchanger 330 and the third heat exchanger 350 before returning to compressor 310. In this case, the first heat exchanger 330 functions as a condenser, and the third heat exchanger 350 functions as an evaporator. When cooling is needed, the refrigerant output from compressor 310 flows sequentially through the third heat exchanger 340 and the third heat exchanger 350 before returning to compressor 310. After passing through the first heat exchanger 330 and the third heat exchanger 350, the refrigerant flows back into the compressor 310. At this time, the third heat exchanger 350 can act as a condenser, and the first heat exchanger 330 can act as an evaporator. When hot water and heating are required simultaneously, part of the refrigerant output from the compressor 310 flows back into the compressor 310 after passing through the first heat exchanger 330 and the third heat exchanger 350 in sequence, and the other part flows back into the compressor 310 after passing through the second heat exchanger 340 and the third heat exchanger 350 in sequence. At this time, the first heat exchanger 330 and the second heat exchanger 340 can act as condensers, and the third heat exchanger 350 can act as an evaporator.

[0076] In some possible implementations, the refrigerant circulation loop further includes a fourth control valve 374, an economizer 360, and a fifth control valve 375. A first heat exchanger 330 is connected sequentially to a second control valve 372, an economizer 360, and a fourth control valve 374. The input end of the compressor 310 is connected sequentially to the fourth control valve 374 via the economizer 360 and the fifth control valve 375. The other end of the second heat exchanger 340 is connected between the economizer 360 and the second control valve 372 via a third control valve 373. The fourth control valve 374 and the fifth control valve 375 can communicate with and be controlled by the processor 100. It is understood that the economizer 360 includes a first end and a second end that are interconnected, as well as a third end and a fourth end that are interconnected. The first end is connected to the second control valve 372, the second end is connected to the fourth control valve 374, the third end is connected to the input end of the compressor 310, and the fourth end is connected to the fifth control valve 375. The input terminal of the compressor 310 connected to the economizer 360 and the input terminal of the compressor 310 connected to the four-way reversing valve 320 can be the same input terminal or different input terminals. The fourth control valve 374 and the fifth control valve 375 can also be adjusted to any opening degree between 0% and 100% under the control of the processor 100, that is, the first control valve 371, the second control valve 372, and the third control valve 373 can be in a fully closed state, a fully open state, or a partially open state.

[0077] The second control valve 372, the third control valve 373, and the fourth control valve 374 can all be adjusted to a throttling state to achieve a throttling effect in their respective positions. For example, when hot water and / or heating is required, the fourth control valve 374 can be adjusted to a throttling state; when cooling is required, the second control valve 372 can be adjusted to a throttling state. Alternatively, a throttling component can be installed in the refrigerant circulation loop to achieve the throttling effect.

[0078] The first control valve 371 can be an electric valve, the second control valve 372 can be called a heating valve, the third control valve 373 can be called a hot water valve, the fourth control valve 374 can be called a main valve, and the fifth control valve 375 can be called an auxiliary valve.

[0079] For example, the third heat exchanger 350 is a finned heat exchanger, and the heat pump water heater also includes a fan 400 disposed at the third heat exchanger 350. The fan 400 can blow or draw air toward the third heat exchanger 350 to enhance the heat exchange effect of the third heat exchanger 350.

[0080] In some examples, the hot water tank 200 is also equipped with a first temperature sensor 210 for detecting the temperature of the hot water tank 200. This makes it easy to monitor the actual hot water temperature of the hot water tank 200 in real time.

[0081] In some examples, the hot water tank 200 is also equipped with a second temperature sensor 220 for detecting the temperature of the hot water tank 200. The first temperature sensor 210 and the second temperature sensor 220 are respectively located at the upper and lower parts of the hot water tank 200. In this way, the actual hot water temperature is determined by jointly using the temperatures obtained from the first temperature sensor 210 and the second temperature sensor 220, resulting in a more accurate determination of the actual hot water temperature and reducing the influence of the temperature difference between the upper and lower parts of the hot water tank 200 on the determination of the actual hot water temperature.

[0082] In some examples, the heat pump water heater also includes a third temperature sensor 510, which is used to detect the actual ambient temperature corresponding to the indoor environment. This facilitates real-time monitoring of the actual ambient temperature. It is understood that the third temperature sensor 510 can be placed indoors and used to detect the indoor ambient temperature; in this case, the actual ambient temperature can be the temperature of the indoor environment. When the first heat exchanger 330 exchanges heat with the indoor environment through intermediate heat exchange devices such as the circulation pipe 500, the third temperature sensor 510 can be placed on the intermediate heat exchange devices such as the circulation pipe 500 and can be used to detect the temperature of the intermediate heat exchange devices such as the circulation pipe 500; the actual ambient temperature can be the temperature of the intermediate heat exchange devices such as the circulation pipe 500. For example, the third temperature sensor 510 can be placed inside the circulation pipe 500 to detect the temperature of the circulating medium inside the circulation pipe 500; in this case, the actual ambient temperature can be the temperature of the circulating medium inside the circulation pipe 500.

[0083] In some examples, a fourth temperature sensor 520 is also provided on the circulation pipe 500. The circulation pipe 500 includes an inlet section connected to the outlet end of the circulating medium of the first heat exchanger 330, and a return section connected to the inlet end of the circulating medium of the first heat exchanger 330. The circulating medium is used to exchange heat with the indoor environment and the refrigerant in the first heat exchanger 330, and flows from the first heat exchanger 300 into the circulation pipe 500 through the inlet section, and then flows back into the first heat exchanger 330 through the return section. A third temperature sensor 510 and a fourth temperature sensor 520 are respectively located in the inlet section and the return section, and are used to detect the temperature of the circulating medium in the inlet section and the return section, respectively. In this way, the temperatures obtained by the third temperature sensor 510 and the fourth temperature sensor 520 are used together to determine the actual ambient temperature, making the determined actual ambient temperature more accurate and reducing the influence of temperature differences at different locations in the circulation pipe 500 on the determination of the actual ambient temperature.

[0084] Figure 2 This is a flowchart illustrating a start-up control method for a heat pump water heater provided in an embodiment of this application. Figure 2 As shown, the start-up control method for heat pump water heaters includes:

[0085] S100: Based on the preset target temperature in the set start-up mode and the corresponding actual temperature, determine whether the start-up conditions of the set start-up mode are met. The start-up mode can be one of hot water production mode, cooling mode, heating mode, or both hot water production and heating mode. The actual temperature includes at least one of the actual hot water temperature in the hot water tank 200 and the corresponding actual ambient temperature of the indoor environment. Thus, after setting the start-up mode, the actual temperature and the preset target temperature in the set start-up mode are used to determine whether the heat pump water heater meets the start-up conditions of the set start-up mode. This allows for a judgment on whether it can start according to the hot water production mode, cooling mode, heating mode, or both hot water production and heating mode, ensuring that the heat pump water heater can start smoothly according to the set start-up mode, thereby improving the stability and reliability of the heat pump water heater when starting in various different modes.

[0086] It should be noted that the target temperature corresponds to the actual temperature. In cooling / heating mode, the target temperature is the cooling target temperature set in the cooling mode corresponding to the actual ambient temperature; in heating mode, the target temperature is the heating target temperature set in the heating mode corresponding to the actual ambient temperature; in hot water mode, the target temperature is the hot water target temperature set in the hot water mode corresponding to the actual hot water temperature; in both hot water and heating modes, the target temperature includes both the heating target temperature set in the hot water and heating modes corresponding to the actual ambient temperature and the hot water target temperature set in the hot water and heating modes corresponding to the actual hot water temperature.

[0087] When the first heat exchanger 330 directly exchanges heat with the indoor environment, the actual ambient temperature can be the indoor temperature. Correspondingly, the target cooling and heating temperatures for each start-up mode can be set based on the indoor ambient temperature. When the first heat exchanger 330 exchanges heat with the indoor environment through intermediate heat exchange devices such as the circulation pipe 500, the actual ambient temperature can be the temperature of the intermediate heat exchange devices such as the circulation pipe 500. Correspondingly, the target cooling and heating temperatures for each start-up mode can be set based on the temperature of the intermediate heat exchange devices such as the circulation pipe 500. For example, the actual ambient temperature can be the temperature of the circulating medium in the circulation pipe 500, and correspondingly, the target cooling and heating temperatures for each start-up mode can be set based on the temperature of the circulating medium in the circulation pipe 500.

[0088] It is understood that, prior to step S100, the process includes setting a startup mode. The specific method for setting the startup mode can be found in descriptions of related technologies, particularly in heat pump water heaters, and is not further limited in this embodiment. For example, the startup mode can be set based on received control commands or similar methods.

[0089] In some examples, the start-up conditions of the set start-up mode are determined based on the actual temperature corresponding to the start-up mode, as well as the preset target temperature and hysteresis temperature. Understandably, when the actual temperature corresponding to the start-up mode reaches the preset target temperature, the heat pump water heater will switch to a stop or standby state. Afterward, the actual temperature will change in the opposite direction to the heat pump water heater's operating state. Once the value of the opposite change in actual temperature reaches the hysteresis temperature, the heat pump water heater will restart. The hysteresis temperature is the difference between the set target temperature and the restart temperature. Both the target temperature and the hysteresis temperature are preset known values. For example, the target temperature can be set to 15℃, 20℃, 25℃, 30℃, etc., and the hysteresis temperature can be set to 2℃, 3℃, 5℃, etc. This allows for more accurate determination of whether the start-up conditions are met, facilitating precise control of the heat pump water heater.

[0090] S200: If the start-up conditions of the set start-up mode are met, the four-way directional valve 320 is switched to the corresponding connected state according to the set start-up mode, and the first control valve 371, the second control valve 372, and the third control valve 373 are adjusted to the preset opening degree. Thus, after determining that start-up can proceed according to the set start-up mode, by controlling the four-way directional valve 320 to switch to the corresponding connected state and adjusting the first control valve 371, the second control valve 372, and the third control valve 373 to the preset opening degree, the refrigerant circulation loop can be connected according to the requirements of the set start-up mode, and the refrigerant in the refrigerant circulation loop can flow along the set path. It can be understood that the preset opening degree can be 0%, 10%, 30%, 50%, 80%, 100%, etc.

[0091] Figure 3 This is a flowchart illustrating another start-up control method for a heat pump water heater provided in an embodiment of this application. For example... Figure 3 As shown, if the start-up conditions of the set start-up mode are not met, the heat pump water heater can remain in standby mode and re-execute step S100. After the start-up conditions of the set start-up mode are met, step S200 is executed again.

[0092] Figure 4 This is a flowchart illustrating the startup mode of a heat pump water heater startup control method provided in this application embodiment when the startup mode is hot water production and heating mode. Figure 4 As shown, in some possible implementations, when the startup mode is hot water production and heating mode, step S100 specifically includes:

[0093] S111: Determine whether the hot water production start-up conditions of the hot water production and heating modes are met based on the actual hot water temperature and the target hot water temperature set in the hot water production and heating modes.

[0094] S112: Determine whether the heating start-up conditions of the hot water production and heating modes are met based on the actual ambient temperature and the heating target temperature set in the hot water production and heating modes.

[0095] In this way, by judging whether the hot water production start-up conditions and the heating start-up conditions of both hot water and heating modes are met, it can be determined whether the heat pump water heater should be started in a combined hot water and heating mode, or in a priority hot water mode when only the hot water production start-up conditions of each mode are met, or in a priority heating mode when only the heating start-up conditions of each mode are met. This ensures that the heat pump water heater can start smoothly and improves its stability and reliability when starting in various different modes.

[0096] In some examples, step S111 may specifically include:

[0097] S1111: If the actual hot water temperature is less than or equal to the difference between the target hot water temperature and the hot water hysteresis temperature set in the hot water production and heating modes, then the hot water production start-up conditions of the hot water production and heating modes are met.

[0098] It is understandable that the hot water hysteresis temperature set in both hot water and heating modes can be the difference between the target hot water temperature set in these modes and the temperature at which the heat pump water heater restarts hot water production after being stopped or in standby mode. Both the target hot water temperature and the hysteresis temperature set in these modes are preset, known values. The actual hot water temperature can be measured using the first temperature sensor 210 and the second temperature sensor 220. Determining whether the hot water production start-up conditions for these modes are met by using the actual hot water temperature, the target hot water temperature, and the hysteresis temperature set in these modes allows for more accurate judgment and facilitates precise temperature control of the hot water tank during hot water and heating modes.

[0099] In some examples, step S112 may specifically include:

[0100] S1121: If the actual ambient temperature is less than or equal to the difference between the heating target temperature and the heating hysteresis temperature set in the hot water and heating modes, then the heating start-up conditions of the hot water and heating modes are met.

[0101] It is understandable that the heating hysteresis temperature set in both hot water and heating modes can be the difference between the target heating temperature set in these modes and the temperature at which the heat pump water heater restarts heating after being stopped or in standby mode. Both the target heating temperature and the hysteresis temperature set in these modes are preset, known values. The actual ambient temperature can be measured using the third temperature sensor 510 and the fourth temperature sensor 520. Determining whether the heating start-up conditions for hot water and heating modes are met by using the actual ambient temperature, the target heating temperature, and the hysteresis temperature set in these modes allows for more accurate judgment and facilitates precise control of the indoor temperature during hot water and heating operation.

[0102] If both the hot water production and heating start-up conditions are met simultaneously, S200 specifically includes:

[0103] S211: Switch the four-way reversing valve 320 to a state in which the output end of the compressor 310 is connected to the first heat exchanger 330 and the input end of the compressor 310 is connected to the third heat exchanger 350, and adjust the first control valve 371, the second control valve 372 and the third control valve 373 to the preset opening degree corresponding to the common start-up state of hot water production and heating modes.

[0104] S212: After adjusting the first control valve 371, the second control valve 372 and the third control valve 373 to the preset opening degree corresponding to the common start-up state of hot water production and heating mode and maintaining it for a first preset time, adjust the first control valve 371, the second control valve 372 and the third control valve 373 to the preset opening degree corresponding to the common operation state of hot water production and heating mode.

[0105] In this way, the refrigerant circulation loop can be connected according to the simultaneous start-up state of hot water production and heating modes, and the refrigerant in the refrigerant circulation loop can flow along a set path. While ensuring the refrigerant circulation loop is connected, the pressure drop generated by the second control valve 372 and the third control valve 373 can be controlled to distribute the refrigerant between the first heat exchanger 330 and the second heat exchanger 340, achieving the purpose of distributing heat for heating and hot water production in the heat pump water heater. After adjusting the first control valve 371, the second control valve 372, and the third control valve 373 to the preset opening degree corresponding to the simultaneous start-up state of hot water production and heating modes and maintaining this position for a first preset time, adjusting the first control valve 371, the second control valve 372, and the third control valve 373 to the preset opening degree corresponding to the simultaneous operation state of hot water production and heating provides a transition phase during the start-up process of the heat pump water heater, improving the stability and reliability of the heat pump water heater during the simultaneous start-up state of hot water production and heating modes.

[0106] Understandably, during hot water and heating modes, the fourth control valve 374 can be adjusted to a throttling state to control throttling and superheat. The first preset time may include, but is not limited to, 5 minutes.

[0107] To achieve the distribution of refrigerant and heat in the heat pump water heater when it is running in both hot water production and heating mode after startup, the refrigerant and heat of the heat pump water heater can be distributed as needed by controlling the opening of the first control valve 371, the second control valve 372 and the third control valve 373 again.

[0108] In some possible implementations, S211 specifically includes:

[0109] S2111: Adjust the first control valve 371, the second control valve 372, and the third control valve 373 to their maximum opening. This simplifies the control of the first control valve 371, the second control valve 372, and the third control valve 373, and further improves the reliability of startup.

[0110] The heat exchange performance of the second heat exchanger 340 and the first heat exchanger 330 is affected by factors such as the frequency of the compressor 310, the outdoor temperature at the third heat exchanger 350, and the difference between the target heating temperature set in the hot water and heating modes and the actual ambient temperature. In some other possible embodiments, S211 specifically includes:

[0111] S2112: Adjust the first control valve 371 to its maximum opening, and adjust the second control valve 372 to a preset opening corresponding to the common start-up state of the hot water and heating modes according to at least one of the following: the frequency of the compressor 310, the outdoor temperature at the third heat exchanger 350, the difference between the target heating temperature set in the hot water and heating modes and the actual ambient temperature; and adjust the third control valve 373 to a preset opening corresponding to the common start-up state of the hot water and heating modes according to at least one of the following: the frequency of the compressor 310, the outdoor temperature at the third heat exchanger 350, the difference between the target hot water temperature set in the hot water and heating modes and the actual hot water temperature.

[0112] In this way, the second control valve 372 can be fitted based on at least one of the following: the frequency of the compressor 310, the outdoor temperature at the third heat exchanger 350, and the difference between the target heating temperature set in the hot water and heating modes and the actual ambient temperature. Similarly, the third control valve 373 can be fitted based on at least one of the following: the frequency of the compressor 310, the outdoor temperature at the third heat exchanger 350, and the difference between the target hot water temperature set in the hot water and heating modes and the actual hot water temperature. This allows for a more rational distribution of refrigerant flowing into the first heat exchanger 330 and the second heat exchanger 340, enabling the heat pump water heater to quickly meet the refrigerant distribution requirements for both hot water and heating operation after startup, thus satisfying the user's needs for indoor temperature and hot water. It is understood that steps S2112 and S2111 can be substituted for each other.

[0113] In some possible implementations, the preset opening degree of the second control valve 372 corresponding to the simultaneous start-up state of hot water production and heating modes, the frequency of the compressor 310, the outdoor temperature at the third heat exchanger 350, and the difference between the heating target temperature set in the hot water production and heating modes and the actual ambient temperature satisfy the following relationship:

[0114] V1 = a1 × f + b1 × T 环 +c1(T0-T1)+d1

[0115] Wherein, V1 is the preset opening degree of the second control valve 372 corresponding to the simultaneous start-up state of hot water and heating modes, f is the frequency of the compressor 310, and T... 环 T0 is the outdoor temperature, T1 is the target heating temperature set in the hot water and heating modes, a1, b1, c1 and d1 are the corresponding adjustment coefficients.

[0116] It is understandable that by setting the adjustment coefficients a1, b1, c1, and d1, the refrigerant in the refrigerant circulation system can be rationally distributed, so that after the heat pump water heater is started, it can quickly meet the refrigerant distribution requirements under the simultaneous operation of hot water production and heating, thereby satisfying the user's needs for indoor temperature and hot water.

[0117] The outdoor temperature at the third heat exchanger 350 can be obtained by installing a fifth temperature sensor at the third heat exchanger 350. This application does not further limit the specific values ​​of the adjustment coefficients a1, b1, c1, and d1.

[0118] In some possible implementations, the preset opening degree of the third control valve 373 corresponding to the simultaneous start-up state of hot water production and heating modes, the frequency of the compressor 310, the outdoor temperature at the third heat exchanger 350, and the difference between the target hot water temperature set in the hot water production and heating modes and the actual hot water temperature satisfy the following relationship:

[0119] V² = a² × f + b² × T 环 +c2(t0-t1)+d2

[0120] Where V2 is the preset opening degree of the third control valve 373 corresponding to the simultaneous start-up state of hot water and heating modes, f is the frequency of compressor 310, and T is the frequency of compressor 310. 环 t0 is the outdoor temperature, t1 is the target hot water temperature set in the hot water production and heating modes, a2, b2, c2 and d2 are the corresponding adjustment coefficients.

[0121] It is understandable that by setting the adjustment coefficients a2, b2, c2, and d2, the refrigerant in the refrigerant circulation system can be rationally distributed, enabling the heat pump water heater to quickly meet the refrigerant distribution requirements for both hot water production and heating after startup, thus satisfying the user's needs for indoor temperature and hot water. This application does not further limit the specific values ​​of the adjustment coefficients a2, b2, c2, and d2.

[0122] It is understandable that when the conditions for starting hot water production and heating are met simultaneously, the fifth control valve 375 can be adjusted to the closed state to reduce the impact of the economizer 360 and the fifth control valve 375 on hot water production and heating.

[0123] In some possible implementations, if only one of the hot water start-up conditions and the heating start-up conditions of the hot water and heating modes are met, S200 specifically includes:

[0124] S213: Switch the four-way reversing valve 320 to a state in which the output end of the compressor 310 is connected to the first heat exchanger 330 and the input end of the compressor 310 is connected to the third heat exchanger 350.

[0125] S214: Adjust the first control valve 371 and the third control valve 373 to their maximum opening according to the priority hot water production state of the hot water production and heating modes when the hot water production start-up conditions of the hot water production and heating modes are met individually; or, adjust the first control valve 371 and the second control valve 372 to their maximum opening according to the priority heating state of the hot water production and heating modes when the heating start-up conditions of the hot water production and heating modes are met individually.

[0126] In this way, when one of the hot water production start-up conditions or the heating start-up condition is met individually, the heat pump water heater can start according to the corresponding state to achieve the function of hot water production or heating, which helps to improve the stability and reliability of the heat pump water heater when starting in multiple different modes.

[0127] Understandably, the hot water start-up conditions for both hot water and heating modes can be determined by the difference between the actual hot water temperature and the target hot water temperature set in the hot water and heating modes and the hot water hysteresis temperature set in the hot water and heating modes. Similarly, the heating start-up conditions can be determined by the difference between the actual ambient temperature and the target heating temperature set in the hot water and heating modes and the heating hysteresis temperature set in the hot water and heating modes.

[0128] In some possible implementations, after another of the hot water start-up conditions and heating start-up conditions for the hot water and heating modes is met, step S200 further includes:

[0129] S215: Shut down the heat pump water heater until it reaches a steady state.

[0130] After the heat pump water heater stops and reaches a steady state, steps S111 and S112 are executed again.

[0131] If the conditions for starting hot water production and heating are met simultaneously, then steps S211 and S212 are executed.

[0132] In other words, once one of the hot water start-up conditions or the heating start-up conditions for both hot water and heating modes is met, the heat pump water heater can be shut down to a steady state and restarted according to the steps taken when the start-up mode is hot water or heating mode.

[0133] During the startup process of a heat pump water heater in either the priority hot water production mode or the priority heating mode, it's possible that one of the hot water production startup conditions or the heating startup condition for either mode will be met. In this case, after the other startup condition is met, the system can restart in both hot water and heating modes simultaneously to meet both hot water and heating needs, simplifying control. It's understood that re-executing step S211 or S212 can determine whether the previously unmet startup condition for either hot water production or heating mode is still met.

[0134] Figure 5 This is a flowchart illustrating the startup mode of another heat pump water heater startup control method provided in this application embodiment when the startup mode is hot water production and heating mode. For example... Figure 5 As shown, in some other possible implementations, after one of the hot water start-up conditions and the heating start-up conditions of the hot water production and heating modes is met, S200 further includes:

[0135] S216: Adjust one of the second control valve 372 and the third control valve 373 that is not adjusted to the maximum opening to the maximum opening.

[0136] S217: After the first control valve 371, the second control valve 372, and the third control valve 373 are all adjusted to their maximum opening and maintained for a second preset time, the frequency of the compressor 310 is adjusted to the preset frequency corresponding to the simultaneous start-up state of the hot water and heating modes, and the opening of the fourth control valve 374 and the fifth control valve 375 is adjusted according to the frequency of the compressor 310. For example, the second preset time may include, but is not limited to, 30 seconds.

[0137] S218: After the compressor 310 maintains a preset frequency corresponding to the simultaneous start-up state of hot water production and heating modes for a third preset time, adjust the first control valve 371, the second control valve 372, and the third control valve 373 to the preset opening degree corresponding to the simultaneous operation state of hot water production and heating. For example, the third preset time may include, but is not limited to, 5 minutes.

[0138] In this way, once the conditions for starting both hot water and heating modes are met, the refrigerant distribution requirements for simultaneous hot water and heating operation can be achieved relatively quickly, thus satisfying the user's needs for indoor temperature and hot water. It is understood that steps S216, S217, and S218 can be substituted for step S215.

[0139] Figure 6This is a flowchart illustrating the startup mode of a heat pump water heater startup control method provided in this application embodiment when the startup mode is hot water production mode. For example... Figure 6 As shown, in some possible implementations, when the startup mode is hot water production mode, S100 specifically includes:

[0140] S120: Determine whether the start-up conditions for the hot water production mode are met based on the actual ambient temperature and the target hot water temperature set in the hot water production mode.

[0141] In some examples, step S120 may specifically include:

[0142] S121: If the actual hot water temperature is less than or equal to the difference between the target hot water temperature and the hysteresis temperature set in the hot water production mode, then the hot water production start-up conditions for the hot water production mode are met. It can be understood that the hysteresis temperature set in the hot water production mode can be the difference between the target hot water temperature set in the hot water production mode and the temperature at which the heat pump water heater restarts hot water production after being stopped or in standby mode. Both the target hot water temperature and the hysteresis temperature set in the hot water production mode are preset known values. This allows for more accurate judgment results and facilitates precise temperature control of the hot water tank during hot water production mode.

[0143] If the activation conditions for the hot water production mode are met, S200 specifically includes:

[0144] S221: Switch the four-way reversing valve 320 to a state where the output end of the compressor 310 is connected to the first heat exchanger 330 and the input end of the compressor 310 is connected to the third heat exchanger 350. Adjust the third control valve 373 to its maximum opening and the second control valve 372 to a small opening. It can be understood that the small opening state allows a small amount of refrigerant to pass through, which can be 5% to 10%. In this way, the refrigerant circulation loop can be connected according to the hot water production mode, and the refrigerant in the circulation loop can flow along a set path. Adjusting the second control valve 372 to a small opening position allows refrigerant to flow on both sides of the second control valve 372. When the first control valve 371 is open, a small portion of the refrigerant flows into the first heat exchanger 330, which can improve the heat utilization efficiency. When the first control valve 371 is closed, the refrigerant between the second control valve 372 and the first control valve 371 can flow with pressure changes, so that at least a portion of the refrigerant between the second control valve 372 and the first control valve 371 can circulate.

[0145] In some possible implementations, if the start-up conditions for the hot water production mode are met, S200 further includes:

[0146] S222: Compare the outdoor temperature at the third heat exchanger 350 with the upper limit of the outdoor ambient temperature in the heating mode.

[0147] S223: If the outdoor temperature is less than or equal to the upper limit of the outdoor ambient temperature for the heating mode, the first control valve 371 will be adjusted to its maximum opening. This allows for a quicker adjustment to a heating-ready state after startup. It is understood that when the outdoor temperature is greater than the upper limit of the outdoor ambient temperature for the heating mode, the user has no heating need; when the outdoor temperature is less than or equal to the upper limit of the outdoor ambient temperature for the heating mode, the user may have a heating need.

[0148] In some possible implementations, if the start-up conditions S200 for the hot water production mode are met, the following further applies:

[0149] S224: If the outdoor temperature exceeds the upper limit of the outdoor ambient temperature for heating mode, the first control valve 371 is switched to the closed state. This reduces the amount of refrigerant flowing into the first heat exchanger 330, minimizing heat waste in the refrigerant, and reducing the risk of further heating the indoor environment when the indoor temperature is high. It is understood that steps S222, S223, and S224 can be executed before step S221. In hot water mode, the fourth control valve 374 can be adjusted to a throttling state, serving to control throttling and superheat.

[0150] Figure 7 This is a flowchart illustrating the startup mode of a heat pump water heater startup control method provided in this application embodiment when the startup mode is heating mode. Figure 7 As shown, in some possible implementations, when the startup mode is heating mode, S100 specifically includes:

[0151] S130: Determine whether the start-up conditions of the heating mode are met based on the actual ambient temperature and the heating target temperature set in the heating mode.

[0152] In some examples, step S130 may specifically include:

[0153] S131: If the actual ambient temperature is less than or equal to the difference between the target heating temperature and the hysteresis temperature set in the heating mode, then the heating start-up conditions for the heating mode are met. It can be understood that the hysteresis temperature set in the heating mode is the difference between the target heating temperature set in the heating mode and the temperature at which the heat pump water heater restarts after being stopped or in standby mode. Both the target heating temperature and the hysteresis temperature set in the heating mode are preset known values. This allows for more accurate judgment results, facilitating precise control of the indoor temperature during heating mode.

[0154] If the conditions for starting the heating mode are met, S200 specifically includes:

[0155] S230: Switch the four-way reversing valve 320 to a state where the output end of the compressor 310 is connected to the first heat exchanger 330, and the input end of the compressor 310 is connected to the third heat exchanger 350. Adjust the first control valve 371 and the second control valve 372 to their maximum opening, and adjust the third control valve 373 to its minimum opening. This allows the refrigerant circulation loop to be connected according to the heating mode, and the refrigerant in the circulation loop to flow along a set path. Adjusting the third control valve 373 to its minimum opening allows the refrigerant to flow on both sides of the third control valve 373. A small portion of the refrigerant flowing into the second heat exchanger 340 can provide heat to the hot water in the hot water tank 200, thus improving heat utilization efficiency. It is understood that in heating mode, the fourth control valve 374 can be adjusted to a throttling state to achieve throttling and superheat control.

[0156] Figure 8 This is a flowchart illustrating the startup mode of a heat pump water heater startup control method provided in this application embodiment when the startup mode is cooling mode. Figure 8 As shown, in some possible implementations, when the startup mode is cooling mode, S100 specifically includes:

[0157] S140: Determine whether the start-up conditions of the cooling mode are met based on the actual ambient temperature and the target cooling temperature set in the cooling mode.

[0158] In some examples, step S140 may specifically include:

[0159] S141: If the actual ambient temperature is greater than or equal to the sum of the target cooling temperature and the hysteresis temperature set in the cooling mode, then the heating start-up conditions for the cooling mode are met. It can be understood that the hysteresis temperature set in the cooling mode is the difference between the temperature at which the heat pump water heater restarts cooling after stopping or idling, as set in the cooling mode, and the target cooling temperature. Both the target cooling temperature and the hysteresis temperature set in the cooling mode are preset known values. This allows for more accurate judgment results and facilitates precise control of the indoor temperature during cooling mode.

[0160] If the activation conditions for cooling mode are met, S200 specifically includes:

[0161] S240: Switch the four-way reversing valve 320 to a state where the input end of the compressor 310 is connected to the first heat exchanger 330 and the output end of the compressor 310 is connected to the third heat exchanger 350. Adjust the first control valve 371 to its maximum opening, the second control valve 372 to a throttling state, and the third control valve 373 to a small opening state. This allows the refrigerant circulation loop to be connected according to the cooling mode, and the refrigerant in the circulation loop to flow along a set path. Adjusting the third control valve 373 to a small opening state allows the refrigerant to flow on both sides of the third control valve 373. A small portion of the refrigerant flowing into the second heat exchanger 340 can provide heat to the hot water in the hot water tank 200, thus improving heat utilization efficiency. It is understood that in cooling mode, the fourth control valve 374 can be adjusted to its maximum opening.

[0162] It should be noted that before switching the four-way directional valve 320 to the corresponding connected state according to the set start-up mode, and adjusting the first control valve 371, the second control valve 372, and the third control valve 373 to the preset opening degree, the process includes the following step: resetting the first control valve 371, the second control valve 372, and the third control valve 373 to a ready-to-start state. This facilitates precise opening degree control of the first control valve 371, the second control valve 372, and the third control valve 373 according to the set start-up mode.

[0163] When a heat pump water heater includes a fourth control valve 374 and a fifth control valve 375, before switching the four-way reversing valve 320 to the corresponding connected state according to the set start-up mode, and adjusting the first control valve 371, the second control valve 372, and the third control valve 373 to the preset opening degree, the system also includes resetting the fourth control valve 374 and the fifth control valve 375, indicating that the fourth control valve 374 and the fifth control valve 375 are in a ready-to-start state. This facilitates precise opening degree control of the fourth control valve 374 and the fifth control valve 375 according to the set start-up mode. The ready-to-start state can be a fully open state, a fully closed state, or a state opened to a certain degree. The ready-to-start states of the first control valve 371, the second control valve 372, the third control valve 373, the fourth control valve 374, and the fifth control valve 375 can be the same, partially the same, or all different.

[0164] After resetting the first control valve 371, the second control valve 372, and the third control valve 373, the process further includes determining the starting sequence of the circulation pump, fan 400, and compressor 310 in the heat pump water heater. It should be noted that the rotation of the fan 400 at startup can be determined based on the heat pump water heater's startup mode and the outdoor temperature where the third heat exchanger 350 is located. When the heat pump water heater starts in cooling or heating mode, the compressor 310 can be started after the circulation pump is turned on. Specifically, the starting sequence of the circulation pump, compressor 310, and fan 400 can be referenced in related descriptions of heat pump water heaters in the relevant art; in this embodiment, no further limitations are made.

[0165] This application also provides a heat pump water heater, which employs the start-up control method of any of the above embodiments. It should be noted that the specific process of the start-up control method for the heat pump water heater has been described in detail above and will not be repeated here. Furthermore, since the heat pump water heater adopts all the technical solutions in the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be elaborated upon here.

[0166] This application embodiment also provides a storage medium storing computer execution instructions. When executed by a processor, these instructions are used to implement the start-up control method for a heat pump water heater as described in any of the above embodiments. The processor can be electrically connected to a controller, allowing it to act as the execution entity for the heat pump water heater start-up control method, controlling various components in the refrigerant circulation loop through the controller.

[0167] The storage medium can be a computer storage medium, such as a computer-readable storage medium, or a communication medium. A communication medium includes any medium that facilitates the transfer of a computer program from one location to another. A computer storage medium can be any available medium accessible to a general-purpose or special-purpose computer. For example, a computer-readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the computer-readable storage medium. Of course, the computer-readable storage medium can also be a component of the processor. The processor and the computer-readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the ASIC can be located in a user equipment. Of course, the processor and the computer-readable storage medium can also exist as discrete components in a communication device. Specifically, the computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random-Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage medium can be any available medium accessible to general-purpose or special-purpose computers.

[0168] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A start-up control method for a heat pump water heater, characterized in that, The heat pump water heater includes a refrigerant circulation loop and a hot water tank; The refrigerant circulation loop includes a compressor, a four-way reversing valve, a first heat exchanger, a second heat exchanger, and a third heat exchanger. One end of the first heat exchanger is connected to one end of the compressor via a first control valve and the four-way reversing valve. The other end of the first heat exchanger is connected to one end of the third heat exchanger via a second control valve. The other end of the third heat exchanger is connected to the other end of the compressor via the four-way reversing valve. One end of the second heat exchanger is connected between the output end of the compressor and the four-way reversing valve. The other end of the second heat exchanger is connected between the second control valve and the third heat exchanger via a third control valve. The first heat exchanger is used to exchange heat between the refrigerant inside and the indoor environment. The second heat exchanger is used to exchange heat between the refrigerant inside and the hot water tank. The third heat exchanger is used to exchange heat between the refrigerant inside and the outdoor environment. The startup control method includes: Based on the preset target temperature and the corresponding actual temperature in the set start-up mode, determine whether the start-up conditions of the set start-up mode are met. The start-up mode is one of hot water production mode, cooling mode, heating mode, or hot water production and heating mode. The actual temperature includes at least one of the actual hot water temperature in the hot water tank and the actual ambient temperature corresponding to the indoor environment. If the start-up conditions of the set start-up mode are met, the four-way reversing valve is switched to the corresponding connected state according to the set start-up mode, and the first control valve, the second control valve and the third control valve are adjusted to the preset opening degree. When the startup mode is the hot water production and heating mode, based on the preset target temperature in the set startup mode and the corresponding actual temperature, it is determined whether the startup conditions of the set startup mode are met, specifically including: Determine whether the hot water production start-up conditions of the hot water production and heating mode are met based on the actual hot water temperature and the target hot water temperature set in the hot water production and heating mode. Determine whether the heating start-up conditions of the hot water production and heating mode are met based on the actual ambient temperature and the heating target temperature set in the hot water production and heating mode. If the hot water production start-up conditions and heating start-up conditions of the hot water production and heating modes are met simultaneously, the four-way reversing valve is switched to the corresponding connected state according to the set start-up mode, and the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree, specifically including: Switch the four-way reversing valve to a state in which the output end of the compressor is connected to the first heat exchanger and the input end of the compressor is connected to the third heat exchanger, and adjust the first control valve, the second control valve and the third control valve to a preset opening degree corresponding to the common start state of the hot water production and heating modes; After adjusting the first control valve, the second control valve, and the third control valve to the preset opening degree corresponding to the common start-up state of the hot water production and heating modes and maintaining it for a first preset time, the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree corresponding to the common operation state of hot water production and heating modes.

2. The start-up control method according to claim 1, characterized in that, Adjusting the first control valve, the second control valve, and the third control valve to a preset opening degree corresponding to the simultaneous start-up state of the hot water production and heating modes specifically includes: Adjust the first control valve, the second control valve, and the third control valve to their maximum opening. Alternatively, the first control valve is adjusted to its maximum opening, and the second control valve is adjusted to a preset opening corresponding to the common start-up state of the hot water and heating modes based on at least one of the compressor frequency, the outdoor temperature at the third heat exchanger, the difference between the target heating temperature set in the hot water and heating modes and the actual ambient temperature. The third control valve is also adjusted to a preset opening corresponding to the common start-up state of the hot water and heating modes based on at least one of the compressor frequency, the outdoor temperature at the third heat exchanger, the difference between the target hot water temperature set in the hot water and heating modes and the actual hot water temperature.

3. The start-up control method according to claim 2, characterized in that, The preset opening degree of the second control valve, the frequency of the compressor, the outdoor temperature at the third heat exchanger, and the difference between the target heating temperature set in the hot water production and heating modes and the actual ambient temperature, corresponding to the simultaneous start-up state of the hot water production and heating modes, satisfy the following relationship: in, The preset opening degree of the second control valve corresponding to the simultaneous start-up state of the hot water production and heating modes. The frequency of the compressor, The outdoor temperature is... The target heating temperature set in the hot water production and heating mode. The actual ambient temperature. , , and This refers to the corresponding adjustment coefficient; And / or, the preset opening degree of the third control valve, the frequency of the compressor, the outdoor temperature at the third heat exchanger, and the difference between the target hot water temperature set in the hot water production and heating modes and the actual hot water temperature, corresponding to the simultaneous start-up state of the hot water production and heating modes, satisfy the following relationship: in, The preset opening degree of the third control valve corresponding to the simultaneous start-up state of the hot water production and heating modes. The frequency of the compressor, The outdoor temperature is... The target temperature for hot water production is set in the aforementioned hot water production and heating modes. The actual hot water temperature is... , , and This is the corresponding adjustment coefficient.

4. The start-up control method according to any one of claims 1-3, characterized in that, If either the hot water start-up condition or the heating start-up condition of the hot water and heating modes is met, the four-way reversing valve is switched to the corresponding connected state according to the set start-up mode, and the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree, specifically including: Switch the four-way reversing valve to a state in which the output end of the compressor is connected to the first heat exchanger and the input end of the compressor is connected to the third heat exchanger; The first control valve and the third control valve are adjusted to their maximum opening according to the priority hot water production state of the hot water production and heating mode when the hot water production start-up conditions of the hot water production and heating mode are met individually, or the first control valve and the second control valve are adjusted to their maximum opening according to the priority heating state of the hot water production and heating mode when the heating start-up conditions of the hot water production and heating mode are met individually. After one of the hot water production start-up conditions and the heating start-up conditions of the hot water production and heating modes is met, adjusting the first control valve, the second control valve, and the third control valve to the preset opening degree further includes: The heat pump water heater was shut down until it reached a steady state. After the heat pump water heater stops and reaches a steady state, it re-determines whether the hot water production start-up conditions of the hot water production and heating mode are met based on the actual hot water temperature and the target hot water temperature set in the hot water production and heating mode, and determines whether the heating start-up conditions of the hot water production and heating mode are met based on the actual ambient temperature and the target heating temperature set in the hot water production and heating mode. If both the hot water production start-up conditions and the heating start-up conditions of the aforementioned hot water production and heating modes are met simultaneously, then: Switch the four-way reversing valve to a state in which the output end of the compressor is connected to the first heat exchanger and the input end of the compressor is connected to the third heat exchanger, and adjust the first control valve, the second control valve and the third control valve to a preset opening degree corresponding to the common start state of the hot water production and heating modes; After adjusting the first control valve, the second control valve, and the third control valve to the preset opening degree corresponding to the common start-up state of the hot water production and heating modes and maintaining it for a first preset time, the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree corresponding to the common operation state of hot water production and heating modes.

5. The start-up control method according to any one of claims 1-3, characterized in that, When the startup mode is hot water production mode, the startup conditions of the preset startup mode are determined based on the actual temperature and the preset target temperature in the startup mode, specifically including: Determine whether the start-up conditions of the hot water production mode are met based on the actual ambient temperature and the target hot water temperature set in the hot water production mode. If the activation conditions for the hot water production mode are met, the four-way reversing valve is switched to the corresponding connected state according to the set activation mode, and the first control valve, the second control valve, and the third control valve are adjusted to the preset opening degree, specifically including: Switch the four-way reversing valve to a state where the output end of the compressor is connected to the first heat exchanger and the input end of the compressor is connected to the third heat exchanger, and adjust the third control valve to the maximum opening degree and the second control valve to the small opening degree.

6. The start-up control method according to claim 5, characterized in that, If the activation conditions for the hot water production mode are met, adjusting the first control valve, the second control valve, and the third control valve to a preset opening degree further includes: Compare the outdoor temperature at the third heat exchanger with the upper limit of the outdoor ambient temperature for the heating mode; If the outdoor temperature is less than or equal to the upper limit of the outdoor ambient temperature of the heating mode, the first control valve is adjusted to the maximum opening degree. If the outdoor temperature is greater than the upper limit of the outdoor ambient temperature for the heating mode, the first control valve is switched to the closed state.

7. The start-up control method according to any one of claims 1-3, characterized in that, When the start-up mode is heating mode or cooling mode, the start-up conditions of the set start-up mode are determined based on the actual temperature and the preset target temperature in the set start-up mode, specifically including: Determine whether the starting conditions of the heating mode are met based on the actual ambient temperature and the heating target temperature set in the heating mode; or determine whether the starting conditions of the cooling mode are met based on the actual ambient temperature and the cooling target temperature set in the cooling mode. If the starting conditions of the heating mode are met, the four-way reversing valve is switched to the corresponding connected state according to the set starting mode, and the first control valve, the second control valve and the third control valve are adjusted to the preset opening degree. Specifically, the four-way reversing valve is switched to a state in which the output end of the compressor is connected to the first heat exchanger and the input end of the compressor is connected to the third heat exchanger, and the first control valve and the second control valve are adjusted to the maximum opening degree, and the third control valve is adjusted to the small opening degree opening state. And / or, if the start-up conditions of the cooling mode are met, the four-way reversing valve is switched to the corresponding connected state according to the set start-up mode, and the first control valve, the second control valve, and the third control valve are adjusted to a preset opening degree. Specifically, this includes: switching the four-way reversing valve to a state in which the input end of the compressor is connected to the first heat exchanger and the output end of the compressor is connected to the third heat exchanger, and adjusting the first control valve to the maximum opening degree, adjusting the second control valve to the throttling state, and adjusting the third control valve to the small opening degree.

8. A heat pump water heater, characterized in that, The start-up control method for a heat pump water heater as described in any one of claims 1-7 is adopted.

9. A storage medium, characterized in that, The storage medium stores computer execution instructions, which, when executed by a processor, are used to implement the start-up control method for a heat pump water heater as described in any one of claims 1-7.

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