Heat pump water heater and heating method thereof

Abstract

The invention belongs to the technical field of water heaters, and particularly relates to a heat pump water heater and a heating method thereof. The heating method of the heat-pump water heater comprises the steps that the exhaust temperature of a compressor is obtained; comparing the exhaust temperature with a first preset temperature; and if the exhaust temperature is higher than the first preset temperature, the first switch valve is opened, so that the first circulating pipeline communicates with the compressor and the water tank for heat exchange. Therefore, when the exhaust temperature of the compressor is too high, heat exchange is conducted between the compressor and the water tank by opening the first switch valve, cooling of the compressor is achieved, heating of water in the water tank is achieved, the heating efficiency of the heat pump water heater is guaranteed, and heat loss is reduced.

Description

Technical Field

[0001] This invention belongs to the field of water heater technology, specifically relating to a heat pump water heater and its heating method. Background Technology

[0002] A heat pump water heater is a type of hot water device widely used in various residential and commercial settings. A heat pump water heater typically includes a compressor, a heat exchanger, and a water tank. The compressor compresses the refrigerant into a high-temperature, high-pressure gas, which then exchanges heat with the water in the tank within the heat exchanger, thus heating the water in the tank.

[0003] To ensure the performance and lifespan of the compressor, the compressor's discharge temperature cannot be too high. Therefore, in related technologies, reducing the compressor frequency is usually used to control the compressor's discharge temperature.

[0004] However, reducing the compressor frequency will lead to a decrease in the compressor's operating efficiency, thereby reducing the heating efficiency of the heat pump water heater. Summary of the Invention

[0005] This invention provides a heat pump water heater and its heating method to solve the problem of reduced heating efficiency of the heat pump water heater when the exhaust temperature of the compressor is lowered.

[0006] In a first aspect, the present invention provides a heating method for a heat pump water heater, comprising: obtaining the exhaust temperature of a compressor; comparing the exhaust temperature with a first preset temperature; and if the exhaust temperature is greater than the first preset temperature, opening a first switching valve to connect a first circulation pipeline to the compressor and a water tank for heat exchange.

[0007] In the preferred embodiment of the heating method for the heat pump water heater described above, after opening the first switch valve if the exhaust temperature is greater than the first preset temperature, the method further includes comparing the exhaust temperature with a second preset temperature, wherein the second preset temperature is less than the first preset temperature; if the exhaust temperature is greater than the second preset temperature, the first switch valve remains open; if the exhaust temperature is less than or equal to the second preset temperature, the first switch valve is closed.

[0008] In the preferred embodiment of the heating method for the heat pump water heater described above, the method further includes: if the exhaust temperature is less than or equal to the first preset temperature, increasing the frequency of the compressor; if the exhaust temperature is greater than the first preset temperature, decreasing the frequency of the compressor.

[0009] In the preferred embodiment of the heating method for the heat pump water heater described above, the method further includes obtaining the current evaporation temperature of the evaporator; comparing the current evaporation temperature with a third preset temperature; and if the current evaporation temperature is less than the third preset temperature, opening the second switching valve to connect the second circulation pipeline to the evaporator and the water tank for heat exchange.

[0010] In the preferred embodiment of the heating method for the heat pump water heater described above, before obtaining the exhaust temperature of the compressor, the method further includes obtaining the current ambient temperature; comparing the current ambient temperature with a fourth preset temperature; if the current ambient temperature is less than the fourth preset temperature, then opening the first switching valve, starting the compressor after a preset time, and closing the first switching valve; if the current ambient temperature is greater than or equal to the fourth preset temperature, then directly starting the compressor.

[0011] Secondly, the present invention provides a pipeline system including a compressor; a water tank; a first circulation pipeline passing through the water tank and surrounding the compressor; a first switching valve disposed on the first circulation pipeline; and a temperature sensor disposed on the compressor.

[0012] In the preferred technical solution of the above-mentioned pipeline system, a heat exchanger is also included. The heat exchanger is connected to the compressor through a first connecting pipe and to the water tank through a second connecting pipe.

[0013] In the preferred embodiment of the above-mentioned pipeline system, an evaporator is further included, which is connected to the compressor via a third connecting pipeline; a second circulation pipeline, which passes through the water tank and is wound around the surface of the evaporator; and a second switching valve is disposed on the second circulation pipeline, which is configured to control the connection and closing of the second circulation pipeline.

[0014] Thirdly, the present invention provides a heat pump water heater, comprising a piping system as described in any of the second aspects and an acquisition module for acquiring the exhaust temperature of the compressor; a comparison module for comparing the exhaust temperature with a first preset temperature; and a control module for opening a first switching valve when the exhaust temperature is greater than the first preset temperature, so that a first circulation pipeline connects the compressor and the water tank for heat exchange.

[0015] In the preferred embodiment of the above-mentioned heat pump water heater, a processor and a memory are further included. The processor is used to run code to execute the heating method of the heat pump water heater according to any one of the first aspects, and the memory is used to store the code for the processor to execute the heating method of the heat pump water heater.

[0016] Those skilled in the art will understand that the heat pump water heater and its heating method provided by the present invention involve obtaining the exhaust temperature of the compressor; comparing the exhaust temperature with a first preset temperature; and if the exhaust temperature is greater than the first preset temperature, opening a first switching valve to connect the first circulation pipeline to the compressor and the water tank for heat exchange. Thus, when the compressor exhaust temperature is too high, opening the first switching valve allows heat exchange between the compressor and the water tank, achieving both compressor cooling and water tank heating, thereby ensuring the heating efficiency of the heat pump water heater and reducing heat loss. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] Figure 1 The flow chart of the heating method for a heat pump water heater provided by the present invention Figure 1 ;

[0019] Figure 2 The flow chart of the heating method for a heat pump water heater provided by the present invention Figure 2 ;

[0020] Figure 3 The flow chart of the heating method for a heat pump water heater provided by the present invention Figure 3 ;

[0021] Figure 4 The flow chart of the heating method for a heat pump water heater provided by the present invention Figure 4 ;

[0022] Figure 5 This is a schematic diagram of the pipeline system provided by the present invention;

[0023] Figure 6 A schematic diagram of the hardware structure of the heat pump water heater provided by the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 10-Memory;

[0026] 20-Processor;

[0027] 30-bus;

[0028] 100 - Compressor;

[0029] 200-water tank;

[0030] 300 - Evaporator;

[0031] 400 - First circulation pipeline;

[0032] 500 - First switching valve;

[0033] 600 - Second circulation pipeline;

[0034] 700 - Second switching valve;

[0035] 800-Heat Exchanger. Detailed Implementation

[0036] 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 applications. For example, although the water tray of the present invention is described in conjunction with an air conditioner, this is not limiting; other devices with condensate water receiving requirements can also be configured with the water tray of the present invention.

[0037] Secondly, it should be noted that in the description of this invention, terms such as "inner" and "outer" indicate directions or positional relationships based on the directions 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 this invention.

[0038] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] The preferred technical solution of the heat pump water heater and its heating method of the present invention is described below.

[0040] A heat pump water heater is a type of hot water device widely used in various residential and commercial settings. A heat pump water heater typically includes a compressor, a heat exchanger, and a water tank. The compressor compresses the refrigerant into a high-temperature, high-pressure gas, which then exchanges heat with the water in the tank within the heat exchanger, thus heating the water in the tank.

[0041] To ensure the performance and lifespan of the compressor, the compressor's discharge temperature cannot be too high. Therefore, in related technologies, reducing the compressor frequency is usually used to control the compressor's discharge temperature.

[0042] However, reducing the compressor frequency will lead to a decrease in the compressor's operating efficiency, thereby reducing the heating efficiency of the heat pump water heater.

[0043] Reference Figure 1 and Figure 5 Firstly, in order to solve the above problems, this embodiment provides a heating method for a heat pump water heater, comprising:

[0044] S101, obtain the discharge temperature of compressor 100.

[0045] Specifically, the heat pump water heater draws in and compresses the refrigerant through the compressor 100, thereby increasing the temperature and pressure of the refrigerant. The high-temperature and high-pressure refrigerant then enters the heat exchanger 800 to exchange heat with the water in the water tank 200, thus heating the water in the water tank 200.

[0046] However, when the temperature of the refrigerant inside the compressor 100 is too high, it can cause the lubricating oil to carbonize, reducing its lubrication performance and accelerating wear on the compressor 100. It may also damage the sealing performance of the compressor 100, thus affecting its operating efficiency and consequently the overall operating efficiency of the heat pump water heater. Therefore, to ensure the normal operation of the compressor 100 and extend its service life, it is necessary to obtain the discharge temperature of the compressor 100 in real time to ensure the normal operation of the heat pump water heater.

[0047] The exhaust temperature of the compressor 100 can be obtained by setting a temperature sensor at the exhaust port of the compressor 100, or by other means. This embodiment does not impose any restrictions on this.

[0048] S102, compare the exhaust temperature with the first preset temperature.

[0049] Specifically, after obtaining the real-time exhaust temperature, it is necessary to compare the exhaust temperature with the first preset temperature to determine whether the exhaust temperature is within a safe or normal operating range.

[0050] The first preset temperature is the maximum discharge temperature of the compressor 100 during normal operation. If the discharge temperature exceeds the first preset temperature, it means that the compressor 100 is under a large load. The specific value of the first preset temperature can be set according to factors such as the design specifications of the compressor 100 and the requirements of the working environment. This embodiment does not impose any restrictions on this.

[0051] In one exemplary embodiment, the first preset temperature is 105°C.

[0052] S103, if the exhaust temperature is greater than the first preset temperature, the first switch valve 500 is opened so that the first circulation pipeline 400 is connected to the compressor 100 and the water tank 200 for heat exchange.

[0053] Specifically, when the exhaust temperature is higher than the first preset temperature, it means that the exhaust temperature has exceeded the safe or normal operating range. Therefore, it is necessary to reduce the exhaust temperature to avoid damage to the compressor 100.

[0054] In this embodiment, by opening the first switching valve 500, the first circulation pipe 400 is connected to the compressor 100 and the water tank 200, thereby transferring the heat of the compressor 100 to the water tank 200 through the first circulation pipe 400. This achieves both cooling of the compressor 100 and heating of the water in the water tank 200, thus ensuring the heating efficiency of the heat pump water heater.

[0055] Specifically, the first circulation pipe 400 is filled with a working medium, which circulates within the first circulation pipe 400. When the working medium flows to the compressor 100, it can absorb the heat of the compressor 100. When the working medium flows from the compressor 100 to the water tank 200, it can transfer the heat to the water in the water tank 200, thereby cooling the compressor 100 and heating the water in the water tank 200.

[0056] It should also be noted that if the exhaust temperature is less than or equal to the first preset temperature, the first switching valve 500 will remain closed.

[0057] Specifically, when the exhaust temperature is less than or equal to the first preset temperature, it means that the exhaust temperature has not yet exceeded the safe or normal operating range. Therefore, there is no need to intervene in the exhaust temperature of the compressor 100.

[0058] Meanwhile, in order to ensure that the exhaust temperature of the compressor 100 is always within a safe or normal operating range, the exhaust temperature of the compressor 100 can be repeatedly acquired or the exhaust temperature of the compressor 100 can be repeatedly acquired after a set time interval, and the exhaust temperature can be compared with the first preset temperature.

[0059] In one exemplary embodiment, the exhaust temperature of compressor 100 is checked again every ten minutes, i.e., steps S102 and S103 are repeated.

[0060] In the above embodiment, when the exhaust temperature is higher than the first preset temperature, the first switching valve 500 is opened, so that the first circulation pipeline 400 transfers the heat of the compressor 100 to the water in the water tank 200. This ensures that the exhaust temperature of the compressor 100 can be cooled through the first circulation pipeline 400 when it is too high. At the same time, the compressor 100 is cooled down and the water in the water tank 200 is heated up, thereby ensuring the heating efficiency of the heat pump water heater and reducing heat loss.

[0061] Reference Figure 2 and Figure 5In an optional implementation, if the exhaust temperature is greater than the first preset temperature in step S103, after opening the first switching valve, the heating method of the heat pump water heater further includes:

[0062] S201, compare the exhaust temperature with the second preset temperature, the second preset temperature is less than the first preset temperature.

[0063] Specifically, when the exhaust temperature is greater than the first preset temperature, the first switching valve 500 is opened to cool the compressor 100. Then, by comparing the exhaust temperature with the second preset temperature, it is determined whether the first switching valve 500 needs to be kept open.

[0064] The second preset temperature is the minimum exhaust temperature of the compressor 100 under normal operating conditions to meet the heating requirements of the heat pump water heater. The specific value of the second preset temperature can be set according to the design specifications of the compressor 100 and the requirements of the working environment, etc. This embodiment does not impose any restrictions on it.

[0065] In this embodiment, the second preset temperature is 95°C.

[0066] S202, if the exhaust temperature is greater than the second preset temperature, then the first switching valve 500 remains open.

[0067] Specifically, when the exhaust temperature is greater than the second preset temperature, it means that the compressor 100 is not yet in a safe or normal operating range. Therefore, it is necessary to keep the first switching valve 500 open to continue cooling the compressor 100.

[0068] S203, if the exhaust temperature is less than or equal to the second preset temperature, then close the first switch valve 500.

[0069] Specifically, when the exhaust temperature is less than or equal to the second preset temperature, it means that the compressor 100 is already in a safe or normal operating range. At this time, there is no need to continue cooling the compressor 100. The first switch valve 500 is closed to prevent the temperature of the compressor 100 from being too low and affecting the heating efficiency of the heat pump water heater.

[0070] In the above embodiment, by comparing the exhaust temperature with the second preset temperature, it is determined whether the compressor 100 is within a safe or normal operating range after being cooled by the first circulation pipeline 400. This is to avoid the compressor 100's exhaust temperature from continuing to cool down after it has dropped to a safe or normal temperature, thus affecting the heating efficiency of the heat pump water heater. It also avoids the compressor 100 from stopping cooling down before its exhaust temperature has dropped to a safe or normal temperature, which would affect the overall performance of the compressor 100 and cause damage to the compressor 100.

[0071] In one optional implementation, the heating method of the heat pump water heater further includes:

[0072] S301, if the exhaust temperature is lower than the second preset temperature, increase the frequency of the compressor 100.

[0073] Specifically, when the current exhaust temperature is lower than the second preset temperature, it means that the current compressor 100 is already in a safe or normal operating range, and at the same time, it is a certain distance away from the limit exhaust temperature when the compressor 100 is in normal operating condition. Therefore, by increasing the frequency of the compressor 100, the heating frequency of the heat pump water heater can be guaranteed within a safe range.

[0074] S301, if the exhaust temperature is less than or equal to the first preset temperature, increase the frequency of compressor 100.

[0075] Specifically, when the current exhaust temperature is less than or equal to the first preset temperature, it means that the current compressor 100 is in a safe or normal operating range. Therefore, by increasing the frequency of the compressor 100, the heating frequency of the heat pump water heater can be guaranteed within a safe range.

[0076] It should be noted that, in this embodiment, before step S301, when the exhaust temperature is less than or equal to the second preset temperature, while closing the first switch valve 500, the frequency of the compressor 100 can be appropriately increased to ensure the heating efficiency of the heat pump water heater.

[0077] Specifically, when the exhaust temperature is less than or equal to the second preset temperature, it means that the compressor 100 is currently in a safe or normal operating range, and is at a certain distance from the limit exhaust temperature when the compressor 100 is in normal operating condition. Therefore, by increasing the frequency of the compressor 100, the heating frequency of the heat pump water heater can be guaranteed within a safe range.

[0078] After the compressor 100 frequency is increased for a set time, the exhaust temperature is compared with the first preset temperature to confirm whether the compressor 100 is still in a normal and safe operating state after the frequency is increased. If the exhaust temperature is less than or equal to the first preset temperature, it means that the compressor 100 is still in a safe or normal operating range. Therefore, by increasing the frequency of the compressor 100 again, the heating frequency of the heat pump water heater can be guaranteed within a safe range.

[0079] At the same time, it should be noted that after increasing the frequency of compressor 100, the exhaust temperature can be obtained again, and the exhaust temperature can be compared with the first preset temperature to ensure that compressor 100 can always operate in a safe and normal state.

[0080] S302, if the exhaust temperature is higher than the first preset temperature, reduce the compressor frequency by 100.

[0081] Specifically, if the exhaust temperature is greater than the first preset temperature, it means that the compressor 100 is in an abnormal working state. Therefore, by reducing the frequency of the compressor 100, the exhaust temperature of the compressor 100 can be reduced to avoid damage to the compressor 100.

[0082] Meanwhile, it should be noted that in this embodiment, after reducing the frequency of the compressor 100, the exhaust temperature of the compressor 100 can be repeatedly acquired or acquired at set intervals, that is, steps S301 and S302 can be repeatedly executed to ensure that the frequency and exhaust temperature of the compressor 100 are always monitored, ensuring that the compressor 100 can operate effectively for a long time and ensuring the working efficiency of the heat pump water heater.

[0083] The time setting can be selectively set according to actual needs, and this implementation method does not impose any restrictions on it.

[0084] In the above embodiments, by increasing the frequency of the compressor 100 when the exhaust temperature of the compressor 100 is less than or equal to the first preset temperature, the heating efficiency of the heat pump water heater can be improved while ensuring the normal operation of the compressor 100. By reducing the operating frequency of the compressor 100 when the exhaust temperature is greater than the first preset temperature, the problem of compressor 100 being damaged due to excessively high exhaust temperature can be avoided.

[0085] refer to Figure 3 and Figure 5 In one optional embodiment, the heating method of the heat pump water heater further includes:

[0086] S401, obtain the current evaporation temperature of evaporator 300.

[0087] Specifically, the evaporator 300 is used to convert liquid refrigerant into gaseous state by absorbing low-temperature heat from the environment and causing it to evaporate, so that the compressor 100 can compress the gaseous refrigerant.

[0088] However, in winter, due to the significant drop in ambient temperature, the water vapor content in the air is relatively high. As a result, the water vapor in the air is prone to condense on the surface of the evaporator 300 and gradually form a frost layer, thereby reducing the heat exchange efficiency of the evaporator 300 and affecting the overall performance of the heat pump water heater.

[0089] Therefore, to ensure the evaporation efficiency of evaporator 300, it is necessary to obtain the current evaporation temperature of evaporator 300 in real time to ensure the normal operation of the heat pump water heater. Since frosting mainly occurs in winter, the current evaporation temperature of evaporator 300 can be obtained only during winter.

[0090] The current evaporation temperature of the evaporator 300 can be obtained by setting a temperature sensor on the evaporator 300, or by other means. This embodiment does not impose any restrictions on this.

[0091] S402, compare the current evaporation temperature with the third preset temperature.

[0092] Specifically, after obtaining the current evaporation temperature of the evaporator 300, comparing the current evaporation temperature with the third preset temperature can determine whether the current evaporation temperature is below the safe or normal operating range, thereby ensuring that the evaporator 300 can operate stably.

[0093] The third preset temperature is the minimum evaporation temperature of the evaporator 300 under normal operating conditions.

[0094] The specific value of the third preset temperature can be set according to the design specifications of the evaporator 300 and the requirements of the working environment, etc. This embodiment does not impose any restrictions on it.

[0095] In one exemplary embodiment, the third preset temperature is -20°C.

[0096] S403, if the current evaporation temperature is lower than the third preset temperature, the second switch valve 700 is opened so that the second circulation pipeline 600 is connected to the evaporator 300 and the water tank 200 for heat exchange.

[0097] Specifically, if the current evaporation temperature is lower than the third preset temperature, it means that the current operating temperature of the evaporator 300 is low and it is prone to frosting. Therefore, by opening the second switch valve 700, the second circulation pipe 600 can be connected to the evaporator 300 and the water tank 200, thereby realizing heat exchange between the evaporator 300 and the water tank 200 to increase the current evaporation temperature of the evaporator 300.

[0098] Specifically, since the water tank 200 typically has an insulation function, the water in the water tank 200 will not freeze even in winter. The evaporator 300 and the water tank 200 are connected through a second circulation pipe 600, which is filled with a working medium that circulates within the pipe. When the working medium flows to the water tank 200, it absorbs heat from the water in the tank. When the working medium flows from the water tank 200 to the evaporator 300, it transfers heat to the water in the tank, thus raising the temperature of the evaporator 300 and preventing frost formation.

[0099] It should also be noted that in this embodiment, if the current evaporation temperature is greater than or equal to the third preset temperature, the second switching valve 700 remains closed.

[0100] In the above embodiments, if the current evaporation temperature is greater than or equal to the third preset temperature, it means that the current operating temperature of the evaporator 300 is within a safe or normal operating range, and therefore, there is no need to intervene in the evaporator 300.

[0101] To ensure that the evaporator 300 is always in a safe and normal working state, the current evaporation temperature of the evaporator 300 can be repeatedly detected, or the current evaporation temperature of the evaporator 300 can be detected at set intervals, that is, steps S401 to S403 can be repeated.

[0102] The time setting can be selectively set according to actual needs, and this implementation method does not impose any restrictions on it.

[0103] In the above embodiment, by acquiring and comparing the current evaporation temperature with the third preset temperature, it is confirmed whether the evaporator 300 is in a safe or normal operating range and whether it is prone to frosting. When the evaporation temperature is lower than the third preset temperature, the second switch valve 700 is opened to allow the water in the water tank 200 to exchange heat with the evaporator 300, thereby increasing the temperature of the evaporator 300, avoiding the occurrence of frosting, and thus ensuring the operating efficiency of the heat pump water heater.

[0104] Furthermore, it should be noted that since heat pump water heaters typically have a defrosting system, this embodiment improves defrosting efficiency by opening the second switch valve 700 to assist the defrosting system in defrosting the evaporator 300. When exiting the defrosting state, the second switch valve 700 can be closed accordingly to avoid wasting heat.

[0105] refer to Figure 4 and Figure 5 In an optional implementation, before obtaining the compressor's exhaust temperature in step S101, the heating method of the heat pump water heater further includes:

[0106] S501, obtain the current ambient temperature.

[0107] Specifically, in winter, due to the low ambient temperature, the compressor 100 needs to extract heat from the low-temperature environment, resulting in a higher load on the compressor 100 during startup. Therefore, the compressor 100 needs to preheat before starting operation.

[0108] S502, compare the current ambient temperature with the fourth preset temperature.

[0109] To ensure the normal operation of the compressor 100, the current ambient temperature can be obtained and compared with the fourth preset temperature to confirm whether the current ambient temperature is the temperature at which the compressor 100 can operate normally.

[0110] The current ambient temperature can be obtained by setting a temperature sensor. Alternatively, other methods can be used to obtain the current ambient temperature; this implementation does not impose any restrictions on this method.

[0111] The fourth preset temperature is the lowest ambient temperature at which the compressor 100 can operate normally. The specific value of the fourth preset temperature can be set according to factors such as the design specifications of the compressor 100 and the requirements of the working environment. This embodiment does not impose any restrictions on this.

[0112] In this embodiment, the fourth preset temperature is -15°.

[0113] S503, if the current ambient temperature is lower than the fourth preset temperature, the first switching valve 500 is opened, the compressor 100 is started after a preset time, and the first switching valve 500 is closed.

[0114] Specifically, if the current ambient temperature is lower than the fourth preset temperature, it means that the compressor 100 is under a heavy load during startup, which is not conducive to its normal startup. Simultaneously, when the compressor 100 starts at excessively low temperatures, the fluidity of the lubricating oil inside the compressor 100 deteriorates, and the refrigerant evaporation rate slows down. This leads to the accumulation of lubricating oil and refrigerant inside the compressor, resulting in oil and liquid return. Therefore, by opening the first switching valve 500, the first circulation pipe 400 transfers heat from the water in the water tank 200 to the compressor 100. This ensures that the compressor 100 can be heated through the first circulation pipe 400 even at low ambient temperatures, improving the compressor 100's startup efficiency and thus increasing the heating efficiency of the heat pump water heater, while preventing the oil and liquid return problem in the compressor 100.

[0115] The preset time can be selectively adjusted according to actual needs. In this embodiment, the preset time is 10 minutes.

[0116] It should be noted that, since the water tank 200 typically has a heat preservation function, the water in the water tank 200 will not freeze even in winter. Therefore, the heat from the water in the water tank 200 is sufficient to preheat the compressor 100, ensuring its normal operation.

[0117] S504, if the current ambient temperature is greater than or equal to the fourth preset temperature, the compressor 100 will be started directly.

[0118] Specifically, if the current ambient temperature is greater than or equal to the fourth preset temperature, it means that the compressor 100 can start and run normally. Therefore, there is no need to open the first switch valve 500, and the compressor 100 can be started directly.

[0119] In the above embodiment, by acquiring the current ambient temperature and comparing it with the fourth preset temperature, it is confirmed whether the compressor 100 is within a safe or normal operating range under the current ambient temperature. If the current ambient temperature is lower than the fourth preset temperature, it means that the current ambient temperature is too low and the compressor 100 is difficult to start normally. By opening the first switch valve 500, heat exchange occurs between the water in the water tank 200 and the compressor 100 to preheat the compressor 100, thus ensuring the normal start-up and operation of the compressor 100.

[0120] refer to Figure 1 and Figure 5 Secondly, this embodiment provides a pipeline system including a compressor 100; a water tank 200; a first circulation pipeline 400, which passes through the water tank 200 and is wound around the compressor 100; a first switching valve 500, which is disposed on the first circulation pipeline 400; and a temperature sensor, which is disposed on the compressor 100.

[0121] In the above embodiment, the first circulation pipe 400 passes through the water tank 200 and is wound around the compressor 100. It is a closed pipe with both ends connected to each other. The first circulation pipe 400 is filled with a working medium, so that it can absorb the heat of the compressor 100 through the working medium and transfer it to the water in the water tank 200, or absorb the heat of the water in the water tank 200 and transfer it to the compressor 100.

[0122] Specifically, a through hole is provided on the water tank 200, and the first circulation pipe 400 passes through the through hole on the water tank 200. To ensure the airtightness of the water tank 200, a sealing element is provided around the through hole to ensure the sealing and heat preservation performance of the water tank 200.

[0123] The first switching valve 500 is installed on the first circulation pipeline 400. The temperature sensor can detect the exhaust temperature of the compressor 100 in real time, so that the first switching valve 500 can be opened or closed adaptively according to the temperature of the compressor 100 detected by the temperature sensor, and the flow of the working medium in the first circulation pipeline 400 can be controlled.

[0124] In one specific implementation, the first switching valve 500 is a solenoid valve.

[0125] Meanwhile, the first circulation pipe 400 is designed to transfer the heat of the water in the water tank 200 to the compressor 100 during winter. This ensures that the compressor 100 can be heated up when the ambient temperature is low, thereby improving the starting efficiency of the compressor 100 and thus improving the heating efficiency of the heat pump water heater. At the same time, it avoids the problem of oil and liquid return from the compressor 100.

[0126] Furthermore, it should be noted that in this embodiment, the first circulation pipe 400 is a heat pipe. A heat pipe is a heat conduction element that transfers heat through the phase change process of the working medium (usually water, ammonia, or methanol, etc.) inside the heat pipe, resulting in high heat transfer efficiency.

[0127] In other embodiments, the first circulation conduit 400 may also be other components capable of heat transfer, and this embodiment does not impose any restrictions on this.

[0128] In one alternative embodiment, the piping system further includes a heat exchanger 800, which is connected to the compressor 100 via a first connecting pipe and to the water tank 200 via a second connecting pipe.

[0129] In the above embodiment, the piping system also includes a heat exchanger 800, which is connected to the exhaust port of the compressor 100 through a first connecting pipe and to the water tank 200 through a second connecting pipe. This allows the heat energy in the refrigerant under high temperature and high pressure discharged by the compressor 100 to be transferred to the water in the water tank 200 to heat the water in the water tank 200, thereby realizing the transfer and utilization of heat energy.

[0130] In one alternative embodiment, the piping system further includes an evaporator 300, which is connected to the compressor 100 via a third connecting pipe; a second circulation pipe 600, which passes through the water tank 200 and is wound around the surface of the evaporator 300; and a second switching valve 700, which is disposed on the second circulation pipe 600 and configured to control the opening and closing of the second circulation pipe 600.

[0131] In the above embodiment, the second circulation pipe 600 passes through the water tank 200 and is wound around the surface of the evaporator 300. It is a closed pipe with its two ends connected to each other. The second circulation pipe 600 is filled with a working medium. During the flow of the working medium, heat exchange can be realized between the water in the water tank 200 and the evaporator 300.

[0132] In this embodiment, the second circulation pipe 600 is a heat pipe, which is a heat conduction element that transfers heat through the phase change process of the working medium (usually water, ammonia, or methanol, etc.) inside the heat pipe, resulting in high heat transfer efficiency.

[0133] In other embodiments, the second circulation conduit 600 may also be other components capable of heat transfer, and this embodiment does not impose any limitations on this.

[0134] Specifically, in winter, due to the significant drop in ambient temperature, the water vapor content in the air is relatively high. As a result, the water vapor in the air is prone to condense on the surface of the evaporator 300 and gradually form a frost layer, thereby reducing the heat exchange efficiency of the evaporator 300 and affecting the overall performance of the heat pump water heater.

[0135] Since the water tank 200 typically has insulation properties, the water in the water tank 200 will not freeze even in winter. The evaporator 300 and water tank 200 are connected via a second circulation pipe 600. When the working medium flows to the water tank 200, it absorbs heat from the water in the water tank 200. When the working medium flows from the water tank 200 to the evaporator 300, it transfers heat to the water in the water tank 200, thus raising the temperature of the evaporator 300 and preventing frost formation.

[0136] Thirdly, this embodiment provides a heat pump water heater, which includes the piping system described in any of the second aspects, and

[0137] The module is used to acquire the exhaust temperature of the compressor 100; the comparison module is used to compare the exhaust temperature with a first preset temperature; and the control module is used to open the first switch valve 500 when the exhaust temperature is greater than the first preset temperature, so that the first circulation pipeline 400 connects the compressor 100 and the water tank 200 for heat exchange.

[0138] Specifically, the heat pump water heater draws in and compresses the refrigerant through the compressor 100, thereby increasing the temperature and pressure of the refrigerant. The high-temperature and high-pressure refrigerant then enters the heat exchanger 800 to exchange heat with the water in the water tank 200, thus heating the water in the water tank 200.

[0139] However, when the temperature of the refrigerant inside the compressor 100 is too high, it can cause the lubricating oil to carbonize, reducing its lubrication performance and accelerating wear on the compressor 100. It may also damage the sealing performance of the compressor 100, thus affecting its operating efficiency and consequently the overall operating efficiency of the heat pump water heater. Therefore, to ensure the normal operation of the compressor 100 and extend its service life, it is necessary to obtain the discharge temperature of the compressor 100 in real time to ensure the normal operation of the heat pump water heater.

[0140] Therefore, by acquiring the exhaust temperature of the compressor 100 through the acquisition module and comparing the exhaust temperature with the first preset temperature through the comparison module, it is possible to determine whether the exhaust temperature is within a safe or normal operating range.

[0141] When the exhaust temperature is greater than the first preset temperature, it means that the exhaust temperature has exceeded the safe or normal operating range. Therefore, the exhaust temperature needs to be reduced to avoid damage to the compressor 100. When the exhaust temperature is less than or equal to the first preset temperature, it means that the exhaust temperature has not yet exceeded the safe or normal operating range. Therefore, there is no need to intervene in the exhaust temperature of the compressor 100.

[0142] If the exhaust temperature is higher than the first preset temperature, the control module opens the first switch valve 500 so that the first circulation pipe 400 connects the compressor 100 and the water tank 200 for heat exchange. The heat of the compressor 100 is transferred to the water tank 200 through the first circulation pipe 400. While cooling the compressor 100, the water in the water tank 200 is heated, thus ensuring the heating efficiency of the heat pump water heater.

[0143] To ensure that the exhaust temperature of the compressor 100 is always within a safe or normal operating range, the acquisition module will repeatedly acquire the exhaust temperature of the compressor 100 after a set time interval, and compare the exhaust temperature with the first preset temperature through the comparison module to ensure the normal operation of the compressor 100.

[0144] If the exhaust temperature is higher than the first preset temperature, the control module keeps the first switching valve 500 closed.

[0145] It should be noted that in this embodiment, the first switching valve 500 is kept closed by default.

[0146] In the above embodiment, the exhaust temperature is obtained by the acquisition module, and when the exhaust temperature is greater than the first preset temperature by the comparison module, the first switching valve 500 is opened by the control module, so that the first circulation pipeline 400 transfers the heat of the compressor 100 to the water in the water tank 200. This ensures that the exhaust temperature of the compressor 100 can be cooled through the first circulation pipeline 400 when it is too high. At the same time, both the cooling of the compressor 100 and the heating of the water in the water tank 200 are achieved, thereby ensuring the heating efficiency of the heat pump water heater and reducing heat loss.

[0147] Reference Figure 1 Figure 5 and Figure 6 In one alternative embodiment, the heat pump water heater further includes a processor 20 and a memory 10, the processor 20 being configured to run code to perform the heating method of the heat pump water heater as described in any of the first aspects, and the memory 10 being configured to store code for the processor 20 to perform the heating method of the heat pump water heater.

[0148] The heating method of the heat pump water heater has been described in the above embodiments and will not be repeated here.

[0149] Specifically, the memory 10 can be a computer memory or an external storage device such as a hard disk or flash memory. The appropriate type of memory 10 can be selected according to actual needs.

[0150] In this embodiment, the memory 10 and the processor 20 are connected via a bus 30 to enable data transmission. The processor 20 executes code by reading the data stored in the memory 10 to implement the heating method of the heat pump water heater.

[0151] This embodiment also provides a storage medium storing heating execution instructions, which, when executed by a heat pump water heater, are used to implement the heating method of the heat pump water heater as described in any of the above embodiments.

[0152] Specifically, the storage medium provided in this embodiment can be connected to the heat pump water heater via a data interface. This embodiment does not impose any restrictions on the specific connection method.

[0153] The data interface can be a physical interface or a wireless connection. For example, the control device can connect to the storage medium via interfaces such as USB, HDMI, and SATA, or via wireless communication protocols such as Bluetooth and WiFi.

[0154] When the storage medium is connected to the heat pump water heater, the heat pump water heater can read and execute the corresponding execution instructions from the storage medium to realize the heating method of the heat pump water heater.

[0155] 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 heating method for a heat pump water heater, characterized in that, include: Obtain the compressor's discharge temperature; Compare the exhaust temperature with the first preset temperature; If the exhaust temperature is greater than the first preset temperature, the first switching valve is opened to connect the first circulation pipeline to the compressor and the water tank for heat exchange.

2. The heating method of the heat pump water heater according to claim 1, characterized in that, If the exhaust temperature is greater than the first preset temperature, then after opening the first switching valve, the method further includes: Comparing the exhaust temperature with the second preset temperature, the second preset temperature is less than the first preset temperature; If the exhaust temperature is greater than the second preset temperature, then the first switching valve remains open; If the exhaust temperature is less than or equal to the second preset temperature, then the first switching valve is closed.

3. The heating method of the heat pump water heater according to claim 1, characterized in that, Also includes: If the exhaust temperature is less than or equal to the first preset temperature, then increase the frequency of the compressor; If the exhaust temperature is greater than the first preset temperature, then the compressor frequency is reduced.

4. The heating method of the heat pump water heater according to any one of claims 1-3, characterized in that, Also includes: Obtain the current evaporation temperature of the evaporator; Compare the current evaporation temperature with the third preset temperature; If the current evaporation temperature is lower than the third preset temperature, the second switch valve is opened to connect the second circulation pipeline to the evaporator and the water tank for heat exchange.

5. The heating method of the heat pump water heater according to any one of claims 1-3, characterized in that, Before obtaining the compressor's exhaust temperature, the process also includes: Get the current ambient temperature; Compare the current ambient temperature with the fourth preset temperature; If the current ambient temperature is lower than the fourth preset temperature, the first switching valve is opened, the compressor is started after a preset time, and the first switching valve is closed. If the current ambient temperature is greater than or equal to the fourth preset temperature, the compressor is started directly.

6. A piping system, characterized in that, include: compressor; Water tank; The first circulation pipeline runs through the water tank and is wound around the compressor; A first switching valve is installed on the first circulation pipeline; A temperature sensor is installed on the compressor.

7. The piping system according to claim 6, characterized in that, It also includes a heat exchanger, which is connected to the compressor via a first connecting pipe and to the water tank via a second connecting pipe.

8. The piping system according to claim 7, characterized in that, Also includes: An evaporator, which is connected to the compressor via a third connecting pipe; The second circulation pipeline passes through the water tank and is wound around the surface of the evaporator. A second switching valve is disposed on the second circulation pipeline, and the second switching valve is configured to control the connection and closure of the second circulation pipeline.

9. A heat pump water heater, characterized in that, Including the piping system as described in any one of claims 6-7, and An acquisition module is used to acquire the exhaust temperature of the compressor; The comparison module is used to compare the exhaust temperature with the first preset temperature. The control module is used to open the first switching valve when the exhaust temperature is greater than the first preset temperature, so that the first circulation pipeline connects the compressor and the water tank for heat exchange.

10. The heat pump water heater according to claim 9, characterized in that, It also includes a processor and a memory, the processor being used to run code to perform the heating method of the heat pump water heater according to any one of claims 1-5, and the memory being used to store the code for the processor to perform the heating method of the heat pump water heater.

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