Water storage tank and heat pump water heater

Abstract

The utility model belongs to the technical field of heat supply, and particularly discloses a water storage tank and a heat pump water heater. The water storage tank comprises an inner container and a double-pipe heat exchanger wound around the outer side of the inner container, the double-pipe heat exchanger comprises an inner pipe and an outer pipe arranged on the outer side of the inner pipe in a sleeving mode at intervals, a water passing channel is formed in an inner cavity of the inner pipe, a refrigerant channel is formed between the inner pipe and the outer pipe, and the water inlet end of the inner pipe is used for being connected with a cold water supply pipeline. The water outlet end of the inner pipe is connected with the inner container water inlet of the inner container, and the outer pipe is in heat conduction contact with the inner container. The heat pump water heater water storage tank, the compressor, the throttling device, the evaporator and the gas-liquid separator are sequentially connected end to end to form a refrigerant circulation pipeline. According to the water storage tank and the heat-pump water heater, the water heating efficiency can be improved, the requirement for the volume of the water storage tank is lowered, and miniaturization of the heat-pump water heater is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, in particular to a water storage tank and a heat pump water heater. Background Art

[0002] Water heaters are essential and common electrical appliances in modern home life. They are usually divided into electric water heaters, gas water heaters and heat pump water heaters according to the heating method.

[0003] The prior art provides a heat pump water heater that includes a water tank and a compressor, heat exchanger, electronic expansion valve, evaporator, and gas-liquid separator, which are arranged in series via a refrigerant pipeline. The heat exchanger is coiled around the outside of the water tank. High-temperature, high-pressure refrigerant compressed and ejected by the compressor flows to the heat exchanger, where it exchanges heat with the water in the water tank, heating the water.

[0004] The heat pump water heater provided by the prior art is a storage type water heater, which requires a large water tank to heat and store hot water, resulting in the heat pump water heater occupying a large space, which is not conducive to the use of heat pump water heaters in small households. At the same time, when the water temperature in the water tank is low, it is difficult to meet the demand for the heat pump water heater to be used immediately. Utility Model Content

[0005] One of the technical problems solved by the present invention is to provide a water storage tank, which can effectively solve the problem of large space occupied by the large water storage tank volume in the existing heat pump water heater, while meeting the heating and water supply needs, reducing the volume of the water storage tank.

[0006] The second technical problem solved by the present invention is to provide a heat pump water heater, which can effectively solve the problem that the existing heat pump water heaters require a large volume of water storage tank, resulting in a large overall footprint of the heat pump water heater, which is not conducive to installation and use in small households. It can reduce the footprint of the heat pump water heater and improve the flexibility of use of the heat pump water heater.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A water storage tank includes an inner tank and a shell and tube heat exchanger arranged around the outside of the inner tank. The shell and tube heat exchanger includes an inner tube and an outer tube arranged at intervals outside the inner tube. The inner cavity of the inner tube forms a water passage, and a refrigerant passage is formed between the inner tube and the outer tube. The water inlet end of the inner tube is used to be connected to a cold water supply pipeline, and the water outlet end of the inner tube is connected to the inner tank water inlet of the inner tank. The outer tube and the inner tank are in heat conduction contact.

[0009] Compared with the background technology, the heat pump water heater described in the present invention has the following beneficial effects: since the shell and tube heat exchanger is coiled and arranged outside the inner tank, and the water outlet end of the water passage of the shell and tube heat exchanger is connected to the water inlet of the inner tank, when there is no water at the water-using end, high-temperature refrigerant can be introduced into the refrigerant passage to realize heat exchange between the high-temperature refrigerant and the water in the inner tank, thereby realizing static heating of the water in the inner tank and meeting the heat storage and heat preservation requirements of the water storage tank; when there is water at the water-using end, the refrigerant can simultaneously exchange heat with the water in the water passage and the water in the inner tank. Heat exchange is carried out to improve the heat exchange efficiency and heat exchange effect, thereby increasing the temperature rise rate of the water flowing into the water tank, so that the water capacity in the inner tank does not need to be large, and the user's large-scale use of hot water can be continuously met, reducing the volume demand of the inner tank, thereby reducing the volume of the entire water tank; furthermore, since the refrigerant channel is located between the inner tube and the outer tube, and the outer tube is in heat conduction contact with the outer wall of the inner tank, it is more conducive to the refrigerant to simultaneously pass through the outer tube to the inside of the inner tank for heat conduction, thereby improving the heating efficiency and heating effect of the water in the water tank.

[0010] In one embodiment, a heat-conducting structure is provided between the outer tube and the inner liner.

[0011] In one embodiment, the heat-conducting structure includes heat-conducting silicone grease filled between the outer tube and the outer wall of the inner container;

[0012] And / or, the heat-conducting structure wraps the outer tube.

[0013] In one embodiment, the water storage tank further comprises an outer shell, the outer shell is sleeved on the outside of the inner tank, and the shell-and-tube heat exchanger is located between the inner tank and the outer shell;

[0014] The shell and tube heat exchanger further includes connecting pipes connected to both ends of the outer tube, the inner cavity of the connecting pipe is communicated with the refrigerant channel, the connecting pipe extends out of the outer shell, and the water inlet end of the inner tube extends out of the outer shell.

[0015] In one embodiment, a heat-insulating structure is filled between the outer shell and the inner liner.

[0016] In one embodiment, the inlet of the refrigerant channel and the outlet of the water channel are located at the first end of the shell and tube heat exchanger, and the outlet of the refrigerant channel and the inlet of the water channel are located at the second end of the shell and tube heat exchanger.

[0017] In one embodiment, the water inlet of the inner liner is arranged at the lower part of the inner liner, the water outlet of the inner liner is arranged at the upper part of the inner liner, the shell and tube heat exchange tube is located between the water inlet of the inner liner and the water outlet of the inner liner, and the lower end of the shell and tube heat exchanger is the first end of the shell and tube heat exchanger.

[0018] In one embodiment, the water tank further includes a temperature detection component, and the temperature detection component is used to detect the water temperature inside the inner tank.

[0019] The second technical problem mentioned above is solved by the following technical solution:

[0020] A heat pump water heater comprises a compressor, a throttling device, an evaporator and a gas-liquid separator, and also comprises the above water storage tank. The compressor, the refrigerant channel, the throttling device, the evaporator and the gas-liquid separator are connected end to end in sequence to form a refrigerant circulation pipeline.

[0021] Compared with the background technology, the heat pump water heater described in the present invention has the following beneficial effects: by adopting the above-mentioned water storage tank, the space occupied by the heat pump water heater is reduced, making the heat pump water heater more suitable for use in small households, and improving the flexibility and versatility of use of the heat pump water heater.

[0022] In one embodiment, the heat pump water heater includes a cold water supply pipe, the cold water supply pipe is connected to the water inlet of the water passage, and a flow switch is provided on the cold water supply pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a heat pump water heater provided in an embodiment of the present utility model;

[0024] Figure 2 A cross-sectional view of a water storage tank provided in an embodiment of the present utility model;

[0025] Figure 3 for Figure 2 A partial enlarged view of point I in the middle;

[0026] Figure 4 A side view of a water storage tank provided in an embodiment of the present utility model;

[0027] Figure 5 A front view of a water storage tank provided by an embodiment of the present utility model;

[0028] Figure 6 for Figure 5 A partial enlarged view of point J in the middle.

[0029] Description of labels:

[0030] 100, water storage tank; 200, compressor; 300, throttling device; 400, evaporator; 500, gas-liquid separator; 600, cooling fan; 700, water supply end; 800, cold water supply pipe; 900, flow switch;

[0031] 1. Inner liner; 11. Inner liner water inlet; 12. Inner liner water outlet; 2. Shell-and-tube heat exchanger; 21. Inner tube; 22. Outer tube; 23. Water passage; 24. Refrigerant passage; 25. Connecting pipe; 3. Water inlet and outlet joints; 4. Outer shell; 5. Thermal insulation structure; 6. Heat conduction structure. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] This embodiment provides a heat pump water heater that can use high-temperature refrigerant and water for heat exchange to achieve water heating, meet the demand for hot water use, and reduce the overall floor space of the heat pump water heater.

[0037] like Figures 1 to 3As shown, in this embodiment, the heat pump water heater includes a compressor 200, a water tank 100, a throttling device 300, an evaporator 400, and a gas-liquid separator 500. The water tank 100 includes an inner tank 1 and a double-tube heat exchanger 2 coiled around the outer side of the inner tank 1. The double-tube heat exchanger 2 includes an inner tube 21 and an outer tube 22 spaced apart and sleeved around the outer side of the inner tank 1. The inner cavity of the inner tube 21 forms a water passage 23, and a refrigerant passage 24 is formed between the inner tube 21 and the outer tube 22. The water inlet end of the inner tube 21 is connected to the cold water supply pipe 800, and the water outlet end of the inner tube 21 is connected to the inner tank water inlet 11 of the inner tank 1. The inner tank water outlet 12 of the inner tank 1 is used to connect to the water end 700. The compressor 200, the refrigerant passage 24, the throttling device 300, the evaporator 400, and the gas-liquid separator 500 are connected end to end in sequence to form a refrigerant circulation pipeline.

[0038] The water storage tank 100 and heat pump water heater provided in this embodiment have a water passage 23 formed in the inner cavity of the double-tube heat exchanger 2, a refrigerant passage 24 formed between the inner tube 21 and the outer tube 22, and the water outlet of the water passage 23 is connected to the water inlet 11 of the inner tank. As a result, the heat pump water heater has two modes: a heating mode and a heat storage mode.

[0039] When there is no water use at the water end 700, that is, the cold water supply pipe 800 does not supply refrigerant to the water passage 23, the water in the inner tank 1 is statically set at this time, and the high-temperature and high-pressure gaseous refrigerant compressed and ejected by the compressor 200 flows into the refrigerant passage 24, and through the contact between the outer wall of the outer tube 22 and the wall of the inner tank 1, the refrigerant heat is transferred from the outer wall of the outer tube 22 and the wall of the inner tank 1 to the water inside the inner tank 1, so that the water in the inner tank 1 is heated and the temperature is increased to achieve preheating and insulation of the water in the water storage tank 100; the refrigerant is cooled by heat exchange to form a high-pressure and low-temperature liquid refrigerant or a gas-liquid two-phase refrigerant and flows to the throttling device 300, and the refrigerant is cooled at the throttling device 300 to form a low-temperature and low-pressure liquid refrigerant, and then after heat dissipation in the evaporator 400, it forms a low-pressure and medium-temperature gaseous refrigerant. The medium-temperature and low-pressure gaseous refrigerant is separated by gas and liquid at the gas-liquid separator 500 and then flows back to the compressor 200. That is, the heat pump water heater is in heat storage mode at this time.

[0040] When water is being used at the water supply end 700, the cold water supply pipe 800 delivers cold water to the water passage 23. At the same time, the compressor 200 starts, and the high-temperature, high-pressure gaseous refrigerant ejected from the compressor 200 flows through the refrigerant circulation pipeline to the refrigerant passage 24. The refrigerant in the refrigerant passage 24 exchanges heat with the water in the water passage 23 through the wall of the inner tube 21, heating the water there. Furthermore, the refrigerant's heat is transferred to the water in the inner tank 1 through the wall of the outer tube 22, heating it. The heated water in the water passage 23 flows into the inner tank 1, mixing with it and being further heated before flowing out of the inner tank 1 and being supplied to the water supply end 700. The refrigerant flowing out of the refrigerant passage 24 passes through the throttling device 300, the evaporator 400, and the gas-liquid separator 500 before returning to the compressor 200. At this point, the heat pump water heater is in heating mode.

[0041] That is, the water storage tank 100 provided in this embodiment has the outer side of the inner tank 1 coiled by the shell and tube heat exchanger 2, and the water outlet end of the water passage 23 of the shell and tube heat exchanger 2 is connected to the water inlet of the inner tank 1. When there is no water at the water end 700, high-temperature refrigerant can be introduced into the refrigerant passage 24 to achieve heat exchange between the high-temperature refrigerant and the water in the inner tank 1, thereby achieving static heating of the water in the inner tank 1 and meeting the heat storage and heat preservation requirements of the water storage tank 100. When there is water at the water end 700, the refrigerant can simultaneously exchange heat with the water in the water passage 23 and the water in the inner tank 1, thereby improving the heat exchange efficiency and heat exchange effect, thereby increasing the temperature rise rate of the water flowing into the water storage tank 100. degree, thereby making it unnecessary for the water capacity in the inner tank 1 to be large, and also being able to continuously meet the user's large-scale use demand for hot water, reducing the volume demand for the inner tank 1, thereby reducing the volume of the entire water storage tank 100, reducing the footprint of the heat pump water heater, making the heat pump water heater more suitable for use in small households, and improving the flexibility and versatility of the use of the heat pump water heater; furthermore, since the refrigerant channel 24 is located between the inner tube 21 and the outer tube 22, and the outer tube 22 is in heat conduction contact with the outer wall of the inner tank 1, it is more conducive to the refrigerant to simultaneously pass through the outer tube 22 to the interior of the inner tank 1 for heat conduction, thereby better meeting the heat exchange efficiency and heat exchange effect of the heat pump water heater in the heat storage mode.

[0042] In order to better control the operation of the heat pump water heater, a flow switch 900 is provided on the cold water supply pipe 800. The heat pump water heater includes a controller, and the flow switch 900 is communicatively connected to the controller so that the controller determines whether water is being used at the water end 700 based on the detection signal of the flow switch 900.

[0043] It is worth noting that the controller can control the compressor 200 to operate at a variable frequency. When the heat pump water heater is in the heating mode, the controller can control the compressor 200 to operate at a relatively high frequency state, thereby improving the heating efficiency and heating effect of the water and achieving rapid heating; when the heat pump water heater is in the heat storage mode, the controller can control the compressor 200 to operate at a relatively low frequency state, thereby meeting the insulation and heat storage while reducing the operating energy consumption of the heat pump water heater.

[0044] To further enhance the control convenience of the heat pump water heater, the water tank 100 also includes a temperature sensor. This sensor is used to detect the water temperature within the inner tank 1. This sensor determines whether the water tank 100 needs to be heated and maintained when no water is being consumed at the water supply end 700. This determines whether the heat pump water heater should remain in standby mode or switch to heat storage mode. Specifically, when the temperature detected by the temperature sensor is lower than a preset heat preservation temperature, the controller switches the heat pump water heater to heat storage mode.

[0045] Furthermore, the heat pump water heater further includes a heat dissipation fan 600 , which is installed at the evaporator 400 for dissipating heat from the evaporator 400 .

[0046] In one embodiment, in order to better ensure the heat exchange effect between the refrigerant in the refrigerant channel 24 and the water in the inner liner 1, a heat-conducting structure 6 is provided between the outer tube 22 and the outer wall of the inner liner 1 to better guide the heat at the outer wall of the outer tube 22 to the wall of the inner liner 1.

[0047] To facilitate the installation of the heat-conducting structure 6, in one embodiment, the heat-conducting structure 6 is a thermally conductive silicone grease filled between the outer tube 22 and the wall of the inner liner 1. This is low-cost, easy to install, and has a relatively simple structure. In other embodiments, the heat-conducting structure 6 can also be a heat-conducting film, etc., installed between the outer tube 22 and the outer wall of the inner liner 1.

[0048] Furthermore, the heat-conducting structure 6 wraps around the outer tube 22, further facilitating the conduction of heat from the outer tube 22 to the wall of the inner liner 1, thereby improving the heat conduction effect and reducing heat loss from the outer tube 22. Specifically, the double-tube heat exchanger 2 is spirally wound around the outer side of the inner liner 1, and thermal grease is filled between two adjacent spiral tube segments to ensure that the thermal grease fills the gaps between the tube segments of the double-tube heat exchanger 2 and the gap between the double-tube heat exchanger 2 and the inner liner 1.

[0049] In order to better ensure the water insulation effect of the water tank 100, the water tank 100 also includes an outer shell 4, which is arranged on the outside of the inner tank 1 at intervals, and the shell and tube heat exchanger 2 is located between the outer shell 4 and the inner tank 1. By providing the outer shell 4, the shell and tube heat exchanger 2 can be shielded and protected, and the overall aesthetics of the water tank 100 can be improved.

[0050] The double-tube heat exchanger 2 also includes connecting tubes 25 connected to both ends of the outer tube 22. The inner cavity of the connecting tube 25 communicates with the refrigerant passage 24. The connecting tube 25 extends out of the outer shell 4, and the water inlet end of the inner tube 21 extends out of the outer shell 4. This facilitates the connection of the double-tube heat exchanger 2 to the refrigerant circulation pipeline by extending the connecting tube 25 out of the outer shell 4, improving the ease of assembly and disassembly of the water storage tank 100. By extending the water inlet end of the inner tube 21 out of the outer shell 4, the inner tube 21 is easily connected to the cold water supply pipe 800.

[0051] In one embodiment, the water outlet end of the inner tube 21 is connected to the water outlet 12 of the inner tank via a connecting pipe, which is located inside the outer shell 4 to reduce the exposure of the pipeline at the water tank 100, thereby facilitating the transportation and use of the water tank 100.

[0052] In one embodiment, a heat-insulating material is filled between the outer shell 4 and the inner liner 1. Thus, the heat transfer to the outside is reduced through the heat-insulating material, thereby improving the heat-insulating effect of the water in the inner liner 1.

[0053] To improve the ease of installation of the insulation structure 5, the insulation structure 5 is a foam layer that is filled between the outer shell 4 and the inner tank 1. This configuration is low-cost and facilitates the processing and molding of the water tank 100. Furthermore, the provision of the foam layer can better wrap the double-tube heat exchanger 2 and the thermal conductive structure 6, ensuring the stability and reliability of the overall structure of the water tank 100. In other embodiments, the insulation structure 5 can be thermal insulation cotton or other existing structures that can achieve thermal insulation.

[0054] like Figures 4 to 6 As shown, since cold water is heavier than hot water, the upper layer of water in the water tank 100 is hot water and the lower layer of water is hot water. In order to ensure that the water flowing out of the inner tank 1 is hot water, the inner tank water inlet 11 is set at the lower part of the inner tank 1, and the inner tank water outlet 12 is set at the upper part of the inner tank 1, so that the upper layer of hot water in the inner tank 1 flows out through the inner tank water outlet 12, and the cold water flows in through the inner tank water inlet 11 at the bottom, reducing the disturbance of the water in the inner tank 1 caused by the cold water inlet.

[0055] The shell and tube heat exchanger 2 is arranged at the inner tank water inlet 11 and the inner tank water outlet 12 to ensure that the inner tank water inlet 11 is located at the bottom of the inner tank 1, and the shell and tube heat exchanger 2 can heat the middle area of the inner tank 1 to ensure the heating effect of the water in the water tank 100.

[0056] In one embodiment, in order to further improve the heat exchange effect between the refrigerant in the refrigerant channel 24 and the water in the water channel 23, the refrigerant inlet of the refrigerant channel 24 and the water outlet of the water channel 23 are located at the first end of the shell and tube heat exchanger 2, and the refrigerant outlet of the refrigerant channel 24 and the water inlet of the water channel 23 are located at the second end of the shell setting, that is, in the shell and tube heat exchanger 2, the flow direction of the refrigerant in the refrigerant channel 24 is opposite to the flow direction of the cold water in the water channel 23, thereby better ensuring the full absorption of the refrigerant heat and improving the efficiency of the heat exchanger.

[0057] Furthermore, the upper end of the shell and tube heat exchanger 2 is the first end of the shell and tube heat exchanger 2. This arrangement allows the refrigerant to flow from top to bottom in the refrigerant channel 24, while the water in the inner liner 1 flows from bottom to top. The flow direction of the refrigerant in the refrigerant channel 24 is opposite to the flow direction of the water in the inner liner 1 in the height direction of the inner liner 1, which is beneficial to enhancing the heat exchange effect between the heat exchange refrigerant and the water in the inner liner 1, and increasing the amount of heat absorbed by water in the refrigerant.

[0058] In one embodiment, the inner tank 1 is provided with water inlet and outlet connectors 3 at the inner tank water inlet 11 and the inner tank water outlet 12 to facilitate connection between the inner tank 1 and the double-tube heat exchanger 2 and the water supply end 700. The water inlet and outlet connectors 3 at the inner tank water outlet 12 extend outside the outer shell 4 and are connected to the water supply end 700 via a hot water supply pipe. The hot water supply pipe and the water inlet and outlet connectors 3 are detachably connected to ensure the overall assembly and disassembly of the water storage tank 100.

[0059] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The specific contents of the above-mentioned specific embodiments only express several embodiments of the present invention. Although the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. A water storage tank, characterized in that: The invention comprises an inner liner (1) and a shell and tube heat exchanger (2) arranged around the outer side of the inner liner (1), wherein the shell and tube heat exchanger (2) comprises an inner tube (21) and an outer tube (22) arranged at intervals on the outer side of the inner tube (21), the inner cavity of the inner tube (21) forms a water passage (23), a refrigerant passage (24) is formed between the inner tube (21) and the outer tube (22), the water inlet end of the inner tube (21) is used to be connected to a cold water supply pipe (800), the water outlet end of the inner tube (21) is connected to the inner liner water inlet (11) of the inner liner (1), and the outer tube (22) and the inner liner (1) are in heat conduction contact.

2. The water storage tank according to claim 1, characterized in that A heat-conducting structure (6) is provided between the outer tube (22) and the inner container (1).

3. The water storage tank according to claim 2, characterized in that The heat-conducting structure (6) includes heat-conducting silicone grease filled between the outer tube (22) and the outer wall of the inner container (1); And / or, the heat-conducting structure (6) wraps the outer tube (22).

4. The water storage tank according to claim 1, characterized in that The water storage tank further comprises an outer shell (4), the outer shell (4) being sleeved on the outside of the inner tank (1) at intervals, and the shell-and-tube heat exchanger (2) being located between the inner tank (1) and the outer shell (4); The shell and tube heat exchanger (2) further includes connecting pipes (25) connected to both ends of the outer tube (22), the inner cavity of the connecting pipe (25) is communicated with the refrigerant channel (24), the connecting pipe (25) extends out of the outer shell (4), and the water inlet end of the inner tube (21) extends out of the outer shell (4).

5. The water storage tank according to claim 4, characterized in that: A heat-insulating structure (5) is filled between the outer shell (4) and the inner container (1).

6. The water storage tank according to any one of claims 1 to 5, characterized in that: The inlet of the refrigerant channel (24) and the outlet of the water channel (23) are located at the first end of the shell and tube heat exchanger (2), and the outlet of the refrigerant channel (24) and the inlet of the water channel (23) are located at the second end of the shell and tube heat exchanger (2).

7. The water storage tank according to claim 6, characterized in that The inner liner water inlet (11) is arranged at the lower part of the inner liner (1), the inner liner water outlet (12) of the inner liner (1) is arranged at the upper part of the inner liner (1), the shell and tube heat exchange tube is located between the inner liner water inlet (11) and the inner liner water outlet (12), and the lower end of the shell and tube heat exchanger (2) is the first end of the shell and tube heat exchanger (2).

8. The water storage tank according to any one of claims 1 to 5, characterized in that: The water storage tank further comprises a temperature detection component, and the temperature detection component is used to detect the water temperature inside the inner tank (1).

9. A heat pump water heater comprising a compressor (200), a throttling device (300), an evaporator (400) and a gas-liquid separator (500), characterized in that: It also includes a water storage tank as described in any one of claims 1 to 8, wherein the compressor (200), the refrigerant channel (24), the throttling device (300), the evaporator (400) and the gas-liquid separator (500) are connected end to end in sequence to form a refrigerant circulation pipeline.

10. The heat pump water heater according to claim 9, characterized in that The heat pump water heater comprises a cold water supply pipe (800), the cold water supply pipe (800) is connected to the water inlet of the water passage (23), and a flow switch (900) is provided on the cold water supply pipe (800).

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