Water heater and water tank thereof

Abstract

The utility model discloses a water heater and a water tank thereof, and the water tank comprises an inner container which is used for containing water and is provided with a first end and a second end opposite to the first end; the heat transfer device is arranged in the inner container, and the two opposite ends of the heat transfer device extend into the first end and the second end correspondingly; the first heat exchanger is connected to the inner container and used for heating water in the inner container; the heat transfer device is used for transferring heat of water contained in the end, with the higher water temperature, of the first end and the second end to water contained in the end, with the lower water temperature, of the first end and the second end. The water temperature in the inner container of the water tank is uniformly distributed, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical appliances, and more specifically, to a water heater and a water tank thereof. Background Art

[0002] Heat pump water heaters are common items needed in daily life, and the water tank is one of the important devices of heat pump water heaters. The refrigerant flows from top to bottom, so the upper part of the water tank heats up quickly and has a higher temperature, while the lower part of the water tank heats up slowly and has a lower temperature. The water tank generally discharges water from the upper part and replenishes water from the lower part. When the user uses a lot of water, the hot water in the upper part of the water tank is quickly used up and the water replenished in the lower part is low-temperature water. Therefore, if the user keeps draining water, there will be a large difference in water temperature before and after, which seriously affects the user's experience during actual use. Utility Model Content

[0003] The present application proposes a water tank of a water heater, which comprises:

[0004] An inner liner, used to contain water, and provided with a first end and a second end opposite to the first end;

[0005] a heat transfer device, disposed in the inner container, with two opposite ends thereof extending into the first end and the second end respectively; and,

[0006] A first heat exchanger, connected to the inner tank, for heating the water in the inner tank;

[0007] The heat transfer device is used to transfer the heat of the water contained in the end with higher water temperature between the first end and the second end to the water contained in the end with lower water temperature between the first end and the second end.

[0008] In an exemplary embodiment, the heating power of the first heat exchanger for heating the water in the first end is greater than the heating power for heating the water in the second end;

[0009] The heat transfer device comprises:

[0010] An annular tube shell, comprising a first tube section extending from the first end to the second end, wherein the first tube section comprises a first evaporation end located at the first end and a first condensation end located at the second end;

[0011] A phase-change fluid contained in the annular tube shell; and

[0012] The porous layer is arranged on the inner wall of the first tube section and extends from the first condensation end to the first evaporation end.

[0013] In an illustrative embodiment, the heat transfer device further comprises a one-way valve;

[0014] The one-way valve is disposed in the first pipe section and is close to an end of the first evaporation end. The one-way valve can only allow fluid flowing from the first condensation end to the first evaporation end to pass through.

[0015] In an illustrative embodiment, the distance from the one-way valve to the end of the first evaporation end is 0.3 to 0.36 times the length of the first pipe section.

[0016] In an exemplary embodiment, the porous layer is configured in a tubular shape.

[0017] In an illustrative embodiment, the porous layer is made of ceramic fiber or graphite felt.

[0018] In an illustrative embodiment, the air pressure in the annular tube shell is negative pressure.

[0019] In an illustrative embodiment, the inner container is arranged upright or lying down.

[0020] In an illustrative embodiment, the first heat exchanger is provided with a heat exchange channel, a refrigerant inlet provided at one end of the heat exchange channel, and a refrigerant outlet provided at the other end of the heat exchange channel;

[0021] The refrigerant inlet is arranged outside the first end and is used to inject refrigerant into the heat exchange channel. The refrigerant outlet is arranged outside the second end and is used to discharge the refrigerant in the heat exchange channel.

[0022] The present application also proposes a water heater, which comprises the water tank as described above.

[0023] In the technical solution of the present application, the first heat exchanger can heat the water in the inner tank. When the water temperature of the water in the first end of the inner tank is different from the water temperature of the water in the second end of the inner tank, the heat transfer device can transfer the heat of the water contained in the end with higher water temperature between the first end and the second end of the inner tank to the water contained in the end with lower water temperature between the first end and the second end of the inner tank, thereby reducing the temperature difference of the water at both ends of the inner tank and improving the user experience. For example, when the water temperature of the water contained in the first end of the inner tank is higher than the water temperature of the water contained in the second end of the inner tank, the heat transfer device transfers the heat of the water contained in the first end of the inner tank to the water contained in the second end of the inner tank, thereby reducing the temperature difference of the water between the water contained in the first end of the inner tank and the water contained in the second end of the inner tank.

[0024] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0026] Figure 1 It is a structural schematic diagram of a water tank of a water heater in an embodiment of the utility model;

[0027] Figure 2 This is a schematic structural diagram of a vertically arranged water tank in an embodiment of the utility model;

[0028] Figure 3 This is a schematic structural diagram of a heat transfer device in an embodiment of the utility model;

[0029] Figure 4 It is a structural schematic diagram of a water tank arranged in a lying position in an embodiment of the utility model.

[0030] Reference numerals:

[0031] 100, water heater; 200, water tank; 1, inner tank; 11, first end; 12, second end; 13, cylinder; 132, water inlet; 131, water outlet; 14, first end cover; 2, heat transfer device; 21, annular tube shell; 211, first tube section; 2111, first evaporation end; 2112, first condensation end; 212, evaporation tube section; 213, second tube section; 2131, second evaporation end; 213 2. Second condensation end; 214. Condensation pipe section; 22. Porous layer; 23. One-way valve; 24. Phase change fluid; 25. Connector; 3. First heat exchanger; 31. First header; 32. Second header; 33. Heat exchange tube; 34. Heat exchange channel; 35. Refrigerant inlet; 36. Refrigerant outlet; 300. External unit; 301. Compressor; 302. Second heat exchanger; 303. Throttling element; 304. Reversing valve. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the embodiments of the utility model will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0033] like Figure 1 As shown, Figure 1 The structure of a water heater 100 in this embodiment is shown. The water heater 100 may be an air source heat pump water heater. Figure 2As shown, the water heater 100 includes a water tank 200 and an external unit 300. The external unit 300 and the water tank 200 are connected via a refrigerant pipeline, and the refrigerant circulates between the external unit 300 and the water tank 200 to absorb heat from the air to heat the water stored in the water tank 200.

[0034] like Figure 2 As shown, the water tank 200 includes an inner tank 1, a heat transfer device 2 and a first heat exchanger 3. The inner tank 1 has an inner cavity for storing water. The inner tank 1 can be constructed as a cylindrical tank body. The inner tank 1 is provided with a first end 11 and a second end 12. The first end 11 and the second end 12 are arranged opposite to each other. The inner tank 1 can be arranged vertically, and the first end 11 of the inner tank 1 can be an end of the cylinder 13 facing upward, and the second end 12 of the inner tank 1 can be an end facing downward. In this embodiment, the inner tank 1 includes a cylinder 13, a first end cover 14 and a second end cover. The cylinder 13 can be cylindrical. The cylinder 13 is welded by a plate. The plate can be a good conductor of heat, such as a stainless steel plate or an enameled steel plate. The first end cover 14 and the second end cover are constructed as a roughly disc-shaped structure. The first end cover 14 covers one end of the cylinder 13. The second end cover covers the other end of the cylinder 13. The first end cover 14 and the second end cover can be welded to the cylinder 13 , or can be screwed or riveted to the cylinder 13 .

[0035] The first heat exchanger 3 is arranged on the outer peripheral wall of the cylinder 13 of the inner tank 1. The first heat exchanger 3 and the cylinder 13 of the inner tank 1 can be screwed, riveted or welded. The first heat exchanger 3 is provided with a heat exchange channel 34, a refrigerant inlet 35 and a refrigerant outlet 36. The refrigerant inlet 35 and the refrigerant outlet 36 are respectively located at the two ends of the heat exchange channel 34. The refrigerant inlet 35 is used to inject refrigerant into the heat exchange channel 34, and the refrigerant outlet 36 is used to discharge the refrigerant in the heat exchange channel 34 to the outside. The external unit 300 is connected to the refrigerant inlet 35 and the refrigerant outlet 36 of the first heat exchanger 3 through a pipeline. In the heating mode, the external unit 300 transports high-temperature gaseous refrigerant to the refrigerant inlet 35 of the first heat exchanger 3, and the temperature of the gaseous refrigerant is higher than the temperature of the water in the inner tank 1. When the gaseous refrigerant flows through the heat exchange channel 34 of the first heat exchanger 3, it transfers heat to the inner tank 1 to heat the water in the inner tank 1. The gaseous refrigerant releases heat and is converted into liquid refrigerant. The liquid refrigerant is discharged from the refrigerant outlet 36 of the first heat exchanger 3 and flows back to the external unit 300. Thus, the first heat exchanger 3 can heat the water in the inner tank 1.

[0036] The heat transfer device 2 is arranged in the cylinder 13 of the inner tank 1. The opposite ends of the heat transfer device 2 extend into the first end 11 and the second end 12 of the inner tank 1 respectively. The heat transfer device 2 has good heat transfer performance. When the inner tank 1 is filled with water, the heat transfer device 2 is immersed in the water of the inner tank 1. The heat transfer device 2 can transfer the heat of the water contained in the end with higher water temperature between the first end 11 of the inner tank 1 and the second end 12 of the inner tank 1 to the water contained in the end with lower water temperature between the first end 11 of the inner tank 1 and the second end 12 of the inner tank 1.

[0037] In this way, the first heat exchanger 3 can heat the water in the inner tank 1. When the water temperature of the water in the first end 11 of the inner tank 1 is different from the water temperature of the water in the second end 12 of the inner tank 1, the heat transfer device 2 can transfer the heat of the water contained in the end with higher water temperature between the first end 11 and the second end 12 of the inner tank 1 to the water contained in the end with lower water temperature between the first end 11 and the second end 12 of the inner tank 1, thereby reducing the temperature difference of the water at both ends of the inner tank 1 and improving the user experience. For example, when the water temperature of the water contained in the first end 11 of the inner tank 1 is higher than the water temperature of the water contained in the second end 12 of the inner tank 1, the heat transfer device 2 transfers the heat of the water contained in the first end 11 of the inner tank 1 to the water contained in the second end 12 of the inner tank 1, thereby reducing the temperature difference of the water between the water contained in the first end 11 and the water contained in the second end 12 of the inner tank 1. In this way, the heat exchange efficiency between the first heat exchanger 3 and the inner tank 1 can be improved, and the inner tank 1 can also achieve constant temperature water discharge.

[0038] In an exemplary embodiment, the refrigerant inlet 35 is disposed outside the first end 11 of the inner liner 1, and the refrigerant outlet 36 is disposed outside the second end 12 of the inner liner 1. The heat exchange channel 34 extends along the outer peripheral wall of the inner liner 1 from the refrigerant inlet 35 to the refrigerant outlet 36 in a winding manner. The heat exchange channel 34 may be arranged in a serpentine shape.

[0039] When the refrigerant flows along the heat exchange flow channel 34 of the first heat exchanger 3, the water in the first end 11 of the inner tank 1 is heated first, and then the water in the second end 12 of the inner tank 1 is heated. Since the temperature of the refrigerant will decrease after the refrigerant heats the water in the first end 11 of the inner tank 1, the temperature difference between the refrigerant and the inner tank 1 after the temperature decreases will decrease, and the heat exchange efficiency between the first heat exchanger 3 and the second end 12 of the inner tank 1 will decrease, and even throttling will occur, resulting in the heating power of the first heat exchanger 3 when heating the water in the first end 11 of the inner tank 1 being greater than the heating power of the first heat exchanger 3 when heating the water in the second end 12 of the inner tank 1, which will further cause the water temperature of the water in the first end 11 of the inner tank 1 to be higher than the water temperature of the water in the second end 12 of the inner tank 1.

[0040] like Figure 3As shown, the heat transfer device 2 includes an annular tube shell 21, a phase change fluid 24 and a porous layer 22. The annular tube shell 21 is constructed as an annular tubular structure. The annular tube shell 21 can be made of plastic, glass or stainless steel. The annular tube shell 21 includes a first tube section 211, an evaporation tube section 212, a second tube section 213 and a condensation tube section 214 connected in sequence. The first tube section 211 and the second tube section 213 both extend from the first end 11 of the inner liner 1 to the second end 12 of the inner liner 1. The first tube section 211 and the second tube section 213 can both be constructed as straight strips. The first tube section 211 and the second tube section 213 can be arranged to be parallel to each other. The first tube section 211 and the second tube section 213 are spaced apart from each other. The first tube section 211 includes a first evaporation end 2111 and a first condensation end 2112, and the first evaporation end 2111 and the first condensation end 2112 are arranged opposite to each other. The first evaporation end 2111 is arranged in the first end 11 of the inner pot 1, and the first condensation end 2112 is arranged in the second end 12 of the inner pot 1. The second pipe section 213 includes a second evaporation end 2131 and a second condensation end 2132, and the second evaporation end 2131 and the second condensation end 2132 are arranged opposite to each other. The second evaporation end 2131 is arranged in the first end 11 of the inner pot 1, and the second condensation end 2132 is arranged in the second end 12 of the inner pot 1. The evaporation pipe section 212 is located in the first end 11 of the inner pot 1, and the evaporation pipe section 212 can be an arc-shaped pipe. One end of the evaporation pipe section 212 is connected to the first evaporation end 2111 of the first pipe section 211, and the other end of the evaporation pipe section 212 is connected to the second evaporation end 2131 of the second evaporation pipe section 212. The condensation pipe section 214 is arranged in the second end 12 of the inner pot 1, and the condensation pipe section 214 can be an arc-shaped pipe. One end of the condensation pipe section 214 is connected to the first condensation end 2112 of the first pipe section 211 , and the other end of the condensation pipe section 214 is connected to the second condensation end 2132 of the second pipe section 213 .

[0041] The phase change fluid 24 is contained in the annular tube shell 21. The phase change fluid 24 can be ether or dichloromethane. The phase change fluid 24 can be converted between gaseous state and liquid state during operation.

[0042] The porous layer 22 is made of porous material and covers the inner wall of the first pipe section 211. The porous layer 22 extends from the first condensation end 2112 of the first pipe section 211 to the first evaporation end 2111.

[0043] Since the heating power of the first heat exchanger 3 for heating the water in the first end 11 of the inner tank 1 is greater than the heating power for heating the water in the second end 12 of the inner tank 1 , the water temperature in the first end 11 is higher than the water temperature in the second end 12 . Due to the capillary phenomenon, the liquid phase change fluid 24 can flow along the porous layer 22 from the first condensation end 2112 of the first tube segment 211 to the first evaporation end 2111 of the first tube segment 211. The liquid phase change fluid 24 in the first evaporation end 2111 of the first tube segment 211 absorbs the heat of the water in the first end 11 and evaporates into a gaseous phase change fluid. The gaseous phase change fluid reaches the condensation tube segment 214 due to sequentially flowing through the evaporation tube segment 212 and the second tube segment 213. The gaseous phase change fluid releases heat to the water in the second end 12 of the inner liner 1 in the condensation tube segment 214 and condenses into a liquid phase change fluid. The water in the second end 12 of the inner liner 1 absorbs heat and rises in temperature, thereby reducing the temperature difference between the water temperature in the first end 11 of the inner liner 1 and the water temperature in the second end 12 of the inner liner 1. The water temperatures in the first end 11 and the second end 12 of the inner liner 1 remain basically consistent, thereby improving the user experience.

[0044] In an illustrative embodiment, the heat transfer device 2 further includes a connector 25. The connector 25 may be in a straight strip shape. The connector 25 connects the annular tube shell 21 and the cylinder 13 of the inner tank 1. The connector 25 and the annular tube shell 21 and the connector 25 and the inner tank 1 may be connected by welding or screws. Two connectors 25 may be provided, and the two connectors 25 are respectively provided on opposite sides of the connector 25.

[0045] In an illustrative embodiment, Figure 3 As shown, the heat transfer device 2 further includes a one-way valve 23. The one-way valve 23 may be a plastic diaphragm one-way valve 23 or a spring one-way valve 23. The one-way valve 23 is disposed in the first pipe section 211. The one-way valve 23 is located in the first pipe section 211 at an end close to the first evaporation end 2111. The one-way valve 23 can only pass the fluid flowing from the first condensation end 2112 of the first pipe section 211 to the first evaporation end 2111 of the first pipe section 211.

[0046] In this way, the liquid phase change fluid 24 located between the one-way valve 23 and the end of the first evaporation end 2111 of the first pipe segment 211 cannot flow from the first evaporation end 2111 of the first pipe segment 211 to the first condensation end 2112 of the first pipe segment 211 through the one-way valve 23, and a portion of the liquid phase change fluid 24 can be stored in the first pipe segment 211 between the one-way valve 23 and the end of the first evaporation end 2111 of the first pipe segment 211. This portion of the liquid phase change fluid 24 is located at the first end 11 of the inner tank 1 and can evaporate quickly when the temperature of the first end 11 of the inner tank 1 is high, thereby absorbing a large amount of heat from the water in the first end 11 of the inner tank 1, so that the heat can be transported from the first end 11 of the inner tank 1 to the second end 12 of the inner tank 1 more quickly, thereby improving the heat transfer effect of the heat transfer device 2. At the same time, the one-way valve 23 does not affect the flow of the phase change fluid 24 from the first condensation end 2112 of the first pipe section 211 to the first evaporation end 2111 of the first pipe section 211 , and does not affect the circulation of the phase change fluid 24 in the annular tube shell 21 .

[0047] In an exemplary embodiment, the distance from the one-way valve 23 to the end of the first evaporation end 2111 of the first pipe segment 211 is 0.3 to 0.36 times the length of the first pipe segment 211. The distance from the one-way valve 23 to the end of the first evaporation end 2111 of the first pipe segment 211 is preferably one third of the length of the first pipe segment 211.

[0048] In this way, the length of the first pipe section 211 between the one-way valve 23 and the end of the first evaporation end 2111 of the first pipe section 211 is 0.3 to 0.36 times the total length of the first pipe section 211. This part of the first pipe section 211 can store enough liquid phase change fluid 24 to absorb the heat in the water at the first end 11 of the inner tank 1, thereby improving the heat transfer effect of the heat transfer device 2.

[0049] In an exemplary embodiment, the porous layer 22 is configured as a tube. The porous layer 22 may be an end portion extending from the one-way valve 23 to the first condensation end 2112 along the inner wall of the first tube section 211 .

[0050] The porous layer 22 is tubular, and the outer peripheral wall of the porous layer 22 abuts against the inner wall of the first pipe section 211. The tubular porous layer 22 can transport the liquid phase change fluid faster, which can improve the heat transfer effect of the heat transfer device 2. At the same time, the middle channel of the porous layer 22 can allow gas to flow, avoiding the porous layer 22 from blocking the first pipe section 211.

[0051] In an exemplary embodiment, the porous layer 22 is made of ceramic fiber or graphite felt. Ceramic fiber and graphite felt are light in weight, high temperature resistant, and have good thermal stability, and can transport liquid phase change materials quickly.

[0052] In an illustrative embodiment, the air pressure in the annular tube shell 21 is negative pressure. When manufacturing the heat transfer device 2, after the phase change fluid 24 is injected into the annular tube shell 21, the annular tube shell 21 is evacuated before the annular tube shell 21 is sealed, so that a negative pressure is formed in the annular tube shell 21. The negative pressure is an air pressure less than the standard atmospheric pressure.

[0053] The air pressure in the annular tube shell 21 is less than the standard atmospheric pressure, which can reduce the boiling point of the phase change fluid 24 , so that the phase change fluid 24 can also boil at the water temperature of the first end 11 of the inner tank 1 .

[0054] In an illustrative embodiment, Figure 2 As shown, the inner liner 1 can be erected on the ground, with the first end 11 of the inner liner 1 facing upward and the second end 12 of the inner liner 1 facing downward. The inner liner 1 is arranged vertically, and occupies a small area. Figure 4 As shown, the inner liner 1 can also lie on the ground. When the inner liner 1 lies on the ground, the axis of the inner liner 1 is horizontal, the center of gravity of the inner liner 1 is low, and the placement is more stable.

[0055] Regardless of whether the inner tank 1 is arranged upright or lying down, the heat transfer device 2 can transfer the heat in the first end 11 of the inner tank 1 to the second end 12 of the inner tank 1, so that the water temperature difference between the first end 11 and the second end 12 is small.

[0056] In an illustrative embodiment, Figure 1 As shown, the external unit 300 includes a compressor 301, a second heat exchanger 302, a throttling element 303 and a reversing valve 304. The reversing valve 304 may be a four-way valve. The inlet and outlet of the compressor 301 are connected to the reversing valve 304 through two pipelines respectively. The second heat exchanger 302 is used to exchange heat between the refrigerant flowing through the second heat exchanger 302 and the air, which may be outdoor air. The throttling element 303 may be an electronic expansion valve or a capillary tube. One interface of the second heat exchanger 302 is connected to the reversing valve 304 through a pipeline, and another interface of the second heat exchanger 302 is connected to an interface of the throttling element 303 through a pipeline. The refrigerant inlet of the first heat exchanger 2 is connected to the reversing valve 304, and the refrigerant outlet of the first heat exchanger 2 is connected to another interface of the throttling element 303.

[0057] In the heating mode, the reversing valve 304 connects the inlet of the compressor 301 to the second heat exchanger 302, and connects the outlet of the compressor 301 to the first heat exchanger 2. When the compressor 301 is working, the refrigerant is sucked into the inlet of the compressor 301, and the sucked refrigerant is pressurized and then output from the outlet of the compressor 301 to the first heat exchanger 2. When the high-temperature and high-pressure gaseous refrigerant flows through the first heat exchanger 2, it heats the water in the inner tank 1 and is converted into liquid refrigerant. The liquid refrigerant continues to flow into the throttling element 303, and is converted into a gas-liquid mixed refrigerant when flowing through the throttling element 303. The gas-liquid mixed refrigerant flows to the second heat exchanger 302. When the refrigerant flows through the second heat exchanger 302, it absorbs heat in the air and evaporates into a gaseous refrigerant, and the gaseous refrigerant flows back to the compressor 301.

[0058] In an illustrative embodiment, the inner tank 1 is provided with a water inlet 132 and a water outlet 131. The water inlet 132 and the water outlet 131 are both connected to the inner cavity of the inner tank 1. The water inlet 132 is used to inject water into the inner tank 1. The water outlet 131 is used to discharge the water in the inner tank 1 out of the inner tank 1. The water inlet 132 can be provided at the second end 12 of the inner tank 1, and the water outlet 131 can be provided at the first end 11 of the inner tank 1.

[0059] In an illustrative embodiment, the first heat exchanger 3 includes a first header 31, a second header 32 and a plurality of heat exchange tubes 33. The heat exchange tubes 33, the first header 31 and the second header 32 are all arranged on the outer peripheral wall of the cylinder 13. The first header 31 and the second header 32 can both be configured as straight tubes. Both ends of the first header 31 extend to opposite ends of the cylinder 13 of the inner tank 1.

[0060] The heat exchange tube 33 extends along the circumference of the cylinder 13 and closely adheres to the outer peripheral wall of the cylinder 13. One end of the heat exchange tube 33 is connected to the side wall of the first header 31 facing away from the second header 32, and the other end of the heat exchange tube 33 is connected to the side wall of the second header 32. A plurality of heat exchange tubes 33 are provided, and the plurality of heat exchange tubes 33 are sequentially arranged side by side along the axial direction of the cylinder 13.

[0061] The refrigerant inlet 35 and the refrigerant outlet 36 are respectively disposed at opposite ends of the first header 31 . The first header 31 , the second header 32 and the heat exchange tube 33 are connected to form a serpentine heat exchange channel 34 .

[0062] In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", "'mouth'-shaped structure" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0064] Although the implementation methods disclosed in the utility model are as above, the above contents are only implementation methods adopted to facilitate the understanding of the utility model, and are not used to limit the utility model. Any technician in the field to which the utility model belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the utility model, but the scope of patent protection of the utility model shall still be defined by the attached claims.

Claims

1. A water tank for a water heater, It is characterized in that include: An inner liner, used to contain water, and provided with a first end and a second end opposite to the first end; a heat transfer device, disposed in the inner container, with two opposite ends thereof extending into the first end and the second end respectively; and, A first heat exchanger, connected to the inner tank, for heating the water in the inner tank; The heat transfer device is used to transfer the heat of the water contained in the end with higher water temperature between the first end and the second end to the water contained in the end with lower water temperature between the first end and the second end.

2. The water tank according to claim 1, It is characterized in that The heating power of the first heat exchanger for heating the water in the first end is greater than the heating power for heating the water in the second end; The heat transfer device comprises: An annular tube shell, comprising a first tube section extending from the first end to the second end, wherein the first tube section comprises a first evaporation end located at the first end and a first condensation end located at the second end; A phase-change fluid contained in the annular tube shell; and The porous layer is arranged on the inner wall of the first tube section and extends from the first condensation end to the first evaporation end.

3. The water tank according to claim 2, It is characterized in that The heat transfer device also includes a one-way valve; The one-way valve is disposed in the first pipe section and is close to an end of the first evaporation end. The one-way valve can only allow fluid flowing from the first condensation end to the first evaporation end to pass through.

4. The water tank according to claim 3, It is characterized in that The distance from the one-way valve to the end of the first evaporation end is 0.3 to 0.36 times the length of the first pipe section.

5. The water tank according to claim 2, It is characterized in that The porous layer is configured in a tubular shape.

6. The water tank according to claim 2, It is characterized in that The porous layer is made of ceramic fiber or graphite felt.

7. The water tank according to claim 2, It is characterized in that The air pressure in the annular tube shell is negative pressure.

8. The water tank according to claim 1, It is characterized in that The inner container is arranged upright or lying down.

9. A water tank according to any one of claims 1 to 8, It is characterized in that The first heat exchanger is provided with a heat exchange channel, a refrigerant inlet provided at one end of the heat exchange channel, and a refrigerant outlet provided at the other end of the heat exchange channel; The refrigerant inlet is arranged outside the first end and is used to inject refrigerant into the heat exchange channel. The refrigerant outlet is arranged outside the second end and is used to discharge the refrigerant in the heat exchange channel.

10. A water heater, It is characterized in that Comprising a water tank as claimed in any one of claims 1 to 9.

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