Electric water heater with high-specific-enthalpy solid-state energy storage layer

Abstract

An electric water heater with a high-specific-enthalpy solid-state energy storage layer comprises a shell, an inner container and a heat preservation layer, the heat preservation layer is located between the shell and the inner container, the electric water heater further comprises the solid-state energy storage layer at least partially wrapping the outer surface of the inner container, and the specific enthalpy of the solid-state energy storage layer is not lower than 170 kJ / kg. The thermal expansion coefficient of the solid-state energy storage layer is not higher than 0.2% 1 / DEG C, the solid-state energy storage layer comprises at least one forming part, and the forming part is formed through injection molding or extrusion molding. Compared with the prior art, the technical scheme provided by the utility model has the advantages of high heat storage performance, good heat preservation effect, simple structure, low danger coefficient, small processing difficulty, high stability, low operation cost, long service life and capability of realizing energy storage peak load shifting.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of electric water heater with high specific enthalpy solid energy storage layer. BACKGROUND

[0002] With the increasingly severe global energy situation, energy-saving and emission-reducing technology has become the focus of competition in various fields. Especially under the guidance of the national carbon peak and carbon neutralization target, the electric water heater field has also become a frontier application field of energy-saving and emission-reducing technology, and has played an important role in reducing energy consumption, waste heat recycling, clean heat preservation, energy storage peak shifting and so on. At present, there are not many products on the market that can simultaneously achieve waste heat recycling, clean heat preservation, energy storage peak shifting and so on. The electric water heater using phase change material for energy storage belongs to one of them.

[0003] For example, a Chinese invention application with application publication number CN101943466A and titled "Phase change energy storage type electric water heater" discloses: a water heater shell, a heat preservation layer, an inner container, a magnesium rod, a pollution discharge port, a hot water outlet, a cold water inlet, a leakage protection switch, a temperature controller, and an electric heating pipe. The heat preservation layer between the water heater shell and the inner container is designed as a composite heat preservation layer, which is composed of a polyurethane foam heat insulation layer and a phase change heat storage layer. Energy saving of the water storage type electric water heater is achieved through the double heat preservation of heat storage and heat insulation coupling. The polyurethane foam heat insulation layer is located between the shell and the phase change heat storage layer, and the phase change heat storage layer is tightly attached to the outer wall of the inner container. The total thickness of the composite heat preservation layer is 25-45 mm, and the thickness ratio of the phase change heat storage layer to the polyurethane foam heat insulation layer is 0.4-6.8. The technical solution of the invention application uses a phase change energy storage layer with a melting point of 50-75°C for heat storage, which needs to consider a series of problems such as spatial change of the heat storage layer when it undergoes phase change at high temperature, leakage of the material after phase change, gasification, etc., which can easily cause deformation and threaten the safety of the product structure, with a very high risk coefficient.

[0004] For another example, a Chinese utility model patent with authorization announcement number CN205690680U and titled "Phase change energy storage electric water heater" discloses: a shell, an inner container, a heat preservation layer, a containing cavity closely arranged adjacent to the wall of the inner container, and the containing cavity is filled with phase change energy storage material. The electric water heater is a water storage type electric water heater, one end of the inner container is provided with a flange plate, an electric heating rod is installed on the flange plate, and the electric heating rod extends into the inner container from the flange plate. The technical solution of the utility model still uses low-melting-point phase change energy storage material for energy storage, so a containing cavity with large space occupation is needed to be separately arranged for filling the phase change energy storage material to prevent the energy storage material from leaking or losing after phase change or producing gasification pressure increase, which has large processing difficulty, complex structure and high risk. UTILITY MODEL CONTENT

[0005] The electric water heater with the solid-state energy storage layer has high heat storage performance, good heat preservation effect, simple structure, low danger coefficient, small processing difficulty, high stability, low operation cost, long service life and can realize energy storage peak load shifting.

[0006] The electric water heater with the solid-state energy storage layer has high heat storage performance, good heat preservation effect, simple structure, low danger coefficient, small processing difficulty, high stability, low operation cost, long service life and can realize energy storage peak load shifting.

[0007] The electric water heater with the solid-state energy storage layer has high heat storage performance, good heat preservation effect, simple structure, low danger coefficient, small processing difficulty, high stability, low operation cost, long service life and can realize energy storage peak load shifting.

[0008] The solid-state energy storage layer is located between the heat preservation layer and the inner container.

[0009] The material of the solid-state energy storage layer contains 1-40% of graphene.

[0010] The solid-state energy storage layer is provided with a gap for accommodating the inner container.

[0011] The solid-state energy storage layer includes at least two shaped parts, which are in at least one of a cylindrical shape, an arc-shaped plate shape, an arc-shaped ring shape, a hemispherical shape, a half-capsule shape or an oval bathtub shape.

[0012] The inner container is provided with a mounting ring seat at the container opening.

[0013] The inner container is recessed inward on the side opposite to the container opening to form the buffer cavity with the inner side wall of the solid-state energy storage layer.

[0014] The inner container is recessed inward on the side opposite to the container opening to form the buffer cavity with the inner side wall of the solid-state energy storage layer.

[0015] The mounting ring seat is provided with a flange plate to block the container opening.

[0016] The solid-state energy storage layer is provided with a positioning part on the side opposite to the flange plate.

[0017] The utility model discloses the following beneficial effects are provided: by the advantage that solid energy storage layer does not change phase, avoid setting similar cavity structure to provide liquefaction, expansion space for energy storage, thereby reduce the space occupation of solid energy storage layer, solid energy storage layer adopts injection moulding or extrusion forming forming piece, and the processing difficulty is small, and it is convenient to assemble, and production efficiency is high, the solid energy storage layer material contains graphene, can significantly improve the heat exchange efficiency of solid energy storage layer, better realize energy storage peak load shifting, the setting of buffer cavity provides buffer space for the possible tiny deformation of inner bag or solid energy storage layer, prevents the large area cracking of inner bag and solid energy storage layer and separates and influences heat transfer effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is electric water heater structure schematic diagram of the application.

[0019] Figure 2 It is Figure 1 Partial structure explosion chart.

[0020] Figure 3 It is Figure 1 Structure schematic diagram of rotating section plane shown in A-A.

[0021] Figure 4 It is solid energy storage layer schematic diagram with water inlet pipe, water outlet pipe, flange and mounting ring seat etc..

[0022] Figure 5 It is solid energy storage layer partial structure explosion schematic diagram with inner hanging rack and outer hanging rack etc..

[0023] Figure 6 It is Figure 3 B part enlarged view.

[0024] Figure 7 It is forming piece side schematic diagram with inner hanging rack, outer hanging rack and partial inner bag.

[0025] Figure 8 It is Figure 7 Backward side schematic diagram.

[0026] 1 shell, 2 inner bag, 21 mounting ring seat, 3 heat preservation layer, 4 solid energy storage layer, 40 let room gap, 400 positioning piece, 401 first let room gap, 402 second let room gap, 403 third let room gap, 41 forming piece, N inner hanging rack, M outer hanging rack, K buffer cavity, 5 flange. DETAILED DESCRIPTION

[0027] The utility model discloses the following beneficial effects are provided: by the advantage that solid energy storage layer does not change phase, avoid setting similar cavity structure to provide liquefaction, expansion space for energy storage, thereby reduce the space occupation of solid energy storage layer, solid energy storage layer adopts injection moulding or extrusion forming forming piece, and the processing difficulty is small, and it is convenient to assemble, and production efficiency is high, the solid energy storage layer material contains graphene, can significantly improve the heat exchange efficiency of solid energy storage layer, better realize energy storage peak load shifting, the setting of buffer cavity provides buffer space for the possible tiny deformation of inner bag or solid energy storage layer, prevents the large area cracking of inner bag and solid energy storage layer and separates and influences heat transfer effect.

[0028] Referring to Figures 2-4, 5-8, an electric water heater with a high specific enthalpy solid-state energy storage layer, comprising a shell 1, an inner container 2 and a thermal insulation layer 3, the thermal insulation layer 3 is located between the shell 1 and the inner container 2, further comprising a solid-state energy storage layer 4 at least partially wrapped around the outer surface of the inner container 2, the specific enthalpy of the solid-state energy storage layer 4 is not less than 170kJ / kg, the thermal expansion coefficient of the solid-state energy storage layer 4 is not higher than 0.2% 1 / ℃, the solid-state energy storage layer 4 comprises at least one shaped part 41, the shaped part 41 is injection molded or extrusion molded. In this application, the space occupation of the solid-state energy storage layer is small, and there is no need to set a cavity to provide the space required for liquefaction and expansion of the phase change energy storage material. In this application, the solid-state energy storage layer remains in a solid phase after absorbing heat and has a very low thermal expansion coefficient, so it will not liquefy and expand at high temperatures, which can cause the energy storage layer to leak and expand, and it has higher stability, lower operating cost and longer service life. In this application, the specific enthalpy of the solid-state energy storage layer is high, which can store and release more heat, and the heat exchange capacity is several times that of the ordinary energy storage layer of conventional products. In this application, the thermal expansion coefficient of the solid-state energy storage layer is very low, even if there is a slight deformation, it will not cause the solid-state energy storage layer to be separated from the inner container in a large area, and the heat exchange performance is high. In this application, the shaped part forming the solid-state energy storage layer is injection molded or extrusion molded, which has low processing difficulty, and the density of the shaped part after molding is 2-5 times that of the phase change energy storage layer, and the heat storage capacity is about 3-8 times that of the current phase change energy storage layer, and the heat storage performance is excellent.

[0029] Referring to Figure 3 As shown in the figure, the solid-state energy storage layer 4 is located between the thermal insulation layer 3 and the inner container 2. Preferably, the thermal insulation layer 3 completely wraps the solid-state energy storage layer 4, at this time, the solid-state energy storage layer 4 can completely wrap the inner container 2 or the solid-state energy storage layer 4 partially wraps the inner container 2, or the thermal insulation layer 3 partially wraps the solid-state energy storage layer 4, at this time, the solid-state energy storage layer 4 can completely wrap the inner container 2 or the solid-state energy storage layer 4 partially wraps the inner container 2. Preferably, the solid-state energy storage layer 4 completely wraps the inner container 2, or the solid-state energy storage layer 4 partially wraps the inner container 2, when the solid-state energy storage layer 4 completely wraps the inner container 2, it can be in 360-degree large-area and omnidirectional heat exchange with the inner container 2, the heat exchange efficiency is high, and it can "peak shaving" through the heat transfer of temperature difference to store energy for the hot water in the inner container, and the heat utilization rate is higher. In this application, the thermal insulation layer is directly foamed and filled between the shell and the solid-state energy storage layer with foaming material, which can isolate the solid-state energy storage layer and reduce the heat loss from the shell direction, and the heat loss is small.

[0030] Referring to Figures 1-8 As shown in the figure, the material of the solid-state energy storage layer 4 contains 1-40% mass percentage of graphene. In this application, graphene has very good heat conduction performance and high thermal conductivity, and adding 1-40% mass percentage of graphene in the material of the solid-state energy storage layer can significantly improve the heat exchange efficiency of the solid-state energy storage layer. Preferably, 5-38% mass percentage of graphene is added to the material of the solid-state energy storage layer.

[0031] Referring to Figure 4 , 5 , 7, 8, the solid energy storage layer 4 is provided with a let-out notch 40 arranged along the axial direction or the circumferential direction. Preferably, the let-out notch 40 includes a first let-out notch 401 and a second let-out notch 402. The first let-out notch 401 is used for letting out the inner hanger N and the outer hanger M, so that the solid energy storage layer 4 is separated from the inner hanger N and the outer hanger M, reducing the heat dissipation of the solid energy storage layer 4 from the inner hanger N and the outer hanger M, and improving the heat utilization rate. The second let-out notch 402 is used for letting out the water inlet pipe and the water outlet pipe. More preferably, the let-out notch 40 can further include a third let-out notch 403, so as to let out the drain. In the present application, the second let-out notch avoids the need to pass the water inlet pipe and the water outlet pipe through the flange, thereby saving costs, avoiding the need to assemble the water inlet pipe and the water outlet pipe through the tank opening, and improving the installation convenience and reliability. Specifically, the cost of adding the water inlet pipe and the water outlet pipe to the flange (about 54 yuan) is about 24 yuan higher than the cost of passing the water inlet pipe and the water outlet pipe through the tank wall (about 30 yuan), and the addition of the water inlet pipe and the water outlet pipe to the flange leads to complex assembly and difficult operation. In the present application, the let-out notch is arranged along the axial direction or the circumferential direction of the electric water heater. For example, the first let-out notch can be arranged along the circumferential direction of the electric water heater for a standing electric water heater, or arranged along the axial direction of the electric water heater for a lying electric water heater, and the second let-out notch can be arranged along the axial direction of the electric water heater for a lying electric water heater.

[0032] Referring to Figure 4 , 7 , 8, the solid energy storage layer 4 includes at least two shaped parts 41, which are at least one of a "cylinder", an "arc plate", an "arc ring", a "hemisphere", a "half capsule", or an "oval bathtub". Preferably, the solid energy storage layer 4 is formed by two mutually opposite shaped parts 41, and the shaped part 41 is in the shape of an "oval bathtub". In the present application, the shaped part is formed by injection molding or extrusion molding, which can meet different shapes, facilitate quick assembly, reduce mold cost, and significantly improve production efficiency.

[0033] Referring to Figures 2-4 , 6, 8, the tank opening of the tank 2 is formed with a mounting ring seat 21, and the outer edge of the mounting ring seat 21 abuts against the edge of the solid energy storage layer 4. Preferably, the mounting ring seat 21 can be integrally formed with the tank opening edge, or the mounting ring seat 21 is located on the outer periphery of the tank opening edge and abuts against the outwardly turned tank opening edge.

[0034] Referring to Figure 3As shown in the drawings, the inner container 2 is formed with a conical or arc-shaped buffer cavity K between the solid energy storage layer 4 on the side opposite to the mouth. In the present application, the buffer cavity provides a buffer space for the possible small deformation of the inner container or the solid energy storage layer, preventing large-area cracking and separation between the inner container and the solid energy storage layer and affecting the heat transfer effect therebetween.

[0035] Referring to Figure 3 As shown in the drawings, the inner container 2 is formed with a conical or arc-shaped buffer cavity K between the solid energy storage layer 4 on the side opposite to the mouth. In the present application, the buffer cavity provides a buffer space for the possible small deformation of the inner container or the solid energy storage layer, preventing large-area cracking and separation between the inner container and the solid energy storage layer and affecting the heat transfer effect therebetween.

[0036] Referring to Figures 2-4 As shown in the drawings, the mounting ring seat 21 is provided with a flange plate 5 to block the mouth, and the flange plate 5 is provided with a heating pipe. In the present application, the water inlet pipe and the water outlet pipe are provided on the inner container, or the water inlet pipe and the water outlet pipe are provided on the flange plate.

[0037] Referring to Figure 3 , 5 As shown in the drawings, the solid energy storage layer 4 is formed with a positioning member 400 on the side opposite to the flange plate 5. In the present application, the positioning member 400 helps to position the components during assembly, making the assembly operation more convenient and fast.

[0038] Although the specific embodiments of the present application have been described above, those skilled in the art can make changes to it without departing from the spirit and principles of the present application, and the protection scope of the present application is defined by the claims and their equivalents.

Claims

1. An electric water heater with high specific enthalpy solid-state energy storage layer, comprising a shell, an inner container and a thermal insulation layer, the thermal insulation layer is located between the shell and the inner container, characterized in that: The solid-state energy storage layer is at least partially wrapped around the outer surface of the inner container, has a specific enthalpy of not less than 170 kJ / kg, a thermal expansion coefficient of not higher than 0.2% 1 / ℃, and comprises at least one shaped member which is injection molded or extrusion molded, and the solid-state energy storage layer contains graphene.

2. The electric water heater with high specific-enthalpy solid-state energy storage layer according to claim 1, characterized in that: The solid-state energy storage layer is located between the thermal insulation layer and the inner container.

3. The electric water heater with high specific-enthalpy solid-state energy storage layer according to claim 1, characterized in that: The solid-state energy storage layer is provided with a clearance gap, which is arranged in an axial direction or a circumferential direction.

4. The electric water heater with high specific-enthalpy solid-state energy storage layer according to any one of claims 1 to 3, characterized in that: The solid-state energy storage layer comprises at least two shaped members, which are at least one of a "cylinder", an "arc plate", an "arc ring", a "hemisphere", a "half capsule", or an "oval bathtub".

5. The electric water heater with high specific-enthalpy solid-state energy storage layer according to claim 4, characterized in that: The inner container is provided with a mounting ring seat at the container mouth, and an outer edge of the mounting ring seat abuts against an edge of the solid-state energy storage layer.

6. The electric water heater with high specific-enthalpy solid-state energy storage layer according to claim 5, characterized in that: The inner container is provided with a conical or arc-shaped buffer cavity between the solid-state energy storage layer on the side opposite to the container mouth.

7. The electric water heater with high specific-enthalpy solid-state energy storage layer according to claim 6, characterized in that: The inner container is recessed inward on the side opposite to the container mouth to form the buffer cavity with an inner side wall of the solid-state energy storage layer, and a normal projection area of the buffer cavity on the inner container is less than 1.56% of an area of the inner container.

8. The electric water heater with high specific-enthalpy solid-state energy storage layer according to claim 5, characterized in that: The mounting ring seat is provided with a flange plate to block the container mouth, and the flange plate is provided with a heating pipe.

9. The electric water heater with high specific-enthalpy solid-state energy storage layer according to claim 8, characterized in that: The solid-state energy storage layer is provided with a positioning member on the side opposite to the flange plate.

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