Metal phase transformation heat storage device

Abstract

The invention belongs to the technical field of electric heat storage, discloses a metal phase-change electric heat storage device, and aims to solve the problems that an existing metal phase-change electric heat storage device is provided with inert gas, the inert gas is heated to expand during heat exchange, the air pressure in a heat preservation tank can be increased, the heat absorption deformation process of phase-change metal is influenced, and the heat exchange efficiency is improved. According to the technical scheme, the device comprises a tank body, a plurality of supporting legs are fixedly installed on the bottom face of the tank body, a heat exchange device is arranged above the tank body, a heat preservation inner container is arranged in the tank body, a first heat exchange pipe is fixedly installed in the tank body, and the first heat exchange pipe penetrates through the tank body and the heat preservation inner container and is fixedly connected with the tank body and the heat preservation inner container in a sealed mode. The pressure adjusting device can adjust the pressure change in the heat preservation inner container, adjustment is carried out when the phase change metal absorbs heat and releases heat, the pressure can be reduced during heat absorption, the influence of the pressure on phase change is reduced, the heat release speed is increased by increasing the pressure during heat release, and use is more convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric heat storage, and particularly relates to a metal phase change electric heat storage device. Background Art

[0002] Generally, a heat storage device based on a metal phase change material is to melt the metal material and place it in a corrosion-resistant container tank to form a heat storage tank. An electric heating device and a heat exchange pipeline are in contact with the metal material for heat charging and heat extraction. The heat storage device designed with a metal phase change material can be used in new energy power consumption and regulation, transformation of traditional thermal power plants, solar thermal energy storage power generation, heat storage, heating, and hot water supply for high-end civil and commercial buildings, heat storage for electric small cars and electric buses and used for heating the car cabin and battery thermal insulation in winter, etc. In the prior art, a Chinese patent with the publication number CN112985147B discloses a metal phase change electric heat storage device. In this prior art, by arranging an inert gas, when heat exchange is carried out, the inert gas expands when heated, which can increase the air pressure in the heat preservation tank, and then affect the heat absorption and deformation process of the phase change metal. Summary of the Invention

[0003] In order to solve the above deficiencies in the prior art, the purpose of the present invention is to provide a metal phase change electric heat storage device. The metal phase change electric heat storage device is provided with a pressure regulating device, which can regulate the pressure change in the heat preservation inner tank, and then adjust during the heat absorption and heat release of the phase change metal. When heat is absorbed, the pressure can be reduced to reduce the influence of pressure on the phase change. When heat is released, the heat release speed is accelerated by increasing the pressure, making it more convenient to use.

[0004] The technical solution adopted by the present metal phase change electric heat storage device to solve its technical problems is as follows: A metal phase change electric heat storage device is provided, including a tank body. Several support legs are fixedly installed on the bottom surface of the tank body. A heat exchange device is arranged above the tank body. A heat preservation inner tank is arranged inside the tank body. A first heat exchange pipe is fixedly installed inside the tank body. The first heat exchange pipe penetrates through the tank body and the heat preservation inner tank and is fixedly connected in a sealed manner. Control devices are respectively arranged at the upper and lower ends of the first heat exchange pipe. A phase change metal is contained in the heat preservation inner tank. An inert gas is filled between the top surface of the phase change metal and the top of the heat preservation inner tank. A pressure regulating device is fixedly installed on the top surface of the tank body, and the pressure regulating device communicates with the inside of the heat preservation inner tank.

[0005] Further, several electric heating rods are arranged inside the tank body, and the electric heating rods all penetrate through the top surface of the tank body and the top surface of the heat preservation inner tank and are fixedly connected in a sealed manner.

[0006] Further, the heat exchange device includes a heat exchange box body, a second heat exchange tube, and several baffle plates. The heat exchange box body is fixedly installed on the top surface of the tank body. The second heat exchange tube is fixedly installed inside the heat exchange box body. Circulation pipes are respectively fixedly installed on both sides of the heat exchange box body. One ends of the circulation pipes communicate with the second heat exchange tube. The other ends of the circulation pipes are respectively connected to and communicate with the corresponding control devices. The baffle plates are respectively fixedly installed on the top and bottom surfaces of the inner wall of the tank body. Heat source inlet pipes and heat source outlet pipes are respectively arranged on both sides of the top surface of the heat exchange box body. A pump body is fixedly installed on the circulation pipe.

[0007] Further, the control device includes a control box body. The control box bodies are respectively fixedly installed on the top and bottom surfaces of the tank body. The control box bodies communicate with the first heat exchange tube. The control box bodies are both connected to the heat exchange device. A piston block is arranged inside the control box body. Heat insulation blocks are respectively fixedly installed on the piston block. A moving device for driving the piston block to move up and down is arranged on the control box body.

[0008] Further, the moving device includes a first electric push rod. The movable end of the first electric push rod penetrates through the opposite sides of the control box body and is fixedly connected. The movable end of the first electric push rod is fixedly connected to the piston block.

[0009] Further, the pressure regulating device includes a pressure regulating box. The pressure regulating box is fixedly installed on the top surface of the tank body. The pressure regulating box and the heat preservation inner liner are fixedly connected and communicated through a connecting pipe. A piston plate that is slidably matched with the pressure regulating box is arranged inside the pressure regulating box. A second electric push rod is fixedly installed on one side of the pressure regulating box. The movable end of the second electric push rod is fixedly connected to the bottom surface of a moving plate. The bottom surface of the moving plate is fixedly connected to the top surface of the piston plate through a connecting rod. The connecting rod penetrates through the top surface of the pressure regulating box and is in clearance fit.

[0010] Further, an inflation pipe is arranged on the pressure regulating box. The inflation pipe penetrates through the moving plate, the connecting rod, and the movable plate and is fixedly connected in a sealed manner. A normally closed quick joint is fixedly installed at the upper end of the inflation pipe.

[0011] Further, the space between the tank body and the heat preservation inner liner is treated as a hollow space.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. A metal phase change electric heat storage device according to an embodiment of the present invention. Through a heat exchange device, a heat source can exchange heat with a working medium. The control device controls the working medium to enter the first heat exchange tube, and the working medium exchanges heat with the phase change metal, causing the phase change metal to undergo a metal phase change. At the same time, the inert gas at the top of the heat preservation inner tank heats up and expands, increasing the pressure inside the heat preservation inner tank. The pressure regulating device can regulate and reduce the air pressure inside the heat preservation inner tank, thereby reducing the influence of pressure on the metal phase change. In addition, when the phase change metal releases heat, the pressure regulating device can increase the air pressure inside the heat preservation inner tank, accelerating the heat release rate of the phase change metal. It is convenient to use. Compared with the prior art, the present invention is provided with a pressure regulating device, which can regulate the pressure change inside the heat preservation inner tank, and then adjust during the heat absorption and heat release of the phase change metal. When absorbing heat, it can reduce the pressure and reduce the influence of pressure on the phase change. When releasing heat, by increasing the pressure, the heat release rate is accelerated, making it more convenient to use.

[0013] 2. A metal phase change electric heat storage device according to an embodiment of the present invention includes a tank body. The electric heating rod can convert electrical energy into heat energy, and then heat the phase change metal to cause the phase change metal to store energy.

[0014] 3. A metal phase change electric heat storage device according to an embodiment of the present invention adds a heat source into a heat exchange box body along a heat source inlet pipe. The pump body drives the working medium in the circulation pipe to flow. When the working medium passes through the second heat exchange tube, it can exchange heat with the heat source. The working medium in the second heat exchange tube enters the first heat exchange tube through the control device. The structure of this heat exchange device is simple and convenient to use. The baffle can increase the flow path of the heat source, enabling the heat source and the working medium to fully conduct heat transfer. 4. A metal phase change electric heat storage device according to an embodiment of the present invention can control the piston block to move up and down through a moving device. The heat insulation block can cover the end of the first heat exchange tube, thereby preventing the first heat exchange tube from communicating with the heat exchange device.

[0015] 5. A metal phase change electric heat storage device according to an embodiment of the present invention can drive the piston block to move up and down by controlling the expansion and contraction of the first electric push rod. The structure of this moving device is simple and convenient to use.

[0016] 6. A metal phase change electric heat storage device according to an embodiment of the present invention can drive the moving plate to move up and down by controlling the expansion and contraction of the second electric push rod. The up and down movement of the moving plate drives the piston plate to move up and down through a connecting rod, and the up and down movement of the piston plate can adjust the air pressure intensity inside the heat preservation inner tank.

[0017] 7. A metal phase-change electric heat storage device according to an example of the present invention can be connected to a gas tank filled with inert gas through a normally-closed fast structure. The inert gas is filled into a pressure regulating box through a pressure pump, so as to make up for the loss of inert gas during daily use. In addition, the pressure regulating range of the pressure regulating device can be adjusted by filling and discharging the inert gas.

[0018] 8. A metal phase-change electric heat storage device according to an example of the present invention, after being hollowed out, can reduce the heat dissipation of the phase-change metal in the heat preservation inner tank, and further improve the heat preservation effect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings: Figure 1 It is a schematic structural diagram of the present invention.

[0020] In the figure: 1, tank body; 2, heat preservation inner tank; 3, first heat exchange tube; 4, phase-change metal; 5, electric heating rod; 6, heat exchange box body; 7, second heat exchange tube; 8, baffle plate; 9, pump body; 10, control box body; 11, piston block; 12, heat insulation block; 13, first electric push rod; 14, pressure regulating box; 15, piston plate; 16, second electric push rod; 17, moving plate; 18, gas filling pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. In addition, it should be noted that only the parts related to the invention are shown in the drawings for the convenience of description.

[0022] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0023] As Figure 1As shown in the figure, a metal phase change electric heat storage device includes a tank body 1. Several support legs are fixedly installed on the bottom surface of the tank body 1. A heat exchange device is arranged above the tank body 1. A heat preservation inner tank 2 is arranged inside the tank body 1. A first heat exchange tube 3 is fixedly installed inside the tank body 1. The first heat exchange tube 3 penetrates through the tank body 1 and the heat preservation inner tank 2 and is fixedly connected in a sealed manner. Control devices are respectively arranged at the upper and lower ends of the first heat exchange tube 3. A phase change metal 4 is contained in the heat preservation inner tank 2. An inert gas is filled between the top surface of the phase change metal 4 and the top of the heat preservation inner tank 2. A pressure regulating device is fixedly installed on the top surface of the tank body 1. The pressure regulating device communicates with the inside of the heat preservation inner tank 2. Through the heat exchange device, the heat source can exchange heat with the working medium. By controlling the control device, the working medium enters the first heat exchange tube 3. The working medium exchanges heat with the phase change metal, causing the phase change metal to undergo a metal phase change. At the same time, the inert gas at the top of the heat preservation inner tank 2 heats up and expands, which can increase the pressure inside the heat preservation inner tank 2. The pressure regulating device can adjust and reduce the air pressure inside the heat preservation inner tank 2, thereby reducing the influence of pressure on the metal phase change. In addition, when the phase change metal 4 releases heat, the pressure regulating device can increase the air pressure inside the heat preservation inner tank 2, which can accelerate the heat release speed of the phase change metal 4. It is convenient to use. Compared with the prior art, the present invention is provided with a pressure regulating device, which can adjust the pressure change inside the heat preservation inner tank 2, and then adjust during the heat absorption and heat release of the phase change metal. When absorbing heat, the pressure can be reduced to reduce the influence of pressure on the phase change. When releasing heat, by increasing the pressure, the heat release speed can be accelerated, making it more convenient to use.

[0024] As Figure 1 shown, further preferably, several electric heating rods 5 are arranged inside the tank body 1. The electric heating rods 5 are made of stainless steel with high temperature and corrosion resistance. A heating resistance wire is arranged inside the electric heating rods 5. Adaptor plugs are respectively arranged at the power supply ends of the electric heating rods 5. The electric heating rods 5 all penetrate through the top surface of the tank body 1 and the top surface of the heat preservation inner tank 2 and are fixedly connected in a sealed manner. The electric heating rods 5 can convert electrical energy into heat energy, and then heat the phase change metal to cause the phase change metal to store energy.

[0025] As Figure 1As shown in the figure, further preferably, the heat exchange device includes a heat exchange box body 6, a second heat exchange tube 7 and several baffle plates 8. The heat exchange box body 6 is fixedly installed on the top surface of the tank body 1. The second heat exchange tube 7 is fixedly installed inside the heat exchange box body 6. Circulation pipes are respectively fixedly installed on both sides of the heat exchange box body 6. A thermal power generator is arranged on the circulation pipes. The thermal power generator can convert heat energy into electrical energy. One end of each circulation pipe communicates with the second heat exchange tube 7, and the other end of each circulation pipe is respectively connected to and communicates with the corresponding control device. The baffle plates 8 are respectively fixedly installed on the top surface and the bottom surface of the tank body 1. The baffle plates 8 are arranged in a staggered manner up and down. The second heat exchange tube 7 penetrates through each baffle plate 8 and is fixedly connected. Heat source inlet pipes and heat source outlet pipes are respectively arranged on both sides of the top surface of the heat exchange box body 6. A pump body 9 is fixedly installed on the circulation pipe. The heat source is added into the heat exchange box body 6 along the heat source inlet pipe. The pump body 9 drives the working medium in the circulation pipe to flow. When the working medium passes through the second heat exchange tube 7, it can exchange heat with the heat source. The working medium in the second heat exchange tube 7 enters the first heat exchange tube 3 through the control device. The structure of this heat exchange device is simple and convenient to use. The baffle plates 8 can increase the flow path of the heat source, so that the heat source and the working medium can fully transfer heat.

[0026] As Figure 1 shown in the figure, further preferably, the control device includes a control box body 10. The control box body 10 is respectively fixedly installed on the top surface and the bottom surface of the tank body 1. The control box body 10 communicates with the first heat exchange tube 3. The control box body 10 is communicated with the heat exchange device. The control box body 10 is respectively fixedly connected to and communicates with the corresponding circulation pipe. A piston block 11 is arranged inside the control box body 10. Heat insulation blocks 12 are respectively fixedly installed on the piston block 11. The piston block 11 can seal and block the communication holes between the control box body 10 and the heat exchange device. A moving device for driving the piston block 11 to move up and down is arranged on the control box body 10. The piston block 11 can be controlled to move up and down through the moving device. The heat insulation blocks 12 can cover the ends of the first heat exchange tube 3, so as to avoid the communication between the first heat exchange tube 3 and the heat exchange device.

[0027] As Figure 1 shown in the figure, further preferably, the moving device includes a first electric push rod 13. The movable end of the first electric push rod 13 penetrates through the opposite side of the control box body 10 and is fixedly connected to the piston block 11. The movable end of the first electric push rod 13 is fixedly connected. Through holes are respectively opened on the opposite sides of the control box body 10. The through holes can make the space on the opposite side of the piston block 11 communicate with the outside, so that the piston block 11 can move up and down. The piston block 11 can be driven to move up and down by controlling the telescopic movement of the first electric push rod 13. The structure of this moving device is simple and convenient to use.

[0028] As Figure 1As shown in the figure, further preferably, the pressure regulating device includes a pressure regulating box 14, which is fixedly installed on the top surface of the tank body 1. The pressure regulating box 14 is fixedly connected and communicated with the heat preservation inner tank 2 through a connecting pipe. The connecting pipe penetrates through the tank body 1 and the heat preservation inner tank 2 and is hermetically connected. A piston plate 15 that is slidably matched with it is arranged in the pressure regulating box 10. A pressure sensor is embedded in the bottom surface of the pressure regulating box 14, and the pressure sensor can monitor the pressure at the bottom of the pressure regulating box 10, which is more convenient to use. A second electric push rod 16 is fixedly installed on one side of the pressure regulating box 14. The movable end of the second electric push rod 16 is fixedly connected to the bottom surface of the moving plate 17. The bottom surface of the moving plate 17 is fixedly connected to the top surface of the piston plate 15 through a connecting rod. The connecting rod penetrates through the top surface of the pressure regulating box 14 and has a clearance fit. By controlling the expansion and contraction of the second electric push rod 16, the moving plate 17 can be driven to move up and down. The up and down movement of the moving plate 17 drives the piston plate 15 to move up and down through the connecting rod, and the up and down movement of the piston plate 15 can adjust the air pressure intensity in the heat preservation inner tank 2.

[0029] As Figure 1 shown in the figure, further preferably, an inflation pipe 18 is arranged on the pressure regulating box 14. The inflation pipe 18 penetrates through the moving plate 17, the connecting rod and the movable plate 15 and is hermetically and fixedly connected. A normally closed quick joint is fixedly installed at the upper end of the inflation pipe 18. Through the normally closed quick structure, it can be connected to a gas cylinder filled with inert gas, and the inert gas is filled into the pressure regulating box 14 through a pressure pump, so as to make up for the loss of inert gas during daily use. In addition, by filling and discharging inert gas, the pressure regulating range of the pressure regulating device can be adjusted.

[0030] As Figure 1 shown in the figure, further preferably, the space between the tank body 1 and the heat preservation inner tank 2 is processed into a hollow. After the hollow processing, the heat dissipation of the phase change metal in the heat preservation inner tank 2 can be reduced, and the heat preservation effect of the present invention can be further improved.

[0031] The above description is only the preferred embodiment of the present application and the description of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

[0032] Except for the technical features described in the specification, the rest of the technical features are known to those skilled in the art. To highlight the innovative features of the present invention, the rest of the technical features are not described herein again.

Claims

1. A metal phase change electro-thermal energy storage device, comprising a tank body (1), several support legs are fixedly installed on the bottom surface of the tank body (1), and a heat exchange device is arranged above the tank body (1), and the characteristics are that, Inside the tank body (1), there is a heat-insulating inner tank (2). A first heat exchange tube (3) is fixedly installed inside the tank body (1). The first heat exchange tube (3) penetrates through the tank body (1) and the heat-insulating inner tank (2) and is fixedly connected in a sealed manner. Control devices are respectively arranged at the upper and lower ends of the first heat exchange tube (3). A phase change metal (4) is contained inside the heat-insulating inner tank (2). An inert gas is filled between the top surface of the phase change metal (4) and the top of the heat-insulating inner tank (2). A pressure regulating device is fixedly installed on the top surface of the tank body (1), and the pressure regulating device communicates with the inside of the heat-insulating inner tank (2).

2. The metal phase change electro-thermal storage device according to claim 1, characterized in that Several electric heating rods (5) are arranged inside the described tank body (1). The electric heating rods (5) all penetrate through the top surface of the tank body (1) and the top surface of the heat-insulating inner tank (2) and are fixedly connected in a sealed manner.

3. The metal phase change electric heat storage device according to claim 1, characterized in that, The heat exchange device includes a heat exchange box body (6), a second heat exchange tube (7) and several baffle plates (8). The heat exchange box body (6) is fixedly installed on the top surface of the tank body (1). The second heat exchange tube (7) is fixedly installed inside the heat exchange box body (6). Circulation pipes are respectively fixedly installed on both sides of the heat exchange box body (6). One end of each circulation pipe communicates with the second heat exchange tube (7). The other ends of the circulation pipes are respectively connected to and communicate with the corresponding control devices. The baffle plates (8) are respectively fixedly installed on the top and bottom inner walls of the tank body (1). Heat source inlet pipes and heat source outlet pipes are respectively arranged on both sides of the top surface of the heat exchange box body (6). A pump body (9) is fixedly installed on the circulation pipe.

4. The metal phase change electro-thermal energy storage device according to claim 1, wherein, The control device includes a control box body (10). The control box bodies (10) are respectively fixedly installed on the top and bottom surfaces of the tank body (1). The control box bodies (10) communicate with the first heat exchange tube (3). The control box bodies (10) are both connected to the heat exchange device. A piston block (11) is arranged inside the control box body (10). Heat insulation blocks (12) are respectively fixedly installed on the piston block (11). A moving device for driving the piston block (11) to move up and down is arranged on the control box body (10).

5. The metal phase change electro-thermal energy storage device according to claim 4, characterized in that, The moving device includes a first electric push rod (13). The movable end of the first electric push rod (13) penetrates through the opposite sides of the control box body (10) and is fixedly connected. The movable end of the first electric push rod (13) is fixedly connected to the piston block (11).

6. The metal phase change electric heat storage device according to claim 1, characterized in that, The pressure regulating device includes a pressure regulating box (14). The pressure regulating box (14) is fixedly installed on the top surface of the tank body (1). The pressure regulating box (14) and the heat preservation inner tank (2) are fixedly connected and communicate with each other through a connecting pipe. A piston plate (15) that is slidably matched with the pressure regulating box (14) is arranged inside the pressure regulating box (10). A second electric push rod (16) is fixedly installed on one side of the pressure regulating box (14). The movable end of the second electric push rod (16) is fixedly connected to the bottom surface of the moving plate (17). The bottom surface of the moving plate (17) is fixedly connected to the top surface of the piston plate (15) through a connecting rod. The connecting rod penetrates through the top surface of the pressure regulating box (14) and has a clearance fit.

7. The metal phase change electro-thermal energy storage device according to claim 6, characterized in that, An inflation pipe (18) is arranged on the pressure regulating box (14). The inflation pipe (18) penetrates through the moving plate (17), the connecting rod and the movable plate (15) and is fixedly connected in a sealed manner. A normally closed quick connector is fixedly installed at the upper end of the inflation pipe (18).

8. A metal phase change electro-thermal energy storage device according to any one of claims 1-7, characterized in that, A hollow treatment is adopted between the tank body (1) and the heat-insulating inner tank (2).

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