CN113324277B - Metal phase transformation heat accumulation heating device - Google Patents

Abstract

The invention relates to the technical field of energy storage equipment, in particular to a metal phase transformation heat storage and supply device, which comprises: the bottom of the shell is provided with a supporting component; the heat storage assembly is arranged in the shell, the heat storage assembly is arranged on the upper side of the supporting assembly, the heat storage assembly comprises heating units and heat storage units which are alternately arranged along the height direction, the heat storage units comprise a plurality of heat storage modules which are arranged in an array, accommodating cavities are formed in the heat storage modules and are used for accommodating metal phase change materials, and ventilation flow channels are reserved among the heat storage modules; the air distribution plate is uniformly provided with a plurality of through holes and is arranged between the air inlet and the heat storage component. The electric energy is converted into heat energy and stored in the electricity consumption valley, and the pre-stored heat energy can be utilized to produce and live in the electricity consumption peak period, so that the full and reasonable utilization of resources and the stable operation of the power grid are ensured. Through setting up the air distribution board in air intake one side for the air can fully exchange heat with heat storage subassembly, can improve holistic heat exchange quantity and the heat transfer ability of equipment.

Description

A metal phase change electric heat storage heat supply device

technical field

The invention relates to the technical field of energy storage equipment, in particular to a metal phase change electric heat storage and heat supply device.

Background technique

Electrothermal storage technology is a technology that converts electric energy into heat energy and stores it for utilization. It is an important means to solve the mismatch of time and space between the supply and demand of electric energy, realize the load shifting of the power grid, and improve the stability of the power system. From the perspective of energy storage costs, the cost of heat storage is much lower than that of electricity storage. Therefore, for electric energy whose ultimate path is heat utilization, energy storage through heat storage is a more economical way. The higher the heat storage temperature, the higher the grade of the stored heat energy and the higher its use value. Therefore, high-temperature heat storage technology is the focus of the development of electric heat storage technology.

At present, high-temperature heat storage technology generally refers to heat storage technology with an operating temperature above 300°C. In the prior art, high-temperature physical heat storage equipment mostly uses magnesia bricks, concrete, etc. as heat storage materials, but due to the low thermal conductivity of sensible heat storage materials such as magnesia bricks, concrete, etc. In application, the heating process of the equipment is slow, the heat storage is less, the heat release capacity is poor, and the equipment is bulky.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor thermal performance of the high-temperature physical heat storage equipment in the prior art, so as to provide a metal phase change electric heat storage heat supply device.

In order to solve the above technical problems, the present invention provides a metal phase change electric heat storage and heating device, including:

A housing, a support assembly is installed at the bottom of the housing, and an air inlet and an air outlet are respectively provided on opposite sides of the housing;

The heat storage assembly is arranged in the casing, the heat storage assembly is arranged on the upper side of the support assembly, the heat storage assembly includes heating units and heat storage units arranged alternately along the height direction, and the heat storage unit includes a plurality of heat storage modules arranged in an array, The heat storage module is provided with a housing cavity for containing the metal phase change material, and a ventilation channel is reserved between the heat storage modules;

The air distribution plate is uniformly provided with a plurality of through holes, and the air distribution plate is arranged between the air inlet and the heat storage component.

Optionally, it also includes a heat exchange component, which is arranged on the side of the housing where the air outlet is provided, the heat exchange component is arranged between the air outlet and the heat storage component, and the heat exchange component is provided with a liquid inlet and a liquid outlet, The liquid inlet and the liquid outlet are arranged through the shell, the liquid inlet is used for passing in the heat exchange fluid, and the liquid outlet is used for outputting the heat exchange fluid.

Optionally, the heat exchange assembly is a coil structure extending along the height direction of the heat storage assembly, and heat absorption fins are arranged on the pipeline of the heat exchange assembly, and the heat absorption fins are perpendicular to the axis of the pipeline of the heat exchange assembly.

Optionally, a plurality of heat conducting fins are extended on the outer wall of the heat storage module toward a direction away from the heat storage module.

Optionally, the heat conduction fins between adjacent heat storage modules are arranged in a staggered manner.

Optionally, heat conduction holes are provided on the heat conduction fins.

Optionally, the heating unit includes a plurality of heating fins arranged at intervals and a heating rod arranged through the heating fins.

Optionally, the heating fins and the heat conduction fins are perpendicular to each other.

Optionally, the support assembly is provided with a plurality of intersecting first air ducts, the plurality of first air ducts divide the support assembly into several support units, and the upper side of the support unit is provided with several second air ducts intersecting, and the second air ducts The depth of the channel is smaller than that of the first air channel, and the air inlet is arranged towards the supporting component.

Optionally, a base is installed at the bottom of the housing, and a heat insulation pad is provided between the base and the housing.

The technical solution of the present invention has the following advantages:

1. The metal phase change electric heat storage heat supply device provided by the present invention includes: a housing, a support assembly is installed at the bottom of the housing, and an air inlet and an air outlet are respectively provided on the opposite sides of the housing; the heat storage assembly is provided with In the casing, the heat storage assembly is arranged on the upper side of the support assembly. The heat storage assembly includes heating units and heat storage units arranged alternately along the height direction. The heat storage unit includes a plurality of heat storage modules arranged in an array. The heat storage modules are equipped with There is an accommodation cavity for accommodating metal phase change materials, and ventilation channels are reserved between heat storage modules; air distribution plate, with multiple through holes evenly arranged on the air distribution plate, and the air distribution plate is located between the air inlet and the heat storage between components.

When the power consumption is low, the heating unit is energized, and the heating power supply converts the electric energy into heat energy and stores it in multiple heat storage modules. When heat is needed, the air is passed into the air inlet of the ventilation component, and the air enters the ventilation flow channel. Exchange heat with the heat storage module, take out the heat in the heat storage module, and the heated high-temperature air can be used by users after flowing out from the air outlet. During the peak period of electricity consumption, the pre-stored heat energy can be used for production and life, or the heated air can be directly used to heat water to generate high-temperature and high-pressure water vapor, which can be used to drive the steam turbine to generate electricity, and the electric energy can be fed back to the grid to realize the realization of electric power. Cut peaks and fill valleys to ensure the full and rational use of resources and the stable operation of the power grid. By setting the air distribution plate on the side of the air inlet, the air entering from the air inlet can pass through the air distribution plate, rise first and then enter the ventilation channels of the heat storage components of each layer through the through holes, so that the air can be separated from different The heat storage module of the upper layer performs heat exchange, which makes the distribution of low-temperature air in the heat storage component more uniform, so that the air can fully exchange heat with the heat storage component, which can improve the overall heat transfer capacity of the equipment and improve the heat transfer capacity.

2. The metal phase change electric heat storage heat supply device provided by the present invention also includes a heat exchange component, which is arranged on the side where the air outlet is provided in the housing, and the heat exchange component is arranged between the air outlet and the heat storage component, and the heat exchange The component is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are arranged through the shell, the liquid inlet is used for passing in the heat exchange fluid, and the liquid outlet is used for outputting the heat exchange fluid. Add heat exchange components, use air to exchange heat and use heat exchange fluid as heat exchange medium to output hot liquid heat exchange medium or directly output steam for use by users or directly to drive steam turbines to generate electricity. Reduce the intermediate heat exchange process and reduce energy loss.

3. In the metal phase change electric heat storage and heat supply device provided by the present invention, a plurality of heat conducting fins are extended on the outer wall of the heat storage module toward a direction away from the heat storage module. By setting heat conduction fins on the outside of the heat storage module, the heat generated by the phase change process of the metal phase change material in the heat storage module is transferred to the ventilation flow channel through the heat conduction fins, and the air moves in the ventilation flow channel and exchanges with the heat conduction fins. It can increase the heat exchange area, increase the heat exchange capacity, accelerate the heat exchange efficiency, and accelerate the temperature rise rate of the output air.

4. In the metal phase change electric heat storage and heat supply device provided by the present invention, the heat conduction fins are provided with heat conduction holes. The heat conduction holes are all arranged in the ventilation channel outside the housing cavity, which can increase the disturbance of the air circulating in the ventilation channel and achieve the purpose of enhancing heat exchange.

5. In the metal phase change electric heat storage and heat supply device provided by the present invention, the support assembly is provided with a plurality of intersecting first air ducts, and the plurality of first air ducts divide the support assembly into several support units, and the upper side of the support unit A plurality of second air passages are intersected, the depth of the second air passages is smaller than that of the first air passages, the air inlets are arranged towards the support assembly, and the first air passages are aligned with the ventilation flow passages. The air entering from the air inlet flows in the first air channel, and can further rise, and then enters the ventilation flow channel, and fully exchanges heat with the heat conduction fins, and the first air channel is connected by setting the second air channel, The air can fill the first air channel and enter the second air channel to be evenly distributed to the lower side of the entire heat storage assembly, thereby enhancing the heat exchange effect of the bottom heat storage unit.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of a metal phase change electric heat storage and heat supply device provided in an embodiment of the present invention.

Fig. 2 is a structural schematic diagram of the cooperating installation of the support assembly and the heat storage assembly provided in the embodiment of the present invention.

Fig. 3 is a structural schematic diagram of another angle in which the support assembly and the heat storage assembly are installed in cooperation with each other according to the embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a heating unit provided in an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a support assembly provided in an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a heat exchange assembly provided in an embodiment of the present invention.

Fig. 7 is a schematic structural view of the installation of the heat storage module provided in the embodiment of the present invention in cooperation with the heat conduction fins.

Fig. 8 is a schematic diagram of the arrangement of heat conduction fins between adjacent heat storage modules provided in the embodiment of the present invention.

Fig. 9 is a front view of the thermal storage module provided in the embodiment of the present invention.

Fig. 10 is a schematic structural view of the heat storage module and the cover plate provided in the embodiment of the present invention.

Explanation of reference signs: 1. shell; 2. side cover; 3. base; 4. heat insulation pad; 5. support assembly; 6. heat storage module; 7. cover plate; 10. Heating rod; 11. Heating fin; 12. First air duct; 13. Second air duct; 14. Air inlet; 15. Air outlet; 16. Air distribution plate; 17. Heat exchange component; 18. Heat-absorbing fin plate; 19. Liquid inlet; 20. Liquid outlet.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

As shown in FIG. 1 to FIG. 10 , a metal phase change electric heat storage and heat supply device provided in this embodiment includes: a housing 1 , a heat storage component and a heat exchange component 17 . The heat storage component is arranged in the inner cavity of the casing 1 . In this embodiment, the housing 1 is selected as a rectangular parallelepiped, and the outer corners of the housing 1 are provided with rounded transitions. The shape of the shell 1 can also be cylindrical, conical, cubic, octahedron, etc. The shape of the shell 1 can be changed according to the actual use environment or use requirements.

A side cover 2 is provided on the side of the housing 1 to facilitate the installation, maintenance and replacement of various components in the housing 1 . A base 3 is provided on the bottom of the housing 1 , and a heat insulating pad 4 is provided on the upper side of the base 3 . A support plate as a support assembly 5 is provided at the bottom of the inner cavity of the housing 1, and the support plate is made of high temperature resistant magnesia bricks. The heat insulation pad 4 isolates the base 3 from the supporting component 5, preventing the heat energy stored in the heat storage component from being lost from the base 3 at the bottom. An air inlet 14 and an air outlet 15 are respectively provided on opposite sides of the housing 1 , the air inlet 14 is arranged below the right side of the housing 1 , and the air inlet 14 is aligned with the support assembly 5 .

The heat storage assembly is installed in the casing 1, and the heat storage assembly is arranged on the upper side of the support assembly 5. The heat storage assembly includes heating units and heat storage units arranged alternately along the height direction. heat unit. The heat storage unit includes a plurality of heat storage modules 6 arranged in a rectangular array or a circular array, and the heat storage modules 6 in this embodiment adopt a rectangular array. The thermal storage module 6 is provided with an accommodation chamber for accommodating metal phase change materials. The thermal storage module 6 is made of a metal whose melting point is much higher than that of the contained metal phase change material. An anti-corrosion coating is applied in the accommodating chamber to reduce the corrosion of the inner wall of the thermal storage module 6 by the metal phase change material contained inside. The opening of the accommodation cavity faces upward, and a cover plate 7 is arranged at the opening of the accommodation cavity. The cover plate 7 cooperates with the heat storage module 6 to completely close the accommodation cavity, so as to prevent the metal phase change material from flowing out of the accommodation cavity. A ventilation channel is reserved between adjacent thermal storage modules 6 . Metal phase change materials used for heat storage include aluminum and aluminum-based, germanium-based, magnesium-based, zinc-based and nickel-based alloys. In this embodiment, silicon-aluminum alloy is selected as the metal phase-change material, and the heat storage module 6 is made of stainless steel. . A plurality of heat conduction fins 8 are extended on the outer wall of the heat storage module 6 toward a direction away from the heat storage module 6 . In this embodiment, heat conduction fins 8 are arranged on both sides of the heat storage module 6 along the length direction, and the heat conduction fins 8 are arranged horizontally. Fin 8. The heat conduction fins 8 on two adjacent heat storage modules 6 are arranged in a staggered manner, and a plurality of heat conduction holes 9 are evenly arranged on each heat conduction fin 8, which further increases the disturbance of the convective air and enhances the heat exchange efficiency . The heating unit includes a plurality of heating fins 11 arranged at intervals and a heating rod 10 arranged through the heating fins 11, and the heating fins 11 are vertically arranged with the heating rod 10, so that the heating fins 11 can fully absorb the heat on the heating rod 10 It is derived that, in the heat storage assembly, the heating fins 11 are respectively in contact with the upper and lower layers of the heat storage modules 6 to achieve good heat conduction. The length direction of the heating rod 10 is arranged along the width direction of the heat storage unit. The two ends of the heating rod 10 protrude from both sides of the heat storage unit, so that the two ends of the heating rod 10 can communicate with the external power supply, and at the same time, the connecting terminals between the heating rod 10 and the power supply are hidden inside the housing 1, ensuring that the device electricity safety.

The support assembly 5 is provided with a plurality of intersecting first air passages 12, the support assembly 5 is divided into several support units by the plurality of first air passages 12, and a plurality of second air passages 13 are intersected on the upper side of the support unit. The depth of the air duct 13 is smaller than the depth of the first air duct 12 , the width of the second air duct 13 is smaller than the depth of the first air duct 12 , and the air inlet 14 is arranged toward the support assembly 5 . The ventilation channel between the first air channel 12 and the heat storage module 6 is aligned up and down. A plurality of first air passages 12 are arranged along the length direction and the width direction of the support assembly 5 and intersect with each other, and the intersecting first air passages 12 are all perpendicular to each other. By setting the second air duct 13, the low-temperature air can be blown into the bottom of the heat storage unit at the bottom layer, thereby enhancing the heat exchange capacity of the heat storage unit at the bottom layer.

An air distribution plate 16 is arranged between the air inlet 14 and the heat storage assembly, and a plurality of through holes are uniformly arranged on the air distribution plate 16 . The fan blows low-temperature air into the casing 1 from the air inlet 14, and the low-temperature air rises through the blocking of the air distribution plate 16, and passes through the through holes at different heights, and then enters the ventilation channels at different heights, so that the air close to All the heat storage modules 6 on the side of the air inlet 14 can fully exchange heat with the low-temperature air. By setting a smaller air inlet 14, the flow velocity of the low-temperature air entering the air inlet 14 can be accelerated, and the low-temperature air and heat conduction fins can be enlarged. 8, and at the same time increase the disturbance of the low-temperature air itself, and strengthen the heat transfer effect.

The heat exchange assembly 17 is arranged on the side of the casing 1 where the air outlet 15 is provided, the heat exchange assembly 17 is arranged between the air outlet 15 and the heat storage assembly, and the heat exchange assembly 17 is provided with a liquid inlet 19 and a liquid outlet 20. The liquid inlet 19 and the liquid outlet 20 pass through the casing 1 and extend to the outside of the casing 1. The liquid inlet 19 is used for passing in the heat exchange fluid, and the liquid outlet 20 is used for outputting the heat exchange fluid. In this embodiment, clean water is selected as the heat exchange fluid. The heat exchange component 17 is a coil structure extending along the height direction of the heat storage component. The pipeline of the heat exchange component 17 is provided with a heat absorbing fin 18 , and the heat absorbing fin 18 is perpendicular to the axis of the pipeline of the heat exchange component 17 .

During the heating process, the heat generated by the heating rod 10 is conducted through the heating fins 11 to the shell of the heat storage module 6 filled with metal phase change materials, and then the heat is conducted into the heat storage module 6 through the shell of the heat storage module 6. Inside the metal phase change material. During the heating process, the metal phase change material close to the shell will melt first, and then the melting zone will continue to expand to form convective heat transfer.

During the heat release process, the fan is turned on, and the low-temperature air is blown into the casing 1 from the air inlet 14 on the lower right side of the casing 1. After passing through the air distribution plate 16, the low-temperature air is evenly distributed in the height direction, and then passes through the ventilation The hole enters the ventilation channel between the thermal storage modules 6 and flows in the ventilation channel between the thermal storage modules 6 of the heat storage body. The surface of the module 6 is in full contact with the heat exchange, and the heated air flows out from the air outlet 15 on the upper left side of the casing 1 . A heat exchange assembly 17 is provided on the side close to the air outlet 15, and the heated air exchanges heat with the heat-absorbing fins on the surface of the heat exchange assembly 17 to heat the water inside the pipeline of the heat exchange assembly 17 to form High temperature water or steam. Therefore, the device can provide both hot air and hot water or high-temperature and high-pressure steam.

The heat storage component includes heating units and heat storage units arranged alternately along the height direction, and the heat storage component is designed into a modular structure to facilitate mass production. Both heat storage unit and heating unit can be increased or decreased according to different design requirements, and it is easy to realize the scaling design of heat storage power. At the same time, the heat storage unit is assembled from multiple heat storage modules 6. After a long period of use, if some heat storage modules 6 are severely corroded or leaked, the heat storage modules 6 can be replaced separately. device, which can greatly reduce equipment maintenance costs and system security risks.

Utilizing the metal phase change electric heat storage heating device provided in this embodiment, when the power consumption is low, the heating unit is energized, and the power supply converts the electric energy into heat energy and stores it in a plurality of heat storage modules 6. The air inlet 14 of the ventilation assembly leads to air, and the air enters into the ventilation channel to exchange heat with the heat storage module 6, and the heat in the heat storage module 6 is taken out, and the heated high-temperature air flows out from the air outlet 15 and can be used by users. During the peak period of electricity consumption, air is passed into the air inlet 14, or water is passed into the liquid inlet 19 of the heat exchange component 17 at the same time, so that the pre-stored heat energy can be used for production and life, or the heat can be directly used after heating. The air is used to heat water to generate high-temperature and high-pressure water vapor, which is used to drive steam turbines to generate electricity, and the electric energy is fed back to the grid to realize peak-shaving and valley-filling of electricity, ensuring full and reasonable use of resources and stable operation of the grid. Heat storage during low power consumption, thermal power generation during peak power consumption, to achieve two-way regulation of the power grid. The combination of multiple metal phase-change electric heat storage and heating devices can realize large energy storage. When the electricity consumption is low, the device can be used to convert cheap electric energy into high-grade heat energy and store it. During the peak period of electricity consumption, the high-temperature gas output by the device is used to heat water to generate high-temperature and high-pressure steam, thereby driving the steam turbine to generate electricity, and the generated electric energy is fed back to the power grid, thereby realizing peak-shaving and valley-filling of electric power, ensuring full utilization of resources and stable operation of the grid.

It can also be used to generate high-temperature and high-pressure steam for industrial processes such as drying or for building heating and hot water supply. It can also replace traditional coal-fired heating stoves or natural gas wall-hung boilers, use off-peak electricity to store heat at night, and then use it for hot water supply and heating throughout the day. Using the heat storage device to heat and provide hot water, compared with direct electric heating and electric water heaters, the use of peak-valley electricity price differences can significantly reduce heat costs.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (11)

1. A metal phase change electric heat storage heat supply device, characterized in that it comprises: A housing (1), a support assembly (5) is installed at the bottom of the housing (1), and an air inlet (14) and an air outlet (15) are respectively provided on opposite sides of the housing (1); The heat storage assembly is arranged in the housing (1), the heat storage assembly is arranged on the upper side of the support assembly (5), and the heat storage assembly includes heating units and heat storage units arranged alternately along the height direction , the heat storage unit includes a plurality of heat storage modules (6) arranged in an array, and the heat storage module (6) is provided with an accommodation chamber for containing metal phase change materials, and the heat storage module (6) Ventilation passages are reserved between them, and the support assembly (5) is provided with a plurality of first air passages (12) intersecting each other, and the plurality of first air passages (12) connect the support assembly (5 ) is divided into several support units, and the upper side of the support unit is provided with several second air passages (13), the depth of the second air passage (13) is smaller than the depth of the first air passage (12), so The air inlet (14) is set towards the support assembly (5); the air distribution plate (16), the air distribution plate (16) is uniformly provided with a plurality of through holes, and the air distribution plate (16) is located on Between the air inlet (14) and the heat storage component. 2. The metal phase change electric heat storage and heat supply device according to claim 1, characterized in that it also includes a heat exchange component (17), and the air outlet (15) is provided in the housing (1) ), the heat exchange assembly (17) is located between the air outlet (15) and the heat storage assembly, and the heat exchange assembly (17) is provided with a liquid inlet (19) and an outlet A liquid port (20), the liquid inlet (19) and the liquid outlet (20) are provided through the housing (1), and the liquid inlet (19) is used to pass through the heat exchange fluid, so The liquid outlet (20) is used for outputting heat exchange fluid. 3. The metal phase change electric heat storage heat supply device according to claim 2, characterized in that, the heat exchange component (17) is a coil structure extending along the height direction of the heat storage component, and the heat exchange A heat absorbing fin (18) is arranged on the pipeline of the component (17), and the heat absorbing fin (18) is perpendicular to the axis of the pipeline of the heat exchange component (17). 4. The metal phase change electric heat storage and heat supply device according to any one of claims 1 to 3, characterized in that, the outer wall of the heat storage module (6) faces away from the heat storage module (6). A plurality of heat conducting fins (8) are provided extending in the direction. 5. The metal phase change electric heat storage and heat supply device according to claim 4, characterized in that the heat conducting fins (8) between adjacent heat storage modules (6) are arranged in a staggered manner. 6. The metal phase change electric heat storage and heat supply device according to claim 4, characterized in that, the heat conduction fins (8) are provided with heat conduction holes (9). 7. The metal phase change electric heat storage and heat supply device according to claim 4, characterized in that the heating unit includes a plurality of heating fins (11) arranged at intervals, and the heating fins (11) are arranged heating rod (10). 8. The metal phase change electric heat storage and heat supply device according to claim 5 or 6, characterized in that the heating unit includes a plurality of heating fins (11) arranged at intervals and ) set the heating rod (10). 9. The metal phase change electric heat storage and heat supply device according to claim 7, characterized in that the heating fins (11) and the heat conducting fins (8) are perpendicular to each other. 10. The metal phase change electric heat storage and heat supply device according to claim 8, characterized in that the heating fins (11) and the heat conducting fins (8) are perpendicular to each other. 11. The metal phase change electric heat storage and heat supply device according to any one of claims 1 to 3, characterized in that a base (3) is installed on the bottom of the housing (1), and the base (3 ) and the housing (1) are provided with a heat insulating pad (4).

Images