A heat pipe phase change heat storage heating device based on direct electric heating

Abstract

The present invention is a heat pipe type phase change heat storage heating device based on direct electric heating. It includes a phase change heat storage unit, a heat pipe flow channel, an enhanced heat transfer fin, an electric heating plate, and structural assembly accessories such as rolling pulleys, support columns, and connecting columns. The heat pipe is arranged between the phase change heat storage units, and an enhanced heat transfer fin structure is added on the side of the phase change heat storage material to enhance the heat transfer performance of the phase change heat storage side. The electric heating plate is arranged in the evaporation section at the bottom of the heat pipe. The outer side of the heat storage device is in direct contact with the air. The support columns are located on both sides of the device, the rolling pulley is located below the support column, and the connecting column is located between the two phase change heat storage units. The present invention adopts a modular design to combine the phase change heat storage units into a cluster system, which is convenient for expansion and group management, and realizes flexible adjustment of the heat storage and heating capacity. Through the coupling design of electric heating, heat pipes and phase change heat storage devices, an indoor phase change heat storage heating integrated solution without a circulation pipeline is realized, solving the problem of compact heat storage heating equipment on the building side.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and in particular relates to a heat pipe type phase change heat storage and heating device based on direct electric heating. Background Art

[0002] Phase change heat storage has a high energy storage density and a constant phase change temperature. Phase change materials store and release energy by phase change. Most current phase change heat storage devices are heat storage and heating structures based on medium circulation charging and releasing heat. They have complex charging and releasing circuits, and phase change heat storage devices have the problem of poor scalability of heat storage capacity. Chinese invention patent CN104613799A provides a natural convection radiator with plate-type micro heat pipes. The plate-type micro heat pipes of the device are connected to the wall panels to form a convection channel with a closed periphery and connected up and down. The plate-type micro heat pipes and the heat source belts are placed crosswise. The heat of the heat source belts quickly heats the air in the convection channel through the plate-type micro heat pipes to form natural convection. Its air circulation loop is relatively complex, and the heat storage structure is not conducive to system expansion and customized integration in multiple scenarios. Chinese invention patent CN109974066A provides a low-temperature phase-change energy storage electric heater. The device is an integral container with heat-conducting ribs, which encapsulates phase-change materials inside and heats the phase-change materials in the container through a heating plate. However, this structure cannot manage the heat release process and is not conducive to capacity expansion. In order to simplify and modularize the design of phase-change heat storage and heat release radiator systems, the present invention proposes a direct electric heating heat pipe phase-change heat storage heating device. Based on heat pipe electric heating and external radiation heat exchange mode, it realizes passive medium circulation heating and heat release mode, simplifies the management of the heat charging and discharging system, and at the same time, its standardized unit module design method breaks through the flexible integrated design of systems that are suitable for storage and heating capacity. Summary of the invention

[0003] The purpose of the present invention is to better control the temperature of the heat pipe, overcome the problems of complex charging and discharging circuit structure of the traditional phase change heat storage heating system, and poor flexible adjustment ability of the capacity and power of the heat storage system, and propose a heat pipe phase change heat storage heating device based on direct electric heating.

[0004] The present invention adopts a modular heat storage structure design, a heat pipe phase change heat storage heating device with direct electric heating, and a coupling design of electric heating, heat pipe and phase change heat storage device to realize an indoor phase change heat storage heating integrated solution without a circulation pipeline, solving the problem of compact heat storage heating equipment on the building side. At the same time, the modular heat storage and discharge mode without charging and discharging heat pipe connection also expands the capacity of the heat storage unit, and manages the heat charging process in groups, so as to realize flexible adjustment of heat storage capacity and charging power. The heat storage system can select suitable phase change materials according to different required scenarios, which can meet the specific temperature that needs to be controlled, and install enhanced heat transfer fins in the phase change heat storage unit to better enable the phase change material in the phase change heat storage unit to absorb or release heat.

[0005] To achieve the above object, the present invention is achieved through the following technical solutions:

[0006] A heat pipe type phase change heat storage and heating device based on direct electric heating comprises a phase change heat storage unit, a heat pipe flow channel, an enhanced heat transfer fin, an electric heating plate, a support column, a rolling pulley and a connecting column; two of the phase change heat storage units are connected into a single structure through an inverted T-shaped heat pipe flow channel, the heat pipe flow channel is arranged between the two phase change heat storage units, a phase change heat storage material is encapsulated inside the phase change heat storage unit, and additional enhanced heat transfer fins are arranged on the sides of the inverted T-shaped heat pipe flow channel inside the two phase change heat storage units, the enhanced heat transfer fins are tightly attached to the inverted T-shaped heat pipe flow channel inside the two phase change heat storage units, and keep a certain distance from the side away from the heat pipe flow channel, and the electric heating plate is arranged at the bottom of the heat pipe flow channel; the phase change heat storage and heating device is formed by a plurality of the single structures, the support columns are located on both sides of the phase change heat storage and heating device, the rolling pulley is located below the support columns, and the connecting column is located between two adjacent single structures.

[0007] Furthermore, during the heat charging process, the electric heating plate is energized and heats the heat transfer medium inside the heat pipe flow channel. After evaporation, the heat transfer medium rises and exchanges heat with the phase change heat storage material in the phase change heat storage unit. The heat transfer medium condenses and returns to the bottom of the heat pipe flow channel, forming a passive closed cycle. At the same time, the phase change heat storage unit releases heat to the surrounding air. When in the non-heat charging state, the phase change heat storage material in the phase change heat storage unit maintains the temperature for a long time through phase change, thereby providing heat to the surrounding environment.

[0008] Furthermore, the electric heating plate has a built-in over-temperature protection device, which promptly cuts off the power to the electric heating plate when the heat pipe fails or the phase change heat storage unit is overcharged and overheats.

[0009] Furthermore, according to the demand for heating amount and heating power, a plurality of single structures are combined to form a module to meet the needs of different heating scenarios. The single structures are connected and fastened by connecting columns, and gaps are left to ensure that the phase change heat storage unit releases heat outward. The electric heating plate is arranged at the bottom of the heat pipe flow channel of each single structure, and the start and stop of each electric heating plate is independently grouped or uniformly controlled in combination with the power supply capacity and heating power.

[0010] Furthermore, when multiple single structures are combined, they are integrated as a whole using special-shaped heat pipes, and multiple single structures use the same electric heating plate. At this time, each single structure is connected into an integrated module to perform charging and discharging heat management.

[0011] Furthermore, while the electric heating plate heats the heat pipe flow channel, the phase change heat storage unit absorbs and releases heat better by strengthening the heat transfer fins.

[0012] Furthermore, a plurality of groups of enhanced heat transfer fins are installed in the phase change heat storage unit.

[0013] Furthermore, the phase-change heat storage heating device adopts an integrated heat storage structure or a block heat storage structure;

[0014] Modular expansion is carried out in combination with the demand for heating amount, the arrangement of the single structure is increased, and the capacity of the phase change heat storage heating device is expanded.

[0015] The advantages of the present invention are:

[0016] 1. The phase change heat storage device is an overall structural design, such as the charging and discharging heat exchange pipelines, which can move freely. Phase change materials with different phase change points are encapsulated according to different scenarios to meet the heating needs of different scenarios.

[0017] 2. The phase change heat storage device adopts a block heat storage structure design, which can be modularly expanded according to the heating demand, so that the heat storage capacity of the device has good scalability. At the same time, the charging power can be adjusted by turning on the number of electric heating plates to adapt to the changes in the grid load and ensure the safety of electricity use.

[0018] 3. Phase change heat storage device uses phase change heat storage material as the heat storage medium, which has good isothermal heat release characteristics, ensuring that the temperature of the outer surface of the heat storage device maintains a stable temperature difference with the environment, achieving stable heat supply, and avoiding unstable heat release caused by temperature changes of heat storage materials based on sensible heat supply.

[0019] 4. Add enhanced heat transfer fins in the phase change heat storage unit to better enable the phase change material in the phase change heat storage unit to absorb or release heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a single structural schematic diagram of a heat pipe type phase change heat storage and heating device based on direct electric heating of the present invention.

[0021] Figure 2 It is a block structure schematic diagram of a heat pipe type phase change heat storage and heating device based on direct electric heating of the present invention.

[0022] Figure 3 It is a schematic diagram of the integrated structure of a heat pipe type phase change heat storage and heating device based on direct electric heating of the present invention.

[0023] Figure 4 It is a schematic diagram of block-type fluid flow in a heat pipe type phase change heat storage and heating device based on direct electric heating of the present invention.

[0024] Figure 5 It is a schematic diagram of an integrated fluid flow of a heat pipe type phase change heat storage and heating device based on direct electric heating of the present invention.

[0025] In the figure: 1 phase change heat storage unit; 2 heat pipe flow channel; 3 enhanced heat transfer fins; 4 electric heating plate; 5 support column; 6 rolling pulley; 7 connection column. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] The present invention is a heat pipe type phase change heat storage and heating device based on direct electric heating, which is a phase change heat storage device combined with an electric heating plate. The operation of the device includes a heat storage stage and a heat release stage. The specific implementation method is as follows.

[0028] like Figure 1As shown, the single structure of the heat pipe phase change heat storage heating device based on direct electric heating of the present invention mainly includes a phase change heat storage unit 1, a heat pipe flow channel 2, enhanced heat transfer fins 3, and an electric heating plate 4. According to the specific usage scenario, a modular heat storage structure design is adopted, and every two phase change heat storage units 1 are grouped together, and an inverted T-shaped heat pipe flow channel 2 is set to connect them into a whole, making a standardized module, that is, a single structure, and then modular expansion is carried out in combination with the demand for heat supply, increasing the arrangement of phase change heat storage units, and expanding the capacity of the phase change heat storage device. The phase change heat storage unit 1 is made of a phase change energy storage material encapsulated in a metal plate container, and multiple groups of enhanced heat transfer fins 3 are installed in the phase change heat storage unit 1, which is beneficial to increase the thermal conductivity in the heat exchange process and enhance the heat exchange performance of the heat transfer fluid and the phase change heat storage material. The heat pipe flow channel 2 is arranged between the phase change heat storage units 1, and an enhanced heat transfer fin 3 is arranged inside the two phase change heat storage units 1 near the inverted T-shaped heat pipe flow channel 2. The heat pipe flow channel 2 is close to the inverted T-shaped heat pipe flow channel 2 inside the two phase change heat storage units 1, and a certain distance is maintained from the outside thereof. The electric heating plate 4 has a built-in over-temperature protection device. When the heat pipe fails or the phase change heat storage unit 1 is overcharged and causes overheating, the electric heating plate 4 is powered off in time to protect the safety of the equipment. The enhanced heat transfer fin 3 is bonded to the wall of the phase change heat storage unit 1 by welding, and is formed by extrusion or stamping of an aluminum alloy profile.

[0029] like Figure 2 ,4, the heat pipe type phase change heat storage and heating device based on direct electric heating of the present invention is composed of multiple Figure 1 The single structure shown constitutes a module assembly, and also includes a support column 5, a rolling pulley 6, and a connecting column 7. The electric heating plate 4 is arranged at the bottom of the heat pipe flow channel 2 of each single structure, the support column 5 is located on both sides of the phase change heat storage heating device, and the rolling pulley 6 is located below the support column 5 and can be retracted into the support column 5. The connecting column 7 is located between the two single structures to ensure the overall stability and mobility of the device.

[0030] The present invention can be flexibly combined with multiple single structures according to the requirements of heat supply and heating power. The connecting column 7 is two upper and lower ones, which increases the stability of the device. The individual structures must be connected and tightened, and a gap must be left to ensure that the phase change heat storage unit 1 releases heat outward. The start and stop of the electric heating plate 4 of each individual structure can be independently grouped or uniformly controlled in combination with power supply capacity, heating power, etc.

[0031] like Figure 3 As shown in FIG5 , the electric heating plate 4 is integrally arranged at the bottom of the heat pipe flow channel 2 , the support column 5 is fixed on both sides of the phase change heat storage and heating device, and the rolling pulley 6 is placed under the support column 5 and can be retracted into the support column 5 .

[0032] like Figure 4As shown in Figure 5, during the heat charging process, the electric heating plate 4 is energized and heats the heat transfer medium inside the heat pipe flow channel 2. After evaporation, the heat transfer medium rises and exchanges heat with the heat storage material in the phase change heat storage unit 1. The heat transfer medium condenses and returns to the bottom of the heat pipe flow channel 2, forming a passive closed cycle. At the same time, the phase change heat storage unit 1 releases heat to the surrounding air. When it is not in the heat charging state, the phase change heat storage material in the phase change heat storage unit 1 can maintain the temperature for a long time through phase change, thereby providing heat to the surrounding environment.

[0033] When the present invention adopts a block-type heat storage structure design, such as Figure 2 As shown in Figure 4, different single structures are used according to specific usage scenarios, and modular expansion is carried out in combination with the demand for heat supply. The arrangement of single structures is increased to expand the capacity of the phase change heat storage heating device. The process is simple to manufacture and can be easily made into standard modules for easy expansion. During the charging and discharging process, the multiple single structures in the module are grouped and switched according to the charging and discharging power requirements, and the phase change heat storage materials in the phase change heat storage unit 1 are opened in an orderly manner to release heat, thereby realizing block-type heat management of the phase change heat storage heating device.

[0034] When the present invention adopts an integrated heat storage structure design, such as Figure 3 ,5, the difference between it and the block-type heat storage structure is that the heat pipe flow channel 2 below the integrated heat storage structure is in a connected state, all the phase change heat storage units 1 provide heat together, and the electric heating plate 4 below covers the entire heat pipe flow channel 2. In the block-type heat storage structure, every two phase change heat storage units 1 form a single structure, and the bottom of the heat pipe flow channel 2 is separated by the phase change heat storage unit 1 of the adjacent single structure. The heat pipe flow channels 2 between the adjacent single structures also play the role of connecting columns 7, and the electric heating plate 4 is only placed at the bottom of the heat pipe flow channel 2 corresponding to the bottom of the single structure.

[0035] The fluid inside the phase-change heat storage heating device circulates, and there is no need to set up an inlet and outlet. The device is integrated, which makes it convenient for the mobile device to be used in different scenarios.

[0036] It should be noted that, according to the above-mentioned embodiments of the present invention, those skilled in the art can fully implement the full scope of the independent claims and dependent rights of the present invention, and the implementation process and method are the same as the above-mentioned embodiments; and the present invention does not elaborate on some of the well-known technologies in the field.

[0037] The above descriptions are only some specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person familiar with the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A heat pipe phase change heat storage and heating device based on direct electric heating, characterized in that: The invention comprises a phase change heat storage unit (1), a heat pipe flow channel (2), a heat transfer enhancing fin (3), an electric heating plate (4), a support column (5), a rolling pulley (6) and a connecting column (7); two phase change heat storage units (1) are connected into a single structure via an inverted T-shaped heat pipe flow channel (2); the heat pipe flow channel (2) is arranged between the two phase change heat storage units (1); a phase change heat storage material is encapsulated inside the phase change heat storage unit (1); and an enhanced heat transfer fin (3) is arranged on the side of the inverted T-shaped heat pipe flow channel (2) inside the two phase change heat storage units (1). The heat transfer fins (3) are arranged in close contact with the inverted T-shaped heat pipe flow channel (2) inside the two phase change heat storage units (1) and keep a certain distance from the side away from the heat pipe flow channel (2); the electric heating plate (4) is arranged at the bottom of the heat pipe flow channel (2); the phase change heat storage heating device is formed by a plurality of the single structures; the support column (5) is located on both sides of the phase change heat storage heating device; the rolling pulley (6) is located below the support column (5); and the connecting column (7) is located between two adjacent single structures.

2. A heat pipe type phase change heat storage and heating device based on direct electric heating according to claim 1, characterized in that: During the heat charging process, the electric heating plate (4) is energized and heats the heat transfer medium inside the heat pipe flow channel (2). After evaporation, the heat transfer medium rises and exchanges heat with the phase change heat storage material in the phase change heat storage unit (1). The heat transfer medium condenses and returns to the bottom of the heat pipe flow channel (2), forming a passive closed cycle. At the same time, the phase change heat storage unit (1) releases heat to the surrounding air. When not in the heat charging state, the phase change heat storage material in the phase change heat storage unit (1) maintains the temperature for a long time through phase change, thereby providing heat to the surrounding environment.

3. A heat pipe type phase change heat storage and heating device based on direct electric heating according to claim 1 or 2, characterized in that: The electric heating plate (4) has a built-in over-temperature protection device, which promptly cuts off the power to the electric heating plate (4) when the heat pipe fails or the phase change heat storage unit (1) is overcharged and causes overheating.

4. A heat pipe type phase change heat storage and heating device based on direct electric heating according to claim 1 or 2, characterized in that: According to the requirements of heat supply and heating power, a plurality of single structures are combined to form a module to meet the requirements of different heating scenarios. The single structures are connected and fastened by connecting columns (7) and gaps are left to ensure that the phase change heat storage unit (1) releases heat outward. The electric heating plate (4) is arranged at the bottom of the heat pipe flow channel (2) of each single structure. The start and stop of each electric heating plate (4) is independently grouped or uniformly controlled in combination with the power supply capacity and the heating power.

5. A heat pipe type phase change heat storage and heating device based on direct electric heating according to claim 4, characterized in that: When a plurality of the single structures are combined, they are integrated as a whole by using a special-shaped heat pipe, and the plurality of the single structures use the same electric heating plate (4). At this time, the individual structures are connected into an integrated module to perform heat management for charging and discharging.

6. A heat pipe type phase change heat storage and heating device based on direct electric heating according to claim 1 or 2, characterized in that: While the electric heating plate (4) heats the heat pipe flow channel (2), the phase change heat storage unit (1) absorbs and releases heat better by strengthening the heat transfer fins (3).

7. A heat pipe type phase change heat storage and heating device based on direct electric heating according to claim 6, characterized in that: A plurality of groups of enhanced heat transfer fins (3) are installed in the phase change heat storage unit (1).

8. The heat pipe type phase change heat storage and heating device based on direct electric heating according to claim 5, characterized in that: The phase-change heat storage heating device adopts an integrated heat storage structure or a block heat storage structure; modular expansion is performed in combination with the demand for heat supply, the arrangement of the single structure is increased, and the capacity of the phase-change heat storage heating device is expanded.

Images