Heterodromous pyrolytic graphite heat conduction and energy storage device

Abstract

The utility model discloses an incongruous pyrolytic graphite heat conduction energy storage device which comprises a shell, a heat conduction framework and a cover plate, the heat conduction framework is arranged in the shell and divides an inner cavity of the shell into a plurality of first containing cavities and a plurality of second containing cavities, the first containing cavities are filled with phase change materials, and the second containing cavities are filled with phase change materials. A pyrolytic graphite column is arranged in the second containing cavity, and the shell, the heat conduction framework and the cover plate are welded to form a sealed cavity. According to the utility model, the pyrolytic graphite column is assembled in the second accommodating cavity by utilizing the excellent heat-conducting property of pyrolytic graphite, and the heat is quickly transferred from the top of the shell to the bottom of the shell along the vertical direction by utilizing the plane direction as the heat-conducting direction, so that the normal heat transfer is enhanced, and the overall heat-conducting coefficient is improved; the phase-change material can fully absorb heat to generate phase change in the working time, the utilization rate of the phase-change material is increased, the temperature difference of the pyrolytic graphite heat-conducting energy storage device is reduced, and the pyrolytic graphite heat-conducting energy storage device has good temperature uniformity.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of phase change heat storage, more specifically, the utility model relates to a hetero pyrolysis graphite heat conduction energy storage device. BACKGROUND

[0002] The heat conduction energy storage device mainly realizes the heat dissipation effect of the missile-borne equipment through the phase change material, and in the working process, the phase change material changes phase at the set temperature, changes from solid to liquid, and is used for absorbing the heat generated by the heat source of the equipment, so that the temperature of the equipment is stable, but the phase change material has poor heat transfer performance, only part of the phase change material in the heat conduction energy storage device changes phase to play the heat absorption effect in the working time, the utilization rate of the phase change material is low, a large temperature difference appears in the heat conduction energy storage device, the temperature uniformity is poor, and finally the service life of the equipment is affected. SUMMARY

[0003] The utility model also has the purpose of providing a hetero pyrolysis graphite heat conduction energy storage device with good temperature uniformity and high phase change material utilization rate.

[0004] In order to realize these purposes and other advantages according to the utility model, a hetero pyrolysis graphite heat conduction energy storage device is provided, which comprises a shell, a heat conduction framework and a cover plate, the heat conduction framework is arranged in the shell and divides the inner cavity of the shell into a plurality of first accommodating cavities and a plurality of second accommodating cavities, the first accommodating cavities are filled with phase change materials, the second accommodating cavities are provided with pyrolytic graphite columns, and the shell, the heat conduction framework and the cover plate form a sealed cavity through welding.

[0005] Preferably, the pyrolytic graphite column is a columnar structure formed by stacking and pressing a plurality of pyrolytic graphite sheets.

[0006] Preferably, the thickness of the pyrolytic graphite sheet is 1mm.

[0007] Preferably, the second accommodating cavity is a square groove structure, and the pyrolytic graphite column is embedded in the square groove structure.

[0008] Preferably, the pyrolytic graphite column is embedded in the square groove structure through a graphite box, the graphite box comprises a U-shaped bottom plate, the pyrolytic graphite column is assembled in the U-shaped bottom plate, a top plate is vacuum welded at the opening of the U-shaped bottom plate, and the outer periphery of the top plate and the U-shaped bottom plate is in close contact with the inner periphery of the square groove structure.

[0009] The utility model discloses at least include following beneficial effect: the utility model discloses utilize the excellent heat conductivity of pyrolytic graphite, assemble pyrolytic graphite column in the second containing cavity, utilize the plane direction as the heat conduction direction, and the heat is along the vertical direction from the top of shell fast transmission to the bottom of shell, strengthens normal heat transfer, improves the overall thermal conductivity, makes the phase change material can be fully heat absorbed and phase change in the working time, improves the utilization rate of phase change material and reduces the temperature difference of pyrolytic graphite heat conduction energy storage device itself, has good isothermal, can avoid the situation of shell appearance superhigh temperature influence equipment service life, and because pyrolytic graphite column is the structure of pure solid, has good overload capacity, can keep stable heat conductivity under the multiattitude, therefore, under the scene of multiattitude application, the pyrolytic graphite heat conduction energy storage device of the application can equivalent replace the isothermal plate in adverse gravity, multiattitude, high overload etc.

[0010] The other advantages, objects and features of the utility model will be embodied partly through the following description, and will be understood by the person skilled in the art partly through the research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structure schematic view of the hetero pyrolytic graphite heat conduction energy storage device of one embodiment of the utility model;

[0012] Figure 2 It is a structure schematic view of the graphite box in the above embodiment;

[0013] DESCRIPTION OF THE DRAWINGS

[0014] 1, shell, 2, heat conduction framework, 3, first containing cavity, 4, second containing cavity, 5, pyrolytic graphite column, 6, pyrolytic graphite sheet, 7, bottom plate, 8, top plate. DETAILED DESCRIPTION

[0015] The utility model will be further explained in detail in combination with the drawings, so that the person skilled in the art can implement according to the description of the specification.

[0016] It should be noted that, in the description of the utility model, the orientation or positional relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0017] As Figure 1 , Figure 2As shown, the utility model provides a kind of pyrolytic graphite heat-conducting energy storage device, it is installed in the lower part of equipment heat source, pyrolytic graphite heat-conducting energy storage device includes shell 1, heat-conducting framework 2, cover plate, the heat-conducting framework 2 is arranged in the shell 1 and the shell inner cavity is divided into multiple first accommodating cavity 3 and multiple second accommodating cavity 4, the first accommodating cavity 3 is filled with phase change material, the second accommodating cavity 4 is provided with pyrolytic graphite column 5, the pyrolytic graphite column 5 is the columnar structure formed by the stacking of multilayer pyrolytic graphite sheet 6, the shell 1, the heat-conducting framework 2 and the cover plate are welded to form sealed cavity by vacuum brazing.

[0018] Generally, the thermal conductivity of phase change material is very low, only 0.2~0.3W / m / K, for the shell 1 setting thicker heat-conducting energy storage device, in the process of heat absorption, often after work, bottom phase change material has not melted, while top phase change material has melted, the filled phase change material is not effectively utilized, poor uniformity, there is very big temperature difference in shell 1, the highest temperature can exceed the required range, thereby leading to heat source temperature over-temperature, affect the service life of equipment;

[0019] Pyrolytic graphite is the planar stacking of hexagonal plane composed of carbon atoms, and its thermal conductivity in the planar stacking direction reaches 1200~1800W / (m·k), and its thermal conductivity in the vertical direction reaches 2~10W / (m·k). Therefore, in the above technical solution, for the shell 1 setting thicker heat-conducting energy storage device, the present application utilizes the excellent heat-conducting performance of pyrolytic graphite, assembles the columnar structure of multiple pieces of structure formed by the stacking of multilayer pyrolytic graphite sheet 6 in the second accommodating cavity 4, utilizes the planar direction as the heat-conducting direction, rapidly transfers heat from the top of shell 1 to the bottom of shell 1 along the vertical direction, strengthens the normal heat transfer, improves the overall thermal conductivity, thereby rapidly conducts heat into the whole interior of shell 1, and then absorbs heat through the internal phase change material, so that the phase change material can fully absorb heat and change phase within the working time, improves the utilization rate of phase change material, reduces the temperature difference of pyrolytic graphite heat-conducting energy storage device itself, has good uniformity, can avoid the case that the shell 1 appears over-temperature, and affects the service life of equipment. Moreover, since the pyrolytic graphite column 5 is a pure solid structure, it has good overload resistance, and can maintain stable heat conductivity in multiple postures. Therefore, in the scene of multiple postures application, the pyrolytic graphite heat-conducting energy storage device of the present application can be equivalent to replace the uniform plate in the scene of adverse gravity, multiple postures, high overload and other adverse steam cavity heat transfer.

[0020] In another technical solution, the thickness of the pyrolytic graphite sheet 6 is 1mm.

[0021] In the technical solution, the APG pyrolytic graphite is prepared by a chemical vapor deposition method, the thicker the layer is, the more difficult the process is, the poorer the graphite binding force is, the more difficult the flatness is to guarantee, and the higher the cost is; through multiple tests, it is found that the preparation process of the 1mm thick pyrolytic graphite sheet 6 is less difficult, the graphite binding force is good, the flatness during stacking can be guaranteed, the cost is low, and the pyrolytic graphite sheet 6 is suitable for batch preparation.

[0022] In another technical solution, the second accommodating cavity 4 is a square groove structure, and the pyrolytic graphite column 5 is inlaid in the square groove structure.

[0023] In another technical solution, the pyrolytic graphite column 5 is inlaid in the square groove structure through a graphite box, the graphite box comprises a U-shaped bottom plate 7, the pyrolytic graphite column 5 is assembled in the U-shaped bottom plate 7, a top plate 8 is vacuum welded at an opening of the U-shaped bottom plate 7, and the top plate 8 and the outer periphery of the U-shaped bottom plate 7 are in close contact with the inner periphery of the square groove structure.

[0024] In the technical solution, the U-shaped bottom plate 7, the top plate 8 and the pyrolytic graphite column 5 are welded into an integrated body through vacuum diffusion welding; the pyrolytic graphite column 5 can be conveniently assembled in the second accommodating cavity 4 through the graphite box, the pyrolytic graphite column 5 can be prepared into a universal structure in the mode of assembling the pyrolytic graphite column 5 through the graphite box, similar structure products can directly use the pyrolytic graphite column 5, and the applicability is strong; the shell 1, the heat conduction framework 2, the cover plate and the graphite box are all made of aluminum alloy materials.

[0025] The pyrolytic graphite heat conduction energy storage device is applied to a missile-borne antenna array heat storage scheme, has multiple postures and an anti-gravity scene, the missile-borne antenna array has 32 heat sources, one pyrolytic graphite heat conduction energy storage device is installed below each heat source, the heat consumption of each heat source is 56W, the continuous working time is 90s, in the condition that the environmental temperature is 70℃, the space is closed, and the natural heat dissipation and heat radiation are not considered, through measurement, the temperature of the heat source is not higher than 100℃, which is not higher than the required temperature, the phase change material utilization rate is high, the temperature uniformity is good, and the heat conduction efficiency is good.

[0026] Although the embodiments of the utility model have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, it can be completely applied to various fields suitable for the utility model, and other modifications can be easily realized by those skilled in the art, therefore, the utility model is not limited to specific details and the drawings shown and described herein under the general concept defined by the claims and the equivalent range.

Claims

1. An anisotropic pyrolytic graphite thermal energy storage device, characterized in that: It includes a shell, a heat-conducting skeleton, and a cover plate. The heat-conducting skeleton is arranged in the shell and divides the inner cavity of the shell into multiple first accommodating cavities and multiple second accommodating cavities. The first accommodating cavities are filled with phase change materials, and the second accommodating cavities are provided with pyrolytic graphite columns. The shell, the heat-conducting skeleton and the cover plate are welded to form a sealed cavity.

2. The anisotropic pyrolytic graphite heat conduction energy storage device according to claim 1, characterized in that: The pyrolytic graphite column is a columnar structure formed by stacking and pressing multiple layers of pyrolytic graphite sheets.

3. The anisotropic pyrolytic graphite heat conduction energy storage device according to claim 2, characterized in that: The thickness of the pyrolytic graphite sheet is 1 mm.

4. The anisotropic pyrolytic graphite heat conduction energy storage device according to claim 1, characterized in that: The second accommodating cavity is a square groove structure, and the pyrolytic graphite column is embedded in the square groove structure.

5. The anisotropic pyrolytic graphite heat conduction energy storage device according to claim 4, characterized in that: The pyrolytic graphite column is embedded in the square groove structure through a graphite box. The graphite box includes a U-shaped bottom plate. The pyrolytic graphite column is assembled in the U-shaped bottom plate. A top plate is vacuum welded at the opening of the U-shaped bottom plate. The outer periphery of the top plate and the U-shaped bottom plate is in close contact with the inner periphery of the square groove structure.

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