Heat pipe structure

Abstract

The present invention provides a heat pipe structure comprising: a tube body, a plurality of capillary structures, and a working fluid; the tube body having an airtight chamber; the plurality of capillary structures being layered from the outside inwardly by grooves, a grid body, and sintered powder; the plurality of grooves having an open side and a closed side, the open side being narrower than the closed side; the working fluid filling the airtight chamber of the tube body and diffusing and recirculating via the capillary structures; the heat pipe structure of the present invention can achieve a low-temperature start-up phase change within the tube body for phase change latent heat heat exchange at an ambient temperature of 0 to -90 degrees Celsius.

Description

Technical Field

[0001] The present invention relates to a heat pipe structure, in particular to a low-temperature starting phase change latent heat heat pipe structure capable of generating phase change latent heat heat exchange in a pipe body at an ambient temperature of 0 to -90 degrees. Background Art

[0002] Traditional heat pipes have a hollow shell (tube) body, and a capillary wick and a working fluid (water, refrigerant, methanol, acetone, liquid ammonia, etc.) are arranged inside the shell (tube). The hollow shell (tube) body is currently mostly made of materials such as copper and aluminum because the working fluid inside the hollow shell (tube) undergoes a phase change latent heat mechanism to conduct heat.

[0003] However, heat pipes currently used in electronic product cooling are made of copper and pure water. Due to the excellent thermal conductivity of copper and the high latent heat of the working fluid, these heat pipes can be used in most normal environments. However, they are still subject to application limitations, such as outdoor applications (5G and 6G base stations, outdoor photovoltaic IGBT cooling, automotive applications, and any indoor or outdoor applications requiring heat dissipation). The problem of freezing of the working fluid at an ambient temperature of 0°C and the impact of freezing molecular forces on structural strength are also limitations.

[0004] Therefore, how to provide appropriate protection against freezing of the internal working fluid at low temperatures, thereby disrupting the vapor-liquid circulation within the heat pipe, is a primary goal for those skilled in the art. Summary of the Invention

[0005] Therefore, in order to effectively solve the above problems, the main purpose of the present invention is to provide a low-temperature starting phase change latent heat heat pipe structure that can generate phase change latent heat heat exchange in the shell at an ambient temperature of 0 to -90 degrees.

[0006] To achieve the above-mentioned objectives, the present invention provides a heat pipe structure, characterized by comprising:

[0007] a tubular body having an airtight chamber;

[0008] A plurality of capillary structures, each of which is composed of a groove, a grid body, and sintered powder layered from the outside to the inside. The plurality of grooves has an open side and a closed side, the width of the open side is smaller than the width of the closed side, and is disposed in the airtight chamber;

[0009] A working fluid is filled in the airtight chamber of the tube body and diffuses and refluxes through the capillary structure.

[0010] The heat pipe structure, wherein: the cross-sectional shape of the groove is inverted trapezoidal, ohmic or triangular.

[0011] The heat pipe structure, wherein: the sintered powder is a structure sintered from any one of copper powder, aluminum powder, and nickel powder.

[0012] The heat pipe structure, wherein: the material of the grid body is any one of copper, aluminum, stainless steel, and titanium.

[0013] The heat pipe structure, wherein: the pipe body material is any one of aluminum, copper, stainless steel, and titanium.

[0014] The advantage of the present invention is that the multiple capillary structures are composed of the grooves, grid bodies, and sintered powders layered from the outside to the inside, and the multiple grooves have an open side and a closed side, and the width of the open side is smaller than the width of the closed side; the working fluid is filled in the airtight chamber of the tube body and diffuses and refluxes through the multiple capillary structures. The grid body is arranged to further separate the sintered powder body from the grooves to prevent the powder of the sintered powder body from falling into the grooves and blocking the grooves, thereby affecting the diffusion path of the vaporous working fluid in the grooves. Through the heat pipe structure of the present invention, a low-temperature starting phase change of phase change latent heat heat exchange can still occur in the tube body at an ambient temperature of 0 to -90 degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional exploded view of a first embodiment of the heat pipe structure of the present invention;

[0016] Figure 2 It is a combined cross-sectional view of the first embodiment of the heat pipe structure of the present invention.

[0017] Explanation of reference numerals: tube body 11 ; airtight chamber 111 ; multiple capillary structures 12 ; groove 121 ; open side 1211 ; closed side 1212 ; grid body 122 ; outer surface 1221 ; inner surface 1222 ; sintered powder 123 ; the working fluid 2 ; powder sintered body 3 . DETAILED DESCRIPTION

[0018] The above-mentioned objectives and structural and functional characteristics of the present invention will be described with reference to the preferred embodiments shown in the accompanying drawings.

[0019] See also Figure 1 、 Figure 2 , is a three-dimensional exploded and assembled cross-sectional view of the first embodiment of the heat pipe structure of the present invention. As shown in the figure, the heat pipe structure of the present invention comprises: a tube body 11, a plurality of capillary structures 12, and a working fluid 2;

[0020] The tube body 11 has an airtight chamber 111. The material of the tube body 11 is aluminum (the aluminum material is exemplified by model A3003 or Al6063 but is not limited thereto. The wall thickness of the tube body 11 is approximately 0.5 mm, and the groove 112 is 0.3 mm deep and 0.3 mm wide), copper, stainless steel, or titanium. The tube body 11 is any of a round tube, a flat tube, and a square tube. The tube body has an evaporation area (which can be set at one end or the middle of the tube body) and a heat dissipation area (which can be set at one end of the tube body).

[0021] The plurality of capillary structures 12 are composed of a groove 121, a grid body 122, and a sintered powder 123, which are layered from the outside to the inside. The plurality of grooves 121 are arranged in a ring array on the wall of the tube body 11, and the plurality of grooves 121 have an open side 1211 and a closed side 1212. The width of the open side 1211 is smaller than the width of the closed side 1212. The cross-sectional shape of the groove 121 is an inverted trapezoid, an ohmic type, or a triangle. The outer surface of the grid body 122 is bonded to the inner wall surface of the tube body 11 by sintering or diffusion bonding. The material of the grid body 122 is any one of copper, aluminum, stainless steel, and titanium. Among them, the aluminum material is exemplified by models A3003 and Al6063 but is not limited thereto. The grid body number is preferably 200#, but is not limited thereto.

[0022] The working fluid 2 is filled in the airtight chamber 111 of the tube body 11. When the working fluid 2 is working, the liquid working fluid will be evaporated and converted into a vaporous working fluid in the evaporation area and diffused in the airtight chamber 111 and / or the groove or flowed to the heat dissipation area for heat dissipation and cooling. When the vaporous working fluid condenses, it condenses and converts into a liquid working fluid. After being converted into a liquid working fluid, the capillary phenomenon is generated through the grid body 122 and the sintered powder 123 and / or the groove 121 to guide the liquid working fluid back to the evaporation area of ​​the tube body 11 (the part in contact with the heat source). The groove 121 can be used for the reflux of the condensed liquid working fluid or the diffusion of the evaporated vaporous working fluid.

[0023] The grid body 122 is primarily configured to separate the sintered powder 123 from the groove 121, preventing the sintered powder 123 from falling into the groove 121 and blocking the groove 121, thereby affecting the diffusion path of the liquid working fluid 22 in the groove 121. This allows the present invention to still undergo a low-temperature startup phase change for phase change latent heat heat exchange within the tube body 11 at an ambient temperature of 0 to -90 degrees Celsius.

[0024] The grid body 122 has an outer surface 1221 and an inner surface 1222. The outer surface 1221 is arranged corresponding to the open side 1211 of the groove 121. The inner surface 122 is provided with a powder sintered body 3. The sintered powder body 3 is a structure sintered from any one of copper powder, aluminum powder, and nickel powder.

[0025] The working fluid 2 is filled in the airtight chamber 111 of the tube body 11 .

[0026] The present invention provides a multi-scale capillary wick low-temperature heat pipe. In one embodiment, the tube body 11 is primarily constructed of aluminum, with "Ω"-shaped grooves formed on the inner wall of the tube body 11, an aluminum mesh, and a sintered powder body. Finally, the tube body 11 is vacuum-filled with a working liquid (refrigerant) (liquidus point -90 degrees Celsius), resulting in an operating temperature range of -90 degrees Celsius to 100 degrees Celsius. For outdoor applications (such as 5G and 6G base station chip cooling, photovoltaic power supply IBGT cooling, and automotive chip cooling), the tube body can undergo phase change latent heat heat exchange at ambient temperatures of 0 to -90 degrees Celsius. This low-temperature activation of the phase change latent heat heat pipe, i.e., a low-temperature heat pipe structure, prevents the internal working liquid from freezing when the heat pipe is used in a low-temperature environment, maintaining normal vapor-liquid circulation within the heat pipe.

Claims

1. A heat pipe structure, characterized in that: Include: a tubular body having an airtight chamber; A plurality of capillary structures, each of which is composed of a groove, a grid body, and sintered powder layered from the outside to the inside. The plurality of grooves has an open side and a closed side, the width of the open side is smaller than the width of the closed side, and is disposed in the airtight chamber; A working fluid is filled in the airtight chamber of the tube body and diffuses and refluxes through the capillary structure.

2. The heat pipe structure according to claim 1, wherein: The cross-sectional shape of the groove is inverted trapezoidal, ohmic or triangular.

3. The heat pipe structure according to claim 1, wherein: The sintered powder is a structure obtained by sintering any one of copper powder, aluminum powder and nickel powder.

4. The heat pipe structure according to claim 1, wherein: The mesh body is made of any one of copper, aluminum, stainless steel and titanium.

5. The heat pipe structure according to claim 1, wherein: The tube body is made of any one of aluminum, copper, stainless steel and titanium.

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