TWI764690B - Heat pipe structure - Google Patents

Abstract

A heat pipe structure includes a pipe internally defining an airtight chamber, a plurality of wick structures provided in the pipe, and a working fluid filled in the airtight chamber. The wick structures include a plurality of axial grooves, a wire mesh and a sintered powder metal provided in the airtight chamber layer by layer from a radially outer side to a radially inner side. The grooves respectively have an open side and an opposite closed side, and the open side has a width smaller than that of the closed side. The working fluid is able to diffuse and flow back in the pipe through the wick structures. With the above arrangements, the heat pipe structure is a low-temperature heat pipe structure enabling latent heat exchange in a phase change of the working fluid in the pipe under an ambient temperature of 0℃ to -90℃.

Description

Heat pipe structure

The utility model relates to a heat pipe structure, especially a heat pipe structure capable of starting the latent heat of phase change at a low temperature and enabling heat exchange of latent heat of phase change in a pipe body at an ambient temperature of 0 to -90 degrees.

The traditional heat pipe system has a hollow shell (tube) body, and a capillary wick and working fluid (water, refrigerant, methanol, acetone, liquid ammonia, etc.) are arranged inside the shell (tube) body. ) body is currently mostly made of copper, aluminum and other materials on the market, because the internal working fluid of the hollow shell (tube) body undergoes a phase change latent heat mechanism for heat conduction.

However, currently used in the field of heat dissipation of electronic products are heat pipes made of copper material plus water (degree opper tube+Pure Water). It is used in normal environment; but it will still be subject to application conditions, such as outdoor (5G, 6G base station, outdoor photovoltaic power source IGBT heat dissipation, automotive or any indoor and outdoor applications that require heat dissipation), the working fluid is at an ambient temperature of 0 Conditional limitations such as the icing problem generated at high temperature and the influence of icing molecular force on the structural strength.

Therefore, how to properly prevent the internal working liquid from freezing at low temperature, thereby destroying the gas-liquid circulation inside the heat pipe is the first and foremost goal of those who are familiar with the art.

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

In order to achieve the above purpose, the present invention provides a heat pipe structure, which includes: a pipe body, a plurality of capillary structures, and a working fluid; the pipe body has an airtight chamber; the capillary structures are composed of the grooves, the mesh body , The sintered powder is composed of layers from outside to inside, the 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 pipe body, and Diffusion and reflow are carried out through the capillary structures, and the arrangement of the mesh body is used to further separate the sintered powder body from the groove, preventing the powder of the sintered powder body from falling into the groove and blocking the groove. , and then affect the diffusion path of the working fluid in the vapor state in the groove. Through the heat pipe structure of the present invention, the low temperature start-up phase change can still occur in the pipe body at an ambient temperature of 0~-90 degrees, and the latent heat exchange can still occur. .

11: Tube body

111: Airtight Chamber

12: capillary structure

121: Groove

1211: Open side

1212: closed side

122: Mesh

1221: Peripheral Surface

1222: Inner peripheral surface

123: Sintered Powder

2: Working fluid

3: Powder sintered body

Figure 1 is an exploded perspective view of the first embodiment of the heat pipe structure of the present invention; Figure 2 is a combined cross-sectional view of the first embodiment of the heat pipe structure of the present invention.

The above-mentioned objects of the present invention and their structural and functional characteristics will be described with reference to the preferred embodiments of the accompanying drawings.

Please refer to Figures 1 and 2, which are three-dimensional exploded and combined cross-sectional views of the first embodiment of the heat pipe structure of the present invention. As shown in the figures, the heat pipe structure of the present invention includes: a pipe body 11, a plurality of capillary structures 12, a working Fluid 2; the pipe body 11 has an airtight chamber 111, and the material of the pipe body 11 is aluminum (the aluminum material is again model A3003, A16063 as an example but not limited, the wall thickness of the pipe body 11 is about is 0.5mm, the groove 112 has a depth of 0.3mm and a width of 0.3mm), any of copper, stainless steel, and titanium, and the pipe body 11 is any of a round pipe, a flat pipe, and a square pipe, wherein the pipe body has An evaporation area (can be arranged at one end or the middle section of the tube body) and a heat dissipation area (can be arranged at one end of the tube body).

The capillary structures 12 are composed of a groove 121, a mesh body 122, and a sintered powder 123 layered from outside to inside. The grooves 121 are arranged in an annular array on the wall of the pipe body 11, and the The groove 121 has 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, and the mesh body The outer surface of 122 is joined with the inner wall surface of the pipe body 11 by means of sintering or diffusion bonding, and the material of the mesh body 122 is any one of copper, aluminum, stainless steel, and titanium, and the aluminum material is model A3003, Al6063 is taken as an example but not limited thereto, the number of meshes is preferably 200#, but not limited thereto.

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 is evaporated and converted into a vaporous working fluid by the evaporation area, and the working fluid 2 is stored in the airtight chamber 111 and Or diffuse in the groove or flow to the heat dissipation area for heat dissipation and cooling, when the vapor working fluid is condensed, it is condensed and converted into a liquid working fluid. The capillary phenomenon is generated to guide the liquid working fluid back to the evaporation area of the pipe body 11 (the part in contact with the heat source), and the groove 121 can be used for the condensed liquid working fluid to flow back or the evaporated vapor working fluid to diffuse.

The setting of the grid body 122 is mainly used to separate the sintered powder 123 from the groove 121 to prevent the powder of the sintered powder 123 from falling into the groove 121 and blocking the groove 121, thereby affecting the liquid state. The path of the fluid 2 diffusing in the groove 121 enables the present invention to initiate a phase change at a low temperature in the pipe body 11 with a phase change latent heat exchange at an ambient temperature of 0-90 degrees.

The grid body 122 has an outer peripheral surface 1221 and an inner peripheral surface 1222, the outer peripheral surface 1221 is correspondingly attached to the open side 1211 of the groove 121, the inner peripheral surface 1222 is provided with a powder sintered body 3, the said The sintered powder body 3 is a structure body sintered by any one of copper powder, aluminum powder, and nickel powder.

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

The present invention provides a multi-scale capillary wick low-temperature heat pipe, the pipe body 11 of which is described in an embodiment mainly by selecting aluminum material, setting "Ω" type grooves on the inner wall surface of the pipe body 11, and adding aluminum material meshes body and sintered powder body, and finally vacuumed and filled with working liquid (refrigerant (liquidus point -90 degrees), so that the working temperature range is -90 degrees ~ 100 degrees, for applications in outdoor scenarios (such as 5G, 6G base station wafers) Heat dissipation, photovoltaic power supply IBGT heat dissipation, vehicle chip heat dissipation), the phase change latent heat heat exchange can occur in the tube body at an ambient temperature of 0~-90 degrees, and the phase change latent heat heat pipe is activated at low temperature, that is, the low temperature heat pipe structure, so that when the heat pipe is used in a low temperature environment, the internal The working liquid does not freeze and keeps the vapor-liquid circulation inside the heat pipe running normally.

11: Tube body

111: Airtight Chamber

12: Complex capillary structure

121: Groove

1211: Open side

1212: closed side

122: Mesh

123: Sintered Powder

2: Working fluid

3: Powder sintered body

Claims (5)

A heat pipe structure comprises: a pipe body with an airtight chamber; a plurality of capillary structures, the capillary structures are composed of a groove, a mesh body, and a sintered powder layered from outside to inside, the grooves It 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 arranged in the airtight chamber; a working fluid is filled in the airtight chamber of the tube body, and passes through the capillary structure. Diffusion and reflux. The heat pipe structure according to claim 1, wherein the cross-sectional shape of the groove is an inverted trapezoid, an ohmic shape, or a triangle shape. The heat pipe structure according to claim 1, wherein the sintered powder is a structure sintered by any one of copper powder, aluminum powder, and nickel powder. The heat pipe structure according to claim 1, wherein the material of the mesh body is any one of copper, aluminum, stainless steel, and titanium. The heat pipe structure according to claim 1, wherein the material of the pipe body is any one of aluminum, copper, stainless steel, and titanium.

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