JP3194101U - Heat pipe with composite capillary structure - Google Patents

Abstract

A heat pipe having a composite capillary structure composed of different capillary structures is provided. A tube body 11, a first capillary structure 12, and a second capillary structure 13 are included. The tube 11 has a chamber 115 and a bottom wall 112 provided at the bottom of the chamber 115. The chamber 115 has an evaporation unit 101, a cavity 102, and a condensing unit 103 in that order. The first capillary structure 12 is a net structure in which a plurality of fibers intersect, and is attached on the bottom wall 112 of the evaporation portion 101 of the tube body 11. The second capillary structure 13 is a braid knitted by knitting a plurality of fibers, and is distributed in the axial direction of the tubular body 11 and extends from the evaporation unit 101 through the cavity 102 to the condensation unit 103. The combination of the first capillary structure and the second capillary structure can withstand a high-temperature heat source, achieve a suitable heat dissipation effect, and can be used for various ultra-thin electronic devices and portable devices. [Selection] Figure 1

Description

  The present invention relates to a heat pipe having a capillary structure, and more particularly to a heat pipe having a composite capillary structure composed of different capillary structures.

  As electrical products such as computers and electronic devices are remarkably reduced in size and performance, heat conduction devices and heat dissipation devices used therein are also required to satisfy the needs for reduction in size and thickness.

  A heat pipe is a heat conduction device with good heat transfer efficiency, has a heat transfer efficiency of several to several tens of times that of metals such as copper and aluminum, and is used as a cooling device in electronic devices with various types of heat generation. .

  There are many manufacturing methods for conventional heat pipes. For example, after the metal powder filled in the hollow tube is sintered to form a capillary structure layer on the inner wall of the hollow tube, the tube is vacuumed. Then, there is a method of filling the working fluid and finally sealing. There is also a method in which the wire mesh arranged in the hollow tube body spreads and sticks to the inner wall of the hollow tube body to form a capillary structure layer, and then the tube body is evacuated and filled with a working fluid and finally sealed. is there. However, recently, there is a tendency to be reduced in size and thickness, and it is necessary to manufacture a flat plate heat pipe.

  Although the flat plate heat pipe has realized the purpose of thinning, it has exposed a new problem. In conventional flat plate heat pipes, metal powder is sintered on the wall surface of the tube to completely cover the surface of the tube. However, when pressure is applied to the tube, capillary structures on both sides of the tube (sintered metal) (Powder or wick) became more susceptible to damage. For this reason, the inner wall is peeled off, and the heat transfer efficiency is greatly reduced, or in some cases, the heat transfer efficiency is lost. In addition, although the heat pipe realized conduction of the heat source, it was necessary to make the flat heat pipe thin for use in smart phones, tablet PCs, and ultra-thin notebook PCs, but completely covered the inner wall surface. In the case of a heat pipe with a capillary structure, if the thickness of the capillary structure is added to the thickness of the tube itself, further reduction in thickness cannot be realized effectively. It could not be used for notebook PCs.

JP2013-88062A

The first object of the present invention is that the capillary structure provided along the axial direction of the tubular body transmits the working fluid in the axial direction and has a large area disposed at the bottom of one end of the tubular body. An object of the present invention is to provide a heat pipe having a composite capillary structure in which one capillary structure transmits a working fluid in a radial direction.
The second object of the present invention is to overlap the first capillary structure disposed on one of the heat receiving surfaces of the evaporation section with the second capillary structure extending from the evaporation section through the cavity to the condensation section. By disposing, the working fluid in the condensing part circulates axially along the second capillary structure to the evaporating part and diffuses radially along one side of the evaporating part along the first capillary structure The object is to provide a heat pipe having a capillary structure.

To achieve the above object, the present invention provides a heat pipe having a composite capillary structure. The heat pipe having the composite capillary structure of the present invention includes a tubular body, a first capillary structure, and a second capillary structure. The tube has a chamber and a bottom wall provided at the bottom of the chamber. The chamber has an evaporation part, a cavity and a condensation part in order. The first capillary structure is a net structure formed by crossing a plurality of fibers, and is attached on the bottom wall of the evaporation part of the tube. The second capillary structure is a braid knitted by weaving a plurality of fibers, distributed in the axial direction of the tubular body, and extends from the evaporation section to the condensation section through the cavity. The combination of the first capillary structure and the second capillary structure can withstand a high-temperature heat source, achieve a suitable heat dissipation effect, and can be used for ultra-thin electronic devices and portable devices.

The heat pipe having the composite capillary structure of the present invention can withstand a high-temperature heat source and achieve a suitable heat dissipation effect by meeting the need for ultra-thinness by combining the capillary structures. Therefore, even when used in various electronic devices and portable devices such as mobile phones, tablet PCs, PDAs, digital displays, and ultra-thin notebook PCs, it is possible to effectively solve difficult heat dissipation problems.

It is a figure which shows the heat pipe by the 1st Embodiment of this invention. It is sectional drawing which shows the A-A 'surface of the evaporation part of the heat pipe of this invention. It is a figure which shows the 1st capillary structure and the 2nd capillary structure. It is sectional drawing which shows the B-B 'surface of the condensation part of the heat pipe of this invention. It is sectional drawing which shows the position in the chamber within the pipe body of the 2nd capillary structure of the heat pipe by the 2nd Embodiment of this invention. It is sectional drawing which shows the position in the chamber within the pipe body of the 2nd capillary structure of the heat pipe by the 3rd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.

  Please refer to FIG. FIG. 1 is a view showing a heat pipe according to a first embodiment of the present invention. As shown in FIG. 1, the heat pipe 10 of the present invention includes a tube body 11 having an evaporation unit 101, a cavity 102, and a condensing unit 103. The evaporator 101 and the condenser 103 are respectively located at both ends of the tube body 11. The cavity 102 is located in the middle part of the tube body 11 and communicates with the evaporator 101 and the condenser 103. The heat pipe 10 of the present invention is vertically long, but is not limited to this, and may be L-shaped or U-shaped as necessary.

  Please refer to FIGS. FIG. 2 is a cross-sectional view showing the A-A ′ plane of the evaporation part of the heat pipe of the present invention. FIG. 3 is a diagram showing a first capillary structure and a second capillary structure. As shown in FIGS. 1 to 3, the tube body 11 has a top wall 111, a bottom wall 112, and two side walls 113 and 114. The top wall 111 is opposed to the bottom wall 112 at an interval. The two side walls 113, 114 are located between the top wall 111 and the bottom wall 112. The top wall 111, the bottom wall 112, and the two side walls 113 and 114 are formed so as to surround the chamber 115. The chamber 115 is filled with a working fluid (not shown) which is, for example, water, an inorganic compound, alcohol, ketone, liquid metal, refrigerant, organic compound, or a mixture thereof. The evaporation part 101 has an inner surface 1011 on the side of the bottom wall 112 with respect to 114. The evaporation unit 101 further includes an outer surface 1012 on the side opposite to the inner surface 1011 and outside the bottom wall 112. The outer surface 1012 can come into contact with a heat generating device such as a CPU in a movable state, for example. The amount of heat generated by the heat generating device is conducted into the chamber 115 of the evaporation unit 101 through the bottom wall 112.

  A first capillary structure 12 and a second capillary structure 13 are arranged in 15. The working fluid in 15 is heated by the evaporation unit 101 to become a gas, moves to the condensing unit 103 through the cavity 102, and is cooled to become a liquid. Thereafter, the heat is conducted by the liquid-gas two-phase flow that circulates to the evaporation unit 101 by the capillary force of the first capillary structure 12 and the second capillary structure 13 and circulates between the evaporation unit 101 and the condensation unit 103. .

  In order to manufacture an extremely thin heat pipe, it is necessary to attach the first capillary structure 12 only to the bottom wall 112 of the evaporation portion 101 of the tube body 11. That is, the first capillary structure 12 is attached so as to cover the inner surface 1011 of the evaporation unit 101. As a result, the top wall 111 of the evaporation unit 101 and the surfaces of the two side walls 113 and 114 with respect to the chamber 115 have no structure. The first capillary structure 12 has a left side 121 and a right side 122 that are adjacent to the two side walls 113, 114 of the tube body 11, respectively. The left side 121 and the right side 122 define a first width b1. The first capillary structure 12 is a network structure formed by crossing a plurality of fibers, and the first capillary structure 12 of the present invention is a mesh structure that intersects vertically and horizontally and has a suitable longitudinal capillary force.

  The second capillary structure 13 is provided along the axial direction (longitudinal direction) of the tube body 11. That is, the second capillary structure 13 extends from the evaporation unit 101 through the cavity 102 to the condensation unit 103. The second capillary structure 13 of the evaporation unit 101 can be arranged so as to overlap the first capillary structure 12. The portion where the first capillary structure 12 and the second capillary structure 13 overlap is tightly connected to ensure that the capillary transmission path remains continuous. The second capillary structure 13 has a left side 131 and a right side 132. The left side 131 and the right side 132 define a second width b2 that is smaller than the first width b1 of the first capillary structure 12. In the present embodiment, the second capillary structure 13 is disposed at the center of the chamber 115. Therefore, the space in the chamber 115 is between the upper part of the second capillary structure 13 and the top wall 111, the left side 131 and the right side 132 of the second capillary structure 13, and the two side walls 113 and 114 of the tube body 11. And constitute a flow path through which the hydraulic fluid flows. The second capillary structure 13 is a braid formed by weaving a plurality of fibers, forms a structurally strong capillary structure, and has a suitable capillary force in the axial direction.

In particular, the fibers of the first capillary structure 12 and the second capillary structure 13 are made of a metal material, a non-metallic material glass, or carbon fiber. In a preferred embodiment, the first capillary structure 12 and the second capillary structure 13 may be made of the same material or different materials. Moreover, the diameters of the fibers of the first capillary structure 12 and the second capillary structure 13 may be the same or different.

  The density of the fibers of the first capillary structure 12 and the second capillary structure 13 is adjusted as necessary to make the density of the first capillary structure 12 the same as or higher than the density of the second capillary structure 13, It can be made smaller. When the density of the first capillary structure 12 is larger or smaller than the density of the second capillary structure 13, a different capillary transmission force is generated for the hydraulic fluid in the chamber 115. When the density of the first capillary structure 12 is the same as the density of the second capillary structure 13, both capillary transmission forces are the same.

  Please refer to FIG. 1 and FIG. FIG. 4 is a cross-sectional view showing the B-B ′ surface of the condensing part of the heat pipe of the present invention. As shown in FIGS. 1 and 4, the second capillary structure 13 that passes through the cavity 102 of the tubular body 11 and extends to the condensing unit 103 is the second capillary structure 13 that is a surface of the bottom wall 112 with respect to the chamber 115. And the bottom wall 112.

  When the hydraulic fluid in the evaporation unit 101 receives heat and evaporates into a gas, the heat is transferred to the condensation unit 103, and after cooling, it is circulated to the evaporation unit 101 more quickly by being arranged in the axial direction. The capillary structure 12 diffuses in the radial direction over the entire inner surface 1011 of the evaporation part 101.

  Please refer to FIG. 5 and FIG. FIG. 5 is a cross-sectional view showing a position in a chamber of a second capillary structure of a heat pipe according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view showing a position in a chamber of a second capillary structure of a heat pipe according to a third embodiment of the present invention. As shown in FIG. 5, the second capillary structure 13 may be disposed on one side of the chamber 115. In the present embodiment, the right side of the chamber 115 is disposed near the side wall 113 of the tube body 11. As shown in FIG. 6, two second capillary structures 13 a and second capillary structures 13 b are arranged on both sides of the chamber 115. In this embodiment, it is arrange | positioned in the vicinity of the two side walls 113 and 114 of the pipe body 11 on both the left and right sides of 115, respectively.

  The heat pipe of the present invention can realize a highly efficient heat radiation effect by withstanding a high-temperature heat source on the heat pipe under the need for an ultra-thin shape by combining the above structures. Therefore, for example, even if it is used for various electronic devices and portable devices such as mobile phones, tablet PCs, PDAs, digital displays, and ultra-thin notebook PCs, the heat dissipation problem can be effectively solved.

  Although the present invention discloses preferred embodiments as described above, these are not intended to limit the present invention in any way, and anyone skilled in the art is within the spirit and scope of the present invention. Various changes and modifications can be made. Therefore, the scope of protection of the present invention is based on the contents specified in the claims of the utility model.

DESCRIPTION OF SYMBOLS 10 Heat pipe 11 Tube 12 1st capillary structure 13 2nd capillary structure 13a 2nd capillary structure 13b 2nd capillary structure 101 Evaporating part 102 Cavity 103 Condensing part 111 Top wall 112 Bottom wall 113 Side wall 114 Side wall 115 Chamber 121 left side 122 right side 131 left side 132 right side 1011 inner surface 1012 outer surface b1 first width b2 second width

Claims (13)

A tubular body having a chamber and a bottom wall provided at the bottom of the chamber, the chamber having an evaporation portion, a cavity, and a condensation portion in order;
A first capillary structure attached to the bottom wall of the evaporation portion of the tubular body in a network structure formed by crossing a plurality of fibers;
A braided braided by weaving a plurality of fibers, distributed in the axial direction of the tubular body, and including a second capillary structure extending from the evaporation section to the condensation section through the cavity. A heat pipe having a composite capillary structure. 2. The heat pipe according to claim 1, wherein the second capillary structure of the evaporating unit is disposed so as to overlap the first capillary structure. The heat pipe according to claim 2, wherein the fibers of the first capillary structure and the second capillary structure are made of a metal material, glass of a non-metal material, or a carbon fiber material. The heat pipe according to claim 3, wherein the first capillary structure and the second capillary structure may be made of the same material or different materials. The heat pipe according to claim 3 or 4, wherein the density of the first capillary structure is larger or smaller than that of the second capillary structure. The evaporation unit has the inner surface on the bottom wall side, further has an outer surface on the opposite side of the bottom wall, and the outer surface contacts the heat generating device in a movable state. The heat pipe according to claim 1 or 4. The heat pipe according to claim 6, wherein the second capillary structure is disposed in a central portion of the chamber. The heat pipe according to claim 6, wherein the second capillary structure is disposed on one side of the chamber. The heat pipe according to claim 8, wherein another second capillary structure is further arranged on the other side of the chamber. The heat pipe according to claim 6, wherein the first capillary structure is attached so as to cover the inner surface of the evaporation section. 11. The first capillary structure according to claim 10, wherein the first capillary structure has a left side and a right side adjacent to two side walls of the tubular body, respectively, and the left side and the right side define a first width. The described heat pipe. The second capillary structure has a left side and a right side, and the left side and the right side define a second width that is less than a first width of the first capillary structure. 11. The heat pipe according to 11. 3. The heat pipe according to claim 2, wherein the top wall and the two side walls of the evaporation part have no structure on the surface of the evaporation part.

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