JP3113254U - heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pipe having high heat dissipation performance.
In a heat pipe that achieves heat dissipation by an absorption / radiation cycle of a working fluid in a heat pipe (1), the heat pipe (1) includes a tubular body (10) and a metal net (20), The tube (10) is a hollow metal tube, the metal mesh (20) is accommodated in the tube (10), and a plurality of curved portions (axially recessed in the metal mesh (20) ( 23), and the curved portion (23) and the inner wall of the tube (10) define a plurality of gaps (14).
[Selection] Figure 4

Description

  The present invention relates to a kind of heat pipe, and more particularly to a heat pipe with improved heat dissipation performance.

  With the rapid development of the 3C science and technology industry, various 3C electronic products have constantly developed new and inventive designs in terms of their functions. A problem has arisen, and for this reason, most electronic products are equipped with a heat dissipation module to eliminate the heat energy inside the product.

  Taking a computer product as an example, if the heat energy generated by the electronic components cannot be eliminated, the temperature gradually increases, and the computer is stopped or cannot be operated due to overheating. For this reason, a personal computer is generally provided with a heat sink and a heat radiating fan. The heat sink is a metal piece having a plurality of fins on the surface, and is used to lower the temperature of the computer equipment. Although the heat dissipation area is increased by this heat sink, the elimination of the heat energy must depend on the surrounding airflow, and therefore, the fan blows away the heat of the heat sink. However, the heat sink described above is not efficient in heat conduction, and therefore heat cannot be removed from the case within a short time. This has led to the development of heat pipes, an advanced heat dissipation technology.

  The heat pipe is a closed metal tube, and an appropriate amount of working fluid, such as water or acetone, is enclosed inside. When one end (heating end) of the heat pipe receives heat, since the working fluid is in a vacuum state, the working fluid generates vapor pressure, and this vapor is directed toward the other end (cooling end) where the pressure is relatively low. The flow and condensation at this end and the latent heat of condensation are released, and the cooled working fluid is further returned to the heating end by capillary action. This achieves the purpose of heat conduction by constant evaporation and cooling.

  The flow rate of the gas phase fluid in the heat pipe is much higher than the speed at which the liquid phase working fluid returns to the heating end, so the return speed of the liquid phase working fluid is a determinant of the heat transfer performance. Generally, a heat pipe returns a working fluid in a liquid phase to the heating end by capillary force and gravity. The speed at which the working fluid returns is accelerated.

  The structure of a heat pipe having a known metal mesh as a capillary structure is as shown in FIG. 1, which includes a hollow tube 100 and a metal mesh 110, which has a plurality of axial metal wires 111. And a plurality of radial metal wires 112 are crossed so that the metal mesh 110 is completely brought into contact with the inner wall of the hollow tube body 100, thereby increasing the capillary force and returning the working fluid to the heating end. This achieves the purpose of improving the heat dissipation effect.

  However, although the above-mentioned heat pipe has a good capillary force, the metal net 110 is completely in contact with the inner wall of the hollow tube 100, so that the radial metal wire 112 returns to the working fluid that returns to the heating end. Thus, a situation occurs in which resistance force is generated and the return is prevented, so that the heat conduction effect is lowered, and thus the heat dissipation effect is limited.

  An object of the present invention is to provide a heat pipe having a high heat dissipation effect.

The invention of claim 1 is a heat pipe that achieves heat radiation by a work fluid suction / heat release cycle in the heat pipe (1).
The heat pipe (1) includes a tubular body (10) and a metal mesh (20). The tubular body (10) is a hollow metal tubular body, and the metallic mesh (20) is the tubular body (10). The metal net (20) is provided with a plurality of concave curved portions (23) in the axial direction, and the curved portion (23) and the inner wall of the tubular body (10) form a plurality of gaps (14). The heat pipe is characterized by being defined.
The invention of claim 2 is a heat pipe according to claim 1, characterized in that the tube (10) is made of copper.
The invention of claim 3 is a heat pipe according to claim 1, wherein the inner wall of the tube body (10) comprises a plurality of grooves (15).
The invention of claim 4 is the heat pipe according to claim 1, characterized in that the metal net (20) is made of copper.
The invention of claim 5 is the heat pipe according to claim 1, characterized in that the metal net (20) is sintered and fixed to the inner wall of the pipe body (10).

  The heat pipe of this embodiment achieves heat dissipation by the internal work fluid absorption / heat dissipation cycle, and the working fluid is returned to the heating end by combining the capillary force provided by the metal net, and the curved portion and the tube are defined. The speed at which the working fluid returns to the heating end is accelerated by the gap, and the heat pipe has a good capillary force and thermal conductivity, thereby achieving a high heat dissipation effect.

  In order to achieve the above object, the heat pipe of the present invention includes, in a preferred embodiment, a tube body and a metal net installed in the tube body and forming a capillary tissue. The metal mesh is combined so that a plurality of metal wires in the axial direction and a plurality of metal wires in the radial direction cross each other, and the capillary force can be increased by the metal mesh. In addition, the metal mesh of the present invention has a curved portion that is recessed in the axial direction, and when the metal mesh is placed in the tube, a plurality of gaps are defined between the bent portion and the tube, and the liquid phase returns to the heating end. The resistance to the working fluid is reduced by these gaps, thereby accelerating the speed of return to the heating end due to the capillary force of the working fluid.

  FIG. 2 shows a preferred embodiment of the heat pipe (1) submitted by the present invention. It includes a tube (10) and a metal net (20) that is placed inside the tube (10) to form a capillary tissue.

  Among them, the tube (10) is a hollow metal tube having a hollow portion (11) along the axial direction, and an appropriate amount of working fluid (not shown) such as pure water or acetone is contained in the hollow portion (11). It is enclosed and performs a heat release operation by a work fluid suction / heat release cycle.

  See also FIG. The material of the tube (10) is generally a copper material having a high thermal conductivity, and the tube (10) is a long copper tube. After being cut to a required length, one end is contracted and soldering or the like is performed. The sealing end (12) illustrated in the process is formed. However, the method of forming the sealing end (12) is not limited to this example. The other end of the tube (10) is an open end (13), which is subsequently sealed after the operation of inserting the capillary tissue.

  The capillary structure of the heat pipe (1) is a metal mesh (20), and the metal mesh (20) is combined so that a plurality of axial metal wires (21) and radial metal wires (22) cross each other. In most cases, the material is a copper material having high thermal conductivity, and the capillary force is increased by the metal net (20). However, in this embodiment, the metal net (20) is formed into a circular tube shape and inserted into the pipe body (10), and a plurality of curved portions (23) recessed toward the axis are formed in the metal net (20). After the metal net (20) is inserted into the tube (10), a plurality of gaps (14) are defined between the curved portion (23) and the inner wall of the tube (10), and the heat pipe (1) In accordance with the direction of installation, i.e. the working fluid in the liquid phase passes through these gaps (14), the resistance provided by the axial metal wire (21) is reduced, and the working fluid returns to the heating end by the action of capillary forces. The speed is accelerated, which increases the thermal conductivity of the heat pipe (1) and enhances its heat dissipation effect.

  In the manufacturing process of the heat pipe (1) of this embodiment, first, the metal net (20) is inserted from the open end (13) of the pipe body (10), and the metal net (20) is inserted into the hollow part (10) of the pipe body (10). 11), all the portions other than the curved portion (23) of the metal net (20) are brought into contact with the inner wall of the tube (10), and then the tube (10) is depressurized and evacuated to work fluid. (Not shown) is injected and the open end (13) is sealed to complete.

  After inserting the metal mesh (20), generally the operation of directly closing the opening is performed. However, since the fixing state of the metal mesh (20) in the tube (10) is poor, sintering at a higher temperature is performed. The metal net (20) is adhered to the inner wall of the pipe body (10).

  The metal mesh (20) of the preferred embodiment of the present invention is formed by combining a plurality of axial metal wires (21) and a plurality of radial metal wires (22) so that the liquid phase work is performed. The fluid returns to the heating end by the capillary force provided by the capillary tissue, and a plurality of gaps (14) formed by the plurality of curved portions (23) of the metal net (20) in cooperation with the tube (10) are combined. Thus, the resistance force against the return fluid generated by the radial metal wire (22) can be reduced, and the return speed of the liquid-phase working fluid is accelerated by the plurality of gaps (14).

  In the second embodiment of the present invention, a plurality of grooves (15) are provided on the inner wall of the tubular body (10). As shown in FIG. 4, the design of the groove (15) increases the area of the inner surface of the tube (10), accelerates the flow velocity in the hollow portion (11) of the working fluid, and the working fluid has the maximum amount of heat. Can be taken away.

  When using the two embodiments described above, as shown in FIG. 5, one end of the heat pipe (1) is in contact with the heat source (30), and the other end is in contact with or combined with the cooling device (40). (30) is a device that consumes power, such as a chip, CPU or LCD, and the cooling device (40) is a heat sink and is used for heat dissipation by convection, or is a heat dissipation fan and is forced by ventilation. It is used for heat dissipation. The inside of the tube (10) is in a vacuum state, whereby the internal working fluid evaporates at about 30 degrees Celsius, and the amount of heat generated by the heat source (30) at one end contacting the heat source (30) of the heat pipe (1). The working fluid changes from the liquid phase to the gas phase, and this gas further flows through the hollow channel of the heat pipe (1) to reach one end where it is in contact with or combined with the cooling device (40). The amount of heat is removed by the device (40), whereby the temperature is lowered, the working fluid is thereby cooled and returned to the liquid phase, and the cooled working fluid is further fed into the metal mesh (20) inside the heat pipe (1). Thus, it returns to one end (heating end) in contact with the heat source (30), thus completing a single absorption / radiation cycle and effectively eliminating heat.

  In summary, the heat pipe (1) of the present invention uses a combination of a pipe body (10) and a metal net (20) having a plurality of curved portions (23), and works fluid in the heat pipe (1). It is returned to the heating end by the capillary force provided by the metal net (20), and the return speed is accelerated by the gap (14) defined by the curved portion (23) and the tube (10), which is good for the heat pipe (1). It has excellent capillary force and thermal conductivity to achieve a good heat dissipation effect.

  Although the present invention is described in the above embodiments, the above description does not limit the scope of the present invention, and any modification or alteration of details that can be made based on the present invention is within the scope of the claims of the present invention. Shall belong.

It is a structure display figure of a known heat pipe. It is a cross-sectional view of the Example of the heat pipe of this invention. It is a structure display figure of 1st Example of the heat pipe of this invention. It is a cross-sectional view of the second embodiment of the heat pipe of the present invention. It is a use condition display figure of the heat pipe of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Tube 102 Open end 104 Closed end 106 Middle hole 110 Copper pillar 120 Copper powder 1 Heat pipe 10 Tube 20 Metal mesh 11 Hollow part 12 Sealed end 13 Open end 21 Axial metal wire 22 Radial metal wire 23 Curved Part 14 gap 15 groove 30 heat source 40 cooling device

Claims (5)

In the heat pipe that achieves heat dissipation by the absorption / radiation cycle of the working fluid in the heat pipe (1),
The heat pipe (1) includes a tubular body (10) and a metal mesh (20). The tubular body (10) is a hollow metal tubular body, and the metallic mesh (20) is the tubular body (10). The metal net (20) is provided with a plurality of axially recessed curved portions (23), and the curved portion (23) and the inner wall of the tube (10) have a plurality of gaps (14). A heat pipe, characterized in that   2. The heat pipe according to claim 1, wherein the material of the pipe body (10) is a copper material.   2. The heat pipe according to claim 1, wherein the inner wall of the tubular body (10) comprises a plurality of grooves (15).   The heat pipe according to claim 1, wherein the metal net (20) is made of copper. The heat pipe according to claim 1, wherein the metal net (20) is sintered and fixed to the inner wall of the pipe body (10).

Images