KR20020030339A - Heat pipe appling slope type mesh wick and thereof producing method - Google Patents

Abstract

PURPOSE: A heat pipe and manufacturing method of the same applying slope type mesh wick are provided to increase capillarity to improve heat transfer. CONSTITUTION: A slope type mesh wick(110) is inserted into a pipe(100). A spiral spring(120) with a rectangular section is inserted into the pipe to support the slope type mesh wick to be attached on an inner circumferential surface of the pipe. The slope type mesh wick is made of fine wire(130) knitted. The pipe is processed by pressing to integrally have an upper and a lower flat surfaces and both side arc parts. The slope type mesh wick is inserted into the pipe as a pair and pressed together with the pipe to be placed on the both side arc parts, respectively.

Description

Heat pipe applying diagonal mesh wick and manufacturing method thereof {HEAT PIPE APPLING SLOPE TYPE MESH WICK AND THEREOF PRODUCING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to heat pipes, and more particularly, to a heat pipe and a manufacturing method using a diagonal mesh wick capable of smoothly transporting a working fluid circulated by a phase change and capillary force.

Referring to FIGS. 1 (a) and 1 (b), the conventional heat pipe is a wick 15 inserted into a pipe 10 in a vacuum state, and a certain amount of working fluid is injected, and then both ends are sealed. , The evaporator 20, the transfer unit 30 and the condensation unit 40, using the latent heat of evaporation of the working fluid device for efficiently transferring heat in a short time under a condition of the temperature difference on both sides of the heat pipe to be.

When the heat is applied to the evaporator 20 of the heat pipe, the working fluid accumulated in this part evaporates, and the evaporator moves rapidly along the empty space inside the pipe 10 with the amount of heat applied thereto. . When the evaporator reaches the condenser 40 having a low temperature, the evaporator is converted into a liquid through a phase change process due to the temperature difference, and the heat of the steam is released from the condenser 40 during this process. And while heat is applied by the force of capillary action, gravity, etc., the working fluid of the heat pipe is continuously changed into such liquid → heat absorption → gas → movement → heat release → liquid, and the working fluid is circulated. Heat is transferred in a short time without loss.

The performance and lifetime of such heat pipes are influenced by numerous variables such as internal cleanliness, filling amount of working fluid, surface roughness, combination of material and working fluid, material and structure of wick, and internal vacuum degree. However, considering only the structural aspects inside the heat pipe, the shape and assembly state of the wick 15 is the dominant variable. The wick 15 serves to transfer the vapor reached to the condensation unit 40 to the evaporator 20 by capillary force after absorbing it when it is released as heat and reduced to liquid. Therefore, generally, in order to produce a capillary effect, as shown in FIGS. 2 (a) and 2 (b), the screen mesh 50 used as the wick 15 may be rolled in a circular shape or drawn in FIG. 3 (a). Groove 60 is machined on the inner circumferential surface of the pipe 10 as shown in (b) and (b). In addition, the inner wall may be manufactured by sintering a porous metal.

In addition, recently used small diameter heat pipes for cooling electronic components are not used as straight lines with initial circular cross sections, but are applied to electric and electronic products through various post-treatment operations such as pressing, bending and plating. In case of pressing or bending, the diagonal mesh wick should always be in close contact with the inner wall of the heat pipe so that the performance of the heat pipe does not decrease even during the post-treatment process.

However, when the conventional heat pipes are applied to the heat pipes recently applied as above, the heat transfer rate is lowered because the net of the wick is woven into a rectangular neck, and the wick is formed on the inner circumference of the pipe. There is a problem that the capillary tube by the wick is not formed uniformly due to the excitation and wrinkles from the wick, and the inherent performance of the heat pipe is deteriorated due to difficulty in securing the steam flow path. There is a problem that can not be, there was a problem that the production line is lowered.

The present invention has been made to solve the above-mentioned conventional problems, by inserting a diagonal mesh wick into the inside of the pipe, the capillary effect is increased by attaching the diagonal mesh wick to a certain shape on the inner circumferential surface of the pipe and thus Accordingly, the heat transfer rate is increased, and the steam flow path is easily secured, and thus the performance of the heat pipe is improved. The heat pipe and the manufacturing method of the diagonal mesh wick, which are advantageous for mass production, are easily provided. The purpose is to.

1 is a cross-sectional view for explaining the principle of a general heat pipe.

Figure 2 (a), (b) is a perspective view and a cross-sectional view showing an example of a conventional heat pipe.

Figure 3 (a), (b) is a perspective view and a cross-sectional view showing another example of a conventional heat pipe.

4 to 5 are views of the present invention,

4 (a), (b) is a perspective view and a cross-sectional view of a heat pipe having a diagonal meshwick structure according to the present invention.

Fig. 5 (a) is sectional drawing before a pressing process.

Figure 5 (b) is a cross-sectional view showing the deformation state and position of the diagonal mesh wick and the support spring after the pressing process.

<Description of the reference numerals for the main parts of the drawings>

100: pipe 101: flat portion

102: arc portion 110: diagonal mesh wick

120: spiral spring 130: fine wire

In order to achieve the above object, the present invention provides a new type of wick and heat pipe for smoothly circulating the working fluid, which is a heat transporter, and a support spring for supporting the wick and the wick against the inner circumferential surface of the pipe. Provide a method of mounting. In addition, by applying the diagonal mesh wick to the heat pipe according to the present invention, the capillary effect is increased and thus the heat transfer rate is increased.

In addition, in the heat pipe using the wick, the working fluid reduced in the condensation part has a low flow resistance when it is transferred to the evaporation part by capillary force, and a smooth circulation is possible only when the transport volume per unit area is large.

In order to satisfy such a content, the diagonal mesh wick of the present invention is cut to a proper length by knitting in a constant width of a dense mesh form in the same way as weaving a cloth with a wire having a very small diameter. In addition, the support spring is produced by using a wire rod having a circular cross section through a rolling roll to produce a substantially rectangular cross section.

In addition, the inlet into the heat pipe of the diagonal mesh wick and the support spring is first inserted into the container (pipe) of the circular cross section and arranged to be symmetrical with each other, and then slightly smaller than the diameter of the pipe. The wire rod having a rectangular cross section is wound on a rod with a diameter in the form of a spiral spring and inserted into the pipe where the diagonal mesh wick is fixed. This completes two steps: making the wire into a spring and introducing a support spring into the copper pipe. After releasing the support springs fixed at both ends of the rods, the support springs are large in diameter due to their elasticity and strongly press the wick to the inner circumferential surface of the pipe by this force.

Specifically, the heat pipe according to the present invention, in the heat pipe that serves to transfer the working fluid reduced to the liquid by the phase change to the evaporation unit by gravity and capillary force, the diagonal mesh wick is inserted into the inside of the pipe The inner peripheral surface of the pipe is held in close contact by a spiral spring.

More specifically, the pipe is pressed to have the upper and lower planar portions and both arc portions integrally, and the diagonal mesh wick is knitted into a fine wire, and a pair is inserted into the pipe and pressed together with the pipe. The spiral springs are coupled to each of the two circular arc portions, and the spiral springs are inserted into the pipes and pressed together with the diagonal mesh wicks to closely support the pair of diagonal mesh wicks to the inner circumferential surfaces of both circular arcs of the pipe. Combined.

In addition, the method for manufacturing a heat pipe to which a diagonal mesh wick is applied according to the present invention includes inserting a pair of diagonal mesh wicks into a pipe having a circular cross section so as to face each other, and into the diagonal mesh wick of the pipe. Inserting a helical spring, and allowing the pipe to have the upper and lower planar portions and both circular arc portions integrally, and the diagonal mesh wicks being positioned one by one on both circular arc portions to be closely supported by the spiral spring. And pressing.

Hereinafter, with reference to the accompanying drawings, the present invention will be described with an embodiment as follows.

4 (a) and 4 (b) are a perspective view and a cross-sectional view showing a form in which a diagonal mesh wick is coupled according to the present invention. In FIGS. 4 (a) and 4 (b), mesh wicks are formed in a circular pipe 100. 110 is shown assembled with the support spring 120.

The mesh wick 110 is manufactured by knitting the micro fine wire 130, the diagonal mesh wick 110 is, for example, the crossing angle of the micro fine wire 130 is 55 ~ 65 °, the fine wire 130 is It is possible to obtain the absorption and capillary effect of the internal working fluid because it has the form of a fabric such as cloth by braiding. In addition, since the diagonal mesh wick 110 assembled up and down inside the pipe 100 has two layers, respectively, the working fluid flows in the space therebetween, so that heat can be transported more quickly.

In addition, since the diagonal mesh wick 110 is knitted with a fine wire 130, it shows flexibility as a general cloth in nature. That is, the processing is easy and can be bent smoothly along the bending line without breaking or bending during bending.

Figure 5 (a) is a cross-sectional view of the heat pipe assembled by assembling the diagonal mesh wick and the spring inside the pipe of the circular cross-section, Figure 5 (b) is the arrangement of the diagonal mesh wick and the support spring when pressing As a cross-sectional view showing a changed shape, hereinafter with reference to Figure 5 (a), (b) together, the heat pipe of the present invention, as shown in Figure 5 (a), a diagonal mesh wick (inside the pipe 100) 110 is inserted up and down symmetrically, and the support spring 120 is compressed by the diagonal mesh wick 110 to the inner wall of the pipe 100 by elasticity, and then coupled to the pipe 100, as shown in Figure 5 (b) ) Has a configuration in which the cross section is changed by pressing in a long ellipse shape.

Hereinafter, a process of manufacturing the heat pipe of the present invention as described above is as follows.

First, referring to FIGS. 4 (a) and 4 (b), a pair of diagonal mesh wicks 110 are inserted into a circular pipe 100 so as to face each other, and then the diagonal mesh of the pipe 100 is inserted. The spiral spring 120 is inserted into the wick 110.

In this case, when the spiral spring 120 is inserted into the pipe 100, a spring wire rod rolled to have a rectangular cross section is spirally wound on a circular rod (not shown) and inserted into the inside of the pipe 100. Is inserted into the process of separating out from the spiral spring 120, and then release the spiral spring 120 fixed to both ends of the circular rod, the spiral spring 120 is larger due to its elasticity and As a result, the diagonal mesh wick 110 is strongly compressed to the inner circumferential surface of the pipe 100.

Thereafter, as shown in FIG. 5 (a), a pair of diagonal mesh wicks 110 are placed on a press so as to face both sides and pressed, and as shown in FIG. 5 (b), the pipe 100 is pressed. ) Has an upper and lower planar portion 101 and both circular arc portions 102 integrally, and the diagonal mesh wick 110 is positioned one by one on both circular arc portions 102 to the spiral spring 120. It is made in the form that is closely supported by, and the both ends of the pipe 100 is sealed in a conventional manner to complete the heat pipe.

Since the heat pipe of the present invention as described above is a form in which the diagonal mesh wick 110 is compressed on the inner circumferential surface of the pipe 100 by the elasticity of the helical spring 120, the diagonal mesh wick 110 is also used during pressing or bending. The state in which the pipe 100 is in close contact with the inner circumferential surface can be maintained, and since the wick 110 exists only at a certain portion of the pipe 100, the wick 15 is installed between all the interiors of the heat pipe after pressing. It is easier to secure the steam flow path than to

In addition, since the diagonal mesh wick 110 is arranged symmetrically in the transverse direction, it is possible to secure a larger vapor flow path in the evaporation part during pressing processing than the heat pipe in which the wick 15 is located around the cross section of the entire circumference. It is possible, and the adhesion between the diagonal mesh wick 110 and the pipe 100 is better at the front compression of the heat pipe. And this is directly related to the increase in the amount of heat transport.

As described above, the present invention uses a micro wire inside the pipe to arrange a diagonal mesh wick having a very fine pore in the transverse direction and assembles a support spring so that the wick is in close contact with the inner circumferential surface of the pipe. The heat transfer rate is increased, and even after pressing, diagonal mesh wicks are located at both arcs of the pipe and only a support spring is located inside the pipe, so it is easy to secure a steam flow path, thereby inherent to the performance of the heat pipe. This has the advantage that it does not degrade.

Then, a pair of diagonal mesh wicks are inserted to face each other inside the pipe, and a spiral spring is inserted in the form of a coil wound around the inside of the pipe, and the rod is taken out to connect the diagonal mesh wick by the elasticity of the spiral spring itself. After closely contacting the inner circumferential surface of the pipe, it is produced by pressing the pipe so as to have the upper and lower flat portions and both circular arc portions, the mesh wick can be very stable and firmly coupled, and easy to manufacture, there is an easy effect for mass production.

Claims (7)

In the heat pipe that serves to transfer the working fluid reduced to the liquid by the phase change to the evaporation unit by gravity and capillary forces, characterized in that the diagonal mesh wick 110 is inserted into the pipe 100 Heat pipe with diagonal mesh wick. The method of claim 1, wherein the spiral spring 120 having a rectangular cross section is inserted into the pipe 100, and the diagonal mesh wick 110 is configured to be closely supported on the inner circumferential surface of the pipe 100. Heat pipe with diagonal mesh wick. The heat pipe according to claim 1, wherein the diagonal mesh wick 110 is configured by knitting a fine wire 130. According to claim 1, The pipe 100 is pressed to have the upper and lower planar portion 101 and both side arc portion 102 integrally, the oblique mesh wick 110 is a fine line 130 In addition to knitting, a pair is inserted into the inside of the pipe 100 and pressed together with the pipe 100 so as to be coupled to be positioned at each of the two arcs 102, respectively. pipe. According to claim 1, wherein the spiral spring 120 is inserted into the inside of the mesh wick 110 in the pipe 100, pressed together with the diagonal mesh wick 110 is the pair of diagonal mesh Heat pipe to which the wick 110 is applied in close contact with the inner circumferential surface of the circular arc (102) on both sides of the pipe (100). Inserting a pair of diagonal mesh wicks 110 to face each other in a pipe 100 having a circular cross section, and spiral springs 120 into the diagonal mesh wicks 110 of the pipe 100. Inserting the pipe 100 such that the pipe 100 has the upper and lower planar portions 101 and both circular arc portions 102 integrally, and the diagonal mesh wicks are formed on both circular arc portions 102. Method for manufacturing a heat pipe to which a diagonal mesh wick is applied, characterized in that it comprises a step (110) is positioned so that each one is pressed in close contact with the spiral spring (120). The method of claim 6, wherein the inserting of the spiral spring 120 into the pipe 100 includes a step of spirally winding a spring wire rod rolled to have a rectangular cross section on a circular rod and inserting the inside of the pipe 100. By inserting the rod in the process of removing the rod from the spiral spring 120, the spiral spring 120 is to support the mesh wick 110 in close contact with the inner circumferential surface of the pipe 100 in its own elasticity. A method of manufacturing a heat pipe to which a diagonal mesh wick is applied.