KR20070105224A - Doiuble heat pipe and manufacturing methode thereof - Google Patents

Abstract

A double heat pipe and a manufacturing method thereof are provided to allow smooth flow of operating fluid and to improve heat transfer efficiency by integrating metal foam inside a pipe body. A double heat pipe comprises a pipe main body(1) and an insulating pipe(3) for flow path separation. The insulating pipe is installed on the inner surface of a wick(2) formed inside the pipe main body. The insulating pipe is installed only in a transfer part except an evaporation part and a condensation part. The wick is made of porous metal foam to expand heat transfer area. A heat conduction fin for radiating or absorbing heat is additionally installed outside the pipe main body. The heat conduction fin is porous metal foam.

Description

Double pipe heat pipe and its manufacturing method {DOIUBLE HEAT PIPE AND MANUFACTURING METHODE THEREOF}

1 is a partial cross-sectional perspective view showing an example of a double pipe heat pipe according to the present invention;

2 is a cross-sectional view of a double tube heat pipe according to the present invention;

3 is a longitudinal cross-sectional view of the double tube heat pipe shown in FIG.

4 is a partial cross-sectional perspective view showing another example of a heat pipe according to the present invention;

5 is a longitudinal sectional view of the heat pipe shown in FIG. 4;

6 is a flow chart for explaining an example of the manufacturing process of the double-pipe heat pipe according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: pipe body

  11: evaporation unit

  12: transmission unit

  13: condensation unit

2: foamed metal

  21: Euro

  22: metal film

  23: plating film

  24: micropores

3: Euro separation pipe

4: heat transfer pin

  42: metal film

  43: plating film

  44: ventilator

The present invention relates to a heat pipe and a method of manufacturing the same, and more particularly, the evaporation part and the return part are separated from each other inside of one pipe main body, so that the heat pipe can be operated as a separate heat pipe, thus simplifying the construction and making heat easy. A pipe and a method of manufacturing the same.

In particular, while having the advantages of the separate type heat pipe, it can reduce the volume occupied by the heat pipe and can be easily installed like a general heat pipe, so it is less space-constrained and secures the weak points of the separate heat pipe. The present invention relates to a double-pipe heat pipe that can reduce the same as a general heat pipe.

In general, a heat pipe is used as a heat exchanger that effectively transfers heat at a low temperature by using latent heat of evaporation of a working fluid.

The heat pipe is configured by injecting a working fluid into a sealed container and evacuating it, and when one end is heated, a working fluid stored therein is vaporized to generate a pressure difference at both ends. Is moved to release heat to the surroundings, and the released working fluid is cooled through the process of condensation and then returned to the heating part.

The heat pipe is configured by storing the working fluid inside the pipe body of the vacuum, one side is formed with an evaporator to serve as an evaporator, the other side is formed with a condenser to serve as a condenser. In addition, these heat pipes have a wick installed and a wick not installed as a means for maintaining the wet state of the inner wall. The wick is a capillary structure, which is a groove (GROOVE) type, a mesh (MESH) and a sinter. There is a (SINTER) form.

Among the heat pipes as described above, there is a heat pipe in which the condenser and the evaporator are separated and the condenser and the evaporator are connected by the return unit.

This separation type heat pipe is that the evaporator and the condenser are separated about 70m. The principle of operation is that when the working fluid inside the vacuum-closed loop is heated by the hot thermal fluid in the evaporator, the working fluid evaporates and condenses through the steam riser. In this case, the steam moves to the evaporator through the liquid down tube by the low temperature fluid outside the condenser tube, circulates, and moves the heat.

Therefore, the separate heat pipe has the advantage that the distance between the evaporator and the condenser can be very far, and there must be an altitude difference in the installation position between the evaporator and the condenser, and the altitude difference corresponds to the pressure loss for transporting vapor and liquid The altitude difference must be greater than the height of the liquor, and the altitude difference must be greater than the height of the liquor, which corresponds to the pressure loss for transporting steam and liquid.

The present invention is to solve the problems of the prior art as described above, the structure is simple, easy processing, low production cost is low, not only smooth the blur of working fluid, but also improved heat transfer efficiency, separate heat pipe An object of the present invention is to provide a double pipe heat pipe and a method of manufacturing the same, which can distance the evaporator from the condenser very far.

The present invention for solving the technical problem is a pipe body with a working fluid embedded therein in a cylindrical shape sealed at both ends; The flow path separation pipe is installed on the inner surface of the wick formed inside the pipe body, and the flow path separation pipe is installed only on the transmission part except the evaporation part and the condensation part.

In another aspect, the present invention is made by forming the wick with a foamed metal having a porous structure in order to increase the heat transfer area.

According to another aspect of the invention, the present invention comprises the steps of forming a wick having concave-convex or pores so as to have a wide surface area in the inside of the pipe body, the one end is open; Installing a flow path separating tube in a transmission part of an inside of the pipe body in which the wick is formed; Injecting a working fluid into the pipe body in which the wick is formed and the flow path separation tube is installed; Sealing the open end of the pipe body and venting the air.

The invention will become more apparent through the preferred embodiments described below with reference to the accompanying drawings. Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce through embodiments of the present invention.

1 is a partial cross-sectional perspective view showing an example of a double pipe heat pipe according to the present invention, Figure 2 is a cross-sectional view of a double pipe heat pipe according to the present invention, Figure 3 is a longitudinal cross-sectional view of the double pipe heat pipe shown in Figure 2, 4 is a partial cross-sectional perspective view showing another example of the heat pipe according to the present invention, Figure 5 is a longitudinal cross-sectional view of the heat pipe shown in FIG.

As shown, the double pipe heat pipe according to the present invention further includes a flow path separating pipe 3 therein.

As shown in FIG. 2, the flow path separating tube 3 is a passage through which the working fluid heated in the evaporator 11 moves to the condenser 13, and is cooled in the condenser 13. By separating the passage of the working fluid to be returned to the two working fluids, that is to prevent the heat of the heated working fluid is transferred to the returning working fluid can increase the heat transfer efficiency more.

The pipe body (1) is a closed cylindrical cylinder, the working fluid is stored therein one end is an evaporator (11) serving as an evaporator, the other end is a condenser (13) acting as a condenser The interruption consists of a delivery part 12 which serves as a passage for moving the working fluid from the evaporator 11 to the condensation part 13 or from the condensation part 13 to the evaporation part 11. The division is not based on physical structure, but on internal operation.

That is, when the evaporator 11 is heated, the working fluid therein is evaporated to move to the condenser 13 due to the pressure difference and release heat to the surroundings, and then condensed in the condenser 13 to the evaporator 11. Return

The flow path separating tube 3 is made of metal having low thermal conductivity, synthetic resin, or the like.

The wick 2 formed on the inner wall of the pipe body 1 of the double pipe heat pipe configured as described above may be made of a foamed metal as shown in FIGS. 2 to 5.

As described above, the wick 2 is made of foamed metal, so the structure is simple and easy to process, so that the manufacturing cost is low, and the working fluid is not only smoothly cloudy, but also the heat transfer efficiency can be improved.

The foamed metal has micropores 24 formed by connecting small holes with each other.

The foamed metal 2 is installed in a structure in which a flow path 21 is formed in the center as shown.

In addition, a heat conduction fin 4 may be further installed on the outside of the pipe body 1 as shown. The heat conduction fins 4 are for easily absorbing heat in the evaporation unit 1 and dissipating heat in the condensation unit 13 more easily. The metal foam is formed inside the pipe body 1. It consists of a foamed metal as shown in (2).

The plurality of micropores 24 formed in the foamed metal 2 constituting the heat pipe having the foamed metal configured as described above are connected to or separated from each other as adjacent microcavities formed in the formation of the foamed metal 2 to be described later. As the contact area with the working fluid is widened, the working fluid may not flow smoothly. Therefore, the flow of the working fluid is smoothed by forming the flow path 21 through the foamed metal 2, and the supply of the working fluid to the micro holes 24, that is, the working fluid of the micro holes 24 is the flow path ( 21) can be moved more easily to transfer heat.

The manufacturing method of the double pipe heat pipe comprised as mentioned above is as follows.

Forming a wick (2) having irregularities or pores so as to have a wide surface area inside the pipe body (1) at which one end is opened; Installing a flow path separating tube (3) in the delivery part (12) of the inside of the pipe body in which the wick (2) is formed; Injecting a working fluid into the pipe body in which the wick 2 is formed and the flow path separation tube 3 is installed; Sealing the open end of the pipe body and venting the air.

First, there are various methods for forming the wick 2 in the heat pipe of the present invention. However, in the present invention, the foamed metal 2 is formed of the wick as an example as illustrated and described above.

In order to install the foamed metal, the pipe main body 1 having one open end is prepared.

The polyurethane filter foam for forming the foamed metal 2 is press-fitted through the open end of the pipe body 1 and then pretreated to form the metal film 22.

The polyurethane filter foam has a sponge-like structure in which a plurality of pores are formed, and the polyurethane filter foam is subjected to vacuum DC magnetron sputtering deposition or vacuum evaporation to form a metal film 22 in the pores. ) Is formed. As described above, heat is applied in a state where the metal film 22 is formed between the pores of the polyurethane filter foam to incinerate the polyurethane filter foam between the metal films 22.

As such, the polyurethane filter foam is incinerated, and only the metal film 22 remains to form fine pores 24 between the metal films 22.

As such, the foamed metal may be formed by leaving only the metal film 22, but the foamed metal thus formed may not only be weak in strength but also weak in adhesive strength with the polyurethane filter foam, and thus may be separated from the polyurethane filter foam before the incineration process is performed. It is not possible to obtain foamed metal in which vents are normally formed.

Accordingly, after the metal film 22 is formed, the plating film 23 is further formed on the surface thereof.

The plated film 23 is formed by plating copper or aluminum with a thickness of about 10 to 20 μm through the electrolytic plating method after the strike treatment in the plating bath.

The foamed metal produced by the above process may form a flow path 21 to smoothly flow the air as described above, and to pre-treat the polyurethane filter foam to form the flow path 21. The flow path 21 may be formed by performing a subsequent process after forming the flow path 21 through the polyurethane filter foam before.

When the foamed metal 2 is integrated in the deposited state on the inner wall of the pipe body 1 as described above, after storing the working fluid in the inside of the pipe body 1, blocking the open end, the closed pipe body ( Exhaust air from 1).

After the foamed metal is formed in the above process, the flow path separating tube 3 is installed in the middle of the formed flow path 21, that is, the transfer part 12, in the metal foam foam 2.

As shown in FIG. 6, the flow path separating pipe 3 is installed in a state in which metal film plating is performed, thereby preventing the metal film and the flow path separating pipe 3 from being integrated. Thus, the flow path separating pipe 3 is foamed. Although not separated or separated from the metal (2) but configured differently, the heat of the delivery unit 12 is transferred to the flow path separation pipe 3 so that the heat of the working fluid flowing inside the flow path separation pipe 3 flows into the flow path separation pipe ( It is blocked from being delivered to the cooled working fluid flowing outside of 3).

In the above process, the exhaust process may be performed first, and then a working fluid may be injected therein.

In addition, in the process of forming the foamed metal 2, the foamed metal may be formed on the outside of the pipe body 1 so that the thermally conductive fins 4 may be formed, and the thermally conductive fins 4 are not foamed metals. Ordinary plate-shaped cooling fins may be provided. However, by forming in the shape of the foam metal can shorten the manufacturing process and increase the heat transfer efficiency.

While the invention has been described with reference to the preferred embodiments, many modifications and variations are possible without departing from the scope and spirit of the invention as set forth in the claims below.

As described above, the present invention integrates the foamed metal into the inside of the pipe main body, and thus, the structure is simple and easy to process, so that the manufacturing cost is low, and the working fluid is not only smoothly blurred, but also the effect of improving heat transfer efficiency. There is.

While the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many various obvious modifications are possible without departing from the scope of the invention from this description. Therefore, the scope of the invention should be construed by the claims described to include many such variations.

Claims (8)

A pipe body 1 having a working fluid embedded therein in a cylindrical shape sealed at both ends; The heat insulating flow path separating tube 3 is installed on the inner surface of the wick 2 formed inside the pipe main body, but the flow path separating pipe 3 only in the transfer part 12 except the evaporation part 11 and the condensation part 13. Double pipe heat pipe, characterized in that configured to install. The method of claim 1, The wick (2) is a double-pipe heat pipe, characterized in that the foam metal having a porous structure to widen the heat transfer area. The method according to claim 1 or 2, Double pipe heat pipe, characterized in that the heat conduction fin (4) for the heat dissipation or heat absorption is further installed on the outside of the pipe body (1). The method of claim 3, wherein The heat conduction fin (4) is a double pipe heat pipe, characterized in that the porous foam metal. Forming a wick (2) having irregularities or pores so as to have a wide surface area inside the pipe body (1) in which one end is opened; Installing a flow path separating tube (3) in the delivery part (12) of the inside of the pipe body in which the wick (2) is formed; Injecting a working fluid into the pipe body in which the wick 2 is formed and the flow path separation tube 3 is installed; Sealing the open end of the pipe body and discharging air. The method of claim 5, The wick 2 formed inside the pipe main body is a foamed metal, and after forming the foamed metal, the step of forming a foamed metal serving as a heat conducting fin 4 on the outer circumferential surface of the pipe main body is further performed. Double pipe heat pipe manufacturing method. The method according to claim 5 or 6, Forming the foam metal, Forming a conductive metal film to impart conductivity after pretreating the polyurethane filter foam; And burning only the polyurethane filter foam covered by the conductive metal film to leave only the metal film. The method of claim 7, wherein And forming a metal plating film on the polyurethane filter foam having the metal film.

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