JPH0830638B2 - Method for manufacturing evaporation pipe of loop heat pipe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an evaporation pipe of a loop type heat pipe in which a plurality of liquid return pipes are mounted inside.

[0002]

2. Description of the Related Art As is well known, a loop heat pipe is
The vapor flow path and the liquid flow path are separated. For example, in FIG.
The loop-type heat pipe 1 shown in FIG. 1 has a structure in which an evaporation pipe 2 and a condensation unit (not shown) are connected so as to form a circulation path as a whole. The six liquid return pipes 3 provided are arranged at substantially equal intervals in the circumferential direction along the inside of the wick 4 provided on the inner peripheral surface of the evaporation pipe 2, and the coil spring is arranged at the center. It is attached to the evaporation tube 2 while being pressed outward by the mold spacer 5. Although not shown, the lower end of each liquid return pipe 3 is closed, and a nozzle hole toward the inner peripheral surface of the evaporation pipe 2 is provided on the lower side of each liquid return pipe 3 with a heat insulating coating 3a on the outer periphery. Many are formed so as to penetrate therethrough.

The upper ends of the six liquid return pipes 3 are arranged at the lower end of the condenser formed on the upper side of the evaporation pipe 2, and the working liquid condensed on the inner peripheral surface of the condenser is collected. In the evaporation portion formed on the lower side of the evaporation pipe, the working liquid is ejected from the nozzle hole toward the inner circumferential surface of the evaporation pipe 2 provided with the wick 4. Then, the working liquid is evaporated by the heat input to the evaporation unit, and the vapor transfers the heat to the condensation unit in the form of evaporation latent heat.

In the loop heat pipe 1, a plurality of liquid return pipes 3 are arranged along the inner peripheral surface of the evaporation pipe 2 at substantially equal intervals, and each liquid return pipe 3 is provided with a spacer 5.
The evaporation pipe 2 is linearly attached along the axial direction of the evaporation pipe 2 while being pressed against the inner peripheral surface of the evaporation pipe 2.
Therefore, when the evaporation pipe 2 is installed vertically, it is difficult for the working liquid ejected from the liquid return pipe 3 to reach the inner surface side of the evaporation pipe 2 in the middle part between the adjacent liquid return pipes 3 of the evaporation portion.
In such a loop-type heat pipe 1, the wick 4 is indispensable, and if the wick 4 cannot sufficiently exhibit its ability, the heat transport efficiency will be reduced.

On the other hand, if the liquid return pipe 3 is spirally attached to the inner surface of the evaporation pipe 2, even if the evaporation pipe 2 is installed vertically, the working liquid ejected from the liquid return pipe 3 is urged by the action of gravity. It can be sufficiently supplied to the inner surface side of the evaporation pipe 2 of the evaporation portion, and the heat transfer efficiency of the loop heat pipe 1 can be maintained sufficiently high even without the wick 4.

[0006]

However, it is not easy to form a plurality of liquid return pipes 3 in a spiral shape and attach them to the inner surface of the evaporation pipe 2 at substantially equal intervals. That is, it is necessary to form the plurality of liquid return pipes 3 in a spiral shape having a constant pitch and along the inner surface of the evaporation pipe 2, and the plurality of liquid return pipes 3 formed in a spiral shape are used. Evaporation tube 2 with equal spacing maintained
This is because it needs to be positioned inside.

The present invention has been made in view of the above circumstances, and provides a method for manufacturing an evaporation pipe of a loop heat pipe in which liquid return pipes can be easily attached to an inner surface in a spiral shape at regular intervals. That is the purpose.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of liquid return pipes each having a plurality of nozzle holes for ejecting a working liquid in an evaporation pipe of a heat pipe. In the method for manufacturing a loop-type heat pipe evaporation pipe, which is spirally attached at a predetermined interval close to the inner surface of the evaporation pipe so that a steam flow path along the axial direction is generated in the center of the evaporation pipe, An interposer in which a passage is formed in the radial direction of the evaporation pipe between the liquid return pipe and the liquid return pipe, which has air permeability toward the outer surface side of the spacer that forms the vapor flow path in the portion. And at the same time, so that the interposition material is spirally wound around the spacer outer surface so that the space between the liquid return tubes on the outer surface of the spacer is filled, and the outer diameter evaporates. Outside that is approximately equal to the inner diameter of the tube A step of forming the stranding body to form a combined body twist is characterized by having an insertion step of gradually inserting the stranding body canal.

Further, after the step of forming the twisted body,
You may make it perform the integrated process of the twisted body which spirally winds the wire or tape material for fixation on the outer surface of this twisted body.

[0010]

In the step of forming the twisted body, the liquid return pipe and the interposition material are simultaneously sent to the outer surface side of the spacer, and the liquid return pipe and the interposition material are twisted and wound around the spacer outer surface side. To form a twisted body. In this case, since the interposing material is twisted with the liquid return pipe so as to fill the gap between the liquid return pipes on the outer surface of the spacer, the liquid return pipes are arranged at a constant interval from each other along the inner surface of the evaporation pipe and at a predetermined distance. It is spirally wound around the spacer at a pitch of. Therefore, when the twisted body is inserted into the evaporation pipe in the inserting step, the liquid return pipe is attached to the inside surface of the evaporation pipe in a spiral shape in a predetermined state.

The spacer forms a vapor passage in the center of the evaporation pipe, and the interposer has air permeability or forms a passage communicating with the liquid return pipe in the radial direction of the evaporation pipe. Therefore, the function of the loop heat pipe is not impaired.

[0012]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 2 shows the structure inside the evaporation tube of the large-capacity loop heat pipe which is the object of the present invention. The loop-type heat pipe 11 has a structure in which an evaporation pipe 12 arranged in the vertical direction and a not-shown condensing part are connected so as to form a circulation path as a whole. On the inner surface, for example, six liquid return pipes 13 are evenly arranged in a spiral shape in contact with the inner peripheral surface of the evaporation pipe 12, and in the space between the liquid return pipes 13 and 13 adjacent to each other. The strip-shaped interposer material 14 having an arcuate cross section is similarly arranged in a spiral shape.

The belt-shaped interposer 14 is made of a heat-resistant foamed resin whose air permeability is ensured by being foamed by communicating cells, and is formed into a belt-shaped member having a thickness substantially the same as the diameter of the liquid return pipe 13 and adjacent to each other. It is arranged so as to fill the space between the liquid return pipes 13, 13. The liquid return pipe 13 and the interposer 14 are provided on the side of the evaporation pipe 12 while being pressed outward by a coil spring type spacer 15 arranged so that a vapor flow path is formed at the center thereof. It is attached to the inner surface. Reference numeral 16 is a thin wire rod for fixing the liquid return pipe 13 and the interposer 14 to the spacer 15.

Although not shown in the figure, the six liquid return pipes 13 arranged in the evaporation section at the bottom of the evaporation pipe 12 are provided with a large number of nozzles on the inner surface side of the emission pipe 12 in a state of being closed with the lower ends thereof. A hole is formed in the liquid return pipe 13 so that the working liquid can be ejected toward the inner surface of the evaporation pipe 12 through the nozzle hole. The upper ends of the respective liquid return pipes 13 are attached to the lower ends of the condensing parts formed in the upper part of the evaporation pipe 12.

Therefore, each liquid return pipe 1 in the evaporation section
The working liquid ejected from the nozzle hole of No. 3 toward the inner surface of the evaporation tube 12 directly reaches the inner surface of the evaporation tube 12 or reaches the inner surface of the evaporation tube 12 through the void in the interposer 14. , Moves downward along the inner surface of the evaporation tube 12 by the action of gravity. In this case, since the liquid return pipe 13 is spirally attached to the inner surface side of the evaporation pipe 12, the downward movement of the working liquid causes the inner surface of the evaporation pipe 12 in the evaporation portion to have the entire working surface without the wick. The heat that is wetted by and is generated outside the evaporation portion is absorbed by the evaporation of the working fluid. Since the interposer 14 can retain the hydraulic fluid in the voids, it also serves as a wick.

Then, the evaporated working fluid passes through the gap of the interposition material 14 and gathers at the center of the evaporation pipe 12 having the spacer 15, and then, ascending in the evaporation pipe 12 to reach the condensing portion,
Here, heat is radiated to be liquefied, and descends in the liquid return pipe 13 to reach the evaporation section. Since the interposer 14 also has a heat insulating effect, no heat insulating material is required on the outer surface of the liquid return pipe 13.

Next, a method of attaching the liquid return pipe 13 to the inner surface of the evaporation pipe 12 in a spiral shape with a certain gap therebetween with the interposition material 14 will be described. This manufacturing method includes a step of forming the twisted body 17, an integration step of the twisted body 17, and a step of inserting the twisted body 17 into the evaporation tube 12. The twisted body 17 is formed by helically twisting one or more liquid return pipes 13 and an interposer 14 filling the gap between the liquid return pipes 13 and 13 on the outer surface side of the spacer 15. The liquid return pipe 13, the interposer 14, and the spacer 1 excluding the evaporation pipe 12 and the like in FIG.
It is composed of 5.

The process of forming the twisted body 17 is shown on the left side of FIG. The twisted body 17 is formed by a twisting machine 21 similar to that used when forming a conductor for a cable.
It is formed by twisting the liquid return pipe 13 and the interposition material 14 together without a gap on the outer surface side of the spacer 15 moving forward. That is, the long spacer 15 is moved in the direction of the arrow in the pipe 22a of the rotary cage 22 to which the plurality of bobbins 23 are rotatably attached, and the liquid return pipe 13 and the interposer 14 wound on each bobbin 23 are removed. By rotating the rotation cage 22 and the wiring board 24 and the like around the spacer 15 while the tip is positioned and fixed to the spacer 15 via the wiring board 24 attached to the front end of the pipe 22a, the spacer 15 is moved through the bobbin 23. Liquid return pipe 13 and interposer 1 sent to the outer surface of the
4 is wound around the outer surface of the spacer 15 while being twisted to form a twisted body 17.

In this case, since the liquid return pipe 13 has a nozzle hole in a fixed direction and has a fixed orientation with respect to the evaporation pipe 12, and the interposer 14 also has a fixed orientation with respect to the evaporation pipe 12, each bobbin. 23 does not rotate about itself in the rotation direction of the rotating cage 22, but only revolves together with the rotating cage 22. Therefore, the liquid return pipe 13 and the interposer 14 are twisted as a whole.

The pitch of the liquid return pipe 13 (spacer 1
The shortest center-to-center distance between the same liquid return pipes 13 on the same ridge line 5 is determined by the number of the liquid return pipes 13 and the size and number of the interposers 14 arranged therebetween.

The process of integrating the twisted body 17 is shown in the center of FIG. To fix the twisted body 17 to the liquid return pipe 13 and the interposer 14 to the spacer 15, a wire winding machine 31 similar to the twisting machine 21 is used to spirally wind the wire 16 around the outer surface of the twisted body 17. Done by That is, the long twisted body 17 is moved in the direction of the arrow in the pipe 32a of the rotating cage 32 to which the bobbin 33 is attached, and the tip end of the wire 16 wound on the bobbin 33 is twisted via the wiring board 34. By connecting the wire rod 16 to the body 17 and rotating the rotating cage 32, the wiring board 34, and the like around the twisted body 17, the wire 16 is spirally wound around the outer surface of the twisted body 17 at a predetermined pitch, and the liquid return pipe 1
3 and the interposer 14 are fixed so as to bundle the spacers 15, and the twisted body 17 is integrated. The twisted body 17 integrated with the wire 16 is wound around a drum (not shown) if necessary.

Since the rotating direction of the rotating cage 32 of the winding machine 31 and the rotating direction of the rotating cage 22 of the twisting machine 21 are opposite to each other, the wire 16 is twisted in the spiral direction of the liquid return pipe 13 and the like. It is wound in the opposite direction to the role of taga. Of course, a thin, narrow tape may be used instead of the wire 16.

The twisted body 17 integrated with each other by the wire 16 is attached to the inner surface of the evaporation tube 12 by the insertion step into the evaporation tube 12 shown on the right side of FIG. Since the outer diameter of the twisted body 17 is slightly larger than the inner diameter of the evaporation tube 12, it is difficult to insert the twisted body 17 into the evaporation tube 12 as it is, but if tension is applied to the twisted body 17, the spacer 1
5 slightly expands to have a smaller diameter, and the twisted body 17 also has a slightly smaller diameter. Therefore, if the twisted body 17 is inserted into the evaporation tube 12 in a slightly stretched state and then the stretching of the twisted body 17 is stopped, the twisted body 17
Is attached to the inner surface of the evaporation tube 12 while being pressed by the elastic force of the spacer 15.

The outer diameter of the twisted body 17 is the evaporation tube 12
Even if it is smaller than the inner diameter of
After being inserted in 2, the part of the twisted body 17 may be fixed to the evaporation tube 12 in some form.

As described above, since the plurality of liquid return tubes 13 and the plurality of interposers 14 are twisted around the spacer 15 in the step of forming the twisted body 17, the liquid return tubes 13 are evaporated. Along the inner surface of the tube 12, it is easily formed into a spiral shape with a predetermined pitch, and these are interposed materials 14
It is easily positioned so as to have a predetermined gap through. And the integrated process of the twisted body 17 and the twisted body 1
Through the step of inserting 7 into the evaporation pipe 12, a plurality of spiral liquid return pipes 13 are easily mounted in the evaporation pipe 12 with a predetermined gap therebetween. Further, if the liquid return pipe 13 and the interposition material 14 can be firmly twisted around the spacer 15 and the twisting back is not caused,
The step of integrating the twisted body 17 may not be provided.

Incidentally, in the case of the loop type heat pipe 11, a wick is not necessary in the evaporation part, but it may be attached if necessary. In this case, the twisted body 17 may be inserted into the evaporation tube 12 to which the wick is attached, or after the wick is attached to the outer surface of the twisted body 17, these may be inserted into the evaporation tube 12.

In addition, even if it does not have air permeability,
As shown in FIG. 3, the evaporation pipe 12 is provided between the liquid return pipe 13.
Interposer 1 having a shape in which the steam flow path 18a is formed in the radial direction of the
If it is 8, it can be used in place of the interposer 14.

[0028]

As is apparent from the above description, according to the manufacturing method of the present invention, the liquid return pipes are easily separated from each other by the step of forming the twisted body through the interposing material. Since the spacer is spirally wound around the outer surface of the evaporation pipe along the inner surface of the evaporation pipe at a predetermined pitch, the liquid return pipe is spiraled in a predetermined state by inserting the twisted body into the evaporation pipe in the insertion step. It is easily attached to the inner surface of the evaporation tube. In this case, the intervening material and the spacer do not impair the function of the loop heat pipe.

Further, if an integrated step of spirally winding the twisted body with a wire or the like is provided, it is possible to prevent untwisting and the like.
An evaporation tube can be manufactured by inserting this twisted body.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a method of attaching a liquid return pipe to an inner surface of an evaporation pipe.

FIG. 2 is a perspective sectional view of the inside of an evaporation pipe of a loop heat pipe.

FIG. 3 is a view showing another interposer and the like mounted in the evaporation pipe.

FIG. 4 is a cross-sectional view showing the inside of an evaporation pipe of a conventional loop heat pipe.

[Explanation of symbols]

 12 evaporation pipe 13 liquid return pipe 14 interposer material 15 spacer 16 wire rod 17 twisted body 18 interposer material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masataka Mochizuki 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Ltd. (72) Inventor Fumiaki Aoyama 1-1-5, Kiba, Koto-ku, Tokyo Shareholders Company Fujikura (72) Inventor Kazuhiko Ohashi 1-5-1, Kiba, Koto-ku, Tokyo Stock Company Fujikura (72) Inventor Yoshio Kataoka 1-1-5 Kiba, Koto-ku, Tokyo Stock Company Fujikura Examination Government Eisuke Kiyota (56) References: Kaihei Hei 5-8254 (JP, U)

Claims (2)

[Claims] 1. A plurality of liquid return pipes, each of which has a large number of nozzle holes for ejecting a working liquid, formed in a heat pipe evaporation pipe,
A method for manufacturing a loop-type heat pipe evaporation pipe, which is attached spirally at a predetermined interval close to the inner surface of the evaporation pipe so that a vapor flow path along the axial direction is generated at the center of the evaporation pipe, A passage is formed between the liquid return pipe and the gas-permeable or liquid return pipe toward the outer surface side of the spacer that forms a vapor flow path in the center of the evaporation pipe in the radial direction of the evaporation pipe. The outer diameter of the spacer is sent out at the same time, and the interposer is spirally wound around the outer surface of the spacer so that the interposer fills the space between the liquid return tubes on the outer surface of the spacer. A twisted body forming step of forming a twisted body having an outer diameter substantially equal to the inner diameter of the evaporation tube,
And a step of inserting the twisted body into the tube, the method for manufacturing an evaporation tube of a loop heat pipe. 2. A step of unifying the twisted body in which a wire or tape material for fixing is spirally wound around the outer surface of the twisted body after the step of forming the twisted body. The method for manufacturing an evaporation pipe for a loop heat pipe according to claim 1.