JPH058254U - Loop heat pipe - Google Patents

Abstract

(57) [Summary] [Purpose] To keep the correct position of the liquid return pipe. [Structure] Since an intervening material 15 having air permeability is provided so as to fill a gap between a plurality of liquid return pipes 14 arranged at equal intervals inside the evaporation pipe 12, a gap between the liquid return pipes 14 is provided. Can be held constant and a steam flow passage can be secured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a loop heat pipe in which a vapor flow path and a liquid flow path are separated.

[0002]

[Prior Art]

 As is well known, the loop heat pipe has its vapor flow passage and liquid flow passage separated from each other. For example, the loop heat pipe 1 shown in FIG. 4 has an evaporation pipe 2 and a condenser section (not shown) as a whole. Six liquid return pipes 3 having a structure connected so as to form a circulation path and having a heat insulating coating 3a provided on the outer circumference thereof are provided on the inner peripheral surface of the evaporation pipe 2. The wicks 4 are arranged along the inner side of the wick 4 at substantially equal intervals in the circumferential direction, and are fixed while being pressed outward by a coil spring type spacer 5 fitted in the center.

Although not shown, the lower ends of the respective liquid return pipes 3 are closed, and a large number of nozzle holes facing the inner peripheral surface of the evaporation pipe 2 are formed through the heat insulating coating 3a on the outer periphery. Has been done. Further, the upper ends of the six liquid return pipes 3 are arranged below the condensation portion formed on the upper end side of the evaporation pipe 2 so that the condensed working fluid gathers and flows into the inner peripheral surface of the condensation portion. It is provided so as to flow down in the liquid return pipe 3 and to be ejected from the nozzle hole to be supplied to the inner peripheral surface of the evaporation pipe 2 provided with the wick 4.

Then, the heat input to the evaporation section formed at the lower end of the evaporation tube 2 is transferred to the condensation section by the vapor of the working liquid in the form of latent heat of evaporation. Therefore, even if the diameter of the evaporating pipe 2 is increased, the distance from the nozzle hole (not shown) of the liquid return pipe 3 to the inner surface of the evaporating part is not increased so that the working liquid is sufficiently supplied to the evaporating part. Therefore, it is suitable for large diameter, large capacity loop type heat pipes.

[0005]

In the conventional loop heat pipe 1 described above, a plurality of liquid return pipes 3 are provided at substantially equal intervals along the inner peripheral surface of the evaporation pipe 2, and each liquid return pipe 3 is provided. The tube 3 is pressed and fixed to the inner peripheral surface of the evaporation tube 2 by a coil spring type spacer 5.

Therefore, since the liquid return pipes 3 arranged in the evaporation pipe 2 at substantially equal intervals are not fixed one by one, the liquid return pipes 3 together with the wick 4 and the spacer 5 are not fixed. There is a problem in that the liquid return pipes 3 are individually moved and the intervals are apt to be misaligned at the time of assembly for insertion into the evaporation pipes 2. If the intervals of the liquid return pipes 3 are uneven, the amount of the working liquid supplied to the inner surface of the evaporation pipe 2 varies depending on the location, and there is a problem that the heat transfer efficiency by the heat pipe decreases.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a loop-type heat pipe capable of exhibiting a predetermined heat transport capacity by keeping the arrangement of the liquid return pipe constant. To do.

[0008]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention provides a loop-type heat pipe equipped with a liquid return pipe in which a large number of nozzle holes for ejecting a working liquid are formed on the inner surface of an evaporation pipe. The tubes are arranged at a predetermined interval close to the inner surface of the evaporation tube so that a steam flow path along the axial direction is generated in the center of the evaporation tube, and the space between the adjacent liquid return tubes is provided with a space between the tubes. To fill the gap between the liquid return pipes, an intervening material having a passage communicating with the liquid return pipe by itself, or an interposer having a shape forming a passage communicating with the liquid return pipe in the radial direction of the vapor pipe is used. It is characterized by being installed in.

[0009]

[Action]

 With the above structure, the loop-type heat pipe of the present invention is provided with the interposition material in the space between the adjacent liquid return pipes. Does this interposition material have a passage through which steam passes? , Or because the passage is formed with the liquid return pipe, the steam heated by touching the inner surface of the evaporation pipe concentrates in the center of the evaporation pipe via the passage, and Becomes a vapor stream of and moves to the condensing part. In addition, although the interval between the plurality of liquid return pipes is kept constant by the interposition material in this way, the provision of the interposition material does not impair the heat transport capacity. Therefore, for example, at the time of manufacturing a heat pipe, even when a strip-shaped or string-shaped wick member is spirally wound around the plurality of liquid return pipes to be inserted into the evaporation pipe, each liquid return pipe can be held at a proper interval, It can be a loop-type heat pipe with desired performance.

[0010]

【Example】

 An embodiment in which the present invention is applied to a large-capacity loop heat pipe will be described below with reference to FIGS.

FIG. 1 shows a first embodiment of the present invention. A large-capacity loop heat pipe 11 has a structure in which an evaporation tube 12 and a condenser section (not shown) are connected so as to form a circulation path as a whole. Therefore, a wick 13 is arranged on the inner surface of the evaporation pipe 12, and six liquid return pipes 14 are equally arranged inside the wick 13 while being in contact with the inner circumference of the wick 13. In addition, an intervening material 15 having an arcuate cross section is provided in the space between the liquid return pipes 14 adjacent to each other. This belt-shaped interposer 15 is made of a heat-resistant foamed resin whose air permeability is ensured by foaming it with communicating cells, and is formed into a belt-shaped member having a thickness approximately the same as the diameter of the liquid return pipe 14 and adjacent liquid return pipes. It is provided so as to fill the space between 14 and 14. The coil spring type spacer 16 fitted in the center is fixed while being pressed outward.

Although not shown, the six liquid return pipes 14 disposed in the evaporation section at the lower end of the evaporation pipe 12 are closed at their lower ends, and a large number of nozzle holes are provided at the lower parts thereof. The working liquid is ejected toward the inner surface of the evaporation pipe 12 which is formed. Further, the upper ends of the respective liquid return pipes 14 are lower parts of the condenser formed at the upper end of the evaporation pipe 12, and the condensed working fluid gathers and flows into the inner peripheral surface of the condenser. Is arranged so as to flow down and jet from the nozzle hole.

Next, the operation of this embodiment configured as described above will be described.

In the large-capacity loop heat pipe 11 of this embodiment, a non-contractile interposer material 15 is fitted over both sides of a liquid return pipe 14 that is evenly arranged in an evaporation pipe 12. Therefore, it is possible to keep the distance between the liquid return pipes 14 so as not to disturb them. Further, since the interposition material 15 provided between the liquid return pipes 14 has air permeability, the working liquid ejected from the nozzle hole and supplied to the evaporation portion comes into contact with the inner surface of the evaporation pipe 12. The steam that is heated and generated passes through the interposition material 15, gathers in the space at the center of the tube, and moves upward as a steam flow toward the condensation part. Then, heat is taken away in the condensing part to be condensed, and is collected when flowing down the inner peripheral surface of the condensing part and flows into the liquid return pipe 14, then flows down to near the lower end and is ejected from the nozzle hole. And is again supplied to the evaporator.

Therefore, in the loop heat pipe 11 of this embodiment, since the non-contractile interposer material 15 is provided between the plurality of liquid return pipes 14, this serves as a spacer and the space between the liquid return pipes 14 is increased. Can be held constant, and the interposition material 15 has air permeability, and the steam of the working fluid can freely flow, so that a loop heat pipe having a heat transport capacity as designed can be obtained. .

FIG. 2 shows a second embodiment of the present invention, in which a large-capacity loop heat pipe 21 has a structure in which an evaporation pipe 22 and a not-shown condensing part are connected so as to form a circulation path as a whole. Further, a wick 23 is provided around the inner surface of the evaporation pipe 22, and six liquid return pipes 24 are evenly arranged inside the wick 23 while being in contact with the inner peripheral surface of the wick 23. In the space between the liquid return pipes 24, which are adjacent to each other, two rod-shaped interposers 25 each having a circular cross section and having substantially the same diameter as the liquid return pipes 24 are provided. The rod-shaped interposer 25 is made of a heat-resistant foamed resin that has air permeability by being foamed by communicating bubbles, and is provided so as to fill the space between the liquid return pipes 24, 24. It is fixed in a state of being pressed to the outside by a coil spring type spacer 26 fitted in.

Although not shown, the loop heat pipe 21 of this embodiment transports heat in the same manner as in the case of the first embodiment, and keeps the space between the liquid return pipes 24 constant. Therefore, a loop heat pipe having a heat transport capacity as designed can be obtained.

In particular, when the liquid return pipes 24 are twisted in a spiral shape so that the working liquid ejected from the liquid return pipes 24 is supplied to the entire inner surface of the evaporation portion, the liquid return pipes 24 are twisted between the liquid return pipes 24. If there is a space, it becomes difficult to keep the distance between the liquid return pipes constant. However, since the interposer 25 having substantially the same thickness is provided between the liquid return pipes 24 in this way, a plurality of liquid return pipes 24 are provided. The liquid return pipes 24 can be twisted together while maintaining a predetermined interval. Therefore, at the time of manufacturing the heat pipe, the plurality of liquid return pipes 24 and the wick 23 wound around the liquid return pipes 24 can be easily twisted together in the same manner as in the case of twisting a power cable or the like. . The liquid return pipe 24 twisted together with the wick 23 is inserted into a heat pipe container such as the evaporation pipe 22.

In the case of both of the above-mentioned embodiments, since the intervening materials 15 and 25 made of foam are provided between the respective liquid return pipes 14 and 24 arranged at equal intervals, the intervening materials are formed. Since the materials 15 and 25 are heat insulating materials, heating of the liquid return pipes 15 and 25 can be prevented without heat-insulating the outer circumferences of the liquid return pipes 15 and 25, and the hydraulic fluid in the liquid return pipes 15 and 25 can be prevented. It is possible to prevent the occurrence of defective reflux of the working fluid due to heating of the fluid.

Further, FIG. 3 shows a third embodiment of the present invention. In a large capacity loop heat pipe 31, an evaporation pipe 32 and a condenser section (not shown) are connected so as to form a circulation path as a whole. A wick 33 is provided around the inner surface of the evaporation pipe 32, and eight liquid return pipes 34 are evenly arranged inside the wick 33 while being in contact with the inner peripheral surface of the wick 33. In addition, in the space between the liquid return pipes 34, which are adjacent to each other, the rod-shaped interposition members 35 each having a circular cross section and having substantially the same diameter as the liquid return pipe 34 are provided. The rod-shaped interposer 35 has annular constricted portions 35a formed on the outer periphery at equal intervals in the length direction, and is adjacent to the liquid return pipe 34 so that the constricted portion 35a and the liquid return pipe 34 are separated from each other. A passage 36 is formed in the inner wall of the evaporation pipe 32, and the vapor of the working fluid that has been heated by contacting the inner peripheral surface of the evaporation pipe 32 flows through the passage 36 toward the center of the evaporation pipe 32. The liquid return pipe 34 is provided so that the interposer 35 fills the space and is fixed while being pressed outward by the coil spring type spacer 37 fitted inside.

Therefore, the loop heat pipe 31 of this embodiment can transport heat in the same manner as in both of the above-described embodiments and can keep the distance between the liquid return pipes 34 constant, so that it is as designed. It can be a loop heat pipe having a heat transport capability. In this embodiment, the case where the liquid return pipe 34 and the interposition material 35 are arranged alternately one by one has been described, but two or more interpositions between two adjacent liquid return pipes 34 are described. The member 35 may be interposed, and in this case, the passage 36 is also formed between the adjacent interposed members 35.

[0022]

[Effect of the device]

 As described above, the loop heat pipe of the present invention is a loop heat pipe including a liquid return pipe having a large number of nozzle holes for ejecting the working liquid to the inner surface of the evaporation pipe. The return pipes are arranged close to the inner surface of the evaporation pipe at a predetermined interval so that a vapor flow path along the axial direction is generated in the center of the evaporation pipe, and the steam pipe is placed in the space between the adjacent liquid return pipes. Filling the gap between the liquid return pipes with an interposer having a shape that either has a vapor passage that communicates with the liquid return pipe by itself or that forms a passage that communicates with the liquid return pipe in the radial direction of the vapor pipe. Since the liquid return pipes are arranged as described above, the distance between the liquid return pipes can be kept constant and a predetermined heat transport capacity can be secured.

[Brief description of drawings]

FIG. 1 is a sectional view of an evaporation pipe of a loop heat pipe according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an evaporation pipe of a loop heat pipe according to a second embodiment.

FIG. 3 is a partially cutaway perspective view of an evaporation pipe of a loop heat pipe according to a third embodiment.

FIG. 4 is a sectional view of an evaporation pipe of a conventional loop heat pipe.

[Explanation of symbols]

11 ... Large-capacity loop heat pipe, 12 ... Evaporation pipe,
13 ... Wick, 14 ... Liquid return pipe, 15 ... Air-permeable interposer material, 16 ... Coil spring type spacer,
21 ... Large-capacity loop heat pipe, 22 ... Evaporation pipe, 23 ... Wick, 24 ... Liquid return pipe, 25 ... Venting material, 26 ... Coil spring type spacer, 31 ... Large-capacity loop heat pipe , 32 ...
Evaporation pipe, 33 ... Wick, 34 ... Liquid return pipe, 35 ...
Breathable interposer, 35a ... constriction, 36 ...
Passage, 37 ... Coil spring type spacer.

Front page continuation (72) Creator Koichi Masuko 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd. (72) Shotaro Yoshida 1-1-5, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd. Company (72) Inventor Masataka Mochizuki 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd. (72) Inventor Yuuji Saito 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd.

Claims (1)

[Claim 1] A loop type heat pipe having a liquid return pipe in which a large number of nozzle holes for ejecting a working liquid are formed on the inner surface of an evaporation pipe, wherein the plurality of liquid return pipes are provided. Are arranged 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, and the radius of the steam pipe is set in the space between the adjacent liquid return pipes. Do you have a passage that leads to the direction?
Alternatively, an interposition material having a shape in which a passage communicating with the liquid return pipe in the radial direction of the steam pipe is formed is arranged so as to fill a gap between the liquid return pipes. pipe.