JP2008215702A - Loop-type heat pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a loop-type heat pipe which exerts prescribed functions without degrading its performance even when an evaporator is vertically disposed or disposed on a bent portion. <P>SOLUTION: In this loop-type heat pipe comprising: the evaporator 103 for evaporating operating fluid; a condenser 107 for liquefying the evaporated gas; a vapor pipe 105 connected from the evaporator 103 to the condenser 107; a fluid return pipe 109 connected from the condenser 107 to the evaporator 103; and a reservoir portion 111 for reserving the operating fluid to be supplied to the evaporator 103 before the evaporator 103, the evaporator 103 comprises: a groove pipe 117 opened at its one end side and closed at the other end side by being communicated with the vapor pipe 105; a wick 119 inserted into the groove pipe 117; and a bayonet pipe 113 for supplying the operating fluid to the inside of the wick 119 and the reservoir portion 111, and at least a part of an inner wall surface of the reservoir portion 111 is provided with a water absorbing member 120 absorbing the operating fluid. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a loop heat pipe such as a loop heat pipe (LHP) and a capillary pump loop (CPL).

  Known types of loop heat pipes include a loop heat pipe (LHP) and a capillary pump loop (CPL).

  For example, as shown in FIG. 3, the LHP 101 is composed of an evaporator 103 that cools by using latent heat when evaporating and evaporating a working fluid such as water, alcohol, and ammonia, and the evaporator 103 vaporizes the LHP 101. The condenser 107 that dissipates the liquefied gas to liquefy it, the vapor pipe 105 that sends the gas vaporized by the evaporator 103 to the condenser 107, and the working fluid liquefied by the condenser 107 A liquid return pipe (Liquid Line) 109 to be sent to the evaporator 103, and a reservoir unit 111 [accumulator, CC (Compensation Chamber) for holding hydraulic fluid supplied to the evaporator 103 via the liquid return pipe 109 in front of the evaporator 103 ) Etc.]. In the system of FIG. 3, a bayonet tube 113 for feeding the working fluid into the evaporator 103 is provided at the tip of the liquid return tube 109. Further, the evaporator 103 and the reservoir unit 111 are integrally formed.

  In addition, an O-ring 115 for preventing backflow of hydraulic fluid is installed between the evaporator 103 and the reservoir unit 111 to prevent the gas evaporated by the evaporator 103 from returning to the reservoir unit 111. Note that the hydraulic fluid introduced into the LHP 101 includes water, alcohol, ammonia, and the like.

  In the LHP 101 having such a configuration, when the evaporator 103 is heated by the heat generated in the surroundings, the working fluid is vaporized in the evaporator 103, and the ambient temperature is cooled by the latent heat at this time. Vapor generated in the evaporator 103 moves to the condenser 107 through the vapor pipe 105 and is radiated by the condenser 107, whereby the vapor is returned to the liquid. This liquid moves again to the reservoir 111 and the evaporator 103 via the liquid return pipe 109, and repeats the above operation.

  The condenser 107 has a configuration in which a large number of fins 107B are provided in parallel on the outer periphery of a conduit 107A through which the steam pipe 105 and the liquid return pipe 109 communicate.

  Further, the evaporator 103 basically has a structure similar to the principle shown in, for example, Patent Document 1, and is open at one end side and is closed by communicating with the steam pipe 105 at the other end side. A cylindrical groove tube 117 and a wick 119 that forms a cylindrical shape that is inserted in contact with the cylindrical shape of the groove tube 117 and supplies hydraulic fluid to the cylindrical shape are provided.

  In addition, on the inner peripheral surface of the groove tube 117, a groove portion 121 is provided which has an uneven shape alternately in the circumferential direction in the cross section perpendicular to the longitudinal direction of the groove tube 117 and extends in the longitudinal direction. On the other hand, the outer peripheral surface of the wick 119 is configured to come into contact with the inner peripheral surface of the convex portion of the groove portion 121 of the groove tube 117, and the concave portion of the groove portion 121 serves as a steam flow path 123.

  In addition, the cylindrical interior of the wick 119 is configured as a liquid storage chamber 125 that communicates with the above-described reservoir unit 111 and whose front end is closed. Further, the bayonet tube 113 communicating with the liquid return tube 109 is inserted through the inside of the reservoir unit 111 to a little before the front end portion of the liquid storage chamber 125. As a result, the hydraulic fluid returned from the liquid return pipe 109 is supplied to the liquid storage chamber 125 from the front end of the bayonet pipe 113, and is inverted 180 ° from the front end of the bayonet pipe 113 so that the liquid storage chamber 125 and the bayonet pipe 113, the liquid storage chamber 125 is filled, and is held in the reservoir 111.

  Therefore, when the groove tube 117 is heated by the heat around the evaporator 103, the heat of the groove tube 117 is conducted from the contact portion with the inner peripheral surface of the convex portion of the groove portion 121 to the wick 119, and the wick 119 is As a result, the hydraulic fluid that has penetrated into the wick 119 from the liquid storage chamber 125 is heated to become a gas, and passes through the groove portion 121 of the groove tube 117, that is, the steam channel 123, as described above. Will be moved to.

  For the wick 119, for example, a porous sintered metal body, a metal fiber, a glass fiber, a polymer body such as polyethylene, or the like is used.

However, as described above, in the loop type heat pipe in which the reservoir unit 111 is integrally formed with the evaporator 103, when the evaporator 103 is installed vertically as shown in FIG. 4, or as shown in FIG. When the evaporator 103 is installed in the part, the evaporator 103 is located on the upper side and the reservoir part 111 is located on the lower side, so that the inner wall surface 111a of the upper half part of the reservoir part 111 is in a liquid-depleted state. Cheap. For this reason, the temperature of the reservoir unit 111 rises due to the influence of heat from the evaporator 103. As a result, the performance of the heat pipe may be reduced, or in the worst case, the operation may be stopped.
JP 2004-53062 A

  In view of the above circumstances, the present invention provides a loop heat pipe that can exhibit a predetermined function without degrading performance even when the evaporator is installed vertically or in a bent portion. With the goal.

  According to one aspect of the present invention, an evaporator that cools by using latent heat when the working fluid is evaporated and vaporized, a condenser that dissipates and liquefies the gas vaporized by the evaporator, and an evaporator. A vapor pipe that connects the condenser and sends the gas vaporized by the evaporator to the condenser, a liquid return pipe that connects the condenser and the evaporator and sends the working liquid liquefied by the condenser to the evaporator, and evaporation In a loop heat pipe provided at the end of the evaporator, and having a reservoir section that holds the working liquid liquefied by the condenser and supplied to the evaporator via the liquid return pipe before the evaporator, the evaporator is A groove tube that opens at one end and is closed by communicating with the steam tube at the other end; a wick inserted into the groove tube; and a bayonet tube that supplies a working fluid to the inside of the wick and the reservoir. At least part of the inner wall surface of the reservoir. And summarized in that the water-absorbing member to absorb water liquid is loop heat pipe is disposed.

  ADVANTAGE OF THE INVENTION According to this invention, even when installing an evaporator vertically or when installing in a bending part, the loop type heat pipe which enabled it to exhibit a predetermined function can be provided, without reducing performance.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in light of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(First embodiment)
FIG. 1 shows a schematic configuration of a main part of a loop heat pipe according to a first embodiment of the present invention. Since the overall configuration of the loop heat pipe according to the first embodiment is substantially the same as that shown in FIG. 3, the overall configuration will be briefly described with reference to FIG.

  The loop heat pipe according to the first embodiment liquefies the evaporator 103 that cools by using latent heat when the working liquid is evaporated and vaporizes, and releases the gas vaporized by the evaporator 103 to liquefy. The condenser 107, the evaporator 103 and the condenser 107 are connected, the vapor pipe 105 for sending the gas vaporized by the evaporator 103 to the condenser 107, the condenser 107 and the evaporator 103 are connected, and the condenser 107 A liquid return pipe 109 that sends the liquefied hydraulic fluid to the evaporator 103, and a hydraulic fluid that is provided at the end of the evaporator 103, is liquefied by the condenser 107, and is supplied to the evaporator 103 via the liquid return pipe 109. And a reservoir unit 111 that is reserved in front of the evaporator 103. The evaporator 103 includes a groove tube 117 that opens at one end and is closed by communicating with the steam tube 105 at the other end, a wick 119 inserted into the groove tube 117, the inside of the wick 119, and the reservoir unit 111. And a bayonet tube 113 for supplying a working fluid to the tube.

  In this loop heat pipe, as a characteristic point, as shown in FIG. 1, a water absorbing member that absorbs hydraulic fluid is provided on at least a part of the inner wall surface 111a of the reservoir portion 111 that is likely to be drought. 120. As the water absorbing member 120, the same member as the wick 119 that can supply liquid (working fluid) such as water, alcohol, ammonia, or the like is used. The water absorbing member 120 is in contact with the inner wall surface 111a of the reservoir portion 111, thereby playing a role of connecting the working fluid in the reservoir to the inner wall surface 111a.

  In the case of the loop heat pipe according to the first embodiment, a part of the wick 119 is extended into the reservoir unit 111 and used as the water absorbing member 120. As a material of the wick 119, a porous sintered metal body, a metal fiber, a glass fiber, a polymer body such as polyethylene, or the like can be used.

  According to the loop heat pipe according to the first embodiment, since the water absorbing member 120 is provided so as to contact the inner wall surface 111a of the reservoir unit 111, even if the evaporator 103 is installed vertically, Since the inner wall surface 111a of the reservoir 111 can be kept wet with the working fluid at all times, it is possible to prevent the liquid from being depleted. Therefore, it is possible to prevent the reservoir unit 111 from being heated due to the influence of heat from the evaporator 103, and to avoid the performance degradation and the worst case operation stop due to the reservoir unit 111 being heated. it can.

Further, as in the case of the loop heat pipe according to the first embodiment, when a part of the wick 119 inserted into the groove tube 117 is extended into the reservoir portion 111 and used as the water absorbing member 120, By only changing the shape of the wick 119, the above-described effects can be achieved without increasing the number of parts (second embodiment).
FIG. 2 shows a schematic configuration of a main part of a loop heat pipe according to the second embodiment of the present invention. Since the evaporator 103 of this loop heat pipe is provided at the bent portion, the shape of the reservoir portion 111 is slightly complicated.

  A characteristic point of this loop type heat pipe is that a water absorbing member 122 is provided inside the curved reservoir portion 111 so as to be in contact with the inner wall surface 111a that is prone to drought. In this case, the water absorbing member 122 is provided as a separate member from the wick 119. Specifically, a highly water-absorbing resin such as a nonion / sulfonic acid resin, an acrylic acid resin, and an acrylate resin can be used.

  According to the loop heat pipe according to the second embodiment, since the water absorbing member 122 is provided so as to be in contact with the inner wall surface 111a of the reservoir unit 111, even if the evaporator 103 is installed at the bent part. Since the inner wall surface 111a of the reservoir 111 can be kept wet with the working fluid at all times, it is possible to prevent the liquid from being depleted. Therefore, it is possible to prevent the reservoir unit 111 from being heated due to the influence of heat from the evaporator 103, and to avoid the performance degradation and the worst case operation stop due to the reservoir unit 111 being heated. it can.

  Further, according to the loop heat pipe according to the second embodiment, the water absorbing member 122 disposed in the reservoir unit 111 is formed separately from the wick 119, and thus the evaporator 103 is particularly formed in the bent portion. The degree of freedom of design when installing the can be increased. That is, when the evaporator 103 is installed at the bent portion, the shape of the reservoir portion 111 tends to be complicated, but even in that case, the performance by heating the reservoir portion 111 while ensuring the degree of freedom of design. The effect of avoiding the lowering or the operation stop in the worst case can be obtained.

It is sectional drawing which shows the principal part schematic structure of the loop type heat pipe which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the principal part schematic structure of the loop type heat pipe which concerns on the 2nd Embodiment of this invention. It is a figure which shows the whole structure of a loop type heat pipe. It is principal part sectional drawing used for description of the conventional problem in case an evaporator is installed vertically. It is principal part sectional drawing used for description of the conventional problem in case an evaporator is installed in the bending part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 ... Loop type heat pipe 103 ... Evaporator 105 ... Steam pipe 107 ... Condenser 107A ... Pipe line 107B ... Fin 109 ... Liquid return pipe 111 ... Reservoir part 111a ... Inner wall surface 113 ... Bionet pipe 115 ... O-ring 117, 121 ... Groove tube 119 ... Wick 120, 122 ... Water absorbing member 123 ... Steam flow path 125 ... Liquid storage chamber

Claims (3)

An evaporator that cools using the latent heat generated when the hydraulic fluid is evaporated and vaporized;
A condenser that radiates and liquefies the gas vaporized in the evaporator;
A steam pipe connecting the evaporator and the condenser, and sending the gas vaporized in the evaporator to the condenser;
A liquid return pipe that connects the condenser and the evaporator, and sends the working liquid liquefied by the condenser to the evaporator;
A loop heat pipe provided at an end of the evaporator, and a reservoir section that holds the working liquid liquefied by the condenser and supplied to the evaporator through the liquid return pipe before the evaporator In
The evaporator operates in a groove tube that opens at one end side and closes the other end side in communication with the steam tube, a wick inserted into the groove tube, the inside of the wick, and the reservoir unit. A bayonet tube for supplying liquid,
A loop type heat pipe, wherein a water absorbing member that absorbs hydraulic fluid is disposed on at least a part of an inner wall surface of the reservoir portion.   The loop heat pipe according to claim 1, wherein a part of the wick is extended into the reservoir portion and used as the water absorbing member.   The loop-type heat pipe according to claim 1, wherein the water absorbing member is provided as a separate member from the wick.

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