JP2008070058A - Loop type heat pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide high heat exchange efficiency even while simplifying a structure of an evaporator and compactifying it. <P>SOLUTION: The loop type heat pipe 1 is composed of the evaporator 3 carrying out cooling by using latent heat in evaporation of a working liquid, a steam pipe 9 carrying gas evaporated by the evaporator 3, a condenser 11 carrying out heat radiation and liquefaction of the gas from the steam pipe 9, and a liquid return pipe 13 carrying the working liquid liquefied by the condenser 11 to the evaporator. The evaporator 3 is provided at least with a pipe-shaped evaporator body 15 with a front end side communicated with the steam pipe 9 and a rear end side inserted into the liquid return pipe 13 to block it, a wick 17 inserted into an interior of the pipe-shaped evaporator body 15, and a sump part 7. An outgoing passage 23 communicated with the liquid return pipe 13 to carry the working liquid, and an incoming passage 27 communicated with the outgoing passage 23 and connected to the sump part 7 are provided in the wick 17. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a loop heat pipe, and more particularly to a loop heat pipe that can realize a compact size.

  Conventionally, the loop heat pipe 101 (LHP) has a configuration basically similar to that of Patent Document 1 as shown in FIG. 7, for example, and is cooled by using latent heat when the working fluid is vaporized. Evaporator 103, the gas vaporized in the evaporator 103 moves through the vapor pipe 105, dissipates the gas and liquefies it, and the working liquid liquefied by the condenser 107 A reservoir 111 (or an accumulator, a CC (Compensation Chamber), etc.) that moves through the liquid return pipe 109 and reserves to supply the working liquid to the evaporator 103 and returns from the liquid return pipe 109. A bayonet tube 113 for supplying a working fluid to the inside of the evaporator 103, and forming a loop, the evaporator 103 and the reservoir Part 111 is constructed integrally.

  Also, 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 vaporized by the evaporator 103 from returning to the reservoir unit 111. . Further, a working fluid is introduced into the LHP 101. Examples of the hydraulic fluid include alcohol, ammonia, and water. In the CPL (Capillary Pumped Loop), the evaporator 103 and the reservoir unit 111 are configured separately.

  In the LHP 101, when the evaporator 103 is heated by the heat generated in the surroundings, for example, water as a working fluid becomes steam in the evaporator 103, and the ambient temperature at this time is used to cool the ambient temperature. . Vapor generated in the evaporator 103 moves to the condenser 107 through the vapor pipe 105 and is dissipated in the condenser 107, whereby the vapor is returned to water. This water moves again to the reservoir 111 and the evaporator 103 via the liquid return pipe 109, and the above operation is repeated.

  Referring to FIGS. 8 and 9 together, the conventional evaporator 103 includes a cylindrical groove tube 117 having one end side opened and the other end side communicating with the steam tube 105 and closed, and the groove tube 117. And a wick 119 that contacts and inserts the inside of the cylindrical shape and supplies hydraulic fluid to the inside of the cylindrical shape.

  The groove tube 117 is provided with groove portions 121 on the inner peripheral surface of the groove tube 117 which are alternately uneven in the circumferential direction in a cross section perpendicular to the longitudinal direction of the groove tube 117 and extended in the longitudinal direction. ing. On the other hand, the outer peripheral surface of the wick 119 is in contact with the inner peripheral surface of the convex portion 121 </ b> B of the groove portion 121 of the groove tube 117, and the concave portion 121 </ b> A of the groove portion 121 serves as a steam flow path 123.

  The cylindrical interior of the wick 119 forms a liquid storage chamber 125 that communicates with the above-described reservoir 111 and whose front end is closed. In addition, since the bayonet tube 113 communicating with the liquid return pipe 109 is inserted through the reservoir 111 to a little before the front end of the liquid storage chamber 125, the water returned from the liquid return pipe 109 A liquid storage chamber 125 is supplied from the front end of the net tube 113. This water is turned 180 ° from the front end of the bayonet tube 113, passes between the liquid reservoir chamber 125 and the bayonet tube 113 and fills the liquid reservoir chamber 125, and is retained in the reservoir unit 111.

  The wick 119 is made of, for example, a porous sintered metal body, metal fiber, glass fiber or the like.

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 121B of the groove portion 121 to the wick 119, and the wick 119 Is heated. As a result, water that has penetrated from the liquid storage chamber 125 into the wick 119 is heated to become steam, and moves to the steam pipe 105 through the groove portion 121 of the groove pipe 117, that is, the steam flow path 123, as described above. It will be.
JP 2002-174492 A

  By the way, the conventional LHP 101 described above has a problem in that the weight increases because the groove tube 117 and the wick 119 are made of metal. Further, as shown in FIG. 6, the evaporator 103 includes a cylindrical groove tube 117, a cylindrical wick 119 that is inserted in contact with the cylindrical shape of the groove tube 117, and the wick 119 is mainly composed of a reservoir portion 111 that is reserved for supplying hydraulic fluid to the 119 and a bayonet tube 113 that supplies hydraulic fluid into the liquid storage chamber 125 inside the wick 119. There is a problem that the number of parts increases, the structure becomes complicated, and the size becomes large.

  For example, the bayonet tube 113 has no particular function other than securing the flow path of the hydraulic fluid, but is inserted into the liquid storage chamber 125 inside the wick 119, and the thickness of the bayonet tube 113 is that of the space. It requires a volume. Further, since the groove tube 117 and the wick 119 are cylindrical, a space volume is required.

  Further, since the wick 119 is made of metal, it has no elasticity and a gap is likely to be formed at the interface with the convex portion 121B of the groove portion 121, resulting in a problem that heat transfer efficiency is lowered.

  In addition, the size of the reservoir unit 111 greatly affects the cooling performance of the entire system. Since the capacity of the reservoir unit 111 tends to be increased by increasing the outer diameter of the reservoir unit 111, the LHP 101 is In the device to be mounted, there is a problem that a space for storing the reservoir 111 is particularly large in three dimensions.

In order to achieve the problem to be solved by the invention, a loop heat pipe of the invention includes an evaporator that cools using latent heat when the working fluid is vaporized, and a gas that is vaporized by the evaporator. In a loop heat pipe comprising at least a moving steam pipe, a condenser that radiates and liquefies the gas from the steam pipe, and a liquid return pipe that moves the working liquid liquefied by the condenser to the evaporator ,
The evaporator has a pipe-shaped evaporator body whose front end side is in communication with the steam pipe and whose rear end side is closed by inserting the liquid return pipe; and a wick inserted into the pipe-shaped evaporator body; A fluid reservoir, and the wick is provided with an outward path that communicates with the fluid return pipe and through which the working fluid passes, and a return path that communicates with the forward path and communicates with the fluid reservoir. It is.

  In the loop heat pipe of the present invention, it is preferable that the liquid reservoir is provided in the wick in the loop heat pipe.

  In the loop heat pipe of the present invention, in the loop heat pipe, the forward path and the return path are formed from a forward path groove and a return path groove formed in the wick, and an inner wall surface of the evaporator main body. It is preferable.

  In the loop heat pipe of the present invention, it is preferable that a groove is formed in the wick in the loop heat pipe.

  The loop heat pipe of the present invention is preferably arranged such that the forward path of the wick is higher than the return path in the loop heat pipe.

  As can be understood from the means for solving the above problems, according to the loop heat pipe of the present invention, the forward path and the return path through which the working fluid passes through the wick provided in the evaporator body of the evaporator are provided. This eliminates the need to provide a bayonet tube in a conventional evaporator, so that the thickness of the wick itself can be reduced and the number of components can be reduced. It can be made much smaller and can be used in various devices, and it can be cooled with high heat exchange efficiency while being compact. In addition, since water can be absorbed by the two flow paths of the forward path and the return path, the water absorption efficiency can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIG. 1, a loop heat pipe 1 (LHP) according to this embodiment includes an evaporator 3, and this evaporator 3 uses latent heat when the working fluid 5L is vaporized. It has a function of cooling, and a liquid pool portion 7 (corresponding to a conventional reservoir) that holds the hydraulic fluid 5L supplied therein.

  The LHP 1 radiates and liquefies the evaporator 3, the vapor pipe 9 (Vapor Line) that moves the gas 5 V vaporized by the evaporator 3, and the gas 5 V that has moved through the vapor pipe 9. A system comprising a condenser 11 and a liquid return pipe 13 (Liquid Line) that moves 5 L of hydraulic fluid liquefied by the condenser 11 to the evaporator 3 forms a loop. Yes.

  Note that 5 L of hydraulic fluid is introduced into the LHP 1. Examples of the hydraulic fluid 5L include alcohol, ammonia, and water. In this embodiment, the hydraulic fluid 5L is water from the viewpoint of the global environment. In FIG. 1, the flow direction of the water that is the hydraulic fluid 5L is indicated by a solid arrow, and the flow direction of water vapor that is the gas 5V obtained by vaporizing the hydraulic fluid 5L is indicated by a dotted arrow.

  That is, in the LHP 1 described above, when the evaporator 3 is heated by the heat generated in the surroundings, the water that is the hydraulic fluid 5L becomes vapor in the evaporator 3, and the ambient temperature at this time is used to cool the ambient temperature. To do. The steam generated inside the evaporator 3 moves to the condenser 11 through the steam pipe 9 and is dissipated in the condenser 11 to return the steam to water. This water moves again to the evaporator 3 and the liquid pool portion 7 through the liquid return pipe 13, and the above-described operation is repeated. Therefore, LHP1 uses latent heat and has a high heat transport capability without an external power source. Further, the piping of the steam pipe 9 and the liquid return pipe 13 is free, and the heat transmission direction behaves like a diode in one direction from the evaporator 3 to the condenser 11.

  Referring to FIGS. 1 to 4, an evaporator 3 according to an embodiment of the present invention is configured by combining an evaporator main body 15 and a wick 17 and incorporates a liquid pool portion 7.

  The evaporator main body 15 has a pipe shape in which the front end side communicates with the steam pipe 9 and the rear end side is closed by inserting the liquid return pipe 13. In this embodiment, the cross section has a rectangular shape such as a rectangle. It is a pipe shape. The wick 17 is inserted from the front end side inside the pipe shape into the range from the front end side of the pipe shape to the middle of the rear end side, and the remaining cavity portion other than the wick insertion range is formed. Furthermore, when the rear end of the evaporator main body 15 is closed by the lid portion 19, the hollow portion becomes the first liquid pool portion 7A for holding the hydraulic fluid 5L.

  In this embodiment, the evaporator main body 15 is sized to fit a wick 17 to be described later, and the total length is slightly longer than the length of the wick 17. The front end portion of the evaporator main body 15 is connected to the steam pipe 9 by brazing (or soldering), and the rear end portion of the evaporator main body 15 is brazed (or soldered) by the lid portion 19. It is blocked. The lid 19 is provided with a hole 21 into which the liquid return pipe 13 can be inserted as shown in FIG. 4A. The liquid return pipe 13 inserted into the hole 21 is, for example, It is blocked by brazing (or soldering).

  The wick 17 has a cross-sectional shape to be inserted into the pipe shape of the evaporator body 15, that is, a rectangular parallelepiped shape having a rectangular cross section in this embodiment, and the upper side in FIG. 4A of the rectangular parallelepiped shape. On the front surface side, the forward path groove 25 that constitutes a part of the forward path 23 that communicates with the liquid return pipe 13 and passes through the hydraulic fluid 5L, on the front side from the center of the entire length of the wick 17 in the front-rear direction, and the forward path A return path groove 29 that constitutes a part of the return path 27 that communicates with 23 is provided.

  More specifically, the forward groove 25 and the backward groove 29 extend long in the front-rear direction of the wick 17 in a state in which the partition plate portion 31 is provided at substantially the center of the width of the wick 17. The groove 29 is communicated by a communication channel groove 35 that constitutes a part of the communication channel 33 on the front end side of the wick 17, and a so-called U-shaped channel channel is formed as a whole.

  Further, a liquid reservoir groove 37 that constitutes a part of the second liquid reservoir 7B that communicates with the return path 27 is provided on the rear side of the center of the entire length of the wick 17 in the front-rear direction. Note that the inlet 39 of the forward groove 25 is configured such that the tip of the liquid return pipe 13 is connected.

  In this embodiment, the wick 17 has a rectangular cross-sectional dimension of, for example, 5 mm × 15 mm, and the interfacial gap with the inner peripheral surface of the evaporator body 15 is reduced to increase the surface pressure.

  In this embodiment, the wick 17 is made of, for example, a polymer material in order to reduce the weight. As this polymer, for example, a sintered product of polyethylene powder having a diameter of 10 to 20 μm is used. In such a polymer, since each powder has a hydrophilic group, a + α pumping force is added to the wettability and the surface tension. Becomes larger.

  Further, in FIG. 4 (A) of the rectangular parallelepiped shape of the wick 17, that is, on the way from the front end side to the rear end side of the wick 17 as shown in FIGS. 2 and 4 (B). In the cross section perpendicular to the longitudinal direction of the wick 17 in the range up to the above, the concave portion 41A and the convex portion 41B alternately form a concave-convex shape in the width direction of the wick 17, and the concave-convex shape extends in the longitudinal direction of the wick 17. 41 is provided. Further, a groove-less portion 43 that is integrated with the groove portion 41 without forming the groove portion 41 is provided on the back surface of the wick 17. The groove portion 41 is preferably provided in a range equal to or greater than the range in which the forward path groove 25 and the return path groove 29 are provided.

  In this embodiment, the wick 17 has a total length of, for example, 40 mm, a total length of the groove portion 41, for example, 20 mm, and a total length of the non-groove portion 43, for example, 20 mm.

  Further, in this embodiment, the number of the concave portions 41A is six, for example, and the sectional shape of the concave portion 41A is a square shape, but other sectional shapes such as a V-groove shape and a bowl shape may be used. The cross-sectional shape is not limited. That is, the size of the cross-sectional area of the concave portion 41A can be variously set by changing the number, shape, and the like of the concave portion 41A of the groove portion 41.

  Therefore, as shown in FIGS. 1 and 3, when the wick 17 is inserted into the evaporator main body 15, the forward path is formed between the inner surface of the evaporator main body 15 and the forward path groove 25 on the front side of the wick 17. 23 is formed, and the return path 27 is formed by the inner surface of the evaporator body 15 and the return path groove 29. Further, on the rear side of the wick 17, the second liquid pool portion 7 </ b> B is formed by the inner surface of the evaporator body 15 and the liquid pool groove 37.

  When the wick 17 is inserted into the evaporator main body 15, a steam flow path 45 is formed in the groove portion 41 between the recess 41 </ b> A and the inner surface of the evaporator main body 15. Further, by increasing the surface pressure by bringing the gap at the interface between the non-groove portion 43 and the evaporator main body 15 into a small contact, the non-groove portion 43 has a function of preventing the backflow of hydraulic fluid.

  The margin of the gap at the interface between the grooveless portion 43 and the evaporator main body 15 is the difference between the vapor pressure (P) generated by heating the evaporator 3 and the vapor pressure (P ") in the liquid pool portion 7 ( From the surface tension (σ) of PP—) and the hydraulic fluid 5L to the relationship (PP —) <2σ / r (σ: surface tension of water, r: fineness formed by the wick 17 and the evaporator body 15) However, since the polymer body of polyethylene is used as the material of the wick 17, it will be installed without gaps due to the elasticity of the polyethylene. The surface pressure of the interface is kept high.

  This point will be described in more detail. It is desirable that the surface pressure at the interface between the evaporator body 15 and the outer peripheral surface of the non-groove portion 43 of the wick 17 is set to be equal to or higher than the vapor pressure generated in the groove portion 41. . For example, the outer peripheral shape dimension of the non-grooved portion 43 of the wick 17 is formed to be the same as or larger than the inner peripheral shape dimension of the evaporator main body 15, so that the so-called grooveless portion 43 of the wick 17 is formed in the evaporator main body 15. By adopting the press-fitting configuration, the surface pressure at the interface can be increased, so that the backflow of water vapor generated in the groove portion 41 can be suppressed.

  As described above, in this embodiment, the wick 17 is inserted into the evaporator main body 15 in the range from the front end side to the middle of the rear end side of the evaporator main body 15, so that the wick 17 other than the wick insertion range is inserted. The first liquid pool portion 7A described above is formed in the hollow portion, that is, between the rear end of the wick 17 and the lid portion 19 that closes the rear end of the evaporator body 15. That is, the wick 17 is inserted up to a position 10 mm away from the left end of FIG. 1 of the evaporator main body 15 having a total length of 60 mm, for example, and the remaining right 10 mm hollow portion constitutes the first liquid pool portion 7A. Therefore, in addition to the first liquid pool portion 7A, the entire reservoir portion 7 is configured by the second reservoir portion 7B on the rear side of the wick 17.

  The liquid return pipe 13 is inserted into the hole 21 of the lid 19 at the rear end of the evaporator body 15 and then passes through the first liquid pool part 7A. It is connected with the inlet part 39.

  In addition, as a structure of the liquid pool part 7 of other embodiment, what is necessary is just to have at least one of the 1st liquid pool part 7A and the 2nd liquid pool part 7B.

  For example, when the first liquid reservoir 7A is provided, the forward groove 25 and the return groove 29 are provided over the entire length of the wick 17 in the front-rear direction, and the second liquid reservoir 7B is not provided. Good. Alternatively, when the second liquid pool portion 7B is provided in the wick 17, the rear end of the wick 17 abuts against the lid portion 19 at the rear end of the evaporator main body 15 without providing the first liquid pool portion 7A. It can be set as the structure extended. In the latter case, the first liquid reservoir 7A is not present, and the second liquid reservoir 7B and the groove 41 are reliably separated from each other. You may provide the groove part 41 in the whole back surface.

  In this embodiment, the forward path groove 25 and the return path groove 29 are provided on the front surface side of the wick 17, and the groove portion 41 is provided on the back surface side of the wick 17. However, as another embodiment, The forward path 23 and the return path 27 may be provided inside the wick 17, or the forward path 23, the return path 27, and the second liquid pool portion 7B may be provided. That is, the forward path 23 and the return path 27 extending from the rear end side toward the front end side are provided inside the wick 17, and the forward path 23 and the return path 27 are communicated by the communication path 33 at a portion near the front end side of the wick 17. Can be configured. In this case, the above-described groove portion 41 or the groove portion 41 and the non-groove portion 43 may be provided on both the front and back surfaces of the wick 17 or on either the front or back surface.

  In the above-described embodiment, the wick 17 is provided with the groove portion 41, or the groove portion 41 and the non-groove portion 43, but the groove portion 41 or the groove portion 41 is provided on the pipe-shaped inner surface of the evaporator body 15. The groove-less portion 43 is provided, and the groove portion 41 may not be provided on the wick 17.

  The operation of the LHP 1 of this embodiment will be described with the above configuration. As shown in FIG. 1, when the evaporator main body 15 of the evaporator 3 is heated by ambient heat, the evaporator main body 15 and the wick The heat of the evaporator main body 15 is efficiently conducted from the contact surface of the groove portion 41 of the 17 and the wick 17 is heated.

  On the other hand, the water in the liquid reservoir 7 consisting of the forward path 23 and the return path 27 of the wick 17 and the first and second liquid reservoirs 7A and 9B is, as described above, each powder of the polyethylene polymer of the wick 17 is hydrophilic. Therefore, a vacuum is applied by adding a pumping force of + α to the improvement of wettability and surface tension. Since the water inside the wick 17 that has permeated by this evacuation has a reduced pressure, when heated, the water boils at a low boiling point and becomes steam. The ambient temperature is cooled by the latent heat when water becomes steam.

  As described above, the steam is pushed out by the force with which water is evacuated into the polymer body of the wick 17, moves in the polymer body of the wick 17, and flows from the surface of the recess 41 </ b> A of the groove portion 41 to the steam channel 45. It will be.

  Furthermore, the steam in the steam flow path 45 moves to the condenser 11 through the steam pipe 9 as described above, and the steam is returned to the water by being radiated by the condenser 11. This water passes through the liquid return pipe 13 again, reverses 180 ° in the communication path 33 on the front end side of the wick 17 from the forward path 23 of the wick 17 inside the evaporator 3, flows in the return path 27, and flows from the second liquid pool portion 7 B. It will return to the 1 liquid pool part and will be suspended. Then, the above operation is repeated.

  As described above, the evaporator 3 of the LHP 1 according to this embodiment is a device that cools the working fluid 5L by using, for example, water as steam to remove heat, and thus cooling the evaporator 3 using latent heat. Since the capacity is obtained from the product of the evaporation speed of water per unit area and the latent heat of evaporation, the cooling capacity increases as the contact state between the wick 17 and the evaporator body 15 is better and the heat conduction efficiency is higher. In this respect, the gap at the interface between the groove portion 41 and the evaporator main body 15 is in a small contact, and further, for example, by using a polymer body of polyethylene as the material of the wick 17, it is installed without a gap due to the elasticity of polyethylene. Therefore, the heat conduction efficiency between the wick 17 and the evaporator main body 15 is high.

  Further, water vapor generated by heating the groove part 41 should not flow backward to the liquid pool part 7, and the heat of the groove part 41 is conducted through the evaporator main body 15 and is transferred to the liquid pool part 7. The water in the pool 7 should not be changed to water vapor.

  In this respect, in this embodiment, since the wick 17 is provided with the groove portion 41 and the non-groove portion 43, the reverse flow of the steam generated in the groove portion 41 by the non-groove portion 43 is simple in structure. Can be prevented. In addition, as described above, the contact state with the evaporator main body 15 is set without gaps due to the elasticity of the polyethylene of the wick 17, so that the surface pressure at the interface between the non-groove portion 43 and the evaporator main body 15 can be kept high. Therefore, it is possible to reliably prevent steam backflow. In particular, the outer peripheral shape of the grooveless portion 43 of the wick 17 is the same as or larger than the inner peripheral shape of the evaporator main body 15, so that the outer peripheral surface of the evaporator main body 15 and the grooveless portion 43 of the wick 17. Can be set to be equal to or higher than the vapor pressure generated in the groove portion 41, so that it is possible to reliably prevent the vapor backflow.

  Further, the LHP 1 evaporator 3 of this embodiment is provided with the forward path 23 and the return path 27 in the wick 17, so that it is not necessary to provide a bayonet tube in the conventional evaporator. Since the number of constituent members can be reduced, the evaporator 3 of the LHP 1 can be downsized.

  Further, when a bayonet tube is provided as in the conventional evaporator, the hydraulic fluid 5L of only the return path 27 can absorb water into the wick. However, in the LHP1 evaporator 3 according to the embodiment of the present invention, the wick 17 Since the forward path 23 and the return path 27 are provided, water can be absorbed by the two paths of the forward path 23 and the return path 27, so that the water absorption efficiency can be improved.

  Further, when the second liquid pool portion 7B is provided inside the wick 17, it is not necessary to provide another first liquid pool portion 7A inside the evaporator main body 15, so that the components can be simplified. . In addition, since it is not necessary to provide the groove-less portion 43 in the wick 17, the components can be simplified and the area of the groove portion 41 can be increased, so that the water absorption efficiency can be improved.

  Further, the forward path groove 25, the return path groove 29, and the communication path groove 35 are provided on the surface side of the wick 17 having a rectangular parallelepiped shape, and the forward path groove 25, the return path groove 29, the communication path groove 35, and the evaporator main body. 15, the forward path 23, the return path 27, and the communication path 33 are formed, and the groove portion 41 is formed between the back surface of the wick 17 and the evaporator body 15, so that the evaporator 3 can be further thinned. Further, the evaporator 3 can be further downsized.

  Moreover, since the thickness of the evaporator main body 15 can be made uniform thinly by providing the groove part 41 in the wick 17, especially when providing the groove part 41 in the single side | surface side of the wick 17 which makes a rectangular parallelepiped shape. The evaporator 3 can be further thinned, and the evaporator 3 can be further reduced in size. Incidentally, when the groove part 41 is provided in the evaporator main body 15, the evaporator main body 15 itself becomes thick. In addition, when the groove portion 41 is provided only on the side that comes into contact with one side of the wick 17, the side that comes into contact with the opposite surface of the wick 17 does not have the groove portion 41, so that the wall thickness increases. Even if the side where the groove portion 41 is not provided is thinned, the workability of the evaporator main body 15 is deteriorated.

  Moreover, since the liquid reservoir 7 is housed in the evaporator 3, the LHP 1 using the evaporator 3 is far more than a conventional LHP provided with a separate evaporator and a liquid reservoir. Can be made compact.

  Therefore, the LHP 1 using the evaporator 3 according to this embodiment is used for cooling the heat generated by, for example, OA devices such as notebook computers, digital home appliances, automobile dashboards, and various other devices. Cooling with high heat exchange efficiency can be performed while being a compact size.

  Next, an LHP 47 according to another embodiment of the present invention will be described with reference to the drawings. Since it is almost the same as the LHP 1 of the above-described embodiment, only different parts will be mainly described, the same members are denoted by the same reference numerals, and detailed description will be omitted.

  Referring to FIG. 5, this LHP 47 is different from the aforementioned LHP 1 in that the evaporator 3 is arranged so that the forward path 23 of the wick 17 is higher than the return path 27. Others are the same as LHP1 of embodiment mentioned above.

  Thus, when the evaporator main body 15 of the evaporator 3 of the LHP 47 of this embodiment is heated by ambient heat, the heat of the evaporator main body 15 is released from the contact surface between the evaporator main body 15 and the groove portion 41 of the wick 17. The wick 17 is heated by conducting heat efficiently. At this time, the heating temperature on the upper side in FIG. 5 of the wick 17 is higher than that on the lower side, but since the forward path 23 is higher than the return path 27, the cold hydraulic fluid 5L supplied from the liquid return pipe 13 is forwarded. By flowing to the lower return path 27 after flowing to 23, the upper side of the wick 17 is effectively cooled from the lower side. As a result, the wick 17 is evacuated as evenly as possible on the upper side and the lower side to absorb water. Other effects are the same as those of the LHP 1 of the above-described embodiment.

  FIG. 6 shows another embodiment in place of FIG. In the loop heat pipe 49 in FIG. 6, it is possible to cope with the case where the position of the wick 17 in the evaporator main body 15 in FIG. 1 is inserted upside down. Since other than that is the same, detailed description is abbreviate | omitted.

It is a schematic front view of the loop type heat pipe using the evaporator of embodiment of this invention. It is sectional drawing of the arrow II-II line | wire of FIG. It is a schematic perspective view of the evaporator of embodiment of this invention. (A) is an exploded view of the evaporator of FIG. 3, and (B) is a perspective view of the wick of (A) as viewed from the back side. It is a schematic front view of the loop type heat pipe of other embodiment. It is a schematic front view of the loop type heat pipe of other embodiment instead of FIG. It is a schematic front view of the conventional loop type heat pipe. It is a schematic perspective view containing the principal part cross section of the conventional evaporator. It is sectional drawing of the arrow IX-IX line | wire of FIG.

Explanation of symbols

1 Loop heat pipe (LHP)
3 Evaporator 5L Working fluid (liquid)
5V gas (vaporized hydraulic fluid)
7 Liquid pool part 7A 1st liquid pool part 7B 2nd liquid pool part 9 Steam pipe 11 Condenser 13 Liquid return pipe 15 Evaporator main body 17 Wick 19 Lid part 23 Outward path 25 Outward groove 27 Return path 29 Return path groove 31 Partition plate Portion 33 Communicating passage 35 Communicating passage groove 37 Liquid pool portion groove 41 Groove portion 41A Concavity 41B Convex portion 43 No groove portion 45 Steam passage 47 Loop heat pipe (LHP)
49 Loop heat pipe (LHP)

Claims (5)

An evaporator that cools using the latent heat generated when the hydraulic fluid is vaporized, a vapor pipe that moves the gas vaporized in the evaporator, a condenser that radiates and liquefies the gas from the vapor pipe, and this In a loop heat pipe comprising at least a liquid return pipe for moving the working liquid liquefied in the condenser to the evaporator,
The evaporator has a pipe-shaped evaporator body whose front end side is in communication with the steam pipe and whose rear end side is closed by inserting the liquid return pipe; and a wick inserted into the pipe-shaped evaporator body; A loop that includes at least a liquid reservoir, and the wick includes a forward path that communicates with the liquid return pipe and through which the working fluid passes, and a return path that communicates with the forward path and communicates with the liquid reservoir. Type heat pipe.   The loop heat pipe according to claim 1, wherein the liquid reservoir is provided in the wick.   The loop heat pipe according to claim 1 or 2, wherein the forward path and the return path are formed by a forward path groove and a return path groove formed in the wick, and an inner wall surface of the evaporator body. .   The loop heat pipe according to claim 1, 2, or 3, wherein a groove is formed in the wick.   The loop heat pipe according to claim 1, 2, 3, or 4, wherein the wick forward path is disposed at a position higher than the return path.

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