JP2014222124A - Heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pipe of high heat exchanger effectiveness.SOLUTION: A heat pipe includes a heat receiving portion 3 receiving heat from the external 2, a heat radiating portion 5 radiating heat to the external 4, a steam pipe 6 disposed over the heat receiving portion 3 and the heat radiating portion 5 to allow steam flow F obtained by evaporating a working fluid L1 at the heat receiving portion 3, to flow toward the heat radiating portion 5, and a recirculation pipe 7 to allow a condensed fluid L2 obtained by condensing the steam flow F at the heat radiating portion 5, to flow toward the heat receiving portion 3. The steam pipe 6 and the recirculation pipe 7 are arranged at an interval, and one end portion 6a of the steam pipe 6 and one end portion 7a of the recirculation pipe 7, and the other end portion 6b of the steam pipe 6 and the other end portion 7b of the recirculation pipe 7 are respectively connected by headers 8, 9.

Description

  The present invention relates to a heat pipe.

  As a conventional heat pipe, for example, there is one in which a wick is arranged on the inner wall surface of a cylindrical container, and a working fluid is enclosed as a heat receiving portion that receives heat from the outside of one of the containers and a heat radiating portion that radiates the other to the outside ( For example, the following patent document 1). This heat pipe heats and evaporates the working fluid in the heat receiving part and moves it as a vapor flow to the heat radiating part. I am letting. Then, heat exchange of the heat pipe is performed by latent heat of evaporation and condensation during circulation of the hydraulic fluid.

JP-A-62-252892

By the way, in the above conventional heat pipe, the wick is arranged on the inner wall surface of the container, the vapor flow flows from the heat receiving portion to the heat radiating portion through the flow path inside the wick, and the condensate flows in the flow of the vapor flow. The inside of the wick facing the road flows from the heat radiating portion toward the heat receiving portion. Therefore, where the evaporative stream or condensate should exchange heat only with the outside in the heat radiating part or heat receiving part, heat exchange also takes place between the vapor stream flowing inside the wick and the condensate flowing inside the wick. Therefore, there was a problem that the heat exchange rate was poor.
Then, this invention makes it a subject to provide a heat pipe with a high heat exchange rate in view of the said subject.

The present invention is arranged so as to straddle between a heat receiving portion that receives heat from the outside, a heat radiating portion that radiates heat to the outside, and the heat receiving portion and the heat radiating portion, and a vapor flow obtained by evaporating the working fluid in the heat receiving portion. A steam pipe that flows toward the heat radiating section, and a reflux pipe that flows a condensate obtained by condensing the vapor flow in the heat radiating section toward the heat receiving section, the steam pipe and the reflux pipe, One end of the steam pipe and one end of the reflux pipe, and the other end of the steam pipe and the other end of the reflux pipe are respectively arranged by headers. It is connected.
According to the configuration in which the steam pipe and the reflux pipe of the present invention are spaced apart from each other, contact between the steam pipe and the reflux pipe, and hence contact between the steam flow and the condensate is avoided, and It is possible to prevent heat exchange from occurring.

A plurality of the steam pipes and the reflux pipes of the present invention may be provided and arranged alternately.
According to this configuration, since the steam pipes and the reflux pipes are alternately arranged, the circulation efficiency of the steam flow and the condensate can be increased.

At least one end of the one end or the other end of the steam pipe of the present invention or the one end or the other end of the reflux pipe is directed to the header. The inner hole may be formed in a tapered shape that gradually expands.
According to this configuration, at least one of taking in the vapor flow of the vapor pipe or discharging the vapor flow from the vapor pipe or taking in the condensate into the reflux pipe or discharging the condensate from the reflux pipe becomes easy. .

In the present invention, a plurality of units formed by arranging the steam pipe and the reflux pipe on one plane may be provided, and each unit may be stacked with the one plane directed in one direction.
According to this configuration, the heat exchange efficiency can be easily adjusted by laminating a plurality of unit heat pipes formed on one plane.

  According to the present invention, there is an effect that the efficiency of heat exchange of the heat pipe can be improved.

It is the top view which showed the heat pipe shown as 1st Embodiment of this invention. It is the top view which showed the heat pipe shown as 2nd Embodiment of this invention. It is the top view which showed the heat pipe shown as 3rd Embodiment of this invention.

Hereinafter, an embodiment of a heat pipe according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the heat pipe 1 </ b> A according to the first embodiment of the present invention includes a heat receiving unit 3 that receives heat from the outside 2, a heat radiating unit 5 that radiates heat to the outside 4, and a space between the heat receiving unit 3 and the heat radiating unit 5. The steam pipe 6 disposed so as to straddle, the reflux pipe 7 disposed so as to straddle between the heat receiving part 3 and the heat radiating part 5, one end 6a of the steam pipe 6 and one of the reflux pipes 7. Headers 8 and 9 for connecting the end 7a, the other end 6b of the steam pipe 6 and the other end 7b of the reflux pipe 7, respectively, and a hydraulic fluid L1 for exchanging heat with the exteriors 2 and 4 are provided. .

The exteriors 2 and 4 in the present invention mean everything outside the heat pipe 1A to be subjected to heat exchange, such as a heating element composed of a semiconductor element or the like, outside air, hot water, cold water or the like.
The steam pipe 6 is a pipe in which both end portions 6 a and 6 b are opened, one end portion 6 a is connected to a header 8 that receives heat from the outside 2, and the other end portion 6 b is a header that radiates heat to the outside 4. 9 is connected.

The inner hole 6h of the steam pipe 6 has an inner diameter dimension capable of flowing a steam flow evaporated and expanded by heat exchange with the outside 2 of the hydraulic fluid L1 in the heat receiving portion 3.
Both end portions 6a and 6b of the steam pipe 6 are formed in a tapered shape that gradually expands toward the headers 8 and 9, respectively.

The reflux pipe 7 is a pipe in which both end portions 7 a and 7 b are opened. Like the steam pipe 6, one end portion 7 a is connected to a header 8 that receives heat from the outside 2, and the other end portion 7 b is connected to the outside 4. It is connected to a header 9 that dissipates heat.
Both end portions 7a and 7b of the reflux pipe 7 are formed in a tapered shape that gradually expands toward the headers 8 and 9, respectively.
The inner hole 7h of the reflux pipe 7 is formed to have an inner diameter that generates a capillary action.

The headers 8 and 9 connect one end portions 6 a and 7 a of the steam pipe 6 and the reflux pipe 7 and the other end portions 6 b and 7 b of the steam pipe 6 and the reflux pipe 7, respectively. This is a pipe joint for communicating the holes 6h and 7h.
At this time, the flow path width of the header 8 may be increased and the flow path width of the header 9 may be decreased. That is, it is desirable that the inner diameter of the header 9 is smaller than the inner diameter of the reflux pipe 7 except for the connection portion with the end portion 6b of the steam pipe 6 to generate a sufficient capillary action, while the inner diameter of the header 8 is the same. It is desirable that the capillary action of the reflux tube 7 is not hindered.
As the material of the headers 8 and 9, metal such as aluminum alloy having high heat conductivity, lead, copper alloy, silver or the like is adopted, and heat is absorbed from the outside or radiated to the outside. The working fluid L1, the vapor flow F or the condensate L2 can be evaporated or radiated.

  In the above configuration, the header 8 that receives heat from the outside 2 (one end 6a, 7a of the steam pipe 6 and the reflux pipe 7 also receives one end 6a of the steam pipe 6 and the reflux pipe 7 when receiving heat from the outside 2). , 7a), the heat receiving part 3 is constituted. In addition, the header 9 that radiates heat to the outside 4 (the other end portions 6b and 7b of the steam pipe 6 and the reflux pipe 7 also has the other end portions 6b and 7b of the steam pipe 6 and the reflux pipe 7 when radiating heat to the outside 4). The heat dissipating part 5 is configured.

Moreover, as the material of the steam pipe 6 and the reflux pipe 7, a resin material having flexibility and gas barrier properties is preferably employed. Examples of such resin materials include polyvinylidene chloride, polycarbonate, polyamide, polyethylene terephthalate, epoxy resin, poly vinyl alcohol, ethylene-vinyl alcohol copolymer, or polypropylene, polyethylene, polyethylene terephthalate whose inner wall surface is vapor-deposited. And other resin materials.
In this embodiment, the steam pipe 6, the reflux pipe 7 and the headers 8 and 9 are fixed on a flexible flat resin substrate 10.

  As the hydraulic fluid L 1, a liquid such as water, ethanol, or ammonia water is used, and is enclosed in the header 8.

Next, the usage method and effect | action of 1 A of heat pipes of this embodiment are demonstrated.
The header 8 of the heat pipe 1A is disposed on the outside 2 where heat can be absorbed or desired to be absorbed, and the header 9 is disposed on the exterior 4 where heat can be radiated or desired to be dissipated.

  When the heat receiving unit 3 receives heat, the hydraulic fluid L1 enclosed in the header 8 exchanges heat with the outside 2, that is, absorbs heat. Then, it evaporates by the heat obtained from the outside 2 to become a vapor flow F and moves toward the heat radiating section 5. The vapor flow F that has flowed to the heat radiating portion 5 is condensed by exchanging heat with the outside 4 in the heat radiating portion 5, that is, by radiating heat to the outside 4, and becomes a condensate L2.

  That is, when the working fluid L1 evaporates and expands, the pressure in the end portion 6a on the heat receiving portion 3 side of the steam pipe 6 increases, and the steam flow F dissipates in the heat radiating section 5 to condense and condense. The pressure in the end portion 6b on the heat radiating portion 5 side is reduced. Due to this pressure difference, the steam flow F flows in the steam pipe 6 from the heat receiving part 3 side toward the heat radiating part 5 side.

The condensate L2 in which the vapor flow F is condensed by radiating heat in the heat radiating section 5 is drawn into the reflux pipe 7 by the capillary action generated in the reflux pipe 7, and flows from the heat radiating section 5 toward the heat receiving section 3. . When the condensate L2 reaches the heat receiving portion 3, it is heated again, evaporates and expands, and becomes a vapor flow F and flows again in the vapor pipe 6.
In this way, the working fluid L1 is repeatedly circulated in the heat pipe 1A with the steam flow F, the condensate L2, the steam flow F,..., And the steam flow F and the condensate L2 are externally transmitted to the heat receiving unit 3 and the heat radiating unit 5. Exchange heat with 2 and 4.

  At this time, the steam pipe 6 and the reflux pipe 7 are arranged with a space therebetween. Therefore, heat exchange does not occur between the steam flow F flowing in the steam pipe 6 and the condensate L2 flowing in the reflux pipe 7, and the steam flow F and the condensate L2 are received by the heat receiving section 3 and the heat radiating section. In each of 5, heat exchange is efficiently performed between the outside 2 and 4.

  Therefore, according to the heat pipe 1A, heat exchange between the steam flow F flowing in the steam pipe 6 and the condensate L2 flowing in the reflux pipe 7 is effectively prevented, and The effect that heat can be efficiently exchanged between the two is obtained.

  In addition, the heat pipe 1A has a configuration in which the steam pipe 6 and the reflux pipe 7 are provided separately and arranged at intervals, so that a wick or the like is disposed in the container like a conventional heat pipe, for example, and condensed. It is possible to avoid taking a complicated configuration of forming a liquid flow path. That is, since the structure of the heat pipe 1A is simple, the effect that the heat pipe 1A can be manufactured easily and inexpensively is obtained.

  Further, in the conventional heat pipe configuration, since a wick must be arranged in the container, there is a limit to downsizing the entire heat pipe. For this reason, conventional heat pipes are difficult to apply to precision instruments and the like, and their use as heat exchange devices has been limited. However, according to the heat pipe 1A, since the steam pipe 6 and the reflux pipe 7 are arranged at intervals and are connected by the headers 8 and 9, the effect is that the downsizing is easy and the application is wide. can get.

Further, since a simple configuration in which the steam pipe 6 and the reflux pipe 7 are connected by the headers 8 and 9 is adopted, the steam pipe 6 and the reflux pipe 7 can be easily added. Therefore, it is possible to easily produce various types of heat pipes 1A having different heat exchange capacities.
In addition, since the capillary tube action is generated by setting the cross-sectional area of the inner hole 7h of the reflux pipe 7 to a small size, an effect that the flow path of the condensate L2 can be easily formed is obtained.

Further, since the end portions 6a and 6b of the steam pipe 6 are formed in a tapered shape, the steam pipe 6 takes in the steam flow F between the header 8 on the heat receiving portion 3 side and the header 9 on the heat radiating portion 5 side. Or it is easy to discharge.
Further, since the end portions 7a and 7b of the reflux pipe 7 are formed in a tapered shape, the reflux pipe 7 takes in the condensate L2 between the header 8 on the heat receiving portion 3 side and the header 9 on the heat radiating portion 5 side. Or it is easy to discharge.
Therefore, according to the heat pipe 1A, since the flow of the steam flow F and the condensate L2 is performed smoothly, an effect that the circulation efficiency of the working fluid L1 is increased can be obtained.

Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and configurations, operations, and effects different from those in the first embodiment are described.
The heat pipe 1B of the present embodiment is provided with a plurality of steam pipes 6 and reflux pipes 7, and these are alternately arranged in parallel on one plane 10a. The headers 8 and 9 connect the end portions 6a..., 7a... And the end portions 6b.

  According to this configuration, the working fluid L1 is evaporated in the header 8 on the heat receiving unit 3 side to form a vapor flow F, and after flowing in the steam pipe 6, it is condensed by heat dissipation in the header 9 on the heat radiating unit 5 side. The condensate L2 can be quickly flowed into the reflux pipe 7 arranged adjacent to the steam pipe 6. In addition, the steam flow F that flows in the reflux pipe 7 toward the heat receiving portion 3, flows into the header 8, is heated again and evaporated, and quickly flows into the steam pipe 6 arranged adjacent to the reflux pipe 7. Can be made.

  Therefore, the heat exchange capacity can be easily increased by the plurality of alternately arranged steam pipes 6 and the reflux pipes 7, and the circulation efficiency of the steam flow F or the condensate L2 can be improved. Further, since the steam pipes 6 and the reflux pipes 7 are alternately arranged at equal intervals, an effect that heat exchange can be performed uniformly at the place where the heat pipe 1B is arranged is obtained.

Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same components as those of the second embodiment are denoted by the same reference numerals, the description thereof is omitted, and configurations, operations, and effects different from those of the second embodiment are described.
As in the second embodiment, the heat pipe 1C of the present embodiment includes a plurality of units 20 formed by alternately arranging the steam pipes 6 and the reflux pipes 7, and the plurality of units 20, 20,. The one plane 10a is laminated in one direction X.

  According to this structure, the effect that the heat exchange capability of the heat pipe 1 </ b> C can be easily set by the number of stacked units 20 is obtained.

  The heat pipes 1A to 1C of the first to third embodiments shown in FIGS. 1 to 3 are all formed on one plane 10a, but the heat pipes 1A to 1C of the present invention are It is not limited to what is formed on the plane 10a. That is, heat pipe 1A-1C arrange | positions heat pipe 1A-1C by using a flexible film-like board | substrate as the resin substrate 10 which fixes the steam pipe 6, the reflux pipe 7, and the headers 8 and 9. FIG. You may arrange | position by making it curve or bend | fold according to the shape of object.

  Alternatively, the steam pipe 6, the reflux pipe 7 and the headers 8 and 9 are formed of a flexible material, and are not fixed to the resin substrate 10, but are curved according to the shape of the target for arranging the heat pipes 1 </ b> A to 1 </ b> C. Alternatively, it may be bent.

  Further, the opening portions of the headers 8 and 9 may be opened and closed using a lid member (not shown), and the headers 8 and 9 and the steam pipe 6 and the reflux pipe 7 may be detachably fitted. With such a configuration, it is possible to easily adjust the heat exchange capability of the heat pipes 1A to 1C.

  Further, heat insulating materials may be disposed on the outer peripheral surfaces of the steam pipe 6 and the reflux pipe 7. With this configuration, it is possible to avoid heat exchange between the steam flow F flowing in the steam pipe 6 and the condensate L2 flowing in the reflux pipe 7 with the outside via the steam pipe 6 and the reflux pipe 7. . Therefore, an effect that heat can be carried further can be obtained.

1A, 1B, 1C Heat pipe 2, 4 External 3 Heat receiving part 5 Heat radiating part 6 Steam pipe 6a One end part 6b of the steam pipe 6h The other end part 6h of the steam pipe Inner hole 7 Recirculation pipe 7a One end part of the reflux pipe 7b The other end 7h of the reflux pipe Inner hole 8, 9 Header 10a One plane 20 Unit L1 Hydraulic fluid F Steam flow L2 Condensate X One direction

Claims (4)

A heat receiving part that receives heat from the outside, a heat radiating part that radiates heat to the outside, and a heat exchanger that is disposed so as to straddle between the heat receiving part and the heat radiating part. A steam pipe that flows toward the heat receiving section, and a reflux pipe that flows a condensate obtained by condensing the steam flow in the heat radiating section toward the heat receiving section,
The steam pipe and the reflux pipe are arranged spaced apart from each other,
One end of the steam pipe and one end of the reflux pipe, and the other end of the steam pipe and the other end of the reflux pipe are connected by a header, respectively. Heat pipe to be used.   The heat pipe according to claim 1, wherein a plurality of the steam pipes and the reflux pipes are provided and arranged alternately.   At least one end of the one end or the other end of the steam pipe or the one end or the other end of the reflux pipe has an inner hole facing the header. The heat pipe according to claim 1, wherein the heat pipe is formed in a tapered shape that gradually expands. A plurality of units formed by arranging the steam pipe and the reflux pipe on one plane;
The heat pipe according to any one of claims 1 to 3, wherein each unit is laminated with the one plane facing in one direction.

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