JPH087256Y2 - Separated heat pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a heat pipe for transporting heat as latent heat of vaporization of a working fluid.

2. Description of the Related Art A general structure of a heat pipe is shown in FIG. In FIG. 2, the closed tube 10 is made of a metal tube having a good thermal conductivity such as copper, and the inside thereof is vacuum degassed,
Condensable fluids such as water, freon, and alcohol are working fluids
A mesh 12 is provided as a wick for generating a capillary pressure on the inner wall of the closed tube 10.

In this heat pipe, if the lower part of the drawing is given heat as a heating part 13 and the upper part of the drawing is taken as cooling part 14, the working fluid 11 is evaporated in the heating part 13. , The steam 15 flows to the side of the cooling unit 14 having a low pressure, and the working fluid steam 15 that radiates heat on the pipe wall of the cooling unit
Is condensed. In the heating unit 13, since a capillary pressure is generated in the fine opening of the mesh 12, the pump action causes the condensate 16 to flow back to the heating unit 13.

In this way, the working fluid 11 circulates and flows with evaporation and condensation, and as a result of its latent heat of evaporation, the heating unit 13
Heat is transferred from the cooling section 14 to the cooling section 14.

Further, FIG. 3 shows a loop type heat pipe, and this heat pipe connects the upper end portions and the lower end portions of the vapor flow pipe 16 and the liquid return pipe 17 to each other to form a loop-shaped pipe line, The working fluid 18 is sealed inside in a vacuum deaerated state.

In this loop type heat pipe, as shown in FIG. 3, they are arranged vertically, and the lower part of the vapor flow pipe 16 serves as a heating part 19 and the upper part of the liquid return pipe 17 serves as a cooling part 20. As a result, the working fluid 18 evaporates in the lower portion of the vapor flow pipe 16 and the vapor 21 flows through the vapor flow pipe 16 to the cooling unit 20, where the working fluid vapor 21 radiates heat and condenses. And condensate
22 flows inside the liquid return pipe 17 to the lower end side thereof.

Problems to be Solved by the Invention In the heat pipe, since the working fluid transports heat as a vapor flow as described above, if the heat flux to the heating section increases, the flow velocity and flow rate of the vapor flow increase and the flow velocity increases. May reach the speed of sound at maximum.

However, in the heat pipe having the general structure shown in FIG. 2, since the vapor flow and the condensate flow returning to the heating portion are in contact with each other, the condensate is peeled off as the vapor flow speed increases. . When such so-called flooding occurs, the amount of the condensate refluxed to the heating unit decreases, and the heat transport capacity decreases. In the worst case, dryout occurs in the heating unit and heat transport cannot be performed. That is, this is the limit of the heat transport capacity called the scattering limit, and the general heat pipe shown in FIG. 2 is restricted by the scattering limit.

On the other hand, in the loop type heat pipe shown in FIG. 3, since the vapor flow and the condensate flow are completely separated, there is no scattering limit. However, since it is necessary to connect a plurality of pipes to form a loop, the size is increased as a whole, and as a result, there is a problem that the space efficiency is reduced and the installation place or the purpose of use is restricted.

This invention was made in the background of the above circumstances,
The object of the present invention is to provide a heat pipe which eliminates the restriction of heat transport capacity due to the scattering limit and has a small installation space.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention condenses in a vacuum degassed state inside a sealed tube whose one end is a heating part and the other end is a cooling part. In a heat pipe in which a volatile working fluid is enclosed, a partition plate is provided inside the sealed tube at an intermediate portion between the heating part and the cooling part, and one end of the partition plate is on the cooling part side. With a liquid flow tube that is open at the other end and extends at the other end near the end of the heating part, and steam that is open at one end toward the heating part and at the other end near the end of the cooling part. And a flow tube is attached.

Action In the heat pipe of the present invention, the working fluid evaporates in the heating section, the steam flows into the cooling section, and then the heat is radiated and condensed in the cooling section. In the heat pipe of this invention, the steam of the working fluid generated in the heating section flows through the steam flow tube to the vicinity of the end of the cooling section, and then contacts the wall of the cooling section to radiate heat. , To condense. The condensed working fluid passes through the partition plate and returns to the vicinity of the end of the heating unit through the liquid flow pipe that is open to the cooling unit side. That is, the steam flow is separated from the hydraulic fluid by the steam flow tube,
The working fluid flow is also separated from the vapor flow by a liquid flow tube.
As a result, in the heat pipe of this invention, the working fluid flowing back to the heating section does not scatter.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

The long and closed pipe 1 is arranged in the vertical direction, and a horizontal partition plate 2 for partitioning the inside of the pipe 1 into the upper and lower parts is provided at an intermediate portion thereof. The partition plate 2 is attached with a steam flow pipe 3 which communicates with the small hole 2a and extends upward, and the end of the steam flow pipe 3 reaches the vicinity of the upper end of the pipe 1. Further, a liquid flow pipe 4 communicating with another small hole 2b and extending downward is attached to the partition plate 2, and the lower end of the liquid flow pipe 4 reaches the vicinity of the lower end of the pipe 1.

The lower end of the pipe 1 is a heating unit 5 that receives heat from the outside, and the upper end of the pipe 1 is a cooling unit 6 that removes heat to the outside. Further, inside the pipe 1, an appropriate working fluid 7 such as CFC or water in a vacuum deaerated state.
Is stored in an appropriate amount.

 Next, the operation of the above heat pipe will be described.

In the liquid state, the working fluid 7 stays in the heating section 5 at the lower part of the pipe 1 to form a liquid pool 7a, which is evaporated by the heat transmitted from the outside and becomes vapor 7b. This steam 7b
It moves upward and reaches the partition plate 2 first. Partition board 2
Only the small hole 2a is open on the lower surface side of the steam generator 7. Therefore, the steam 7b is discharged from the small hole 2a through the steam flow pipe 3 into the space at the upper end of the pipe 1. In the cooling section 6 at the upper end of the pipe 1, the working fluid vapor 7b is deprived of heat to liquefy and becomes a condensate 7c.

The condensate 7c propagates along the inner wall of the pipe 1 and descends due to gravity and reaches the upper surface side of the partition plate 2. On the upper surface side of the partition plate 2, only the small holes 2b are open, and the condensate 7c
Moves downward from the small hole 2b through the liquid flow pipe 4, and is discharged into the liquid pool 7b formed in the lower part of the pipe 1.

As described above, the vapor 7b and the condensate 7c are reliably separated by the vapor flow pipe 3 and the liquid flow pipe 4, respectively, and the vapor flow does not impair the liquid flow. Therefore, even if the speed of the steam flow is sufficiently high, the condensate does not scatter due to flooding, and the heat transport capacity can be increased.

In the above embodiment, one vapor flow pipe and one liquid flow pipe are provided, but a plurality of vapor flow pipes and liquid flow pipes may be provided for each application.

Further, in the above embodiment, the partition plate is provided in the middle of the pipe, but its position can be changed appropriately. Further, the pipe does not necessarily have to be arranged in the vertical direction, and its posture can be determined depending on the purpose of use. Further, the reflux of the condensate may be performed by the capillary action of the wick instead of by gravity.

Effect of the Invention As described above, according to the separation type heat pipe of the present invention, the vapor flow and the condensate flow can be reliably separated, so that the heat transfer amount can be dramatically increased as compared with the conventional one. In addition, since the structure is simple and it is possible to form a single pipe in appearance, it is possible to obtain an effect that installation is not restricted.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view of a conventional general heat pipe, and FIG. 3 is a sectional view of a conventional loop heat pipe. 1 ... Pipe, 2 ... Partition plate, 3 ... Steam flow tube, 4 ...
... Liquid flow tube, 5 ... Heating part, 6 ... Cooling part, 7 ... Working fluid, 7b ... Steam, 7c ... Condensate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Masuko 5-1-5 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Creator Masahiko Ito 1-1-5 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Inventor Yuuji Saito 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A heat pipe in which a condensable working fluid is sealed in a vacuum deaerated state inside a sealed tube having one end serving as a heating section and the other end serving as a cooling section, Inside the heating section and the cooling section,
A partition plate is provided, and the partition plate has a liquid flow pipe having one end opening toward the cooling section and the other end extending near the end of the heating section, and one end section of the heating section. A separate heat pipe, characterized in that a steam flow tube which is open to the side and has the other end extending near the end of the cooling section is attached.