JPH02223793A - Heat pipe - Google Patents

Abstract

PURPOSE:To make it hard to generate dry-out by a method wherein a heat pipe is constituted of the double structure of a tubular inner tube and an outer tube and an annular operating liquid passage is formed between the inner tube, bored with a multitude of fine holes, and the outer tube while a vapor passage is formed in the inner tube respectively. CONSTITUTION:The amount of heat from a heat generating equipment is conducted through an outer tube 14 and is transferred to operating liquid, existing in an annular operating liquid flow passage 15 between an inner tube 12 and the outer tube 14, while the heat is changed into the latent heat of vapor, evaporated through the groups of fine holes 12a of the inner tube 12, and the vapor flows to a low-temperature section through a vapor flow passage 16, then, the heat is changed into condensing heat and is discharged to the outside of a pipe. According to this constitution, the circumferential movement as well as the axial movement of the flow of the operating liquid may be permitted by a pressure difference in a capillary tube, which is generated from the annular operating liquid flow passage 15 between the inner tube 12 and the outer tube 14, even when the evaporating section 15b of the heat pipe and the condensing section 15a of the same are positioned at opposite side whereby the liquid in the condensing section 15a may readily be returned to the evaporating section 15b and dry-out may hardly be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a Hild pipe used for heat transport or heat transfer.

[Conventional technology] In explaining this type of conventional heat vibrator.

FIG. 5 is a diagram showing an embodiment in which heat-generating devices such as electronic devices arranged on the panel 1 are thermally controlled.

2 is a heat generating device, 3 is an embedded heat vibrator for heat transport,
1a is the panel surface on the side that is in contact with the heat generating device 2.

1b is the back side of the panel on the side that dissipates heat into space, Figure 6 (a
)(b) is used in the embodiment described in FIG.
Fig. 7 is an enlarged cross-sectional view of the heat vibrator 3 taken along the line 6 (b) - - 7, 7 is a sealing part, 8 is an end cap, 9 transfers the working fluid from the heat pipe condensing section 3C to the heat vibe evaporating section 3b.
This is a radial groove that is provided in the axial direction of the inner surface of the conduit 3a of the heat vibrator 3 in order to return the heat to the heat vibrator 3.

In FIGS. 5 to 7, the amount of heat generated from one heat generating device 2 is transported by a heat vibrator 3, and is emitted from the back surface 1b of the heat dissipation panel to the surrounding space. At this time, the heat pipe evaporating section 3b in the tube 13a where the working fluid (not shown) in the heat pipe 3 conduit 3a generates heat is a portion extending over the entire length of the heat pipe 3 on the panel surface 1a side where the heat generator 2 is attached. The heat pipe condensing section 3C in which steam is condensed is a portion extending over the entire length of the heat pipe 3 on the back side 1b of the heat dissipation panel. Further, the condensed working fluid returns to the heat vibrator evaporating section 3b through the axial radial grooves 9 groups due to the capillary pressure difference, which repeats the cycle.

[Problems to be Solved by the Invention] In the embodiment described above, the heat vibe evaporating section 3b and the heat pipe condensing section 3C are located on the opposite surface 1a of the panel 3 conduit 3a,
There is a pool of working fluid in the heat pipe condensing section 3C of the conduit 3a, but since the radiant temperature group 9 is cut only in the three axial directions of the heat pipe, the working fluid does not reach the heat pipe evaporating section 3b. The liquid cannot return, and heat transport by steam stops.

There is a drawback that a so-called dry-out condition of the heat pipe 3 is likely to occur.

In view of the problems with the conventional heat pipes, the present invention provides heat generation equipment by installing a heat generating device on the panel.
In heat pipes used when performing

Provides a heat pipe that is less prone to dry out by preventing liquid accumulation in the heat pipe condensing section 3C, distributing the two working fluids uniformly in the circumferential direction, and making it easier to return to the heat vibe evaporation section 3b. This is what I am trying to do.

[Means for Solving the Problems] The present invention provides a heat pipe that transports heat from a high-temperature part to a low-temperature part, which has a dual structure of two cylindrical inner tubes and an outer tube, and has a large number of pores passing through it. An annular working fluid flow path is formed between the inner tube and the outer pipe, and a vapor flow path is formed within the inner tube to facilitate returning the condensed working fluid from the heat pipe condensing section to the heat vibe evaporation section. This heat pipe has a large number of pores in the inner pipe wall to facilitate the evaporation of the working fluid.

[Example] An example of the present invention will be described with reference to FIGS. 1 to 4.

Fig. 1 is an external view of an example of the structure of the heat pipe according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ of Fig. 1, and Fig. 3 is a vertical cross-section taken along the line x-■ of Fig. 1. 4 are perspective views with the outer tube partially peeled off.

In the figure, 10 is a sealing part that seals the working fluid, 11 is an end cap, and 12 is a heat pipe 13 with a group of pores 12a arranged unevenly.
14 is an outer tube, 15 is an annular working fluid flow path formed between the inner tube 12 and the outer tube 14, and a path for liquid to return from the heat pipe condensing section 15a to the heat vibe evaporating section 15b; Reference numeral 16 denotes a steam flow path through which steam from the heat vibrator evaporator 15b flows to the heat pipe condenser 15a.

[Function] Therefore, the amount of heat from the heat generating device 2 is transmitted through the outer tube 14 to the hydraulic fluid present in the annular hydraulic fluid flow path 15 between the inner tube 12 and the outer tube 14, and is transferred from the pores 12a group of the inner tube 12. The latent heat of the evaporating steam flows through the steam flow path 16 to the low temperature section, and when the phase changes to liquid, it becomes condensation heat and is released. At this time, even if the heat vibe evaporating section 15b and the heat pipe condensing section t5a are on opposite sides as in the conventional case, the flow of the working fluid is caused by the capillary pressure generated from the annular working fluid flow path 15 between the inner tube 12 and the outer tube 14. Since the difference enables movement in the circumferential direction and movement in the axial direction, the liquid in the heat pipe condensing section 15a can be returned to the heat vibe evaporating section 15b.

In the present invention, one working fluid is transferred to the heat pipe condensing section 15a.
By making the annular working fluid flow path 15 that is returned to the heat vibe evaporation section 15b in the space between the outer tube 14 and the inner tube 12, the condensed liquid is prevented from partially accumulating and is The hydraulic fluid can be distributed evenly.

[Effects of the Invention] Thus, in the present invention, the double pipe structure allows the liquid to flow in the circumferential direction and the axial direction, so that the heat vibe evaporating part and the heat pipe condensing part are located in the same pipe and have opposing internal parts. Even if it exists on the side, the working fluid from the heat pipe condensing section will easily return to the P1-pipe evaporation section,
It has excellent effects such as making dry-out less likely to occur.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention with some dimensions omitted; Figs. 2 and 3 are sectional views taken along the lines ■-■ and ■-■ in Fig. 1; and Fig. 4 shows the outer tube. A perspective view of the present invention with a part peeled off, FIG. 5 is an explanatory diagram of a conventional heat pipe in use, and FIG. 6(a)
(b) is a partially omitted side view of various conventional heat pipes. FIG. 7 is an enlarged cross-sectional view taken along the line ■-■ in FIG. 6(b). 3.13...Heat vibe 3b, 15b...Heat vibe evaporation part 3c, 15a
... Heat pipe condensing section 12a ... Pore 15 ... Annular working fluid flow path 12 ... Inner pipe 14 ... Outer pipe 16 ... Steam flow path Fig. 4 Fig. 3 Fig. 1 Figure 2 Figure 5

Claims (1)

[Claims] 1. A heat pipe that transports heat from a high-temperature part to a low-temperature part has a double-tube structure consisting of a cylindrical inner tube and an outer tube,
A heat pipe formed by forming an annular working fluid flow path between the inner tube and the outer tube having a large number of pores penetrating therethrough, and a steam flow path within the inner tube.