JPH0424490A - Capillary pump - Google Patents

Abstract

PURPOSE:To reduce a pressure loss when fluid passes through a part having capillary effect and increase the maximum heat transporting amount by a method wherein a porous evaporating body, having the capillary effect, is thinned while a vapor flow passage, enclosed by the porous evaporating body and a thermal bridge, transferring heat from the porous evaporating body and a heat absorbing surface to the porous evaporating body, is enlarged comparatively. CONSTITUTION:A capillary pump 1 is constituted of a thin porous evaporating body 9, a thermal bridge 11 transferring heat Q from a heat absorbing surface 10 to the porous evaporating body 9, a comparatively large vapor flow passage 12, enclosed by the porous evaporating body 9 and the thermal bridge 11, and a vapor outlet port 13, communicating a liquid reservoir 8 and a liquid inlet port 7, which are positioned at the opposite side of the vapor flow passage 12 of the porous evaporating body 9, with the vapor flow passage 12. Liquid, entered the liquid reservoir 8 through the liquid inlet port 7, soaks into the porous evaporating body 9 by capillary effect and is evaporated in the porous evaporating body 9 by heat, entered from the heat absorbing surface 10 through the thermal bridge 11. The evaporated vapor flows out of a vapor outlet port 13 through the vapor flow passage 12. Accordingly, the capillary effect is increased and a pressure loss, generated when the fluid is passed, is reduced remarkably.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a capillary pump used in a heat control device, etc., in which a liquid takes heat from a heating element and evaporates the liquid in another location to release the heat. It is something.

[Conventional technology]

Conventional capillary pumps of this type, for example,
It has a configuration as shown in FIG. 5 and FIG.

4 and 5, 21 is a liquid injection pipe, 22 is a supply hole, 23 is a reserve pipe, 24 is a small hole, 25 is a hole 49
26 is a group tube, 27 is a group, 28 is a board,
29 is a steam pipe.

That is, the working liquid passes through the liquid injection pipe 21 and flows into the reserve pipe 238 from the four supply holes 22. Reserve pipe 23
has 360 pores 24 through which the working liquid permeates into the wick 25. When the working liquid reaches the vicinity of the outer periphery of the wick 25 due to capillary action, the group tube 2
The working liquid absorbs the heat applied from the outer surface of 6, undergoes a phase change from liquid to gas, that is, evaporates, and flows out through group 27 to steam pipe 29, as shown by the arrow in FIG. do.

[Problem to be solved by the invention]

However, in the conventional capillary pump shown in FIG. 4 and FIG. A part of the inner circumferential surface of the wick 25 is in contact with the circumferential surface of the wick 25 to transmit heat, and a group 27 is required to allow evaporated steam to pass through. Since it is made narrower at the expense of the group 27 of the tube 45, the social resistance when the fluid in the tube 25 passes, that is, the pressure loss, increases, and the maximum heat transport amount of this column becomes small. There was a problem after all.

The present invention aims to solve the above problems. That is, one object of the present invention is to provide a capillary pump that can reduce the pressure loss when the material passes through a portion that acts as a capillary tube, and can increase the maximum amount of heat transport.

[Means for Solving the Problems] In order to achieve the above object, the capillary pump of the present invention includes a thin porous evaporator, a thermal bridge that transfers heat from an endothermic surface to the porous evaporator, and a thin porous evaporator. The porous evaporator is provided with a relatively large vapor flow path surrounded by the porous evaporator and the thermal bridge, and a liquid flow path provided on the opposite side of the porous evaporator from the vapor flow.

[Effect]

According to the present invention, the porous evaporator that acts as a capillary tube is made of a thin material, and the vapor flow path is further surrounded by the porous evaporator and a thermal bridge that transfers heat from the endothermic surface to the porous evaporator. is relatively large, the capillary action is large, and the pressure drop when the fluid passes is significantly small, resulting in a capillary pump with a large maximum heat transfer amount.

〔Example〕

FIG. 1 shows a first embodiment of the invention, FIG. 2 shows a capillary bomb loop, and FIG. 3 shows a second embodiment of the invention.

In FIG. 2, reference numeral 1 denotes a capillary pump. Steam evaporated by the capillary pump 1 passes through a steam pipe 2, is condensed in a condenser 3, and returns to the capillary pump 1 via a liquid pipe 4. Furthermore, it has an accumulator 5 that adjusts the amount of fluid in the loop and a pressure regulator 6 that adjusts the fluid pressure.

In FIG. 1, 7 is a liquid inlet, 8 is a liquid reservoir, 9 is a flat plate-like thin porous evaporator, 1o is a heat absorption surface 11 is a thermal bridge, 12 is a vapor flow path, and 13 is a vapor outlet.

That is, the capillary pump 1 includes a thin porous evaporator 9, a thermal bridge 11 that transfers heat Q to the porous evaporator 9 through an endothermic surface 1O, and a relatively large vapor pump surrounded by the porous evaporator 9 and the thermal bridge 11. A flow path 12;
It consists of a liquid reservoir 8 and a lower liquid inlet located on the opposite side of the vapor flow path 12 of the porous evaporator 9, and a vapor outlet 13 communicating with the vapor flow path 12.

In the capillary pump 1 constructed as shown in FIG. 1, the liquid flowing into the liquid reservoir 8 from the liquid entry lower permeates into the porous evaporator 9 by capillary action. This permeated liquid is evaporated in the porous evaporator 9 by the heat that passes through the thermal bridge 11 which also includes the endothermic surface 10 . This evaporated steam passes through the steam flow path 12 and flows out from the steam outlet 13.

In this way, since the porous body 9 that acts as a capillary tube is made of a thin material, and the steam flow path 12 is made of a relatively large piece, the capillary action becomes large and the pressure loss when the fluid passes through it becomes significant. becomes smaller, therefore
The maximum heat transport amount is large.

FIG. 3 shows a second embodiment of the invention.

This porous evaporator 9 is a thin-walled pipe-like object,
The interior of this porous evaporator 9 serves as a liquid flow path 14 .

Therefore, the liquid permeates into the porous evaporator 9 through the liquid channel 14 by capillary action. This liquid is evaporated on the outer surface of the porous evaporator 9 by the heat that enters from the endothermic surface 10 and passes through the thermal bridge 11 . This steam flows out through a steam flow path 12 through a steam outlet (not shown).

In this second embodiment as well, since the porous evaporator 9 is thin and the vapor flow path 12 is relatively large, the same functions and effects as in the first embodiment can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, since the thin porous evaporator has capillary action and the vapor flow path is relatively large, the pressure loss when the fluid passes through the capillary pump is small. Further, the pores of the porous evaporator are fine pores and have a large capillary action. For these reasons, the capillary pump has a large maximum heat transport amount.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the first embodiment of the present invention, Fig. 2 is an explanatory diagram of a capillary bomb loop, Fig. 3 is a sectional view showing the second embodiment of the invention, and Fig. 4 is a conventional FIG. 5 is a longitudinal cross-sectional view showing an example of this technique, and FIG. 5 is a cross-sectional view taken along the cutting line A-A in FIG. 4. 1... Capillary pump, 7... Liquid inlet, 8...
・Liquid reservoir, 9... Porous evaporator, 10... Endothermic surface,
11... Thermal bridge, 12... Steam flow path, 1
3... Steam outlet, 14... Liquid flow path.

Claims (1)

[Claims] 1. A thin porous evaporator, a thermal bridge that transfers heat from an endothermic surface to the porous evaporator, and a relatively large vapor flow surrounded by the porous evaporator and the thermal bridge. and a liquid flow path provided on the opposite side of the vapor flow path of the porous evaporator. 2. The capillary pump according to claim 1, wherein the porous evaporator has a flat plate shape. 3. The capillary pump according to claim 1, wherein the porous evaporator is pipe-shaped.