JPH0484089A - Exothermic substance cooling device - Google Patents

Abstract

PURPOSE:To provide an effective and proper exothermic substance cooling device by a method wherein a thermal absorption wick immersed with refrigerant liquid, having a better close- fitness and having a high capillary tube pressure including some heated substances is applied to an inner surface of a heating box near the exothermic substances and further a thermal radiation wick immersed with refrigerant liquid and having a high heat transfer rate is applied to other inner surfaces of the heating box than the former inner surface. CONSTITUTION:A thermal absorption wick 5 having a better close fitness with an exothermic substance 1 and capable of increasing a capillary tube pressure is installed near the exothermic substance 1 and then refrigerant liquid alpha can be easily returned back to a thermal absorption part 5a of the thermal absorption wick 5 as much as possible. Fixing of the thermal absorption wick 5 causes the refrigerant liquid alpha contained in the thermal absorption wick 5 to sufficiently wet the exothermic substance 1, resulting in that a large amount of refrigerant liquid alphacan be evaporated ant thus heat generated from the exothermic substance 1 can be removed as much as possible. In addition, an inner surface of the heating box 2 acting as a thermal radiation surface is provided with the thermal radiation wick 6 having a high heat transfer rate in a direction of the plane. With such an arrangement, it is possible to get a high thermal radiation rate and then a cooling of the exothermic substance 1 having a high heating amount can be carried out.

Description

[Detailed description of the invention] [Industrial application fields] TECHNICAL FIELD The present invention relates to a cooling device for high-heat generating substances.

[Background Art] In recent years, electronic devices have become smaller and the heat density of the devices has increased accordingly. Therefore, a means to efficiently release the generated heat is required. An effective way to solve this problem is to create a heat pipe inside the casing. Third
The figure is a cross-sectional diagram showing a heat control method for a so-called heat case in which the inside of the case is a heat pipe, and is disclosed in U.S. Patent No. 4.047.
, No. 498, which shows the main parts of the embodiment, in which:
1 is a heating element that generates heat, 2 is a heat casing for mounting the heating element 1 on the inside, 3 is a wick lined on the inside of the heat casing 2, 4 is a stand for mounting the casing. 0 Amount of heat generated is taken away as latent heat when the refrigerant liquid α impregnating the heat absorbing portion 3a of the wick 3 enclosing the exothermic material 1 evaporates. Further, the steam is thermally diffused and transported to the inner surface of the heat case 2, and heat is radiated from the heat case 2 and the case attachment to the outside from the base 4.

[Problems to be Solved by the Invention E] However, since the heat absorbing portion 3a of the wick 3 must be brought into enveloping contact with the exothermic material 1, the types of the wick 3 are extremely limited, and the wick 3 is generally made of bundled fibers. The heating element 1 was covered with fiber or sprayed with alumina powder. However, these wicks 3 have a high capillary pressure but a low heat transfer coefficient in the normal direction of the plane, and are very effective in returning the refrigerant liquid α to the heat absorption part 3a. No way-
Since the amount of steam condensed on the inner surface of the housing 2 is small, there is a drawback that sufficient heat radiation cannot be achieved.

As a result, when the amount of heat generated from the heating element 1 is large, the refrigerant liquid α in the heat absorption part 3a that is in contact with the heating element 1 disappears, so-called drying occurs, and the evaporation of the refrigerant liquid α stops. The temperature of the heating element 1 rises significantly.

In addition, if the same fiber wick 3 as that of the heat absorption part 3a is used on the inner surface of the heat casing 2 in contact with the heat radiation part 3b, the thermal conductivity in the normal direction to the plane will be reduced, so the amount of steam condensed will be reduced and the efficiency of heat radiation to the outside will be improved. is inferior.

SUMMARY OF THE INVENTION The present invention aims to provide a heating material cooling device that is effective and suitable for solving the above-mentioned conventional problems.

[Means for Solving the Problems] The above problems are achieved by the present invention employing the following characteristic configuration means.

That is, the first feature of the present invention is that when mounting the casing, the inner surface of the heat casing mounted on the table near where the heating element is mounted is impregnated with a refrigerant liquid to provide good adhesion and absorb heat with a large capillary pressure. A wick is lined to cover the heating element, and the other inner surface of the case is lined with a heat dissipating wick impregnated with a refrigerant liquid and having a high heat transfer coefficient in the direction normal to the plane. It is a heating substance cooling device.

A second feature of the present invention is a heating material cooling device according to the first feature, in which the wick having a high heat transfer coefficient in the direction normal to the plane is a groove wick in which a mesh cross groove is formed.

[Function] The present invention takes the above-mentioned measures and installs a type of heat-absorbing wick that has good adhesion to the heat-generating material and has a large capillary pressure near the inner surface of the housing to which the heat-generating material is attached. A type of heat dissipating wick with a good in-plane heat transfer coefficient is installed on the inner surface of the housing, and no heat generating substance is attached. This promotes the condensation action in the heat dissipating wick and induces rapid circulation through both wicks.

[Example code] Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of this embodiment, and FIG. 2 is a sectional view taken along the line 1--2 in FIG.

In the figure, 5 is a heat absorbing wick attached to the heat generating part 1 and the heat generating part 1 is attached to the inner surface of the nearby sleeve case 2, and 6 is the heat absorbing wick attached to the heat generating part 1 on the inner surface of the heat case α other than the nearby one. Heat dissipation wick, α is a refrigerant liquid impregnated in both wicks 5 and 6, filling the gap formed in both wicks 5 and 6, 7 is attached to the rim, 0 is in close contact with the heating element 1 An endothermic wick 5 which has good properties and can generate a large capillary pressure is installed near the heat generating element 1, so that the structure is such that the refrigerant liquid α returns to the endothermic part 5a of the endothermic wick 5 as easily as possible.

As an example of this heat-absorbing wick 5, if a heat-absorbing wick 5 made of bundled thin fibers is tightly attached to the upper part of the heat generating material 1,
By narrowing the gap between the fibers, the capillary pressure can be increased, and the refrigerant liquid α can easily return to the heat generating part. Further, in order to radiate the heat diffused and transported by the steam and improve the steam condensation effect on the inner surface of the casing 2, it is necessary to use a heat dissipating wick 6 having a large radial heat transfer coefficient. Therefore, for example, if a groove wick 6 with cross-hatched edges 6a is applied to the inner surface of the heat casing 2, which serves as a heat dissipation section, heat transfer in the normal direction to the plane is excellent, and the condensation rate increases and the amount of heat dissipation increases. Can be increased.

Since this embodiment exhibits the above-mentioned aspect, the heat generating element 1 and the heat generating element 1 are attached by attaching the heat absorbing wick 5 which has good adhesion near the point and has a large capillary pressure. Since the refrigerant liquid α sufficiently wets the exothermic substance l and a large amount of the refrigerant liquid α can be evaporated, more heat generated from the exothermic substance l can be removed. In addition, heat dissipation efficiency can be increased by installing a heat dissipation wick 6 with a high heat transfer coefficient in the surface direction on the inner surface of the heat case 2, which is the heat dissipation surface, so it is possible to cool the heat generating object 1 that generates a large amount of heat. becomes.

[Effects of the Invention] Thus, the present invention has the inner surface of the heat casing lined with multiple types of wicks depending on the function, making it easier for the refrigerant liquid to return to the heat absorbing part that comes into contact with the heat generating material. Since the amount of heat can be removed by steam, and the heat dissipation wick has a high heat transfer coefficient in the direction normal to the plane, a large amount of steam can be condensed, making it possible to cool a heat generating substance with a large calorific value. Although this embodiment shows the case where two types of wicks are attached, the same effect can be obtained even when a plurality of wicks are attached.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line 1--2 in FIG. 1, and FIG. 3 is a longitudinal sectional view of a conventional device. 1... Heat generating substance 2... Beat housing 3...
・Wick 5... Heat absorption wick 6... Heat dissipation wick α... Refrigerant liquid 4... Housing mounting is on stand 5a... Heat absorption part 6a... Wii Fig. 1

Claims (1)

[Claims] 1. On the inner surface of the heat casing mounted on the casing mounting base in the vicinity of where the heating element is mounted, an endothermic wick impregnated with a refrigerant liquid, which has good adhesion and a large capillary pressure, is also used to cover the heating element. A heating material cooling device 2 characterized in that the inner surface of the heat casing other than that is lined with a heat dissipation wick impregnated with a refrigerant liquid and having a high heat transfer coefficient in the direction normal to the plane. The heating material cooling device according to claim 1, wherein the heat dissipation wick having a high heat transfer coefficient in the direction is a groove wick having a cross-mesh groove.