JPH0680916B2 - Cooling system - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a cooling device used for cooling an electronic device or the like.

[Technical Background of the Invention and Problems Thereof] In recent years, due to high-density mounting of electronic elements, the heat generation density of electronic devices has been increasing more and more. Further, due to the demand for downsizing of equipment, a large space for heat radiation cannot be taken. Therefore, it has become impossible to perform sufficient cooling in the conventional cooling device using the radiation fins.

Further, since a cooling device using a fan has a problem of noise, a large limitation is imposed on its capacity and the number of units.

Further, a cooling device using a heat pipe is also under study. However, in this heat pipe, the optimum amount of the working fluid is determined, and the working fluid in the device casing (hereinafter, referred to as the container) needs to be constantly maintained at a constant amount. It is desirable to be completely sealed.

However, since the shaft is provided so as to penetrate the container in the related art, the sealed state of the container is broken, and the working fluid in the container constantly leaks from the through hole of the shaft even though it is small. Therefore, the optimum amount of the working fluid of the heat pipe cannot be maintained gradually, the pressure difference of the evaporation flow inside the container becomes small, and the rotation efficiency of the turbine propeller provided inside the container decreases. As a result, there is an adverse effect that the cooling effect is reduced, and continuous use is difficult.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object thereof is to provide a cooling device capable of sufficiently cooling even an electronic element having a high heat generation density.

SUMMARY OF THE INVENTION The present invention relates to a container in which a working medium is enclosed and attached to a body to be cooled, and vapor generated by evaporation of the working medium in the container, which is rotatably provided below the top plate of the container. A turbine blade that is rotationally driven by a flow, an internal magnetic coupling means that rotates in conjunction with the rotation of the turbine blade and that is provided on the lower side of the top plate, and that face each other so as to be magnetically coupled to the internal magnetic coupling means. And the external magnetic coupling means rotatably provided on the upper side of the upper plate, the fan rotationally driven by the rotation of the external magnetic coupling means and provided on the upper side of the upper plate, and the working medium in the container is evaporated. And a return flow path provided apart from the container on the outside of the container for returning the working medium condensed and liquefied in the upper part of the container to the lower part of the container. It is characterized by having.

Embodiment of the Invention FIG. 1 is a sectional view showing a cooling device according to a first embodiment of the present invention. In this drawing, an electronic container 1 having a high heat generation density is thermally connected to a cylindrical or rectangular outer container 2 having a closed top end at a bottom end plate 2a thereof.
In the outer container 2, an inner container 3 having the same cylindrical shape or a rectangular tube shape and whose upper and lower ends are opened is installed with a gap 20 formed between the outer peripheral surface thereof and the inner peripheral surface of the outer container 2.

A refrigerant (working medium) 4 such as Freon is contained in the outer container 2. Also, the upper end plate of the outer container 2
A turbine shaft 5 is rotatably attached to 2b so that the axis line of the outer container 2 coincides with the axis line of the outer container 2. The turbine shaft 5 is rotatably attached to the lower end of the turbine shaft 5.
The turbine blades 6 are mounted inside. A disc-shaped internal magnet plate 7 is fixed to a gap 20 formed between the outer container 2 and the inner container 3 of the turbine shaft 5. A fan shaft 8 is rotatably disposed on the outer surface of the upper end plate 2a with its axis aligned with the axis of the outer container 2, and a fan 9 is attached to the upper end of the fan shaft 8. An external magnet plate 10 is attached near the lower end of the fan shaft 8 (on the upper end plate 26 of the outer container 2).
The inner magnet 7 and the outer magnet 10 are arranged so as to face each other with the upper end plate 2b of the outer container 2 interposed therebetween.

The cooling device of the present invention having the above-described configuration operates as follows. The heat of the electronic element 1 causes the refrigerant 4 to evaporate and become a vapor stream 21 to rise. During the evaporation, the electronic device 1 is cooled by the latent heat of vaporization.

Since the turbine blade 6 is rotated by the steam flow 21, the turbine shaft 5 and the internal magnet plate 7 are also rotated integrally with the rotation of the turbine blade 6. When the inner magnet plate 7 rotates, the magnetic force causes the outer magnet plate 10 to rotate in conjunction,
The fan 9 attached to the fan shaft 8 also rotates integrally.

Due to the rotation of the fan 9, an ascending flow of air is generated along the outer peripheral surface of the outer container 1, and the ascending flow of the air condenses and liquefies the vapor flow 21 that has risen to the upper portion in the outer container 2 and the inner container 2 and the inner container 2. It returns to the inside of the return flow path 22 formed on the side surface between the containers 3.

As described above, the electronic element 1 is cooled efficiently by the so-called gravity type heat pipe formed on the upper portion thereof, with its thermal resistance reduced.

FIG. 2 is a sectional view showing a cooling device according to the second embodiment of the present invention.

As shown in this figure, in this embodiment, an inner cylinder 11 which is concentric with the outer container 2 is disposed on the upper portion (between the turbine blades 6 and the inner magnets 7) of the outer container 2 via a bottom plate 11a.
A plurality of (two in the figure) flow path pipes 12 communicating with the lower part of the outer container 2 through a flow path 23 formed between the upper part of the inner cylinder 11 and the inner cylinder 11.
Is arranged outside the outer container 2.

In this way, in this embodiment, instead of the inner container 3 shown in the first embodiment, the steam flow 21 for rotating the turbine blades 6 through the passage tube 12 can be returned to the lower portion of the outer container 2. The other structure is the same as that of the first embodiment.

That is, in this embodiment, the heat generated by the electronic element 1 causes the refrigerant 4 as a working fluid to evaporate and become a vapor flow 21 to rise. During this evaporation, the electronic device 1 is cooled by the latent heat of vaporization. Further, the steam flow 21 at this time drives the turbine blades 6 to rotate. As a result, the internal magnet plate 7 that shares a rotation axis with the turbine blade 6 is rotationally driven.

On the other hand, the inside and outside of the container 2 in which the refrigerant 4 is enclosed have the axes of their respective rotating shafts aligned with each other, and the inner magnet plate 7 and the outer magnet plate 10 are provided so as to face each other.
The rotation of the inner magnet plate 7 causes the outer magnet plate 10 to rotate due to the action of so-called magnetic coupling. As a result, the rotational force of the turbine blades 6 inside the container 2 is indirectly transmitted to the fan 9 outside the container 2.

Further, the rotation of the fan 9 causes an ascending flow of air along the outer peripheral surface of the container 2, and the ascending flow of the air efficiently cools the flow path pipe 12. Further, the vapor flow 21 rising to the upper part in the container 2 sequentially flows into the flow path 23, and is further condensed and liquefied in the flow path pipe 12. The liquefied liquid refrigerant 4 drops in the flow path pipe 12 and returns to the bottom of the container 2. Thereafter, the above cycle is similarly repeated to efficiently cool the electronic device 1.

As described above, according to such a configuration, the sealed state of the container 2 can be maintained even when the fan 9 is rotationally driven, so that the state where the pressure difference of the vapor flow of the refrigerant 4 inside the container 2 is always large is maintained, Since the rotation efficiency of the turbine blades 6 is improved and the optimum liquid amount of the refrigerant 4 is maintained, the cooling effect of the heat pipe can be maximized.

Further, in this embodiment, the flow passage pipe 12 is provided so that the returning flow of the liquid refrigerant does not hinder the rotation of the turbine blades 6, and the diameter of the turbine blades 6 is set to the inner diameter of the outer container 2. Turbine blade 6 because it can be fully taken
Rotation efficiency is increased, and more effective cooling is performed.

Further, in the cooling device of the present invention, as the amount of heat generated from the electronic element 1 increases, the energy of the steam flow 21 for rotating the turbine blades 6 increases, the rotation speed of the fan 9 also increases, and the cooling effect increases. . That is, the cooling device of the present invention has an automatic cooling adjustment function.

[Effects of the Invention] As described specifically above with reference to the embodiments, according to the present invention, it is possible to reduce the thermal resistance and efficiently cool a cooled object such as an electronic device.

[Brief description of drawings]

FIG. 1 is a sectional view showing a cooling device according to a first embodiment of the present invention, and FIG. 2 is a sectional view showing a cooling device according to a second embodiment of the present invention. 1 ... Electronic element (cooled body) 2 ... Outer container 3 ... Inner container 4 ... Refrigerant (working medium) 5 ... Turbine shaft 6 ... Turbine blade 7 ... Internal magnet plate 8 ... Fan shaft 9 ...... Fan 10 …… External magnet plate 11 …… Inner cylinder 12 …… Flow path pipe (return flow path) 21 …… Steam flow

Claims (1)

[Claims] 1. A container mounted with a working medium in which a working medium is enclosed, and a container which is rotatably provided under a top plate of the container and is rotationally driven by a vapor flow generated by evaporation of the working medium in the container. A turbine blade, an internal magnetic coupling means which is interlocked with the rotation of the turbine blade and which is provided on the lower side of the upper plate, and which face each other so as to be magnetically coupled to the internal magnetic coupling means. An external magnetic coupling means rotatably provided above the face plate, a fan rotatably driven by the rotation of the external magnetic coupling means and provided above the top plate, and the working medium in the container evaporates and rises. A return flow path is provided outside the container so as to return the working medium condensed and liquefied in the upper part of the container to the lower part of the container Cooling apparatus according to claim and.