JPS5923470B2 - natural convection type radiator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radiator used in electronic equipment, and more particularly to a natural convection type radiator in which a refrigerant filled inside circulates and radiates heat.

Various types of radiators are used in electronic equipment to dissipate heat from parts that generate heat due to operating current.In order to dissipate a particularly large amount of heat, natural convection type radiators that apply the so-called heat pipe principle are used. A heat sink is used.

Figures 1a and 1b show conventional examples of such natural convection type heat sinks.

The heat radiating action of the natural convection type radiator will be explained with reference to these two figures. A closed pipe line 1 made of a metal pipe or the like is filled with a refrigerant 2. Further, a heat block 3 to which a power transistor 5 and the like are coupled is provided at the lower end of the closed pipe line 1, and a heat sink 4 having a plurality of fins is provided at its upper end. In such a structure, heat generated in the power transistor 5 and the like is transmitted to the outer wall surface of the closed conduit 1 via the heat block 3. The heat transferred to this section then passes through the pipe wall and heats the refrigerant inside. At this time, the refrigerant evaporates from the liquid surface of the refrigerant and moves to the upper part of the closed pipe line 1 as vapor, so when this vapor vaporizes, it takes away the heat of the refrigerant, and the heat retained in this vapor is transferred to the closed pipe line 1. carried to the top of 1. Furthermore, since a heat sink 4 is provided on the outside of the pipe at the upper part of the closed pipe line 1, the temperature of the inner wall portion of the closed pipe line 1 is also lower than that of other parts.
Steam rising from below condenses in this area. At this time, heat is applied to the inner wall of the closed pipe line 1, and the steam itself liquefies and circulates downward along the wall surface. Since the above process is carried out cyclically, the heat from the heat generating elements such as the power transistor 5 is smoothly transferred to the heat sink 4 one after another. Since the heat transfer through the process of vaporization and condensation of the refrigerant occurs at a very high speed, the characteristic of such natural convection type radiators is that the heat transfer capacity of the refrigerant part is extremely large. ing. However, in the case of conventional natural convection type radiators, the heat block 3 is provided in surface contact with the pipe constituting the closed conduit 1, so the thermal resistance becomes large at this contact surface, resulting in heat transfer. Therefore, there was a drawback that heat was accumulated in the heat block 3 and a sufficient heat dissipation effect could not be exhibited. SUMMARY OF THE INVENTION An object of the present invention is to provide a natural convection type heat radiator that reduces thermal resistance between a heat receiving member such as a heat block and a working fluid, and improves the heat radiation effect.

Hereinafter, the natural convection type heat radiator of the present invention will be explained in detail with reference to the drawings.

FIGS. 2a and 2b are cross-sectional views showing one embodiment of the present invention, and FIG. 2b is a cross-sectional view taken along the straight line A-A in FIG. 2a. In this figure, a refrigerant 2 is held in a closed conduit 1 made of a metal pipe or the like, and has a heat transporting function similar to that of the conventional method. That is, the heat generated in the heat generating component 5 such as a power transistor is transferred to the refrigerant via the heat receiving member 3 made of metal or the like, and in the upper part of the closed pipe line 1, the vapor of the refrigerant is transferred to the heat radiating member 4 also made of metal or the like. heat is being transferred. A major feature here is that the heat receiving member 3 penetrates the wall surface of the closed pipe line 1 and projects directly into the interior so as to come into contact with the refrigerant 2. Therefore, heat is directly transferred between the heat receiving member 3 and the refrigerant 2 without going through the wall of the closed pipe line 1, and heat is directly transferred without going through the wall of the closed pipe line 1. Preferably, the heat dissipation member 4 also penetrates the wall surface of the closed pipe line 1 and protrudes directly into the interior, so that heat is directly transferred from the refrigerant vapor to the heat dissipation member 4 without passing through the wall of the closed pipe line 1. It is designed so that With such a structure, it is possible to obtain a natural convection type heat radiator that has a superior heat dissipation effect compared to conventional ones. The natural convection heatsink according to the present invention can be used in electronic equipment, etc. in the same way as before, but it has a greater heat dissipation effect than conventional natural convection heatsinks, so it can be miniaturized and used in electronic devices. It is also possible to reduce the space occupied by the radiator inside, and when the dimensions are the same, the heat radiating effect is high, contributing to stabilizing the performance of the device.

Further, in the above embodiment, the closed pipe line holding the refrigerant has a cylindrical shape, and the heat receiving member and the heat radiating member have a flat plate shape, but the present invention is not limited to this.
It can be implemented in a natural convection type heat radiator having a heat radiating member.

Further, the shape of the portions of the heat receiving member and the heat radiating member extending into the closed pipe path may be arbitrary, and it is easily understood that the larger the surface area of these portions, the lower the thermal resistance.

[Brief explanation of the drawing]

Figure 1a is a diagram showing a vertical cross section of a conventional natural convection type radiator;
Fig. 1b is a plan view of the heat block of the natural convection type radiator shown in Fig. 1a, Fig. 2a is a longitudinal cross-sectional view of an embodiment of the natural convection type radiator according to the present invention, and Fig. 2b is a plan view of the heat block of the natural convection type radiator illustrated in Fig. 1a. It is a figure which shows the cross section along the straight line A-A in figure 2a. Explanation of symbols of main parts, 1...Closed pipe line, 2...
... Refrigerant, 3 ... Heat receiving member, 4 ...
- Heat dissipation member, 5... Heat generating component.

Claims (1)

[Claims] 1. A natural convection type radiator characterized in that a heat-receiving member having a heat-generating component attached at a position outside the closed conduit passes through the pipe wall of the closed conduit and protrudes so as to come into contact with the refrigerant contained therein. .