JPS6039652Y2 - Fins for heat pipes - Google Patents

Description

[Detailed Description of the Invention] The present invention is intended to provide a radiation fin that is inexpensive and has good cooling efficiency as a self-cooling fin for a straight heat pipe.

Generally, the most efficient way to use a heat pipe is to make a straight heat pipe vertical and use the upper part as a condensing part and the lower part as an evaporating part.

However, when the upper condensing part of the heat pipe is shaped with radiation fins and used for self-cooling, the heat radiation ability of the heat pipe can vary greatly depending on the method of attaching the fins.

Conventionally, when using a straight heat pipe vertically,
As shown in Figure 1, to attach to the heat pipe 1, a part 2 and a fin part 3 are made by die-casting aluminum, and as shown in the figure, screws 4 are attached so that the two pieces are tightly attached as a pair. It was fixed.

However, in the above configuration, since the fin 3 and the mounting portion 2 are formed by aluminum die-casting, the thickness of the fin 3 becomes thick, and it is difficult to manufacture a large fin shape.

In addition, increasing the plate thickness increases the material cost of the fins 3 and also increases the weight, making it difficult to handle as a heat pipe.

Furthermore, in order to change specifications such as fin size,
This had the disadvantage of requiring a new mold to be manufactured, making it difficult to adapt to design changes, and increasing costs.

On the other hand, in the case of the fin structure using the fin press-fit method, the thickness of the aluminum fin can be used up to about 0.4 m, which reduces the amount of material used, but the fin tends to loosen, and when used as a horizontal fin, the heat transfer of the fin The coefficient was small, and the amount of heat dissipated from the fins was small.

Furthermore, in order to improve heat dissipation, it is necessary to bend the heat pipe into an L shape and make the fins vertical, which increases the volume occupied by the fins.

Furthermore, when installing the heat pipe to the equipment, it was difficult to install the heat pipe because it had fins.

The present invention has been devised in view of the above-mentioned drawbacks of the conventional art, and embodiments of the present invention will be described below with reference to FIGS. 2 to 5.

In Fig. 2, reference numeral 5 denotes a pair of fin mounting bases made of aluminum or the like with a recess 5a so as to be in close contact with the outer circumferential surface of the heat pipe 1, and are tightly fixed to the heat pipe 1 with screws 4 together with the fins described later. There is.

At this time, heat conduction between the heat pipe 1 and the fin mounting base 5 can be further improved by applying a filler such as silicone grease or epoxy resin with good thermal conductivity to the recess 5a.

Reference numeral 6 denotes a fin formed by bending at least two or more metal plates such as aluminum plates or copper plates, and one side 6a of the bent portion is placed approximately parallel to each other with an interval, and one side 6b of the bent portion is placed approximately parallel to the other side 6b. It is integrally attached with the heat pipe 1 to the fin mounting base 5 with screws 4 so that the parts are in close contact with each other.

In addition, the fins 6 may be fixed by spot welding or the like, or
The fin installation work becomes extremely easy if it is fixed to the fin installation base.

Further, when the one side 6a of the bent portion of the fin 6 is made into a wave shape, the surface area becomes larger and the heat transfer coefficient becomes larger.

Figure 3 shows the schematic structure of the fin part when using the fin mounting base 7 manufactured by processing or casting an aluminum plate.The feature of this structure is that one end of the fin group is in contact with the other end. By using the spaced apart fins 6c, the fins can be placed in locations where parallel fins cannot be installed.

Figures 4 and 5 show the results of the study on the fin structure. From Figure 4, the fin pitch is 4 to 10 mm.
It can be seen that this is an area of high material efficiency.

Furthermore, regarding the thickness of the fin, as shown in FIG. 6, the thicker the fin, the greater the amount of heat dissipated, but in consideration of cost, the most efficient range is 0.25 to 1.0 mm.

Note that the above range is an optimum range, and the features of the basic structure of the present invention are fully exhibited even in ranges outside of this range.

As is clear from the above description, the present invention provides the following effects.

(1) Even if there are many specifications for the type of fin material, plate thickness, pitch, and shape, it can be easily accommodated.

(2>0.25~), it is inexpensive because a thin plate such as an aluminum plate with a thickness of 0 mm can be used.

(3) The fins can be attached after the heat pipe body is attached to the device.

(4) When using a straight heat pipe vertically, convection occurs between the fins from the bottom to the top, resulting in the highest cooling efficiency among natural cooling methods.

Furthermore, the space occupied by the heat pipe can be minimized in terms of plane.

(5) By using the fin base, the heat pipe and fins are closely attached and firmly fixed.

[Brief explanation of drawings]

Fig. 1 is a plan view of a heat pipe equipped with conventional aluminum die-cast fins, Fig. 2 is a perspective view of a heat pipe according to an embodiment of the present invention, and Fig. 3 is a plan view of a heat pipe according to another embodiment of the present invention. A plan view of the heat pipe, FIG. 4 is a diagram showing the relationship between the fin pitch and the amount of heat radiation, and FIG. 5 is a diagram showing the relationship between the plate thickness of the fin and the amount of heat radiation. 1... Heat pipe, 5, 7... Fin mounting base, 6... Fin.

Claims (3)

[Scope of utility model registration request] (1) A pair of fin mounting bases each having a recessed portion so as to be in close contact with the outer peripheral surface of the heat pipe body are tightly fixed to the heat pipe, and at least two or more metal plates are bent.
A heat pipe fin comprising fins in which one side of the bent portions are spaced apart from each other and are substantially parallel to each other, and the other sides are in close contact with each other, and the fins are closely fixed to the fin mounting base. (2) The fin for a heat pipe according to claim 1, wherein the spacing between the fins forming the parallel surfaces is set in a range of 4 to 10 stiffnesses. (3) The thickness of the fin is 0.25 to 1.077C.
A fin for a heat pipe according to claim 1 of the utility model registration claim, which is set within the range of I71.