JPH0345033Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Summary] This invention is a heat pipe heat dissipation structure in which a plurality of heat dissipation fins are attached to the heat dissipation side of the heat pipe. By shifting the mounting position of the heat dissipation fin to the heat dissipation side of the heat pipe by the section where the By providing an open substantially U-shaped cover fin and surrounding the heat dissipation end of the heat pipe with the cover fin, the heat dissipation end of the heat pipe is protected and the heat dissipation capacity is increased.

[Industrial application field]

The present invention relates to a heat dissipation structure of a heat pipe equipped with heat dissipation fins.

In electronic devices such as communication devices and information devices,
High-density packaging of electronic components is progressing, and IC
There is a tendency for high-density integrated circuit devices such as devices and LSI devices to be used more frequently. High density integrated circuit devices consume a lot of power and therefore generate a lot of heat. Therefore, it is necessary to efficiently dissipate heat generated from high-density integrated circuit elements to the outside of the device.

In recent years, heat pipes equipped with radiation fins have been used as a means for radiating heat generated from electronic components. A heat pipe transfers a large amount of heat by utilizing the evaporation and condensation of a working fluid sealed therein, and has the advantage of being lightweight and having a high heat transfer capacity.

By the way, it is known that non-condensable gas is generated inside heat pipes such as heat pipes in which water is sealed inside the vacuum of a stainless steel tube or ammonia is sealed in the vacuum inside of the stainless steel tube. Such gas increases as the number of years of use of the heat pipe increases, and tends to accumulate on the high temperature side of the heat pipe, that is, on the heat radiation side. If non-condensable gas accumulates inside the heat pipe, that part will no longer function as a heat pipe, so if you use heat dissipation fins attached to the heat dissipation side of the heat pipe, it is necessary to It is necessary to take measures to prevent the heat dissipation capacity from decreasing as the amount of gas generated increases.

[Prior art and its problems]

FIGS. 4a to 4c show the heat dissipation structure of a conventional heat pipe. The conventional example shown in FIG. 4a is
The mounting position of the heat dissipation fin 2 is shifted from the heat dissipation side end 1a of the heat pipe 1 to the heat absorption side by a section D in which non-condensable gas accumulates in the heat pipe during the service life of the heat pipe 1 (for example, 25 years) to dissipate heat. The heat dissipation effect from the fins 2 does not change during the service life. However, in the case of this conventional structure, since the tip of the heat pipe 1 protrudes from the heat dissipation fin 2, there is a risk of injury to a worker during assembly work, etc., and the appearance is also unfavorable.

In the heat dissipation structure shown in FIG. 4b, the heat dissipation fins 2 extend from the heat dissipation side end 1a of the heat pipe 1 by an area D in which non-condensable gas accumulates in the heat pipe during the service life of the heat pipe 1 (for example, 25 years). It is similar to the conventional example described above in that the mounting position of is shifted to the heat absorption side, but a decorative fin 3 is provided in the intermediate D. The existence of the decorative fins 3 eliminates the dangers in workability and defects in appearance, but when the amount of non-condensable gas generated is small, the decorative fins 3 also function effectively as heat dissipation fins, so during the service life. However, there is a drawback that the heat dissipation capacity of the entire heat dissipation structure varies greatly.

The heat dissipation structure shown in FIG. Although the length of the heat pipe protruding from the heat dissipation fins 2 is reduced, there is a problem in reliability during the service life of the heat pipe due to the presence of welded parts.

[Means for solving problems]

In view of the above-mentioned problems of the prior art, the present invention provides a heat dissipation structure in which a plurality of heat dissipation fins having a plane perpendicular to the longitudinal axis of the heat pipe are attached to the heat dissipation side of the heat pipe. The installation position of the heat dissipation fin is shifted to the heat absorption side of the heat pipe by the section where non-condensable gas is generated in the pipe, and a roughly U-shaped cover fin is installed that opens upward and downward to the heat dissipation fin closest to the heat dissipation side end of the heat pipe. Provided is a heat radiation structure for a heat pipe, characterized in that a heat radiation side end portion of the heat pipe is surrounded by the cover fin.

[Effect]

In the heat dissipation structure of the heat pipe according to the present invention, the installation position of the heat dissipation fin is shifted to the heat absorption side of the heat pipe by the amount of time that non-condensable gas is generated inside the heat pipe during the life of the heat pipe, so that the heat pipe can be used for a long time. All heat dissipation fins can be used effectively during the period, and fluctuations in heat dissipation capacity can be prevented. In addition, since the heat dissipation fin closest to the heat dissipation side end of the heat pipe is provided with a substantially U-shaped cover fin with the top and bottom open, and the cover fin surrounds the heat dissipation side end of the heat pipe, the heat dissipation side end of the heat pipe is can be protected and eliminate dangers and visual defects during work. Further, since the cover fin is provided on the heat dissipation fin that functions effectively during the service life, the cover fin also effectively functions as a heat dissipation fin, increasing the heat dissipation capacity of the entire heat dissipation structure.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. Referring to these figures, on the heat dissipation side of the heat pipe 11, there are a plurality of sheets (9 in this case) each having a plane perpendicular to the longitudinal axis of the heat pipe 11.
) of heat dissipation fins 12 are attached. As shown in FIG. 3, the heat absorbing side of the heat pipe 11 is connected via a heat transfer element 13 to an electronic component 15 that generates a large amount of heat, such as an IC element or an LSI element on a printed board 14.

The heat pipe 11 may be, for example, a stainless steel tube whose interior is depressurized and filled with water, ammonia, or the like as a working fluid. In this type of heat pipe 11, non-condensable gas is generated inside the heat pipe 11 during use, and this non-condensable gas gradually increases and accumulates on the high temperature side of the heat pipe 11, that is, on the heat radiation side. The heat pipe 11 no longer performs its function in the section where non-condensable gas accumulates. The rate of increase in non-condensable gas varies depending on the material and size of the tube and the type of hydraulic fluid.

Therefore, according to the present invention, non-condensable gas is generated and accumulated during the service life of the heat pipe 11 (for example, 25 years) in section D (for example, 50 to 60
The mounting position of the heat radiation fin 12 is shifted from the heat radiation side end 11a of the heat pipe 11 to the heat absorption side by an amount of mm).

Further, the heat dissipation fin 12 closest to the heat dissipation end 11a of the heat pipe 11 is provided with a substantially U-shaped cover fin 16 that is open at the top and bottom by integral molding or welding. As shown in FIG.
A gap is provided between the cover fin 16 and both ends of the heat pipe 11 for air circulation. Furthermore, cover fin 16
On both sides of the heat pipe 11, a distal end heat dissipating fin 17 parallel to the cover fin 16 is provided by integral molding or welding on the heat dissipating fin 12 closest to the heat dissipating end 11a of the heat pipe 11.

In the heat dissipation structure of the heat pipe having the above configuration, the mounting position of the heat dissipation fin 12 is moved to the endothermic side of the heat pipe 11 by an area D in which non-condensable gas is generated within the heat pipe 11 during the service life of the heat pipe 11. Since they are staggered, all the heat dissipation fins 12 can be used effectively during their service life, and fluctuations in heat dissipation capacity can be prevented. Further, since the heat dissipation side end portion 11a of the heat pipe 11 is surrounded by the cover fin 16, it is possible to eliminate dangers during work and defects in appearance. In addition, the cover fin 16 and the tip heat dissipation fin 1 are added to the heat dissipation fin 12 that functions effectively during the service life.
7, the cover fins 16 and the tip heat radiation fins 17 also function effectively as heat radiation fins, increasing the heat radiation capacity of the entire heat radiation structure.

Although the illustrated embodiments have been described above, the present invention is not limited to the durability of the above-described embodiments; for example, even if the tip heat dissipation fins are omitted, the intended purpose of the present invention can be achieved.

[Effect of idea]

As is clear from the above explanation, according to the present invention, the installation position of the heat dissipation fin is shifted to the endothermic side of the heat pipe by the amount of time during which non-condensable gas is generated within the heat pipe during the service life of the heat pipe. Therefore, it is possible to prevent fluctuations in the heat dissipation capacity during the service life, and in addition, a substantially U-shaped cover fin with an open top and bottom is provided on the heat dissipation fin closest to the end of the heat dissipation side of the heat pipe. Since the heat dissipation end of the heat pipe is surrounded, it is possible to protect the heat dissipation end of the heat pipe and increase the heat dissipation capacity of the entire heat dissipation structure.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main parts of the heat dissipation structure of a heat pipe showing an embodiment of the present invention, Fig. 2 is a perspective view of the main parts of the heat dissipation structure shown in Fig. 1, and Fig. 3 is the heat dissipation structure shown in Fig. 1. A side view showing an example in which the structure is applied to an electronic component, and FIGS. 4a to 4c are side views showing conventional examples of heat dissipation structures of heat pipes. In the figure, 11 is a heat pipe, 11a is a heat radiation side end, 12 is a heat radiation fin, 16 is a cover fin, and 17 is a tip heat radiation fin.

Claims (1)

[Claims for Utility Model Registration] 1. In a heat dissipation structure in which a plurality of heat dissipation fins 12 having a plane perpendicular to the longitudinal axis of the heat pipe are attached to the heat dissipation side of the heat pipe 11, the heat pipe does not dissipate during the life of the heat pipe. The installation position of the heat dissipation fin 12 is shifted to the heat absorption side of the heat pipe 11 by a section D in which non-condensable gas is generated, and the top and bottom are open to the heat dissipation fin 12 closest to the heat dissipation side end 11a of the heat pipe 11. A heat dissipation structure for a heat pipe, characterized in that a U-shaped cover fin 16 is provided and the heat dissipation side end 11a of the heat pipe 11 is surrounded by the cover fin. 2. The heat dissipation structure of a heat pipe according to claim 1, wherein the distal end heat dissipation fin 17 is provided on the heat dissipation fin 12 closest to the heat dissipation side end portion 11a of the heat pipe 11 in parallel with the cover fin 16.