JP2001127221A - Method of fitting extruded materials together and heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-performance heat sink which is inexpensive and equipper with fins that are high in mounting density and small in width, a method wherein two heat sink fins and a base are fitted together at a normal temperature without using adhesive agent. SOLUTION: An extruded material provided with projections and another extruded material provided with recesses corresponding to the projections are fitted together. The adjacent recessed openings are different from each other in height, and a part of the tip of the inlet of the opening resides in the penetration path of the fitting recessed part. Stress is induced in the projection from two directions which are not on the same line and imposed on the protrudent contact from the inlet of the opening when the projections are press-fitted into the recesses to enable the two extruded materials to be connected together. The two extruded materials are each provided with a fin which dissipates heat and a base where a heat releasing element is mounted to serve as heat sinks, and the heat sinks are joined together into a heat sink with a hollow fitting the tips of the fins of the one heat sink into the corresponding recessed contacts of the other heat sink.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink for cooling a Peltier device such as a transistor which is a semiconductor device used for a high-output inverter or the like.

[0002]

2. Description of the Related Art Conventionally, it is necessary to form as many thin fins as possible to have a limited area in order to increase the heat radiation surface area. However, due to the limitation of extrusion technology, fins of 1 m or less are formed and 2 mm in width. It was difficult to make a plurality of the following hollow parts. For this reason, two heat sinks are superposed to produce a heat sink that compensates for this drawback, but in order to make the fins and the base come into contact with each other, they have been soldered or bonded using an adhesive. Therefore, it was expensive in terms of price.

[0003]

SUMMARY OF THE INVENTION The present invention reduces the fin spacing density and fin width by fitting two heat sink fin portions and a base portion under pressure at room temperature without using an adhesive, and at a low cost. It is to provide a high performance heat sink.

[0004]

According to the present invention, the height of the left and right entrances of the concave opening is different from that of the other extruded material provided with a concave portion corresponding to the convex portion of one extruded material. And at least one of the openings has at least a part of the opening, and the opening is formed in the convex portion press-fitted when the press-fitting of the convex portion and the concave portion is completed in the approach path of the concave portion to be fitted. A method for joining two extruded materials, wherein two extruded materials are engaged with each other by a stress from both directions that are not on the same line with respect to the contact portion of the convex portion.

According to the present invention, the height of the left and right entrances of the concave opening is different from each other when fitting with the other extruded material having a concave portion corresponding to the convex portion of one extruded material. The convex portion from the entrance of the opening, which is generated in the convex portion press-fitted when the press-fitting of the convex portion and the concave portion is completed because the part of the front end of the opening is in the approach path of the concave portion to be fitted. The two extruded materials are joined together by a stress from both directions that are not on the same line with respect to the contact portion. In the method of joining extruded materials, the two extruded materials are mutually attached to a fin that dissipates heat and a base surface on which a heating element is mounted. A heat sink provided with a concave portion corresponding to the tip of the fin, and the concave portion of another heat sink corresponding to the fin tip of the heat sink. A heat sink assembly method characterized by assembling a heat sink having a hollow portion formed by fitting it into parts.

According to the present invention, the height of the left and right entrances of the concave opening is different, and at least one of the above-mentioned ones is different in fitting with the other extruded material having a concave portion corresponding to the convex portion of one extruded material. The convex portion from the entrance of the opening, which is generated in the convex portion press-fitted when the press-fitting of the convex portion and the concave portion is completed because the part of the front end of the opening is in the approach path of the concave portion to be fitted. The two extruded materials are joined together by a stress from both directions that are not on the same line with respect to the contact portion. In the method of joining extruded materials, the two extruded materials are mutually attached to a fin that dissipates heat and a base surface on which a heating element is mounted. A heat sink provided with a concave portion corresponding to the fin tip of the other heat sink, and contacting the concave portion of another heat sink corresponding to the fin tip of the heat sink. A heat sink assembly method characterized by assembling a heat sink having a hollow portion formed by fitting it into parts.

[0008]

According to the present heat sink, the height of the left and right entrances of the concave opening is different in fitting with the other extruded material having a concave portion corresponding to the convex portion of one extruded material.
And at least one opening of the opening is formed in the projecting portion which is press-fitted when the press-fitting of the projecting portion and the recessed portion is completed by being in the approaching path of the recessed portion to be fitted with the leading end of the opening. The two heat sinks are engaged with each other by the stress from the two directions that are not on the same line with respect to the contact portion of the convex portion, whereby a heat sink having a hollow portion having many fins can be manufactured.

[0009]

An embodiment will be described with reference to the drawings. FIG. 1 is a view of an upper part (1) and a lower part (2) of a product of the present invention before being joined by two heat sinks made of an extruded aluminum material or the like according to the present invention. The fitting portions (3) at both ends of the heat sink are provided to protect the fitting of the fitted fin and the base portion from shocks and the like, since the fitting condition varies depending on the thickness of the fin and the tolerance of the concave portion of the fitting portion, and keep the fitting. It is a joint and is fastened at the same time when two heat sinks are fitted. This may be a fastening such as a bolt or a caulking.

FIG. 2 is an enlarged view of the fin tips of the two heat sinks and the corresponding concave portions provided on the base. FIG. 3 is an enlarged view of part A of the enlarged view of FIG.
(5) is a protrusion at the entrance of both ends of the concave portion, and the value α in this figure represents the difference between the heights of both walls at the entrance of the concave portion where the tip of the fin provided on the base is fitted. The value β is a shift value with respect to the course of the fin tip when the fin tip is pressed into the corresponding concave portion. In other words, when the fin tip is fitted into the corresponding concave portion, the value β is equal to the value of β. The course changes.

In FIG. 4, (a) to (c) show how the tip of the fin is fitted into a concave portion provided on the corresponding base. In (a), the tip of the fin is the contact point 1 of the opening just before fitting into the corresponding concave portion.
The contact 2 is then bent in the opposite direction, and then the contact 2 in the opposite direction is bumped in (b) in a direction opposite to the contact 1 and not in the same line. In (c), the tip of the fin is fitted into the corresponding concave portion, but receives stress from the contact points 1 and 2, so that the fin tip and the concave portion maintain the fitting force due to these stresses. (D) shows how a non-collinear stress is applied to the fin tip in the fin tip that occurs in the coupling step from (a) to (c). Due to the non-collinear stresses shown here,
The fin is fitted to the base by the leverage principle.

Further, even if the width t1 of the fin tip is smaller than the width t of the corresponding concave upper portion (6), the width α of the opening can be reduced.
The values can be matched by changing the value and β value.

According to the heat sink of the present invention, a heat sink which is more compact and less expensive than the conventional heat sink can be supplied.

[0013]

[Brief description of the drawings]

FIG. 1 is a view of a heat sink before fitting.

FIG. 2 is a partially enlarged view of FIG. 1;

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is a diagram showing a fitting process of a fin tip portion and a concave portion on a base and a principle diagram thereof.

FIG. 5 is a front view and a left side view of the heat sink.

FIG. 6 is a plan view and a bottom view of the heat sink.

FIG. 7 is a perspective view of the heat sink.

[Explanation of symbols]

FIG. 1 1. Upper heat sink 2, Lower heat sink 3, Heat sink connection

[Fig. 2] 1, upper heat sink 4, lower heat sink A

[Fig. 3] 5. Opening entrance left and right 6. Concave part

4; 7, fin tip portion 8, concave portion 9,

FIG. 5 1. Upper heat sink 2, Lower heat sink

FIG. 6: 1, upper heat sink 2, lower heat sink

FIG. 7: 1, upper heat sink 2, lower heat sink

Claims (3)

[Claims] 1. An extruded member having a concave portion corresponding to a convex portion of one extruded material, and the height of the concave opening left and right entrances is different from each other, and at least one of the openings is different. The convex portion contact portion from the opening entrance, which is generated in the convex portion press-fitted when the press-fitting of the convex portion and the concave portion is completed by being in the approach path of the concave portion where a part of the tip of the entrance fits. Characterized in that two extruded materials are engaged with each other by a stress from both directions which are not on the same line with respect to the extruded materials. 2. The heat extruder according to claim 1, wherein the two extruded members are heat sinks provided with concave portions corresponding to the respective fin tips on the base surface on which the radiating fin and the heating element are mounted. A method for assembling a heat sink, comprising: assembling a heat sink having a hollow portion formed by fitting the concave portion contact portion of another corresponding heat sink. 3. The heat extruder according to claim 1, wherein the two extruding members are heat sinks provided with concave portions corresponding to the respective fin tips on the base surface on which the radiating fin and the heating element are mounted. A heat sink having a hollow part formed by fitting the concave part contact part of the other corresponding heat sink into a heat sink.