JP2572766Y2 - heatsink - Google Patents

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 semiconductor device or the like, and more particularly to a heat sink having a novel structure which has a high heat radiation efficiency and can easily be manufactured with various heat radiation capacities.

[0002]

2. Description of the Related Art In order to sufficiently exhibit the performance of a semiconductor element, particularly an element having a large heat loss such as a large power element,
It is necessary to efficiently dissipate the generated heat and keep the temperature of the element below a predetermined operating temperature. Heat sinks are commonly used as an effective means of increasing the heat dissipation of a device and lowering it below a predetermined operating temperature. In a conventional heat sink, a plurality of comb-shaped grooves are provided on one surface of a base member, and the element is mounted on the other flat surface. The heat radiation of the heat sink is performed by convection and radiation heat transfer from the outer surface of the base member to the surrounding air. However, since the main heat radiation is by convection, the heat radiation capacity (the amount of heat radiation per unit time) is increased. For this reason, forced cooling by a fan or the like is widely used.

[0003]

However, since the heat radiation area of such a conventional heat sink is substantially determined by the entire surface of the comb, the heat radiation efficiency is not so high. There is a problem that the rate of increase of the wall length of the part must be increased. In addition, there is a problem that it is necessary to prepare a base member having a different length for each required heat radiation capacity. In view of the above problems of the conventional heat sink, the present invention has an object to provide a heat sink having a novel structure which has a high heat radiation efficiency and can easily manufacture a heat sink having various heat radiation capacities. It is.

[0004]

In order to solve the above-mentioned problems, a heat sink according to the present invention has a base member having a plurality of mutually parallel grooves formed on one surface, and a widthwise end portion fitted into an arbitrary groove. A number of partitions are integrally formed in the axial direction, and a plurality of flat tubes whose both ends in the axial direction are open. And a corrugated fin arranged in the longitudinal direction of the groove. In a preferred embodiment of the present invention, the corrugated fins are coated with brazing material on both sides, a part of which is interposed between the flat tube and the groove, and the brazing material is melted in the furnace and then melted. Each component is solidified and integrally joined.

[0005]

The heat radiating action of the heat sink of the present invention is performed by the outer surface of the base member to which the element is mounted, the flat tube and the corrugated fin. That is, the generated heat of the element transferred to the base member is radiated from the periphery of the groove and the like, and is radiated to the periphery from the outer surface and the partition portion of the flat tube. Further, heat is transferred from the flat tube to the corrugated fin, and is radiated from the surface. In addition, since the flat tube is fitted and joined to the groove of the base member, the heat conductivity is good. Since the flat tube 3 has a plurality of partitions, the surface area per occupied area is extremely large and the heat radiation rate is high. In addition, since the corrugated fin is joined to the corrugated fin, the heat radiation efficiency is further increased.

Therefore, the heat sink of the present invention can reduce the volume for obtaining the same heat radiation capacity as compared with the conventional heat sink. In particular, when forced cooling is performed by flowing cooling air in the axial direction of the base member, the effect is significantly increased. The heat radiation capacity can be changed by changing the number of flat tubes connected to the groove of the base member, changing the number of corrugated fins, the fin pitch, and the like.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a front view showing an example of the heat sink of the present invention, FIG. 2 is an enlarged view of a main part thereof, showing an assembled state before brazing, and FIG. 3 is a perspective view of another embodiment of the heat sink of the present invention. FIG. In the heat sink of each embodiment, a plurality of flat tubes 3 are arranged between a pair of upper and lower base members 2, and corrugated fins 5 are in contact between the flat tubes 3. The components are integrally brazed and fixed. The base member 2 has a plurality of grooves 1 formed in a comb shape and parallel to each other. The base member 2 is made by extruding a metal material having good heat conductivity such as aluminum or an alloy thereof. One surface is a flat surface, the semiconductor element 8 is mounted, and the other surface is integrally provided with a comb-shaped groove. The width of the groove is slightly larger than the width of the flat tube 3 and
It is preferable that both have substantially the same shape. The base member 2 is provided with a plurality of holes 11 for attaching to a frame (not shown) or a printed board as shown in FIG.

The flat tube 3 has a plurality of partitions 7 parallel to each other in the minor axis direction of the cross section. Such a flat tube 3 is manufactured by extruding a metal material such as aluminum, and a multi-hole tube that is widely used as an evaporator for a cooling device of an automobile or the like can be used. . The partition 7 may be arranged not only in the minor axis direction of the cross section but also in the major axis direction of the cross section. However, the plane of the partition 7 must be parallel to the axial direction of the flat tube. The flat tube 3
Both ends in the width direction are fitted into the grooves 1 of the base member 2.
Next, as shown in FIG. 2, the corrugated fins 5 disposed between the flat tubes 3 are made of aluminum or an alloy thereof in which a brazing material 6 is coated on both surfaces of a core material 10. This fin material can be manufactured by bending a strip material having a thickness of about 0.05 to 0.2 mm. As the core material 10 of the corrugated fin 5, for example, A3003 of aluminum material can be used, and A4004 can be used as the brazing material 6. In addition, the base member 2 and the flat tube 3
003, A6063, and A7N02 can be used.

In this embodiment, both ends of the corrugated fins 5 in the traveling direction of the corrugated fins 5 are elongated, and the portions are interposed between the flat tube 3 and the groove 1 of the base member 2 as shown in FIG. Can be Then, the whole is assembled and fixed with a jig (not shown), and the assembly is heated in a vacuum furnace to melt the brazing material on the fin surface, and then solidify and braze and fix the whole integrally. The heat sink of the present invention can be manufactured. In FIG. 2, the end of each corrugated fin 5 is arranged only between the end of the adjacent flat tube 3 and the groove 1 as shown by a solid line. The portion may be further extended and connected between each flat tube 3 and the groove 1 as shown by a chain line in FIG. Next, FIG.
In this embodiment, corrugated fins are arranged only in a space surrounded by each flat tube. This prevents the corrugated fin from being deformed. The forced cooling air 12 shown in FIG. 3 flows in such a heat sink in the direction of the arrow. The forced cooling air 12 is sent by a fan or the like. Then, the forced cooling air 12 flows through the inside of each flat tube 3 and all the outer peripheral surfaces of the corrugated fins 5 and the base member 2.

[0010]

[Effects of the Invention] The heat sink of the present invention has the above-described structure, and has the following effects. (1) The generated heat of the element transmitted to the base member is transmitted to the groove side wall and the like and is radiated to the periphery, and is also transmitted to the flat tube and radiated to the periphery from the surface and the plurality of partition plates. Further, heat is transferred from the flat tube to the corrugated fins and radiated from its surface, so that the heat radiation effect is significantly increased. Therefore, the occupied area for obtaining the same heat radiation amount can be reduced as compared with the conventional heat sink. (2) Since the end of the flat tube is fitted and joined to the groove of the base member, the joining is easy and a high joining strength can be obtained. (3) The heat radiation capacity of the heat sink can be easily changed by changing the number of flat tubes joined to the groove of the base member. Therefore, heat sinks having different heat dissipation capacities can be easily manufactured using common components, and the number of components used can be reduced, and the manufacturing cost can be reduced.

(4) In addition, since the width direction of the corrugated fin is arranged in the axial direction of the flat tube and the partition portion of the flat tube is arranged in the same direction, the air is blown in the axial direction of the flat tube. Thus, the cooling effect can be dramatically improved. That is, the inner and outer surfaces of the flat tube, the corrugated fins, and the outer surface of the base member are all efficiently cooled. (5) Next, in the invention according to claim 2, a brazing material is previously coated on both surfaces of the corrugated fin, and the fin and the flat tube are joined using the brazing material, and at the same time, a part of the fin is removed. Since the end of the flat tube and the base member are integrally joined, the heat sink is easy to manufacture, has high brazing strength, and has high reliability.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a heat sink of the present invention.

FIG. 2 is an explanatory view of an assembly for manufacturing the heat sink.

FIG. 3 is a perspective view of a heat sink according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Groove 2 Base member 3 Flat tube 4 Bent part 5 Corrugated fin 6 Brazing material 7 Partition part 8 Semiconductor element 10 Core material 11 Hole 12 Forced cooling air

Claims (2)

(57) [Scope of request for utility model registration] 1. A base member (2) having a plurality of mutually parallel grooves (1) formed on one surface, and a widthwise end fitted to any of the grooves to be joined and joined together. A large number of partition portions are integrally formed in the direction, and a plurality of flat tubes (3) having both ends opened in the axial direction are joined to a bent portion (4) on the outer surface of the flat tube. Corrugated fins (5) arranged in the longitudinal direction of the groove
And a heat sink comprising: 2. The corrugated fin (5) according to claim 1, wherein both surfaces of the corrugated fin (5) are coated with a brazing material.
A heat sink in which a part thereof is interposed between the flat tube (3) and the groove, and the brazing material is melted and solidified in a furnace, and the components are integrally joined.