JPS5840613Y2 - heat sink - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a heat sink.

In general, aluminum has excellent thermal conductivity and a large heat dissipation effect, so it is used as a heat dissipation plate for various heat generating components.

However, since aluminum is a soft material, heat generating components such as transistors could not be directly fixed with tapping screws or the like.

Therefore, in the past, it was difficult to fix heat-generating parts such as transistors, which increased the number of man-hours, poor assembly workability, and made it difficult to replace parts.

An example of this is shown in FIG. In the figure, screws 3, 4, insulating tubes 5, 6, insulating paper 7, spring washers 8, 9, and nuts 10, 11 are used to insulate and attach a transistor 2 to an aluminum heat sink 1.

Note that 1 a, 1 b, 2 a, 2 b, 7 a and 7 b are push-through insertion holes, and 1 C and 1 d are lead wire insertion holes of the transistor 2.

As can be seen from the example in FIG. 1, attaching the aluminum heat sink 1 of the transistor 2 was extremely difficult and required a large number of man-hours, and the assembly workability was poor, making it difficult to replace parts.

Therefore, an object of this invention is to provide a heat radiator with good assembly workability and easy parts replacement.

An embodiment of this invention is shown in FIGS. 2 and 3.

That is, as shown in FIG. 2, this heat sink has an iron plate 13 fixed to one side of an aluminum heat sink 12, and a transistor 14 arranged on the other side of the aluminum heat sink 12 with an insulating sheet 15 such as a mica sheet interposed therebetween. , transistor 14
The insulation tubes 16 and 17 are connected to the insulation tube insertion holes 14a and 14b of the insulation sheet 15, the insulation tube insertion holes 15a and 15b of the insulation sheet 15, and the insulation tube insertion holes 12a and 12b of the aluminum heat sink 12, respectively, and tapped. The transistor 14 is insulated and attached to the aluminum heat sink 12 by inserting the transistors 18 and 19 into the insulating tubes 16 and 17 and screwing them into the tapping screw holes 13 a and 13 b of the iron plate 13. It is.

In this case, the iron plate 13 is fixed to the aluminum heat sink 12 by inserting its projecting piece 13C into the through hole 12C of the aluminum heat sink 12 and twisting or bending it.

Further, as shown in FIG. 3, a recess 12d is formed at the opening edge of the insulating tube insertion hole 12a of the aluminum heat sink 12 on the iron plate 13 side, and iron powder 20 generated when the tapping screw 18 taps the iron plate 13. This prevents the iron powder 20 from entering between the aluminum heat sink 12 and the insulating sheet 15 and between the insulating sheet 15 and the transistor 14 through the insulating tube insertion hole 12a outside the typing/pin. When the tapping screw 18 is strongly tightened, the iron powder 20 is prevented from breaking through the insulating sheet 15 and causing a short circuit between the transistor 14 and the aluminum heat sink 12, and the same applies to the insulating tube insertion hole 12b. ing.

Note that 12e and 12f are lead wire insertion holes for the transistor 14.

In this way, the transistor 14 can be reliably attached to the aluminum heat sink 12 with a simple configuration in which the tapping screws 18 and 19 are screwed onto the iron plate 13 fixed to the aluminum heat sink 12, and the assembly work efficiency is improved. , parts replacement becomes easy.

In addition, since recesses 12d are provided at the opening edges of the insulation tube insertion holes 12a and 12b on the iron plate 13 side, the tapping screw 1
Iron powder 20 generated when 8.19 taps the iron plate 13 accumulates in the recess 12d, so that the iron powder 20 passes through the insulating tube insertion holes 12a and 12b during tapping to the aluminum heat sink 12 and the transistor. 14 and the insulating sheet 15, therefore, there is no gap between the aluminum heat sink 12 and the transistor 14, and the tapping screw 1
Even if 8.19 is strongly tightened, the transistor 14 and the aluminum heat sink 12 will not be short-circuited.

As described above, the heat sink of this invention has chips of the hard plate stuck to one side of the soft heat sink at the opening edge on the hard plate side of the through hole of the soft heat sink through which the tapping screw for fixing the heat generating component passes. Since it is provided in the recessed part to accommodate the hard plate, it is easy to assemble and replace the parts.Furthermore, the chips generated from the hard plate during tapping are collected in the recessed part, and the chips are removed from the hard heat sink. Chips no longer enter between the heat sink and the heat sink through the through holes, and there is no longer a gap between the heat sink and the soft heat sink, and when the self-tapping screws are tightened strongly, chips can no longer pass through the insulation sheet. This has the effect of preventing a short circuit between the heat sink and the heat-generating component by breaking through the heat sink.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a conventional example, and FIGS. 2 and 3 are an exploded perspective view and an assembled sectional view of an embodiment of this invention, respectively. 12... Aluminum heat sink, 12 a, 1
2 b...Insulation tube insertion hole, 12C...
Through hole, 12d... Concavity, 13... Steel plate, 13 a, 13 b... Tapping screw hole, 13C... Protruding piece, 14. ...Transistor, 14a, 14b...Insulation tube insertion hole, 15...Insulation sheath), 15a, 15b.
... Insulation tube insertion hole, 16.17 ... Insulation tube, 18.19 ... Tapping screw, 20 ...
····Chips.

Claims (1)

[Scope of utility model registration request] A concave portion is provided on the hard plate side opening edge of the through hole of the soft heat sink through which the tapping screw for fixing the heat generating component passes through, for accommodating chips of the hard plate fixed to one surface of the soft heat sink. Heat sink.