JPH0537505Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a heat radiator used, for example, as a heat radiator for a positive temperature coefficient thermistor heating element.

BACKGROUND TECHNOLOGY Conventionally, as this type of heat dissipation body, for example, the fifth
As shown in FIG. 6 and FIG. 6, a pair of heat dissipating members 51, 51 made of extruded multi-hole members are known in which they are overlaid with each other and integrated by brazing. This heat radiator uses the inner surface of the hole of each heat radiating member 51, 51 as a heat radiating surface, and heat is radiated through this heat radiating surface.

Problem to be solved by the invention By the way, in a heat dissipating body made of a multi-hole extruded material, in order to increase the heat dissipation area, the number of holes is increased as much as possible, but due to the extrusion method, there are certain Due to this limitation, it is difficult to secure a sufficient heat dissipation area. Therefore, in conventional heat radiators, the heat radiating area is secured by combining a plurality of heat radiating members 51, 51 as described above, but it is not as perfect as before, and this conversely makes the heat radiator large. It was also the cause of the change.

In addition, due to the increased size and the use of multi-hole extruded shapes, the heat radiator described above requires a large amount of material, which increases the cost and weight of the heat radiator. was.

This idea was made in view of the above-mentioned drawbacks, and its purpose was to secure a large heat dissipation area and at the same time to achieve miniaturization, which would further reduce costs and reduce weight. The object of the present invention is to provide a heat dissipation body that can be used in various ways.

Means for Solving the Problems In order to achieve the above-mentioned object, the heat dissipating body of this invention is characterized in that corrugated fins are disposed within a cylindrical body made of a hollow extruded member.

Embodiments Hereinafter, embodiments of the heat sink of this invention will be described based on the drawings.

1 and 2 show a first embodiment of this invention. In the figure, 1 is a cylindrical body made of a hollow extruded member, 2 is a partition plate, and 3 is a corrugated fin. Each member is made of aluminum or aluminum alloy, for example.

The cylindrical body 1 has a rectangular cross-sectional shape, and grooves 4, 4 extending from one end opening to the other end opening are provided on both internal walls, respectively, and the partition plate 2 is connected to the cylindrical body 1. It is inserted through the opening with its both ends fitted into the grooves 4, 4, and is used to divide the interior of the cylindrical body 1 into two upper and lower chambers. Corrugate Fins 3 and 3 are inserted into these rooms, respectively. The corrugated fins 3, 3 are made of, for example, an aluminum brazing sheet, and in the above-mentioned assembled state are integrated by brazing and constituted as a heat radiating body. Note that 5 is a terminal attachment part.

This heat radiator is used as a heat radiator constituting, for example, a hot air heater using a positive temperature coefficient thermistor.
That is, one surface of the positive temperature coefficient thermistor element is attached in contact with either the upper or lower outer surface of the heat radiator as an electrode surface, and a similar heat radiator is attached in contact with the other surface of the element. By applying a voltage between each heat radiator, the PTC thermistor element generates heat, the heat is transmitted to each heat radiator, and forced convection of the air converts the air into warm air.

As described above, in the above-mentioned heat dissipation body, the corrugated fins 3, 3 are disposed within the cylindrical body 1 made of a hollow extruded shape, so the heat dissipation is better than that of the conventional one made of a multi-hole extruded shape. It is possible to secure a significantly larger area, and at the same time it is possible to achieve a reduction in size.Furthermore, along with this, the amount of constituent materials used can be reduced, making it possible to reduce costs and weight.

Further, since the size of the heat radiation area can be changed simply by changing the fin pitch of the corrugated fins 3, heat radiation bodies with different heat radiation areas can be manufactured in the same size.

Furthermore, in the above embodiment, the interior of the cylindrical body 1 is divided into a plurality of rooms by the partition plate 2, and the corrugated fins 3, 3 are arranged in each room, so that heat can be dissipated without increasing the size. It is possible to make the area even larger.

Further, in the above embodiment, the corrugated fins 3, 3, etc. only need to be inserted into the cylindrical body 1, and in the inserted state, the periphery is surrounded by the cylindrical body 1, so that accurate positioning is possible. Therefore, the members can be assembled easily and accurately during brazing, and productivity can be improved.

Furthermore, in the above embodiment, since the rectangular cylindrical body 1 is manufactured from a hollow extruded material, the cylindrical body 1 can be formed into a rectangular shape by bending a plate. The corners of the corrugated fins do not bulge outward, so that the contact with the corrugated fins 3 and 4 at that part is perfect, and it is possible to prevent partial brazing failure. be.

3 and 4 show a second embodiment of this invention. In this embodiment, the corrugated fins 3 are directly connected to the cylindrical body 1 without using the partition plate 2.
It is inserted inside and integrated by brazing.
Note that the other parts are substantially the same as those in the above embodiment, so the same parts as in the above embodiment are given the same reference numerals, and the explanation thereof will be omitted. This heat radiator also provides the same effects as those of the above embodiment.

As in the above embodiments, the cylindrical body 1, corrugated fins 3, 4, etc. are generally joined together by brazing, but the present invention is not limited to this.

Effects of the invention As described above, the heat dissipation body of this invention has corrugated fins disposed within a cylindrical body made of a hollow extruded member, so compared to the conventional one made of a multi-hole extruded member, It is possible to secure a significantly larger heat dissipation area, and at the same time, it is possible to achieve a reduction in size.Furthermore, with this, the amount of constituent materials used can be reduced, making it possible to reduce costs and weight.

Furthermore, since the heat radiation area can be changed by increasing or decreasing the fin pitch of the corrugated fins, it is possible to configure heat radiation bodies of the same size but with different heat radiation areas.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the heat sink of this invention, FIG. 2 is an exploded perspective view of the heat sink shown in FIG. 1, and FIG. 3 is a perspective view of a second embodiment of the heat sink of this invention. 4 is an exploded perspective view of the heat radiator shown in FIG. 3, FIG. 5 is a perspective view of a conventional heat radiator, and FIG. 6 is an exploded perspective view of the heat radiator shown in FIG. 1...Cylindrical body, 3...Corrugated fin.

Claims (1)

[Scope of utility model registration request] A heat sink consisting of corrugated fins placed inside a cylindrical body made of a hollow extruded material.