JPS6229828Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a heat exchanger suitable for use in water-cooled engine oil coolers used in automobiles, etc., and its purpose is to improve the inner periphery of the tube unit of the heat exchanger. An object of the present invention is to provide a heat exchanger in which parts can be reliably brazed.
The conventional tube unit of this type of heat exchanger consists of two upper and lower cooling plates, into which brazing metal foils are inserted in advance, one at the top and one at the top, and vacuum brazed together with the inner fins. be done. In such a structure, it may be necessary to increase the gap between the end of the inner fin and the cooling plate for the purpose of reducing oil flow resistance. In this case, a problem arises in that the brazing part of the tube unit cannot be reliably brazed. The reason for this is thought to be that the melted brazing material during vacuum brazing concentrates on the inner fin part due to capillary action, making it difficult for the brazing material to collect in the brazing part of the tube unit, resulting in poor brazing. .

The present invention has been made in view of the above points, and by providing a plurality of convex portions at the end of the tube unit, the convex portions are brought close to the inner fin, and
The purpose is to allow the brazing material to collect in the brazed portion of the tube unit, thereby eliminating brazing defects.

The present invention will be described below with reference to embodiments shown in the drawings. The illustrated embodiment shows an example in which the present invention is applied to an oil cooler for a water-cooled automobile engine.
In FIGS. 1 to 5, a mounting bracket 1 made of metal such as iron has a hole 1A for mounting to an engine block.
A tube unit 3 formed of cooling plates 3A, 3B, etc. made of metal such as stainless steel is integrally attached via a spacer 2 made of metal such as iron.

The tube unit 3 includes two cooling plates 3A and 3B placed opposite each other to form an oil passage 4, an inner fin 7 made of metal such as iron inserted into the oil passage 4, and a reinforcing material. 5 and a brazing filler metal foil 10 made of copper or the like is attached thereto and the circumference is tightened. A plurality of similar tube units 3 (two in this example) are laminated with plates 6 of iron or the like interposed therebetween and brazed together.

Mounting bracket 1 has oil inlet hole 1C and outlet hole 1.
D is formed, and each cooling plate 3A, 3
B has an oil inlet hole 3C corresponding to the above holes 1C and 1D.
and an oil outlet hole 3D are formed, and the lubricating oil heated to high temperature by the engine flows into the oil cooler from the oil inlet hole 1C of the mounting bracket 1 as shown by the arrow A, and flows through the cooling plates 3A and 3B. The oil is discharged from the oil inlet hole 3C through the oil passage 4 and through the oil passage holes 3D and 1D as shown by arrow A'. On the other hand, the cooling water flows along the outside of the cooling plates 3A and 3B as shown by arrows B and B' and exchanges heat with the lubricating oil in the oil passage 4. In the drawings, reference numeral 8 indicates a reinforcing end plate.

Next, the detailed structure of the cooling plates 3A, 3B will be explained with reference to FIGS. 3, 4, and 5. The cooling plates 3A and 3B are formed by pressing thin stainless steel plates that are continuously conveyed. Of the pair of cooling plates 3A and 3B, the cooling plate 3A whose outer peripheral edge is located inside is During the press working, a plurality of convex portions 3A1 are integrally formed on the outer peripheral edge so as to have a U-shaped cross section (FIG. 5). Due to the presence of this convex portion 3A1, the tip of the convex portion 3A1 and the inner fin 4 are brought close to each other as shown in FIG.
As a result, the brazing filler metal melts into the brazed portion 3 of the tube unit.
It also gathers in AB, allowing the brazing portion 3AB to be well brazed. In other words, it is possible to set the gap L between the end of the cooling plate convex portion 3A1 and the inner fin 7 to an appropriate size, and the brazing material melted during vacuum brazing flows toward the inner fin 7 side due to capillary action and is cooled. The cooling plate joint 3 is distributed between the joints 3AB of the plates 3A and 3B, and does not have the problem of being biased towards the inner fin 7 as in conventional products.
AB brazing becomes better.

Further, by forming the convex portion _3A1 , an oil passage having a width corresponding to at least the amount of protrusion of the convex portion _3A1 can be formed between the end of the inner fin 7 and the inner wall of the outer peripheral edge portion 3A. . As a result, the flow resistance of oil flowing in this passage can be reduced.

In the above-described embodiment, the shape of the convex portion 3A1 of the cooling plate 3A is rectangular, but it may be other shapes such as a triangle or a semicircle.

[Brief explanation of the drawing]

The drawings show an embodiment of the heat exchanger of the present invention, in which Fig. 1 is a longitudinal sectional view, Fig. 2 is a bottom view of Fig. 1, and Fig. 3 is a cutaway perspective view of section C in Fig. 2. FIG. 4 is a perspective view of the cooling plate, and FIG. 5 is a sectional view taken along the line DD in FIG. 4. 3...Tube unit, 3A, 3B...Cooling plate, 3A1...Protrusion, 4...Fluid passage, 7...Inner fin.

Claims (1)

[Claims for Utility Model Registration] A utility model comprising: a pair of cooling plates disposed facing each other to form a fluid passage; and an inner fin disposed within the circulation passage formed by the pair of cooling plates. In the heat exchanger, the pair of cooling plates and the inner fin are fixed by brazing by melting and solidifying a brazing material sheet disposed between the cooling plate and the inner fin, wherein the cooling plate is attached to an outer peripheral portion of the heat exchanger. The outer circumferential edge of one of the pair of cooling plates surrounds the outer circumferential edge of the other cooling plate, so that the two are integrally assembled. A plurality of convex portions are formed on the outer circumferential edge portion of the pair of cooling plates, which is located on the inner side, and is bent from the tip thereof toward the inner fin side. Heat exchanger.