JPH0435743Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a stacked heat exchanger in which so-called drawn cup elements are stacked, and relates to a boss mounting structure that constitutes fluid inflow and outflow holes.

[Prior art]

A stacked heat exchanger consists of a pair of upper and lower metal plates, each element of which has an elongated planar shape, and the periphery of each metal plate is raised to form a hollow body. The inner and outer surfaces of each metal plate are coated with a brazing cladding material in advance. While these elements are stacked, a side member made of double-sided cladding material is stacked on the outermost side, and a boss portion is placed on top of the side members, and the respective parts are fastened and fixed using a suitable jig. Then, they were inserted into a high-temperature furnace, the brazing material was melted, and then solidified, and the parts were integrally brazed and fixed to complete a stacked heat exchanger. However, according to this method, traces of melting of the brazing material are formed in a pattern on the outer surface of the side member, making the overall appearance of the heat exchanger unsightly.

In order to solve this problem, the idea described in Japanese Utility Model Publication No. 58-12059 uses a metal plate without any brazing material on the outer surface of the side member, and a separate brazing material is used between each side member and the boss. Proposals have been made to manufacture heat exchangers by interposing adhesive materials. However, this method requires new parts to be brazed, which increases the number of parts, and the assembly itself is troublesome.

[Means to solve the problem]

Therefore, the present invention aims to provide a boss mounting structure that eliminates the above-mentioned problems, and its gist is as follows.

A plurality of elongated planar elements 2 each having a communication hole 1 perforated in the thickness direction at the end thereof are stacked, and
A side member 4 having a hole 3 formed at an end thereof aligned with the communication hole 1 is superimposed on the outermost element 2 in the stacking direction, and a boss portion 5 is located at the edge of the communication hole 1. In the boss mounting structure of a laminated heat exchanger in which each of these members is integrally brazed, the element 2 is composed of a pair of opposing press-formed metal plates with brazing filler metal 6 clad on both sides. and the hole edge of the communication hole 1 of the outermost element is raised outward within the hole 3 of the side member 4 or extends in the radial direction within the hole 3 of the side member 4. a metal plate which forms a joint surface 7 for a boss, the element side of the boss portion 5 is joined to the joint surface 7, and further, at least the outer surface of the side member 4 in the lamination direction is not clad with a brazing material. It is characterized by the use of

Therefore, according to this structure, a minimum number of parts is required, and assembly for brazing is easy. Furthermore, since the boss portion 5 and the element 2 are directly brazed, a highly reliable and reliable liquid-tight structure is formed. In addition, it is possible to obtain a heat exchanger with good appearance without wax flow pattern on the outer surface of the side member.

〔Example〕

Next, one embodiment of the present invention will be described based on the drawings.

This embodiment is an embodiment of an oil cooler for an automobile, and its elements are constructed as shown in FIG. That is, it is made up of a pair of upper and lower metal plates formed by a press machine to be elongated, and each metal plate is overlapped to form a corrugated convex shape 9 that intersects with each other. Therefore, oil enters each element through one of the communicating holes (not shown) and travels in a zigzag pattern along each of the corrugated protrusions 9 of the upper and lower metal plates. The oil is configured to flow out from the other communication hole (not shown). Furthermore, the opposing elements are stacked so that the wave-shaped convex shapes 9 intersect with each other, and are configured such that cooling water or cooling air can flow between them.

Here, FIG. 1 is a longitudinal sectional view of a first embodiment of the boss mounting structure of the present invention. As is clear from the figure, the metal plates constituting each element 2 are coated on both sides with brazing filler metal 6 in advance. Furthermore, the side members 4 are either not coated with any brazing material or are coated only with brazing material on the inner side. The outermost element 2 has its communication hole raised outward to form a cylindrical boss joint surface 7. Next, a ring-shaped groove is formed in the boss portion 5 so as to match the aforementioned cylindrical shape, and a fitting convex portion 8 is formed inside the ring-shaped groove. Thus, each element 2 and side member 4 are laminated. Then, the fitting convex portion 8 of the boss portion 5 is fitted into the cylindrical joint surface, and these are integrally tightened using a jig (not shown). Then, the parts are inserted into a vacuum furnace or an inert gas-filled furnace, and the brazing material is melted and then solidified to integrally braze and fix each part, thereby completing the laminated heat exchanger. Therefore, according to the first embodiment, the boss portion 5 and the element 2 are brazed together on both the inner and outer joint surfaces thereof.

Next, FIG. 2 shows a second embodiment of the present invention, in which the cylindrical portion of the element 2 is provided with a shorter protrusion than that of the first embodiment. According to this embodiment, the inner surface of the cylindrical portion and the fitting convex portion 8 of the boss portion 5 are brazed and integrated.

Next, FIG. 4 is a longitudinal cross-sectional view of a main part showing a third embodiment of the present invention. In this embodiment, the hole edge of the outermost element 2 is raised up into a cylindrical shape, and its upper end is bent outward into an L-shaped cross section. Then, a boss joint surface 7 is formed on the cylindrical rising surface and the flange-like upper surface. By doing so, the brazing area of the boss portion 5 with the outermost element 2 is increased, and the bonding between the two is made stronger.

Next, FIG. 5 shows an embodiment in which the tip of the cylindrical hole edge of the element 2 is bent inward in the opposite direction to that shown in FIG. 4. Furthermore, FIG. 6 shows an embodiment in which the hole edge of the element 2 is raised into a cylindrical shape and the tip thereof is bent in an oblique direction. Further, FIG. 7 shows an embodiment in which the hole edge of the element 2 is formed so that the cross section becomes one of the saw blades.

Next, FIG. 8 shows the hole edge of the outermost element 2 extending from the hole of the side member 4 toward its center, and the flat lower surface of the boss portion 5 is the extending portion of the element 2. This is an embodiment in which the boss is joined by brazing to a joint surface 7 for a boss, and FIG. 9 shows an embodiment in which the lower surface of the boss is formed completely flat.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and the shape of each element can be made into an appropriate shape. Further, fins may be interposed on the inner surface, outer surface, or both surfaces of each element.

[Effect of idea]

The boss attachment structure of the present invention has the above configuration and has the following effects.

(1) According to this structure, without cladding the outer surface of the side member 4 with brazing material in advance, the brazing cladding layer of each element is used to connect between each element and between the side member 4 and the boss portion 5. They can be integrally brazed and fixed to each other. Therefore, it is possible to provide a good-looking heat exchanger with no traces of wax flow on the outer surface of the side member 4, and to minimize the number of assembly and component parts. The device can be provided at low cost.

(2) Furthermore, in this structure, the element of the heat exchanger and the boss portion 5 are directly joined, resulting in a brazed structure that is unlikely to cause fluid leakage.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a main part of a first embodiment of the boss mounting structure of the present invention, Fig. 2 is a longitudinal cross-sectional view of a main part of a second embodiment of the present invention, and Fig. 3 is a longitudinal cross-sectional view of a main part of a second embodiment of the boss mounting structure of the present invention. FIGS. 4 to 9 are longitudinal sectional views showing essential parts of third to eighth embodiments of the present invention. 1... Communication hole, 2... Element, 3... Hole,
4... Side member, 5... Boss portion, 6... Brazing material, 7... Joint surface for boss, 8... Convex part for fitting,
9... Wave-shaped protrusions.

Claims (1)

[Scope of utility model registration request] A plurality of elongated planar elements 2 each having a communication hole 1 perforated in the thickness direction at the end thereof are stacked, and
A side member 4 having a hole 3 formed at an end thereof aligned with the communication hole 1 is superimposed on the outermost element 2 in the stacking direction, and a boss portion 5 is located at the edge of the communication hole 1. In the boss mounting structure of a laminated heat exchanger in which each of these members is integrally brazed, the element 2 is composed of a pair of opposing press-formed metal plates with brazing filler metal 6 clad on both sides. and the hole edge of the communication hole 1 of the outermost element is raised outward within the hole 3 of the side member 4 or extends in the radial direction within the hole 3 of the side member 4. a metal plate which forms a joint surface 7 for a boss, the element side of the boss portion 5 is joined to the joint surface 7, and further, at least the outer surface of the side member 4 in the lamination direction is not clad with a brazing material. A boss mounting structure for a laminated heat exchanger characterized by using.