JPH06339767A - Structure of brazing part of metallic vessel - Google Patents

Abstract

PURPOSE:To prevent the deviation of a brazing filler metal at the time of brazing by providing the peripheral edge of the bottom plate of a blind cylindrical body with a stepped part having a difference in level downward and clamping and fixing the wire-shaped brazing filler metal by an annular groove formed between this stepped part and the inside surface of the body at the time of fitting and brazing the bottom end and bottom plate of the blind cylindrical body. CONSTITUTION:The circular wire-shaped brazing filler metal 5 is arranged at the bottom end 2 of the blind cylindrical body 1. The brazing filler metal 5 is clamped and fixed between the stepped part 6 of the bottom plate 3 and the bottom end 2 of the body 1. Then, there is no deviation of the brazing filler metal 5 at the time of brazing and the brazing is surely executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a brazing part structure of a metal container.

[0002]

2. Description of the Related Art Conventionally, a disc-shaped bottom plate is fitted into the lower open end of a cylindrical body with a lid, both are fixed by brazing, and sealed to form a metal container. For example, an outer shell structure including the housing 50 and the seat 40 of the heat exchanger disclosed in Japanese Utility Model Laid-Open No. 2-92482 is such. Such a metal container serves as a cooling water jacket by accommodating therein a heat exchange core having a fluid flow path such as oil. As shown in the main part of FIG. 4, in this metal container 30, a disc-shaped bottom plate 32 is fitted to the lower end of a cylindrical body 31 having a lid, and a line arranged in a circle along the inner surface of the lower end of the body 31. The brazing material 34 is used for brazing. The peripheral edge of the bottom plate 32 is convenient for inserting the flange 33 downward and inserting it into the lower end of the body 31 for fitting.

Further, as shown in FIG. 5, an annular groove 36 is formed in the peripheral edge of the bottom plate 35, a circular linear brazing material 34 is arranged in the groove 36, and an outer flange 37 of the groove 36 is placed outside the lower end portion of the body 31. May be fitted to. The body and bottom plate combined as shown in FIGS. 4 and 5 are heated in a brazing furnace together with necessary internal components such as a heat exchange core to melt and flow the brazing filler metal, and the joint between the body and the bottom plate is fixed by brazing. And seal it liquid-tight.

[0004]

In the conventional brazing structure as described above, the brazing material is unstable because it is only placed along the joint between the body and the bottom plate. Then, when the bottom plate is assembled to the body, the brazing filler metal does not fit into a fixed position and tilts or shifts. Further, the brazing filler metal may come off from a predetermined position due to shaking or inclination when it is transported after being assembled and inserted into the furnace. When brazing is performed in such a state, the molten brazing metal does not fully spread on the entire circumference along the peripheral edge of the bottom plate, resulting in defective brazing, which causes damage and leakage.

[0005]

A bottom plate provided with a disc-shaped stepped portion having a stepped downward portion on the periphery is fitted into the lower end portion of a metal body having a cylindrical shape with a lid, and the stepped portion and the lower end portion of the body are joined together. This is a structure in which a circular linear brazing material is arranged in an annular groove formed therebetween and the brazing material is sandwiched between the inner surface of the lower end portion of the body and the step portion.

[0006]

The brazing part of this structure is fixed to the body and the bottom plate even when it is shaken or slanted when the assembled container is transported or inserted into the furnace. ing. Therefore, when the brazing material is melted in the brazing furnace, the brazing material is not unevenly distributed and evenly spreads over the joint portion between the body and the bottom plate, and complete brazing can be performed.

[0007]

EXAMPLE FIG. 1 shows a main part of an example. A linear brazing filler metal 5 having a circular cross section in which a flange portion 4 at the periphery of a bottom plate 3 made of a disk-shaped metal plate is fitted into the inner surface of a lower end 2 of a body 1 made of a cylindrical metal plate with a lid and rounded into a circle. To place. The bottom plate 3 is provided with a step portion 6 inside the flange 4 at the outer peripheral end, and an annular groove 7 is formed between the step portion 6 and the inner surface of the lower end portion 2 of the body 1. The width of the annular groove 7 is substantially equal to the cross-sectional diameter of the linear brazing material 5, and the linear brazing material 5 is sandwiched between the inner surface of the body 1 and the step portion 6 in the annular groove 7.

In order to assemble the above structure, the wire brazing material 5 is wound around the stepped portion 6 and fitted into the inner surface of the body 1 from the lower open end. In this case, if the lower edge of the lower end portion 2 is widened as shown in FIG. In this way, the brazing furnace is inserted and brazed, but since the bottom plate 3 is fitted into the body 2 and the annular groove 7 is formed at the same time to sandwich the linear brazing material 5, the assembly, insertion into the furnace and brazing are performed. The brazing material does not shift during the process. Therefore, when the brazing material 5 is melted and flows in the annular groove 7, the brazing material 5 spreads evenly and no brazing failure occurs.

The structure shown in FIG. 2 is an example in which a lower end portion 12 of a body 11 made of a metal plate is provided with a taper portion 12a which opens downward. In this way, when the linear brazing material 5 is sandwiched by the annular groove 17 formed by the stepped portion 6 of the bottom plate 3 and the inner surface of the lower end portion 12 of the body 11, the annular groove 1 is formed by the inner surface of the tapered portion 12a.
Since the upper part of 7 is restricted, the wire brazing material 5 can be gripped more reliably.

The metal container whose main parts are shown in FIGS. 1 and 2 is, for example, a housing 2 of an oil cooler 20 for an internal combustion engine shown in FIG.
Used for 1. The housing 21 is made up of a cylindrical body 22 with a lid and a disc-shaped bottom plate 23.
It is brazed by a molten brazing material layer (not shown). 1 and 2 show a state before the brazing filler metal is melted in the vicinity of the joint 24.

The body 22 is provided with a central opening 25a, an oil outlet 25b, and a side surface with a cooling water inlet 26a, an outlet 26b in the center of the ceiling lid, and the bottom plate 23 is provided with a central opening 27a, an oil inlet 27b. A heat exchange core 29 formed by stacking annular plate-shaped plates 28 is housed inside. The heat exchange core 29 is one in which the layered spaces formed by the plate-shaped plates 28 alternately form oil and water flow paths to perform heat exchange.

The structure of the metal container according to the present invention can be applied not only to the housing 21 of the oil cooler 20 as shown in FIG. 3 but also to a container to be widely formed by brazing.

[0013]

According to the brazing part structure of the metal container of the present invention, since the brazing material is fixed and stable, there is no deviation of the brazing material during the assembly, transportation and brazing processes. Therefore, a brazing failure due to the displacement of the brazing material does not occur, and a metal container having high reliability against leakage and damage can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of an embodiment.

FIG. 2 is a cross-sectional view of a main part of another embodiment.

FIG. 3 is a sectional view of an oil cooler using the metal container of the present invention.

FIG. 4 is a structural example of a main part of a conventional metal container.

FIG. 5 is a structural example of a main part of another conventional metal container.

[Explanation of symbols]

 1, 11 Body 2, 12 Lower end 3 Bottom plate 5 Linear brazing material 6 Stepped portion 7, 17 Annular groove

Claims (1)

[Claims] 1. A brazing part of a metal container, in which a disc-shaped metal bottom plate is fitted to an open lower end of a metal body having a cylindrical shape with a lid, and a circular linear brazing material is arranged along the fitting part. In the structure, a step portion having a downward step is provided on the peripheral edge of the bottom plate to form an annular groove between the inner surface of the lower end portion of the body, and a linear brazing material is disposed in the annular groove to form the step portion and the lower end of the body. A brazing part structure of a metal container, which is sandwiched between the inner surface of the part and the inner surface of the part.