Heat exchange – Tubular structure – With support or flow connector
Reexamination Certificate
1999-05-06
2001-08-21
Lazarus, Ira S. (Department: 3743)
Heat exchange
Tubular structure
With support or flow connector
C165S133000, C029S890054
Reexamination Certificate
active
06276447
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application is related to and claims priority from Japanese Patent Application No. Hei. 10-129172 filed on May 12, 1998, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus which is formed by brazing plural metal members, and a brazing method for manufacturing the apparatus. The present invention is suitable for a case where a brazing material can be clad or applied on only one surface of a metal member, or a case where a brazing material can be clad or applied on both surfaces of the metal member while a core plate of the metal member is made thicker by thinning the brazing material on one surface of the metal member.
2. Description of Related Art
As a method for brazing two metal members, contacting surfaces of the two metal members are generally clad or applied with a brazing material. However, in a case where only one surface of the metal member can be clad or applied with the brazing material from characteristics of a product, the method may be difficult to form the product by brazing plural metal members.
For example, as shown in
FIGS. 3A-3C
, a brazing material R is clad on an inner surface
11
b
of a plate
11
, and the inner surface
11
b
of the plate
11
is brazed to an another plate (not shown) using the brazing material R so that a tube
10
is formed. When a connection block
12
for connecting a pipe (not shown) to the tube
10
is brazed to the plate
11
, a brazing material is clad on a contacting surface of the block
12
, contacting the plate
11
, or is clad on a contacting surface
11
a
of the plate
11
. Because the connection block
12
is necessary to form a female screw portion
12
a
through a mechanical step (i.e., screw forming step), it is impossible to cold the brazing material on the contacting surface of the block
12
. Therefore, a sheet-like brazing material is clad on the contacting surface
11
a
of the plate
11
as shown in
FIG. 3A
, a ring like brazing material is provided at a corner between the connection block
12
and the plate
11
as shown in
FIG. 3B
, or a paste like brazing material is applied on the corner between the connection block
12
and the plate
11
as shown in FIG.
3
C.
Thus, in addition to the brazing material for forming the tube
10
, an another brazing material for brazing the connection block
12
to the plate
11
is also necessary. Therefore, brazing steps are increased, and an apparatus formed by brazing plural metal members, such as a heat exchanger, is produced in high cost.
SUMMARY OF THE INVENTION
In view of the foregoing problems, it is an object of the present invention to provide an apparatus which is produced by brazing plural metal members in low cost.
According to the present invention, an apparatus includes a first metal member and a second metal member being bonded to the first metal member on a first surface of the first metal member. In the first metal member of the apparatus, there is formed a hole penetrating through the first metal member from the first surface to a second surface of the first metal member, opposite to the first surface. A brazing material is clad on the second surface of the first metal member at least at a position around the hole. Thus, during a brazing, a part of the brazing material is supplied to the first surface between the first metal member and the second metal member through the hole. As a result, the first and second metal members are readily brazed and bonded to each other, so that the apparatus can be readily produced in low cost.
REFERENCES:
patent: 4272006 (1981-06-01), Kao
patent: 5203407 (1993-04-01), Negasaka
patent: 5228727 (1993-07-01), Tokutake et al.
patent: 5555929 (1996-09-01), Ishikawa
patent: 5632161 (1997-05-01), Shimoya et al.
patent: 5758904 (1998-06-01), Ross et al.
patent: 5761808 (1998-06-01), Patel et al.
patent: 4318058 (1994-12-01), None
patent: WO 93/15369 (1993-08-01), None
Hirakami Kouji
Iguchi Takeshi
Kotate Homare
Uchikawa Akira
Denso Corporation
Duong Tho
Harness Dickey & Pierce PLC
Lazarus Ira S.
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