JP6325964B2 - Flange joint structure of heat exchanger - Google Patents

Description

  The present invention relates to a casing in which a casing is fitted on an outer periphery of a core, an opening is provided at an end of the casing, and a flange is joined to the opening. More specifically, the opening of the casing is subjected to burring, and the burring The present invention relates to an apparatus for brazing and fixing a flange to a hole edge of a processed part in a liquid-tight manner.

A heat exchanger in which a large number of flat tubes are stacked to form a core and a casing is fitted on the outer periphery of the core is known as Patent Document 1 below.
The casing described in Patent Document 1 is formed in a cylindrical shape by combining a main body and a lid member, and flanges are fixed to both ends thereof via a cylindrical short stepped header member. A gas guiding duct (not shown) is connected through this flange.
Instead of such a casing, it is also conceivable to place a box-shaped casing on the outer periphery of the core, provide openings at both ends in the longitudinal direction, and attach flanges to the openings.

JP 2008-275244 A

The flange mounting structure described in Patent Document 1 requires a short cylindrical header member between the casing and the flange, which increases the number of parts and makes the assembly troublesome.
Further, when the casing is formed in a box shape and subjected to burring at both ends in the longitudinal direction and the opening of the flange is brazed to the burring portion, the root R of the base of the burring portion and the base of the opening of the flange Will interfere with the part. Then, there is a possibility that a gap is generated between the flange and the casing and positioning between the two cannot be performed. In order to avoid this, it is necessary to cut the inner periphery of the opening edge of the flange so as not to interfere with the R portion of the burring. In that case, there is a drawback that the manufacture of the flange is troublesome and the cost is increased.

This will be explained using the drawing of the present invention in FIG. 4. The connection opening 7 of the flange 8 is fitted around the outer periphery of the burring opening 5 of the casing body 3, and the space between the burring opening 5 and the connection opening 7 is soldered. In the case of attaching, if the seat portion 10 of the present invention which will be described later does not exist in the figure, the plane of the flange 8 moves from the position of the solid line to the position of the chain line, and the edge thereof contacts the R portion and the flange 8 and the casing. There arises a problem that a gap 12 is formed between the main body 3 and the main body 3.
Therefore, an object of the present invention is to provide a connection structure between a flange and a casing that has a small number of parts and does not require special processing.

The invention described in claim 1 includes a core (2) made of a laminate of flat tubes (1),
A box-shaped casing body (3) that houses the core (2) and is open on one side, and a lid member (4) that closes the open side of the casing body (3). A casing (6) having a burring opening (5) burring on the outer surface side at the end of the side wall portion of
In a flange joint structure of a heat exchanger, having a connection opening (7) aligned with the outer periphery of the burring opening (5), and a flange (8) joined to the outer surface of the casing (6),
The casing body (3) has a section R (curvature radius R) at the root of the burring opening (5),
The lid member (4) is thicker than the radius of curvature of the R portion, and has a shallow rising peripheral wall portion (9) aligned with the outer periphery of the open portion of the casing body (6), and is formed in a dish shape. And a seat portion (10) covering at least a flat L-shaped peripheral portion of the burring opening (5) of the casing body (3) is formed integrally with the lid member (4),
The flange (8) is superimposed on the casing body (3) via the seat (10), and the inner periphery of the connection opening (7) is joined to the outer periphery of the burring opening (5) without any gap. It is the flange connection structure of the heat exchanger characterized by the above-mentioned.

The invention according to claim 2 comprises a core (2) comprising a laminate of flat tubes (1),
A box-shaped casing body (3) that houses the core (2) and is open on one side, and a lid member (4) that closes the open side of the casing body (3). A casing (6) having a burring opening (5) burring on the outer surface side at the end of the side wall portion of
In a flange joint structure of a heat exchanger, having a connection opening (7) aligned with the outer periphery of the burring opening (5), and a flange (8) joined to the outer surface of the casing (6),
The casing body (3) has a section R (curvature radius R) at the root of the burring opening (5),
The lid member (4) is thicker than the radius of curvature of the R portion, and has a shallow rising peripheral wall portion (9) aligned with the outer periphery of the open portion of the casing body (6), and is formed in a dish shape. And a seat (10) that covers at least the peripheral edge of the burring opening (5) of the casing body (3) in a plane U shape is formed integrally with the lid member (4),
The flange (8) is superimposed on the casing body (3) via the seat (10), and the inner periphery of the connection opening (7) is brazed to the outer periphery of the burring opening (5) without any gap. It is the flange connection structure of the heat exchanger characterized by having joined.

The invention according to claim 3 is the flange connection structure of the heat exchanger according to claim 1 or 2,
The seat (10) is a flange connection structure of a heat exchanger in which a side wall (13) that covers a side of the casing body (3) is integrally formed.

Invention of Claim 4 is a flange connection structure of the heat exchanger of Claims 1-3,
Each flat tube (1) constituting the core (2) is composed of a combination of a pair of groove plates (1a) (1b) having widened portions (1c) in the thickness direction at both ends thereof,
The flange connection structure of the heat exchanger has the burring opening (5) formed at both ends of the casing body (3), and the flange (8) is brazed to each burring opening (5).

The flange connection structure according to the first aspect of the present invention has an R portion at the base portion of the burring opening 5 of the casing body 3 and is provided through a seat portion 10 of a lid member having a thickness larger than the curvature radius thereof. The flange 8 is overlapped with the casing body 3 and the inner periphery of the connection opening 7 is joined to the outer periphery of the burring opening 5 without a gap.
Therefore, the connection opening 7 of the flange 8 and the R portion of the burring of the casing body 3 can be brazed and joined to the burring opening 5 without interference by the intervention of the seat portion 10. The brazing strength between the flanges can be improved. Moreover, since the seat portion 10 is formed in a planar L shape around the burring opening 5, there is an effect that the flange 8 can be positioned stably. Further, since the seat portion 10 is integral with the lid member 4, the number of parts is not increased, and assembly is facilitated.

  In the flange connection structure according to the second aspect of the invention, since the seat portion 10 is formed in a plane U shape around the burring opening 5 instead of the flat L-shaped seat portion, the flange 8 is more There is an effect that positioning can be performed stably.

According to the third aspect of the present invention, the side wall portion 13 that covers the side portion of the casing body 3 of the seat portion 10 is integrally formed. Therefore, positioning when the lid member 4 is fitted to the casing body 3 can be facilitated, and the strength of the seat portion 10 can be improved.
According to a fourth aspect of the present invention, the flat tube 1 of the core 2 is a combination of a pair of groove plates 1a and 1b, and flanges 8 are brazed and joined to both ends of the casing body 3. Therefore, both flanges 8 have the effect of being able to position stably.

The disassembled perspective view of the flange connection structure of the heat exchanger of this invention. FIG. III-III arrow line view of FIG. The IV section enlarged view of FIG. Explanatory drawing of the flange connection structure of 2nd Example of this invention. FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention.
As shown in FIG. 1, the flange connection structure of this heat exchanger has a core 2 made of a laminated body of a large number of flat tubes 1 and a casing 6 in which the core 2 is fitted (consisting of a casing body 3 and a lid member 4). And a pair of flanges 8 disposed at both ends of the casing 6.

  Each flat tube 1 which comprises the core 2 consists of a fitting body of a pair of grooved plate 1a, 1b formed in groove shape. Each of the groove plates 1a and 1b is formed in a groove shape, and has both bulging portions 1c that bulge in the thickness direction. And it laminates | stacks so that each flat tube 1 may contact | connect in the position of this bulging part 1c, and the core 2 is formed.

  Next, the casing 6 includes a casing body 3 and a lid member 4, and the casing body 3 is formed in a box shape. The upper end is opened in FIG. 1, and the lid member 4 is fitted therein. Further, a pair of burring openings 5 are formed at both ends of the casing body 3. As shown in FIGS. 3 and 4, the burring opening 5 protrudes toward the outside of the casing body 3, and its root portion is formed in an R shape. The casing body 3 is provided with a pair of cooling water inlet / outlet pipes 14 protruding therefrom.

The cover member 4 is provided with a peripheral wall portion 9 on the outer periphery thereof, and the inner periphery of the peripheral wall portion 9 is aligned with the outer periphery on the open end side of the casing body 3. Further, the lid member 4 is formed with seats 10 at both ends in the longitudinal direction. The seat 10 is fitted around the outer periphery of the burring opening 5 in a plane L shape.
Further, a side wall portion 13 is formed in an L-shaped cross section adjacent to the seat portion 10. The seat portion 10 and the side wall portion 13 extend integrally with the peripheral wall portion 9 of the lid member 4 and are integrally formed.
The side wall portion 13 may not be formed.

The flange 8 attached to each burring opening 5 has a connection opening 7 aligned with the outer periphery of the burring opening 5. Then, the flange 8 is seated on the seat portion 10 of the lid member 4 in a state in which the lid member 4 is fitted to the casing body 3, and the parts are integrally brazed and fixed.
At this time, as shown in FIG. 4, the flange 8 is seated via the seat portion 10 of the lid member 4. The plate thickness of the seat portion 10 is thicker than the radius of curvature R of the R portion of the burring opening 5. Therefore, when the connection opening 7 of the flange 8 is fitted on the outer periphery of the burring opening 5, the end surface of the flange 8 does not contact the R portion due to the presence of the seat portion 10, and is stably seated on the plane of the seat portion 10. Is done. Moreover, since the area which contacts a flange surface becomes large by the seat part 10, brazing becomes firm.

  If the seat portion 10 does not exist, the flange 8 moves from the position of the solid line to the position of the chain line, and a gap 12 is formed there. That is, when only the peripheral wall portion 9 exists on the outer periphery of the lid member 4 and the seat portion 10 does not exist, the flange 8 is on the bottom surface side of the casing body 3, and the connection opening 7 of the flange 8 contacts the R portion of the burring opening 5. In this case, the burring opening 5 is inclined and is not stable. More specifically, when only the peripheral wall portion 9 exists on the outer periphery of the lid member 4, the upper edge of the flange 8 is in contact with the peripheral wall portion 9 and the lower edge is in contact with the R portion of the burring opening 5. For this reason, the casing 8 is inconveniently attached with an inclination. In order to prevent this, the seat portion 10 is provided integrally with the lid member 4.

  In the heat exchanger thus formed, the parts are integrally brazed and fixed, and the connection opening 7 of the flange 8 and the outer periphery of the burring opening 5 are brazed in a liquid-tight manner. A duct (not shown) is connected to the flange 8, and gas is guided from the burring opening 5 to each flat tube 1. Further, on the outer periphery of the flat tube 1, cooling water flows from the casing pipe 14 to the outer periphery of the flat tube 1, and heat exchange is performed between the cooling water and the gas.

Next, FIGS. 5 and 6 show a second embodiment of the present invention.
The main difference of the present invention from the first embodiment is that the burring opening 5 of the casing body 3 is in the center of the end, and the shape of the seat portion 10 of the lid member 4 is formed in a plane U shape. It is.

1 Flat tube
1a Groove plate
1b Grooved plate
1c Expanding part 2 Core 3 Casing body 4 Lid member 5 Burring opening 6 Casing

7 Connection opening 8 Flange 9 Perimeter wall
10 Seat
11 Brazing part
12 Clearance
13 Side wall
14 Pipe

Claims (4)

A core (2) made of a laminate of flat tubes (1);
A box-shaped casing body (3) that houses the core (2) and is open on one side, and a lid member (4) that closes the open side of the casing body (3). A casing (6) having a burring opening (5) burring on the outer surface side at the end of the side wall portion of
In a flange joint structure of a heat exchanger, having a connection opening (7) aligned with the outer periphery of the burring opening (5), and a flange (8) joined to the outer surface of the casing (6),
The casing body (3) has a section R (curvature radius R) at the root of the burring opening (5),
The lid member (4) is thicker than the radius of curvature of the R portion, and has a shallow rising peripheral wall portion (9) aligned with the outer periphery of the open portion of the casing body (6), and is formed in a dish shape. And a seat portion (10) covering at least a flat L-shaped peripheral portion of the burring opening (5) of the casing body (3) is formed integrally with the lid member (4),
The flange (8) is superimposed on the casing body (3) via the seat (10), and the inner periphery of the connection opening (7) is joined to the outer periphery of the burring opening (5) without any gap. A flange connection structure of a heat exchanger characterized by the above. A core (2) made of a laminate of flat tubes (1);
A box-shaped casing body (3) that houses the core (2) and is open on one side, and a lid member (4) that closes the open side of the casing body (3). A casing (6) having a burring opening (5) burring on the outer surface side at the end of the side wall portion of
In a flange joint structure of a heat exchanger, having a connection opening (7) aligned with the outer periphery of the burring opening (5), and a flange (8) joined to the outer surface of the casing (6),
The casing body (3) has a section R (curvature radius R) at the root of the burring opening (5),
The lid member (4) is thicker than the radius of curvature of the R portion, and has a shallow rising peripheral wall portion (9) aligned with the outer periphery of the open portion of the casing body (6), and is formed in a dish shape. And a seat (10) that covers at least the peripheral edge of the burring opening (5) of the casing body (3) in a plane U shape is formed integrally with the lid member (4),
The flange (8) is superimposed on the casing body (3) via the seat (10), and the inner periphery of the connection opening (7) is brazed to the outer periphery of the burring opening (5) without any gap. A flange connection structure of a heat exchanger characterized by being joined. In the flange connection structure of the heat exchanger according to claim 1 or 2,
The seat portion (10) is a flange connection structure of a heat exchanger in which a side wall portion (13) that covers a side portion of the casing body (3) is integrally formed. In the flange connection structure of the heat exchanger according to claims 1 to 3,
Each flat tube (1) constituting the core (2) is composed of a combination of a pair of groove plates (1a) (1b) having widened portions (1c) in the thickness direction at both ends thereof,
A flange connection structure of a heat exchanger in which the burring opening (5) is formed at both ends of the casing body (3), and the flange (8) is brazed to each burring opening (5).

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