JP2900136B2 - Heat exchanger manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat exchanger used for, for example, an oil cooler, an aftercooler, an intercooler, a radiator, and the like.

[0002] In this specification, the term "aluminum" includes an aluminum alloy in addition to pure aluminum.

[0003]

2. Description of the Related Art In recent years, a so-called plate-fin type heat exchanger has been widely used as a heat exchanger such as an oil cooler. In this heat exchanger, a first fluid flow path through which external air flows and a second fluid flow path through which oil or the like flows orthogonally to the first fluid flow path are alternately formed via a flat plate. .

With regard to this type of heat exchanger, the applicant has
First, the first fluid flow path is formed by a flat plate which is disposed on both the left and right sides and has interval holding protrusions at both upper and lower ends, and fins interposed between the upper and lower interval holding protrusions, The second fluid flow path is formed by a flat plate disposed on both the left and right sides, and a second fluid flow path forming body interposed between the two flat plates and having an outer periphery having substantially the same shape and size as the flat plate,
A heat exchanger has been proposed in which these heat exchanger components are superimposed and brazed together in the order of a flat plate, a fin, a flat plate, and a second fluid flow path forming body (Japanese Utility Model Application Laid-Open No. 63-116).
No. 781).

Here, the second fluid flow path forming body is made of an extruded aluminum material composed of square rod-shaped front and rear side walls and vertical connecting walls for connecting these, and the upper and lower ends of the vertical connecting wall are formed at both ends. It is formed by removing, removing the upper and lower ends and the lower end of the front and rear side walls, respectively, inwardly, butting these end surfaces together, and joining them with argon welding.

[0006]

However, joining the end faces of the upper end and the lower end bent inside the front and rear side walls of the second fluid flow path forming body by argon welding each time is extremely troublesome. It is not practical because the cost is high and the manufacturing cost is high.

Further, it is not always easy to bend the upper and lower ends of the front and rear side walls of the second fluid flow path forming body inward and to make these end faces come into close contact with each other so as to completely match each other. The end faces may be separated or shifted from each other, and it is considered that the same may occur due to the variation in dimensional accuracy. Therefore, the bonding property cannot be said to be sufficient. In addition, it is extremely time-consuming to carefully check and correct whether such gaps or deviations have occurred before overlapping with other heat exchanger components such as a flat plate, and it is extremely time-consuming. There is a possibility that it may be a hindrance factor.

An object of the present invention is to solve the above problems.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a first fluid flow path and a second fluid flow path separated by a flat plate made of aluminum brazing sheet.
The first fluid flow path is provided alternately with the fluid flow paths, the flat plate disposed on the left and right sides, a pair of spacers disposed on both the upper and lower sides between the flat plates, and the first fluid flow path is interposed between the spacers. And the second fluid flow path is formed by
A heat exchanger formed by a flat plate disposed on both left and right sides and a second fluid flow path forming body interposed between the two flat plates and having an outer periphery substantially the same shape and size as the flat plate, a flat plate, a spacer and In a method of manufacturing by superposing these heat exchanger constituent members in the order of the fin, the flat plate, and the second fluid flow path forming body and brazing them all together, The upper and lower ends of the vertical connecting wall are removed by using an extruded aluminum material composed of both side walls and a vertical connecting wall connecting these, and the upper and lower ends of the front and rear side walls are heat-exchanged by the above-mentioned flat plate or the like. Cutting in such a manner as to form inclined surfaces having the same gradient in opposite directions to each other at the upper end portions and the lower end portions of the front and rear side walls in a direction intersecting with the overlapping direction of the container constituent members,
By bending the upper end and lower end of the front and rear side walls inwardly, butting these inclined surfaces against each other, and performing batch brazing after overlapping the heat exchanger components such as the flat plate. And joining the inclined surfaces of the upper and lower end portions of the front and rear side walls of the second fluid flow path forming body to each other with the brazing material eluted from the flat plate.

[0010] According to the above method, the second fluid flow path forming body is made of an extruded aluminum material having square rod-shaped front and rear side walls and vertical connecting walls connecting them, and the upper and lower portions of the vertical connecting wall are formed. Both ends are removed, and the upper and lower ends of the front and rear side walls are opposed to each other at the upper end and the lower end of the front and rear side walls in a direction intersecting the overlapping direction of the heat exchanger components such as the flat plate. Since the inclined surfaces having the same inclination in the direction are cut and the upper end and the lower end of the front and rear side walls are respectively bent inward, these inclined surfaces abut each other. If there is a slight gap between them, or if they are slightly shifted in the front-rear direction so that the front and rear side walls are close to each other, However, when the heat exchanger components such as flat plates are overlapped, the inclined end faces are pressed against each other, so that these gaps and gaps are eliminated, and the joining is performed in a state where they are in close contact so that they are almost completely matched. Done. In addition, the bonding area increases as compared with the conventional method, thereby increasing the bonding strength.

In addition, when the heat exchanger components such as flat plates are brazed together after overlapping, the brazing material eluted from the flat plate is used to form the upper and lower end portions of the front and rear side walls of the second fluid flow path forming body. Since the inclined surfaces are joined to each other, there is no need to perform another process such as argon welding as in the conventional method.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings.

In this specification, “front and rear” and “left and right” are based on FIG. 1, “front” means the front side of the drawing sheet of FIG. 1, “rear” means the same back side, and “left and right”. Means left and right in FIG.

FIGS. 1 to 3 show an aluminum heat exchanger (1) manufactured by the method of the present invention.
1 to 3, a heat exchanger (1) is provided for a first fluid flow path (A) through which external air flows and an oil to be exchanged with external air for a first fluid flow path (A). A second fluid flow path (B1) flowing in a direction orthogonal to the first fluid flow path, and compressed air discharged from the compressor and exchanged with external air for heat exchange with the first fluid flow path.
(A) and a second fluid flow path (B2) that flows in a direction orthogonal to that of (A).

That is, this heat exchanger (1) has
And an oil cooler portion in which 12 first fluid flow paths for external air (A) and 12 second fluid flow paths for oil (B1) are alternately and orthogonally arranged with each other. Through the common first air flow path for external air (A), on the right, six second air flow paths for compressed air (B2) and six first air flow paths for external air
The fluid flow path (A) has an aftercooler portion alternately and orthogonally arranged.

First fluid flow path for external air of heat exchanger (1)
2A and 2B, both left and right flat plates (3) made of double-sided aluminum brazing sheet having fluid passage holes (4) at both upper and lower ends, as shown in FIGS. Fluid passage holes of both flat plates (3)
It is formed by a pair of spacers (8) each having a fluid passage hole (9) communicating with (4), and corrugated fins (10) with louvers arranged between the spacers (8). The front and rear ends of the first external air flow path (A) are open, and the external air is circulated through the first flow path (A) by forced air blowing by a fan or natural ventilation by running a vehicle or the like.

The second fluid flow path (B1) for oil is provided between left and right flat plates (3) made of aluminum brazing sheet having fluid passage holes (4) at both upper and lower ends, and between the flat plates (3). And a vertical connecting wall which connects the annular outer wall (6) along the periphery of both flat plates (3) and the front and rear side walls (12, 13)
And (7) a second fluid flow path forming body (5). The upper and lower ends of the second fluid flow path forming body (5) are provided with communication holes (14). The vertical connecting wall (7) is provided with a number of arch-shaped projections (15) projecting left and right, and a fluid passage hole (16) is formed so as to face all the arch-shaped projections (15). .

The second fluid flow path for compressed air (B2) is formed of both left and right flat plates (3) and a second fluid flow path forming body (5), similarly to the second fluid flow path for oil (B1). ing. However, the vertical connecting wall (7) of the second fluid flow path forming body (5) has an arch-shaped projection (15).
In place of the fluid passage hole (16), a cylindrical portion (17) having a substantially rhombic cross section and extending vertically is integrally provided (see FIGS. 2 and 3).

The oil cooler portion and the after cooler portion of the heat exchanger (1) have fluid passage holes (4) at both upper and lower ends of each flat plate (3) and fluid passage holes (9) of both upper and lower spacers (8). )
The upper and lower header portions (2) are respectively formed by the upper and lower communication holes (14) of the second fluid flow path forming body (5) (see FIG. 1). In the first air flow path for external air (A) located between the oil cooler portion and the after cooler portion, block-shaped upper and lower spacers (8a) having no fluid passage holes are arranged, and these spacers (8a ) Separates the header portion (2) between the oil cooler portion and the after cooler portion.

At the upper and lower ends of the left side plate (20) of the heat exchanger (1), a pipe joint (21) for oil introduction and a pipe joint (21) for oil discharge leading to both upper and lower headers (2) of the oil cooler part. 22) are connected to each other, and the upper and lower ends of the right side plate (20) are provided with a compressed air introduction pipe joint (23) and a compressed air discharge pipe joint (24) which communicate with the upper and lower header sections (2) of the aftercooler section. 24) are connected respectively.

Next, a method of manufacturing the heat exchanger (1) will be described.

The flat plate (3) excluding the second fluid flow path forming body (5),
The heat exchanger components such as the spacers (8) and (8a) and the corrugated fins (10) are manufactured by a usual method.

The second fluid flow path forming body (5) is made of an extruded aluminum material having square rod-shaped front and rear side walls (12) and (13) and a vertical connecting wall (7) connecting these, as a material. First,
The upper and lower ends of the vertical connecting wall (7) are removed (FIG. 4).
reference). The vertical connection wall (7) is formed on the arched projection (15) and the fluid passage hole (1) by pressing or forming rolls.
6) is formed, or the tubular portion (17) is formed by integral molding.

Next, the upper and lower ends (1) of the front and rear side walls (12, 13)
2a) (13a) (12b) (13b) in the direction intersecting the direction of superposition of the heat exchanger components such as the flat plate (3) and the upper end (12a ) (13a) and lower end (12b)
(13b) are cut so as to form inclined surfaces (18) and (19) which are opposite to each other and have the same gradient (see FIG. 5). That is, the upper right end (12a) of the front side wall (12) has an obliquely upwardly inclined surface (18), and the upper end (13a) of the rear side wall (13) has an obliquely upwardly inclined left surface (19). Each lower end (12b) of (12) is formed with a diagonally downwardly inclined surface (18), and the lower end (13b) of the rear wall (13) is formed with a diagonally downwardly inclined surface (19). The ends (12a), (13a), (12b), and (13b) are cut. The inclination of the inclined surfaces (18) and (19) is about 30 with respect to the length direction of the front and rear side walls (12) and (13).
A range of ６０60 ° is appropriate.

The upper and lower ends (12, 13) of the front and rear side walls (12, 13)
a) (13a) and the lower ends (12b) and (13b) are bent inward at substantially right angles, respectively, and the inclined surfaces (18) and (19) of the upper ends (12a) and (13a) are bent.
And the inclined surfaces (18) and (19) of the lower ends (12b) and (13b) abut each other. Thereby, the second fluid flow path forming body
Communication holes (14) are formed at both upper and lower ends of (5) (see FIG. 6). At this time, the butted surfaces (18) and (19) are in close contact with each other so that they substantially match (FIG. 7 (a)).
7), there is a slight gap between the two (see FIG. 7 (b)), and the front and rear side walls (12) and (13) are slightly displaced in the front-rear direction so that they come closer to each other (FIG. 7 (b)). c)), and there is a slight gap between them, and both are slightly shifted in the front-rear direction so that the front and rear side walls (12) and (13) are close to each other (see FIG. 7 (d)). In any case, as described later, good bonding is performed.

Next, the plate (3), the spacers (8) and (8a) and the corrugated fin (10), the plate (3), and the second fluid flow path forming body (5) are arranged in this order. The members are overlapped (see FIG. 8). This allows the fluid passage holes in each plate (3)
Upper and lower header portions (2) are formed, which are composed of (4), a fluid passage hole (9) of the spacer (8), and a communication gap (14) of the second fluid flow path forming body (5). (See FIG. 1).

Then, the heat exchanger components such as the flat plate (3) and the like superposed as described above are collectively brazed by, for example, a vacuum brazing method while being tightened in the superposing direction by a jig (FIG. 8). reference).

Here, the inclined surfaces (18) and (19) of the upper ends (12a) and (13a) of the front and rear side walls (12) and (13) of the second fluid flow path forming body (5) and the lower end (12b The inclined surfaces (18) and (19) of (13) are joined to each other by the brazing material eluted from the flat plate (3) during the above-mentioned brazing.

Further, as shown in FIGS. 7 (b) to 7 (d), the inclined surfaces (18) and (19) facing each other have a slight gap between them, or the front and rear side walls (12 (13) Even if they are slightly shifted in the front-rear direction so that they approach each other,
Heat exchanger components such as the flat plate (3) are tightened in the stacking direction by a jig, and the inclined surfaces (18) and (19) are pressed together, so that these gaps and deviations are eliminated. Are joined in close contact with each other so as to almost completely match. Therefore, only the jig for fastening the heat exchanger components such as the flat plate (3) in the overlapping direction may be used for the brazing at a time, and there is an advantage that the cost of the jig can be reduced.

Finally, an oil introduction pipe joint (21) and an oil discharge pipe joint (22) are provided at the upper and lower ends of the left side plate (20).
At the upper and lower ends of the right side plate (20), pipe joints for compressed air introduction (23)
And compressed air exhaust pipe fitting (24)
(2) Connect by a normal method so as to connect to (2) (see FIG. 1). Thus, the heat exchanger (1) shown in FIG. 1 is obtained.

Although the above-mentioned heat exchanger (1) has an oil cooler and an aftercooler integrated with each other, the heat exchanger (1) is also applicable to a case where a heat exchanger composed of an independent oil cooler or aftercooler is manufactured. Of course, the present invention can be applied.

[0032]

According to the heat exchanger manufacturing method of the present invention, the second fluid flow path forming member is formed by extruding an aluminum extruded member comprising square rod-shaped front and rear side walls and vertical connecting walls connecting these walls. The upper and lower ends of the vertical connecting wall are removed, and the upper and lower ends of the front and rear side walls are oriented in a direction intersecting with the direction of superposition of the heat exchanger components such as the flat plate and the upper ends of the front and rear side walls. The lower and upper portions are cut in such a way that inclined surfaces having the same gradient are formed in opposite directions, and the upper and lower end portions of the front and rear side walls are respectively bent inward, whereby these inclined surfaces are mutually connected. Since the butted surfaces are closely contacted so that they match each other, a slight gap is created between them, and the front and rear side walls are brought close to each other. Even if you are slightly displaced in the direction,
When the heat exchanger components such as flat plates are overlapped, the inclined surfaces are pressed against each other to eliminate these gaps and misalignment, and the joining is performed in a close contact state so that both are almost completely matched. . In addition, the bonding area increases as compared with the conventional method, thereby increasing the bonding strength. Accordingly, the joining property between the upper end and the lower end of the front and rear side walls is improved, and an excellent product in which fluid leakage or the like hardly occurs can be obtained. In addition, it is not necessary to carefully check the butted state of the inclined surfaces in the second fluid flow path forming member before overlapping with another heat exchanger component such as a flat plate, so that the workability is improved.

Further, during the collective brazing after the heat exchanger constituent members such as flat plates are overlapped, the brazing material eluted from the flat plates is used to form the upper and lower end portions of the front and rear side walls of the second fluid flow path forming body. Since the inclined surfaces are joined to each other, it is not necessary to perform another process such as argon welding as in the conventional method, and the manufacture of the heat exchanger becomes easier and the manufacturing cost is reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a heat exchanger manufactured by the method of the present invention.

FIG. 2 is an enlarged perspective view of a main part of a partially cut-away portion showing a flow path configuration of an oil cooler portion and an after cooler portion of the heat exchanger.

FIG. 3 is an exploded perspective view of components of an oil cooler portion and an after cooler portion of the heat exchanger.

FIG. 4 is an enlarged perspective view of a main part of a second fluid flow path forming body showing one step of a method of manufacturing a heat exchanger.

FIG. 5 is an enlarged perspective view of a main part of a second fluid flow path forming body showing one step of a method of manufacturing a heat exchanger.

FIG. 6 is an enlarged perspective view of a main part of a second fluid flow path forming body, showing one step of a method of manufacturing the heat exchanger.

7 is an enlarged plan view of a main part showing a state in which inclined surfaces of upper and lower ends of both front and rear side walls of a second fluid flow path forming body in the process of FIG.

FIG. 8 is an enlarged perspective view of a main part in a state where heat exchanger constituent members such as flat plates are overlapped, showing one step of a method of manufacturing the heat exchanger.

[Explanation of symbols]

A first fluid flow path for external air B1 second fluid flow path for oil B2 second fluid flow path for compressed air 1 heat exchanger 3 flat plate made of aluminum brazing sheet 5 second fluid flow path forming body 7 vertical connecting wall Reference Signs List 8 spacer 10 corrugated fin 12 front wall 12a upper end 12b lower end 13 rear wall 13a upper end 13b lower end 18 inclined surface 19 inclined surface

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Guo Di ▲ Flip ▼ Showa Aluminum Co., Ltd., 6,224, Kaiyama-cho, Sakai City (72) Inventor Mitsuru Mitsue 6,224, Kaiyama-cho, Sakai City Showa Aluminum Co., Ltd. In-house (56) References JP-A-63-116781 (JP, U) JP-A-2-48268 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21D 53/02- 53/08 B23K 1/00 330 F28D 1/00-9/02 F28F 3/00-3/14

Claims (1)

(57) [Claims] A first fluid flow path (A) and a second fluid flow path (B1) (B2) alternately separated by a flat plate (3) made of aluminum brazing sheet are provided alternately. Road (A)
A flat plate (3) arranged on both left and right sides, and a pair of spacers (8) arranged on both upper and lower sides between the two flat plates (3),
The second fluid flow paths (B1) and (B2) are formed by the fins (10) interposed between the spacers (8), and the second fluid flow paths (B1) and (B2) are arranged on both left and right sides. The heat exchanger (1) formed between the flat plate (3) and the second fluid flow path forming body (5) having substantially the same outer shape as the flat plate (3) is
(3), spacer (8) and fin (8), flat plate (3), second
In a method of manufacturing by superposing these heat exchanger components in the order of the fluid flow path forming body (5) and brazing them together, the second fluid flow path forming body (5) is formed by Using aluminum extruded profiles consisting of both side walls (12) (13) and vertical connecting walls (7) connecting them, the upper and lower ends of the vertical connecting walls (7) are removed.
(12) Place the upper and lower ends (12a), (13a), (12b), and (13b) of (13) in the direction intersecting the direction of superposition of the heat exchanger components such as the flat plate (3) and at the front and rear sides. Upper end (12a) of wall (12) (13)
(13a) cutting each other and lower end portions (12b) (13b) so as to form inclined surfaces (18) (19) having the same gradient in opposite directions, front and rear side walls (12) (13) Upper end (12
a) (13a) and the lower ends (12b) and (13b) are bent inward so that the inclined surfaces (18) and (19) abut each other, and heat exchange of the flat plate (3) and the like is performed. The second fluid flow path forming member is formed by brazing material eluted from the flat plate (3) during the brazing after the component members are overlapped.
(5) including joining the inclined surfaces (18) and (19) of the upper end (12a) (13a) and the lower end (12b) (13b) of the front and rear side walls (12) and (13) to each other. , Heat exchanger manufacturing method.