JPH0989477A - Manufacture of heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability and to restrain manufacturing cost, in a manufacture of a heat exchanger of the plate fin type, by easily forming a second fluid passage forming body. SOLUTION: A second fluid passage forming body 5 is constituted of an aluminum extruded shape material comprising front and rear side walls 12, 13 and a vertical connection wall 7, wherein upper and lower end portions of the wall 7 are removed. Upper ends 12a, 13a of both of the side walls are cut off in such a manner that the ends 12a, 13a are formed in directions intersecting superposing directions of flat heat exchanger constituent members and the ends 12a, 13a and lower ends are formed so as to have inclined surfaces 18, 19 having the same slope, in opposing directions, respectively. The ends 12a, 13a and the lower ends each are bent inwardly to bring the surfaces 18, 19 into abutting engagement. When the heat exchanger constituent members are stacked and soldered as a whole, the inclined surfaces 18, 19 of the ends 12a, 13a and lower ends are joined with each other through solder material melted out of flat plates 3.

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 in, for example, an oil cooler, an aftercooler, an intercooler, a radiator, or the like.

In this specification, the term "aluminum" includes aluminum alloy in addition to pure aluminum.

[0003]

2. Description of the Related Art In recent years, so-called plate-fin heat exchangers have been widely used as heat exchangers for oil coolers and the like. In this heat exchanger, first fluid passages through which external air flows and second fluid passages through which oil or the like flows in a direction orthogonal to the first air passages are alternately formed via flat plates. .

Regarding this type of heat exchanger, the applicant has
First, the first fluid flow path is formed by a flat plate that is disposed on both left and right sides and that has space maintaining projections at both upper and lower ends, and fins that are interposed between the upper and lower space maintaining projections. The second fluid flow passage is formed by flat plates arranged on both the left and right sides, and a second fluid flow passage forming body that is interposed between the flat plates and has an outer periphery having substantially the same shape and size as the flat plate.
A heat exchanger in which these heat exchanger constituent members are superposed in the order of a flat plate, a fin, a flat plate, and a second fluid flow path forming body and collectively brazed has been proposed (Actual No. Sho 63-116).
781, etc.).

Here, the second fluid flow path forming body is made of an aluminum extruded shape member composed of front and rear side walls in the shape of square rods and vertical connecting walls for connecting them. The upper and lower end portions and the lower end portions of the front and rear side walls are respectively bent inward, and the end faces are abutted against each other and joined by argon welding.

[0006]

However, it is very troublesome to join the end faces of the upper and lower ends, which are bent inside the front and rear side walls of the second fluid flow path forming member, by argon welding. It is not practical because it costs a lot and the manufacturing cost is high.

Further, it is not always easy to bend the upper and lower end portions of the front and rear side walls of the second fluid flow path forming member inwardly and butt them in close contact with each other so as to completely match each other. Since the end faces may be separated from each other or displaced from each other, and it is considered that the same thing occurs due to variations in dimensional accuracy, the bondability was not sufficient. Moreover, it is very time-consuming and inconvenient to carefully check and correct such gaps and deviations before stacking them with other heat exchanger components such as flat plates. It may become a factor to hinder.

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

[0009]

SUMMARY OF THE INVENTION The present invention, which has been made to achieve the above object, has a first fluid passage and a second fluid passage separated by a flat plate made of an aluminum brazing sheet.
Fluid flow channels are alternately provided, and the first fluid flow channel is interposed between the flat plates disposed on both left and right sides, a pair of spacers disposed on both upper and lower sides between the flat plates, and between both spacers. And a second fluid flow path formed by
A heat exchanger formed by flat plates arranged on both the left and right sides and a second fluid flow path forming body interposed between the flat plates and having an outer periphery of substantially the same shape and size as the flat plate, In the method of manufacturing by fining, flat plate, and the second fluid flow path forming body in the order of these heat exchanger constituent members and brazing them together, the second fluid flow path forming body is formed into a square bar-shaped front and rear. Using aluminum extruded shape material consisting of both side walls and vertical connecting walls connecting them, remove the upper and lower end portions of the vertical connecting wall, and heat the upper and lower end portions of the front and rear side walls with the flat plate or the like. Cutting in a direction intersecting with the stacking direction of the container component and at the upper end portions and the lower end portions of the front and rear side walls so that inclined surfaces having the same gradient are formed in opposite directions.
When the upper and lower ends of the front and rear side walls are respectively bent inward, these inclined surfaces are abutted against each other, and at the time of collective brazing after the heat exchanger constituent members such as the above flat plate are superposed. This includes joining the inclined surfaces of the upper end portion and the lower end portion of the front and rear side walls of the second fluid flow path forming body to each other by the brazing material eluted from the flat plate.

According to the above method, the second fluid flow path forming member is made of an aluminum extruded shape member made of square rod-shaped front and rear side walls and a vertical connecting wall for connecting them. Both end portions are removed, and the upper and lower end portions of the front and rear side walls are opposite to each other in the direction intersecting the stacking direction of the heat exchanger constituent members such as the above flat plate and at the upper and lower end portions of the front and rear side walls. By cutting so that inclined planes that have the same slope in the direction are formed and bending the upper and lower ends of the front and rear side walls inward, these inclined planes are abutted against each other. Not only when they are in close contact with each other so that they completely match, but also when there is a slight gap between them or when the front and rear side walls are slightly displaced in the front-rear direction so that they approach each other. However, when the heat exchanger constituent members such as flat plates are superposed on each other, the inclined end faces are pressed against each other to eliminate these gaps and gaps, and to join them in close contact so that they are almost completely matched. Done. In addition, the bonding area is increased as compared with the conventional method, which increases the bonding strength.

Further, during collective brazing after the heat exchanger constituent members such as flat plates are superposed on each other, the brazing filler metal eluted from the flat plates causes the upper and lower end portions of the front and rear side walls of the second fluid flow path forming member to form. Since the inclined surfaces are joined to each other, there is no need to perform a separate process such as argon welding as in the conventional method.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings.

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

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

That is, this heat exchanger (1) has 12
The external air first fluid flow path (A) and the twelve oil second fluid flow paths (B1) are arranged alternately and at right angles to each other. 6 second fluid channels for compressed air (B2) and 6 first fluid channels for external air on the right side through the common first fluid channel for external air (A)
It has aftercooler portions in which fluid channels (A) are arranged alternately and orthogonally to each other.

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

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

The second fluid flow passage (B2) for compressed air is formed by the left and right flat plates (3) and the second fluid flow passage forming body (5), like the second fluid flow passage for oil (B1). ing. However, the vertical connection wall (7) of the second fluid flow path forming body (5) has an arch-shaped protrusion (15).
Further, instead of the fluid passage hole (16), a parallel cylindrical tubular portion (17) having a substantially rhombic cross section is integrally provided (see FIGS. 2 and 3).

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

At the upper and lower ends of the left side plate (20) of the heat exchanger (1), an oil introduction pipe joint (21) and an oil discharge pipe joint (21) leading to the upper and lower header parts (2) of the oil cooler part are provided. 22) are respectively connected to the upper and lower ends of the right side plate (20), and the compressed air introduction pipe joint (23) and the compressed air discharge pipe joint (23) leading to both the upper and lower header parts (2) of the aftercooler portion are connected. 24) are connected respectively.

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

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

The second fluid flow path forming body (5) is made of an aluminum extruded shape material composed of square bar-shaped front and rear side walls (12) and (13) and vertical connection walls (7) connecting these, as a material. First,
The upper and lower ends of the vertical connecting wall (7) are removed (Fig. 4).
reference). In addition, the vertical connecting wall (7) is pressed or formed by a roll to form an arch-shaped protrusion (15) and a fluid passage hole (1
6) is formed, or the tubular portion (17) is formed by integral molding.

Next, the upper and lower end portions (1
2a), (13a), (12b) and (13b) in the direction that intersects the stacking direction of the heat exchanger components such as the flat plate (3) and at the upper end (12a) of the front and rear side walls (12) (13). ) (13a) to each other and lower end (12b)
The (13b) are cut so that inclined surfaces (18) and (19) are formed in opposite directions and have the same gradient (see FIG. 5). That is, the upper side (12a) of the front side wall (12) has a slanted surface (18) facing diagonally to the right, and the upper end (13a) of the rear side wall (13) has a slanting surface (19) facing diagonally upward to the left, Each of the lower end (12b) of the (12) has an inclined surface (18) directed obliquely downward to the left, and the lower end (13b) of the rear side wall (13) has an inclined surface (19) directed obliquely downward to the right. Cut the ends (12a) (13a) (12b) (13b). The slope of the inclined surfaces (18) (19) is about 30 with respect to the longitudinal direction of the front and rear side walls (12) (13).
A range of -60 ° is suitable.

Then, the upper and lower portions (12) of the front and rear side walls (12) (13) are
a) (13a) and the lower end (12b) (13b) are bent inward at a substantially right angle, and the upper end (12a) (13a) sloped surface (18) (19)
The inclined surfaces (18) and (19) of each other and the lower end portions (12b) and (13b) are butted against 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 slanted surfaces (18) and (19) are in close contact with each other so that they substantially match each other (Fig. 7 (a)).
There is a slight gap between them (see FIG. 7 (b)), and both front and rear side walls (12) and (13) are slightly displaced in the front-rear direction so that they approach each other (see FIG. 7 (b)). c)), and there is a slight gap between them, and both front and rear side walls (12) and (13) are slightly displaced in the front-rear direction (see Fig. 7 (d)). In either case, the joining is performed well as described later.

Next, the flat plate (3), the spacers (8) and (8a) and the corrugated fins (10), the flat plate (3) and the second fluid flow path forming body (5) are arranged in this order in the order of these heat exchangers. The members are overlapped (see FIG. 8). This allows the fluid passage holes on each plate (3) to
Upper and lower header parts (2) are formed by (4), the fluid passage hole (9) of the spacer (8), and the communication void part (14) of the second fluid flow path forming body (5). (See Figure 1).

Then, the heat exchanger constituent members such as the flat plates (3) stacked as described above are collectively brazed by, for example, a vacuum brazing method while being tightened in a stacking direction by a jig (FIG. 8). reference).

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

Further, as shown in FIGS. 7 (b) to 7 (d), the inclined surfaces (18) and (19) abutted against each other have a slight gap therebetween, or both front and rear walls (12 ) (13) Even if they are slightly offset in the front-back direction so that they come close to each other,
The heat exchanger components such as the flat plate (3) are clamped in the stacking direction by the jig, and the inclined surfaces (18) and (19) are pressed against each other, so that these gaps and deviations are eliminated, so both Are joined in close contact with each other so that they are almost completely matched. Therefore, for collective brazing, it is sufficient to use only a jig for fastening the heat exchanger constituent members such as the flat plate (3) in the stacking direction, and there is an advantage that the cost of the jig can be suppressed.

Finally, the oil introduction pipe joint (21) and the oil discharge pipe joint (22) are provided at the upper and lower ends of the left side plate (20), respectively.
Pipe fittings (23) for introducing compressed air at both upper and lower ends of the right side plate (20).
And compressed air discharge pipe fittings (24)
(2) Connect by the usual method so as to lead to (2) (see Fig. 1). In this way, 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, it is also possible to manufacture a heat exchanger having an independent oil cooler or aftercooler. Of course, the present invention can be applied.

[0032]

According to the method of manufacturing a heat exchanger of the present invention, the second fluid flow path forming member is made of an aluminum extruded shape member composed of square bar-shaped front and rear side walls and vertical connecting walls connecting them. As a result, the upper and lower end portions of the vertical connecting wall are removed, and the upper and lower end portions of the front and rear side walls are intersected with the stacking direction of the heat exchanger component members such as the flat plate and the upper ends of the front and rear side walls. By cutting so as to form inclined surfaces that are opposite to each other and have the same slope in the lower end portions, and bend the upper end portions and the lower end portions of the front and rear side walls inward, these inclined surfaces are mutually separated. Since they are abutted against each other, not only when the abutted inclined surfaces are in close contact with each other so as to completely match each other, there is a slight gap between them, or the front and rear side walls are close to each other. Even if you are slightly displaced in the direction,
When heat exchanger components such as flat plates are superposed, the inclined surfaces are pressed against each other to eliminate gaps and gaps between them, and the two are joined in close contact so that they are almost completely matched. . In addition, the bonding area is increased as compared with the conventional method, which increases the bonding strength. Therefore, the joining property between the tips of the upper and lower ends of the front and rear side walls is improved, and an excellent product in which fluid leakage hardly occurs can be obtained. Moreover, the workability is improved because it is not necessary to carefully check the abutting state of the inclined surfaces in the second fluid flow path forming body before superimposing it on another heat exchanger component such as a flat plate.

Further, during collective brazing after the heat exchanger constituent members such as flat plates are superposed on each other, the brazing filler metal eluted from the flat plates causes the upper and lower end portions of the front and rear side walls of the second fluid flow path forming member to form. Since the inclined surfaces are joined to each other, it is not necessary to perform a separate process such as argon welding as in the conventional method, and the heat exchanger can be manufactured easily and the manufacturing cost can be reduced accordingly.

[Brief description of drawings]

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

FIG. 2 is a partially cutaway enlarged perspective view showing a flow path configuration of an oil cooler portion and an aftercooler portion of the heat exchanger.

FIG. 3 is an exploded perspective view of constituent members of an oil cooler portion and an aftercooler portion of the heat exchanger.

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

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

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

FIG. 7 is an enlarged plan view of an essential part showing a state where the inclined surfaces of the upper and lower end portions of the front and rear side walls of the second fluid flow path forming member are butted to each other in the step of FIG. 6;

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

[Explanation of symbols]

A First fluid flow passage for external air B1 Second fluid flow passage for oil B2 Second fluid flow passage for compressed air 1 Heat exchanger 3 Flat plate made of aluminum brazing sheet 5 Second fluid flow passage forming body 7 Vertical connection wall 8 spacers 10 corrugated fins 12 front side wall 12a upper end part 12b lower end part 13 rear side wall 13a upper end part 13b lower end part 18 inclined surface 19 inclined surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Guo Di ▲ 祺 ▼ 6224, Kaiyamacho, Sakai City, Showa Aluminum Co., Ltd. In the company

Claims (1)

[Claims] 1. A first fluid flow path comprising alternating first fluid flow paths (A) and second fluid flow paths (B1) (B2) separated by a flat plate (3) made of an aluminum brazing sheet. 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 both flat plate (3),
The second fluid flow paths (B1) and (B2), which are formed by the fins (10) interposed between both spacers (8), have flat plates (3) arranged on both left and right sides and both flat plates (3). ) A heat exchanger (1) formed between a flat plate (3) and a second fluid flow path forming member (5) having an outer periphery of substantially the same shape and size as the flat plate (3).
(3), spacer (8) and fin (8), flat plate (3), second
In the method of manufacturing by superposing these heat exchanger constituent members 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 into a square bar-shaped front and rear. Remove the upper and lower ends of the vertical connecting wall (7) by using aluminum extruded profile consisting of both side walls (12) and (13) and the vertical connecting wall (7) that connects them,
(12) Place both upper and lower ends (12a) (13a) (12b) (13b) of (13) in the direction intersecting the stacking direction of the heat exchanger constituent members such as the flat plate (3) and both front and rear sides. Upper edge (12a) of wall (12) (13)
(13a) and the lower end (12b) (13b) cutting so as to form inclined surfaces (18) (19) that are opposite in direction and have the same slope, front and rear side walls (12) (13) Upper end of (12
a) (13a) and the lower ends (12b) (13b) are bent inward to bring the inclined surfaces (18) and (19) into contact with each other, and the heat exchange of the flat plate (3) and the like. The second fluid flow path forming body is formed by the brazing material eluted from the flat plate (3) during the collective brazing after the stacking of the component parts of the container.
It includes joining the inclined surfaces (18) (19) of the upper and lower ends (12a) (13a) and the lower ends (12b) (13b) of the front and rear side walls (12) (13) of (5) to each other. , Method of manufacturing heat exchanger.