JPH10131736A - Manufacture for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the number of processes at the time of temporarily assembling a brazing member. SOLUTION: A brazing member 20 for brazing a casing 3 to an upper plate 4 substantially has a disk shape whose outer peripheral edge part bent. The brazing member 20 has a bent part 21 inserted into the inner part of the upper so as to come into contact with the inner wall surface of a tank part and a a plate surface 23 temporarily assembled and disposed on the upper part of the casing 3 so as to come into contact with the upper surface of the casing 3. The brazing member 20 is provided with a bent part 21 for brazing the outer peripheral side of the upper plate 4 to the casing 3 and the plate surface 23 for brazing the inner peripheral side of the plate 4 to the casing 3. Thus, the casing 3 can be brazed to the upper plate 4 by one brazing member 20. Therefore, the number of processes for a temporary assembly can be decreased as compared with a case when a brazing operation has been conventionally carried out by using a plurality of brazing members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, for example, a heat exchanger for cooling engine oil of an automobile engine.

[0002]

2. Description of the Related Art As shown in FIG. 7, a heat exchanger for cooling automotive engine oil (hereinafter referred to as an oil cooler) has a substantially cylindrical shape having a flow path formed at a position substantially at the center of an axis. An oil cooler 50 is known. The oil cooler 50 includes a lower plate 51, a casing 52 installed and fixed on the upper surface of the lower plate 51, and an upper plate 53 fixed on an upper portion of the casing 52. A heat exchange core in which a plurality of heat exchange units 57 are stacked is housed inside the casing 52, and oil flowing inside each heat exchange unit 57 exchanges heat with cooling water passing through the inside of the casing 52. Cooled. The upper plate 53 has a hollow substantially annular shape with an open lower surface, and the upper plate 53 and the casing 52 have the same shape.
Is formed by each heat exchange unit 57
The tank portion 54 into which the oil that has passed through flows. On the inner periphery of the upper plate 53, an annular flat portion 53a is formed to escape from a mounting member (both not shown) for mounting to the engine. Fixed to

As shown in FIG. 8, an oil cooler 50 having such a structure is formed by stacking a lower plate (omitted in FIG. 8), a casing 52, and an upper plate 53, temporarily assembling them, and then integrating them. It is manufactured by attaching. Brazing between the upper plate 53 and the casing 52 is mainly performed using a plate-shaped brazing member 56 which is disposed on the upper surface of the casing 52 and is press-formed into a predetermined shape. However, the area of the outer peripheral side of the upper plate 53 has a small contact area when the upper plate 53 and the upper surface of the casing 52 are temporarily assembled, and a sufficient amount of brazing material cannot be obtained with the brazing member 56 alone. Therefore, in the related art, the above-mentioned plate-shaped brazing member 56 is used as a brazing member for brazing the upper plate 53 and the casing 52, and the wire rod mounted inside the upper plate 53 is formed in a C-shape. The brazing member 55 formed in the above was used.

[0004] These brazing members 56 are mounted by the following steps, and the upper plate 53 is temporarily assembled to the casing 52. The brazing member 55 is inserted into the upper plate 53 while being elastically deformed, and is mounted so as to be in contact with the outer wall surface of the inner wall surface of the tank portion 54 of the upper plate 53. By disposing the upper plate 53 on which the brazing member 55 is mounted on the upper part of the casing 52 having the brazing member 56 on the upper surface, the brazing members 55 and 56 are mounted between the upper plate 53 and the casing 52. You.

[0005] By mounting the brazing members 55 and 56 in this manner and heating them in a temporarily assembled state, the inner peripheral portion of the upper plate 53 and the casing 52 are brazed by the brazing member 56, The outer peripheral portion of the upper plate 53 and the casing 52 are brazed by a brazing member 55.

[0006]

However, as described above, a plurality of brazing members 55 and 56 are used as brazing members for brazing the upper plate 53 and the casing 52.
In the case of using, the brazing members 55 and 56 have to be mounted on the upper plate 53 or the casing 52, respectively, and there has been a problem that a number of steps are required when performing temporary assembly.

Further, in order to braze the outer peripheral portion of the upper plate 53 and the casing 52 satisfactorily, a brazing member 55 inserted into the upper plate 53 is provided at the joint between the upper plate 53 and the casing 52. , That is, a position in contact with the brazing member 56. Therefore, after the upper plate 53 is disposed on the upper portion of the casing 52 and temporarily assembled, the brazing member 55 mounted inside the upper plate 53 must be moved to a position where the brazing member 55 comes into contact with the brazing member 56. Work was required.

Accordingly, the present invention has been made in view of the above-mentioned problems, and has as its object to reduce the number of parts and the number of parts required for temporary assembly.

[0009]

According to the first aspect of the present invention, there is provided a brazing member (20) in which a bent portion (21) contacts an inner wall surface of a tank (10). Therefore, a sufficient amount of brazing material can be obtained when brazing the casing (3) and the upper mounting member (4). Therefore, the brazing between the upper mounting member and the casing, which has been conventionally brazed using the plate-shaped brazing member and the brazing member mounted on the inner wall surface of the tank portion, can be performed by one brazing member. Accordingly, the number of parts required for brazing the upper mounting member and the casing can be reduced. Further, since the brazing of the upper mounting member and the casing can be performed by one brazing member, the number of steps of mounting the brazing member to the upper mounting member and the casing can be reduced. Furthermore, since the part of the brazing member inserted inside the upper mounting member, that is, the bent portion, and the part of the brazing member that is in contact with the upper surface of the casing are integral, the upper mounting member is attached to the casing as in the prior art. After the temporary assembly, there is no need for a complicated operation of moving the brazing member mounted inside the upper mounting member to the joint position between the upper mounting member and the casing.

Further, according to the second aspect of the present invention, since the bent portion (21) of the brazing member (20) is formed by bending a substantially plate-shaped brazing material, the bent portion can be easily formed. it can. In addition, since the bent portion is bent at least twice, it is possible to obtain a sufficient amount of brazing material for brazing the upper mounting member and the casing.

Further, according to the invention of claim 3, the same effect as that of claim 1 can be obtained. According to the invention of claim 4, the same effect as that of claim 2 can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Oil cooler 1
Is mounted between an engine block (not shown) and an oil filter (not shown) to cool engine oil (heat medium in the claims; hereinafter abbreviated as oil) for lubricating an engine operating portion (not shown). This is a heat exchanger that cools by exchanging heat with water (hereinafter abbreviated as cooling water).

The oil cooler 1 includes a plate-shaped lower plate 2 made of, for example, stainless steel, a substantially cylindrical casing 3 made of, for example, stainless steel and fixed on the upper surface of the lower plate 2, and an oil cooler 1 A fixed upper plate 4 made of, for example, stainless steel. Inside the casing 3, there is disposed a heat exchange core formed by laminating a plurality of heat exchange units 5 each having a flow passage through which oil flows. Although not shown, the heat exchange unit 5 has a pair of substantially annular bowl-shaped plates opposed to each other, and the heat exchange core has a substantially cylindrical shape. A central hole 5a is formed in a portion that becomes the axis center of the heat exchange unit 5, and an oil flow path in the heat exchange unit 5 is separated from the oil flow path in the heat exchange unit 5 at a position that becomes the axis center of the heat exchange core. A channel B is formed.

The lower plate 2 is fixed to the engine block via an O-ring 2a. One end of the lower plate 2 communicates with the oil passage of the engine, and the other end communicates with the central hole of the heat exchange unit 5. A central hole 6 is formed, and an inflow hole 7 for flowing into the heat exchange unit 5 is formed on a side of the center hole 6. A cooling water inlet pipe for introducing low-temperature cooling water into the casing 3 and a cooling water outlet pipe (not shown) for leading out heat-exchanged cooling water are connected to the side peripheral surface of the casing 3. Have been.
Outflow holes 8 are formed in the upper surface of the casing 3 to guide oil flowing out of the heat exchange unit 5 into a tank portion 10 described below. Also, the casing 3
A central hole 9 communicating with the central hole of the heat exchange unit 5 is formed at the center of the upper surface of the heat exchange unit 5.

The upper plate 4 has a hollow and substantially annular shape with an open lower surface, and the space defined by the upper surface of the casing 3 receives the oil flowing out of each heat exchange unit 5. The tank 10 is provided. The tank portion 10 has a plurality of outflow holes 11 for leading oil in the tank portion 10 toward an oil filter (not shown). A central hole 12 is formed in the center of the upper plate 4 to recirculate the oil that has passed through the oil filter to the engine side through the central hole of the heat exchange unit 5 and the central hole of the lower plate 2. . The peripheral edge of the central hole 12 has an annular flat portion 4a for receiving a load when a hollow bolt (not shown) for fixing the oil cooler 1 to the engine block is tightened together with the oil filter arranged above. Are formed.

Reference numeral 20 denotes a brazing member described later, and the upper plate 4 and the casing 3 are brazed and fixed by heating and melting the brazing member 20. The hot oil that has flowed out of the engine is
Flows into the inside of each heat exchange unit 5 and flows in the heat exchange unit 5 in an annular shape. At this time, the oil is cooled by exchanging heat with cooling water flowing inside the casing 3. The cooled oil flows out of the outlet 8, the tank 10,
The oil is sent to the oil filter through the outflow hole 11. The oil filtered by the oil filter flows down through the central hole 12 of the upper plate 4, the central hole 9 of the casing 3, the oil passage B of the heat exchange core, and the hollow bolts arranged in the central hole 6 of the lower plate 2. And return to the engine side.

By the way, as shown in FIG. 3, the oil cooler 1 having such a structure includes a lower plate 2 (not shown in FIG. 3), a casing 3 containing a heat exchange core therein, and an upper plate 2 in order from the bottom. It is manufactured by stacking and temporarily assembling the plates 4 and then brazing them together. At this time, as the brazing member 20 for brazing the casing 3 and the upper plate 4, a brazing member 20 having a substantially disk shape with an outer peripheral edge bent as shown in FIGS. .

The brazing member 20 has a substantially disk shape, and has a bent portion 21 formed at an outer peripheral edge thereof so as to be substantially perpendicular to a plate surface 23. The bent portion 21 is formed by bending the outer peripheral edge of a plate-shaped brazing material (for example, a copper brazing material having a thickness of about 0.1 mm) formed into a substantially disk shape by press forming twice so as to be folded. It is formed. As shown in FIG. 4, a number of notches 22 are formed in the outer peripheral edge of the brazing member 20 formed into a substantially disk shape by press molding, and the outer peripheral edge is formed in order to form the bent portion 21. The part is easy to bend.

An opening 23a communicating with the center hole 9 of the casing 3 and the center hole 12 of the upper plate 4 when temporarily assembled is formed at the center of the brazing member 20. Further, the plate surface 23 of the brazing member 20 is formed with an outflow hole 8 of the casing 3 and an opening 23b communicating with the tank portion 10 of the upper plate 4 when temporarily assembled.

The brazing member 20 is inserted and mounted inside the upper plate 4 such that the bent portion 21 contacts an outer wall surface of the inner wall surface of the tank portion 10. continue,
By disposing the upper plate 4 on which the brazing member 20 is mounted on the upper portion of the casing 3, the upper plate 4 is temporarily assembled to the casing 3. The brazing member 20 mounted on the upper plate 4 has a portion around the opening 23 a locked by the bottom surface of the flat portion 4 a of the upper plate 4.

When heated in such a temporarily assembled state, the brazing member is melted and brazing is performed. An inner peripheral portion of the upper plate 4 is brazed by a portion of the brazing member 20 around the opening 23a. On the other hand, the outer peripheral portion of the upper plate 4 is
Is brazed by the bent portion 21. At this time, the bent portion 21 is formed on the outer wall surface of the inner wall surface of the tank portion 10.
Since the brazing member 20 is inserted so as to be in contact with the upper plate 4, a sufficient amount of brazing material can be obtained, and the outer peripheral portion of the upper plate 4 can be favorably brazed.

As described above, the shape of the brazing member 20 is substantially disc-shaped with its outer peripheral edge bent so as to be in contact with the inner wall surface of the tank portion 10 when inserted into the upper plate 4. Thus, the brazing between the inner peripheral portion of the upper plate 4 and the casing 3 and the brazing between the outer peripheral portion of the upper plate 4 and the casing 3, which have conventionally been performed by separate brazing members, are performed in one step. Two brazing members 20
Can be done by Therefore, as compared with the manufacturing method in which the upper plate and the casing are brazed by the plate-shaped brazing member and the brazing member in which the wire is formed into a substantially C-shape as described in the section of the prior art, the number of parts is smaller. Can be reduced. Also, since the upper plate 4 and the casing 3 can be brazed by one brazing member 20, the number of steps required when the brazing member 20 is mounted on the upper plate 4 and the casing 3 is reduced. can do.

Further, a portion of a brazing member 20 for brazing the inner peripheral portion of the upper plate 4 to the casing 3, that is, a bent portion 21, and a brazing portion of the outer peripheral portion of the upper plate 4 to the casing 3. Brazing member 20 for brazing
, That is, the plate surface 23 is integrated. Also,
The brazing member 20 inserted into the upper plate 4 has the periphery of the opening 23a locked by the bottom surface of the flat portion 4a of the upper plate 4, so that the plate surface 23 of the brazing member 20 is The upper plate 4 is temporarily attached to the casing 3 in a state where the upper plate 4 is in contact with the casing 3. Therefore, it is not necessary to perform a complicated operation of temporarily assembling the upper plate to the casing and moving the brazing member mounted inside the upper plate to a joining position between the upper mounting member and the casing as in the related art. .

By the way, the brazing member 20 melts when heated and becomes a liquid. Therefore, if the gap between the upper plate 4 and the casing 3 at the time of temporary assembly is large, the molten brazing material is easily moved. Therefore, it is necessary to reduce the gap between the upper plate 4 and the casing 3 at the time of provisional assembly because there is a possibility of localization. That is, it is necessary to use the brazing member 20 having a thickness equal to or less than a predetermined thickness. However, when a thin brazing material is used as the brazing member 20, if the bent portion 21 is formed by bending the outer peripheral edge of the brazing member 20 once, the inner peripheral portion of the upper plate 4 and the casing 3 are bent. It is not possible to obtain a sufficient amount of brazing material for brazing. Therefore, in order to obtain a sufficient amount of brazing material for brazing the inner peripheral portion of the upper plate 4 and the casing 3, the outer peripheral edge of the brazing member 20 is formed by bending at least twice. Is done.

In the embodiment described above, the embodiment in which the bent portion is formed by bending the outer peripheral edge of the brazing member pressed into a substantially disk shape twice is described. If the number of times of bending is two or more, a sufficient amount of brazing material for brazing the outer peripheral portion of the upper plate and the casing 3 can be obtained. Therefore, as shown in FIG. 6, the brazing member 30 having the bent portion 31 formed by, for example, bending three times may be mounted on the upper plate 4, and the number of times the outer peripheral edge of the brazing member is bent is not particularly limited. .

According to the above-described embodiment,
Although the embodiment in which the bent portion is formed by bending a plate-shaped brazing material has been described, for example, a brazing member having a bent portion on the outer peripheral edge may be formed using a mold or the like. Further, in the above-described embodiment, the embodiment in which the present invention is applied to the oil cooler including the substantially cylindrical casing and the substantially annular upper plate has been described, but the upper plate having the tank portion inside is described. If the oil cooler is brazed and fixed to the upper part of the casing, the present invention can be applied. Therefore, the shapes of the upper plate and the casing are not particularly limited.

[Brief description of the drawings]

FIG. 1 is a view showing an entire brazing member according to an embodiment of the present invention, FIG. 1 (a) is an overall perspective view of the brazing member, and FIG. 1 (b) is a view of the brazing member as viewed from above. FIG.

FIG. 2 is a cross-sectional view of a temporarily assembled oil cooler according to the embodiment of the present invention.

FIG. 3 is an exploded view showing a temporary assembling method of the oil cooler according to the embodiment of the present invention.

FIG. 4 is a diagram showing a press-formed brazing member as viewed from above according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 1 (b).

FIG. 6 is a partial sectional view of a brazing member according to another embodiment of the present invention.

FIG. 7 is a sectional view of a conventional oil cooler temporarily assembled.

FIG. 8 is an exploded view showing a conventional method of temporarily assembling an oil cooler.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil cooler 3 Casing 4 Upper plate which is an upper mounting member 5 Heat exchange unit 10 Tank part 20 Brazing member 21 Bending part 23 Plate surface

Claims (4)

[Claims] 1. A heat exchanger comprising a casing and a plurality of heat exchange units which are housed inside the casing, are formed by joining a pair of bowl-shaped plates to face each other, and have a fluid passage through which a heat medium passes. A method for manufacturing a heat exchanger, comprising: an exchange core; and an upper opening member having an opening at a lower surface, a tank portion into which the heat medium that has passed through the fluid passage flows, and a brazing member fixed to an upper portion of the casing. In the above, a substantially plate-shaped brazing member having a bent portion bent with respect to a plate surface is mounted on the upper mounting member such that the bent portion comes into contact with the inner wall surface of the tank portion, and the plate surface is formed of the casing. Heat in a state where it is arranged so that it contacts the top surface,
A method of manufacturing a heat exchanger, comprising heating and melting the brazing member to braze and fix the casing and the upper mounting member. 2. The method according to claim 1, wherein the bent portion is formed by bending a substantially plate-shaped brazing material at least twice. 3. A heat exchanger in which a plurality of heat exchange units which are housed in the casing, are formed by joining a pair of bowl-shaped plates to face each other, and have a fluid passage through which a heat medium passes, are stacked. An exchanger core, which is disposed on an upper portion of the casing, has a tank portion into which the heat medium that has passed through the fluid passage flows, and is disposed on an upper surface of the casing, and is bent to contact an inner wall surface of the tank portion. And an upper mounting member brazed to the casing by a brazing member having a bent portion. 4. The upper mounting member and the casing are brazed and fixed by the brazing member having the bent portion formed by bending a substantially plate-shaped brazing material at least twice. The heat exchanger according to claim 3, wherein