JP2007248031A - Laminated heat exchanger and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost laminated heat exchanger that is compact and easy to assemble and can be assembled with a small amount of material in a laminated heat exchanger using a bar material and a plate material.
SOLUTION: A thin plate 3 having a pair of communication holes 1 and 2 at both ends, and a pair of thick end members 5 and a bar member 6 each made of a press-molded body. The end member 5 is generally U-shaped in plan and has an annular portion 4 at one corner.
[Selection] Figure 2

Description

  The present invention relates to a stacked heat exchanger in which plates and bar materials are alternately stacked.

  Patent Document 1 below discloses a heat exchanger in which bar materials and plates are alternately overlapped and the openings are made different from each other in the stacking direction. In this heat exchanger, a header tank is joined to each opening.

  Assuming that this header tank is omitted, instead of the bar material, a relatively thick plate is formed in a frame shape, a pair of communication holes are formed at the corners, and communication holes are also provided in each plate. This is known as Patent Document 2 below.

JP 2002-318089 A JP 2001-66078 A

  The former laminated heat exchanger is one in which a header tank is welded to each side of the outer periphery after brazing a laminated structure core combining a plate and a bar. Instead, it is necessary to seal the whole core in a casing with packing or the like. In either case, there are disadvantages that the manufacturing cost is high and a relatively large header tank and the like are required and the compactness is lacking.

The latter stacked heat exchanger can be compactly formed, but a relatively thick plate is press-molded, leaving only a small part of the frame part and the fluid passage part, and most of the die As a result, the material is wasted and the mold cost is increased, which leads to an increase in the cost of the heat exchanger as a whole.
Then, this invention aims at providing the heat exchanger which solves these problems.

The present invention according to claim 1 is a thin plate (3) having a pair of communication holes (1) (2) at both ends,
It is formed thicker than the plate (3) by press molding, and is placed on both ends of the plate (3). The whole is a flat U-shape, and one corner is annular. A pair of end members (5) having an annular portion (4) formed; and
A pair of bar members (6) having the same thickness as the end member (5) and connecting between the U-shaped ends of both end members (5) on the plate (3). Configure
This is a laminated heat exchanger in which a plurality of elements are laminated and the components are integrally brazed and joined to each other in the laminated state.

The present invention according to claim 2 is the method according to claim 1,
It is a stacked heat exchanger configured such that the connecting portion between the end member (5) and the bar member (6) is fitted in a wave shape in the planar direction or the vertical direction.

According to a third aspect of the present invention, in the method for manufacturing a stacked heat exchanger according to the first or second aspect,
The bar-type (6) is configured to be fitted to the end member (5) from the outside in the plane direction, and the bar-type material (6) is compressed from the outside and brazed in a compressed state in the laminating direction. It is a manufacturing method of an exchanger.

The present invention as set forth in claim 4 is characterized in that, in claim 3,
In this method, the bar member (6) is brazed in a state where the bar member (6) protrudes slightly outward from the outer surfaces of the end member (5) and the plate (3).

In the laminated heat exchanger according to the present invention, a pair of thick end members 5 and a bar member 6 disposed between thin plates 3 are formed as separate members, and the end members 5 are formed of a press-molded body. 5 and the bar material 6 are joined together, so that there is little waste of materials accompanying press molding, and it is easy to assemble at a low cost, and a compact stacked heat exchanger can be provided.
In the above configuration, when the connecting portion between the end member 5 and the bar member 6 is configured to be fitted in a wave shape in the planar direction or the vertical direction, the reliability of brazing can be improved.

In the manufacturing method of the laminated heat exchanger, the bar material 6 is fitted from the outside in the planar direction of the end member 5, and the bar material 6 is compressed from the outside and brazed in a compressed state in the lamination direction. In some cases, the reliability of brazing can be improved.
In the above configuration, when the bar member 6 is brazed in a state of slightly protruding outward from the outer surfaces of the end member 5 and the plate 3, the reliability of brazing can be further improved.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory perspective view of the end member 5 and the bar member 6 disposed between the plates of the laminated heat exchanger of the present invention, and FIG. 2 is an exploded perspective view of the main part of the heat exchanger. FIG. 3 is an explanatory view of assembly when the heat exchanger is brazed, FIG. 4 is a front view of the heat exchanger, and FIG. 5 is a plan view thereof.

In the heat exchanger of this example, as shown in FIG. 2, a pair of bar members 6, end members 5 or second end members 5a are interposed between a pair of plates 3 and a second plate 3a.
As shown in FIG. 1, the end member 5 has a thick U-shaped flat surface and an annular portion 4 formed in an annular shape at one corner. The annular portion 4 has a function of a communication hole.
The end member 5 is manufactured by press-molding a plate that is thicker than the plates 3 and 3a. At both end portions of the end member 5, fitting portions 9 formed in a corrugated shape are provided. Further, the bar member 6 connects the end portions on both sides of the pair of end members 5 separated from each other as shown in FIGS. 1 and 2, and both end portions thereof are aligned with the fitting portions 9 of the end member 5. To do. The bar material 6 can be manufactured from a bar material or a plate material by press molding.

A brazing material 7 is interposed between the fitting portion 9 of the end member 5 and the end portion of the bar material 6. The brazing material 7 can be a clad material having a brazing material on both sides. Alternatively, a powder brazing material can be applied to the connecting portion via a binding agent.
In this example, as shown in FIG. 2, every other end member 5 and second end member 5a are arranged. The second end member 5 a is disposed at a position where the second annular portion 4 a is different from the annular portion 4 of the end member 5. The second annular portion 4a also functions as a communication hole.

  Next, the outer peripheries of the plate 3 and the second plate 3a are substantially aligned with the outer periphery of the connecting member of the bar member 6 and the end member 5, and the communication holes 1 are aligned with the holes of the annular portions 4 and the second annular portion 4a. The communication hole 2 is formed. Further, the plate 3 is provided with dimples 10 protruding upward in the drawing, and the second plate 3a is provided with dimples 10 protruding downward, the height of which is equal to the height of the bar member 6 and the end member 5. It can be half or the same. In the half case, the tips of the dimples 10 of the pair of plates 3 and the second plate 3a are in contact with each other, and the two are brazed together.

Further, when the height of the dimple 10 is the same as the height of the bar member 6, the dimple 10 of the plate 3 and the dimple 10 of the second plate 3a are arranged so as to be shifted from each other, and the plates facing each other are arranged. The contact surface is contacted and the contact portion is brazed. In addition, you may interpose an inner fin instead of these dimples.
Inner fins 8 shown in FIG. 2 are arranged on the upper surface side of the second plate 3a. These parts are alternately combined to form a heat exchanger assembly, and as shown in FIG. 3, the side is crimped by a pair of jigs 11 and the vertical direction is crimped by a jig (not shown). In FIG. 3, the plate 3 is omitted.

When the pair of jigs 11 are fastened together in the compression direction, the fitting portion 9 is formed in a corrugated shape, so that the joint portion between the bar member 6 and the end member 5 is fastened. In this fastened state, the whole is inserted into a high-temperature furnace, the brazing material coated on one surface of each part or the applied brazing material is melted, and integrally brazed and fixed.
As shown in FIGS. 3 and 4, a pair of bosses 12 are arranged on the uppermost surface of the core in this example, and the lower surface is closed by an end plate 13 having no holes.

Next, FIG. 6 is a perspective view of the bar member 6 and the end member 5 of another heat exchanger of the present invention. The difference from that of FIG. 1 is that both ends of the bar member 6 and the fitting portions of the end member 5 are fitted. Nine.
In this example, the end members 5 and the end portions of the bar material 6 have fitting portions 9 formed in a waveform in the vertical direction. Then, the bar material 6 and the fitting portion 9 are fitted through the brazing material 7 aligned with the fitting portion 9. In this case, the stacked heat exchanger cores need only be brazed and fixed in the crimped state only in the vertical direction.

  In FIG. 3, the fitting portion 9 is formed in a wavy shape in the horizontal direction so that a slight step D is generated between the side surface of the bar member 6 and the side surface of the end member 5 with the brazing material 7 interposed. Formed. As a result, only the bar material 6 is securely crimped by the jig 11 and the reliability of brazing can be improved.

  In this example, the plate 3 and the second plate 3a are 0.2 mm to 1 mm as an example having a relatively thin plate thickness, and the second end member 5a, the end member 5 and the bar member 6 are relatively thick. It can be set to 1 mm to 5 mm. Thereby, each flow path cross section can be enlarged and a heat exchange medium can be smoothly distributed.

  In FIG. 5, a heat exchange medium for cooling, for example, heated oil is guided from the first communication hole 1 of one boss 12, and is circulated between the pair of end members 5 having the inner fins 8. The boss 12 is caused to flow out from the first communication hole 1. Also, cooling water flows as the other heat exchange medium from the second communication hole 2 of one of the bosses 12, which is on the dimple side of the pair of plates 3 and the second plate 3 a, and a pair of second end members. It is made to distribute | circulate to the space which has 5a, and is made to flow out from the 2nd communicating hole 2 of the other boss | hub 12. And heat exchange can be performed between cooling water and oil.

The perspective explanatory drawing of the end member 5 and the bar material 6 used for the laminated heat exchanger of this invention. The exploded perspective view of the heat exchanger. The top view which shows the crimping | compression-bonding state at the time of brazing of the same heat exchanger.

The front view of the heat exchanger. FIG. The perspective explanatory drawing of the bar material 6 and the end member 5 used for the other laminated heat exchanger of this invention.

Explanation of symbols

1 communication hole 2 communication hole 3 plate
3a Second plate 4 Annular part
4a Second annular part 5 End member
5a Second end member

6 Bar material 7 Brazing material 8 Inner fin 9 Insertion part
10 dimples
11 Jig
12 Boss
13 End plate

Claims (4)

A thin plate (3) having a pair of communication holes (1) (2) at both ends; and
It is formed thicker than the plate (3) by press molding, and is placed on both ends of the plate (3). The whole is a flat U-shape, and one corner is annular. A pair of end members (5) having an annular portion (4) formed; and
A pair of bar members (6) having the same thickness as the end member (5) and connecting between the U-shaped ends of both end members (5) on the plate (3). Configure
A stacked heat exchanger in which a plurality of elements are stacked and each component is integrally brazed and joined in the stacked state. In claim 1,
A stacked heat exchanger configured such that a connecting portion between an end member (5) and a bar member (6) is fitted in a wave shape in a planar direction or a vertical direction. In the manufacturing method of the laminated heat exchanger of Claim 1 or Claim 2,
The bar-type (6) is configured to be fitted to the end member (5) from the outside in the plane direction, and the bar-type material (6) is compressed from the outside and brazed in a compressed state in the laminating direction. Exchanger manufacturing method. In claim 3,
A manufacturing method of a laminated heat exchanger in which the bar material (6) is brazed in a state of slightly protruding outward from the outer surfaces of the end member (5) and the plate (3).

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