JP2004205055A - Plate type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simultaneously perform a reduction in flow resistance in the hole edge parts of communication holes between elements and a stable positioning between the hole edge parts in assembly and brazing. <P>SOLUTION: The hole edge of the access port of a first plate 3 is joined to the hole edge of the access port of a second plate 4. A slightly ring-shaped first rise part 6 is formed all around the hole edge part of the access port 1 of the first plate 3, and a second rise part 7 rising stepwise from the first rise part 6 is formed integrally with only a part of the first rise part 6. The height of the second rise part 7 is set to sufficiently exceed the thickness of the second plate 4, and the first rise part 6 and the second rise part 7 are fitted into the access port 1 of the second plate 4. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stacked plate heat exchanger in which a pair of dish-shaped plates are overlapped with each other in opposite directions to form peripheral elements and elements are formed, and the respective elements are bonded in respective communication holes.
[0002]
[Prior art]
The laminated plate type heat exchanger is formed in an elongated dish shape and has a first plate and a second plate each having communication holes at four corners thereof, and the peripheral edges of the first plate and the second plate are liquid-tight. In addition, it is known that an element is formed by joining the elements in a thickness direction, and the communication holes are integrally joined together. Then, different fluids are passed through the front side and the back side of one plate, respectively, and heat exchange is performed between the two fluids.
[0003]
In a plate type heat exchanger in which such plates are stacked, there is one in which a gap between the plates is extremely narrow. Each of the communication holes is slightly burred from one side, and the portion is fitted into the opening of the other element to be aligned, and each element is aligned to form a heat exchanger.
[0004]
[Problems to be solved by the invention]
In such a laminated plate type heat exchanger, when the rising portion of the hole edge of the communication hole is made higher, there is a disadvantage that the flow resistance at the hole edge of the fluid flowing out and in between the plates from there increases. .
Further, if the burring portion is made too small, there is a possibility that when the plates are stacked, one edge of the hole is lifted up by the edge of the other hole, and assembly failure may occur.
[0005]
Further, the first plate and the second plate constituting each element need to be formed so that the entire edge on one side is annularly raised so as to be aligned with each other at the peripheral edge. In that case, a more precise mold is required, and it is necessary to increase the fitting accuracy.
Further, when the peripheral portion is positioned and fixed by caulking, there is a disadvantage that the caulking mold becomes expensive.
Accordingly, an object of the present invention is to provide a plate heat exchanger which eliminates these various drawbacks, reduces the flow resistance of each fluid at the inlet and outlet, and is easy to assemble and easy to manufacture a mold.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a pair of first plates (3) formed in a dish shape with a pair of entrances (1) and (2) which are respectively spaced apart from each other, and at least one peripheral edge is raised. ) And a second plate (4),
The first plate (3) and the second plate (4) are alternately stacked, their peripheral edges are in contact with each other, the respective entrances (1), (2) are aligned in the stacking direction, and Are in contact with each other and their contact parts are brazed,
A small ring-shaped first rising portion (6) is formed all around the hole edge of the entrance (1) of the first plate (3), and a part of the first rising portion (6). Only, a second rising portion (7), which rises stepwise, is formed integrally,
The height of the second rising portion (7) exceeds the thickness of the second plate (4) sufficiently, and the first rising portion (6) and the second rising portion (7) are connected to the second plate (4). ) Is a plate-type heat exchanger inserted into the entrance (1).
[0007]
The present invention described in claim 2 is based on claim 1,
The outer peripheries of the first plate (3) and the second plate (4) are formed in a rectangular shape, and the entrances (1) and (2) are arranged at respective corners,
The second rising portion (7) is a plate heat exchanger formed so as to face an adjacent corner.
[0008]
According to a third aspect of the present invention, there is provided a pair of first plates (3) formed in a dish shape by opening a pair of entrances (1) and (2) which are respectively separated from each other, and having at least one peripheral edge rising. ) And a second plate (4),
The first plate (3) and the second plate (4) are alternately stacked, their peripheral edges are in contact with each other, the respective entrances (1), (2) are aligned in the stacking direction, and Are in contact with each other and their contact parts are brazed,
A slight ring-shaped first rising portion (6) is formed all around the hole edge of the entrance (1) of the first plate (3), and the first rising portion (6) is spaced apart from the first rising portion (6). Then, a plurality of locking claws (5) are launched together,
The height of the locking claw (5) to the tip of the second plate (4) sufficiently exceeds the thickness of the second plate (4), and the first raised portion (6) and the locking claw (5) are connected to the second plate (4). This is a plate-type heat exchanger fitted into the entrance (1) of 4).
[0009]
The present invention described in claim 4 is the invention according to any one of claims 1 to 3,
A plurality of claws (8) are integrally formed on the periphery of one of the first plate (3) and the second plate (4), and the claws (8) are bent to form an edge of the other plate. And a plate-type heat exchanger.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
1 is a plan view showing an element 20 which is a component of the plate heat exchanger of the present invention, FIG. 2 is a sectional view taken along the line II of FIG. 1, and FIG. 3 is a sectional view taken along the line III-III of FIG. 4 is a sectional view taken along the line IV-IV in FIG. FIG. 5 is an exploded perspective view of a main part of the first plate 3 and the second plate 4 of the element 20, and FIG. 6 is a cross-sectional view of a main part of a heat exchanger in which a plurality of elements 20 are stacked. FIG. 7 is a schematic perspective view of the edge of the hole at the entrance 1 of the first plate 3.
[0011]
This heat exchanger comprises a laminate of a number of elements 20, each of which has a pair of first and second plates 3 and 4 whose outer circumferences are aligned with each other, as shown in FIGS. The first plate 3 and the second plate 4 have small flange portions 12 and 13 which are aligned with each other at their peripheral edges, and they are in surface contact with each other. As shown in FIG. 5, an annular concave portion 14 is formed inside the small flange portion 12 of the first plate 3, and a flat surface 18 is provided inside the annular concave portion 14. The height of the flat surface 18 is the same as that of the small flange portion 12. A pair of entrances 2 are formed on the flat surface 18 at diagonal corners in the longitudinal direction, and the edge of the hole is raised to the inner surface side to form a burring portion 2a.
[0012]
A recess 21 is formed at the other diagonal corner, and the height of the recess 21 is the same as that of the annular recess 14. The entrance 1 is bored in the recess 21 and the edge of the hole slightly protrudes toward the outer surface. As shown in FIG. 7, the edge of the hole has a low annular first rising portion 6, and a second rising portion 7 protrudes from the lower first rising portion 6 in a stepped manner. It is formed high enough. The second rising portion 7 is formed to face a corner of the rectangular first plate 3.
[0013]
Next, the second plate 4 is formed in a dish shape which is shallower than the depth of the annular concave portion 14 of the first plate 3, and a large number of dimples 11 are formed on the inner surface of the plate so as to protrude. A pair of entrances 1 into which the first rising portion 6 and the second rising portion 7 in the entrance 1 of the first plate 3 fit are formed, and the burring portion 2a of the entrance 2 of the first plate 3 fits. It has a pair of entrances and exits 2.
A claw portion 8 is formed at an appropriate position on an edge of the small flange portion 12 of the first plate 3. Then, the pair of first plate 3 and second plate 4 are fitted as shown in FIGS. 1 to 4, and the claw 8 projecting from the peripheral edge of the first plate 3 is bent to form the element 20.
[0014]
Such elements 20 are stacked and assembled as shown in FIG. At least one surface of each plate in contact with each other is coated with a brazing material, and inserted into a high-temperature furnace in an assembled state to melt the brazing material, and then cool and solidify each component to thereby form each part. The heat exchanger is completed by brazing and fixing the spaces together. At this time, due to the presence of the annular first rising portion 6 at the edge of the hole of the pair of entrances 1, an annular fillet 24 of brazing material is formed along the edge.
In FIG. 6, a shallow first flow path 22 is formed on the upper surface side of the first plate 3, and a deep second flow path 23 having a larger cross-sectional area than the first flow path 22 is formed on the lower surface side. The first fluid 9 flowing from one of the ports 1 flows through the first flow path 22 and flows out of the other port 1. Further, the second fluid 10 flowing from one of the ports 2 flows through the second flow path 23 and flows out of the other port 2.
[0015]
Here, as shown in FIGS. 7 and 6, the hole edge of the entrance 1 of the first plate 3 is formed with a second rising portion 7 having a high height at a corner, and the first rising portion 6 is lower than the first rising portion 6. The fluid 9 flows into and out of the shallow first flow path 22 as shown by the arrow in FIG. 6, so that the flow resistance at the edge of the hole is reduced.
The burring portion 2a of the entrance 2 may have a stepped edge similar to the entrance 1 of the first plate 3.
[0016]
Next, FIG. 8 shows a modified example of the second rising portion 7 in FIG. 7 of the present invention. In this example, a plurality of locking claws 5 are formed to project from the edge of the first rising portion 6. Things. The engagement claws 5 can reliably maintain the fitted state of the respective elements during assembly. At the same time, the height of the first rising portions 6 other than the locking claws 5 is low, so that the flow resistance of the fluid at the hole edge of the entrance 1 can be reduced. In addition, due to the presence of the first rising portion 6, an annular fillet 24 similar to the above is formed at the edge of the hole between the entrance 1 of the first plate 3 and the entrance 1 of the second plate 4 which are in contact with each other. You.
[0017]
[Action and Effect of the Invention]
In the plate heat exchanger of the present invention, a slight ring-shaped first rising portion 6 is formed on the entire periphery of the hole edge of the entrance 1 of the first plate 3 and the first rising portion 6 is formed. A second rising portion 7 that rises in a stepped shape from only a part thereof is integrally formed, and the height of the second rising portion 7 is sufficiently greater than the thickness of the second plate 4 and the first rising portion 6 and Since the second rising portion 7 is inserted into the entrance 1 of the second plate 4, the entrances 1 of the pair of first plate 3 and the second plate 4 can be surely aligned with each other, and the two can be joined together. Since the first rising portion 6 has a height lower than that of the second rising portion 7, the fluid flowing in and out of the first rising portion 6 can flow smoothly, and the fluid resistance can be reduced. Moreover, since the first rising portion 6 of the first plate 3 is fitted into and joined to the entrance 1 of the second plate 4, an annular fillet of a brazing material is formed at the edges of both holes, and the reliability of brazing is improved. It becomes high.
[0018]
In the above configuration, the entrances 1 and 2 are respectively provided at the corners of the rectangular plane, and the second rising portion 7 can be arranged to face the corner. Thereby, the fluid flowing in and out of each port 1 can be made to flow more smoothly.
[0019]
Further, in the plate type heat exchanger in which the first plates 3 and the second plates 4 are alternately stacked, a first rising portion 6 is formed at the edge of the hole of the entrance 1 of the first plate 3 and the first rising portion 6 is formed. A plurality of locking claws 5 having a height sufficiently exceeding the thickness of the second plate 4 are integrally formed only on a part of the rising portion 6, and the locking claws 5 are fitted into the entrance 1 of the second plate 4. In this case as well, the flow resistance at the edge of the hole of the fluid flowing in and out of the port 1 can be reduced.
[0020]
In any of the above configurations, a plurality of claws 8 are integrally formed on the periphery of one of the first plate 3 and the second plate 4, and the claws are bent to lock the edge of the other plate. can do. By doing so, it is possible to simplify the caulking portion, simplify the process, simplify the mold structure for press molding, and reduce the manufacturing cost.
[Brief description of the drawings]
FIG. 1 is a plan view of an element 20 of the plate heat exchanger of the present invention.
FIG. 2 is a sectional view taken along the line II of FIG. 1;
FIG. 3 is a sectional view taken along the line III-III in FIG. 1;
FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1;
FIG. 5 is an exploded perspective view of a main part of the element 20.
FIG. 6 is a sectional view of a main part of the heat exchanger in which a plurality of elements 20 are stacked.
FIG. 7 is a schematic perspective view of an edge of a hole at an entrance 1 of the first plate 3;
FIG. 8 is a schematic perspective view of an edge of a hole showing another embodiment.
[Explanation of symbols]
1, 2 entrance and exit 2a burring portion 2b opening 3 first plate 4 second plate 5 locking claw 6 first rising portion 7 second rising portion 8 claw portion 9 first fluid
10 Second fluid
11 dimples
12, 13 Small flange
14 Annular recess
18 Flat surface
20 elements
21 recess
22 First channel
23 Second channel
24 annular fillets

Claims (4)

A pair of first and second plates (3) and (2), each of which is formed with a pair of entrances (1) and (2), which are separated from each other, is opened, and at least one of its peripheral edges is raised. Have
The first plate (3) and the second plate (4) are alternately stacked, their peripheral edges are in contact with each other, the respective entrances (1), (2) are aligned in the stacking direction, and Are in contact with each other and their contact parts are brazed,
A small ring-shaped first rising portion (6) is formed all around the hole edge of the entrance (1) of the first plate (3), and a part of the first rising portion (6). Only the second rising part (7), which rises in a stepped shape, is formed integrally therewith,
The height of the second rising portion (7) exceeds the thickness of the second plate (4) sufficiently, and the first rising portion (6) and the second rising portion (7) are connected to the second plate (4). ) A plate-type heat exchanger inserted into the entrance (1). In claim 1,
The outer peripheries of the first plate (3) and the second plate (4) are formed in a rectangular shape, and the entrances (1) and (2) are arranged at respective corners,
A plate type heat exchanger wherein the second rising portion (7) is formed to face an adjacent corner thereof. A pair of first and second plates (3) and (2), each of which is formed with a pair of entrances (1) and (2), which are separated from each other, is opened, and at least one of its peripheral edges is raised. Have
The first plate (3) and the second plate (4) are alternately stacked, their peripheral edges are in contact with each other, the respective entrances (1), (2) are aligned in the stacking direction, and Are in contact with each other and their contact parts are brazed,
A slight ring-shaped first rising portion (6) is formed all around the hole edge of the entrance (1) of the first plate (3), and the first rising portion (6) is spaced apart from the first rising portion (6). Then, a plurality of locking claws (5) are launched together,
The height of the locking claw (5) to the tip of the second plate (4) is sufficiently greater than the thickness of the second plate (4). 4) A plate-type heat exchanger inserted into the entrance (1). In any one of claims 1 to 3,
A plurality of claws (8) are integrally formed on the periphery of one of the first plate (3) and the second plate (4), and the claws (8) are bent to form an edge of the other plate. A plate-type heat exchanger characterized by locking.

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