JP2000310497A - Cut plate type heat exchanger for high temperature gas and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrosion resistance and a heat resistance and minimize the use of a brazing material as much as possible by forming a flat gas passage inside the plane of an annular aqueduct between elements and causing the flat gas passage to communicate with a pair of gas communicating holes. SOLUTION: In a cup plate type heat exchanger, a pair of first plate 1 and second plate 2 form an element 3. Each of the plates 1 and 2 has a substantially square peripheral wall on a plane and is provided with a narrow brazing flange part 4 on its entire peripheral edge, and a pair of water communicating hole 5 and gas communicating hole 6 formed toward a central side with a prescribed distance from the peripheral wall at each of diagonal corner parts. Then, the second plate 2 is provided with a a groove shaped annular aqueduct 7 square on a place and flat on a bottom which is adjacent to the flange part 4, and a flat aqueduct 9 communicates with the annular aqueduct 7. Then, a plurality of elements 3 are laminated to form a flat gas passage 10 inside the plane of the annular aqueduct 7 between the elements 3. A pair of gas communicating holes 6 communicate with the passage 10. Thus, the high temperature corrosion of the plates and the brazing part and the destruction of a base metal due to a thermal stress or the like can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas heat exchanger for cooling a high-temperature exhaust gas or the like having a highly corrosive substance, in which a number of cup-shaped plates are stacked.

[0002]

2. Description of the Related Art If strongly acidic substances such as H ₂ O and sulfur oxides are present in the components, such as exhaust gas generated by the combustion of fossil fuels, acidic condensed water is generated by the cooling of the substances, and ordinary condensed water is generated. In a cup plate type heat exchanger made of stainless steel, there is a risk of dissolving Cu, which is the brazing material. Therefore, in a water-cooled exhaust gas heat exchanger such as an EGR cooler, a Ni brazing material having much higher corrosion resistance than a Cu brazing material is used. As the Ni brazing material, a powdered material or an ultra-thin amorphous brazing material is known.
However, the nickel-based amorphous brazing material does not yet have a technology for cladding a stainless steel base material. Also, due to the high hardness of the amorphous brazing material, it is not possible to draw with a mold. The use of a powdered Ni brazing material has the disadvantage of poor workability. Furthermore, amorphous brazing materials have the disadvantage of being very expensive. Also, in the conventional cup plate type heat exchanger, since cooling water does not flow around the periphery of the hole of the communication hole serving as an exhaust gas inlet / outlet, high temperature corrosion and high temperature oxidation and heat stress of the stainless steel base material occur in that portion. There was a risk of partial destruction and the like.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cup-plate type heat exchanger for water-cooled high-temperature gas, which has corrosion resistance and heat resistance and can minimize the use of a nickel-based amorphous brazing material, and its production. The task is to provide a method.

[0004]

According to the present invention, a pair of first and second plates 1 and 2 each having a dish shape are provided.
Are overlapped in opposite directions to form an element 3, each of the plates 1 and 2 has a substantially planar rectangular peripheral wall, and a narrow flange portion 4 for brazing is provided on the entire peripheral edge thereof. A pair of water communication holes 5 and gas communication holes 6 are formed at the corners at the diagonal positions and located on the center side at a predetermined distance from the peripheral wall, and at least one plate has a hole formed in each of the gas communication holes 6. The edge 6a is raised to the dish-like inner surface side, and the second plate 2 has a flat rectangular-shaped groove-shaped annular channel 7 adjacent to the flange 4 and recessed toward the dish-like bottom face. The gas communication hole 6 is formed at a corner portion of the plane closer to the center than the annular water channel 7, a plurality of the elements 3 are stacked, and the space between the respective elements 3 is located at the center side of the annular water channel 7 on the plane. The inner fin 8 is interposed and the element A flat water passage 9 is formed in the inside 3, and the annular water passage 7 extends around the outer periphery of the flat water passage 9, and a pair of the water communication holes 5 communicates therewith. A high-temperature gas cup plate type heat exchanger in which a flat gas passage 10 is formed in the flat gas passage 10 and the gas communication holes 6 communicate with the flat gas passage 10.

According to a second aspect of the present invention, in the first aspect, at least one of the first plate 1 and the second plate 2 is formed with a plurality of bent dimples 11 for a spacer that is convex on the inner surface side. And the first plate 1
A high-temperature gas cup plate heat exchanger in which a brazing inner flange portion 6b is formed on a hole edge 6a of at least one of the gas communication holes 6 of the first and second plates 2. According to a third aspect of the present invention, in the first or second aspect, an edge portion 4a for caulking is formed on an edge of one of the flange portions 4 of the first plate 1 and the second plate 2,
This is a cup plate type heat exchanger for high-temperature gas which is bent so that both plates 1 and 2 are in close contact with each other. The present invention described in claim 4 is the first to third aspects of the present invention.
In any one of the above, a plurality of elements 3 are stacked,
A pair of end plates 16 and 17 are arranged at both ends in the laminating direction, and only the flat water passage 9 and the annular water passage 7 are arranged adjacent to the end plates 16 and 17 so that the flat gas passage 10 is not adjacent. Cup plate type heat exchanger for high temperature gas.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a cup plate type heat exchanger for hot gas according to the second aspect, wherein the inner surface of the first plate 1 and the second surface are provided in each element 3. A frame-shaped solder made of a nickel-based amorphous brazing foil having an outer edge substantially aligned with the edge of the flange portion 4 between the inner surfaces of the plate 2 and a punched portion opened at an intermediate portion to match the size of the inner fin 8. A material 12 is interposed between each element 3, between the outer surface of the second plate 2 and one surface of the inner fin 8, a nickel-based amorphous material matching the punching opening 13 of the frame brazing material 12. A small rectangular brazing material 14 made of brazing foil is interposed, and an outer edge of the annular water passage 7 is formed between the other surface of the inner fin 8 and the outer peripheral portion of the second plate 2 and the outer surface of the first plate 1. Abbreviated on the outer edge A rectangular brazing material 15 made of a nickel-based amorphous brazing foil is interposed, and a powdered nickel-based brazing material is applied to an end face of the dimple 11 in the element 3 via a binder to form a cup plate for high-temperature gas. An assembly process for assembling a mold heat exchanger, and inserting the assembly into a furnace to melt each brazing material, and then cooling and solidifying it, thereby brazing and fixing each component integrally and liquid-tightly And a step of producing a cup plate heat exchanger for high temperature gas.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of an essential part of a cup plate type heat exchanger for hot gas of the present invention, and FIG.
FIG. 3 is a partially exploded explanatory view in a longitudinal central section. 3 shows an assembled state in FIG. 2, and FIG. 4 is a schematic cross-sectional view seen from the left side in FIG. FIG. 5 is a partially cutaway perspective view of the cup plate heat exchanger for hot gas of the present invention. In this cup plate type heat exchanger, a pair of dish-shaped first and second plates 1 and 2 are overlapped in opposite directions to form an element 3. Each of the plates 1 and 2 has a peripheral wall slightly raised in a substantially planar rectangular shape, and a narrow flange portion 4 for brazing is protruded from the entire peripheral edge thereof in the planar direction. Also,
At the edge of the flange portion 4 of the second plate 2, an edge 4a for caulking is provided in a protruding manner.

A pair of water communication holes 5 and gas communication holes 6 are formed at the corners of the diagonal positions of the plates 1 and 2 at a predetermined distance from the peripheral wall. Further, a hole edge 6a of the gas communication hole 6 of the first plate 1 is raised on the dish-shaped inner surface side. Next, the second plate 2
A grooved annular water channel 7 having a flat rectangular shape and a flat bottom surface is formed adjacent to the caulking edge 4a on the dish-shaped bottom surface side. Is formed with a gas communication hole 6. The gas communication hole 6
A protruding edge 22 is formed in a burring shape at an edge portion of the light emitting element. Such plates 1 and 2 are overlapped to form an element 3
Is formed, the flat water channel 9 is present therein, and the annular water channel 7 is extended around the flat water channel 9. In this example, a large number of dimples 11 projecting inward from the inner surface of the plate 1 are distributed and bent to form a spacer. The peripheral portion of the water communication hole 5 of the second plate 2 is recessed at the same depth as the annular channel 7 on the bottom surface side of the second plate 2. Then, when the first plate 1 and the second plate 2 are overlapped, the hole edges of the respective gas communication holes 6 come into close contact with each other. The outer peripheral edge of the water communication hole 5 on the outer surface side of the plates 1 and 2 is in close contact with the outer peripheral edge of the water communication hole 5 on the outer surface of the adjacent element.

Next, an element 3 is constituted by a pair of plates 1 and 2, and a plurality of elements 3 are stacked via an inner fin 8, and as shown in FIGS. 2 and 3, the lower surface of the annular channel 7 of the second plate 2 is formed. Is seated on the upper surface of the first plate 1. A flat gas passage 10 is formed at a position surrounded by the annular water passage 7 therebetween, and the inner fin 8 is disposed in the flat gas passage 10. End plates 16 and 17 are provided at both upper and lower ends in the stacking direction. As shown in FIG. 1, the upper end plate 16 has a water communication hole 5 formed at one end on one side in the width direction, and one end of a water pipe 19 is connected thereto. A gas communication hole 6 is provided on the other end of the end plate 16 in the longitudinal direction, and a connection boss 18 is disposed therein.
A gas communication hole 6 is formed at the other end of the lower end plate 17 in the width direction at one end corner in the longitudinal direction, and a water communication hole 5 is formed at the other end corner. The connection boss 18 and the water pipe 19 are connected to the water communication hole 5.

[0010]

[Assembly method] At the joint of each part thus formed,
A brazing material made of a nickel-based amorphous brazing foil is interposed. At the same time, a powdery nickel-based brazing material is applied to the top surface of the dimple 11 of the first plate via a binder. Therefore, first, the outer periphery of the frame-shaped brazing material 12 inserted between the first plate 1 and the second plate 2 is aligned with the outer periphery of the flange portion 4, and the opening 13 is punched inside. Further, holes are formed at both ends in the longitudinal direction so as to align with the pair of water communication holes 5 and gas communication holes 6. In addition, the rectangular brazing material 15 inserted between the outer surface of the second plate 2 and the outer surface of the first plate 1 has an outer peripheral edge substantially aligned with the outer periphery of the plates 1 and 2 and a pair of brazing members 15 at both ends in the longitudinal direction. The water communication hole 5 and the gas communication hole 6 are formed.

The outer surface of the first plate 1 and the end plate
The square brazing material 15 arranged between the inner surface of the plate 16 is the same as that arranged between the outer surface of the second plate 2 and the outer surface of the first plate 1. The frame brazing material 12 interposed between the first plate 1 and the lower end plate 17 is the same as that interposed between the first plate 1 and the second plate 2. Next, the small brazing material 14 interposed between the outer surface of the second plate 2 and the inner fin 8 is a frame-shaped brazing material.
What was generated at the time of punching the opening 13 of 12 is used. In addition, connection boss 18, water pipe 19 and end plate 16,
17, a powdery or ring-shaped nickel-based brazing material (not shown) is interposed. In the case where the first plate 1 and the second plate 2 are overlapped with the frame-shaped brazing material 12, the caulking edge 4a of the second plate 2 is folded inward, so that the peripheral edges of both of them are formed. Be adhered. Then, in a state where the whole is assembled, it is inserted into a high-temperature furnace to melt the brazing material, and then cooled and solidified to liquid-tightly braze and fix the components, thereby obtaining the cup plate type heat exchange of the present invention. Complete the vessel.

For example, in FIG. 1, the inlet side of the exhaust gas pipe is connected to the gas communication hole 6 of the uppermost connection boss 18, and the exhaust gas outlet side is connected to the lowermost connection boss 18. The inlet of the cooling water is connected to the lowermost water pipe 19, and the outlet of the cooling water pipe is connected to the uppermost water pipe 19. Cooling water flows between the flat water channel 9 and the annular water channel 7 from one water communication hole 5 to the other water communication hole 5, and exhaust gas flows from one gas communication hole 6 to the other gas communication hole 6. It circulates through the path 10 and the inner fin 8 inserted therein. Heat is exchanged between the two.

[0013]

[Modifications] The present invention is not limited to the above-described embodiment. For example, the second plate 2 can be kept flat without providing a caulking portion at the end of the flange portion 4 of the second plate 2. It is. In the above-described embodiment, the opening 13 is provided in the frame-shaped brazing material 12. However, the opening 13 may not be provided.

[0014]

According to the first aspect of the present invention, a rectangular annular water passage 7 is formed adjacent to the brazing flange portion 4, and a flat water passage 9 is provided on the inner side in the plane direction. Have been. Since the entire periphery of the gas communication hole 6 and the flat gas passage 10 are surrounded by the annular water passage 7 and the flat water passage 9, high-temperature corrosion of the plate and the brazing portion can be prevented. At the same time, destruction of each part due to high-temperature oxidation, sensitization, and thermal stress of the base material can be prevented.

According to the second aspect of the present invention, since at least one of the first plate 1 and the second plate 2 is formed with the dimple 11 for the spacer in a bent shape, the cup plate for a high-temperature gas with high pressure resistance is provided. Type heat exchanger. According to the third aspect of the present invention, since the crimping edge portion 4a is formed at the edge of the flange portion 4 and is bent so that the plates 1 and 2 are in close contact with each other, it is easy to assemble and braze. Reliability can be improved. The invention according to claim 4 is characterized in that end plates 1 are provided at both ends of the element in the stacking direction.
6 and 17 are arranged, and only the annular channel 7 and the flat channel 9 are arranged adjacent thereto. In addition, since the flat gas passage 10 is configured so as not to be adjacent to them, it is possible to provide a safe one that does not cause a burn even when a person touches the outer periphery of the heat exchanger.

According to a fifth aspect of the present invention, the brazing between the plates is reliably performed by using a nickel-based amorphous brazing foil, and an opening 13 is punched and formed in the frame brazing material 12, and the opening is formed. Since the inner fin 8 and the second plate 2 are joined by using the small square brazing material 14 matching the punching of the part 13, the particularly expensive nickel-based amorphous brazing material is effectively used. Waste can be eliminated. Further, since the brazing portions of the first plates 1 and 2 are formed by the flange portion 4 and the bottom surface of the annular water channel 7 is formed flat, even if a nickel-based amorphous brazing material having relatively low fluidity is used. Each brazing surface can be securely brazed and fixed in a liquid-tight manner. Thus, it is possible to provide a high-temperature cup-plate heat exchanger with high heat resistance and high reliability.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a cup plate heat exchanger for high-temperature gas of the present invention.

FIG. 2 is a partially exploded explanatory view in a longitudinal central section of the heat exchanger of the present invention.

FIG. 3 is an assembled state diagram of the heat exchanger in FIG. 2;

FIG. 4 is a schematic cross-sectional view of the heat exchanger of FIG. 5 as viewed from the left side.

FIG. 5 is a partially cutaway perspective view of the cup plate heat exchanger for high-temperature gas of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st plate 2 2nd plate 3 Element 4 Flange part 4a Edge for caulking 5 Water communication hole 6 Gas communication hole 6a Hole edge 6b Inner flange part 7 Annular water channel 8 Inner fin 9 Flat water channel 10 Flat gas channel 11 Dimple 12 Frame brazing material 13 Opening 14 Small rectangular brazing material 15 Square brazing material 16 End plate 17 End plate 18 Connection boss 19 Water pipe 20 Bracket 21 Caulked portion 22 Projecting edge

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Fumio Suzuki Inventor F-term in Toyo Radiator Co., Ltd. 3-25-3 Yoyogi, Shibuya-ku, Tokyo 3L103 AA01 AA08 AA12 AA27 AA43 BB02 BB17 CC27 DD15 DD54 DD55 DD57 DD58

Claims (5)

[Claims] 1. A pair of first and second plates 1 and 2 each having a dish shape.
The plate 2 and the plate 2 are overlapped in the opposite direction to form an element 3. Each of the plates 1 and 2 has a substantially planar rectangular peripheral wall, and a narrow flange portion 4 for brazing is provided on the entire periphery. ,
A pair of water communication holes 5 and a gas communication hole 6 are formed at the corners of the diagonal positions and located on the center side of the predetermined distance from the peripheral wall, and at least one plate is provided with at least one of the gas communication holes 6. The hole edge 6a is raised to the dish-like inner surface side, and the second plate 2 is adjacent to the flange portion 4 and has a flat rectangular groove-like annular water channel 7 with a flat bottom face on the dish-like bottom face side. The gas communication hole 6 is formed at a corner of the plane closer to the center than the annular water channel 7 in the plane, a plurality of the elements 3 are stacked, and the center side of the annular water path 7 in the plane between the respective elements 3. An inner fin 8 is interposed, and a flat channel 9 is formed in the element 3.
The annular water channel 7 extends around the outer periphery thereof, and a pair of the water communication holes 5 communicate with them. A flat gas channel 10 is formed between the elements 3 inside the plane of the annular water channel 7, and A cup plate type heat exchanger for high temperature gas, wherein a pair of the gas communication holes 6 communicate with the flat gas passage 10. 2. The spacer according to claim 1, wherein at least one of the first plate 1 and the second plate 2 is formed with a plurality of bent portions 11 for spacers that are convex on the inner surface side. 1st and 2nd
A cup plate type heat exchanger for high temperature gas, wherein a brazing inner flange portion 6b is formed at a hole edge 6a of at least one of the gas communication holes 6 with the plate 2. 3. The crimping edge 4a is formed at an edge of one of the flanges 4 of the first plate 1 and the second plate 2 according to claim 1 or 2, and is bent. A cup plate type heat exchanger for high temperature gas configured so that the two plates 1 and 2 are in close contact with each other. 4. The device according to claim 1, wherein a plurality of elements 3 are stacked, and a pair of end plates 16 and 17 are disposed at both ends in the stacking direction.
A high-temperature gas cup plate type heat exchanger in which only the flat water channel 9 and the annular water channel 7 are arranged adjacent to 6, 17 and the flat gas channel 10 is not adjacent. 5. The method for manufacturing a cup plate type heat exchanger for hot gas according to claim 2, wherein each element 3 has an inner surface between the inner surface of the first plate 1 and an inner surface of the second plate 2. A frame-shaped brazing material 12 made of a nickel-based amorphous brazing foil having an outer edge substantially aligned with the edge of the flange portion 4 and having a punched portion opened at an intermediate portion in accordance with the size of the inner fin 8 is interposed. Between the elements 3, between the outer surface of the second plate 2 and one surface of the inner fin 8, the frame-shaped brazing material 12 is provided.
A small square brazing material 14 made of nickel-based amorphous brazing foil matching with the punching opening 13 is interposed, and the other surface of the inner fin 8 and the outer peripheral surface of the second plate 2 and the outer surface of the first plate 1 A rectangular brazing material 15 made of a nickel-based amorphous brazing foil whose outer edge substantially matches the outer edge of the annular water channel 7 is interposed therebetween, and the end face of the dimple 11 in the element 3 is powdered through a binder. An assembling process of applying a nickel-based brazing material to assemble a cup plate type heat exchanger for high-temperature gas, and inserting the assembly into a furnace to melt each brazing material, and then cool and solidify the brazing material to form a heat exchanger. A method of manufacturing a cup plate type heat exchanger for high-temperature gas, comprising: a step of integrally and liquid-tight brazing and fixing parts.