JPH10253281A - Manufacture of plate type heat exchanger and repairing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently manufacture and repair a laminated heat transfer plate block in which heat transfer medium flows without requiring an upgraded welding technology. SOLUTION: The method for manufacturing a plate type heat exchanger comprises the steps of welding edges of butted nozzle ports 34 of a pair of heat transfer plates 31 from inside at the pair of the plates 31 at a bottom of a recess 33 on a front surface and a peripheral edge and the recess 33 on a rear surface, assembling the plate pair 15, welding the peripheral edges of the plate 31 at the pair 15 from outside, assembling the pair container group, laminating them, and welding the plate 31 and the end heat transfer plate to end of the group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a plate type heat exchanger in which a heat transfer medium is circulated inside and outside a plurality of heat transfer plate containers to perform heat exchange between fluids flowing on the front and back of the heat transfer plate. Repair method.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG.
The top surface 2a of the plurality of recesses 2 and the nozzle holes 4 are formed on the surface thereof, and the peripheral portion 3 and the opening surface 2b of the recess 2
Then, as shown in FIG. 5B, the back surfaces of the heat transfer plates 1 and 1 are overlapped with each other, and the peripheral portions 3 and 3 are joined by welding from the outside to form a hollow. Then, as shown in FIG. 5C, the plurality of heat transfer plate containers 5 and 5 are stacked, and the edges of the nozzle holes 4 are welded to each other to assemble them. The plate container group 6 was formed.

In the case where a hole is formed in the heat transfer plate container 5, after specifying the location of the hole, the entire heat transfer plate container 6 having the hole is removed by cutting off the edge of the nozzle tube 4. The heat transfer plate container (group) 6 assembled in the same manner as described above was repaired by welding the nozzle hole 4.

[0004]

However, the welding of the peripheral portion 3 of the heat transfer plate 1 can be performed easily from the outer peripheral side in the above-mentioned assembling work, but the welding of the peripheral portion of the nozzle port 4 is easy. Since the bottom surfaces 2b of the concave portion 2 are close to each other,
It is necessary to perform from inside the nozzle port 4. Therefore, in the welding work of the edge portion of the nozzle port 4, many heat transfer plate containers 6
The more layers are stacked, the deeper the weld is, the worse the workability is, and there is a problem that a high level of welding technology is required.

[0005] The first aspect of the present invention solves the above problems and provides a method of manufacturing and repairing a plate-type heat exchanger which does not require advanced technology and has good workability. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a method of manufacturing a plate type heat exchanger, comprising a peripheral portion and a concave portion on a back side, and a bottom surface of the concave portion on a front side. A heat transfer plate having a plurality of heat transfer plates is formed by joining the surfaces of a pair of the heat transfer plates facing each other and welding the edges of the nozzle openings from the inside of the nozzle openings. The heat transfer plates of the hot plate pairs are overlapped on the back surfaces thereof and the peripheral portions are welded from the outside to assemble the heat transfer plate / container group. The back of the hot plate is overlapped and the peripheral edge is welded and attached,
The rear surface of the heat transfer plate is overlapped with the other end surface, and the peripheral edge is welded.

According to the above construction, first, the edges of the nozzle openings of the heat transfer plate are welded from the inside at a shallow position to form a heat transfer plate pair, and then the heat transfer plate pair of the heat transfer plate pair is formed. Are welded from the outside to form a heat transfer plate-to-vessel group, so that the welding work of the edge of the nozzle opening can always be performed at a shallow position. Therefore, it is possible to efficiently manufacture without requiring advanced welding technology.

According to a second aspect of the present invention, there is provided a method for repairing a plate type heat exchanger, wherein a peripheral portion and an opening surface of a concave portion are formed on a back surface side, and a bottom surface of a concave portion and a nozzle opening are formed on a front surface side. The plate, a hollow heat transfer plate container in which the back surfaces of a pair of the heat transfer plates are butted and the peripheral portions are joined, and the edge portions of the nozzle openings of the plurality of heat transfer plate containers are joined and laminated. When repairing the plate heat exchanger consisting of the heat transfer plate container group, the heat transfer plate container group in a predetermined range including the damaged portion is removed by cutting off the edges of the nozzle openings at both ends thereof, and then the removal is performed. The edge of the new heat transfer plate is brought into contact with the end face facing the part, and the edges of the nozzle port are welded and connected from the inside of the nozzle port, then the surfaces of the heat transfer plate are brought together and the edges of the nozzle port are brought together with the nozzle. Assemble the heat transfer plate pair by welding from the inside of the mouth, A heat transfer plate pair or a heat transfer plate pair container group in which the surfaces of the heat transfer plate pair are overlapped and welded to the periphery is inserted into the removed portion and overlapped on the back surface of the new heat transfer plate. Are welded and joined.

According to the above construction, the edge of the nozzle opening is cut to remove the heat transfer plate container group including the damaged portion, and then the nozzle opening is abutted to the cut portion and welded at a shallow position to form the new heat transfer plate. The heat transfer plate pair or the heat transfer plate pair container group is inserted into the removal portion, and the peripheral portion of the heat transfer plate is welded from the outer peripheral side and attached. The height can be reduced, and finally, the periphery of the heat transfer plate is welded and assembled, so that advanced welding technology is not required, and workability can be improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Here, the plate &
An embodiment of a method for manufacturing and repairing a shell-type heat exchanger will be described with reference to FIGS.

This plate & shell type heat exchanger is shown in FIG.
As shown in FIG. 1, a stacked heat transfer plate container group 12 in which a second heat transfer medium B is fed into a shell 11 into which a first heat transfer liquid A is sent is built. The shell 11 is formed in a cylindrical container shape with a cylindrical side wall 21, a bottom wall 22, and an openable / closable lid 23, and a heat medium inlet 24 and a heat medium outlet 25 are formed on the side wall 21. A heat transfer plate container group 12 is disposed at 23 via a nozzle pipe 14 for supplying and discharging the second heat medium liquid B.

The heat transfer plate container group 12 is shown in FIG.
As shown in (b), the heat transfer plate 31 having the peripheral edge portion 32, the plurality of concave portions 33, and the nozzle ports 34 is formed in the raw material plate P by press working. That is, of the front surface and the back surface which are planes parallel to each other, the peripheral portion 32 and the opening surface 33a of the recess 33 are formed on the back surface side, and the bottom surface 33b of the recess 33 and the nozzle port 34 are formed on the front surface side. The heat transfer plate containers 13 are formed by overlapping the back surfaces of the pair of heat transfer plates 31 and joining the peripheral portions 32, 32. The heat transfer plate container 13 is stacked so that the concave portions 33 are intersected as shown by, for example, a solid line and a wavy line in FIG. In addition, the second heat transfer fluid B is configured to flow from the nozzle port 34 to the hollow formed by the recess 33. Each heat transfer plate 31 except for the end heat transfer plate 31a
Is formed with a nozzle port 34 serving as an inlet and an outlet of the second heat transfer fluid B, and the edge of the nozzle port 34 is slightly protruded from the bottom surface 33 b of the recess 33, and the nozzle port 34 of the adjacent heat transfer plate container 13 is formed. And is welded. Further, the nozzle tube 14 penetrating the lid 23 is joined to the nozzle port 34 on the side of the lid 23 by welding.

Next, a method of manufacturing the heat transfer plate container group 12 in the plate & shell type heat exchanger will be described. 1. As shown in FIGS. 1A and 1B, first, a peripheral portion 32 and a concave portion 33 are formed from a material plate P by pressing.
Then, the heat transfer plate 31 having the nozzle port 34 is formed.

2. As shown in FIG. 1C, the surfaces of the pair of heat transfer plates 31 are abutted, and the edges of the nozzle openings 34 are welded from the inside to form the heat transfer plate pair 15. This welding work
Welding is performed from the inside of the nozzle port 34 through the inside, but since the depth is small, advanced technology is not required and can be easily performed, and workability is good.

3. As shown in FIG. 2A, the heat transfer plate pair 1
5 are laminated and joined to form a heat transfer plate pair container 16.
That is, the back surfaces of the heat transfer plates 31 of each heat transfer plate pair 15 are overlapped, the peripheral portion 32 is joined by welding from the outside, and the heat transfer plate pairs 15 are added to form the heat transfer plate pair container group 16. .

4. As shown in FIG. 2 (b), an end heat transfer plate 31a having no nozzle port 34 is overlapped on one end surface of the heat transfer plate pair container group 16 with the back surfaces thereof overlapped with each other to form a peripheral portion 3a.
2 are joined by welding from the outside. Further, on the other end side, the heat transfer plate 31 is overlapped with its back surface, and the peripheral edge portion 33 is welded and joined from the outside.
The nozzle pipe 14 is welded to the nozzle 4 and the nozzle pipe 14 is fitted into a through hole of the lid 23 and fixed by welding.

According to the above embodiment, first, the edges of the nozzle openings 34 are welded to form the heat transfer plate pairs 15, and then the back surfaces of the heat transfer plates 31 of the plurality of heat transfer plate pairs 15 are overlapped. Since the heat transfer plate-to-vessel group 16 is assembled by welding the peripheral portions 32 thereof, the joining of the nozzle port 34 that requires welding from the inside can be performed at a shallow position, and therefore, advanced welding technology is required. Workability is good.

Next, an embodiment of a method for repairing a group of heat transfer plates for a heat exchanger according to the present invention will be described with reference to FIG. In addition,
The same members as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

When a part of the heat transfer plate container group 12 is damaged and pierced, Take the heat transfer plate container group 12 out of the shell 11 and
Identify broken or punctured parts by air tightness tests.

2. Then, as shown in FIG. 4 (a), a heat transfer plate container group 13B including at least one heat transfer plate container 13 in which a broken portion and a hole are formed is moved to the edge of the nozzle port 36 by a wire cut saw or the like. The part is cut off at the cutting part C and removed.

3. As shown in FIG. 4B, a new heat transfer plate 31b is joined to the cut portion C by welding the edges of the nozzle port. This welding work is also performed from the inside of the nozzle port 34 through the inside. However, since the depth of the nozzle port 34 is shallow, advanced technology is not required and can be easily performed, and the workability is good.

4. As shown in FIG. 4B, the surfaces of the pair of heat transfer plates 31 are butted against each other, and the edges of the nozzle openings 34 are welded to form the heat transfer plate pair 15. This welding work also
It will be welded through the inside from the nozzle port 34,
Since the depth is short, it can be easily performed without the need for advanced technology, and the workability is good. Further, a plurality of heat transfer plate pairs 15 are welded to their peripheral edges 32 corresponding to the deleted heat transfer container group (excluding the heat transfer plates 31 at both ends) to form the heat transfer plate pair container group 16. This operation is not performed when the number of the heat transfer plate containers 13 in the deleted portion is two as shown in FIG.

5. As shown in FIG. 4C, the heat transfer plate pair 1
5 (or a heat transfer plate-container group) is arranged between the new heat transfer plates 31a, and the peripheral part 32 is joined by welding. In the case where the number of the heat transfer plate containers 13 in the deleted portion is one, the new heat transfer plate 3
1a may be joined by welding.

According to the above-described embodiment, first, the edge of the nozzle port 34 is welded to the cut portion to join the new heat transfer plate 31b, and then the heat transfer plate pair 1 in which the nozzle cylinders 36 are joined first.
5 (or the heat transfer plate pair container group 16) and
Is welded and joined, the welding of the nozzle port 34 that requires welding from the inside can be performed at a shallow position, so that the repair can be performed quickly without the need for advanced welding technology.

[0025]

As described above, according to the method for manufacturing a plate heat exchanger according to the first aspect of the present invention, first, the edges of the nozzle openings of the heat transfer plate are welded from the inside to transfer the heat. A pair of heat plates is formed, and then the periphery of the heat transfer plate of the pair of heat transfer plates is welded from the outside to form a group of heat transfer plate containers, and a stacked heat transfer plate container group is manufactured. The welding of the rim of the mouth can always be performed at a shallow position, it is extremely efficient and does not require advanced technology. Therefore, it is possible to efficiently manufacture without requiring advanced welding technology.

According to a second aspect of the present invention, there is provided a method for repairing a plate-type heat exchanger. After the edge of the nozzle opening is cut to remove the heat transfer plate container group including the damaged portion, the nozzle opening is cut into the cut portion. The new heat transfer plate is installed by butt welding, and the heat transfer plate pair or the heat transfer plate-to-vessel group is attached to the removed part by welding the peripheral edge of the heat transfer plate. Can be made shallower, and finally, the periphery of the heat transfer plate is welded and assembled, so that advanced welding techniques are not required, and workability can be improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a method for manufacturing a heat transfer plate group according to the present invention, and (a) to (c) are explanatory views showing procedures.

FIG. 2 shows an embodiment of a method of manufacturing the heat transfer plate group,
(A), (b) is explanatory drawing which shows a procedure, respectively.

FIG. 3 is an exploded view of a plate & shell type heat exchanger incorporating the heat transfer plate group.

FIGS. 4A to 4C are exploded views illustrating a method of repairing the heat transfer plate group.

FIGS. 5A to 5C are explanatory views of a conventional method for manufacturing a heat transfer plate container group.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Shell 12 Heat transfer plate container group 13 Heat transfer plate container 14 Nozzle port 15 Heat transfer plate pair 16 Heat transfer plate pair container group 31 Heat transfer plate 31a End heat transfer plate 31b End heat transfer plate 32 Peripheral part 33 Side part Wall 33a Opening surface 33b Bottom 34 Nozzle port

Claims (2)

[Claims] 1. A heat transfer plate having a peripheral portion and a concave portion on a back surface side and a bottom surface of a concave portion on a front surface side, and the surfaces of a pair of said heat transfer plates are opposed to each other and abutted against each other to form an edge of a nozzle opening. Heat transfer plates are assembled from the inside of the nozzle opening to assemble a heat transfer plate pair, the heat transfer plate pairs of multiple heat transfer plate pairs are overlapped on the back surface, and the periphery is welded from the outside to assemble the heat transfer plate pair container group Then, on one end surface of the heat transfer plate paired with the container group, the back surface of the end portion heat transfer plate having no nozzle opening is overlapped and the peripheral edge is welded and attached, and the back surface of the heat transfer plate is overlapped on the other end surface. A method for producing a plate heat exchanger, comprising: 2. A heat transfer plate having a peripheral edge portion and an opening surface of a concave portion formed on the back surface side and a bottom surface of the concave portion and a nozzle opening formed on the front surface side, and a back surface of a pair of the heat transfer plates is abutted. A plate-type heat exchanger consisting of a hollow heat transfer plate container with peripheral portions joined together and a heat transfer plate container group in which the edge portions of the nozzle openings of these multiple heat transfer plate containers are joined and stacked. At the time of repair, after removing the heat transfer plate container group within a predetermined range including the damaged part by cutting off the edges of the nozzle openings at both ends, the surface of the new heat transfer plate is brought into contact with the end face facing this removed part The edges of the nozzle port are welded and connected from the inside of the nozzle port, then the surfaces of the heat transfer plate are butted together, and the edges of the nozzle port are welded from the inside of the nozzle port to assemble a heat transfer plate pair. The heat transfer plate pair or the surface of the heat transfer plate pair Repairing a plate-type heat exchanger, wherein a heat transfer plate-to-vessel group with welded portions is inserted into the removed portion, overlapped on the back surface of the new heat transfer plate, and their peripheral edges are welded and joined. Method.