JP2001099582A - Plate type heat exchanger and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate type heat exchanger capable of suppressing a facility cost to manufacture by easily working. SOLUTION: In the plate type heat exchanger, two tray-like plates 3 are superposed, and welded at their peripheral edges. Then, peripheral edges of adjacent communicating holes 6, 8 are welded to form one elements 41, 42, and 43. These elements 41, 42 and 43 are superposed and welded at their peripheral edges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a plate heat exchanger in which a plurality of dish-shaped plates are stacked and two fluid channels are alternately formed between the plates.

[0002]

2. Description of the Related Art In general, a plate-type heat exchanger is known in which a plurality of dish-shaped plates are vertically stacked and two fluid passages are alternately formed between the plates.

[0003] In this type, generally, the fluid flowing through the two fluid flow paths does not leak to the outside, the fluids do not mix inside, the heat exchange performance is excellent, and the initial cost is low. Is required.

[0004] In the conventional plate type heat exchanger, various types of heat exchangers have been proposed, such as a structure in which a gasket is sandwiched between the plates, a structure in which the plates are brazed, and a structure in which the plates are welded. Have been.

[0005] Also, in the method, corrugated (herringbone) irregularities are formed on the bottom of each plate by press molding, the irregularities are positioned between the plates, and the irregularities are projected into the flow path to generate turbulent flow. Increases heat exchange efficiency.

[0006] The corrugated shape is formed by inserting a special plate material into a precision mold and drawing by a press machine.

[0007]

However, when the heat exchanger having the above structure is used in, for example, an absorption refrigerator, it cannot be used in a vacuum, or the heat exchanger of the absorption refrigerator becomes large. Therefore, the size of the plate is increased, the size of the mold is increased, and thus the equipment and processing costs are increased, and the initial cost is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plate type heat exchanger which solves the above-mentioned problems of the prior art, is easy to process, and can reduce equipment costs in manufacturing. .

[0009]

According to the first aspect of the present invention,
Two dish-shaped plates are superimposed and their peripheral edges are welded together, and the peripheral edges of adjacent communication holes are welded together to form one element, and these elements are superimposed and the peripheral edges are superimposed. It is characterized by welding each other.

According to a second aspect of the present invention, two dish-shaped plates are overlapped and their peripheral edges are welded together, and the peripheral edges of adjacent communication holes are welded together to form one element. The elements are overlapped and housed in a box-shaped outer box, and a peripheral portion of a plate constituting an outermost element is formed by welding to an inner wall of the outer box. is there.

According to a third aspect of the present invention, two dish-shaped plates are overlapped and their peripheral edges are welded together, and the peripheral edges of adjacent communication holes are welded together to form one element. These elements are stacked and housed in an outer box having a bottomed box shape, and a peripheral portion of a plate constituting an outermost element is welded to an inner wall of the outer box. Things.

According to a fourth aspect of the present invention, two dish-shaped plates are overlapped and their peripheral edges are welded together, and the peripheral edges of adjacent communication holes are welded together to form one element. These elements are overlapped, and their peripheral edges are sequentially welded and assembled.

According to a fifth aspect of the present invention, two dish-shaped plates are overlapped and their peripheral edges are welded together, and the peripheral edges of adjacent communication holes are welded together to form one element. These elements are superposed on each other, housed in a box-shaped outer box, and assembled by welding a peripheral portion of a plate constituting an outermost element to an inner wall of the outer box. .

According to a sixth aspect of the present invention, one dish is formed by superposing two dish-shaped plates and welding the peripheral edges thereof, and welding the peripheral edges of adjacent communication holes. And stacking these elements in an outer box having a bottomed cylindrical shape, and assembling by welding a peripheral portion of a plate constituting an outermost element to an inner wall of the outer box. It is.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a relatively large plate heat exchanger suitable for use in, for example, an absorption refrigerator.

As shown in FIG. 2, the plate type heat exchanger 1 has a plurality of SPCC-shaped plates (for example, thickness t = 0.5 mm) 3 which are superposed on each other, and a turbulent flow A bottom plate 4 made of SPCC is disposed at the lowermost portion, and these are integrally joined by welding, and two fluid flow paths are alternately arranged above and below each plate 3. Formed.

The fluid of the first system enters through the inlet pipe 11, flows through the heat exchanger 1 through one of the alternately provided fluid flow paths, and is discharged from the outlet pipe 12. Further, the fluid of the second system enters from the inlet pipe 13, flows through the heat exchanger 1 through the other alternately provided fluid flow path, and is discharged from the outlet pipe 14. During this time, heat exchange is performed between the fluid of the first system and the fluid of the second system.

When this plate heat exchanger 1 is used for an absorption refrigerator, one is a concentrated liquid and the other is a diluted liquid. The pressure difference between the two is small.

Next, the manufacturing procedure of the plate heat exchanger 1 will be described.

FIG. 3 is a sectional view taken along the line III-III of FIG. As shown in FIG. 3, the plate heat exchanger 1 is configured by stacking five plates 3A to 3E and one bottom plate 4. As shown in FIGS. 4A, 4B, and 4C, two dish-shaped plates (3A and 3B, 3C and 3D, 3E and the bottom plate 4) are overlapped with each other, and their peripheral edges are welded together. Then, the peripheral portions of the adjacent communication holes 6 and 8 are welded to each other to form the respective elements 41 to 43, and then the respective elements 41 to 43 are sequentially superimposed in the direction of the arrow, as shown in FIG. The peripheral edges of the elements 41 to 43 are sequentially welded. In this case, it is manufactured by superimposing the elements 41 to 43 on the outlet pipe 14 and the inlet pipe 11 and welding them sequentially. The inlet pipe 11 communicates with the communication hole 6, and the outlet pipe 14 communicates with the communication hole 8.

The production procedure will be described in more detail.
A to 3E stand on both side edges in the longitudinal direction, respectively.
a, 3b, a bottom surface having a flat surface 3c that is uniformly continuous, and further, as shown in FIG. 2, communication holes 6 to 9 at four corners.

Referring to FIG. 4A, an annular recess 6a is formed by burring around one of the communication holes 6 of the lowermost plate 3A constituting the element 41, and the communication hole 6 is opened at the bottom thereof. The other communication hole 8 is opened directly on the flat surface 3c without burring, and an annular recess 8a is formed by burring around the other communication hole 8 of the plate 3B. 8 are open, and one of the communication holes 6 has a flat surface 3 without burring.
It opens directly to c.

The peripheral edges of the plates 3A and 3B are seam-welded 21, and the peripheral edges of the adjacent communication holes 6 are TIG-welded 22. Thus, one element 41 is formed. In this case, as shown in FIG. 5, the rising walls 3a, 3b of the plate 3B, which are superimposed thereon, are configured to extend a predetermined length L above the rising walls 3a, 3b of the plate 3A.

In this embodiment, a procedure similar to the above is used.
As shown in FIG. 4B, the peripheral portions of the plates 3C and 3D are seam-welded 23, and the peripheral portions of the adjacent communication holes 6 are TIG-welded 24 to form another element 42, and this another element 42 is formed. 42 is the element 4
Superimposed on one.

Then, the periphery of the plate 3B constituting each of the elements 41 and 42 and the periphery of the plate 3C are TIG welded 25 (FIG. 3).

In this case, as shown in FIG.
Since the rising walls 3a and 3b of B extend upward by a predetermined length L, it is easy to weld this extended portion to the rising walls 3a and 3b of the plate 3C.

In the same procedure, as shown in FIG. 4C, the peripheral edges of the plate 3E and the bottom plate 4 are seam-welded together.
At the same time, the periphery of the communication hole 6 and the bottom plate 4 are TIG-welded 27 to form another element 43, and this element 43 is superimposed on the two elements 41 and 42 already joined.

Then, the periphery of the plate 3C constituting each of the elements 42 and 43 and the periphery of the plate 3D are TIG welded 28 (FIG. 3).

Also in this case, as described above, the plate 3C
Since the rising walls 3a and 3b of the plate 3D extend upward by a predetermined length L, it is easy to weld this extended portion to the rising walls 3a and 3b of the plate 3D.

In this embodiment, each of the elements 41 to 4
In the case of manufacturing 3, since the side edges of the plate 3 and the bottom plate 4 can be seam-welded, the welding operation is easy and the welding without leakage can be performed within a short time.

In this plate heat exchanger 1, the first
The fluid of the system enters through the inlet pipe 11 and enters the region A in FIG.
2 flows in the heat exchanger 1 in the longitudinal direction through one of the fluid passages provided alternately on the upper and lower sides of the plate.
Is discharged from Further, the fluid of the second system enters through the inlet pipe 13 in FIG. 2 and flows in the heat exchanger 1 in the longitudinal direction through the region B (the other fluid flow path provided alternately above and below the plate) in FIG. Are discharged from the outlet pipe 14 of FIG. During this time, heat exchange is performed between the fluid of the first system and the fluid of the second system.

Although not shown in FIG. 3, a shielding member 5 is interposed between the plates 3.
Extends in each fluid flow path (regions A and B), keeps the dimensions between the plates 3 substantially uniform, and generates turbulence. As shown in FIG. 2, the shielding member 5 is configured by arranging a plurality of round bars 31 at right angles and welding intersections of the round bars 31. The shielding member 5 is disposed between the plates, but is preferably spot-welded to the flat surface 3c of the plate 3, for example.

The plate 3 of each round bar 31
It is desirable to form the contact surface with flat. According to these configurations, since the shielding member 5 is formed by arranging the round bar members 31 at right angles, the structure is extremely simple.

The plate 3 of each round bar 31
Since the contact surface with the contact is formed flat, the contact area increases, and the heat transfer efficiency is improved.

In this embodiment, the plate 3 is manufactured by performing a dish-like process, a burring process, and a through-hole process, and these processes can be performed by pressing at one time. Since there is no need to form a herringbone, a precision mold for corrugating is not required, machining precision is not required, and even if the plate heat exchanger 1 is enlarged, only the mold is enlarged. Therefore, an increase in equipment costs can be suppressed, and manufacturing costs can be reduced.

Further, since the gasket is not used as in the related art, the gasket can withstand use in a vacuum like an absorption refrigerator.

FIGS. 6 and 7 show another embodiment.

This plate type heat exchanger is constructed by superimposing five plates 3A to 3E and one bottom plate 4 and storing them in a box-shaped outer box 51.

As for the manufacturing procedure, as in the above-described embodiment, two dish-shaped plates (3A and 3B, 3C and 3D, 3E and the bottom plate 4) are overlapped, and their peripheral edges are welded together. The peripheral edges of the communication holes 6 and 8 are welded to each other to form the elements 41 to 43. Next, as shown in FIG. 7, the elements 41 to 43 are superimposed and stored in the outer box 51 in order. In this case, it is desirable that the periphery of each of the elements 41 to 43 (the plates 3B, 3D and the bottom plate 4) be sequentially TIG-welded 35 to the inner wall of the outer box 51.

However, what is important is that the outer case 51 is shaped like a box tube.
Are welded to the inner wall of the outer box 51, the elements 41 and 43 located at the openings at both ends of the outer case 51, that is, the peripheral edges of the plates constituting the outermost elements 41 and 43.

In this case, considering the ease of welding, the plates (3A, 3B,
It is desirable to weld the peripheral edge of the plate 3B and the peripheral edge of the bottom plate 4 among the peripheral edges of the base plate 3E and the bottom plate 4).

In this embodiment, workability is improved because the number of welding points is reduced, and the strength of the heat exchanger is increased because the outer case 51 is used.

FIG. 8 shows another embodiment.

In this embodiment, the outer box 53 has a bottom. The bottom plate 53a of the outer box 53 has the outlet tube 1 described above.
4 and an inlet pipe 11 are attached. Other configurations are substantially the same as those shown in FIG. 7, but in this case, only the periphery of the element 43, that is, the periphery of the plate constituting the outermost element 43, is TIG welding 36 is performed on the inner wall.

In this configuration, a space (for example, space C) formed between each of the elements 41 to 43 and the outer case 53 communicates with the inlet pipe 11.

In this embodiment, the workability is improved because the number of welding points is further reduced, and the strength of the heat exchanger is increased because the bottomed outer box 53 is used.

FIG. 9 shows another embodiment.

This embodiment is characterized in the structure of welding of the outlet pipe 14, the inlet pipe 11, and the like. Plate 3A
The communication holes 6, 8 of the plate 3B and the communication hole 6 of the plate 3B are burred with diameters substantially equal to the outer diameters of the outlet pipe 14 and the inlet pipe 11, and a collar 71 is integrally formed on the periphery of the communication hole. Have been.

The collar 71 is TIG-welded with its inner periphery in contact with the outer periphery of the outlet pipe 14, the inlet pipe 11, and the like. According to this, welding of the outlet pipe 14, the inlet pipe 11, and the like is facilitated, and liquid leakage can be prevented.

The present invention has been described based on one embodiment, but the present invention is not limited to this. For example, the outer boxes 51 and 53 are not limited to those described above, and the form can be arbitrarily changed. The welding may be of any welding type, and is not limited to the above-mentioned type.

[0052]

According to the present invention, there is provided a plate-type heat exchanger which can be easily processed and can reduce the equipment cost in manufacturing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a plate heat exchanger according to the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is an exploded view of FIG.

FIG. 5 is a cross-sectional view showing a state of joining of rising portions.

FIG. 6 is a perspective view showing another embodiment of the plate heat exchanger according to the present invention.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a sectional view showing still another embodiment.

FIG. 9 is a sectional view showing still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate heat exchanger 3 Plate 4 Bottom plate 5 Shielding material 6-9 Communication hole 11 Inlet pipe 12 Outlet pipe 13 Inlet pipe 14 Outlet pipe 41,42,43 Element 51,53 Outer box

Continuation of front page (72) Inventor Yasushi Kamada 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3L103 AA01 BB42 CC01 DD09 DD52

Claims (6)

[Claims] 1. A method in which two dish-like plates are superimposed,
A plate-type heat source, wherein the peripheral portions are welded together, and the peripheral portions of adjacent communication holes are welded together to form one element, and these elements are overlapped and the peripheral portions are welded. Exchanger. 2. The two dish-shaped plates are superimposed,
The peripheral edges are welded together, and the peripheral edges of the adjacent communication holes are welded together to form one element, and these elements are superimposed and stored in a box-shaped outer box, which is located on the outermost side. A plate-type heat exchanger, wherein a peripheral edge of a plate constituting an element is welded to an inner wall of the outer box. 3. Overlapping two dish-shaped plates,
The peripheral portions are welded together, and the peripheral portions of the adjacent communication holes are welded together to form one element, and these elements are superimposed and stored in a bottomed box-shaped outer box. A plate-type heat exchanger, wherein a peripheral portion of a plate constituting a positioned element is formed by welding to an inner wall of the outer box. 4. A method in which two dish-shaped plates are overlapped,
The peripheral portions are welded together, the peripheral portions of adjacent communication holes are welded together to form one element, and these elements are overlapped and the peripheral portions are sequentially welded and assembled. Manufacturing method of plate heat exchanger. 5. A method in which two dish-like plates are overlapped,
The peripheral edges are welded together, and the peripheral edges of the adjacent communication holes are welded together to form one element, and these elements are superimposed and stored in a box-shaped outer box, which is located on the outermost side. A method for manufacturing a plate-type heat exchanger, comprising welding a peripheral edge of a plate constituting an element to an inner wall of the outer box. 6. A method in which two dish-shaped plates are overlapped,
The peripheral portions are welded together, and the peripheral portions of the adjacent communication holes are welded together to form one element, and these elements are superimposed and stored in a bottomed box-shaped outer box. A method for manufacturing a plate-type heat exchanger, wherein a peripheral portion of a plate constituting a positioned element is assembled by welding to an inner wall of the outer box.