JP4471423B2 - Plate heat exchanger - Google Patents

Description

[0001]
BACKGROUND 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 flow paths are alternately formed between the plates.
[0002]
[Prior art]
In general, a plate heat exchanger is known in which a plurality of plate-like plates are stacked one above the other and two fluid flow paths are alternately formed between the plates.
[0003]
In general, this kind of fluid does not leak to the outside through the two fluid flow paths, and the fluids are not mixed inside, excellent in heat exchange performance, low initial cost, etc. Is required.
[0004]
In this conventional plate heat exchanger, corrugated (herringbone) irregularities are formed by press molding at the bottom of each plate, and a step is formed. The parts are welded, and the peripheral part of the communication hole formed in each plate is welded to be assembled.
[0005]
[Problems to be solved by the invention]
However, in the conventional configuration, adjacent peripheral portions of the communication holes formed in each plate are welded to each other, so that the welding operation becomes difficult. In addition, in order to improve the alignment accuracy of each communication hole, dimensional accuracy is required for processing of each communication hole, and this becomes a bottleneck, making it impossible to automate welding. Furthermore, after welding, since the peripheral edge portion of each communication hole is located inside the heat exchanger, it cannot be corrected even if a welding leak occurs. In addition, since the fluid inlet pipe or outlet pipe is welded to the outermost communicating hole of the plate communicating holes, piping stress or thermal stress concentrates on that part. There is a problem that cracks or the like are likely to enter the joint portion.
[0006]
Furthermore, in the conventional configuration, for example, after two plates are welded and joined, the plates can only be assembled one by one, so that welding work is complicated and workability is improved. There are problems such as bad.
[0007]
Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional technology, facilitate assembly, facilitate welding automation, do not concentrate stress on the piping, and reduce the assembly time. To provide an exchange.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is provided with a plurality of plates having rising walls at both side edges and steps at the bottom, and different fluid flow paths in one half and the other half with respect to the steps of the plates. As shown in the figure, the plates are overlapped, and the rising walls of adjacent plates are joined together so that the fluid flowing through each flow path is not mixed, and these plates are placed in the opening in the outer box with both ends open. Each channel is stored so that it faces, and the headers that make up the entrance and exit are welded to the openings at both ends of the outer box . The header is partitioned by a partition, and the partition corresponds to the level difference of the plate. Welded to the partition of the outer box, the first system fluid enters from the header opening 81 of the inlet portion, and is discharged from the opening 82 of the outlet header through the fluid passage formed in one half, The second system fluid is Heat enters between the first system fluid and the second system fluid through the fluid flow path formed in the other half, entering from the header opening 83 in the inlet section, and exhausted from the header opening 84 in the outlet section. It is characterized by exchanging .
[0009]
The invention described in claim 2 has two plates having rising walls on both side edges and a step on the bottom, and one half of the bottom is in close contact with the other step on the other step. Overlapping so as to form the first flow path, the rising walls of the two plates are joined together to form a plurality of elements, and each element is connected to the second half on the one half side with the step as a boundary. so as to form a flow path, both ends accommodated to face each flow path to the opening in the outer box with an opening, and welding the header constituting the entrance portion to the opening portions at both ends of the outer box, the The header is partitioned by a partition, and the partition is welded to the partition of the outer box corresponding to the level difference of the plate. The first system fluid enters from the opening 81 of the header at the inlet, and the first The second system is discharged from the opening 82 of the outlet header through the flow path of The fluid enters from the opening 83 of the header of the inlet portion, is discharged from the opening 84 of the header of the outlet portion through the second flow path, and exchanges heat between the fluid of the first system and the fluid of the second system. It is characterized by doing .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0011]
In FIG. 1, the code | symbol 1 has shown the comparatively large plate type heat exchanger suitable for using, for example in an absorption refrigerator.
[0012]
As shown in FIG. 2, the plate heat exchanger 1 has an outer box 51, and a plurality of SPCC plates (for example, thickness t = 0.5 mm) 3 are stacked in the outer box 51. Stored and configured. As shown in FIG. 4, each plate 3 has rising walls 3a at both side edges, a step 53 at the bottom 3b, and both end edges 3c are cut off.
[0013]
Further, a corrugated (herringbone) projection 55 is integrally formed on the bottom 3b of each plate 3 by press molding, and this projection 55 is formed when the plates 3 are combined as shown in FIG. It projects between the flow paths A and B formed between the plates 3 to form a turbulent flow in the flow.
[0014]
Referring to FIG. 4, the step 53 of each plate 3 will be described in detail. In the lower plate 3A, the left half (one half) 10 of the bottom 3b is shallow in the figure, and the right half (the other half) of the bottom 3b. Part) 20 is formed deep, and a step 53A is formed at the center thereof. On the other hand, in the upper plate 3B, in the drawing, the left half (one half) 30 of the bottom 3b is deep, the right half (other half) 40 of the bottom 3b is shallow, and a step 53B is formed in the center. Has been. When these plates 3A and 3B are laminated together with the steps 53A and 53B, as shown in FIG. 5, the half portions 10 and 30 are in close contact with each other, and the other half portions 20 and 40 have a space (first A flow path) A is formed.
[0015]
In this state, the rising walls of the plates 3 </ b> A and 3 </ b> B are seam-welded 11, and the edges of the half portions 10 and 30 that are in close contact with each other are TIG-welded 12 to form one element 41.
[0016]
As shown in FIG. 2, the plate heat exchanger 1 has two elements 42 and 43 in addition to the element 41, which are the rising walls of the plates 3 </ b> C, 3 </ b> D, 3 </ b> E, and 3 </ b> F, The edges of the half portions 10, 30 that are in close contact with each other are welded in the same procedure. The uppermost element 43 has a cross-sectional shape different from those of the other elements 41 and 42, but the manufacturing procedure is the same. Between the upper surface of the step 53 of the element 43 and a lid 51a described later. Sealing is performed by sealing means (not shown).
[0017]
Each element 41 to 43 opens the lid 51 a of the outer box 51, and is sequentially housed inside from the opening, and then the lid 51 a is welded to the outer box 51. In addition, when each element 41-43 is accommodated in the outer box 51, using the inclination angle of the rising wall 3a of each plate 3, the tip of the rising wall 3a is pressed against the inner surface of the outer box 51. Each element 41-43 is accommodated.
[0018]
According to this, the elements 41 to 43 are overlapped so as to form a space (second flow path) B on the half portions 10 and 30 side with the step 53 as a boundary, and stored in the outer box 51. Is done. And when these are accommodated, this space B and said space A will face the opening part of the both ends of the outer case 51. FIG.
[0019]
As shown in FIG. 3, partition bodies 57 are provided at the openings at both ends of the outer box 51. And the edge of each plate 3A-3F accommodated in this outer box 51 is TIG-welded to the partition 57, and, thereby, the flow paths A and B between each plate are completely partitioned. In order to facilitate welding between the edge of each of the plates 3A to 3F and the partition 57, it is desirable to interpose a welding piece 58 therein.
[0020]
Finally, as shown in FIG. 1, headers 71 and 73 constituting the entrance / exit of this heat exchanger are TIG welded to the openings at both ends of the outer box 51. The headers 71 and 73 are each partitioned by a partition body 75, and the partition body 75 is welded to the partition body 57 of the outer box 51. The openings 81 to 84 formed in the headers 71 and 73 constitute the entrances and exits of the two fluid flow paths, respectively.
[0021]
That is, the first system fluid enters from the opening 81, flows through the heat exchanger 1 through the alternately provided first flow paths A, and is discharged from the opening 82. Further, the fluid of the second system enters from the opening 83, flows through the heat exchanger 1 through the second flow paths B provided alternately, and is discharged from the opening 84. During this time, heat exchange is performed between the fluid of the first system and the fluid of the second system.
[0022]
In FIG. 1, the opening 81 and the opening 82 communicate only with the first flow path A, the opening 83 and the opening 84 communicate with only the second flow path B, and other communication is impossible. As described above, the headers 71 and 73 constituting the entrance and exit of the heat exchanger are attached to the opening portions at both ends of the outer box 51.
[0023]
When this plate heat exchanger 1 is used in an absorption refrigerator, one is a concentrated liquid and the other is a rare liquid. The pressure difference between the two is small.
[0024]
In this embodiment, when manufacturing each element 41-43, since the standing walls of the plate 3 can be seam-welded, welding work is easy and welding without leakage can be performed within a short time.
[0025]
In this embodiment, the irregularities 55 are formed by press molding on the bottom 3b of each plate 3. However, the present invention is not limited to this, and the bottom 3b of each plate 3 is formed on a flat surface. A shielding material (not shown) made of another member can be interposed between the plates 3.
[0026]
This shielding material extends in each fluid flow path (regions A and B), and has a function of maintaining a uniform dimension between the plates 3 and generating turbulence. For example, the shielding material is configured by arranging a plurality of round bars at right angles and welding the intersections of the round bars. This shielding material is disposed between the plates, but is preferably spot-welded, for example, to the bottom of the plate 3.
[0027]
In this embodiment, the headers 71 and 73 are provided by welding, and openings 81 to 84 are formed therein, and through these openings 81 to 84, two fluid flow paths are respectively inserted and removed. Thus, since it is not necessary to form a communication hole in each plate 3, and it is not necessary to weld the adjacent peripheral parts of each communication hole, the process of welding work can be reduced. Moreover, since it is not necessary to align each communicating hole and each element 41-43 is only accommodated in the outer box 51, automation of welding including the process of manufacturing each element 41-43 is achieved. .
[0028]
Furthermore, since each plate 3 does not have a communication hole, the number of welding points is reduced and leakage due to poor welding is reduced.
[0029]
Further, since the openings 81 to 84 are formed in the headers 71 and 73 to constitute the fluid inlet / outlet port, the fluid communication hole located on the outermost side among the communication holes of the plate 3 is formed in the fluid communication hole as in the prior art. Compared to the welded inlet pipe or outlet pipe of this type, the pipe stress does not concentrate on that part, or thermal stress does not concentrate, and cracks etc. are likely to occur in the joint part of the pipe. Is resolved.
[0030]
Furthermore, in the conventional configuration, for example, after two plates are welded and joined, the plates can only be assembled one by one, so that welding work is complicated and workability is improved. Although it was bad, in this embodiment, after manufacturing each element 41-43, it accommodates in the outer box 51, and each header 71,73 is welded to the opening part of this both ends of this outer box 51, Therefore Workability | operativity And the manufacturing cost of the plate heat exchanger 1 can be reduced.
[0031]
As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this. For example, the outer box 51 or the headers 71 and 73 are not limited to those described above, and the form thereof can be arbitrarily changed. Further, the welding may be of any welding type and is not limited to the above type.
[0032]
【The invention's effect】
According to the present invention, it is easy to assemble a plate heat exchanger, it is easy to automate welding, stress is not concentrated on the piping portion, and the assembly time can be shortened.
[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 a cross-sectional view taken along the line II-II in FIG.
3 is a sectional view taken along line III-III in FIG.
FIG. 4 is an exploded perspective view of two plates.
FIG. 5 is an assembled perspective view of two plates.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plate type heat exchanger 3 Plate 10, 30 One half 20, 40 Other half 41-43 Element 51 Outer box 53 Level | step difference 71, 73 Header 81-84 Opening

Claims (2)

Each plate is provided with a plurality of plates having rising walls at both side edges and steps at the bottom, and different fluid flow paths are formed in one half and the other half with the step of the plate as a boundary. In addition to overlapping, the rising walls of adjacent plates are joined together so that the fluid flowing through each flow path is not mixed, and these plates are stored in an outer box with both ends open so that each flow path faces the opening. The headers constituting the entrance / exit part are welded to the openings at both ends of the outer box, and the header is partitioned by a partition body, and the partition body is welded to the partition body of the outer box corresponding to the step of the plate The first system fluid enters from the opening 81 of the inlet header, and is discharged from the opening 82 of the outlet header through the fluid passage formed in one half. Part header opening In from 3, through the fluid flow path formed on the other half, is discharged from the opening 84 of the header in the outlet portion, characterized by performing the heat exchange with the fluid in the fluid and the second system of the first system A plate heat exchanger. Two plates with rising walls on both side edges and a step on the bottom are brought into close contact with each other at the bottom, and the first channel is formed in the other half. In order to form a plurality of elements by joining the rising walls of the two plates and forming each element, the second flow path is formed on the one half side with the step as a boundary. both ends accommodated to face each flow path to the opening in the outer box with an opening, and welding the header constituting the entrance portion to the opening portions at both ends of the outer box, the header respectively internally by a partition member The partition body is welded to the partition body of the outer box corresponding to the level difference of the plate, and the fluid of the first system enters from the opening 81 of the header of the inlet section, passes through the first flow path, The fluid of the second system discharged from the opening 82 of the header passes through the inlet head. Enters from the opening 83, plate through the second flow path is discharged from the opening 84 of the header in the outlet portion, and performs heat exchange with the fluid in the fluid and the second system of the first system Type heat exchanger.

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