JP2001099586A - Plate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate type heat exchanger capable of facilitating assembling and automating of welding and shortening an assembling time without concentrating a stress at piping. SOLUTION: The plate type heat exchanger comprises a plurality of plates 3 each having rising walls at both side edges and a step at a bottom. In this case, the plates 3 are superposed so that different fluid channels are formed at one half part 10 and another half part 20 at the step as a boundary. The rising walls of the adjacent plates 3 are connected so that the fluids flowing to the respective channels are not mixed. The plates 3 are contained in an outer case 51 opened at both ends so that the channels are opposed to the openings. Then, headers 71, 73 for constituting an exit and an entrance are welded to the openings of both the ends of the case 51.

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.

In this conventional plate heat exchanger, corrugated (herringbone) irregularities are formed at the bottom of each plate by press molding, and a step is formed. The plate is welded to the periphery, and the periphery of the communication hole formed in each plate is welded.

[0005]

However, in the conventional configuration, the adjacent peripheral portions of the communication holes formed in each plate are welded to each other, so that the welding operation becomes difficult. Further, in order to improve the positioning accuracy of each communication hole, dimensional accuracy is required for processing of each communication hole, and this becomes a bottleneck, so that welding cannot be automated. Further, after welding, the peripheral edge of each communication hole is located inside the heat exchanger, so that even if welding leakage occurs, it cannot be corrected. Also, since the fluid inlet pipe or the outlet pipe is welded to the outermost communication hole among the communication holes of the plate, pipe stress concentrates at that part, or thermal stress concentrates, There is a problem that a crack or the like is liable to be formed in the joint portion.

Further, in the conventional configuration, for example, after two plates are welded and joined together, they can be assembled only by one or two sheets, and the welding operation is complicated. There are problems such as poor workability.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, to facilitate assembly, to facilitate automation of welding, not to concentrate stress on piping, and to reduce assembly time. An object of the present invention is to provide a plate heat exchanger.

[0008]

According to the first aspect of the present invention,
A plurality of plates having a rising wall on both side edges and a step on the bottom are provided, and each plate is formed such that different fluid flow paths are formed in one half and the other half with the step of the plate as a boundary. At the same time, the rising walls of the 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 having both ends opened so that each flow path faces the opening. A header constituting an entrance is welded to openings at both ends of the outer box.

According to a second aspect of the present invention, two plates having rising walls on both side edges and a step on the bottom are provided.
At the border of the step, one half of the bottom portion is in close contact with each other, and the other half is overlapped so as to form the first flow path, and the rising walls of the two plates are joined to form a plurality of elements. Then, each element is housed such that each flow path faces the opening in an outer box having both ends opened so as to form a second flow path on the half side with the step as a boundary, A header constituting an entrance is welded to openings at both ends of the outer box.

[0010]

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 indicates a relatively large plate heat exchanger suitable for use in, for example, an absorption refrigerator.

The plate heat exchanger 1 has an outer box 51 as shown in FIG.
A CC-made plate (for example, thickness t = 0.5 mm) 3 is stacked and stored. As shown in FIG. 4, each plate 3 has a rising wall 3a on both side edges,
The bottom 3b has a step 53, and both end edges 3c are cut off.

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 combined with each plate 3 as shown in FIG. In this case, the flow protrudes between the flow paths A and B formed between the plates 3 to form a turbulent flow.

Referring to FIG. 4, step 53 of each plate 3 is provided.
More specifically, in the lower plate 3A, the left half (one half) 10 of the bottom 3b is shallow, the right half (other half) 20 of the bottom 3b is formed deep in the figure, and a step is formed at the center thereof. 5
3A is formed. On the other hand, in the upper plate 3B,
In the figure, the left half (one half) 30 of the bottom 3b is deep,
The right half (the other half) 40 of b is formed shallow, and a step 53B is formed in the center. These plates 3A,
When 3B is laminated with the steps 53A and 53B together, as shown in FIG. 5, the first half portions 10 and 30 are in close contact with each other, and the other half portions 20 and 40 have a space (first flow path) A on the side. Is formed.

In this state, the rising walls of the plates 3A, 3B are seam-welded 11 together, and the edges of the halves 10, 30 which are in close contact with each other are TIG-welded 12 to form one element 41.

As shown in FIG. 2, this plate type heat exchanger 1 has two elements 4 in addition to the element 41.
2, 43, which are each plate 3C, 3D and 3
The rising walls of E and 3F and the edges of the half portions 10 and 30 that are in close contact with each other are formed by welding in the same procedure. Although the cross-sectional shape of the uppermost element 43 is different from that of the other elements 41 and 42, the manufacturing procedure is the same, and the upper surface of the step 53 of the element 43 and a lid 51a described later are not provided. It is sealed by sealing means not shown.

Each of the elements 41 to 43 is a cover 5 of the outer box 51.
1a is opened, and is housed in order from the opening, and then the lid 51a is welded to the outer box 51. When each of the elements 41 to 43 is stored in the outer box 51, the tip of the rising wall 3 a is pressed against the inner surface of the outer box 51 by using the inclination angle of the rising wall 3 a of each plate 3. Each of the elements 41 to 43 is stored.

According to this, each element 41-43
Are overlapped so as to form a space (second flow path) B on the side of the first half 10, 30 on the side of the step 53, and are housed in the outer box 51. When these are stored, the space B and the space A face the openings at both ends of the outer box 51.

As shown in FIG. 3, partition members 57 are provided at the openings at both ends of the outer box 51, respectively. Each of the plates 3A to 3A stored in the outer box 51
The edge of F is TIG welded to the partition body 57, whereby the flow paths A and B between the plates 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 there.

Finally, at the openings at both ends of the outer box 51, FIG.
As shown in (1), the headers 71 and 73 constituting the entrance and exit of this heat exchanger are TIG-welded. And this header 7
The inside of each of the first and third members 73 is partitioned by a partition member 75, and the partition member 75 is welded to the partition member 57 of the outer box 51.
The openings 81 to 84 formed in each of the headers 71 and 73 constitute entrances and exits of two fluid flow paths.

That is, the fluid of the first system enters through the openings 81, flows through the heat exchanger 1 through the first alternately provided flow paths A, and is discharged from the openings 82. Further, the fluid of the second system enters from the opening 83, flows through the heat exchanger 1 through the alternately provided second flow paths B, 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.

In FIG. 1, the openings 81 and 8
2 communicates only with the first flow path A, and has openings 83 and 8
4 is a header 7 that constitutes the entrance and exit of the heat exchanger, so that it communicates only with the second flow path B and no other communication is possible.
1, 73 are attached to the openings at both ends of the outer box 51.

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.

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

In this embodiment, the unevenness 55 is formed on the bottom 3b of each plate 3 by press molding. However, the present invention is not limited to this. The bottom 3b of each plate 3 is formed on a flat surface. Instead, it is possible to interpose a shielding member (not shown) made of another member between the plates 3.

The shielding member is provided for each of the fluid flow paths (areas A and B).
It has a function of maintaining the dimensions between the plates 3 substantially uniform and generating a turbulent flow. This shielding material is configured by, for example, arranging a plurality of round bars orthogonally and welding the intersection of each round bar. This shielding material is disposed between the plates, but is preferably spot-welded to the bottom of the plate 3, for example.

In this embodiment, the headers 71 and 73 are provided by welding, and openings 81 to 84 are formed therein, and two systems of fluid flow paths enter and exit through the openings 81 to 84, respectively. Unlike the related art, there is no need to form a communication hole in each plate 3 and there is no need to weld adjacent peripheral portions of each communication hole, so that the number of welding steps can be reduced. Further, it is not necessary to perform the alignment of each communication hole, and each element 41 to 43 is connected to the outer box 5.
1, each element 41 to 43
Of the welding, including the process of manufacturing

Further, since there is no communication hole in each plate 3, the number of welding points is reduced, and leakage due to poor welding is reduced.

Openings 81 to 8 are provided in the headers 71 and 73, respectively.
4, a fluid inlet / outlet is formed by welding a fluid inlet tube or an outlet tube to the outermost communication hole among the communication holes of the plate 3 as in the related art. In comparison with this, the pipe stress does not concentrate at that portion or the thermal stress does not concentrate, and defects such as cracks and the like at the joints of the pipes are easily solved.

Furthermore, in the conventional configuration, for example, after welding and joining two plates, they can be assembled only by one or two sheets at a time, and the welding operation is complicated. Workability was poor, but in this embodiment,
After the elements 41 to 43 are manufactured, they are housed in the outer box 51, and the headers 71, 7
Since only 3 is welded, workability can be improved, and the manufacturing cost of the plate heat exchanger 1 can be reduced.

Although the present invention has been described based on an embodiment, the present 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 can be arbitrarily changed. The welding may be of any welding type, and is not limited to the above-mentioned type.

[0032]

According to the present invention, the plate type heat exchanger can be easily assembled, welding can be easily automated, stress is not concentrated on the piping, and the assembling 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 sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

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 Step 71, 73 Header 81-84 Opening

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Kamata 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3L103 AA01 DD15 DD55 DD57 DD58

Claims (2)

[Claims] 1. A plurality of plates having a rising wall on both side edges and a step on a bottom, and different fluid flow paths are formed in one half and the other half with the step of the plate as a boundary. At the same time, the plates are overlapped and the rising walls of adjacent plates are joined together so that the fluid flowing through each channel is not mixed. A plate-type heat exchanger, wherein headers forming entrances and exits are welded to openings at both ends of the outer box. 2. A pair of plates each having a rising wall on both side edges and a step on the bottom, wherein one half of the bottom is in close contact with the step and the first half is on the other half. A plurality of elements are formed by stacking the rising walls of the two plates together so as to form a flow path and forming a plurality of elements. In order to form, an outer box having both ends opened is housed such that each flow path faces the opening, and a header constituting an entrance is welded to the opening at both ends of the outer box. Plate heat exchanger.