JP2000180077A - Plate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure strength and airtightness by forming an outer edge part having a small inclination angle at the upper edge of a side edge part raised from the circumferential edge of a copper plate by press, inserting a brazing material into an opening groove formed between the upper and lower edge parts of a laminated heat transfer plate and then brazing them thereby eliminating defective welding. SOLUTION: A protruding and recessed plane 12 is provided on one side and a side edge part 11a is raised from the circumferential edge of a heat transfer plate 10 having a substantially square plan view thus forming a pan shape. An outer edge part 11b having a small inclination angle is then formed at the upper edge. The opening in an upper stage heat transfer plate is then fitted with the projecting edge 17 of the opening 16 in the lower stage heat transfer plate 10 thus laminating a plurality of sheets. The side edge part 11a and the outer edge part 11b provide a double stage inclination and an opening groove is provided between upper and lower outer edge parts 11b. A sheet-like brazing material 18 is laid on each heat transfer plate 10 and a rod-like brazing material 19 is inserted into the opening groove and secured in place before being brazed in an electricfurnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger formed by laminating a predetermined number of heat transfer plates each having a continuous uneven surface.

[0002]

2. Description of the Related Art In recent years, plate heat exchangers have become widespread for heating, cooling, heat recovery and the like in various types of chemical equipment and heat appliances. This plate type heat exchanger is composed of multiple layers of heat transfer plates with continuous irregular surfaces such as corrugated or hemispherical shells formed by pressing a metal plate, and a narrow space between the heat transfer plates. A fluid channel at intervals is formed, and two types of fluid such as liquid-liquid and liquid-gas are alternately circulated through this channel to perform heat exchange. High heat efficiency is achieved by a dramatic increase in the heat transfer area. It will be realized.

[0003]

Such a plate heat exchanger is manufactured by welding a predetermined number of stacked heat transfer plates by welding. However, insufficient welding area is liable to occur due to shortage of the joining area, and strength and airtightness are required. There is a problem in securing sex.

An object of the present invention is to solve these problems, and a heat transfer plate formed by press working is provided.
An object of the present invention is to provide a plate heat exchanger that can be firmly joined by brazing.

[0005]

In order to achieve the above object, a plate heat exchanger according to the present invention comprises a plate heat exchanger formed by laminating a predetermined number of heat transfer plates having continuous uneven surfaces. In the exchanger, an outer edge portion having a small inclination angle is formed on an upper edge of a side edge portion raised on a peripheral edge by pressing a copper plate, and the heat transfer plate is formed in a dish shape. Then, a brazing material is inserted into an opening groove formed between the upper and lower outer edges of the laminated heat transfer plate and brazed, and the brazing material is melted in the furnace. As a result, it can flow between the side edges and be reliably welded.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. In the drawing, a heat transfer plate 10 having a continuous uneven surface 12 formed on one surface is formed by pressing a copper plate, and the uneven surface 12 is formed in a linear corrugated shape. The heat transfer plate 10 is formed in a substantially square shape in plan view, and is formed in a dish shape with the side edge portion 11a raised at the periphery. Further, an outer edge portion 11b having a small inclination angle is formed on the upper edge of the side edge portion 11a, so that the peripheral edge of the heat transfer plate 10 is formed by the side edge portion 11a and the outer edge portion 1b.
1b, the inclination is formed in two steps.

Two types of openings 15 and 16 are formed at adjacent corners of the heat transfer plate 10, and these openings 15 and 16 are formed.
Are located at radial positions separated from the center of the heat transfer plate 10 by 90 degrees. Further, a ridge 17 is formed on one of the openings 16 by burring the peripheral edge, and the other opening 1 is formed.
5 is formed to a size in which the protruding edge 17 is inserted.

The assembly of the plate heat exchanger is performed as shown in FIG. Here, the heat transfer plate 10b to be superimposed on the heat transfer plate 10a is rotated by 90 degrees, and the protruding edge 17a of the lower heat transfer plate 10a is fitted into the opening 15b and is superposed. Similarly, the heat transfer plate 10c is rotated by 90 degrees with respect to the heat transfer plate 10b, and the protruding edge 17b is inserted into the opening 15c and overlapped.
The heat transfer plate 10d is rotated by 90 degrees with respect to the heat transfer plate 10c and overlapped. In this manner, the heat transfer plates 10 are sequentially rotated by 90 degrees, the protruding edges 17 of the lower heat transfer plate 10 are inserted into the openings 15, and a predetermined number of the heat transfer plates 10 are stacked and assembled. FIG. 4 shows a structure in which thirteen heat transfer plates 10 are stacked and formed. Fluid inlet pipes and outlet pipes 20, 21 and 22 are provided in the openings 15 and 16 of the uppermost and lowermost heat transfer plates 10, respectively. , 23 are joined to form a plate heat exchanger.

The flow of the fluid in the plate heat exchanger will be described. Referring to FIG. 3, the fluid flowing into the space between the heat transfer plate 10a and the heat transfer plate 10b from the opening 15a of the heat transfer plate 10a is paired. The heat is distributed in a square shape and guided from the opening 16b of the heat transfer plate 10b to the protruding edge 17b thereof.
d flows into the gap. Thus, the upper and lower heat transfer plates 1
Since the fluid flows through each layer defined by 0 and the protruding edge 17 is inserted into the opening 15 at the upper stage, each layer communicates with the upper and lower layers. Therefore, two kinds of fluids, such as liquid-liquid and liquid-gas, are passed through these alternate layers to perform heat exchange. In each layer, the fluid flows in the diagonal direction, and the fluid flowing in the upper and lower layers via the heat transfer plate 10 becomes an intersecting flow, so that efficient heat exchange is performed.

FIG. 5 illustrates the means for welding the plate heat exchanger. As described above, the peripheral edge of the heat transfer plate 10 is formed in two steps with the side edge portion 11a and the outer edge portion 11b, and the upper and lower outer edge portions 11b of the stacked heat transfer plate 10 are formed.
An opening groove is formed between them. A sheet-like brazing material 18 having holes corresponding to the openings 15 and 16 is laid on each heat transfer plate 10 and a predetermined number of the brazing materials 18 are laminated as described above. It is inserted and fixed with a predetermined jig, and it is manufactured by brazing in an electric furnace. The wax melted in the furnace flows into and welds between the side edge portions 11a by capillary action, and flows into and welds to a point contact portion of the uneven surface 12 of each heat transfer plate 10. Note that the brazing material may be wound around the outer periphery of the protruding edge 17 in a ring shape and brazed.

In this embodiment, the plane shape of the heat transfer plate 10 is formed to be substantially square and rotated 90 degrees to form an overlapping shape. However, the shape of the heat transfer plate 10 is formed to be circular, rectangular, or other polygonal shape. Alternatively, the configuration of the fluid passage is not limited to the embodiment.

[0012]

As described above, according to the present invention, the outer edge 11 having a small inclination angle is provided on the upper edge of the side edge 11a rising on the peripheral edge.
b, the peripheral edge of the heat transfer plate 10 is formed by a two-step inclined surface, and the brazing material 19 inserted into the opening groove formed between the upper and lower outer edges 11 b of the laminated heat transfer plate 10 is a side edge. Part 11a
And can be securely and firmly welded. Also,
The attachment of the brazing material 19 is easy and can be visually checked, so that the brazing material 19 is not left behind, so that the improvement of the welding workability and the improvement of the jointability can be achieved at the same time.

[Brief description of the drawings]

FIG. 1 is a plan view of a heat transfer plate according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is an exploded perspective view showing an assembling method.

FIG. 4 is a sectional view of an assembled state.

FIG. 5 is a sectional view of a main part showing a welding method.

[Explanation of symbols]

 Reference Signs List 10 heat transfer plate 11a side edge 11b outer edge 12 uneven surface 19 brazing material

Claims (1)

[Claims] 1. A plate heat exchanger formed by laminating a predetermined number of heat transfer plates (10) each having a continuous uneven surface (12) formed thereon. Edge (1
1a) An outer edge (11b) having a small inclination angle is formed on the upper edge, and the heat transfer plate (10) is formed in a dish shape. A plate type heat exchanger characterized in that a brazing material (19) is inserted into an opening groove formed by the method and brazed.