JPH0571888A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To protect an uneven portion which adjoins a flanged section from being brazed and enhance pressure resistance and durability by forming a lower projection which adjoins the flanged section and forming a space on the site. CONSTITUTION:When a high pressure heat exchanger medium A is distributed in a flow passage (a), pressure is applied to a brazed flanged section 5c. However, a projected part 5b, which is adjacent to the flanged section 5c is formed in a lower level and a span is formed between uneven portions 5a' and 5b' where no brazing is applied thereto so that a large concentrated load is added to the uneven portions 5a' and 5b'. Therefore, this construction protects the uneven portion 5a', which is adjacent to the flanged section 5c of a plate 5 from fracture even when the high pressure heating medium A passes in the flow passage (a) so that the pressure resistance and durability may be enhanced.

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 of the type in which a plurality of heat transfer plates having uneven portions are laminated and the flanges of the heat transfer plates are brazed. The present invention relates to a plate heat exchanger in which adjacent concavo-convex portions are not brazed.

[0002]

2. Description of the Related Art In a plate heat exchanger, a plurality of heat transfer plates are laminated at intervals, and two kinds of heat exchange media A and B are alternately flow paths a and b between adjacent heat transfer plates. It was formed in. Conventionally, a gasket is interposed between a plurality of heat transfer plates to form the flow paths a and b of the two types of heat exchange media A and B that ensure airtightness between the heat transfer plates. However, in recent years, a brazing type plate heat exchanger (BHE) without a gasket has been developed.
This heat exchanger has features such as excellent corrosion resistance, high heat resistance and pressure resistance, and no leakage under ultra-vacuum.

A conventional example of such a heat exchanger will be described with reference to FIGS. In this heat exchanger, a plurality of heat transfer plates (2) (2) ... Are sandwiched vertically between a pair of vertical frames (1) (1), and each heat transfer plate (2) (2) ) ... Two channels (a) and (b) are formed between them. For example, inlet / outlet nozzles (3) are provided at four corners of one frame (1) (only one location is shown in FIG. 2), and each flow path (a) is provided as shown in FIG.
Different heat exchange media (A) and (B) flow alternately in (b). The different heat exchange media (A) and (B) are heat-exchanged via the heat transfer plates (2) (2). In order to improve the efficiency of heat exchange, the heat transfer plate (2) has uneven parts (2a)
(2b) is formed (the concave portion (2a) is stippled in FIG. 3). The uneven portions (2a) (2b) are formed up to the end of the outer peripheral edge of the heat transfer plate (2) in order to improve heat transfer performance, and the heat transfer between the uneven portions (2a) (2b) is adjacent. Each plate (2) (2) ... is reversed. Uneven part (2
As a) and (2b) are in opposite directions, as shown in the vertical cross section of FIG. 4, the concave portion (2a) and the convex portion (2b) are in contact with each other and laminated, or the concave portion (2a) A portion or the like is formed in which the convex portion (2b) and the convex portion (2b) are laminated with a constant gap. In addition, the flange portion (2c) of the heat transfer plate (2) (2) ...
(2c) ... are inclined at the same angle, and adjacent flange portions (2c) (2c) ... are brazed by brazing materials (4) (4) ..., and a plurality of heat transfer plates (2) (2) ... are integrated. After applying the brazing material (4) to the flange portion (2c), the heat transfer plates (2), (2) ... Are stacked in a horizontal posture and carried into the furnace. Then, when heated, the brazing material (4) is melted in a liquid state. As shown in FIG. 4, the liquid brazing material (4) is not only in a state of permeating between the joined flange portions (2c) (2c), but also adjacent to the flange portions (2c) (2c). Then, it penetrates between the uneven portions (2a ') (2b') that are in point contact with each other by the surface tension. Flange part (2c) (2c) ... and flange part (2c) (2c) joined in this way
Solidify in a state where the liquid brazing material (4) has penetrated into the uneven portions (2a ') and (2b') adjacent to. Then, the flange portions (2c) (2c) ... are brazed in a planar shape, but the convexo-concave portions (2a ') (2b) adjacent to the flange portions (2c) (2c). ') Is brazed in dots. By brazing the flange parts (2c) (2c) ...
The closed flow paths (a) and (b) are alternately formed between the adjacent heat transfer plates (2) (2).
The heat exchange media (A) and (B) are circulated through (b).

[0004]

The heat transfer plates (2) and (2) constituting the flow path (a) through which the heat exchange medium (A) flows.
The contact portion between the concave portion (2a ') and the convex portion (2b'), which are formed as close as possible to the outer peripheral edge, is formed close to the flange portion (2c) as shown in FIG. .. Therefore, when the high-pressure heat exchange medium (A) is flown through the flow path (a), a large concentrated load is applied to the contact portions of the uneven portions (2a ') (2b') brazed in a dot shape, The said part of this uneven | corrugated part (2a ') (2b') may fracture | rupture.

It is an object of the present invention to provide a plate heat exchanger in which the flange portion can be brazed in a planar shape without the uneven portion adjacent to the flange portion being brazed.

[0006]

In order to achieve the above object, a plate-type heat exchange in which a plurality of heat transfer plates each having an uneven portion are laminated, and a flange portion of the heat transfer plate having an inclined outer peripheral edge is brazed A plate-type heat exchanger, characterized in that a convex portion adjacent to a flange portion is formed low and a space portion is formed at a portion adjacent to the flange portion.

[0007]

By forming the convex portion adjacent to the flange portion low, when the heat transfer plates are stacked, the concave portion and the convex portion do not come into contact with each other, and a space is formed. Therefore, the brazing material applied to the flange portion and melted in a liquid state does not permeate between the concave portion and the convex portion, and the uneven portion is not brazed in a dot shape.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIG. However, the same parts as the conventional ones are given the same reference numerals,
The description is omitted.

The heat transfer plate (5) according to the present invention also has the uneven portions (5a) (5b), but the convex portion (5b ') adjacent to the flange portion (5c) at the outer peripheral edge is lowered. Form.
When the heat transfer plates (5) are stacked, the flange (5
c) (5c) ... and the adjacent concavo-convex portions (5a ′) (5b ′) ... are not in contact with each other, and a space (6) is provided between the concavo-convex portions (5a ′) (5b ′).
(6) ... Is formed. The outer peripheral portion of the heat transfer plate (5) has a flange portion (5c) inclined at the same angle as in the conventional case.
And

The brazing material (4) is applied to the flange portion (5c) of the heat transfer plate (5), and a plurality of the brazing materials are stacked in a horizontal posture. Heat transfer plate (5) in which a plurality of these are laminated
(5) ... When loaded into the furnace and heated, the brazing material (4)
(4) ... Melts in liquid form. Liquid brazing material (4) (4)
... penetrates between the joined flange portions (5c) (5c). Adjacent to the flanges (5c) (5c) ... Flow path (a)
The concave and convex portions (5a ') (5b') forming the space are the space portions (6).
Since (6) ... Is formed and not joined, the brazing material (4) (4) ...
b ') ... It does not penetrate in between. Liquid brazing material (4) between the flange portions (5c) (5c) ...
(4) ... Penetrates and the liquid brazing material (4) (4) ... is solidified, and the flange portions (5c) (5c) ... are brazed and are adjacent to the flange portions (5c) (5c). Uneven part (5a ') (5b')
... is a liquid brazing material (4) between both (5a ') (5b') ...
(4) ... has not penetrated, so it is not brazed.

In this way, the flange portions (5c) (5c) ...
Between the heat transfer plates (5) (5) ... When the high-pressure heat exchange medium (A) flows through the flow path (a), the brazed flange portions (5c) (5c) are pressed, but the flange portions (5c) (5c).
Since the concavo-convex portions (5a ') (5b') adjacent to ... are not brazed, a concentrated load, which is a large load, cannot be applied to the concavo-convex portions (5a ') (5b'). Therefore, even if the high-pressure heat exchange medium (A) flows through the flow path (a), the uneven portions (5a ′) () adjacent to the flange portions (5c) (5c) of the heat transfer plates (5). 5b ') ... no longer breaks.

[0012]

According to the present invention, since the uneven portion adjacent to the flange portion of the heat transfer plate is not brazed, a large concentrated load is not applied to that portion and the heat transfer plate is not broken. Therefore, the plate heat exchanger mounted with the heat transfer plate according to the present invention is remarkably improved in pressure resistance and durability and can be extended in service life.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a plate heat exchanger according to the present invention.

FIG. 2 is a partial cross-sectional perspective view of a conventional plate heat exchanger.

FIG. 3 is an exploded perspective view of a plate heat exchanger.

FIG. 4 is a sectional view of a main part of a conventional plate heat exchanger.

[Explanation of symbols]

 5 Heat transfer plate 5a '(Adjacent to the flange) Recess 5b' (Adjacent to the flange) 5c Flange 6 Space

Claims (1)

[Claims] 1. A plate heat exchanger in which a plurality of heat transfer plates each having an uneven portion are laminated, and a flange portion of the heat transfer plate having an inclined outer peripheral edge is brazed, and a convex portion adjacent to the flange portion is formed. A plate heat exchanger characterized by being formed low to form a space in a portion adjacent to the flange.