JP3054645B2 - Gasket for plate heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gasket for a plate heat exchanger.

[Conventional technology]

Generally, as shown in FIG. 4 (A), a plate of a plate type heat exchanger has passage holes (2), (3), (4), (5) at four corners serving as entrances and exits of a heat exchange medium, for example, a liquid. ), And a plate (1) provided with a gasket (6) so as to communicate with the two passage holes (4) and (5) and close the other passage holes (2) and (3). As shown in FIG. 4B, on the contrary, the gasket (4) communicates with the passage holes (2) and (3) and closes the other passage holes (4) and (5). 6) is mounted on the plate (1 ').

In order to form a plate heat exchanger using the plates (1) and (1 '), as shown in FIG.
(1 ') are alternately laminated, and each plate (1)
Between (1 ′), a first flow path (a) through which one heat exchange medium flows, and a second flow path (b) through which the other heat exchange medium flows
Are alternately formed, and the passages (a) and (b) are provided at the four corners of each plate (1) (1 ′) with passage holes (2) and (3).
(4) By communicating with two of (5), respectively, a plate heat exchanger is constituted. Then, at the time of heat exchange, by flowing a heat exchange medium through each of the first flow path (a) and the second flow path (b), both the heat transfer surfaces (1a) of the plates (1) and (1 ') The heat exchange is performed via (1a ').

[Problems to be solved by the invention]

When heat is exchanged by the above-described plate heat exchanger, the properties of the heat exchange medium supplied to the first flow path (a) and the second flow path (b) are generally different, For these different media, different materials may be required for the material of the gasket (6) used for the plates (1) and (1 '). For example, when one heat exchange medium is water, a material that does not require corrosion resistance may be used, but when the other heat exchange medium is a chemical solution such as sulfuric acid, corrosion resistance is required, and an expensive gasket (6) is required. is there. However, as shown in FIGS. 4 and 5, the gasket (6) mounted on the plates (1) and (1 ') has a portion where one medium flows,
That is, a first surface integrally surrounding the heat transfer surface (1a) or (1a ') and two of the four passage holes (2), (3), (4), and (5) that communicate with the heat transfer surface. And a second gasket portion (6b) surrounding the location where the other medium flows, that is, the remaining two passage holes, and both are integrally formed by molding. Since the first gasket part (6a) and the second gasket part (6b) are formed at the same time, they are made of the same material. That is, the first gasket (6) interposed between the plates (1) and (1 ')
The two types of media come into contact with the second gasket portions (6a) and (6b) one by one, and both are formed of the same material. Therefore, the properties of the two heat exchange media are different, only one of the media requires the gasket (6) to have corrosion resistance, and the other does not require the gasket (6) to have corrosion resistance. However, all the gaskets (6) must be formed of an expensive material having corrosion resistance, and as a result, there is a problem that the cost of this type of plate heat exchanger is increased.

[Means for solving the problem]

In order to solve the above problem, the present invention has a heat transfer surface,
A gasket interposed between the plates to constitute a plate heat exchanger in which a plurality of plates having passage holes at the corners are laminated and the first and second flow paths are alternately formed between the plates. A first gasket portion integrally surrounding the heat transfer surface of the plate and two passage holes communicating with the plate, and a second gasket portion surrounding the remaining two passage holes. The two types of master gaskets formed integrally with each other are formed of different materials, and the first and second gasket portions of the two types of master gaskets are cut at the connection portions to form a first gasket portion and a second gasket portion. Two types of gaskets are constructed by alternately interposing gaskets with different materials by combining materials of different materials.

[Operation] Since the present invention is configured as described above, two types of gaskets made of different materials are prepared, and the first gasket portion and the second gasket portion are cut at the connection portions thereof to form different gaskets. Because it is a combination of two things, there is no place to throw away two types of gaskets of different materials,
Both can be used fully and are economical, of course,
Durability and corrosion resistance to two types of fluids can be provided.

〔Example〕

FIGS. 1A and 1B show a gasket (1) according to the present invention.
0) and (10 ') are mounted on the plates (1) and (1'). In FIG. 1 (A), (10a)
A first passage for integrally surrounding the heat transfer surface (1a) of the plate (1) and the passage holes (4) and (5) communicating therewith to form a first flow passage (a). Gasket part, (10b)
Is a second gasket portion for surrounding the remaining passage holes (2) and (3) of the plate (1) and forming a second flow path (b). In FIG. 1 (B), (10a ′) is
The first heat transfer surface (1a ') of the plate (1') and the passage holes (2) (3) communicating therewith are integrally surrounded to form a second flow passage (b). Gasket, (10
b ') is the remaining passage hole (4) in the plate (1')
(5) surrounding the second channel (b) for forming the second channel (b)
Of the gasket. The above gasket (10) (10 ')
The first gasket portions (10a) (10a ') and the second gasket portions (10b) (10b') are formed separately from each other. That is, a connection portion (11) (11 ') between the first gasket (10a) (10a') and the second gasket (10b) (10b ').
To join each other. The first gasket portion (10a) of the gasket (10) and the second gasket portion (10b ') of the gasket (10') are connected to the heat exchange medium supplied into the first flow path (a). Formed of a material suitable for the characteristics of the gasket (10),
Of the gasket part (10b) and the first of the gasket (10 ')
The gasket portion (10 ') is formed of a material suitable for the property of the heat exchange medium supplied into the second flow path (b).

As shown in FIG. 3, the method of manufacturing the gaskets (10) and (10 ') is as follows: the first gasket is made of only a material suitable for the heat exchange medium supplied to the first flow path (a). A master gasket (15) and a second master gasket (16) made of only a material suitable for the heat exchange medium supplied to the second flow path (b) are prepared.
5) (16) to the first gasket part (15a) (16
a) and the second gasket part (15b) (16b)
7) Cut at (18). Then, when forming the gasket (10), the first master gasket (15)
Gasket (15a) and the second master gasket (1
The gasket (10) is formed by bonding the second gasket portion (16b) of (6) on the plate (1). When the gasket (10 ') is formed, the first master is used. The second gasket part (15) of the gasket (15)
b) and the first gasket portion (16a) of the second master gasket (16) are rotated on the plate (1 ') by 180 ° from the state of FIG.
A gasket (10 ') is formed.

The gasket (10) (10 ') formed as described above is mounted on the plate (1) (1'), and the plate (1)
As shown in FIG. 2, a plurality of (1 ') s are alternately stacked to form a plate heat exchanger having a first flow path (a) and a second flow path (b). For example, when sulfuric acid is supplied to the first flow path (a) and water is supplied to the second flow path (b), the first gasket portion (10a) of the gasket (10) in contact with the sulfuric acid is Only the second gasket portion (10b ') of the gasket (10') is formed of an expensive material having corrosion resistance, and the second gasket portion (10b) of the gasket (10) which comes into contact with water and the gasket (10 '). If the first gasket portion (10a ') is formed of a normal material, it is possible to minimize the use of expensive materials having corrosion resistance.

〔The invention's effect〕

As described above, the present invention provides a gasket used in a plate heat exchanger in which the first gasket portion in contact with one heat exchange medium and the second gasket portion in contact with the other heat exchange medium are made of different materials. By forming by
When the properties of the two types of heat exchange media supplied to the plate heat exchanger are different, the portions of the gasket that come into contact with both media can be formed of materials suitable for the respective media. Therefore, when sulfuric acid is used for one medium and water is used for the other medium, all the gaskets used in the plate heat exchanger are conventionally used.
There is no need to form the gasket with an expensive material that can withstand sulfuric acid, and only the portion of the gasket that contacts the sulfuric acid needs to be formed with an expensive material. Therefore, the cost of the plate heat exchanger using this gasket can be reduced. . In particular, the present invention creates two types of gaskets of different materials, each with a first gasket part and a second gasket part.
The gasket part is cut at the connection part, and the two parts made of different materials are combined. Therefore, two types of gaskets made of different materials have no place to be discarded, and both can be used completely, and it is economical. Of course, it is possible to provide durability and corrosion resistance to two types of fluids.

[Brief description of the drawings]

1 (A) and 1 (B) are plan views showing a state in which a gasket according to the present invention is mounted on a plate, FIG. 2 is an exploded perspective view of a plate heat exchanger using the gasket according to the present invention, 3 (A) and 3 (B) are plan views showing a master gasket for obtaining a gasket according to the present invention, and FIGS. 4 (A) and 4 (B) are plan views showing a state where a conventional gasket is mounted on a plate. FIG. 5 is an exploded perspective view of a plate heat exchanger using a conventional gasket. (1) (1 ') ... plate, (1a) (1a') ... heat transfer surface, (2) (3) (4) (5) ... passage holes, (10) (10 ') ... ... gasket, (10a) (10a ') ... first gasket part, (10b) (10b') ... second gasket part, (a) ... first flow path, (b) ... 2 channel.

Claims (1)

(57) [Claims] 1. A plate type heat exchanger comprising a plurality of plates having a heat transfer surface and a plurality of plates having passage holes at four corners, and first and second flow paths alternately formed between the plates. A gasket interposed between the plates, a first gasket portion integrally surrounding the heat transfer surface of the plate and two passage holes communicating therewith, and the remaining two passages Two types of master gaskets are formed of different materials by integrally connecting a second gasket portion surrounding the use hole with a connecting portion, and the first and second gasket portions of the two types of master gaskets are connected to the connecting portion. A plate-type heat exchanger characterized in that the first gasket portion and the second gasket portion are cut from each other and two types of gaskets are alternately interposed between the respective plates by combining different materials of the first gasket portion and the second gasket portion. Exchanger gasket G.