Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1996-11-04
1999-11-23
Leo, Leonard
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165167, 277652, F28F 310
Patent
active
059882689
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a plate type heat exchanger used in the food industry and pharmaceutical industry where in mounting plate type heat exchanger gaskets on the plates, the use of an adhesive agent, such as a synthetic rubber type adhesive agent or viscous tape should be avoided and in the general chemical industry where enhanced operability in the replacement and maintenance of gaskets is desired.
BACKGROUND ART
Generally, the plate type heat exchanger comprises a plurality of plates laminated through gaskets to form a plurality of passages defined between said plates, wherein two different fluids are passed through said passages to effect heat exchange between said fluids through the plates.
The plate 1 used in the plate type heat exchanger, as shown in FIG. 21, comprises a rectangular flat plate having a heat transmitting surface formed with a suitable uneven pattern (not shown), fluid passage holes 3 formed at the four corners, a gasket groove 4 formed in the periphery of the heat transmitting surface and in a region which surrounds the fluid passage holes 3, and a gasket 5 fitted in said gasket groove.
In this connection, in the case of a plate type heat exchanger handling organic solvents in the chemical and pharmaceutical industries, use is made of a resin-covered gasket 5, as shown in FIG. 22, which comprises an elastic core 5a of elastic material, such as synthetic rubber, whose side which comes in contact with the liquid is covered with a corrosion-resistant resin cover 5b of U-shaped cross section.
Conventionally, the mounting of said resin-covered gasket 5 on the plate 1 is effected by bonding it to the flat region of the gasket groove 4 by an adhesive agent 6, such as a synthetic rubber type adhesive agent or viscous tape.
However, if the resin-covered gasket 5 is mounted on the plate 1 by the adhesive agent 6, long-term use results in permeation of the organic solvent or the like into the bonded surface of the resin-covered gasket 5, dissolving and deteriorating the adhesive agent 6, mixing impurities into the liquid, leading to the disadvantage of lowering the quality of the treating liquid.
Further, if the sealing property lowers due to the dissolution and deterioration of the adhesive agent, the liquid seeps through the flat region of the gasket groove 4 into the core 5a which lacks resistant to corrosion, thus corroding and decomposing the core 5a, leading to another problem that the sealing property is further degraded.
Further, when the resin-covered gasket 5 is to have its cover renewed, it is necessary that in order to fully retain the sealing property, the old adhesive agent 6 adhering to the flat region of the gasket groove 4 be completely removed with the utmost care; thus, much labor is involved and the operating efficiency in maintenance is very low.
DISCLOSURE OF THE INVENTION
The present invention, which has been accomplished with the above problems in mind, is intended to provide a plate type heat exchanger wherein the resin-covered gasket can be mounted on the plate without using any adhesive agent.
To achieve the above object, the invention provides a plate type heat exchanger comprising a plurality of laminated plates each formed with a gasket groove surrounding the heat transfer surface with a gasket fitted therein, said gasket comprising a core of elastic material and a corrosion-resistant resin cover covering that side of the core surface which comes in contact with the liquid, said exchanger being characterized in that the opposite side, or liquid-noncontacted side, of said core surface is integrally formed with a fixing element and the peripheral edge of said plate is formed with a recess adapted to fit on said fixing element.
By fitting the fixing element of the resin-covered gasket in the recess of said plate, the resin-covered gasket can be mounted on the plate without using any adhesive agent.
According to the invention, the resin-covered gasket can be mounted on the plate without using any adhesive agent and the liquid-contacted
REFERENCES:
patent: 2580546 (1952-01-01), Hobson, Jr.
patent: 3322433 (1967-05-01), Rentschler
patent: 4915355 (1990-04-01), Fort
patent: 5178212 (1993-01-01), Nakamura
Kusunoki Kenji
Usami Toshiya
Hisaka Works Limited
Leo Leonard
LandOfFree
Plate type heat exchanger does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Plate type heat exchanger, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plate type heat exchanger will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1210281