Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1985-01-24
1987-01-13
Shoap, Allan N.
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165166, 277181, 277189, 4034051, F28F 310
Patent
active
046357157
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a gasket arrangement comprising a gasket which is intended to be applied into a groove made along an edge of a heat exchanger plate and which on its side directed to the mentioned edge is provided with projections arranged at a distance from each other--seen in the longitudinal direction of the gasket--which projections are made in one piece with the gasket and arranged to hold the gasket in the groove, the projections cooperating with a holding part.
Such a gasket arrangement is described in the Swedish Pat. No. 421.241 (corresponding U.S. Pat. No. 4,377,204). According to this known arrangement there has been made a hole in the heat exchanger plate right in front of each projection of the gasket. This known gasket arrangement due to the mentioned holes leads to an essential increase in prices regarding the tools for the plate production and has not come into practical use to any great extent.
Another known gasket arrangement is based on the fact that the gasket groove of the heat exchanger is made with a dovetail formed or a similar cross section, whereby a gasket having essentially the same cross section, after having been applied into the groove, can be held on the plate without special fastening means. This gasket arrangement requires still more expensive tools for the plate production than the first-mentioned, known gasket arrangement.
As a consequence of the drawbacks with the above described gasket arrangements these ones have only to a little extent replaced the conventional method, known since long, of fastening gaskets to heat exchanger plates, i.e. to glue the gaskets into the gasket grooves of the plates. This method, however, has a great deal of practical disadvantages as has been stated in the above mentioned Swedish patent.
The purpose of the present invention is to bring about a new gasket arrangement which is not connected with the drawbacks with the above mentioned gasket arrangements but which still makes the manufacture of gaskets possible in until now a usual way without essential increase in price of necessary equipment for the manufacture.
This purpose is achieved by means of a gasket arrangement of the common kind mentioned by way of introduction comprising a gasket with projections on its side directed to the edge of the heat exchanger plate, which gasket arrangement is characterized in that the holding part comprises at least one projection that is directed to the gasket and is positioned at a distance from the gasket projection seen in the longitudinal direction of the gasket, and besides that the gasket projection and the projection are made in that way that when the gasket is in place in the groove on the one side of the heat exchanger plate, the gasket projection is on the same side but the projection is on the opposite side of the heat exchanger plate.
The invention shall be more closely described in the following with reference to the accompanying drawings, in which
FIG. 1 shows a part of a gasket intended to be included in a gasket arrangement according to the invention,
FIG. 2 shows a cross section view along the line II--II of FIG. 1,
FIG. 3 shows a part of a heat exchanger plate with a gasket according to FIG. 1 applied into a gasket groove,
FIG. 4 shows a cross section along the line IV--IV of FIG. 3,
FIG. 5 shows a part of a gasket according to a modified embodiment,
FIG. 6 shows a part of a heat exchanger plate with a gasket provided with a holding part according to another embodiment,
FIG. 7 shows a cross section along the line VII--VII of FIG. 6, and
FIG. 8 shows a similar cross section as in FIG. 7 but taken from a slight modified embodiment.
In FIG. 1 a part of a gasket 1 is disclosed that has a projection 2 made in one piece with the gasket so as to form an integral element. There are similar projections on several places along the gasket (not shown).
At a distance from the gasket 1 itself the gasket projection 2 carries two other projections 3 and 4, the free ends of which are directed towards the gasket 1. The projections 3 and 4 are
REFERENCES:
patent: 1648408 (1927-11-01), Kumagai
patent: 2550339 (1951-04-01), Ehrman
patent: 2938252 (1960-05-01), Scheemaeker
patent: 3195625 (1965-07-01), Thomson
patent: 4377204 (1983-03-01), Johansson
patent: 4432415 (1984-02-01), Wright
Alfa-Laval Thermal AB
Hapgood Cyrus S.
Shoap Allan N.
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