Heat exchange – Covered access opening – Heating or cooling means within the covered chamber
Patent
1988-08-30
1989-10-03
Cohan, Alan
Heat exchange
Covered access opening
Heating or cooling means within the covered chamber
165167, F28F 900
Patent
active
048710130
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a plate heat exchanger comprising several heat exchange plates arranged between two end plates, at least one of which has through-ports and a side surface facing the heat exchange plates and beingunmachined around the ports, at least oen of said ports being provided with a cover preventing through-flow. The expression "unmachined" is intended to mean that the end plate in question has no conventional recesses around the ports for housing of, as an example, gaskets, linings or closing devices when the ports should be closed.
It is previously known to prevent through-flow of a port in a plate heat exchanger. As an example, a recess of the above mentioned kind can be used to house a relatively thick plate covering the port.
Lately new types of end plates have been developed, however, which are unmachined around the ports and thus have no recesses of the above mentioed kind. It has in these cases been regarded as impossible to cover a port by means of a thick plate on the inside of the end plate, as an adjacent heat exchange plate would then loose an essential part of its support against the end plate. It has also been considered too expensive to machine the end plate around the port to provide a recess for such a thick plate. Instead, a body filling out the port has been placed therein and fixed by means of a relatively thick plate covering the port at the outside of the end plate. The disadvantages of this are that it requires machining of the one side of the end plate and special working moments to fasten the plate. Further, said body increases the total weight of the plate heat exchanger, and production and handling of the body means an undesired expense.
The object of the present invention is to eliminate the problems existing with the above described known technqiue and to provide a device which at a low cost and in a simple manner makes it possible to prevent through-flow of ports in unmachined end plates.
This is achieved according to the invention in a plate heat exchanger of the initially described kind, which mainly is characterized in that said cover is applied aginst the side surface of the end plate facing the heat exchange plates, and comprises at least two cooperating parts, a first thin part abutting said side surface and a second thick part mainly placed within and essentially covering said port, said first part being dimensioned to withstand shearing forces, and said second part being dimensioed to withstand bending forces acting on the cover as a result of an internal pressure in the plate heat exchanger.
By the present invention it has thus proved possible to provide an end plate, which is unmachined around the ports, with a cover applied from the inside of the plate heat exchanger, in order to prevent through-flow of a port. The cover is cheap to produce and simple to apply.
The invention will be described more in detail in the following with reference to the accompanied drawings in which
FIGS. 1 and 2 are cross section views of parts of end plates, each comprising a port being covered by a cover according to prior art technique.
FIG. 3 is a cross section view of a part of an end plate comprising a port covered by a cover in accordance with the present invention, and
FIGS. 4-6 are cross section views of three alternative embodiments of a cover in accordance with the present invention.
According to FIG. 1 an end plate 10 is provided with a port 11, extending through the plate, and with recesses 12, 13 in both side surfaces of the plate at the area of the port. Such recesses have previously been ordinary for end plates, at least when a corrosive medium has flowed through the heat exchanger and it has been necessary to provide the ports with linings to protect the end plate against the corrosive medium. In case that the heat exchange medium should not flow through a port 11, a reltively thick plate 14 is applied in the recess 13 at the side surface of the end plate 10 facing a heat exchange plate to cover the port 11 in question. The plate 14 is thick enough
REFERENCES:
patent: 4387765 (1983-06-01), Kristoffersson
Andersson Torgny
Nilsson Bo G.
Alfa-Laval Thermal AB
Cohan Alan
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