Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1984-05-07
1986-06-17
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
165167, F16J 1500
Patent
active
045952086
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a lining of non-metallic material for lining of inlet ports and outlet ports of a frame plate and/or a pressure plate of plate heat exchangers and comprising a cylindrical part and at least one but preferably two flanges which at the use of the lining are positioned on each side of the frame plate and/or the pressure plate.
A plate heat exchanger comprises a number of heat exchanger plates which are fastened between a frame plate and a pressure plate. In the frame plate and/or the pressure plate there are made inlet ports and outlet ports for the heat exchanging media. In these inlet ports and outlet ports there are often linings inserted which can be made of different materials. The insertion of such linings implies that the frame plate and/or the pressure plate will not come into contact with the heat exchanging medium which can be corrosive. Due to that fact the frame plate and/or the pressure plate can be made of a cheap material.
The use of conventional linings, however, has involved machining of the inlet ports and the outlet ports of the frame plate and/or the pressure plate, because the thickness of the flange of the lining has been so large that without machining in the form of recesses round the inlet ports and the outlet ports of the frame plate and/or the pressure plate the flange should have encroached too much upon the structural measure of the heat exchanger. Moreover, problems should have arisen regarding the contact between a heat exchanger plate and the frame plate and/or the pressure plate.
The British Pat. No. 1.041.805 discloses a lining that is made of an elastic material and that is intended to be inserted into an inlet port or an outlet port of a frame plate or a pressure plate. The lining comprises a cylindrical part having a flange in each end. In this connection the flange that is intended to rest against the heat exchanger plate is so thick that machining in the form of a recess round the inlet ports and the outlet ports has had to be done in the frame plate. Such a machining is both expensive and time-consuming.
German patent publication No. 23 57 059 also discloses a lining made of an elastic material for use in a plate heat exchanger.
In FIG. 3 of the patent publication there is shown a schematic sketch of the position of the lining in a frame plate. In this case a relatively thick flange of the lining has been outlined between the frame plate and the first heat exchanger plate, the frame plate appearing to be unmachined. This will, however, probably depend on the fact that the drawing is of a schematical nature, because the apparatus according to the drawing would hardly function with such a large distance between the frame plate and the heat exchanger plate.
That the drawing only shows a schematical and not a realistic picture of the apparatus is clear from the specification, which states that for increasing the sealing effect a recess for the flange of the lining should be done in the frame plate. That means that this patent publication discloses an apparatus that is impaired by the same problems as that according to the British Pat. No. 1.041.805.
This invention intends to remove the problems that are connected with known technics. This is made possible by the fact that the flange that is positioned between the frame plate and/or the pressure plate on one hand and a heat exchanger plate on the other hand is made so thin that it does not require recesses round the inlet ports and the outlet ports of the frame plate and/or the pressure plate, and that the flange is provided with a bulge, which functions as a seal between the heat exchanger plate on one hand and the frame plate and/or the pressure plate on the other hand.
A preferred embodiment of the invention shall be described more closely in connection with the accompanying drawings, in which:
FIG. 1 is a section through a lining divided into halves;
FIG. 2a-c disclose different connections between the one flange of the lining and the flange of a connecting tube.
FIG. 3 is a perspective view of
REFERENCES:
patent: 2191044 (1940-02-01), Seligman
patent: 2790627 (1957-04-01), Wakeman
patent: 3908717 (1975-09-01), Rademacher et al.
patent: 4201393 (1980-05-01), Kawashima et al.
Jonsson Nils A.
Mossberg Bengt
Alfa-Laval AB
Hapgood Cyrus S.
Smith Robert I.
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