Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1988-04-21
1989-07-18
Jones, Larry
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165164, 165166, 277206R, F28F 308
Patent
active
048484512
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a plate heat exchanger comprising heat exchange plates mounted between a frame plate and a pressure plate, the frame plate and the pressure plate having ports lined with linings for intake and outtake of media that shall be heat exchanged, and the heat exchange plates having ports in alignment with corresponding ports in the frame plate and the pressure plate round which ports of the heat exchange plates there extend ring gasket grooves, each ring gasket groove having a rear side and a front side, the front side of the groove being that one where the ring gasket is intended to be placed.
A plate heat exchanger, normally seen, comprises a frame plate, a pressure plate and between these ones heat exchange plates all of which are mounted in a frame. The heat exchange plates and, as a rule, also the frame plate and the pressure plate are provided with openings in their corners which function as ports for intake and outtake of the media that are to be heat exchanged. In this connecton the frame plate and the pressure plate, as a rule, have been provided with special linings in the ports for being able to resist corrosive media.
In the applicant's own international publications WO 84/00060 and WO 84/01209 are shown linings for the ports in a frame plate or a pressure plate of a plate heat exchanger which linings have such a design that machining of the frame plate or the pressure plate at the area of the ports does not need to be made. If accordingly the ports in a frame plate are provided with linings according to some one of the mentioned patent publications, the plate package shall be so arranged in the heat exchanger that the face of the plates being provided with gaskets is directed to the frame plate. This means that the heat exchange plate being closest to the pressure plate has its rear side directed to the pressure plate.
In order to solve the problem with the sealing between the pressure plate and the closest heat exchange plate it has previously been necessary to machine the pressure plate at the areas of its ports, whereafter the ports have been provided with a thick lining of rubber, metal or the like, which lining has been provided with a shoulder for sealing against the rear side of the ring gasket groove of the heat exchange plate. This sealing method is apparent from FIG. 1.
The great drawback with this method is that the machining of the pressure plate has partly been very expensive, partly required special machining tools, alternatively advanced working machines.
Therefore, there has been a desire to solve the mentioned sealing problem without needing to machine the pressure plate. This desire has been accentuated lately by the presence in the market of the inventions described in the two above-mentioned publications which as has been mentioned disclose solutions for lining the ports in a frame plate or a pressure plate without machining of the plate at the area of the ports. In this connection it ought to be said that if the linings according to WO 84/00060 or WO 84/01209 should be inserted into the ports in a pressure plate, the sealing problems would instead arise between the frame plate and the adjacent heat exchange plate depending on the fact that the rear side of the gasket groove of the heat exchange plate would be directed towards the frame plate. Thus, the present invention is suitable to use in either a frame plate or a pressure plate depending on how the heat exchange plates are directed in the plate heat exchanger.
This invention intends to solve the problems described above. This has been made possible by a plate heat exchanger of the kind mentioned by way of introduction, having the characterizing features mentioned in the claims.
The invention shall be described more closely in connection with the accompanying drawings, in which
FIG. 1 shows known technique and
FIGS. 2-9 show different embodiments of the invention,
FIGS. 10, 11 show two embodiments regarding the lining of ports in a separation plate inside a plate heat exchanger and
FIG. 12 shows a lin
REFERENCES:
patent: 2203123 (1940-06-01), Astle
patent: 4432415 (1984-02-01), Wright
patent: 4586562 (1986-05-01), Carlson et al.
patent: 4595208 (1986-06-01), Jonsson et al.
Jonsson Nils-Ake
Nilsson Bo Goran
Persson Hans-Lennart
Alfa-Laval Thermal AB
Jones Larry
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