Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Reexamination Certificate
1999-10-15
2001-09-18
Rosenbaum, I Cuda (Department: 3743)
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
C029S890054
Reexamination Certificate
active
06289584
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method in the manufacture of a plate heat exchanger, preferably a so-called recuperator, with flow channels arranged between the plates, every other channel being designed to accommodate the flow of a heat-emitting medium and every second channel the flow of a heat-absorbing medium and the flow channels for one of the media, preferably the heat-absorbing medium, being connected in parallel to manifolds for the said medium, the plates having a raised pattern designed to produce a counter-flow section and two cross-flow sections in the recuperator, one on either side of the cross-flow section, and the cross-flow sections having a lower raised pattern height than the counter-flow section.
DESCRIPTION OF RELATED ART
With regard to the prior art, reference is made, among other things, to U.S. Pat. No. 5, 555,933 and to SAE Technical Paper series 851254 “Development, Fabrication and Application of a Primary Surface Gas Turbine Recuperator” E.C Parsons, Solar Turbines Inc, San Diego, Calif, Govemment/Industry Meeting 2 Exposition, Washington D.C, 20-23, May 1985.
The above-mentioned publications described how the heat-absorbing medium is made to flow in a zigzag by the relatively lower raised pattern height prevailing in the cross-flow section, compared to the counter-flow section. The different raised pattern heights were produced by deformation in the cross-flow areas of plate patterns pressed gradually undulation by undulation to the same height, leaving the original raised pattern height in the counter-flow area. The manifolds were made as separately formed elements connected to the plates.
SUMMARY OF THE INVENTION
The object of the present invention is to achieve a relatively simplified method of manufacture of the type outlined above. According to the invention this is achieved in that openings are made in each plate by a punching and pressing operation, with side walls formed around the edges of the openings, the said side walls, following a joining process in which they undergo pressure resistant jointing, forming the manifolds, and that the entire raised patterns for the counter-flow section and the cross-flow sections on each plate are pressed to their respective raised pattern height in the said pressing operation.
REFERENCES:
patent: 4434634 (1984-03-01), Almqvist et al.
patent: 4592414 (1986-06-01), Beasley
patent: 4600053 (1986-07-01), Patel et al.
patent: 4846268 (1989-07-01), Beldam et al.
patent: 4915163 (1990-04-01), Matsunaga et al.
patent: 5184673 (1993-02-01), Hedman et al.
patent: 5555933 (1996-09-01), Darragh et al.
patent: 0 460 872 (1991-05-01), None
patent: 0 736 346 (1996-10-01), None
patent: 2 107 845 (1983-05-01), None
patent: 95/17272 (1995-06-01), None
5/85 “Development, Fabrication and Application of Primary Surface Gas Turbine Recuperator” Parsons, SAE Technical Paper Series 851254.
Altera Law Group LLC
Cuda Rosenbaum I
Volvo Lastvagnar AB
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