Washerless bolt head seal for compressor housing

Details Washerless bolt head seal for compressor housing Washerless bolt head seal for compressor housing

1996-09-04

1999-03-09

Sewell, Paul T.

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

294071, 2952511, 411369, 411370, 411181, B23P 1100, F16B 3300

Patent

active

058784888

ABSTRACT:
A compressor housing is sealed around the bolt head without the use of an intervening sealing washer. Instead, the bolt hole is machined through the compressor housing in such a way as to assure that the sharp circular edge of the bolt hole always has a degree of radial overlap with the rounded corner that makes the transition from the body of the bolt to the flat undersurface of the bolt. Then, when the bolt is tightened, it is assured that the sharp corner of the bolt hole will be hit and be rounded over by the rounded corner of the bolt head into a closely matching configuration. This assures good, close contact and a tight gas seal. It also allows for over tightening the bolt head, because the ideal sealing pressure will still be attained at some point moving radially inwardly along the interface between bolt head round corner and the deformed bolt hole edge.

REFERENCES:
patent: 3571903 (1971-03-01), Persson
patent: 4304039 (1981-12-01), Asmus
patent: 4966512 (1990-10-01), Takaku
patent: 5141375 (1992-08-01), Pollizzi
patent: 5230137 (1993-07-01), Abe
patent: 5256019 (1993-10-01), Phillips, II

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