Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent
1982-11-24
1984-04-17
Smith, Leonard E.
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
418 98, 308215, F01C 116, F03C 200, F04C 2902
Patent
active
044431708
ABSTRACT:
The invention relates to an arrangement at oil-injected screw compressors for high pressures. The arrangement is characterized in that the length/diameter ratio of the rotors is lower than 1,3:1, that taper roller bearings in pairs (19-21) are used at both shaft ends (15-18) of the rotors, that the bearings (19,21) at the high-pressure end (13) of the rotors are arranged so that the wider edges of the inner rings of the bearings are facing toward each other and are capable to take up both radial and axial forces, that the bearings (20,22) at the low-pressure end (14) of the rotors are arranged so that the narrower edges of the inner rings of the bearings are facing toward each other and are capable to take up only radial forces, and that oil-pressure actuated balancing pistons (23,24) are provided at the shaft ends (16,18) on the low-pressure end of the rotors to take up the major part of the axial forces initiated by the compressor.
REFERENCES:
patent: 2578196 (1951-12-01), Montelius
patent: 3241744 (1966-03-01), Schibbye
patent: 3462072 (1969-08-01), Schibbye
patent: 3947078 (1976-03-01), Olsaker
Englund Rolf A.
Schibbye Lars L. B.
Obee Jane E.
Smith Leonard E.
Sullair Technology AB
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