Rotary expansible chamber devices – Interengaging rotating members – Three or more
Patent
1996-06-20
1999-08-10
Freay, Charles G.
Rotary expansible chamber devices
Interengaging rotating members
Three or more
418150, 4182011, F01C 108
Patent
active
059348917
ABSTRACT:
The screw pump (1) has a driving screw (6) and at least one side screw (7), which are placed in a screw channel (5) in the pump body (2), between a suction space (3) and a pressure space (4). At least one of the clearances between the surfaces of the driving screw, side screws and screw channel is larger in the areas close to the suction and pressure spaces than the corresponding clearance in the middle portion of the pump channel. The magnitude of the clearances is so fitted that the total leakage flow (V) between the suction and pressure spaces through the clearances is substantially the same for all angles of rotation of the screws (6,7). Preferably the clearance fit is achieved by reducing the diameter of the screw at its ends so that the change in the external diameter of the reduced portion has at least two different values.
REFERENCES:
patent: 2165963 (1939-04-01), Curtis
patent: 2652192 (1953-09-01), Chilton
patent: 2922377 (1960-01-01), Whitfield
patent: 3086474 (1963-04-01), Sennet
patent: 4018549 (1977-04-01), Segerstrom
patent: 5051077 (1991-09-01), Yanagisawa et al.
patent: 5123821 (1992-06-01), Willibald et al.
patent: 5350286 (1994-09-01), Kisi et al.
Freay Charles G.
Kone OY
Tyler Cheryl J.
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