Rotary expansible chamber devices – With mechanical sealing – Axially movable end wall or end wall portion
Patent
1976-10-14
1978-03-14
Vrablik, John J.
Rotary expansible chamber devices
With mechanical sealing
Axially movable end wall or end wall portion
F01C 1908, F03C 300, F04C 1500
Patent
active
040788725
ABSTRACT:
Disclosed is a pressure loaded gear pump wherein two assemblies each consisting of a pair of abutted bushings are axially slidably fitted into a casing on both sides of a pair of intermeshing impeller gears for supporting rotatably the shafts thereof and for sealing the side faces of the gears; and defined on each side of the casing between the pair of abutted bushings and an end plate are a low pressure chamber into which is admitted the hydraulic pressure in a suction opening, a high pressure chamber into which is admitted the hydraulic pressure in a discharge opening and two moderate pressure chambers each of which is communicated with a sector between the suction opening and the pressure transition or gradient sector of the liquid passage from the suction to discharge openings. The effective area of each moderate pressure chamber is equal to or slightly greater than the cross sectional area of the space between the teeth of the gears. Under the pressures acting on the bushings in the high, moderate and low pressure chambers, the bushings are optimumly pressed against the side faces of the impeller gears independently of the rotational speed and the temperature of liquid being handled, whereby the very effective sealing may be attained and not only the generation of operational noise but also wear of rubbing surfaces of the bushings and gears may be minimized.
REFERENCES:
patent: 2742862 (1956-04-01), Banker
patent: 2842066 (1958-07-01), Hilton
patent: 3539282 (1970-11-01), Forschner
patent: 3833319 (1974-09-01), Eglington
patent: 3961872 (1976-06-01), Muller et al.
Jecies Saul
Kayabakogyokabushikikaisha
Vrablik John J.
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