Pumps – Expansible chamber type – Having separate noncyclic valve
Patent
1987-09-17
1989-04-18
Freeh, William L.
Pumps
Expansible chamber type
Having separate noncyclic valve
418 15, F04B 4900, F04C 204
Patent
active
048222607
ABSTRACT:
A device for controlling a rotating-piston machine in which inner and outer rotors rotate at unequal speeds and profiled teeth thereon form gaps to define working chambers which move, with change of volume, from an inlet region to an outlet region of the machine. The device comprises a body having a feed channel for a working fluid, a plurality of supply channels which open into the inlet region and two rotary slide valves for controlling communication between the feed channel and the supply channels to fill the working chambers during development of suction therein upon rotation of the rotors. The body has two round cutouts each containing a respective rotary slide valve. One slide valve controls supply of fluid at the beginning of development of suction in each working chamber whereas the other slide valve controls supply fluid at the end of development of suction in each working chamber. Each cut-out is connected to the feed channel and to respective associated pluralities of supply channels.
REFERENCES:
patent: 3120814 (1964-02-01), Mueller
patent: 3327636 (1967-06-01), Purcell
patent: 4028023 (1977-07-01), Labos
patent: 4723895 (1988-02-01), Hayase
Baumgartner Hans
Brandstadter Manfred
Heikrodt Klaus
Henke Ulrich
Schneider Herbert
Freeh William L.
Pierburg GmbH
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