Rotary expansible chamber devices – Multistage – Interengaging rotary members
Patent
1984-01-23
1985-05-28
Vrablik, John J.
Rotary expansible chamber devices
Multistage
Interengaging rotary members
418100, 418171, 417 32, F04C 1810, F04C 2502, F04C 2702
Patent
active
045197555
ABSTRACT:
A unique gerotor-type pump is disclosed for pumping gases. The pump has an inner gear-type rotor mounted within and rotating off-center with respect to an outer gear-type rotor ring, about a parallel axis. Surfaces of the teeth of the inner rotor are in continuous contact with the outer rotor to define at least one pumping chamber which alternately expands and contracts as the inner and outer rotors turn. An elongated inlet port is positioned to communicate with the pumping chamber during a substantial portion of the cycle when the pumping chamber is expanding, (the intake cycle) and an outlet port is positioned to communicate with the pumping chamber only just prior to and at the end of the contraction or exhaust cycle. Oil for sealing and lubricating between moving parts of the pump is provided by employing differential pressure created by the pump's own operation to draw oil through passageways which communicate between an oil reservoir and the pumping chamber.
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Sargent-Welch Scientific Company
Vrablik John J.
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