F - Mech Eng,Light,Heat,Weapons – 04 – C
Patent
F - Mech Eng,Light,Heat,Weapons
04
C
230/97
F04C 18/08 (2006.01) F04C 23/00 (2006.01)
Patent
CA 1196615
! GEROTOR VACUUM PUMP David E. Hanson ABSTRACT OF THE DISCLOSURE 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 opera- tion to draw oil through passageways which communicate between an oil reservoir and the pumping chamber. ! !
376422
Osler Hoskin & Harcourt Llp
Sargent-Welch Scientific Company
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