Rotary expansible chamber devices – Unlike helical surfaces on relatively wobbling rotating...
Patent
1988-03-24
1990-05-08
Vrablik, John J.
Rotary expansible chamber devices
Unlike helical surfaces on relatively wobbling rotating...
418153, 418161, 418183, F04C 2102, F04C 500
Patent
active
049233769
ABSTRACT:
An arrangement for an improved Moineau pump, i.e., a progressing cavity pump with a helical gear pair, wherein the closed end outer gear rotates and orbits relative to a nonrotating hollow inner gear. A hollow inner gear comprising an internal chamber extending axially allows the flow of pumpable material from progressing cavities to the closed end and through the hollow inner gear. The integral and smooth construction of the outer gear and the closed end eliminate contamination sites and further eliminate the need for seals or flexing components which contact the pumpable material. The hollow inner gear can be manufactured to integrally connect to a discharge conduit. The improved pump presented herein can be used within a material containment vessel, and the invention can be positioned to avoid contact of the pumpable material with any rotating couplings. An alternative embodiment presents a closed end outer gear with an internal chamber for use of a pressurized fluid distinct from the pumpable material. Means for connecting the improved Moineau pump to pump body is further provided. An orbital assembly allowing for orbit of the closed end outer gear about the hollow inner gear, but restricting the orbital and axial motion of the inner gear is also disclosed.
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Darnell Kenneth E.
Ojanen Karla
Vrablik John J.
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