Rotary pump

Details Rotary pump Rotary pump

2007-07-03

2007-07-03

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

With mechanical sealing

Axially movable end wall or end wall portion

C418S134000, C418S206100

Reexamination Certificate

active

10054755

ABSTRACT:
A rotary pump has a simple construction by omitting a transmission shaft on the side of a motor and whereby makes a cost of the rotary pump as low as possible, with maintaining feature that assembling and disassembling is facilitated. The rotary pump has a main casing, a casing cover cooperated with the main casing for defining a pumping chamber therebetween, a pair of rotors received within the pumping chamber with mutually meshing pumping segments for synchronous revolution in mutually opposite directions, a space being defined in one portion of the casing cover, a cover piston being disposed within the space for movement back and forth with respect to an end surface of the rotor, and an air cylinder being mounted on the casing cover and having a piston rod, to which the cover piston is connected.

REFERENCES:
patent: 1694805 (1928-12-01), Sumner
patent: 2038090 (1936-04-01), Smith
patent: 2210152 (1940-08-01), Sacha
patent: 2635552 (1953-04-01), Dale et al.
patent: 2909124 (1959-10-01), Maisch
patent: 5120206 (1992-06-01), Greenstreet et al.
patent: 6808374 (2004-10-01), Phallen et al.

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