Multi-stage reciprocating vacuum pump and method of...

Details Multi-stage reciprocating vacuum pump and method of... Multi-stage reciprocating vacuum pump and method of...

2007-06-05

2007-06-05

Stashick, Anthony D. (Department: 3746)

Pumps

Successive stages

With interstage intake or additional inlet to latter stage

C417S062000, C417S251000, C417S254000, C417S255000, C417S440000

Reexamination Certificate

active

10690112

ABSTRACT:
A multi-stage reciprocating vacuum pump includes first (2) and second (4) pump chambers located in the pump housing (1) and in which respective pistons (6, 8) reciprocate, first and second conduits (14, 20) for communicating, respectively outlet and suction (15, 16) sides of the first pump chamber (2) with the suction side (17) of the second pump chamber (4), and shut-off elements (18, 21; 25) associated with the first and second conduits (14, 20) for selectively communicating the first and second conduits (14, 20) with the suction side (17) of the second pump chamber (4); and the method of operating the pump includes manipulating the shut-off elements so that the first and second conduits (14, 20) are selectively connected to the suction side (17) of the second pump chamber (4).

REFERENCES:
patent: 2246932 (1941-06-01), Collins
patent: 4043704 (1977-08-01), Zimmern
patent: 4111609 (1978-09-01), Braun
patent: 0202190 (2002-08-01), None
patent: 0715077 (1996-05-01), None
patent: 0863313 (1998-09-01), None
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