Pumps – Motor driven – Fluid motor
Patent
1982-07-23
1984-06-05
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
417478, F04B 4310
Patent
active
044525729
ABSTRACT:
Dry vacuum diaphragm pump, for pumping between an inlet port (2) and an exhaust port (3), and comprising a tubular diaphragm (12) retained by its resilience on a central body (11) in the biconical interior volume of a body (1), in such manner as to form a pumping chamber (15) into which debouch inlet and exhaust ports, and a control chamber (16).
Port (3) communicates through a valve (7) with a capacity (9) maintained under partial vacuum by an auxiliary vacuum pump (23).
The distribution mechanism (20, 21, 27) places the chamber (16) in communication alternatively with atmosphere and with the intake of the auxiliary pump (23).
REFERENCES:
patent: 2970546 (1961-02-01), White
patent: 3824792 (1974-07-01), Grabb et al.
patent: 4212589 (1980-07-01), Bosio
patent: 4269906 (1981-05-01), Schmechtig
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