Diaphragm pump

Details Diaphragm pump Diaphragm pump

1983-01-21

1985-03-26

Smith, Leonard E.

Pumps

Motor driven

Electric or magnetic motor

417572, F04B 908, F04B 4306

Patent

active

045070628

ABSTRACT:
A diaphragm pump, particularly for conveying flammable media, has a housing whose interior is divided into a pumping chamber and a second chamber by a deformable diaphragm having a marginal portion which is clamped between two sections of the pump head and being deformable by a cupped member which is biased in one direction by a coil spring and is movable in the other direction by a plunger receiving motion from a motor and being in mere abutment with the bottom wall of the cupped member. The housing defines a first set of gaps which connect the second chamber with the atmosphere and a second set of gaps which connect the atmosphere with the pumping chamber. The dimensions and shapes of the gaps are such that they do not permit the propagation of ignition from the respective chamber to the atmosphere.

REFERENCES:
patent: 2975599 (1961-03-01), Bennett
patent: 3072462 (1963-01-01), Anderson
patent: 3288071 (1966-11-01), Anderson
British Standards Institution, "Electrical Apparatus for Potentially Explosive Atmospheres," 1977.

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