PNEUMATICALLY-OPERATED DOUBLE-ACTING DIAPHRAGM PUMP Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: double-acting diaphragm pump has housing with passages, inlet and outlet holes, two diaphragms connected by means of rod which divide diaphragm chambers into drive and pressure supply chambers and cylindrical bush with holes. Spool valve gear is made in form of guide axle with circular bores and longitudinal passages; mounted on side of end surfaces of cylindrical bush where circular bores are formed are circular bushes which have chambers and holes; circular bushes form locking chambers together with end surfaces of circular bores of the guide axle. With the guide axle in the extreme positions, pressure supply chambers are brought in communication in turn through circular bores and holes in cylindrical bush and circular bores in guide axle with inlet and outlet holes of housing and locking chambers are brought in communication with outlet holes of housing through holes in cylindrical bush. EFFECT: enhanced reliability. 2 dwg