BELLOWS-PISTON PUMP Russian patent published in 2005 - IPC

FIELD: pump building.

SUBSTANCE: bellows-piston pump can be used in systems where pumps work with variable output pressure for producing vacuum and at other objects. Pump has hollow piston made for longitudinal movement, and bellows member which has one end fastened tightly at piston and the other one - at base of admission valve. Hollow rod is disposed inside piston which rod has at least one hole and exhaust valve that can move longitudinal along piston and to overlap admission valve at one of its end positions. Piston is provided with lock, which interacts with rest made on rod. The lock fixes the rod relatively piston at end low position of piston provided with rod. It releases the rod relatively case at end top position of piston provided with rod.

EFFECT: simplified design; high reliability; improved output.

3 cl, 4 dwg