PUMPING SET Russian patent published in 1994 - IPC

FIELD: medicine. SUBSTANCE: electric motor and pumping unit connected with it are arranged in hermetic casing which has end walls and inlet and outlet branch pipes. Pumping unit has stator ring with end plates and working medium supply and discharge passages. Rotor is mounted in ring on the shaft forming working chambers. Circular silencer is located on end plate forming closed chamber. Made in stator ring opposite inlet branch pipe is L-shaped passage coming respectively to cylindrical and end surfaces of the ring; through hole in end plate is brought in communication with L-shaped passage. Silencer is located between end plate and end wall of casing for communication with inlet branch pipe via through hole and L-shaped passage and with working chambers via supply passages made in form of axial bores located in end plate. EFFECT: enhanced reliability. 2 cl, 4 dwg