VACUUM PUMP Russian patent published in 1997 - IPC

FIELD: vacuum engineering. SUBSTANCE: vacuum pump has stator, rotor, expansion chamber, and inlet and outlet branch pipes. The axis of rotation of the rotor is coincident with the geometric axis of its cylindric surface. The stator and rotor form several chambers for expansion each of which is overlapped with a blade set in guides rigidly connected with the rotor. The rotor has axial chambers separated by guide blades and connected with the expansion chamber through inlet valve made up as a door. The outlet branch pipe for the first stage of the pump is the inlet branch pipe for the second stage which in turn is the inlet branch pipe for the third stage. EFFECT: enhanced efficiency. 5 cl, 4 dwg