MULTI-STEP ELECTRIC PUMPING UNIT Russian patent published in 1995 - IPC

FIELD: aviation and rocket engineering. SUBSTANCE: electric motor is mounted inside the housing. Working wheels mounted on the shaft of the electric motor, bushings with recesses for receiving the working wheels, and diaphragms interposed between the bushings are arranged inside the housing of the pump. The outlet of each previous step is coupled with subsequent one through a passageway. The rim with the flange is interposed between the housing and bushings of the wheels. The passages are made up as grooves made in the outer side of the rim. Through openings are made at the ends of the grooves. The flange of the rim is connected to the housing of the electric motor and pump by way of detachable joints. EFFECT: improved design. 3 dwg