RESERVED ELECTRIC PUMP UNIT Russian patent published in 2000 - IPC

FIELD: hydraulic machine engineering, possibly heat control systems in aircraft and missile equipment and in other industry branches. SUBSTANCE: reserved electric pump unit includes housing with inlet and outlet unions, n number of centrifugal electric pumps mounted in housing. Each electric pump is in the form of cylindrical casing embedding pump unit and electric motor. Diffuser of pump unit is in the form of variable cross section groove on outer surface of casing. In housing there are n number of turnings for placing casings and n ducts for joining opening of outlet union with diffusers of electric pumps. On outer surface of each casing there is additional helical groove whose one end is dead and other end is joined with groove of diffuser. Plunger with cross section equal to that of groove is placed in helical groove with possibility of motion along groove. In casing at side of groove there is stopper for limiting motion of plunger. Return type compression spring is placed in cavity between plunger and dead end of helical groove. Cavity between plunger and dead end of helical groove is joined with inlet cavity. Outer cylindrical surface of plunger embraces duct in zone where said duct opens to cylindrical surface of turning. EFFECT: reduced mass and size of pump unit. 3 cl, 6 dwg