ELECTRIC PUMP UNIT Russian patent published in 2015 - IPC F04D13/06 F04D29/02 F04D1/04 

FIELD: electricity.

SUBSTANCE: motor and pump housings in electric pump unit (EPU) are made of aluminium alloy, connected tightly and separated by cylindrical non-magnetic shielding shell out of titanium alloy. Motor housing is connected to shell end perimeter by a flange at rotor wheel side by a main bimetal bushing out of aluminium and titanium alloys. The other shell end perimeter is welded at outer and inner side to the motor housing bottom by first and second additional laminated bimetal bushings. Weld joints are made similar to connection by the main laminated bimetal bushing, with titanium and aluminium alloys welded to titanium and aluminium EPU parts respectively. Central part of pump housing bottom features an inlet pipe piece coaxial to the shaft and installed with a gap between its inner end surface and shaft end surface. The rotor is made in the form of a pipe with an auger attached to its internal surface. The other shaft end surface along the pipe perimeter is welded to central inlet perimeter in the EPU rotor wheel with a side outlet.

EFFECT: enhanced performance, reliability, reduced weight.

3 cl, 1 dwg