ELECTRIC PUMPING UNIT Russian patent published in 2003 - IPC

FIELD: rocket and space engineering. SUBSTANCE: invention relates to temperature control systems of rockets and space vehicles. Proposed electric pumping unit contains housing with inlet and outlet unions, cylindrical envelope and end face wall. Housing accommodates electric motor with n (n-1, 2, etc) working wheels and holders with bore. Holder bore accommodated n bushings with bore for working wheels and (n-1) diaphragms between bushings. Diffuser is made in holder between outlet hole of bushing of last stage onto inner surface of holder and hole of outlet union on inner surface of housing with cross section of diffuser space monotonically increasing from section of outlet hole to section of hole of outlet union. Inlet union is located on end face wall coaxially with motor. Cylindrical envelope and end wall are interconnected through flanges, outlet union being arranged on end face wall parallel to inlet union. Holder is made split along plane passing through axis of outlet union and axis of outlet hole. Axis of diffuser lies within said plane and having the from of smooth curve whose one end is coaxial with outlet hole and the other, with outlet union. Centers of curvature of all points of said curve lie from side of inlet union relative to curve. EFFECT: improved convenience of mounting reduced hydraulic resistance of unit. 5 dwg