ELECTRIC PUMPING UNIT Russian patent published in 2001 - IPC

FIELD: machine-building hydraulics. SUBSTANCE: electric pumping unit may be used as a part of temperature-control systems of aviation and rocket engineering articles. Pump body accommodates yoke contacting it along tapered surface. Electric motor with n(n=1,2, etc.) working impellers is arranged in yoke recess. The yoke is provided with through hole coupling the last impeller output with origin of diffuser made as a groove on external surface of the yoke. End of diffuser groove is coupled to hole of outlet pipe connection. Cross-sectional area of the groove is monotonously increasing from through hole section to section of hole of outlet pipe connection. Width of diffuser groove in end section is equal to diameter of hole of outlet pipe connection. Middle line of the groove is monotonously moving away along cone axis from initial section to the end one. Base of groove is made equidistant relative to cone axis, its width is constant along entire length of the groove. Lateral sides of groove section are made in the form of curves, symmetrical with respect to middle line of groove moving away monotonously from middle line of groove starting from its base. EFFECT: enhanced technological effectiveness of diffuser manufacture. 2 cl, 5 dwg