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. Pumping unit has yoke positioned in body provided with inlet and outlet pipe connections. Electric motor with n[n = 1,2, etc.] working impellers is installed in recess of yoke. Diffuser in the form of groove made on external surface of yoke is arranged between the last impeller outlet and hole of outlet pipe connection. Yoke is provided with through hole, coupling the last impeller outlet with diffuser groove origin. Cross-sectional area of groove is monotonously increased from through hole section to section of hole of outlet pipe connection. Recess is made eccentric to external cylindrical surface of yoke. Starting section of diffuser groove is provided at place of yoke minimum thickness. Hole of outlet pipe connection comes out onto external surface of yoke at place of maximum thickness of yoke. Groove is made equidistant with respect to surface of recess. EFFECT: reduced axial overall dimensions and mass of unit. 2 cl