MULTI-STAGE ELECTRIC PUMPING UNIT Russian patent published in 2009 - IPC F04D1/06 F04D13/06 F04D29/62 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to mechanical engineering hydraulics and may be used as a part of heat control systems in aviation and rocket engineering items. Multi-stage electric pumping unit contains housing 1 and mounted frame 3. In the frame 3 bore 5, there is an electric motor 6 and n [n=2, 3 etc.] of impellers 7, 8, and bushings 10, 11 contacting with internal cylindrical surface 9 of bore. Bushings are provided with hollows 12, 13 to locate impellers 7, 8 and aperture 14 between bushings 10, 11. Aperture are installed in frame of n-1 transition channels 15 connecting outlet 16 of each previous impeller 7 with inlet 17 of each next impeller 8. The pumping unit includes also fixing elements 19, 20 to hold bushings 10, 11 and aperture 14 in corner position with regard the frame 3. Transition channels 15 are implemented as open-end grooves between internal and external cylindrical surfaces 9, 4 of frame 3. There is a stop 18 made inside bore 5 for an utmost bushing 11. Fixing elements 19, 20 are made as dowels 21, 22 located inside bushings 10, 11, apertures 14 and stop 18 of frame 3 bore 5. Dowels 21, 22 are inside internal cylindrical surface 9 of frame 3.

EFFECT: invention is aimed to reduction of radial dimensions and weight and to simplification of structure.

4 dwg