LPRE PUMP UNIT Russian patent published in 2010 - IPC F02K9/46 F04D13/04 

FIELD: engines and pumps.

SUBSTANCE: gearbox housing 8 incorporates casing 15 to embrace said housing to make peripheral space 16. Gearbox housing 8 has holes 17 to release cooling fluid from inner space of reduction gearbox 9 into peripheral space 16. Drain pipeline 12 serves to remove cooling fluid from reduction gearbox space 9 and has its ends connected to reduction gearbox 15 and intake branch pipe 18 of booster pump 1 to communicate reduction gearbox peripheral space 16 with booster pump intake branch pipe space 19. Described cooling circuit allows operating in reduction gearbox conditions, not in gear pump conditions, at minimum heating of pumped fluid.

EFFECT: higher cavitation stability and pump efficiency, simplified design.

3 dwg