TURBOPUMP SET Russian patent published in 2014 - IPC F04D13/04 F04D29/41 

FIELD: engines and pumps.

SUBSTANCE: set comprises two pumps connected by shafts using a splint joint. A turbine wheel is fixed on the first shaft. On the shaft of the second pump there is an unloading piston of an automatic axial force unloading device limited by a radial seal in the peripheral part and having at both sides cavities of high and low pressure. The shaft of one pump with a support end rests against the support end of the second pump shaft. The second pump comprises an auger installed upstream its centrifugal impeller. The high pressure cavity is connected to the outlet of this pump via a pressure controller, comprising a throttle and a control stem contacting with the end of the shaft of this pump. The low pressure cavity is connected to the cavity between the auger and the impeller of this pump.

EFFECT: improved cavitation characteristics of one of pumps.

3 cl, 5 dwg