| 摘要 |
FIELD: pump engineering. SUBSTANCE: device has multi- stage pump, turbine, rotor, unloading space of the impeller with a control member, axial space in the control member, drain space downstream of the unloading space, and rotor seal that separates the spaces of the turbine and pump. The drain space is connected with the inlet of the impeller of the second stage through openings provided in the impellers and ring passageway defined by the shaft and hubs of the impellers. There is a ring projection on the housing from the side of the turbine disk at its periphery. The projection and the end face of the turbine form an axial space. The projection and the separating seal of the rotor form the unloading space. The value of the axial space, when the rotor is shifted in the direction to the turbine, is equal to the axial stroke of the rotor. EFFECT: enhanced efficiency. 2 dwg |
