| 摘要 |
The invention relates to a pump turbine system comprising a turbine with a turbine impeller as well as a turbine spiral housing; and a pump with a pump impeller as well as a pump spiral housing; an electrical machine which is in drive communication with the shaft or can be brought into such communication; a hydraulic short circuit can be produced between turbine and pump. The invention is characterized by the following features: the turbine has a higher rated power than the pump; a labyrinth seal is formed from the impeller and the housing of each of the hydraulic machines through which a leakage flow flows during operation for cooling and/or lubricating the labyrinth seal; the labyrinth seal comprises a plurality of annular chambers as well as annular gap-shaped channels connecting these in a conducting manner; impeller and housing of the relevant hydraulic machine are mounted displaceably relative to one another between an operating position and a non-operating position in the direction of a leakage flow. |
