| 摘要 |
The invention relates to a pump-turbine system, comprising - a turbine with a turbine rotor and a spiral turbine housing; - a pump with a pump rotor and a spiral pump housing; - an electric machine which is drive-connected to the shaft or can be brought into a connection of this type; - a hydraulic short-circuit can be produced between the turbine and the pump. The invention is characterized by the following features: - the turbine has a higher nominal rating than the pump; - in each case one labyrinth seal is formed from the rotor and the housing of each of the hydraulic machines, through which labyrinth seal a leakage flow for cooling and/or lubricating the labyrinth seal flows during operation; - the labyrinth seal comprises a plurality of annular chambers and ducts in the shape of annular gaps which connect said annular chambers to one another in a conducting manner; - the rotor and housing of the relevant hydraulic machine are mounted such that they can be displaced relative to one another between an operating position and a non-operating position in the direction of a leakage flow. |
