FIELD: power engineering industry. SUBSTANCE: power drive with vane machine is furnished with a gas pressure regulator and slide valve doser. The gas pressure regulator and slide valve doser are installed in succession in the direction of flow in the inlet pipe before the inlet to the guide vanes. The power drive is also furnished with a centrifugal speed governor. The speed governor is mechanically linked with the slide valve doser and with the rotor shaft through a gearing. The shaft uses anti-friction bearings, and the shaft sealing system is a labyrinth sealing with a leak-discharging device. The labyrinth sealing is separated by bores at least into two parts with formation of chambers in the casing. The last chamber in the direction of flow accommodates a gearing. The leak-discharging device consists of two ejectors and a pressure regulator with a pulse tube. The main inlets of the ejectors are connected to the inlet pipe before the gas pressure regulator. Additional inlets of the ejectors are connected to the chambers. The inlet of the ejector connected to the first chamber in the direction of flow communicates with the discharge pipe. The outlet of the ejector connected to the second chamber communicates with the additional inlet of the first ejector. The inlet of the pressure regulator is connected to the discharge pipe, and its outlet - to the second chamber. The pulse tube is also connected to the second chamber. EFFECT: improved design.
