GAS-TURBINE PLANT DELIVERING WORKING MIXTURE TO CONSUMER FOR USE IN CHEMICAL PROCESS AFTER WHICH WORKING MIXTURE IS RETURNED INTO PLANT GAS TURBINE Russian patent published in 1998 - IPC

FIELD: chemical industry. SUBSTANCE: plant has compressor and turbine whose settings are separated by diaphragm, labyrinth-and- screw sealing arrangements installed at compressor suction side and at turbine discharge side and provided with opposite direction screw channels. Screw channels of labyrinth-and-screw sealing arrangements are made on surfaces of rings installed with radial clearance and secured in housing of compressor on shaft and in housing of turbine at side of discharge. Both sealing arrangements are of active type. Number of thread teeth on shaft in compressor housing is 15-60 and in turbine housing -30-80. Angle of helix for threads of all rings is 55-75 degrees, height of teeth is 3-16 mm, thread pitch is 10-26 mm. Tooth taper angle is 18-35 degrees. Width of upper flat of tooth does not exceed 3 mm. Radial clearance is 0.4-1.2 mm. Sealing arrangements can be made with trapezoidal multistart thread. Width of rings is within 40 and 200 mm, depending on diameter of shaft. EFFECT: reduced leakage of working gas at exhaust and suction of oil vapors into engine. 3 cl, 4 dwg