Adjustable thrust balance structure of gear box type steam turbine

The invention relates to the technical field of gear box type steam turbines or gear box integrated compressor units, in particular to an adjustable thrust balance structure of a gear box type steam turbine, which comprises a thrust balance structure, an axial flow steam turbine impeller, a gear box, a high-pressure steam inlet pipe and a pneumatic control valve, the axial flow turbine impeller is arranged at the other end of the gear box, the two ends of the high-pressure steam inlet pipe communicate with the thrust balance structure and the axial flow turbine impeller correspondingly, the pneumatic control valve is arranged on the high-pressure steam inlet pipe, and high-pressure steam is branched through a turbine inlet pipeline, enters the thrust balance structure from the high-pressure steam inlet pipe and the pneumatic control valve and then enters the thrust balance structure. Therefore, the thrust balance structure generates differential pressure balance thrust, and the pneumatic control valve can be