Sealing structure for high-pressure main throttle valve of steam turbine

The utility model discloses a steam turbine high-pressure main throttle valve sealing structure which comprises a driving shell, a valve shell, a driving mechanism, a rotating shaft, a rocker arm, a valve cover, an adjusting ring and a spherical sealing ring. One end of the rotating shaft is located in the driving shell, the rotating shaft is provided with a shaft shoulder part on the outer side of the communicating hole, an annular groove is formed in the inner wall of the communicating hole, the adjusting ring is located in the annular groove, and the adjusting ring is in threaded connection with the annular groove; the spherical sealing ring is connected between the adjusting ring and the shaft shoulder part in an abutting mode. According to the technical scheme, the problem that steam leaks after an existing steam turbine main throttle valve is used for a long time is solved. 本实用新型公开了一种汽轮机高压主汽门密封结构，包括驱动壳体、阀门壳体、驱动机构、转轴、摇臂、阀盖、调节环和球面密封环，所述驱动壳体与所述阀门壳体连接，所述驱动壳体设置有供所述转轴穿过的连通孔，所述转轴的一端位于所述驱动壳体中，所述转轴在所述连通孔的外侧设置有轴肩