Non-contact type steam turbine steam seal structure

A non-contact type steam turbine steam seal structure is used to improve the sealing performance. The non-contact type steam turbine steam seal structure adopts the technical scheme that the structure consists of a steam seal body and steam seal gears, wherein the steam seal body is in a ring shape, the steam seal gears are distributed on the inner ring surface of the steam seal body, the gear direction of the steam seal gears after improvement is in a spiral form, and the included angle beta between the spiral direction thereof and the axial direction of the gas seal body is 60 to 75 degrees. When the steam turbine works, a steam turbine shaft can drive surrounding steam to rotate in rotation, the steam can generate axial flowing force in the spiral steam seal gears, thereby preventing gas from leaking into the steam turbine or outside the steam turbine through a shaft seal, thereby generating resistance to prevent the steam from leaking from the steam turbine (or to prevent air from leaking in), and achieving the effect of preventing or reducing steam leakage of the steam turbine, and improving the steam turbine efficiency. Compared with common non-contact type comb tooth type labyrinth gland packing, the non-contact type steam turbine steam seal structure has better sealing performance based on the function principles.