The invention discloses a tandem type
dry gas sealing device for an industrial
steam turbine. The device comprises two groups of rotary sealing components and two groups of static sealing component arranged in tandem. Each group of the rotary sealing component comprises a movable ring and a movable ring base. Each group of the static sealing component comprises a seal
cartridge fixed in the shell,and further comprises a static ring and a corrugated
pipe coaxially arranged with a shaft sleeve. Under the action of own elastic force, an inner side end face of the corrugated
pipe relies on an external side end face of the static ring, thus, a contact seal structure is formed. The static ring is arranged between the corrugated
pipe and the movable ring, and is in floating connection with the seal
cartridge through a stop pin. When the movable ring rotates with a
steam turbine shaft, the external side end face of the movable ring and the inner side end face of the static ring form a non-contact gas film
lubrication state. Since the movable ring and the static ring have self-adjusting capability, stable gas film
lubrication non-contact seal is formed between the movable ring and the static ring, thus,
high pressure steam is sealed in the
steam turbine, zero-leakage seal for the steam in the steam
turbine is realized, and
energy conversion efficiency of the steam
turbine is improved greatly.