Tandem type dry gas sealing device for industrial steam turbine

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of mechanical seals, in particular to a serial dry gas seal device for industrial steam turbines. Background technique [0002] The steam turbine is one of the main equipment of the steam power plant, and it is a rotary power machine that converts the energy of steam into mechanical work. The working principle of the steam turbine is that steam with a certain pressure and temperature enters the steam turbine, expands rapidly in the nozzle to obtain a high flow velocity, and then the high-speed flowing steam impels the turbine rotor blades to rotate and do work, thereby obtaining mechanical energy. A steam turbine is mainly composed of a rotating part, a fixed part and a control part. [0003] Industrial steam turbines are driven by steam, and are mainly used in chemical, petroleum, mining, metallurgy, papermaking, textile, sugar and other industrial enterprises. Industrial steam turbines drive various type...

AI Technical Summary

Problems solved by technology

The leakage of steam will cause energy loss. In addition, the leaked steam needs to be cooled by cooling water, and the amount of cooling water is also very large.

According to statistics, for a medium-sized steam turbine unit, the annual steam leakage, cooling water consumption, and subsequent operation and maintenance costs are equivalent to an operating cost of more than one million yuan

[0005] Different from the dynamic and static seals of general machinery, there are many factors affecting the shaft end seal of industrial steam turbines, and the situation is complicated

Images