Multi-cavity independent air bag flexible supporting hole type damping seal

Abstract

A multi-cavity independent air bag flexible supporting hole type damping seal comprises a sealing lining, a flexible air bag and a sealing shell sequentially from inside to outside in a sleeved mode,wherein the sealing lining, and the flexible air bag and the sealing shell are all cylindrical barrels sharing the same axis line; damping holes are evenly distributed in the inner wall of the sealinglining, and the outer wall of the sealing lining is a smooth face and is tightly attached to the flexible air bag; the flexible air bag comprises a plurality of metal film air bag units which are evenly distributed in the axial direction and the circumferential direction and connected with one another into a whole through connecting parts; an independently controlled air valve is arranged on theouter surface of each film air bag unit; and through holes in one-to-one correspondence with the air valves are formed in the sealing shell, and the air valves penetrate through the through holes to be connected with an external air pipeline. The rigidity and damping of the sealing structure of each part can be adaptively regulated and controlled according to the change of working conditions, andthe problem that sealing teeth are abraded by a rotor under extreme working conditions in the unit operation process, and consequently a steam seal gap is enlarged is effectively solved.

Description

technical field [0001] The invention relates to a rotary turbomechanical seal technology, in particular to a multi-chamber independent airbag flexible support hole type damping seal. Background technique [0002] At present, with my country's increasing requirements for energy utilization efficiency, turbomachinery such as steam turbines and gas turbines is developing towards high efficiency, stability, and high power, and the hazards of fluid excitation in traditional seal gaps are becoming increasingly prominent. It has become one of the key technologies in the development of modern turbomachinery to reduce the leakage of the sealing gap, suppress the fluid excitation in the sealing gap, and ensure the stability of the unit operation. Analyzing the cause of the fluid excitation force shows that when the rotor is running with an uneven circumferential gap with the seal cavity, an uneven pressure distribution will be formed around the rotor, and the resultant force of the di...

AI Technical Summary

Problems solved by technology

However, ordinary flexible seals are limited in use because they cannot be used under high temperature conditions.

In short, none of the existing rigid seals and flexible seals can meet our requirements for seals with low leakage, excellent dynamic characteristics and strong self-adaptation

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