Free ring contact type gapless sealing technology

Abstract

The invention provides a contact-type seamless sealing structure of a free ring, belonging to the steam turbine steam seal technical field. The structure comprises a sealing member and a board spring fixed on the turbine cylinder or on a clapboard, wherein, the axial cross section of the sealing member is I-shaped, a board spring is arranged on the outside circular surface, and the sealing member and the board springs are embedded in the T-slots of the turbine cylinder or the clapboard; at least one set of wear-resistant seals are fixed on the rotor, wherein, a space is arranged between the outside circular surface of the wear-resistant seals and the inside circular surfaces of the seals; a gasket ring contacting the wear-resistant seals and the seals are arranged on the rotor, wherein, the other free plane of the gasket ring contacts a thin sheet leaf spring arranged on the rotor. The gasket ring comprises at least two seal rings which are capable of moving freely in both the radial and the axial directions. The seamless sealing structure of the invention achieves the purposes of both sealing and free movement, ensures that the rotating shaft causes no damage to the seals no matter in radial vibration or axial float, thus achieving long lasting and durable sealing and long-term guaranteeing of the sealing quality. The invention is applicable to the sealing of the parts between loose axles and static cylinder sleeves of steam turbines, hydraulic turbines and turbines.

Description

(1) Technical field [0001] The invention relates to a steam seal improvement technology of a steam turbine, a water turbine or a turbine, in particular to a shaft seal, a diaphragm seal, a shroud seal and a water turbine for the high, medium and low pressure cylinders of a steam turbine, a turbine or a turbo compressor The free ring contact type gapless sealing structure is suitable for all water seals. (2) Background technology [0002] It is known that the high-temperature and high-pressure gas used to do work inside the steam turbine is sealed by the seal ring. In this seal method, there is a gap of 0.3mm to 1.0mm between the seal ring and the rotating shaft, so the sealing effect Poor, directly affect the working efficiency of the steam turbine. In addition, the rotor, steam seal, and cylinder of the steam turbine must be processed with high precision because they are sealed, and the installation precision is high. [0003] For water turbines, the size of the gap betwe...

AI Technical Summary

Problems solved by technology

[0004] For turbines, the efficiency of the turbine depends at least in part on the radial clearance between the tips of the rotating blades and the surrounding casing, on maintaining a clearance between the rotor and the diaphragm seal. If either clearance is too large, steam or gas The flow may leak through the gap, reducing the efficiency of the turbine

Additionally, if either clearance is too small, the rotor blade tips may undesirably contact the surrounding casing under certain turbine operating conditions

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