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Free ring contact type gapless sealing technology

A contact sealing and free technology, applied in the direction of leakage prevention, hydroelectric power generation, engine components, etc., can solve the problems of steam or gas leakage, reduce turbine efficiency, etc., and achieve the effect of reducing processing accuracy requirements, easy processing, and strong sealing

Active Publication Date: 2008-12-24
齐传正
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Free ring contact type gapless sealing technology
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Examples

Experimental program
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Embodiment 1

[0034] As shown in Figures 1 and 2, a free ring contact sealing technology of the present invention includes a sealing member 5 and a leaf spring 10 fixed on a turbine cylinder block or a diaphragm 11, and the axial section of the sealing member 5 is I-shaped. , a leaf spring 10 is installed on its outer circular surface, and is embedded in the T-shaped groove that has been opened in the turbine cylinder block or the partition plate 11. Two sets of wear-resistant seals 1 and 6 are fixed on the rotor, and the wear-resistant seal There is a gap between the outer circular surfaces of the bodies 1 and 6 and the inner circular surface of the seal 5 to prevent the wear caused by the radial vibration of the rotor. There is also a thin steel plate spring 4 between the sealing ring near the wear-resistant sealing body 1 and the wear-resistant sealing body 6, and a thin steel plate spring plate 9 is provided on the side of the sealing ring near the wear-resistant sealing body 6 , thus f...

Embodiment 2

[0037] As shown in Figures 1 and 3, a free ring contact sealing technology of the present invention includes a sealing member 5 and a leaf spring 10 in a split structure fixed on a turbine cylinder or a diaphragm 11. The cross-section of the shaft is I-shaped, and a plate spring 10 is installed on the outer surface of the shaft, which is embedded in the T-shaped groove that has been opened in the turbine cylinder block or the partition plate 11. Two sets of wear-resistant seals 1 and 1 are fixed on the rotor. 6. There is a gap between the outer circular surfaces of the wear-resistant seals 1 and 6 and the inner circular surface of the seal 5 to prevent the radial vibration of the rotor from causing wear. The rotor is also provided with wear-resistant sealing bodies 1, 6 and seals The sealing rings that are in contact with the parts 5 respectively, a thin steel plate spring sheet 4 is also arranged between the sealing ring near the wear-resistant sealing body 1 and the wear-resi...

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Abstract

The invention provides a contact-type seamless sealing technique 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 technique 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 for 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 high, medium and low pressure cylinders of a steam turbine, a water turbine or a turbo compressor. The free ring contact type gapless sealing technology is suitable for all kinds of water seals. (2) Technical background [0002] It is known that the high-temperature and high-pressure gas used for work inside the steam turbine is sealed by the steam sealing ring. In this steam sealing method, a gap of 0.3 mm to 1.0 mm is reserved between the steam sealing ring and the rotating shaft, so the sealing effect is Poor, which directly affects the working efficiency of the steam turbine. In addition, the rotor, steam seal and cylinder of the steam turbine must achieve high machining accuracy because of their sealing, and the installation accuracy is required. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D11/12F03B11/00
CPCY02E10/20
Inventor 齐传正
Owner 齐传正