Telescopic brush type gland ring

Abstract

The invention relates to a telescopic brush type gland ring formed by a plurality of gland loops through head-to-tail connection. Each gland loop comprises a loop body, a high tooth sealing strip, a low tooth sealing strip and a telescopic sealing brush, wherein the sealing brush comprises a brush head and a T-shaped brush body; the brush head is formed by tightly arranged metal wire layers of which the outer ends are welded between two clamp plates; the brush head is fixedly arranged in a brush slot of the brush body; and the bottom of the brush body is arranged in a T-shaped slot of the loopbody by a sheet spring. The sealing brush mainly consists of tightly arranged fine alloy wires with good flexibility and high-temperature resistance, has good elasticity, and is matched with the sheet spring at the bottom of the brush body. When the sealing brush contacts and abrades with a rotor, the sealing brush can elastically retract. Due to the function of brush wire clearance, the uniformincoming flow changes the motion direction after entering the brush wire bundle, and is changed into transversal flow perpendicular to the main flowing direction, therefore generating self-sealing effect, and further reducing leakage. The invention has the advantages of good sealing performance, simple and reasonable structure and the like, and is especially suitable for replacement and update ofmovable seals of prior steam turbines.

Description

technical field [0001] The invention relates to a steam seal device, in particular to a telescopic brush-type steam seal ring suitable for dynamic sealing of large-scale rotor mechanical equipment such as a steam turbine of a steam turbine generator set, belonging to the seal device of a steam turbine. Background technique [0002] By the end of 2007, 506 steam turbine generator sets with a capacity of 300MW designed and manufactured by the three domestic steam turbine factories had been put into production, with an installed capacity of 157,518MW, accounting for 32.5% of the total installed capacity of thermal power in the country. From the design economic performance analysis, there is a big gap between these subcritical units and the 600MW and above supercritical or ultra supercritical units that have been put into production in recent years. How to transform and improve the economic performance is a realistic problem before the decision makers of enterprises. [0003] T...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned existing steam seal rings, and design a simple and reasonable structure, good sealing performance, which can adapt to the instantaneous radial deformation or eccentric movement of the rotor, and minimize the pressure on the premise of ensuring safety. The sealing gap can appropriately increase the vibration resistance of the rotor in the case of contact sealing, which is conducive to improving the stability of the rotor. It is suitable for large-scale rotor mechanical equipment, especially the telescopic brush-type steam seal ring used in the dynamic seal of steam turbines.

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