Three-point centring adjustment device for low-pressure shaft end steam seal of steam turbine

Abstract

The invention discloses a three-point centring adjustment device for a low-pressure shaft end steam seal of a steam turbine. Three adjusting bolts and three adjusting nuts correspondingly screwed on the adjusting bolts are respectively arranged on left and right sides of a flange, close to a horizontal split, of a lower half perpendicular surface of a low-pressure shaft end steam seal body and the bottom of the lower-pressure shaft end steam seal body, and the three bolts and the corresponding three nuts jointly form a three-point centring structure. By the aid of analysis to actual adjustment assembly, operation conditions and the like, the three-point centring adjustment device can meet requirements on operation and service of the steam turbine, has enough adjustment precision, is simple in structure and convenient in operations including processing, installation, repair and the like, and has good economical efficiency and stability. In addition, the device is simple in structure and high in generality, adjustment precision is higher by the aid of the low-pressure shaft end steam seal of the device, adjustment centring is more accurate by the aid of a rotor and a main shaft, and a sealing effect of the shaft end steam seal is better.

Description

technical field [0001] The invention relates to a three-point centering adjustment device for a low-pressure shaft end seal of a steam turbine, which is particularly suitable for adjusting the gap of the low-pressure shaft end seal of a large condensing steam turbine. Background technique [0002] The steam turbine is composed of a stator and a rotor, and is a high-speed rotating power equipment that converts the thermal energy of the working medium steam into mechanical energy. The low-pressure part of a large condensing steam turbine works in a negative pressure state below atmospheric pressure. The steam turbine is equipped with a shaft-end seal structure to prevent steam / air leakage in the gap between the dynamic and static parts, which affects the quality of the working medium. [0003] The low-pressure shaft end seal of condensing steam turbine generally has an integral casting and assembled seal ring structure, which is connected to the low-pressure cylinder by flange...

AI Technical Summary

Problems solved by technology

[0003] The low-pressure shaft end seal of condensing steam turbine generally has an integral casting and assembled seal ring structure, which is connected to the low-pressure cylinder by flanges. This structure is prone to eccentricity in the installation of the low-pressure shaft end seal due to bolt positioning deviation. Therefore, during the operation of the steam turbine, the low-pressure shaft-end steam seal and the rotor shaft will contact and rub along the circumferential direction, thereby increasing the dynamic and static clearance of the shaft end, which is not conducive to the sealing of the low-pressure shaft-end steam / air, resulting in air leakage , reduce the operating efficiency of the steam turbine, and at the same time affect the quality of the working fluid

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