Marine steam turbine rotor field dynamic balance structure

Abstract

The invention aims at providing a marine steam turbine rotor field dynamic balance structure. The structure comprises a rotor, the rotor is a high-power marine steam turbine flexible rotor, and the rotor is provided with field dynamic balance structures at a first-stage wheel disc, a last-stage wheel disc, a thrust disc and a coupler side flange. According to the structure, multi-plane combined adjustment can be carried out on a plurality of positions of the outer sides of the first-stage wheel disc and the last-stage wheel disc of the rotor, the rotor thrust disc and the coupler output flange. The rotor dynamic balance precision can be improved by adjusting the quality of a dynamic balance block and a screw, and the operability is very high. The dynamic balance precision of the marine steam turbine rotor can be guaranteed for a long time, the safe and stable operation requirements are met, and high expenditure and long-period maintenance for opening a cylinder in a ship cabin and returning the cylinder to a factory for high-speed dynamic balance are saved.

Description

technical field [0001] The invention relates to a marine steam turbine, in particular to a marine steam turbine rotor. Background technique [0002] When designing the rotor of a steam turbine, it is necessary to maintain symmetry with respect to the axis of rotation as much as possible. In fact, the rotor body is basically processed by circular turning, which can maintain the axial symmetry well except for the slight unevenness of the forging material; It will make the rotor center inertial axis deviate from its circumference, resulting in unbalance. This unbalance is the main vibration excitation source of the steam turbine and also the main focus of ship vibration, so the unbalance of the rotor must be eliminated to the greatest extent. [0003] Usually steam turbine rotors are designed with two or more stages of dynamic balance grooves, which are used for high-speed dynamic balancing during rotor manufacturing, reducing the unbalanced quality of assembled rotors, impro...

AI Technical Summary

Problems solved by technology

After the steam turbine has been running for a period of time, due to factors such as assembly clearance changes and blade damage, the unbalanced mass of the rotor increases, resulting in increased vibration of the steam turbine, which may even affect safe operation and even shut down

[0004] Ship steam turbines are generally arranged in the center of the hull. If the steam turbine vibrates violently, it is necessary to destroy the hull deck, open the cylinder of the steam turbine, lift out the rotor, and perform high-speed dynamic balancing again, which consumes a lot of time and money.

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