Test device for simulating and testing turbine generator set shaft system torsional vibration and strength

Abstract

The invention discloses a test device for simulating and testing turbine generator set shaft system torsional vibration and strength, which comprises a main body assembly, a measurement assembly and a lubricating oil assembly, wherein the main body assembly comprises a rotation shaft, a motor, a cylinder, a generator, a power grid simulator and a power harmonic generator; two ends of the rotation shaft are respectively connected with the motor and the generator; the cylinder is arranged on the rotation shaft and quality disc groups are arranged between the cylinder and the motor and between the cylinder and the generator; the power grid simulator is connected with the generator, and the power harmonic generator provides power for the motor; the measurement assembly comprises torsional vibration measurement parts and a bending vibration measurement part; each torsional vibration measurement part comprises a gear, a magnetic base and a magnetoresistive rotation speed sensor; the gear is arranged at the shaft end position of the rotation shaft; the magnetic base is absorbed on the surface of a base; the bending vibration measurement part is an electric turbine displacement sensor arranged inside the cylinder; and the lubricating oil assembly comprises an oil box and a gear pump. The device of the invention has the advantages of controllable test conditions, low test cost and reproducible test results.

Description

technical field [0001] The invention belongs to the field of industrial steam turbine torsional vibration test devices, and more specifically relates to a test device for simulating and testing the torsional vibration and strength of a shaft system of a steam turbine generator set. Background technique [0002] With the development of the electric power industry, the single unit capacity and power density of steam turbines are constantly increasing, as well as the large-capacity, long-distance and diversification of power loads in the transmission network, resulting in torsional vibration of the shaft system, causing fatigue damage or even damage to the steam turbine unit, Therefore, serious economic losses are caused. The torsional vibration of the rotor shafting of a large unit directly leads to excessive fatigue damage of the torsional vibration of its dangerous parts, which has a serious impact on the safety of the shafting generator set. [0003] At present, there are ...

AI Technical Summary

Problems solved by technology

[0002] With the development of the electric power industry, the single unit capacity and power density of steam turbines are constantly increasing, as well as the large-capacity, long-distance and diversification of power loads in the transmission network, resulting in torsional vibration of the shaft system, causing fatigue damage or even damage to the steam turbine unit, resulting in serious economic losses

The torsional vibration of the rotor shafting of a large unit directly leads to excessive fatigue damage of the torsional vibration of its dangerous parts, which has a serious impact on the safety of the shafting generator set

[0003] At present, there are more and more studies on the mechanism of torsional vibration and torsional vibration fatigue damage, but there are few experimental studies on the fatigue damage of shafting components under torsional vibration, especially the impact of small-amplitude long-term shafting torsional vibration on weak parts of shafting torsional vibration. There are no standards or norms to evaluate the safety impact of

In recent years, in a large energy base in northern my country, the shafting of the unit shaft system was damaged and scrapped after a small torsional vibration for a long time, resulting in huge economic losses and negative social consequences.

The results of theoretical and numerical simulation analysis show that the concentrated stress formed in the small-amplitude torsional vibration phenomenon is relatively close to the fatigue limit of the material, which brings difficulties in setting the value of the torsional vibration operation monitoring of the unit, so it is urgent to develop in this respect Experimental Research

Images