Shaft vibration amplitude detecting system for steam turbine

Abstract

The invention discloses a shaft vibration amplitude detecting system for a steam turbine. The system comprises a shaft and a main body. The main body is provided with a detecting clamp slot, a detecting mechanism, a vertical paper tape cavity, a rubber roller, a speed regulating motor, a contact switch, a paper tape, a tape reel and a lateral tape cavity. The detecting clamp slot is fixedly formedin the center of the bottom of the main body and is used for placing a to-be-detected shaft. The main body is arranged at the top of the detecting clamp slot and the detecting mechanism is arranged at one side; the detecting mechanism is used for detecting the vibration of the shaft. Therefore, when the steam turbine is stopped, the main body can be clamped above the shaft to realize detection ofthe vibration of the shaft, so that the continuity of the operation of power plant equipment is ensured. Besides, with the mode of scribing a line on the paper tape, the amplitude and frequency of vibration of the shaft can be obtained visually; and maintenance alarming can be carried out when the shaft vibration is serious.

Description

technical field [0001] The invention relates to the technical field of steam turbines, in particular to a system for detecting the vibration amplitude of a steam turbine shaft. Background technique [0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. The high-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and then sprays it onto the blades, so that the rotor equipped with the blade row rotates and does external work at the same time. Steam turbines are the main equipment of modern thermal power plants, and are also used in metallurgical industry, chemical industry, and ship power plants; steam turbines are external combustion rotary machines that can convert steam heat energy into mechanical work. After the steam from the boiler enters the steam turbine, it sequentially passes through a series of annularly arranged nozzles and moving blades to convert the thermal energy of the stea...

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Problems solved by technology

[0004] When the traditional steam turbine is in use, because the internal crankshaft is in a rotating state for a long time, the crankshaft and the crankshaft fixing part are easy to wear each other and produce a gap. When the gap between the crankshaft and the fixing part is large, it will The vibration of the crankshaft is prone to occur, and the vibration of the crankshaft will accelerate the wear rate between the crankshaft and the fixed parts. Therefore, it is necessary to control the gap between the crankshaft and the fixed parts in real time to avoid the large vibration of the crankshaft and the damage of the equipment. Wear and damage, but in the prior art, vibration sensors are mostly used for the vibration detection of the crankshaft, and the equipment needs to be stopped when the vibration sensor is installed, which will seriously affect the work of the power plant and cause greater losses. Moreover, the traditional use The way the vibration sensor detects the crankshaft can only detect the vibration degree of the crankshaft, and cannot intuitively detect the amplitude and frequency of the crankshaft vibration, so the detection effect is not good

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