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Parallel measurement method for bending and torsional vibration of small shaft of steam turbine based on overspeed protection signal

A technology of overspeed protection and measurement method, applied in the direction of linear/angular velocity measurement, velocity/acceleration/shock measurement, measurement device, etc., can solve the inconvenient installation of sensors, increase the cost of sensors and the measurement channel of detection instruments, and affect the vibration of the machine head. Problem status monitoring, analysis and diagnosis, etc., to avoid equipment installation problems and reduce equipment costs

Active Publication Date: 2021-12-07
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

[0004] To sum up, at present, most of the steam turbines are equipped with multiple speed probes for overspeed protection at the small shaft of the machine head, but they are not designed to install bending vibration and torsional vibration measurement probes, which affects the vibration of the machine head. Condition Monitoring and Analysis Diagnosis
If a flexural vibration torsional vibration probe is added to the small shaft, it will not only increase the cost of the sensor and the measurement channel of the testing instrument, but also the installation of the sensor is very inconvenient due to structural constraints

Method used

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  • Parallel measurement method for bending and torsional vibration of small shaft of steam turbine based on overspeed protection signal
  • Parallel measurement method for bending and torsional vibration of small shaft of steam turbine based on overspeed protection signal
  • Parallel measurement method for bending and torsional vibration of small shaft of steam turbine based on overspeed protection signal

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Embodiment Construction

[0041] In the following, combined with the accompanying drawings and taking the overspeed protection simulation signal of a steam turbine unit as an example, a parallel measurement method for bending and torsional vibration of the small shaft of the machine head based on multiple overspeed protection signals is carried out. The specific implementation process is as follows:

[0042] (1) if figure 1 As shown, the static technical parameters of the existing speed measuring gear device at the small shaft of the steam turbine head are obtained, including the number of teeth of the speed measuring gear plate 1 or the interval number of other equal parts, the radius of the shaft section, the existing eddy current sensor, photoelectric The installation angle of the velocity sensor 2 of the forms such as sensor, magnetoresistive sensor. In this example, the number of teeth of the speed measuring gear is 180 teeth, the radius of the shaft section is 200mm, and the reverse rotation dire...

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Abstract

The invention discloses a method for parallel measurement of bending vibration and torsional vibration of a small shaft of a steam turbine based on an overspeed protection signal, and belongs to the technical field of vibration measurement and signal processing of a steam turbine unit. This method uses multiple existing overspeed protection signals to obtain the bending vibration and torsional vibration signals of the small shaft of the machine head in parallel, which solves the technical problem that the vibration of the small shaft of the machine head is difficult to test; real-time demodulation of the overspeed protection signals realizes dynamic Monitor the state of bending vibration and torsional vibration at the small shaft of the machine head. Moreover, this method is completely based on the existing speed measuring gear probe at the small shaft of the machine head, without adding sensors, avoiding equipment installation problems and reducing equipment costs.

Description

technical field [0001] The invention belongs to the technical field of vibration measurement and signal processing of a steam turbine unit, and in particular relates to a parallel measurement method for bending and torsional vibration of a small shaft of a steam turbine based on an overspeed protection signal. Background technique [0002] Vibration is known as the "thermometer" of mechanical equipment, which can directly reflect the safe operation of equipment. The comprehensive measurement of bending vibration and torsional vibration is very important for the analysis, diagnosis and fault prediction of the operating state of the unit. Severe bending vibration and torsional vibration will cause bearing damage, wear of the flow part, bending of the large shaft, fatigue damage of the shaft and coupling, etc., seriously endangering the safety of equipment operation. In current engineering practice, the small shaft of the machine head is located at the outstretched end of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01D5/245G01P3/481
CPCG01D5/245G01M13/00G01P3/481
Inventor 赵文广杨建刚
Owner SOUTHEAST UNIV
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