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A wireless frequency measuring device for steam turbine moving blades

A blade and motorized technology, which is applied in the field of wireless frequency measurement devices for steam turbine motor blades, can solve the problems of measurement results that cannot be stored and printed, low measurement accuracy, and long measurement time, so as to shorten measurement time, improve accuracy and work efficiency, and avoid Effects of a wired connection

Active Publication Date: 2022-05-10
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the problems of low measurement accuracy, large human error, long measurement time, and the inability to store and print the measurement results in the measurement process of the natural frequency of the steam turbine blade in the prior art, and provides a wireless frequency converter for the steam turbine blade. frequency measuring device

Method used

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  • A wireless frequency measuring device for steam turbine moving blades
  • A wireless frequency measuring device for steam turbine moving blades
  • A wireless frequency measuring device for steam turbine moving blades

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Embodiment 1

[0025] see Figure 1-3 As shown, the present invention discloses a technical solution: a wireless frequency measuring device for steam turbine moving blades, including a wireless vibration pickup 2 arranged on the steam turbine moving blades 1, and a small Hammer 3, the wireless vibration test analyzer 4 of the wireless connection with wireless vibration pick-up; Described wireless vibration pick-up 2 is connected with wireless vibration test analyzer by wireless transmission module, and described wireless vibration test analyzer 4 comprises power supply module, A data acquisition module for collecting wireless data signals, a data processing module for processing data signals, and a signal input and output module; the data processing module includes sequentially connected amplifiers, filters, digital-to-analog converters, FFT conversion units, spectrum Analysis unit, data post-processing unit; through the data acquisition module in the wireless vibration test analyzer, the vi...

Embodiment 2

[0031] A wireless frequency measuring device for steam turbine motor blades, comprising a wireless vibration pickup 2 arranged on a steam turbine motor blade 1, a small hammer 3 positioned above the steam turbine motor blade 1 for beating the blade, and a wireless connection with the wireless vibration pickup The wireless vibration test analyzer 4; the wireless vibration pickup 2 is connected with the wireless vibration test analyzer through a wireless transmission module, and the wireless vibration test analyzer 4 includes a power module, a data acquisition module for collecting wireless data signals, A data processing module for processing data signals, a signal input and output module; the data processing module includes an amplifier, a filter, a digital-to-analog converter, an FFT conversion unit, a spectrum analysis unit, and a data post-processing unit; through a wireless vibration test analyzer The data acquisition module in the system collects the vibration signal of the ...

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Abstract

The invention discloses a wireless frequency measuring device for steam turbine motor blades, which comprises a wireless vibration picker arranged on the steam turbine motor blades, a small hammer located above the steam turbine motor blades for beating the blades, and a wireless vibration picker wirelessly connected A wireless vibration test analyzer; the data transmission between the wireless vibration pick-up and the wireless vibration test analyzer adopts a wireless connection, and the wireless vibration test analyzer is connected with a computer with spectrum analysis software through a USB data cable. The wireless vibration pickup can obtain the vibration signal of the steam turbine moving blade, and transmit the signal to the wireless vibration test analyzer. The wireless vibration test analyzer first performs noise reduction processing on the vibration signal, and then uses FFT (fast Fourier transform) Signal processing, interacting with the computer through the USB data line, the computer is installed with spectrum analysis software, which can realize functions such as control, calculation, analysis, storage, output, etc.; the combination of software and hardware, reasonable design, can improve the accuracy and work of measuring vibration signals efficiency.

Description

technical field [0001] The invention relates to steam turbines, in particular to a wireless frequency measuring device for moving blades of steam turbines, belonging to the technical field of steam turbines. Background technique [0002] The natural frequency of the blade is an important parameter reflecting the vibration characteristics of the turbine blade. Measuring the static frequency of the blade is an important means to check the installation quality of the steam turbine blade, find hidden dangers in the blade, and evaluate the safety of the blade. The traditional test method for static frequency of automotive motor blades is to adjust the output power of the signal generator so that the Lissajous figure of the oscilloscope (composed of simple harmonic vibrations with two frequencies in the direction perpendicular to each other in a simple integer ratio) A regular and stable closed curve) is a clear and stable circle or ellipse. At this time, the output frequency val...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01H17/00
CPCG01M13/00
Inventor 晏涛万忠海鲁锦陈文蔡文
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST