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Vibration detection device and abnormality determination system

A technology of vibration detection and vibration wave, which is applied in the direction of measurement device, vibration measurement in fluid, measurement vibration, etc., can solve the problems of inability to check rotating machinery in real time, long processing time, etc., and achieve real-time detection and shorten the time.

Active Publication Date: 2019-12-03
MITSUBISHI ELECTRIC ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In addition, there is a problem that the rotating machinery cannot be inspected in real time while the above arithmetic processing is performed because the envelope processing and FFT require a long processing time.

Method used

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  • Vibration detection device and abnormality determination system
  • Vibration detection device and abnormality determination system
  • Vibration detection device and abnormality determination system

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Embodiment approach 1

[0028] figure 1 It is a block diagram showing the configuration of the abnormality determination system 1 according to Embodiment 1 of the present invention. The abnormality determination system 1 is a system for determining an abnormality of a rotary machine based on vibration generated by the rotation of the rotary machine. Rotating machinery includes motors, reducers, cutting machines, pumps, and turbines. For example, when a bearing wears and an abnormality occurs, the vibration generated by the rotation of the rotary machine changes. The abnormality determination system 1 determines an abnormality of a rotating machine based on a change in vibration generated from a normal rotating machine. In addition, the abnormality determination system 1 includes a vibration detection device 2 and an abnormality determination unit 3 as constituent elements. The vibration detection device 2 includes a sensor unit 20 , an extraction unit 21 , an amplification unit 22 , an A / D convers...

Embodiment approach 2

[0063] Image 6 It is a block diagram showing the configuration of a vibration detection device 2A according to Embodiment 2 of the present invention. Image 6 in, right with figure 1 The same constituent elements are given the same reference numerals, and explanations thereof are omitted.

[0064] The vibration detection device 2A includes a sensor unit 20 , an extraction unit 21 , an amplification unit 22 , a filter unit 25 , and a comparison unit 26 . The filter unit 25 performs full-wave rectification or half-wave rectification on the sine wave signal amplified by the amplifying unit 22, and performs filtering (direct-current conversion) by a capacitor. The comparison unit 26 inputs a reference signal to be compared from inside or outside the system, compares it with the output signal of the filter unit 25, and determines whether the level is higher or lower than the reference signal. The determination result is output from the comparison unit 26 as an evaluation criter...

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Abstract

In the present invention, a sensor unit (20) has an oscillation structure that oscillates as a result of vibration waves generated as a result of the rotation of a rotating machine. An extraction unit(21) extracts an oscillation signal for a resonant frequency of the sensor unit (20). An amplification unit (22) amplifies the oscillation signal extracted by the extraction unit (21). An A / D conversion unit (23) converts the amplified oscillation signal into a digital signal. A calculation unit (24) calculates an evaluation value expressing the change over time of the oscillation signal that hasbeen converted into a digital signal.

Description

technical field [0001] The present invention relates to a vibration detection device for detecting vibration generated by rotation of a rotary machine, and an abnormality determination system including the vibration detection device. Background technique [0002] Conventionally, an apparatus for determining an abnormality of a rotary machine based on a change in vibration generated by the rotation of the rotary machine has been proposed. [0003] For example, the vibration inspection device described in Patent Document 1 obtains a power spectrum corresponding to a frequency component related to vibration generation based on a power spectrum obtained by performing frequency analysis on the intensity of vibration detected by a sensor from a rotating member, and Calculate statistics. The rotating part is a rotating machine with a rotating mechanism, and the sensor detects the vibration generated by the rotation of the rotating part. Statistical quantities are the root mean sq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G01M99/00
CPCG01H3/12G01M13/028
Inventor 篠原慎二波多野照
Owner MITSUBISHI ELECTRIC ENG CO LTD
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