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Hydraulic machinery cavitation destruction on-line monitoring method and diagnosis apparatus

A technology of cavitation cavitation and hydraulic machinery, which is applied in the field of online monitoring and diagnosis technology and devices, can solve the problems of not testing high-frequency noise signals, high-frequency impact force acceleration signals, fluid mechanical energy characteristics, pressure pulsations, etc., to improve safety and The effect of service life

Inactive Publication Date: 2003-03-12
TSINGHUA UNIV
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Problems solved by technology

Documents "INSTRUMENTSYSTEM FOR MONITORING CAVITATION NOISE" (Source: Journal of Physics E: Scientific Instruments v 15 n 7 Jul 1982 p 741-745 0022-3735) and "INSTRUMENTATION FOR REACTOR TWO PHASE NOISE DIAGion on IEEE vTransar NS-29 n 1 Feb 1981 p 709-731 0018-9499) discloses a test device for monitoring cavitation. This device only tests and analyzes the pressure pulsation caused by cavitation, and does not test the high frequency caused by cavitation. Noise signal, acceleration signal of high-frequency impact force generated by cavitation, energy characteristics of fluid machinery and pressure pulsation generated by cavitation

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  • Hydraulic machinery cavitation destruction on-line monitoring method and diagnosis apparatus
  • Hydraulic machinery cavitation destruction on-line monitoring method and diagnosis apparatus
  • Hydraulic machinery cavitation destruction on-line monitoring method and diagnosis apparatus

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[0015] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings, so as to further understand the present invention.

[0016] figure 1 It is the flow chart of the cavitation cavitation diagnosis software program. After the start, the computer continuously and automatically collects the pressure pulsation signal P of the inlet and outlet of the fluid machinery. re , upstream water level h u , the downstream water level E, the power N of the fluid machinery and the cavitation signal Cav; then calculate the working head H of the fluid machinery, the cavitation coefficient and the hydraulic loss of the water pipe; the measured cavitation signal Cav and the critical cavitation signal Cav 临界 Compare, if Cav临界 , return, and the program continues to collect data. On the contrary, calculate the metal weight loss of the fluid machine; compare the calculated metal loss weight with the set value, if the metal loss ...

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Abstract

An in-line monitor method and diagnosing apparatus for the damage of cavitation and cavitation erosion of hydraulic machinery is characterized by that the cavitation coefficient, pressure pulse, energy characteristics of hydraulic machinery, working water head, and the cavitation impact signals are measured, the lost metal weight is calculated out and the intensity of cavitation and cavitation erosion and damaged legree are analyzed.

Description

technical field [0001] The invention relates to an online monitoring and diagnosis of cavitation erosion damage of various centrifugal pumps, axial flow pumps, mixed flow turbines, axial flow turbines and other hydraulic machinery mainly used in the fields of petroleum, chemical industry, water conservancy and hydroelectric power generation technology and devices. Background technique [0002] Cavitation erosion in fluid machinery is a key factor affecting the service life and operation stability of fluid machinery, and has become one of the main problems restricting the development of large-scale fluid machinery power or capacity. At present, the research on the diagnostic method of cavitation and cavitation in fluid machinery mainly focuses on the judgment of the acceleration signal and fluid pressure pulsation signal of the high-frequency impact force generated by cavitation. For example, the literature "Signal processing techniques for the diagnosis of cavitation incept...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B11/00G01D21/02G01M99/00
CPCY02E10/226Y02E10/20
Inventor 吴玉林陈乃祥徐朝晖徐东海
Owner TSINGHUA UNIV
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