Detection method of turbine collision and abrasion faults

A fault detection and steam turbine technology, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as lack of vibration signals, unit operation not being noticed and valued by operators, difficult to touch and grind vibration signal analysis and research, etc. , to achieve the effect of improving the accuracy, suppressing the influence of measurement noise, and suppressing the influence of vibration

Inactive Publication Date: 2014-02-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, due to the short-term impact characteristics of the rubbing fault, it is often difficult to detect and capture this fault phenomenon using the existing vibration monitoring technology, so the impact of the rubbing on the operation of the ...

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  • Detection method of turbine collision and abrasion faults
  • Detection method of turbine collision and abrasion faults
  • Detection method of turbine collision and abrasion faults

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Embodiment Construction

[0031] The present invention provides a method for detecting rubbing faults of steam turbines. The present invention will be further described below with reference to the drawings and specific embodiments.

[0032] The principle of the present invention is that the impact friction occurring at a certain part of the steam turbine produces an instantaneous impact on the structure of the cylinder block, causing the structural vibration of the impact friction part. This vibration propagates in the cylinder block in the form of solid-borne sound, and passes through the axial ends of the cylinder block The piezoelectric acceleration sensor installed in the location can pick up the transmitted impact vibration signal, and continuously collect the cylinder structure vibration signal with a sampling frequency higher than the main natural frequency of the cylinder block. On this basis, through the analysis and extraction of the signal characteristics, the count information of the occurrence...

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Abstract

The invention belongs to the field of mechanical equipment vibration and detection, in particular to a vibration signal detection method of turbine collision and abrasion faults. Propagated collision and grinding impact vibration signals are picked up by a piezoelectric acceleration sensor installed at two axial end portions of a cylinder body, and sampling frequency higher than the main natural frequency of the cylinder body is adopted to continuously collect cylinder body structure vibration signals. According to analysis and extraction of signal characteristics on the basis, counting information of frequency, positions and collision and abrasion strength of collision and abrasion events are provided, and judging results reflecting integral statistic rules of the collision and abrasion faults are finally obtained.

Description

Technical field [0001] The invention belongs to the field of mechanical equipment vibration detection, and in particular relates to a vibration signal detection method for a steam turbine equipment collision and wear fault. Background technique [0002] In order to reduce the steam leakage loss in the steam turbine and improve the operating efficiency, the sealing gap between the rotating and stationary parts of the steam turbine unit is adjusted very small. When the steam turbine is running, under the action of high-temperature steam, the dynamic and static parts such as the rotor and the cylinder will be thermally deformed. If the high-speed rotating rotor is unevenly heated and thermally bent, a large unbalanced force will be generated, causing the center of each section of the rotor to occur Larger periodical movement deviates from the static center. When this eccentric movement is greater than the gap between the moving and static parts at the section, friction between the m...

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Application Information

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IPC IPC(8): G01H17/00G01R23/16
Inventor 柳亦兵安宏文滕伟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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