Detection method of turbine collision and abrasion faults

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...

AI Technical Summary

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 unit is often not noticed and valued by the operating personnel

At the same time, due to the lack of vibration signals when the actual unit is rubbed, it is difficult to analyze and study the characteristics of the vibration signal and the law of rubbing

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