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Oil Membrane Oscillation Cause Analysis of a Centrifugal Compressor and Its Structural Improvement
CHEN Hong-wei
   2011, 31 (6): 176-179.   DOI: 10.3969/j.issn.1006-1355-2011.05.040
Abstract （1217）            Save
The fault of oil membrane oscillation in a centrifugal compressor of a factory in Longyan of Fujian province is analyzed. It is found that this fault is a particular one of sliding bearings operating at high rotation speeds. It usually occurs in the vicinity of twice critical rotation speed of the bearings. The characteristics of oil membrane oscillation are summarized. It is found that the first-order critical frequency component of the rotor in the frequency spectrum is the main peak value, and the locus of the bearing’s shaft is irregular and diffusive. The influential factors of oil membrane oscillation are analyzed. It is concluded that the oil membrane oscillation depends on the load, the critical speed, the bearing’s eccentricity, lubrication state, and bearing’s load characteristic coefficient. Then, the HHT method for the fault detection is proposed. It is found that with this method, the fault of oil membrane oscillation can be identified very quickly and precisely. Finally, some structural improvement measures for the centrifugal compressor are proposed for reducing the oil membrane oscillation. It is verified after half-year use that this method is simple, convenient and practical.
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《Analysis of Stall Vibration Mechanism of Centrifugal Compressor and its Improvement》
Chen Hong-wei
   2010, 30 (2): 84-87.   DOI: 10.3969/j.issn.1006-1355.2010.02.084
Abstract （2899）      PDF（pc） （1606KB）（2383）       Save
The mechanism of rotation stall of compressors produced by a factory in Longyan of Fujian province is analyzed. It is found that the air flow impacts the working surface of the blade when the wind flow reduces, while many air vortexes occur in the back surface of the blade. Thus, the net sectional area of the air flow decreases. The air bubbles induced by the vortexes translate in the sense opposite to the rotation of the impeller and cause the vibration. Summing up the type and characteristics of the rotation stall of the compressor, a method for monitoring the rotation stall signal is put forward based on Fast Fourier Transform. With this method, the omen of rotation stall can be found. With spectrum analysis, some improvement measures are proposed. This method has been proved simple, convenient and practical in recent oneyear application.
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