Thermal expansion of the rotor has a great impact on safe operation

Vibration and friction occur at the maximum part of the bending at high speed. If the process conditions are not quickly corrected, a yin and yang screw bite will occur. It can be seen from the on-site recording that the vibration of the compressor is reduced as the suction pressure drops. At the maximum suction pressure, the compressor vibration tends to be normal. Facts have proved that the process production conditions fluctuate and the compressor suction pressure exceeds the standard, which has a major impact on the smooth operation of the compressor.

The radial load can be increased by several thousand Newtons on the rotor, which easily causes the rotor to lose its original stiffness, causing elastic bending, impaired motion accuracy, and then vibration, friction, and accompanying sound. When the suction pressure is gradually reduced, the rotor deformation disappears, the stiffness is restored, and the vibration of the body returns to the normal state. The portion of the rotor where the maximum bending deformation is likely to occur near the exit of the rotor.

Due to the fluctuation of the operating temperature, or the deposition of sludge in the cooler, the cooling effect of the cooler is lowered or the temperature of the circulating water for the summer cooling is high, etc., the temperature of the gas at the inlet of the compressor is increased. At that time, the temperature rise of the outlet gas after the two-stage compression of the raw material gas is very high. Fast, easy to cause thermal expansion of the rotor, including radial expansion of the rotor and tooth thickness expansion. This expansion causes the assembly gap between the rotors and between the rotor and the housing to become small, resulting in a decrease in assembly accuracy, thereby affecting the normal operation of the compressor. The thermal expansion of the rotor has a great influence on the safe operation, and cooling measures must be taken to ensure the normal operation of the compressor. Compressor failure precursors tend to vibrate and gradually increase. Increasing the vibration detection during compressor operation and keeping track of the operating state are also important to prevent accidents.

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