A Vibration Source in Refrigerant Compressors

During a study of vibrations of a single-cylinder refrigerant compressor of the reciprocating type, which arise after the electric power of the motor is switched off, it was observed that higher frequency damped vibrations arose distinctly in the compressor frame vibrations. This paper shows that the higher frequency damped vibrations observed were caused by torsional and transverse elastic vibrations of the crankshaft which had a rotor of larger mass at one end of the comparatively long and slender shaft. Moreover, it is confirmed that the crankshaft can be one of the major vibration sources which cause higher frequency vibrations of the compressor in constant operation.