Investigation on the Pressure Pulsation in Discharge Muffler of Rotary Compressors

摘要

Gas pulsation in the discharge side of rotary compressor is one of the main sources of noise, so the discharge muffler is widely used to decrease the gas pulsation and noise level. Investigations on pressure pulsation in the muffler can provide not only a method to evaluate the muffler design and modification, but also a base for advanced study of noise in rotary compressor. In this paper the mathematical model of pressure pulsation in the muffler is built up by Helmholtz resonator approach and coupled with the valve dynamic model and thermodynamic model in the cylinder to simulate the gas pulsation. The pressure pulsation in various cavities of mufflers are calculated and analyzed in time and frequency domain, which shows pressure pulsation in outlet cavity is decreased much more than that in inlet cavity. Experiments are also carried out to prove that the calculation models are reliable.