Abstract: In order to study the noise fluctuation of 800~1000 Hz during the operation of refrigerator, study the factors affecting the effect of suction muffler of refrigerator compressor. Firstly, analyze the influence of heating rate on muffler noise reduction effect. Then, the acoustic characteristics of different suction port structure and sealing of muffler are studied by using Virtual.Lab software, and the transmission loss curve is calculated. The results show that the noise of compressor and refrigerator can be reduced at the same time by improving the sealing of the muffled chamber. In the stable operation stage of the refrigerator, the average noise near 800 Hz is reduced from 31.1 dB(A) to 28.7 dB(A), with an average reduction of 2.4 dB(A), and the standard deviation is reduced from 3.87 to 1.49. The stability of the refrigerator noise is significantly improved, which provides a feasible direction for the optimization of the sound quality of the refrigerator.

Key words: Refrigerator compressor, Suction muffler, Virtual lab, Simulation, Stability