关键词: 冰箱高频噪声, 往复式压缩机, 轴系动平衡, 滑动轴承, 最小油膜厚度

Abstract: Reciprocating compressor is the core component of the refrigeration system in the refrigerator. In the analysis of noise sources in the refrigerator system, it is generally believed that the high-frequency noise source above 2 kHz is the compressor. The high-frequency noise source of the reciprocating compressor can be mainly divided into aeroacoustic noise, electromagnetic noise, and mechanical noise. Among the many excitations in the moving parts of the compressor, the sliding bearing force between the crankshaft spindle and the crankcase spindle hole is the most important excitation source. Take the shaft system of a certain reciprocating compressor as the research object, and through the optimization of the dynamic balance of the compressor and the improvement of the lubrication of the main spindle hole sliding bearing, the dynamic simulation results show that under the optimization scheme, the minimum oil film thickness of the main spindle increases by 3.7%, thereby reducing the vibration and lowering the high-frequency noise of the compressor. The noise test results show that the noise of the compressors in the frequency band of 2500 Hz~8000 Hz is reduced by more than 2 dB(A), and the vibration is reduced by 47.2%. The technical solution and analysis method can provide reference for the subsequent dynamic balance design and high-frequency noise improvement of reciprocating compressors.

Key words: Refrigerator system high frequency noise, Reciprocating compressor, Dynamic balance, Sliding bearing, Minimum oil film thickness