Abstract: Combined with the cases of the refrigerants flow noise of two kind pipes, which happened at Series Parallel Connection Node of Multi-System Refrigerator, the reasons of causing refrigerants flow noise are analyzed. And above two kinds of pipe are optimized, respectively. The result shows that fluctuation noise of two pipe style decline from 4 dB to 1 dB. In order to reduce the fluctuation of eruption noise, enough eruption space should be ensured at outlet side of capillary, where capillary and suction pipe connect. About the pipe of capillary inserted suction pipe directly, capillary need locating at center of suction pipe. Above result of the refrigerants flow noise at Series Parallel Connection Node of Multi-System Refrigerator can supply one direction for refrigerants flow noise improvement.

Key words: Multi-system refrigerator, Series parallel connection node, Refrigerants flow noise, Capillary