Abstract: To clarify the changing trend of compressor performance after the removal of the accumulator in the twin cylinder large rotor compressor, the original accumulator of the compressor was replaced with an F-type suction pipe for performance testing. Through experiments, it was found that the high-frequency performance deteriorated significantly when the F-type suction pipe replaced the original liquid reservoir. Therefore, focuses on studying the impact of the F-type suction pipe on the high-frequency performance of the compressor. Uses CFD simulation technology to discover that the main reason for the deterioration of high-frequency performance after replacing the reservoir with an F-type suction pipe is that the F-type suction pipe does not have the phenomenon of suction acceleration inside the original reservoir, and there is a phenomenon of gas reflux inside the pipe. At the same time, it was found that the diameter and length of the F-type suction pipe cannot alleviate the attenuation of high-frequency capability, but the purpose of alleviating high-frequency capability attenuation can be achieved by using a tapered pipe form to increase the suction flow rate or reduce the loss along the inside of the pipe.

Key words: Rotary compressor, F-type suction pipe, Compressor performance, CFD simulation technology