Full-scale synchronous monitoring of pressure-valve-vibration coupling in rotary compressors for noise control

Abstract

With the increasing demand for high-efficiency refrigeration systems, rotary compressors are operated at progressively higher speeds, leading to intensified vibration and noise. The impact vibration induced by the discharge valve has become a major source of internal excitation. However, existing experimental studies mostly focus on shell vibration or radiated sound, failing to isolate and quantify internal vibration induced by valve. In this study, a full-scale experimental platform was developed to synchronously capture the in-cylinder pressure pulsation, valve lift, and internal vibration of compressor. The compressor was structurally modified to accommodate high-precision sensors without compromising its mechanical integrity, enabling reliable observation of the internal dynamic behavior. The results confirm that the constructed full-scale synchronous measurement platform enables accurate acquisition of the three key physical quantities, providing reliable data for analyzing valve-induced impact mechanisms. Experiments show that intensified over-compression and delayed closure at high speeds jointly amplify impact vibration, while increasing valve thickness enhances stiffness and effectively suppresses it. The study reveals a clear “pressure–valve–vibration” coupling chain, providing important experimental evidence for understanding the formation mechanism and key influencing factors of internal impact vibration in high-speed rotary compressors, and offering guidance for future structural optimization and vibration control design.