Summaries from two papers of the IIR co-sponsored International Conference on Compressors

Reduction of refrigeration compressors noise was an important topic addressed during the IIR-co-sponsored International Conference on Compressors (ICCR) in Xi’an, China, in July 2017.

• In his paper*, Wang Haijun stresses that as the core of an air-conditioner, the compressor is one of the most important source of noise and vibration. Especially with the widespread application of inverter technology, concentrated winding and rare earth magnet are used more and more in inverter motors, which increases the noise of compressor significantly. The noise emitted by refrigerating compressor is a complex issue, since it includes aerodynamic noise, mechanical noise and electromagnetic noise. The author proposes a motor noise calculation method based on multi-physics field simulation. The method is applied to a compressor development project, in which motor noise is calculated and compared to the test results. Results show that the peak noise has been reduced by 8dB and overall noise condition has also been improved.
  * WANG Haijun et al. Research of Refrigerating Compressor Motor Noise based on Computer Simulation Technology. In: 8^th International Conference on Compressors and Refrigeration, July 20-22, 2017, Xi'an, China. 2017, 5 p.
  Available in Fridoc: <http://bit.ly/NL72_Xian-WANG> (Accessed 2017/12/12)
  


• Cui Yidan et al paper* summarizes the current research status of noise reduction technology for household refrigerator compressors and introduces the main methods: optimizing the shell and pipe structure to reduce the compressor shell vibration caused by inertia forces and reduce the vibration of the pipe caused by the pulsation of the air flow; improving the valve structure to weaken the impact between the valve plate and the valve seat as well as the lift limiter; using of metal or viscoelastic damping materials and muffler optimization. This issue is important since the authors report that for a majority of consumers, a noise over 38 dB is not acceptable.
  * CUI Yidan et al. Review of methods and Research Status of Noise Reduction of Refrigerator Compressor. In: 8^th International Conference on Compressors and Refrigeration, July 20-22, 2017, Xi'an, China. 2017, 12 p.
  Available in Fridoc: <http://bit.ly/NL72-Xian-CUI> (Accessed 2017/12/12)