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A sound reduction solution of rotary compressor by experimental source analysis.

Number: 1434

Author(s) : ICHIHARA M., CHINEN T., HIRAYAMA T., KATO H.

Summary

We, Toshiba Carrier Corporation, have succeeded in reducing the sound level and improving the sound quality of outdoor unit operating sound under high-speed and high-load condition in residential inverter air conditioners by improving compressor components. In this study, we first identified the target frequency by a sensory test of the outdoor unit operating sound and analysis using a graphic equalizer. Next, we made a hypothesis that the characteristic of discharge valves in the compressor made its sound louder. To further understand the phenomenon, we observed behavior of the discharge valves with displacement sensors and measured the pressure pulsation in the compression mechanism with pressure sensors under several operation conditions. Then, we visualized the changes in the power spectrum of the pressure pulsation in compression chamber during one compressor revolution by short-time Fourier transform (STFT) of those data obtained from synchronous acquisition system. As a result, we found that the response of the discharge valve is one of the factors that worsen the pressure pulsation in the compression chambers and thus the operation sound of the outdoor unit at high-speed operation. Finally, we confirm that the sound level of the outdoor unit equipped with compressor whose discharge valve has good response is improved under high-speed and high-load conditions.

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  • Original title: A sound reduction solution of rotary compressor by experimental source analysis.
  • Record ID : 30030360
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15

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