抄録
R407C and R410A have been widely used as alternative refrigerants for air conditioners. This paper reports the noise characteristics of a scroll compressor with a discharge check valve when R410A is applied. Since a scroll compressor has a fixed compression ratio, the excessive motion of a check valve occurs under the over compression and under-compression conditions. Moreover, the velocity of the motion is higher in case of using R410A than in case of using R22 or R407C. In this paper, we measured the motion of a check value (a reed valve) by using a gap sensor and also measured the noise of a compressor under various operating conditions. The relationship between the noise and each condition has been investigated. Consequently we have found that we can reduce the noise of a scroll compressor by the optimization of compression ratio.
