Shaft bearing clearances for an hermetic compressor

摘要

Hermetic compressor including a hermetic container; a rotation drive unit provided at an inner space of the hermetic container; a rotation shaft combined with the rotation drive unit; a compression mechanism combined with the rotation shaft to inhale and compress refrigerant; a first bearing fixed to the compression mechanism to support the rotation shaft; and a second bearing fixed to the hermetic container to support an end portion located apart from the first bearing on the rotation shaft, wherein when an inner diameter of the second bearing is D (µm), a diameter of the rotation shaft is d (µm), and a normal clearance between the second bearing and the rotation shaft is C 0 in case where the rotation shaft is vertically located at an inner portion of the second bearing, the compressor satisfies the relation of C 0 < D - d < 90 µm + d/1000.