Patent ID: 7559742
Filing Date: 2009-07-14
Classification: F04D,F05D

Abstract:
1. An inlet casing provided for sucking fluid into a sectional opening of fluid machinery for boosting up the fluid through rotation of an impeller mounted on a rotary shaft, comprising a suction passage arranged being orthogonal to the rotary shaft on an upstream side in a stream of the fluid directed toward the fluid machinery, and an internal passage connected to the suction passage, the internal passage being formed in a spiral shape so as to induce a swirl stream orthogonal to the rotary shaft of the fluid machinery, wherein a guide vane is provided in the vicinity of an inlet port of the internal passage to distribute flow rates in the swirl stream of the fluid in the internal passage between a swirl center side and a swirl outer peripheral side of the swirl stream, and to cause the fluid flowing from the suction passage into the internal passage to deflect into a swirling direction of the swirl stream in the internal passage.