| 摘要 |
PURPOSE: To reduce noise emission by forming an area covering a ring channel tapering uniformly in an area of a discharge opening in a direction from an inner edge to an outer edge of the ring channel. CONSTITUTION: A ring channel 4 having a semicircular-shaped cross section is formed in a housing 2. An inlet opening 8 and a discharging opening 9 are positioned in a peripheral direction of the housing 2. The ring channel 4 is covered by a section 11 of a cross piece-shaped interrupter 16 at a side of the channel 4 that is in proximity to an impeller 3. The section 11 extends from the area of the discharge opening 9 in an upstream direction, i.e., in a direction opposite to a compression direction. Consequently, the section 11 of the interrupter 16 tapers uniformly from an inner edge 6 to an outer edge 5 of the ring channel 4. |
