| 摘要 |
PURPOSE:To restrain the oscillating power of labyrinth seal by a simple structure by a method wherein a plurality of fins are provided in a clearance between the outer surface of a cover or the like for an impeller and the surface of a casing, which is opposing to the outer surface, and a cavity is formed between the outside rims of respective fins and the surface of the casing. CONSTITUTION:A plurality of fins 12, extending radially in planes substantially vertical to the axial center of a rotary shaft 1, are provided in the clearance 10 between the outer surface of the cover 33 for the impeller 3 and the surface 22 of the casing, which is opposing to the outer surface of the cover 33, with predetermined intervals along the peripheral direction. A plurality of fins 13, extending radially in surfaces substantially vertical to the axial center of the rotary shaft 1, are also provided in the clearance 8 between the outer surface of the disc 31 and the surface 21 of the casing, which is opposing to the outer surface of the disc 31, with predetermined intervals along the peripheral direction. The cavities 14, 15 are formed between the outside rims of respective fins 12, 13 and the surfaces 22, 21 of the casing respectively. According to this method, the flow directions of leaked gas flowed into the clearances 8, 10 are regulated by respective fins 12, 13 to reduce the oscillating power generated in the labyrinth seals 6, 7.
|
