| 摘要 |
<p>An impeller for a centrifugal pump is disclosed for attenuating the effects of pressure and flow surges experienced by the pump. The impeller (12) includes a rotatable impeller shaft (22) to which a plurality of circumferentially-spaced vanes (24) are mounted for rotation therewith, the vanes extending outwardly relative to the impeller shaft and each including first and second axially spaced edges. First and second axially-spaced cover members (30,32) are provided for the plurality of vanes, the cover members being mounted for rotation with the impeller shaft and extending outwardly relative to the axial direction of the impeller shaft. The first cover member is disposed adjacent to first edges of the vane and the second cover member is disposed adjacent to second edges of the vane so as to provide an impeller chamber between the first and second cover members which is divided into subchambers by the vanes. One of the cover members (30) includes a centrally disposed opening therethrough for admitting into the impeller chamber to then be conducted outwardly upon rotation of the impeller shaft. Also, the first cover member (30) is constructed and mounted relative to the vanes so that a portion(46) thereof is free to flex axially away from respective portions of the first edges of the vanes in response to fluid pressure pulsations within the impeller chamber to temporarily increase the distance between the portion of the first cover member and the respective portions of the first edges of the vanes.</p> |
