Patent ID: 8105012
Filing Date: 2012-01-31
Classification: F04D

Abstract:
1. An adjustable bleed apparatus for bleeding air to or from an impeller inlet region of a centrifugal compressor, the compressor including a compressor impeller rotatable about an axis and having a plurality of blades, an annular shroud surrounding the impeller, and a fixed intake casing, the shroud, impeller and blades defining a flow path through the compressor, the apparatus comprising: an annular support member configured for mounting to the fixed intake casing; a downstream annular shroud segment connected to the annular support member by a first plurality of connections proximate an upstream end of the downstream annular shroud segment, a downstream end of the downstream shroud segment being unconstrained; and an upstream annular shroud segment having a plurality of bridge members at a downstream end of the upstream shroud segment, the bridge members mounting a flange, the flange being connected to the annular member and the downstream shroud segment by the plurality of first connections, wherein each of the first connections is configured to space apart the downstream end of the upstream shroud segment from the upstream end of the downstream shroud segment a distance in the axial direction, the spaced-apart distance comprising the width of a segmented annular bleed slot for bleeding air to or from the impeller inlet region past the bridge members, and wherein each of the first connections also is configured to provide an adjustable spaced-apart distance.