Centrifugal compressor impeller with nonlinear backwall
AssigneeIngersoll-Rand Industrial U.S., Inc.
InventorNoel Blair
Life of this patent
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Abstract
A centrifugal compressor impeller includes a plurality of blades on a front side that extend from a first axial side to an outer radial end of the impeller. The centrifugal impeller includes a back side having a nonlinear backwall. The backwall can include a flat area hear a bore of impeller, a flat area near a tip of the impeller, and a convex surface between the flat areas of the bore and the tip. In some forms the impeller further includes a concave surface between the convex surface and the tip to form an s-shape. A transition or inflection point can denote the change from convex to concave. The convex and/or concave surfaces can take any variety of forms such as constant radius sections and/or compound curves.
Claims20
An apparatus comprising:
- a centrifugal impeller having a backwall side, the backwall side having a backwall and a hub region configured with a bore to be affixed to a rotatable shaft, the backwall of the centrifugal impeller defined by:
- a flat area in the hub region that extends outward from an outer diameter of the bore to a first location;
- and
- a compound curve located between the first location and a second location in the centrifugal impeller,
- wherein the compound curve includes a concave curve at a location radially outward of a convex curve.
An apparatus comprising:
- a centrifugal impeller having a backwall side, the centrifugal impeller having a bore hole and a bore hole flat area on the backwall side surrounding the bore hole, the backwall defining a compound curve including a convex region and a concave region, the concave region located radially outward of the convex region.
An apparatus comprising:
- a centrifugal compressor impeller having a backwall disposed on a back side, the backwall having a central area surrounding a bore of the centrifugal compressor impeller and a curvilinear extension extending from the central area toward a tip of the centrifugal compressor impeller, wherein the curvilinear extension extends radially outward and axially towards the front side, defining a convex region;
- wherein the backwall defines a compound curve, the compound curve including a concave region located radially outward of the convex region.
Dependencies are inferred from the claim text.