Turbine rotor blade having integral tenon thereon and split shroud ring associated therewith

An axial flow turbine comprising:

• a casing
• a rotor shaft extending centrally and axially through said casing,
• a plurality of substantially radially extending rotating blades mounted on said rotor, each of said blades having an integral tenon member mounted thereon,
• said tenon comprising a stem portion and an integral bulbous cap portion, said stem portion having an upstream and a downstream surface thereon,
• a substantially annular shroud member subtending a predetermined number of said plurality of blades, said shroud member comprising a first and a second axial segment, said first axial segment having openings therein sized to accommodate said upstream surface of said stems of said tenons disposed on said blades subtended by said shroud, said second axial segment having openings therein sized to accommodate said downstream surface of said stems,
• said first and second segments disposed so that engagement of said first segment with said upstream surface of said tenon stem and engagement of said second segment with said downstream surface of said tenon stem causes said shroud segments to abut along a substantially circumferential interface and dispose the underside of said bulbous cap in simultaneously axially and circumferentially overlapping engagement with said abutted shroud,
• an inclined surface extending circumferentially about the axially downstream edge of said first shroud segment,
• an inclined surface extending circumferentially about the axially upstream edge of said second shroud segment,
• said inclined surfaces cooperating to define a groove extending circumferentially between the abutting shroud segments, and,
• a fastener disposed in said groove to firmly secure said first segment to said second segment.