초록 ▼

A plurality of turbine buckets annularly arranged around a rotor are each provided with a ledge disposed at right angles to the outer surface of each bucket. Each ledge includes a leading end portion and a trailing end portion each formed therein with a vertical hole, leading and trailing end portio

A plurality of turbine buckets annularly arranged around a rotor are each provided with a ledge disposed at right angles to the outer surface of each bucket. Each ledge includes a leading end portion and a trailing end portion each formed therein with a vertical hole, leading and trailing end portions of the ledge of each turbine bucket extending in opposite directions on both sides of the bucket. There are provided cover pieces each interposed between ends of the adjacent two turbine buckets and formed on the upper surface with a plurality or cylindrical projections adapted to be loosely received in the vertical holes formed in the ledges of the adjacent two turbine buckets. Contact surfaces adapted to be brought into contact with the undersides of the ledges are formed on the upper surface of each cover piece and interposed between the cylindrical projections, and an upper end portion of at least one of the cylindrical projections is machined to provide an enlarged diameter projection portion so as to preclude dislodging of the projection from the hole whereby the cover piece can positively connect the adjacent two buckets together.

대표청구항 ▼

A bucket cover attachment for turbine buckets annularly arranged around a rotor to constitute a turbine bucket wheel for a steam turbine, such bucket cover attachment comprising: a plurality of ledges, each provided at the upper end of one of said plurality of turbine buckets and disposed at right a

A bucket cover attachment for turbine buckets annularly arranged around a rotor to constitute a turbine bucket wheel for a steam turbine, such bucket cover attachment comprising: a plurality of ledges, each provided at the upper end of one of said plurality of turbine buckets and disposed at right angles to an outer surface of the turbine bucket; and a plurality of bucket cover pieces, each interposed between ends of the adjacent two turbine buckets; wherein the improvement comprises a leading end portion and a trailing end portion formed in each said ledge and extending in opposite directions on both sides of the turbine bucket, a plurality of vertical holes formed in said leading end portion and said trailing end portion of the ledge, a plurality of cylindrical projections Formed on an upper surface of said bucket cover piece and adapted to be loosely received in the vertical holes formed in the ledges of the adjacent two turbine buckets, at least one of said projections being formed at its upper end with an enlarged diameter projection portion so that the bucket cover piece may be held in place by the turbine buckets, contact surfaces formed on the upper surface of said bucket cover piece and adapted to come into contact with the ledges of the adjacent two turbine buckets, and a groove interposed between said cylindrical projections for separating said contact surfaces on the upper surface of the bucket cover piece, whereby the contact surfaces can be positively brought into contact with the trailing end portion and leading end portion of the ledges of the adjacent two turbine buckets.