| Patent Number |
Title Of Patent |
Date Issued |
| 7270518 |
Steep angle turbine cover buckets having relief grooves |
September 18, 2007 |
| Steam turbine bucket covers have forward and aft clearance surfaces on a pressure side edge of the cover, a contact surface between the clearance surfaces and an undercut fillet between the forward clearance surface and the contact surface. The adjoining bucket cover has forward and aft |
| 7195455 |
Application of high strength titanium alloys in last stage turbine buckets having longer vane le |
March 27, 2007 |
| A new high-strength titanium-based alloy bucket specifically suited for use as the last stage buckets in steam turbine engines having vane lengths of about 40 inches or greater and the method for forming such bucket. Exemplary buckets according to the invention are formed from a tita |
| 7147437 |
Mixed tuned hybrid blade related method |
December 12, 2006 |
| A steam turbine blade includes a shank portion and an airfoil portion. The airfoil portion is formed with at least one pocket filled with a polymer filler material chosen as a function of natural frequency impact on the turbine blade or as a function of the damping characteristics of the |
| 7097428 |
Integral cover bucket design |
August 29, 2006 |
| A bucket for use on a steam turbine rotor wheel, the bucket comprising a shank portion and an airfoil portion, the airfoil portion having a radially outer tip with a tip cover adapted to be engaged, in use, by a similar tip cover on an adjacent bucket, wherein a radial step is formed |
| 6854959 |
Mixed tuned hybrid bucket and related method |
February 15, 2005 |
| A steam turbine rotor wheel includes a plurality of buckets secured about a circumferential periphery of the wheel, each bucket comprising a shank portion and an airfoil portion, the plurality of buckets including two groups of buckets having respective different predetermined resonant |
| 6814543 |
Method and apparatus for bucket natural frequency tuning |
November 9, 2004 |
| A method of modifying a rotor blade, and a rotor blade are provided. The rotor blade is for a steam turbine and it is modified to facilitate altering a natural vibratory frequency of the rotor blade, the rotor blade includes a leading edge, a trailing edge, a first sidewall, and a second |
| 6481972 |
Turbine bucket natural frequency tuning rib |
November 19, 2002 |
| A tuning rib is added preferably in the aft cavity of a cored turbine bucket to alter the bucket's natural frequencies. The tuning rib may be a solid rib or a segmented rib and is particularly suited for altering high order frequency modes such as 2T, 4F and 1-3S. As such, detrimental |
| 6478540 |
Bucket platform cooling scheme and related method |
November 12, 2002 |
| A turbine bucket includes an airfoil extending from a platform, having high and low pressure sides; a wheel mounting portion; a hollow shank portion located radially between the platform and the wheel mounting portion, the platform having an under surface. An impingement cooling plate is |
| 6464461 |
Steam cooling system for a gas turbine |
October 15, 2002 |
| The steam cooling circuit for a gas turbine includes a bore tube assembly supplying steam to circumferentially spaced radial tubes coupled to supply elbows for transitioning the radial steam flow in an axial direction along steam supply tubes adjacent the rim of the rotor. The supply tub |
| 6390774 |
Gas turbine bucket cooling circuit and related process |
May 21, 2002 |
| A turbine bucket includes an airfoil portion having leading and trailing edges; at least one radially extending cooling passage within the airfoil portion, the airfoil portion joined to a platform at a radially inner end of the airfoil portion; a dovetail mounting portion enclosing a coo |
