Thomas W Zagar

US Patent:

6638639, Oct 28, 2003

Filed:

Jul 6, 2000

Appl. No.:

09/509621

Inventors:

Michael A. Burke - Pittsburgh PA
Paula D. Freyer - Cranberry Township PA
Mohan A. Hebbar - Oviedo FL
Brij B. Seth - Maitland FL
Gary W. Swartzbeck - North Huntingdon PA
Thomas Walter Zagar - Winter Springs FL

Assignee:

Siemens Westinghouse Power Corporation - Orlando FL

International Classification:

B32B 1500

US Classification:

428583, 428594, 428606, 428680, 416241 R, 416 95

Abstract:

High efficiency, thin-walled turbine components such as turbine blade airfoils comprise a superalloy substrate covered by a thin skin. The thin skin may be bonded to the inner spar structure of a turbine blade airfoil by a transient liquid phase bonding process. The inner spar preferably comprises a cast single crystal nickel base superalloy. The thin skin may comprise a single crystal or polycrystalline nickel base superalloy or the like.

US Patent:

7500832, Mar 10, 2009

Filed:

Jul 6, 2006

Appl. No.:

11/481722

Inventors:

Thomas W. Zagar - Winter Springs FL, US
Rafael A. De Cardenas - Orlando FL, US

Assignee:

Siemens Energy, Inc. - Orlando FL

International Classification:

F01D 5/32

US Classification:

416221, 416 96 R, 416220 R

Abstract:

A seal plate system () for a rotor in a turbine engine. The rotor includes a rotor disc () for supporting a plurality of blades (), and an annular groove () provided in the disc () adjacent at least one end () of the disc (). A plurality of plate structures () are provided supported between the annular groove () of the disc () and a groove () formed in a platform () of the blade () adjacent an end () of the disc (). The plate structure () includes a plate () and an elongated resilient locking pointer () extending from the plate () for engaging in a lock notch () formed in an outer wall () of the annular groove (). The locking pointer () forms a self-locking feature that is biased into the lock notch () as the plate structure () is moved into position on the disc ().

US Patent:

61202495, Sep 19, 2000

Filed:

Apr 10, 1996

Appl. No.:

8/629952

Inventors:

Kent Goran Hultgren - Winter Park FL
Thomas Walter Zagar - Winter Springs FL
William E. North - Winter Springs FL
Stephen Humphrey Robbins - Thulston, GB
Graham Mark Upton - Derby, GB

Assignee:

Siemens Westinghouse Power Corporation - Orlando FL

International Classification:

F01D 518

US Classification:

416 97R

Abstract:

A turbine blade with a cooling air flow path specifically directed toward cooling the platform portion of the blade root. Cooling air passages are formed in the blade root platform just below its radially outward facing surface on an overhanging portion of the platform opposite the convex surface of the blade airfoil. Each of these passage extends radially outward from an inlet that receives a flow of cooling air, and then extends through the platform. Cavities are formed in a radially inward facing surface of an over hanging portion of the platform opposite the concave surface of the blade airfoil. An impingement plate directs cooling air as jets into these cavities. A passage is connected to the cavities and directs this cooling air through the overhanging portion of the platform opposite the concave surface.

US Patent:

63258714, Dec 4, 2001

Filed:

Jul 6, 2000

Appl. No.:

9/509622

Inventors:

Michael A. Burke - Pittsburgh PA
Paula D. Freyer - Cranberry Township PA
Mohan A. Hebbar - Oviedo FL
Brij B. Seth - Maitland FL
Gary W. Swartzbeck - North Huntingdon PA
Thomas Walter Zagar - Winter Springs FL

Assignee:

Siemens Westinghouse Power Corporation - Orlando FL

International Classification:

B23P 1504
C22F 110

US Classification:

148522

Abstract:

A method of bonding cast superalloys is disclosed. The method includes the steps of casting separate superalloy component parts, machining the mating surfaces of the separate parts in a controlled manner to avoid recrystallization of the material and to ensure a tight fit between the parts, bonding the parts together, and thermally treating the bonded component. In a preferred embodiment, the component is a turbine blade for a land-based gas turbine.

US Patent:

62736833, Aug 14, 2001

Filed:

Feb 5, 1999

Appl. No.:

9/245816

Inventors:

Thomas W. Zagar - Winter Springs FL
Anthony L. Schiavo - Oviedo FL

Assignee:

Siemens Westinghouse Power Corporation - Orlando FL

International Classification:

F01D 522

US Classification:

416193A

Abstract:

A rotating blade group 90 for a turbo-machine having an improved device for sealing the gap 110 between the edges 112,114 of adjacent blade platforms 96,104. The gap 110 between adjacent blades 92,100 is sealed by a seal pin 20 its central portion 110 and by a seal plate 58,60 at each of the front 54 and rear 56 portions. The seal plates 58,60 are inserted into corresponding grooves 62,64 formed in the adjacent edges 112,114 of adjoining blades 92,100 and held in place by end plates 40,42. The end of the seal plates 58,60 may be chamfered 78,80 to improve the seal against the end plate 40,42. The seal pin 20 provides the required damping between the blades 92,100 and the seal plates 58,60 provide improved sealing effectiveness.

US Patent:

63312174, Dec 18, 2001

Filed:

Jul 6, 2000

Appl. No.:

9/509600

Inventors:

Michael A. Burke - Pittsburgh PA
Paula D. Freyer - Cranberry Township PA
Mohan A. Hebbar - Oviedo FL
Brij B. Seth - Maitland FL
Gary W. Swartzbeck - North Huntingdon PA
Thomas Walter Zagar - Winter Springs FL

Assignee:

Siemens Westinghouse Power Corporation - Orlando FL

International Classification:

C22F 110
F01D 512

US Classification:

148522

Abstract:

Large gas turbine blades made from separate cast segments of superalloys are disclosed. The turbine blade is designed such that bond lines between adjacent segments are placed in low stress regions of the blade. The cast superalloy segments of the blades are aligned and fitted together with specified tolerances. The turbine blade segments are then joined by transient liquid phase bonding, followed by a controlled heat treatment which produces the desired microstructure in the bond region. The method allows for the production of large, high quality turbine blades by joining small, high quality cast superalloy sections, in comparison with prior attempts to cast large turbine blades as single pieces which have produced very low yields and high individual component costs.

US Patent:

58360751, Nov 17, 1998

Filed:

Dec 31, 1996

Appl. No.:

8/775822

Inventors:

Thomas John Fitzgerald - Longwood FL
Thomas Walter Zagar - Winter Springs FL

Assignee:

Westinghouse Electric Corporation - Pittsburgh PA

International Classification:

B23P 1500

US Classification:

298892

Abstract:

Processes for constructing complex turbine structures by the assembly of less complex sub-structures. The component sub-structures are bonded together at opposed mating surfaces by transient liquid bond phase techniques. The sub-structure mating surfaces are machined prior to application of the bonding material to remove oxide from the mating surfaces and ensure dimensional tolerances. Bonding material is applied to the mating surfaces by sputter deposition. Masks can be applied to the mating surfaces prior to application of the bond material so as to selectively apply bond material at only predetermined locations on the mating surface, thus eliminating excessive use of bond material for bonding the component sub-structures.