US20070122274A1 - Tip shroud attachment for stator vane - Google Patents
Tip shroud attachment for stator vane Download PDFInfo
- Publication number
- US20070122274A1 US20070122274A1 US11/288,400 US28840005A US2007122274A1 US 20070122274 A1 US20070122274 A1 US 20070122274A1 US 28840005 A US28840005 A US 28840005A US 2007122274 A1 US2007122274 A1 US 2007122274A1
- Authority
- US
- United States
- Prior art keywords
- bushing
- tip shroud
- assembly
- shroud segment
- tip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/042—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/20—Manufacture essentially without removing material
- F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
- F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
Definitions
- This invention relates to turbine stator vanes and, particularly, to a mechanical attachment between a tip shroud segment and a group of stator vanes.
- Tip shrouds on stator vanes provide a deterministic flow path for the particular stator stage, and also serve to increase the stiffness of the vanes. It is customary to assemble arcuate shroud segments over a number of vanes (e.g., 5, 7 or more), with the segments collectively forming a 360° shroud. The tip shroud segments are typically welded to the tips of the vanes.
- each vane within a group of vanes to be covered by the shroud segment has a projecting tenon at its tip.
- the shroud segment is formed with corresponding holes that align with the tenons of the respective vanes.
- a bushing is seated in each of the shroud segment holes, and each bushing is formed with a center opening for receiving a respective one of the tenons.
- the center opening is counterbored, leaving an internal shoulder or seat for the tenon.
- the bushing is also formed with an external shoulder that allows the bushing to engage a shoulder surface of the corresponding shroud segment hole.
- This arrangement permits the bushing to be inserted into the shroud segment hole in a direction opposite the insertion direction of the vane tenons, with the external shoulder providing a stop limit to the bushing insertion.
- the vane tenons are subsequently welded to the internal bushing seat. Note that the bushings are not otherwise attached directly to the shroud segment but are nevertheless held in place radially by the tenon welds in one direction and the external shoulder engagement in the opposite direction.
- the present invention relates to a stator vane segment and tip shroud segment assembly comprising: a plurality of vanes, each having an airfoil portion and a radially inner tip, each tip formed with at least one radially inwardly projecting tenon; and a tip shroud segment extending over the radially inner tips of the vanes, said tip shroud segment formed with a plurality of holes, each hole fitted with a bushing that receives a respective one of the tenons.
- the invention in another aspect, relates to a stator vane segment and tip shroud segment assembly comprising: a plurality of vanes, each having an airfoil portion and a radially inner tip, each tip formed with at least one radially inwardly projecting tenon; a tip shroud segment extending over the radially inner tips of the vanes; the tip shroud segment formed with a plurality of holes, each hole fitted with a bushing that receives a respective one of the tenons; wherein the bushing is formed with an internal shoulder on which the respective tenon is seated; and wherein each bushing is formed with an external shoulder engaged by the tip shroud segment.
- the invention in still another aspect, relates to a stator vane segment and tip shroud segment assembly comprising: a plurality of vanes, each having an airfoil portion and a radially inner tip, each tip formed with at least one radially inwardly projecting tenon; a tip shroud segment extending over the radially inner tips of the vanes, the tip shroud segment formed with a plurality of holes, each hole fitted with a bushing that receives a respective one of the tenons; wherein each bushing is formed with an external shoulder engaged by the tip shroud; and wherein each bushing is formed with a center hole counterbored to provide an internal shoulder that provides a seat for the respective tenon and wherein the tenon is welded to the bushing at the internal shoulder.
- FIG. 1 discloses a perspective view of a shrouded stator vane segment in accordance with an exemplary embodiment of the invention
- FIG. 2 is a cross-section taken along the line 2 - 2 of FIG. 1 ;
- FIG. 3 is a partial cross-section taken along the line 3 - 3 in FIG. 1 ;
- FIG. 4 is a perspective view of another exemplary embodiment of the invention.
- FIG. 5 is an enlarged detail similar to FIG. 3 but taken from the assembly shown in FIG. 4 ;
- FIG. 6 is a perspective view of still another embodiment of the invention.
- a stator vane and tip shroud segment assembly 10 includes a plurality of stator vanes 12 , each of which includes a dove tail mounting portion 14 , an airfoil portion 16 , and a radially projecting tenon 18 ( FIG. 2 ) that projects from the radially inner tip 20 of the vane.
- the tenon 18 is round or oval in cross section and is formed approximately intermediate the forward and trailing edges 22 , 24 of the airfoil portion.
- An arcuate tip shroud segment 26 spans and is attached to a selected member of stator vanes 12 , such that the collective stator vane and tip shroud segments will form a 360° stator assembly.
- the arcuate tip shroud segment 26 is formed with a plurality of holes 28 that are appropriately located to align with the stator tenons 18 .
- the holes 28 are counterbored in a radially outward direction to create a radially inwardly facing shoulder 30 that is adapted to be engaged by a corresponding radially outwardly facing shoulder 32 on a bushing 34 .
- the bushing 34 is correspondingly shaped to be received in the segment hole 28 (i.e., round or oval), and, as already indicated above, is formed with an external shoulder 32 that engages the corresponding shoulder 30 on the arcuate tip shroud segment 26 .
- the bushing 34 is also formed with a center opening 36 that is counterbored to provide an annular (or oval)-shaped, radially outwardly facing seat 38 that is adapted to be engaged by the marginal edge of a respective tenon end face 40 .
- the airfoil tenons 18 are inserted into the bushing in direction B until the tenons are fully engaged with the seats 38 . Subsequently, each airfoil tenon 18 is fixed to the bushing at the seat 38 by weld 42 . It is significant that the bushing is not otherwise fixed to the tip shroud segment 26 . As a result, some degree of movement between the airfoil portion 16 and the tip shroud segment 26 is permitted via bushing 34 , thereby reducing stresses during operation. Note that the bushing is recessed relative to the radially inner face of the shroud segment so as not to protrude into the gas flowpath.
- the bushing may be constructed of 316 Stainless Steel while the airfoil portion 16 (including the tenons 18 ) and the tip shroud segment 26 may be constructed of a harder 403 Stainless Steel, but the material compositions may vary.
- FIGS. 4 and 5 illustrate another embodiment of a vane and tip shroud segment assembly 110 where the shapes of the tip shroud segment, bushing, and airfoil tenon as shown vary somewhat from the embodiment shown in FIGS. 1-3 . Otherwise, the components and the interaction between the tip shroud segment, airfoil portion and bushing remains as previously described. For convenience, similar reference numerals are used, but with the prefix “1” added, to designate corresponding features, but no further description is required.
- FIG. 6 illustrates another vane segment configuration that incorporates the subject invention.
- similar reference numerals are used to designate similar components, where applicable, but with the prefix “2” added.
- the vane and tip shroud segment assembly 210 incorporates bushings 234 as described in connection with FIGS. 1-3 and this aspect of the assembly need not be repeated here.
- the portion (or dovetail mounting portions) 214 of the vanes are ganged together via a strap 244 and a plurality of bolts 246 .
- the tenons could be formed with subtenons that project beyond the tenon end face and the extended subtenon may then be cold formed about the bushing end face.
- the tenon could be formed with a tapped hole with a bolt passing through the center opening of the bushing and into a threaded hole in the tenon.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/288,400 US20070122274A1 (en) | 2005-11-29 | 2005-11-29 | Tip shroud attachment for stator vane |
EP06124935A EP1790827B1 (en) | 2005-11-29 | 2006-11-28 | Tip shroud attachment for stator vane |
DE602006006271T DE602006006271D1 (de) | 2005-11-29 | 2006-11-28 | Deckbandbefestigung für eine Leitschaufel |
JP2006320957A JP2007146848A (ja) | 2005-11-29 | 2006-11-29 | ベーン用の先端シュラウド取付け装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/288,400 US20070122274A1 (en) | 2005-11-29 | 2005-11-29 | Tip shroud attachment for stator vane |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070122274A1 true US20070122274A1 (en) | 2007-05-31 |
Family
ID=37695991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/288,400 Abandoned US20070122274A1 (en) | 2005-11-29 | 2005-11-29 | Tip shroud attachment for stator vane |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070122274A1 (ja) |
EP (1) | EP1790827B1 (ja) |
JP (1) | JP2007146848A (ja) |
DE (1) | DE602006006271D1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100135782A1 (en) * | 2007-10-15 | 2010-06-03 | Ikuo Nakamura | Assembling method of stator blade ring segment, stator blade ring segment, coupling member, welding method |
US20100196149A1 (en) * | 2008-12-12 | 2010-08-05 | United Technologies Corporation | Apparatus and Method for Preventing Cracking of Turbine Engine Cases |
DE102015205424A1 (de) * | 2015-03-25 | 2016-09-29 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Nachleitrad |
WO2019147219A1 (en) | 2018-01-23 | 2019-08-01 | Siemens Aktiengesellschaft | Slide on shroud cover segments for gas turbine compressor stator vanes |
US11260328B2 (en) | 2016-11-11 | 2022-03-01 | Briggs & Stratton, Llc | Cyclonic air filter assembly for an engine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8696311B2 (en) | 2011-03-29 | 2014-04-15 | Pratt & Whitney Canada Corp. | Apparatus and method for gas turbine engine vane retention |
US9506361B2 (en) | 2013-03-08 | 2016-11-29 | Pratt & Whitney Canada Corp. | Low profile vane retention |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4395195A (en) * | 1980-05-16 | 1983-07-26 | United Technologies Corporation | Shroud ring for use in a gas turbine engine |
US4798320A (en) * | 1985-09-20 | 1989-01-17 | Allied-Signal Inc. | Ceramic-metal brazed joint for turbochargers |
US4832568A (en) * | 1982-02-26 | 1989-05-23 | General Electric Company | Turbomachine airfoil mounting assembly |
US5411368A (en) * | 1993-11-08 | 1995-05-02 | Allied-Signal Inc. | Ceramic-to-metal stator vane assembly with braze |
US5421703A (en) * | 1994-05-25 | 1995-06-06 | General Electric Company | Positively retained vane bushing for an axial flow compressor |
US5593275A (en) * | 1995-08-01 | 1997-01-14 | General Electric Company | Variable stator vane mounting and vane actuation system for an axial flow compressor of a gas turbine engine |
US6086327A (en) * | 1999-01-20 | 2000-07-11 | Mack Plastics Corporation | Bushing for a jet engine vane |
US6269540B1 (en) * | 1998-10-05 | 2001-08-07 | National Research Council Of Canada | Process for manufacturing or repairing turbine engine or compressor components |
US6413043B1 (en) * | 2000-11-09 | 2002-07-02 | General Electric Company | Inlet guide vane and shroud support contact |
US6494683B1 (en) * | 1998-10-20 | 2002-12-17 | General Electric Company | Repaired turbine rotor wheel |
US6526657B2 (en) * | 2001-05-07 | 2003-03-04 | General Electric Company | Methods for automated peening of tenons connecting turbine buckets and cover plates |
US6682299B2 (en) * | 2001-11-15 | 2004-01-27 | General Electric Company | Variable stator vane support arrangement |
-
2005
- 2005-11-29 US US11/288,400 patent/US20070122274A1/en not_active Abandoned
-
2006
- 2006-11-28 EP EP06124935A patent/EP1790827B1/en not_active Not-in-force
- 2006-11-28 DE DE602006006271T patent/DE602006006271D1/de not_active Expired - Fee Related
- 2006-11-29 JP JP2006320957A patent/JP2007146848A/ja not_active Withdrawn
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4395195A (en) * | 1980-05-16 | 1983-07-26 | United Technologies Corporation | Shroud ring for use in a gas turbine engine |
US4832568A (en) * | 1982-02-26 | 1989-05-23 | General Electric Company | Turbomachine airfoil mounting assembly |
US4798320A (en) * | 1985-09-20 | 1989-01-17 | Allied-Signal Inc. | Ceramic-metal brazed joint for turbochargers |
US5411368A (en) * | 1993-11-08 | 1995-05-02 | Allied-Signal Inc. | Ceramic-to-metal stator vane assembly with braze |
US5421703A (en) * | 1994-05-25 | 1995-06-06 | General Electric Company | Positively retained vane bushing for an axial flow compressor |
US5593275A (en) * | 1995-08-01 | 1997-01-14 | General Electric Company | Variable stator vane mounting and vane actuation system for an axial flow compressor of a gas turbine engine |
US6269540B1 (en) * | 1998-10-05 | 2001-08-07 | National Research Council Of Canada | Process for manufacturing or repairing turbine engine or compressor components |
US6494683B1 (en) * | 1998-10-20 | 2002-12-17 | General Electric Company | Repaired turbine rotor wheel |
US6086327A (en) * | 1999-01-20 | 2000-07-11 | Mack Plastics Corporation | Bushing for a jet engine vane |
US6413043B1 (en) * | 2000-11-09 | 2002-07-02 | General Electric Company | Inlet guide vane and shroud support contact |
US6526657B2 (en) * | 2001-05-07 | 2003-03-04 | General Electric Company | Methods for automated peening of tenons connecting turbine buckets and cover plates |
US6682299B2 (en) * | 2001-11-15 | 2004-01-27 | General Electric Company | Variable stator vane support arrangement |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100135782A1 (en) * | 2007-10-15 | 2010-06-03 | Ikuo Nakamura | Assembling method of stator blade ring segment, stator blade ring segment, coupling member, welding method |
US8215904B2 (en) * | 2007-10-15 | 2012-07-10 | Mitsubishi Heavy Industries, Ltd. | Assembling method of stator blade ring segment, stator blade ring segment, coupling member, welding method |
US20100196149A1 (en) * | 2008-12-12 | 2010-08-05 | United Technologies Corporation | Apparatus and Method for Preventing Cracking of Turbine Engine Cases |
US8662819B2 (en) * | 2008-12-12 | 2014-03-04 | United Technologies Corporation | Apparatus and method for preventing cracking of turbine engine cases |
DE102015205424A1 (de) * | 2015-03-25 | 2016-09-29 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Nachleitrad |
US10760590B2 (en) | 2015-03-25 | 2020-09-01 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Flow straightener |
US11260328B2 (en) | 2016-11-11 | 2022-03-01 | Briggs & Stratton, Llc | Cyclonic air filter assembly for an engine |
US11712649B2 (en) | 2016-11-11 | 2023-08-01 | Briggs & Stratton, Llc | Cyclonic air filter assembly for an engine |
WO2019147219A1 (en) | 2018-01-23 | 2019-08-01 | Siemens Aktiengesellschaft | Slide on shroud cover segments for gas turbine compressor stator vanes |
Also Published As
Publication number | Publication date |
---|---|
DE602006006271D1 (de) | 2009-05-28 |
EP1790827B1 (en) | 2009-04-15 |
EP1790827A1 (en) | 2007-05-30 |
JP2007146848A (ja) | 2007-06-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GENERAL ELECTRIC COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MOORMAN, C. DAVID;MOROSO, JOSEPH;MILLER, WILLIAM J.;AND OTHERS;REEL/FRAME:017291/0508 Effective date: 20051128 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |