US3795462A - Vibration dampening for long twisted turbine blades - Google Patents

Vibration dampening for long twisted turbine blades Download PDF

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Publication number
US3795462A
US3795462A US00169979A US3795462DA US3795462A US 3795462 A US3795462 A US 3795462A US 00169979 A US00169979 A US 00169979A US 3795462D A US3795462D A US 3795462DA US 3795462 A US3795462 A US 3795462A
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United States
Prior art keywords
blades
ring
groups
annular array
generally
Prior art date
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Expired - Lifetime
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US00169979A
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English (en)
Inventor
W Trumpler
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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Publication date
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Publication of US3795462A publication Critical patent/US3795462A/en
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    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/22—Blade-to-blade connections, e.g. for damping vibrations

Definitions

  • This invention relates to turbine blades and more particularly to lashing long twisted turbine blades in groups.
  • annular array of circumferentially spaced twisted blades fastened to a rotor when made in accordance with this invention, are joined together in groups by a segmented ring with a small gap between adjacent groups of blades.
  • the gap is of such configuration that only a small portion thereof closes as the blades are rotated and tend to untwist as a group, thereby providing a substantially continuous ring, which cooperates with the blade grouping to reduce vibration and to still allow for thermal expansion and elastic deformation of the rotor.
  • FIG. ll shows a segment of an annular array of circumferentially spaced rotatable blades l for a steam turbine (not shown), wherein the blades 1 have a general air foil cross section, which changes shape and angle from its root 3 to its tip 5.
  • the air foil generally has a rounded leading edge 7 and a sharper trailing edge 9.
  • the blades are fastened to a rotor 11 and extend out radially therefrom.
  • Lashing rings 13 and 15 are disposed adjacent the tip end of the blades 1 and are concentric with the axis of the rotor ll.
  • the lashing rings 13 and are segments of a circular ring and are made integral with or are welded to each blade.
  • the lashing segments join the blades in groups having three or more blades therein. The number of blades in a group depending on the resonant frequency of the array of blades and the speed of the rotor.
  • the groups are separated by a small jagged gap 117 in the lashing rings 13 and 115..
  • the gaps 117 are generally V- shaped and the V generally opens in the direction of rotation of the blades.
  • the lashing rings E3 and 15 generally have an oval cross section with the major axis aligned with the axis of the rotor H1 so that the leading and trailing edges or margins I19 and M respectively are rounded edges to minimize resistance to steam flow.
  • Downstream legs 23 of the V-shaped gap are generally shorter than upstream legs 25 thereof, so that as the blades tend to untwist due to the centrifugal forces induced by rotating them, the group of blades tend to rotate clockwise as shown in FIG. 2 causing the short legs of the V-shaped gap to close.
  • the gap closes it provides a substantially continuous interlocking ring that results in snubbing and vibration dampening, which cooperates with the blade grouping, to minimize vibration of the blades and yet provides sufficient flexibility to allow for thermal expansion and contraction of the rotor.
  • Joining the blades in groups is a particularly advantageous arrangement for reducing vibration at resonant speeds, as described in the Ft. 1.
  • Ortolano et al. US. Pat. No. 3,588,278, issued June 28, 1971, and assigned to the same assignee, while the snubbing or dampening caused by the gap closing will absorb any type of vibration energy, thus minimizing the vibration stresses in the rotating blades.
  • FIG. 3 shows a modification, in which the gaps 17' generally extend across the lashing rings 13 and and intercept the margins H9 and Zll on a plane extending from the leading edge of one blade to the trailing edge of an adjacent blade.
  • the gaps generally have a loop 27 disposed generally in the center of the gap and the loop opens in the direction of rotation.
  • the loop is generally formed by drilling a hole through the lashing ring at the center of the gap and placing a disk like plug 29 in the hole and then welding the plug 29 to the lashing ring on one side of the hole.
  • the hole is sized to provide the loop shaped portion of the gap.
  • a tongue and groove arrangement could also be utilized.
  • ring is disposed adjacent the outer periphcry of the annular array of blades and each group has at least three blades therein.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US00169979A 1971-08-09 1971-08-09 Vibration dampening for long twisted turbine blades Expired - Lifetime US3795462A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16997971A 1971-08-09 1971-08-09

Publications (1)

Publication Number Publication Date
US3795462A true US3795462A (en) 1974-03-05

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ID=22618004

Family Applications (1)

Application Number Title Priority Date Filing Date
US00169979A Expired - Lifetime US3795462A (en) 1971-08-09 1971-08-09 Vibration dampening for long twisted turbine blades

Country Status (3)

Country Link
US (1) US3795462A (enrdf_load_stackoverflow)
JP (1) JPS4930702A (enrdf_load_stackoverflow)
IT (1) IT963360B (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923420A (en) * 1973-04-30 1975-12-02 Gen Electric Blade platform with friction damping interlock
US3986792A (en) * 1975-03-03 1976-10-19 Westinghouse Electric Corporation Vibration dampening device disposed on a shroud member for a twisted turbine blade
US4083655A (en) * 1975-12-29 1978-04-11 Groupe Europeen Pour La Technique Des Turbines A Vapeur G.E.T.T. S.A. Turbine rotor
US4257743A (en) * 1978-03-24 1981-03-24 Tokyo Shibaura Denki Kabushiki Kaisha Coupling devices of moving blades of steam turbines
US4386887A (en) * 1980-06-30 1983-06-07 Southern California Edison Company Continuous harmonic shrouding
US4710102A (en) * 1984-11-05 1987-12-01 Ortolano Ralph J Connected turbine shrouding
USRE32737E (en) * 1980-06-30 1988-08-23 Southern California Edison Continuous harmonic shrouding
GB2251034A (en) * 1990-12-20 1992-06-24 Rolls Royce Plc Shrouded aerofoils
JPH062501A (ja) * 1992-06-16 1994-01-11 Hitachi Ltd 軸流タービンの動翼
FR2724690A1 (fr) * 1994-09-16 1996-03-22 Mtu Muenchen Gmbh Roue mobile d'une turbomachine, notamment une turbine a ecoulement axial d'un groupe propulseur a turbine a gaz.
US6568908B2 (en) * 2000-02-11 2003-05-27 Hitachi, Ltd. Steam turbine
US20090004011A1 (en) * 2007-06-27 2009-01-01 Kabushiki Kaisha Toshiba Steam turbine, and intermediate support structure for holding row of long moving blades therein
US7931443B1 (en) 2007-07-10 2011-04-26 Florida Turbine Technologies, Inc. High twist composite blade
US20120020793A1 (en) * 2009-01-29 2012-01-26 Mccracken James Turbine blade system
US20140169974A1 (en) * 2012-12-17 2014-06-19 General Electric Company Tapered part-span shroud
CN104727858A (zh) * 2013-12-20 2015-06-24 通用电气公司 用于涡轮转子叶片的缓冲器构造
US9822647B2 (en) 2014-01-29 2017-11-21 General Electric Company High chord bucket with dual part span shrouds and curved dovetail
CN109869196A (zh) * 2019-04-18 2019-06-11 中国航发沈阳发动机研究所 一种双联或多联的叶轮机转子叶片及具有其的叶轮机

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5715151B2 (enrdf_load_stackoverflow) * 1972-01-24 1982-03-29
JPS51113002A (en) * 1975-03-03 1976-10-05 Westinghouse Electric Corp Vibration controlling device arranged at shroud portion of turbine return vane
JPS51147547A (en) * 1975-06-12 1976-12-17 Toyobo Co Ltd Process for preparing viscous liquid containing fire-proofing inorgani c oxides
JPS5497603U (enrdf_load_stackoverflow) * 1977-12-22 1979-07-10
JPS559631A (en) * 1978-07-07 1980-01-23 Shinroihi Kk Fine polymer particle with uniform particle size distribution and its production
JPS559633A (en) * 1978-07-07 1980-01-23 Shinroihi Kk Blackened fine spherical polymer particle and its production
JPS559632A (en) * 1978-07-07 1980-01-23 Shinroihi Kk Fine spherical polymer particle containing inorganic pigment and its production
JPS5659802A (en) * 1979-10-23 1981-05-23 Shinroihi Kk Microspherical polymer particle and production thereof
DE3201109A1 (de) * 1982-01-15 1983-07-28 Bayer Ag, 5090 Leverkusen Vernetzte, fuellstoffhaltige perlpolymerisate und verfahren zu ihrer herstellung
JPS58201807A (ja) * 1982-05-18 1983-11-24 Mitsubishi Monsanto Chem Co 無機充填材含有熱可塑性樹脂濃厚組成物の製造方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1304793A (en) * 1919-05-27 Turbine-bucket
US1639247A (en) * 1925-05-28 1927-08-16 Zoelly Alfred Rotor blading for rotary engines, particularly for steam turbines and gas turbines
US2283901A (en) * 1940-03-16 1942-05-26 Westinghouse Electric & Mfg Co Turbine blading
US2391623A (en) * 1943-12-08 1945-12-25 Armstrong Siddeley Motors Ltd Bladed rotor
US2510734A (en) * 1946-04-06 1950-06-06 United Aircraft Corp Turbine or compressor rotor
FR69842E (fr) * 1956-05-30 1958-12-30 Rateau Soc Amortisseurs de vibrations pour aubages mobiles de turbo-machines
US3572970A (en) * 1969-01-23 1971-03-30 Gen Electric Turbomachinery blade spacer
US3588278A (en) * 1969-03-21 1971-06-28 Westinghouse Electric Corp Blade structure for an axial flow elastic fluid utilizing machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1159965B (de) * 1961-08-10 1963-12-27 Bbc Brown Boveri & Cie Einrichtung zur Schwingungsdaempfung an einem Turbinen- oder Verdichter-Schaufelkranz

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1304793A (en) * 1919-05-27 Turbine-bucket
US1639247A (en) * 1925-05-28 1927-08-16 Zoelly Alfred Rotor blading for rotary engines, particularly for steam turbines and gas turbines
US2283901A (en) * 1940-03-16 1942-05-26 Westinghouse Electric & Mfg Co Turbine blading
US2391623A (en) * 1943-12-08 1945-12-25 Armstrong Siddeley Motors Ltd Bladed rotor
US2510734A (en) * 1946-04-06 1950-06-06 United Aircraft Corp Turbine or compressor rotor
FR69842E (fr) * 1956-05-30 1958-12-30 Rateau Soc Amortisseurs de vibrations pour aubages mobiles de turbo-machines
US3572970A (en) * 1969-01-23 1971-03-30 Gen Electric Turbomachinery blade spacer
US3588278A (en) * 1969-03-21 1971-06-28 Westinghouse Electric Corp Blade structure for an axial flow elastic fluid utilizing machine

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923420A (en) * 1973-04-30 1975-12-02 Gen Electric Blade platform with friction damping interlock
US3986792A (en) * 1975-03-03 1976-10-19 Westinghouse Electric Corporation Vibration dampening device disposed on a shroud member for a twisted turbine blade
US4083655A (en) * 1975-12-29 1978-04-11 Groupe Europeen Pour La Technique Des Turbines A Vapeur G.E.T.T. S.A. Turbine rotor
US4257743A (en) * 1978-03-24 1981-03-24 Tokyo Shibaura Denki Kabushiki Kaisha Coupling devices of moving blades of steam turbines
US4386887A (en) * 1980-06-30 1983-06-07 Southern California Edison Company Continuous harmonic shrouding
USRE32737E (en) * 1980-06-30 1988-08-23 Southern California Edison Continuous harmonic shrouding
US4710102A (en) * 1984-11-05 1987-12-01 Ortolano Ralph J Connected turbine shrouding
GB2251034A (en) * 1990-12-20 1992-06-24 Rolls Royce Plc Shrouded aerofoils
GB2251034B (en) * 1990-12-20 1995-05-17 Rolls Royce Plc Shrouded aerofoils
JPH062501A (ja) * 1992-06-16 1994-01-11 Hitachi Ltd 軸流タービンの動翼
JP2710729B2 (ja) 1992-06-16 1998-02-10 株式会社日立製作所 軸流タービンの動翼
FR2724690A1 (fr) * 1994-09-16 1996-03-22 Mtu Muenchen Gmbh Roue mobile d'une turbomachine, notamment une turbine a ecoulement axial d'un groupe propulseur a turbine a gaz.
US6568908B2 (en) * 2000-02-11 2003-05-27 Hitachi, Ltd. Steam turbine
US20090004011A1 (en) * 2007-06-27 2009-01-01 Kabushiki Kaisha Toshiba Steam turbine, and intermediate support structure for holding row of long moving blades therein
US8105038B2 (en) * 2007-06-27 2012-01-31 Kabushiki Kaisha Toshiba Steam turbine, and intermediate support structure for holding row of long moving blades therein
US7931443B1 (en) 2007-07-10 2011-04-26 Florida Turbine Technologies, Inc. High twist composite blade
US20120020793A1 (en) * 2009-01-29 2012-01-26 Mccracken James Turbine blade system
US8894353B2 (en) * 2009-01-29 2014-11-25 Siemens Aktiengesellschaft Turbine blade system
US20140169974A1 (en) * 2012-12-17 2014-06-19 General Electric Company Tapered part-span shroud
US9546555B2 (en) * 2012-12-17 2017-01-17 General Electric Company Tapered part-span shroud
CN104727858A (zh) * 2013-12-20 2015-06-24 通用电气公司 用于涡轮转子叶片的缓冲器构造
US9822647B2 (en) 2014-01-29 2017-11-21 General Electric Company High chord bucket with dual part span shrouds and curved dovetail
CN109869196A (zh) * 2019-04-18 2019-06-11 中国航发沈阳发动机研究所 一种双联或多联的叶轮机转子叶片及具有其的叶轮机
CN109869196B (zh) * 2019-04-18 2021-10-01 中国航发沈阳发动机研究所 一种双联或多联的叶轮机转子叶片及具有其的叶轮机

Also Published As

Publication number Publication date
IT963360B (it) 1974-01-10
JPS4930702A (enrdf_load_stackoverflow) 1974-03-19

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