US3778190A - Bucket cover attachment - Google Patents

Bucket cover attachment Download PDF

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Publication number
US3778190A
US3778190A US00185670A US3778190DA US3778190A US 3778190 A US3778190 A US 3778190A US 00185670 A US00185670 A US 00185670A US 3778190D A US3778190D A US 3778190DA US 3778190 A US3778190 A US 3778190A
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US
United States
Prior art keywords
bucket
buckets
lugs
adjacent
cover
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.)
Expired - Lifetime
Application number
US00185670A
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English (en)
Inventor
J Ouellette
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
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Publication of US3778190A publication Critical patent/US3778190A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

  • ABSTRACT In a turbomachine having a turbine wheel including a rotor with a plurality of circumferentially mounted turbine buckets thereon; adjacent turbine buckets interconnected by a diagonal cover piece; a bucket cover attachment device which permits limited articulation of the buckets relative to one another as the turbine buckets twist and untwist.
  • the downstream trailing edge of one bucket is connected withthe upstream leading edge of an adjacent bucket by means of a cover piece which is fixed at each end to a respective adjacent bucket.
  • the cover piece has lugs formed at opposite endswhich are inserted through transverse holes in adjacent bucket tips and then mechanicallylfastened in compressive abutment by a peening operation. The effect of this type of connectionis to rigidly secure a bucket cover to the turbine buckets andobviate an upper tie wire.
  • FIG. 1 is a partial side elevation of a turbine rotor of the kind having diagonal bucket covers and articulator sleeve tie wires;
  • FIG. 2 is a radially inward view of two buckets of the turbine rotor in FIG. 1;
  • FIG. 3 is a top elevation view of the bucket attachment device, the dotted lines showing the final assembled position of the device.
  • FIG. 4 is a section IV-IV taken from FIG. 3.
  • a turbine wheel 11 is generally depicted as having a rotor 13, and a plurality of circumferentially mounted buckets or blades 15.
  • the buckets may be fastened to the turbine rotor by means of a dovetail connection 17 or any other similar means.
  • transverse holes 21 in the trailing portion of the tips and transverse holes 25 in the leading portion of the tips are formed at their tips portions such that the upstream and downstream bucket surfaces 27 and 29, respectively, at the bucket tips are substantially planar, parallel to each other, and perpendicular to a bucket tip surface 31.
  • Transverse holes 21 and 25 are substantially perpendicular to surfaces 27 and 29.
  • Cover piece 35 has lugs 39 and 41 projecting therefrom.
  • Lugs 39 may be of the type which will securely fasten in compressive abutment the bucket to the cover piece by mechanical upset or peening.
  • the lugs 41 in combination with the diagonal shroud cover 35 constitute the subject matter of this invention. It is possible to interchange the position of lugs 39 and 41 so that the peened lugs 39 are on the downstream side 29 of the buckets and the lugs 41 are on the upstream side 27 of the buckets.
  • lugs 41 are formed as part of the diagonal cover piece 35 andextend through holes 25 in the buckets 15.
  • the upper portion of each lug is formed with a tub recess 55 defining a peripheral wall 59.
  • the peripheral wall is rolled in such a manner that a force applied against the peripheral wall will cause the wall to spread outwardly and to form an overhang 61 (indicated by the dotted portion) thereby loosely connecting the diagonal cover to the bucket.
  • the bucket and bucket cover are loosely connected to each other. This is because the construction allows for a clearance A to be formed between the bucket surface and the overhang. When the turbine rotor is in use, this clearance allows limited play until the bucket surface contacts the overhang, at which time stresses are introduced into the turbine blades.
  • the clearance and limited play may be adjusted according to the amount the peripheral walls are spread outwardly or according to the force applied in securing the lug.
  • the turbine wheel will usually be of the type having an articulator sleeve tie wire connection.
  • the articulator sleeve allows some relative motion between buckets. As the turbine rotor changes speed, adjacent buckets will tend to twist or untwist causing a small variation in the distance between buckets which is accommodated by the clearance provided.
  • the incorporation of the present invention into the diagonal bucket cover also permits articulation because of the limited play allowed by means of the loose connection afforded by projection 41.
  • the articulation allowed by the articulator sleeve may be limited in this embodiment according to the tightness with which the projection 41 is secured.
  • said turbine wheel having a plurality of circumferentially mounted turbine buckets extending radially outwardly therefrom; a bucket cover extending diagonally between adjacent bucket tips, said bucket tips formed with transverse holes therethrough communicating the upstream side of the bucket with the downstream side of the same bucket, at least one transverse hole formed in both the leading edge and the trailing edge of each bucket; and further comprising:
  • At least one of said lugs formed with a tub recess defining a peripheral wall which is partially peened to form an overhang for partially abutting said bucket;
  • At least one pair of said lugs being loosely fastened to form a clearance between the ends of said lugs and the buckets whereby limited play is permitted between adjacent buckets to accommodate bucket twist and untwist.

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)
US00185670A 1971-10-01 1971-10-01 Bucket cover attachment Expired - Lifetime US3778190A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18567071A 1971-10-01 1971-10-01

Publications (1)

Publication Number Publication Date
US3778190A true US3778190A (en) 1973-12-11

Family

ID=22681968

Family Applications (1)

Application Number Title Priority Date Filing Date
US00185670A Expired - Lifetime US3778190A (en) 1971-10-01 1971-10-01 Bucket cover attachment

Country Status (7)

Country Link
US (1) US3778190A (enrdf_load_stackoverflow)
JP (1) JPS538010B2 (enrdf_load_stackoverflow)
CH (1) CH550935A (enrdf_load_stackoverflow)
DE (1) DE2246134C3 (enrdf_load_stackoverflow)
FR (1) FR2155308A5 (enrdf_load_stackoverflow)
GB (1) GB1367728A (enrdf_load_stackoverflow)
IT (1) IT967756B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643645A (en) * 1984-07-30 1987-02-17 General Electric Company Stage for a steam turbine
US6007296A (en) * 1997-03-08 1999-12-28 Abb Research Ltd. Guide blade for steam turbines
US20040191068A1 (en) * 2003-03-28 2004-09-30 Christoph Richter Moving-blade row for fluid-flow machines
US20100135775A1 (en) * 2008-12-01 2010-06-03 Alstom Technology Ltd Turbomachine, especially steam turbine

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4894750A (enrdf_load_stackoverflow) * 1972-03-21 1973-12-06
JPS52140707A (en) * 1976-05-19 1977-11-24 Toshiba Corp Coupling device and method of turbine vanes
FR2512014A1 (fr) * 1981-08-28 1983-03-04 Guerbet Sa Composes bromes utilisables dans des produits opacifiants
DE3413628C2 (de) * 1983-04-25 1996-09-19 Gen Electric Spaltdichtung für eine Dampfturbine
JPS6114260A (ja) * 1984-06-29 1986-01-22 Mitsubishi Petrochem Co Ltd 成形性を改良した樹脂組成物
RU2161257C2 (ru) * 1999-01-27 2000-12-27 Открытое акционерное общество "Авиадвигатель" Рабочая лопатка турбины газотурбинного двигателя

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US937006A (en) * 1906-03-03 1909-10-12 Allis Chalmers Steam-turbine.
US1618285A (en) * 1927-02-22 Blade lashing
CH272378A (de) * 1949-02-17 1950-12-15 Escher Wyss Ag Beschaufelung an Rotoren von axial durchströmten, verwundene Schaufeln aufweisenden Kreiselmaschinen, insbesondere von Dampf-, Gasturbinen und Verdichtern.
US3180616A (en) * 1961-04-20 1965-04-27 Carrier Corp Vibration damped turbo machinery
US3302925A (en) * 1966-01-17 1967-02-07 Gen Electric Diagonal cover piece for turbine bucket
US3417964A (en) * 1967-11-20 1968-12-24 Westinghouse Electric Corp Shrouded blade arrangement
US3527546A (en) * 1969-01-02 1970-09-08 Gen Electric Tie pins for turbine buckets

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1618285A (en) * 1927-02-22 Blade lashing
US937006A (en) * 1906-03-03 1909-10-12 Allis Chalmers Steam-turbine.
CH272378A (de) * 1949-02-17 1950-12-15 Escher Wyss Ag Beschaufelung an Rotoren von axial durchströmten, verwundene Schaufeln aufweisenden Kreiselmaschinen, insbesondere von Dampf-, Gasturbinen und Verdichtern.
US3180616A (en) * 1961-04-20 1965-04-27 Carrier Corp Vibration damped turbo machinery
US3302925A (en) * 1966-01-17 1967-02-07 Gen Electric Diagonal cover piece for turbine bucket
US3417964A (en) * 1967-11-20 1968-12-24 Westinghouse Electric Corp Shrouded blade arrangement
US3527546A (en) * 1969-01-02 1970-09-08 Gen Electric Tie pins for turbine buckets

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643645A (en) * 1984-07-30 1987-02-17 General Electric Company Stage for a steam turbine
US6007296A (en) * 1997-03-08 1999-12-28 Abb Research Ltd. Guide blade for steam turbines
US20040191068A1 (en) * 2003-03-28 2004-09-30 Christoph Richter Moving-blade row for fluid-flow machines
US20100135775A1 (en) * 2008-12-01 2010-06-03 Alstom Technology Ltd Turbomachine, especially steam turbine
US8636475B2 (en) 2008-12-01 2014-01-28 Alstom Technology Ltd Turbomachine, especially steam turbine

Also Published As

Publication number Publication date
GB1367728A (en) 1974-09-25
DE2246134A1 (de) 1973-04-05
CH550935A (de) 1974-06-28
JPS4842209A (enrdf_load_stackoverflow) 1973-06-20
FR2155308A5 (enrdf_load_stackoverflow) 1973-05-18
DE2246134C3 (de) 1979-12-06
DE2246134B2 (de) 1979-04-19
JPS538010B2 (enrdf_load_stackoverflow) 1978-03-24
IT967756B (it) 1974-03-11

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