US3055634A - Steam turbines - Google Patents

Steam turbines Download PDF

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Publication number
US3055634A
US3055634A US74020A US7402060A US3055634A US 3055634 A US3055634 A US 3055634A US 74020 A US74020 A US 74020A US 7402060 A US7402060 A US 7402060A US 3055634 A US3055634 A US 3055634A
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US
United States
Prior art keywords
blades
coverband
blade
shaft
turbine
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
US74020A
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English (en)
Inventor
Mitchell John Mackenzie
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 Company PLC
Original Assignee
General Electric Company PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Company PLC filed Critical General Electric Company PLC
Application granted granted Critical
Publication of US3055634A publication Critical patent/US3055634A/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
    • F01D5/24—Blade-to-blade connections, e.g. for damping vibrations using wire or the like
    • 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 steam turbines of the axial flow type and is more particularly concerned with the low pressure stages of the turbines.
  • a turbine wheel for a steam turbine of the axial flow type comprises a shaft, a plurality of blades radiating from said shaft, a coverband secured to the free ends of the blades and of unitary form between each pair of said blades, and blade tips extending outwardly from said coverband, said blade tips being integral with and supported solely by said coverband.
  • the members forming the coverband may comprise a plurality of arched-beam like members and each end of said member may provide half a blade tip. Mating half blade tips may be secured together by common rivets, and common rivets may be used to secure the members to the blades.
  • the tips of the blades may be made of a harder material than the body of the blades, and the tips may derive their rigidity from the members forming the coverband.
  • FIG- URE 1 shows a plan view of part of the turbine wheel including two of the blades
  • FIGURE 2 shows a side view of the blades shown in FIGURE I viewed in the direction of the arrow II
  • FIGURE 3 is a side view of one blade taken on the line IIIIII in FIGURE 1
  • FIGURE 4 shows in part section the last two stages of a large turbine in which the turbine wheel of the fixed stage as replaceable tips.
  • the turbine wheel comprises a plurality of identical blades projecting radially from a common hub and being joined at their free ends by arched coverband members. Since all the blades are identical only two are shown in the drawings as 1 and 2 and these are joined at their free ends by a coverband member comprising an arch 3 having two small inwardly projecting flanks 4, 5 one at each end of the arch 3 and two outwardly projecting flanks 6, 7.
  • the blades 1, 2 have on their other sides similar coverband members comprising arches 8, 9 having inwardly projecting flanks 10, 11 and outwardly projecting flanks 12, 13 respectively, the arches 8, 9 connecting the blades 1, 2 to the adjacent blades not shown.
  • flanks 5 and 11 of the arches 3 and 9 abut over the end of the blade 2 and around the end of the blade.
  • a hammer-head and socket joint is formed by an enlarged portion 14 at the end of the blade 2 which locates in a recess 15 formed by the mating of the two flanks 5 and 11. Rivets pass through holes in the flanks 5, 11 and the blade 2 to hold the coverband securely to the blade.
  • the blade 1 is secured to the flanks 4 and 10 in a similar manner.
  • the outwardly projecting flanks 6, 12 and 7, 13 abut respectively to form the tips of the blades 1 and 2, and these tips are shaped so that they present the correct profile to the steam issuing from the previous set of fixed blades. Holes are provided in these outwardly projecting [flanks and rivets 17 pass through these holes to secure the abutting pairs of flanks together.
  • the turbine has a rotor 18 to which are attached the blades of the final turbine wheel 19 and the penultimate turbine wheel 20. Attached to the housing 21 of the turbine are the diaphragrns carrying the fixed turbine blades 22, 23 and these diaphragms are provided with seals 24 at their point of contact with the rotor 18.
  • blade tips when the tips eventually become eroded they can be replaced by replacing the coverband around the periphery of the wheel.
  • the blade tips need not necessarily be formed as two halves but could be formed singly if so desired.
  • connection between the blade and the tip is both highly resistant to radial pull and at the same time is flexurally stiff, without being too massive. Further stilfening of the tip is obtained at high speeds from the forces exerted by the arches themselves, the action of these arches is more fully described in British patent specification No. 770,528.
  • a turbine wheel for a steam turbine of the axial flow type comprising: a shaft, a plurality of blades radiating from said shaft, a coverband secured to the free ends of the blades and of unitary form between each pair of said blades, and blade tips extending outwardly from said coverband, said blade tips being integral with and supported solely by said coverband.
  • a turbine wheel for a steam turbine of the axial flow type comprising: a shaft, a plurality of blades radiating from said shaft, a coverband secured to the free ends of the blades and including a plurality of unitary members arched radially with respect to said shaft and each extending between a pair of adjacent blades, and blade tips formed integrally with and supported solely by said unitary members and extending outwardly fro-m said coverband.
  • a turbine wheel for a steam turbine of the axial flow type comprising: a shaft, a plurality of blades radiating from said shaft, a eomeric secured to the free ends of the blades and including a plurality of unitary members radially arched with respect to said shaft and each extending between a pair of adjacent blades, and blade tips, each consisting of abutting integral extensions of the ends of two adjacent ones of said unitary members, said blade tips extending outwardly from and being solely supported by said coverband.
  • a turbine wheel for a steam turbine of the axial flow type comprising: a shaft, a plurality of blades radiating from said shaft, a coverband secured to the free ends of the blades and including a plurality of unitary members radially arched with respect to said shaft and each extending between a pair of adjacent blades, and blade tips, each consisting of an integral extension of one of said unitary members at one of its ends, said 4 blade tips extending outwardly from and being solely supported by said coverband.
  • a turbine wheel for a steam turbine of the axial flow type comprising: a shaft, a plurality of blades radiating from said shaft, a coverband secured to the free end of each blade by a riveted hammerhead and socket joint, said coverband including a plurality of unitary members radially arched with respect to said shaft and each extending between a pair of adjacent blades, and
  • blade tips each consisting of abutting integral extensions of the ends of two adjacent ones of said unitary members, said blade tips extending outwardly from and being solely supported by said coverband.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US74020A 1959-12-07 1960-12-06 Steam turbines Expired - Lifetime US3055634A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB41486/59A GB910239A (en) 1959-12-07 1959-12-07 Improvements in or relating to steam turbines

Publications (1)

Publication Number Publication Date
US3055634A true US3055634A (en) 1962-09-25

Family

ID=10419913

Family Applications (1)

Application Number Title Priority Date Filing Date
US74020A Expired - Lifetime US3055634A (en) 1959-12-07 1960-12-06 Steam turbines

Country Status (3)

Country Link
US (1) US3055634A (de)
CH (1) CH389645A (de)
GB (1) GB910239A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708244A (en) * 1970-04-13 1973-01-02 Rolls Royce Bladed rotor for a gas turbine engine
US4734010A (en) * 1985-05-31 1988-03-29 Bbc Brown, Boveri & Company, Limited Damping element for independent turbomachine blades
US20080063522A1 (en) * 2006-09-07 2008-03-13 Rolls-Royce Plc Array of components
US20110142650A1 (en) * 2009-12-14 2011-06-16 Beeck Alexander R Turbine Blade Damping Device with Controlled Loading
US20110142654A1 (en) * 2009-12-14 2011-06-16 Marra John J Turbine Blade Damping Device With Controlled Loading
US20120027616A1 (en) * 2010-08-02 2012-02-02 Merrill Gary B Gas turbine blade with intra-span snubber and manufacturing method for producing the same
USRE45690E1 (en) 2009-12-14 2015-09-29 Siemens Energy, Inc. Turbine blade damping device with controlled loading

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2281356B (en) * 1993-08-20 1997-01-29 Rolls Royce Plc Gas turbine engine turbine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB309181A (en) * 1928-04-06 1929-12-12 Rateau Soc Improvements in or relating to rotors for high-capacity turbines
GB576218A (en) * 1941-09-11 1946-03-25 Fritz Albert Max Heppner Built-up sheet-metal compressor or like blades
GB702740A (en) * 1949-08-10 1954-01-20 Power Jets Res & Dev Ltd Improvements in or relating to bladed rotors for axial flow turbines and similarly bladed fluid flow machines
US2801789A (en) * 1954-11-30 1957-08-06 Power Jets Res & Dev Ltd Blading for gas turbine engines
US2914299A (en) * 1954-02-05 1959-11-24 Gen Electric Co Ltd Steam turbines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB309181A (en) * 1928-04-06 1929-12-12 Rateau Soc Improvements in or relating to rotors for high-capacity turbines
GB576218A (en) * 1941-09-11 1946-03-25 Fritz Albert Max Heppner Built-up sheet-metal compressor or like blades
GB702740A (en) * 1949-08-10 1954-01-20 Power Jets Res & Dev Ltd Improvements in or relating to bladed rotors for axial flow turbines and similarly bladed fluid flow machines
US2914299A (en) * 1954-02-05 1959-11-24 Gen Electric Co Ltd Steam turbines
US2801789A (en) * 1954-11-30 1957-08-06 Power Jets Res & Dev Ltd Blading for gas turbine engines

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708244A (en) * 1970-04-13 1973-01-02 Rolls Royce Bladed rotor for a gas turbine engine
US4734010A (en) * 1985-05-31 1988-03-29 Bbc Brown, Boveri & Company, Limited Damping element for independent turbomachine blades
US20080063522A1 (en) * 2006-09-07 2008-03-13 Rolls-Royce Plc Array of components
US20110142650A1 (en) * 2009-12-14 2011-06-16 Beeck Alexander R Turbine Blade Damping Device with Controlled Loading
US20110142654A1 (en) * 2009-12-14 2011-06-16 Marra John J Turbine Blade Damping Device With Controlled Loading
US8540488B2 (en) 2009-12-14 2013-09-24 Siemens Energy, Inc. Turbine blade damping device with controlled loading
US8616848B2 (en) 2009-12-14 2013-12-31 Siemens Energy, Inc. Turbine blade damping device with controlled loading
USRE45690E1 (en) 2009-12-14 2015-09-29 Siemens Energy, Inc. Turbine blade damping device with controlled loading
US20120027616A1 (en) * 2010-08-02 2012-02-02 Merrill Gary B Gas turbine blade with intra-span snubber and manufacturing method for producing the same
US8790082B2 (en) * 2010-08-02 2014-07-29 Siemens Energy, Inc. Gas turbine blade with intra-span snubber

Also Published As

Publication number Publication date
GB910239A (en) 1962-11-14
CH389645A (de) 1965-03-31

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