US20010028848A1 - Turbine rotor disk fitted with blades having christmastree-shaped roots, and a method of mounting a blade on a disk - Google Patents

Turbine rotor disk fitted with blades having christmastree-shaped roots, and a method of mounting a blade on a disk Download PDF

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Publication number
US20010028848A1
US20010028848A1 US09/774,605 US77460501A US2001028848A1 US 20010028848 A1 US20010028848 A1 US 20010028848A1 US 77460501 A US77460501 A US 77460501A US 2001028848 A1 US2001028848 A1 US 2001028848A1
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Prior art keywords
blade
disk
root
slot
stick
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US6447253B2 (en
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Robert Tempere
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General Electric Technology GmbH
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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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/323—Locking of axial insertion type blades by means of a key or the like parallel to the axis of the rotor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/22—Fuels; Explosives
    • G01N33/225—Gaseous fuels, e.g. natural gas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making
    • Y10T29/49321—Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member

Definitions

  • the present invention relates to a turbine rotor disk fitted with blades having Christmastree-shaped roots.
  • the invention relates to means enabling blades having Christmastree-shaped roots to be properly secured to the disk on which they are mounted, even at slow speeds of rotation.
  • Each spring is constituted by a single curved strip placed in a setback: the ends of the strip are in the setback and the curved portion is directed outwardly, i.e. against the bottom of the corresponding slot in the rotor disk.
  • the depth of the setback is smaller than the deflection in the middle of the curved spring.
  • An object of the present invention is to provide a turbine rotor disk fitted with blades having Christmastree-shaped roots, where the teeth of the blade roots are pressed against the complementary grooves formed in the slots of the disk by springs while avoiding the above-mentioned drawbacks of the prior art during assembly.
  • the invention thus provides a turbine rotor disk fitted with blades having Christmastree-shaped roots, said disk having complementary slots each receiving the root of a blade, wherein at least one stick having a setback holding a spring strip captive is placed in the bottom of each slot of the disk between said bottom and the end face of the root of the corresponding blade.
  • three of said sticks are disposed between the bottom of a slot in the disk and the end face of the root of the corresponding blade.
  • the end of the root of each blade has a rim against which one of said sticks comes into abutment.
  • the invention also provides a method of assembling a blade having a Christmastree-shaped root to a turbine rotor disk of the invention, the method comprising the following sequence of operations:
  • FIG. 1 is a fragmentary view of a steam turbine rotor disk of the invention seen looking along arrow I of FIG. 2;
  • FIG. 2 is a section view on II-II of FIG. 1;
  • FIG. 3 is an enlargement of fragment III of FIG. 2;
  • FIGS. 4 and 5 are respectively a plan view and a section view on V-V of FIG. 4 showing a stick used for mounting a blade on the rotor disk;
  • FIG. 6 is a fragmentary diagrammatic view of a turbine rotor in which there can be seen a disk with a blade in position to be assembled;
  • FIG. 7 shows a fragment of the disk with a slot in the low position
  • FIG. 8 is a view looking along arrow VIII of FIG. 7;
  • FIG. 9 shows a blade in position to be assembled in the rotor disk slot shown in FIGS. 7 and 8;
  • FIG. 10 shows the FIG. 9 blade seen along arrow X;
  • FIGS. 11 and 12 are similar to FIGS. 7 and 8 but after a blade has been installed;
  • FIG. 13 is an enlargement of a detail XIII of FIG. 11;
  • FIG. 14 is an enlargement of a detail XIV of FIG. 11.
  • FIG. 15 shows a tool used for inserting sticks in their locations.
  • FIGS. 1 to 3 With reference to FIGS. 1 to 3 , there can be seen a small part of a steam turbine rotor disk 1 having a blade 2 mounted thereon.
  • the blade has a root which is said to be “Christmastree-shaped”. This is the base 3 of the blade whose general shape when seen in section perpendicular to the axis Y of the rotor disk resembles a Christmas tree. This Christmastree-shaped root 3 serves to secure the blade 2 relative to the disk 1 .
  • the root 3 is inserted in a corresponding slot 4 of the disk 1 .
  • a stick 5 is placed between the bottom of the slot 4 and the end of the root 3 of the blade 2 .
  • three of these sticks are inserted one after another: they are referenced in FIG. 1.
  • Each stick is fitted with a spring strip (not shown in FIGS. 1 to 3 ), but visible in the stick shown on its own in FIGS. 4 and 5.
  • the stick 5 has a setback 6 in which a spring strip 7 is placed and held captive.
  • FIGS. 11 and 12 the blade 2 can be seen mounted on the disk 1 .
  • FIG. 11 corresponds to FIG. 1 after the disk has turned so as to place the blade 2 pointing downwards
  • FIG. 12 is a view seen along arrow XII of FIG. 11.
  • Detail XIV of FIG. 11, shown on a larger scale in FIG. 14, shows the other face of the disk 1 where the series of blades 2 , all mounted in the same manner as explained above, is closed laterally in conventional manner by a two-part ring 9 A, 9 B made up of a plurality of segments that are subsequently bonded together.
  • the empty space between the end of the root 3 and the bottom of the slot 4 in the disk 1 is of height H.
  • FIG. 5 which shows the stick 5 in isolation together with its spring strip 7 (which spring is merely a curved spring strip)
  • the total height of the stick plus its spring at rest is equal to G and naturally, the height G is greater than H so that the spring can perform its function of pressing the roots of the blades against the grooves in the slots of the disk.
  • FIGS. 6 to 10 show how a blade 2 is mounted on the rotor disk 1 .
  • the turbine and its disk 1 is placed so that its axis Y is horizontal and the root 3 of the blade 2 for mounting is inserted freely into the slot 4 situated in the bottom-most position. This is also shown in FIGS. 7 and 9.
  • the blade is mounted in the disk via its steam outlet face, given that steam travels in the direction shown by arrow F.
  • FIGS. 8 and 10 are views looking along arrows VIII and X of FIGS. 7 and 9 and show how the profiles of the slot 4 and of the Christmastree-shaped root 3 are curved.
  • the first stick 5 is inserted in the empty space between the end of the blade root 3 and the bottom of the slot 4 using a tool 10 as shown in FIG. 15. It suffices to strike the rear end of the tool in the direction of arrow Fl with a mallet until the first stick comes to bear against the rim 8 on the blade root 3 (FIG. 13). The other two sticks are subsequently inserted in the same manner so as to come to bear against the preceding stick. Thereafter the disk is closed in conventional manner by means of the rings 9 A and 9 B (FIG. 14).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Toys (AREA)

Abstract

A turbine rotor disk fitted with blades having Christmastree-shaped roots, said disk having complementary slots each receiving the root of a blade, wherein at least one stick having a setback holding a spring strip captive is placed in the bottom of each slot of the disk between said bottom and the end face of the root of the corresponding blade. During assembly, the slot of the disk corresponding to the blade that is to be mounted is put in the bottom position and then the root of the blade to be mounted is slid into the slot, after which the sticks, each fitted with its own spring strip are inserted in succession into the empty space between the bottom of the slot and the end of the root of the blade.

Description

  • The present invention relates to a turbine rotor disk fitted with blades having Christmastree-shaped roots. [0001]
  • More particularly, the invention relates to means enabling blades having Christmastree-shaped roots to be properly secured to the disk on which they are mounted, even at slow speeds of rotation. [0002]
    • BACKGROUND OF THE INVENTION
  • With this method of fixing where the root of each blade is said to be “Christmastree-shaped” and is received in a complementary slot in the rotor disk on which the blades are mounted, it is necessary for rotation to be taking place at sufficient speed before centrifugal force ensures that no relative movement is possible. The teeth on the root of the blade do not bear properly against the corresponding grooves in a slot of the disk at low speeds, and a known remedy to this drawback is to provide a few setbacks, generally three setbacks, in the end face of the root to provide housings for receiving springs. [0003]
  • Each spring is constituted by a single curved strip placed in a setback: the ends of the strip are in the setback and the curved portion is directed outwardly, i.e. against the bottom of the corresponding slot in the rotor disk. Naturally, the depth of the setback is smaller than the deflection in the middle of the curved spring. [0004]
  • When the blades are mounted on the disk, the springs are placed in their setbacks and the Christmastree-shaped rotor of each blade is inserted into the corresponding slot of the disk, i.e. simultaneously with its three springs. This operation is very difficult and accidents often arise such as springs breaking or jamming. [0005]
    • OBJECTS AND SUMMARY OF THE INVENTION
  • An object of the present invention is to provide a turbine rotor disk fitted with blades having Christmastree-shaped roots, where the teeth of the blade roots are pressed against the complementary grooves formed in the slots of the disk by springs while avoiding the above-mentioned drawbacks of the prior art during assembly. [0006]
  • The invention thus provides a turbine rotor disk fitted with blades having Christmastree-shaped roots, said disk having complementary slots each receiving the root of a blade, wherein at least one stick having a setback holding a spring strip captive is placed in the bottom of each slot of the disk between said bottom and the end face of the root of the corresponding blade. [0007]
  • Advantageously, three of said sticks are disposed between the bottom of a slot in the disk and the end face of the root of the corresponding blade. [0008]
  • According to another characteristic, the end of the root of each blade has a rim against which one of said sticks comes into abutment. [0009]
  • The invention also provides a method of assembling a blade having a Christmastree-shaped root to a turbine rotor disk of the invention, the method comprising the following sequence of operations: [0010]
  • a) the rotor disk is placed so that its axis is in a horizontal position; [0011]
  • b) the slot of the disk in which the blade root is to be mounted is placed in the bottom position; [0012]
  • c) the blade is installed by slidably inserting the root of the blade in the slot of the disk; and [0013]
  • d) the stick(s) each fitted with a respective spring strip are then inserted into the empty space between the bottom of the slot in the disk and the end of the blade root until the first-inserted stick comes into abutment against said rim on the root of the blade. [0014]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • An embodiment of the invention is described below with reference to the accompanying drawings, in which: [0015]
  • FIG. 1 is a fragmentary view of a steam turbine rotor disk of the invention seen looking along arrow I of FIG. 2; [0016]
  • FIG. 2 is a section view on II-II of FIG. 1; [0017]
  • FIG. 3 is an enlargement of fragment III of FIG. 2; [0018]
  • FIGS. 4 and 5 are respectively a plan view and a section view on V-V of FIG. 4 showing a stick used for mounting a blade on the rotor disk; [0019]
  • FIG. 6 is a fragmentary diagrammatic view of a turbine rotor in which there can be seen a disk with a blade in position to be assembled; [0020]
  • FIG. 7 shows a fragment of the disk with a slot in the low position; [0021]
  • FIG. 8 is a view looking along arrow VIII of FIG. 7; [0022]
  • FIG. 9 shows a blade in position to be assembled in the rotor disk slot shown in FIGS. 7 and 8; [0023]
  • FIG. 10 shows the FIG. 9 blade seen along arrow X; [0024]
  • FIGS. 11 and 12 are similar to FIGS. 7 and 8 but after a blade has been installed; [0025]
  • FIG. 13 is an enlargement of a detail XIII of FIG. 11; [0026]
  • FIG. 14 is an enlargement of a detail XIV of FIG. 11; and [0027]
  • FIG. 15 shows a tool used for inserting sticks in their locations.[0028]
    • MORE DETAILED DESCRIPTION
  • With reference to FIGS. [0029] 1 to 3, there can be seen a small part of a steam turbine rotor disk 1 having a blade 2 mounted thereon.
  • The blade has a root which is said to be “Christmastree-shaped”. This is the [0030] base 3 of the blade whose general shape when seen in section perpendicular to the axis Y of the rotor disk resembles a Christmas tree. This Christmastree-shaped root 3 serves to secure the blade 2 relative to the disk 1. The root 3 is inserted in a corresponding slot 4 of the disk 1.
  • In the invention, and as can be seen in the detail III shown on a larger scale in FIG. 3, a [0031] stick 5 is placed between the bottom of the slot 4 and the end of the root 3 of the blade 2. In practice, three of these sticks are inserted one after another: they are referenced in FIG. 1.
  • Each stick is fitted with a spring strip (not shown in FIGS. [0032] 1 to 3), but visible in the stick shown on its own in FIGS. 4 and 5. As can be seen in these figures, the stick 5 has a setback 6 in which a spring strip 7 is placed and held captive.
  • In FIGS. 11 and 12, the [0033] blade 2 can be seen mounted on the disk 1. FIG. 11 corresponds to FIG. 1 after the disk has turned so as to place the blade 2 pointing downwards, and FIG. 12 is a view seen along arrow XII of FIG. 11.
  • The detail referenced XIII in FIG. 11 and shown on a larger scale in FIG. 13 shows that the end of the Christmastree-[0034] shaped root 3 of the blade 2 has a rim 8 against which the first stick 5 to be inserted comes into abutment.
  • Detail XIV of FIG. 11, shown on a larger scale in FIG. 14, shows the other face of the [0035] disk 1 where the series of blades 2, all mounted in the same manner as explained above, is closed laterally in conventional manner by a two- part ring 9A, 9B made up of a plurality of segments that are subsequently bonded together.
  • As can be seen in the detail shown in FIG. 3, the empty space between the end of the [0036] root 3 and the bottom of the slot 4 in the disk 1 is of height H.
  • In FIG. 5 which shows the [0037] stick 5 in isolation together with its spring strip 7 (which spring is merely a curved spring strip), the total height of the stick plus its spring at rest is equal to G and naturally, the height G is greater than H so that the spring can perform its function of pressing the roots of the blades against the grooves in the slots of the disk.
  • As shown in FIG. 5, the ends of the [0038] spring strip 7 are in the bottom of the setback 6 while the curved portion in the middle is pressed against the bottom of the slot 4 in the rotor disk 1 once the stick 5 has been inserted between the root of the blade and the bottom of the slot, with the plane face of the stick 5 then bearing against the end of the root 3 of the blade (see FIGS. 3, 13, and 14).
  • FIGS. [0039] 6 to 10 show how a blade 2 is mounted on the rotor disk 1.
  • As shown in FIG. 6, the turbine and its [0040] disk 1 is placed so that its axis Y is horizontal and the root 3 of the blade 2 for mounting is inserted freely into the slot 4 situated in the bottom-most position. This is also shown in FIGS. 7 and 9. The blade is mounted in the disk via its steam outlet face, given that steam travels in the direction shown by arrow F.
  • FIGS. 8 and 10 are views looking along arrows VIII and X of FIGS. 7 and 9 and show how the profiles of the [0041] slot 4 and of the Christmastree-shaped root 3 are curved.
  • Given the empty space H (FIG. 3) between the bottom of the [0042] slot 4 and the tip of the blade root 3, the root can slide freely in the slot 4 without any risk of the teeth of the Christmastree-shape jamming in the grooves of the slot, since the surface state of the teeth and of the grooves is carefully prepared.
  • Finally, the [0043] first stick 5 is inserted in the empty space between the end of the blade root 3 and the bottom of the slot 4 using a tool 10 as shown in FIG. 15. It suffices to strike the rear end of the tool in the direction of arrow Fl with a mallet until the first stick comes to bear against the rim 8 on the blade root 3 (FIG. 13). The other two sticks are subsequently inserted in the same manner so as to come to bear against the preceding stick. Thereafter the disk is closed in conventional manner by means of the rings 9A and 9B (FIG. 14).

Claims (6)

1. A turbine rotor disk fitted with blades having Christmastree-shaped roots, said disk having complementary slots each receiving the root of a blade, wherein at least one stick having a setback holding a spring strip captive is placed in the bottom of each slot of the disk between said bottom and the end face of the root of the corresponding blade.
2. A rotor disk according to
claim 1
, wherein three of said sticks are disposed between the bottom of a slot in the disk and the end face of the root of the corresponding blade.
3. A rotor disk according to
claim 1
, wherein the end of the root of each blade has a rim against which one of said sticks comes into abutment.
4. A rotor disk according to
claim 1
, wherein said spring strip in any one of said sticks is a curved strip with the ends of the strip bearing in said setback and with the curved central portion thereof bearing against the bottom of said slot of the rotor disk, the opposite face of the stick bearing against the end of the root of the blade.
5. A method of assembling a blade having a Christmastree-shaped root to a turbine rotor disk according to
claim 1
, the method comprising the following sequence of operations:
a) the rotor disk is placed so that its axis is in a horizontal position;
b) the slot of the disk in which the blade root is to be mounted is placed in the bottom position;
c) the blade is installed by slidably inserting the root of the blade in the slot of the disk; and
d) the stick(s) each fitted with a respective spring strip are then inserted into the empty space between the bottom of the slot in the disk and the end of the blade root until the first-inserted stick comes into abutment against said rim on the root of the blade.
6. An assembly method according to
claim 5
, wherein said sticks are inserted from the steam outlet side and the first stick to be inserted comes into abutment against said rim which is situated at the steam inlet side.
US09/774,605 2000-03-30 2001-02-01 Turbine rotor disk fitted with blades having christmastree-shaped roots, and a method of mounting a blade on a disk Expired - Lifetime US6447253B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0004078A FR2807096B1 (en) 2000-03-30 2000-03-30 ROTOR DISC OF TURBINE EQUIPPED WITH FINS ON FOOT AND TREE OF MOUNTING A FIN ON A DISC
FR0004078 2000-03-30

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US20010028848A1 true US20010028848A1 (en) 2001-10-11
US6447253B2 US6447253B2 (en) 2002-09-10

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EP (1) EP1138879B1 (en)
JP (1) JP4657482B2 (en)
AT (1) ATE307269T1 (en)
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DK (1) DK1138879T3 (en)
ES (1) ES2247028T3 (en)
FR (1) FR2807096B1 (en)

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CN100335749C (en) * 2002-05-24 2007-09-05 Abb涡轮系统有限公司 Axial securing means for impeller blades
EP1382800A2 (en) * 2002-07-20 2004-01-21 Rolls Royce Plc A fan blade assembly
EP1382800A3 (en) * 2002-07-20 2006-08-23 Rolls Royce Plc A fan blade assembly
US20140161617A1 (en) * 2011-08-03 2014-06-12 Snecma Bladed rotor wheel for a turbine engine
US9540093B2 (en) * 2011-08-03 2017-01-10 Snecma Bladed rotor wheel for a turbine engine
US20140199172A1 (en) * 2013-01-11 2014-07-17 General Electric Company Turbomachine and method of handling turbomachine components
US12018590B1 (en) 2023-04-04 2024-06-25 Ge Infrastructure Technology Llc Method for turbine blade and assembly with dovetail arrangement for enlarged rotor groove

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JP4657482B2 (en) 2011-03-23
JP2001295602A (en) 2001-10-26
ES2247028T3 (en) 2006-03-01
ATE307269T1 (en) 2005-11-15
EP1138879A1 (en) 2001-10-04
DE60114065D1 (en) 2005-11-24
FR2807096B1 (en) 2002-05-31
FR2807096A1 (en) 2001-10-05
US6447253B2 (en) 2002-09-10
EP1138879B1 (en) 2005-10-19
DE60114065T2 (en) 2006-04-20
DK1138879T3 (en) 2006-03-06

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