EP1402151A1 - Fixation d'aubes - Google Patents

Fixation d'aubes

Info

Publication number
EP1402151A1
EP1402151A1 EP02732401A EP02732401A EP1402151A1 EP 1402151 A1 EP1402151 A1 EP 1402151A1 EP 02732401 A EP02732401 A EP 02732401A EP 02732401 A EP02732401 A EP 02732401A EP 1402151 A1 EP1402151 A1 EP 1402151A1
Authority
EP
European Patent Office
Prior art keywords
blade
disc
rivet
extensions
disk
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.)
Granted
Application number
EP02732401A
Other languages
German (de)
English (en)
Other versions
EP1402151B1 (fr
Inventor
Gerhard BRÜCKNER
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.)
MTU Aero Engines AG
Original Assignee
MTU Aero Engines GmbH
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 MTU Aero Engines GmbH filed Critical MTU Aero Engines GmbH
Publication of EP1402151A1 publication Critical patent/EP1402151A1/fr
Application granted granted Critical
Publication of EP1402151B1 publication Critical patent/EP1402151B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/326—Locking of axial insertion type blades by other means

Definitions

  • the invention relates to a fastening of rotor blades to a disk of a turbomachine rotor, according to the preamble of patent claim 1.
  • toothed or corrugated feet often referred to as “fir tree feet”, in turbine rotor blades of gas turbines and to hold them in a form-fitting manner in axial disk grooves.
  • the contact surfaces of the foot and groove take up the radial centrifugal forces and flow and acceleration-induced circumferential forces and bending moments
  • the axial forces must be transmitted by additional elements, for this there are a number of possibilities, such as stop surfaces on one side of the blade feet and sheet metal, rings, wires, etc., which snap into grooves on the other side of the blade feet , whereby screw holes and threads in the highly loaded washers are very critical in terms of strength.
  • a disadvantage is that the disk grooves have to be deeper in relation to the blade root than without a rivet or that only a rivet with a relatively small cross-section can be accommodated.
  • Another serious disadvantage is that the axial forces in the area of the seat plates are introduced into the rivet heads, the entire rivet shaft being under tension. The notch effect at the shaft / head transitions creates an acute risk of breakage under tension. At least plastic deformations can occur, which increasingly loosen the connection.
  • the object of the present invention is to provide a blade attachment with rivet connection, which with moderate design effort and high ease of assembly and repair as well as small space requirements is significantly better in terms of strength and is therefore safer and more reliable.
  • each rivet is arranged in a radial plane with respect to the axis of rotation of the disk and thus transversely to the axial forces that occur. This means that only the rivet shaft is subjected to shear, the rivet heads are largely load-free. If at all, tensile stresses only occur in unproblematic size, since they only result from acceleration forces and centrifugal forces from the low rivet mass. Rivets with a relatively large shaft diameter, i.e. large thickness are used with the advantage of low surface pressure and low shear stresses in the shaft.
  • the "bore halves" in the blade root and disc extensions enclose the rivet shafts as far as possible and ensure a favorable introduction of force.
  • Figure 1 is a partial spatial view of the attachment area of three blades on a disc
  • Figure 2 is a partial view of the area of the rivet attachment in the longitudinal direction of the rivet.
  • FIG. 1 is a copy of a spatial computer graphic, which represents the attachment according to the invention using three blades 1 on a disk 6 as an example. Of the blades 1, only the platform close to the disk, ie the inner annular space boundary, and the blade root 2 can be seen. The respective airfoil is above the illustration.
  • Each blade root 2 has a cross-section similar to a fir tree with two mirror-symmetrical projections 3, 4 on each side and is held in a form-fitting manner by a disk groove 7.
  • the disk grooves 7 generally run axially, but they can also be rotated by a defined rotation around an imaginary radial axis, for example the threading axis of the felprofile, at a small angle to the axial direction. However, this is irrelevant to the principle of the invention.
  • the blade roots 2 and the disk 6 have axial extensions 5, 8, which are opposed in pairs.
  • a common bore 9 is formed in a pair of extensions 5, 8, into which a rivet 10 is inserted and fixed by plastic deformation.
  • FIG 1 as an example rivets 10 with Senkk 'opf 1 1 shown in yet undeformed state.
  • the axes X of the bores 9 and thus of the rivets 10 lie tangentially on an imaginary circle, not shown, which is concentric with the axis of rotation of the disk 6.
  • the smallest distance A in the circumferential direction between the extensions 8 at adjacent blade positions is greater than the length L of an undeformed rivet 10 in order to be able to mount and rivet the latter.
  • the space requirement of the riveting tool must also be taken into account.
  • the extensions might also have to be adjusted in their position.
  • Angled to radial arrangements can bring advantages in terms of assembly technology, however centrifugal force components in the longitudinal direction of the rivet and lateral forces also act on the blade bucket feet.
  • centrifugal force components in the longitudinal direction of the rivet and lateral forces also act on the blade bucket feet.
  • the axis orientation relative to the local tangential or radial direction should be the same for each rivet on the disk circumference.
  • FIG. 2 shows a partial view in the direction of the axis X of the bore 9 and thus of the rivet 10.
  • the radial plane R which is transverse to the axis of rotation of the disk 6 and in which the axes X of all the bores 9 and rivets are vertical, is indicated by dash-dotted lines 10 should lie, here as in Figure 1 with tangential orientation. It can be seen that the axial extension 5 of the blade root 2 and the axial extension 8 of the disk 6 are at a small radial distance from one another. It can also be seen that the bore 9 is approximately half-molded into both extensions 5 and 8, the rivet 10 being largely enclosed. The countersunk head 1 1 of the rivet 10 is indicated here by dash-dotted lines.
  • rivets with different head shapes can be used. It should be taken into account that the rivets must be removable / replaceable without damaging the blades and washer. lowering Head-like rivet ends are probably easier to grip and separate than heads with large, flat contact surfaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Connection Of Plates (AREA)

Abstract

La présente invention concerne la fixation d'aubes sur le disque d'un rotor de turbomachine doté d'emplantures d'aubes qui ont une section présentant une symétrie par rapport à un miroir, comprenant des parties en saillie, des gorges de disque axiales venant en prise avec les emplantures d'aubes par liaison de forme, ainsi qu'un assemblage riveté par aube, destiné à la fixation axiale des aubes. Selon l'invention: chaque emplanture d'aube et le disque au niveau de chaque emplanture d'aube présentent des prolongements axiaux; les prolongements axiaux des aubes et du disque sont opposés par paires; un orifice respectif disposé dans un plan radial par rapport à l'axe du disque, est pratiqué à moitié dans le prolongement axial de l'aube et à moitié dans le prolongement axial du disque; et dans chaque orifice est mis en place un rivet qui est fixé par déformation plastique.
EP02732401A 2001-06-14 2002-04-25 Fixation d'aubes Expired - Lifetime EP1402151B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10128505 2001-06-14
DE10128505A DE10128505C2 (de) 2001-06-14 2001-06-14 Befestigung von Laufschaufeln
PCT/DE2002/001509 WO2002103166A1 (fr) 2001-06-14 2002-04-25 Fixation d'aubes

Publications (2)

Publication Number Publication Date
EP1402151A1 true EP1402151A1 (fr) 2004-03-31
EP1402151B1 EP1402151B1 (fr) 2006-06-21

Family

ID=7688045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02732401A Expired - Lifetime EP1402151B1 (fr) 2001-06-14 2002-04-25 Fixation d'aubes

Country Status (4)

Country Link
US (1) US7090468B2 (fr)
EP (1) EP1402151B1 (fr)
DE (2) DE10128505C2 (fr)
WO (1) WO2002103166A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2939834B1 (fr) * 2008-12-17 2016-02-19 Turbomeca Roue de turbine avec systeme de retention axiale des aubes
US8905717B2 (en) 2010-10-06 2014-12-09 General Electric Company Turbine bucket lockwire rotation prevention
US9112383B2 (en) 2011-10-31 2015-08-18 General Electric Company System and method for Var injection at a distributed power generation source
CN109098777A (zh) * 2018-09-05 2018-12-28 中国航发动力股份有限公司 一种烟气轮机盘片槽向连接结构及其使用方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6014162B2 (ja) * 1978-07-21 1985-04-11 株式会社日立製作所 翼固定構造
US4389161A (en) 1980-12-19 1983-06-21 United Technologies Corporation Locking of rotor blades on a rotor disk
US4444544A (en) * 1980-12-19 1984-04-24 United Technologies Corporation Locking of rotor blades on a rotor disk
US5302086A (en) * 1992-08-18 1994-04-12 General Electric Company Apparatus for retaining rotor blades
FR2700807B1 (fr) * 1993-01-27 1995-03-03 Snecma Système de rétention et d'étanchéité d'aubes engagées dans des brochages axiaux d'un disque de rotor.
DE19516694C2 (de) * 1995-05-06 2001-06-28 Mtu Aero Engines Gmbh Einrichtung zur Fixierung von Laufschaufeln am Laufrad, insbesondere einer Turbine eines Gasturbinentriebwerks

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02103166A1 *

Also Published As

Publication number Publication date
US7090468B2 (en) 2006-08-15
WO2002103166A1 (fr) 2002-12-27
DE10128505C2 (de) 2003-04-30
EP1402151B1 (fr) 2006-06-21
US20040184917A1 (en) 2004-09-23
DE10128505A1 (de) 2003-01-02
DE50207310D1 (de) 2006-08-03

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