EP2165049A1 - Structure en nid-d'abeilles - Google Patents

Structure en nid-d'abeilles

Info

Publication number
EP2165049A1
EP2165049A1 EP08784243A EP08784243A EP2165049A1 EP 2165049 A1 EP2165049 A1 EP 2165049A1 EP 08784243 A EP08784243 A EP 08784243A EP 08784243 A EP08784243 A EP 08784243A EP 2165049 A1 EP2165049 A1 EP 2165049A1
Authority
EP
European Patent Office
Prior art keywords
honeycomb structure
holes
honeycomb
cell walls
structure according
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.)
Withdrawn
Application number
EP08784243A
Other languages
German (de)
English (en)
Inventor
Reinhold Meier
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 EP2165049A1 publication Critical patent/EP2165049A1/fr
Withdrawn legal-status Critical Current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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
    • F01D11/127—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part with a deformable or crushable structure, e.g. honeycomb
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/10—Two-dimensional
    • F05D2250/19—Two-dimensional machined; miscellaneous
    • F05D2250/191—Two-dimensional machined; miscellaneous perforated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/20—Three-dimensional
    • F05D2250/28—Three-dimensional patterned
    • F05D2250/283—Three-dimensional patterned honeycomb
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24149—Honeycomb-like

Definitions

  • a honeycomb structure for non-hermetic rotor-stator and rotor-rotor seals in turbomachinery comprising a plurality of honeycomb cells separated by cell walls and at least predominantly radially oriented with respect to a rotor axis.
  • the honeycomb cells rotate with their free edges at least one relative to the honeycomb structure Taper cutting cooperate, according to the preamble of claim 1.
  • honeycomb structures are generally designed with hexagonal honeycomb cells in cross-section and therefore also referred to as honeycombs.
  • the cooperating with these rotary sealing cutting edges are also referred to as sealing fins. It is required of the honeycomb structure that it can be run in by contact with a sealing cutting edge due to deformation and / or removal of material and in no way damages the seal cutting edge.
  • the material used for the cell walls of the honeycomb cells is usually sufficient temperature-resistant and oxidation or corrosion-resistant metal is used, preferably nickel-based. In order to ensure a sufficient shrinkability at the relatively high strength and hardness of this material, the wall thickness of the cell walls must be extremely thin. This limits above all the production possibilities for the honeycomb structure.
  • preformed sheet metal strips are the starting product, which are connected to one another and applied to a carrier by soldering.
  • the honeycomb structure thus formed must then be overscaled or ground to size, which in turn can lead to problems due to the small wall thicknesses.
  • sharp burrs can result, which can only be removed again with great effort.
  • the lifetime of the thin cell walls is u. a. limited by oxidation or corrosion attack. Erosion is also a problem in this context. Ultimately, cracks, holes and other damage patterns may result.
  • the object of the invention is to propose a honeycomb structure for non-hermetic rotor-stator and rotor-rotor seals in turbomachinery, which has a longer life with a similar running-in behavior and more possibilities for production granted.
  • the cell walls of the honeycomb cells are provided with holes according to a defined perforation pattern.
  • the cell walls of the honeycomb cells can be made thicker, more durable, dimensionally accurate and better to manufacture.
  • This enables or facilitates the use of new, less expensive, integral manufacturing processes, such as e.g. the MIM process (Metal Injection Molding).
  • MIM process Metal Injection Molding
  • the compliance of the honeycomb structure is substantially determined by the perforation pattern and hole geometry. In this way, bending points or predetermined breaking points can be arranged locally in a targeted manner. The additional expense of inserting the holes is compensated by a more cost effective method of making the honeycomb itself.
  • FIG. 1 is a perspective view of a perforated honeycomb structure with hexagonal honeycomb cells
  • Fig. 2 is a plan view of a hexagonal honeycomb cell in sheet metal construction and Fig. 3 is a plan view of a square honeycomb cell in sheet metal construction.
  • the integral honeycomb structure 1 according to FIG. 1 is particularly suitable for powder metallurgy production in so-called MIM construction.
  • the self-level cell walls 5 of the honeycomb cells 2 form hexagonal structures in the manner of honeycombs.
  • the cell walls 5 of the honeycomb cells 2 are provided with a defined perforation pattern.
  • the perforation pattern comprises holes 9, which are arranged near the free edges 6 of the cell walls 5, and holes 10, which are arranged at a greater distance from the free edges 6.
  • the holes 9 and the holes 10 are circular and have the same diameter, but the number of holes 10 is less than that of the holes 9.
  • the illustrated perforation pattern causes the cell walls 5 to become more compliant towards the free edges 6. It will be clear to a person skilled in the art that he has a large number of possible variations within the scope of the invention. So he can use elliptical or oval holes instead of round holes. Of course he can also combine different hole shapes and sizes. He can also increase or decrease the hole density at specific points. It will be useful to provide only holes where it is expected in normal operation with a tarnishing or shrinkage of the associated sealing edges. For producing the holes in the cell walls 5, various manufacturing methods are available, such as mechanical drilling or mechanical punching, electron beam or laser drilling, electrochemical drilling or spark erosion drilling.
  • the holes can be introduced before and / or after the sintering of the structure.
  • the goal will be to achieve the desired manufacturing accuracy in an economical way.
  • Fig. 2 illustrates how one can produce hexagonal honeycomb cells 3 with preformed sheet metal strips 7. In this case, the effect occurs that one part of the cell walls is single-layer, the other part is double-layered.
  • the invention here offers the possibility of using a different perforation pattern in the double-layered cell walls than in the single-layered cell walls. Ultimately, a comparable run-in behavior should be achieved for all wall types.
  • FIG. 3 shows the production of honeycomb cells 4 with a square cross section. In this case, bent at right angles, burgzinnenieri sheet metal strips 8 are connected to each other. In the case of square or rectangular honeycomb cells 4, it may be useful to provide only a perforation pattern for the cell walls that are transverse to the sealing edges or their direction of movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

L'invention concerne une structure en nid-d'abeilles dans des systèmes d'étanchéité non-hermétiques rotor-stator et rotor-rotor, comprenant une pluralité de cellules alvéolaires orientées au moins radialement de façon prédominante, séparées par des parois cellulaires, ouvertes d'un côté, qui coopèrent, par leurs bords libres, avec au moins une section tranchante d'étanchéité entraînée en rotation par rapport à la structure en nid-d'abeilles, et qui sont capables de se rétrécir, par rapport à la section tranchante, lors du contact, par déformation et/ou par enlèvement de matière. L'invention est caractérisée en ce que les parois des alvéoles en nid-d'abeilles sont perforées conformément à un modèle de perforation défini.
EP08784243A 2007-07-05 2008-06-21 Structure en nid-d'abeilles Withdrawn EP2165049A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007031404A DE102007031404A1 (de) 2007-07-05 2007-07-05 Wabenstruktur
PCT/DE2008/001041 WO2009003445A1 (fr) 2007-07-05 2008-06-21 Structure en nid-d'abeilles

Publications (1)

Publication Number Publication Date
EP2165049A1 true EP2165049A1 (fr) 2010-03-24

Family

ID=39916641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08784243A Withdrawn EP2165049A1 (fr) 2007-07-05 2008-06-21 Structure en nid-d'abeilles

Country Status (4)

Country Link
US (1) US8501297B2 (fr)
EP (1) EP2165049A1 (fr)
DE (1) DE102007031404A1 (fr)
WO (1) WO2009003445A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010062087A1 (de) * 2010-11-29 2012-05-31 Siemens Aktiengesellschaft Strömungsmaschine mit Dichtstruktur zwischen drehenden und ortsfesten Teilen sowie Verfahren zur Herstellung dieser Dichtstruktur
DE102014208801A1 (de) * 2014-05-09 2015-11-12 MTU Aero Engines AG Dichtung, Verfahren zur Herstellung einer Dichtung und Strömungsmaschine
JP6088029B2 (ja) * 2015-11-19 2017-03-01 三菱重工業株式会社 シール装置
US10486389B2 (en) * 2016-10-05 2019-11-26 Space Exploration Technologies Corp. Laser-perforated metal honeycomb material and method of manufacturing same
US11149853B2 (en) * 2018-05-15 2021-10-19 Dell Products L.P. Airflow sealing by flexible rubber with I-beam and honeycomb structure

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3529905A (en) * 1966-12-12 1970-09-22 Gen Motors Corp Cellular metal and seal
DE19821365C2 (de) * 1998-05-13 2001-09-13 Man Turbomasch Ag Ghh Borsig Kühlung einer Wabendichtung im mit Heißgas beaufschlagten Teil einer Gasturbine
US7105219B2 (en) * 2004-05-27 2006-09-12 Mitsubishi Heavy Industries, Ltd. Brazing construction and method of brazing an abradable sealing material
DE102005002270A1 (de) * 2005-01-18 2006-07-20 Mtu Aero Engines Gmbh Triebwerk

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2009003445A1 *

Also Published As

Publication number Publication date
US8501297B2 (en) 2013-08-06
US20100283211A1 (en) 2010-11-11
DE102007031404A1 (de) 2009-01-08
WO2009003445A1 (fr) 2009-01-08

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