EP2165049A1 - Honeycomb structure - Google Patents

Honeycomb structure

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Withdrawn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)
French (fr)
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/en
Withdrawn legal-status Critical Current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

Disclosed is a honeycomb structure for non-hermetic rotor-stator and rotor-rotor seals in turbo machines. Said honeycomb structure comprises a plurality of at least predominantly radially oriented honeycomb cells which are separated by cell walls, are open on one side, cooperate with at least one sharp sealing edge that rotates relative to the honeycomb structure, and can yield relative to the sharp sealing edge by being deformed and/or material being removed therefrom when being touched. The walls of the honeycomb cells have holes according to a defined perforation pattern.

Description

Wabenstruktur honeycomb structure
Wabenstruktur für nicht-hermetische Rotor-Stator- und Rotor-Rotor-Dichtungen in Turbomaschinen, mit einer Vielzahl von durch Zellwände getrennten, bezüglich einer Rotorachse zumindest vorwiegend radial orientierten, einseitig offenen Wabenzellen, die mit ihren freien Kanten mit wenigstens einer relativ zur Wabenstruktur rotierenden Dichtschneide zusammenwirken, gemäß dem Oberbegriff des Patentanspruches 1.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.
Derartige Wabenstrukturen werden in der Regel mit im Querschnitt sechseckigen Wabenzellen ausgeführt und daher auch als Honeycombs bezeichnet. Die mit diesen zusammenwirkenden, rotierenden Dichtschneiden werden auch als auch Dichtfins bezeichnet. Von der Wabenstruktur wird gefordert, dass diese bei Berührung mit einer Dichtschneide durch Verformung und/oder Materialabtrag einlauffähig ist und die Dichtschneide keinesfalls beschädigt. Als Material für die Zellwände der Wabenzellen wird meist ausreichend temperaturbeständiges sowie oxidations- bzw. korrosionsbeständiges Metall verwendet, vorzugsweise auf Nickelbasis. Um bei der relativ hohen Festigkeit und Härte dieses Materials eine ausreichende Einlauffähigkeit sicherzustellen, müssen die Wanddicken der Zellwände extrem dünn gewählt werden. Dies schränkt vor allem die Fertigungsmöglichkeiten für die Wabenstruktur ein. In der Regel sind vorgeformte Blechstreifen das Ausgangsprodukt, welche miteinander verbunden und durch Löten auf einen Träger aufgebracht werden. Die so gebildete Wabenstruktur muss dann auf Maß überdreht bzw. überschliffen werden, was aufgrund der geringen Wanddicken wiederum zu Problemen führen kann. Neben Zellverformungen können sich scharfe Grate ergeben, welche nur mit großem Aufwand wieder zu entfernen sind. Die Lebensdauer der dünnen Zellwände ist u. a. durch Oxidations- bzw. Korrosionsangriff begrenzt. Auch Erosion ist in diesem Zusammenhang ein Problem. Letztlich können sich Risse, Löcher und weitere Schadensbilder ergeben.Such 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. As a rule, 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. In addition to cell deformations, 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.
Es ist auch bekannt, die Einlauffähigkeit einer Wabenstruktur dadurch zu verbessern, dass die Wabenzellen abweichend von der Radialrichtung in Rotationsrichtung, d.h. in Um- fangsrichtung, geneigt werden. Dies hat jedoch strömungstechnische Konsequenzen und fertigungstechnische Nachteile.It is also known to improve the shrinkability of a honeycomb structure in that the honeycomb cells deviate from the radial direction in the direction of rotation, ie in Um- direction, inclined. However, this has fluidic consequences and manufacturing disadvantages.
Demgegenüber besteht die Aufgabe der Erfindung darin, eine Wabenstruktur für nichthermetische Rotor-Stator- und Rotor-Rotor-Dichtungen in Turbomaschinen vorzuschlagen, welche bei vergleichbarem Einlaufverhalten eine höhere Lebensdauer besitzt und mehr Möglichkeiten zur Fertigung gewährt.In contrast, 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.
Diese Aufgabe wird durch die in Anspruch 1 gekennzeichneten Merkmale gelöst, in Verbindung mit den gattungsbildenden Merkmalen in dessen Oberbegriff. Erfindungsgemäß sind die Zellwände der Wabenzellen nach einem definierten Perforationsmuster mit Löchern versehen. Dadurch lassen sich die Zellwände der Wabenzellen dicker, haltbarer, maßgenauer und besser zu fertigend ausführen. Dies ermöglicht bzw. erleichtert die Anwendung neuer, kostengünstiger, integraler Fertigungsverfahren, wie z.B. des MIM- Verfahrens (Metal Injection Molding). Somit wird die Nachgiebigkeit der Wabenstruktur wesentlich durch das Perforationsmuster und die Lochgeometrie bestimmt. Auf diese Weise lassen sich Biegestellen bzw. Sollbruchstellen örtlich gezielt anordnen. Der Mehraufwand für das Einbringen der Löcher ist durch ein kostengünstigeres Verfahren zur Herstellung der Wabenstruktur selbst kompensierbar.This object is achieved by the features characterized in claim 1, in conjunction with the generic features in the preamble. According to the invention, the cell walls of the honeycomb cells are provided with holes according to a defined perforation pattern. As a result, 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). Thus, 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.
Bevorzugte Ausgestaltungen der Wabenstruktur gemäß Anspruch 1 sind in den Unteransprüchen gekennzeichnet.Preferred embodiments of the honeycomb structure according to claim 1 are characterized in the subclaims.
Die Erfindung wird anschließend anhand der Zeichnungen noch näher erläutert. Dabei zeigen in vereinfachter, nicht maßstäblicher Darstellung:The invention will be explained in more detail with reference to the drawings. In a simplified, not to scale representation:
Fig. 1 eine perspektivische Ansicht einer perforierten Wabenstruktur mit sechseckigen Wabenzellen,1 is a perspective view of a perforated honeycomb structure with hexagonal honeycomb cells,
Fig. 2 eine Draufsicht auf eine sechseckige Wabenzelle in Blechbauweise und Fig. 3 eine Draufsicht auf eine quadratische Wabenzelle in Blechbauweise.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.
Die integrale Wabenstruktur 1 gemäß Fig. 1 eignet sich besonders für eine pulvermetallurgische Herstellung in so genannter MIM-Bauweise. Die in sich ebenen Zellwände 5 der Wabenzellen 2 bilden sechseckige Strukturen nach Art von Bienenwaben. Zu ihren freien Kanten 6 hin sind die Zellwände 5 der Wabenzellen 2 mit einem definierten Perforationsmuster versehen. Das Perforationsmuster umfasst Löcher 9, welche nahe bei den freien Kanten 6 der Zell wände 5 angeordnet sind, sowie Löcher 10, welche in größerem Abstand zu den freien Kanten 6 angeordnet sind. Die für die Löcher 9 und für die Löcher 10 jeweils konstanten Abstände der Lochmitten von den freien Kanten 6 sind mit Al und A2 bezeichnet. Im dargestellten Beispiel sind die Löcher 9 und die Löcher 10 kreisrund und besitzen denselben Durchmesser, allerdings ist die Anzahl der Löcher 10 geringer als diejenige der Löcher 9. Dies wird durch eine unterschiedliche Lochteilung erreicht. De facto bewirkt das dargestellte Perforationsmuster, dass die Zellwände 5 zu den freien Kanten 6 hin nachgiebiger werden. Für den Fachmann ist klar, dass er im Rahmen der Erfindung eine große Anzahl von Variationsmöglichkeiten hat. So kann er anstelle von runden Löchern elliptische bzw. ovale Löcher verwenden. Natürlich kann er auch verschiedene Lochformen und Größen kombinieren. Er kann auch die Lochdichte an bestimmten Stellen gezielt erhöhen oder absenken. Es wird sinnvoll sein, nur dort Löcher vorzusehen, wo im Normalbetrieb mit einem Anstreifen bzw. Einlaufen der zugehörigen Dichtschneiden zu rechnen ist. Für das Erzeugen der Löcher in den Zellwänden 5 bieten sich verschiedene Fertigungsverfahren an, wie z.B. mechanisches Bohren bzw. mechanisches Stanzen, Elektronenstrahl- oder Laserbohren, elektrochemisches Bohren oder funkenerosives Bohren. Bei der erwähnten MIM- Bauweise können die Löcher vor und/oder nach dem Sintern der Struktur eingebracht werden. Bei der ebenfalls möglichen Blechbauweise kann es sinnvoll sein, die Löcher in die Blechstreifen einzustanzen, bevor die Blechstreifen zur Wabenstruktur verbunden werden. In jedem Fall wird es das Ziel sein, die gewünschte Fertigungsgenauigkeit auf wirtschaftlichem Wege zu erreichen. Fig. 2 stellt dar, wie man sechseckige Wabenzellen 3 mit vorgeformten Blechstreifen 7 erzeugen kann. Dabei tritt der Effekt auf, dass ein Teil der Zellwände einlagig, der andere Teil doppellagig ausgeführt ist. Die Erfindung bietet hier die Möglichkeit, bei den doppel- lagigen Zellwänden ein anderes Perforationsmuster zu verwenden, als bei den einlagigen Zellwänden. Letztlich soll bei allen Wandtypen ein vergleichbares Einlaufverhalten erzielt werden.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. Towards their free edges 6, 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. For the holes 9 and for the holes 10 respectively constant distances of the hole centers of the free edges 6 are denoted by Al and A2. In the example shown, 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. This is achieved by a different hole pitch. In fact, 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. In the mentioned MIM construction, the holes can be introduced before and / or after the sintering of the structure. In the also possible sheet metal construction, it may be useful to punch the holes in the metal strip before the metal strips are connected to the honeycomb structure. In any case, 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 zeigt alternativ zu Fig. 2 die Herstellung von Wabenzellen 4 mit quadratischem Querschnitt. Dabei werden rechtwinklig gebogene, burgzinnenartige Blechstreifen 8 miteinander verbunden. Bei quadratischen oder rechteckigen Wabenzellen 4 kann es sinnvoll sein, nur die quer zu den Dichtschneiden bzw. deren Bewegungsrichtung stehenden Zellwände mit einem Perforationsmuster zu versehen.As an alternative to FIG. 2, FIG. 3 shows the production of honeycomb cells 4 with a square cross section. In this case, bent at right angles, burgzinnenartige 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.
All dies ist für den Fachmann leicht verständlich und daher nicht gesondert dargestellt. All this is easily understood by the skilled person and therefore not shown separately.

Claims

Patentansprüche claims
1. Wabenstruktur für nicht-hermetische Rotor-Stator- und Rotor-Rotor-Dichtungen in Turbomaschinen, insbesondere in Gasturbinen, mit einer Vielzahl von durch Zellwände getrennten, bezüglich einer Rotorachse zumindest vorwiegend radial orientierten, einseitig offenen Wabenzellen, die mit ihren freien Kanten mit wenigstens einer relativ zur Wabenstruktur rotierenden Dichtschneide zusammenwirken und gegenüber dieser bei Berührung durch Verformung und/oder Materialabtrag einlauffähig sind, dadurch gekennzeichnet, dass die Zellwände (5) der Wabenzellen (2) nach einem definierten Perforationsmuster mit Löchern (9, 10) versehen sind.1. honeycomb structure for non-hermetic rotor-stator and rotor-rotor seals in turbomachinery, in particular in gas turbines, with a plurality of cell walls separated by a rotor axis at least predominantly radially oriented, unilaterally open honeycomb cells with their free edges with at least one sealing blade rotating relative to the honeycomb structure are able to run together and are capable of running in contact with them due to deformation and / or material removal, characterized in that the cell walls (5) of the honeycomb cells (2) are provided with holes (9, 10) according to a defined perforation pattern.
2. Wabenstruktur nach Anspruch 1, dadurch gekennzeichnet, dass die Zellwände (5) der Wabenzellen (2) nur in einem Bereich mit Löchern (9, 10) versehen sind, in dem unter Berücksichtigung der im Normalbetrieb möglichen Relativbewegungen ein Einlaufen der wenigstens einen Dichtschneide zu erwarten ist.2. honeycomb structure according to claim 1, characterized in that the cell walls (5) of the honeycomb cells (2) are provided only in a region with holes (9, 10) in which, taking into account the relative movements possible in normal operation, a shrinkage of at least one sealing edge is to be expected.
3. Wabenstruktur nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Löcher (9, 10) in einer Reihe oder in mehreren, radial versetzten Reihen angeordnet sind, wobei die Löcher (9, 10) der oder jeder Reihe einen definierten, zumindest annähernd konstanten radialen Abstand (Al, A2) zu den zugehörigen freien Kanten (6) der Zell wände (5) aufweisen.3. honeycomb structure according to claim 1 or 2, characterized in that the holes (9, 10) in a row or in a plurality, radially offset rows are arranged, wherein the holes (9, 10) of the or each row one defined, at least approximately have constant radial distance (Al, A2) to the associated free edges (6) of the cell walls (5).
4. Wabenstruktur nach Anspruch 3, mit mehreren, radial versetzten Reihen von Löchern (9, 10), dadurch gekennzeichnet, dass die Anzahl der Löcher (9, 10) innerhalb einer Reihe von Reihe zu Reihe mit zunehmendem radialem Abstand (Al, A2) von den freien Kanten (6) der Zellwände (5) abnimmt. 4. honeycomb structure according to claim 3, comprising a plurality of radially offset rows of holes (9, 10), characterized in that the number of holes (9, 10) within a row from row to row with increasing radial distance (Al, A2) from the free edges (6) of the cell walls (5) decreases.
5. Wabenstruktur nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Löcher (9, 10) mit rundem, ovalem oder elliptischem Querschnitt ausgeführt sind.5. honeycomb structure according to one of claims 1 to 4, characterized in that the holes (9, 10) are designed with a round, oval or elliptical cross-section.
6. Wabenstruktur nach Anspruch 5, dadurch gekennzeichnet, dass die Löcher (9, 10) mechanisch, mittels Hochenergiestrahl, funkenerosiv oder elektrochemisch gefertigt sind.6. honeycomb structure according to claim 5, characterized in that the holes (9, 10) are made mechanically, by means of high energy beam, spark erosive or electrochemical.
7. Wabenstruktur nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Wabenzellen (2, 3, 4) einen vier- oder sechseckigen Querschnitt aufweisen, wobei jeweils zwei benachbarte Wabenzellen eine gemeinsame Zellwand und/oder zwei anei- nandergrenzende Zellwände besitzen.7. honeycomb structure according to one of claims 1 to 6, characterized in that the honeycomb cells (2, 3, 4) have a four- or hexagonal cross-section, each two adjacent honeycomb cells have a common cell wall and / or two adjoining cell walls.
8. Wabenstruktur nach Anspruch 7, dadurch gekennzeichnet, dass sie fügetechnisch in Schweiß- und/oder Löttechnik unter Verwendung abgewinkelter Blechstreifen (7, 8) oder integral in MIM-Technik (Metal Injection Molding) gefertigt ist. 8. honeycomb structure according to claim 7, characterized in that it is by joining technique in welding and / or soldering using angled sheet metal strips (7, 8) or integrally in MIM technology (Metal Injection Molding) is made.
EP08784243A 2007-07-05 2008-06-21 Honeycomb structure Withdrawn EP2165049A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007031404A DE102007031404A1 (en) 2007-07-05 2007-07-05 honeycomb structure
PCT/DE2008/001041 WO2009003445A1 (en) 2007-07-05 2008-06-21 Honeycomb structure

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EP2165049A1 true EP2165049A1 (en) 2010-03-24

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DE102010062087A1 (en) * 2010-11-29 2012-05-31 Siemens Aktiengesellschaft Turbomachine with sealing structure between rotating and stationary parts and method for producing this sealing structure
DE102014208801A1 (en) * 2014-05-09 2015-11-12 MTU Aero Engines AG Seal, method for producing a seal and turbomachine
JP6088029B2 (en) * 2015-11-19 2017-03-01 三菱重工業株式会社 Sealing device
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

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US3529905A (en) * 1966-12-12 1970-09-22 Gen Motors Corp Cellular metal and seal
DE19821365C2 (en) * 1998-05-13 2001-09-13 Man Turbomasch Ag Ghh Borsig Cooling a honeycomb seal in the part of a gas turbine charged with hot gas
US7105219B2 (en) * 2004-05-27 2006-09-12 Mitsubishi Heavy Industries, Ltd. Brazing construction and method of brazing an abradable sealing material
DE102005002270A1 (en) * 2005-01-18 2006-07-20 Mtu Aero Engines Gmbh engine

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US8501297B2 (en) 2013-08-06
US20100283211A1 (en) 2010-11-11
DE102007031404A1 (en) 2009-01-08
WO2009003445A1 (en) 2009-01-08

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