EP2423596A1 - Heat shield element - Google Patents

Heat shield element Download PDF

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Publication number
EP2423596A1
EP2423596A1 EP10174291A EP10174291A EP2423596A1 EP 2423596 A1 EP2423596 A1 EP 2423596A1 EP 10174291 A EP10174291 A EP 10174291A EP 10174291 A EP10174291 A EP 10174291A EP 2423596 A1 EP2423596 A1 EP 2423596A1
Authority
EP
European Patent Office
Prior art keywords
heat shield
shield element
side wall
recess
passage
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Withdrawn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
EP10174291A
Other languages
German (de)
French (fr)
Inventor
Andreas Böttcher
Olga Deiss
Christopher Grandt
Thomas Grieb
Ljiljana Hanf
Andre Kluge
Christian Scholz
Rostislav Teteruk
Daniel Vogtmann
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP10174291A priority Critical patent/EP2423596A1/en
Priority to RU2013113457/06A priority patent/RU2561957C2/en
Priority to PCT/EP2011/058153 priority patent/WO2012025265A2/en
Priority to CN201180041516.5A priority patent/CN103080651B/en
Priority to EP11721510.3A priority patent/EP2596290B1/en
Publication of EP2423596A1 publication Critical patent/EP2423596A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/007—Continuous combustion chambers using liquid or gaseous fuel constructed mainly of ceramic components

Definitions

  • the invention relates to a heat shield element according to the preamble of claim 1.
  • the heat shield elements of turbine engines such as gas turbines and turbine engines, as used in power-generating power plants and in larger aircraft, have correspondingly large shielded by heat shields surfaces in the interior of the combustion chambers.
  • the shield must be composed of a plurality of individual ceramic heat shield elements spaced apart from one another with sufficient clearance. This gap provides the heat shield elements with sufficient space for thermal expansion.
  • cooling fluid in the form of cooling air is blown through cooling channels as an effective countermeasure through the gaps in the direction of the combustion chamber. This cooling air is also used to specifically blow on the metallic brackets and thus to cool, with which the ceramic heat shield elements (CHS, Ceramic Heat Shields) are clamped to the support structure.
  • CHS Ceramic Heat Shields
  • brackets In order to carry out the brackets as simply and integrally as possible, a construction is known in which these brackets are on the one hand in the circulating in the support structure encircling and parallel mounting grooves inserted, and on the other hand formed with gripping portions in the formed in lateral edges of the ceramic heat shield elements Halteruten be clamped.
  • the heat shield elements are successively with the holders in the grooves of the Inserted support structure, wherein the trailing elements obstruct the previously positioned in their positions.
  • a circular series of heat shield elements can be formed in a combustion chamber of a gas turbine.
  • the last remaining heat shield element can not be mounted in this way because the mutually present, adjacent heat shield elements block a tangentially directed assembly movement. Often, such a last heat shield element is referred to as a dummy plate or dummy. Consequently, solutions are used with screws for attaching the last heat shield element, which allow mounting of the heat shield element in the direction of the surface normal of the support structure.
  • a known screwing uses this four screws, which engage in the, formed in lateral walls of the heat shield element recesses for this purpose.
  • This solution is disadvantaged in that the assembly requires a handling problem.
  • the handling of the four screws forces the use of reliable fixatives such as adhesive or tape. If the screws are lost, they must be found before commissioning due to high risk of damage to a turbine.
  • an overhead mounting is necessary, which is very difficult because the screws can tilt through the fixation by tape and thus can not be inserted into the holes provided. Since this is the last heat shield element, the screws can not be positioned by hand, but have to be threaded into the holes using an Allen key - without sight.
  • the object of the present invention is to specify a heat shield element, in particular a cap stone or a dummy, which allows easy mounting to the support structure.
  • a heat shield element with at least one side wall, wherein the side wall comprises at least one recess with a passage pointing in the direction of a support structure.
  • a fastening screw can be introduced, which is feasible through the passage for the vertical fixing of the heat shield element to a provided in the support structure bolting means.
  • the passage in the side wall is a securing means which is at least partially formed by the side wall. The securing means causes the lateral falling out of the fastening screw from the heat shield element during assembly difficult or even prevented.
  • the securing means is a wedge-shaped side wall piece, which is formed by an oblique recess at the passage.
  • an oblique recess can be incorporated directly in the production, so that no additional manufacturing step is necessary here.
  • the securing means is a web-shaped side wall piece. This is directly attached to the passage and can also mitübracht directly incorporated in the production of the entire heat shield element, for example.
  • the web-shaped side wall piece has a lateral opening into which the fastening screw can be introduced and parallel is displaceable to the web-shaped side wall piece in the direction of recess with passage. The fixing screw can be brought so easily to their place of installation.
  • the individual heat shield elements 13 or so-called stones are fastened to the support structure 17 by means of a total of four screw connections.
  • they are keystones or dummies of a heat shield.
  • recesses 4 or pockets are formed in the side walls 16 of the heat shield element 13 .
  • Each recess 4 further has in the direction of the support structure 17 facing passages, which are formed in the prior art as a lateral recess 1.
  • a fastening screw 18 is inserted laterally. Under the screw head of the fastening screw 18, a disc or an angle plate 2 is attached, which fixes the fastening screw 18 against rotation.
  • the fastening screw 18 with the disc or the angle plate 2 can thus laterally into the lateral recess 1 and
  • a mold cavity for receiving a correspondingly shaped tool tip of a screwing tool is provided in the head of the fastening screw 18.
  • This mold recess and the tool tip is preferably designed as one of the known Inbusstecktagenen, but may also have other shapes, such as cross or transverse slot.
  • the diameter of this access opening 5 is substantially smaller than the diameter of the head 2 of the fastening screw 18 and is dimensioned such that it is sufficient to allow a screwing tool to pass.
  • hot combustion gases therefore only pass to a limited extent through the size-minimized access openings 5 into the depressions 4 to the metallic panes 2 and heads of the fastening screws 18.
  • the depressions 4 are purged by the cooling fluid, which passes through the intermediate gaps d from the support structure 17 is blown into the combustion chamber to lock the wells 4 against the entry of hot gas.
  • the intermediate gap d is provided in order to provide sufficient space for the thermal expansion of individual heat shield elements 8, 13.
  • Each fastening screw 18 is screwed into a screw connection in the support structure 17, which in the present example is designed in each case as a cup spring assembly 19.
  • a threaded nut (not shown) serves to compress the disc spring assembly 19.
  • the biased plate spring assemblies 19 provide a resiliently yielding attachment of the heat shield element 13, which is required to z. B. due to thermal and thermoacoustic conditions induced movements compensate.
  • the four mounting screws 18 must be inserted laterally with the discs 2 in the respective lateral recesses 4 and recesses 1 and secured against falling out during assembly by adhesive tapes.
  • Fig. 2 1 shows a top view of a first heat shield element 14 according to the invention.
  • the heat shield element 14 has a depression 4 with a passage 30 in the direction of the support structure 17 (FIG. Fig. 1 ) for vertically fixing the heat shield element 14 to the support structure 17 (FIG. Fig. 1 ) by means of the fastening screw 18 (FIG. Fig. 3 ) on one in the support structure 17 ( Fig. 1 ) provided screwing 19 ( Fig. 1 ).
  • an oblique recess 31 is now mounted in the side wall 16, in which the fastening screw 18 (FIG. Fig. 3 ) can be used from the outside.
  • Fig. 3 shows the introduction of a fastening screw 18 in such a heat shield element 14.
  • the fastening screw 18 is inserted from the outside. Subsequently, the fastening screw 18 is tilted 40 and is thus brought into its final mounting position. By tilting 40 of the head of the fastening screw 18 slides into the recess 4 and the stem of the fastening screw 18 into the passage 30.
  • a wedge-shaped side wall portion 44 is formed at the passage 30, which serves as a securing means. This wedge-shaped side wall piece 44 complicates the lateral falling out of the fastening screw 18 from the heat shield element 14 during assembly.
  • the assembly is considerably simplified so that tools, such as adhesive tape and assembly tapes, can now be dispensed with.
  • the heat shield element 14 now has more ceramic material on the side wall 16 in the region of the depression 4 than the heat shield element 13 with the recess 1 (FIG. Fig. 1 ) in the prior art.
  • the stability of the heat shield element 14 according to the invention is thus increased in the region of the depression 4 and a breaking of the heat shield element edges is prevented.
  • the recess 31 can
  • in the manufacture of the heat shield element 14 are introduced with the same, so that here no additional, costly manufacturing step is more necessary.
  • Fig. 4 shows a plan view of a second invention- ⁇ es heat shield element 14.
  • the securing means is a web-shaped side wall portion 41. This is attached to the passage 30.
  • the web-shaped side wall piece 41 makes the lateral falling out of the fastening screw 18 difficult ( Fig. 1 ) from the heat shield element 14 during assembly.
  • the web-shaped side wall piece 41 has a lateral opening 42.
  • the fastening screw 18 ( Fig. 1 ) brought in.
  • the fastening screw 18 ( Fig. 1 ) parallel to the web-shaped side wall piece 41 in the direction of recess 4 with passage 30, and thus, as it were, pushed into the recess 4 and into the passage 30.
  • the web-shaped side wall portion 41 in the direction of the opening 42 have a thickening, resulting in falling out of the fastening screw 18 (FIG. Fig. 1 ) counteracts in the direction of the opening 42.
  • the heat shield element 14 now has more ceramic material on the side wall 16 in the region of the depression 4 than the heat shield element 13 with the recess 1 (FIG. Fig. 1 ) in the prior art. The stability of the heat shield element 14 according to the invention is thus increased in the region of the depression 4 and a breaking of the heat shield element edges is prevented.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Exhaust Silencers (AREA)
  • Fuses (AREA)
  • Connection Of Plates (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The heat shield element (14) includes a sidewall (16) having a recess (4) which is formed in a specific direction of a supporting structure facing a passage (30) formed in the sidewall. A fastening screw is screwed to the passage through the recess, for vertical mounting of the heat shield element to the supporting structure. A coupling unit is partially connected to the passage through the sidewall by a securing unit.

Description

Die Erfindung betrifft ein Hitzeschildelement nach dem Oberbegriff des Anspruchs 1.The invention relates to a heat shield element according to the preamble of claim 1.

In vielen technischen Anwendungen werden leistungsfähige keramische Hitzeschildelemente verwendet, um Temperaturen zwischen 1000 und 1600 Grad Celsius zu widerstehen. Insbesondere die Hitzeschildelemente von Turbinenmaschinen wie Gasturbinen und Turbinentriebwerken, wie sie in stromerzeugenden Kraftwerken und in größeren Flugzeugen Verwendung finden, weisen entsprechend große durch Hitzeschilde abzuschirmende Flächen im Inneren der Brennkammern auf. Wegen der thermischen Ausdehnung und wegen großer Abmessungen muss der Schild aus einer Vielzahl einzelner aus Keramik hergestellter Hitzeschildelemente zusammengesetzt werden, die voneinander mit einem ausreichenden Spalt beabstandet sind. Dieser Spalt bietet den Hitzeschildelementen ausreichenden Raum für die thermische Ausdehnung. Da jedoch der Spalt auch einen direkten Kontakt der heißen Verbrennungsgase mit der das Hitzeschildelement tragenden Tragstruktur ermöglicht, wird als eine effektive Gegenmaßnahme durch die Spalte in Richtung der Brennkammer ein Kühlfluid in Form von Kühlluft über Kühlkanäle eingeblasen. Diese Kühlluft wird ferner dazu verwendet, gezielt die metallischen Halterungen anzublasen und somit zu kühlen, mit welchen die keramischen Hitzeschildelemente (CHS, Ceramic Heat Shields) an der Tragstruktur verklammert sind.In many technical applications, powerful ceramic heat shield elements are used to withstand temperatures between 1000 and 1600 degrees Celsius. In particular, the heat shield elements of turbine engines, such as gas turbines and turbine engines, as used in power-generating power plants and in larger aircraft, have correspondingly large shielded by heat shields surfaces in the interior of the combustion chambers. Because of the thermal expansion and large dimensions, the shield must be composed of a plurality of individual ceramic heat shield elements spaced apart from one another with sufficient clearance. This gap provides the heat shield elements with sufficient space for thermal expansion. However, since the gap also enables direct contact of the hot combustion gases with the supporting structure carrying the heat shield member, cooling fluid in the form of cooling air is blown through cooling channels as an effective countermeasure through the gaps in the direction of the combustion chamber. This cooling air is also used to specifically blow on the metallic brackets and thus to cool, with which the ceramic heat shield elements (CHS, Ceramic Heat Shields) are clamped to the support structure.

Um die Halterungen möglichst einfach und einteilig auszuführen, ist eine Bauweise bekannt, bei der diese Halterungen einerseits in die in der Tragstruktur kreisumlaufend und parallel ausgebildete Montage-Nuten eingreifend einschiebbar sind, und andererseits mit ausgebildeten Greifabschnitten in die in seitlichen Kanten der keramischen Hitzeschildelemente ausgebildete Halternuten verklammert werden. Die Hitzeschildelemente werden nacheinander mit den Haltern in die Nuten der Tragstruktur eingeschoben, wobei die nachkommenden Elemente die vorher positionierten in ihren Positionen versperren. Auf diese Weise kann beispielsweise eine kreisumlaufende Reihe von Hitzeschildelementen in einer Brennkammer einer Gasturbine gebildet werden.In order to carry out the brackets as simply and integrally as possible, a construction is known in which these brackets are on the one hand in the circulating in the support structure encircling and parallel mounting grooves inserted, and on the other hand formed with gripping portions in the formed in lateral edges of the ceramic heat shield elements Halteruten be clamped. The heat shield elements are successively with the holders in the grooves of the Inserted support structure, wherein the trailing elements obstruct the previously positioned in their positions. In this way, for example, a circular series of heat shield elements can be formed in a combustion chamber of a gas turbine.

Das letzte verbleibende Hitzeschildelement kann jedoch nicht mehr auf diese Weise montiert werden, weil die beiderseits vorhandenen, benachbarten Hitzeschildelemente eine tangential gerichtete Montagebewegung blockieren. Oft wird ein derartiges letztes Hitzeschildelement als eine Attrappenplatte oder Attrappe bezeichnet. Folglich werden zum Anbringen des letzten Hitzeschildelements Lösungen mit Verschraubungen angewendet, die eine Montage des Hitzeschildelements in Richtung der Flächennormalen der Tragstruktur ermöglichen.However, the last remaining heat shield element can not be mounted in this way because the mutually present, adjacent heat shield elements block a tangentially directed assembly movement. Often, such a last heat shield element is referred to as a dummy plate or dummy. Consequently, solutions are used with screws for attaching the last heat shield element, which allow mounting of the heat shield element in the direction of the surface normal of the support structure.

Eine bekannte Verschraubung benutzt hierzu vier Schrauben, die in die, in seitlichen Wänden des Hitzeschildelements hierfür ausgebildete Aussparungen, eingreifen. Diese Lösung ist dadurch benachteiligt, dass die Montage ein Handhabungsproblem bedingt. Die Handhabung der vier Schrauben erzwingt beispielsweise die Verwendung von zuverlässigen Fixiermitteln wie Verklebung oder Klebeband. Gehen die Schrauben verloren, so müssen sie wegen hoher Beschädigungsgefahr einer Turbine unbedingt vor Inbetriebnahme gefunden werden. Ferner ist eine Über-Kopf-Montage notwendig, welche sehr schwierig ist, da die Schrauben durch die Fixierung per Klebeband verkippen können und somit nicht in die vorgesehenen Bohrungen eingeführt werden können. Da es sich um das letzte Hitzeschildelement handelt, können die Schrauben nicht per Hand positioniert werden, sondern müssen per Inbus - ohne Sicht - in die Bohrungen eingefädelt werden.A known screwing uses this four screws, which engage in the, formed in lateral walls of the heat shield element recesses for this purpose. This solution is disadvantaged in that the assembly requires a handling problem. The handling of the four screws, for example, forces the use of reliable fixatives such as adhesive or tape. If the screws are lost, they must be found before commissioning due to high risk of damage to a turbine. Furthermore, an overhead mounting is necessary, which is very difficult because the screws can tilt through the fixation by tape and thus can not be inserted into the holes provided. Since this is the last heat shield element, the screws can not be positioned by hand, but have to be threaded into the holes using an Allen key - without sight.

Es ist insbesondere schwierig, die Befestigungsschrauben in die entsprechenden Gewindebohrungen der Tragstruktur einzufädeln.In particular, it is difficult to thread the fastening screws into the corresponding threaded bores of the support structure.

Die vorliegende Erfindung macht es sich zur Aufgabe, ein Hitzeschildelement anzugeben, insbesondere einen Schlussstein oder eine Attrappe, das eine einfache Montage an der Tragstruktur zulässt.The object of the present invention is to specify a heat shield element, in particular a cap stone or a dummy, which allows easy mounting to the support structure.

Diese Aufgabe wird gelöst durch die Angabe eines Hitzeschildelements mit mindestens einer Seitenwand, wobei die Seitenwand zumindest eine Vertiefung mit einem in Richtung einer Tragstruktur weisenden Durchlass umfasst. In der Vertiefung ist eine Befestigungsschraube einbringbar, die durch den Durchlass zum senkrechten Befestigen des Hitzeschildelements an einem in der Tragstruktur vorgesehenen Verschraubungsmittel durchführbar ist. Erfindungsgemäß ist der Durchlass in der Seitenwand ein Sicherungsmittel, welches zumindest teilweise durch die Seitenwand gebildet wird. Das Sicherungsmittel bewirkt, dass das seitliche Herausfallen der Befestigungsschraube aus dem Hitzeschildelement bei der Montage erschwert oder gar verhindert wird. Somit ist eine schnellere, vereinfachte und sichere Montage des keramischen Hitzeschildelements, insbesondere der keramischen Attrappe, ohne zusätzliche Montagemittel wie Klebeband und Montagebänder möglich. Die Einbaudauer eines solchen Hitzeschildelements wird dadurch wesentlich verkürzt.This object is achieved by specifying a heat shield element with at least one side wall, wherein the side wall comprises at least one recess with a passage pointing in the direction of a support structure. In the recess, a fastening screw can be introduced, which is feasible through the passage for the vertical fixing of the heat shield element to a provided in the support structure bolting means. According to the invention, the passage in the side wall is a securing means which is at least partially formed by the side wall. The securing means causes the lateral falling out of the fastening screw from the heat shield element during assembly difficult or even prevented. Thus, a faster, simplified and secure mounting of the ceramic heat shield element, in particular the ceramic dummy, without additional mounting means such as tape and mounting tape is possible. The installation time of such a heat shield element is thereby significantly shortened.

Bevorzugt ist das Sicherungsmittel ein keilförmiges Seitenwandstück, welches durch eine schräge Ausnehmung am Durchlass ausgebildet wird. Eine solche schräge Ausnehmung kann gleich bei der Fertigung miteingebracht werden, so dass hier kein zusätzlicher Fertigungsschritt mehr notwendig ist.Preferably, the securing means is a wedge-shaped side wall piece, which is formed by an oblique recess at the passage. Such an oblique recess can be incorporated directly in the production, so that no additional manufacturing step is necessary here.

Alternativ ist das Sicherungsmittel ein stegförmiges Seitenwandstück. Dieses ist direkt am Durchlass angebracht und kann ebenfalls direkt bei der Fertigung des gesamten Hitzeschildelements mitangebracht z.B. miteingegossen werden. Bevorzugt weist das stegförmige Seitenwandstück eine seitliche Öffnung auf, in die die Befestigungsschraube einbringbar und parallel zum stegförmigen Seitenwandstück in Richtung Vertiefung mit Durchlass verschiebbar ist. Die Befestigungsschraube kann so sehr einfach zu ihrem Montageplatz hingeführt werden.Alternatively, the securing means is a web-shaped side wall piece. This is directly attached to the passage and can also mitübracht directly incorporated in the production of the entire heat shield element, for example. Preferably, the web-shaped side wall piece has a lateral opening into which the fastening screw can be introduced and parallel is displaceable to the web-shaped side wall piece in the direction of recess with passage. The fixing screw can be brought so easily to their place of installation.

Weitere Merkmale, Eigenschaften und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen unter Bezugnahme auf die beiliegendenFurther features, characteristics and advantages of the present invention will become apparent from the following description of embodiments with reference to the accompanying

Figuren 1 bis 4.

Fig. 1
zeigt eine Teilquerschnittsansicht durch eine Hitzeschildelementanordnung mit Hitzeschildelement nach dem Stand der Technik,
Fig. 2
zeigt eine Draufsicht auf ein erstes erfindungsgemäßes Hitzeschildelement,
Fig. 3
zeigt eine Teilquerschnittsansicht durch ein erstes erfindungsgemäßes Hitzeschildelement mit Befestigungsschraube,
Fig. 4
zeigt eine Draufsicht auf ein zweites erfindungsgemäßes Hitzeschildelement.
FIGS. 1 to 4 ,
Fig. 1
shows a partial cross-sectional view through a heat shield element arrangement with heat shield element according to the prior art,
Fig. 2
shows a plan view of a first heat shield element according to the invention,
Fig. 3
shows a partial cross-sectional view through a first inventive heat shield element with fastening screw,
Fig. 4
shows a plan view of a second heat shield element according to the invention.

Bei dem bekannten Hitzeschild werden die einzelnen Hitzeschildelemente 13 oder sogenannte Steine mithilfe von insgesamt vier Verschraubungen an der Tragstruktur 17 befestigt. Es handelt sich insbesondere um Schlusssteine oder Attrappen eines Hitzeschildes. In den seitlichen Wänden 16 des Hitzeschildelements 13 sind Vertiefungen 4 oder Taschen gebildet. Jede Vertiefung 4 weist ferner in Richtung der Tragstruktur 17 weisende Durchlässe auf, welche im Stand der Technik als eine seitliche Aussparung 1 ausgebildet sind. In die Vertiefungen 4 und den Aussparungen 1 wird eine Befestigungsschraube 18 seitlich eingelegt. Unter dem Schraubenkopf der Befestigungsschraube 18 ist eine Scheibe bzw. ein Winkelblech 2 angebracht, welche die Befestigungsschraube 18 gegen eine Verdrehung fixiert.In the known heat shield, the individual heat shield elements 13 or so-called stones are fastened to the support structure 17 by means of a total of four screw connections. In particular, they are keystones or dummies of a heat shield. In the side walls 16 of the heat shield element 13 recesses 4 or pockets are formed. Each recess 4 further has in the direction of the support structure 17 facing passages, which are formed in the prior art as a lateral recess 1. In the wells 4 and the recesses 1, a fastening screw 18 is inserted laterally. Under the screw head of the fastening screw 18, a disc or an angle plate 2 is attached, which fixes the fastening screw 18 against rotation.

Die Befestigungsschraube 18 mit der Scheibe bzw. dem Winkelblech 2 kann somit seitlich in die seitliche Aussparung 1 undThe fastening screw 18 with the disc or the angle plate 2 can thus laterally into the lateral recess 1 and

Vertiefung 4 eingelegt werden. Im Kopf der Befestigungsschraube 18 ist eine Formvertiefung zur Aufnahme einer korrespondierend geformten Werkzeugspitze eines Schraubwerkzeuges vorgesehen. Diese Formvertiefung und die Werkzeugspitze ist bevorzugt als eine der bekannten Inbussteckverbindungen ausgeführt, kann jedoch auch andere Formen aufweisen, wie Kreuz- oder Querschlitz.Well 4 are inserted. In the head of the fastening screw 18, a mold cavity for receiving a correspondingly shaped tool tip of a screwing tool is provided. This mold recess and the tool tip is preferably designed as one of the known Inbussteckverbindungen, but may also have other shapes, such as cross or transverse slot.

Axial über der Formvertiefung des Kopfes der Befestigungsschraube 18 ist seitens der Heißseite 21 des Hitzeschildelements 13 jeweils eine Zugangsöffnung 5 durchgehend bis in den durch die Vertiefung 4 ausgebildeten Raum getrieben. Der Durchmesser dieser Zugangsöffnung 5 ist wesentlich kleiner, als der Durchmesser des Kopfes 2 der Befestigungsschraube 18 und ist so bemessen, dass er dazu ausreicht, ein Schraubwerkzeug passieren zu lassen. Im Betrieb des Hitzeschildelements gelangen heiße Verbrennungsgase daher nur im eingeschränkten Maße durch die in der Größe minimierten Zugangsöffnungen 5 in die Vertiefungen 4 zu den metallischen Scheiben 2 und Köpfen der Befestigungsschrauben 18. Ferner werden die Vertiefungen 4 von dem Kühlfluid gespült, das durch die Zwischenspalte d von der Tragstruktur 17 aus in den Brennraum eingeblasen wird, um die Vertiefungen 4 gegen den Eintritt von Heißgas zu sperren. Der Zwischenspalt d ist vorgesehen, um der thermischen Ausdehnung einzelner Hitzschildelemente 8, 13 ausreichenden Raum zur Verfügung zu stellen.Axially above the mold recess of the head of the fastening screw 18 is driven by the hot side 21 of the heat shield element 13 each have an access opening 5 continuously into the space formed by the recess 4 space. The diameter of this access opening 5 is substantially smaller than the diameter of the head 2 of the fastening screw 18 and is dimensioned such that it is sufficient to allow a screwing tool to pass. During operation of the heat shield element, hot combustion gases therefore only pass to a limited extent through the size-minimized access openings 5 into the depressions 4 to the metallic panes 2 and heads of the fastening screws 18. Further, the depressions 4 are purged by the cooling fluid, which passes through the intermediate gaps d from the support structure 17 is blown into the combustion chamber to lock the wells 4 against the entry of hot gas. The intermediate gap d is provided in order to provide sufficient space for the thermal expansion of individual heat shield elements 8, 13.

Jede Befestigungsschraube 18 wird in eine Schraubverbindung in der Tragstruktur 17 eingeschraubt, die im vorliegenden Beispiel jeweils als ein Tellerfederpaket 19 ausgeführt ist. Eine (nicht dargestellte) Gewindemutter dient dazu, das Tellerfederpaket 19 zu komprimieren. Die vorgespannten Tellerfederpakete 19 sorgen für eine federnd nachgebende Befestigung des Hitzeschildelements 13, die erforderlich ist, um z. B. aufgrund thermischer und thermoakustischer Bedingungen induzierte Bewegungen auszugleichen.Each fastening screw 18 is screwed into a screw connection in the support structure 17, which in the present example is designed in each case as a cup spring assembly 19. A threaded nut (not shown) serves to compress the disc spring assembly 19. The biased plate spring assemblies 19 provide a resiliently yielding attachment of the heat shield element 13, which is required to z. B. due to thermal and thermoacoustic conditions induced movements compensate.

Bei der konventionellen Montage müssen die vier Befestigungsschrauben 18 mit den Scheiben 2 in die jeweiligen seitlichen Vertiefungen 4 und Aussparungen 1 seitlich eingelegt werden und gegen Herausfallen während der Montage durch Klebebänder gesichert werden.In the conventional assembly, the four mounting screws 18 must be inserted laterally with the discs 2 in the respective lateral recesses 4 and recesses 1 and secured against falling out during assembly by adhesive tapes.

Fig. 2 zeigt eine Draufsicht auf ein erstes erfindungsgemäßes Hitzeschildelement 14. Das Hitzeschildelement 14 weist eine Vertiefung 4 mit einem Durchlass 30 in Richtung der Tragstruktur 17 (Fig. 1) auf, zum senkrechten Befestigen des Hitzeschildelements 14 an der Tragstruktur 17 (Fig. 1) mithilfe der Befestigungsschraube 18 (Fig. 3) an einem in der Tragstruktur 17 (Fig. 1) vorgesehenen Verschraubungsmittel 19 (Fig. 1). An dem Durchlass 30 ist nun eine schräge Ausnehmung 31 in der Seitenwand 16 angebracht, in welcher die Befestigungsschraube 18 (Fig. 3) von außen eingesetzt werden kann. Fig. 2 1 shows a top view of a first heat shield element 14 according to the invention. The heat shield element 14 has a depression 4 with a passage 30 in the direction of the support structure 17 (FIG. Fig. 1 ) for vertically fixing the heat shield element 14 to the support structure 17 (FIG. Fig. 1 ) by means of the fastening screw 18 (FIG. Fig. 3 ) on one in the support structure 17 ( Fig. 1 ) provided screwing 19 ( Fig. 1 ). At the passage 30, an oblique recess 31 is now mounted in the side wall 16, in which the fastening screw 18 (FIG. Fig. 3 ) can be used from the outside.

Fig. 3 zeigt das Einbringen einer Befestigungsschraube 18 in ein solches Hitzeschildelement 14. In der schrägen Ausnehmung 31 wird die Befestigungsschraube 18 von außen eingesetzt. Anschließend wird die Befestigungsschraube 18 verkippt 40 und wird somit in ihre endgültige Montageposition gebracht. Durch das Verkippen 40 rutscht der Kopf der Befestigungsschraube 18 in die Vertiefung 4 sowie der Stiel der Befestigungsschraube 18 in den Durchlass 30. Durch die Ausnehmung 31 wird zudem am Durchlass 30 ein keilförmiges Seitenwandstück 44 ausgebildet, welches als Sicherungsmittel dient. Dieses keilförmige Seitenwandstück 44 erschwert das seitliche Herausfallen der Befestigungsschraube 18 aus dem Hitzeschildelement 14 bei der Montage. Dadurch wird die Montage erheblich vereinfacht, so dass auf Hilfsmittel, wie Klebeband und Montagebänder, nun verzichtet werden kann. Zudem weist das Hitzeschildelement 14 nun im Bereich der Vertiefung 4 mehr keramisches Material an der Seitenwand 16 auf, als das Hitzeschildelement 13 mit der Aussparung 1 (Fig. 1) im Stand der Technik. Die Stabilität des erfindungsgemäßen Hitzeschildelements 14 wird somit im Bereich der Vertiefung 4 erhöht und ein Ausbrechen der Hitzeschildelementkanten wird verhindert. Die Ausnehmung 31 kann zudem bei der Fertigung des Hitzeschildelements 14 gleich mit eingebracht werden, so dass hier kein zusätzlicher, kostenintensiver Fertigungsschritt mehr notwendig ist. Fig. 3 shows the introduction of a fastening screw 18 in such a heat shield element 14. In the oblique recess 31, the fastening screw 18 is inserted from the outside. Subsequently, the fastening screw 18 is tilted 40 and is thus brought into its final mounting position. By tilting 40 of the head of the fastening screw 18 slides into the recess 4 and the stem of the fastening screw 18 into the passage 30. Through the recess 31 also a wedge-shaped side wall portion 44 is formed at the passage 30, which serves as a securing means. This wedge-shaped side wall piece 44 complicates the lateral falling out of the fastening screw 18 from the heat shield element 14 during assembly. As a result, the assembly is considerably simplified so that tools, such as adhesive tape and assembly tapes, can now be dispensed with. In addition, the heat shield element 14 now has more ceramic material on the side wall 16 in the region of the depression 4 than the heat shield element 13 with the recess 1 (FIG. Fig. 1 ) in the prior art. The stability of the heat shield element 14 according to the invention is thus increased in the region of the depression 4 and a breaking of the heat shield element edges is prevented. The recess 31 can In addition, in the manufacture of the heat shield element 14 are introduced with the same, so that here no additional, costly manufacturing step is more necessary.

Fig. 4 zeigt eine Draufsicht auf ein zweites erfindungsgemä-βes Hitzeschildelement 14. Dabei ist das Sicherungsmittel ein stegförmiges Seitenwandstück 41. Dieses ist am Durchlass 30 angebracht. Das stegförmige Seitenwandstück 41 erschwert das seitliche Herausfallen der Befestigungsschraube 18 (Fig. 1) aus dem Hitzeschildelement 14 bei der Montage. Das stegförmige Seitenwandstück 41 weist eine seitliche Öffnung 42 auf. In diese wird die Befestigungsschraube 18 (Fig. 1) eingebracht. Anschließend wird die Befestigungsschraube 18 (Fig. 1) parallel zum stegförmigen Seitenwandstück 41 in Richtung Vertiefung 4 mit Durchlass 30 verschoben, und quasi somit in die Vertiefung 4 und in den Durchlass 30 hineingeschoben. Dabei kann das stegförmige Seitenwandstück 41 in Richtung der Öffnung 42 eine Verdickung aufweisen, was einem Herausfallen der Befestigungsschraube 18 (Fig. 1) in Richtung der Öffnung 42 entgegenwirkt. Auch hier weist das Hitzeschildelement 14 nun im Bereich der Vertiefung 4 mehr keramisches Material an der Seitenwand 16 auf als das Hitzeschildelement 13 mit der Aussparung 1 (Fig. 1) im Stand der Technik. Die Stabilität des erfindungsgemäßen Hitzeschildelements 14 wird somit im Bereich der Vertiefung 4 erhöht und ein Ausbrechen der Hitzeschildelementkanten wird verhindert. Fig. 4 shows a plan view of a second invention-βes heat shield element 14. In this case, the securing means is a web-shaped side wall portion 41. This is attached to the passage 30. The web-shaped side wall piece 41 makes the lateral falling out of the fastening screw 18 difficult ( Fig. 1 ) from the heat shield element 14 during assembly. The web-shaped side wall piece 41 has a lateral opening 42. In this, the fastening screw 18 ( Fig. 1 ) brought in. Subsequently, the fastening screw 18 ( Fig. 1 ) parallel to the web-shaped side wall piece 41 in the direction of recess 4 with passage 30, and thus, as it were, pushed into the recess 4 and into the passage 30. In this case, the web-shaped side wall portion 41 in the direction of the opening 42 have a thickening, resulting in falling out of the fastening screw 18 (FIG. Fig. 1 ) counteracts in the direction of the opening 42. Here too, the heat shield element 14 now has more ceramic material on the side wall 16 in the region of the depression 4 than the heat shield element 13 with the recess 1 (FIG. Fig. 1 ) in the prior art. The stability of the heat shield element 14 according to the invention is thus increased in the region of the depression 4 and a breaking of the heat shield element edges is prevented.

Claims (4)

Hitzeschildelement (14) mit mindestens einer Seitenwand (16), wobei die Seitenwand (16) zumindest eine Vertiefung (4) mit einem in Richtung einer Tragstruktur (17) weisenden Durchlass (30) umfasst, wobei in der Vertiefung (4) eine Befestigungsschraube (18) einbringbar ist, die durch den Durchlass (30) zum senkrechten Befestigen des Hitzeschildelements (14) an einem in der Tragstruktur (17) vorgesehenen Verschraubungsmittel (19) durchführbar ist,
dadurch gekennzeichnet, dass der Durchlass (30) in der Seitenwand (16) ein Sicherungsmittel (41,44), welches zumindest teilweise durch die Seitenwand (16) gebildet wird.Heat shield element (14) having at least one side wall (16), wherein the side wall (16) comprises at least one recess (4) with a passage (30) pointing in the direction of a support structure (17), wherein in the recess (4) a fixing screw (4) 18) can be introduced, which can be performed through the passage (30) for vertically fixing the heat shield element (14) to a screwing means (19) provided in the support structure (17),
characterized in that the passage (30) in the side wall (16) comprises securing means (41, 44) formed at least partially through the side wall (16). Hitzeschildelement (14) nach Anspruch 1,
dadurch gekennzeichnet, dass das Sicherungsmittel ein keilförmiges (44) Seitenwandstück ist, welches durch eine schräge Ausnehmung (31) am Durchlass (30) ausgebildet wird.A heat shield element (14) according to claim 1,
characterized in that the securing means is a wedge-shaped (44) side wall piece which is formed by an oblique recess (31) at the passage (30). Hitzeschildelement (14) nach Anspruch 1,
dadurch gekennzeichnet, dass das Sicherungsmittel ein stegförmiges Seitenwandstück (41) ist.A heat shield element (14) according to claim 1,
characterized in that the securing means is a web-shaped side wall piece (41). Hitzeschildelement (14) nach Anspruch 3,
dadurch gekennzeichnet, dass das stegförmige Seitenwandstück (41) eine seitliche Öffnung (42) aufweist, in die die Befestigungsschraube (18) einbringbar und parallel zum stegförmigen Seitenwandstück (41) in Richtung Vertiefung (4) mit Durchlass (30) verschiebbar ist.A heat shield element (14) according to claim 3,
characterized in that the web-shaped side wall piece (41) has a lateral opening (42), in which the fastening screw (18) can be introduced and parallel to the web-shaped side wall piece (41) in the direction of recess (4) with passage (30) slidably.
EP10174291A 2010-08-27 2010-08-27 Heat shield element Withdrawn EP2423596A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP10174291A EP2423596A1 (en) 2010-08-27 2010-08-27 Heat shield element
RU2013113457/06A RU2561957C2 (en) 2010-08-27 2011-05-19 Element of thermal protection shield
PCT/EP2011/058153 WO2012025265A2 (en) 2010-08-27 2011-05-19 Heat shield element
CN201180041516.5A CN103080651B (en) 2010-08-27 2011-05-19 heat shield element
EP11721510.3A EP2596290B1 (en) 2010-08-27 2011-05-19 Heat shield element

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Application Number Priority Date Filing Date Title
EP10174291A EP2423596A1 (en) 2010-08-27 2010-08-27 Heat shield element

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CN107076414B (en) * 2014-10-20 2019-06-14 西门子股份公司 Heat shield element and the method manufactured for it

Also Published As

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CN103080651B (en) 2016-03-02
WO2012025265A3 (en) 2013-01-03
RU2561957C2 (en) 2015-09-10
EP2596290A2 (en) 2013-05-29
WO2012025265A2 (en) 2012-03-01
EP2596290B1 (en) 2015-08-05
CN103080651A (en) 2013-05-01
RU2013113457A (en) 2014-10-10

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