EP2137382A1 - Stator heat shield - Google Patents

Stator heat shield

Info

Publication number
EP2137382A1
EP2137382A1 EP08735874A EP08735874A EP2137382A1 EP 2137382 A1 EP2137382 A1 EP 2137382A1 EP 08735874 A EP08735874 A EP 08735874A EP 08735874 A EP08735874 A EP 08735874A EP 2137382 A1 EP2137382 A1 EP 2137382A1
Authority
EP
European Patent Office
Prior art keywords
stator heat
heat shield
statorhitzeschild
gas turbine
ribs
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
EP08735874A
Other languages
German (de)
French (fr)
Other versions
EP2137382B1 (en
Inventor
Alexander Khanin
Edouard Sloutski
Sergey Vorontsov
Anton Sumin
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.)
General Electric Technology GmbH
Original Assignee
Alstom Technology 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 Alstom Technology AG filed Critical Alstom Technology AG
Priority to SI200830743T priority Critical patent/SI2137382T1/en
Publication of EP2137382A1 publication Critical patent/EP2137382A1/en
Application granted granted Critical
Publication of EP2137382B1 publication Critical patent/EP2137382B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/11—Shroud seal segments
    • 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
    • F05D2240/00—Components
    • F05D2240/55—Seals
    • F05D2240/57—Leaf seals
    • 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
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • F05D2260/201—Heat transfer, e.g. cooling by impingement of a fluid
    • 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
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • F05D2260/221—Improvement of heat transfer
    • F05D2260/2214—Improvement of heat transfer by increasing the heat transfer surface
    • F05D2260/22141—Improvement of heat transfer by increasing the heat transfer surface using fins or ribs

Definitions

  • the invention relates to a stator heat shield for a gas turbine and a gas turbine equipped with such a stator heat shield.
  • Statorhitzeschilde are in the installed state of a stator or on a housing of a gas turbine. In this case, they are usually mounted on a guide blade carrier and form a radial boundary for a hot gas path of the gas turbine in the region of rotor blades of the gas turbine. In this case, a plurality of such Statorhitzeschilde is arranged adjacent to each other in the circumferential direction relative to a rotational axis of the rotor with respect to each other, whereby a closed ring of individual Statorhitzeschilden is formed.
  • the individual stator heat shields form ring segments. The stator heat shields protect the housing or the guide blade carrier from being exposed to the hot gas of the gas turbine.
  • stator heat shields an outside of the stator heat shields is exposed to the hot gas, while a side facing away from the hot gas path inside of the respective Statorhitzeschilds is acted upon with a suitable cooling gas, to cool the respective stator heat shield.
  • a suitable cooling gas By cooling the service life of the stator heat shields can be increased. In principle, however, there is a need to additionally increase the service life of such stator heat shields.
  • the invention deals with the problem of providing an improved embodiment for a stator heat shield or for a gas turbine equipped therewith, which is characterized in particular by an increased service life of the stator heat shields.
  • the present invention is based on the general idea of combining a flapper cooling, a convection cooling and a sealing element cooling system with each other in the respective stator heat shield. It has been found that a combination of these cooling methods or cooling techniques cause effective cooling and a favorable temperature distribution in the respective stator heat shield, which correspondingly increases the lifetime of the stator heat shields.
  • a plurality of ribs formed on an inner side facing away from a hot gas path of the gas turbine in the installed state of the stator heat shield which axially extend in the installed state with respect to a rotational axis of a rotor of the gas turbine and spaced from each other in the circumferential direction are, can be formed on the inside of several channels. At the same time, these ribs serve to stiffen the respective stator heat shield.
  • a baffle plate is also arranged, which rests on the ribs. In this way, heat can be transferred from the stator heat shield to the respective baffle plate by convection within the channels.
  • the baffle plate itself is acted upon in the operation of the gas turbine by a cooling gas, whereby the heat from the baffle plate can be discharged.
  • the respective stator heat shield is provided with a groove on at least one end face delimiting the stator heat shield in the circumferential direction, into which at least one sealing element can be inserted.
  • Two circumferentially adjacent stator heat shields adjoin one another in the region of these end faces, wherein a relatively small gap is formed as a rule.
  • the respective sealing element now engages in the mutually aligned grooves of the two mutually opposite in the gap end faces and thereby closes the gap and thus the connection between the outside facing the hot gas path with a the inside facing cooling gas path.
  • stator heat shield For cooling these sealing elements, it is proposed according to the invention to provide the stator heat shield with a plurality of bores, which respectively open at one end to the inside and the other end to the end, in such a way that they open out from the groove in the direction of the outside. Further, the holes are arranged spaced apart in the axial direction. Through these holes, cooling gas can pass from the cooling gas path to the hot gas side in the gap between adjacent stator heat shields in the circumferential direction and can there apply cooling gas to the sealing elements. In particular, film cooling of the sealing elements as well as the opposite end faces of the adjacent stator heat shields in the gap can be achieved in the region of the gap.
  • a targeted cooling of this area reduces the temperatures at the respective stator heat shield at the front ends, which reduces the heat load of the stator heat shield and increases its lifetime.
  • Particularly advantageous is an embodiment in which at the respective end face to the groove towards the outside spaced recess is formed, which is open to the outside, which extends in the axial direction over the holes of the respective end face and in which open the holes , By providing such a recess it is achieved that cooling gas can enter into the hot gas side region of the gap even if the stator heat shields adjacent in the circumferential direction are moved towards one another with their end faces opposite each other in the gap, whereby the gap is minimized. Such a gap reduction can occur in certain operating situations of the gas turbine.
  • 1 shows an axial section through a gas turbine in the region of a stator heat shield
  • 2 is a perspective view of a stator heat shield
  • FIG. 3 shows a cross section of the Statorhitzeschilds in the region of an end face corresponding to section lines III in Fig. 2nd
  • a gas turbine 1 of which only a small section is shown here, has a stator 2 and a rotor 3, which are likewise only partially shown. From the stator 2 guide vanes 4 are partially visible and a portion of a vane carrier 5. On the guide vane 5 are on the one hand the vanes 4 attached to the other stator stator 5 are also attached to the stator vane 5, one of which is recognizable here. From the rotor 3, only one blade 7 can be seen here, which is arranged between the two guide vanes 4. A dot-dash line indicates a rotation axis 8 about which the rotor 3 rotates during operation of the gas turbine 1 and which defines the axial direction of the gas turbine 1.
  • Axial in the present context thus means parallel to the axis of rotation 8, while a radial direction is perpendicular to the axis of rotation 8 and a combatsutter is oriented along a circular path about the axis of rotation 8.
  • the blade 7 is arranged axially between the two guide vanes 4.
  • the stator heat shield 6 is disposed radially of the blade 7 and positioned axially between the two vanes 4.
  • the individual Statorhitzeschilde 6 form segments which are arranged adjacent to each other in the circumferential direction and form a closed circular ring which encloses a blade row, which by in the circumferential direction adjacent blades 7 is formed.
  • the respective stator heat shield 6 separates a hot gas path 9 of the gas turbine 1, indicated by an arrow, from a cooling gas path 10, likewise indicated by an arrow, which runs essentially in the stator 2.
  • the respective stator heat shield 6 has an outer side 11, which faces the hot gas path 9 in the installed state.
  • the stator heat shield 6 has an inner side 12, which faces the cooling gas path 10 and is remote from the hot gas path 9 and from the outer side 11.
  • the stator heat shield 6 On its inner side 12, the stator heat shield 6 has a plurality of ribs 13. These ribs 13 extend axially in the installed state and are preferably designed in a straight line. Furthermore, the ribs 13 are arranged spaced from one another in the circumferential direction.
  • at least one baffle plate 14, which rests on the ribs 13, is arranged on the inner side 12. In the example shown in FIG. 2, the baffle plate 14 extends only over one half of the inner side 12. A second baffle plate 14 covering the other half is omitted here for better recognition of the ribs 13. Likewise, a single baffle plate 14 may be provided which covers all the ribs 13.
  • the respective stator heat shield 6 also has, in the circumferential direction, two end faces 15, each delimiting the stator heat shield 6 in the circumferential direction. In at least one of these end faces 15, a groove 16 is incorporated. Preferably, in each case such a groove 16 is incorporated in both end faces 15.
  • two stator heat shields 6 which are adjacent to one another in the circumferential direction adjoin one another in the region of these end faces 15, with two such end faces 15 facing each other in an axial gap 17 indicated in FIG. 3.
  • the grooves 16 are arranged so that they are opposite each other in the axial gap 17 end faces 15th aligned with each other in alignment.
  • the respective groove 16 serves to receive at least one sealing element 18, which is configured, for example, band-shaped or strip-shaped.
  • such a sealing element 18 engages in two mutually aligned grooves 16 at two in the gap 17 opposite end faces 15 at the same time. In this way, the respective sealing element 18 can seal off the axial gap 17, ie separate the hot gas path 9 facing the hot gas path from the cooling gas side facing the cooling gas path 10.
  • the stator heat shield 6 is also equipped with a plurality of holes 19.
  • Each of these holes 19 connects the inner side 12 of one of the end faces 15. Accordingly, the respective bore 19 opens at one end to the inner side 12 and the other end to the respective end face 15.
  • the mouth of the respective bore 19 at the respective end face 15 is spaced from the groove 16, in the direction of the outside 11. In this way, through the bores 19, cooling gas can pass from the cooling gas side or from the cooling gas path 10 to the hot gas side of the gap 17, which is open toward the hot gas path 9.
  • the individual bores 19 are, as shown in FIG. 2, spaced from one another in the axial direction on the respective end face 15 of the stator heat shield 6.
  • the stator heat shield 6 has on at least one of the end faces 15 a recess 20 which is open toward the outside 11 and which extends in the axial direction along the respective side 15.
  • the front side 15 provided with the bores 19 is equipped with the recess 20.
  • the recess 20 extends along all holes 19, so that the holes 19 each open in the recess 20.
  • both end faces 15 are provided with holes 19 and such a recess 20.
  • the recesses 20 make it possible for the cooling gas to escape through the bores 19 to a sufficient extent, even if the gap 17 becomes comparatively narrow in the circumferential direction due to relative movements of the adjacent stator heat shields 6.
  • a cooling of the sealing elements 18 can be effected during operation of the gas turbine 1.
  • a cooling gas film can be produced on the hot gas side of the sealing elements 18, which obstructs direct hot gas loading of the sealing elements 18.
  • the peripheral end regions of the respective stator heat shield 6 provided with the end faces 15 can thereby effectively be cooled, on the one hand by the flow of these end regions with cooling gas and, on the other hand, by the formation of the cooling gas film on the areas of the front side 15 and the outside 11 exposed to the hot gas path 9 ,
  • a depression 21 is expediently formed on the inside 12.
  • the ribs 13 are arranged, in such a way that within the recess 21, a system of mutually communicating channels 22 is formed.
  • the at least one baffle plate 14 covers this system from channels 22 to the cooling gas path 10 from.
  • Within these channels 22 there is a convective heat transfer between the respective stator heat shield 6 and the respective baffle plate 14.
  • a cooling gas flow can be guided by the channel system formed with the channels 22.
  • the respective baffle plate 14 has a plurality of passage openings 23, via the cooling gas from the cooling gas path 10th can pass through the baffle plate 14 in the channels 22.
  • the aforementioned holes 19 now open on the inner side 12 in said recess 21 or in one of the channels 22.
  • the cooling gas entering the channel system through the passage openings 23 can exit via the holes 19 and pass through the stator heat shield 6 to the hot gas side.
  • brackets 24 are formed here, with the aid of which the respective baffle plate 14 can be fixed to the stator heat shield 6.
  • the respective holders 24 overlap the respective flat plate 14 for this purpose.
  • the ribs 13 each have a certain rib height 25, with which they extend in the radial direction. With this fin height 25, the ribs 13 are here from a bottom of the recess 21 from. Furthermore, the individual ribs 13 in the circumferential direction have a rib spacing 26 from one another. According to an advantageous embodiment, the fin height 25 and the fin spacing 26 are coordinated so that a ratio of fin height 25 to rib spacing 26 is less than 0.5 and preferably greater than 0.3. Suitably, said ratio is in the range of 0.328 to 0.492.
  • each individual hole 19 has in the axial direction a certain bore spacing 27 to each other.
  • each individual bore has a specific bore diameter 28.
  • the respective bore diameter 28 and the bore spacing 27 to match so that there is a ratio of bore diameter 28 to bore spacing 27, which is greater than 0.09 is and which is suitably less than 0.15.
  • said ratio may be in a range of 0.0992 to 0.1488.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The present invention relates to a stator heat shield (6) for a gas turbine (1), comprising an outer side (11) which, in the installed state, faces a hot gas path (9) of the gas turbine (1), an inner side (12) facing away from the outer side (11), multiple ribs which are formed at the inner side (12) and which, in the installed state, extend axially with respect to an axis of rotation (8) of a rotor (3) of the gas turbine (1) and which are at a distance from one another in the circumferential direction, at least one splash plate (14) which is disposed at the inner side (12) and which lies on the ribs (13), at least one groove (16) which is formed in a front face (15) which forms the boundary of the stator heat shield (6) in the circumferential direction and into which at least one sealing element (18) can be inserted, and multiple boreholes (19) which terminate at a distance from one another in the direction to the outer side (11), with one end at the inner side (12) and the other end at the front face (15) of the groove (16), and which are at a distance from one another in the axial direction.

Description

Statorhitzeschild stator heat
Technisches GebietTechnical area
Die Erfindung betrifft ein Statorhitzeschild für eine Gasturbine sowie eine mit einem derartigen Statorhitzeschild ausgestattete Gasturbine.The invention relates to a stator heat shield for a gas turbine and a gas turbine equipped with such a stator heat shield.
Stand der TechnikState of the art
Statorhitzeschilde befinden sich im Einbauzustand an einem Stator beziehungsweise an einem Gehäuse einer Gasturbine. Dabei sind sie üblicherweise an einem Leitschaufelträger angebracht und bilden im Bereich von Laufschaufeln eines Rotors der Gasturbine eine radiale Begrenzung für einen Heißgaspfad der Gasturbine. Dabei ist in der Regel eine Vielzahl derartiger Statorhitzeschilde bezüglich einer Rotationsachse des Rotors in Umfangsrichtung zueinander benachbart angeordnet, wodurch ein geschlossener Ring aus einzelnen Statorhitzeschilden gebildet wird. Die einzelnen Statorhitzeschilde bilden dabei Ringsegmente. Die Statorhitzeschilde schützen das Gehäuse beziehungsweise den Leitschaufelträger vor einer Beaufschlagung mit dem Heißgas der Gasturbine. Dabei ist eine Außenseite der Statorhitzeschilde dem Heißgas ausgesetzt, während eine vom Heißgaspfad abgewandte Innenseite des jeweiligen Statorhitzeschilds mit einem geeigneten Kühlgas beaufschlagt wird, um das jeweilige Statorhitzeschild zu kühlen. Durch die Kühlung kann die Standzeit der Statorhitzeschilde vergrößert werden. Grundsätzlich besteht jedoch das Bedürfnis, die Standtzeit derartiger Statorhitzeschilde zusätzlich zu vergrößern.Statorhitzeschilde are in the installed state of a stator or on a housing of a gas turbine. In this case, they are usually mounted on a guide blade carrier and form a radial boundary for a hot gas path of the gas turbine in the region of rotor blades of the gas turbine. In this case, a plurality of such Statorhitzeschilde is arranged adjacent to each other in the circumferential direction relative to a rotational axis of the rotor with respect to each other, whereby a closed ring of individual Statorhitzeschilden is formed. The individual stator heat shields form ring segments. The stator heat shields protect the housing or the guide blade carrier from being exposed to the hot gas of the gas turbine. In this case, an outside of the stator heat shields is exposed to the hot gas, while a side facing away from the hot gas path inside of the respective Statorhitzeschilds is acted upon with a suitable cooling gas, to cool the respective stator heat shield. By cooling the service life of the stator heat shields can be increased. In principle, however, there is a need to additionally increase the service life of such stator heat shields.
Darstellung der ErfindungPresentation of the invention
Hier setzt die vorliegende Erfindung an. Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, beschäftigt sich mit dem Problem, für ein Statorhitzeschild beziehungsweise für eine damit ausgestattete Gasturbine eine verbesserte Ausführungsform anzugeben, die sich insbesondere durch eine erhöhte Standzeit der Statorhitzeschilde auszeichnet.This is where the present invention begins. The invention, as characterized in the claims, deals with the problem of providing an improved embodiment for a stator heat shield or for a gas turbine equipped therewith, which is characterized in particular by an increased service life of the stator heat shields.
Erfindungsgemäß wird dieses Problem durch die Gegenstände der unabhängigen Ansprüche gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.According to the invention, this problem is solved by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.
Die vorliegende Erfindung beruht auf dem allgemeinen Gedanken, beim jeweiligen Statorhitzeschild eine Prallplattenkühlung, eine Konvektionskühlung und eine Dichtelementkühlung miteinander zu kombinieren. Es hat sich gezeigt, dass eine Kombination dieser Kühlverfahren oder Kühltechniken eine effektive Kühlung und eine günstige Temperaturverteilung im jeweiligen Statorhitzeschild bewirken, was die Lebensdauer der Statorhitzeschilde entsprechend erhöht.The present invention is based on the general idea of combining a flapper cooling, a convection cooling and a sealing element cooling system with each other in the respective stator heat shield. It has been found that a combination of these cooling methods or cooling techniques cause effective cooling and a favorable temperature distribution in the respective stator heat shield, which correspondingly increases the lifetime of the stator heat shields.
Durch mehrere an einer im Einbauzustand des Statorhitzeschilds von einem Heißgaspfad der Gasturbine abgewandten Innenseite ausgebildete Rippen, die sich im Einbauzustand bezüglich einer Rotationsachse eines Rotors der Gasturbine axial erstrecken und in Umfangsrichtung zueinander beabstandet sind, lassen sich an der Innenseite mehrere Kanäle ausbilden. Gleichzeitig dienen diese Rippen zur Aussteifung des jeweiligen Statorhitzeschilds. An der Innenseite ist außerdem eine Prallplatte angeordnet, die auf den Rippen aufliegt. Auf diese Weise kann innerhalb der Kanäle durch Konvektion Wärme vom Statorhitzeschild auf die jeweilige Prallplatte übertragen werden. Die Prallplatte selbst ist im Betrieb der Gasturbine von einem Kühlgas beaufschlagt, wodurch die Wärme von der Prallplatte abführbar ist. Des weiteren ist das jeweilige Statorhitzeschild zumindest an einer das Statorhitzeschild in Umfangshchtung begrenzenden Stirnseite mit einer Nut ausgestattet, in die zumindest ein Dichtelement einsetzbar ist. Zwei in Umfangsrichtung zueinander benachbarte Statorhitzeschilde grenzen im Bereich dieser Stirnseiten aneinander an, wobei in der Regel ein relativ kleiner Spalt ausgebildet ist. Das jeweilige Dichtelement greift nun in die zueinander fluchtend ausgerichteten Nuten der beiden einander im Spalt gegenüberliegenden Stirnseiten ein und verschließt dadurch den Spalt und somit die Verbindung zwischen dem der Außenseite zugewandten Heißgaspfad mit einem der Innenseite zugewandten Kühlgaspfad. Zur Kühlung dieser Dichtelemente wird erfindungsgemäß vorgeschlagen, das Statorhitzeschild mit mehreren Bohrungen auszustatten, die jeweils einenends an der Innenseite und anderenends an der Stirnseite münden, und zwar so, dass sie von der Nut in Richtung zur Außenseite hin beabstandet münden. Ferner sind die Bohrungen in axialer Richtung voneinander beabstandet angeordnet. Über diese Bohrungen kann Kühlgas vom Kühlgaspfad auf die Heißgasseite in den Spalt zwischen in Umfangsrichtung benachbarten Statorhitzeschilden gelangen und kann dort die Dichtelemente mit Kühlgas beaufschlagen. Insbesondere kann im Bereich des Spalts eine Filmkühlung der Dichtelemente sowie der im Spalt einander gegenüberliegenden Stirnseiten der benachbarten Statorhitzeschilde erzielt werden. Eine gezielte Kühlung dieses Bereichs reduziert die Temperaturen am jeweiligen Statorhitzeschild an den stirnseitigen Enden, was die Hitzebelastung des Statorhitzeschilds reduziert und dessen Lebenszeit erhöht. Besonders vorteilhaft ist eine Ausführungsform, bei der an der jeweiligen Stirnseite eine zur Nut in Richtung zur Außenseite hin beabstandete Ausnehmung ausgebildet ist, die zur Außenseite hin offen ist, die sich in axialer Richtung über die Bohrungen der jeweiligen Stirnseite erstreckt und in der die Bohrungen münden. Durch das Vorsehen einer derartigen Ausnehmung wird erreicht, dass Kühlgas auch dann in den heißgasseitigen Bereich des Spalts eintreten kann, wenn die in Umfangsrichtung benachbarten Statorhitzeschilde mit ihren einander im Spalt gegenüberliegenden Stirnseiten aufeinanderzu verstellt sind, wodurch der Spalt minimiert wird. Eine derartige Spaltreduzierung kann in bestimmten Betriebssituationen der Gasturbine auftreten.By a plurality of ribs formed on an inner side facing away from a hot gas path of the gas turbine in the installed state of the stator heat shield, which axially extend in the installed state with respect to a rotational axis of a rotor of the gas turbine and spaced from each other in the circumferential direction are, can be formed on the inside of several channels. At the same time, these ribs serve to stiffen the respective stator heat shield. On the inside of a baffle plate is also arranged, which rests on the ribs. In this way, heat can be transferred from the stator heat shield to the respective baffle plate by convection within the channels. The baffle plate itself is acted upon in the operation of the gas turbine by a cooling gas, whereby the heat from the baffle plate can be discharged. Furthermore, the respective stator heat shield is provided with a groove on at least one end face delimiting the stator heat shield in the circumferential direction, into which at least one sealing element can be inserted. Two circumferentially adjacent stator heat shields adjoin one another in the region of these end faces, wherein a relatively small gap is formed as a rule. The respective sealing element now engages in the mutually aligned grooves of the two mutually opposite in the gap end faces and thereby closes the gap and thus the connection between the outside facing the hot gas path with a the inside facing cooling gas path. For cooling these sealing elements, it is proposed according to the invention to provide the stator heat shield with a plurality of bores, which respectively open at one end to the inside and the other end to the end, in such a way that they open out from the groove in the direction of the outside. Further, the holes are arranged spaced apart in the axial direction. Through these holes, cooling gas can pass from the cooling gas path to the hot gas side in the gap between adjacent stator heat shields in the circumferential direction and can there apply cooling gas to the sealing elements. In particular, film cooling of the sealing elements as well as the opposite end faces of the adjacent stator heat shields in the gap can be achieved in the region of the gap. A targeted cooling of this area reduces the temperatures at the respective stator heat shield at the front ends, which reduces the heat load of the stator heat shield and increases its lifetime. Particularly advantageous is an embodiment in which at the respective end face to the groove towards the outside spaced recess is formed, which is open to the outside, which extends in the axial direction over the holes of the respective end face and in which open the holes , By providing such a recess it is achieved that cooling gas can enter into the hot gas side region of the gap even if the stator heat shields adjacent in the circumferential direction are moved towards one another with their end faces opposite each other in the gap, whereby the gap is minimized. Such a gap reduction can occur in certain operating situations of the gas turbine.
Weitere wichtige Merkmale und Vorteile der vorliegenden Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the present invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Komponenten beziehen.A preferred embodiment of the invention is illustrated in the drawings and will be explained in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.
Es zeigen, jeweils schematischIt show, each schematically
Fig. 1 einen Axialschnitt durch eine Gasturbine im Bereich eines Statorhitzeschilds, Fig. 2 eine perspektivische Ansicht eines Statorhitzeschilds,1 shows an axial section through a gas turbine in the region of a stator heat shield, 2 is a perspective view of a stator heat shield,
Fig. 3 einen Querschnitt des Statorhitzeschilds im Bereich einer Stirnseite entsprechend Schnittlinien III in Fig. 2.3 shows a cross section of the Statorhitzeschilds in the region of an end face corresponding to section lines III in Fig. 2nd
Wege zur Ausführung der ErfindungWays to carry out the invention
Entsprechend Fig. 1 weist eine Gasturbine 1 , von der hier nur ein kleiner Ausschnitt dargestellt ist, einen Stator 2 sowie einen Rotor 3 auf, die ebenfalls nur teilweise dargestellt sind. Vom Stator 2 sind Leitschaufeln 4 teilweise erkennbar sowie ein Abschnitt eines Leitschaufelträgers 5. Am Leitschaufelträger 5 sind zum einen die Leitschaufeln 4 befestigt zum andern sind am Leitschaufelträger 5 auch Statorhitzeschilde 6 angebracht, von denen hier eines erkennbar ist. Vom Rotor 3 ist hier nur eine Laufschaufel 7 erkennbar, die zwischen den beiden Leitschaufeln 4 angeordnet ist. Mit strichpunktierter Linie ist eine Rotationsachse 8 angedeutet, um welche der Rotor 3 im Betrieb der Gasturbine 1 rotiert und welche die axiale Richtung der Gasturbine 1 definiert. Axial bedeutet im vorliegenden Zusammenhang somit parallel zur Rotationsachse 8, während eine radiale Richtung senkrecht auf der Rotationsachse 8 steht und eine Umfangshchtung entlang einer Kreisbahn um die Rotationsachse 8 orientiert ist. Dementsprechend ist die Laufschaufel 7 axial zwischen den beiden Leitschaufeln 4 angeordnet. Der Statorhitzeschild 6 ist radial der Laufschaufel 7 gegenüber angeordnet und axial zwischen den beiden Leitschaufeln 4 positioniert.1, a gas turbine 1, of which only a small section is shown here, has a stator 2 and a rotor 3, which are likewise only partially shown. From the stator 2 guide vanes 4 are partially visible and a portion of a vane carrier 5. On the guide vane 5 are on the one hand the vanes 4 attached to the other stator stator 5 are also attached to the stator vane 5, one of which is recognizable here. From the rotor 3, only one blade 7 can be seen here, which is arranged between the two guide vanes 4. A dot-dash line indicates a rotation axis 8 about which the rotor 3 rotates during operation of the gas turbine 1 and which defines the axial direction of the gas turbine 1. Axial in the present context thus means parallel to the axis of rotation 8, while a radial direction is perpendicular to the axis of rotation 8 and a Umfangsrichtung is oriented along a circular path about the axis of rotation 8. Accordingly, the blade 7 is arranged axially between the two guide vanes 4. The stator heat shield 6 is disposed radially of the blade 7 and positioned axially between the two vanes 4.
Die einzelnen Statorhitzeschilde 6 bilden Segmente, die in der Umfangsrichtung zueinander benachbart angeordnet sind und einen geschlossenen Kreisring bilden, der eine Laufschaufel reihe umschließt, die durch in Umfangsrichtung zueinander benachbarte Laufschaufeln 7 gebildet ist. Der jeweilige Statorhitzeschild 6 trennt einen durch einen Pfeil angedeuteten Heißgaspfad 9 der Gasturbine 1 von einem ebenfalls durch einen Pfeil angedeuteten Kühlgaspfad 10, der im wesentlichen im Stator 2 verläuft.The individual Statorhitzeschilde 6 form segments which are arranged adjacent to each other in the circumferential direction and form a closed circular ring which encloses a blade row, which by in the circumferential direction adjacent blades 7 is formed. The respective stator heat shield 6 separates a hot gas path 9 of the gas turbine 1, indicated by an arrow, from a cooling gas path 10, likewise indicated by an arrow, which runs essentially in the stator 2.
Entsprechend den Fig. 1 und 2 besitzt der jeweilige Statorhitzeschild 6 eine Außenseite 11 , die im Einbauzustand dem Heißgaspfad 9 zugewandt ist. Ebenso weist der Statorhitzeschild 6 eine Innenseite 12 auf, die dem Kühlgaspfad 10 zugewandt ist beziehungsweise vom Heißgaspfad 9 und von der Außenseite 11 abgewandt ist. An seiner Innenseite 12 weist der Statorhitzeschild 6 mehrere Rippen 13 auf. Diese Rippen 13 erstrecken sich im Einbauzustand axial und sind vorzugsweise geradlinig ausgestaltet. Des weiteren sind die Rippen 13 in der Umfangshchtung zueinander beabstandet angeordnet. Ferner ist an der Innenseite 12 zumindest eine Prallplatte 14 angeordnet, die auf den Rippen 13 aufliegt. In dem in Fig. 2 gezeigten Beispiel erstreckt sich die Prallplatte 14 nur über eine Hälfte der Innenseite 12. Eine die andere Hälfte abdeckende zweite Prallplatte 14 ist hier zur besseren Erkennbarkeit der Rippen 13 weggelassen. Ebenso kann eine einzige Prallplatte 14 vorgesehen sein, die sämtliche Rippen 13 abdeckt.According to FIGS. 1 and 2, the respective stator heat shield 6 has an outer side 11, which faces the hot gas path 9 in the installed state. Likewise, the stator heat shield 6 has an inner side 12, which faces the cooling gas path 10 and is remote from the hot gas path 9 and from the outer side 11. On its inner side 12, the stator heat shield 6 has a plurality of ribs 13. These ribs 13 extend axially in the installed state and are preferably designed in a straight line. Furthermore, the ribs 13 are arranged spaced from one another in the circumferential direction. Furthermore, at least one baffle plate 14, which rests on the ribs 13, is arranged on the inner side 12. In the example shown in FIG. 2, the baffle plate 14 extends only over one half of the inner side 12. A second baffle plate 14 covering the other half is omitted here for better recognition of the ribs 13. Likewise, a single baffle plate 14 may be provided which covers all the ribs 13.
Der jeweilige Statorhitzeschild 6 weist außerdem in der Umfangshchtung zwei Stirnseiten 15 auf, die jeweils den Statorhitzeschild 6 in Umfangsrichtung begrenzen. In wenigstens eine dieser Stirnseiten 15 ist eine Nut 16 eingearbeitet. Vorzugsweise ist in beide Stirnseiten 15 jeweils eine derartige Nut 16 eingearbeitet. Im Einbauzustand grenzen zwei in Umfangsrichtung zueinander benachbarte Statorhitzeschilde 6 im Bereich dieser Stirnseiten 15 aneinander, wobei sich je zwei solche Stirnseiten 15 in einem in Fig. 3 angedeuteten Axialspalt 17 einander gegenüberliegen. Die Nuten 16 sind dabei so angeordnet, dass sie bei einander im Axialspalt 17 gegenüberliegenden Stirnseiten 15 zueinander fluchtend ausgerichtet sind. Die jeweilige Nut 16 dient zur Aufnahme wenigstens eines Dichtelements 18, das beispielsweise bandförmig oder streifenförmig ausgestaltet ist. Im Bereich des Axialspalts 17 greift ein derartiges Dichtelement 18 in zwei zueinander fluchtende Nuten 16 an zwei im Spalt 17 einander gegenüberliegenden Stirnseiten 15 gleichzeitig ein. Hierdurch kann das jeweilige Dichtelement 18 den Axialspalt 17 abdichten, also die dem Heißgaspfad 9 zugewandte Heißgasseite von der dem Kühlgaspfad 10 zugewandten Kühlgasseite trennen.The respective stator heat shield 6 also has, in the circumferential direction, two end faces 15, each delimiting the stator heat shield 6 in the circumferential direction. In at least one of these end faces 15, a groove 16 is incorporated. Preferably, in each case such a groove 16 is incorporated in both end faces 15. In the installed state, two stator heat shields 6 which are adjacent to one another in the circumferential direction adjoin one another in the region of these end faces 15, with two such end faces 15 facing each other in an axial gap 17 indicated in FIG. 3. The grooves 16 are arranged so that they are opposite each other in the axial gap 17 end faces 15th aligned with each other in alignment. The respective groove 16 serves to receive at least one sealing element 18, which is configured, for example, band-shaped or strip-shaped. In the region of the axial gap 17, such a sealing element 18 engages in two mutually aligned grooves 16 at two in the gap 17 opposite end faces 15 at the same time. In this way, the respective sealing element 18 can seal off the axial gap 17, ie separate the hot gas path 9 facing the hot gas path from the cooling gas side facing the cooling gas path 10.
Entsprechend den Fig. 2 und 3 ist der Statorhitzeschild 6 außerdem mit mehren Bohrungen 19 ausgestattet. Jede dieser Bohrungen 19 verbindet die Innenseite 12 einer der Stirnseiten 15. Dementsprechend mündet die jeweilige Bohrung 19 einenends an der Innenseite 12 und anderenends an der jeweiligen Stirnseite 15. Die Mündung der jeweiligen Bohrung 19 an der jeweiligen Stirnseite 15 ist beabstandet zur Nut 16 angeordnet, und zwar in Richtung zur Außenseite 11 hin. Auf diese Weise kann durch die Bohrungen 19 Kühlgas von der Kühlgasseite beziehungsweise vom Kühlgaspfad 10 auf die Heißgasseite des Spalts 17 gelangen, der zum Heißgaspfad 9 hin offen ist. Die einzelnen Bohrungen 19 sind gemäß Fig. 2 in axialer Richtung zueinander beabstandet an der jeweiligen Stirnseite 15 des Statorhitzeschilds 6 ausgebildet.According to FIGS. 2 and 3, the stator heat shield 6 is also equipped with a plurality of holes 19. Each of these holes 19 connects the inner side 12 of one of the end faces 15. Accordingly, the respective bore 19 opens at one end to the inner side 12 and the other end to the respective end face 15. The mouth of the respective bore 19 at the respective end face 15 is spaced from the groove 16, in the direction of the outside 11. In this way, through the bores 19, cooling gas can pass from the cooling gas side or from the cooling gas path 10 to the hot gas side of the gap 17, which is open toward the hot gas path 9. The individual bores 19 are, as shown in FIG. 2, spaced from one another in the axial direction on the respective end face 15 of the stator heat shield 6.
Entsprechend den Fig. 2 und 3 weist der Statorhitzeschild 6 an wenigstens einer der Stirnseiten 15 eine Ausnehmung 20 auf, die zur Außenseite 11 hin offen ist und die sich in axialer Richtung entlang der jeweiligen Seite 15 erstreckt. Beim hier gezeigten Beispiel ist die mit den Bohrungen 19 versehende Stirnseite 15 mit der Ausnehmung 20 ausgestattet. Dementsprechend erstreckt sich die Ausnehmung 20 entlang sämtlicher Bohrungen 19, so dass die Bohrungen 19 jeweils in der Ausnehmung 20 münden. Grundsätzlich kann es ausreichend sein, wenn bei zwei in Umfangshchtung benachbarten Statorhitzeschilden 6 nur eine der im Spalt 17 einander gegenüberliegenden Stirnseiten 15 mit Bohrungen 19 ausgestattet ist und nur eine dieser Stirnseiten 15 mit einer solchen Ausnehmung 20 ausgestattet ist. Zweckmäßig sind jedoch beide Stirnseiten 15 mit Bohrungen 19 und einer solchen Ausnehmung 20 versehen.According to FIGS. 2 and 3, the stator heat shield 6 has on at least one of the end faces 15 a recess 20 which is open toward the outside 11 and which extends in the axial direction along the respective side 15. In the example shown here, the front side 15 provided with the bores 19 is equipped with the recess 20. Accordingly, the recess 20 extends along all holes 19, so that the holes 19 each open in the recess 20. In principle, it may be sufficient if, in the case of two stator heat shields 6 adjacent in the circumferential direction, only one in the gap 17 opposite end faces 15 is provided with holes 19 and only one of these end faces 15 is equipped with such a recess 20. Appropriately, however, both end faces 15 are provided with holes 19 and such a recess 20.
Die Ausnehmungen 20 ermöglichen es dem Kühlgas auch dann durch die Bohrungen 19 in ausreichendem Maße auszutreten, wenn der Spalt 17 in Umfangsrichtung aufgrund von Relativbewegungen der benachbarten Statorhitzeschilde 6 vergleichsweise eng wird. Mit Hilfe der Bohrungen 19 kann im Betrieb der Gasturbine 1 eine Kühlung der Dichtelemente 18 bewirkt werden. Insbesondere lässt sich an der Heißgasseite der Dichtelemente 18 ein Kühlgasfilm erzeugen, der eine unmittelbare Heißgasbeaufschlagung der Dichtelemente 18 behindert. Gleichzeitig lassen sich die mit den Stirnseiten 15 versehenen umfangsmäßigen Endbereiche des jeweiligen Statorhitzeschilds 6 hierdurch effektiv kühlen, und zwar einerseits durch die Durchströmung dieser Endbereiche mit Kühlgas und andererseits durch die Ausbildung des Kühlgasfilms an den dem Heißgaspfad 9 ausgesetzten Bereichen der Stirnseite 15 und der Außenseite 11.The recesses 20 make it possible for the cooling gas to escape through the bores 19 to a sufficient extent, even if the gap 17 becomes comparatively narrow in the circumferential direction due to relative movements of the adjacent stator heat shields 6. With the help of the holes 19, a cooling of the sealing elements 18 can be effected during operation of the gas turbine 1. In particular, a cooling gas film can be produced on the hot gas side of the sealing elements 18, which obstructs direct hot gas loading of the sealing elements 18. At the same time, the peripheral end regions of the respective stator heat shield 6 provided with the end faces 15 can thereby effectively be cooled, on the one hand by the flow of these end regions with cooling gas and, on the other hand, by the formation of the cooling gas film on the areas of the front side 15 and the outside 11 exposed to the hot gas path 9 ,
Entsprechend den Fig. 2 und 3 ist an der Innenseite 12 zweckmäßig eine Vertiefung 21 ausgebildet. In dieser Vertiefung 21 sind die Rippen 13 angeordnet, und zwar so, dass innerhalb der Vertiefung 21 ein System von miteinander kommunizierenden Kanälen 22 entsteht. Die wenigstens eine Prallplatte 14 deckt dieses System aus Kanälen 22 zum Kühlgaspfad 10 hin ab. Innerhalb dieser Kanäle 22 kommt es zu einer konvektiven Wärmeübertragung zwischen dem jeweiligen Statorhitzeschild 6 und der jeweiligen Prallplatte 14. Gleichzeitig kann durch das mit den Kanälen 22 gebildete Kanalsystem eine Kühlgasströmung geführt werden. Beispielsweise weist dazu die jeweilige Prallplatte 14 eine Vielzahl von Durchtrittsöffnungen 23 auf, über die Kühlgas vom Kühlgaspfad 10 durch die Prallplatte 14 in die Kanäle 22 gelangen kann. Die zuvor genannten Bohrungen 19 münden nun an der Innenseite 12 in besagter Vertiefung 21 beziehungsweise in einem der Kanäle 22. Somit kann das durch die Durchtrittsöffnungen 23 in das Kanalsystem eintretende Kühlgas über die Bohrungen 19 wieder austreten und durch den Statorhitzeschild 6 hindurch zur Heißgasseite gelangen.According to FIGS. 2 and 3, a depression 21 is expediently formed on the inside 12. In this recess 21, the ribs 13 are arranged, in such a way that within the recess 21, a system of mutually communicating channels 22 is formed. The at least one baffle plate 14 covers this system from channels 22 to the cooling gas path 10 from. Within these channels 22 there is a convective heat transfer between the respective stator heat shield 6 and the respective baffle plate 14. At the same time, a cooling gas flow can be guided by the channel system formed with the channels 22. For example, for this purpose, the respective baffle plate 14 has a plurality of passage openings 23, via the cooling gas from the cooling gas path 10th can pass through the baffle plate 14 in the channels 22. The aforementioned holes 19 now open on the inner side 12 in said recess 21 or in one of the channels 22. Thus, the cooling gas entering the channel system through the passage openings 23 can exit via the holes 19 and pass through the stator heat shield 6 to the hot gas side.
An der Innenseite 12 sind hier mehrere Halterungen 24 ausgebildet, mit deren Hilfe die jeweilige Prallplatte 14 am Statorhitzeschild 6 festlegbar ist. Beispielsweise übergreifen hierzu die jeweiligen Halterungen 24 die jeweilige Plattplatte 14.On the inner side 12 a plurality of brackets 24 are formed here, with the aid of which the respective baffle plate 14 can be fixed to the stator heat shield 6. For example, the respective holders 24 overlap the respective flat plate 14 for this purpose.
Die Rippen 13 weisen jeweils eine bestimmte Rippenhöhe 25 auf, mit der sie sich in radialer Richtung erstrecken. Mit dieser Rippenhöhe 25 stehen die Rippen 13 hier von einem Boden der Vertiefung 21 ab. Des weiteren weisen die einzelnen Rippen 13 in der Umfangshchtung einen Rippenabstand 26 voneinander auf. Entsprechend einer vorteilhaften Ausführungsform sind die Rippenhöhe 25 und der Rippenabstand 26 so aufeinander abgestimmt, dass ein Verhältnis von Rippenhöhe 25 zu Rippenabstand 26 kleiner als 0,5 und vorzugsweise größer als 0,3 ist. Zweckmäßig liegt besagtes Verhältnis in einem Bereich von 0,328 bis 0,492.The ribs 13 each have a certain rib height 25, with which they extend in the radial direction. With this fin height 25, the ribs 13 are here from a bottom of the recess 21 from. Furthermore, the individual ribs 13 in the circumferential direction have a rib spacing 26 from one another. According to an advantageous embodiment, the fin height 25 and the fin spacing 26 are coordinated so that a ratio of fin height 25 to rib spacing 26 is less than 0.5 and preferably greater than 0.3. Suitably, said ratio is in the range of 0.328 to 0.492.
Auch die einzelnen Bohrungen 19 weisen in axialer Richtung einen gewissen Bohrungsabstand 27 zueinander auf. Ferner weist jede einzelne Bohrung einen bestimmten Bohrungsdurchmesser 28 auf. Auch hier kann bei einer besonderen Ausführungsform vorgesehen sein, den jeweiligen Bohrungsdurchmesser 28 und den Bohrungsabstand 27 so aufeinander abzustimmen, dass sich ein Verhältnis von Bohrungsdurchmesser 28 zu Bohrungsabstand 27 ergibt, das größer als 0,09 ist und das zweckmäßig kleiner als 0,15 ist. Vorzugsweise kann besagtes Verhältnis in einem Bereich von 0,0992 bis 0,1488 liegen. Also, the individual holes 19 have in the axial direction a certain bore spacing 27 to each other. Furthermore, each individual bore has a specific bore diameter 28. Again, it may be provided in a particular embodiment, the respective bore diameter 28 and the bore spacing 27 to match so that there is a ratio of bore diameter 28 to bore spacing 27, which is greater than 0.09 is and which is suitably less than 0.15. Preferably, said ratio may be in a range of 0.0992 to 0.1488.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
Gasturbinegas turbine
Statorstator
Rotorrotor
Leitschaufelvane
Leitschaufelträgerguide vane
Statorhitzeschildstator heat
Laufschaufelblade
Rotationsachseaxis of rotation
HeißgaspfadHot gas path
KühlgaspfadCooling gas path
Außenseiteoutside
Innenseiteinside
Ripperib
Prallplatteflapper
Stirnseitefront
Nutgroove
Axialspaltaxial gap
Dichtelementsealing element
Bohrungdrilling
Ausnehmungrecess
Vertiefungdeepening
Kanalchannel
Durchgangsöffnung HalterungThrough opening bracket
Rippenhöhefin height
Rippenabstandrib spacing
Bohrungsabstandhole spacing
Bohrungsdurchmesser Bore diameter

Claims

Patentansprüche claims
1. Statorhitzeschild für eine Gasturbine (1 ),1. Stator heat shield for a gas turbine (1),
- mit einer im Einbauzustand einem Heißgaspfad (9) der Gasturbine (1 ) zugewandten Außenseite (11 ),with an outer side (11) facing a hot gas path (9) of the gas turbine (1) in the installed state,
- mit einer von der Außenseite (11 ) abgewandten Innenseite (12),with an inner side (12) facing away from the outer side (11),
- mit mehreren an der Innenseite (12) ausgebildeten Rippen (13), die sich im Einbauzustand bezüglich einer Rotationsachse (8) eines Rotors (3) der Gasturbine (1 ) axial erstrecken und in Umfangsrichtung zueinander beabstandet sind,- With a plurality of on the inside (12) formed ribs (13) axially extending in the installed state with respect to a rotational axis (8) of a rotor (3) of the gas turbine (1) and are spaced from each other in the circumferential direction,
- mit wenigstens einer an der Innenseite (12) angeordneten Prallplatte (14), die auf den Rippen (13) aufliegt,- With at least one on the inside (12) arranged baffle plate (14) which rests on the ribs (13),
- mit wenigstens einer Nut (16), die in einer den Statorhitzeschild (6) im Umfangsrichtung begrenzenden Stirnseite (15) ausgebildet ist und in die wenigstens ein Dichtelement (18) einsetzbar ist,- With at least one groove (16) which is formed in a the stator heat shield (6) in the circumferential direction limiting end face (15) and in which at least one sealing element (18) can be inserted,
- mit mehreren Bohrungen (19), die jeweils einenends an der Stirnseite (15) von der Nut (16) in Richtung zur Außenseite (11 ) beabstandet und anderenends an der Innenseite (12) münden und die in axialer Richtung voneinander beabstandet sind.- With a plurality of holes (19) which at one end on the end face (15) from the groove (16) in the direction of the outer side (11) spaced and the other end on the inner side (12) open and which are spaced apart in the axial direction.
2. Statorhitzeschild nach Anspruch 1 , d a d u rc h g e ke n n ze i c h n et , dass an der Stirnseite (15) eine zur Nut (16) in Richtung zur Außenseite (11 ) hin beabstandete Ausnehmung (20) ausgebildet ist, die zur Außenseite (11 ) hin offen ist, die sich in axialer Richtung über die Bohrungen (19) der jeweiligen Stirnseite (15) erstreckt und in der die Bohrungen (19) münden.2. Statorhitzeschild according to claim 1, dadu rc hge ke nn ze zen et, that at the end face (15) to the groove (16) in the direction of the outer side (11) spaced towards recess (20) is formed, which to the outside (11 ) open is, which extends in the axial direction over the bores (19) of the respective end face (15) and in which the bores (19) open.
3. Statorhitzeschild nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass an der Innenseite (12) eine Vertiefung (21 ) ausgebildet ist, in der die Rippen (13) angeordnet sind und ein von der wenigstens einen Prallplatte (14) abgedecktes System miteinander kommunizierender Kanäle (22) bilden.3. Statorhitzeschild according to claim 1 or 2, characterized in that on the inside (12) has a recess (21) is formed in which the ribs (13) are arranged and one of the at least one baffle plate (14) covered system communicating with each other Form channels (22).
4. Statorhitzeschild nach Anspruch 3, dadurch gekennzeichnet, dass die Bohrungen (19) in der Vertiefung (21), insbesondere in einem der Kanäle (2), münden4. Statorhitzeschild according to claim 3, characterized in that the bores (19) in the recess (21), in particular in one of the channels (2), open
5. Statorhitzeschild nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die wenigstens eine Prallplatte (14) mehrere Durchtrittsöffnungen (23) aufweist.5. Statorhitzeschild according to one of claims 1 to 4, characterized in that the at least one baffle plate (14) has a plurality of passage openings (23).
6. Statorhitzeschild nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass an der Innenseite (12) zumindest eine Halterung (24) zum Festlegen der wenigstens einen Prallplatte (14) am Statorhitzeschild (6) ausgebildet ist.6. Statorhitzeschild according to one of claims 1 to 5, characterized in that on the inside (12) at least one holder (24) for fixing the at least one baffle plate (14) on the stator heat shield (6) is formed.
7. Statorhitzeschild nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass ein Verhältnis von Rippenhöhe (25) zu Rippenabstand (26) in einem Bereich von 0,41 ± 20% liegt. 7. Statorhitzeschild according to one of claims 1 to 6, characterized in that a ratio of fin height (25) to rib spacing (26) in a range of 0.41 ± 20%.
8. Statorhitzeschild nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass ein Verhältnis von Bohrungsdurchmesser (28) zu Bohrungsabstand (27) in einem Bereich von 0,124 ± 20% liegt.8. Statorhitzeschild according to one of claims 1 to 7, characterized in that a ratio of bore diameter (28) to hole spacing (27) in a range of 0.124 ± 20%.
9. Gasturbine mit wenigstens einem Statorhitzeschild (6) nach einem der Ansprüche 1 bis 8. 9. Gas turbine with at least one Statorhitzeschild (6) according to one of claims 1 to 8.
EP08735874A 2007-04-19 2008-04-07 Stator heat shield Active EP2137382B1 (en)

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US20100047062A1 (en) 2010-02-25
CA2684371C (en) 2014-10-21
EP2137382B1 (en) 2012-05-30
SI2137382T1 (en) 2012-10-30
MX2009011266A (en) 2009-11-02
CA2684371A1 (en) 2008-10-30
WO2008128876A1 (en) 2008-10-30
US7997856B2 (en) 2011-08-16

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