EP3113901A1 - Method for repairing an airfoil, and cooling collar - Google Patents

Method for repairing an airfoil, and cooling collar

Info

Publication number
EP3113901A1
EP3113901A1 EP15721613.6A EP15721613A EP3113901A1 EP 3113901 A1 EP3113901 A1 EP 3113901A1 EP 15721613 A EP15721613 A EP 15721613A EP 3113901 A1 EP3113901 A1 EP 3113901A1
Authority
EP
European Patent Office
Prior art keywords
cooling
airfoil
cooled
elements
welding
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Withdrawn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
EP15721613.6A
Other languages
German (de)
French (fr)
Inventor
Roman Kalocsay
Nikolai Arjakine
Georg Bostanjoglo
Bernd Burbaum
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
Publication of EP3113901A1 publication Critical patent/EP3113901A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00—Restoring or reconditioning objects
    • B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00—Restoring or reconditioning objects
    • B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
    • B23P6/007—Repairing turbine components, e.g. moving or stationary blades, rotors using only additive methods, e.g. build-up welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/34—Laser welding for purposes other than joining
    • B23K26/342—Build-up welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • B23K26/703—Cooling arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/005—Repairing methods or devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • 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
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/001—Turbines
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/80—Repairing, retrofitting or upgrading methods
    • 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
    • F05D2240/12—Fluid guiding means, e.g. vanes
    • F05D2240/125—Fluid guiding means, e.g. vanes related to the tip of a stator vane
    • 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
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/307—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the tip of a rotor blade

Definitions

  • the present invention relates to a process for Repara ⁇ structure of a blade of an axial flow turbomachine, in which on the blade by means of welding material kisstra ⁇ gene.
  • Blades of axial turbomachinery such as gas turbine blades
  • gas turbine blades are often subjected to very high temperatures and thermal stresses during operation.
  • Schaufelblät ⁇ ter made of high-strength materials, such as nickel-base superalloy.
  • blade wear due to oxidation, thermal fatigue cracking, metal erosion or the like can not be prevented. Accordingly, the blades must be serviced at regular intervals and replaced in case of wear or repaired.
  • a problem with known repair methods is that with the build-up welding heat is introduced into the blade to be repaired, whereby Sch healthyeigenspannun ⁇ conditions are caused in the component, which can lead to cracks among other things.
  • One way of counteracting such residual stresses is, for example, pre-heating the component prior to welding, thereby eliminating perspiration. Tensions are reduced by recovery during the welding process.
  • welding methods can be selected in which comparatively little heat is introduced into the substrate, for example laser deposition welding, to name but one example.
  • Another problem of known repair methods is that if several layers of material are to be applied to one another, the previously generated layer of material must first cool in order to keep the process conditions constant, which leads to long waiting times.
  • the present invention provides a method of the type mentioned, which is characterized in that the airfoil is cooled during the application welding.
  • a significant advantage of a sol ⁇ chen cooling during hardfacing is that the introduced by the welding process in the component heat is removed quickly, which leads to very constant Pro ⁇ zess petition.
  • waiting times can be avoided between welding see welding layers arranged one above the other.
  • sidewall regions of the airfoil are preferably cooled during build-up welding. Accordingly, a large-area and efficient cooling can be achieved.
  • the material is applied at least to the blade tip.
  • damage to the blade tip can be eliminated, which are due to a réellesbe ⁇ related contact of the blade tip with a stationary seal or a stationary housing.
  • Sidewall portions of the actor ⁇ felblattes are preferably formed during hardfacing adjacent to the blade tip cooled arranged. Accordingly ⁇ contract is obtained on the blade tip, a very efficient cooling during a material.
  • the material is applied in the inventive Ver ⁇ drive by means of micro-powder build-up welding advantageous, which is also known as Micro-cladding.
  • micro-powder build-up welding advantageous, which is also known as Micro-cladding.
  • a continuous stream of powder is melted on the substrate using a focused laser, in particular a fiber laser, whereby layer-wise coatings or also specific structures can be produced.
  • a significant advantage of micropulver application welding is that only a small amount of heat is introduced into the component, which is why there are hardly any stresses.
  • the realizable material application is very accurate, wes ⁇ half be connected to the material application only minor Nacharbei ⁇ th.
  • the present invention provides a cooling sleeve, which is particularly suitable for carrying out the method according to the invention.
  • the cooling sleeve comprises at least one cooling channel, which has a coolant inlet and a coolant outlet and flows through a coolant in the intended state, as well as several along ei ⁇ ner inner wall of the cooling sleeve and adjacent to the ⁇ least one cooling channel arranged cooling elements in be ⁇ mood condition to rest against an object to be cooled.
  • Such a cooling jacket may be arranged one object to be cooled on the order ⁇ fang and an effective cooling via cooled by the at least one cooling passage coolant flowing through cooling elements cause problems.
  • the cooling elements are movably held on the cooling sleeve. On In this way, an alignment of the cooling elements is made possible relative to an object to be cooled, whereby a good contact between the cooling elements and the object to be cooled and, accordingly, a good heat transfer can be ensured.
  • flexible sealing elements are arranged between the respective cooling elements, which allow a movement of the cooling elements. At the same time prevent the sealing elements, that exits through the cooling channel strö ⁇ ing coolant between the cooling elements.
  • the cooling elements are preferably made of a metallic work ⁇ material, in particular aluminum.
  • Metallic materials and in particular aluminum are characterized by their good thermal conductivity.
  • the arrangement, the number and the shape of the cooling elements are adapted to the outer contour of a blade ⁇ blade to be cooled, in particular to the outer contour of be ⁇ adjacent to the blade tip arranged side wall portions of the airfoil.
  • the cooling jacket ⁇ cuff is preferably designed for the cooling of side wall portions of an airfoil of a turbomachine, in particular for cooling a stator vane of a gas turbine.
  • the at least one cooling duct defining anddeele ⁇ housing receiving elements are provided.
  • the housing is preferably ver ⁇ see with a clamping device, which is designed such that it presses the cooling elements in the intended condition against the object to be cooled.
  • a clamping device which is designed such that it presses the cooling elements in the intended condition against the object to be cooled.
  • the cooling sleeve can be pushed onto an object to be cooled and then firmly fixed to this under Actu ⁇ tion of the clamping device.
  • the housing in the circumferential direction is divided into two the cooling channel dividing housing sections divided, which are connected by an elastic, a coolant passage defining connecting element mitein ⁇ other, wherein the tensioning means connects the free ends of the housing sections to each other.
  • FIG. 1 is a schematic sectional plan view of a cooling sleeve according to an embodiment of the present invention with reference to the accompanying drawings.
  • Cooling sleeve according to an embodiment of the present invention
  • FIG. 2 shows a partial view of the cooling sleeve shown in FIG. 5 in the direction of the arrow II in FIG. 1 and FIG
  • Figure 3 is a schematic perspective view of the in
  • Figure 1 illustrated cooling sleeve, which is arranged on a blade to be cooled airfoil.
  • the figures show a cooling collar 1 according to an exporting ⁇ approximate shape of the present invention.
  • the cooling sleeve 1 comprises an elongated, kidney-shaped housing 2 with opposing free housing ends 3 and 4.
  • a cooling channel 5 which at the one free housing end 3 with a coolant inlet 6 and at the other free housing end 4 is provided with adekar- telauslass 7.
  • the cooling sleeve 1 furthermore comprises a plurality of cooling elements 8 arranged along an inner wall of the cooling sleeve 1 and adjacent to the cooling channel 5, which in the intended condition bear against an airfoil 9 of a turbomachine, as will be described in more detail below is explained.
  • the cooling elements 8 are made of a metalli ⁇ rule material, in particular aluminum, wel ⁇ ches is characterized by its good thermal conductivity. Between the respective cooling elements 8 flexible sealing elements 10 are arranged, which on the one hand seal the intermediate spaces between the cooling elements 8, in order to prevent a coolant passed through the cooling channel 5 from exiting through these intermediate spaces. On the other hand, the sealing elements 10, which surround the cooling elements 8 circumferentially, give the cooling elements 8 a certain mobility.
  • the arrangement, the number and the shape of the cooling elements 8 are adapted to the outer contour of the airfoil 9 to be cooled, more precisely to the outer contour of adjacent to the blade tip 11 arranged side wall portions 12 of the Blade felblattes 9.
  • the housing 2 is in the circumferential direction approximately with ⁇ tig divided into two the cooling passage 5 dividing housing sections 2a, 2b, which are miteinan ⁇ connected via an elastic, ademit- tel filelass 13 defining connecting element 14. Thanks to the elasticity of the connecting element 14, the housing sections 2a and 2b can be moved within certain limits in the direction of the arrows A and B relative to each other.
  • the free housing ends 3 and 4 are interconnected by a clamping device 15.
  • the tensioning device 15 comprises a tensioning lever 16 and a spring 17 extending between the housing ends 3 and 4 and is designed in such a way that the housing ends 3 and 4, upon actuation of the tensioning lever 16, oppose each other against the force of the spring 17 and are supported by the force of the spring 17 can be moved away from each other.
  • the cooling sleeve 1 is used to cool the side wall portions 12 of an airfoil 9, while in the context of a repair process on the blade tip 11 of the blade ⁇ blade 9 by means of build-up welding material is applied.
  • the cooling sleeve 1 is mounted on the blade 9 in a first step.
  • the tensioning lever 16 of the tensioning device 15 is released so that the cooling cuff 1 can be slid onto the airfoil 9 from above.
  • the cooling sleeve 1 is positioned in such a way that the cooling elements 8 engage with the side wall regions 12 of the airfoil 9 arranged adjacent to the blade tip 11.
  • the clamping device 15 is tensioned under the operation of the clamping lever 16 against the force of the spring 17, as shown in Figure 3, so that the individual cooling elements 8 ge ⁇ conditions the opposite sections the side wall portions 12 of the airfoil 9 are pressed.
  • the cooling channel 5 is supplied with a coolant through the cooling medium inlet 6, which flows through the cooling channel 5 and exits through the coolant outlet 7 from the cooling ⁇ cuff 1 again.
  • the airfoil repair process is performed.
  • material is supported on the blade tip 11 of the airfoil 9 ⁇ by micro-powder build-up welding. The heat which is supplied to the airfoil 9 during the welding process is transferred from the side wall regions 12 of the airfoil 9 via the cooling elements 8 to the coolant flowing through the cooling channel 5 and removed.
  • a significant advantage of such cooling during hardfacing is that the process introduced by the welding in the component heat is asklei ⁇ tet faster, which leads to very constant process conditions. In addition, waiting times between the welding of superimposed weld layers can be avoided.
  • the cooling jacket 1 of the invention is characterized insbeson ⁇ particular by the fact that it has a simple, inexpensive and little space engaging structure. Accordingly, the cooling sleeve 1 can be easily transported and used flexibly. The implementation of a repair method of a still installed airfoil 9 in situ is possible using the cooling sleeve 1 according to the invention.
  • the repair process according to the invention is preferably carried out using micropulver deposition welding.
  • a significant advantage of the micro powder hardfacing be ⁇ is the fact that very little heat is introduced into the component that can be removed easily through the cooling collar, which is why hardly stresses occur.
  • the realizable material application is very accurate, which is why the material application only minor reworking subsequent ⁇ SEN.
  • the applied material may be a base material of the airfoil, a protective coating or the like. Suitable materials are well known to those skilled in the art, which is why will not be discussed in detail.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The invention relates to a method for repairing an airfoil (9) of an axial turbomachine in which material is deposited onto the airfoil (9) by means of deposition welding, and the airfoil (9) is cooled during the deposition welding. The invention further relates to a cooling collar (1) comprising at least one cooling channel (5) which has a coolant inlet (6) and a coolant outlet (7) and through which a coolant flows in the intended state. The cooling collar also comprises multiple cooling elements (8) which are arranged along an inner circumference of the cooling collar (1) and adjacently to the at least one cooling channel (5), said cooling elements resting against an object to be cooled, in particular an airfoil (9) to be cooled, in the intended state.

Description

VERFAHREN ZUR REPARATUR EINES SCHAUFELBLATTES SOWIE KÜHLMANSCHETTE  METHOD FOR REPAIRING A SHEAVE SHEET AND COOLING CHANNEL
Die vorliegende Erfindung betrifft ein Verfahren zur Repara¬ tur eines Schaufelblattes einer Axialturbomaschine, bei dem auf das Schaufelblatt mittels Aufschweißen Material aufgetra¬ gen wird. The present invention relates to a process for Repara ¬ structure of a blade of an axial flow turbomachine, in which on the blade by means of welding material aufgetra ¬ gene.
Schaufelblätter von Axialturbomaschinen, wie beispielsweise die Laufschaufeln von Gasturbinen, werden während des Betriebs häufig sehr hohen Temperaturen und starken thermischen Belastungen ausgesetzt. Aus diesem Grund werden Schaufelblät¬ ter aus hochfesten Materialen hergestellt, wie beispielsweise aus Nickelbasis-Superlegierung . Trotz solcher hochfesten Werkstoffe kann allerdings ein Verschleiß der Schaufelblätter in Folge von Oxidation, thermischer Ermüdungsrissbildung, Metallerosion oder dergleichen nicht verhindert werden. Entsprechend müssen die Schaufelblätter in regelmäßigen Abständen gewartet und im Falle eines Verschleißes ausgetauscht oder repariert werden. Blades of axial turbomachinery, such as gas turbine blades, are often subjected to very high temperatures and thermal stresses during operation. For this reason, Schaufelblät ¬ ter made of high-strength materials, such as nickel-base superalloy. However, despite such high strength materials, blade wear due to oxidation, thermal fatigue cracking, metal erosion or the like can not be prevented. Accordingly, the blades must be serviced at regular intervals and replaced in case of wear or repaired.
Zur Reparatur von Schaufelblättern existieren verschiedenste Reparaturverfahren bei denen Material auf verschlissene oder auf zuvor mechanisch abgetragene abgetragene Bereiche eines Schaufelblattes mittels Auftragsschweißen aufgetragen wird. Zum Einsatz kommen hier beispielsweise das Laserauftrags¬ schweißen und das Plasma-Pulverauftragsschweißen, um nur einige Beispiele zu nennen. Der aufgetragene Werkstoff kann dem ursprünglichen Werkstoff entsprechen. Alternativ kann aber auch ein anderes hochfestes Material aufgetragen werden. For the repair of airfoils there are a variety of repair methods in which material is applied to worn or previously mechanically abraded removed areas of an airfoil by build-up welding. Laser deposition welding and plasma powder coating welding, for example, are used here, for example. The applied material may be the same as the original material. Alternatively, however, another high-strength material can be applied.
Ein Problem bei bekannten Reparaturverfahren besteht darin, dass mit dem Auftragsschweißen Wärme in das zur reparierende Schaufelblatt eingebracht wird, wodurch Schweißeigenspannun¬ gen im Bauteil hervorgerufen werden, die unter anderem zu Rissen führen können. Eine Möglichkeit, solchen Schweißeigenspannungen zu begegnen, besteht beispielsweise darin, das Bauteil vor dem Schweißen vorzuwärmen, wodurch Schweißeigen- Spannungen durch Erholung während des Schweißprozesses verringert werden. Alternativ können Schweißverfahren gewählt werden, bei denen vergleichsweise wenig Wärme in das Substrat eingebracht wird, wie beispielsweise das Laserauftragsschwei- ßen, um nur ein Beispiel zu nennen. Ein weiteres Problem bekannter Reparaturverfahren besteht darin, dass, wenn mehrere Materialschichten übereinander aufgetragen werden sollen, die zuvor generierte Materialschicht erst abkühlen muss, um die Prozessbedingungen konstant zu halten, was mit langen Warte- zeiten einher geht. A problem with known repair methods is that with the build-up welding heat is introduced into the blade to be repaired, whereby Schweißeigenspannun ¬ conditions are caused in the component, which can lead to cracks among other things. One way of counteracting such residual stresses is, for example, pre-heating the component prior to welding, thereby eliminating perspiration. Tensions are reduced by recovery during the welding process. Alternatively, welding methods can be selected in which comparatively little heat is introduced into the substrate, for example laser deposition welding, to name but one example. Another problem of known repair methods is that if several layers of material are to be applied to one another, the previously generated layer of material must first cool in order to keep the process conditions constant, which leads to long waiting times.
Ausgehend von diesem Stand der Technik ist es eine Aufgabe der vorliegenden Erfindung, ein alternatives Verfahren zur Reparatur eines Schaufelblattes einer Axialturbomaschine der eingangs genannten Art zu schaffen. Based on this prior art, it is an object of the present invention to provide an alternative method for repairing an airfoil of an axial turbomachine of the type mentioned.
Zur Lösung dieser Aufgabe schafft die vorliegende Erfindung ein Verfahren der eingangs genannten Art, das dadurch gekennzeichnet ist, dass das Schaufelblatt während des Auftrags- Schweißens gekühlt wird. Ein wesentlicher Vorteil eines sol¬ chen Kühlens während des Auftragsschweißens besteht darin, dass die durch den Schweißprozess in das Bauteil eingebrachte Wärme schnell abgeleitet wird, was zu sehr konstanten Pro¬ zessbedingungen führt. Darüber hinaus können Wartezeiten zwi- sehen den Schweißen übereinander angeordneter Schweißlagen vermieden werden. To achieve this object, the present invention provides a method of the type mentioned, which is characterized in that the airfoil is cooled during the application welding. A significant advantage of a sol ¬ chen cooling during hardfacing is that the introduced by the welding process in the component heat is removed quickly, which leads to very constant Pro ¬ zessbedingungen. In addition, waiting times can be avoided between welding see welding layers arranged one above the other.
Bevorzugt werden bei dem erfindungsgemäßen Verfahren während des Auftragsschweißens Seitenwandbereiche des Schaufelblattes gekühlt. Entsprechend kann eine großflächige und effiziente Kühlung erzielt werden. In the method according to the invention, sidewall regions of the airfoil are preferably cooled during build-up welding. Accordingly, a large-area and efficient cooling can be achieved.
Gemäß einer Variante des erfindungsgemäßen Verfahrens wird das Material zumindest auf die Schaufelspitze aufgetragen. Auf diese Weise können beispielsweise Beschädigungen an der Schaufelspitze beseitigt werden, die auf einen betriebsbe¬ dingten Kontakt der Schaufelspitze mit einer stationären Dichtung oder einem stationären Gehäuse zurückzuführen sind. Bevorzugt werden während des Auftragsschweißens benachbarte zur Schaufelspitze angeordnete Seitenwandbereiche des Schau¬ felblattes gekühlt. Entsprechend wird während eines Material¬ auftrags auf die Schaufelspitze eine sehr effiziente Kühlung erzielt . According to a variant of the method according to the invention, the material is applied at least to the blade tip. In this way, for example, damage to the blade tip can be eliminated, which are due to a betriebsbe ¬ related contact of the blade tip with a stationary seal or a stationary housing. Sidewall portions of the actor ¬ felblattes are preferably formed during hardfacing adjacent to the blade tip cooled arranged. Accordingly ¬ contract is obtained on the blade tip, a very efficient cooling during a material.
Vorteilhaft wird das Material bei dem erfindungsgemäßen Ver¬ fahren mittels Mikropulverauftragsschweißen aufgetragen, das auch als Micro-Cladding bezeichnet wird. Bei diesem Verfahren wird ein kontinuierlicher Pulverstrom unter Verwendung eines fokussierten Lasers, insbesondere eines Faserlasers, auf dem Substrat aufgeschmolzen, wodurch schichtweise flächige Be- schichtungen oder auch gezielte Strukturen hergestellt werden können. Ein wesentlicher Vorteil des Mikropulverauftrags- schweißens besteht darin, dass nur wenig Wärme in das Bauteil eingebracht wird, weshalb kaum Spannungen auftreten. Darüber hinaus ist der realisierbare Materialauftrag sehr genau, wes¬ halb sich an den Materialauftrag nur geringfügige Nacharbei¬ ten anschließen. The material is applied in the inventive Ver ¬ drive by means of micro-powder build-up welding advantageous, which is also known as Micro-cladding. In this method, a continuous stream of powder is melted on the substrate using a focused laser, in particular a fiber laser, whereby layer-wise coatings or also specific structures can be produced. A significant advantage of micropulver application welding is that only a small amount of heat is introduced into the component, which is why there are hardly any stresses. In addition, the realizable material application is very accurate, wes ¬ half be connected to the material application only minor Nacharbei ¬ th.
Ferner schafft die vorliegende Erfindung eine Kühlmanschette, die insbesondere zur Durchführung des erfindungsgemäßen Verfahrens geeignet ist. Die Kühlmanschette umfasst zumindest einen Kühlkanal, der einen Kühlmitteleinlass und einen Kühl- mittelauslass aufweist und im bestimmungsgemäßen Zustand von einem Kühlmittel durchströmt wird, sowie mehrere entlang ei¬ ner Innenwandung der Kühlmanschette und benachbart zu dem zu¬ mindest einen Kühlkanal angeordnete Kühlelemente, die im be¬ stimmungsgemäßen Zustand an einem zu kühlenden Objekt anliegen. Eine derartige Kühlmanschette kann problemlos am Um¬ fang eines zu kühlenden Objektes angeordnet werden und eine effektive Kühlung über die durch das den zumindest einen Kühlkanal durchströmende Kühlmittel gekühlten Kühlelemente bewirken . Furthermore, the present invention provides a cooling sleeve, which is particularly suitable for carrying out the method according to the invention. The cooling sleeve comprises at least one cooling channel, which has a coolant inlet and a coolant outlet and flows through a coolant in the intended state, as well as several along ei ¬ ner inner wall of the cooling sleeve and adjacent to the ¬ least one cooling channel arranged cooling elements in be ¬ mood condition to rest against an object to be cooled. Such a cooling jacket may be arranged one object to be cooled on the order ¬ fang and an effective cooling via cooled by the at least one cooling passage coolant flowing through cooling elements cause problems.
Gemäß einer Ausgestaltung der vorliegenden Erfindung sind die Kühlelemente beweglich an der Kühlmanschette gehalten. Auf diese Weise wird eine Ausrichtung der Kühlelemente relativ zu einem zu kühlenden Objekt ermöglicht, wodurch ein guter Kontakt zwischen den Kühlelementen und dem zu kühlenden Objekt und dementsprechend ein guter Wärmeübergang gewährleistet werden kann. According to one embodiment of the present invention, the cooling elements are movably held on the cooling sleeve. On In this way, an alignment of the cooling elements is made possible relative to an object to be cooled, whereby a good contact between the cooling elements and the object to be cooled and, accordingly, a good heat transfer can be ensured.
Gemäß einer erfindungsgemäßen Variante sind zwischen den jeweiligen Kühlelementen flexible Dichtungselemente angeordnet, die eine Bewegung der Kühlelemente ermöglichen. Zugleich verhindern die Dichtelemente, dass das durch den Kühlkanal strö¬ mende Kühlmittel zwischen den Kühlelementen austritt. According to a variant of the invention flexible sealing elements are arranged between the respective cooling elements, which allow a movement of the cooling elements. At the same time prevent the sealing elements, that exits through the cooling channel strö ¬ ing coolant between the cooling elements.
Die Kühlelemente sind bevorzugt aus einem metallischen Werk¬ stoff hergestellt, insbesondere aus Aluminium. Metallische Werkstoffe und insbesondere Aluminium zeichnen sich durch ihre gute Wärmeleitfähigkeit aus. The cooling elements are preferably made of a metallic work ¬ material, in particular aluminum. Metallic materials and in particular aluminum are characterized by their good thermal conductivity.
Vorteilhaft sind die Anordnung, die Anzahl und die Form der Kühlelemente an die Außenkontur eines zu kühlenden Schaufel¬ blattes angepasst, insbesondere an die Außenkontur von be¬ nachbart zur Schaufelspitze angeordneten Seitenwandbereichen des Schaufelblattes. Mit anderen Worten ist die Kühlman¬ schette bevorzugt zur Kühlung von Seitenwandbereichen eines Schaufelblattes einer Turbomaschine ausgelegt, insbesondere zur Kühlung einer Leitschaufel einer Gasturbine. Advantageously, the arrangement, the number and the shape of the cooling elements are adapted to the outer contour of a blade ¬ blade to be cooled, in particular to the outer contour of be ¬ adjacent to the blade tip arranged side wall portions of the airfoil. In other words, the cooling jacket ¬ cuff is preferably designed for the cooling of side wall portions of an airfoil of a turbomachine, in particular for cooling a stator vane of a gas turbine.
Gemäß einer Ausgestaltung der vorliegenden Erfindung ist ein den zumindest ein Kühlkanal definierendes und die Kühlele¬ mente aufnehmendes Gehäuse vorgesehen. According to one embodiment of the present invention is a the at least one cooling duct defining and Kühlele ¬ housing receiving elements are provided.
Das Gehäuse ist bevorzugt mit einer Spanneinrichtung ver¬ sehen, die derart ausgebildet ist, dass sie die Kühlelemente im bestimmungsgemäßen Zustand gegen das zu kühlende Objekt drückt. Zum einen wird auf diese Weise ein guter Wärmeübergang zwischen den Kühlelementen und dem zu kühlenden Objekt gewährleistet. Zum anderen kann die Kühlmanschette auf ein zu kühlendes Objekt aufgeschoben und anschließend unter Betäti¬ gung der Spanneinrichtung fest an diesem fixiert werden. Gemäß einer Variante der vorliegenden Erfindung ist das Gehäuse in Umfangsrichtung in zwei den Kühlkanal unterteilende Gehäuseabschnitte unterteilt, die über ein elastisches, einen Kühlmitteldurchlass definierendes Verbindungselement mitein¬ ander verbunden sind, wobei die Spanneinrichtung freie Enden der Gehäuseabschnitte miteinander verbindet. The housing is preferably ver ¬ see with a clamping device, which is designed such that it presses the cooling elements in the intended condition against the object to be cooled. On the one hand, a good heat transfer between the cooling elements and the object to be cooled is ensured in this way. On the other hand, the cooling sleeve can be pushed onto an object to be cooled and then firmly fixed to this under Actu ¬ tion of the clamping device. According to a variant of the present invention, the housing in the circumferential direction is divided into two the cooling channel dividing housing sections divided, which are connected by an elastic, a coolant passage defining connecting element mitein ¬ other, wherein the tensioning means connects the free ends of the housing sections to each other.
Weitere Merkmale und Vorteile der vorliegenden Erfindung wer- den anhand der nachfolgenden Beschreibung einer Kühlmanschette gemäß einer Ausführungsform der vorliegenden Erfindung unter Bezugnahme auf die beiliegende Zeichnung deutlich. Darin ist Figur 1 eine schematische geschnittene Draufsicht einer Further features and advantages of the present invention will become apparent from the following description of a cooling sleeve according to an embodiment of the present invention with reference to the accompanying drawings. 1 is a schematic sectional plan view of a
Kühlmanschette gemäß einer Ausführungsform der vorliegenden Erfindung;  Cooling sleeve according to an embodiment of the present invention;
Figur 2 eine Teilansicht der in Figur5 1 gezeigten Kühlman- schette in Richtung des Pfeils II in Figur 1 und FIG. 2 shows a partial view of the cooling sleeve shown in FIG. 5 in the direction of the arrow II in FIG. 1 and FIG
Figur 3 eine schematische perspektivische Ansicht der in Figure 3 is a schematic perspective view of the in
Figur 1 dargestellten Kühlmanschette, die an einem zu kühlenden Schaufelblatt angeordnet ist.  Figure 1 illustrated cooling sleeve, which is arranged on a blade to be cooled airfoil.
Die Figuren zeigen eine Kühlmanschette 1 gemäß einer Ausfüh¬ rungsform der vorliegenden Erfindung. Die Kühlmanschette 1 umfasst ein längliches, sich nierenartig erstreckendes Ge- häuse 2 mit einander gegenüberliegenden freien Gehäuseenden 3 und 4. In dem Gehäuse 2 erstreckt sich ein Kühlkanal 5, der an dem einen freien Gehäuseende 3 mit einem Kühlmitteleinlass 6 und an dem anderen freien Gehäuseende 4 mit einem Kühlmit- telauslass 7 versehen ist. Die Kühlmanschette 1 umfasst fer- ner mehrere entlang einer Innenwandung der Kühlmanschette 1 und angrenzend an den Kühlkanal 5 angeordnete Kühlelemente 8, die im bestimmungsgemäßen Zustand an einem Schaufelblatt 9 einer Turbomaschine anliegen, wie es nachfolgend noch näher erläutert wird. Die Kühlelemente 8 sind aus einem metalli¬ schen Werkstoff hergestellt, insbesondere aus Aluminium, wel¬ ches sich durch seine gute Wärmeleitfähigkeit auszeichnet. Zwischen den jeweiligen Kühlelementen 8 sind flexible Dich- tungselemente 10 angeordnet, die einerseits die Zwischenräume zwischen den Kühlelementen 8 abdichten, um zu verhindern, dass ein durch den Kühlkanal 5 geleitetes Kühlmittel durch diese Zwischenräume austritt. Andererseits verleihen die Dichtungselemente 10, welche die Kühlelemente 8 umfänglich umgeben, den Kühlelementen 8 eine gewisse Beweglichkeit. Die Anordnung, die Anzahl und die Form der Kühlelemente 8 sind an die Außenkontur des zu kühlenden Schaufelblattes 9 angepasst, genauer gesagt an die Außenkontur von benachbart zur Schaufelspitze 11 angeordneten Seitenwandbereichen 12 des Schau- felblattes 9. Das Gehäuse 2 ist in Umfangsrichtung etwa mit¬ tig in zwei den Kühlkanal 5 unterteilende Gehäuseabschnitte 2a, 2b unterteilt, die über ein elastisches, einen Kühlmit- teldurchlass 13 definierendes Verbindungselement 14 miteinan¬ der verbunden sind. Dank der Elastizität des Verbindungsele- mentes 14 können die Gehäuseabschnitte 2a und 2b in gewissen Grenzen in Richtung der Pfeile A und B relativ zueinander bewegt werden. Die freien Gehäuseenden 3 und 4 sind durch eine Spanneinrichtung 15 miteinander verbunden. Die Spanneinrichtung 15 umfasst einen Spannhebel 16 und eine sich zwischen den Gehäuseenden 3 und 4 erstreckende Feder 17 und ist derart ausgebildet, dass die Gehäuseenden 3 und 4 bei Betätigung des Spannhebels 16 gegen die Kraft der Feder 17 aufeinander zu und unterstützt von der Kraft der Feder 17 voneinander weg bewegt werden können. The figures show a cooling collar 1 according to an exporting ¬ approximate shape of the present invention. The cooling sleeve 1 comprises an elongated, kidney-shaped housing 2 with opposing free housing ends 3 and 4. In the housing 2 extends a cooling channel 5, which at the one free housing end 3 with a coolant inlet 6 and at the other free housing end 4 is provided with a Kühlmittel- telauslass 7. The cooling sleeve 1 furthermore comprises a plurality of cooling elements 8 arranged along an inner wall of the cooling sleeve 1 and adjacent to the cooling channel 5, which in the intended condition bear against an airfoil 9 of a turbomachine, as will be described in more detail below is explained. The cooling elements 8 are made of a metalli ¬ rule material, in particular aluminum, wel ¬ ches is characterized by its good thermal conductivity. Between the respective cooling elements 8 flexible sealing elements 10 are arranged, which on the one hand seal the intermediate spaces between the cooling elements 8, in order to prevent a coolant passed through the cooling channel 5 from exiting through these intermediate spaces. On the other hand, the sealing elements 10, which surround the cooling elements 8 circumferentially, give the cooling elements 8 a certain mobility. The arrangement, the number and the shape of the cooling elements 8 are adapted to the outer contour of the airfoil 9 to be cooled, more precisely to the outer contour of adjacent to the blade tip 11 arranged side wall portions 12 of the Blade felblattes 9. The housing 2 is in the circumferential direction approximately with ¬ tig divided into two the cooling passage 5 dividing housing sections 2a, 2b, which are miteinan ¬ connected via an elastic, a Kühlmit- teldurchlass 13 defining connecting element 14. Thanks to the elasticity of the connecting element 14, the housing sections 2a and 2b can be moved within certain limits in the direction of the arrows A and B relative to each other. The free housing ends 3 and 4 are interconnected by a clamping device 15. The tensioning device 15 comprises a tensioning lever 16 and a spring 17 extending between the housing ends 3 and 4 and is designed in such a way that the housing ends 3 and 4, upon actuation of the tensioning lever 16, oppose each other against the force of the spring 17 and are supported by the force of the spring 17 can be moved away from each other.
Die Kühlmanschette 1 dient dazu, die Seitenwandbereiche 12 eines Schaufelblattes 9 zu kühlen, während im Rahmen eines Reparaturverfahrens auf die Schaufelspitze 11 des Schaufel¬ blattes 9 mittels Auftragsschweißen Material aufgetragen wird. The cooling sleeve 1 is used to cool the side wall portions 12 of an airfoil 9, while in the context of a repair process on the blade tip 11 of the blade ¬ blade 9 by means of build-up welding material is applied.
Zur Durchführung des Verfahrens wird die Kühlmanschette 1 in einem ersten Schritt an dem Schaufelblatt 9 montiert. Hierzu wird der Spannhebel 16 der Spanneinrichtung 15 gelöst, so dass die Kühlmanschette 1 von oben auf das Schaufelblatt 9 aufgeschoben werden kann. Die Kühlmanschette 1 wird dabei derart positioniert, dass die Kühlelemente 8 mit den benach- bart zur Schaufelspitze 11 angeordneten Seitenwandbereichen 12 des Schaufelblattes 9 in Eingriff kommen. Sobald die Kühl¬ manschette 1 an ihrer bestimmungsgemäßen Position angeordnet ist, wird die Spanneinrichtung 15 unter Betätigung des Spannhebels 16 entgegen der Kraft der Feder 17 gespannt, wie es in Figur 3 gezeigt ist, so dass die einzelnen Kühlelemente 8 ge¬ gen die gegenüberliegenden Abschnitte der Seitenwandbereiche 12 des Schaufelblattes 9 gedrückt werden. Dank der Flexibili¬ tät der die Kühlelemente 8 einfasssenden Dichtungselemente werden die Kühlelemente 8 im Rahmen dieses Spannvorgangs au- tomatisch optimal in Bezug auf die Außenkontur der Seitenwandbereiche 12 ausgerichtet, wodurch ein guter Wärmeübergang zwischen dem Schaufelblatt 9 und den Kühlelementen 8 gewährleistet wird. In einem weiteren Schritt wird dem Kühlkanal 5 über den Kühl- mitteleinlass 6 ein Kühlmittel zugeführt, das den Kühlkanal 5 durchströmt und durch den Kühlmittelauslass 7 aus der Kühl¬ manschette 1 wieder austritt. Nunmehr wird das Schaufelblattreparaturverfahren durchgeführt. Hierbei wird mittels Mikropulverauftragsschweißen Material auf die Schaufelspitze 11 des Schaufelblattes 9 auf¬ getragen. Die Wärme, die dem Schaufelblatt 9 während des Schweißprozesses zugeführt wird, wird von den Seitenwandbe- reichen 12 des Schaufelblattes 9 über die Kühlelemente 8 an das durch den Kühlkanal 5 strömende Kühlmittel übertragen und abgeführt . To carry out the method, the cooling sleeve 1 is mounted on the blade 9 in a first step. For this the tensioning lever 16 of the tensioning device 15 is released so that the cooling cuff 1 can be slid onto the airfoil 9 from above. The cooling sleeve 1 is positioned in such a way that the cooling elements 8 engage with the side wall regions 12 of the airfoil 9 arranged adjacent to the blade tip 11. Once the cooling ¬ cuff 1 is arranged at its intended position, the clamping device 15 is tensioned under the operation of the clamping lever 16 against the force of the spring 17, as shown in Figure 3, so that the individual cooling elements 8 ge ¬ conditions the opposite sections the side wall portions 12 of the airfoil 9 are pressed. Thanks to the flexibil ¬ ty of the cooling elements 8 einfasssenden sealing elements 8 as part of this clamping operation auto- matically optimal with respect to the outer contour of the side wall portions aligned the cooling elements 12, whereby a good heat transfer between the blade 9 and the cooling elements is ensured. 8 In a further step, the cooling channel 5 is supplied with a coolant through the cooling medium inlet 6, which flows through the cooling channel 5 and exits through the coolant outlet 7 from the cooling ¬ cuff 1 again. Now, the airfoil repair process is performed. Here material is supported on the blade tip 11 of the airfoil 9 ¬ by micro-powder build-up welding. The heat which is supplied to the airfoil 9 during the welding process is transferred from the side wall regions 12 of the airfoil 9 via the cooling elements 8 to the coolant flowing through the cooling channel 5 and removed.
Ein wesentlicher Vorteil eines solchen Kühlens während des Auftragsschweißens besteht darin, dass die durch den Schweiß- prozess in das Bauteil eingebrachte Wärme schneller abgelei¬ tet wird, was zu sehr konstanten Prozessbedingungen führt. Darüber hinaus können Wartezeiten zwischen dem Schweißen übereinander angeordneter Schweißlagen vermieden werden. A significant advantage of such cooling during hardfacing is that the process introduced by the welding in the component heat is abgelei ¬ tet faster, which leads to very constant process conditions. In addition, waiting times between the welding of superimposed weld layers can be avoided.
Die erfindungsgemäße Kühlmanschette 1 zeichnet sich insbeson¬ dere dadurch aus, dass diese einen einfachen, preiswerten und wenig Bauraum einnehmenden Aufbau aufweist. Entsprechend kann die Kühlmanschette 1 problemlos transportiert und flexibel eingesetzt werden. Auch die Durchführung eines Reparaturverfahrens eines noch eingebauten Schaufelblattes 9 in situ ist unter Verwendung der erfindungsgemäßen Kühlmanschette 1 möglich. The cooling jacket 1 of the invention is characterized insbeson ¬ particular by the fact that it has a simple, inexpensive and little space engaging structure. Accordingly, the cooling sleeve 1 can be easily transported and used flexibly. The implementation of a repair method of a still installed airfoil 9 in situ is possible using the cooling sleeve 1 according to the invention.
Das erfindungsgemäße Reparaturverfahren wird bevorzugt unter Einsatz des Mikropulverauftragsschweißens durchgeführt. Ein wesentlicher Vorteil des Mikropulverauftragsschweißens be¬ steht darin, dass nur wenig Wärme in das Bauteil eingebracht wird, die über die Kühlmanschette problemlos abgeführt werden kann, weshalb kaum Spannungen auftreten. Darüber hinaus ist der realisierbare Materialauftrag sehr genau, weshalb sich an den Materialauftrag nur geringfügige Nacharbeiten anschlie¬ ßen . The repair process according to the invention is preferably carried out using micropulver deposition welding. A significant advantage of the micro powder hardfacing be ¬ is the fact that very little heat is introduced into the component that can be removed easily through the cooling collar, which is why hardly stresses occur. In addition, the realizable material application is very accurate, which is why the material application only minor reworking subsequent ¬ SEN.
Für den Materialauftrag können unterschiedlichste Materialien gewählt werden. So kann es sich bei dem aufgetragenen Material beispielsweise um ein Basismaterial des Schaufelblattes, um eine Schutzbeschichtung oder dergleichen handeln. Geeignete Materialen sin dem Fachmann hinlänglich bekannt, weshalb hierauf nicht näher eingegangen wird. For the material application a wide variety of materials can be selected. For example, the applied material may be a base material of the airfoil, a protective coating or the like. Suitable materials are well known to those skilled in the art, which is why will not be discussed in detail.
Obwohl die Erfindung im Detail durch das bevorzugte Ausführungsbeispiel näher illustriert und beschrieben wurde, so ist die Erfindung nicht durch die offenbarten Beispiele einge¬ schränkt und andere Variationen können vom Fachmann hieraus abgeleitet werden, ohne den Schutzumfang der Erfindung zu verlassen . Although the invention in detail by the preferred embodiment has been illustrated and described in detail, the invention is not limited ¬ by the disclosed examples and other variations can be derived therefrom by the skilled artisan without departing from the scope of the invention.

Claims

Patentansprüche claims
1. Verfahren zur Reparatur eines Schaufelblattes (9) einer Axialturbomaschine, bei dem auf das Schaufelblatt (9) mittels Auftragsschweißen Material aufgetragen wird, dadurch gekennzeichnet, dass 1. A method for repairing an airfoil (9) of an axial turbomachine in which material is applied to the airfoil (9) by means of build-up welding, characterized in that
das Schaufelblatt (9) während des Auftragsschweißens ge kühlt wird.  the airfoil (9) is cooled during buildup welding.
2. Verfahren nach Anspruch 1, 2. The method according to claim 1,
dadurch gekennzeichnet, dass  characterized in that
während des Auftragsschweißens Seitenwandbereiche (12) des Schaufelblattes (9) gekühlt werden.  side walls (12) of the airfoil (9) are cooled during the build-up welding.
3. Verfahren nach Anspruch 1 oder 2, 3. The method according to claim 1 or 2,
dadurch gekennzeichnet, dass  characterized in that
Material zumindest auf die Schaufelspitze (11) aufgetra gen wird.  Material at least on the blade tip (11) aufgetra conditions.
4. Verfahren nach Anspruch 3, 4. The method according to claim 3,
dadurch gekennzeichnet, dass  characterized in that
während des Auftragsschweißens benachbart zur Schaufel¬ spitze (11) angeordnete Seitenwandbereiche (12) des Schaufelblattes gekühlt werden. during the hardfacing adjacent to the blade tip ¬ (11) arranged side wall portions (12) of the airfoil are cooled.
5. Verfahren nach einem der vorhergehenden Ansprüche, 5. Method according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
das Material mittels Mikropulverauftragsschweißen aufge tragen wird.  the material is carried up by micropulver deposition welding.
Kühlmanschette (1) mit zumindest einem Kühlkanal (5), der einen Kühlmitteleinlass (6) und einen Kühlmittelaus lass (7) aufweist und im bestimmungsgemäßen Zustand von einem Kühlmittel durchströmt wird, Cooling collar (1) with at least one cooling channel (5), which has a coolant inlet (6) and a Kühlmittelaus lass (7) and is flowed through in the intended condition of a coolant,
und mehreren entlang einer Innenwandung der Kühlmanschette (1) und angrenzend an den zumindest einen Kühl¬ kanal (5) angeordneten Kühlelementen (8), and more along an inner wall of the cooling jacket (1) and disposed adjacent to the at least one cooling channel ¬ (5) cooling means (8),
die im bestimmungsgemäßen Zustand an einem zu kühlenden Objekt anliegen.  which rest in the intended condition on an object to be cooled.
Kühlmanschette (1) nach Anspruch 6, Cooling collar (1) according to claim 6,
dadurch gekennzeichnet, dass  characterized in that
die Kühlelemente (8) beweglich gehalten sind.  the cooling elements (8) are movably held.
8. Kühlmanschette (1) nach Anspruch 7, 8. cooling sleeve (1) according to claim 7,
dadurch gekennzeichnet, dass  characterized in that
zwischen den jeweiligen Kühlelementen (8) flexible Dichtungselemente angeordnet sind, die eine Bewegung der Kühlelemente ermöglichen.  between the respective cooling elements (8) flexible sealing elements are arranged, which allow a movement of the cooling elements.
9. Kühlmanschette (1) nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass 9. cooling sleeve (1) according to one of claims 6 to 8, characterized in that
die Kühlelemente (8) aus einem metallischen Werkstoff hergestellt sind,  the cooling elements (8) are made of a metallic material,
insbesondere aus Aluminium.  in particular of aluminum.
10. Kühlmanschette (1) nach einem der Ansprüche 6 bis10. cooling sleeve (1) according to one of claims 6 to
9, 9
dadurch gekennzeichnet, dass  characterized in that
die Anordnung, die Anzahl und die Form der Kühlelemente the arrangement, the number and the shape of the cooling elements
(8) an die Außenkontur eines zu kühlenden Schaufelblat¬ tes (9) angepasst sind, (8) are adapted to the outer contour of a blade leaf to be cooled ¬ tes (9),
insbesondere an die Außenkontur von benachbart zur  in particular to the outer contour of adjacent to
Schaufelspitze (11) angeordneten Seitenwandbereichen Blade tip (11) arranged side wall portions
11. Kühlmanschette (1) nach einem der Ansprüche 6 bis11. Cooling sleeve (1) according to one of claims 6 to
10, 10
dadurch gekennzeichnet, dass  characterized in that
ein den zumindest einen Kühlkanal (5) definierendes und die Kühlelemente (8) aufnehmendes Gehäuse (2) vorgesehen ist .  a housing (2) defining the at least one cooling channel (5) and housing the cooling elements (8) is provided.
12. Kühlmanschette (1) nach Anspruch 11, 12. Cooling sleeve (1) according to claim 11,
dadurch gekennzeichnet, dass  characterized in that
das Gehäuse (2) mit einer Spanneinrichtung (15) versehen ist,  the housing (2) is provided with a tensioning device (15),
die derart ausgebildet ist,  which is designed in such a way
dass sie die Kühlelemente (8) im bestimmungsgemäßen Zu¬ stand gegen das zu kühlendes Objekt drückt. that it presses the cooling elements (8) in the intended state to ¬ against the object to be cooled.
13. Kühlmanschette (1) nach Anspruch 12, 13. cooling sleeve (1) according to claim 12,
dadurch gekennzeichnet, dass  characterized in that
das Gehäuse (2) in Umfangsrichtung in zwei den Kühlkanal (5) unterteilende Gehäuseabschnitte (2a, 2b) unterteil ist, die über ein elastisches, einen Kühlmitteldurchlass (13) definierendes Verbindungselement (14) miteinander verbunden sind, und  the housing (2) in the circumferential direction in two the cooling channel (5) dividing housing sections (2a, 2b) is lower part, which are connected to each other via an elastic, a coolant passage (13) defining the connecting element (14), and
dass die Spanneinrichtung (15) an freie Enden der  that the tensioning device (15) at free ends of
Gehäuseabschnitte (2a, 2b) miteinander verbindet.  Casing sections (2a, 2b) connects to each other.
EP15721613.6A 2014-05-23 2015-04-28 Method for repairing an airfoil, and cooling collar Withdrawn EP3113901A1 (en)

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