EP0223194B1 - Variable guide vane for a turbo machine - Google Patents

Variable guide vane for a turbo machine Download PDF

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Publication number
EP0223194B1
EP0223194B1 EP86115712A EP86115712A EP0223194B1 EP 0223194 B1 EP0223194 B1 EP 0223194B1 EP 86115712 A EP86115712 A EP 86115712A EP 86115712 A EP86115712 A EP 86115712A EP 0223194 B1 EP0223194 B1 EP 0223194B1
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EP
European Patent Office
Prior art keywords
guide vane
blade
blade part
pivotable
vane according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86115712A
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German (de)
French (fr)
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EP0223194A1 (en
Inventor
Hagen Hanser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MTU Aero Engines GmbH
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MTU Motoren und Turbinen Union Muenchen GmbH
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Publication of EP0223194A1 publication Critical patent/EP0223194A1/en
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Publication of EP0223194B1 publication Critical patent/EP0223194B1/en
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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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/162—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line
    • 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
    • F01D5/14—Form or construction
    • F01D5/148—Blades with variable camber, e.g. by ejection of fluid

Definitions

  • the invention relates to a guide vane for turbomachines, in particular for gas turbines, with a vane part which is fixed on the inlet side and a vane part which is pivotable relative to the latter, the separation between the fixed and the pivotable vane part being in the region of the greatest vane thickness.
  • a blade of the aforementioned type is known from JP-A 5 893 903.
  • the pivotable vane part is articulated on the fixed vane part via two bolt hinges which are arranged within the vane surface contour.
  • the hinge gap is covered on one side by a deformable metal plate, on the other side by a flexible cover.
  • a disadvantage of the aforementioned blade construction is that only small swivel angles can be permitted due to the swivel axis on the inside if the surfaces of the two cover plates are to remain continuously curved.
  • Another disadvantage is that the arrangement of two pivot hinges inside the blade is structurally complex.
  • a guide vane of the type described at the outset is also known from US Pat. No. 3,237,918. With this guide vane, too, the pivot axis lies approximately in the middle between the two vane surfaces.
  • the blade surface in this previously known guide blade has a double-walled design over a considerable area. This design and the arrangement of the pivot hinge in the interior of the blade, as in the first described blade from the prior art, require a comparatively large amount of construction.
  • the object of the present invention is to create a guide vane of the type described in the introduction, which has a surface that is as continuous as possible, but at least a surface that is free of gaps and wrinkles at different pivoting angles, the simplest means of construction being sufficient, and high operational reliability.
  • the object is achieved in that, in the case of a blade of the type described in the introduction, the pivotable blade part is connected to the fixed blade part by means of a hinge which lies in the outer boundary line (outer contour) of the guide blade, this hinge being formed by an elastic band is attached to both blade parts and covers the joint gap between these parts.
  • the joint gap on the side opposite the hinge is covered by a flexible band which is fastened only to one of the two blade parts.
  • the fastening of the elastic band to the vane parts be an adhesive, riveted or welded connection.
  • the flexible band should preferably consist of a fluoropolymer plastic.
  • the elastic band can consist of a fiber-reinforced plastic.
  • an adjusting member for the pivotable blade part is designed as a cylindrical bolt which is mounted coaxially to the pivot axis of the hinge and is recessed substantially flush with the outer contour of this blade part in the region of its attachment to the pivotable blade part.
  • the bearing of the adjusting member can be a conventional pivot or pivot bearing.
  • the adjustment member is mounted on one side in a circumferential ring, preferably the outer ring of the turbomachine housing.
  • the guide vane 1 has a fixed vane part 2 and a pivotable vane part 3 with a separation between the two in the area of the greatest vane thickness, the vane part 2 having arch contours 5 in the area of the separation, for an adjustment element when pivoted according to the bow arrow shown in FIG. 1 4 not to hinder.
  • the joint gap designated 8 between the two blade parts 2, 3 is on one side by an elastic band 6 be covers, which is fixed on both sides over the height of the blade on the one hand on the fixed blade part 2, on the other hand on the pivotable blade part 3.
  • the joint gap 8 is covered by a flexible band 7, which is fastened on one side over the length of the vane to the vane part 2, while its other side rests on the surface of the vane part 3.
  • the blade part 3 is pivoted relative to the fixed blade part 2 by means of the adjusting member 4, which is inserted and held in the blade part 3 via a dovetail guide.
  • the elastic band 6 serves as a pivot hinge with the pivot axis HA.
  • the adjusting member 4 is designed as a cylindrical bolt, which is mounted in the pivot axis HA in a bearing bush 11 in a bearing eye 22 of an outer ring 10 of the turbomachine housing.
  • a pivot lever 13 is fastened in a torsionally rigid manner and can be actuated via a joint piece 14 and an adjusting ring 15.
  • the cylindrical bolt forming the adjusting member 4 is recessed in such a way that it runs flush with the outer contour of the blade part 3.
  • the bolt is flattened at 12 so that at the maximum pivoting angle of the blade part 3 with respect to the fixed blade part 2, the bolt does not protrude beyond the outer contour of the blade.
  • Suitable materials for the flexible tape are 6 foils made of fluorocarbons such as FEB or PTFE.
  • fluorocarbons such as FEB or PTFE.
  • synthetic resins in particular polymer plastics including polyimide, can also be used.
  • the elastic band 6 can consist of an elastomer or a plastic, such as silicone rubber. Fiber-reinforced plastics made of elastomers or rubber-like plastics are particularly suitable. Fabric inserts, in particular carbon, glass fiber or metal thread fabrics, are suitable depending on the intended use and operating temperature.
  • Elastic in the sense of the invention is understood to mean a body that essentially behaves according to Hooke's law, that is to say resiliently returns to its starting position after a deflection as a result of the action of force.
  • flexible is understood to mean a body that is bendable, but not elastic or only very limited elastic, i.e. has resilient properties.
  • the components of the guide vane are provided with the same reference numerals as in FIGS. 1 to 3.
  • the adjusting member 4 with its flattened side surfaces 12 is shown in FIG. 4 and 12b and its cylindrical outer contour 12a.
  • Both the flexible band 7 and the elastic band 6 are hatched.
  • the elastic band 6 is in each case permanently connected to the blade part 2 or 3 at the points 6 ′ and 6 ′′.
  • the loose side of the flexible band 7 is designated 7 ′′, where it lies on the surface of the pivotable blade part 3 loosely rests, while the other side 7 'of the band 7 is attached to the fixed blade part 2.

Description

Die Erfindung bezieht sich auf eine Leitschaufel für Turbomaschinen, insbesondere für Gasturbinen, mit einem eintrittsseitig feststehenden Schaufelteil und einem diesem gegenüber schwenkbaren austrittsseitigen Schaufelteil, wobei sich die Trennung zwischen dem feststehenden und dem schwenkbaren Schaufelteil im Bereich der größten Schaufeldicke befindet.The invention relates to a guide vane for turbomachines, in particular for gas turbines, with a vane part which is fixed on the inlet side and a vane part which is pivotable relative to the latter, the separation between the fixed and the pivotable vane part being in the region of the greatest vane thickness.

Eine Schaufel der vorbezeichneten Art ist aus der Druckschrift JP-A 5 893 903 bekannt. Bei der aus dieser Druckschrift vorbekannten Leitschaufel ist der schwenkbare Schaufelteil über zwei Bolzenscharniere, die innerhalb der Schaufeloberflächenkontur angeordnet sind, am feststehenden Schaufelteil angelenkt. Der Scharnierspalt wird auf einer Seite durch eine verformbare Metallplatte verdeckt, auf der anderen Seite durch eine flexible Abdeckung. Ein Nachteil der vorbezeichneten Schaufelkonstruktion ist darin zu sehen, daß aufgrund der innenliegenden Schwenkachse nur kleine Schwenkwinkel zugelassen werden können, wenn die Oberflächen der beiden Abdeckplatten stetig gekrümmt bleiben sollen. Ein anderer Nachteil besteht darin, daß die Anordnung zweier Schwenkscharniere im Inneren der Schaufel baulich aufwendig ist.A blade of the aforementioned type is known from JP-A 5 893 903. In the guide vane known from this publication, the pivotable vane part is articulated on the fixed vane part via two bolt hinges which are arranged within the vane surface contour. The hinge gap is covered on one side by a deformable metal plate, on the other side by a flexible cover. A disadvantage of the aforementioned blade construction is that only small swivel angles can be permitted due to the swivel axis on the inside if the surfaces of the two cover plates are to remain continuously curved. Another disadvantage is that the arrangement of two pivot hinges inside the blade is structurally complex.

Aus der US-A 3 237 918 ist ebenfalls eine Leitschaufel der eingangs beschriebenen Bauart bekannt. Auch bei dieser Leitschaufel liegt die Schwenkachse etwa in der Mitte zwischen den beiden Schaufelflächen. Um das Problem der stetigen Oberflächen bei unterschiedlicher Krümmung bzw. unterschiedlichen Schwenkstellungen der Schaufelteile zueinander zu lösen, ist bei dieser vorbekannten Leitschaufel die Schaufeloberfläche über einen erheblichen Bereich zweiwandig ausgebildet. Diese Ausbildung und die Anordnung des Schwenkscharniers im Inneren der Schaufel bedingen, wie auch bei der zuerst beschriebenen Schaufel aus dem Stand der Technik, vergleichsweise großen Bauaufwand.A guide vane of the type described at the outset is also known from US Pat. No. 3,237,918. With this guide vane, too, the pivot axis lies approximately in the middle between the two vane surfaces. In order to solve the problem of the constant surfaces with different curvature or different pivoting positions of the blade parts relative to one another, the blade surface in this previously known guide blade has a double-walled design over a considerable area. This design and the arrangement of the pivot hinge in the interior of the blade, as in the first described blade from the prior art, require a comparatively large amount of construction.

Aufgabe der vorliegenden Erfindung ist es, eine Leitschaufel der eingangs beschriebenen Gattung zu schaffen, die bei unterschiedlichen Schwenkwinkein eine möglichst stetige Oberfläche, zumindest aber eine spalt- und faltenfreie Oberfläche aufweist, wobei baulich einfachste Mittel ausreichen sollen, und wobei hohe Betriebssicherheit gegeben sein soll.The object of the present invention is to create a guide vane of the type described in the introduction, which has a surface that is as continuous as possible, but at least a surface that is free of gaps and wrinkles at different pivoting angles, the simplest means of construction being sufficient, and high operational reliability.

Erfindungsgemäß wird die gestellte Aufgabe dadurch gelöst, daß bei einer Schaufel der eingangs beschriebenen Gattung das schwenkbare Schaufelteil mittels eines Scharnieres, das in der äußeren Begrenzungslinie (Außenkontur) der Leitschaufel liegt, mit dem feststehenden Schaufelteil verbunden ist, wobei dieses Scharnier durch ein elastisches Band gebildet wird, das bei beiden Schaufelteilen befestigt ist, und den Gelenkspalt zwischen diesen Teilen überdeckt.According to the invention, the object is achieved in that, in the case of a blade of the type described in the introduction, the pivotable blade part is connected to the fixed blade part by means of a hinge which lies in the outer boundary line (outer contour) of the guide blade, this hinge being formed by an elastic band is attached to both blade parts and covers the joint gap between these parts.

Hauptvorteile dieser erfindungsgemäßen Ausbildung einer Leitschaufel sind geringer konstruktiver Aufwand, günstiger Verlauf der Oberflächenkontur bei unterschiedlichen Schwenkwinkeln, hohe Betriebssicherheit auch bei thermischer Belastung infolge des Mangels mechanischer Schwenkscharniere und schließlich geringer Raumbedarf und damit günstige Platzverhältnisse im Bereich eines Leitschaufelkranzes.The main advantages of this embodiment of a guide vane according to the invention are low design effort, a favorable course of the surface contour at different swivel angles, high operational reliability even under thermal stress due to the lack of mechanical swivel hinges and, finally, small space requirements and thus favorable space conditions in the area of a guide vane ring.

Vorteilhaft ist es, wenn in weiterer Ausgestaltung der Erfindung, der Gelenkspalt auf der dem Scharnier gegenüberliegenden Seite durch ein flexibles Band überdeckt wird, welches nur an einem der beiden Schaufelteile befestigt ist. Auch diese Ausbildung stellt eine baulich einfache, weitgehend verschieißfreie und damit wartungsfreie Konstruktion dar.It is advantageous if, in a further embodiment of the invention, the joint gap on the side opposite the hinge is covered by a flexible band which is fastened only to one of the two blade parts. This training also represents a structurally simple, largely wear-free and therefore maintenance-free construction.

Wiederum im Hinblick auf eine baulich einfache kostengünstige Herstellung der erfindungsgemäßen Leitschaufel wird vorgeschlagen, daß die Befestigung des elastischen Bandes an den Schaufelteilen eine Kleb-, Niet- oder Schweißverbindung ist.Again with a view to a structurally simple, inexpensive manufacture of the guide vane according to the invention, it is proposed that the fastening of the elastic band to the vane parts be an adhesive, riveted or welded connection.

Dabei soll das flexible Band vorzugsweise aus einem Fluorpolymerkunststoff bestehen. Das elastische Band kann aus einem faserverstärkten Kunststoff bestehen.The flexible band should preferably consist of a fluoropolymer plastic. The elastic band can consist of a fiber-reinforced plastic.

Bei einer bevorzugten Ausführungsform der Erfindung ist ein Verstellglied für das schwenkbare Schaufelteil als zylindrischer Bolzen ausgebildet, der koaxial zur Schwenkachse des Scharniers gelagert ist und im Bereich seiner Befestigung am schwenkbaren Schaufelteil im wesentlichen bündig mit der Außenkontur dieses Schaufelteils ausgespart ist. Auf diese Weise kann das Lager des Verstellgliedes ein übliches Dreh- bzw. Schwenklager sein. Die Lagerung des Verstellgliedes erfolgt bei einer bevorzugten Ausführungsform einseitig in einem Umfangsring, vorzugsweise dem Außenring des Turbomaschinengehäuses.In a preferred embodiment of the invention, an adjusting member for the pivotable blade part is designed as a cylindrical bolt which is mounted coaxially to the pivot axis of the hinge and is recessed substantially flush with the outer contour of this blade part in the region of its attachment to the pivotable blade part. In this way, the bearing of the adjusting member can be a conventional pivot or pivot bearing. In a preferred embodiment, the adjustment member is mounted on one side in a circumferential ring, preferably the outer ring of the turbomachine housing.

Ein Ausführungsbeispiel der Erfindung ist in der beigefügten Zeichnung schematisch dargestellt und in der zugehörigen Beschreibung erläutert.An embodiment of the invention is shown schematically in the accompanying drawing and explained in the accompanying description.

In der Zeichnung zeigt

  • Fig. 1 einen Querschnitt durch eine verstellbare zweiteilige Leitschaufel mit symmetrischem Profil in Anströmrichtung,
  • Fig. 2 einen Längsschnitt durch einen Ringkanal einer Turbomaschine mit einer verstellbaren Leitschaufel gemäß Fig. 1,
  • Fig. 3 eine Ansicht des Verstellmechanismus der Leitschaufel gemäß Fig. 2 im Schrägbild,
  • Fig. 4 den Bereich der Schwenkachse aus Fig. 1, vergrößert und
  • Fig. 5 einen Schnitt entsprechend Fig. 4 in einer zweiten Schwenkstellung.
In the drawing shows
  • 1 shows a cross section through an adjustable two-part guide vane with a symmetrical profile in the inflow direction,
  • 2 shows a longitudinal section through an annular channel of a turbomachine with an adjustable guide vane according to FIG. 1,
  • 3 is a perspective view of the adjustment mechanism of the guide vane according to FIG. 2,
  • Fig. 4, the area of the pivot axis of FIG. 1, enlarged and
  • Fig. 5 shows a section corresponding to FIG. 4 in a second pivot position.

Die Leitschaufel 1 hat einen feststehenden Schaufelteil 2 und einen schwenkbaren Schaufelteil 3 mit einer Trennung zwischen den beiden im Bereich der größten Schaufeldicke, wobei das Schaufelteil 2 im Bereich der Trennung Bogenkonturen 5 aufweist, um bei Schwenkung gemäß dem eingezeichneten Bogenpfeil in Fig. 1 ein Verstellglied 4 nicht zu behindern. Der mit 8 bezeichnete Gelenkspalt zwischen den beiden Schaufelteilen 2, 3 wird auf einer Seite von einem elastischen Band 6 bedeckt, welches beidseitig über die Höhe der Schaufel einerseits am feststehenden Schaufelteil 2, andererseits am schwenkbaren Schaufelteil 3 befestigt ist. Auf der anderen Seite der Leitschaufel wird der Gelenkspalt 8 von einem flexiblen Band 7 abgedeckt, welches einseitig über die Länge der Schaufel am Schaufelteil 2 befestigt ist, während es mit seiner anderen Seite auf der Oberfläche des Schaufelteils 3 aufliegt. Eine Schwenkung des Schaufelteils 3 gegenüber dem feststehenden Schaufelteil 2 erfolgt mittels des Verstellgliedes 4, welches in das Schaufelteil 3 über eine Schwalbenschwanzführung eingesetzt und gehalten ist. Dabei dient das elastische Band 6 als Schwenkscharnier mit der Schwenkachse HA.The guide vane 1 has a fixed vane part 2 and a pivotable vane part 3 with a separation between the two in the area of the greatest vane thickness, the vane part 2 having arch contours 5 in the area of the separation, for an adjustment element when pivoted according to the bow arrow shown in FIG. 1 4 not to hinder. The joint gap designated 8 between the two blade parts 2, 3 is on one side by an elastic band 6 be covers, which is fixed on both sides over the height of the blade on the one hand on the fixed blade part 2, on the other hand on the pivotable blade part 3. On the other side of the guide vane, the joint gap 8 is covered by a flexible band 7, which is fastened on one side over the length of the vane to the vane part 2, while its other side rests on the surface of the vane part 3. The blade part 3 is pivoted relative to the fixed blade part 2 by means of the adjusting member 4, which is inserted and held in the blade part 3 via a dovetail guide. The elastic band 6 serves as a pivot hinge with the pivot axis HA.

Wie aus Fig. 2 hervorgeht, ist das Verstellglied 4 als zylindrischer Bolzen ausgebildet, welcher in der Schwenkachse HA in einer Lagerbüchse 11 in einem Lagerauge 22 eines Außenrings 10 des Turbomaschinengehäuses gelagert ist. Am oberen Ende des Verstellgliedes 4 ist drehsteif ein Schwenkhebel 13 befestigt, der über ein Gelenkstück 14 und einen Stellring 15 betätigbar ist. Im Bereich seiner Befestigung am schwenkbaren Schaufelteil 3 ist der das Verstellglied 4 bildende zylindrische Bolzen so ausgespart, daß er bündig mit der Außenkontur des Schaufelteils 3 verläuft. Weiterhin ist der Bolzen bei 12 so abgeflacht, daß bei maximalem Schwenkwinkel des Schaufelteils 3 gegenüber dem feststehenden Schaufelteil 2 der Bolzen nicht über die Außenkontur der Schaufel hervortritt.As can be seen from FIG. 2, the adjusting member 4 is designed as a cylindrical bolt, which is mounted in the pivot axis HA in a bearing bush 11 in a bearing eye 22 of an outer ring 10 of the turbomachine housing. At the upper end of the adjusting member 4, a pivot lever 13 is fastened in a torsionally rigid manner and can be actuated via a joint piece 14 and an adjusting ring 15. In the area of its attachment to the pivotable blade part 3, the cylindrical bolt forming the adjusting member 4 is recessed in such a way that it runs flush with the outer contour of the blade part 3. Furthermore, the bolt is flattened at 12 so that at the maximum pivoting angle of the blade part 3 with respect to the fixed blade part 2, the bolt does not protrude beyond the outer contour of the blade.

Als Werkstoffe sind für das flexible Band 6 Folien aus Fluorkohlenstoffen wie FEB oder PTFE geeignet. Weiter sind Kunstharze verschiedener Art, insbesondere Polymerkunststoffe einschließlich Polyimid anwendbar.Suitable materials for the flexible tape are 6 foils made of fluorocarbons such as FEB or PTFE. Various types of synthetic resins, in particular polymer plastics including polyimide, can also be used.

Das elastische Band 6 kann aus einem Elastomer oder einem Kunststoff, wie Siliconkautschuk bestehen. Besonders geeignet sind faserverstärkte Kunststoffe aus Elastomeren oder kautschukartige Kunststoffe. Gewebeeinlagen, insbesondere Kohlenstoff-, Glasfaser- oder Metallfadengewebe sind je nach Einsatzzweck und Betriebstemperatur geeignet.The elastic band 6 can consist of an elastomer or a plastic, such as silicone rubber. Fiber-reinforced plastics made of elastomers or rubber-like plastics are particularly suitable. Fabric inserts, in particular carbon, glass fiber or metal thread fabrics, are suitable depending on the intended use and operating temperature.

Unter elastisch im Sinne der Erfindung wird ein Körper verstanden, der sich im wesentlichen nach dem Hooke'schen Gesetz verhält, also nach einer Auslenkung infolge Krafteinwirkung federnd in seine Ausgangslage zurückkehrt. Unter flexibel im Sinne der Erfindung wird ein Körper verstanden, der biegbar ist, jedoch nicht oder nur sehr begrenzt elastische, d.h. federnde Eigenschaften besitzt.Elastic in the sense of the invention is understood to mean a body that essentially behaves according to Hooke's law, that is to say resiliently returns to its starting position after a deflection as a result of the action of force. For the purposes of the invention, flexible is understood to mean a body that is bendable, but not elastic or only very limited elastic, i.e. has resilient properties.

In den vergrößerten Schnittdarstellungen gemäß Fig. 4 und Fig. 5 sind die Bauteile der Leitschaufel mit denselben Bezugszeichen versehen wie in den Fig. 1 bis 3. Zusätzlich zur Darstellung nach Fig. 1 ist in Fig. 4 das Verstellglied 4 mit seinen abgeflachten Seitenflächen 12 und 12b und seiner zylindrischen Außenkontur 12a dargestellt. Sowohl das flexible Band 7 als auch das elastische Band 6 sind mit Schraffuren versehen. Das elastische Band 6 ist an den Stellen 6' und 6" jeweils unlösbar mit dem Schaufelteil 2 bzw. 3 verbunden. In Fig. 5 ist die lose Seite des flexiblen Bandes 7 mit 7" bezeichnet, wo sie auf der Oberfläche des schwenkbaren Schaufelteils 3 lose aufliegt, während die andere Seite 7' des Bandes 7 am feststehenden Schaufelteil 2 befestigt ist.4 and 5, the components of the guide vane are provided with the same reference numerals as in FIGS. 1 to 3. In addition to the representation according to FIG. 1, the adjusting member 4 with its flattened side surfaces 12 is shown in FIG. 4 and 12b and its cylindrical outer contour 12a. Both the flexible band 7 and the elastic band 6 are hatched. The elastic band 6 is in each case permanently connected to the blade part 2 or 3 at the points 6 ′ and 6 ″. In FIG. 5, the loose side of the flexible band 7 is designated 7 ″, where it lies on the surface of the pivotable blade part 3 loosely rests, while the other side 7 'of the band 7 is attached to the fixed blade part 2.

Claims (8)

1. Guide vane for turbines, particularly for gas turbines with a blade part (2) fixed on the inlet side and, pivotable in respect thereof, a blade part (3) on the outlet side, the separation between the fixed and the pivotable blade parts being in the region of maximum blade thickness, characterised in that the pivotable blade part (3) is connected to the fixed blade part (2) by means of a hinge disposed in the outer boundary line (outer contour) of the guide vane, this hinge being constituted by a resilient strip (6) attached to both blade parts (2, 3) and masking the joint gap (8) between these parts.
2. Guide vane according to Claim 1, characterised in that on the side opposite the hinge, the joint gap (8) is masked by a flexible strip (7) which is attached to only one of the two blade parts (2, 3).
3. Guide vane according to one of Claims 1 or 2, characterised in that the resilient strip (6) is attached to the blade parts by adhesion, riveting or welding.
4. Guide vane according to one of the preceding Claims, characterised in that the flexible strip (7) consists of a fluoropolymer synthetic plastics material.
5. Guide vane according to one of the preceding Claims, characterised in that the flexible strip (6) consists of a fibre-reinforced synthetic plastics material.
6. Guide vane according to one of the preceding Claims, characterised in that the adjusting member (4) for the pivotable blade part is a cylindrical bolt mounted coaxially with the pivot spindle (HA) of the hinge and in the region of its mounting on the pivotable blade part (3) is recessed substantially flush with the outer contours of this blade part (3).
7. Guide vane according to one of the preceding Claims, characterised in that the flexible strip (6) is attached to the adjusting member (4) for the pivotable blade part (3).
8. Guide vane according to one of the preceding Claims, characterised in that the adjusting member (4) is mounted at one end in a peripheral ring, preferably the outer ring (10) of the turbine housing.
EP86115712A 1985-11-14 1986-11-12 Variable guide vane for a turbo machine Expired EP0223194B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853540401 DE3540401A1 (en) 1985-11-14 1985-11-14 Vane ring for turbo machines, especially for gas turbines
DE3540401 1985-11-14

Publications (2)

Publication Number Publication Date
EP0223194A1 EP0223194A1 (en) 1987-05-27
EP0223194B1 true EP0223194B1 (en) 1989-05-24

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EP86115712A Expired EP0223194B1 (en) 1985-11-14 1986-11-12 Variable guide vane for a turbo machine

Country Status (5)

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US (1) US4741665A (en)
EP (1) EP0223194B1 (en)
JP (1) JPS62118007A (en)
DE (2) DE3540401A1 (en)
ES (1) ES2008849B3 (en)

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DE10257044A1 (en) * 2002-12-06 2004-07-08 Mtu Aero Engines Gmbh Gas turbine particularly to power aircraft has fixed guide vanes has curvature of guide vanes and simultaneously entry angle and/or emergence angle of vanes adjustable independent of each other

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US4979874A (en) * 1989-06-19 1990-12-25 United Technologies Corporation Variable van drive mechanism
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DE4208311A1 (en) * 1992-03-16 1993-09-23 Asea Brown Boveri Flow control guide system for steam turbine - uses two=part guide blades with rear part capable of swivel movement
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Also Published As

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JPS62118007A (en) 1987-05-29
EP0223194A1 (en) 1987-05-27
DE3540401A1 (en) 1987-05-21
DE3663558D1 (en) 1989-06-29
US4741665A (en) 1988-05-03
ES2008849B3 (en) 1989-08-16

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