EP2722486B1 - Seal holder for a stator assembly - Google Patents

Description

The present invention relates to a fish-mouth seal carrier for a guide vane assembly of a gas turbine, a vane assembly or gas turbine with such a fish-mouth seal carrier and a method for its production.

From the US 5,215,435 A For example, a gas turbine with a vane assembly having a platform to which a fishmouth seal carrier is secured with a honeycomb seal is known. The fishmouth seal carrier is composed of a total of five sheet metal parts: an S-shaped sheet metal part to form a fishmouth gasket, an L-shaped sheet metal part to form an opposite fishmouth gasket, a U-shaped sheet metal part, a radial flange of the platform and a head between its radial legs a screw is arranged, a C-shaped sheet metal part in which a washer is received, which passes through the screw, and finally a G-shaped sheet metal part which carries the S-shaped sheet metal part, wherein the honeycomb seal on the L and the G is attached shaped sheet metal part.

From the US 2011/0052380 A1 a fish-mouth seal carrier is known, both in the construction proposed by this application and the prior art known from this application, an axial flange for forming a Fischmauldichtung is formed by a separate beveled sheet, which is fixed by soldering to an end face.

An object of an embodiment of the present invention is to improve the manufacture and / or operation of a gas turbine.

This object is achieved by a fish-mouth seal carrier with the features of claim 1. The claims 7, 8 and 9 provide a guide vane assembly or gas turbine with such a fish-mouth seal carrier or a method for its production under protection. Advantageous developments are the subject of the dependent claims.

According to one aspect of the present invention, a fishmouth seal carrier for a guide vane assembly of a gas turbine on a first half-shell member and a materially connected thereto, in particular welded, second half-shell element, which together a box section with two axial legs and form two radial legs. A sealing element, which in one embodiment has a honeycomb seal, in particular can be, is arranged on an outer side of a, in installation position radially inner, this axial leg of the box profile.

Through this box construction, in one embodiment, in particular compared with the open profile of US 5,215,435 A , the operating behavior, in particular a rigidity of the fish mouth seal carrier or the storage of its sealing element can be improved. In the context of the present invention, a box profile is understood in particular to mean a profile which has two, in particular at least substantially parallel, axial legs and two, in particular at least substantially parallel, radial legs, in particular thereof, which in a further embodiment is preferably at least substantially rectangular , Corners merge into each other.

The first and / or second half-shell element has in each case an axial flange for forming a fish mouth seal, which is formed integrally or integrally with the half-shell element, in particular, ur- or reshaped.

Due to this integral design can in one embodiment, in particular compared with the many sheet metal parts of US 5,215,435 A , the production and / or the performance of the fish mouth seal carrier are improved.

The Axialflansch acts in one embodiment as a so-called deflector of Fischmauldichtung. Opposite it radially in one embodiment is a radially inner platform of a vane assembly having one or more vanes to which the fishmouth seal carrier in one embodiment is suspended by means of a spoke centering. Radial between the platform and the axial flange, an axial flange of an adjacent blade assembly is arranged with one or more blades. As stated above, a Fischmauldichtung upstream and / or downstream of the vane assembly may be formed or have the first and / or second half-shell element of the fish-mouth seal carrier having a corresponding, designed as a deflector Axialflansch. The axial flange of the first and / or second half-shell element extends in one embodiment, at least substantially, in the axial direction. He may have radial paragraphs or steps.

In one embodiment, the first half-shell element has a U-profile for forming the box profile and a radial flange formed integrally therewith. In one embodiment, the radial flange can be followed by the axial flange on the side opposite the U-profile to form a fish gauge.

The second half-shell element can have a radial flange, to which the axial flange can connect in one embodiment to form a fish-measuring direction. On the radially opposite side of this axial flange, the radial flange, together with the U-profile of the first half-shell element, can form the box profile, i. Completing the U-shaped profile lid-like and essentially form a radial leg of the U-profile. In an alternative embodiment, a U-profile for forming the box profile also connects to the radial flange on the second half-shell element on the axial flange, so that both half-shell elements each form a radial leg and in each case a part of the two axial legs of the box profile.

In one embodiment, a slider for suspending the fishmouth seal carrier on the vane assembly between the radial flange of the first half-shell member and the radial flange of the second half-shell member is mounted on both sides. In particular, the fish-mouth seal carrier may for this purpose have a bolt which passes through passage openings in the radial flanges and the sliding body arranged between them and thus defines them. The bolt can in particular be detachably or non-detachably fastened to the radial flanges, in particular screwed or riveted. In one embodiment, the sliding body can be accommodated in a passage opening, in particular a slot, of the guide blade arrangement, so that the fish-mouth seal carrier is suspended by means of spoke centering on the guide blade arrangement. In particular, the sliding body can space and / or support the two radial flanges and thus improve the rigidity of the box profile.

Additionally or alternatively, an additional sheet may be fixed to the radial flange of the first or second half-shell element. It can be axially supported on the vane assembly and thus secure the fishmouth seal carrier axially. The additional sheet may be arranged in an embodiment between the radial flange of the first half-shell element and the radial flange of the second half-shell element, in particular between the sliding body and a radial flange. In one embodiment, the additional sheet may be frictionally secured to the radial flange, in particular clamped between this and the slider, in particular by a bolt which connects the two radial flanges and / or superimposed on the slider. In one embodiment, a joint friction is impressed by the frictionally fixed additional sheet, which can advantageously damp vibrations. Similarly, the additional sheet can be firmly bonded to the radial flange, in particular welded to this.

In one embodiment, the sealing element extends, at least substantially, axially from one to the other radial leg of the box section. In this way, a wide support surface can be provided and the box profile can be optimally used. In one embodiment, the sealing element has a honeycomb seal and a carrier, in particular a carrier plate, which is arranged on the outside of the axial leg, in particular cohesively, connected thereto, in particular soldered, welded or glued, and on whose axialschenkelabgewandten side the Honigwabendichtung, in particular cohesively, attached, in particular soldered, welded or glued. In a further development, the honeycomb seal can extend at least substantially axially from one to the other radial leg of the box profile and, in contrast, the carrier can project axially beyond one or both radial legs. This can protect the Honigwabendichtung especially with an axial rubbing.

In one embodiment, at least one reinforcing element, in particular a reinforcing plate, attached to one or both radial limbs of the box section, in particular cohesively, preferably by welding, soldering or gluing. Additionally or alternatively, one or both radial legs may have an integral wall thickness thickening. Through these separately attached and / or integral Running reinforcement of the radial leg or in one embodiment, the robustness against axial rubbing be increased.

For producing a fish-mouth seal carrier according to one aspect of the present invention, one or both half-shell elements, in particular casting technology, are formed into a urine. Similarly, one or both half-shell elements, in particular forging technology, can be reshaped. In one embodiment, one or both half shell elements are designed as sheet metal construction. In particular, they can have a wall thickness which is a maximum of 5 mm, in particular a maximum of 3 mm, preferably a maximum of 2 mm. Due to the box construction, high rigidity can thus be achieved in one embodiment, despite the low wall thickness and correspondingly low weight.

The two half-shell elements are firmly bonded together. In particular, they can be welded together, preferably without additional material, in particular by laser or friction welding. This allows a light and reliable joint connection can be achieved. Likewise, they can also be glued or soldered together.

In one embodiment, the two half-shell elements are connected to each other at impact, in particular with end faces of one axial leg of a U-profile of the half-shell elements. In this way, the weight can be reduced and / or the welding can be simplified. Similarly, half-shell elements can be connected to each other surface, in particular by welding superimposed axial leg of the two half-shell elements.

Before or after the cohesive bonding, the sealing element is arranged on an axial leg of the box profile. In particular, it may be made integral with one or both half-shell elements or connected to them prior to their connection. In a further development, the sealing element may be formed axially divided, wherein a part, in particular before the cohesive joining of the two half-shell elements together, with the first half-shell element and the other part is connected to the second half-shell element.

Likewise, the sealing element can also be connected to the first and / or second half-shell element after the cohesive joining of the two half-shell elements. In one embodiment, the sealing element, in particular a Honigwabendichtung or a connected thereto, preferably one-piece, carrier, a seam or joint of the cohesive joint connection of the two half-shell elements covers each other and thus secures the joint connection. In particular, the sealing element can be connected to one or both half shell elements in a materially bonded manner, in particular welded, glued or soldered.

• Fig. 1: einen Fischmaul-Dichtungsträger einer Leitschaufelanordnung einer Gasturbine nach einer Ausführung der vorliegenden Erfindung in einem Axialschnitt.

Further advantages and features emerge from the subclaims and the exemplary embodiment. This shows, partially schematized, the only one

• Fig. 1 FIG. 2 shows a fish-mouth seal carrier of a gas turbine guide vane assembly according to an embodiment of the present invention in an axial section.

Fig. 1 shows in an axial section a part of a gas turbine with a vane arrangement with a plurality of vanes 10, at the radially inner (bottom in Fig. 1 ) Platform 11 a fishmouth seal carrier is suspended.

The fish-mouth seal carrier has a first half-shell element 1 and a second half-shell element 2 welded thereto, which together form a box profile with two substantially parallel axial limbs (1.1 + 2.1), (1.2 + 2.2) and two substantially parallel radial limbs 1.3, 2.3, which merge into each other in rounded corners. A sealing element in the form of a stepped Honigwabendichtung 3 is disposed on an outer side of the radially inner axial leg (1.1 + 2.1).

The first and second half-shell elements each have an axial flange 1.4 and 2.4, respectively, for forming a fish mouth seal, which is formed integrally with the half-shell element and functions as a deflector of the fish-mouth seal. Opposite it radially lies the radially inner platform 11 of the vane arrangement. Radial between the platform 11 and the axial flange 1.4 and 2.4, respectively, an axial flange 20.1 and 21.1 of an adjacent blade assembly with blades 20 and 21 is arranged. The axial flanges 1.4, 2.4 of the first and second half-shell elements extend substantially in the axial direction, wherein they have radial shoulders or steps.

The first half-shell element has a U-profile 1.1, 1.2, 1.3 to form the box profile and a thus formed integrally radial flange 1.5. At the radial flange closes on the U-profile radially opposite side (above in Fig. 1 ) Axialflansch 1.4 to form the Fischmauldichtung. The second half-shell element also has a radial flange 2.5 which is substantially parallel to the radial flange 1.5 of the first half-shell element and to which the axial flange 2.4 connects. Also in the second half-shell element joins on the axial flange 2.4 radially opposite side of the radial flange 2.5 a U-profile 2.1, 2.2, 2.3 to form the box profile, so that both half-shell elements each have a radial leg 1.3 and 2.3 and a part 1.1 or 2.1 of an axial leg (1.1 + 2.1) and a part 1.2 or 2.2 of the other axial leg (1.2 + 2.2) of the box profile form.

A slider 4 for suspending the fishmouth seal carrier on the vane arrangement is mounted on both sides between the radial flange 1.5 of the first half-shell element and the radial flange 2.5 of the second half-shell element. For this purpose, the fish-mouth seal carrier on a bolt 5, which passes through openings in the radial flanges 1.5, 2.5 and arranged between these sliding body 4 and this determines. The sliding body is received in a passage opening in the form of a slot 12 of the vane arrangement, so that the fish-mouth seal carrier is suspended by means of spoke centering on the vane arrangement. The slider spaced the two radial flanges 1.5, 2.5 against each other and supports them against each other.

An additional plate 6 is fixed to the radial flange 1.5 of the first half-shell element. It is supported axially on the vane assembly and thus secures the fishmouth seal carrier axially. The additional sheet is between the radial flange 1.5 of first half-shell element and the radial flange 2.5 of the second half-shell element, in particular the slider 4 and arranged by the bolt 5 frictionally fixed to the radial flange 1.5, in particular clamped between this and the slider 4.

The sealing element extends axially substantially from one radial leg 1.3 to the other radial leg 2.3 of the box section.

To produce the fish-mouth seal carrier, both half-shell elements 1.1-1.5, 2.1-2.5 are formed by casting molding or forging technology. Both half-shell elements are designed as sheet metal construction and have a wall thickness which is a maximum of 5 mm.

The two half-shell elements are then welded together without additional material, in particular by laser or friction welding. Both half-shell elements are connected to end faces of one axial limb 1.1, 2.1 of a U-profile of the half-shell elements in abutment with each other.

After the integral connection, the sealing element 3 is arranged on the axial leg (1.1 + 2.1) of the box profile and welded thereto. Here, the sealing element 3 covers a seam or joint 7 of the cohesive joint connection of the two half-shell elements from each other and thus secures the joint connection.

LIST OF REFERENCE NUMBERS

1.2

first / second half-shell element

1.1 / 2.1

Axial leg of the U-profile of the first / second half-shell element

1.2 / 2.2

Axial leg of the U-profile of the first / second half-shell element

1.3 / 2.3

Radial leg of the U-profile of the first / second half-shell element

1.4 / 2.4

Axial flange of the first / second half-shell element

1.5 / 2.5

Radial flange of the first / second half-shell element

3

Honeycomb seal (sealing element)

4

sliding

5

bolt

6

additional sheet

7

Seam or joint (joint)

10

Vane (arrangement)

11

radially inner platform

12

Long hole

20/21

Blade (arrangement)

20.1 / 21.1

Blade axial flange (arrangement) 20/21

Claims (10)

1. A fish-mouth seal carrier assembly for a guide vane arrangement (10) of a gas turbine, with a first half-shell element (1) and a second half-shell element (2), which are bonded (7) together forming a box profile with two axial arms (1.1 + 2.1, 1.2 + 2.2) and two radial arms (1.3, 2.3), and a sealing element (3) which is arranged on an axial arm (1.1 + 2.1) of the box profile, wherein at least one of the two half-shell elements has an axial flange (1.4, 2.4) for forming a fish-mouth seal, characterized in that the axial flange (1.4, 2.4) is designed integral and in one piece with the half-shell element (1, 2).
2. The fish-mouth seal carrier assembly according to the preceding claim, characterized in that the first and/or second half-shell element is/are U-shaped (1.1 - 1.3, 2.1 - 2.3) in order to form the box profile and a radial flange (1.5, 2.5) designed to be integral thereto.
3. The fish-mouth seal carrier assembly according to the preceding claim, characterized by a slide body (4) for suspending the fish-mouth seal carrier assembly on the guide vane arrangement, which body is seated on both sides between the radial flange of the first half-shell element and the radial flange of the second half-shell element, and/or by an additional sheet (6) which is fixed to the radial flange of the first or second half-shell element by friction or bonding.
4. The fish-mouth seal carrier assembly according to any one of the preceding claims, characterized in that the sealing element has a honeycomb seal (3) and/or extends, at least substantially, axially from one radial arm of the box profile to the other.
5. The fish-mouth seal carrier assembly according to any one of the preceding claims, characterized in that the axial flange of the first and/or second half-shell element extends, at least substantially, in axial direction.
6. The fish-mouth seal carrier assembly according to any one of the preceding claims, characterized in that it is produced according to a method according to claim 9 or a claim related thereto.
7. A guide vane arrangement (10) for a gas turbine, with a fish-mouth seal carrier assembly according to any one of the preceding claims and a radially inner platform (11) which, together with at least one axial flange (1.4, 2.4) of the fish-mouth seal carrier assembly, forms a fish-mouth seal for receiving an axial flange (20.1, 21.1) of an adjacent moving blade arrangement (20, 21) radially between the platform and the axial flange.
8. A gas turbine, in particular a gas-turbine power plant, with a guide vane arrangement (10) according to the preceding claim and at least one adjacent moving blade arrangement (20, 21) with an axial flange (20.1, 21.1) which is arranged radially between the platform (11) and an axial flange (1.4, 2.4) of a half-shell element (1, 2) of the fish-mouth seal carrier assembly.
9. A method for producing a fish-mouth seal carrier assembly according to any one of the preceding claims, with the steps:

   - primary shaping, in particular casting, and/or re-shaping, in particular forging, at least one half-shell element (1, 2);

   - bonding this half-shell element to the other half-shell element; and

   - arranging the sealing element (3) on an axial arm (1.1 + 2.1) of the box profile.
10. The method according to the preceding claim, wherein the two half-shell elements are bonded, in particular welded, to one another upon impact (7) at front ends of their axial arms.

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