Fish mouth seal carrier

Patent metadata

Field	Value
Publication number	US-9856736-B2
Application number	US-201314056876-A
Country	US
Kind code	B2
Filing date	Oct 17, 2013
Priority date	Oct 17, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A fish mouth seal carrier for a guide vane arrangement of a gas turbine comprises a first half-shell element and a second half-shell element bonded to it, which together form a box profile with two axial arms and two radial arms. A sealing element is arranged on one of the axial arms of the box profile. At least one of the two half-shell elements has an integrally formed axial flange for forming, with a guide vane platform, a fish mouth seal accommodating an axial flange of an adjoining moving blade radially between the guide vane platform and the axial flange of the seal carrier.

First claim

What is claimed is:

1. A fish mouth seal carrier for a guide vane arrangement of a gas turbine, the gas turbine having a guide vane with a radial inner platform defining a first axial extent and having a single spoke extending radially inward from the radial inner platform, a plurality of moving blades disposed axially adjacent to the guide vane, at least one of the moving blades having an axial flange disposed radially inward from the radial inner platform, the axial flange extending axially from the moving blade defining a second axial extent to a position radially across from the radial inner platform of the guide vane and within the first axial extent such that a first portion of the first axial extent of the radial inner platform axially overlaps at least some of the second axial extent of the axial flange of the moving blade on a radially outward side of the axial flange of the moving blade, the seal carrier comprising:
a first half-shell element having
a radial inner axial arm section,
a radial arm and
a radial outer axial arm section;

a second half-shell element having
a radial inner axial arm section,
a radial arm and
a radial outer axial arm section;

the first half-shell element connected to the second half-shell element so as to together form a box profile, the box profile including
a radial inner axial arm formed by connecting adjacent ends of the respective radial inner axial arm sections,
the two radial arms, the radial inner ends of the radial arms being connected, respectively, to non-adjacent ends of the respective radial inner axial arm sections, and
a radial outer axial arm formed by connecting non-adjacent ends of the respective radial outer axial arm sections, respectively, to radial outer ends of the two radial arms;

the box profile being mounted to the single spoke extending radially inward from the radial inner platform;
a sealing element mounted on the radial inner axial arm of the box profile; and
at least one of the first and second half-shell elements including an integrally formed axial flange,
the integrally formed axial flange being configured to extend axially toward the at least one of the plurality of moving blades disposed axially adjacent to the guide vane having the axial flange extending axially therefrom,
the integrally formed axial flange being disposed radially inward from the axial flange of the moving blade,
the integrally formed axial flange defining a third axial extent and extending axially to a position radially across from the axial flange extending from the moving blade such that a second portion of the third axial extent of the integrally formed axial flange axially overlaps at least some of the second axial extent of the axial flange of the moving blade on a radially inward side of the axial flange of the moving blade,
which together with a radial inner platform of a guide vane of a gas turbine, forms a fish mouth seal accommodating the axial flange extending from the adjoining moving blade radially between the radial inner platform and the integrally formed axial flange such that the radial inner platform axially overlaps at least the first portion of the axial flange of the moving blade on the radial outward side and the integrally formed axial flange axially overlaps at least the second portion of the axial flange of the moving blade on the radial inward side.

2. A fish mouth seal carrier in accordance with claim 1 , wherein at least one of the first half-shell element or the second half-shell element further includes:
a U-profile configured from the respective radial inner axial arm section, the respective radial arm and the respective radial outer axial arm section; and
a radial flange connected at a first end to the respective radial outer axial arm section.

3. A fish mouth seal carrier in accordance with claim 2 , wherein both the first and second half-shell elements include respective radial flanges disposed adjacent to the single spoke connected at a first end to the respective radial outer axial arm sections, and further comprising a slide body for suspending the fish mouth seal carrier on the single spoke of the guide vane, the slide body being seated in an elongated hole formed in the single spoke of the guide vane on both sides axially between the radial flange of the first half-shell element and the radial flange of the second half-shell element.

4. A fish mouth seal carrier in accordance with claim 1 , wherein the sealing element includes a honeycomb seal.

5. A fish mouth seal carrier in accordance with claim 1 , wherein the sealing element extends at least essentially axially at least from one radial arm to the other radial arm of the box profile.

6. A fish mouth seal carrier in accordance with claim 1 , further comprising:
at least one reinforcing element connected to one radial flange of the box profile; and
wherein the reinforcing element is one of a radial ring or an axial ring.

7. A fish mouth seal carrier in accordance with claim 6 , wherein the reinforcing element is a radial ring having a first wall thickness in a radial direction that is at least double a second wall thickness in an axial direction.

8. A fish mouth seal carrier in accordance with claim 6 , wherein the reinforcing element is an axial ring having a first wall thickness in an axial direction that is at least double a second wall thickness in a radial direction.

9. A fish mouth seal carrier in accordance with claim 1 , wherein the axial flange of the first and/or second half-shell element extends at least essentially in an axial direction.

10. A fish mouth seal carrier in accordance with claim 9 , wherein the axial flange further includes one of radial passages or stages.

11. A gas turbine comprising:
a guide vane including an radial inner platform defining a first axial extent and having a single spoke extending radially inward from the radial inner platform;
at least one moving blade axially adjoining the guide vane and including an axial flange disposed radially inward from the radial inner platform, the axial flange extending axially from the moving blade defining a second axial extent to a position radially across from the radial inner platform of the guide vane and within the first axial extent such that a first portion of the first axial extent of the radial inner platform axially overlaps at least some of the second axial extent of the axial flange of the moving blade on a radially outward side of the axial flange of the moving blade;
a seal carrier including
a first half-shell element having a radial inner axial arm section, a radial arm and a radial outer axial arm section and
a second half-shell element having a radial inner axial arm section, a radial arm and a radial outer axial arm section;
the first half-shell element connected to the second half-shell element so as to together form a box profile, the box profile including
a radial inner axial arm formed by connecting adjacent ends of the respective radial inner axial arm sections,
the two radial arms, the radial inner ends of the radial arms being connected, respectively, to non-adjacent ends of the respective radial inner axial arm sections, and
a radial outer axial arm formed by connecting non-adjacent ends of the respective radial outer axial arm sections, respectively, to radial outer ends of the two radial arms;

the box profile being mounted to the single spoke extending radially inward from the radial inner platform;
a sealing element mounted on the radial inner axial arm of the box profile; and
at least one of the first and second half-shell elements including an integrally formed axial flange
the integrally formed axial flange extending axia

Assignees

• MTU Aero Engines AG

Inventors

• Stiehler Frank

Classifications

• F01D5/08 Primary

  Heating, heat-insulating or cooling means {(specially adapted for radial flow machines or engines F01D5/04)} · CPC title

• F01D11/001 Primary

  for sealing space between stator blade and rotor · CPC title

• Y10T29/49321

  Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member · CPC title

• F01D11/02

  by non-contact sealings, e.g. of labyrinth type (for sealing space between rotor blade tips and stator F01D11/08) · CPC title

• B21J5/00

  Methods for forging, hammering, or pressing (for working sheet-metal or metal tubes, rods, or profiles B21D; for working wire B21F); Special equipment or accessories therefor · CPC title