Stator component with segmented inner ring for a turbomachine

Patent metadata

Field	Value
Publication number	US-9702262-B2
Application number	US-201414335203-A
Country	US
Kind code	B2
Filing date	Jul 18, 2014
Priority date	Jan 26, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A stator component of a turbomachine includes at least one axially extending outer ring which serves as a frame of an inner ring composed of partial segments. The partial segments are arranged on one another such that, on the rotor side, to form a coherent circular circumferential surface in relation to the rotational movement of rotor blades. The individual partial segment is composed of a material of uniform construction or, at least in a radial direction, of multiple partial bodies constructed from different materials, such as for example ceramic, wherein a partial segment thus formed exhibits predetermined stress and/or expansion behavior as a function of the load ranges of the turbomachine.

First claim

The invention claimed is:

1. A stator component for a turbomachine, consisting substantially of at least one axial outer ring and one inner ring, wherein the outer ring serves as a holder for the inner ring consisting of partial segments, wherein the partial segments are arranged with respect to one another such that, in an installed state, the partial segments form a circular inner ring on a rotor side facing a rotational movement of rotor blades, wherein the partial segments consist of one of a material of uniform construction or a material constructed at least gradually in a radial direction or at least in the radial direction of a plurality of partial bodies constructed of different materials, and the partial segments formed in this manner are heated when the turbomachine is in operation, depending on load ranges of the turbomachine, such that a temperature gradient from radially inwards to outwards results,
wherein the partial segments abut against one another in a circumferential direction, forming a tapered gap, wherein the gap is narrowing in a radially outward direction, wherein spacing in the gap is kept such that, in operation, a temperature gradient between the adjacent partial segments produces a force fit which leads to a predetermined profile of compressive stress between the partial segments over an entire radial expansion or only over radial sections of the partial segments.

2. The stator component as claimed in claim 1 , wherein the predetermined profile of the compressive stress is of identical shape or practically constant or deviates by not more than 20% of an average value of the stress over at least 80% of a surface at which the partial segments abut against one another.

3. The stator component as claimed in claim 1 , wherein the partial segment consists entirely or partially of a ceramic material.

4. The stator component as claimed in claim 3 , wherein the partial segment consists of at least 70% by weight or by volume of ceramic.

5. The stator component as claimed in claim 4 , wherein the ceramic material is constructed substantially of at least one of zirconium oxides, aluminum oxides, and magnesium oxides.

6. The stator component as claimed in claim 5 , wherein the oxides consist of 50-100% by weight or by volume.

7. The stator component as claimed in claim 1 , wherein the partial segment consists, in the axial direction or in the circumferential direction of the inner ring, of a plurality of partial bodies constructed of different materials.

8. The stator component as claimed in claim 1 , wherein the outer ring consists entirely or partially of a metallic material.

9. The stator component as claimed in claim 1 , wherein the outer ring of the stator component is constructed in a single piece or in a plurality of pieces.

10. The stator component as claimed in claim 1 , wherein the at least one partial segment is, at least in the radial direction, prismatic or quasi-prismatic in shape and has, facing the inner circumferential surface of the outer ring, a surface having a substantially planar, concave, convex or nodular profile.

11. The stator component as claimed in claim 1 , wherein the partial segments slotted together to form a composite unit establish a form fit, a frictional connection or a material-bonded fit in at least one of the circumferential direction and in the radial direction.

12. The stator component as claimed in claim 11 , wherein the installation of the partial segments to form the inner ring by means of a force fit is such that the force fit between the adjacent partial segments is provided with a compressive stress greater than zero and less than 50 MPa.

13. The stator component as claimed in claim 12 , wherein, in operation, the force fit between the individual partial segments has a compressive stress of up to 500 MPa.

14. The stator component as claimed in claim 11 , wherein the installation of the partial segments to form the inner ring by means of a form fit is such that, in operation, the form fit becomes a force fit.

15. The stator component as claimed in claim 11 , wherein the installation of the partial segments to form the inner ring by means of a form fit is such that the form fit has a labyrinth fit oriented axially or quasi-axially.

16. The stator component as claimed in claim 15 , wherein the labyrinth fit between the adjacent partial segments has, at least in the radial direction, a decreasing spacing.

17. The stator component as claimed in claim 1 , wherein at least one seal element is installed in the radial direction between the outer diameter of the outer ring and the inner diameter of the inner ring.

18. The stator component as claimed in claim 17 , wherein the at least one seal element extends on either side of and in the circumferential direction of the stator component.

19. The stator component as claimed in claim 1 , wherein the partial segment has on the rotor side an abradable layer.

20. The stator component as claimed in claim 1 , wherein the partial segment has internal throughflow ducts through which a coolant flows.

21. The stator component as claimed in claim 1 , wherein material layering in the partial segments is chosen such that inner materials have a smaller coefficient of expansion than outer materials, such that the compressive stress resulting from an expansion of the partial segments in the circumferential direction between partial segments in the inner ring adopts a predetermined stress profile.

22. The stator component as claimed in claim 1 , wherein a material layering in the partial segments is chosen such that the inner materials have a smaller coefficient of expansion than the outer materials, such that the expansion of the partial segments in the circumferential direction, in combination with the tapered gap in the circumferential direction between partial segments in abutment against one another produces a predetermined profile of the compressive stress between the partial segments.

Assignees

• Alstom Technology Ltd
• Ansaldo Energia Ip Uk Ltd

Inventors

• Brandl Herbert
• Bossmann Hans-Peter

Classifications

• F05D2300/20

  Oxide or non-oxide ceramics · CPC title

• F01D9/04 Primary

  forming ring or sector · CPC title

• F05D2300/21

  Oxide ceramics · CPC title

• F05D2300/50212

  dissimilar · CPC title

• F05D2300/2112

  Aluminium oxides · CPC title