Seal arrangement for a turbomachine and process for the production thereof

Patent metadata

Field	Value
Publication number	US-10544697-B2
Application number	US-201414490931-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Sep 19, 2013
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

The present invention relates to a process for producing a seal arrangement (1) for a turbomachine which comprises a seal support (2) and a stripping lining (3) which is arranged on the seal support, wherein the seal support comprises a fiber-reinforced plastic and the stripping lining comprises polysiloxane, and wherein the seal support and the stripping lining are prepared in a non-cured state and are arranged in direct contact with one another in accordance with the configuration of the seal arrangement, and are subsequently subjected to a common curing process such that fiber-reinforced plastic and polysiloxane cross-link with one another. The present invention further relates to a correspondingly produced seal arrangement and to a turbomachine having such a seal arrangement.

First claim

What is claimed is:

1. A process for the production of a seal arrangement for a turbomachine, wherein the seal arrangement comprises (i) a seal support comprising a fiber-reinforced plastic and (ii) a stripping lining which is arranged on the seal support and comprises polysiloxane, and wherein the process comprises providing the seal support and the stripping lining in a non-cured state and arranging them in direct contact with one another in accordance with a configuration of the seal arrangement, and subsequently subjecting (i) and (ii) to a common curing process such that fiber-reinforced plastic and polysiloxane cross-link chemically with one another.

2. The process of claim 1 , wherein fibers of the fiber-reinforced plastic comprise one or more of carbon fibers, glass fibers, aramid fibers, polyester fibers, polyvinyl acetate fibers, polypropylene fibers, polyethylene fibers.

3. The process of claim 1 , wherein a matrix material of the fiber-reinforced plastic is a thermoset or a thermoplastic.

4. The process of claim 3 , wherein the matrix material of the fiber-reinforced plastic comprises one or more of a polyimide resin, a phenol resin, a vinyl ester resin, an epoxy resin.

5. The process of claim 1 , wherein the process further comprises molding seal support and stripping lining together in a mold to afford a non-cured semi-finished product.

6. The process of claim 1 , wherein the seal support is produced by transfer molding, pultrusion, a resin injection method or a pre-preg method.

7. The process of claim 1 , wherein the seal support and/or the stripping lining are produced as non-cured semi-finished products, as molded bodies.

8. The process of claim 1 , wherein forming of the seal support and/or of the stripping lining and cross-linking with the stripping lining are carried out in one process step.

9. The process of claim 1 , wherein common curing of the seal support and the stripping lining is carried out at temperatures in a range of from 120° C. to 250° C.

10. The process of claim 8 , wherein common curing of the seal support and the stripping lining is carried out at temperatures in a range of from 120° C. to 250° C.

11. A seal arrangement for a turbomachine, wherein the seal arrangement comprises (i) a seal support comprising a fiber-reinforced plastic and (ii) a stripping lining arranged on the seal support and comprising polysiloxane, the polysiloxane being chemically cross-linked directly with the fiber-reinforced plastic.

12. The seal arrangement of claim 11 , wherein the seal arrangement is at least part of an inner ring of a stator.

13. The seal arrangement of claim 11 , wherein the seal support is formed as a ring or part of a ring and has, in cross section transverse to a circumferential direction of an annular structure, a U-shaped basic shape comprising a base which runs in a circumferential direction and webs which are arranged laterally at axial ends of the base and run radially and in the circumferential direction.

14. The seal arrangement of claim 13 , wherein at the base the stripping lining is arranged over the full area over an entire extent of the seal support in axial direction and circumferential direction.

15. The seal arrangement of claim 13 , wherein the radially oriented webs have, at ends thereof facing away from the base, angle elements having axially and radially oriented sections or axially oriented end strips, the axially oriented sections enclosing, with the radially oriented webs, an annular cavity of rectangular cross section.

16. A turbomachine, wherein the turbomachine comprises the seal arrangement of claim 1 , which seal arrangement is arranged in a transition region between a rotor and a stator.

17. The turbomachine of claim 16 , wherein the turbomachine is a static gas turbine or aircraft engine.

18. The turbomachine of claim 16 , wherein the fibers of the fiber-reinforced plastic are arranged in the seal arrangement such that the fibers enclose, relative to an axis of rotation of the turbomachine or a direction parallel thereto, an acute angle of &el % 30° to 90°.

19. The turbomachine of claim 18 , wherein the fibers enclose an acute angle of from 45° to 90°.

20. The turbomachine of claim 18 , wherein the fibers enclose an acute angle of from 60° to 90°.

Assignees

• MTU Aero Engines AG

Inventors

• Schmid Siegfried
• Schober Michael
• Sikorski Siegfried
• Mattschas Axel
• Bader Robert

Classifications

• F05D2300/603

  Composites; e.g. fibre-reinforced · CPC title

• F05D2300/437

  Silicon polymers · CPC title

• F05D2300/434

  Polyimides, e.g. AURUM · CPC title

• F01D11/02 Primary

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

• F05D2230/40

  Heat treatment · CPC title