Stator vane adjusting device of a gas turbine

Patent metadata

Field	Value
Publication number	US-9976438-B2
Application number	US-201514861616-A
Country	US
Kind code	B2
Filing date	Sep 22, 2015
Priority date	Sep 26, 2014
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A stator vane adjusting device of a gas turbine having a plurality of stator vanes each swivellable about a radial axis and arranged in at least one radial plane, as well as at least one stator vane adjusting ring which is connected to the respective stator vanes and rotatable in the circumferential direction by means of an actuating device, where the stator vane adjusting ring is braced on a centrally arranged casing in the radial direction by means of several spacers distributed about the circumference and mounted on the stator vane adjusting ring, characterized in that a bush on which the spacer is mounted is fastened to the stator vane adjusting ring for each spacer, the bush being made from a plastic material with a high thermal expansion coefficient.

First claim

What is claimed is:

1. A stator vane adjusting device of a gas turbine having a plurality of stator vanes each swivellable about a radial axis and arranged in at least one radial plane, comprising:
a stator vane adjusting ring connected to the plurality of stator vanes and rotatable in a circumferential direction by an actuating device,
a plurality of spacers distributed about a circumference of the stator vane adjusting ring and mounted on the stator vane adjusting ring for bracing the stator vane adjusting ring in a radial direction on a centrally arranged casing of the gas turbine,
for each of the plurality of spacers, a bush for mounting the spacer, the bush being fastened to the stator vane adjusting ring at a first position of the bush, the bush being made from a plastic or composite material with a higher thermal expansion coefficient than a thermal expansion coefficient of the stator vane adjusting ring, the spacer mounted to the bush at a second position of the bush radially outwardly of the first position of the bush such that, during operation of the gas turbine, the higher thermal expansion coefficient of the bush causes the spacer to move radially outwardly with respect to the stator vane adjusting ring;
the spacer including a radially outwardly facing portion positioned directly radially inwardly of an inwardly facing portion of the bush, the spacer mounted to the bush such that the radially outwardly facing portion of the spacer is spaced radially inwardly apart from the radially inwardly facing portion of the bush such that the radially outwardly facing portion of the spacer does not engage the radially inwardly facing portion of the bush and radially outward movement of the radially outwardly facing portion of the spacer is not limited by the radially inwardly facing portion of the bush during the operation of the gas turbine.

2. The stator vane adjusting device in accordance with claim 1 , wherein the bush is tubular and the spacer has a shaft centrally fastened inside the bush.

3. The stator vane adjusting device in accordance with claim 2 , wherein the shaft is connected to the bush by a threaded connection.

4. The stator vane adjusting device in accordance with claim 3 , wherein the bush is fastened to a radially inner side of the stator vane adjusting ring.

5. The stator vane adjusting device in accordance with claim 4 , wherein the shaft is adjustable relative to the bush in the radial direction.

6. The stator vane adjusting device in accordance with claim 5 , wherein the shaft is made from a metallic material having a similar or same thermal expansion coefficient as at least one chosen from the casing and the stator vane adjusting ring.

7. The stator vane adjusting device in accordance with claim 6 , wherein the thermal expansion coefficient of the bush is higher than a thermal expansion coefficient of at least one chosen from the spacer and the casing.

8. The stator vane adjusting device in accordance with claim 7 , wherein the thermal expansion coefficient of the bush is at least double the thermal expansion coefficient of at least one chosen from the stator vane adjusting ring, the spacer and the casing.

9. The stator vane adjusting device in accordance with claim 8 , wherein the bush is made of polyimide.

10. The stator vane adjusting device in accordance with claim 9 , wherein the stator vane adjusting ring and the spacer and the casing are manufactured from a high-strength steel alloy or from a titanium alloy.

11. The stator vane adjusting device in accordance with claim 1 , wherein the bush is fastened to a radially inner side of the stator vane adjusting ring.

12. The stator vane adjusting device in accordance with claim 2 , wherein the shaft is adjustable relative to the bush in the radial direction.

13. The stator vane adjusting device in accordance with claim 2 , wherein the shaft is made from a metallic material having a similar or same thermal expansion coefficient as at least one chosen from the casing and the stator vane adjusting ring.

14. The stator vane adjusting device in accordance with claim 13 , wherein the thermal expansion coefficient of the bush is higher than a thermal expansion coefficient of at least one chosen from the spacer and the casing.

15. The stator vane adjusting device in accordance with claim 13 , wherein the thermal expansion coefficient of the bush is at least double the thermal expansion coefficient of at least one chosen from the stator vane adjusting ring, the spacer and the casing.

16. The stator vane adjusting device in accordance with claim 1 , wherein the thermal expansion coefficient of the bush is higher than a thermal expansion coefficient of at least one chosen from the spacer and the casing.

17. The stator vane adjusting device in accordance with claim 1 , wherein the thermal expansion coefficient of the bush is at least double the thermal expansion coefficient of at least one chosen from the stator vane adjusting ring, the spacer and the casing.

18. The stator vane adjusting device in accordance with claim 1 , wherein the bush is made of polyimide.

19. The stator vane adjusting device in accordance with claim 1 , wherein the stator vane adjusting ring and the spacer and the casing are manufactured from a high-strength steel alloy or from a titanium alloy.

Assignees

• Rolls Royce Deutschland Ltd & Co Kg
• Rolls Royce Detschland Ltd & Co Kg

Inventors

• Klauke Thomas

Classifications

• F01D9/041

  using blades (F01D5/148 takes precedence) · CPC title

• F04D29/563

  specially adapted for elastic fluid pumps · CPC title

• F05D2300/603

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

• F05D2260/31

  Retaining bolts or nuts · CPC title

• F01D17/14 Primary

  varying effective cross-sectional area of nozzles or guide conduits · CPC title