Guiding device of a flow machine and guide vane for such a guiding device
View Patent ↗A guide device for a turbomachine, particularly a steam turbine, with a guide vane ring and a plurality of guide vanes which are fastened to the guide vane ring so as to be distributed along the circumference of the guide vane ring. The guide vane ring has a groove, and the guide vanes also have grooves which are aligned with the groove of the guide vane ring in the assembled state. The guide vanes are fixed in their radial position at the guide vane ring by means of a retaining ring which engages in the groove of the guide vane ring and in the grooves of the guide vanes.
1. A guide device for a turbomachine, comprising:
a guide vane ring having a groove;
a plurality of guide vanes, each of the plural guide vanes having a groove, the plural guide vanes fastened to the guide vane ring and distributed along a circumference of the guide vane ring, wherein the guide vane grooves are aligned with the guide vane ring groove; and
a retaining ring engaged in each of the guide vane grooves and the guide vane ring groove, the retaining ring fixing each of the plural guide vanes in a radial position on the guide vane ring.
2. The guide device according to claim 1 , wherein
the groove of the guide vane ring is on a lateral side of the guide vane ring,
each of the grooves of the plural guide vanes are on a lateral side of the guide vanes on one side of the plural guide vanes, and
the retaining ring is adapted for insertion in an axial direction into the groove of the guide vane ring and into each groove of the plural guide vanes.
3. The guide device according to claim 2 , further comprising a guide vane carrier, wherein the guide vane ring is fastened to the guide vane carrier and the plural guide vanes, each of the plural guide vanes fixed to the guide vane ring in a respective radial position.
4. The guide device according to claim 3 , wherein the guide vane ring is fastened to the guide vane carrier by at least one screw.
5. The guide device according to claim 4 , wherein the at least one screw engages the guide vane carrier by a screw shaft and a screw head partially overlap the guide vane carrier, the guide vane ring, and the retaining ring.
6. The guide device according to claim 1 , wherein the groove of the guide vane ring and each of the grooves of the plural guide vanes are arc-shaped.
7. The guide vane according to claim 6 , wherein the groove of the guide vane ring and each of the grooves of the plural guide vanes are each circular-arc-shaped.
8. The guide device according to claim 1 , wherein a radial inner boundary surface and a radial outer boundary surface of the groove of the guide vane ring and each of the grooves of the plural guide vanes are at a distance of between 3 mm and 9 mm.
9. The guide device according to claim 8 , wherein a radial inner boundary surface and a radial outer boundary surface of the groove of the guide vane ring and each of the grooves of the plural guide vanes are flat.
10. The guide device according claim 8 , wherein a radial inner boundary surface and a radial outer boundary surface of the groove of the guide vane ring and each of the grooves of the plural guide vanes are each shaped as at least one of a section of a cylindrical, conical, and toroidal surface.
11. The guide device according to claim 8 , wherein a radial inner boundary surface and a radial outer boundary surface of the groove of the guide vane ring and each of the grooves of the plural guide vanes are at a distance of between 4 mm and 8 mm.
12. The guide device according to claim 1 , wherein the groove is incorporated in the guide vane ring by turning or milling and grooves are incorporated in the each of the plural guide vanes by shaping or milling.
13. The guide device according to claim 12 , wherein the grooves are incorporated in the each of the plural guide vanes before fitting the guide vanes to the guide vane ring.
14. The guide device according to claim 12 , wherein the grooves are incorporated in the each of the plural guide vanes after fitting the guide vanes to the guide vane ring.
15. The guide device according to claim 1 , wherein the groove is incorporated in the guide vane ring by turning or milling and the grooves of each of the plural guide vanes are incorporated in the guide vanes jointly by turning or milling prior to fitting the guide vanes to the guide vane ring.
16. The guide vane or guide device according to claim 1 , further comprising an arc-shaped groove in a radial outer end of the guide vane.
17. The guide vane according to claim 16 , wherein a radial inner boundary surface of the groove and a radial outer boundary surface of the arc-shaped groove are at a distance of between 3 mm and 9 mm.
18. The guide vane according to claim 16 , wherein a radial inner boundary surface of the groove and a radial outer boundary surface of the arc-shaped groove are flat.
19. The guide vane according to claim 16 , wherein a radial inner boundary surface of the arc-shaped groove and a radial outer boundary surface of the arc-shaped groove are shaped as sections of at least one of a cylindrical, conical, and toroidal surface.
20. The guide vane according to claim 1 , wherein the turbomachine is a steam turbine.
21. A method for producing guide device for a turbomachine, the guide device comprising:
a guide vane ring having a groove;
a plurality of guide vanes, each of the plural guide vanes having a groove, the plural guide vanes fastened to the guide vane ring and distributed along a circumference of the guide vane ring, wherein the guide vane grooves are aligned with the guide vane ring groove; and
a retaining ring engaged in each of the guide vane grooves and the guide vane ring groove, the retaining ring fixing each of the plural guide vanes in a radial position on the guide vane ring, wherein the method comprises:
at least one turning and milling the groove in the guide vane ring; and
at least one of shaping grooves in the each of the plural guide vanes, milling grooves in the each of the plural guide vanes, milling the grooves of each of the plural guide vanes prior to fitting the guide vanes to the guide vane ring, and turning the grooves of each of the plural guide vanes prior to fitting the guide vanes to the guide vane ring.