Guide vane for rotary turbo machinery

1. A turbine guide vane comprising a guide vane leaf, and a radially outer platform connected to the guide vane leaf and having a platform surface which faces radially away from the guide vane leaf and on which a connecting structure is provided for fastening the guide vane to a supporting structure, the connecting structure has front and rear side wall portions which project radially beyond the platform surface and delimit an inner cavity and on which is provided at least in portions a joining contour which is insertable into a complementary contour within the supporting structure, wherein the front and rear side wall portions each have a seal that extends between the connecting structure and the supporting structure.

2. The guide vane as claimed in claim 1 , wherein the at least one seal is acted upon by spring force and is pressed by the connecting structure against the supporting structure.

3. The guide vane as claimed in claim 2 , wherein the at least one seal is a strip or band seal and has a longitudinal extent, along which the at least one seal is partially acted upon by a spring element.

4. The guide vane as claimed in claim 2 , wherein the at least one seal is a strip or band seal and has a longitudinal extent, along which the at least one seal is acted upon by a spring element.

5. The guide vane as claimed in claim 1 , wherein the at least one seal is a strip or band seal and has a longitudinal extent, along which the at least one seal is partially acted upon by a spring element.

6. The guide vane as claimed in claim 5 , wherein the at least one seal has a sealing surface which is contoured corresponding to a surface region of the supporting structure or of the connecting structure, against which the at least one seal is pressed by the action of the spring force.

7. The guide vane as claimed in claim 1 , wherein the at least one seal provided between the connecting structure and the supporting structure serves for a largely fluid tight closure of the cavity which is delimited by the side wall portions and the supporting structure and into which at least one cooling duct issues from the supporting structure.

8. The guide vane as claimed in claim 1 , wherein the at least one seal is acted upon by spring force and is pressed by the supporting structure against the connecting structure.

9. The guide vane as claimed in claim 1 , wherein the at least one seal is a strip or band seal and has a longitudinal extent, along which the at least one seal is acted upon by a spring element.

10. A turbine guide vane comprising a guide vane leaf, and a radially outer platform connected to the guide vane leaf and having a platform surface which faces radially away from the guide vane leaf and on which a connecting structure is provided for fastening the guide vane to a supporting structure which has side wall portions which project radially beyond the platform surface and delimit an inner cavity and on which is provided at least in portions a joining contour which is insertable into a complementary contour within the supporting structure, wherein at least one seal is provided between the connecting structure and the supporting structure, and the connecting structure has four side wall portions which are assembled into a rectangular frame and of which two opposite side wall portions have overhanging collars as joining contours which are insertable into complementary recesses within the supporting structure, and the at least one seal is provided along each of the other two end-face side wall portions arranged opposite to each other.

11. The guide vane as claimed in claim 10 , wherein the end-face side wall portions each have a radially outer boundary face into which a groove-shaped recess is introduced, and in that at least one spring element and the at least one seal in the form of a band or bar seal adapted to the groove-shaped recess can be inserted into the groove-shaped recess, said at least one seal being prestressed by means of spring force at least partially radially so as to be raised above the boundary face.

12. The guide vane as claimed in claim 11 , wherein the spring element is a band, spiral, helical or round spring.

13. The guide vane as claimed in claim 12 , wherein the at least one seal is mounted so as to be deflectable solely perpendicularly in relation to the surface region of the supporting structure.

14. The guide vane as claimed in claim 11 , wherein the at least one seal is mounted so as to be deflectable solely perpendicularly in relation to the surface region of the supporting structure.

15. The guide vane as claimed in claim 10 , wherein the at least one seal is mounted so as to be deflectable solely perpendicularly in relation to the surface region of the supporting structure.

16. A turbine guide vane comprising a guide vane leaf, and a radially outer platform connected to the guide vane leaf and having a platform surface which faces radially away from the guide vane leaf and on which a connecting structure is provided for fastening the guide vane to a supporting structure which has side wall portions which project radially beyond the platform surface and delimit an inner cavity and on which is provided at least in portions a joining contour which is insertable into a complementary contour within the supporting structure, wherein at least one seal is provided between the connecting structure and the supporting structure, the at least one seal is a strip or band seal and has a longitudinal extent, along which the at least one seal is partially acted upon by a spring element, the at least one seal has a sealing surface which is contoured corresponding to a surface region of the supporting structure or of the connecting structure, against which the at least one seal is pressed by the action of the spring force, and the at least one seal is mounted so as to be deflectable solely perpendicularly in relation to the surface region of the supporting structure.

17. A turbine guide vane comprising a guide vane leaf, and a radially outer platform connected to the guide vane leaf and having a platform surface which faces radially away from the guide vane leaf and on which a connecting structure is provided for fastening the guide vane to a supporting structure which has side wall portions which project radially beyond the platform surface and delimit an inner cavity and on which is provided at least in portions a joining contour which is insertable into a complementary contour within the supporting structure, wherein at least one seal is provided between the connecting structure and the supporting structure, the at least one seal is a strip or band seal and has a longitudinal extent, along which the at least one seal is partially acted upon by a spring element, the at least one seal has a sealing surface which is contoured corresponding to a surface region of the supporting structure or of the connecting structure, against which the at least one seal is pressed by the action of the spring force, and the at least one seal is mounted so as to be deflectable solely perpendicularly in relation to the surface region of the connecting structure.

18. A turbine guide vane comprising a guide vane leaf, and a radially outer platform connected to the guide vane leaf and having a platform surface which faces radially away from the guide vane leaf and on which a connecting structure is provided for fastening the guide vane to a supporting structure which has side wall portions which project radially beyond the platform surface and delimit an inner cavity and on which is provided at least in portions a joining contour which is insertable into a complementary contour within the supporting structure, wherein at least one seal is provided between the connecting structure and the supporting structure, the at least one seal is acted upon by spring force and is pressed by the connecting structure against the supporting structure, and the connecting structure has four side wall portions which are assembled into a rectangular frame and of which two opposite side wall portions have overhanging collars as joining contours which are insertable into complementary recesses within the supporting structure, and the at least one seal is provided along each of the other two end-face side wall portions arranged opposite to each other.

19. A turbine guide vane comprising a guide vane leaf, and a radially outer platform connected to the guide vane leaf and having a platform surface which faces radially away from the guide vane leaf and on which a connecting structure is provided for fastening the guide vane to a supporting structure which has side wall portions which project radially beyond the platform surface and delimit an inner cavity and on which is provided at least in portions a joining contour which is insertable into a complementary contour within the supporting structure, wherein at least one seal is provided between the connecting structure and the supporting structure, the at least one seal is a strip or band seal and has a longitudinal extent, along which the at least one seal is partially acted upon by a spring element, and the connecting structure has four side wall portions which are assembled into a rectangular frame and of which two opposite side wall portions have overhanging collars as joining contours which are insertable into complementary recesses within the supporting structure, and the at least one seal is provided along each of the other two end-face side wall portions arranged opposite to each other.

20. A turbine guide vane comprising a guide vane leaf, and a radially outer platform connected to the guide vane leaf and having a platform surface which faces radially away from the guide vane leaf and on which a connecting structure is provided for fastening the guide vane to a supporting structure which has side wall portions which project radially beyond the platform surface and delimit an inner cavity and on which is provided at least in portions a joining contour which is insertable into a complementary contour within the supporting structure, wherein at least one seal is provided between the connecting structure and the supporting structure, the at least one seal is a strip or band seal and has a longitudinal extent, along which the at least one seal is partially acted upon by a spring element, the at least one seal has a sealing surface which is contoured corresponding to a surface region of the supporting structure or of the connecting structure, against which the at least one seal is pressed by the action of the spring force, and the connecting structure has four side wall portions which are assembled into a rectangular frame and of which two opposite side wall portions have overhanging collars as joining contours which are insertable into complementary recesses within the supporting structure, and the at least one seal is provided along each of the other two end-face side wall portions arranged opposite to each other.