ADJUSTABLE GUIDE VANE FOR TURBOMACHINE

Abstract

Disclosed is an adjustable guide vane for a turbomachine, especially for a turbine stage or compressor stage of a gas turbine, which comprises a vane airfoil for deflecting a working fluid of the turbomachine and which is produced at least partially from a second material, and at least one first vane section which is produced from a first material which is different from the second material.

Claims

1. An adjustable guide vane for a turbomachine, wherein the vane comprises a vane airfoil, produced at least partially from a second material, for deflecting a working fluid of the turbomachine and, and at least one first vane section produced from a first material which is different from the second material.

2. The adjustable guide vane of claim 1, wherein the vane comprises two first vane sections which are arranged on sides of the vane airfoil which are opposite each other, at least one of the first vane sections being produced from the first material which is different from the second material.

3. The adjustable guide vane of claim 1, wherein the second material features metal and/or a superalloy and/or is resistant to high heat.

4. The adjustable guide vane of claim 1, wherein the first material features metal and/or no superalloy and/or is not resistant to high heat.

5. The adjustable guide vane of claim 1, wherein a yield limit or 0.2% offset yield strength of the second material is at least about 1.1 times a yield limit or 0.2% offset yield strength of the first material.

6. The adjustable guide vane of claim 1, wherein a density of the second material is at least about 1.1 times a density of the first material.

7. The adjustable guide vane of claim 1, wherein a density of the second material is at least about 1.5 times a density of the first material.

8. The adjustable guide vane of claim 1, wherein at least one first vane section is machined by cutting and/or has at least one thread.

9. The adjustable guide vane of claim 8, wherein the at least one first vane section is produced from the first material.

10. The adjustable guide vane of claim 1, wherein at least one first vane section is joined in a materially bonding manner

11. The adjustable guide vane of claim 10, wherein the at least one first vane section is produced from the first material.

12. The adjustable guide vane of claim 10, wherein the at least one first vane section is joined by welding.

13. The adjustable guide vane of claim 1, wherein at least one first vane section comprises a radial end and/or at least a part of a bearing surface and/or of an interface for connection of an adjustment device for adjusting the guide vane.

14. The adjustable guide vane of claim 13, wherein the at least one first vane section is produced from the first material.

15. The adjustable guide vane of claim 1, wherein at least one first vane section adjoins an end face or platform which delimits the vane airfoil or adjoins a second vane section which is arranged on a side of the end face or platform which is opposite the vane airfoil.

16. The adjustable guide vane of claim 15, wherein the at least one first vane section is produced from the first material.

17. The adjustable guide vane of claim 15, wherein the platform and/or the second vane section is produced at least partially from the second material.

18. The adjustable guide vane of claim 17, wherein the platform and/or the second vane section is produced integrally with the vane airfoil.

19. A turbomachine, wherein the turbomachine comprises a casing, at least one adjustable guide vane according to claim 1 that is adjustably mounted in the casing, and an adjustment device which is connected thereto for adjusting the guide vane.

20. A method for producing the adjustable guide vane of claim 1, wherein the method comprises producing the vane airfoil from the second material; producing at least one first vane section from the first material, and connecting the vane airfoil in a materially bonding manner to the at least one first vane section.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0049] Further advantageous refinements of the present invention are gathered from the dependent claims and from the following description of preferred embodiments. For this purpose, partially schematized in the single drawing:

[0050] FIG. 1 shows an adjustable guide vane of a turbomachine according to an embodiment of the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

[0051] The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description in combination with the drawing making apparent to those of skill in the art how the several forms of the present invention may be embodied in practice.

[0052] FIG. 1 shows an adjustable guide vane of a turbomachine according to an embodiment of the present invention.

[0053] This adjustable guide vane has a vane airfoil 1 for deflecting a working fluid of the turbomachine and also an upper or radially outer hearing region 2 and a lower or radially inner bearing region 4 for the adjustable mounting of the guide vane in a casing (not shown) of the turbomachine, which bearing regions are arranged on sides of the vane airfoil 1 which are radially (vertically in FIG. 1) opposite each other.

[0054] The vane airfoil 1 and also these delimiting platforms 12, 14 and a second vane section 6, which radially and directly adjoins the radially outer platform 12, are produced integrally from a second material, especially from a high heat-resistant superalloy.

[0055] A radially inner first vane section in the form of the radially inner bearing region 4 and also a radially outer first vane section 5, which together with the second vane section 6 forms the circumferential bearing surface of the radially outer bearing region 2 and also has an interface adjoining it for connecting to an adjustment device 3 for adjusting the guide vane and a radially outer end of the guide vane with a thread upon which a nut 8 is screwed for the fastening of the adjustment device 3, are produced in each case from a first material which is different from the second material, especially from a material which compared with the high heat-resistant superalloy has better cuttability and/or a lower specific weight. In one variation, the radially inner or outer first vane section can also be produced from the second material or from a third material which is different from the first and second materials.

[0056] In a materially bonding manner, by friction welding, the radially inner first vane section 4 is joined to the radially inner platform 14 and the radially outer first vane section 5 is joined at a joining point 7 to the second vane section 6.

[0057] Although in the preceding description exemplary embodiments were explained, reference may be made to the fact that a large number of variations are possible. Reference may also be made to the fact that the exemplary embodiments are only examples which are in no way intended to limit the extent of protection, the applications and the construction. Rather, as a result of the preceding description a guideline is given to the person skilled in the art for the implementation of at least one exemplary embodiment, wherein diverse modifications, especially with regard to the function and arrangement of the described components, can be undertaken without departing from the extent of protection as gathered from the claims and these equivalent feature combinations.

LIST OF REFERENCE NUMERALS

[0058] 1 Vane airfoil

[0059] 2 Radially outer bearing region

[0060] 3 Adjustment device

[0061] 4 Radially inner bearing region

[0062] 5 Radially outer first vane section

[0063] 6 Second vane section

[0064] 7 Joining point

[0065] 8 Nut