GUIDE VANE PLATE WITH A CHAMFERED AND A CYLINDRICAL EDGE REGION

Abstract

A guide vane (10, 10′) according to the invention for a guide vane ring of a turbomachine has a vane element as well as a guide vane plate (12) for its support on an inner ring (20). The guide vane plate has a cover surface (14) facing the vane element, a base surface (17) lying opposite to the cover surface, and an edge surface (15) joining the cover and base surfaces. In a first region (B.sub.1), the edge surface forms a chamfer (16) of the vane plate, and in a second region (B.sub.2), which forms the edge of a sector of the guide vane plate that is different from that of the first region (B.sub.1), the edge surface runs along a cylindrical surface. A method comprises inserting a plurality of guide vanes (10, 10′) according to the invention into respective uptakes (21) in an inner ring (20).

Claims

1. A guide vane (10, 10′) for a guide vane ring of a turbomachine, comprising a vane element as well as a vane plate (12) for its support on an inner ring (20), wherein the guide vane plate has a cover surface (14) facing the vane element, a base surface (17) lying opposite to the cover surface, and an edge surface (15) joining the cover and base surfaces, wherein the edge surface forms a chamfer (16) of the vane plate in a first region (B.sub.1) and runs along a cylindrical surface in a second region (B.sub.2), and wherein the first region (B.sub.1) of the edge surface forms the edge of a sector of the guide vane plate that is different from the second region (B.sub.2).

2. The guide vane according to claim 1, wherein the edge surface (15) has an angle of rotation (α) that lies in a range of 20° to 170° in the first region (B.sub.1).

3. The guide vane according to claim 1, wherein the edge surface has an angle of rotation (β) of at least 180° in the second region (B.sub.2).

4. The guide vane according to claim 1, further comprising: a bearing journal (13) extending in the longitudinal direction of the guide vane at the base surface (17) of the guide vane plate (12).

5. The guide vane according to claim 1, having a guide vane ring with an inner ring (20) and at least one guide vane (10, 10′) which is inserted into an associated uptake in the inner ring.

6. The guide vane according to claim 5, wherein the edge surface of the at least one guide vane (10, 10′) is snuggled flat against the wall of the associated uptake in the second region (B.sub.2).

7. The guide vane according to claim 1, wherein a plurality of guide vanes (10, 10′) are inserted into respective uptakes (21) in an inner ring (20), wherein each of the guide vanes is temporarily brought into a position that is inclined relative to the respective uptake during the insertion, a position in which a base surface (17) of a guide vane plate (12) of the guide vane being inserted is oblique relative to a bottom surface of the uptake.

8. The guide vane according to claim 7, wherein, in the inclined position, a region (B.sub.1) of the vane plate, in which the edge surface thereof has a chamfer, projects further into the uptake than a region (B.sub.2) of the vane plate, in which the edge surface thereof is formed along a cylindrical surface.

9. The guide vane according to claim 7, wherein, in the inclined position, a region (B.sub.2) of the vane plate, in which the edge surface thereof is formed along a cylindrical surface, projects further into the uptake than a region (B.sub.1) of the vane plate, in which the edge surface thereof has a chamfer.

Description

[0028] Herein, shown schematically:

[0029] FIG. 1: a part of a guide vane with an inner guide vane plate according to the invention and

[0030] FIG. 2: a guide vane according to the invention, considered from the inner guide vane plate in the direction of a longitudinal axis of a guide vane.

[0031] A section of a guide vane 10, which is inserted in a pivotable manner around a longitudinal axis A into an uptake 21 of an inner ring 20 (shown only in a section), is illustrated in a perspective illustration in FIG. 1. For better understanding, in this case, a view into the uptake 21 is shown in the illustration; the uptake is formed here as a straight circular cylinder, its central axis extending into the inner ring in the radial direction (of the inner ring).

[0032] The guide vane 10 has a vane element 11 and a guide vane plate 12. The guide vane plate 12 has a diameter D and an average thickness (or height) H (as the length of the section of the longitudinal axis A running between the cover surface and the base surface in the guide vane plate), which is smaller than the diameter. The guide vane plate further has a cover surface 14 facing the vane element 11, a base surface which is covered up in FIG. 1, and an edge surface 15 joining the cover surface and the base surface. In the example shown, the cover surface and the base surface are designed inclined relative to one another; in alternative embodiments, these surfaces can lie parallel to one another.

[0033] In a first region B.sub.1 the edge surface 15 forms a chamfer 16, in which the guide vane plate tapers in the direction to the base surface. The chamfer 16 makes possible an inclination of the guide vane relative to the uptake 21 in the inner ring 20 in the direction of the region B.sub.1 during the insertion of the guide vane plate into the uptake 21. This simplifies the threading of the guide vane, which is mounted in advance in the outer housing, into the uptake 21.

[0034] Due to the chamfer 17, a cavity 30 that promotes leakage is found, of course, between the inner wall of uptake 21 and the edge surface 15 in the region B.sub.1. In order to minimize this leakage, the guide vane plate according to the invention is designed so that the edge region runs in a second region B.sub.2 along a cylindrical surface. In this way, it snuggles against the correspondingly shaped wall of the uptake 21 so that the intermediate space and thus the leakage are minimized in this region.

[0035] FIG. 2 shows an alternative guide vane 10′ that has a vane element 11 and a guide vane plate 12. The guide vane plate has a base surface 17 on its side facing away from the vane element 11, and FIG. 2 shows the guide vane 10′ in a perspective from the base surface 17 in the direction of a longitudinal axis of the guide vane 10′ (referred to an inner ring, into which the guide vane is to be inserted, thus radially outward).

[0036] An edge surface 16, which joins together the base surface 17 and the cover surface of the guide vane plate, forms a chamfer in a first region B.sub.1 by which the guide vane plate 12 tapers in the direction to the base surface 17. In a second region B.sub.2, in contrast, the edge surface 15 runs along a cylindrical surface. In this way, any leakage can be kept small after the guide vane plate has been inserted into a correspondingly cylindrically shaped uptake of an inner ring.

[0037] The first region B.sub.1 and the second region B.sub.2 form edges of sectors of the guide vane plate 12 that are different from one another. In the first region B.sub.1, the edge surface has an angle of rotation α, which is smaller than 180°; in the second region B.sub.2, in contrast, the edge surface has an angle of rotation β, which is greater than 180°, wherein, in the example shown, β=360°−α.

[0038] On the base surface 17 of the guide vane plate, the guide vane 10′ has a bearing journal 13, which extends cylindrically in the direction of the longitudinal axis of the guide vane; in FIG. 2, only a base surface of the bearing journal can be seen due to the perspective. The diameter d thereof is smaller than the diameter D of the guide vane plate 12.

[0039] A guide vane 10, 10′ according to the invention for a guide vane ring of a turbomachine has a vane element as well as a guide vane plate 12 for its support on an inner ring 20. The guide vane plate has a cover surface 14 facing the vane element, a base surface 17 lying opposite to the cover surface, and an edge surface 15 joining the cover and base surfaces. In a first region B.sub.1, the edge surface forms a chamfer 16 of the vane plate, and in a second region B.sub.2, which forms the edge of a sector of the guide vane plate that is different from that of the first region B.sub.2, the edge surface runs along a cylindrical surface.

[0040] A method according to the invention serves for assembling a guide vane ring. It comprises an insertion of a plurality of guide vanes 10, 10′ according to the invention into respective uptakes 21 in an inner ring 20. In this case, each of the guide vanes is temporarily brought into an inclined position relative to the respective uptake.

REFERENCE CHARACTERS

[0041] 10, 10′ Guide vane [0042] 11 Vane element [0043] 12 Guide vane plate [0044] 13 Journal or pin [0045] 14 Cover surface [0046] 15 Edge surface [0047] 16 Chamfer [0048] 17 Base surface [0049] 20 Inner ring [0050] 21 Uptake [0051] A Longitudinal axis of the guide vane [0052] B.sub.1 First region of the edge surface [0053] B.sub.2 Second region of the edge surface [0054] d Diameter of the bearing journal [0055] D Diameter of the guide vane plate [0056] H Average thickness of the guide vane plate [0057] α Angle of rotation of the first region [0058] β Angle of rotation of the second region