Stator vane segment of a fluid flow machine and turbine

Abstract

A stator vane segment (100) of a fluid flow machine, having an upstream casing-side attachment (1) and/or a downstream casing-side attachment (3), and a platform (5). The attachments are provided on the platform (5). The platform (5) has a first sealing section (17) and extends in the direction of flow beyond a connection region (15) that connects the rearward attachment (3) to the platform (5). The first sealing section (17) that is located in a section (18) downstream of the connection region (15) has a first slot (19) which is continuous in the circumferential direction. The present invention also relates to a turbine having at least one stator vane segment (100).

Claims

1. A stator vane segment of a fluid flow machine, the stator vane segment comprising: a downstream casing-side attachment; and a platform, the downstream attachment being provided on the platform, the platform having a first sealing section and extending in the direction of flow beyond a connection region connecting the downstream attachment to the platform, the first sealing section located in a section downstream of the connection region having a first slot, the first slot being continuous in the circumferential direction and forming a passage through said section in the circumferential direction.

2. The stator vane segment as recited in claim 1 further comprising an upstream casing-side attachment provided on the platform.

3. The stator vane segment as recited in claim 2 wherein the upstream attachment has a second sealing section, and the downstream attachment has a third sealing section.

4. The stator vane segment as recited in claim 3 wherein at least one of the first, second and third sealing section is adapted for insertion of sealing plates or have sealing plates.

5. The stator vane segment as recited in claim 1 wherein the first sealing section is adapted for insertion of sealing plates or have sealing plates.

6. The stator vane segment as recited in claim 1 wherein the platform and the first sealing section extend beyond an airfoil trailing edge of a stator vane in the direction of flow downstream of the connection region.

7. The stator vane segment as recited in claim 1 wherein the section of the platform downstream of the connection region has a second slot radially continuous outwardly and/or inwardly.

8. The stator vane segment as recited in claim 1 wherein the section of the platform downstream of the connection region has a third slot continuous in the circumferential direction.

9. The stator vane segment as recited in claim 1 wherein the section of the platform downstream of the connection region has a tapered wall thickness in a portion thereof.

10. The stator vane segment as recited in claim 1 wherein the stator vane segment has at least two stator vanes.

11. The stator vane segment as recited in claim 1 wherein the stator vane segment is manufactured as a casting.

12. A turbine comprising at least one stator vane segment as recited in claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention will now be described, by way of example only, with reference to the accompanying drawings, in which identical or similar components are indicated by the same reference numerals. The figures are simplified schematic views in which:

(2) FIG. 1 is a perspective view of a portion of a stator vane segment according to the present invention;

(3) FIG. 2 is another perspective view of the stator vane segment according to the present invention shown in FIG. 1;

(4) FIG. 3a is a detail of a perspective view of another stator vane segment according to the present invention having a first slot;

(5) FIG. 3b is another perspective view of the stator vane segment according to the present invention shown in FIG. 3a;

(6) FIG. 3c is a perspective view of the stator vane segment according to another embodiment of the present invention.

(7) FIG. 4a is a detail of a perspective view of yet another stator vane segment according to the present invention; and

(8) FIG. 4b is another perspective view of the further stator vane segment according to the present invention shown in FIG. 4a.

DETAILED DESCRIPTION

(9) FIG. 1 shows in perspective view a portion of a stator vane segment 100 according to the present invention.

(10) The stator vane segment 100 according to the present invention has an upstream casing-side attachment means 1, a downstream casing-side attachment means 3, a platform 5, as well as three stator vanes 200.

(11) Each stator vane 200 has a pressure side 7, a rear suction side 9 (concealed), a stator vane leading edge 11, as well as a stator vane trailing edge 13.

(12) A connection region 15 connects rearward attachment means 3 to platform 5, which merge into one another in connection region 15.

(13) FIG. 1 further shows a first sealing section 17, which extends into a section 18 downstream of connection region 15. In section 18, first sealing section 17 is configured or formed as a first slot 19. First slot 19 is continuous in circumferential direction z.

(14) In addition to first sealing section 17 in platform 5, stator vane array or segment 100 has a second sealing section 17a in upstream attachment means 1, as well as a third sealing section 17b in downstream attachment means 3.

(15) Sealing sections 17, 17a, 17b allow insertion of sealing plates therein. These sealing plates allow the points of connection or abutment to further sealing sections in adjacent stator vane segments (not shown in FIG. 1) to be bridged and thereby sealed. In addition to the function of sealing the flow passage between the stator vanes, these sealing plates may also perform a thermal sealing function, or thermal insulation, in the form of a heat shield. Thus, the sealing plates may perform an integral function with respect to the flow-related and temperature-related sealing function between the flow passage and the casing.

(16) The sealing plate that is inserted into first sealing section 17 may extend into section 19 of platform 5. In the circumferential direction of first slot 19, this sealing plate may extend either only across a part of the total slot depth (e.g., corresponding to the depth of first sealing section 17 in the circumferential direction), across the total slot depth, or beyond the total slot depth. The stiffness of section 18 is affected accordingly. For example, for a smaller sealing plate depth in the circumferential direction, the stiffness is lower.

(17) FIG. 2 shows the inventive stator vane segment 100 of FIG. 1 in another perspective view.

(18) In section 18, first slot 19 is continuous in circumferential direction z.

(19) FIG. 3a shows a detail of a perspective view of another inventive stator vane segment 100 having a second slot 20 which is continuous and open in both radial direction y and circumferential direction z.

(20) FIG. 3b shows the further inventive stator vane segment 100 of FIG. 3a in another perspective view.

(21) FIG. 3c shows another embodiment of the present invention in which the stator vane includes a first slot 19, a second slot 20, and a third slot 24.

(22) FIG. 4a shows a detail of a perspective view of yet another stator vane segment 100 according to the present invention.

(23) First slot 19 extends less far into section 18 in the direction of flow x as compared to its extension in FIG. 1 and FIG. 2. Due to this shortening, the wall thickness 21 in radial direction y is smaller than the wall thickness 23 with slot 19. This makes it possible to advantageously reduce the stiffness of section 18.

(24) FIG. 4b shows another perspective view of the further inventive stator vane segment 100 of FIG. 4a.

LIST OF REFERENCE NUMERALS

(25) TABLE-US-00001 Reference Numeral Description 100 stator vane segment 200 stator vane x direction of flow, axial direction y radial direction z circumferential direction 1 upstream, forward casing-side attachment means 3 downstream, rearward casing-side attachment means 5 platform 7 pressure side of the stator vane 9 suction side of the stator vane 11 stator vane leading edge 13 stator vane trailing edge 15 connection region that connects the rearward attachment means to the platform 17 first sealing section 17a, 17b second/third sealing sections 18 section of the platform downstream of the connection region 19 first slot 20 second slot 21 wall thickness in the radial direction without sealing section 23 wall thickness in the radial direction with sealing section 24 Third Slot