Stator assembly for a gas turbine engine
A stator assembly for a gas turbine engine includes: (a) an outer shroud having a circumferential array of outer slots; (b) an inner shroud having a circumferential array of inner slots; (c) a plurality of airfoil-shaped vanes extending between the inner and outer shrouds, each vane having inner and outer ends which are received in the inner and outer slots; and (d) an annular, resilient retention ring spring which engages the inner ends of the vanes and urges them in a radially inward direction.
1. A stator assembly for a gas turbine engine, comprising:
(a) an outer shroud having a circumferential array of outer slots;
(b) an inner shroud having a circumferential array of inner slots;
(c) a plurality of airfoil-shaped vanes extending between the inner and outer shrouds, each vane having inner and outer ends which are received in the inner and outer slots, respectively, wherein each of the vanes has an overhanging platform disposed at its outer end, which is substantially larger in cross-sectional area than the corresponding outer slot; and
(d) an annular, resilient retention ring spring which engages the inner ends of the vanes and urges them in a radially inward direction.
2. The stator assembly of claim 1 wherein the retention ring has a generally flatted sinusoidal shape in a plane perpendicular to a central axis of the stator assembly.
3. A stator assembly for a gas turbine engine, comprising:
(a) an outer shroud having a circumferential array of outer slots;
(b) an inner shroud having a circumferential array of inner slots;
(c) a plurality of airfoil-shaped vanes extending between the inner and outer shrouds, each vane having inner and outer ends which are received in the inner and outer slots, respectively; and
(d) a resilient, non-metallic grommet disposed between the outer end of each of the vanes and the respective outer slot; and
(e) an annular, resilient retention ring spring which engages the inner ends of the vanes and urges them in a radially inward direction.
4. The stator assembly of claim 3 wherein the grommet comprises fluorocarbon or fluorosilicone elastomer.
5. A stator assembly for a gas turbine engine, comprising:
(a) an outer shroud having a circumferential array of outer slots;
(b) an inner shroud having a circumferential array of inner slots;
(c) a plurality of airfoil-shaped vanes extending between the inner and outer shrouds, each vane having inner and outer ends which are received in the inner and outer slots, respectively, wherein each vane includes a hook disposed at its inner end which engages the retention ring; and
(d) an annular, resilient retention ring spring which engages the inner ends of the vanes and urges them in a radially inward direction.
6. The stator assembly of claim 5 further including an annular, resilient, non-metallic filler block disposed in a inner cavity of the inner shroud, such that it encapsulates the hooks and the retention ring.
7. The stator assembly of claim 6 wherein the filler block comprises fluorocarbon or fluorosilicone elastomer.
8. A stator assembly for a gas turbine engine, comprising:
(a) an outer shroud having a circumferential array of outer slots;
(b) an inner shroud having a circumferential array of inner slots;
(c) a plurality of airfoil-shaped vanes extending between the inner and outer shrouds, each vane having inner and outer ends which are received in the inner and outer slots, respectively, wherein the retention ring has a corrugated shape.
9. A method of assembling a stator assembly for a gas turbine engine, comprising:
(a) providing an outer shroud having a circumferential array of outer slots;
(b) providing an inner shroud having a circumferential array of inner slots;
(c) inserting a plurality of airfoil-shaped vanes through the inner and outer slots;
(d) inserting a resilient, non-metallic grommet between the outer end of each of the vanes and the respective outer slot; and
(e) engaging the inner ends of the vanes with a resilient retention ring which urges them in a radially inward direction.
10. The method of claim 9 wherein each of the vanes has an overhanging platform disposed at its outer end, which is substantially larger in cross-sectional area than the corresponding outer slot.
11. The method of claim 10 wherein the grommet comprises silicone rubber.
12. The method of claim 9 wherein the retention ring has a corrugated shape.
13. The method of claim 9 wherein the retention ring has a generally flatted sinusoidal shape in a plane perpendicular to a central axis of the stator assembly.
14. A method of assembling a stator assembly for a gas turbine engine, comprising:
(a) providing an outer shroud having a circumferential array of outer slots;
(b) providing an inner shroud having a circumferential array of inner slots;
(c) inserting a plurality of airfoil-shaped vanes through the inner and outer slots; and
(d) engaging a hook disposed at the inner end of each vane with a resilient retention ring retention ring which urges them in a radially inward direction.
15. The method of claim 14 further comprising installing an annular, resilient, non-metallic filler block in a inner cavity of the inner shroud, such that it encapsulates the hooks and the retention ring.
16. The method of claim 15 wherein the filler block is installed by: (a) applying an uncured material in flowable form to the inner cavity; and (b) curing the material so as to solidify it.
17. The method of claim 15 wherein the filler block comprises fluorocarbon or fluorosilicone elastomer.