Air turbine starter
An air turbine starter for starting an engine includes a starter housing defining an inlet, an outlet, and a flow path extending between the inlet and the outlet. A turbine section is located within the starter housing and includes a turbine member having a central disk and a set of airfoils spaced circumferentially about the central disk, as well as a sealing structure located within the starter housing.
1. An air turbine starter for starting an engine, comprising:
a starter housing defining an inlet, an outlet, and a flow path extending between the inlet and the outlet; and
a turbine section located within the starter housing for rotatably extracting mechanical power from a flow of gas through the flow path, the turbine section comprising:
a turbine member comprising a central disk and a set of airfoils spaced circumferentially about the central disk;
a sealing structure located within the starter housing; and
a fastener closing the sealing structure, the fastener comprising a threaded bolt with a first end comprising a head with a cutting face confronting the central disk of the turbine member.
2. The air turbine starter of claim 1 wherein the sealing structure comprises a seal housing and a seal located adjacent the seal housing.
3. The air turbine starter of claim 2 wherein the fastener is configured to secure the seal housing to the starter housing, with the seal positioned between the seal housing and the starter housing.
4. The air turbine starter of claim 3 wherein the fastener comprises a threaded second end opposite the first end, and wherein the threaded second end is threaded into the seal housing.
5. The air turbine starter of claim 1 wherein the cutting face is positioned in axial alignment with the central disk of the turbine member.
6. The air turbine starter of claim 5 wherein the cutting face is configured to release at least a portion of the turbine member during an imbalance condition.
7. The air turbine starter of claim 6 wherein the released portion of the turbine member comprises the set of airfoils and a portion of the central disk.
8. The air turbine starter of claim 1 , further comprising an operative spacing distance defined between the cutting face and the central disk.
9. The air turbine starter of claim 8 wherein the operative spacing distance is between 0 cm and 30 cm.
10. The air turbine starter of claim 1 , further comprising a set of fasteners closing the sealing structure and including the fastener.
11. The air turbine starter of claim 10 wherein the set of fasteners is arranged circumferentially on the sealing structure.
12. The air turbine starter of claim 11 wherein the set of fasteners comprises a set of threaded bolts.
13. The air turbine starter of claim 10 wherein the central disk comprises a reduced cross-sectional thickness, and wherein the set of fasteners is arranged on the sealing structure in axial alignment with the reduced cross-sectional thickness.
14. The air turbine starter of claim 1 wherein the cutting face comprises an outer layer positioned over a base layer, wherein the outer layer comprises a material with a greater hardness than the central disk.
15. The air turbine starter of claim 14 wherein the outer material layer comprises a diamond tip.
16. An air turbine starter for starting an engine, comprising:
a starter housing defining an inlet, an outlet, and a flow path extending between the inlet and the outlet; and
a turbine section located within the starter housing for rotatably extracting mechanical power from a flow of gas along the flow path, the turbine section comprising:
a turbine member comprising a central disk and a set of airfoils spaced circumferentially about the central disk;
a seal housing axially spaced from the turbine member and containing a seal at least partially therein; and
a removable disk cutter having a cutting end confronting the central disk and a fastening end closing the seal housing, wherein the removable disk cutter comprises a threaded bolt threaded into the seal housing, wherein a head of the threaded bolt comprises the cutting end.
17. The air turbine starter of claim 16 wherein the cutting end is configured to release at least a portion of the turbine member during an imbalance condition.
18. The air turbine starter of claim 17 wherein the released portion of the turbine member comprises the set of airfoils and a portion of the central disk.
19. The air turbine starter of claim 16 , further comprising an operative spacing distance defined between the cutting end and the central disk, wherein the operative spacing distance is between 0 cm and 30 cm.