Exhaust casing hub comprising stress-distributing ribs
View Patent ↗An exhaust casing hub includes a hub center, and an upstream flange and a downstream flange arranged on either side of the hub center. Each flange is terminated by a rim. A plurality of cuffs are arranged on the hub center so as to form an angle from the tangent toward the radial direction of 10° to 80° , preferably 15° to 75°. At least one rib is formed at the base of each cuff below a critical stress region in the cuff. The rib is joined to the downstream flange by a downstream end and to the upstream flange by an upstream end.
1. An equipped hub of an exhaust casing comprising:
a hub center;
an upstream flange disposed on an upstream side of the hub center;
a downstream flange disposed on a downstream side of the hub center; and
a plurality of cuffs extending radially from the hub center and arranged circumferentially around the hub center,
wherein at least one rib is provided at an exterior of a base of each cuff so as to surround the cuff below a maximum stress location in the cuff, said rib being joined to the downstream flange at a downstream end of the rib and to the upstream flange at an upstream end of the rib.
2. The equipped hub as claimed in claim 1 , further comprising an upstream rib joined to the upstream flange and a downstream rib joined to the downstream flange.
3. The equipped hub as claimed in claim 1 , wherein a first end of the cuff directly connects with the upstream flange and the downstream flange, and a second end of the cuff directly connects with a circular part so as to form a circular shroud.
4. The equipped hub as claimed in claim 1 , wherein each cuff arranged on the hub center is disposed at an angle of 10° to 80° between a tangent of the hub center and a radial direction of the hub center.
5. The equipped hub as claimed in claim 4 , wherein the angle of each cuff is 15° to 75°.
6. An exhaust casing comprising:
an equipped hub comprising a plurality of cuffs and a shroud surrounding the hub;
arms disposed at an angle of 10° to 80° between a tangent of the hub and a radial direction of the hub, said arms being welded between the shroud and each cuff,
wherein the hub is in accordance with claim 1 .
7. A turbine which comprises an exhaust casing as claimed in claim 6 .
8. A turbomachine which comprises an exhaust casing as claimed in claim 6 .
9. The exhaust casing as claimed in claim 6 , wherein the angle of the arms is 15° to 75°.
10. The equipped hub as claimed in claim 1 , wherein the equipped hub is disposed downstream of a low pressure turbine.
11. The exhaust casing as claimed in claim 1 , wherein the at least one rib provided at the exterior of the base of each cuff entirely surrounds the cuff.
12. An equipped hub of an exhaust casing comprising:
a hub center;
an upstream flange disposed on an upstream side of the hub center;
a downstream flange disposed on a downstream side of the hub center; and
a plurality of cuffs arranged circumferentially around the hub center,
wherein at least one rib is provided at an exterior of a base of each cuff below a maximum stress location in the cuff, said rib being joined to the downstream flange at a downstream end of the rib and to the upstream flange at an upstream end of the rib, and
wherein the rib is joined to the flange via a fillet, and the fillet directly contacts an inner face of the upstream flange.
13. An equipped hub of an exhaust casing comprising:
a hub center;
an upstream flange disposed on an upstream side of the hub center;
a downstream flange disposed on a downstream side of the hub center; and
a plurality of cuffs arranged circumferentially around the hub center,
wherein at least one rib is provided at an exterior of a base of each cuff below a maximum stress location in the cuff, said rib being joined to the downstream flange at a downstream end of the rib and to the upstream flange at an upstream end of the rib, and
wherein the rib is joined to the flange via a fillet, and the fillet directly contacts an inner face of the downstream flange.