摘要:
In a gas turbine having a chordal hinge seal (46) between an inner rail (52) of each nozzle segment and an annular axially facing sealing surface (54) of a nozzle support ring (44), a flexible supplemental seal (70) is disposed between the support ring and inner band (52) of the nozzle segment radially inwardly of the chordal hinge seal. To minimize or prevent leakage flow across the chordal hinge seal, the flexible seal extends between the inner rail and the sealing surface of the support ring radially inwardly of the chordal hinge seal. A first margin (74) of the flexible seal engages in a linear groove carried by the inner rail. The opposite margin (78) extends arcuately in sealing engagement with the nozzle support ring.
摘要:
In a gas turbine having a chordal hinge seal between an inner rail (52) of each nozzle segment and an annular axially facing sealing surface (54) of a nozzle support ring (44), a supplemental seal (70) is disposed between the support ring and inner bands of the nozzle segments on a lower pressure side of the chordal hinge seals. To minimize or prevent leakage flow across the chordal hinge seals, a generally U-shaped supplemental seal (70) having reversely folded U-shaped marginal portions (74) is received in a cavity formed in the axially extending sealing surface of the inner rail (52) of the nozzle segment. At operating conditions, the marginal portions (74) seal against the base of the cavity and the annular sealing surface (54) of the nozzle support ring to prevent leakage flow past the chordal hinge seal from entering the hot gas path. To install the supplemental seal, the seal is first compressed and maintained in a compressed state by applying one or more wraps about the supplemental seal or an epoxy to secure the seal when compressed in the cavity. At operating temperatures, the retention means releases the seal to engage marginal portions against opposite sealing surfaces of the nozzle segment and support ring.
摘要:
In a gas turbine having a chordal hinge seal (46) between an inner rail (52) of each nozzle segment and an annular axially facing sealing surface (54) of a nozzle support ring (44), a flexible supplemental seal (70) is disposed between the support ring and inner band (52) of the nozzle segment radially inwardly of the chordal hinge seal. To minimize or prevent leakage flow across the chordal hinge seal, the flexible seal extends between the inner rail and the sealing surface of the support ring radially inwardly of the chordal hinge seal. A first margin (74) of the flexible seal engages in a linear groove carried by the inner rail. The opposite margin (78) extends arcuately in sealing engagement with the nozzle support ring.
摘要:
A gas turbine engine oil supply and scavenge apparatus includes: a stationary first frame comprising a first hub and a first outer ring interconnected by an array of radially-extending hollow first struts; a forward wet cavity defined radially inboard of the first frame, having a first rolling element bearing disposed therein; a supply line extending from the first outer ring through one of the first struts and communicating with the forward wet cavity, the supply line adapted to discharge oil to the forward wet cavity; a stationary second frame comprising a second hub and a second outer ring interconnected by an array of radially-extending hollow second struts, the second frame disposed aft of the first frame; and a scavenge path communicating with the forward wet cavity and adapted to remove oil-air mist from the forward wet cavity, the scavenge path defined at least in part by the second frame.
摘要:
A device (14) and method for uniformly providing lubricant to rotating machine parts is provided. The device (14) comprises an axially mounted rotating circumferential lubricant reservoir (20) with a weir (22) comprising one side of the lubricant reservoir (20). The reservoir (20) and weir (22) are disposed at uniform radius and circumferentially about an axis of rotation causing lubricant added to the reservoir (20) to flow uniformly over the weir 22 about the circumference of the weir (22) when the device (14) is in high speed rotational motion. Because of the uniform flow of lubricant over the top of the weir (28) around the circumference of the weir (22), lubricant can be directed to machine parts requiring lubrication in a uniform manner around the circumference of the moving device (14).
摘要:
In a gas turbine having a chordal hinge seal between an inner rail (52) of each nozzle segment and an annular axially facing sealing surface of a nozzle support ring, a supplemental seal is disposed between the support ring and inner band (52) of the nozzle segment on a lower pressure side of the chordal hinge seal. The supplemental seal includes a flexible sheet metal seal having a margin (78) secured in a groove (74) of the inner rail (52) of the nozzle segments with a bent-over edge (80) to form a seal therewith. The opposite margin of the seal has an edge which bears against the axially opposed sealing surface of the nozzle support ring. Leakage flow past the chordal hinge seal exerts sealing pressure against the preloaded flexible seal to maintain the seal between the sealing surfaces of the support ring and segments. The supplemental seal extends circumferentially and spans the joint between adjacent nozzle segments.
摘要:
A compliant woven tubular seal (70) is provided in an arcuate cavity opening through an axial face of a plurality of shroud segments in opposition to a nozzle retaining ring. The annular composite tubular woven compliant seal includes a stainless steel inner metal core (78) surrounded by an annular layer of silica fiber (80). Surrounding the silica fiber is a metal foil (82) which prevents flow past the supplemental seal. an outer wear-resistant braiding (84) serves as a protective covering and wear surface.
摘要:
A gas turbine engine oil supply and scavenge apparatus includes: a stationary first frame comprising a first hub and a first outer ring interconnected by an array of radially-extending hollow first struts; a forward wet cavity defined radially inboard of the first frame, having a first rolling element bearing disposed therein; a supply line extending from the first outer ring through one of the first struts and communicating with the forward wet cavity, the supply line adapted to discharge oil to the forward wet cavity; a stationary second frame comprising a second hub and a second outer ring interconnected by an array of radially-extending hollow second struts, the second frame disposed aft of the first frame; and a scavenge path communicating with the forward wet cavity and adapted to remove oil-air mist from the forward wet cavity, the scavenge path defined at least in part by the second frame.
摘要:
A rotating seal (54) for a gas turbine engine includes: (a) an annular seal body; (b) a sealing component (60, 62) carried by the seal body which is adapted to form one-half of a rotating seal interface; and (c) an impeller (64) carried by the seal body which comprises a plurality of radially-inwardly-extending impeller blades (74).