초록 ▼

A plurality of arcuate, circumferentially extending leaf seal segments form an annular seal spanning between annular sealing surfaces of inner and outer casings of a turbine. The ends of the adjoining seal segments have circumferential gaps to enable circumferential expansion and contraction of the

A plurality of arcuate, circumferentially extending leaf seal segments form an annular seal spanning between annular sealing surfaces of inner and outer casings of a turbine. The ends of the adjoining seal segments have circumferential gaps to enable circumferential expansion and contraction of the segments. The end of a first segment includes a tab projecting into a recess of a second end of a second segment. Edges of the tab seal against the sealing surfaces of the inner and outer casings have a narrow clearance with opposed edges of the recess. An overlying cover plate spans the joint. Leakage flow is maintained at a minimum because of the reduced gap between the radially spaced edges of the tab and recess, while the seal segments retain the capacity to expand and contract circumferentially.

대표청구항 ▼

1. In a turbine having radially spaced inner and outer casings and generally annular sealing surfaces, a seal for sealing across the sealing surfaces and between high and low pressure regions on opposite sides of the seal, said seal comprising:first and second seal segments disposed in a generally c

1. In a turbine having radially spaced inner and outer casings and generally annular sealing surfaces, a seal for sealing across the sealing surfaces and between high and low pressure regions on opposite sides of the seal, said seal comprising:first and second seal segments disposed in a generally common plane in end-to-end relation to one another, a first end of said first segment having a projection and a second end of said second segment in opposition to said first end having a recess for receiving the projection, said first and second ends having edges defining circumferentially extending gaps therebetween; said projection having radially spaced edges for sealingly engaging the respective sealing surfaces of the inner and outer casings; and radially spaced edges of said recess in opposition to respective edges of said projection defining radial gaps therebetween each having a smaller gap width than the width of each of the circumferential gaps between said first and second ends.