초록 ▼

A seal assembly includes a cloth seal for sealing a cavity between a first mating body and a second mating body, the seal dividing the cavity into a high pressure region and a low pressure region. The cloth seal has a shim assemblage and a cloth assemblage. A first peripheral portion of the cloth se

A seal assembly includes a cloth seal for sealing a cavity between a first mating body and a second mating body, the seal dividing the cavity into a high pressure region and a low pressure region. The cloth seal has a shim assemblage and a cloth assemblage. A first peripheral portion of the cloth seal may include a portion of the cloth assemblage and/or the shim assemblage which contacts the high pressure region and a second peripheral portion including a portion of the cloth assemblage adapted to contact the low pressure region. Knowing the flow conditions and pressure differential through the seal, the density of the cloth seal may be calibrated to control leakage and the shim and cloth assemblages may be designed to minimize contact loads on a mating body.

대표청구항 ▼

A seal assembly includes a cloth seal for sealing a cavity between a first mating body and a second mating body, the seal dividing the cavity into a high pressure region and a low pressure region. The cloth seal has a shim assemblage and a cloth assemblage. A first peripheral portion of the cloth se

A seal assembly includes a cloth seal for sealing a cavity between a first mating body and a second mating body, the seal dividing the cavity into a high pressure region and a low pressure region. The cloth seal has a shim assemblage and a cloth assemblage. A first peripheral portion of the cloth seal may include a portion of the cloth assemblage and/or the shim assemblage which contacts the high pressure region and a second peripheral portion including a portion of the cloth assemblage adapted to contact the low pressure region. Knowing the flow conditions and pressure differential through the seal, the density of the cloth seal may be calibrated to control leakage and the shim and cloth assemblages may be designed to minimize contact loads on a mating body. bellows circumferentially disposed thereon, each of said bellows comprising at least one fluid inlet and configured for urging apart said seal segments upon introduction of a fluid medium in said fluid inlet. 8. The turbine of claim 7, wherein said turbine is selected from the group consisting of steam turbines and gas turbines. 9. The turbine of claim 7, wherein each of said seal segments comprises at least one seal, said seal selected from the group consisting of brush seal bristles, labyrinth teeth seals, abradable seals, honeycomb seals, leaf seals, finger seals, ceramic seals, aramid seals, aspirating seals and combinations thereof. 10. A method of retrofitting a seal assembly in a turbine, said turbine comprising a turbine rotor and a turbine casing, said rotor comprising a generally longitudinally-extending axis, said casing generally coaxially aligned with said axis, said casing circumferentially surrounding and radially spaced apart from said rotor, said casing comprising an inner circumferential channel generally coaxially aligned with said rotor, and said method of retrofitting comprising: disposing a plurality of seal segments in a circumferential array in said channel, said seal segments movable between radially inward and radially outward positions; and circumferentially disposing at least one displacement apparatus on at least one respective end of each of said seal segments, said displacement apparatus comprising at least one fluid inlet and configured for urging apart said seal segments upon introduction of a fluid medium in said fluid inlet. 11. The method of claim 10, wherein each of said displacement apparatuses is selected from the group consisting of a pneumatic actuator, a hydraulic actuator and a combination thereof. 12. The method of claim 10, wherein each of said displacement apparatuses comprises a bellows. 13. The method of claim 10, wherein each of said displacement apparatuses comprises a cylinder actuator.