Power plants – Combustion products used as motive fluid
Reexamination Certificate
1999-03-19
2001-04-17
Thorpe, Timothy S. (Department: 3746)
Power plants
Combustion products used as motive fluid
Reexamination Certificate
active
06216438
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to a pipeline duct through an opening of a vane support housing and an opening in an outer wall of an axial compressor of a gas turbine.
BACKGROUND OF THE INVENTION
To bleed compressed air from the vane support interior space, a pipeline is firmly clamped in a discharge opening of the outer wall of the compressor housing in a gas turbine developed by the applicant.
The pipeline duct is led through two or more walls, which are displaced horizontally and vertically in relation to one another because of relative movements. The pipeline is sealed by soft sealing rings at the discharge opening of the vane support housing. The drawback of this design is that the ducts become loose when the elasticity is lost due to increased temperature of the sealing rings and thus leaks will develop.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the present invention is to provide a temperature-resistant sealing which has low wear, on the one hand, and guarantees an unlimited freedom of movement of the pipe duct in the radial and axial directions, on the other hand.
Compressed air is bled from the vane support housing of an axial compressor of a gas turbine via a pipeline by means of the device according to the present invention. Since the vane support is located within the axial compressor housing, the pipeline must be led through the annular space of the axial compressor, which is formed by the walls of the vane support housing and of the compressor housing.
The different pressure levels in the vane support interior space, in the annular space and outside the axial compressor housing require sealing of the spaces against each other and against the pipeline. Since the housing walls and the pipeline are subject to different thermal expansions, the sealing must permit a relative movement of the components in the horizontal and vertical directions.
The upper part of the pipeline is therefore firmly clamped according to the present invention at the duct and the bleeder connection of the compressor housing wall with a flange and is sealed by two seals.
The pipe is sealed by a piston ring at the duct and the discharge opening of the vane support. The piston ring permits the relative movement of the pipe and the compressor housing in relation to the vane support in the vertical direction.
The piston ring is guided at the vane support wall by two fastening rings. Due to their free spaces, the fastening rings permit the relative movement of the pipe and the compressor housing in relation to the vane support in the horizontal direction.
The device according to the present invention can be applied in all cases in which a pipeline passes through a plurality of walls which are subject to relative movements in a sealed manner.
In addition, the device is temperature-resistant due to being made of metal, and no wearing parts are needed. Unlimited freedom of movement in the radial and axial directions is possible due to the predetermined free spaces. The mounting of the device is very simple. The risk of excitation due to forces generated by flow is ruled out.
The present invention will be explained in greater detail based on a schematic exemplary embodiment.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
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patent: 3967829 (1976-07-01), Rogers
patent: 4844689 (1989-07-01), Seed
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patent: 5160241 (1992-11-01), Glynn
patent: 5351478 (1994-10-01), Walker et al.
patent: 665 450 A5 (1988-05-01), None
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patent: 39 05 900 A1 (1990-08-01), None
patent: 41 36 408 A1 (1993-05-01), None
patent: 195 45 699 A1 (1997-06-01), None
Aschenbruck Emil
Blaswich Michael
Man Turbomaschinen AG GHH Borsig
McGlew and Tuttle , P.C.
Rodriguez William
Thorpe Timothy S.
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