Composite tubular woven seal for steam turbine diaphragm horizontal joint interfaces
A turbine and steam technology, which is applied in the sealing of engines, gas turbine devices, machines/engines, etc. It can solve problems such as steam leakage at the interface of the diaphragm, reduced machine performance, and misalignment of axial steam surfaces.
Inactive Publication Date: 2007-08-01
GENERAL ELECTRIC CO
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Problems solved by technology
The tight fit at the tabs may also promote misalignment of the upper versus lower axial steam surfaces, also creating circumferential leak paths at the steam interfaces
Since the stacked tabs are linear parts, sealing non-linear leak paths requires a series of discrete tabs with gaps between the tabs, creating some additional leak paths
Generally speaking, misalignment between tabs and slots due to many different causes, including various manufacturing variations, results in significant steam leakage at the bulkhead interface, reducing machine performance
Method used
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[0017] Referring now to the drawings, and in particular to FIG. 1, there is shown a steam turbine, generally designated 10, having an outer casing 12 surrounding an inner casing 14 comprising upper and lower partitions 16 and 18 (FIGS. 1 and 3), with only the lower The separator is shown schematically in Figure 1. It will be appreciated that the casing is likewise formed by the upper and lower casings joined to each other at the horizontal centerline of the turbine, eg by some bolts. Upper and lower baffles surround the steam turbine rotor 20 with steam turbine wheels, one of which is shown at 22 for mounting buckets 24 generally indicated by respective arrows 26 Among the steam flow paths, this flow path includes the flow through the stator vanes 28, as shown. It will be appreciated that the upper and lower bulkheads 16 and 18 extend approximately 180° and have flanges 19 and 21 respectively which are in register with each other along a horizontal midline junction at which s...
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Upper and lower diaphragms of a steam turbine have mating flanges forming a horizontal midline joint interface. Each flange has a groove which registers with a corresponding groove in the opposite flange. A composite woven tubular seal is provided in the mating grooves. The seal comprises an inner woven metal core surrounded by an annular silica fiber layer, in turn surrounded by a metal foil with an outer protective covering of a braided stainless steel. Upon joining the diaphragms to one another, the compliant seal generally conforms to a maximum to the shape of the grooves, maintaining a seal between the diaphragms along the horizontal midline joint.
Description
technical field [0001] This invention relates to steam turbines having seals at the horizontal centerline junction between upper and lower bulkheads, and more particularly to a composite tubular braided seal between the upper and lower bulkheads to seal within each bulkhead The path and contain the steam within the steam path. Background technique [0002] Steam turbines generally have upper and lower bulkheads with flanges at the horizontal centerline junction with seals at that location for sealing between the bulkheads. Overlapping tabs are typically used at each horizontal centerline joint interface to achieve a seal therebetween. These types of metal seals typically include registering slots in the centerline flanges of the upper and lower bulkheads and one or more tabs extending within the slots to seal between the bulkheads. The stacked key pieces are some rigid, slender parts made of metal, and they rely on the tight fit in the slots of the upper and lower partitio...
Claims
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IPC IPC(8): F01D11/02F01D5/20F01D11/00F01D25/00F01D25/24F01D25/26F16J15/08F16J15/10F16J15/12
CPCF01D11/005F01D25/26F01D25/243F16J15/0812F02C7/28F01D11/00
Inventor 卡姆利什·芒德拉约翰·考丹尼尔·R·普雷德莫阿布杜尔-阿齐兹·默罕穆德-法基尔吉恩·帕尔莫乔纳森·芒希
Owner GENERAL ELECTRIC CO