US3880435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing ring for turbo machines
Assignee: ABB Stal AB
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Filing: 1973-12-19
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Granted: 1975-04-29
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Expires: 1993-12-19
Abstract
Abstract A sealing ring for a turbo machine to limit and define the radial clearance between the outer edge of a turbine disc and its corresponding stator part is disclosed. The sealing ring is divided into discrete sealing block segments, each comprising a smooth metallic inner strip, an intermediate corrugated metallic strip, and a bundle of flat metal plate layers, with provision for cooling air to be introduced and distributed through each segment.
Inventors
- 👤 Per Gosta Thornbald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F16; F16J; F16J15/00; F16J15/44; F16J15/445; Y; Y10; Y10S; Y10S277/00; Y10S277/93
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
221 words
Sealing ring for a turbo machine for limiting and defining the radial clearance between the outer edges of the vanes of a turbine rotor disc and the corresponding stator housing, the sealing ring being composed of a plurality of sealing block segments which are mounted circumferentially on the stator housing, spaced from each other by peripheral gaps, cooled by air flowing through them, and which comprise: a smooth arcuate metallic strip on the inner surface of each sealing block segment facing the turbine rotor disc; a sinusoidally corrugated metallic strip mounted on the radially outward side of said smooth metallic strip so that its inner corrugations are secured to said smooth metallic strip along the lines of contact between said two strips; and a stack of parallel flat metallic sheets mounted on the radially outward side of said corrugated metallic strip, the faces of said metallic sheets being oriented transversely to the corrugations of said corrugated metallic strip and perpendicular to the turbine shaft, said metallic sheets being divided into sectors having a width corresponding to the pitch of the corrugations of said corrugated strip, the inner edge contour of said sheet sectors being so adapted to the shape of said corrugated strip that a channel for cooling air is formed between said corrugated strip and sectors of said sheet stack.
Claim 2
Dependent Claim
221 words
Sealing ring for a turbo machine for limiting and defining the radial clearance between the outer edges of the vanes of a turbine rotor disc and the corresponding stator housing, the sealing ring being composed of a plurality of sealing block segments which are mounted circumferentially on the stator housing, spaced from each other by peripheral gaps, cooled by air flowing through them, and which comprise: a smooth arcuate metallic strip on the inner surface of each sealing block segment facing the turbine rotor disc; a sinusoidally corrugated metallic strip mounted on the radially outward side of said smooth metallic strip so that its inner corrugations are secured to said smooth metallic strip along the lines of contact between said two strips; and a stack of parallel flat metallic sheets mounted on the radially outward side of said corrugated metallic strip, the faces of said metallic sheets being oriented transversely to the corrugations of said corrugated metallic strip and perpendicular to the turbine shaft, said metallic sheets being divided into sectors having a width corresponding to the pitch of the corrugations of said corrugated strip, the inner edge contour of said sheet sectors being so adapted to the shape of said corrugated strip that a channel for cooling air is formed between said corrugated strip and sectors of said sheet stack.
Claim 3
Dependent Claim
62 words
Sealing ring according to claim 1, further comprising: a pair of sheet layers for each sealing block segment each divided into sectors, positioned as a cover layer on either side of said sheet stack and extending radially outwardly from said smooth metallic strip to the outer periphery of the sealing block, thereby sealing the block and said cooling channel on both sides.
Claim 4
Dependent Claim
39 words
Sealing ring according to claim 1, wherein said sheet sectors in each layer of said sheet stack are displaced half the pitch of the corrugations of said corrugated strip with respect to the sectors of the adjacent sheet layer.
Claim 5
Dependent Claim
68 words
Sealing ring according to claim 3, wherein the radially inwardly directed point of each said sector in every second sheet layer of said sheet stack is attached to the bottom of the corresponding corrugation in said corrugated strip, while the alternate sheet layers of said sheet stack are attached at each of their said sectors to the radially outward top of the corresponding corrugation in said corrugated strip.
Claim 6
Dependent Claim
81 words
Sealing ring according to claim 1, wherein in every second sheet layer of said sheet stack the radial height of said sectors is less than the radial height of said sectors in the alternate sheet layers, so that distribution channels for cooling air are formed between the sheet layers in the outward portion of each sealing block segment, all said sectors at the ends of each block segment having full radial height to close said air distribution channels at their ends.
Claim 7
Dependent Claim
59 words
Sealing rings according to claim 1, wherein cooling air is supplied to each sealing block segment through an air introduction channel in the stator, and wherein said sectors of the layers of said sheet stack In an axial zone adjacent to said air introduction channel are formed with reduced radial height, to distribute cooling air over each sealing block.
Claim 8
Dependent Claim
61 words
Sealing ring according to claim 1, wherein cooling air is supplied to each sealing block segment through said air introduction channel in the stator and, in order to provide for passage of cooling air to said channel between said corrugated strip and said sheet stack, a suitable selected number of said sectors of the layers of said sheet stack are omitted.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |