US4536127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbocompressor provided with an abradable coating
Assignee: MOTOREN- und TURBINEN- UNION MUNCHEN DOCHAUER STRASSE 665 POSTFACH 50 06 40 8000 MUNCHEN 50 WEST GERMANY GmbH
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Filing: 1984-05-01
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Granted: 1985-08-20
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Expires: 2004-05-01
Abstract
Abstract An improvement for a turbocompressor having a rotor, a stator and a casing, and an abradable coating provided between the rotor blades and the casing, or between the stator vanes and the rotor, such that the blades make initial contact with the coating to abrade the coating and produce a minimal clearance. The abradable coating is formed on a member having a first layer of carbon-fiber reinforced graphite adapted for attaching the coating member to the casing or rotor, and a second layer of graphite in the region in which the blade tips are intended to rub. The second layer may optionally contain, preferably radially oriented brush-type graphite-fiber reinforcements, or be entirely composed thereof.
Inventors
- 👤 Axel Rossmann
- 👤 Herbert Merz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:06
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/122; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
123 words
In a turbocompressor having a rotatable element comprising a rotor including rotor blades, a stationary element comprising a stator including stator vanes and a casing, and a member with an abradable coating interposed between the rotatable and stationary elements, said abradable coating facing the rotor blades such that the rotor blades come into initial contact with the coating to produce a minimal clearance therewith, the improvement wherein said member with the abradable coating comprises a first layer of carbon-reinforced graphite and a second layer comprised solely of graphite, said first layer being supported by one of said elements with said second layer facing the other of said elements to be abraded upon relative rotation of said elements to establish the minimal clearance therebetween.
Claim 2
Dependent Claim
123 words
In a turbocompressor having a rotatable element comprising a rotor including rotor blades, a stationary element comprising a stator including stator vanes and a casing, and a member with an abradable coating interposed between the rotatable and stationary elements, said abradable coating facing the rotor blades such that the rotor blades come into initial contact with the coating to produce a minimal clearance therewith, the improvement wherein said member with the abradable coating comprises a first layer of carbon-reinforced graphite and a second layer comprised solely of graphite, said first layer being supported by one of said elements with said second layer facing the other of said elements to be abraded upon relative rotation of said elements to establish the minimal clearance therebetween.
Claim 3
Dependent Claim
19 words
The improvement as claimed in claim 1 wherein said first and second layers are integrally joined to one another.
Claim 4
Dependent Claim
29 words
The improvement as claimed in claim 1 wherein said first and second layers are homogeneously formed of said graphite with the carbon reinforcement disposed solely in said first layer.
Claim 5
Dependent Claim
18 words
The improvement as claimed in claim 1 wherein said member with the abradable coating is of ring shape.
Claim 6
Dependent Claim
17 words
The improvement as claimed in claim 1 wherein said member comprises a plurality of part annular segments.
Claim 7
Dependent Claim
21 words
The improvement as claimed in claim 1 wherein said second layer includes a brush-type graphite fiber reinforcement with radially oriented fibers.
Claim 8
Dependent Claim
18 words
The improvement as claimed in claim 1 wherein said second layer has a thickness of approximately 1 mm.
Claim 9
Dependent Claim
38 words
The improvement as claimed in claim 1 wherein said one element includes a support fixed to said one element and further comprising means securing said member to said one element with said second layer facing said other element.
Claim 10
Dependent Claim
15 words
The improvement as claimed in claim 8 wherein said support comprises an annular metal member.
Claim 11
Dependent Claim
22 words
The improvement as claimed in claim 9 wherein said means which secures said member to said one element comprises a bonded connection.
Claim 12
Dependent Claim
14 words
The improvement as claimed in claim 10 wherein said bonded connection includes adhesive means.
Claim 13
Dependent Claim
22 words
The improvement as claimed in claim 9 wherein said means which secures said member to said one element comprises an interlocking connection.
Claim 14
Dependent Claim
17 words
The improvement as claimed in claim 12 wherein said interlocking connection is separable to release said member.
Claim 15
Dependent Claim
61 words
The improvement as claimed in claim 13 wherein said interlocking connection includes a dovetail engagement between said member and said one element which prevents removal of said member from said one element, said one element including a pair of separate elements cooperatively defining a dovetail shaped recess for said member, and releasable attachment means joining said pair of separate elements together.
Claim 16
Dependent Claim
33 words
The improvement as claimed in claim 1 wherein said member is secured to said stationary element with said second layer facing the rotor blades and said first layer remote from the rotor blades.
Claim 17
Dependent Claim
20 words
The improvement as claimed in claim 1 wherein said second layer consists of brush-type graphite fibers oriented in radial direction.
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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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |