US4460185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal including a non-metallic abradable material
Assignee: General Electric Co
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Filing: 1982-08-23
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Granted: 1984-07-17
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Expires: 2002-08-23
Abstract
Abstract An abradable seal member, which can be a component of a rotary seal in juxtaposition with another member, includes a non-metallic abradable material comprising a halogenated hydrocarbon, for example Teflon material. Such a material, which preferably is porous, has a solids content of at least about 40 weight %, a heat of combustion of no more than about 4000 BTU per pound, the halogenated hydrocarbon being at least about 60 weight % halogen.
Inventors
- 👤 Max F. Grandey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:14
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/122; F16; F16J; F16J15/00; F16J15/44; F16J15/445; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10S277/945; Y10S277/946
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
117 words
A gas turbine engine rotary seal comprising: a first member and a second member disposed in juxtaposition and adapted for relative movement with respect one to the other; a porous non-metallic abradable material secured at a surface of the first member and consisting essentially of: (a) a halogenated hydrocarbon with at least about 60 weight % halogen; (b) a solids content of about 50-90 weight %; and (c) a heat of combustion of no more than about 4,000 BTU per pound; the second member including at least one projection directed toward the abradable material on the first member and cooperating with a surface of the abradable material to provide a fluid pressure drop seal between the members.
Claim 2
Dependent Claim
117 words
A gas turbine engine rotary seal comprising: a first member and a second member disposed in juxtaposition and adapted for relative movement with respect one to the other; a porous non-metallic abradable material secured at a surface of the first member and consisting essentially of: (a) a halogenated hydrocarbon with at least about 60 weight % halogen; (b) a solids content of about 50-90 weight %; and (c) a heat of combustion of no more than about 4,000 BTU per pound; the second member including at least one projection directed toward the abradable material on the first member and cooperating with a surface of the abradable material to provide a fluid pressure drop seal between the members.
Claim 3
Dependent Claim
12 words
The rotary seal of claim 1 in which the halogen is fluorine.
Claim 4
Dependent Claim
20 words
The rotary seal of claim 2 in which the fluorine is included in the range of about 70-80 weight %.
Claim 5
Dependent Claim
16 words
The rotary seal of claim 2 in which the halogen is in the form of tetrafluoroethylene.
Claim 6
Dependent Claim
63 words
The rotary seal of claim 1 in which the abradable material is a composite structure comprising: an inner portion and a surface portion, each portion being a form of the non-metallic abradable material; the inner portion being the porous abradable material secured with the first member; and the surface portion being a substantially void-free form of the material secured with the inner portion.
Claim 7
Dependent Claim
62 words
A gas turbine engine abradable seal member comprising: a base member; and a porous non-metallic abradable member secured with the base member and consisting essentially of: (a) a halogenated hydrocarbon with at least about 60 weight % halogen; (b) a solids content of about 50-90 weight %; and (c) a heat of combustion of no more than about 4,000 BTU per pound.
Claim 8
Dependent Claim
62 words
A gas turbine engine abradable seal member comprising: a base member; and a porous non-metallic abradable member secured with the base member and consisting essentially of: (a) a halogenated hydrocarbon with at least about 60 weight % halogen; (b) a solids content of about 50-90 weight %; and (c) a heat of combustion of no more than about 4,000 BTU per pound.
Claim 9
Dependent Claim
11 words
The member of claim 6 in which the halogen is fluorine.
Claim 10
Dependent Claim
19 words
The member of claim 7 in which the fluorine is included in the range of about 70-80 weight %.
Claim 11
Dependent Claim
15 words
The member of claim 7 in which the halogen is in the form of tetrafluoroethylene.
Claim 12
Dependent Claim
61 words
The member of claim 6 in which the member is a composite structure comprising: an inner portion and a surface portion, each portion being a form of the non-metallic abradable material; the inner portion being the porous abradable material secured with the first member; and the surface portion being a substantially void-free form of the material secured with the inner portion.
Claim 13
Dependent Claim
58 words
The rotary seal of claim 1 in which: the first member is a gas turbine engine stationary shroud; and the second member comprises a plurality of gas turbine engine rotating blading members each including a tip portion as the projection directed toward and in juxtaposition with the non-metallic abradable material secured at a surface of the first member.
Claim 14
Dependent Claim
35 words
The rotary seal of claim 11 in which the non-metallic abradable material secured at a surface of the first member has secured thereto a surface portion of a substantially void-free form of said abradable material.
Claim 15
Dependent Claim
39 words
The rotary seal of claim 1 in the form of a labyrinth type seal in which the second member includes a plurality of teeth in juxtaposition and in cooperation with a non-metallic abradable material secured with the first member.
Claim 16
Dependent Claim
35 words
The rotary seal of claim 13 in which the non-metallic abradable material secured at a surface of the first member has secured thereto a surface portion of a substantially void-free form of said abradable material.
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |