GB791568A - Improvements in axial flow compressors - Google Patents
Improvements in axial flow compressorsInfo
- Publication number
- GB791568A GB791568A GB931856A GB931856A GB791568A GB 791568 A GB791568 A GB 791568A GB 931856 A GB931856 A GB 931856A GB 931856 A GB931856 A GB 931856A GB 791568 A GB791568 A GB 791568A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- coating
- powdered
- finely
- formaldehyde
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
- F01D11/122—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part with erodable or abradable material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paints Or Removers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
In an axial-flow compressor, the portions of the housing adjacent the paths of the rotor blade tips are coated with an abradable skin that can be machined by the blade tips in motion. The coating may be applied to the housing by brushing, spraying, or by the use of a roller or spreader. Alternatively, it may be in sheet or tape form bonded to the housing. The coating is heated at a temperature rising from 100 DEG F. to 500 DEG F. in hourly steps of 100 degrees to harden it, and is then machined to a thickness of, say, 0.01 to 0.03 inches. The tips of the rotor blades can, if necessary, machine the coating to establish a minimum working clearance. The coating may comprise a mixture of a filler such as powdered graphite or finely-divided asbestos, or both, with a heat hardenable silicone resin, a thermosetting resin, e.g. phenol-formaldehyde, urea-formaldehyde, melamine-formaldehyde and certain fluoro-carbon resins, or a heat hardenable material such as sodium silicate, with the addition of a volatile solvent or diluent. Other fillers which may be used are glass fibre, silica flour or other ceramic material, powdered spent catalyst or powdered metals such as aluminium, antimony, tin and lead. The solvent or diluent may include secondary butyl acetate, mineral spirits, xylene, toluene or other liquid hydrocarbons. Plasticizers, such as various phthalates and glycol esters, may be included to improve the flexibility of the coating at low temperatures.ALSO:A coating composition comprises a heathardenable silicone resin or a thermosetting resin such as phenol formaldehyde, urea formaldehyde, melamine formaldehyde, or a fluorocarbon resin, with a filler such as powdered graphite, finely-divided asbestos, glass fibre, silica flour or other ceramic material, powdered spent catalyst, tin and lead, and a solvent or diluent such as secondary butyl acetate, mineral spirits, xylene, toluene or other liquid hydrocarbons. Plasticizers, such as various phthalates and glycol esters, may be included to improve the flexibility of the coating at low temperatures. After application, the coating is cured by heating it at a temperature rising from 100 to 500 DEG F. in hourly steps of 100 degrees. In general, the composition can be made by adding up to 2 gm. of powdered graphite or asbestos or both per c.c. of a mixture comprising 15-45 per cent of one or more silicone resins, up to 75 per cent of volatile solvent or diluent or both, and, optionally, 7-12 per cent of finely-divided metallic powder. A preferred composition comprises 7-45 per cent of heat-hardenable silicone resin, 15-55 per cent of powdered graphite or finely-divided asbestos or both, up to 10 per cent of finely-divided aluminium or other metal, and up to 65 per cent of volatile matter. The composition can be made by adding about 1 gm. of powdered graphite or finely-divided asbestos per c.c. of a silicone resin paint. Alternatively, 0.25 gm. of powdered graphite is added per c.c. of a liquid mixture comprising 7 per cent of powdered aluminium, 40 per cent of a heat-hardenable silicone resin, and 53 per cent of toluene.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US339012A US2962809A (en) | 1953-02-26 | 1953-02-26 | Method of making a compressor seal |
GB931856A GB791568A (en) | 1956-03-26 | 1956-03-26 | Improvements in axial flow compressors |
CH344168D CH344168A (en) | 1956-03-26 | 1956-04-06 | Method for applying a coating, which serves to reduce the rotor blade tip clearance, on the inside of the housing of axial compressors, and coating produced according to this method |
FR1150778D FR1150778A (en) | 1956-03-26 | 1956-04-11 | Axial compressor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB931856A GB791568A (en) | 1956-03-26 | 1956-03-26 | Improvements in axial flow compressors |
Publications (1)
Publication Number | Publication Date |
---|---|
GB791568A true GB791568A (en) | 1958-03-05 |
Family
ID=9869665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB931856A Expired GB791568A (en) | 1953-02-26 | 1956-03-26 | Improvements in axial flow compressors |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH344168A (en) |
FR (1) | FR1150778A (en) |
GB (1) | GB791568A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3039737A (en) * | 1959-04-13 | 1962-06-19 | Int Harvester Co | Device for controlling clearance between rotor and shroud of a turbine |
US3053694A (en) * | 1961-02-20 | 1962-09-11 | Gen Electric | Abradable material |
US3083529A (en) * | 1959-03-24 | 1963-04-02 | Charles W F Hemilton | Hydraulic jet propulsion apparatus for water-borne craft |
US3092306A (en) * | 1958-04-28 | 1963-06-04 | Gen Motors Corp | Abradable protective coating for compressor casings |
US3173605A (en) * | 1963-06-21 | 1965-03-16 | Rotron Mfg Co | Fan housing |
EP0722989A1 (en) * | 1995-01-17 | 1996-07-24 | Dow Corning Corporation | Organosiloxane compositions yielding machinable erosion resistant elastomers |
US20110002779A1 (en) * | 2008-12-24 | 2011-01-06 | Laurent Schuster | Method for Manufacturing by Molding a Machine Structural Element Having an Abradable Surface, and Structural Element |
EP1975271A3 (en) * | 2007-03-24 | 2011-05-18 | Rolls-Royce plc | A method of repairing a damaged abradable coating |
WO2013075954A1 (en) * | 2011-11-25 | 2013-05-30 | Rolls-Royce Plc | Abradable liner for a gas turbine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2112878B (en) * | 1981-12-28 | 1985-12-04 | United Technologies Corp | Air seal for compressor stator |
DE3316535A1 (en) * | 1983-05-06 | 1984-11-08 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | TURBO COMPRESSOR WITH INLET COVER |
-
1956
- 1956-03-26 GB GB931856A patent/GB791568A/en not_active Expired
- 1956-04-06 CH CH344168D patent/CH344168A/en unknown
- 1956-04-11 FR FR1150778D patent/FR1150778A/en not_active Expired
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3092306A (en) * | 1958-04-28 | 1963-06-04 | Gen Motors Corp | Abradable protective coating for compressor casings |
US3083529A (en) * | 1959-03-24 | 1963-04-02 | Charles W F Hemilton | Hydraulic jet propulsion apparatus for water-borne craft |
US3039737A (en) * | 1959-04-13 | 1962-06-19 | Int Harvester Co | Device for controlling clearance between rotor and shroud of a turbine |
US3053694A (en) * | 1961-02-20 | 1962-09-11 | Gen Electric | Abradable material |
US3173605A (en) * | 1963-06-21 | 1965-03-16 | Rotron Mfg Co | Fan housing |
EP0722989A1 (en) * | 1995-01-17 | 1996-07-24 | Dow Corning Corporation | Organosiloxane compositions yielding machinable erosion resistant elastomers |
EP1975271A3 (en) * | 2007-03-24 | 2011-05-18 | Rolls-Royce plc | A method of repairing a damaged abradable coating |
US8563080B2 (en) | 2007-03-24 | 2013-10-22 | Rolls-Royce Plc | Method of repairing a damaged abradable coating |
US20110002779A1 (en) * | 2008-12-24 | 2011-01-06 | Laurent Schuster | Method for Manufacturing by Molding a Machine Structural Element Having an Abradable Surface, and Structural Element |
US8491258B2 (en) * | 2008-12-24 | 2013-07-23 | Techspace Aero S.A. | Method for manufacturing by molding a machine structural element having an abradable surface, and structural element |
WO2013075954A1 (en) * | 2011-11-25 | 2013-05-30 | Rolls-Royce Plc | Abradable liner for a gas turbine |
Also Published As
Publication number | Publication date |
---|---|
FR1150778A (en) | 1958-01-17 |
CH344168A (en) | 1960-01-31 |
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