Patents by Inventor Anthony G. Razzell

Anthony G. Razzell has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7637096
    Abstract: A pressure rise combustor is provided with fuel provided at intermittent periods. The fuel is pulsed at timings such that the phase lag between the addition of the fuel and a resultant pressure rise is minimized. The fuel is pulsed such that the unsteady addition of heat reinforces the amplitude of an unsteady pressure fluctuation.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: December 29, 2009
    Assignee: Rolls-Royce plc
    Inventors: Anthony G Razzell, Mark D Taylor, Samuel A Mason, Robert J Miller
  • Publication number: 20090297330
    Abstract: Control of blade clearance gaps between rotating turbine blades and an associated casing in a gas turbine engine is important in order to maintain operational efficiency. It is desirable to achieve accurate gap control but previous passive and scheduled thermal gap adjustment systems have been relatively course. By provision of a winding through which a specific electrical current is passed in order to create electro-magnetic force for displacement of an armature associated with a seal forming part of the casing it is possible to adjust the gap between that seal and a tip part of a rotating blade assembly. Normally a blade gap monitoring technique is used in association with specific operational requirements with respect to the gap by the control in order to determine the electrical current presented to the winding.
    Type: Application
    Filed: August 7, 2007
    Publication date: December 3, 2009
    Inventors: Anthony G. Razzell, John R. Webster, Geraint W. Jewell
  • Publication number: 20090286189
    Abstract: A pressure rise combustor is provided with fuel provided at intermittent periods. The fuel is pulsed at timings such that the phase lag between the addition of the fuel and a resultant pressure rise is minimised. The fuel is pulsed such that the unsteady addition of heat reinforces the amplitude of an unsteady pressure fluctuation.
    Type: Application
    Filed: July 10, 2009
    Publication date: November 19, 2009
    Inventors: Anthony G. Razzell, Mark D. Taylor, Samuel A. Mason, Robert J. Miller
  • Publication number: 20090044933
    Abstract: A heat exchanger is provided in which heat exchanger shells are formed by electro forming about a mandrel. The shells are attached and joined to provide a heat exchanger module. As the shells are not press formed problems with respect to material elongation to achieve deep grooves in the shells are potentially avoided and shells can be created with more desirable thickness to achieve more efficient heat exchange. Furthermore, reduced shell thickness will also reduce weight and therefore improve the acceptability of heat exchangers in particular applications such as those associated with aerospace and automotive sports.
    Type: Application
    Filed: July 21, 2008
    Publication date: February 19, 2009
    Applicant: ROLLS-ROYCE PLC
    Inventors: Andrew M. Rolt, Anthony G. Razzell
  • Patent number: 7448849
    Abstract: A turbofan gas turbine engine (10) comprises a compressor rotor (24) carrying a plurality of circumferentially spaced radially extending rotor blades (26) and a casing (28) surrounding the compressor rotor (24) and compressor rotor blades (26). A compressor rotor blade tip seal (48) comprises an annular member (30) secured to and arranged within the casing (28). The annular member (40) has a plurality of circumferentially spaced axially extending corrugations (32) and a plurality of radially spaced circumferentially extending corrugations (34). A lining (40) is secured to and arranged within the annular member (30). The lining (40) is spaced radially from the tips (27) of the compressor rotor blades (26) to form a clearance (29). An actuator (56) is provided to move the annular member (30) and lining (40) radially to control the size of the clearance (29).
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: November 11, 2008
    Assignee: Rolls-Royce plc
    Inventors: John R Webster, Anthony G Razzell, Philip D Brown
  • Publication number: 20080267770
    Abstract: A turbofan gas turbine engine (10) comprises a compressor rotor (24) carrying a plurality of circumferentially spaced radially extending rotor blades (26) and a casing (28) surrounding the compressor rotor (24) and compressor rotor blades (26). A compressor rotor blade tip seal (48) comprises an annular member (30) secured to and arranged within the casing (28). The annular member (40) has a plurality of circumferentially spaced axially extending corrugations (32) and a plurality of radially spaced circumferentially extending corrugations (34). A lining (40) is secured to and arranged within the annular member (30). The lining (40) is spaced radially from the tips (27) of the compressor rotor blades (26) to form a clearance (29). An actuator (56) is provided to move the annular member (30) and lining (40) radially to control the size of the clearance (29).
    Type: Application
    Filed: March 23, 2004
    Publication date: October 30, 2008
    Inventors: John R. Webster, Anthony G. Razzell, Philip D. Brown
  • Publication number: 20080247863
    Abstract: Sensors (32, 52, 72) for determining a gap between a conductive member (34, 54, 74) such as a blade in a gas turbine engine and a seal segment (31, 51) are known to use capacitive variants in order to create an electrical signal indicative of the gap width. Thermal disparities can create problems with regard to sensor ageing and accuracy. By creating a sensor incorporating a metal rod (33, 53, 74) typically integrally formed or associated with the seal segment (31, 51) and coupled through inductive coupling loops (35, 36; 55, 56; 75) it is possible to create a tuned circuit with a Q value which is more stable and therefore acceptable with regard to producing more accurate results at elevated temperatures with less problems with regard to thermal disparities.
    Type: Application
    Filed: October 2, 2007
    Publication date: October 9, 2008
    Applicant: ROLLS-ROYCE PLC
    Inventors: Anthony G. Razzell, Lee Mansfield, Leo V. Lewis
  • Publication number: 20080206046
    Abstract: A ceramic seal segment for a shroud ring of a rotor of a gas turbine engine, the ceramic seal segment positioned radially adjacent the rotor and characterized by being a hollow section that defines an inlet and an outlet for the passage of coolant therethrough.
    Type: Application
    Filed: February 4, 2008
    Publication date: August 28, 2008
    Applicant: ROLLS-ROYCE PLC
    Inventors: Anthony G. Razzell, Steven M. Hillier
  • Patent number: 7288870
    Abstract: A stator core 2 comprises laminations (9) of low loss stator iron forming a body of magnetic nature and lamination components (11) of high thermal conductivity material regularly arranged within that body. The high thermal conductivity components (11) increasing the effective radial thermal conductivity rate of the core 2 whereby temperature gradients are reduced in comparison with previous stator cores. Thus, there is a reduction in operational temperature of the electrical insulation on the stator windings.
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: October 30, 2007
    Assignee: Rolls-Royce plc
    Inventors: Alan J Mitcham, Anthony G Razzell
  • Patent number: 6888439
    Abstract: An electrical conductor winding (70) comprises a plurality of laminates of electrical insulation (72). Each laminate of electrical insulation (72) has a slot (78) on one surface (76). Each laminate of electrical insulation (70) has an electrical conductor (82) arranged in the slot (78). An electrical connector (84) connects the electrical conductor (82) in one laminate of electrical insulation (78) with the electrical conductor (82) in an adjacent laminate of electrical insulation (72). The laminates of electrical insulation (72) are arranged such that the surface (74) of one laminate of electrical insulation (72) abuts and is bonded to the surface (76) of an adjacent laminate of electrical insulation (12). The laminates of electrical insulation (12) comprise a glass-ceramic material. The electrical conductor windings allow active magnetic bearings, electric motors and electric generators to be used at temperatures up to 500° C. for example in gas turbine engines.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: May 3, 2005
    Assignee: Rolls-Royce plc
    Inventors: Anthony G. Razzell, John J A Cullen, Diane Holland
  • Publication number: 20040245883
    Abstract: A stator core 2 comprises laminations (9) of low loss stator iron forming a body of magnetic nature and lamination components (11) of high thermal conductivity material regularly arranged within that body. The high thermal conductivity components (11) increasing the effective radial thermal conductivity rate of the core 2 whereby temperature gradients are reduced in comparison with previous stator cores. Thus, there is a reduction in operational temperature of the electrical insulation on the stator windings.
    Type: Application
    Filed: May 21, 2004
    Publication date: December 9, 2004
    Inventors: Alan J. Mitcham, Anthony G. Razzell
  • Patent number: 6794781
    Abstract: An electrical machine comprises a combined magnetic gearbox and electrical generator. A first set of permanent magnets (30) are arranged on a rotor (16) to produce a spatially variable first magnetic field. A second set of permanent magnets (32) are arranged on a rotor (40,41,43), stationary pole pieces (36) are positioned between the first set of permanent magnets (30) and the second set of permanent magnets (32) to interfere with the first magnetic field. Rotation of the rotor (16) relative to the pole pieces (36) produces a second magnetic field which rotates the second set of permanent magnets (32). A stator (42) has windings (46) to transduce a changing second magnetic field produced by the rotation of the second set of permanent magnets (32) into an electrical voltage. The electrical machine is useful for a wind turbine generator. Alternatively the arrangement may be modified to produce an electrical motor.
    Type: Grant
    Filed: April 4, 2003
    Date of Patent: September 21, 2004
    Assignee: Rolls-Royce plc
    Inventors: Anthony G. Razzell, John J A Cullen
  • Patent number: 6765328
    Abstract: An inner rotatable shaft 16 is located within an outer rotatable shaft 18. A stator 52 is provided around the shaft 18. The shaft 18 has a circumferential ring of regions 54a, 54b alternately of relatively high and relatively low magnetic permeability. Flux is therefore transmitted between the stator 52 and the shaft 16 through the regions 54, preferentially through the high permeability regions 54a. Commutation of the stator windings, preferably in synchrony with the speed of rotation of the shaft 18, allows the stator 52 and shaft 16 to interact in the form of an active magnetic bearing. The affect of the presence of the shaft 18 on this interaction is significantly reduced or eliminated.
    Type: Grant
    Filed: October 24, 2002
    Date of Patent: July 20, 2004
    Assignee: Rolls-Royce plc
    Inventors: Anthony G Razzell, Ian C D Care, John J A Cullen
  • Publication number: 20040108781
    Abstract: An electrical machine comprises a combined magnetic gearbox and electrical generator. A first set of permanent magnets (30) are arranged on a rotor (16) to produce a spatially variable first magnetic field. A second set of permanent magnets (32) are arranged on a rotor (40, 41, 43), stationary pole pieces (36) are positioned between the first set of permanent magnets (30) and the second set of permanent magnets (32) to interfere with the first magnetic field. Rotation of the rotor (16) relative to the pole pieces (36) produces a second magnetic field which rotates the second set of permanent magnets (32). A stator (42) has windings (46) to transduce a changing second magnetic field produced by the rotation of the second set of permanent magnets (32) into an electrical voltage. The electrical machine is useful for a wind turbine generator. Alternatively the arrangement may be modified to produce an electrical motor.
    Type: Application
    Filed: April 4, 2003
    Publication date: June 10, 2004
    Inventors: Anthony G. Razzell, John J. A. Cullen
  • Publication number: 20040085177
    Abstract: An electrical conductor winding (70) comprises a plurality of laminates of electrical insulation (72). Each laminate of electrical insulation (72) has a slot (78) on one surface (76). Each laminate of electrical insulation (70) has an electrical conductor (82) arranged in the slot (78). An electrical connector (84) connects the electrical conductor (82) in one laminate of electrical insulation (78) with the electrical conductor (82) in an adjacent laminate of electrical insulation (72). The laminates of electrical insulation (72) are arranged such that the surface (74) of one laminate of electrical insulation (72) abuts and is bonded to the surface (76) of an adjacent laminate of electrical insulation (12). The laminates of electrical insulation (12) comprise a glass-ceramic material. The electrical conductor windings allow active magnetic bearings, electric motors and electric generators to be used at temperatures up to 500° C. for example in gas turbine engines.
    Type: Application
    Filed: October 23, 2003
    Publication date: May 6, 2004
    Applicant: Rolls-Royce plc
    Inventors: Anthony G. Razzell, John J.A. Cullen, Diane Holland
  • Patent number: 6718774
    Abstract: A fastener (31) is disclosed for a first article, for example a tile (29), to a second article for example an outer wall (27) of a wall structure (21, 22) of a combustor (15) of a gas turbine engine (10). The fastener (31) comprises an elongate main part, which may be in the form of a bolt (34). The main part can extend through the first and second articles. The main part defines a cooling pathway (46) therethrough to allow the passage of a cooling gas through the main part.
    Type: Grant
    Filed: September 19, 2002
    Date of Patent: April 13, 2004
    Assignee: Rolls-Royce plc
    Inventor: Anthony G Razzell
  • Patent number: 6680667
    Abstract: An electrical conductor winding (70) comprises a plurality of laminates of electrical insulation (72). Each laminate of electrical insulation (72) has a slot (78) on one surface (76). Each laminate of electrical insulation (70) has an electrical conductor (82) arranged in the slot (78). An electrical connector (84) connects the electrical conductor (82) in one laminate of electrical insulation (78) with the electrical conductor (82) in an adjacent laminate of electrical insulation (72). The laminates of electrical insulation (72) are arranged such that the surface (74) of one laminate of electrical insulation (72) abuts and is bonded to the surface (76) of an adjacent laminate of electrical insulation (12). The laminates of electrical insulation (12) comprise a glass-ceramic material. The electrical conductor windings allow active magnetic bearings, electric motors and electric generators to be used at temperatures up to 500° C. for example in gas turbine engines.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: January 20, 2004
    Assignee: Rolls-Royce plc
    Inventors: Anthony G Razzell, John J A Cullen, Diane Holland
  • Patent number: 6660115
    Abstract: A method of manufacturing a ceramic matrix composite comprises forming a slurry comprising a ceramic sol, filler particles and a solvent and forming laminates of fibers (12). The laminates of fibers (12) are impregnated with the slurry and are stacked (14) on a mold (10). The stack (14) of laminates of fibers (12) is covered by a porous membrane (16), a breather fabric (18) and a vacuum bag (20). The vacuum bag (20) is evacuated and is heated to a temperature of 60° C. for 10 hours to produce a ceramic matrix composite. The ceramic matrix composite is then heated to a temperature of 1200° C. at atmospheric pressure to sinter the ceramic matrix composite.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: December 9, 2003
    Assignee: Rolls-Royce plc
    Inventors: Edwin G Butler, Anthony G Razzell, John Dominy, Paul A Doleman, Ihsan A H Al-Dawery
  • Publication number: 20030127927
    Abstract: An inner rotatable shaft 16 is located within an outer rotatable shaft 18. A stator 52 is provided around the shaft 18. The shaft 18 has a circumferential ring of regions 54a,54b alternately of relatively high and relatively low magnetic permeability. Flux is therefore transmitted between the stator 52 and the shaft 16 through the regions 54, preferentially through the high permeability regions 54a. Commutation of the stator windings, preferably in synchrony with the speed of rotation of the shaft 18, allows the stator 52 and shaft 16 to interact in the form of an active magnetic bearing. The affect of the presence of the shaft 18 on this interaction is significantly reduced or eliminated.
    Type: Application
    Filed: October 24, 2002
    Publication date: July 10, 2003
    Inventors: Anthony G. Razzell, Ian C. D. Care, John J. A. Cullen
  • Publication number: 20030123953
    Abstract: A fastener (31) is disclosed for a first article, for example a tile (29), to a second article for example an outer wall (27) of a wall structure (21, 22) of a combustor (15) of a gas turbine engine (10). The fastener (31) comprises an elongate main part, which may be in the form of a bolt (34). The main part can extend through the first and second articles. The main part defines a cooling pathway (46) therethrough to allow the passage of a cooling gas through the main part.
    Type: Application
    Filed: September 19, 2002
    Publication date: July 3, 2003
    Inventor: Anthony G. Razzell