Aisin Seiki Kabushiki Kaisha

The Boc Group, Inc.

Edwards Limited

Rolls-royce Corporation

Aisin Seiki K.k.

Peter Hugh Birch

Nigel Paul Schofield

Toshiyuki Kondo

Mark G Norton

Katsuhiro Mori

Stephen Dowdeswell

Neil Turner

Graham A Reynolds

Malcolm William Gray

David Alan Turrell

Alan B Turner

Takeshi Ikeyama

Michael John Atkinson

Anthony David Wearing

Michael Morris

Shinji Kono

Michael J Raine

Shigenori Haramura

A multistage vacuum pump includes a stator housing a multistage rotor assembly, each stage having intermeshing Roots rotor components, wherein the tip radius of the rotor components at an inlet stage of the pump is larger than the tip radius of the rotor components at an exhaust stage of the pump, wherein a meshing clearance between the rotor components at the inlet stage of the pump is greater than a meshing clearance between the rotor components at the exhaust stage of the pump.

Multistage roots vacuum pump having different tip radius and meshing clearance from inlet stage to exhaust stage

A vacuum pump housing comprises first () and second half-shell stator components () defining a plurality of pumping chambers separated by partition members (). Each pumping chamber comprises an inlet port () for receiving fluid and an outlet port () through which pumped fluid is exhausted from the chamber. The inlet ports are open on an external surface of the first stator component, and the outlet ports are open on an opposing external surface of the second stator component. The stator components further define transfer channels () for conveying fluid between the pumping chambers. Each transfer channel preferably comprises first and second portions located on opposite sides of the housing.

Vacuum pump

A seal assembly for the protection of a static seal device for use in a vacuum pump. The seal assembly comprising at least two components which are sealingly connected together, an o-ring seal, which is engaged between the two components to prevent transfer of fluid to and from the pump between these two components and a fluid channel. The fluid channel being in the plane of the o-ring and located between the o-ring seal and a process gas flow path. The fluid channel provides a path for a barrier gas to be routed when the apparatus is in use. The channel being connectable to an external source of barrier fluid and having an outlet in fluid communication with the pump swept volume.

Seal assemblies

A vacuum pump comprising a pump chamber having an inlet and an outlet and through which gas from an enclosure connectable to the inlet can be pumped to a pump exhaust. At least one rotor, adapted for high velocity rotation, is provided within the chamber and mounted on a shaft extending from the chamber and to a pump gearbox substantially isolated from the chamber by means of a shaft seal associated with the shaft. The shaft seal is of a close tolerance but non-contact design. During use of the pump, gas pressure in the vicinity of the shaft seals and arising from the changeable gas pressures associated with operation of the pump rotor is buffered.

Vacuum pumps

A gas turbine engine comprises turbine and compressor elements on a rotary shaft. The shaft is rotably mounted on preloaded axial thrust bearings. As it rotates in use the turbine and compressor elements create an axial thrust load on the bearings. According to the invention that axial thrust load is opposed by an electromagnetic coil which is energised to exert an axial force on the shaft in opposition to the axial thrust load and preferably completely balancing the axial thrust load. Bearing life is much extended.

Gas turbine engine

A gas turbine engine driven auxiliary electric power unit which includes a turbine (9), an air compressor (7) for supplying compressed air to the turbine and driven by the turbine, fuel supplying means (2) for supplying gaseous fuel to the turbine, a generator (10) driven by the turbine for generating electrical output power which is fed to a main electric user supply (14), first detecting means (15) for monitoring turbine shaft speed, second detecting means (19) for monitoring the output power of the generator, first modulating means (16,18,13) for modulating the turbine shaft speed to cause it to coincide with a predetermined shaft speed (17) by means of controlling current flow from the generator to the main electric user supply, and second modulating means (20,22,23) for modulating the flow of gaseous fuel which is supplied from the fuel supplying means to the turbine so as to cause the monitored output power to coincide with a predetermined output power (21).

Gas turbine engine driven auxiliary electric power unit with turbine

A gaseous fuel compression and control system for gas turbine engine (30) comprises a screw compressor (10) driven by an electric motor (11) for feeding gaseous fuel to the gas turbine engine, and a modulating device (12) for modulating the rotational speed of the motor by controlling the frequency of electric power to the motor in response to sensed output power of the gas turbine engine.

Gaseous fuel compression and control system for gas turbine engine

An epicyclic gear comprises housing, pinion forming on an input shaft supported in the housing, at least three planetary gears supported in the housing via shafts and geared with the pinion, an internal gear supported in the housing via an output shaft and surrounding and geared with the planetary gears, a passage for lubricating oil through the housing into the shafts of the planetary gears, a conduit supported on at least one shaft and for conveying oil from the shafts towards the center of the housing via outlet jets, and a bridge supported between at least two shafts and supporting the outlet jets, wherein at least one planetary gear overlaps the remaining adjacent planetary gears in an axial direction of the pinion without mutual interfering with each other.

High reduction gear assembly with lubrication

A high speed rotating electromagnetic motor/generator includes a rotor having a core of magnetic material, a layer of permanent magnet, a retainer ring and side walls of non-magnetic material. A stator is provided by magnetic steel laminations and winding slots. A case includes a cylindrical inner casing, a cylindrical outer casing and end caps which carry the machine bearings. The permanent magnets within the rotating part may be made of neodymium-boron-iron and produce a high flux density pole rotor. The motor/generator can be operated as a brushless direct current or synchronous alternating current machine. Efficient means of cooling is provided by helical channels, which carry a liquid coolant, and are formed in the casing.

Dynamoelectric machines

An apparatus for the domestic cogeneration of heat and electrical energy utilizing an inverted Brayton cycle gas turbine, a combustion chamber, an electrical generator and a compressor. Combustion air is preheated in a heat exchanger by gaseous combustion gases or exhaust gases exiting from the turbine. The combustion air is supplied at substantially atmospheric pressure to the combustion chamber where fuel is burned. The cooled gaseous combustion gases exiting from the heat exchanger are then fed to the compressor where they are recompressed to atmospheric pressure, and are finally used to heat the working fluid of a domestic heating system before being exhausted to the atmosphere. The apparatus can also include an acoustically and thermally insulated housing, an electric air blower for start-up, an engine ignition device, a frequency converter which conditions the electric generator output for connection to the main supply and a control system which is cooled by the engine intake air and which detects thermal and electrical demand and adjusts the engine power accordingly.

Gas turbine cogeneration apparatus for the production of domestic heat

A compact, air cycle air conditioning system including compressor, turbine, heat exchanger and high speed electric motor is thermostatically controlled to supply either hot or cold conditioned air to a load air space. In a second arrangement, compact, exhaust gas driven air cycle air conditioning system including a compressor, turbine, two heat exchangers and an exhaust turbine is controlled by means of an exhaust gas bypass arrangement and supplies either hot or cold conditioned air to a load air space. In a third arrangement compact, exhasut gas driven air cycle air conditioning system includes an expansion turbine, two compressors, two heat exchangers and an exhaust turbine which is preferably controlled by means of an exhaust gas bypass arrangement and supplies either hot or cold conditioning air to a load air space.

Growing community of inventors

Horsham, United Kingdom

Peter Hugh Birch