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US 9,435,203 B2Granted
Rotary positive displacement machine
AssigneePeter South
InventorPeter South
Life of this patent
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Abstract
Rotary displacement machines are known for their uses as compressors, expansion engines and the like. Many comprise two or more rotors mounted for simultaneous rotation within a casing, with intermeshing or interengagement of lobes and pits as surface features of the rotors, thereby to handle a working fluid. Disclosed herein are rotary displacement machines with improved structures and rotor configurations.
Claims8
A gas turbine engine comprising a rotary positive displacement machine with interengaging rotors, adapted to handle a working fluid by rotation of the rotors through rotary cycles, the machine comprising:
- a casing structure comprising two or more intersecting bores, at least two of which bores have different radial dimensions relative to one another, the casing further including at least one high pressure port for the flow therethrough of working fluid at high pressure, and at least one low pressure port for the flow therethrough of the working fluid at lower pressure;
- rotors, each mounted for rotation in one of said intersecting bores with axes for rotation substantially parallel with one another, each rotor comprising at least one radially extending lobe having peripheral, radially-extended surfaces which define close-clearance or sealing interfaces with inner surfaces of each bore within which each rotor is mounted for rotation;
- such that each lobe on each rotor mounted in one size of said bores has lobes that have a smaller radial extent measured from the hub of its respective rotor to a farthest extremity of the lobe, compared to a larger radial extent of each lobe on each rotor mounted in the other size of said bores, thus to provide said close-clearance or sealing interfaces, each rotor also comprising at least one pit into which to receive a lobe of an adjacent rotor during an interengaging portion of each rotary cycle;
- and
- timing gear means constraining said rotors to rotate in timed, interengaging relation in said intersecting bores, with adjacent rotors rotating in opposite directions such that the lobes and pits of adjacent rotors interengage as the rotors rotate,
- wherein the high pressure port comprises an injector for injecting a combustable fuel or fuel/air mixture, into the engine wherein ignition of the injected fuel causes rapid heating with an increase in volume and/or pressure of the fluid within the casing to force the lobes of adjacent rotors apart, thereby to turn adjacent rotors in opposite directions.
3 more elements
A gas turbine engine comprising a rotary positive displacement machine with interengaging rotors, adapted to handle a working fluid by rotation of the rotors through rotary cycles, the machine comprising:
- a casing structure comprising two or more intersecting bores, at least two of which bores have different radial dimensions relative to one another, the casing further including at least one high pressure port for the flow therethrough of working fluid at high pressure, and at least one low pressure port for the flow therethrough of the working fluid at lower pressure;
- rotors, each mounted for rotation in one of said intersecting bores with axes for rotation substantially parallel with one another, each rotor comprising at least one radially extending lobe having peripheral, radially-extended surfaces which define close-clearance or sealing interfaces with inner surfaces of each bore within which each rotor is mounted for rotation;
- such that each lobe on each rotor mounted in one size of said bores has lobes that have a smaller radial extent measured from the hub of its respective rotor to a farthest extremity of the lobe, compared to a larger radial extent of each lobe on each rotor mounted in the other size of said bores, thus to provide said close-clearance or sealing interfaces, each rotor also comprising at least one pit into which to receive a lobe of an adjacent rotor during an interengaging portion of each rotary cycle;
- and
- timing gear means constraining said rotors to rotate in timed, interengaging relation in said intersecting bores, with adjacent rotors rotating in opposite directions such that the lobes and pits of adjacent rotors interengage as the rotors rotate,
- wherein the gas turbine engine is connected to a compressor comprising another rotary positive displacement machine, and wherein the compressed working fluid from the compressor is heated and then fed or injected into the engine for ignition.
3 more elements
Dependencies are inferred from the claim text.