Patent ID: 7610762

Claim:
Thermal engine comprising: two independent rotors ( 3 , 4 , 4 ′), each respectively mounted in one of two casings ( 5 , 6 , 6 ′), the first rotor ( 3 ) belonging to a low pressure stage ( 1 ), the second rotor ( 4 , 4 ′) belonging to a high pressure stage ( 2 , 2 ′), each stage ( 1 , 2 , 2 ′) provided with its rotor ( 3 , 4 , 4 ′) and associated fixed fluid preparation members ( 9 , 10 , 13 , 14 , 89 , 91 , 92 , 93 ) combining gas compression means, known as compressors ( 15 , 16 , 90 ), and gas expansion means, known as expanders ( 17 , 18 , 90 ); and at least one combustion chamber ( 19 , 20 ) situated within a substantially cylindrical central volume defined at its bases by the two rotors ( 3 , 4 , 4 ′) and their casings ( 5 , 6 , 6 ′), and at its lateral surface by a first substantially cylindrical wall ( 22 ), in an inner radial positions; said first wall being substantially coaxial with a second substantially cylindrical wall ( 23 ) in an intermediate radial position, these defining between them a first duct ( 26 ) connecting the outlet of the compressor ( 16 , 90 ) of the high pressure stage to the inlet of a first combustion chamber ( 19 ); and said second wall ( 23 ) being substantially coaxial with a third substantially cylindrical wall ( 24 ) in an outer radial position, these defining between them a second duct ( 25 ), outside the first duct ( 26 ) and connecting the outlet of the compressor ( 15 ) of the low pressure stage ( 1 ) to the inlet of the compressor ( 16 , 90 ) of the high pressure stage ( 2 , 2 ′); the outlet of the first combustion chamber ( 19 ) supplying the expander ( 18 , 90 ) of the high pressure stage ( 2 , 2 ′) with gases produced by combustion, guided from the outlet of the expander ( 18 , 90 ) of the high pressure stage ( 2 , 2 ′) to the inlet of the expander ( 17 ) of the low pressure stage ( 1 ), the outlet of which is in communication with the outside of a casing ( 24 , 27 , 31 ) of the engine via at least one exhaust opening ( 41 ) for the gases produced by combustion.