Patent ID: 8640467

Claim:
A power transmission unit for thermo-acoustic systems including at least one stage, said thermo-acoustic systems each including an acoustic resonator including a tube and containing a fluid and wherein an acoustic field is established exhibiting adimensional high impedance zones and adimensional low impedance zones, said at least one stage comprising: a couple of two adjacent tube elements ( 1 , 2 ; 17 , 18 ; 18 , 19 ; 19 , 20 ) forming two adimensional high impedance zones, each tube element including at most one thermo-acoustic unit ( 3 , 4 , 12 - 16 ), each thermo-acoustic unit ( 3 , 4 ) including one of i) a regenerator and two thermal exchangers, and ii) a stack and two thermal exchangers, a section of at least one tube of reduced diameter ( 5 , 21 - 23 ) between the couple of said two adjacent tube elements ( 1 , 2 ; 17 , 18 ; 18 , 19 ; 19 , 20 ), said section of reduced diameter being called a narrow section and forming an adimensional low impedance zone, in the one stage, the narrow section linking two respective adjacent ends of the two adjacent tube elements ( 1 , 2 ; 17 , 18 ; 18 , 19 ; 19 , 20 ) of the couple, in the thermo-acoustic system, two successive thermo-acoustic units being always separated by a narrow section, wherein, each of the two respective adjacent ends of the two tube elements of the couple includes one of i) one derivation ( 6 , 7 ; 24 , 25 ; 26 , 27 ; 28 , 29 ) and ii) one set of derivations in parallel ( 49 - 52 ), each derivation comprises a conduit ( 10 , 11 ) and a cavity ( 8 , 9 ), the cavity being attached at the end of the conduit, each said derivation ( 6 , 7 ) is enabling to divert at least a portion of the volume flow rate of the tube element, and each derivation is mounted on the end of the corresponding adimensional high impedance zone contiguous to the corresponding narrow section.