Acoustic power transmitting unit for thermoacoustic systems

F - Mech Eng,Light,Heat,Weapons – 02 – G

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F02G 1/043 (2006.01)

Patent

CA 2565573

The invention relates to an acoustic power transmitting unit for thermoacoustic systems comprising at least on stage ptovided with at least two thermoacoustic units (3, 4, 12-16) each of which comprises a regenerator or a stack and two heat exchangers, an acoustic resonator comprising a tube and containing a fluid and in which a magnetic field consisting of high impedance and low-impedance areas is arranged, wherein certain thermoacoustic units (3, 4, 12-16) are placed in high dimensionless impedance areas. According to said invention, each high dimensionless impedance area also comprises a thermoacoustic unit, wherein two successive thermoacoustic units (3, 4, 12-16) are always separated by low dimensionless impedance. The resonator comprises a reduced diameter section (5, 21-23) between each couple of successive thermoacoustic units (3, 4, 12-16) and each cross-sectional narrowing (5, 21-23) is associated with at least one by-pass (6,7) which comprises a deviation cavity (10, 11) and makes it possible to deviate the major part of a volume flow rate.

La présente invention concerne une unité de transmission de puissance acoustique pour systèmes thermoacoustiques comportant au moins un étage, comprenant :- au moins deux unités thermoacoustiques (3, 4, 12-16) comportant chacune un régénérateur ou un stack et deux échangeurs thermiques, - un résonateur acoustique comportant un tube et contenant un fluide et dans lequel s'établit un champ acoustique présentant des zones de forte impédance et des zones de faible impédance,- certaines unités thermoacoustiques (3, 4, 12-16) étant placées dans des zones de forte impédance adimensionnelle. Selon l'invention, chaque zone de forte impédance adimensionnelle comporte au plus une unité thermoacoustique, deux unités thermoacoustiques (3, 4,12-16) successives étant toujours séparées par une zone de faible impédance adimensionnelle. Le résonateur comporte une section de diamètre réduit (5, 21- 23) entre chacun des couples d'unités thermoacoustiques (3, 4, 12-16) successives et chaque rétrécissement de section (5, 21-23) est associé à au moins une dérivation (6, 7) comprenant une cavité (10, 11 ) dérivée, ladite dérivation (6, 7) permettant de détourner la plus grande partie du débit volumique.

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