Patent ID: 8806875

Claim:
A thermoacoustic device comprising: a loop tube having a loop; a first stack provided between a first high-temperature side heat exchanger and a first low-temperature side heat exchanger; and a second stack provided between a second high-temperature side heat exchanger and a second low-temperature side heat exchanger, in which self-excited standing and traveling waves are generated by heating the first high-temperature side heat exchanger, and the second low-temperature side heat exchanger is cooled by the standing and traveling waves, or in which standing and traveling waves are generated by cooling the first low-temperature side heat exchanger, and the second high-temperature side heat exchanger is heated by the standing and traveling waves, wherein a piezoelectric film is provided in the loop tube to close the loop tube such that the piezoelectric film shuts off a direct-current flow of a working fluid in the loop of the loop tube and that the piezoelectric film is vibrated to suppress heat transportation from the first stack to the second stack, wherein a phase of an acoustic wave generated from the piezoelectric film is set to be the same as a phase of the standing and traveling waves to suppress generation of a harmonic wave.