Heat sound converter

A heat sound converter for converting heat into sound waves by utilizing a thermoacoustic phenomenon, comprising:

• a heater having a first sound wave passage formed on an inner circumferential side of a first outer circumference portion and through which the sound waves pass, and a high temperature side fluid passage formed on the first outer circumference portion and through which a first fluid flows;
• a cooler having a second sound wave passage formed on an inner circumferential side of a second outer circumference portion through which the sound waves pass, and a low temperature side fluid passage formed on the second outer circumference portion and through which a second fluid having a temperature lower than that of the first fluid flows;
• and
• a heat accumulator disposed between the heater and the cooler, having an intermediate sound wave passage formed between a plurality of cell walls through which the sound waves pass via the first sound wave passage and the second sound wave passage;
• wherein
• at least one of the heater and the cooler is provided with a heat transfer portion that is provided on an inner circumferential side of the first outer circumference portion or the second outer circumference portion and divides the first sound wave passage or the second sound wave passage into a plurality of sections,
• in the heat accumulator, at a position facing the heat transfer portion in a cross section perpendicular to an axial direction along a direction in which the intermediate sound wave passage is formed, a heat transfer wall portion is formed which is thicker than the cell wall and is used to block a portion of the intermediate sound wave passage and conduct heat transfer with the heat transfer portion, and
• a thermal conductive material made of a material softer than the material constituting the heat transfer portion and the material constituting the heat transfer wall portion is sandwiched between the heat transfer portion and the heat transfer wall portion.

A heat sound converter for converting heat into sound waves by utilizing a thermoacoustic phenomenon, comprising:

• a heater having a first sound wave passage formed on an inner circumferential side of a first outer circumference portion and through which the sound waves pass, and a high temperature side fluid passage formed on the first outer circumference portion and through which a first fluid flows;
• a cooler having a second sound wave passage formed on an inner circumferential side of a second outer circumference portion through which the sound waves pass, and a low temperature side fluid passage formed on the second outer circumference portion and through which a second fluid having a temperature lower than that of the first fluid flows;
• and
• a heat accumulator disposed between the heater and the cooler, having an intermediate sound wave passage formed between a plurality of cell walls through which the sound waves pass via the first sound wave passage and the second sound wave passage;
• wherein
• at least one of the heater and the cooler is provided with a heat transfer portion that is provided on an inner circumferential side of the first outer circumference portion or the second outer circumference portion and divides the first sound wave passage or the second sound wave passage into a plurality of sections,
• in the heat accumulator, at a position facing the heat transfer portion in a cross section perpendicular to an axial direction along a direction in which the intermediate sound wave passage is formed, a heat transfer wall portion is formed which is thicker than the cell wall and is used to block a portion of the intermediate sound wave passage and conduct heat transfer with the heat transfer portion, and
• a branch fluid passage is formed inside the heat transfer portion, branching from the high temperature side fluid passage or the low temperature side fluid passage and through which the first fluid or the second fluid flows.