Heat/acoustic wave conversion component and heat/acoustic wave conversion unit

Patent metadata

Field	Value
Publication number	US-9759201-B2
Application number	US-201514853015-A
Country	US
Kind code	B2
Filing date	Sep 14, 2015
Priority date	Sep 19, 2014
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A heat/acoustic wave conversion component includes a partition wall that defines a plurality of cells, inside of the cells being filled with fluid that oscillates to transmit acoustic waves, the heat/acoustic wave conversion component mutually converting heat exchanged between the partition wall and the fluid and energy of acoustic waves resulting from oscillations of the fluid. The plurality of cells have an average of hydraulic diameters HDs that is 0.4 mm or less in a plane perpendicular to the cell extending direction, the heat/acoustic wave conversion component has an open frontal area at each end face of 60% or more and 93% or less, and distribution of hydraulic diameters HDs of the plurality of cells has relative standard deviation that is 2% or more and 30% or less.

First claim

What is claimed is:

1. A heat/acoustic wave conversion component having a first end face and a second end face, comprising a partition wall that defines a plurality of cells extending from the first end face to the second end face, inside of the cells being filled with fluid that oscillates to transmit acoustic waves, the heat/acoustic wave conversion component mutually converting heat exchanged between the partition wall and the fluid and energy of acoustic waves resulting from oscillations of the fluid, wherein
the plurality of cells have an average of hydraulic diameters HDs that is 0.4 mm or less, where each hydraulic diameter HD is defined as HD=4×S/C, where S denotes an area of a cross-section of each cell in a plane perpendicular to the cell extending direction and C denotes a perimeter of the cross section,
the heat/acoustic wave conversion component has an open frontal area at each end face of 60% or more and 93% or less, and
the plurality of cells have hydraulic diameters HDs thereof which are different in accordance with each cell, and distribution of hydraulic diameters HDs of the plurality of cells has relative standard deviation that is 2% or more and 30% or less.

2. The heat/acoustic wave conversion component according to claim 1 , wherein pairs of mutually neighboring cells of the plurality of cells have thickness of the partition wall between neighboring cells of each pair which is different in accordance with each neighboring cells, and distribution of thickness of the partition wall between the neighboring cells has relative standard deviation that is 3% or more and 22% or less.

3. The heat/acoustic wave conversion component according to claim 2 , further comprising a circumferential wall that surrounds a circumferential face of the partition wall as a whole that defines the plurality of cells, wherein
when the cross section of the heat/acoustic wave conversion component in the plane is divided into a plurality of unit segments each of which is a rectangular region of 1 mm in length and 1 mm in width, inside unit segments, which are remaining unit segments obtained by removing unit segments including the cross section of the circumferential wall from the plurality of unit segments, have open frontal areas of the cells therein which are different in accordance with each inside unit segment, and distribution of open frontal areas of the cells in the inside unit segments has relative standard deviation of 7% or more and 40% or less.

4. A heat/acoustic wave conversion unit, comprising the heat/acoustic wave conversion component according to claim 3 , in a state where inside of the plurality of cells is filled with the fluid, when there is a temperature difference between a first end part on the first end face side and a second end part on the second end face side, the heat/acoustic wave conversion component oscillating the fluid along the extending direction in accordance with the temperature difference and generating acoustic waves; and
a pair of heat exchangers that are disposed in a vicinity of the first end part and the second end part of the heat/acoustic wave conversion component, respectively, the heat exchangers exchanging heat with the both end parts to give a temperature difference between the both end parts.

5. A heat/acoustic wave conversion unit comprising:
the heat/acoustic wave conversion component according to claim 3 , in a state where inside of the plurality of cells is filled with the fluid, and when the fluid oscillates along the extending direction while receiving acoustic waves transmitted, the heat/acoustic wave conversion component generating a temperature difference between a first end part on the first end face side and a second end part on the second end face side in accordance with oscillations of the fluid;
a heat exchanger that is disposed in a vicinity of one of the first end part and the second end part of the heat/acoustic wave conversion component, the heat exchanger supplying heat to the one end part or absorbing heat from the one end part to keep a temperature at the one end part constant; and
a hot heat/cold heat output unit that is disposed in a vicinity of the other end part of the first end part and the second end part of the heat/acoustic wave conversion component that is on the opposite side of the one end part, the hot heat/cold heat output unit outputting hot heat or cold heat obtained from exchanging of heat with the other end part so that, in a state where the temperature of the one end part is kept constant by the heat exchanger and when the heat/acoustic wave conversion component receives acoustic waves transmitted, the other end part has a temperature difference in accordance with oscillations of the fluid due to transmission of the acoustic waves with reference to the one end part kept at the constant temperature.

6. A heat/acoustic wave conversion unit, comprising the heat/acoustic wave conversion component according to claim 2 , in a state where inside of the plurality of cells is filled with the fluid, when there is a temperature difference between a first end part on the first end face side and a second end part on the second end face side, the heat/acoustic wave conversion component oscillating the fluid along the extending direction in accordance with the temperature difference and generating acoustic waves; and
a pair of heat exchangers that are disposed in a vicinity of the first end part and the second end part of the heat/acoustic wave conversion component, respectively, the heat exchangers exchanging heat with the both end parts to give a temperature difference between the both end parts.

7. A heat/acoustic wave conversion unit comprising:
the heat/acoustic wave conversion component according to claim 2 , in a state where inside of the plurality of cells is filled with the fluid, and when the fluid oscillates along the extending direction while receiving acoustic waves transmitted, the heat/acoustic wave conversion component generating a temperature difference between a first end part on the first end face side and a second end part on the second end face side in accordance with oscillations of the fluid;
a heat exchanger that is disposed in a vicinity of one of the first end part and the second end part of the heat/acoustic wave conversion component, the heat exchanger supplying heat to the one end part or absorbing heat from the one end part to keep a temperature at the one end part constant; and
a hot heat/cold heat output unit that is disposed in a vicinity of the other end part of the first end part and the second end part of the heat/acoustic wave conversion component that is on the opposite side of the one end part, the hot heat/cold heat output unit outputting hot heat or cold heat obtained from exchanging of heat with the other end part so that, in a state where the temperature of the one end part is kept constant by the heat exchanger and when the heat/acoustic wave conversion component receives acoustic waves transmitted, the other end part has a temperature difference in accordance with oscillations of the fluid due to transmission of the acoustic waves with reference to the one end part kept at the constant temperature.

8. The heat/acoustic wave conversion component according to claim 1 , further comprising a circumferential wall that surrounds a circumferential face of the partition wall as a whole that defines the plurality of cells, wherein
when the cross section of the heat/acoustic wave conversion component in the plane is divided into a plurality of unit segments each of which is a rectangular region of 1 mm in length and 1 mm in width, inside unit segments, which are remaining unit segments obtained by removing unit segments including the cross section of the circum

Assignees

• Ngk Insulators Ltd

Inventors

• Miyairi Yukio
• Miwa Shinichi
• Noda Naomi
• Deguchi Yuji
• Mori Teruyoshi
• Hamatsuka Kazuhiko
• Suenobu Hiroyuki
• Hironaga Masayuki
• Kumazawa Kazuhiko

Classifications

• F03G7/00 Primary

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• F25B2309/1402

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• H02K35/06

  with moving flux distributors, and both coil systems and magnets stationary · CPC title

• F02G2243/54

  thermo-acoustic · CPC title

• F02G1/0435

  the engine being of the free piston type · CPC title