The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 2019
Filed:
Jan. 26, 2015
Ngk Insulators, Ltd., Nagoya-Shi, JP;
Yukio Miyairi, Nagoya, JP;
Shinichi Miwa, Tagimi, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
The thermoacoustic energy converting element part includes a plurality of through holes extending along a uniform direction to penetrate a body of the thermoacoustic energy converting element part to form traveling paths of acoustic waves. The element part includes a wall surrounding each of the through holes to extend in an extending direction of the through hole and configured to exchange heat between the fluid. The through hole includes a through hole that has a hydraulic diameter of 0.4 mm or smaller, and an open area ratio of the through holes is 60% or higher. A first layer and a second layer are alternately provided on the wall of the thermoacoustic energy converting element part along the extending direction. A porosity of the first layer is 0% or smaller than a porosity of the second layer. The thermal conductivity of the structure of the thermoacoustic energy converting element part along the extending direction is 2 W/m/K or lower. If a metal plate is provided as the first layer, a plurality of the metal plates having a roughened main surface is layered and bonded by thermocompression bonding to manufacture the thermoacoustic energy converting element part.