Acoustic device

US10352210B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Thomas P. Hanschen · Windom, US
• Jonathan H. Alexander · Roseville, US
• Paul A. Martinson · Maplewood, US
• John Stuart Bolton · Lake Luzerne, US
• Seungkyu Lee · Oakland, US
• Thomas Herdtle · Inver Grove Heights, US
• Ronald W. Gerdes · Okabena, US

Key dates

• Filing date: Sep 9, 2015
• Grant date: Jul 16, 2019
• Expiry date: Sep 9, 2035

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F24F2013/245
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

Provided acoustic devices include an external housing defining an expansion chamber and a wall extending through and partitioning the expansion chamber into a central chamber and a peripheral chamber adjacent the central chamber, wherein an inlet and outlet communicate with the central chamber, and wherein the wall includes a plurality of apertures formed therethrough to allow air movement to and from the central and expansion chambers, the plurality of apertures sized to provide an average flow resistance ranging from 100 MKS Rayls to 5000 MKS Rayls. The acoustic devices advantageously show significant sound attenuation while streamlining air flow to reduce pressure drop across the expansion chamber.