Louver flow muffler
US4111279A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1976 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Jul 26, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2490/155
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A muffler for lowering the exhaust gas noise level of combustion engines has a Helmholtz resonator chamber and a single straight tube member that is provided with a perforated portion outside said chamber large enough for full flow through it of all gas flowing through the muffler, one end of the tube extending into the resonator chamber and the tube diameter, chamber volume, and length of the tube between said one end and said perforated portion being related to and dependent upon each other in accordance with the Helmholtz formula so that the resulting Helmholtz system attenuates a predetermined frequency when the muffler is placed in an exhaust system at or near the pressure antinode of that frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.