EP 0029506 B1 19830907 - DEVICE FOR REDUCING THE NOISE OF EXHAUST OR OF WASTE GAS
Title (en)
DEVICE FOR REDUCING THE NOISE OF EXHAUST OR OF WASTE GAS
Publication
Application
Priority
DE 2947256 A 19791123
Abstract (en)
[origin: US4325458A] The noise of an exhaust gas flow of an internal combustion engine or other thermodynamic equipment is reduced by silators which are operatively arranged for deadening or absorbing the exhaust noise. Such silators have vaulted surfaces enclosing an evacuated volume which may include a cooling liquid. The silators have a resonance frequency that depends on the vaulting height and the free span or diameter of the vaulted surface. By properly dimensioning the silators and combining a plurality thereof each having a different resonance frequency, a wide frequency range of exhaust noises may be covered. Preferably the silator impedance is smaller than the air impedance of the environment. The silators are protected against the heat of the exhaust gases.
IPC 1-7
IPC 8 full level
F01N 1/02 (2006.01); F01N 1/22 (2006.01); F01N 1/24 (2006.01); F01N 7/00 (2006.01)
CPC (source: EP US)
F01N 1/02 (2013.01 - EP US); F01N 1/22 (2013.01 - EP US); F01N 2490/14 (2013.01 - EP US)
Designated contracting state (EPC)
FR GB IT
DOCDB simple family (publication)
EP 0029506 A1 19810603; EP 0029506 B1 19830907; DE 2947256 A1 19810527; DE 2947256 C2 19840913; JP H0152563 B2 19891109; JP S5685512 A 19810711; US 4325458 A 19820420
DOCDB simple family (application)
EP 80106431 A 19801022; DE 2947256 A 19791123; JP 16405280 A 19801122; US 20708880 A 19801114