Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1979-08-31
1981-05-19
Hix, L. T.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181273, F01N 108
Patent
active
042678994
ABSTRACT:
A muffler (10) for reducing the noise level of gases passing therethrough is disclosed. The muffler (10) includes a housing (12) including a longitudinally extending wall (14) and a pair of opposite end walls (16, 18). Baffle plates (32, 38, 42) divide the interior space of the housing (12) into a Helmholtz resonator chamber (34), a flow chamber (36), an inlet broad band attenuator chamber (40) and an outlet broad band attenuator chamber (44). An inlet tube (20) extends through an inlet port (21) in the end wall (16), through a hole (48) in the baffle plate (38) and through a hole (50) in the baffle plate (32). An outlet tube (22) passes through an outlet port (23) in the end wall (18), through a hole (52) in the baffle plate (42) and through a hole (54) in the baffle plate (32). Exhaust gases enter the muffler (10 ) through the inlet tube (20), pass through holes (62) into the flow chamber (36) and exit the muffler (10) through the outlet tube (22). Broad band attenuation of noise being carried by the exhaust gases occurs in the inlet and outlet attenuation chambers (40, 44) and in a nozzle member (80). Narrow band noise attenuation occurs in the Helmholtz resonator chamber (34).
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Wagner Wayne M.
Winnes David E.
Donaldson & Company, Inc.
Fuller Benjamin R.
Hix L. T,.
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