Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1977-12-02
1979-01-30
Tomsky, Stephen J.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181267, 181279, F01N 110, F01N 112
Patent
active
041367570
ABSTRACT:
An absorption muffler for flowing gases and particularly for exhaust gases from internal combustion engines comprises a housing which is of oblong shape and has spaced apart semicylindrical short side walls, with long side walls on each side which are synclinally drawn in the middle thereof. Parallel inlet and outlet pipes are connected into the front wall and extend substantially up to the rear wall, and they are located in substantially parallel relationship centered within the respective short side wall semicylindrical portions. An inlet channel is defined on the interior of the housing which extends in a helical curve around the inlet pipe, which in one embodiment has a single convolution and in another embodiment has a plurality of convolutions. This inlet channel connects to a similarly constructed outlet channel designed around the outlet pipe through an obliquely extending connecting channel. The inlet channel comprises either a single convolution or a plurality of convolutions. Both the inlet and the outlet pipes are enveloped with a spacing by a surrounding wall, which has an unperforated surrounding wall portion which overlies a perforated portion of the respective inlet or outlet. Sound damping material is provided along the length of the inlet and the outlet channels and the connecting channel, and fills the wall space between adjacent convolutions of the inlet and outlet channels and the space between either one of the convolutions and the wall of the chamber, and between the connecting channel and the wall of the housing.
REFERENCES:
patent: 3066755 (1962-12-01), Diehl
patent: 3927731 (1975-12-01), Lancaster
Eberspacher J.
Tomsky Stephen J.
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