Muffler for a fan, particularly for an internal combustion engine

摘要

The muffler for a fan, especially a bypass air fan of an internal combustion engine, has a housing provided with an air outlet opening and an air inlet opening and including a housing pot having a top opening and a flat housing cover at least partially closing the top opening of the housing pot, the air inlet opening being coaxial to the housing axis and advantageously provided in the housing cover, and a damping insert made from a sound absorbing material and being provided with at least one helical or spiral air flow passage providing a connection between the air outlet opening and the air inlet opening so that air can flow through the air inlet opening to the air outlet opening. In one variation the air outlet opening can open radially from the housing pot and the air inlet opening can be provided centrally in a flat housing cover. In another variation the air outlet opening includes two throughgoing openings of approximately equal diameter provided in the housing cover and spaced an equal distance from the housing axis and the damping insert is made from a plurality of substantially equal disks stacked one on the other in the housing pot of the housing.