A hybrid acoustic silencer for a motor vehicle includes an insertion loss layer tuned for good insertion loss properties at specific frequencies and an absorption layer tuned for good absorption properties at specific frequencies. The insertion loss layer is configured to be adjacent to a sound radiating surface of the motor vehicle and the absorption layer is configured to face outward from the sound radiating surface of the motor vehicle.

A hybrid acoustic silencer for a motor vehicle includes an insertion loss layer tuned for good insertion loss properties at specific frequencies and an absorption layer tuned for good absorption properties at specific frequencies. The insertion loss layer is configured to be adjacent to a sound radiating surface of the motor vehicle and the absorption layer is configured to face outward from the sound radiating surface of the motor vehicle.

A sheathing arrangement for an exhaust system of an internal combustion engine includes at least one sheathing element (18) with a sheathing element shell (19). On an inner side (30) of the sheathing element shell (19) insulation material (38) overlaps the inner side (30) in at least some areas. The inner side is to be positioned facing toward a component of an exhaust system (10), which component is to be sheathed. The insulation material (38) is fixed to the sheathing element shell (19) by means of at least one fastening element (40) passing through the sheathing element shell (19) and the insulation material (38).

Systems for and methods of evacuating air from a muffler while it is being filled with a fibrous material are disclosed.

Systems for and methods of evacuating air from a muffler while it is being filled with a fibrous material are disclosed.

Methods and systems for filling a muffler body with a fibrous material prior to completing assembly of the muffler body are disclosed.

Methods and systems for filling a muffler body with a fibrous material prior to completing assembly of the muffler body are disclosed.

The invention is related to a pulsation muffler (100) for a gaseous medium flow (107), which is supplied by a compressor. The pulsation muffler (100) comprises a housing (101) extending along a central axis with a medium flow inlet (106) and a medium flow outlet; several tubular absorber elements (108) concentrically arranged in the housing (10) and fluidically arranged one behind the other. Each tubular absorber element (108) is provided with an inlet area and an outlet area, positioned at an axial distance from each other. Between the respective radially adjacent wall sections of different absorber elements (108), a flow compartment (112, 114) is maintained for the medium flow (107).

The invention is related to a pulsation muffler (100) for a gaseous medium flow (107), which is supplied by a compressor. The pulsation muffler (100) comprises a housing (101) extending along a central axis with a medium flow inlet (106) and a medium flow outlet; several tubular absorber elements (108) concentrically arranged in the housing (10) and fluidically arranged one behind the other. Each tubular absorber element (108) is provided with an inlet area and an outlet area, positioned at an axial distance from each other. Between the respective radially adjacent wall sections of different absorber elements (108), a flow compartment (112, 114) is maintained for the medium flow (107).

Provided in the present invention are a muffler (2) for use in a refrigerating device and a refrigerating device. The muffler comprises an outer casing (23), an inner wall (24), and a sound absorbing material (26) provided between the inner wall and the outer casing, the inner wall defining a fluid inlet (21), a fluid outlet (22), and a fluid passage deflected between the fluid inlet and the fluid outlet, wherein at least a partial region of the inner wall is provided with perforations (241, 242, 243, 244), and the inner wall has a higher perforation rate at the inner side of the fluid passage than that at the outer side of the fluid passage. The muffler according to the embodiment of the present invention significantly reduces the sound and vibration of the refrigerating device.