Noise attenuation device for compressor inlet duct

A noise attenuation device (160) configured to be inserted between an air intake pipe (140) and an air inlet (16) of a turbocharger compressor (3), the noise attenuation device (160) comprising

• a hollow cylindrical body including
• a tapered inner surface (166),
• one end corresponding to a minimum diameter portion (162) of the tapered inner surface (166),
• another end opposed to the one end and corresponding to a maximum diameter portion (164) of the tapered inner surface (166), and
• an outer surface (165) that includes
• an outwardly-protruding, circumferentially-extending first flange (180),
• wherein the noise attenuation device (160) is configured to be disposed coaxially within the air inlet (16) in a manner such that the minimum diameter portion (162) is downstream with respect to direction of air flow through the air inlet (16) relative to the maximum diameter portion (164), and the first flange (180) engages a corresponding groove (154) formed on an inner surface of the air inlet (16) at a location spaced apart from an inlet end (17) of the air inlet (16), whereby the body is secured within the air inlet (16).

An exhaust gas turbocharger (1) comprising:

• a turbine (2) including a turbine housing (11) and a turbine wheel (4) disposed in the turbine housing (11);
• a compressor (3) including
• a compressor housing (12) defining a cylindrical air inlet (16);
• a compressor wheel (5) disposed within the compressor housing (12) adjacent to the air inlet (16), the compressor wheel (3) connected to the turbine wheel (4) via a shaft (6);
• an air intake pipe (140) connected to the air inlet (16), the air intake pipe (140) comprising:
• a first end (146);
• a second end (148) opposed to the first end (146), the second end (148) connected to the air inlet (16);
• a longitudinal axis (152) extending between the first end (146) and the second end (148);
• and
• a noise attenuation device (160) protruding inward from, and extending circumferentially about, an inner surface (144) of the air intake pipe (140) adjacent the second end (148), wherein the noise attenuation device (160) is tapered along an axial direction of the air intake pipe (140) such that a minimum diameter portion (162) of the noise attenuation device (160) is disposed at the second end (148).