Silencer or noise damper

US6802388B2 · kind B2 · utility

Assignee

• Woco Franz-Josef Wolf & Co. GmbH · DE

Inventors

• Franz J. Wolf · Salmünster, DE
• Udo Gartner · Steinau an der Straße, DE
• Josef Hohmann · Bad Bederkesa, DE
• Anton Wolf · Gelnhausen, DE

Key dates

• Filing date: Feb 13, 2003
• Grant date: Oct 12, 2004
• Expiry date: Apr 27, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M35/1266
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a silencer (1) for noise-laden gas pipes, especially for a suction pipe and/or an exhaust pipe of an internal combustion engine, comprising an outer pipe (2) with an inlet side (3) and an outlet side (4), a plurality of diaphragm rings (9, 9′, 9″, ′″, 9″″) each with an outer surface connected (5) to the inner surface of the outer pipe (2), at least one insert (6) with an outer surface connected (7) to the inner surface of the outer pipe (2) and/or the diaphragm rings (9, 9′, 9″, 9′″, 9″″) and with a plurality of openings (8) which are closed on one side. Said insert (6) forms sub-pipes for the gas flow in the silencer, and the openings (8), which are closed on one side, open into the sub-pipes, the depth thereof being /4 in relation to the wavelength of a frequency to be silenced. At least one perforated wall (10, 10′, 11, 11′), extends between at least two diaphragm rings (9, 9′, 9″, 9′″, 9″″) whereby an outer surface is connected (7) to at least one inner surface of the two diaphragm rings (9, 9′, 9′″, 9″″, …