In-line constricted sound-attenuating system

• US 5,123,501 A
• Filed: 10/21/1988
• Issued: 06/23/1992
• Est. Priority Date: 10/21/1988
• Status: Expired due to Term

• Current Assignee: Donaldson Company Incorporated
• Original Assignee: Donaldson Company Incorporated
• Inventors: Rothman, James C., Monson, Donald R., Reinhart, Charles O.
• Primary Examiner(s): Fuller, Benjamin R.
• Assistant Examiner(s): Yockey, David
• Application Number:
  US07/260,818
• Time in Patent Office: 1,341 Days
• Field of Search: 181/247, 181/227, 181/264, 181/269, 181/272, 181/239
• US Class Current: 181/239
• CPC Class Codes: F01N 1/08 by reducing exhaust energy by throttling or whirling
• CPC Class Codes: F01N 13/08 Other arrangements or adaptations of exhaust conduits pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005
• CPC Class Codes: F01N 13/082 of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation F01N13/20 takes precedence
• CPC Class Codes: F01N 2470/02 Tubes being perforated
• CPC Class Codes: F01N 2470/10 Tubes having non-circular cross section
• CPC Class Codes: F01N 2470/14 Plurality of outlet tubes, e.g. in parallel or with different length
• CPC Class Codes: F01N 2490/16 Chambers with particular shapes, e.g. spherical

Abstract

A sound attenuating device is provided for attenuating noise in an exhaust system. The attenuating device includes an inlet end, an outlet end and a constricted portion therebetween. In use, the attenuating device may be disposed in a tubular housing or may be an integral portion of a tail pipe, connecting pipe, or muffler. Further, a sound suppressing system is described including one or more attenuating regions including attenuating devices. The attenuating regions are spaced to attenuate desired frequencies. Expansion chambers formed between attenuating regions contribute to sound suppression.

Claims

1. A sound attenuating device comprising:

(a) a tubular housing having an inlet end and at least two outlet ends, with a generally T-shaped intersection portion between the inlet and outlet ends; and

(b) a constricting member having inner and outer surfaces disposed within said housing and located at said T-shaped intersection portion, and said constricting member being constructed and arranged within said housing such that a constricted channel is defined between said inlet and outlet ends by said tubular housing and said constricting member outer surface, said channel including a converging portion toward said inlet end and a diverging portion toward said outlet end and a throat portion having a point of maximum constriction, said constricting member being disposed in said T-shaped intersection portion such that a cavity is defined between said housing and said inner surface of said constricting member, and said constricting member including perforations allowing fluid communication between said cavity and said channel.