Patent ID: 6802388
Filing Date: 2004-10-12
Classification: F01N,F02M

Abstract:
A noise damper for pipelines carrying noise-laden gasses, said noise damper comprising an outside pipe having an inside surface, an admission side, and a discharge side; a plurality of diaphragm rings having respective outside surfaces in communication with the inside surface of the outside pipe; at least one aperture wall extending between at least two diaphragm rings with an outside surface in communication with at least the inside surfaces of the two diaphragm rings to form at least one resonance chamber between the two diaphragm rings, the aperture wall and the outside pipe; and at least one insert having an outside surface in communication with one of the inside surface of the outside pipe, the diaphragm rings and said at least one aperture wall, said at least one insert having a plurality of blind holes, the insert forming sub-lines for gas flow in the noise damper, and the blind holes opening into the sub-lines and having a depth of &lgr;/4 with reference to a wavelength &lgr; of a frequency to be damped.