Patent ID: 8016071

Claim:
A muffler for a compressor, the muffler comprising: an outer wall defining an interior cavity having an inlet and an outlet; a first interior wall disposed within the cavity and having an opening thereon; a tube including an upstream end attached to the first interior wall around the opening, a closed downstream end, a plurality of holes disposed on a circumference of the tube, and a first plate disposed within the tube between the upstream and downstream ends, the first plate having an opening, the opening of the first plate and the plurality of holes having different shapes; a plurality of internal resonance disruptors projecting from the downstream side of the first interior wall; a second interior wall disposed within the cavity downstream of the first interior wall; at least three tubes extending through the second interior wall and arranged in a circular pattern, each of the at least three tubes having a length different from the length of any of the other of the at least three tubes to attenuate a range of sound frequencies.