Compressor muffler

In combination with a hermetic gas compressor having a housing and having a given pumping frequency at its outlet, a muffler mounted within the compressor housing comprising:

• a housing having an inlet in fluid communication with the compressor outlet, at least two chambers separated by a partition wall, an inlet tube in one of said chambers adapted to permit gas flow into said one of said chambers, said inlet tube being in fluid communication with the housing inlet, an elongated tube having an inlet end in said one chamber and an outlet end the other of said chambers adapted to permit gas flow from said one chamber to said other chamber, an intermediate portion of said elongated tube extending out of said other chamber and returning to said other chamber and being disposed entirely outside said one chamber and said other chamber, an outlet in said other chamber, said muffler being tuned such that its sound attenuation and impedance characteristics are each substantially zero at the compressor pumping frequency and the attenuation increasing at frequencies above the pumping frequency.