The invention relates to a suction muffler in a reciprocating compressor. The suction muffler is installed over a suction valve in order to attenuate complex sound pressure (noise) such as vibrational noise, valve sonance and flowing noise and pulsative noise which is produced from the suction valve when refrigerant gas in low temperature and pressure ejected from an evaporator is sucked into a cylinder via the suction valve and a suction portion of the cylinder. Further, a Tesla valve having the two distribution paths is mounted within the suction muffler in order to attenuate the complex sound pressure (noise) such as vibrational noise, valve sonance and flowing noise and pulsative noise produced from the suction valve while prevent the reflow of the refrigerant gas into the suction muffler from the suction valve. The Tesla valve prevents the reflow of the refrigerant gas into the suction muffler to enhance the cooling ability of the compressor while enhance the attenuation effect of the complex sound pressure (noise) transferred from the suction valve. |