Patent ID: 8122732

Claim:
A refrigerator having a noise reduction structure comprising: an impeller part 12 compressing refrigerant; a condenser 14 condensing the compressed refrigerant; and a refrigerant discharge pipe 16 connecting the impeller part 12 and the condenser 14 , wherein the refrigerator further comprises a branch pipe 20 that is provided to an outer periphery of the discharge pipe 16 to bypass the refrigerant flowing in the discharge pipe 16 to an outside in a predetermined section, wherein a traveling sound wave 22 of the refrigerant branched through an end of the branch pipe 20 from the discharge pipe 16 is converted into a reverse sound wave 24 having an inverse phase to the traveling sound wave 22 flowing in the discharge pipe 16 while traveling in the branch pipe 20 , and wherein the reverse sound wave 24 re-joins into the discharge pipe 16 at the other end of the branch pipe 20 and is thus cancelled with the traveling sound wave 22 , and wherein a diameter of the branch pipe 20 is between 25% and 100% of a wavelength of the travelling sound wave 22 .