Patent ID: 7225504

Claim:
A noise suppressor for use with a vacuum air cleaner comprising: an enclosed casing ( 1 ) having an air intake end ( 2 ) and an air outlet end ( 3 ); a noise suppressing chamber ( 4 ) located between the air intake end ( 2 ) and the air outlet end ( 3 ); and an air intake area ( 6 ) located at the air intake end ( 2 ) and an air outlet area ( 7 ) located at the air outlet end ( 3 ), the air intake area ( 6 ) and the air outlet area ( 7 ) each having a plurality densely arranged elongate duct-shaped air exhaust microholes ( 5 ) in communication with the noise suppressing chamber ( 4 ), the microholes defining an air intake sectional area and an air outlet sectional area, respectively; wherein the air intake sectional area and the air outlet sectional area are smaller than a sectional area of the noise suppressing chamber ( 4 ) and air intake direction and air outlet direction of the air inlet area ( 6 ) and the air outlet area ( 7 ) have an included angle thereinbetween.