ELBOW OF NOISE BLOCKING BY VACUUM

摘要

PURPOSE: A vacuum noise preventing type elbow is provided to improve the efficiency of reducing noise by effectively blocking noise while preventing the degradation of the performance of the elbow even in long-term usage. CONSTITUTION: A vacuum noise preventing type elbow (EL) includes a vacuum unit (VA) which is formed into a hollow space of a vacuum state on an area of a thickness portion of an outer curved unit (OT) of the elbow. The transmission of noise generated inside the elbow is blocked by the vacuum unit. The vacuum unit is formed into a shape having a predetermined width lengthways along the curved surface of the outer curved unit. The vacuum unit is formed on a thickness portion of the outer curved unit.