Internal noise reducing pipe for flexible coolant and sound wave circulating pipe of air-conditioning installation in car, has portion possessing bend similar to that of flexible pipe to conserve ability to reduce influence of sound waves

摘要

The pipe (CI) has two linear rigid portions (P1, P2) coupled together by an intermediate deformable portion (PI) defining a low expansion deformable zone (ZD). Each rigid portion has a local bend similar to a local bend subjected by a flexible fluid and sound wave circulating pipe (CF) for conserving the ability to reduce influence of sound waves circulating in the flexible pipe. A through-hole (TT) locally defines an interference zone to partially absorb the sound waves. The deformable intermediate portion comprises a wall provided with annular deformations (DF) having identical sections. The sections possess triangular, rectangular slot or sinusoidal shape.