Sound deadening device

Abstract

A sound deadening device has an introducing and damping section. The introducing and damping section includes an introduction section that introduces fluid, an expansion chamber, and a lead-out section. The expansion chamber is communicated with the introduction section, has a flow passage cross-section larger than a flow passage cross-section of the introduction section, and has protrusions along a travelling direction of a sound wave, resonance of the sound wave being to be suppressed. The lead-out section is communicated with the expansion chamber, has a flow passage cross-section smaller than that of the expansion chamber, and leads out the fluid in a direction different from an introduction direction of the fluid. Accordingly, it is possible to weaken the resonance of the sound wave, suppress rise of inner sound pressure of the sound deadening device, and prevent reduction in a sound deadening effect.

Dependencies are inferred from the claim text.