Sound absorber unit and wheel with sound absorber device

A sound absorber unit, configured to be mounted on a moving part in a gas environment to reduce sound resonance, wherein the sound absorber unit is constructed as a hexahedral box body and is formed as a three-layer Helmholtz resonance sound absorbing structure that combines double holes with single holes, and the box body has two side surfaces that define the boundaries of two ends of the box body in the movement direction of the moving part, wherein an open end side surface is formed at one end and has an opening leading into a hollow cavity in the box body, and a closed end side surface is formed at the other end;

• the interior of the box body is divided by a first partition plate and a second partition plate into a first hollow cavity, a second hollow cavity and a third hollow cavity, which are arranged in succession along the movement direction of the moving part;
• wherein pipe orifices of two first hollow pipes are formed in the open end side surface, the pipe orifices of the first hollow pipes are open toward the gas environment space, and the first hollow pipes extend into the first hollow cavity by distances corresponding to the pipe lengths thereof;
• wherein a pipe orifice of a second hollow pipe is formed in the first partition plate, the pipe orifice of the second hollow pipe is open toward the first hollow cavity, and the second hollow pipe extends into the second hollow cavity by a distance corresponding to the pipe length thereof;
• wherein pipe orifices of two third hollow pipes are formed in the second partition plate, the pipe orifices of the third hollow pipes are open toward the second hollow cavity, and the third hollow pipes extend into the third hollow cavity by distances corresponding to the pipe lengths thereof;
• and
• wherein the first hollow cavity, the second hollow cavity and the third hollow cavity form three resonant cavities for layering of the three-layer Helmholtz resonance sound absorbing structure.