| 摘要 |
A Helmholtz resonator is formed by a hollow casing defined on one part (22,11,12) by the peripheral lateral wall (8) of the ventilator fan group, whose interior forms a closed cavity (21) in the neighborhood of the exit (15) which communicates with the orifices (20) traversing this part of the wall with the air trajectory (4) in the interior of the ventilator fans The unit includes a turbine (1) surrounded by walls which define an air flow path (4), a central air input (7), a first transversal wall (5), and a second transversal wall (6) separated from the first in the direction of the turbine axis. There is a peripheral wall (8), connecting the peripheral edges of the walls (5,6), in which there is an air output (15). The group includes an absorption device for noise which includes a cavity (21) communicating with the air flow path (4). The cavity is adjacent to the peripheral wall (8) and communicates with the air path (4) via holes (20). The cavity (21) is practically closed except for the holes (20).
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