Ventilation installation including a sound absorption device

Abstract

Ventilation installation comprising a sound absorption device The present invention relates to a ventilation installation (1) for a motor vehicle, comprising at least one duct (3) configured to participate in guiding an air flow (4) and comprising an internal face (5) defining a passage of the air flow (4), characterized in that the internal face (5) of the at least one duct (3) comprises a sound absorption device (6) comprising: a perforated wall (7) provided with a plurality of openings, a layer of dissipative material (8) interposed between the perforated wall (7) and the internal face (5) of the duct (3), the layer of dissipative material (8) being in direct contact with at least the perforated wall (7). (figure 1)

Claims

Claims

1. Installation (1) for ventilation of a motor vehicle, comprising at least one duct (3) configured to participate in guiding an air flow (4) and comprising an internal face (5) defining a passage of the air flow (4), characterized in that the internal face (5) of the at least one duct (3) comprises an acoustic absorption device (6) comprising at least: - a perforated wall (7) provided with a plurality of openings (9) and - a layer of dissipative material (8) interposed between the perforated wall (7) and the internal face (5) of the duct (3), the layer of dissipative material (8) being in direct contact with at least the perforated wall (7).

2. Installation (1) according to claim 1, in which the layer of dissipative material (8) is in direct contact with the internal face (5) of the conduit (3).

3. Installation (1) according to claim 1, in which the acoustic absorption device (6) is arranged so as to form a layer of air (12) between the layer of dissipative material (8) and the internal face (5) of the duct (3).

4. Installation (1) according to any one of the preceding claims, wherein the openings (9) of the perforated wall (7) extend over an area of between 1% and 20% of a total area of the perforated wall (7).

5. Installation (1) according to any one of the preceding claims, in which a diameter (Y) of the openings (9) is between 0.5mm and 10mm.

6. Installation (1) according to the preceding claim, in which the diameter (Y) of all the openings (9) is identical.

7. Installation (1) according to claim 5, in which at least two openings (9) of the same perforated wall (7) have diameters (Y) which differ from one opening (9) to the other.

8. Installation (1) according to any one of the preceding claims, in which a distance (Z) between a center of two adjacent openings (9) of the perforated wall (7) is between 1mm and 15mm.

9.

10.

11. Installation (1) according to any one of the preceding claims, in which the sound absorption device (6) has a total thickness (E) of between 5 mm and 80 mm. Installation (1) according to any one of the preceding claims, in which the perforated wall (7) is a rigid plate. Installation (1) according to any one of claims 1 to 9, in which the perforated wall (7) is a flexible membrane.

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