Device for sound damping in air flows in e.g. vacuum cleaner, has sound damping element including edge provided with protrusions and recesses, which increase length of edge, where damping element is made of metallic material or plastic

摘要

The device has a sound damping element (2) including an edge (3) provided with protrusions (4) and recesses (5), which increase length of the edge. The damping element is made of metallic material or plastic. The element includes a textile with warping threads, weft threads and pores present between the warping and weft threads. The element tapers a cross-section flow-through by air in a direction of the edge. The projections are formed by hairs, bristles, teeth or marks extending away from a base body (2a) of the element.