ACOUSTIC SCREEN FOR DRIVE OF SPINDLES Russian patent published in 2016 - IPC E04B1/84 D01H13/14 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics, particularly, to broadband acoustic suppression. Acoustic screen for drive of spindles comprises a rigid wall, on which there is a layer of sound-absorbing material. Stiff wall is box-like shape enveloping drive spindle, and has process holes for heat removal. Fastened to the rigid wall additionally is element in the form of smooth and perforated walls. Located between the walls is sound-absorbing material arranged in two layers, one of which is harder, continuous and shaped, and the other is soft, discontinuous and placed in the focus of the sound reflecting surfaces of the first layer. Solid shaped layer of sound-absorbing material is made from material with sound reflection factor higher than that of sound absorption. Profiles are formed by spherical surfaces, connected to each other so that in each profile a solid dome profile is created, focusing the reflected sound on the same soft acoustic absorber, which is located in focus of the solid shaped layer made in the form of revolving bodies, for example in the form of balls, revolving ellipsoids, and is attached by means of rods parallel to the perforated wall and rigidly connected with smooth wall by vertical links.

EFFECT: higher efficiency of noise suppression due to improvement of sound absorption coefficient by increasing noise absorption surfaces while maintaining overall dimensions.

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