ACOUSTIC SCREEN FOR SPINDLE DRIVE Russian patent published in 2014 - IPC D01H13/14 

FIELD: textiles, paper.

SUBSTANCE: acoustic screen for the spindle drive comprises a rigid wall on which a layer of sound absorptive material is applied. The rigid wall is made box-shaped, it covers the spindle drive and has technological holes for heat abstraction. According to the invention, the rigid wall is additionally attached to the sound absorbing element which is made in the form of a smooth and a perforated walls, between which the sound absorbing material is located, placed in two layers, one of which, which is harder, is formed solid and profiled, and the other, which is soft, is made discontinuous and is located in the focus of the sound-reflecting surfaces of the first layer. The solid profiled layer of sound absorbing material is made of a material which coefficient of sound reflection is greater than the coefficient of sound absorption. The profiles are formed by spherical surfaces, interconnected so that, in general, each of the profiles forms an integral domed profile, focusing the reflected sound at the same soft sound absorber, which is located at the focus of the solid profiled layer made in the form of bodies of revolution, such as balls, ellipsoids of revolution, and is fastened by means of rods, parallel to the perforated wall and rigidly connected to the smooth wall by means of the vertical links.

EFFECT: increased efficiency of noise attenuation by improving the coefficient of sound absorption by increasing the surfaces of sound absorption while maintaining the overall dimensions.

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