SPHERICAL ACOUSTIC ABSORBER Russian patent published in 2018 - IPC E04B1/84 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to sound absorbers. Spherical sound absorber comprises active and reactive sound absorbers located on a rigid frame, which is made in a spherical shape with an internal spherical resonance cavity congruent to the frame, formed by a rigid continuous spherical shell equidistant to the outer perforated spherical shell, while the space between the spherical shells is filled with a sound-absorbing material, and the connection of the outer perforated spherical shell to the object, for example, the ceiling of the production premise, is made by means of an elastic damping element that allows to damp high-frequency oscillations and is pivotally connected to a suspension made in the form of a rod, one end of which is connected to a hinge mounted on the resilient damping element, and the other end is connected to a ring intended for its fixation on the object, and the spherical resonance cavity is rigidly connected to at least one sleeve with an axial hole serving as a neck of a Helmholtz resonator with an outer perforated spherical shell, and the space between them is filled with a sound absorber, and light fixtures are fixed on the outer perforated spherical shell, for example, LEDs located with a uniform pitch in planes parallel to the diametric plane and located in the lower part of the spherical shell. Spring-damping element, damping high-frequency oscillations and pivotally connected to the suspension, is made of three vibration damping layers. First layer is made of a dispersible resilient damping material, in which chips can be used. Second layer consists of woven elastic synthetic threads. Size of cells woven from elastic synthetic threads is 10÷15 % smaller than fractions of chips of vibration damping materials. Third layer is made of solid damping material, in which sponge rubber, needle-punched material, e.g. "Vibrosil" based on silica or aluminoborosilicate fiber, and nonwoven vibration damping material can be used.

EFFECT: high efficiency of soundproofing at high frequencies.

1 cl, 1 dwg