FLOATING COVER FOR ULTRASONIC CLEANER (ALTERNATIVES) Russian patent published in 1994 - IPC

FIELD: cleaning of materials in liquids. SUBSTANCE: in cover having set of positive-buoyancy members hinged to one another to form a chain one end of the chain is connected to cleaner body. The chain members are made of sound-absorbing material. The cross sectional dimensions of the members are not less 2/γ1s

, where γ1s is the decay coefficient of the sound wave in the sound-absorbing material. The clearance between the members is chosen from the condition λ_o/4≅ a≅ λ_o, where λ_o is the length of the sound wave in air. In addition, to augment sound- proofing effect of the cover the matching layer may be created on the surface of the chain members adjacent to working liquid and the partitions may be arranged inside the members to perform the resonant sound attenuation. Another of cover alternatives is the cover where upper surfaces of the chain members are made of sound- insulating material and all other surfaces are made of sound-absorbing material, and where the thickness of the sound absorbing material l₁≥ λ_surface/4, and the dimension of the sound absorbing surface t₁ along the member height is not less than the double value of clearance between the members. EFFECT: extended operating capabilities. 8 cl, 25 dwg