7results about How to "Strong sound absorption" patented technology

According to the thin-layer sound absorption superstructure composite acoustic enclosure and the using method, the acoustic enclosure is composed of the cover plate, the conformal frame, the thin-layer sound absorption superstructures and the porous sound absorption materials, the variety of the thin-layer sound absorption superstructures is not limited to one, and the broadband noise reduction effect can be achieved through the parallel superposition design of the thin-layer sound absorption superstructures and the porous sound absorption materials. Wherein the thin-layer sound absorption superstructure can absorb noise in different frequency ranges of medium and low frequency bands, the porous sound absorption material can absorb noise in medium and high frequency bands, and the working bandwidth of the composite acoustic shield after parallel connection and superposition can cover the low, medium and high wide frequency bands. The thin-layer sound absorption superstructure composite acoustic shield further has the advantages of being high in space utilization rate, high in space adaptability, small in thickness, low in surface density and high in material replaceability. Compared with an existing sound insulation cover, on the premise that the thickness is small and the surface density is low, the working frequency band is wider, the sound insulation effect is better, and the sound insulation cover has wide application prospects in noise control of various mechanical and electrical products.

The invention relates to a preparation method and application of a multifunctional needled glass fiber aerogel felt. The invention discloses a multifunctional needled glass fiber aerogel felt which is prepared by the following steps: adding a catalyst, tetraethyl orthosilicate, ethanol and deionized water into a beaker in parts by weight, uniformly stirring, putting the needled glass fiber felt into a solution, aging, drying and modifying to finally obtain the needled glass fiber aerogel felt, and the catalyst is ammonia water or hydrochloric acid. The needled glass fiber aerogel felt not only can play a role in heat insulation and fire prevention, but also can absorb sound and reduce noise, and is a multifunctional high-quality material.

This utility model provides a composite perforated wood-plastic composite sound-absorbing wall panel, relating to the technical field of building materials. The composite perforated wood-plastic composite sound-absorbing wall panel comprises, from top to bottom, a veneer layer, a wood-plastic composite layer, and a sound-absorbing layer. The veneer layer has evenly distributed through-holes, and the wood-plastic composite layer has sound-absorbing grooves. The through-holes and sound-absorbing grooves are interconnected, and the sound-absorbing grooves are dovetail grooves. The total thickness of the wall panel is ≤19mm. This utility model achieves a significant improvement in the sound absorption performance of the composite wall panel by designing through-holes in the veneer layer, designing sound-absorbing grooves communicating with the through-holes in the wood-plastic composite layer (designing the sound-absorbing grooves in the dovetail groove form), and then designing a sound-absorbing layer on the bottom surface of the wood-plastic composite layer. The sound absorption principle of this utility model is: using the Helmholtz resonance principle, combined with the oblique wall reflection of the dovetail groove and the excellent sound absorption performance of the wood-plastic composite material itself, to achieve a synergistic effect and significantly improve the sound absorption performance of the composite wall panel.

The utility model discloses a heat insulation and heat preservation gel structure which comprises a base plate assembly, the top of the base plate assembly is fixedly connected with a medium layer, the top of the medium layer is fixedly connected with a colloid layer, a heat insulation layer is arranged on the right side of the base plate assembly in a penetrating mode, and the front face and the back face of the base plate assembly are fixedly connected with heat preservation layers. A mineral wool layer is arranged in the heat insulation layer and used in cooperation with the heat insulation layer, a polystyrene board layer is fixedly connected to the bottom of the mineral wool layer and used in cooperation with the mineral wool layer, and a polyurethane foaming material layer is fixedly connected to the bottom of the polystyrene board layer. The polyurethane foaming material layer is used in cooperation with the polystyrene board layer. According to the gel structure, the phenomenon that the traditional heat insulation and heat preservation effect is poor is changed, various heat insulation and heat preservation materials are adopted for heat insulation and heat preservation treatment, the phenomenon of heat loss cannot occur in the using process, and the phenomenon that the using quality of gel cannot be guaranteed is avoided.

The utility model relates to the technical field of water saving of faucets, and discloses a water-saving faucet shell which comprises an outer shell, a protection assembly is fixedly connected to the outer side of the outer shell, a water stop assembly is arranged in the outer shell, and a flow guide assembly is fixedly connected to one end of the outer shell. According to the water-saving faucet shell, through the arrangement of the water stop assembly and the flow guide assembly, when the water-saving faucet shell is used, water flow impacts a connecting plate, so that an extrusion spring is in a compressed state, a water stop plug moves, the water flow enters a mounting box, and a flow guide plate in the mounting box combs and guides the water flow, so that water outlet is more uniform and gentle; when the faucet is closed, the spring is extruded to drive the connecting plate and the water stop plug to reset, and the water stop plug is tightly attached to a water flowing pipeline, so that the water flow is completely blocked, it is ensured that the faucet does not drip water or leak water, and water resource waste caused by water leakage and water dripping is reduced.

The invention discloses a perforated plate composite material as well as a preparation method and application thereof, and relates to the field of sound-absorbing materials. The composite material comprises a perforated plate and foamed silicone rubber which are stacked, wherein the foamed silicone rubber comprises silicone rubber, an ABS flame retardant, white carbon black, an AC foaming agent, an organic tin curing agent, a sulfur accelerator, sublimed sulfur, TiO2 and glass fibers. The mechanical strength, ductility and elasticity are greatly improved by vulcanizing the silicone rubber, the density and pore size distribution of the rubber are changed by adding multiple inorganic fillers, the sound absorption effect on low and medium frequency noise is good, meanwhile, the sound absorption efficiency of the sound absorption plate in a medium frequency band or a medium-high frequency band can be guaranteed, the perforated plate is mainly used for sound absorption of medium and high frequencies, and the sound absorption effect is good. Under the combined action of the two components, the requirement for wide-frequency noise absorption can be met, the production cost is low, and the production process is environmentally friendly and harmless.

The present invention provides a foam ceramic building block and a preparation method and a use method thereof. The raw materials of the building block include: 100 parts of a main material, 5 to 20 parts of a pore-forming agent, and 5 to 10 parts of a filler. Tap water tail mud, aluminum ash, flue ash and sulfuric acid slag are ground into powder as the main material, at least one of boron mud, carbide slag and industrial salt mud is dried and ground into powder as a pore-forming agent, at least one of pine nuts, castor beans and Spartina alterniflora powder is crushed as a filler, the above raw materials are mixed to form embryos, calcined and cooled to obtain building blocks. The foam ceramic building blocks prepared by the present invention are adhered to each other by applying a masonry agent. The foam ceramic building block has the characteristics of strong mechanical properties, good thermal insulation effect and excellent sound absorption capacity, and is of great significance in the fields of improving the comprehensive utilization rate of solid waste and developing energy-saving building materials.