46results about How to "Improve sound absorption efficiency" patented technology

The invention provides a noise reduction sound absorption layer. The sound absorption layer comprises a keel and a sound absorption component, wherein the component comprises a micro-perforated panel 2, non-woven fabrics 3, a bi-component fiber mat 1 and a back plate 4, which are sequentially arranged along the direction from a noise source to a wall. The sound absorption principle of the noise reduction sound absorption layer couples the effects of bi-component resistive sound absorption and dual-layer resonance sound absorption; low-frequency noise of a substation transformer and a high-voltage reactor is effectively absorbed, and thus the target of reducing sensitive points on the boundary of a transformer substation and sensitive points out of the transformer substation is achieved.

The invention discloses a sound absorption wall, which comprises an inner wall, alkali-free glass sound absorption cotton, metal acoustical boards and keels, wherein embedded elements are arranged in the inner wall; the keels are welded on the embedded elements; the metal acoustical boards are fixed on the keels through screw bolts and screw nuts; and a position between the inner wall and the metal acoustical boards is filled with the alkali-free glass sound absorption cotton. The metal acoustical board perforation rate of the sound absorption wall can reach 40 percent or above. Compared with the prior art, the sound absorption wall has the advantages that the sound absorption efficiency is greatly improved; the structural stability is very good; deformation is avoided; the service life is long; the metal sound absorption wall achieves a good fireproof effect, is nonflammable and has high sound absorption efficiency; the installing and fixing mode of the metal acoustical boards is simple; the single-piece fixation of the metal acoustical boards is realized; and the fixation of other metal acoustical boards cannot be influenced by the mounting or the dismounting of any one metal acoustical board.

The invention discloses an acoustic insulation cover, which comprises a cylindrical side wall and a top cover which is sealed and covered on the top of the side wall, wherein the side wall and the topcover independently comprise an acoustic absorption layer used for absorbing noise, and an acoustic insulation layer used for preventing noise from outwards radiating, and the acoustic absorption layer and the acoustic insulation layer are laminated and spliced from inside to outside. The acoustic insulation cover is characterized in that the acoustic absorption layer is internally at least provided with two acoustic absorption cotton layers; an acoustic absorption cavity is formed between the adjacent acoustic absorption cotton layers; and an acoustic absorption thin film capable of absorbing low and medium frequency noise is arranged in the acoustic absorption cavity. According to the acoustic insulation cover, the low and medium frequency noise can be effectively absorbed, acoustic absorption efficiency for the low and medium frequency noise is improved, noise reduction reliability is improved, convenience for a line to extend out is improved, the practicality of the acoustic insulation cover is improved, the thickness of an air layer in the acoustic absorption layer of the side wall in a use process is guaranteed, and therefore, the acoustic absorption efficiency and the acoustic absorption reliability of the acoustic absorption layer of the side wall are effectively improved. The invention also provides a design method for the acoustic insulation cover, and an acoustic insulation method for a compressor.

The invention discloses a water-based inorganic three-proofing coating and a preparation method thereof. The water-based inorganic three-proofing coating comprises the following components in parts byweight: 300 to 312 parts of water, 4 to 8 parts of a dispersant, 0.3 to 0.8 part of a neutralizer, 3 to 4 parts of an antifoaming agent, 180 to 200 parts of titanium dioxide, 180 to 200 parts of calcium carbonate, 3 to 5 parts of cellulose, 8 to 12 parts of an anionic organosilicon emulsion, 4 to 6 parts of a stabilizing agent, 210 to 220 parts of potassium silicate and 45 to 55 parts of a pure acrylic emulsion, wherein the anionic organosilicon emulsion comprises the following components: octamethylcyclotetrasiloxane, an emulsifier, deionized water, sodium hydroxide, gamma-glycidoxypropyltrimethoxysilane and a phenolic aldehyde amine curing agent. The water-based inorganic three-proofing coating has the advantages of suitability for low-temperature construction, high drying speed in a low-temperature environment, short curing time, high adhesive force and excellent sound absorption and noise reduction effect.

A sound absorbing structure having a wide sound absorbing frequency range and high sound absorbing efficiency. A sound absorbing structure (1) is provided with a housing (2) having on one surface thereof a surface plate (2a) constructed from a porous plate, and also with porous plate units (3) which are each constructed from porous plates and are mounted in the housing (2). The porous plate units (3) are arranged side by side in the direction of the surface of the surface plate (2a). The porous plate units (3) each composed of two flat surface sections (3a, 4a) facing the surface plate (2a), and of side surface sections (3b, 4b) respectively connected to the flat surface sections (3a, 4a) and extending in a direction crossing the surface plate (2a). The space in the housing (2) is partitioned by the flat surface sections (3a, 4a) into spaces arranged side by side in a depth direction perpendicular to the surface plate (2a) and is partitioned by side surface sections (3b, 4b) into spaces arranged side by side in the direction of the surface of the surface plate (2a).

The invention discloses a combined self-regulation sound barrier and relates to the technical field of treatment on sound pollution. The combined self-regulation sound barrier comprises a sound barrier body, and a plurality of cavities are formed in the sound barrier body. The combined self-regulation sound barrier further comprises a control unit and a plurality of sound absorption units made of porous materials. The sound absorption units are arranged in the cavities and fixed to the side walls of the cavities. Each sound absorption unit and the side wall of the corresponding cavity are provided with electromagnets corresponding to each other. The control unit comprises sound sensors and a controller, and the sound sensors and the electromagnets are all connected with the controller. By controlling stretching or compression of the sound absorption units, the porous structure inside each sound absorption unit is changed, the absorption capacity for sounds of various frequency bands is changed, the combined self-regulation sound barrier can absorb sounds in a more targeted mode, and the noise absorption capacity of the combined self-regulation sound barrier is improved.

The invention relates to the technical field of acoustical materials, and particularly relates to a preparation method of an acoustical material. Cogongrass is used as a substrate, and is treated by phenylenediamine, inner fibers of the cogongrass is hardened preliminarily, then the cogongrass is subjected to pre-carbonation, saccharides, lignin and the like on the surface of the cogongrass are partially pyrolyzed, surface active groups are exposed, acrylic acid and methyl methacrylate are polymerized under the effects of a conditioner and ammonium persulfate, meanwhile, the acrylic acid and the methyl methacrylate are combined to the exposed surface active groups, the combination degree is improved, silylation is also introduced, the degree of combination between acoustical materials is increased, weather resistance is improved, a net-shaped structure is formed, and the sound absorption efficiency is improved; and because enzyme is added in a polymerization process, on one hand, bioactivity is improved, on the other hand, the cogongrass subjected to pre-carbonation is subjected to enzymolysis by the enzyme, abundant pore structures are formed in the cogongrass, and the sound absorption efficiency is further improved.

The invention discloses a composite sound absorbing and insulating barrier. The composite sound absorbing and insulating barrier comprises a sound absorbing combined module, the sound absorbing combined module comprises an aluminum fiber microporous plate, and a waterproof and breathable du pont membrane, a carbon fiber sound absorbing cotton, an aluminum silicate acoustic baffle and a galvanized sheet shell are sequentially arranged on the aluminum fiber microporous plate. The composite sound absorbing and insulating barrier further comprises a sound absorbing combined module mounting bracket, the sound absorbing combined module mounting bracket comprises a plurality of mounting units composed of H-shaped steel, each mounting unit comprises the H-shaped steel on the left side, the H-shaped steel on the right side and beams on the upper portion and the lower portion, the mounting units are arranged on the upper row and the lower row, and a PC transparent screen is arranged between the mounting units on the upper row and the lower row. According to the composite sound absorbing and insulating barrier, the way of noise transmission is effectively blocked, the purpose of good noise governance is achieved, the field of vision cannot be blocked, after double sound insulation, the vibration effect is reduced, and the noise reduction effect is improved.

The invention relates to a sound-absorbing panel for a sound-proof room, which comprises a sound-absorbing panel body. One side of the sound-absorbing panel body is provided with an anti-collision layer made of PU foam, and one side of the anti-collision layer is provided with a sound-absorbing layer made of glass fiber sound-absorbing cotton. The sound-absorbing layer is provided with a plurality of first sound-absorbing ribs and a plurality of second sound-absorbing ribs. There is a reinforcement member, the reinforcement member includes a first reinforcement board and a second reinforcement board, the first reinforcement board is arranged vertically inside the sound-absorbing panel body, the number is one, and it is located in the center of the sound-absorbing board body, and the cross-section of the first reinforcement board is sawtooth shape; the second reinforcing plate is horizontally arranged inside the sound-absorbing panel body, and there are two in number, located at the upper and lower parts of the sound-absorbing panel body, and the cross-section of the second reinforcing plate has an S-shaped structure. The invention has the advantages of simple structure, high strength and good sound-absorbing effect.

The invention relates to an aluminum honeycomb ceiling board with a micro-perforated sandwich layer. The aluminum honeycomb ceiling board comprises an upper aluminum plate, a lower aluminum plate and the micro-perforated sandwich layer, wherein the micro-perforated sandwich layer is bonded between the upper aluminum plate and the lower aluminum plate, a plurality of breakable dotted line grooves are evenly formed in the micro-perforated sandwich layer in a penetrating mode, all the breakable dotted line grooves are connected end to end to form a closed ring, and a to-be-pushed sandwich block which is connected with the micro-perforated sandwich layer through a plurality of ribs is formed in the closed ring. According to the aluminum honeycomb ceiling board, protruding aluminum plates and grooves on the upper aluminum plate and the lower aluminum plate correspond to the to-be-pushed sandwich block on the micro-perforated sandwich layer, the protruding aluminum plates, the grooves and the sandwich block can be nested through pressing operation, sound absorption structures extend into the aluminum plates, the sound absorption area is increased, the sound absorption efficiency is improved, and the protruding aluminum plates extend into the micro-perforated sandwich layer and is used for supporting the micro-perforated sandwich layer, so that the micro-perforated sandwich layer is prevented from deforming and stripping, and the whole ceiling board has the advantages of high strength and good sound absorption effect.