30results about How to "Sound absorption and noise reduction effect is good" patented technology

The invention relates to the field of kitchen appliances and aims at providing a low noise and large suction range hood. The low noise and large suction range hood comprises a main case provided with two inner side plates and a rear through hole located in the rear end, an air duct arranged in the main case, a smoke collecting hood arranged at the lower end of the main case, and a check valve arranged at the upper end of the main case. The low noise and large suction range hood further comprises two parallel micro perforated plates provided with silencing small hole sets, and two sound absorbing and noise lowering plates; the two opposite side ends of the air duct are each provided with an air inlet; the two micro perforated plates are opposite to the two air inlets one to one; and the two micro perforated plates correspond to the two inner side plates one to one and each press one sound absorbing and noise lowering plate to be connected with the inner side of the corresponding inner side plate. The low noise and large suction range hood has the large air volume and air pressure strong suction performance and is low in noise.

The invention discloses a silencing composite board used for an automobile. The silencing composite board comprises a sound insulation substrate, a sound absorption layer and a sound absorption panel layer are sequentially arranged on the surface of the sound insulation substrate from bottom to top, the surface of the sound absorption panel layer is coated with a fire-proof coating, the top face of the sound absorption layer is in a concave-convex saw tooth shape, and an adhesive coating is arranged on the bottom face of the sound insulation substrate. The silencing composite board is installed in an assembly gap of the automobile and has a good sound absorption and noise reduction effect; particularly, the top face of the sound absorption layer is in the concave-convex saw tooth shape, in this way, the sound absorption area of the sound absorption layer can be greatly increased, and the noise reduction effect is improved; meanwhile, the surface of the sound absorption panel layer is coated with the fire-proof coating, so that safety performance is improved; in addition, the adhesive coating is arranged on the bottom face of the sound insulation substrate, in this way, the silencing composite board can directly adhere to the automobile as long as a packaging film of the silencing composite board is disclosed, and installing is convenient.

The invention discloses a montmorillonite tailing ecological self-cleaning water permeable brick. After a carbonized treatment, carbonized peanut shell is ground at room temperature; the pore surface adsorbs a photocatalytic material nanometer titania; and light irradiation is conducted to generate hydroxyl radical, super-oxygen ion free radical and H2O free radical which have strong capacity of oxidization and decomposition to directly oxidize various organic matter into inorganic micomolecules such as CO2 and H2O, etc. By applying the above product into a water permeable brick, the water permeable brick can degrade automobile exhaust and the like in the atmosphere. In addition, the water permeable brick also has strong adsorbability and excellent sound absorption and noise reduction effects. Modified sugar filter mud is used as a pore-forming agent, and montmorillonite and broken stone are used as aggregate. The water permeable brick prepared after high-temperature sintering of the materials has large porosity, excellent self-cleaning effect, high compressive strength, better wear resistance and obvious water permeable effect, is not easy to block, and is not easy for ponding in rainy days. By effective utilization of slags, the product has obvious social, economic and environmental benefits.

The invention discloses a soundproof composite door. The soundproof composite door comprises a door panel and a door frame, the door panel comprises an inner soundproof board, an outer soundproof board disposed under the inner soundproof board and a frame which is connected with the inner soundproof board and the outer soundproof board through mortise and tenon and used for fixing the door panel.A first composite fiber board which is attached to the inner soundproof board and used for increasing the strength of the door panel is arranged on the lower surface of the inner soundproof board, anda second composite fiber board which is attached to the outer soundproof board and used for increasing the strength of the door panel is arranged on the upper surface of the outer soundproof board. Asound absorbing sponge layer is arranged between the first composite fiber board and the second composite fiber board. The soundproof composite door has the advantages of high hardness and good soundabsorption and noise reduction effects, is durable and safe and environmentally friendly, and is suitable for a variety of occasions.

The invention relates to the technical field of rock plate back coating material processing, and particularly discloses a two-component back coating material for a rock plate and a preparation method thereof, and the two-component back coating material is prepared from a powder mixture and a liquid mixture; the powder mixture is mainly prepared from the following raw materials: quartz sand, ordinary Portland cement, cement-based capillary crystalline master batch, hydroxyethyl cellulose, dispersible latex powder, diatomite, bamboo charcoal powder and aluminum oxide; the liquid mixture is mainly prepared from the following raw materials: a water-based polymer emulsion, 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, sodium citrate, a penetrating agent, a wetting agent and a silane coupling agent. According to the two-component back coating material, the synergistic effect of the raw materials is utilized, so that the two-component back coating material has relatively high bonding strength, thermal aging resistance and freeze-thaw resistance, shows good bonding stability and sound absorption and noise reduction effects, meets the market requirements and expands the application range.

The invention relates to a sound-absorbing noise-reducing ceramic assembly. The sound-absorbing noise-reducing ceramic assembly comprises at least one sound-absorbing noise-reducing ceramic unit; the sound-absorbing noise-reducing ceramic unit is multichannel cellular ceramic, and the channel inner wall of the multichannel cellular ceramic is in a porous structure. The ceramic assembly has excellent sound-absorbing and noise-reducing functions, and is suitable for sound-absorbing space indoor and outdoor, and is especially suitable for being used in outdoor sound-absorbing noise-reducing engineering such as highway, high speed railway, tunnel and subway, and the ceramic assembly has the obvious effect for absorbing sound and reducing noise, and has the advantages of convenient construction, good weatherability and environmental protection.

The invention relates to a preparation method for a sound absorption and noise reduction material used for pneumatic tyres. The preparation method comprises the following steps that HXNBR is added toperform mixing after the temperature of a double-roller open mixing machine is set to be constant, then hollow polyester fiber is added, after the mixing is performed evenly, graphene fiber is added to continue to perform the mixing, and an HXNBR / hollow polyester fiber / graphene fiber mixture is obtained; the mixture is placed into a mold to be put into a slab vulcanizing machine and taken out after being pressed, then cooling demolding is performed, and an HXNBR / hollow polyester fiber / graphene fiber composite material is obtained; and the composite material is placed into the mold to be pressed and bonded with a nonwoven material after being placed into a constant temperature oven for preheating, and the sound absorption and noise reduction material is obtained. The preparation method forthe sound absorption and noise reduction material used for the pneumatic tyres is simple in step and easy to operate; by means of the preparation method for the sound absorption and noise reduction material used for the pneumatic tyres, the obtained sound absorption and noise reduction material has good sound absorption and noise reduction effect, and tyre noise is reduced by 10% or above; and bymeans of the preparation method for the sound absorption and noise reduction material used for the pneumatic tyres, the graphene fiber is introduced in, the fatigue resistance of the sound absorptionand noise reduction material is improved, and the service life of the sound absorption and noise reduction material is prolonged.

The invention discloses a double-faced sound absorption and noise reduction device of a railway track, and an installation method thereof. The railway track comprises a plurality of sleepers (1) and steel rails (2) erected on the plurality of sleepers (1), the sound absorption and noise reduction device is installed on the steel rail (2) on a suspended segment between adjacent sleepers (1), the sound absorption and noise reduction device comprises two double-faced sound absorption boards (3), the two double-faced sound absorption boards (3) are respectively adhered on two sides of the steel rail (2) on the suspended segment through adhesion layers (4), each double-faced sound absorption board (3) comprises an upper sound absorption panel (31) and a lower sound absorption panel (32), the upper sound absorption panel (31) is arranged toward the upper side of the railway track, and the lower sound absorption panel (32) is arranged toward the bottom of the railway track. The sound absorption and noise reduction device has the advantages of easy implementation, low cost and good sound absorption and good noise reduction effect.

The invention provides a preparation method for an engine cover lid. The method comprises the following steps: after a skin layer generating agent is subjected to reaction and injection moulding, a skin layer with a wavy structure is obtained; a micro perforated plate is placed on the wavy surface of the skin layer, a foam layer generating agent is poured on the micro perforated plate, and mold closing is carried out; and after molding is performed, mold opening is carried out, and therefore the engine cover lid is obtained. The engine cover lid provided by the invention includes a foam layerand the skin layer covering the foam layer, wherein the foam layer is rich in foam and the micro perforated plate, so that noise generated by an engine can be better absorbed; the wavy surface of theskin layer can reflect the noise from the engine back to the foam layer, thereby prolonging the standing time of the noise in the foam layer, giving play to better sound-absorbing and noise-reducing effects, and facilitating acquirement of better mute of a cab; and at the same time, the non-wavy surface of the skin layer has a good appearance, so that the visual requirements of users can be met.

The invention provides a nonwoven fabric wheel casing which at least comprises a thermoplastic plastic frame and a nonwoven fabric located in the thermoplastic plastic frame.The thermoplastic plastic frame keeps the overall shape of the nonwoven fabric wheel casing and is connected with a bumper bar and an automobile body.The thermoplastic plastic frame is prepared from, by weight, 100 parts of thermoplastic polyolefin, 0.05-15 parts of inorganic filler, 0.01-5 parts of glass fiber, and 0.01-5 parts of halloysite nanotubes.The nonwoven fabric is prepared from, by weight, 100 parts of polyester fiber and 20-45 parts of polypropylene fiber.The nonwoven fabric is stable in performance, good in sound insulation effect, capable of being used in common conditions and capable of better meeting special requirement of rain, snow and other severe weather and complex road conditions for the wheel casing.

The invention discloses a soundproof composite door. The soundproof composite door comprises a door panel and a door frame, the door panel comprises an inner soundproof board, an outer soundproof board disposed under the inner soundproof board and a frame which is connected with the inner soundproof board and the outer soundproof board through mortise and tenon and used for fixing the door panel.A first composite fiber board which is attached to the inner soundproof board and used for increasing the strength of the door panel is arranged on the lower surface of the inner soundproof board, anda second composite fiber board which is attached to the outer soundproof board and used for increasing the strength of the door panel is arranged on the upper surface of the outer soundproof board. Asound absorbing sponge layer is arranged between the first composite fiber board and the second composite fiber board. The soundproof composite door has the advantages of high hardness and good soundabsorption and noise reduction effects, is durable and safe and environmentally friendly, and is suitable for a variety of occasions.

The invention discloses a permeable asphalt admixture, permeable asphalt and a permeable asphalt pavement. The preparation raw materials of the permeable asphalt admixture comprise the following components in parts by weight: 0.5 to 1.5 parts of an emulsifying agent, 1 part of a dispersing agent, 2 to 4 parts of a capillary pore forming agent and 0.01 to 0.06 part of a catalyst. The permeable asphalt is prepared by uniformly mixing the permeable asphalt admixture and asphalt. The permeable asphalt pavement contains the permeable asphalt admixture. According to the permeable asphalt admixture,the permeable asphalt and the permeable asphalt pavement, the problems of early loosening, easiness in gap blockage in use, low strength, great construction difficulty and high cost in the existing permeable asphalt pavement are solved, and the permeable asphalt pavement has the advantages that the construction performance is excellent, the cost is low, the constructed permeable asphalt pavement is compact in structure and high in strength, gaps are not easily blocked in use, the continuous permeability is high, and the anti-fouling and anti-blockage performance is high.

The invention relates to a sound-absorbing noise-reducing ceramic assembly. The sound-absorbing noise-reducing ceramic assembly comprises at least one sound-absorbing noise-reducing ceramic unit; the sound-absorbing noise-reducing ceramic unit is multichannel cellular ceramic, and the channel inner wall of the multichannel cellular ceramic is in a porous structure. The ceramic assembly has excellent sound-absorbing and noise-reducing functions, and is suitable for sound-absorbing space indoor and outdoor, and is especially suitable for being used in outdoor sound-absorbing noise-reducing engineering such as highway, high speed railway, tunnel and subway, and the ceramic assembly has the obvious effect for absorbing sound and reducing noise, and has the advantages of convenient construction, good weatherability and environmental protection.

The invention provides an environmentally-friendly energy-saving stone saw blade and a machining process thereof, and relates to the field of cutting tools. In order to overcome defects in the prior art, the environmentally-friendly energy-saving stone saw blade which has the advantages that the noise is reduced through noise suppression, the deadweight is light, the energy is saved through weight reduction, the efficiency is high, the environmentally-friendly property is achieved, the structure is simple, and the operation is simple and convenient as well as the machining process of the environmentally-friendly energy-saving stone saw blade are provided. The environmentally-friendly energy-saving stone saw blade comprises a saw blade body and saw teeth which are annularly distributed on the edge of the saw blade body, wherein the saw blade body comprises a metal part and a composite part; the composite part sleeves the metal part, and comprises a carbon fiber, a glass fiber, and two or three mixtures of the carbon fiber and the glass fiber; the carbon fiber, the glass fiber, and two or three mixtures of the carbon fiber and the glass fiber are laid in a layer manner, thereby forming a carbon fiber layer, a glass fiber layer and a mixed layer; and the space between every two adjacent layers is coated with epoxy resin glue, thereby forming a bonding layer. The machining process comprises the following steps: preparing materials; laying the composite materials of the composite part; and compacting the composite part.

The invention discloses an acoustic damping composite material and a preparation method thereof. The acoustic damping composite material comprises the following raw materials in parts by weight: 15 to20 parts of textile fiber, 10 to 15 parts of mixed sol, 1 to 2 parts of a surfactant, 20 to 25 parts of thermoplastic polyurethane, 10 to 15 parts of melamine, 5 to 10 parts of lignocellulose, 4 to 6parts of white carbon black, 1 to 2 parts of carbon nanotubes, 1 to 2 parts of acetyl tributyl citrate, 1 to 2 parts of boron nitride, 1 to 2 parts of hydroxypropyl starch, 1 to 2 parts of glycerinum, and 8 to 10 parts of normal octane. The acoustic damping composite material is simple in preparation technology, and cheap and available in the raw materials, avoids the use of environment-harmful lead, and is good in sound absorption and noise reduction effect.