30results about How to "Good sound absorption and noise reduction" patented technology

The invention discloses a high-power container type diesel generating set. The high-power container type diesel generating set comprises an auxiliary container, a power container and a connecting metal flexible pipe which is arranged between the auxiliary container and the power container, wherein the power container comprises a machine room and an electric appliance room, the machine room is internally provided with a diesel engine, a main generator, a starting motor, a storage battery and a charger, and the electric appliance room is internally provided with a high-voltage cabinet, a grounding cabinet and a control cabinet; the top part of the auxiliary container is in an open type, and a box door is in a shutter type; and the connecting metal flexible pipe comprises large-caliber steel wire braiding flexible pipes and small-caliber steel wire braiding flexible pipes, two large-caliber steel wire braiding flexible pipes are connected by adopting a movable flange, and two small-caliber steel wire braiding flexible pipes are connected by adopting a quick-change connector. According to the high-power container type diesel generating set disclosed by the invention, the generator and an auxiliary unit are respectively arranged in the two box bodies, the two box bodies are connected by adopting the steel wire braiding flexible pipes, and thus the high-power container type diesel generating set can effectively adapt to places with large environmental temperature difference and strong sandstorm and has the characteristics of noise reduction, shock absorption, easiness in disassembling and hoisting and the like.

The invention relates to the preparation method of an acupuncturing 3D sound-absorbing body. The preparation method comprises the following steps:(a) weighting the first polyester staple fiber and fiber A respectively; (b) then entering into the cotton rolling equipment to carry out opening and mixing;(c) the fiber after processed by the cotton rolling equipment entering into a cotton mixing machine for further uniform mixing;(d) entering into the combing equipment and forming a fiber network after opening; (e) the fiber network entering into a stacking device for stacking;(f) forming cellucotton after first acupuncturing of the stacked fiber network; (g) placing a cotton blanket on the cellucotton, then carrying out the second acupuncturing to form into a acupuncturing cotton blanket;(h) cutting the acupuncturing cotton blanket into acupuncturing cotton blanket blocks by the cutting equipment; (i) enabling the acupuncturing cotton blanket blocks to enter into the heat setting equipment for heat setting; and(j) squeezing the acupuncturing cotton blanket blocks by a mould, so as to obtain the acupuncturing 3D sound-absorbing body. The 3D sound-absorbing body provided by the invention has the effects of sound absorption, noise reduction and decoration.

The invention discloses a dry-process sound-absorbing ceiling for automobiles, which is formed by post-processing the ceiling slabs. The ceiling slabs are composed of 5-layer board structures, wherein the first layer board is made of weight ratio Made of 2-2.5:1 glass fiber and polyethylene rubber powder; the second layer is made of modified expanded polystyrene; the third layer is made of glass fiber modified polyethylene rubber powder : the fourth layer is made of modified expanded polystyrene; the fifth layer is made of glass fiber and polyethylene rubber powder with a weight ratio of 2-2.5:1, and the present invention is used to reduce the dry ceiling The weight of the product can be reduced, and the NVH sound absorption performance of the ceiling itself can be improved.

The invention proposes an environment-friendly and energy-saving material for the surface layer of sports venues, which belongs to the technical field of composite materials, and is prepared from the following raw materials in parts by weight: 30-50 parts of polyether diol, 10-20 parts of polyether triol, 3-10 parts of toluene diisocyanate, 2-5 parts of diphenylmethane diisocyanate, 4-8 parts of modifier, 3-7 parts of silicon-aluminum porous microspheres, 0.2-1 part of anti-settling agent, 0.5-1 part of zinc oxide 15-25 parts of mineral oil, 22-35 parts of white carbon black. The main material of the present invention is a polyurethane material. By adding the above-mentioned modified materials and additives, the prepared material has good properties such as flame retardancy, heat preservation, sound absorption and noise reduction, weather resistance and wear resistance, and anti-skid performance. The service life of the material has broad application prospects.

The invention discloses a sound-absorbing and environmentally friendly recycled asphalt concrete and its preparation process, relates to the technical field of asphalt concrete processing, and solves the problem that the asphalt concrete cannot effectively reduce urban noise during use due to its poor noise reduction stability question. It includes the following components in parts by weight: 75-80 parts of new aggregate; 4-6 parts of SBS modified asphalt; 0.2-0.3 parts of mineral powder; 16-22 parts of regenerated asphalt mixed old material; 0.04-0.08 parts of regeneration agent ; 2.5-4.5 parts of fiber filler; 4-6 parts of high-temperature-resistant sound-absorbing material; 3-3.5 parts of expanded vermiculite; 0.6-1.2 parts of water glass; 0.4-0.8 parts of microporous calcium silicate. The sound-absorbing and environment-friendly recycled asphalt concrete in the present invention has a good sound-absorbing and noise-reducing effect, can maintain good stability during use, and has a long overall service life.

The invention provides a sound absorption and noise reduction multi-layer blow-off pipe which comprises a pipe body. The pipe body comprises a PE layer used as a main body. A graphitic layer is arranged inside the PE layer. A hydrophobic anti-corrosion layer is arranged inside the graphitic layer. A fire-proof layer is arranged outside the PE layer. A sound absorption layer is arranged outside the fire-proof layer. A PVDF layer is arranged outside the sound absorption layer. A noise insulation layer is arranged outside the PVDF layer. An anti-oxidation layer is arranged outside the noise insulation layer. According to the blow-off pipe, the multiple layers of structures are compounded, the service life is long, and the sound absorption and noise reduction functions are achieved.

The invention discloses a laminating 3D (three-dimensional) sound absorber and a preparation method thereof. The laminating 3D sound absorber comprises a covering layer, a first polyester staple fiber mesh layer and a fiber cotton layer which are sequentially compounded, needled holes are uniformly distributed in the surface of the fiber cotton layer, the hole diameter of each needled hole is not larger than 2mm, the depth of each needled hole is larger than two thirds of the thickness of the fiber cotton layer, and needling density is 1.0 needle / cm<2>-1.5 needles / cm<2>. Recyclable polyester fibers are used as raw materials and do not contain harmful substances, the harmful substances cannot be released, the materials can be recycled, and fiber cotton and coverings are adhered together through molten first polyester staple fibers. After the laminating 3D sound absorber is attached onto a wall, a cavity can be formed by the laminating 3D sound absorber and the wall, keels are omitted, and vibration transfer of sound is decreased, so that sound absorption and noise reduction effects are preferably achieved. The laminating 3D sound absorber is fine in sound absorption effect, and particularly, low-frequency sound absorption effects are obviously improved.

The invention discloses a 3D sound absorption member and a preparation method thereof. The 3D sound absorption member comprises a first polyester staple fiber layer, wherein pricked holes are uniformly formed in the surface of the first polyester staple fiber layer; the diameter of each pricked hole is not lager than 2 mm; the pricking depth is larger than two thirds of the thickness of the first polyester staple fiber layer; and the pricking density is 1.0-1.5 needles / cm<2>. According to the 3D sound absorption member and the preparation method thereof, the polyester staple fibers are taken as raw materials; when the first polyester staple fiber layer is melted, the fibers are boned together, so that the 3D sound absorption member material is environment-friendly, doesn't release hazardous substances, and can be recycled; the 3D sound absorption member is attached onto a wall and can form a cavity with the wall body, keels are omitted, the vibration transmission of sound is reduced, and sound absorption and noise lowering effects can be well realized; and the material of the 3D sound absorption member is environment-friendly and easy to recycle, the prepared 3D sound absorption member has a good sound absorption effect, and particularly for low-frequency sound, the sound absorption effect is improved remarkably.

The invention is applicable to the technical field of household appliances and provides a muffler and a clothes treatment device. The above-mentioned muffler includes a body; a sound-absorbing part; it is sleeved on the outside of the body; wherein, an air channel is formed between the body and the sound-absorbing part, and the air channel includes a sound wave propagating around the inner surface of the sound-absorbing part Circular flow channel. The above-mentioned clothes treatment device includes the above-mentioned muffler, a fan, and a fan sound insulation assembly. The muffler can increase the contact area and contact time between the noise and the sound-absorbing parts by adopting a circular flow channel, which is beneficial to the sound-absorbing parts to better play the role of sound absorption and noise reduction, so that the noise generated by the clothing treatment device during actual use It has been effectively reduced and the comfort of users has been improved.

The invention provides a multi-functional short-staple rope twisting machine. The multi-functional short-staple rope twisting machine comprises anti-slip mats, left supporting legs, right supporting legs, a machine base, a U-shaped supporting frame, a rope twisting motor, a rotary disc, a linear sliding rail, U-shaped sliders, winged screws, rope twisting hooks, a rope taking and wheel replacing structure, a structure for coiling a rope after rope twisting, a rope twisting length measurement determining rail structure and an anti-overflow shield structure, wherein the anti-slip mats are transversely glued to the lower surfaces of the horizontal sections on the lower portions of the left supporting legs and the lower surfaces of the horizontal sections on the lower portions of the right supporting legs respectively. Due to the arrangement of a fixing rod, a movable sleeve, a fixing hook and a square-head bolt, the moving position of the fixing hook is easily adjusted according to the horizontal requirements of rope twisting, and it can be ensured that rope twisting work is smoothly conducted; due to the arrangement of an adjusting slider, a stainless steel sliding rail, a measurement ruler and an adjusting bolt, the rope twisting length is easily ensured, and the rope twisting length consistency can be ensured.