56results about How to "Guaranteed sound absorption performance" patented technology

The invention provides a rectangular array cylindrical draught fan silencer. The rectangular array cylindrical draught fan silencer comprises a silencer pipe body, wherein an inlet air counter flangeis arranged at an inlet end of the silencer pipe body, an air outlet counter flange is arranged at an outlet end of the silencer pipe body, an air outlet variable diameter shrinkage segment is arranged at one end of the silencer pipe body, an air inlet variable diameter expansion segment is arranged at the other end of the silencer pipe body, and a part, between the air inlet variable diameter expansion segment and the air outlet variable diameter shrinkage segment, of the silencer pipe body, is set as a noise elimination straight cylinder segment. The rectangular array cylindrical draught fansilencer is simple in structure and reasonable in design, enables inlet air to enter noise elimination through holes in a columnar noise elimination plate along inlet air noise elimination channels by using the air noise elimination channels among adjacent noise elimination columns, and thereby achieves noise control, controls noise below 85 decibels, reduces influence from high noise to workers,and then improves work efficiency of the workers, and furthermore can prevent that second wind noise is caused due to the fact that the inlet air hits the noise elimination columns and guarantee noise elimination effects by using stream guidance arcs installed at air inlet ends of the noise elimination columns.

The embodiment of the invention discloses double-sided black polyester sound-absorbing cotton. The double-sided black polyester sound-absorbing cotton comprises a first non-woven fabric layer, a second non-woven fabric layer and a sound-absorbing cotton layer. The upper surface of the sound-absorbing cotton layer is attached to the lower surface of the first non-woven fabric layer. The lower surface of the sound-absorbing cotton layer is attached to the lower surface of the second non-woven fabric layer. The first non-woven fabric layer comprises the following components in parts by weight: 95-99 parts of polyester material, 0.5-4 parts of carbon black, and 0.5-1 part of carbon black dispersing agent. The second non-woven fabric layer comprises the following components in parts by weight:95-99 parts of polyester material, 0.5-4 parts of carbon black, and 0.5-1 part of carbon black dispersing agent. The sound-absorbing cotton layer comprises the following components in parts by weight:95-99 parts of PET polyester fiber, 0.5-4 parts of white carbon black and 0.5-1 part of carbon black dispersing agent. The double-sided black polyester sound-absorbing cotton is convenient to process, high in sound-absorbing performance and high in decoration performance.

The invention provides a sound-absorbing and sound-insulation material. The sound-absorbing and sound-insulation material comprises the following components in parts by weight: 10-15 parts of rubber,10-15 parts of PVC, 10-15 parts of a foaming agent, 18-24 parts of a filler, 3-7 parts of carbon black, 17-22 parts of paraffin, 2-5 parts of chlorinated polyethylene, 1-5 parts of slab beeswax, 1-4 parts of soybean oil, 0.5-3 parts of a surfactant and 0.5-4 parts of calcium stearate. By adding a mixed material comprising the PVC, the rubber and the foaming agent, and optimizing the usage amountsof the components, the purpose that the prepared material has large and small holes can be effectively achieved; and the overall sound-absorbing performance of the sound-absorbing material is effectively ensured.

The invention discloses a filter device for pharmaceutical equipment, which belongs to the technical field of pharmaceutical equipment, and includes a casing for filtering medicine; a plurality of vibration cleaning components used to improve the cleaning effect of the filter structure are installed in the casing The present invention can effectively avoid the eccentric movement of the lifting screw caused by long-term work by setting the screw stabilizing component inside, and ensure the good rotation effect of the threaded drum matched with it. At the same time, the vibration can be effectively passed through the flexible guide. The vibration rubber is transmitted to the vibration dredging shaft, and the vibration dredging shaft can vibrate. The design is ingenious. On the one hand, the flexible shock-conducting rubber can effectively reduce the vibration of the stabilizer sleeve and ensure the use effect of the stabilizer sleeve. On the other hand, it can effectively utilize the vibration , The vibrating vibration dredging shaft can effectively dredge the feeding pipe to avoid blockage in the feeding pipe, and can use the unavoidable invalid vibration to turn waste into treasure and improve the use effect of the device.

Provided is a pneumatic tyre in which a sound-absorbing material is effective in absorbing sound during high-speed travel and the sound-absorbing material can be prevented from separating or breakingin low temperatures. A pneumatic tyre provided with: a tread part (1) which extends in the circumferential direction of a tyre so as to form a ring shape; a pair of sidewall parts (2) arranged on therespective sides of the tread part (1); and a pair of bead parts (3) arranged on the inner sides, in the radial direction of the tyre, of the sidewall parts (2), wherein a sound-absorbing material (6)is fixed, via an adhesive layer (5), to the inner surface of the tread part (1), along the circumferential direction of the tyre, and when the temperature t of the sound-absorbing material (6) is atleast in the range -20 degrees to 80 degrees, the rupture elongation y [%] of the sound-absorbing material (6) satisfies the relationships y>=t+100 and y<=2t+440 with respect to the temperature t of the sound-absorbing material (6).

The invention provides a convenient-to-adjust communication equipment sound absorption device, which comprises a sound absorption box, iron sheets, a ventilation opening, a cooling shell, a heat dissipation motor, heat dissipation blades, an air outlet, an air exhaust net, an air inlet and an air inlet net. The upper and lower parts of the front part of the right side of the sound absorption box are in screw connection with the iron sheets. A ventilation opening is formed in the middle of the right portion of the inner side of the sound absorption box. A cooling shell is arranged on the rightside of the ventilation opening and connected with the sound absorption box through screws. Through the arrangement of the sound absorption piece, the mounting plate, the movable plate, the U-shaped sliding block, the linear sliding rail and the square head bolt, communication equipment can be fixedly mounted, the sound absorption position can be adjusted, the sound absorption and noise reductioneffects are guaranteed, the communication equipment can be mounted and fixed through the mounting plate, sound absorption is conducted through the sound absorption piece, and according to the operation requirement, The square-head bolt can be loosened, the position of the U-shaped sliding block on the outer wall of the linear sliding rail is moved and adjusted, and after the position is determined, the square-head bolt is locked, so that operation convenience is guaranteed.

The invention discloses a mixed plant-based polyurethane porous material impregnated with carbon nanotubes and graphene oxide. The polyurethane sound-absorbing material is prepared by using castor oil polyol and rosin ester polyol instead of petroleum-based polyol. The material has a wide range of sources and is easy to degrade. Environmental pollution is reduced, and the addition of carbon nanotubes increases the weight of the material under the same volume, which further enhances the high-frequency sound absorption effect of the material. The impregnation of graphene oxide increases the complexity of the material inside, making it have better mid-low frequency Sound absorption and compression properties. At the same time, the present invention also provides a method for preparing a mixed plant-based polyurethane porous material impregnated with carbon nanotubes and graphene oxide. Different stirring speeds are used in the material preparation process to ensure that the materials are evenly mixed, and the heat preservation treatment and drying treatment are given. The appropriate temperature value at the time and the effective temperature control not only ensure the foaming effect and drying effect, but also ensure the sound absorption and compression properties of polyurethane materials.

The invention relates to the technical field of titanium-zinc plates, and discloses a heat-resistant and corrosion-resistant titanium-zinc plate. The heat-resistant and corrosion-resistant titanium-zinc plate comprises a metal base plate. Supporting profile steel is fixedly connected to the top of the metal base plate, wiping strips are fixedly connected to the top of the supporting profile steel,a heat insulation layer is fixedly connected to the top of the supporting profile steel, and a sound absorption bottom plate is fixedly connected to the top of the heat insulation layer. According tothe heat-resistant and corrosion-resistant titanium-zinc plate, the supporting profile steel, the wiping strips and the heat insulation layer are arranged on the top of the metal base plate, and therefore the good supporting performance is provided for the whole structure through the transverse and vertical connection of the supporting profile steel and the wiping strips advantageously; the soundabsorption bottom plate, supporting strips, a sound absorption layer and an air isolation layer are arranged on the tops of the wiping strips, the sound absorption layer and the supporting strips arefixed in a penetrating and inserting mode, and therefore the sound absorption effect of the whole structure is improved conveniently. Meanwhile, the supporting strips ensure the stability of a soundabsorption structure, and the air isolation layer effectively avoids the phenomenon that due to the fact that the moisture enters the sound absorption structure, the sound absorption performance is reduced.

The invention discloses an ultra-light and high-performance sound-absorbing material with a carbon fiber and down layered structure. The cross section of the rubber pad is I-shaped, and the two ends of the rubber pad are used for bonding with the carbon fiber layer and the down sound-absorbing layer with adhesive, and the gap of the rubber pad is filled with down with a filling density of 30-50%; the down sound-absorbing layer The down sound-absorbing layer is composed of a composite fiber hollow pipeline group filled with down in a horizontal and vertical direction. The composite fiber hollow pipeline group is composed of a certain number of composite fiber hollow pipelines arranged side by side. The composite fiber hollow pipelines are bonded by adhesive. And each composite fiber hollow pipeline is filled with down with a filling density of 70-85%. The invention utilizes the laminated structure design of the carbon fiber layer and the down sound-absorbing layer, so that the sound-absorbing material has ultra-light weight and strong sound-absorbing effect at the same time.