399results about How to "Improve sound absorption" patented technology

The invention relates to an underwater sound absorption structure, underwater equipment and a preparation method of the underwater sound absorption structure, and relates to the technical field of shock absorption and noise reduction. The underwater sound absorption structure comprises a honeycomb dot matrix structure, the honeycomb dot matrix structure comprises a honeycomb supporting structure and a plurality of honeycomb type cells arranged in the honeycomb supporting structure, each honeycomb type cell comprises a damping layer component, a resonance unit and a cavity structure are arranged in each damping layer component, and the resonance units are arranged in the cavity structures. And the resonance units are closer to the tops of the honeycomb type cells than the cavity structures. The underwater sound absorption structure can still maintain high sound absorption capacity under high hydrostatic pressure, and a good sound absorption effect can be maintained in low-frequency, intermediate-frequency and high-frequency sound absorption frequency ranges under high pressure.

The invention discloses a preparation method of a composite sound-absorbing material for a motor home, and relates to the technical field of sound-absorbing materials, the preparation method comprises the following steps: S1, preparing a functional polymer; step S2, modifying the graphene sponge; step S3, preparation of functional fibers; step S4, surface modification; and S5, preparing the composite sound-absorbing material. The composite sound-absorbing material is good in weather resistance and mechanical property and remarkable in sound-absorbing effect.

The invention relates to the technical field of sound-absorbing materials, in particular to a foaming sound-absorbing material with a high aperture ratio structure and a preparation method and application thereof.The foaming sound-absorbing material comprises one or more of polylactic acid, poly (adipic acid) / butylene terephthalate and polyhydroxyalkanoate, the density of the foaming sound-absorbing material is 0.04-0.08 g / cm < 3 >, and the porosity of the foaming sound-absorbing material is 20-30%. The aperture ratio of the foaming sound absorption material is higher than 60%. According to the invention, the polymer foaming sound absorption material with high aperture ratio can be prepared without adding other fillers and assistants, the prepared foaming sound absorption material has the characteristics of high aperture ratio, small density and the like, and the foaming sound absorption material can realize efficient absorption of sound waves in a thickness range of 10 mm.

The invention provides an oil well optical cable for underground earthquake monitoring. The oil well optical cable comprises an optical fiber; the steel wire rope is coated with a rubber coating layer, the optical fiber is embedded in the surface of the rubber coating layer, and the optical fiber and the rubber coating layer are integrated; the outer layer of the optical fiber protection tube is coated with a sheath, and the steel wire rope is placed in the optical fiber protection tube; the high-temperature ointment is filled between the optical fiber protection tube and the rubber coating layer; and the outer-layer protection pipe adopts a high-strength seamless stainless steel pipe and is used for protecting internal elements. According to the oil well optical cable for underground earthquake monitoring, special packaging of the optical fibers is realized, mechanical protection of the optical fibers can be effectively realized, invasion of water, oil and other corrosive gases in an underground high-temperature and high-pressure environment can be avoided, the vibration sensing sensitivity of the optical fibers can be ensured, and the vibration sensing accuracy is improved. Effective physical and chemical protection can be achieved during optical fiber working, and hydrogen loss is reduced.

The invention relates to the field of earmuff products, in particular to a high-flexibility attached earmuff and a preparation method thereof. The high-flexibility attached earmuff structurally comprises an outer protection layer located at the top, a sound absorption layer located in the middle and a flexible layer located at the bottom. The flexible layer is prepared from the following raw materials in parts by mass: 30 to 40 parts of polyether polyol, 20 to 30 parts of polyisocyanate, 5 to 10 parts of a foaming agent, 1 to 2 parts of a catalyst, 1 to 2 parts of a stabilizer, 3 to 5 parts of a flame retardant, 1 to 2 parts of an antioxidant and 5 to 15 parts of a filling agent. The earmuff product prepared by the invention not only has an excellent sound insulation effect, but also can effectively ensure that the earmuff product has good moisture resistance, water resistance, aging resistance, mechanical quality and other properties, and is especially suitable for environments requiring long-time wearing, such as the fields of music production, industrial operation and the like.

The invention discloses a dry-type air-core reactor without glass fiber yarns, and relates to the technical field of air-core reactors, the dry-type air-core reactor comprises a reactor body, a first support is fixedly mounted on the bottom surface of the reactor body, one end of the first support is fixedly connected with a wiring terminal, the bottom surface of the first support is fixedly connected with a plurality of groups of porcelain columns, and the porcelain columns are fixedly connected with a plurality of groups of glass fiber yarns. The bottom end of the porcelain column is fixedly connected with a footstand, a second support is fixedly installed at the top of the electric reactor body, a buckle is arranged on the second support, a fixing block is fixedly installed in the buckle, a clamping groove is formed in the fixing block, the clamping groove is formed in the second support in a clamped mode, and the second support is fixedly installed on the electric reactor body. A pair of arm plates is fixedly installed on the two sides of the buckle, and a supporting block is fixedly connected between the other ends of the pair of arm plates. The electric reactor tray is reasonable in structure, the buckle can be fixed to the second support through the fastening assembly, and then the electric reactor in the tray is fixed through cooperative use of the butt joint assembly and the adjusting assembly.

The invention provides a sound insulation putty layer and a preparation method and application thereof, and relates to the technical field of building materials. Specifically, the sound insulation putty layer comprises bottom putty, middle putty and surface putty which are sequentially covered, and the bottom putty directly covers the surface of a wall body; wherein the bottom putty comprises white cement, heavy calcium carbonate powder, silica fume, rubber powder, barite powder, iron powder, latex powder, fibers and cellulose ether, the middle putty comprises white cement, heavy calcium carbonate powder, silica fume, floating beads, rubber powder, fibers, latex powder, aerogel and cellulose ether, and the surface putty comprises white cement, light calcium carbonate powder, silica fume, floating beads, fibers, latex powder, aerogel and cellulose ether. The sound insulation putty layer can absorb sound in different frequency ranges, the sound insulation performance in various frequency ranges is remarkably improved, and the comfort and quality of living and working environments are improved.

A sound-absorbing and sound-insulating module for a vehicle includes a perforated plate defining a plurality of apertures, a sound-absorbing material that is porous and disposed on the perforated plate, and a sound-insulating material disposed on the sound-absorbing material. The perforated plate, the sound absorbing material and the sound insulating material are sequentially combined. The diameter of the apertures, the number of apertures, and the distance between the apertures are determined based on the noise frequency band, thereby efficiently responding to various frequency bands of noise generated by one or more portions of a particular component of the vehicle.

The invention relates to the technical field of air conditioning equipment, in particular to an air treatment air cabinet. The air handling air cabinet comprises a shell, an air duct is arranged in the shell, and the air duct comprises an air return channel, a heat exchange channel and an air supply channel which are sequentially arranged in the air flow direction; the air return channel and the air supply channel are arranged side by side in parallel, so that the air channel is of a U-shaped structure. The heat exchanger comprises a filter module, a heat exchange module, a fan module and a silencing module. According to the embodiment of the invention, the air duct is arranged to be of the U-shaped structure, so that the flowing path of air in the air cabinet is more reasonable, the air flowing resistance is reduced to a certain extent, and the air treatment efficiency is improved. Due to the fact that the filtering module is mainly installed in the air return channel, the space occupied by the filtering module is sufficient, under the condition of the same air passing area, the filtering module can be thicker, the whole unfolded filtering area is larger, the service life is longer, and the replacement period of the filtering module is greatly prolonged.

The invention discloses a super wear-resistant mute felt material and a preparation method thereof. The felt material comprises the following preparation raw materials in percentage by mass: 30-70% of nylon fiber / bio-based polyamide fiber; 6-15% of graphene polyester fiber; 20-60% of polypropylene fiber; the thickness of the felt material ranges from 1 mm to 24 mm, and the gram weight ranges from 300 gsm to 2400 gsm. According to the invention, the material ratio is optimized, the performance advantages of each component material are fully exerted, the bio-based material and the environment-friendly finishing agent are selected, the influence on the environment is reduced, the interwoven structure and porosity among the fibers are improved by adjusting the physical characteristics of the fibers, such as thickness, length and cross section shape, the attraction coefficient can reach 0.72-0.81, and the mechanical properties of the fibers are improved. The felt has the advantages that the felt is high in wear resistance, can resist reciprocating wear for 200,000 times at most, can effectively control sound absorption, sound insulation balance and super wear resistance, is endowed with excellent waterproof, oil-proof and antifouling properties, can be applied to various occasions, and has a good application prospect.

The utility model discloses a nonmetal sound barrier unit plate which comprises a plurality of cement-based sound absorption panels arranged in parallel, a pouring inner mold is arranged on the back side face of each cement-based sound absorption panel, and a back cavity is defined by the pouring inner molds and the cement-based sound absorption panels. Concrete pouring structures are arranged on the periphery of each cement-based sound absorption panel and the pouring inner mold and the back side face of the pouring inner mold, the concrete pouring structures located on the back side face of the pouring inner mold form a back plate, and the concrete pouring structures located between the adjacent cement-based sound absorption panels and the pouring inner mold form joints. The concrete pouring structures located on the outermost peripheries of all the cement-based sound absorption panels and the pouring inner mold form side plates, and reinforcing steel bars are arranged in the side plates in the length direction and the height direction of the unit plates correspondingly. The nonmetal sound barrier unit plate has the advantages of being safe and reliable in structure and excellent in sound absorption and insulation performance and mechanical performance.

The invention relates to a sealing strip and an automobile, and the sealing strip comprises a sealing part and an acoustic metamaterial structure; the sealing part forms an accommodating cavity; the acoustic metamaterial structure is arranged in the accommodating cavity; the acoustic metamaterial structure comprises a cavity structure and an acoustic metamaterial unit arranged on one side of the cavity structure; wherein the cavity structure is provided with a resonant cavity, and the resonant cavity is provided with a first opening close to the acoustic metamaterial unit; the acoustic metamaterial unit comprises a film and a mass block, the film blocks the first opening of the resonant cavity, and the mass block is arranged on the side, away from the resonant cavity, of the film. The sound insulation and noise reduction capacity of the sealing strip is high.

The multifunctional triangular grating underwater sound absorption structure comprises a plurality of cells arranged in an array mode, each cell comprises a triangular prism with a cavity, a top plate of each triangular prism is provided with an open hole, a pipeline is embedded in each open hole, and a supporting column is embedded in each pipeline; the structure can be used for manufacturing an underwater sound absorption layer, has excellent underwater sound absorption capacity and pressure bearing capacity, can be selected according to working condition requirements by adjusting the structure size, and has wide engineering application prospects.

The invention discloses a composite heat-conducting and sound-absorbing material as well as a preparation method and application thereof. The composite heat-conducting and sound-absorbing material comprises a porous matrix, a sound-absorbing material filled in pores of the porous matrix, and heat-conducting aerogel formed in the pores of the porous matrix, gaps between the porous matrix and the sound-absorbing materials and / or gaps between the sound-absorbing materials are filled with the heat-conducting aerogel, and the heat-conducting aerogel and the sound-absorbing materials are interwoven to form a three-dimensional net-shaped structure. The porous matrix is filled with the sound absorbing material, the aerogel is formed in situ between the porous matrix and the sound absorbing material, the three-dimensional network structure formed by interweaving the aerogel can effectively fix the sound absorbing material and prevent the sound absorbing material from falling off under the condition that a binder is not used, meanwhile, the specific surface area of the product can be increased through introduction of the aerogel, and the sound absorbing effect is improved. The sound absorption effect of the product is further improved; in addition, the heat conduction aerogel with the three-dimensional network structure can improve the heat conduction capability of the product, so that the product has a good application prospect in electronic devices with sound absorption and heat dissipation requirements, such as loudspeakers and the like.

The utility model discloses a ship pipeline heat insulation and noise reduction wrapping structure which comprises two protective shells, pipelines are arranged in the two protective shells, heat insulation layers are arranged in the protective shells, sound absorption layers are arranged on the outer sides of the heat insulation layers, wear-resistant layers are arranged on the outer sides of the sound absorption layers, and the wear-resistant layers are arranged on the outer sides of the wear-resistant layers. Rubber rings attached to the outer side of the pipeline are installed at the opening positions of the front faces of the two protection shells. The utility model relates to the technical field of ship pipeline treatment, through the cooperation of the rock wool layer, the heat insulation layer and the sound insulation cotton, the heat insulation and sound absorption of the pipeline are improved, the influence of external noise and high temperature is avoided, and the problems that the heat insulation and noise reduction effects of an existing structure on the pipeline are common and the noise is poor are solved. And the normal working temperature of other equipment in the cabin is further influenced.

The utility model discloses an antibacterial automobile carpet sound insulation pad which comprises a carpet sound insulation pad body, carpet burrs are arranged at the upper end of the carpet sound insulation pad body, porous silica gel is installed on the outer wall of the carpet sound insulation pad body, a copper sheet and a zinc sheet are installed on the surface of the porous silica gel, and a rubber suction cup is connected to the bottom of the carpet sound insulation pad body. A wear-resistant layer A is arranged on the outer layer of the carpet sound insulation pad main body, a bamboo fiber layer A is connected to one side of the wear-resistant layer A, a sound insulation cotton layer A is connected to one side of the bamboo fiber layer A, a carpet base layer is connected to the bottom of the sound insulation cotton layer A, a sound insulation cotton layer B is arranged on one side of the carpet base layer, a bamboo fiber layer B is connected to one side of the sound insulation cotton layer B, and a wear-resistant layer B is connected to the bottom of the bamboo fiber layer B; according to the carpet sound insulation pad, the unique design of the carpet sound insulation pad body enables noise in an automobile to be obviously reduced. Due to the arrangement of carpet burrs, the attractiveness of the carpet is improved, and meanwhile the comfort level of passengers is improved.

The invention discloses a closed-cell foamed aluminum sandwich ultra-high-performance lightweight concrete road guardrail, belongs to the technical field of road guardrails, and aims to solve the problems of poor durability, large dead weight and low anti-collision deformation capability of a current concrete guardrail. Comprising a guardrail foundation and a plurality of guardrail walls, the guardrail foundation is in a long-strip plate shape, the guardrail walls are detachably connected with the guardrail foundation, and the guardrail walls are sequentially matched in an inserted mode in the length direction of the guardrail foundation; the guardrail wall body comprises a closed-cell foamed aluminum plate and a second lightweight concrete skin, the closed-cell foamed aluminum plate is vertically arranged, second reinforcing meshes parallel to the closed-cell foamed aluminum plate are arranged on the two sides of the closed-cell foamed aluminum plate, and the closed-cell foamed aluminum plate and the two second reinforcing meshes are poured into the second lightweight concrete skin. Vehicle impact is resisted through the second lightweight concrete skin, the closed-cell foamed aluminum plate is used for deforming and absorbing impact energy, the strength of a rigid guardrail is achieved, and the advantages of buffering and energy absorption of a flexible guardrail are achieved.

The invention relates to a multilayer special-shaped section sound absorption material and a preparation method thereof. The multilayer special-shaped section sound absorption material comprises a special-shaped layer, a bottom layer and a plurality of supporting assemblies evenly distributed between the special-shaped layer and the bottom layer. The supporting assemblies, the special-shaped layer and the bottom layer define a cavity. The special-shaped layer is of a multi-layer laminated structure, and the multiple layers are independently selected from any one of a linear layer, a circular layer and a pentagram-shaped layer and are different from one another; wherein the cross section of fibers used by the straight-line-shaped layer is straight-line-shaped; the cross section of the fiber used by the circular layer is circular; and the section of the fiber used by the pentagram-shaped layer is pentagram-shaped. When sound waves penetrate through the special-shaped layer, the sound waves can be reflected back and forth and spread among the linear layer, the circular layer and the pentagram-shaped layer of the special-shaped layer, and therefore sound energy can be further consumed, and the multilayer special-shaped section sound absorption material has good sound absorption performance.

The utility model discloses a fireproof acoustic board not easy to fall off, and relates to the technical field of acoustic boards, the fireproof acoustic board comprises a frame body, the interior of the frame body is of a hollow structure, cover plates are arranged on the two sides of the frame body, and a polyester fiber board, a foam board, a silencing board and a waterproof impermeable board are sequentially arranged in the frame body; a decorative layer is arranged on one side of the frame body, and the frame body is connected with the cover plate through bolts. The fireproof acoustic board is reasonable and reliable in structure, installation of various laminates is achieved through the frame body, it can be guaranteed that after the acoustic board is used for a long time, the laminates cannot fall off due to failure of the bonding strength, durability of the acoustic board is guaranteed, and meanwhile the fireproof acoustic board is not prone to falling off. The fireproof performance of the acoustic board can be improved through the arrangement of the fireproof coating, when a fire occurs, the coating can effectively prevent flame from spreading, the acoustic board is safer and more reliable when the fire occurs, and therefore the building structure and personnel safety are protected.

The invention provides an assembly type sound insulation floor slab and an assembly technology, and relates to the technical field of assembly type floor slabs, the assembly type sound insulation floor slab comprises a concrete solid main plate, the upper side and the lower side of the concrete solid main plate are each provided with a built-in plate layer, and a plurality of sound absorption matching openings penetrating through the bottom end face of the built-in plate layer are evenly distributed in the top end face of the built-in plate layer; one sound absorption matching piece is placed in each complete sound absorption matching opening, so that when sound waves enter, the sound waves can be reflected and scattered on the wall surfaces of the sound absorption matching openings and the surfaces of the sound absorption matching pieces for multiple times, the number of pores of the whole structure is increased, and the complexity of the whole structure is increased; the sound wave propagation path is more complex, the opportunity of interaction with materials is increased, more sound energy is consumed in the reflection and scattering process, the floor is further assisted to achieve the sound insulation function, and the problems that a traditional building floor lacks an effective sound absorption and silencing mechanism and cannot give full play to the acoustic characteristics of the materials are solved.

The utility model discloses an environment-friendly decorative heat-insulation fireproof composite board which comprises a positioning board, a connecting board is arranged on one side of the positioning board, an aerogel heat-insulation layer is arranged on the inner side of the connecting board, the aerogel heat-insulation layer and the connecting board are bonded through a bonding layer, an outer base board is arranged on the outer surface of the connecting board, and a heat-insulation layer is arranged on the outer base board. The outer surface of the positioning plate located on one side of the connecting plate is coated with an expansion type fireproof coating, a honeycomb plate is arranged on the other side of the positioning plate, a calcium silicate fireproof layer is arranged at the upper end of the inner side of the honeycomb plate, a polyester fiber layer is arranged at the lower end of the inner side of the honeycomb plate, and an inner base plate is arranged at one end of the honeycomb plate. Hydrophobic coatings are arranged on the outer surfaces of the inner base plate and the outer base plate, clamping plates are evenly arranged at the two ends of the connecting plate, and the clamping plates are connected with the positioning plates through connecting grooves. The heat insulation and fireproof effects of the composite board are improved.

The utility model relates to the technical field of silencers, and discloses a novel silencing material stainless steel silencer which comprises a silencer shell and a silencing assembly, and the silencing assembly is arranged in the silencer shell. The novel silencing material stainless steel silencer has excellent corrosion resistance and structural strength through the silencer shell made of the stainless steel material, it is ensured that the silencer can still work stably in a severe environment, meanwhile, the stainless steel material can also play a silencing role, and the silencing effect is good. The reinforcing blocks are connected with the widened position of the bottom of the silencer shell through the screws, the overall structural stability of the silencer is effectively enhanced, deformation or damage caused by vibration or external force is prevented, meanwhile, the composite plant fiber pipes have good sound absorption performance, noise transmitted into the silencer can be effectively absorbed and reduced, and the noise reduction effect is good. And in cooperation with the glass wool filled in the noise reduction reinforcing block, the noise reduction effect is further enhanced, and noise is attenuated on multiple levels.

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.

This utility model discloses a petal-shaped sound-absorbing lamp, relating to the field of architectural decoration technology. It includes a lamp body and a sound-absorbing component. The sound-absorbing component is mounted on the lamp body and comprises a mounting frame and sound-absorbing blades. The mounting frame has slots around its circumference, and the sound-absorbing blades are connected to the mounting frame via these slots. All sound-absorbing blades are angled clockwise. A power cord perforation is located in the center of the mounting frame. By using a petal-shaped sound-absorbing component and a wire rope perforation along the circumference of the power cord perforation on the mounting frame, the surface area of ​​the sound-absorbing component is increased several times compared to traditional one-piece sound-absorbing components, significantly improving the lamp's sound absorption effect. Furthermore, the sound-absorbing blades of the component are installed using a plug-in method, allowing for easy adjustment of the surface area of ​​the sound-absorbing panels according to actual needs, enabling adjustment of noise reduction strength to meet different usage requirements and scenarios.

The invention discloses a composite curtain wall with good flame-retardant and sound-insulating effects, which belongs to the technical field of composite curtain walls and sequentially comprises an aluminum plate outer layer, a sound-insulating layer, a flame-retardant outer layer, a sound-absorbing layer, a flame-retardant inner layer and an aluminum plate inner layer from outside to inside. The four-layer structure of the sound insulation layer, the flame-retardant outer layer, the sound absorption layer and the sound insulation inner layer is combined through the two principles of weakening sound waves through partition and consuming sound energy through a porous material, and efficient sound insulation is achieved. The flame-retardant outer layer and the flame-retardant inner layer are open-cell polyurethane foam plates added with flame-retardant additives, glass fibers, alginate fibers and hydroxyapatite nanorods, and the flame-retardant performance of the material is improved through the synergistic effect of the hydroxyapatite nanorods, the flame-retardant additives, the glass fibers and alginate fiber materials.

The invention provides an inlet silencing device of a turbocharger compressor, a compressor inlet is provided with a plurality of silencing cavities, a vibrating plate of a cantilever is arranged in at least one silencing cavity, at least one electrostatic driver is arranged on a vibrating path of the vibrating plate, local deformation is generated by controlling the electrostatic driver, and the compressor inlet silencing device is used for silencing the compressor inlet. The electrostatic actuator is caused to interfere with the vibration of the vibration plate. The electrostatic driver is arranged in the resonant cavity, the electrostatic driver makes contact with or is separated from the vibrating plate, so that the amplitude of the vibrating plate is changed, and the electrostatic driver and the vibrating plate can be selectively made to make contact with or be separated from each other according to the detected pressure change or noise of an outlet of the turbocharger; and the influence of synchronization impulse noise can be reduced or weakened.

The invention discloses a preparation method of a wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material, and relates to a preparation method of a damping composite material. The method comprises the following steps: 1, carrying out surface modification on metal hollow spheres; and 2, preparing the polymer. Compared with pure polyurethane, the prepared wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material has the advantages that the damping performance is greatly improved, the temperature range is widened, the excellent damping performance and acoustic performance are achieved, the preparation process is simple, the stability is high, and the composite material is suitable for large-area pouring and complex-shape base materials; wide application prospects are realized in the fields of ships, aerospace, vehicles, building materials and the like; after the surface-modified metal hollow spheres are compounded with polyurethane, the damping performance can be greatly improved, the temperature range is widened, the loss factor is increased from 0.45 to 0.85, and the effective temperature range is widened from 59.9 DEG C to 100 DEG C or above.

The present invention discloses a Roots blower with a guide device, comprising a casing, the casing is provided with an air inlet and an exhaust port, the air inlet is provided with an air inlet guide cone, an air inlet flow channel is formed between the air inlet guide cone and the inner wall of the air inlet, the exhaust port is provided with an air outlet guide cone, an air outlet flow channel is formed between the air outlet guide cone and the inner wall of the exhaust port, an exhaust cavity with openings at both ends is provided inside the air outlet guide cone, an exhaust hole connected to the exhaust cavity is provided on the casing, the air inlet guide cone and the exhaust guide cone have concave arc surfaces on the side facing the impeller, and a limit protection valve is provided on the side facing the impeller of the air outlet guide cone. By providing the guide cone, a longer flow channel can effectively delay the reflux process of high-pressure gas, and even if the gas enters the volume formed by the impeller and the casing along the flow channels on both sides of the two guide cones, the generation of gas turbulence can be effectively avoided, thereby solving the problem of high noise of the current blower.

The utility model discloses an enhanced inner wall surface sound absorption structure which comprises a concrete wall body, a cement mortar leveling layer, a first sound absorption layer, a first light steel keel layer, a double-layer gypsum board, a second sound absorption layer and a second light steel keel layer which are sequentially arranged. The projection of the first light steel keel layer and the projection of the second light steel keel layer on the projection plane parallel to the concrete wall body are configured to be not overlapped, and the first light steel keel layer and the second light steel keel layer are fixed to the concrete wall body through a first keel anchor bolt and a second keel anchor bolt correspondingly. The first light steel keel layer and the second light steel keel layer comprise a plurality of transverse keels and vertical keels which are orthogonally connected, and the distance between the transverse keels and the distance between the vertical keels located on the same light steel keel layer are 600 mm. The sound absorption device is simple in structure, convenient to install and capable of achieving a good sound absorption effect.

The application discloses a staggered and stacked wave-shaped sound barrier with a multilayer composite sound absorption structure and relates to the technical field of sound absorption equipment. The technical scheme is as follows: the sound barrier comprises an I-shaped stand column and a multilayer sound absorption assembly, the multilayer sound absorption assembly is arranged on one side of the I-shaped stand column, the multilayer sound absorption assembly is used for absorbing noise, the multilayer sound absorption assembly comprises a bottom plate, a side plate, an outer sound absorption plate and an inner sound absorption plate, recesses one and two are formed in the top surface of the bottom plate, recesses three and four are formed in the inner side of the side plate, the multilayer sound absorption assembly and the clamping and replacing assembly are used, the multilayer staggered sound absorption structure and the air layer can be used for more sufficient sound absorption, the inner sound absorption plate can be prevented from being blocked, and noise can be fully absorbed and reduced from multiple angles.