40results about How to "Improve sound insulation performance" patented technology

According to the thin-layer sound absorption superstructure composite acoustic enclosure and the using method, the acoustic enclosure is composed of the cover plate, the conformal frame, the thin-layer sound absorption superstructures and the porous sound absorption materials, the variety of the thin-layer sound absorption superstructures is not limited to one, and the broadband noise reduction effect can be achieved through the parallel superposition design of the thin-layer sound absorption superstructures and the porous sound absorption materials. Wherein the thin-layer sound absorption superstructure can absorb noise in different frequency ranges of medium and low frequency bands, the porous sound absorption material can absorb noise in medium and high frequency bands, and the working bandwidth of the composite acoustic shield after parallel connection and superposition can cover the low, medium and high wide frequency bands. The thin-layer sound absorption superstructure composite acoustic shield further has the advantages of being high in space utilization rate, high in space adaptability, small in thickness, low in surface density and high in material replaceability. Compared with an existing sound insulation cover, on the premise that the thickness is small and the surface density is low, the working frequency band is wider, the sound insulation effect is better, and the sound insulation cover has wide application prospects in noise control of various mechanical and electrical products.

The invention discloses an assembled self-insulating recycled concrete block wall and a construction method thereof, wherein the wall comprises a beam-column system, a structural layer and a decorative layer; the decorative layer is fitted with one side of the structural layer; the beam-column system comprises an upper side beam, a lower side beam, a left column and a right column; the structural layer is a multi-layer masonry, and the multi-layer masonry comprises several layers of walls built by main blocks, a layer of walls built by secondary blocks, and end blocks; a left column and a right column are respectively arranged at both ends of the lower side beam; the structural layer is built on the lower side beam and is located between the left column and the right column; an upper side beam is arranged at the top of the structural layer; a first notch and a first convexity are respectively arranged on the outer sides of the left column and the right column; a second convexity is arranged at the top of the upper side beam, and a second notch is arranged at the bottom of the lower side beam. By arranging a special connector to connect the structural layer and the decorative layer, the assembly is convenient and the splicing efficiency can be greatly improved.

The compressor shell comprises a machine shell and a sleeve, the machine shell is of a barrel-shaped structure with one end open or two ends open, the sleeve is of a barrel-shaped structure with two ends open, an installation portion used for installing a motor stator is arranged in the machine shell, the sleeve is arranged on the peripheral wall of the machine shell in a sleeved mode, and the machine shell is of a barrel-shaped structure with one end open or two ends open. And the radial projection of the sleeve covers the mounting part. According to the compressor shell, under the condition that the thickness of a machine shell is not increased, the overall thickness can be increased through the sleeve, the overall thickness of a compressor on the outer side of the installation part is indirectly increased, and therefore the sound insulation capacity of the compressor is improved, the effect of reducing noise is achieved, and meanwhile the installation difficulty of the machine shell and a motor stator can be reduced.

The utility model discloses a passivation device for mechanical manufacturing, and relates to the field of passivation devices for mechanical parts. The sand box passivating device comprises a protecting mechanism, a passivating mechanism is arranged on the lower portion in the protecting mechanism, the passivating mechanism comprises a fixing frame, four universal wheels are arranged at the bottom of the fixing frame, and a sand box is installed on the top of the fixing frame through a plurality of spring sleeve rods. Wherein the fixing frame is combined with the universal wheels, stable supporting is provided, moving and positioning are convenient, the flexibility and convenience of the device are enhanced, the spring sleeve rod utilizes the elasticity and the buffering capacity of the spring sleeve rod, impact generated when the sand box vibrates is reduced, uniform and stable vibration of the sand box is kept, grinding materials are evenly distributed in the vibration process through the circular structure of the sand box and the arrangement of the passivation tank, and the grinding efficiency is improved. And the vibration motor effectively activates and distributes grinding materials through controllable vibration, the grinding materials make contact with the surfaces of the parts in an all-dimensional mode, and the passivation effect and uniformity are ensured.

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 present invention belongs to the field of building construction technology, and in particular, relates to an integrated assembled composite floor with thermal insulation and sound insulation structure, including a floor body, the upper end of which is fixedly connected with a plurality of connectors distributed in a rectangular array, a hollow layer having a thermal insulation effect is provided inside the floor body, and ventilation steel pipes connected to the outside are embedded in the inner walls of both sides of the hollow layer; and an adjustment component is used to adjust the thermal insulation effect of the hollow layer according to the outside temperature. The present invention can adjust the ventilation rate of the ventilation steel pipe according to temperature changes by setting an adjustment component, thereby adjusting the thermal insulation effect by changing the air convection speed; by setting an adaptive sound insulation component, the electric field strength around the deformable sound absorbing member can be adjusted according to the sound pressure of the outside world, and the sound insulation effect can be adjusted by changing the deformation degree of the deformable sound absorbing member.

The utility model discloses an aluminum-plastic co-extrusion building system door and window which is composed of an outer frame, a mullion and a glass sash. Glass is arranged between the upper transverse frame and the middle transverse frame and between the lower transverse frame and the middle transverse frame; the upper transverse frame, the middle transverse frame and the lower transverse frame are each composed of an outer profile assembly and an inner profile assembly. The outer profile assembly comprises an outer plate and an outer profile; the outer plate is connected with the outer profile through a first heat preservation and insulation structure. The outer plate and the outer profile are connected through the first heat insulation structure, the outer profile and the inner profile body are connected through the second heat insulation structure, multiple heat resistance barriers are formed, the first heat preservation layers co-extruded on the two sides are matched, a heat conduction path is effectively blocked, and the door and window profile has good heat preservation and heat insulation performance; in addition, heat insulation type aluminum-plastic co-extrusion systematic doors and windows with different K values or U values are constructed by combining the outer sectional material, the sealing structure and different inner sectional material bodies.

This utility model discloses a prefabricated soundproof ceiling system, including several hangers connected to the building floor slab. The lower ends of the hangers are connected to main keel hangers via adjusting components. The lower ends of the main keel hangers are inserted into the main keel. The main keel is connected to secondary keels via several secondary keel hangers. The lower ends of the secondary keels are connected to several soundproof ceiling panels. Each secondary keel hanger includes a hook-shaped connecting part I connected to the main keel and a sheet-shaped connecting part II connected to the secondary keel. The upper end of the secondary keel is provided with a connecting groove adapted to the connecting part II. This application solves the problems of low installation efficiency and poor sound insulation effect in existing soundproof ceiling systems, improves construction quality, enhances construction efficiency, and improves the sound insulation performance of the ceiling.

The active noise reduction fireproof sound insulation door comprises a door frame, a door body and a wall body, the door frame is of a square structure, the surface of the door frame is a special fireproof steel plate, the outer surface of the special fireproof steel plate is coated with an anti-corrosion coating and a fireproof coating in a spraying mode, and the periphery of the door frame extends outwards; the door body is of a multi-layer composite structure, and the door body is structurally composed of an anti-corrosion coating, a fireproof coating, a special fireproof steel plate, an inner frame reinforcing plate, a sound insulation plate, fireproof core material rock wool, a sound insulation plate, a special fireproof steel plate, a fireproof coating and an anti-corrosion coating from outside to inside. The door body is installed in the square-shaped structure, the door body of the multi-layer composite design can effectively improve the sound insulation performance of the ship door, reduce the harm of noise to human bodies, effectively prevent the harm of smoke and poisonous gas to the human bodies when a fire happens, and guarantee the personal safety.

The invention discloses a cabin wall plate with a connecting groove, and relates to the technical field of cabin wall plates, the cabin wall plate comprises a panel I, a panel II, fireproof rock wool, reinforcing ribs and a connecting plate, one end part of the panel is provided with a 90-degree folding edge, the end part of the panel II is provided with an 80-degree folding edge, and a clamping part comprises a clamping block. A clamping groove for the clamping block to stretch in is formed in the surface of the brim edge, the abutting part is arranged in the first groove, the limiting part comprises a force storage assembly connected with the abutting part, an octagonal folding edge is arranged at the end of the second panel, a U-shaped inserting groove is formed by the folding edge and the folding edge of the first panel, a wall plate can be conveniently inserted and installed, and the wall plate is more compact. Through movement of the clamping part, the clamping block extends into the clamping groove to achieve primary clamping, and through movement of the limiting part, the limiting plate is limited, so that secondary clamping is achieved, the connection firmness of the bulkhead plate is guaranteed, bolts do not need to be used for punching, and the effects of the attractiveness, comfort and connection efficiency of a ship cabin are effectively improved.

The application provides a nail-free interior sound insulation wall and a mounting method thereof, and belongs to the technical field of interior sound insulation walls.The nail-free interior sound insulation wall comprises a pre-assembled part, a top keel frame, a bottom support frame, a middle wall body support frame and a sound insulation assembly.The pre-assembled part is pre-assembled at the top position of the space where the interior sound insulation wall is located, and the long axis direction of the pre-assembled part is the same as the mounting direction of the interior sound insulation wall.The top keel frame is fixedly connected with the pre-assembled part, the bottom support frame is arranged at the corresponding bottom position of the top keel frame, the middle wall body support frame is fixedly arranged between the top keel frame and the bottom support frame, and the middle wall body support frame, the top keel frame and the bottom support frame jointly form the frame structure of the interior sound insulation wall.The nail-free interior sound insulation wall and the mounting method thereof can solve the problems of the existing nail-free interior sound insulation wall, such as complex mounting structure, low adjustability and the ability to only adapt to walls with the same structure.

The invention belongs to the technical field of building construction, and particularly relates to a heat preservation and sound insulation structure integrated assembly type composite floor slab which comprises a floor slab body, the upper end of the floor slab body is fixedly connected with a plurality of rectangular connecting pieces distributed in an array mode, and a hollow layer playing a heat preservation and insulation effect is arranged in the floor slab body. Ventilation steel pipes communicating with the outside are embedded in the inner walls of the two sides of the hollow layer. The adjusting assembly is used for adjusting the heat preservation and insulation effect of the hollow layer according to the external temperature. By arranging the adjusting assembly, the ventilation rate of the ventilation steel pipe can be adjusted according to the temperature change, and therefore the heat preservation effect is adjusted according to the change of the air convection speed; by arranging the self-adaptive sound insulation assembly, the electric field intensity on the peripheral side of the deformation sound absorption part can be adjusted according to the external sound pressure condition, and the sound insulation effect is adjusted by changing the deformation degree of the deformation sound absorption part.

The invention relates to the technical field of wall structure design, in particular to a building energy-saving fireproof sound-insulation decorative wall design structure which comprises a sliding base, a hollow layer and a wall back plate are mounted at the top end of the sliding base, and the hollow layer and the wall back plate are close to the edges of the two ends of the sliding base respectively. By means of the metal hole plate, the sound absorption cotton, the steel keel frames, the rock wool interlayer on the steel keel frames, the air layer between the two sets of steel keel frames, the damping rubber pad, the expanded perlite plate and other multi-layer structures, multiple isolation and absorption of noise can be formed, and therefore the sound insulation performance of the wall is effectively improved; by means of the liquid air bags filled with hydrogel and the inclined hollow grooves formed in the sound absorption cotton, the sound insulation performance of the wall body can be further improved, the fireproof performance of the wall body can be effectively guaranteed when a fire disaster happens, and when the fire disaster intensity is large, the expansion type fireproof coating is arranged, so that the fireproof performance of the wall body is improved. And the fireproof performance of the wall body is further ensured.

The invention relates to the technical field of coatings, and discloses a high-performance sound insulation coating and a preparation method thereof.The sound insulation coating is formed by mixing epoxy resin serving as a base material and functional additives and other auxiliary materials, the polymer aerogel on the surface of the argil can form a transition connection layer between the argil and an epoxy resin matrix, and the polymer aerogel is formed by freeze-drying cross-linked maltose, so that residual hydroxyl groups, which do not participate in reaction, in the structure of the polymer aerogel can participate in the curing process of the epoxy resin coating; according to the present invention, the argil can be uniformly dispersed in the epoxy resin matrix so as to produce the anchoring effect, such that the sound absorption effect of the porous structure can be performed, the advantage of the argil as the inorganic substance can be adopted to improve the strength of the coating material, and the aerogel type structure can reduce the reflection and the propagation of the sound wave, and can absorb the sound wave; therefore, the sound insulation effect of the coating is effectively improved.

The utility model provides a multi-layer sandwich structure light-weight high sound insulation board which comprises a first sandwich structure, a second sandwich structure, a third sandwich structure and a fourth sandwich structure, the first sandwich structure comprises a first sandwich structure face plate, a first sandwich structure back plate and a first sandwich structure core material, and the first sandwich structure core material is located between the first sandwich structure face plate and the first sandwich structure back plate; the second sandwich structure back plate is connected with the first sandwich structure back plate through reinforcing ribs to form a second sandwich structure; a reinforcing rib gap between the first sandwich structure back plate and the second sandwich structure back plate is filled with the sound absorption and heat insulation layer; and the acoustic super-structure layer is embedded in the sound absorption and heat insulation layer and is composed of periodic local resonance units. According to the light high-sound-insulation board with the multi-layer sandwich structure, the sound insulation performance is improved, meanwhile, the weight of the whole structure is reduced, light weight is achieved, and the light high-sound-insulation board has the excellent comprehensive performance of good rigidity, heat insulation, heat preservation and the like.

This invention discloses a sound insulation panel and its multi-tiered Helmholtz acoustic metamaterial resonant structure and design method, achieving broadband sound insulation, enriching the product's application scenarios, and optimizing the structural design to achieve easier processing and reduced costs. The multi-tiered Helmholtz acoustic metamaterial resonant structure includes at least two stages of thin-film-Helmholtz resonant structures arranged sequentially along the sound wave incident direction, and a homogeneous plate for fixing the last stage of the thin-film-Helmholtz resonant structure. Each stage of the thin-film-Helmholtz resonant structure includes a thin film and a plate arranged sequentially along the sound wave incident direction, with the opposite surfaces of the thin film and the plate sealed together. A first through-hole and a second through-hole are coaxially arranged sequentially along the sound wave incident direction on the plate. The second through-hole communicates with the first through-hole to form the resonant cavity of the thin-film-Helmholtz resonant structure, and the size of the second through-hole is larger than that of the first through-hole. The first and second through-holes of each stage of the thin-film-Helmholtz resonant structure have a stepped shape with gradually increasing opening size in the sound wave incident direction.

The invention relates to the technical field of polyurethane styrofoam, and particularly discloses a sound insulation polyurethane styrofoam for floors and a preparation method thereof.The styrofoam A component comprises a PCL-PTMG-MDI block copolymer, silane modified beta-polyvinylidene fluoride, bis-hydroxyethyl disulfide, zinc acetylacetonate, carboxylated multi-walled carbon nanotubes and acetylene black; the polystyrene foam component B is prepared from PTMEG polyether polyol, polyethylene glycol adipate polyol, flame-retardant polyether polyol, epoxy resin coated fly ash floating beads, silane modified basalt fibers, hydroxyethylated PVB fibers, tetrahydroxypropyl ethylenediamine, a microcapsule foaming agent, a foam stabilizer, a fumed silica thixotropic agent and an organic bismuth catalyst, and during use, the component A and the component B are mixed to form the flame-retardant polyurethane foam. The sound insulation polyurethane foaming glue for the floor is obtained.

The invention discloses a manufacturing method of a thin-film acoustic metamaterial composite sound insulation board, relates to the technical field of noise control, and aims to solve the problems that an existing thin-film acoustic metamaterial sound insulation board is narrow in sound insulation frequency band, core components are prone to damage, the structure is unstable, the machining precision is low, and the process adaptability is poor. The sound insulation plate comprises a porous sound absorption plate, a micro-perforated plate, a reinforcing grating and a protective layer, the reinforcing grating is of a frame type structure, the porous sound absorption plate is mounted in the reinforcing grating in a filling manner, the porosity of the porous sound absorption plate is linearly decreased from outside to inside, and the micro-perforated plate and the protective layer are sequentially mounted on the outer surface of the reinforcing grating filled with the porous sound absorption plate; the base plate comprises protective layers, clamping plates and a resonance film set, the resonance film set is composed of 2-3 layers of sound insulation films, an elastic damping layer is arranged between every two adjacent sound insulation films, the resonance film set is arranged between the two clamping plates, and the protective layers are arranged on the outer walls of the two clamping plates; the base layer plate is arranged between the two layers of sound insulation plates which are symmetrical in structure, and the reinforcing grating filled with the multi-hole sound absorption plates is connected with the protective layer of the base layer plate. 20-1600Hz broadband efficient sound insulation is realized, the structure is stable and durable, the product consistency is good, the weight is light, and the construction is easy.

The invention discloses an anti-diffraction device and a sound barrier, and relates to the technical field of sound insulation, and the anti-diffraction device comprises a shell and a sound absorption unit. The shell comprises a first side plate, a second side plate and a top plate, wherein the first side plate and the second side plate are oppositely arranged, the top plate is connected to the top of the first side plate and the top of the second side plate, and the first side plate and the second side plate are each provided with one or more through holes. The sound absorption unit is arranged in a cavity formed among the first side plate, the second side plate and the top plate; the sound absorption unit is made of a sound absorption material, a cavity is formed in the top of the sound absorption unit, the width of the cavity is reduced towards the side away from the top plate, and the overall structure of the sound absorption unit has good sound absorption performance and can reduce low-frequency noise diffraction, has a gradually-changed structure and can reduce high-frequency noise diffraction. And the sound insulation board has a good broadband characteristic, so that the sound insulation effect is improved in a wider frequency band.

The present 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 includes a bottom putty, a middle putty and a surface putty that cover each other in sequence, and the bottom putty is directly covered on the wall surface; wherein the bottom putty includes white cement, heavy calcium powder, silica ash, rubber powder, barite powder, iron powder, latex powder, fiber and cellulose ether, the middle putty includes white cement, heavy calcium powder, silica ash, floating beads, rubber powder, fiber, latex powder, aerogel and cellulose ether, and the surface putty includes white cement, light calcium powder, silica ash, floating beads, fiber, latex powder, aerogel and cellulose ether. The sound insulation putty layer of the present invention can absorb sounds in different frequency ranges, significantly improve the sound insulation performance in various frequency ranges, and improve the comfort and quality of living and working environments.

The utility model belongs to the field of archaized window production, and relates to an archaized supporting and picking window which comprises a sill frame, a supporting sash, a picking sash and a gauze sash, the sill frame comprises a replacement pile located at the top, a pedal located at the bottom and embracing frames located on the left side and the right side, and the picking sash is a detachable picking sash movably installed on the lower portion in the sill frame. The branch sash is an externally-supported branch sash movably installed on the upper portion in the sill frame, the inner side of the branch sash is an internally-supported screen sash, rabbets are formed in the peripheries of the picking sash, the branch sash and the screen sash, adhesive tape grooves are formed in the rabbets, and sealing adhesive tapes are installed in the adhesive tape grooves; glass is embedded in the supporting sash, a partition core is installed on the outer side of the glass, and the glass is hollow glass. Due to the facts that the rabbets are formed, the rubber strip grooves are formed in the rabbets, and the sealing rubber strips are installed in the rubber strip grooves, the problems that ventilation and transparency exist between the sill frame and the partition boards and between the partition boards are not tight in sealing are solved; the heat preservation and sound insulation performance is greatly improved by adopting the hollow glass; and the design of the gauze fan increases comfort and aesthetic feeling for home life.

The invention discloses a polyethylene fiber reinforced concrete material for a light sound barrier plate and a preparation method of the polyethylene fiber reinforced concrete material, and relates to the field of fabricated buildings. The method comprises the following steps: firstly, preparing swelling grafted rubber particles and modified polyethylene fibers, and melting and coating to obtain polyethylene fiber coated rubber particles; stirring the raw materials such as Portland cement, slag powder and the like at a gradient rotating speed to prepare a concrete base material, adding the polyethylene fiber coated rubber particles into the base material in batches, and performing stirring and vacuum defoaming to obtain the concrete material. The problems that traditional sound barrier plate concrete is large in dead weight and poor in tensile, anti-cracking and sound insulation effects, the interface bonding force between waste tire rubber particles and a concrete matrix is weak, and polyethylene fibers are prone to agglomeration are solved, the prepared concrete material has the light weight and the excellent mechanical property and sound insulation effect, and resource utilization of waste tires is achieved.

The invention relates to the technical field of noise reduction of air compressors, in particular to an integrated sound insulation cover which comprises an air compressor. The shell is a cavity; an adjusting frame is arranged in the cavity in a sliding mode, and when the adjusting frame slides in the cavity, the position, entering the air compressor from the cavity, of the cold air is controlled to be changed; the ventilation control function is integrated into the sound insulation cover, the position of the air hole is moved by adjusting the position of the adjusting frame, precise cooling is achieved, the needed air volume is reduced, the situation that the sound insulation effect is weakened due to the too large air volume is avoided, the multiple air suction ports circularly suck air, the air flowability is enhanced, and the overall cooling effect is improved; vibration is subjected to multiple reflection through all the cavities and then eliminated, the contact area is increased, meanwhile, the air speed is reduced, air speed noise is avoided, real-time monitoring is conducted through temperature parameters of a temperature sensor, the ventilation position is automatically adjusted, the air inlet and outlet flow is controlled according to the noise reduction and sound insulation requirements, and the sound insulation requirement of the air compressor is met.

The utility model relates to noise control technical field discloses a sound insulation door, the sound insulation door includes the door frame (1) of no threshold and the door leaf (3) of opposite opening through the hinge (2) installation to the door frame (1) on, the contact surface of door frame (1) with door leaf (3) and the contact surface of two door leaf (3) are all formed with the ladder structure for installing multiple sealing members, and the bottom of door leaf (3) is equipped with the sealable seal strip (6). The sound insulation door is smooth, and the sealing performance is good, and the service life is long.

The present application discloses a cement-based sound-absorbing board and its preparation method and application. In the first aspect of the present application, a cement-based sound-absorbing board is provided. The raw materials for preparing the cement-based sound-absorbing board include: inorganic hydraulic cementitious material, modified porous lightweight aggregate, foaming agent, foam stabilizer, water reducer, second waterproof agent and water. The modified porous lightweight aggregate is a natural porous lightweight aggregate obtained by surface modification treatment with a first waterproof agent. Compared with the existing sound-absorbing materials, a larger amount of natural porous lightweight aggregate is introduced into the sound-absorbing board of the present application, which plays a role in supporting the cavity structure and providing an effective path for sound wave propagation. While greatly improving the sound insulation performance of the sound-absorbing board, the collapse problem caused by the introduction of high-component lightweight aggregate into the system is avoided.

The embodiment of the application discloses a kind of acoustic logging sound insulation methods based on phononic crystal.The method comprises: according to the instrument wave main frequency range of the instrument to be sound insulated, the band gap constraint condition of sound insulation body is set;Determine the material attribute and scattering body filling rate value range of sound insulation body, according to the reference size parameter and band gap constraint condition of the instrument to be sound insulated, the lattice constant value range of sound insulation body is determined;According to the lattice constant value range and scattering body filling rate value range, construct two-dimensional parameter space grid matrix;According to material attribute, establish finite element energy band solver;Characteristic solution is carried out using finite element energy band solver, and the band gap characteristics of each matrix element is obtained;According to reference size parameter and the matrix element that satisfies preset band gap screening condition and the band gap bandwidth of the largest band gap characteristics, sound insulation body is designed;Sound wave logging sound insulation processing is carried out to the instrument to be sound insulated using the sound insulation body after design, high-efficiency sound insulation is realized, and the data quality of sound wave logging is improved.

The utility model discloses a composite shock absorption sound insulation board structure of ship relates to sound insulation board technical field. The utility model discloses a glass fiber reinforced polymer backboard is provided with foamed aluminum board in the top, and the top of foamed aluminum board is provided with the metal panel, the top of glass fiber reinforced polymer backboard is provided with the dismounting mechanism, and the dismounting mechanism includes the first threaded hole of being set up in the top of foamed aluminum board, and the second threaded hole of being set up in the top of metal panel. The utility model discloses a dismounting mechanism and threaded hole cooperation are set up, realized the quick dismounting and replacement of metal panel, avoided the corrosion risk of integral type board material, significantly improved maintenance efficiency and reduced the replacement cost, through positioning mechanism and the card slot structure, realized the accurate alignment and installation between multiple sound insulation boards, reduced the dependence on manual auxiliary positioning, improved installation accuracy and construction efficiency.

The utility model discloses a multi-band directional sound insulation front wall pad, relates to the technical field of automobile appliances, and comprises an outer noise reduction layer, a broadband sound insulation layer, a sound absorption resonance layer and an adhesive layer, the adhesive layer is fixedly connected to the top surface of the outer noise reduction layer, the broadband sound insulation layer is fixedly connected to the bottom surface of the outer noise reduction layer, and the sound absorption resonance layer is fixedly connected to the bottom surface of the broadband sound insulation layer. The outer noise reduction layer is used as the first layer in contact with an engine compartment, the high elasticity and flexibility of the outer noise reduction layer can absorb idling vibration of an engine, solid sound transmission is reduced, the noise reduction effect is good, the noise reduction effect is good, and the noise reduction effect is good. The matched critical frequency of the aluminum plate is damaged through the corrugated surface of the double-layer corrugated aluminum alloy plate, medium-high frequency band sound insulation troughs are avoided, gaps between the aluminum plates are prevented from being filled with damping glue, vibration of the aluminum plates is restrained, secondary noise radiation generated by vibration is reduced, and the overall sound insulation performance is improved.

The utility model belongs to the technical field of building structures, and particularly relates to a U-groove inward-opening window structure which comprises a U-groove inward-opening window structure body, an indoor side aluminum profile assembly is arranged in the U-groove inward-opening window structure body, a heat insulation strip assembly is installed on the side of the indoor side aluminum profile assembly, and a U-groove inward-opening window is formed in the U-groove inward-opening window structure body. An outdoor side aluminum profile assembly is arranged on the other side of the heat insulation strip assembly, and a frame profile is installed on the side of the outdoor side aluminum profile assembly. The indoor side aluminum profile assembly comprises an inner side aluminum profile body, an inner side first cavity is formed in the inner side aluminum profile body, an inner side second cavity is formed in the side of the inner side first cavity, an inner side third cavity is formed in the other side of the inner side first cavity, and a first U-shaped groove opening is formed in the side of the inner side third cavity; torque force and inertia moment of the profile can be enhanced conveniently, sound insulation performance can be improved conveniently, and sealing performance can be improved conveniently.