44results about How to "Effective sound absorption" patented technology

The invention relates to the sound absorption technical field, particularly to a composite sound absorption structure. A sound absorption plate of the composite sound absorption structure comprises a micro perforation plate and a plate base body; the micro perforation plate is provided with a plurality of through sound absorption holes; the plate base body is provided with a plurality of sound absorption empty chambers; a communication channel is formed between every two adjacent sound absorption empty chambers; the surface of the plate base body, which is provided with the sound absorption empty chambers, is attached to the micro perforation plate; every sound absorption hole formed in the micro perforation plate is communicated with the corresponding sound absorption empty chamber formed in the plate base body; an empty chamber is formed between a structural base body of the composite sound absorption structure and the plate base body of the sound absorption plate. Compared with the prior art, the micro perforation plate, the sound absorption empty chambers and the communication channel formed between every two adjacent sound absorption empty chambers can effectively participate in energy consumption and sound absorption, meanwhile the resonance effect is achieved through the empty chamber formed between the composite sound absorption plate and the structural base body, and accordingly the sound absorption effect of the composite sound absorption structure can be particularly significant and meanwhile the sound absorption structure can be separately and independently machined, the manufacturability is good, and the production cost can be controlled.

The invention discloses a full-range sound absorption member as well as a relevant fabrication method. In the full-range sound absorption member, a surface punched sound absorption plate comprises a metal sheet; a micropunched sound absorption film is composed of a macromolecule non-metal material; the micropunched sound absorption film can fulfill crossed winding along folding lines on both sides to support racks to supports the surface punched sound absorption plate and the protection panel, and moreover, form a triangular resonance cavity; meanwhile, the micropunched sound absorption film can realize crossed connection along folding lines to support the surface punched sound absorption plate and the protection panel on both sides, in order to form a triangular resonance cavity. The invention adopts a numerically-controlled device to perform fabrication, utilizes a combination of a double-layer micropunched sound absorption film (sheet) resonance sound absorption structure with the surface punched sound absorption plate resonance sound absorption structure; meanwhile, the depth of the background resonance cavities are all continuously transitted, so that the full-range sound absorption member can guarantee that noise adsorption performances in all freqhence ranges can reach perfect effects. Therefore, the invention adapts to places with higher purification requirements and needing denoise measures.

The invention discloses a porous material-pored corrugated compound light multifunctional sandwich panel and a preparation method. The method comprises the following steps: successively welding a pored metal sheet, a pored corrugated sandwich structure and an unperforated metal sheet; filling an opening porous material into a space formed between the pored corrugated sandwich structure and the unperforated metal sheet; compounding the opening porous material and a pored corrugated sandwich panel. Compared with the single narrow band sound absorption or sound insulation property of the other traditional acoustic structure, the structure disclosed by the invention is capable of simultaneously realizing the sound absorption and sound insulation properties in low frequency and wide frequency. Due to the excellent mechanical properties, such as, specific stiffness, strength and shock resistance, of the sandwich panel, the structure disclosed by the invention is an ultra-light multifunctional structure with excellent acoustical and mechanical properties and has significant application prospect in the engineering field.

The invention relates to the sound absorption technical field, particularly to a composite sound absorption plate. The composite sound absorption plate comprises a micro perforation plate and a base body which are arranged in an attached mode; the micro perforation plate is provided with a plurality of through sound absorption holes; the base body is provided with a plurality of sound absorption empty chambers; a communication channel is formed between every two adjacent sound absorption empty chambers; the surface of the base body, which is provided with the sound absorption empty chambers, is attached to the micro perforation plate; every sound absorption hole formed in the micro perforation plate is communicated with the corresponding sound absorption empty chamber formed in the base body. Compared with the prior art, the micro perforation plate, the sound absorption empty chambers and the communication channel formed between every two adjacent sound absorption empty chambers can effectively participate in energy consumption and sound absorption, the energy consumption effect is achieved through the resonance sound absorption principle of the micro perforation plate and the sound absorption empty chambers, and accordingly the sound absorption effect of the structure can be particularly significant and meanwhile the sound absorption structure is located on the base body and the micro perforation plate and accordingly the separated independent machining can be performed, the manufacturability is good, and the production cost can be controlled.

The invention relates to a passive sound absorber (3, 4, 6, 7, 8) comprising a closed cavity (30, 80) opening to the outside via an inlet direction (D3) via a collar passing through the front wall inorder to form a Helmholtz resonator for a first frequency. According to the invention, said absorber further comprises at least one moving element, or membrane (32, 42, 62, 72a, 72b), suspended or held by suspensions (33, 43, 6140) in a position obstructing said collar in a non-sealed manner. The relative stiffness of the suspensions and of the membrane is determined such that the assembly resonates in a vibration following a "piston" movement at a second frequency different from the first frequency, producing an absorption for said second frequency or range of frequencies. A hybrid version comprises a coil (324) that is controlled to adjust the acoustic impedance of the absorber. The invention proposes an acoustic wall comprising a plurality of such absorbers produced by a repetitive structure opening through perforations, each receiving such a membrane, as well as a method for designing and producing such an absorber or wall.

The invention relates to a sound absorption device and a wheel with the sound absorption device. The sound absorption device (10) is constructed into a box body in a rectangular hexahedron shape, anda porous double-layer Helmholtz resonance sound absorption structure is formed; meanwhile, the sound absorption device (10) in a box body form forms a structure resonance sound absorption device by the self; and the first-order inherent mode frequency is identical to the first-order inherent mode frequency of a wheel air chamber (30). When the box type sound absorption structure provided by the invention is assembled in the wheel, the function of duplex absorption of wheel air chamber sound resonance by organically combining the Helmholtz resonance sound absorption and the structure resonancesound absorption can be realized.

The invention relates to a silencer applied to the field of silencing and noise reduction for internal combustion engines, in particular to a complex silencer for a diesel generator unit. The complex silencer for a diesel generator unit comprises an intake tube, a dissipative silencing structure connected with the intake tube in series, a resistant silencing structure arranged inside the dissipative silencing structure, and a gas outlet tube connected with the dissipative silencing structure in series, wherein three expansion chambers are formed by a resonance perforated plate, a first-level resistant baffle and a second-level resistant baffle together, and are arranged in the direction from the intake tube to the gas outlet tube in the order of the first expansion chamber, the second expansion chamber and the third expansion chamber. Because the dissipative silencing structure and the resistant silencing structure are connected in series for use, the range of the silencing frequency band is broader; and making use of different expansion ratios, the passing frequency of exhaust flow is increased, the peak value of silencing of the silencer can be large, and the silencing capacity can be increased. The complex silencer for a diesel generator unit has the advantages of being broad in silencing frequency band, small in volume, simple in structure, low in transmission loss and light in integral weight. Meanwhile, the effect of improving the anticorrosion function is achieved by using metal tubes and metal plates.

The invention discloses a gradient slitting double-porosity sound absorbing device and application thereof. The gradient slitting double-porosity sound absorbing device comprises a seamed porous material plate and rigid backing; the seamed porous material plate is arranged on the rigid backing, a plurality of gradient slits are formed in the seamed porous material plate periodically at intervals,and the slitting direction of the gradient slits is perpendicular to the seamed porous material plate. The gradient slitting double-porosity sound absorbing device is simple and practical in structure, has a superior sound absorbing property and a flexible sound absorbing adjusting function in a low frequency band, a medium frequency band and a high frequency band, and has good and wide application prospects.

The invention discloses a sound insulating pad for an automotive carpet. The sound insulating pad comprises a first sound insulating felt, a first foamed polypropylene layer, a sound-absorbing panel, a second foamed polypropylene layer, sound-absorbing sponge and a second sound insulating felt, wherein the first foamed polypropylene layer and the second foamed polypropylene layer are connected to the upper surface and the lower surface of the sound-absorbing panel by a high-temperature laminating mode; the first sound insulating felt is attached to the upper surface of the first foamed polypropylene layer; the second sound insulating felt is arranged below the second foamed polypropylene layer; and the sound-absorbing sponge is arranged between the second foamed polypropylene layer and the second sound insulating felt. By adoption of the mode, the sound insulating pad for the automotive carpet, disclosed by the invention, can be used for effectively absorbing sound and effectively adsorbing outside noises, and has excellent sound absorbing and heat insulating effects; and when the sound insulating pad is impacted, a good buffer effect can be realized, and a quiet automobile indoor environment can be created.

The variable cross-section perforated double-layer sandwich broadband sound-absorbing panel relates to a sound-absorbing panel. In order to solve the problem that the existing wooden sound-absorbing panels have a narrow sound-absorbing frequency band. The panel, the upper core layer, the thin paper layer, the lower core layer and the back panel are bonded together from top to bottom in sequence. There are multiple through holes uniformly distributed along the thickness direction on the panel, and each through hole consists of a small diameter round hole. Composed of large-diameter round holes or conical holes, small-diameter round holes are set on the front of the panel, large-diameter round holes or conical holes are set on the back of the panel, and the diameter of the small-diameter round hole is equal to the diameter of the small end of the conical hole. The upper and lower core layers are both honeycomb core layers. The honeycomb core layer is composed of multiple hexagonal cylinders spliced ​​together. The inner cavity of each hexagonal cylinder is a honeycomb cavity. The multiple honeycomb cavities on the upper core layer communicate with the multiple honeycomb cavities on the lower core layer and the multiple through holes on the panel. The invention is used for indoor places where architectural design has higher requirements on acoustics.

The invention discloses a mute power supply. The mute power supply comprises a base and a diesel generating set, wherein the upper end of the base is fixedly connected with a mounting frame, the innerside of the mounting frame is provided with a mounting plate, the diesel generating set is mounted on the mounting plate, the diesel generating set is connected with a fuel inlet pipe, a discharge outlet pipe and a wiring pipe, the fuel inlet pipe, the discharge outlet pipe and the wiring pipe penetrate through the lower portion of the mounting plate, a vibration reduction mechanism connected with the mounting plate is arranged on the base, an inner shell and an outer shell are fixedly mounted at the upper end of the mounting plate, the inner shell covers the outer side of the diesel generator set, the outer shell covers the outer side of the inner shell, and a partition plate fixedly connected with the outer shell is fixedly connected to the outer wall of the upper portion of the inner shell. According to the mute power supply, by arranging the vibration reduction mechanism, effective vibration reduction and silencing effects are achieved, meanwhile, noise leakage of air intake and exhaust is greatly reduced, effective sound absorption and noise reduction can be achieved, and the ultra-silence working effect is achieved.

The invention discloses a combined type indoor green plant feature wall, and belongs to the technical field of feature walls. The combined type indoor green plant feature wall is technically characterized in that the combined type indoor green plant feature wall comprises a frame; glass doors are arranged at the front end and the rear end of the frame; the glass doors and the frame are matched to form a sealed cavity structure; multiple sound absorption columns are arranged in the frame in the length direction at intervals; an installation column is arranged between every two adjacent sound absorption columns; two sets of planting pot units facing the two glass doors correspondingly are arranged on each installation column and are arrayed in a staggered manner; each planting pot unit is connected with a quantitative water adding mechanism, and all the quantitative water adding mechanisms are connected with a water storage tank through pipelines; a sealing cover is arranged on the inner wall of the upper portion of each glass door; liquid crystal display screens are arranged in the sealing covers; and a heat conduction plate is arranged between each liquid crystal display screen and the inner wall of the corresponding sealing cover in a clamped manner. The invention aims at providing the combined type indoor green plant feature wall which is compact in structure, diversified in function and good in three-dimensional decoration effect; and the combined type indoor green plant feature wall is used for indoor decoration and sound attenuation.

The invention provides a sound absorption and noise reduction compound device for an air purifier. A filter part and an impedance compound muffling part are sequentially arranged in the air flow direction. A first sound absorption shell is arranged on the side wall of the filter part. A first air inlet plate is arranged at the air inlet end of the filter part. A first filter layer, a fan and a second filter layer are sequentially arranged in the filter part in the air flow direction. A second air inlet plate is arranged between the filter part and the impedance compound muffling part. A secondsound absorption shell is arranged on the side wall of the impedance compound muffling part. A bell mouth is formed in the air outlet end of the impedance compound muffling part. A reactive muffler and a dissipative muffler are sequentially arranged in the impedance compound muffling part in the air flow direction. The invention further provides a method for air purification, sound absorption andnoise reduction. The sound absorption and noise reduction compound device for the air purifier can effectively combine the advantages of three muffling structures and realize ultra-quiet experience while maintaining large air volume air purification.

The invention discloses a mute motor with an inner shell cooling function. The mute motor comprises a motor shell body, a radiating fin body, a substrate and a bottom sleeve, wherein the radiating finbody is arranged on the outer wall of the motor shell body; the upper end surface of a sliding sleeve is connected with the bottom portion of an ejector rod; the top portion of the ejector rod is arranged on the inner side of a supporting leg; the bottom end of the supporting leg is arranged in a mounting plate; the side of the bottom portion of the supporting leg is attached to a second workingpiece; the second working piece is fixed in the mounting plate; inner grooves are formed at the lower end surface of the mounting plate and the upper end surface of the substrate; balls are arranged in the inner grooves; and the substrate is fixed in the bottom sleeve. The mute motor with an inner shell cooling function adopts a novel structural design to perform effective heat dissipation for themotor shell body while being equipped with a sound structure, and design a shock-absorbing structure with a good use effect to perform effective absorption of the shock generated when the motor is operated so as to reduce the generated noise.

The invention provides building foam and a foam wall formed by splicing the building foam and belongs to the field of building foam. The building foam comprises a foam body which is divided into an upper foam body and a lower foam body. Each foam body comprises a first foam plate, a second foam plate, a third foam plate and a fourth foam plate, the upper foam body is formed by connecting the corresponding first foam plate, the corresponding second foam plate, the corresponding third foam plate and the corresponding fourth foam plate from left to right in sequence, and the lower foam body is formed by connecting the corresponding fourth foam plate, the corresponding third foam plate, the corresponding second foam plate and the corresponding first foam plate from left to right in sequence. A height difference exists between any two of the first foam plate, the second foam plate, the third foam plate and the fourth foam plate; multiple foam bodies are connected, and a through hole is formed by splicing the height difference parts of any two adjacent foam bodies. Indoor and outdoor noise is absorbed through the through holes, meanwhile, effective ventilation of a building is achieved, and the ventilation effect and the noise absorbing effect are good.

The invention discloses a railway inserting plate type super-high strength concrete-micro-porous ceramic compound sound barrier unit plate. The sound barrier unit plate is composed of two rib plates on the periphery, a back plate fixed on the back portions of the rib plates and a micro-porous ceramic sound-absorbing plate fixed between the rib plates; the back plate and the rib plates are prefabricated and combined through reactive powder concrete to form a dovetail-groove-shaped cavity, and the upper end and the lower end of the sound-absorbing plate are each provided with a first oblique plane matched with the dovetail-groove-shaped cavity; the sound-absorbing plate is embedded in the dovetail-groove-shaped cavity to form an embedded fixing structure, and a hollow cavity is formed between the back plate and the sound-absorbing plate. The sound barrier unit plate adopts the reactive powder concrete with super strength, the sound-absorbing plate adopts a micro-porous ceramic body, the sound-absorbing plate is installed by applying structural modes such as embedding and fixing in the stress structure, therefore, the unit plate has better weather resistance, the construction is more reasonable and stable, materials are more environment-friendly, the effects of sound absorbing and noise reducing are obvious, and the maintenance is more convenient and safer in operation.

The invention discloses a large-scale loudspeaker shielding box, aiming to provide a large-scale loudspeaker shielding box which is convenient in structure and stable and durable in use, and has good sound insulation performance. The shielding box includes a box body and a box door (1), the box body includes an inner shielding box and an outer shielding box, the inner surface of the inner shielding box is covered by a sound absorbing wedge (2), a sound insulation board is arranged between the inner shielding box and the outer shielding box, the two sides of the sound insulation board are provided with fireproofing environmental protection and sound insulation cotton, a clamp installing base (3) is arranged inside the inner shielding box, and a connecting panel (4) is arranged on the box body. The large-scale loudspeaker shielding box is applicable to the technical field of large-scale loudspeaker test.

The invention discloses a railway T-shaped beam integration super-high strength concrete-micro-porous ceramic compound sound barrier. The railway T-shaped beam integration super-high strength concrete-micro-porous ceramic compound sound barrier comprises a railway foundation cross beam and rib columns and a sound barrier body which are arranged on the railway foundation cross beam; the lower ends of the rib columns, the upper surface of the foundation cross beam and prefabricated blocking pieces outside the lower ends of the rib columns are mutually connected through embedded bars or bolts, and cast-in-place concrete fully covers and fixes the embedded bars or the bolts; anchoring steel plates and the embedded bars are embedded in the upper surface of the foundation cross beam, the lower ends of the rib columns are fixedly connected with the anchoring steel plates through the bolts, and the prefabricated blocking pieces are provided with the embedded bars and are in concretion connection with the embedded bars in the upper surface of the foundation cross beam. The railway T-shaped beam integration super-high strength concrete-micro-porous ceramic compound sound barrier adopts a structure that prefabricated element pieces are fixedly connected with the cast-in-place concrete on the spot, the building reliability of the element pieces is improved, the quality is guaranteed and stabilized, the efficiency of cast-in-place construction is higher than the efficiency of an existing welding technology, the concrete fully covers metal connecting pieces after casting is completed, the metal connecting pieces can be prevented from rusting and loosing, maintenance-free is achieved, and the stress of each structural piece is more reasonable.

The invention provides a low-frequency broadband composite micro-perforated plate sound absorption structure which comprises a perforated plate, a sound absorption back cavity with an opening in the upper end and a plurality of inclined back plates, submillimeter holes are formed in the perforated plate, the perforated plate covers the opening in the upper end of the sound absorption back cavity, and the inclined back plates are arranged in the sound absorption back cavity. All the inclined back plates are sequentially and fixedly connected end to end from top to bottom to form a snakelike fold line structure, the included angles between all the inclined back plates and the horizontal plane are the same, one ends of the inclined back plates are alternately fixed to the front frame plate and the rear frame plate, and slits are formed between the other ends of the inclined back plates and the left frame plate and the right frame plate. And all the inclined back plates divide the sound absorption back cavity into bent channels. The inclined back plate structure is added in the micro-perforated plate sound absorber, so that the frequency of the sound absorption peak of the micro-perforated plate sound absorber is reduced, and the sound absorption coefficient at the peak frequency is improved; an additional absorption peak is introduced on an original sound absorption curve; and after the porous material is added into the structure, the sound absorption frequency band of the perforated plate is effectively widened.

The invention discloses a bionic microporous noise-reducing structure which is used for an oil fume extraction system. The structure comprises a shell body; oil fume passes by the inner cavity of the shell body and contacts with the inner wall of the shell body; the invention is characterized in that the outer side of the shell body is fixedly provided with a noise-reducing box which is enclosed at the periphery; the noise-reducing box is internally provided with at least one layer of porous plate which is distributed with tight millipores, so the noise-reducing box is divided into at least an inner cavity and an outer cavity; the shell body which is opposite to the porous plate and enclosed in the noise-reducing box is coated and distributed with an oil-preventing coat, moreover, bar-shaped pores are tightly distributed on the shell body; the inner cavity of the shell body is communicated with the inner cavity of the noise-reducing box by the bar-shaped pores, moreover, the bar-shaped pores are slits of louver window type and the vanes of the slits are self-locked. The invention uses a principle of fluid mechanics for effectively preventing the oil fume from blocking the millipores at places such as cochlear duct, air exhaust pipe and the like, finally ensures that the noise-reducing box can effectively achieves the aims of long-term sound absorption and noise reduction, and is especially suitable for household oil fume extraction machine.

The present invention relates to a sound absorber arrangement comprising a plurality of sound absorber elements which are arranged in a room (01) having walls and a ceiling which closes off the room to the top. A plurality of juxtaposed sound absorber elements form one or more absorber strips (03) which extend at least in certain portions along an upper abutting edge which extends between the walland ceiling of the room (01). The sound absorber elements have a width of 200-400 mm and a thickness of 40-65 mm. The sound absorber elements have a length-specific flow resistance in the range of 5-20 kPa*s / m<4>. The invention further relates to a sound-damped room (01) having such a sound absorber arrangement.

The invention provides a composite damping plate for low and medium frequency noise reduction switching. The composite damping plate comprises mass strips, a sticky elastic film layer and composite layers. A plurality of mass strips are arranged, the mass strips are in a circular ring shape and are arranged in a concentric circle grouping mode, the peripheries of the mass strips are wrapped and wound with electro-sensitive expansion strips, the electro-sensitive expansion strips are connected with a circuit controller through wires, and the mass strips are bonded through the sticky elastic thin film layers in a pouring mode; the composite layers are located on the outer side of the composite damping plate and provided with a plurality of through holes, and the composite layers are correspondingly pressed to the two sides of the viscous elastic film layer through a viscous state damping rubber material; and the electro-sensitive expansion strips change the surface tension of the viscous elastic film layer between the adjacent mass strips in a power-on expansion manner. According to the composite damping plate for low and medium frequency noise reduction switching, noise of different frequencies can be reduced, and the noise reduction performance and the noise reduction effect are improved.

The invention relates to a wheel with a sound absorption device, the sound absorption device (10) is mounted in a wheel air chamber (30) for reducing acoustic resonance, and the sound absorption device comprises two resonance sound absorption structure units which are connected in parallel; wherein a first sound absorption frequency band of the first resonant sound absorption structure unit (10-1) and a second sound absorption frequency band of the second resonant sound absorption structure unit (10-2) are adjacent to each other or partially overlapped, the resonance frequency of the wheel air chamber is included in the adjacent position of the first sound absorption frequency band and the second sound absorption frequency band or the overlapping area of the first sound absorption frequency band and the second sound absorption frequency band. According to the technical scheme, organic combination of Helmholtz resonance sound absorption and structural resonance sound absorption can be achieved on the wheel, the sound absorption frequency band is wider, the sound absorption amount is higher, and the more effective sound absorption effect is achieved.

The invention provides an acoustic metamaterial noise reduction damping plate. The damping plate comprises: a mass unit group consisting of at least two metal mass blocks which are uniformly arranged in a linear manner at intervals, wherein the outer sides of the metal mass blocks are coated with electro-sensitive expansion strips, and the mass unit group is provided with circuit controllers for controlling the expansion of the electro-sensitive expansion strips; and viscous elastic films used for adhering all groups of metal mass blocks, wherein the composite layers are connected to the two sides of the viscous elastic films in a pressed mode through a viscous flow state damping rubber material. A plurality of mass unit groups are arranged in an array and are spaced by a soft frame, the thickness of the metal mass block is greater than that of the adhesive elastic film, the adhesive elastic film is adhered to the thickness center of the metal mass block, and the composite layer is provided with a plurality of punched holes. According to the invention, the influence of low and medium frequency noise on people and equipment can be weakened, the low and medium frequency noise reduction capability is improved, and the noise at a specific frequency can be reduced in an optimized manner.

A stamping processing device. Provided is a stamping processing device with simple structure and improved vibration isolation reliability. It includes a stamping processing unit and a vibration isolation mechanism. The stamping processing unit is set on the foundation through the vibration isolation mechanism. The vibration isolation mechanism is: a vibration isolation groove is provided on the foundation, and the stamping processing unit passes The platform is set in the vibration isolation groove; the counterweight platform is provided with a perforation, and a piercing rod is provided in the perforation, and the two ends of the piercing rod are respectively provided with sound-absorbing components, and the sound-absorbing components are located on the counterweight platform The sound-absorbing assembly sequentially includes sound-absorbing cotton, springs and sound-absorbing cotton; and also includes shock absorbers, and the shock absorbers are all arranged on the bottom surface of the counterweight platform. The invention is convenient for processing and reliable in operation.

The invention discloses sound-absorbing wall body filler and a preparation method thereof. A raw material containing the sound-absorbing wall body filler comprises sludge, sulphate aluminium cement, water, calcium hydroxide, hydrolytic polymaleic anhydride and a water reducer. The preparation method comprises the following steps: sludge pre-treatment; mixing and placing; stirring; die-filling; die-disassembling; and maintenance. The sludge-containing sound-absorbing building material produced is the environment-friendly sound-absorbing building material which has excellent insect preventing, corrosion preventing and sound absorbing abilities, and the alkaline environment thereof inhibits growth of bacteria, so that sludge organic matters of a water plant are prevented from giving out peculiar smells under the action of bacteria. Meanwhile, the sulphate aluminium cement is added, so that the product strength is improved to 5MPa, and the demand on the wall body filler is met. The raw material is a pollutant of sludge of the water plant. After the product is manufactured, the environment can be protected, secondary pollution of sludge of the water plant on soil and water is reduced, the economical benefit can be also created, and the sound-absorbing wall body filler not only is economical, but also is environmentally friendly.

The invention discloses a compressor exhaust structure and a compressor with the exhaust structure. The compressor exhaust structure comprises: a closed casing with an oil storage pool for storing lubricating oil at the bottom of the inner cavity; The component is arranged at the bottom of the inner cavity of the airtight casing, and the compression component has an exhaust port; the sound-absorbing cavity is arranged above the compression component, and the sound-absorbing cavity is connected with the exhaust port of the compression component; it also includes: an exhaust channel, one end It communicates with the sound-absorbing cavity, and the other end communicates with the oil storage tank. In the compressor exhaust structure of the present invention, the muffler cavity is communicated with the oil storage pool at the bottom of the housing cavity through the exhaust channel, so that the high-pressure gas compressed in the cylinder enters the oil storage pool through the exhaust channel, and the liquid is more Strong sound absorption ability, effectively absorbing the airflow noise discharged into the oil pool, especially the high-frequency components, which makes the exhaust airflow pulsation noise dull, thus effectively improving the sound quality of the compressor.

The invention relates to an anti-warp floor easy to lay and a manufacturing method thereof. The floor comprises a floor body. The floor body is in a rectangular slab shape. One edge of the floor body is provided with multiple upper clamping buckles and the opposite edge is provided with multiple lower clamping buckles. An interval is reserved between every two adjacent upper clamping buckles. An interval is reserved between every two adjacent lower clamping buckles. The edge, provided with the upper clamping buckles, of the floor body can be buckled to the edge, provided with the lower clamping buckles, of another floor body. The method includes the following steps of firstly, material selection, secondly, material machining, thirdly, material bonding and fourthly, machining of one set of opposite edges of the floor body. The anti-warp floor is easy to mount, the manufacturing method is simple, and the bonding performance between layers of materials of the floor body can be guaranteed.

The invention provides a sound absorption and noise reduction compound device for an air purifier. A filter part and an impedance compound muffling part are sequentially arranged in the air flow direction. A first sound absorption shell is arranged on the side wall of the filter part. A first air inlet plate is arranged at the air inlet end of the filter part. A first filter layer, a fan and a second filter layer are sequentially arranged in the filter part in the air flow direction. A second air inlet plate is arranged between the filter part and the impedance compound muffling part. A secondsound absorption shell is arranged on the side wall of the impedance compound muffling part. A bell mouth is formed in the air outlet end of the impedance compound muffling part. A reactive muffler and a dissipative muffler are sequentially arranged in the impedance compound muffling part in the air flow direction. The invention further provides a method for air purification, sound absorption andnoise reduction. The sound absorption and noise reduction compound device for the air purifier can effectively combine the advantages of three muffling structures and realize ultra-quiet experience while maintaining large air volume air purification.