726 results about "Acoustic quieting" patented technology

The invention discloses a noise reduction method and system for a high-performance TWS Bluetooth audio chip, and relates to the technical field of acoustoelectric integration, and the method comprises the steps: collecting an environment noise signal, synchronously obtaining a Bluetooth radio frequency interference signal, converting the Bluetooth radio frequency interference signal into a digital signal through a 24-bit analog-to-digital converter, and outputting a multi-modal noise feature matrix; performing noise separation and reverse sound wave generation on the multi-modal noise characteristic matrix by using a pre-trained lightweight CycleGAN model, and outputting a reverse sound wave signal; monitoring auditory meatus tightness parameters in real time, dynamically adjusting phase offset and frequency response balance parameters of the mixed noise reduction signals, and outputting optimized noise reduction signals adaptive to the current wearing state; and performing parameter calibration on the optimized noise reduction signal through anechoic chamber scene simulation and laser interferometer phase detection to generate a noise reduction control instruction set. According to the invention, the noise interference problem of the TWS earphone in a complex environment is effectively solved.

The invention discloses a transformer with a noise reduction function, and relates to the technical field of transformers, the transformer comprises a shell, an air outlet and an air inlet of the shell are formed in the upper side and the lower side respectively, a connecting shell is fixedly connected to the top of the shell, and a plurality of transformer bodies are arranged in the shell; a radiator used for radiating heat of the transformer body is arranged in the shell, air cylinders symmetrically distributed along the shell are fixedly connected into the shell, and a fixing frame is fixedly connected to the side, close to an air outlet, of the interior of the shell. The multiple first sound absorption plates distributed in the N shape are arranged close to the air outlet, a complex labyrinth type airflow channel is formed, sound waves need to be reflected and refracted multiple times in the transmission process, part of sound wave energy can be consumed in each reflection, meanwhile, noise can be prevented from being transmitted out from hinge shaft seams of the first rotating plates through the noise reduction pads, and therefore the noise reduction effect is improved. The leakage of most noise is blocked, so that the effect of attenuating the noise is achieved.

The utility model relates to the field of fuel gas pressure regulation, in particular to a double-layer noise reduction valve cage and a regulating valve, which comprises an inner-layer valve cage, a plurality of first noise reduction holes, a second-layer valve cage and a third-layer valve cage, the outer-layer valve cage is arranged outside the inner-layer valve cage in a sleeving manner and fixedly connected with the inner-layer valve cage, and a plurality of second silencing holes which are arranged according to a second rule are formed in the outer-layer valve cage; and the inner-layer valve cage and the outer-layer valve cage are coaxially arranged. According to the utility model, the inner-layer valve cage is used for preliminarily dispersing pressure waves and noise of fluid through the plurality of first silencing holes arranged according to the first rule, the outer-layer valve cage is used for further absorbing and scattering residual noise generated by the inner-layer fluid through the second silencing holes, and the inner-layer valve cage and the outer-layer valve cage are coaxially arranged; the additional flow resistance generated when fluid penetrates through different layers can be reduced, and meanwhile the continuity of a flow channel is guaranteed. Under the conditions of high pressure difference and large flow, noise of the regulating valve is effectively reduced, it is ensured that the noise level does not exceed 85 decibels, and the requirements of specific application occasions are met.

The utility model discloses a pressure regulator with a silencing function, and belongs to the technical field of pressure regulation and stabilization, an internal silencer and an external silencer are additionally arranged on the basis of the structure of an axial-flow type pressure regulator, when a valve cylinder is separated from a valve clack and a valve port seat, gas flows out through a silencing through hole of the internal silencer, and when the gas flow speed is high enough, the gas flow speed is high enough, and the gas flow speed is high enough. The noise reduction through holes can move the frequency spectrum of exhaust noise to high frequency, the audible sound part in the noise frequency spectrum is reduced, and therefore interference of the noise to the environment is reduced, the noise reduction barrel filled with the spring is arranged in the external silencer, when airflow passes through the spring in the noise reduction barrel, the spring in the noise reduction barrel can absorb kinetic energy generated by airflow impact, and the noise reduction effect is improved. When the airflow passes through the rectifying plate at the open end of the external silencer, the airflow passes through the multiple layers of perforated plates, layered diffusion and pressure reduction are achieved, the pressure and the flow speed of the fluid are reduced, meanwhile, the flow direction of the fluid is integrated, impact on the pipe wall is reduced, and the effect of reducing the noise is achieved.

The utility model relates to the field of air conditioner air outlet devices, in particular to a central air conditioner air outlet noise reduction device which comprises an air receiving barrel, a bucket-shaped air expanding cover, an air outlet cover, a noise reduction frame, an air direction guiding frame and a protection frame. A hopper-shaped air expanding cover is arranged at the lower end of the air receiving barrel, an air outlet cover is arranged at the lower end of the hopper-shaped air expanding cover, an embedded groove is formed in the end, away from the hopper-shaped air expanding cover, of the air outlet cover, and a noise reduction frame, an air direction guiding frame and a protection frame are sequentially arranged in the embedded groove. According to the air conditioner air outlet device, noise generated by airflow resonance is effectively reduced through the air expansion flow guide design of the hopper-shaped air expansion cover and the sound absorption cotton plate filling of the sound attenuation and noise reduction frame, airflow can be evenly and softly blown to a room through the design of the air direction guide frame, and the problems that airflow in a traditional air conditioner air outlet device is too strong and uneven in distribution are solved.

The utility model discloses an air source heat pump unit with noise reduction and sound insulation, which relates to the technical field of air source heat pump units and comprises a front cover component and an air source heat pump body, the air source heat pump body is mounted in the front cover component, one side of the front cover component is connected with a movable plate, and a base component is mounted at the bottom of the front cover component. The back side of the front cover assembly is connected with a back plate assembly, and wall hanging pieces are symmetrically installed on the side, away from the front cover assembly, of the back plate assembly up and down. According to the air source heat pump unit with the noise reduction and sound insulation functions, the noise reduction pad and the damping plate are arranged on the inner wall of the front cover body, meanwhile, the noise reduction net rack is installed on the surface of one side of the back plate main body, and the movable plate is matched for combined use, so that the noise reduction and sound insulation functions can be provided for operation of the air source heat pump main body as much as possible, and noise pollution caused by device operation is reduced; in addition, through the use of the base assembly and the wall hanging piece, the whole device can be selectively fixed to the wall or the ground according to use requirements.

The invention discloses a muffling device, an air conditioner and a muffling control method.The muffling device comprises a shell, an acoustic metamaterial structure and a sound conduction interface, the acoustic metamaterial structure is arranged in a muffling cavity of the shell and is constructed to be a continuous swirling flow channel capable of prolonging a sound wave propagation path in the muffling cavity, and the sound conduction interface is arranged in the shell; the sound conduction interface is arranged at the joint of the shell and the valve pipe. Noise firstly enters the shell through the sound conduction interface, so that sound wave reflection loss is avoided; in the silencing cavity, the continuous swirling flow channel of the acoustic metamaterial structure forces the propagation path of sound waves to be greatly prolonged in a limited space, so that low-frequency resonance noise is effectively inhibited; meanwhile, a physical closed environment provided by the shell isolates external aging factors, and the problems that a traditional rubber damping material loses efficacy due to hardening and the performance of sound insulation cotton is degraded are solved; according to the invention, the risk of new resonance caused by frequency deviation is fundamentally avoided, and synchronous control and long-term reliable noise elimination of low-frequency noise are realized.

The invention discloses an engine exhaust silencing device, which belongs to the technical field of engine exhaust silencing, and comprises a sound insulation cover, the sound insulation cover comprises a frame, an embedded sound absorption plate and a sound absorption partition plate are fixedly mounted in the frame, the sound absorption partition plate divides the sound insulation cover into a first sound absorption chamber and a second sound absorption chamber, an engine is arranged in the first sound absorption chamber, and the second sound absorption chamber is arranged in the second sound absorption chamber; the top of the first sound absorption chamber communicates with an axial flow fan, and the top of the axial flow fan communicates with an air inlet silencer. Through cooperation of the air inlet silencer, the air exhaust silencer, the embedded sound absorption plate, the sound absorption partition plate and the first silencing mechanism, the multiple silencing effect of engine exhaust is achieved, the vibration state of the sound absorption partition plate can be monitored and adjusted in real time through the rotating arm and the swing mechanism, and sound waves generated by exhaust are eliminated as much as possible; and by arranging the switching mechanism and the second silencing mechanism, the silencing effect can be improved when the gas displacement of the engine is increased.

The invention relates to the technical field of steam turbine noise reduction covers, in particular to a low-noise noise reduction cover shell based on a multi-layer composite structure, which comprises a top plate, side plates, side plates, composite noise reduction strips and noise interference pieces, the two side plates are symmetrically arranged below the top plate, the two side plates are arranged between the two ends of the two side plates, the upper parts of the side plates are attached to the top plate, and the noise interference pieces are arranged on the top plate. The multiple composite noise reduction strips are attached between the side plates and the inner wall of the top plate at equal intervals. The sound wave speed is increased after noise penetrates through the noise interference piece, then the accelerated sound wave interferes with the noise penetrating through the noise interference piece under the refraction and reflection effects of the composite noise reduction strip, the sound wave intensity is greatly reduced, and the magnetic sheet vibrates due to sound wave transmission. The problems that in the prior art, due to large mechanical vibration, the sound absorption effect of sound absorption materials cannot be effectively guaranteed for a long time, regular replacement is needed, and the noise reduction cost of a steam turbine is high are solved.

This utility model relates to a noise reduction structure for a DC motor, wherein the noise reduction structure (1) is disposed within a cavity for accommodating a commutator (2) and close to the sound source. The noise reduction structure (1) can be a honeycomb structure, a square structure, a circular structure, or a regular polygonal structure, and can be disposed on the bottom surface of the cavity, or simultaneously on the sidewalls and bottom surface of the cavity. The noise reduction structures (1) can be evenly distributed on the bottom surface and sidewalls of the cavity, or staggered. In addition, the noise reduction structure (1) can also be disposed within the cavity of a gearbox (5), including at the bottom of the gearbox cavity (6), or simultaneously on the bottom and cavity walls of the gearbox cavity (6). Using this noise reduction structure for a DC motor, the sound waves generated by the sound source are effectively reflected and canceled out by the noise reduction structure, thus reducing the noise of the DC motor and possessing certain practical value.

The utility model relates to a sewage well of a municipal road, which comprises a well body, a first support plate connected to the upper part of the well body, a well lid clamped on the first support plate, a water outlet arranged on the well lid, a second support plate connected to the middle part of the well body, an anti-falling net clamped on the second support plate, and a double-cavity noise reduction structure connected to the middle lower part of the well body. And the interior of the double-cavity silencing structure is connected with a sound absorption middle cavity. The double-cavity silencing structure is arranged, sound waves can be reflected when entering the small-caliber part of the double-cavity silencing structure, part of the sound waves can be reflected back, the rest of the sound waves continue to move, the two parts of the sound waves meet again to form destructive interference, and therefore noise is reduced, the energy density of the sound waves is high in the narrow part in the middle, and noise is reduced. The sound absorbing material in the double-cavity silencing structure absorbs part of sound wave energy, so that the strength of sound waves is reduced, when the sound waves enter a large space again, the energy density is reduced, the sound waves are further diffused, and therefore noise caused by sewage flowing is reduced.

The invention discloses a firmly-connected assembly type noise reduction floor, and belongs to the technical field of assembly floors, the firmly-connected assembly type noise reduction floor comprises a vibration reduction panel and a sound absorption base, the vibration reduction panel is mounted at the top of the sound absorption base, the sound absorption base comprises a sound insulation supporting box, and a plurality of first sound absorbers and a plurality of second sound absorbers are arranged in the sound insulation supporting box; the first sound absorbers and the second sound absorbers are evenly distributed in an array mode, sound conducted from bottom to top is absorbed through the first sound absorbers, sound conducted from top to bottom is absorbed through the second sound absorbers, and the vibration reduction panel comprises a first vibration reduction plate. A second vibration reduction plate, a third vibration reduction plate, a fourth vibration reduction plate and a sound insulation supporting plate are sequentially arranged on the lower portion of the first vibration reduction plate from top to bottom, the sound insulation supporting plate and a sound insulation supporting box are mutually clamped and fixed, various scratching and scraping damages in the external environment are borne, various liquid pollutants and solid pollutants are blocked, overall damage and pollution are avoided, and the sound insulation effect is good. And a user can conveniently take care.

The utility model relates to the technical field of noise reduction plates, and discloses a shock absorption and noise reduction plate which comprises a shock absorption and noise reduction plate body, a shock absorption groove is formed in the outer surface of the front side of the shock absorption and noise reduction plate body, and a first damping rubber pad adheres to the inner surface of the rear side of the shock absorption groove. First rubber blocks are arranged at the positions, close to the four corners, of the outer surface of the front side of the first damping rubber pad, first clamping grooves are formed in the outer surfaces of the front sides of the four first rubber blocks, damping springs are connected to the interiors of the four first clamping grooves in a clamped mode, and a partition plate is fixedly connected to the position, close to the center, of the inner surface wall of each damping groove; the utility model solves the problem that the working efficiency of the equipment is reduced because the ideal noise reduction and sound attenuation effect cannot be achieved due to overhigh sound vibration frequency when the traditional sound attenuation plate is generally applied to places with higher noise, such as a music hall and the like.

The utility model discloses an environment-friendly veneer composite acoustic board, and relates to the technical field of composite acoustic boards. The inner portion of the sound inlet plate layer is fixedly connected with a silencing pipe, the top of the sound inlet plate layer is fixedly connected with a silencing plate layer, the top of the honeycomb core layer is fixedly connected with a silencing cotton layer, and the top of the silencing cotton layer is fixedly connected with an environment-friendly composite plate layer. Due to the fact that the honeycomb-shaped structure is arranged in the honeycomb core layer, a closed space which is approximately closed can be formed between the silencing cotton layer and the silencing plate layer, air flowing is prevented, sound waves are prevented from being blocked, the sound absorption coefficient is improved, and most noise can be absorbed and eliminated when the sound passes through the interior of the silencing pipe. And the sound guide pipe is matched with the silencing pipe, so that residual noise is guided into the silencing plate layer, and the residual noise is completely absorbed.

The utility model discloses a multi-branch noise reduction air distribution box, and belongs to the technical field of fresh air systems, the multi-branch noise reduction air distribution box comprises a box body and a connecting pipe, the box body is composed of a first box shell and a second box shell, and an air distribution space is formed between the first box shell and the second box shell; the air distribution box is novel in design and ingenious in device, when the air distribution box is installed, pipeline openings of the air inlet pipe and the connecting pipe are in butt joint through the connecting mechanisms on the air inlet pipe and the connecting pipe, then the connecting pipe is rotated by 45 degrees, a first protruding block on the air inlet pipe extends into a second groove of a second connecting buckle on the connecting pipe, and meanwhile the air distribution box is installed. The second protruding block on the connecting pipe can extend into the first groove of the first connecting buckle on the air inlet pipe, so that tight connection is formed between the air inlet pipe and the connecting pipe, operation is simple, rapid and convenient, the installation efficiency can be improved, the air distribution box can be rapidly disassembled when needing to be maintained, and therefore installation and maintenance are improved, and the service life of the air distribution box is prolonged. And the practicability of the device is greatly improved.

This utility model discloses a negative pressure compressor silencer made of composite sound-absorbing material, including a negative pressure fan body and a silencer pipe fixedly installed on the air inlet end of the negative pressure fan body. An air inlet channel is fixedly installed on the inner wall of the silencer pipe, and a primary noise reduction mechanism is provided on the inner wall of the air inlet channel near the pipe opening. The primary noise reduction mechanism includes an air inlet cylinder fixedly installed on the inner wall of the air inlet channel, and multiple air inlets are opened on the outer wall of the air inlet cylinder. This utility model, through the inner ring silencer cylinder, outer ring silencer cylinder, and silencer ring cylinder of the primary noise reduction mechanism forming a multi-stage sound absorption structure, utilizes the cooperation between the silencer holes and the annular cavity to allow sound waves to reflect and diffract between different cavities, effectively absorbing mid-to-high frequency noise. The coaxial and annular array distribution design of the air inlets guides the airflow to enter evenly, reducing the generation of eddy noise. The composite structure of the perforated metal cylinder and the sound insulation felt further blocks the transmission of noise, improving the broadband noise reduction effect.

The utility model discloses a noise reduction type drainage pipeline, which belongs to the technical field of drainage pipelines, and comprises a first pipe body and a second pipe body, the right side of the first pipe body is provided with a connector, the left side of the second pipe body is provided with a connecting seat, the top and the bottom of the connecting seat are both fixedly provided with rectangular grooves, and the rectangular grooves are communicated with the first pipe body and the second pipe body. Limiting rods are fixedly connected to the left side and the right side of an inner cavity of the rectangular groove, the outer sides of the limiting rods are movably sleeved with limiting blocks, lantern rings are fixedly connected to the top of the limiting block at the top and the bottom of the limiting block at the bottom, and silencing layers are arranged in inner cavities of the first pipe body and the second pipe body. According to the utility model, two pipelines can be conveniently and quickly spliced, the operation by virtue of an auxiliary tool is avoided, the installation efficiency of workers is improved, a certain silencing effect is achieved, the sound generated when water flows in the pipelines can be reduced, and the comfort of living and working is improved.

This invention discloses an acoustic logging device and method for eliminating interference from seismic sources, belonging to the field of acoustic logging technology. It includes a cover plate and a logging instrument. A silencing plate and a handle are fixedly connected to the upper side of the cover plate. The surface of the silencing plate is designed with a honeycomb pattern. An elastic pad and a connecting cylinder are fixedly connected to the lower side of the cover plate. A connecting seat is fixedly connected to the lower side of the connecting cylinder. The logging instrument is located below the cover plate. A connecting column is fixedly connected to the upper end of the logging instrument, and the connecting column is inserted into the connecting seat and threadedly connected to it. The cover plate and logging instrument are designed as separate units for easy transportation and carrying. They can be installed independently during use, and the installation process is simple and reliable. By setting the elastic pad and the silencing plate to work together, the controllability of seismic source signal interference elimination is achieved. It is suitable for various measurement environments, effectively reducing the interference of environmental noise on acoustic wave transmission and reception, and improving the measurement accuracy of acoustic logging.

The application discloses a noise reduction air inlet air duct of a dust collector body, and relates to the technical field of dust collector accessories, which comprises a dust collector body and a noise reduction assembly. A double-layer nested first cylinder and a second cylinder are arranged in the ventilation pipeline of the noise reduction assembly. The first cylinder and the second cylinder are respectively provided with first through holes and second through holes which are staggered and communicated to form sound holes. When the device is working, the air duct airflow pressure cooperates with the magnetic control air path and the spring reset structure to adaptively adjust the effective communication cross-sectional area of the sound holes according to the operating power of the dust collector. In the high-power working condition, the aperture is automatically enlarged to improve the full-band noise reduction effect, and in the low-power working condition, the aperture is reduced to avoid negative pressure and air volume loss. Meanwhile, the composite noise reduction material, the split pipeline and the detachable sealing locking connection structure are matched. The problems that the traditional fixed sound holes cannot adapt to multiple working conditions and the noise reduction and dust collection performance are difficult to be considered are solved.

The utility model belongs to air conditioner compressor technical field especially relates to a kind of noise reduction structure of air conditioner compressor sound attenuation package, including frame, air inlet and air outlet are set up on frame, frame has sound attenuation chamber inside, noise enters from air inlet, to sound attenuation chamber inside, then noise passes through air outlet and enters into gas storage chamber, in turn through upper support plate, middle support plate and lower support plate, finally from exhaust port inside the noise is discharged, when noise spreads to sound attenuation chamber inside, will first collide with assembly component, noise will occur reflection, refraction and scattering and other phenomena in the process of collision, so that noise is in the bounce space Bounce back.And in the bounce process, the energy of noise will be gradually consumed and dispersed, because installation frame is installed at air outlet, to lengthen the path of noise, further reduce noise;Compared with prior art, the utility model thereby improves sound attenuation effect.

The invention relates to the field of noise reduction, in particular to a blower silencer, a blower silencing device and a noise reduction blower. The blower silencer comprises a hard cavity, a microporous medium filled in the hard cavity, and an airflow channel penetrating through a hard end face of the hard cavity and the interior of the microporous medium. An air outlet and an air inlet are respectively formed in two ends of the airflow channel; the Young modulus of the hard cavity is greater than 1MPa; the microporous medium is a microporous material or a component processed with micropores; the hard cavity, the microporous medium and the airflow channel form an assembly with a series of resonant frequencies, and within the spectral range of the resonant frequencies, acoustic wave impedance in the airflow channel is lower than air impedance, so that acoustic wave propagation is hindered. The hair dryer solves the problem that hearing may be damaged due to the fact that an existing hair dryer is too high in noise.

The present invention relates to a compressor including a compression mechanism adapted to compress a fluid and a sound deadening partition for partitioning an internal space of the compressor into a high-pressure side and a low-pressure side, the sound deadening partition including a mounting hole and an insert mounted in the mounting hole, the fluid compressed by the compression mechanism being discharged to the high-pressure side via a passage of the insert and then to the outside of the compressor, the insert having an interference fit with the mounting hole and having an interference fit portion, and a protruding section protruding toward the high-pressure side direction with respect to the remaining portion of the sound deadening partition being provided at a portion of the sound deadening partition adjacent to the interference fit portion. The present invention provides a compressor improved in sound deadening configuration and safety reliability.

The utility model relates to the technical field of sound attenuation equipment, specifically relates to a compressor sound attenuation device, including compressor, the bottom plate of installing compressor, the cavity containing compressor and the top -tight mechanism of connecting cavity and compressor, the cavity is composed of the upper end cover of open and close and the closed wall body, its lower end opening is fixedly connected with the bottom plate, still has the through -hole of connecting compressor copper pipe on the upper end cover, and the top -tight mechanism is connected in the lower part and the upper part of compressor in pairs, and two pairs of top -tight mechanism are cross -distributing in the four -around of compressor on the projection plane, and the mounting seat of connecting top -tight mechanism is still provided in the closed wall body. The utility model discloses a compressor sound attenuation device, through the cavity of close connection with the shell, the compressor is contained and fixed in the cavity, reduces the noise of compressor, and the top -tight mechanism is still provided between the cavity and compressor to reduce or eliminate the vibration noise produced when the compressor works.

The invention relates to the technical field of hub polishing, in particular to a rear axle hub special polishing device capable of preventing environmental pollution, which comprises a base, a second sound insulation layer is arranged on the base, a first sound insulation layer forming a double-layer structure with the second sound insulation layer is arranged in the second sound insulation layer, and a top cover is overturned on the second sound insulation layer. And a silencing mechanism is arranged on the second sound insulation layer, and the silencing mechanism comprises a rotating rod rotating at the center of the bottom of the second sound insulation layer. In the working process, an interlayer between the second sound insulation layer and the first sound insulation layer gradually tends to be in a vacuum environment, energy can be rapidly attenuated when sound waves are transmitted in an air rarefied medium, noise generated by polishing is rapidly attenuated, and the situation that workers are injured by the noise due to long-time work is avoided; and the pollution of noise to the environment is reduced.

The invention relates to the field of masks, and discloses a mask and a control method thereof, the mask comprises a mask body, a secondary sound source device and a voice signal acquisition part; the mask body comprises a mouth and nose wrapping structure and a mask shell, and the mouth and nose wrapping structure is connected with the mask shell; the voice signal acquisition part comprises a main microphone, and the main microphone is arranged on the inner side of the mouth and nose wrapping structure; the secondary sound source device is arranged on the outer side of the mask shell and works based on a control instruction. According to the mask, user sound or environmental noise is collected through the voice collecting part, the secondary sound source device sends out corresponding sound according to user requirements or conducts phase reversal processing on sound waves, and sound opposite to the user is sent out to achieve sound wave counteracting near the air outlet so as to achieve the purpose of active noise reduction; or scrambling signals such as white noise, environment sound and scene sound are generated, and user voice is hidden to the maximum extent; or the sound of the user is amplified, so that the sound is clearer and more stable.

The invention relates to the technical field of breathing machines, in particular to an improved breathing machine air path noise reduction method and device.The improved breathing machine air path noise reduction device comprises a draught fan upper cover, a draught fan upper silica gel pad, draught fan upper sealing silica gel, a draught fan, a draught fan silica gel supporting frame, a draught fan bin body, draught fan lower sealing silica gel, a draught fan bottom cover and an air inlet silencer. The airflow can flow uniformly and orderly, turbulent flow and vortex are reduced, and noise generated by airflow separation and pressure fluctuation is reduced. Air passes through the silencing silica gel block and then enters the S-shaped air channel of the fan bottom cover, the layout utilizes space, the sound wave propagation distance is prolonged, and more noise energy is consumed. A silica gel corrugated pipe is designed at the air outlet, and the damping performance is improved through a triple mechanism. The contact positions of the fan, the fan bin body and the upper cover are isolated through silica gel, radial impact force and vibration are blocked, and operation noise is reduced. The problem that an existing breathing machine depends on noise reduction cotton to reduce noise, and pollution is prone to being generated is solved.

The utility model relates to the field of noise reduction equipment, specifically disclose a sound attenuation room of reducing noise, including a plurality of by the sound attenuation room main part of inner panel and outer panel, the sound attenuation room main part is connected each other through the connecting structure to form a casing with the cavity, the sound attenuation room main part adopts integrated structure, constitutes by the wallboard of Q235A material, ceiling and access door, and ceiling can be individually detached, the sound attenuation room is filled with fire -resistant sound attenuation cotton, and the fire -retardant sound attenuation cotton is cut even neat and tightly wrapped in the wallboard, the utility model provides a sound attenuation room of reducing noise, through the connecting design of optimization air duct and wallboard, reasonable layout equipment, adopt sound insulation material and set up sound attenuation device etc.

An intake pipe integrating two silencing structures includes a pipe body formed by the joining of an upper shell and a lower shell. A first opening and a second opening are formed on the bottom wall of the lower shell. A first cylinder and a second cylinder are integrally formed on the outer bottom surface of the lower shell, corresponding to the positions of the first and second openings, respectively. The opening of the first cylinder overlaps with the first opening and forms a wavelength tube within the first cylinder. The opening of the second cylinder overlaps with the second opening, and a cover plate is provided over the second opening. A third opening is formed in the middle of the cover plate. An annular baffle is integrally formed on the bottom surface of the cover plate, corresponding to the position of the third opening. The cover plate, the annular baffle, the second cylinder, and the third opening form a holmhertz silencer. By integrating a wavelength tube and a holmhertz silencer on the intake pipe, a wider frequency band can be covered, forming a complementary effect, thereby reducing mid-to-high frequency noise and low-frequency noise within the intake pipe respectively. This invention has a simple structure and is easy to manufacture and assemble.

The utility model discloses a noise reduction air receiving port, which comprises a square frame, an outer plate, a shell, an air inlet, an air inlet pipeline, an air outlet joint, an inner plate and an air outlet, the outer plate is arranged above the square frame, the shell is arranged on the outer plate, the air inlet is arranged on the shell, one side of the shell is connected with the air inlet pipeline, and the other side of the shell is connected with the air outlet joint. One end of the air inlet pipeline is communicated with the air inlet in the shell, and the other end of the air inlet pipeline is communicated with an air outlet connector. An inner plate is installed below the square frame, an air outlet is formed in the inner plate and communicated with the air outlet end of the air outlet connector, the shell is of a square structure with an opening in the top, an air inlet is formed in the side wall of the shell, the air inlet pipeline is a porous noise reduction air channel, the air outlet connector is composed of two air channel connectors, and the air inlet connector is connected with the air inlet pipeline. According to the utility model, wind noise and external sound can be reduced, so that the sound insulation effect of the cabin body is improved, and wind circulation is kept.

This invention relates to a spiral noise-canceling earphone, comprising: an earphone head including a front cavity and a rear cavity opposite to the front cavity, wherein a sound-generating unit is disposed within the front and rear cavities; one end of the rear cavity that connects to the front cavity is designated as the front end, and the other end as the rear end; the inner wall of the rear cavity extends from the front end to the rear end, and the distance to the center of the rear cavity decreases as it approaches the rear end; a noise-canceling structure is provided on the inner wall of the rear cavity, the noise-canceling structure including a first spiral ridge, a second spiral ridge, and a spacer groove; the first spiral ridge and the second spiral ridge extend clockwise or counterclockwise from the front end of the rear cavity along its inner wall to the rear end; through the cooperation of the first spiral ridge, the second spiral ridge, and the spacer groove, combined with the conical cavity and the gradually changing width of the spiral ridge, a complex sound wave propagation path is formed; when noise passes through these spiral channels, the sound waves are subjected to multiple reflections and interferences, resulting in gradual energy attenuation, thereby achieving the effect of eliminating noise and improving sound quality.