761 results about "Acoustic noise reduction" patented technology

The embodiment of the invention discloses a speech enhancement method and device based on a generative adversarial network model, and electronic equipment, and can solve the problems of how to more accurately and effectively reduce the noise influence and improve the definition and quality of an audio signal. The method comprises the following steps: acquiring to-be-processed voice data; performing convolution processing on the to-be-processed voice data by generating a target generator in the adversarial network model to obtain initial voice data, the target generator comprising an expansion convolution layer and a standard convolution layer, and the target generator being obtained by co-training an adversarial loss function, a perception loss function and a reconstruction loss function; through a target discriminator in the generative adversarial network model, the initial voice data and the to-be-processed voice data are discriminated to obtain a target discrimination result, and the target discriminator comprises a time domain discriminator and a frequency domain discriminator; and when it is detected that the target discrimination result satisfies a preset requirement, determining that the initial voice data is voice data after voice enhancement of the to-be-processed voice data.

An earmuff includes a first earmuff ring configured to sit against a user's head about a user's ear and a first earmuff cap including an opening and including a noise reduction member being movable relative to the earmuff ring between a first position entirely covering the opening and a second position at least partially exposing the opening, the earmuff cap having a first noise reduction rating in the first position and a second noise reduction rating in the second position that is different than the first noise reduction rating.

The invention belongs to the technical field of regulating valve noise reduction, and particularly relates to a sleeve multi-stage noise reduction regulating valve system which comprises a sleeve multi-stage noise reduction regulating valve, a pneumatic diaphragm actuator, an air source control device, an intelligent control device, a butterfly valve, a reducing joint, a companion flange and a user pipeline. The sleeve multi-stage noise reduction regulating valve comprises a valve body. When fluid enters the valve, water flow is preliminarily dispersed through the first noise reduction holes in the outer layer, direct impact of the fluid on the valve body is reduced, noise is lowered, the water flow enters the upper sleeve and then falls onto the inclined buffer baffles, the buffer baffles are arranged in an up-and-down alternate multi-layer mode, and therefore the situation that the water flow vertically falls down and directly flushes the valve body is avoided, and noise is further lowered; and then the water flow passes through the second noise reduction hole in the inner layer, the water flow is further dispersed, direct impact of the fluid on the valve body is reduced again, formation of turbulent flow can be effectively restrained through the first noise reduction hole with the variable diameter, the second noise reduction hole with the variable diameter and the inclined buffering baffle, and therefore noise is reduced.

The invention provides a method and device for optimizing noise of an indoor fan, an air conditioner and a storage medium, operation parameters and scene information of the air conditioner are obtained, a to-be-used rotating speed relation is determined from pre-stored corresponding relations of parameters and rotating speed relations on the basis of the operation parameters, and the to-be-used rotating speed relation comprises the corresponding relation of information and rotating speed; and determining a target rotating speed based on the scene information and the corresponding relation between the information and the rotating speed, and adjusting the rotating speed of the indoor fan based on the target rotating speed to optimize the noise. Through the mode, the corresponding target rotating speed can be determined according to different operating parameters and scene information, so that the noise is optimized, the noise can be reduced under the condition that the structure of the air conditioner does not need to be changed, and the noise reduction effect can be improved.

The invention discloses a low-frequency broadband sound absorption metamaterial structure based on metal foam and a metamaterial sound barrier, the metamaterial structure comprises a metal foam layer and a composite resonant sound cavity layer, and the metal foam layer and the composite resonant sound cavity layer are stacked; the composite resonance sound cavity layer comprises a mother cavity structure and a son cavity structure, the son cavity structure is embedded in the mother cavity structure, and the mother cavity structure and the son cavity structure are both provided with openings facing the metal foam layer, so that incident sound waves can enter the mother cavity structure and the son cavity structure after propagating through the metal foam layer; cavities of the primary cavity structure and the secondary cavity structure are one-way uniform-section cavities. The low-frequency and broadband high-efficiency sound absorption composite material is applied to the field of acoustic noise reduction, achieves low-frequency and broadband high-efficiency sound absorption performance, has high rigidity and strength and excellent environmental adaptability, can bear loads, is good in environmental tolerance and excellent in fireproof performance, is suitable for various complex and severe environments, ensures a long-term stable working state, is convenient to manufacture in batches at low cost, and has wide application prospects. And the economic feasibility is improved.

The utility model provides a charging pile with a noise reduction function, and relates to the technical field of charging piles, a charging module, a cooling fan, an air inlet and an air outlet are arranged in the charging pile, an air inlet channel is arranged between the air inlet and the charging module, and an air outlet channel is arranged between the air outlet and the charging module. The air inlet, the air outlet and the heat dissipation fan are located at different height positions, the air inlet channel and the air outlet channel form a zigzag air channel, noise reduction assemblies are arranged in the air inlet channel and the air outlet channel, under the action of the heat dissipation fan, airflow passes through the zigzag air channel to dissipate heat of the charging module, and under the action of the noise reduction assemblies, noise is reduced. The charging module is located on the upper side in the pile, the system heat dissipation fan is located on the back of the charging module and right faces the charging module, the air inlet and the air outlet are located on the lower side and are far away from a noise source, the air inlet channel and the air outlet channel are internally provided with sound absorption cotton or sound insulation cotton or micropore sound absorption plates, and the noise of the charging pile is effectively reduced while heat dissipation is guaranteed.

The invention discloses a multi-mode marine bearing fault detection method based on acoustic denoising. The method comprises the steps of obtaining marine bearing fault signal data; the marine bearing fault signal data comprises acoustic time sequence data and vibration time sequence data of corresponding bearing faults under different fault working condition types; the method comprises the following steps: constructing a multi-modal marine bearing fault detection model based on acoustic denoising, wherein the model comprises an input layer, a graph construction module, a feature extraction network, an acoustic noise reduction network based on a bidirectional long-short-term memory network, a nearest neighbor interpolation module, a feature fusion network and a classification prediction module; model training is carried out through marine bearing fault signal data to obtain an optimal detection model, and then multi-mode marine bearing fault detection based on acoustic denoising is achieved. According to the method, the problems of poor accuracy, robustness and early warning capability of fault detection under a complex ship working condition due to the fact that an existing method cannot effectively overcome strong noise environment interference of the ship and is insufficient in multi-source information fusion capability are solved.

The invention discloses a bone conduction earphone and a bone conduction earphone system thereof, and relates to the technical field of bone conduction earphones, and the bone conduction earphone and the bone conduction earphone system thereof comprise a power supply module, a sound processing module and a connection module used for being connected with external equipment, the sound processing module comprises an audio input unit for receiving analog or digital audio signals from a microphone or other audio sources, the signal processing unit is used for processing the received audio signals; the vibration transmission unit is used for converting the processed audio signals into vibration signals and transmitting the vibration signals to auditory nerves of a user through skull bones; the signal processing unit comprises a noise reduction algorithm for reducing noise and a sound leakage prevention algorithm for reducing sound leakage of the bone conduction earphone; the noise reduction function and the sound leakage prevention function are achieved through the noise reduction algorithm and the sound leakage prevention algorithm respectively, and the noise reduction performance and the sound leakage prevention performance of the bone conduction earphone are improved.

The utility model discloses a noise reduction assembly applied to a cutting device. In an inner cavity of a cutting platform of the cutting device, a connecting piece is vertically arranged under the position where a cutting assembly carries out cutting action; one end of the connecting piece is connected with the top of the inner cavity, the other end of the connecting piece is pre-buried in the ground, sound waves can be conducted into the ground surface, and the inner cavity is filled with sound absorption cotton; the utility model further discloses a light steel keel cut-off machine, the cutting assembly is arranged on the cutting platform and can move synchronously with the position, to be cut, of the light steel keel, and in the moving process, the light steel keel is cut; the lead screw pair mechanism is arranged on the upper surface of the cutting platform and used for driving the cutting assembly to do reciprocating motion in the moving direction of the light steel keel. The light steel keel structure further comprises the noise reduction assembly, noise generated when the light steel keel is cut off is basically eliminated, the field operation environment is improved, and the harm of the noise is reduced.

To provide an atmospheric water production system which is low in noise, can fully and efficiently utilize energy, reduces energy consumption, and improves practicality. [Solution] The system includes an atmospheric water generating device and a control device, and the control device controls the operation of the atmospheric water generating system. The atmospheric water generating device includes a freshwater generating evaporator 101, a condenser, a compressor 103, a fan 104 and a noise reduction device 105. The condenser is connected to the freshwater generating evaporator 101, and the compressor 103 is connected to the freshwater generating evaporator 101 and the condenser, thereby circulating, cooling and supplying the refrigerant. The noise reduction device 105 is provided between the fan 104 and the compressor 103, and the fan 104 is provided between the condenser and the compressor 103. Air from outside passes through the freshwater generating evaporator 101 to generate water and cold air. After cooling the condenser, the cold air is blown into the noise reduction device 105 to reduce noise.

The invention relates to the technical field of transformers, and discloses a noise reduction type intelligent large dry-type transformer which comprises a base, a sound insulation plate is fixedly connected to the left side of the base, a ventilation door is rotatably connected to the front portion of the sound insulation plate, a buffer spring is fixedly connected to the inner wall of the base, and a supporting frame is fixedly connected to the top of the buffer spring. A transformer body is arranged at the top of the supporting frame, a fixing plate is fixedly connected to the left side of a sound insulation plate, a chamfering plate is fixedly connected to the bottom of the fixing plate, a reciprocating lead screw is rotatably connected to the inner wall of the chamfering plate, and a U-shaped plate is in threaded connection with the circumferential surface of the reciprocating lead screw. And vibration generated in the operation process of the transformer body can be buffered, so that mechanical vibration generated in the operation process of the transformer body can be remarkably reduced, noise is reduced, and the comfort degree of the working environment is improved.

The utility model relates to the technical field of calcium silicate boards, in particular to a calcium silicate board waterproof structure which comprises a structure body, a first calcium silicate board layer is arranged at the top of the structure body, a colored surface is arranged at the bottom of the first calcium silicate board layer, an anti-corrosion layer is arranged in the structure body, a drying layer is arranged in the anti-corrosion layer, and a fireproof frame is arranged in the drying layer. A silencing structure is arranged in the fireproof frame and mainly comprises a silencing layer, a sound transmission hole, a silencing opening, silencing cotton and a silencing medium. Through the arrangement of the sound transmission holes, the silencing openings, the silencing cotton and the silencing medium, noise transmission can be reduced through the silencing layer, external noise is absorbed through the sound transmission holes, the absorbed noise is transmitted to the interior of the sound absorption medium, and the absorbed noise is circularly transmitted and reduced through the silencing holes in the sound absorption medium; and through the silencing cotton, the transmission of noise can be reduced, the volume of the noise is effectively reduced, and the sound insulation effect of the sound reduction layer is ensured.

The utility model relates to the technical field of ball mills, and particularly discloses a ball mill sound insulation and noise reduction device which comprises a bottom plate, a supporting seat is installed in the middle of the outer wall of the top of the bottom plate, an outer shell is arranged on the outer wall of the top of the supporting seat, and strip-shaped grooves are formed in the positions, close to the two ends, of one side of the outer wall of the top of the bottom plate; the machine box is installed on the side, away from the strip-shaped groove, of the outer wall of the top of the bottom plate, a driving mechanism is arranged in the machine box, one end of the driving mechanism is connected with the outer shell, and sound absorption cotton is installed at the position, close to the driving end of the driving mechanism, of the inner wall of the machine box; the two moving mechanisms are mounted on the inner walls of the two strip-shaped grooves correspondingly; noise is absorbed and reduced through the sound absorption cotton, heat dissipation in the case is enhanced through the heat dissipation net, the heat dissipation plate and the fan, the motor is prevented from being in a high-temperature state, and therefore the noise generated when the motor works is reduced.

The utility model relates to a sound insulation and noise reduction aluminum alloy window, which belongs to the technical field of aluminum alloy windows and comprises an aluminum alloy frame and two aluminum alloy window bodies. A plurality of springs are arranged on the upper portion in the aluminum alloy frame, the upper ends of the springs are fixed in the aluminum alloy frame, the lower ends of the springs are fixedly connected with a supporting plate, and the lower end of the supporting plate is connected with a sliding rail used for fixing the aluminum alloy window body and enabling the upper portion of the aluminum alloy window body to slide. An arc-shaped sliding groove matched with the aluminum alloy window body is formed in the lower portion of the interior of the aluminum alloy frame. Sliding grooves matched with the sliding rails are formed in the top end of the aluminum alloy window body, and a plurality of steel ball rollers are fixedly mounted at the bottom end of the aluminum alloy window body; a telescopic first sound insulation cotton strip is arranged in the inner window body at the joint of the two aluminum alloy window bodies. The aluminum alloy window body can be conveniently installed in the aluminum alloy frame through the telescopic effect of the spring, the sliding rail is tightly attached to the sliding groove of the aluminum alloy window body through the gravity effect of the supporting plate and the sliding rail, and the influence of noise on residents is reduced.

This invention discloses a low-noise range hood, including a range hood body and a fan housing mounted on the range hood body. A sound-absorbing volute is fixedly installed inside the fan housing. The sound-absorbing volute includes a volute body and a damping layer on the inner wall of the volute body. Multiple baffles are mounted on the volute body, and these baffles are rotatably connected to the volute body via connecting components. A noise-reducing plate is installed inside the fan housing. An exhaust pipe is connected to the exhaust vent extending from the volute body to the outside of the fan housing. An oil fume filter plate is installed inside the exhaust pipe. This invention discloses a low-noise range hood that reduces noise while also filtering oil fumes.

The utility model relates to the technical field of nitrogen making machine noise reduction, and discloses a nitrogen making machine noise reduction device which comprises a nitrogen making machine body, the input end of the nitrogen making machine body is communicated with an air inlet pipe, the output end of the nitrogen making machine body is communicated with an air outlet pipe, shells are arranged on the two sides of the upper end of the nitrogen making machine body, and lead screws are arranged at the lower ends of one sides of the shells. According to the technical scheme, the shell can be separated from the air inlet pipe and the air outlet pipe, so that the pipe valves of the air inlet pipe and the air outlet pipe can be conveniently maintained, after maintenance is completed, the shell can cover and isolate the pipe valves of the air inlet pipe and the air outlet pipe, noise discharge is reduced, meanwhile, the first noise reduction sponge is matched with the mesh plate, and noise is reduced. And in the shell moving process, the expansion air bag is expanded to push the second noise reduction sponge to be attached to the outer side wall of the air inlet pipe or the air outlet pipe, dissipation and discharge of the noise are further reduced, and therefore the noise reduction effect on the nitrogen making machine body is achieved.

The invention discloses a noise reduction and impact resistance gear structure and a transmission device. The noise reduction and impact resistance gear structure comprises a gear body, a buffering assembly and a noise reduction assembly, wherein the buffering assembly and the noise reduction assembly are arranged in the gear body; the buffering assembly is arranged in the gear body, and the noise reduction assembly comprises sound absorption cotton and is mounted in mounting grooves separated by the fixing frame. The gear box has remarkable noise reduction and impact resistance and can effectively protect gears. And the lubricating device in the gear box can accurately spray oil to provide continuous lubrication for the gear. In the operation process of the gear, the sound absorption cotton can absorb part of sound waves, and noise transmission is remarkably reduced. When the gear is subjected to large impact force, the gear body drives the fixing frame to extrude the telescopic rod, the whole gear body eccentrically moves, and therefore the impact force is dispersed, after the impact force disappears, the movable spring and the sliding spring release energy, the gear body is pushed to recover to the initial state, the service life of the gear is remarkably prolonged, and the operation stability of the gear is remarkably improved.

The invention belongs to the technical field of ventilation, and discloses a vehicle body acoustic superstructure noise reduction ventilation frame which comprises a ventilation frame body and an acoustic superstructure. The ventilation frame comprises a ventilation frame body and blades rotationally connected to the ventilation frame body, the ventilation frame body is provided with a pressure relief channel, and the blades can open or close the pressure relief channel under the action of external force; an acoustic superstructure body of the acoustic superstructure is fixedly connected to the ventilation frame body, the acoustic superstructure body is provided with a communicating channel communicating with the pressure relief channel, and at least two acoustic noise reduction cavities are formed in the inner circumferential wall of the communicating channel in a concave mode and distributed in the circumferential direction of the communicating channel at intervals. By the adoption of the vehicle body acoustic superstructure noise reduction ventilation frame, in the vehicle outer circulation process, on the basis that the ventilation and pressure relief efficiency of the ventilation frame is not affected, the intensity of noise transmitted into a vehicle cab can be effectively weakened, and therefore the riding experience of people in a vehicle can be effectively improved.

The invention relates to the technical field of heating construction, in particular to a pipeline splicing device for house building water heating construction, which comprises a bottom plate, a plurality of moving wheels are arranged at the bottom of the bottom plate, the plurality of moving wheels are used for moving the splicing device, and a sealing sound insulation assembly is arranged at the top of the bottom plate; the sealing sound insulation assembly is used for isolating smoke and noise and comprises a fixing frame, wave sound insulation plates are arranged on the two sides of the fixing frame, transparent sound insulation plates are slidably connected to the front side and the rear side of the fixing frame, a top plate is arranged at the top of the fixing frame, and the two wave sound insulation plates, the transparent sound insulation plates, the top plate and the fixing frame form a sealing cavity. By means of the sealing cavity, smoke generated by welding and cutting is effectively prevented from diffusing, outward transmission of noise is reduced, the risk that constructors inhale harmful gas is reduced, noise transmission is greatly reduced, a relatively quiet working environment is created for the constructors, meanwhile, noise interference to surrounding personnel is avoided, and harm to the environment and the personnel is reduced.

1. The name of this design product: sound-absorbing panel. 2. Purpose of this design product: used for sound insulation, to isolate sound and reduce noise. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1.

The invention discloses an ultra-wide-band noise reduction and bearing function integrated metamaterial structure sound barrier. The ultra-wide-band noise reduction and bearing function integrated metamaterial structure sound barrier comprises a multifunctional integrated screen body and a porous metamaterial sound absorber. The multifunctional integrated screen body comprises a composite non-uniform hollowed-out plate and a cavity, the composite non-uniform hollowed-out plate is arranged at the open end of the cavity, and partition plates are arranged in the cavity to divide the cavity into a plurality of sub-cavities; the porous super-structure sound absorber comprises a plurality of high-porosity sound absorption media arranged in the corresponding sub-cavities, and sound wave regulation and control channels are formed in the high-porosity sound absorption media. The metamaterial structure sound barrier is applied to the field of acoustic noise reduction, the metamaterial structure sound barrier can obtain low-frequency and ultra-wide-band efficient sound absorption performance, the overall rigidity of the sound barrier is improved, the longitudinal supporting area of the sound barrier is increased, the ultra-wide-band sound insulation performance of the sound barrier is greatly improved, meanwhile, the bearing capacity of a sound barrier body is greatly improved, and the noise reduction effect is good. The integration of the ultra-wideband efficient noise reduction performance and the high bearing function of the sound barrier with the metamaterial structure is realized.

The invention discloses a refrigerator and a noise reduction method thereof.The refrigerator comprises a refrigerator body, a refrigerating system, a sound pressure sensor, a loudspeaker and a controller, and the refrigerating system is arranged in the refrigerator body and comprises a compressor, a condenser, an evaporator and a fan; the sound pressure sensor is arranged at a preset position outside the box body and is used for detecting sound pressure at the preset position; the loudspeaker is arranged on the box body and is used for playing masking sound to reduce noise; the controller is configured to acquire sound pressure data, detected by the sound pressure sensor, at a preset position during the automatic door opening and closing operation period of the refrigerator; and analyzing the sound pressure data, generating a target masking sound according to a frequency band where a sound pressure maximum value is located, and controlling the loudspeaker to play the target masking sound. The environment sound pressure data is considered based on the sound masking technology, the masking sound is generated according to the frequency band where the maximum value of the environment sound pressure is located for sound masking, and therefore noise generated when the door of the refrigerator is automatically opened and closed is reduced, and user experience is effectively improved.

The invention discloses a silencer, a silencer assembly and a server, which are applied to the technical field of silencer structures and used for solving the problem that noise affects the performance of a mechanical hard disk, and the silencer comprises a shell which comprises a first cylinder body and a hollow cylinder bottom arranged at one end of the first cylinder body; the inner shell comprises a second barrel and a sound cavity wall arranged on the periphery of the second barrel, and a through hole penetrating through the wall thickness of the second barrel is formed in the second barrel; the base is connected with at least one of the first barrel and the second barrel and located at the end, away from the barrel bottom, of the silencer; the inner shell is arranged in the outer shell, the end, away from the cylinder bottom, of the outer shell is connected with the inner shell, the sound cavity wall is attached to the inner wall of the outer shell, and a noise reduction cavity is formed in the space between the inner shell and the outer shell. Noise generated by rotation of the fan enters the noise reduction cavity through the inner hole of the inner shell to be consumed, the noise of the fan can be optimized through the silencer, and the influence of the noise on the performance of the mechanical hard disk is reduced.

The utility model belongs to the technical field of variable-frequency speed regulators, in particular to an explosion-proof variable-frequency speed regulator, which comprises a variable-frequency speed regulator box body and an energy absorption mechanism, a heat dissipation fan is mounted at the top end of the variable-frequency speed regulator box body, and the energy absorption mechanism is mounted at a position corresponding to a heat dissipation hole in the variable-frequency speed regulator box body. The energy absorption mechanism comprises a buffer plate which is elastically installed at the position, corresponding to the heat dissipation holes, of the inner side face of the variable-frequency speed regulator box body, and a gap is formed between the buffer plate and the inner side face of the variable-frequency speed regulator box body. The noise reduction sponge is fixed on the buffer plate; according to the variable-frequency governor box body, through the arranged energy absorption mechanism, kinetic energy of a part of airflow can be absorbed, shaking of the variable-frequency governor box body caused by too large airflow is avoided, noise can be effectively reduced, meanwhile, the safety of the variable-frequency governor box body is improved, and meanwhile, the noise reduction sponge can also absorb most noise sound waves and reduce noise.

According to the blade of the oblique flow fan, the front end of an impeller ring is composed of an outer impeller ring and an inner impeller ring, and the blade comprises a blade tip jet flow noise reduction structure and a blade root pressure stabilizing noise reduction structure; the blade tip jet flow noise reduction structure comprises an impeller ring front end jet flow structure and an impeller ring rear end noise reduction structure. The blade root pressure stabilizing and noise reducing structure comprises a blade front edge noise reducing structure and a hub middle pressure stabilizing structure. As the blade structure of the oblique flow fan is improved, the flow characteristic is improved, the noise is reduced, and the conveying efficiency is improved.

The utility model relates to the technical field of hair driers, in particular to a hair drier capable of reducing use noise through a conical sound absorption structure. Comprising a blower body with an air inlet and an air outlet, a fluid channel which enters the air outlet along the air inlet and flows out is arranged in the blower body, a high-speed fan and a heating module are arranged in the fluid channel, the heating module is arranged at the air outlet and the high-speed fan, and a conical inner shell is arranged in the fluid channel. The end, with a small opening, of the conical inner shell is in butt joint with the air inlet, the end, with a large opening, of the conical inner shell is in butt joint with the high-speed fan, a plurality of evenly-distributed long holes are formed in the wall face of the conical inner shell in a surrounding mode, a sound absorption cavity is formed between the conical inner shell and the inner wall of the blower body, and a sound absorption layer is arranged in the sound absorption cavity. And the sound absorption layer arranged in the sound absorption cavity can play a powerful sound absorption role. When sound waves generated when the blower works enter the sound absorption cavity through the long holes, the sound absorption layer can efficiently absorb and convert sound wave energy, and therefore noise transmission is greatly reduced.

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 discloses an auxiliary tool for manually attaching mute sponge. The auxiliary tool comprises a fan-shaped guide groove, a guide rod, a handle, a first buckle, a lead screw, a supporting rod, a fixing base and a fixing screw. By adopting the auxiliary tool, the situation that the center position of the tire crown cannot be found by manually attaching the mute sponge can be avoided, and the mute sponge is prevented from being attached to one side or snakelike. In addition, no matter how the width of the sponge changes, the lead screw can be adjusted to advance or retreat to ensure the width of the mute sponge, it is ensured that the mute sponge is attached to the center of the tire crown, the noise reduction performance is achieved, and the guiding function is mainly achieved.

The utility model relates to the technical field of noise reduction, in particular to a noise reduction device capable of reducing noise between equipment, which comprises pump body equipment and an equipment room for installing the pump body equipment, a base for supporting the pump body equipment is fixedly arranged at the bottom of the equipment room, and right-angle grooves consisting of vertical square grooves and horizontal round holes are arranged on two sides of the base. And right-angle bent pipes are pre-buried in the vertical square grooves, pipelines at the two ends of the pump body equipment communicate with the input ends of the right-angle bent pipes on the two sides correspondingly, the output ends of the right-angle bent pipes communicate with horizontal pipes, and a noise reduction compartment is fixedly arranged on the surface of the top of the base. According to the technical scheme, the right-angle bent pipe is pre-buried, so that the requirement for laying inlet and outlet pipes of pump body equipment is met without punching holes in the noise reduction compartment, punching holes in the noise reduction compartment are reduced, the noise reduction effect is improved, the upper layer of the base is the rubber layer, vibration of the pump body equipment can be reduced, noise is reduced from the source, and the noise reduction compartment is matched. And the equipment noise transmitted from the equipment room can be reduced.

The invention discloses a noise reduction type disrotatory fog gun, and relates to the technical field of environmental protection. The noise reduction type contra-rotating fog gun comprises an air guide barrel, a first sound absorption barrel, a contra-rotating air outlet device and a spraying device. The first sound absorption cylinder is arranged in the air guide cylinder, a first sound absorption cavity is formed between the first sound absorption cylinder and the air guide cylinder, a plurality of first sound absorption holes are densely formed in the first sound absorption cylinder, the first sound absorption holes communicate with the first sound absorption cavity, the contra-rotating air outlet device is installed in the first sound absorption cylinder, and the spraying device is installed at the air outlet end of the air guide cylinder; the contra-rotating air outlet device comprises a driving part, a first impeller, a reverse transmission assembly and a second impeller, the driving part is connected with the first impeller, the reverse transmission assembly is connected between the first impeller and the second impeller, and the first impeller and the second impeller are coaxially arranged. According to the noise reduction type disrotatory fog gun, long-distance water mist blowing can be achieved, the operation requirements of different scenes are met, noise can be effectively reduced, and noise pollution is relieved.