22results about How to "Improve noise reduction efficiency" patented technology

The utility model discloses a central air conditioning pipeline noise reduction assembly, including central air conditioning ventilation pipeline, the inside of central air conditioning ventilation pipeline is provided with central air conditioning ventilation pipeline, the inside of central air conditioning ventilation pipeline is provided with noise reduction assembly no.

The utility model discloses a charging pile with a noise reduction function, which comprises a charging pile body, a second motor arranged in the charging pile body and used for heat dissipation, two shock pads mounted at the bottom of the inner side of the charging pile body, fixing blocks fixedly mounted above the two shock pads, and a first damper fixedly mounted between the two fixing blocks. The outer surface of the first damper is fixedly sleeved with a baffle, the two sides of the baffle are each provided with a first spring arranged on the first damper in a sleeving mode, the other end of each first spring is connected with a sliding block movably connected to the first damper in a sleeving mode, a connecting rod is hinged to the upper portion of each sliding block, and a top plate used for supporting the second motor is hinged to the end, away from a hinge block, of each connecting rod. A second damper is fixedly installed above the fixing block, the bottom of the second damper is connected with the bottom of the top plate, and a second spring arranged on the second damper in a sleeving mode is connected between the top plate and the fixing block. And vibration generated by the first spring, the first damper, the second damper and the second spring to the second motor is weakened, and the noise reduction efficiency is improved.

The invention belongs to the field of data processing, and discloses a precision marketing analysis system based on big data, which comprises an analysis terminal and an identity recognition terminal, the analysis terminal is used for acquiring a face image of an analyst and transmitting the face image to the identity recognition terminal; the identity recognition terminal comprises a noise reduction module and a recognition module; the noise reduction module is used for carrying out noise reduction on the face image to obtain a to-be-recognized image; the recognition module is used for recognizing the to-be-recognized image and judging whether the face recognition of the analyst is successful or not. According to the method, the noise reduction efficiency is higher, and compared with the first noise reduction mode adopted for all the pixel points, the edge information can be more effectively reserved. Therefore, the overall noise reduction time can be effectively shortened and the noise reduction efficiency is improved while the noise reduction effect is ensured, so that the customer type determination efficiency is improved and the marketing efficiency is improved.

The utility model discloses a noise reduction mechanism for construction of an ultra-wide steel box girder, which belongs to the field of noise reduction mechanisms and comprises a mounting block, a plurality of bolts are in threaded connection with the side wall of the mounting block, a limiting plate is mounted at the upper end of the mounting block, and a butt joint pipe is slidably connected with the upper end of the limiting plate. The limiting plate and the butt-joint pipe are in threaded connection with a threaded rod, the end, extending out of the butt-joint pipe, of the threaded rod is in threaded connection with a butt-joint cover, the side wall of the butt-joint cover is sleeved with a protective pad and sound absorption cotton which are distributed in an array mode, and a drainage hole is formed in the lower end of the butt-joint cover. Therefore, noise can be conveniently adsorbed and rebounded, the noise reduction efficiency is improved, meanwhile, the butt joint cover and the limiting plate can be conveniently disassembled, mounting and dismounting are convenient, and the device is simple in structure and low in manufacturing cost.

The range hood comprises a shell, a fan and a control assembly which are arranged in the shell, and an exhaust fume collecting hood arranged at the bottom of the shell, the fan is vertically arranged in the shell, a fume inlet of the fan is opposite to the inner wall of the rear side of the shell, a fume guide cavity is formed between the fan and the inner wall of the rear side of the shell, and the noise reduction guide plate is obliquely arranged on the upper portion of the fume guide cavity. The upper end of the noise reduction flow guide plate is located above the smoke inlet and fixedly connected with the top wall of the machine shell, and the lower end of the noise reduction flow guide plate is opposite to the smoke inlet and connected with the rear side wall of the machine shell in a clamped mode. Compared with the prior art, the range hood provided with the noise reduction flow guide plate has the advantages that the upper end of the noise reduction flow guide plate is connected with the top wall through the two screws, so that the noise reduction flow guide plate can bear direct impact of airflow without deformation or vibration, and secondary noise is avoided; the lower end of the noise reduction flow guide plate is clamped with the rear side wall of the machine shell, the placement angle of the noise reduction flow guide plate can be limited through clamping matching, and the installation precision of the noise reduction flow guide plate is guaranteed.

The utility model relates to a new car roof structure for medium -high speed elevator, aims at the demand of reducing elevator shaft pit depth. Including car roof welding spare (1), perforated plate (2), sound insulation material (3) and car roof sealing plate (4), its car roof welding spare (1) as core bearing matrix, adopts the design of grid reinforcing rib, and the reinforcing rib height is 20 50mm, and the interval is 200 400mm, the perforated plate (2) is laid on the upper portion of car roof welding spare (1), is fixed through the drill tail silk, the sound insulation material (3) selects polyurethane foam or glass fiber cotton thickness 10 30mm, the car roof sealing plate (4) adopts galvanized steel sheet or stainless steel sheet, and the edge sets up the bending structure, the utility model not only guarantees the strength and rigidity of elevator car bottom, also effectively improved the security and operation effect of overall structure, is applicable to the elevator equipment that needs shallow pit installation.

The utility model relates to muffler technical field, concretely is a kind of muffler device for gasoline engine, including muffler shell, air inlet pipe and exhaust pipe, muffler shell is equipped with baffle one and baffle two, and the shell is divided into first chamber, second chamber and third chamber, the top end of air inlet pipe is elbow and is located in second chamber;Baffle one and baffle two are equipped with the connecting pipe between first chamber and third chamber, exhaust pipe penetrates baffle one, baffle two and the top of muffler shell, so that first chamber is connected with the outside space of muffler shell.Its advantages are: first, it is equipped with three chambers, gas is discharged from second chamber, then passes through third chamber and first chamber, and finally discharged from exhaust pipe, due to the change of airflow by three chambers and the increase of resonance time of gas between chambers, noise is reduced;Second, exhaust pipe is equipped with sound-absorbing cotton, and honeycomb board is further equipped between exhaust pipe and connecting pipe, which greatly reduces noise and improves sound-absorbing efficiency.

The present invention provides an exhaust silencer mechanism for an all-terrain vehicle, which belongs to the field of automobile manufacturing technology. It solves the technical problems that the airflow flow path of the existing exhaust silencer is a simple straight line, resulting in a single airflow movement route during the exhaust process and poor noise reduction effect. The exhaust silencer mechanism of the all-terrain vehicle includes an exhaust manifold body, and the bottom of the exhaust manifold body is sequentially provided with a corrugated short pipe, a three-way catalytic converter body, and a diverter pipe. Two corrugated long pipes are fixed at the bottom of the diverter pipe, and the bottoms of the two corrugated long pipes are respectively provided with silencers. The silencers include exhaust pipes that are respectively fixedly connected to the bottom ends of the two corrugated long pipes, and the inner wall of the exhaust pipe is fixed with a reflection wall, and the reflection wall is made of HT500C acoustic material. Three partitions are sequentially fixed on the upper and lower inner walls of the exhaust pipe. The present invention has the advantages of realizing diversion and reflection to weaken noise and improve silencer efficiency, and the installation position of the exhaust pipe is suitable for more models of all-terrain vehicles.

A fan motor (100) includes: a rotor (10) disposed in a shaft (30) and formed by insert injection molding, the rotor (10) rotating together with the shaft (30); a stator (20) mounted in the direction of the rotor (10); an upper insulator (21) constituting the stator (20), the upper and lower insulators (21, 23) being coupled to the upper and lower parts of the core (22) of the stator (20); a motor holder (60) coupling the upper and lower insulators (21, 23) and the printed circuit board (50); and a rotor separation prevention and damping device (80) installed on a recessed annular groove (31) at the lower end of a shaft (30), the shaft (30) being inserted into a sleeve bearing (40), the sleeve bearing (40) being installed inside an installation protrusion (61) protruding from the center of the motor support (60).

The utility model relates to refrigerating machine technical field discloses a kind of muffler for refrigerating machine, comprising: sound-absorbing shell, and the air inlet pipe and air outlet pipe for air flow in and out, the sound-absorbing shell top is equipped with the sound-absorbing cover body for air outlet pipe installation;Through the cooperation between sound-absorbing shell, sound-absorbing cover body and multistage sound-absorbing mechanism, through the setting of the outer diameter and the aperture of first sound-absorbing disc, second sound-absorbing disc and third sound-absorbing disc gradually decrease from top to bottom, can make airflow when flowing through multistage sound-absorbing mechanism, constantly change flow direction and speed, under the blocking effect of first sound-absorbing disc, second sound-absorbing disc and third sound-absorbing disc, sound wave energy is weakened multiple times, simultaneously, increase the contact area and contact time of airflow and multistage sound-absorbing mechanism, further improve sound-absorbing efficiency, effectively reduce the noise generated in the operation process of refrigerating machine, create quiet environment for equipment stable operation.

The utility model discloses a nitrogen making machine structure capable of reducing noise, which comprises a base, a case arranged at the top end of the base, a plurality of uniformly distributed rollers arranged at the bottom end of the base, a case door arranged on one side of the case, a push rod arranged on one side, adjacent to the case door, of the case, and a nitrogen making unit arranged in the case, a sound insulation plate is arranged on the inner wall of the case. The device has the beneficial effects that by arranging the damping assembly, when the device runs, damping can be conducted on the machine box, noise caused by vibration of the machine box is reduced, the noise reduction efficiency is improved, meanwhile, damping protection can be conducted on devices in the machine box through the damping assembly, the situation that the devices are damaged due to too large vibration amplitude is prevented, and the safety of the device is improved.

The utility model provides a composite muffler, including exhaust pipe group, connecting member, spouting cylinder group, resistive muffler, exhaust pipe group through connecting member intercommunication with spouting cylinder group, spouting cylinder group is provided the inlet side of resistive muffler, the exhaust pipe group is provided with a plurality of groups, spouting cylinder group is provided with a plurality of groups, the spouting cylinder group is provided with a plurality of groups, the spouting cylinder group is provided with a plurality of groups, the spouting cylinder group is provided with a plurality of groups, and the resistive muffler is provided with a plurality of groups. Each injection cylinder group is provided with a large-hole throttling pressure-reducing injection cylinder and / or a small-hole injection cylinder, and a single injection cylinder group is at least connected with one exhaust pipe group; a plurality of injection barrel sets are connected with one resistive silencer, the silencing capacity of the resistive silencer is superposed, and the total silencing capacity of 35-60 dBA can be achieved.

The utility model relates to the technical field of gas turbine power generation, in particular to gas turbine combined cycle power generation low-noise emission equipment which comprises a sound absorption box body, a box door is hinged to one side of the sound absorption box body, and through holes are formed in the two faces of the sound absorption box body respectively. The silencing box body is arranged in the sound absorption box body, an air inlet is formed in one side of the silencing box body, an air outlet is formed in the other side of the silencing box body, and the air inlet and the air outlet are matched with the through holes in the two faces of the sound absorption box body respectively. Compared with the prior art, by arranging the silencing box body, the multistage serially-connected silencing cavities and the complex airflow path, stage-by-stage attenuation, disturbance and dissipation of sound waves are effectively achieved, linear propagation and high-frequency impact of noise are avoided, the noise reduction efficiency is improved, and the noise pollution risk of the system is reduced.

The air draft system with the noise reduction function comprises a noise reduction pipe body, an inner pipe body is connected in the noise reduction pipe body in a sleeved mode, the right side of the inner pipe body is closed, the right side of the noise reduction pipe body is connected with a noise reduction cover through a bolt, the left side of the noise reduction cover is open, and the right side of the noise reduction cover is connected with a fan. An exhaust fan is connected into the silencing cover through bolts, a funnel pipe is connected between the top and the bottom of an inner cavity of the inner pipe body, an air guide opening is formed in the left side of the funnel pipe, mounting grooves are formed in the tops and the bottoms of the inner cavities of the silencing pipe body and the inner pipe body correspondingly, and the right sides of the mounting grooves communicate with air guide grooves. And the right side of the air guide groove is communicated and connected with the interior of the silencing cover. According to the technical scheme, the silencing pipe body, the silencer, the buffer spring, the piston piece, the air guide groove and other components are matched with one another, so that effective shunting can be carried out, air can be dispersed and guided out, vibration can be effectively reduced, effective silencing can be carried out, and the silencing efficiency of the silencer is improved.

The utility model relates to the field of damping rubber sheet, specifically disclose a damping rubber sheet for car, including damping rubber sheet main part, damping rubber sheet main part includes from top to bottom sequentially arranged corrosion -resistant protective layer, reinforcing layer, double damping layer, magnetic composite layer, first adhesive layer, double damping layer includes laminated arrangement and close reinforcing layer's upper damping layer, far away reinforcing layer's lower damping layer, the upper damping layer, lower damping layer all are provided with a plurality of sound absorption holes, the porosity of upper damping layer is greater than the porosity of lower damping layer. Double damping layer can carry out graded absorption and processing to the noise of different frequency, and the larger porosity of upper damping layer is favorable to absorb middle high frequency noise, and the smaller porosity of lower damping layer has better absorption effect to low frequency noise, thereby can effectively widen the noise reduction frequency band of this damping rubber sheet, significantly improve the overall noise reduction performance, can effectively reduce various noises in the car, create a quiet and comfortable in-car environment for the driver and passenger.

The utility model relates to the technical field of oxygen generator spare and accessory parts, and discloses a medical PSA oxygen generator mute type nitrogen removal silencer which comprises a shell, a fixing frame is fixedly connected to the inner wall of the shell, a ventilation net is fixedly connected to the inner wall of the fixing frame, a threaded pipe is arranged on the outer wall of the ventilation net in a sleeved mode, a plurality of ventilation nets are arranged in the threaded pipe, and the ventilation nets are arranged in the threaded pipe. The inner wall of the shell is provided with silencing cotton, the inner wall of the shell is slidably connected with an air inlet pipe, the interior of the air inlet pipe is fixedly connected with connecting pipes which are in bilateral symmetry, the two connecting pipes cover the outer wall of the threaded pipe, the outer wall of the air inlet pipe is fixedly connected with a top cover, and the outer wall of the top cover is provided with a clamping assembly. According to the silencer, through cooperation of the shell, the fixing frame, the ventilation net, the threaded pipe, the ventilation net, the silencing cotton, the air inlet pipe, the connecting pipe, the top cover and the clamping assembly, the rapid and efficient silencing effect is achieved, and the silencing efficiency is improved.

The utility model provides modular assembly type road sound insulation screen frame relates to road sound insulation screen technical field, including bottom plate, the four corner of bottom plate installs the positioning pin, the top of bottom plate installs lower mounting seat, the both sides inside lower mounting seat installs lower cross bar, the top inside lower mounting seat installs vertical pole, the top of vertical pole installs upper mounting seat, the both sides inside upper mounting seat installs upper cross bar, the inside of lower mounting seat is provided with connecting mechanism, through being provided with connecting mechanism in the inside of lower mounting seat, the mutual match between the positioning hole, the locating piece, the screw groove, the threaded rod and the rotating block of utilizing connecting mechanism, can carry out convenient disassembly and installation handling to vertical pole, can realize module standardization quick butt joint, need not complex procedure, greatly shorten single section assembly time, can replace module alone in local damage, reduce maintenance cost, also promote transportation space utilization, save engineering cost.

The utility model relates to the technical field of building ventilation systems, in particular to a noise reduction structure of a fresh air system pipeline. The utility model provides a fresh air system pipeline noise reduction structure which comprises a pipeline body and a noise reduction assembly, the noise reduction assembly comprises a plurality of noise reduction units arranged at intervals in the axial direction of the pipeline body, and each noise reduction unit is composed of a supporting frame, a porous sound absorption layer, a resonant cavity array and a flow guide cone. The supporting frame is the same as the inner wall of the pipeline body in shape and is fixed to the inner wall of the pipeline body, the porous sound absorption layer is attached to the inner side of the supporting frame, the resonant cavity arrays are located on the two sides of the porous sound absorption layer, and corresponding clamping grooves are formed in the positions, located on the porous sound absorption layer, of the supporting frame. The two ends of the resonant cavity array are fixed to the clamping grooves of the adjacent supporting frames respectively, the flow guide cone is located in the center area of the porous sound absorption layer, and the cone top of the flow guide cone points to the airflow direction.

The application belongs to the field of variable frequency range hood, and discloses a noise reduction method and device. The method comprises the following steps: acquiring the current torque and the current rotating speed of a motor in a range hood; inputting the current torque and the current rotating speed into a pre-trained noise identification model to output a first noise identification result; if the first noise identification result is 0, outputting a noise prompt message to enable a user to adjust the torque and the rotating speed of the motor; and the first noise identification result being 0 indicates that the noise generated by the motor based on the current torque and the current rotating speed is greater than a preset noise threshold. The application can achieve noise reduction without structural changes.

The utility model relates to a mute centrifugal fan, and belongs to the technical field of fans, the mute centrifugal fan comprises a fan shell, an air inlet cover is arranged at an air inlet of the fan shell, the air inlet cover is of a cavity structure and is filled with a sound absorbing material, and a plurality of first through holes allowing sound waves to enter the air inlet cover are formed in the air inlet cover; the air inlet cover is used for covering the air inlet so as to limit the path, perpendicular to the air inlet, of sound waves and airflow, the air inlet of the fan shell is provided with an annular sleeve along the inner wall of the air inlet, the annular sleeve is provided with a first mounting groove used for being filled with sound absorption materials along the circumferential face of the annular sleeve, and the annular sleeve is provided with a first sealing plate used for covering a notch of the first mounting groove along the circumferential face of the annular sleeve. The first sealing plate is provided with a plurality of second through holes allowing sound waves to enter the first mounting groove, the peripheral face of the air inlet cover and the first sealing plate jointly define an air inlet space, and the sound waves can be reflected between the peripheral face of the air inlet cover and the first sealing plate in a reciprocating mode. The sound energy attenuation efficiency is improved, and then the noise reduction effect is improved.

The utility model relates to the technical field of noise reduction, in particular to a hub and a vehicle, the hub comprises a hub body, and a mounting surface is arranged on the peripheral side of the hub body; the noise reduction unit is arranged on the mounting surface, an incidence channel is formed in the side, away from the mounting surface, of the noise reduction unit, and the noise reduction unit carries out noise reduction through sound waves emitted by the incidence channel. According to the hub, the noise reduction unit is arranged on the mounting surface of the hub body, the incidence channel of the noise reduction unit is located on the side, away from the mounting surface, of the noise reduction unit and is directly exposed to the periphery of the hub, and after a tire is mounted on the hub, the incidence channel directly faces the direction of the tire and is used for reducing noise; in the noise reduction process, noise sound waves generated by the tire can directly enter the noise reduction units through the incidence channels for noise reduction, interaction between the noise sound waves and the noise reduction units is better facilitated, and the noise reduction efficiency is higher.