14results 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 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 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 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 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.