144results about How to "Play a noise reduction effect" patented technology

The invention provides compound modified asphalt concrete which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 3-7 parts of asphalt, 0.05-0.15 part of chlorinated polyethylene, 0.2-1.5 parts of aliphatic polyurethane resin, 0.075-1 part of serpentine, 0.15-1.5 parts of halloysite and 0.001-0.04 part of a coupling agent. The compound modified asphalt concrete provided by the invention is remarkably improved in noise reduction coefficient, has excellent pavement performance, is simple in preparation technology, has non-poisonous and harmless raw materials and has great social benefits for improving the pavement performance of asphalt and protecting the environment.

The invention discloses an automobile seat sliding rail lubrication grease. The lubrication grease is prepared from the following components in percentage by weight: 52%-65% of base oil, 26%-33% of sulfonate, 6%-10% of a structure improving agent and 3%-5% of a thickening agent. The lubrication grease adopts food-grade base oil, is free of smell, free of damage to human body and excellent in high-and-low temperature performance, and can meet the application of an automobile seat sliding rail in extreme environment; the high-alkali synthetic calcium sulphonate has excellent extreme-pressure antiwear property and is free of damage to human body; the effects of resisting wearing, reducing friction and reducing noise can be achieved by not adding high-cost solid lubricant; the structure improving agent is capable of effectively improving the thickening capability of the product and shortening the production time; the thickening agent is capable of greatly improving the antiwear property and the antifriction property of the product and also has excellent pumpability; the raw materials are cheap and easily available; the preparation method is simple and easily controllable; the production efficiency of the product is greatly improved.

The invention discloses a test bed for electromechanical automatic simulation. The test bed comprises lifting sleeves, a workbench and a storage drawer, a support rod is connected above each lifting sleeve, a fixing screw is connected to the outer side of each lifting sleeve, a moving wheel is arranged below each lifting sleeve, a storage plate is mounted among the lifting sleeves, the workbench is located above the lifting sleeves, the storage drawer is connected with fixed slide rails through connecting sliders on two sides, strong magnetic strips are fixed inside the storage drawer, a containing plate is arranged below the storage drawer, handles are connected below the containing plate, and the handles are connected with storage plates through connecting shafts above. The test bed has the advantages that the height of the whole test bed can be regulated conveniently by the lifting sleeves and support rods arranged below the test bed, the strong magnetic strips in the storage drawer can magnetically attract some fine precise parts, and part losing can be avoided effectively.

A high-efficiency low-noise axial flow fan mainly solves the technical problems that an existing axial flow fan is low in efficiency, high in noise and the like. According to the technical scheme, the high-efficiency low-noise axial flow fan is characterized by comprising a main fan body (2), a radial annular inlet (outlet) air muffler device (1) and a muffling diffusion cylinder (4), wherein the two ends of the main fan body (2) are connected with the radial annular inlet (outlet) air muffler device (1) and the muffling diffusion cylinder (4) respectively. A cylindrical housing (209) of the main fan body (2) and a motor housing (215) form an airflow passage. The inner wall of the motor shell (215) is provided with an axial rib plate or a fan-shaped block to support a stator (205). The outer diameter of the motor housing (215) is consistent with the diameter of a hub of an impeller (216), the diameter of an inner cylinder of a front muffler and the diameter of an inner cylinder of a rear muffler. The two ends of the motor housing (215) are basically flush with one end of a main fan body housing. A flange fixing a rotator and an end cover are arranged on the inner side of the motor housing (215). Accordingly, resistance loss is reduced. An air inlet (outlet) flow passage is designed to be of a gradual-shrinkage structure and a gradual-expansion structure, so aerodynamic performance and efficiency are improved; by the adoption of the radial annular inlet (outlet) air muffler device and the main fan body housing muffling structure combining multiple mechanisms, the purpose of noise reduction is achieved. The high-efficiency low-noise axial flow fan can be widely applied to ventilation on various occasions such as mines, tunnels, industries and enterprises.

The invention relates to a blade for a centrifugal fan impeller, the centrifugal fan impeller and an extractor hood. The blade for the centrifugal fan impeller includes a blade body, a first side edgeand a second side edge are arranged on the blade body side by side in the length direction and in an extension mode, wherein the first side edge is an inlet edge corresponding to airflow inflow, thesecond side edge is an outlet edge corresponding to airflow outflow, the blade body is characterized in that a noise reduction part capable of reducing noise is only arranged at the outlet edge, the noise reduction part is strip-shaped and extends in the length direction of the blade body, the noise reduction part includes two straight segments and a curve segment located between the two straightsegments, and the longitudinal section of the curve segment in the length direction of the curve segment is wave-shaped. According to the blade for the centrifugal fan impeller, the noise reduction part is only arranged at the outlet edge of the blade body, compared with the structure which noise reduction parts are arranged at the outlet edge and the inlet edge, the collision loss of an airflow at a blade inlet cannot be aggravated, and thus aerodynamic noise of the impeller cannot be increased.

The invention discloses a high-speed drilling machine with a noise lowering function. The high-speed drilling machine comprise a drilling machine body, the right side of the bottom of the drilling machine body is fixedly connected with a stand column, the bottom of the stand column is fixedly connected with a base, and the top of the drilling machine body is fixedly connected with a transmission mechanism. The right side of the drilling machine body is fixedly connected with a driving motor, an output shaft of the driving motor is fixedly connected with a driving rotary shaft, the top end of the driving rotary shaft penetrates through the transmission mechanism and extends into the transmission mechanism, and the left side of the drilling machine body is fixedly connected with a silencer.According to the high-speed drilling machine, by arranging the base and the silencer, the noise lowering function is achieved, sounds caused by drill bit transmission shaft rotation are subjected to noise lowering through the silencer, vibration between a machined workpiece and the drilling machine is subjected to noise lowering through a damping device in the base when the drilling machine is used, it is avoided that hearing of a worker is damaged by noise pollution damage, health of the worker is guaranteed, and the fame and benefits of factories are guaranteed.

The invention provides a guiding device of the counterweight housing of an elevator and relates to the improvement of the vertical operation guiding device of the counterweight housing of the elevator. The guiding device has simple structure and is convenient to transport. The invention is characterized in that the counterweight housing is arranged in an elevator shaft and operates between the upper end of the elevator shaft and the lower end, a lifting device is connected with the top of the counterweight housing, a pair of guide ropes are arranged between the upper end of the elevator shaft and the lower end, the two sides of the counterweight housing are connected with the guide ropes; the guide ropes are tightened between the upper end of the elevator shaft and the lower end by an upper locking clamp and a lower guide rope tightening device, and antivibrators are separately fixedly connected with the guide ropes on the upper part of the locking clamp and the lower part of the guide rope tightening device. The rigid guide rails of the original guiding device of the counterweight housing are replaced by the flexible guide ropes, thus the guide ropes can be wound during transportation. Considering that the operating environment of the elevator has regular vibration sources, in order to avoid that the vibration sources drive the guide ropes to form a resonance or even a harmonic vibration, the antivibrators are arranged on the guide ropes so as to adapt to the frequencies of different driving sources and have the effects of eliminating vibrations and reducing noises.

The invention discloses a fan and a microwave oven. The fan comprises a hub (22) and multiple blades (22) which are arranged at intervals in the circumferential direction of an outer ring (211) of thehub (21), the blade thickness of the blade-shaped cross section of the blades (22) is gradually reduced from leading edges (223) to tailing edges (224) of the blades, and the blade-shaped cross section is cut out from a radial concentric circle of the outer ring (211) of the hub (21). Therefore, the fan has large stall margin, even if the incoming flow of the inlet blast capacity is high incidence, the separation of boundary layers still cannot occur on the blades, thus generation of stall is avoided, and normal work can still be conducted. Meanwhile, the fan has higher adaptability to the inlet incoming flow, the aerodynamic performance of the fan is better, the blast capacity is larger, and the efficiency is higher. Besides, due to the design of sharp angles of trailing edges of the blades, the tails of the blades are a series of fragmentized small vortex structures, the generation of high broad-band noise is avoided, and thus a certain noise-reduction effect is achieved.

The invention discloses a turbocharger with a remarkable noise reduction performance. The turbocharger comprises a turbine motor housing and a gas compressor housing, wherein a noise reduction layer is arranged on the inner wall of the turbine motor housing; an impeller of a gas compressor is connected with an impeller of a turbine motor through a turbocharger shaft; a vibration-damping gasket ismounted at one side of the impeller of the gas compressor; and micro holes are formed in the inner wall of the gas compressor housing. According to the turbocharger disclosed by the invention, the noise reduction layer is arranged on the inner wall of the turbine motor housing, so that noises generated in a working process of the impeller of the turbine motor are absorbed by the noise reduction layer, and the noise reduction effect is achieved on the turbocharger; the vibration-damping gasket is positioned on the end part of the turbocharger shaft, so that vibrations generated in the working process of the turbocharger shaft can be reduced, and buffer performance is improved, and therefore, noises generated by high-amplitude vibrations in the working process of the turbocharger shaft are reduced; and the micro holes are formed in the inner wall of the gas compressor housing, so that the noises generated in the rotation process of the impeller of the gas compressor are diffused throughthe micro holes, and therefore, the noise reduction effect is achieved.

The invention discloses an electric control booster pump which comprises a booster pump body, and the booster pump body comprises a base, an inlet pipe assembly, a pump body, a booster pipe and a discharge pipe assembly. Inflow liquid can be buffered through the additionally arranged buffer pipe, the liquid with large impact force is prevented from directly rushing into the shell, the service life of the inlet pipe assembly is prolonged, the inner side of the connecting cavity is made of a flexible material, the connecting cavity is filled with non-Newtonian fluid, and by means of the characteristics of the non-Newtonian fluid, the connecting pipe assembly is more stable and reliable. The booster pump can generate vibration during use, the design can absorb the tiny deformation quantity of the booster pump and slow down movement, so that the damping and noise reduction effects are achieved, meanwhile, when the booster pump shakes by a large margin, the non-Newtonian fluid is'hardened ', the better supporting effect on the booster pump is achieved, and the flow adjusting assembly is arranged, so that the flow adjusting assembly can adjust the flow of the non-Newtonian fluid. And an adjusting rod is rotated to move an adjusting triangular plate, so that the flow rate of liquid in the discharge pipe assembly is adjusted, the practicability of the device is improved, and normal use of the booster pump is prevented from being affected.

The invention relates to the technical field of headphones, and discloses a headphone with an active noise reduction function, which comprises a headphone main body, wherein elastic bulges are arranged on the outer wall, in contact with the head of a human body, of the headphone main body when the headphone main body is worn, earmuffs are respectively arranged at two ends of the headphone main body, a control part is arranged on the outer wall of one side of the headphone main body, each earmuff comprises a bottom plate, a protective shell and an inflatable airbag which are connected in sequence, an air pump is arranged in the control part, an inflation inlet is formed in the surface of each inflatable airbag, an inflation tube is arranged between the air pump and each inflation inlet, a deflation opening is formed in the surface of each inflatable airbag, a deflation valve is fixedly installed on each deflation opening, and a microcontroller is arranged on the outer wall of the other side of the headphone main body. According to the headphone with the active noise reduction function, the inflatable airbags and the detachable and replaceable assemblies are arranged, so that the headphone is comfortable to wear and convenient to disassemble and clean, and the problem that dust and sundries are attached and accumulated to affect ear health can be effectively solved.

The invention provides a compressor vibration reduction assembly, a compressor assembly and an air conditioner. The compressor vibration reduction assembly comprises a vibration reduction component (2) and a positioning component (3). The vibration reduction component (2) can wrap a shell of a compressor, the positioning component (3) is arranged on the shell of the compressor (1) and stretches outwards, the vibration reduction component (2) can be allowed to penetrate through the positioning component (3), and therefore the vibration reduction component (2) is positioned in the axis directionof the compressor. By means of the compressor vibration reduction assembly, the vibration reduction component can be accurately and effectively positioned when installed, the problem that packaging is difficult since accurate positioning cannot be achieved during packaging of sound insulation cotton is solved, and the installation efficiency of the vibration reduction component is improved; and the compressor can be packaged in a completely enclosed and fastened mode, and the noise reduction effect is better achieved.

The invention belongs to the technical field of gas turbines, and discloses a rotating vane type efficient noise-reduction air filtering device for a gas turbine. The rotating vane type efficient noise-reduction air filtering device comprises a coarse-efficiency filtering unit and a self-cleaning filter. The coarse-efficiency filtering unit and the self-cleaning filter are arranged in a gas inlet channel of the gas turbine in a spaced mode. The self-cleaning filter comprises a plurality of filter barrels arranged in the gas inlet channel vertically, and the filter barrels are provided with reverse blowing pipes communicated with an external compressed air source through a pipeline. Each filter barrel comprises a filter barrel framework which is composed of an outer metal mesh layer and an inner metal mesh layer, and each outer metal mesh layer and the corresponding inner metal mesh layer form the corresponding cylindrical filter barrel framework with three faces surrounded; a filter layer is arranged between each outer metal mesh layer and the corresponding inner metal mesh layer, and flow guiding bars are obliquely arranged on the inner metal mesh layers; a noise reduction module is arranged at the rear end of the pipeline.