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

The invention discloses a method for reducing start-up noises of a server system, which belongs to a server static starting method. The method adopts a PWM speed regulating device to control the fan rotating speed in the start-up process of the server system so as to reduce the start-up noises of the server system, wherein the PWM speed regulating device comprises a power module, a pulse generation module, a switching module and a control module; the power module supplies electricity to the pulse generation module, the switching module and the control module; a PWM signal on a mainboard of the server system is input to the switching module and the control module; a PWM signal generated by the pulse generation module is input to the switching module; the switching module selectively outputs the PWM signal on the mainboard or the pulse generation module according to a switching control signal of the control module; and the PWM signal control the fan rotating speed. Compared with the prior art, the method for reducing the start-up noises of the server system can reduce the start-up noises of a server to ensure that the server is started quietly and does not limit the fan rotating speed when the system is in heavy duty service.

The invention provides an electric kettle which comprises an inner container, a noise reduction layer, a heat conduction plate and a heating device; the inner container comprises a bottom plate and side enclosing plates; the bottom plate is connected with the side enclosing plates to form an accommodating cavity for accommodating liquid; the noise reduction layer is arranged on the bottom plate and is positioned in the accommodating cavity, and the upper surface of the noise reduction layer is uneven microscopically; the heat conduction plate is arranged under the bottom plate; the heating device is arranged on the heat conduction plate; when the electric kettle heats the liquid, the upper surface of the noise reduction layer is uneven to accelerate the generation and the aggregation of air bubbles. The electric kettle provided by the invention has the benefits that through the noise reduction layer, different areas on the bottom plate are uniformly heated, so that the rate when the air bubbles are separated from the noise reduction layer is reduced; meanwhile, the generation and the aggregation of the air bubbles are accelerated, so that the plurality of small air bubbles are aggregated into big air bubbles, the problem of large noise caused by implosion, namely disappearance after a large amount of single small air bubbles is changed into the big air bubbles in the rising process is solved, ,the noise generated when the electric kettle heats the liquid is reduced, and the use conform of the product is improved.

The invention relates to the technical field of lubricating grease, in particular to low-noise lubricating grease suitable for micromotors and a preparation method of the low-noise lubricating grease. The method comprises the steps that base oil with different viscosities and types is adopted for blending, structure modifier is added, the lubricating grease forms a layer of better oil film on the contact surface of a workpiece, and the noise reduction effect is effectively achieved. Meanwhile, the lubricating grease is prepared by reacting compound base oil with compound thickening agents, and therefore the service life of the lubricating grease is effectively prolonged. According tot he lubricating grease prepared through the method, the technology is simple, and the production cost is low. When the lubricating grease is used in the micromotors, the surface of the workpiece can form a layer of effective protective oil film, the lubricating grease is not prone to runoff when the micromotors run at a high speed, the high-temperature resistance is good, and good effects of lubricating, noise reduction and rust prevention are achieved.

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 a heat dissipation and noise reduction structure of a dry-wet dual-purpose motor. The heat dissipation and noise reduction structure comprises a motor cover and a motor chamberarranged in the motor cover, wherein multiple cooling air inlets are formed in the upper end of the motor cover, a sucked air inlet is formed in the lower end of the motor cover, an air outlet is formed in a side wall, an air outlet channel communicated to the air outlet is formed between the motor chamber and the motor cover and surrounds the motor chamber, a heat dissipation cavity communicatedto the cooling air inlets is formed between the motor body and the motor chamber, multiple heat dissipation air discharging channels separated from the air outlet channel are formed between the heatdissipation cavity and a heat dissipation air outlet formed in a dust collector shell, a housing for suction blades of the motor, the lower end of the motor cover and the motor chamber form an eddy cavity spaced from the heat dissipation cavity, an inlet of the eddy cavity is communicated to an air suction channel in the motor, and an outlet is communicated to the air outlet channel. The heat dissipation and noise reduction structure conducts heat dissipation on the motor through one-way flowing of multiple gusts of cooling air and can improve the heat dissipation efficiency and form a multi-layer sound-insulated noise reduction structure.

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 drainage and noise reduction structure of a washing machine. The drainage and noise reduction structure comprises a telescopic hose capable of contracting and expanding in the radial direction; a drainage channel allowing washing water to pass through is arranged in the telescopic hose; the telescopic hose contracts in a free state to close the drainage channel; and whenthe washing water flows through the telescopic hose, the telescopic hose expands outwards by overcoming the self-elasticity to open the drainage channel. The invention further discloses the washing machine, and the drainage and noise reduction structure of the washing machine is arranged in the washing machine. By arranging the drainage and noise reduction structure of the washing machine, in a drainage process of the washing machine, the telescopic hose can easily open the drainage channel under the action of water flow pressure, so that impact of water flow on air is relieved and the noise reduction effect of the washing machine can be achieved; and in a non-drainage state of the washing machine, the telescopic hose automatically contracts, so that bacterial mildewing caused by the factthat residual washing water in a drainage pump of the washing machine enters a washing barrel in the form of water vapor and the like is avoided.

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 relates to the technical field of motor housings, in particular to a heat dissipation assembly for a motor housing, and the motor housing comprising the same. The heat dissipation assembly comprises a three-layer structure: a heat tube, a heat dissipation housing, and cooling fins. The heat dissipation housing is coaxial with the motor housing, and is disposed outside the motor housing. The heat tube is disposed in an interlayer between the external surface of the motor housing and the internal surface of the heat dissipation housing. The heat tube is arranged in the radial direction of the periphery of the motor housing, and the cooling fins are disposed on the external surface of the heat dissipation housing, are parallel to the motor housing, and are distributed in the axial direction of the periphery of the external surface of the heat dissipation housing. The heat dissipation assembly of the motor housing guarantees the sealing performance of the motor housing and the structural integrity while guaranteeing the heat dissipation performance. Moreover, the heat dissipation assembly is low in manufacturing difficulty, is convenient to assemble, and is good in marketprospect. The technical scheme is suitable for a common motor, and is especially suitable for a new-energy automobile motor.

The invention relates to the technical field of lubricating greases, in particular to low-noise lubricating grease suitable for a juicer and a preparation method of the lubricating grease. By adding a nanoscale material with a noise reduction effect and meanwhile adding a moderate amount of an additive in a process of synthetizing urea-based lubricating grease, the lubricating grease has excellent abrasion resistance and an extreme pressure property as well as excellent high temperature performance. Besides, different solid fillers with certain microwave absorbing properties are introduced into the lubricating grease, noise produced by irregular vibration during gear operation can be effectively lowered, and an effective 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 discloses a vehicle-mounted air inlet valve. The vehicle-mounted air inlet valve comprises an upper valve body and a lower valve body. The upper valve body is fixedly connected with thelower valve body. A valve cavity is cooperatively formed in the upper valve body and the lower valve body, an air inlet communicating with the valve cavity is formed in the upper valve body, an exhaust port communicating with the valve cavity is formed in the lower valve body, a valve element and a valve element spring are arranged in the valve cavity, one end of the valve element spring abuts against the lower valve body, and the other end of the valve element spring abuts against the valve element. The valve element abuts against the upper valve body under the effect of the valve element spring in order to block the portion between the air inlet and the valve cavity, multiple shunting blocks are arranged at the position, located on an air outlet, of the lower valve body, one ends of themultiple shunting blocks are evenly distributed along the circumference of the inner wall of the lower valve body, the other ends of the multiple shunting blocks are connected with the position of thecircle center of the inner wall of the lower valve body, and the shunting blocks and the lower valve body are of an integrally-formed structure. The upper valve body and the lower valve body are arranged, the effect of lowering noise can be achieved, and the shunting blocks and the lower valve body are of the integrally-formed structure, so that it is guaranteed that the shunting blocks are not separated from the lower valve body.

The invention discloses a polishing device convenient to replace for machining. The polishing device comprises a fixing frame and a motor. The motor is fixedly connected to the inner top wall of the fixing frame through a tripod, and the lower end of the vertical section of the fixing frame is rotationally connected with multiple rotating rods. When a first moving rod enters a first through hole,a locking rod is disengaged from an L-shaped moving rod and enters a lock groove to be fixed. After a second moving rod enters a fixing groove, a third moving rod enters a fourth through hole, the polishing device is fixed, a screw enters a screw hole and is screwed, the polishing device is fixed again, and detaching can be completed only by pulling out the locking rod and the fixing frame in sequence. When polishing stone starts to work, produced mechanical vibration is reduced through a first rubber plate and a second rubber plate, and therefore the noise reduction effect is achieved. Accordingly, the device not only can achieve the effect that replacement is convenient and fast, but also can achieve the noise reduction effect.

The invention relates to the technical field of machining centers, in particular to a low-noise vertical machining center. The low-noise vertical machining center comprises a main machine and a protective frame. The outer side of the main machine is covered by the protective frame. The main machine comprises a machine frame, a workbench, a machining portion and a tool rest, wherein the workbench, the machining portion and the tool rest are installed on the machine frame. The machining portion is hung above the workbench in a lifting mode. The tool rest is located on one side of the machining portion. The inner wall of the protective frame is provided with an acoustic panel. The tool rest is provided with a silencer. The position, provided with the workbench, of the machine frame is provided with a damping belt. Noise produced by the machining portion in the machining process is isolated through the acoustic panel, the noise is effectively reduced when a tool of the tool rest is replaced through the silencer, vibration of the workbench is relieved through the damping belt in the machining process of the machining portion, a protection effect can be effectively achieved, and meanwhile noise brought by machining can be effectively reduced.

The invention discloses a ventilation air-conditioning equipment shock insulation machine room and a construction method and regulation system thereof. The ventilation air-conditioning equipment shock insulation machine room comprises a machine room body, wherein the machine room body comprises a support frame arranged on the ground and a support platform for supporting the machine room body, a damping support device capable of reducing vibration of the support platform on the support frame through elastic action is arranged between the support platform and the support frame, and an adjusting device capable of adjusting the damping force of the damping support device through compression action is arranged in the damping support device. By additionally arranging the adjusting device, the damping force of the damping support device can be changed so as to change the frequency of an elastic material, and then vibration on the support frame caused by the support platform is effectively reduced and denoising is achieved; meanwhile, due to the fact that the support platform is connected with the ground through the support frame only, vibration can only be transmitted through the damping support device, and then vibration can be effectively reduced by changing the elasticity and frequency of the position.

The invention aims to provide an industrial air filtering system. The industrial air filtering system comprises an air sucking device, an air sucking pipe, a first air inlet pipe, an air inlet pipe valve, an activated carbon filtering box, an activated carbon filtering rod, a connection locking component, a water storage tank, a steam generator, a first connecting pipe, an effluent control valve,a steam inlet pipe, a second connecting pipe, a filtering box, a medium efficiency filter, a noise-reducing plate, a high-efficiency filter, an air guide connecting pipe, a second air inlet pipe, a steam-water mixing box, a damping plate, a water spraying pipe, a water spraying hole, a water tank, an air storage box, a water spraying pump, a first air outlet pipe, a first air outlet control valve,a PP cotton filtering mechanism, a membrane filtering mechanism, a second air outlet pipe, a pressure detector, a second air outlet control valve, an exhaust fan and a second-level air filter. The air sucking device is installed at the lower end of the air sucking pipe. The industrial air filtering system is capable of, through installing the noise reducing plate, performing multiple times of noise reduction treatment, thereby achieving the noise reducing effect, and reducing pollution of a noise to an environment.

The invention discloses anti-impact efficient adhesive tape. The anti-impact efficient adhesive tape comprises a tape protecting shell; the tape protecting shell comprises an annular side wall and twocircular plates, a tape outlet hole is formed in the annular side wall, and a cutting-off device is arranged on a pulling hole; and a roller is rotationally connected into the tape protecting shell,buffer tape is wound on the roller, and the buffer tape is composed of a plurality of adhering assemblies. A buffer cavity is formed between a top film and a bottom film and filled with a pressure-sensitive adhesive and an air mixture, in this way, the pressure-sensitive adhesive in the buffer cavity is non-Newtonian liquid and thus achieves a buffering effect when suddenly impacted by external force, and meanwhile air in the pressure-sensitive adhesive achieves a noise reduction effect; and a plurality of communicating holes and flow guiding grooves are formed in the bottom of the bottom film, the pressure-sensitive adhesive in the buffer cavity flows to the position between the buffer tape and an object to provide a stable colloid source for connection of the object, and accidental stripping caused by the lack of the pressure-sensitive adhesive at the bottom of the bottom film in the transport process to the object is avoided.

The invention relates to the technical field of tea leaf processing and relates to a chip screening device. The chip screening device aims at solving the technical problems that stability is poor, andthe screening accuracy is affected. In order to solve the above technical problems, the chip screening device is provided and comprises a base. A speed reduction motor, a first stand column and a second stand column are fixedly connected to the top of the base from left to right. An output shaft of the speed reduction motor is fixedly connected with a drive wheel, and the drive wheel is in transmission connection with a driven wheel through a conveying belt. One side of the driven wheel is fixedly connected with a rotating shaft, and a first bearing is inlaid in the first stand column. A second bearing is inlaid in the top in the second stand column. When the chip screening device is used for screening, stability of a screening mechanism can be ensured, the problems that the interior of the screening mechanism is not uniform and the screening accuracy is affected are avoided, and the tea leaf processing efficiency is improved effectively.

The invention relates to a movable heat dissipation cabinet for big data analysis, which comprises a base and a soft cushion layer, wherein a cabinet body is distributed at the top of the upper end ofthe base; fixing grooves are formed in the two ends of the front face of the cabinet body; the soft cushion layer is attached to the interior of the fixing groove; the two ends of the base are movably connected with first hinges; a door body is distributed on the other side of the first hinge; embedded blocks are distributed at the two ends of the inner wall of the door body; and an embedded plate is welded in the middle of the embedded block. As the base and the cabinet body are arranged, a welding integrated structure exists between the base and the cabinet body, the base and the cabinet body are used as basic equipment of the whole device, connection is carried out by adopting a welding mode, the connection strength is high, the structure is stable, moving wheels are arranged on the inner side of the base and can effectively reduce the friction coefficient between the base and the ground, and when a user needs to adjust the device, the user can push the cabinet body to move the cabinet body, so that the flexibility of the device is improved.

The invention relates to the technical field of metal trays, and discloses a rough machining device for metal tray production. The rough machining device comprises a bottom plate. The upper surface ofthe bottom plate is fixedly connected with an internally hollow workbench. Two sliding rails are fixedly connected to the inner bottom wall of the workbench. The interiors of the two sliding rails are slidably connected with sliding blocks. The top ends of the two sliding blocks are fixedly connected with two racks. The upper surface of the bottom plate is rotationally connected with a circular column through a bearing. The two sliding blocks are symmetrically distributed with respect to the circular column. According to the rough machining device for metal tray production, when a material isdrilled, a working motor drives a crankshaft to rotate, a sleeve drives a connecting rod to move, the connecting rod pulls a piston to move, gas in the piston is exhausted through a gas outlet nozzle, a gas pipe and an annular gas spray nozzle, the outer surface of a drilling cutter is sleeved with the annular gas spray nozzle, waste chips generated in the drilling process are blown into a wastebox, and the effect of conveniently collecting the waste chips is achieved.

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.

The invention discloses a fixed structure for existing window frames and sound insulation windows. The fixed structure for the existing window frames and sound insulation windows is characterized in that the fixed structure comprises the sound insulation windows, a connection device and a hooking device; the sound insulation windows are connected with the existing windows sequentially through theconnection device and the hooking device; the existing window frames, the connection device and the sound insulation windows are enclosed to form a sealed cavity; the hooking device comprises a fixingpiece and a hooking piece, wherein the fixing piece is connected with the connection device while the hooking piece is connected with the existing window frames; a through hole is arranged on the hooking piece; the fixing piece is connected with the hooking piece through a removable universal connecting piece. The fixed structure for the existing window frames and sound insulation windows has theadvantages of damaging no walls, not being based on original walls, being easy to remove and install, improving installation efficiency of the sound insulation windows, saving time and reducing working intensity of personnel due to the fact that the fixed structure has replaced a connection mode of directly applying screws and the expansion bolts, and the sound insulation windows are connected with the existing window frames through the connection device and the hooking device.