29results about How to "Reduce impact noise" patented technology

The utility model relates to generator set auxiliary equipment technical field discloses a diesel generating set mute big cover convenient for overhauling, including cover body, the cover body top is equipped with the cover body that is composed of two symmetrical cover plates, and the cover plate is through the sliding block and the inverted T type sliding slot of cover body top sliding fit, the inner wall of cover body is equipped with buffer mechanism, and the support arm of buffer mechanism is supported through the elastic support rod, and the support arm end is equipped with gyro wheel no.

The utility model relates to the technical field of printing machine scrapers, in particular to an SMT printing machine scraper which comprises a connecting box, a plurality of adjusting assemblies are arranged at the lower end of the connecting box, pressure sensors are arranged on the adjusting assemblies, buffer blocks are arranged at the lower ends of the adjusting assemblies, and a supporting plate is arranged at the lower ends of the buffer blocks. A main knife is arranged on the bottom wall of the supporting plate, an auxiliary knife sleeve is arranged at the lower end of the main knife, the auxiliary knife sleeve is matched with the main knife and is in damping sliding connection with the main knife, a connecting shaft is arranged at the upper end of the connecting box, the adjusting assembly comprises a control box, a motor, a supporting rod, an adjusting rod and an adjusting block, and baffles are arranged at the two ends of the bottom wall of the supporting plate. The buffer block is of a multi-layer composite elastomer structure, dynamic balance of pressure in different areas of the scraper is achieved, impact noise generated when the scraper works is effectively reduced, and the scraper is particularly suitable for precise printing of high-viscosity solder paste.

The utility model relates to the technical field of swimming pool water outlet, disclose a straight -in type water mouth with side water outlet. It aims at solving the technical problem of low work efficiency of big workload that the water outlet direction setting is on the top cover in the prior art, and the design of vertical direction leads to the dust and sundries of pool bottom gathering at the water outlet position, and only can use the dirt -suction machine to clean, the workload is big, and the work efficiency is low. The utility model includes base, detachable installation top cover above base, set up a plurality of side water outlets on the side of base, base is connected with backwater pipe through side water outlet to form water flow channel, annular supporting block is set up in the inner wall of backwater pipe to support adjustable pressing plate, adjustable pressing plate is installed in the middle of adjustable screw rod, adjustable screw rod is installed in hollow cylindrical structure, hollow cylindrical structure is fixed in annular supporting block through connecting rod, the thread of adjustable screw rod is set up in the inner wall of hollow cylindrical structure. The utility model has the advantages of saving construction time, high work efficiency, low construction difficulty and the like.

This utility model discloses an anti-rotation structure and its oil-free scroll compressor, comprising: a moving disc, on the outer circumferential side of which are at least three first protrusions; a housing, on the side of which adjacent to the moving disc are at least three second protrusions corresponding one-to-one with the first protrusions; and a flange eccentric sleeve connected to a first bearing installed in the second protrusions, wherein a cylindrical pin extending into the flange eccentric sleeve is installed in the first protrusion. This utility model has a simple structure. By changing the large clearance fit between the cylindrical pin and the ring sleeve to a small clearance fit between the cylindrical pin and the flange eccentric sleeve, the fit clearance is effectively reduced, significantly lowering the impact noise between the cylindrical pin and the mating parts. The small clearance fit enhances the stability of the moving pair, suppresses the overturning phenomenon of the moving disc caused by the large clearance, and improves the smoothness and reliability of the compressor operation. It combines the advantages of the pin sleeve anti-rotation structure and the three-crank structure.

This utility model belongs to the field of fan blade technology and discloses a multi-blade noise-reducing blower fan blade, including: a fan blade assembly comprising 53 forward-curved fan blades evenly distributed along the circumference of a hub, with a motor mounting cavity at the center of the hub; the axial end face of the hub has several heat dissipation holes, arranged equidistantly along the circumference to form an annular heat dissipation channel; a motor assembly comprising a thickened silicon steel sheet frame, the silicon steel sheet thickness being 0.5-0.8mm; the ratio of the fan blade diameter D to the fan outer diameter D0 is 75%-78%; this utility model, by using 53 forward-curved fan blades with an optimized bending angle of 15°-25°, and a chord length ratio of the leading edge to the trailing edge of the blades of 1:0.8-1:0.9, effectively suppresses turbulence and eddy noise. An arc-shaped transition section with a transition radius R = 3-5mm is provided at the connection between the hub and the fan blades to reduce airflow separation noise.

This invention discloses a low-noise hydraulic cylinder with adjustable end stroke and its assembly method, belonging to the field of ship vibration reduction and noise reduction technology. The cylinder includes a bow end cap, cylinder barrel, piston, connecting rod, buffer sleeve, stern end cap, and structures such as a reversing oil passage, a buffer oil passage, a reversing oil chamber, and a buffer oil chamber. The buffer sleeve is fitted onto both sides of the connecting rod, forming a closed buffer oil chamber in cooperation with the end cap, cylinder barrel, and piston. During operation, the oil flow rate and pressure of the buffer oil chamber are controlled by adjusting the oil pressure at the buffer port, achieving precise adjustment of the piston and connecting rod end stroke, avoiding rigid collision between the piston and the end cap, and suppressing impact noise at the source. This invention has a compact structure, reliable sealing, and convenient assembly, significantly reducing vibration impact and operating noise, improving the stealth of ships, and is suitable for scenarios with high vibration reduction and noise reduction requirements, such as the opening and closing of ship hull covers.

The utility model discloses a novel noise reduction exhaust system of in-line four cylinder engine belongs to engine exhaust technical field, solves the problem of big exhaust noise of existing in-line four cylinder engine. It includes with the first cylinder exhaust passage, second cylinder exhaust passage, third cylinder exhaust passage, fourth cylinder exhaust passage of in-line four cylinder engine's four combustion chamber - corresponding connection first cylinder exhaust manifold, second cylinder exhaust manifold one end common connection has first exhaust branch pipe, third cylinder exhaust manifold, fourth cylinder exhaust manifold one end common connection has second exhaust branch pipe, first exhaust branch pipe, second exhaust branch pipe one end common connection has the exhaust pipe, first cylinder exhaust manifold with the exhaust pipe between, second cylinder exhaust manifold with the exhaust pipe between all is equipped with the shunt passage of the both intercommunication. The utility model's exhaust system effectively reduces the main gas flow noise of exhaust, prolongs the service life of engine.

The utility model provides a kind of spherical elbow belongs to pipe fitting technical field.It solves the problem of uneven distribution of fluid at branch and generation of larger noise in the prior art multi-channel elbow.The spherical elbow includes main pipe body, the main pipe body has several branch pipe bodies respectively with the communication of main pipe body, the main pipe body is spherical, the inner wall of each branch pipe body has several flow guide protrusions, the flow guide protrusions are spirally extended from the water inlet end of branch pipe body to the water outlet end, the pipe wall of branch pipe body has noise reduction hole along the length direction of branch pipe body, the noise reduction hole has multiple and is interval setting along the circumference of branch pipe body.The utility model has the advantage of solving the problem of larger noise generated during use of existing multi-channel elbow.

This application discloses an architectural planning and design model sand table, belonging to the field of sand table technology. The model sand table includes a base, a box mounted on the base, and a main body of the model sand table located at the end of the box away from the base. The box is equipped with a storage mechanism for storing the main body of the model sand table. The storage mechanism includes a frame that moves axially on the box, a drive component mounted on the box for moving the frame closer to or away from the base, and a dustproof cover at the end of the frame away from the base. Through the cooperation of the height-adjustable frame and the dustproof cover, the model sand table achieves the dual functions of dustproof storage and enclosure protection. During storage, the frame can be raised above the model's height using the drive component, and then the dustproof cover can be closed to effectively isolate dust. During display, the frame can be adjusted to a suitable height to form a fence surrounding the model, reducing damage from external collisions and improving the practicality and protection of the sand table.

The application discloses a noise-reducing energy-saving environment-friendly transformer, which comprises a lower sound insulation frame and an energy-saving transformer, damping recessed seats are arranged on the both sides of the bottom of the inner cavity of the lower sound insulation frame, and the energy-saving transformer is located in the inner part of the lower sound insulation frame, and belongs to the technical field of transformers. The noise-reducing energy-saving environment-friendly transformer is characterized in that rectangular pull openings are arranged on the surface, the rear part and the both sides of the lower sound insulation frame, first positioning plates and second positioning plates are arranged on the inner sides of the rectangular pull openings respectively, and tooth blocks are arranged on the first positioning plates and the second positioning plates. After the energy-saving transformer is installed, the second spring is used to make the buffer block always adhere to the energy-saving transformer, so that the impact sound of the energy-saving transformer is reduced. In addition, the first positioning plate and the second positioning plate are always used to push the buffer block to adhere to the energy-saving transformer by the second spring when the energy-saving transformer vibrates and a gap is generated between the energy-saving transformer and the buffer block.

This application relates to the field of high-voltage equipment safety technology, and in particular to an interlocking device for a high-voltage switchgear. The device includes a protective cover, a first rotating plate, a second rotating plate, a third rotating plate, and a linkage rod, all installed on the back of the high-voltage switchgear door. The first rotating plate is driven by a rotating column, and the second and third rotating plates rotate synchronously with the first rotating plate via the linkage rod. Each rotating plate is connected to a connecting rod and a locking pin. The rotation of the rotating plate drives the locking pins to extend or retract synchronously, achieving multi-point locking and unlocking of the door and door frame. The device also includes a telescopic assembly with a controller linked to the high-voltage switchgear's electrical circuit. This controller automatically controls the extension and retraction of the locking column based on the high-voltage switchgear's energized state, achieving forced locking during energization and automatic unlocking during power failure. This application simplifies the operation process, has a stable and durable structure, and effectively improves the operational safety and maintenance convenience of the high-voltage switchgear.

The invention relates to a steering engine speed reduction transmission system and method based on a linear gear. The transmission system comprises a shell assembly, a driving motor, an output shaft and a speed reduction mechanism. The speed reducing mechanism is arranged in the shell assembly and is configured to transmit the output torque of the driving motor to the output shaft; the speed reducing mechanism comprises at least one level of linear gear pair, and the linear gear pair is formed by meshing a driving linear gear and a driven linear gear; and the driving line gear and the driven line gear are respectively generated by a preset space curve and a conjugate curve thereof, and form point contact pure rolling in the meshing transmission process. Through cooperation of all the mechanisms, the single-stage large-transmission-ratio design is achieved through the small tooth number by means of the characteristic that a linear gear is free of undercutting limitation. Compared with a steering engine adopting an involute gear, the friction loss is reduced, the vibration noise is reduced, the structure compactness is improved, and the steering engine is suitable for micro steering engines, robot joints, precise executing mechanisms and other scenes.

The utility model provides a kind of engine cooling system, including engine, air inlet cover, air duct and heat exchanger, air duct is arranged between air inlet cover and heat exchanger, air duct is respectively communicated with the cold air inlet end of air inlet cover and heat exchanger, one end of engine is provided with fan, fan is set in air duct, the heat dissipation port of engine is communicated with the heat exchange air inlet of heat exchanger, at least one air guide channel and at least two first sound attenuation components are provided in air duct, first sound attenuation component is provided on the both sides of air guide channel, first sound attenuation component includes first air deflector and first sound attenuation cotton, first cavity is provided in first air deflector, a plurality of first perforations are set on the surface of first air deflector, first perforation is communicated with first cavity, and first sound attenuation cotton is set in first cavity;The utility model has the advantages of simple structure, high cooling efficiency and low noise.

The present application relates to a kind of crankshaft units, aero-engine and aircraft, belong to aerospace technology field, when flexible disc is directly connected with starter, the problem that the rotation moment of flexible disc is big, the gear of starter is easy to impact with starting gear ring at initial meshing moment, bring strong vibration and damage starting gear ring is solved.The present application includes crankshaft and flexible disc;Flexible disc is set to one end of crankshaft;Flexible disc includes disc body and starting gear ring being set to the edge of disc body along circumference;Starting gear ring is used to mesh with the gear of starter;Wherein, starting gear ring includes multiple sections being distributed along circumference, adjacent section can relatively move.The present application reduces the impact and vibration generated when the gear of starter is meshed with starting gear ring.

This invention discloses a volute, a fan, a smart appliance, and a method for generating the volute profile. The volute's annular wall includes a volute tongue segment, a first helical segment, a second helical segment, a third helical segment, and a fourth helical segment connected sequentially. The first height boundary point of the volute is located between a first feature point and a first width boundary point. The second feature point is the first width boundary point. The third feature point is located between the second width boundary point and the second height boundary point of the volute. The fourth feature point is the second width boundary point. The first helical segment includes a first helical sub-segment and a second helical sub-segment. The profiles of the first helical sub-segment and the second helical segment have opposite helical directions. Using the embodiments disclosed in this invention, even in limited space, uniform airflow within the volute can be ensured, thereby improving the aerodynamic performance of the fan.

The present application relates to the field of towing seat, specifically to the magnetic force self-locking towing seat, including towing seat shell, the inside articulated pawl of towing seat shell, the inside linear slide rail of towing seat shell is set up, the inside of linear slide rail is provided with the guide drive mechanism for starting when entering by towing pin, the present application is switched by ingenious magnetic circuit design, makes the tow pin in the process of insertion mechanical drive magnet two rotation, automatically changes its with fixed magnet one magnetic pole opposite relation, thereby in the absence of external power, intelligent control magnetic field generation and blanking.When the magnetic pole is in the same direction, the magnetic field is guided out through the metal sheet, forming strong suction force, the pawl is quickly attracted, realizing the instantaneous locking of magnetic force auxiliary.The process greatly reduces the insertion force and impact noise required by pure mechanical locking, makes the connection action more smooth, soft, and the magnetic attraction force ensures the sufficiency and consistency of locking, improves the connection reliability and operation experience.

This utility model discloses a paper receiving bracket mechanism for a high-speed carton gluing machine, comprising: a frame; a paper receiving bracket slidably mounted on the frame; the paper receiving bracket is driven to move up and down by a servo motor, a gearbox, and a lifting mechanism; the power output end of the servo motor is driven to the power input end of the gearbox, and the power output end of the gearbox is connected to the power input end of the lifting mechanism. This utility model's paper receiving bracket uses a servo motor and a gearbox to drive its up and down movement, which, compared to gear-driven systems, enables high-speed up and down movement and simplifies the structure.

The invention relates to the technical field of automobile electronic testing, and discloses a power amplifier connection switching system for automobile sound equipment calibration, which comprises a central control module, a multi-channel switching matrix module, a state monitoring and analyzing module and a communication interface module. The multi-channel switching matrix module integrates a switching element array and an auxiliary switching network comprising a current-limiting resistor and an energy discharge branch; the state monitoring and analyzing module is used for monitoring electrical characteristics of equipment and capturing a signal zero crossing point. And the central control module responds to the switching instruction, calculates a switching risk index based on a load characteristic baseline and a target power amplifier damping coefficient, selects a direct switching, soft start or zero-crossing synchronous soft start strategy according to the switching risk index, and drives a switching matrix to execute a corresponding time sequence action. According to the invention, through quantitative risk assessment and multi-level strategy matching, switching surge and contact arc are effectively suppressed, audio impact noise is reduced, and safety and data accuracy of a calibration process are improved.

The application provides a kind of to stimulate hard rock inherent micro crack group extension and open up device and open up method, belong to roadway excavation technical field.Solve the current hard rock roadway drivage efficiency low problem.Its technical scheme is: including cracking mechanism, cutting arm mechanism, cutting mechanism, driving mechanism and support frame, support frame is installed in the front end of the rotary support of the heading machine, cutting arm mechanism is connected with support frame, cutting mechanism is arranged at the end of cutting arm mechanism away from support frame, cracking mechanism is rotationally arranged on cutting arm mechanism for cracking hard rock, driving mechanism is connected with cracking mechanism, cutting arm mechanism, cutting mechanism and support frame respectively, driving mechanism is used to drive cutting arm mechanism to pitch and swing and drive cracking mechanism to swing around cutting arm mechanism to change position.The beneficial effects of the application are: the application first cracks the inherent micro crack group of the hard rock roadway by the cracking mechanism, and then cuts the hard rock by the cutting mechanism, improving the cutting efficiency of the hard rock roadway.

The utility model discloses an oil tank built -in noise reduction structure in the field of oil tank, including hollow's stand, be provided with the perforated plate in the stand, the perforated plate will stand inside part divide into upper cavity and lower cavity, the outer periphery of stand corresponds lower cavity and is provided with a plurality of liquid inlet, correspond the upper cavity is provided with the float that can move up and down with the oil surface, the float is connected with the noise reduction board through at least one connecting piece, the outer periphery of stand corresponds the upper cavity and is provided with the limit slot that can connecting piece pass. The utility model can dynamic self -adaptation oil fluctuation, keep the noise reduction board in the best noise reduction position, solved the problem that fixed structure adaptability is poor.

A valve body is provided with a valve cavity, the valve cavity is provided with a main valve port, a valve cover is connected with the valve body and provided with a clamping groove, a waterproof coil is located above the valve cover, a magnetism isolating pipe is arranged in a driving cavity, the outer wall of the magnetism isolating pipe is provided with a pressing ring, and a fixed iron core and a movable iron core of the magnetism isolating pipe are arranged in the magnetism isolating pipe. The mute part is arranged between the valve cavity and the main valve port, a first sealing ring of the mute part is embedded in the clamping groove, a diaphragm of the mute part is installed in the installation port and connected with the movable iron core, a convex ring of the diaphragm is embedded in the sealing groove and extends to the position above the first sealing ring, a pressing ring of the diaphragm is attached to the upper surface of the convex ring and abuts against a pressing ring of the magnetism isolating pipe, and a piston of the mute part is arranged in the valve cavity in a sliding mode and matched with the main valve port. The sealing piece is used for opening and closing a pilot valve port of the piston, and the sealing structure seals the driving cavity. The technical scheme has the advantages of low operation noise, strong capability of adapting to a humid environment, relatively low requirement on driving force, large drift diameter of the valve port and the like, meanwhile, the abrasion of a sealing structure can be avoided, and the service life is relatively long.

The utility model discloses a double-air-duct warm air blower, which comprises a shell, a first air duct, a second air duct and a mixed air cavity, wherein the shell is provided with the first air duct, the second air duct and the mixed air cavity; the tail end of the first air duct and the tail end of the second air duct are both communicated with the mixed air cavity; the shell is provided with an air outlet communicating with the mixed air cavity. A first fan and a heating assembly are arranged in the first air duct; the first fan is used for conveying hot air generated by heating of the heating assembly to the mixed air cavity and blowing the hot air outwards; a second fan is arranged in the second air duct; and the second fan is used for conveying external air into the mixed air cavity and blowing out hot air in the mixed air cavity together through the air outlet. According to the utility model, the two air channels are converged in the mixed air cavity and then are subjected to tangential air output, so that concentrated and strong hot air flow can be formed, the heating distance and the air speed are increased, and efficient heat flow circulation and remote heating effects are realized; by means of the two-air-duct shunting design, the hot air rising problem can be effectively relieved, indoor temperature balance is kept, and airflow impact noise can be effectively reduced.

The low-noise axial flow fan comprises a machine shell, a mounting base, an impeller and a driving mechanism, the mounting base is fixed in the machine shell, the mounting base is connected with the driving mechanism, and the driving mechanism is connected with the impeller; the shell is connected with a flow guide cover, and a plurality of flow guide strips arranged along an involute angle are arranged on the inner wall of the flow guide cover; the impeller comprises a hub and blades, the blades are provided with a plurality of sound absorption holes, and cutting teeth are arranged at the outer ends of the blades. The involute type flow guide strips are arranged, so that the impact of airflow on the inner wall of the fan is reduced, and the impact noise is effectively reduced.

The utility model discloses electric steamer, including the base of being equipped with water tank and the juice receiving disc of being placed on the base, be equipped with the water storage cavity and steam generation cavity of independent setting in the water tank, be equipped with the water replenishment channel of limiting water by the water storage cavity flow to steam generation cavity between the water storage cavity and steam generation cavity, and the water storage cavity top is open and forms the water inlet, and the water replenishment channel has the water outlet with steam generation cavity intercommunication and higher than steam generation cavity bottom surface, and the base still includes the water control switch for controlling the opening and closing of water replenishment channel, and the water control switch is used for closing water replenishment channel when the juice receiving disc is separated from the base, and the juice receiving disc is sealed with the base cooperation to water inlet, and the water control switch is used for opening water replenishment channel when water inlet is sealed. The utility model discloses electric steamer, and the user is convenient to the water storage cavity and adds water, and the water is simple and convenient to add, in addition, can also realize the automatic replenishment of a certain water amount to steam generation cavity, to realize the effect of fast steam, prevent dry burning.

This invention discloses a geared motor and a refrigeration appliance. The geared motor includes a motor body, a gearbox assembly, and a drive plate. The drive plate is electrically connected to the motor body. The gearbox assembly includes a gearbox body and a gear set, where at least some gears have helical teeth. The motor body includes a motor bracket located outside the gearbox body. The output shaft of the motor body passes through the motor bracket and connects to the gear set inside the gearbox assembly. This invention fundamentally solves the problem of motor installation concentricity deviation, eliminates abnormal vibration and noise caused by eccentricity, and thus significantly reduces operating noise while maintaining good concentricity.

This application relates to the field of noise reduction equipment technology, and provides a noise reduction device, including: a plurality of noise reduction pipes, each having a noise reduction chamber for eliminating the impact noise of exhaust from the pneumatic device's exhaust valve; the plurality of noise reduction pipes being interconnected; at least one air inlet port located on the outer surface of the noise reduction pipes, connected to the noise reduction chamber, and used to connect to the exhaust valve port of the pneumatic device; and a negative pressure generating device located on the noise reduction pipes, used to draw air from the noise reduction chambers. This invention isolates the impact noise of high-frequency airflow from the pneumatic device through the noise reduction chambers of the noise reduction pipes and discharges the high-pressure airflow outdoors, preventing the exhaust airflow from disturbing the working environment, thereby effectively reducing the noise generated by the pneumatic device's exhaust valve. Furthermore, the negative pressure environment within the noise reduction chambers buffers the impact of the airflow, further reducing noise.

This utility model discloses a folding table in the field of folding furniture technology, aiming to solve the problems of heavy weight, the need to press the folding device for folding, and friction noise generated during folding in the prior art. It includes an aluminum honeycomb tabletop and table legs; the aluminum honeycomb tabletop includes a first aluminum honeycomb tabletop and a second aluminum honeycomb tabletop, which are hinged together by a folding connector. A folding lock is provided between the two aluminum honeycomb tabletops for locking when unfolded or folding them up; the table legs are provided in two sets, each set of table legs is connected to the aluminum honeycomb tabletop by a rotating connector. The rotating connector allows the table legs to rotate around it and rest against the inner folding surface of the folded aluminum honeycomb tabletop, and the table legs within each set are rotatably connected; a sound-insulating washer is provided between the contact surface of the rotating connector and the table legs; this utility model achieves the functions of being lightweight, easy to operate, and reducing friction noise during folding.

This invention discloses a self-generating ground spring lock for use in glass doors. The glass door has a pivot, and a pin seat is located at the bottom of the glass door near the pivot. The self-generating ground spring lock includes a housing, within which a power generation component and a control motor are housed. The rotating end of the power generation component is fixedly connected to the pivot of the glass door. The output end of the control motor is connected to a pin assembly, which corresponds to the pin seat. A cam is provided within the housing, fixedly engaged with the pivot. One end of the cam has a return spring plate that rolls with the cam, and both ends of the return spring plate are connected to damping components. This invention enables self-generation and provides damping buffering, effectively reducing damage to the door from impacts.