33results about How to "Reduce working noise" patented technology

An ultra-long-range phase change injection oil production device includes tubing that passes through a wellhead flange and is inserted into a casing. A crude oil outlet is located at the upper end of the tubing, and a lower check valve is located at the lower end, ensuring that water-bearing crude oil can only enter the tubing from the casing. A heating device is located inside the tubing, above the lower check valve, to heat the water-bearing crude oil entering the tubing and generate steam. A limiting sleeve is located at the lower part of the tubing, and a sliding lifter is supported on the limiting sleeve. The sliding lifter has a sliding clearance fit with the inner wall of the tubing and slides upward under the action of steam, thereby pushing the water-bearing crude oil upward. An upper check valve is located on the tubing, above the sliding lifter, ensuring that the water-bearing crude oil, after being pushed upward, can only enter the upper part of the tubing from bottom to top through the upper check valve. The advantages are: low mechanical wear throughout the operation, high reliability, long stroke of the sliding lifter, high working efficiency, and low operating noise; moreover, it eliminates the need for a wellhead heating device, resulting in low oil production costs.

This invention provides a single-sided controllable, rise-type venetian blind insulated glass unit, comprising a window frame, venetian blinds, a controller, and a lifting assembly. The venetian blinds are located inside the window frame and have a traction beam connected to the lifting assembly. The side frame of the window frame has an extension edge facing the venetian blinds, and the extension edge has a groove. The controller is located on one side of the window and is divided into an inner controller and an outer controller. The inner controller is located inside the window frame, and the outer controller is located outside the window frame. The unit also includes a tilting assembly, which comprises a tilting shaft, several tilting ladder ropes, several tilting seats, a rack, and a clutch mechanism. The clutch mechanism ensures that after the venetian blinds are tilted to their maximum angle, the tilting shaft and the gear shaft disengage, eliminating the need to overcome additional friction from the tilting ropes, thus greatly reducing the control force and operating noise.

The utility model provides a spiral vibration fat -burning machine relates to fitness equipment technical field, including base, pedal, fixed frame and vibration frame, is equipped with the fat -burning module on fixed frame, is used for driving vibration frame and pedal to make longitudinal reciprocating motion, the middle part fixed vibration frame has the mounting panel, sets up spiral vibration module on it, this module is constituted by vibration motor and eccentric block, motor is inverted in the mounting panel bottom surface, the output shaft is upwardly through the through -hole and is connected eccentric block, drives pedal to make transverse reciprocating motion. Through the complex effect of longitudinal and transverse vibration, form spiral vibration track, can multidimensional stimulation human muscle group, simulate real movement mode, effectively promote fat -burning efficiency and exercise effect.

A food waste disposer and a sink incorporating the disposer are disclosed. The disposer includes: a housing with an internal cavity, and a flat plate within the cavity. The flat plate is positioned relative to the top wall of the cavity and relative to the bottom wall, dividing the cavity into an upper chamber above the flat plate and a lower chamber below the flat plate. The upper side wall of the lower chamber has a feed inlet penetrating its own wall thickness, and the lower part of the lower chamber has a discharge outlet. The upper chamber has a first water outlet and a water inlet for external water supply, the first water outlet being located on the flat plate to connect the upper and lower chambers. A pulverizing component is disposed within the lower chamber and operates under the drive of a driving mechanism to pulverize food waste entering through the feed inlet. In this invention, the flat plate at the top of the lower chamber and the top wall of the cavity above the flat plate can prevent the noise generated by the pulverizing component from propagating upwards, thereby reducing operating noise.

The utility model relates to commodity display stand technical field, concretely is a screen product turntable, include: base, base includes mounting panel, and the transmission shaft is rotationally installed in the mounting panel centre, drive component, drive component includes power source, and power source passes through the lifting structure and is installed at the mounting panel bottom surface, turntable, and the transmission shaft top of turntable is clamped, is used for bearing commodity. The utility model, utilize magnetic coupler and connect power source output shaft and transmission shaft, realize zero contact transmission, reduce working noise, no contact transmission, can be convenient for operator to stop turntable rotation display details at any time, will not influence power source work, will not heat, through change driven magnetic ring and insert the depth of initiative magnetic ring, change transmission torque, can adapt to different weight commodity, transmission structure is simple and need not maintain.

This disclosure relates to a brush head and an electric toothbrush. The brush head is configured to be mounted on a body and includes a brush head body, a cleaning section, and a transmission section. The brush head body extends along a first axis and includes a sidewall defining a cavity. The cleaning section is attached to one end of the brush head body. The transmission section is at least partially disposed within the cavity and includes a first transmission member and a second transmission member. The first and second transmission members are connected by a connector and extend along the first axis. A first damping section is disposed between the first and second transmission members, and the first damping section is configured to contact the first transmission member and / or the second transmission member. The brush head provided by this disclosure, by providing a first damping section between the first and second transmission members, significantly reduces the operating noise between the first and second transmission members, thereby improving the user experience.

The present application relates to the technical field of steam humidifier, and discloses a noise reduction structure of steam humidifier convenient to install and a use method, the noise reduction structure of steam humidifier convenient to install, including installation ring, both sides of the installation ring are fixedly connected with lower side plate, the inside of the lower side plate is provided with clamping groove, the side of the installation ring is hingedly connected with upper cover, both sides of the upper cover are fixedly connected with upper side plate, the opposite side of two installation plates is fixedly connected with support rod, the outer wall of the support rod is symmetrically slidably connected with sliding block, the opposite side of two sliding blocks is fixedly connected with spring one, the outer wall of the sliding block is slidably connected in the sliding groove, and the bottom of the sliding block is fixedly connected with clamping block.Under the reaction force of spring one, the sliding block is away from each other along the support rod, drives the clamping block to be away from each other and is clamped in the clamping groove, without using a variety of tools, and the installation of the upper cover can be completed only by simple operation.

The utility model belongs to the technical field of stable transmission of middle motors of electric motorcycles, and particularly relates to a connecting mechanism for improving transmission stability of a middle motor of an electric motorcycle, which comprises a transmission rod, and a bottom plate is arranged at the bottom of the transmission rod; the top of the bottom plate is fixedly connected with a fixed block; a movable block is rotationally connected into the fixed block; the side wall of the movable block is fixedly connected with a first gear, and the side wall of the first gear is engaged with a transmission gear. A lifting block is fixedly connected between the two toothed belts; the interior of the lifting block is in threaded connection with a first lead screw. The torque motor is arranged to drive the lifting block, the clamping wheels are made to make contact with the side wall of the transmission rod respectively and extrude the transmission rod, finally the transmission rod is centered, the situation that the transmission rod is eccentric is avoided, the transmission effect of the middle motor of the electric motorcycle is improved, shaking is reduced, and meanwhile working noise is lowered.

The utility model relates to a connecting shaft type one-piece synchronous pulley, which aims at solving the technical problems of poor balance and stability, large noise, high production cost and inconvenience in installation and use due to the fact that few similar products adopt inner shafts as inner ring structural design of one-piece bearings. Equally-spaced teeth are arranged on the outer diameter of an outer ring wheel body of the conjoined synchronous belt wheel. The rolling wheel is characterized in that double rows of rolling needles, double rows of steel balls or a combination of one rolling needle and one steel ball are arranged between the inner diameter of the outer ring wheel body and the outer diameter of the inner shaft at equal intervals, the inner shaft is a connecting shaft concentric inner shaft or a connecting shaft eccentric inner shaft, and the centers of the two ends of the inner shaft extending out of the outer ring wheel body are provided with protruding installation columns with external threads respectively. Dustproof covers are respectively arranged at annular orifices formed by the two sides of the outer diameter of the inner shaft and the inner diameter of the outer ring wheel body in a flush manner; and the double rows of rolling needles, the double rows of steel balls or a combination of one rolling needle and one steel ball respectively correspond to two channels, two wide grooves or a combination of one channel and one wide groove of the inner diameter of the wheel body of the outer ring and the outer diameter of the inner shaft.

The invention belongs to the technical field of agricultural machinery and discloses an agricultural plastic mulching film row-aligning perforating machine which comprises a main machine frame, an unwinding mechanism, a perforating mechanism, a winding mechanism and a film unfolding mechanism. Through the unwinding mechanism, the punching mechanism, the winding mechanism and the film unfolding mechanism, the surface tension of a mulching film is maintained through a pre-tightening piece, the mulching film is conveyed to the punching mechanism under the assistance of the film unfolding mechanism, a gear motor drives a cutter shaft to rotate, a cylindrical brush cutting board shaft and the cutter shaft reversely rotate through a gear, and therefore punching operation of the mulching film is achieved; meanwhile, under the assistance of the film spreading mechanism, the mulching film is conveyed to the winding mechanism, the winding mechanism achieves winding and compacting of the mulching film through the dead weight of a rubber roller, a pressing piece and a winding rod, an optimized pure mechanical transmission structure is adopted, accurate alignment punching and winding and compacting of the mulching film and the crop row spacing are effectively achieved, and the mulching film and the crop row spacing can be effectively controlled. The device has the comprehensive advantages of compact structure, low manufacturing cost, high operation efficiency, excellent positioning precision and the like, and is suitable for large-scale agricultural production requirements.

The utility model provides a box-type house with good sound insulation and heat preservation effects, which comprises a wall plate, a photovoltaic power generation plate is arranged on the top of the wall plate, a square ventilation groove and a plurality of L-shaped ventilation channels are arranged on two sides of the wall plate, one side of the ventilation groove is communicated with the ventilation channels, and filter elements are fixedly connected in the ventilation channels. Ventilation fans are fixedly connected to the connecting positions of the ventilation groove and the multiple ventilation channels, the other side of the ventilation groove is fixedly connected with an outer side plugging assembly, one side of each ventilation channel is rotationally connected with an inner side plugging assembly, the outer side plugging assembly comprises a plugging plug, a sliding rod, an electric screw and a screw nut, and the motor end of the electric screw is installed on the inner side of the ventilation groove. Ventilation control is achieved through the remotely-controlled outer side plugging assembly and the manually-controlled inner side plugging assembly, when not in use, the plugging assemblies can be completely closed, air leakage is effectively prevented, the sound insulation and heat preservation effects of the box-type room are guaranteed, meanwhile, the ventilating fan is designed to be mute, and working noise is reduced.

The utility model relates to a motor vehicle license plate destroying device, and relates to the field of license plate destroying. According to the technical scheme, the feeding mechanism is arranged and used for conveying motor vehicle license plates to be destroyed; the shearing mechanism comprises a shearing rack located on one side of the feeding mechanism, an electric cylinder installed on the shearing rack, an upper cutter installed at the telescopic end of the electric cylinder and a lower cutter installed at the conveying tail end of the feeding mechanism, and the upper cutter corresponds to the lower cutter in position; the blanking port is used for leading out the destroyed motor vehicle license plate; the telescopic end of the electric cylinder is further provided with a number plate pressing base, the number plate pressing base is located on the side, close to the feeding mechanism, of the upper cutter, and the number plate pressing base is elastically connected with the telescopic end of the electric cylinder through a spring. Under the condition, the license plate destroying efficiency is improved, shearing destroying of various motor vehicle metal license plates with poor shapes such as deformation and damage can be compatible, the application scene is wide, maintenance is easy and convenient, and working noise is low.

The utility model relates to an integrated flow guide structure and a water pump applying the same, and solves the problems that the structure is complicated, the assembly size is difficult to control, axial movement occurs during working and the like in the prior art. According to the technical scheme, the water purifier comprises an inner cylinder, an outer cylinder and a flow guide cover arranged in an inner cavity of the inner cylinder, the inner cylinder and the outer cylinder are provided with center water inlet channels which are sequentially communicated, the inner cylinder, the flow guide cover and the outer cylinder are of an integrated structure, and a plurality of flow guide walls which are arranged in a centrosymmetric vortex mode are arranged on the inner side wall of the outer end of the inner cylinder. The flow guide cover is fixed to the flow guide wall in a buckled mode, the outer side wall of the flow guide wall and the outer side wall of the flow guide cover are the inner side walls of the flow guide channel, the inner side wall of the inner cylinder is the outer side wall of the flow guide channel, and a flow guide opening is formed in the side wall of the outer cylinder. The integrated flow guide structure has the advantages of being beneficial to structure simplification, convenient to produce, machine and assemble, beneficial to improvement of assembly reliability and sealing performance, beneficial to prevention of axial movement, beneficial to guarantee of hydraulic efficiency of the water pump and reduction of noise due to the adoption of the integrated flow guide structure.

The application discloses a light and efficient through-shaft type wheel hub motor, which comprises a through-shaft, a wheel hub shell mounted on the through-shaft, a machine core, a planetary reduction mechanism and a clutch which are sequentially assembled along the through-shaft, the clutch comprises an outer ring and an inner ring, the inner ring is fixed on the through-shaft, the planetary reduction mechanism comprises a sun gear arranged on an output end of the machine core and a plurality of planetary gears, the planetary gears are arranged on planetary shafts, the planetary shafts are fixed to the outer ring of the clutch, the sun gear is in transmission connection with a ring gear fixed to the inner side of the wheel hub shell through the planetary gears, and the planetary gears are double planetary gears, the double planetary gears comprise coaxially arranged large and small gears, the large gear is a plastic gear and is in mesh with the sun gear, the small gear is a metal gear and is in mesh with the ring gear, and an extension shaft sleeve is integrally arranged at the center of the small gear to fix the large gear. The through-shaft type wheel hub motor can ensure high output power and good internal structural strength under the premise of reducing weight, and the volume is further reduced.

The utility model discloses a high-noise-reduction chain type window opener, and belongs to the technical field of window openers. The high-noise-reduction chain type window opener comprises a shell, a chain body is arranged in the shell, a shell cover is arranged on the top face of the shell and comprises a cover body, a strip-shaped groove is formed in the bottom face of the cover body, a pressing roller is rotationally connected to the interior of the strip-shaped groove, a ball groove is formed in the bottom face of the interior of the shell, and the pressing roller is rotationally connected to the interior of the ball groove. Balls are rotationally connected into the ball grooves, and the two sides of the chain body make contact with the balls and the outer walls of the pressing rollers correspondingly. The driving machine box is installed at one end of the shell, sound insulation cotton is installed on the inner wall of the driving machine box, conical protrusions are arranged on the inner wall of the sound insulation cotton, the driving machine box comprises a box body, and a motor and a micro speed reducer are installed on the two sides of the interior of the box body correspondingly; and the output end of the motor is in transmission connection with the input end of the micro speed reducer.

This invention belongs to the technical field of workbench structure, specifically providing a drive structure for an exchangeable workbench. It includes a base with an internal drive cavity, a drive shaft rotatably mounted within the drive cavity, and several needle rollers arranged in a circumferential array fixedly connected to the drive shaft. A camshaft, capable of sliding up and down and rotating, is located within the drive cavity. A camshaft guide rail, cooperating with the needle rollers, is provided on the camshaft. The camshaft guide rail includes a lifting section, a rotating section, and a lowering section connected sequentially from end to end. The bottom of the drive shaft extends through the drive cavity and is fixedly connected to the output end of a drive device. The bottom of the camshaft extends through the drive cavity and into a damping buffer cavity. A buffer spring is fixedly connected to the bottom of the damping buffer cavity. A chuck at the top of the buffer spring is rotatably connected to a connecting plate at the bottom of the camshaft. A camshaft limiting assembly is also provided within the damping buffer cavity. The top of the camshaft extends through the base and is fixedly connected to the workbench. This structure is compact, reliable in operation, and has built-in buffer protection, enabling smooth movement of the workbench.

This invention relates to the field of wood processing technology and discloses an auxiliary feeding mechanism for wood processing, including a connecting base. Multiple connecting frames are connected to both the front and rear sides of the connecting base. An adsorption block is connected to one side of the front connecting frame, and a connecting electromagnetic block is connected to one side of the rear connecting frame. A circuit controller is connected to one side of the inner wall of the connecting base. Two sets of side chain assemblies are arranged opposite each other inside the connecting base, and a pushing hydraulic cylinder is connected inside the connecting base. This invention, through the cooperation of the adsorption block and the electromagnet, combined with a power connector, enables rapid mechanical and electrical connection of multiple units without tools, saving installation time and facilitating production line expansion or reorganization. Using an electric actuator to drive the relative rotation of adjacent magnetic supply platforms allows the transport track to be straight or curved, easily bypassing obstacles or adapting to irregular workshop layouts, eliminating the need for a dedicated turning platform and significantly saving floor space.

The electric toothbrush head and the electric toothbrush provided by the embodiment of the application relate to the technical field of electric toothbrushes, and the electric toothbrush head comprises a shell, a mounting cavity and a containing cavity, the containing cavity is communicated with the mounting cavity, a brush head assembly, a support and a bristle head, the support is fixedly installed in the mounting cavity, the support has a matching hole, the bristle head comprises a rotating connection part, a limiting part and a linkage shaft, the rotating connection part is rotatably matched with the matching hole, the limiting part is connected with the rotating connection part, and the linkage shaft is eccentrically arranged with the rotating connection part, a driving assembly, a push rod and an elastic piece, the push rod is movably arranged in the containing cavity, one end of the push rod is rotatably connected with the linkage shaft, the other end of the push rod is used for being matched with a main shaft, the elastic piece is arranged in the mounting cavity, and the elastic piece is used for driving the push rod to move in a direction away from the linkage shaft. The embodiment of the application can simplify the structural design of the brush head assembly, is beneficial to simplifying the assembly process of the electric toothbrush head, and reduces the cost of the electric toothbrush head.

The utility model discloses a kind of electric compressor for vehicle, air conditioning equipment and vehicle, electric compressor for vehicle includes: casing, driving component, orbiting scroll and static scroll, electric control cavity, low pressure cavity and high pressure cavity are equipped in casing, orbiting scroll and static scroll cooperate and jointly define compression cavity, static scroll is equipped with the vent hole being communicated with compression cavity, vent hole is communicated with high pressure cavity, orbiting scroll is adapted to rotate under the drive of crankshaft;Orbiting scroll includes disc body and orbiting scroll blade, orbiting scroll blade is equipped in the first surface of disc body, orbiting scroll blade is equipped with resonance cavity, resonance cavity includes first cavity and second cavity, and the cross-sectional area of first cavity is less than the cross-sectional area of second cavity, the inlet of first cavity is equipped in the inner end portion of orbiting scroll blade to be communicated with vent hole.Electric compressor for vehicle designed according to the utility model sets resonance cavity on orbiting scroll blade, to reduce the pressure pulsation level of discharge gas.

The present application provides a kind of vertical steering cam mechanism and profile curve generation method, belong to logistics automation technical field.For the problems of large pressure angle fluctuation, significant dynamic impact, design dependent experience and poor adaptability of high speed and high load of existing shuttle car vertical steering mechanism, the present application adopts kinematics reverse method, by constructing mathematical model, establishes global and cam motion coordinate system, sets rotation ratio n, guide rod length L and other parameters, analyzes cam-follower relative motion (coordinate translation and rotation transformation), generates cam groove track point cloud, calculates and controls pressure angle (peak value ≤45 °), completes optimization verification by combining three-dimensional modeling and dynamics simulation, realizes the accurate design of cam groove profile curve.The present application can make the shuttle car follower complete 90 ° steering stably, effectively inhibit the self-locking and dynamic impact of mechanism, shorten the design cycle, improve the operation reliability under high speed and high load working condition, meet the frequent vertical steering demand of automatic warehouse shuttle car.

The utility model relates to a through hole type conjoined synchronous pulley, which aims at solving the technical problems that the conjoined synchronous pulley with a bearing function is formed by arranging double rows of steel balls or roller pins between an outer sleeve and an inner sleeve which are less adopted as an outer ring and an inner ring of similar products. Equally-spaced teeth are arranged on the outer diameter of an outer ring wheel body of the conjoined synchronous belt wheel. The bearing is characterized in that double rows of roller pins, double rows of steel balls or a combination of one roller pin and one steel ball are arranged between the inner diameter of the outer ring wheel body and the outer diameter of the inner sleeve at equal intervals, the inner sleeve is a through hole concentric inner sleeve or a through hole eccentric inner sleeve, and at least one end of the inner sleeve extending out of the outer ring wheel body is provided with a through screw hole. Dustproof covers are respectively arranged at annular orifices of the outer ring wheel body on two sides of the outer diameter of the inner sleeve; protruding limiting parts are arranged on the end faces of the two sides of the equally-spaced teeth of the outer ring wheel body respectively, and the screw holes of the inner sleeve are arranged at 90 degrees or 120 degrees. The inner through hole type conjoined synchronous pulley is suitable for being used as an embroidery machine and other similar products.

The invention discloses a fruit and vegetable cleaning machine with an ozone function. The defects that in the prior art, the structure is complex, the size is large, an air pump is difficult to match with an ozone generator, ozone generation efficiency is low, ozone concentration in gas is low, and power consumption is high are overcome. According to the technical scheme, the vegetable washing machine comprises an electric control circuit, a vegetable washing machine shell, a washing basin and an ozone generator, wherein the ozone generator is an air pump type ozone generator. The generator shell is of a double-cavity structure composed of a pressure gas generating cavity and an ozone generating cavity, the ceramic piezoelectric vibrator is arranged in the pressure gas generating cavity, and the ozone generating piece is arranged in the ozone generating cavity. And an ozone exhaust port of the air pump type ozone generator is communicated with the inner cavity of the cleaning basin through a pipeline. The device has the advantages of being simple in structure, small in overall size, low in working noise, low in cost, high in ozone generation efficiency, good in cleaning effect, good in pesticide residue removal effect, low in power consumption and the like.

The application discloses a multifunctional mixer, which comprises a base, an installation cavity is arranged in the base, a wind inlet is arranged on the bottom wall of the installation cavity, a wind outlet is arranged on the side wall of the installation cavity, a soundproof cover and a heat dissipation base are arranged in the installation cavity, a driving element is arranged in the soundproof cover, the outer wall of the soundproof cover and the inner wall of the installation cavity form a first channel, the inner wall of the soundproof cover and the outer surface of the driving element form a second channel, the top end of the second channel is communicated with the top end of the first channel, a heat dissipation cavity is arranged in the heat dissipation base, the heat dissipation cavity is communicated with the bottom end of the second channel, the heat dissipation cavity is communicated with the wind outlet, a heat dissipation fan is arranged in the heat dissipation cavity, a cabinet is arranged, the cabinet is provided with a processing cavity and a through hole, the cabinet is arranged on the base, a cooking cup is detachably arranged in the processing cavity, a feeding opening is arranged on the cooking cup, a blocking assembly is arranged on the through hole, and the blocking assembly can move along the height direction of the through hole.

The utility model relates to an integrated cutter head assembly with a guide rail and a trimming tool, which are characterized in that a static cutter is in a sheet shape, a supporting piece with the width smaller than that of the static cutter is fixedly arranged on the bottom end face of the static cutter, and the two ends of the supporting piece cannot rotate and are detachably inserted into a static cutter holder to enable the static cutter and the static cutter holder to be connected into a whole; the movable cutter and the side wall of the supporting piece form point contact or line contact, so that the supporting piece forms guide limiting on the swinging direction of the movable cutter; in addition, a limiting mechanism for limiting the swing amplitude of the movable cutter and / or the movable cutter holder is further arranged in the supporting piece. The utility model has the beneficial effects that the static knife is arranged to be sheet-shaped, the support piece with the width smaller than that of the static knife is additionally arranged on the bottom end surface of the static knife, the support piece is coated outside the movable knife when the movable knife is mounted, so that the movable knife and the side wall of the support piece form point contact or line contact, a guide effect is formed on the reciprocating swing of the movable knife, and the limiting mechanism is additionally arranged on the support piece; therefore, the moving knife and / or the moving knife holder can be limited, and the moving knife and / or the moving knife holder can be effectively prevented from excessively swinging to collide with the static knife holder.

The utility model discloses a wearable device, relates to wearable device technical field, and the wearable device comprises a device main body and a heat exchange structure, the heat exchange structure comprises a semiconductor cooler and a first circulation flow path, the first circulation flow path is provided with a liquid storage tank, and is used for the circulation flow of liquid; the semiconductor cooler is provided with a first working end and a second working end which can transfer heat mutually, the first working end exchanges heat with the equipment body, and the second working end exchanges heat with the first circulating flow path. According to the technical scheme provided by the utility model, the heat dissipation efficiency of the hot end of the semiconductor cooler can be improved, and the working noise of equipment is reduced.

The utility model relates to the technical field of door industry, and discloses an up-down folding door which comprises an upper door frame and two side door frames, an upper door plate is hinged to the bottom of the upper door frame, a lower door plate is hinged to the upper door plate, vertical sliding frames are fixedly connected to the two side door frames respectively, and sliding parts are slidably connected into the two sliding frames respectively. The two sides of the lower portion of the lower door plate are fixedly connected with rolling wheels in sliding connection with the sliding frame respectively, the lower door plate below the rolling wheels is fixedly connected with a guiding part in sliding connection with the sliding part, and a driving mechanism is arranged on the door frame. The upper door frame is provided with a torsion spring mechanism used for lifting the lower door plate. When the sliding part moves upwards, the bottom of the lower door plate moves upwards to form a folded state, and when the sliding part moves downwards, the bottom of the lower door plate moves downwards and drives the upper door plate and the lower door plate to retract backwards to form a closed state on the same plane. The folding door is reasonable in structure, stable in operation, low in working noise, safe, reliable, long in service life, low in operation cost and free of frequent maintenance.

The utility model discloses a piezoelectric air pump with water purification and deodorization functions. The defects that the size and noise are large, the ozone generation efficiency is low, intermittent ozone generation and independent oxygen supply cannot be achieved and the like are overcome. According to the scheme, the piezoelectric air pump comprises a shell part, a piezoelectric air pump part, an air pump installation part, an ozone generation part and an electric control circuit part. The piezoelectric air pump part comprises an air pump shell, a ceramic piezoelectric vibrator, an air pump upper cover, an air pump lower cover, an air inlet control valve and an air outlet control valve. And the ozone generating sheet is arranged in an ozone generating cavity of the piezoelectric air pump part. And a pressure gas and ozone integrated structure is formed. The device has the advantages of being simple in structure, small in overall size, low in working noise, low in cost, high in ozone generation efficiency, good in sterilization, disinfection, water purification and oxygen supply effects, low in power consumption, capable of achieving simultaneous or independent oxygen supply of ozone and oxygen supply and the like, and is particularly suitable for cultivation of indoor aquatic plants.

This application relates to the field of wind turbines, and more particularly to a method for generating a volute profile, including obtaining a limiting height parameter and a base circle radius parameter; wherein the limiting height parameter is the height parameter of the mounting surface used for volute installation; determining the helix angle based on the limiting height parameter, the base circle radius parameter, and a preset distribution rule; wherein the preset distribution rule is the distribution rule of each cross-sectional point on the volute; determining the coordinate parameters corresponding to each cross-sectional point based on the helix angle and the preset distribution rule; generating the volute profile based on the coordinate parameters corresponding to each cross-sectional point; and outputting the volute profile. The helix angle of this application corresponds to the height of the wind turbine's mounting surface, thereby ensuring that the volute profile formed by the coordinate parameters corresponding to each cross-sectional point generated by the helix angle meets the height installation requirements on the wind turbine's mounting surface, guaranteeing the continuity of the volute's flow cross-sectional area change while also reducing volute operating noise and improving wind turbine efficiency.

The application provides a refrigerator and a compressor control method thereof, the compressor control method comprising: acquiring an operating parameter of the compressor; judging whether the compressor is in a low-speed high-load mode according to the operating parameter of the compressor; if the compressor is in the low-speed high-load mode, acquiring a set rotating speed of the compressor; judging whether the set rotating speed is greater than a first rotating speed; if the result of the judgment is yes, controlling the compressor to operate at the set rotating speed. The application has the advantage that the actual rotating speed of the compressor is reasonably adjusted, so that the working noise of the compressor is reduced, the operating loss of the compressor is reduced, and the service life of the compressor is prolonged.

This application relates particularly to the field of vehicles, and specifically discloses a linear motion drive device (1) comprising: a lead screw and nut mechanism (11) including a lead screw assembly (111) and a nut assembly (112); a driver (12) for driving the lead screw (1111) of the lead screw assembly (111) to rotate, thereby causing the nut (1121) of the nut assembly (112) to move linearly; and a buffer device (13) configured to drively couple the output end (121) of the driver (121) to the driven end (1112) of the lead screw (1111) in a manner that achieves motion buffering and noise reduction. A corresponding linear motion device is also disclosed. According to certain exemplary embodiments, it can significantly reduce operating noise, has a simple structure, and its modular design makes it easy to apply to different application scenarios.