41results about How to "Reduce resonance" patented technology

The invention provides an ultra-high-speed electric connector which comprises an insulating body, the insulating body is provided with a lengthwise slot, a plurality of terminal slots are formed in lengthwise side walls on the two sides of the slot respectively, and a fool-proof part is arranged in the slot and used for dividing the insulating body into a power supply and low-speed signal area and a high-speed signal area which are located on the two sides of the fool-proof part; the plurality of terminals comprise differential signal terminals distributed in the high-speed signal area and other terminals distributed in the high-speed signal area and the power supply and low-speed signal area, every two differential signal terminals are adjacent, and two sides of every two adjacent differential signal terminals are respectively provided with a grounding terminal; every two adjacent differential signal terminals and two grounding terminals located on the two sides of the two differential signal terminals form a terminal module, and the two differential signal terminals and the two grounding terminals of each terminal module and an insulating block inserted into the insulating body are formed in an embedded mode. The ultra-high-speed electric connector can enable signal transmission to be better and more stable.

The application discloses a kind of carbon ceramic brake pad for grinding carbon ceramic brake disc, belong to brake pad technical field, solve the poor heat dissipation performance of existing ceramic brake pad, insufficient connection strength, leading to the problem of poor friction performance, it includes carbon ceramic lining plate and the carbon ceramic friction surface installed on carbon ceramic lining plate, multiple mortise grooves are set on the upper surface of carbon ceramic lining plate, multiple tenon heads matched with mortise groove are set on the lower surface of carbon ceramic friction surface, tenon head is embedded into mortise groove and forms mortise and tenon structure, connects carbon ceramic lining plate and carbon ceramic friction surface, ear plate is set on the circumference of carbon ceramic lining plate, and mounting hole is formed in ear plate;In the application, the friction coefficient is adjusted by designing ceramic phase composition and density of carbon ceramic friction surface and carbon ceramic lining plate, and carbon ceramic lining plate and carbon ceramic friction surface are connected by RMI process and mortise and tenon structure to improve the mechanical properties of connecting place, ensure braking safety, reduce thermal stress generated in braking process, so as to improve the friction performance, effectively guarantee braking effect, and prolong service life.

An ultra-wideband end-fire antenna with a common aperture embedded in a metal carrier includes a metal cavity with a coaxial cable compartment on one side. A radiator module is connected to the bottom of the metal cavity via a radiator fixing slot. The radiator module includes a common aperture antenna substrate. A low-frequency radiator is printed on the side of the common aperture antenna substrate closer to the coaxial cable compartment, and a high-frequency radiator is printed on the side farther from the coaxial cable compartment. This invention utilizes a dual-band antenna in a common aperture design to enhance the channel capacity and anti-fading capability of the communication system. At the same time, by achieving the antenna's carrier conformal characteristics, high isolation, and miniaturization, it enriches the antenna's application scenarios and improves the overall performance of the communication system.

The invention provides a power assembly and a vehicle with the power assembly, the power assembly comprises an integrated shell and a stator rotating mechanism, the integrated shell is internally provided with a containing cavity, the containing cavity is internally provided with a motor shaft, a first motor unit and a second motor unit, the first motor unit and the second motor unit are both arranged on the motor shaft, and the stator rotating mechanism is arranged in the containing cavity. The first motor unit and the second motor unit are arranged in the axial direction of the motor shaft in a spaced mode. The stator rotating mechanism is connected with a stator of the second motor unit, and the stator rotating mechanism is rotatably arranged relative to the side wall of the containing cavity so as to adjust the stator angle of the second motor unit. By designing the stator rotating mechanism, the circumferential angle of the stator of the second motor unit is adjusted, and noise and resonance of the motor are reduced.

This utility model discloses a corrugated pipe with a noise reduction structure, relating to the field of corrugated pipe technology. It includes a corrugated pipe and a flow guide. The flow guide is disposed inside one end of the corrugated pipe. The outer wall of the flow guide gradually widens from one end to its opposite end, with the narrow end facing the end of the corrugated pipe without the flow guide. The flow guide is coaxially arranged with the corrugated pipe, and a gap is left between them for airflow. This utility model, by providing a flow guide inside the output end of the corrugated pipe, allows turbulent airflow within the corrugated pipe to impact the flow guide when it reaches the output end. This compresses the airflow, making its velocity uniform, and the airflow then exits through the gap between the flow guide and the inner wall of the corrugated pipe, reducing resonance noise. Furthermore, the gradual widening of the outer wall of the flow guide from one end to its opposite end provides flexible guidance, further improving the uniformity of airflow and thus reducing resonance noise.

This utility model discloses an air conditioner with a noise reduction device, comprising an outdoor unit; a bracket for fixing a main frame to a wall or base, and a secondary frame for supporting the outdoor unit; and a noise reduction mechanism including a shock absorber disposed between the secondary frame and the outdoor unit, a steel cable connecting the two secondary frames, and a counterweight suspended from the steel cable. This utility model provides an air conditioner with a noise reduction device. When the outdoor unit is operating, the vibration it generates is reduced by the shock absorber, thereby reducing the vibration of the secondary frame. When the secondary frame vibrates, the vibration is transmitted to the counterweight through the steel cable, causing the counterweight to sway, thus counteracting the vibration and further reducing it, thereby reducing resonance and lessening noise caused by vibration.

The application discloses a keyboard key and a computer keyboard. The keyboard key comprises a key cap body, the key cap body has a cavity with an opening facing downward, and an upper surface of the key cap body forms a knocking surface; a hard structure comprises a base and a sleeve downward protruding from the base, the sleeve has a sleeve hole with an opening facing downward; a soft structure comprises a base table and a connecting column downward protruding from the base table, an upper surface of the base table is connected to a bottom of the cavity, the base is fixedly connected with the base table, a main body part of the connecting column is embedded in the sleeve hole, and a cross connecting hole is arranged in the connecting column, and the cross connecting hole is connected with a cross connecting column of a keyboard shaft body. The keyboard key and the computer keyboard have the advantages that when each key is pressed, the hand feeling tends to be consistent, the knocking bottom sound, the resonance sound and the key cap cavity sound generated when rebounding are consistent.

This invention discloses a miniaturized four-channel combining module based on the TE20 mode, belonging to the field of millimeter-wave power combining technology. It includes a layered upper cavity, a mezzanine, a lower cavity, and an RF unit. The RF unit comprises a TE10-TE20 waveguide distributor, two amplification branches, and a TE20-TE10 waveguide combiner. Each amplification branch includes a TE20 mode filter, a waveguide-microstrip transition, a pair of amplifier chips, and a microstrip-waveguide transition connected sequentially. The TE10-TE20 waveguide distributor and the TE20 mode filter are disposed in the upper and lower cavities. The waveguide-microstrip transition, the pair of amplifier chips, and the microstrip-waveguide transition are disposed on opposite sides of the mezzanine. The TE20-TE10 waveguide combiner is disposed in the upper cavity, the mezzanine, and the lower cavity. This invention utilizes a high-isolation waveguide distributor / combiner to improve branch isolation, shorten the combining path, and has a compact overall structure with advantages such as wide bandwidth, high isolation, high combining efficiency, and miniaturization.

The application relates to the technical field of motor equipment, and discloses a high-overload three-phase brushless motor, which comprises a shell, a plurality of insertion grooves are formed in the side wall of the shell, a bolt is slidably connected in the insertion grooves, and a rotating shaft is rotatably connected in the shell. When the spring elasticity is used to reduce the gap and the running deviation of the rotating shaft, the situation that the rotating shaft and the magnetic steel are damaged or rubbed during the rotation process under the high-overload condition due to the excessively large gap formed between the rotating shaft and the surrounding structure under the high-overload condition can be reduced, the operation accuracy and stability of the equipment during the high-overload process are ensured, and the reliability of the equipment during the operation is improved.

The invention provides a wheel step type rotary drilling rig intelligent gait planning and cooperative control method and system, and the method comprises the steps: collecting the torque value of a drill rod, the rotation direction of the drill rod, the contact force deflection angle of each supporting leg steel claw, the leg vibration frequency, and the feeding speed and rotation speed of drilling operation; fourier transform is carried out on the torque value of the drill rod to obtain the torque fluctuation frequency of the drill rod; evaluating a phase angle between the rotation direction of the drill rod and the circumferential layout of the supporting legs, screening out leg positions with the phase angle exceeding a preset safety angle threshold value and vibration exceeding a limit, and adjusting the unfolding radius; identifying load concentration orientation distribution of each leg by taking the expansion radius adjustment amount of the supporting leg as an independent variable and the steel claw contact force deflection angle change rate as a dependent variable; gait scheduling arrangement, feeding speed and rotation speed are fused and optimized, a switching time window is divided according to the leg lifting and falling action period of each supporting leg, and feeding propulsion and rotation start-stop takt is matched in an alternating gap of adjacent supporting legs to form a cooperative control signal.

The utility model discloses an unfolding type support tree shaking vehicle, including car body, car swivel body, car turntable, support joint combination mechanism and oscillation pincers, support joint combination mechanism includes clamping bottom plate, joint drive mechanism, left support joint and right support joint, and left support joint and right support joint all include clamping support block, oblique joint, left auxiliary rod and right auxiliary rod, is equipped with left auxiliary rod drive mechanism for pushing left auxiliary rod away from self and right auxiliary rod drive mechanism for pushing right auxiliary rod away from self on oblique joint, is provided with support drive mechanism in oblique joint, left auxiliary rod and right auxiliary rod inside, and support drive mechanism is used for driving the close contact of directional support plate with ground, the utility model discloses through support joint combination mechanism clamping tree trunk and support on the ground, when the oscillation pincers shake tree trunk and pick fruit, have the effect of protecting tree root to stabilize the lower part of tree trunk, simultaneously, the oscillation pincers are suspended in car swivel body, and the resonance of car body is reduced, can effectively promote fruit to fall off and reduce tree trunk damage.

The invention discloses an underground coal transport vehicle, and belongs to the technical field of coal transport devices, the underground coal transport vehicle comprises a vehicle frame main body and a vehicle head suspension plate, the outer side of the top end of the vehicle head suspension plate is provided with a guardrail assembly, and the top end of the vehicle head suspension plate is provided with a cockpit side protection assembly; a storage assembly and an anti-seismic supporting assembly are arranged at the position, located in the cab side protection assembly, of the top of the vehicle head suspension plate, and a throwing hole is formed in the top of the vehicle head suspension plate. Through cooperative arrangement of the trigger trapezoidal columns and the limiting clamping tongues, when the cockpit top plate is impacted by collapse objects, serious deformation of the cockpit top plate can be prevented through the anti-seismic buffer springs, meanwhile, resonance caused by impact of the collapse objects is weakened, and when the collapse objects cause deformation of the cockpit top plate, the limiting clamping tongues can be pressed downwards through the trigger trapezoidal columns, so that the collapse objects are prevented from collapsing. The seat bearing platform is put into the escape bin formed in the platform enclosure, and a driver can obtain escape materials in the material storage cabinet by opening the cabinet body closing plate and escape in time by opening the escape protection plate.

The utility model discloses a receiver module of a hearing aid and the hearing aid. The receiver module can be connected with a main body of the hearing aid, and comprises an outer shell, a limiting inner shell, a sound production assembly, a quick-release fixing piece, a hose and an earplug, the sounding assembly and the limiting inner shell are arranged in the outer shell; the limiting inner shell half wraps the sound production assembly and is bonded with the sound production assembly. One end of the quick-release fixing piece is detachably clamped on the outer shell and is aligned with the sounding port of the sounding assembly, and the other end is detachably inserted with the hose; the end, away from the quick-release fixing piece, of the hose is detachably inserted into the earplug. The receiver module can provide a large degree of freedom for a user to replace or clean the hose and the quick-release fixing piece, and is beneficial to improving the user experience. And moreover, the hose can be detached from the quick-release fixing piece and can be freely cut to adapt to auricles of different sizes and shapes, so that the wearing comfort and stability of the hearing aid are improved, and the individual requirements of users are met.

The application provides a wind turbine jump speed control method, device, equipment and storage medium, and belongs to the field of wind power generation. The method is as follows: a plurality of first generator speed values and first generator torque values are obtained, and a plurality of first generator power values are calculated according to the obtained data; the plurality of first generator speed values, the first generator torque values and the first generator power values are respectively input into a filter to obtain a plurality of second generator speed values, second generator torque values and second generator power values; whether the wind turbine rotor rotation frequency range coincides with the first-order natural frequency of the flexible tower is judged according to the plurality of second generator speed values, the second generator torque values and the second generator power values; if yes, a target torque value, a minimum torque limit value and a maximum torque limit value are determined according to the first-order natural frequency of the flexible tower; and the generator speed is adjusted according to the generator speed isolation interval. The application can avoid resonance and improve the service life of the wind turbine.

The invention relates to the technical field of air storage air compressors, and discloses a high-stability air compressor for energy storage, which comprises a damping base and a damping assembly, a compressor is arranged on the inner wall of the damping base, and an air inlet pipe is fixedly mounted on the right side of the compressor; the damping assembly comprises a moving frame, an adjusting hole, a moving hole, an elastic telescopic rod, a limiting groove, an elastic telescopic plate, an elastic telescopic roller and a damping frame, the moving frame is fixedly installed at the bottom of the compressor, the adjusting hole is formed in the front side of the damping base, and the moving hole is formed in the front side of the moving frame. When the elastic telescopic plate is pressed to move downwards, the elastic telescopic plate is separated from the limiting groove and the limiting to the elastic telescopic rod is relieved, the triggering mode of pressing unlocking can prevent limiting failure caused by accidental touch in the daily operation process, and the design of automatic limiting after resetting can ensure that the elastic telescopic rod is stably locked; therefore, excessive vibration leakage caused by limiting falling during operation of the compressor is avoided.

The utility model discloses a loudspeaker test fixture with a sound short circuit hole, which comprises an imitated sound ear and an elastic pad, the upper wall of the imitated sound ear is concavely provided with a rectangular positioning groove, the imitated sound ear is provided with a test channel, the positioning groove extends towards the test channel to form a side wing, the middle part of the side wing is provided with a first sound test hole, and the middle part of the first sound test hole is provided with a second sound test hole. The side wing is provided with a second sound measuring hole penetrating through the wall face of the side wing, the first sound measuring hole and the second sound measuring hole are both located above the testing channel, the elastic cushion is matched with the positioning groove in shape, a first sound guiding hole is formed in the middle of the elastic cushion, a second sound guiding hole is formed in the wall face of the elastic cushion, the first sound guiding hole is in a circular shape, and the second sound guiding hole is in a circular shape. The second sound guide hole is in a sheet shape. The first sound hole and the second sound hole (namely the short-circuit hole) of the loudspeaker respectively extend into the first sound guide hole and the second sound guide hole, so that two sound channels can be tested by the imitated sound ear, the loudspeaker with the sound short-circuit hole can be tested by adding the jig to the existing imitated sound ear, and the structure is simple and stable.

The object of this invention is to reduce resonance between power modules even when switching timing deviations occur between multiple power modules connected in parallel. The power conversion device (90) of this invention includes a main circuit (91) with multiple power modules (1a, 1b) connected in parallel, and a drive circuit (92) driving the main circuit (91). The drive circuit (92) includes: a driver circuit (2) that generates control signals input to the respective control terminals (31a, 31b) of the multiple power modules (1a, 1b); and a filter (93) connected between the driver circuit (2) and the multiple control terminals (31a, 31b), and having a peak shape that increases impedance in a predetermined specific frequency band for each module group consisting of two modules (1a, 1b). The filter (93) has a coupling element (10) for each module group, which includes a capacitor (6) connected between two control terminals (31a, 31b).

A kind of bridge gantry machine side column stable shape structure, it includes a column body, the column body includes a combination part and a support part, the combination part has oppositely arranged a first inner surface and a first outer surface along a second direction, the distance between the first inner surface and the first outer surface defines a first width, the support part is integrally connected below the combination part, and the support part has oppositely arranged a second inner surface and a second outer surface along the second direction, the distance between the second inner surface and the second outer surface defines a second width, the second width is greater than the first width, the top edge of the second outer surface extends a slope towards the combination part and upwards;Thus, the utility model makes the width of the bottom of the column body greater than the width of the top by the setting of slope, so as to improve the overall structural strength, compared with the column of existing gantry type processing machine, better structural stability and good support effect are provided, and resonance generation can be reduced.

The present disclosure relates to a hanger for hanging a first drum and a second drum of a laundry treating apparatus, a side portion of the hanger including a connection portion for connection with a cabinet of the laundry treating apparatus, the connection portion having a support side for abutment with the cabinet, the support side having a length of 260mm or more to 300mm or less. The hanger can reduce or even avoid resonance of the hanger with the drum.

This utility model discloses a vibration-damping and noise-reducing silent heat sink, including a heat sink assembly, a fan, and a base plate. It also includes a vibration-damping connector and a flow guide shroud. The vibration-damping connector is made of an elastic material and has a ring-shaped structure, nested between the fan and the flow guide shroud. The flow guide shroud surrounds the air outlet side of the fan, and its inner wall has a spiral flow guide groove. The heat sink assembly includes multiple wavy, non-equidistantly arranged heat dissipation fins, forming a gradually expanding airflow channel. The bottom of the base plate has a honeycomb-shaped vibration-damping cavity filled with damping adhesive. The three-stage vibration-damping structure significantly reduces vibration transmission rate, reduces resonance, and extends equipment life. The spiral flow guide groove, sound-absorbing grille, and wavy fin phase difference design significantly reduce wind noise and structural noise.

The utility model relates to the technical field of vehicle empennage mounting structures, in particular to an electric empennage mounting structure and a vehicle. A hatchback door assembly of the electric tail wing installation structure comprises a hatchback door inner plate, a hatchback door outer plate and a reinforcing piece, the reinforcing piece is connected with the hatchback door inner plate in a welded mode, and an installation window is formed in the hatchback door outer plate; the driving assembly comprises a mounting part and a driving mechanism fixed on the mounting part, the mounting part is buckled on the mounting window, and the mounting part, the hatchback door outer plate and the reinforcing part are sequentially laminated and then are fastened and connected through bolts; the electric tail wing is arranged on the side, away from the hatchback door inner plate, of the hatchback door outer plate, and the electric tail wing is connected with the driving assembly. The rigid supporting capacity of the hatchback door in the electric empennage installation area is effectively improved, the resonance problem caused by structure weakening is avoided, noise and vibration in the vehicle running process are reduced, and the whole vehicle performance and riding comfort are improved.

This invention discloses a cover plate for a drive assembly housing, a drive assembly having the same, and a vehicle. The drive assembly housing includes a lower housing and a cover plate. The lower housing has a mounting opening, and the cover plate closes onto the mounting opening. The cover plate includes a central arched area and a mounting area. The mounting area is an annular structure surrounding the central arched area and is used to contact and connect with the lower housing. The central arched area includes multiple curved panel areas that arch from the periphery towards the center in a direction away from the mounting opening. The electronic control cover plate of this application, by setting the central arched area and the mounting area, can increase the modulus of the electronic control cover plate and increase its natural frequency to a certain extent. This makes the natural frequency of the electronic control cover plate far away from the external excitation vibration frequency caused by the vibration of the drive motor, thereby reducing the resonance between the electronic control cover plate and the drive motor, reducing vibration and noise during drive assembly operation, and reducing resonance fatigue of the drive assembly structure.

This invention discloses an air supply device assembly, including an air duct assembly and an air outlet assembly for generating airflow. The air duct assembly includes a front frame, a middle frame, and a rear frame for forming the air duct. The rear frame forms an air inlet on one side of the middle frame, and the front frame forms an air outlet on the other side of the middle frame. The middle frame is closed around the air duct, and a funnel-shaped air guide portion is formed on the middle frame corresponding to the air inlet. Multiple air guide grooves are formed on the air guide portion in the circumferential direction. The air guide grooves are arranged with respect to the airflow path. The air guide portion and the air guide grooves limit the airflow path in the air duct and constrict the airflow at the air outlet, thereby increasing the air outlet effect.

This utility model discloses a noise-reducing directional speaker, including a cabinet. The inner cavity of the cabinet is provided with a sound-insulating panel, and the inner cavities of the cabinet and the sound-insulating panel are respectively provided with a first sound-insulating layer and a second sound-insulating layer. Speakers are symmetrically arranged within the inner cavity of the sound-insulating panel. This utility model relates to the field of speaker technology. This noise-reducing directional speaker effectively reduces noise by precisely controlling sound propagation within a certain area and at a 15° angle, thus solving the noise interference of traditional campus broadcasting systems on nearby residential buildings, offices, teaching buildings, etc., ensuring teaching quality and creating a quiet environment.

The present disclosure relates to a packaged filtering antenna, comprising at least one filtering antenna unit, each filtering antenna unit comprising: a dielectric substrate layer, an antenna radiation patch arranged on a first end surface on top of the dielectric substrate layer, an antenna feed point arranged on a second end surface on the bottom of the dielectric substrate layer, and an absorption type filter arranged in the dielectric substrate layer, an input end of the filter corresponding to the antenna feed point in a Z-axis direction perpendicular to the dielectric substrate layer and being connected by a third group of metallized blind holes; and an output end of the filter corresponding to a second radiation patch hole disc in the Z-axis direction and being connected by a second group of metallized blind holes. The packaged filtering antenna of the present disclosure forms a vertical cascade between the antenna feed point and the filter input end, and between the filter output end and the antenna radiation patch, and integrates the antenna and the filter in the vertical direction, thereby effectively reducing the size of the filtering antenna in a two-dimensional plane, and having the performance of filtering, signal radiation and interference signal absorption.

The utility model belongs to the technical field of air compressor accessories, and provides a heat exchanger installation structure which comprises an installation frame, a heat exchanger body arranged on the installation frame and a fixing piece connected with the heat exchanger body and the installation frame. The fixing piece comprises a first connecting part, a holding part and a second connecting part which are connected in sequence, the first connecting part is connected with the mounting frame, the holding part wraps the surface of the heat exchanger body, the second connecting part and the bearing face are oppositely arranged in a spaced mode, and the second connecting part and the bearing face are detachably connected through a fastener. According to the heat exchanger installation structure, the installation frame and the fixing piece are arranged, so that the heat exchanger can be installed flexibly, conveniently and rapidly; the heat exchanger can be fixed more firmly through the enclasping part of the fixing piece, the second connecting part is matched with the locking force of the fastening piece so that the heat exchanger body can be firmly fixed to the mounting frame, resonance generated by the heat exchanger in the operation process of the air compressor is reduced, and the heat exchanger can operate stably and quietly.

The utility model discloses a kind of cable protection pipe with auxiliary support structure, it is related to cable protection pipe technical field, the utility model includes pipeline main body, and the bracket is connected with the buffer sleeve in pipeline main body top, and buffer sleeve outside is provided with adhesive layer, and the support strip is connected in the bracket bottom.The utility model is fixed in advance by the setting of bracket in the process of cable protection pipe production, and bracket is used as support structure, so in subsequent transportation and placing process, the flatness of bracket bottom makes that pipeline main body is not prone to rolling phenomenon, even if rolling also cannot roll very far, stability is better compared with traditional cylindrical cable protection pipe;And when subsequent installation, compared with traditional first through bolt pipeline main body and support structure assembly, then through expansion bolt etc. Fastening structure is fixed to ground or wall;Conveniently support pipeline main body, avoid rolling, and improve installation efficiency to some extent.

This utility model relates to an unequally divided rotary milling cutter head in the field of rotary milling cutter head technology. It includes a cutter head body with multiple sets of tool slots. The included angle between adjacent sets of tool slots is different. Each set of tool slots includes two grooves symmetrical about the center of the cutter head body. A tool clamp is installed in each groove and is fixed to the groove by fixing screws. The fixing screws are inclined, forming an acute angle with the cutter head body. This utility model allows for adjustment of the tool clamp precision before installation, improving installation efficiency and overall accuracy. The overall structure is reasonable, reducing vibration generated by the cutter head body during high-speed rotary cutting, reducing resonance, and facilitating use.

The utility model discloses a plastic particle melting and plasticizing device, which relates to the technical field of plastic particle melting and comprises a screw extruder, a feed hopper is fixedly mounted on the screw extruder, and an elastic connecting piece is fixedly mounted at the upper end of the feed hopper. The elastic connecting piece is composed of a corrugated connecting pipe, two hard connecting frames, connecting lugs, a guide rod, an anti-falling baffle and a supporting spring, the two hard connecting frames are fixedly installed at the upper end and the lower end of the corrugated connecting pipe respectively, and the multiple connecting lugs are symmetrically and fixedly installed on the end faces of the two hard connecting frames; the four guide rods are slidably mounted on the two connecting lugs which are symmetrically arranged up and down, the multiple anti-falling baffles are fixedly mounted at the upper ends and the lower ends of the guide rods correspondingly, and through the synergistic effect of the vibration assembly and the beating assembly, caked plastic particles can be effectively crushed, blockage of the plastic particles in the feeding process is prevented, smooth discharging is guaranteed, and the service life of the plastic particles is prolonged. The blockage probability is reduced, equipment abrasion is reduced, the maintenance cost is reduced, and the production efficiency is improved.

This invention belongs to the field of ultrasonic sensing and microelectromechanical systems (MEMS) packaging technology, specifically relating to a multi-segment acoustic packaging structure and optimization method for a PMUT ultrasonic transducer. The multi-segment acoustic packaging structure for a PMUT ultrasonic transducer includes a base, a PMUT chip, and an acoustic cavity. The acoustic cavity includes a front cavity section, a tapered transition section, a conduit section, and a waterproof and acoustically permeable membrane. A first minimum gap is formed between the radiating surface of the PMUT chip and the bottom surface of the front cavity section; a second minimum gap is formed between the waterproof and acoustically permeable membrane and the outlet end of the conduit section. Furthermore, the acoustic cavity serves as either a transmitter or a receiver. When used as a transmitter, the depth of the front cavity section is greater than that of the front cavity section when used as a receiver, and the inner diameter of the conduit section is smaller than that of the conduit section when used as a receiver. This packaging structure, through optimization of geometric parameters and acoustic characteristics, achieves differentiated performance improvements for the transmitter and receiver, increasing the transmitted sound pressure and directivity, and expanding the bandwidth and receiving angle of the receiver.