165 results about "Piezoelectric beam" patented technology

A diaphragm air pump comprises a pump chamber, a diaphragm and one or more piezoelectric beams or bimorphs. Fluid flows into the pump chamber and then flows out of it, the diaphragm is provided within the pump chamber, and one or more central openings are formed in the diaphragm. One or more central check valves are provided in the central openings. The diaphragm is just bonded with piezoelectric beams, not fixed to the lower housing of the pump chamber in order to get large displacement. With the provided diaphragm air pump, it is possible to actively adjust the air quantity according to the requirement for fuel cell or a part-to-be-cooled, and it is also possible to reduce noise and power consumption compared with a conventional fan type cooler or air pumps.

A multi-axis accelerometer or a multi-axis angular rate sensor which can be made by an easy process and the size of which can be greatly reduced is provided. An inertia sensor has a substrate, a flat proofmass formed on the substrate and a stacked structure including at least a lower electrode, a piezoelectric film, and an upper electrode, an anchor unit formed in a cutout inside of the proofmass and fixed on the substrate, and a plurality of flat piezoelectric beams each having one end connected to the proofmass, the other end connected to the anchor unit, and a stacked structure formed in a cutout inside of the proofmass and including at least a lower electrode, a piezoelectric film, and an upper electrode, wherein the inertia sensor enables to detect an acceleration applied on the proofmass based on charges generated to the electrodes of the piezoelectric beams.

A piezoelectric drive motor especially well adapted for use with flow control systems on commercial aircraft, military aircraft and spacecraft. In one embodiment, the apparatus includes a support structure that supports a piezoelectric beam. A biasing element, for example a coil spring, is coupled between a free end of the piezoelectric beam and the support structure. The spring exerts a compressive force on the beam and serves to amplify its displacement when electric signals applied to piezoelectric layers on the beam cause deflection of the beam between two stable positions. The drive motor operates over a wider band of drive frequencies than conventional piezoelectric beams and is also suitable for use as a sensor and in a wide variety of actuator applications.

The invention discloses a rotary piezoelectric generation device, which comprises a rotary shaft, a front excitation wheel, a rear excitation wheel and a piezoelectric twin-crystal beam array, wherein the piezoelectric twin-crystal beam array is arranged between the front excitation wheel and the rear excitation wheel; the front excitation wheel and the rear excitation wheel respectively comprise a wheel disk and excitation permanent magnet blocks; the excitation permanent magnet blocks of the front excitation wheel and the rear excitation wheel are staggered spatially; the piezoelectric twin-crystal beam array comprises hubs and piezoelectric twin-crystal beams; each piezoelectric twin-crystal beam comprises a cantilever beam; a piezoelectric ceramic wafer and a piezoelectric beam permanent magnet block are respectively arranged on a beam body of each cantilever beam; and permanent magnet repulsive force can be respectively formed between the piezoelectric beam permanent magnet blocks and the excitation permanent magnet blocks of the front excitation wheel and the rear excitation wheel. Therefore, by rotation of the rotary shaft, the two excitation wheels alternately apply repulsive force to the piezoelectric twin-crystal beams of the piezoelectric twin-crystal beam array, high frequency is generated, and high forced deformation is caused, so the rotation energy of the rotary shaft is effectively utilized.

A piezoelectric energy captor enabling to capture energy and store energy effectively consists of piezoelectric beam formed by two layers of piezoelectric ceramic plates and intermediate sandwich layer, electrode prepared by plating metal silver on ceramic plate, inductance coil with control switch, bridge type of rectifier, rectifying capacitor, Cuk type of dc-dc converter formed by transistor switch and electric inductance as well as diode, filtering capacitor for stabilizing charge current, and energy storing battery.

Provided are an electric power generating apparatus for a movement type equipment and a self-generation system having the same. The electric power generating apparatus for a movement type equipment includes: a piezoelectric beam having an end fixed to a movement type equipment and other end with a mass; and a rectifier unit for rectifying and storing electric energy generated due to deformation of the piezoelectric beam. The self-generation system includes: a movement type equipment; and an electric power generating apparatus for a movement type equipment including a piezoelectric beam having an end fixed to a movement type equipment and other end with a mass, and a rectifier unit for rectifying and storing electric energy generated due to deformation of the piezoelectric beam. According to the electric power generating apparatus for the movement type equipment and the self-generation system having the same, since external movement is converted into vibration perpendicular to an electric beam using elasticity of the electric beam and load applied to an end of the beam, continuous vibration is induced to the piezoelectric beam. Also, high energy conversion efficiency can be obtained by using resonance.

The invention discloses a cylindrical vortex-induced vibration generation device with a built-in piezoelectric beam, and relates to a generation device which is an electromechanical conversion device used for converting flow-induced vibration generated by fluid flowing around a bluff body into electric energy. The generation device comprises a cylinder, piezoelectric wafers, a metal sheet and a support structure, wherein the piezoelectric wafers are pasted on the two surfaces of the metal sheet to form a double-wafer piezoelectric beam arranged inside the cylinder, the plane piezoelectric beam is parallel to the axial direction of the cylinder and the direction of incoming flow, the piezoelectric cantilever beam is driven to vibrate by the periodic vibration of the cylinder due to vortex shedding formed by the fluid flowing around the cylinder, the base can be fixed at the bottom of sea and river or on the pipe wall of water flow pipeline and air flow pipeline, so that the kinetic energy of the fluid can be converted into the electric energy. The device is simple in structure and can start at a low flow rate.

The invention relates to a wheel-type piezoelectric beam generator based on the clamping limit, which belongs to the technical field of new energy and power generation. A left end cover and a right end cover are installed on a shell through screws, and a limiting ring A and a bearing are respectively embedded in the bottoms of the left and the right end covers; the shell is provided with an annular disc for installing the limiting ring; a piezoelectric oscillator is pressed respectively between the left end cover and the shell and between the right end cover and the shell, the other end of the piezoelectric oscillator is clamped between the limiting rings, and the free end of the piezoelectric oscillator is provided with a movable magnet; and an excitation disc rotating shaft is installed on the left and the right end covers through a bearing, and a fixed magnet is embedded on an excitation disc body. The wheel-type piezoelectric beam generator has the advantages that the excitation disc is maintained relatively still by utilizing the centre-of-gravity shift characteristic, so that the fixed magnet which is installed on the excitation disc rotates relatively to the movable magnet which rotates along the piezoelectric oscillator, the piezoelectric oscillator is driven to generate the power, and no external fixed support is needed; the blade structure is unnecessary to change in the use, and convenience in installation and maintenance can be realized; and the piezoelectric oscillator is limited by the limiting rings, so that the reliability is high, and the effective velocity zone is wide.

The invention discloses a combined type broadband vibration energy collector. The combined type broadband vibration energy collector comprises a shell, a piezoelectric beam, two mass blocks, two coils and two magnets, wherein the piezoelectric beam, the mass blocks, the coils and the magnets are arranged in the shell; one end of the piezoelectric beam is horizontally fixed to the inner wall of the shell, and the other end of the piezoelectric beam is a free end; the two mass blocks are fixed to the upper surface and the lower surface of the free end of the piezoelectric beam respectively; the two coils are fixed to the two mass blocks respectively, and the axes of the coils are perpendicular to the upper surface and the lower surface of the piezoelectric beam; the two magnets are fixed to the inner wall of the shell, like poles are opposite, the magnets and the coils are coaxial, and a gap exists between each magnet and the corresponding coil. The combined type broadband vibration energy collector combines a piezoelectric type vibration energy collector with an electromagnetic type vibration energy collector, energy collection efficiency is improved, the magnets serve as stators installed on the shell, and the reliability of the combined type broadband vibration energy collector is improved; meanwhile, the amplitude of the coils is limited by the magnets, so that the broadband of a frequency band is expanded.

The invention provides a mini electric field sensor with double-clamped piezoelectric beams. The sensor comprises a pedestal and a sensor sensitive structure, wherein the sensor sensitive structure is formed on the pedestal and includes the multiple double-clamped beams of a grid structure. The sensor of the invention has the advantages of simple structure and small size.

The invention discloses a double-piezoelectric beam driven diaphragm pump, belonging to the technical field of micro fluid pump in precision machinery, comprising a cavity, two double-piezoelectric beams, a diaphragm with one-way valve and electrodes, where one end of each double- piezoelectric beam is fixedly supported and the other end is connected with the side of the diaphragm, an AC voltage is applied on the double- piezoelectric beams in the cavity to drive the diaphragm to vibrate at resonance point, and under the action of the one-way valve on the diaphragm, the air flows in a direction to exchange with external gas. And it has many advantages of simple structure, large output flow, low power consumption, small size of side surface, no electromagnetic noise, fewer active parts, high reliability, etc, easy to spread and apply.

The invention provides a two-degree-of-freedom piezoelectric driving device and an excitation method thereof, and belongs to the field of piezoelectric driving. The two-degree-of-freedom piezoelectricdriving device comprises four groups of identical piezoelectric beams, a substrate, a driving foot base and a driving foot. The two-degree-of-freedom piezoelectric driving device is simple in structure, and easy to manufacture. Each piezoelectric beam comprises two piezoelectric ceramic pieces and a metal baseplate. When a voltage excitation signal is applied to the piezoelectric beams, bending motion of the piezoelectric beams along the thickness direction can be realized. Through design of the voltage excitation signal for the four groups of piezoelectric beams, the direction and time sequence of the bending motion of the piezoelectric beams are controlled, and the driving foot is excited to realize two-degree-of-freedom swinging. Furthermore, friction force is taken as driving force for driving a mover to realize two-degree-of-freedom motion. The two-degree-of-freedom piezoelectric driving device provided by the invention has the advantages of simple structure, low cost, high displacement resolution and large stroke, and has wide application prospects in the fields of ultra-precision driving, positioning and the like.

The invention discloses a combined-type magnetic suspension wideband vibration energy collector employing an amplification structure. A rectangular frame (1) is designed, one end of a strip-shaped piezoelectric cantilever beam (2) is fixed on a vertical edge of the frame (1), and the upper surface of the other end of the strip-shaped piezoelectric cantilever beam (2) is fixedly provided with a magnetic suspension vibration energy collection module (5). The lower surface of the piezoelectric cantilever beam (2) is fixedly provided with a piezoelectric beam magnet (4). A horizontal edge of the frame below the piezoelectric beam magnet (4) is fixedly provided with a frame magnet (3), and the frame magnet (3) is opposite to the piezoelectric beam magnet (4), wherein there is an interval between the frame magnet (3) and the piezoelectric beam magnet (4). The magnetic suspension vibration energy collection module (5) is a cylinder which is made of a non-magnetic-conduction material. The upper part of the interior of the cylinder and the bottom of the cylinder are respectively provided with fixed magnets (5-1, 5-4) in a fixed manner, and a movable magnet (5-3) is configured between the two fixed magnets (5-1, 5-4). The outer wall of the cylinder is provided with two induction coils (5-2), and the movement of the movable magnet (5-3) in the cylinder can generate electricity in the induction coils (5-2) for output.

The invention discloses a damping device for a beam-array-shaped periodical piezoelectric composite structure. According to the structure of the damping device, multiple layers of piezoelectric beam arrays and multiple layers of metal beam arrays are alternately stacked; the adjacent layers are fixedly connected through insulating plates; and all piezoelectric beams are connected with shunt circuits to form loops, wherein each shunt circuit is formed in a manner that an inductor and a resistor are connected in series. The invention further provides a damping optimizing method based on the above device, the resistance value is gradually increased from zero, and meanwhile the inductance value is determined according to circuit parallel resonance conditions. The attenuation effect of vibration is gradually enhanced along with increasing of the resistance, the frequency response curve of the damping device is overall lowered along with increasing of the resistance, and parameters of the shunt circuits become the optimal tuning parameters till the frequency response curve peak of the damping device becomes the minimum. By means of the device and the method, an isolation effect is achieved on excitation in the horizontal direction / perpendicular direction due to frequency forbidden band characteristics, low-frequency excitation in the transverse x3- direction can be adjusted in real time through the shunt circuits, and therefore the vibration inhibiting function is achieved.

The invention discloses a plane vibration double-helix piezoelectric transducer based on a MEMS, and relates to a transducer, in particular to a plane vibration double-helix piezoelectric transducer based on micro-electromechanical system (MEMS) technology, which is mainly applied to low-frequency vibration energy collection in an environment, and also can be applied to an inertial sensor, an accelerometer, a gyroscope, an actuator and the like. The plane vibration double-helix piezoelectric transducer based on the MEMS is provided with a shell, a PZT piezoelectric film, two groups of large mass blocks, two pairs of electrodes and a pair of terminals. The transducer vibrates in a plane to collect mechanical energy generated by vibrating in the plane; a double-helix piezoelectric beam type structure and a piezoelectric device in a d31 working mode can generate large electromechanical coupling characteristics; a novel and reliable electrode structure can be synchronously used for polarization and conduction, and electrodes are in series output; and the transducer manufactured by adopting the MEMS technology and being compatible with silicon processing technology is easy to integrate with a sensor based on the MEMS technology.

The invention provides an MEMS vibration energy collector based on a PZT piezoelectric beam array. The MEMS vibration energy collector is composed of a plurality of PZT piezoelectric beams, a mass block and an outer frame. Each PTZ piezoelectric beam comprises a silicon substrate, a lower electrode, a PZT piezoelectric film and an upper electrode. One ends of the piezoelectric beams are fixed on the outer frame. The other ends of the piezoelectric beams share the mass block. The piezoelectric beams are arranged to be an array in the width direction. Gaps are formed between the adjacent piezoelectric beams. The PZT piezoelectric beams are in series connection through metal wires. Currents are output by two welding points. With the structure, the MEMS vibration energy collector has the advantages that due to the fact that the PZT piezoelectric beam array shares the mass block, the resonant frequency and the vibration phase of the structure can be the same, and the output voltage can be increased due to the direction series connection; due to the fact that the gaps between the adjacent piezoelectric beams, air damping of the structure can be reduced, and the vibration amplitude is increased; due to the fact that the area of the single piezoelectric beam is small, the rate of finished products of devices can be improved. The MEMS vibration energy collector is small in size, high in output voltage and particularly suitable for supply power to wireless sensor network nodes.

A piezoelectric energy harvesting system for converting mechanical energy of a tire of a vehicle to electrical energy includes sets of piezoelectric beam assemblies, a tire electrical jack, a conductive bearing, and an electrical storage unit. The sets of piezoelectric beam assemblies are embedded in multiple layers of the tire of the vehicle and electrically connected in a parallel configuration. Each of the sets of the piezoelectric beam assemblies are electrically connected in a series configuration for converting mechanical strains into electrical energy. The tire electrical jack is mounted on a rim of the tire and receives the electrical energy generated by the sets of piezoelectric beam assemblies via output terminals. The conductive bearing transmits the electrical energy received by the tire electrical jack to the electrical storage unit, which filters, rectifies, adapts and stores the transmitted electrical energy for powering components of the vehicle.

The invention discloses a both-end clamped piezoelectric beam vibration detection and control device based on a non-contact type sensor. The both-end clamped piezoelectric beam vibration detection and control device comprises a flexible beam body, a vibration excitation part, a vibration detection part and a vibration control part. According to the vibration excitation part, a modal vibration signal is generated through a signal generator and is amplified through a first piezoelectric drive amplifying power source, then a piezoelectric excitation driver excites the flexible beam body to vibrate. According to the vibration detection part, vibration of the flexible beam body is detected through a laser detection head and a piezoelectric ceramic piece sensor and transmitted to a computer through a laser displacement sensor controller and a charge amplifier. According to the vibration control part, a control signal of the computer is amplified through a second piezoelectric drive amplifying power source, the controlled quantity is applied on a piezoelectric ceramic piece driver, and the purpose of active control over vibration of a both-end clamped piezoelectric beam is achieved.

The device includes an energy harvesting module with a pendular unit formed of an elastically deformable piezoelectric beam associated with an inertial mass. A multifunction part includes an axial through-recess with inner bearing surfaces opposite respective outer faces of the beam. These bearing surfaces having an increasing transverse spacing, such as, during an oscillation cycle, the beam comes into contact with one of the bearing surfaces, hence reducing the free length of the beam as the bending of the latter goes along. The multifunction part also allows rationalizing the manufacturing and the assembly of the capsule, with high-level integration of the inner components of the implant.

The invention relates to a piezoelectric energy harvesting and active vibration reduction integrated set comprising a plurality of inner sleeves (1), a plurality of outer sleeve (6) and an electrical control module. The inner sleeves (1) sleeve in order the outer wall of an inner cylinder (5); each inner sleeve (1) is composed of an inner sleeve base (2) and a plurality of piezoelectric beams (3) peripherally mounted on the inner sleeve base (2), and permanent magnets (4) are disposed on the piezoelectric beams (3). The outer sleeves (6) are mounted in order on the inner wall of an outer cylinder (7); each outer sleeve (6) is composed of an outer sleeve base (6) and electromagnets (9), and the electromagnets (9) are embedded in the outer sleeve base (8). The piezoelectric beams (3) and the electromagnets (9) are electrically connected with the electrical module separately. The problems that the existing piezoelectric energy harvester is low in harvesting efficiency, low in energy harvesting and vibration reduction functional integrity and large in size are solved; the piezoelectric energy harvesting and active vibration reduction integrated set is compact in structure, energy saving and reliable.

The invention relates to an intelligent channel flow monitor based on a piezoelectric beam and belongs to the fluid monitoring field. An inner wall of a channel is equipped with a flow-disturbing body and an inner cylinder, wherein two ends of the inner cylinder are equipped with end covers, the left end cover is equipped with a sensor and a circuit board, a pin is sleeved in a center hole of the left end cover, two ends of the pin are sleeved with springs, the left end of the pin is equipped with an exciter, the right end of the pin is welded with a left side board, an outer rim of the left side board is sequentially equipped with separator boards and a right side board, metal substrates are respectively crimped between the left and right side boards and the separator board and between two adjacent separator boards, cantilever beams on the substrates and piezoelectric wafers are bonded to form piezoelectric oscillators, end portions of the piezoelectric oscillators are equipped with mass blocks, and one sides of the left and right side boards and two sides of the separator boards are provided with limit faces and sinking grooves. The monitor is advantaged in that power generation and flow velocity self measurement are simultaneously realized by utilizing the coupling effect, and real flow velocity online monitoring can be realized; the monitor is configured along the length direction of a pipeline, the structure of the monitor is simple, the radial scale is small, and the required energy and bandwidth can be easily acquired through the multiple piezoelectric oscillators; the piezoelectric oscillators are reasonable in structure, and properties of large power generation capacity and high reliability are realized.

The invention relates to a piezoelectric beam and capacitor combined type bidirectional energy collection device with a bistable feature and belongs to the field of micro electromechanical systems and energy technology. An outer end of a piezoelectric energy acquisition unit 1 is fixedly connected with a base body. An outer end of a piezoelectric energy acquisition unit 2 is fixedly connected with the base body. The inner end of the piezoelectric energy acquisition unit 1 and the inner end of the piezoelectric energy acquisition unit 2 are connected with an electricity collection device which is not in contact with the base body and in a floating state. A static electricity energy acquisition unit 1 and a static electricity energy acquisition unit 2 are symmetrically fixed on two sides of the base body. The energy collection device is advantaged by novel structure, quite small size and capability of achieving a superposition and amplification effect on output energy. Each piezoelectric energy acquisition unit consists of a bistable state beam, an electricity collection device and a bistable state beam series connection structure, so frequency domain of acquisition energy is extended. An electret thin film is connected with the base body through spandex filaments with high elasticity, so energy conversion area of the electret thin film can be increased and energy conversion rate is improved.

The invention relates to a suspension self-excitation runner piezoelectric beam energy harvester and belongs to the field of piezoelectric power generation. A left end cap, a disc body, a side plate and a right end cap are sequentially connected and are arranged on a cantilevered shaft in a sleeving mode. A cantilever beam of a metal substrate and a bonded piezoelectric crystal plate between the left end cap and the disc body form a piezoelectric vibrator, and a cantilever beam of a metal substrate and a bonded piezoelectric crystal plate between the side plate and the right end cap form a piezoelectric vibrator. The piezoelectric vibrators are provided with excited magnetics. An exciter is mounted in a slideway form by the cantilevered shaft and an annular cavity of the disc body. Balls are embedded in the inner edge and the outer edge of the exciter, and exciting magnets are embedded in the two sides of the exciter. The piezoelectric vibrators on the two sides of the exciter are equal in number and are symmetrically mounted. The side of the left end cap, the side of the disc body, the side of the side plate and the side of the right end cap which are adjacent to the piezoelectric vibrators are provided with limiting faces and sink grooves which are identical in shape, size and number. The suspension self-excitation runner piezoelectric beam energy harvester has the advantages and characteristics that fixing and supporting are not needed, structure is simple, and rotation force to the exciter is small; the piezoelectric vibrators are reasonable in structure and equal in stress of points after deformation, the power generation amount is large, the reliability is high, and effective frequency band is wide; and the suspension self-excitation runner piezoelectric beam energy harvester can be used as a standardized part to be applied to cantilevered shaft gears and the multi-gear coaxial occasions.

The invention discloses an energy acquisition device based on dual sinking-floating freedom degree flow-induced vibration. The device comprises a rigid wing panel, two rotating shafts and two groups of piezoelectric beams; two rotating shafts penetrate the rigid wing panels along the wingspan directions and are smoothly connected with the same; extending ends of the two rotating shafts are respectively and fixedly connected with the base through two groups of piezoelectric beams; when the freestream velocity is more than the critical flutter speed of the structure, the rigid wing panel is self-excited to produce the flow-induced vibration at the sinking-floating and pitching direction, the specific performance is the respective sinking-floating movement at two rotating shafts; two groups of piezoelectric beams are used for respectively acquiring the vibration mechanical energy at the dual sinking-floating freedom degree through bending deformation. Compared with the prior art, the mechanical energy of the wing panel at the pitching direction movement is acquired in addition while acquiring the energy, and then the total electric energy output of the energy acquisition device is improved.

The invention relates to a runner-type piezoelectric beam energy harvester with a suspended shaft end, and belongs to the field of piezoelectric power generation. A left end cover and a right end cover are arranged at the left side and the right side of a runner respectively; metal substrates provided with cantilever beams are crimped between the left end cover and the side wall of the runner and the right end cover and the side wall of the runner respectively; each metal cantilever beam and an adhered piezoelectric crystal plate form a piezoelectric vibrator; an excited magnet is arranged at a free end of each piezoelectric vibrator, is arranged close to the runner and is arranged in a rectangular guide groove in the side surface of the runner; a cantilever shaft of a gear is arranged in a center hole of the runner and the end part is connected with the right end cover; the cantilever shaft and a ring cavity in the runner form a slideway; a cylindrical exciter made of a non-ferromagnetic material is arranged in the slideway; and exciting magnets are inlaid into two ends of the exciter. The runner-type piezoelectric beam energy harvester with the suspended shaft end has the features and advantages that a fixed support is not needed, the structure is simple and the rotating force on the exciter is small; the piezoelectric vibrators are reasonable in structure and the stresses of various points are the same after deformation; the piezoelectric vibrators are high in generating capacity, high in reliability and wide in effective band; and the runner-type piezoelectric beam energy harvester can be applied to the occasion of coaxial cantilever shaft gear and multi-gear as a standard component.

The invention discloses a multi-directional vibration responded energy collector, comprising a bracket, wherein a cover plate is arranged on the bracket, a bottom plate is arranged under the bracket, at least three folding piezoelectric beams are arranged in the bracket, two ends of each folding piezoelectric beam are a fixed end and a cantilever end, the fixed ends of the folding piezoelectric beams are fixed on the bracket, the cantilever ends of the folding piezoelectric beams stretch into the middle part of the bracket, and a ball is arranged in a space encircled by the cantilever ends of the folding piezoelectric beams; the ball is a magnetized ball, a magnet structure is arranged on the bottom plate, a repulsive force acts between the ball and the magnet structure, the ball is in a suspension state under the action of the repulsive force of the magnet structure, and a vertical folding piezoelectric beam fixed on the cover plate is arranged right above the ball. According to device, by moving the ball under the action of external vibration excitation, acting forces are applied to the surrounding folding piezoelectric beams, so that the folding piezoelectric beams deform and generate stresses; and piezoelectric charges are generated on two sides of each folding piezoelectric beam by the piezoelectric effect, and collected by electrodes, so that the vibration energy is collected, and the collection efficiency is higher.