100results about How to "Improve electromechanical conversion efficiency" patented technology

A micropower passive electronic lock cylinder including an immovable cylinder body (3), a rotatable plug (1), and an electronic control circuit part is described. An electronic control circuit board (13) electrically connected with a micromotor (14) and locating switches (15, 16) is arranged in the rotatable plug (1). A lock pin (8), which is controlled by a displacement limiting cam (5) driven by the micromotor (14), moves between the immovable cylinder body (3) and the rotatable plug (1) to release or block the rotatable plug (1).

The invention provides a piezoelectric excitation pulled silicon micro-resonant pressure sensor chip and a preparation method thereof. The pressure sensor chip mainly comprises a sealed glass cover, aresonator layer, a pressure sensitive film layer, a stress isolation pad, a piezoelectric excitation element and a resistance vibration pick-up element. A composite structure of a pressure sensitivediaphragm and a resonator is adopted. For a second sensitive mode, the resonator layer comprises a resonant beam and a torsion beam. An extension part at one end of two adjacent resonant beams is connected to the same suspended torsion beam, and the other end is connected to a mass block. A coupling beam is arranged in the middle of the mass block. The resonator is connected to an anchor point through a connection point. A pressure guide hole is formed in the stress isolation pad, and the pressure is delivered to the rectangular pressure sensitive diaphragm under the guidance of the pressure guide hole to cause deformation. The deformation is amplified by the anchor point, and delivered to the resonator layer. Piezoelectric actuators and resistive vibration pick-up elements are respectively arranged on the outer surface of the resonant beam and the coupling beam. The piezoelectric actuators and the resistive vibration pick-up elements are connected with an external circuit through leads respectively.

The invention discloses an optoacoustic/ultrasonic dual mode endoscope based on piezoelectric micromachined ultrasonic transducer arrays. The optoacoustic/ultrasonic dual mode endoscope includes a piezoelectric micromachined ultrasonic transducer (PMUT) array probe (2), a PMUT array element (1), an integrated circuit (3), a plane lens (4), a condenser lens (6), an optical fiber coupling collimator (7), a single-mode fiber (8), an optical fiber FC/APC connector (9), an optical fiber (10), a signal line (11) and an housing (12). The optoacoustic/ultrasonic dual mode endoscope is characterized in that, the piezoelectric micromachined ultrasonic transducers are adopted, the transducers and the integrated circuit are good in compatibility during manufacturing process, and the transducers are easy to form an array; transducer arrays are adopted, the endoscope does not need to rotate, the imaging speed is raised, real time imaging is achieved; and the multiple transducer arrays can effectively raise the signal to noise ratio of a signal, deep imaging through focusing and scanning is achieved. The optoacousitc/ultrasonic dual mode endoscope can be widely applied to fields of medical endoscopes and industrial flaw detection, and particularly has great application value in in-vivo scar tissue identification, assessment of damage of ablation of tissue, atherosclerotic degree assessment and the like.

The invention discloses a chiral negative Poisson's ratio structure based on dielectric electroactive polymers. The structure is formed by a chiral negative Poisson's ratio cell array, and the cells consist of bones and a plurality of tendons. The tendons are made of dielectric electroactive polymers, and are of a sandwich structure, sandwich materials are dielectric elastomers, two sides are flexible electrodes, and the Young's modulus of the bones is larger than that of tendon materials. The flexible electrodes of two sides of the tendons are connected with the positive electrode and the negative electrode of high voltage direct current power supplies, and the voltage and path open-circuit state are adjustable. The chiral negative Poisson's ratio cells are arrayed, and thus the chiral negative Poisson's ratio structure can be formed. Since the mechanical states and electrostatic states of the dielectric electroactive polymers are mutually coupled, mutual conversion between mechanical energy and electric energy can be realized, and functions of structure real-time variability, actuation, energy recovery and sensing of the chiral negative Poisson's ratio structure are realized.

The invention relates to an improved polymer phase-based 1-3 type piezoelectric composite material and a preparation method therefor. According to the piezoelectric composite material, a sandwich type structure which is formed by epoxy resin, silicone rubber and other polymer is adopted to improve the polymer phase material to reduce influence to piezoelectric column vibration and to further improve the overall electromechanical coupling coefficient of the composite material. By adoption of a finite element analysis tool, the changing relation of resonant frequency, sound velocity, electromechanical coupling coefficient and characteristic impedance of the novel piezoelectric composite material along with volume percentages of silicone rubber is simulated; the piezoelectric composite material is prepared according to the simulation result and the performance of the material is tested; the test result proves that the experiment is basically matched with simulation; the electromechanical coupling coefficient of the composite material is improved by 11% compared with that of the conventional 1-3 type composite material; and the improved polymer phase-based 1-3 type piezoelectric composite material provided by the invention is quite suitable for manufacturing a piezoelectric composite material transducer with high electromechanical conversion efficiency.

The invention discloses a method and an apparatus used for cleaning air with water, According to the method and apparatus, electrostatic adsorption on smoke and dust which float in the air, and dissolution of hazardous substances in the air such as methanal, methylbenzene and carbonic oxide are realized by water mist particles with anions; and then waste water and refreshed clean air are separated by condensation at low temperature. The apparatus comprises an apparatus housing 1; a waste water case 2, an atomized water case 3, a ceramic atomizing plate 3-1, a coarse steel wire mesh 4, an aluminium condenser 5, a semiconductor chilling plate 6, an aluminum heat sink 7, an axial fan 8 and a power module 9 are arranged in the apparatus housing.

The invention relates to a piezoelectric ceramic material applicable to energy collecting devices and a preparation method thereof, belonging to the field of piezoelectric ceramic materials. The chemical composition of the matrix of the ceramic material is PbxSr1-x(Zn1/3Nb2/3ZryTi0.8-y)O3, and z wt% of CoCO3 is doped in the matrix material, wherein x is 0.90-1.00, y is 0.30-0.50, and z is 0.00-1.00. The preparation method comprises the following steps: by using ZnO, Nb2O5, Pb3O4, SrCO3, ZrO2, TiO2 and CoCO3 as raw materials, carrying out wet milling, drying, calcining, carrying out secondary ball milling, granulating, carrying out pressure molding, and sintering. The invention is applicable to energy collecting devices, can effectively recycle and reutilize waste energy, has the advantages of energy saving, environmental protection and high safety, and has obvious economic and social value.

The invention relates to a piezoelectric micro machining energy transducer, which comprises a pore cavity and a vibrating membrane on the surface of the pore cavity, wherein the vibrating membrane consists of a piezoelectric layer (2), an upper electrode (3) on the upper surface of the piezoelectric layer (2) and a lower electrode (4) on the lower surface of the piezoelectric layer (2); and furthermore, the vibrating membrane protrudes outwards relative to the pore cavity. A single piezoelectric layer dome structure is adopted in the piezoelectric micro machining energy transducer, so that the electromechanical conversion efficiency and the product performance are greatly improved; meanwhile, the production process is simpler and more reliable.

The invention relates to a windbell-type piezoelectric power generation device and belongs to the field of piezoelectric power generation. The windbell-type piezoelectric power generation device is formed by hanging a plurality of rod assemblies in an array-type mode; each rod assembly includes at least two rigid rods (1) from top to bottom, the rigid rods (1) are connected through flexible joints (2), and the side wall of each flexible joint (2) is at least provided with one piezoelectric unit (3) in an attached mode. The rigid rods (1) are connected through the flexible joints (2) provided with the piezoelectric units (3) in the attached mode to form the rod assemblies. Each rod assembly in a hanging state has a plurality of bending resonant frequencies, and the rod assemblies will perform bending resonance when a driving frequency is close to a certain resonant frequency; when incoming flow passes by the rod assemblies on a windward side, the rod assemblies bend, Karman vortex streets are generated behind the rod assemblies, and the adjacent Karman vortex streets in the array have phase differences which jointly act on the rod assemblies and excite the rod assemblies to generate resonance. According to the windbell-type piezoelectric power generation device, the utilization rate of incoming flow kinetic energy is improved by utilizing the array-type structure, and the electromechanical conversion efficiency of the system is improved by utilizing the resonance; the windbell-type piezoelectric power generation device has the advantages of being insensitive in incoming flow direction and wide in flow rate range.

The invention relates to the technical field of endoscopic imaging, and in particular relates to a photoacoustic endoscopic type A scanning imaging system. The system comprises an exciting and sensing unit A and a controlling and processing unit B which are connected with each other through a cable, wherein the exciting and sensing unit A comprises an endoscopic lens and a cable which are connected with each other; the cable is connected to the controlling and processing unit B. The system disclosed by the invention has the advantages that the cMUT technique is adopted, the processing size and the system size of a cMUT ring array sensor are respectively at micrometer magnitude and millimeter magnitude, high-density array is easy to form, the bandwidth is large, the electromechanical conversion efficiency is high, and the micromation and the practicability of the system structure are realized; cMUT array elements are arranged in a ring array structure, the photoacoustic type A detecting imaging of multiple sites in the front area of a central axis can be realized, each element can receive photoacoustic signals by selecting different numbers of vibration membranes so as to improve the system detectivity.

The invention relates to a vehicle vibration power generation device with a USB interface. The device adopts a heavy hammer and a double-acting type ratchet wheel as a vibration pickup mechanism, a gear set is a vibration mechanical energy transmission mechanism, a direct current permanent magnet generator is an electromechanical energy conversion mechanism, and an electric energy processing circuit with a USB interface processes irregular direct current electric energy, and supplies power to a vehicle-mounted electronic device. The vehicle vibration power generation device uses the double-acting type ratchet wheel mechanism for vibration pickup, converts rectilinear motion in vehicle running to rotational motion, and drives the low damping permanent magnet direct current generator to work through the efficient gear mechanism, and compared with a common linear type vibration power generation device, the transmission and conversion efficiency of vibration mechanical energy can be significantly improved. The vehicle vibration power generation device with the USB interface generates power by renewable energy, the vibration pickup efficiency, and the energy transmission and conversion efficiency are high, the working life is long, the USB interface is adopted to be suitable for the use of most vehicle-mounted electronic devices, and the universality is strong.

The invention belongs to the field of vibration energy power generation, and provides an electromagnetic vibration power supply method based on a folding cantilever beam. The method comprises the following steps: converting vibration with a specific frequency of mechanical equipment into electric energy by an energy collector mounted on the mechanical equipment, and supplying power to a micro-miniature electronic system, wherein the energy collector comprises a base, a mass block and a pair of folding cantilever beams, two ends of the mass block are respectively connected to the base through a folding cantilever beam, two ends of a folding cantilever beam circuitous structure are fixedly connected with the base, the middle part of the folding cantilever beam circuitous structure is fixedly connected with the end part of the mass block, a plurality of coils are fixedly connected to the base through a supporting seat, and the hollow parts which surround the coils and are fixedly provided with permanent magnets are sequentially arranged at intervals on the mass block. When a spring mass block oscillation system vibrates, the coil cuts magnetic lines of force in a reciprocating manner to generate current. The energy collector which is compact in structure and high in electromechanical conversion efficiency is adopted as a power source of the wireless sensor node, so the implementation and maintenance cost is low.

The invention relates to a double-control rectifying vehicle alternating-current generator which mainly comprises a belt pulley, a front end cover, a front bearing, a stator, an excitation rotor, a rear end cover, a rear bearing, a double three-phase half-controlled type rectifier, a regulator, a conversion control circuit and a rear cover. The double-control rectifying vehicle alternating-current generator is characterized in that external characteristic curves of a high-turn winding L1 and a low-turn winding L2 intersect at a K point, and the rotating speed corresponding to the K point is nK; when the working rotating speed of the generator is below nK, the conversion control circuit turns off controlled silicons SCR4-SCR6 and sequentially triggers and conducts a controlled silicon with highest forward voltage after passing through a natural reversal point in controlled silicons SCR1-SCR3; and when the working rotating speed of the generator is above nK, the conversion control circuit turns off the controlled silicons SCR1-SCR3 and sequentially triggers and conducts a controlled silicon with the highest forward voltage after passing through the natural reversal point in the controlled silicons SCR4-SCR6. Thus the double-control rectifying vehicle alternating-current generator realizes the switching between the works of the winding L1 and the winding L2 along with the rotating speed of the generator, has the advantage of high average efficiency and is suitable for vehicles, tractors, tanks, and the like.

The invention relates to a piezoelectric thread driving type one-dimensional positioning platform, and belongs to the technical field of precision driving and positioning. The platform comprises a positioning workbench, a lifting mechanism, a driving mechanism and a base; the driving mechanism includes a piezoelectric thread driver composed of a stator and a rotor; the stator consists of four piezoelectric transducers with the same structure and a flange nut, and the rotor is a screw rod; the four piezoelectric transducers are located in the base and connected with the outer circumference of the nut base through flexible hinges respectively. The flange nut is fixed to one axial end of the nut seat and connected with the screw in a matched mode. The upper end of the screw rod is in contactwith the bottom surface of the positioning workbench, when two groups of sine alternating-current voltages with the same frequency, the same amplitude and the phase difference of pi/2 are adopted andthe driving signals are used as two groups of driving signals for forming four piezoelectric transducers which are orthogonally arranged, the screw rod is driven to obtain the rotating speed, generateclockwise or anticlockwise rotating motion and convert the clockwise or anticlockwise rotating motion into axial linear motion, so that the positioning workbench is pushed to generate upward or downward lifting motion.

The invention relates to a silicone rubber composite material with high mechanical-electrical conversion efficiency and a preparation method thereof, and belongs to application of dielectric elastomer materials in the field of generators. The composite material comprises 100 parts of a rubber matrix, 1-5 parts of a vulcanizing agent, 5-30 parts of a modified inorganic nano filler, 10-50 parts of a modified inorganic micron filler and 0-50 parts of a plasticizer. According to the preparation method, the dielectric constant of the composite material is improved, meanwhile, the lower elastic modulus is kept, and the silicone rubber nano composite material with the high dielectric constant, the low elastic modulus, the high energy density and the high mechanical-electrical conversion efficiency is obtained. The novel silicone rubber composite material provides a preparation method and thought of a novel material for the field of dielectric elastomer generators.