40results about How to "Effective frequency bandwidth" patented technology

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 relates to a telescopic pipeline flow generator, which belongs to the technical field of new energy and pipeline monitoring. The inner wall of the pipeline is equipped with a shell through the radial plate, and the end of the side wall of the shell is equipped with an end cover; the left and right sides of the vertical plate of the support are provided with left and right pins, and the right sides of the upper and lower ends are provided with horizontal plates with inclined mounting surfaces; The left pin protrudes through the bottom wall of the shell, and a blunt body is installed at the end of the left pin; a support spring and a buffer spring are respectively set between the bottom wall of the upper shell of the left pin, the blunt body and the vertical plate of the bracket; From left to right, there are left spring, exciter, frequency modulation block and right spring in turn. The exciter is connected to the frequency modulation block. The right end of the right spring is against the stopper at the end of the right pin; A moving cam composed of a bottom surface, a slope and a top surface is provided in the axial direction; one end of the piezoelectric vibrator is installed on the mounting surface of the bracket, and the flange of the piezoelectric vibrator substrate is in contact with the midpoint of the cam slope when it is not working, and the assembly is pre-bent and deformed The amount is half of its allowable value, and the allowable deformation of the piezoelectric vibrator is greater than the cam lift.

The invention relates to a rotationally excited friction-piezoelectric composite generator, which belongs to the technical field of new energy sources. The end cover is installed at the end of the cylinder, and the rotating shaft is installed on the end cover and the bottom of the shell; the swing ring of the exciter is set on the fixed ring, and there is an axial inclination between the fixed ring and the axis of the swing ring, and a dial ring is arranged on the outer edge of the swing ring. Both sides of the ring are equipped with paddles, the fixed ring is installed on the rotating shaft and rotates with the rotating shaft; the two brackets and the spacer ring are installed on the inner side of the shell, the bracket is composed of a ring plate and a guard plate, and the convex surface of the guard plate is provided with Composite film composed of friction layer and electrode layer; a piezoelectric vibrator is crimped between the ring plate of the bracket and the spacer ring, the substrate of the piezoelectric vibrator is installed close to the friction layer, and the piezoelectric vibrator and the composite film constitute a friction pair; The paddle on the side is located between two axially adjacent piezoelectric vibrators; when the shaft rotates, the paddle forces the piezoelectric vibrator to reciprocally bend and deform, and repeatedly contacts and separates from the composite film, the substrate of the piezoelectric vibrator and the piezoelectric vibrator The piezoelectric power generation end is formed between the sheets, and the friction power generation end is formed between the substrate and the composite film.

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 present invention relates to a water flow-induced vibration energy accumulator and belongs to the technical field of electric power generation. An end part of a side wall of a shell body is provided with an end cap, a wire coil is embedded inside a bottom wall, upper and lower ear plates are arranged on an outer side of the bottom wall, and a long pin is fixed on the upper and lower ear plates; a flow disturbing body consists of a column body, a boss and a side plate; the side plate sleeves the long pin, and two pressure springs sleeving the long pin are pressed on upper and lower sides of the side plate; a magnetic strip is mounted on the boss, the magnetic strip is installed near a bottom wall of the shell body; a frame is provided with a frame bottom plate as well as inner and outer ears plates, the bottom plate of the frame is mounted on the end cap, a rocker arm of an exciter is provided with a rocker ear plate and a cam, a magnetic block is mounted on the rocker arm, the rocker arm sleeves a rotary shaft, two ends of the rotary shaft are fixed on the outer ear plate, pin shafts are mounted on the inner ear plate and the ear plate of the rocker arm, two ends of a tension spring are connected onto the pin shaft, energy transducers are mounted on an upper side and a lower side the frame bottom plate, each energy transducer is formed by bonding a substrate and a piezoelectric membrane, end parts of the energy transducers are butted against a vertex of the cam, a cam contour curve comprises two arc contours that are concentric with an axle hole, and the energy transducers are of a flat and straight structure before installation.