CN205847128U - A kind of radially tension and compression excitation rotary piezoelectric generator - Google Patents

Abstract

This utility model relates to a kind of radially tension and compression excitation rotary piezoelectric generator, belongs to field of piezoelectric generation.Rotor shaft is placed on main body diapire, rotating disk is placed in main cavity；End cap is arranged on main body wall end, and equipped with being embedded with the stator of fixed magnet on end cap, stator is placed in dish intracavity；Piezoelectric vibrator substrate two ends are fixed on dish groove sidewall, centre is fixed on the force application rod shaft shoulder, and force application rod inner shaft end is cased with spring equipped with on moving magnet, outer semiaxis, and spring is pressed on dish groove sidewall by the shaft shoulder；Piezoelectric vibrator assembling before be flat construction, installation after be warp architecture；Inside and outside the force application rod shaft shoulder, piezoelectric vibrator constitutes inside and outside generator unit, and during a generator unit elongation maximum, another generator unit shortening amount reaches maximum；Advantage characteristic: straight piezoelectric vibrator is mounted to warp architecture, forms that radial telescopic type electromotor, structure and technique is simple, low cost；Piezoelectric chip is by the compressive stress of range-controllable, and reliability is high；Be suitable to the occasion that axial space is little and radial dimension is big.

Description

A kind of radially tension and compression excitation rotary piezoelectric generator

Technical field

The invention belongs to new forms of energy and technical field of power generation, be specifically related to a kind of radially tension and compression excitation rotary piezoelectric generating Machine, the health monitoring systems for rotary body is powered.

Background technology

For meet the rotary bodies such as helicopter screw propeller, automobile tire, aero-engine, bullet train, oil gas brill, gear or The power demands of its bearing assembly health monitoring systems, Chinese scholars has been proposed for the rotary piezoelectric generating of various ways Machine, its common feature is: (i), with the circle of monomer or cantilever beam piezoelectric vibrators as energy conversion device, deflection cannot be controlled System；(ii) in work piezoelectrics bear alternation draw-action of compressive stress；(iii) piezoelectric vibrator is forced to vibrate by axial excitation Generating.Because monomer piezoelectric vibrator deflection is uncontrollable and piezoelectric allowable tensile stress is well below its permissible compression stress, when When deflection and institute's compression chord are bigger, the piezoelectrics of fragility are broken, and system reliability is low；Additionally, gear-box, Railway wheelset Limited Deng the axial space of most products, it is impossible to or inconvenience installs excitation mechanism, maybe cannot meet piezoelectric vibrator axial vibration and send out The space requirement of electricity.Obviously, the generating of existing rotary piezoelectric there is also bigger problem in terms of the adaptability of reliability and environment, Inconvenience further genralrlization application.

Summary of the invention

For existing rotary piezoelectric generating in terms of the adaptability of reliability and environment existing for problem, the present invention carries Go out a kind of radially tension and compression excitation rotary piezoelectric generator.The present invention adopted implementation scheme is that the rotating shaft of rotor is pacified through bearing Being contained on main body diapire, the rotating disk of rotor is placed in main cavity, and rotating disk is provided with dish groove and dish chamber, dish groove and dish chamber through guide hole even Logical；End cap is arranged on the end of main body wall through screw, and end cap is fixed with stator through screw, and stator is inlaid with fixed magnet, The one end being inlaid with fixed magnet on stator is placed in dish intracavity；Piezoelectric vibrator is formed by metal basal board and piezoelectric chip are bonding, metal The two ends of substrate are fixed on the sidewall of dish groove through screw and briquetting, centre is fixed on the force application rod shaft shoulder through screw and briquetting, Force application rod is divided into inner shaft and outer semiaxis by the force application rod shaft shoulder, and inner shaft end is provided with moving magnet, and moving magnet is placed in rotor In guide hole；Being cased with balancing spring on outer semiaxis, balancing spring is crimped on the sidewall of dish groove by the shaft shoulder；Before piezoelectric vibrator assembling Under naturalness be flat construction and its length more than the radical length of dish groove on rotor, become warp architecture and pressure after installation The radius of curvature of electricity wafer is less than the radius of curvature of metal basal board；It is placed in each piezoelectric vibrator inside and outside the force application rod shaft shoulder respectively Generator unit and outer generator unit in constituting.

Under normal operating conditions, and when the spacing of moving magnet Yu fixed magnet is farthest, interaction force is minimum, force application rod It is in poised state under the centrifugal action that the elastic force of balancing spring, the magnetic force moved between fixed magnet and rotary motion cause, In inside and outside generator unit, the stress of piezoelectric vibrator is identical with state during inoperative after installation, piezoelectric chip institute compression chord Half for its allowable value；Along with rotor rotates, dynamic fixed magnet spacing shortens, active force increases, the poised state of force application rod Destroyed, in inside and outside generator unit, piezoelectric vibrator shape and piezoelectric chip stress all will change.When magnetic force increase makes When dynamic fixed magnet spacing reduces, interior generator unit shortens, its internal piezoelectric chip institute compression chord increases, and outer generator unit is stretched Long, its internal piezoelectric chip institute compression chord reduces；Otherwise, when magnetic force increase makes fixed magnet spacing increase, interior generating Unit elongation, its internal piezoelectric chip institute compression chord reduce, and outer generator unit shortens, its internal piezoelectric chip institute compression chord Increase；During above-mentioned inside and outside generator unit alternately elongation with shortening, the shortening amount of a generator unit is generated electricity by another Unit elongation quantitative limitation, i.e. when a generator unit elongation is maximum, piezoelectric vibrator is flattened, another generator unit Shortening amount reaches maximum, it can be ensured that piezoelectric chip bears rational compressive stress all the time, and reliability is high.

Advantage and characteristic: 1. straight piezoelectric vibrator is become warp architecture by the method by installing, and is formed along rotary body footpath Simple, the low cost to the TRT of stretching vibration, structure and processing technology；2. piezoelectric chip is only operated in compressive stress state Under and compressive stress range-controllable, reliability is high；3. by the method pressure excitation piezoelectric vibrator radially drawn, be suitable to axial dimension and be subject to Limit and the bigger occasion of radial dimension.

Accompanying drawing explanation

Fig. 1 is the section of structure of electromotor in a preferred embodiment of the present invention；

The left view of Fig. 2 Fig. 1；

The A portion enlarged drawing of Fig. 3 Fig. 1；

Fig. 4 is the structural representation in a preferred embodiment of the present invention before piezoelectric vibrator installation；

Fig. 5 is the structural representation of a preferred embodiment of the present invention rotor.

Detailed description of the invention

The rotating shaft k1 of rotor k is arranged on the diapire a2 of main body a through bearing j, and the rotating disk k2 of rotor k is placed in the interior of main body a In the a3 of chamber, rotating disk k2 is provided with dish groove k3 and dish chamber k4, and dish groove k3 connects through guide hole k5 with dish chamber k4；End cap b installs through screw The end of the sidewall a1 of main body a, end cap b are fixed with stator f through screw, stator f is inlaid with fixed magnet g, stator f inlays The one end being embedded with fixed magnet g is placed in the k4 of dish chamber；Piezoelectric vibrator e is by metal basal board e1 and piezoelectric chip e2 is bonding forms, metal The two ends of substrate e1 are fixed on the sidewall of dish groove k3 through screw and briquetting i, centre is fixed on force application rod c through screw and briquetting i Shaft shoulder c1 on, force application rod c is divided into inner shaft c2 and outer semiaxis c3 by the shaft shoulder c1 of force application rod c, and the end of inner shaft c2 is installed Having moving magnet h, moving magnet is placed in the guide hole k5 of rotor k；Being cased with balancing spring d on outer semiaxis c3, shaft shoulder c1 is by balancing spring d It is crimped on the sidewall of dish groove k3；Be that flat construction and its length L1 are more than rotor under naturalness before piezoelectric vibrator e assembling The radical length L2 of k upper dish groove k3, becomes the radius of curvature of warp architecture and piezoelectric chip e2 less than metal basal board e1 after installation Radius of curvature；It is placed in each piezoelectric vibrator e inside and outside the shaft shoulder c1 of force application rod c and respectively constitutes interior generator unit I and outgoing Electric unit II.

Under normal operating conditions, and when the spacing of moving magnet h Yu fixed magnet g is farthest, interaction force is minimum, force Under the centrifugal action that bar c magnetic force between elastic force, moving magnet h and the fixed magnet g of balancing spring d and rotary motion cause After being in the stress of piezoelectric vibrator e in poised state, interior generator unit I and outer generator unit II and installing during inoperative State is identical, and the compressive stress suffered by piezoelectric chip e2 is the half of its allowable value；Along with rotor k rotates, moving magnet h and fixed magnet Distance Shortened, active force between g increase, and the poised state of force application rod c is destroyed, in interior generator unit I and outer generator unit II The stress of piezoelectric vibrator e shape and piezoelectric chip e2 all will change.When magnetic force increase makes moving magnet h and fixed magnet g When spacing reduces, interior generator unit I shortens, its internal piezoelectric chip e2 institute compression chord increases, and outer generator unit extends, it Internal piezoelectric chip e2 institute compression chord reduces；Otherwise, when magnetic force increase makes moving magnet h and fixed magnet g spacing increases, interior Generator unit I elongation, its internal piezoelectric chip e2 institute compression chord reduce, and outer generator unit II shortens, its internal piezoelectric chip E2 institute compression chord increases；During above-mentioned inside and outside generator unit I and II alternately elongation with shortening, the contracting of a generator unit The loss of quantity is extended quantitative limitation by another generator unit, i.e. when a generator unit elongation is maximum, piezoelectric vibrator e is flattened Time, the shortening amount of another generator unit reaches maximum；Therefore can ensure that piezoelectric chip e2 bears rational compressive stress all the time, reliably Property high.

Claims (1)

1. a radial direction tension and compression excitation rotary piezoelectric generator, it is characterised in that: rotor shaft is at the bottom of bearing is arranged on main body Wall, rotor rotating disk is placed in main cavity, and rotating disk is provided with dish groove and dish chamber, and dish groove connects through guide hole with dish chamber；End cap is through screw It is arranged on main body wall end, end cap is fixed with stator, stator is inlaid with fixed magnet, stator is inlaid with the one of fixed magnet End is placed in dish intracavity；Piezoelectric vibrator is formed by metal basal board and piezoelectric chip are bonding, and metal basal board two ends are fixed on the side of dish groove On wall, centre be fixed on the force application rod shaft shoulder, force application rod is divided into inner shaft and outer semiaxis by the force application rod shaft shoulder, and inner shaft end is pacified Equipped with moving magnet, moving magnet is placed in the guide hole of rotor；Being cased with balancing spring on outer semiaxis, balancing spring is crimped on dish by the shaft shoulder On groove sidewall；It is that flat construction and its length are more than the radical length of dish groove on rotor before piezoelectric vibrator assembling, becomes after installation The radius of curvature of warp architecture and piezoelectric chip is less than the radius of curvature of metal basal board.