CN106059390A - Self-excitation vibration type steady pipe flow piezoelectric generator - Google Patents

Abstract

The invention relates to a self-excitation vibration type steady pipe flow piezoelectric generator, belonging to the field of pipeline monitoring. A shell is mounted in the a pipeline, the bottom of the shell is provided with a pedestal and an end part of the shell is provided with an end cover; a plummer block divides a pin shaft into a left half shaft and a right half shaft, a limiting spring on the right half shaft is pressed on the pedestal by the plummer block, and the end part of the right half shaft is located in a guide hole of the pedestal; the left half shaft is orderly provided with a sliding sleeve, a clamp spring and a buffer spring, the end part of the left half shaft stretches out via the guide hole of the end cover and is provided with an excitation plate; a right end of a piezoelectric vibrator is fixed on the pedestal, and a left end and a middle part of the piezoelectric vibrator are fixed on the sliding sleeve; before assembling, the piezoelectric vibrator is a flat and straight structure, and after assembling, the piezoelectric vibrator is a bent structure, a radius of curvature of a piezoelectric wafer is less than a radius of a base plate, and the piezoelectric wafer bears a pressure stress. The self-excitation vibration type steady pipe flow piezoelectric generator has characters and advantages that the flat and straight piezoelectric vibrator is changed into a bent structure by means of assembling, thus, a power generation apparatus performing stretching vibration along a pipeline length direction is formed, structure and technology are simple, and cost is low; the piezoelectric wafer always bears the pressure stress, and the stability is high; and electricity production can be increased easily through increase of the number and the length of piezoelectric vibrators.

Description

A kind of self-excited vibration formula permanent pipe flow piezoelectric generator

Technical field

The invention belongs to oil and gas pipes monitoring system and field of piezoelectric generation, be specifically related to a kind of permanent pipe of self-excited vibration formula Stream piezoelectric generator.

Background technology

Oil and gas pipes is the lifeblood of national energy and economic construction.Because of spontaneous corrosion, nature act of god, especially people The gas oil pipe leakage event caused for pilferage etc. happens occasionally, and not only causes huge economic loss, the most also to its week Limit natural environment causes serious pollution.In the past, oil-gas pipeline is safeguarded by the method frequently with regular manual inspection, but Because it lays distance and is often in uninhabited or part of having inconvenient traffic, regular visit is difficult to find that leakage is the most in time Maintenance, therefore there has been proposed polytype line leakage or burglary-resisting system.Though some pipe leakage proposed or anti- Steal alarming method by monitoring the most ripe at technological layer, but the application of China's monitoring leak from oil gas pipe or burglary-resisting system at present is also Being in the starting stage, be not yet used widely, its main cause is that its powerup issue is not well solved: uses and lays The method cost of cable is high and is easily cut off by lawless person and affects the properly functioning of monitoring system；And when using battery to power Using limited time, need to often change, and the most in time replacing not enough once battery electric quantity also cannot complete the remote of monitoring information Journey is transmitted.Therefore, for making gas oil pipe leakage or burglary-resisting system be used practically, it is necessary to first solve its powerup issue.

In recent years, for meeting the self-powered demand of all kinds of sensing and monitoring system, domestic and international experts and scholars propose multiple newly The miniature piezoelectric TRT of type, they have simple in construction, do not generate heat, without electromagnetic interference, integrated high, the suitableeest System power supply is monitored in wireless sensing.But, existing for the self-powered piezoelectric generating device of oil and gas pipes sensing and monitoring system In, it being mostly and rotate the generating of driving pressure electric tachometer indicator oscillator by fluid turbine, they structures are complicated, volume is big, uncomfortable In the pipeline that diameter is relatively small；Meanwhile, piezoelectric vibrator compound bending at work deforms, bears and alternately draw-compressive stress, when drawing When stress is excessive, piezoelectric chip is fragile, reliability is relatively low.

Summary of the invention

The limitation applied for a power supply difficult problem and the existing piezoelectric generating device of oil/gas pipe line monitoring, the present invention A kind of self-excited vibration formula permanent pipe flow piezoelectric generator is proposed.The present invention adopted implementation scheme is that inner-walls of duct is through left and right spoke Plate is equipped with housing, equipped with bearing, end equipped with end cap in shell bottom wall；Bearing pin is divided into left and right semiaxis by pillow block, is enclosed within right axle shaft On limit spring be pressed on bearing by pillow block, right axle shaft end is placed in the pilot hole of bearing；Depend on from right-to-left on left half axle Secondary being cased with sliding sleeve, be fixed with jump ring, be cased with buffer spring, left half axle end is stretched out through the pilot hole of end cap and is provided with sharp plate； Piezoelectric vibrator is by metal basal board and uniform piezoelectric chip is bonding forms, metal basal board right-hand member is fixed on bearing, left end and in Portion is fixed on different sliding sleeves；Be flat construction before piezoelectric vibrator assembling, assemble after be warp architecture, and piezoelectric chip curvature Radius bears compressive stress less than metal basal board radius of curvature, piezoelectric chip；It is placed between two adjacent sliding sleeves, is placed in bearing and therewith Each piezoelectric vibrator between adjacent sliding sleeve respectively constitutes generator unit.

Under off working state after installation and without fluid flowing, buffer spring is pressed against by piezoelectric vibrator through the sliding sleeve of high order end On end cap, jump ring is pressed against on end cap by limit spring through bearing pin；For improving generating capacity and reliability, normal operating conditions Under, i.e. when sharp plate hydrodynamic pressure, limit spring, buffer spring and piezoelectric vibrator jointly act on reach dynamic equilibrium state time, Piezoelectric vibrator by half that decrement is its allowable value, the half that is its maximum compressible amount；Accidentalia makes fluid move When pressure increases and makes piezoelectric vibrator be reached allowable value by decrement, limit spring is crushed to death, and fluid force is directly held by bearing It is subject to.

Under duty, hydrodynamic pressure makes to swash plate and bearing pin moves to right, force each generator unit and limit spring to be compressed, Buffer spring elongation, jump ring depart from end cap, and piezoelectric chip institute compression chord increases；When sharp plate hydrodynamic pressure, limit spring, Buffer spring and piezoelectric vibrator act on when reaching dynamic equilibrium state jointly, sharp plate produced vortex-induced vibration under action of a fluid By bearing pin force each generator unit produce stretching vibration: bearing pin to left movement time, each generator unit and limit spring elongation, Buffer spring shortens, piezoelectric chip institute compression chord increases；Otherwise, when bearing pin moves right, each generator unit and limit spring Shorten, buffer spring extends, piezoelectric chip institute compression chord reduces；During the elongation-shortening alternately of above-mentioned each generator unit, Piezoelectric chip bears compressive stress all the time, and reliability is high；It is easy to the method by increasing piezoelectric vibrator quantity and length and improves generating Amount.

Advantage and characteristic: 1. straight piezoelectric vibrator is become warp architecture by the method by installing, and is formed along duct length The TRT of direction stretching vibration, structure and processing technology are simple, low cost；2. piezoelectric chip is only operated in compressive stress state Under and compressive stress range-controllable, reliability is high；3. it is easy to the method by increasing piezoelectric vibrator quantity and length and improves generating Amount.

Accompanying drawing explanation

Fig. 1 is the section of structure in a preferred embodiment of the present invention under generator operation state；

The A-A view of Fig. 2 Fig. 1；

Fig. 3 is the structural representation installing front piezoelectric vibrator in a preferred embodiment of the present invention；

Fig. 4 is the section of structure in a preferred embodiment of the present invention under electromotor off working state.

Detailed description of the invention

Pipeline a inwall is provided with on the diapire c1 of housing c, housing c to be provided with through screw through left disc b and right disc b ' and props up Seat i, the end of housing c through screw equipped with end cap k；Bearing pin f is divided into left half axle f2 and right axle shaft f3 by pillow block f1, is enclosed within right axle shaft Limit spring h on f3 is pressed on bearing i by pillow block f1, and right axle shaft f3 end is placed in the pilot hole of bearing i；On left half axle f2 It is cased with sliding sleeve g from right-to-left successively, is fixed with jump ring p, is cased with buffer spring j, the end of left half axle f2 guiding on end cap k Hole is stretched out and is provided with sharp plate m；Piezoelectric vibrator d is by metal basal board d1 and uniform piezoelectric chip d2 is bonding forms, metal basal board The right-hand member of d1 is fixed on bearing i through screw and briquetting e, left end and middle part are fixed on different sliding sleeve g through screw and briquetting e On；It is flat construction under naturalness before piezoelectric vibrator d assembling；Piezoelectric vibrator d becomes warp architecture and piezo crystals after installing The radius of curvature of the sheet d2 radius of curvature less than metal basal board d1, piezoelectric chip d2 bears compressive stress；Be placed in two adjacent sliding sleeve g it Between, each piezoelectric vibrator d of being placed between bearing i and sliding sleeve g adjacent thereto respectively constitute generator unit Q.

Under off working state after installation and without fluid flowing, piezoelectric vibrator d through the sliding sleeve g of high order end by buffer spring j Being pressed against on end cap k, jump ring p is pressed against on end cap k by limit spring h through bearing pin f；For improving generating capacity and reliability, just Under normal duty, i.e. reach when sharp plate m acts on jointly at hydrodynamic pressure, limit spring h, buffer spring j and piezoelectric vibrator d During to dynamic equilibrium state, piezoelectric vibrator d by half that decrement is its allowable value, the half that is its maximum compressible amount； Accidentalia makes hydrodynamic pressure increase and make when being reached allowable value by decrement of piezoelectric vibrator d, and limit spring h is crushed to death, Fluid force is directly born by bearing i.

Under duty, hydrodynamic pressure makes to swash plate m and bearing pin f and moves to right, and forces each generator unit Q and limit spring h Compression, buffer spring j elongation, jump ring p depart from the compression chord increase of end cap k, piezoelectric chip d2 institute；When sharp plate m is at hydrodynamic Power, limit spring h, buffer spring j and piezoelectric vibrator d act on when reaching dynamic equilibrium state jointly, swash plate m under action of a fluid Produced vortex-induced vibration forces each generator unit Q to produce stretching vibration also by bearing pin f: bearing pin f when left movement, each Electric unit Q and the elongation of limit spring h, buffer spring j shortening, the compression chord increase of piezoelectric chip d2 institute；Otherwise, bearing pin f is to the right During motion, each generator unit Q and limit spring h shorten, buffer spring j extends, piezoelectric chip d2 institute compression chord reduces；Above-mentioned During each generator unit Q elongation-shortening alternately, piezoelectric chip d2 bears compressive stress all the time, and reliability is high；It is easy to by increasing The method adding piezoelectric vibrator d quantity and length improves generated energy.

Claims (1)

1. a self-excited vibration formula permanent pipe flow piezoelectric generator, it is characterised in that: inner-walls of duct through left and right disc equipped with housing, Equipped with bearing, end equipped with end cap in shell bottom wall；Bearing pin is divided into left and right semiaxis, the limit spring being enclosed within right axle shaft by pillow block Being pressed on bearing by pillow block, right axle shaft end is placed in the pilot hole of bearing；It is cased with sliding sleeve on left half axle from right-to-left successively, consolidates Surely having jump ring, be cased with buffer spring, left half axle end is stretched out and equipped with sharp plate through the pilot hole of end cap；Piezoelectric vibrator is by metal Substrate and uniform piezoelectric chip is bonding forms, metal basal board right-hand member is fixed on bearing, left end and middle part are fixed on different On sliding sleeve；Piezoelectric vibrator assembling before be flat construction, assembling after be warp architecture, and piezoelectric chip radius of curvature be less than Metal Substrate Plate radius of curvature, piezoelectric chip bear compressive stress；Under off working state, buffer spring is pressed against by piezoelectric vibrator through high order end sliding sleeve On end cap, jump ring is pressed against on end cap by limit spring through bearing pin；Under normal operating conditions, piezoelectric vibrator by decrement be The half of its allowable value；When accidentalia makes hydrodynamic pressure increase and make piezoelectric vibrator be reached allowable value by decrement, spacing bullet Spring is crushed to death, and fluid force is directly born by bearing.