CN205681349U - A kind of eddy flow excitation generator for wind turbine gearbox monitoring system power supply - Google Patents

Abstract

The utility model relates to a kind of eddy flow excitation generator for wind turbine gearbox monitoring system power supply, belongs to field of piezoelectric generation.Being cased with housing, left axle sleeve, wheel rim, right axle sleeve and the right wallboard with import on main shaft from left to right successively, spindle nose is equipped with baffle plate, through bonded between wheel rim and main shaft；Housing barrel is provided with outlet, and housing barrel end is connected with right wallboard, equipped with balancing weight outside housing barrel；Housing barrel end is sequentially arranged with limitting casing, piezoelectric vibrator and briquetting, and limitting casing and piezoelectric vibrator are placed in the import of right wallboard；Piezoelectric chip is installed near limitting casing, piezo crystals length of a film and the wide length being respectively smaller than limitting casing cavity and width, metal substrate length and the wide length being respectively greater than limitting casing cavity and width.Advantage characteristic: the fluid motion-activated piezoelectric vibrator being caused by rotation, without rigid shock and electromagnetic interference；Piezoelectric chip is subjected only to the compression of range-controllable, and reliability is high；Supporting without fixing, cantilever gear shaft and the coaxial occasion of multi-gear all can be applied.

Description

A kind of eddy flow excitation generator for wind turbine gearbox monitoring system power supply

Technical field

The utility model belongs to gear monitoring and piezo-electric generating technical field, is specifically related to a kind of for wind turbine gearbox prison The eddy flow excitation generator that examining system is powered.

Background technology

Gear-box is the critical component of wind power generating set, and its function is transmission power.When wind-driven generator runs well, The rotating speed of wind wheel is relatively low, cause generator efficiency relatively low, therefore need to be by gear-box speedup to improve generating capacity and efficiency.Due to Wind turbine gearbox is operated under speed change varying load environment, therefore easily breaks down；Additionally, maintenance is tired when wind turbine gearbox breaks down Difficulty and cost are high, and wind turbine gearbox runs and maintenance cost may be up to the 30% of overall operation cost.Therefore, there has been proposed The gear-box real-time monitoring system for state of various ways and method, to obtaining each relevant parameter of gear-box in real time, sending out in time Now and solve problem, thus reduce device damage degree and maintenance cost.At present, the key element of wind turbine gearbox monitoring includes tooth All many-sides such as the load of the moving components such as wheel, bearing and wheel shaft, vibration and temperature.

For the monitoring of gear and axle, preferable method is to be arranged on all kinds of sensing and monitoring systems on gear or axle Or install near gear or axle, thus realize the direct-on-line monitoring of its running status；But this monitoring scheme is because being biography Reliable, the sufficient supply of electric power that provides of sense monitoring system is difficult to popularization and application, and reason is: 1. gear and axle are in rotation Motion state, it is impossible to pass through cable power supply；2. as used battery to power, need to often change because battery is limited, when Battery electric quantity is not enough and will be unable to realize effectively monitoring when not changing in time；3. cantilevered axle and the end tooth thereof away from bearing block When wheel and multiple gear are coaxial, all cannot be sent out by relative motion construction microminiature between swing pinion or axle and securing supports Motor.In view of the monitoring system energy supply problem of wind turbine gearbox gear and axle, at present reality also cannot realize really anticipating Real time on-line monitoring in justice.

Content of the invention

The power supply difficult problem being faced for existing wind turbine gearbox middle gear monitoring system, the utility model proposes a kind of use Eddy flow excitation generator in wind turbine gearbox monitoring system power supply.The utility model adopted implementation scheme is that gear is installed On main shaft, main shaft is cased with housing, left axle sleeve, the wheel rim of band blade, right axle sleeve and the right side being provided with import from left to right successively Wallboard, spindle nose is provided with baffle plate through screw；Housing wallboard and right wallboard respectively through bearing holder (housing, cover) on main shaft, on housing wallboard Bearing inner race on the left of act against on the main shaft shaft shoulder, act against on the right side of the bearing inner race on right wallboard on baffle plate, wheel rim and main shaft Between through bonded；Housing barrel is provided with outlet, and the end of housing barrel is connected with right wallboard through screw, the outside of housing barrel Through screw, balancing weight is installed；The end of housing barrel is sequentially installed with limitting casing, piezoelectric vibrator and briquetting, limitting casing through screw In the import being placed on right wallboard with piezoelectric vibrator；Piezoelectric vibrator is formed by metal substrate and piezoelectric chip bonding, piezoelectric vibrator Free end is provided with frequency modulation gauge block through screw；Piezoelectric chip is installed near limitting casing, and the length and width of piezoelectric chip is respectively Less than cavity length and the width of limitting casing, the length and width of metal substrate is respectively greater than length and the width of limitting casing cavity Degree；Housing, right wallboard and piezoelectric vibrator collectively form working chamber.

In the utility model, for improving dynamic response characteristic, generated energy and the reliability of piezoelectric vibrator, piezoelectric chip is The thick PZT4 of 0.2mm～0.3mm, metal substrate be beryllium-bronze and metal substrate with the thickness of piezoelectric chip than for α=1～ 2.5, generated energy now compared with big, i.e. energy comparison is big；Energy than refer to variant thickness than piezoelectric vibrator first order buckling become The ratio of electric energy produced by shape and maximum therein, first order buckling deformation refers to piezoelectric vibrator from free state to metal substrate Abut in the deformation process on the spacing curved surface of limitting casing completely；The confined planes of limitting casing is circular arc camber and its rational curvature Radius is:Wherein, α=h_m/h_pFor thickness ratio, h_mAnd h_pIt is respectively gold Belong to the thickness of substrate and piezoelectric chip.

During inoperative, main shaft does not rotates, piezoelectric vibrator is vertical with main-shaft axis, and the entrance on right wallboard is kept off by piezoelectric vibrator Live；Under duty, main shaft band moving vane rotates and causes fluid to move, and makes the internal import department residing for piezoelectric vibrator of working chamber Fluid pressure reduce, exit pressure increase, fluid through import flow into working chamber, through outlet flow out, piezoelectric vibrator is at fluid Flexural deformation to the left reach a certain relatively-stationary dynamic balancing corner under pressure effect, hereafter just start of reciprocating vibration, will stream Body kinetic energy is converted into electric energy；The dynamic balancing corner of piezoelectric vibrator increases with the increase of the speed of mainshaft, when the speed of mainshaft is too high, pressure When suffered by electric tachometer indicator, fluid force is bigger, the metal substrate of piezoelectric vibrator sweep will bear against on limitting casing, thus keeps away Exempt from piezoelectric chip to damage because suffered stress is excessive.

Advantage and characteristic: 1. utilize and rotate the fluid motion-activated piezoelectric vibrator generating causing, without rigid shock and electromagnetism Interference；2. piezoelectric chip is operated under compressive stress state and maximum stress is controlled；3. without fixing supporting, applied widely, outstanding Arm axle gear and the coaxial occasion of multi-gear all can be applied, and can realize the gear on-line monitoring of real meaning.

Brief description

Fig. 1 is the section of structure of energy accumulator in one preferred embodiment of the utility model；

Fig. 2 is the A-A sectional view of Fig. 1；

Fig. 3 is the structural representation of limitting casing in one preferred embodiment of the utility model；

Fig. 4 is the left view of Fig. 3；

Fig. 5 be piezoelectric vibrator energy than with thickness than relation curve.

Detailed description of the invention

Gear a is arranged on main shaft d, and main shaft d is cased with housing q, left axle sleeve c, the wheel rim with blade n from left to right successively M, right axle sleeve j and the right wallboard p being provided with import p1, the end of main shaft d is provided with baffle plate k through screw；The wallboard q1 of housing q and Right wallboard p is enclosed within main shaft d through bearing b respectively, acts against the axle of main shaft d on the left of the inner ring of the bearing b on the wallboard q1 of housing q On shoulder, act against on the right side of the inner ring of the bearing b on right wallboard p on baffle plate k, be connected through key 1 between wheel rim m with main shaft d；Housing q's Barrel q2 is provided with outlet q3, and the end of the barrel q2 of housing q is connected with right wallboard p through screw, the outside of the barrel q2 of housing q Through screw, balancing weight g is installed；The end of the barrel q2 of housing q is sequentially installed with limitting casing i, piezoelectric vibrator f and pressure through screw Block h, limitting casing i and piezoelectric vibrator f are placed in the import p1 on right wallboard p；Described piezoelectric vibrator f is by metal substrate f1 and piezoelectricity Wafer f2 bonding forms, and the piezoelectric vibrator f free degree is provided with frequency modulation gauge block e through screw；Piezoelectric chip f2 pacifies near limitting casing i Dress, the length and width of piezoelectric chip f2 is respectively smaller than the length and width of the cavity i1 of limitting casing i, the length of metal substrate f1 It is respectively greater than the length and width of the cavity i1 of limitting casing i with width；Housing q, right wallboard p and piezoelectric vibrator f collectively form work Make chamber.

In the utility model, for improving dynamic response characteristic, generated energy and reliability, the piezoelectric chip f2 of piezoelectric vibrator f For the PZT4 that 0.2mm～0.3mm is thick, metal substrate f1 is that the thickness ratio of beryllium-bronze and metal substrate f1 and piezoelectric chip f2 is for α =1～2.5, generated energy now compared with big, i.e. energy comparison is big；Energy than refer to variant thickness than piezoelectric vibrator f once The ratio of electric energy produced by flexural deformation and maximum therein, first order buckling deformation refer to piezoelectric vibrator f from free state to Metal substrate f1 abuts in the deformation process on the spacing curved surface i2 of limitting casing i completely；The confined planes i2 of limitting casing i is that circular arc is bent Face and its rational radius of curvature R be:Wherein α=h_m/h_pFor thickness Ratio, h_mAnd h_pIt is respectively the thickness of metal substrate f1 and piezoelectric chip f2.

During inoperative, main shaft d does not rotates, piezoelectric vibrator f is vertical with the axis of main shaft d, and the entrance p1 on right wallboard p is pressed Electric tachometer indicator f blocks；Under duty, main shaft d band moving vane n rotates and causes fluid to move, and makes the internal piezoelectric vibrator f of working chamber The fluid pressure at residing import p1 place reduces, the pressure at outlet q3 place increases, and fluid is through import p1 inflow working chamber, through exporting Q3 flows out, piezoelectric vibrator f flexural deformation to the left reach a certain relatively-stationary dynamic balancing corner under fluid pressure effect, Hereafter just start of reciprocating vibration, fluid dynamic energy is converted into electric energy；The dynamic balancing corner of piezoelectric vibrator f is with the increasing of main shaft d rotating speed Add and increase, when when main shaft d rotating speed is too high, suffered by piezoelectric vibrator f, fluid force is bigger, the sweep of piezoelectric vibrator f Metal substrate f1 will bear against on limitting casing i, thus avoids piezoelectric chip f2 to damage because suffered stress is excessive.

Claims (1)

1. the eddy flow excitation generator for wind turbine gearbox monitoring system power supply, it is characterised in that: on main shaft from a left side extremely The right side is cased with housing, left axle sleeve, the wheel rim of band blade, right axle sleeve and the right wallboard being provided with import successively, and spindle nose is provided with gear Plate；Housing wallboard and right wallboard respectively through bearing holder (housing, cover) on main shaft, act against spindle shaft on the left of the bearing inner race on housing wallboard On shoulder, act against on the right side of the bearing inner race on right wallboard on baffle plate, through bonded between wheel rim and main shaft；Housing barrel is provided with out Mouthful, housing barrel end is connected with right wallboard through screw, and the outside of housing barrel is provided with balancing weight；Housing barrel end is through spiral shell Nail is sequentially installed with limitting casing, piezoelectric vibrator and briquetting, and limitting casing and piezoelectric vibrator are placed in the import on right wallboard；Piezoelectricity shakes Son is formed by metal substrate and piezoelectric chip bonding, and piezoelectric vibrator free end is provided with frequency modulation gauge block.