Kev Tsim thiab Cov Khoom Siv ntawm Lub Hub Turbine Cua
Hauv lub tshuab cua turbine, lub hub yog ib qho tseem ceeb uas feem ntau tsis quav ntsej vim tias feem ntau qhov kev tsom mus rau yog nyob rau ntawm cov hniav, lub pej thuam, lossis lub tshuab hluav taws xob. Qhov tseeb, lub hub ua haujlwm ua "lub plawv tshuab" uas txuas cov hniav turbine rau lub ncej tseem ceeb, xa cov khoom thauj aerodynamic thiab gravitational, thiab tseem ua haujlwm ua qhov chaw sib koom ua ke rau ntau yam mechanisms xws li lub pitch system (kev hloov lub kaum sab xis ntawm cov hniav), bearings, thiab sensors. Tsab xov xwm no tham txog cov ntsiab cai tsim ntawm cov turbine turbines hubs, qhov kev xav tau ntawm cov khoom thauj uas lawv yuav tsum tau ua, thiab cov khoom siv xaiv thiab kev xav txog.
1. Kev Ua Haujlwm thiab Txoj Haujlwm ntawm Hub hauv Cua Turbine
Lub hub nyob rau ntawm pem hauv ntej ntawm lub nacelle, muab qhov kev sib txuas tseem ceeb ntawm lub rotor (blades) thiab lub drivetrain (shaft, gearbox—yog tias muaj, thiab generator). Hauv cov turbines 3-blade niaj hnub no, lub hub feem ntau muaj peb lub blade mounting points uas sib nrug 120°. Hauv cov turbines uas tswj tau pitch, txhua lub blade raug txuas rau lub hub ntawm lub pitch bearing, uas cia cov blades tig los tswj kev nqa, tswj lub zog, thiab tiv thaiv lub turbine thaum muaj cua hlob heev.
Ntxiv rau qhov ua lub qauv tseem ceeb, lub hub kuj tseem ua haujlwm ua "thawv" lossis tsev rau cov khoom: cov actuators suab (hydraulic lossis hluav taws xob), lubrication systems, seals, thiab cable thiab sensor routes. Vim tias nws nyob rau sab tig, lub hub yuav tsum tau tsim kom me me, ruaj khov, thiab muaj peev xwm ua haujlwm hauv ntau yam huab cua - los ntawm cov av noo siab, pos huab ntsev (offshore), qhov kub qis, mus rau cov voj voog thauj khoom uas tshwm sim ntau txhiab mus rau ntau lab zaug thaum lub sijhawm ua haujlwm ntawm lub turbine.
2. Cov Khoom Thauj Khoom Ua Haujlwm rau ntawm Hub
Kev tsim lub hub tsis yog tsuas yog ib qho teeb meem ntawm "tuab thiab muaj zog," tab sis yuav tsum tau nkag siab zoo txog kev sib xyaw ua ke ntawm cov khoom hnyav. Cov khoom hnyav tseem ceeb suav nrog:
1. Aerodynamic load ntawm cov hniav
Cua tsim cov zog nqa thiab lub zog rub uas xa mus rau lub hub. Kev hloov pauv ntawm qhov ceev ntawm cua thiab cua daj cua dub ua rau muaj kev hloov pauv ntawm cov khoom thauj.
2. Lub zog gravity
Thaum lub rotor tig, txhua tus hniav hloov pauv kev taw qhia raws li lub ntiajteb txawj nqus, tsim kom muaj lub voj voog thauj khoom tsis tu ncua ntawm lub hub thiab cov pob qij txha hniav.
3. Lub zog centrifugal
Lub rotor tig ua rau muaj lub zog centrifugal loj heev raws cov hauv paus hniav, uas raug xa mus rau lub hub. Lub nra hnyav no feem ntau "rub" cov hniav tawm ntawm qhov chaw nruab nrab.
4. Kev poob siab thiab kev thauj khoom hnyav heev
Cov no suav nrog cua hlob heev, nres thaum muaj xwm txheej ceev, poob lub grid, lossis cov xwm txheej txiav qhov ceev ntawm cua. Hauv cov xwm txheej no, lub hub tuaj yeem ntsib kev nce siab ntawm lub zog torque thiab cov khoom khoov.
5. Kev qaug zog ntawm lub cev
Cov tshuab cua turbine tau tsim los ua haujlwm tau 20-25 xyoo, yog li lub hub yuav tsum tiv taus ntau lub voj voog thauj khoom rov ua dua. Kev qaug zog feem ntau yog qhov tseem ceeb hauv kev ntsuas qhov loj me thiab kev xaiv cov khoom siv.
Vim yog qhov kev sib xyaw ua ke ntawm cov khoom thauj no, cov hubs feem ntau raug tshuaj xyuas siv txoj hauv kev ntxhov siab ntau yam thiab raug lees paub siv cov qauv kev tshuaj xyuas finite element (FEA) thiab cov qauv tsim xws li IEC 61400.
3. Lub Tswv Yim Tsim Qauv Hub
Geometrically, cov hubs tuaj yeem muab faib ua ntau hom dav dav:
a. Lub hub peb sab caj npab
Qhov no yog qhov kev tsim qauv feem ntau rau lub cav turbine 3-hniav. Nws zoo li lub hub nruab nrab nrog peb "caj npab" qhov twg cov kabmob pitch tau teeb tsa. Txhua caj npab yuav tsum tiv taus lub zog khoov ntawm cov hniav thaum tib lub sijhawm xa nws mus rau lub hub nruab nrab.
b. Lub hub me me nrog lub tsev nyob sab hauv
Hauv cov turbines niaj hnub no, lub kaw lus pitch feem ntau nyob hauv lub hub kom tiv thaiv nws ntawm ib puag ncig thiab txo cov kev cuam tshuam aerodynamic. Yog li ntawd, qhov chaw sab hauv yuav tsum loj txaus yam tsis muaj kev cuam tshuam rau cov qauv.
c. Lub hub rau lub turbine tsav ncaj qha
Rau cov turbines uas tsis muaj gearboxes, qhov kev tsim drivetrain txawv, ua rau kev sib koom ua ke ntawm lub hub nrog lub ntsiab bearing thiab generator tseem ceeb dua. Txawm hais tias lub hub tseem nyob rau sab rotor, cov loads hloov mus rau lub ntsiab qauv tuaj yeem faib sib txawv.
Hauv kev tsim qauv, cov engineers feem ntau tsom mus rau qhov sib npaug ntawm lub zog, kev tawv, qhov hnyav, thiab kev yooj yim ntawm kev tsim khoom thiab kev saib xyuas. Qhov hnyav ntawm lub hub ntau dhau ua rau lub nra hnyav ntawm cov bearings tseem ceeb thiab lub yaw system nce ntxiv, thaum qhov hnyav tsawg dhau ua rau muaj kev puas tsuaj ntawm kev qaug zog.
4. Cov Cheeb Tsam Tseem Ceeb hauv Kev Tsim Hub
Qee qhov chaw hu ua hub chaw uas muaj kev ntxhov siab, yog li ntawd yuav tsum tau saib xyuas tshwj xeeb:
- Interface pitch bearing: lub bolt thiab flange cheeb tsam yuav tsum muaj peev xwm tiv taus tensile-compressive thiab shear loads.
- Kev hloov pauv ntawm caj npab mus rau lub cev: kev hloov pauv ntawm qhov seem hla ua rau muaj kev ntxhov siab ntau. Cov duab radius thiab cov khoom siv txhawb nqa hauv zos feem ntau siv.
– Hub–lub qhov txuas ntawm lub ncej loj: qhov kev sib txuas (piv txwv li flange) yuav tsum muaj zog tiv taus torque thiab bending moments.
– Cov qhov, cov kev cable thiab kev nkag mus rau vaj huam sib luag: cov yam ntxwv no yog qhov tseem ceeb rau kev pabcuam, tab sis tuaj yeem ua rau lub qauv tsis muaj zog yog tias tsis tsim kom zoo.
Yog li ntawd, cov qauv tsim niaj hnub no feem ntau vam khom FEA-raws li kev ua kom zoo dua qub, suav nrog kev xaiv cov phab ntsa tuab, cov qauv tav sab hauv, thiab kev tso cov khoom ruaj khov.
5. Cov Khoom Siv Rau Lub Turbine Hub: Kev Xaiv Thiab Kev Xav Txog
Cov ntaub ntawv hub yuav tsum ua tau raws li cov cai hauv qab no: lub zog siab, tiv taus kev qaug zog zoo, tawv kom tiv taus kev poob siab, thiab kev tsim khoom tas mus li.
a. Hlau cam khwb cia nodular (hlau cam khwb cia ductile / hlau graphite spheroidal)
Qhov no yog cov khoom siv feem ntau rau cov cua turbine loj.
Kev Zoo Tshaj Plaws:
- Zoo tagnrho rau cov duab nyuaj (castings) xws li cov hubs nrog cov tes tsho thiab cov qhov sab hauv.
- Kev tiv taus qaug zog zoo rau cov ntawv thov loj.
- Cov nqi tsim khoom pheej yig dua li cov hlau loj loj.
- Kev co zoo dua li hlau, pab txo cov lus teb dynamic.
Tantangan:
- Kev tswj xyuas zoo yog qhov tseem ceeb: qhov porosity, inclusions, thiab casting defects tuaj yeem txo qhov kev siv zog ntawm cov khoom.
- Yuav tsum muaj cov txheej txheem tshuaj xyuas nruj (NDT xws li kev kuaj ultrasonic, radiography) thiab kev tswj hwm cov txheej txheem casting.
Ib qho piv txwv ntawm cov khoom siv feem ntau (feem ntau) yog tsev neeg EN-GJS (graphite kheej kheej), uas raug xaiv raws li lub zog tensile thiab ductility uas xav tau.
b. Cov hlau cam khwb cia los yog cov hlau forged
Hlau yog siv thaum xav tau lub zog thiab kev tawv dua, tshwj xeeb tshaj yog rau qee qhov kev tsim lossis cov xwm txheej hnyav.
Kev Zoo Tshaj Plaws:
- Cov khoom siv kho tshuab siab: lub zog thiab kev tawv ncauj feem ntau zoo dua.
- Zoo dua "zam txim" ntawm kev tawg hauv qee qhov xwm txheej yog tias qhov zoo ntawm cov hlau zoo.
Tantangan:
- Cov txheej txheem tsim khoom kim dua thiab nyuaj dua, tshwj xeeb tshaj yog rau cov khoom loj.
- Kev pheej hmoo ntawm kev hloov pauv thiab xav tau kev kho cua sov ntau dua.
- Cov hlau castings kuj tseem muaj kev phom sij rau qhov casting defects yog tias cov txheej txheem tsis zoo tshaj plaws.
Hauv qee qhov kev tsim qauv, qee qhov chaw siv hlau (piv txwv li flanges lossis inserts) ua ke nrog lub cev tseem ceeb kom ua tiav kev sib xyaw ua ke ntawm kev ua tau zoo thiab tus nqi.
c. Cov ntaub ntawv sib xyaw lossis cov ntaub ntawv sib xyaw (tseem txwv)
Kev siv cov khoom sib xyaw ua ke rau cov hubs tseem tsawg heev vim yog cov bearings thauj khoom ntau thiab cov kev xav tau sib xyaw ua ke nyuaj (bearings, bolts, flanges). Txawm li cas los xij, kev tshawb fawb txog cov qauv sib xyaw - piv txwv li, cov khoom sib xyaw nrog cov hlau ntxig - tau nce av los txo qhov hnyav.
Cov txiaj ntsig zoo:
- Kev txo qis ntawm qhov hnyav.
- Kev tiv thaiv corrosion zoo (tshwj xeeb tshaj yog offshore).
Kev cuam tshuam:
- Cov teeb meem kev sib txuas ntawm cov khoom siv thiab kev ntxhov siab hauv thaj chaw ntsia hlau.
- Kev txheeb xyuas qhov qaug zog mus sij hawm ntev yog qhov nyuaj dua.
- Cov nqi khoom siv thiab cov txheej txheem tsim khoom.
6. Kev Tiv Thaiv Kev Xeb thiab Kev Ua Kom Tiav Ntawm Qhov Chaw
Cov hubs ua haujlwm sab nraum zoov tau ntau xyoo, yog li kev tiv thaiv xeb yog qhov tseem ceeb. Feem ntau siv:
– Txheej txheem pleev xim txheej (primer + intermediate + topcoat) raws li qeb ib puag ncig (onshore/offshore).
- Kev kaw ntawm cov pob qij txha thiab cov chaw tseem ceeb kom tiv thaiv dej nkag.
- Kev tswj xeb galvanic thaum muaj kev sib xyaw ua ke ntawm cov khoom sib txawv (piv txwv li cov ntsia hlau stainless hlau nrog cov hlau cam khwb cia).
- Offshore, cov lus qhia txog txheej txheem feem ntau yog nruj dua thiab tuaj yeem ua ke nrog kev tiv thaiv cathodic ntawm qee qhov chaw, txawm tias lub hub nws tus kheej nyob saum hiav txwv.
Ntxiv rau qhov xeb, qhov zoo ntawm qhov chaw thiab kev kho ntawm cov pob qij txha bolted tseem cuam tshuam rau qhov qaug zog. Cov chaw ntxhib lossis qhov tsis zoo dhau tuaj yeem yog qhov pib ntawm kev tawg.
7. Kev Tsim Khoom thiab Kev Tshuaj Xyuas Zoo
Hubs feem ntau yog tsim los ntawm kev casting ua raws li:
- Kev kho cua sov kom tau txais cov khoom siv kho tshuab xav tau,
- Kev ua haujlwm precision ntawm cov rooj zaum ntawm cov kabmob, flanges, thiab cov qhov ntsia hlau,
- Kev sib npaug kom ntseeg tau tias lub rotor tsis ua rau muaj kev co ntau dhau,
– NDT (Kev Ntsuas Tsis Ua Rau Puas Tsuaj) xws li UT/RT/MT/PT los nrhiav cov qhov tsis zoo.
Kev tswj xyuas qhov zoo yog qhov tseem ceeb vim tias qhov ua tsis tiav ntawm lub hub tuaj yeem muaj cov teeb meem loj: lub sijhawm tsis ua haujlwm ntev, tus nqi crane siab, thiab kev pheej hmoo kev nyab xeeb.
Xaus
Kev tsim lub hub turbine cua yog kev sib xyaw ua ke ntawm kev tsim kho vaj tse, kev ua haujlwm, kev tsim khoom, thiab kev saib xyuas mus sij hawm ntev. Lub hub yuav tsum tiv taus cov khoom thauj aerodynamic, gravitational, centrifugal, thiab kev qaug zog ntau dhau ntawm ntau lub voj voog, thaum tseem sib dua txaus kom tsis txhob muaj kev thauj khoom ntau dhau ntawm lub kaw lus. Hais txog cov ntaub ntawv, cov hlau cam khwb nodular yog qhov kev xaiv tseem ceeb vim nws tsim nyog rau cov duab nyuaj thiab nws txoj kev lag luam, thaum cov hlau cam khwb lossis wrought yog qhov nyiam dua thaum xav tau cov khoom siv kho tshuab siab dua. Yav tom ntej, cov ntaub ntawv sib xyaw thiab kev tsim qauv pab txhawb kev simulation yuav dhau los ua ntau dua, tshwj xeeb tshaj yog rau cov turbines loj thiab cov ntawv thov offshore uas xav tau kev ua tau zoo dua thiab kev ruaj khov hauv cov chaw ib puag ncig hnyav.
Yog tias koj xav tau, kuv tuaj yeem ntxiv ib ntu tshwj xeeb rau: kev suav cov khoom siv yooj yim ntawm lub hub, piv txwv ntawm kev teeb tsa lub suab (hluav taws xob vs hydraulic), lossis cov ntsiab lus luv luv ntawm cov qauv IEC rau kev tsim lub hub.
