Chav Seal Clearance Ntawm Chav Turbines

Radial Clearance
Rau kev xaiv ua ntej ntawm radial clearance, cov mis empirical δ=0.001d + (0.1–0.2) mm (qhov twg δ sawv cev tus nqi clearance) yuav raug siv. Cov qauv no yuav siv sij hawm ntau yam, nrog rau txoj kab uas hla ntawm ncej, cov qauv thiab cov khoom siv ntawm cov ntsaws ruaj ruaj, qhov deb ntawm cov ntsaws ruaj ruaj los ntawm kev txhawb nqa bearings, hom kev txhawb nqa bearings siv, thiab cov kev taw qhia ntawm rotor tig.

Thaum lub sij hawm tsim qauv, qhov tseem ceeb tuaj yeem raug xaiv raws li cov lus qhia hauv qab no (cov nqi me me feem ntau yog xaiv rau nruab nrab- thiab qis-siab chav turbines): Radial clearance rau ncej-kawg seals thiab diaphragm seals: Rau qhov ntxig rau -} ntu me me (nrog ntau yam 0.7mm) xaiv thaum tooj dag lossis nyiaj German siv rau cov khoom sib khi); rau qhov tseem ceeb - nplhaib hom, 0.40–0.70 mm; rau nyias - phaj hom, 0.40–0.65 mm; thiab rau cov ntoo - tsob ntoo, 0.25–0.50 mm.

Thaum cylindrical los yog elliptical txhawb nqa bearings yog ua hauj lwm thiab cov kev taw qhia ntawm kev sib hloov yog clockwise, lub radial clearance nyob rau sab laug yuav tsum yog 0-0.20 mm ntau dua li ntawm sab xis. Tsis tas li ntawd, rau lub foob pem hauv ntej ntawm qhov siab - ntu siab thiab lub diaphragm seals nyob rau hauv lub siab - theem siab, lub radial clearance nyob rau hauv qab ntawm lub foob yuav tsum yog 0.2-0.3 hli siab tshaj qhov ntawm ob sab. Radial clearance rau shroud seals: 1.5-2 mm. Radial clearance ntawm lub shroud rivet hau thiab lub foob lub cev: 2.5-3.5 hli.

Axial Clearance
Kev xaiv ntawm axial clearance qhov tseem ceeb rau txoj kev ntws ntawm cov khoom siv thiab cov ntsaws ruaj ruaj yog coj los ntawm lub hauv paus ntsiab lus uas tsis muaj kev sib txhuam axial yuav tsum tshwm sim ntawm qhov sib hloov thiab qhov chaw nyob ruaj khov nyob rau hauv ob qho tib si ib txwm muaj thiab qhov tsis raug. Tus nqi tshem tawm no tuaj yeem txiav txim siab los ntawm kev suav nrog cov thermal expansion ntawm lub rotor thiab casing thaum lub sij hawm ua hauj lwm, diaphragm deflection, thiab kwv yees ntawm qhov sib txawv expansion tshwm sim los ntawm qhov kub siab tshaj gradients thaum lub sij hawm turbine pib thiab kaw; Tsis tas li ntawd, nws tuaj yeem tsim los ntawm kev xa mus rau kev ua haujlwm nrog chav turbines.

Feem ntau, qhov kev npaj ntawm axial clearances ua raws li ib qho kev sib tw ntawm maj mam nce qhov tseem ceeb txav mus deb ntawm lub thrust bearing. Txhawm rau txhim kho qhov pib thiab kaw qhov ua tau zoo ntawm cov loj - muaj peev xwm chav turbines - yog li txo lub sij hawm xav tau rau cov txheej txheem no - qee lub tuam txhab tau siv cov tswv yim tsim tshwj xeeb. Cov no suav nrog kev nce cov axial clearances nyob rau hauv txoj kev khiav thiab chav ntsaws ruaj ruaj, tswj cov me me radial clearances rau cov chav ntsaws ruaj ruaj, thiab incorporating radial- hom seals ntawm cov hniav hauv paus chaw.