Viscosity yog cov cuab yeej ntawm lub cev ntawm cov kua dej uas ntsuas nws cov kev tiv thaiv sab hauv kom ntws thiab deformation.
Roj viscositypiav qhia tias cov roj ntws tau yooj yim npaum li cas, thiab nws cuam tshuam ncaj qha rau lubrication, txias, sealing, thiab kev ua haujlwm ntawm qhov kub sib txawv.
High viscosity=roj yog tuab, qeeb - ntws
Tsawg viscosity=roj yog nyias, khiav tau yooj yim
Lub luag haujlwm tseem ceeb ntawm viscosity
1. Lubrication & Hnav tiv thaiv
Ua kom ruaj khov tiv thaiv zaj duab xis ntawm cov hlau txav.
Tiv thaiv kev sib cuag ncaj qha, txo kev sib txhuam, hnav, thiab overheating.
2. Kev ua haujlwm sealing
Sau me me clearances nyob rau hauv lub cav, twj, gears, thiab hydraulic systems.
Tiv thaiv kom tsis txhob muaj roj, roj, lossis siab.
3. Damping & Shock Absorption
Absorbs mechanical vibration thiab cuam tshuam loads.
Txo cov suab nrov thiab ua kom lub neej ntev ntawm cov cuab yeej siv.
4. Txias & Kub Hloov
Nqa tawm cov cua sov uas tsim los ntawm kev sib txhuam.
viscosity tsim nyog ua kom muaj kev sib raug zoo thiab ua kom txias txias.
5. Kev Tiv Thaiv Kab Mob
Suspends hnav cov khoom, sludge, thiab impurities kom tsis txhob puas.
Pab cov lim dej huv huv kom zoo.
6. System Stability (Hydraulic, Transformers)
Nyob rau hauv hydraulic systems: xyuas kom meej lub hwj chim kis tau tus mob.
Hauv cov roj transformer: txhawb kev rwb thaiv tsev thiab cua sov dissipation.
Vim li cas nws tseem ceeb rau cov roj
Lubrication: Cov roj tuab ua rau muaj zog tiv thaiv zaj duab xis ntawm cov khoom txav.
Flow peev xwm: Cov roj nyias nyias tuaj yeem nrawm dua, tshwj xeeb tshaj yog nyob rau qhov kub thiab txias.
Txias & sealing: Viscosity cuam tshuam qhov zoo ntawm cov roj hloov hluav taws xob thiab cov ntsaws ruaj ruaj.
Yuav ua li cas kub hloov viscosity
Thaum txias: Cov roj ua kom khov (thicker).
Thaum kub: Cov roj ua kom qis qis (thinner).
Cov roj zoo yuav tsum nyob ruaj khov: tsis dhau nyias thaum kub, tsis tuab heev thaum txias.
Cov units
cSt (centistokes) - feem ntau siv rau industrial & transformer roj
mm²/s – tib yam li cSt (1 cSt=1 mm²/s)
SAE tooj (piv txwv li, SAE 5W-30) - rau cov roj cav
