Dab tsi yog qhov ceev ntawm iav roj?
Txheem
Dab tsi txiav txim siab qhov ceev ntawm iav roj?
Qhov ntom ntawm cov kua nruab nrab tsis tuaj yeem suav nrog qhov nruab nrab ntawm cov lej ntawm cov khoom suav nrog hauv nws cov muaj pes tsawg leeg. Piv txwv li, yog tias koj sib tov 1 liter dej nrog qhov ceev ntawm 1 g / cmXNUMX3 thiab 1 liter ntawm cawv nrog qhov ceev ntawm 0,78 g / cmXNUMX3, ntawm cov zis peb yuav tsis tau 2 litres kua nrog ib tug ceev ntawm 0,89 g / cmXNUMX.3. Yuav muaj cov kua dej tsawg dua, vim tias cov molecules ntawm dej thiab cawv muaj cov qauv sib txawv thiab nyob hauv qhov chaw sib txawv. Lawv qhov kev faib tawm tsis sib xws yuav txo qhov ntim kawg.
Kwv yees li tib txoj cai ua haujlwm thaum ntsuas qhov ceev ntawm cov roj iav. Qhov tshwj xeeb lub ntiajteb txawj nqus ntawm txhua lub lubricant tivthaiv ua rau nws tus kheej hloov mus rau qhov kawg ceev tus nqi.
Qhov ntom ntawm iav roj yog tsim los ntawm ob pawg ntawm cov khoom.
- cov roj hauv paus. Raws li lub hauv paus, ib qho ntxhia hauv paus yog tam sim no siv ntau dua, tsawg dua - semi-synthetic thiab hluavtaws. Qhov tshwj xeeb lub ntiajteb txawj nqus ntawm cov pob zeb hauv av yog li ntawm 0,82 txog 0,89 g / cmXNUMX3. Synthetics yog li 2-3% sib zog. Qhov no yog vim lub fact tias thaum lub sij hawm distillation ntawm cov ntxhia hauv paus, hnyav paraffins thiab ntev chains ntawm hydrocarbons yog loj displaced (hydrocracking) los yog hloov dua siab tshiab (hnyav hydrocracking). Polyalphaolefins thiab cov roj hu ua roj kuj tseem sib zog me ntsis.
- Cov tshuaj ntxiv. Nyob rau hauv cov ntaub ntawv ntawm additives, nws tag nrho yog nyob ntawm tej yam khoom siv. Piv txwv li, thickening agents hnyav dua lub hauv paus, uas ua rau kom tag nrho qhov ntom ntom. Lwm cov additives tuaj yeem ua rau kom qhov ntom ntom thiab txo qis. Yog li ntawd, nws yog tsis yooj yim sua kom txiav txim unambiguously lub manufacturability ntawm lub additive pob tsuas yog ceev.
Qhov hnyav dua cov pob zeb hauv av, qhov tsis zoo ntawm cov roj npaj siv tau feem ntau suav tias yog.
Dab tsi cuam tshuam rau qhov ntom ntawm iav roj?
Iav roj, raws li cov khoom tiav, muaj qhov ceev ntawm 800 txog 950 kg / m3. High density indirectly qhia cov yam ntxwv hauv qab no:
- nce viscosity;
- siab cov ntsiab lus ntawm antiwear thiab huab siab additives;
- tsawg zoo meej puag.
Cov kua dej sib kis rau kev sib kis tsis siv neeg tsis tshua ncav cuag qhov ceev ntawm 900 kg / m3. Qhov nruab nrab, qhov ceev ntawm ATF kua yog nyob rau theem ntawm 860 kg / m3. Lubricants rau mechanical transmissions, tshwj xeeb tshaj yog cov tsheb thauj khoom, txog li 950 kg / m3. Feem ntau cov roj ntawm cov ntom ntom loj yog hom phiaj thiab haum rau lub caij ntuj sov ua haujlwm.
Qhov ceev ntawm cov iav roj nyhav nce ntxiv thaum lub sijhawm ua haujlwm. Qhov no yog vim lub saturation ntawm lub lubricant nrog oxides, hnav cov khoom thiab cov evaporation ntawm sib dua fractions. Thaum kawg ntawm lawv lub neej kev pab cuam, qee cov roj iav yog compacted rau 950-980 kg / m3.
Nyob rau hauv kev xyaum, xws li ib tug parameter li roj ntom yog tsis muaj nqi rau ib tug dog dig tsav tsheb. Yog tsis muaj kev tshawb fawb hauv chav kuaj, nws nyuaj rau hais ib yam dab tsi txog nws qhov zoo lossis cov khoom. Nws tsuas yog ua tau nrog cov kev xav tseem ceeb los ntsuas qhov muaj pes tsawg leeg ntawm cov additives, yog tias hom ntawm lub hauv paus paub.
