Lub boiling point ntawm antifreeze. Sib piv nrog antifreeze

Me ntsis ntawm physics

Nws yog qhov tsis raug los tham txog qhov kub ntawm cov tshuaj tiv thaiv kab mob hauv qhov tshwj xeeb ntawm cov tshuaj tiv thaiv kab mob, vim tias, ua ntej, tshuaj tiv thaiv kab mob muaj qee yam tshuaj muaj pes tsawg leeg, thiab nws cov yam ntxwv thermophysical yog txiav txim siab tsis yog los ntawm qhov kub thiab txias, tab sis kuj los ntawm lub siab. Thib ob, antifreeze, uas nyob rau hauv ib lub sij hawm tau tsim tshwj xeeb rau domestically tsim xyaw, muaj additives uas xyuas kom meej tsis tsuas yog lub lag luam ntawm lub tsheb ntawm qhov kub thiab txias, tab sis kuj nws tiv thaiv los ntawm ib tug xov tooj ntawm tsis zoo yam tseem ceeb:

• corrosion;
• tus nqi;
• cavitation.

Antifreeze, tsis zoo li antifreezes, tsis muaj lub lubricating nyhuv, thiab txo hnav yog ua tiav vim qhov txo qis hauv qhov kub thiab txias ntawm cov khoom txav ntawm lub tsav, nrog rau qhov nce ntawm qhov khoob tau xaiv, thiab kev sib txhuam coefficient ib txwm nce.

Yog hais tias txhua yam yog ntau dua los yog tsawg dua nrog qhov tso cai kub (tsis ntau tshaj 90^ºC), tom qab ntawd qhov xwm txheej nrog lub siab hauv lub cav yog qhov nyuaj dua. Txhawm rau tiv thaiv lub cav los ntawm overheating, antifreeze yog pumped ntawm elevated pressures, uas kuj cuam tshuam rau qhov kub ntawm cov kua. Rau feem ntau hom, qhov tseeb siab nyob rau hauv lub tog raj kheej thaiv yog tsawg kawg yog 1,2 ... 1,3 atm: nws yog ces, raws li txoj cai Clausius, qhov kub siab tshaj plaws uas yuav tsum tau rau boiling kua media nce. Yog li, qhov theoretically permissible boiling point ntawm coolants tuaj yeem yog 110 ... 112^ºC.

Dab tsi yog qhov boiling point ntawm antifreeze?

Overheating nyob rau hauv lub cav ntawm xws li nrov cua txias xov xwm xws li Felix A40, Motul, Alaska thiab lwm yam yog txuam nrog ib tug tsis txaus tus nqi ntawm antifreeze, ib tug malfunction ntawm lub cav qhov cua qhov system, cov tsos ntawm ib tug huab cua xauv, malfunction ntawm lub cua txias system, los yog ib tug malfunction ntawm lub cav cua txias system. siv cov tub yees tsis zoo (diluted, siv, thiab lwm yam). Tham txog qhov kub ntawm cov tshuaj tiv thaiv kab mob yog ua tau tsuas yog rau cov tswv lub tsheb uas tso cai rau ib qho tseem ceeb tshaj ntawm cov coolant siab thiab nws ntau tshaj ntim nyob rau hauv lub txias system. Lwm qhov yog siv cov tshuaj tiv thaiv kab mob zoo li cov kua dej tsis muaj tshuaj tiv thaiv kab mob (muas ntawm lub khw muag tsheb dubious). Cov no tuaj yeem boil, thiab txawm tias kub ntawm 90^ºC.

Thermophysical zog ntawm antifreezes ntawm domestic ntau lawm

Nyob rau hauv Lavxias teb sab cav, nws yog advisable siv antifreezes ntawm Phoenix, Sintec thiab cov zoo li hom. Lawv cov kev txwv kev ua haujlwm yog raws li hauv qab no:

1. Antifreeze A40M: -40… + 108^ºC.
2. Antifreeze A65M: -65… + 108^ºC.
3. Antifreeze A60M: -60… + 105^ºC.
4. Rau antifreeze TL-30 hwm: -30…+108^ºC.

Ntawm qhov kub thiab txias hauv lub cav siab dua li qhov tau hais tseg, cov tshuaj tua kab mob ua kom sov.

Lub coefficient ntawm volumetric expansion ntawm antifreeze yog nyob rau hauv 1,09 ... 1,12. Lwm qhov ntsuas tau txiav txim siab los ntawm cov kev cai ntawm GOST 28084-89.

Qhov ua tau boiling point ntawm antifreeze kuj kwv yees los ntawm tus nqi siab:

• P = 1 at T_{bale ua} = 105^ºC;
• P = 1,1 at T_{bale ua} = 109^ºC;
• P = 1,3 at T_{bale ua} = 112^ºC.

Cov neeg tsim khoom tseem ceeb ntawm cov tshuaj tiv thaiv kab mob hauv lub tebchaws yog PKF "MIG thiab Co" (Dzerzhinsk, Nizhny Novgorod cheeb tsam).

Cov ntaub ntawv boiling point ntawm antifreeze (antifreeze)