Dab tsi yog qhov kub siab tshaj plaws rau thermocouple tus pas ntsuas kub?**
** Taw qhia
Thermocouple thermometers yog dav siv nyob rau hauv ntau yam lag luam thiab kev siv rau kev ntsuas kub. Lawv paub txog lawv qhov tseeb, kev ntseeg tau, thiab ntau yam. Txawm li cas los xij, ib qho kev txiav txim siab tseem ceeb thaum siv tus pas ntsuas kub thermocouple yog qhov kub siab tshaj plaws uas nws tuaj yeem tiv taus. Nyob rau hauv tsab xov xwm no, peb yuav tshawb txog lub ntsiab lus ntawm qhov kub siab tshaj plaws rau cov thermocouple thermometers kom ntxaws, nrog rau cov yam ntxwv uas txiav txim siab nws thiab qhov cuam tshuam rau kev lag luam sib txawv.
Nkag siab Thermocouple Thermometers
Thermocouple thermometers yog cov ntsuas kub ntsuas uas tso siab rau qhov tshwm sim ntawm cov nyhuv thermoelectric. Cov nyhuv no tshwm sim thaum ob qhov sib txawv ntawm cov hlau sib xyaw ua ke ntawm ib qho kawg los ua ib qho kev sib tshuam, thiab qhov kub thiab txias yog siv los ntawm kev sib tshuam. Yog li ntawd, ib tug voltage yog generated, uas yog proportional rau qhov kub thiab txias sib txawv.
Ob lub hlau siv nyob rau hauv ib lub thermocouple hu ua qhov zoo (P) thiab qhov tsis zoo (N) ob txhais ceg. Qhov hluav taws xob tsim tawm ntawm qhov sib txuas yog ntsuas los ntawm kev sib txuas cov ceg zoo thiab qhov tsis zoo rau lub voltmeter lossis chav ntsuas kub. Los ntawm kev siv qhov ntsuas kub ntawm qhov kawg ntawm lub thermocouple Circuit Court, qhov ntsuas kub ntawm qhov ntsuas ntsuas tuaj yeem txiav txim siab.
Cov yam ntxwv cuam tshuam rau qhov kub siab tshaj plaws
Qhov kub siab tshaj plaws uas tus pas ntsuas kub thermocouple tuaj yeem tiv taus yog txiav txim los ntawm ntau yam. Cia peb tshawb xyuas cov xwm txheej no kom ntxaws:
1. Hom Thermocouple: Muaj ntau hom thermocouples muaj, xws li hom K, hom J, hom T, thiab lwm yam. Txhua hom muaj qhov sib txawv ntawm qhov kub thiab txias. Piv txwv li, hom K thermocouples feem ntau tuaj yeem ntsuas kub txog 2,300 degree (4,172 degree F), thaum hom T thermocouples tuaj yeem ntsuas kub txog 400 degree (752 degree F). Nws yog ib qho tseem ceeb uas yuav tsum xaiv hom thermocouple zoo raws li qhov ntsuas kub uas yuav tsum tau ua rau daim ntawv thov tshwj xeeb.
2. Cov khoom siv hlau: Cov ntaub ntawv siv rau qhov zoo thiab tsis zoo ob txhais ceg ntawm cov thermocouple xov hlau kuj ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab qhov kub siab tshaj plaws. Cov khoom siv hlau sib txawv muaj cov ntsiab lus sib txawv thiab cov khoom siv thermal. Nyob rau hauv dav dav, noble hlau-raws li thermocouples, xws li platinum-rhodium, muaj siab kub txwv piv rau lub hauv paus hlau thermocouples, zoo li hlau-constantan. Rau cov ntawv thov kub kub heev, cov hlau refractory zoo li tungsten thiab molybdenum yog siv rau hauv kev tsim cov thermocouple xov hlau.
3. Tiv thaiv Sheaths: Nyob rau hauv qhov chaw kub kub, cov thermocouples feem ntau yog nyob rau hauv cov ntaub thaiv npog tiv thaiv kom tsis txhob muaj kev puas tsuaj rau lub cev thiab kev sib kis. Kev xaiv ntawm cov ntaub ntawv sheath yog ib qho tseem ceeb, vim nws yuav tsum muaj lub siab melting point thiab tshuaj stability. Nyob ntawm daim ntawv thov, sheaths ua los ntawm cov ntaub ntawv xws li ceramic, stainless hlau, los yog Inconel yog siv, uas muaj peev xwm tiv taus kub li ntawm ob peb puas degrees mus rau ob peb txhiab degrees Celsius.
4. Thermal conductivity: Cov thermal conductivity ntawm cov khoom siv thermocouple hlau kuj tseem cuam tshuam rau nws qhov siab tshaj plaws kub txwv. High thermal conductivity tso cai rau kev hloov pauv ntawm cov cua sov los ntawm qhov ntsuas taw tes mus rau qhov sib tshuam. Qhov no pab ntsuas qhov ntsuas kub kom raug, tshwj xeeb tshaj yog nyob rau hauv kev hloov pauv ceev lossis kev siv kub kub. Txawm li cas los xij, cov thermal conductivity siab kuj tuaj yeem ua rau cov xaim muaj kev cuam tshuam rau thermal puas, txo nws qhov siab tshaj plaws ntawm qhov ntsuas kub.
Kev cuam tshuam rau kev lag luam sib txawv
Qhov siab tshaj plaws ntawm qhov ntsuas kub ntawm lub ntsuas kub ntawm lub thermocouple muaj qhov cuam tshuam tseem ceeb rau ntau yam kev lag luam. Cia peb tshuaj xyuas ob peb yam tseem ceeb:
1. Metallurgy thiab Foundries: Cov kev lag luam no feem ntau cuam tshuam nrog qhov kub siab heev thaum lub sij hawm hlau melting, casting, thiab kev kho cua sov txheej txheem. Thermocouples nrog qhov ntsuas kub siab yog qhov tseem ceeb rau kev saib xyuas thiab tswj cov txheej txheem no. Inconel sheathed type K thermocouples, nrog rau qhov ntsuas kub ntawm ib ncig ntawm 1,260 degree (2,300 degree F), feem ntau yog siv rau hauv cov ntawv thov.
2. Lub zog tiam: Hauv cov chaw tsim hluav taws xob, qhov chaw siv lub tshuab hluav taws xob thiab cov roj turbines ua haujlwm ntawm qhov kub thiab txias, ntsuas qhov ntsuas kub yog qhov tseem ceeb rau kev ua haujlwm zoo thiab nyab xeeb. Thermocouples muaj peev xwm tiv taus qhov kub txog li 1,100 degree (2,012 degree F) yog siv rau hauv kev saib xyuas ntawm turbines, boilers, thiab tso pa.
3. Kev lag luam semiconductor: Kev lag luam semiconductor yuav tsum tau saib xyuas qhov kub thiab txias thaum lub sijhawm tsim khoom, xws li wafer fabrication thiab diffusion. Thermocouples nrog rau qhov kub thiab txias txwv, nrog rau qhov raug zoo, yuav tsum tau ua kom cov khoom zoo sib xws. Ceramic-sheathed type S thermocouples, nrog rau qhov ntsuas kub txog li 1,600 degree (2,912 degree F), feem ntau siv rau hauv cov ntawv thov no.
4. Aerospace thiab Defense: Aerospace thiab tiv thaiv sectors feem ntau ntsib qhov kub thiab txias nyob rau hauv daim ntawv thov xws li foob pob hluav taws cav kuaj thiab cov ntaub ntawv kub-kub. Thermocouples muaj peev xwm ntsuas qhov kub siab tshaj 2, 000 degree (3,632 degree F) yog qhov tseem ceeb hauv cov cheeb tsam xav tau no.
Xaus
Hauv kev xaus, qhov kub siab tshaj plaws uas tus pas ntsuas kub thermocouple tuaj yeem tiv taus yog nyob ntawm ntau yam, suav nrog hom thermocouple, cov khoom siv hlau, cov ntaub thaiv npog, thiab thermal conductivity. Kev lag luam sib txawv xav tau cov thermocouples nrog qhov sib txawv ntawm qhov kub siab tshaj plaws los ntsuas qhov ntsuas kub hauv lawv cov ntawv tshwj xeeb. Nws yog ib qho tseem ceeb uas yuav tau xaiv cov thermocouple txoj cai thiab kev tiv thaiv sheath ua ke kom ntseeg tau tias qhov ntsuas kub zoo thiab muaj tseeb. Los ntawm kev nkag siab txog yam cuam tshuam rau qhov kub siab tshaj plaws, kev lag luam tuaj yeem txiav txim siab thaum xaiv cov thermocouples rau lawv qhov ntsuas kub xav tau.
