Taw qhia
Thermocouples yog dav siv nyob rau hauv ntau yam lag luam rau lawv lub peev xwm los ntsuas kub kom raug. Lub thermocouple yog ib qho khoom siv uas tsim hluav taws xob teeb liab hauv kev teb rau qhov kub thiab txias. Cov teeb liab no tuaj yeem siv los tso saib qhov kub thiab txias thiab tswj cov txheej txheem cua sov lossis cua txias hauv ntau daim ntawv thov kev lag luam. Hauv tsab xov xwm no, peb yuav tham txog lub hom phiaj ntawm thermocouple, nws ua haujlwm li cas, nws cov txiaj ntsig, thiab qhov tsis zoo.
Dab tsi yog thermocouple?
Lub thermocouple yog qhov ntsuas kub ntsuas kub uas ntsuas qhov ntsuas kub los ntawm kev ntsuas qhov hloov pauv ntawm qhov hluav taws xob tsim tawm thaum ob lub hlau sib txawv tau koom ua ke ntawm ib qho kawg. Qhov sib txawv voltage ntawm ob lub hlau yog ncaj qha proportional rau qhov kub thiab txias sib txawv ntawm ob kawg ntawm lub thermocouple. Qhov sib txawv voltage no yog hu ua thermoelectric voltage, uas yog lub hauv paus rau kev ua haujlwm thermocouple.
Lub thermocouple ua haujlwm li cas?
Lub thermocouple yog tsim los ntawm ob lub xov hlau sib txawv ntawm cov hlau sib txuas ua ke los ua ib qho 'hluav taws xob'.' Qhov sib txuas yog qhov ntsuas kub. Ib lub xaim yog "zoo" lossis cov xaim kub, thaum lwm qhov yog "tsis zoo" lossis cov xaim txias. Lub hauv paus ntsiab lus ntawm kev ua haujlwm thermocouple yog tias thaum qhov kub thiab txias ntawm qhov sib txuas hloov pauv, lub tshuab hluav taws xob thermoelectric yog tsim nyob rau hauv cov xov hlau.
Thermoelectric voltage generates ib tug tam sim no uas ntws los ntawm cov xov hlau, qhia qhov kub thiab txias sib txawv ntawm cov hlws ris thiab cov siv los yog txias hlws ris, uas yog nyob rau hauv ib tug paub qhov kub thiab txias. Los ntawm kev paub txog qhov ntsuas kub ntawm qhov kev sib tshuam, qhov ntsuas kub ntawm qhov ntsuas qhov sib txuas tuaj yeem txiav txim siab.
Dab tsi yog hom thermocouples?
Muaj ntau hom thermocouples uas siv ntau yam kev siv, raws li qhov sib txawv ntawm qhov kub thiab txias thiab ib puag ncig. Feem ntau hom thermocouples yog:
1. Hom J: tsim los ntawm cov hlau thiab cov hlau tsis tu ncua, siv nyob rau hauv qhov ntau ntawm -210 degree mus rau 1200 degree .
2. Hom K: muaj li ntawm chromel thiab alumel alloys, siv nyob rau hauv qhov ntau ntawm -270 degree mus rau 1377 degree .
3. Hom T: muaj cov tooj liab thiab cov hlau tsis tu ncua, siv nyob rau hauv qhov ntau ntawm -270 degree mus rau 400 degree .
4. Hom E: muaj li ntawm chromel thiab constantan alloys, siv nyob rau hauv qhov ntau ntawm -270 degree mus rau 1000 degree .
5. Hom N: muaj li ntawm nicrosil thiab nisil alloys, siv nyob rau hauv qhov ntau ntawm -270 degree mus rau 1300 degree .
6. Hom R: tsim los ntawm platinum thiab rhodium alloys, siv nyob rau hauv qhov ntau ntawm 0 degree mus rau 1450 degree .
Dab tsi yog cov txiaj ntsig ntawm thermocouples?
Thermocouples muaj ntau yam zoo dua lwm cov ntsuas kub, xws li:
1. Cov neeg raug siab: Thermocouples muaj qhov ua tau zoo thiab muaj peev xwm ntsuas qhov ntsuas kub nrog qhov tseeb txog li ±0.5 degree .
2. Kev ntsuas kub ntau: Thermocouples tuaj yeem ntsuas qhov kub ntawm qhov dav, ntawm -270 degree mus rau 1450 degree .
3. Lub sij hawm teb ceev: Thermocouples muaj lub sij hawm teb ceev thiab tuaj yeem kuaj xyuas qhov kub thiab txias hloov ntawm lub sijhawm.
4. Tus nqi zoo: Thermocouples yog pheej yig dua li lwm cov ntsuas kub, ua rau lawv nrov thoob plaws ntau yam kev lag luam.
5. Flexible: Thermocouples tuaj yeem siv rau hauv ntau daim ntawv thov kev lag luam, suav nrog aerospace, tsheb, tshuaj, thiab kev ua zaub mov.
Dab tsi yog qhov tsis zoo ntawm thermocouples?
Txawm hais tias lawv muaj ntau yam zoo, thermocouples muaj qee qhov tsis zoo, xws li:
1. Nonlinear teb: Thermocouples muaj cov lus teb nonlinear rau kev hloov kub, uas tuaj yeem ua rau kev ntsuas yuam kev.
2. Kev them nyiaj rau kev sib tshuam txias: Kev siv los yog kev sib tshuam txias yuav tsum tau khaws cia ntawm qhov kub thiab txias, uas yuav tsum tau siv cov khoom siv ntxiv thiab sijhawm.
3. Txwv tsis pub muaj tseeb: Thaum cov thermocouples yog qhov tseeb, lawv tsis raug raws li lwm cov ntsuas kub, xws li RTDs thiab thermistors.
4. Cov zis hluav taws xob sib txawv: Cov zis hluav taws xob ntawm cov thermocouples sib txawv nrog qhov ntsuas kub thiab hom thermocouple, ua rau nws nyuaj rau kev tsim qauv.
5. Kev teeb tsa tsis yooj yim: Kev teeb tsa ntawm cov thermocouples tuaj yeem yog qhov nyuaj, yuav tsum tau siv cov cuab yeej tshwj xeeb thiab cov neeg ua haujlwm raug cob qhia.
Xaus
Thermocouples yog dav siv nyob rau hauv ntau yam lag luam rau lawv lub peev xwm los ntsuas kub kom raug. Lawv yog cov nqi-zoo, hloov tau, thiab muaj qhov kub thiab txias. Txawm li cas los xij, lawv muaj qee qhov tsis zoo, xws li cov lus teb tsis muaj kab, cov nyiaj sib txuas txias, thiab kev teeb tsa tsis yooj yim. Txawm hais tias cov teeb meem no, cov thermocouples tseem yog qhov kev xaiv nrov rau kev ntsuas kub hauv ntau daim ntawv thov kev lag luam.
