Matching Sheath Materials to Operating Conditions for 6x6mm Square Cartridge Heaters

Plastics processor hloov mus rau ib yam khoom tshiab uas muab cov pa corrosive thaum nws yaj. Tsis pub dhau lub lis piam, cov cua sov thoob plaws lub tsev pib tawg. Cov cua sov zoo rau sab nraud, tab sis cov teeb meem nyob rau hauv los ntawm corrosion ntawm lub sheath tau nres tsim ntau zaus. Cov khoom siv hluav taws xob qub zoo li zoo txaus, tab sis nws tsis xav txog tias cov khoom siv tshiab yuav ua rau qhov tsis zoo. Qhov xwm txheej no qhia tau hais tias ib qho kev xaiv tseem ceeb uas tib neeg feem ntau tsis nco qab txog txog thaum muaj teeb meem tshwm sim: cov khoom siv sheath ua haujlwm zoo npaum li cas nrog rau kev ua haujlwm.

Cov txheej txheej ntawm 6x6mm square cartridge rhaub muaj ntau yam siv. Nws tuav cov khoom sab hauv, ua kom cov hlau tsis muaj zog thiab cov rwb thaiv tsev tsis zoo los ntawm cov av thiab lwm yam hauv ib puag ncig, thiab txav cua sov mus rau qhov chaw ua haujlwm. Lub sheath yuav tsum tau ua los ntawm cov khoom siv uas tuaj yeem ua haujlwm kub thiab tiv taus cov khoom corrosive nyob ib puag ncig. Txawm hais tias ua tau zoo npaum li cas ntawm lub tshuab cua sov ua kom zoo, xaiv cov khoom tsis raug yuav ua rau nws ua tsis tau sai.


Cov khoom siv feem ntau siv rau 6x6mm square cartridge heaters yog stainless hlau 304. Nws tuaj yeem ua haujlwm tsis tu ncua ntawm qhov kub txog li 450 degrees Celsius thiab feem ntau tiv taus corrosion feem ntau - hom phiaj daim ntawv thov . 304 stainless hlau yog qhov zoo rau ntau cov pwm cua sov txoj hauj lwm, tshwj xeeb tshaj yog cov uas ua hauj lwm nrog cov yas xws li polypropylene thiab polyethylene. Nws muaj kev sib xyaw zoo ntawm tus nqi, muaj, thiab kev ua tau zoo uas ua rau nws muaj txiaj ntsig zoo rau ntau yam.

Ntxiv molybdenum rau stainless hlau 316 ua rau nws nyob deb dua rau corrosion. Cov khoom no tuaj yeem tiv taus cov tshuaj chlorides thiab ntau yam tshuaj uas yuav ua rau puas tsuaj 304. 316 stainless hlau kav ntev dua li lwm hom hlau thaum ua hauj lwm nrog PVC, uas emits hydrochloric acid thaum nws melts . 316 qhov zoo dua rau corrosion kuj zoo rau marine tej yam kev mob thiab daim ntaub ntawv uas raug rau huab cua nrog ntsev nyob rau hauv nws. Hauv cov chaw nyuaj no, cov nuj nqis ntxiv feem ntau them rau nws tus kheej los ntawm kev ua kom lub neej ua haujlwm ntev dua.

Thaum kub siab dhau rau cov hlau tsis xeb los yog thaum corrosion tau phem heev, Incoloy sheaths tuaj rau hauv kev ua si. Cov npib tsib xee no -chromium- hlau alloy nyob ruaj khov thiab tsis xeb mus txog li 700 degrees Celsius. Qhov no ua rau nws zoo rau siab -kub siv xws li kub khiav manifolds uas siv cov khoom siv siab tshaj plaws. Incoloy tseem zoo dua li cov hlau tsis muaj steel ntawm kev tiv thaiv kev ntxhov siab corrosion hauv qee yam tshuaj. Cov khoom siv kim dua li cov hlau tsis muaj steel, tab sis nws tuaj yeem siv rau hauv txoj kev uas stainless hlau tsis tuaj yeem.

Nickel sheaths yog lwm qhov kev xaiv rau kev siv qee yam. Hauv kev txo cov huab cua thiab qee yam tshuaj lom neeg, cov nickel ntshiab yog tiv taus corrosion heev. Nws kuj muaj cov thermal conductivity zoo dua li cov hlau tsis muaj steel, uas tuaj yeem pab kom sov txav mus los zoo dua hauv qee qhov kev teeb tsa. Nickel sheaths tuaj yeem muab tso rau hauv lub xeev softer uas cia lawv flex nyob rau hauv nkhaus grooves. Stainless hlau tsis tuaj yeem ua qhov no. Annealed npib tsib xee sheaths muab 6x6mm square heaters cov duab lawv xav tau mus raws li tsis yog - txoj kab.

Txhawm rau kom nkag siab qhov chaw ua haujlwm, koj yuav tsum tau saib ntau tshaj qhov tsuas yog qhov kub siab tshaj plaws. Corrosion tuaj yeem tshwm sim thaum hlau raug cov av noo thiab noo noo. Qhov no tuaj yeem ua rau pitting thiab, thaum kawg, sheath penetration. Thaum dej-cov pwm txias tsis siv, lawv tuaj yeem ua rau muaj qhov sib xyaw ua ke, uas tuaj yeem ua rau cov hlau tsis zoo thaum lub sijhawm. Cov khoom siv ua zaub mov thiab lwm yam uas yuav tsum tau ntxuav feem ntau xav tau cov ntaub ntawv sheath uas tuaj yeem ua rau cov tshuaj thiab cov dej noo.

Lub sheath koj xaiv kuj nyob ntawm seb koj nyob nraum cua sov los yog ua. Qee cov yas muab cov khoom siv corrosive thaum lawv rhuab. Fluoropolymers zoo li PTFE tuaj yeem tso tawm cov tshuaj fluorine uas ua rau cov hlau puas ntau. Polyvinyl chloride muab tawm hydrochloric acid. Qee cov roj hmab sib txuas muaj cov sulfur hauv lawv uas noj tam sim ntawm cov hlau tsis tu ncua. Rau cov kev siv no, cov ntaub ntawv sheath yuav tsum tau xaiv raws li cov corrosives uas muaj nyob rau ntawm qhov chaw ua hauj lwm kub.

Lead nkag sealing thiab sheath xaiv cov khoom ua haujlwm ua ke. Qhov chaw uas cov xaim hluav taws xob sab hauv txuas mus rau sab nraud yuav tsum tau tiv thaiv los ntawm ya raws thiab av. Epoxy seals ua tau zoo ntawm qhov kub qis, tab sis lawv tawg thiab ua tsis tiav thaum qhov kub siab tshaj li 150 degrees Celsius. Ceramic seals tuaj yeem tiv taus qhov kub siab dua, tab sis lawv tuaj yeem tawg yog tias lawv poob siab lossis vibrated. Hauv qee qhov kev siv kub siab -, cov khoom siv kaw tau siv. Hauv cov xwm txheej no, cov khoom siv sheath nws tus kheej ua rau lub foob los ntawm kev tsim tshwj xeeb.

Lub thickness ntawm sheath kuj cuam tshuam nws ua haujlwm zoo npaum li cas thiab nws kav ntev npaum li cas. Thicker sheaths ua rau cov hlau muaj zog dua thiab muab cov khoom siv ntau dua los tiv thaiv corrosion, tab sis lawv kuj ua rau nws nyuaj rau cov cua sov txav ntawm cov hlau thiab cov khoom ua haujlwm. Thinner sheaths cia cua sov txav los ntawm lawv zoo dua, tab sis lawv tsis tiv thaiv kev puas tsuaj los ntawm cov neeg kho tshuab quab yuam lossis corrosion ib yam. Qhov chaw muaj rau 6x6mm square heaters txwv lub thickness ntawm sheath, yog li qhov kev xaiv yuav tsum yog ntawm kev tiv thaiv thiab kev ua tau zoo.

Txoj kev uas koj txhim kho tej yam kuj cuam tshuam rau ntev npaum li cas lub sheath kav. Nicks, khawb, los yog dents uas tshwm sim thaum lub sij hawm installation ua rau cov chaw tsis muaj zog uas corrosion tuaj yeem tsim los yog qhov chaw muaj kev ntxhov siab tuaj yeem ua rau tawg. Kev siv cov cuab yeej thiab cov txheej txheem tsim nyog thaum txhim kho ua kom lub plhaub tsis zoo. Rau cov cua sov uas yuav tsum tau muab tshem tawm thiab muab tso rau hauv, ceev faj tuav kom puas los ntawm kev tsim kho uas yuav tsis pom tseeb tab sis yuav ua rau lub rhaub lub neej luv.