Xaiv thiab txhim kho cov thermocouples kom raug yog lub hauv paus ntawm kev txhim khu kev qha kub khiav kev ua tau zoo, cuam tshuam ncaj qha rau qhov kub thiab txias, kev ua haujlwm ntev, thiab qhov zoo. Ua raws li kev lag luam kev coj ua zoo tshaj plaws ua kom muaj kev tswj xyuas thermal zoo thiab txo qis kev ua tsis tiav ntxov.
Kev xaiv cov thermocouple zoo tshaj plaws
1. Xaiv hom zoo rau qhov kub thiab txias:
• K-hom (chromel-alumel): 0-1260 degree, tus qauv rau cov neeg ua haujlwm kub (200-400 degree), tus nqi qis, kev ruaj ntseg zoo.
• J-type (hlau-constantan): 0-750 degree, tus nqi qis, haum rau<300°C applications.
• N‑type (nicrosil‑nisil): 0–1300°C, higher stability than K‑type at >350 degree, zoo tagnrho rau LCP / PPS high-temperature molding.
2. Qhia meej txog cov ntxhia-insulated (MI) kev tsim kho kom ruaj khov:
MI thermocouples muaj ib qho kev sib txuas ntawm magnesium oxide rwb thaiv tsev ntawm cov thermoelement thiab hlau sheath (Inconel 600 lossis 316 stainless hlau). Lawv tiv thaiv kev co, oxidation, thiab ya raws, kav ntev li 2-3 zaug ntev dua li cov khoom siv insulated.
3. Sib tw txoj kab uas hla & ntev rau daim ntawv thov:
• Txoj kab uas hla: 1.0 mm (compact, ceev teb) rau nozzles; 1.5 hli (ntau dua) rau manifolds.
• Ntev: Xyuas kom lub taub ncav mus txog hauv qab ntawm lub bore; zam dhau qhov ntev uas ua rau khoov kev ntxhov siab.
4. Xaiv cov ntaub ntawv sheath rau chemical compatibility:
• Inconel 600: Resistant oxidation thiab sulfur corrosion, zoo tagnrho rau engineering plastics feem ntau.
• 316 stainless hlau: Zoo dua tiv thaiv acid hydrolysis, haum rau PET / PLA zaub mov-qib daim ntaub ntawv.
Installation Cov kev coj ua zoo tshaj plaws
1. Ua kom muaj kev sib cuag hlau-rau-hlau zoo meej:
The thermocouple tip must seat firmly against the bottom of the drilled bore in the manifold/nozzle. Gaps >0.1 hli ua rau qeeb teb thiab drift; ntxuav lub bore ntawm carbon los yog khib nyiab ua ntej installation.
2. Torque rau cov chaw tsim khoom specifications:
Siv lub torque wrench kom nruj compression haum rau 1.5–2.5 N·m. Over-tightening crushes lub sheath thiab lov lub internal hlau; under-tightening ua rau xoob kev sib cuag thiab tsis sib xws.
3. Cov kab hluav taws xob nrog kev kho kom zoo:
• Khaws lub vojvoog dabtsi yog khoov yam tsawg kawg nkaus ntawm 50 mm kom tsis txhob muaj cov xaim sab hauv.
• Cia li 50–100 mm ntawm slack ntawm pwm nkag cov ntsiab lus kom tsis txhob nro thaum clamping/qhib.
• Ruaj ntseg cov cables nrog clamps los yog conduits kom tsis txhob rub tawm ntawm cov npoo ntse lossis cov khoom txav.
4. Saib xyuas polarity nruj me ntsis:
K-hom thermocouples siv liab=tsis zoo, daj=zoo; J-hom siv liab=tsis zoo, dawb=zoo. Rov qab polarity ua rau tus maub los qhia qhov txo qis thaum cua sov, ua rau overheating thiab heater burnout.
5. Tiv thaiv cov khoom sib txuas los ntawm cov cua sov & kev sib kis:
Siv cov kub kub (500 degree) kub-plated connectors los tiv thaiv oxidation. Mount connectors deb ntawm cov hluav taws xob hluav taws xob ncaj qha thiab yaj txoj hauv kev; npog nrog cov khau tiv thaiv hauv qhov chaw hnyav.
Txhim kho cov kev coj ua zoo tshaj plaws
• Calibrate txhua 6 lub hlis: Sib piv cov ntawv nyeem rau cov ntsuas ntsuas kub; hloov yog drift tshaj ± 1.5 degree.
• Tshawb xyuas peb lub hlis twg: Xyuas cov cables rau kev puas tsuaj, cov khoom txuas rau corrosion, thiab fittings kom nruj.
• Replace preventively: Change thermocouples every 12–18 months in high‑cycle (>10,000 cycles / hli) pwm.
Hauv cov ntsiab lus, cov kev coj ua zoo tshaj plaws rau cov thermocouples yog: xaiv MI kev tsim kho kom haum rau qhov kub thiab txias / cov khoom siv, nruab nrog kev sib cuag nrog cov hlau nruj thiab kho lub zog kom raug, cov kab hluav taws xob nrog cov strain nyem, thiab tswj nrog kev ntsuas tsis tu ncua. Cov kauj ruam no xyuas kom meej, txhim khu kev qha thermal tswj.
