Tag nrho cov hlau Cheebtsam ntawm kub khiav manifolds, nozzles thiab thermocouple sheaths nthuav thiab cog lus dua nyob rau hauv cyclic siab kub thiab txias. Cov ntaub ntawv sib txawv ntawm cov khoom sib txawv muaj qhov sib txawv thermal expansion coefficient; mismatched expansion tus nqi ntawm thermocouple ntsuas Cheebtsam thiab kub khiav lub hauv paus hlau yuav tsim kev sib cuag tsis sib haum, uas maj nce thermal kuj thiab ua rau tsis tu ncua kub drift ntau txhiab molding cycles. Cov kws tsim pwm feem ntau tsuas yog tsom rau qhov kub thiab txias ntawm qhov ntev ntawm cov khoom siv, tsis quav ntsej qhov sib piv ntawm cov coefficients nthuav dav, ua rau muaj kev sib cuag tsis zoo nyob rau hauv ntev - khiav pwm ntau lawm.
Standard thermal expansion parameters ntawm mainstream thermocouple sheath ntaub ntawv: 304 stainless hlau muaj ib tug expansion coefficient ntawm 17.2 × 10⁻⁶ / degree; 316L stainless hlau yog 16.0 × 10⁻⁶ / degree; Inconel 600 npib tsib xee-chromium alloy poob rau 12.8 × 10⁻⁶/℃. Kub khiav manifolds thiab nozzles feem ntau yog ua los ntawm H13, 8407 kub ua hauj lwm pwm hlau nrog ib tug expansion coefficient nyob ib ncig ntawm 11.5 ~ 13.0 × 10⁻⁶ / degree. Inconel sheath thermocouples feature ze li cov ntaub ntawv nthuav dav nrog cov pwm hlau, yog li qhov sib cuag ntawm lub hauv paus ntsuas thiab manifold yuav tsis sib cais ntau tom qab cua sov thiab cua txias. Stainless hlau sheaths nthuav dav ntau dua li cov pwm hlau, thiab ntsuas lub nplhaib lossis khawm lub hauv paus yuav koov me ntsis hauv qhov kub thiab txias, ua rau cov pa me me thaum pwm txias. Qhov sib txawv no khaws cov carbonized yas residues thaum lub sij hawm rov ua dua, tsis tu ncua kev tiv thaiv thermal tiv thaiv hli ib hlis.
Caij nplooj ntoos hlav hu rau thermocouples ntsib qhov kev nthuav dav tsis sib haum xeeb. Nyias 304 lub caij nplooj ntoos hlav rings nthuav ntau sai dua lub cev tsis muaj steel; Tom qab kaum ob lub voj voog cua sov, lub caij nplooj ntoos hlav poob ua ntej - compression quab yuam, ua rau tsis tiav wrapping nyob ib ncig ntawm lub nozzle sab nrauv phab ntsa. Qhov sib txawv thaiv cov cua sov hloov mus, thiab tus maub los tau txais cov cim tsis muaj qhov kub thiab txias kom dhau lub rooj vag, nqa salivation, xaim kos duab thiab dub speck tsis xws luag. High-elastic beryllium tooj liab springs yog tsim tshwj xeeb rau offset expansion sib txawv; lawv adjustable elastic deformation compensates seem hloov pauv ntawm thermal expansion, tswj xoom-kev sib cuag txawm tias sheath thiab puag hlau nthuav asynchronously.
Ntsia hlau-nyob rau hauv kev sojntsuam kev sib tw cov cai raws li expansion coefficients. Rau siab - kub ntev - lub voj voog tsheb thiab PEEK pwm nrog H13 steel manifolds, Inconel M3 / M4 ntsia hlau sojntsuam yog qhov tseem ceeb xaiv kom phim cov pwm hlau nthuav dav. Nruab nrab- kub ntim pwm siv 316L manifolds tuaj yeem txais 316L sheath sojntsuam nrog kev txhawb zog compression torque thaum lub sijhawm teeb tsa kom txo qis qhov sib txawv. Tsawg-tus nqi 304 sheath thermocouples tsuas yog tsim nyog rau kev sib tshuam ib leeg- hloov pauv pwm nrog kev ua haujlwm luv luv, thiab yuav tsum nce thermal conductive paste txheej thickness thaum sib dhos los ua kom nthuav dav -vim qhov khoob.
Standardized txij nkawm countermeasures rau expansion mismatch faults. Thaum lub sij hawm peb lub hlis twg disassembly tu, xyuas kom xoob cov kab sib txuas ntawm lub hauv paus ntsuas thiab lub caij nplooj ntoos hlav rings. Yog tias pom tseeb qhov sib txawv tshwm sim, hloov cov hlau tsis muaj lub caij nplooj ntoos hlav nrog beryllium tooj liab elastic qhov chaw, lossis txhim kho stainless hlau sojntsuam rau Inconel sheathed qauv. Re-tighten compression screws with torque wrenches after every cleaning to restore pre-compression force poob los ntawm thermal expansion. Siv siab -kub hloov pauv thermal conductive muab tshuaj txhuam nrog zoo ductility; nws yuav tsis tawg tom qab rov nthuav dav thiab kev cog lus, tsis tu ncua txhaws micro qhov khoob uas tsim los ntawm cov hlau tsis sib xws.
Kev tiv thaiv tsim tawm tswv yim hauv thermocouple customization theem. Thaum xa cov khoom pwm steel thiab cov ntaub ntawv txuas ntxiv mus rau cov chaw muag khoom, thov cov ntaub ntawv sheath txuam raws li thermal expansion coefficient sib xws. Pwm khiav 24-teev tsis yog- nres ntau lawm yuav tsum tsis txhob muaj qhov sib txawv loj ntawm 304 stainless hlau thermocouples nkaus, tshem tawm mus ntev drift zais qhov phom sij tshwm sim los ntawm kev nthuav dav tsis sib haum.
