Ukuqina kwegasket ye-PTFE ephezulu? 

Masibe yinyani, xa umntu ebuza malunga nokuqina kwe gasket ye-PTFE ephezulu, bahlala bebonisa itywina lomlingo eliphatha i-500 ° F ngonaphakade. Yindawo yokuqala esifumana kuyo. I-PTFE ilungile, kodwa iqondo lobushushu eliphezulu liyazalana, kwaye ukuqina kuxhomekeke kwinto oyicelayo ukuba iyenze. Ingaba kukuqhuba ibhayisekile eshushu? Ngaba kukho ukuvezwa kweekhemikhali phezu kobushushu? Okanye yiflange nje emileyo, eshushu? Impendulo itshintsha yonke into.

Ukungaqondi kakuhle kweTempile kunye neNyaniso yeMaterial

I-PTFE esulungekileyo iqala ukurhubuluza kakhulu ngaphezulu kwe-400°F (malunga ne-204°C). Unokufumana i-databases ethi isetyenziswe ukuya kuthi ga kwi-500 ° F (260 ° C), kwaye ngokobuchwephesha, ayiyi kunyibilika ngokukhawuleza. Kodwa kuloo mida iphezulu, iimpawu zayo zomzimba ziyathamba. I-gasket inokuhamba okubandayo, okuthetha ukuba ikhubaza kancinane phantsi komthwalo we-bolt, ekhokelela ekuphumleni koxinzelelo kunye nokuvuza ekugqibeleni. Ngoko, ukuqina kwi-250 ° C ngumbuzo wexesha kunye noxinzelelo, kungekhona u-ewe / hayi elula.

Ndikhumbula iprojekthi kumgca wekhemikhali kunye nokucoca umphunga okwethutyana. Iqondo lobushushu linganyuka liye kuma-230°C ixeshana elifutshane. Sasebenzisa a PTFE gasket, kwaye yasebenza… kangangeenyanga ezintathu. Emva koko ukuvuza kuqale kwimingxuma yeebholiti. Umba yayingengobushushu obuphezulu kwiseti nganye, kodwa imijikelo ye-thermal ephindaphindiweyo idityaniswe nokujikeleza kwe-flange ngexesha lokufakwa kwebholiti. Isixhobo saphulukana nokomelela.

Yiyo loo nto amabanga e-PTFE agcwalisiweyo engena. Izixhobo ezifana neglasi-ezaliswe yi-PTFE okanye i-PTFE ezaliswe yikhabhoni iphucula ukuxhathisa kwe-creep kakhulu. Banokusingatha imithwalo ephezulu yoomatshini kumaqondo obushushu aphakamileyo, bandise ubomi benkonzo. Kodwa nangona kunjalo, uthengisa enye ye-PTFE ecocekileyo yokumelana nemichiza. Kuhlala kuvumelana.

Iindlela zokungaphumeleli Ufunda kuphela ngokubona

Ngaphandle kokuhamba, umbulali omkhulu kukuthotywa kwe-thermal. Ukuvezwa ixesha elide kwinqanaba eliphezulu lobushushu kubangela ukuba i-PTFE ibe brittle. Ayinyibiliki; iqala ukuqhekeka, ngakumbi ngexesha lokuvalwa xa izinto zipholile. Uya kufumana i-gasket iqhekezwe ibe ziziqwenga xa uvula i-flange.

Enye inqaku elifihlakeleyo kukugqitywa komphezulu we-flange. Kwiinkonzo zobushushu obuphezulu, isiphelo serrated singabalulwa ukuze silume ngcono. Kodwa ngemathiriyeli ethambileyo efana ne-PTFE, ezo serrations zinokusika kwi-gasket ekuhambeni kwexesha, ngakumbi ngexesha lokwandiswa kwe-thermal/contraction cycle. Ndiye ndatshintshela kwi-spiral-wound gasket kunye ne-PTFE filler kwiimeko ezinjalo, apho i-metal windings ithatha i-mechanical bite, kwaye i-PTFE ibonelela ngesitywina. Kungcono kakhulu ukuqina.

Uxinzelelo sesinye isiqingatha senxaki. Ubushushu obuphezulu, umgca woxinzelelo oluphantsi unokuvumela i-PTFE gasket kwiminyaka edlulileyo. Ubushushu obufanayo obunoxinzelelo oluphezulu lwangaphakathi, ngakumbi ukuba luhamba ngebhayisekile, luya kubufutshane kakhulu ubomi bayo. Umthwalo ebusweni be-gasket uhlala utshintsha, usebenza izinto eziphathekayo.

Ukukhetha okuSebenzayo kunye neMigibe yoFakelo

Ubukhulu be-gasket bubaluleke ngaphezu kokuba abantu becinga. Kwii -apps zobushushu obuphezulu, ndihlala ndincinci. I-gasket eyi-1.5mm inemathiriyeli encinci yokurhubuluza kunye nokuphazamisa kune-3mm enye. Kukwafuna umthwalo ophezulu webholithi ukutywinwa kwasekuqaleni, okukhokelela kwinto ebalulekileyo elandelayo: inkqubo yokubholitha.

Ukuba awufumani umthwalo webholt kwasekuqaleni, libala malunga nexesha elide iqondo lobushushu eliphezulu ukusebenza. I-Under-torquing, kunye netywina lokuqala lihlwempuzekile. Ukubetha ngaphezulu, kwaye uyicinezele i-PTFE ngaphaya kokuchacha, ukukhawulezisa ukuhamba. Ukusebenzisa i-wrench ye-torque elinganisiweyo kunye nolandelelwano olufanelekileyo lokuqinisa i-cross-pattern ayisiyonto nje yokwenza okulungileyo; ngumahluko phakathi kwegasket ehlala unyaka omnye okanye emithathu.

Oku sikufunde kabuhlungu kwibhanki ethengisa ubushushu. Iqela lolondolozo lisebenzise izitshixo zempembelelo kwisantya. Iigaskets (uhlobo lwe-PTFE oluqiniweyo) ziqhume kwiiveki nje zokufikelela kubushushu bokusebenza. Umthwalo ongalinganiyo, ogqithisileyo wenze iindawo zoxinzelelo zasekuhlaleni ezathi ubushushu buphelile.

Umele Uyisebenzise nini kunye nexesha lokuhamba

Ke, iphi i-gasket ephezulu ye-PTFE yenza ingqiqo? Kwinkonzo eqhubekayo, ndiza kuqaphela ngaphezu kwe-200 ° C ngaphandle kokuba ibakala elizaliswe kwaye uxinzelelo luphantsi. Indawo yayo emnandi ikwinkonzo edlekayo apho ubushushu buphakathi kodwa iikhemikhali zilawula iielastomer ezininzi. Ngokomzekelo, imijelo ye-asidi eshushu kwi-150-180 ° C.

Kubushushu bokwenyani obuphezulu, i-high-pressure flanges, njengakwimveliso yamandla, ujonge igraphite, i-spiral-nxeba, okanye i-ring-type joints. I-PTFE ayingomdlali apho. Ndiyibonile i-specs evela kwiifemu zobunjineli ezibiza ngokungaboniyo kwi-PTFE yokumelana nokubola kumgca we-280 ° C, kwaye iresiphi yokuvalwa. Kufuneka utyhale umva kunye nemida yezinto eziphathekayo.

Ngamanye amaxesha, isisombululo sibekwe. Iprojekthi endisebenze kuyo kunye nomthengisi onje I-Sunnian Zitai Festener Fishaner Comment Com. (bahlala eYongnian, ihabhu enkulu yokuqinisa eHebei, unokubafumana I-Zitafasteners.com) ayibandakanyi nje i-gasket kodwa yonke inkqubo yokubolisa. Sasifuna iibholiti zamandla aphezulu ezinokugcina umthwalo kwiqondo lokushisa ukugcina i-PTFE gasket isebenza. Yinkqubo, hayi icandelo elizimeleyo.

Umbono weXesha elide kunye nezinye iindlela

Ukuqina ekugqibeleni malunga neendleko zizonke. Igasket ye-PTFE enexabiso eliphantsi engaphumeleliyo kwiinyanga ezi-6 ixabisa ngaphezulu kokusebenza kunye nexesha lokuphumla kunegasket ebiza kakhulu ye-spiral-wound ehlala iminyaka emi-5. Kufuneka uqikelele kwishedyuli yokugcina kunye nokubaluleka komgca.

Ukutshintshwa kwiiflange ezikhoyo, soloko ulinganisa isithuba kwiqondo lokushisa lokusebenza ukuba unako. Iiflange ezindala zijika. I-gasket oyifakayo ebandayo kufuneka itywine ishushu, kwijometri egqwethekileyo. Ngamanye amaxesha, olona khetho lomelele kukulungisa i-flange kuqala.

Ekugqibeleni, ukuphendula kukunyanzela ukuba ubuze imibuzo elishumi elinambini. Yeyiphi iprofayile yobushushu obuchanekileyo? Yintoni i medium? Ithini imeko yeflange kunye nokubopha? Akukho mpendulo enye, iseti nje yokurhweba ngokusekelwe kumava-kwaye ngamanye amaxesha, kwiintsilelo ezidlulileyo. Injongo ayingonaphakade; yeyokuxelwa kwangaphambili, isithuba senkonzo esithembekileyo onokuthi uyicwangcise ngokusingqongileyo. Kwaye ngenxa yoko, ukuqonda imida yehlabathi lokwenyani yeyona nto isebenzayo.