High temp PTFE gasket durability? 

Tikhale enieni, wina akafunsa za kulimba kwa gasket kwa PTFE, nthawi zambiri akuwonetsa chisindikizo chamatsenga chomwe chimagwira 500 ° F kwamuyaya. Ndilo gawo loyamba lomwe timakhumudwitsidwa. PTFE ndiyabwino, koma kutentha kwakukulu ndikofanana, ndipo kulimba kumatengera zomwe mukufunsa kuti muchite. Kodi ndikukwera njinga mosalekeza? Kodi pali kukhudzana ndi mankhwala pamwamba pa kutentha? Kapena ndi malo osasunthika, otentha? Yankho limasintha chirichonse.

Malingaliro Olakwika a High Temp ndi Zowona Zakuthupi

PTFE yoyera imayamba kukwawa kwambiri pamwamba pa 400 ° F (kuzungulira 204 ° C). Mutha kupeza zidziwitso zonena kuti zitha kugwiritsidwa ntchito mpaka 500 ° F (260 ° C), ndipo mwaukadaulo, sizisungunuka nthawi yomweyo. Koma pamlingo wapamwambawo, mawonekedwe ake amafewa. Gasket imatha kuzizira, kutanthauza kuti imapindika pang'onopang'ono pansi pa bolt, zomwe zimapangitsa kupumula kwa nkhawa komanso kutayikira. Choncho, kupirira pa 250 ° C ndi funso la nthawi ndi kupanikizika, osati inde / ayi.

Ndikukumbukira pulojekiti yomwe inali pamzere wa mankhwala omwe amatsuka nthunzi pang'onopang'ono. Kutentha kumakwera mpaka 230 ° C kwakanthawi kochepa. Tinagwiritsa ntchito a Mtengo wa PTFE, ndipo zinagwira ntchito… kwa miyezi itatu. Kenako kuchucha kunayambika pamabowo a bawuti. Vuto silinali kutentha kwapamwamba pa sekondi imodzi, koma matenthedwe obwerezabwereza ophatikizana ndi kuzungulira kwa flange panthawi ya bolting. Zinthuzo zinataya mphamvu.

Ichi ndichifukwa chake magiredi odzaza a PTFE amayamba kusewera. Zida monga PTFE yodzazidwa ndi galasi kapena kaboni yodzaza ndi mpweya imathandizira kukana kwambiri. Amatha kunyamula katundu wapamwamba wamakina pa kutentha kokwera, kukulitsa moyo wautumiki. Koma ngakhale zili choncho, mumagulitsa zina mwazomwe zimatsutsana ndi mankhwala a PTFE. Nthawi zonse ndi kutsutsana.

Njira Zolephera Zomwe Mumaphunzira Pongowona

Kupatula apo, chowopsa chachikulu ndikuwonongeka kwamafuta. Kuwonekera kwa nthawi yayitali kumapeto kwa kutentha kumapangitsa kuti PTFE ikhale yovuta. Sichisungunula; imayamba kusweka, makamaka panthawi yotseka zinthu zikazizira. Mudzapeza gasket itasweka mu zidutswa mukatsegula flange.

Mfundo ina yobisika ndi kumaliza kwa flange pamwamba. Pazithandizo zotentha kwambiri, kumaliza kwa serrated kungatchulidwe kuti kuluma bwino. Koma ndi zinthu zofewa ngati PTFE, ma serrations amenewo amatha kudula mu gasket pakapita nthawi, makamaka panthawi yokulitsa / kutsika kwamafuta. Ndasinthira ku spiral-bala gasket yokhala ndi PTFE filler pazifukwa zotere, pomwe mawotchi achitsulo amalumidwa ndi makina, ndipo PTFE imapereka chisindikizo. Zabwino kwambiri kukhazikika.

Kupanikizika ndi theka lina la equation. Mzere wotentha kwambiri, wotsika kwambiri ukhoza kuloleza PTFE gasket zaka zatha. Kutentha komweko komwe kumakhala ndi kuthamanga kwambiri kwamkati, makamaka ngati kuli kozungulira, kumafupikitsa moyo wake. Katundu pa nkhope ya gasket amasintha nthawi zonse, akugwira ntchito zakuthupi.

Zovuta Zosankha ndi Kuyika

Makulidwe a gasket amafunikira kwambiri kuposa momwe anthu amaganizira. Kwa mapulogalamu apamwamba kwambiri, ndimakonda kukhala woonda kwambiri. Gasket ya 1.5mm ili ndi zinthu zochepa zokwawa ndikupotoza kuposa 3mm imodzi. Pamafunikanso kuchuluka kwa bawuti kuti asindikize koyambirira, zomwe zimatsogolera ku chinthu chotsatira chofunikira: njira yoboola.

Ngati simukupeza bolt kuyambira pachiyambi, iwalani za nthawi yayitali kutentha kwambiri ntchito. Kusagwedezeka kwamphamvu, ndipo chisindikizo choyamba ndi chosauka. Kuwongolera mopitilira muyeso, ndipo mwakakamiza PTFE kupitilira kuchira, ndikufulumizitsa kukwapula. Kugwiritsira ntchito wrench ya torque yolinganizidwa ndi ndondomeko yoyenera yomangirira sikumangochita bwino; ndi kusiyana kwa gasket yomwe imakhala chaka chimodzi kapena zitatu.

Tinaphunzira izi movutikira kwambiri pa banki ya zida zosinthira kutentha. Gulu lokonza limagwiritsa ntchito ma wrench kuti lifulumire. Ma gaskets (mtundu wolimbikitsidwa wa PTFE) adaphulika mkati mwa milungu ingapo kuti afike kutentha kwa ntchito. Kulemera kosafanana, kuchulukirachulukira kudapangitsa kuti pakhale nkhawa zomwe zimatha kutentha.

Nthawi Yogwiritsa Ntchito ndi Nthawi Yoyenera Kuchokapo

Ndiye, kodi kutentha kwapamwamba kwa PTFE kumamveka kuti? Kuti mutumikire mosalekeza, ndingakhale wosamala pamwamba pa 200 ° C pokhapokha ngati ili kalasi yodzaza ndipo kupanikizika kuli kochepa. Malo ake okoma ali mu ntchito yowononga pomwe kutentha kumakhala kocheperako koma mankhwala amaletsa ma elastomer ambiri. Mwachitsanzo, kutentha kwa asidi pa 150-180 ° C.

Kwa kutentha kwenikweni, ma flanges othamanga kwambiri, monga mukupanga mphamvu, mukuyang'ana ma graphite, mabala ozungulira, kapena ophatikizana amtundu wa mphete. PTFE siwosewera pamenepo. Ndawonapo zolemba kuchokera kumakampani opanga uinjiniya omwe amayitanitsa PTFE mwachimbulimbuli kuti athane ndi dzimbiri pamzere wa 280 ° C, ndipo ndi njira yotseka. Muyenera kukankhira mmbuyo ndi malire azinthu.

Nthawi zina, yankho ndi wosanjikiza. Pulojekiti yomwe ndidagwirapo ndi wothandizira ngati Malingaliro a kampani Handan Zitai Fastener Manufacturing Co., Ltd. (amakhala ku Yongnian, malo ojambulira kwambiri ku Hebei, mutha kuwapeza zitaifsteners.com) sanaphatikizepo gasket yokha komanso makina onse a bolting. Tinkafunika ma bolts amphamvu kwambiri omwe amatha kusunga katundu pa kutentha kuti PTFE gasket igwire ntchito. Ndi dongosolo, osati gawo lapadera.

Kuwona Kwanthawi Yaitali ndi Njira Zina

Kukhalitsa kumatengera mtengo wathunthu. Gasket yotsika mtengo ya PTFE yomwe imalephera m'miyezi 6 imawononga ndalama zambiri pakubala komanso nthawi yopumira kuposa mafuta okwera mtengo kwambiri omwe amatha zaka zisanu. Muyenera kuganizira za ndandanda yokonza komanso kufunikira kwa mzerewu.

Zosintha m'ma flange omwe alipo, nthawi zonse yesani kusiyana kwa kutentha kwa ntchito ngati mungathe. Mitundu yakale ya flanges. Gasket yomwe mumayika ozizira iyenera kusindikiza kutentha, mu geometry yolakwika. Nthawi zina, njira yolimba kwambiri ndiyo kukonza flange poyamba.

Pomaliza, kuyankha kumakukakamizani kufunsa mafunso ena khumi ndi awiri. Kodi kutentha kwake ndi kotani? medium ndi chiyani? Kodi flange ndi bolting ndi chiyani? Palibe yankho limodzi, kungosinthana kwa malonda malinga ndi zomwe zachitika-ndipo nthawi zina, pazolephera zakale. Cholinga sichikhala nthawi zonse; ndi ya nthawi yodziwikiratu, yodalirika yautumiki yomwe mutha kukonzekera mozungulira. Ndipo chifukwa cha izi, kumvetsetsa malire azinthu zenizeni ndi chinthu chokha chomwe chimagwira ntchito.