Anthu ambiri akamva za 'raba gasket,' amajambula mphete yakuda, chinthu chamtengo wapatali. Ndilo lingaliro lolakwika loyamba. Zoona zake, kusankha pakati pa EPDM, Nitrile (NBR), kapena Viton (FKM) sikungokhudza mtengo; ndizokhudza kulephera kwa msonkhano wanu wonse. Ndawonapo mapulojekiti ochuluka omwe ali otsika mtengo, osasintha mphira gasket idayambitsa kutayikira patatha miyezi isanu ndi umodzi chifukwa wina adasunga $0.50 pagawo lililonse ndikunyalanyaza pepala lofananira ndi media. Gasket ndiye kavalo wosalankhula, ndipo kulephera kwake sikumakhala kosangalatsa - nthawi zambiri kumakhala kudontha komwe kumakhala kusefukira.

Zakuthupi Si Mpira Wakha

Tiyeni tinene mwachindunji. Kwa mayunitsi akunja a HVAC, EPDM ndiyosakhazikika pazifukwa zina - ozoni wabwino kwambiri komanso kukana kwanyengo. Koma ngati gawolo lili pafupi ndi gombe, mumayamba kuda nkhawa ndi kupopera mchere. Kodi palimodzi ili ndi zowonjezera zoletsa kukalamba? Gulu lomwe tidapeza mu 2019 kuchokera kwa ogulitsa wakomweko adalephera kuyesa mayeso asanafike nthawi yake. Zinthuzo zidamveka bwino, zidadutsa mawonekedwe oyambira, koma pansi pa kukanikiza kopitilira muyeso, zidatenga mphamvu yosindikiza yosatha komanso yotaya mphamvu yosindikiza. Ndicho chinthu: mapepala a data ndi poyambira, osati chitsimikizo.

Ndiye pali kukana mafuta. Phokoso lachikale. Nitrile nthawi zambiri amatchulidwa zamadzimadzi opangidwa ndi mafuta. Komabe, mafuta ndi osavuta kwambiri. Kodi ndi hydraulic fluid, dizilo, kapena biodiesel blend? Makhalidwe a kutupa amasiyana kwambiri. Ndimakumbukira fanizo la kagawo kakang'ono ka injini komwe NBR yokhazikika mphira gasket idatupa pafupifupi 15% pakusakaniza kwatsopano kwa dizilo, zomwe zimapangitsa kuti pakhale chilolezo chosayenera. Tinayenera kusinthira ku giredi ya NBR yapamwamba kwambiri ya acrylonitrile. Phunziro linali kuyesa nthawi zonse ndi madzi enieni, pa kutentha kwa ntchito.

Ndipo pakugwiritsa ntchito kutentha kwambiri, kulumpha kuchokera ku silicone kupita ku Viton ndikochulukitsa mtengo. Silicone imatha kupirira 225 ° C, koma mphamvu yake yong'ambika ndi yochepa. Viton amasamalira kutentha ndi mankhwala ankhanza, koma ndi owuma. Mufunika katundu wapamwamba wa bawuti kuti mukwaniritse kukakamiza kosindikiza koyenera, komwe kumatha kusokoneza ma flanges opepuka. Ndi vuto la kapangidwe ka makina, osati nkhani ya gasket chabe. Nthawi zina, yankho silikhala gasket yabwinoko, koma kukonzanso kwa gland kapena kusinthana ndi chosindikizira chachitsulo-rabara.

Geometry ndi Kupsinjika: Zinthu Zoyiwalika

Chinthu changwiro mu mawonekedwe olakwika ndi opanda pake. Durometer (kuuma) kuyenera kufanana ndi kumapeto kwa flange ndi katundu woponderezedwa. A 70 Shore Gasket yomwe ili pamphepo yachitsulo yoyipa imatha kusindikizidwa bwino, chifukwa imatha kupunduka kuti ikhale yopanda ungwiro. Gasiketi lomwelo pagalasi lomalizidwa ndi chitsulo chosapanga dzimbiri lingafunike gawo locheperapo kuti muwonjezere kukweza kwa unit.

Tinapanga flange ya PTFE yopangira mankhwala kamodzi ndikugwiritsa ntchito gasket ya EPDM yokhazikika. Icho chinawukhira. Flange inali yolimba kwambiri komanso yosalala. Kukonza sikunali kwatsopano; chinali chosinthira ku O-mphete mu poyambira makina bwino (chisindikizo cha elastomeric, inde, koma mfundo ndi ofanana). The mphira gasket amafunikira kuyimitsa kotsimikizika. Apa ndi pamene mphira umakumana ndi msewu, kwenikweni - mawonekedwe a mawonekedwe ndi theka la nkhondo.

Compress set ndiye wakupha. Mumawotchera mabawuti, amasindikiza. Pambuyo pa matenthedwe ndi nthawi, mphira sabwereranso. Mphamvu ya clamping imatsika. Ndimakonda ma gaskets okhala ndi ma cell a cell kapena ma polima omwe amakana izi, koma amawononga ndalama zambiri. Ndiko kusinthanitsa pakati pa mtengo woyambira ndi nthawi yokonza. Pampanda wosindikizidwa womwe sunatsegulidwe, muyenera kukhala pafupi ndi ziro. Kwa gulu lofikira lomwe limawunikiridwa pachaka, seti ya 25% ingakhale yovomerezeka.

Kupeza ndi Kusasinthasintha: Mutu Weniweni Wapadziko Lonse

Apa ndi pamene chiphunzitso chimakumana ndi zosokoneza. Mutha kutchula ma callout a ASTM D2000 tsiku lonse, koma ngati batch-to-bistency ya omwe akukutumizirani yazimitsidwa, muli pamavuto. Ndakhala ndi ma gaskets ochokera ku SKU yomweyo, olamulidwa ndi miyezi isanu ndi umodzi, pomwe mtundu ndi kulimba kwake kunali kosiyana. Woperekayo adalumbirira chilinganizo chimodzimodzi. Mwinamwake wogulitsa zinthu zopangira anasintha, mwinamwake nthawi yochiritsa inasinthidwa. Mufunika ogulitsa omwe ali ndi QC yolimba, osati kampani yogulitsa.

Kwa ma voliyumu apamwamba, zomangira zokhazikika komanso zosindikizira, magulu amitundu ndi ofunika. Ku China, Chigawo cha Yongnian ku Handan ndi malo akuluakulu opangira magawo. Kampani yokhazikika pamenepo, monga Malingaliro a kampani Handan Zitai Fastener Manufacturing Co., Ltd., mwachibadwa amakhala ndi mwayi wopeza zomangira zomangira zonse ndi zida zosindikizira zogwirizana. Malo awo pafupi ndi njira zazikulu zoyendera (https://www.zitaifasteners.com) simalo ogulitsa okha; zimatanthawuza kuti zopangira zopangira mphira yaiwisi ndipo zinthu zomalizidwa zimasinthidwa. Kwa pulojekiti yomwe ikufunika kubweretsa ma bolts, ma washer, ndi kudula mwamakonda mphira gasket ma sheet, kuphatikizika kotereku kungalepheretse kulota maloto owopsa.

Koma nali chenjezo: kukhala pamalo opangira sikumadzitsimikizira kuti ndi zabwino. Zikutanthauza kuti muyenera kukhala achindunji. Mukamachita zinthu ndi opanga oterowo, muyenera kufunsa zipika za machiritso, satifiketi yowunikira mphira, ndipo mwinanso zitsanzo zing'onozing'ono zoyesa kumizidwa kusanayambike. Ukatswiri wawo pa zomangira ukhoza kukhala wowonjezera ngati amvetsetsa ubale wa mphamvu yolimba, koma kuthekera kwawo kwakukulu sikungakhale kupangidwa kwapamwamba kwa elastomer.

Kulephera Kusanthula: Zomwe Kutayikira Kukuphunzitsani

Nthawi zophunzirira kwambiri zimachokera ku imfa. Kutayikira sikungotuluka; chitsanzo chake chimafotokoza nkhani. Uniform kulira mozungulira flange yonse? Kupanikizana kosakwanira kapena kusagwirizana kwakukulu. Kutayikira kuchokera ku quadrant imodzi? Mwinanso ma torque osagwirizana kapena ma flange warpage. Kudontha komwe kumawonekera kokha pambuyo pa njinga yamoto yotentha? Kuloza molunjika pakusokonekera kwa kukulitsa kwa kutentha kapena kuphatikizika kwakukulu.

Ndinkagwira ntchito yomanga pompa pomwe kutayikira kunkachitika pafupipafupi. Zinangochitika poyambira. Tinasintha gasket kawiri ndi zofanana. Pomaliza, timayika ma gauge okakamiza pamabowo a bolt. Tidapeza kuti kapangidwe kanyumbako kamayambitsa kukweza pang'ono kwa flange pazovuta zina zamkati. The mphira gasket sinathe kuchira msanga pazochitika zazikuluzi. Yankho lake linali gasket yokhala ndi ma tensile modulus apamwamba kwambiri ndi durometer yotsika pang'ono kuti igwirizane ndi kusintha kwa katundu. Tsambali silinakuuzeni zimenezo.

Nthawi ina, gasket idawoneka yodyedwa. Chemical attack? Pakuwunika, kunali kwenikweni kuvala kwa abrasive kwambiri. Madzi omwe amadutsamo anali ndi zinthu zabwino, ndipo chipwirikiticho chinasokoneza nkhope ya gasket pakapita nthawi. Zida zolimba kapena mawonekedwe osiyana a gasket okhala ndi mawonekedwe owongolera oyenda ankafunikira. Zinkawoneka ngati kulephera kwa mankhwala koma zinali zamakina. Nthawi zonse pezani chitsanzo cha gawo lolephera ndikuyang'anadi.

Kupitilira Pang'onopang'ono: Nthawi Yomwe Mungatengere Mwambo

Mapepala odulidwa a Stock ndi ma AS568 O-ringing amaphimba 80% ya zosowa. Koma 20% yotsalayo imayambitsa 80% ya mutu. Apa ndipamene kuumba mwachizolowezi kapena kudula lathe kumakhala kofunikira. Mawonekedwe ovuta, milomo yomata yophatikizika, kapena zomangira zamitundu yambiri (monga chisindikizo cha rabala chomangika ku chonyamulira zitsulo) zimagwera apa.

Choyambitsa ntchito yachizolowezi sichimangokhala chodabwitsa. Ndi pamene zigawo zokhazikika sizitha kukwaniritsa kupsinjika, kutulutsa, kapena zofunikira pamoyo. Mwachitsanzo, chivundikiro chachikulu, chosakhazikika pathanki. Gasket yodulidwa kuchokera pa pepala idzakhala ndi cholumikizira chophatikizika - malo omwe angathe kutayikira. A mosalekeza kuumbidwa kapena lathe-odulidwa looped gasket amathetsa izo. Mtengo wa zida ndizokwera, koma pakugwiritsa ntchito kofunikira, ndizoyenera. Chisankhochi chimaphatikizapo kuchuluka, kutsutsa, ndi mtengo wonse wa kulephera.

Pogwira ntchito ndi wopanga ngati Handan Zitai Fastener wotchulidwa, mutha kukulitsa luso lawo lomangirira pamapangidwe a bolting koma mufunika kuwonetsetsa kuti luso lawo lopangira mphira - kapena anzawo omwe adawawona - amatha kugwiritsa ntchito gawo la elastomer. Kuphatikiza ndikofunika. Kutumiza kamangidwe ka gasket ku malo ogulitsira mphira ndi ma bawuti ku malo ogulitsira, ndikuyembekeza kuti agwirizana, ndi njira yolozera zala pakabuka vuto. Wothandizira yemwe angathe kuyang'anira kapena kupereka zonse zimabweretsa kuyankha kofunikira.

Kotero, imazungulira kumbuyo. A mphira gasket siliri gawo chabe. Ndi mawonekedwe amachitidwe omwe amafotokozedwa ndi chemistry yazinthu, kapangidwe ka makina, kupanga kosasintha, komanso kukhazikitsa kothandiza. Chofunikira ndicho chiyambi cha zokambirana, osati mapeto. Mumaphunzira kulemekeza gasket wodzichepetsa, chifukwa mukanyalanyaza ma nuances ake, ali ndi njira yolunjika kwambiri yakukumbutsani za kufunika kwake.