Yintoni i-Elastomer Bellow Mechanical Seal?

Yintoni i-Elastomer Bellow Mechanical Seal

I-elastomer ivakala ngathi yi-elastomerisitywino soomatshinisisixhobo sokuvala esikhethekileyo kakhulu esenzelweizixhobo ezijikelezayo, ikakhulu iimpompo ze-centrifugal, ii-mixers, kunye nee-agitators. Ngokungafaniyo nezitywino zendabuko ezisebenzisa ii-O-rings ezitshintshayo okanye ii-V-rings ezityibilikayo ecaleni kwe-shaft, olu yilo lusebenzisa ityhubhu ye-elastomeric edibeneyo—engaphantsi—ukuvala umsantsa phakathi kwe-shaft ejikelezayo kunye nobuso bokutywina obuphambili. Olu lwakhiwo lususa ngokwemvelo imfuneko yetywino yesibini etyibilikayo, ngaloo ndlela inciphisa ukuxinana kwe-shaft kunye nokusilela kokugcinwa okunxulumene noko.

Iiseal ezisezantsi ze-elastomer ezisezantsi zihlala zenziwe ngeedayamitha zeshaft eziqala kwi-10 mm ukuya kwi-100 mm, nangona kukho ubukhulu obukhethekileyo kwizixhobo ezikhethekileyo zoshishino. Ngokudibanisa umsebenzi wesibini wokutywina, ukudluliselwa kwe-rotational drive, kunye nokuguquguquka kwe-axial kwinxalenye enye yepolymeric, iinjineli zinokufikelela kwindlela yokutywina eqinileyo, encinci, nesebenza kakuhle efanelekileyo kuluhlu olubanzi lweenkqubo zokuphatha ulwelo oluphantsi ukuya koluphakathi.

Izinto eziphambili kunye nomgaqo wokusebenza

Uyilo lwe-elastomer bellow mechanical seal lugxile kwizinto ezine eziphambili: iringi ejikelezayo, iringi yokudibana engashukumiyo, iringi yokuhlangana ye-elastomer ngokwayo, kunye nendlela yokwenziwa kwentwasahlobo yomatshini. Iiringi zokuqala kunye nezokudibana zenza ujongano oluphambili lokutywina, oludityaniswe lube luhlaza okwesibhakabhaka oluhlala lulinganiswa kwiibhendi zokukhanya ze-helium ukuqinisekisa ukuhambelana kwe-microscopic. Ezi buso zahlulwe kuphela yifilimu yolwelo lwe-hydrodynamic eveliswa yi-pumped medium.

Intwasahlobo yoomatshini—edla ngokuba yintwasahlobo enye, eqinileyo yekhoyili—ibekwe ngasemva kobuso bokuqala. Inika amandla okuvala afunekayo ukugcina unxibelelwano lobuso ngexesha lokuqalisa kwezixhobo, ukuvala, kunye namaxesha oxinzelelo oluphantsi lwenkqubo. Ngenxa yokuba intwasahlobo idla ngokugcinwa ngaphandle kulwelo olupompelweyo okanye ikhuselwe yintsimbi engaphantsi, ayichaphazeleki lula kukuxinana okanye ukubola xa ithelekiswa nemithombo emininzi emincinci efumaneka kwezinye iidizayini ze-pusher seal.

Indlela engaphantsi ebonelela ngayo ukutywinwa kwesibini kunye nokuguquguquka

Uphawu olucacileyo lolu hlobo lwesitywino kukusebenza kabini kwe-bellow. Kwi-interface ye-shaft, isiphelo somva se-elastomer bellow sine-interference fit. Le tight static grip isebenza njengesitywino sesibini nxamnye ne-shaft, ithintela ukudlula kolwelo ngelixa ngaxeshanye idlulisela i-rotational torque kubuso bokuqala bokutywina ngaphandle kwesidingo sezikrufu okanye ii-drive pin.

Ngokwe-axial, ii-convolutions ze-bellow zibonelela ngokuguquguquka okubalulekileyo. Njengoko ubuso be-primary seal buguguleka ngokungenakuphepheka kwiiyure ezininzi zokusebenza, i-bellow iyanwebeka ukuze igcine unxibelelwano. I-standard elastomer bellow inokuhlawula ukuya kuthi ga kwi-2.0 mm yokudlala okanye ukuguguleka kobuso. Ngaphezu koko, olu kuguquguquka lufunxa ukungalungelelani kwe-angular kunye nokubaleka kwe-shaft, kuqinisekisa ukuba ubuso bokuqala buhlala buhambelana kwaye ifilimu ye-hydrodynamic ihlala izinzile phantsi kweemeko zokusebenza ezinamandla.

Kutheni i-Elastomer Bellow Mechanical Seals ibalulekile

Ukubaluleka kwemizi-mveliso kwezitywini ze-elastomer bellow mechanical kuvela kubuchule bazo obukhethekileyo bokusombulula imiba yokuthembeka okungapheliyo efumaneka kuyilo lwe-O-ring oluguquguqukayo. Kwiindawo zokuphatha ulwelo, ukuthembeka kwezixhobo ezijikelezayo kuhambelana ngqo nokuthembeka kwezitywini ze-shaft yazo. Izitywini ze-Elastomer zijongana nezizathu eziphambili zokusilela kwesitywini ngaphambi kwexesha, ziguqulela ngokuthe ngqo kwixesha elide lokusebenza kunye neendleko zokulungisa ezincitshisiweyo.

Ngenxa yokuba ezi zitywini ziqhuba ubuso obujikelezayo ngokusebenzisa ukungqubana okungaguqukiyo kwe-bellow kwi-shaft, ziyayisusa into yokuxinana kwe-shaft. Ukuxinana kwenzeka xa i-O-ring enamandla iqhubeka ityibilika ibuyela umva nangaphambili ecaleni kwe-shaft ngenxa yokungcangcazela okanye ukuguguleka kobuso, ekugqibeleni igqume i-shaft okanye i-sleeve. Ngokususa le ndlela yokusilela, izixhobo ziphepha inkqubo ebiza kakhulu nethatha ixesha yokutshintsha okanye ukulungisa ii-shaft zepompo.

Indlela ezichaphazela ngayo ulawulo lokuvuza

Ulawulo lokuvuza kwiitywina zoomatshini luxhomekeke ekugcineni unxibelelwano olungenakuphazamiseka phakathi kobuso bokuqala. Iitywina zemveli zokutyhala zidla ngokuba "zixhonywe," imeko apho i-O-ring enamandla inamathela kwi-shaft ngenxa yokwakheka kwenkunkuma, ukwakheka kwesikali, okanye ukuxinana kwendawo. Xa kuxhonywa, intwasahlobo yangaphakathi ayinakutyhala ubuso bokuqala phambili ukuze ihlawulele ukuguguleka, nto leyo ebangela ukuvuza okubi kakhulu.

Iiseal ze-Elastomer bellow azikwazi ukuxhonywa kuba iseal yesibini ayitshintshi xa ithelekiswa ne-shaft. Isenzo sokugoba se-bellow sihlala sivumela ukuguguleka kobuso kunye nokuhamba kwe-shaft ngaphandle kokufuna ukuba naliphi na icandelo lityibilike. Kwiinkqubo ezilungelelaniswe kakuhle ezisebenza ngaphakathi kweeparamitha ezichaziweyo, olu yilo lugcina ngokuthembekileyo amazinga okukhupha ukungcola kunye nokuvuza angaphantsi kwe-0.1 mL/iyure, ukuqinisekisa ukuthotyelwa kwemigaqo engqongqo yokusingqongileyo kunye nokhuseleko.

Izicelo eziqhelekileyo kunye namatyala okusetyenziswa

Ezi zitywini zifumaneka kakhulu kumashishini afuna ukuthembeka okuphezulu phantsi kwemilinganiselo yokusebenza ephakathi. Ziyindlela eqhelekileyo yokukhethaunyango lwamanzi amdaka kamasipala, iimpompo zokujikeleza kwegazi ze-HVAC, iinkqubo zokucoca idama lokudada kunye ne-spa, kunye nokulungiswa kokutya neziselo apho kufuneka ukuhambelana okuphakathi kweekhemikhali. Ukuqina kwazo kuzenza zilungele ngokukodwa ulwelo olungelulo ulwelo lweNewtonian okanye imidiya equlethe izinto ezincinci.

Ngenxa yokuba akukho sitywino sesibini esityibilikayo esinokuvaleka, izitywino ze-elastomer bellow zinokuphatha ngokufanelekileyo ulwelo olunezinyibilikisi ezixhonyiweyo ukuya kuthi ga kwi-10% ngobunzima, ukuba ubuso besitywino sokuqala benziwe ngezinto eziqinileyo ezifana neSilicon Carbide okanye iTungsten Carbide. Olu buchule bokuphatha inkunkuma bubenza babaluleke kakhulu kwiimpompo zokungenisa amanzi aluhlaza kunye neenkqubo zokunkcenkceshela kwezolimo apho ubumsulwa bolwelo bungenakuqinisekiswa.

Indlela i-Elastomer Bellow Mechanical Seals ezithelekiswa ngayo nezinye izitywina

Ukucacisa isitywino esichanekileyo soomatshini kufuna ukuqonda urhwebo olusebenzayo phakathi kobuchwepheshe obahlukeneyo bokutywina. Izitywino ze-elastomer ezithambileyo zithatha indawo ephakathi eyahlukileyo nexabisekileyo phakathi kwezitywino ze-pusher ezingabizi kakhulu nezinokulungiswa okuphezulu kunye nezitywino zesinyithi ezithambileyo ezibiza kakhulu nezinomthwalo omkhulu.

Nangona zibonelela ngeenzuzo ezibalulekileyo kune-O-ring pusher seals eqhelekileyo ngokubhekiselele ekuthembekeni nasekugcinweni kweshaft, zithintelwe yimida ebonakalayo yezinto ze-elastomeric ezakhiwe ngazo. Ukuvavanya olu mahluko kubalulekile kwiinjineli ezinikwe umsebenzi wokuphucula ukuthembeka kwezityalo kunye nokulawula uhlahlo lwabiwo-mali lokuthenga.

Umahluko ophambili ekusebenzeni

Umahluko ophambili phakathi kweentlobo zesitywina uxhomekeke kwindlela ezisabela ngayo kwi-shaft dynamics kunye neemeko zenkqubo ezigqithisileyo. Izitywina zokutyhala azibizi kakhulu kodwa zisengozini yokuxhonywa kunye nokutsalwa. Izitywina zesinyithi ezifakwe emphethweni, ezakhiwe ngee-alloys ezifana neHastelloy okanye i-Inconel, ziyasusa ukutsalwa kwaye zinokumelana namaqondo obushushu agqithisileyo (adla ngokudlula i-400°C), kodwa zinexabiso lenkunzi elinokuba ngaphezulu ngokuphindwe kalishumi ukuya kumashumi amabini kunezinye iindlela ze-elastomeric.

Njengoko kubonisiwe kwi-matrix yokuthelekisa, ii-elastomer bellow seals zibonelela ngeenzuzo zokusebenza koyilo olungenangxaki ngaphandle kweendleko ezinkulu zemali yentsimbi, nto leyo eyenza ukuba zibe lolona khetho lufanelekileyo kwizicelo ezininzi zokudlulisa ulwelo oluqhelekileyo.

Uxinzelelo, ubushushu, kunye nokuhambelana kweekhemikhali

I-envelope yokusebenza ye-elastomer bellow seal ilawulwa ngokungqongqo yi-polymer composition ye-bellow. I-Nitrile Rubber (NBR) isemgangathweni wamanzi kunye neeoyile ezithambileyo, inikezela ngobushushu obuphezulu bokusebenza obuqhubekayo obumalunga ne-90°C. I-Ethylene Propylene Diene Monomer (EPDM) yandisa lo mda ukuya kwi-120°C kwaye inika ukumelana okuhle namanzi ashushu, umphunga, kunye ne-alkalis ezithambileyo, nangona yonakala ngokukhawuleza xa kukho ulwelo olusekelwe kwi-petroleum.

Kwiikhemikhali ezirhabaxa ngakumbi okanye amaqondo obushushu aphezulu, kusetyenziswa ii-elastomers zeFluorocarbon (FKM/Viton), zityhala umda wobushushu ukuya kuthi ga kwi-200°C. Imida yoxinzelelo ibaluleke ngokulinganayo; kuba i-elastomer bellow yipolymer eguquguqukayo, isengozini yokunyuka okanye ukuphuma phantsi koxinzelelo oluphezulu lwenkqubo. Ngenxa yoko, uninzi lwe-elastomer bellow seals ezingaxhaswayo zilinganiswa ngoxinzelelo oluphezulu lokusebenza phakathi kwe-12 kunye ne-16 bar (1.2 ukuya kwi-1.6 MPa). Ukudlula le mida kufuna ukutshintshela kuyilo lwe-balanced seal okanye i-metal bellow.

Ukukhetha, Ukufakela, kunye Nezinto Zokusebenza

Ukuphunyezwa ngempumelelo kwe-elastomer bellow mechanical seal kuxhomekeke kakhulu kwiindlela zokukhetha ezingqongqo kunye nemigangatho yokufakela eqinileyo. Kwane-seal eyenziwe ngobuchule iya kusilela ngaphambi kwexesha ukuba iiparameter zolwelo lwenkqubo zidlula iinkcukacha zezinto, okanye ukuba iindlela ezilungileyo zoomatshini azinakwa ngexesha lokuhlanganiswa.

Iinjineli kunyeiingcali zolondolozokufuneka bajonge ukutshintshwa kwesitywina njengenkqubo elawulwa kakhulu, bevavanya imida ye-thermodynamic kwaye baqinisekise ukuba i-pump housing kunye ne-shaft ziyahlangabezana nokunyamezelana okungqongqo kobukhulu kunye nokugqitywa komphezulu.

Indlela yokuvavanya ulwelo, ubushushu kunye noxinzelelo

Ukuvavanya iiparameter zenkqubo kufuna ukubalwa kwe-PV (Pressure-Velocity), emele ubushushu bokungqubana obuveliswa kwiindawo zokutywina. Kwisitywina esisezantsi se-elastomer sisebenzisa i-Carbon graphite ngokuchasene neendawo ze-Aluminium Oxide (Ceramic), umda wokusebenza uhlala umalunga ne-10 ukuya kwi-15 MPa·m/s. Ukuba ipompo isebenza ngesantya esiphezulu okanye uxinzelelo oluphezulu oludlula lo mda we-PV, ifilimu yolwelo iya kuba ngumphunga, nto leyo ekhokelela ekusebenzeni okomileyo kunye nokuwohloka kobushushu ngokukhawuleza kwe-elastomer.

Uvavanyo lolwelo kufuneka luqwalasele iimeko zexesha elifutshane. Ulwelo olungenabungozi kuma-20°C lunokuba yingozi kakhulu kwi-elastomer ekhethiweyo kuma-80°C. Ngaphezu koko, ulwelo olunyibilikayo xa lupholile okanye luvezwa emoyeni lunokuqinisa indawo engaphantsi ngexesha lokuvalwa kwepompo, lukrazule i-polymer xa isixhobo siqaliswa kwakhona. Kwimeko ezinjalo, ulawulo lokusingqongileyo lunokufuneka.

Iindlela zokufakela kunye neendlela eziqhelekileyo zokungaphumeleli

Iindlela zokufakela zilawula ngokuthe ngqo ubomi besitywino.umngxuma wepompo kufuneka ungabi namaqhuma, imikrwelo, kunye nemiphetho ebukhali enokusika ububanzi bangaphakathi bezantsi ngexesha lokufakwa. Imigangatho yoshishino iyalela ukugqitywa komphezulu weshaft ngokuqhelekileyo kumgama we-Ra 0.8 ukuya kwi-1.2 µm ukuze kutywinwe kakuhle i-static sealing kunye ne-torque transmission.

Indlela eqhelekileyo yokusilela kukukrazula i-bellow, okubangelwa kukuthambisa okungafanelekanga ngexesha lokuhlanganiswa. Iingcali kufuneka zisebenzise ii-lubricants ezihambelana ne-elastomer ethile; umzekelo, ukufaka i-grease esekelwe kwi-petroleum kwi-EPDM bellow kuya kubangela ukuba irabha idumbe, ithambe, kwaye ekugqibeleni ingasebenzi phantsi kwe-torque ejikelezayo. Ukusetyenziswa kwe-lubricants ze-silicone ezivunyiweyo okanye amanzi anesepha alula kuyimfuneko ukuqinisekisa ukuba izihlalo ze-bellow zilungile ngaphandle kokujika.

Imigangatho, imida, kunye neziqinisekiso zomboneleli

Ukuqinisekisa ukuba ziyatshintshana kwaye zisebenza ngokuthembekileyo, abathengi kufuneka bacacise izitywino ezihambelana nemigangatho eyaziwayo, ingakumbi i-EN 12756 (eyayisakuba yi-DIN 24960). Ukunamathela kule migangatho kuqinisekisa ukuba isitywino siya kungena kwiibhokisi zokufunxa ezisemgangathweni ngaphandle kwesidingo somatshini owenziwe ngokwezifiso okanye iipleyiti zegland ezikhethekileyo.

Isiqinisekiso somthengisi sibaluleke ngokulinganayo.Abathengi bemizi-mvelisokufuneka baqinisekise ukuba abavelisi besitywino banesatifikethi se-ISO 9001 kwaye banokubonelela ngokulandeleka kwezinto ze-elastomers kunye nezixhobo zobuso. Abavelisi abakumgangatho ophezulu bahlala begcina amazinga eziphene zokuvelisa angaphantsi kwe-0.5%. Ukucela idatha yokulawula inkqubo yezibalo (i-SPC) yobuso obuthe tyaba kunye nokuqina kwayo kunokukhusela ngakumbi ekufumaneni izinto ezingaphantsi komgangatho.

Indlela Abathengi Abafanele Bathathe Isigqibo Ngayo

Ukuthenga izitywino zoomatshini ezingaphantsi kwe-elastomer kufuna ulungelelwaniso olucwangcisiweyo phakathi kweendleko zeyunithi zangaphambili kunye nokuthembeka kokusebenza kwexesha elide. Nangona ezi zitywino zihlala zijongwa njengezinto ezisetyenziswayo, ukuzijonga njengezinto ezingabizi kakhulu kunokukhokelela kwixesha lokungasebenzi kakuhle kokugcinwa kunye neendleko zobunini ezinyuswe kakhulu (TCO).

Abathengi kufuneka bavavanye iimfuno ezithile zeenqwelo zabo zezixhobo ezijikelezayo baze bamisele iindlela zokuthenga ezibeka phambili iMean Time Between Failures (MTBF) kunokonga okuncinci kwinkcitho yokuqala yemali. Isakhelo sesigqibo esicwangcisiweyo siqinisekisa ukuba iinkcukacha zesitywina ziyahambelana neenjongo zokuthembeka kwezityalo.

Iikhrayitheriya zeendleko zokuthenga kunye nomjikelo wobomi

Ixabiso lokuqala lokuthenga isitywina esingaphantsi se-elastomer lixhomekeke kakhulu kubungakanani kunye nolwakhiwo lwezinto. Izitywina eziqhelekileyo ze-NBR/Carbon/Ceramic ezithengwa ngobuninzi obukhulu (Ubuncinane boMyalelo weeyunithi ezili-100 ukuya kwezingama-500) zinokubiza kancinci njenge-$10 ukuya kwi-$50 ngeyunithi nganye. Nangona kunjalo, ukuphuculwa kwezinto zobuso zeprimiyamu ezifana neSilicon Carbide (SiC) okanye iTungsten Carbide (TC) ukuze kuliwe nokonakala okurhabaxa kuya kunyusa ixabiso lokuqala nge-30% ukuya kwi-50%.

Njengoko i-lifecycle cost matrix ibonisa, ukunyuka okuphakathi kweendleko zokuqala zokuthenga izinto zobuso eziqinileyo kunye nee-elastomers ezihlala ixesha elide kulula ukuzithethelela ngokwandiswa okukhulu kwi-MTBF.

Izinto ezibalulekileyo ekufuneka ziqwalaselwe

• Izigqibo ezibalulekileyo kunye nesizathu se-Elastomer Bellow Mechanical Seal
• Iinkcukacha, ukuthobela imithetho, kunye nokuhlolwa komngcipheko okufuneka kuqinisekiswe ngaphambi kokuba uzibophelele
• Amanyathelo alandelayo asebenzayo kunye nezilumkiso abafundi abanokuzisebenzisa ngoko nangoko

Imibuzo ebuzwa qho

Isetyenziselwa ntoni i-elastomer bellow mechanical seal?

Ivala izixhobo ezijikelezayo ezifana neempompo ze-centrifugal, ii-mixers, kunye nee-agitators, ikakhulu kwiinkonzo zoxinzelelo oluphantsi ukuya koluphakathi apho kufuneka ulawulo oluthembekileyo lokuvuza kunye nokugcinwa okulula.

I-elastomer bellow seal yahluke njani kwi-pusher seal?

Isebenzisa i-flexible elastomer bellow endaweni ye-sliding secondary O-ring, enceda ekuthinteleni ukuxinana kwe-shaft, inciphise umngcipheko wokuxhoma, kwaye yenza kube lula ukusebenza kwiindawo ezingcolileyo okanye ezikhupha i-scaling.

Ziziphi iingenelo eziphambili ze-elastomer bellow mechanical seals?

Zibonelela ngoyilo oluncinci, iindawo ezimbalwa ezishukumayo ezitywiniweyo, ukulungiswa kokuguguleka okuhle, kunye nokhuseleko olungcono ekuvuzeni okubangelwa kukunamathela kwe-O-ring kwishaft.

Ngawaphi amashishini asebenzisa rhoqo i-elastomer bellow seals?

Zisetyenziswa kakhulu ekucoceni amanzi, ekucubunguleni iikhemikhali, kwiinkqubo zaselwandle, kwi-pulp nakwiphepha, kwizikhululo zamandla, nasekugcinweni kweepompo zemizi-mveliso ngokubanzi.

Ngaba iVictor Seals inokubonelela ngee-seals ezifakwe i-elastomer ezifakwe kwi-OEM pumps?

Ewe. I-Victor Seals inikezela nge-elastomer engaphantsi kunye ne-OEM-ehambelanayo ne-elastic kwiimveliso ezifana neGrundfos, Flygt, Alfa Laval, IMO, Lowara, kunye ne-Allweiler zokulungisa nokulungisa.