Ukusebenzisa ngempumelelo i-PTFE ku-a iphampu yecala lokuhlukaniswa kwe-axial , kubalulekile ukuqonda izici zalolu lwazi. Ezinye zezinto ezihlukile ze-PTFE ziyenza ibe yinto enhle kakhulu yokupakisha okulukiwe:

1. Ukumelana kwamakhemikhali okuhle kakhulu. Isizathu esikhulu sokusebenzisa i-PTFE ekupakisheni ukuthi ayithinteki uketshezi oluhlukahlukene olubolayo, okuhlanganisa ama-asidi aqinile, izisekelo, nezincibilikisi. Mhlawumbe okubaluleke kakhulu, i-PTFE ingakwazi ukumelana nama-oxidizing agents aqinile njenge-nitric acid, i-chlorine dioxide, ne-sulfuric acid egxilile kakhulu (i-oleum).

2. I-coefficient ephansi yokungqubuzana lapho uthintana nezindawo eziningi. I-PTFE yaziwa ngokungamanzisi, ibushelelezi, futhi ayinayo i-coefficient ephansi yezakhiwo zokungqubuzana. Lokhu kusiza ukunciphisa ukusetshenziswa kwamandla nokukhiqiza ukushisa kusixhumi esibonakalayo se-packing-shaft.

Nakuba i-PTFE inezinzuzo zayo, ezinye zezindawo zayo azilungile ezinhlelweni eziningi zokupakisha zephampu. Izinkinga ezihlangatshezwana nokupakishwa kwe-PTFE ngokuvamile zibangelwa izici zayo ezingezinhle ezishisayo nezemishini:

1. I-deformation ebandayo noma inyakaze ngaphansi kwengcindezi. I-Creep ikhuphuka ngokukhuphuka kwezinga lokushisa. Uma ingcindezi isetshenziswa ku-100% PTFE ukupakisha isikhathi esithile, ukupakisha kungase kube okuqinile okuqinile futhi kudinga ukulungiswa njalo ukugcina uphawu. Iphinde ibe nokuthambekela kokukhama izikhala ezingaphezulu neziphansi zebhokisi lokugxusha lika-a iphampu yecala lokuhlukaniswa kwe-axial.

2. I-conductivity ephansi yokushisa. Uma ukushisa okungqubuzanayo kukhiqizwa ngokuthintana ne-shaft ezungezisayo enesivinini esikhulu, i-PTFE emsulwa inomkhuba wokumunca ukushisa futhi ayikwazi ukukuhlakaza endaweni ezungezile. Ukuvimbela ukupakishwa kwe-PTFE ekushiseni noma ekushiseni, izinga lokuvuza eliphezulu liyadingeka endaweni yokupakisha-shaft.

3. I-coefficient yokwandisa ukushisa okuphezulu. Njengoba izinga lokushisa likhuphuka, i-PTFE inweba ngokushesha kakhulu kunensimbi ezungezile. Lokhu kunwetshwa kwandisa ingcindezi yokupakisha ku-axial split case pump shaft kanye ne-bore.

I-PTFE Fiber Packing

Abakhiqizi abaningi bakhiqiza ukupakisha okusebenzisa i-PTFE njengefayibha eyisisekelo. Le mikhiqizo ingahlinzekwa njengemicu eyomile, imicu ehlanganiswe ne-PTFE dispersions, noma imicu egcotshwe ngezinto zokugcoba ezihlukahlukene. Kungumkhuba omuhle ukusebenzisa le mikhiqizo kuphela uma ingekho enye indlela ye-PTFE, okuhlanganisa izinhlelo zokusebenza ezinamakhemikhali abolayo njengama-oxidizer aqinile, noma ukudla noma izinqubo zemithi.

Ngokupakishwa kwefayibha ye-PTFE, kubaluleke kakhulu ukuthobela imikhawulo yomkhiqizi kuzinga lokushisa, isivinini, nokucindezela. Lokhu kupakisha kuzwela kakhulu ekulungisweni lapho kusetshenziswa imishini ezungezisayo. Ngokuvamile, izingcindezi ze-gland eziphansi kanye namazinga aphezulu okuvuza ayadingeka kunezinye ukupakisha.

Ukupakisha Kwe-Polytetrafluoroethylene (ePTFE) Enwetshiwe

Izintambo ze-ePTFE zifana ngokubukeka netheyiphu ye-PTFE. Ifomu elivame kakhulu i-ePTFE efakwe i-graphite ukuze kuthuthukiswe ukusebenza kwayo okushisayo nokulinganisa isivinini. Ama-braids e-ePTFE azwela kancane ekwakhiweni kokushisa kune-PTFE fiber packing. Ukupakisha kwe-ePTFE kungase kube nokuwohloka okubandayo kanye nokukhishwa kwezingcindezi eziphezulu.

PTFE Coated ukupakisha

Lapho ukumelana okuhle kwamakhemikhali kwe-PTFE okuhlanzekile kungadingeki, i-PTFE ingambozwa ezintweni eziningi zefayibha ukuthuthukisa ukusebenza kokupakisha futhi isebenzise izinzuzo ze-PTFE. Le micu ingasiza futhi ukunciphisa noma ukuqeda obunye bobuthakathaka bemiluko emsulwa ye-PTFE.

Izintambo ezihlanganisiwe zefayibha yokwenziwa nengilazi zingagcotshwa nge-PTFE ukuze kukhiqizwe ukupakisha okongayo, okuguquguqukayo okunokuqina okuphezulu, ukumelana ne-extrusion okukhulu, nokuzwela okuncane kokulungisa kune-PTFE fiber braids. Angaphinda ahlanganiswe nenhlanganisela ehlakaziwe ye-PTFE kanye ne-graphite ukuze kuthuthukiswe amandla ejubane lomluko kanye nezici zokuqeda ukushisa.

Ukupakisha i-Aramid fiber enezingubo ze-PTFE kungasetshenziswa lapho kudingeka ukumelana nokugqoka ngokweqile. I-Novoid fiber packing ene-PTFE coating ingasetshenziswa ezinsizakalweni ezigqwala kancane futhi inokuqina okungcono nokumelana nokukhishwa kune-PTFE fiber braids.

I-PTFE-coated carbon kanye nama-graphite fiber braids aphakathi kokupakisha okuguquguqukayo kakhulu. Zinokumelana okuhle kakhulu kwamakhemikhali (ngaphandle kwama-oxidizing agents aqinile), ukusebenza ngesivinini esiphezulu, ukusebenza kwezinga lokushisa eliphezulu, nokuqina okuhle kakhulu. Abavamisile ukuthamba noma ukukhipha emazingeni okushisa aphezulu futhi baphinde babonise ukumelana okuhle nokuhuzuka.

Ngokuqonda izinzuzo nemikhawulo yezinhlobo ezahlukahlukene zokupakishwa kwe-PTFE ephothiweyo, ungakhetha umkhiqizo ozohlangabezana ngokuphumelelayo nephampu yakho yecala elihlukanisiwe le-axial noma izidingo zokuvala inqubo ye-valve.