Ukusebenzisa ngempumelelo i-PTFE a impompo yecala lokwahlulwa kwe-axial , kubalulekile ukuqonda iimpawu zalo mbandela. Ezinye zeepropathi ezizodwa ze-PTFE ziyenza ibe yimathiriyeli egqwesileyo yokupakishwa okuphothiweyo:

1. Ukuchasana kweekhemikhali okugqwesileyo. Esona sizathu siphambili sokusebenzisa i-PTFE ekupakisheni kukuba ayichatshazelwa lulwelo olwahlukeneyo oludlayo, kubandakanywa iiasidi ezinamandla, iziseko, kunye nezinyibilikisi. Mhlawumbi okona kubaluleke kakhulu, i-PTFE inokumelana nee-oxidizing agents eziqinileyo ezifana ne-nitric acid, i-chlorine dioxide, kunye ne-sulfuric acid egxininiswe kakhulu (i-oleum).

2. I-coefficient ephantsi ye-friction xa udibana neendawo ezininzi. I-PTFE yaziwa ngokuba ne-non-wetting, smooth, kunye ne-low coefficient yeempawu zokukhuhlana. Oku kunceda ukunciphisa ukusetyenziswa kwamandla kunye nokuveliswa kobushushu kwi-packing-shaft interface.

Ngelixa i-PTFE ineengenelo zayo, ezinye zeepropathi zayo azilunganga kwizicelo ezininzi zokupakisha impompo. Iingxaki ekuhlangatyezwane nazo ngokupakishwa kwe-PTFE ziqhelekile ngenxa yeempawu zayo ezingezizo ezishushu kunye nezoomatshini:

1. Ukuguqulwa okubandayo okanye ukukhwela phantsi koxinzelelo. I-Creep iyanda ngokunyuka kobushushu. Xa uxinzelelo lusetyenziswa kwi-100% ye-PTFE yokupakisha ixesha elithile, ukupakishwa kunokuba yinto eqinile kwaye ifuna ukulungiswa rhoqo ukugcina itywina. Kananjalo unotyekelo lokucudisa ngaphandle izithuba eziphezulu nasezantsi zebhokisi yokuhlohla a impompo yecala lokwahlulwa kwe-axial.

2. I-conductivity ephantsi ye-thermal. Xa ubushushu be-friction buveliswa ngokudibana ne-high-speed-rotating shaft, i-PTFE ecocekileyo inomkhwa wokuthatha ubushushu kwaye ayikwazi ukubuchitha kwindawo engqongileyo. Ukuthintela ukupakishwa kwe-PTFE ekutshiseni okanye ekutshiseni, izinga lokuvuza eliphezulu liyafuneka kwindawo yokupakisha-shaft.

3. I-coefficient yokwandisa i-thermal ephezulu. Njengoko ubushushu bunyuka, i-PTFE ikhula ngokukhawuleza kunentsimbi ejikelezileyo. Olu lwandiso lunyusa uxinzelelo lokupakisha kwi-axial split case pump shaft kunye nebhore.

Ukupakishwa kweFayibha ye-PTFE

Abavelisi abaninzi bavelisa ukupakisha okusebenzisa i-PTFE njengesiseko sefiber. Ezi mveliso zinokubonelelwa njengeentsinga ezomileyo, iintsinga ezigqunywe nge-PTFE dispersions, okanye iifiber ezigqunywe ngezithambiso ezahlukeneyo. Kuluqhelo olulungileyo ukusebenzisa ezi mveliso kuphela xa ingekho enye indlela ye-PTFE, kubandakanywa usetyenziso oluneekhemikhali ezonakalisayo ezifana ne-oxidizers ezomeleleyo, okanye ukutya okanye iinkqubo zoxubo-mayeza.

Ukupakisha ifayibha ye-PTFE, kubaluleke kakhulu ukuthobela imida yomenzi kubushushu, isantya, kunye noxinzelelo. Oku kupakishwa kubuthathaka kakhulu kuhlengahlengiso xa kusetyenziswe izixhobo ezijikelezayo. Ngokuqhelekileyo, uxinzelelo lwamadlala aphantsi kunye namazinga aphezulu okuvuza ayafuneka kunezinye ukupakisha.

I-Polytetrafluoroethylene (ePTFE) eyandisiweyo yokuPakisha

Imisonto ye-ePTFE iyafana ngenkangeleko kwiteyiphu ye-PTFE. Eyona ndlela ixhaphakileyo yi-ePTFE efakwe kwigraphite ukuphucula ukuhanjiswa kwayo kwe-thermal kunye nesantya sokukala. Iibraids ze-ePTFE azinovelwano kangako kubushushu bokwakha kune-PTFE yokupakisha ifayibha. Ukupakisha kwe-ePTFE kunokufumana i-deformation ebandayo kunye ne-extrusion kuxinzelelo oluphezulu.

PTFE Coated ukupakisha

Xa ukuchasana kweekhemikhali okugqwesileyo kwe-PTFE ecocekileyo kungafuneki, i-PTFE inokufakwa kwizinto ezininzi zefiber ukuphucula ukusebenza kokupakisha kunye nokusebenzisa inzuzo ye-PTFE. Ezi ntsinga zinokunceda ukunciphisa okanye ukuphelisa ezinye zobuthathaka be-PTFE braids ecocekileyo.

Imisonto edityanisiweyo yefayibha yokwenziwa kunye neglasi inokugqunywa nge-PTFE ukuvelisa ukonga, ukupakisha okuguquguqukayo okunokuqina okuphezulu, ukuxhathisa okukhulu kwe-extrusion, kunye nobuthathaka obuncinci bokulungisa kune-PTFE i-fiber braids. Zisenokugqunywa ngomxube osasaziweyo we-PTFE kunye negraphite ukuqhubela phambili ukuphucula izakhono zesantya se-braid kunye neempawu zokutshatyalaliswa kobushushu.

Ukupakishwa kwefayibha ye-Aramid kunye neengubo ze-PTFE zingasetyenziswa apho ukuxhathisa okugqithisileyo kuyadingeka. I-Novoid fiber packing kunye ne-PTFE yokwambathisa ingasetyenziselwa kwiinkonzo ezinobungozi obuncinci kwaye inokuqina okungcono kunye nokumelana nokugqithisa kune-PTFE i-fiber braids.

I-PTFE-coated carbon kunye ne-graphite fibre braids ziphakathi kwezona zipakishwe zininzi. Banokumelana okugqwesileyo kweekhemikhali (ngaphandle kwee-agent ze-oxidizing ezinamandla), ukusebenza kwesantya esiphezulu, ukusebenza okuphezulu kobushushu, kunye nokuqina okuhle kakhulu. Abatyekeleli ekuthambeni okanye ekukhupheni kumaqondo obushushu aphezulu kwaye bakwabonisa ukuxhathisa okulungileyo kwe-abrasion.

Ngokuqonda iingenelo kunye nezithintelo zeendlela ezahlukeneyo zokupakishwa kwe-PTFE ephothiweyo, ungakhetha imveliso eya kuthi ihlangabezane ngokufanelekileyo nempompo yakho ye-axial yokwahlulwa kwecase okanye iimfuno zokutywinwa kwenkqubo yevalve.