Imikhiqizo

Indlela Yokukhetha I-Mechanical Seal Design

Aug 03,2021

Ukukhethwa kohlobo lwesakhiwo sophawu lwemishini kuyisinyathelo esibalulekile enqubweni yokuklama, kumele kuphenywe kuqala:
Imingcele ye-1.Working -Ingcindezi yemidiya, izinga lokushisa, ububanzi be-shaft kanye nesivinini.
2. Izici ezimaphakathi - ukugxila, i-viscosity, i-causticity, enezinhlayiya eziqinile noma ezingenazo kanye nokungcola kwefayibha, noma ngabe kulula ukuhwamuka noma ukucwebezela.
3. Izici zokusebenza komsingathi nezimo zemvelo - ukusebenza okuqhubekayo noma kwezikhawu; Umsingathi ufakwa egumbini noma obala;Izakhiwo ezizungezile kanye nezinga lokushisa liyashintsha.
4. Inqwaba yophawu ukuze ivumele ukuvuza, isiqondiso sokuvuza (ukuvuza kwangaphakathi noma ukuvuza kwangaphandle) izidingo; Impilo kanye nezidingo zokwethenjelwa.
5. Ukusingatha ngosayizi wemikhawulo yesakhiwo sophawu.
6. Ukusebenza kanye nokuzinza kwenqubo yokukhiqiza.
Okokuqala, ngokuya ngemingcele yokusebenza P, V, T ukukhethwa:

Lapha u-P ukucindezela okuphakathi endaweni yophawu.Kuye ngosayizi wevelu engu-P, kunganqunywa ekuqaleni ukuthi kufanele kukhethwe isakhiwo esinokulinganisela kanye nezinga lebhalansi.Ngokwe-viscosity ephezulu emaphakathi, i-lubricity enhle, p ≤ 0.8MPa, noma i-viscosity ephansi, ukuthambisa okuphakathi nendawo, p ≤ 0.5MPa, ngokuvamile isebenzisa isakhiwo esingalingani.Lapho inani le-p lidlula ububanzi obungenhla, isakhiwo esilinganisiwe kufanele sicatshangelwe.Lapho i-P ≥ 15MPa, isakhiwo esilinganiselwe esiphelele esiphelele sinzima ukuhlangabezana nezidingo zokuvala, kulokhu ingasetshenziswa ochungechungeni lwe-multi-terminal seal.
U-U isivinini esiyisiyingi sobubanzi obuyisilinganiso bondawo yokuvala, futhi inquma ukuthi into enwebekayo izungeza ne-eksisi ngokwenani levelu lika-U, esebenzisa uhlobo lwentwasahlobo olujikelezayo noma isakhiwo esilayishwe intwasahlobo. Ngokuvamile U ngaphansi kwe-20-30m / s ingasetshenziswa ukujikeleza kohlobo lwentwasahlobo, izimo zejubane eliphakeme, ngenxa yekhwalithi engalingani yezingxenye ezijikelezayo ziholela kalula ekudlidlizeni okuqinile, kungcono ukusebenzisa isakhiwo se-spring static.Uma inani le-P ne-U zombili ziphakeme, cabangela ukusetshenziswa kwesakhiwo se-hydrodynamic.
I-T isho izinga lokushisa eliphakathi nendawo egumbini elivaliwe, ngokuya ngosayizi ka-T ukuze kunqunywe indandatho eyisizayo yokuvala, indlela yokupholisa indawo yokuvala uphawu kanye nohlelo lwayo olusizayo.Izinga lokushisa T phakathi nobubanzi obungu-0-80 ℃, indandatho eyisiza ngokuvamile kukhethwa i-nitrile rubber O-ring;T phakathi -50 — +150℃, ngokwamandla agqwalayo abezindaba, ukukhethwa kwerabha eyi-fluorine, irabha ye-silicone noma indandatho yokugcwalisa yokupakisha ye-PTFE kuyatholakala.Lapho izinga lokushisa lingaphansi kuka -50 noma ephakeme kuno-150 ℃, irabha kanye ne-polytetrafluoroethylene izoveza izinga lokushisa eliphansi le-embrittlement noma izinga lokushisa eliphakeme ukuguga, lesi sikhathi singasetshenziswa isakhiwo sensimbi yensimbi. izinga lokushisa endaweni yokuvala, futhi izinyathelo zokupholisa ezihambisanayo kufanele zithathwe.

Okwesibili, ukukhetha ngokuya ngezici zemidiya:
I-Corrosive weak medium, ivamise ukusebenzisa isigxivizo esakhelwe ngaphakathi, ukuphela kwesimo samandla kanye nesiqondiso sokuvuza kwemidiya kunengqondo kakhulu uma kuqhathaniswa nohlobo lwangaphandle. Ngemithombo yezindaba eqinile egqwalayo, ngoba ukukhetha impahla yasentwasahlobo kunzima kakhulu, ungasebenzisa. yangaphandle noma i-polytetrafluoroethylene ivunguza isigxivizo somshini, kodwa ngokuvamile isebenza kuphela uhla lwe-P ≤ 0.2-0.3MPa.Kulula ukucwebezela, kulula ukuqinisa futhi i-viscosity medium ephezulu, kufanele isebenzise isakhiwo se-spring rotary esisodwa.Ngenxa yokuthi imithombo emincane ivaleka kalula ngezinto eziqinile, imidiya ephezulu ye-viscosity kuzobangela ukunyakaza okuncane kwesinxephezelo se-spring axial kuvinjwe.Imidiya evuthayo, eqhumayo, enobuthi, ukuze kuqinisekiswe ukuthi abezindaba abavuzi, kufanele kusetshenziswe isakhiwo esinezinhlangothi ezimbili esine-sealant (i-isolation liquid) kufanele isetshenziswe.
Ngokwalezi zinhlaka zokusebenza ezingenhla nezici zemidiya zesakhiwo esikhethiwe ngokuvamile kuwuhlelo lokuqala kuphela, ukuzimisela kokugcina kufanele futhi kucabangele izici zomphathi kanye nezimfuneko ezithile ezikhethekile zokuvala uphawu.Isibonelo, umsingathi emkhunjini ngezinye izikhathi ukuze kutholwe indawo esebenza kahle kakhudlwana, ubukhulu bophawu nendawo yokufaka kuvame ukwenziwa izidingo eziqinile.Esinye isibonelo umkhumbi-ngwenya osempompini yokudonsa amanzi, ekukhuphukeni nokwehla komkhumbi-ngwenya, ingcindezi iyahluka kakhulu.Kulezi zimo , isakhiwo esijwayelekile asikwazi ukukhethwa njalo, kodwa kufanele sakhelwe ngokukhethekile izimo ezithile zokusebenza, futhi sithathe izinyathelo ezidingekayo.


Isikhathi sokuthumela: Aug-20-2021