Intshayelelo
Kumashishini amaninzi, iimpompo ze-centrifugal zihlala zisetyenziselwa ukuthutha i-viscous fluid.Ngenxa yesi sizathu, sihlala sidibana neengxaki ezilandelayo: ingakanani i-viscosity ephezulu enokuthi i-centrifugal pump ikwazi ukuyiphatha;Yiyiphi i-viscosity encinci ekufuneka ilungiswe ekusebenzeni kwempompo ye-centrifugal.Oku kubandakanya ubungakanani bempompo (ukumpompa ukuhamba), isantya esithile (esisezantsi isantya esithile, ilahleko enkulu yedisk friction), isicelo (iimfuno zoxinzelelo lwenkqubo), uqoqosho, ukugcinwa, njl.
Eli nqaku liza kwazisa ngokweenkcukacha impembelelo ye-viscosity ekusebenzeni kwempompo ye-centrifugal, ukuzimisela kwe-viscosity correction coefficient, kunye nemibandela efuna ingqalelo kwisicelo sobunjineli obusebenzayo ngokudibanisa nemigangatho efanelekileyo kunye namava okwenza ubunjineli, ngokubhekisele kuphela.
1. Ubuninzi be-viscosity ukuba impompo ye-centrifugal inokusingatha
Kwezinye izingqinisiso zangaphandle, owona mda we-viscosity uphezulu onokuphathwa yimpompo ye-centrifugal usetwa njenge-3000~3300cSt (centisea, ilingana ne-mm²/ s).Kulo mbandela, u-CE Petersen wayenephepha lobugcisa langaphambili (elipapashwe kwintlanganiso yePacific Energy Association ngoSeptemba 1982) kwaye wabeka phambili ingxabano yokuba i-viscosity ephezulu enokuthi i-centrifugal pump ikwazi ukuyiphatha ingabalwa ngobukhulu bompompo wokuphuma. umlomo wombhobho, njengoko kubonisiwe kwiFomula (1):
Vmax=300(D-1)
Apho, i-Vm iphezulu evumelekileyo ye-kinematic viscosity SSU (i-Saybolt universal viscosity) yempompo;D yidayamitha yembhobho yokukhupha impompo (i-intshi).
Kumsebenzi wobunjineli obusebenzayo, le fomyula ingasetyenziswa njengomgaqo wesithupha kwireferensi.I-Guan Xingfan's Modern Pump Theory and Design ibambe ukuba: ngokubanzi, impompo ye-vane ifanelekile ukuhanjiswa nge-viscosity engaphantsi kwe-150cSt, kodwa iimpompo ze-centrifugal ezine-NPSHR ezingaphantsi kakhulu kune-NSHA, zingasetyenziselwa i-viscosity ye-500 ~ 600cSt;Xa i-viscosity inkulu kune-650cSt, ukusebenza kwempompo ye-centrifugal kuya kuncipha kakhulu kwaye ayifanelekanga ukusetyenziswa.Nangona kunjalo, ngenxa yokuba ipompo ye-centrifugal iqhubekile kwaye i-pulsatile xa ithelekiswa nepompo ye-volumetric, kwaye ayifuni i-valve yokukhusela kunye nomgaqo wokuhamba ulula, kuqhelekile ukusebenzisa iimpompo ze-centrifugal kwimveliso yeekhemikhali apho i-viscosity ifikelela kwi-1000cSt.I-viscosity yesicelo sezoqoqosho sepompo ye-centrifugal idla ngokukhawulelwa malunga ne-500ct, exhomekeke kakhulu kubukhulu kunye nokusetyenziswa kwempompo.
2. Impembelelo ye-viscosity ekusebenzeni kwempompo ye-centrifugal
Ilahleko yoxinzelelo, i-impeller friction kunye nelahleko yokuvuza kwangaphakathi kwi-impeller kunye nesikhokelo se-vane / i-volute flow pass of pump centrifugal ixhomekeke ubukhulu becala kwi-viscosity yolwelo olumponthiweyo.Ngoko ke, xa ukupompa ulwelo nge-viscosity ephezulu, ukusebenza okugqitywe ngamanzi kuya kulahlekelwa ukusebenza kwayo I-viscosity ye-medium inefuthe elikhulu ekusebenzeni kwempompo ye-centrifugal.Xa kuthelekiswa namanzi, okukhona i-viscosity yolwelo iphezulu, kokukhona ukuhamba okukhulu kunye nokulahleka kwentloko yempompo enikiweyo ngesantya esinikiweyo.Ngoko ke, indawo efanelekileyo yokusebenza yempompo iya kuhamba ngokukhawuleza, ukuhamba kunye nentloko kuya kuncipha, ukusetyenziswa kwamandla kuya kwanda, kwaye ukusebenza kakuhle kuya kuncipha.Uninzi lweencwadi zasekhaya kunye nezangaphandle kunye nemigangatho kunye namava okwenza ubunjineli abonisa ukuba i-viscosity inefuthe elincinci entloko kwindawo yokuvala impompo.
3. Ukumiselwa kwe-coefficient yokulungiswa kwe-viscosity
Xa i-viscosity idlula i-20cSt, umphumo we-viscosity ekusebenzeni kwempompo ibonakala.Ngoko ke, kwizicelo zobunjineli obusebenzayo, xa i-viscosity ifikelela kwi-20cSt, ukusebenza kwepompo ye-centrifugal kufuneka kulungiswe.Nangona kunjalo, xa i-viscosity ikuluhlu lwe-5 ~ 20 cSt, ukusebenza kwayo kunye namandla okuhambelana kweemoto kufuneka kuhlolwe.
Xa ukupompa i-viscous medium, kuyimfuneko ukuguqula i-curve yeempawu xa upompa amanzi.
Okwangoku, iifomyula, iitshathi kunye namanyathelo okulungisa amkelwe yimigangatho yasekhaya nangaphandle (efana ne-GB/Z 32458 [2], ISO/TR 17766 [3], njl.njl.) kulwelo lwe-viscous ngokusisiseko ukusuka kwimigangatho ye-American Hydraulic. Iziko.Xa ukusebenza kwempompo yokuhambisa iphakathi kwaziwa ngokuba ngamanzi, umgangatho we-American Hydraulic Institute ANSI/HI9.6.7-2015 [4] unika amanyathelo okulungisa aneenkcukacha kunye neefomyula zokubala ezifanelekileyo.
4. Amava esicelo sobunjineli
Ukusukela ekuphuhlisweni kweempompo ze-centrifugal, abanduleli beshishini lempompo baye bashwankathela iindlela ezahlukeneyo zokuguqula ukusebenza kweempompo ze-centrifugal ukusuka emanzini ukuya kwimidiya ye-viscous, nganye inezibonelelo kunye nokungalunganga:
4.1 AJStepaoff Model
4.2 Indlela yePaciga
4.3 American Hydraulic Institute
4.4 eJamani KSB indlela
5.Amanyathelo okhuseleko
5.1Imidiya esebenzayo
Itshathi yokuguqula kunye nefomula yokubala zisebenza kuphela kulwelo lwe-viscous olufana nqwa, oludla ngokubizwa ngokuba lulwelo lweNewtonian (olufana neoyile yokuthambisa), kodwa hayi kulwelo olungelulo lweNewtonian (njengolwelo olunefayibha, ikhrimu, ipulp, ulwelo lomxube wamalahle, njl.njl. .)
5.2 Ukuqukuqela okusebenzayo
Ukufunda akusebenzi.
Okwangoku, iifomyula zokulungisa kunye neetshathi ekhaya nakwamanye amazwe zisisishwankathelo sedatha ye-empirical, eya kuthintelwa ngeemeko zovavanyo.Ngoko ke, kwizicelo zobunjineli obusebenzayo, ingqwalasela ekhethekileyo kufuneka ihlawulwe: iifomyula ezahlukeneyo zokulungisa okanye iitshathi kufuneka zisetyenziswe kwiindidi zokuqukuqela ezahlukeneyo.
5.3 Uhlobo lwempompo esebenzayo
Iifomyula ezitshintshiweyo kunye neetshathi zisebenza kuphela kwiimpompo ze-centrifugal ezinoyilo oluqhelekileyo lwe-hydraulic, i-impellers ezivulekileyo okanye ezivaliweyo, kwaye zisebenza kufuphi neyona ndawo ifanelekileyo yokusebenza kakuhle (kunokuba ekupheleni kwe-curve yepompo).Iimpompo ezilungiselelwe ngokukodwa ulwelo lwe-viscous okanye olwahlukileyo alukwazi ukusebenzisa ezi fomula kunye neetshathi.
5.4 Umda wokhuseleko we-cavitation osebenzayo
Xa ukupompa i-liquid kunye ne-viscosity ephezulu, i-NPSHA kunye ne-NPSH3 kufuneka ibe nomda wokhuseleko olwaneleyo we-cavitation, ophezulu kunokuba uchazwe kwimigangatho ethile kunye neenkcukacha (ezifana ne-ANSI / HI 9.6.1-2012 [7]).
5.5 Abanye
I-1) Impembelelo ye-viscosity ekusebenzeni kwempompo ye-centrifugal kunzima ukubalwa ngefomula echanekileyo okanye ihlolwe ngetshathi, kwaye inokuguqulwa kuphela yi-curve efunyenwe kuvavanyo.Ke ngoko, kwizicelo zobunjineli ezisebenzayo, xa ukhetha isixhobo sokuqhuba (ngamandla), kufuneka kuqwalaselwe ukugcina umda wokhuseleko owaneleyo.
2) Ulwelo olune-viscosity ephezulu kwiqondo lobushushu begumbi, ukuba impompo (efana nobushushu obuphezulu bempompo yodaka lweyunithi yokuqhekeka kwecatalytic kwindawo yokucokisa) iqalwa kwiqondo lobushushu elisezantsi kunobushushu obuqhelekileyo bokusebenza, uyilo lomatshini lwempompo. (njengamandla e-pump shaft) kunye nokukhethwa kwe-drive kunye nokudibanisa kufuneka kuthathelwe ingqalelo impembelelo ye-torque eyenziwa ngokunyuka kwe-viscosity.Ngexesha elifanayo, kufuneka kuqatshelwe ukuba:
① Ukuze kuncitshiswe iindawo ezivuzayo (iingozi ezinokwenzeka), impompo ye-cantilever yenqanaba elinye iya kusetyenziswa kangangoko kunokwenzeka;
② Iqokobhe lempompo liya kuxhotyiswa ngebhatyi yokugquma okanye isixhobo sokujonga ubushushu ukunqanda ukuqina okuphakathi ngexesha lokuvalwa kwexesha elifutshane;
③ Ukuba ixesha lokuvalwa lide, okuphakathi kwiqokobhe kuyakuchithwa kwaye kucocwe;
④ Ukuthintela ukuba impompo ingabi nzima ukuyichitha ngenxa yokuqina kwe-viscous medium kwiqondo lobushushu eliqhelekileyo, iziqhoboshi ezikwindlu yempompo kufuneka zikhululwe kancinci phambi kokuba ubushushu obuphakathi buhle bufike kwiqondo lobushushu eliqhelekileyo (nikela ingqalelo kukhuseleko lwabasebenzi ukunqanda ukutshisa. ), ukuze umzimba wempompo kunye nesigqubuthelo sempompo unokwahlulwa kancinci.
3) Impompo enesantya esiphezulu esiphezulu iya kukhethwa kangangoko kunokwenzeka ukuthutha i-viscous liquid, ukwenzela ukunciphisa impembelelo ye-viscous liquid ekusebenzeni kwayo kunye nokuphucula ukusebenza kwepompo ye-viscous.
6. Isiphelo
I-viscosity ye-medium inempembelelo enkulu ekusebenzeni kwempompo ye-centrifugal.Impembelelo ye-viscosity ekusebenzeni kwepompo ye-centrifugal kunzima ukubalwa ngefomula echanekileyo okanye ihlolwe ngetshathi, ngoko ke iindlela ezifanelekileyo kufuneka zikhethwe ukulungisa ukusebenza kompompo.
Kuphela xa i-viscosity yangempela ye-pumped medium iyaziwa, inokukhethwa ngokuchanekileyo ukuphepha iingxaki ezininzi kwi-site ezibangelwa ngumahluko omkhulu phakathi kwe-viscosity enikeziweyo kunye ne-viscosity yangempela.
Ixesha lokuposa: Dec-27-2022