Ukuba uhamba ujikeleza iworkshop yezityalo zemichiza, ngokuqinisekileyo uya kuyibona eminye imibhobho exhotyiswe ngeevalvu ezinentloko engqukuva, eziziivalvu ezilawulayo.
Ivalve yokulawula i-diaphragm yomoya
Unokwazi ulwazi oluthile malunga nevalve elawulayo kwigama layo.Igama eliphambili elithi "umgaqo" kukuba uluhlu lwalo lohlengahlengiso lunokulungiswa ngokungqongqo phakathi kwe-0 kunye ne-100%.
Abahlobo abanyamekileyo kufuneka bafumanise ukuba kukho isixhobo esijingayo phantsi kwentloko yevalve yokulawula nganye.Abo baqheleneyo nayo kufuneka bazi ukuba le yintliziyo yevalve elawulayo, i-valve positioner.Ngesi sixhobo, umthamo womoya ongena entloko (ifilimu ye-pneumatic) unokulungiswa.Lawula ngokuchanekileyo indawo yevalvu.
Izilungisi zevalvu zibandakanya abaxholi abakrelekrele kunye neendawo zokubeka oomatshini.Namhlanje sixoxa ngesikhundla sokugqibela somatshini, esifana neso esiboniswe emfanekisweni.
Umgaqo wokusebenza we-mechanical valve positioner
Idayagram yesakhiwo sendawo yevalvu
Umfanekiso uchaza ngokwesiseko amacandelo omatshini wokubeka ivalve yepneumatic nganye nganye.Inyathelo elilandelayo kukubona ukuba isebenza njani?
Umthombo womoya uvela kumoya oxinanisiweyo wesikhululo secompressor yomoya.Kukho ivalve yokunciphisa uxinzelelo lomoya phambi kwendawo yokungena yomthombo womoya yevalve yendawo yokucoca umoya oxinanisiweyo.Umthombo womoya ophuma kwindawo yokuphuma yevalve yokunciphisa uxinzelelo ungena usuka kwindawo yokubeka ivalve.Ubungakanani bomoya ongena kwintloko ye-membrane ye-valve inqunywe ngokuhambelana nomqondiso wokuphuma komlawuli.
Imveliso yesignali yombane ngumlawuli ngu-4 ~ 20mA, kunye ne-pneumatic signal yi-20Kpa ~ 100Kpa.Ukuguqulwa kombane kwisignali ye-pneumatic kwenziwa ngokuguqula umbane.
Xa isiphumo sombane sombane sisilawuli siguqulwa sibe ngumqondiso wegesi ohambelanayo, umqondiso wegesi oguqulwayo emva koko usebenze kwi-bellows.I-Lever 2 ijikeleza i-fulcrum, kwaye icandelo elisezantsi le-lever 2 liya ngasekunene kwaye lisondela emlonyeni.Uxinzelelo lwangasemva lombhobho luyanda, kwaye emva kokunyuswa yi-pneumatic amplifier (icandelo elingaphantsi kwesimboli emfanekisweni), inxalenye yomthombo womoya ithunyelwa kwigumbi lomoya le-diaphragm ye-pneumatic.Isiqu sevalve sithwala i-valve core ukuya ezantsi kwaye ngokuzenzekelayo sivula ivalve.yiba mncinci.Ngeli xesha, intonga yempendulo (intonga yokujingi emfanekisweni) eqhagamshelwe kwisikhondo sevalve ihla ijikeleze ifulcrum, ibangela ukuba isiphelo sangaphambili seshafti siye ezantsi.Ikhamera ye-eccentric exhunywe kuyo ijikeleza i-counterclockwise, kwaye i-roller ijikeleza nge-clockwise kwaye ihambela ngakwesobunxele.Yolula intwasahlobo impendulo.Ekubeni icandelo elisezantsi lempendulo yentwasahlobo yolula i-lever 2 kwaye ihambela ngakwesobunxele, iya kufikelela kwi-balance balance kunye noxinzelelo lwesignali esebenza kwi-bellows, ngoko i-valve igxininiswe kwindawo ethile kwaye ayihambi.
Ngokusebenzisa lentshayelelo engentla, kufuneka ube nokuqonda okuthile kwesixhobo sokubekwa kwevalvu ngoomatshini.Xa unethuba, kungcono ukuba uyiqhawule kube kanye ngelixa uyisebenzisa, kwaye wenze nzulu indawo yelungu ngalinye lendawo kunye negama lendawo nganye.Ke ngoko, ingxoxo emfutshane yeevalvu zoomatshini ifikelela esiphelweni.Okulandelayo, siya kwandisa ulwazi ukuze sifumane ukuqonda okunzulu kweevalvu zokulawula.
ukwandiswa kolwazi
Ukwandiswa kolwazi enye
Ivalve yokulawula i-pneumatic diaphragm emfanekisweni luhlobo oluvaliweyo lomoya.Abanye abantu bayabuza, kutheni?
Okokuqala, jonga i-air inlet direction ye-diaphragm ye-aerodynamic, enefuthe elihle.
Okwesibini, jonga ulwalathiso lofakelo lwe-valve core, olulungileyo.
Umthombo wokuphefumla wegumbi lomoya we-diaphragm, i-diaphragm icinezela phantsi imithombo emithandathu egqunywe yi-diaphragm, ngaloo ndlela ityhala isikhondo sevalve ukuba siye ezantsi.Isiqu sevalve sidityaniswe kumbindi wevalve, kwaye undoqo wevalve ufakwe phambili, ngoko ke umthombo womoya sisivalo Hambisa kwindawo yokuvala.Ngoko ke, ibizwa ngokuba yivalve yokuvala umoya.Impazamo evulekileyo ithetha ukuba xa unikezelo lomoya luphazamisekile ngenxa yokwakhiwa okanye ukubola kombhobho womoya, ivalve iphinda isetwe phantsi kwamandla okusabela entwasahlobo, kwaye ivalve ikwindawo evuleke ngokupheleleyo kwakhona.
Uyisebenzisa njani ivalve yokuvala umoya?
Indlela yokuyisebenzisa ithathwa kwimbono yokhuseleko.Le yimeko eyimfuneko yokukhetha ukuba uvule okanye ucime umoya.
Umzekelo: igubu lomphunga, esinye sezixhobo eziphambili zebhoyila, kunye nevalve elawulayo esetyenziswa kwinkqubo yonikezelo lwamanzi kufuneka ivalwe ngomoya.Ngoba?Ngokomzekelo, ukuba umthombo wegesi okanye ukunikezelwa kwamandla ngokukhawuleza kuphazamisekile, isithando somlilo sisavutha ngamandla kwaye ngokuqhubekayo sifudumeza amanzi kwi-drum.Ukuba igesi isetyenziselwa ukuvula i-valve yokulawula kwaye amandla aphazamisekile, i-valve iya kuvalwa kwaye i-drum iya kutshiswa ngaphandle kwemizuzu ngaphandle kwamanzi (ukutshisa okomileyo).Oku kuyingozi kakhulu.Akunakwenzeka ukujongana nokungaphumeleli kwe-valve elawulayo ngexesha elifutshane, okuya kubangela ukucinywa kwesithando somlilo.Iingozi zenzeka.Ngoko ke, ukuphepha ukutshisa okomileyo okanye iingozi zokucima isithando somlilo, ivalve yokuvala igesi kufuneka isetyenziswe.Nangona amandla ephazamisekile kwaye i-valve elawulayo ikwindawo evuleke ngokupheleleyo, amanzi ahlala etyiswa kwi-drum yomphunga, kodwa ayiyi kubangela imali eyomileyo kwi-drum yomphunga.Kusekho ixesha lokujongana nokungaphumeleli kwevalve elawulayo kwaye isithando somlilo asiyi kuvalwa ngokuthe ngqo ukujongana nayo.
Ngokusebenzisa le mizekelo ingasentla, ngoku kufuneka ube nokuqonda kwangaphambili malunga nendlela yokukhetha iivalvu zolawulo lokuvula umoya kunye neevalvu zokulawula ukuvala umoya!
Ukwandiswa koLwazi 2
Olu lwazi luncinci malunga notshintsho kwimiphumo emihle kunye nembi ye-locator.
Ivalve elawulayo kumfanekiso isebenza kakuhle.Ikhamera ye-eccentric inamacala amabini AB, A imele icala langaphambili kwaye u-B umele icala.Ngeli xesha, icala elingu-A lijonge ngaphandle, kwaye ukujikela icala lika-B ngaphandle kukusabela.Ke ngoko, ukutshintsha isalathiso esingu-A emfanekisweni ukuya kwicala elingu-B kukusabela komatshini wokumisa ivalvu.
Umfanekiso wangempela kumfanekiso yi-valve-positive-acting positioner, kunye ne-control control signal signal yi-4-20mA.Xa i-4mA, isignali yomoya ehambelanayo yi-20Kpa, kwaye i-valve yokulawula ivulekile ngokupheleleyo.Xa i-20mA, isignali yomoya ehambelanayo yi-100Kpa, kwaye i-valve yokulawula ivalwe ngokupheleleyo.
Izivalo zevalvu zoomatshini zineengenelo kunye nezingeloncedo
Iingenelo: ulawulo oluchanekileyo.
Ukungalungi: Ngenxa yolawulo lwe-pneumatic, ukuba isignali yendawo kufuneka ibuyiselwe kwigumbi lokulawula eliphakathi, kufuneka isixhobo esongezelelweyo sokuguqula umbane.
Ukwandiswa kolwazi lwesithathu
Imiba enxulumene nokuphazamiseka kwemihla ngemihla.
Ukusilela ngexesha lenkqubo yemveliso kuqhelekile kwaye kuyinxalenye yenkqubo yokuvelisa.Kodwa ukuze kugcinwe umgangatho, ukhuseleko kunye nobuninzi, iingxaki kufuneka zisingathwe kwangexesha.Eli lixabiso lokuhlala kwinkampani.Ngoko ke, siza kuxubusha ngokufutshane izinto ezininzi eziphosakeleyo eziye zadibana nazo:
1. Imveliso yesiphawuli sevalvu ifana nofudo.
Musa ukuvula isiciko sangaphambili sendawo yokubeka ivalve;mamela isandi ukuze ubone ukuba umbhobho womthombo womoya ugqabhukile kwaye ubangela ukuvuza.Oku kunokugwetywa ngeso lenyama.Kwaye umamele ukuba kukho nasiphi na isandi sokuvuza ukusuka kwigumbi lokungenisa umoya.
Vula isiciko sangaphambili sendawo yokubeka ivalve;1. Ingaba i-orifice engaguqukiyo ivaliwe;2. Qwalasela indawo yebhaffle;3. Jonga ukunwebeka kwentwasahlobo yengxelo;4. Nciphisa ivalve yesikwere kwaye ujonge i-diaphragm.
2. Imveliso yevalvu yendawo iyadika
1. Khangela ukuba uxinzelelo lomthombo womoya luphakathi koluhlu oluchaziweyo kunye nokuba intonga yempendulo iwile.Eli lelona nyathelo lilula.
2. Khangela ukuba ngaba umgca womgca wesignali uchanekile (iingxaki ezivela kamva azinakwa)
3. Ingaba kukho into ebambekayo phakathi kwekhoyili kunye nesixhobo sokukhusela?
4. Khangela ukuba indawo ehambelanayo yomlomo kunye ne-baffle ifanelekile.
5. Jonga imeko yekhoyili yecandelo le-electromagnetic
6. Khangela ukuba indawo yokulungelelaniswa kwentwasahlobo yebhalansi ifanelekile
Emva koko, i-signal igalelo, kodwa uxinzelelo lwemveliso alutshintshi, kukho imveliso kodwa ayifikeleli kwixabiso eliphezulu, njl. Ezi ziphoso nazo zidibene neempazamo zemihla ngemihla kwaye aziyi kuxoxwa apha.
Ukwandiswa kolwazi lwesine
Ukulawula ukulungiswa kwe-valve stroke
Ngethuba lenkqubo yokuvelisa, ukusebenzisa i-valve yokulawula ixesha elide kuya kukhokelela kwi-stroke engachanekanga.Ngokuqhelekileyo, kukho impazamo enkulu xa uzama ukuvula indawo ethile.
I-stroke yi-0-100%, khetha indawo ephezulu yokulungelelanisa, eyi-0, 25, 50, 75, kunye ne-100, zonke zichazwe njengeepesenti.Ngokukodwa kwi-valve positioners mechanical, xa kulungiswa, kuyimfuneko ukwazi izikhundla zamacandelo amabini okwenziwa ngesandla ngaphakathi kwendawo yokubeka, oko kukuthi uhlengahlengiso lwe-zero kunye nohlengahlengiso lwexesha.
Ukuba sithatha ivalve elawulayo yokuvula umoya njengomzekelo, yilungise.
Inyathelo 1: Kwinqanaba lohlengahlengiso lwe-zero, igumbi lokulawula okanye i-generator yesignali inika i-4mA.Ivalve yokulawula kufuneka ivalwe ngokupheleleyo.Ukuba ayinakuvalwa ngokupheleleyo, yenza uhlengahlengiso lweqanda.Emva kokuba ulungelelaniso lwe-zero lugqityiwe, lungisa ngokuthe ngqo i-50% iphuzu, kwaye ulungelelanise i-span ngokufanelekileyo.Ngexesha elifanayo, qaphela ukuba intonga yempendulo kunye nesiqu se-valve kufuneka ibe kwindawo ethe nkqo.Emva kokuba ulungelelaniso lugqityiwe, lungisa inqaku le-100%.Emva kokuba ulungelelaniso lugqityiwe, hlengahlengisa ngokuphindaphindiweyo ukusuka kumanqaku amahlanu phakathi kwe-0-100% de ukuvulwa kuchanekile.
Isiphelo;ukusuka kwindawo yomatshini ukuya kwindawo ekrelekrele.Ngokwembono yenzululwazi kunye nethekhinoloji, uphuhliso olukhawulezayo lwenzululwazi kunye nethekhinoloji lunciphise ubuninzi bomsebenzi wabasebenzi abaphambili bolondolozo.Ngokwam, ndicinga ukuba ukuba ufuna ukusebenzisa izakhono zakho kunye nokufunda izakhono, indawo esebenza ngoomatshini yeyona ilungileyo, ngakumbi kubasebenzi besixhobo esitsha.Ukuyibeka ngokucacileyo, i-locator ehlakaniphile inokuqonda amagama ambalwa kwincwadana kwaye ushukumise iminwe yakho.Iya kulungelelanisa ngokuzenzekelayo yonke into ukusuka ekulungiseni indawo ye-zero ukulungelelanisa uluhlu.Linda nje ukuba igqibe ukudlala kwaye ucoce indawo.Hamba nje.Kuhlobo lomatshini, iindawo ezininzi kufuneka zichithwe, zilungiswe kwaye ziphinde zifakwe nguwe.Oku ngokuqinisekileyo kuya kuphucula amandla akho ezandla kwaye kukwenze uchukumiseke ngakumbi ngesakhiwo sayo sangaphakathi.
Kungakhathaliseki ukuba ikrelekrele okanye ayinangqondo, idlala indima ephambili kuyo yonke inkqubo yokuvelisa ngokuzenzekelayo.Emva kokuba "ibethe", akukho ndlela yokulungelelanisa kwaye ulawulo oluzenzekelayo alunantsingiselo.
Ixesha lokuposa: Aug-31-2023