Ndi chiyanivalavucavitation? Kodi kuthetsa izo?
Malingaliro a kampani Tianjin Tanggu Water-Seal Valve Co., Ltd
Tianjin,CHINA
19 ndi,June,2023
Monga momwe phokoso likhoza kukhala ndi zotsatira zoipa pa thupi la munthu, maulendo ena amatha kuwononga zipangizo zamakampani pamene valavu yolamulira imasankhidwa bwino, pali chiopsezo chowonjezereka cha cavitation, chomwe chidzachititsa kuti phokoso likhale lokwera komanso kugwedezeka, zomwe zimapangitsa kuti zikhale zovuta kwambiri. mofulumira kuwonongeka kwa mkati ndi kunsi kwa mtsinje mapaipi avalavu.
Kuphatikiza apo, phokoso lalikulu nthawi zambiri limayambitsa kugwedezeka komwe kungawononge mapaipi, zida ndi zida zinaVavum'kupita kwa nthawi, kuwonongeka kwa zigawo zikuluzikulu, valavu cavitation chifukwa payipi dongosolo sachedwa kuwonongeka kwambiri. Izi kuwonongeka makamaka chifukwa kugwedera phokoso mphamvu, inapita patsogolo dzimbiri ndondomeko ndi cavitation zimaonekera ndi mkulu phokoso mlingo waukulu matalikidwe kugwedera kwaiye ndi mapangidwe ndi kugwa kwa thovu nthunzi pafupi ndi pansi pa shrinkage..
Ngakhale izi zimachitika mu mpiramavavundi mavavu ozungulira m'thupi, amatha kuchitika kwakanthawi kochepa, kofanana ndi gawo la thupi la V-mpira.valavu, makamakavalavu butterflykunsi kwa mtsinje wa valve pamenevalavuimagogomezedwa pamalo amodzi omwe amatha kukhala ndi cavitation phenomenon, yomwe imakonda kutayikira mu mapaipi a valve ndi kukonza zowotcherera, valavu siyenera gawo ili la mzere.
Mosasamala kanthu kuti cavitation imapezeka mkati mwa valavu kapena pansi pa valve, zipangizo zomwe zili m'dera la cavitation zidzawonongeka kwambiri ndi mafilimu ochepa kwambiri, akasupe ndi zigawo zazing'ono za cantilever, kugwedezeka kwakukulu kwa matalikidwe kungayambitse oscillations. Zolephera pafupipafupi zimapezeka mu zida monga ma geji okakamiza, ma transmitters, manja a thermocouple, ma flowmeters, ma sampling system Actuators, malo osinthira okhala ndi akasupe amawonongeka mwachangu, ndipo mabatani okwera, zomangira ndi zolumikizira zidzamasulidwa ndikulephera chifukwa cha kugwedezeka.
Kutentha kotentha, komwe kumapezeka pakati pa malo owonongeka omwe amagwedezeka, kumakhala kofala pafupi ndi ma cavitation valves. Izi zimapanga ma oxides olimba ngati ma abrasives kuti afulumizitse kuvala pakati pa malo owonongeka. Zida zomwe zakhudzidwa zimaphatikizapo kudzipatula ndikuwunika ma valve, kuphatikiza ma valve owongolera, mapampu, zowonera zozungulira, zitsanzo ndi makina ena aliwonse ozungulira kapena otsetsereka.
Kugwedezeka kwa matalikidwe apamwamba kungathenso kung'amba ndi kuwononga ma valve achitsulo ndi makoma a chitoliro. Zitsulo zamwazikana kapena zida zowononga zimatha kuyipitsa zowulutsa mupaipi, zomwe zitha kukhudza kwambiri mapaipi aukhondo a ma valve ndi ma media oyeretsera kwambiri. Izinso ndizosaloledwa.
Kuneneratu za kulephera kwa cavitation kwa mavavu a pulagi kumakhala kovuta kwambiri ndipo sikungowerengedwa kutsitsa kutsika kwamphamvu. Zochitika zikusonyeza kuti n'zotheka kuti kuthamanga mumtsinje waukulu kumatsikira ku mphamvu ya nthunzi yamadzimadzi pamaso pa vaporization ya m'deralo ndi kugwa kwa nthunzi kuwira. Opanga ma valve ena amalosera kulephera kwa kadamsana msanga pofotokoza kutsika kwamphamvu kwa kuwonongeka koyamba. Njira yopanga valavu yoyambira ndikulosera kuwonongeka kwa cavitation imachokera pa mfundo yakuti thovu la nthunzi limagwa, kuchititsa cavitation ndi phokoso. Zatsimikiziridwa kuti kuwonongeka kwakukulu kwa cavitation kudzapewedwa ngati phokoso lowerengedwa liri pansi pa malire omwe ali pansipa.
Kukula kwa vavu mpaka mainchesi 3 - 80 dB
Vavu kukula kwa mainchesi 4-6 - 85 dB
Vavu kukula 8-14 mainchesi - 90 dB
Kukula kwa mavavu a mainchesi 16 ndi kukulirapo - 95 dB
Njira zochotsera kuwonongeka kwa cavitation
Mapangidwe apadera a ma valve kuti athetse cavitation amagwiritsa ntchito kugawanika ndi kutsika kwapansi:
"Valve diversion" ndiyo kugawaniza kuyenda kwakukulu mumayendedwe ang'onoang'ono angapo, ndipo njira yothamanga ya valve imapangidwira kuti kutuluka kumadutsa mumitsempha yaing'ono yofanana. Popeza gawo la kukula kwa cavitation kuwira amawerengedwa kudzera kutsegula kumene otaya akudutsa. Kutsegula kwakung'ono kumapangitsa kuti tinthu tating'onoting'ono tituluke, zomwe zimapangitsa kuti phokoso likhale lochepa komanso kuwonongeka kocheperako zikafika pakuwonongeka.
"Graded pressure drop" imatanthawuza kuti valavu idapangidwa kuti ikhale ndi mfundo ziwiri kapena zingapo zosinthira mndandanda, kotero m'malo mwa kupanikizika konse mu sitepe imodzi, imatenga masitepe angapo ang'onoang'ono. Pasanathe munthu kuthamanga dontho angalepheretse kuthamanga mu shrinkage kugwa nthunzi kuthamanga kwa madzi, motero kuchotsa chodabwitsa cha cavitation mu valavu.
Kuphatikizika kwa diverting ndi kuthamanga dontho masitepe mu valavu yomweyo zimathandiza kuti cavitation kukana bwino ndi. Pakusintha valavu, kuyika valavu yowongolera ndi kukakamiza kolowera kwa valavu kumakhala kokwezeka (mwachitsanzo, kumtunda kwamtunda, kapena kumtunda wotsika), nthawi zina kumachotsa zovuta za cavitation.
Kuonjezera apo, kuika valavu yolamulira pamalo a kutentha kwa madzi, choncho kuthamanga kwa mpweya wochepa (monga kutentha kwapang'onopang'ono mbali yotentha) kungathandize kuthetsa mavuto a cavitation.
Chidulechi chawonetsa kuti cavitation phenomenon ya ma valve sikuti amangokhudza kuwonongeka kwa magwiridwe antchito komanso kuwonongeka kwa ma valve. Mapaipi otsika ndi zida zilinso pachiwopsezo. Kulosera cavitation ndikuchitapo kanthu kuti athetse ndiyo njira yokhayo yopewera vuto la ndalama zowononga ma valve.
Nthawi yotumiza: Jun-25-2023
