Kodi NPSH ndi momwe mungapewere cavitation phenomenon

NPSH ndi gawo lofunikira lomwe limayesa kuthekera kwa mpope kapena makina ena amadzimadzi kuti ateteze kutulutsa kwamadzi pamikhalidwe inayake. Imaimira mphamvu owonjezera pa unit kulemera kwa madzi pa mpope polowera kuti kuposa kuthamanga vaporization.

Chodabwitsa cha cavitation ndi chifukwa cha mpweya kwaiye ndi madzi pa polowera wa impeller pansi pa zina vakuyumu kuthamanga pa ntchito mpope, kupanga thovu. Izi thovu, pansi zimakhudza kayendedwe ka madzi particles, chifukwa kukokoloka kwa zitsulo pamwamba pa choyikapo, potero kuwononga impeller ndi zitsulo zina. Pofuna kupewa cavitation, zotsatirazi zikhoza kuchitidwa:

Wonjezerani kukakamiza kuchokera kunja. Powonjezera kukakamiza kolowera, kuthamanga kwamadzimadzi kumatha kuwonjezeka ndipo kupezeka kwa cavitation kumatha kuchepetsedwa.

Chepetsani kuthamanga. Kuchepetsa kuthamanga kwa madzimadzi kumatha kuchepetsa kuchepa kwa kuthamanga kwamadzimadzi, kuchepetsa mapangidwe a thovu, ndikuletsa kuchitika kwa cavitation phenomena.

Sinthani kapangidwe ka zida. Mwa kuwongolera kapangidwe ka zida, kutsika kwamadzimadzi kumatha kuchepetsedwa, ndikulepheretsa kuchitika kwa thovu ndi cavitation.

Onjezerani malire a cavitation. NPSHa yothandiza ndi NPSHa ya chipangizo (paipi), yomwe imagwirizana ndi njira yoyika mpope. Kuchulukitsa mtengo wake kumatha kupititsa patsogolo ntchito ya anti cavitation ya mpope.

Chepetsani NPSH yofunikira. NPSHr ndi gawo lofunikira la magwiridwe antchito a mpope palokha, ndipo kuchepetsa mtengo wake kumatha kupititsa patsogolo ntchito ya anti cavitation ya mpope.

Kupyolera mu miyeso iyi, cavitation ikhoza kupewedwa bwino ndipo ntchito yabwino ya mapampu ndi makina ena amadzimadzi amatha kutetezedwa.

Mapampu ambiri amatha kukulitsa kutalika kwawo koyamwa, koma sangathe kuthana ndi vuto la cavitation. Mtengo VSPamphamvu vacuum self priming mpopeali ndi ntchito yabwino yotsutsa cavitation, yokhala ndi kutalika kokwanira kopitilira 8 metres, ndipo sipanga chodabwitsa cha cavitation.