Ha ho khethoa lipompo tsa metsi, haeba khetho e sa nepahale, litšenyehelo li ka 'na tsa e-ba tse phahameng kapa ts'ebetso ea sebele ea pompo e ka' na ea se ke ea finyella litlhoko tsa sebaka seo.Joale fana ka mohlala ho bontša melao-motheo eo pompo ea metsi e lokelang ho e latela.
Khetho ea pompo e monyang habeli e lokela ho ela hloko lintlha tse latelang:
1. Lebelo:
Lebelo le tloaelehileng le khethoa ho latela litlhoko tse fanoeng ke moreki.Ka tlase lebelo la pompo e tšoanang, lebelo la phallo le phahamiso e tsamaellanang le tla fokotseha.Ha u khetha mohlala, hoa hlokahala hore u se ke ua nahana ka ts'ebetso ea moruo feela, empa hape le maemo a sebaka sa marang-rang, joalo ka: viscosity ea mahareng, ho hanyetsa ho roala, bokhoni ba ho iketsetsa lintho, lintlha tsa vibrate, joalo-joalo.
2. Boikemisetso ba NPSH:
NPSH e ka khethoa ho latela boleng bo fanoeng ke moreki, kapa ho latela maemo a ho kena a pompo, mocheso o mahareng le khatello ea sepakapaka setšeng:
Palo ea bophahamo ba ho kenya pompo ea metsi (algorithm e bonolo: ho latela khatello e tloaelehileng ea sepakapaka le metsi a tloaelehileng a mocheso) e tjena:
Har'a tsona: hg - bophahamo ba ho kenngoa ha geometri (boleng bo nepahetseng ke ho hula holimo, boleng bo bobe ke ho phalla ka morao);
- Hlooho ea metsi a khatello ea sepakapaka sebakeng sa ho kenya (e baloang e le 10.33m tlasa khatello e tloaelehileng ea sepakapaka le metsi a hlakileng);
hc-ho suction hydraulic tahlehelo;(haeba phaephe ea ho kena e le khutšoanyane ebile e sa rarahana, hangata e baloa e le 0.5m)
- Hlooho ea khatello ea mouoane;(metsi a hlakileng ka mocheso oa kamore a baloa e le 0.24m)
- NPSH e lumelletsoeng;(ho netefatsa polokeho, bala ho latela NPSHr×1.2, NPSHr bona lethathamo la libuka)
Ka mohlala, NPSH NPSHr=4m: Joale: hg=10.33-0.5-0.24-(4×1.2)=4.79 m (sephetho sa tharollo ke boleng bo botle, se bolela hore se ka monya ho fihlela ho ≤4.79m, ke hore Ka hare ho 4.79m ka tlase ho moeli o bohareng, haeba e le tlas'a khatello e mpe, e tlameha ho tšeloa morao, 'me boleng ba ho tšeloa ka morao bo lokela ho ba bo boholo ho feta tekanyo e baloang, ke hore, metsi. boemo ba ho kena bo ka ba ka holimo ho boleng bo baloang ka holimo ho moeli o bohareng oa impeller).
E ka holimo e baloa tlas'a boemo ba mocheso o tloaelehileng, metsi a hlakileng le bophahamo bo tloaelehileng.Haeba mocheso, boima le bophahamo ba seaplane li sa tloaeleha, e le ho qoba cavitation le mathata a mang a amang ts'ebetso e tloaelehileng ea sete ea pompo, litekanyetso tse lumellanang li lokela ho khethoa le ho nkeloa sebaka ka mokhoa oa ho bala.Har'a tsona, mocheso le boima ba seaplane li baloa ho ea ka litekanyetso tse lumellanang le "Vaporization Pressure le Density of Water at Different Temperatures", 'me bophahamo bo baloa ho ea ka litekanyetso tse lumellanang le "Altitude le Atmospheric Pressure of Major Cities in. Naha".NPSH e 'ngoe e lumelletsoeng ke ho netefatsa polokeho, ho latela NPSHr×1.4 (boleng bona bonyane 1.4).
3. Ha khatello e kenang ea pompo e tloaelehileng e le ≤0.2MPa, ha khatello e kenang + hlooho × linako tse 1.5 ≤ khatello ea khatello, khetha ho ea ka thepa e tloaelehileng;
Khatello ea ho kena + hlooho × linako tse 1.5 > khatello ea khatello, lisebelisoa tse tloaelehileng tse finyellang litlhoko li lokela ho sebelisoa;haeba khatello ea ho kena e phahame haholo kapa khatello ea teko e phahame haholo, joalo-joalo e sa finyelle litlhoko, ka kopo netefatsa ka theknoloji ho nkela thepa sebaka kapa ho lokisa hlobo le ho eketsa botenya ba lerako;
4.Mehlala e tloaelehileng ea pompo ea mochine oa tiiso ke: M7N, M74 le M37G-G92 letoto, leo motho a lokelang ho le sebelisa ho itšetlehile ka moralo oa pompo, lisebelisoa tse tloaelehileng tsa tiiso ea mechine: e thata / e bonolo (tungsten carbide / graphite);ha khatello ea ho kena e le ≥0.8MPa, Ho tlameha ho khethoa tiiso e leka-lekaneng ea mochini;
5. Ho khothaletsoa hore mocheso o mahareng oa pompo e monyang habeli ha oa lokela ho feta 120 ° C.Ha 100 ° C ≤ mocheso o bohareng ≤ 120 ° C, pompo e tloaelehileng e hloka ho lokisoa: sekoti sa ho tiisa le karolo ea ho beleha e tlameha ho hlomelloa ka metsi a pholileng ka ntle ho sebaka se pholileng;li-rings tsohle tsa O tsa pompo li entsoe ka Ka bobeli li sebelisoa: rabara ea fluorine (ho kenyeletsoa le tiiso ea mochini).
Nako ea poso: May-10-2023