Ekukhetheni amaphampu amanzi, uma ukukhethwa kungalungile, izindleko zingase zibe phezulu noma ukusebenza kwangempela kwepompo kungase kungahlangabezani nezidingo zesayithi. Manje nikeza isibonelo ukukhombisa izimiso ezithile okufanele zilandelwe iphampu yamanzi.
Ukukhethwa kwepompo yokudonsa kabili kufanele kunake amaphuzu alandelayo:
1. Isivinini:
Isivinini esijwayelekile sinqunywa ngokwezidingo ezinikeziwe zekhasimende. Ijubane eliphansi lephampu efanayo, izinga lokugeleza elihambisanayo kanye nokuphakamisa kuzokwehla. Lapho ukhetha imodeli, kubalulekile ukucabangela hhayi kuphela ukusebenza komnotho, kodwa futhi nezimo zesayithi, njengokuthi: i-viscosity ye-medium, ukumelana nokugqoka, ikhono lokuzibamba, izici zokudlidliza, njll.
2. Ukunqunywa kwe-NPSH:
I-NPSH inganqunywa ngokwenani elinikezwe ikhasimende, noma ngokuya ngezimo zokungena zephampu, izinga lokushisa eliphakathi nendawo kanye nokucindezela komkhathi okusendaweni:
Ukubalwa kobude bokufakwa kwephampu yamanzi (i-algorithm elula: ngokuya ngomfutho womoya ojwayelekile kanye namanzi okushisa ajwayelekile) imi kanje:
Phakathi kwazo: i-hg—ubude bokufakwa kwejometri (inani elihle liwukudonsa, inani elingalungile liwukugeleza okuhlanekezelwe);
-Ikhanda lamanzi omfutho womkhathi endaweni yokufaka (ibalwa njengo-10.33m ngaphansi komfutho womoya ojwayelekile kanye namanzi acwebile);
i-hc-ukumunca ukulahlekelwa kwe-hydraulic; (uma ipayipi lokungena lilifushane futhi lingelula, ngokuvamile libalwa njengo-0.5m)
-Ikhanda lokucindezela kwe-vaporization; (amanzi ahlanzekile ekamelweni lokushisa abalwa njengo-0.24m)
- I-NPSH evumelekile; (ukuqinisekisa ukuphepha, ukubala ngokuya nge-NPSHr×1.2, NPSHr bona ikhathalogi)
Isibonelo, i-NPSH NPSHr=4m: Bese: hg=10.33-0.5-0.24-(4×1.2)=4.79 m (umphumela wokukhokha uyinani eliphozithivu, kusho ukuthi ingancela kufikela ku-≤4.79m, okungukuthi , izinga lokungena kwamanzi lingaba ku-impeller Ngaphakathi kuka-4.79m ngaphansi komugqa ophakathi nendawo uma ingaphansi kwengcindezi engalungile, kufanele ibe kuthelwe emuva, futhi inani lokuthululelwa emuva kufanele libe likhulu kunenani elibaliwe, okungukuthi, izinga lokungena kwamanzi lingaba ngaphezu kwenani elibaliwe ngaphezu komugqa omaphakathi we-impeller).
Okungenhla kubalwa ngaphansi kwesimo sokushisa okuvamile, amanzi ahlanzekile nokuphakama okuvamile. Uma izinga lokushisa, ukuminyana nokuphakama kwe-medium kungavamile, ukuze kugwenywe i-cavitation nezinye izinkinga ezithinta ukusebenza okuvamile kwesethi yepompo, amanani ahambisanayo kufanele akhethwe futhi afakwe esikhundleni sefomula yokubala. Phakathi kwazo, izinga lokushisa kanye nokuminyana kwe-medium kubalwa ngokwamanani ahambisanayo kokuthi "Vaporization Pressure and Density of Water at Different Temperatures", futhi ukuphakama kubalwa ngokwamanani ahambisanayo "ku-Altitude and Atmospheric Pressure of Major Cities in we bafowethu". Enye i-NPSH evumelekile iwukuqinisekisa ukuphepha, ngokusho kwe-NPSHr×1.4 (leli nani okungenani lingu-1.4).
3. Lapho ukucindezela kwe-inlet yepompo evamile kungu-≤0.2MPa, lapho ukucindezela kwe-inlet + ikhanda × izikhathi ezingu-1.5 ≤ ukucindezela kokucindezela, khetha ngokusho kwezinto ezivamile;
Ingcindezi yokungena + ikhanda × izikhathi ezingu-1.5 > ukucindezela kokucindezela, izinto ezijwayelekile ezihlangabezana nezidingo kufanele zisetshenziswe; uma ingcindezi yokungena iphezulu kakhulu noma ingcindezi yokuhlola iphezulu kakhulu, njll. ezingahlangabezani nezidingo, sicela uqinisekise ngobuchwepheshe bokushintsha izinto noma ukulungisa isikhunta futhi ukwandise ukushuba kodonga;
I-4.Amamodeli we-conventional pump mechanical seal yilawa: I-M7N, M74 kanye ne-M37G-G92 uchungechunge, okumele lusetshenziswe kuncike ekwakhiweni kwepompo, impahla evamile yophawu lomshini: i-hard/soft (i-tungsten carbide/graphite); lapho ingcindezi yokungena ingu-≥0.8MPa, kufanele kukhethwe uphawu lomshini olinganiselayo;
5. Kunconywa ukuthi izinga lokushisa eliphakathi nendawo lephampu yokumunca kabili akufanele lidlule ku-120°C. Lapho i-100 ° C ≤ izinga lokushisa eliphakathi ≤ 120 ° C, ipompo evamile idinga ukulungiswa: imbobo yokuvala kanye nengxenye yokuthwala kufanele ifakwe amanzi okupholisa ngaphandle kwendawo yokupholisa; wonke ama-O-rings wepompo akhiwe Kokubili ukusetshenziswa: irabha ye-fluorine (kuhlanganise nomshini wokufaka uphawu).
Isikhathi sokuthumela: May-10-2023