Chiyambi cha mawu a pampu wamba (1) - kuchuluka kwa kuthamanga + zitsanzo

1.Kuyenda-Amatanthawuza kuchuluka kapena kulemera kwa madzi omwe amaperekedwa ndipompa madziPa nthawi ya unit. Zofotokozedwa ndi Q, mayunitsi omwe amagwiritsidwa ntchito kawirikawiri ndi m3/h, m3/s kapena L/s, t/h.

2.Mutu-Imatanthawuza mphamvu yowonjezereka yonyamula madzi ndi mphamvu yokoka kuchokera kumalo olowera kupita ku pompu yamadzi, ndiko kuti, mphamvu yomwe imapezeka madzi omwe ali ndi mphamvu yokoka amadutsa pampopi yamadzi. Pofotokozedwa ndi h, unit ndi Nm/N, yomwe nthawi zambiri imawonetsedwa ndi kutalika kwa gawo lamadzimadzi pomwe madzi amapopa; Umisiri nthawi zina umawonetsedwa ndi kukakamizidwa kwa mumlengalenga, ndipo gawo lazamalamulo ndi kPa kapena MPa.

 (Zolemba: Unit: m/p = ndi)

Malinga ndi tanthauzo:

H=E_d-E_s

E_d- Mphamvu pa unit kulemera kwa madzi pa kotuluka flange wapompa madzi;

Es-Energy pa unit kulemera kwa madzi pa inlet flange ya mpope madzi.

E_d=Z _d + P _d/ ρg + V²_d / 2g

E_s=Z _s+ P_s / ρg+V²_s / 2g

Kawirikawiri, mutu pa dzina la mpope uyenera kukhala ndi magawo awiri otsatirawa. Mbali imodzi ndi kutalika kwa mutu woyezeka, ndiko kuti, kutalika koyima kuchokera pamwamba pa madzi a dziwe lolowera mpaka pamadzi a dziwe lotulukira. Wodziwika kuti mutu weniweni, mbali yake ndi kutayika kwa kukana panjira pamene madzi akudutsa paipi, kotero posankha mutu wa mpope, uyenera kukhala chiŵerengero cha mutu weniweni ndi kutaya mutu, ndiko kuti:

Chitsanzo cha kuwerengera mutu wa pampu

Ngati mukufuna kupereka madzi ku nyumba yokwera kwambiri, tiyerekeze kuti madzi apompopompo ndi 50m.³/ h, ndi kutalika kolunjika kuchokera pamwamba pa madzi a dziwe lolowera kumtunda wapamwamba kwambiri wamadzi ndi 54m, kutalika kwa payipi yoperekera madzi ndi 150m, m'mimba mwake ndi Ф80mm, ndi valavu imodzi pansi, valavu imodzi yachipata ndi valavu imodzi yosabwerera, ndi eyiti 900 imapindika ndi r / d = z, mutu wapampu ndi waukulu bwanji kuti ukwaniritse zofunikira?

Yankho:

Kuchokera pachiwonetsero pamwambapa, tikudziwa kuti mutu wapampu ndi:

H =H_zenizeni +H _kutaya

Kumene: H ndiye kutalika koyimirira kuchokera pamwamba pa madzi a thanki yolowera mpaka pamlingo wapamwamba kwambiri wamadzi, ndiko kuti: H_zenizeni= 54m

H_kutayandi mitundu yonse ya zotayika mu payipi, zomwe zimawerengedwa motere:

Mapaipi odziwika bwino amakoka ndi ngalande, ma elbows, mavavu, mavavu osabwerera, mavavu apansi ndi ma diameter ena a chitoliro ndi 80mm, kotero malo ake odutsa ndi:

Pamene mlingo wothamanga ndi 50 m³/h (0.0139 m³/s), kuchuluka kwapakati kofananira ndi:

The kukana imfa pamodzi m'mimba mwake H, malinga ndi deta, pamene madzi otaya mlingo ndi 2.76 m/s, imfa ya 100-mita pang'ono dzimbiri chitoliro zitsulo ndi 13.1 m, ndicho kufunika kwa ntchito imeneyi madzi.

Kutayika kwa chitoliro chokhetsa, chigongono, valavu, valavu yoyendera ndi valavu yapansi ndi2.65m.

Kuthamanga mutu pakutulutsa madzi kuchokera ku nozzle:

Choncho, mutu wonse H wa mpope ndi

H _mutu= H _zenizeni + H _{kutaya kwathunthu}=54+19.65+2.65+0.388 = 76.692 (m)

Posankha madzi okwera kwambiri, pampu yamadzi yotulutsa madzi osachepera 50m³/ h ndi mutu wosachepera 77 (m) ayenera kusankhidwa.