Lub impeller yog ib qho khoom siv hluav taws xob uas hloov hluav taws xob los ntawm kev sib hloov. Nws lub hauv paus ntsiab lus tseem ceeb yog siv lub centrifugal lossis axial quab yuam tsim thaum lub sij hawm tig los ua haujlwm ntawm cov kua (kua lossis roj). Yog xav paub ntxiv txog cov khoom no, thov tso koj cov ntaub ntawv tiv tauj, thiab peb yuav teb sai li sai tau.
Thaum lub impeller tig ntawm kev kub ceev, cov kua dej yog tsav los ntawm cov hniav thiab nrawm los ntawm qhov chaw mus rau sab nrauv nyob rau hauv lub zog centrifugal (centrifugal impeller), los yog thawb axially (axial flow impeller), yog li ua tiav lub zog, kev xa khoom, lossis kev sib xyaw ua haujlwm. Nws txoj hauv kev ua haujlwm tuaj yeem muab faib ua ntau yam hauv qab no:
Fluid Dynamics Txoj Cai
Centrifugal Impeller: Ua raws li Bernoulli qhov sib npaug; Cov kua dej kinetic zog thiab lub zog siab yog sib hloov dua siab tshiab, thiab lub qhov hluav taws xob siab yog qhov siab dua qhov siab ntawm qhov nkag.
Axial Flow Impeller: tso siab rau ntawm lub kaum sab xis ntawm kev tawm tsam los tsim kev nqa, txav cov kua dej sib npaug mus rau axis. Feem ntau siv hauv siab -flow- cov ntawv thov.
Lub zog hloov Efficiency
Hniav tsim (xws li, rov qab- nkhaus, pem hauv ntej- nkhaus) cuam tshuam ncaj qha rau kev ua haujlwm. Rov qab- cov hniav nkhaus feem ntau ua tau zoo dua (txog 85% lossis ntau dua), tab sis rau pem hauv ntej- cov hniav nkhaus tuaj yeem muab lub taub hau loj dua.
Cov zis hluav taws xob yog ncaj qha proportional rau lub square ntawm txoj kab uas hla. Hom kev lag luam impeller nrawm ntawm 1000-3000 rpm.
Key Tsim Parameters
Tshwj xeeb ceev (Ns) txiav txim siab hom impeller xaiv. Tsawg ceev ceev (<50) are suitable for centrifugal impellers, while high specific speeds (>200) xav tau axial impellers.
Tus naj npawb ntawm cov hniav yog feem ntau 5-12. Muaj ntau cov hniav tuaj yeem ua rau cov dej ntws ntws tawm, thaum tsawg dhau tuaj yeem txo lub zog hloov pauv tsis sib xws.
Daim ntawv thov Scenario sib txawv
Centrifugal impellers: twj tso kua mis, compressors, turbochargers, haum rau nruab nrab mus rau siab siab daim ntaub ntawv (xws li, industrial twj nrog siab txog li 10 MPa).
Axial impellers: Ntxuam, marine propulsion, haum rau qhov tsis tshua muaj siab thiab siab ntws (piv txwv li, fais fab nroj tsuag txias yees nrog txaus tus nqi siab tshaj 10000 m³ / h).
Khoom thiab txheej txheem yuav tsum tau
Kev tiv thaiv rau cavitation (xws li, 316L stainless hlau) los yog corrosion (Hastelloy alloy) yuav tsum tau. Rau siab - kev siv zog, titanium alloys lossis ceramic txheej yog siv.
Precision casting lossis tsib -axis milling ua kom cov hniav profile yuam kev<0.1mm, and dynamic balance grade must reach G6.3 (ISO 1940 standard).
Kev xav txog qhov system
Lub volute lossis qhia vane yuav tsum tau hloov lub zog kinetic rau hauv hydrostatic siab; lub inlet rectifier tuaj yeem tiv thaiv eddy tam sim no.
Cov chav txias txias (xws li cov channel sab hauv hauv cov roj turbine hniav) yuav tsum muaj rau kev ua haujlwm kub -; replaceable coj rings yuav muab ntxiv rau abrasive ib puag ncig.