Muaj ob qhov kev faib tawm ntawm cov kiv cua: lub kiv cua lossis axial flow fan thiab centrifugal lossis radial flow fan. Hauv kev txiav txim siab dav dav, dab tsi ua rau lawv sib cais yog li cas huab cua dhau los ntawm lub impeller. Lub kiv cua los yog axial flow fan propels huab cua nyob rau hauv ib qho kev taw qhia axial (Daim duab 1a) nrog ib tug swirling tangential motion tsim los ntawm cov rotating impeller hniav.
Nyob rau hauv ib lub kiv cua centrifugal, huab cua nkag mus rau hauv lub impeller axially thiab nrawm los ntawm cov hniav thiab tawm radially (Daim duab 1b). Ib qho tshwj xeeb rau qhov no yog tangential/transverse kiv cua uas cov cua nkag mus thiab tawm radially los ntawm lub impeller.
Lub kiv cua axial ntws nce cua nrawm los ntawm kev sib hloov lossis tangential quab yuam uas ua rau lub siab tshaj plaws (VP), lub zog kinetic, nrog qhov nce me me hauv qhov siab zoo li qub (SP), lub zog muaj peev xwm.
Lub centrifugal ntxuam induces airflow los ntawm lub centrifugal quab yuam generated nyob rau hauv ib tug rotating kem ntawm huab cua tsim muaj peev xwm zog (SP) thiab kuj los ntawm lub rotational (tangential) tshaj tawm imparted rau saum huab cua raws li nws tawm hauv lub ntsis ntawm cov hniav ua kinetic zog (VP).
Daim duab 2 qhia txog cov khoom uas ua rau cov kiv cua centrifugal thiab npog cov ntsiab lus ntawm cov khoom siv no.
Hom log
Cov kiv cua centrifugal tuaj yeem muab faib ua peb hom yooj yim raws li cov hniav teeb tsa:
1. Forward nkhaus
2. Rov qab inclined
3. Radial lossis ncaj hniav
Txhua hom muaj nws tus kheej daim ntawv thov ntau yam thiab txwv. Kev hloov kho ntawm cov hom yooj yim no suav nrog radial tip, mixed flow, thiab tangential flow.
Lub ntsis ceev yuav tsum tau tsim cov cua particle tshaj tawm qhov yuav tsum tau sib txawv nrog rau hom hniav siv. Daim duab 3a, 3b, thiab 3c (Daim duab 3) qhia cov duab kos duab ntawm lub zog hauv pem hauv ntej nkhaus, rov qab nkhaus, thiab radial blade impellers, feem. Vector V1sawv cev rau rotational lossis tangential tshaj tawm, thiab V2sawv cev rau radial tshaj tawm ntawm airflow ntawm cov hniav nrog kev hwm rau ntau yam hniav duab.
Vector R sawv cev rau qhov tshwm sim nrawm rau txhua yam ntawm cov hniav no. Nco ntsoov tias R rau pem hauv ntej nkhaus impeller yog qhov loj tshaj plaws nrog rov qab inclined impeller qhov tsawg tshaj plaws, thaum lub kiv cua radial nyob rau qhov chaw nyob nruab nrab. Qhov kev sib raug zoo no yog qhov zoo tshaj plaws piav qhia hauv daim duab 4, uas qhia tau hais tias ib qho kev sib tw ceev / zoo li qub kev sib raug zoo rau ntau hom centrifugal kiv cua.
Forward Curve Ntxuam
Cov kiv cua no qee zaum hu ua "ntim," "squirrel tawb," lossis "sirocco" blowers. Lub impeller hniav yog me me thiab ntau nrog ib tug pronounced curvature thiab luv chord ntev. Lub concave hniav curvature ntsib cov kev taw qhia ntawm kev sib hloov. Cov kiv cua no ua haujlwm ntawm qhov qis qis thiab qhov siab (siv daim duab 4) uas tso cai rau lub teeb tsim ntawm lub impeller, ncej, bearings, thiab vaj tse.
Backward Inclined Kiv cua
Cov no qee zaum hu ua "load limiting" lossis "non{0}}overloading" kiv cua. Lub impeller hniav yog loj dua thiab hnyav dua rau pem hauv ntej nkhaus hniav, feem ntau yog los ntawm yim mus rau
kaum ob, thiab inclined deb ntawm cov kev taw qhia ntawm kev sib hloov. Lawv yog standardly muaj nyob rau hauv peb cov duab puab:
1. Ib leeg tuab tuab (Daim duab 6a)
2. Curved ib thickness (Daim duab 6b)
3. Curved airfoil (Daim duab 6c)
Radial Hniav Fans
"Steel phaj" lossis "paddle wheel" yog ob lub npe rau cov kiv cua radial. Lub impeller hniav feem ntau nqaim, ntxaum thiab hnyav dua rau pem hauv ntej nkhaus thiab rov qab inclined hniav. Ib qho radial blade impeller feem ntau muaj rau txog rau kaum ob qhov sib npaug sib npaug ntawm cov hniav tiaj tus uas nthuav tawm radially los ntawm qhov chaw ntawm lub hub. Cov impellers no feem ntau yog cov qauv tsim yooj yim uas qiv nws tus kheej rau kev tsim kho rugged thiab muaj qhov tsawg kawg nkaus ntawm cov ledges, thiab lwm yam, rau cov khoom sib txuam ntawm cov plua plav lossis cov khoom nplaum.
Muaj ntau qhov hloov pauv ntawm cov kiv cua radial hniav ntau dua li qhov nkhaus rau pem hauv ntej thiab rov qab inclined hom. Peb ntawm cov impellers feem ntau yog qhia hauv daim duab 8.
