Lub metering twj tso kua mis yog ib hom twj tso kua mis zoo uas tsim los kom meej thiab meej tswj tus nqi ntawm cov kua. Nws ua tiav qhov no los ntawm kev tshem tawm cov ntim tas li ntawm cov kua nrog txhua qhov mob stroke lossis kev sib hloov ntawm nws cov khoom sab hauv. Ntawm no yog li cas lub twj tso kua mis metering ua haujlwm:
1.Liquid Chamber: Metering twj tso kua mis muaj cov kua chamber qhov twg cov kua yuav tsum tau dosed. Lub chamber no feem ntau kaw thiab cais tawm ntawm ib puag ncig sab nraud kom tiv thaiv kom tsis txhob xau.
2. Kev tshem tawm tshuab: Metering twj siv ntau yam kev hloov pauv, nyob ntawm seb lawv hom. Qee cov txheej txheem muaj xws li diaphragms, pistons, peristaltic rollers, lossis iav mechanisms. Qhov kev xaiv ntawm lub tshuab cuam tshuam rau qhov tseeb thiab qhov tsim nyog ntawm lub twj tso kua mis rau kev siv tshwj xeeb.
- Diaphragm Pumps: Cov twj no siv lub diaphragm hloov tau los tsim lub chamber sib txawv. Raws li lub diaphragm flexes, nws hloov pauv nce thiab txo qhov ntim ntawm lub chamber, ua rau cov kua tau kos rau hauv thiab thawb tawm nrog txhua lub voj voog.
- Piston Pumps: Piston metering twj siv lub piston reciprocating los kos rau hauv thiab tawm cov kua. Lub piston lub zog tswj qhov ntim ntawm cov kua txav mus rau ib qho mob stroke.
- Peristaltic Pumps: Peristaltic metering twj siv cov chais los nyem lub raj hloov tau yooj yim lossis hose. Raws li cov rollers txav mus rau hauv lub raj, lawv tsim ib qho "peristaltic" kev ua uas thawb cov kua los ntawm lub raj ntawm tus nqi tswj.
- Gear Pumps: Gear metering twj siv cov iav rotating nrog meej clearances txav cov kua los ntawm sab inlet mus rau sab qhov hluav taws xob. Lub iav qhov kev sib hloov tswj qhov ntim ntawm cov kua dispensed ib kiv puag ncig.
3.Valves: Feem ntau cov twj ntsuas ntsuas suav nrog ib-txoj kev kuaj li qub (inlet thiab qhov hluav taws xob li qub) txhawm rau xyuas kom meej tias cov kua ntws tawm yog unidirectional. Cov li qub no tiv thaiv kev thim rov qab thiab tswj kev ncaj ncees ntawm cov txheej txheem dosing.
4. Tsav Mechanism: Lub cev muaj zog lossis tsav lub cev muaj zog ua rau lub tshuab txav chaw. Lub cev muaj zog txav los yog kev sib hloov yog tswj tau meej, kom ntseeg tau tias lub twj tso kua mis ua haujlwm ntawm qhov xav tau txaus thiab qhov tseeb npaum li cas.
5.Control System: Metering twj feem ntau muaj kev tswj xyuas uas tso cai rau cov neeg siv los teeb tsa thiab kho qhov xav tau ntawm tus nqi ntws. Qhov kev tswj no tuaj yeem ua tau phau ntawv los yog automated, nyob ntawm lub twj tso kua mis sophistication thiab daim ntawv thov cov cai.
6.Txoj nyem nyem los yog Bypass: Qee cov twj ntsuas ntsuas tau siv lub siab nyem los yog bypass mechanism los tiv thaiv kev kub siab tshaj. Yog tias lub kaw lus ntsib qhov siab dua li qhov xav tau, cov kua dej ntau dhau tuaj yeem raug coj rov qab mus rau cov kua chamber lossis rov ua dua.
Nyob rau hauv cov ntsiab lus, metering twj ua hauj lwm los ntawm displaces ib tug meej, predetermined ntim ntawm cov kua nrog txhua stroke los yog kev sib hloov ntawm lawv internal mechanisms. Lawv cov qauv tsim thiab kev tswj hwm tso cai rau kev siv cov kua dej kom raug thiab sib npaug, ua rau lawv qhov tseem ceeb hauv cov ntawv thov uas muaj kev tswj xyuas qhov tseeb yog qhov tseem ceeb.
