Common throttling devices rau cov khoom siv tub yees
Cov cuab yeej throttling yog ib qho tseem ceeb ntawm lub tshuab tub yees. Nws muaj nuj nqi yog depressurize cov kua saturated (los yog subcooled kua) nyob rau hauv lub condensing siab nyob rau hauv lub condenser los yog kua receiver mus rau lub evaporation siab thiab evaporation kub tom qab throttling. Txhawm rau kom ua tiav lub hom phiaj ntawm kev ua kom txias thiab txias, kho qhov ntws ntawm cov tub yees nkag mus rau hauv lub evaporator kom hloov mus rau qhov hloov pauv ntawm cov evaporator. Common throttling mechanisms yog raws li nram no.
1. Capillary
Lub raj capillary yog qhov yooj yim tshaj plaws throttling ntaus ntawv. Vim lub aperture me me, thaum cov kua dej ntws los ntawm lub raj tooj liab, nws yuav tsum tau kov yeej qhov kev tawm tsam hauv cov kav dej, uas ua rau muaj qee qhov kev poob siab. Txoj kab uas hla ntawm lub raj txo qis, thiab qhov ntev ntawm lub raj ntev, lub siab poob ntau dua. loj. Qhov zoo dua yog tias nws muaj cov qauv yooj yim thiab tsis muaj qhov txav txav, thaum qhov tsis zoo yog tias nws tsis muaj peev xwm hloov kho thiab tsis zoo rau kev ua haujlwm. Feem ntau siv rau hauv qee cov khoom siv me me uas tsis muaj nqi, xws li cua txias, tub yees thiab lwm yam.
2. Orifice throttling
Rau cov khoom siv loj loj nrog lub peev xwm txias txias, xws li cov centrifugal chillers, cov khoom siv tub yees yog qhov loj, yog li lub raj capillary yog pom tseeb tsis txaus. Thaum lub siab sib txawv ntawm lub hauv ntej thiab nram qab ntawm lub raj xa dej loj, txoj kev ua kom lub throttling orifice feem ntau siv. Lub hauv paus ntsiab lus yog: kua dej Thaum ntws hauv cov raj xa dej, vim yog lub hauv paus tsis kam ntawm lub phaj phaj, lub siab ntawm cov kua yog txo thiab lub zog poob. Qhov no tshwm sim yog thermodynamically hu ua throttling phenomenon. Txoj kev no yooj yim dua li kev siv lub valve tswj, tab sis nws yuav tsum tau xaiv kom zoo, txwv tsis pub, cov kua yog nquag mus cavitation, uas cuam tshuam rau kev nyab xeeb ntawm cov kav dej.
Common throttling mechanism ntawm cov khoom siv tub yees
Lub luag haujlwm ntawm lub throttling orifice yog txo qhov aperture ntawm qhov chaw tsim nyog hauv cov kav dej. Thaum cov kua dhau los ntawm qhov constriction, lub ntws beam yuav ua thinner los yog cog lus. Qhov tsawg tshaj plaws cross-section ntawm cov kwj deg zoo nkaus li downstream ntawm qhov tseeb constriction thiab hu ua systolic cross-section. Nyob rau hauv lub systolic flow seem, qhov khiav ceev yog qhov loj tshaj plaws, thiab qhov nce ntawm qhov khiav ceev yog nrog los ntawm ib tug loj txo nyob rau hauv lub siab ntawm lub systolic flow seem.
3. Thermal expansion valve
Lub thermal expansion valve siv qhov ntsuas kub kom paub qhov superheat degree ntawm cov tub yees. Thaum lub superheat degree siab, nws txhais tau hais tias cov evaporation txaus, lub tub yees tau dhau los ua lub xeev gaseous, thiab tseem muaj overheating. Lub sijhawm no, lub siab nyob rau hauv lub diaphragm kab noj hniav nce. Tom qab ntawd thawb lub valve qia downward, thiab thaum kawg ua kom lub valve qhib. Yog hais tias lub superheat tsawg, nws txhais tau hais tias cov evaporation tsis txaus. Lub sijhawm no, lub siab nyob rau hauv lub diaphragm kab noj hniav yog txo, thiab lub diaphragm thawb lub valve lub cev mus rau pem hauv ntej, yog li txo lub valve qhib. Los ntawm cov txheej txheem saum toj no, kev tswj cov dej ntws thiab kev poob siab yog thaum kawg paub.
4. Electronic expansion valve
Piv nrog rau lub thermal expansion valve, lub tshuab hluav taws xob nthuav dav siv lub tshuab hluav taws xob stepper rau kev hloov pauv, thiab nws lub hom phiaj tswj tau yog qib superheat lossis qib kua ntawm cov evaporator lossis condenser. Rau lub thermal expansion valve, vim lub thermal inertia ntawm qhov kub thiab txias sensor nws tus kheej, uas yog, high degree ntawm superheat ntawm lub qhov hluav taws xob tsis tuaj yeem ua rau lub lag luam ntawm lub expansion valve tam sim ntawd, yog li kev ua haujlwm ntev. Lub tshuab hluav taws xob nthuav dav tuaj yeem ua raws li lub sijhawm ntsuas lub sijhawm ntawm cov kua dej lossis tso pa tawm superheat, thiab tam sim ntawd tom qab tus tswj tau suav, tsis muaj kev ncua sijhawm, thiab kev hloov kho tau zoo.
Common throttling mechanism ntawm cov khoom siv tub yees
5. Floating pob throttle valve
Rau cov evaporators nrog cov kua dej dawb, xws li kab rov tav plhaub thiab raj evaporator, ntsug raj lossis kauv raj evaporator, tsis siv neeg hloov cov kua dej. Los ntawm txoj kev tswj hwm kev tswj hwm ntawm ntab regulating valve, qib ua kua tsis tu ncua tuaj yeem khaws cia hauv cov khoom siv no. Nyob rau tib lub sijhawm, ntab regulating valve muaj kev ua haujlwm ntawm throttling thiab txo qhov siab. Nws tuaj yeem muab faib ua ob hom: ncaj-dhau thiab tsis ncaj-dhau. Qhov ncaj-los ntawm ntab pob tswj valve muaj cov qauv yooj yim, tab sis vim muaj kev cuam tshuam ntawm cov kua, cov kua theem hauv lub plhaub hloov pauv tau zoo heev, uas ua rau kev ua haujlwm ntawm cov tswj valve tsis ruaj khov, thiab cov kua ntws los ntawm lub plhaub mus rau hauv. lub evaporator, nyob ntawm qhov siab ntawm cov kab ke hydrostatic. pluag, yog li cov kua tsuas tuaj yeem muab tau qis dua cov kua theem ntawm lub thawv.
Qhov tsis ncaj-los ntawm ntab tswj valve ua haujlwm ruaj khov, thiab tuaj yeem muab cov kua rau txhua qhov ntawm cov evaporator.
