Qhov txawv ntawm NPT thiab FIP yog dab tsi?
Taw qhia:
NPT thiab FIP yog ob feem ntau siv cov lus hauv ntau qhov chaw, tshwj xeeb hauv kev tsim khoom thiab kev lag luam engineering. Txawm hais tias lawv yuav suab zoo sib xws, lawv muaj cov ntsiab lus sib txawv thiab lub hom phiaj. Hauv tsab xov xwm no, peb yuav qhia txog cov ntsiab lus ntawm NPT thiab FIP, qhia txog lawv qhov sib txawv thiab muab kev nkag siab zoo ntawm cov ntsiab lus no.
NPT (National Pipe Xov):
NPT stands rau National Pipe Thread, uas yog US tus qauv rau tapered threads siv rau ntau yam kav dej thiab fittings. Lub hom phiaj tseem ceeb ntawm NPT yog los muab lub foob tsis pub muaj kev sib khi ntawm cov txiv neej thiab poj niam cov khoom hauv cov yeeb nkab. NPT threads muaj ib tug taper ntawm 1:16, txhais tau hais tias txoj kab uas hla ntawm cov xov txo los ntawm 1 unit nyob rau txhua txhua 16 units ntawm qhov ntev.
Cov yam ntxwv ntawm NPT:
1. Tapered Threads: Ib qho ntawm cov yam ntxwv tseem ceeb ntawm NPT yog nws cov xov tapered. Qhov kev tsim no tso cai rau kev sib txuas nruj dua thiab ruaj ntseg ntawm cov yeeb nkab fittings.
2. Thread Angle: NPT threads muaj 60-degree xov lub kaum sab xis, uas ua kom muaj kev sib koom ua ke ntawm cov txiv neej thiab poj niam.
3. Yuav tsum tau sealant: NPT threads yuav tsum tau siv lub sealant, xws li Teflon daim kab xev los yog cov yeeb nkab dope, kom ntseeg tau tias muaj kev ruaj ntseg thiab tsis muaj kev sib txuas.
4. Kev siv ntau: NPT threads feem ntau yog siv rau hauv cov kav dej, hydraulic systems, thiab lwm yam kev siv uas lub foob kaw ntom nti yog qhov tseem ceeb.
FIP ( Poj Niam Hlau Yeeb ) lossis MIP ( Txiv Neej Hlau Yeeb ):
FIP, tseem hu ua Poj Niam Hlau Yeeb Nkab lossis MIP, Txiv Neej Hlau Yeeb Nkab, hais txog poj niam txiv neej ntawm qhov haum es tsis yog cov xov hom nws tus kheej. Nws yog lub npe siv los txheeb xyuas seb qhov haum yog poj niam lossis txiv neej. Lo lus FIP feem ntau siv nrog NPT thaum tham txog cov yeeb nkab fittings.
Cov yam ntxwv ntawm FIP:
1. Kev Qhia Txog Poj Niam Txiv Neej: FIP ua haujlwm raws li kev qhia txog poj niam txiv neej rau poj niam cov yeeb nkab fittings. Nws qhia tau hais tias qhov haum muaj cov xov sab hauv kom tau txais ib tug txiv neej yeeb nkab los yog haum.
2. Kev sib txuas kev sib raug zoo: FIP fittings yog sib xws nrog txiv neej threaded fittings, tsis hais seb lawv yog NPT lossis lwm hom threaded.
3. Khoom siv: FIP fittings feem ntau yog ua los ntawm hlau lossis tooj dag, muab lub zog thiab ua haujlwm ntev rau cov yeeb nkab.
4. Kev siv ntau: FIP fittings yog siv dav hauv cov kav dej, tshwj xeeb tshaj yog rau kev sib txuas ntau yam yeeb nkab ntu lossis txuas cov khoom sib txuas uas yuav tsum tau muaj kev sib txuas ntawm poj niam.
Qhov sib txawv ntawm NPT thiab FIP:
1. Xov Tsim: Qhov sib txawv ntawm NPT thiab FIP yog cov xov tsim. NPT yog hais txog cov xov tshwj xeeb nrog cov xov tapered thiab ib lub kaum 60-degree, thaum FIP sawv cev rau poj niam txiv neej ntawm qhov haum.
2. Lub Hom Phiaj: NPT tsom mus rau cov xov tsim kom ua tiav qhov kev sib txuas tsis muaj qhov tsis muaj dej thiab ruaj ntseg, qhov FIP qhia txog poj niam txiv neej ntawm qhov haum rau kev sib raug zoo nrog lwm cov fittings.
3. Daim ntawv thov kom pom tseeb: NPT threads feem ntau yog siv rau hauv cov kav dej thiab fittings, kom muaj kev sib khi nruj, thaum FIP fittings yog siv los txuas ntau ntu ntawm cov kav dej lossis cov khoom sib txuas uas yuav tsum muaj kev sib txuas ntawm poj niam.
4. Scope: NPT yog lub ntsiab lus dav uas suav nrog ntau hom xov, suav nrog NPTF (National Pipe Thread Fuel), NPSC (National Pipe Straight Coupling), thiab NPSL (National Pipe Straight Locknut). Ntawm qhov tod tes, FIP tshwj xeeb yog hais txog kev sib txuas poj niam.
Xaus:
Hauv kev xaus, NPT thiab FIP yog ob lo lus sib txawv siv nyob rau hauv cov ntsiab lus ntawm cov yeeb nkab fittings. NPT qhia txog cov xov tsim siv los ua kom tiav qhov tsis muaj qhov sib khi, thaum FIP qhia txog poj niam txiv neej ntawm qhov haum kom ntseeg tau tias muaj kev sib raug zoo nrog lwm yam khoom siv. Kev nkag siab qhov sib txawv ntawm cov ntsiab lus no yog qhov tseem ceeb rau kev xaiv cov fittings uas tsim nyog thiab ua kom muaj kev txhim kho cov yeeb nkab zoo. Txawm hais tias nws yog cov xov tapered ntawm NPT lossis kev qhia txog poj niam txiv neej ntawm FIP, ob qho tib si ua lub luag haujlwm tseem ceeb hauv kev tswj hwm kev ncaj ncees thiab kev ua haujlwm ntawm ntau yam yeeb nkab.