Valve sealing txoj cai

Muaj ntau ntau hom li qub, tab sis lawv cov kev ua haujlwm yooj yim yog tib yam, uas yog kev sib txuas lossis txiav tawm ntawm qhov ntws tawm. Yog li ntawd, qhov teeb meem sealing ntawm li qub ua qhov tseem ceeb heev.

Txhawm rau kom ntseeg tau tias lub valve tuaj yeem txiav tawm qhov nruab nrab ntws zoo thiab tiv thaiv kom tsis txhob tawm, nws yog qhov tsim nyog los xyuas kom meej tias lub foob ntawm lub valve tsis zoo. Muaj ntau ntau yam vim li cas rau lub valve tawm, nrog rau cov qauv tsim tsis tsim nyog, qhov chaw sib txuas tsis zoo, cov khoom siv xoob xoob, xoob haum ntawm lub cev lub cev thiab lub valve npog, thiab lwm yam. Tag nrho cov teeb meem no yuav ua rau lub valve sealing tsis raug. Zoo, yog li tsim qhov teeb meem xau. Yog li ntawd,valve sealing tshuabyog ib qho tseem ceeb thev naus laus zis ntsig txog valve kev ua tau zoo thiab kev ua tau zoo, thiab yuav tsum muaj kev tshawb fawb txog kev sib raug zoo thiab qhov tob.

Txij li thaum tsim cov li qub, lawv cov tshuab sealing kuj muaj kev txhim kho zoo. Txog tam sim no, valve sealing thev naus laus zis feem ntau cuam tshuam rau ob qhov tseem ceeb, xws li kev sib khi zoo li qub thiab kev sib khi zoo.

Lub thiaj li hu ua static seal feem ntau yog hais txog lub foob ntawm ob qhov chaw zoo li qub. Txoj kev sealing ntawm static seal feem ntau yog siv gaskets.

Lub thiaj li hu ua dynamic foob feem ntau yog hais txogsealing ntawm lub valve qia, uas tiv thaiv qhov nruab nrab hauv lub valve los ntawm kev xau nrog kev txav ntawm lub valve qia. Txoj kev sealing tseem ceeb ntawm kev sib foob yog siv lub thawv ntim khoom.

1. Static foob

Static sealing yog hais txog kev tsim lub foob ntawm ob qhov chaw nyob ruaj khov, thiab txoj kev sib khi feem ntau yog siv cov gaskets. Muaj ntau hom tshuab ntxhua khaub ncaws. Cov tshuab ntxhua khaub ncaws uas nquag siv muaj xws li cov ntxhua khaub ncaws tiaj tus, O-shaped washers, qhwv cov ntxhua khaub ncaws, cov ntxhua khaub ncaws tshwj xeeb, cov ntxhua khaub ncaws thiab cov ntxhua khaub ncaws. Txhua hom tuaj yeem muab faib ntxiv raws li cov khoom siv sib txawv.
①Lub tshuab ntxhua khaub ncaws. Flat washers yog cov ntxhua khaub ncaws uas muab tso rau hauv nruab nrab ntawm ob qhov chaw nyob ruaj khov. Feem ntau, raws li cov ntaub ntawv siv, lawv tuaj yeem muab faib ua cov tshuab ntxhua khaub ncaws, cov tshuab ntxhua khaub ncaws, cov tshuab ntxhua khaub ncaws hlau thiab cov tshuab ntxhua khaub ncaws. Txhua yam khoom muaj nws tus kheej daim ntawv thov. ntau.
②O-ntiv nplhaib. O-ring yog hais txog lub gasket nrog O-shaped cross-section. Vim tias nws cov hlais yog O-zoo li tus, nws muaj qee qhov kev nruj ntawm tus kheej, yog li cov nyhuv sealing zoo dua li ntawm lub tiaj tus gasket.
③ suav nrog cov tshuab ntxhua khaub ncaws. Lub gasket qhwv yog hais txog lub gasket uas qhwv ib yam khoom ntawm lwm yam khoom. Xws li gasket feem ntau muaj elasticity zoo thiab tuaj yeem txhim kho cov nyhuv sealing. ④ Cov tshuab ntxhua khaub ncaws tshwj xeeb. Cov tshuab ntxhua khaub ncaws tshwj xeeb xa mus rau cov gaskets nrog cov duab tsis tu ncua, suav nrog cov tshuab ntxhua khaub ncaws, pob zeb diamond ntxhua khaub ncaws, iav hom ntxhua khaub ncaws, dovetail-type washers, thiab lwm yam. Cov tshuab ntxhua khaub ncaws no feem ntau muaj cov nyhuv nruj thiab feem ntau yog siv rau hauv siab thiab nruab nrab siab li qub. .
⑤Wave washer. Wave gaskets yog gaskets uas tsuas muaj yoj zoo li. Cov gaskets no feem ntau yog tsim los ntawm kev sib xyaw ntawm cov khoom siv hlau thiab cov khoom tsis yog hlau. Lawv feem ntau muaj cov yam ntxwv ntawm me me nias quab yuam thiab zoo sealing nyhuv.
⑥ Muab lub tshuab ntxhua khaub ncaws. Qhov txhab gaskets xa mus rau gaskets tsim los ntawm qhwv nyias hlau strips thiab non-metal strips nruj nreem ua ke. Hom gasket no muaj zoo elasticity thiab sealing zog. Cov khoom siv rau kev ua gaskets feem ntau suav nrog peb pawg, uas yog cov khoom siv hlau, cov khoom tsis yog xim hlau thiab cov khoom sib xyaw. Feem ntau hais lus, cov khoom siv hlau muaj lub zog siab thiab muaj zog kub tsis kam. Cov khoom siv hlau feem ntau muaj xws li tooj liab, txhuas, hlau, thiab lwm yam. Muaj ntau hom khoom siv tsis yog xim hlau, nrog rau cov khoom siv yas, cov khoom siv roj hmab, cov khoom siv asbestos, cov khoom hemp, thiab lwm yam. Cov ntaub ntawv tsis yog xim hlau yog dav siv thiab xaiv tau. raws li kev xav tau tshwj xeeb. Kuj tseem muaj ntau hom ntaub ntawv sib xyaw, suav nrog laminates, cov vaj huam sib luag sib xyaw, thiab lwm yam, uas kuj tau xaiv raws li cov kev xav tau tshwj xeeb. Feem ntau, corrugated washers thiab kauv lub qhov txhab ntxhua feem ntau yog siv.

2. Dynamic foob

Dynamic foob yog hais txog lub foob uas tiv thaiv qhov nruab nrab ntws hauv lub valve los ntawm kev txav ntawm lub valve qia. Qhov no yog ib qho teeb meem sealing thaum lub sij hawm txheeb ze txav. Txoj kev sealing tseem ceeb yog lub thawv ntim khoom. Muaj ob hom kev ntim cov thawv ntim khoom: caj pas hom thiab compression txiv ntoo. Hom caj pas yog hom siv feem ntau tam sim no. Feem ntau hais lus, nyob rau hauv cov nqe lus ntawm daim ntawv ntawm lub caj pas, nws yuav muab faib ua ob hom: ua ke hom thiab ib hom. Txawm hais tias txhua daim ntawv sib txawv, lawv yeej muaj xws li bolts rau compression. Cov txiv ntoo compression feem ntau yog siv rau cov khoom me me. Vim qhov me me ntawm hom no, lub zog compression raug txwv.
Nyob rau hauv lub thawv ntim khoom, txij li thaum lub ntim yog nyob rau hauv kev sib cuag ncaj qha nrog lub valve qia, lub ntim yuav tsum muaj zoo sealing, me me kev sib txhuam coefficient, muaj peev xwm hloov mus rau lub siab thiab kub ntawm nruab nrab, thiab corrosion-resistant. Tam sim no, feem ntau siv cov fillers suav nrog roj hmab O-rings, polytetrafluoroethylene braided packing, asbestos packing thiab yas molding fillers. Txhua qhov muab tub lim muaj nws tus kheej cov xwm txheej thiab ntau yam, thiab yuav tsum tau xaiv raws li cov kev xav tau tshwj xeeb. Kev sib khi yog los tiv thaiv kom tsis txhob tawm, yog li lub hauv paus ntsiab lus ntawm kev sib khi valve kuj tau kawm los ntawm qhov kev xav ntawm kev tiv thaiv kev tawm. Muaj ob yam tseem ceeb ua rau cov dej xau. Ib qho yog qhov tseem ceeb tshaj plaws uas cuam tshuam rau kev ua tau zoo ntawm kev sib khi, uas yog, qhov sib txawv ntawm cov khub sib khi, thiab lwm qhov yog qhov sib txawv ntawm ob sab ntawm lub sealing khub. Lub hauv paus ntsiab lus valve sealing tseem raug tshuaj xyuas los ntawm plaub yam: kua sealing, gas sealing, to channel sealing txoj cai thiab valve sealing khub.

Ua kua nruj

Lub sealing zog ntawm cov kua yog txiav txim los ntawm viscosity thiab nto nro ntawm cov kua. Thaum lub capillary ntawm lub qhov dej xau tau ntim nrog roj, qhov nro ntawm qhov chaw tuaj yeem rub cov kua los yog qhia cov kua rau hauv capillary. Qhov no tsim lub kaum sab xis. Thaum lub kaum sab xis qis dua 90 °, cov kua yuav raug txhaj rau hauv lub capillary, thiab cov dej xau yuav tshwm sim. Cov dej xau tshwm sim vim muaj cov khoom sib txawv ntawm cov xov xwm. Kev sim siv cov xov xwm sib txawv yuav ua rau cov txiaj ntsig sib txawv raws li tib yam. Koj tuaj yeem siv dej, cua lossis roj av, thiab lwm yam. Thaum lub kaum sab xis siab dua 90 °, cov dej xau kuj yuav tshwm sim. Vim hais tias nws muaj feem xyuam rau cov roj los yog siv quav ciab zaj duab xis ntawm cov hlau nto. Thaum cov yeeb yaj kiab saum npoo no tau yaj lawm, cov khoom ntawm cov hlau saum npoo hloov pauv, thiab cov kua dej qub qub yuav ntub dej thiab xau. Nyob rau hauv qhov kev pom ntawm qhov teeb meem saum toj no, raws li Poisson cov mis, lub hom phiaj ntawm kev tiv thaiv los yog txo cov pa tawm tuaj yeem ua tiav los ntawm kev txo cov kab capillary thiab nce viscosity ntawm nruab nrab.

Gas nruj

Raws li Poisson cov mis, qhov nruj ntawm cov roj muaj feem xyuam nrog cov viscosity ntawm cov roj molecules thiab cov roj. Cov dej xau yog inversely proportional rau qhov ntev ntawm lub raj capillary thiab lub viscosity ntawm cov roj, thiab ncaj qha proportional rau txoj kab uas hla ntawm lub capillary raj thiab lub zog tsav tsheb. Thaum txoj kab uas hla ntawm lub raj capillary yog tib yam li qhov nruab nrab ntawm txoj kev ywj pheej ntawm cov roj molecules, cov roj molecules yuav ntws mus rau hauv lub raj capillary nrog cov cua sov dawb. Yog li ntawd, thaum peb ua qhov kev ntsuam xyuas valve, qhov nruab nrab yuav tsum yog dej kom ua tiav cov nyhuv sealing, thiab huab cua, uas yog, roj, tsis tuaj yeem ua tiav cov nyhuv sealing.

Txawm hais tias peb txo cov kab mob capillary hauv qab cov roj molecules los ntawm cov yas deformation, peb tseem tsis tuaj yeem nres cov roj ntws. Qhov laj thawj yog tias cov pa roj tseem tuaj yeem cuam tshuam los ntawm cov phab ntsa hlau. Yog li ntawd, thaum peb ua cov kev ntsuam xyuas roj, peb yuav tsum nruj dua li kev ntsuas kua.

Lub hauv paus ntsiab lus ntawm sealing channel

Lub valve foob muaj ob ntu: qhov tsis sib xws ntawm cov nthwv dej saum npoo av thiab qhov roughness ntawm waviness nyob rau hauv qhov kev ncua deb ntawm yoj peaks. Nyob rau hauv cov ntaub ntawv uas feem ntau ntawm cov ntaub ntawv hlau nyob rau hauv peb lub teb chaws muaj tsawg elastic strain, yog hais tias peb xav kom ua tau ib tug kaw lub xeev, peb yuav tsum tau nce siab dua cov kev xav tau ntawm compression quab yuam ntawm cov khoom hlau, uas yog, compression quab yuam ntawm cov khoom. yuav tsum tshaj nws elasticity. Yog li ntawd, thaum tsim lub valve, lub sealing khub yog txuam nrog ib tug tej yam hardness txawv. Nyob rau hauv qhov kev txiav txim ntawm lub siab, ib tug tej yam degree ntawm yas deformation sealing nyhuv yuav raug tsim.

Yog hais tias lub sealing nto yog ua los ntawm cov khoom siv hlau, ces cov ntsiab lus tsis sib xws ntawm qhov chaw yuav tshwm sim ntxov tshaj plaws. Thaum pib, tsuas yog ib qho me me tuaj yeem siv los ua cov yas deformation ntawm cov ntsiab lus tsis sib xws. Thaum qhov kev sib cuag saum npoo nce, qhov tsis sib xws ntawm qhov chaw ua cov yas-elastic deformation. Lub sijhawm no, qhov roughness ntawm ob sab hauv qhov chaw so yuav tshwm sim. Thaum nws yog ib qho tsim nyog los siv lub nra hnyav uas tuaj yeem ua rau cov yas deformation loj ntawm cov khoom siv hauv qab, thiab ua rau ob qhov chaw nyob sib ze, cov kev seem no tuaj yeem ua kom ze rau ntawm txoj kab txuas ntxiv thiab kev coj mus ncig.

Valve sib khi

Lub valve sealing khub yog ib feem ntawm lub rooj zaum valve thiab cov tswvcuab kaw uas kaw thaum lawv tuaj sib cuag. Thaum siv, hlau sealing nto yog yooj yim puas los ntawm entrained media, media corrosion, hnav hais, cavitation thiab yaig. Xws li hnav cov khoom. Yog tias cov khoom hnav me dua qhov roughness ntawm qhov chaw, qhov tseeb ntawm qhov chaw yuav raug txhim kho es tsis yog deteriorated thaum lub sealing nto yog hnav. Yog li ntawd, thaum xaiv cov khoom hnav, yam xws li lawv cov ntaub ntawv, kev ua haujlwm, lubricity, thiab corrosion ntawm sealing nto yuav tsum tau txiav txim siab.

Ib yam li hnav cov khoom, thaum peb xaiv cov ntsaws ruaj ruaj, peb yuav tsum ua tib zoo xav txog ntau yam uas cuam tshuam rau lawv cov kev ua tau zoo txhawm rau tiv thaiv kom tsis txhob tawm. Yog li ntawd, nws yog ib qho tsim nyog yuav tau xaiv cov khoom uas tiv taus corrosion, khawb thiab yaig. Txwv tsis pub, qhov tsis muaj qhov yuav tsum tau ua yuav txo nws txoj kev sib khi zoo heev.