Lub rooj zaum hauv lub tshuab hluav taws xob sab hauv hluav taws xob los yog lub tshuab hluav taws xob yog qhov chaw tiv thaiv uas qhov nqus tau los yog lub qhov tso pa tawm thaum lub sijhawm ua haujlwm ntawm lub tshuab ua haujlwm thaum lub valve kaw.Lub rooj zaum valve yog ib qho tseem ceeb ntawm lub cav nyob rau hauv uas yog tias nws tsis raug tso cai, taw qhia, los yog tsim thaum lub sij hawm tsim khoom, valve leakage yuav tshwm sim uas yuav cuam tshuam rau lub cav compression piv thiab yog li lub cav efficiency, kev ua tau zoo (lub zog thiab torque), tshem tawm emissions, thiab engine lub neej.
Lub rooj zaum valve feem ntau yog tsim los ntawm thawj nias-haum ib qho kwv yees li cylindrical daim ntawm cov hlau alloy hardened, xws li Stellite, mus rau hauv ib tug cam khwb cia kev nyuaj siab nyob rau hauv lub tog raj kheej taub hau saum toj ntawm txhua qhov kawg valve qia txoj hauj lwm, thiab ces machining ib tug conical-section nto rau hauv lub valve. lub rooj zaum uas yuav mate nrog ib tug sib thooj conical-section ntawm coj valve.Feem ntau ob qhov chaw conical-section, ib qho nrog lub kaum sab xis dav dua thiab ib qho nrog lub khob hliav qab-lub kaum sab xis, yog machined saum toj thiab hauv qab ntawm qhov tseeb mating nto, tsim cov mating nto rau qhov dav (hu ua "narrowing" lub rooj zaum), thiab ua kom nws nyob zoo nrog rau qhov (dav) mating nto ntawm lub valve, thiaj li muab kev sib khi zoo thiab hloov hluav taws xob, thaum lub valve raug kaw, thiab muab cov yam ntxwv zoo ntawm cov roj ntws los ntawm lub valve, thaum nws qhib.
Cov tshuab pheej yig tuaj yeem muaj lub rooj zaum valve uas tsuas yog txiav rau hauv cov khoom ntawm lub tog raj kheej lub taub hau lossis lub cav thaiv (nyob ntawm qhov tsim ntawm lub cav).Qee lub tshuab tshiab tshiab muaj cov rooj zaum uas tau txau rau ntawm qhov tsis yog nias rau hauv lub taub hau, tso cai rau lawv nyias, tsim kom muaj kev hloov pauv ntawm cov cua sov los ntawm lub rooj zaum valve, thiab ua rau lub valve stems ua haujlwm ntawm qhov kub qis, yog li tso cai rau lub valve. stems (thiab lwm qhov chaw ntawm lub valvetrain) kom nyias thiab sib dua.
Muaj ntau txoj hauv kev uas lub rooj zaum valve yuav raug muab tso rau hauv qhov chaw tsis raug lossis machined.Cov no suav nrog lub rooj zaum tsis tiav thaum lub sij hawm xovxwm haum-kauj ruam, distortion ntawm nominally ncig valve lub rooj nto xws li lawv deviate unacceptably los ntawm zoo meej roundness los yog waviness, qaij ntawm machined nto txheeb ze rau lub valve qhia qhov axis, sib txawv ntawm lub rooj zaum valve ntawm concentricity. nrog rau lub valve qhia qhov, thiab sib txawv ntawm machined conical seem ntawm lub rooj zaum valve los ntawm lub khob hliav qab lub kaum sab xis uas yuav tsum tau kom phim lub valve nto.Kev tswj hwm zoo ntawm cov rooj tog zaum thiab cov tshuab ua haujlwm tau ib txwm ua tau nyuaj heev kom ua tiav kom txog rau thaum lub tswv yim ntawm digital holography uas tau ua kom muaj txiaj ntsig zoo rau kev ntsuas tag nrho cov kev sib txawv no.
| Khoom npe | Main Khoom | Sau ntawv | Qhov kub thiab txias |
|---|---|---|---|
| VIRGIN PTFE | Tsis tshua muaj coefficient ntawm kev sib txhuam thiab zoo heev chemical kuj. | FDA pom zoo | -40 ° C rau 260 ° C |
| 15% iav puv PTFE | Txo compressive zog thiab qis deformation nyob rau hauv load dua nkauj xwb PTFE. | Abrasive khoom | -40 ° C rau 260 ° C |
| 25% iav puv PTFE | Zoo ib yam li 15% iav zoo hnav tsis kam, siab zog compressive thiab qis deformation nyob rau hauv load. | Abrasive khoom | -40 ° C rau 260 ° C |
| Stainless hlau puv PTFE | Hnav hnyav heev.Zoo heev lub zog thiab stability nyob rau hauv huab loads thiab siab kub. | Nws tuaj yeem siv rau hauv daim ntawv thov cov dej thiab cov dej thermal | -40 ° C rau 260 ° C |
| TFM | Ntau denser polymer qauv dua Virgin PTFE.Qhia txog kev ntxhov siab zoo dua. | Hloov TFE Polymer | -40 ° C rau 260 ° C |
| Carbon Graphite puv TFM | Tsawg thermal expansion-contraction tus nqi dua li cov pa TFM. | Qhov zoo tshaj plaws rau kev siv ntawm cov ntawv siv chav dej thiab cov dej thermal | -40 ° C txog 260 ° C thiab txawm tias 320 ° C ntawm cov ntawv thov Thermal Fluid |
| UHMWPE | Cov tshuaj tiv thaiv corrosive heev, tshwj tsis yog oxidising acids thiab organic solvents. | Kuj hu ua High Modulus Polyethylene (HMPE) lossis High Performance Polyethylene (HPPE) | -40 ° C rau + 80 ° C |
| PCTFE | Zoo heev rau kev siv cryogenic thiab Oxygen. | Ib homo-polymer ntawm Chlorotrifluoroethylene | -270 ° C rau 260 ° C |
| Virgin PEEK 450G | Cov tshuaj tiv thaiv zoo heev thiab txhua yam khoom ntawm qhov kub siab. | Ib qho organic polymer thermoplastic | -40 ° C rau 260 ° C |
| Carbon Filled PEEK | Ntau yam zoo sib xws rau Virgin PEEK.Tshwj xeeb yog tsim rau siab kub thiab siab load. | Tsawg coefficient ntawm kev sib txhuam thiab haum rau ntau daim ntawv thov corrosive heev | -40 ° C rau 260 ° C |
| PEB HT | Khaws tag nrho cov yam ntxwv tseem ceeb thiab cov txiaj ntsig ntawm PEEK 450G tab sis khaws cov khoom ntawm lub cev mus rau qhov kub siab dua. | Muaj peev xwm muab tau rau hauv ob qho tib si nkauj xwb tsis tau sau lossis ua cov khoom sib xyaw ua ke | mus txog 260 ° C |
| Acetal thiab Delrin | Pom zoo tiv thaiv hnav thiab deformation nyob rau hauv load. | Zoo heev rau kev siv lub rooj zaum valve | mus txog 80 ° C |
| VESPEL | Cov khoom siv polyimide uas muaj peev xwm kub kub hauv qhov hnyav thiab yog siv rau kev siv hluav taws xob hloov pauv, roj kub thiab roj. | Yuav tsum tsis txhob siv nrog STEAM |
Post lub sij hawm: Jan-24-2019