O-rings yog cov roj hmab puag ncig, thawj zaug siv los ua cov khoom sib khi rau lub tog raj kheej lub tog raj kheej hauv nruab nrab-19th caug xyoo.
Lawv yog cov yooj yim hauv cov qauv, tsis tshua muaj nqi, thiab muab kev ruaj ntseg sealing, muaj peev xwm tiv taus siab ntawm kaum tawm megapascals. Lawv tsim nyog rau kev sib khi zoo li qub thiab cov ntawv siv dynamic xws li hydraulic lub tog raj kheej pistons. Cov khoom muaj xws li nitrile roj hmab thiab fluororubber. Raws li bidirectional sealing keeb, lawv ua tiav lawv tus kheej - sealing los ntawm kev pib compression thiab lub zog siab. Lub compression deformation tus nqi yog 15% -30% rau static sealing thiab 9% -25% rau dynamic sealing. Thaum lub sij hawm installation, tus nqi elongation (tsawg dua los yog sib npaug rau 6% rau bores) los yog ib ncig ntawm compression (tsawg dua los yog sib npaug li 3% rau shafts) yuav tsum tau tswj. Rau qhov siab tshaj 5 MPa, lub nplhaib tuav tau raug pom zoo.
Kev xaiv cov khoom siv yuav tsum ua tib zoo xav txog qhov nruab nrab, qhov kub thiab txias, ua raws li cov qauv xws li GB 1235-76 thiab AS568, nrog rau cov kev qhia tshwj xeeb xa mus rau HG / T 2579-2008, thiab ua tau raws li cov ntawv pov thawj tshwj xeeb ntawm kev lag luam xws li zaub mov, tsheb, thiab aerospace. Kev khiav hauj lwm kub yog -55℃mus rau 250 degree, thiab nws muaj peev xwm tiv taus roj, acids, alkalis, thiab tshuaj corrosion.