Varnish

DEFINITION

Dhipoziti yakatetepa, yakaoma, inopenya, isina kunyungudika neoiri, inoumbwa zvakanyanya nemarara, uye inonyanya kutsanangurwa nekusimba kweruvara.Haibviswe nyore nyore nekupukuta netsvina, yakaoma, yakapfava, isina-lint-isina yekupukuta uye inoshingirira kune zvinonyungudutsa zvinonyungudutsa.Ruvara rwayo runogona kusiyana, asi rinowanzoonekwa mune grey, brown kana amber hues.Kunobva: ASTM D7843-18

VARNISH INOGADZIRWA SEI

Kazhinji, mafuta ekuzora anodzikira mubasa nekuda kwemakemikari, kupisa, kushushikana kwemagetsi izvo zvinomhanyisa kuita kwemafuta oxidation uye kuumbwa kwevarnish kunotanga neoxidation.

Chikamu 1: Oxidation

-Kemikari:Mazhinji maitiro emakemikari anoitika semakore emafuta.Oxidation yemafuta inotungamira kune akawanda ekuora zvigadzirwa, zvinosanganisira insoluble particulates uye acids.Kupisa uye kuvapo kwesimbi zvinhu (Iron, Copper) inomhanyisa maitiro.Pamusoro pezvo, mafuta ane aerated zvakanyanya anotapukirwa neOxidation.

-Thermal:Kana mabhubhu emhepo achiiswa mumafuta, kutadza kwakanyanya kwemafuta kunogona kuitika nekuda kwemamiriro anozivikanwa sePID (Pressure-induced Dieseling) Kana PTG (Pressure-induced Thermal Degradation).Iyo tembiricha yemuno inodarika 538 ℃ kana mabhubhu emhepo akadonha pasi pekumanikidzwa kukuru, izvo zvinotungamira mukudzikira kwekupisa.

-Mechanical:"Kuveura" kunoitika kana mamorekuru emafuta anotsemuka nepakati paanoyerera pakati penzvimbo dzinofamba.

Chikamu chechipiri: Polymerization

Polymerization inoitika sezvigadzirwa zveoxidation & ekuwedzera maitiro zvinosanganisa uye kugadzira mamorekuru-cheni mamorekuru ane huremu hwepamusoro.Aya mamorekuru ane polarized.Mwero wemolecular polymerization unoenderana nekupisa uye kuwanda kwe-by-zvigadzirwa zve oxidation.

Chikamu chechitatu: Solubility

Inoratidza kugona kunyungudutsa mamorekuru mukati memhinduro inobatwa zvakananga nekupisa.Sezvo ne-zvigadzirwa zve oxidation zvichiramba zvichigadzirwa, iyo fluid iri padyo nesaturation point.

Iyo nzira inokonzeresa yekuiswa kwe particulate varnish inodzorereka.Muzviitiko zvakawanda, kana varnish ichiita, inogona kudzoserwa mumvura uye yakaputsika kana iyo solubility ye lubricant ichiwedzera.

Chikamu chechina: Kunaya kwemvura

Mvura haigone kunyungudutsa mamorekuru matsva epolymerized painosvikwa kana mvura inopfuura nemunzvimbo dzinotonhorera (Iyo solubility inodzikira kana tembiricha yadonha).Sezvimwe zvigadzirwa zveoxidative zvisingagone kubatwa mumhinduro, zvinodonha uye zvinogadzira zvinyoro zvinyoro (sludge/varnish).

Chikamu chechishanu: Agglomeration

Izvo zvisinganyungudika zvinyoro zvinyoro zviri nyore kuunganidza mumwe nemumwe uye kuumba hombe polarized particles ine yakakwira molecular huremu.

Chikamu chechitanhatu: Varnish yakagadzirwa

Masimbi ane polar kupfuura aya mapolarized particles kuitira kuti aungane zviri nyore pamusoro pesimbi (nzvimbo dzinotonhorera, kucheneswa kwakanaka, kuyerera kwakaderera) apo inonamira layer(Varnish) inoumbwa uye inokwezva zvimwe zvimedu zvinonamira pazviri.Ndizvo zvakaita varnish

Varnish Harzds

◆Kunamatira uye kubata mavharuvhu

◆Overheated bearings

◆Kuderera kwekushanda kwezvinopisa kupisa

◆Kuwedzera kupfeka pane zvakakosha zvikamu uye mavharuvhu

◆Hupenyu hwakapfupikiswa hweMichina, lubricant, mafirita uye zvisimbiso

NZIRA YEKUONA VARNISH

Nekuda kwemhedzisiro inodhura yekuvapo kwevarnish, Iwe unofanirwa kutarisa mamiriro evarnish inogona mune yako lubricating system.Nzira dzinonyanya kugamuchirwa ndeyeMembrane Patch Colorimetry(MPC ASTM7843).Iyi nzira yekuyedza inobvisa zvinosvibisa zvisinganyungudika kubva mu-sevhisi turbine mafuta pachigamba (ine 0.45µm membrane) uye ruvara rwe membrane chigamba chinoongororwa ne spectrophotometer.Zvigumisiro zvinonzi ΔE kukosha.

SOLUTIONS FOR VARNISH REMOVAL

Model	Soluble Varnish	Insoluble Varnish	Mvura
WVDJ	√	√	√
WVD-II	√	√
WJD		√
WJL		√