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1、實(shí)用文檔真空壓力浸漆絕緣工藝研究InsulationTechnologyStudyaboutVacuumPressureImpregnation1真空壓力浸漆（簡(jiǎn)稱：VPI）絕緣工藝1VacuumPressureImpregnation(VPI)InsulationProcessVPI-真空壓力浸漬工藝是將工件預(yù)烘去潮后冷卻，置于真空環(huán)境中，排除白坯線圈內(nèi)部的空氣和揮發(fā)物，依靠真空中漆液重力和線圈毛細(xì)管作用，以及利用干燥的壓縮空氣或惰性氣體，對(duì)解除真空后的浸漬漆液施加一定壓力的作用，使漆液迅速滲透并充滿絕緣結(jié)構(gòu)內(nèi)層。在國(guó)內(nèi)，目前VPI還是一種間隙作業(yè)的絕緣工
2、藝。工件的滴干工序在浸漆罐內(nèi)進(jìn)行，其干燥工序一般另設(shè)容器或烘箱進(jìn)行，方式有真空干燥、常壓靜置干燥或旋轉(zhuǎn)干燥。TheprocessofVPI-Vacuumpressureimpregnationtechnologyistocooltheworkpieceafterpre-bakinganddehumidify,thenputitintovacuumenvironmentandexhaustairandvolatilesinsidethecoil.Afterthatputpressureontheimpregnationvarnishliquidbydepend
3、ingontheactionbetweenliquidgravityandcoilcapillaryandutilizingdrycompressedairorinactivegas,thenthevarnishliquidwillpenetrateandbefullofinnerofinsulation.Sofar,theVPIprocessisadiscontinuousoperationathome.Theprocessofdrip-dryworksinimpregnationcans.Andthedryingprocessworksintheothe
4、r文案大全實(shí)用文檔heatingdevices,themethodsincludevacuumdrying,strandingdryingatordinarypressureandrotatingdrying.VPI-工藝流程：⊙→預(yù)烘除濕→入罐→真空排氣→真空浸漆→壓力浸漬→壓力排漆→卸壓滴漆→出罐→固化干燥→⊙。VPI-process:⊙→pre-bakingandtodehumidify→workpieceintothevacuumexhausttank→vacuumexhaust→vacuumimpregnation→pressureimpregna
5、tion→pressureremovepaint→reliefpressure,drippingpaint→workpieceoutthetank→curingbaking→⊙.比較：顯然，VPI在漆液滲透方面和浸漬方面，遠(yuǎn)遠(yuǎn)優(yōu)于其它浸漆工藝。在應(yīng)用方面，VPI更適合大型高壓線圈、多層齊繞磁軛線圈和要求較高的大型繞組、以及其它高壓線圈。理論上，VPI的應(yīng)用，真空和壓力可以做得相當(dāng)?shù)母?，?dāng)然成本也高了。FGH則不然，由于連續(xù)作業(yè)，以及產(chǎn)量和成本的具體要求，其應(yīng)用具有一定范圍的限制。Makeacomparison:Obviously,thevarnishliqu
6、idpenetrationandimpregnationofVPIissuperiortotheothertechnology.Intermsofapplication,VPIbettersuitsthelarge-scalehighvoltagecoil,multilayermagneticyokecoil,demandinglarge-scalecoilandotherhighvoltagecoil.Intheory,vacuumandpressurecanachievequitehighwhileapplyingVPI,thecostishighatt
7、hesametime.Onthecontrary,FGHisnotthecase.Becauseofthecontinuousoperationandthespecificrequirementsofproductionandcost,whichlimittherangeofapplication.文案大全實(shí)用文檔在應(yīng)用試驗(yàn)和實(shí)際工作中，我們發(fā)現(xiàn)，真空環(huán)境對(duì)于某一溫度條件下的一種浸漬漆液，當(dāng)其真空度低于某一絕對(duì)壓力的數(shù)值時(shí)，亦即達(dá)到某一對(duì)應(yīng)的“臨界”真空時(shí)，會(huì)導(dǎo)致該浸漬漆液中大量泡沫和液面大量霧氣的產(chǎn)生，即發(fā)生“沫化”和“霧化”現(xiàn)象?！澳痹斐善嵋褐写罅靠?/p>
8、穴，會(huì)阻礙浸滲。“霧化”致使溶劑或稀釋劑大量逸出，會(huì)
