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ID:40420092
大小:19.90 KB
页数:8页
时间:2019-08-02
《真空浸漆绝缘工艺研究》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、真空压力浸漆绝缘工艺研究InsulationTechnologyStudyaboutVacuumPressureImpregnation1真空压力浸漆(简称:VPI)绝缘工艺1VacuumPressureImpregnation(VPI)InsulationProcessVPI-真空压力浸渍工艺是将工件预烘去潮后冷却,置于真空环境中,排除白坯线圈内部的空气和挥发物,依靠真空中漆液重力和线圈毛细管作用,以及利用干燥的压缩空气或惰性气体,对解除真空后的浸渍漆液施加一定压力的作用,使漆液迅速渗透并充满绝缘结构内层。在国内,目前VPI还是一种间隙作业的绝缘工艺。工件的滴干工序在浸漆罐内
2、进行,其干燥工序一般另设容器或烘箱进行,方式有真空干燥、常压静置干燥或旋转干燥。TheprocessofVPI-Vacuumpressureimpregnationtechnologyistocooltheworkpieceafterpre-bakinganddehumidify,thenputitintovacuumenvironmentandexhaustairandvolatilesinsidethecoil.Afterthatputpressureontheimpregnationvarnishliquidbydependingontheactionbetweenliq
3、uidgravityandcoilcapillaryandutilizingdrycompressedairorinactivegas,thenthevarnishliquidwillpenetrateandbefullofinnerofinsulation.Sofar,theVPIprocessisadiscontinuousoperationathome.Theprocessofdrip-dryworksinimpregnationcans.Andthedryingprocessworksintheotherheatingdevices,themethodsincludev
4、acuumdrying,strandingdryingatordinarypressureandrotatingdrying.VPI-工艺流程:⊙→预烘除湿→入罐→真空排气→真空浸漆→压力浸渍→压力排漆→卸压滴漆→出罐→固化干燥→⊙。VPI-process:⊙→pre-bakingandtodehumidify→workpieceintothevacuumexhausttank→vacuumexhaust→vacuumimpregnation→pressureimpregnation→pressureremovepaint→reliefpressure,drippingpain
5、t→workpieceoutthetank→curingbaking→⊙.比较:显然,VPI在漆液渗透方面和浸渍方面,远远优于其它浸漆工艺。在应用方面,VPI更适合大型高压线圈、多层齐绕磁轭线圈和要求较高的大型绕组、以及其它高压线圈。理论上,VPI的应用,真空和压力可以做得相当的高,当然成本也高了。FGH则不然,由于连续作业,以及产量和成本的具体要求,其应用具有一定范围的限制。Makeacomparison:Obviously,thevarnishliquidpenetrationandimpregnationofVPIissuperiortotheothertechnolog
6、y.Intermsofapplication,VPIbettersuitsthelarge-scalehighvoltagecoil,multilayermagneticyokecoil,demandinglarge-scalecoilandotherhighvoltagecoil.Intheory,vacuumandpressurecanachievequitehighwhileapplyingVPI,thecostishighatthesametime.Onthecontrary,FGHisnotthecase.Becauseofthecontinuousoperation
7、andthespecificrequirementsofproductionandcost,whichlimittherangeofapplication.在应用试验和实际工作中,我们发现,真空环境对于某一温度条件下的一种浸渍漆液,当其真空度低于某一绝对压力的数值时,亦即达到某一对应的“临界”真空时,会导致该浸渍漆液中大量泡沫和液面大量雾气的产生,即发生“沫化”和“雾化”现象。“沫化”造成漆液中大量空穴,会阻碍浸渗。“雾化”致使溶剂或稀释剂大量逸出,会影响固化。Intheapplicatio
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