lesson18 maintenance procedures for reciprocating轮机英语阅读.pptx

Lesson18;1.Sincemarinecompressorsareencounteredinseveralforms,commentsonmaintenance维护保养willbemadebyfollowingthepassagesthrougheachformofmachines.

1.由于船用空压机有多种形式，下文将通过介绍不同形式的机型来探讨空压机的维护保养工作。;AirFilter空气滤器

2.Thedrytypeoffilter,asusedonmarinecompressors,hasafilteringmedia过滤介质ofeitherfeltedcloth毡布orpaper,thelatterusuallybeingslightlyoilcoated.

2.船用空压机使用的干式过滤器，其过滤介质是毡布或纸，后者通常轻微涂油。

Thistypeoffilterisquitesatisfactoryalthoughitsstrengthissometimessuspecton承受higherspeedmachines.

Themostwidelyusedtypeoffilteristheviscousimpingementtypefilter黏滞撞击型滤尘器,usuallyofcylindrical圆柱形designandthefilteringmediausuallybeingwoven[?w??vn]copperwire铜网ornylonstrands,whichare,whencleaned,dipped浸入inoilandallowedtodrainbeforefitting.

最常用的滤器为黏滞撞击型滤尘器，通常为圆柱状，滤网为铜网或尼龙绳，当清洗时要浸泡在油里，而且安装前要放残。;Theoilcoating油膜thentrapsthedirtquitesatisfactorily,sincetheatmosphere空气forthemarinecompressorisusuallyfairlyclean.

由于对船用空压机来说空气相当干净，所以油膜能很好地吸附污垢。

Thistypeoffilterisalsoquiteacceptableforoil-free无润滑machines,iftheunitisbeingusedforcontrollingair.

如果是控制空气的单元，这种滤器也可以用于无润滑机器。Firststagefailures一级故障have,onoccasions,beencausedbysomeofthecopperwirebeingteasedloose松弛andthepulsating[p?l?se?t??]震动airflowbendingthestrandsbackwardsandforwardsuntilastrand股hasbrokenfreeandlodged卡住awkwardlyineitheravalveorpistonclearance.

有时，一级故障是因为铜丝松弛，而且空气使得铜丝前后弯曲直到铜丝断裂或在气阀活塞间隙中无规律运动。;Ingeneral,thenylonstrand尼龙绳ismuchmoreresilient[r??z?li?nt]弹性inthisrespect.

通常尼龙丝回弹力较大。

Itisessentialthatthefilteriskeptinacleanconditionsothattheairpressuredropacrossthefilteriskepttoanabsoluteminimum最小,andtheengineerinchargeofthecompressorsshouldacceptashisresponsibilitytheblankingoffoftheairinletbeforeanypaintingtakesplace,asshouldthisareabepainteditwillcausetoogreatapressuredrop压降.;First