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径向叶片的叶轮叶片出口安装角β

时间:2012-05-31 19:40来源:jszjy.com 作者:assa 点击:
后向(弯)式三种:
1.前向叶片的叶轮:叶片出口安装角β<90°。
2.径向叶片的叶轮:叶片出口安装角β=90°。
3.后向叶片的叶轮:叶片出口安装角β>90°。
后向式叶片的叶轮,空气和叶片之间撞击很小,能量损失少,效率高,运转时噪声小,但空气从风机动性所获得的压力较低;前向式叶片的叶轮与后向式相比,能量损失较大,效率较低,但产生的风压较高,其叶轮直径与转数均可小些。径向式叶片的优缺点介于后向式和前向式之间,其特点是流道通畅是易积尘,且强度较高。
叶轮的形状和叶片数目随着压力的大小而不同。压力愈向,叶片愈窄而长,数目愈少,反之压力愈低则叶片就宽而短,数目愈多。在确定风机叶片型时,应根据风机在使用过程中的主要矛盾来考虑,如希望风机效率较高,噪声、压力较小时,则可选用后向式叶片的见机。
风口:也称集流器。若风机的进口不接风管,而直接从大气中进风,则应有集流器。集流器的形式有圆筒形(制作简单但能量损失大)、圆锥形(能量损失较小,制作也简单)、圆弧形(能量损失更小,但制作较困难)三种。
电动机:电动机是把电能变为机械的机器,是近代工业上的重要动力装备。通称为马达。电动机一般可分为直流电动机与交流电动机等。
常用的交流电动机指的是三相异步电动机和同步电动机。
异步电动机是工农业生产以及家用电器中用途广。在各种金属切削机订,锻压机械、轧钢机和矿山、起重、运输等设备的拖动中,异步电动机是一种很重要的原动机。异步电动机结构简单、坚固耐用、维护方便、价格较低,且效率比较高,工作牺性比较好。但其主要缺点是功率因数比较低,调速性能不够好。
三相异步电动机主要由定子和转子构成,定子是固定不动的部分,转子是旋转的部分,在定子与转子之间有一定的气隙。三相异步电动机的定子由铁芯、绕组和机座三部分组成。三相异步电动机按其转子结构分为有鼠笼式异电动机和线绕转子异步电动机。
同步电动机是定子和转子两个主要部分所构成的。同步电动机的定子和异步电动机一样是由机座、铁芯和嵌在铁芯槽中的本相对称绕组成。同步电动机的转子由于结构形式不同,分为隐极式和凸极式两种。两种形式其工作原理基本上是一致的,但同步电动机的转子大都采用凸极式的。
直流电动机由静止部分(定子)与转动部分(转子)组成。定子和转子之间由空气隙分开。静子部分用铸铁或铸钢制成圆筒形铁轭,内部固定着由硅钢片叠成的磁极。在磁极上的励磁绕组,当通过直流电时,磁极便能产生磁场。转动部分为冲有许多槽的硅钢片迭成圆柱形,在槽中嵌入电枢绕组,电枢的一端装有互相绝缘的钢片(换向片)组成的换向器,换向器上紧压着石墨电刷,电刷本身在空间是固定不动的,它与换向器保持滑动接触。
12.注水装置安装
工程范围与工作内容:基础清理、检查、划线,注水模块吊装就位、安装找正,设备本体附件、一次仪表、排污管道等安装。
【释义】注水装置:
划戌:常用的划线工肯,有不锈钢钢板尺、钢板直尺、角尺、划规、地规、量角器、划计等。
划线之后就要号料,切割进行加正,然后进行校正。
吊装:利用起吊设备将注水模块吊起后运至安装位置进才安装。
找正:用水平尺测量好点位,并将对应点对准,这就是找正。
排污:当附属设备进行一段时间后会产生灰尘或污物,应采取有关措施将其处理掉的工序叫排污。
13.离线水清洗装置安装
工程范围与工作内容:清洗剂罐垫铁与基础接触面凿平,垫铁配置,吊装就位、安装找正,清洗水泵、加药泵检查、测量、调整、组合安装,电动机的组合安装,流量孔板调整、安装,就地控制柜就位与安装,电加热装置、蒸汽加热装置调试安装,随设备供应的清洗水管道、加药管道、阀门、附件和一次仪表等安装,水压试验。
【释义】清洗剂罐:盛装清洗剂的容器。常用的清洗剂有:
1.煤油
煤油的相对密度不大于0.84,闪点不低于40℃,不含有水溶性酸和碱,价格低,能溶解润滑油和润滑脂。且挥发性比汽油低。在机械设备安装工程中广泛用作清洗剂,适用于一般设备、零部件的清洗。
2.汽油
汽油分工业汽油及车用汽油。工业汽油的相对密度在0.65~0.78之间,挥发性强,可作溶刘,它适用于一般机械设备清洗润滑油及润滑脂用。其闪点比煤油低,在使用过程中,工作地点汽油挥发浓度不许超过03mg/L,否则易发生危险,机件经过汽油清洗后,应立即涂油否则表面很快锈蚀。
它的粘度比煤油略高,aaa2aaa一般也可用作清洗剂。
4.松节油
这是一种清洗漆膜的清洗剂。它是无色(或微黄色)透明的油状物,对一般油基漆、醇酸树脂漆、天然树脂漆清洗效果好,它的溶解能力大于松香水。
5.松香水
透明无色,毒性小。它可用来清洗性调和漆、磁漆、醇酸漆、油性清漆和沥青清漆等。
6.洒精
洒精用途很广,燃点低,易挥发,能溶解漆片,故在机械设备安装过程中多用于清洗干性透明漆用。酒精应放在密封的容器内,否则会很快挥发。aaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaa7.香蕉水
香蕉水是有机酯、酮、醇、烃类的混合液、溶解力极强。香蕉水专为稀释硝基漆用,或溶解漆膜,挥发性强,可以用来清洗机械设备表面的防锈漆的部分。aaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaa8.四氯化碳
能溶解各种油类,有毒,一般作为去油剂,对禁油设备是必不可少的清洗材料。
9.二氯乙烷aaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaa是一种无色(或淡红色)透明液体,有臭体,可溶于水,毒性较大。对黑色金属略有腐蚀性。一般适用于金属制件的脱脂。
10.碱性清洗剂
它是一种脱脂剂,一般要加热到60~90℃进行清洗。见表4-34。
11.盐酸aaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaaaaa2aaa(责任编辑:admin)
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