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;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;">屏蔽泵是由屏蔽电机与机械泵组合在一起的机电一体化设备。所谓屏蔽电?span lang="EN-US">,</span>就是在电机的定子与转子之间加了一个非导磁材料制作的屏蔽套,将电机的定子与转子分成两个互不相通的独立空间。这样做的目的就是要取消机械轴封(动静配合的机械密封?span lang="EN-US">,</span>以达到完全无泄露的效果。屏蔽泵采用滑动轴承代替滚动轴承,并且运转时所输送的液体充满转子与转子轴承之?span lang="EN-US">,</span>因此无须润滑。屏蔽泵运行平稳,噪音低。日常维护量也很少。由于屏蔽泵具有很多无法取代的优点,在化工,制冷,给排水,核工业等方面得到了广泛的应用。随着使用数量和应用范围增?span lang="EN-US">,</span>损坏量也在逐渐增加?span lang="EN-US"><br />    </span>以氨制冷设备所使用?span lang="EN-US">P1</span>系列屏蔽泵为例,介绍一下维修方法?span lang="EN-US"><br />    </span>一,屏蔽泵一般性故障诊断极修复<span lang="EN-US"><br />     1</span>,电机绕组线圈阻值正常;泵转不起来。原因是无液运行造成干磨,转子轴套与石墨轴承卡死。或是其他机械故障造成的卡死。处理方法,分解屏蔽泵,清洗配件,找到故障点。修理或更换配件?span lang="EN-US"> <br />     2</span>,电机没问题,但运行电流过大,原因是输送液体不够。有干磨情况。或者有机械犯卡和电机端盖紧固有偏差。处理方法。分解后。清洗重新装配?span lang="EN-US"><br />     3</span>,运行噪音很大,运行电流也不稳定。原因是转子轴套推力盘与石墨轴承等严重磨损。分解屏蔽泵。清洗更换磨损的原件。石墨轴承与轴承端盖间采用的是过度配合,必须加热轴承端盖,才能取出或装入石墨轴承。装配时要注意配合尺寸。轴向串动量?span lang="EN-US">0.5-1.5mm)</span>。经?span lang="EN-US">(0.08-0.12mm)</span>,最大磨损量不得超过<span lang="EN-US">(0.4mm) <br />     4</span>,电机绕组出现问题,只要屏蔽泵电机出现问题,屏蔽泵就必须进行大修?span lang="EN-US"><br />    </span>二。屏蔽泵的大?span lang="EN-US"><br />     </span>屏蔽泵的大修分两种情况来分别处理。一种是屏蔽套没有损坏,只是电机出现问题。另一种是电机和屏蔽套都已损坏。无论是那种情况,都必须切开屏蔽泵电机外壳,取出电机定子才能进行维修。对于屏蔽套没有损坏的情况,分解时要尽量保持屏蔽套的完好。以减少维修成本和工时?span lang="EN-US"><br />    1</span>,电机定子的取出方法<span lang="EN-US"><br />    </span>分解屏蔽泵,用扁铲铲开屏蔽套下环焊缝。用车床或切割机,沿电机外壳原焊缝处切开。打好定位点,将电机上定位盖及屏蔽套一同吊出(屏蔽套上环焊逢没有动)。检查电机外壳与定子间是否装有稳钉。如果有的话。要把稳钉取出。然后加热电机外壳,吊出定子。(电机外壳与定子间,也是采用是过度配合装配的)?span lang="EN-US"><br />    2</span>,电机的修复<span lang="EN-US"><br />    </span>屏蔽泵电机与普通电机区别不是很大,只是绝缘等级要求高些。可?span lang="EN-US">H</span>级电机的标准来做。最好选用<span lang="EN-US">QZY</span>系列的漆包线和耐高温绝缘材料,严格按照原电机的数据下线。以保证原电机性能?span lang="EN-US"><br />    3</span>,屏蔽套的制?span lang="EN-US"><br />    </span>对于已经无法修复的屏蔽套,只得重新制做。屏蔽套的制做是屏蔽泵维修的关键。要选用含镍量相对高些的耐腐蚀优质不锈钢板材,厚度要和原屏蔽套要相同,剪裁尺寸必须精确<span lang="EN-US">.</span>由于屏蔽套很薄,直逢焊接是其难点。如果有条件,最好用自动焊机焊接。手工焊接也能做到,只是技术要求比较高些。制作好的屏蔽套要滚圆,打压和检漏。我采用的方法是<span lang="EN-US">,</span>用氮气加压至<span lang="EN-US">1MPa</span>放入水中观察有无泄露。此种方法既简单也很实用?span lang="EN-US"><br />    4</span>,初装配与校?span lang="EN-US"><br />    </span>清理干净定子上的绝缘漆及污物,用毛刷将定子里外刷上少许冷冻机油。将屏蔽套压入定子中。装好上下保护套。加热电机外壳,压入定子,装进转子,装好上定位盖和石棉垫,将转子轴套推力盘与石墨轴承刷上少许冷冻机油。装好上下电机端盖和叶轮。进行调正,由于电机上盖与电机外壳已有定位。同心度已经没有问题,这里主要是调正左右偏差,当用手转动叶轮已经滑动自如时。即可将电机外壳与上定位盖焊上几点定位?span lang="EN-US"><br />    5</span>,空运转试验<span lang="EN-US"><br />    </span>通电运行。查看电机的空载电流。运转噪声和平稳度(时间不超过三分钟)。如果没有什么问题了,即可进行下道工序了?span lang="EN-US"><br />    6</span>,焊接与打压<span lang="EN-US"><br />    </span>重新分解屏蔽泵。先将电机外壳与上定位盖的焊缝焊接好。然后焊接屏蔽套的上下环焊缝。用车床车一?span lang="EN-US">,</span>内径小于屏蔽套内?span lang="EN-US">0.4mm</span>,长度短于屏蔽套<span lang="EN-US">6mm</span>的钢管作为支撑套。推入屏蔽套中,就可以打压了,方法是从电机接线口处充?span lang="EN-US">1.2mpa</span>的氮气,将修好的屏蔽电机放入水槽中试漏。两个小时内如果没有漏点。就可以总装。屏蔽泵维修相对来讲,技术要求比较高。但只要细心做。还是可以做好的?/span></p> <div class="xgxx"> <ul class="xg_bt"> 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