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16px;">一、啟動(dòng)自吸泵時(shí)：注意泵軸的轉向是否正確。注意轉動(dòng)時(shí)有無(wú)不正常的聲響和振動(dòng)。注意壓力表及真空表讀數，起動(dòng)后當壓力表及真空表的讀數經(jīng)過(guò)一段時(shí)間的波動(dòng)而指示穩定后，說(shuō)明自吸泵內已經(jīng)上液，進(jìn)入正常輸液作業(yè)。</span></div> <div> <span style="font-size:16px;">在自吸泵進(jìn)入正常輸液作業(yè)前即自吸過(guò)程中，應特別注意泵內水溫升高情況，如果這個(gè)過(guò)程過(guò)長(cháng)，泵內水溫過(guò)高，則停泵檢查其原因。如果自吸泵內液體溫度過(guò)高而引起自吸困難，那么可以暫時(shí)停機，利用吐出管路中的液體倒流回泵內或向泵體上加儲液口處直接向泵內補充液體，使泵內液體降溫，然后起動(dòng)即可。</span></div> <div> <span style="font-size:16px;">自吸泵在工作過(guò)程中如發(fā)生強烈振動(dòng)和噪聲，有可能是泵發(fā)生汽蝕所致，汽蝕產(chǎn)生的原因有兩種：一是進(jìn)口管流速過(guò)大，二是吸程過(guò)高。流速過(guò)大時(shí)可調節出口控制閥，升高壓力表讀數，在進(jìn)口管路有堵塞時(shí)則應及時(shí)排除;吸程太高時(shí)可適當降低泵的安裝高度。</span></div> <div> <span style="font-size:16px;">自吸泵在工作過(guò)程中因故停泵，需再起動(dòng)時(shí)，出口控制閥應稍開(kāi)(不要全閉)，這樣既有利于自吸過(guò)程中氣體從吐出口排出，又能保證尖在較輕的負責下啟動(dòng)。注意檢查管路系統有無(wú)滲漏現象。</span></div> <div> </div> <div> <span style="font-size:16px;">二、自吸泵停止注意事項及操作順序：</span></div> <div> <span style="font-size:16px;">1、首先必須關(guān)閉吐出管路上的閘閥。</span></div> <div> <span style="font-size:16px;">2、使泵停止轉動(dòng)。</span></div> <div> <span style="font-size:16px;">3、在寒冷季節，應將泵體內的儲液和軸承體冷卻室內的水放空，以防凍裂機泵部件。</span></div> <div> </div> <div> <span style="font-size:16px;">三、預防自吸離心泵進(jìn)氣的措施</span></div> <div> <span style="font-size:16px;">1、自吸泵的安裝位置應盡量接近水面，保證在水位下降時(shí)不吸進(jìn)空氣。</span></div> <div> <span style="font-size:16px;">2、安裝吸水管路時(shí)，進(jìn)水橫管應向來(lái)水方向稍往下傾斜或者水平安裝，進(jìn)水管任何一點(diǎn)都不得高于水泵進(jìn)水口，否則管內空氣排除不盡。</span></div> <div> <span style="font-size:16px;">3、要防止填料涵漏氣。填料涵的松緊應合適，如果過(guò)松，應上緊填料壓蓋；填料損壞、失效，應及時(shí)更換；填料涵蓋處的水封管堵塞并發(fā)熱，將引起填料涵蓋漏氣，應清洗水封管。</span></div> <div> <span style="font-size:16px;">4、用法蘭盤(pán)連接的進(jìn)水管安裝前，要將2個(gè)法蘭盤(pán)相接觸的平面清理干凈，中間加1個(gè)3~5mm厚的膠墊，要對稱(chēng)、分幾次逐步地將螺栓擰緊。</span></div> <div> <span style="font-size:16px;">5、自吸水泵底閥要有足夠的淹沒(méi)深度，從閥門(mén)平面算起淹沒(méi)深度應等于底閥外徑的1.5~2倍,至少不小于0.5m。如果淹沒(méi)太淺，容易形成旋渦，從而吸進(jìn)空氣，產(chǎn)生汽蝕并損壞葉輪和泵殼。如果發(fā)現水泵運行時(shí)進(jìn)水位下降很快，可以在水面上放幾塊木板，以減少旋渦，防止空氣進(jìn)入泵殼。</span></div> <div> <span style="font-size:16px;">6、自吸泵體上設有放氣螺塞，為便于放氣，可用螺紋尺寸相同的水龍頭代替放氣螺塞，放氣時(shí)打開(kāi)水龍頭即可。</span></div> <div> <span style="font-size:16px;">7、自吸泵吸水口處的真空度是有限的，真空度過(guò)大，易使泵內水汽化，對自吸水泵工作不利。所以，各自吸水泵都有其最大允許吸程，一般均在3~8.5m之間,安裝時(shí)應控制在此范圍。</span></div> <div> <span style="font-size:16px;">8、注意排氣。在啟動(dòng)自吸水泵前應加足引水，以排除自吸水泵內的空氣；平時(shí)應定期打開(kāi)泵蓋上的放氣螺塞，排除積聚在里面的空氣。</span></div> </p> <div id="nmo4xga" class="page"> <p>上一篇：<a href='/xinwenzixun/223.html'>調節閥功能術(shù)語(yǔ)和特性總匯</a> </p> <p>下一篇：<a href='/xinwenzixun/229.html'>現存污水處理廠(chǎng)存在的問(wèn)題</a> </p> <a href="javascript:void(0);" title="折帶式過(guò)濾機" class="back" onClick="javascript:history.back(-1);">返回</a> </div> </div> </div> </div>  </div> </div>  <div id="gvuopfj" class="footclear"></div> <div id="f40rww4" 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