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class="info_title clearfix"> <h3 class="title_bar"> 發布日期：<span>2014-08-07</span> 作者：<span></span> 點擊：<span><script src="http://www.shunfanmuye.com/data/include/newshits.php?id=174"></script></span> </h3> <div class="share">  <div class="bdsharebuttonbox"> <a href="#" class="bds_more" data-cmd="more"></a> <a href="#" class="bds_qzone" data-cmd="qzone"></a> <a href="#" class="bds_tsina" data-cmd="tsina"></a> <a href="#" class="bds_tqq" data-cmd="tqq"></a> <a href="#" class="bds_renren" data-cmd="renren"></a> <a href="#" class="bds_weixin" data-cmd="weixin"></a> </div> <script> window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdPic":"","bdStyle":"0","bdSize":"16"},"share":{},"image":{"viewList":["qzone","tsina","tqq","renren","weixin"],"viewText":"分享到：","viewSize":"16"},"selectShare":{"bdContainerClass":null,"bdSelectMiniList":["qzone","tsina","tqq","renren","weixin"]}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)]; </script>  </div> </div> <div class="content"><p><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">1、對柴油機的影響及對策</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(1)功率下降</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">空氣含氧量降低，柴油機功率下降，可采用高原型增壓柴油機，以確保在海拔5000m的高原上工作時功率不下降(即使下降也不會超過3%)。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(2)橡膠老化</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">紫外線照射強烈加速橡膠件老化，低溫使材料變脆，強度降低。應加強對外露軟管的防護。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(3)柴油劣化</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">氣壓低柴油易劣化，可用加壓油箱，選用-30號柴油。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(4)配件耗損量大</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">海拔每升高1000m，柴油機功率將下降13%左右，油耗會增加6%左右，機器使用4個月的配件損耗量相當于內地兩年的損耗量，因此柴油機必須加裝渦輪增壓器。但由于海拔升高后低氣壓會使渦輪的膨脹比增加。膨脹比和渦輪排氣溫度的增加將使渦輪耗功增加、轉速上升。資料顯示，在海拔3800m時，增壓器轉速會超過額定轉速的16%，對其使用極為不利。為此，可以加裝柴油機增壓空氣中冷器降低壓氣機出口溫度及汽缸熱負荷，以提高柴油機的有效功率和使用壽命。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(5)冷卻效果變差</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">高原地區空氣密度小，柴油機風扇的體積流量不變但質量流量卻大為降低，冷卻效果變差，導致柴油機不能正常工作。風冷機受進氣量和冷卻風量的雙重影響，進氣量又受空氣密度影響，工況更惡劣。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">此時應當采用密封水散熱器，對冷卻系統加壓或采用高沸點的冷卻液；改進風冷機的風扇設計或適當提高其轉速增加風量和風壓；增加“附加水散熱器”，增大水散熱器散熱面積和水泵流量。同時，使冷卻水與蒸汽分離，排除冷卻系統內的空氣，減輕水泵汽蝕現象。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(6)啟動困難</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">高寒地區使用的柴油、機油、液壓油的黏度增大，蓄電池(化學反應不完全)容量下降較快，機器難以啟動?？刹扇∪缦麓胧?/span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">①選用低溫油料。一般以高于凝點10℃左右為宜。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">②選用大容量蓄電池并對其采取保溫措施。如將其安裝在排氣管上方，利用柴油機排氣熱量對蓄電池進行保溫。此外，高原地區夏季電解液蒸發量增大，低氣壓又使蓄電池電解液消耗量增大。為此，可改進蓄電池液孔塞及蓄電池槽、蓋的密封。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">③增設離合器。在嚴寒條件下使用的液壓油與潤滑油凝點低、黏度大、流動性差，增加了啟動阻力。為此可在柴油機飛輪與變矩器之間增設離合器，啟動時使柴油機與傳動系統分離，減小啟動阻力。據資料介紹，液壓系統的液壓油在-40℃、油箱溫度在-14℃時，根本無法啟動；而當液壓泵(或變矩器)與柴油機分離后，即可順利啟動。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">④加裝柴油機余熱保溫啟動裝置。當機器停止作業后，將柴油機散熱器內的熱水貯存在用保溫材料制成的貯水器內，待第二天啟動時將熱水通過手搖泵、加熱器、油底殼注入至散熱器，對柴油機機體和機油進行預熱。若一次啟動不成功，可再將冷卻水回收、加熱，再次啟動。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(7)濾清效果差</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">高原地區風沙大、風速大，使空氣濾清器進氣阻力大，濾清效果差。為此，可采用專用型高原濾清器，并在濾清器上安裝堵塞報警指示器，適日寸監控、維護和保養。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">2、對液壓系統的影響及對策</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">易使液壓油變稠，影響液壓件潤滑，機件卡死，液壓馬達易發生脆性破壞；油箱壓力變低，液壓泵吸油困難。應采取如下措施：</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(1)增加預熱回路，在機器運轉前對液壓件進行預熱。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(2)采用預壓油箱，保證液壓泵吸油充分。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(3)在冷卻回路中加旁通閥(單向閥)控制。當油流阻力達到一定值時，旁通閥打開，液壓油不經冷卻器而由旁通閥流回油箱，減小啟動阻力，保證液壓件潤滑。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(4)在液壓回路中增加測試接口，便于監測。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">3、改造駕駛室</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">高寒地區會使駕駛室防寒、隔音性能變差，且容易在玻璃上形成霜凍，影響視線(駕駛室門窗縫隙滲出的熱量，約占總熱量的43%)。改進措施如下：</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(1)在駕駛室側壁、項蓋、地板等處鋪設吸聲系數較大的微孔泡沫塑料或泡沫海棉作隔熱、隔聲層，框縫加海棉橡膠密封，以達到保溫隔聲的效果。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; background-color: rgb(238, 247, 254);">(2)駕駛室采用雙層玻璃。</span><br style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"/><span style="font-family: 宋體; line-height: 28.8px; 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