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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=176"></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 style="padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px; white-space: normal;"><span style="font-family:宋體;padding: 0px; margin: 0px auto;">液壓系統的功率損失一方面會造成能量上的損失，使系統的總效率下降，另一方面，損失掉的這一部分能量將會轉變成熱能，使液壓油的溫度升高，油液變質，導致液壓設備出現故障。因此，設計液壓系統時，在滿足使用要求的前提下，還應充分考慮降低系統的功率損失。</span><span style="font-family:宋體;padding: 0px; margin: 0px auto;"></span></p><p><span style="font-family:宋體;padding: 0px; margin: 0px auto; font-family: 宋體; line-height: 28.8px;"></span></p><p style="padding: 0px; margin: 0px auto;">首先，從動力源——泵的方面來考慮，考慮到執行器工作狀況的多樣化，有時系統需要大流量，低壓力；有時又需要小流量，高壓力。所以選擇限壓式變量泵為宜，因為這種類型的泵的流量隨系統壓力的變化而變化。當系統壓力降低時，流量比較大，能滿足執行器的快速行程。當系統壓力提高時流量又相應減小，能滿足執行器的工作行程。這樣既能滿足執行器的工作要求，又能使功率的消耗比較合理。</p><p style="padding: 0px; margin: 0px auto;">其次，如果執行器具有調速的要求，那么在選擇調速回路時，既要滿足調速的要求，又要盡量減少功率損失。常見的調速回路主要有：節流調速回路，容積調速回路，容積節流調速回路。其中節流調速回路的功率損失大，低速穩定性好。而容積調速回路既無溢流損失，也無節流損失，效率高，但低速穩定性差。如果要同時滿足兩方面的要求，可采用差壓式變量泵和節流閥組成的容積節流調速回路，并使節流閥兩端的壓力差盡量小，以減小壓力損失。</p><p style="padding: 0px; margin: 0px auto;">第三，液壓油流經各類液壓閥時不可避免的存在著壓力損失和流量損失，這一部分的能量損失在全部能量損失中占有較大的比重。因此，合理選擇液壓器，調整壓力閥的壓力也是降低功率損失的一個重要方面。流量閥按系統中流量調節范圍選取并保證其Z小穩定流量能滿足使用要求，壓力閥的壓力在滿足液壓設備正常工作的情況下，盡量取較低的壓力。</p><p style="padding: 0px; margin: 0px auto;">第四，合理選擇液壓油。液壓油在管路中流動時，將呈現出黏性，而黏性過高時，將產生較大的內摩擦力，造成油液發熱，同時增加油液流動時的阻力。當黏性過低時，易造成泄漏，將降低系統容積效率，因此，一般選擇黏度適宜且黏溫特性比較好的油液。另外，當油液在管路中流動時，還存在著沿程壓力損失和局部壓力損失，因此設計管路時盡量縮短管道，同時減少彎管。</p><p></p><p style="white-space: normal;"><strong><span 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