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    新聞資訊
    液壓泵工作原理
    來源:: 時間:2017-08-16

    上海程翔液壓設備維修服務有限公司跟您分享液壓泵工作原理知識! 是為液壓傳動提供加壓液體的一種液壓元件,是泵的一種。它的功能是把動力機(如電動機和內燃機等)的機械能轉換成液體的壓力能。圖中為單柱塞泵的工作原理。凸輪由電動機帶動旋轉。當凸輪推動柱塞向上運動時,柱塞和缸體形成的密封體積減小,油液從密封體積中擠出,經單向閥排到需要的地方去。當凸輪旋轉至曲線的下降部位時,彈簧迫使柱塞向下,形成一定真空度,油 箱中的油液在大氣壓力的作用下進入密封容積。

    凸輪使柱塞不斷地升降,密封容積周期性地減小和增 大,泵就不斷吸油和排油。 性能參數 液壓泵是液壓系統的動力元件,其功用是給液壓系統提供壓力油,從能量轉換角度講,它將是原動機(如發動機)輸出的機械能轉換為便于輸送的液體的壓力能。液壓馬達則屬于執行元件,它能將輸入液體的壓力能轉換為輸出軸轉動的機械能,用來拖動負載做功。根據結構形式,液壓泵與液壓馬達具體可分為齒輪式、葉片式、柱塞式等類型。 

    1.液壓泵壓力 液壓泵工作壓力是指泵(或馬達)在實際工作時輸出(或輸入)油液的壓力,由外負載決定。 額定壓力是指在正常工作條件下,按試驗標準規定能連續運轉的最高壓力。其大小受壽命的限制,若超過額定壓力工作,泵(或馬達)的使用壽命將會比設計的壽命短。當工作壓力大于額定壓力時稱超載。 

    2.轉速 工作轉速是指泵(或馬達)在工作時的實際轉動速度。 額定轉速是指在額定壓力下,能連續長時間正常運轉的最高轉速。若泵超過額定轉速工作將會造成吸油不足,產生振動和大的噪聲,零件會遭受氣蝕損傷,壽命降低。 最低穩定轉速是指馬達正常運轉所允許的最低轉速。在此轉速下,馬達不出現爬行現象。 

    3.排量、流量 排量是指泵(或馬達)每轉一周,由密封容腔幾何尺寸變化而得的排出(或輸入)液體的體積,常用單位是ml/r(毫升/轉)。排量可以通過調節發生變化的成為變量泵(或變量馬達),排量不能變化的成為定量泵(或定量馬達)。 

    實際流量是指泵(或馬達)工作時出口處(或進口處)的流量。由于泵本身存在內泄漏,其實際流量小于理論流量。由于馬達本身也存在內泄漏,要實現指定轉速,為補償泄漏量,其輸入實際流量必須大于理論流量。 

    4.效率 容積效率,對液壓泵是指其實際流量與理論流量的比值。對液壓馬達是指其理論流量與實際流量的比值。 

    機械效率,對液壓泵是指其理論轉矩與實際輸入轉矩的比值。對液壓馬達其實際輸出的轉矩為理論轉矩克服摩擦力后的轉矩,因此其機械效率為實際輸出轉矩與理論轉矩的比值。 

    總效率是指泵(或馬達)的輸出功率與輸入功率的比值。總效率等于容積效率與機械效率的乘積。

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