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離心泵?的容積損失有密封環漏泄損失、平衡機構漏泄損失和級間漏泄損失。在葉輪入口處,設有密封環,在離心泵工作時,由于密封環兩側存在著壓力差,一側近似為葉輪出口壓力,一側為葉輪入口壓力,所以始終會有一部分液體從葉輪出口向葉輪入口漏泄。這部分液體在葉輪里獲得了能量,但液體并未送出,這樣就減少了水泵的供水量。漏泄液體的能量全部用到克服密封環阻力上了。
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