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                當前位置:首頁 > 新聞中心 > 行業新聞
                自吸泵產生汽蝕的原因
                來源:www.yvettesblogs.com? 發布時間:2013-04-11 14:41

                自吸泵產生汽蝕的原因是泵內局部壓力低于水的飽和蒸汽壓力,或者說汽化是形成汽蝕的先決條件。
                自吸泵產生汽蝕的原因大致有以下幾個方面:
                1、自吸泵安裝高度過高。隨著自吸泵安裝高度的增加,泵進口處的真空度增加,致使泵內壓力降得過低。
                2、自吸泵實際工況偏離設計工況點較遠。當水泵在非設計工況下運行時,也可能在葉輪下方產生自下而上的帶狀漩渦(稱渦帶)。當渦帶中心壓力下降到飽和蒸汽壓力時,該渦帶即成為汽蝕帶。當此渦帶伸入泵內時,不僅能促進和加重水泵某些部件的汽蝕,而且還會引起機組的強烈振動,并發出轟鳴聲。
                3、自吸泵的進水條件不好。對采用肘形進水流道的泵,由于彎道流速壓力分布不均,造成自吸泵葉輪進口流速分布也不均勻;進水池產生漩渦會使進入自吸泵的水預旋或將空氣帶入,同樣造成葉輪進口處流速、壓力分布不均勻,從而導致汽穴及汽蝕的發生。據國外汽蝕試驗資料指出,水中含氣量越大,則汽蝕開始得越早。
                4、自吸泵安裝地點的海拔較高,則自吸泵輸送的水溫度較高。在高海拔地區,大氣壓力較低,會使自吸泵吸入口的壓力也相應較低;而水溫較高,飽和蒸汽壓力就會越大,水就越容易汽化。
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