MD450-60*3,20SH-6，呂梁耐磨離心泵，長沙水泵廠配件

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MD450-60*3多級離心泵,20SH-6中開泵進水管和泵體內有空氣
  (1)有些用戶在水泵啟動前未灌滿足夠的水;有時看上去灌的水已從放氣孔溢出，但未轉動泵軸交空氣完全排出，致使少許空氣還殘留在進水管或泵體中。
  (2)與水泵接觸的進水管的水平段逆水流方向應用0.5%以上的下降坡度，連接水泵進口的一端為最高，不要完全水平。如果向上翹起，進水管內會存留空氣，降低了水管和水泵中的真空度，影響吸水。
  (3)離心泵的填料因長期使用已經(jīng)磨損或填料壓得過松，造成大量的水從填料與泵軸軸套的間隙中噴出，其結果是外部的空氣就從這些間隙進入水泵的內部，影響了提水。
  (4)進水管因長期潛在水下，管壁腐蝕出現(xiàn)孔洞，水泵工作后水面不斷下降，當這些孔洞露出水面后，空氣就從孔洞進入了進水管。
  (5)進水管彎管處出現(xiàn)裂痕，進水管與水泵連接處出現(xiàn)微小的間隙，都有可能使空氣進入進水管。
  水泵轉速過低
  (1)人為的因素。有相當一部分用戶因原配電動機損壞，就隨意配上另一臺電動機帶動，結果造成了流量少、揚程低甚至抽不上水的后果。
  (2)傳動帶磨損。有許多大型離水泵采用帶傳,因長期使用,傳動帶磨損而松動,出現(xiàn)打滑現(xiàn)象，從而降低了水泵的轉速。
  (3)安裝不當。兩帶輪中心距太小或兩軸不太平行，傳動帶緊邊安裝到上面，致使包角太小，兩帶輪直徑計算差錯以及聯(lián)軸傳動的水泵兩軸偏心距較大等，均會造成水泵轉速的變化。
  (4)水泵本身的機械故障。葉輪與泵軸緊固螺母松脫或泵軸變形彎曲，造成葉輪多移，直接與泵體摩擦，或軸承損壞，都有可能降低水泵的轉速。
  (5)動力機維修不當。電動機因繞組燒毀，而失磁，維修中繞組匝數(shù)、線徑、接線方法的改變，或維修中故障未徹底排除因素也會使水泵轉速改變。
  水泵吸程太大
  有些水源較深，有些水源的外圍地勢較平坦處，而忽略了水泵的容許吸程，因而產生了吸水少或根本吸不上水的結果。要知道水泵吸水口處能建立的真空度是有限度的，真空時的吸程約為10米水柱高，而水泵不可能建立的真空。而且真空度過大，易使泵內的水氣化，對水泵工作不利。所以各種離心泵都有其最大容許吸程，一般在3～8.5米之間，安裝水泵時切不可只圖方便簡單。
  水流的進出水管中的阻力損失過大
  有些用戶經(jīng)過測量，雖然蓄水池或水塔到水源水面的垂直距離還略小于水泵揚程，但還是提水量小或提不上水。其原因常是管道太長、水管彎道多，水流在管道中阻力損失過大。其原因常是管道太長、水管彎道多，水流在管道中阻力損失過大。一般情況下90度彎管比120度彎管阻力大，每一90度彎管揚程損失約0.5～1米，每20米管道的阻力可使揚程損失約1米。此外，有部分用戶還隨意水泵進出管的管徑，這些對揚程也有一定的影響。
  離心泵提不上水的其他因素的影響
  1)底閥打不開。通常是由于水泵擱置時間太長，底閥墊圈被粘死，無墊圈的底閥可能會銹死。
  2)底閥濾器網(wǎng)被堵塞;或底閥潛在水中污泥層中造成濾網(wǎng)堵塞。
  3)葉輪磨損嚴重。葉輪葉片經(jīng)長期使用而磨損，影響了水泵性能。
  4)閘閥或止回閥有故障或堵塞會造成流量減小甚至抽不上水。
  5)出口管道的泄漏也會影響提水量。

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