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離心泵的關鍵安裝技術

管道離心泵的安(ān)裝技術關鍵在于确定離(lí)心泵安裝高度即吸程。這個高度(dù)是指水源水面到 離心泵(bèng) 葉輪中心線的垂(chuí)直距(jù)離(lí)，它(tā)與允許吸上真(zhēn)空高度不能(néng)混爲一(yī)談，水泵産品說明書(shū)或銘牌上标示(shì)的允許吸上真空高度是指水泵進(jìn)水口斷面上的真空值，而且是在1标(biāo)準大氣壓下、水(shuǐ)溫20℃情況下(xià)，進行試驗而測定得的。它并沒有考慮吸水管道配套以後的水流狀(zhuàng)況。而水泵安(ān)裝高度應該是允許吸上真空高度(dù)扣除了吸水管道(dào)損失揚程以後，所剩下的那部分數值(zhí)，它要(yào)克服實際(jì)地形吸水高度。水泵安裝高度(dù)不能超過計算值，否則，離心泵将(jiāng)會抽不上水來。另外，影響計算值的(de)大小是(shì)吸水管道的阻力損失揚程，因(yīn)此，宜采用短的管路布置，并盡量少裝彎(wān)頭等配件，也可考(kǎo)慮(lǜ)适當配大一些(xiē)口徑的水管，以減管内流速。應當指出，管道離(lí)心泵安(ān)裝地點的高程和水(shuǐ)溫不同于試驗(yàn)條件時，如當地海(hǎi)拔300米以上或被抽水的水溫超(chāo)過20℃，則計算值要進行修正。即不同海拔高程處的大氣壓力和(hé)高于20℃水溫時的飽和蒸汽壓力。但是，水溫爲20℃以下時，飽和蒸汽壓(yā)力可忽略不(bú)計。從管道(dào)安裝技術上，吸水管道要求有嚴格(gé)的密封性，不能漏氣、漏水，否則(zé)将會破壞(huài)離心泵進水口處的(de)真空度，使離心泵出水量減少，嚴重時甚至抽不上水來。因此(cǐ)，要認真地做好 離心(xīn)泵 管道的接口工作，保證管道(dào)連接的施工質量(圖(tú)\文 xiaojikuaipao.top/index.asp )。
中譯英：
Pipeline centrifugal pump / installation technology is the key to determine the suction centrifugal pump installation height. This highly refers to the water surface to the centrifugal pump impeller centerline vertical distance, and it allows suction vacuum height can not be confused, pump product brochures or nameplate marked on the allowable suction vacuum pump inlet section refers to the value of the vacuum on, and was in the 1standard atmospheric pressure, water temperature 20℃test and measurement, the. It does not take into account the suction pipe supporting later flow condition. And the pump mounting height should be allowed to deduct the suction vacuum suction piping loss of lift, the remaining portion of numerical value, it is to overcome the real terrain suction height. Pump mounting height should not exceed the calculated value, otherwise, centrifugal pump will be pumped to not Sheung shui. In addition, affect the calculation value is the size of the suction piping resistance loss of lift, therefore, should adopt the most short circuit arrangement, and minimize the loaded elbow parts, may also be considered appropriate with a larger caliber pipe, to reduce the flow velocity in the tube. It should be noted, the pipeline centrifugal pump installation site of the elevation and water temperature is different from the test conditions, such as local altitude 300 meters of above or by pumping water temperature is over 20 ℃, then the calculation of value must be amended. The different elevation at atmospheric pressure and temperature of above 20 DEG C saturated steam pressure. However, the water temperature is 20℃, the saturation vapor pressure is negligible. From the pipeline installation technique, water pipes required strict sealing, not leakage, water leakage, otherwise it will destroy the centrifugal pump inlet vacuum degree, the centrifugal pump to reduce the amount of water, serious when can't even afford Sheung shui. Therefore, to seriously do a good job of centrifugal pump pipeline interface, ensure the construction quality of pipe connection.