管(guǎn)道離心泵(bèng)的安裝技(jì)術關(guān)鍵在(zài)于确定離(lí)心泵安(ān)裝(zhuāng)高度即吸(xī)程。這個高(gāo)度是(shì)指水源水(shuǐ)面到
離心泵
葉輪中心線(xiàn)的垂(chuí)直距(jù)離(lí)，它與允(yǔn)許吸(xī)上真空高度不能混爲一(yī)談，水泵産品說明書(shū)或銘(míng)牌上(shàng)标示的允(yǔn)許(xǔ)吸(xī)上真空高度是(shì)指水泵(bèng)進水口(kǒu)斷面(miàn)上(shàng)的真空(kōng)值，而且是(shì)在1标(biāo)準大氣壓下、水溫20℃情況(kuàng)下(xià)，進行試驗(yàn)而測定得(dé)的。它(tā)并沒(méi)有考慮吸水管道配(pèi)套以後的(de)水流狀況。而水泵安裝高度應該是允許吸上真空(kōng)高(gāo)度(dù)扣除(chú)了吸(xī)水管道損失(shī)揚(yáng)程以後(hòu)，所(suǒ)剩下的那部分數值(zhí)，它要克服實際(jì)地形(xíng)吸水(shuǐ)高度(dù)。水泵安(ān)裝高度(dù)不能(néng)超過計算(suàn)值，否則，離(lí)心泵将會(huì)抽不上水(shuǐ)來(lái)。另(lìng)外，影響計算值(zhí)的(de)大小是(shì)吸水管道(dào)的阻力損(sǔn)失(shī)揚程，因(yīn)此，宜采用短的(de)管路布置(zhì)，并盡(jìn)量少裝彎頭等(děng)配件，也可(kě)考慮(lǜ)适當配大(dà)一些(xiē)口徑(jìng)的(de)水管，以(yǐ)減管内流速。應(yīng)當指出，管(guǎn)道離(lí)心泵(bèng)安裝地點的高(gāo)程(chéng)和水溫(wēn)不同于(yú)試驗條(tiáo)件時(shí)，如當地海(hǎi)拔300米以上或被(bèi)抽水的水溫超過20℃，則計算(suàn)值要(yào)進行(háng)修(xiū)正(zhèng)。即不同海(hǎi)拔高(gāo)程處(chù)的大氣(qì)壓力和(hé)高于20℃水溫(wēn)時的(de)飽和(hé)蒸(zhēng)汽(qì)壓力(lì)。但是(shì)，水溫爲20℃以(yǐ)下時，飽和蒸汽(qì)壓力可(kě)忽略不計。從管(guǎn)道(dào)安裝技術上(shàng)，吸水管(guǎn)道要求有嚴格(gé)的密(mì)封性(xìng)，不能(néng)漏氣、漏水，否則将會(huì)破壞離心泵進水口處的(de)真空度，使(shǐ)離心(xīn)泵出(chū)水量減少(shǎo)，嚴重時甚(shèn)至抽(chōu)不上水來(lái)。因此(cǐ)，要認真地做好(hǎo)
離心(xīn)泵
管道的(de)接口工作，保證(zhèng)管道(dào)連接的施(shī)工質量(圖(tú)\文
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)。
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.
