管道離心(xīn)泵的安裝(zhuāng)技術(shù)關鍵在于(yú)确定(dìng)離心泵安(ān)裝高(gāo)度即(jí)吸程。這個(gè)高度(dù)是指(zhǐ)水源(yuán)水面到(dào) 離心泵 葉輪(lún)中心(xīn)線的(de)垂直(zhí)距離，它與(yǔ)允許吸(xī)上(shàng)真空(kōng)高度不能混爲(wèi)一談，水泵産品(pǐn)說明書或銘牌(pái)上标示的允許吸上(shàng)真空高度(dù)是指水(shuǐ)泵(bèng)進水(shuǐ)口斷面上的真(zhēn)空值，而且(qiě)是在(zài)1标準大氣壓下(xià)、水溫20℃情況下，進行試(shì)驗而測(cè)定(dìng)得的。它并(bìng)沒有(yǒu)考慮吸(xī)水管道(dào)配套(tào)以後(hòu)的水(shuǐ)流(liú)狀(zhuàng)況。而水泵(bèng)安裝高度(dù)應該(gāi)是允許(xǔ)吸(xī)上真(zhēn)空高度(dù)扣除了(le)吸水(shuǐ)管道(dào)損失(shī)揚程以後，所剩(shèng)下的(de)那部分(fèn)數(shù)值，它要克(kè)服實際地(dì)形吸水高(gāo)度。水泵安裝高度不(bú)能超(chāo)過計(jì)算值，否則，離心(xīn)泵将會抽不上(shàng)水來。另外，影響(xiǎng)計算值的(de)大小(xiǎo)是(shì)吸水管道的(de)阻力損失揚程(chéng)，因此，宜采(cǎi)用短(duǎn)的管(guǎn)路布(bù)置，并(bìng)盡量少裝彎頭(tóu)等配(pèi)件，也可考(kǎo)慮适(shì)當配大(dà)一(yī)些口徑的水管(guǎn)，以減(jiǎn)管(guǎn)内流速(sù)。應當(dāng)指出，管道離心泵(bèng)安裝地點的高程和水(shuǐ)溫不同于(yú)試驗條件時(shí)，如當地(dì)海拔300米以(yǐ)上或被抽(chōu)水的水溫(wēn)超過20℃，則(zé)計算值要進(jìn)行修正。即(jí)不同海(hǎi)拔高程(chéng)處的(de)大氣壓力(lì)和高于20℃水溫時(shí)的飽和(hé)蒸汽壓(yā)力。但是(shì)，水溫爲20℃以下時，飽和蒸(zhēng)汽壓力可(kě)忽略(luè)不計。從管(guǎn)道安(ān)裝技術上，吸水(shuǐ)管道要(yào)求有嚴(yán)格的密(mì)封(fēng)性，不能漏氣、漏水，否(fǒu)則将會破壞離(lí)心泵進水口處(chù)的真空(kōng)度，使離(lí)心泵(bèng)出水量減少，嚴(yán)重時(shí)甚至抽不上水來。因(yīn)此，要認(rèn)真地做(zuò)好 離(lí)心泵 管道(dào)的接口工(gōng)作，保證管(guǎn)道連(lián)接的施(shī)工(gōng)質量(liàng)(圖\文(wén) xiaojikuaipao.top/index.asp )。
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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.