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常見問題
離心泵的安裝高度Hg計…
管道離心泵安裝地點的高程和水溫不同于試驗條件時…
益泵泵業為您剖析ISW臥…
ISW臥式管道離心泵采用電機泵同軸,機電一體化程度…

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[ 來自:不詳  閱讀:   時間:2018.09.21 ]
管道離心泵安裝地點的高程和水溫不同于試驗條件時,如當地海拔300米以上或被抽水的水溫超過20攝氏度,則計算值要進行修正。即不同海拔高程處的大氣壓力和高于20攝氏度水溫時的飽和蒸汽壓力。

管道離心泵的安裝技術關鍵在于確定水泵安裝高度(即吸程)。這個高度是指水源水面到水泵葉輪中心線的垂直距離,它與允許吸上真空高度不能混為一談,水泵產品說明書或銘牌上標示的允許吸上真空高度是指水泵進水口斷面上的真空值,而且是在1標準大氣壓下、水溫20攝氏度情況下,進行試驗而測定得的。它并沒有考慮吸水管道配套以后的水流狀況。而水泵安裝高度應該是允許吸上真空高度扣除了吸水管道損失揚程以后,所剩下的那部分數值,它要克服實際地形吸水高度。水泵安裝高度不能超過計算值,否則,水泵將會抽不上水來。另外,影響計算值的大小是吸水管道的阻力損失揚程,因此,宜采用最短的管路布置,并盡量少裝彎頭等配件,也可考慮適當配大一些口徑的水管,以減管內流速。

lol联赛竞猜YINGDANGZHICHU,GUANDAOLIXINBENGANZHUANGDIDIANDEGAOCHENGHESHUIWENBUTONGYUSHIYANTIAOJIANSHI,RUDANGDIHAIBA300MIYISHANGHUOBEICHOUSHUIDESHUIWENCHAOGUO20SHESHIDU,ZEJISUANZHIYAOJINXINGXIUZHENG。JIBUTONGHAIBAGAOCHENGCHUDEDAQIYALIHEGAOYU20SHESHIDUSHUIWENSHIDEBAOHEZHENGQIYALI。DANSHI,SHUIWENWEI20SHESHIDUYIXIASHI,BAOHEZHENGQIYALIKEHULVEBUJI。

CONGGUANDAOANZHUANGJISHUSHANG,XISHUIGUANDAOYAOQIUYOUYANGEDEMIFENGXING,BUNENGLOUQI、LOUSHUI,FOUZEJIANGHUIPOHUAISHUIBENGJINSHUIKOUCHUDEZHENKONGDU,SHISHUIBENGCHUSHUILIANGJIANSHAO,YANZHONGSHISHENZHICHOUBUSHANGSHUILAI。YINCI,YAORENZHENDIZUOHAOGUANDAODEJIEKOUGONGZUO,BAOZHENGGUANDAOLIANJIEDESHIGONGZHILIANG。

離心泵的安裝高度Hg計算:

允許吸上真空高度Hs是指泵入口處壓力p1可允許達到的最大真空度。

lol联赛竞猜ERSHIJIDEYUNXUXISHANGZHENKONGGAODUHsZHIBINGBUSHIGENJUSHIJISUANDEZHI,ERSHIYOUBENGZHIZAOCHANGJIASHIYANCEDINGDEZHI,CIZHIFUYUBENGYANGBENZHONGGONGYONGHUCHAYONG。WEIYINGZHUYIDESHIBENGYANGBENZHONGGEICHUDEHsZHISHIYONGQINGSHUIWEIGONGZUOJIEZHI,CAOZUOTIAOJIANWEI20℃JIJIYALIWEI1.013×105PaSHIDEZHI,DANGCAOZUOTIAOJIANJIGONGZUOJIEZHIBUTONGSHI,XUJINXINGHUANSUAN。

(1) SHUSONGQINGSHUI,DANCAOZUOTIAOJIANYUSHIYANTIAOJIANBUTONG,KEYIXIASHIHUANSUAN

lol联赛竞猜Hs1=Hs+(Ha-10.33) - (Hυ-0.24)

(2) SHUSONGQITAYETIDANGBEISHUSONGYETIJIFANPAIRENWUTIAOJIANJUNYUSHIYANTIAOJIANBUTONGSHI,XUJINXINGLIANGBUHUANSUAN:DIYIBUYISHANGSHIJIANGYOUBENGYANGBENZHONGCHACHUDEHs1;DIERBUYIXIASHIJIANGHs1HUANSUANCHENGH?s

2 QISHIYULIANGΔh

DUIYUYOUBENG,JISUANANZHUANGGAODUSHIYONGQISHIYULIANGΔhLAIJISUAN,JIBENGYUNXUXIYETIDEZHENKONGDU,YIJIBENGYUNXUDEANZHUANGGAODU,DANWEIYONGMI。YONGQISHIYULIANGΔhYOUYOUBENGYANGBENZHONGCHAQU,QIZHIYEYONG20℃QINGSHUICEDING。RUOSHUSONGQITAYETI,YIXUJINXINGXIAOZHENG,XIANGCHAYOUGUANSHUJI。

lol联赛竞猜XICHENG=BIAOZHUNDAQIYA(10.33MI)-QISHIYULIANG-ANQUANLIANG(0.5MI)

lol联赛竞猜BIAOZHUNDAQIYANENGYAGUANLUZHENKONGGAODU10.33MI。

lol联赛竞猜LIRU:MOUBENGBIXUQISHIYULIANGWEI4.0MI,QIUXICHENGΔh?

JIE:Δh=10.33-4.0-0.5=5.83MI

CONGANQUANJIAODUKAOLV,BENGDESHIJIANZHUANGGAODUZHIYINGXIAOYUJISUANZHI。DANGJISUANZHIHgWEIFUZHISHI,SHUOMINGBENGDEXIRUKOUWEIZHIYINGZAIZHUCAOYEMIANZHIXIA。

LI2-3  MOULIXINBENGCONGYANGBENSHANGCHADEYUNXUXISHANGZHENKONGGAODUHs=5.7m。YIZHIXIRUGUANLUDEQUANBUZULIWEI1.5mH2O,DANGDIDAQIYAWEI9.81×104Pa,YETIZAIXIRUGUANLUZHONGDEDONGYATOUKEHULVE。SHIJISUAN:

(1) SHUSONG20℃QINGSHUISHIBENGDEANZHUANG;

lol联赛竞猜(2) GAIWEISHUSONG80℃SHUISHIBENGDEANZHUANGGAODU。

JIE:(1) SHUSONG20℃QINGSHUISHIBENGDEANZHUANGGAODU

YIZHI:Hs=5.7m

Hf0-1=1.5m

u12/2g≈0

DANGDIDAQIYAWEI9.81×104Pa,YUBENGCHUCHANGSHIDESHIYANTIAOJIANJIBENXIANGFU,SUOYIBENGDEANZHUANGGAODUWEIHg=5.7-0-1.5=4.2 m。

lol联赛竞猜(2) SHUSONG80℃SHUISHIBENGDEANZHUANGGAODU

SHUSONG80℃SHUISHI,BUNENGZHIJIECAIYONGBENGYANGBENZHONGDEHsZHIJISUANANZHUANGGAODU,XUANXIASHIDUIHsSHIXINGHUANSUAN,JI

lol联赛竞猜Hs1=Hs+(Ha-10.33) - (Hυ-0.24)

lol联赛竞猜YIZHIHa=9.81×104Pa≈10mH2O,YOUFULUCHADE80℃SHUIDEBAOHEZHENGQIYAWEI47.4kPa。

lol联赛竞猜Hv=47.4×103 Pa=4.83 mH2O

lol联赛竞猜Hs1=5.7+10-10.33-4.83+0.24=0.78m

lol联赛竞猜JIANGHs1ZHIDAIRU SHIZHONGQIUDEANZHUANGGAODU

lol联赛竞猜Hg=Hs1-Hf0-1=0.78-1.5=-0.72m

lol联赛竞猜HgWEIFUZHI,BIAOSHIBENGYINGANZHUANGZAISHUICHIYEMIANYIXIA,ZHISHAOBIYEMIANDI0.72m。

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