皇冠即时比分

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双螺杆泵的选型技巧

水泵原理 卧泉泵业 776浏览 0评论

泵的选型包括性能参数的选择和泵结构型式的选择,泵结构型式的选择参见双螺杆泵的结构形式介绍。

XINGNENGCANSHUDEXUANZE:

1.LIULIANGQ:

作为容积式泵,影响双螺杆泵流量的因素主要有转速n,压力p,以及介质的粘度v。

皇冠即时比分1.1 ZHUANSU n DEYINGXIANG:

LUOGANBENGZAIGONGZUOSHI,LIANGLUOGANJICHENTAOZHIJIANXINGCHENGMIFENGQIANG,LUOGANMEIZHUANDONGYIZHOUBIANYOUJINKOUXIANGCHUKOUYICHUYIGEMIFENGQIANG,JIYIGEMIFENGQIANGDETIJIDEYETIBEIPAICHUQU。LIXIANGZHUANGTAIXIA,BENGNEIBUWUXIELOU,NEIMEBENGDELIULIANGYUZHUANSUCHENGZHENGBI。JI:

Qth=n*q

n—-ZHUANSU;

皇冠即时比分q—-LILUNPAILIANG,JIBENGMEIZHUANYIZHOUSUOPAICHUDEYETITIJI;

Qth—-LILUNPAILIANG。

皇冠即时比分1.2 YALI△PDEYINGXIANG:

皇冠即时比分BENGSHIJIGONGZUOGUOCHENGZHONG,QINEIBUCUNZAIXIELOU,YECHENGHUAYILIANG。YOUYUBENGDEMIFENGQIANGYOUYIDINGDEJIANXI,QIEMIFENGQIANGQIAN、HOUCUNZAIYACHA△P,YINCI,YOUYIBUFENYETIHUILIU,JICUNZAIXIELOU,XIELOULIANGYONG△QBIAOSHI,ZE

Q=Qth-△Q

XIANERYIJIAN,SUIZHEMIFENGQIANGQIAN、HOUYACHA△PSHENGGAO,XIELOULIANG△QZHUJIANZENGDA。DUIYUBUTONGXINGXIANHEJIEGOU,YINGXIANGDAXIAOYEGEBUXIANGTONG。

1.3 ZHANDUvDEYINGXIANG:

SHIXIANG:JIANGQINGSHUIHEZHANCHOUDEJIANGHUYIXIANGTONGDETIJICONGLOUDOUSHIDERONGQIZHONGXIELOUCHUQU。XIANRANSHUIBIJIANGHUYAOXIELOUDEKUAI。

TONGLI,DUIYUSHUANGLUOGANBENG,ZHANDUDADELIUTIBIZHANDUXIAODEYETIDEXIELOUYAOXIAO,XIELOULIANGYUJIEZHIZHANDUYOUYIDINGDEBILIGUANXI。

皇冠即时比分ZONGSHANGSUOSHU,YAOZONGHEDIKAOLVYISHANGGEZHONGYINSU,TONGGUOYIXILIEDEJISUANCAINENGJINGQUEDIZHIDAOBENGDESHIJILIULIANGSHIFOUFUHEGONGKUANGYAOQIU。

 

2.YALI△P:

离心泵皇冠即时比分不同,双螺杆泵的工作压力△P由出口负载决定,即出口阻力来决定。出口阻力与泵的出口处的压力是匹配的,出口阻力越大,工作压力也越大。若想知道压力,则需要用流体力学的知识对出口阻力精确的计算。

3.ZHOUGONGLVN:

BENGDEZHOUGONGLVFENWEILIANGBUFEN,JI:

Nth—-YEYAGONGLV,JIYALIYETIDENENGLIANG;

Nr—-MOCAGONGLV。

DUIYUQUEDINGDEYALIHELIULIANG,QIYEYAGONGLVSHIYIDINGDE,YINCIYINGXIANGZHOUGONGLVDEYINSUWEIMOCALVNr。

MOCAGONGLVSHIYOUYUYUNDONGBUJIANDEMOCAERXIAOHAODENEIBUFENGONGLV。ZHEIXIEMOCAGONGLVXIANRANSHISUIZHEGONGZUOYACHADEZENGJIAERZENGJIADE,BINGQIEJIEZHIZHANDUDEZENGJIAYEHUIYINQIYETIMOCAGONGLVDEZENGJIA。

YOUCI,BENGDEZHOUGONGLVCHULEYEYAGONGLVWAI,QIZHONGMOCAGONGLVSUIJIEZHIZHANDUJIGONGZUOYALIERZENGJIA,YINCIZAIXUANZEPEITAODIANJISHI,JIEZHIDEZHANDUYESHIYIGEFEICHANGZHONGYAODECANKAOSHUJU。YOUQIZAISHUSONGGAOZHANDUJIEZHISHI,XUYAOZUOBIJIAOJINGQUEDEJISUAN。

皇冠即时比分ZAIJISUANGONGLVHOU,XUANZEPEITAODIANJISHIYINGZUNZHAOYANGBENBIAOGEZHONGSUOGUIDINGDEYOUGUANGUIDING。

 

N(KW)
N≤10
10<N≤50
N>50
N>100
K
1.5
1.25
1.15
1.1

Nm=N.K

Nm—-DIANJIGONGLV N—-ZHOUGONGLV K—-GONGLVCHUBEIXISHU

4.XISHANGXINGNENGDEJISUANJIXUANZE

BENGGONGZUOFENWEIYIXIAJIGEJIEDUAN:

4.1 XIRU,CISHIYETILIANXUBUDUANDIYANXIRUGUANDAOYIDONG;

皇冠即时比分4.2 XUANZHUANDELUOGANBANENGLIANGCHUANJIGONGZUOYETI;

皇冠即时比分4.3 YACHU,CISHIYETIDAIYOUKEFUYACHUGUANDAOXITONGSUOYOUZULISUOBIXUDEYALICONGBENGZHONGPAICHU。

ZAIYISHANGSANGEJIEDUANZHONG,ZUIWEIZHONGYAODEJIEDUANSHIBIXUBAOZHENGBENGDEXISHANGTIAOJIAN,BENGCAINENGZHENGCHANGGONGZUO,ZHEISHIBENGGONGZUODEZHONGYAOTIAOJIAN,FOUZEJIUHUIFASHENGQISHI,JIYINQIZHENDONG,ZAOYINDENGWENTI。

5.QISHIYULIANGDEJISUAN:

BENGDEQISHIYULIANGNPSHrYUBENGDEZHUANSUn,DAOCHENGhYIJIBENGSUOSHUSONGJIEZHIDEZHANDUvDENGYINSUDOUYOUGUANXI,DUIWOCHANGYINJINDEBornemannSHUANGLUOGANBENGYONGYIXIAGONGSHIJISUAN:

NPSHr=(1.5+0.253VF 1.84345+0.0572VF 1.55)*v 0.4146

VF—-ZHOUXIANGLIUSU,VF=n*h/60(m/s);

n—-ZHUANSU(r/min);

h—-DAOCHENG(m);

皇冠即时比分v—-GONGZUOZHANDU(°E)。

YOUCIKEJIAN,BENGDENPSHrSHISUIVF,vDEZENGDAERZENGDA。YINCIZAIXIRUTIAOJIANBUHAODEQINGKUANGXIA,YIXUANZEXIAODAOCHENGDESHUANGLUOGANBENG。ZHEIZAIXUANXINGSHISHIHENZHONGYAODE。

5.1 ZHUANGZHIQISHIYULIANGNPSHaDEJISUAN,ZHEILIBUZAICHANSHU。

皇冠即时比分5.2 XIANGYAOBAOCHIBENGZHENGCHANGGONGZUO,JIBUFASHENGQISHI、ZHENDONGDENGWENTI,BIXUBAOZHENGYIXIATIAOJIAN:

NPSHa>NPSHr ZHEIJISHIBENGDEXIRUTIAOJIAN。

6.SHUANGLUOGANBENGDEZHUANSUXUANZE:

XUANZEBUTONGDEZHUANSUCHANGQIANSHEYIXIAWENTI:

6.1 TONGGUOXUANZEHESHIDEBENGZHUANSU,YIDADAOSHIDANGDEXINGNENGCANSHURULIULIANGDENG。

6.2 SUIZHEZHANDUDEBUTONG,BENGDEZHUANSUYIYINGYOUSUOGAIBIAN。

DUIYUBoremannSHUANGLUOGANBENG,ZHANDUDEBIANHUASHIJUEDINGZHUANSUDEZHUYAOTIAOJIAN,SUIZHEZHANDUDEZENGDA,YUNXUZHUANSUYEYUEDI。

ZHUANSUDEXUANZESHIZHIYESHIXISHANGXINGNENGDEWENTI,YOUQISHIZAIGAOZHANDUDEQINGKUANGXIA,RUGUOZHUANSUXUANDEGUOGAO,JIUHUIYINQIXIRUBUZU,CONGERCHANSHENGZAOYINHEZHENDONGDENGWENTI。YINCIWUBIZUNZHAOYOUGUANYUANZEXUANZEZHUANSU。

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