安徽快3开奖结果

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安徽快3开奖结果 News
渣浆泵的功率和效率
添加时间:2020.01.27

渣浆泵的功率和效率

1. 机械效率

离心泵的机械效率是指水力功率Ph功率P之比,用来衡量机械损失功率Pm,7来表示:
2.容积效率
    离心泵的容积效率是指实际流量Q与理论流量Qt之比,用来流量损失的大

小,用η来表示:

ηv=Q/QT=1-q/Qt
3.水力功率和水力效率
    离心泵的水力功率是指单位时间内叶轮给出的能量,Ph来表示:
                         Ph= pgQrHr
式中Ht----理论扬程 ,m;
     Qt----理论流量,指不考虑流量损失时的流量,m2/s

离心泵的水力效率是指有效扬程H与理论扬程Ht之比,用来衡量流动损失的大小,用ηh来表示:
                            ηh=H/HT
4.轴功率和总效率
    轴功率与以上各种功率之间的关系为: 渣浆泵厂家
    (1-43)说明,的总效率η于容积效率ηv,水力效ηh机械效率ηm三者的乘积。要提高泵的效率,就必须从设计和运行等方面考少各种损失。一般离心泵各种效率的参考值列于表1-3中。

Power and efficiency of slurry pump

1。 Mechanical efficiency

The mechanical efficiency of centrifugal pump refers to the ratio of hydraulic power pH to shaft power P, which is used to measure the magnitude of mechanical loss power △ PM, expressed by 7:

2. Volumetric efficiency

The volume efficiency of centrifugal pump refers to the ratio of actual flow Q to theoretical flow QT, which is used to measure the large flow loss of centrifugal pump

Small, denoted by η:

ηv=Q/QT=1-q/Qt

安徽快3开奖结果3. Hydraulic power and efficiency

The hydraulic power of centrifugal pump refers to the energy given by impeller in unit time, which is expressed in pH:

Ph= pgQrHr

安徽快3开奖结果Where HT - Theoretical lift, m;

QT - theoretical flow, refers to the flow without considering the flow loss, m2 / s.

The hydraulic efficiency of centrifugal pump refers to the ratio of effective head h to theoretical head HT, which is used to measure the flow loss, expressed by η H:

ETA h=H/HT

安徽快3开奖结果4. Shaft power and total efficiency

The relationship between shaft power and above power is: slurry pump manufacturer

安徽快3开奖结果Formula (1-43) shows that the total efficiency η of the pump is equal to the product of volumetric efficiency η V, hydraulic efficiency η h and mechanical efficiency η M. In order to improve the efficiency of the pump, we must consider and reduce all kinds of losses from the aspects of design, manufacture and operation. The reference values of various efficiency of general centrifugal pump are listed in table 1-3.






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