工业软管泵选型指导
Volume Air Dome (CI) = 4.2085 X V1 x Pd
V1 [ l/bar]
VF/10
VF/15 VF/25 VF/32 VF/40 VF/50 VF/65 VF/80 VF/100 VF125
0.05
0.2 0.8 1.4 2.5 5 9.3 16 33 66
Air Dome Volume in CI V1 volume [ l/bar]
26.6m3/h /117GPM 40 m3/h / 175 GPM 33 m3/h / 146 GPM 55 m3/h / 242 GPM 55 m3/h / 242 GPM 90 m3/h / 395 GPM
蠕动泵选型计算表(选型软件)
计算内容 推动力和摩擦损失 脉动缓冲 Reynolds Number 进口压力 &是否需要真空 出口压力 轴功率Absorbed Power 起动扭矩Starting Torque 流量:升/小时, m3h-1 or 美国加 仑/分 压力 - kPa, Bar or PSI
20 17.5
Available Lift in Mtres
15 12.5 10 7.5 5 2.5 0 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Specific Gravity 60 kPa 80 kPa 100 kPa 2
最大提升高度一览
密度越大,静态扬程就越高,泵的最大自吸高度就越低(以 上数据未考虑系统损失)
液体密度对自吸提升的影响
S ta tic He a d v e rs u s S p e c ific G ra v ity
30
25
Hale Waihona Puke S ta tic H e a d in P S I
20
15
10
5
0 0 .6 0 .7 0 .8 0 .9 1 1 .1 1 .2 1 .3 1 .4 1 .5 1 .6 1 .7 1 .8 1 .9 2
4m 0.9 VF50
Product Viscosity3000 CPS Flow 3500 l/hour Speed 21.8 rpm
The Effect of Undersizing the Discharge Line on Impulse Loss
Im p u ls e L o s s v e r s u s L in e D ia m e te r
Reducing Pulsation
Pulsation can be reduced by :
Changing the bore of line (increasing the diameter) – usually best for suction line problems Fitting a freely moving flexible hose – hose should not be steel re-enforced and removes approximately 1 bar of pulsation per metre Fitting a Pulsation Damper - normal for long discharge lines where the line ID is less than the pump size typically when pumping slurries
VF25
VF32 VF40 VF50 VF65 VF80 VF100
0.28
0.60 1.25 2.67 5.67 11.1 18.3
0.0749
0.1585 0.33 0.705 1.5 2.93 4.835
VF125
33.3
8.8
最大流量
泵型 VF10 VF15 VF25 持续运转 间歇运转 100 l/h / 0.45 GPM 160 l/h / 0.72 GPM 375 l/h / 1.65 GPM 600 l/h / 2.64 GPM 1700 l/h / 8 GPM 2210 l/h / 9.6 GPM
c) 操作环境对泵的自吸能力有很大 限制 当然同样流量下我们可选择的泵型有 好几个因此我们还要考虑用户的某些 因素:初期投入和长期运行成本之间 的关系
一次蠕动所产生的流量
泵型 VF10 VF15 每一次挤压蠕动产 生的流量(升) 0.025 0.083 每个流量 (美国加仑) 0.0066 0.022
S p e c ific G r a v ity 10 P S I 12 P S I 14 P S I
推动损失和脉动
推动损失是由实际管长度、流量、转速、液体比重和 管内径相关 La * F * n * s.g.* 0.16 Pi = ----------------------------D2 Pi = 推动损失Impulse loss [kPa] La = 实际管长Actual line length [m] F = 流量Flow [l/hr] n = 转速Pump speed [rpm] s.g.= 比重Specific gravity D = 管内径Diameter of suction or discharge line [mm]
蠕动泵选型指导
- 提出问题,提问的含义以及 最新Verderflex 蠕动泵选型参照表
pres 1
关键问题的提出
我在泵送什么液体? 根据化学性能对照选择合适的软管和管口内塞 我如何操作这台泵? 间断式运行还是持续运行?
帮助我们了解软管的寿命或有机会选择较小的 泵型
液体的温度是多少?
了解软管的温度限制,软管寿命和泵的尺寸
Pd Discharge pressure [PSI]
Air Domes are often a low cost alternative to full spec Pulsation Dampers and suitably sized, can give good damping at moderate levels of pulsation
Volume Air Dome = V1 x Pd
V1 [ l/bar]
0.05
0.2 0.8 1.4 2.5 5 9.3 16 33 66
V1 volume
[ l/bar]
Pd Discharge pressure [bar]
Imperial Air Dome Sizing Guidelines
VF32 VF40
VF50 VF65 VF80 VF100 VF125
3150 l/h/ 14.8GPM 4200 l/h/ 19.8GPM 5625 l/h /26.3GPM 7500 l/h / 35 GPM
9.6 m3/h / 42 GPM 17 m3/h / 76 GPM 12.8 m3/h / 56GPM 25.5m3/h /112GPM
选择3个泵型,以及每个泵型的最 大转速比例和相关的软管寿命
蠕动泵选型计算
- 干嘛不让电脑做工作?
pres 8
静态扬程
静态扬程是液体表面到泵轴的高度 正向扬程就是“+” 自吸提升就是 “-”
Ps = H * s.g. * 9.81
Ps = 静态扬程[kPa] H = 高度 [m] s.g.= 液体密度 [-]
脉动是如何产生的 ?
泵推动液体向上直到出口。 但是 当突块脱离软管在出口点 由于软管弹性复原为圆形 而产生一个真空
这样液体会回流到泵里面
火车可以帮助我们想象 !
减小脉动
减轻脉动的方法有 :
改变管路内径(加大直径) – 通常可以解决吸 入口的问题
增加一段可移动的弹性软管 – hose should not be steel re-enforced and removes approximately 1 bar of pulsation per metre Fitting a Pulsation Damper - normal for long discharge lines where the line ID is less than the pump size typically when pumping slurries
A v a ila b le L ift A g a in s t S p e c ific G ra v ity
60 55 50
A v aila b le L ift in F e e t
45 40 35 30 25 20 15 10 5 0 0 .6 0 .7 0 .8 0 .9 1 1 .1 1 .2 1 .3 1 .4 1 .5 1 .6 1 .7 1 .8 1 .9 2
The net impulse loss is the calculated impulse loss multiplied the damper efficiency
Net Impulse Loss = 90% x Calculated Impulse Loss
Suction Side Impulse Loss – Impact of Line ID
L in e D ia m e te r in m m
Friction Loss
Friction loss for laminar flow Reynolds less then 5000 13* Le * F * C Pf = ------------------D4 Pf = Friction loss [kPa] Le = Equivalent line length [m] F = Flow [l/hr] C = Effective viscosity [mPa.s or cPs] D = Diameter of suction or discharge line [mm] again, increasing the line ID is factor that can be changed to reduce losses