螺杆泵的性能参数换算
来源： 发布时间：2011/7/1 10:19:36
| 螺杆泵性能参数换算 | the count of characteristic data of pump selected |
| 以下各章均列出产品性能表，当用户根据需要在性能表中无法查得轴功率及流量时，可按如下方法近似确定： | when you can"t get the capacity power and capacity from the characteristic table you need count it： |
| (一)轴功率的换算 | (一) the cowt of power |
| 1. 当压力由p变成p1而粘度、转速不变时，轴功率n：
n = (qp1/3.67η0)[1 (η0/η-1)p/p1] (kw) 式中: q、p均为性能表中列出的接近用户需用要的那一组流量(m3/h)及压力值（mpa）； η、η0为在性能表标定的流量、压力时对应的总效率及容积效率。它们可在相应的η-p曲线图中查得。曲线均有离散性，按照"随规格的增大而取大值" 的原则进行取值。 |
1.when the pressure is from p to p1,but viscosity and speed do not change,you count the power n: n =(qp1/3.67η0)[1 (η0/η-1)p/p1] (kw) note: the q, p is the data that you can get from characteristic table q(m3/h) and p(mpa). η,η0is the corresponding total efficiency and volume efficiency when the capacity and pressure is signed by q, p. you can get them from η-p drawing. |
| 2. 当粘度从 e 变成 e1而压力、转速不变时，
n = (qp/3.67η0)[1 (η0/η-1)√e1/e] (kw) |
2. when the viscosity is from e to e1, but the pressure and speed don"t change, you can count the power: n = (qp/3.67η0)[1 (η0/η-1)√e1/e] (kw) |
| 3. 转速从 n 变成 n1时，压力、粘度不变时，轴功率 n：
n = (qpn/3.67η0n1)[1 (η0/η-1)√n1/n] (kw) |
3. when the speed is from n to n1, but the pressure and viscosity don"t change, you can count the power n: n = (qpn/3.67η0n1)[1 (η0/η-1)√n1/n] (kw) |
| (二) 流量的换算 |
(二) the count of capacity |
| 1. 对于粘度大于50e 的介质，当粘度从e变成 e1时，流量 q 变为 q1： q1= q/η0[1-(1-η0)1/k] (m3/h) k=(√e1 1.5)/(√e 1.5) 注：η0为标定流量q时的容积效率； e、e1单位恩氏粘度0e 。 |
1. when the viscosity is from e1 and they are more than 50e, the capacity will be form q to q1: q1= q/η0[1-(1-η0)1/k] (m3/h) k=(√e1 1.5)/(√e 1.5) |
| 2. 当转速从n变成n1而粘度、压力不变时，流量q1近似为： q1= q/η0[n1/n-(1-η0)] (m3/h) |
2.when the speed is from n to n1, but the viscosity and pressure don"t change, the capacity q1can count approximately: q1= q/η0[n1/n-(1-η0)] (m3/h) |
