影响渣浆泵性能的因素
一、叶轮出口直径D2
    根据叶片出口速度三角形和式(2-14)泵的基本方程可以得到:当D2减小时，u2、0。12减小，泵的扬程也就减小，所以在实际使用中，常用切割叶轮外径的方法来改变泵的性能。
二、叶片出口角β2
    增大叶片出口角β2时，vu2增大，泵的扬程也会增大。
三、泵转速n
    当改变转速n时;同样也会改变u、v.。当n降低时，u、v减小，泵的扬程也就减小。在实际使用中，常用改变泵的转速来改变泵的性能。
四、叶片出口宽度b2
    增加叶片出口宽度b2时，从式(2-13)可以看出泵的流量会增大。

五、叶片出口圆周长度δ2

减小叶片出口圆周的长度δ2时，从式(2-13)看出减小了出口排挤即增大了心，也会使泵的流量增大。在实际使用中，我们常在叶片背面锉去一些叶片出口圆周长度，δ2减小，称叶轮齐口，如图2- 48所示，也能增加泵的一些流量。流量不变时，能少量提高泵的扬程。六、叶轮进口直径D,
    增大叶轮进口直径D1会降低叶轮进口的流速，从而提高泵的汽蚀性能，但过大地增加叶轮进口直径，会使泵的效率降低。
七、叶片进口宽度b,
    在轴面投影图上，叶片进口边上前后盖板的内切圆的直径就是叶片进口宽b1，增大叶片进口宽度bq,降低了进口流速，就可以提高泵的汽蚀性能。在要求高汽蚀性能的泵的叶轮，常采用此方法，例多级泵的第一级叶轮， 冷凝泵的叶轮等。增加b，必然会增加Do，所以会降低泵的效率。渣浆泵

Factors affecting the performance of slurry pump

I. impeller outlet diameter D2

According to the basic equation of delta sum (2-14) pump of blade outlet velocity, when D2 decreases, U2 and 0 can be obtained. 12 reduce, the head of the pump is also reduced, so in practical use, the method of cutting the outer diameter of the impeller is often used to change the performance of the pump.

II. Blade outlet angle β 2

When the blade outlet angle β 2 is increased, vu2 is increased and the pump head is also increased.

III. pump speed n

When the rotating speed n is changed, u and V will also be changed. When n decreases, u and V decrease, and the head of the pump also decreases. In practice, it is often used to change the speed of the pump to change the performance of the pump.

IV. blade outlet width B2

When increasing the blade outlet width B2, it can be seen from equation (2-13) that the pump flow will increase.

V. circumference length of blade outlet δ 2

When the length δ 2 of the blade outlet circumference is reduced, it can be seen from equation (2-13) that reducing the outlet extrusion increases the center and the pump flow. In actual use, we often file off the circumference length of some blade outlet on the back of the blade, δ 2 is reduced, which is called impeller flush, as shown in figure 2-48, which can also increase some flow of the pump. When the flow rate is constant, the head of the pump can be slightly increased. Vi. impeller inlet diameter D,

Increasing the impeller inlet diameter D1 will reduce the flow velocity at the impeller inlet and improve the cavitation performance of the pump, but increasing the impeller inlet diameter excessively will reduce the efficiency of the pump.

7. Blade inlet width b,

On the axial projection diagram, the diameter of the inner tangent circle of the front and rear cover plate on the inlet side of the blade is the width of the blade inlet B1. Increasing the width of the blade inlet BQ and reducing the inlet flow rate can improve the cavitation performance of the pump. This method is often used in impellers of pumps with high cavitation performance, such as the first stage impellers of multistage pumps and the impellers of condensate pumps. Increasing B will inevitably increase do, so it will reduce the efficiency of the pump. Slurry pump