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影響渣漿泵性能的因素
一、葉輪出口直徑D2
根據(jù)葉片出口速度三角形和式(2-14)泵的基本方程可以得到:當(dāng)D2減小時(shí)，u2、0。12減小，泵的揚(yáng)程也就減小，所以在實(shí)際使用中，常用切割葉輪外徑的方法來(lái)改變泵的性能。
二、葉片出口角β2
增大葉片出口角β2時(shí)，vu2增大，泵的揚(yáng)程也會(huì)增大。
三、泵轉(zhuǎn)速n
當(dāng)改變轉(zhuǎn)速n時(shí);同樣也會(huì)改變u、v.。當(dāng)n降低時(shí)，u、v減小，泵的揚(yáng)程也就減小。在實(shí)際使用中，常用改變泵的轉(zhuǎn)速來(lái)改變泵的性能。
四、葉片出口寬度b2
增加葉片出口寬度b2時(shí)，從式(2-13)可以看出泵的流量會(huì)增大。
五、葉片出口圓周長(zhǎng)度δ2
減小葉片出口圓周的長(zhǎng)度δ2時(shí)，從式(2-13)看出減小了出口排擠即增大了心，也會(huì)使泵的流量增大。在實(shí)際使用中，我們常在葉片背面銼去一些葉片出口圓周長(zhǎng)度，δ2減小，稱葉輪齊口，如圖2- 48所示，也能增加泵的一些流量。流量不變時(shí)，能少量提高泵的揚(yáng)程。六、葉輪進(jìn)口直徑D,
增大葉輪進(jìn)口直徑D1會(huì)降低葉輪進(jìn)口的流速，從而提高泵的汽蝕性能，但過(guò)大地增加葉輪進(jìn)口直徑，會(huì)使泵的效率降低。
七、葉片進(jìn)口寬度b,
在軸面投影圖上，葉片進(jìn)口邊上前后蓋板的內(nèi)切圓的直徑就是葉片進(jìn)口寬b1，增大葉片進(jìn)口寬度bq,降低了進(jìn)口流速，就可以提高泵的汽蝕性能。在要求高汽蝕性能的泵的葉輪，常采用此方法，例多級(jí)泵的第一級(jí)葉輪， 冷凝泵的葉輪等。增加b，必然會(huì)增加Do，所以會(huì)降低泵的效率。渣漿泵
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
