The relationship between the number of revolutions and flow rate of a screw pump
The relationship between the number of revolutions and flow of a screw pump can be summarized as follows:
1. Positive correlation
In general, there is a positive correlation between the number of revolutions and flow of a screw pump. That is to say, when the number of revolutions of a screw pump increases, its flow rate will also increase accordingly. This is because the working principle of a screw pump is to push the fluid for transportation through the rotation of the screw. The increase in the number of revolutions means that the number of revolutions of the screw increases per unit time, thereby pushing more fluid and increasing the flow rate.
2. Flow calculation formula
For a twin-screw pump, its flow rate Q can be calculated by the following formula: Q=3Ω/16(D2-d2)tn, where Ω/4(D2-d2) is the annular area between the inner and outer diameters of the screw, t is the pitch, and n is the number of revolutions. This formula further confirms the positive correlation between the number of revolutions and the flow rate. When the number of revolutions n increases, the flow rate Q will also increase accordingly.
3. Practical application considerations
Although there is a positive correlation between the number of revolutions and the flow rate, other factors need to be considered in practical applications. For example, when the number of revolutions increases to a certain extent, the flow rate increment may begin to decrease due to the inertia of the internal liquid and the volume effect of the pump. In addition, too high a number of revolutions may also cause problems such as equipment overload, noise and vibration. Therefore, when selecting the number of revolutions of a screw pump, factors such as flow demand, equipment performance, and operational stability need to be considered comprehensively.
4. Summary
In summary, there is a positive correlation between the number of revolutions and flow of a screw pump. In practical applications, it is necessary to select a suitable range of revolutions according to specific needs and equipment characteristics to ensure stable operation and efficient pumping of the equipment. At the same time, it is also necessary to pay attention to controlling the number of revolutions to avoid problems such as equipment overload and noise.
