The influence of the screw pump rotating speed of screw pump

screw pump rotation speed, the influence of screw pump rotation speed of pump, the influence of the rotational speed of screw pump

although screw pump in theory as well as other types of pumps running quickly ( 1800 r / min) , but rarely screw pump speed at this speed. * is & other; Nutation & throughout; Geometry size lead to the unbalance of the rotor ( For example, the centrifugal force generated in the rotor weight deviation from the centerline of the pump) 。

the influence of the rotational speed of screw pump:

according to Newton's law: F centrifugal ( Unbalanced) ≈ m× υ 2 turn & times; E

this means that the screw pump speed faster, the greater the unbalanced force, the greater the vibration.

limit the second factor is the rotational speed of screw pump viscosity. If fluid easily into the population of pump, pump internal components ( Rotor) Will assume the task of conveying fluid, flow experience came out from the other end. Any positive displacement pump (under a given speed, Including screw pump) Traffic is a constant, and in fact is not depends on the viscosity. However, it is worth noting that at a very low viscosity ( Less than 30 ~ l00cP) , slippage will affect the net flows. Power demand has what kind of change? Makes the increase in power to drive the rotor displacement a viscous liquid. When the structure or driving power rating, would normally travel continuously. The ability of its pumping fluid volume is greater than the population pressure driving amount of liquid to pump room oral ability. Into the mouth room cannot be completely full of, can cause cavitation, vibration, noise, and can reduce the throughput. According to the hydraulic institute minimum suction pressure is defined as a front-end pressure pump suction population, under the pressure loss of positive displacement pump more than 55% of its traffic. The inlet pressure is lower than the minimum pull pressure pump can not run; Have the safety factor of a man is higher than the minimum suction pressure = pump through the practical significance of the suction system design is between the water storage tank and pump with short, coarse connecting pipe, to reduce the number of elbow, turning and turning parts, reducing inlet flow loss as much as possible.

limit speed of the third factor is the solid content. For example, screw pump water ( No viscosity material) As a carrier fluid handling of the slurry, if the coal particles within the pump pipeline moving too fast, will damage the rubber bushing. Therefore, reduce the pump speed can significantly increase the service life of the pump liner.

one or all of these factors are often appeared in the process of screw water pump operation: imbalance ( Always appear) , high viscosity and particle size. Screw pump rotation speed, therefore, generally not more than 300 ~ 500 r/min, sometimes even lower. For very viscous fluid, screw pump speed in 10 ~ 50 r/min.

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