The difference between axial flow pump and centrifugal pump

the appearance of axial flow pump structure and working principle are unlike centrifugal pump, its performance also has great difference. In the actual work, must strictly distinguish, adopt different ways to use to guide the production practice, solve production problems. Of course, use scope is different, the difference is as follows:

1. Fluid flow, Water) After the impeller flow in a different direction:

a. The effect of centrifugal water pump: in centrifugal force low radial flow.

      b. Axial flow pump to keep the axial flow ( Parallel to the impeller rotating center) 。

2, ratio of revolution:

centrifugal pump than the revolution in 300, under the axial flow pump turn than number greater than 500.

3, different working principle:

a. Centrifugal pump is generally driven by motor, before start the water pump, pump body and filled with liquid in the suction pipe. When high-speed rotating impeller, the impeller to drive the liquid between a blade rotation, due to the effect of centrifugal force, the liquid from the impeller center is flung to the impeller outer edge ( Flow rate can be increased to 15 ~ 25 m/s) The kinetic energy also increases. After the fluid entering the pump shell, as the flow in the volute type pump shell gradually expand, liquid velocity decreases gradually, part of the kinetic energy into static pressure can, so the liquid with high pressure along the flow discharge. At the same time, the impeller center liquid was thrown to form a certain vacuum, pressure and liquid level of Pa to be higher than the impeller center, as a result, liquid suction pipe under the action of pressure difference into the pump. The impeller rotates, the liquid is continuously by the suction and pressure. Due to the centrifugal pump are able to transport the liquid, mainly by the effect of centrifugal force, the so called centrifugal pump.

      b. Axial flow pump with the impeller rotating in the aquatic produce thrust ( Lift) Work, is a large capacity low head pump.

the working principle of axial flow pump axial flow pump and centrifugal pump working principle is different, it basically is to use the thrust generated by high speed rotation of the impeller carry water. Axial flow pump blade rotates on water lift, push the water from the bottom to the top. Axial flow pump blades usually submerged in the pool of water absorption. Because of the high speed rotating impeller, the effects of the lift on the blade, continuously pushes the water upward pressure, the water flows along the outlet pipe. The rotation of the impeller constantly, water is continuous pressure to high.

the work of the axial flow pump is based on aerodynamic theory of lift. When high-speed rotating impeller, pump body is the liquid particles from the role of the impeller shaft to lift, make water flow along the axial direction.

4, pump performance curve is different:

a. Centrifugal water pump, the flow of small head high, when it's used must not exceed the rated flow of pump, can use the outlet flow adjusting valve, water pump overload will not occur. To adopt closed valve starts, when power is small, the motor is not easy to burn.

      b. Axial flow pump, low capacity big head, can't use export flow adjusting valve, on the use of no more than the rated range, unfavorable use valve starts, axial flow pump is started to open the outlet valve, when the power is small, the motor is not easy to be burned.

5, the structure of the pump are also different:

with an average of volute centrifugal pump. Axial flow pump looks very much like a water pipe, water inlet diameter and the diameter of the pump shell.

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