Centrifugal pump, axial flow pump, mixed-flow pump and deep well pump water absorption function

Centrifugal pump and axial flow pump water absorption function is based on the vacuum formed by the suction port, so that water under atmospheric pressure, was inhaled impeller center. In theory, it can draw no less than 10m of water in the pump center. In fact, the pumping height of a typical water pump is only 5-7m. Mostly for deep-well pump axial pump, suction stroke even lower. Only its pump body and impeller are immersed in water downhole. Pump on the well tube leading to the ground. After the water is gradually boosted by the impeller of the pump, it is discharged to the ground by the well tube. It is able to send deep groundwater not because of its strong suction ability, but when the water is pressurized underneath and under pressure Send it up The deeper the groundwater level, the higher the pressure head required to send water up and the deeper the pump will be.

Francis pump from the shape and structure are between the centrifugal pump and the axial flow pump; Francis pump pumping principle, the impeller high-speed rotation, both centrifugal force centrifugal pump, but also with axial pump push force, mixed-flow pump rely on this A mixture of two forces pumping water. Mixed-flow pump performance is also between the centrifugal pump and axial pump, centrifugal pump and it compared to the lower head, while the larger flow; it compared with the axial flow pump, head higher, but the flow is smaller. This is a vast area for our country, terrain complex, more than a pump type selected according to local conditions.

The performance of mixed-flow pumps is expressed in terms of operating parameters. Such as flow, lift, power, efficiency, speed and so on. In a certain speed, the flow as a variable, that is, if you change the flow of the pump, the pump head, power and efficiency are all changes. The relationship between these changes in the law, drawn together into several curves to represent, this is the pump performance curve. Mixed-flow pump performance curve shape is also between the centrifugal pump and axial pump, for high-lift mixed-flow pump, the flow and lift, flow and power changes in the law close to the centrifugal pump, in use, the valve can be closed Start, when the power is the smallest, power machine safety. For the low-head mixed-flow pump, the variation law between the performance parameters is close to the axial flow pump. In use, the valve should not be used to start the valve, but should start the valve when the power is relatively small, the motor is not easily burned.

In view of the above characteristics, mixed flow pump for irrigation and drainage in the hilly areas.

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