Vertical axial flow pump structural features

Axial flow pump impeller is equipped with 2 to 7 leaves, and rotate in the tube shell. In the upper part of the pump housing is provided with a fixed guide vane, to eliminate the rotational movement of the liquid, it can be changed to axial movement, and the rotational kinetic energy into pressure energy. Axial flow pumps are generally single-stage, a few for the two-stage. Flow range is very large, 180,36 cubic meters / hour, the first is generally 20 meters below. Axial flow pump is generally vertical, the impeller submerged in water, a horizontal or diagonal axial flow pump. When a small axial pump impeller mounted on the water, you need to start with a vacuum pump. Axial flow pump blade 2 kinds of structure, the blade is fixed, adjustable. Large axial flow pump working conditions (mainly refers to the flow) in the operation often need to make major changes, adjust the blade installation angle can be maintained in different working conditions of high efficiency zone. Small pump blade mounting angle is generally fixed. Axial flow pumps are pumps of high specific speed, from 500 to 1600. Pump flow The head, flow-shaft power characteristics are steep in the low flow area and should be avoided in such unstable low flow areas. When the axial flow pump at zero flow, the maximum shaft power, so the pump must first open the valve on the exhaust pipe, began to reduce the starting power. Axial flow pump is mainly used for low lift and large flow situations, such as regulating the water level in the irrigation, drainage, dock drainage, drainage lock, or as a large power station circulating pump. Axial flow pumps (which are necessary, two stages) can be used for shallow water propulsion.

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