Vertical Axial Flow Pump-HNYB PUMP

Axial flow pumps are a type of equipment commonly used to transport large amounts of liquid. The structure and working principle of axial flow pumps are somewhat unique. Axial flow pumps transport liquids in an axial flow manner through the rotation of the impeller. They have the characteristics of large flow, simple structure, and light weight. They are widely used in agricultural irrigation, urban drainage and other fields.

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• Working Principle

Axial flow pumps convey liquids not by relying on the centrifugal force of the impeller on the liquid, but by using the thrust of the rotating impeller blades to make the conveyed liquid flow along the pump shaft direction. When the pump shaft is driven by the motor to rotate, due to the certain helical angle between the blades and the axis of the pump shaft, thrust (or lift) is generated on the liquid, pushing the liquid out and discharging it along the discharge pipe. This is similar to the operation of an electric fan, where the air near the front of the fan blades is pushed forward by the blades to make the air flow. When the liquid is pushed out, a local vacuum is formed at the original position, and the liquid outside will be sucked into the impeller along the inlet pipe under the action of atmospheric pressure. As long as the impeller keeps rotating, the pump can continuously inhale and discharge liquid.

• Characteristics of axial flow pump

It has large flow, simple structure, light weight, small size, and its shape is tubular, so it occupies a small area.
When the vertical axial flow pump is working, the impeller is completely immersed in water, and the pump does not need to be primed when starting, which is simple and convenient to operate.
For the adjustable axial flow pump, when the working conditions change, as long as the blade angle is changed, it can still work at a higher efficiency.

• The main disadvantages of axial flow pumps

The head is too low, so the application range is limited.
Since axial flow pumps are low-head, large-flow pumps, they are usually used for large-scale agricultural irrigation and drainage, urban drainage, conveying circulating water for thermal power plants that require a large amount of cooling water, and raising and lowering water levels at docks.
The self-priming capacity is limited.
The efficiency curve is steep and the high-efficiency zone is relatively narrow. If there is no device to adjust the impeller blade placement angle, the economy is poor when it deviates from the design operating conditions.

• Selection of axial flow pump

Determine the pressure: The rated pressure of the selected axial flow pump should be slightly higher than the actual maximum pressure required, generally 10-20% higher. Do not choose too high a pressure, as too high a pressure will waste energy and increase equipment investment and operating costs.

Determine the flow rate: The selected axial flow pump flow rate should be equal to or slightly greater than the flow rate required by the process. The use range of the pump flow rate is preferably 30-100% of the rated flow range of the pump, at which time the pump has high reproducibility accuracy. Considering the economy and practicality, it is recommended that the actual required flow rate of the pump be selected as 70-90% of the rated flow rate of the metering pump.

Determine the material of the pump head (hydraulic end): After the specific model and specifications of the pump are determined, the material of the flow part is selected according to the properties of the flow medium. This step is very important. If the selection is inappropriate, it will cause the medium to corrode and damage the flow parts or the medium to leak and pollute the system. In severe cases, it may also cause major accidents.