What is the difference between centrifugal pumps and axial flow pumps?

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1. Different starting methods: When starting a centrifugal pump, the outlet valve must be closed, as this results in the lowest power consumption; if the valve is open, it can easily cause damage to the motor. The outlet valve must be opened when starting an axial flow pump, as the power consumption is lowest at this time; if the valve is closed, it can easily cause the motor to burn out. 2. Different fluid flow directions: In a centrifugal pump, the fluid flows from the center to the periphery, that is, in the direction of the centrifugal force ； The flow direction of an axial flow pump is along the axis. 3. Different application ranges: Centrifugal pumps are suitable for applications requiring a high head and low flow rate, such as water supply, drainage, and air conditioning circulation ； Axial flow pumps are suitable for applications requiring high flow rates and low head, such as irrigation, drainage, and cooling. 4. Different efficiencies: The efficiency of centrifugal pumps decreases as flow rate and head increase; the highest efficiency point is relatively narrow, generally ranging between 70% and 90% ； The efficiency of axial flow pumps is higher at high flow rates and low head, typically ranging from 80% to 90%. 5. Different external structures: The inlet and outlet diameters of centrifugal pumps are usually the same, giving them a circular shape ； Axial flow pumps have different inlet and outlet diameters, giving them a tubular shape. 6. Different impeller shapes: The impeller of a centrifugal pump is curved, taking on an arc shape ； The impeller of an axial flow pump is straight and spiral-shaped. In general, centrifugal pumps are suitable for applications requiring high head and low flow rates, while axial flow pumps are suitable for applications with high flow rates and low head.