1. Working principle of centrifugal pump. 

Before the pump is started, the pump and the intake pipe are filled with water. After the pump runs, under the action of the centrifugal force generated by the high-speed rotation of the impeller, the water in the impeller passage is thrown around and pressed into the volute, and a vacuum is formed at the entrance of the impeller. 

The water in the pool is inhaled along the suction pipe under external atmospheric pressure to supplement this space. 

Then the inhaled water is thrown out of the impeller and into the outlet pipe through the volute. 

Thus it can be seen that if the centrifugal pump impeller is constantly rotating, it can continuously absorb and pressure water, and the water can be continuously raised from the low to the high or far away. 

To sum up, the centrifugal pump is called centrifugal pump because of the centrifugal force produced by the high-speed rotation of the impeller. 

2. General characteristics of centrifugal pump. 

The main results are as follows: (1) the flow direction of water along the centrifugal pump is inhaled along the axial direction of the impeller, perpendicular to the axial flow, that is, 90 °in and out of the flow direction. 

(2) due to the vacuum suction of the centrifugal pump by the impeller inlet, water must be poured into the pump and the suction pipe before starting, or the vacuum pump must be used to drain air to form a vacuum, and the pump shell and suction line must be strictly sealed, 

Do not leak, otherwise the shape can not form a vacuum, it will not be able to absorb water. 

(3) since it is impossible to form an absolute vacuum at the inlet of the impeller, the suction height of the centrifugal pump should not exceed 10 m, coupled with the loss of water flowing through the suction line, 

The actual allowable installation height (the height of the pump axis from the suction surface) is much less than 10 meters. 

If the installation is too high, it will not absorb water; in addition, because the atmospheric pressure in the mountain area is lower than that in the plain, the installation height of the same water pump in the mountain area, especially in the high mountain area, should be reduced, otherwise the water can not be absorbed. 

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