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The working principle and characteristics of 4 inch water pump

Date: 2020/08/12

The working principle of 4 inch water pump:

Before starting the pump, fill the pump and the inlet pipe 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 channel is thrown into four phases.

Around the volute, the inlet of the impeller forms a vacuum. The water in the pool is sucked along the suction pipe under the external atmospheric pressure to supplement this space. The sucked water is thrown out by the impeller through the volute and enters the outlet pipe. It can be seen that if the impeller of the centrifugal pump rotates continuously, it can continuously absorb and press water, and the water can continuously rise from low to high or far.

The working principle and characteristics of 4 inch water pump

The general characteristics of 4 inch water pump:

(1) The flow direction of water along the 4 inch water pump is sucked in along the axial direction of the impeller, and flows out perpendicular to the axial direction, that is, the direction of water flow in and out is 90° with each other.

(2) Since the water pump forms a vacuum suction by the impeller inlet, it is necessary to fill the pump and suction pipe with water before starting, or use a vacuum pump to exhaust the air to form a vacuum, and the pump casing and suction pipe must be strictly sealed. Air leaks, otherwise a vacuum will not be formed and water will not be sucked up.

The working principle and characteristics of 4 inch water pump

(3) Since it is impossible to form an absolute vacuum at the impeller inlet, the suction height of the pump cannot exceed 10 meters. In addition to the loss along the way caused by the water flowing through the suction pipeline, the actual allowable installation height (the height of the pump axis from the suction surface) is much less than 10 If the meter is installed too high, it will not absorb water; in addition, because the atmospheric pressure is lower in mountainous areas than in plains, the installation height of the same pump in mountainous areas, especially in high mountainous areas, should be lowered, otherwise it cannot suck up water.