The principle of a water pump that uses atmospheric pressure is to use atmospheric pressure to press water into the inlet of the water pump.
The working principle of the centrifugal pump is that the water at the water pump inlet passes through the atmospheric pressure to the water pump inlet, and then passes through the rotation of the water pump impeller, so that the water has a high pressure head and is forced out of the water pump outlet.
Therefore, a certain cavitation margin must be left at the inlet of the water pump to prevent the water pump from vaporizing. The siphonage principle (Syphonage) is a fluid mechanics phenomenon that can suck liquid without the help of a pump.
The siphon principle uses the force of the liquid level difference to fill an inverted U-shaped tubular structure (called a siphon) with liquid, and then place the high end of the opening into a container filled with liquid. , the liquid in the container will continue to flow out to a lower position through the siphon. The essence of siphon is caused by liquid pressure and atmospheric pressure.