Self priming centrifugal pump for the first time before starting to use, only need to pump the pump casing into the 2/3 of water, and then start the pump automatically after the water can be sucked up.
Self priming centrifugal pump is very easy to start, it is very convenient to use, and the application of irrigation and irrigation works in the field of irrigation in China is more.
The reason and the principle of self - priming pump are as follows:
Is mainly due to structural parts of the pump body of the self-priming pump and the ordinary centrifugal pump, the main difference is the water pump outlet above the pump shaft; at the water outlet of the pump before the gas water separation room larger and generally have a double pump shell.
So, before starting, self suction pump in the pump shell there is always a part of the water, when the impeller pump rotates, the role of water under the centrifugal force was thrown to the outer edge of the impeller, the impeller inlet to form a vacuum, the inlet air from the pump inlet by suction impeller, formation of gas and water a mixture of leaves in the rim of the rising edge of the volute, when the gas water mixture flow into the gas water separation chamber, because section increases, gas water mixture flow velocity decreases, the air separation chamber by export spillover water, under the action of gravity along the volute lower return, and enter the pump shell and the pump air flow again mixed, so repeatedly, the water pipe in the air has been ruled out, the air inlet pipe net after negative pressure condition, the water will be slowly sucked into the pump body inside, to the pump body after the self-priming pump output swing The role of the speed of water to speed up the flow of water in the inlet pipe to speed up, reaching the self priming effect of self priming pump. The main parts of the self - suction pump are basically the same as the single - stage single - suction centrifugal pump.
