General centrifugal pump, if inhaled at impeller level, the start should be pre irrigation, very inconvenient. Memory in order to pump water, inhalation of imported equipment required valve, pump work, valve caused great losses.
所謂自吸泵，就是在啟動前不需灌水(安裝后第一次啟動仍然需灌水)，經過短時間運轉，靠泵本身的作用，即可以把水吸上來，投入正常工作。
The so-called self suction pump, is in start without irrigation (before the first start after installation of irrigation is still required), a short time after operation, the effect on pump itself, which can absorb water up, put to work.
自吸泵按作用原理分為以下幾類：
According to the principle of self suction pump is divided into the following categories:
1.氣液混合式(包括內混式和外混式);
1 hybrid gas-liquid (including inside and outside mixed mixed type);
2.水環輪式;
2 water wheel;
3.射流式(包括液體射流和氣體射流)。
3 jet (including liquid and gas flow).
氣液混合式自吸泵的工作過程：由于自吸泵泵體的特殊結構，水泵停轉后，泵體內存有一定量的水，泵再次啟動后由于葉輪旋轉作用，吸入管路的空氣和水充分混合，并被排到氣水分離室，氣水分離室上部的氣體溢出，下部的水返回葉輪，重新和吸入管路的剩余空氣混合，直到把泵及吸入管內的氣體全部排出，完成自吸，并正常抽水。
Gas-liquid mixed type self-priming pump working process: due to the special structure of the pump body, the pump stops after the turn, the memory of the pump body has a certain amount of water, pump starts up again due to the action of the rotating impeller, inhalation pipe air and water are fully mixed, and is discharged into the gas water separation chamber, gas water separation chamber and the upper part of the gas overflow, the lower part of the water return impeller, re and suction pipe residual air mixed until the pump and suction tube gas discharge, the self-priming is completed, and the normal pumping.
水環輪式自吸泵是將水環輪和水泵葉輪組合在一個殼體內，借助水環輪將氣體排出，實現自吸。當泵正常工作后，可通過閥截斷水環輪和水泵葉輪的通道，并且放掉水環輪內的液體。
The water ring wheel type self priming pump is a water ring wheel and a water pump impeller in a shell body, and the gas is discharged through the water ring to realize self absorption. When the pump to work, can cut off the water through the valve and pump impeller ring round channel, and release the water within the liquid ring round.
射流式自吸泵，由離心泵和射流泵(或噴射器)組合而成，依靠噴射裝置，在噴嘴處造成真空實現抽吸。
The jet type self suction pump is composed of a centrifugal pump and a jet pump (or injector), which is formed by the combination of a jet device and a vacuum pumping device at the nozzle.
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