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.
所谓自吸泵，就是在启动前不需灌水(安装后第一次启动仍然需灌水)，经过短时间运转，靠泵本身的作用，即可以把水吸上来，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为以下几类：
According to the principle of self suction pump is divided into the following categories:
1.气液混合式(包括内混式和外混式);
1 hybrid gas-liquid (including inside and outside mixed mixed type);
2.水环轮式;
2 water wheel;
3.射流式(包括液体射流和气体射流)。
3 jet (including liquid and gas flow).
气液混合式自吸泵的工作过程：由于自吸泵泵体的特殊结构，水泵停转后，泵体内存有一定量的水，泵再次启动后由于叶轮旋转作用，吸入管路的空气和水充分混合，并被排到气水分离室，气水分离室上部的气体溢出，下部的水返回叶轮，重新和吸入管路的剩余空气混合，直到把泵及吸入管内的气体全部排出，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.
水环轮式自吸泵是将水环轮和水泵叶轮组合在一个壳体内，借助水环轮将气体排出，实现自吸。当泵正常工作后，可通过阀截断水环轮和水泵叶轮的通道，并且放掉水环轮内的液体。
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，由离心泵和射流泵(或喷射器)组合而成，依靠喷射装置，在喷嘴处造成真空实现抽吸。
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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