译文：
一、自吸泵的概念及分类： 1、自吸泵是指不需要在吸入管路内充满水就能自动地把水抽上来的离心泵称为自吸泵。吸泵大部分与内燃机配套，装在可移动的小车上，宜于野外作业。 2、自吸泵的结构类型主要分为两种：外混式自吸泵和内混式的自吸泵。 二、自吸泵的工作原理： 1、外混式自吸泵的工作原理是：水泵启动前先在泵壳内灌满水（或泵壳内自身存有水）。启动后叶轮高速旋转使叶轮槽道中的水流向涡壳，这时入口形成真空，使进水逆止门打开，吸入管内的空气进入泵内，并经叶轮槽道到达外缘。另一方面，被叶轮排到气水分离室中的水又经左右回水孔流回到叶轮外缘。左回水孔流回的水在在压力差和重力的作用下，射向叶轮槽道内，并被叶轮击碎，与吸入管路来的空气混合后，甩向蜗壳，向旋转方向流动。然后与右回水孔流来的水汇合，顺着蜗壳流动。由于液体在蜗壳内不断冲击叶栅，不断被叶轮击碎，就同空气强烈搅拌混合，生成气水混合物，并不断地流动致使气水不能分离。混合物在蜗壳出口被隔舌剥离，沿短管进入分离室。在分离室内空气被分离出来，由出口管排掉，而水仍经左右回水孔流向叶轮外缘，并与吸入管空气相混合。如此反复循环，逐渐将吸入管路中的空气排尽，使水进入泵内，完成自吸过程。 2、 内混式的自吸泵，工作原理与外混式自吸泵相同，其区别只是回水不流向叶轮外缘，而流向叶轮入口。内混式自吸泵在启动时，须打开叶轮前下方的回流阀，使泵内液体流回到叶轮入口。水在叶轮高速转动的作用下与吸入管来的空气相混合，形成气水混合物排至分离室。在这里空气排出而水又从回流阀返回到叶轮入口。如此反复进行，直至空气排尽，吸上水来。 自吸泵的自吸高度，与叶轮前密封间隙、泵的转数、分离室液面高度等因素有关。叶轮前密封间隙越小，自吸高度越大，一般取为0.3~0.5毫米；在间隙增大时，除自吸高度下降外，泵的扬程、效率均降低。泵的自吸高度随叶轮的圆周速度u2的增大而增大，但到{zd0}自吸高度时，转数增加而自吸高度就不再增加了，此时只是缩短自吸时间；当转数下降时，自吸高度则随着下降。在其它条件不变的情况下，自吸高度还随着储水高度的增加而增加（但也不能超过分离室的{zj0}储水高度）。为了在自吸泵中更好地使气水混合，叶轮的叶片须少些，使叶栅的节距增大；并宜采用半开式叶轮（或叶轮槽道较宽的叶轮），这样更方便于回水深入地射进叶轮叶栅中。

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原文：
First, the concept of self-priming pump and classification: 1, self-priming pump is not required to breathe in the water pipes can be automatically filled with water pumped is called self-priming pump centrifugal pumps. Suction pump most of supporting combustion engine, mounted on movable small car, it is appropriate fieldwork. 2, the structure of self-priming pump type can be divided into two kinds: external mixing and internal mixing type self-priming pump-type self-priming pump. Second, self-priming pump works: 1, external-mixing works by self-priming pump: water pumps in the pump before you start the shell filled with water (or pumping of water from its own shell). Post-high-speed rotating impeller to the impeller in the water trough Road to the vortex shell, then the entrance to form a vacuum, so that water backstop the door open, the air inside the suction pipe into the pump, and after-channels to reach the outer edge of the impeller. On the other hand, was routed to gas-water separation chamber impeller in the water then flows back through the impeller around the outer edge of the backwater hole. Flow back into the water left in the backwater holes in the pressure difference and gravity, the shooting at the impeller-channels within the impeller was shattered, and inhalation of air pipes to a mixture of Shuaixiang scroll to the rotation direction of flow. Then with the right to water in the backwater hole converging flow along the spiral flow. As the liquid in the volute and continuous impact of cascade, constantly being crushed impeller on the strong mixing with air to produce gas-water mixture, and the constant flow causing air and water can not be separated. The mixture was divided in the volute exit stripped tongue, along the short tube into the separation chamber. In the separation of indoor air has been separated out from the exit tube row, while the water still flows through the impeller around the outer edge of the backwater hole, and mixed with the air suction pipe. This repeated cycle, gradually inhaling the air row to make the pipeline, so that the water into the pump to complete the self-priming process. 2, within the mixed-type self-priming pump, the working principle of self-priming pump and external-mixing the same, the difference between just does not flow to the impeller outer edge of the backwater, while the flow of the impeller entrance. Start within a mixed-type self-priming pump, it should be open impeller before the bottom of the return valve, so that the liquid flow back to pump impeller entrance. Water in the high-speed rotating impeller and the suction pipe under the effect of the air-phase mixture to form a row of gas-water mixture to the separation chamber. Here the water and from the air discharge return valve to return to the impeller entrance. This is repeated until the air row to do, smoking and Sheung Shui to. Self-priming pump self-priming height, before the sealing and impeller clearance, the pump rpm, separation chamber liquid height and other factors. Impeller seal gap before the smaller, self-priming height of the larger, generally taken to be 0.3 ~ 0.5 mm; in the gap increases, in addition to a high degree of decline in self-priming, the pump head and efficiency are reduced. A high degree of self-priming pump with the impeller speed u2 circumference increased with the increase, but the greatest heights of self-priming, transfer the increase in the number of self-priming height will no longer be increased, but this time shorten the self-absorption time; when the rotation fall, a high degree of self-absorption, along with the decline. In other conditions remain unchanged, the high degree of self-absorption is also increased with the increase in water height (but not exceeding the separation chamber of the best water height). In order to better self-priming pump so that gas-water mixture, the impeller blades to be less, so that the pitch of the cascade increases; and should adopt the semi-open impeller (or impellers impeller wide grooves), which is more convenient for in-depth fired into the impeller backwater cascade.