The useful model is a shaft, mainly a submersible pump, subjected to a prolonged action of the twisting and bending moments, including pulsed nature, under the influence of aggressive media, and can be used in the oil industry as a submersible pump shaft, gas separator shaft, hydroprotection shaft and in other machines and mechanisms working in such conditions. The technical task is to refine the design characteristics of the shaft, increase the strength and toughness of the material for its production. The solution of the task is achieved by the fact that in calculating the strength of the shaft or in verifying the correctness of the choice of material for its production, the diameter of the shaft in any section satisfies two values of the maximum permissible voltage,; and the amount of Nieq.= 22.3 ± 2.5-0.8 Crequiv;Utilization of the useful model makes it possible to increase the survivability of the submerged pump shaft by choosing the correct diameter of the shaft and the material for its manufacture.
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机译：有用的模型是轴，主要是潜水泵，在侵蚀性介质的影响下，会经受扭曲和弯矩（包括脉冲性质）的延长作用，并且可以在石油工业中用作潜水泵轴，天然气分离器轴，液压保护轴以及在此类条件下工作的其他机器和机构中。技术任务是改善轴的设计特性，增加其生产材料的强度和韧性。该任务的解决方案是通过以下事实来实现的：在计算轴的强度或验证用于生产其材料的选择的正确性时，轴在任何部分的直径均满足最大允许电压的两个值，; Ni eq。 = 22.3±2.5-0.8 Cr equiv 的量;通过使用有用的模型，可以通过选择淹没泵轴来提高泵的使用寿命。轴的正确直径及其制造材料。
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