可调速皮碗结构强度与通流特性数值仿真研究

Numerical Simulation of the Structural and Flow Characteristics of an Adjustable Cup for Pipeline Pigging

皮碗作为管道机器人常用动力装置,利用管道流体作用于其两端压力形成的压差作为整体装置动力来源,因其适用管道口径范围广、结构简单被广泛的关注与应用。皮碗在管中移动过程中随着管道压差变化发生相应变形,如果变形过大,可能导致皮碗脱离管壁造成驱动失效;如果管内压差及管壁间的摩擦力超出了皮碗的变形范围,则可能使皮碗发生破损。因此,皮碗结构的设计对于其自身结构强度及管道前后的通流特性具有重要意义。以外径100 mm皮碗为研究对象,通过系统仿真分别计算分析不同直径、厚度皮碗在不同压差时的最大接触应力、位移变化及管道前后两端的通流性能,得到皮碗在不同厚度和工作压差时皮碗相关性能的变化规律,为管道机器人皮碗的设计提供理论依据。

As a common driving device of pipeline robot,the cup takes the pressure difference between the two ends of the pipe fluid acting on it as the power source of the whole device.Because of its wide range of applicable pipe diameter and simple structure,it has been widely concerned and applied.During the movement of the cup in the pipe,the corresponding deformation occurs with the change of the pressure difference of the pipe.If the deformation is too large,it may cause the cup to break away from the pipe wall and cause the driving failure.If the pressure difference in the pipe and the friction between the pipe walls exceed the deformation range of the cup,it may cause the cup to be damaged.Therefore,the design of the cup structure is of great significance for its own structural strength and the flow characteristics between the front and rear of the pipe.The displacement and deformation trend of the rubber cup and the flow characteristics between the front and back of the pipe are studied by means of simulation.With 100 mm outer diameter as the research object,the maximum contact stress,displacement change and the flow performance of the front and rear ends of the pipe for different diameters and thicknesses under different pressure differences were calculated and analyzed through system simulation test.The variation rule of the relative performance of the cup under different thickness and operating pressure difference is obtained.