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Aerodynamic Analysis for the Venturi of Pneumatic Yarn Knotting Devices

机译:气动纱线打结装置文丘里空气动力学分析

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摘要

Pneumatic devices have been applied to form different knots for carpet industry. Aerodynamic analyses were done for venturi, the core device of a pneumatic yarn knotting machines, for system optimal design. Four suggestions for a specific design are as follows: 1) the narrowest pipe linking with the inlet pipe is redundant, thus should be cut off; 2) the yarn suction pipe should incline a small angle to the major axis of the venturi, which would increase the dragging force along the knotting chamber; 3) smooth diameter change in the conjunction is proposed to decrease the turbulent around the corner; 4) a limitation of the outlet pipe size is given to avoid the negative pressure to the yarn moving direction. These proposed principles may be extended to the optimal design of other pneumatic knotting devices.
机译:气动装置已经被应用以形成用于地毯工业的不同的结。对文丘里管进行了气动分析,文丘里管是气动打结机的核心设备,用于系统优化设计。针对特定设计的四个建议如下:1)与进口管连接的最窄的管是多余的,因此应将其切断; 2)吸纱管应相对于文丘里管的主轴线倾斜一个小角度,这会增加沿打结室的拉力; 3)提出在连接处采用平滑的直径变化以减少拐角处的湍流; 4)限制出口管的尺寸,以避免对纱线运动方向产生负压。这些提出的原理可以扩展到其他气动打结装置的最佳设计。

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