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    • 2. 发明授权
    • Fatigue-resistant threaded connector
    • 耐疲劳螺纹连接器
    • US4892337A
    • 1990-01-09
    • US207687
    • 1988-06-16
    • Richard H. GundersonJerome Q. BurnsStewart A. Fox
    • Richard H. GundersonJerome Q. BurnsStewart A. Fox
    • E21B17/08F16L15/00
    • F16L15/003E21B17/085F16L15/004
    • A fatigue-resistant threaded connector for connecting adjacent sections of a tubing string subject to cyclic dynamic stress variations is disclosed. The connector comprises a pin member which is threadedly engageable with a corresponding box member. In its preferred embodiment, the connector is radially preloaded. The connector has tapered threads with a straight load path having substantially no eccentricity. The preferred thread form is a modified buttress thread having a zero (or near zero) degree load flank, a 45 degree stab flank, and a large root radius. Additionally, the thread may include a small stab flank relief to reduce stress concentrations, and a differential between the pitch of the pin threads and the pitch of the box threads to compensate for the Poisson's ratio effect of the radial preload. The connector utilizes an elliptical stress relief groove at the base of the pin threads and elliptical contours on all thickness transitions to reduce peak stresses. The fully assembled and preloaded connector has a maximum stress-concentration-factor of less than 1.5 and its weight is less than 2.5 times the weight of an equivalent length of tubing.
    • 公开了一种用于连接受到循环动态应力变化的油管柱的相邻部分的耐疲劳螺纹连接器。 连接器包括可与相应的箱构件螺纹接合的销构件。 在其优选实施例中,连接器径向预加载。 连接器具有锥形螺纹,其具有基本上不偏心的直的负载路径。 优选的螺纹形式是具有零(或接近零)度载荷侧面,45度刺侧面和大根部半径的修改的支撑螺纹。 此外,螺纹可以包括小的尖端侧面浮雕以减少应力集中,以及销螺纹的间距和箱形螺纹的间距之间的差异,以补偿径向预载荷的泊松比效应。 连接器在所有厚度过渡处,在销螺纹的基部和椭圆轮廓的基部处使用椭圆应力释放槽,以减少峰值应力。 完全组装和预加载的连接器具有小于1.5的最大应力集中系数,其重量小于管等效长度的2.5倍。