基于ANSYS的特殊螺纹接头结构设计与分析

Structure design and analysis of premium-connection thread joint based on ANSYS

针对API螺纹接头泄漏等问题,进行了螺纹接头密封机理的研究。建立了螺纹接头密封性能与受力情况、温度载荷变化情况之间的关系;提出了一种双台肩、三锥度的新型特殊螺纹接头的密封形式,利用ANSYS软件对新型特殊螺纹接头分别在两种受力工况和不同温度载荷下进行了分析,得出了特殊螺纹接头各扣牙的接触应力变化曲线、各扣牙齿顶齿根受力变化情况曲线及其抗泄漏能力随温度载荷变化情况曲线。研究结果表明:基于ANSYS的新型特殊螺纹接头受力分布呈"W"型,其值变化范围为150 MPa～350 MPa,未超过材料强度极限,整体受力较为均匀;并且螺纹接头的接触应力变化相对值范围为-25～0,符合防泄漏机理要求。

Aiming at the leakage problem of the API thread joint, the sealing mechanism about the thread joint was analyzed, the relationship between the sealing ability of the thread joint and the force/temperature loads was established. A premium connection （PC） with new sealing structure was brought forward which was equipped with double - shoulder/three-taper. ANSYS was introduced to analyze the PC structure, the relationship of different forces and temperature loads with the deformation was studied, and the PC connect stress curves, teeth top and root stress curves, and anti-leakage ability with temperature loads changing curves were obtained. The results show that the PC force distribution is ＂W＂ type, and the values change from 150 MPa to 350 MPa, do not exceed the material strength limits, the overall force is more fluent in PC. The relative values of the PC contact stress change from -25 to 0, which meets the proposed requirements in the anti-leakage mechanism.