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

ZHOU Xiao-jun，WEI Bo
（School of Mechatronics Engineering and Automation，Shanghai University，Shanghai 200072，China）

Abstract： 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.
Key words： premium-connection（PC） thread joint； ANSYS； sealing and disclosure mechanism；structure design；finite element analysis（FEA）