THREADED DOUBLE-SUPPORT JOINT WITH HIGH TRANSFERRED TORSION TORQUE Russian patent published in 2010 - IPC F16L15/06 

FIELD: construction.

SUBSTANCE: threaded double-support joint comprises male element including outer thread, inner contact end, the first male surface arranged between outer thread and inner contact end, the second male surface arranged behind the last turn of thread and outer contact end. Male element is arranged with clearance groove or incomplete height of profile at the outlet of outer thread. Female element is arranged identically to male element. Inner and outer contact ends of male element are arranged with the possibility of interaction in screwed condition with inner and outer contact ends of female element. Inner and outer contact ends of male element are arranged each in the form of annular belt with inner conical surface, coaxial relative to central axis of male element. Inner and outer contact ends of female element are arranged each in the form of annular belt with outer conical surface, coaxial relative to central axis of female element, angle of inner conical surface at inner circular belt of male element equals angle of outer conical surface at inner circular belt of female element, and angle of inner conical surface at outer circular belt of male element is equal to angle of outer conical surface at outer circular belt of female element. In male element angle of inner conical surface at inner circular belt equals angle of inner conical surface at outer circular belt, and in female element angle of outer conical surface at inner circular belt equals angle of outer conical surface at outer circular belt, range of angles of inner and outer conical surfaces at inner and outer circular belts of male and female elements makes 10°÷20° relative to plane perpendicular to central axis of threaded joint. In direction along central axis of threaded joint maximum deviation of distances difference between inner and outer contact ends of male and also female elements equals maximum deviation of thread pitch at thread length with complete profile of male and also female elements.

EFFECT: invention increases reliability of joint.

7 cl, 6 dwg