SCREW CONNECTION AND ITS APPLICATION Russian patent published in 2023 - IPC E21B17/02 F16L15/04 

FIELD: threaded connection and its application.

SUBSTANCE: threaded connection contains the first and second pipe components. The first tubular component contains the first pipe body and the male end. The male end contains the far surface and a threaded area located on the outer peripheral surface of the male end. The second tubular component is comprised of the second pipe body and the female end containing the far surface and a threaded area located on the inner peripheral surface of the female end. Both the male and female threaded zones respectively comprise a variable zone where the thread has a variable width and a fixed zone adjacent to the variable zone where the thread has a constant width. The changing area of the male threaded area is screwed to the changing area of the female threaded area. The fixed area of the male threaded area is screwed to the fixed area of the female threaded area. The thread profile of the male and female threaded zones is trapezoidal and contains a support side, an embedded side, a cavity and a top. The outer shoulder of the male end at the male end is in axial thrust contact with the corresponding thrust surface of the far female surface. The outer shoulder of the male threaded end is held between the first pipe body and the male threaded part. In the abutment state of the external shoulder of the male end at the male end and the corresponding abutment surface of the far female surface, the axial clearance of the thread between the insert side of the male thread and the insert side of the female thread in the changing zone has a value greater than zero.

EFFECT: increased reliability of the threaded connection.

18 cl, 8 dwg