THREADED CONNECTION FOR PIPE Russian patent published in 2023 - IPC E21B17/42 F16L15/06 

FIELD: threaded connections.

SUBSTANCE: invention relates to threaded connections for pipes. Threaded connection for pipes contains a nipple having a section with an external thread, which is an external taper thread, at one end of the first pipe, and a coupling having a section with an internal thread, which is an internal taper thread for screwing with a section with an external thread at one end of the second pipes. The female thread portion has a plurality of thread grooves, and each of the plurality of thread grooves has a corner portion on the seat side and a corner portion on the guide surface side of the thread base side, a corner portion on the seat side of the first thread groove, which is the outermost thread groove from the end of the coupling from a plurality of thread grooves, has a first arcuate section, which is directly connected to the bearing surface and has a first radius of curvature, and a second arcuate section, which is directly or indirectly connected to the first arcuate section and has a second radius of curvature, and the ratio of the radii of curvature, which is the ratio of the second radius of curvature to the first radius of curvature, is 3 or more.

EFFECT: invention makes it possible to prevent the destruction of the coupling under the action of a tensile load without increasing the outer diameter of the coupling.

5 cl, 10 dwg