Root curved face sealing structure of deep-sea waterproof conduit female joint

Abstract

The invention discloses a root curved face sealing structure of a deep-sea waterproof conduit female joint. The structure is arranged at the tail end of an internal thread of the female joint and consists of an inner wall, an arc face and an inclined end face. The inclined end face is an inner orifice end face, and the end face is inclined outwards relative to the flat end face of the inner orifice. The inner wall is a circular hole inner wall parallel to the axis, and the inner wall and the inclined end face are connected through a cambered face protruding outwards, so that the curved face sealing structure is formed. The root curved face sealing structure of the deep-sea waterproof conduit female joint is designed into the curved face, so that stress release is facilitated, and the cracking probability of the female joint after screwing is reduced. In addition, the area of the inclined end face in the curved face sealing structure is larger than that of a conventional flat end face,the pressing area of a matched sealing ring can be increased by screwing in pairs, and the sealing performance of the curved face sealing structure is improved.

Description

technical field [0001] The invention belongs to the technical field of offshore oil equipment. Specifically, the invention relates to a water-resisting conduit joint, in particular to a curved surface sealing structure at the root of a deep-sea water-resisting conduit female joint. Background technique [0002] The deep sea riser joint is an essential equipment for offshore oil drilling, and it is divided into a male joint and a female joint. The main body involved in the present invention is a female joint with built-in internal thread, which is used for connecting the upper and lower joints of the water riser. When the male joint and the female joint are paired and tightened, the end of the male joint cooperates with the root of the female joint to form a built-in end face sealing structure. The end surface of the root of the prior art female joint is a plane structure, and the plane is perpendicular to the axis, so the joint between the end surface and the inner wall for...

AI Technical Summary

Problems solved by technology

However, this right-angled inner cavity exposes two major problems in use. One is that when the male and female joints are paired and tightened, the right-angled edge is easy to damage the matching sealing ring, resulting in a sealing ring that can only be used once.

The second is that there is a large stress concentration at the root of the female joint when the torque is loaded, and cracks are easy to form at the right angle. For the sake of safety, it is necessary to improve the sealing structure of the root of the deep-sea water riser joint.

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