Slim Threaded Joint Box With Reinforcement Ribs
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Solution Overview
Problem
Threaded joints for large diameter steel pipes with thin box wall thickness struggle to prevent external pressure leaks due to limited expansion and thin nose or shoulder surfaces, rendering existing sealing techniques ineffective.
Innovation Solution
A threaded joint design featuring a box with a nose portion, shoulder surface, and an annular portion that elongates the sealing surface, allowing the external seal to be pressed against the pin under high pressure, amplifying contact pressure and preventing radial deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the box outside diameter is limited to be less than 104% of the pin outside diameter (slim type joint), then the joint compactness is improved, but the box wall thickness becomes too thin to provide sufficient sealing contact pressure under external pressure
Solution Approach 1:
The patent applies local quality by providing reinforcement ribs at specific locations on the box - namely on the external seal surface and at the nose portion - rather than uniformly thickening the entire box. This localized reinforcement increases sealing contact pressure and prevents radial deformation at critical areas while maintaining the overall slim profile and thin wall thickness of the box.
Solution Approach 2:
The reinforcement ribs are designed to preemptively counteract the effects of external pressure before sealing failures occur. By pre-positioning these structural supports at the external seal surface and nose portion, the box is prepared in advance to resist radial deformation and maintain sealing contact pressure under high external pressure conditions.
2Volume of moving object
If the box wall thickness is reduced to achieve smaller joint dimensions, then the joint compactness is improved, but the nose portion and shoulder surface become too thin to amplify contact pressure effectively
Solution Approach 1:
The patent applies local quality by providing reinforcement ribs at specific locations on the box - namely on the external seal surface and at the nose portion - rather than uniformly thickening the entire box. This localized reinforcement increases sealing contact pressure and prevents radial deformation at critical areas while maintaining the overall slim profile and thin wall thickness of the box.
3Volume of moving object
If the box is designed with thin wall thickness for slim type configuration, then the joint compactness is improved, but the box cannot resist radial expansion under high internal pressure
Solution Approach 1:
The patent applies local quality by providing reinforcement ribs at specific locations on the box - namely on the external seal surface and at the nose portion - rather than uniformly thickening the entire box. This localized reinforcement increases sealing contact pressure and prevents radial deformation at critical areas while maintaining the overall slim profile and thin wall thickness of the box.
Solution Approach 2:
The reinforcement ribs are designed to preemptively counteract the effects of external pressure before sealing failures occur. By pre-positioning these structural supports at the external seal surface and nose portion, the box is prepared in advance to resist radial deformation and maintain sealing contact pressure under high external pressure conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively amplifies contact pressure at the external seal, ensuring reliable sealing performance and preventing external pressure leaks in threaded joints with thin box wall thickness.
Implementation Method 1
The steel pipes are sequentially connected to each other, and threaded joints are used for the connection
Implementation Method 2
the tapered male threaded portion engaging with the tapered female threaded portion in a made up state
Implementation Method 3
the sealing surface being in contact with the sealing surface of the box in a made up state
Implementation Method 4
amplifies contact pressure at the external seal, ensuring reliable sealing performance
Data Source
AI summary
A threaded joint is constructed of a pin and a box, the box having an outside diameter less than 104% of an outside diameter of a tubular body having the pin. The box includes, in order from an end of the box toward the tubular body: a lip portion and a female threaded portion, the lip portion including a shoulder surface and a sealing surface. The pin includes a shoulder surface, a sealing surface, and a male threaded portion. The lip portion of the box has a nose portion disposed between the shoulder surface and the sealing surface and an annular portion disposed between the sealing surface and the female threaded portion. The nose portion and the annular portion are not in contact with the pin, and a length of the annular portion is longer than a thread pitch of the female threaded portion.