Aluminum Alloy Drill Pipe Thread Self-Locking via Inclined Tooth Bottom
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Solution Overview
Problem
The assembly efficiency of aluminum alloy drill pipes is low due to the need for special facilities to heat or cool the joints during the connection process, which requires high or low temperature states for either the steel or aluminum alloy components, leading to inefficiencies in the assembly process.
Innovation Solution
A connection structure between the pipe body and joint of an aluminum alloy drill pipe featuring an internal thread section with an inclined tooth bottom and an external thread section with a larger tooth height, allowing for self-locking and increased friction through plastic deformation, eliminating the need for heating or cooling during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heating or cooling facilities are used to achieve temperature control during assembly, then connection strength is improved, but assembly efficiency deteriorates
Solution Approach 1:
The patent extracts and eliminates the heating or cooling facilities from the assembly process. By designing the thread structure with an inclined tooth bottom and varying tooth heights, the invention achieves self-locking and friction-based connection strength without requiring external temperature control equipment, thus resolving the contradiction between connection strength and assembly efficiency
Solution Approach 2:
The thread structure is designed to be self-sufficient in generating the necessary connection strength through its geometric features. The inclined tooth bottom and differential tooth heights create self-locking and friction forces that automatically ensure connection strength without external intervention, eliminating the need for heating or cooling facilities and improving assembly efficiency
2Reliability
If special facilities for temperature control are used, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The patent removes the complex heating or cooling facilities from the assembly process. The thread structure with inclined tooth bottom and varying tooth heights inherently provides self-locking and friction-based reliability, eliminating the need for temperature control equipment and simplifying the overall system
Solution Approach 2:
The thread structure is designed to automatically ensure connection reliability through its geometric features. The inclined tooth bottom and differential tooth heights create self-locking mechanisms and friction forces that inherently maintain connection reliability without requiring external temperature control systems, thus reducing device complexity
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
This design enhances the screwing-off torque and sealing properties of the threaded connection, simplifies the assembly process by eliminating the need for temperature control, and significantly improves assembly efficiency by ensuring a secure and reliable connection without the use of special facilities.
Implementation Method 1
the external thread tooth crest is squeezed against the internal thread tooth bottom to be plastically deformed along the inclined surface of the tooth bottom
Implementation Method 2
increases the friction area between the external thread tooth crest and the internal thread tooth bottom
Data Source
AI summary
A connection structure between a pipe body and a joint of an aluminum alloy drill pipe is provided, and the connection structure comprises a first joint provided with an internal thread section, wherein an internal thread tooth bottom of the internal thread section is an inclined surface; and a second joint provided with an external thread section which is able to be fitted with the internal thread section and has threads of a complete tooth shape, a tooth height of the external thread section being larger than that of the internal thread section. The internal thread tooth bottom is designed as an inclined surface such that an external thread tooth crest is squeezed against the internal thread tooth bottom and plastically deformed along the inclined surface of the tooth bottom during an engagement, so that the engaged threads are self locked to effectively prevent the loosing of the engaged threads.