Collet Pipe Fitting Structure for Airtight Tube Connection
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Solution Overview
Problem
Existing pipe connection methods, such as welding, require professional skills and tools, pose fire hazards, and struggle to maintain airtightness between connected pipes.
Innovation Solution
A pipe-fitting device with a fitting body, fixing nut, and collet that securely connects pipes by rotating and tightening the nut, using a collet with a bending portion to seal the gap between pipes, and additional packings to ensure airtightness and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to connect pipes, then connection strength is improved, but operation complexity and fire hazards increase
Solution Approach 1:
The patent replaces the welding process (thermal/chemical connection) with a mechanical connection system consisting of a fitting body, fixing nut, and collet. The collet compresses the second pipe against the fitting body through mechanical force applied by the fixing nut, eliminating the need for welding operations while maintaining connection strength.
2Productivity
If a fitting device with nut is used to connect pipes, then operation time is reduced, but airtightness between pipes deteriorates
Solution Approach 1:
The patent employs a collet made of flexible material that can be compressed to seal the gap between the fitting body and the second pipe. The flexible nature of the collet allows it to deform and conform to the pipe surface, creating an airtight seal while maintaining the quick-connect advantage of the nut-based fitting device.
3Reliability
If collet is designed to press and seal the pipe, then airtightness is improved, but vulnerability to impact damage increases
Solution Approach 1:
The patent incorporates a protecting portion that protrudes from the end portion of the bending portion to shield the pressing portion before any impact can occur. This protective structure acts as a cushion or barrier, absorbing or deflecting external forces before they reach the vulnerable pressing portion, thereby preventing damage while maintaining sealing capability.
4Reliability
If fixing nut is rotated and tightened to secure pipes, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The fixing nut serves multiple functions: it secures the connection between the fitting body and the second pipe, applies compressive force to the collet through threading engagement, and provides a familiar universal interface for tightening operations. By making the fixing nut multi-functional, the patent avoids adding separate components for each function, thereby maintaining simplicity while achieving reliable connection.
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
Enables quick, safe, and airtight connection of pipes without the need for welding, using a collet to press and seal the pipes while protecting the sealing portion from damage, and eliminates the requirement for separate fixing devices.
Implementation Method 1
a collet which is provided inside the fixing nut and presses the second pipe when the fixing nut is rotated and tightened
Implementation Method 2
a bending portion which is connected to the seating portion and in which a bending groove is formed inside the bending portion, wherein an end portion of the bending portion is positioned at the gap and moved thereinto when the fixing nut is tightened, and the bending portion is bent downward
Data Source
AI summary
A pipe-fitting device according to the present invention includes a fitting body, a fixing nut, and a collet. A first end of the fitting body is rotatably connected to an outer circumferential surface of a first pipe, and a second end of the fitting body surrounds an outer surface of a second pipe. A first end of the fixing nut is rotatably connected to an outer circumferential surface of the fitting body, and a second end of the fixing nut surrounds the outer surface of the second pipe. The collet is provided inside the fixing nut and presses the second pipe when the fixing nut is rotated and tightened. The collet includes a seating portion provided inside the fixing nut, a bending portion in which a bending groove is formed, a pressing portion which presses and seals the second pipe, and a protecting portion which protects the pressing portion.