Inclined Retaining Ring Structure for Coreless Pipe Pullout Resistance
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Solution Overview
Problem
Conventional pipe retaining devices for pipe fittings face challenges in enhancing detachment prevention force without using an inner core, which limits their effectiveness and workability.
Innovation Solution
A pipe retaining device with a C-shaped retaining ring that includes projecting pieces, tooth portions, and connecting means, featuring an inclination mechanism to increase the detachment prevention force by biting into the joint pipe and deforming it when a pulling force is applied, thereby improving the resistance to pipe pulling forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inner core is inserted into the joint pipe to improve detachment preventing force, then the detachment preventing force is improved, but the workability deteriorates
Solution Approach 1:
The invention extracts and eliminates the inner core component from the pipe fitting system. Instead of using a separate inner core to prevent detachment, the design integrates the detachment prevention function directly into the retaining ring structure through the inclination mechanism, thereby improving workability while maintaining reliability
Solution Approach 2:
The invention merges the detachment prevention function with the retaining ring structure. The inclination mechanism is integrated into the retaining ring itself, combining what were previously separate functions (retention and detachment prevention) into a single unified component, eliminating the need for an inner core
2Ease of operation
If the retaining ring structure is simplified to improve workability, then the ease of operation is improved, but the detachment preventing force deteriorates
Solution Approach 1:
The invention introduces asymmetry through the inclination mechanism where the second surface of the retaining ring connecting portion is inclined relative to the first surface. This asymmetric geometry creates a mechanical advantage that enhances detachment prevention force while maintaining a simple overall structure, resolving the contradiction between simplicity and effectiveness
Solution Approach 2:
The inclination mechanism allows the retaining ring to dynamically respond to pulling forces. When a pulling force is applied, the inclined surface causes the retaining ring to tilt, increasing the biting force of the tooth portion on the joint pipe. This dynamic adjustment provides enhanced detachment prevention without adding structural complexity
3Reliability
If the retaining ring bites into the joint pipe to increase detachment preventing force, then the detachment preventing force is improved, but the pipe deformation increases
Solution Approach 1:
The inclination mechanism enables dynamic adjustment of the biting force. The retaining ring tilts in response to pulling forces, increasing contact pressure at the tooth portion only when needed. This dynamic response provides strong detachment prevention while minimizing unnecessary pipe deformation during normal 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 device significantly enhances the detachment prevention force for pipes without the need for an inner core, ensuring better workability and resistance to pulling forces, while maintaining a simple structure.
Implementation Method 1
a tooth portion which is provided on an inner side of the ring body and which bites into the joint pipe due to diameter reduction by the tightening means
Implementation Method 2
the retaining ring inclines... such that... the joint pipe is stretched more on the circumferential end portion side than at the circumferential center portion
Data Source
AI summary
Provided is a pipe retaining device, for a pipe fitting, which has a simple structure but is capable of further improving a detachment preventing force for a pipe without inserting an inner core. The pipe retaining device includes an inclination mechanism (7) configured to incline a retaining ring (3A) in a pipe axis direction with respect to a reference plane (P) orthogonal to a central axis of a ring body (30A), such that each circumferential end portion (30x) of the ring body (30A) is caused to be closer to a fitting body (2) and a circumferential center portion (30y) of the ring body (30A) is moved away from the fitting body (2), when each retaining ring connecting portion (32) and each facing portion (54) come into contact with each other. A first surface (56), facing the retaining ring connecting portion (32), of each facing portion (54) is parallel to a reference plane P. Respective second surfaces (34a, 34b), facing the facing portion (54), of a plurality of the retaining ring connecting portions (32) are located within the same inclined plane (PI) inclined in the pipe axis direction with respect to the reference plane (P). An interval (B) between the first surface (56) and the inclined plane (PI) becomes larger from the circumferential end portions (30x) toward the circumferential center portion (30y).