Inclined Retaining Ring Structure for Coreless Pipe Joint Grip
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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 featuring a C-shaped retaining ring with projecting pieces, tooth portions, and an inclination mechanism that tightens onto the joint pipe, creating a greater detachment prevention force by biting into the pipe and deforming it when a pulling force is applied, without the need for an inner core.
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 removes the inner core component from the system entirely. Instead of inserting an inner core into the joint pipe, the solution uses the retaining ring with tooth portions that directly engage with the outer peripheral surface of the joint pipe, eliminating the need for the inner core and thereby improving workability while maintaining detachment prevention capability
Solution Approach 2:
The conventional approach inserts an inner core from the inside of the joint pipe to prevent detachment. This invention inverts the approach by using a retaining ring that engages with the outer peripheral surface of the joint pipe from the outside, biting into it with tooth portions to achieve the same detachment prevention effect without compromising workability
2Reliability
If a retaining ring with tooth portions is used to bite into the joint pipe, then the detachment preventing force is improved, but the complexity of the device increases
Solution Approach 1:
The invention merges multiple functions into a single retaining ring component. The ring body provides the basic retaining structure, while the tooth portions integrated into the ring body provide the biting engagement with the joint pipe. This integration eliminates the need for separate inner core components and reduces overall device complexity while enhancing detachment prevention
Solution Approach 2:
The tooth portions are strategically placed only at specific locations on the retaining ring where engagement with the joint pipe is needed, rather than making the entire ring complex. This localized feature addition maintains simplicity while achieving enhanced detachment prevention through selective biting engagement
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 improves the detachment prevention force for pipes by increasing resistance through the biting action of the retaining ring's tooth portions and deformation of the joint pipe, enhancing workability and preventing pipe detachment.
Implementation Method 1
a retaining ring (3) which comprises a ring body (30A) having a C-shaped ring shape, tightening means (9), wherein the retaining ring (3) can be tightened and fixed to an outer peripheral surface of a joint pipe (100) by reducing a diameter of the ring body (30A) having the C-shaped ring shape by the tightening means (9)
Implementation Method 2
a tooth portion (39) which is provided on an inner side of the ring body (30A) and which bites into the joint pipe (100) due to diameter reduction by the tightening means (9)
Implementation Method 3
a pressing ring (4) configured to press a packing (6) against a receiving portion (21) of a fitting body (2)
Data Source
Figure 1~2
Figure 3~4A
Figure 4B~5A
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).