Pipe Joint Sealing Structure for Step-Induced Leak Prevention
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Solution Overview
Problem
Conventional resin pipe joints often experience liquid leakage due to steps formed on the inner bottom surface of seal ring fitting grooves, either from insufficient or excessive cutting, which can lead to gaps between the seal member and the step, compromising the sealing effectiveness.
Innovation Solution
The proposed solution involves a cylinder and joint system with an annular recessed portion and a second sealing portion that seals the space between the step on the bottom surface and the first sealing portion, using a seal member with an adhesive, such as epoxy resin, to prevent liquid leakage without requiring precise processing of the step, thereby improving sealing efficiency and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cutting is performed to remove burrs from the seal ring fitting groove, then manufacturing defects are reduced, but steps are generated on the inner bottom surface causing liquid leakage
Solution Approach 1:
A non-cut portion is introduced as an intermediary element between the cut portion and the seal member. This non-cut portion serves as a mediator that prevents direct contact between the seal member and the step formed by cutting, thereby eliminating liquid leakage while maintaining the burr removal function. The non-cut portion acts as a buffer zone that resolves the conflict between removing manufacturing defects and preventing sealing failures.
2Reliability
If cutting is insufficient to leave some burrs, then steps are reduced, but manufacturing defects remain compromising sealing
Solution Approach 1:
The non-cut portion serves as a protective intermediary that allows the cut portion to retain some burrs without compromising sealing. The non-cut portion prevents these burrs from creating direct contact between the seal member and the step, thus maintaining sealing effectiveness while reducing the need for precise burr removal.
3Reliability
If precise cutting control is implemented to prevent steps, then sealing is improved, but manufacturing complexity and time increase
Solution Approach 1:
The non-cut portion is introduced as a simple structural intermediary that automatically prevents liquid leakage without requiring precise control of cutting depth or burr removal quality. This design simplifies manufacturing processes and reduces production time while maintaining reliable sealing, as the non-cut portion inherently protects against leakage regardless of cutting precision.
Solution Approach 2:
The seal ring fitting groove is segmented into three distinct portions: a cut portion for burr removal, a non-cut portion to prevent liquid leakage, and a groove portion for seal member accommodation. This segmentation allows each portion to perform its specific function independently, simplifying manufacturing requirements while ensuring both burr removal and sealing effectiveness.
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 configuration effectively seals gaps between the seal member and the step, reducing liquid leakage and simplifying manufacturing processes by eliminating the need for precise step processing, thus enhancing the sealing properties and productivity of the pipe joint system.
Implementation Method 1
a second sealing portion that seals a space between a step on a bottom surface of the recessed portion and the first sealing portion
Data Source
AI summary
A cylinder includes a cylindrical portion, an insertion portion, and a first sealing portion. The cylindrical portion has a central axis, extends in an axial direction along the central axis, and allows liquid to flow. The insertion portion extends along the central axis and is inserted into the inside of the cylindrical portion. The first sealing portion seals a space between the cylindrical portion and the insertion portion. The insertion portion includes a recessed portion and a second sealing portion. The recessed portion is annular. The recessed portion is located along an outer peripheral surface of the insertion portion and accommodates the first sealing portion. A second sealing portion seals a space between a step on a bottom surface of the recessed portion and the first sealing portion.