Double Pipe Coupling Structure with Debris Containment Recess
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Solution Overview
Problem
Existing double pipe structures face issues with debris generation and fluid flow characteristics during pressing-type punching-out operations, where debris can damage the inner pipe or get hidden, and fluid can stagnate due to unnecessary space formation.
Innovation Solution
The inner pipe is designed with side walls extending parallel to the diametral direction of the outer pipe and a semi-circular recess wall that prevents debris from striking or getting hidden, and a cutting piece is used to close the space between the end port and punched hole, acting as a flow regulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pressing-type punching-out work is performed at the common part of outer pipe and inner pipe for branched connection, then branched connection can be achieved, but punched-out debris strikes against or adheres to the inner pipe causing damage
Solution Approach 1:
A recess wall is introduced as an intermediary structure between the punching location and the inner pipe. This recess wall captures and contains the punched-out debris, preventing it from striking or adhering to the inner pipe surface, thus resolving the contradiction between achieving branched connection and preventing debris damage
Solution Approach 2:
The harmful punched-out debris is extracted and isolated from the problematic area by directing it into a dedicated recess wall space. This separates the debris containment function from the inner pipe surface, eliminating the harmful interaction while preserving the branched connection capability
2Ease of manufacture
If end port of inner pipe is closed near punched hole for branched connection, then connection structure is completed, but useless space is formed causing fluid to stagnate or be disturbed
Solution Approach 1:
The recess wall is designed with specific local geometry (depth and width constraints) to ensure it contains debris without creating large stagnant spaces. By carefully controlling the local dimensions of the recess, the design achieves debris containment while maintaining smooth fluid flow characteristics
Solution Approach 2:
The space that could potentially become a harmful stagnant zone is converted into a beneficial debris containment chamber. The recess wall creates a dedicated space that captures harmful debris while its controlled geometry prevents fluid stagnation, transforming a potential problem into a solution
3Loss of substance
If inner pipe is made smaller to reduce material usage, then manufacturing cost decreases, but punched-out debris more easily strikes against the inner pipe
Solution Approach 1:
The recess wall serves as a protective intermediary that decouples the inner pipe diameter from debris impact risk. Even with a smaller inner pipe diameter that reduces material usage, the recess wall intercepts and contains debris before it can strike the inner pipe, allowing cost reduction without increasing damage risk
Data Source
AI summary
When the common part of the outer pipe and the inner pipe is worked with the pressing-type punching-out work for connecting with the inner pipe, there occurs no possibility that any disadvantage caused by the punched-out debris is generated.An inner pipe is arranged at the inside of an outer pipe. Each part of the outer pipe and the inner pipe is partially made common and integrally formed to each other. The inner pipe has the side walls extending from a common part of the outer pipe and the inner pipe to the diametral direction of the outer pipe in parallel and the recess wall facing the common part of the outer pipe and the inner pipe at a deep end of the side walls is not expanded more than the space between the side walls.