Crimped Double Pipe Assembly for Faster Sealing and Fin Alignment
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Solution Overview
Problem
The manufacturing process of double pipes with a heat exchange pipe interposed on the interior of an outer pipe is labor-intensive, leading to alignment issues and a decrease in sealing quality.
Innovation Solution
A double pipe design featuring an inner pipe with a flow path gap inside an outer pipe, equipped with a fin member, where the outer pipe has a crimping part projecting inward and the inner pipe forms an overlapping crimping part to hold the fin member, reducing manufacturing hours and enhancing sealing quality through crimping and brazing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the traditional manufacturing method is used with multiple separate steps for fixing the spiral-shaped thin plate and joining the pipe to the outer pipe, then the heat exchange function is achieved, but the number of manufacturing man-hours increases and the alignment quality deteriorates
Solution Approach 1:
The patent combines multiple separate manufacturing steps (fixing the spiral-shaped thin plate, joining the pipe to the outer pipe, and forming the sealing part) into a single integrated crimping operation. The crimping tool simultaneously performs all these functions by applying radial force to deform the pipe, which fixes the fin member, joins the pipes, and forms the sealing part in one action, thereby reducing manufacturing man-hours and improving alignment quality.
Solution Approach 2:
The patent employs preliminary action by pre-positioning the spiral-shaped thin plate (fin member) and the pipe within the outer pipe before the crimping operation. This preliminary arrangement ensures that when the crimping force is applied, all components are already in their correct positions, allowing the single crimping step to simultaneously achieve fixing, joining, and sealing with high precision alignment.
2Ease of manufacture
If multiple separate manufacturing steps are performed to fix components and form sealing parts, then the structural integrity is maintained, but the number of manufacturing man-hours increases
Solution Approach 1:
The patent merges multiple manufacturing operations into a single crimping step that simultaneously fixes the spiral-shaped thin plate, joins the pipe to the outer pipe, and forms the sealing part. This integration dramatically simplifies the manufacturing process and reduces the time required, as all these functions are achieved in one continuous operation rather than through multiple separate steps.
Solution Approach 2:
The crimping operation performs multiple functions simultaneously through a self-integrated process. The radial deformation applied during crimping automatically achieves fixing, joining, and sealing without requiring separate operations, making the manufacturing process more efficient and reducing overall manufacturing time while maintaining structural integrity.
3Reliability
If the pipe and outer pipe are joined through multiple separate operations, then the connection strength is ensured, but the quality of the sealing part decreases due to alignment difficulties
Solution Approach 1:
The patent combines the joining and sealing operations into a single crimping step. The radial deformation simultaneously creates the joint between the pipe and outer pipe while forming the sealing part, ensuring proper alignment and high sealing quality. This merged approach eliminates the alignment difficulties that arise from performing these operations separately, as both functions are achieved in one synchronized action.
4Strength
If traditional multi-step manufacturing is used to fix the fin member and join pipes, then the structural stability is achieved, but the manufacturing cost increases due to higher labor requirements
Solution Approach 1:
The patent merges the fixing of the fin member and the joining of pipes into a single crimping operation. The radial deformation simultaneously secures the spiral-shaped thin plate and creates the joint between the pipe and outer pipe, maintaining structural stability while dramatically improving manufacturing efficiency by reducing the number of required operations and labor time.
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 approach reduces manufacturing time and improves the precision and quality of the sealing part between the outer and inner pipes, ensuring efficient and reliable heat exchange.
Implementation Method 1
the inner pipe is deformed by crimping the outer pipe to form an inner crimping part
Implementation Method 2
enhancing sealing quality through crimping and brazing
Data Source
AI summary
A double pipe includes an outer pipe, an inner pipe, a fin member and a sealing part. The outer pipe has a plurality of outer crimping parts projecting to an inner diameter side and aligned in at least one of a lengthwise direction and a circumference direction. The inner pipe is arranged on an interior of the outer pipe with a flow path gap being defined between the outer pipe and the inner pipe. The inner pipe has a plurality of inner crimping parts aligned in the at least one of the lengthwise direction and the circumference direction and overlapping the outer crimping parts. The fin member is arranged on the interior of the inner pipe and held by the inner crimping parts. The sealing part seals between the outer pipe and the inner pipe.