Spiral Pipe Strip Profile That Maintains Diameter During Winding
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Solution Overview
Problem
Conventional strip members used for making spiral pipes experience a reduction in diameter due to their design, leading to a loss of flow passage cross-sectional area and difficulty in accommodating varying bore or cross-sectional configurations of existing pipes.
Innovation Solution
A strip member with a cross-sectional configuration where the neutral weak axis is inclined towards the inner surface, allowing for a perimeter enlarging property by adjusting the distribution and height of ribs and fitting portions, enabling the spiral pipe to maintain or increase its diameter even with varying pipe dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional strip member with male-female fitting structure is used for making spiral pipes, then the pipe can be assembled by fitting adjacent turns, but the perimeter (diameter) of the spiral pipe is reduced as pipe-making proceeds
Solution Approach 1:
The strip member employs an asymmetric cross-sectional configuration where the neutral weak axis is intentionally inclined toward the inner surface side. This asymmetric design compensates for the perimeter reduction tendency by creating a geometric configuration that maintains or enlarges the spiral pipe's perimeter during the winding process, while still enabling the male-female fitting assembly mechanism.
Solution Approach 2:
The invention changes the geometric parameters of the strip member's cross-section, specifically inclining the neutral weak axis relative to the reference width direction. This parameter change transforms the strip member's behavior during winding, converting the conventional perimeter reduction property into a perimeter enlargement property, thereby maintaining flow passage cross-sectional area while preserving the fitting assembly capability.
2Manufacturing precision
If an inner periphery limiter is used to maintain pipe diameter, then the spiral pipe diameter can be controlled, but the strip member is spaced from the inner peripheral surface of the existing pipe causing loss of flow passage cross-sectional area
Solution Approach 1:
The invention extracts and eliminates the inner periphery limiter from the pipe-making system. By removing this intermediary component, the strip member can be wound directly onto the inner peripheral surface of the existing pipe, ensuring full contact and maximizing the flow passage cross-sectional area while the asymmetric cross-sectional configuration provides inherent diameter control.
Solution Approach 2:
The strip member's asymmetric cross-sectional configuration enables it to self-regulate the spiral pipe diameter during winding without requiring external limiting devices. The inclined neutral weak axis creates a geometric constraint that automatically maintains the desired pipe diameter, allowing the strip member to serve its own diameter control function while maintaining contact with the existing pipe surface.
3Device complexity
If the strip member cross-section is designed with symmetric configuration, then the structure is simple and easy to manufacture, but the perimeter reduces as pipe-making proceeds
Solution Approach 1:
The invention deliberately introduces asymmetry into the strip member's cross-sectional configuration by inclining the neutral weak axis toward the inner surface side. This asymmetric design, while slightly increasing manufacturing complexity, is sufficient to transform the perimeter reduction property into perimeter enlargement property, thereby maintaining or increasing the spiral pipe diameter during the winding process.
Data Source
AI summary
A strip member that can be made into a spiral pipe with an enlarged perimeter by being spirally wound. A first fitting portion (93) is disposed in one end portion of a cross-section orthogonal to an extending direction of a strip member (90) and a second fitting portion (94) is disposed in the other end portion of the cross-section. A spiral pipe (9) is made by spirally winding the strip member (90) and fitting the second fitting portion (94) with the first fitting portion (93) preceding by one turn. The strip member (90) has a cross-sectional configuration in which a reference width direction W9 connecting the first fitting portion (93) and the second fitting portion (94) on the cross-section is inclinable to an outer surface side toward the first fitting portion side when the strip member is wound.