Bent Pipe Vertically Long Flat Cross Section
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Solution Overview
Problem
Conventional methods for manufacturing bent pipes, such as radiator hoses, face challenges in forming small radius bends without creating poor appearance parts like wrinkles, especially when the inner radius is less than twice the inner diameter, which can lead to buckling deformation and compromised durability due to varying circumferential lengths.
Innovation Solution
A bent pipe design with a vertically long flat cross-sectional shape in the radial direction of the bent portion, matched with continuous non-bent portions of perfect circle shape, ensures uniform thickness and circumferential length, preventing buckling deformation and allowing for a smaller inner radius without impairing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inner radius of the bent portion is reduced to achieve compact arrangement, then the arrangement space is decreased, but poor appearance parts like wrinkles appear and durability is compromised
Solution Approach 1:
The patent applies local quality by giving different cross-sectional shapes to different portions of the hose. The bent portion has a vertically long flat shape while straight portions maintain a perfect circular shape. This localized shape modification allows the bent portion to accommodate smaller inner radii without developing wrinkles, enabling compact arrangement while maintaining durability in critical areas.
Solution Approach 2:
The patent introduces asymmetry by changing the cross-sectional shape from a uniform circle to a vertically long flat shape in the bent portion. This asymmetric configuration, where the vertical dimension is extended while the horizontal dimension is reduced, allows the hose to bend with smaller inner radii without creating the conditions that lead to wrinkle formation, thus enabling compact arrangement while preserving durability.
2Reliability
If the circumferential length of the bent portion is increased to prevent wrinkles, then the durability is improved, but the thickness becomes non-uniform and strength varies
Solution Approach 1:
The patent applies local quality by modifying only the cross-sectional shape in the bent portion to a vertically long flat shape, while keeping straight portions as perfect circles. This localized modification increases the circumferential length specifically where needed to prevent wrinkles, improving durability without affecting the uniformity of thickness in other portions of the hose.
3Object-generated harmful factors
If the cross section of the bent portion is formed in a horizontally long flat shape to increase circumferential length, then wrinkles are prevented to some extent, but the inner radius cannot be sufficiently reduced and the shape does not meet compact arrangement requirements
Solution Approach 1:
The patent introduces asymmetry by changing the cross-sectional shape from a uniform circle to a vertically long flat shape in the bent portion. This asymmetric configuration, where the vertical dimension is extended while the horizontal dimension is reduced, allows the hose to bend with smaller inner radii without creating the conditions that lead to wrinkle formation, thus enabling compact arrangement while preserving durability.
Solution Approach 2:
The patent solves the problem by changing the orientation of the flat shape from horizontal to vertical. Instead of extending the flat shape in the horizontal direction (which increases arrangement space), the patent extends it in the vertical direction, allowing the bent portion to fit within a smaller horizontal envelope while still providing sufficient circumferential length to prevent wrinkles.
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 design minimizes the creation of poor appearance parts, maintains uniform thickness for consistent strength, and allows for a smaller inner radius, enabling compact arrangement and improved durability without compromising the hose's functionality.
Implementation Method 1
an unvulcanized hose is put on a mandrel having a bent portion in an intermediate part in a longitudinal direction and vulcanized so as to be molded in a bent pipe shape similar to a shape of the mandrel
Data Source
AI summary
In a hose having a bent portion, a poor appearance part is prevented from being created in an inner round portion of the bent portion. A bent pipe has a bent portion located in an intermediate part in a longitudinal direction in which a cross section in a radial direction of a round of the bent portion is formed in a flat shape, and non-bent portions being continuous with the bent portion. The flat shape of the bent portion is a vertically long flat shape. With this configuration, when an unvulcanized hose is put on a mandrel and vulcanized, an inner round portion of the unvulcanized hose comes into tight contact with a bent portion of the mandrel and is not separated from the bent portion, so that the poor appearance part is hardly created in an inner round portion of the bent portion.