Annular Packing with Segmented Protrusions for Rolling Prevention
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Solution Overview
Problem
Conventional packings used to prevent moisture entry in electric wires through partition walls often twist during assembly, compromising waterproof performance and requiring reassembly, and their design to prevent rolling is costly due to unnecessary material usage.
Innovation Solution
An annular packing design with first protruding portions that enlarge the diameter from the outer surface and second protruding portions that reduce the diameter from the inner surface, both arranged in parallel, along with axially-protruding portions that sandwich these features, preventing rolling without relying on a wide, material-intensive axially-protruding structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an axially-protruding portion is provided to prevent rolling during assembly, then the packing is prevented from rolling, but the use amount of materials increases and cost increases
Solution Approach 1:
The packing is divided into multiple functional segments: first protruding portions for water blocking, second protruding portions for rolling prevention, and axially-protruding portions for positioning. Each segment performs a specific function with minimal material, avoiding the need for a single large structure to handle all functions.
Solution Approach 2:
Different regions of the packing have different structural characteristics optimized for their specific functions. The first protruding portions are positioned to block water, the second protruding portions are positioned to prevent rolling, and the axially-protruding portions are positioned for assembly alignment. This localized optimization reduces overall material usage while maintaining effectiveness.
2Quantity of substance
If the packing structure is simplified to reduce material usage, then cost is reduced, but the ability to prevent rolling during assembly is compromised
Solution Approach 1:
The packing structure is segmented into distinct functional elements: first protruding portions for water blocking, second protruding portions for rolling prevention, and axially-protruding portions for positioning. This segmentation allows each element to be optimized for its specific function with minimal material, achieving both cost reduction and rolling prevention.
Solution Approach 2:
The packing structure integrates multiple functions into a single component: water blocking, rolling prevention, and assembly positioning. The second protruding portions serve dual purposes by both blocking water and preventing rolling, while the axially-protruding portions provide both structural support and alignment guidance, reducing the need for separate components.
3Ease of manufacture
If conventional packing design is used, then manufacturing is simple, but the packing twists during assembly requiring reassembly
Solution Approach 1:
The packing employs asymmetric structures: the first protruding portions are positioned differently from the second protruding portions, and the axially-protruding portions are positioned to sandwich between them. This asymmetric arrangement creates a unique fit that guides correct assembly orientation and prevents twisting during installation.
Solution Approach 2:
The second protruding portions are designed to preemptively counteract the rolling tendency during assembly by providing frictional resistance before rolling can occur. The axially-protruding portions are positioned to sandwich the first and second protruding portions, creating a pre-configured structure that resists twisting forces during the assembly process.
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 effectively prevents rolling during assembly without increasing material usage, reducing costs and allowing for easier attachment to the electric wire while maintaining waterproof performance.
Implementation Method 1
the waterproof mountain 511 receives a force in the lateral direction (for example, the rightward direction) of the drawing due to friction against an inner peripheral surface of the hole
Data Source
AI summary
An packing has an annular shape. The packing includes: a plurality of first protruding portions that protrude in a direction of enlarging a diameter from an outer peripheral surface of the annular shape to be continuous along a circumference and are arranged in parallel in an axial direction; a plurality of second protruding portions that protrude in a direction of reducing a diameter from an inner peripheral surface of the annular shape to be continuous along a circumference and are arranged in parallel in the axial direction with a parallel width wider than a parallel width with which the first protruding portions are arranged; and axially-protruding portions that are provided positions to sandwich the first protruding portion and the second protruding portion from both sides in the axial direction and protrude in the axial direction from both ends in the axial direction of the first protruding portion.