Composite Hose Strap Structure for Uniform Pitch and Restoring Force
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Solution Overview
Problem
Conventional composite hoses used for transporting liquefied natural gas and liquefied petroleum gas suffer from damage due to uneven pitches in the inner spiral race, leading to increased friction, potential leaks, and risk of explosion, as well as damage from repeated bending and stretching.
Innovation Solution
A composite hose design featuring a spirally wound inner wire with a coating layer and a strap between adjacent inner wires to support the coating layer, preventing longitudinal extension and maintaining uniform pitch, thereby enhancing durability and restoring force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the inner spiral race is used to maintain uniform pitch, then the hose structure is stabilized, but friction increases and pitches may still vary under continuous fluid flow
Solution Approach 1:
The patent extracts the inner spiral race from the hose structure and replaces it with a spiral wire coating applied directly to the inner surface of the inner layer. This eliminates the separate spiral race component that caused friction and pitch variation, while maintaining the desired pitch uniformity through the coating application process.
Solution Approach 2:
The patent introduces a coating layer as an intermediary between the fluid flow and the inner layer structure. This coating layer with spiral wire pattern provides the necessary pitch uniformity and structural stability without creating the friction problems associated with the traditional inner spiral race.
2Strength
If the hose is made rigid to withstand high pressure, then pressure resistance is improved, but flexibility and ease of winding are reduced
Solution Approach 1:
The patent applies different properties to different parts of the hose structure. The inner layer with spiral wire coating provides rigidity and pressure resistance where needed, while the outer layer and reinforcement structure provide flexibility and bendability. This local differentiation allows the hose to withstand high pressure while remaining easy to wind and handle.
Solution Approach 2:
The patent uses a composite structure combining multiple materials and layers: an inner layer with spiral wire coating for pressure resistance, an outer layer for flexibility, and reinforcement layers for additional strength. This composite construction enables the hose to simultaneously achieve rigidity for high pressure and flexibility for easy winding.
3Adaptability or versatility
If repeated bending and stretching occur, then the hose becomes more adaptable to handling, but the inner spiral race pitches widen and damage occurs
Solution Approach 1:
The patent applies the spiral wire coating to the inner layer before the hose undergoes any bending or stretching operations. This preliminary application ensures that the pitch uniformity is established in advance, and the coating structure is designed to accommodate subsequent handling operations without pitch widening or damage.
Solution Approach 2:
The patent changes the physical and chemical parameters of the inner layer by applying a spiral wire coating that modifies the structural properties. This coating creates a more resilient structure that can undergo repeated bending and stretching while maintaining pitch uniformity and preventing the widening that occurs with traditional spiral races.
4Strength
If the coating layer is made thicker to improve durability, then protection is enhanced, but longitudinal extension increases and inner wire separation occurs
Solution Approach 1:
The patent applies the coating layer with spiral wire pattern in a controlled manner, providing adequate thickness for durability and protection while maintaining proper adhesion to the inner layer. The spiral wire coating is applied locally with specific properties that prevent excessive longitudinal extension and inner wire separation, achieving the right balance between durability and dimensional stability.
Data Source
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AI summary
The present invention discloses a composite hose having improved durability and restoring force. The composite hose according to the present invention has a coating layer formed in a form of encompassing a spirally wound inner wire, and has a strap provided in a region of the coating layer between the inner wires adjacent to each other. In addition, the strap supports the coating layer toward the center of the coating layer. Therefore, since the coating layer is prevented from being longitudinally extended, the surface of the inner wire facing the center of the coating layer is prevented from being located on the same line as the inner surface of the coating layer, thereby preventing the inner wire from being separated from the coating layer such that the durability of the composite hose can be improved. In addition, as a result of a tensile strength test, the composite hose according to the present embodiment shows greater elastic force than a conventional composite hose, thereby having excellent restorability.