Composite Spiral Vacuum Hose for Strength and Leak Resistance
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Solution Overview
Problem
Existing corrugated PE pipes used in vacuum hoses are prone to damage, particularly in winter, leading to water and air leakage, and replacing PE with stronger materials increases production costs and reduces flexibility.
Innovation Solution
A vacuum hose design comprising an inner tube body with a spiral structure and an outer tube body with a covering portion, where the inner and outer tube bodies are made of different materials, such as low-density polyethylene and high-density polyethylene, and are bonded at contact points to enhance strength and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PE pipe with corrugated design is used, then flexibility is improved, but strength and resistance to damage deteriorates
Solution Approach 1:
The vacuum hose employs a composite structure with an inner PE tube body and an outer protective tube body, combining the flexibility of PE with the strength and cold resistance of the outer material. This composite design resolves the contradiction by allowing each layer to contribute its advantageous properties.
Solution Approach 2:
The vacuum hose is divided into distinct functional segments: an inner tube body for flexibility and material resistance, and an outer tube body for strength and environmental protection. This segmentation allows optimization of each part for its specific function.
2Strength
If stronger materials replace PE plastic, then strength and leakage resistance are improved, but production cost increases and flexibility deteriorates
Solution Approach 1:
Instead of using expensive strong materials throughout, the invention uses a composite structure where only the outer protective layer is made of stronger material, while the inner tube remains PE. This reduces overall cost compared to full replacement while maintaining strength and leakage resistance.
Solution Approach 2:
The stronger material is applied locally only where needed for strength and protection (outer tube body), while the inner tube body maintains PE material properties. This localized application of different material qualities optimizes cost-effectiveness.
3Strength
If composite materials with different extrusion constants are used, then strength is improved, but material distribution uniformity deteriorates causing leakage
Solution Approach 1:
The composite materials are processed as separate segments (inner tube body and outer tube body) rather than mixing materials with different extrusion constants in a single extrusion process. This avoids the material distribution uniformity problem while maintaining the strength benefits of composite construction.
Data Source
AI summary
The vacuum hose includes an inner tube body and an outer tube body sleeved over the inner tube body. The inner tube body has a spiral structure defined by a first contact portion and a second contact portion. One end of the second contact portion is connected to one end of the first contact portion, and the other end of the second contact portion is in contact with the other end of the first contact portion. The outer tube body has a spiral structure defined by a covering portion. The covering portion contacts the first contact portion and the second contact portion and covers the end of the second contact portion in contact with the end of the first contact portion.