Reinforced Flapper Valve Hinge for Wear-Resistant Fuel Control
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Solution Overview
Problem
Traditional flapper valves in aerospace applications are prone to wear failure at the hinge due to repeated deformation, and metal hinges are not suitable due to static discharge concerns, leading to instability in fuel management within aircraft.
Innovation Solution
A flapper valve design featuring a rigid flap mounted within a flexible body with a permeated reinforcement structure, eliminating the need for metal components and reducing wear by using materials like fiberglass, plastic, or woven fabrics, which inhibit static discharge and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional metal hinge is used in the flapper valve, then the valve can be structurally strong, but it causes static discharge concerns and wear failure
Solution Approach 1:
The patent replaces the traditional metal mechanical hinge with a flexible body made of elastomeric material that provides the hinge function through material flexibility rather than mechanical joints. This eliminates metal-to-metal contact and static discharge risks while maintaining the necessary structural strength and rotational movement capability of the flapper valve.
Solution Approach 2:
The patent employs composite construction by embedding reinforcement materials (such as fabric or mesh layers) within the elastomeric flexible body. This composite structure provides the necessary strength and durability while maintaining the non-metallic, static-resistant properties of the elastomeric material, resolving the contradiction between strength and wear resistance.
2Strength
If a rigid hinge structure is used, then the valve maintains structural integrity, but it experiences wear failure due to repeated deformation
Solution Approach 1:
The patent transitions from a static rigid hinge to a dynamic flexible body that can deform and return to its original shape. The elastomeric material absorbs repeated deformation through elastic recovery, significantly extending the service life of the valve while maintaining structural integrity during operation.
Solution Approach 2:
The patent uses a flexible elastomeric body instead of a rigid hinge structure. This flexible shell provides the necessary rotational movement for the flapper while resisting wear through the material's elastic properties, thereby extending the duration of action and service life of the moving component.
3Strength
If metal components are used in the flapper valve, then the valve can be mechanically durable, but it cannot inhibit static discharge
Solution Approach 1:
The patent replaces all metal components with non-metallic elastomeric materials that inherently resist static discharge. The flexible body and flapper are constructed from elastomeric compounds that do not generate or conduct static electricity, eliminating the harmful static discharge effect while maintaining mechanical durability through the material's inherent properties and composite reinforcement.
Data Source
AI summary
A flapper valve comprising a generally rigid flap which is mounted within a flexible body coating. The hinge in the flexible body is formed by using an internal reinforcement material having a permeated structure which allows for the body material to penetrate through the reinforcement material during the valve formation. This provides for a more sturdy hinge which better resists wear.