High-Pressure Tank Liner With Intermediary Resin Buffer
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Solution Overview
Problem
High-pressure tanks with fiber reinforced resin liners are prone to damage due to thermal expansion and contraction during gas charging and discharging, as the resin liner expands and contracts more easily than the reinforcement layer, potentially leading to damage and instability.
Innovation Solution
A high-pressure tank design featuring a two-layer resin structure, where a softer second resin layer with a lower elastic modulus is interposed between the first resin layer and the reinforcement layer, acting as a buffer to absorb thermal stress and prevent damage to the liner during expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a fiber reinforced resin reinforcement layer covers the liner, then the tank strength and pressure resistance are improved, but the liner is restrained from expanding and contracting during thermal changes, leading to potential damage
Solution Approach 1:
A second resin layer with lower elastic modulus is introduced as an intermediary between the first resin layer and the reinforcement layer. This intermediate layer acts as a buffer that absorbs thermal stress during expansion and contraction, preventing direct stress transmission to the liner while maintaining the restraining function of the reinforcement layer.
Solution Approach 2:
The elastic modulus parameter of the resin layer is varied by creating a two-layer structure: the first resin layer has a higher elastic modulus for structural support, while the second resin layer has a lower elastic modulus for stress buffering. This parameter differentiation allows simultaneous achievement of strength and damage resistance.
2Ease of manufacture
If the liner is made of resin material, then the manufacturing ease and weight are improved, but the liner expands and contracts more easily than the reinforcement layer during thermal changes, causing stress concentration
Solution Approach 1:
The thermal expansion stability is improved by changing the elastic modulus parameter of the resin layer. The second resin layer with lower elastic modulus is specifically designed to accommodate thermal expansion and contraction, reducing stress concentration while maintaining the manufacturing advantages of resin materials.
3Stress or pressure
If the reinforcement layer restrains the liner during gas charging and discharging, then the pressure control is improved, but the thermal stress from adiabatic expansion and contraction damages the liner
Solution Approach 1:
The second resin layer serves as a mediator that decouples the pressure control function from the thermal stress transmission. It allows the reinforcement layer to maintain pressure control while preventing thermal stress from reaching the liner, thereby protecting liner integrity during gas charging and discharging operations.
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
The second resin layer effectively buffers thermal stress, stabilizing the gas storage and preventing damage to the liner, ensuring reliable gas containment and enhanced durability of the tank.
Implementation Method 1
the resin liner expands and contracts more easily than the reinforcement layer, potentially leading to damage and instability
Implementation Method 2
When the gas in the tank is adiabatically expanded and compressed due to charging or discharging of the gas during the use of the high-pressure tank, the liner restrained by the reinforcement layer expands and contracts due to thermal change
Data Source
AI summary
A high-pressure tank includes: a liner including a body portion having a tubular shape and side end portions each having a dome shape, the side end portions being provided on opposite sides of the body portion; and a reinforcement layer made of fiber reinforced resin covering an outer surface of the liner. The reinforcement layer includes a tubular member covering the body portion and dome members joined to opposite sides of the tubular member so as to cover the side end portions. The liner includes a first resin layer defining a storage space for storing gas and a second resin layer provided between the first resin layer and at least the tubular member. An elastic modulus of a second resin constituting the second resin layer is lower than an elastic modulus of a first resin constituting the first resin layer.