Multilayer Refrigeration Pipe Assembly for Burst Pressure and Heat Resistance
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Solution Overview
Problem
Current multilayer composite pipes face challenges in achieving high burst pressure and temperature resistance, particularly in refrigeration applications, due to limitations in material thickness and reinforcement, which can lead to reduced strength and increased risk of single-point failures.
Innovation Solution
The development of a composite refrigeration line set featuring an inner polyethylene tube, adhesive layers, an AL 3555-O aluminum layer with specific thickness ranges, and an outer polyethylene layer, optionally including a low-emissivity layer and reinforcement, to enhance burst pressure and temperature resistance, and integration into a refrigeration system with a compressor and evaporator coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If material thickness is increased to achieve high burst pressure, then burst pressure resistance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs a composite structure consisting of an inner plastic layer, an intermediate aluminum layer, and an outer plastic layer. Each layer serves a specific function: the plastic layers provide flexibility and corrosion resistance, while the aluminum layer provides high strength and burst pressure resistance. This composite approach achieves high strength without requiring excessive thickness of any single material, thereby managing device complexity.
Solution Approach 2:
The pipe is divided into multiple functional layers with distinct properties. The inner plastic layer handles fluid contact and flexibility, the aluminum intermediate layer provides structural strength, and the outer plastic layer provides protection and additional flexibility. This segmentation allows each layer to be optimized for its specific function, achieving high burst pressure resistance without overall excessive complexity.
2Strength
If reinforcement is increased to achieve high burst pressure, then strength is improved, but manufacturing precision requirements increase
Solution Approach 1:
The use of composite materials with inherent bonding interfaces (plastic-aluminum-plastic) creates natural bonding zones that distribute stress across multiple interfaces. This reduces the precision requirements for any single bonding operation compared to a monolithic reinforced structure, as the multiple layers work together to achieve the overall strength.
Solution Approach 2:
The aluminum layer is positioned specifically at the intermediate position where it provides maximum structural support while being bonded to plastic layers that handle flexibility. This local optimization of material placement achieves high strength without requiring uniform high precision throughout the entire manufacturing process.
3Temperature
If aluminum layer thickness is increased to improve temperature resistance, then temperature resistance is improved, but material cost and weight increase
Solution Approach 1:
The composite structure combines aluminum's high temperature resistance with plastic's flexibility and thermal insulation properties. The plastic layers provide thermal insulation that reduces the heat transfer burden on the aluminum layer, allowing a thinner aluminum layer to achieve the same temperature resistance as a thicker aluminum layer would provide alone, thereby reducing material quantity.
Solution Approach 2:
The aluminum layer is strategically positioned at the intermediate position where it provides maximum thermal barrier effectiveness. The outer plastic layer provides additional thermal insulation, creating a layered thermal protection system that achieves high temperature resistance with optimized aluminum usage.
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 composite refrigeration line set achieves burst pressures exceeding 1950 pounds per square inch and improved resistance to temperature extremes, reducing the risk of failures and enhancing performance in refrigeration systems.
Implementation Method 1
a first adhesive layer positioned about the inner plastic tube; an aluminum layer positioned about the first adhesive layer and coupled to the inner plastic tube via the first adhesive layer; a second adhesive layer positioned about the aluminum layer; and an outer plastic layer positioned about the aluminum layer coupled to the aluminum layer via the second adhesive layer
Implementation Method 2
The composite refrigeration line set can further include a low-emissivity layer positioned about the outer plastic layer. The low-emissivity layer can include low-emissivity aluminum.
Data Source
AI summary
One aspect of the invention provides a composite refrigeration line set including at least one selected from the group consisting of: a suction line and a return line, characterized in that one or more of the suction line and the return line are a composite refrigeration line set tube include: an inner plastic tube; a first adhesive layer positioned about the inner plastic tube; an aluminum layer positioned about the first adhesive layer and coupled to the inner plastic tube via the first adhesive layer; a second adhesive layer positioned about the aluminum layer; and an outer plastic layer positioned about the aluminum layer coupled to the aluminum layer via the second adhesive layer. The inner plastic tube is polyethylene of raised temperature. The outer plastic tube is polyethylene of raised temperature. The aluminum layer comprises AL 3555-O.