Multi-Layer Gasket Sealing Vehicle Roof Opening
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Solution Overview
Problem
Conventional transport refrigeration units located on vehicle roofs are unsightly and allow air and water to enter the vehicle when moved inside, necessitating a sealing solution for openings to maintain cooling while preventing contamination.
Innovation Solution
A gasket with multiple layers, including an aluminum layer secured by a butyl adhesive, is used to seal the opening between the refrigeration unit and the vehicle roof, preventing water, air, and contaminants from entering while allowing external air for cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the refrigeration unit is located within the vehicle compartment, then the refrigeration unit is hidden from external view, but air and water can enter the vehicle through the opening
Solution Approach 1:
A multi-layer gasket system comprising an aluminum layer, butyl layer, and polysulfone layer is used to seal the opening in the vehicle roof. The flexible gasket material conforms to the opening geometry while providing effective sealing against water and air ingress, allowing the refrigeration unit to be positioned inside the vehicle compartment for aesthetic purposes without compromising weatherproofing.
2Shape
If the refrigeration unit is located within the vehicle compartment, then the refrigeration unit is hidden from external view, but the opening must be provided to allow external air for cooling
Solution Approach 1:
The gasket is constructed as a composite material system with three distinct layers: an aluminum layer for structural integrity and initial sealing, a butyl layer for adhesive bonding and flexibility, and a polysulfone layer for enhanced chemical resistance and sealing performance. This composite structure maintains reliable sealing while accommodating the opening required for refrigeration unit access and cooling airflow.
3Object-affected harmful factors
If a gasket is used to seal the opening, then water and air ingress is prevented, but the refrigeration unit components must still access external air for cooling
Solution Approach 1:
The multi-layer gasket acts as an intermediary element that selectively manages airflow and water ingress. The aluminum layer provides a rigid barrier while the butyl and polysulfone layers create flexible sealing paths that can accommodate thermal expansion and contraction. This intermediary sealing system prevents water and unwanted air ingress while maintaining controlled access for cooling airflow to reach the refrigeration unit components.
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 gasket effectively seals the opening, hiding the refrigeration unit from view, maintaining a cool vehicle compartment by preventing leakage and corrosion, and ensuring efficient heat removal without affecting interior temperatures.
Implementation Method 1
A butyl layer is located adjacent to the vehicle roof. The butyl layer acts as an adhesive to attach the aluminum to the vehicle roof.
Implementation Method 2
Insulation is placed between the external layer and the internal layer to insulate the vehicle compartment from external air.
Implementation Method 3
A gasket is located between the refrigeration unit and the vehicle roof to seal the opening. The aluminum layer prevents ingress of water, air, and other contaminants into the vehicle roof through the opening.
Data Source
AI summary
A refrigeration unit includes an external housing located primarily outside of a vehicle compartment of a vehicle, and an internal housing located primarily inside of the vehicle compartment. A vehicle roof of the compartment has an external layer and an internal layer spaced apart from the external layer with insulation located there between. The vehicle roof includes an opening that receives the refrigeration unit. A gasket provides a seal between the refrigeration unit and the vehicle roof. The gasket covers the exterior layer and the interior layer. The gasket is formed of multiple layers of material which are secured to one another.