Removable HVAC Jacket Plug with Interference Fit to Reduce Air Leakage
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Solution Overview
Problem
HVAC systems face air leakage issues due to non-replaceable knockout features in their jackets, which are designed for component connections but become unnecessary, leading to inefficiencies and combustion performance problems when connections change.
Innovation Solution
A removable plug with a main body, plug lip, and radially outer surface features, including dimples or fasteners, that create an interference fit with the jacket opening, providing a leak-resistant and adjustable solution for various HVAC system configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If knockout features are provided in the jacket for component connections, then access is provided for piping and electrical connections, but air leakage occurs when connections are no longer needed
Solution Approach 1:
The patent applies this principle by providing removable plugs that can be easily installed and removed from jacket openings. These plugs are simple, inexpensive components that allow temporary access for connections and can be removed when no longer needed, preventing air leakage without requiring permanent structural modifications to the jacket
Solution Approach 2:
The patent segments the jacket opening closure function into separate removable plug components rather than requiring the entire jacket structure to be modified. The plugs are independent, replaceable elements that can be individually installed or removed from specific jacket openings, allowing selective access while maintaining overall jacket integrity
2Ease of operation
If knockout features are formed as removable segments in the jacket, then access is provided for connections, but the segments are not replaceable once removed
Solution Approach 1:
The patent transforms the static, permanent knockout feature into a dynamic, reversible system. The plugs are designed to be easily inserted and removed from jacket openings, allowing the system to adapt to changing connection requirements. This dynamic capability enables multiple installation and removal cycles without compromising the integrity or functionality of either the plug or the jacket opening
3Loss of energy
If plugs are installed in jacket openings to seal unused openings, then air leakage is reduced, but installation and removal should be easy
Solution Approach 1:
The plug design incorporates self-retaining features such as interference fits, expansion mechanisms, or sealing lips that automatically engage with the jacket opening upon insertion. This self-service capability allows the plug to secure itself without requiring additional fasteners, tools, or complex installation procedures, while still providing effective sealing to prevent air leakage
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 solution effectively seals unused openings in HVAC systems, reducing air leakage, maintaining efficiency, and allowing for easy installation and removal of components without compromising heat resistance or durability.
Implementation Method 1
The one or more plug retention features define an interference fit with a jacket opening of the HVAC system when the plug is installed to the jacket opening
Data Source
AI summary
A removable plug for a heating ventilation and air conditioning (HVAC) system includes a main body extending from a plug central axis, and a plug lip defining an outer perimeter of the plug. A radially outer surface is located between the main body and the plug lip. One or more plug retention features extend radially outwardly from the radially outer surface. The one or more plug retention features define an interference fit with a jacket opening of the HVAC system when the plug is installed to the jacket opening.