Quick-Change Restrictor Plate Assembly for Aircraft Duct Rebalancing
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Solution Overview
Problem
Existing air duct systems in lightweight aircraft require costly and weight-added connectors for airflow modification, and the use of bonding agents for restrictor plates introduces delays and impracticalities in manufacturing and maintenance, especially when late-stage changes are necessary.
Innovation Solution
A quick change restrictor plate adapter system with a two-piece design, featuring a nozzle and tee section with a locking mechanism, allowing for easy installation, inspection, and replacement of restrictor plates without disassembling the ducts, using a locking pin to secure the plates in place instead of bonding agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bonding agents are used to secure restrictor plates, then the restrictor plates are more secure and resistant to vibration, but the manufacturing process is delayed due to curing time and late-stage changes are costly
Solution Approach 1:
The patent replaces the chemical bonding system with a mechanical locking system. The restrictor plate includes a locking tab that engages with a slot in the duct connector, providing secure attachment without requiring bonding agents. This mechanical engagement provides immediate security without curing time delays.
Solution Approach 2:
The patent changes the attachment mechanism from chemical (bonding agent) to mechanical (locking tab and slot engagement). This parameter change allows the restrictor plate to be securely attached while maintaining the ability to be quickly removed and reinstalled for late-stage modifications without incurring additional costs.
2Stability of the object's composition
If conventional connectors are used to modify ducting, then the duct continuity is maintained, but the system weight increases and cost increases
Solution Approach 1:
The patent segments the duct modification system into a modular restrictor plate assembly that attaches to the existing duct connector without requiring permanent modification. The restrictor plate, locking tab, and slot form a self-contained module that maintains duct integrity while adding minimal weight.
Solution Approach 2:
The restrictor plate itself is a perforated component with multiple openings for airflow control. This porous structure allows the plate to perform its flow regulation function while maintaining a lightweight construction that does not significantly increase system weight.
3Reliability
If restrictor plates are adhered with bonding agents, then they are less susceptible to vibration and corrosion damage, but they cannot be easily changed or inspected
Solution Approach 1:
The patent replaces the chemical bonding system with a mechanical locking system. The locking tab engages with the slot to provide secure attachment that resists vibration and corrosion, while simultaneously allowing the restrictor plate to be easily removed and reinstalled by simply disengaging the locking tab.
Data Source
AI summary
A “quick change” restrictor assembly that allows quick rebalancing of flow-pressures within a duct system. The invention comprises a removable restrictor plate, a branch circuit for receiving the plate, and a means for retaining the restrictor plate to the branch circuit. The circuit includes a feature that allows for removal and installation of the restrictor plate without removing the branch circuit, inlet or outlet ducting. The quick change restrictor will not require bonding and can be installed easily from outside the duct without any disassembly. The restrictor may also have various clips or tabs to reinforce the slot the restrictor plate is inserted into. The restrictor may also have a smart part number and color code that is visible from outside the duct allowing easy removal, identification and inspection.