Pliable Air Duct Framework to Prevent Sagging and Inflation Noise
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Solution Overview
Problem
Metal air ducts in warehouse and manufacturing environments face issues such as condensation leading to mold and bacteria growth, uncomfortable drafts, and unsightly sagging when deflated, along with noise from sudden inflation.
Innovation Solution
The implementation of pliable-wall air ducts with internal expanding frameworks that maintain duct tautness using a central shaft and radial spokes, preventing buckling and sagging, and minimizing pneumatic shock through tensioning and compression mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal ducts are used, then structural strength and rigidity are improved, but condensation formation and mold growth occur due to thermal conductivity
Solution Approach 1:
The patent replaces rigid metal ducts with flexible fabric ducts that have low thermal conductivity. The fabric material acts as a thermal insulator, preventing condensation formation on the duct exterior while maintaining structural integrity through the flexible shell design. This resolves the contradiction by eliminating the harmful thermal conductivity of metal while preserving structural strength through the fabric construction.
2Object-affected harmful factors
If fabric ducts are used, then condensation and mold growth are prevented, but the duct sags and creates poor appearance when deflated
Solution Approach 1:
The patent divides the fabric duct into multiple segmented sections with rigid or semi-rigid connectors between them. This segmentation allows each section to maintain its shape independently when deflated, preventing the overall sagging appearance while preserving the condensation prevention benefits of the fabric material. The connectors provide structural support without requiring the entire duct to remain pressurized.
Solution Approach 2:
The patent incorporates dynamic support mechanisms such as collapsible rigid frames or telescopic support rods that can extend and retract based on pressure conditions. When pressurized, the duct maintains its cylindrical shape; when deflated, the dynamic supports prevent collapse and sagging, maintaining acceptable appearance while preserving the fabric's condensation prevention properties.
3Ease of operation
If fabric ducts are used, then air distribution is improved through porous walls, but loud popping sounds occur during inflation
Solution Approach 1:
The patent incorporates damping elements, shock-absorbing materials, or gradual inflation mechanisms that cushion the inflation process before the fabric becomes fully taut. This beforehand cushioning reduces the sudden tension release that causes popping sounds while maintaining the beneficial air distribution through porous fabric walls. The cushioning elements are positioned to absorb the shock of inflation without interfering with normal operation.
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
This solution prevents condensation, maintains a consistent appearance, reduces drafts, and eliminates noise from inflation, ensuring a more hygienic and aesthetically pleasing air distribution system.
Implementation Method 1
a pliable fabric wall (often porous) that inflates to a generally cylindrical shape by the pressure of the air being conveyed by the duct
Implementation Method 2
the fabric having a lower thermal conductivity than that of metal ducts
Data Source
AI summary
Pliable-wall air ducts with internal expanding structures are disclosed. An example air duct system includes a shaft to be disposed within an air duct, to extend in a longitudinal direction, and to be in longitudinal compression. The air duct system also includes a plurality of ribs to be coupled to the shaft and to engage an inner surface of the air duct and a spring to be disposed within the air duct, the spring to be coupled to the shaft. The spring under stress being a contributing factor in both the shaft being in longitudinal compression and the air duct being in longitudinal tension.