Flexible Duct Brush Retrieval for Full-Length Cleaning
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Solution Overview
Problem
Existing duct cleaning devices are often expensive, complex, and may damage smaller diameter ducts with thinner walls, failing to effectively clean the entire duct length from inlet to outlet without causing damage.
Innovation Solution
A duct cleaning apparatus using a flexible brush with an inverted parachute structure and a vacuum system, where the parachute is deployed using a rope and a safety retrieval line to ensure the brush can be inserted and retrieved through the duct, allowing for thorough cleaning without damaging the ducts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional shaft-connected brush devices are used to clean ducts, then cleaning capability is provided, but the devices are expensive and complex to manufacture
Solution Approach 1:
The brush is segmented into multiple independent bristle sections that can flex and conform to the duct interior, allowing effective cleaning without requiring a complex rigid shaft structure. This segmentation enables the brush to clean effectively while simplifying the overall device construction and reducing manufacturing costs.
Solution Approach 2:
A rope intermediary is used to deploy and retrieve the brush through the duct system, replacing the need for complex mechanical shaft extensions. The rope serves as a simple, cost-effective mediator that enables brush deployment throughout the entire duct length without requiring expensive articulated shaft mechanisms.
2Strength
If rigid or semi-rigid brush devices are used, then structural strength is maintained, but smaller diameter ducts with thinner walls may be damaged
Solution Approach 1:
The brush is constructed with flexible bristle sections that can bend and conform to the duct interior geometry, eliminating the rigid structures that cause damage to thin-walled ducts. The flexibility allows the brush to maintain contact with duct surfaces for effective cleaning while adapting to the duct's shape and thickness variations.
Solution Approach 2:
The brush transitions from a static rigid structure to a dynamic flexible configuration that can adapt its shape and stiffness based on the duct conditions. The flexible bristles dynamically conform to the duct interior, providing cleaning force only where needed while avoiding damage to vulnerable duct sections.
3Device complexity
If cleaning devices only clean part way through the duct, then device complexity is reduced, but the entire duct length is not cleaned
Solution Approach 1:
The brush design with rope deployment enables a single device to perform cleaning throughout the entire duct length, from inlet to outlet. The universal applicability of the rope-deployed flexible brush allows it to reach any duct configuration without requiring multiple specialized devices or complex extension mechanisms.
Solution Approach 2:
The rope is preliminarily threaded through the entire duct length before brush deployment, ensuring that the brush can be pulled through the complete duct pathway. This preliminary preparation enables full-length cleaning coverage without requiring complex real-time extension mechanisms during the cleaning 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
The solution provides a cost-effective, efficient, and safe method to clean the entire duct length from outlet to inlet, ensuring durability and reliability while being adaptable to various duct sizes and configurations.
Implementation Method 1
a vacuum system, where the parachute is deployed using a rope
Implementation Method 2
the parachute must have a deployed diameter sufficient to transit the duct with a rope attached
Data Source
AI summary
A duct cleaning apparatus and method for cleaning and maintaining the interior of most types of ducts, including chimneys, air conditioning and heating ducts, dryer ducts, vents, plumbing and rain gutter ducts. The apparatus is made up of a flexible rope (24) connected to a cleaning brush (10) or tool further connected to a retrieval parachute (30). The flexible rope (24) can be extended through the use of additional attached ropes (26) to create an infinitely long cleaning apparatus. The cleaning brush (10) may be configured in a variety of sizes with differing configurations of bristles (14) or appendages for specific applications. The cleaning appendages are connected to a rope (24) or line B, the length of which extends beyond the length of the duct (12) to be cleaned. One end of the rope (24) or line A is connected to the parachute (30) adapted with a wind-expanded periphery greater than that of the perimeter of the inside wall (22) of the duct (12) to be cleaned. A method is described for preparing the duct (12) for cleaning with the brush (10) by threading a rope or line A through the duct (12) using the parachute (30) and applying a vacuum from a machine (36).