Filtering devices for evacuation stations

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Solution Overview

Problem

Autonomous cleaning robots face issues with debris accumulation in evacuation stations, leading to clogs and obstructions that reduce the efficiency of debris evacuation and require frequent filter replacements, resulting in unnecessary cleanup efforts and potential false positive detections of full filters.

Innovation Solution

A filtering device with a conduit designed to inhibit debris accumulation at the interface with the evacuation station, allowing for easy removal and replacement without debris spillage, and an evacuation station that can detect clogs and air pressure changes to autonomously manage airflow and filter capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a conventional conduit design is used, then debris can be evacuated from the cleaning robot, but debris accumulates at the interface between the filtering device conduit and the evacuation station conduit, causing clogs and obstructions

Engineering Contradiction:

Improvedebris evacuation efficiencyVSAvoidclog formation

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The conduit is designed with a curved geometry instead of straight sections, creating smooth transitions that prevent debris accumulation. The curved shape eliminates dead zones where debris could settle, maintaining reliable airflow and preventing clogs while preserving evacuation efficiency.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Ease of operation

If the filtering device is designed for easy removal, then users can quickly replace filters, but debris may be dislodged into the environment during removal

Engineering Contradiction:

Improvefilter replacement easeVSAvoiddebris spillage

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The conduit design prevents debris from accumulating in the first place by eliminating accumulation zones through curved geometry. Since debris never accumulates at the interface or near the opening, there is no debris to dislodge during filter removal, thus preventing harmful spillage while maintaining ease of operation.

Inventive Principle:

Principle #9Preliminary anti-action

3Extent of automation

If the evacuation station uses air pressure detection to determine filter fullness, then automation is improved, but false positive detections occur due to obstructions in the conduit

Engineering Contradiction:

Improveautomatic filter fullness detectionVSAvoiddetection accuracy

Core Design Contradiction:

Extent of automationVSMeasurement precision

Solution Approach 1:

The curved conduit design eliminates obstruction points that would cause false pressure readings. By preventing debris accumulation and clog formation, the air pressure detection system receives accurate signals about actual filter fullness, improving measurement precision while maintaining automation.

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Reliability

If frequent filter replacements are performed, then clogs are prevented, but productivity is reduced due to unnecessary replacements and cleanup efforts

Engineering Contradiction:

Improveclog preventionVSAvoidevacuation operations per filter

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The curved conduit design inherently prevents clog formation by eliminating debris accumulation zones. This maintains reliable airflow throughout the filter's service life, allowing filters to operate at full capacity without premature replacement, thus increasing productivity while maintaining reliability.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 enhances the efficiency of autonomous cleaning robots by reducing clog formation, increasing the number of evacuations before filter replacement, and minimizing cleanup efforts, while accurately detecting filter fullness and airflow obstructions.

Implementation Method 1

an air mover configured to generate airflow to move debris from the cleaning robot into the receptacle through the filtering device

Methodology Applied

Scientific EffectAirflow:

Implementation Method 2

The size, shape, dimensions, and other geometric attributes of the conduit of the filtering device can reduce the likelihood that the debris accumulates within the conduit

Methodology Applied

Scientific EffectFluid flow dynamics:

Implementation Method 3

The evacuation station can also autonomously remove a detected clog or other obstruction by operating an air mover of the evacuation station to remove the clog

Methodology Applied

Scientific EffectAirflow:

Data Source

PatentEP4205619B1Filtering devices for evacuation stations

Publication Date: 2024.11.27 IROBOT CORP

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AI summary

A bag-based filtering device for collecting debris from a cleaning robot via a debris evacuation station includes a filter bag configured to separate at least the portion of the evacuated debris from a flow of air generated by the evacuation station. The filtering device includes a conduit extending inward from an opening of the filter bag into the receptacle. The conduit is configured to pneumatically connect a receptacle of the filtering device with an inlet of the filtering device to direct the flow of air generated by the evacuation station through the filter bag to separate at least the portion of the evacuated debris from the flow of air.