Vacuum Cleaner Filter Cleaning Using Flow Resistance Measurement
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Solution Overview
Problem
Existing filter cleaning methods for vacuum cleaners often initiate cleaning based solely on pressure drop, which can be influenced by factors unrelated to filter clogging, leading to unnecessary cleanings and potential misidentification of blockages.
Innovation Solution
A method that measures both pressure drop and volume flow at the filter, using a characteristic curve to determine flow resistance, allowing for targeted and necessary filter cleaning operations, and includes threshold testing to assess filter condition and potential need for replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter cleaning is initiated based solely on pressure drop, then filter cleaning frequency increases, but unnecessary cleanings occur and blockages may be misidentified
Solution Approach 1:
The system uses feedback from multiple sensors (pressure sensors and flow sensors) to continuously monitor filter condition and dynamically adjust cleaning initiation decisions. The control unit processes feedback signals from both pressure differential and flow rate measurements to accurately determine when cleaning is actually needed, preventing false positives and unnecessary cleanings.
Solution Approach 2:
The patent introduces flow rate measurement as an intermediary parameter that mediates between pressure drop and cleaning decision. By using flow rate as an intermediate indicator of filter clogging, the system can distinguish between pressure changes caused by actual filter contamination versus those caused by other factors like motor performance variations or atmospheric pressure changes.
2Difficulty of detecting and measuring
If pressure sensors are used to monitor filter condition, then filter clogging detection is enabled, but blockages in flow paths cannot be distinguished from filter clogging
Solution Approach 1:
The monitoring system is segmented into multiple independent measurement functions: pressure differential measurement for filter load assessment, flow rate measurement for clogging detection, and control logic that processes each measurement separately. This segmentation allows the system to identify whether pressure changes are due to filter clogging or flow path blockages by comparing results from different measurement segments.
Solution Approach 2:
The patent adds a new measurement dimension (flow rate) to the existing pressure-based monitoring system. By measuring flow rate in addition to pressure differential, the system creates a two-dimensional diagnostic space that enables distinction between filter clogging (affects pressure) and flow path blockages (affects flow rate), resolving the ambiguity of single-parameter monitoring.
3Reliability
If filter cleaning is performed frequently, then filter performance is maintained, but energy consumption increases and operational efficiency decreases
Solution Approach 1:
The cleaning system transitions from static, time-based or pressure-threshold-based cleaning schedules to a dynamic, condition-based cleaning strategy. The control unit continuously adjusts cleaning timing based on real-time measurements of pressure differential and flow rate, performing cleaning only when actual filter clogging reaches levels that impact performance, thereby optimizing energy consumption while maintaining filter effectiveness.
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
Ensures filter cleaning occurs only when necessary, differentiating between filter clogging and other flow path issues, and provides a means to assess filter recovery and potential replacement needs, thereby optimizing cleaning efficiency and reducing unnecessary interventions.
Implementation Method 1
a first pressure sensor which determines a first pressure in an inflow section of the filter device, a second pressure sensor which determines a second pressure in an outflow section of the filter device
Implementation Method 2
determining a pressure drop at the filter as a pressure difference between the first pressure and the second pressure
Data Source
AI summary
The invention relates to a method for cleaning a filter of a vacuum cleaning apparatus, wherein in operation of the vacuum cleaning apparatus the filter has suction air flowing therethrough, said suction air being generated by a fan, the method including measuring a first pressure at an inflow section of the filter, measuring a second pressure at an outflow section of the filter, determining a pressure drop at the filter as a pressure difference between the first pressure and the second pressure, determining a quantity characterizing a volume flow of the suction air in the outflow section of the filter, determining, from the pressure difference and the quantity that characterizes the volume flow, a quantity characterizing a flow resistance of the filter, and initiating a filter cleaning operation in dependence upon the determined quantity that characterizes the flow resistance of the filter.