Cyclone Dustbin Full Detection Using Bottom Optical Sensing
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Solution Overview
Problem
Vacuum cleaners with cyclonic dust separation chambers often fail to indicate when the dustbin is full, leading to clogged filters and maintenance issues due to user forgetfulness, as existing optical dust indicators are prone to dust contamination and false readings.
Innovation Solution
A dust detection system using an electromagnetic signal emitter and receiver positioned at the bottom of the cyclonic dust separation chamber, which remains free from dust due to the cyclonic airflow, providing a reliable indication of dustbin fullness by detecting accumulated dust blocking the signal, with features like a protruding element for enhanced airflow and shielding to reduce noise and reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical dust indicators are arranged in the dust separation chamber to detect dust levels, then the dustbin fullness can be indicated, but the optical sensors become contaminated by dust accumulation leading to false readings
Solution Approach 1:
The patent introduces the cyclonic airflow as an intermediary element that actively protects the optical sensors from dust contamination. The strong downward airflow generated by the cyclone effect creates a clean zone around the sensors, preventing dust particles from reaching and contaminating them, thus maintaining both detection accuracy and sensor reliability
Solution Approach 2:
The patent positions the optical sensors at the bottom of the dust separation chamber where the cyclonic airflow creates a region of relatively uniform low-dust concentration. This positioning exploits the equipotential-like distribution of dust particles in the cyclone field, where the strong downward flow maintains a consistent clean environment around the sensors
2Productivity
If the dustbin is not emptied before the critical level is reached, then the vacuum cleaner continues to operate, but filters and other parts become clogged requiring maintenance
Solution Approach 1:
The patent implements preliminary action by providing early warning indication of dustbin fullness before the critical level is reached. The optical detection system triggers an indicator signal when dust approaches the critical level, prompting users to empty the dustbin proactively before clogging occurs, thus maintaining continuous operation capability while preventing maintenance issues
Solution Approach 2:
The patent establishes a feedback mechanism where the optical sensors continuously monitor dust levels and provide real-time information to the user through indication signals. This closed-loop feedback system enables users to respond appropriately by emptying the dustbin at the optimal time, balancing continuous operation with preventive maintenance
3Measurement precision
If optical sensors are positioned to detect dust in the dust separation chamber, then dustbin fullness can be detected, but dust contamination of the sensors increases
Solution Approach 1:
The cyclonic airflow serves as a protective intermediary between the dust-laden environment and the optical sensors. The strong downward flow created by the cyclone effect acts as a barrier that prevents dust particles from reaching the sensors, allowing the sensors to maintain measurement precision without suffering from dust contamination
Solution Approach 2:
The patent extracts the optical sensors from the high-dust concentration zones within the dust separation chamber and positions them in the clean zone at the bottom where the cyclonic airflow protects them. This spatial extraction separates the sensing function from the dust-laden environment while maintaining detection capability
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
Effectively indicates when the dustbin is full, reducing filter clogging and maintenance needs by minimizing dust contamination and false alerts, ensuring efficient operation and user notification.
Implementation Method 1
The dust separation chamber is adapted to provide a generally cyclonic airflow for separating dust from the dust laden air stream
Implementation Method 2
an emitter positioned to emit an electromagnetic signal into the dust separation chamber during operation of the vacuum cleaner, and a receiver positioned to receive the electromagnetic signal
Data Source
AI summary
There is provided a dust detection system for a vacuum cleaner comprising a dust separation chamber (20) of cyclone type and having a separate dustbin (30) for collecting separated dust. The dust separation chamber is adapted to provide a generally cyclonic airflow for separating dust from a dust laden air stream, and is at a bottom (25) of the dust separation chamber connected via an outlet (22) to the dustbin. The dust detection system further comprises an emitter (41) positioned to emit an electromagnetic signal into the dust separation chamber during operation of the vacuum cleaner, and a receiver (42) positioned to receive the electromagnetic signal. The inventive concept is based on an understanding that when the dustbin becomes full, dust accumulates at the bottom of the dust separation chamber, i.e. stays rotating at the bottom, since it cannot enter the dustbin. The emitter and receiver are positioned in a bottom portion (26) of the dust separation chamber and are arranged to detect dust accumulating at the bottom portion during operation of the vacuum cleaner, thereby providing an indication of the dustbin being full.