Vacuum Cleaner Dust Indicator With Self-Cleaning Optical Path
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Solution Overview
Problem
Bagless vacuum cleaners often suffer from clogging due to users forgetting to empty the dustbin before it reaches a critical level, leading to reduced cleaning performance and increased maintenance needs, as existing optical dust indicators are prone to contamination and require complex mechanical components.
Innovation Solution
A dust indicator system with a fixed design that uses an air channel to create a clean airflow path for an electromagnetic sensor, protected by a transparent window, which prevents dust from sticking and ensures reliable operation without moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical sensors are arranged in the dustbin to detect dust level, then dust level detection capability is improved, but the sensors become contaminated by dust particles blocking the optical path
Solution Approach 1:
A transparent window is introduced as an intermediary barrier between the optical sensor and the dust environment. The window allows electromagnetic signals to pass through while physically blocking dust particles from reaching and contaminating the sensor, thus resolving the contradiction between detection capability and sensor contamination
Solution Approach 2:
The sensor is extracted from the dusty environment by placing it behind a transparent window. This separates the sensing function from the contaminated zone, allowing the sensor to remain in a clean area while still detecting dust levels through the window material
2Reliability
If mechanical components are added to protect sensors from dust, then sensor protection is improved, but device complexity increases
Solution Approach 1:
The mechanical protection system is replaced with a static transparent window and an airflow-based cleaning system. Instead of using moving mechanical parts to protect or clean the sensor, the solution uses a fixed window barrier combined with dust-free airflow to continuously clear the optical path, significantly reducing device complexity while maintaining reliability
Solution Approach 2:
The system uses the vacuum cleaner's own operational airflow to clean the sensor area. The dust-free air flow that is already present during vacuum operation is directed through the transparent window to automatically clear any dust particles from the optical path, eliminating the need for separate mechanical cleaning mechanisms
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 system effectively indicates when the dustbin needs to be emptied, maintaining sensor functionality and reducing maintenance by keeping the sensor area clean and free from dust, thus enhancing the vacuum cleaner's performance and user convenience.
Implementation Method 1
The dust indicator is arranged in a wall of a dustbin of the vacuum cleaner that is set under negative pressure with respect to the outside of the wall during operation of the vacuum cleaner. The air channel thereby provides an airflow into the dustbin during operation of the vacuum cleaner due to the negative pressure.
Implementation Method 2
a sensor arranged for detecting dust by means of sending and/or receiving an electromagnetic signal transmitted through the dustbin
Implementation Method 3
The dust indicator further comprises a transparent window behind which the sensor is arranged, thereby obtaining shielding of the sensor from dust and debris within the dustbin.
Data Source
Figure 1
Figure 2
Figure 3a~4b
AI summary
This invention relates to a dust indicator in a vacuum cleaner, which dust indicator (200) is arranged in a wall (102) at least partly defining a space of the vacuum cleaner that is set under negative pressure with respect to the outside of the wall during operation of the vacuum cleaner. The dust indicator comprises an air channel (211) having an air inlet (212) arranged at an outer side of the wall, and an air outlet (213) arranged at an inner side of the wall, such that an airflow is directed into the space during operation of the vacuum cleaner due to the negative pressure. The dust indicator further comprises a sensor (220) arranged for detecting dust by means of sending and/or receiving an electromagnetic signal which is transmitted through the space. The air channel is arranged such that the airflow prevents dust from sticking in an area of the path of the electromagnetic signal of the sensor. The sensor is arranged behind a transparent window (232) such that it is shielded from dust and debris within said space.