Air Flow Sensor for Electrical Machine Using Photosensor Detection
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Solution Overview
Problem
Existing air flow sensors for electrical machines, such as image forming apparatuses, require electrical connections for operation, increasing costs and complexity, and are not suitable for detecting weaker exhaust gas flows effectively.
Innovation Solution
A simple air flow sensor configuration with a cylindrical case, a lightweight to-be-detected object, and a photosensor that detects the object's movement based on pressure changes, allowing the air purification device to operate independently without electrical signals from the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electrical connection interface is provided to enable the optional device to receive electrical signals from the electrical machine, then the optional device can be controlled to operate, but the cost increases and the device complexity increases
Solution Approach 1:
The patent replaces the electrical signal-based control system with a mechanical detection system. The air flow sensor detects exhaust gas flow mechanically and converts it to control signals, eliminating the need for electrical connection interfaces between the electrical machine and the optional air purification device.
Solution Approach 2:
The optional device determines the operational state of the electrical machine by independently detecting exhaust gas flow characteristics. This self-detection capability allows the air purification device to autonomously control its operation without requiring electrical signals or interfaces from the electrical machine.
2Object-affected harmful factors
If a discrete optional device is added to purify exhaust gas, then ultrafine particles can be collected, but the device complexity increases
Solution Approach 1:
The air flow sensor serves multiple functions: it detects exhaust gas flow presence, determines operational modes of the electrical machine, and provides control signals for the air purification system. This multi-functionality reduces the need for separate sensors and control mechanisms, simplifying the overall device structure.
Solution Approach 2:
The patent introduces an air flow sensor as an intermediary element that bridges the exhaust gas flow and the control system. This sensor converts mechanical flow characteristics into control signals, enabling the air purification device to respond to exhaust gas conditions without complex electrical interfaces.
3Difficulty of detecting and measuring
If the air flow sensor uses a slider and variable resistor mechanism, then air flow can be detected, but the manufacturing precision requirement increases
Solution Approach 1:
The patent replaces the mechanical slider and variable resistor system with a photosensor-based detection mechanism. This substitution eliminates the need for precise mechanical sliding contacts and reduces manufacturing precision requirements while maintaining effective air flow detection capability.
Solution Approach 2:
The patent introduces a photosensor as an intermediary to detect the position of the detection object optically. This optical detection method eliminates the need for direct mechanical contact and precise alignment between the slider and variable resistor, significantly reducing manufacturing precision requirements.
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
Enables cost-effective, self-sufficient air purification in electrical machines by accurately detecting exhaust gas flow and controlling the air purification function based on flow pressure, reducing the need for electrical connections and enhancing operational efficiency.
Implementation Method 1
an air flow sensor that detects exhaust gas from an electrical machine
Implementation Method 2
a photosensor that detects the object's movement based on pressure changes
Data Source
AI summary
An air flow sensor includes a case, a to-be-detected object, and a detector. The case includes an intake port and an exit port through which air is to flow. The to-be-detected object is located at a first position in the case when the air flowing from the intake port to the exit port has lower than a predetermined level of pressure, and is movable from the first position receiving the air when the air has equal to or higher than the predetermined level of pressure. The detector is disposed outside the case and is configured to detect a movement of the to-be-detected object and output an electrical signal.