Hand Dryer Duct-Integrated Sensing for Reliable Airflow Activation
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Solution Overview
Problem
Conventional auto-sensing hand dryers with infrared sensors face inadequate sensing capability due to a distance between the sensor and the airflow discharge opening, requiring users to move hands back and forth for effective operation.
Innovation Solution
The auto-sensing hand dryer integrates a sensing unit within the guiding duct, covering the air discharge opening, which includes a sensor that detects thermal radiation and a control circuit to drive the airflow generating device, ensuring the hand drying airflow is activated upon hand detection, eliminating the need for user movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the infrared sensor is disposed at a distance from the airflow discharge opening, then the device structure is simplified, but the sensing capability becomes inadequate and user convenience deteriorates
Solution Approach 1:
The sensing unit is nested within the guiding duct structure, specifically positioned in the internal space formed by the housing that encircles the air discharge opening. This nesting approach allows the sensor to be integrated into the existing device architecture without adding external complexity, while simultaneously achieving close proximity to the air discharge opening for optimal sensing capability.
2Ease of operation
If the sensing unit is positioned close to the air discharge opening, then the sensing capability is enhanced, but the device complexity increases
Solution Approach 1:
The guiding duct structure serves multiple functions: it guides the airflow from the airflow generating device to the air discharge opening, and simultaneously provides an internal space for housing the sensing unit. This multi-functionality eliminates the need for separate structural components, thereby enhancing sensing capability without proportionally increasing device complexity.
3Ease of operation
If the infrared sensor is placed away from the air discharge opening, then the airflow generation can be controlled remotely, but the hand drying efficiency decreases due to inadequate sensing
Solution Approach 1:
The sensing unit detects hands in advance before they reach the optimal hand drying position, allowing the airflow generating device to be activated preemptively. This preliminary detection and activation sequence ensures that the hand drying airflow is already available when the user places their hands, thereby maintaining both automatic control and high hand drying efficiency.
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
This configuration enhances the sensing capability, allowing the hand dryer to provide a hand drying airflow directly and efficiently, improving user convenience by eliminating the need for manual adjustment of hand placement.
Implementation Method 1
The sensing unit includes a sensor that detects thermal radiation and thus generates a sensing signal
Data Source
AI summary
An auto-sensing hand dryer includes an airflow generating device, a guiding duct connected to the airflow generating device, and a sensing unit disposed in the guiding duct. The airflow generating device generates a hand drying airflow. The guiding duct includes a connecting portion communicating with the airflow generating device, an air outlet portion communicating with the connecting portion. The air outlet portion comprises an air discharge opening and a housing encircling the air discharge opening and forming an internal space. The sensing unit is disposed in the internal space and electrically connected to the airflow generating device to determine whether to generate the hand drying airflow. The sensing unit includes a sensing region at least covering the air discharge opening. When a user hand is placed at the air discharge opening, the sensing unit senses the user hand and drives the airflow generating device to generate the hand drying airflow.