Wind flow generating device adapted to hand dryer
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Solution Overview
Problem
Conventional wind flow generating devices for hand dryers fail to reduce turbulence in airflow and effectively dissipate heat from the electric motor housing.
Innovation Solution
A wind flow generating device with a guide frame featuring guide vanes that direct airflow along the motor housing, reducing turbulence and enabling heat dissipation by positioning guide channels with varying contours and inclinations to guide airflow directly towards the motor housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the conventional deflector guides airflow towards the outer side of the deflector, then the airflow can be directed away from the fan blade, but the airflow impacts the housing and causes turbulence
Solution Approach 1:
The deflector is segmented into multiple fins (first fins and second fins) arranged in specific patterns. The first fins guide airflow to the outer side while the second fins redirect it along the housing surface, dividing the airflow control function into multiple stages to eliminate turbulence
Solution Approach 2:
The second fins are designed with curved surfaces that match the contour of the housing. This curvature allows the airflow to follow the housing surface smoothly rather than impacting it directly, reducing turbulence while maintaining directional control
2Ease of operation
If the conventional deflector uses second fins to guide airflow, then the airflow can be directed towards the interior or exterior of the electric motor, but the airflow cannot keep close to the housing for heat exchange
Solution Approach 1:
The second fins are designed with curved surfaces that conform to the housing contour, enabling the airflow to follow the housing surface closely. This curvature ensures continuous contact between airflow and housing for effective heat exchange while maintaining proper airflow guidance
Solution Approach 2:
The deflector employs different fin configurations in different regions: first fins for initial airflow redirection and second fins with specific curvature for downstream airflow following. Each region's fin design is optimized for its local function, with second fins specifically designed to maintain close proximity to the housing for heat exchange
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 solution effectively reduces airflow turbulence and allows for efficient heat dissipation from the electric motor housing, improving airflow directionality and thermal exchange.
Implementation Method 1
a rotatable fan blade provided in the bowl and connected with the driving shaft to generate an airflow in the bowl
Implementation Method 2
a guide frame provided in the bowl and fixed to the motor housing... a plurality of guide vanes formed on the support ring at intervals and extending along a surface of the motor housing... each guide channel guides the airflow to be discharged from the air outlet gap
Implementation Method 3
the airflow cannot keep close to the housing of the electric motor because the airflow is guided by the plurality of second fins, as a result, the electric motor cannot exchange heat with the airflow specifically
Data Source
AI summary
A wind flow generating device adapted to a hand dryer includes an electric motor provided with a motor housing and a driving shaft, a wind barrel including a bowl, a rotatable fan blade connected with the driving shaft for generating an airflow, and a guide frame fixed to the motor housing. An air outlet gap is jointly defined by the motor housing and the bowl, the guide frame includes a support ring fixed to the motor housing, and a plurality of guide vanes formed on the support ring at intervals and extending along a surface of the motor housing. Any adjacent two of the guide vanes define a guide channel along the motor housing. An inlet and an outlet of each guide channel are positioned on different contour lines of the motor housing, and each guide channel guides the airflow to be discharged from the air outlet gap.