Ventilator
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Solution Overview
Problem
The existing air conditioning register designs, such as those described in JP5597423B, suffer from the Coanda effect, where a portion of the air blown facing downward is deflected upward, leading to inefficient airflow directionality.
Innovation Solution
The ventilator design incorporates a first inclined member with its vertex positioned at the upstream side of the airflow direction, a convex part adjacent to the vertex, and a guide member with a second convex part, which together suppress the Coanda effect by redirecting airflow and preventing it from clinging to the inclined surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the first inclined member is designed with the vertex at the upstream side to create a high-grade feel with depth, then the aesthetic appearance is improved, but the Coanda effect occurs causing airflow to cling to the inclined surface and flow in the opposite direction
Solution Approach 1:
A convex member is introduced as an intermediary element positioned between the airflow and the first inclined member. This convex member intercepts the airflow before it can contact the inclined surface, preventing the Coanda effect from occurring while allowing the inclined member to maintain its aesthetic design with the vertex at the upstream side.
Solution Approach 2:
The convex member is positioned upstream to preemptively counteract the Coanda effect before the airflow can cling to the inclined surface. By placing the convex member at the appropriate position, the airflow is redirected away from the inclined surface before the harmful effect can take place.
2Object-generated harmful factors
If the fin is moved to the upstream side to close the space between the fin and the first inclined member, then the Coanda effect is suppressed, but the operating knob interferes with the first inclined member before the fin contacts it
Solution Approach 1:
The convex member serves as a mediator that prevents airflow from reaching the space between the fin and the first inclined member. This allows the fin to remain in its original position with the operating knob, maintaining ease of operation while still suppressing the Coanda effect through the convex member's interference with the airflow path.
3Speed
If air is blown facing downward, then the intended airflow direction is achieved, but a portion of the air flows upward due to the Coanda effect on the first inclined member
Solution Approach 1:
The convex member acts as an intermediary that blocks the airflow from clinging to the first inclined member. By positioning the convex member appropriately, it intercepts the downward airflow and prevents it from following the inclined surface upward, ensuring that all air flows in the intended downward direction.
Solution Approach 2:
The convex member is positioned to preemptively counteract the Coanda effect by interfering with the airflow before it can contact the inclined surface. This preliminary action ensures that the airflow maintains its downward direction without being deflected upward by the inclined member.
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 design effectively prevents the Coanda effect, ensuring that airflow is directed as intended, reducing the likelihood of air flowing in opposite directions and enhancing the overall efficiency of airflow directionality.
Implementation Method 1
the phenomenon noted above is caused by the airflow facing the air conditioning register from the duct clinging to the first inclined surface due to the Coanda effect when it passes over the ridges
Data Source
AI summary
A ventilator includes a first louver, second louvers, side walls, a first inclined member, and a convex part. The first inclined member is inclined so that an opening area widens from the upstream side to a downstream side. The first inclined member has a vertex of inclination in a cross-sectional view that is positioned at the upstream side. The convex part is arranged adjacent at the upstream side in the airflow direction to the vertex. In a maximum angle state in which the first louver is rotated so that an upstream end part of the first louver is closest to the first inclined member, the upstream end part is positioned further to the downstream side in the airflow direction than the vertex. The convex part projects further to an inside of the flow path than the vertex, and extends across the second louvers when seen along the airflow direction.