Air-conditioning indoor unit
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Solution Overview
Problem
Air conditioners using the Coanda effect often experience short circuits due to upward airflow being drawn into the intake port, necessitating the use of an airflow guide plate to correct the airflow direction.
Innovation Solution
The air-conditioning indoor unit design features a Coanda vane with a curved bottom surface and an upwardly oriented distal end, allowing the Coanda airflow to separate from the casing front surface, preventing short circuits without the need for a conventional airflow guide plate, while maintaining a gentle incline angle to ensure effective airflow direction adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a Coanda vane is disposed in the front surface of the blow-out port to create upward Coanda airflow, then the airflow direction is improved, but short circuits occur as the airflow is drawn into the intake port
Solution Approach 1:
The Coanda vane incorporates a curved surface instead of a flat plate, allowing the airflow to follow a curved path that separates from the casing front surface. This curvature enables the airflow to achieve upward direction while avoiding direct contact with the intake port area, thus preventing short circuits while maintaining effective airflow control.
Solution Approach 2:
The Coanda vane is positioned to extend beyond the front surface of the casing in the outward direction, creating a three-dimensional configuration. This spatial extension allows the airflow to be directed upward and outward simultaneously, separating the airflow path from the intake port location and eliminating short circuiting while achieving the desired airflow direction.
2Ease of operation
If the Coanda vane has a steep incline angle to create upward airflow, then airflow direction is improved, but the distance between the distal end and casing front surface is reduced
Solution Approach 1:
The curved surface of the Coanda vane allows for a gentler incline angle compared to a straight inclined plate. The curvature gradually directs the airflow upward over the length of the vane, achieving effective airflow direction control while maintaining a longer distance between the distal end and the casing front surface.
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 enables upward or ceiling blowing of air without short circuits, even when the intake port is above the casing front surface, ensuring efficient airflow distribution and maintaining a sleek design by eliminating the need for an airflow guide plate.
Implementation Method 1
the Coanda vane having a bottom surface and being configured to cause the flow of blown air to be attracted toward said bottom surface via the Coanda effect, thereby making the blown air into a Coanda airflow along said bottom surface
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Provided is an air conditioner that can create a Coanda airflow progressing in a direction that avoids short circuits even without a conventional airflow guide plate. In an air conditioner (10), a curved surface (320) curved into a convex shape is formed in an outer surface (32a) of a Coanda vane (32). The orientation of the Coanda vane (32) is such that the Coanda vane separates from a casing front surface as the Coanda vane separates from the blow-out port (15), and a Coanda airflow along the curved surface (320) of the Coanda vane (32) can therefore progress upward while separating from the casing front surface. The angle of the distal end of the Coanda vane (32) is more of an upward angle than when the Coanda vane (32) has a flat plate shape, and an upward air flow can be created without making the incline angle of the Coanda vane (32) a steep angle.