Blower and air-conditioning device
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Solution Overview
Problem
In axial flow fans installed in devices with large pressure loss, such as air-conditioning devices, the radial velocity component of air currents collides with the connecting portion, leading to reduced blowing performance.
Innovation Solution
The fan design incorporates a connecting portion with recessed portions to minimize the area of collision for radial airflow, reducing turbulence and maintaining the structural integrity of the stationary blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a ring-shaped connecting portion is used to connect stationary blades, then structural integrity is improved, but blowing performance deteriorates due to collision with radial velocity component
Solution Approach 1:
The ring-shaped connecting portion is segmented by forming recessed portions that divide the continuous ring structure into multiple sections. This segmentation allows the air current to pass through the recessed portions without significant obstruction, reducing the harmful collision effect while maintaining the overall structural integrity of the connecting portion.
Solution Approach 2:
The harmful portion of the connecting portion is extracted by creating recessed portions that remove material from the ring structure. These recessed portions are strategically positioned to align with the path of the radial velocity component, allowing the air current to pass through without colliding with the solid structure, thus eliminating the performance deterioration.
2Ease of manufacture
If the connecting portion is made solid to ensure strength, then manufacturing simplicity is maintained, but air flow is obstructed
Solution Approach 1:
The solid connecting portion is transformed into a segmented structure with recessed portions. These recesses are formed by removing material in specific patterns from the ring structure, creating channels that guide air flow through the connecting portion. The segmentation is achieved through standard manufacturing processes such as molding or machining, maintaining ease of manufacture while eliminating air flow obstruction.
Solution Approach 2:
The connecting portion is designed with a porous-like structure featuring recessed portions that allow air permeability. Although the material itself remains solid and non-porous, the macro-scale recessed structures create effective porosity that enables air flow passage, reducing obstruction while maintaining structural strength and manufacturing simplicity.
Data Source
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AI summary
A fan includes an impeller including a boss that is a rotation center, and a plurality of blades that are provided on an outer peripheral surface of the boss; a motor and a motor fixing portion rotationally driving the impeller; a housing accommodating the impeller; a plurality of stationary blades disposed downstream of the impeller and connecting the motor fixing and the housing; and a connecting portion disposed between the housing and a rotation axis of the impeller, and extending in a rotation direction of the impeller and connecting the plurality of stationary blades. The connecting portion has a recessed portion for passing wind that flows in a radial direction of the impeller.