Air Exchange Fan Silencing Plate Streamlining Design
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Solution Overview
Problem
Conventional air exchange fans experience noise disturbances and water ingress issues due to the placement of the circuit board box at the air suction inlet, which affects airflow and can damage electrical components.
Innovation Solution
The air exchange fan incorporates a silencing plate with a streamlining structure above the air suction inlet and a repositioned circuit board box integrated with the silencing plate, along with a waterproof design for the leading wire passage using a single clip, to reduce noise and prevent water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the circuit board box is mounted at the air suction inlet side of the helicoid housing, then the leading wire can be easily connected to the junction box, but the smooth airflow at the air suction inlet is disturbed and noise level increases
Solution Approach 1:
The circuit board box is extracted from its conventional position at the air suction inlet and relocated to the high static pressure region of the helicoid housing. This separation removes the interfering component from the airflow path, eliminating the noise-generating obstruction while preserving electrical connection functionality through redesigned wire routing channels.
Solution Approach 2:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional spatial configuration by utilizing the vertical and radial dimensions of the helicoid housing. The circuit board box is positioned in the high static pressure region at a different spatial level, allowing wire routing through the helicoid structure itself rather than across the air suction inlet plane.
2Ease of operation
If the opening for passing the leading wire is provided on the circuit board box at the inferior location, then the wire can be routed to the junction box, but water vapor condenses into water drops that flow downward into the opening and damage the circuit board
Solution Approach 1:
Instead of providing the wire passage opening at the inferior (bottom) location of the circuit board box, the patent inverts the approach by positioning the opening at the superior (top) location. This inversion exploits gravity to prevent condensed water vapor from entering the opening, as water drops naturally flow downward away from the top-positioned opening, thereby protecting the circuit board while maintaining wire routing capability.
3Reliability
If a clip for holding the leading wire is provided at the inside of the circuit board box, then the wire can be secured, but the wire may fall off when extruded inwardly, requiring an additional external clip that increases cost and mounting complexity
Solution Approach 1:
The patent combines the wire retention function with the existing internal structure of the circuit board box by integrating a retention mechanism into the box's wall or flange structure. This merging eliminates the need for separate external clips, as the integrated structure provides both mechanical support and wire retention in a single component, reducing part count and assembly complexity while maintaining reliable wire securing.
Data Source
AI summary
An air exchange fan, includes: a frame provided with an opening, a helicoid housing with an air suction inlet disposed in the frame, an air blower disposed in the helicoid housing, and, a circuit board box mounted at the air suction inlet side, wherein a silencing plate is mounted above the outer peripheral of the air suction inlet, the silencing plate has a streamlining structure formed by outwardly expanding from the air suction inlet in an axial direction of a rotation axis of the air blower, the rotation axis of which serving as the center, within a range that is from a tongue of the helicoid housing to a location with a 90 degrees angled from the tongue in a direction opposing to the rotation direction of the air blower, and the silencing plate has a curved chamfered shape which mates with the peripheral shape of the air suction inlet.