Circuit Board Box Sealing to Prevent Dew in Ventilating Units
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Solution Overview
Problem
Existing ventilating devices face issues with dew formation on electrical components due to the interaction of outdoor cold air with indoor hot and humid air, leading to potential damage to circuit boards and requiring disassembly for adjustment, which complicates operation and increases the risk of further dewing.
Innovation Solution
A ventilating device design featuring a frame with an air inlet and outlet, an air blowing unit, a control circuit board, and a circuit board box with separate accommodating portions for the operation switch and control circuit board, including a sealing portion with annular ribs and a water directing rib to prevent dewing, allowing external access for adjustment without disassembling the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operation switch is provided on the outer peripheral side of the electrical function box to improve operability, then the ease of operation is improved, but dew is generated on the outer peripheral side which harms the circuit board reliability
Solution Approach 1:
The electrical function box is divided into a first accommodating portion for the operation switch and a second accommodating portion for the circuit board, with separate openings and sealing arrangements for each, allowing independent protection and access
Solution Approach 2:
A sealing portion with annular ribs is introduced as an intermediary element between the first and second accommodating portions to prevent dew from reaching the circuit board while allowing the operation switch to remain accessible
2Reliability
If the electrical function box is completely housed in a frame with sponge attached to prevent dewing, then the circuit board reliability is improved, but the operation switch requires disassembly of the frame wall for adjustment which increases device complexity and loss of time
Solution Approach 1:
The electrical function box is segmented into separate accommodating portions with differentiated access requirements, allowing the operation switch to be accessible without frame disassembly while the circuit board remains protected
Solution Approach 2:
The operation switch is extracted into a separate first accommodating portion with its own opening and sealing arrangement, independent from the frame structure, allowing access without frame disassembly
3Reliability
If the electrical function box is completely housed in a frame with sponge attached to prevent dewing, then the circuit board reliability is improved, but it requires disassembly of the frame wall for switch adjustment which causes loss of time
Solution Approach 1:
The operation switch is preliminarily positioned in a separately accessible first accommodating portion with an opening and sealing portion, enabling future adjustments without time-consuming frame disassembly
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 suppresses dew formation on the circuit board, protects the control circuit board from moisture, and allows convenient operation of the ventilating device by preventing indoor hot and humid air from entering the circuit board box, ensuring the device's reliability and user safety.
Implementation Method 1
a sealing portion is provided around the first opening
Data Source
AI summary
A ventilating device including: a frame provided with an air inlet and an air outlet, an air blowing unit for directing air, a control circuit board for controlling the air blowing unit, an operation switch for adjusting a rotating speed of the air blowing unit, and a circuit board box for accommodating the control circuit board. The circuit board box includes: a first accommodating portion in which the operation switch is housed and a second accommodating portion in which the control circuit board is housed. The first accommodating portion includes: a first opening that functions as an operation port; and a panel for covering the first opening. The frame is provided with a second opening opposite to the first opening. The panel is exposed from the second opening to exterior of the frame. A sealing portion is provided around the first opening.