Air Purifier Gear Backlash Control for Stable Wind Direction
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Solution Overview
Problem
Existing air purifiers experience shaking issues due to gaps between the second rack and gear after rotation, causing discomfort when users manipulate the device.
Innovation Solution
An air purifier design that includes a wind direction control unit with a driving gear and driven gear system, where the driving gear rotates in reverse by a predetermined angle after stopping to maintain engagement and prevent shaking, and an elevating unit that adjusts the wind direction control unit's position to minimize user-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the second gear is engaged with the second rack to rotate the fan housing, then the fan housing can be rotated in up-down direction, but gaps between the second rack and second gear cause shaking when the user presses the display device after rotation stops
Solution Approach 1:
The system performs a preliminary action by rotating the driving gear in reverse direction by a predetermined angle after the rotation stops. This preliminary reverse rotation ensures that the gear teeth remain engaged with the rack teeth, preventing gaps from forming and thus preventing shaking when the user presses the display device.
2Loss of time
If the driving gear is stopped after rotation, then the rotation operation is completed, but gaps form between the gear and rack causing the manipulation module to shake
Solution Approach 1:
Before completely stopping the rotation, the system performs a preliminary reverse rotation of the driving gear by a predetermined angle. This ensures that the gear teeth are positioned to maintain continuous engagement with the rack teeth, preventing gaps and ensuring reliable connection after the rotation operation completes.
3Device complexity
If the second gear rotates without re-rotation after stopping, then the structure is simple, but external force can rotate the second rack about the second gear causing shaking
Solution Approach 1:
The system adds a preliminary reverse rotation step after the main rotation stops. This simple additional action ensures that the gear teeth remain engaged with the rack teeth, preventing the rack from rotating about the gear when external force (user pressing) is applied, thus maintaining engagement stability without significantly increasing device complexity.
Data Source
AI summary
An air purifier includes: a body having an inlet introducing air; a blower accommodated in the body and providing blowing force for flow of air; a filter filtering the air introduced into the body; a wind direction control unit adjusting a filtered air discharging direction; a manipulation module for outputting a signal manipulated by user; and a control device controlling the wind direction control unit based on the signal. The wind direction control unit includes: a wind direction control member rotating about the body about an axis extending horizontally; a motor providing driving force for rotating the wind direction control member; a driving gear rotated by the driving force of the motor; and a driven gear rotated by the driving gear. The control device controls the motor so that when the driving gear is rotated and then stopped, the driving gear is stopped after reversely rotated by a predetermined angle.