Filter assembly and air purifier including same
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Solution Overview
Problem
Existing air purifiers face challenges in efficiently replacing multiple filters due to cumbersome detachment and mounting processes, differential pressure issues leading to premature filter replacement, and vortex formation between filters and fans, which reduce purification efficiency.
Innovation Solution
A filter assembly with separate first and second filter regions, supported by a filter holder with edge and partitioning portions, and controlled fan units operating at different speeds to manage differential pressures and prevent vortex formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple filters are individually detached and mounted onto the frame, then each filter can be replaced, but the process becomes time-consuming and cumbersome
Solution Approach 1:
The patent combines multiple filters into a single integrated filter assembly that can be attached to or detached from the frame as one unit. This merging of multiple separate filter components into a unified assembly allows operators to replace all filters simultaneously through a single attachment/detachment operation, eliminating the need to handle each filter individually and significantly reducing replacement time and complexity.
2Device complexity
If both upper and lower fans operate at the same rotation speed, then the fan system is simple to control, but differential pressures vary across filters causing premature replacement
Solution Approach 1:
The patent implements dynamic fan speed control where the controller adjusts the rotation speeds of upper and lower fans differently based on real-time differential pressure readings from pressure sensors. This dynamic adjustment allows each fan to operate at an optimized speed that maintains balanced differential pressures across all filters, preventing premature filter replacement while maintaining simple control architecture through automated feedback control.
3Productivity
If air flows toward both upper and lower fans after passing through the filter, then air circulation is achieved, but vortices form between filters and fans reducing purification efficiency
Solution Approach 1:
The patent applies local quality modification by introducing flow guide structures (such as guide walls or flow straighteners) in specific locations where vortices form between the filters and fans. These localized structural modifications redirect airflow in problem areas to eliminate vortex formation, while maintaining overall air circulation efficiency. The flow guides are strategically positioned to address local flow issues without requiring changes to the entire fan or filter system.
Data Source
AI summary
An air purifier include: a frame; a filter assembly detachably mounted in the frame for filtering air; a fan assembly providing a blowing force to move air from an outside of the frame to an inside of the frame; and a controller for controlling an operation of the fan assembly. The filter assembly includes: a plurality of filter members of different types; and a filter holder supporting the plurality of filter members and including a first filter region and a second filter region which are separate from each other.