Frameless Self-Lock Filter Sealing Mechanism

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Solution Overview

Problem

Frameless filters in air cleaners face challenges in maintaining stable sealing performance due to local come-off of filter paper, leading to interference with the urethane sealing member and reduced dust collection efficiency, especially in drawer-type air cleaners where structural rigidity is compromised.

Innovation Solution

A frameless self-lock filter design is implemented, featuring a sealing member coupled to the filter paper edge, a filter paper case with a self-locking mechanism, and fixed shafts that rotate to form a locking or unlocking status, ensuring airtightness and preventing filter deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the filter paper is fitted to the filter paper case in a drawer-type air cleaner, then the filter can be pushed into the internal space, but the filter paper may locally come off the seating surface causing interference with the urethane sealing member

Engineering Contradiction:

Improvefilter installationVSAvoidsealing performance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The filter paper is provided with a pressing portion that concentrates pressing force on a specific local area. This pressing portion is positioned to apply force precisely where needed to prevent the filter paper from coming off the seating surface, thereby ensuring reliable sealing performance while maintaining ease of installation

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The pressing portion is designed to be pressed before the filter is fully installed in the air cleaner. This preliminary action pre-secures the filter paper to the filter paper case, preventing any potential come-off during the subsequent installation process and ensuring sealing performance from the start

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the structural rigidity of the frameless filter is increased to ensure airtightness, then the urethane sealing member can maintain proper gap with the air cleaner cover, but the filter size increases

Engineering Contradiction:

ImproveairtightnessVSAvoidfilter size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

Instead of uniformly increasing the rigidity of the entire filter structure, the pressing portion is strategically positioned to provide localized reinforcement. This localized approach increases structural rigidity only where necessary to maintain airtightness and proper sealing member positioning, without increasing the overall filter size

Inventive Principle:

Principle #3Local quality

3Reliability

If the filter paper is pressed to prevent local come-off, then sealing performance is improved, but the filter structure becomes more complex

Engineering Contradiction:

Improvesealing performanceVSAvoidfilter structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The pressing portion is integrated directly into the filter paper itself, merging the sealing function with the filter media. This integration eliminates the need for separate pressing mechanisms or additional components, improving sealing performance while keeping the filter structure simple and maintaining ease of installation

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10549226B2Frameless self-lock filter and air cleaner using the same

Publication Date: 2020.02.04 HYUNDAI MOTOR CO LTD

AI summary

A filter apparatus may include a frameless filter having a sealing member coupled to the edge portion of a filter paper which filters foreign matters, and a filter paper case having a seating space of the filter paper, and fitted and coupled to the sealing member to form a self-lock holding force with the sealing member.