Filter Lid Ceiling Portion Design for Complete Wetting
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Solution Overview
Problem
The Wet Open Change (WOC) filter replacement method faces issues with incomplete wetting due to the formation of air pockets in the filter's internal space, leading to potential dust exposure during filter replacement, as the injected liquid cannot escape through the side wall of the lid, leaving dust on the top plate uncovered.
Innovation Solution
A filter design with a ceiling portion that contacts the injected liquid, positioned below the side wall's lower end, allowing all air to escape and ensuring the liquid reaches the entire dust-adhering surface, preventing air pocket formation and ensuring complete wetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a side wall is added to the lid to maintain structural integrity and sealing, then the lid strength and sealing performance are improved, but air pockets form in the internal space preventing complete wetting of the filter surface
Solution Approach 1:
The lid is segmented into two functional parts: the side wall portion for structural support and sealing, and the ceiling portion without side wall extension for air evacuation. This segmentation allows each part to fulfill its specific function - the side wall provides mechanical strength while the ceiling portion enables complete liquid penetration to the filter surface.
Solution Approach 2:
Different regions of the lid are designed with different structural qualities. The side wall region has extended structure for strength and sealing, while the ceiling portion has reduced structure (no side wall) to facilitate air escape and liquid access. This local quality differentiation resolves the contradiction between structural integrity and wetting effectiveness.
2Quantity of substance
If the liquid injection volume is increased to ensure complete coverage, then the wetting coverage is improved, but the air pocket formation becomes more severe and liquid escape is blocked
Solution Approach 1:
The ceiling portion design extracts the air escape function from the side wall structure. By creating an open ceiling area without side wall obstruction, trapped air can be evacuated from the internal space, allowing liquid to penetrate completely to the filter surface without forming air pockets, even when large liquid volumes are injected.
3Ease of operation
If the filter replacement is performed in open space for ease of operation, then the ease of operation is improved, but dust exposure risk increases unless complete wetting is achieved
Solution Approach 1:
The ceiling portion design performs the wetting action preliminarily and completely before filter removal. By ensuring the liquid can reach the entire filter surface including upper areas through the open ceiling design, dust is pre-wetted and bound, eliminating exposure risk during subsequent open-space filter replacement operations.
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
This design ensures that the entire dust-adhering surface is completely wetted, preventing dust exposure during filter replacement and enhancing safety by eliminating the risk of dry dust flying off during the replacement process.
Implementation Method 1
A ceiling portion contactable with a liquid injected to an inside of a filter body is disposed on an upper opening of the filter body
Implementation Method 2
This design ensures that the entire dust-adhering surface is completely wetted, preventing dust exposure during filter replacement
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A filter (1) includes a filter body (2) which is hollow, and a lid (3) attached to an upper part of the filter body (2). The lid (3) includes a top plate (31) covering an upper opening (21) of the filter body (2), and a side wall (32) fitted with the upper part of the filter body (2). A lower end (32a) of the side wall (32) is located below an upper end (2a) of the filter body (2). A ceiling portion (5) contactable with a liquid injected to the inside of the filter body (2) is disposed on the upper opening (21) of the filter body (2). A lower surface (5a) of the ceiling portion (5) is located at a position (A) of the lower end (32a) of the side wall (32) or below the position (A).