Pleated Filter Holding Member Ventilation Design
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Solution Overview
Problem
In image forming apparatuses, a short distance between the filter and the fan or duct limits the collection efficiency due to a reduced filter area, which can also be exacerbated by device configuration and shape.
Innovation Solution
A filter with pleats and a holding member that includes ventilation holes or notches to allow airflow, facilitating even distribution of exhaust air across the filter surface and reducing air speed, thereby enhancing particle collection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between the filter and the fan or duct is short, then the device configuration is compact, but the filter area that contributes to collection is limited, reducing collection efficiency
Solution Approach 1:
The pleats extend in the airflow direction (third dimension), transforming a two-dimensional filter surface into a three-dimensional structure. This allows the filter to have a large collection area while maintaining a short distance between the fan and the filter, resolving the contradiction between compact device configuration and high collection efficiency.
Solution Approach 2:
The filter is divided into multiple pleats that are arranged in sequence along the airflow direction. Each pleat acts as an independent collection surface, and the cumulative effect of multiple pleats provides a large total collection area within a compact space.
2Speed
If wind flows rapidly along the pleats, then air passes through the filter quickly, but the high air speed reduces particle collection efficiency
Solution Approach 1:
The holding member is divided into multiple sections with wind-passing portions at different positions along the pleats. This segmentation allows the airflow to be gradually decelerated as it passes through each section, reducing the air speed to an optimal range for particle collection while still maintaining continuous airflow through the filter.
Solution Approach 2:
The wind-passing portions are strategically positioned at specific locations along the pleats where airflow needs to be reduced. This local modification of the holding member structure creates zones of reduced airflow velocity precisely where particle collection is most effective, without compromising the overall airflow through the filter.
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 described configuration increases collection efficiency by ensuring that exhaust air spreads evenly over the filter, reducing air speed and improving particle capture, particularly for ultrafine particles, with efficiencies exceeding 70% for particles in the range of 10-200 nanometers.
Implementation Method 1
a collecting member (62a) having a pleat and collecting particles while allowing wind to pass through
Implementation Method 2
The holding member has a wind-passing portion through which wind flowing along the pleat is allowed to pass
Data Source
AI summary
A filter includes a collecting member that has a pleat and collects particles while allowing wind to pass through, and a holding member that holds the pleat at an end in an elongated direction in which the pleat is elongated. The holding member has a wind-passing portion through which wind flowing along the pleat is allowed to pass.