A filter housing for an air ventilation system
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Solution Overview
Problem
In air ventilation systems, existing filter housings with mechanical clamping mechanisms can cause leakage of hazardous substances during filter replacement due to improper positioning or clamping, and obstruct airflow when a probe is needed downstream of the filter.
Innovation Solution
A filter housing design with clamping mechanisms located on opposite sides of the filter holder, featuring a release device with a handle that can be pulled out and rotated to release the filter, and a security element to ensure correct mounting, allowing the probe to be positioned close to the filter without obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical clamping mechanism is used to secure the filter, then the filter sealing is improved, but the risk of leakage during filter replacement increases due to potential positioning or clamping errors
Solution Approach 1:
The filter holder is pre-loaded with spring elements that automatically engage with the filter frame when the filter is inserted. This preliminary positioning action ensures correct alignment before the clamping mechanism is activated, reducing the risk of improper positioning during replacement operations
Solution Approach 2:
The design incorporates visual indicators that provide immediate feedback on filter insertion depth and clamping status. These indicators allow operators to verify correct filter positioning and secure clamping before resuming normal operation, preventing leakage due to improper installation
2Device complexity
If the clamping mechanism is positioned downstream under the filter, then the device complexity is reduced, but the probe mounting space is obstructed
Solution Approach 1:
The clamping mechanism is divided into separate modular components distributed along the sides of the filter holder rather than being concentrated in one location. This segmentation allows the probe to be mounted in the previously occupied downstream space without interfering with clamping operations
Solution Approach 2:
The clamping mechanism is relocated from the downstream vertical space to the lateral horizontal space along the sides of the filter holder. This dimensional relocation resolves the spatial conflict between the clamping mechanism and the probe mounting area
3Force
If the clamping mechanism is operated with a tool for turning bolt head shaped elements, then the clamping force is increased, but the ease of operation decreases due to the need for tools within the bag
Solution Approach 1:
The clamping mechanism incorporates a self-contained ratchet and pawl system that maintains clamping force without requiring continuous tool operation. Once the filter is secured, the mechanism self-locks and maintains the clamping force throughout operation, eliminating the need for tools during the filtering process
Solution Approach 2:
The clamping mechanism transitions from a static bolted connection to a dynamic ratchet system that allows incremental adjustment and secure locking. The pawl engages with ratchet teeth to maintain clamping force, providing both ease of operation and sufficient clamping capability
4Device complexity
If no clear indicator of correct filter positioning is provided, then the device complexity is reduced, but the reliability of filter installation increases due to potential undetected mispositioning
Solution Approach 1:
Visual indicators change color or position to indicate filter insertion depth and correct positioning. These indicators provide immediate visual feedback to operators, ensuring reliable filter installation without adding complex mechanical or electronic monitoring systems
Data Source
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AI summary
A filter housing adapted to be mounted in an air ventilation system, which filter housing has: an upstream air entrance opening defined by an air entrance opening frame, a downstream air exit opening defined by an air exit opening frame and located opposite of the air entrance opening, a rear wall extending between and attached with the air entrance opening frame and the air exit opening frame, a front opening opposite to the rear wall, the front opening being defined by a front opening frame, and a cover sealing the front opening when the cover is closed; a movable filter holder arranged within the housing and arranged to receive a filter through the front opening; and two clamping mechanisms arranged at opposite first and second walls of the housing, which first and second walls extend between the entrance opening frame and the exit opening frame, each clamping mechanism being connected with the filter holder to clamp the filter in a clamped position. Each clamping device has a release device engaged with the filter holder, and is arranged for releasing the filter from the clamped position to a released position by moving the filter holder. The release device has a handle arranged at the front opening. Each handle is arranged to be in a locked state when the filter is in the clamped position, unlocked by being pulled out a distance, and then rotated to a release position in order to release the filter.