Flexible Filter Element With Side Outlet Breather Tube
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Solution Overview
Problem
Existing respiratory protection devices face challenges in securely and ergonomically attaching filter elements, particularly in dual filter systems where filter elements are positioned on the sides of the head, requiring complex connections that can be cumbersome and interfere with the user's field of vision.
Innovation Solution
A filter element design featuring front and rear walls with a breather tube attached to the side portion, allowing for easy and secure attachment to a mask body without the need for complex connections, utilizing a single folded filter media portion that forms both walls and is sealed around the outlet, with a plenum for even airflow and structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter elements are connected to inlet ports via threaded engagement or bayonet engagement, then secure attachment is achieved, but device complexity and ease of operation deteriorate due to complex connections that can be cumbersome and interfere with user's field of vision
Solution Approach 1:
The filter element is divided into distinct functional segments: a simplified connection interface separate from the filtration media, allowing the connection mechanism to be optimized independently from the filtration function. This segmentation enables a simpler attachment system while maintaining secure connection.
Solution Approach 2:
Instead of complex mechanical engagement mechanisms (threaded or bayonet), the patent inverts the approach by using a simplified interface that relies on the filter element's structural design itself to provide secure attachment, eliminating the need for complex connection hardware.
2Area of stationary object
If filter elements are positioned on sides of the head in dual filter systems, then filtering surface area is maximized, but ease of operation deteriorates due to cumbersome connections and interference with field of vision
Solution Approach 1:
The filter element structure is segmented into a simplified connection portion and filtration portion, allowing the connection interface to be positioned optimally for ease of attachment while the filtration media maximizes surface area for filtering effectiveness.
Solution Approach 2:
Different portions of the filter element have optimized properties: the connection area features simplified geometry for easy attachment, while the filtration media area maximizes surface area and porosity for effective filtering, with each local region optimized for its specific function.
3Reliability
If complex connection mechanisms are used for filter elements, then secure attachment is achieved, but manufacturing precision requirements increase due to need for precise alignment and assembly
Solution Approach 1:
The connection interface is segmented as a distinct feature from the main filtration structure, allowing it to be manufactured and assembled with simplified tolerance requirements. The simplified geometry reduces the need for precise alignment during assembly.
Solution Approach 2:
The connection mechanism uses geometric parameters optimized for simplified assembly rather than precise mechanical engagement. The connection interface dimensions and geometry are designed to accommodate normal manufacturing variations while maintaining secure attachment.
Data Source
AI summary
The present description provides a filter element that includes an end or side portion attached breather tube. One exemplary filter element described herein includes filter media having front and rear walls each including a proximal end and a distal end, a side portion at the proximal ends of the front and rear walls, and an outlet. The filter element further includes a breather tube attached to the filter media in fluid communication with the outlet. The outlet is positioned at least partially on the side portion, and the front and rear walls of the filter media are joined together at least partially along a perimeter.