Vacuum-Filled Contaminant Control Filter for Disk Drives
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Solution Overview
Problem
Existing contaminant control filters for electronic enclosures face challenges in handling and contamination prevention, with loose fill media being difficult to manipulate and causing contamination, while compression molded media is expensive and less efficient in contaminant adsorption.
Innovation Solution
A method involving a filter assembly with a housing and fill port, where contaminant control media is drawn into the internal cavity under partial vacuum, preventing dust escape and minimizing external contamination, using ePTFE filter media and adsorbent materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If loose fill contaminant control media is used, then cost is reduced, but ease of operation deteriorates and contamination risk increases
Solution Approach 1:
The filter assembly is divided into separate components: a housing structure and removable contaminant control media. This segmentation allows the media to be easily inserted and removed without manipulating loose granular material, resolving the contradiction between cost and ease of operation.
Solution Approach 2:
A filter media layer is introduced as an intermediary between the loose contaminant control media and the external environment. This intermediary contains the loose media during handling and installation, preventing contamination while allowing cost-effective loose fill media to be used.
2Ease of manufacture
If loose fill contaminant control media is used, then cost is reduced, but contamination of clean room and surfaces increases
Solution Approach 1:
A filter media layer acts as an intermediary barrier that contains loose contaminant control media during handling and installation. This prevents dust and media particles from escaping into the clean room environment, resolving the contradiction between cost and contamination control.
Solution Approach 2:
The filter media functions as a flexible barrier film that encapsulates the loose contaminant control media. This thin film containment prevents media particles from becoming airborne and contaminating the clean room while maintaining the cost benefits of loose fill media.
3Ease of operation
If compression molded contaminant control is used, then ease of operation improves, but cost increases and contaminant adsorption efficiency decreases
Solution Approach 1:
The filter assembly separates the housing structure from the contaminant control media, allowing the media to be a simple loose fill material rather than requiring expensive compression molding. This segmentation maintains ease of handling while reducing manufacturing cost.
Solution Approach 2:
The filter media is positioned locally at the opening where it provides both containment and filtration functions. This localized placement allows loose fill media to be used effectively without requiring the uniform density and structure of compression molded media, reducing cost while maintaining ease of operation.
4Ease of operation
If compression molded contaminant control is used, then ease of operation improves, but contaminant adsorption efficiency decreases
Solution Approach 1:
The filter media is strategically positioned at the opening where airflow enters the housing. This localized placement ensures that all air passing through the filter interacts with the media, maximizing adsorption efficiency regardless of the media's bulk density or compression level.
Solution Approach 2:
Airflow dynamics are utilized to enhance contaminant adsorption. The housing design directs air flow through the filter media, using pneumatic forces to increase contact time and adsorption efficiency, compensating for the lower density of loose fill media compared to compression molded alternatives.
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 solution effectively fills filters with minimal external contamination, ensuring efficient contaminant control and reducing costs by using a vacuum to manage dust and media handling, while maintaining cleanliness in clean room environments.
Implementation Method 1
creating a negative pressure with the internal cavity by drawing a partial vacuum within the cavity; and drawing the contaminant control media into the internal cavity under partial vacuum
Implementation Method 2
an opening with filter media at least partially covering the opening; The filter media can comprise ePTFE
Implementation Method 3
the contaminant control media can comprise an adsorbent material and neutralization material
Data Source
AI summary
Filters, methods, and an apparatus for filling housings and both encapsulated porous and non-porous spaces with contaminant control media for placement in electronic enclosures, such as disk drive enclosures, are disclosed. In one embodiment, a filter assembly includes a housing comprising an internal cavity configured to receive contaminant control media, a fill port in communication with the internal cavity, and an opening in communication with the internal cavity, and filter media at least partially covering the opening; and contaminant control media occupying the internal cavity. Contaminant control media is deposited within the internal cavity via the fill port by means of creating a negative pressure within the internal cavity. The application of a partial vacuum facilitates movement of the contaminant control media into the internal cavity and minimizes the contamination of the filter, housing, and work space common to other loose fill filling methods.