Particulate Filter Protrusion Diverts Gas Flow in Helium Drives
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Solution Overview
Problem
Sealed disc drives with low-density gases, such as helium, face challenges in particulate capture and atmospheric clean-up due to reduced fluid flow characteristics, leading to slow filtering and particulate accumulation on critical components.
Innovation Solution
The use of protrusions to divert gas flow towards a filter, creating a pressure differential that enhances particulate capture by increasing the flow rate through the filter, and a bypass channel to facilitate gas flow, addressing issues in low-density atmospheres.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is used to capture particulates in a low-density atmosphere, then particulate capture is improved, but the flow rate through the filter is reduced due to reduced fluid flow characteristics
Solution Approach 1:
The gas flow is divided into two paths: a first portion flows through the filter for particulate capture, while a second portion flows through a bypass channel that circumvents the filter. This segmentation allows the system to maintain high overall flow rates while still achieving effective particulate filtration through the dedicated filter path.
Solution Approach 2:
A bypass channel acts as an intermediary pathway that allows a portion of the gas to circumvent the filter. This intermediary channel maintains pressure differential and fluid flow characteristics, enabling the filter to operate effectively without restricting overall system flow rate.
2Loss of time
If the filter captures all particulates, then clean-up time is reduced, but the pressure differential required slows down gas flow in low-density atmospheres
Solution Approach 1:
The gas flow is segmented into filtered and unfiltered paths, allowing the filtered path to operate at optimized pressure differentials for rapid particulate removal while the bypass path maintains overall system pressure balance and prevents flow stagnation.
Solution Approach 2:
The system changes the flow parameters by allowing different portions of gas to experience different pressure differentials - the filtered portion experiences higher pressure differential for rapid cleanup, while the bypass portion maintains lower pressure to sustain overall flow velocity in the low-density atmosphere.
3Productivity
If protrusions are added to divert gas flow, then flow rate through the filter is increased, but device complexity increases
Solution Approach 1:
The protrusions serve multiple functions: they act as flow diverters to direct gas toward the filter inlet, create the necessary pressure differential across the filter, and define the geometry of the bypass channel. This multi-functionality increases flow rate through the filter without proportionally increasing device complexity.
4Speed
If a bypass channel is created to maintain flow rate, then gas flow speed is improved, but the amount of gas through the filter is reduced
Solution Approach 1:
Instead of filtering 100% of the gas (which would slow overall flow), the system applies partial filtration by directing a sufficient portion of gas through the filter to achieve effective particulate capture while allowing the remaining portion to bypass and maintain high overall flow speed. This partial action optimizes the balance between filtration effectiveness and flow rate.
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 approach results in a significant improvement in particulate capture rates and clean-up times, with over 50% increase in flow rate and capture efficiency for particles as small as 100-500 nm, mitigating the risk of damage to disc drive components.
Implementation Method 1
The protrusion diverts air toward the filter, which can create a high pressure at an inlet of the filter relative to pressure at an outlet of the filter
Implementation Method 2
compensate for fluid flow characteristics of low-density atmospheres
Implementation Method 3
The filter membrane captures particulates from the gas as it flows through the filter membrane
Data Source
AI summary
Certain exemplary aspects of the present disclosure are directed towards an apparatus including a base deck forming a sealed cavity. A filter coupled to a surface of the base deck within the cavity filters particulate from a flow of gas in the cavity. The recirculation filter including a protrusion extending over a surface of a storage medium within the cavity that diverts gas from a surface of the storage medium toward the filter. A bypass channel, defined by a portion of the cavity and a portion of the filter, in conjunction with the protrusion forms a pressure differential that draws a first portion of the diverted gas through the filter by bypassing the filter with a second portion of the diverted gas.