Environmental Control Module for Helium Hard Disk Drive Sealing
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Solution Overview
Problem
Helium-filled disk drive enclosures face challenges in maintaining a sealed environment to prevent helium leakage during the introduction of helium, which affects the performance of the head assembly due to potential leak points like the port for air evacuation and helium introduction.
Innovation Solution
An environmental control module with a body member divided into sections, including a permeable member for helium passage and a desiccant sealed within a non-permeable section, which is hermetically sealed and punctured to allow helium filling while minimizing leakage, using materials like polytetrafluoroethylene and aluminum foil to manage gas flow and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the enclosure is hermetically sealed to maintain helium, then helium leakage is reduced, but it becomes difficult to introduce helium and maintain sealing at ports and openings
Solution Approach 1:
The enclosure is divided into multiple sealed sections, with each section having its own sealing structure. The port assembly is segmented into a port body, seal member, and cap, allowing independent sealing of the helium introduction port from other enclosure openings, thus maintaining hermetic sealing while enabling controlled helium access.
Solution Approach 2:
A seal member acts as an intermediary element between the port body and cap, providing the hermetic barrier. This intermediate sealing component allows the port to be opened for helium introduction while maintaining seals at all other enclosure openings, resolving the contradiction between accessibility and sealing integrity.
2Ease of operation
If ports and openings are provided for air evacuation and helium introduction, then helium can be introduced into the enclosure, but these openings create potential leak points for helium escape
Solution Approach 1:
The seal member is constructed as a flexible thin film structure that can deform to create a hermetic seal between the port body and cap. This flexible membrane allows the port to be opened for helium introduction while maintaining sealing integrity when closed, preventing helium leakage through the port opening.
Solution Approach 2:
Different regions of the enclosure are treated differently regarding sealing. The helium port area is equipped with a dedicated seal member for controlled access, while other enclosure openings are permanently sealed or have different sealing arrangements, allowing selective permeability where needed while maintaining retention elsewhere.
3Reliability
If the seal is made more robust to prevent leakage, then helium retention improves, but the complexity of the sealing structure increases
Solution Approach 1:
The seal member integrates multiple functions into a single component: it provides the hermetic barrier, allows for port opening/closing operations, and seals against both the port body and cap. This consolidation reduces the number of separate sealing elements needed, maintaining robust helium retention while limiting structural complexity.
Solution Approach 2:
The seal member serves multiple purposes: creating the hermetic seal, enabling port accessibility when needed, and preventing helium leakage. This multi-functional design achieves robust sealing without proportionally increasing complexity, as a single component performs multiple sealing and operational functions.
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 module effectively reduces helium leakage and head stack assembly off-track motion by up to 70%, enhancing the sealing integrity and operational performance of helium-filled disk drives.
Implementation Method 1
a first permeable member covering the opening in the bottom surface
Implementation Method 2
a desiccant positioned within the second section of the inner body member area
Data Source
AI summary
An environmental control module for use in a hard disk drive, the environmental control module including a body member having an outer peripheral wall defining an inner body member area, the peripheral wall comprising a top edge and a bottom edge, a dividing wall separating at least a portion of the inner body member area into a first section and a second section, and a bottom surface extending from the bottom edge of the outer peripheral wall and comprising an opening into the first section of the inner body member area. The module further includes a first permeable member covering the opening in the bottom surface, a desiccant positioned within the second section of the inner body member area, and a non-permeable member covering the second section of the inner body member.