Hermetic Case Sealing With Clip Relief for Internal Pressure
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Solution Overview
Problem
Conventional hermetically sealed cases require additional machining and threaded holes for screw members, making it difficult to achieve a reduction in size and compromising airtightness.
Innovation Solution
A hermetically sealed case with a clip member as a fastening mechanism, featuring elastic arms and a stopper to allow displacement of the cover from the case body when internal pressure exceeds external pressure, enabling a relief function to discharge excess pressure while maintaining airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw members are used to fasten the cover to the case body, then the airtightness is improved, but the device complexity and manufacturing time increase due to threaded hole machining
Solution Approach 1:
The patent extracts the threaded hole machining operation from the fastening process by using a press-fit structure instead. The cover is directly pressed onto the case body without requiring threaded holes, thereby eliminating the complex machining operations while maintaining the fastening function and airtightness through the press-fit connection and gasket compression.
Solution Approach 2:
The patent replaces the screw-threaded mechanical fastening system with a press-fit mechanical system. Instead of using screw members that require threaded holes, the cover is directly pressed onto the case body, substituting a simpler mechanical connection method that reduces manufacturing complexity while achieving the same fastening and sealing objectives.
2Temperature
If the hermetically sealed case is placed in high temperature atmosphere, then the internal pressure increases, but the gasket may fail to maintain airtightness
Solution Approach 1:
The patent introduces a relief hole that communicates the interior and exterior of the case, creating a dynamic pressure equalization system. When internal pressure exceeds external pressure due to high temperature, the relief hole allows pressure equalization, preventing excessive pressure differential that would compromise the gasket's sealing capability. This dynamic adjustment maintains airtightness reliability across a wide temperature range.
3Reliability
If the cover is firmly fastened to maintain airtightness, then the gap is securely sealed, but the size reduction becomes difficult due to additional fastening components
Solution Approach 1:
The patent merges the fastening function and the sealing function into a single integrated press-fit structure. The cover is directly pressed onto the case body, combining the fastening action with the gasket compression in one operation. This eliminates the need for separate screw members and threaded holes, reducing the overall case size while maintaining secure fastening and reliable sealability.
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 ensures reliable airtightness with minimal displacement, allowing for miniaturization and maintaining sensor accuracy by managing internal pressure within an elastic deformation range, even under abnormal conditions.
Implementation Method 1
the fastening member elastically deforms to allow the cover to be displaced so as to separate from the case body
Implementation Method 2
The gasket is compressed and deformed by the fastening forces of the screw members when closing the cover, thus airtightly sealing the case body
Implementation Method 3
a contact pressure force against the case body is imparted to the cover due to the recovery elasticity of the fastening member, so that the abutment of the stopper and the compressed state of the gasket are restored
Data Source
AI summary
Provided is a hermetically sealed case having a highly reliable hermetically sealed structure with a simple configuration. A hermetically sealed case 1 includes: a case body 7 having an opening 9 formed therein; a cover 8 that closes the opening 9; a gasket 10 sandwiched between the case body 7 and the cover 8; and fastening members 13 that fix the cover 8 to the case body 7. Either one of the case body 7 and the cover 8 is provided with a stopper 14 that defines the compression amount of the gasket 10. When the internal pressure of the hermetically sealed case 1 is high, the fastening members 13 allow the cover 8 to separate from the case body 7 so as to enable the abutment of the stopper 14 to be cleared.