Conical Housing Seal Geometry for Low-Torque Instrument Closure
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Solution Overview
Problem
Existing housings for measuring instruments face challenges in achieving effective sealing against environmental influences and preventing ignition sparks from spreading in explosive atmospheres, particularly due to high screwdriving work and potential seal slippage or compression issues.
Innovation Solution
The housing design features interlaced sealing surfaces on the cover and housing part, forming a conical sealing contour that reduces screwdriving work and ensures maximum compression just before complete closure, along with a conical circumferential groove to prevent seal slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radial or axial sealing concepts are used, then sealing effectiveness is achieved, but high screwdriving work is required and seal slippage or compression issues occur
Solution Approach 1:
The sealing surfaces are designed as conical surfaces with specific angles (α and β) relative to the central axis, creating curved geometric profiles that transform the sealing mechanism. This curvature allows the sealing element to be progressively compressed along the conical path, reducing the torque required compared to flat radial or axial sealing surfaces.
Solution Approach 2:
The invention changes the geometric parameters of the sealing surfaces by defining specific angles (α for the cover sealing surface, β for the housing part sealing surface) relative to the central axis. These parameter changes create an optimized compression path that reduces screwdriving work while maintaining sealing reliability.
2Reliability
If conventional sealing surfaces are used, then sealing is achieved, but seal slippage or insufficient compression occurs
Solution Approach 1:
The conical sealing surfaces provide a curved compression path that guides the sealing element uniformly into the sealing position. This geometric curvature ensures consistent compression force distribution and prevents seal slippage by eliminating flat surfaces where slippage could occur.
Solution Approach 2:
The sealing surfaces are designed with asymmetric conical angles (α and β) relative to the central axis, creating an optimized force distribution pattern. This asymmetric geometry ensures proper sealing element compression while preventing slippage through the angled contact surfaces.
Data Source
AI summary
A housing for a measuring instrument comprising a housing part, a cover connectable to the housing part in a detachable manner and by means of which a housing opening of the housing part is closable, and a sealing element. The housing part has a central axis, which coincides congruently with a central axis of the cover when closed. The cover has at least one sealing surface on which the sealing element comes to rest at least when the housing part is completely closed. The housing part has at least one sealing surface on which the sealing element rests when the housing part is closed with the cover. A surface line of the sealing surface of the housing part and/or a surface line of the sealing surface of the cover are/is rotated with respect to the central axis, at least when the housing part is completely closed.