Sealing Device for Pressure Measuring Cell Housing
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Solution Overview
Problem
Existing pressure measuring devices face challenges in sealing the housing of pressure measuring cells, particularly when using casting materials, which can negatively impact the temperature behavior and long-term performance of capacitive measuring systems by coming into contact with electronics components.
Innovation Solution
A sealing device comprising a dimensionally stable hard part and an elastic soft part, produced via two-component injection molding, provides a tight seal for the pressure measuring cell housing while allowing for pressure compensation, ensuring that the casting material does not penetrate the area with electronics components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a casting material is used to fill the housing, then protection of electrotechnical components and reduction of inner air volume are improved, but the temperature behavior and long-term performance of capacitive measuring systems deteriorate when the casting material enters the direct vicinity of electronics components
Solution Approach 1:
The housing is divided into two distinct spaces: a first space for receiving electrotechnical components that remains free of casting material, and a second space that is filled with casting material. This segmentation allows the benefits of casting material (protection and reduced air volume) to be realized while preventing the harmful effects (temperature behavior degradation) by keeping the casting material away from the electronics components.
2Reliability
If a sealing device with both hard and soft parts is used, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The sealing device combines a hard part and a soft part into a single integrated component that is attached to the housing in one piece. The hard part provides structural support and dimensional stability, while the soft part provides the sealing function. This merging approach achieves reliable sealing without requiring multiple separate components, thus avoiding increased device complexity.
3Manufacturing precision
If a two-component injection molding method is used, then manufacturing precision is improved, but manufacturing complexity increases
Solution Approach 1:
The two-component injection molding method is used to produce the hard part and soft part as a single integrated sealing device in one manufacturing process. This approach achieves high sealing precision by ensuring perfect bonding between the hard and soft parts while eliminating the need for separate manufacturing and assembly steps, thus actually simplifying the overall manufacturing process despite using an advanced molding technique.
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 enables reliable sealing of pressure measuring cell housings, protecting electronics components from casting materials while maintaining pressure compensation, thus improving the temperature stability and long-term performance of capacitive measuring systems.
Implementation Method 1
the sealing device is made of a dimensionally stable hard part having at least one elastic soft part disposed, in particular attached, in the region of the pressure compensation opening
Implementation Method 2
The hard part and the at least one soft part are preferably produced by means of a two-component injection molding method
Data Source
AI summary
The invention relates particularly to a sealing device (8) for sealing a pressure measuring cell housing (3), wherein the sealing device (8) comprises a pressure compensation opening (23; 23′) for a pressure compensation line (21; 21′; 21″, 20) of a pressure measuring cell (4) received in the pressure measuring cell housing (3), wherein the sealing device (8) is made of a dimensionally stable hard part (18; 18*; 18′) having at least one elastic soft part (19; 19°; 19*; 19′), which is disposed in the region of the pressure compensation opening (23; 23′) on the hard part (18; 18*; 18′).