Pressure Measuring Device Air Passage Plug Connection
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Solution Overview
Problem
Existing pressure measuring devices face challenges in protecting diaphragms from damage during high-pressure or steam jet cleaning, especially in compact designs where lateral impact protection devices are not feasible, and there is a need for effective pressure compensation and moisture escape.
Innovation Solution
A pressure measuring device design that combines an air passage for pressure compensation with a light-emitting diode, using a two-part barrier system where the diaphragm is protected by a cylindrical sleeve acting as an impact device, and the light-emitting diode is integrated within the plug connection, allowing for pressure compensation and status indication without external design changes or additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid-repellent diaphragm is used for pressure compensation, then pressure compensation is achieved, but the diaphragm is exposed to high-pressure or steam jet cleaning and could be destroyed
Solution Approach 1:
The patent introduces an intermediary structure (the housing wall integration and duct system) that mediates between the cleaning environment and the diaphragm. The diaphragm is placed within a duct system that channels cleaning fluids away from it, while still allowing pressure compensation to occur. This intermediary arrangement protects the diaphragm from direct jet impact while maintaining its pressure compensation function.
2Object-affected harmful factors
If impact protection devices are added to protect the diaphragm, then protection against cleaning jets is achieved, but the device size increases and is unsuitable for compact designs
Solution Approach 1:
The patent merges the impact protection function with the existing housing structure. The housing wall itself is designed to provide protection, and the duct system is integrated into the housing rather than being a separate external component. This combining of functions allows protection against cleaning jets without adding external protruding elements that would increase the device diameter.
Solution Approach 2:
The patent transitions from a lateral/protruding protection approach to an internal/integrated protection approach. Instead of adding protection elements that extend outward from the housing, the protection is achieved through the internal configuration of the housing wall and duct system, utilizing the third dimension (depth within the housing) rather than increasing the external footprint.
3Reliability
If a duct system with diaphragm is used for air passage, then pressure compensation is achieved, but moisture can enter the duct system during cleaning operations
Solution Approach 1:
The patent uses a flexible, liquid-repellent diaphragm membrane that acts as a selective barrier. This thin film allows gas molecules to pass through for pressure compensation while repelling liquid moisture. The diaphragm's liquid-repellent properties create a hydrophobic barrier that prevents moisture ingress while maintaining the air passage function.
4Device complexity
If the vent opening is made small to be less visible, then the external design is maintained, but moisture can still enter through the opening during cleaning
Solution Approach 1:
The liquid-repellent diaphragm serves as a selective barrier at the vent opening, allowing the opening to remain small and inconspicuous while still preventing moisture ingress. The diaphragm's surface properties create a hydrophobic barrier that blocks liquid while permitting gas passage, thus maintaining both the simple external design and protection against moisture.
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 effectively protects the diaphragm from cleaning jets, enables pressure compensation, and allows for quick moisture escape, while maintaining a compact and cost-effective design suitable for all types of measuring devices, including those without display units.
Implementation Method 1
a liquid-repellent diaphragm is arranged within this duct system
Data Source
AI summary
A pressure measuring device is disclosed that includes a housing, a pressure measuring cell, evaluation electronics for processing measurement signals generated by the pressure measuring cell, a plug connection formed at the housing for transmitting the processed measurement signals to an external receiving unit, and an air passage which enables pressure compensation between the interior of the housing and the exterior of the housing. The plug connection includes a cylindrical sleeve and an insert part disposed therein, wherein the air passage is formed as a two-part barrier having a first liquid barrier formed as a duct system from the interior of the housing via the plug connection and a second liquid barrier having a liquid-repellent diaphragm and disposed in an area within the duct system, and wherein the insert part has a first recess into which the diaphragm is inserted. The insert part has a second recess, which is arranged at a distance from the first recess and in which a light-emitting diode signalling a status of the measuring device is inserted, wherein the cylindrical sleeve also has a recess at the side opposite the light-emitting diode, which recess on the one hand, acting as a part of the duct system or air passage, allows pressure compensation and, on the other hand, allows the light-emitting diode to be visible.