Pressure Differential Indicator Insulated Barrier
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Solution Overview
Problem
Existing pressure differential indicators in the hydraulic field often provide false positive indications due to fluid contamination and are costly to manufacture, with issues related to hermetic seals and fluid flow impact.
Innovation Solution
A pressure differential indicator featuring an electrically conductive piston with an insulated barrier, a single cavity design, and an O-ring seal to prevent contamination and reduce manufacturing costs, allowing for easy orientation between normally closed and open positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If open contacts are exposed to free flow of fluid for pressure differential indication, then the device can indicate filter status, but electrically conductive contamination causes false positive indications
Solution Approach 1:
The patent introduces an electrically insulating barrier (such as a plastic coating or insulating material) between the electrical contacts and the fluid environment. This intermediary protects the electrical components from conductive contamination while still allowing the mechanical pressure differential indication function to operate, thereby eliminating false positives caused by fluid conductivity.
2Reliability
If glass to metal hermetic seal is used to insulate electrical pin from grounded body, then electrical insulation is achieved, but manufacturing cost and labor intensity increase substantially
Solution Approach 1:
The patent replaces expensive hermetic glass-to-metal seals with cheaper alternative insulation methods such as plastic coatings, polymer barriers, or simple insulating materials applied to the electrical pin or housing. These less expensive materials achieve sufficient electrical insulation without requiring complex hermetic sealing processes, substantially reducing manufacturing cost and labor.
3Reliability
If spring-loaded piston with open contacts is used for pressure differential indication, then filter change detection is enabled, but downstream fluid flow is impacted
Solution Approach 1:
The patent segments the device into separate functional zones: a pressure sensing chamber that captures pressure differential across the filter, and a separate electrical indication mechanism. The pressure sensing chamber uses a piston or diaphragm that responds to pressure changes without obstructing the main fluid flow path, while the electrical contacts are isolated in a protected chamber, thereby enabling filter monitoring without impacting downstream fluid flow.
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 eliminates false positives from fluid contamination and reduces manufacturing costs while maintaining efficient fluid flow, providing reliable filter change indications without the need for hermetic seals or potting barriers.
Implementation Method 1
an O-ring seal to prevent contamination
Implementation Method 2
a spring-loaded piston that is placed in the hydraulic line
Implementation Method 3
When the pressure is great enough to compress the spring associated with the piston
Data Source
AI summary
A pressure differential indicator that eliminates the risk of providing a false positive due to fluid contamination. The invention has an electrically insulated barrier between the “hot” pin and the grounded housing without the need for a hermetic seal. The indicator can be manufactured at a greater efficiency and lower cost than is found with prior art pressure differential indicators. It has a piston that can be easily oriented to yield either a normally closed or normally open position. The indicator has at least one protrusion on a plastic overmold to engage the swage collar and resist axial rotation of the pin. A pressure seal interrupting the plastic overmold sections and exposing the underlying metal to allow for an O-ring seal with no potential leak path between plastic and metal. Finally, the pressure differential indicator has all moving components contained within a single cavity.