Dielectric Fitting for Pressure Regulator with Isolator Plate
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Solution Overview
Problem
Conventional pressure regulators with dielectric connections face issues such as delamination, reduced electrical insulation, structural failures, high manufacturing costs, and maintenance challenges due to over-molding of metallic inserts with polymers, which can lead to fluid leakage and mechanical deflection.
Innovation Solution
A dielectric fitting for pressure regulators featuring a flange with an isolator plate and isolator cover, blind tapped holes to prevent water entry, a drip-lip feature to prevent wicking, and a metallic reinforcement plate to distribute clamping loads, ensuring reliable electrical isolation and reduced creep.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If over-molding of metallic inserts with polymer is used to create dielectric connection, then electrical isolation is achieved, but delamination and structural failures occur
Solution Approach 1:
The dielectric fitting is divided into separate components: a metallic insert and an over-molded polymer portion. The segmentation allows the metallic insert to provide structural strength while the polymer provides electrical isolation, eliminating the delamination issue by making the components separable rather than relying on a bonded interface.
Solution Approach 2:
The dielectric fitting uses composite construction combining metallic insert and polymer material. The metallic insert provides mechanical strength and structural integrity, while the polymer material provides electrical isolation properties. This composite approach resolves the contradiction by allowing each material to perform its optimal function without compromising the other.
2Reliability
If over-molding process is used to create dielectric connection, then electrical isolation is provided, but manufacturing costs increase
Solution Approach 1:
The dielectric fitting uses a cost-effective polymer material that can be over-molded onto a relatively simple metallic insert. The polymer portion can be manufactured using standard injection molding processes, which are cost-effective for mass production. This approach provides reliable electrical isolation without requiring expensive specialized materials or processes.
3Reliability
If metallic insert with over-molded polymer is used, then electrical isolation is provided, but field replacement of components becomes difficult
Solution Approach 1:
The dielectric fitting is designed as separable components with the polymer portion over-molded onto the metallic insert but not permanently bonded in a way that prevents separation. This segmentation allows field replacement of the polymer portion if it becomes damaged, while the metallic insert can be retained if still serviceable.
Solution Approach 2:
The design allows for selective replacement of components in the field. If the polymer portion becomes damaged or degraded, it can be replaced while recovering and retaining the metallic insert, reducing waste and lowering field replacement costs.
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 provides enhanced electrical isolation, prevents water ingress, reduces mechanical deflection, and allows for field replacement of components, improving the reliability and maintainability of pressure regulators while maintaining cost-effectiveness.
Implementation Method 1
an isolator cover disposed between the flange and the isolator plate to electrically isolate the flange from the housing
Implementation Method 2
a drip-lip feature to prevent wicking
Implementation Method 3
a metallic reinforcement plate to distribute clamping loads, ensuring reliable electrical isolation and reduced creep
Data Source
AI summary
A dielectric fitting for a pressure regulator includes a flange adapted to be disposed next to a housing of the pressure regulator, an isolator plate disposed next to the flange and adapted to be disposed between the flange and the housing, and an isolator cover disposed between the flange and the isolator plate to electrically isolate the flange from the housing.