Metal Fitting Seal for Ceramic Electrodes in Electro-Coalescers
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Solution Overview
Problem
The existing electro-coalescer designs face challenges due to thermal expansion mismatches between metals and ceramics, leading to structural failures, power losses, and maloperation, particularly with voids and bubbles in ceramic tubes and air pockets within the electrode assembly.
Innovation Solution
The design incorporates rod-shaped ceramic-insulated electrodes with a sealing assembly featuring a metal fitting with a similar thermal expansion coefficient to the ceramic, along with a spacer and sealing components to prevent fluid leakage and structural damage, ensuring a robust and cost-effective construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal parts are used in contact with ceramic tubes, then electrical conductivity and structural strength are improved, but thermal expansion mismatch causes structural failure
Solution Approach 1:
The patent introduces a metal fitting as an intermediary component between the metal parts and ceramic tube. This fitting acts as a buffer that absorbs thermal expansion differences, preventing direct stress transmission to the ceramic tube while maintaining electrical conductivity and structural strength.
Solution Approach 2:
The patent modifies the physical parameters of the interface by introducing a compliant metal fitting that can deform elastically. This changes the rigid-rigid interface into a rigid-compliant-rigid interface, allowing the system to accommodate thermal expansion parameter changes without failure.
2Reliability
If rigid ceramic construction is used, then electrical insulation and process sealing are improved, but misalignment during assembly or service causes structural failure
Solution Approach 1:
The patent employs flexible metal fittings and sealing elements that can deform to accommodate misalignments. These flexible components compensate for assembly tolerances and service deformations while maintaining the electrical insulation integrity of the rigid ceramic electrode.
Solution Approach 2:
The design incorporates compliant metal fittings in advance of potential misalignment issues. These fittings are pre-positioned to absorb and compensate for expected assembly tolerances and thermal deformations before they can cause structural failure.
3Reliability
If air pockets or gaps are left between conductor and ceramic tube, then thermal expansion stress is reduced, but power losses increase and maloperation occurs
Solution Approach 1:
The patent introduces a conductive grease or compound as an intermediary substance between the conductor and ceramic tube. This intermediary eliminates air gaps (which cause power losses) while still allowing for thermal expansion accommodation, as it remains compliant under thermal stress.
Solution Approach 2:
The patent creates a composite interface combining the conductor, compliant grease/compound, and ceramic tube. This composite structure eliminates the harmful air gap while maintaining the beneficial thermal expansion accommodation, achieving both low power loss and thermal stress resistance.
4Strength
If metal parts with sharp edges are used, then structural strength is improved, but electrical stress intensification over ceramic material occurs
Solution Approach 1:
The patent applies different geometric qualities to different parts of the metal components. The bulk structure maintains strength with appropriate geometry, while the surfaces contacting the ceramic tube are specifically designed with rounded edges and smooth transitions to eliminate electrical stress concentration points.
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
This configuration maintains system integrity by minimizing thermal expansion-induced breakage and power losses, enhancing the durability and efficiency of the electro-coalescer system.
Implementation Method 1
the coefficient of thermal expansion of most metals, including suitable conductive metals, like copper, is vastly different from that of ceramics, like alumina. Therefore, the temperature difference to which the electrodes are subjected during their service life can easily cause the electrodes to fail structurally
Implementation Method 2
a sealing assembly. The sealing assembly may be configured to form a seal between the through-holes and the rod-shaped insulated electrodes, preventing fluid from traversing from the process chamber into the electric enclosure
Implementation Method 3
Embodiments disclosed herein relate to electro-coalescers. More specifically, embodiments herein relate to attachment of rod-shaped insulated electrodes within an electro-coalescer vessel
Data Source
AI summary
Electro-coalescer systems herein may include a vessel, a base plate separating a process chamber and an electric enclosure, rod-shaped ceramic insulated electrodes, and a sealing assembly. An end of the electrodes is located within the electric enclosure. The electrodes traverse respective through-holes of the base plate into or through the process chamber, where a second portion is supported by a spacer, configured to maintain a position of the electrodes while allowing fluid passage. The sealing assembly forms a seal between the through-holes and the rod-shaped insulated electrodes, preventing fluid traversing from the process chamber into the electric enclosure. The sealing assembly may include: a metal fitting disposed around the rod-shaped insulated electrode; metal o-rings; metal seats; and a closing nut. The metal fitting has a coefficient of thermal expansion similar to that of the ceramic insulator, thereby preventing breakage of the electrodes during use.