Hermetic Sealing Assembly Using Monolithic Ceramic Separator
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Solution Overview
Problem
Industrial electric devices, such as motors, face challenges in withstanding corrosive process gases in the oil and gas industry, particularly due to contaminants like hydrogen sulfide and water, which lead to corrosion and leakage issues in the stator assembly, and current sealing methods using O-rings or metallic seals are not effective in harsh environments.
Innovation Solution
A hermetic sealing assembly using a monolithic ceramic separator with chemical bond joints, mechanically isolated from the stator, is introduced to isolate the rotor and stator, minimizing leakage and corrosion, and reducing eddy current losses, without the use of organic or metallic seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional O-rings or metallic seals are used for stator encapsulation, then the sealing assembly can be easily manufactured and assembled, but they fail to provide effective protection against corrosive process gases in harsh environments
Solution Approach 1:
The patent employs a composite sealing assembly consisting of a ceramic separator (providing chemical inertness and corrosion resistance) combined with chemically bonded joints (providing hermetic sealing). This composite structure integrates materials with complementary properties to simultaneously achieve reliability in corrosive environments and effective sealing, overcoming the limitations of traditional single-material seals.
Solution Approach 2:
The patent replaces traditional mechanical sealing systems (O-rings, metallic seals with moving parts) with a chemically bonded ceramic sealing system. The chemical bonds create a hermetic seal that is inherently resistant to corrosion and eliminates the mechanical wear and chemical degradation issues associated with traditional seals, thereby improving reliability without significantly complicating manufacturing.
2Power
If the gap between stator and rotor is minimized to maximize magnetic field strength, then electrical device performance improves, but mechanical clearance requirements and risk of contact increase
Solution Approach 1:
The patent uses a thin ceramic separator as a rigid barrier that can be precisely positioned in the gap between stator and rotor. The ceramic material provides both mechanical strength to maintain clearance and chemical inertness to prevent corrosion, allowing the gap to be minimized for optimal magnetic coupling while maintaining reliable mechanical separation.
3Reliability
If encapsulator sections are designed to withstand large pressure differentials and temperature gradients, then reliability in harsh environments improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the encapsulator into multiple ceramic sections that can be manufactured separately and then joined through chemically bonded joints. This segmentation allows each section to be optimized for specific pressure and temperature conditions, while the chemical bonds between sections provide hermetic sealing and structural integrity, managing complexity through modular design.
Solution Approach 2:
The sealing assembly uses composite construction with ceramic separator and chemically bonded joints, where each material is selected for its specific properties. The ceramic provides thermal and chemical stability, while the chemical bonds provide hermetic sealing, creating a composite structure that withstands harsh environments without excessive complexity.
4Loss of energy
If monolithic ceramic separator is used to minimize eddy current losses, then electrical efficiency improves, but manufacturing and joining complexity increases
Solution Approach 1:
The patent replaces mechanical joining methods (which would create gaps and increase eddy current losses) with chemically bonded joints. The chemical bonds create a hermetic, electrically continuous connection between ceramic sections, minimizing eddy current losses while providing strong mechanical attachment, thereby achieving both electrical efficiency and manufacturability.
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 limits helium gas leaks to a rate lower than 1×10−8 std cm3/sec, protects the stator from corrosive environments, and minimizes electrical losses, enabling the use of non-magnetic barriers in large electric motors without substantial performance impact.
Implementation Method 1
Each joint of the sealing assembly is a chemically bonded joint
Implementation Method 2
minimize eddy current losses to reduce overall electrical losses in the machine
Data Source
AI summary
Disclosed herein is a system including a motor comprising a rotor, a stator and a sealing assembly having at least one joint and a monolithic ceramic separator. Each joint of the sealing assembly is a chemical bond joint, and the monolithic ceramic separator is disposed in a gap between the rotor and the stator of the motor such that the sealing assembly hermetically isolates the rotor and the stator.