Variable Encapsulation Housing Pressure Compensation
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Solution Overview
Problem
Existing encapsulation sections in compressed-gas-insulated electric power transmission devices face challenges with relative movement of tube sections due to internal pressure, which applies additional forces and weak points like thin-walled bellows are prone to arcing issues.
Innovation Solution
A compensation volume with a piston and cylinder, coupled to the tube sections, maintains constant pressure by varying inversely with the encapsulation volume, allowing force-free movement and enhanced resistance to arcing through a threaded flange and elastomeric sealing, ensuring robust construction and efficient fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bellows with thin walls are used to create a force-compensated arrangement, then the deformability is sufficient, but the resistance to arcs is reduced
Solution Approach 1:
The patent changes the wall thickness parameter from thin (in bellows) to thick (in pipe sections), transforming the structure from a flexible but vulnerable bellows to a robust pipe section that can withstand both deformation requirements and arc resistance requirements simultaneously
Solution Approach 2:
The patent extracts the compensation function from the bellows structure itself and relocates it to a separate compensation volume connected via channel, allowing the pipe sections to maintain uniform thickness without compromising compensation capability
2Adaptability or versatility
If pipe sections move relative to each other, then volume adjustment is possible, but additional forces are applied by the insulating medium
Solution Approach 1:
The patent introduces a compensation volume as an intermediary element that mediates between the pipe sections and the insulating medium, absorbing pressure variations and preventing them from acting as additional forces on the moving pipe sections
Solution Approach 2:
The compensation volume acts as a counterbalance to the internal pressure forces, providing an opposing volume change that compensates for the enclosure volume changes and neutralizes the net force effect on the pipe sections
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
Enables easy relative movement of tube sections without additional forces from the insulating medium, reduces the risk of arcing, and maintains a constant volume within the encapsulation housing, enhancing the structural integrity and operational efficiency.
Implementation Method 1
a compensation volume (13) which is variable inversely proportional to a change in the volume of the encapsulation volume (12)
Implementation Method 2
a channel (11) connects the encapsulation volume with a compensation volume (13)
Data Source
Figure 1
AI summary
An arrangement with an encapsulating housing comprises a first tube section (2) and a second tube section (3). The tube sections (2, 3) may move relative to each other and at least partly define a variable encapsulation volume (12). A duct (11) connects the encapsulation volume (12) to a compensation volume (13). A volume change in the encapsulation volume (12) brings about a reciprocal proportional change in the compensation volume (13). A pressure equalisation can thus be carried out on a relative movement of the tube sections.