Explosion-proof Machine Internal Pressure Reduction Device
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Solution Overview
Problem
Existing explosion-proof electric machines face challenges in reducing internal pressure in critical regions, such as below the connection box, leading to increased casing thickness, mass, and volume, which restricts operation and increases costs, while current solutions are costly, inflexible, and difficult to maintain.
Innovation Solution
An internal pressure reduction device comprising a base and volume filling pieces that can be easily installed and removed, made from polymeric or metallic materials, allowing for versatile configuration and rotation of the connection box, with engaging means and passage tracks for cables, to manage pressure without adhering to the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the casing thickness is increased to withstand internal explosion pressure, then the strength and reliability are improved, but the mass and volume of the machine increase
Solution Approach 1:
The invention divides the casing into multiple sections or zones with different thicknesses. The critical region below the connection box has increased thickness to withstand explosion pressure, while other non-critical regions maintain standard thickness. This segmentation allows the casing to provide necessary strength only where required, reducing overall mass and volume.
2Strength
If the casing thickness is increased to withstand internal explosion pressure, then the strength and reliability are improved, but the volume of the machine increases
Solution Approach 1:
The invention applies local quality by providing increased casing thickness specifically in the critical region below the connection box where explosion pressure is most severe. Other regions of the casing maintain standard thickness, allowing the machine to achieve necessary strength in critical areas without increasing overall volume.
3Reliability
If structural reinforcements and fixing walls are added to the connection box region, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The invention merges the reinforcement structure with the existing casing by integrating fixing walls and strengthening elements directly into the casing design. The base plate and fixing walls form an integrated structural unit that reinforces the connection box region without requiring separate, complex reinforcement components or assembly steps.
4Reliability
If permanent seals and reinforcements are used in the casing, then the reliability is improved, but the ease of repair decreases
Solution Approach 1:
The invention employs a removable base plate instead of permanent seals or welded connections. The base plate can be easily detached and reattached, allowing for simple maintenance, inspection, and repair operations. This dynamic, reversible connection maintains sealing reliability while dramatically improving ease of repair compared to permanent fixation methods.
Data Source
AI summary
An explosion-proof electrical machine and, more specifically, to an electrical machine comprising an internal pressure reduction device. The internal pressure reduction device comprises a base for installation in a region of the casing below the connection box, a base being configured to receive a plurality of volume filling pieces; wherein the base comprises a bottom part and a part of wall which is extended by at least a part of the periphery of the bottom part. The base may further comprise at least one engaging means for each piece of the plurality of volume filling pieces.