Explosion-Proof Motor Conduit Sealing via Adapter Plate
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Solution Overview
Problem
Existing methods for isolating conduit enclosures in explosion-proof motors are costly and time-consuming due to the need for applying sealing compounds over large areas, which can lead to errors and render the motor stator unusable.
Innovation Solution
A system where sealing compound is injected into entry ports of a conduit enclosure, rather than within the motor stator, using insulating paper and structural features to support the compound and ensure a reliable explosion-resistant seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing compound is applied within the motor stator using slow-curing compounds poured into molds, then the electrical lead pathways are sealed to contain explosions, but the manufacturing cost and time increase due to large application area and potential errors rendering the entire stator unusable
Solution Approach 1:
The invention divides the sealing system into two separate components: the motor stator and the conduit enclosure. The sealing compound is applied only within the conduit enclosure entry ports rather than throughout the entire motor stator, segmenting the sealing function to reduce manufacturing complexity and cost while maintaining explosion containment reliability.
Solution Approach 2:
The sealing function is extracted from the motor stator and relocated to the conduit enclosure. By removing the sealing compound application from the stator assembly process and concentrating it in the conduit enclosure entry ports, the invention simplifies stator manufacturing while achieving the same explosion containment effect.
2Reliability
If sealing compound is applied over large areas within the motor stator, then complete coverage is achieved to prevent explosion propagation, but the time and cost to manufacture increase
Solution Approach 1:
The invention applies sealing compound locally only at the conduit enclosure entry ports where electrical leads pass through, rather than applying it over the large area of the entire motor stator. This localized approach maintains sealing completeness at the critical pathways while significantly reducing manufacturing time and material usage.
3Reliability
If slow-curing sealing compounds are used to ensure proper sealing, then reliable explosion containment is achieved, but the manufacturing time increases due to extended curing requirements
Solution Approach 1:
The invention uses a pre-formed grommet as a temporary, disposable sealing element during assembly. This grommet provides immediate sealing function without requiring slow-curing compounds, allowing for faster assembly while maintaining seal integrity. The grommet serves its purpose during the critical sealing phase and can be replaced or is designed for single-use in the manufacturing process.
Data Source
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AI summary
An enclosure system includes a stator enclosure defining an enclosure opening, and an adapter (510) having a first entry port (520), and defines a center cavity (516) having a first volume. Enclosure system includes a conduit enclosure (550) coupled to one or more of stator enclosure and adapter (510). Conduit enclosure (550) includes a base member (552) having at least one side wall (554), a rear wall (556) coupled to side wall (554) and defining a second entry port (560), an interior cavity (558), and a terminal connection block coupled to base member (552) and having at least one terminal. Enclosure system includes at least one electrical lead extending from the stator enclosure through first enclosure opening, through first entry port (520), through center cavity (516), through second entry port (560), and into the interior cavity (558). Electrical lead occupies a portion of first volume and leaves a remaining volume. Enclosure system includes sealing compound coupled with adapter (510) such that substantially all of remaining volume is occupied.