Explosion Proof Feedthrough Connector Sealing Mechanism
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Solution Overview
Problem
Existing explosion proof connectors and systems face challenges in preventing hazardous conditions like sparks and flames from passing through, especially when extending connections between points inside and outside explosion proof compartments, and in managing sensor malfunctions in explosive environments.
Innovation Solution
A feedthrough connector design featuring a cylindrical retaining ring, cone-shaped wedge, and rubber grommet provides a tight seal to inhibit hazardous conditions, along with encapsulating sensors in explosion proof enclosures to prevent sparking, and using strategically placed explosion proof components and connectors to reduce hazardous conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cylindrical feedthrough connector is used to extend electrical connections through the explosion proof compartment wall, then the connection between internal and external terminals is achieved, but the assembly difficulty increases and the sealing integrity may be compromised
Solution Approach 1:
The connector is divided into multiple separable components including a cable gland body, sealing elements, and mounting flanges that can be assembled in sections and then joined together, making assembly easier while maintaining sealing integrity through designed mating surfaces and gaskets
Solution Approach 2:
Sealing elements and gaskets are pre-installed on mating surfaces before final assembly, ensuring that sealing integrity is established in advance before the connector components are joined together, preventing contamination and ensuring proper sealing from the start
2Reliability
If known feedthrough connectors are used to pass cables through the explosion proof compartment, then electrical connections are extended, but hazardous conditions such as sparks can still pass through the connector
Solution Approach 1:
The connector employs nested metallic sleeves and concentric sealing chambers where one component is placed inside another, creating multiple barriers that prevent sparks and hazardous conditions from passing through while maintaining a relatively simple external structure
Solution Approach 2:
The connector uses composite construction combining metallic components for structural strength and spark containment with non-metallic sealing materials and insulating elements, creating a multi-material structure that inhibits hazard transmission without excessive complexity
3Adaptability or versatility
If numerous sensors are installed within and between explosion proof compartments, then monitoring capability is improved, but the risk of sensor malfunction generating hazardous conditions increases
Solution Approach 1:
Sensors are extracted from the explosive atmosphere environment and mounted in safe locations outside the explosion proof compartments, with their signal cables routed through the sealed connectors, eliminating them as potential spark sources while maintaining monitoring capability
Solution Approach 2:
The sealed connector acts as an intermediary element that transmits sensor signals from safe external locations into the explosion proof compartments without allowing electrical arcs or sparks to pass through, mediating between the sensor and the monitored environment
4Reliability
If explosion proof components are strategically placed and interconnected, then hazardous condition generation is reduced, but the complexity of routing and connecting interconnections increases
Solution Approach 1:
The connector design incorporates universal mounting flanges, standardized threading, and multiple cable entry points that can accommodate different sensor types and cable configurations, allowing the same connector to serve multiple functions and reducing overall system complexity
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 enhances the integrity of the seal, simplifies assembly and disassembly, and effectively prevents the passage of sparks and flames, making the system more reliable and safer for use in explosive environments.
Implementation Method 1
a cylindrical rubber grommet (providing thermal and electrical isolation) located between the bottom end of the sealing tube and the base nut
Implementation Method 2
a cylindrical rubber grommet (providing thermal and electrical isolation) located between the bottom end of the sealing tube and the base nut
Implementation Method 3
a cone shaped wedge component and a cylindrical rubber grommet located between the bottom end of the sealing tube and the base nut which can be rotated to produce a tight fit among the components
Data Source
Figure 1
Figure 1A
Figure 1B
AI summary
Explosion proof enclosures and explosion proof connectors (11) and sensors are used to render a machine, intended to be operated in an explosive environment, explosion proof. An explosion proof connector includes an intermediate section (8) having an input portion to receive a cable (1) from a terminal external to an explosion proof enclosure and an output portion for passing the cable for connection to a terminal within an explosion proof enclosure. A sealing tube (7) which extends between the input and output portions has a central opening for enabling a cable to be passed through. A sealant may be injected into the sealing tube to form an air tight connection between the cable and the inner walls of the sealing tube which inhibits a hazardous condition from passing through and around the sealing tube. An explosion proof sensor includes potting and encasing the sensor in its own explosion proof case.