Liquid-Tight Conduit Fitting with Rotatable Grounding Ring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conduit fittings in wet or corrosive environments often fail to provide a reliable liquid-tight seal and secure grounding, making them inadequate for applications such as wastewater treatment, saltwater exposure, and petrochemical refining.
Innovation Solution
A liquid-tight conduit fitting with a resilient PVC coating and a rotatable grounding ring that engages with both the fitting body and gland nut, allowing for easy grounding wire connection and ensuring a secure, liquid-tight seal upon tightening, utilizing a compression bushing and resilient rims for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conduit fittings are used in wet or corrosive environments, then installation is simple, but they fail to provide reliable liquid-tight seal and secure grounding
Solution Approach 1:
The fitting is divided into distinct functional components: a fitting body with resilient coating for sealing, a grounding ring for electrical grounding, and a gland nut for compression and locking. Each component performs a specific function, allowing the system to achieve reliable liquid-tight sealing and secure grounding while maintaining manageable complexity through modular design.
Solution Approach 2:
The fitting body is coated with a resilient material (such as rubber or elastomer) that provides both sealing and corrosion resistance. This composite structure combines the mechanical strength of the metal fitting body with the protective and sealing properties of the resilient coating, enabling reliable performance in wet and corrosive environments.
2Reliability
If conventional conduit fittings are used in corrosive environments, then structure is simple, but they fail to provide secure grounding
Solution Approach 1:
A dedicated grounding ring is introduced as an intermediary component between the fitting body and the grounding connection point. This grounding ring provides a reliable electrical pathway and can be rotated to facilitate easy ground wire attachment, ensuring secure grounding without significantly complicating the overall fitting structure.
Solution Approach 2:
The grounding ring is designed to be rotatable relative to the fitting body, allowing installers to easily position and attach ground wires. This dynamic feature simplifies the grounding process while maintaining a secure, fixed connection once installed, thereby improving grounding reliability without adding excessive complexity.
3Reliability
If liquid-tight seal is ensured in wet environments, then sealing reliability improves, but installation difficulty increases
Solution Approach 1:
The resilient coating is pre-applied to the fitting body during manufacturing, and the grounding ring is pre-attached in a rotatable position. This preliminary preparation allows installers to simply tighten the gland nut to activate the sealing action without needing to apply sealants or perform complex sealing procedures, thereby ensuring reliable sealing while maintaining ease of installation.
Solution Approach 2:
The resilient coating changes its physical parameters (compression, expansion) in response to the tightening of the gland nut. As the gland nut is tightened, the coating compresses to form a liquid-tight seal between components. This automatic parameter change enables reliable sealing through a simple tightening action, improving both sealing reliability and installation ease.
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 provides a reliable liquid-tight seal and secure grounding in challenging environments, ensuring the integrity of electrical or communication cables while facilitating easier installation of ground wires.
Implementation Method 1
The coating on the fitting body engages one side of the grounding ring and the coating on the gland nut engages the opposing side of the grounding ring during assembly
Implementation Method 2
A liquid-tight conduit fitting with a resilient PVC coating
Data Source
AI summary
A fitting for terminating a conduit includes a substantially tubular fitting body having a central bore extending therethrough, a forward end, and a rearward end opposing the forward end. The fitting body includes a first liquid-proof coating that includes a rearward sealing rim. A gland nut is rotatably coupled to the rearward end of the fitting body. The gland nut includes a second liquid-proof coating that includes a forward sealing rim. A grounding ring is positioned between the gland nut and the fitting body and contacts the fitting body. Upon axial movement of the gland nut, the grounding ring engages the rearward sealing rim of the first liquid-proof coating on the fitting body and the forward sealing rim of the second liquid-proof coating on the gland nut to form a sealed relationship therewith.