Sealing System for Top Drive Motor Junction Box
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Solution Overview
Problem
In harsh weather environments, top drive motors used in drilling operations face water ingress through wires, cables, and conduits penetrating a junction box, leading to potential damage and electrical hazards due to the lack of a reliable water-tight seal.
Innovation Solution
A sealing system comprising a clamping member and a sealing member with apertures and interface surfaces, where the clamping member compresses the sealing member to create a water-tight seal around flexible longitudinal members like wires, tubes, and conduits, using non-magnetic materials and sleeves to prevent radial loading and ensure a secure fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wires, cables, and conduits are used to penetrate the junction box wall for electrical connections, then electrical functionality is achieved, but water ingress paths are created leading to potential damage and electrical hazards
Solution Approach 1:
The sealing system divides the penetration area into multiple segments: individual apertures for each wire/cable/conduit, separate sealing members for each aperture, and modular clamping members. This segmentation allows each component to be optimized for its specific function while collectively providing comprehensive sealing coverage around all penetrating elements.
Solution Approach 2:
The sealing member acts as an intermediary element between the penetrating wires/cables/conduits and the junction box wall. It provides a water-tight barrier that mediates between the need for electrical connectivity through penetrations and the requirement to prevent water ingress, effectively blocking water while allowing electrical components to pass through.
2Reliability
If a tight seal is created around penetrating members to prevent water ingress, then water-tight protection is achieved, but radial loading on the flexible longitudinal members increases which may damage them
Solution Approach 1:
The sealing member provides localized sealing quality at the interface between the clamping member and penetrating members, rather than requiring uniform compression throughout. The apertures in the sealing member are positioned to contact only the outer surface of wires/cables/conduits where sealing is needed, while the non-magnetic metal clamping member distributes the clamping force to prevent excessive radial loading on the flexible members.
Solution Approach 2:
The system uses composite construction with a non-magnetic metal clamping member providing structural strength and force distribution, combined with a sealing member (potentially elastomeric or gasket material) that provides compliant sealing contact. This composite approach allows the rigid component to maintain seal pressure while the flexible component accommodates the soft contact needed to protect delicate penetrating members.
3Reliability
If multiple wires, cables, and conduits are sealed individually, then comprehensive water protection is achieved, but device complexity increases
Solution Approach 1:
The clamping member serves multiple functions simultaneously: it provides the clamping force to compress the sealing member, distributes the load across multiple penetrating members, provides structural support, and prevents radial loading on the flexible members. This multi-functionality reduces the need for separate components for each function, simplifying the overall system despite sealing multiple penetrations.
Solution Approach 2:
The system merges the clamping function and sealing function into a single integrated assembly where the clamping member and sealing member work together as a unified sealing system. Rather than using separate clamps and seals for each wire/cable/conduit, the apertures in the sealing member align with corresponding openings in the clamping member to create a combined sealing and clamping solution that reduces component count and assembly 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 system effectively prevents water ingress into the junction box, protecting electrical components and preventing electrical shocks by creating a reliable water-tight seal around penetrating wires, cables, and conduits, ensuring the integrity of the top drive motor's electrical components.
Implementation Method 1
each aperture of the first set of apertures in the sealing member is configured to circumferentially contract around the at least one flexible longitudinal member when the clamping member is drawn into engagement with the sealing member by the fastener
Data Source
AI summary
A system configured to seal at least one flexible longitudinal member is provided. In one embodiment, the system includes a sealing member having at first set of apertures, a second set of apertures, and inner and outer interface surfaces. The system also includes a clamping member having a first set of apertures and an interface surface. The first set of apertures in the clamping member is configured to align with the first set of apertures in the sealing member. The first sets of apertures are configured to receive the at least one flexible longitudinal member. The interface surface of the clamping member is configured to abut the inner interface surface of the sealing member. The system also includes at least one threaded blind bore in the interface surface of the clamping member, and at least one fastener configured to draw the clamping member into engagement with the sealing member.