Nut Seal Assembly for Coaxial Cable Moisture Protection
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Solution Overview
Problem
Coaxial cable connections in outdoor and exposed environments are prone to corrosion and contamination, leading to reduced signal quality and high maintenance costs due to existing sealing methods requiring skill, patience, and specific conditions for effective application.
Innovation Solution
A nut seal assembly with a bellows-type elastomer seal that forms an integrated assembly with a nut component, featuring a threaded interior surface and a seal-grasping surface for secure engagement, providing a reliable seal against moisture and contaminants through axial compression, suitable for various port lengths and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sealing methods (electrical tape, shrink wrap, rubber grommets) are used, then moisture and corrosion resistance is improved, but operator skill and attention to detail are required, and application complexity increases
Solution Approach 1:
The seal is integrated directly into the connector housing as a built-in component, eliminating the need for separate sealing operations. The seal forms an integral part of the connector assembly, automatically providing protection when the connector is installed, without requiring operators to separately apply tape, shrink wrap, or install separate grommets.
Solution Approach 2:
The connector provides its own sealing function through the integrated seal that is automatically positioned and compressed during the normal connection process. The seal self-activates when the connector is installed on the port, requiring no additional operator actions or special skills beyond the basic connection procedure.
2Reliability
If rubber grommets are used for sealing, then moisture resistance is improved, but the seal must be tight enough to collapse onto mating parts, causing high friction that may lead operators to believe the connection is tightened when it remains loose
Solution Approach 1:
The seal is combined with the connector structure itself, forming an integrated assembly where the seal, connector body, and compression mechanism work together as a unified system. This eliminates the separate grommet installation step and provides more predictable sealing behavior.
Solution Approach 2:
The seal design changes the compression parameters by using the connector's structural geometry to apply controlled radial compression. The seal is compressed between the connector body and the port surface, providing consistent sealing pressure that does not create excessive friction on the threading, allowing operators to properly tighten connections.
3Reliability
If axial compression seals are used between connector nut and port surface, then sealing is achieved, but the seal length must be precisely selected to span the distance without being too long or too short, complicating the selection process due to varying port lengths
Solution Approach 1:
The connector design incorporates a universal sealing mechanism that works with ports of varying lengths through the integrated seal structure. The seal is positioned and compressed by the connector's own geometry, allowing the same connector design to effectively seal different port configurations without requiring different seal lengths or special selection procedures.
Solution Approach 2:
The seal compression parameters are determined by the connector's structural design rather than by selecting different seal lengths. The integrated seal is compressed between fixed surfaces of the connector body and port, automatically adapting to different port lengths while maintaining effective sealing through controlled compression.
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 seal assembly effectively prevents moisture and contaminant ingress, ensuring consistent signal quality and reducing maintenance costs by simplifying the sealing process and accommodating different port dimensions and configurations.
Implementation Method 1
a bellows-type elastomer seal having an elastically deformable tubular body
Implementation Method 2
providing a reliable seal against moisture and contaminants through axial compression
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
An integrated seal assembly and a coaxial cable system component incorporating the seal assembly (60) with a connector for coupling to an externally threaded port. The seal assembly includes a bellows-type seal having an elastically deformable tubular body and a plurality of sealing surfaces, and an integral joint-section (65) intermediate an anterior end and a posterior end (59) that assists in the axial deformation of the seal in response to axially-directed force. One of the sealing surfaces is made to engage a corresponding surface of an internally threaded nut (40) or housing. The component is engagable with an externally threaded port via the internally threaded connector. The anterior end (68) of the seal fits over the port and a sealing surface of the seal is capable of sealing axially against a shoulder of the port while the seal body covers the otherwise exposed externally threaded port.