Cold Shrinkable Terminal Separating Layer
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Solution Overview
Problem
Existing cold shrinkable terminal assemblies face issues with physical property degradation and cracking due to the use of silicone rubber materials, where the terminal body and stress control clay share the same base material, leading to swelling and reduced performance during expansion.
Innovation Solution
A cold shrinkable terminal assembly featuring a composite void filling mastic with a separating layer made of rubber-based hydrocarbon materials, such as ethylene propylene diene monomer, thermoplastic ethylene propylene rubber, polyisobutylene, or polyisoprene, which prevents direct contact between the filling layer and the terminal body, thereby maintaining physical integrity and preventing cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the terminal body and stress control clay both use silicone rubber base material, then the material compatibility and bonding are improved, but the physical properties deteriorate and cracking occurs due to mutual swelling during large expansion
Solution Approach 1:
A separating layer made of rubber-based hydrocarbon material is introduced between the silicone rubber terminal body and the silicone rubber-filled void. This intermediary layer prevents direct contact between the two silicone rubber components, eliminating the harmful swelling interaction while maintaining the benefits of silicone rubber material properties in both components.
2Ease of operation
If the terminal body undergoes large expansion during cold shrinkage, then the fitting tightness is improved, but the physical properties of the terminal body are reduced and cracking occurs
Solution Approach 1:
The separating layer is pre-installed in the void before the terminal body undergoes cold shrinkage expansion. This layer acts as a cushioning barrier that prevents the expanding terminal body from directly interacting with the silicone rubber filling, thereby protecting the terminal body from physical property degradation and cracking during the expansion process.
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 effectively prevents physical property reduction and cracking of the terminal body by using a separating layer of different material, ensuring improved durability and performance by avoiding swelling and maintaining the terminal's structural integrity.
Implementation Method 1
a cold shrinkable terminal body (110) shrunk on the cable joint (200) of the cable
Implementation Method 2
a separating layer (302) covered on the filling layer (301) and made of material different from the terminal body (110)... prevents direct contact between the filling layer and the terminal body, thereby maintaining physical integrity and preventing cracking
Data Source
Figure 1~1B
Figure 2
Figure 3~4
AI summary
A cold shrinkable terminal assembly includes: a cold shrinkable cable terminal including a terminal body configured to be fixed to a cable joint; and a support tube, the terminal body being pre-expanded on the support tube on which a composite void filling mastic is preset. The composite void filling mastic at least covers an incision of the exposed conductive shielding layer after the cold shrinkable terminal is fixed to the cable joint. The composite void filling mastic includes a filling layer in contact with an outer wall of the support tube; and a separating layer located between the filling layer and the terminal body and made of material different from the terminal body. Since the composite void filling mastic comprises the separating layer made of material different from the terminal body, it avoids the filling layer to directly contact the terminal body made of silicone rubber material, effectively preventing the physical properties of the terminal body from being reduced due to the swelling of the terminal body caused by the filling layer, and eliminating the risk of the cracking of the terminal body.