Heat-Shrink Wire Connector Sealing for High-Temperature Waterproofing
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Solution Overview
Problem
Existing heat shrinkable connecting components for insulated electrical wires face challenges in achieving excellent sealing ability and durability under high temperature environments, while also ensuring electrical insulation, mechanical protection, and waterproofing.
Innovation Solution
A heat shrinkable connecting component featuring a heat shrinkable tube with a melting point of 210° C. to 250° C. and sealing portions with a specific shear viscosity range, ensuring excellent sealing accuracy and durability under high temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heat shrinkable tubes with hot melt layers are used for waterproofing, then water stopping performance is improved, but sealing accuracy and durability under high temperature conditions deteriorate
Solution Approach 1:
The patent changes the key parameter of the sealing material from conventional hot melt adhesive to a material with specific shear viscosity characteristics: 1000-2000 Pa·s at 250°C (high temperature) and 7000-70000 Pa·s at 215°C (room temperature). This parameter change enables the material to maintain appropriate fluidity during heating for complete gap filling while providing sufficient viscosity at room temperature for accurate positioning and preventing leakage, thereby resolving the contradiction between waterproofing performance and sealing accuracy.
2Strength
If heat shrinkable tubes are heated to shrink and adhere to connection portions, then mechanical protection and electrical insulation are improved, but durability under high temperature environments deteriorates
Solution Approach 1:
The patent selects a heat shrinkable tube material with a melting point of 210-250°C, which is higher than conventional materials. This parameter change allows the tube to withstand higher processing temperatures and maintain structural integrity and mechanical protection properties in high temperature environments, resolving the contradiction between mechanical protection strength and high temperature durability.
3Reliability
If sealing material with high fluidity is used to fill gaps, then waterproofing is improved, but sealing accuracy deteriorates due to material leakage
Solution Approach 1:
The patent employs a sealing material whose viscosity dynamically changes with temperature: at high temperature (250°C) during the heating process, the material has low viscosity (1000-2000 Pa·s) for high fluidity to completely fill gaps; at room temperature (215°C) after cooling, the viscosity increases significantly (7000-70000 Pa·s) to prevent leakage and maintain sealing accuracy. This dynamic viscosity adjustment resolves the contradiction between waterproofing and sealing accuracy.
Solution Approach 2:
The patent utilizes the phase transition behavior of the sealing material between molten and solidified states. During heating, the material transitions to a low-viscosity molten state that flows easily to fill all gaps; upon cooling, it transitions to a high-viscosity solidified state that maintains its position and prevents leakage. This phase transition mechanism enables both complete gap filling for waterproofing and positional stability for sealing accuracy.
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 proposed solution provides a heat shrinkable connecting component with enhanced sealing ability and durability under high temperature environments, effectively protecting the connection portions of insulated electrical wires while maintaining insulation and preventing water intrusion.
Implementation Method 1
the heat shrinkable tube shrinks and adheres closely to the shape of the connection portion due to the shape memory effect
Implementation Method 2
A sealing material of each of the sealing portions has shear viscosity of 1000 Pa·s to 2000 Pa·s at 250° C. with a shear rate of 100/s and has shear viscosity of 7000 Pa·s to 70000 Pa·s at 215° C. with a shear rate of 0.01/s
Data Source
AI summary
A heat shrinkable connection component according to one embodiment of the present disclosure is used for the purpose of connecting an insulated wire that is obtained by covering a conductor with an insulating layer. This heat shrinkable connection component is provided with a heat shrinkable tube that has a melting point of 210° C. to 250° C. and a pair of sealing parts that are arranged on the inner circumferential surfaces of both end parts of the heat shrinkable tube; and the sealing material of the sealing parts has a shear viscosity of 1,000 Pa·s to 2,000 Pa·s at a shear rate of 100/s at 250° C., and a shear viscosity of 7,000 Pa·s to 70,000 Pa·s at a shear rate of 0.01/s at 215° C.