Electrical Junction Box Thermal Management
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Solution Overview
Problem
Conventional electrical junction boxes do not effectively prevent condensation and freezing issues on relay contacts due to heat distribution and current supply variations among various electrical components, leading to potential malfunctions.
Innovation Solution
The electrical junction box design includes a casing with an inner and outer wall structure, featuring cutouts and ventilation holes to facilitate heat dissipation, and positions electrical components at the outer end or corners for efficient heat release, reducing temperature differences and condensation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrical components are housed in a conventional electrical junction box with uniform structure, then the box can accommodate various electrical components, but temperature distribution becomes uneven leading to condensation and freezing on relay contacts
Solution Approach 1:
The patent applies local quality by creating a temperature-controlled zone around the relay using thermal insulation material. This insulating barrier is selectively placed only where needed (around the relay and terminal) rather than uniformly throughout the entire junction box, allowing different regions to have different thermal characteristics. This resolves the contradiction by maintaining adaptability for various components while creating a localized thermally stable environment for the relay contacts.
2Reliability
If heat dissipation structures are added to the electrical junction box, then condensation and freezing can be prevented, but the device complexity increases
Solution Approach 1:
The patent employs the self-service principle by utilizing the relay's own coil as a heating element to prevent condensation. The coil, which already consumes electrical power for its operation, is positioned in proximity to the terminal and contact area. When energized, the coil generates heat that naturally warms the surrounding region, preventing moisture condensation and freezing without requiring additional heating components or complex thermal management systems.
Solution Approach 2:
The patent introduces thermal insulation material as an intermediary substance between the relay/terminal and the surrounding environment. This insulating material acts as a thermal mediator that traps and retains heat generated by the coil, directing it toward the contact area while blocking heat loss to the external environment. This simple intermediary element effectively prevents condensation and freezing without adding complex active heating or cooling systems.
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
This configuration effectively reduces the likelihood of condensation and freezing on relay contacts, ensuring reliable operation by maintaining optimal temperatures and preventing malfunctions in low-temperature environments.
Implementation Method 1
heat generated by the coil in the electrical component case
Implementation Method 2
moisture in the electrical component case can be actively condensed on the metal plate by heat generated by the coil
Implementation Method 3
the heat can be easily released from the electrical component case to the outside of the casing compared to a double-layered structure including the inner wall and the outer wall
Data Source
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AI summary
An electrical junction box 10 includes a casing 11 and a relay 20 housed in the casing 11. The relay 20 is located at an outer end in the casing 11. The relay 20 includes an electrical component case 20a and a terminal 20b. The terminal 20b is attached through the electrical component case 20a and includes a fixed contact FC and a movable contact MC located in the electrical component case 20.