Downlight Grounding Assembly With Leaf Springs and Heat Dissipation
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Solution Overview
Problem
Existing downlight devices lack adequate safety measures for grounding, posing a risk of electric shock, especially when the light housing is made of metal and has an electric insulation layer.
Innovation Solution
The downlight apparatus incorporates multiple leaf springs, shaft connectors, and pads with pad scrapers to remove portions of the electric insulation layer on the light holder, ensuring electrical connection to ground, and includes a heat dissipation plate to manage heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the light housing is made of metal with electric insulation layer, then the structural strength and durability are improved, but the risk of electric shock increases due to inadequate grounding
Solution Approach 1:
The patent introduces a grounding contact as an intermediary element between the metal light housing and the ground. This grounding contact makes electrical connection with the inner circumferential surface of the light housing and extends to the ground, serving as a mediator that safely conducts electricity to ground while isolating users from direct contact with live parts.
Solution Approach 2:
The grounding mechanism is designed to automatically establish electrical connection through the grounding contact when the light housing is assembled. The spring-loaded grounding contact self-activates upon assembly, ensuring grounding is established without requiring manual intervention or additional safety checks.
2Reliability
If the pad scraper removes electric insulation layer, then the electrical connection to ground is improved, but the manufacturing complexity increases
Solution Approach 1:
The pad scraper is pre-positioned on the grounding contact before assembly. During the assembly process, the pad scraper automatically contacts and scrapes the electric insulation layer from the light housing inner circumferential surface, preparing the grounding interface in advance before final electrical connection is made.
Solution Approach 2:
The grounding contact combines multiple functions into a single component: it provides the grounding path, includes the pad scraper for insulation removal, and integrates the spring mechanism for automatic activation. This merging reduces the number of separate parts and simplifies the overall assembly process.
3Temperature
If the heat dissipation plate is added, then the heat management performance is improved, but the device complexity increases
Solution Approach 1:
The heat dissipation plate is designed to serve multiple functions simultaneously: it dissipates heat from the LED light source, provides a mounting surface for the grounding contact, and acts as a structural support element. This multi-functionality reduces the need for separate components and minimizes overall device complexity.
Solution Approach 2:
The heat dissipation plate is integrated with the grounding contact assembly, combining thermal management and electrical grounding functions into a unified structure. The plate serves as both a thermal conduit and a mechanical support for the grounding mechanism.
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 provides enhanced safety by grounding the light housing, reducing the risk of electric shock and effectively dissipating heat, thereby improving user safety and device performance.
Implementation Method 1
a heat dissipation plate to manage heat
Implementation Method 2
multiple leaf springs
Data Source
AI summary
A downlight apparatus includes a driver box, a light source, a light housing with a light holder and a rim, leaf springs with spring holes, a heat dissipation plate provided between the light holder and the driver box, shaft connectors passing through the spring holes, and pads having a pad scraper surrounding a pad hole. The light holder has a holder plate and a holder wall defining a holder cavity. The leaf springs are placed between the driver box and the light holder. The heat dissipation plate has a portion not covered by the light holder and the driver box.