Sealed Indicator Display Module for Harsh Environments
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Solution Overview
Problem
Power equipment display units, such as those in lawn and garden tractors, frequently fail due to exposure to harsh environmental conditions like moisture and dust, leading to increased warranty costs and shortened product life cycles.
Innovation Solution
An indicator display module with a hermetically sealed housing and seal that includes a desiccant pill, providing a sealed cavity around the electrical components to protect them from contaminants, using a silicone seal with compression-fit connections and a recess for the desiccant pill.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If display units are positioned on the dash panel for operator visibility, then ease of operation is improved, but reliability deteriorates due to exposure to harsh environmental conditions
Solution Approach 1:
The display unit is segmented into a sealed housing containing electronic components, separated from the external environment. The housing creates an isolated compartment that protects sensitive electronics while allowing the display face to remain accessible for operator viewing.
Solution Approach 2:
A sealed housing acts as an intermediary barrier between the electronic components and harsh environmental conditions. This protective enclosure mediates the interaction between the vulnerable electronics and external contaminants like moisture, dust, and oil.
2Ease of manufacture
If electrical components are exposed for functionality, then ease of manufacture is improved, but object-affected harmful factors worsen due to moisture and dust ingress
Solution Approach 1:
Electronic components are assembled and sealed within the housing before final installation. The sealing action is performed preliminarily during assembly, creating a protected environment before the components are exposed to harsh conditions during operation.
Solution Approach 2:
A seal member, likely made of flexible elastomeric material, is used to create the sealing barrier. This flexible seal can conform to the housing contours and maintain effective sealing against moisture and dust ingress.
3Reliability
If a sealed cavity is created around electrical components, then reliability is improved by preventing contaminant ingress, but device complexity increases due to additional sealing components
Solution Approach 1:
The sealing function is merged with the housing structure itself. The seal member is integrated into the housing design, combining the protective enclosure and sealing functions into a unified component rather than adding separate sealing elements.
Solution Approach 2:
The seal member serves multiple functions simultaneously: it seals the cavity against contaminants, provides structural support for the display face attachment, and may accommodate misalignment between mating surfaces. This multi-functionality reduces the need for additional specialized components.
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 moisture and debris from entering the module, extending the product life cycle and reducing failure rates of the display units by maintaining internal conditions within the sealed cavity.
Implementation Method 1
A seal is positioned within the housing, forming a hermetically sealed cavity around the electrical components stored within the housing
Implementation Method 2
The seal includes a recess for supporting a desiccant pill positioned therein
Data Source
AI summary
An indicator display module includes a display face for informing an operator of a monitored condition and a housing having first and second ends. The display face is attached to the first end. The housing provides support to electrical components located within the housing. A cover is fixedly attached to the housing and engages the second end of the housing. A seal is positioned within the housing, forming a sealed cavity around the electrical components stored within the housing.