Backflow Assembly Vane Design for Enclosure Venting
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Solution Overview
Problem
Electronic equipment enclosures face challenges in preventing the ingress of unwanted materials such as dust, salt, mist, and snow through vent openings, which can damage the internal components despite existing solutions like filtered fan apparatus and deformation-based isolation systems.
Innovation Solution
The implementation of a backflow assembly with non-moving vanes arranged in a unique pattern between vent openings and fans to disrupt and divert airflow, reducing the momentum of unwanted materials and causing them to fall out before reaching the internal components, while allowing air to flow freely in and out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If vent openings are provided to allow air flow into the enclosure for cooling, then heat dissipation is improved, but unwanted materials such as dust, salt, mist, and snow can penetrate into the enclosure and damage electronic components
Solution Approach 1:
The vent opening is segmented into multiple pathways by providing a plurality of vanes that extend across the vent opening. These vanes divide the single large opening into multiple smaller channels, allowing air to pass through while creating tortuous paths that prevent unwanted materials from penetrating directly into the enclosure. The segmentation of the airflow path maintains cooling effectiveness while blocking harmful particles.
Solution Approach 2:
The vanes act as an intermediary element positioned between the external environment and the internal enclosure space. This intermediate structure intercepts unwanted materials (dust, salt, mist, snow) in the airflow, preventing them from reaching the electronic components while still allowing air to pass through the vent opening for thermal management.
2Object-affected harmful factors
If filters are used to block unwanted materials from entering through vent openings, then protection of internal components is improved, but device complexity and maintenance needs increase
Solution Approach 1:
The filtration function is extracted from the traditional filter medium and replaced by the geometric configuration of the vanes. Instead of using a filter material that requires replacement and maintenance, the protective function is achieved through the physical arrangement of solid vanes that create tortuous airflow paths, eliminating the need for consumable filter elements.
Solution Approach 2:
The vane structure provides self-sustaining protection without requiring external maintenance or replacement. The geometric configuration of the vanes continuously performs the filtration function passively as air flows through the enclosure, with no moving parts or consumable materials that would require service intervention.
3Object-affected harmful factors
If deformation-based isolation assemblies are used to block vent openings, then protection against unwanted materials is improved, but device complexity and potential failure points increase
Solution Approach 1:
Instead of using a movable blocking element that deforms to open/close the vent opening, the invention inverts the approach by using fixed vanes that create tortuous paths. The protection mechanism is inverted from active blocking to passive routing, where the airflow must navigate around the vanes rather than being directly blocked or opened by a moving assembly.
Solution Approach 2:
The fixed vane structure provides continuous protection without requiring actuation, deformation, or movement. The system serves itself by maintaining a constant geometric configuration that passively deflects unwanted materials while allowing air flow, with no moving parts that could fail or require maintenance.
4Object-affected harmful factors
If multiple vanes are arranged to block straight path airflow, then prevention of unwanted material ingress is improved, but air flow resistance increases
Solution Approach 1:
The vanes are arranged to block the straight-line (one-dimensional) path of airflow, forcing air to move in three-dimensional tortuous paths around and between the vanes. By changing the flow dimensionality from direct linear movement to multi-directional routing, the system blocks harmful particles that travel in straight lines while still allowing air to reach the enclosure through alternative pathways.
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 inhibits the entry of unwanted materials into the enclosures without requiring filters or complex moving parts, ensuring protection for the electronic equipment and reducing maintenance needs.
Implementation Method 1
disrupt and divert airflow, reducing the momentum of unwanted materials and causing them to fall out before reaching the internal components
Implementation Method 2
reducing the momentum of unwanted materials and causing them to fall out before reaching the internal components
Data Source
Figure 1
Figure 1
Figure 2
AI summary
Electronic equipment enclosures of the present disclosure are configured to house electronic equipment. The enclosures generally include vent opening configured to allow air to flow into and out of the enclosures, and fans configured to circulate the air within the enclosures around the electronic equipment housed therein. The enclosures also include backflow assemblies located between the vent openings and the fans, and configured to inhibit movement of unwanted materials through the enclosures between the vent openings and the fans. In addition, the backflow assemblies may include multiple vanes disposed adjacent the vent openings and arranged to block straight paths from the vent openings into the enclosures past the multiple vanes. The multiple vanes may be operable both to inhibit the movement of the unwanted materials through the enclosures and to allow air to flow out of the vent openings from the enclosures without moving.