Protective Hood Channel Prevents Gas Backflow
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Solution Overview
Problem
Existing protective hoods face challenges with costly outlets and contamination issues due to ambient gas leakage through outlet openings, leading to discomfort and reduced effectiveness in hazardous environments.
Innovation Solution
A protective hood design featuring a channel between inner and outer bibs for gas exhaust, which prevents contaminated ambient gas from entering the interior space by utilizing a channel defined between the inner and outer bibs, ensuring effective gas expulsion without creating overpressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric flapper valves are used as outlets, then gas can be expelled without creating overpressure, but the cost of the protective hood increases due to extra raw material and installation labor
Solution Approach 1:
The patent replaces expensive elastomeric flapper valves with simple hole openings that are easier and cheaper to manufacture. The holes are positioned and sized to achieve the desired gas flow characteristics without requiring complex valve mechanisms, thereby reducing material and labor costs while maintaining functional effectiveness.
Solution Approach 2:
The patent extracts the essential function of gas expulsion from the complex elastomeric flapper valve mechanism and implements it through simple holes in the protective hood. This simplification removes unnecessary complexity while retaining the core functionality of allowing gas to escape without creating overpressure.
2Ease of manufacture
If holes are provided in the protective head covering for gas expulsion, then manufacturing cost is reduced, but contaminated ambient gas may leak into the interior space during movement and inhalation
Solution Approach 1:
The patent introduces a collar structure as an intermediary element between the interior space and the external environment. The collar includes openings that are positioned and sized to control gas flow, allowing exhaust gas to escape while preventing contaminated ambient gas from entering the interior space during wearer movement and inhalation.
Solution Approach 2:
The patent applies different qualities to different parts of the outlet structure. The collar openings are specifically positioned and sized to create a flow pattern that directs exhaust gas away from the interior space while preventing backflow of contaminated air. This localized design optimization addresses the contamination issue without requiring complex valve mechanisms throughout the entire structure.
3Object-affected harmful factors
If a neck seal assembly is used to seal the protective hood, then protection is improved, but gas flow out of the interior space is restricted causing overpressure and wearer discomfort
Solution Approach 1:
The patent segments the outlet function from the seal function by using a collar structure with specifically designed openings. This segmentation allows the neck seal assembly to maintain protection effectiveness while the collar openings provide a dedicated pathway for gas flow that prevents overpressure buildup in the interior space.
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 a cost-effective outlet system that prevents contaminated ambient gas from entering the hood, maintaining a safe internal environment and reducing wearer discomfort by effectively managing gas flow and pressure.
Implementation Method 1
The channel is in fluid communication with the interior space and includes an open end portion in fluid communication with the environment for exhausting gas from the channel into the environment
Data Source
AI summary
A protective hood is provided for protecting a wearer's head from environmental elements. The protective hood includes a hood body having a cap section positioned to fit over a top of the wearer's head, side sections positioned to hang adjacent sides of the wearer's head, and a back section positioned to hang adjacent a back of the wearer's head. The hood body defines an interior space for receiving the wearer's head. An outlet is provided for exhausting gas from the interior space of the hood body. The outlet includes a channel defined by first and second portions of the hood body. The channel is in fluid communication with the interior space and includes an open end portion in fluid communication with the environment for exhausting gas from the channel into the environment.