Detachable Helmet Adsorption Filter With Dynamic Airflow Control

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Solution Overview

Problem

Existing safety helmets with integrated purification tanks protrude, limiting movement and visibility, and cause increased respiratory resistance during vigorous activity, while separate masks are inconvenient and inefficient.

Innovation Solution

A detachable adsorption filter structure with stacked filtration and shielding layers, integrated into a helmet without protrusion, and a slide unit to vary airflow paths, enhanced by a powered air purifying respirator (PAPR) for optimal filtration efficiency and reduced breathing resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the purification tank is coupled to the outside of the helmet in a protruding shape, then the gas adsorption capacity and particle filtration capacity are improved, but the movement of the face part and arm is limited and visibility is reduced

Engineering Contradiction:

Improvegas adsorption capacityVSAvoidmovement freedom

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The purification tank is embedded inside the helmet shell rather than protruding outward, nesting the filtration system within the existing helmet structure. This eliminates the protrusion that limited movement and visibility while maintaining the adsorption and filtration functions through internal integration of the purification tank, adsorption layer, and filtration layer.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of operation

If the purification tank is embedded inside the helmet, then the movement freedom and visibility are improved, but the air may be introduced into the respirator even during normal times causing unnecessary consumption of the purification tank

Engineering Contradiction:

Improvemovement freedomVSAvoidpurification tank consumption

Core Design Contradiction:

Ease of operationVSLoss of substance

Solution Approach 1:

The communication between the internal space and respirator is made dynamic through a movable partition that can open or close based on operational status. During normal times, the partition remains closed to prevent unnecessary air flow and consumption. During operation, the partition opens to allow filtered air to reach the respirator, thus preventing waste while maintaining freedom of movement.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system incorporates a communication mechanism that responds to operational status to control air flow. The movable partition acts as a feedback-controlled element that adjusts its position based on whether the system is in operation or normal state, ensuring that the purification tank is consumed only when necessary and not during normal times.

Inventive Principle:

Principle #23Feedback

3Use of energy by moving object

If the respiration volume increases during vigorous physical activity, then the oxygen demand is improved, but the respiratory resistance through the purification tank increases making it difficult to breathe smoothly

Engineering Contradiction:

Improveoxygen demandVSAvoidrespiratory resistance

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Inventive Principle:

Principle #23Feedback

4Reliability

If the adsorption layer and filtration layer are stacked in a multi-layer structure, then the gas adsorption capacity and particle filtration capacity are improved, but the volume of the purification tank increases

Engineering Contradiction:

Improveparticle filtration capacityVSAvoidpurification tank volume

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent arranges the adsorption layer and filtration layer in a stacked multi-layer structure within the internal space of the purification tank. This vertical stacking utilizes the height dimension of the embedded tank, allowing multiple functional layers to be compactly arranged without increasing the horizontal footprint or overall volume significantly, thus maintaining high filtration capacity within a compact form.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12589267B2Adsorption filter structure or purification module and helmet comprising the same

Publication Date: 2026.03.31 AGENCY FOR DEFENSE DEV

AI summary

An absorption filter structure with increased filter efficiency in an easily detachable form for optional use with a helmet structure. The absorption filter structure includes a filtration unit to pass external air through an internal space in a filtration direction. An absorption layer, a filtering layer and a shielding layer are stacked in the filtration unit. For filtering the external air, an external air vent, and an internal air vent are also provided. When combined with a helmet, the absorption filter structure is configured to be easily detachable from the helmet.