Graphite Foam Firearm Suppressor for Sustained-Fire Heat Dissipation

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Solution Overview

Problem

Conventional sound suppressors for machine guns face issues with heat buildup and damage during sustained firing, leading to visibility and frequent repair or replacement needs due to heat deformation and bullet impacts.

Innovation Solution

A disassemblable sound suppressor design incorporating a graphite foam heat transfer system to manage heat and reduce component damage, allowing for selective replacement of damaged parts and extended component lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If a sound suppressor is used for sustained firing, then the suppressor can effectively conceal the location of the firearm, but the suppressor becomes hot and visible on a dark night

Engineering Contradiction:
Improveheat signatureVSAvoidvisibility
Core Design Contradiction:
Object-generated harmful factorsVSIllumination intensity

Solution Approach 1:

The patent employs a graphite foam structure with porous characteristics that provides high surface area for heat dissipation. The foam's cellular structure allows efficient thermal radiation and convection, reducing the heat signature without increasing visibility, directly resolving the contradiction between heat management and concealment.

Inventive Principle:
Principle #31Porous materials

Solution Approach 2:

The patent changes the thermal parameters of the suppressor by incorporating graphite foam material with superior thermal conductivity and heat capacity. This parameter change allows the suppressor to manage heat more effectively during sustained firing, reducing the heat signature that causes visibility on dark nights.

Inventive Principle:
Principle #35Parameter changes

2Object-generated harmful factors

If a sound suppressor is used for sustained firing, then the suppressor can effectively conceal the location of the firearm, but the suppressor suffers from heat deformation and internal damage

Engineering Contradiction:
Improveheat buildupVSAvoidcomponent durability
Core Design Contradiction:
Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent uses a composite structure combining graphite foam with metallic components. The graphite foam acts as a thermal management material that protects the metallic baffles and housing from excessive heat, reducing thermal deformation and extending component life during sustained firing operations.

Inventive Principle:
Principle #40Composite materials

Solution Approach 2:

The patent converts the harmful heat generated during sustained firing into a beneficial effect by using graphite foam to absorb and distribute the thermal energy. The heat that would otherwise cause deformation and damage is now utilized to preheat the foam material, which then radiates heat more efficiently, protecting internal components.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

3Device complexity

If a sound suppressor is designed as a single integrated unit, then the structure is simpler, but the entire suppressor must be replaced when any component is damaged

Engineering Contradiction:
Improvestructural simplicityVSAvoidcomponent replacement
Core Design Contradiction:
Device complexityVSEase of repair

Solution Approach 1:

The patent divides the suppressor into distinct modular segments including a removable graphite foam insert, baffles, and housing. This segmentation allows the foam component to be replaced independently when damaged, while the metal housing and baffles can be reused, reducing overall replacement costs and improving ease of repair.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic configurability to the suppressor design, allowing the graphite foam component to be inserted or removed as needed. This dynamic element enables flexible maintenance where only the damaged foam insert needs replacement, while the permanent metal structure remains in service.

Inventive Principle:
Principle #15Dynamics

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 suppressor effectively reduces heat signature and deformation, prolongs component life, and minimizes the need for frequent replacements by efficiently dissipating heat and protecting against bullet impacts through modular design and advanced heat management.

Implementation Method 1

The present suppressor takes advantage of the heat transfer capabilities of graphite foam

Methodology Applied
Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

the foam reduce the heat signature of the firearm when undergoing sustained firing

Methodology Applied
Scientific EffectThermal radiation: Thermal Radiation

Data Source

PatentUS9175920B2Sound suppressor for a firearm
Publication Date: 2015.11.03 FN HERSTAL SA
  • US9175920B2 patent drawing
  • US9175920B2 patent drawing
  • US9175920B2 patent drawing

AI summary

A sound suppressor for a firearm with a high rate of fire, such as a machine gun, conceals the location of the firearm during heavy use by rapidly dissipating heat through a foamed carbon core. A sound suppressing baffle core is coaxially located within a tubular housing, having flared ends extending beyond the core. An inlet nozzle and exit place close the ends of the suppressor and are held in place with threaded collars. The terminal portions of the collars are beveled, as are the corresponding terminal portions of the nozzle and end plate, and are used to capture the flared portions of the ends of the tubular housing. Diagonally opposing recesses in the collars enable their removal with a spanner wrench, along with the other components for maintenance and replacement. The suppressor lasts longer and has a less visible heat signature used in sustained fire on a machine gun.