Suppressor Baffle Stack With Gas Cross-Flow for Low Back Pressure

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Solution Overview

Problem

Firearms, particularly machine guns and semi-automatic rifles, face challenges in reducing both audible and visible signatures while maintaining shooting performance, with suppressors often causing back pressure and gas flow issues that can be hazardous to operators.

Innovation Solution

A suppressor design featuring a baffle stack with inner and outer volumes, vanes, and conduits that promote sinuous gas flow paths, reducing back pressure and directing gases through a tortuous path to minimize audible and visible signatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a suppressor is used to reduce audible and visible signatures, then the firearm's signature is reduced, but back pressure and gas flow issues increase causing hazardous conditions

Engineering Contradiction:

Improveaudible and visible signatureVSAvoidback pressure and gas flow issues

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The suppressor is divided into multiple chambers (first chamber, second chamber, third chamber) separated by baffles, with each chamber handling gas flow independently. This segmentation allows controlled gas expansion and direction in each stage, reducing overall back pressure while maintaining signature suppression

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Baffles serve as intermediary structures between chambers, featuring openings that direct gas flow from one chamber to the next. The baffles mediate the transition of high-pressure gases through controlled pathways, reducing chaotic back flow while maintaining pressure differential for effective suppression

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If gas flow is restricted to reduce audible signature, then sound attenuation improves, but back pressure increases creating hazardous conditions

Engineering Contradiction:

Improveaudible signatureVSAvoidback pressure

Core Design Contradiction:

Object-affected harmful factorsVSStress or pressure

Solution Approach 1:

The gas flow path is segmented into multiple chambers with progressive restriction. Each baffle provides a controlled opening that attenuates sound incrementally rather than creating a single severe restriction point, distributing pressure management across multiple stages

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Gas flow is directed from linear axial movement into radial expansion dimensions through the baffles. The openings in baffles redirect gases laterally into the next chamber, converting one-dimensional high-velocity flow into multi-dimensional expansion, reducing back pressure while maintaining attenuation

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of manufacture

If suppressor design is simplified, then manufacturing ease improves, but gas flow control and safety performance deteriorate

Engineering Contradiction:

Improvesuppressor design simplicityVSAvoidgas flow control and safety

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The suppressor is designed as modular chambers that can be manufactured separately and assembled. Each chamber-baffle assembly can be produced using standard machining processes, with the modular approach balancing manufacturing simplicity against the need for complex gas flow control

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different chambers have specialized local features optimized for their specific functions. The first chamber handles initial gas expansion, middle chambers focus on sound attenuation, and the final chamber manages exhaust flow. Each section's geometry is locally optimized rather than uniformly designed, achieving reliable gas control without excessive overall complexity

Inventive Principle:

Principle #3Local quality

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 audible and visible signatures while minimizing back pressure, ensuring safe operation by directing gases away from the operator and enhancing firearm performance.

Implementation Method 1

A suppressor is a muzzle accessory that reduces the audible report of the firearm by slowing the expansion and release of pressurized gases from the barrel

Methodology Applied

Scientific EffectGas expansion:

Implementation Method 2

Visible flash can also be reduced by controlling the expansion of gases leaving the barrel as well as by controlling how muzzle gasses mix with ambient air

Methodology Applied

Scientific EffectGas mixing:

Data Source

PatentUS12460888B1Suppressor with gas cross flow and reduced back pressure

Publication Date: 2025.11.04 SIG SAUER INC

AI summary

A suppressor for a firearm has a tubular housing extending along a bore axis from a proximal end to a distal end. A baffle stack within the hollow tubular housing extends along the bore axis and includes a tubular baffle wall with a plurality of baffle structures connected to an inside of the tubular baffle wall, where individual baffle structures taper proximally to a central opening on the bore axis. The suppressor defines an inner volume inside of the tubular baffle wall and an outer volume between the tubular baffle wall and the hollow tubular housing. Flow-directing structures in the outer volume include pairs of diverging vanes and pairs of converging vanes. A conduit between adjacent baffle structures defines a gas flow pathway in a radially outer portion of the inner volume and defines an opening located between the adjacent baffle structures to direct gas flow across the bore axis.