Fire Extinguisher Admixer Dosing Precision
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Solution Overview
Problem
Existing admixers for fire extinguishing devices face challenges with imprecise and poorly reproducible dosing of foaming agents at smaller rates, and their lateral adjustment mechanisms are prone to damage and unintentional adjustments during rough handling in firefighting operations.
Innovation Solution
An admixer design featuring a cylindrical base body with a main channel and an additive channel, where the metering of the additive is controlled through a metering sleeve with multiple bores of varying sizes and a rotatable diaphragm body, allowing precise adjustment of the additive flow, and a conical axial section for sealing, combined with a support stand for robustness and ease of handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lateral adjustment wheel is used for dosing control, then the dosing rate can be adjusted, but the setting is imprecise and poorly reproducible for smaller dosing rates
Solution Approach 1:
The patent replaces the lateral adjustment wheel mechanism with a rotary control integrated into the additive channel assembly. This new mechanism uses a rotary motion to adjust the opening cross-section of the additive channel, providing more precise control over smaller dosing rates while maintaining operational ease through a centralized control location.
2Ease of operation
If the adjustment wheel is laterally mounted, then it is accessible for adjustment, but it can be damaged or unintentionally adjusted due to exposed position
Solution Approach 1:
The patent merges the adjustment control into the main body of the additive channel assembly, specifically integrating it with the channel structure itself. This consolidation eliminates the exposed lateral adjustment wheel, protecting it from damage and unintentional adjustment while maintaining accessibility through the integrated rotary control on the additive channel.
3Adaptability or versatility
If a rotary regulator is used to change flow cross section, then dosing rate can be adjusted, but the setting is imprecise for smaller dosing rates
Solution Approach 1:
The patent applies local quality by creating a specific geometric configuration of the additive channel opening with a defined cross-sectional area that varies along its length. This localized geometric design, combined with the rotary adjustment mechanism, enables precise control over smaller dosing rates by carefully controlling the opening dimensions at critical locations within the channel.
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 admixer achieves precise and reproducible dosing of additives from 0 to 6% with enhanced robustness and resistance to unintentional adjustments, ensuring accurate and reliable operation in firefighting scenarios.
Implementation Method 1
a metering sleeve is provided in the area of the mouth of the additive channel in the main channel which encloses the main channel on its outer circumference, having a large number of metering bores arranged at a distance from one another over the circumference and having cross-sectional areas of different sizes
Implementation Method 2
a conical axial section for sealing
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to a proportioner for a fire extinguishing device for adding an additive to a fire extinguishing water stream; - comprising a main channel; - comprising an additive channel. The proportioner according to the invention is characterized in that - in the region of the opening of the additive channel in the main channel, a metering sleeve is provided, which has a plurality of metering bores arranged at intervals around the circumference or at least one metering opening extending around the circumference, wherein - the metering sleeve is associated with an orifice body (14) that radially encompasses the metering sleeve (13) in the circumferential direction, wherein the additive channel opens into the main channel via one of the metering bores or the metering opening and an associated orifice opening.