A compressed air foam system provided with an improved mixing system

By introducing a mixing module into the compressed air foam system and controlling the water flow path using conduits and valves, the problem of poor mixing caused by water flow oscillation is solved, enabling efficient foam solution generation under different water pressures, and making it suitable for multi-functional applications in fire trucks.

CN117750998BActive Publication Date: 2025-12-16IVECO MAGIRUS AG
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Patent Information

Application Number
CN202280030024.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2021-04-23
Filing Date
2022-04-21
Publication Date
2025-12-16
Estimated Expiration
2042-04-21

AI Technical Summary

Technical Problem

In existing compressed air foam systems, water flow oscillations lead to poor mixing of water, foaming agent, and air, especially at low water flow rates. The butterfly valve adjustment is insufficient to ensure good mixing.

Method used

The system employs a modular design, including an inlet conduit, an outlet conduit, and multiple bypass conduits. The water flow path is controlled by a check valve and an electrically actuated valve to ensure that water, foaming agent, and air are fully mixed in the mixing chamber.

Benefits of technology

It achieves effective mixing of water and foam solution under a wide range of water pressures, avoiding inferior foam solution at the outlet. The mixing module is compact and cost-effective, suitable for fire protection applications with different needs.

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Abstract

A compressed air foam system, CAFS (1), comprising a source (2) of water, an air management system (3) for providing a flow of compressed air, a solution dosing module (4) for providing an additive solution, and a mixing chamber module (5) configured to provide an air solution mixture to an output device (6), the mixing module (5) comprising an outlet conduit (8) fluidly connected to the output device (6) and an inlet conduit (7) fluidly connected to the source (2), the mixing module (5) comprising a plurality of bypass conduits (9a, 9b, 9c, 9d, 9e) between the inlet conduit (7) and the outlet conduit (8), the bypass conduits (9a, 9b, 9c, 9d, 9e) having different hydraulic diameters from each other and possibly valves (10) with associated different pressure openings.
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