Intermittent spray fire extinguishing device using liquid fire extinguishing agent, and method thereof

By designing an intermittent spray-release fire extinguishing device using liquid fire extinguishing agent, the ball screw mechanism drives the screw and the rotary cover to rotate, so that the spray holes and the nozzles periodically overlap and interlaced, the problem of traditional fire extinguishing devices being difficult to completely discharge gas in the battery box, and the periodic change in the pressure in the battery box is achieved, reducing the risk of rekindling and achieving the effect of continuous suppression.

WO2025055135A1 Publication Date: 2025-03-20HUBEI JIANDUN FIRE TECH CO LTD
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Patent Information

Application Number
PCT/CN2023/135115
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-15
Filing Date
2023-11-29
Publication Date
2025-03-20

AI Technical Summary

Technical Problem

When the battery is thermally out of control, the discharged gas is difficult to completely discharge from the battery box, resulting in a risk of rekindling; while the pulsed fire extinguishing device cannot achieve continuous suppression.

Method used

An intermittent spray-discharge fire extinguishing device using liquid fire extinguishing agent is designed. The screw and rotating cover are driven by the ball screw mechanism, so that the spray holes and the nozzles periodically overlap and interlaced, thereby realizing intermittent spraying of liquid fire extinguishing agents, periodically increasing and reducing the pressure in the battery box.

Benefits of technology

Effectively ensure that the combustible gas in the battery box is completely discharged, reduce the risk of rekindling, and achieve the effect of continuous suppression.

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Abstract

An intermittent spray fire extinguishing device using a liquid fire extinguishing agent, comprising a housing (1) and a gas-generating fire extinguishing agent (2) provided in the housing (1). A front cover (3) is provided on a front side of the housing (1), spray orifices (4) being formed in the surface of the front cover (3). An end surface of the gas-generating fire extinguishing agent (2) is connected to an end of an activation component (5). A piston (7) in sliding fit with the housing (1) is provided in the housing (1), and the piston (7) is connected to the bottom of the front cover (3) by means of a lead screw (6.1) of a ball screw mechanism (6), the top of the lead screw (6.1) being fixedly connected to the center of a rotating cover (8), and external threads (6.1.1) of the lead screw (6.1) being divided into multiple sections at equal intervals. A liquid fire extinguishing agent (12) is provided between the piston (7) and the front cover (3), and spray holes (9) are formed in the surface of the rotating cover (8). When the rotating cover (8) rotates, the spray holes (9) and the spray orifices (4) are periodically aligned and misaligned with each other to continuously perform an intermittent spraying process, such that the pressure in a battery compartment periodically increases and decreases, helping to completely discharge combustible gas from batteries in the battery compartment to avoid the risk of re-combustion. Further disclosed is a fire extinguishing method of the intermittent spray fire extinguishing device using a liquid fire extinguishing agent.
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