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Water mist fire extinguishing system

A fire extinguishing system and fine water mist technology, which is applied in fire rescue and other fields, can solve the problems of short range, limited use, and high cost of water mist, and achieve the effects of increasing the initial velocity of water mist, reducing working pressure, and stabilizing the particle size of water mist

Active Publication Date: 2019-01-01
北京喜安妮科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, halon gas has a good fire extinguishing effect, but it is toxic and pollutes the environment, and its use in some high-precision instruments or valuable places such as engine rooms is restricted.
The effect of the carbon dioxide fire extinguishing system is also better, but the liquid CO 2 The storage conditions are relatively high, improper operation will cause harm, and due to CO 2 Excessive concentrations of carbon dioxide can cause suffocation to people, so carbon dioxide cannot be used to extinguish fires in places where people often stay or work
[0005] The current water mist fire extinguishing system has the following disadvantages: the particle size of the fine water mist is not small enough, unstable, and cannot guarantee the protection of objects particularly afraid of water; the power of the fine water mist is insufficient, and the range of the water mist is short; the working pressure of the high-pressure fine water mist Large, not suitable for extinguishing close-range B-class fires that are prone to boiling and overflowing, and the cost is high

Method used

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  • Water mist fire extinguishing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A specific embodiment of a fine water mist fire extinguishing system, its composition is as follows figure 1 As shown, it includes the intake system, the first Laval nozzle 1, the water tank 3, the ejector 4, the second Laval nozzle 2 and the nozzle 6, wherein the compressed air output of the intake system is two ways, and one way passes through the pipe One way is connected with the first Laval nozzle 1, the other way is connected with the water tank 3 through the pipeline, and each way is controlled by the valve 5 respectively; the first Laval nozzle 1 and the water tank 3 are connected with the ejector 4 through the pipeline , and the air inlet and water outlet of the water tank are controlled by valves; the ejector 4 is connected with the second Laval nozzle 2 and the nozzle 6 in turn.

[0024] The inlet diameter of the first Laval nozzle 1 is 8.0 mm, the diameter of the throat pipe 12 is 1.3 mm, the outlet diameter is 5.0 mm, and the length of the expansion section...

Embodiment 2

[0028] The structure and operation process of this embodiment are the same as in Embodiment 1. The inlet diameter of the first Laval nozzle is 8.2mm, the throat diameter is 1.5mm, the outlet diameter is 5.2mm, and the length of the expansion section is 22mm; The inlet diameter of the Laval nozzle is 5.2mm, the diameter of the throat is 2.7mm, the diameter of the outlet is 10.2mm, and the length of the expansion section is 44mm. Two Laval nozzles are connected end to end with a high-pressure water pipe with a diameter of 5.4mm.

[0029] In this embodiment, the flame in the oil tank with a diameter of 5.8 m after burning a mixture of 3 / 4 gasoline and 1 / 4 water is extinguished in the oil tank, and the total water consumption is less than 8.5 L, and it takes about 20 seconds.

Embodiment 3

[0031] The structure and operation process of this embodiment are the same as in Embodiment 1. The inlet diameter of the first Laval nozzle is 7.8mm, the throat diameter is 1.1mm, the outlet diameter is 4.8mm, and the length of the expansion section is 21mm; The inlet diameter of the Val nozzle is 4.8mm, the throat diameter is 2.3mm, the outlet diameter is 9.8mm, and the length of the expansion section is 41mm; the outlet diameter of the first Laval nozzle and the inlet diameter of the second Laval nozzle are both The diameter is 5.0mm, and two Laval nozzles are connected end-to-end with a diameter of 5.2mm high-pressure water pipe.

[0032] In this embodiment, the flame in the oil tank with a diameter of 5.8 m after burning a mixture of 2 / 3 diesel oil and 1 / 3 water is extinguished in the oil tank, and the total water consumption is less than 9 L, and the time is about 28 s.

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Abstract

A water mist fire extinguishing system comprises a first laval jet tube, an injector, a second laval jet tube and a nozzle. The water mist fire extinguishing system adopts two laval jet tubes, and compressed air flows through the first laval jet tube to improve the flow speed; and when a high speed moving gas and water go through the injector, generated water mist is mixed and is injected into the second laval jet tube, and the water mist has a reduced pressure and an accelerated speed under the action of the second laval jet tube, and the high speed jetted water mist reaches the nozzle in order to complete jet. The above structure makes the initial velocity of the water mist increased and the particle size of the water mist stable, and enables the average particle size to be 140mum, so a fire source can be effectively covered, waste reduction can be realized, the protection of objects especially afraid of water is guaranteed, the structure is simple, and the cost is low; and additionally, the acceleration of the water mist in the laval jet tubes makes the work pressure of the fire extinguishing system decreased when the same water mist particle size is reached, so the life safety is guaranteed.

Description

technical field [0001] The invention relates to a fine water mist fire extinguishing system, in particular to a fine water mist fire extinguishing system with a combination of two Laval nozzles, belonging to the field of fire protection. Background technique [0002] Traditional fire extinguishing systems include: halon gas system, carbon dioxide system, automatic sprinkler system, etc. Among them, halon gas has a good fire extinguishing effect, but it produces toxicity and pollutes the environment, and its use in some high-precision instruments or valuable places such as engine rooms is restricted. The effect of the carbon dioxide fire extinguishing system is also better, but the liquid CO 2 The storage conditions are relatively high, improper operation will cause harm, and due to CO 2 Excessive concentrations of carbon dioxide can cause suffocation to people, so carbon dioxide cannot be used to extinguish fires in places where people often stay or work. In addition, a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62C31/00
Inventor 白云飞张京红佟晓楠张铁英李潮
Owner 北京喜安妮科技发展有限公司
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