CN1754589A - Method for mixing and supplying liquid-gas for fire fighting installation - Google Patents

Abstract

The invention aims to provide a novel method, which can generate fine liquid mist for a fire service installation with the aid of a small and cheap pump. In the method, with the aid of a gas source (4), a pressure intensity of 50-300 Pa is provided in an eduction tube (2) of a fire service installation, then, the pressure intensity is reduced; a high-pressure pump generates a liquid pressure intensity which is corresponding to the pressure intensity; and then the pump generates a liquid pressure intensity in the eduction tube, and the liquid pressure intensity is adjusted to the pressure intensity which is provided by the gas source and gradually decreases later.

Description

Gas mixed with liquid think that fire plant provides the method for extinguishing fluid

The application is dividing an application of No. the 95192516.4th, Chinese patent application.

The present invention relates to a kind of method, this method is used for gas is mixed with liquid, think that a kind of fire plant provides a kind of extinguishing fluid, this fire plant comprises the pipeline of drawing of linking shower nozzle, this method is included in the described mist under certain pressure intensity of drawing in the pipeline, and extinguishing fluid is delivered to this with the pressure that equates substantially draw pipeline.

For example as in No. 92/20453, international patent application book WO propose, the gasoline flame of some kind for example stands kerosene flame in the aircraft jet engine of engine test and promptly uses the such liquid of strong smog to spray also may to extinguish the blaze hardly in the hangar that designs for engine test.Such a jet engine flame is virtually completely had very little particulate when the whole hangar that may have about 3000cm3 volume is usually suffered " flooding fully " liquid smog is full of Shi Caineng and extinguishes.

Liquid smog can produce with the device as illustrated in No. 93/10859, international patent application book WO in principle.In this application book, drawing on the ascending tube (Outgoing ascension tube) of a kind of hydraulic accumulator has some cinclides (Wall apertures), make the just liquid that the propelling gas of this accumulator is displaced at the beginning like this, and liquid level drop to the general height of uppermost pipe tap after, along with liquid level descends increasing pipe tap when exposing liquid level, just beginning gradually has propelling gas to sneak in the liquid of ejaculation.In the final stage of emptying accumulator, might obtain useful liquid smog with enough little droplet, what slattern but the liquid in the hydraulic accumulator is discharged as nonuseable part is too big.

An object of the present invention is to provide a kind of method of novelty, this method can be got very thin mist for fire plant produces by the pump of compact and low-cost.The method is characterized in that to produce a kind of very thin liquid mist of getting, this liquid mist comprises gas and mixtures of liquids, and the generation of this liquid mist may further comprise the steps:

-in drawing pipeline, produce the pressure of 50-300 crust by source of the gas, and reduce this pressure subsequently; And

High-pressure pump of-use, this high-pressure pump provides in the pipeline and the corresponding liquid pressure of the described pressure of gas source described drawing, and the pressure that this pump provides in drawing pipeline subsequently that a liquid pressure-this liquid pressure is adjusted to is that gas source provides, reduce subsequently gradually, and draw at this with a less flow by this pump described extinguishing fluid is provided in the pipeline.

The effect of gas is that drop can be got is very little, thereby produces a kind of liquid smog that looses into particulate.When the pressure in the pipeline that is leading to nozzle increases, the particulate in the liquid smog will be got more tiny.In the method, source of the gas is configured to the identical high pressure of pump gas is sneaked into the pipeline of drawing of pump at least substantially.

Preferably, compressed gas cylinder is used as source of the gas.Source of the gas is more favourable with a plurality of compressed gas cylinder ratio of components that are connected in parallel.Gas can be nitrogen, argon gas, air etc.Any in principle suitable gas all can use.What held in the compressed gas cylinder can partly be liquid form, and this will depend on the type of employed gas.The initial inflation process pressure of source of the gas is the 50-300 crust.The blowing pressure of gas cylinder is the same with the operating pressure of pump, can be about 50-200 crust, though lower or higherly all be fine.

A smaller pump discharge meaning is that flow flow than relevant sprinkler head or shower nozzle when maximum working pressure (MWP) is little in this sense.Pump discharge can be the 10-80% of the flow of total fire-extinguishing fluid, preferably 20-50% when maximum working pressure (MWP).

Therefore, people can select low price, the little little water pump of power for use.

Under the situation that the pure oil of what is called catches fire, concentrated foam and extinguishing fluid mixed to produce mutually a kind ofly preventing that the more fiery foam that stops up on fire is favourable.The common efficient of the device that is used for this purpose that people understood so far is very low, because pyrotechnics can destroy foam, in other words, can hinder concentrated foam to form foam.

Can form foam effectively according to device of the present invention because simultaneously the pure gas of Pen Sheing for example the amount of nitrogen is bigger, thereby can protect pyrotechnics directly directly not contact with the concentrated foam of injection.

When on the motorcar deck of for example car ferry, catching fire, not that other materials of oils such as timber, cardboard also can burn.In order also to defeat such fire, in the preferred embodiment of the present invention, source of the gas, preferably a plurality of gas cylinders, be configured to find time one or more liquid tank so that can suppress fire at least in the phase I, and air pressure the operating pressure with pump is the same high at least haply when liquid tank is found time.

The present invention will be described below with reference to accompanying drawings, and accompanying drawing shows two preferential embodiment of device proposed by the invention.

Fig. 1 represents an embodiment who produces the liquid smog that looses into particulate immediately.

Fig. 2 represents that a beginning atomizing of liquids then produces and looses into the liquid smog of particulate and the embodiment of foam.

Embodiment shown in Figure 1 has one to have the pump of drawing pipeline 21 that leads to a plurality of shower nozzles 3.Pump 1 can be that an exemplary operation pressure is the high-pressure pump of 50-200 crust.A plurality of compressed gas cylinders that are connected in parallel 4 are connected with the pipeline 2 of drawing of pump 1 by guaranteeing the check valve 5 that does not have liquid can flow to compressed gas cylinder 4.Being installed in the same gases that guarantee of a check valve 6 that pump 1 draws on the pipeline 2 will correctly carry.Compressed gas cylinder 4 can fill with nitrogen.Air pressure in the compressed gas cylinder is suitable with the 100-300 crust.

Choke valve 31 is connected drawing on the pipeline 30 between the pipeline 2 of compression bottle and pump.The purposes of choke valve 31 is to regulate the mixed proportion that flows into the liquids and gases in the extinguishing fluid of drawing pipeline 2.Choke valve 31 is not absolutely necessary.Also can consider to regulate this mixed proportion by the various sizes of selected pipeline 30.

In Fig. 2, the pump group that can for example form of reference number 11 expressions by two 11 kilowatts pump of the pressure that respectively has about 50 liters/shunt volume and about 120 crust.Draw pipeline 12 for one and lead to a plurality of fire district A-E with corresponding shower nozzle or sprinkler head 13A-13E.Be equipped with a plurality of compressed gas cylinders 14 and a plurality of liquid tank 15 that for example is total up to 400 liters for each pump.Initial pressure for example is that the Compressed Gas of 200 crust drive liquid at first forcefully with for example 1000 liters/minute flow and deliver to the fire district that has respectively started from liquid tank 15.After this working condition is similar to Fig. 1 substantially.After liquid in these bottles was evacuated, the pressure in the pressurized gas bottle 14 dropped to 120 crust, dropped to the pressure of pump 11 in other words.After this, the pressure of pump 11 itself will be regulated according to the pressure of compressed gas cylinder 14, make that pump discharge is the 20-100% of the extinguishing fluid total flow that descends gradually.When not having gas thereby gas pressure to drop to zero in compressed gas cylinder 14, pump discharge is 100% of an extinguishing fluid total flow just.

The container of a dress concentrated foam is represented with 16, and a foams mix equipment is represented with 17.A fresh-water tank for example is 3000 liters, represent with 18, and seawater or lake water bindiny mechanism represents with 19.

In the phase I, when the liquid in the pump drainage liquid tank 15, the effect of pump group 11 can be ignored.Valve 20 must be opened during the described phase I, makes water can not enter foams mix equipment 17, and assurance equipment 17 can not be worked.Because the starting stage in fire extinguishing must avoid foam to sneak into extinguishing fluid.This is because foam has the bigger ill-effect of drop that makes the nozzle ejection, thereby has hindered the formation of the liquid smog that looses into particulate.In the fire extinguishing starting stage, need loose into the liquid smog of particulate especially.Therefore the starting stage foam in fire extinguishing will not play a part.

After liquid tank 15 is evacuated, just can guarantee to produce effectively the liquid smog that looses into particulate by using fresh-water tank 18 with the above representative value that provides, keep about half an hour, after this, can use seawater or lake water if necessary.

After water smog is lived the control of fire, valve 20 can cut out, so that foam is added extinguishing fluid, thereby produce thick " froth bed " (the foam matting) of one deck, prevent once more on fire.Device that it should be noted that Fig. 2 not necessarily leaves no choice but have a foams mix equipment.In fact, valve 20 is to cut out by such mode, and promptly the pressure switch 140 of connecting line 130 (for example 30 crust) after pressure is reduced to predetermined value produces a pressure signal.Therefore, this pressure signal is being controlled valve 20.

Certainly gas cylinder 14 also can be connected to and draw pipeline 12, without liquid tank 15.

More than describe the present invention by example, therefore it should be noted that the present invention can revise aspect a lot of details in the scope of additional claims.For example, can revise aspect the realization compressed gas source.Gas source there is no need and must form with pressurized gas bottle.

Claims (2)

1. be used for gas mixed with liquid and think that a kind of extinguishing device provides a kind of a kind of method of extinguishing fluid, this extinguishing device comprises to shower nozzle (3; 13A draws pipeline (2 for 13E) one; 12), described method is included in this and draws in the pipeline to draw in the pipeline with about equally pressure with a pressure mist and at this and transmit extinguishing fluid, it is characterized in that having produced by following steps a kind of tiny liquid mist of a kind of mixture that comprises gas and liquid:

By gas source (4; 14) drawing pipeline (2; 50-300 is provided 12) high pressure of crust, and reduces this pressure subsequently; And

Utilize a high-pressure pump (1; 11), this pump is drawn pipeline (2 at this; 12) provide in and the corresponding liquid pressure of the described high pressure of gas source, and this pump draws at this subsequently a liquid pressure is provided in the pipeline, this pressure is adjusted to gas source (4; 14) pressure that provided, that reduce gradually subsequently, and draw at this by this pump and with a less flow described extinguishing fluid is provided in the pipeline.

2. according to the method for claim 1, it is characterized in that utilizing compressed gas cylinder as gas source (4; 14).