CN203710574U - Nitrogen fire-fighting device applicable to open space - Google Patents

Abstract

The utility model belongs to the technical field of fire-fighting safety, relates to a fire-fighting device, and particularly relates to a nitrogen fire-fighting device applicable to an open space. The device comprises a nitrogen gas source, a gas supply pipeline and a gas collection ring; the nitrogen gas source is communicated with the gas collection ring through the gas supply pipeline; a plurality of gas outlets are formed in the gas collection ring. A fire in the open space can be effectively put out by using the device and a method disclosed by the utility model.

Description

A kind of nitrogen fire plant that is applicable to open spaces

Technical field

The utility model belongs to security against fire technical field, relates to a kind of fire plant, is specifically related to a kind of nitrogen fire plant that is applicable to open spaces.

Background technology

At present, along with the develop rapidly of aeronautical and space technology, the engine that aerospace flight vehicle uses requires more and more higher, and use and liquid oxygen-kerosene are used the most extensive as the Aero-Space engine of fuel.Liquid oxygen-kerosene is that the Aero-Space engine of fuel is reusable new work engine, in research and development process of the test, as small-sized fault occurs, may have on a small quantity and catch fire; Once the situation of catching fire can be abnormally dangerous, may cause the damage of whole engine, can cause huge economic loss; Based on the problems referred to above, conventional method is when the intensity of a fire is uncontrollable, to adopt water to carry out fire-fighting at present, and the material at high temperature of some on engine can be caused engine cannot continue to use by unexpected cooling meeting like this.

In addition, the testing stand of liquid oxygen-kerosene engine is arranged on open spaces, due to natural wind in air affect some conventional fire-fighting equipments or extinguishing method cannot implement.

Utility model content

In order to overcome the problem in background technology, the nitrogen fire plant that the utility model provides a kind of burning things which may cause a fire disaster of having guaranteed that engine failure produces to Aero-Space in open spaces effectively to put out

Concrete technical scheme of the present utility model is:

A nitrogen fire plant that is applicable to open spaces, is characterized in that: comprise nitrogen source of the gas, steam line and collector ring; Described nitrogen source of the gas is communicated with collector ring by steam line; On described collector ring, offer a plurality of ventholes.

Above-mentioned steam line comprises air feed main pipeline and a plurality of laterals that are connected with air feed main pipeline respectively; Described lateral is connected with collector ring.

On above-mentioned air feed main pipeline, set gradually abacus and pneumatic stopping valve; On described lateral, magnetic valve is installed.

Above-mentioned a plurality of venthole along the circumferential direction distributes.

The utility model has the advantage of:

1, the utility model adopts large flow velocity nitrogen extinguishing, can not only completely cut off air, and can take away rapidly heat, to open spaces fire extinguishing successful.

2, in system of the present utility model, adopt and at collector ring and on collector ring, be covered with venthole, large to the control range of burning things which may cause a fire disaster.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model

Fig. 2 is the partial schematic diagram of collector ring.

1-nitrogen source of the gas, 2-pneumatic stopping valve, 3-steam line, 4-magnetic valve, 5-lateral, 6-collector ring, 7-venthole, 8-air feed main pipeline, 9-orifice plate.

The specific embodiment

In order effectively to solve the burning things which may cause a fire disaster that engine failure produces to Aero-Space in open spaces, effectively put out, utility model people provides a set of nitrogen fire plant that is applicable to open spaces.

This device comprises nitrogen source of the gas 1, steam line 3 and collector ring 6; Nitrogen source of the gas 1 is communicated with collector ring by steam line 3;

On collector ring 6, offer a plurality of ventholes 7;

Specifically, the steam line 3 in this device comprises air feed main pipeline 8 and a plurality of laterals 5 that are connected with air feed main pipeline respectively; Lateral 5 is connected with collector ring 6.

In addition, on the air feed main pipeline 8 of this device, set gradually abacus 9, pneumatic stopping valve 2; Magnetic valve 4 is installed on lateral 5.

Structure below in conjunction with 1 pair of this device of accompanying drawing is described in detail:

This device comprises that a lateral 5 that two air feed are provided respectively on the nitrogen discharge of nitrogen source of the gas 1, the air feed main pipeline 8 being connected with nitrogen discharge, air feed main pipeline 8 for providing, two laterals 5 are connected with collector ring 6 respectively, be covered with venthole 7 on collector ring 6;

In addition, orifice plate 9 for controlling uninterrupted has also been installed on air feed main pipeline 8, has been used for controlling the pneumatic stopping valve 2 of this road break-make; Magnetic valve 4 has been installed on two laterals 5 and has been used for controlling the break-make on this road.

Engine is being carried out in test run process of the test, when producing burning things which may cause a fire disaster, nitrogen discharge starts air feed, the pneumatic stopping valve being arranged on air feed main pipeline is opened, the magnetic valve being simultaneously arranged on lateral is also opened, nitrogen gas enters collector ring and from venthole ejection, puts out timely burning things which may cause a fire disaster.

Utilizing this to install most crucial problem is exactly to determine the minimum nitrogen supply of nitrogen source of the gas.Minimum nitrogen supply is by the space wind speed of open spaces and the area definition of hot spots, because on the one hand, too high wind speed can encourage spreading of flame, on the other hand, under open spaces, too high wind speed also may cause the reduction of nitrogen gas concn, affects the isolation effect of nitrogen to oxygen.Meanwhile, determining of hot spots area also directly has influence on final fire extinguishing effect, and utility model people has carried out weighting to the burning area of hot spots, so that minimum nitrogen supply is definite.

Below this method is described in detail:

Step 1] determine the air speed value of open spaces;

Staff uses air speed measuring apparatus, the open spaces that may catch fire is carried out to the measurement of space wind speed, and the numerical value of space wind speed is carried out to record;

Step 2] the determining of burning area weighted value size; Burning area weighted value is: the product of hot spots importance rate and flammability rating;

The specific implementation method of this step is:

Step 2.1] to there is importance, the inflammability at the position of burning, judge;

Specifically: utility model people carries out tabular assessment by empirical value to the position that may burn, hot spots importance is classified, type comprises: common, important, extremely important three classes; , the inflammability of hot spots is classified, type comprises meanwhile: nonflammable and easy firing;

Table 1 is possible hot spots importance and flammable judgement

Step 2.2] desirability of hot spots and inflammability are carried out to grade conversion;

Importance definition: be commonly 1, be importantly 2, extremely important be 4;

Inflammability definition: nonflammable is 1; Easy firing is 2;

Step 2.3] grade * flammability rating of burning area weighted value=desirability.

Table 2 different parts burning area weighted value table

Step 3] by air speed value definite in above-mentioned two steps and burning area weighted value, the minimum nitrogen supply of fire plant is calculated.

Its concrete calculation relational expression is:

min(Q _n2)=1.678+0.042V _f-0.133S _h+0.4V _f ²+0.021S _h ²+0.933V _fS _h)

Wherein: V _ffor wind speed, m/s; S _hfor burning area weighted value ， ㎡; Min (Q _n2) be the minimum supply of nitrogen, kg/s.

In addition, after nitrogen minimum amount is determined, by nitrogen minimum amount, determine the pipe diameter size of supply air line in this fire plant; It is specifically:

1) internal pressure of collector ring is determined

Because this nitrogen fire plant ejection pressure is too high, nitrogen extinguishing effect reduces; Ejection pressure is too low, can not reach the function of whole fire extinguishings, guarantee stable gas flow, be that the space environment of 2 meters-3 meters is according to result of the test for the quenching distance of needs, 0.5MPa >=collector ring internal pressure Pny≤0.9MPa, can guarantee that air-flow has good fire-fighting effect.Can adjust according to actual quenching distance.

2) the required circulation orifice plate of the pipeline of this nitrogen fire plant area calculates

First, the calculating of air feed main pipeline aperture plate area:

$f=\frac{5.16\×\min \left(Q_{n2}\right)}{P_{\mathrm{ey}}-P_{\mathrm{ny}}}---\left(1\right)$

In formula: f---orifice plate area, cm ²;

Min (Q _n2)---be the minimum supply of nitrogen, kg/s.

Pey---nitrogen bleed pressure (conventionally, selected 3.4Mpa is nitrogen bleed pressure), Mpa.

Pny---collector ring internal pressure (conventionally, selected 0.6Mpa is collector ring internal pressure), Mpa.

Orifice plate diameter is calculated as follows

$D=10\sqrt{\frac{4f}{\mathrm{\π}}}---\left(2\right)$

In formula: D---orifice plate diameter, mm.

Then, according to orifice plate area, choose and be applicable to air feed main pipeline, must guarantee that the sectional area of air feed main pipeline is greater than orifice plate area.

In addition, on collector ring, the pore size of venthole and the number of openings also directly have influence on fire extinguishing effect.

Choosing of venthole aperture: according to the requirement of using, through great many of experiments, draw, smaller hole has the uniform advantage of gas distribution on the one hand, but too small perforate cause difficulty of processing and the cycle longer, the workload of Comprehensive Experiment result and perforate, we think that bore size selection Φ 2-Φ 3 is advisable, and the position that can need to put out a fire to emphasis according to field condition adopts less hole, and less important position adopts larger hole

After the aperture of venthole is determined, the minimum supply GBk of nitrogen and the number of openings while having single venthole on the aperture calculating collector ring according to definite venthole

$G_{\mathrm{BK}}=\frac{(P_{\mathrm{ey}}-P_{\mathrm{ny}})\·\frac{\mathrm{\π}}{4}{D_1}^2}{5.16}---\left(1\right)$

The number of openings is calculated as follows:

$N=\frac{\min \left(Q_{n2}\right)}{G_{\mathrm{BK}}}---\left(2\right)$

In formula: N---the number of openings;

D1 is the aperture (conventionally choosing Φ 2.5 calculates) of venthole

Min (Q _n2)---be the minimum supply of nitrogen, kg/s.

GBK---the minimum supply of nitrogen during single venthole, kg/s.

Claims (4)

1. a nitrogen fire plant that is applicable to open spaces, is characterized in that: comprise nitrogen source of the gas, steam line and collector ring; Described nitrogen source of the gas is communicated with collector ring by steam line; On described collector ring, offer a plurality of ventholes.

2. the nitrogen fire plant that is applicable to open spaces according to claim 1, is characterized in that: described steam line comprises air feed main pipeline and a plurality of laterals that are connected with air feed main pipeline respectively; Described lateral is connected with collector ring.

3. the nitrogen fire plant that is applicable to open spaces according to claim 2, is characterized in that: on described air feed main pipeline, set gradually abacus and pneumatic stopping valve; On described lateral, magnetic valve is installed.

4. the nitrogen fire plant that is applicable to open spaces according to claim 3, is characterized in that: described a plurality of ventholes along the circumferential direction distribute.