RU2456042C1 - Foamgenerator of ejection type - Google Patents

Abstract

FIELD: fire-fighting means.

SUBSTANCE: invention is intended for use in automatic fire suppression systems. Foamgenerator of ejection type comprises a body, a distributing and guiding device. The housing consists of inlet pipe with a hole at one end and a plug on the other. The flange is attached perpendicular to the pipeline from the side of the hole, to which by at least three spokes a cylindrical shell is attached, connected by at least three spokes with a perforated disk, rigidly connected to the plug. On the pipeline at least three holes are placed perpendicular to the axis, and connected with it additional pipelines, each of which consists of two parts. Lengths of additional pipelines are increasing from the free end of the pipeline input to the end with a plug, and the axes of the additional pipelines are rotated relative to each other at an angle of 120°. On each of them, in order of length increasing from the peripheral plugged part of the pipeline to the axis of the main hole the offsets of varying length with the injectors at the ends are fixed, in front of which the perforated discs are located, fixed to the inlet pipe. The diameters of disks increase from the previous to the subsequent with additional pipelines. The nozzles are made from the shell, inside which there are two axisymmetric throttling holes: cylindrical and conical.

EFFECT: increased efficiency of spraying fire-extinguishing liquid foaming agent solution (high-expansion polydisperse foam).

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Description

The invention relates to the field of fire fighting equipment and is intended for use in automatic fire extinguishing systems by generating highly multiple polydisperse foam under conditions of smoke in the room while blocking fast-burning products with high-polydisperse foam.

The closest technical solution is a foam generator containing a housing, a distribution and a guiding device (RF patent No. 2136389, B05B 1/04, 1998, the prototype).

A disadvantage of the known object is the lack of the ability to create an optimal flow structure at the outlet and the insufficient efficiency and performance of spraying a fire extinguishing liquid solution of a foaming agent (high polydisperse foam).

The technical result is an increase in the spraying efficiency of a fire extinguishing liquid solution of a foaming agent (high polydisperse foam).

This is achieved by the fact that in a foam generator containing a housing, a distribution and a guiding device, the housing consists of an inlet pipe with a main hole on one side and a plug on the other, and a continuous flange is attached perpendicularly to the pipeline from the main hole, to which, at least at least three spokes attached a cylindrical shell connected by at least three spokes with a perforated disk rigidly connected to the plug, while on the pipe placed a ket for spraying a fire extinguishing liquid solution of a foaming agent, which consists of at least three perpendicular axes of the main opening and additional pipelines connected to it, each of which consists of two parts symmetrical about the axis of the main opening and lying in the same plane passing through the axis of the main hole, and the lengths of the additional pipelines increase from the free end of the inlet pipe to the plugged, while the axis of the additional x pipelines are rotated relative to each other by an angle equal to 120 °, and on each of them are fixed, in order of increasing length from the peripheral, plugged part of the pipeline to the axis of the main hole, bends of different lengths with nozzles at the ends in front of which perforated discs are fixed on the inlet pipe by means of bushings, and the diameters of the disks increase from the previous to the subsequent additional pipelines, while each of the nozzles consists of a housing, inside which there are two symmetrical throttle bore: cylindrical and tapered.

Figure 1 shows a General view of the foam generator ejection type, figure 2 is a diagram of the nozzle.

The ejection-type foam generator has a housing (Fig. 1), which consists of an inlet pipe 1 with a main opening 2 on one side and a plug 12 on the other. A continuous flange 3 is perpendicularly attached to the pipeline 1 from the side of the main opening 2, and to it by means of at least three spokes 4 a cylindrical shell 5 is attached, which is connected by at least three spokes 7 with a perforated disk 6, rigidly connected to plug 12. On the pipe 1 there is a bag for spraying a fire extinguishing liquid solution of the foaming agent, which consists of at least three perpendicular to the axis of the main hole 2 and connected with it x pipelines 9, 10, 11, each of which consists of two parts symmetrical about the axis of the main hole 2 and lying in the same plane passing through the axis of the main hole 2, and the lengths of additional pipelines 9, 10, 11 increase from the free end of the inlet pipe 1 to the end plugged by means of a plug 12.

The axes of the additional pipelines 9, 10, 11 are rotated relative to each other by an angle equal to 120 °. On each of the additional pipelines 9, 10, 11 are fixed, in order of increasing length from the peripheral, plugged part of the pipeline to the axis of the main hole 2, bends 13 of different lengths (short, medium and long) with nozzles at the ends in front of which perforated disks 14 , 15, 16, mounted on the inlet pipe 1 by means of bushings 8, and the diameters of the disks 14, 15, 16 increase from the previous to the subsequent pipelines 9, 10, 11.

Each of the nozzles (Fig. 2) consists of a housing 17, inside of which there are two axisymmetric throttling holes: cylindrical 18 and conical 19. The solution (liquid) is supplied first through cylindrical 18 and then through conical 19 throttling holes. The foam generator is installed directly above the zone of possible ignition; the length of the created jet in the horizontal or vertical position of the generator does not exceed 1.8 m.

Foam ejector type works as follows.

In the event of a fire, the pumping unit (not shown in the drawing) delivers the foaming agent solution from the metering tank or the fire engine to the inlet pipe 1 of the foam generator, from where it is supplied under pressure 2 to additional pipelines 9, 10, 11 with outlets 13 equipped with nozzles. The jets from the bends fall onto the perforated disks 14, 15, 16.

Each of the nozzles works as follows.

The fluid is supplied through a cylindrical throttling hole 18 to a conical 19, which is a diffuser that increases the fragmentation of liquid droplets due to turbulence in the outlet stream. Obtaining foam in the conditions of smoke in the room is carried out according to the principle of air ejection by sprayed jets of a 6% aqueous solution of a fluorinated foam former from nozzles located in the foam dispenser.

At the beginning of the torch, the sprayed spray of the foaming agent solution has the highest speed, and when it enters the perforated disk due to air ejection, a foam is formed with small bubbles (2-3 mm across) from long branches 13, and from short branches the speed of the jet decreases, and then foam with larger bubbles (4-12 mm across) forms on the disk. Thus, the foam generator produces polydisperse (differently sized for bubbles) foam, which has the property of rapid spreading over the surface.

Tests have shown that even in conditions of intense smoke, foam is formed in predetermined volumes and has good resistance to decomposition.

As a foaming agent in such fire extinguishing systems, a fluorosynthetic foaming agent of the "Multipena" type is used. It also works on a 6% aqueous solution of fluoride-containing foaming agent "Sublayer" under conditions of smoke in the room.

The foam generator is designed for automatic fire extinguishing systems of closed technological rooms (supplying foam to the ignition site), where vapor and gas mixtures can form, for example, in pump rooms of pumping stations, pressure control chambers, etc.

Claims (1)

An ejection-type foam generator containing a housing, a distribution and a guiding device, characterized in that the housing consists of an inlet pipe with a main hole on one side and a plug on the other, and a solid flange is perpendicularly attached to the pipe from the main hole, to which, at least at least three spokes attached a cylindrical shell connected by at least three spokes with a perforated disk rigidly connected to the plug, while on the pipe e placed a bag for spraying a fire extinguishing liquid solution of a foaming agent, which consists of at least three, located perpendicular to the axis of the main hole and connected to it by additional pipelines, each of which consists of two parts symmetrical about the axis of the main hole and lying in the same plane passing through the axis of the main hole, and the lengths of additional pipelines increase from the free end of the inlet pipe to the plugged, while the axis additional pipelines are rotated relative to each other by an angle equal to 120 °, and on each of them are fixed, in order of increasing length from the peripheral, plugged part of the pipeline to the axis of the main hole, bends of different lengths with nozzles at the ends in front of which perforated disks are fixed on the inlet pipeline by means of bushings, the diameters of the disks increasing from the previous to the subsequent additional pipelines, each of the nozzles consisting of a housing, inside of which there is two axisymmetric throttling holes are laid: cylindrical and conical.

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