RU178495U1 - BUILT-IN FOAM RECEIVER - Google Patents

Abstract

The utility model relates to the field of fire extinguishing, in particular to methods for preparing foam of low and medium multiplicity. The utility model can be used to extinguish solid combustible materials (class A), combustible liquids, or melting solids and materials (class B). The essence of the utility model is that the installation is made in the form of an insert in a hose line, and compressed air to create foam is supplied from replaceable cylinders used in breathing apparatus by fire departments, and the insert body is made in the form of a pipe with a diameter of 75 mm with connecting heads of the GM- type 80 with a flange connection at both ends, and the duct is made with a diameter of 20 mm with radial holes 3 mm in diameter located on it, while compressed air is supplied to the working chamber through the perpendicular to the body the installed duct has three rows of radial openings, which allow the directional distribution of the incoming air flow in the supplied solution over the entire cross section of the working chamber in a directional direction along the flow and to the sides, and two grids with 5-6 mm cells are installed in the working chamber of the device; help threads inside the case with the ability to replace with others with a different cell size.

Description

The utility model relates to the field of fire extinguishing, in particular to methods for preparing foam of low and medium multiplicity. The utility model can be used to extinguish solid combustible materials (class A), combustible liquids, or melting solids and materials (class B).

Recently, it has been of interest to use equipment for producing compression foam, the advantage of which is the possibility of using it to extinguish fires in high-rise buildings, at low temperatures, as well as in the practice of extinguishing forest fires.

It is possible to get compression foam only from those vehicles that are equipped with this system. Fire engines available in garrisons in order to obtain compression foam need to be converted and mounted additional modules (compressor, control panel, tanks, dosing devices, etc.), which reduces the useful volume of their fire superstructure and, as a result, the performance characteristics . Currently, the re-equipment of the fire trucks in the garrisons with a compression foam supply system is not carried out, since changing (retrofitting) an existing fire superstructure requires significant financial costs. The commissioning of new fire fighting equipment, which has a facility for producing compression foam, is possible only for a long time period when the resource of existing vehicles is exhausted or the target program of the Russian Emergencies Ministry is created. In order to equip existing fire trucks and motor pumps with the function of producing compression foam, we propose a built-in installation for producing such foam.

The method includes supplying compressed air and a jet of a foaming agent solution under pressure, entrainment of the gas, followed by their mixing. By adjusting the pressure of the incoming solution in front of the device, it is possible to obtain a foam ratio in the range from 5 (low) to 50 (medium).

The known method adopted as a prototype RF patent No. 2456037, class. A62C 5/02, publ. 07/20/12. The method describes the continuous creation of foam by supplying compressed air and a solution of a foaming agent with water. The jet of the blowing agent and water is supplied under pressure and carries away the gas. Thus, the gas and the foaming solution are mixed and a foam is obtained.

The disadvantages of the method are:

- limited mobility and cumbersome installation. To obtain foam by this method and device, compressed air is supplied from compressors with large dimensions and requiring additional power sources. Therefore, installations with this method of creating foam are installed either stationary in the technical floors of buildings or in cars;

- compressed air enters the working chamber through a tip located in its center, which does not always allow to evenly distribute the incoming air flow in the supplied solution.

The objective of the utility model is to significantly increase the efficiency of pricing for one fire barrel, while increasing mobility and simplifying the design of the installation to create foam on one fire barrel without the use and presence of compressor units.

The problem is solved in that the installation is made in the form of an insert into a hose line with the possibility of using compressed air cylinders as a source of compressed air, moreover, compressed air for creating foam is supplied from replaceable cylinders used in breathing apparatus by fire departments, while the insert case is made in in the form of a pipe with a diameter of 75 mm with connecting heads of the GM-80 type with a flange connection at both ends, and an air duct connected to the unit’s casing is made with a diameter of 20 mm with m radial holes with a diameter of 3 mm on the inner part of the duct in the insert body, wherein compressed air is supplied to the working chamber through an installed air duct perpendicular to the body, having three rows of radial holes, which allow more uniform distribution of the incoming air flow in the direction the supplied solution over the entire cross section of the working chamber, and two grids with 5-6 mm cells are installed in the working chamber of the device, fixed by means of a thread inside the case with the possibility of replacing with others Gia with a different mesh size.

In FIG. 1 schematically shows an embedded mobile foam production unit (in section).

In FIG. 2 shows a diagram of connecting an embedded mobile installation to a production line.

In FIG. 3A and FIG. 3B schematically shows a section of the duct 3 with radial holes located thereon (side view - Fig. 3A) and (top view - Fig. 3B).

In FIG. 4A shows the construction of grids and their fastening in the working space of the installation (Fig. 4B).

In FIG. 5. presents the appearance of the built-in installation for the production of foam (prototype).

In FIG. 6 shows a photograph of the resulting foam of medium multiplicity from a manual fire barrel.

In FIG. 7. shows the resulting foam of medium multiplicity from the proposed installation for obtaining foam.

The installation (Fig. 1) includes an insert into the hose line in the form of a metal pipe with a length of about 500 mm, a diameter of 75 mm, at the ends of which connecting heads 1 and 2 of the GM-80 type are fixed for connecting pressure head fire hoses with a passage diameter of 77 mm. At a distance of 50 mm from the inlet channel 8 transverse to the flow of the flowing fluid with the foaming agent is an air duct 3 with a tip for connecting to it through a sleeve of an air supply hose, with a number of radial holes 4 directed at different angles to supply air to the working space 10 of the installation. To create a more uniform foam, two grids 5 and 6 are provided in the installation, which are fastened with an internal thread 7. These grids are located at a distance of 200 mm from the duct and at the same distance from each other and have a mesh size of 5-6 mm. The air duct 3 is configured to connect to it cylinders of compressed air through the tip.

The principle of operation of the device is as follows. A solution of a foaming agent and water in a predetermined concentration is fed into the inlet channel 8 under pressure. At the same time, compressed air is supplied through duct 3 from interchangeable cylinders 14 with a volume of 5 to 15 liters used in personal protective equipment for respiratory organs (hereinafter - RPD), which are evenly distributed through radial openings in the flow of the solution, forming a foam of a given multiplicity. Grids 5 and 6 with equal cell sizes provide a more uniform foam, which is removed from the working chamber 10 through the exhaust channel 9 into a manual fire barrel 17 and then to the fire extinguishing object.

In the pump 11 (Fig. 2), a solution of water and a foaming agent is formed with a given concentration and the required pressure, and then through the fire hose 12 with a diameter of 77 mm it is supplied to the installation 13. It is proposed to use fire trucks (tankers, fire pumping stations, etc.) as a pump. e.) or fire engine pumps, in which there is pumping equipment with the possibility of creating a foaming solution. Air for creating foam is used from interchangeable cylinders 14 connected through valves 19. The cylinders are used in breathing apparatus by fire departments. The air from the cylinders 14 is transported through a pipe 20 through a reducer 15 and a valve 18 to the installation 13. In the reducer 15, the pressure decreases to the required value in order to obtain the required foam ratio. Then, in the installation 13, a foam is created with the desired properties and enters the working fire hose line 16, also with a diameter of 77 mm, through which the foam is transported to the manual fire barrel RSK-50 (barrel "B") 17 with an outlet diameter of 13 mm, from whose foam is fed to the source of ignition.

In this scheme, it is proposed to use two cylinders 14 with their sequential operation. So, when air is consumed in one of the cylinders 14, for example, a valve 18 opens, which ensures uninterrupted air supply to the installation 13, and one valve 19 closes, which subsequently allows replacing an empty cylinder 14 with a full one. If necessary, the valves 18 and 19 can stop the air supply to the installation.

The air duct (Fig. 3A, Fig. 3B) is proposed to be made with a diameter of 20 mm, on which in three rows there are three holes with a diameter of 3 mm. The holes in the row are one in the direction of travel, and the other two across the fluid flow. The central row of holes is located in the center of the working space 10 of the installation, and the lower and upper rows are 25 mm from the central one.

Structurally, grids 5 and 6 (Fig. 4A) consist of a metal ring 21 with an outer diameter of 75 mm and a thickness of 3 mm, to which a grid 22 of wire 1-1.5 mm in diameter is attached. The mesh size is 5-6 mm. On the outer side of the ring there is a thread 23 through which the mesh is installed in the working space of the installation 10 (Fig. 4B) by twisting it along the internal thread 7 to their desired location with fixation.

The design dimensions of the foam production unit are: a length of the order of 500 mm, a diameter of 75 mm, the distance between the nets and the grid pitch, the diameter of the duct, the number of holes in it and their diameter are justified empirically and accepted as workable after experimental verification. The mass of the foam receiving insert, excluding cylinders, will be 2-3 kg.

According to the calculations and the experimental data for obtaining compression foam of medium multiplicity (multiplicity - K _p = 20) of one 7-liter SIZOD cylinder with a pressure of 290-300 atm. enough for 6-7 minutes of operation of one manual fire trunk RSK-50 (barrel "B") with a flow rate of 74 l / s on foam.

The appearance of the prototype of the embedded foam production unit is shown in FIG. 5. In FIG. Figure 6 shows a photograph of the resulting foam of medium multiplicity from a hand-held fire barrel using a built-in installation. The resulting medium foam is shown in FIG. 7, demonstrating the operability of the proposed design.

Claims (3)

1. Built-in installation for producing foam, including a housing with inlets of a solution of water with a foaming agent and air, characterized in that the installation is made in the form of an insert in a hose line with the possibility of using balloons with compressed air as a source of compressed air, and compressed air to create foam is supplied from replaceable cylinders used in breathing apparatus by fire departments, while the insert body is made in the form of a pipe with a diameter of 75 mm with connecting heads of the GM-80 type with a pin joint it at both ends, and a duct connected to the housing installation is made with a diameter of 20 mm arranged thereon radial holes 3 mm in diameter on the inside of the duct in the insert body. 2. The built-in foam production unit according to claim 1, characterized in that the compressed air is supplied to the working chamber through an installed air duct perpendicular to the housing, having three rows of radial openings, which allow the air flow to be more evenly distributed in the supply air to the sides solution over the entire cross section of the working chamber. 3. Built-in installation for producing foam according to paragraphs. 1 and 2, characterized in that in the working chamber of the device there are two grids with cells of 5-6 mm, fixed with a thread inside the case with the possibility of replacement with others with a different cell size.

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