RU120464U1 - FOAM GENERATOR INSTALLATION - Google Patents

Abstract

 A foam generator installation for preparing and injecting gas-mechanical foam during localization and extinguishing of underground fires, containing a foam generator with a pre-chamber and spray, a foam mixer, foaming agent, water and air supply hoses, taps and manometers, characterized in that the spray gun consists of a housing and an insert, and on the side the surface of the insert has grooves located at an angle of 45 ° to the horizontal axis to give the vortex direction of movement of the solution, and five holes are placed in the central part of the insert, about the bottom of which is central, the rest are located in diameter and drilled at an angle to the horizontal axis, in order to obtain a well-sprayed torch of the solution in the form of a continuous cone.

Description

The utility model relates to fire fighting equipment, namely, devices for the preparation and pumping of air-mechanical foam under pressure and can be used in the mining industry to equip rescue units, to localize and extinguish underground fires that occur in hard-to-reach places of mine workings.

A utility model is known comprising a housing with a prechamber having a bottom with nozzles for forming an air flow and an injector located in the housing for supplying a foaming solution to a mesh bag (Utility Model Patent No. 19763, published October 10, 2001).

Known pressure head foam generator, taken as a prototype, containing a housing with diffuse and embarrassing parts on the main pipeline, a prechamber having a bottom with sprayers for forming an air flow and an nozzle located in the housing for supplying a foaming solution to the mesh packet, material hoses for supplying a compressed foam generator gas, water and foaming agent, taps and manometers (utility model patent No. 82769, published May 10, 2009, bull. No. 13).

A disadvantage of the known utility models is that the nozzle for spraying a foaming agent solution has a structure that is difficult to manufacture and ineffective in operation. The foaming solution, passing through the nozzle of this design, is ejected under the pressure of water through the central hole into the foam generator and falls mainly in the middle of the cassette from the nets. The air entering through the openings in the bottom of the prechamber is directed to the peripheral sections of the cartridge and does not completely mix with the foaming agent solution, resulting in poor-quality, and therefore unstable foam.

The main characteristics of fire extinguishing foam are multiplicity and stability. The foam ratio is the amount of foam generated from a unit volume of the foaming agent solution. Very low multiplicity - less than 6, low - from 6 to 20, medium - from 20 to 200 and high - more than 200. The foam multiplicity depends on the brand of foaming agent, the amount of water and air and the equipment used. Foam resistance is the ability of a foam to retain its original properties. The stability of the foam usually does not exceed 2 hours, it depends on the content of the foaming agent, water, air and the temperature of the walls of the output.

To extinguish underground fires that occur in hard-to-reach places: voids behind the concrete lining of capital mine workings and chambers, domes in the roof of the mine and the mined-out space of coal seams, medium-sized foam is used, and high-frequency foam is used to quickly and efficiently fill vertical and inclined mine workings . The foam covering the burning surface blocks the access of air oxygen to it and has a cooling effect on burning materials and the walls of mine workings.

The technical result of the utility model is to increase the efficiency of extinguishing underground fires by producing high-quality foam of medium and high multiplicity.

This is achieved by the fact that in the installation for the preparation and pumping of gas-mechanical foam containing a foam generator with a pre-chamber and a spray gun, a foam mixer, foaming agent, water and air supply sleeves, taps and manometers, according to a utility model, the foam sprayer spray gun has a simple design and consists of a housing and inserts, on the lateral surface of which there are grooves located at an angle of 45 ° to the horizontal axis to give the vortex direction of the solution motion, and five are placed in the central part tversty, one of which - the center, the others are arranged in diameter and are drilled at an angle to the horizontal axis to obtain a well-atomized plume solution as a solid cone.

The essence of the utility model is illustrated by drawings, where in Fig. 1 shows a general view of the installation, in Fig. 2 - a foam generator, in Fig. 3 - a spray.

The device consists of a foam generator 1, a foam mixer 2, a supply hose of a foaming agent 3 with a filter 4 and a valve 5, a hose of water supply 6 with a connecting head 7, a crane 8 and a pressure gauge 9, an air supply sleeve 10 with a fitting 11, a crane 12 and a pressure gauge 13, a sleeve 14 supply of a foaming solution to the foam generator. The connecting head 7 is used to connect to the water supply, the nozzle 11 - to connect to the mine air duct or compressor. Through the filter 4, the foaming agent is sucked from the tank due to the vacuum created by the water pressure in the foam mixer 2.

The foam generator 1 includes a housing 15, equipped with a quick-detachable package of nets (cassettes) 16, prechamber 17, fittings 18 and 19 for supplying air and a foaming solution, a sprayer 20, a viewing window 21 and an adapter 22 for connection to the foam duct. The atomizer 20 consists of a housing 23 and an insert 24. On the insert body there are grooves A located at an angle of 45 ° to the horizontal axis. In addition, the insert contains five holes B, one of which is central, the rest are located in diameter and drilled at an angle to the horizontal axis. The presence of grooves on the insert body contributes to the formation of a vortex direction of movement of the foaming agent solution, and the holes divide the stream into smaller streams. As a result, the foaming agent is intensively mixed with water and a well-sprayed torch of the solution in the form of a continuous cone is evenly distributed around the entire perimeter of the cassette from the nets.

Below is the principle of operation of the device.

If it becomes necessary to prevent or extinguish, for example, an endogenous fire in a worked-out space, or to fill a vertical or inclined mine working with foam in order to prevent the spread of fire, wells are drilled from the surface of the mine, followed by casing with their pipes. A foam generator is connected to the casing and foam is injected into the fire source or into the output volume under pressure.

The working fluid during operation of the installation is water supplied to the system from the fire-irrigation pipe of the mine or a pump from an existing tank. Compressed air for foaming and transportation of foam is supplied from the air duct or from the compressor.

After installing the installation on the casing of the well and connecting to it a water supply, air pipe and hose from the container with a foaming agent, water is supplied to the device. Water passing through the foam mixer 2 creates a vacuum, with the help of which the foaming agent is sucked into the foam mixer. The resulting solution enters the foam generator 1, where, passing through the sprayer 20, it receives additional intensive mixing and enters the cassette from the nets 16. The formed torch of the solution in the form of a continuous cone is evenly distributed over the entire area of the cassette. At the same time, air is supplied through the openings in the bottom of the pre-chamber 17. A well-sprayed foaming agent solution and air passing through the nets of the cassette form a high-quality extinguishing foam. Foam through the casing of the well is fed to the fire or to the production. The pressure control of the gas-mechanical foam is carried out by a manometer 25.

The resulting high-quality foam effectively eliminates the resulting endogenous fire in hard-to-reach places, and is also able to quickly fill the space of a mine working to prevent the spread of fire through it.

Claims (1)

A foam generator installation for preparing and injecting gas-mechanical foam during localization and extinguishing of underground fires, containing a foam generator with a pre-chamber and spray, a foam mixer, foaming agent sleeves, water and air, taps and manometers, characterized in that the spray gun consists of a housing and an insert, and on the side the surface of the insert has grooves located at an angle of 45 ° to the horizontal axis to give the vortex direction of movement of the solution, and five holes are placed in the central part of the insert, about the bottom of which is central, the rest are located in diameter and drilled at an angle to the horizontal axis, in order to obtain a well-sprayed torch of the solution in the form of a continuous cone.