RU2021534C1 - Foam generator - Google Patents

Abstract

FIELD: foam generators. SUBSTANCE: foam generator has cone 6 and tie-rods 8. Part of foam generator body between compressed air inlet 2 and sprayer 3 has throat 5. Cone 6 is freely installed in body 1 for longitudinal motion and rigidly connected with steam generating net by means of tie-rods. EFFECT: higher efficiency. 1 dwg

Description

 The invention relates to the mining industry and can be used to extinguish underground fires in remote places.

 Known foam generator, comprising a housing in the form of a diffuser, a spray and a packet of nets.

 However, such a foam generator cannot be used to pump foam through pipelines, since it is of the ejection type (air is ejected from the surrounding area by a sprayed blowing agent) and the outlet pressure is insufficient to supply foam through the pipelines. Such foam generators work, as a rule, to drain.

 The closest to the claimed technical essence and the achieved result is a known foam generator, comprising a housing with a nozzle for supplying compressed gas, a foam generator grid and a spray.

 A disadvantage of the known foam generator is the low efficiency of extinguishing underground fires. This is explained as follows. The foam obtained with the help of this foam generator with a multiplicity of K = 100-150 does not provide filling of the domes and the upper part of the mine workings, which reduces the effectiveness of fire prevention and suppression.

 With an increase in the multiplicity of the foam (over 150) in the known foam generator, an intermittent (with air jams) foam flow is formed. This is due to the fact that as the length of the foam stream in pipelines or wells increases, the backpressure of the foam generator increases, that is, the pressure drop across the irrigation nozzle decreases, which leads to a decrease in flow rate and a decrease in the opening angle of the spray nozzle of the foaming solution. Moreover, the surface of the foam-generating mesh is not completely covered by the foaming solution, as a result, the foaming process is disrupted. With a further increase in backpressure, the foaming process generally stops. Fire fighting efficiency is reduced.

 The aim of the invention is to increase the extinguishing efficiency by ensuring the possibility of obtaining a continuous stream of high-foam.

 This goal is achieved in that the foam generator, comprising a housing with a nozzle for supplying compressed air, a foam generator grid and a spray, according to the invention, is equipped with a cowl and rods, while the part of the housing between the pipe for supplying compressed air and a spray is made with a neck, the cowling is rigidly connected to the grid by means of rods and installed in the housing with the possibility of longitudinal movement.

 As a result of patent research, no known technical solutions were found having features similar to those distinguishing the claimed solution from the prototype.

 The drawing schematically shows a General view of the foam generator.

 The proposed foam generator consists of a housing 1 with a nozzle 2 for supplying compressed gas, a spray 3, a foam generator 4. A part of the housing 1 between the nozzle 2 and the spray 3 is made with a neck 5, the outlet of which is fitted with a fairing 6 with a spring 7, rigidly connected by rods 8 with foam mesh. In the initial position, the fairing 6 overlaps the output section of the neck 5. The fairing and the mesh connected to it can freely move in the longitudinal direction.

 Thanks to this technical solution, when changing the back pressure of the foam flow in the pipeline, the amount of gas supplied to the grid is controlled by moving the fairing and closing the passage through the neck and irrigating the entire surface of the foam grid when the spray angle of the spraying foam is changed by approaching or removing the foam grid from the sprayer.

 The proposed foam generator works as follows.

 Compressed gas through the pipe 2 enters the foam generator and due to the high-pressure gas pressure, the fairing 6 and the foam generator networks 4 are displaced along the axis, compressing the spring 7. Foaming solution is supplied to the foam generator networks 4. This ensures irrigation of the nets over the entire surface. A high-rate gas-mechanical foam is formed, which is supplied through a small section pipe or through wells to a fire source.

 As the length of the foam stream increases, backpressure in the pipeline (well) increases, which leads to a decrease in the gas pressure head, correspondingly to a decrease in pressure drop and flow rate at the spray gun, and, consequently, a decrease in the opening angle of the spray nozzle of the foaming solution. This reduces the force acting on the fairing 6 and the mesh 4, as a result of which, under the action of the spring 7, the fairing and the mesh (rigidly interconnected by rods 8) move toward the neck and spray 3.

 There is a overlap in the neck section, which ensures the regulation of the amount of gas supplied, and the approach of the grids 4 to the atomizer 3 provides irrigation of the entire surface of the grids. As a result, the foaming process is not disturbed.

 EFFECT: invention ensures continuous production of highly multiple foam, which ultimately increases the extinguishing efficiency.

Claims (1)

 FOAM GENERATOR, comprising a housing with a nozzle for supplying compressed air, a foam generator grid and a sprayer, characterized in that, in order to increase the extinguishing efficiency due to the possibility of obtaining a continuous flow of high-foam foam, it is equipped with a cowl and rods, while part of the housing between the nozzle for supplying compressed air and a spray is made with a neck, the fairing is rigidly connected to the grid via rods and installed in the housing with the possibility of longitudinal movement.