SU1498510A1 - Air-foam fire-hose barrel - Google Patents

Abstract

The invention relates to fire fighting equipment designed to extinguish and protect with air-mechanical foam and spray jets. The purpose of the invention is to simplify the design, increase reliability, and expand the functionality of an air-foam barrel. The barrel consists of a body nozzle 1 with a conical narrowing 2 and a cylindrical part 3 nozzle. In the case of the nozzle 1 there is a paddle insert 4, and in the cylindrical part 3 the nozzle has an annular groove 5 connected to the atmosphere with openings 6. On the case of the nozzle 1 by means of fastener 7 a removable barrel casing 8 having a rectangular cross-section is attached. 3 hp ff, 1 ill.

Description

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The invention relates to fire fighting equipment, in particular to the field where spray jets and air-mechanical foam are used to extinguish, which are obtained by means of portable and 5 fixed air-foam trunks.

The purpose of the invention is to simplify the design, increase the reliability of operation and expand the functionality of an air-foam stem.

The drawing shows the structure of an air-foam stem.

Air-foam barrel consists of a body 1 nozzle with a conical taper 2

The shape of the cross section of the casing is determined by its purpose and technological capabilities. For example, to extinguish and supply fire extinguishing agent in narrowness, it can be rectangular or square with small roundings. In the general case, the shape of the casing, in contrast to the cylindrical shape, should provide a variable distance from the axis of the jet to its walls.

The jet coming out of the cylindrical part of the body strikes against the walls of the casing 8 of the barrel of a polygonal section. Since the distance from the axis of the casing to its walls is different (in contrast to the cylinder 20

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and the cylindrical part 3 In the coring pipe), already at the initial start 1 there is a paddle insert 4, and in the cylindrical part 3 of the nozzle there is an annular groove 5 connected to the atmosphere by the openings 6. On the case 1 the nozzle is attached by fastening 7 having a polygonal sectional shape.

Air-foam barrel works as follows.

The frother solution, entering the nozzle body 1, emerges from it in the form of a jet with a small angle of opening and is crushed. When this jet ejects air through the holes 6 to the annular groove 5, which contributes to the fragmentation of the jet into smaller droplets and to obtain a homogeneous foam.

The shape of the jet and the nature of the spray, mainly determined by the parameters of the blade insert, the angle of inclination of its blades, shape and size. In addition, an important factor affecting the range of foam supply is the linear velocity of the exiting jet, depending on the resistance that the paddle insert of the fluid passing through it exerts. To obtain the highest possible 30

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In the area of the hull multiple impacts of individual droplets occur, which leads to intense turbulence and the formation of a foam jet with a shorter stem length. The ability to easily remove the casing and spray jet parameters (delivery range) allow the use of an air-foam barrel not only to extinguish the foam, but also to extinguish and protect it with sprayed water jets. This is especially important in conditions of a limited supply of fire extinguishing agents. In comparison with the known, the proposed air-foam barrel is easy to manufacture and has greater operational reliability and enhanced functionality, which expands the operational and tactical capabilities of fire departments.

Claims (4)

Claim 1. Air-foam barrel comprising a nozzle body with a conical constriction in front of the output cylindrical part and a barrel housing is distinguished by the fact that, in order to simplify the design and increase reliability, before the conical constriction in the body the nozzle has a speed of minimum Q novla liner, made in the form of logs of the nozzle body, it is advisable that the total area of the aperture of the blade liner is 4-6 times greater than the area of the output nozzle, i.e. ZSnpox (4-6) Zsopla, Evening 2 P was 45-90 °. In the central part of the liner there is an opening, the diameter of which is 0.6-0.9 dc. The presence of an orifice with a diameter within the specified limits has a positive effect on the increase in the rate of jet outflow and at the same time does not prevent its stable opening, exceeding this ratio leads to a decrease in the foam multiplicity, and with smaller values the effect is not observed. 45 50 pastel asterisks with a central hole, and in the cylindrical part of the nozzle an annular groove connected with channels to the atmosphere is formed. 2. A barrel according to claim 1, characterized in that the barrel housing in cross section has a polygonal shape. 3. Barrel on PP. 1 and 2, characterized in that the ratio between the diameter of the central hole of the liner and the diameter of the cylindrical part of the nozzle is in the range of 0.6-0.9. 4. Barrel on PP. 1-3, characterized in that, in order to expand the functionality, the barrel housing is volumetric. The shape of the cross section of the casing is determined by its purpose and technological capabilities. For example, to extinguish and supply fire extinguishing agent in narrowness, it can be rectangular or square with small roundings. In the general case, the shape of the casing, in contrast to the cylindrical shape, should provide a variable distance from the axis of the jet to its walls. The jet coming out of the cylindrical part of the body strikes against the walls of the casing 8 of the barrel of a polygonal section. Since the distance from the axis of the casing to its walls is different (as opposed to a cylindrical pipe), then already at the initial primary pipe) In the area of the hull multiple impacts of individual droplets occur, which leads to intense turbulence and the formation of a foam jet with a shorter stem length. The ability to easily remove the casing and spray jet parameters (delivery range) allow the use of an air-foam barrel not only to extinguish the foam, but also to extinguish and protect it with sprayed water jets. This is especially important in conditions of a limited supply of fire extinguishing agents. In comparison with the known, the proposed air-foam barrel is easy to manufacture and has greater operational reliability and enhanced functionality, which expands the operational and tactical capabilities of fire departments. Claims 1. An air-foam barrel comprising a nozzle body with a conical constriction in front of the outlet cylindrical part and a barrel housing is distinguished by the fact that, in order to simplify the design and increase the reliability of operation, before the conical constriction the nozzle is installed in the nozzle body. form lo5 0 pastel asterisks with a central hole, and in the cylindrical part of the nozzle an annular groove connected with channels to the atmosphere is formed. 2. A barrel according to claim 1, characterized in that the barrel housing in cross section has a polygonal shape. 3. Barrel on PP. 1 and 2, characterized in that the ratio between the diameter of the central hole of the liner and the diameter of the cylindrical part of the nozzle is in the range of 0.6-0.9. 4. Barrel on PP. 1-3, characterized in that, in order to expand the functionality, the barrel housing is volumetric.