Classifications

• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62C—FIRE-FIGHTING
  • A62C31/00—Delivery of fire-extinguishing material
  • A62C31/02—Nozzles specially adapted for fire-extinguishing
  • A62C31/05—Nozzles specially adapted for fire-extinguishing with two or more outlets
  • A62C31/07—Nozzles specially adapted for fire-extinguishing with two or more outlets for different media

Definitions

• the invention relates to a device for producing foam foam with a nozzle body having an injector nozzle and a foam tube which surrounds the nozzle body and has a foam outlet opening on one of its end faces and an inlet opening on the opposite end face with a larger diameter than the foam outlet opening.
• Devices of this type are used in stationary or mobile fire-extinguishing devices in order to stifle a fire through a foam if, for example, the use of water as a liquid is not possible.
• a device for producing foam is known from British Patent 1,018,431.
• the device described in this document has a foam tube which surrounds a nozzle body with a cylindrical section.
• the nozzle body has a nozzle from which liquid is discharged.
• the known device has an inlet opening on its rear face.
• several sealing openings are distributed over the cylindrical circumference of the foam tube.
• the liquid exiting from the nozzle body is swirled in the known device by pins connected to the nozzle body, so that it foams in the larger cross section of the foam tube. It has been shown, however, that the extinguishing foam produced by means of the known device cannot bridge long throw distances and its adhesion to a fire surface is only limited.
• the associated limited wetting ability has the consequence that the with the foam produced by the known device has only a reduced extinguishing capacity.
• the object of the invention is to provide a device for producing extinguishing foam which has improved adhesion and can bridge large throwing distances.
• the flow of the resulting foam can be stabilized by a cylindrical foam tube section adjoining the tapering foam tube section.
• a second tapering foam tube section which adjoins the cylindrical foam tube section in the flow direction, makes it possible to further compress the foam.
• a compressed foam is advantageous in many cases because it is also compact due to its compactness Influence of larger kinetic energies does not fall apart and can thus bridge larger throw distances.
• Another, second cylindrical foam tube section which adjoins the second tapering foam tube section in the flow direction, also serves to stabilize the foam flow.
• this second cylindrical foam tube section makes it possible to precisely specify the direction of the emerging foam jet.
• the foam pipe according to the invention can be used particularly advantageously in connection with extinguishing devices in which the extinguishing liquid is under high pressure, i.e. at pressures above 40 bar. It should be particularly emphasized that the foam tube also leads to a considerable improvement in the throw of the extinguishing agent jet emerging from it when the extinguishing agent is not mixed with a foam-generating additive, but only the extinguishing liquid itself emerges from the foam tube as a jet of high kinetic energy.
• the use of the foam tube designed according to the invention for pure liquid extinguishing is advantageous when, for example, a directed jet of extinguishing liquid is required in order to reach the source of the fire from a greater distance.
• the extinguishing liquid jet concentrated through the foam tube can be used to achieve a wetting of embers nests hidden deep inside the fire source by means of a targeted jet.
• the total length of the foam tube is three to four times as large as the inlet opening of the foam tube. This length leads to a well-foamed, compact foam that can bridge long throw distances.
• a foam tube of this length is easy to handle.
• the nozzle body supported by support elements on the walls of the foam tube, sits in the foam tube. In this simple way, a compact, easy-to-manufacture unit can be formed.
• the support elements are molded onto the nozzle body. This applies in particular if the support elements are formed in one piece with the nozzle body. In this way, an easy to manufacture, low-maintenance design of the device is provided.
• the extinguishing liquid emerges from the nozzle openings of the nozzle body and swirls due to the sudden widening of the cross section. This swirling causes the extinguishing liquid to foam.
• the nozzle body has a chamber upstream of the nozzle opening in the flow direction. This enables a pre-swirling of the extinguishing liquid, which is concentrated by the limited cross section of the nozzle opening and swirled again when it emerges from the nozzle opening. In this way, an even finer distribution of the foam pores is achieved.
• the nozzle body has a central nozzle opening. With this arrangement, the extinguishing liquid flows out on the center line of the foam tube in a streamlined manner and is given sufficient space for foaming in all directions.
• the injector nozzle has an orifice arranged upstream in the flow direction of the nozzle opening. This applies in particular if the nozzle opening and the aperture opening only partially overlap. This partial overlap creates a so-called tear-off edge, which leads to increased swirling of the extinguishing liquid.
• a number of diaphragm openings are arranged on a circle around a common central axis of the diaphragm and the nozzle body, and the extinguishing liquid emerges from the nozzle opening in small vortices, resulting in greater mixing with the surrounding medium being sucked in, and thus further improved foaming given is.
• the invention is based on a
• FIG. 2 shows the foam tube according to FIG. 1 in an enlarged axial section
• FIG. 3 shows the foam tube in a cross section along the section line X-X indicated in FIG. 2;
• 5 shows an extinguishing nozzle element in an axial section
• 6 shows the extinguishing nozzle element according to FIG. 5 in a frontal view
• the foam tube 12 has a first section 13 which, starting from an inlet opening of the large diameter D 1 assigned to the extinguishing nozzle head 1, tapers conically and merges into a first cylinder section 14 with a constant diameter D 2.
• a second tapered section 15 adjoins the first cylinder section 14 and merges into a second cylinder section 16.
• the constant diameter D3 of the cylinder section 16 corresponds to the diameter of the foam outlet opening 17 of the foam tube 12.
• a nozzle body 18 which is held coaxially to the longitudinal axis L of the foam tube 12 by means of webs 19 which are integrally formed thereon and are supported on the wall of the section 13. Between the webs 19 and the nozzle body 18 there are suction openings 20, through which ambient medium, mainly air, is drawn from the environment into the foam tube 12.
• the nozzle body 18 has an end face 21, from which an injector nozzle 22 is molded into the nozzle body 18.
• the bore of the injector nozzle 22 opens into a chamber 23 which, starting from the side opposite the end face 20, is formed in the nozzle body 18.
• An external thread 30 is formed on the outside of the walls of the nozzle body 18 surrounding the chamber 23, via which the foam tube 12 is screwed to a sleeve 29.
• an orifice plate 24 which has two nozzle bores 25, 26.
• the nozzle bores 25, 26 are partly from the injector nozzle 22 of the nozzle body 18 covers so that the nozzle bores 25, 26 of the orifice plate 24 are only partially released and the sharp edge 27 of the edge of the injector nozzle 22 is arranged in each of the nozzle openings 25, 26.
• the foam tube 11 can be screwed onto the external thread 11 of an extinguishing nozzle element 4, which is seated in a receptacle 3 of an extinguishing nozzle head 1 formed centrally on the end face 2, via the sleeve 29, which is provided with an internal thread at each end, on both ends .
• the extinguishing nozzle element 4 has a central extinguishing nozzle 6 arranged on its free end face 5.
• a circumferential inclined surface 1 b adjoins the end face 2 of the extinguishing nozzle head 1, on which are arranged mist generation nozzles 1 c.
• three additional nozzles 7a, 7b, 7c are positioned on a circle K at a short distance a from the central extinguishing nozzle 6 at regular angular intervals a, the nozzle bores of which run parallel to the bore of the central extinguishing nozzle 6.
• the diameter of the additional nozzles 7a, 7b, 7c is smaller than the diameter of the central extinguishing nozzle 6.
• the central extinguishing nozzle 6 and the additional nozzles 7a, 7b, 7c are connected to a chamber 8 which, starting from the end face arranged opposite the end face 5, is molded into the extinguishing element 4.
• the chamber 8 has a section 8a assigned to the mouths of the bores of the central extinguishing nozzle 5 and the additional nozzles 7a, 7b, 7c, the walls of which taper conically at an angle in the direction of the bore mouths.
• a hexagon 9 is formed at a distance from the end face 5 on the extinguishing nozzle element 4, on which an assembly tool, not shown here, can be attached.
• an external thread 10 is also formed on the extinguishing nozzle element 4, by means of which the extinguishing nozzle element 4 is screwed into a correspondingly designed thread of the receptacle 3.
• a further external thread 11 is present in the section between the hexagon 9 and the end face 5 of the extinguishing nozzle element 4.
• Extinguishing liquid enriched with foaming agent reaches the chamber 8 of the extinguishing nozzle element via a channel 28 of the extinguishing nozzle head 1. From there it penetrates into the bores of the central extinguishing nozzle 6 and the additional nozzles 7a, 7b, 7c and emerges as parallel jets from the central extinguishing nozzle 6 and the additional nozzles 7a, 7b, 7c.
• the jets emerging from the additional nozzles 7a, 7b, 7c support the jet emerging from the central extinguishing nozzle 6, so that the jets can together bridge a long throw.
• the jets emerging from the additional nozzles 7a, 7b, 7c provide a spray pattern which has four concentrated extinguishing points on an area enlarged compared to a single jet, which points correspond to the distribution of the central extinguishing nozzle 6 and the additional nozzles 7a, 7b, 7c on the extinguishing nozzle element 2 are arranged.
• the jets divided in this way are swirled in the chamber 23 of the nozzle body 18 and reach the injector nozzle 22 via the nozzle bores 25, 26.
• the jets formed from already atomized jets and passing through the nozzle bores 25, 26 continue swirls, so that on the injector nozzle 22 from finely divided drops of high kinetic energy fog spray enters the foam tube 12.
• This fog jet sucks ambient air in the manner of a Venturi nozzle through the suction openings 20 into the foam tube 12, so that the extinguishing liquid forms a foam with the additives mixed into it. Due to the fine atomization of the extinguishing liquid, this foam has a particularly fine-pored nature. The fine-pored extinguishing foam emerges from the foam tube 12 and is thrown in the direction of the source of the fire due to the high kinetic energy. Extinguishing foam of this type has a high level of adhesion, so that it reliably wets the fire area and has a high extinguishing capacity.
• the mist generation nozzles lc can, if necessary, be supplied with extinguishing fluid by means of a suitable valve device, also not shown.
• the resulting water mist not only provides targeted cooling of the fire environment, but also provides effective protection for the firefighter. At the same time, it does not influence the behavior of the extinguishing foam, since on the one hand the fog is applied in a direction different from that of the extinguishing foam and on the other hand the kinetic energy inherent in the extinguishing foam is greater than that of the fog.

Landscapes

• Health & Medical Sciences (AREA)
• Public Health (AREA)
• Business, Economics & Management (AREA)
• Emergency Management (AREA)
• Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
• Nozzles (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7880808

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Citations (4)

Family Cites Families (6)

• 1998
  • 1998-09-11 DE DE1998141876 patent/DE19841876C2/de not_active Expired - Fee Related
• 1999
  • 1999-09-13 WO PCT/EP1999/006757 patent/WO2000015302A1/de not_active Application Discontinuation
  • 1999-09-13 EP EP99948748A patent/EP1112109A1/de not_active Withdrawn
  • 1999-09-13 JP JP2000569886A patent/JP4316811B2/ja not_active Expired - Fee Related

Patent Citations (4)

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