WO2017012601A1

WO2017012601A1 - Fire extinguisher

Info

Publication number: WO2017012601A1
Application number: PCT/DE2016/000261
Authority: WO
Inventors: Holger Jockel
Original assignee: Feuerschutz Jockel Gmbh & Co. Kg
Priority date: 2015-07-22
Filing date: 2016-06-30
Publication date: 2017-01-26
Also published as: EP3337576B1; EP3337576A1; DE112016003293A5

Abstract

A fire extinguisher comprises a ventilation chamber (21) at the end of the extinguishing mixture duct (6, 15) which is part of the fire extinguisher and from which the mixture of fire extinguishant and foaming agent (extinguishing foam) exits in the foamed state when the fire extinguisher is used. At the periphery, said ventilation chamber is provided with air holes (26) in a cross-sectional plane (ventilation plane). Air is sucked in as a result of the fact that the inner cross-section of the ventilation chamber is constricted by a collar (27), a wire mesh (29) below the ventilation plane. The orifice of the ventilation chamber (21) is equipped with a wire mesh.

Description

extinguisher

The invention relates to a fire extinguisher according to the preamble of claim 1.

He has an extinguishing agent container, from which the extinguishing mixture is passed as a mixture of an extinguishing agent and additional liquids in an outlet channel when using the fire extinguisher, and a mixing device in which the extinguishing mixture is mixed with air and foamed.

Such a fire extinguisher according to the preamble of claim 1 is as

Hand fire extinguisher known from EP2666519A2 and DE 42 24 891 A1.

Its peculiarity is that the additional liquids - referred to in this application as a foaming agent (foaming agent) - are stored in secondary containers and also that the secondary containers are arranged in the extinguishing agent container. The extinguishing agent container is filled with the extinguishing agent, e.g. Water filled with some additives. The foaming agents are added to the extinguishing agent for foaming only in case of fire.

For this purpose, the auxiliary tank when using the fire extinguishing system via a

Inlet valve directly or via the extinguishing agent container with a pressurized gas source-e.g. a print cartridge that is filled with CO2, connected and pressurized. As a result, a valve device opens on the secondary container and the foaming agent pours into the extinguishing agent container and mixes with the extinguishing agent, e.g. Water.

As a result, the extinguishing agent container is pressurized. When opening the -z.B. Manual extinguishing valve to extinguish a fire, the extinguishing mixture is ejected as extinguishing foam.

But there are also fire extinguishers in use, in which the foaming agent is mixed with the extinguishing agent in the extinguishing agent container and through

Pressurization of the extinguishing agent container is driven as a ready mixed extinguishing mixture in the extinguishing mixture channel.

It is known that the extinguishing mixture of extinguishing agent and foaming agent by pressurization by a pressurized gas (nitrogen or carbon dioxide)

Extinguishing agent container and secondary containers or the extinguishing agent container expelled and sprayed as extinguishing foam on the fire site. The compressed gas is referred to in this application as a propellant.

CONFIRMATION COPY For foam formation particularly suitable are the foam-forming surfactants, for example

Fluorine surfactants. However, these are particularly harmful and should not get into the sewage or groundwater. However, they have been indispensable so far to achieve a good extinguishing performance that meets the requirements.

Extinguishing foam should have a certain coherence and stability, so that the fire is stifled and can not be "burned" by the applied foam carpet, one tries to improve the foaming, this is mainly the interposition of air.

According to DE 202005010 596 U1, the secondary container, which is arranged on the extinguishing hose, is designed as an injector in the manner of a Venturi nozzle

Zumischeinrichtung connected to the leading from the container to the outlet opening of the extinguishing hose flow channel or connectable. This will result in addition to the additive, i. in this application the foaming agent, also air in the

Flow channel and extinguishing hose entrained and the extinguishing mixture from

Extinguishing agent, foaming agent and air generated in the flow channel. This is applied as extinguishing foam on the fire site. This works; However, the properties of the foam, in particular throw, volume and stability are not satisfactory, if the use of surfactants should be completely dispensed with.

DE 100 10 141 C1 describes that extinguishing foam for firefighting is produced by the extinguishing mixture is treated by means of compressed air.

For this purpose, a motor-driven centrifugal pump and a compressed air compressor is used according to US-A 5,255,747, which is not practical for smaller and especially mobile equipment.

From US-A 5,881,817 a quenching apparatus is known in which the extinguishing mixture in the mixing device admixed from a compressed air source compressed air stream is mixed and processed into extinguishing foam.

Also, if the use of compressed air in all the drawbacks for the size and mobility of such equipment opens up foaming advantages, the unsatisfactory quality of the foam produced in the systems known from the prior art is due to inadequacies of the mixing device n. DE 202013009111 U1 describes a mixing device for

Extinguishing foam preparation, in which project from the scope of the mixing device from several supply channels into the interior of the mixing chamber. As a result, a plurality of jets of a compressed gas are blown into the inner region of the extinguishing mixture stream. Here, the distribution of air over the cross section of the extinguishing mixture is limited by the number of supply channels, so that the foaming is insufficient.

DE 202011 052455 U1 describes the mixing device according to the preamble of claim 1. It is used for the production of compressed air foam and is placed on the outlet opening of the extinguishing mixture channel. In her the extinguishing mixture is passed behind the extinguishing agent inlet (2) through a perforated plate with several openings (5). As a result, the extinguishing mixture flows through divided into several individual streams. Air inlet openings for the compressed air are in a radially oriented cross-sectional plane of the mixing device, referred to in this application as aeration level, in the interior of the mixing device and the split

Directed extinguishing mixture stream.

This blending device for producing compressed air foam requires the presence of a compressed air source, in particular a pressure bottle, which is filled with air or another suitable high pressure gas of e.g. 100bar is loaded.

The object of the invention is, without the use of surfactants and in particular fluorine as well as without the use of a pressure of more than 50bar gas to increase the foaming and in particular to ensure that with sufficient throw a thick impenetrable foam carpet on the

Fire site, e.g. let the surface of a burning liquid lay.

The solution results from claim 1.

On the one hand a good mixing of the components-extinguishing agent, foaming agent and air- on the other hand, a significant increase in volume of the foam and finally a stabilization of the foam is guaranteed. In particular, the developments of the subclaims are characterized by simple, robust design and surprising effectiveness and lead in their selection and summation to an unexpected optimization of foam formation. Compared to the mixing device according to DE 20 2011 052455 U1 not only the advantage that no provision of a compressed air source is required. It is particularly important that the mixing device is divided into two and consists of the mixing chamber and the ventilation chamber placed thereon, wherein ambient air is supplied to the extinguishing mixture stream without further technical aids through the ventilation chamber. As a result, there are no space restrictions to arrange a largest number of air holes on the circumference of the jacket of the ventilation chamber. As a result, the multiple split extinguishing mixture stream on its whole

Cross-section of air flows through and the air is trapped as a plurality of air bubbles in the extinguishing mixture when it is combined in the extinguishing foam outlet (3) again into a closed jet of extinguishing foam.

The extinguishing agent and the foaming agent can be stored in the extinguishing agent container of the fire extinguisher as a finished extinguishing mixture or else separately from each other, in particular claim 5.

The mixing chamber, which is set to the outlet opening of the extinguishing mixture channel, serves - especially in the development according to claim 8 - the production of a plurality of individual streamlines, which are interrupted and relocated again and again in the flow direction. The result is a kind of turbulent flow of the extinguishing mixture with an unlimited number of spaces between the current filaments and interruptions of the current filaments in the current direction with the finest distribution in

Current direction and over the entire cross section of the extinguishing mixture stream.

Thereby, the ventilation chamber at the mouth of the mixing chamber can be particularly effective in the mixing of ambient air in the form of finely divided

Air bubbles. The air holes in the jacket of the ventilation chamber may be formed as cylindrical holes or as a circulating in the ventilation plane narrow slot.

To generate the negative pressure and suction of the ambient air is the

Flow rate of the expelled by the expanding propellant gas extinguishing mixture (extinguishing mixture) increased by the flow path is narrowed below the ventilation level of the ventilation chamber, in particular by a collar (claim 2). The extinguishing mixture tends by its cohesion, even on a short

Flow path to reunite. This will be followed by the measure

Claim 3 prevented. The arranged in a radial plane of the aeration chamber, the cross-section filling close-meshed wire mesh fulfills a multiple function: On the one hand, it forms the narrowing of the flow path, which is used to generate the

Negative pressure of the extinguishing mixture is required; On the other hand, this wire grid leads to a loosening on the entire cross section of the extinguishing mixture,

Volume increase, increase the flow velocity and thus to

Amplification of the negative pressure.

The foam formation according to the invention is supplemented and reinforced by a further measure according to claim 4. It serves to further increase the volume of the now already foamed extinguishing mixture by their further mechanical

Loosening, which in turn is associated with an increase in the exit velocity. For this purpose, a wire mesh with intersecting metal or plastic wires is placed in the radial plane of the mouth of the ventilation chamber.

In the embodiment according to claim 5 and 6, a large expansion of the propellant gas and thus also a relative to the amount of extinguishing agent-small propellant gas volume is made possible.

By the measures according to claim 7, the division of the extinguishing mixture of extinguishing agent and foaming agent is increased such that from the individual jets finally a turbulent flow of this extinguishing mixture and an additional mixing is formed. Here, the housing inner cross-section of the mixing chamber in several radial planes through hole plate en (32, 33) is filled, the

Repeated incoming extinguishing mixture stream repeatedly divided into individual jets and give these individual jets of the turbulence and mixing conducive direction. Thus, especially the first flowed through a variety of in the flow direction

extending holes in fine distribution and a following perforated plate with also uniformly distributed holes whose axes have a directional component in the direction of flow, but are inclined to, in the limit case in a concentric cylinder axis of the mixing chamber cylinder level, or even with an additional radial direction component radially inward or radially outward. In the following the invention will be described by means of exemplary embodiments.

Show it:

1 is a longitudinal section through a fire extinguisher (without extinguishing valve)

Fig. 2, 3 and 4 detail views of the exhaust valve with attached ventilation chamber

4A supervision of the cap sleeve of Figure 4

In old drawings, the same reference numerals are used for similar parts. The description applies to all figures, unless special features of a single figure are explicitly highlighted.

FIG. 1 shows a fire extinguisher with a fire extinguisher with the extinguishing agent container 1.

This pressure-resistant container 1 of the hand-held fire extinguisher has a circular-cylindrical open neck 2. In this neck fits the collar 4 of a closure head 3, which is pressure-resistant manner by means of a clip, not shown, on the container 1. The closure head 3 has a hose nozzle 5 for attaching the extinguishing hose 15 with the attached metering valve in this application throughout as

Extinguishing valve 10 referred to. The hose connection is via outlet 6 and

Riser 7 connected to the interior of the container. The riser 7 extends substantially to the bottom of the container, so that the container can be completely emptied.

The container 1 is filled with the extinguishing agent, e.g. Filled with water. He is pressurized by a print cartridge 8, in which a pressure fluid / propellant is stored. The print cartridge 8 is mounted in the mouth of a pressure channel 9 on the closure head such that it protrudes into the container with the closure head.

To open the print cartridge 8 - as here only schematically indicated - a valve plate which closes the print cartridge 8, destroyed by means of a percussion plunger 11. The percussion ram is guided in alignment with the central axis of the print cartridge 8 and to the also aligned rising branch 13 of the pressure channel sliding and sealing at the same time in the closure head.

The pressure channel 12 is guided in the closure head U-shaped. On his free

Mouth is a pressure tube 9 is set, which with the filling opening 19 of the

Sub-tank 14 via an inlet valve -not shown- is connected pressure-resistant. The inlet valve is a check valve which is opened by spring pressure in its closed position and by pressurizing the pressure tube 9 (or the inner extinguishing agent container).

On its other outlet side 22 of the secondary tank 14 is closed by a valve device 23, here a predetermined breaking point, down.

The predetermined breaking point is created by a weakening of the jacket, which propagates in particular on a generatrix. At internal pressure of the sub-tank 14, the sub-tank opens to the outside here.

The secondary container 14 has on its back along a common generatrix a recess and forms on its circumference a constriction 20. Der

Sub-tank 14 nestles with the indentation to the riser 7 and is fastened in the region of these constrictions by means of a cable tie 20 to the riser 7.

To the function:

When the pestle 11 is knocked down in the manual fire extinguisher, the rupture disk (not shown) is broken and the print cartridge 8 is opened.

The predetermined breaking point of the secondary container 14 is now designed so that it opens under the now emerging pressure. As a result, the liquid -that is

Aufschäummittel- expelled from the secondary tank in the extinguishing agent tank, where they mix with the extinguishing agent. Also, the extinguishing agent container is pressurized.

The secondary container contains the foaming agent. Fluorinated surfactants, which greatly reduce the surface tension of the water and on the one hand have excellent foaming properties and have a good extinguishing effect, but on the other hand damage the water, especially the groundwater, during extinguishment, were used for this purpose. Preference is therefore given to the use of fluorine-free foaming, but their foaming and extinguishing effect is worse, if they are not optimized by the mixing device according to the invention.

Alternatively to the preparation of the extinguishing mixture of extinguishing agent and foaming agent by storage of the foaming agent in a sub-tank, the foaming agent can also be added to the extinguishing agent immediately and as a finished mixture in the

Extinguishing agent containers are filled. This alternative is particularly suitable for permanent pressure extinguishers on, in which the extinguishing agent container is placed after filling with the extinguishing mixture by filling with a suitable pressure medium / propellant gas under continuous pressure. This alternative is also suitable for Aufladelöscher, in which the pressure means / propellant gas-as also described above- in a

Cartridge stored inside or outside of the extinguishing agent container and the print cartridge is opened only in case of fire in the extinguishing agent container and the already finished extinguishing mixture is expelled.

In the case of the three alternatives described, the mixture of the extinguishing agent and the foaming agent is in any case when the extinguishing agent container is pressurized

(Extinguishing mixture) supplied through hose 15 to the extinguishing valve 10 which is operated by a handle -opened and closed. By opening, the

Extinguishing mixture to be sprayed on the fire site. In the case of fluorine-free foaming agents, a further treatment of the extinguishing mixture of extinguishing agent and foaming agent is carried out to improve foaming. It must be remembered that the extinguishing mixture forms a laminar flow substantially. It is therefore pre-empted a mixing device, which consists of the mixing chamber 18 and the ventilation chamber 21 placed thereon. The extinguishing mixture leaves this mixer as a foam.

It has been found that the foam still has a substantially worse extinguishing effect than when using fluorine-containing surfactants as foaming agents, when the extinguishing mixture stream is divided into individual streams in the mixing chamber and discharged in this form. The resulting foam dissolves over the burn site, e.g. burning liquid surface - thus has a lack of stability - and is not sufficient with its thickness to choke the flame - so has too little volume per unit weight-.

Surprisingly, it is possible by mixing this inadequate foam with ambient air in the subsequent ventilation chamber 21, the stability of the

Foam and the volume and thus its covering ability to increase so much that the quality of a compressed air mixture at pressures over

100bar processed foam is achieved or exceeded.

In itself, the intake of ambient air to the extinguishing agent does not seem advised, since there is a risk that form in the extinguishing mixture large air caverns, which rather than prevent flame formation. However, it has been found that the air bubbles are so finely distributed in the foam and so firmly integrated by the inventive measures, and that the

Soaking up of the fire site by the firmer and thicker foam carpet is so good that the distribution of air bubbles in fine distribution is not detrimental.

This jacket is firmly clipped to the outlet of the mixing chamber 18 by axially projecting hook 25, which has an outer collar on the circular cylindrical

Just overlap mixing chamber.

The shell is provided on its circumference in a cross-sectional plane (ventilation level) with air holes 26. The inner cross-section of the jacket of the ventilation chamber is below -d.h .: so narrowed upstream of the ventilation level that this

Narrowing has a venturi-like effect and by increasing the

Flow velocity in the area of the air holes creates a vacuum of less than atmospheric pressure which leads to the intake of the ambient air.

In Fig. 2, this constriction is designed as a circumferential collar 27, which has the effect of increasing the flow rate while reducing the static pressure in the extinguishing mixture stream. The resulting negative pressure pulls the

Outside air / ambient air through the air holes 26 a.

By this interference of air in the finest possible distribution increases

Volume of the exiting foam so considerably that the disadvantage of

Non-use of Flurhaitigen surfactants is substantially canceled.

A further increase in volume is achieved by the wire mesh 29, which is placed on the orifice 30 of the circular cylindrical housing of the ventilation chamber 21 and clamped by means of screw ring 31 on a small circumferential on the inner circumference of the shell collar.

The wire mesh 29 consists of thin, less than 1 mm thick wires of metal or plastic, which are laid with a density between 15 and 40 meshes, preferably 20 to 35 meshes per square inch to a rectangular grid. In this case, the cross section of the ventilation chamber 21 is between 20 and 50qmm, e.g. 35qmm.

This wire mesh 29 has the function, the exiting with air bubbles

Enriched foam jet to further mix and loosen up. It works but above all as a cross-sectional constriction and caused with the simultaneous increase in volume of the foam and an increase in the exit velocity and thus the throw of the foam.

In the embodiment according to FIG. 3, instead of the venturi-type constriction (27), a mesh 29 filling the jacket cross-section, preferably a wire mesh, occurs as a constriction. The wire mesh 29 consists of thin, less than 1 mm thick wires of metal or plastic, which are laid with a density between 15 and 40 meshes, preferably 20 to 35 meshes per square inch to a rectangular grid. In this case, the cross section of the ventilation chamber 21 is between 20 and 50qmm, e.g. 35qmm.

This grid corresponds in its design to the grating 28. However, it has at this point the function to divide the emerging from the mixing chamber 18 foam jet, to swirl and increase in volume. This increase in volume leads, in addition to the above-described effect of the cross-sectional constriction, to a further increase in the flow velocity and the resulting flow

Under pressure. The stronger suction of the outside air / ambient air through the air holes 26 in the longitudinal and transverse columns of the extinguishing mixture thus creates a finer distribution of air bubbles in a finer distribution of air bubbles a permanent, stable increase in volume of the extinguishing foam, which also during spraying on the fire preserved.

To form the slot 26, the mixing chamber 18 with the jacket 24 of

Ventilation chamber 21 connected such that the front edge of the mixing chamber 18 and the opposite rear edge of the ventilation chamber 21 this circumferential gap 26 release. On the free rear end of the cylindrical shell 24 of the

Ventilation chamber 21 is a cap sleeve 34 by thread pairing 35th

screwed. The cap sleeve 34 extends beyond a cylindrical in the axial direction

Extension 36, which has the mixing chamber 18 at its front free end and which forms the front edge of the mixing chamber 18. The cap sleeve 34 has at its free end the circumferential hook 25, which engages behind the outer diameter stage of the cylindrical extension 36. At the inner cylindrical

Diameter stage of the cylindrical extension 36 is a thread into which a clamping sleeve 37 with its external thread can be screwed. The Clamping sleeve 37 clamps by screwing to the stop the wire mesh 29 against the radial surface of the diameter step of the cylindrical extension 36th

To connect the slot 26 to the atmosphere, the diameter of the

Outer circumference of the cylindrical extension 36 smaller than the inner circumference of the cap sleeve 34 and also forms the rotating hook 25 paraxial

Passages 39, as the plan view of Fig.4A shows. It arises on the

Outer periphery of the extension 36 is a cylindrical gap which connects the slot 26 with the atmosphere.

The mixing chamber 18 has in all the described embodiments essentially the function to break the laminar flow of the extinguishing mixture into individual jets to divert these individual jets from the flow direction and to break it up into smaller pieces, drops, strands.

The cylindrical housing of the mixing chamber 18 is set on the one hand to the outlet of the extinguishing valve 10 and on the other hand by the own outlet with the

Ventilation chamber 21 -as previously described- connected. The cylindrical one

Housing inner cross-section is filled in several radial planes by perforated plates 32, 33 which lie in the flow behind each other.

For this purpose, the holes may be distributed differently, e.g. in several

be distributed concentric rings on their perforated plates. These rings can have different diameters from perforated plate to perforated plate, so that the rays of the first perforated plate do not hit holes of the second perforated plate. The holes of the second orifice plate may and preferably have a direction different from the axial direction, and are preferably inclined with respect to the axial direction in the circumferential direction inclined, in the second orifice plate preferably different and

opposite to the orientation on the first perforated plate.

The holes of the perforated plate 32 are directed in the flow direction and distributed uniformly over the surface of the perforated plate. Perforated plates 32 divides the incoming

Extinguishing agent mixture stream in single jets.

The holes of the downstream following perforated plate 33 are directed in the direction of flow and in addition also more or less transverse to it and evenly distributed over the surface of the perforated plate 33, but less than the number of holes.

Perforated plate 32. Perforated plate 33 divides the incoming single rays on further, directs them and split them into shorter pieces. Perforated plate 33 thus serves to give these individual jets a direction conducive to swirling and mixing and to chop them up.

The ventilation chamber By the described measures according to this invention, a foam carpet is produced without the use of fluorine-containing surfactants, which lays on the fire, especially on burning liquid levels, and is so firm that at a few centimeters thickness of the foam layer, the flames are permanently stifled.

It has been found that the foam formation depends on the flow rate of the extinguishing mixture of extinguishing agent and foaming agent. These

Flow velocity is known to depend on the volume expansion of the

Propellant gas off; It is therefore necessary to have a sufficiently large volume of propellant gas-related to the volume of the extinguishing mixture or the

To provide extinguishing agent container. However, this will reduce the amount of

Löschgemischs reduced, which is detrimental to the Löscherfolg. According to the invention, it is therefore desirable, by using suitable propellant gases, to keep the volume of propellant gas relative to the volume of extinguishing agent small, and indeed so small, that the volume before expansion is between 2% and 4% of the volume of the extinguishing agent. This can be achieved, above all, by using nitrogen as the propellant, which is up to the

Discharge in a print cartridge, preferably stored in the extinguishing agent container -see the description of FIG.

reference numeral

Extinguishing agent container 1

open neck 2, opening, circular cylindrical opening of the extinguishing agent container closure head 3

Bund, Ansatz4

Hose nozzle 5

Outlet channel outlet channel outlet connection extinguishing mixture channel 6

Riser 7

Print cartridge, compressed gas cylinder, compressed gas source 8,

Pressure pipe 9

Outlet valve extinguishing valve Dosing valve 10

Impact tappet emergency valve 11

U-shaped pressure channel 12

ascending branch 13 of the pressure channel

Cartridge, secondary container 14

Hose 15

....1

18 mixing chamber vortex nozzle

19 filling opening, inlet connection 19

20 tape, cable ties 20

21 aeration chamber 21

22 floor 22

23 outlet valve, valve device predetermined breaking point 23

24 jacket 24 rotary body

25 hooks 25

26 air holes 26

27 Federation 27

28 wire mesh 28

29 wire mesh 29

30 estuary estuary 30

31 screw ring 31 32 perforated plate 32

33 perforated plate 33

34 cap sleeve 34

35 thread 35

36 Extension 36

37 thread 37

38 clamping sleeve 38

39 cylindrical paraxial passage 39 qmm = mm ²

qcm = cm ²

Claims

claims

1. Fire extinguisher

• with an extinguishing agent container for the extinguishing agent and a container for a

foaming,

• with an outlet channel (6), which is connected to the extinguishing agent tank and in which the extinguishing mixture of extinguishing agent and foaming agent at

Use of the fire extinguisher is expelled by pressurizing the extinguishing agent container by means of a propellant gas,

With a mixing device through which the extinguishing mixture is guided and which comprises

o behind the extinguishing agent inlet (2) a perforated plate with a plurality of holes (5) through which the extinguishing mixture flows and is thereby divided into a plurality of individual streams,

o air inlet openings (1) in a ventilation plane oriented as a radial cross-sectional plane, directed into the interior of the mixing device,

o an extinguishing foam outlet (3),

characterized in that

the mixing device is in two parts and has:

+ a mixing chamber (18) which is placed on the end of the discharge channel (6) connected to the extinguishing hose (15), and

+ a ventilation chamber (21) formed as a hollow cylinder (rotary body) mantle, which on the one hand the mouth of the mixing chamber (18) is placed, and which on the other hand serves as an extinguishing foam outlet,

the perforated plate with perforations (5) lies in the mixing chamber (18) such that the extinguishing mixture flows into the aerating chamber (21) divided into individual streams,

that as the air inlet openings a wreath of many, in any case more than 3 air holes or a circumferential slot (26) on the circumference of the shell in the

Ventilation level of the aeration chamber (21) is arranged,

that the air holes or the circumferential slot (26) connect the interior of the shell with the ambient air and conduct sucked air jets in the aeration level on the divided into individual streams extinguishing mixture, the shell inner cross section of Ventilation chamber (21) between the ventilation level and perforated plate has a cross-sectional constriction,

and in that the extinguishing foam outlet (3) is the attachment of the aeration chamber (21) directed to the point of fire, through which the extinguishing mixture in the foamed state is sprayed as extinguishing foam.

2. Fire extinguisher according to claim 1

characterized in that

The constriction of the jacket inner cross-section of the ventilation chamber (21) is a Venturt-like constriction by a collar (27) surrounding the inner circumference. The fire extinguisher according to claim 1

characterized in that

the constriction is a grid (29) filling the jacket cross-section of the ventilation chamber (21), preferably wire mesh of metal or plastic wires, whose mesh size is in the range between 15 and 40 / cm 2, preferably 25 to 35 mesh / cm 2. Fire extinguisher according to claim 1,

characterized in that

the mouth of the ventilation chamber (21) with an outlet cross section of the

Muzzle filling grid (28), preferably wire mesh of metal or

Plastic wires is, the mesh size in the range between 15 and 40 / qcm is preferably 25 to 35 mesh / qcm.

5. Fire extinguisher according to claim 1,

characterized in that

the propellant is stored until used in the extinguishing agent container in a pressurized print cartridge whose volume is 1/10 to 1/60 of the volume of the extinguishing agent and preferably in the range between 2% and 4% of the volume of the extinguishing agent.

6. Fire extinguisher according to claim 1,

characterized in that

the propellant is nitrogen.

7. Fire extinguisher according to claim 1,

characterized in that

the housing inner cross-section of the mixing chamber (18) in several radial planes by perforated plates (32, 33) is filled, which lie in the flow behind each other and divide the incoming extinguishing mixture into individual jets and give these individual jets of the turbulence and mixing conducive direction, the Holes of the successive perforated plate en (32, 33) are preferably not aligned and preferably have different direction from radial plane to radial plane.