BE1028042A1 - FIRE EXTINGUISHING NOZZLE AND EXTINGUISHER - Google Patents

Abstract

A first aspect of the present invention relates to a fire extinguisher nozzle comprising a mixing chamber, a ventilation chamber and a foaming chamber, wherein said ventilation chamber comprises a first hollow cylindrical body having at least three holes in it. As an air inlet, said foaming chamber comprises a second hollow cylindrical body having an axial length (L) and an inner diameter (d), and said ventilation chamber and / or said foaming chamber comprises a mesh, in which the ratio between axial length and internal diameter (L: d) is between 4: 5 and 9: 5 to extinguish class A fires, or between 6: 1 and 10: 1 to extinguish class B fires. second and third aspect relate respectively to a fire extinguisher comprising a fire extinguishing composition and a fire extinguisher nozzle, and to the use of a fire extinguisher or extinguisher to extinguish the class fires e A or class B.

Description

FIELD OF THE INVENTION The present invention relates to fire extinguishing equipment. More particularly, the invention relates to fire extinguishing nozzles.

BACKGROUND Fire extinguishing compositions generally contain mixtures of surfactants which act as foaming agents, together with solvents and other additives which provide the desired mechanical and chemical properties to the foam. There is a general desire to improve the foaming characteristics of known fire extinguishing compositions, in order to obtain a fire extinguishing process which is faster, more efficient, and in particular, specifically adapted to the environment. a certain class of fires. One way to improve the foaming characteristics of fire extinguishing compositions is to modify the composition itself. For this purpose, fluorinated surfactants have long been used to improve foaming properties, but they have recently been monitored for environmental safety reasons. Another way to improve the foaming characteristics is by modifying the discharge equipment, namely the extinguisher that is used. For example, EP 3,337,576 describes a fire extinguisher comprising a nozzle with a plurality of perforated plates for influencing the foaming characteristics of a fire extinguishing composition. The effect of these "hardware modifications" on foaming, however, is quite small, resulting in limited performance, especially for extinguishing Class A and B fires. Accordingly, there remains a need in the art for a. fire extinguisher which drastically improves the foaming characteristics of fire extinguishing compositions, and which can improve the extinguishing performance of class - A or B fires, regardless of the fire extinguishing composition used.

The present invention aims to solve at least some of the problems and drawbacks mentioned above. SUMMARY OF THE INVENTION The present invention and embodiments thereof serve to provide a fire extinguisher nozzle suitable for extinguishing Class A or Class B fires according to claim 1. The nozzle d The fire extinguishing according to the present invention has the advantage of improving the foaming characteristics of a fire extinguishing composition. It is argued that, by using the nozzle according to the present invention, the foaming characteristics of a fire extinguishing composition are changed so that the fire extinguishing composition can be optimally used for extinguishing. Class A or B fires quickly and efficiently.

Preferred embodiments of the fire extinguisher nozzle are set out in any of claims 2 to 11.

In a second aspect, the present invention relates to an extinguisher according to claim 12. Dependent claim 13 describes a preferred embodiment of said extinguisher.

A final aspect of the present invention relates to the use of a fire extinguisher nozzle or extinguisher as described herein for extinguishing class A or class B fires, according to claim 14. Dependent claim 15 describes a preferred embodiment of said use.

FIGURES Figure 1 shows a perspective view of one embodiment of a fire extinguisher nozzle according to the present invention, which nozzle comprises a single indivisible body.

Figure 2 shows a perspective view of an embodiment of a fire extinguisher nozzle according to the present invention, which nozzle comprises a single indivisible body.

Figure 3a shows a perspective view of one embodiment of an assembled fire extinguisher nozzle according to the present invention, which nozzle comprises three separate and / or removable parts.

Figure 3b shows a perspective view of one embodiment of a dismantled fire extinguisher nozzle according to the present invention, which nozzle comprises three separate and / or removable parts.

Figure 4a shows a perspective view of one embodiment of an assembled fire extinguisher nozzle according to the present invention, which nozzle comprises three separate and / or removable parts.

Figure 4b shows a perspective view of one embodiment of a dismantled fire extinguisher nozzle according to the present invention, which nozzle comprises three separate and / or removable parts.

Figure 5 shows a perspective view of one embodiment of a ventilation chamber according to the present invention.

Figure 6 shows a perspective view of one embodiment of a ventilation chamber and a foaming chamber according to the present invention, which ventilation and foaming chambers form a single indivisible body.

Figure 7 shows a perspective view and a cross-sectional entry view of one embodiment of a mixing chamber according to the present invention.

Figure 8 shows a sectional representation along an axial central axis of an embodiment of a ventilation chamber according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fire extinguishing nozzle suitable for extinguishing class A or class B fires. Although the nozzle according to the present invention can be used for extinguishing fire. fires of all fire classes, the advantages described here focus primarily on fire classes A and B.

Unless otherwise indicated, all terms used in the disclosure of the invention, including technical and scientific terms, have the meaning as commonly understood by those skilled in the art to which this invention belongs. As further assistance, definitions of terms are included in order to better understand the teaching of the present invention. As used herein, the following terms have the following meanings: The terms "a", "a" and "the" and "the" as used herein denote both singular and plural referents, unless the context clearly states otherwise. By way of example, “a compartment” designates one or more compartments.

The term "about", as used herein with reference to a measurable value, such as a parameter, quantity, time duration, etc., is intended to encompass variations of +/- 20% or less, preferably +/- 10% or less, more preferably +/- 5% or less, still more preferably +/- 1% or less, and still more preferably +/- 0.1% or less, of and from the specified value, insofar as such variations are appropriate to occur in the disclosed invention. However, it should be understood that the value to which the modifier "about" refers is itself also specifically described.

Reciting number ranges by end points includes all numbers and fractions included in that range, as well as recited end points.

In a first aspect, the present invention relates to a fire extinguisher nozzle suitable for extinguishing class A or class B fires. The fire extinguisher nozzle described herein comprises a mixing chamber, a chamber. ventilation chamber and a foaming chamber. The mixing chamber is configured to introduce a flame retardant composition inside the nozzle. The ventilation chamber is coupled to said mixing chamber and comprises a first hollow cylindrical body having at least three air inlet holes. Said air inlet holes are arranged on the circumference of the first hollow cylindrical body and are directed therein, wherein said ventilation chamber is configured to introduce ambient air into the nozzle and then to mix said air. ambient with flame retardant composition. The foaming chamber of the nozzle includes a second hollow cylindrical body having an axial length (L) and an inner diameter (d), and is coupled to the ventilation chamber. Here, the foaming chamber is configured to allow the formation of fire extinguishing foam. Further, the ventilation chamber and / or the foaming chamber comprises a mesh, wherein said mesh is oriented in the radial plane of the inner cross section of the ventilation chamber and / or the foaming chamber. The fire extinguisher nozzle as described herein is characterized by the ratio of the axial length to the inner diameter (L: d) of the foam chamber. Said ratio is between 4: 5 and 9: 5 for extinguishing class A fires, or is between 6: 1 and 10: 1 for extinguishing class B fires. Active fire used to extinguish or control small to medium-sized fires, often in emergency situations. Typically, an extinguisher consists of a cylindrical, hand-held pressurized container containing a fire-extinguishing composition that can be discharged in order to extinguish a fire. An extinguisher as described herein includes a "fire extinguisher nozzle", also referred to as a "nozzle", which is a device for controlling the direction or characteristics of a fluid flow. In light of the present invention, the fluid flow is a fire extinguishing composition. Regarding the terminology "class of fire" according to standard EN 2, there are six classes of fires. “Class A” fires refer to fires in solid fuels, primarily solids of an organic nature such as charcoal, wood, paper and fabrics. "Class B fires" refer to fires in flammable liquids, such as gasoline, petroleum, tars, oils, oil-based paints and solvents. "Class C fires" indicate fires in flammable gases, such as hydrogen, propane, butane or methane.

"Class D fires" specifically relate to combustible metals, in particular alkali metals such as lithium, sodium and potassium, alkaline earth metals such as magnesium, and group 4 elements such as titanium and zirconium. “Class F fires” refer to fires in cooking oils and fats, for example kitchen fires.

The nozzle described here comprises a mixing chamber, a ventilation chamber and a foaming chamber, in which the formulations "mix",

"Ventilation" and "foaming" specifically indicate the function performed by said chambers.

As such, they function respectively to (pre) mix a fire extinguishing composition in the nozzle, to allow ventilation and / or aeration of the fire extinguishing composition, and to - optimize the performance. foaming process, namely the production of fire extinguishing foam from the liquid fire extinguishing composition as supplied to the mixing chamber.

The term "mesh" as described herein refers to a barrier made of connected metal wires, fibers or other flexible or deformable materials.

A mesh can also be called a "sieve". Trellises are generally characterized by their "mesh opening," particularly their "U.S. mesh opening," which is defined as the number of openings in one square inch of a mesh.

For example, a 36 mesh screen will have 36 openings per square inch.

By the nature of this expression, however, the average diameter of the openings depends on the thickness of the connected wires.

In light of the present invention, the mesh opening is preferably expressed as a micron value indicating the average diameter of the mesh openings.

For example, a mesh opening of 1000 µm indicates a mesh in which the average diameter of the openings is 1000 µm.

The term "axial length" represents the length of a cylindrical body along its axis of rotation.

Therefore, the "inner diameter" is measured in the plane perpendicular to the axis of rotation and extends along the inside of the cylindrical - hollow body.

The fire extinguishing nozzle according to the present invention has the advantage of improving the foaming characteristics of a fire extinguishing composition for situations of class A fires or of class B fires.

As for the fire extinguisher nozzle where the L: d ratio is between 4: 5 and 9: 5, it is observed that the discharged fire extinguishing foam is less compact in nature and is more thinner than fire extinguishing foams which are discharged from nozzles generally known in the art.

This is particularly advantageous for Class A fires, where fire extinguishing foam should be applied to the surface of a burning material, which should be covered as quickly and as completely as possible.

In general, when denser foams provide slower spread of fire extinguishing foam over a burning object, the fire extinguisher nozzle according to the present invention allows faster spread of fire extinguishing foam. 'fire extinguishing, which allows the very efficient and very rapid extinguishing of class A fires. As regards the fire extinguisher nozzle where the ratio L: d is between 6: 1 and 10 : 1, it is observed that the discharged fire extinguisher foam is more compact in nature and is thicker than the fire extinguishing foams which are discharged from nozzles generally known in the art. This is particularly advantageous for Class B fires, since the fire extinguishing foam is intended to form a substantial layer on top of the surface of the burning liquid. The resulting compact and thick foam layer is able to better contain the flames in a certain area, and thus prevent further spread of the fire. Further, the contact between the burning liquid and the surrounding air is effectively reduced and / or suppressed, which allows the burning liquid to be extinguished more quickly. As a result, it is argued that the fire extinguishing nozzle described here allows more efficient and faster extinguishing of Class A or B fires. The foaming characteristics of a fire extinguishing composition are changed. so that the fire extinguishing composition can be optimally used to extinguish class A or B fires in a rapid and efficient manner.

Preferably, said ratio between the axial length and the internal diameter (L: d) of the foaming chamber is between 4: 5 and 8: 5 for extinguishing class A fires, or between 7: 1 and 9: 1 for extinguishing Class B fires. Within the preferred ranges described herein, a wide variety of fire extinguishing compositions result in the formation of two distinct extinguisher foams which exhibit the optimum foaming characteristics for Class A fires or class B, respectively. In some embodiments, said ratio between the axial length and the internal diameter (L: d) of the foaming chamber is between 4: 5 and 9: 5, preferably between 4: 5 and 8: 5 to quench Class A fires. In some embodiments, said ratio between the axial length and the internal diameter (L: d) of the foaming chamber is between 6: 1 and 10: 1, preferably between 7: 1 and 9: 1 to extinguish class B fires.

According to another embodiment or a further embodiment, said axial length (L) of the foaming chamber is between 10.0 and 30.0 mm for extinguishing class A fires, or between 100.0 and 170.0 mm for extinguishing class B fires.

Preferably, the axial length (L) of the foaming chamber is between 11.0 and 29.0 mm for extinguishing class A fires, or between 110.0 and 160.0 mm for class B fires. Said ranges of the axial length (L) of the foaming chamber have been found to be particularly effective for extinguishing class A or class B fires. Moreover, with regard to the connectivity of the nozzle to fire extinguishers d fire extinguisher and / or extinguisher tubes commonly available on the market, said axial length (L) ranges provide optimum ratios between axial length and internal diameter (L: d), compatible with most extinguishers. and / or known fire extinguisher tubes. In some preferred embodiments, the axial length (L) of the foam chamber for extinguishing Class A fires is between 12.0 and 28.0 mm, between 13.0 and 27.0 mm, between 14 , 0 and 26.0 mm, or between 15.0 and 25.0 mm. In some preferred embodiments, the axial length (L) of the foam chamber for extinguishing class B fires is between 110.0 and 150.0 mm, between 120.0 and 140.0 mm, between 121, 0 and 139.0 mm, between 122.0 and 138.0 mm, between 123.0 and 137.0 mm, between 124.0 and 136.0 mm, or between 125.0 and 135.0 mm. According to another embodiment or a further embodiment, said mesh has a mesh opening of between 700 and 1200 µm. It is argued that the mesh opening has an impact on various foaming characteristics, such as discharge time, discharge rate, foam expansion, size of foam bubbles, discharge angle of foam, etc. The inventors have found that the range of mesh openings disclosed herein strike a good balance between all of the above foaming characteristics. In particular, the small meshes generate a foam with a smaller bubble size, which is beneficial for the control of hydrocarbon fires, for example. However, by using a smaller mesh opening, the amount of foam expansion is reduced, which is sub-optimal when it comes to extinguishing Class B fires. On the other hand, the use of larger mesh opening increases the amount - of foam expansion and improves the angle of foam discharge, while the resulting bubble size is sub-optimal for class A fire suppression A mesh opening of between 700 and 1200 µm provides all of the advantages mentioned above, and allows the nozzle as described herein to further optimize foam characteristics for Class A or Class B fires.

In the context of the present invention, in particular when the fire extinguisher nozzle as described herein is to be used in the presence of energized electrical equipment, reference is made to the terminology "dielectric test". A "dielectric test" indicates a test which verifies the ability of an extinguisher to extinguish a fire on a live electrical device without inflicting damage and / or endangering the operator of the extinguisher. During this dielectric test, the electrical conductivity of the liquid flow is measured, which electrical conductivity preferably remains within a given limit. The appropriate limits and measurement methods for dielectric tests are subject to national or regional regulation and / or standardization, for example EN 3-7: 2007-10: "Portable fire extinguishers - Part 7: Characteristics, performance requirements and test methods ”. It is argued that the fire extinguisher nozzle as described here has the additional advantage of passing EN 3-7: 2007-10 dielectric tests, and therefore can be used without danger for fire extinguishing. class A or class B where energized electrical equipment is present.

Preferably, said mesh has a mesh opening of between 800 and 1100 µm. More preferably, said mesh has a mesh opening of between 900 and 1100 µm, even more preferably between 950 and 1050 µm, between 960 and 1040 µm, between 970 and 1030 µm, between 980 and 1020 µm, or between 990 and 1010 µm.

According to another embodiment or a further embodiment, the interior cross section of the ventilation chamber comprises a cross-sectional narrowing. The term "cross-sectional constriction" herein refers to all technical means of limiting the cross-sectional area through which a fire extinguishing composition can flow freely. Due to this restriction, the liquid flow through the ventilation chamber exhibits a higher velocity and increased turbulence, whereby the mixing of the fire extinguishing composition and the ambient air is improved. Due to this better mixing, the expansion of the foam and the size of the foam bubbles of the resulting foam are further optimized for Class A or Class B fires. Preferably, said cross-sectional narrowing is D-shaped. 'Venturi type constriction, which induces a venturi effect inside the first hollow cylindrical body of the ventilation chamber, thus sucking air through the air inlet holes of the ventilation chamber. A better mixing of the fire extinguishing composition and the ambient air is obtained, which further improves the foam characteristics of the resulting fire extinguishing foam. In some embodiments, the cross-sectional constriction has a minimum internal diameter between 6.0 and 14.0 mm, preferably between 7.0 and 13.0 mm, preferably between 8.0 and 12.0 mm, even more preferably between 10.0 mm and 9.0.

According to another embodiment or a further embodiment, the mixing chamber comprises at least two narrowed inlet holes which further improve the speed and turbulence of the liquid flow before entering the ventilation chamber. . Said narrowed entry holes preferably have an opening diameter of between 0.5 and 2.0 mm, more preferably between 0.6 and 1.5 mm, even more preferably between 0.7 and 1.2 mm.

Other embodiments or additional embodiments of the invention relate to a nozzle, wherein the mixing chamber includes an elongated outlet. The elongated outlet is configured such that it effectively guides a fire extinguishing composition within and / or at least midway through the ventilation chamber. Said configuration allows optimum mixing of the fire extinguishing composition and the ambient air which is drawn through the air inlet hole of the ventilation chamber, which further improves the characteristics of the foam for class A or class B fires. Preferably, said elongated outlet opening extends at least partially beyond the air inlet holes. In some embodiments, said elongated outlet port has the shape of a circular truncated cone, which allows for even better mixing of the fire extinguishing composition and the ambient air.

According to another embodiment or a further embodiment, the elongated outlet port has an inner diameter of between 6.0 and 12.0 mm, preferably between 7.0 and 11.0 mm, more preferably between 7 , 0 and 11.0 mm or between 8.0 and 10.0 mm.

According to another embodiment or a further embodiment of the present invention, the mixing chamber, the ventilation chamber and the foaming chamber form a single indivisible body. Here, the nozzle as a whole determines its applicability for extinguishing Class A or Class B fires. A person using the nozzle does not need to perform adaptation and / or assembly of separate parts and can Directly couple the nozzle as such to a fire extinguisher, saving valuable time when extinguishing a Class A or Class B fire in an emergency situation.

According to another embodiment or a further embodiment, the mixing chamber, the ventilation chamber and the foaming chamber comprise at least two distinct and / or removable parts of the nozzle. This allows the mixing and adaptation of separate and / or removable parts, thus adapting the nozzle to specific fires and / or emergency situations. Preferably, the mixing chamber, the ventilation chamber and the foaming chamber comprise three distinct and / or removable parts of the nozzle.

In a second aspect, the present invention relates to a fire extinguisher comprising a fire extinguisher composition, said fire extinguisher is provided with a nozzle, wherein said nozzle is a nozzle according to any of the preceding embodiments. . The extinguisher as described here has all of the advantages already discussed, and optimizes speed and efficiency when Class A or Class B fires can be extinguished.

Preferably, said fire extinguishing composition is free from fluorine. In general, non-fluorinated fire extinguishing compositions are preferred over fluorinated compositions, as fluorinated compositions have recently been under surveillance for environmental safety reasons. However, fire extinguishing compositions generally contain fluorinated compounds, for example as surfactants, which serve as foaming agents in order to impart the desired mechanical and chemical properties to the foam. This is particularly the case in the light of category A or B fires. The extinguisher as described here now allows the formation of a foam of comparable or even better quality, using an extinguishing composition = d fluorine-free fire.

A third aspect concerns the use of the fire extinguisher nozzle or fire extinguisher as described here for the extinction of class A or class B fires, having all the advantages already discussed.

Particularly with regard to Class A fires, it is observed that the discharged fire extinguisher foam is less compact in nature and is thinner than the fire extinguishing foams which are discharged through the nozzles of fire extinguishers. fire extinguishing or extinguishers generally known in the art.

This is particularly advantageous when the fire extinguishing foam is to be applied to the surface of a burning material, which should be covered as quickly and as completely as possible.

Particularly with regard to class B fires, it is observed that the discharged fire extinguisher foam is more compact and thicker than the fire extinguishing foams which are discharged through fire extinguisher nozzles. fire extinguishers or extinguishers generally known in the art.

This is particularly advantageous since the fire extinguisher foam is intended to form a substantial layer on top of the surface of the burning liquid.

The resulting compact and thick foam layer is able to better contain the flames in a certain area, and thus prevent further spread of the fire.

Further, the contact between the burning liquid and the surrounding air is effectively reduced and / or suppressed, which allows the burning liquid to be extinguished more quickly.

It is argued that the present use allows more efficient and faster extinguishing of Class A or B fires.

The foaming characteristics of a fire extinguishing composition are modified so that the fire extinguishing composition can be optimally used to extinguish Class A or B fires in a rapid and efficient manner. effective.

Notwithstanding that the present use of the nozzle as described herein greatly improves the foam characteristics of all fire extinguishing compositions, a preferred use relates to said fire extinguishing compositions which are fluorine free.

Although fire extinguishing compositions generally contain fluorinated compounds in order to provide the desired mechanical and chemical properties to the foam, the use of the fire extinguisher nozzle or fire extinguisher such as as described herein now allows the formation of a foam of comparable or even better quality using a fluorine-free fire extinguishing composition.

DESCRIPTION OF THE FIGURES The following description of the figures of specific embodiments of the invention is purely illustrative and is not intended to limit the present teachings, their application or their uses.

In all the drawings, corresponding reference numerals denote identical or corresponding parts and features.

Figure 1 shows a perspective view of an embodiment of a fire extinguisher nozzle 1 according to the present invention, which nozzle 1 comprises a single indivisible body.

Nozzle 1 is particularly useful for extinguishing class A fires and should be understood as having an inlet a and an outlet b.

Here, the inlet a is to be coupled to a fire extinguisher and the outlet b is for the passage through which the fire extinguisher composition is discharged.

The nozzle 1 includes a mixing chamber 2, a ventilation chamber 3, and a foaming chamber 4. Notwithstanding that the mixing chamber 2, the ventilation chamber 3, and the foaming chamber 4 are formed as one body. indivisible, the ratio of the axial length to the internal diameter (L: d) of the foaming chamber 4 is unambiguously determined to be between 4: 5 and 9: 5. The ventilation chamber 3 has four air inlet holes 6, which allows contact between the ambient air and the fire extinguishing composition passing through the nozzle 1. For ease of coupling and / or for decoupling the nozzle 1 with an extinguisher or an extinguisher hose, an external thread 12 is provided at the level of the inlet a.

Using the nozzle 1 described herein, the discharged fire extinguisher foam is less compact in nature and is thinner than the fire extinguishing foams which are discharged from nozzles as are generally known in the art. .

This is particularly advantageous for Class A fires, where fire extinguishing foam should be applied to the surface of a burning material, which should be covered as quickly and as completely as possible.

Figure 2 shows a perspective view of an embodiment of a fire extinguisher nozzle 1 according to the present invention, which nozzle 1 comprises a single indivisible body.

Nozzle 1 is particularly useful for extinguishing - class A fires and should be understood as having an inlet a and an outlet b.

Here, the inlet a is to be coupled to a fire extinguisher and the outlet b is for the passage through which the fire extinguisher composition is discharged.

The nozzle 1 includes a mixing chamber 2, a ventilation chamber 3, and a foaming chamber 4. Notwithstanding that the mixing chamber 2, the ventilation chamber 3, and the foaming chamber 4 are formed as one body. indivisible, the ratio of the axial length to the internal diameter (L: d) of the foaming chamber 4 is unambiguously determined to be between 6: 1 and 10: 1. The ventilation chamber 3 has four air inlet holes 6, which allows contact between the ambient air and the fire extinguishing composition passing through the nozzle 1. For ease of coupling and / or for decoupling the nozzle 1 with an extinguisher or an extinguisher hose, an external thread 12 is provided at the level of the inlet a. By using the nozzle 1 described herein, the discharged fire extinguisher foam is more compact and thicker than the fire extinguishing foams which are discharged from nozzles as are generally known in the art. This is particularly advantageous for Class B fires, since the fire extinguishing foam is intended to form a substantial layer on top of the surface of the burning liquid. The resulting compact and thick foam layer is able to better contain the flames in a certain area, and thus prevent further spread of the fire. In addition, the contact between the burning liquid and the surrounding air is effectively reduced and / or eliminated, which enables faster extinguishing of the flaming liquids.

Figure 3a shows a perspective view of an embodiment of an assembled fire extinguisher nozzle 1 according to the present invention, which nozzle 1 comprises three distinct and / or removable parts, namely a mixing chamber 2 , a ventilation chamber 3, and a foaming chamber 4. The nozzle 1 is particularly useful for extinguishing class A fires and should be understood as having an inlet a and an outlet b. Fig. 3b shows a perspective view of the same embodiment of the fire extinguisher nozzle 1 in a disassembled state. The mixing chamber 2, the ventilation chamber 3 and the foaming chamber 4 can be recognized here as three distinct entities. For ease of coupling and / or decoupling of said parts, external threads 12 are provided at the level of the inlet a of the mixing chamber 2, at the level of the outlet of the mixing chamber 2, and at the level of the outlet of the ventilation chamber 3. Compatible internal threads 11 are provided at the entry of the ventilation chamber 2 and at the entry of the foaming chamber 4. The relationship between the axial length and the diameter interior (L: d) of foaming chamber 4 is further unambiguously determined to be between 4: 5 and 9: 5. The ventilation chamber 3 has four air inlet holes 6, which allows contact between the ambient air and the fire extinguishing composition passing through the nozzle 1. The ventilation chamber 3 further comprises a mesh 7, which influences different foaming characteristics, such as discharge time, discharge rate, foam expansion, size of foam bubbles, angle of foam discharge, etc. By using the nozzle 1 described herein, the foaming characteristics of a fire extinguishing composition are changed so that the fire extinguishing composition can be optimally used to extinguish Class A fires. a fast and efficient way.

Figure 4a shows a perspective view of an embodiment of an assembled fire extinguisher nozzle 1 according to the present invention, which nozzle 1 comprises three distinct and / or removable parts, namely a mixing chamber 2 , a ventilation chamber 3, and a foaming chamber 4. The nozzle 1 is particularly useful for extinguishing class B fires and should be understood as having an inlet a and an outlet b. Fig. 4b shows a perspective view of the same embodiment of the fire extinguisher nozzle 1 in a disassembled state. The mixing chamber 2, the ventilation chamber 3 and the foaming chamber 4 can be recognized here as three distinct entities. For ease of coupling and / or decoupling of said parts, external threads 12 are provided at the level of the inlet a of the mixing chamber 2, at the level of the outlet of the mixing chamber 2, and at the level of the outlet of the ventilation chamber 3. Compatible internal threads 11 are provided at the entry of the ventilation chamber 2 and at the entry of the foaming chamber 4. The relationship between the axial length and the diameter interior (L: d) of foaming chamber 4 is further unambiguously determined to be between 6: 1 and 10: 5. The ventilation chamber 3 has four air inlet holes 6, which allows contact between the ambient air and the fire extinguishing composition passing through the nozzle 1. The ventilation chamber 3 further comprises a mesh 7, which affects different characteristics of foaming, such as discharge time, discharge rate, foam expansion, size of foam bubbles, angle of foam discharge, etc. By using the nozzle 1 described herein, the foaming characteristics of a fire extinguishing composition are changed so that the fire extinguishing composition can be optimally used to extinguish Class B fires of. a fast and efficient way.

Figure 5 shows a perspective view of one embodiment of a ventilation chamber 3 according to the present invention, comprising air inlet holes 6 and a mesh 7. For ease of coupling and / or decoupling of the ventilation chamber 3 from other parts of the nozzle, an external thread 12 is provided.

Figure 6 shows a perspective view of an embodiment of a ventilation chamber and a foaming chamber 4 according to the present invention, which ventilation 3 and foaming 4 chambers form a single indivisible body. Notwithstanding that the ventilation chamber 3 and the foaming chamber 4 are formed as a single indivisible body, the ratio between the axial length and the internal diameter (L: d) of the foaming chamber 4 is unambiguously determined to be between 4: 5 and 9: 5. Figure 6 further serves to illustrate the first hollow cylindrical body 5 of the ventilation chamber 3, which is provided on the inside with an internal thread 11, to ensure easy coupling and / or decoupling with a ventilation chamber. mixture, and includes four air inlet holes 6.

Figure 7 shows a perspective view and a cross-sectional entry view of one embodiment of a mixing chamber 2 according to the present invention.

The mixing chamber 2 includes two narrowed inlet holes 8, which improve the speed and turbulence of the liquid flow of a fire extinguishing composition before entering a ventilation chamber. The easy coupling of said mixing chamber 2 with an upstream extinguisher and a downstream ventilation chamber is made possible by the external threads 12.

The mixing chamber further includes an elongated outlet 9 which is configured such that it effectively guides a fire extinguishing composition within and / or at least midway through a chamber. ventilation to which it is coupled.

Figure 8 shows a sectional representation along an axial central axis of an embodiment of a ventilation chamber 3 according to the present invention. The ventilation chamber 3 includes air inlet holes 6 and is provided with a mesh 7 and an external thread 12, for easy coupling to a foaming chamber. The first hollow cylindrical body 5, in particular the inner cross section of the ventilation chamber 3, has a cross-sectional constriction 10, which is shaped as a venturi-type constriction. This induces a venturi effect inside the first hollow cylindrical body 5, thus sucking air through the air inlet holes 6 of the ventilation chamber 3.

List of numbered items: 1 fire extinguisher nozzle 2 mixing chamber 3 ventilation chamber 4 foaming chamber 5 first hollow cylindrical body 6 air inlet hole 7 mesh 8 narrow inlet hole 9 outlet hole elongated 10 cross-sectional narrowing 11 internal thread 12 external thread a inlet b outlet L axial length d inner diameter

Claims (15)

1. Fire extinguishing nozzle, the fire extinguishing nozzle (1) comprising a mixing chamber (2), a ventilation chamber (3) and a foaming chamber (4), in which - said ventilation chamber is coupled to said mixing chamber, and comprises a first hollow cylindrical body (5) comprising at least three air inlet holes (6), said air inlet holes are arranged on the circumference and are directed into the first hollow cylindrical body, - said foaming chamber comprises a second hollow cylindrical body having an axial length (L) and an internal diameter (d), which foaming chamber is coupled to said ventilation chamber, and - said ventilation chamber and / or said foam chamber comprise a mesh (7), in which said mesh is oriented in the radial plane of the inner cross section of the ventilation chamber and / or the foam chamber, characterized in that the ratio of the length axial and the internal diameter (L: d) of the foaming chamber is between 4: 5 and 9: 5 to extinguish class A fires, or between 6: 1 and 10: 1 to extinguish class B fires. 2. Fire extinguisher nozzle according to claim 1, characterized in that said ratio between the axial length and the internal diameter (L: d) of the foaming chamber (3) is between 4: 5 and 8: 5 to extinguish class A fires, or between 7: 1 and 9: 1 to extinguish class B fires. 3. Fire extinguishing nozzle according to claim 1 or 2, characterized in that said axial length (L) of the foaming chamber (3) is between 10.0 and 30.0 mm for the extinction of class A fires, or between 100.0 and 170.0 mm for extinguishing class B fires. 4. Fire extinguisher nozzle according to any one of the preceding claims 1 to 3, characterized in that said mesh (7) has a mesh opening of between 700 and 1200 µm, preferably between 800 and 1100 µm. 5. Fire extinguisher nozzle according to any one of the preceding claims 1 to 4, characterized in that the inner cross section of the ventilation chamber (3) has a cross-sectional narrowing (10). 6. A fire extinguisher nozzle according to claim 5, characterized in that said cross-sectional constriction (10) is in the form of a venturi-type constriction. 7. Fire extinguisher nozzle according to any one of the preceding claims 1 to 6, characterized in that the mixing chamber (2) has at least two narrow inlet holes (8). 8. Fire extinguisher nozzle according to any one of the preceding claims 1 to 7, characterized in that the mixing chamber (2) comprises an elongated outlet (9). 9. Fire extinguisher nozzle according to claim 8, characterized in that, said elongated outlet port (9) has the shape of a circular truncated cone. 10.Fire extinguishing nozzle according to any one of the preceding claims 1 to 9, characterized in that, said mixing chamber (2), said ventilation chamber (3) and said foaming chamber (4) are a single indivisible body. 11.Fire extinguishing nozzle according to any one of the preceding claims 1 to 10, characterized in that, said mixing chamber (2), said ventilation chamber (3) and said foaming chamber (4) comprise at least two distinct and / or removable parts of the nozzle, preferably three distinct and / or removable parts of the nozzle. 12. A fire extinguisher comprising a fire extinguisher composition, said fire extinguisher is provided with a nozzle, wherein said nozzle is a nozzle according to any one of claims 1 to 11. 13. A fire extinguisher according to claim 12, characterized in that said fire extinguishing composition is free of fluorine. 14. Use of the fire extinguisher nozzle according to any one of claims 1 to 11 or the fire extinguisher according to claim 12 or 13 for extinguishing class A or class B fires. 15.Use according to claim 14, characterized in that said fire extinguishing composition is free of fluorine.