EP3311886A1 - Muffled extinguishing nozzle assembly having a frequency selective noise dampening coating as well as suitable use - Google Patents

Abstract

It is a sound-damped extinguishing nozzle assembly (1) for a building-installed extinguishing system specified, which has at least one extinguishing nozzle (11) for the outflow of an extinguishing agent and a muffler (2) for the respective extinguishing nozzle. The respective extinguishing nozzle has at least one outflow opening (12) with a geometry that is at most 3 mm in at least one extent perpendicular to the propagation direction. The respective silencer has a frequency-selective silencing layer (22), which is arranged in such a way that an extinguishing agent jet emerging from the respective outflow opening strikes the silencing layer in the propagation direction (SA). The latter has a sound absorption coefficient (±) rising from a sound frequency (f) of 125 Hz and is preferably a melamine resin foam. Furthermore, the invention relates to a use of a frequency-selective Schalldämpfschicht for attachment to a quenching nozzle of a building-installed inert gas extinguishing system for reducing the noise level (L pk) during an erase operation.

Description

The invention relates to a sound-damped extinguishing nozzle arrangement for a building-installed extinguishing system with at least one extinguishing nozzle for the outflow of an extinguishing agent. The respective extinguishing nozzle has at least one outflow opening with a geometry that is at most 3 mm in at least one extent perpendicular to the propagation direction.

Gas extinguishing systems and extinguishing methods are known from the prior art in which an extinguishing agent is conducted from a pressure vessel via a container valve and line system to one or more extinguishing nozzles during the discharge. The (solely) extinguishing agent stored in the pressure vessel may e.g. an inert gas such as nitrogen, argon or carbon dioxide. Alternatively, the extinguishing agent may comprise an extinguishing liquid and a propellant gas. The extinguishing liquid in this case is a chemical extinguishing liquid. It is particularly based on halohydrocarbons (halons), e.g. on HFC-227 or HFC-23, or on fluorinated ketones, e.g. on FK-5-1-12 sold under the trade name Novec® 1230. The propellant gas is preferably an inert gas such as nitrogen or argon, or carbon dioxide.

Various embodiments are known in the field of extinguishing nozzles for building-installed extinguishing systems. Generally, pipes are placed at the exit point of the extinguishing system. Conveniently, building extinguishing systems are ceiling-mounted, and depending on the volume of space and space geometry several exit points are provided. The pipe ends are then completed with an extinguishing nozzle, which are usually made as Einschraubteile, so that the installation is simplified. A typical example of an extinguishing nozzle is about a cap nut as an end cap, are drilled in the holes that form the outlet openings for the extinguishing medium. All previous extinguishing nozzles had the problem that it comes in a deletion process to a large noise. Since a noise level of up to 140 dB can be achieved with different nozzles, this noise level is within a range that can damage the human ear. In addition, devices in a room to be deleted are also at risk. In particular, the high noise level poses a problem for the stability of, for example, the hard disks in computing or data service centers. It has been shown that hard disks work incorrectly even from a noise level of 120 dB, in some cases even as low as 90 dB. At a higher noise level, permanent damage or even destruction can occur.

To alleviate this problem, silencers, e.g. Sintered body, known, which are connected downstream of the extinguishing nozzles and are additionally flowed through. The flow through another component, however, greatly reduces the flow velocity, so that sufficient mixing of the room air with the quenching gas is no longer guaranteed.

From the international release WO 2012/136468 A2 The applicant is a device for outflow of an extinguishing medium with at least one outflow indicated. In this case, the outflow opening is characterized in that the extinguishing medium assumes such a flat beam shape that no flow vortices can form therein which would emit sound waves of a wavelength of the acoustic spectrum perceivable by the human ear. This is ensured by the geometry of the discharge opening. According to a local embodiment, the outflow opening is composed of a plurality of small juxtaposed openings such as boreholes. The openings are lined up in such a way that they essentially act like a through opening on an outflowing medium. This allows noise reduction to a maximum of 90 dB.

Here causes the line-shaped, a flat jet generating geometry of the outflow, that on the one hand, the entire acoustic sound power is significantly reduced due to the sound waves generated by the now significantly reduced flow vortexes and that, on the other hand, shifts the acoustic spectrum towards higher frequencies, ie to sound frequencies beyond 10 kHz.

In comparison to the quenching nozzles mentioned above, the spectral range of the sound waves generated in the audible acoustic range is shifted by about two to three orders of magnitude towards higher frequencies. At the same time, the entire noise level bandwidth is advantageously reduced by approximately 20 dB. This is independent of whether the flat jet is formed by a slot-shaped outflow opening or by the juxtaposed many small openings or boreholes, which are close to each other, and which immediately reunite into a common flat jet.

Even if by means of in the WO 2012/136468 A2 described sound-reduced extinguishing nozzles a significant noise reduction has been achieved, so there remains nevertheless a construction-related low noise reduction in the frequency range above 10 kHz. However, as it has been shown, these remaining high-frequency flooding noise still leads to interference and disruption of sensitive hard drives.

On this basis, it is an object of the present invention to provide an improved extinguishing nozzle arrangement.

The object of the invention is achieved with a sound-damped extinguishing nozzle arrangement which has a silencer for the respective extinguishing nozzle. The respective silencer comprises a frequency-selective silencing layer which is arranged such that an extinguishing agent jet emerging from the respective outflow opening impinges on the sound-damping layer in the propagation direction. The sound-absorbing layer has a sound absorption coefficient α that increases significantly (significantly) from a sound frequency of 125 Hz, in particular of 250 Hz. In particular, the Schalldämpfschicht a sound absorption coefficient α, which increases from a frequency value of 125 Hz or 250 Hz, starting from a sound absorption coefficient of 0.1 or a maximum of 0.1 (significant).

The basic idea of the invention lies in the advantageous combination of an already noise-reduced extinguishing nozzle according to the aforementioned WO 2012/136468 A2 and a frequency-selective silencing layer. In this case, by means of the noise-reduced extinguishing nozzle, the barely attenuatable low-frequency acoustic spectral components up to 125 Hz or 250 Hz shifted to higher-frequency spectral components beyond 10 kHz, at the same time the formation of low-frequency spectral components is effectively reduced. Especially on these remaining higher-frequency spectral components, the Schalldämpfschicht acts strongly attenuating, while this is not suitable to attenuate the otherwise hardly attenuated low-frequency spectral components.

As a result, the remaining higher-frequency spectral components can be advantageously effectively attenuated even with a thin sound-damping layer.

Another advantage is the low technical and design effort for the realization of a muffler. As a result, existing, noise-reduced extinguishing systems can be easily retrofitted with a silencer.

In contrast, a large-volume, labyrinthine and bulky Schalldämpfvorrichtung for effective soundproofing would be required for the aforementioned conventional extinguishing nozzle with comparatively large outflow. This sound damping device would also protrude disadvantageously far into the room and also provide the extinguishing agent only with delay.

The sound absorption coefficient α indicates how large the absorbed portion of the total incident sound is. Thus, at a sound absorption level of 1, the complete incidental Sound absorbed. In other words, then no reflection takes place. In contrast, no absorption occurs at a sound absorption level of 0. The entire incident sound is reflected. Depending on the sound damping system, the values for the sound absorption coefficient α are normally between 0.1 and 0.9 and depend on the surface material and the sound frequency.

According to one embodiment, the sound-absorbing layer has a sound absorption coefficient α, which increases from a frequency value of 125 Hz, in particular of 250 Hz, starting from a sound absorption degree value α of 0.1 or at most 0.1, and above a frequency value of 5000 Hz, in particular already a frequency value of 1000 Hz, a sound absorption degree value α of at least 0.9 is reached.

According to an advantageous embodiment, the respective extinguishing nozzle has at least one outflow opening with a geometry that is at most 1 mm, in particular at most 0.5 mm, in at least one extension perpendicular to the propagation direction. As a result, the acoustic spectral components are shifted particularly far beyond 10 kHz, in particular beyond 50 kHz. Such high sound frequencies can be effectively dampened with a particularly low noise reduction effort.

According to a preferred embodiment, the Schalldämpfschicht is an open-cell foam, in particular of a plastic. It is typically an open celled melamine resin foam. The sound-damping layer may alternatively be a mineral fiber layer. Silencer layers with continuous open pores are particularly suitable for converting the kinetic component of the sound energy by friction into heat energy and thus reducing the sound energy. Schalldämpfschichten of melamine resin foam have the further advantage that they also meet the high requirements for fire protection, ie are flame retardant.

According to a further embodiment, the sound-damping layer has a layer thickness in a range of 5 mm to 50 mm, in particular in a range of 10 mm to 30 mm.

According to another embodiment, the silencer is tuned with respect to its acoustic sound attenuation characteristics on the extinguishing nozzle with their respective outflow that a noise level during an erase operation does not exceed a maximum noise level of 85 dB, in particular of 80 dB. A maximum allowable noise level may be e.g. be adjusted by a suitable choice of the layer thickness and / or the average pore size of the Schalldämpfschicht.

According to one embodiment, the extinguishing agent provided for fire extinguishment is an inert gas, in particular nitrogen, argon or carbon dioxide. It may alternatively be a chemical extinguishing agent, such as e.g. Halon, HFC 227 or Novec 1230.

It is particularly advantageous if the respective outflow opening in the extinguishing nozzle is configured such that the outflowing extinguishing agent assumes a flat jet shape. As a result, the acoustic spectral components are shifted far beyond 10 kHz. In particular, the respective outflow opening has a slot-shaped or slot-shaped geometry.

According to one embodiment, the respective outflow opening extends along a straight line or along an arc, in particular a circular arc.

According to a particularly advantageous embodiment, the respective outflow opening has a multiplicity of openings or bores which, in particular, are strung together in such a way that they act on an outflowing extinguishing agent essentially like a through-opening. In other words, the respective outflow opening is composed of the multiplicity of openings and bores. Preferably, the Openings or holes on a maximum diameter of 1 mm, in particular 0.5 mm.

According to a particularly advantageous embodiment, the extinguishing nozzle is configured as a diffuser tube or as a cylindrical conical nozzle. The respective silencer is a silencer tube, on the inside of which the silencing layer is arranged. The silencer tube is dimensioned such that the silencing layer substantially completely surrounds the respective outflow opening of the extinguishing nozzle. The respective outflow opening has a minimum distance to the opposite Schalldämpfschicht in the range of 5 mm to 30 mm, in particular in the range of 10 mm to 20 mm.

By "completely surrounds" it is meant here that the tubular sound-damping layer surrounds and in particular encloses the respective outflow opening along the entire axial extent of the respective outflow opening. By "axial" directions are designated parallel to the axis of rotation of the muffler tube. Such a sound-damped extinguishing nozzle arrangement is particularly space-saving. By the spacing of the respective outflow opening to the opposite Schalldämpfschicht is enough space for the radial and then axial expansion of emerging from the respective discharge opening extinguishing agent available.

According to an advantageous embodiment, the silencer tube on an axially projecting piece of pipe, which, measured from an axially outer end of the respective outflow opening to the tube outlet opening, an acoustic absorber space with an axial protrusion length in the range of 5 cm to 50 cm, in particular in a range of 10 cm to 20 cm training. The "downstream" absorber space advantageously further reduces the noise level.

Corresponding to the sound-damped extinguishing nozzle arrangement according to the invention, the object of the present invention Furthermore achieved by a particularly advantageous use of a frequency-selective Schalldämpfstoffs for attachment to a quenching nozzle of a building-mounted inert gas extinguishing system for reducing the noise level during a deletion. The extinguishing nozzle has at least one outflow opening with a geometry that is at most 3 mm, in particular at most 0.5 mm, in at least one extension perpendicular to the propagation direction, so that the eddies occurring in an emerging extinguishing agent jet radiate essentially acoustic rotational frequencies in the higher frequency range from 125 Hz , The silencer is arranged such that an extinguishing agent jet emerging from the respective outflow opening strikes the silencing layer in the direction of propagation and at a minimum distance. The sound-absorbing layer has a sound absorption coefficient α that increases significantly (significantly) from a sound frequency of 125 Hz, in particular of 250 Hz.

FIG 1

eine Löschdüsenanordnung 1' nach dem Stand der Technik mit einer rohrförmigen Löschdüse 11 mit einer schlitzförmigen Ausströmöffnung 12.

FIG 2

einen Querschnitt durch die in FIG 1 gezeigte Löschdüse entlang der dortigen Schnittlinie II-II,

FIG 3

akustische Spektren einer herkömmlichen "lauten" Löschdüse, einer schallreduzierten Löschdüse gemäß der WO 2012/136468 A2 und einer schallgedämpften Löschdüsenanordnung gemäß der Erfindung sowie den frequenzabhängigen Verlauf des Schallabsorptionsgrads α eines bei der erfindungsgemäßen Löschdüsenanordnung verwendeten Schalldämpfstoffes,

FIG 4

eine erste Ausführungsform einer erfindungsgemäßen rohrförmigen, schallgedämpften Löschdüsenanordnung,

FIG 5

eine Ansicht auf eine Austrittsöffnung der in FIG 4 gezeigten schallgedämpften Löschdüsenanordnung entlang der dort eingetragenen Blickrichtung V,

FIG 6

eine zweite Ausführungsform einer erfindungsgemäßen rohrförmigen, schallgedämpften Löschdüsenanordnung mit mehreren schlitzförmigen Ausströmöffnungen,

FIG 7

eine dritte Ausführungsform einer erfindungsgemäßen rohrförmigen, schallgedämpften Löschdüsenanordnung mit einem linearen Diffusor aus einer Vielzahl hintereinander gereihter kleiner Bohrlöcher,

FIG 8

eine vierte Ausführungsform einer rohrförmigen, schallgedämpften Löschdüsenanordnung mit einem Umlenkelement zur Umlenkung des austretenden Löschmittels hin zur Decke gemäß der Erfindung,

FIG 9

eine fünfte Ausführungsform einer erfindungsgemäßen rohrförmigen, schallgedämpften Löschdüsenanordnung mit einem Trichter für die Löschmittelausleitung,

FIG 10

eine sechste Ausführungsform einer rohrförmigen, schallgedämpften Löschdüsenanordnung mit einem bauchförmigen Schalldämpfer gemäß der Erfindung,

FIG 11

einen Längsschnitt durch eine bekannte Konusdüse mit kreisbogenförmiger Ausströmöffnung,

FIG 12

eine Draufsicht auf die Ausströmöffnung gemäß der in FIG 11 eingetragenen Blickrichtung XII,

FIG 13

eine Draufsicht auf eine Konusdüse mit einer Vielzahl kleiner Bohrlöcher entlang eines Kreisbogens,

FIG 14

eine erste Ausführungsform einer erfindungsgemäßen schallgedämpften Löschdüsenanordnung mit einer derartigen Konusdüse,

FIG 15

eine zweite Ausführungsform einer schallgedämpften Konusdüse mit einem T-förmigen Schalldämpfer und

FIG 16

eine dritte Ausführungsform mit einem kugelförmigen Schalldämpfer gemäß der Erfindung.

The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments, which will be described in more detail in conjunction with the drawings. Here are shown in a schematic representation:

FIG. 1

an extinguishing nozzle assembly 1 'according to the prior art with a tubular extinguishing nozzle 11 with a slot-shaped outflow opening 12th

FIG. 2

a cross section through the in FIG. 1 shown extinguishing nozzle along the section line II-II,

FIG. 3

acoustic spectra of a conventional "loud" extinguishing nozzle, a sound-reduced extinguishing nozzle according to the WO 2012/136468 A2 and a sound-damped extinguishing nozzle assembly according to the invention and the frequency-dependent course of the sound absorption coefficient α a Schalldämpfstoffes used in the extinguishing nozzle assembly according to the invention,

FIG. 4

A first embodiment of a tubular, sound-damped extinguishing nozzle arrangement according to the invention,

FIG. 5

a view of an outlet opening in FIG. 4 shown sound-damped extinguishing nozzle assembly along the registered there viewing direction V,

FIG. 6

A second embodiment of a tubular, sound-damped extinguishing nozzle arrangement according to the invention with a plurality of slit-shaped outflow openings,

FIG. 7

a third embodiment of a tubular, sound-deadened extinguishing nozzle assembly according to the invention with a linear diffuser of a plurality of consecutively arranged small boreholes,

FIG. 8

A fourth embodiment of a tubular, sound-damped extinguishing nozzle arrangement with a deflecting element for deflecting the escaping extinguishing agent towards the ceiling according to the invention,

FIG. 9

A fifth embodiment of a tubular, sound-damped extinguishing nozzle arrangement according to the invention with a funnel for the extinguishing agent discharge,

FIG. 10

A sixth embodiment of a tubular, sound-damped extinguishing nozzle arrangement with a bulbous silencer according to the invention,

FIG. 11

a longitudinal section through a known cone nozzle with a circular arc outflow,

FIG. 12

a plan view of the outflow opening according to the in FIG. 11 registered line of vision XII,

FIG. 13

a top view of a cone nozzle with a plurality of small holes along a circular arc,

FIG. 14

A first embodiment of a sound-damped extinguishing nozzle arrangement according to the invention with such a cone nozzle,

FIG. 15

a second embodiment of a sound-damped conical nozzle with a T-shaped muffler and

FIG. 16

a third embodiment with a spherical silencer according to the invention.

FIG. 1 shows a erase nozzle assembly 1 'according to the prior art with a tubular extinguishing nozzle 11 with a slot-shaped outflow opening 12 extending therealong.

The extinguishing nozzle arrangement 1 'shown has, for example, two such extinguishing nozzles 11, of which only one is shown in detail. Both extinguishing nozzles 11 are connected to a common terminal block 10 in the form of a T-piece by means of a cap nut 14. The terminal block 10 itself is screwed onto a pipe end 3, which protrudes from the ceiling D of a space to be deleted. A pipe connected to the pipe end 3 is the supply line for an extinguishing agent, which is fed in the event of an extinguishing agent from an extinguishing agent container. B is the aperture diameter.

The operating principle of this known sound-reduced extinguishing nozzle 11 is based on a two-stage expansion of the extinguishing gas flow or extinguishing agent flow. The orifice at the inlet of the connection block 10 determines the hydraulic resistance and thus the flow capacity of the two extinguishing nozzles 11. The pipe pressure is thereby significantly reduced and reduced to the nozzle-internal pressure. In this first expansion, a substantial proportion of the sound energy is already released, with the associated expansion noise remaining within the extinguishing nozzle 11. The second expansion with the reduction of the internal nozzle pressure to the ambient pressure corresponds to a much lower pressure drop.

The known tubular extinguishing nozzle 11 has a narrow slot along the tube axis as a discharge opening 12. In the example of the present figure, the extinguishing agent would emerge from the leaf level of the figure. The extinguishing nozzle 11 is in particular designed so that the cross section of the extinguishing agent jet SA (see FIG. 2 ) is very narrow at least in one direction, that is, that a very shallow jet of extinguishing agent is emitted. As a result, no appreciable flow vortices can form in the free jet, which could emit sound waves at acoustic frequencies. In particular, the cross section of the extinguishing agent jet is very narrow in one direction, but very elongated in another direction. Such a flat beam shape can be generated particularly well by the described gap-shaped or slot-shaped geometry of the outflow opening 12. In contrast to previous "noisy" nozzle shapes that omit approximately rotationally symmetrical gas flows through comparatively large bores with a diameter of 5 to 10 mm, the flat gas or liquid jet has the advantage that no flow vortices occur therein, the acoustic frequencies detectable by human hearing in the frequency range beyond 10 kHz radiate.

With IN also the pipe interior is called, which is flooded in the case of deletion with the extinguishing agent. The outer diameter is denoted by AR and DL is the axial total length of the extinguishing nozzle 11 or of the extinguishing tube shown. Typical values for the outer diameter AR are, for example, 25 mm, 30 mm or 35 mm. The typical values for the total axial length DL are 25 cm, 30 cm or 35 cm. The tubular extinguishing nozzle 11 is further sealed at the axial end with a pipe end 13 in the form of a cap.

FIG. 2 shows a cross section through the in FIG. 1 shown extinguishing nozzle 11 along the section line II-II. In this illustration, on the one hand, the tube longitudinal axis A and the beam propagation direction SA of the radially exiting through the discharge opening 12 extinguishing agent entered.

FIG. 3 shows acoustic spectra S1-S3 a conventional "loud" extinguishing nozzle, a sound-reduced extinguishing nozzle according to the WO 2012/136468 A2 and a sound-damped extinguishing nozzle arrangement according to the invention as well as the frequency-dependent profile ASP of the sound absorption coefficient α of a sound damping layer used in the extinguishing nozzle arrangement according to the invention.

L _{pk denotes} a third octave noise level with the unit dB for decibels. The acoustic spectra S1-S3 are logarithmically plotted against the sound frequency f. M1-M3 denotes the respective maximum of the spectra S1-S3. In the diagram shown, the curve ASP of the sound absorption coefficient α of an exemplary sound-damping layer made of melamine resin foam is also entered.

The first metrologically acquired acoustic spectrum S1 comes from a "loud" extinguishing nozzle, as used in the FIG. 1 the initially described WO 2012/136468 A2 is shown. It can be seen that maximum sound levels up to 110 dB are achieved. Such high levels are painful to human hearing. In addition, it has been shown that hard drives are already working incorrectly with these values.

The second acoustic spectrum S2 originates from a sound-reduced extinguishing nozzle according to an embodiment in FIG WO 2012/136468 A2 with a plurality of holes with a diameter of 0.5 mm, the holes being arranged along a straight line at a distance of 5 mm behind one another. In comparison to the previous spectrum S1, the generally lower noise level is shown with a maximum M2 reduced by 20 dB. At the same time it can be seen that the first Spectrum S1 is now shifted to high frequencies beyond the 10 kHz. However, the noise level values in the spectrum S2 at 20 kHz and more are significantly higher than in the spectrum S1.

The third acoustic spectrum S3 comes from a sound-damped extinguishing nozzle according to the invention. The same extinguishing nozzle was used as in the previous case. However, according to the invention, a tubular silencer with a melamine resin foam was additionally slipped onto this extinguishing nozzle at a radial distance of approximately 10 mm (see the following FIG. 4 ). The shaded area drawn between the two spectra S2 and S3 shows the high sound-damping effect of the frequency-selective sound-damping layer made of melamine resin foam especially in the higher-frequency range and significantly increasing from about 250 Hz. Depending on the thickness of the melamine resin foam used from about 2500 Hz to 4000 Hz absorbs more than 95 percent of the acoustic energy impinging on the silencing layer from the extinguishing agent. The inventive combination of a sound-reduced extinguishing nozzle with a very narrow geometry of the outflow and a spectrally matched muffler with an open-pore Schalldämpfschicht result advantageously unmatched low noise level of 80 dB at a largely uniform, spectrally distributed emission.

FIG. 4 shows a first embodiment of a tubular, sound-damped extinguishing nozzle assembly 1 according to the invention.

In comparison to FIG. 1 is the extinguishing nozzle 11 now shown in dashed lines surrounded by a cylindrical tubular muffler 2 while maintaining a minimum radial distance RA in an exemplary range of 5 to 10 mm. Through the intermediate layer ZS remaining in this way, the extinguishing agent emerging radially from the outflow opening 12 can then escape through the intermediate layer ZS and further in the axial direction to the outlet opening at the axial end of the extinguishing nozzle 11 with a low flow resistance. Preferably For example, the ratio of the silencer inner cross section Q2 to the extinguishing tube cross section Q1 is in the range from 2 to 10, so that a sufficiently large intermediate layer ZS remains for a low-resistance extinguishing agent passage to the outside. The reference symbol IS here denotes the inner diameter of the sound-damping layer 22. The other axial end of the muffler 2 resting against the connection block 10 is bounded by a perforated disk 23 by way of example. It is used to attach the entire muffler 2 on the terminal block 10th

The muffler 2 shown is surrounded by a hard plastic shell 21 for mechanical protection of the radially inner Schalldämpfschicht 22. The jacket thickness M is in a range of 1 to 2 mm and the radial thickness RD of the Schalldämpfschicht 22 is about 10 to 15 mm. AS is the outer diameter and SL denotes the axial length of the entire muffler 2.

Next according to the invention, the muffler 2 with a protrusion length UB in the range of 10 to 20 cm - measured from the axial end of the discharge opening 12 and the axial impact position of the extinguishing agent jet on the radial inner side of the Schalldämpfschicht 22 to the axial end of the muffler 2 - on the Extinguishing pipe end and thus forms an acoustic absorber space AB for advantageously further noise reduction.

FIG. 5 shows a view of an exit opening OF of in FIG. 4 shown sound-attenuated extinguishing nozzle assembly 1 along the registered therein viewing direction V. In this figure, the structure of the tubular muffler 2 and the ratio of the two cross sections Q1, Q2 is particularly well to see. In the present example, the ratio of Q2 to Q1 is about 3.3 and is thus sufficient for a low-flow resistance exit of the extinguishing agent through the so dimensioned radial intermediate layer ZS.

FIG. 6 shows a second embodiment of a tubular, sound-damped extinguishing nozzle assembly 1 according to the invention with a plurality of slit-shaped outflow openings 12. This can be arranged in the circumferential direction to the extinguishing tube 11 such that, for example, two extinguishing agent jets laterally and away from each other, and a third extinguishing agent jet down from the respective outflow opening 12 exits. In addition, an inlet opening of the extinguishing pipe 11 is designated by A and by 15 a flange or pipe collar, by way of which the extinguishing pipe 11 can be fastened to the connection block 10 by means of a cap nut 14.

FIG. 7 shows a third embodiment of a tubular, sound-deadened extinguishing nozzle assembly 1 according to the invention with a linear diffuser of a plurality of successively lined-up small holes 16. The holes preferably have a diameter of 0.5 mm. They are furthermore preferably arranged at a distance of 5 mm behind one another in a straight line. They are aligned according to the invention in such a way that they act essentially as a through opening 12 on an outflowing extinguishing agent.

The plurality of small openings 16 has the advantage of the mechanical stability of the extinguishing tube 11 and a simple manufacturing variant in which the openings 16 can be realized as boreholes.

FIG. 8 shows a fourth embodiment of a tubular, sound-damped extinguishing nozzle assembly 1 with a deflecting element UM for deflecting the escaping extinguishing agent towards the ceiling D according to the invention. The escaping extinguishing agent can then be deflected, for example against a mounted on the ceiling D further Schalldämpfschicht for further noise reduction.

FIG. 9 shows a fifth embodiment of a tubular, sound-deadened extinguishing nozzle assembly 1 according to the invention with a funnel TR for the extinguishing agent discharge.

FIG. 10 shows a sixth embodiment of a tubular, sound-damped extinguishing nozzle assembly 1 with a bulbous muffler 2 according to the invention.

FIG. 11 shows a longitudinal section through a known cone nozzle 11 with arcuate outflow opening 12 as an alternative embodiment of a tubular extinguishing nozzle 11. The conical nozzle 11 shown initially consists of a pipe section 17 which extends in particular cylindrical. This is followed by the conical end 18 of the cone nozzle 11 with the extinguishing nozzle device. The circular arc-shaped outflow opening 12 is located in this end cone 18. The arrows to the reference symbol SA again show the beam propagation direction of the extinguishing agent emerging from the slit-shaped outflow opening 12 describing a complete circular arc. Axially opposite in the conical nozzle 11 a not further designated internal thread is formed, so that the cone nozzle 11 can be screwed on this internal thread to a corresponding external thread of a protruding from the ceiling D pipe end 3. About the pipe end 3 takes place in the case of cancellation, the feed of the extinguishing agent in the conical nozzle eleventh

In the following FIG. 12 In detail, the spread of the escaping extinguishing agent is more apparent. The FIG. 12 shows a plan view of the outflow opening 12 according to the in FIG. 11 registered line of vision XII.

Also in this case, the outflow opening 12 has a geometry that is at most 3 mm in at least one extension perpendicular to the propagation direction. In the present example, the gap width of the outflow opening 12 is in the range of 0.5 mm to 1 mm. By means of such a shaped outflow opening 12, the extinguishing agent will emerge from the nozzle in the form of a conical jet. However, the cone jet is not fully filled as in a hole, but the extinguishing agent radiates only as a shallow cone coat. This ensures the noise level reduction.

FIG. 13 shows a plan view of a cone nozzle 11 with a plurality of small holes 16 along a circular arc.

The FIG. 13 shows an alternative embodiment of the outflow opening 12 for a conical nozzle 11. In this case, the outflow opening 12 is again not configured consistently, but has a plurality of small openings 16 and boreholes, which together result in an outflow 12. This outflow opening 12 is again arranged on a circular arc at the conical end 18 of the cone nozzle 11.

FIG. 14 shows the first embodiment of a sound-damped extinguishing nozzle arrangement 1 according to the invention with such a cone nozzle 11.

In comparison to FIG. 11 the conical nozzle 11 now shown by dashed lines is surrounded by a cylindrical, tubular muffler 2 while maintaining a minimum distance MA in an exemplary range of 10 to 20 mm. It is essential that the muffler 2 has an axial minimum length and is arranged axially such that the escaping extinguishing agent in the beam propagation direction SA completely and at the minimum distance MA impinges on the inside of the Schalldämpfschicht 22. The reference symbol IS denotes the inner diameter of the sound-damping layer 22. It is dimensioned such that the muffler 2 can be inserted over the cylindrical tube section 17 of the cone nozzle 11. In this case, the radial inner side of the sound-damping layer 22 does not necessarily rest flush against the radial outer side of the cylindrical tube section 17. The radial inside may also be spaced apart, such as up to a radial distance of 20 mm. Since the main source of noise originates from the escaping extinguishing agent, in the axial region in which the Schalldämpfschicht 22 abuts the cylindrical pipe section 17, this Schalldämpfschicht 22 may be replaced by another material, such as by an elastic layer 22 'of silicone, rubber or rubber in the sense of Sleeve. At the exit opening OF axially opposite end of the muffler 2, the muffler 2 is again limited by a perforated disc 23. It may be provided for attachment of the entire muffler 2 at the pipe end 3 or on the ceiling 4.

The muffler 2 shown is in turn surrounded by a hard plastic shell 21 for mechanical protection of the radially inner Schalldämpfschicht 22. The jacket thickness M is in a range of 1 to 2 mm and the radial thickness RD of the Schalldämpfschicht 22 is about 10 to 15 mm. AS is the outer diameter and SL denotes the axial length of the entire muffler 2.

In the present example, the silencer 2 is an axial projection length UB, measured from the axial impact position of the extinguishing agent jet on the radially inner side of the Schalldämpfschicht 22 to the axial end of the muffler 2 in the region of the outlet opening OF. The acoustic absorber space AB formed from this axial position serves for further noise reduction according to the invention. The extinguishing agent emerging at the exit opening OF in the direction of the arrow indicated there exits there with a drastically reduced noise level.

FIG. 15 shows a second embodiment of a sound-damped conical nozzle 11 with a T-shaped muffler 2. In this case, the extinguishing agent passes through two outlet openings OF to the outside. Of course, further outlet openings OF may be provided, such as in a cross-shaped silencer 2 with two additional outlet openings OF in the leaf level of FIG. 15 (not shown).

FIG. 16 finally shows a third embodiment with a spherical muffler 2 according to the invention. In this case, the conical nozzle 11 is completely enclosed except for the radially inclined in the direction of the ceiling D facing and recessed in the muffler 2 outlet openings OF. The There escaping extinguishing agent can for example impinge against a mounted on the ceiling D further Schalldämpfschicht for further noise reduction.

LIST OF REFERENCE NUMBERS

1, 1 '

Extinguishing system, gas extinguishing system

2

Silencer, frequency-selective silencer

3

pipe end

10

Terminal block, T-piece

11

extinguishing nozzle

12

outflow

13

End caps

14

Mother, hat mother

15

Pipe collar, flange

16

diffuser holes

17

pipe section

18

cone final

21

Outer jacket, pipe jacket

22

Silencer, melamine resin foam, foam

22 '

Fixing element, elastic layer, sleeve

23

perforated disc

A

Diffuser axis, extinguishing tube axis

FROM

anechoic chamber

AR

Outer diameter, diffuser outer diameter

AS

Outer diameter of the muffler

ASP

absorption spectrum

B

Aperture diameter

D

blanket

dB

decibel

DL

diffuser length

ONE

Feeder, inlet

f

Frequency, acoustic frequency

Hz

hertz

IN

Pipe interior, pipe interior

IR

Inner diameter, diffuser inner diameter

IS

Inner diameter of the muffler

L

Length of the discharge opening

Lp _k

Noise level, noise level

M

Jacket thickness, tubular jacket thickness

MA

minimum distance

M1-M3

maximum

OF

Pipe outlet opening, outlet opening

Q1

Diffuser pipe cross-sectional area

Q2

Gap cross-sectional area

RA

radial distance

RD

radial diameter

SA

Beam propagation direction, propagation direction

SL

silencer length

S1-S3

frequency spectrum

TR

funnel

AROUND

deflecting

UB

Projection length

ZS

gap

α

Sound absorption coefficient

Claims (15)

Sound-damped extinguishing nozzle arrangement for a building-installed extinguishing system, which has at least one extinguishing nozzle (11) for emptying an extinguishing agent and a silencer (2) for the respective extinguishing nozzle (11), wherein the respective extinguishing nozzle (11) has at least one outflow opening (12) with a geometry which is a maximum of 3 mm in at least one extent perpendicular to the propagation direction, wherein the respective muffler (2) has a frequency-selective muffling layer (22) which is arranged such that an extinguishing agent jet emerging from the respective outflow opening (12) in the propagation direction (SA) on the Schalldämpfschicht (22), and wherein the Schalldämpfschicht (22) has a starting from a sound frequency (f) of 125 Hz increasing sound absorption coefficient (α). A sound-damped extinguishing nozzle arrangement according to claim 1, wherein the sound-damping layer (22) has a sound absorption coefficient (α) which increases starting from a frequency value of 125 Hz from a sound absorption coefficient of maximum 0.1 and from a frequency value of 5000 Hz, in particular from a frequency value of 1000 Hz, a sound absorption coefficient of at least 0.9 is reached. Sound-dampened extinguishing nozzle arrangement according to claim 1 or 2, wherein the respective extinguishing nozzle (11) has at least one outflow opening (12) with a geometry which is at least one extension perpendicular to the propagation direction at most 1 mm, in particular at most 0.5 mm. A sound-damped extinguishing nozzle arrangement according to one of the preceding claims, wherein the sound-damping layer (22) is an open-pored foam, in particular a melamine resin foam, or a mineral fiber layer. Sound-damped extinguishing nozzle arrangement according to one of the preceding claims, wherein the sound-damping layer (22) has a layer thickness in a range of 5 mm to 50 mm, in particular in a range of 10 mm to 30 mm. Sound-damped extinguishing nozzle arrangement according to one of the preceding claims, wherein the silencer (2) with respect to its acoustic sound attenuation characteristics on the extinguishing nozzle (11) with their respective outflow opening (12) is tuned such that a noise level (L _pk ) during a deletion a maximum noise level _value (M3 ) of 85 dB, especially 80 dB. A sound-damped extinguishing nozzle assembly according to any one of the preceding claims, wherein the fire extinguishing extinguishing agent is an inert gas, in particular nitrogen, argon or carbon dioxide, or a chemical extinguishing agent such as Halon, HFC 227 or Novec 1230. Sound-damped extinguishing nozzle arrangement according to one of the preceding claims, wherein the respective outflow opening (12) in the extinguishing nozzle (11) is designed such that the outflowing extinguishing agent assumes a flat beam shape. Sound-damped extinguishing nozzle arrangement according to one of the preceding claims, wherein the respective outflow opening (12) has a slit or slot-shaped geometry. Sound-damped extinguishing nozzle arrangement according to one of the preceding claims, wherein the respective outflow opening (12) runs along a straight line or along an arc, in particular a circular arc. A sound-damped extinguishing nozzle arrangement according to one of the preceding claims, wherein the respective outflow opening (12) has a multiplicity of openings or bores (20), which are lined up in such a way that they essentially as a through opening (12) act on an escaping extinguishing agent. Sound-damped extinguishing nozzle arrangement according to claim 11, wherein the openings or bores (20) have a maximum diameter of 0.5 mm. Sound-damped extinguishing nozzle arrangement according to one of the preceding claims, wherein the extinguishing nozzle (11) is designed as a diffuser tube or as a cylindrical cone nozzle, wherein the respective silencer (2) is a silencer tube, on the inside of the Schalldämpfschicht (22) is arranged, wherein the silencer tube (2 ) such that the sound-damping layer (22) completely surrounds the respective outflow opening (12) of the extinguishing nozzle (11) and wherein the respective outflow opening (12) has a minimum distance (MA) to the opposite sound-damping layer (22) in the range from 5 mm to 30 mm, in particular in the range of 10 mm to 20 mm. Sound-damped extinguishing nozzle arrangement according to claim 13, wherein the silencer tube (2) has an axially projecting pipe section, which, measured from an axially outer end of the respective outflow opening (12) to the pipe outlet opening (OF), an acoustic absorber space (AB) with an axial protrusion length (UB) in the range of 5 cm to 50 cm, in particular in a range of 10 cm to 20 cm forms. Use of a frequency-selective Schalldämpfstoffs (22) for attachment to an extinguishing nozzle (11) of a building-installed inert gas extinguishing system for reducing the sound level (L _pk ) during an erasing operation, wherein the extinguishing nozzle (11) has at least one outflow opening (12) having a geometry which in at least one extent perpendicular to the propagation direction is a maximum of 3 mm, in particular a maximum of 0.5 mm, so that the flow vortex occurring in an emerging extinguishing agent jet substantially acoustic rotational frequencies in the higher frequency range radiate from 125 Hz, wherein the muffler (2) is arranged such that from the respective outflow opening (12) emerging extinguishing agent jet in the propagation direction (SA) and at a minimum distance (MA) impinges on the Schalldämpfschicht (22), and wherein the Schalldämpfschicht (22) has a starting from a sound frequency (f) of 125 Hz increasing sound absorption coefficient (α).

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