EP1928558B1 - Jet pipe unit and method for producing an extinguishing agent mist - Google Patents

Abstract

A jet pipe unit for delivering extinguishing agent comprises at least one jet pipe (2) which is supplied with a pressurised extinguishing agent and provided with a tubular body (3) comprising an extinguishing agent input orifice and extinguishing agent output orifice formed by at least one nozzle (4), which, according to said invention, is rotatably movable around the longitudinal axis (5) thereof and/or a circular path which surrounds the axis of rotation in a concentric manner. Said invention also relates to a method for producing the extinguishing agent mist consisting in compressing a extinguishing agent, for example water, in supplying said extinguishing agent to a jet pipe unit (1) comprising at least one jet pipe (2) which is provided with one or several nozzles (4) in the form of the extinguishing agent output orifice, in forming the extinguishing agent jet (41) with the aid of a first jet unit section (42) embodied in the form of a beam substantially defining the jet width and a subsequent section in a jet through direction, wherein the jet, when the speed is rapidly reduced at a short distance, multiplies the cross-section surface in such a way that the extinguishing agent mist (43) is formed. The extinguishing agent jet rotatable about the longitudinal axis thereof is formed by rotationally displacing the jet pipe unit nozzle and/or the jet pipe unit at a value of an axis of rotation corresponding to the extension of the extinguishing agent jet longitudinal axis.

Description

The invention relates to an extinguishing agent dispensing jet tube unit, comprising at least one spray tube which can be acted upon with extinguishant under pressure and having a tube body having an extinguishing agent inlet opening and an extinguishing agent outlet formed from at least one nozzle of the extinguishing agent outlet.

For firefighting, water is used as extinguishing agent in many cases. This is sometimes provided with an extinguishing agent additive. When fighting fires, it is necessary to use the extinguishing agent to cool the fire and smother the fire. Available to a Feuerwehnnann are different jet pipes or jet pipe units that produce a different extinguishing agent jet depending on their training. For example, full jet or hollow jet pipes are known. It is also known that fire fighting using a liquid extinguishing agent, for example water with small extinguishing droplets in the form of a fire extinguishing agent, is more effective than fire fighting with an extinguishing agent full or hollow jet. To produce such an extinguishing agent mist is - as in DE 295 22 033 U1 described - next to the extinguishing agent requires a gaseous propellant. The propellant is used to atomize the aqueous extinguishing agent, for example, the water at the exit from the jet pipe. In addition, this previously known jet pipe unit has a fast-reacting closing element for chopping the extinguishing agent jet emerging from the jet pipe. From this previously known beam tube unit thus emerge from the jet pipe to a beam bundled water droplets. Already after a throw of only a few meters, the Löstreitteinebel spreads. Therefore, these jet pipe units are only suitable for fighting firefighting, if you can get close enough to the fire with the jet pipe unit. Such radiant tube units and the corresponding prior art method are thus unsuitable for forming a fire extinguishing agent for firefighting fire sources in the immediate vicinity you can not get, as this is the case for example in a forest fire. The application of radiant tubes for fire fighting To produce an aqueous extinguishing agent mist, therefore, are conventionally used mostly only in hand-held fire extinguishers.

The formation of extinguishing mists is also known from permanently installed, so-called sprinkler from buildings, ships or the like. In such sprinkler systems, an atomization of the extinguishing water by the extinguishing agent conductive internals in the outlet nozzles, so that the exiting extinguishing agent jet is formed from individual droplets and the extinguishing agent jet is formed with the largest possible opening angle cone-shaped. Finally, you want to be able to moisten the largest possible area with the escaping extinguishing agent.

It has become known for firefighting in wildfires also the use of jet engines as turbines to blow extinguishing agent as extinguishing agent mist to the point of fire. The turbine is used to generate the extinguishing agent mist from the aqueous extinguishing agent, such as water, as well as for transporting the extinguishing agent to the fire. In this fire extinguishing device, the goal is pursued, with the energy of a strong air flow, the generated extinguishing agent mist - the individual droplets - to transport as far as possible. Even if the extinguishing agent droplets produced can sometimes be shot up to 80 m with such a fire-extinguishing device and the jet pipe unit designed as a turbine, the extinguishing agent mist itself forms after a few meters, with the result that only a small proportion of the extinguishing agent droplets actually produced the aforementioned throwing distance are transported. Therefore, this fire-fighting equipment is suitable despite high energy use only for fighting fire sources at a distance of about 50 m. Moreover, targeted fire fighting is hardly possible with such a device.

A disadvantage of these prior art extinguishing equipment is also the consumption of extinguishing agent, which is problematic in a fire fighting, in which no continuous fire water supply (hydrant, fire water pond) can be built, as typically forest fires.

In WO 94/06517 A a method and apparatus for firefighting is described. The method described in this document alternately generates a liquid mist and a jet of liquid for firefighting. The alternate formation of the extinguishing agent jet serves the purpose that in a first step, a fire fighting from a greater distance to the fire with a conventional high-pressure extinguishing agent jet is combated. If the fire to be combated has cooled down far enough, you can approach the fire and then fire at close range with an extinguishing agent. To generate the extinguishing agent mist, the nozzle head of the device described in this document has a plurality of outlets, each with a swirling element. This swirling element is set in motion by the pending extinguishing medium pressure and serves the purpose of forming the desired liquid mist. Therefore, the generated liquid mist exits directly on the nozzle head. Effective firefighting by extinguishing agent sufficiently distant from the source of the fire can not be achieved even with the method described in this document or with the device described in this document.

In US 3,931,930 An extinguishing agent dispensing jet tube unit is described, in which the jet tube unit has a jet tube rotating about its longitudinal axis or the jet tube unit having a plurality of jet tubes spaced apart from the axis of rotation and expediently at the same angular distance from one another, the rotation being produced by the water pressure without drive unit.

Based on this discussed prior art, the invention is therefore based on the object to propose a Loschmittelabgabe-ray tube unit and a method for forming a extinguishing agent mist, with which device or by which method a targeted effective fire fighting with relatively low extinguishing agent consumption and especially with a greater distance to the source of fire can take place.

The object relating to the extinguishing agent dispensing jet tube unit is achieved according to the invention by an extinguishing agent dispensing jet tube unit having the features of claim 1.

• Bereitstellen eines unter Hochdruck anstehenden flüssigen Löschmittels, beispielsweise Wasser,
• Zuführen des Löschmittels an eine Strahlrohreinheit, umfassend zumindest ein Strahlrohr mit einer oder mehreren Düsen als Löschmittelaustrittsöffnung,
• Erzeugen eines Löschmittelstrahls mit einem ersten, im wesentlichen die Wurfweite definierenden Strahlabschnitt in Form eines gebündelten Strahls und mit einem sich in Wurfrichtung anschließenden Abschnitt, in dem der Strahl bei rascher Geschwindigkeitsabnahme auf kurzer Strecke seine Querschnittsfläche zur Ausbildung des Löschnebels um ein Vielfaches vergrößert, indem ein um seine Längsachse rotierender Löschmittelstrahl durch In-Rotation-Versetzen der zumindest einen Düse der Strahlrohreinheit und/oder der Strahlrohreinheit um eine der Verlängerung der Längsachse des Löschmittelstrahls entsprechenden Rotationsachse erzeugt wird.

The method according to the invention for forming an extinguishing agent mist is characterized by:

• Providing a high-pressure liquid extinguishing agent, for example water,
• Supplying the extinguishing agent to a jet pipe unit, comprising at least one jet pipe with one or more nozzles as an extinguishing agent outlet opening,
• Generating an extinguishing agent jet with a first, substantially the throw defining beam portion in the form of a focused beam and with a subsequent casting in section, in which the beam with rapid decrease in velocity over a short distance its cross-sectional area for forming the Löschnebel increased many times by a is generated about its longitudinal axis rotating extinguishing agent jet by rotating the at least one nozzle of the jet pipe unit and / or the nozzle unit by a rotation axis corresponding to the extension of the longitudinal axis of the extinguishing agent jet.

Such a beam tube unit is designed to form a bundled extinguishing agent jet which rotates about its longitudinal axis for its bundling and for stabilizing its trajectory. The rotating extinguishing agent jet is expediently produced by the at least one nozzle of the jet tube or the jet tube unit and / or the at least one jet tube of the jet tube unit and / or the entire jet tube unit being set into a rotary rotational movement about its longitudinal axis. For rotationally driving the jet pipe or the jet pipe unit, a drive device, for example a hydraulic motor, can be used. In addition to the aforementioned drive, extinguishing means can also be used to generate the rotating extinguishing agent jet in the jet pipe. For guiding or directing the extinguishing agent within the jet pipe, for example, the webs projecting from the inner wall thereof or grooves introduced into the inner wall thereof can be used which are designed to be spiral-like following the longitudinal extent of the jet pipe.

The liquid extinguishing agent used to produce the extinguishing agent jet is supplied under pressure to the jet pipe. Typically, the pressure with which the extinguishing agent is supplied to the jet pipe, adjustable, so that the jet pipe according to the respective requirements applied to the under suitable pressure extinguishing agent is. The respective set pressure of the jet pipe supplied extinguishing agent determines the exit velocity of the extinguishing agent jet from the jet pipe or the jet pipe unit in the axial direction. Since the emerging extinguishing agent jet is rotating at the same time, the pressure of the vectoring component of the extinguishing agent jet velocity pointing in the longitudinal direction of the extinguishing agent jet is determined. With regard to its design, the extinguishing agent jet emerging from the jet pipe or the jet pipe unit can be set correspondingly to the respective requirements in the case of fire fighting with reference to the two parameters pressure and rotation. It is assumed that the effective throw of the extinguishing agent jet and the speed of rotation can be used to set the distance of the formation of the extinguishing agent mist desired for fire fighting from the jet pipe unit via the pressure of the extinguishing agent supplied to the jet pipe or the jet pipe unit. It is further assumed that the two aforementioned parameters are in a certain context. By varying the extinguishing agent jet pressure and / or the rotational speed of the jet pipe or of the jet pipe unit, the desired extinguishing agent jet can be readily adjusted by anyone according to the respective requirements.

The extinguishing agent jet generated by such a jet pipe unit is to be addressed as a bundled extinguishing agent jet over a first throwing distance. In its volumetric extent, the desired extinguishing agent mist then forms from the extinguishing agent jet at this first throwing distance over a short distance. Thus, in this jet pipe unit or when using the aforementioned method used for fire fighting extinguishing agent over the first lane and transported largely lossless to the place of fire fighting, with the Lömititteinebel itself only at the place of fire fighting by taking place over a short distance quasi explodes explosive volume enlargement of the extinguishing agent jet or propagates.

The tube unit is suitable for the aforementioned reason, especially for combating such fires that can not be controlled from close proximity. To the extinguishing agent beam sufficient To impart throw, the liquid extinguishing agent is typically introduced under high pressure in the jet pipe unit. The pressure actually set depends on the design of the jet tube unit and the desired extinguishing agent jet formation. Although the above-described extinguishant jet configuration can be realized at lower pressures, the jet tube unit will typically be pressurized to pressures of 200 bar, 500 bar, 1000 bar or more. With such, under high pressure extinguishing agent acted on jet tube unit can achieve high extinguishing jet throwing distances, which can be up to 100 m or even more, before the actual extinguishing agent spray spatially forms or propagates almost explosively over a short distance. By setting the rotational speed of the extinguishing agent jet, the extinguishing agent jet can be set up with regard to the design, for example the stability of its trajectory. Due to the rotation of the extinguishing agent beam undergoes stabilization as a result of the twist. By changing the rotational speed, it is possible with constant pressure, to determine the point in which after the first throw of the extinguishing agent beam as a focused beam, this unfolds to form the extinguishing agent fog.

The opening width of the at least one nozzle of a jet pipe of such a jet pipe unit is small in diameter and is typically less than 2 mm. A nozzle cross-section of about 1 mm is preferred and considered sufficient. However, other nozzle cross-sectional widths may be provided. The small diameter nozzles result in lower extinguishing agent consumption. Preferably, the at least one nozzle of the jet pipe unit is formed as an acceleration nozzle and has a first gradually tapered convergent section, which is followed by the smallest diameter of the nozzle. At this portion of the smallest opening width of the nozzle may be followed by a diameter-increasing section. The nozzles may be formed, for example, as Laval nozzles.

When using such nozzles, it is possible to produce an extinguishing agent jet emerging from the nozzle at supersonic speed. If such a high-speed extinguishing agent jet is generated, according to the current state of knowledge assumes that the transition between the laminar-flowing extinguishing agent jet to a turbulent flow supports the droplet formation and thus the formation of the extinguishing agent mist over a short distance.

The at least one nozzle of the jet pipe or of the jet pipe unit can have transverse bores via which additives which are supplied via a suitable rotary feedthrough or which are present at the nozzle can be added to the extinguishing agent. In the case of a jet pipe unit with a plurality of nozzles, it may be provided that only a few nozzles have such an inlet.

In the case of jet pipe units with a plurality of jet pipes, the majority of the jet pipes is typically arranged at a distance from the axis of rotation of the jet pipe unit. Since the extinguishing agent is typically supplied via a rotational feedthrough defining the axis of rotation, the extinguishing agent experiences an acceleration as a result of centrifugal force, so that in this way the extinguishing agent pressure prevailing at the outlet nozzle (s) can be increased. This is dependent on the rotational speed of the jet pipe unit.

In the previously described jet pipes, their tubular bodies and the nozzles forming the extinguishing agent outlet opening were implicitly arranged one behind the other in the axial direction. However, this is not mandatory. The nozzle upstream tube body may also extend at an angle to the longitudinal axis of the nozzle. Such a tubular body thus extends in the radial direction to the rotational movement of such a jet tube unit and typically connects the axially arranged rotary feedthrough with the nozzle arranged at a distance from the rotational axis.

The jet pipe units can be accommodated in an open, for example, drum-like housing in the throwing direction of the extinguishing agent jet in order to avoid a possible risk of injury to the rotating jet pipes.

The invention is based on embodiments below

Fig. 1:

eine schematisierte, zum Teil geschnittene Seitenansicht einer Strahlrohreinheit zur Löschmittelabgabe gemäß einem ersten Ausführungsbeispiel,

Fig. 2:

die Strahlrohreinheit der Figur 1 mit einer geänderten Düsen- ausgestaltung,

Fig. 3:

noch eine weitere Düsenausgestaltung für eine Strahlrohrein- heit,

Fig. 4:

eine schematisierte Seitenansicht einer Strahlrohreinheit zur Löschmittelabgabe gemäß einer weiteren Ausgestaltung,

Fig. 5:

eine Ansicht auf die Öffnungsseite der Strahlrohre der Strahl- rohreinheit der Figur 4,

Fig. 6:

eine Ansicht auf eine weitere Strahlrohreinheit entsprechend derjenigen zur Figur 4 gezeigten mit einer demgegenüber an- deren Strahlrohranordnung,

Fig. 7:

in einer schematisierten An- und Einsicht eine Strahlrohrein- heit zur Löschmittelabgabe gemäß noch einem weiteren Aus- führungsbeispiel,

Fig. 8:

eine Strahlroheinheit gemäß einem weiteren Ausführungsbei- spiel,

Fig. 9:

eine Strahlrohreinheit gemäß noch einem weiteren Ausfüh- rungsbeispiel und

Fig. 10:

eine schematisierte Darstellung des durch die Strahlrohrein- heit gemäß Figur 4 abgegebenen Löschmittelstrahls und dem sich daraus bildenden Löschmittelnebel.

With reference to the accompanying figures. Show it:

Fig. 1:

a schematic, partially sectioned side view of a jet pipe unit for extinguishing agent delivery according to a first embodiment,

Fig. 2:

the jet pipe unit of FIG. 1 with a modified nozzle design,

3:

Yet another nozzle design for a radiant tube unit,

4:

a schematic side view of a jet pipe unit for extinguishing agent delivery according to another embodiment,

Fig. 5:

a view of the opening side of the jet pipes of the blasting tube unit of FIG. 4 .

Fig. 6:

a view of a further jet pipe unit corresponding to that for FIG. 4 shown with a different jet pipe arrangement,

Fig. 7:

in a schematic view and insight, a radiant tube unit for extinguishing agent delivery according to yet another exemplary embodiment,

Fig. 8:

a jet roughness unit according to a further exemplary embodiment,

Fig. 9:

a jet pipe unit according to still another embodiment, and

Fig. 10:

a schematic representation of the through the Strahlrohrein- unit according to FIG. 4 discharged extinguishing agent jet and the resulting extinguishing agent mist.

A jet pipe unit 1 according to a first embodiment comprises a jet pipe 2, consisting in the illustrated embodiment of a cylindrical tube body 3 and an output side, torque-connected to the tubular body 3 connected nozzle 4. The tubular body 3 has an extinguishing agent inlet opening. Embodiments with a plurality of extinguishing agent inlet openings are possible. The jet pipe 2 is rotatably supported about its longitudinal axis 5 in a manner not shown. For rotationally driving the jet pipe unit 1, which in this embodiment consists solely of the jet pipe 2, a hydraulic motor 6 with a pulley 7 is used on its drive shaft. A belt 8 serves to transmit the rotational movement of the pulley 7 to the jet pipe 2, for which purpose a belt guide 9 is arranged in the rear region of the tubular body 3 of the jet pipe 2. In its rear region of the tubular body 3 is connected to a designated generally by the reference numeral 10 rotary feedthrough. The rotary feedthrough 10 is used for supplying a liquid extinguishing agent, typically water from the stator side into the interior 11 of the tubular body 3 rotatable about its longitudinal axis.

The nozzle 4 has a section 12, which gradually tapers in a convergent manner towards the nozzle exit, with a circular cross-sectional area, to which the section of the nozzle 4 adjoins, in which the latter has its smallest opening width. This section is identified by the reference numeral 13. At this section 13 is followed in the illustrated embodiment, a short-held, slightly widening section as a nozzle exit. Of course, at this point, nozzles with a different nozzle configuration, for example, be used with a longer Düsenausgangsstrecke.

The jet pipe unit 1 is connected to a non-illustrated high-pressure extinguishing agent supply 14, through which the extinguishing agent - water - with a pressure of more than 500 bar input side of the rotary feedthrough 10 is present. The extinguishant pressure is adjustable to the respective desired formation of the extinguishing agent jet. The extinguishing agent loaded jet pipe unit 1 is rotated for its operation to produce a rotating extinguishing agent jet. The formation of the rotating extinguishing agent jet is supported by the length of the tubular body 3, since due to the internal wall friction, the supplied extinguishing agent is already set in the cylindrical portion of the tubular body 3 in rotation. The rotational speed of the jet pipe 2 is dependent on the desired extinguishing jet configuration, for example its bundling, and may be about 2,000 revolutions per minute. Depending on the fire to be combated and in particular its distance from the jet pipe unit 1, this can also be driven with a lower or higher rotational speed.

The jet pipe unit 1 is typically hinged to a vehicle, with both the extinguishing jet direction and the extinguishing jet discharge angle being adjustable.

FIG. 2 shows in a further embodiment, a jet pipe unit 1 ', which is constructed as the to FIG. 1 described jet pipe unit 1, which differs from the jet pipe unit 1 in terms of their nozzle arrangement. In contrast to the nozzle 4, the nozzle 4 'of the jet tube unit 1' is arranged eccentrically to the longitudinal axis 5 'of the jet tube 2', so that the nozzle constriction 13 'describes a circular path movement as a result of rotation of the jet tube 2' about the longitudinal axis 5 '. The extinguishing jet emerging from the jet pipe unit 1 'is to be regarded as hollow-beam-like by its helical configuration.

FIG. 3 shows a further nozzle configuration 15 for a jet pipe unit, such as the jet pipe unit 1 or 1 'or for one of the jet pipe units described below. The nozzle configuration 15 is a double nozzle with two individual nozzles 16, 16 '. The nozzles 16, 16 'are basically designed like the nozzle 4 and have a first, gradually convergent tapered portion, which is followed by the Düsenengste with circular cross-sectional area. Both nozzles 16, 16 'are arranged at the same radial distance from the longitudinal axis 17 of the jet pipe 18. During operation of the jet pipe 18, as well as during operation of the jet pipe unit 1 ', a hollow jet or a hollow jet-like extinguishing jet is generated.

In the described nozzles are exemplified nozzles, which accelerate the in the jet pipe through the rotary feedthrough 10 guided extinguishing agent is used. Due to the high pressure applied by the extinguishing agent supply 14, but also due to the extinguishing agent acceleration within the respective nozzle 4, 4 'or 15, the respective extinguishing jet exits the nozzle or the jet pipe at high speed. The exit velocity depends on the applied pressure and the configuration of the respective nozzle. The respective emerging extinguishing agent jet may have supersonic speeds. The exit of the extinguishing agent jet at such a high speed supports the extinguishing jet bundling and ensures that the escaping extinguishing agent jet remains concentrated over a longer distance before the desired extinguishing agent mist is formed.

FIG. 4 shows a jet pipe unit 19 according to a further embodiment, which is constructed with respect to the drive and the extinguishing agent supply as the previously described jet pipe unit 1. The jet pipe unit 19 includes a connected to the rotary feedthrough 20 collector 21, at the multiple individual nozzles 22 with their respective Tubular body are connected. Overall, seven individual nozzles 22 are connected to the collector 21, as this in the front view of FIG. 5 the jet pipe unit 19 can be seen. The jet pipes 22 of the jet pipe unit 19 are designed in this embodiment as to FIG. 1 2. From the illustration of the jet pipe unit 19 according to FIG. 5 It is clear that the jet pipe unit 19 has a central jet pipe 22 and six, each with the same angular distance at a radial distance from the central jet pipe 22 arranged further jet pipes 22. In the jet pipe unit 19, the entire unit consisting of the collector 21 and the jet pipes 22 is driven in rotation. Due to the radial distance of the outer jet tubes 22 from the axis of rotation of the jet tubes 22, which axis of rotation corresponds to the longitudinal axis of the centric jet tube 22, an extinguishing agent jet is generated with a larger beam diameter than that in the to FIGS. 2 and 3 described eccentrically arranged nozzles is the case. The provision of several jet pipes, each with the same radial distance from the centric jet pipe also allows the transport of a larger amount of extinguishing agent. Due to the radial distance of the outer radiant tubes 22 from the axis of rotation is the Rotation speed of the discharged extinguishing agent jet correspondingly high.

FIG. 6 shows a in this respect the jet pipe arrangement of FIG. 5 modified arrangement of jet pipes 22 'of a further jet pipe unit 19'. Also in this embodiment, the individual beam tubes 22 are arranged at the same angular distance from each other. In contrast to the arrangement of FIG. 5 concerning the jet tube unit 19, two jet tubes 22 'are arranged at the jet tube unit 19' at a mean distance from the axis of rotation of the unit.

In the case of jet pipe units which have a plurality of jet pipes, as is described by way of example with respect to the jet pipe units 19, 19 ', the individual jet pipes 22, 22' can have an outlet valve in order to be able to block the extinguishing agent outlet of individual jet pipes if necessary. In this way, a further modification and adaptation of the extinguishing agent jet is possible.

FIG. 7 shows a jet pipe unit 23 according to yet another embodiment, which is constructed in principle as to FIGS. 4 to 6 described jet pipe unit. In contrast to the jet pipe unit 19, 19 ', in the case of the jet pipe unit 23, the outer jet pipes 24 are adjustable relative to the collector 25, as in FIG FIG. 7 indicated. By adjusting the outer beam tubes 24, in which adjustment the longitudinal axis of the jet tubes 24 is tilted by a few degrees with respect to the axis of rotation of the jet tube unit 23, an extinguishing agent jet can be generated, which rotates about its longitudinal axis and also has a certain conicity. The jet pipe unit 23 is in FIG. 7 shown in a position in which the outer beam tubes 24 are set slightly outwardly to produce a slightly enlarging extinguishing agent jet. Likewise, it is possible to incline the jet pipes 24 inwardly with respect to the axis of rotation.

The jet pipe unit 23 has a telescopic housing 26, which on the one hand serves to protect the jet pipes 24 and, on the other hand, supports the jet pipes 24 which are articulated in the area of their rear end relative to the collector 25. The outer jet pipes 24 are based on centrifugal force on the inside of the telescopic housing 26 with rotating unit. This carries on its outer part 27 for this purpose inside a support ring 28. The outer part 27 is opposite the fixed part 27 'of the telescopic housing 26, as indicated by the arrow in FIG FIG. 7 indicated, adjustable by means of a thread, by a rotational movement of the two parts 27, 27 'against each other. The support ring 28 is segmented in a manner not shown. Each segment of the support ring 28 is movable via a plunger 29 in the radial direction to the axis of rotation. By applying a rotational movement to the outer part 27 of the telescopic housing 26, the plunger 29 is pressed in the longitudinal direction of the jet pipe unit 23 in the outer part 27 'in accordance with the slope of between the parts 27 and 27' located thread and consequently the support ring segments, the back of the abut other end of the plunger 29 with a slope moves. An active provision of the support ring segments 28 is not necessary. To secure the two parts 27, 27 'of the telescopic housing 26 against each other serves a non-illustrated in the figures rotation.

FIG. 8 shows a Strahlroheinheit 30 according to another embodiment. The jet pipe unit 30 is basically constructed like the jet pipe unit 19 of FIG FIG. 4 , The jet pipe unit 30 has, in addition to the jet pipe unit 19 of FIG FIG. 4 via a connection and disconnection device 31, which is arranged in the collector 32. The supply and shutdown device 31 is used to connect and / or shutdown of individual jet pipes 33. Thus, in the jet pipe unit 30 to be formed extinguishing agent beam additionally modulated or adjusted by supply and / or cut-off individual jet pipes 33. The use of such a supply and disconnection device for connecting or disconnecting individual jet pipes 33 is particularly useful when the jet pipes have at least partially different nozzle shapes. This expands the possibilities of forming the extinguishing agent jet as a function of which jet pipes are switched on and / or off. Such switching on and off can also be done during operation, so that in the process of the extinguishing agent beam generation this can also be changed in this regard.

The jet pipe unit 30 further has a housing 34, which is also provided in the illustrated embodiment as a protective measure. The formed from the two annular cylindrical housing parts 35, 36 housing 34 is coupled to the rotational movement of the collector 32. The housing part 36 is opposite the housing part 35, as indicated by the arrow in FIG FIG. 8 indicated, movable. The housing part 35 has a feed channel 37, via which an additional medium, for example a gas, such as compressed air, can be injected into the interior of the outer cylindrical housing part 36. By such a measure, the shape of the exiting extinguishing agent jet can be influenced. In particular, this can thereby undergo additional stabilization. The supply of such a carrier gas is preferably swirl-shaped. Such a gas, for example compressed air, can in principle also be supplied via the collector 32, for which purpose the supply channel has a connection to a gas line arranged in the collector for this purpose. In principle, an embodiment is also possible in which the collector itself carries openings for the gas outlet. Basically, these gas outlet openings can also be tubes fastened to the collector, which are arranged between the jet tubes 33.

FIG. 9 shows a development of the jet pipe unit 30. The in FIG. 9 illustrated jet pipe unit 38 is constructed as well as the jet pipe unit 30, but in contrast to the jet pipe unit 30, the housing 39 of the jet pipe unit 38 is decoupled against a rotational movement of the collector with the jet pipes, as schematized by the ball bearings 40 in FIG. 9 is shown.

FIG. 10 shows in a highly schematic and not to scale representation of the jet pipe unit 19 of FIG. 4 when dispensing an extinguishing agent jet 41. As a result of the rotation of the jet pipes 22, the extinguishing agent jet 41 rotates on its exit from the jet pipe unit 19 about its longitudinal axis, which thus represents the extension of the axis of rotation of the jet pipe unit 19. In a first throw of the extinguishing agent jet, the extinguishing agent jet remains concentrated due to the high exit velocity and the impressed rotation due to the pressure of the pending liquid extinguishing agent. This portion of the extinguishing agent jet 41 is in FIG. 10 designated by the reference numeral 42. At this section 42 of the extinguishing agent beam is followed by a section in which the extinguishing agent jet 42 explosively increases its cross-sectional area over a short distance with a rapid decrease in velocity. This takes place with formation or distribution of smallest extinguishing agent droplets, so that an extinguishing agent mist 43 is formed. The extinguishing agent mist formation is also supported by the dynamic pressure acting as a result of the high exit velocity of the extinguishing agent jet.

It is considered possible that the generation of a supersonic extinguishing agent jet promotes the above-described spread or formation of the extinguishing agent mist by the transition from laminar flow conditions to turbulent flow conditions.

The described design of the jet pipe unit requires only a small extinguishing agent consumption, which is lower compared to an operation of previously known jet pipe units with formation of an extinguishing agent jet by a multiple. Therefore, equipped with such a nozzle unit fire-fighting vehicles based on the entrained extinguishing agent amount significantly longer by extinguishing an active fire fighting support without the extinguishing agent supply would have to be refilled. The low extinguishing agent consumption is also advantageous in the event that instead of water as extinguishing agent, another liquid extinguishing agent or water are used with an extinguishing agent additive, since the area of the source of fire only by a small amount of the extinguishing agent used - should it not be water - is charged ,

The invention has been described above with reference to some possible embodiments. Without departing from the subject matter of the invention, numerous further embodiments will be apparent to a person skilled in the art without departing from the subject matter of the invention.

LIST OF REFERENCE NUMBERS

1, 1 '

lance unit

2

lance

3

pipe body

4, 4 '

jet

5.5 '

longitudinal axis

6

hydraulic motor

7

pulley

8th

belt

9

belt guide

10

Rotary union

11

Interior of the tubular body

12

convergent section

13, 13 '

Section with smallest nozzle diameter

14

Extinguishing agent supply

15

nozzle configuration

16, 16 '

jet

17

longitudinal axis

18

lance

19, 19 '

lance unit

20

Rotary union

21

collector

22, 22 '

lance

23

lance unit

24

lance

25

collector

26

telescopic housing

27

outer part

27 '

fixed part

28

support ring

29

tappet

30

lance unit

31

Connection and disconnection device

32

collector

33

lance

34

casing

35

housing part

36

housing part

37

supply channel

38

lance unit

39

casing

40

ball-bearing

41

Extinguishing jet

42

bundled section

43

Extinguishing agent mist

Claims (14)

1. Extinguishing agent output jet pipe unit, comprising at least one jet pipe (2, 2', 18, 22, 22', 24), which can be acted upon with pressurised extinguishing agent, with a pipe body (3) having an extinguishing agent inlet opening and with an extinguishing agent outlet formed from at least one nozzle (4, 4', 16, 16'), wherein the at least one nozzle (4, 4', 16, 16') is rotationally movable around its longitudinal axis (5) and/or along a circular path concentrically enclosing the rotational axis, characterised in that

   - the at least one nozzle (4, 4', 16, 16') is connected to the pipe body (3) of the jet pipe (2, 2', 18, 22, 22', 24) in a torque-locking manner,

   - a drive apparatus is provided for rotational driving of the jet pipe (2, 2', 18, 22, 22', 24) and a rotational passage (10, 20), through which the extinguishing agent is guided, is provided for supply of the extinguishing agent into the pipe body and

   - the jet pipe unit (1, 1') has a jet pipe (2, 2') rotationally driven around its longitudinal axis or the jet pipe unit (19, 19', 23) has a plurality of jet pipes (22, 22', 24) arranged at a distance to the rotational axis and expediently at the same angular distance to one another.
2. Extinguishing agent output jet pipe unit according to claim 1, characterised in that
   the extinguishing agent is present with a pressure of more than 200 bar, in particular of more than 500 bar at the extinguishing agent inlet opening of the jet pipe (2, 2', 18, 22, 22', 24).
3. Extinguishing agent output jet pipe unit according to claim 1 or 2, characterised in that
   the at least one nozzle (4, 4', 16, 16') forming the extinguishing agent outlet opening of the jet pipe is an acceleration nozzle.
4. Extinguishing agent output jet pipe unit according to claim 3, characterised in that
   the nozzle (4, 4', 16, 16') has, in a first portion in the direction of flow of the extinguishing agent flowing through it, a convergent taper (12), which tapering portion (12) adjoins the smallest diameter of the nozzle (4, 4', 16, 16'), which smallest diameter is less than 2 mm, in particular approximately 1 mm.
5. Extinguishing agent output jet pipe unit according to one of claims 1 to 4, characterised in that
   the jet pipe (2') has at least one nozzle (4') arranged eccentrically to the longitudinal axis (5') of the jet pipe (2').
6. Extinguishing agent output jet pipe unit according to one of claims 1 to 4, characterised in that
   the jet pipes (22, 22', 24) are connected with their water inlet opening to a collector (21, 25) connected to a rotational passage (20) through which extinguishing agent is guided.
7. Extinguishing agent output jet pipe unit according to one of claims 1 to 6, characterised in that
   one or more of the jet pipes (24) arranged at a distance to the rotational axis are adjustable in order to set the diameter of the extinguishing agent jet with regard to the alignment of their longitudinal axis to the rotational axis of the jet pipe unit (23).
8. Extinguishing agent output jet pipe unit according to one of claims 1 to 7, characterised in that
   the individual jet pipes (33) are connected to an activation and deactivation device (31) by means of which an inflow of extinguishing agent into the jet pipe (33) can be activated or deactivated.
9. Extinguishing agent output jet pipe unit according to one of claims 1 to 7, characterised in that
   the jet pipe unit has a housing which closes in the individual jet pipes (24, 33).
10. Extinguishing agent output jet pipe unit according to claim 9, characterised in that
    the housing (34, 39) comprises two housing parts (35, 36) which are movable relative to one another.
11. Extinguishing agent output jet pipe unit according to claim 9 or 10, characterised in that
    the housing (34, 39) has a delivery duct (37).
12. Method for forming an extinguishing agent fog, characterised by

    - providing a pressurised liquid extinguishing agent, for example water,

    - supplying the extinguishing agent to a jet pipe unit, comprising at least one jet pipe with one or more nozzles as an extinguishing agent outlet opening,

    - generating an extinguishing agent jet (41) with a first jet portion (42), which substantially defines the throw, in the form of a directed jet and with a portion adjacent in the throw direction in which the jet increases the size of its cross-sectional surface by a multiple factor alongside a rapid reduction in speed over a short distance for formation of the extinguishing fog (43) by generating an extinguishing agent jet rotating around its longitudinal axis by bringing into rotation the at least one nozzle of the jet pipe unit and/or of the jet pipe unit around a rotational axis corresponding to the extension of the longitudinal axis of the extinguishing agent jet.
13. Method according to claim 12, characterised in that
    the extinguishing agent is provided with a pressure of at least 200 bar, in particular of more than 500 bar.
14. Method according to claim 12 or 13, characterised in that
    the extinguishing agent exits from the at least one nozzle at high speed, in particular at ultrasonic speed.

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