EP4082631A1 - Linear e-extinguishing lance with position retainer for fighting fires in electrically charged objects - Google Patents

Abstract

An extinguishing arrangement with an extinguishing lance (10) for extinguishing burning electrical equipment, which has a holding section with a handle part (11), an extinguishing agent feed with a coupling device (12) for connecting a pressure hose and a tubular extinguishing section (13) connected to the holding section with a longitudinal axis (z), from the free end of which extinguishing agent can be introduced under pressure into a burning object, the handle part and the extinguishing section having a coating (11a; 13a) that isolates voltages U ≥ 500V, the extinguishing section being made of one material which has such a high tensile strength R_m that it withstands a mechanical stress σ ≥ 500 N/mm² and which has a melting temperature t<sub>S</ sub> ≥ 650°C, the quenching section being designed to taper geometrically at its free end and having a narrowed clear flow cross-section for the pressurized dur chducted extinguishing means, wherein the extinguishing section and its tapering free end are made of stainless steel, and the free end is additionally hardened, is characterized in that it comprises a position holder (30) which is designed in such a way that the extinguishing lance can be held by a can be held at a lateral distance from it in a geometric position in which the longitudinal axis (z) of the extinguishing section is aligned at an angle of between 60° and 90° to the surface of the earth, while an extinguisher operates the extinguishing lance. This enables an ergonomically simpler and more effective operation of the E-extinguishing lance in the event of an emergency and the safety of the operators is once again significantly increased.

Description

The invention relates to an extinguishing arrangement with a linear extinguishing lance for extinguishing burning electrical equipment, such as vehicles equipped with an electric motor, the extinguishing lance having a holding section with a handle for an operator, an extinguishing agent feed with a coupling device for connecting a pressure hose for liquid extinguishing agent, and a the holding section and optionally the coupling device adjoining linear tubular extinguishing section with a longitudinal axis, from the free end of which extinguishing agent can be introduced under pressure into a burning object, wherein the handle part and the tubular extinguishing section have a voltage-isolating coating, at least in the area of the holding section, which is electrically insulating is also designed for electrical voltages U ≥ 500V, the tubular extinguishing section being made of a material which has such a high tensile strength R _m that it can withstand a mechanical stress σ ≥ 500 N/mm ² and which has a melting temperature t _S ≥ 650°C, the tubular extinguishing section tapering to a point at its free end opposite the holding section and having a narrowed clear flow cross-section for the extinguishing agent fed through under pressure, wherein the tubular quenching portion and also the tapered free end of the tubular quenching portion are made of stainless steel, and wherein the tapered free end of the tubular quenching portion is additionally hardened.

Such an E-Löschlanze is known from DE 20 2020 102 574 U1 (=Reference [1]).

Background of the Invention

For reasons of environmental and climate protection as well as sustainability, there are currently intensive international efforts to increasingly use electrical energy instead of fossil fuels. In recent years, for example, photovoltaic systems have increasingly been installed on building roofs. In addition, individual mobility is to be increasingly made possible in the future by electric drive systems, for example electric vehicles.

So far, however, little attention has been paid to the fact that such an increased use of electrical energy also entails considerable potential risks.

In view of numerous fire events occurring worldwide due to non-functioning or only poorly functioning accumulators, for example in smartphones or notebooks, these potential dangers are already being indicated to an increasing extent.

A particularly high risk is seen in fires in the vicinity of electric vehicles, for example hybrid or fully electric vehicles (see, for example, "E-mobile fire in the USA"; https://www.welt.de/motor/news/ article120704501/E-Mobil-Brand-in-den-USA.html (= reference [3], retrieved on 09.11.2016)).

A particular problem in the event of a fire in such an electric vehicle is that when extinguishing it, there are not only significant risks from the fire and the fire itself, as well as possible self-igniting elements such as Lithium-ion accumulators go out, but also the dangers of spreading high voltages or high currents due to the high-performance electrics or accumulators installed in the vehicle must be controlled. It is therefore important to prevent this effectively.

the DE 10 2018 222 429 A1 (=Reference [12]) describes an emergency set for an electrically powered vehicle with a traction battery and an extinguishing lance access, which contains an extinguishing lance template.

In the US-A 4,802,535 (=Reference [4]) describes a fire extinguishing lance constructed linearly along a longitudinal axis, in which hardened steel pipe is proposed as the material for the tubular extinguishing section. However, no electrical insulation of any kind is provided for the known extinguishing lance.

the US 2003/0159837 A1 (=Reference [5]) shows a "multi-purpose water hammer" with a pointed nozzle intended to penetrate an object to be extinguished when used. The erasing head is placed on the tubular erasing section at an angle of 90°. This is therefore not an extinguishing lance constructed linearly in the z-direction according to the generic term defined at the outset. For a hammer-like use of this device in an electric vehicle, you would have to work very close to the battery to be extinguished when hammering into the outer shell of the vehicle in order to achieve an effective effect at all. Incidentally, no electrical insulation of the extinguishing lance is provided or indicated here either. In the years 2002 and 2003 people probably didn't think of vehicles with electric drives as they do today.

A likewise non-linear constructed, but rather relative to a longitudinal axis at right angles "bent" extinguishing lance is in the CN 106 492 384 A (=Reference [11]) disclosed. For the same reasons as the extinguishing device according to reference [5], this non-generic arrangement is totally unsuitable for the purposes of the present invention.

In the U.S. 2002/019307 A1 (=Reference [6]) insulation against electrical voltage when in contact with wires in a building wall is indicated, but no insulation against high voltage, such as that found in batteries in electric vehicles. In addition, the extinguishing agent is fed in via the end of the known extinguishing lance constructed linearly in the z-direction, so that it is not possible to drive the lance into the outer shell of a vehicle with a striking tool. Such a conventional extinguishing lance is suitable for extinguishing buildings and possibly also burning conventionally powered vehicles, but by no means for extinguishing burning electric vehicles, mainly because - in contrast to normal buildings (apart from electricity power plants ) and the usual high electrical voltages U >> 200V to be expected in vehicles.

This is proven, among other things, by the magazine article "MOBILES LIFE - WHAT IF IT BURNS?" from the magazine "stern" from June 19th, 2019, p.80 (= reference [7]). It is popularly shown that electric vehicles with high-voltage batteries - which, as is well known, are to replace conventional vehicles powered by internal combustion engines as completely as possible in the very near future for environmental reasons - pose a very serious risk to life and limb for firefighters who use such burning electric -Vehicle to delete goes out.

Such an extinguishing action with a conventional extinguishing lance of the type described above obviously cannot be carried out with the necessary safety.

Instead, in DE 10 2016 211 854 B3 or. EP 3 263 402 B1 (=Reference [8]) proposed a special container, which contains extinguishing water, in which a burning electric vehicle should be completely submerged - a truly desperate idea:
Imagine: An electric vehicle catches fire on a busy street. But instead of - as usual - extinguishing the burning vehicle on site, the fire brigade first has to get a huge special container, fill it with a huge amount of fire-fighting water on site and then the electric vehicle, which is still on fire but has probably already burned out completely - somehow, anyway- dip in this big container. How this is to be accomplished in a larger vehicle such as an electrically powered bus or truck remains entirely open.

Also the magazine article "ELEKTRIZING USE" from the fire brigade trade journal "BRANDHEISS" in the July-August 2018 issue, p.16 (= reference [9]), describes from the point of view of the specialist - namely the fire brigade - the Local experts new and very dangerous situation when extinguishing a burning electric car. Literally it says here: "Although the burning small electric transporter had rather manageable dimensions, the comrades of the FF Traun were quite challenged." ... "Especially in the first phase, the fire-fighting operation was precarious, as vehicles with electric drives have to be extinguished and treated completely differently than conventional cars. into a "bath of water" because the burnt and destroyed batteries still pose an enormous fire hazard several hours later. Therefore, the destroyed vehicle was escorted on a truck tow truck by two fire engines with flashing blue lights directly to an industrial area in Traun, where it was placed in an environmentally protected area to prevent leakage , deep water bath was let in." ... "LARGE EFFORT FOR SMALL VEHICLE" ...

However, if there is no way of finally extinguishing a burning electric vehicle using a special container filled with water, the only alternative is often to continue the extinguishing process until the electrical components in particular can no longer be reignited. In such a case, the consumption of extinguishing water is immense, as a particularly impressive, very recent example from the USA shows. In the digital edition of the Süddeutsche Zeitung, the article "The driver's seat was empty" from April 19, 2021 (= reference [10], retrieved on April 20, 2021) reports how after an accident with an electric car in Harris County in Texas, USA, firefighters needed more than 100,000 liters of water to put out an electric vehicle that caught fire because the batteries kept igniting.

A particularly high risk is seen in fires in the vicinity of electric vehicles, for example hybrid or fully electric vehicles (see, for example, "E-mobile fire in the USA"; https://www.welt.de/motor/news/ article120704501/E-Mobil-Brand-in-den-USA.html (= reference [3], retrieved on 09.11.2016)).

This underlines the great urgency of finding a technically significantly better, safer and also much more economical solution to the problems of extinguishing burning electric vehicles than suggested in reference [8].

In addition to the actual extinguishing problems, the extremely negative consequences for the environment must also be considered: After the extinguishing operation described in reference [9] above, the destroyed vehicle was also placed in a "water bath" and "dunk" with enormous effort. But even before that - through the actual deletion process - an enormous amount of high-grade contaminated extinguishing water was released into the environment, but the article does not report on this.

In the event of a vehicle fire, the usual and well-known mixture of respiratory poisons always occurs. In addition, there are other, very significant amounts of very dangerous respiratory toxins as a result of the "thermal runaway" of the lithium-ion battery. Thus, primarily as a result of the decomposition of the conductive salt present in the electrolyte, lithium hexafluorophosphate (LiPF), hydrofluoric acid (HF), phosphoryl fluoride (POF) and phosphoric acid are released. If a burning or still smoldering electric vehicle is transported further, these dangerous substances continue to escape and contaminate the environment. With the use of the E-extinguishing lance according to the invention, this pollution of the environment is also significantly reduced and only a small amount of water (20-50 liters) is contaminated by the extinguishing operation.

So far, firefighters have only been prepared to a very limited extent, usually not at all, for dealing with such sources of danger. In the above-mentioned articles, for example, it is reported that the firefighters fighting a fire in an electric vehicle kept or had to keep a clear spatial distance from the electric vehicle, which of course considerably limits the effectiveness of firefighting or reduces the positive effect of the firefighting measures that are known per se , if not impossible.

In order to deal with such extended dangers, a completely new type of e-extinguishing lance is required, which is not only designed for actual extinguishing, but can also withstand thermal as well as mechanical and, in particular, electrical dangers.

For the first time with the -linear in z-direction built- E-extinguisher according to DE 20 2017 104 411 U1 such as WO 2019/020507 A1 (=Reference [2]), the prior art has succeeded in providing the extinguishing tool against thermal and/or mechanical hazards and also with high-voltage protection. A comparable linear E-extinguishing lance had not previously been suggested to the relevant expert, at least apparently not by the conventional extinguishing devices described in references [6] to [8].

However, even this new type of e-extinguishing lance does not completely and comprehensively ensure that the -comparatively strict- legal standards for electrician's tools can be complied with. So there is still the risk that when extinguishing live electrical objects - especially when the extinguishing lance is wet, which is actually typical for the application - electrical voltages or currents from the electrically non-insulated tubular extinguishing section to an impermissibly high extent Reach the operator, who may be seriously injured or even killed as a result during firefighting operations.

The ones from the one cited above DE 20 2020 102 574 U1 (=Reference [1]) known E-extinguishing lance therefore ensures that the minimum requirements for protection against thermal hazards as well as protection against mechanical overloads and protection against electrical hazards are met by the tubular extinguishing section at least in the area of the holding section with handle has a voltage-isolating coating that is designed to be electrically isolating for electrical voltages U ≥ 500V.

object of the invention

It is the object of the present invention, with the simplest possible technical means, inexpensively and inexpensively, a extinguishing arrangement to modify the type defined at the beginning in such a way that an ergonomically simpler and more effective operation of the E-extinguishing lance is made possible in the event of an emergency and the safety of the operators is once again significantly increased.

Brief description of the invention

This task, which in practice saves and saves the operator's life, is solved by the present invention in an equally surprisingly simple and effective manner in that the extinguishing arrangement includes a position holder which is designed in such a way that the extinguishing lance can be used during an operating phase of an extinguishing operation can be held by an assistant at a lateral distance from the extinguishing lance in a geometric position in which the longitudinal axis of the tubular extinguishing section is aligned at an angle of between 60° and 90° to the earth's surface, while an extinguishing person operates the extinguishing lance in the extinguishing operation.

With the present invention, an extinguishing arrangement with a position holder and an E-extinguishing lance is provided, which completely solves the inventive object formulated above. In particular, the extinguishing arrangement according to the invention with position holder and e-extinguishing lance is especially suitable for lithium-ion batteries that are installed in electric vehicles. The fire brigades thus have an effective and all-round safe extinguishing system available for applications involving burning objects under high voltage.

When used, the E-extinguishing lance can be inserted into an electrical system, for example into the battery of a burning electric vehicle or an electronic generator. For this purpose, the e-extinguishing lance is positioned over the electrotechnical system by a positioner and an operator drives the e-extinguishing lance into the electrotechnical system with its tip System, in the case of an electric vehicle usually through the vehicle floor. With the help of the position holder, the positioner can easily and automatically maintain a critical distance from the burning electrical system as well as from his or her colleague. In this way, the risk of being injured as a result of an electrical accident is minimized for all firefighters directly involved in the action to extinguish the burning electrical equipment.

Furthermore, the distance between the operator and the positioner can be regulated and increased by the position holder. In particular, in confusing situations (e.g. if there is a lot of smoke) or in situations in which you have to react particularly quickly (e.g. if there is a risk of explosion if you act too hesitantly), the immediate danger can be minimized that the operator will accidentally hit the positioner and injure it and thus additionally jeopardizes the extinguishing attempt and the positioner. In addition, the position holder can increase the distance to the burning object for both actively acting firefighters, which can also reduce the heat radiation on the emergency services.

When inserting the e-extinguishing lance into an object to be extinguished, the tip in the front area can easily pierce material that is in the way, such as a floor panel or a battery wall. Such a high-strength, yet pointed nozzle avoids or at least minimizes wear and tear, while facilitating penetration into the surface of the object to be extinguished.

Flow-restricted nozzle(s) at the tip of the lance also ensure that sufficient extinguishing success can be achieved quickly and efficiently and, in particular, with a relatively small amount of extinguishing water.

There is currently no alternative way of extinguishing an e-vehicle battery directly and at the same time safely for the firefighters on the market, anywhere in the world. In numerous tests, the factory fire brigades of well-known automobile manufacturers hardly ever found fires in electric vehicles without the position holder with electric extinguishing lance according to the invention, and if they did, then only with the use of an extremely large amount of water and foam, but always without effective safety for the fire fighter acting against high levels electrical voltages, can get under control.

Incidentally, the situation is very similar when extinguishing transformers, electrical generators or other high-voltage devices that have caught fire, such as those used in photovoltaic systems.

Preferred embodiments and developments of the invention

In a particularly preferred class of embodiment of the extinguishing arrangement according to the invention, it is provided that the position holder has a tubular holding part with a longitudinal axis which projects laterally away from the extinguishing lance during operation, preferably approximately at right angles to the longitudinal axis of the tubular extinguishing section.

The holding part allows an operator to hold the extinguishing lance comfortably in its operating position. The operator can easily drive the extinguishing lance into the object to be extinguished while the positioner on the position holder is securely positioned at a distance. The right-angled alignment of the holding part to the e-extinguishing lance makes it particularly easy to align the lance and to hold it stably and precisely in an optimal extinguishing position.

A further preferred embodiment of the extinguishing arrangement according to the invention is characterized in that the position holder is permanently attached to the extinguishing lance.

This is a particularly simple and compact design, which is also cheap to manufacture. In addition, a standardized operation can be achieved in this way, with an operator being able to quickly grasp the way in which the position holder is used. The arrangement is still easy to understand haptically, which enables uncomplicated use.

However, alternative embodiments of the extinguishing arrangement can also be advantageous, in which the position holder is detachably fastened to the extinguishing lance at least for the duration of an operating phase.

This allows the operator to react quickly to the current requirements on site and, if necessary, to optimally adjust the geometry of the position holder with just a few simple steps. For longer-lasting fire-fighting operations or fire-fighting operations with a limited radius of action, the operator can select the safest and most ergonomic setting for him. Space can thus also be saved between the extinguishing operations during transport and storage of the extinguishing arrangement and its pack size can be reduced.

A further development is particularly advantageous in which the tubular holding part of the position holder has a voltage-insulating coating which is designed to be electrically insulating for electrical voltages U≧500V.

This isolation can prevent the operator or positioner from receiving an electric shock when extinguishing an electrotechnical system. The stress-isolating coating can be arranged in the grip area of the position holder. At the same time, it can then mark the gripping area for the operator. In addition, the voltage-isolating coating offer protection against the cold, for example when extinguishing with heavily chilled water or other extinguishing fluid. In addition, it can have an impact-dampening effect if, for example, the extinguishing lance is driven into the electrical system by an operator.

A preferred development of this embodiment provides that the stress-isolating coating of the tubular holding part has a layer thickness d≧2 mm, in particular between 2 mm and 5 mm, and is designed to be electrically insulating for electrical voltages U to 1000 V and above.

These are layer thicknesses of the stress-isolating coating that have been particularly tried and tested in practice. The insulating effect of the stress-isolating coating can be further improved by selecting a larger layer thickness.

In a further advantageous development, the tubular holding part of the position holder is made from aluminum, in particular from an Al alloy, preferably from about 30 mm thick AlCuMgPb, and the stress-isolating coating of the tubular holding part is made from polyvinyl chloride.

These materials have proven particularly effective in practice at this point. Aluminum and Al alloys such as AlCuMgPb have a low density of about 2.5 g/cm ³ to 3 g/cm ³ and are therefore lighter than, for example, different steels that could be used for similar components. As a result, the weight of the tubular holding part of the position holder can be kept particularly low, which is important for quick and uncomplicated operation of the extinguishing arrangement. In addition, aluminum components are inexpensive to manufacture and very resistant to corrosive attack. Polyvinyl chloride (PVC) has a high tracking resistance (i.e. the insulation resistance of the surface of insulating materials). This is particularly important for the stress insulating coating of the tubular support member. Components made of PVC are also inexpensive to produce and have a long service life.

Also preferred is a further development of the invention in which the tubular holding part of the position holder can be mechanically coupled reversibly to the extinguishing lance by means of a mechanical coupling device, in particular a clip, a clip, a fork or pliers.

In this way, quick installation can be achieved in areas that cannot be seen and in confusing situations. The tubular holding part can be assembled in a simple manner and the assembly is simplified to such an extent that even a technical layman can immediately be put in a position to attach the tubular holding part to the extinguishing lance without any problems. The safe and correct assembly of the tubular holding part is thus improved, particularly in hectic situations in which potentially fatal errors can accumulate.

Also preferred is a further development of this embodiment, which is characterized in that the mechanical coupling device is rigidly attached to the tubular holding part of the position holder.

This allows the position holder to be moved and attached particularly precisely. Slipping can thus be reliably prevented. This will improve the handling of the entire extinguishing arrangement according to the invention.

Also particularly advantageous is a development in which the mechanical coupling device has a two-part clamp, the two halves of which are each constructed in a C-shape and the two ends of which are opposite one another in an operating phase of the quenching arrangement, the clamp being around the outer circumference of the tubular extinguishing section, preferably in the area of the holding section with the handle part, and the two opposite ends of the C-shaped halves are each brought closer to one another by means of a clamping device, so that the clamp is pulled together around the tubular extinguishing section and clamps it around .

In this way, the position holder with the mechanical coupling device can be connected to the tubular extinguishing section or released again in a particularly simple, quick and uncomplicated manner.

Also advantageous are variants of this development of the invention which provide that the clamping devices include a hinge and/or a clamping screw.

The hinge or the clamping screw can facilitate handling of the extinguishing system according to the invention in such a way that there is no risk of the C-shaped halves of the mechanical coupling device falling apart when the clamping device is opened. This prevents these parts from getting lost, especially in situations where it is difficult to assess the situation or where visibility is restricted, for example due to smoke from the source of the fire. In addition, the extinguishing arrangement can be put into a ready-to-use state more quickly as a result.

Also advantageous is a variant which provides that the clamping screw has a threaded bush, a threaded bolt, a threaded pin and a screw handle, in particular a star handle.

The components can be installed securely and thus cannot be lost during use of the extinguishing arrangement. A clamping screw designed in this way is particularly easy to operate and the E-extinguishing lance can be quickly and securely connected to the position holder via the mechanical coupling device.

Also preferred is an embodiment of the extinguishing arrangement according to the invention which provides that the tubular holding part is designed to be extendable with respect to its longitudinal axis.

This makes it possible to increase the distance between the e-extinguishing lance and the positioner on the position holder. This distance can be increased so that, for example, when extinguishing an electrical system that has caught fire, the distance between the burning object and the positioner is sufficiently large, for example 1 meter, so that the firefighters involved pose little or no danger when trying to extinguish the fire .

A development in which the tubular holding part can be pulled apart or compressed like a telescope is also particularly advantageous.

This is technically particularly easy to implement in practice and can represent a simple and compact possibility of varying the length.

However, an alternative development can also be advantageous in which the tubular holding part has a base part and one or more extension pieces which can be connected to the base part in the direction of the longitudinal axis, preferably screwed to it and optionally to one another.

The distance from the operator of the position holder to the E-extinguishing lance can be further increased by the extension pieces. In particularly confusing and dangerous situations, the extinguishing lance is held in position from a safe distance and the safety of the operators is guaranteed.

Further advantages of the invention result from the description and the drawing. Likewise, the features mentioned above and those detailed below can be used according to the invention individually or collectively in any combination. The embodiments shown and described are not to be understood as an exhaustive list, but rather have an exemplary character for the description of the invention.

Detailed description of the invention and drawings

The invention is illustrated in the drawing and is explained in more detail with reference to exemplary embodiments.

Fig. 1

eine Ausführungsform der erfindungsgemäßen Löschanordnung in einer praxisnahen Anwendung mit einem Positionierer, der den Positionshalter bedient, und einem Bediener, der die E-Löschlanze mit einem Hammer in das zu löschende Objekt eintreibt;

Fig. 2a

eine schematische Seitenansicht einer Ausführungsform einer Löschlanze, wie sie in der erfindungsgemäßen Löschanordnung verwendet werden kann, mit spannungsisolierender Beschichtung des rohrförmigen Löschabschnitts im Bereich des Haltegriffs;

Fig. 2b

die Ausführungsform von Fig. 2a in einer teilweise transparenten Ansicht von oben in Richtung der Achse des rohrförmigen Löschabschnitts;

Fig. 3a

eine schematische Seitenansicht eines Verlängerungsstücks zur Verlängerung der axialen Länge des rohrförmigen Halteteils in einem vertikalen Längsschnitt;

Fig. 3b

eine schematische Seitenansicht eines Basisteils des rohrförmigen Halteteils des Positionshalters in einem vertikalen Längsschnitt;

Fig. 4a

eine schematische Seitenansicht einer mechanischen Ankopplungsvorrichtung mit Blick auf den Bereich, in dem eine Klemmschraube für die Spannvorrichtung angebracht wird;

Fig. 4b

die Ausführungsform von Fig. 4a in einer schematischen Aufsicht in einem vertikalen Längsschnitt;

Fig. 5

eine schematische Seitenansicht der Einzelteile einer Klemmschraube zur Verwendung bei der mechanischen Ankopplungsvorrichtung von Fig. 4a.

Show it:

1

an embodiment of the extinguishing arrangement according to the invention in a practical application with a positioner who operates the position holder and an operator who drives the E-extinguishing lance into the object to be deleted with a hammer;

Figure 2a

a schematic side view of an embodiment of an extinguishing lance, as can be used in the extinguishing arrangement according to the invention, with a stress-isolating coating of the tubular extinguishing section in the area of the handle;

Figure 2b

the embodiment of Figure 2a in a partially transparent plan view in the direction of the axis of the tubular quenching section;

Figure 3a

a schematic side view of an extension piece for extending the axial length of the tubular holding part in a vertical longitudinal section;

Figure 3b

a schematic side view of a base part of the tubular holding part of the position holder in a vertical longitudinal section;

Figure 4a

a schematic side view of a mechanical coupling device with a view of the area in which a clamping screw for the tensioning device is attached;

Figure 4b

the embodiment of Figure 4a in a schematic plan view in a vertical longitudinal section;

figure 5

a schematic side view of the individual parts of a clamping screw for use in the mechanical coupling device of Figure 4a .

the 1 shows an embodiment of the extinguishing arrangement according to the invention in a practical application, in this case the extinguishing of a car with an electric motor. The extinguishing arrangement comprises an extinguishing lance 10 to which a position holder 30 and a pressure hose for liquid extinguishing agent is attached. An assistant (positioner) uses the position holder 30 to hold the extinguishing lance in position at a lateral distance from a tubular extinguishing section 13 . An operator (operator) strikes a striking plate 14' of a striking section 14 with a hammer to drive the extinguishing lance 10 into the object to be extinguished.

The tubular extinguishing section 13 is aligned in a longitudinal axis z to the earth's surface. The angle between the tubular extinguishing section 13 and the ground surface is approximately 90° in this illustration. At this angle, the best power transmission can be achieved when hitting. When deleting places that are difficult to access, it can also happen that the angle between the longitudinal axis z of the tubular deleting section 13 and the earth's surface is less than 90°. In an angular range of 60° to 90°, however, the operator can still optimally drive the extinguishing lance 10 into the object to be extinguished.

The position holder 30 is designed as a tubular holding part 31 with a longitudinal axis a which projects laterally away from the extinguishing lance 10 . In the case shown here, the longitudinal axis a of the tubular holding part 31 is arranged almost at right angles to the longitudinal axis z of the tubular extinguishing section 13 . This enables a particularly precise and simple positioning of the extinguishing lance 10 relative to the earth's surface.

The tubular holding part 31 consists of an approximately 30 mm thick AlCuMgPb alloy. In general, tubular holding parts 31 according to the invention can be made of aluminum or other Al alloys. The properties of these materials are of particular interest here, i.e. low weight due to the low density of aluminum or the Al alloys, good durability in general and good resistance to corrosion, as well as cost-effective production and processing.

The tubular holding part 31 can also be designed in such a way that it can be lengthened in the direction of its longitudinal axis a, for example in that it can be pulled apart or compressed like a telescope (not shown here). In the operating state, the distance between the extinguishing lance 10 and the assistant can be varied easily and flexibly. For example, the distance can be increased in high-risk situations, thereby reducing the risk of injury, or in situations where high precision is required the alignment of the e-extinguishing lance 10 is required, at least be reduced.

The tubular holding part 31 has a stress-insulating coating 30a . The voltage-isolating coating 30a should generally be designed in such a way that it has an electrically insulating effect for electrical voltages U≧500V and the risk of the assistant and the operator suffering an electric shock is thus minimized. In the present embodiment, polyvinyl chloride is used as the stress-insulating covering 30a because this material has high tracking resistance, good formability, and is inexpensive to manufacture. The layer thickness d of the stress-isolating coating 30a should be d≧2 mm (in particular in a range between 2 mm and 5 mm) in order to have an electrically insulating effect for electrical voltages U up to 1000 V and greater voltages.

In the embodiment shown here, the position holder 30 is also attached to the e-extinguishing lance 10 in such a way that the position holder 30 can be released again during operation, in particular after the extinguishing action has been completed. On the one hand, this enables the geometry of the extinguishing arrangement to be quickly adapted to the conditions at the place of use, and on the other hand, transport to and from the place of use in a compact form. In another embodiment, not shown here, the position holder can be permanently connected to the extinguishing lance. Such a structure is also easy to understand in terms of its functioning for people who are not technically gifted and can also be produced inexpensively.

The extinguishing lance 10 is mechanically coupled to the tubular holding part 31 of the position holder 30 by means of a mechanical coupling device 32 . The tubular holding part 31 is rigidly attached to the mechanical coupling device 32 . This prevents the position holder 30 from slipping off and the handling of the extinguishing arrangement can be further improved.

In the Figures 2a and 2b The drawing shows an improved embodiment of the electrically insulating E-extinguishing lance 10 according to the invention for extinguishing burning objects under electrical voltage. Like the improved E-extinguishing lance known from the closest prior art that goes back to the applicant himself, the E-extinguishing lance 10 used in the extinguishing arrangement according to the invention also has a holding section with a grip part 11 for an operator, an extinguishing agent feed with a coupling device 12 for connection a pressure hose for liquid extinguishing agent, as well as the tubular extinguishing section 13 adjoining the holding section and optionally the coupling device 12, from the free end of which extinguishing agent can be introduced under pressure into a burning object. The coupling device 12 is therefore set up and designed exclusively for the coupling of a pressure hose, and in no way for any type of spacer function. The handle part 11 of the holding section has a voltage-isolating coating 11a , which is also designed to be electrically insulating for electrical voltages U ≥ 500V, with the tubular extinguishing section 13 tapering geometrically to a point at its free end and having a narrowed clear flow cross-section for the extinguishing agent fed through under pressure having.

Compared to the applicant's known, older extinguishing lance, the e-extinguishing lance 10 used according to the invention is characterized in that the tubular extinguishing section 13 now also has a voltage-insulating coating 13a , at least in the area of the holding section with handle part 11, which is electrically insulating for electrical voltages U ≥ 500V is.

In particular, this stress-insulating coating 13a of the tubular extinguishing section 13 can have a layer thickness d ≥ 2 mm, in particular between 2 mm and 5 mm, at least in the area of the holding section with the grip part 11, and the stress-insulating coating 11a of the grip part 11 of the Holding section as well as the coating 13a of the erasing section 13 can even be designed to be electrically insulating for electrical voltages U to 1000V and above.

Furthermore, the tubular quenching section 13 can be constructed from VA steel, in particular from austenitic, acid-resistant 18/10 Cr-Ni steel, and the stress-isolating coating 13a of the tubular quenching section 13 can be constructed from polyvinyl chloride.

At the in the Figures 2a and 2b In the illustrated embodiment, the handle part 11 of the holding section has two loop handles 11', 11'' for operating the E-extinguishing lance 10 with both hands.

The e-extinguishing lance 10 used in the extinguishing arrangement according to the invention can have an actuating valve (not shown) on the extinguishing agent feed for letting in or stopping an inflow of extinguishing agent into the tubular extinguishing section 13 and on the holding section, preferably on the handle part 11, a trigger device for manual activation of this actuating valve exhibit.

Furthermore, the in Figure 2a The illustrated embodiment of the E-extinguishing lance 10 has the preferably replaceable impact section 14 on the operator-side end following the holding section in extension to the tubular extinguishing section 13, which serves to introduce impact force in the direction of the longitudinal axis of the extinguishing lance 10 in order to direct it into an object to be extinguished to drive. On the side remote from the operator, the free end of the extinguishing lance 10 is designed as a preferably likewise exchangeable and particularly hardened tip 15 .

In the Figures 3a and 3b In the drawing, a base part 35 and an extension piece 35' of the tubular holding part can be seen in a schematic side view in a vertical longitudinal section. The extension piece 35' is tubular. One end includes a threaded bolt which protrudes approximately halfway out of the extension piece 35', and the other end has a threaded bore for a threaded bolt. The extension pieces 35' can be screwed together via the threaded holes and the threaded bolts.

The base part 35 is tubular. The end on the handle side is designed in a hemispherical shape for more comfortable handling. The connector end includes a threaded bolt that protrudes approximately halfway out of the base portion 35 . The base part 35 can be connected either directly to the mechanical coupling device or to one or more extension pieces 35' assembled together. This allows the length of the tubular holding part to be flexible.

the Figures 4a and 4b show the mechanical coupling device 32 from different views. The mechanical coupling device 32 is formed here as a clamp. In other embodiments, not shown here, it is also possible to choose a clamp, a fork or a pair of pliers as the mechanical coupling device 32 .

The coupling device 32 designed as a clamp consists of two halves 32', 32", which are C-shaped here. Half 32' includes both ends 32a', 32b' and half 32" includes both ends 32a", 32b ". In the form shown here, the ends 32a′ and 32a″ and the ends 32b′ and 32b″ are opposite one another, which later also essentially corresponds to the operating phase of the extinguishing arrangement.

The clamp is typically (not shown here) placed around the outer circumference of the tubular extinguishing section of the extinguishing lance or the area of the holding section with the handle part of the extinguishing lance. The opposite ends 32a', 32a" and 32b', 32b" of the C-shaped halves are then brought closer together via a clamping device 33a, 33b . As a result, the clamp is pulled together and the tubular extinguishing section clamped.

In the form shown here, the clamping devices 33a, 33b comprise a hinge 34a, by which the ends 32a' and 32a" are firmly connected to one another and at the ends 32b' and 32b" there is an internal thread for a clamping screw 34b, by means of which the clamping device 33a, 33b can then be tightened. Furthermore, the halves 32', 32" each comprise an internal thread in which the tubular holding part of the position holder can be fastened.

The clamping screw 34b is secured against loss (especially in confusing and hectic situations) and the ends 32b' and 32b" are additionally secured against falling apart by means of a safety chain 34c. The safety chain 34c is connected to the clamping screw 34b and the end 32b". For this purpose, metal rings can be attached to the clamping screw 34b and in the area of the end 32b", which have eyelets into which the safety chain 34c can be hung. The length of the safety chain 34c can be selected so that the clamping screw 34b connected to it is as long as possible is close to the internal thread provided for the clamping screw 34b and the clamping screw 34b can be easily inserted into the internal thread.Typically, the safety chain 34c can have a length between 50 and 100 mm.The safety chain 34c can also be easily implemented and operated intuitively.

the figure 5 shows the individual parts of the clamping screw 34b in a schematic side view, as they appear in the mechanical coupling device Figure 4a can be used. The clamping screw 34b consists of a threaded bushing 34b' with an internal thread, a threaded bolt 34b", a threaded pin 34b‴ and a screw handle which acts as a star handle 34bʺʺ is formed and has an internal thread below the handle area. The clamping screw 34b is specially made for the clamping device Figure 4a suitable because operation is easy and intuitive and the individual, interconnected components are not easily lost.

Reference list:

10

extinguishing lance

11

handle part

11', 11"

bow handles

11a

stress insulating coating

12

docking device

13

tubular extinguishing section

13a

stress insulating coating

14

batting section

14'

striking plate

15

Top

30

position holder

30a

stress insulating coating

31

tubular holding part

32

mechanical coupling device

32', 32"

halves

32a', 32b'

ends (of the first half)

32a", 32b"

ends (of the second half)

33a, 33b

clamping device

34a

hinge

34b

clamping screw

34b′

threaded bush

34bʺ

threaded bolt

34b‴

grub screw

34bʺʺ

cross handle

34c

safety chain

35

base part

35'

extension piece

a

Longitudinal axis (of the tubular holding part)

e.g

Longitudinal axis (of the tubular extinguishing section)

Reference list:

1. [1] DE 20 2020 102 574 U1
2. [2] DE 20 2017 104 411 U1 ≈ WO 2019/020507 A1
3. [3] https://www.welt.de/motor/news/article120704501/E-Mobil-Brand-in-den-USA.html
4. [4] US-A 4,802,535
5. [5] US 2003/0159837 A1
6. [6] US 2002/019307 A1
7. [7] "MOBILES LEBEN - WAS, WENN ES BRENNT?" aus der Illustrierten "stern" vom 19.06.2019, S.80
8. [8] DE 10 2016 211 854 B3 ≈ EP 3 263 402 B1
9. [9] "ELEKTRISIERENDER EINSATZ" aus der Feuerwehr-Fachzeitschrift "BRANDHEISS" in der Ausgabe Juli-August 2018, S.16
10. [10] Artikel in der digitalen Ausgabe der Süddeutschen Zeitung "Der Fahrersitz war leer" vom 19. April 2021, abgerufen am 20.04.2021 https://www.sueddeutsche.de/wirtschaft/tesla-texas-unfall-1.5269139
11. [11] CN 106 492 384 A
12. [12] DE 10 2018 222 429 A1

Documents considered for the assessment of patentability

1. [1] DE 20 2020 102 574 U1
2. [2] DE 20 2017 104 411 U1 ≈ WO 2019/020507 A1
3. [3] https://www.welt.de/motor/news/article120704501/E-Mobil-Brand-in-den-USA.html
4. [4] US-A 4,802,535
5. [5] US 2003/0159837 A1
6. [6] U.S. 2002/019307 A1
7. [7] "MOBILE LIFE - WHAT IF IT FIRE?" from the magazine "stern" from June 19th, 2019, p.80
8. [8th] DE 10 2016 211 854 B3 ≈ EP 3 263 402 B1
9. [9] "ELECTRICAL USE" from the fire service journal "BRANDHEISS" in the July-August 2018 issue, p.16
10. [10] Article in the digital edition of the Süddeutsche Zeitung "The driver's seat was empty" from April 19, 2021, retrieved on April 20, 2021 https://www.sueddeutsche.de/wirtschaft/tesla-texas-unfall-1.5269139
11. [11] CN 106 492 384 A
12. [12] DE 10 2018 222 429 A1

Claims (15)

Extinguishing arrangement with an extinguishing lance (10) for extinguishing burning electrical equipment, such as vehicles equipped with an electric motor, the extinguishing lance (10) having a holding section with a grip part (11) for an operator, an extinguishing agent feed with a coupling device (12) for connecting a pressure hose for liquid extinguishing agent, as well as a tubular extinguishing section (13) with a longitudinal axis (z) adjoining the holding section and optionally the coupling device (12), from the free end of which extinguishing agent can be introduced under pressure into a burning object, the handle part (11 ) and the tubular quenching section (13) have a voltage-isolating coating (11a; 13a) at least in the area of the holding section, which is also designed to be electrically insulating for electrical voltages U ≥ 500V, the tubular quenching section (13) being made of one material , which has such a high tensile strength R _m that it is a mechanical hen stress σ ≥ 500 N/mm ² and which has a melting temperature t _S ≥ 650°C, the tubular extinguishing section (13) tapering to a point at its free end opposite the holding section and having a narrowed clear flow cross-section for the extinguishing means passed through under pressure, wherein the tubular extinguishing section (13) and also the pointed free end of the tubular extinguishing section (13) are made of stainless steel, and the pointed free end of the tubular extinguishing section (13) is additionally hardened,
characterized,
that the extinguishing arrangement comprises a position holder (30) which is designed in such a way that the extinguishing lance (10) can be held in a geometric position during an operating phase during an extinguishing operation by an assistant who is at a lateral distance from the extinguishing lance (10), in which the longitudinal axis (z) of the tubular extinguishing section (13) is aligned at an angle of between 60° and 90° to the earth's surface, while an extinguisher operates the extinguishing lance (10) in the extinguishing operation. Extinguishing arrangement according to Claim 1, characterized in that the position holder (30) has a tubular holding part (31) with a longitudinal axis (a) which, during operation, projects laterally away from the extinguishing lance (10), preferably approximately at right angles to the longitudinal axis (z) of the tubular extinguishing section (13). Extinguishing arrangement according to Claim 1 or 2, characterized in that the position holder (30) is permanently attached to the extinguishing lance (10). Extinguishing arrangement according to Claim 1 or 2, characterized in that the position holder (30) is detachably fastened to the extinguishing lance (10) during an operating phase. Extinguishing arrangement according to one of Claims 2 to 4, characterized in that the tubular holding part (31) of the position holder (30) has a voltage-insulating coating (30a) which is designed to be electrically insulating for electrical voltages U ≥ 500V. Extinguishing arrangement according to Claim 5, characterized in that the stress-insulating coating (30a) of the tubular holding part (31) has a layer thickness d ≥ 2mm, in particular between 2mm and 5mm, and is designed to be electrically insulating for electrical voltages U to 1000V and above. Extinguishing arrangement according to one of Claims 2 to 6, characterized in that the tubular holding part (31) of the position holder (30) is made of aluminum, in particular of an Al alloy, preferably of AlCuMgPb about 30 mm thick, and the stress-isolating coating (30a) of the tubular Holding part (31) are constructed of polyvinyl chloride. Extinguishing arrangement according to one of claims 4 to 7, characterized in that the tubular holding part (31) of the position holder (30) by means of a mechanical coupling device (32), in particular a clamp, a clamp, a fork or a pair of pliers, which can be mechanically coupled to the extinguishing lance (10) in a reversible manner. Extinguishing arrangement according to Claim 8, characterized in that the mechanical coupling device (32) is rigidly attached to the tubular holding part (31) of the position holder (30). Extinguishing arrangement according to Claim 8 or 9, characterized in that the mechanical coupling device (32) has a two-part clamp, the two halves (32', 32") of which are each constructed in a C-shape and the two ends (32a', 32b') of which ; 32a", 32b") are opposite each other in an operating phase of the extinguishing arrangement, the clamp being placed around the outer circumference of the tubular extinguishing section (13), preferably in the area of the holding section with the handle part (11), and the two opposite ends (32a ' and 32a" or 32b' and 32b") of the C-shaped halves (32', 32") are each brought closer together by means of a clamping device (33a; 33b), so that the clamp is pulled together around the tubular extinguishing section (13). is clamped and spanned. Extinguishing arrangement according to Claim 10, characterized in that the clamping devices (33a; 33b) comprise a hinge (34a) and/or a clamping screw (34b). Extinguishing arrangement according to Claim 11, characterized in that the clamping screw (34b) has a threaded bush (34b'), a threaded bolt (34b"), a threaded pin (34b‴) and a screw handle, in particular a star handle (34b""). Extinguishing arrangement according to one of the preceding claims, characterized in that the tubular holding part (31) is designed to be extendable with respect to its longitudinal axis (a). Extinguishing arrangement according to Claim 13, characterized in that the tubular holding part (31) can be pulled apart or compressed in a telescopic manner. Extinguishing arrangement according to Claim 13, characterized in that the tubular holding part (31) has a base part (35) and one or more extension pieces (35') which can be connected to the base part (35) in the direction of the longitudinal axis (a), preferably with this and, if necessary, can be screwed together.

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