EP1803488A1 - Fire fighting device with tank and corresponding pressurized gas bottle - Google Patents

Abstract

A device has an extinguishing material container (10) with a container casing (12) closed on both sides and a piston (20) axially movable in the casing that divides an extinguishing material chamber (22) from a propellant chamber (24). It has a pressurized gas chamber (26) within the extinguishing agent container and spatially separate from the propellant chamber for controlled application of pressure to the propellant chamber, whereby the piston is able to move along the pressurized gas chamber.

Description

Technical area

The present invention relates to a fire extinguishing device with an extinguishing agent container and a compressed gas cylinder which is particularly suitable for use together with this extinguishing agent container.

State of the art

A variety of different types of fire extinguishers or fire extinguishers with extinguishing agent containers are known. In principle, a distinction can be made between portable fire extinguishers and stationary or mobile fire extinguishing devices. The former are particularly suitable for manual use, whereas the latter are often used in automatic fire extinguishing systems or car use.

Many fire extinguishers, especially portable, have the disadvantage that they can not be used reliably in any spatial orientation. Namely, the extinguishing agent can not be completely applied in every orientation.

This problem can be avoided if a solid piston or flexible membrane is movably disposed in the extinguishant canister and separates an extinguishant space from a propellant space. Such extinguishing agent containers are known in particular in connection with automatic fire extinguishing systems. These have over the fire extinguishers described above in particular the advantage that a complete expulsion of the extinguishing agent is ensured even with any spatial orientation of the extinguishing agent container. They are therefore already used in permanently installed in vehicles, automatic fire extinguishing systems, where it can come to an arbitrary orientation of the extinguishing agent container by an accident.

An extinguishing agent container with piston is in the WO 96/36398 described. This is particularly suitable for closed rooms, such as passenger compartments or engine compartments, and includes an extinguishing agent container with a cylindrical, sealed on both sides of the container casing and a piston axially displaceable in the container jacket. The piston, in the extinguishing agent container, separates an extinguishing agent space containing an extinguishing agent from a propellant space containing a pressurized propellant gas. The extinguishing agent space is provided at an exit for the extinguishing agent with a trigger valve. Upon actuation of the trigger valve, the propellant gas, by displacement of the piston into the extinguishing agent space inside, drive the extinguishing agent from the extinguishing agent container.

A fire extinguishing device with an extinguishing agent container according to WO 96/36398 However, in particular has the disadvantage that the extinguishing agent pressure during the discharge of the extinguishing agent is not constant. To ensure complete discharge, a considerable expansion of the volume of propellant gas is required. This brings during the expulsion of the extinguishing agent (at unchanged temperature), however, a strong pressure drop of the propellant gas and consequently also the extinguishing agent with it. As a result, the throughput of extinguishing agent falls over the deletion. Furthermore, as extraction progresses, the matching of extinguishant pressure to commonly connected atomizer nozzles for the extinguishant of such equipment degrades.

The US 4,889,189 describes the construction of an extinguishing agent container with an inner, expandable membrane which separates the extinguishing agent space from the propellant space. Furthermore, a method for selecting an optimal amount of extinguishing agent and a most suitable propellant pressure will be described. The construction as well as the method according to the US 4,889,189 Among other things, they aim to reduce the above negative pressure drop. However, the dropping of the extinguishing agent pressure and the extinguishing agent flow rate during the erasing operation can not be satisfactorily prevented either with this extinguishing agent container or with this method.

Another design-related problem of known extinguisher containers with pistons or diaphragms is caused by the fact that both propellants and extinguishing agents are permanently under nominal pressure over the life of the fire extinguisher. (usually of the order of 100 bars or more). This increases the risk of leakage of both means, whereby the reliability of the fire extinguishing device is reduced. Furthermore, there are relatively strict requirements for the design of the extinguishing agent container and the connected fittings.

Object of the invention

Object of the present invention is therefore to propose a fire extinguishing device which is functional in any spatial orientation and ensures increased reliability.

General description of the invention

This object is achieved by a fire extinguishing device comprising an extinguishing agent container with a sealed on both sides of the container casing and an axially displaceable in the container casing piston which separates an extinguishing agent space in the extinguishing agent from a propellant space. According to the invention, an internal and separate from the propellant space pressure gas chamber for controlled pressurization of the propellant space is provided in the extinguishing agent container. Here, the piston is slidably disposed along the pressure gas chamber.

The inventive, integrated in the container pressure gas chamber is independent of the propellant space, and thus also of the variable volume of the latter. This makes it possible on the one hand avoid suitable switching means that the propellant space and the extinguishing agent are at rest under operating pressure, on the other hand allows this arrangement, using suitable pressure control means, a controlled pressurization of the propellant space, in particular with constant pressure over the entire duration of Löschmittelaustrags. The propellant pressure in the pressure medium chamber and consequently also the extinguishing agent pressure in the construction according to the invention is not only constant over the duration of the extinguishing agent discharge but in the absolute value freely selectable and thus adaptable for various applications. Furthermore, a compact, space-saving design of the fire extinguishing device is achieved, which unites extinguishing agent tank and pressure medium source in one unit. As a result, this fire-extinguishing device is of particular interest for use in goods and passenger transport vehicles. A line overhead as it arises when using separate, external pressure vessels as a pressure medium source largely eliminated, resulting in addition to cost reduction, an increase in safety and reliability.

In a structurally advantageous construction of the container shell is cylindrical and the pressure gas chamber is arranged in the extinguishing agent container coaxial with the container shell. An annular piston suitable for coaxial pressure gas chamber has e.g. a circular cylindrical outer shape and is provided with a coaxial circular cylindrical guide opening.

In a first possible embodiment, an internal combustion gas cylinder in the compressed gas cylinder is provided with at least partially cylindrical outer wall. Here, the piston is designed as an annular piston and slidably guided along the cylindrical part of the outer wall of the compressed gas cylinder. In this embodiment, the pressure gas chamber is formed by a, preferably specially processed, compressed gas cylinder so that the piston on the bottle itself can be slidably mounted, whereby an additional guide is saved.

In a second possible embodiment, the fire-extinguishing device comprises a cylindrical guide casing which is located inside the extinguishing agent container and a compressed gas cylinder which is arranged inside the cylindrical guide casing. Here, the piston is configured as an annular piston and guided displaceably along the cylindrical guide shell. The essential difference from the first embodiment is that a conventional compressed gas cylinder used to provide the pressure gas chamber and in the Extinguishing agent can be integrated. However, this requires the use of a separate guide for the piston.

It is further preferably provided a switching valve for controlled pressurization of the propellant space, which is connected on the input side to the compressed gas chamber and the output side to the propellant space to feed the propellant space by opening the switching valve with compressed gas. With the switching valve, the fire extinguishing device advantageously further comprises a pressure control valve for controlled pressurization of the propellant space, which is connected to the input or the output of the switching valve to act on the propellant space with compressed gas at a predetermined, substantially constant pressure during the deletion process. To control the switching valve is provided in a preferred embodiment, that the switching valve has at least one pneumatic control port, and a temperature-sensitive, pressure-loaded detector line is present, which is connected to the pneumatic control port of the switching valve to open the pressure drop in the detector line, the switching valve. As a result, an automatic release of the fire extinguishing device is possible in a simple and reliable way if necessary.

In one possible embodiment, the fire extinguishing device comprises a switching valve having a first and a second pneumatic control connection, a first pressure control valve, and a connection for a detector line, wherein the first pressure control valve is connected directly to the input side of the pressure gas chamber and the output side to the input of the switching valve, wherein the Connection for the detector line to the first control port and the output of the first pressure control valve is additionally connected to the second control port, and wherein the switching valve is connected on the output side to the propellant space. This embodiment is particularly suitable for expelling extinguishing agent at an average pressure which coincides with that in the detector line.

In a further possible embodiment, the fire extinguishing device comprises in addition, a second pressure control valve which is connected on the input side to the output of the first pressure control valve and the output side at the input of the switching valve or input side at the output of the switching valve and the output side of the propellant space. This embodiment is particularly suitable for expelling extinguishing agent at a low pressure, which is lower than that in the detector line.

In another possible embodiment, the fire extinguishing device additionally comprises a second pressure regulating valve which is connected on the input side to the first control connection and on the output side to the connection for the detector line. This embodiment is particularly suitable for expelling extinguishing agent at a high pressure, which is greater than that in the detector line.

Preferably, the fire extinguishing device further comprises a compensation line for compensating leaks in the detector line, which is connected to the output of the first pressure regulating valve and connected to the terminal for the detector line, wherein in the compensation line a check valve is arranged, which at excessive pressure loss in the detector line an excessive Loss of propellant over the compensation line prevented.

Preferably, the fire extinguishing device further comprises a creeping gas safety device, which is connected to the output of the switching valve in order to prevent a creeping pressure build-up in the propellant space.

In a particularly compact and robust design, the fire extinguishing device further comprises a compressed gas cylinder inside the extinguishing agent container, the compressed gas cylinder comprising the pressure chamber and having a thickened bottle bottom, which receives at least the switching valve, the first pressure control valve and possibly the second pressure control valve as a valve block. It is advantageous if the connecting line, which leads via the switching valve, the first pressure control valve and optionally the second pressure control valve from the pressure chamber to the propellant space is formed by holes in the dashboard. In this Construction makes the fire extinguisher even more compact, leak-proof, and more robust.

When using a pressure cylinder inside the extinguishing agent, a dimensioning in which the compressed gas cylinder occupies 10% to 35% of the effective volume of the extinguishing agent container, has proved to be preferred.

In order to accommodate the largest possible extinguishing agent volume in the container, it is advantageous if the piston comprises an inner guide bushing for guiding the cylindrical part of the compressed gas cylinder or on the guide casing and an outer guide shirt for guiding the container casing and wherein the guide bushing has a smaller axial extent than the guide shirt. As a result, the piston can be acted upon in the stop from the center of the vessel with propellant.

The piston is preferably guided on the basis of a, corresponding to the cross section of the pressure gas chamber recess at this, so that it surrounds the pressure gas chamber. It is also possible to arrange pistons and pressure gas chamber with complementary cross sections in the container casing so that the piston does not surround the pressure gas chamber.

Independently of the fire-extinguishing device, the present invention also relates to a specially developed compressed-gas cylinder and in particular to its production method. Without being limited to this application, the use of such a special compressed gas cylinder in the fire extinguishing device according to the invention is particularly advantageous.

• ■ Rückwärtsfließpressen eines Rohteils zu einem Formling, welcher einen Flaschenboden und einen zylindrischen Flaschenmantel umfasst, wobei der Flaschenmantel einseitig vom Flaschenboden abgeschlossen ist;
• ■ Verarbeiten des Formlings zu einem Druckgasflaschen-Rohling durch Umformen des zylindrischen Flaschenmantels zu einem Flaschenhals im Endbereich welcher dem Flaschenboden gegenüberliegt;
• ■ Verarbeiten des Druckgasflaschen-Rohlings zu einer Druckgasflasche.
  Erfindungsgemäß ist das Herstellungsverfahren dadurch gekennzeichnet, dass
• ■ das Rückwärtsfließpressen derart ausgeführt wird, dass der Flaschenboden als massive, verdickte Bodenplatte ausgestaltet ist und
• ■ das Verarbeiten des Druckgasflaschen-Rohlings zu einer Druckgasflasche zumindest das Anfertigen einer Aufnahmebohrung für ein Ventil in der massiven, verdickte Bodenplatte umfasst.

An inventive production method for such a compressed gas cylinder, comprises the following steps:

• ■ backward extrusion of a blank to a blank, which comprises a bottle bottom and a cylindrical bottle jacket, wherein the bottle jacket is closed on one side of the bottle bottom;
• ■ processing of the molded article to a compressed gas cylinder blank by forming the cylindrical bottle jacket to a bottle neck in the end region which is opposite to the bottom of the bottle;
• ■ Processing the compressed gas cylinder blank into a compressed gas cylinder.
  According to the invention, the production method is characterized in that
• ■ the Rückwärtsfließpressen is carried out such that the bottle bottom is designed as a solid, thickened bottom plate and
• ■ the processing of the compressed gas cylinder blank to a compressed gas cylinder comprises at least making a receiving bore for a valve in the solid, thickened bottom plate.

Preferably, in the method, the solid, thickened bottom plate is designed as a cylindrical solid body, which has the same radius as the cylindrical bottle jacket after the backward extrusion.

Herein, the processing of the compressed gas cylinder blank to a compressed gas cylinder, preferably the making at least one housing and valve seat bore as a receiving bore for a valve.

To connect the valve or valves to be integrated in the bottom of the bottle, the processing of the compressed gas cylinder blank to a compressed gas cylinder advantageously comprises making at least one connecting bore from the receiving bore to the interior of the compressed gas cylinder and at least one outlet bore from the receiving bore to the outside in the thickened, solid bottom plate.

In order to enable a complete installation of the necessary fittings, in the process the Rückwärtsfließpressen is advantageously carried out such that the bottom plate has an extension in the longitudinal direction of the compressed gas cylinder, which is 5 to 15 times the wall thickness of the bottle jacket or at least 50mm.

• ■ Anfertigen mehrerer Gehäuse- und Ventilsitzbohrung, mindestens einer Verbindungsbohrung von einer ersten Gehäuse- und Ventilsitzbohrung zum Innenraum der Druckgasflasche und mindestens einer Verbindungsbohrung von einer weiteren Gehäuse- und Ventilsitzbohrung nach Außen, wobei sämtliche Gehäuse- und Ventilsitzbohrungen in der verdickten, massiven Bodenplatte angeordnet sind; und
• ■ Anfertigen von mindestens einer Verbindungsbohrung zwischen der ersten Gehäuse- und Ventilsitzbohrung und einer weiteren Gehäuse- und Ventilsitzbohrung, wobei die Verbindungsbohrung in der verdickten, massiven Bodenplatte schräg bezüglich der Längsachse der Druckgasflasche verläuft.

In particular for the production of a compressed gas cylinder for more complex applications, the processing of the compressed gas cylinder blank into a compressed gas cylinder further preferably comprises the following steps:

• ■ making a plurality of housing and valve seat bores, at least one communication bore from a first housing and valve seat bore to the interior of the pressurized gas cylinder and at least one communication bore from a further housing and valve seat bore to the outside, wherein all the housing and valve seat bores are arranged in the thickened, solid bottom plate; and
• ■ making at least one communication bore between the first housing and valve seat bore and another housing and valve seat bore, the communication bore in the thickened, solid bottom plate extending obliquely relative to the longitudinal axis of the pressurized gas cylinder.

As a result, all the required processing steps of the valve block can be carried out from the front side of the bottle bottom. A spanning of the workpiece is unnecessary. It is possible in a simple way, the integration of the connecting lines between the fittings in the designed as a dashboard bottle bottom.

In intended utilization of the compressed gas cylinder as a guide for a piston in an extinguishing agent container according to the invention, the processing of the compressed gas cylinder blank to a compressed gas cylinder further preferably, the machining of the outer surface of the bottle jacket as a cylindrical guide by cutting forming.

piece placement

Fig. 1:

einen Längsschnitt durch einen Löschmittelbehälter gemäss einer ersten Ausführung der Erfindung;

Fig. 2:

einen Längsschnitt durch einen Löschmittelbehälter gemäss einer zweiten Ausführung der Erfindung;

Fig. 3:

eine schematische Darstellung einer ersten Feuerlöschvorrichtung für niedrigen Löschmitteldruck mit einem erfindungsgemäßen Löschmittelbehälter;

Fig. 4:

eine schematische Darstellung einer zweiten Feuerlöschvorrichtung für mittleren Löschmitteldruck mit einem erfindungsgemäßen Löschmittelbehälter;

Fig. 5:

eine schematische Darstellung einer dritten Feuerlöschvorrichtung für hohen Löschmitteldruck mit einem erfindungsgemäßen Löschmittelbehälter;

Fig. 6:

eine Seitenansicht des Löschmittelbehälters gemäss Fig.2;

Fig. 7:

einen Teillängsschnitt des Löschmittelbehälters gemäss Schnittebene VII-VII in Fig.3;

Fig. 8:

einen Teillängsschnitt des Löschmittelbehälters gemäss Schnittebene VIII-VIII in Fig.3;

Fig. 9:

einen Teillängsschnitt des Löschmittelbehälters gemäss Schnittebene IX-IX in Fig.3;

Fig. 10:

einen Teillängsschnitt des Löschmittelbehälters gemäss Schnittebene X-X in Fig.3;

Fig. 11:

einen Teillängsschnitt des Löschmittelbehälters gemäss Schnittebene XI-XI in Fig.3;

Fig. 12:

einen Teillängsschnitt des Löschmittelbehälters gemäss Schnittebene XII-XII in Fig.3;

Fig. 13:

einen Teillängsschnitt des Löschmittelbehälters gemäss Schnittebene XIII-XIII in Fig.3;

Fig. 14:

ein Längsschnitt eines Druckgasflaschen-Rohlings zur Anwendung in einem Löschmittelbehälter gemäss Fig.2;

Fig. 15:

ein Längsschnitt eines bearbeiteten, alternativen Druckgasflaschen-Rohlings zur Anwendung in einem einen Löschmittelbehälter gemäss Fig.2;

In the following, some embodiments of the invention will now be described in more detail with reference to the accompanying Figures serving as illustration. In the figures, the same or prime reference characters are used for the same or similar components throughout. Show it:

Fig. 1:

a longitudinal section through an extinguishing agent container according to a first embodiment of the invention;

Fig. 2:

a longitudinal section through an extinguishing agent container according to a second embodiment of the invention;

3:

a schematic representation of a first fire extinguishing device for low extinguishing agent pressure with an extinguishing agent container according to the invention;

4:

a schematic representation of a second extinguisher device for medium extinguishing medium pressure with an extinguishing agent container according to the invention;

Fig. 5:

a schematic representation of a third fire extinguishing device for high extinguishing medium pressure with an extinguishing agent container according to the invention;

Fig. 6:

a side view of the extinguishing agent container according to Fig.2;

Fig. 7:

a partial longitudinal section of the extinguishing agent container according to section plane VII-VII in Figure 3;

Fig. 8:

a partial longitudinal section of the extinguishing agent container according to section plane VIII-VIII in Figure 3;

Fig. 9:

a partial longitudinal section of the extinguishing agent container according to sectional plane IX-IX in Figure 3;

Fig. 10:

a partial longitudinal section of the extinguishing agent container according to section plane XX in Figure 3;

Fig. 11:

a partial longitudinal section of the extinguishing agent container according to the sectional plane XI-XI in Figure 3;

Fig. 12:

a partial longitudinal section of the extinguishing agent container according to sectional plane XII-XII in Figure 3;

Fig. 13:

a partial longitudinal section of the extinguishing agent container according to section plane XIII-XIII in Figure 3;

Fig. 14:

a longitudinal section of a compressed gas cylinder blank for use in an extinguishing agent container according to Fig.2;

Fig. 15:

a longitudinal section of a processed, alternative compressed gas cylinder blank for use in an extinguishing agent container according to Figure 2;

Description of preferred embodiments of the invention with reference to the figures

1 shows an extinguishing agent container according to a first embodiment of the invention, which is generally designated by reference numeral 10 '. The extinguishing agent container 10 'comprises a cylindrical container casing 12', which is closed on both sides by a first closure 14 'and a second closure 16' leak-proof. The closures 14 ', 16' are screwed by means of internal threads on external thread of the container casing 12 'and sealed by means of sealing rings. A cylindrical guide casing 18 'is arranged in the extinguishing agent container 10' coaxial with the container casing 12 '. A piston 20 'surrounds the guide casing 18' and is axially displaceably mounted in the extinguishing agent container 10 'by the latter and the inner surface of the container casing 12'. The piston 20 'is designed as an annular piston with a central guide bushing. The piston 20 'separates in the extinguishing agent container 10' an extinguishing agent space 22 'of a propellant space 24'. A coaxial pressure gas chamber 26 'lying inside the extinguishing agent container is again spatially separated from the extinguishing agent space 22' and from the propellant space 24 'by a compressed gas cylinder 28' of conventional design. The compressed gas cylinder 28 'and the pressure gas chamber 26' are located within the guide casing 18 ', so that the piston 20' on the guide casing 18 'along the pressure gas chamber 26' is displaceable. Thus, at least in the displacement region of the piston 20 ', both guide casing 18', the container casing 12 'as well as the piston 20' as a cylindrical body in the geometric sense (ie not necessarily circular cylindrical) are formed.

In the embodiment according to FIG. 1, a fitting block 30 'is screwed onto the connecting thread in the bottleneck of the compressed gas cylinder 28'. The fittings in the armature block 30 '(described in detail below) serve, inter alia, the controlled pressurization of the propellant space 24' with propellant gas from the compressed gas cylinder 28 '. 1, both the guide casing 18 ', the compressed gas cylinder 28' as well as the valve block 30 ', by appropriate shaping of the closures 14', 16 'and a holder 29', securely held in the extinguishing agent container 10 'and against Damage protected arranged. By the arrangement described above, a compact, space-saving design is achieved, which requires without significant additional design volume, it makes it possible to combine a piston extinguishing agent container with a separate pressure accumulator. In fact, it should be noted that, for example, in the illustrated construction, by the Guide casing 18 'delimited internal volume, including compressed gas cylinder 28' and valve block 30 ', only about 25% of the total useful volume of the extinguishing agent container 10' makes up. The separate pressure gas chamber 26 'makes it possible to keep the volume required in the standby state for the propellant gas comparable or even lower than in prior art piston extinguishing agent containers.

By means of suitable seals, the inner volume delimited by the guide casing 18 'is sealed off from the outside and the extinguishing agent space 22'. The piston 20 'is equipped with known O-ring seals on the inner surface of the container shell 12' and on the guide casing 18 ', which in the longer term penetration of extinguishing agent in the propellant space 24' and penetration of propellant into the extinguishing agent space 22 ' reliably prevent, however, without adversely affecting the displaceability of the piston 20 '.

The operating principle of the extinguishing agent container 10 'can be summarized as follows. In operational readiness, the extinguishant space 22 'is filled with an extinguishing agent, such as water mixed with an additive. Neither the extinguishing agent space 22 'nor the propellant space 24' are under pressure, ie, the permanent extinguishing agent pressure in the standby state can be, for example, at atmospheric pressure. In fact, the propellant space 24 'is isolated from the pressurized gas bottle 28' in operative readiness by a switching valve 32 'in the fitting block 30'. If necessary, the switching valve 32 'is triggered, for example, by a detector device explained below, so that only when triggered, the propellant gas from the pressure gas chamber 26' in the propellant space 24 'flows. The propellant gas is preferably down regulated by a pressure control valve or a pressure reducer in the valve block 30 '(not shown in Figure 1) to a predetermined extinguishing pressure, eg 4bar, 15bar or 90bar. Under the action of the propellant gas, the piston 20 'is displaced in the direction of the arrow 34' into the original extinguishing agent space 22 'at a constant extinguishing pressure. Upon reaching a predetermined pressure, the extinguishing agent is driven by a space membrane or a pressure relief valve 36 'from the extinguishing agent container 10' and passed in a known manner by means of connection 38 'to the point to be extinguished. Hereby moves the piston, via the guide casing 18 ', along the pressure gas chamber 26' of closure 16 '(as in Figure 1) to the closure 14' out (not shown) and reaches the latter when the extinguishing agent is completely discharged. Of course, the compressed gas cylinder 28 'is filled with propellant gas under adequately dimensioned accumulator pressure, so that even with smaller leaks a complete expulsion of the entire extinguishing agent is made possible.

2 shows in longitudinal cross section an extinguishing agent container 10 according to a second, further developed embodiment of the invention. Similar to the first embodiment, the extinguishing agent container 10 comprises a container shell 12, which is closed on both sides by means of a first and a second closure 14, 16. A piston 20 is axially displaceable in the container casing 12, and arranged there an extinguishing agent space 22 of a propellant space 24. A in the extinguishing agent container 10 internal pressure gas chamber 26 is arranged for controlled pressurization of the propellant space 24, coaxial with the container shell 12 in the extinguishing agent container 10. The piston 20 is designed as an annular piston and slidably disposed along the pressure gas chamber 26. As can be seen from FIG. 2, in contrast to the first embodiment, the pressure gas chamber 26 is not spatially separated from the extinguishing agent space 22 and the propellant space 24 by means of an additional guide casing, but is formed integrally and exclusively by a novel, cylindrical compressed gas cylinder 28. Furthermore, the embodiment differs according to Fig.2, characterized in that in the novel compressed gas cylinder 28, more precisely in its massive, thickened compared to conventional gas cylinders, bottle bottom housing and valve seats for almost all fittings required are incorporated as holes. In other words, the bottle bottom of the compressed gas cylinder 28 itself forms a valve block 30, so that several valves, space-saving and protected against damage, can be accommodated in the bottom of the compressed gas cylinder 28. Said fittings are explained in detail below.

It is apparent from Fig.2 that the piston 20 is mounted axially displaceable directly on the outer surface of the compressed gas cylinder 28 according to arrows 34. It may be advantageous in this case that this outer surface fits exactly is processed, but this is not absolutely necessary with a sufficiently small manufacturing tolerance. It can also be seen from FIG. 2 that the piston 20 comprises an inner guide bush 40 for guiding on the pressure gas chamber 26, ie the compressed gas cylinder 28, and an outer guide shirt 42 for guiding on the container casing 12. In this case, the guide bush 40 has a smaller axial extent than the guide shirt 42. When the piston is moved to the first closure 14, the extinguishing agent is driven via a pressure relief valve 36 (or a space membrane) from the extinguishing agent container 10. At port 38, an extinguishant line is generally connected to direct the extinguishing agent to the desired location. It can, as shown in Figure 2, a plurality of terminals 38 may be provided, for example, for feeding a plurality of extinguisher lines leading to different locations.

Before the second, further developed embodiment of the invention according to FIG. 2 is described in more detail, some variants of a fire extinguishing device according to the invention and their functions will first be explained. Both the extinguishing agent container 10 'according to the first embodiment, as well as the extinguishing agent container 10 according to the second embodiment are suitable for fire extinguishing devices described below, but it is made to simplify the second embodiment.

Fig. 3 shows a first low extinguishant pressure extinguishing device 50 (e.g., 4bar) in a simplified schematic representation. The fire extinguishing device 50 comprises the extinguishing agent container 10 with axially displaceable piston 20, which separates the extinguishing agent space 22 from the propellant space 24. According to the invention, the pressure vessel 28 with the compressed gas chamber 26 is arranged in the extinguishing agent container 10. It should be noted that for the sake of clarity, in FIGS. 3 to 5, the compressed gas chamber 26 and the compressed gas cylinder 28 are not integrated in the extinguishing agent container 10, but are shown separately. The valve block 30 connects the interior of the compressed gas cylinder 28, inter alia, with the propellant space 24 via various fittings.

Connected directly to the outlet of the compressed gas cylinder 28 is a first Pressure control valve 52, which reduces a storage pressure p1 (eg 200bar) of the propellant in the compressed gas cylinder 28 to a first intermediate pressure p2 (eg 15bar). At the output of the pressure regulating valve 52, a switching valve 32 is connected. The switching valve 32 is, for example, a 2/2-way valve with blocking in the counterflow direction, which has pneumatic control connections 56, 58. The output of the switching valve 32 is connected to a second pressure regulating valve 60, which reduces the intermediate pressure p2 to a driving pressure p3 (eg 4bar) for the propellant space 24. Alternatively, the pressure regulating valve 60 could also be arranged directly upstream of the switching valve 32. The output of the second pressure regulating valve 60 is connected via a spring-loaded pressure relief valve 62 (or a place diaphragm) with the propellant space 24 of the extinguishing agent container 10. The relief valve 62 is set to a certain minimum pressure (less than p3) which must be applied to fill the propellant space. Furthermore, the output of the switching valve 32 is guided via a creeping gas fuse 64 to the outside. The non-ideal long-term sealing of the switching valve 32 is compensated by means of a preferably equally non-ideal, or worse long-term sealing of the creeping gas fuse 64 to the outside. In this way, together with a suitable bias on the check valve 62, a creeping pressure build-up in the propellant space 24 is prevented. However, short-term pressure changes are not reduced by the creeping gas fuse 64.

Furthermore, FIG. 3 shows a spring-loaded overpressure valve 66 which is connected to the propellant space 24 and which ensures a maximum propellant pressure, with a value higher than p3, in the propellant space 24 in the case of a defect, for example on one of the pressure control valves 52, 60. As a result, possible damage, such as an explosion of the pressure medium container 10, for humans and equipment is avoided. A manual venting valve 68, simplifies the filling of the extinguishing agent container 10, more precisely the extinguishing agent space 22 with extinguishing agent by the counter pressure in the propellant space 24 can be reduced. 3 also shows the spring-loaded pressure relief valve 36 at the outlet of the extinguishing agent container 10, which can leak the extinguishing agent only when a set by bias, predetermined pressure (with a value less than p3). As a result, an unwanted escape of extinguishing agent, for example, temperature-induced change in volume, prevented. It follows from the above explanations that a design of the extinguishing agent container to a pressure which only slightly exceeds the pressure p3 is sufficient.

FIG. 3 likewise shows a ball valve 70 which is connected to the valve block 30 and which is connected on the one hand to the first control connection 56 of the switching valve 32 and additionally via a check valve 72 to the output of the first pressure control valve 52 and on the other hand to a detector line 74. In the ready state, the ball valve 70 is opened so that the detector line 70 is directly connected to the first control port 56 of the switching valve 32. Among other things, the ball valve 70 serves to replace the detector line 74 after use. The detector line 74 comprises a special hose, which is pressurized with gaseous pressure medium. This pressurized special hose is placed above a potentially fire hazard site 76. It consists of a specially developed, age-resistant and diffusion-tight polymer material and is designed so that the tube wall, for example, bursts at a temperature between 100 and 110 ° C and the gaseous pressure medium escape. Further, as shown in Fig. 3, a pressure gauge 78 for control purposes and a charge port 80 for initial pressurization are connected to the detector line 74. The check valve 72 is located in a compensation line which, by means of a small diameter line, compensates for a potential long-term pressure drop, for example by Nichtideale tightness of the ball valve 70, the filling port 80 or other microleaks, by means of propellant gas from the pressurized gas container 28. The check valve 72 in this case prevents loss of propellant via the compensation line in the event of a response of the detector line 74. The mode of action is similar to that of the creeping gas safety 64th

The operation of the fire extinguishing device 50 with the detector line 74th is briefly described below. In the ready state, the pressure in the detector line 74 is set to p 2, ie equal to the pressure at the outlet of the first pressure regulating valve 52. As soon as the pressure in the detector line 74 drops, a pressure difference arises between the control terminals 56, 58, whereby the switching valve 32 opens without external energy. Of course, a pressure drop in the detector line 74 arises when, in the event of a fire, the detector line 74 bursts at any point, in particular at the vulnerable point 76 to be protected, under the influence of heat. With open switching valve 32, the propellant space 24 is fed from the compressed gas cylinder 28 via both pressure control valves 52, 60 with propellant at constant pressure p3. As a result, the piston 20 is moved against the extinguishing agent space 24, so that the latter is continuously reduced, and the extinguishing agent is driven via the pressure relief valve 36 from the extinguishing agent container 10. It will be noted that, due to the described arrangement, the extinguishing agent will be expelled throughout the duration of discharge at constant rate and pressure p3. About an extinguishing agent line 82, the extinguishing agent is passed to atomizing nozzles 84 of known type, to which the pressure p3 of the extinguishing agent over the entire extinguishing process is optimally tuned. About the atomizer nozzles 84, the extinguishing agent is applied to the vulnerable point, which combats the fire.

4 shows a simplified, schematic representation of a fire extinguishing device 50 "according to a second variant for medium extinguishant pressure (eg 15 bar). The design of the second fire extinguishing device 50" essentially corresponds to that of the first fire extinguishing device 50. The fire extinguishing device 50 "differs only in that As a result, the extinguishing agent pressure during extinguishing corresponds to the pressure p2 (eg 15 bar) at the outlet of the first pressure control valve 52 and in the detector line 74. This variant with single-stage pressure reduction is therefore suitable, for example, for extinguishing agents and in particular for extinguishing agent nozzles 80. which are to be used at medium pressure p2, apart from the different extinguishing pressure and the correspondingly modified valve block 30 ", functioning and construction of the fire extinguishing device 50 "substantially correspond to the above explained, will be omitted here a repetition.

5 shows a simplified, schematic representation of a fire extinguishing device 50 '' according to a third variant for high extinguishing agent pressure (eg 90bar.) In contrast to the first and second variant, in the third variant, a second pressure regulating valve 60 '' 'between the ball valve 70 and the check valve 72, before the tap for the first control terminal 56, respectively. This makes it possible to select the pressure p2 at the outlet of the first pressure regulating valve 52 substantially higher (eg 90 bar) while maintaining a mean pressure p4 (eg 15 bar) in the detector line 72 with reference to the second pressure regulating valve 60 "' This variant is therefore particularly suitable for extinguishing agents and extinguishing agent nozzles which are to be used at a relatively high pressure p 2. Since the mode of operation and construction otherwise correspond to those described above, unnecessary repetition will also be required here waived.

The structure of the extinguishing agent container 10 and in particular of the compressed gas cylinder 28 and its integrated valve block 30 will be explained in more detail below with reference to FIG. 2 and FIGS. 6-15. It should be noted that extinguishing agent canister 10 and valve block 30 in these figures correspond in structure to the schematic illustration of Figure 3, that is, the first fire extinguishing device 50 for relatively low extinguishing pressure (e.g., 4 bar). However, those skilled in the art will readily be able to make the necessary adjustments according to the second and third variants for medium or high extinguishing pressure.

2 shows in cross section the first pressure control valve 52, which is arranged as a first pressure reducing stage with a correspondingly shaped, multi-stage housing and valve seat bore 89 in the thickened bottom of the compressed gas cylinder 28. 2 also shows a rupture disk device 88, which ensures the maximum internal pressure of the compressed gas cylinder 28 in order to avoid an explosion due to excessive heating, for example in case of fire. For Both fittings serve the thickened bottom plate, which forms the main body of the valve block 30, as a housing and for the pressure control valve 52 as a valve seat. From Fig.2 it can be seen that the pressure control valve 52 is connected via a connecting hole 91 directly to the interior of the compressed gas cylinder 28. The rupture disc device 88 also includes a multi-stage bore and is connected by means of a connecting bore 93 with the interior. In the bottleneck of the compressed gas cylinder 28, a filling or test port 86 is provided, via which the compressed gas cylinder 28 can be refilled or checked.

6 shows the extinguishing agent container 10 in side view from the side of the second closure 16. In addition to the various sectional planes of Figures 2 and 7-13, Figure 6 shows the externally accessible fittings in the valve block 30, namely first and second pressure control valve 52, 60; Creeping gas fuse 64; Ball valve 70; Rupture disc device 88; and a high pressure gauge 94 for inspecting the internal pressure of the pressure fals 28.

7 shows the extinguishing agent container 10 in partial longitudinal section in the region of the valve block 30. The switching valve 32 is arranged with a corresponding multi-stage housing and valve seat bore 95 in the valve block 30. The switching valve 32 comprises an inner, axially displaceable control piston 96 which is held in position by means of the control terminals 56, 58 (58 is shown in Fig. 9). At the first control connection 56, the ball valve 70 is connected to a connection nipple for the detector line. From Fig.7 also the preferred embodiment of the check valve 72 can be seen. The check valve 72 is housed as a blocking element for and together with a central, multi-stage through-bore (see Fig.10) in the control piston 96. 7 further shows the second pressure control valve 60 and its housing and valve seat bore 97 in the valve block 30. The connection between the output of the switching valve 32 and the second pressure control valve 60 is ensured by a connecting hole 99, which is inclined with respect to the longitudinal axis of the compressed gas cylinder 28.

Fig. 8 shows next to another view of the switching valve 32 and the rupture disc device 88, the pressure relief valve 66 and the vent valve 68, which are screwed in the second closure and connected directly to the propellant space 24.

9 shows a further view of the switching valve 32 and the first pressure regulating valve 52. FIG. 9 shows, in particular, the connection between the outlet of the first pressure regulating valve 52 and the inlet of the switching valve 32, which is secured by a corresponding connecting bore 101 in the thickened bottle bottom, the latter with respect to the longitudinal axis of the compressed gas cylinder 28 extends obliquely. As can be seen from FIG. 9, the input of the switching valve 32 coincides with the control connection 58. 9 also shows a valve insert 98, which forms the first pressure regulating valve 52 together with the housing and valve seat bore 89.

From Fig.10, the operation and structure of the switching valve 32 are shown in more detail. The control piston 96 is axially displaceably guided in a precisely fitting axial blind hole 103 in a valve insert 104 of the switching valve 32. A transverse bore 105 in the valve insert 104 forms the switchable connection between the input and the output of the switching valve 32. The rest and initial position of the control piston 96 is set to "closed", ie in abutment at the closed end of the blind bore 103. This will be based on appropriately selected Pressure cross-sections on the control piston 96 of the control valve 32 achieved. If a positive pressure difference arises between the first control connection 56 and the second control connection 58, ie the pressure at the control connection 56 is lower than at the control connection 58, then the control piston 96 is shifted into the "open" position toward the first control connection 56. Characterized a passage from the input of the control valve 32 (which coincides with the second control port) via the transverse bore 105 to the output of the control valve, ie the second pressure control valve 60 is released. 10 likewise shows the creeping gas safety device 64, which discharges to the outside via an obliquely situated connecting bore 107, which builds up creepingly. The creeping gas safety 64 is formed according to Fig.10 as a correspondingly designed check valve.

11 shows the second pressure control valve 60 and the high pressure gauge 94 in longitudinal cross section. In addition to the housing and valve seat bore 97 for the second pressure control valve 60, Figure 11 shows in the valve block 30 a multi-stage receiving bore 109 for the high pressure gauge 94. The receiving bore 109 opens axially into a connecting hole 111 which connects the high pressure gauge 94 with the interior of the compressed gas cylinder 28. FIG. 11 furthermore shows a valve insert 102, which together with the housing and valve seat bore 97 forms the second pressure regulating valve 60.

12 and 13 show further cross-sections of the fitting block 30 in the bottom of the compressed gas cylinder 28. An outlet bore 113 connects the second pressure control valve 60 to the outside to allow a pressure reduction, as shown in Fig.12. By venting the spring chamber of the pressure regulating valve 60 to the atmosphere, the outlet bore 113 ensures a pressure difference on both sides of the valve piston. From FIG. 13, the second pressure control valve 60, the creeping gas safety device 64 and the bursting disk device 88 can be seen again. In particular, in FIG. 13, an outlet bore 115, which is guided transversely to the longitudinal axis of the compressed gas cylinder 28, is shown in the instrument cluster 30. The outlet bore 115 opens on the one hand into the outlet of the second pressure control valve 60 and on the other hand into the propellant space 24 and forms the outlet opening of the compressed gas cylinder 28, i. the pressure gas chamber 26 for controlled pressurization of the propellant space 24. Due to the above-mentioned, shorter axial extent of the guide bush 40 of the piston 20, the mouth of the outlet bore 115 is always exposed in the propellant space 24.

FIG. 13 also shows the receiving bores 117, 119 for creeping gas safety device 64 and for the bursting disk device 88.

• • Bereitstellen eines Rohteils, das bezüglich Material (vorzugsweise Aluminium) und Form (vorzugsweise die eines kreiszylindrischen Vollkörpers) für ein Umformverfahren mittels Rückwärtsfließpressen, geeignet ist;
• • Rückwärtsfließpressen des Rohteils mittels entsprechenden Werkzeugen zu einem Formling, derart dass ein vom Rohteil verbleibender Anteil einen Flaschenboden ausbildet, und durch das Rückwärtsfließpressen ein zylindrischer Flaschenmantel gebildet wird, welcher einseitig durch den Flaschenboden abgeschlossen ist;
• • Erzeugung eines Druckgasflaschen-Rohlings 200 durch Umformen des Formlings, genauer des zylindrischen Flaschenmantels 204 zu einem Flaschenhals 206 im Endbereich, welcher dem Flaschenboden 202 gegenüberliegt;
• • Verarbeiten des Druckgasflaschen-Rohlings 200 zu einer Druckgasflasche.

The production of the novel compressed gas cylinder 28 according to FIG. 2 is explained below with reference to FIG. 14 and FIG. A manufacturing method for such a compressed gas cylinder 28 comprises the following steps:

• Providing a blank suitable for material (preferably aluminum) and mold (preferably that of a solid cylindrical body) for a reverse extrusion molding process is;
• • backward extrusion of the blank by means of appropriate tools to a molding, such that a portion remaining from the blank forms a bottle bottom, and the Rückwärtsfließpressen a cylindrical bottle jacket is formed, which is closed on one side by the bottom of the bottle;
• • Production of a compressed gas cylinder blank 200 by forming the molding, more precisely the cylindrical bottle jacket 204 to a bottle neck 206 in the end region, which is opposite to the bottle bottom 202;
• • Processing the compressed gas cylinder blank 200 to a compressed gas cylinder.

The method is characterized in that, on the one hand, the backward extrusion is carried out such that the bottom of the bottle as a massive, thickened bottom plate 202, i. as a solid body, is configured and on the other hand, the processing of the compressed gas cylinder blank 200 to a compressed gas cylinder comprises at least making a receiving bore for a valve in the solid, thickened bottom plate 202.

14 shows a possible compressed gas cylinder blank 200 produced in this method with a solid, thickened base plate 202 as bottle bottom, a bottle jacket 204 connected thereto and a bottle neck 206. Before further processing, the solid, thickened base plate 202 forms a cylindrical solid body with the same Radius as the bottle jacket 204. The numbers used in the following in parenthesis refer to examples of Figures 2 and 6 to 13.

The preparation of a receiving bore for a valve when processing the compressed gas cylinder blank 200 to a compressed gas cylinder 28 comprises, for example, at least one housing and valve seat bore (89, 95, 97), and generally at least one connecting bore (91, 93) to the interior of the Compressed gas cylinder and at least one outlet hole (115) to the outside in the thickened, solid bottom plate 202. By such receiving and connecting holes formed from the originally massive, thickened bottle bottom 202, a valve block 30 in which the required for the application of the compressed gas cylinder 28 valves and fittings can be completely installed. A variant of a compressed gas cylinder 280, which is generated in this way is shown in Fig. 15. Although preferred receiving bore are provided, which perform the dual function of valve seat and valve housing, it is also conceivable to provide receiving bores, which merely serve as a receptacle for conventional valves. In the latter variant, however, the advantage is lost that the connection sealing surface of a conventional valve with its own housing is unnecessary if the receiving bore also forms the valve seat.

It will be noted that by such a manufacturing method, a compressed gas cylinder 28, 280 is generated, in which a valve block 30 is an integral part of the compressed gas cylinder 28, 280. This is made possible, in particular, by the solid, thickened base plate 202 which is produced during the reverse extrusion, and which forms the bottom of the bottle and serves as the basic body for the armature block 30 produced in the further process.

In order to accommodate the valves and fittings, the expansion of the solid, thickened bottom plate 202 after Rückwärtsfließpressen preferably at least 50mm and can be 5 to 15 times the wall thickness of the bottle jacket.

Of course, a plurality of housing and valve seat bores (89, 95, 97) can be accommodated in the solid, thickened bottom plate 202. The conduit connections between the valves incorporated later herein are preferably formed by connection bores (99, 101, 107) in the thickened, solid bottom plate 202, which run obliquely with respect to the longitudinal axis of the compressed gas cylinder. This makes it possible to make the processing of the compressed gas cylinder blank 200 as far as possible from the end face of the bottom plate 202. As can be seen in Figures 2 and 7-13, the housing and valve seat bores (89; 95; 97) are multi-step bores which receive the male part Components accordingly.

• • Anbringen eines Anschlusses im Flaschenhals 206, beispielsweise eines Füll- oder Prüfanschlusses (86), oder aber lecksicheres Verschließen des Flaschenhalses 206;
• • Maß- und Formgenaues Bearbeiten der Außenfläche des Flaschenmantels 204 als zylindrische Führung für einen Ringkolben (20), beispielsweise durch ein spanendes Drehwerkzeug;
• • Anfertigen einer oder mehrerer Aufnahmebohrungen (109, 117, 119) für Armaturen (64, 88, 94), welche keine Ventilfunktion besitzen, sowie gegebenenfalls, entsprechender einer oder mehrerer Verbindungsbohrungen (93; 111) zur Druckgaskammer 26 der Druckgasflasche 280 oder aber einer oder mehrerer Verbindungsbohrungen (107) zu einer Gehäuse- und Ventilsitzbohrung (89; 95; 97).
• • Maß- und Formgenaues Reiben der Gehäuse- und Ventilsitzbohrung(en) (89; 95; 97) und/oder der Aufnahmebohrung(en) (109, 117, 119) in der Bodenplatte 202 für die Einpassung entsprechender Ventileinsätze (98, 102, 104);
• • Anfertigen von Innengewinden in der/den Gehäuse- und Ventilsitzbohrung(en) (89; 95; 97) und/oder in den Aufnahmebohrung(en) (109, 117, 119) innerhalb der verdickten Bodenplatte 202, so dass Ventileinsätze (98, 102, 104) oder Armaturen (64, 88, 94) mit entsprechenden Außengewinden eingeschraubt werden können;
• • Einbau von Ventileinsätzen (98, 102, 104) und ggf. anderen Armaturen (64, 88, 94) in die entsprechenden Gehäuse- und Ventilsitzbohrung(en) (89; 95; 97) und/oder in den Aufnahmebohrung(en) (109, 117, 119)
• • (optional) Anfertigen von einer äußeren, umfänglichen Halterungs-Nut (siehe Fig.2) im Bereich des Flaschenhalses 206 und/oder einer Halterungs-Nut 210 im Bereich der Bodenplatte 202, welche zur Halterung der Druckgasflasche 28 in einem Löschmittelbehälter 10 mit entsprechenden Verschlüssen 14, 16 zusammenwirken.

15, which is suitable for installation in an extinguishing agent container 10 according to the second embodiment in FIG. 2, the production method preferably furthermore comprises one or more of the following steps:

• • attaching a port in the bottleneck 206, such as a filling or test port (86), or leak-tight closure of the bottle neck 206;
• Dimensionally accurate shaping of the outer surface of the bottle jacket 204 as a cylindrical guide for an annular piston (20), for example by a cutting turning tool;
• • Making one or more mounting holes (109, 117, 119) for valves (64, 88, 94), which have no valve function, and optionally, corresponding one or more connecting holes (93, 111) to the pressure gas chamber 26 of the compressed gas cylinder 280 or one or a plurality of communication holes (107) to a housing and valve seat bore (89, 95, 97).
• Dimensionally accurate reaming of the housing and valve seat bore (s) (89, 95, 97) and / or the receiving bore (s) (109, 117, 119) in the bottom plate 202 for fitting corresponding valve inserts (98, 102, 104);
• Forming internal threads in the housing and valve seat bore (s) (89, 95, 97) and / or in the receiving bore (s) (109, 117, 119) within the thickened bottom plate 202, such that valve inserts (98, 102, 104) or fittings (64, 88, 94) can be screwed with corresponding external threads;
• • Installation of valve inserts (98, 102, 104) and, if necessary, other fittings (64, 88, 94) into the corresponding housing and valve seat bore (s) (89, 95, 97) and / or into the mounting hole (s) ( 109, 117, 119)
• • (optional) Make an outer, circumferential mounting groove 2) in the area of the bottle neck 206 and / or a retaining groove 210 in the region of the base plate 202, which cooperate with corresponding closures 14, 16 for holding the compressed gas cylinder 28 in an extinguishing agent container 10.

• verbesserter Schutz der Ventile und Armaturen gegen Beschädigung dadurch, dass die Ventile und Armaturen geschützt im Flaschenboden eingebaut werden können;
• verbesserte Dichtheit durch Vermeidung der üblichen Dichtfläche am Flaschenhals;
• kompakte, platzsparende Bauweise, durch Integration der Ventile / Armaturen in den Flaschenboden.

Of course, not all of these steps are necessary for the production of a compressed gas cylinder with integrated valves and valves in the bottom of the bottle. Important advantages of such a compressed gas cylinder 28, 280 are, for example:

• improved protection of valves and fittings against damage by the fact that the valves and fittings can be installed protected in the bottom of the bottle;
• improved tightness by avoiding the usual sealing surface on the bottle neck;
• compact, space-saving design, by integrating the valves / fittings in the bottom of the bottle.

It should be noted that such a novel compressed gas cylinder can certainly prove advantageous in other fields of application. In particular, by avoiding potential damage or shearing the valves / fittings during transport of the compressed gas cylinder, this is interesting for safety-relevant applications, in addition to the fire-fighting equipment, for example in the medical field, e.g. for emergency respirators. Even in other areas in which small bottle systems are used, such as in beverage technology for the carbonization of beverages, the compact and safe design of such a compressed gas cylinder is advantageous.

Finally, some of the various advantages of both embodiments of the extinguishing agent container according to Fig.1 and Fig.2 should be mentioned. An important advantage is that the separation of the propellant space 24; 24 'from the pressure gas chamber 26; 26 'is a controlled pressurization of the propellant space 24; 24 'is enabled. It can be a switching valve 32; Arrange 32 'for controlled pressurization of the propellant space, so that both propellant space 22; 22 'and pressure medium space 24; 24 'during the operational idle state are not under operating pressure. This reduces on the one hand the susceptibility to leaks and on the other hand, the design requirements of the extinguishing agent container 10; 10 '. By the separate pressure gas chamber 26; 26 'also arranging a pressure regulating valve 52 (not shown in Fig.1) is made possible. The Duckregelventil 52 prevents the unwanted drop from the extinguishing agent pressure in the extinguishing agent space 22; 22 'and thus the drop in the extinguishing agent throughput during the deletion process. This results in the improvement of the coordination between extinguishant pressure and atomizer nozzles 80 usually connected to the outlet of the extinguishing agent container. As a result, the piston 20; 20 'around the pressure gas chamber 26; 26 'is arranged axially displaceable, the advantages of a piston extinguishing agent container are maintained in a space-saving manner, and in particular allows the above advantages without additional external pressure vessel. The extinguishing agent container 10; 10 'can be through this design as a compact module together with pressure vessel 28; 28 'and install fittings, remove and replace if necessary, for example, for statutory maintenance purposes.

The second embodiment according to Figure 2 gives further advantages. On the one hand, this extinguishing agent container 10 is designed to save space, since special holders for the compressed gas cylinder 28 omitted, and the valves are largely installed in the built-in pressure cylinder 28 dash block 30. The latter also protects the fittings from damage, e.g. during transport or improper use. Furthermore, the storage of the propellant gas is improved with regard to its safety against leaks, in that at least one sealing surface to be sealed between bottle neck and fittings is eliminated.

Finally, it will be noted that each of the fire extinguishing devices 50, 50 ", 50 '" constitutes an automatic protection device operating without external energy which triggers automatically in the event of a fire.

Claims (16)

Fire-extinguishing device comprising an extinguishing agent container with a container casing closed on both sides and a piston which can be axially displaced in the container casing and which separates an extinguishing agent space from a propellant space in the extinguishing agent container,
marked by
a pressure gas chamber located inside the extinguishing agent container and spatially separate from the propellant space for the controlled pressurization of the propellant space, the piston being displaceably arranged along the pressure gas chamber. Fire extinguishing device according to claim 1, wherein the container casing is cylindrical and the compressed gas chamber is arranged in the extinguishing agent container coaxial with the container shell. Fire extinguishing device according to claim 1 or 2, further comprising a pressure cylinder inside the extinguishing agent container with at least partially cylindrical outer wall, wherein the piston is designed as an annular piston and slidably guided along the cylindrical portion of the outer wall of the compressed gas cylinder. A fire extinguishing device according to claim 1 or 2, further comprising a cylindrical guide casing arranged inside the extinguishing agent container and a compressed gas cylinder arranged inside the cylindrical guide casing, wherein the piston is designed as an annular piston and guided displaceably along the cylindrical guide casing. Fire extinguishing device according to one of the preceding claims, further comprising a switching valve for controlled pressurization of the propellant space, which is connected on the input side to the pressure gas chamber and the output side to the propellant space to feed the propellant space by opening the switching valve with compressed gas. A fire extinguishing device according to claim 5, further comprising Pressure control valve for controlled pressurization of the propellant space, which is connected to the input or to the output of the switching valve to pressurize the propellant space with compressed gas at a predetermined, substantially constant pressure during the deletion process. A fire extinguishing device according to claim 5 or 6, wherein the switching valve has at least one pneumatic control port, further comprising a temperature-sensitive, pressurized detector line which is connected to the pneumatic control port of the switching valve to open the switching valve upon pressure drop in the detector line. Fire extinguishing device according to one of claims 5 to 7, comprising a switching valve having a first and a second pneumatic control connection, a first pressure regulating valve, and a connection for a detector line, wherein the first pressure control valve is connected directly to the input side of the pressure gas chamber and the output side to the input of the switching valve wherein the connection for the detector line to the first control port and the output of the first pressure control valve is additionally connected to the second control port, and wherein the switching valve is connected on the output side to the propellant space. Fire extinguishing device according to claim 8, further comprising a second pressure regulating valve, which is connected on the input side at the output of the first pressure regulating valve and the output side at the input of the switching valve or input side at the output of the switching valve and the output side of the propellant space. Fire extinguishing device according to claim 8, further comprising a second pressure regulating valve which is connected on the input side to the first control connection and on the output side to the connection for the detector line. A fire extinguishing device according to any one of claims 8 to 10, further comprising a compensating line for compensating for leaks in the detector line which are at the outlet of the first pressure regulating valve connected and connected to the terminal for the detector line, wherein in the compensation line a check valve is arranged, which prevents excessive loss of propellant through the compensation line at high pressure drop in the detector line. A fire extinguishing device according to any one of claims 5 to 11, further comprising a creeping gas safety device which is connected to the outlet of the switching valve to prevent a creeping pressure build-up in the propellant space. Fire extinguishing device according to any one of claims 5-12, further comprising a compressed gas cylinder inside the extinguishing agent container, the compressed gas cylinder comprising the pressure chamber and having a thickened bottle bottom, which accommodates at least the switching valve, the first pressure regulating valve and optionally the second pressure regulating valve as a valve block. Fire extinguishing device according to claim 13, wherein the connecting line, which leads via the switching valve, the first pressure regulating valve and optionally the second pressure regulating valve from the pressure chamber to the propellant space formed by holes in the dashboard. Fire extinguishing device according to one of the preceding claims, further comprising a compressed gas cylinder inside the extinguishing agent container, wherein the compressed gas cylinder occupies 10% to 35% of the usable volume of the extinguishing agent container. A fire extinguishing device according to any one of the preceding claims, wherein the piston comprises an inner guide bushing for guiding on the cylindrical part of the compressed gas cylinder or on the guide casing and an outer guide shirt for guiding on the container casing and wherein the guide bushing has a smaller axial extent than the guide shirt.

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