tube heater

The subject matter relates to a fire fighting system with a heating means.

In the field of mobile fire fighting systems, which are encompassed representational, consists in the use of aqueous extinguishing agents, always the risk of freezing of the extinguishing agent. If water is used as representational extinguishing agents, in particular in representational high-pressure water mist systems, it may happen that freezing at very low temperatures, particularly below 0 ° C, the extinguishing agent. This leads to two problems. On one hand, water expands upon freezing, so that the risk of bursting of the extinguishing agent tank, arranged at the outlet of the extinguishing agent container valve or other device is to be feared in the fire-fighting system. On the other hand in frozen extinguishing a fire fighting is no longer possible. Rather, it is necessary to thaw the extinguishing agent first to the

to bring fire suppression system in a standby state.

Conventionally, as is also the case in representational fire fighting systems, using at least one extinguishing agent container, in which

Extinguishing agent is stored, for example water. There are two systems, which are encompassed representational, on the one hand so-called bottle systems in which the extinguishing agent is stored in the extinguishing agent container permanently under pressure. This system may trigger self-sufficient, without a pump or some other blowing agent is necessary in order to drive the extinguishing medium from the extinguishing agent container. In so-called two-cylinder systems, in a bottle, the

stored extinguishing agent without pressure and a second bottle stores the propellant, in particular a fuel gas, for example nitrogen under pressure. In the case of

Triggering a valve between the two cylinders is opened, so that the

Propellant expels the extinguishing agent from the extinguishing agent container.

In both systems, however, is the risk of freezing of the extinguishing agent

present, which must be met. This is nowadays, in particular in high-pressure extinguishing agent containers, achieved by heating mats which are arranged on the outer wall of the extinguishing agent container. In conventionally used steel cylinders as extinguishing agent container, so-called steel pressure cylinders, however, it is necessary to first heat the cylinder to then heat the stored inside the cylinder extinguisher. Since a so-called inside of the steel cylinder usually "liner", an inner plastic layer, is arranged on the inner wall, a further insulation layer between the heating mat and the extinguishing medium to be heated is present. This increases on the one hand the

Energy consumption for heating the extinguishing agent and on the other the duration until the extinguishing agent is heated. In addition, the liner also limits the introducing energy, since too high a flow of energy could damage the liner result.

Especially in the representational also included in the application

Rail vehicles, the operational readiness of the fire-fighting system must be guaranteed immediately upon start-up of the rail vehicle, however. If the vehicle overnight, for example, in the cold and the extinguishing agent is frozen, an unnecessarily long time is necessary to wait for the start of operation until the rail vehicle can actually be used for passenger transport, namely only when the firefighting system is ready for use, so it is thawed, the extinguishing agent ,

Thus, the task of the operational readiness of the object was based

to manufacture fire-fighting systems faster and to make the liquid holding the extinguishing medium energy efficient.

This object is objectively by a fire-fighting system according to

Claim 1..

The fire fighting system in this case comprises a pressure-proof extinguishing agent container. Such an extinguishing agent container on the one hand for example, be a steel cylinder in which the extinguishing agent, for example water, can be stored under pressure or without pressure. In the steel cylinder a so-called liner can be provided which protects the inner wall of the steel cylinder from corrosion. In addition, the extinguishing agent container may be, for example, a composite container, for example made of a plastic composite material, preferably from a

Plastic fiber composite material. Here, especially type 4 are composite container. The fiber composite materials, for example,

be glass fiber composite materials or carbon fiber composites.

In the extinguishant container at least one opening is preferably arranged. The opening is usually provided as an outlet of the bottle neck, but may preferably be in composite -Behältern at any other desired point of the

be extinguishing agent container provided. The opening can not be designed only as an outlet, but it is also possible that the objective aperture is an inlet or is formed only as a service opening, through which a heating means and / or a sensor is inserted into the extinguishing agent container. Extinguishing agent may be introduced into the extinguishing agent container or in a two-bottle system, a propellant may be driven into the extinguishing agent container to expel the extinguishing medium from the extinguishing agent container via an inlet.

In the opening of a tube is preferably arranged. This tube is preferably within the extinguishing agent container when the opening of the outlet is formed as a riser tube, through which the extinguishing agent may be driven out of the extinguishing agent container. The riser terminates in an adapter piece at the opening and is transferred to an outlet outside the extinguishing agent container. The riser pipe and the exhaust pipe may be integral as well as several pieces. The adapter piece may preferably be designed as a sealing of the tube at the opening, so that the tube is guided pressure-tight manner in the interior of the container.

Objective has now been realized that heating of the extinguishing agent is best done where the extinguishing agent is supported themselves, immediately on extinguishing agents. It is proposed that the heating of the inside

Extinguishant container is arranged. To optimize the compressive strength of the extinguishing agent container, it is advantageous if as few openings are provided on the extinguishing agent container. Since the outlet anyway on

Extinguishing agent container is provided, preferably in the opening

arranged tube acted upon by a heating means so that a double tube from heating means and the tube is formed, which through the opening into the interior of the

Extinguishing agent container is performed.

On the tube, the heating means is arranged directly, so that the tube and the heating means preferably form a module. The sheet heating means is disposed on the outer surface of the tube and encompasses it at least partially.

Preferably, the heating means is formed as a flat part, which results in at least a heating resistor in a single substrate. The heating means may in

Settlement to be a flat part, which can be wrapped around the pipe. Preferably, in the interior of the heating means at least in areas no voids, so that the heating means can be clamped on the opening, in particular via the adapter, to thus seal the opening against the heating means including the tube.

It has been recognized that the wrapping of the pipe with a full-surface heating means is advantageous when the heating means is formed as a heating jacket. A heating sleeve can be used as a flat component, which is preferably formed from a solid material to be molded. In the solid material, a heating element may be at least performed as heating coil.

According to one embodiment it is suggested that the heating sleeve completely surrounds the tube. By fully engaging around, in particular in parts along the longitudinal axis of the tube, particularly in an area of ​​the opening can be ensured that the opening can be sealed. In addition,

provided the largest possible area of ​​the heating jacket for heating the extinguishing agent through the gripping.

In one embodiment, the heating means may also be formed of a heating wire which is wound around the pipe. The tube is preferably a dip tube. The heating means may be wound as wire-shaped heating means around the mantle surface of the pipe. Also, the wire-shaped heating means may be moved at least in part within the tube and secured.

Also, the heating sleeve can engage around the tube at least in the region of the opening and the interior of the extinguishing agent container. Surrounds the heater sleeve the tube in the interior of the extinguishing agent container, the effective heating surface is maximized.

Surrounds the heater sleeve the tube in the region of the opening, so it as described above, it is possible gas- the extinguishing agent container and / or liquid-tight manner to seal between the heating jacket and inner periphery of the opening.

According to one embodiment, it is possible that the pipe forms a double-walled tube with the heating means. The heating means may be arranged around the pipe outer tube, wherein between the tube and the outer tube an annular space is preferably formed. Preferably, the outer tube is metallic and in the

Annular space between the tube and the outer tube is at least one, preferably two heating resistors out. The heating resistor is preferably coiled in the annular space between the tube and the outer tube.

According to one embodiment it is suggested that the in the annular space is not filled by the heating resistor volume is filled with an electrically non-conductive material. Here are preferably non-conducting metal alloys, or metal oxides, particularly magnesium alloys or magnesium oxides or oxides of the respective alloys.

According to one embodiment it is suggested that the heating means is formed of a planar base body with at least one arranged in the base body heating resistor. Preferably, the heating means is formed of a flat part made of solid material, in which the heating resistor is guided. For this purpose, the

Heating element embedded in the solid material of the base body. Preferably, the solid material of the base body is electrically nonconductive.

According to one embodiment it is suggested that the heating means is a metallic heating sleeve. Characterized in that the heating sleeve is metallic, a particularly simple sealing of the opening between the sleeve and

take place inside perimeter of the opening, as for example with a

Compression connection or an O-ring can be performed a corresponding sealing of the metallic heating sleeve in the same manner as

conventionally takes place the sealing of the opening arranged in the riser.

The sleeve is in particular of a non-conductive metal alloy or a non-conducting metal oxide, for example, formed with a magnesium component. In the material of the heating jacket, a heating resistor is preferably arranged, preferably embedded and completely surrounded by the material of the heating sleeve.

Preferably, the heating jacket or the heating resistor and the material of the heating sleeve of a plastically deformable material-destructive are formed. In particular, the ductility is such that the heating jacket

can wrap around the circumference of the tube without destruction. Thus, the pipe or the pipe radius, determines the minimum bending radius which the material of the

Heating jacket allows. Preferably, the heating sleeve is bent around the pipe or coiled. In addition to the wrapping of the heating sleeve around the pipe, the pipe can be bent within the extinguishing agent container. Together with the tube, the heating sleeve can thus also in the interior of the extinguishant container

be curved. Preferably, the tube is in the direction of an outer wall of the

Extinguishant container bent.

As already mentioned, in an erase center container normally a riser is provided, particularly if the opening is an outlet. To this extent, the pipe according to an embodiment is a riser.

According to one embodiment it is suggested that the heating means is arranged on the pipe at least in the region of the opening and inside of the extinguishing agent container. Arranging in the area of ​​the opening allows easy sealing, wherein disposing inside the extinguishing agent container, the

allows direct effect of the heating on the extinguishing agent.

According to one embodiment it is proposed that is a Löschmittelauslass at the opening preferably, a valve is arranged. In particular, the riser pipe and the pipe opens in the interior of the extinguishing agent container via the adapter into the valve. the tube through the valve can be opened and

close. Starting from the valve, the heating means may extend across the opening into the interior of the extinguishant container along the pipe. Thus, the heating means of the valve extends over the opening to the interior of the extinguishing agent container. Outside the extinguishing agent container, in particular in the area of ​​the valve or the adapter piece, an electrical connection of the heating resistor can be made.

Preferably, the heating means is formed such that initially has an electrical supply line, which has a lower electrical resistance in the heating is to take place than in the region. Thus, the heating means preferably has a leading region and a heating region, wherein both regions are preferably in a like manner to the tube disposed, but different electrical

comprise resistors. Preferably, the feed region extends up to 10%, especially up to 15% of the tube length into the interior of the container. This is especially useful when the container is filled with a filling ratio of less than 100%, more preferably about 90% full. The heating is thus to be interpreted, that is not heated in the upper region, that is, the upper region which is not in contact during operation with the extinguishing medium. the electrical

Connection in the power supply should have a minimum electric power loss.

According to one embodiment it is suggested that the tube and the heating means are mounted directly adjacent to one another. The directly abut one another means that no air gap is present between the pipe and in particular heating means. Preferably, between the heating means and the

Mantle surface of the pipe, an adhesive is provided, which causes a sealing means of adhesion or sticking of the heating medium to the tube.

To be without filling the extinguishing agent container with extinguishing liquid

fear that extinguishing liquid flows out, and also for example, be able to establish a gas pressure in the extinguishant container, sealing the opening is necessary. The tube itself is preferably closed over the valve. The outer wall of the heating jacket must be accountable to the opening of the

Extinguishing agent container to be sealed. Preferably, this sealing is liquid-tight according to an embodiment and / or gas-tight.

According to one embodiment, the heating means is a double cylinder together with the pipe. The heating means is guided at its lateral surface at the opening by a seal. This produces a sealing between

Circumferential surface of the heating means and opening or inner periphery of the opening allows, so that the extinguishing agent container on the seal liquid-tightly and / or is sealed gas-tight.

As already mentioned, the heating means is preferably a heating resistor. This heating element may be provided according to an embodiment with an electrical connection outside the extinguishing agent tank, so that it can be acted upon via this electrical connection of the heating resistor with electric power.

To achieve the object, a fire fighting system is proposed, wherein the heating means comprises at least two independently switchable heating circuits. It has been recognized that, depending on the respective heating of the extinguishing agent by two independently switchable heating circuits of the

can be carried out environmental condition. Here, it is usually possible, the

Cooling of the extinguishing medium in the control operation by a relatively low

to prevent power supply. It may be sufficient, with 50W to 100W some electric heating, the cooling of the extinguishing agent at

Ambient temperatures in order to prevent the freezing point around.

Also that the heating means is supplied with different heating power, wherein the heating power is automatically adjusted to the environmental conditions is proposed.

In case of prolonged standstill of preferably mobile fire fighting installation, for example in a rail vehicle, but it may no longer be able to maintain this state of the liquid extinguishing agent at very low temperatures. Then the extinguishing agent freezes and needs to the operational readiness of

to manufacture fire-fighting system quickly thawed quickly. For this purpose, a second heating circuit can be switched on and are supplied with electrical energy, which can be operated with a higher electric power than the first heating circuit. Also, a supply of electric

Heating adapted situationally made to the environmental conditions.

In particular, the heating circuits can be operated with heating resistors different cable cross-sections. The heating resistor having the smaller line cross section can be designed for the reduced electric power and by its corresponding specific resistance even at lower

at a good efficiency converting electrical power, the electrical energy into heat energy. The heating circuit to the heating resistor with the larger diameter cable can be used for the rapid heating. In this case, the current would be too high in the heating conductor with the lower line cross section and this would be destroyed. Therefore, the second heating circuit, which is designed for the higher current strengths.

The two heating circuits can be switched independently of each other, but be applied simultaneously with electric power, so as to achieve the maximum heating capacity.

According to one embodiment it is suggested that the heating circuits each having at least one heating resistor. The heating resistor is preferably a heating wire with a respectively matched to the heat output of specific resistance and / or duct cross-section. In particular, the line cross-section relevant to the current-carrying capacity, which is preferably different for the two heating resistors.

According to one embodiment it is proposed that a first

has a heating resistor with respect to a second heating resistor smaller specific resistance value. The heating resistor with the smaller

electrical resistance contributes to higher electrical current and is

preferably operated with the higher electric power. The power loss over the heating resistor, which is converted into heat power, thus to this heating resistance higher than at the heating resistor with the greater specific resistance.

The two heating resistors are preferably designed for the voltage applied thereto, respectively electric heating power or electric power so that their

Melting points are preferably different from each other. with the help

different heating resistors, it is possible to adjust the heating power to the respective heating power, in particular the respective electric power introduced.

As already mentioned, both the heating circuits each having a different heating power, in particular different electrical power can be operated. To this extent, it is expedient, a first heating resistor having a first

to connect voltage source and a second heating resistor to a second voltage source. Preferably, one of the voltage sources, at least one DC voltage source.

As already explained, the objective fire fighting system is particularly suitable for heating of the extinguishing liquid in different situations, so that it is advantageous to operate the power sources at different voltages, so that the heating resistors are supplied with different electrical voltages. Tensions are doing

preferably DC voltages.

To maintain a certain temperature of the extinguishing liquid over a long period, a low DC voltage, for example a 24 V or a 110 V DC voltage is. The 110 V DC can be used for defrosting, and the 24 to maintain the liquid state. Both voltages can be fed for example from an accumulator. A second DC voltage may preferably have a power supply of a

Board network. In particular, a second DC voltage may be 380 V or 400 V. The higher voltage can eg be pulsed to control the heating energy

Preferably, the heating circuits are encapsulated in a common housing of the heating means. In particular, the heating circuits are arranged in the heating sleeve. The heating means may be disposed in and / or on the extinguishing agent container.

In particular, the heating sleeve can be connected to a riser within the

be arranged extinguishing agent container. It is also possible that the heating sleeve is disposed on the outer surface of the extinguishing agent container, is wound around the extinguishing agent container around especially in the form of a heating mat.

Heating means may also be arranged only at the adapter or the adapter head in the area of ​​the opening of the extinguishing agent container. The heating means is disposed only outside the extinguishing agent tank, it is possible for a better

Heat transfer improved thermal conductivity of the tube, in particular of the riser can be used. For this reason, it is also proposed that the riser tube consists of a metal material, preferably copper material is formed, which has a relative to a stainless steel tubing increased thermal conductivity. The arrangement of the heating means only the adapter head is to be regarded as independent, but can be combined with all other features as described herein combine.

According to one embodiment it is proposed that at least one

Temperature sensor is arranged in or on the extinguishing agent container. With the help of the temperature sensor, it is possible to detect the temperature of the extinguishing agent container and / or the temperature of the extinguishing agent. By evaluation of the measured temperature from the temperature sensor a Intrusion of the heating means can be controlled.

For this reason, according to an advantageous embodiment

proposed that a controller controls a function of a detected temperature of at least one temperature sensor, the charging of the heating resistors with electrical voltage. In the controller, a hysteresis may be programmed, for example, so that a heating circuit is switched on when falling below a threshold temperature and is turned off again only when overwriting a second, higher than the first limit temperature of the heating circuit.

For use in fire fighting systems, preferably in

High-pressure water mist systems, it is necessary that the extinguishing agent container

is pressure-resistant. This is particularly a compressive strength of 5 bar, preferably 50 bar, in particular 100 bar are possible.

Another aspect is a method of operating a

Fire-fighting system. Here, at least a temperature of the

Extinguishing agent container and / or of the extinguishing agent detected in the extinguishing agent container. the measured temperature falls below a first threshold temperature, only the first heating circuit is first activated. A second, smaller than the first

Limit temperature is undershot, the second heating circuit is activated. Activating the second heating circuit can be done cumulatively or alternatively to the first heating circuit.

By forming a hysteresis control when exceeding the second limit temperature of the second heating circuit can remain activated initially, to a third, larger than the second threshold temperature is reached and only then is the second heating circuit is disabled. Also for the first boundary temperature and the first heating circuit a hysteresis control can be established such that when the first only when overwriting a fourth limit temperature that is greater

disables limit temperature of the first heating circuit.

Upon activation of the heating circuits these are respectively applied with an electric voltage. In particular, one of the voltages may be a

his vehicle electrical system voltage of a rail vehicle.

For use at different temperatures of the extinguishing agent, it is useful if the first heating circuit with a smaller heating capacity is operated as the second heating circuit.

The subject matter is described in detail with reference to embodiments displayed drawing. In the drawing:

. Figure 1 shows a fire fighting system;

Figure 2 is a schematic view of a pipe with a heating jacket.

Fig. 3a shows a schematic plan view of a heating sleeve,

FIG. 3b is a sectional view of a heater sleeve;

Fig. 4 is a sectional view of another embodiment of a heating medium;

Figure 5 is a winding of a heating means around a pipe.

Fig. 6 shows an arrangement of a heating medium to an extinguishing agent container;

Fig. 7 shows a schematic arrangement of an electrical heating means with

Voltage supply;

Fig. 8 is a schematic view of an outlet including temperature sensors, and

Steigrohr;

Fig. 9, an operation of an objective fire suppression system;

Fig. 10 is a schematic view of a rail vehicle having a

figurative fire fighting system.

Fig. 1 shows a fire fighting system 2 with an extinguishing agent container 4. In the extinguishing agent container 4 is a riser 6 is provided which opens out via an adapter piece 8 in a valve 10. The adapter member 8 is arranged in the region of an outlet opening 12 of the extinguishant container 4 and there preferably sealingly screwed.

The extinguishing agent container 4 is a steel cylinder in the variant shown having a liner 14 made of plastic on its inner surface to protect the material of the extinguishing agent container 4 against corrosion. In the extinguishing agent container 4 is extinguishing liquid 16, in this case in the form of water stored under pressure.

Preferably, the extinguishing agent container 4 is at a resting pressure of about 5 bar, preferably over 20 bar, in particular about 100 bar in a standby mode. By opening the valve 10, the extinguishing liquid is expelled 16 from the riser 8 from the extinguishing agent container 4 and can then, for example, a

High pressure water spray system and corresponding high-pressure mist nozzles

are applied. However, it is also conceivable that the present

Fire fighting system with conventional sprinkler systems is used, since there exists the problem of freezing.

can at the location shown firefighting system 2, the subject

Heating means are used.

Fig. 2 shows the riser pipe 6, which is encased by a heating jacket 18. The heating jacket 18 is directly connected to the outer wall of the tube 6, for example by gluing. Preferably, the connection between the heating jacket 18 and dip tube 6 is such that there is no gap between the outer wall of the tube 6 and the heating sleeve is formed. 8 In particular, the connection between the heating jacket 18 and dip tube 6 such that between the heating sleeve 18 and riser pipe 6, no gas or liquid can flow.

As can be seen, in the heating jacket 18, at least one heating resistor 20 is provided. The heating resistor 20 is encapsulated within the heating sleeve 18 and coiled about the tubing around the assembled state. The material of the

Heating jacket 18 is preferably a solid material, in particular of a non-conductive metal alloy or a non-conductive metal oxide formed. Inside the heating jacket 18, a heating resistor is guided at least 20 as a heating wire. The insulating property of the material of the heating jacket 18 of / can

the heating resistors 20 can be performed directly in the material of the heating sleeve 18th

Fig. 3a shows a development of a heating jacket 18 in a plan view. In the heating jacket 18, two heating resistors are separated from each switchable 20a, 20b out. It can be seen that the heating resistors 20a, 20b via two electrical terminals 22 (22a ', 22a "and 22b', 22b") have. the heating resistors 20a, 20b, which can be designed as heating wires on these two electrical terminals 22 can be, pressurize each with an electrical voltage, which can also be different. The fed into the heating resistors 22a, 22b, electric power can be different, so the

Heating resistors 22a, 22b may have different heating capacities.

The heating jacket 18 can be wrapped around the dip tube 6 around when the material of the heating jacket 18 and the heating resistors 22a, 22b is plastically deformable. In particular, a minimum bending radius can be determined by the outer radius of the riser 16th To such a bending radius of the material of the heating jacket 18 and the heating resistor 20a should, 20b be plastically deformable non-destructive.

FIG. 3b shows a cross section through a heating jacket 18. It can be seen that the conductor cross-sections of the heating resistors 20a, 20b can be large different, resulting in different heating power, in particular different current carrying capacity. The melting points of the materials of the

Heating resistors 20a, 20b may be different.

Fig. 4 shows a further embodiment of a heating medium 6. 24 on a standpipe It can be seen that the heating means 24 of an outer tube 24a and in a

is formed annular space 24b between the outer tube 24a and the riser pipe 6 arranged 24c filler material and at least one heating resistor 20th The

Filler material 24 is preferably electrically non-conductive and thus isolates the heating resistor 20. On the other hand, the material is preferably thermally well conductive, so that the heating power of the heating resistor 20 without large time

Delay over the outer tube 24a can be delivered to the extinguishing agent 16th

A heating jacket 18, as shown in Fig. 3a can be coiled around the riser pipe 6 in the embodiment shown in Fig. 5 or wound form.

A heating wire may be wrapped around the pipe. A single filament may be wrapped around the riser. The heating wire may be formed from an outer layer with a non-conductive oxide, and having inside the actual heating element having an electrically conductive wire, the heating wire is preferably plastically deformable, wherein a bending radius with which the wire can be non-destructively and without injury bent may correspond approximately to the outer radius of the tube. The heating wire may in itself be so flexible that it can be wrapped around the riser.

Alternatively, it is also possible that the wire is not directly mounted on the pipe, but to a fixed to the tube holder.

The heating means must not necessarily be arranged on the riser pipe 6, but may (not shown) and be arranged on the outer surface of the extinguishing agent container 6 also to the adapter piece. 8 In FIG. 6, a mat 26 is shown having two separate switchable switching resistors 20 (not shown). About each separated from one another for mounting components, electrical

Terminals 22 (not shown) can be the heating resistors at different times and with different electrical powers to operate, so that, depending on a temperature of the extinguishing agent container 6 or the in the

Extinguishing agent container 6 mounted extinguishing agent 16, only a heating resistor or, alternatively, two heating resistors can be operated.

The switching on and off of the electrical supply to the heating resistors 20a, 20b shown in Fig. 7. In FIG. 7, 24 is, for example V

DC power supply 28 is shown as an accumulator. In addition, a

Rectifier 30 is provided which is connected to the voltage supply of the vehicle, for example a rail vehicle and provides an electrical DC voltage of 380 V or 400 V is available on its outlets. Via respective switches 32, 34 are rechargeable battery 28 and rectifier 30 to the electrical terminals 22 of the heating resistors 20a, 20b (not shown).

A control circuit 36 ​​receives from an unillustrated temperature sensor providing a temperature signal 38 and evaluates it. Depending includes 38 from the evaluation of the temperature signal or the switches 32, 34. Thus, opens the control circuit 36 ​​at a falling below a first threshold temperature, for example 10 ° C the switch 32 are closed, while the switch remains open 34th With a relatively small electric power of the heating resistor 20a is operated and the temperature of the extinguishing agent 16 is obtained only upright. However, the outside temperature drops further, this low heat output may not be enough. The temperature of the extinguishing agent then falls below a second limit temperature. Also, in a complete shutdown of the two heaters, for example in the stoppage of the vehicle, the temperature of the extinguishing liquid 16 may drop below the second, lower than the first limit temperature. Such a temperature is achieved by a corresponding temperature signal 38, which is evaluated by the control circuit 36 ​​so that the switch is closed 34th The switch 34 can be closed to the switch 32 cumulatively or alternatively to switch 32nd

With the switch closed, the heating resistor 34 is applied 20b with electric power of the converter 30, this electrical power is considerably higher than that of the accumulator 28. This results in a higher thermal

Power loss in the heating resistor 20b, which results in that the extinguishing liquid is heated faster 16th Specifically, when the extinguishing liquid is frozen, the temperature signal 38, for example, reports a temperature from 0 ° C, such a quick heating can be activated.

Fig. 8 shows a detailed view of an opening 4a at an extinguishing agent container 4. It can be seen that the adapter piece 8 is screwed to the opening mouth of the opening 4. Outside of the adapter piece 8, a first temperature sensor may be arranged 40a. Inside the extinguishing agent container 4, a second

Temperature sensor 40b be disposed. The temperature sensors 40a, 40b, 38 may be transmitted to the controller 36 a temperature signal.

It is also possible that the heating wire from the riser in the area of ​​the opening is dissolved 4a and is sealed separately passed through the valve body to the outside, where it is connected to the power source. The internal heating element, for example, the heating wire can be performed internally in the riser outwardly through either the valve body or the like. The heating wire may be an electrical on the valve

Terminal having to power supply, wherein a pressure-tight seal with reticulated connector can be used. On the outside, the electrical connection can then be implemented.

Further, it can be seen that the heating jacket 18 is arranged directly on the riser. 6 The riser 6 together with the heating jacket 18, which is preferably formed at least on its outer surface made of metal, through the

passed adapter piece. 8 In the adapter piece 8, the heating jacket 18 is sealingly received, which is schematically indicated by the O-rings 8a and 8b. The seal is well known and is therefore not described in detail.

Outside the extinguishing agent container 4, the electrical connections 22a and 22b are provided, via which the heating resistors 20a, 20b of the heating jacket 18 can be electrically contacted.

In order to reduce the switching frequency, and to enable safe thawing of a frozen extinguishing agent container 4, the heating resistors 20a, 20b operate with a hysteresis. In FIG. 9, a temperature value on the X-axis is plotted in ° C. Further, the switching states are plotted 1 and 2 on the Y-axis. The switching status of 1 means that only one heater resistor is activated and the

Switching condition 2 means that both heating resistors is activated, thus subjected to electric power. With decreasing temperature, a first heating resistor is activated, for example when reaching a temperature of 5 ° C. This may for example be the one which is supplied with the lower electrical power.

As long as the temperature is moving between 0 and 10 ° C, is the first

Heating resistor turned on. Only when the temperature exceeds 10 ° C, the switching state 1 is left and the first heating resistor switched off again.

the temperature in switching state 1, however, decreases and reaches, for example, 0 ° C, then the switching condition 2 is turned on. In the switching state 2, both heating elements are preferably supplied with electrical power, wherein the second heating resistor is subjected to a considerably higher electric power than the first heating resistor. For further decreasing temperature remains at

Switching state 2. The second heating resistor but deactivated again only when the temperature exceeds 5 ° C. Due to this hysteresis, the switching frequency is reduced.

Fig. 10 shows a rail vehicle 42 with a piping system 44 and

Water spray nozzles 46a-c. The piping system 44 is coupled to two extinguishing agent container. 4 The extinguishing agent container 4 are controlled by a central control 36 which is connected to a fire control panel (not shown). in the

Case of fire be opened via the central unit 36, the valves 10 and extinguishing agent exits from the nozzles 46a-c from.

The controller 36 also monitors a temperature of the

Extinguishing agent container 4 and controls depending on the temperature, a

Power supply 50, which is for example coupled to the central

Power supply of the rail vehicle 42. The control of the extinguishing agent container and the heating is carried therein as described above.

LIST OF REFERENCE NUMBERS

2 fire fighting system

4 extinguishing agent container

6 Steigrohr

8 Adapter

10 valve

12 outlet

14 Liner

16 extinguishing liquid

18 Heating jacket

20 heating resistor

22 electrical terminals

heating means 24

24a outer tube

24b annulus

24c filler

28 Battery

30 rectifier

32, 34 switch

36 control circuit

38 Temperatursignal

40 temperature sensor

42 rail vehicle

44 pipeline system

46 nozzle

50 power supply

P a t e n t a n s p r ü c h e

Fire fighting system including

a pressure-proof extinguishing agent container

at least one arranged in an outer wall of the extinguishant container opening, and

a valve disposed in the orifice tube,

characterized,

that a sheet-like heating means surrounds the mantle surface of the pipe at least partially.

Fire-fighting system according to claim 1,

characterized,

that the heating means is a heating sleeve or that the heating means a

is heating wire, in particular that the heating wire is wound around the pipe.

Fire-fighting system according to any of the preceding claims,

characterized,

that the heating sleeve completely surrounds the tube and / or that the heating sleeve the tube in the region of the opening and the interior of

Extinguishing agent container grips.

Fire-fighting system according to any of the preceding claims,

characterized,

that the heating means is formed by a tube arranged around the outer tube, the outer tube is metallic and in an annular space between the tube and the outer tube, a heating resistor is at least performed.

5. Fire-fighting system according to any of the preceding claims, characterized in that

that the annular space with a filling of an electrically nonconductive material, in particular a metal alloy, in particular a

Magnesium alloy is filled.

6. Fire-fighting system according to any of the preceding claims,

characterized,

that the heating means is formed of a planar base body with at least one arranged in the base body heating resistor.

7. Fire-fighting system according to any of the preceding claims,

characterized,

that the heating means is a metallic heating sleeve, wherein the

Heating jacket is formed in particular from a non-conductive metal alloy with at least one heating element arranged therein.

8. Fire-fighting system according to any of the preceding claims,

characterized,

that the heating sleeve is non-destructive plastically deformable, wherein the heating sleeve is bent around the pipe and / or wherein said heating sleeve is bent together with the pipe inside the extinguishing agent container.

9. Fire-fighting system according to any of the preceding claims,

characterized,

that the pipe is a riser.

10. Fire-fighting system according to any of the preceding claims,

characterized,

that the heating means is arranged on the pipe at least in the region of the opening and inside of the extinguishing agent container.

Fire-fighting system according to any of the preceding claims,

characterized,

that at the opening, which is preferably a Löschmittelauslass, a valve is arranged and / or that the heating means extends from the valve via the opening into the interior of the extinguishing agent container on the pipe.

Fire-fighting system according to any of the preceding claims,

characterized,

that the tube and the heating means bear directly against one another, in particular that the heating means is glued on the outer surface of the tube and / or that the heating means is accommodated sealingly in the region of the opening the extinguishing agent container.

Fire-fighting system according to any of the preceding claims,

characterized,

that the tube and the heating means in liquid-tight and / or gastight

are connected together.

Fire-fighting system according to any of the preceding claims,

characterized,

that the heating means together with the tube has a double-walled cylinder and in that the outer surface of the heating medium is guided to the opening by a seal, so that the extinguishing agent container on the seal

liquid-tight and / or gas-tightly sealed.

Fire-fighting system according to any of the preceding claims,

characterized,

that the heating means outside the extinguishing agent container has at least one electrical connection of a heating resistor.