EP4142894A1

EP4142894A1 - Method and liquid mixing system for providing a liquid/foam mixture

Info

Publication number: EP4142894A1
Application number: EP21733045.5A
Authority: EP
Inventors: Lukas PLATZER
Original assignee: Rosenbauer International AG
Current assignee: Rosenbauer International AG
Priority date: 2020-04-29
Filing date: 2021-04-28
Publication date: 2023-03-08
Anticipated expiration: 2041-04-28
Also published as: CN115715222A; US20230191174A1; AT523064A4; EP4142894B1; AT523064B1; WO2021217193A1; CN115715222B

Abstract

The invention relates to a method and to a liquid mixing system (1) for providing a liquid/foam mixture by mixing water with at least one additive (4, 35). The liquid mixing system (1) comprises a water pressure source (2), an additive storage unit (3, 32), an air compressor unit (5) having a compressor (6) and a drive device (7), first and second mixing devices (8, 10), a discharge unit (13) and a plurality of different pipe networks (16, 18, 20) for the various media. The drive device (7) is a water engine or a water turbine, the water supply line (23) of which is connected by piping to the water pressure source (2).

Description

METHOD AND LIQUID MIXING SYSTEM FOR PROVIDING A

LIQUID-FOAM MIXTURE

The invention relates to a method for providing a liquid-foam mixture by means of a liquid mixing system. Furthermore, the invention also relates to a liquid mixing system for providing the liquid-foam mixture, which is formed by mixing water with at least one additive.

GB 967 792 A1 describes a unit that can be carried along on a vehicle or a helicopter for generating a frog foam for fire fighting. The unit for generating the extinguishing foam includes a water tank, a foam compound container and a compressor. The foam compound container is arranged inside the water reservoir. Starting from the compressor, an air supply line extends above the what serspeichers and is separated from each other with the interior of the water storage tank and also the interior of the foam compound container in flow connection. Furthermore, a mixing device is also provided which is in flow connection with the interior of the water reservoir, the interior of the foam compound container and also with the air supply line via separate connecting lines. The compressor is either operated with a combustion fuel or the compressed air is branched off from the helicopter's turbine. The disadvantage here is that the required compressed air is generated on site by means of an internal combustion engine and therefore an additional environmental burden is created by the exhaust gases.

The object of the present invention was to overcome the disadvantages of the prior art and to provide a method and a liquid mixing system by means of which a user is able to carry out an autonomous operation and thereby for the direct drive of the compressor of the air compression unit of the liquid mixing system, no engine has to be used directly.

This object is achieved by a method for providing a liquid-foam mixture and a liquid-mixing system designed for this purpose according to the claims.

The method is used to provide a liquid-foam mixture by mixing water with at least one additive by means of a liquid mixing system in which the following steps must be carried out:

Providing a water pressure source to deliver the water,

Providing at least one first additive storage unit with a first additive received therein,

Providing an air compressor unit for providing compressed air, comprising a compressor and a drive device, the drive device being in drive connection with the compressor,

Providing a first mixing device with a first mixing chamber for admixing at least the first additive to the water dispensed by the water pressure source,

Providing a second mixing device with a second mixing chamber for the optional admixing of compressed air to the liquid-foam mixture dispensed by the first mixing device, and a connecting line connecting the two mixing devices to one another,

Providing a dispensing unit for dispensing the liquid-foam mixture with a connecting device and a dispensing line, by means of which the connecting device is in line with the mixing devices,

Providing a water pipeline network with at least one first water supply line, by means of which the first water supply line the first mixing device is in pipeline connection with the water pressure source,

Providing an additive conduction network with at least one first additive conduit, by means of which first additive conduit the first additive storage unit is in conduction connection with the first mixing device,

Provision of a compressed air pipeline network with a first compressed air line, by means of which the first compressed air line the second mixing device is optionally connected to the compressor,

Feeding the water from the water pressure source to the first mixing device via the first water feed line,

Supplying at least the first additive from the first additive storage unit to the first mixing device via the first additive line,

Mixing the water with the at least one additive by means of the first mixing device and forwarding the liquid-foam mixture to the dispensing unit and dispensing the liquid-foam mixture from the connection device, furthermore it is provided that the drive device of the air compressor unit is formed by a water motor or a water turbine comprising at least one water inlet and at least one water outlet, that a second water inlet is provided and the at least one water inlet of the water motor or the water turbine via the second water inlet with the Water pressure source in line s is connected that the water from the water pressure source is fed to the water motor or the water turbine via the second water supply line and the water motor or the water turbine is driven by the water under pressure.

In the method steps selected here, it is advantageous that, by means of the compactly designed liquid mixing system for driving the compressor to provide compressed air, there is no need to provide an additional engine to be operated. In the event of fire or emergency operations, water is almost always required as an extinguishing agent. Depending on the existing pressure source, this is also available with a sufficiently high pressure level. By providing a water motor or a water turbine to drive the compressor, the existing water pressure is also used for this purpose. Thus, the water pressure is used on the one hand for the delivery and the mixing in of at least one additive and on the other hand also for the drive of the compressor. With the readiness and / or the connection of the water pressure source to the liquid mixing system, the operation is started and at least one additive is added or mixed into the flowing water. If additional compressed air is required, which is to be added to the liquid-foam mixture, this is also immediately available due to the water drive of the compressor. This not only creates a compact unit, but also takes environmental considerations into account, since no additional power machine, which is mostly and predominantly formed by an internal combustion engine, has to be operated to provide the compressed air. Another advantage is that inspection and / or service work, as required and often prescribed in power machines, in particular in connection with hydraulic drives, can be saved. With the appropriate choice of material, a long-lasting and, above all, low-maintenance liquid mixing system is also created. Another possible advantageous procedure provides that a first additive delivery device, in particular a delivery pump driven by compressed air, is available for the first additive storage unit and a second compressed air line, by means of which the second compressed air line connects the compressor with the first additive delivery device The first additive storage unit is in line connection, and the first additive conveyor of the first additive storage unit is driven by the compressed air supplied in the second compressed air line and the first additive is removed from a first additive storage and via the first additive line first mixing device is fed. An even simpler and more environmentally friendly operation of the liquid mixing system can thus be achieved. The compressed air is available at least for the admixture of the same to the liquid-foam mixture before exiting the dispensing device and can also be used for the operation and admixing of the additive to the water.

Furthermore, a procedure is advantageous in which the water from the water pressure source is taken from a water reservoir with a water pump, a free body of water by means of a water pump, a hydrant and / or a water reservoir loaded with a pressure medium. In this way, in the event of an incident, it is possible to fall back on the different water pressure sources that are usually available. A combination of the water pressure sources with one another would also be possible and conceivable in order to be able to provide the liquid-foam mixture in sufficient quantities for use.

Another advantageous procedure is characterized in that the water emerging from the at least one water outlet of the water motor or the water turbine is diverted into the open. This can be done if there is a sufficient amount of water available.

A variant of the method is also advantageous in which at least one water return line is provided and the water exiting from the at least one water outlet of the water motor or the water turbine is returned via the water return line to the water pressure source, in particular in its pressureless section, and from there again is delivered to the water motor or the water turbine. In this way, the water flow can be implemented in an almost to completely closed circuit for the water drive. In addition, an even more economical operation of the liquid mixing system can be achieved in this way.

Furthermore, a procedure can be advantageous in which a differential pressure control element is arranged in the second compressed air line, from which differential pressure control element determines the water pressure in the first water supply line and sets the pressure level of the compressed air supplied to the additive delivery device on the basis of the water pressure determined will. In this way, depending on the water pressure prevailing in the water supply line to the first mixing device, the pressure level for the operation of the first additive storage unit with its first additive delivery device can be set and / or regulated exactly.

Furthermore, a procedure is advantageous in which a second additive storage unit with a second additive delivery device and a second additive store with a second additive received therein is provided and the compressed air from the compressor is fed to the second additive delivery device via a third compressed air line and is driven and the second additive is removed from the second additive store and fed to the first mixing device via a second additive line. Depending on the additive used or required, the amount available can be increased and there are no change times and the associated downtimes. However, this also creates the possibility of being able to mix and / or add different additives to the water.

Another procedure is characterized when the volume flow of the liquid-foam mixture fed to the second mixing chamber of the second mixing device is adjusted manually and / or pneumatically. This enables the subsequent process of adding compressed air to be set and predetermined even more precisely.

Another advantageous procedure is characterized in that the water is emitted from the water pressure source at a pressure value which comes from a pressure value range whose lower limit is 6 bar, preferably 9 bar, and whose upper limit is 20 bar, in particular 12 bar. This means that the volume flows and the proportioning rates can be varied within wide limits. A variant of the method is also advantageous in which the water motor or the water turbine is supplied with a volume flow that comes from a volume flow value range whose lower limit is 4001 / min, preferably 5001 / min, and its upper limit 2,0001 / min. min, preferably 1,000 l / min. This means that the drive power can be adapted to the required application conditions depending on the volume flow.

The object of the invention can, however, also be achieved independently of this by a liquid-mixing system for providing a liquid-foam mixture which is formed by mixing water with at least one additive. The liquid mixing system comprises a water pressure source, which water pressure source is designed to dispense the water, at least one first additive storage unit, which first additive storage unit is designed to receive a first additive, a pneumatic compressor unit comprising a Compressor and a drive device, wherein the drive device is in drive connection with the compressor, and wherein the air compressor unit is designed to provide compressed air, a first mixing device with a first mixing chamber, the first mixing device for the optional admixing of at least the first Additive to the water delivered by the water pressure source is formed, a second mixing device with a second mixing chamber, which second mixing device is designed for the optional admixing of compressed air to the liquid-foam mixture delivered by the first mixing device, and one of the two mixing devices gen interconnecting connecting line, a delivery unit with a connection device and a delivery line, with means of which delivery line the connection device is in connection with the mixing devices, wherein the delivery unit is designed to deliver the liquid-foam mixture cal, a water pipe network with at least a first Water supply line, by means of which first water supply line the first mixing device is in line with the water pressure source, an additive line network with at least one first additive line, by means of which first additive line the first additive storage unit with the first mixing device is in line connection, a compressed air line network with a first compressed air line, by means of which first compressed air line the second mixing device is optionally in line connection with the compressor, it is further provided that the drive device of the air compressor unit by a water motor or a water turbine comprising at least one Water inlet and at least one water outlet is formed that a second water inlet is provided that the at least one water inlet of the water motor or the water turbine is connected to the water pressure source via the second water inlet line with the water pressure source.

The advantage achieved in this way is that, by means of the compactly designed liquid mixing system for driving the compressor, which is used to provide compressed air, there is no need to provide an additional engine to be operated. Water is almost always required as an extinguishing agent during fire or emergency operations. Depending on the existing pressure source, the water is also available with a sufficiently high pressure level. By providing a water motor or a water turbine to drive the compressor, the existing water pressure is also used for this purpose. This means that the water pressure is used on the one hand for the delivery and the admixing of at least one additive and on the other hand for driving the compressor. When the water pressure source is connected to the liquid mixing system, operation is started and at least one additive is added or mixed into the water flowing through. If additional compressed air is required, which is to be added to the liquid-foam mixture, this is also immediately available due to the water drive of the compressor. This not only creates a compact structural unit, but also takes environmental considerations into account, since no additional power machine has to be operated to provide the compressed air.

Another possible preferred embodiment is characterized in that a first additive delivery device, in particular a delivery pump that can be driven by means of compressed air, a first additive storage unit in the first additive storage unit for receiving the first additive and a second compressed air line are provided, by means of which second compressed air line of the compressor with the first additive delivery device of the first additive storage unit is in line connection and that the first additive storage via the first additive conveying device and the first additive line with the first mixing device in line s is connected. An even simpler and more environmentally friendly operation of the liquid mixing system can thus be achieved. The compressed air is provided at least for the admixture of compressed air to the liquid-foam mixture before the outlet and can additionally also serve for the operation and the admixing of the additive to the water.

Furthermore, it can be advantageous if the water pressure source is selected from the group of water storage with water pump, open water and water pump, hydrant, a water storage tank acted upon by a pressure medium. In this way, different water pressure sources can be used in the usual way. A combination of the water pressure sources with one another would also be possible and conceivable in order to be able to provide the liquid-foam mixture sufficiently for use.

Another embodiment is characterized in that the at least one water outlet of the water motor or the water turbine opens out into the open. This can be done if there is a sufficient amount of water available and there is no risk of excessive water damage in the surrounding areas.

Another possible embodiment has the features that the water pipeline network includes at least one first water return line, by means of which the first water return line the at least one water outlet of the water motor or the water turbine is in line connection with the water pressure source, in particular with its depressurized section. This means that an almost closed circuit for the water supply and return can be implemented. In addition, an even more economical operation of the liquid mixing system can be achieved in this way.

A further embodiment provides that a differential pressure control element and a measuring line are provided, which differential pressure control element is arranged in the second compressed air line and the measuring line is connected to the first water supply line starting from the differential pressure control element, and that the difference -Druckre gelungsorgan is designed to determine the prevailing water pressure in the first water supply line and based on the determined water pressure, the pressure level of the compressed air supplied to the additive delivery device can be adjusted. In this way, depending on the water pressure prevailing in the water supply line to the first mixing device, the Pressure level for the operation of the first additive storage unit with its first additive För dervorrichtung can be set exactly and / or regulated.

Another embodiment is characterized in that a second additive storage unit is provided with a second additive delivery device and a second additive storage for receiving a second additive and that the compressor is connected to the second additive delivery device via a third compressed air line and the second additive store is connected to the first mixing device in line s via the second additive delivery device and a second additive line. Depending on the additive used or required, the amount available can be increased and there are no change times and the associated downtimes. However, it can also be used to create the possibility of mixing or adding different additives to the water.

Another preferred embodiment is characterized in that the first mixing device is formed by a Venturi nozzle arrangement. In this way, a certain self-suction effect of the at least one additive can be achieved due to the water flow and the negative pressure built up in the process.

Furthermore, it can be advantageous if the second mixing device comprises an adjusting means, which adjusting means is designed to adjust the volume flow of the liquid-foam mixture fed to the second mixing chamber of the second mixing device. With the additional provision of the adjusting means, the subsequent process of adding compressed air can be set and predetermined even more precisely.

Another possible and possibly alternative embodiment has the features that the liquid mixing system is built on a base frame as a compact structural unit. A simple and safe transport option for the entire liquid mixing system can thus be created.

For a better understanding of the invention, it is explained in more detail with reference to the following figures.

They each show in a greatly simplified, schematic representation:

1 shows a circuit diagram of a possible design of a liquid mixing system; Fig. 2 shows the compact liquid mixing system, which is built on a Basisrah men, in a stylized, diagrammatic representation.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, whereby the disclosures contained in the entire description can be applied accordingly to the same parts with the same reference numerals or the same component names. The position details chosen in the description, e.g. above, below, side, etc., refer to the figure immediately described and shown and these position details are to be transferred accordingly to the new position in the event of a change in position.

The term “in particular” is understood below to mean that it can be a possible more specific design or more detailed specification of an object or a process step, but does not necessarily have to represent a mandatory, preferred embodiment of the same or a mandatory procedure. “Optional” is also used as a further term. This means that this process step or this system component is basically available, but can be used depending on the conditions of use, but this does not necessarily have to be done.

The term “liquid mixing system” is also used in the following. This is understood to mean that at least one additive can optionally be mixed into an extinguishing liquid, preferably water, by means of this system. As an additive, e.g. a foam agent or other additives or media can be mixed in or added. The so-called foaming number indicates the ratio between the volume of the water-foam compound mixture and the foam compound volume. It indicates how many times the amount of liquid has increased during foaming. The released liquid-foam mixture can be subdivided into a heavy foam, a middle foam and a light foam, depending on the foaming rate.

A prime mover is generally understood to be a machine that converts a form of energy, namely chemical, thermal or electrical energy, into mechanical work by executing a movement directed against a force. Power machines are mainly used to drive machines such as pumps, blowers, compressors and tools, as well as for vehicles. The prime movers are often also referred to as motors. In Fig. 1, an embodiment of a liquid mixing system 1 is shown in the form of a simplified circuit diagram or diagram. Provision is made, as far as possible, but preferably completely, to dispense with the use of prime movers for driving system components of the liquid mixing system 1. As already mentioned in the introduction, at least one additive can be added to the water normally used as an extinguishing agent before it is released in order to increase the extinguishing effect and / or to hinder or prevent the access of ambient air (oxygen) to the fire to be extinguished.

For the liquid mixing system 1, a component generally referred to as the water pressure source 2 is required, which provides the water and is formed out to dispense the water. It is also possible for several water pressure sources 2 to cooperate for the provision and delivery. The water pressure source 2 can be selected or formed from the group of water storage with water pump, open water and water pump, hydrant, a water storage charged with a pressure medium. For the sake of simplicity, the water pressure source 2 is shown schematically as a circle with a triangle inside. Depending on the type of water pressure source 2, the water can be given from this with a pressure value that comes from a pressure value range, the lower limit of which is 6 bar, preferably 9 bar, and the upper limit of which is 20 bar, in particular 12 bar, amounts to. Furthermore, the volume flow of the discharged water can originate from a volume flow value range whose lower limit is 400 l / min, preferably 500 l / min, and whose upper limit is 2,000 l / min, preferably 1,000 l / min. The higher the value of the volume flow is selected, the "wetter" the dispensed liquid-foam mixture becomes

Furthermore, the liquid mixing system 1 comprises a first additive storage unit 3 with a first additive 4 accommodated therein and intended for dispensing and admixing and / or admixing. An air compressor unit 5 is also provided, which is used to provide compressed air is designed or is used. The air compressor unit 5 in turn comprises a compressor 6 and a drive device 7 driving it, which is therefore connected to the compressor 6 in drive connection.

In order to be able to measure or add the first additive 4 to the water flow emitted by the water pressure source 2, there is also a first mixing device 8 with a first Mixing chamber 9 is provided. The first mixing device 8 can be formed, for example, by a Venturi nozzle arrangement.

A second mixing device 10 with a second mixing chamber 11 can preferably, but not necessarily, be provided. By means of the second mixing device 10, it is optionally also possible to be able to additionally admix or add compressed air to the liquid / foam mixture delivered by the first mixing device 8. If the second mixing device 10 is provided, a connecting line 12 connecting the two mixing devices 8, 10 is to be provided. It can furthermore be advantageous if the volume flow of the liquid-foam mixture fed to the second mixing chamber 11 of the second mixing device 10 is adjusted manually and / or pneumatically. For this purpose, the second mixing device 10 can comprise at least one adjusting means or at least one adjusting element 39, which is formed to adjust the volume flow of the liquid-foam mixture fed to the second mixing chamber 11 of the second mixing device 10. The adjusting means or the adjusting element 39 is indicated in a schematically simplified manner and can also be arranged within the second mixing device 10.

For the delivery of the liquid-foam mixture and the possible connection of hoses or lines to the liquid-mixing system 1, the latter also includes a delivery unit 13, which in turn comprises a connection device 14 and a delivery line 15. The delivery unit 13 is connected via the delivery line 15, if provided, to the second mixing device 10 and subsequently to the first mixing device 8. This optionally via the connecting line 12.

In order to be able to create or develop pipe connections between individual system components, separate pipe networks are also provided, depending on the medium to be passed through. Suitable pipes for each of the media, namely water, compressed air and the additive, are described below.

A water pipe network 16 comprises at least one first water supply line 17 which fluidically connects the water pressure source 2 to the first mixing device 8, where they are in pipe connection with one another.

An additive pipeline network 18 comprising a first additive line 19 is also provided. The first additive line 19 forms a line connection between the first additive Storage unit 3 and the first mixing device 8. In order to be able to direct the compressed air provided by the compressor 6 to the intended system component or to the intended system components, a compressed air line network 20 is also provided to include a first compressed air line 21. In the present exemplary embodiment, the first compressed air line 21 connects the compressor 6 to the second mixing device. By means of an actuating or regulating element 22, the amount of compressed air supplied to the second mixing device 10 or the compressed air volume flow can be regulated or adjusted. This can optionally be done in such a way that no compressed air at all is fed to the second mixing device 10 or the volume flow is increased depending on the desired air admixture. This is mostly done using a manual setting.

To drive the compressor 6, the drive device 7 described above is hen vorgese, which is formed in the present embodiment by a water motor or what serturbine. The water motor or the water turbine each has at least one water inlet 23 and at least one water outlet 24. To supply the water motor or the water turbine, a second water supply line 25 is provided, which in turn connects the water supply 23 to the water pressure source 2 in terms of flow. To adjust the volume flow, a further adjusting or regulating element 26 can be provided, which is designed as a ball valve, for example. In this way, the water supply both to the first mixing device 8 and to the water inlet 23 of the water motor or the water turbine can be released or prevented.

If the water under pressure is now fed to the water motor or the water turbine, the water motor or the water turbine subsequently drives the compressor 6, which provides the compressed air. In this case, the water, which is mostly available under pressure, can also serve as a drive medium for the water motor or the water turbine and the compressed air can be used at least for the optional operation of the second mixing device 10.

If the pressurized water is now fed from the water pressure source 2 via the first water supply line 17 to the first mixing device 8, at least the first additive 4 can optionally also be supplied from the first additive storage unit 3 to the first mixing device 8 and in this with mixed with the water or added to the water. The liquid-foam mixture is then passed on to the dispensing unit 13 and on this to a subsequently connected to it, for example by means of an extinguishing line, jet pipe 27 for the extinguishing operation, which can also be referred to as an extinguishing pistol or extinguishing lance.

It can also be advantageous if the compressed air provided by the compressor 6 is also used to convey the first additive 4 from the first additive storage unit 3 to the first mixing device 8. The first additive storage unit 3 comprises a first additive delivery device 28 and a first additive storage 29 for receiving and storing the first additive 4. The first additive delivery device 28 can be formed, for example, by a delivery pump driven by compressed air. To supply the compressed air, the compressed air pipeline network 20 comprises a second compressed air line 30 which fluidically connects the compressor 6 to the first additive delivery device 28.

The first additive store 29 is in line with the first mixing device 8 via the first additive delivery device 28 and the first additive line 19. When the first additive storage unit 3 is in operation, the first additive delivery device 28 is driven by the compressed air supplied in the second compressed air line 30 and the first additive 4 is removed from the first additive memory 29 and via the first additive line 19 to the first mixing device 8 funded. The removal can take place, for example, in a suction process.

At least one differential pressure regulating element 31 can also be provided, which is arranged in the second compressed air line 30 in the exemplary embodiment shown. The differential pressure regulating element 31 is in turn connected via a measuring line 45 to the first water supply line 17 in a line connection and / or in communication connection. The measuring line 45 can also be referred to as a reference pressure line, by means of which the internal pressure (water pressure) currently prevailing in the first water supply line 17 is transmitted to the differential pressure control element 31. If the pressure control element 40, described in more detail below, is provided in the water supply line 17 for setting and controlling the water supplied or supplied to the first mixing device 8 from the water pressure source 2, the pressure prevailing downstream from the pressure control element 40 is determined and used to control the air pressure passed on in the second compressed air line 30 to the first additive conveying device 28. The differential pressure control element 31 is designed to determine the water pressure prevailing in the first water supply line 17, the pressure level of the compressed air supplied to the additive delivery device 28 from the differential pressure control element 31 in the downstream to the first additive delivery device 28 being based on the determined water pressure second compressed air line 30 is set. Thus, depending on the pressure of the water in the first water supply line 17, that pressure of the compressed air in the second compressed air line 30, which is passed on to the first additive conveying device 28, can be set by the differential pressure regulating member 31.

In addition, a second additive storage unit 32 can also be provided, which comprises a second additive delivery device 33 and a second additive storage 34. A second additive 35 is received or stored in the second additive store 34. The second additive delivery device 33 can be in line connection with the compressor 6 by means of a third compressed air line 36. It can be provided for regulating and setting the pressure of the compressed air another, not shown and designated differential pressure control element, which can be designed analogously to the previously described differential pressure control element 31 in the second compressed air line 30. This possible additional Differential pressure regulating element can be arranged in the third compressed air line 36, which is only shown in sections for reasons of clarity, between the two “I” in a circle, which represent a line connection.

The second additive store 34 is connected to the first mixing device 8 via the second additive delivery device 33 and a second additive line 37. The second additive delivery device 33 is driven with the compressed air provided by the compressor 6, the second additive 35 being removed from the second additive storage 34 and delivered to the first mixing device 8 by means of the second additive delivery device 33 via the second additive line 37. The additive delivery devices 28, 33 described above can be formed, for example, by compressed air diaphragm pumps or the like.

However, it would also be possible to provide the second additive storage unit 32, but to provide a different type of drive. However, the same also applies to the first additive storage unit 3 described above. The additive or additives can also be referred to as additives. Depending on the requirements and conditions of use, the additive or the admixture can be selected from the group of solid granules, abrasives, extinguishing powder, extinguishing additives, foaming agents, dry ice, decontaminants or the like.

That water motor or the water turbine required and supplied for the drive can be passed abge after the drive and exiting the water drain 24 into the open. Regardless of this, however, it would also be possible to provide at least one water return line 38 in the water supply network 16. The water return line 38 forms a fluidic connection between the water outlet 24 of the water motor or the water turbine and the water pressure source 2 Section, are passed back and then ßend again delivered to the water motor or the water turbine. That water pressure of the water which is present at the first mixing device 8 and is flowing through it can be set and regulated by means of a pressure regulating element 40. In most cases, this is done with manual adjustment by a designated or trained operator.

As described above, at least one additive 4, 35 can be mixed or added to the water or extinguishing water. In order to be able to pre-set the admixing rate for the respective additive 4, 35, a separate setting element 41 can be arranged or provided in the first additive line 19 and / or also in the second additive line 37, as indicated. The two previously described additive delivery devices 28, 33 who are preferably operated with the compressed air provided by the compressor 6, although this does not necessarily have to be done.

The admixing and transport of the at least one additive 4, 35 from its respective additive storage unit 3, 32 does not necessarily have to take place with one of the previously described additive conveying devices 28, 33, but can also be carried out with other devices or system components. A prime mover or the like could also be used for this purpose, but should be avoided for environmental reasons.

To also the pressure with which the air compressed by the compressor 6 is supplied in the first compressed air line 21 of the second mixing device 10, to the respective in the First water supply line 17 to be able to adjust the currently prevailing water pressure, a separate or additional differential pressure control element 46 can be arranged or provided in the first compressed air line 21 between the control element 22 and the second mixing device 10. The measuring line 45 required for this can be branched off from the first measuring line 45 described above. The further differential pressure regulating element 46 is also in communication or flow connection with the first water supply line 17 via the measuring line 45.

In FIG. 2, the liquid mixing system 1 is shown in a stylized form in the form of a box-shaped structure, which is constructed as a compact structural unit on a base frame 42 and is fastened to it. A coupling device 43 is provided for connecting the water pressure source 2, with the water return line 38 ending at a further coupling device 44. Furthermore, the control element 26, which can also be referred to as an actuator, can be seen, which adjusts or regulates the water flow to the previously described system components located below. This compactly built-up liquid mixing system 1 can preferably also be designed or referred to as a mobile and therefore easy-to-transport insert unit.

The method is used to provide a liquid-foam mixture by mixing water with at least one additive 4, 35 by means of the liquid mixing system 1, in which the following steps are carried out:

Provision of the water pressure source 2 for the delivery of the water,

Providing at least one first additive storage unit 3 with the first additive 4 received therein,

Providing the air compressor unit 5 for providing compressed air, comprising the compressor 6 and the drive device 7, the drive device 7 being in drive connection with the compressor 6,

Providing the first mixing device 8 with the first mixing chamber 9 for admixing at least the first additive 4 to the water emitted by the water pressure source 2,

Provision of the second mixing device 10 with a second mixing chamber 11 for the optional admixing of compressed air to the liquid-foam mixture given by the first mixing device 8, and a connecting line 12 connecting the two mixing devices 8, 10 to one another, Providing the dispensing unit 13 for dispensing the liquid-foam mixture with the connecting device 14 and the dispensing line 15, by means of which the dispensing line 15 connects the connecting device 14 with the mixing devices 8, 10,

Provision of the water line network 16 with at least one first water supply line 17, by means of which the first water supply line 17 the first mixing device 8 is in line connection with the water pressure source 2,

Provision of the additive line network 18 with at least one first additive line 19, by means of which first additive line 19 the first additive storage unit 3 is in line connection with the first mixing device 8,

Provision of the compressed air line network 20 with the first compressed air line 21, by means of which the first compressed air line 21 the second mixing device 10 is optionally in line connection with the compressor 6,

Feeding the water from the water pressure source 2 to the first mixing device 8 via the first water feed line 17,

Feeding at least the first additive 4 from the first additive storage unit 3 to the first mixing device 8 via the first additive line 19,

Mixing the water with the at least one additive 4 by means of the first mixing device 8 and forwarding the liquid-foam mixture to the dispensing unit 13 and dispensing the liquid-foam mixture from the connection device 14, it being further provided that the drive device 7 of the air compressor -Unit 5 is formed by a water motor or a water turbine comprising at least the water inlet 23 and at least the water outlet 24, that the second water inlet 25 is provided and the at least one water inlet 23 of the water motor or the water turbine via the second water inlet 25 with the water Dm ckquelle 2 is in line connection, and that the water from the water pressure source 2 is fed to the water motor or the water turbine via the second water supply line 25 and the water motor or the water turbine is driven by the water under pressure. The exemplary embodiments show possible design variants, whereby it should be noted at this point that the invention is not limited to the specifically shown design variants dersel ben, but rather various combinations of the individual design variants with one another are possible and this possible variation is based on the teaching on technical action The present invention is within the ability of a person skilled in the art who is active in this technical field.

The scope of protection is determined by the claims. However, the description and the drawings are to be used to interpret the claims. Individual features or combinations of features from the various exemplary embodiments shown and described can represent independent inventive solutions for themselves. The task on which the independent inventive solutions are based can be found in the description.

All information on value ranges in the present description are to be understood in such a way that they include any and all sub-areas, e.g. the information 1 to 10 should be understood to include all sub-areas, starting from the lower limit 1 and the upper limit 10 are, ie all sub-ranges begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, for example 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

For the sake of clarity, it should finally be pointed out that, for a better understanding of the structure, some elements have been shown not to scale and / or enlarged and / or reduced.

List of reference symbols

30 second compressed air line liquid mixing system

31 Differential pressure regulator water pressure source

32 second additive storage unit, first additive storage unit

33 second additive delivery device, first additive

34 second additive storage air compressor unit

35 second additive compressor

36 third compressed air line drive device

37 second additive line, first mixing device

38 Water return first mixing chamber

39 actuator second mixing device

40 pressure regulator second mixing chamber

41 Connecting line adjusting device

42 Base frame delivery unit

43 Coupling s Device Connection device

44 Coupling s device delivery line

45 Measuring line for the water supply network

46 differential pressure control element first water supply line additive line network first additive line compressed air line network first compressed air line control element water inlet water outlet water supply line control element jet pipe first additive delivery device first additive storage

Claims

Patent claims

1. A method for providing a liquid-foam mixture by mixing water with at least one additive (4, 35) by means of a liquid mixing system (1), in which the following steps are carried out:

Providing a water pressure source (2) to deliver the water,

Providing at least one first additive storage unit (3) with a first additive (4) received therein,

Providing an air compressor unit (5) for providing compressed air, comprising a compressor (6) and a drive device (7), the drive device (7) being in drive connection with the compressor (6),

Providing a first mixing device (8) with a first mixing chamber (9) for adding at least the first additive (4) to the water dispensed by the water pressure source (2),

Provision of a second mixing device (10) with a second mixing chamber (11) for the optional admixing of compressed air to the liquid-foam mixture delivered by the first mixing device (8), and a connecting line (12) connecting the two mixing devices (8, 10) to one another ,

Providing a dispensing unit (13) for dispensing the liquid-foam mixture with a connecting device (14) and a dispensing line (15), by means of which the dispensing line (15) the connecting device (14) is in line connection with the mixing devices (8, 10),

Providing a water line network (16) with at least one first water supply line (17), by means of which the first water supply line (17) the first mixing device (8) is connected to the water pressure source (2) in line s,

Providing an additive line network (18) with at least one first additive line (19), by means of which first additive line (19) the first additive storage unit (3) is connected to the first mixing device (8) in line s,

Providing a compressed air line network (20) with a first compressed air line (21), by means of which the first compressed air line (21) the second mixing device (10) is optionally in line connection with the compressor (6),

Feeding the water from the water pressure source (2) to the first Mischvorrich device (8) via the first water supply line (17), Supplying at least the first additive (4) from the first additive storage unit (3) to the first mixing device (8) via the first additive line (19),

Mixing of the water with the at least one additive (4) by means of the first mixing device (8) and forwarding of the liquid-foam mixture released to the dispensing unit (13) from the connection device (14), characterized in that the drive device (7) the air compressor unit (5) is formed by a water motor or a water turbine comprising at least one water inlet (23) and at least one water outlet (24) that a second water inlet (25) is provided and the at least one water inlet (23) of the The water motor or the water turbine is connected to the water pressure source (2) via the second water supply line (25) so that the water from the water pressure source (2) is fed to the water motor or the water turbine via the second water supply line (25) and the water motor or the water turbine is driven by the pressurized water. (3)

2. The method according to claim 1, characterized in that a first additive För dervorrichtung (28), in particular a feed pump driven by compressed air, for the first additive storage unit (3) and a second compressed air line (30) are provided, by means of which the second Compressed air line (30) of the compressor (6) with the first additive För dervorrichtung (28) of the first additive storage unit (29) is in line connection, and the first additive delivery device (28) of the first additive storage unit (3) of the compressed air supplied in the second compressed air line (30) is driven and the first additive (4) is removed from a first additive memory (29) and fed to the first mixing device (8) via the first additive line (19).

3. The method according to claim 1 or 2, characterized in that the water of the water pressure source (2) is taken from a water storage tank with a water pump, a free body of water by means of a water pump, a hydrant and / or a water storage tank loaded with a pressure medium.

4. The method according to any one of the preceding claims, characterized in that the water emerging from the at least one water drain (24) of the water motor or the water turbine is diverted into the open air.

5. The method according to any one of claims 1 to 3, characterized in that at least one water return line (38) is provided and the water emerging from the at least one water drain (24) of the water motor or the water turbine via the water return line (38) to the water - Pressure source (2), in particular in the pressureless section, is passed back and is released from this again to the water motor or the water turbine.

6. The method according to any one of claims 2 to 5, characterized in that a differential pressure control element (31) is arranged in the second compressed air line (30), from which differential pressure control element (31) in the first water supply line (17) prevail The water pressure is determined and the pressure level of the compressed air supplied to the additive delivery device (28) is set on the basis of the determined water pressure.

7. The method according to any one of the preceding claims, characterized in that a second additive storage unit (32) with a second additive conveying device (33) and a second additive memory (34) with a second additive (35) received therein is provided and via a third compressed air line (36) the compressed air from the compressor (6) of the second additive delivery device (33) is fed and driven and the second additive (35) is removed from the second additive storage (34) and via a second Additive line (37) of the first mixing device (8) is fed.

8. The method according to any one of the preceding claims, characterized in that the volume flow of the second mixing chamber (11) of the second mixing device (10) supplied liquid-foam mixture is adjusted manually and / or pneumatically.

9. The method according to any one of the preceding claims, characterized in that the water from the water pressure source (2) is delivered with a pressure value that originates from a pressure value range whose lower limit is 6 bar, preferably 9 bar, and whose upper limit is 20 bar, in particular 12 bar.

10. The method according to any one of the preceding claims, characterized in that the water motor or the water turbine is supplied with a volume flow that comes from a volume flow value range whose lower limit is 4001 / min, preferably 5001 / min, and its upper limit Limit is 2,000 l / min, preferably 1,000 l / min.

11. Liquid mixing system (1) for providing a liquid-Schaumgemi cal, which is formed by mixing water with at least one additive (4), in particular for performing the method according to one of the preceding claims, comprising the liquid-mixing system (1) a water pressure source (2), which water pressure source (2) is designed to dispense the water, at least one first additive storage unit (3), which first additive storage unit (3) is designed to receive a first additive (4) is, an air compressor unit (5) comprising a compressor (6) and a drive device (7), wherein the drive device (7) is in drive connection with the compressor (6), and wherein the air compressor unit (5) is designed to provide compressed air, a first mixing device (8) with a first mixing chamber (9), the first mixing device (8) for adding at least the first additive (4) to that of the water pressure source le (2) dispensed water is formed, a second mixing device (10) with a second mixing chamber (11), which second mixing device (10) is designed for the optional admixing of compressed air to the liquid-foam mixture dispensed by the first mixing device (8) , and a connecting line (12) connecting the two mixing devices (8) to one another, a delivery unit (13) with a connection device (14) and a delivery line (15), by means of which delivery line (15) the connection device (14) is connected to the mixing devices ( 8, 10) is in line s connection, wherein the dispensing unit (13) is designed to dispense the liquid-foam mixture, a water line network (16) with at least one first water supply line (17), by means of which the first water supply line (17) the first Mixing device (8) with the water Pressure source (2) is in line connection, an additive line network (18) with at least one first additive line (19), with means of which first additive line (19) the first additive storage unit (3) with the first mixing device (8) in line s Connection is a compressed air line network (20) with a first compressed air line (21), by means of which the first compressed air line (21) the second mixing device (10) is optionally connected to the compressor (6) in line s, characterized in that the drive Device (7) of the air compressor unit (5) is formed by a water motor or a water turbine comprising at least one water inlet (23) and at least one water outlet (24), that a second water supply line (25) is provided, that the at least one Water supply (23) of the water motor or the water turbine via the second water supply line (25) with the water pressure source (2) in line s is connected.

12. Liquid mixing system (1) according to claim 11, characterized in that a first additive delivery device (28), in particular a delivery pump that can be driven by compressed air, a first additive storage unit (29) in the first additive storage unit (3) for receiving the first additive (4) and a second compressed air line (30) are provided, by means of which the second compressed air line (30) connects the compressor (6) with the first additive delivery device (28) of the first additive storage unit (3 ) is in conduction connection and that the first additive store (29) is in conduction connection with the first mixing device (8) via the first additive conveying device (28) and the first additive line (19).

13. Liquid mixing system (1) according to claim 11 or 12, characterized in that the water pressure source (2) is selected from the group of water storage with water pump, free water and water pump, hydrant, a pressurized water storage tank.

14. Liquid mixing system (1) according to one of claims 11 to 13, characterized in that the at least one water drain (24) of the water motor or the What serturbine opens into the open.

15. Liquid mixing system (1) according to one of claims 11 to 13, characterized in that the water supply network (16) comprises at least one first water return line (38), by means of which first water return line (38) the at least one water drain (24 ) of the water motor or the water turbine is in line connection with the water pressure source (2), in particular with its non-pressurized section.

16. Liquid mixing system (1) according to one of claims 12 to 15, characterized in that a differential pressure control element (31) and a measuring line (45) are provided, which differential pressure control element (31) in the second compressed air line ( 30) is arranged and the measuring line (45) starting from the differential pressure control element (31) is connected to the first water supply line (17) in line s, and that the differential pressure control element (31) for determining the in the first water supply line (17 ) the water pressure prevails and the pressure level of the compressed air supplied to the additive delivery device (28) can be set on the basis of the determined water pressure.

17. Liquid mixing system (1) according to one of claims 11 to 16, characterized in that a second additive storage unit (32) with a second additive För dervorrichtung (33) and a second additive memory (34) for receiving a second additive (35) is provided and that the compressor (6) is connected to the second additive delivery device (33) via a third compressed air line (36) and the second additive store (34) is connected via the second additive Conveying device (33) and a second additive line (37) is in line connection with the first mixing device (8).

18. Liquid mixing system (1) according to one of claims 11 to 17, characterized in that the first mixing device (8) is gebil det by a Venturi nozzle arrangement.

19. Liquid mixing system (1) according to one of claims 11 to 18, characterized in that the second mixing device (10) comprises an actuator (39), which actuator (39) for adjusting the volume flow of the second mixing chamber (11) the second mixing device (10) supplied liquid-foam mixture is formed.

20. Liquid mixing system (1) according to one of claims 11 to 19, characterized in that it is constructed as a compact structural unit on a base frame (42).