EP1259296A1 - Chambre de melange destinee a la production de mousse a air comprime pour des installations d'extinction - Google Patents

Chambre de melange destinee a la production de mousse a air comprime pour des installations d'extinction

Info

Publication number
EP1259296A1
EP1259296A1 EP01915056A EP01915056A EP1259296A1 EP 1259296 A1 EP1259296 A1 EP 1259296A1 EP 01915056 A EP01915056 A EP 01915056A EP 01915056 A EP01915056 A EP 01915056A EP 1259296 A1 EP1259296 A1 EP 1259296A1
Authority
EP
European Patent Office
Prior art keywords
compressed air
mixing chamber
extinguishing agent
foam
extinguishing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01915056A
Other languages
German (de)
English (en)
Other versions
EP1259296B1 (fr
Inventor
Ulrich Braun
Helmut Andris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1259296A1 publication Critical patent/EP1259296A1/fr
Application granted granted Critical
Publication of EP1259296B1 publication Critical patent/EP1259296B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C5/00—Making of fire-extinguishing materials immediately before use
    • A62C5/02—Making of fire-extinguishing materials immediately before use of foam

Definitions

  • the invention relates to a mixing chamber for generating
  • Compressed air foam for fire fighting systems with a compressed air inlet, an extinguishing agent inlet and a compressed air foam outlet.
  • Extinguishing foam is used in the fire-fighting of flammable liquid and solid substances.
  • a mixture of water and a foaming agent is prepared using compressed air.
  • Different systems are known from the prior art.
  • a mixture of water and foaming agent can be conveyed by a centrifugal pump through a foam jet pipe, the foam being generated directly on the foam jet pipe by admixing the ambient air with vacuum.
  • From the U.S. -Patentschrift 5,255,747 it is known to provide a compressed air admixture instead of admixing the ambient air by means of negative pressure.
  • the amount of air required for foaming is supplied via a compressed air compressor. This significantly improves the foam quality, significantly exceeds the water halftime required by DIN 14272 and increases the throw of the extinguishing agent jet generated with compressed air foam.
  • the device has the disadvantage that a motor-driven centrifugal pump and a compressed air compressor have to be provided.
  • an extinguishing device in which the compressed air foam without mechanical conveyance, for example by a Centrifugal pump is promoted.
  • a compressed air stream provided from a compressed air source is divided, one part being directed into an extinguishing agent container and another part into a mixing chamber.
  • the extinguishing agent container contains the mixture of water and extinguishing agent, which is conveyed into the mixing chamber by the compressed air partial flow.
  • the admixture of the second compressed air stream causes the foaming agent to mix with the water to form extinguishing foam.
  • the object of the invention is to provide a mixing chamber for the production of compressed air foam for fire fighting systems, in which an optimal foam quality can be provided particularly efficiently.
  • a mixing chamber for generating compressed air foam for fire fighting systems for fire fighting with a Drucklu teinlass, a Löschscheinlass and a compressed air foam outlet, in which the mixing chamber has a tapering towards the compressed air foam outlet inner contour.
  • the extinguishing agent which preferably consists of a foaming agent and water, enters the pressure chamber through the extinguishing agent inlet.
  • Compressed air provided by a compressed air source enters the mixing chamber through the compressed air inlet.
  • the mixture of water and foaming agent foams in the mixing chamber due to the compressed air supply and emerges as extinguishing foam from the compressed air foam outlet.
  • the foaming is due to the tapering towards the compressed air foam outlet Inner contour particularly efficient.
  • the design according to the invention of the inner contour of the mixing chamber causes an intensive swirling, in particular a rotation, which promotes the mixing process.
  • the quality of the extinguishing foam produced according to the invention is comparable to that of foam which is produced by large-scale systems which produce compressed air foam with a water volume fraction of more than 1,000 1 / min using complex measurement and control technology.
  • the compressed air storage containers can be selected to be very small, or existing compressed air generation systems can be used that are provided for mobile or stationary use for other purposes.
  • the inner contour of the mixing chamber is essentially conical, the compressed air inlet and the extinguishing agent inlet open into the bottom of the conical inner contour and the compressed air foam outlet is arranged in the region of the tip of the conical inner contour.
  • the compressed air inlet and the extinguishing agent inlet preferably open into the mixing chamber essentially parallel to one another.
  • the lines for the compressed air flowing into the mixing chamber and for the extinguishing agent run parallel to one another, at least immediately before entering the mixing chamber.
  • Extinguishing agent inlet or the corresponding extinguishing agent lines is preferably 1: 3.
  • the inside diameter of the compressed air foam outlet is preferably equal to the inside diameter of the extinguishing agent inlet.
  • the mixing chamber is preferably made of materials such as plastic, brass or aluminum, i.e. made of materials that are corrosion-resistant to the foam agent used.
  • a foam controller is provided behind the compressed air foam outlet, which serves to selectively provide a disturbing body in the free cross section of the compressed air foam outlet.
  • the foam quality can be influenced by means of the foaming regulator.
  • a foaming regulator For fighting full fires, i.e. when the entire surface of a flammable substance burns, a high proportion of water in the foam is required. Evaporation of the water removes energy from the combustion reaction. After the extinguishing effect has occurred, i.e. after the flames have collapsed, post-extinguishing work is required. This requires a fine-pored, cream-like foam with a low water content.
  • Such a dry foam has a high water half-life and promotes the wetting of carbon surfaces.
  • the lower proportion of water in the foam also increases the service life of the extinguishing agent container. Extinguishing agents can be dispensed at least twice as long and up to five times as long compared to wet foam.
  • the foam controller according to this preferred embodiment of the invention thus enables easy influencing of the foam quality. If the foam regulator is in the position in which the compressed air foam outlet is fully open, the result is a relatively wet foam with a relatively high proportion of water, which enables a long throw and is particularly suitable for advanced, intensive fires. If, for example after the extinguishing effect has taken place and to carry out post-extinguishing work, an interfering body is pushed into the free cross-section of the air pressure foam outlet by actuating the foaming controller, a dry foam with a lower water content results. The throwing distance is reduced as a result, but the longer life of the foam results in an increased penetration effect.
  • the penetration through the extinguishing water prevents re-ignition of burnt solid substances and also inhibits the flammability of unburned substances.
  • the increased operating time of the extinguishing device due to the lower water content is particularly important for the more complex extinguishing work compared to fighting full fires.
  • the foam controller according to the invention can be used in any mixing chamber.
  • the interfering body is preferably a blocking element with a multiplicity of separate passage passages.
  • the interfering body is preferably a blocking element with a multiplicity of separate passage passages.
  • Interference body made of sintered metal.
  • Sintered metal is particularly suitable for producing homogeneous
  • the design of the mixing chamber according to the invention enables a space and weight-optimized fire extinguishing device which does not require a mechanical conveying device and in particular can be designed as a retrofittable solution for various applications. Possible uses include trucks, ships and submarines, as well as workshops and businesses. Fires often occur in transport vehicles, which in particular have a considerable risk potential if these fires occur in tunnels. Known small fire extinguishers carried on the vehicle, which are predominantly powder extinguishers, are not able to extinguish an advanced damage fire.
  • the fire extinguishing device according to the invention it is also possible to control fires that have already passed the stage of origin.
  • Trucks are equipped with compressed air braking systems.
  • the compressed air compressors of vehicles with a permissible total weight of 16,000 kg, for example, are sufficiently powerful to operate a mixing chamber of the type in question here.
  • Other areas of application are the transportation of dangerous goods, particularly when driving in tunnels, military convoys and armored vehicles.
  • Vehicles and work machines from the construction industry, agriculture and mining can also be protected more efficiently with the fire extinguishing device according to the invention, provided that these vehicles and work machines have sufficiently powerful compressed air compressors.
  • compressed air controls and pneumatic tools are also used in most commercial operations.
  • the compressed air compressor systems usually used are adequately dimensioned with regard to the air volume capacity for the fire extinguishing device according to the invention.
  • fire protection with the fire extinguishing device according to the invention is possible in a simple manner.
  • the fire extinguishing device has a small installation size, can be retrofitted at any time and is easy to assemble, is only light in weight, since only the extinguishing agent supply must be present, but not a separate compressed air reservoir, is much more effective than normal water, especially in the case of plastic and liquid fires , and also avoids water damage.
  • Fig. 1 is a schematic representation of an embodiment of an inventive
  • FIG. 2 is a schematic perspective view of a first embodiment of a mixing chamber according to the invention with a foam controller
  • 3 is a sectional view of a second embodiment of the mixing chamber according to the invention with a foam regulator
  • FIG. 3a shows a sectional view of a third embodiment of the mixing chamber according to the invention
  • Fig. 4 is a sectional view taken along line A-A in Fig. 2 and
  • Fig. 5 is a schematic representation of an extinguishing device for retrofitting stationary installation in a truck.
  • the extinguishing agent container 1 schematically shows a fire extinguishing device with an extinguishing agent container 1, a mixing chamber 10 and a lockable jet pipe 20.
  • the extinguishing agent container 1 is designed to hold water and a foam agent.
  • the extinguishing agent container 1 is connected to the mixing chamber 10 via an extinguishing agent line 2.
  • the extinguishing agent line 2 consists of a commercially available, dimensionally stable pressure hose and communicates with the inside of the mixing chamber 10 via an extinguishing agent inlet 11.
  • a riser pipe (not shown) provided in the extinguishing agent container 1 should preferably have the same inside diameter as the extinguishing agent line 2, which in turn is preferably the same Has the inside diameter like the extinguishing agent inlet 11.
  • the compressed air lines 31 and 32 can be commercially available, preferably dimensionally stable, pressure lines which are provided with commercially available quick coupling connections.
  • the first compressed air line 31 communicates with the inside of the mixing chamber 10 via a compressed air inlet 12.
  • the inside diameter of the compressed air line 31 should preferably be equal to the inside diameter of the compressed air line 32.
  • the jet pipe 20 which may have a shut-off device and is preferably smooth on the inside, since additional interfering bodies would destroy the foam bubble structures again at this point, is connected to the mixing chamber via a conventional hose line 33.
  • the hose line 33 communicates with the mixing chamber via a compressed air foam outlet 13.
  • a first embodiment of the mixing chamber 10 is shown schematically in FIG. 2 in a perspective, partially cut-open representation.
  • the inner contour is hemispherical, the extinguishing agent inlet 11 and the compressed air inlet 12 being arranged on the flat side of the hemisphere and the compressed air foam outlet 13 opposite the flat side of the hemisphere at its zenith.
  • a foam controller 40 is integrally formed with the mixing chamber 10.
  • the direction of flow of the extinguishing agent consisting of water and foam agent in the extinguishing agent line 2 and the extinguishing foam in the hose line 33 are indicated in FIG. 1 by arrows.
  • a Umsehaltelement 41 of the foaming controller 40 is displaceable perpendicular to the flow direction of the extinguishing foam.
  • 3 shows a section of another embodiment of the mixing chamber 10.
  • the inner contour of the mixing chamber is designed in a conical shape, the extinguishing agent inlet 11 and the compressed air inlet 12 being arranged on the blunt cone side and the compressed air foam outlet 13 on the cone tip.
  • the extinguishing agent inlet 11 is directly opposite the compressed air foam outlet 13.
  • the diameter of the compressed air foam outlet 13 is equal to the diameter of the extinguishing agent inlet 11.
  • the compressed air inlet 12 and the extinguishing agent inlet 11 or the corresponding line sections arranged directly in front of them run parallel to one another.
  • the diameter of the extinguishing agent inlet 11 is three times the diameter of the compressed air inlet 12.
  • the diameter of the extinguishing agent line 2 and of the extinguishing agent inlet 11 is 6 mm
  • the diameter of the first compressed air line 31 and the compressed air inlet 12 is 2 mm.
  • an inner diameter of 12 mm for the extinguishing agent line 2 and the extinguishing agent inlet 11 and 4 mm for the first compressed air line 31 and the compressed air inlet 12 have proven to be suitable.
  • FIG 3 also shows the switching element 41 of the foaming controller 40.
  • FIG. 4 shows a sectional view through the foam controller 40 and the switching element 41.
  • the cross section of the compressed air foam outlet is completely released.
  • a relatively wet foam is generated when the fire extinguishing device is in operation, which has a long throw due to its relatively high water content and is particularly suitable for advanced, intensive fires.
  • a disturbing body 42 enters the free cross section of the compressed air foam outlet.
  • a relatively dry foam with a lower water content is generated during operation of the fire extinguishing device, which is more expedient for post-extinguishing work.
  • the interference body 42 is preferably made of sintered metal.
  • the switching element 41 is mounted in a correspondingly designed bore of the foaming regulator 40 and can be displaced perpendicular to the flow direction of the extinguishing foam, it being able to assume the two aforementioned positions.
  • a connection device is connected to the compressed air source 30.
  • a partial flow of the compressed air provided by the compressed air source 30 flows into the extinguishing agent container 1 and presses the extinguishing agent consisting of water and a foam agent through the extinguishing agent line 2 and the extinguishing agent inlet 11 into the mixing chamber 10.
  • the remaining partial flow of the compressed air source 30 flows through the first compressed air line 31 and the compressed air inlet 12 into the mixing chamber 10 and, particularly as a result of a rotational movement, causes an intensive swirling of the extinguishing agent, which leads to foam formation.
  • the foamed extinguishing agent emerges from the mixing chamber as extinguishing foam through the compressed air foam outlet 13.
  • the inside diameter of the extinguishing agent line 2 and the compressed air foam outlet 13 was 12 mm and the diameter of the first compressed air line 31 and the compressed air inlet 12 was 4 mm, with one Hose line of 10 m in length and a throwing distance of approx. 12 m can be achieved.
  • the water content in the case of a wet foam was approximately 30 1 / min.
  • the throw could be increased to approx. 16 m with a water content of 25 1 / min.
  • an extinguishing gun for a truck extinguishing system which is available from Karasto Armaturenfabrik, Oehler GmbH, 70734 Fellbach, Germany, under the name "pouring spray 521 PL SB G 3/4 inch with full jet nozzle 520 S AG G 3 / 4 inches "can be obtained.
  • the size of the bores and the pressure conditions determine the volume throughput.
  • the compressed air supply When using a compressed air tank, the compressed air supply must be dimensioned so that it is sufficient for the discharge of the entire extinguishing agent supply.
  • the compressed air generation system it can be assumed that sufficient compressed air can be continuously provided.
  • the air volume flow can be approx. 6 l / sec at 8 to 10 bar pressure. In smaller systems, a lower air volume flow is possible at the same pressures.
  • the operation of the extinguishing device explained above is particularly suitable for fighting full fires.
  • the changeover element 4 1 is shifted in the foam controller 40 in such a way that the interference element 42 enters the line cross section behind the compressed air foam outlet 13.
  • a fine-pored, cream-like foam with low water content is generated.
  • the operating time of the fire extinguishing device is extended due to the low water content. Compared to the position for wet foam, the time for dispensing extinguishing agent can be at least doubled and possibly quintupled in the position for dry foam.
  • FIG 3a shows a sectional view of an embodiment of the mixing chamber according to the invention with a foam regulator and an integrated distribution of the compressed air volume flow.
  • a foam regulator and an integrated distribution of the compressed air volume flow.
  • the total mass of a portable fire extinguisher is limited for reasons of manageability. In Europe, for example, the requirements of the EN 3 standard for portable fire extinguishers must be observed, according to which the total mass of a portable fire extinguisher is limited to 20 kg.
  • the extinguishing agent content of a foam extinguisher is limited to a maximum of 9 liters. With portable fire extinguishers, both the construction volume and the total mass are to be kept as low as possible.
  • the embodiment of the mixing chamber according to the invention shown in FIG. 3a can be placed in the form of a corresponding component on a commercially available foam extinguisher such that the filling opening of the foam extinguisher is closed off by the mixing chamber or the component having the mixing chamber.
  • the division of the compressed air volume flow is integrated into a first partial flow into the interior of the mixing chamber and a second partial flow into the extinguishing agent container 1 into the mixing chamber 10 or the component having the mixing chamber.
  • a compressed air line 31 which can be connected to a compressed air source 30 (see FIG.
  • the compressed air flow is divided into a first part, which is connected to the compressed air inlet 12, and a second part, which communicates via the compressed air line 32 with the filling opening of the foam extinguisher.
  • the inner diameter of the compressed air line denoted by reference numeral 32 in FIG. 3 a is preferably equal to the diameter of the compressed air inlet 12.
  • the required compressed air can be provided, for example, with a compressed air bottle with a volume of one liter and a filling pressure of 200 bar.
  • a compressed air bottle with a volume of one liter and a filling pressure of 200 bar.
  • an operating time of 40 seconds with a throwing distance of 10 m can be provided in wet mode. In dry mode, the operating time is 80 seconds.
  • FIG. 5 shows a schematic representation of an extinguishing device for subsequent stationary installation in a truck using the mixing chamber 10 according to the invention.
  • the extinguishing device shown in FIG. 5 provides an effective fire-fighting agent which is also suitable for retrofitting.
  • a commercially available extinguishing agent container 1 is mounted at a suitable point on the truck, for example in the undercarriage (not shown).
  • the content of this extinguishing agent container should preferably be at least 40 liters.
  • a compressed air bottle 43 with a volume of 4 liters and a filling pressure of 200 bar is provided as the compressed air source 30.
  • the mixing chamber 10 according to the invention or the component having the mixing chamber is mounted directly on the extinguishing agent container 1.
  • the compressed air line 43 coming from the compressed air bottle is divided so that compressed air is fed into the mixing chamber 10 via the compressed air line 31 and compressed air is fed into the extinguishing agent container 1 via the compressed air line 32.
  • the compressed air lines 31 and 32 preferably have the same inner diameter.
  • the mixing chamber 10 is connected to a reel 44 via a delivery line 33.
  • a hose with an extinguishing gun 20 is located on the reel 44.
  • the hose can have a length of 20 m, for example.
  • the extinguishing device described above has an operating time of 110 seconds and a throwing distance of 16 m. If required, the operating time can be increased by installing larger containers and compressed air cylinders.
  • a foam regulator can be provided for professional use by fire departments.

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Nozzles (AREA)
EP01915056A 2000-03-03 2001-02-28 Chambre de melange destinee a la production de mousse a air comprime pour des installations d'extinction Expired - Lifetime EP1259296B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10010141A DE10010141C1 (de) 2000-03-03 2000-03-03 Mischkammer zur Erzeugung von Druckluftschaum für Löschanlagen
DE10010141 2000-03-03
PCT/DE2001/000752 WO2001064290A1 (fr) 2000-03-03 2001-02-28 Chambre de melange destinee a la production de mousse a air comprime pour des installations d'extinction

Publications (2)

Publication Number Publication Date
EP1259296A1 true EP1259296A1 (fr) 2002-11-27
EP1259296B1 EP1259296B1 (fr) 2007-09-19

Family

ID=7633219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01915056A Expired - Lifetime EP1259296B1 (fr) 2000-03-03 2001-02-28 Chambre de melange destinee a la production de mousse a air comprime pour des installations d'extinction

Country Status (10)

Country Link
US (1) US7458427B2 (fr)
EP (1) EP1259296B1 (fr)
JP (1) JP3967132B2 (fr)
CN (1) CN1174781C (fr)
AT (1) ATE373507T1 (fr)
AU (1) AU4228101A (fr)
CA (1) CA2401679C (fr)
DE (3) DE10010141C1 (fr)
ES (1) ES2293981T3 (fr)
WO (1) WO2001064290A1 (fr)

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Also Published As

Publication number Publication date
EP1259296B1 (fr) 2007-09-19
CN1406145A (zh) 2003-03-26
ES2293981T3 (es) 2008-04-01
DE10010141C1 (de) 2001-10-04
WO2001064290A1 (fr) 2001-09-07
DE20180049U1 (de) 2002-10-17
JP3967132B2 (ja) 2007-08-29
AU4228101A (en) 2001-09-12
JP2003525094A (ja) 2003-08-26
US20030010506A1 (en) 2003-01-16
US7458427B2 (en) 2008-12-02
ATE373507T1 (de) 2007-10-15
CA2401679C (fr) 2009-01-06
DE50113032D1 (de) 2007-10-31
CN1174781C (zh) 2004-11-10
CA2401679A1 (fr) 2001-09-07

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