EP4041442B1 - Système de mélange destiné à des systèmes d'extinction d'incendie, et procédé de fonctionnement d'un tel système de mélange - Google Patents

Système de mélange destiné à des systèmes d'extinction d'incendie, et procédé de fonctionnement d'un tel système de mélange Download PDF

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Publication number
EP4041442B1
EP4041442B1 EP20789024.5A EP20789024A EP4041442B1 EP 4041442 B1 EP4041442 B1 EP 4041442B1 EP 20789024 A EP20789024 A EP 20789024A EP 4041442 B1 EP4041442 B1 EP 4041442B1
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EP
European Patent Office
Prior art keywords
extinguishing agent
admixing
motor
line
rotational speed
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EP20789024.5A
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German (de)
English (en)
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EP4041442A1 (fr
Inventor
Andreas Hulinsky
Fritz Zimmermann
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Firedos GmbH
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Firedos GmbH
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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C5/00—Making of fire-extinguishing materials immediately before use
    • A62C5/002—Apparatus for mixing extinguishants with water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
    • B01F23/451—Mixing liquids with liquids; Emulsifying using flow mixing by injecting one liquid into another
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C5/00—Making of fire-extinguishing materials immediately before use
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/49—Mixing systems, i.e. flow charts or diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
    • B01F35/831—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices using one or more pump or other dispensing mechanisms for feeding the flows in predetermined proportion, e.g. one of the pumps being driven by one of the flows

Definitions

  • the present invention relates to a proportioning system for fire extinguishing systems.
  • a fire extinguishing system in the sense of the present invention is a system having a pump, a line system and a foam agent admixing system with which an extinguishing agent can be dispensed, in particular through nozzles, foam pipes or foam generators.
  • the fire extinguishing system can be a stationary system such as a fire extinguishing system in a tank farm with a permanently mounted so-called monitor, i.e. H. a large jet pipe, or a permanently installed sprinkler system in a building. But it can also be a mobile system on a vehicle or roll-off container.
  • Such fire extinguishing systems are usually operated with water as an extinguishing agent.
  • an extinguishing agent additive here a foam agent
  • the extinguishing agent-extinguishing agent additive mixture (the so-called "premix") is foamed in a nozzle by supplying air and applied to the fire to be extinguished.
  • the volume ratio of the extinguishing agent additive to the extinguishing agent is typically between 0.5% and 6%.
  • extinguishing agent additive that can be mixed with the extinguishing agent is a wetting agent, which reduces the surface tension of the extinguishing agent, in particular the extinguishing water. This is advantageous, for example, when fighting forest fires because the extinguishing water can wet larger areas, especially on the leaves of trees, and can therefore be used more efficiently. Furthermore, the reduced surface tension allows the extinguishing water to penetrate deeper into the forest floor, for example in order to extinguish deeper pockets of embers.
  • foaming agents that can also be used as wetting agents (if necessary with other admixing rates, in particular with a minimum admixing rate of 0.1%).
  • the invention is described below in part using the example of water as an extinguishing agent and foam agent as an extinguishing agent additive. However, this should not be construed as limiting.
  • the invention can also be used when admixing any extinguishing agent additives to any extinguishing agent.
  • both the extinguishing agent and the extinguishing agent additive can be provided in an extinguishing agent tank or in an extinguishing agent additive tank or via an extinguishing agent supply line or via an extinguishing agent additive supply line.
  • an extinguishing agent pump is also required, which conveys the extinguishing agent from the extinguishing agent tank, pressurizes it and feeds it to the admixing system.
  • the components just mentioned are not part of the proportioning system itself.
  • the mixture to be produced from the extinguishing agent and the extinguishing agent additive i.e. H.
  • the premix is then passed in the form of a premix stream through a foaming nozzle, in which ambient air is sucked in through the premix stream and mixed with the premix. This activates the foam agent in the premix and foams the premix so that an extinguishing agent foam emerges from the foaming nozzle and can be applied to the fire.
  • the air required to foam the foam agent can also be supplied to the premix in the form of compressed air.
  • a CAFS system Compressed Air Foam System
  • the admixing system has an admixing pump through which the extinguishing agent additive can be conveyed and mixed with the extinguishing agent.
  • the admixing pump is driven by a motor, which in turn is driven by a flow of the extinguishing agent itself.
  • the admixing system thus has a water motor that is driven by the extinguishing water flow.
  • the output shaft of the water motor is coupled to the input shaft of the proportioning pump, for example by a clutch.
  • the extinguishing agent additive conveyed by the admixing pump is then passed through an extinguishing agent additive line from the admixing pump into an admixing line and mixed there with the extinguishing agent stream in order to generate the premix.
  • An admixing system for admixing foam agent into extinguishing water with a constant admixing rate which has the structure described above, is approximately in the EP 0 296 652 A2 shown.
  • the water motor is designed as an inverted screw pump and an admixing pump driven by the motor is also designed as one or more screw pumps.
  • This structure of the admixing system in which the admixing pump is driven by the extinguishing agent flow that is already present, has the advantage that the admixing pump does not require any drive energy, in particular electricity, from outside, which means that the admixing system is very fail-safe. Furthermore, the delivery rate of the admixing pump is essentially proportional to the speed of the motor, which in turn is essentially proportional to the flow rate of the extinguishing agent stream. In this way, a substantially constant admixing rate is automatically achieved without the need for further control or regulation devices.
  • a technical property of water motors is that they only work reliably above a certain minimum flow rate of the water that drives them. If the driving water flow does not reach this minimum flow rate, the water motor will only achieve poor efficiency. This effect is caused in particular by internal friction of the engine components and by an internal leak in the engine.
  • the extinguishing water flow driving the motor is thus artificially increased and the working range of the motor is raised to a range in which the motor works reliably (so-called start-up reduction).
  • the motor can always be operated at or above a minimum flow rate of the extinguishing water stream required for its reliable operation.
  • the diverted part of the extinguishing water flow can be returned to the extinguishing water tank, i.e. H.
  • the diverted part of the extinguishing water flow circulates in the fire extinguishing system and is therefore not lost.
  • the branching takes place at a branching point before (i.e. upstream) the admixing point, at which the extinguishing agent additive, in particular a foaming agent, is mixed into the extinguishing water.
  • the extinguishing agent additive in particular a foaming agent
  • the diversion of part of the extinguishing water flow is triggered when the proportioning system starts up, that a branch valve in a branch line starting from the branch point is opened when an alarm valve, which is inside the fire extinguishing system but outside the proportioning system itself, is triggered.
  • a certain value for example 500 l/min
  • the start-up reduction is no longer required and the branch valve is closed again.
  • the pressure loss generated by the admixing system is transferred in the form of a differential pressure between two control lines to a differential pressure-controlled control valve and this is closed at a corresponding differential pressure.
  • the invention is therefore based on the object of increasing operational safety in an admixing system for fire extinguishing systems with the structure described above.
  • the invention is based on an admixing system for fire extinguishing systems for admixing an extinguishing agent additive, in particular a foam agent, to an extinguishing agent, in particular water.
  • the admixing system has a motor that can be driven by a flow of extinguishing agent, in particular a water motor, with an input for supplying the extinguishing agent to the engine, in particular from an extinguishing agent tank or from an extinguishing agent supply line, an output for discharging the extinguishing agent from the engine and an output that can be driven by the engine output shaft.
  • a flow of extinguishing agent in particular a water motor
  • the admixing system also has an admixing pump for conveying the extinguishing agent additive, in particular a piston pump, with a drive shaft which is coupled to the output shaft of the motor, an input for providing the extinguishing agent additive, in particular from an extinguishing agent additive tank or from an extinguishing agent additive supply line, and an output for discharge of the extinguishing agent additive.
  • an admixing pump for conveying the extinguishing agent additive in particular a piston pump
  • a drive shaft which is coupled to the output shaft of the motor
  • an input for providing the extinguishing agent additive in particular from an extinguishing agent additive tank or from an extinguishing agent additive supply line
  • an output for discharge of the extinguishing agent additive in particular from an extinguishing agent additive tank or from an extinguishing agent additive supply line
  • the admixing system has an admixing line with a first, engine-side end and a second, output-side end, the engine-side end being fluidly connected to the output of the engine.
  • the admixing system has an extinguishing agent additive line with a first, pump-side end and a second, admixing-line-side end, the pump-side end being connected to the output of the admixing pump and the admixing-line-side end being connected to the admixing line at an admixing point which is different from the motor-side end of the admixing line. is fluidly connected.
  • the admixing system also has a branch line with a first, admixing line-side end and a second, outlet-side end, the admixing line-side end being fluidly connected to the admixing line at a branching point which lies between the engine-side end of the admixing line and the admixing point.
  • the admixing system has a branch valve which is arranged in the branch line.
  • the admixing system further has an engine tachometer and a controller.
  • the control is set up to completely or partially open and/or close the branch valve depending on the engine speed measured by the engine tachometer.
  • a measurement of the engine speed reflects the state of the admixing system and in particular of the engine more precisely and reliably than, for example, the differential pressure measurement used previously. In this way, no component arranged outside the proportioning system, such as the previously used alarm valve, is required, so that the entire proportioning system can be tested before delivery, regardless of external components added later. In this way, the operational reliability of the proportioning system is increased and the underlying task is solved.
  • the controller is set up to fully open the branch valve when the branch valve is closed and the engine speed is greater than zero and below a first predetermined speed. In this way, the start of the motor is detected and the branching off of part of the extinguishing agent flow is activated.
  • the first predetermined speed can indicate an engine speed above which a branch is not necessary or not desired.
  • control is set up to completely close the branch valve when the branch valve is open and the engine speed is above a second predetermined speed.
  • the second predetermined speed can in turn indicate an engine speed above which a branch is not necessary or not desired.
  • the control is set up to partially open and/or close the branch valve depending on the measured engine speed to such an extent that the sum of the flow rate of the extinguishing agent stream in the branch line and the flow rate of the extinguishing agent stream at the output end the admixing line essentially corresponds to the flow rate of an extinguishing agent stream which drives the motor at a third predetermined speed.
  • the third predetermined speed can indicate an engine speed at which a branch is just necessary or desired. In this case, the diverted part of the extinguishing agent flow is just large enough to reach the third predetermined speed. In other words, the diverted part of the extinguishing agent flow is just as large as necessary, but as small as possible.
  • the first, second and third predetermined speeds are selected such that in the range of the respective predetermined speed, the motor speed is essentially proportional to the flow rate of the extinguishing agent stream driving the motor.
  • the motor speed is essentially proportional to the flow rate of the extinguishing agent stream driving the motor.
  • the extinguishing agent stream can be discharged into the surroundings of the admixing system at the outlet end of the branch line.
  • This possibility of discharging the branched part of the extinguishing agent stream is particularly advantageous if the extinguishing agent is not provided from an extinguishing agent tank, but rather from an extinguishing agent supply line, in particular under pressure becomes. In this case, it would be technically difficult to feed the diverted extinguishing agent back into the extinguishing agent supply line.
  • discharge into the environment of the admixing system is not problematic from an environmental point of view.
  • the admixing system 1 is supplied with extinguishing water from an extinguishing water tank 23, the fill level of which can be monitored by a float 47.
  • the extinguishing water is pumped out of the extinguishing water tank 23 by an extinguishing water pump 27, which is driven by a motor 29 via a coupling 28, and is thereby filtered through a filter 32.
  • a shut-off valve 30, 31 is arranged in front of the extinguishing water pump 27 and after the filter 32.
  • the water motor 2 preferably works according to the displacement principle, more preferably according to the reciprocating piston or rotation principle.
  • the extinguishing water reaches the motor-side end 11 of the admixing line 10 and is from there passed through the admixing line 10 to its output end 12, to which the consumer or consumers of the fire extinguishing system, such as one or more sprinkler nozzles or also connect a foam nozzle and an extinguishing monitor (neither shown).
  • the consumer or consumers of the fire extinguishing system such as one or more sprinkler nozzles or also connect a foam nozzle and an extinguishing monitor (neither shown).
  • the output shaft 5 of the water motor 2 is connected to the drive shaft 9 of a proportioning pump 6 via a clutch 25. With the output shaft 5 of the Water motor 2 also causes the drive shaft 9 of the proportioning pump 6 to rotate and in turn drives the proportioning pump 6.
  • the admixing pump 6 is preferably a plunger pump or an adjustable plunger pump.
  • the admixing pump 6 conveys an extinguishing agent additive, in particular a foaming agent, which is provided in the extinguishing agent additive tank 24, the fill level of which can also be monitored by a float 42.
  • the extinguishing agent additive first passes through a shut-off valve 40 and a non-return valve 41 to a 3-way ball valve 44, the function of which is described further below, and in the corresponding "suction" position of the 3-way ball valve 44 to the inlet 7 of the proportioning pump 6, where it is sucked in by the admixing pump 6, pressurized by it and conveyed to the outlet 8 of the admixing pump 6.
  • the extinguishing agent additive reaches the pump-side end 14 of the extinguishing agent additive line 13.
  • the admixing pump 6 and the extinguishing agent additive line 13 can be vented via a vent valve 51.
  • the pressure of the extinguishing agent additive in the extinguishing agent additive line 13 can be monitored via a pressure gauge 45.
  • the extinguishing agent additive first reaches a 3-way ball valve 34, the function of which is also described below, and in the corresponding "mixing" position of the 3-way ball valve 34 to the admixing line-side end 15 of the extinguishing agent additive line 13, where this is connected to the admixing line 10.
  • the mixing point 16 is also located there, where the extinguishing agent additive is mixed with the extinguishing water.
  • the volume ratio between the added extinguishing agent additive and the extinguishing water, ie the admixing rate is essentially constant, for example 3%.
  • a check valve 33 arranged in front of (i.e. upstream) the admixing point 16 in the extinguishing agent additive line 13 prevents extinguishing water from penetrating into the extinguishing agent additive line 13 in the direction of the admixing pump 6. Accordingly, a check valve 43 arranged in front of (i.e. upstream) the admixing point 16 in the admixing line 10 prevents extinguishing agent additive from penetrating into the admixing line 10 in the direction of the water motor 2.
  • the 3-way ball valves 34, 44 can each be brought into a further position in order to initiate an additional function of the admixing system 1:
  • the extinguishing agent additive is not led from the extinguishing agent additive line 13 to the admixing point 16, but rather via a return line 35 and a counter-pressure valve 37 into an extinguishing agent additive measuring container 36, the fill level of which can be monitored by a float 38 .
  • a relief valve 52 with a larger opening pressure than that of the counter-pressure valve 37 is provided in front of (ie upstream) the 3-way ball valve 34 in a further line between the extinguishing agent additive line 13 and the extinguishing agent additive measuring container 36.
  • the volume of the extinguishing agent additive conveyed by the admixing pump 6 in a certain time interval can be measured and compared with the - for example calculated - volume of the extinguishing water flowing through the water motor 2 in the same time interval. In this way, compliance with the desired admixing rate can be checked.
  • extinguishing agent additive to the extinguishing agent additive measuring container 36 allows the control measurement described to be carried out without the extinguishing agent additive actually having to be mixed into the extinguishing water.
  • the extinguishing agent additive collected in the extinguishing agent additive measuring container 36 can then be returned to the extinguishing agent additive tank 24 via a stopcock 39 and is therefore not lost during the control measurement.
  • part of the extinguishing water is diverted in front of (i.e. upstream) the water motor 2 and fed into the proportioning pump 6 in order to rinse it.
  • the extinguishing water used to flush the admixing pump 6 then flows, as described above for the extinguishing agent additive, through the extinguishing agent additive line 13 at the admixing point 16 back into the admixing line 10. In this way, the admixing pump 6 can be flushed with extinguishing water, so that there is no separate supply for this Rinse water must be kept available.
  • the three lines that are connected to the ball valve 44 can alternatively be directly connected to one another in a fluid-conducting manner (similar to the admixing point 16). Then, instead of the ball valve 44, a shut-off valve and a check valve are preferably arranged in the line coming from the fire water pump 27 and branched off in front of the water motor 2 (not shown).
  • the open stopcock then corresponds to the "flushing" position of the 3-way ball valve 44, whereby the diverted part of the extinguishing water is directed into the admixing pump 6 in order to flush it, and the closed stopcock corresponds to the "suction" position of the 3rd valve described above -way ball valve 44.
  • the non-return valve prevents extinguishing agent additive from getting into the line coming from the extinguishing water pump 27 and from there to the water motor 2.
  • the check valve 41 prevents extinguishing water from getting into the extinguishing agent additive tank 24.
  • the admixing line end 18 of the branch line 17 is located at a branch point 20 in the admixing line 10, and the outlet end 19 of the branch line 17 is connected to the extinguishing water tank 23. Since the branch point 20 is located on the admixing line 10 in front of (i.e. upstream) the check valve 43 and the admixing point 16, it is ensured that only extinguishing water, but no extinguishing agent additive or premix, gets into the branch line 17 and from there back into the extinguishing water tank 23.
  • the branch line 17 can be opened and closed by a controllable branch valve 21.
  • a slide 49, a pressure reducer 50, a further slide 48 and an orifice 26 are arranged on the branch line 17 after (i.e. downstream) the branch valve 21.
  • the pressure on the branch line 17 can be monitored by a pressure gauge 46.
  • the branch line 17 serves to reduce start-up, ie to ensure reliable operation of the water motor 2 even with small extinguishing agent flows required at the output end 12 of the admixing line 10, by circulating an additional, branched extinguishing water flow through the water motor 2.
  • the minimum extinguishing agent flow from which the required admixture rate can be reliably achieved for example from 200 l/min to 60 to 80 l/min, i.e. to around a third.
  • the engine speed associated with this minimum extinguishing agent flow is referred to below as U min .
  • the start-up reduction is controlled by a control (not shown) of the admixing system 1.
  • This is connected to an engine tachometer 22, which continuously measures the speed of the water engine 2.
  • the engine tachometer 22 can, for example, be a proximity switch attached to the clutch 25, which receives a pulse from a magnetic pulse generator attached to one of the shafts 5, 9 with each revolution of the shafts 5, 9. From this, the proximity switch itself or the control determines the speed of the water motor 2.
  • control is connected to the branch valve 21 and can open and close it using appropriate signals.
  • signals for completely opening or completely closing the branch valve 21 are provided.
  • the control opens the branch valve 21 as soon as the engine tachometer 22 detects an engine speed that is greater than 0 but less than rpm .
  • the water motor 2 has already started, ie the admixing system 1 is in operation, but the extinguishing agent flow required is smaller than required for reliable operation of the water motor 2. Therefore, by opening the branch valve 21, part of the extinguishing water flow flowing through the water motor 2 is diverted into the branch line 10 for the purpose of reducing start-up.
  • control closes the branch valve 21 as soon as the engine tachometer 22 detects an engine speed that is greater than U min .
  • the water motor 2 then runs in a speed range in which its reliable operation is guaranteed. A start-up reduction is therefore not necessary and the branch can be switched off by closing the branch valve 21.

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Claims (9)

  1. Système d'ajout et de mélange (1) pour des installations d'extinction d'incendie pour la production d'un prémélange de mélange agent extincteur/additif d'agent extincteur par ajout et mélange d'un additif d'agent extincteur, en particulier d'un agent moussant, à un agent extincteur, en particulier de l'eau, avec
    - un moteur (2) pouvant être entraîné par un flux d'agent extincteur, en particulier un moteur à eau, avec une entrée (3) pour l'amenée de l'agent extincteur au moteur (2), en particulier à partir d'un réservoir d'agent extincteur (23) ou à partir d'une conduite d'alimentation d'agent extincteur, une sortie (4) pour l'évacuation de l'agent extincteur du moteur (2) et un arbre de sortie (5) pouvant être entraîné par le moteur (2),
    - une pompe d'ajout et de mélange (6) pour transporter l'additif d'agent extincteur, en particulier une pompe à piston, avec un arbre d'entraînement (9), lequel est couplé à l'arbre de sortie (5) du moteur (2), une entrée (7) pour la fourniture de l'additif d'agent extincteur, en particulier à partir d'un réservoir d'additif d'agent extincteur (24) ou à partir d'une conduite d'alimentation d'additif d'agent extincteur, et une sortie (8) pour l'évacuation de l'additif d'agent extincteur,
    - une conduite d'ajout et de mélange (10) avec une première extrémité côté moteur (11) et une deuxième extrémité côté distribution (12), dans lequel l'extrémité côté moteur (11) est en liaison fluidique avec la sortie (4) du moteur (2),
    - une conduite d'additif d'agent extincteur (13) avec une première extrémité côté pompe (14) et une deuxième extrémité côté conduite d'ajout et de mélange (15), dans lequel l'extrémité côté pompe (14) est en liaison fluidique avec la sortie (8) de la pompe d'ajout et de mélange (6) et l'extrémité côté conduite d'ajout et de mélange (15) avec la conduite d'ajout et de mélange (10) en un emplacement d'ajout et de mélange (16), laquelle est différente de l'extrémité côté moteur (11) de la conduite d'ajout et de mélange (10),
    - une conduite de dérivation (17) avec une première extrémité côté conduite d'ajout et de mélange (18) et une deuxième extrémité côté sortie (19), dans lequel l'extrémité côté conduite d'ajout et de mélange (18) est en liaison fluidique avec la conduite d'ajout et de mélange (10) en un emplacement de dérivation (20), lequel se situe entre l'extrémité côté moteur (11) de la conduite d'ajout et de mélange (10) et l'emplacement d'ajout et de mélange (16), et
    - une soupape de dérivation (21), laquelle est disposée dans la conduite de dérivation (17),
    caractérisé en ce que
    le système d'ajout et de mélange (1) présente en outre un dispositif de mesure de vitesse de rotation du moteur (22) et une commande et que la commande est conçue pour ouvrir et/ou pour fermer totalement ou partiellement la soupape de dérivation (21) en fonction de la vitesse de rotation du moteur mesurée par le dispositif de mesure de vitesse de rotation du moteur (22).
  2. Système d'ajout et de mélange (1) selon la revendication 1, caractérisé en ce que la commande est conçue pour ouvrir entièrement la soupape de dérivation (21) lorsque la soupape de dérivation (21) est fermée et que la vitesse de rotation du moteur est supérieure à zéro et se situe au-dessous d'une première vitesse de rotation (Umin) prédéfinie.
  3. Système d'ajout et de mélange (1) selon la revendication 2, caractérisé en ce que dans la plage de la première vitesse de rotation (Umin) prédéfinie la vitesse de rotation du moteur est sensiblement proportionnelle au débit du flux d'agent extincteur entraînant le moteur (2).
  4. Système d'ajout et de mélange (1) selon au moins l'une des revendications précédentes, caractérisé en ce que la commande est conçue pour fermer entièrement la soupape de dérivation (21) lorsque la soupape de dérivation (21) est ouverte et la vitesse de rotation du moteur se situe au-dessus d'une deuxième vitesse de rotation (Umin) prédéfinie.
  5. Système d'ajout et de mélange (1) selon la revendication 4, caractérisé en ce que dans la plage de la deuxième vitesse de rotation (Umin) prédéfinie la vitesse de rotation du moteur est sensiblement proportionnelle au débit du flux d'agent extincteur entraînant le moteur (2).
  6. Système d'ajout et de mélange (1) selon au moins l'une des revendications précédentes, caractérisé en ce que la commande est conçue pour ouvrir et/ou pour fermer partiellement la soupape de dérivation (21) en fonction de la vitesse de rotation du moteur mesurée tant que la somme du débit du flux d'agent extincteur dans la conduite de dérivation (17) et du flux d'agent extincteur à l'extrémité côté distribution (12) de la conduite d'ajout et de mélange (10) correspond sensiblement au débit d'un flux d'agent extincteur, qui entraîne le moteur (2) avec une troisième vitesse de rotation (Umin) prédéfinie.
  7. Système d'ajout et de mélange (1) selon la revendication 6, caractérisé en ce que dans la plage de la troisième vitesse de rotation (Umin) prédéfinie la vitesse de rotation du moteur est sensiblement proportionnelle au débit du flux d'agent extincteur entraînant le moteur (2).
  8. Système d'ajout et de mélange (1) selon au moins l'une des revendications précédentes, caractérisé en ce que le flux d'agent extincteur à l'extrémité côté sortie (19) de la conduite de dérivation (17) peut être évacué dans l'environnement du système d'ajout et de mélange (1).
  9. Procédé pour le fonctionnement d'un système d'ajout et de mélange (1) selon au moins l'une des revendications précédentes avec les étapes :
    - d'amenée d'un flux d'agent extincteur à l'entrée (3) du moteur (2),
    - d'entraînement du moteur (2) par le flux d'agent extincteur,
    - d'entraînement de l'arbre de sortie (5) du moteur (2) par le moteur (2),
    - d'évacuation de l'agent extincteur de la sortie (4) du moteur (2) dans la conduite d'ajout et de mélange (10),
    - de dérivation d'une partie de l'agent extincteur à l'emplacement de dérivation (20) à partir de la conduite d'ajout et de mélange (10) dans la conduite de dérivation (17), au cas où la soupape de dérivation (21) serait entièrement ou partiellement ouverte,
    - de sortie de la partie dérivée de l'agent extincteur à l'extrémité côté sortie (19) de la conduite de dérivation (17),
    - d'entraînement de l'arbre d'entraînement (9) de la pompe d'ajout et de mélange (6) par l'arbre de sortie (5) du moteur (2),
    - d'entraînement de la pompe d'ajout et de mélange (6) par l'arbre d'entraînement (9) de celle-ci,
    - de fourniture de l'additif d'agent extincteur à l'entrée (7) de la pompe d'ajout et de mélange (6),
    - de transport de l'additif d'agent extincteur par la pompe d'ajout et de mélange (6),
    - d'évacuation de l'additif d'agent extincteur de la sortie (8) de la pompe d'ajout et de mélange (6) dans la conduite d'additif d'agent extincteur (13),
    - d'ajout et de mélange de l'additif d'agent extincteur à l'agent extincteur dans la conduite d'ajout et de mélange (10) à l'emplacement d'ajout et de mélange (16),
    - de distribution du mélange (prémélange) agent extincteur/additif d'agent extincteur à l'extrémité côté distribution (12) de la conduite d'ajout et de mélange (10).
    - de mesure de la vitesse de rotation du moteur par le dispositif de mesure de vitesse de rotation du moteur (22),
    - d'ouverture et/ou fermeture totale ou partielle de la soupape de dérivation (21) par la commande en fonction de la vitesse de rotation du moteur mesurée.
EP20789024.5A 2019-10-08 2020-10-02 Système de mélange destiné à des systèmes d'extinction d'incendie, et procédé de fonctionnement d'un tel système de mélange Active EP4041442B1 (fr)

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DE102019215406.9A DE102019215406A1 (de) 2019-10-08 2019-10-08 Zumischsystem für Feuerlöschanlagen
PCT/EP2020/077617 WO2021069313A1 (fr) 2019-10-08 2020-10-02 Système de mélange destiné à des systèmes d'extinction d'incendie, et procédé de fonctionnement d'un tel système de mélange

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IT1205181B (it) * 1987-06-25 1989-03-15 Snam Progetti Dispositivo di miscelazione in continuo particolarmente adatto alla preparazione di soluzioni acquose di schiumogeno per impianti anticendio
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EP4041442A1 (fr) 2022-08-17
CN114502244A (zh) 2022-05-13
CN114502244B (zh) 2023-06-02
ES2972022T3 (es) 2024-06-10
WO2021069313A1 (fr) 2021-04-15
US20220362595A1 (en) 2022-11-17
PL4041442T3 (pl) 2024-04-15

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