WO2010082349A1 - 火災防災設備及び散布方法 - Google Patents
火災防災設備及び散布方法 Download PDFInfo
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- WO2010082349A1 WO2010082349A1 PCT/JP2009/050653 JP2009050653W WO2010082349A1 WO 2010082349 A1 WO2010082349 A1 WO 2010082349A1 JP 2009050653 W JP2009050653 W JP 2009050653W WO 2010082349 A1 WO2010082349 A1 WO 2010082349A1
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- Prior art keywords
- water
- fire
- spraying
- voltage
- disaster prevention
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- 238000005507 spraying Methods 0.000 title claims abstract description 66
- 230000002265 prevention Effects 0.000 title claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 123
- 239000002245 particle Substances 0.000 claims abstract description 90
- 230000006698 induction Effects 0.000 claims abstract description 64
- 239000007921 spray Substances 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000005684 electric field Effects 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 31
- 239000007924 injection Substances 0.000 claims description 31
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 230000007480 spreading Effects 0.000 claims description 24
- 238000007590 electrostatic spraying Methods 0.000 claims description 7
- 239000011810 insulating material Substances 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000013535 sea water Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 239000000779 smoke Substances 0.000 description 40
- 230000000694 effects Effects 0.000 description 23
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 4
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
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- 230000008033 biological extinction Effects 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/58—Pipe-line systems
- A62C35/64—Pipe-line systems pressurised
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/58—Pipe-line systems
- A62C35/68—Details, e.g. of pipes or valve systems
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0072—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using sprayed or atomised water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/053—Arrangements for supplying power, e.g. charging power
- B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
- B05B5/0535—Electrodes specially adapted therefor; Arrangements of electrodes at least two electrodes having different potentials being held on the discharge apparatus, one of them being a charging electrode of the corona type located in the spray or close to it, and another being of the non-corona type located outside of the path for the material
Definitions
- the present invention relates to a fire disaster prevention facility and a spraying method for spraying water, seawater, and a water-based fire extinguishing agent containing a fire extinguishing agent from a head.
- the water mist fire extinguishing equipment reduces the water particles to 20-200 ⁇ m, which is a fraction of that of sprinkler equipment and water spray equipment, and discharges it into the space. Therefore, the fire extinguishing effect with a small amount of water is expected.
- An object of the present invention is to provide a fire disaster prevention facility and a spraying method that can efficiently extinguish and suppress a fire with a small spray amount of a water-based fire extinguisher.
- the present invention provides fire prevention equipment, A fire extinguisher supply facility for supplying a water-based fire extinguisher under pressure through a pipe; An electrifying spraying head that is installed in a protective compartment and is charged and sprayed on fire-extinguishing agent spray particles pressurized by a fire extinguishing agent supply facility; A voltage application unit for applying a charging voltage to the charging and spreading head; It is provided with.
- the charging spray head is An injection nozzle that converts and sprays water-based extinguishing agent into particles by spraying to the external space;
- An induction electrode portion arranged on the injection space side of the injection nozzle;
- a water-side electrode portion disposed inside the injection nozzle and in contact with an aqueous fire extinguishing agent;
- the voltage application unit applies an external electric field generated by applying a voltage between the induction electrode unit and the water-side electrode unit of the electrostatic spraying head to a water-based fire extinguisher that is in the process of being jetted by the jet nozzle, so that the jet particles are discharged.
- the water-side electrode part of the charging and spreading head is a part of the injection nozzle using a conductive material or a pipe using a conductive material.
- the induction electrode portion of the charging and spreading head is either a metal having conductivity, a resin having conductivity, a rubber having conductivity, or a composite thereof, and has a ring shape, a cylindrical shape, a vertical plate shape, and a parallel plate shape.
- the shape is either a linear shape or a wire mesh shape.
- the charging spray head sets the voltage of the water-side electrode part to zero volts and drops it to the ground, and applies a predetermined charging voltage from the voltage application part to the induction electrode part.
- the voltage application unit applies a predetermined charging voltage in the form of direct current, alternating current, or pulse to the induction electrode unit.
- the voltage application unit applies a predetermined charging voltage not exceeding ⁇ 20 kilovolts to the induction electrode unit.
- the water-based fire extinguisher is water, seawater, or water containing a chemical that enhances fire fighting power.
- the present invention provides a method for spraying fire prevention equipment, In the event of a fire, water-based extinguishing agent is pressurized and supplied to the electrostatic spraying head installed in the protection zone via the piping. When spraying spray particles of fire extinguishing agent supplied under pressure from a charge spraying head, the spray particles are charged and sprayed. It is characterized by that.
- the water particles adhere not only to the high-temperature combustion surface but also to all surfaces of the combustion material due to the Coulomb force. Compared with normal water particles that are not, the wetting effect is greatly increased and the fire extinguishing power can be increased.
- the smoke extinguishing performance of the smoke generated at the time of fire is greatly improved compared to the conventional non-charged spraying, which is an image that could not be initially expected. This is a periodical result.
- an equivalent smoke-extinguishing effect is obtained with about 1/5 the amount of fire extinguishing water at the time of conventional non-charged spraying.
- Explanatory drawing which showed embodiment of the fire disaster prevention equipment by this invention Explanatory drawing which took out and showed the protection area A of FIG.
- Explanatory drawing which showed embodiment of the charge distribution head using a ring induction electrode part Explanatory diagram showing experimental results to confirm that smoke from fire is charged The graph figure which showed the experimental result which confirms the smoke-extinguishing effect by this embodiment
- the time chart which showed the applied voltage supplied to the charge distribution head of this embodiment
- FIG. 1 is an explanatory view showing an embodiment of a fire disaster prevention facility according to the present invention.
- a charging spray head 10 according to the present embodiment is installed on the ceiling side of protective areas A and B such as a computer room in a building.
- a pipe 16 is connected to the electrostatic spraying head 10 from a protruding side of a pump unit 12 installed with respect to a water source 14 that functions as a fire extinguishing agent supply facility via a manual valve (gate valve) 13. Later, it is connected via a pressure regulating valve 30 and an automatic opening / closing valve 32 to the charging and spreading head 10 installed in each of the protection areas A and B.
- a dedicated fire detector 18 for controlling the spraying from the charging spraying head 10 is installed in each of the protection areas A and B. Further, an interlocking control relay device 20 is provided for each of the protection areas A and B, and a manual operation box 22 for performing spraying control from the charging spraying head 10 by manual operation is provided.
- a signal line from the dedicated fire detector 18 and the manual operation box 22 is connected to the interlock control relay device 20, and a signal line for applying a voltage for charging driving to the charging spraying head 10, and A signal line for opening / closing the automatic opening / closing valve 32 is drawn out.
- a fire detector 26 of an automatic fire alarm facility is installed and connected to a sensor line from a receiver 28 of the automatic fire alarm facility.
- the fire detector 26 of the automatic fire alarm facility is not provided in the protection area B, it is a matter of course that it may be provided as necessary.
- the interlock control relay device 20 installed corresponding to the protection areas A and B is connected to the system monitoring control panel 24 by a signal line.
- a receiver 28 of an automatic fire alarm facility is also connected to the system monitoring control panel 24. Further, the system monitoring control panel 24 connects the pump unit 12 to the signal line and controls the pump start / stop in the pump unit 12.
- FIG. 2 is an explanatory diagram showing the protection area A in FIG.
- a charging spray head 10 is installed on the ceiling side of the protection area A.
- a pipe 16 from the pump unit 12 shown in FIG. 1 is connected to the electrification spraying head 10 via a pressure regulating valve 30 and an automatic opening / closing valve 32.
- a voltage application unit 15 is installed on the upper part of the charging / spreading head 10.
- a fire extinguishing that applies a predetermined voltage to the charging / spreading head 10 and ejects it from the charging / spreading head 10. The agent is charged so that it can be sprayed.
- a dedicated fire detector 18 is installed on the ceiling side of the protection area A, and a fire detector 26 of an automatic fire alarm facility is also connected.
- FIG. 3 shows an embodiment of the charge distribution head 10 shown in FIGS. 1 and 2, and this embodiment is characterized in that a ring induction electrode portion is used.
- the charging and spreading head 10 has a head main body 36 screwed and fixed to the tip of a falling pipe 34 connected to the pipe from the pump unit 12.
- a cylindrical water-side electrode portion 40 is incorporated inside the front end of the head main body 36 via an insulating member 41.
- the ground cable 50 is drawn from the voltage application unit 15 installed on the upper side of the water side electrode unit 40 and installed inside the head main body 36 via an insulating member 43. It is connected to the water side electrode part 40. With the connection by the ground cable 50, the water-side electrode unit 40 has an applied voltage of 0 volts and is dropped to the ground side.
- the injection nozzle 38 is provided below the water side electrode unit 40.
- the injection nozzle 38 includes a nozzle rotor 38a provided inside the water-side electrode portion 40 and a nozzle head 38b provided on the tip side.
- the injection nozzle 38 receives supply of the water-based extinguishing agent pressurized from the pump unit 12 of FIG. 1 from the falling pipe 34, passes through the nozzle body 38a, and is injected to the outside from the nozzle head 38b. Water-based fire extinguishing agent is converted into particles and sprayed.
- the spray pattern sprayed from the spray nozzle 38 has a so-called full cone shape.
- the cover 42 made of an insulating material is fixed to the spray nozzle 38 with a screw through a fixing member 43.
- the cover 42 is a substantially cylindrical member, and a ring-shaped induction electrode portion 44 is incorporated into the lower opening by screwing a stopper ring 46.
- the ring-shaped induction electrode portion 44 has an opening 45 through which spray particles from the spray nozzle 38 pass at the center of the ring-shaped main body.
- An electrode application cable 48 is drawn from the upper voltage application unit 15 shown in FIG. 2 to the ring-shaped induction electrode unit 44 disposed at the lower part of the cover 42, and the electrode application cable 48 is made of a cover 42 made of an insulating material. And is connected to the ring-shaped induction electrode portion 44 so that a voltage can be applied.
- the water-side electrode portion 40 and the ring-shaped induction electrode portion 44 used in the charging / spreading head 10 of the present embodiment of the present embodiment in addition to the conductive metal, conductive resin, conductive It may be a rubber having properties, or a combination thereof.
- the voltage application unit 15 shown in FIG. 2 is operated by a control signal from the interlock control relay device 20 shown in FIG.
- An applied voltage in the form of a direct current, an alternating current, or a pulse that does not exceed 20 kilovolts is applied to the ring-shaped induction electrode portion 44 on the ground side that becomes a bolt.
- the dedicated fire detector 18 detects a fire and sends a fire detection signal to the system monitoring control panel 24 via the interlock control relay device 20.
- the pump unit 12 When the system monitoring and control panel 24 receives a notification from the dedicated fire detector 18 installed in the protection area A, the pump unit 12 is activated, fire-extinguishing water is pumped from the water source 14 and pressurized by the pump unit 12, Supply.
- the system monitoring control panel 24 outputs a start signal for the charging and spreading head 10 to the interlock control relay device 20 provided corresponding to the protection area A.
- the interlock control relay device 20 opens the automatic opening / closing valve 32, whereby the water-based fire extinguisher having a constant pressure regulated by the pressure regulating valve 30 is passed through the opened automatic opening / closing valve 32. It is supplied to the charging spraying head 10 and sprayed as spray particles from the charging spraying head 10 to the protection area A as shown in FIG.
- the interlock control relay device 20 sends an activation signal to the voltage application unit 15 provided in the charge distribution head 10 shown in FIG. 2, and the voltage application unit 15 receives the activation signal, for example, to the charge distribution head 10.
- An applied voltage that is DC, AC, or pulsed, which is several kilovolts, is supplied.
- the ground cable 50 is connected when the water-based fire extinguishing agent pressurized from the spray nozzle 38 is sprayed and converted into sprayed particles.
- the water-side electrode portion 40 is set to 0 volts, and a voltage of several kilovolts is applied to the ring-like induction electrode portion 44 side to which the voltage application cable 48 is connected.
- the sprayed particles converted by spraying can be charged and sprayed by being applied to an aqueous fire extinguisher that is sprayed and passing through the opening 45 of the ring-shaped induction electrode portion 44.
- the water particles sprayed from the electrostatic spraying head 10 toward the protection area A where the fire F is generated are charged with water, so that the fire F is generated by the Coulomb force due to charging.
- the smoke extinguishing effect in the present embodiment is that the conventional smoke extinguishing effect due to the dispersion of water particles is a capturing action due to a stochastic collision between water particles and smoke particles.
- the smoke particles that are also in the charged state are collected by the Coulomb force, thereby exerting a significant smoke eliminating action.
- the particle diameter of the water particles sprayed from the charging spray head 10 of the present embodiment includes, for example, those having various particle diameters when the spray nozzle 38 of FIG. 3A is used.
- the particle diameter of the water particles is not particularly specified, but in consideration of the advantage of adhesion to the combustion substance by Coulomb force, many water particles of about 200 ⁇ m or less are included. It is desirable to use a simple injection nozzle 38.
- the fire extinguishing effect according to this embodiment will be described.
- the water particles are charged, so that they are not only attached to the high combustion surface by the Coulomb force but also the combustion agent.
- the wettability is greatly increased as compared with conventional non-charged water particles, so that a high fire extinguishing power is obtained.
- the fire extinguishing performance is greatly improved as compared with the conventional non-charging water particle spraying.
- the charged spraying of the present embodiment greatly improves the smoke evacuation performance of the smoke generated during the fire.
- FIG. 4A is a photograph of a synchroscope showing the state of charge of smoke measured by a passing type Faraday gauge.
- Fig. 4 (A) shows the output of the pass-through Faraday gauge when there is no smoke, and it is within an almost constant noise level.
- FIG. 4B shows the output of the passing type Faraday gauge when smoke is passed, and the synchroscope waveform is greatly shaken on the screen, indicating that the charged state of the smoke particles is remarkable.
- the reason why a high smoke-extinguishing effect can be obtained by electrification spraying according to this embodiment is that the conventional trapping of smoke by non-charging spraying is a trapping means by stochastic collision of smoke particles and water particles. If the water particles are charged, the smoke particles in the charged state are collected by the Coulomb force, as is apparent from the synchroscope waveform of FIG.
- the charged water particles are 100 to 200 ⁇ m
- the similarly charged smoke particles are 1 to 2 ⁇ m, and many small smoke particles around the water particles are collected by Coulomb force. As a result, a great smoke eliminating effect is obtained.
- FIG. 5 is a graph showing the experimental results of Experimental Example 2.
- FIG. 5 show elapsed time on the horizontal axis and smoke density on the vertical axis.
- the experimental characteristic 100 is a charging distribution according to the present embodiment
- the experimental characteristic 200 is a conventional non-charging distribution.
- spraying starts at time t2.
- the first charge spraying is performed from time t2 to t3, and the smoke density rapidly decreases to 1.3% by this first charge spraying.
- the change in smoke density from time t2 to time t3 is a sudden change in the state of smoke in the enclosed space, which was black when viewed visually, so that the smoke disappears and the inside can be seen a little while seeing. It is a smoke-extinguishing action, which takes place during a charging spray of only 60 seconds.
- the second charge spraying is performed from time t4 to t5. Thereafter, when the charge spraying is repeated as t6 to t7, t8 to t9, t10 to t11, the number of charging sprays
- the smoke concentration can be extinguished to approximately 0 percent, that is, no smoke at all by, for example, the fifth charge application.
- the conventional characteristic 200 that is non-charged dispersion as in the experimental characteristic of the present embodiment, at time t2 to t3, time t4 to t5, time t6 to t7, time t8 to t9, and time t10 to t11.
- the uncharged spraying is performed five times at an interval of 120 seconds, but the smoke density is gradually decreased, which is different from the experimental characteristic 100 of the present embodiment in the conventional non-charged experimental characteristic 200.
- the smoke concentration is almost double, and it is confirmed from the comparison of the experimental results that a significant smoke eliminating effect can be obtained in this embodiment.
- the smoke-extinguishing effect according to the present embodiment which has been clarified from the experimental results shown in FIG. 5, is that the present inventor initially has a certain degree of fire-extinguishing effect at the stage where the idea of introducing charging spraying into fire extinguishing is obtained. Although it had a prospect, it was a remarkable result that had never predicted the smoke-removal effect.
- FIG. 6 is a time chart showing the applied voltage applied from the voltage application unit 15 of the present embodiment to the charging / spreading head 10.
- FIG. 6A shows a case where a + V DC voltage is applied. In this case, negatively charged water particles are continuously dispersed.
- FIG. 6B shows a case where a DC voltage of ⁇ V is applied. In this case, positively charged water particles are continuously dispersed.
- FIG. 6C shows a case where an AC voltage of ⁇ V is applied.
- negatively charged water particles are continuously dispersed in accordance with the change of the AC voltage during the positive half cycle period.
- positively charged water particles are alternately scattered according to the change of the AC voltage.
- FIG. 6D shows a case in which a + V pulse voltage is applied at a predetermined interval.
- negatively charged water particles are intermittently scattered and no voltage is applied.
- FIG. 6 (E) shows a case where a pulsed voltage of ⁇ V is applied at a predetermined interval, and in this case, a period in which positively charged water particles are intermittently dispersed and no voltage is applied. In this case, water particles that are not charged are scattered.
- FIG. 6 (F) shows a case where a pulsed voltage of ⁇ V is alternately applied with a predetermined interval, and in this case, negatively charged water particles and positively charged water particles are placed at intervals. During the period in which the voltage is alternately applied and no voltage is applied, uncharged water particles are scattered.
- a commercially available boosting unit with a control input can be used as the voltage application unit 15 for supplying the charging voltage shown in FIG. 6 to the charging / spreading head 10.
- Some commercially available boosting units output DC to 20 kilovolts when DC 0 to 20 volts is applied to the input, and such commercially available units can be used.
- FIG. 7 is an explanatory view showing another embodiment of a charging and spreading head using a cylindrical induction electrode portion.
- a head main body 36 is screwed and fixed to the tip of a falling pipe 34, and a water-side electrode portion 40 is interposed inside the head main body 36 via an insulating member 41.
- the earth cable 50 is connected to the top from here.
- An injection nozzle 38 is disposed below the water-side electrode unit 40, and the injection nozzle 38 includes a nozzle body (rotor) 38a and a nozzle head 38b.
- a cylindrical cover 56 is attached to the outside of the lower portion of the nozzle head 38 b via a fixing member 43.
- a cylindrical induction electrode portion 52 is disposed inside the opening of the lower end of the cover 56 by fixing the stopper ring 58 with screws.
- the cylindrical induction electrode portion 52 has a through hole 54 formed inside the cylindrical body as shown in the plan view taken out in FIG.
- a cable 48 is connected to the cylindrical induction electrode portion 52 through a cover 56 made of an insulating material, and an applied voltage for charging is supplied.
- the water-side electrode portion 40 is set to 0 volts. For example, a voltage of several kilovolts is applied to the cylindrical induction electrode portion 52, and water particles radiated from the injection nozzle 38 pass through the space of the through hole 54 of the cylindrical induction electrode portion 52 in which an external electric field is generated.
- the charged water particles can be dispersed by being charged during the passing jetting process.
- FIG. 8 is an explanatory view showing another embodiment of a charging / spreading head using a wire mesh induction electrode portion.
- the head main body 36 is screwed and fixed to the lower part of the falling pipe 34, and the water-side electrode portion 40 is disposed therein via an insulating member 41. Is connected to the ground cable 50.
- a cover 62 is attached to the lower side of the injection nozzle 38 via a fixing member 43, and a wire mesh induction electrode portion 60 is attached to an opening inside the cover 62.
- the wire mesh induction electrode portion 60 has a planar shape shown in FIG. 8B and uses a metal wire mesh having a predetermined mesh.
- the cover 62 is an insulating material, and a voltage can be applied by connecting the voltage application cable 48 through the cover 62 to the wire mesh induction electrode portion 60.
- the water-side electrode portion 40 when water-based fire extinguisher is sprayed from the spray nozzle 38 and converted into water particles, the water-side electrode portion 40 is set to 0 volts, and a voltage such as several kilovolts on the wire mesh induction electrode portion 60 side. Is applied in the form of pulses or alternating current to generate an external electric field in the jet space from the jet nozzle 38, and the jet particles passing therethrough are charged when passing through the mesh opening of the wire mesh induction electrode portion 60. Thus, charged water particles can be dispersed.
- FIG. 9 is an explanatory view showing an embodiment of a charging / spreading head using a parallel plate induction electrode portion.
- the spray nozzle 68 is fixed to the lower portion of the falling pipe 34 with screws.
- the water-side electrode portion uses the falling pipe 34 itself, and therefore the ground cable 50 is directly connected to the falling pipe 34 using the connection ring 66.
- a ring holder 70 is fixed to the lower part of the injection nozzle 68 with screws, and a pair of plate-like holders 72a and 72b are arranged in parallel with the ring holder 70 in a state of being cantilevered downward.
- Parallel plate induction electrode portions 74a and 74b are fixed to the inner relative surfaces of the holders 72a and 72b.
- the plan view seen from the lower side of the parallel plate induction electrode portions 74a and 74b is arranged in parallel as shown in FIG.
- the holders 72a and 72b are made of an insulating material, and several kilovolts are formed by connecting the branch cables 48a and 48b penetrating the voltage application cable 48 at the branch portion 76 to the parallel plate induction electrode portions 74a and 74b, respectively. The applied voltage is applied.
- FIG. 10 is an explanatory view showing another embodiment of the charging / spreading head using the needle-like induction electrode portion.
- an injection nozzle 68 is screwed and fixed to the tip of a falling pipe 34 used as a water-side electrode portion, and a connection ring 66 is attached to the falling pipe 34.
- the ground cable 50 is electrically connected.
- a ring holder 80 is attached to the tip end side of the injection nozzle 68 via a fixing member 43.
- a needle-like induction electrode portion 78 is attached to the lower part of the ring holder 80.
- the needle-like induction electrode portion 78 is bent in an inverted L shape and has a needle shape with its tip bent obliquely toward the opening of the injection nozzle 68.
- a plan view seen from below is shown in FIG. It becomes like this.
- the voltage application cable 48 is electrically connected to the needle-like induction electrode portion 78 attached to the ring holder 80.
- the falling pipe 34 that functions as the water-side electrode portion and the needle-like shape disposed on the nozzle tip side
- a voltage of several kilovolts between the induction electrode portion 78 and the external electrode an external electric field is generated in the space between the nozzle opening and the tip of the needle-like induction electrode portion 78, and this is injected from the injection nozzle 68.
- the sprayed particles are charged during the spraying process for conversion into water particles, and can be dispersed as charged water particles.
- the charging voltage applied to the charging / spreading head is also set to 0 volt for the water-side electrode portion and a plus / minus applied voltage for the induction electrode portion side, a plus-only applied voltage, or a minus-only applied voltage. This can be determined as needed according to the situation on the combustion member side to be extinguished.
- the present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.
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- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Electrostatic Spraying Apparatus (AREA)
- Nozzles (AREA)
Abstract
Description
本発明は火災防災設備を提供するものであり、
水系の消火剤を、配管を介して加圧供給する消火剤供給設備と、
防護区画に設置され、消火剤供給設備により加圧供給された消火剤の噴射粒子に帯電させて散布する帯電散布ヘッドと、
帯電散布ヘッドに帯電電圧を印加する電圧印加部と、
を備えたことを特徴とする。
水系の消火剤の外部空間への噴射により粒子に変換して散布する噴射ノズルと、
噴射ノズルの噴射空間側に配置した誘導電極部と、
噴射ノズルの内部に配置されて水系の消火剤に接触する水側電極部と、
を備え、
電圧印加部は、帯電散布ヘッドの誘導電極部と水側電極部との間に電圧を加えることにより生じる外部電界を、噴射ノズルにより噴射過程にある水系の消火剤に印加して、噴射粒子を帯電させる。
(散布方法)
本発明は火災防災設備の散布方法を提供するものであり、
火災時に水系の消火剤を、配管を介して防護区間に設置された帯電散布ヘッドに加圧供給し、
帯電散布ヘッドから加圧供給された消火剤の噴射粒子を散布する際に、噴射粒子に帯電させて散布する、
ことを特徴とする。
(実験例1)
木材クリブ火災の消火試験結果
実験条件
ノズル噴射量:8リットル/分at1MPa
誘導電極電圧:2キロボルト
火災模型:12ミリメートル角、150ミリメートル角材×22本
着火剤:nヘプタン着火
消火時間
帯電あり:14秒
帯電なし:54秒
この実験結果から、本実施形態による帯電散布にあっては、非帯電散布時の約26パーセントの消火水量、即ち約4分の1の消火水量で、同等の消火効果が得られている。
(実験例2)
ノズル噴射量:8リットル/分at1MPa
誘導電極電圧:2キロボルト
放水パターン:パルス状印加放水
火災模型:1.8立方メートルの閉鎖空間内でガソリン50ミリリットルを燃焼させて煙を充満させた後、60秒放水と120秒のインターバルで5サイクルの散布を実施して、煙の濃度推移を測定
図5は実験例2による実験結果を示したグラフ図である。図5の実験結果は、横軸に経過時間、縦軸に煙濃度を示している。また実験特性100が本実施形態による帯電散布であり、実験特性200が従来の非帯電による散布である。
Claims (14)
- 水系の消火剤を、配管を介して加圧供給する消火剤供給設備と、
防護区画に設置され、前記消火剤供給設備により加圧供給された消火剤の噴射粒子に帯電させて散布する帯電散布ヘッドと、
前記帯電散布ヘッドに帯電電圧を印加する電圧印加部と、
を備えたことを特徴とする火災防災設備。
- 請求項1記載の火災防災設備に於いて、
前記帯電散布ヘッドは、
水系の消火剤の外部空間への噴射により粒子に変換して散布する噴射ノズルと、
前記噴射ノズルの噴射空間側に配置した誘導電極部と、
前記噴射ノズルの内部に配置されて水系の消火剤に接触する水側電極部と、
を備え、
前記電圧印加部は、前記誘導電極部と水側電極部との間に電圧を加えることにより生じる外部電界を、前記噴射ノズルにより噴射過程にある水系の消火剤に印加して、噴射粒子を帯電させることを特徴とする火災防災設備。
- 請求項2記載の火災防災設備に於いて、前記帯電散布ヘッドの水側電極部は、導電性の材質を使用した噴射ノズルまたは導電性の材質を使用した配管の一部であることを特徴とする火災防災設備。
- 請求項2記載の火災防災設備に於いて、前記帯電散布ヘッドの誘導電極部は、導電性を有する金属、導電性を有する樹脂又は導電性を有するゴムのいずれか又は複合体であって、リング形状、円筒形状、垂直平板形状、平行板形状、線形状又は金網状のいずれかの形状であることを特徴とする火災防災設備。
- 請求項2記載の火災防災設備に於いて、前記帯電散布ヘッドは、前記水側電極部の電圧をゼロボルトとして且つアースに落とし、前記誘導電極部に前記電圧印加部からの所定の帯電電圧を印加することを特徴とする火災防災設備。
- 請求項5記載の火災防災設備に於いて、前記電圧印加部は、前記誘導電極部に直流、交流又はパルス状となる所定の帯電電圧を印加することを特徴とする火災防災設備。
- 請求項5記載の火災防災設備に於いて、前記電圧印加部は前記誘導電極部に±20キロボルトを越えない所定の帯電電圧を印加することを特徴とする火災防災設備。
- 請求項2記載の火災防災設備に於いて、前記誘導電極の一部又は全部を絶縁性材料で被覆したことを特徴とする火災防災設備。
- 請求項1記載の火災防災設備に於いて、前記水系の消火剤は、水、海水、消火力を強化する薬剤を含有した水であることを特徴とする火災防災設備。
- 火災時に水系の消火剤を、配管を介して防護区間に設置された帯電散布ヘッドに加圧供給し、
前記帯電散布ヘッドから加圧供給された消火剤の噴射粒子を散布する際に、前記噴射粒子に帯電させて散布する、
ことを特徴とする火災防災設備の散布方法。
- 請求項10記載の火災防災設備の散布方法に於いて、
前記帯電散布ヘッドは、
水系の消火剤の外部空間への噴射により粒子に変換して散布する噴射ノズルと、
前記噴射ノズルの噴射空間側に配置した誘導電極部と、
前記噴射ノズルの内部に配置されて水系の消火剤に接触する水側電極部と、
を備え、
前記誘導電極部と水側電極部との間に電圧を加えることにより生じる外部電界を、前記噴射ノズルにより噴射過程にある水系の消火剤に印加して、噴射粒子を帯電させることを特徴とする火災防災設備の散布方法。
- 請求項11記載の火災防災設備の散布方法に於いて、前記水側電極部の電圧をゼロボルトとして且つアースに落とし、前記誘導電極部に所定の帯電電圧を印加することを特徴とする火災防災設備の散布方法。
- 請求項12記載の火災防災設備の散布方法に於いて、前記誘導電極部に直流、交流又はパルス状となる所定の帯電電圧を印加することを特徴とする火災防災設備の散布方法。
- 請求項12記載の火災防災設備の散布方法に於いて、前記誘導電極部に±20キロボルトを越えない所定の帯電電圧を印加することを特徴とする火災防災設備の散布方法。
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EP17197232.6A EP3292889B1 (en) | 2009-01-19 | 2009-01-19 | Electrification spray head |
AU2009337336A AU2009337336B2 (en) | 2009-01-19 | 2009-01-19 | Fire Prevention Equipment and Spraying Method |
CN200980146619.0A CN102223925B (zh) | 2009-01-19 | 2009-01-19 | 消防设备及喷洒方法 |
EP09838317.7A EP2388047B1 (en) | 2009-01-19 | 2009-01-19 | Fire disaster prevention facility and spraying method |
PCT/JP2009/050653 WO2010082349A1 (ja) | 2009-01-19 | 2009-01-19 | 火災防災設備及び散布方法 |
US13/086,582 US8413735B2 (en) | 2009-01-19 | 2011-04-14 | Fire prevention equipment and spraying method |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013171880A1 (ja) * | 2012-05-17 | 2013-11-21 | ホーチキ株式会社 | 火災防災装置、帯電散布装置、帯電散布ヘッド、消火剤散布方法及び帯電散布方法 |
TWI681795B (zh) * | 2015-04-28 | 2020-01-11 | 日商森田宮田工業股份有限公司 | 組件型自動滅火設備 |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102223925B (zh) * | 2009-01-19 | 2014-07-09 | 报知机股份有限公司 | 消防设备及喷洒方法 |
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58174258A (ja) * | 1982-04-05 | 1983-10-13 | Minato Seiyaku Kk | 静電消煙用帯電霧化粒子発生装置 |
JPH03186277A (ja) * | 1989-12-18 | 1991-08-14 | Nagao Kogyo:Kk | 消火消煙装置 |
JPH03186276A (ja) * | 1989-12-18 | 1991-08-14 | Nagao Kogyo:Kk | 消煙装置 |
JPH10118214A (ja) | 1996-10-16 | 1998-05-12 | Bunka Shutter Co Ltd | ウォーターミストを利用した消火、消煙方法及びその装置 |
JPH11192320A (ja) | 1997-10-30 | 1999-07-21 | Nippon Dry Chem Co Ltd | ウォーターミスト消火設備及びその方法 |
JP2005287655A (ja) * | 2004-03-31 | 2005-10-20 | Mitsubishi Heavy Ind Ltd | 静電消煙装置 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4120017A (en) * | 1976-11-05 | 1978-10-10 | Ppg Industries, Inc. | Detachable power supply for induction type electrostatic spray gun |
US4135667A (en) * | 1977-03-23 | 1979-01-23 | Hajtomuvek Es Festoberendezesek Gyara | Apparatus for the electrostatic coating of workpieces |
US4566636A (en) * | 1983-07-11 | 1986-01-28 | Micropure, Incorporated | Producing liquid droplets bearing electrical charges |
JPH0192320A (ja) | 1987-10-02 | 1989-04-11 | Kawasaki Steel Corp | フラッシュバット溶接を施した高張力鋼の接合部のじん性改善方法 |
US5353879A (en) * | 1989-12-18 | 1994-10-11 | Kabushiki Kaisha Nagao Kogyo | Door having smoke reducing apparatus associated therewith |
DE19517494C2 (de) * | 1995-05-12 | 2002-07-04 | Ind Rationalisierungs Syst | Feuerlöschvorrichtung für eine elektrostatische Beschichtungsvorrichtung |
US7104337B2 (en) * | 2003-04-01 | 2006-09-12 | David Everett Jones | Electrostatic fire control and extinguishing device |
CN2691650Y (zh) * | 2004-04-01 | 2005-04-13 | 袁野 | 电子灭火器 |
TWI397435B (zh) * | 2008-02-28 | 2013-06-01 | Hochiki Co | Fire nozzle head device |
CN102223925B (zh) * | 2009-01-19 | 2014-07-09 | 报知机股份有限公司 | 消防设备及喷洒方法 |
EP2425877B1 (en) * | 2009-04-27 | 2017-09-06 | Hochiki Corporation | Fire prevention equipment |
-
2009
- 2009-01-19 CN CN200980146619.0A patent/CN102223925B/zh not_active Expired - Fee Related
- 2009-01-19 EP EP17197232.6A patent/EP3292889B1/en active Active
- 2009-01-19 EP EP09838317.7A patent/EP2388047B1/en not_active Not-in-force
- 2009-01-19 WO PCT/JP2009/050653 patent/WO2010082349A1/ja active Application Filing
- 2009-01-19 KR KR1020117012266A patent/KR101283871B1/ko active IP Right Grant
- 2009-01-19 AU AU2009337336A patent/AU2009337336B2/en not_active Ceased
-
2011
- 2011-04-14 US US13/086,582 patent/US8413735B2/en active Active
-
2013
- 2013-03-08 US US13/789,991 patent/US8776902B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58174258A (ja) * | 1982-04-05 | 1983-10-13 | Minato Seiyaku Kk | 静電消煙用帯電霧化粒子発生装置 |
JPH03186277A (ja) * | 1989-12-18 | 1991-08-14 | Nagao Kogyo:Kk | 消火消煙装置 |
JPH03186276A (ja) * | 1989-12-18 | 1991-08-14 | Nagao Kogyo:Kk | 消煙装置 |
JPH10118214A (ja) | 1996-10-16 | 1998-05-12 | Bunka Shutter Co Ltd | ウォーターミストを利用した消火、消煙方法及びその装置 |
JPH11192320A (ja) | 1997-10-30 | 1999-07-21 | Nippon Dry Chem Co Ltd | ウォーターミスト消火設備及びその方法 |
JP2005287655A (ja) * | 2004-03-31 | 2005-10-20 | Mitsubishi Heavy Ind Ltd | 静電消煙装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2388047A4 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013171880A1 (ja) * | 2012-05-17 | 2013-11-21 | ホーチキ株式会社 | 火災防災装置、帯電散布装置、帯電散布ヘッド、消火剤散布方法及び帯電散布方法 |
TWI681795B (zh) * | 2015-04-28 | 2020-01-11 | 日商森田宮田工業股份有限公司 | 組件型自動滅火設備 |
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EP3292889A1 (en) | 2018-03-14 |
EP2388047B1 (en) | 2018-01-10 |
EP2388047A4 (en) | 2015-04-08 |
KR20110079854A (ko) | 2011-07-08 |
US8776902B2 (en) | 2014-07-15 |
US20130180737A1 (en) | 2013-07-18 |
AU2009337336A1 (en) | 2010-07-22 |
CN102223925B (zh) | 2014-07-09 |
US8413735B2 (en) | 2013-04-09 |
KR101283871B1 (ko) | 2013-07-08 |
AU2009337336B2 (en) | 2012-01-19 |
EP3292889B1 (en) | 2019-06-19 |
US20110186311A1 (en) | 2011-08-04 |
EP2388047A1 (en) | 2011-11-23 |
CN102223925A (zh) | 2011-10-19 |
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