JP5519481B2 - Gas pressure extinguishing damper drive system for fire extinguishing equipment - Google Patents

Description

  The present invention relates to a pressure-proof damper drive device for a gas fire extinguishing facility, which is also called a so-called inert fire extinguishing facility, which uses an inert gas such as nitrogen gas or argon gas that is highly safe for the human body as a fire extinguishing agent gas.

  A typical prior art is disclosed in Patent Document 1, for example. In this prior art, the operation of the gas fire extinguishing equipment is detected, the pressure relief damper of the exhaust duct is kept open for a predetermined time set by a timer, and the fire extinguisher gas released in the space to be protected A pressure-reducing damper driving device that closes the pressure-reducing damper after preventing the pressure from increasing is proposed.

  The pressure avoidance damper driving device maintains the protection pressure damper of the exhaust duct for a predetermined period of time in accordance with the operation of the gas fire extinguishing equipment, so that the protection compartment target space corresponding to the amount of fire extinguisher gas released. The inside air is exhausted through the exhaust duct one after another, and the pressure inside the space to be protected is prevented from rising due to the discharged extinguishing agent gas. I try to close it. Therefore, discharge of air in the protection compartment target space corresponding to the amount of fire extinguisher gas released is maintained with the pressure relief damper of the exhaust duct open, and the concentration of the fire extinguishing agent gas in the protection compartment target space is set to a predetermined value. Value is maintained.

Japanese Patent Laid-Open No. 9-287805

  In the above-described prior art pressure avoidance damper driving device, the operation of the gas fire extinguishing equipment is detected, and the pressure relief damper of the exhaust duct is kept open for a predetermined time set by a timer, and the fire extinguisher gas released Since the pressure relief damper is closed after preventing the pressure in the protective compartment target space from increasing, the timer setting time must be adjusted in advance according to the volume of the protective compartment target space. In other words, there is a problem that initial setting requires labor. In addition, since the time to close the pressure damper is fixed at the time set by the timer, it cannot follow changes in the pressure difference, temperature difference, wind pressure, etc. There is a problem in that the concentration of the extinguishing agent gas released into the protected compartment target space varies.

  The object of the present invention is that no effort is required for the initial setting, and the concentration of the extinguishing agent gas in the protective compartment target space can be optimally maintained by following environmental changes such as differential pressure, temperature difference, and wind pressure. It is providing the pressure-proof damper drive device of gas type fire extinguishing equipment.

The present invention provides an injection nozzle that is installed in a space to be protected, a pipe that leads a gas-based fire extinguishing agent to the injection nozzle, an exhaust duct that communicates the space with the outdoor space, and an escape duct that is installed in the exhaust duct. A pressure damper drive device for a gas fire extinguishing equipment that supplies a gas fire extinguisher to the pipe in response to an activation signal,
Temperature detecting means for detecting the temperature of the pipe;
The pressure-reducing damper driving device for the gas fire extinguishing equipment includes a control means for closing the pressure-reducing damper when the temperature detected from the temperature detecting means changes from lowering to rising.

  Further, the present invention is characterized in that it includes a heating means that is provided in the pipe and generates heat by the operation of a gas fire extinguishing equipment to heat the pipe.

  Furthermore, the present invention is characterized in that the temperature detecting means is provided in a region to be heated by the heating means of the pipe or in the vicinity thereof.

  According to the present invention, the temperature of the pipe is detected by the temperature detecting means at the time of discharge. When the fire-extinguishing agent gas flows, the piping temperature rapidly decreases due to adiabatic expansion. When the gas flow stops, the temperature does not drop any further, and the end of the gas flow can be detected by this temperature change. This eliminates the need for initial settings such as the closing timing of the pressure damper, and optimizes the concentration of extinguishing gas in the target space of the protection compartment by following environmental changes such as differential pressure, temperature difference, and wind pressure. Can be maintained.

  In addition, according to the present invention, since the piping is heated by the heating means, the end of the gas flow can be detected more clearly, the rising point when the temperature is lowered can be easily detected, and the rising of the piping can be accelerated. As a result, the timing for closing the pressure-proof damper can be improved.

  Furthermore, according to the present invention, since the temperature detection means is provided in or near the heating target area by the pipe heating means, the temperature detection means can detect the temperature change of the pipe with high sensitivity, and the pressure-proof damper is closed. It is possible to increase the accuracy of timing.

It is the simplified vertical sectional view of the gas fire extinguishing equipment 2 in which the pressure avoidance damper drive device 1 of one embodiment of the present invention is installed. 3 is a system diagram showing the configuration of the gas fire extinguishing equipment 2. FIG. 4 is a flowchart for explaining the operation of the gas fire extinguishing equipment 2. 5 is a graph for explaining the operation of a damper control unit 14;

  FIG. 1 is a simplified vertical sectional view of a gas fire extinguishing equipment 2 in which a pressure avoidance damper driving device 1 according to an embodiment of the present invention is installed. The gas fire extinguishing equipment 2 of the present embodiment is a gas fire extinguishing equipment that is also called a so-called inert fire extinguishing equipment that uses an inert gas such as nitrogen gas or argon gas that is highly safe for the human body as a fire extinguishing agent gas. The pressure-reducing damper driving device 1 is provided.

  The pressure avoidance damper driving device 1 is implemented in the gas fire extinguishing equipment 2. The gas fire extinguishing equipment 2 includes a plurality of injection nozzles 4 installed in a space (hereinafter referred to as a protection compartment target space) 3 that is defined as a target of a protection section, and a pipe that guides the gas fire extinguishing agent to the injection nozzle 4 5, an exhaust duct 7 that communicates the protected space 3 and the outdoor space 6, a pressure-proof damper 8 installed in the exhaust duct 7, a fire detector 9 that outputs a detection signal in the event of a fire, and a fire occurrence A start button 10 that outputs a start signal by pressing at times, and a fire extinguishing device 11 that supplies a gas fire extinguishing agent to the pipe 5 in response to a detection signal from the fire detector 9 or a start signal from the start button 10. Prepare.

  The protection zone target space 3 in the building 13 is, for example, an indoor parking lot in a concrete structure building 13, and is partitioned by a slab, an inner wall, or the like constituting the building 13, and the fire extinguisher gas released is protected by the protection zone target space. 3 is realized by a space of a sealed structure such as a room, a passage, a warehouse, etc. of the building 13 so as not to flow out.

  The exhaust duct 7 is made of a refractory material such as a metal plate, and includes a plurality of straight pipes and curved pipes whose cross-sectional shape perpendicular to the gas flow direction A from the protection compartment target space 3 to the outdoor space 6 is rectangular or circular. Connected and configured. The dimensions of each straight pipe portion of the exhaust duct 7 are, for example, a vertical width of 1000 mm, a horizontal width of 1000 mm, and a length of 20 to 40 m.

  The pressure avoidance damper 8 uses an electromagnetic solenoid, a pneumatic cylinder, or the like as an actuator, for example, and is opened and closed by a drive signal from the fire extinguishing device 11. With such a configuration, the concentration of the extinguishing agent gas in the protection compartment target space 3 can be maintained at an optimum predetermined value according to the volume of the protection compartment target space 3.

  The temperature sensor 12 is provided in a region to be heated by the heating means of the pipe or in the vicinity thereof, and in this embodiment, the temperature sensor 12 is attached to the surface of a region of the pipe 5 where a heater 15 described later is mounted.

  FIG. 2 is a system diagram showing the configuration of the gas fire extinguishing equipment 2. The pressure avoidance damper driving device 1 controls the temperature sensor 12 that is a temperature detecting means for detecting the temperature of the pipe 5 and opens the pressure avoidance damper 8 when the detected temperature T from the temperature sensor 12 changes from a decrease to an increase. A damper control unit 14 that is a means, and a heater 15 that is a heating means that is provided in the pipe 5 and generates heat by the operation of the fire extinguishing device 11 provided in the gas fire extinguishing equipment 2 to heat the pipe 5.

  The fire extinguishing device 11 includes a pressure vessel main body 17 filled with a liquefied inert gas that is highly safe for human bodies such as nitrogen gas and argon gas, a container valve 18 attached to the pressure vessel main body 17, And an operation control unit 19 that opens the container valve 18 in response to an activation signal from the fire detector 9 or an activation signal from the activation button 10.

  The operation control unit 19 is realized by, for example, a control panel of a fire extinguishing system installed in an existing building 13, and includes a central processing unit (abbreviated as CPU). The damper control unit 14 is realized by a computer equipped with a central processing unit (abbreviated as CPU), is connected to the operation control unit 19, and includes the activation signal and the like with the operation control unit 19. The operation signal is configured to be transmitted / received.

  The heater 15 is realized by, for example, a heat generating sheet that is covered with a heat generating resistor that generates Joule heat by supplying electric power between two silicon rubber films. Such a heat generating sheet has flexibility with a width of 200 to 250 mm and a length of 800 mm to 1700 mm, and is realized as a strip having a continuous use temperature of 200 ° C. to 250 ° C. It can be installed without being wound, it is easy to attach, and a heating means can be provided for the existing pipe 5 at low cost.

  The pressure avoidance damper 8 is opened at the same time as the extinguishing agent gas is released into the protection compartment target space 3, and an activation signal is input to the operation control unit 19 from the fire sensor 9 or the activation button 10. In response to the activation signal, an opening signal is output to the container valve 18 to open the container valve 18 to supply the fire extinguishing agent gas to the pipe 5 and to supply the activation signal to the damper controller 14.

  The damper control unit 14 opens the pressure avoidance damper 8 in response to the start signal input from the operation control unit 19, and the air in the protective compartment target space 3 corresponding to the amount of the extinguisher gas released is exhausted sequentially. It is possible to prevent the pressure in the protection section target space 3 from rising due to the fire extinguisher gas discharged to the outdoor space 6 through the duct 7.

  FIG. 3 is a flowchart for explaining the operation of the gas fire extinguishing equipment 2, and FIG. 4 is a graph for explaining the operation of the damper control unit 14. In FIG. 4, the vertical axis is the temperature detected by the temperature sensor 12, and the horizontal axis is time. First, in step s0, power is supplied to the fire extinguishing device 11 and the pressure avoidance damper driving device 1 to be in an operating state. At this time, the pressure damper 8 is in a closed state. Next, in step s1, the occurrence of a fire is detected by the fire detector 9, or when a reporter such as a fire discoverer presses the start button 10, a start signal is output from the fire detector 9 or the start button 10. The activation signal is input to the operation control unit 19.

  When the activation control unit 19 receives the activation signal from the fire detector 9 or the activation button 10 in step s1, the activation control unit 19 outputs an opening signal to open the container valve 18 and causes an alarm (not shown) to sound, Turn on the fire alarm lamp. When the container valve 18 is opened by the opening signal from the operation control unit 19, the liquefied extinguishing agent gas in the pressure vessel main body 17 is supplied to the pipe 5 through the container valve 18, and the target area of the protection section is supplied by each injection nozzle 4. 3 is released in a gasified state. At this time, the operation control unit 19 opens the pressure avoidance damper 8, and the damper control unit 14 supplies power to the heater 15 to generate heat. The pipe 5 is cooled by adiabatic expansion due to the injection of the liquefied extinguisher gas from the injection nozzle 4, and the temperature rapidly decreases.

The activation signal of the operation control unit 19 is also input to the damper control unit 14, and the temperature detection operation of the pipe 5 by the temperature sensor 12 is started from time t1. The temperature sensor 12 detects the detected temperature T _N of the pipe 5 (where N is a positive integer), for example, every cycle ΔW = 3 sec, and outputs it to the damper controller 14.

In step s2, the damper control unit 14 determines the difference ΔT (= T _N−1 −T) between the detected temperature T _N−1 at time t2 and the detected temperature T _N at time t3 after a period ΔW = 3 seconds from time t2. _N ) is calculated, and if the difference ΔT is ΔT <0 in step s3, the process returns to step s1 and the sampling operation of the pipe temperature by the temperature sensor 12 every 3 seconds is repeated. Such a sampling period ΔW is not limited to 3 sec. When high accuracy is required, it may be set as appropriate within a shorter period, for example, 0.5 sec ≦ ΔW <3 sec.

  If the difference ΔT is ΔT ≧ 0, the temperature of the pipe 5 tends to increase from the decreasing tendency, so that it can be determined that the extinguishing agent gas has been released, and the process proceeds to step s4. Thus, by heating the pipe 5 with the heater 15, the completion point of the extinguishing agent gas discharge can be detected with high accuracy and quickly as an inflection point from the decrease in the detection temperature to the increase, and the avoidance is avoided. The timing of closing the pressure damper 8 is made to follow changes in the differential pressure, temperature difference, wind pressure, etc. between the protective compartment target space 3 and the outdoor space 6, and the concentration of the extinguishing agent gas released into the protective compartment target space 3 is adjusted. Can be optimal.

  In the next step s4, the damper control unit 14 stops supplying power to the heater 15, outputs a damper closing signal to the operation control unit 19, and closes the pressure-reduction damper 8 by the operation control unit 19, and step s5. The fire extinguishing operation ends.

  In this way, it is possible to maintain the concentration of the extinguishing agent gas released into the protection compartment target space 3 within a desired optimum range. Further, since the temperature sensor 12 is provided in a region to be heated by the heater 15 of the pipe 5 or in the vicinity thereof, a temperature change of the pipe 5 can be detected with high sensitivity by the temperature sensor 12 and the pressure avoidance damper 8 is closed. Timing can be improved.

  When the liquefied extinguisher gas is released, the temperature of the pipe 5 is lowered by the adiabatic expansion of the liquefied extinguisher gas as described above, and then the liquefied extinguisher gas flows down in the pipe 5 from 20 sec. During 30 seconds, the temperature is maintained at a substantially constant temperature of −60 ° C. to −70 ° C., which is close to the temperature of the liquefied fire extinguisher gas. When the discharge of the liquefied extinguishing agent gas is completed, the endothermic expansion is completed, and thus the endothermic heat to the pipe 5 disappears, so that the temperature of the pipe 5 gradually increases.

  In the present embodiment, by actively heating the pipe 5, the time from the completion of the extinguishing agent gas release to the temperature rise is shortened, the rise in temperature is made steep, and the release of the extinguishing agent gas is completed. Although it is not restricted by the environmental temperature or the set time of the timer as in the prior art, it is intended to be detected accurately at an early stage with high accuracy. In another embodiment of the present invention, the heater 15 is provided. You may detect the temperature of the outer peripheral surface of the piping 5 with the temperature sensor 12, without using. Even in this case, the completion of the discharge of the liquefied fire extinguisher gas can be detected by the inflection point of the temperature change of the pipe 5 from the decrease to the increase. Can be detected.

DESCRIPTION OF SYMBOLS 1 Pressure-proof damper drive device 2 Gas system fire extinguishing equipment 3 Protective zone object space 4 Injection nozzle 5 Piping 6 Outdoor space 7 Exhaust duct 8 Pressure-proof damper 9 Fire detector 10 Start button 11 Fire extinguisher 12 Temperature sensor 13 Building 14 Damper control part 15 Heating means

Claims (3)

An injection nozzle installed in a space to be protected, a pipe for guiding a gas-based fire extinguisher to the injection nozzle, an exhaust duct communicating the space and the outdoor space, and a pressure-proof damper installed in the exhaust duct Equipped with a gas pressure extinguishing equipment for supplying a gas fire extinguishing agent to the piping in response to an activation signal,
Temperature detecting means for detecting the temperature of the pipe;
A pressure-reducing damper driving device for a gas fire extinguishing facility, comprising: a control unit that closes the pressure-reducing damper when the detected temperature from the temperature detecting unit changes from lowering to rising.   The pressure-reducing damper driving device for a gas fire extinguishing facility according to claim 1, further comprising a heating unit that is provided in the piping and generates heat by the operation of the gas fire extinguishing facility to heat the piping.   The said temperature detection means is provided in the heating object area | region by the said heating means of the said piping, or its vicinity, The pressure-reduction damper drive device of the gas type fire extinguishing equipment of Claim 2 characterized by the above-mentioned.

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