JP5112243B2 - Gas fire extinguishing method and equipment in environmental test equipment - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a gas fire extinguishing method and its equipment in an environmental test facility equipped with a constant pressure and constant temperature chamber, and more particularly, to a gas fire extinguishing method in an environmental test facility that satisfies both certainty for fire extinguishing and safety for humans. And its facilities.

With the recent globalization of the economy and industry, various products such as automobiles and electrical machines are being exported from Japan to various regions of the world.
By the way, the environment where products such as exported automobiles and electrical machines are used is different from the normal environment such as Japan, for example, under severe conditions such as high altitudes (atmospheric pressure: 430 mmHg, temperature: −40 ° C.). Since it is often used, a test for verifying that a product such as an automobile or an electric machine operates stably without failure under such a severe environment is required.
This test is not limited to the component parts that make up the product. In order to obtain highly reliable verification results, automobiles can be used in an environmental test facility equipped with a constant pressure and constant temperature room where the atmospheric pressure and temperature can be set freely. There has been a demand to make a product such as an electric machine in actual operation.

  On the other hand, when actually operating products such as automobiles and electrical machines in an environmental test facility equipped with such a constant pressure and constant temperature chamber, it is necessary to install a fire extinguishing facility because there is a risk of fire. When the temperature-controlled room is set to the above high altitude (atmospheric pressure: 430mmHg, temperature: -40 ° C), there is a risk of freezing in the fire extinguishing equipment piping, so water fire extinguishing equipment and foam fire extinguishing equipment cannot be used. Therefore, the gas fire extinguishing equipment having a low boiling point is used as the fire extinguishing equipment.

  By the way, gas fire extinguishing equipment normally discharges a gas extinguisher into the fire extinguishing target compartment, so that the oxygen concentration in the fire extinguishing target compartment becomes equal to or less than the fire extinguishing design concentration (extinguishing concentration). The amount of the gas extinguishing agent to be released is calculated based on the volume of the fire extinguishing target section and set in advance in the control device.

Currently available gas fire extinguishing equipment uses an inert gas such as carbon dioxide, nitrogen, etc., and lowers the oxygen concentration in the fire extinguishing target section to about 14% or less to shut off oxygen and not burn It is something to do. The oxygen concentration at normal pressure is about 14% or less (this time is defined as 12.5% or less) is the fire extinguishing design concentration.
By the way, it is reported that if the oxygen concentration is 12% or more in a room filled with oxygen-deficient air, there is almost no influence on the human body in the case of exposure for a short time of up to about 30 minutes. In addition, if the oxygen concentration in the air is 9-14%, it can be recovered even if a mild temporary failure occurs, but if the oxygen concentration is 10% or less, serious problems such as unconsciousness and convulsions may occur. There is also a report.
The above matters can be used if the air at the time of fire extinguishing is filled with other non-toxic gases, but in the case of gas fire extinguishing equipment using carbon dioxide as an inert gas, the design concentration of released carbon dioxide is about In this concentration, if there is a person in the fire extinguishing target area, there is a possibility that a situation relating to human life may occur due to the toxicity (anesthetic property) of carbon dioxide. There is a report that if the carbon dioxide concentration in the air is 7 to 10%, it falls within a few minutes.
In this regard, in the case of a gas fire extinguishing facility using nitrogen as an inert gas, the nitrogen gas itself has no toxicity (see, for example, Patent Document 1 and Non-Patent Document 1).

However, in a special environment such as a constant pressure and constant temperature room, for example, in the case of low pressure, the density of the gas becomes low, so the amount of the gas extinguishing agent released into the fire extinguishing target compartment is reduced to the normal fire extinguishing target compartment. However, depending on the amount of gas extinguisher released and changes in the environment, the oxygen concentration in the fire extinguishing target area where the gas extinguisher was released would be less than the flame extinguishing concentration. It is possible that fire extinguishing is impossible.
On the other hand, when the temperature is low, the gas density becomes high, so the amount of the gas extinguishing agent released into the fire extinguishing target section needs to be increased from the amount calculated based on the volume of the normal fire extinguishing target section. Depending on the amount of the gas extinguisher to be released, changes in the environment, etc., it can be considered that the environment in which the gas extinguisher is released and the oxygen concentration in the fire extinguishing target section is less than 10% is undesirable for the human body.
JP-A-8-141102 Air Conditioning and Sanitary Engineering Handbook 1 Basics Volume 2 Chapter 3 Volume 2 and 5 Air quality standards and effects of pollutants Page 489-490 November 30, 2001 (Heisei 13) November 13th edition 1st edition issued Japan Society for Air Conditioning and Sanitary Engineering

  In view of the problems in using the above conventional gas fire extinguishing equipment in a special environment, the present invention provides a gas fire extinguishing method in an environmental test equipment that satisfies both the certainty for fire extinguishing and the safety for humans. And its facilities.

In order to achieve the above object, a gas fire extinguishing method in an environmental test facility according to the present invention is a vehicle or an engine prior to being incorporated into a vehicle in a predetermined constant pressure and constant temperature environment corresponding to atmospheric pressure and / or temperature deviating from the standard state. In a gas fire extinguishing method in an environmental test facility equipped with a constant pressure and constant temperature chamber for verifying the operating state of an automobile or an engine in the environment by actually operating the pressure, the pressure of the constant pressure and constant temperature chamber is set at the time of the environmental test. The air supply fan of the dehumidifying unit that dehumidifies and cools the introduced outside air and the exhaust gas generated by the test engine through the exhaust pipe together with the indoor air are changed according to the difference in the air volume. to, in the event of a fire, based on data of the pressure and temperature of the constant圧恒in a greenhouse during environmental testing, the container number to be opened in the gas extinguishant Calculated and, by controlling the discharge amount of the gas fire extinguishing agent by opening a predetermined gas extinguishing agent storage vessel according to the result, 10% oxygen concentration constant圧恒in a greenhouse after release gas extinguishant or more, and characterized to Rukoto to maintain the following extinguishing design concentration.
In this case, when a fire occurs, the air supply fan and the exhaust gas fan of the dehumidifying unit can be stopped.

  In this case, the data of the set pressure and the set temperature and the data of the pressure and the temperature in the constant pressure and constant temperature measured in real time can be used as the pressure and temperature data in the constant pressure and constant temperature chamber.

  Moreover, the atmospheric pressure and temperature data in the constant pressure and constant temperature room are classified so as to belong to any one of a plurality of preset atmospheric pressure ranges and temperature ranges, and based on the classified atmospheric pressure ranges and temperature ranges. Thus, it is possible to control the discharge amount of the gas extinguishing agent.

  In addition, when the atmospheric pressure in the constant pressure and constant temperature chamber is less than or equal to the preset pressure below the atmospheric pressure, when the gas fire extinguishing agent is released, the pressure relief damper is used when the atmospheric pressure in the constant pressure and constant temperature chamber rises to a predetermined pressure above the atmospheric pressure. The pressure relief damper can be closed after a predetermined time after the completion of the release of the gas extinguishing agent.

Moreover, the gas fire extinguishing equipment in the environmental test equipment of the present invention is for carrying out the gas fire extinguishing method in the environmental test equipment , and has a predetermined constant pressure and temperature corresponding to the atmospheric pressure and / or temperature deviating from the standard state. This is a gas fire extinguishing facility in a test environment facility equipped with a constant pressure and constant temperature chamber for verifying the operating state of the vehicle or engine in the environment by actually operating the vehicle or the engine before being incorporated into the vehicle in the environment of During the environmental test, the pressure of the constant temperature and constant temperature chamber is sucked through the exhaust duct device together with the air supply fan of the dehumidification unit that dehumidifies and cools the outside air introduced, and the exhaust gas generated by the test engine through the exhaust pipe through the exhaust duct device. to exhaust fan so as to vary the difference between the respective air volume and, constant圧恒produce greenhouse installation was constant圧恒temperature environment as the target dehumidifier及A control device for sending a control signal of the gas pressure and temperature to the air conditioner, in the event of a fire, based on data of the pressure and temperature of the Fetch been constant圧恒a greenhouse from the controller, to open the gas extinguishant The oxygen in the constant-pressure and constant-temperature chamber after releasing the gas extinguishing agent is calculated by calculating the number of containers and controlling the release amount of the gas extinguishing agent by opening the predetermined gas extinguishing agent storage container according to the result concentration of 10% or more, and characterized by comprising a gas extinguishing systems control panel you to maintain the following extinguishing design concentration.
In this case, when a fire occurs, the air supply fan and the exhaust gas fan of the dehumidifying unit can be stopped.

  In this case, the data of the set pressure and the set temperature and the data of the pressure and the temperature in the constant pressure and constant temperature measured in real time can be used as the pressure and temperature data in the constant pressure and constant temperature chamber.

  In addition, the gas fire extinguishing equipment control panel is provided with a calculation circuit that calculates the classification of whether the atmospheric pressure and temperature data in the constant pressure and constant temperature room belong to either a plurality of preset atmospheric pressure ranges or temperature ranges. Based on the atmospheric pressure range and the air temperature range obtained by the calculation, the discharge amount of the gas extinguishing agent can be controlled.

Moreover, Heng圧恒comprises a避圧damper to prevent greenhouse and indoor instrumentation sealing is broken by the pressure difference between the outside chamber, when pressure in the constant pressure constant greenhouse of pressure below a preset subatmospheric pressure When the gas fire extinguisher is released, the pressure relief damper is opened when the pressure in the constant temperature and constant temperature chamber rises to a predetermined pressure higher than the atmospheric pressure, and the pressure relief damper is closed after a predetermined time after the completion of the gas extinguishing agent release. Can be.

  According to the gas fire extinguishing method and its equipment in the environmental test facility of the present invention, the oxygen concentration in the constant pressure and constant temperature room after releasing the gas fire extinguishing agent is 10% based on the pressure and temperature data in the constant pressure and constant temperature room. By controlling the amount of gas fire extinguishing agent released so that the concentration is kept below the fire extinguishing design concentration above, even in a constant pressure and constant temperature room of an environmental test facility in a special environment, it is released into the constant pressure and constant temperature room The oxygen concentration in the constant pressure and constant temperature chamber can be maintained at an appropriate value by appropriately controlling the amount of gas extinguisher to be extinguished. Therefore, it is possible to satisfy both requirements of fire fighting reliability and safety for human beings.

  In this case, the atmospheric pressure and temperature data in the constant temperature and constant temperature chamber include the set atmospheric pressure and set temperature data, and the atmospheric pressure and temperature data measured in real time in the constant pressure and constant temperature room for the usage and usage conditions of the environmental test facility. It can be appropriately selected and used accordingly.

  Moreover, the atmospheric pressure and temperature data in the constant pressure and constant temperature room are classified so as to belong to any one of a plurality of preset atmospheric pressure ranges and temperature ranges, and based on the classified atmospheric pressure ranges and temperature ranges. Thus, the structure of the gas fire extinguishing equipment can be simplified by controlling the discharge amount of the gas fire extinguishing agent.

  In addition, the gas pressure extinguishing agent is released and the pressure relief damper is opened when the constant pressure and constant temperature chamber reaches a preset pressure, and the gas pressure extinguishing agent is closed after the gas extinguishing agent is released. Prevents damage to the enclosure of the constant pressure and constant temperature chamber due to abnormal rise in the pressure in the constant pressure and constant temperature room while preventing leakage of extinguishing agent and maintaining the oxygen concentration in the constant pressure and constant temperature room at an appropriate value. be able to.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a gas fire extinguishing method and its facilities in an environmental test facility of the present invention will be described with reference to the drawings.

  FIG. 1 shows an example of a gas fire extinguishing method in an environmental test facility of the present invention and an environmental test facility to which the facility is applied, and FIG. 2 shows an example of a gas fire extinguishing facility of the present invention.

  This environmental test facility is used to verify that an automobile and its engine operate stably in the environment without any failure by actually operating the automobile or the engine before being incorporated into the automobile in various environments. For testing.

  In this embodiment, the environmental test facility is commonly provided with a dehumidifying unit 5 for dehumidifying and cooling the introduced outside air when performing a low temperature test, and the outside air taken from the outside air gallery 6 is adjusted to a predetermined dry bulb temperature and dew point temperature. Thus, it is introduced into the vehicle laboratory Ra and the engine laboratory Rb.

In the vehicle laboratory Ra, an air conditioner 7 that can adjust the indoor temperature (dry bulb temperature and dew point temperature) is indoors, and the drive wheels of the test vehicle 8 are actually run in the form of stationary running on rollers. The exhaust pipe 10 of the test vehicle 8 is connected through the exhaust duct device 11 to the exhaust gas fan 10 for exhausting the exhaust gas generated from the exhaust pipe as a result of the test vehicle 8 sucking the room air from the engine intake and performing the internal combustion. Are provided so as to be indirectly connected to each other.
Each fan is provided with an inverter capable of rotating so that the pressure in the vehicle laboratory Ra can be changed by the difference in air volume between the air supply fan and the exhaust gas fan 10 of the dehumidifying unit 5.
The vehicle laboratory Ra includes a temperature sensor TEa that measures the dry bulb temperature, a dew point temperature sensor DPa that measures the dew point temperature, and a pressure sensor Pa that measures the indoor pressure (may be a differential pressure with the outside). The wall surface or the like is also provided with a pressure-proof damper Da that is opened when the pressure exceeds a predetermined set value.

In the engine laboratory Rb, an air conditioner 12 capable of adjusting the room temperature (dry bulb temperature and dew point temperature) is installed in the room, and the test engine 13 is installed on the surface plate 14 so that fuel, cooling water, engine oil, etc. The engine dynamometer 15 that applies a load to the driving shaft of the test engine 13 and absorbs the driving force is supplied into the room, and exhaust gas generated from the exhaust pipe as a result of internal combustion is sucked from the air intake of the test engine 13. The exhaust gas fans 16 for exhausting the exhaust gas are provided so as to be indirectly connected to the exhaust pipe of the test engine 13 via the exhaust duct device 17.
Each fan is provided with an inverter capable of rotating so that the pressure in the engine laboratory Rb can be changed by the difference in air volume between the air supply fan and the exhaust gas fan 16 of the dehumidifying unit 5.
The engine laboratory Rb includes a temperature sensor TEb for measuring the dry bulb temperature, a dew point temperature sensor DPb for measuring the dew point temperature, and a pressure sensor Pb for measuring the indoor pressure (may be a differential pressure with the outside). A wall surface or the like is also provided with a pressure-proof damper Db that is opened when the pressure exceeds a predetermined set value. In the embodiment, the dehumidifying unit 5 is shared by the vehicle experimental room Ra and the engine experimental room Rb. However, in order to increase the degree of freedom of setting of each room, it may be provided individually for each room.

  In the case of the vehicle laboratory Ra, an operator may actually drive the vehicle depending on the vehicle operation mode, and may enter the room. In the case of the engine laboratory Rb, not only the operation from the observation room is performed remotely, but also an operator may enter the room for testing.

  The automatic control panel Pr provided in the observation room or the like includes a test start / stop button for the vehicle laboratory Ra, a test start / stop button for the engine laboratory Rb, a room pressure setting input device and a room temperature setting input device for the vehicle laboratory Ra, A chamber pressure setting input device and a room temperature setting input device of the engine laboratory Rb are provided on the board surface.

Signals * 2a, * 3a, * 2b, * 3b sent from the temperature sensor TEa, dew point temperature sensor DPa, temperature sensor TEb, and dew point temperature sensor DPb in the vehicle laboratory Ra are automatically controlled. The temperature controller circuit TIC provided in the panel Pr is input as an input, and the deviation from the indoor set temperatures of the vehicle laboratory Ra and the engine laboratory Rb set from the outside in the temperature controller circuit TIC is calculated by proportional integral calculation. The result is sent to the controller controller circuit IC in the automatic control panel Pr.
As a result of calculation in the controller controller circuit IC, in relation to the test start / stop button, the fan start / stop signal * 10a of the air conditioner 7, the fan start / stop signal * 10b of the air conditioner 12, and other fan start / stop signals The control valve adjustment signal * 5 to the cooling coil of the dehumidifying unit 5, the control signal * 6 to the dehumidifier, and the air conditioner 7 are incorporated in response to signals emitted from the four types of temperature sensors. Control valve adjustment signal * 7a to the cooling coil, control valve adjustment signal * 8a to the humidifier, control valve adjustment signal * 9a to the heating coil, control valve adjustment signal to the cooling coil built in the air conditioner 12 * 7b, control valve adjustment signal * 8b to the humidifier, and control valve adjustment signal * 9b to the heating coil are transmitted.

The signals * 1a and * 1b sent from the pressure sensor Pa in the vehicle laboratory Ra and the pressure sensor Pb in the engine laboratory Rb are input to the pressure controller circuit PIC provided in the automatic control panel Pr, Deviations from the respective set pressures of the vehicle laboratory Ra and the engine laboratory Rb set in the pressure controller circuit PIC from the outside are proportionally integrated, and the calculation results are sent to the controller controller circuit IC in the automatic control panel Pr. . As a result of calculation in the controller controller circuit IC, the rotational speed control adjustment signal * 4c to the fan of the dehumidifying unit 5 and the rotational speed control adjustment to the exhaust gas fan 10 corresponding to the signals emitted from the two types of pressure sensors. A signal * 4a and a rotation speed control adjustment signal * 4b to the exhaust gas fan 16 are transmitted.
Further, when a predetermined set value set in the pressure controller circuit PIC is exceeded, an open / close signal * 11a of the pressure avoidance damper Da or an open / close signal * 11b of the avoidance damper Db may be transmitted.

  In this way, two constant pressure and constant temperature chambers of the vehicle laboratory Ra and the engine laboratory Rb that can arbitrarily set the atmospheric pressure and temperature in the room are provided.

By the way, when a vehicle or the like is actually operated in the vehicle laboratory Ra and the engine laboratory Rb, it is necessary to install a fire extinguishing equipment because there is a risk of fire, but the vehicle laboratory Ra and the engine laboratory Rb are Since a special environment is formed as a constant pressure and constant temperature chamber, it is necessary to satisfy both certainty for fire extinguishing and safety for humans.
That is, for example, in the case of low pressure, since the density of the gas becomes low, it is necessary to reduce the amount of the gas extinguishing agent released into the fire extinguishing target section from the amount calculated based on the volume of the normal fire extinguishing target section. However, depending on the amount of gas extinguisher to be released and changes in the environment, it is conceivable that the oxygen concentration in the fire extinguishing target area from which the gas extinguisher has been released does not fall below the flame extinguishing concentration and cannot be extinguished.
On the other hand, when the temperature is low, the gas density becomes high, so the amount of the gas extinguishing agent released into the fire extinguishing target section needs to be increased from the amount calculated based on the volume of the normal fire extinguishing target section. Depending on the amount of the gas extinguisher to be released, changes in the environment, etc., it can be considered that the environment in which the gas extinguisher is released and the oxygen concentration in the fire extinguishing target section is less than 10% is undesirable for the human body.

  For this reason, in the present embodiment, the pressure and temperature data of the vehicle laboratory Ra and the engine laboratory Rb, specifically, the set pressure and set temperature data, and the pressure and temperature measured in real time, respectively. The data is extracted, and based on the pressure and temperature data, the oxygen concentration in the room after releasing the gas extinguisher is 10% or more (Fire Fighter No. 102 (March 30, 2001)), and The amount of gas fire extinguishing agent released is controlled so as to maintain the fire extinguishing design concentration or less. Specifically, from the pressure controller circuit PIC of the automatic control panel Pr, the set pressure data, the real-time pressure data obtained by calculating the measurement signals of the pressure sensors Pa, Pb, the set temperature data from the temperature controller circuit TIC, Real-time measurement temperature data obtained by calculating the measurement signals of the temperature sensors TEa, DPa, TEb, and DPb are respectively taken out and sent to the fire extinguishing equipment control panel Pf. Based on the data of the atmospheric pressure and the air temperature by the arithmetic circuit of the fire extinguishing equipment control board Pf The amount of the gas extinguishing agent to be released is controlled so that the oxygen concentration in the room after releasing the gas extinguishing agent is not less than 10% and is not more than the designed extinguishing extinguishing concentration.

  Here, when nitrogen gas is used as a gas extinguishing agent, the oxygen concentration (usually 21%) is reduced to the fire extinguishing design concentration (usually 21%) by releasing the nitrogen gas into the vehicle laboratory Ra and the engine laboratory Rb. The fire can be extinguished by reducing it to 12.5% or less.

  Hereinafter, specific examples will be described while clarifying the calculation contents in the fire extinguishing equipment control panel Pf.

1. Laboratory conditions (1) Laboratory Vehicle laboratory Ra
Engine laboratory Rb
(2) Design specifications Minimum indoor pressure: 430mmHg
Minimum room temperature: -40 ° C

2. Necessary amount of gas extinguishing agent (1) Extinguishing agent coefficient F
The fire extinguishing target is assumed to be an oil fire such as gasoline, and the designed extinguishing agent concentration C is 40.3% multiplied by a safety factor of 1.2 based on the inert gas: n-heptane extinguishing concentration of 33.6%. To do.
The extinguishing agent coefficient F (m ³ / m ³ ) is
F = ln (100 / (100-C)) (20 ° C.) (Formula 1)
Substituting C at room temperature of 20 ° C,
F = 0.52m ³ / ^{m 3}
It becomes.
In addition, assuming the worst fire scenario (normal pressure / low temperature state) as a laboratory condition and considering the minimum set temperature of −40 ° C., when the room temperature is T ° C., the extinguishing agent coefficient F is
F = 0.52 × (273 + 20) / (273 + T) (Formula 2)
Is expressed according to Charles's law, so substitute T = (− 40 ° C.),
F = 0.52 × (273 + 20 ) / (273-40) = 0.654m 3 / m 3 (-40 ℃)
And
Multiplying the extinguishing target volume by the extinguishing agent coefficient F, the required amount G (m ³ ) of the gas extinguishing agent is obtained.
When gas extinguishing agent is sealed in a cylinder, it is generally sealed in a 20.3 m ³ container.
(2) Necessary amount of gas extinguishing agent G (m ³ )
Table 1 shows the required amounts of gas extinguishing agents in one example of the two constant pressure and constant temperature chambers of the vehicle laboratory Ra and the engine laboratory Rb determined in the above calculation process. Up to this point, if the type and chamber of the gas extinguishing agent are determined, the fixed value is obtained. Therefore, it is possible to give the calculation to the fire extinguishing equipment control panel Pf as a given condition.

3. Obtains an extinguishing agent concentration C _{2 (%)} in the case of releasing the required amount G of the calculated gas fire extinguishing agent of oxygen concentration "required amount of gas extinguishing agent" preceding target compartment in laboratory extinguishant concentration C ₂ ( %), The indoor oxygen concentration C ₃ (%) after the extinguishing agent is released is calculated.
C ₃ = 21 × (1−extinguishing agent concentration C ₂ ) (Formula 3)
_{C 2 = [1-exp {} -W 2 / V 1 + ln (1-C 0/100)}] × 100 ··· ( Equation 4)
_{W 2 = W 1 × {(} 273 + T) / (273 + 20)} - V 1 × (1-P / 760) ··· ( Equation 5)
C ₀ = (1−P / 760) × 100 (Expression 6)
Here, W ₁ : Required extinguishing agent amount (m ³ ), V ₁ : Real space volume (m ³ ), T: Minimum indoor temperature (° C.), P: Minimum indoor pressure (mmHg), C ₂ : Extinguishing agent concentration (%), W ₂ : amount of residual fire extinguisher when returning to 1 atm from the start of fire extinguishing agent release (m ³ ) C ₀ : concentration of fire extinguishing agent at the time of returning to 1 atm from the start of fire extinguishing agent release (%) It is.
Table 2 shows the design of the fire extinguishing scenario when the required amount G of the gas fire extinguishing agent is released to the laboratory under the worst conditions using the equations 3 to 6, and the oxygen concentration in other conditions compared. Show.

  From this result, it can be seen that the oxygen concentration is less than 10% when the extinguishing agent is released under low pressure and room temperature conditions.

4). Measures to avoid a decrease in oxygen concentration under low pressure conditions As shown in the previous section, it was found that when the required amount of gas extinguisher calculated under the worst conditions was released at low pressure and normal temperature, the oxygen concentration would fall below 10%. .
For this reason, in order to prevent the oxygen concentration from falling below 10%, the calculation circuit of the fire extinguishing equipment control panel Pf based on the pressure and temperature data of the vehicle laboratory Ra and the engine laboratory Rb, The amount of the gas extinguishing agent to be released (the number of containers to be opened) is controlled so that the oxygen concentration in the room after releasing the extinguishing agent is 10% or more and is kept below the designed extinguishing rate.
Specifically, after reducing the number of open containers and adjusting W ₁ : required extinguishing agent amount (m ³ ) in stages, the indoor oxygen concentration C ₃ is calculated using Equations 3 to 6, Control is performed so that the oxygen concentration in the room is 10% or more and is maintained at or below the fire extinguishing design concentration.
Tables 3 and 4 show the oxygen concentrations when the number of containers to be opened is controlled to release the gas extinguishing agent into the vehicle laboratory Ra and the engine laboratory Rb, respectively.

The vehicle laboratory Ra after releasing the gas extinguishing agent by controlling the amount of gas extinguishing agent to be released (number of containers to be opened) based on the pressure and temperature data of the vehicle laboratory Ra and the engine laboratory Rb. In addition, the oxygen concentration in the engine laboratory Rb can be maintained at a safe concentration for the human body (oxygen concentration: 10.0% or more) and below the fire extinguishing design concentration (oxygen concentration: 12.5% or less). It becomes. More specifically, the arithmetic circuit of fire extinguishing equipment control panel Pf, provided a circuit for calculating the indoor oxygen concentration C ₃ using Equation 3 Equation 6, T: minimum indoor temperature (℃) and P: minimum chamber pressure ( mmHg) is calculated based on the pressure and temperature data of the vehicle laboratory Ra and the engine laboratory Rb.

5. System configuration (1) Start-up method The start-up method of the fire extinguishing equipment is an automatic start-up / manual start-up change-over method, and when personnel enter the vehicle laboratory Ra and the engine laboratory Rb, the manual start-up method is surely switched. Shall.
The activation method is switched by a specific person in charge from an operation box installed in the measurement room (see FIG. 3).

(2) Start-up operation In the case of the automatic start-up method (when a person does not enter the vehicle laboratory Ra and the engine laboratory Rb), the system is started by the operation of the two-line sensor.
In the case of the manual activation method (when a person enters the vehicle laboratory Ra and the engine laboratory Rb), the manual activation device is installed after confirming the evacuation of the personnel in the room and the closing of the door and shutter by a specific person in charge. Do this by operating.

(3) Switching the number of opened containers As described in the previous section, in order to control the amount of gas extinguishing agent released (number of opened containers) based on the pressure and temperature of the vehicle laboratory Ra and the engine laboratory Rb, The pressure and temperature data of the vehicle laboratory Ra and the engine laboratory Rb output from the automatic control panel Pr are received by the fire extinguishing equipment control panel Pf, and the vehicle laboratory Ra and the engine laboratory Rb after releasing the gas extinguisher. Extinguishing gas in an amount that can maintain the oxygen concentration in the room at a safe concentration for humans (oxygen concentration: 10.0% or more) and below the fire extinguishing design concentration (oxygen concentration: 12.5% or less) Release agent (open the number of containers).

  In this case, the atmospheric pressure and temperature data of the vehicle laboratory Ra and the engine laboratory Rb include the set atmospheric pressure and the set temperature data, and the atmospheric pressure and temperature data measured in real time, the vehicle laboratory Ra and the engine laboratory Rb. In accordance with the application, the usage state, etc., the data can be appropriately selected and used. In the present embodiment, the pressure data and the set temperature data measured in real time are used.

  The amount of gas extinguishing agent to be released (number of containers to be opened) can be controlled by using a mechanism similar to the mechanism described in Patent Document 1, for example. In this mechanism, when the activation signal is sent to the solenoid for opening the activation gas container, the activation gas container 1 is opened by operating the solenoid, and the activation gas released thereby is selected by the selection valves 2a, 2b. And the non-return valve 3 (this non-return valve 3 allows gas flow in one direction and opens the gas fire extinguishing agent storage container 4 in the opposite direction), and extinguishes the gas. The agent storage container 4 is opened (see FIG. 2).

The amount of gas extinguisher to be released (number of open containers) is controlled by the fact that the oxygen concentration in the vehicle laboratory Ra and the engine laboratory Rb when the gas extinguisher is released is 10% or more and the fire extinguishing is performed. Any method can be adopted as long as it can maintain the design concentration or less. For example, in the above embodiment, the amount of the gas extinguisher released in the section as shown in FIG. (The number of containers to be opened) is controlled, but in addition to this, as shown in FIG. 4A, the air pressure and the air temperature in the vehicle laboratory Ra and the engine laboratory Rb are set in advance, respectively. Classification (In this embodiment, the atmospheric pressure is divided into two sections, the temperature is divided into three sections, and the whole is divided into three sections. However, the way of classification (the range and number of classifications) is not limited to that of this embodiment. Can be set as appropriate ) Are classified as belonging to one of the pressure range and temperature range comprised from, based on the classified pressure range and temperature range, it is possible to control the amount of released gases extinguishing agent (container number to open).
Thereby, it is possible to accurately control the amount of gas extinguishing agent to be released (the number of open containers) while simplifying the structure of the gas fire extinguishing equipment.

(4) Safety measures ・ The inner door (the door on the vehicle laboratory Ra side) of the evacuation room (the room for evacuating personnel from the low-pressure laboratory) provided in the vehicle laboratory Ra is open during the experiment. Therefore, the evacuation chamber shall be included in the protection compartment volume. However, no ejection head is provided in the evacuation chamber.
A window is installed in each chamber so that the vehicle laboratory Ra, the engine laboratory Rb, the front chamber, and the evacuation chamber can be easily checked from the measurement room.
-For the toilets in the vehicle laboratory Ra, install a speaker that operates when the fire extinguishing equipment is activated to encourage the personnel in the toilet to evacuate.

6). Retraction mechanism When the protective compartment is a completely sealed compartment, the pressure rises to about 1.6 atm when the extinguishing agent is released. Therefore, the vehicle laboratory Ra and the engine laboratory Rb have pressure relief measures, specifically a pressure relief damper. A pressure avoiding mechanism including Da and Db is provided.
In this case, when a fire occurs in the vehicle laboratory Ra and the engine laboratory Rb in a low pressure state, when the gas pressure extinguishing dampers Da and Db are opened simultaneously with the release of the gas fire extinguishing agent, the flow of air from the outside changes. Since there is a risk of fire, the pressure relief dampers Da and Db are opened after the room pressure has recovered to 1 atmosphere or more.
For this reason, the opening control of the pressure avoidance dampers Da and Db is performed from the automatic control panel Pr. When the indoor pressure reaches a set pressure of 1 atm or more (for example, 2000 Pa or more), the pressure avoidance dampers Da and Db are opened, and the gas After a predetermined time after the completion of the release of the extinguishing agent (in this embodiment, since the release of the gas extinguishing agent is completed within a few tens of seconds from the start of the emission of the gas extinguishing agent, one minute after the start of the release of the gas extinguishing agent) Try to close. This is because the extinguishing agent release signal * A of the vehicle laboratory Ra and the extinguishing agent release signal * B of the engine laboratory Rb emitted from the fire extinguishing equipment control panel Pf shown in FIG. And the operation controller controller IC performs arithmetic control to transmit the open / close signal * 11a of the pressure avoidance damper Da or the open / close signal * 11b of the pressure avoidance damper Db.
Thereby, while preventing leakage of the gas extinguishing agent from the vehicle laboratory Ra and the engine laboratory Rb and maintaining the oxygen concentration in the vehicle laboratory Ra and the engine laboratory Rb at appropriate values, the vehicle laboratory Ra and It is possible to prevent the vehicle laboratory Ra and the engine laboratory Rb from being damaged due to an abnormal increase in the pressure in the engine laboratory Rb.
In addition, Table 5 shows an effective opening area necessary for pressure avoidance.

7). Safety for humans As for safety for humans, as described above, it is possible to secure an oxygen concentration of 10% or more. However, in principle, the vehicle laboratory Ra and the engine laboratory Rb are unattended when the fire extinguishing equipment is activated. Switching to the manual activation method when a person enters the room, personnel at the time of manual activation by the manual activation device Confirmation of evacuation needs to be carried out reliably.

  The gas fire extinguishing method and its equipment in the environmental test equipment of the present invention have been described based on the embodiments, but the present invention is not limited to the configurations described in the above embodiments, and departs from the spirit thereof The configuration can be appropriately changed within a range not to be performed.

  Since the gas fire extinguishing method and its equipment in the environmental test facility of the present invention satisfy both the certainty for fire extinguishing and the safety for humans, various environments in which a person may enter and work indoors. By using the vehicle and its engine under actual operation under the environment, it should be used suitably for environmental test facilities for performing tests to verify that the vehicle and its engine operate stably without failure. In addition, it can be used for a wide range of general environmental test facilities, for example.

It is explanatory drawing which shows one Example of the environmental test equipment which applies the gas fire extinguishing method in the environmental test equipment of this invention, and its equipment. It is explanatory drawing which shows one Example of the gas type fire extinguishing equipment in the environmental test equipment of this invention. It is a flowchart of the gas fire extinguishing method in the environmental test equipment of the present invention. It is explanatory drawing which shows the control method of the quantity of gas extinguishing agents to discharge | release (the number of containers opened) in the gas fire extinguishing method in the environmental test equipment of this invention.

Explanation of symbols

Ra vehicle laboratory (constant pressure and constant temperature room)
Rb engine laboratory (constant pressure and constant temperature room)
Da avoidance damper Db avoidance damper Pr automatic control panel Pf fire extinguishing equipment control panel 1 start gas container 2a selection valve 2b selection valve 3 non-return valve 4 gas extinguishing agent storage container

Claims (12)

In order to verify the operating state of the automobile or engine in the environment by actually operating the automobile or the engine before being incorporated in the automobile in an environment of a predetermined constant pressure and temperature corresponding to the atmospheric pressure and / or temperature deviating from the standard state. In the gas fire extinguishing method in the environmental test facility equipped with a constant pressure and constant temperature chamber, the pressure of the constant pressure and constant temperature chamber is set to a dehumidifying unit air supply fan for dehumidifying and cooling the introduced outside air during the environmental test, and the test engine is connected to the exhaust pipe. The exhaust gas generated through the air is changed by the difference in air volume with the exhaust air fan sucked through the exhaust duct device together with the room air, and in the event of a fire , data on the atmospheric pressure and temperature in the constant pressure and constant temperature chamber during the environmental test based on, by calculating the vessel number to be opened for a gas fire extinguisher to open a predetermined gas extinguishing agent storage vessel in accordance with the result By controlling the release of scan extinguishing agent, and characterized in that the oxygen concentration constant圧恒in a greenhouse after release gas fire extinguishing agent 10% or more, and a to Rukoto to maintain the following extinguishing design concentration Gas fire extinguishing method in the environmental test facility. 2. The gas fire extinguishing method in an environmental test facility according to claim 1, wherein an air supply fan and the exhaust gas fan of the dehumidifying unit are stopped when a fire occurs. The gas fire extinguishing method in an environmental test facility according to claim 1 or 2 , wherein data of a set atmospheric pressure and a set temperature is used as data on the atmospheric pressure and temperature in the constant pressure and constant temperature room. The gas fire extinguishing method in an environmental test facility according to claim 1 or 2 , wherein the pressure and temperature data in the constant pressure and constant temperature room measured in real time are used for the pressure and temperature data in the constant pressure and constant temperature room. The atmospheric pressure and temperature data in the constant temperature and constant temperature room are classified so as to belong to any one of a plurality of preset atmospheric pressure ranges and temperature ranges, and based on the classified atmospheric pressure range and temperature range, The gas fire extinguishing method in an environmental test facility according to claim 1, 2 , 3 or 4 , characterized in that the release amount of the gas fire extinguishing agent is controlled. When the atmospheric pressure in the constant temperature and constant temperature chamber is below the preset pressure below the atmospheric pressure, the pressure relief damper is opened when the pressure inside the constant pressure and constant temperature chamber rises to a predetermined pressure above the atmospheric pressure when releasing the gas extinguishing agent. and, according to claim 1, 2, 3, the gas-based fire extinguishing method in environmental test equipment 4 or 5, wherein the to be closed避圧damper after a predetermined time after completion of release of gas extinguishing agents. In order to verify the operating state of the automobile or engine in the environment by actually operating the automobile or the engine before being incorporated in the automobile in an environment of a predetermined constant pressure and temperature corresponding to the atmospheric pressure and / or temperature deviating from the standard state. A gas fire extinguishing facility in a test environment facility equipped with a constant pressure and constant temperature chamber , wherein the constant pressure and constant temperature chamber is configured to have a dehumidifying unit air supply fan that dehumidifies and cools the outside air during an environmental test, and a test engine. Create a constant-pressure and constant-temperature environment for a constant-pressure and constant-temperature room that changes the exhaust gas generated through the exhaust pipe according to the difference in air volume between the exhaust air fan and the exhaust air that is sucked through the exhaust duct device together with the room air. a control device for sending a control signal of the gas pressure and temperature to the dehumidifier and the air conditioner, in the event of a fire, the control device from the Fetch been constant圧恒greenhouse of Based on the data of pressure and temperature, it calculates the open container number should be a gas extinguishing agent, by controlling the discharge amount of the gas fire extinguishing agent by opening a predetermined gas extinguishing agent storage vessel in accordance with the result , environmental test, characterized in that the oxygen concentration constant圧恒in a greenhouse after release gas fire extinguishing agent at least 10%, and having a gas extinguishing systems control panel you to maintain the following extinguishing design concentration Gas fire extinguishing equipment in equipment. 8. The gas fire extinguishing equipment in an environmental test facility according to claim 7, wherein an air supply fan and the exhaust gas fan of the dehumidifying unit are stopped when a fire occurs. The gas fire extinguishing equipment in an environmental test facility according to claim 7 or 8, wherein the data on the set atmospheric pressure and the set temperature set in the control device is used for the data on the atmospheric pressure and temperature in the constant pressure and constant temperature chamber. The gas fire extinguishing equipment in an environmental test facility according to claim 7 or 8 , wherein the pressure and temperature data in the constant pressure and constant temperature room measured in real time are used for the data on the atmospheric pressure and temperature in the constant pressure and constant temperature room. The gas fire extinguishing equipment control panel is equipped with an arithmetic circuit that calculates whether the atmospheric pressure and temperature data in the constant temperature and constant temperature room belong to either the atmospheric pressure range or the air temperature range that are set in advance. The gas fire extinguishing equipment in an environmental test equipment according to claim 7 , 8, 9, or 10 , wherein the release amount of the gas fire extinguishing agent is controlled on the basis of the atmospheric pressure range and the air temperature range obtained in step (1). Heng圧恒comprising a避圧damper to prevent greenhouse and indoor instrumentation sealing is broken by the pressure difference between the outside chamber, when pressure in the constant pressure constant greenhouse of pressure below a preset subatmospheric pressure, gas The pressure relief damper is opened when the pressure in the constant temperature and constant temperature chamber rises to a predetermined pressure higher than the atmospheric pressure when the extinguishing agent is released, and the avoidance damper is closed after a predetermined time after the release of the gas extinguishing agent. The gas fire extinguishing equipment in the environmental test equipment according to claim 7 , 8 , 9, 10 or 11.

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