JP2018057576A - Air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning device capable of forming and maintaining an indoor environment where a human can breathe and a combustible object cannot be burned by controlling oxygen concentration and carbon dioxide concentration continuously.SOLUTION: An air conditioning device 1 for conditioning an air component in a room 2 where a human enters and exits from includes first gas containing at least carbon dioxide and inert gas, second gas containing at least oxygen, a conduit line 20 for supplying the first gas and the second gas inside the room, first and second control valves 31 and 32 for controlling flow of the first gas and the second gas, a first sensor 41 for detecting oxygen concentration in the room 2, a second sensor 42 for detecting carbon dioxide concentration in the room 2, and control means 51 for maintaining the oxygen concentration in the room 2 in the range of 12-14%, and maintaining the carbon dioxide concentration in the room in the range of 3-4% by controlling the first and second control valves 31 and 32 based on detection results by the first and second sensors 41 and 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioner that adjusts indoor air components to and from which humans enter and exit, and in particular, an indoor environment in which humans can breathe and combustibles cannot be burned by continuously controlling oxygen concentration and carbon dioxide concentration. It is related with the air-conditioning apparatus to maintain.

  The present applicant provides, for example, a sprinkler facility, a bubble fire extinguishing facility, a carbon dioxide fire extinguishing facility, an inert gas fire extinguishing facility, and the like as a fire extinguishing facility for a building or a plant. All conventional fire extinguishing equipment is configured to automatically or manually start after a fire has occurred, and fire water, fire extinguishing foam, or fire extinguishing gas is discharged to the fire site (see Patent Documents 1 to 5 and 7). ).

  Among these, Patent Document 1 discloses a fire extinguishing gas composed of carbon dioxide and an inert gas, which was invented by Dr. Lambertsen in the United States. Of this fire extinguishing gas, a mixture of 52% nitrogen, 40% argon and 8% carbon dioxide is called Inagen (registered trademark) gas. Hereinafter, Inagen (registered trademark) gas is referred to as “IG-541”. IG-541 is composed of components contained in the atmosphere, and lowers the oxygen concentration in the air to 12-14% and raises the carbon dioxide concentration to 3-4%. Asphyxia that simply reduces the oxygen concentration is a danger to the human body. On the other hand, in IG-541, the respiratory center of the brain is stimulated by 3 to 4% carbon dioxide, the respiration volume and the blood volume increase, and the oxygen supply amount to the brain is ensured. Thereby, normal evacuation action can be taken in the fire spot after fire extinguishing gas is emitted.

JP-A 64-58272 JP-A-8-173565 JP-A-9-276428 JP 11-267240 A JP 2002-752 A Special table 2003-530922 gazette Special table 2010-534543 gazette

  Since IG-541 is an inert gas composed of components contained in the atmosphere, it can be extinguished without fouling the container. For this reason, the applicant has strongly recommended that fire extinguishing equipment using IG-541 is applied to special protected areas such as museums, art galleries, and important cultural properties.

  However, the fire extinguishing equipment is started after a fire has occurred, and even if a quick fire extinguishing is performed by IG-541, it is impossible to completely eliminate the damage caused by the fire. For example, museums and art museum exhibits and important cultural properties themselves can be the source of fire, and it is not possible to eliminate the damage caused by partial burnout and smoke. In addition, there may be secondary damage in which people evacuating from the fire site are accidentally damaged.

  In the first place, the act of “fire extinguishing” itself is performed for the fire that has already occurred, and it is impossible to eliminate even the damage immediately after the fire occurs by “fire extinguishing”. In other words, no matter how excellent the fire extinguishing gas is, the protected area before the fire extinguishing gas is released is an air component in which combustibles can burn, and is an environment where a fire can occur at any time.

  Here, FIG. 1 of Patent Document 3 discloses a fire prevention and fire extinguishing method in which the indoor oxygen concentration is reduced to 15 to 20% in advance and a gas-based fire extinguisher is released in the event of a fire. Further, FIG. 4 of Patent Document 6 discloses a manned public facility that requires a high level of fire prevention, in which the indoor oxygen concentration is maintained at 12 to 15% by a low oxygen generator.

  However, in the method of Patent Document 3, the indoor oxygen concentration of 15 to 20% is relatively high and there is no problem in the health of the human body, but the effect of preventing the occurrence of fire is extremely low. On the other hand, the facility of Patent Document 6 has a relatively low indoor oxygen concentration of 12 to 15% and is highly effective in preventing the occurrence of a fire, but there is a risk that it will interfere with human health. Here, Patent Document 6 describes the respiration promotion effect of carbon dioxide, but does not describe specific means for applying this and control processing.

  Furthermore, in the method of Patent Document 3, oxygen is exhausted to the outside by an oxygen enricher, and the oxygen concentration is maintained at 15 to 20%. On the other hand, the facility of Patent Document 6 generates low oxygen gas by a low oxygen generator and supplies this low oxygen gas into the room to maintain the oxygen concentration at 12 to 15%. As described above, the methods and facilities of Patent Documents 3 and 6 both control the oxygen concentration only by the device that reduces the oxygen concentration in the room, and specific means and control when the oxygen concentration becomes too low. The processing is not described.

  The present invention has been made in view of the above problems, and can continuously control the oxygen concentration and the carbon dioxide concentration to form and maintain an indoor environment in which humans can breathe and cannot burn combustibles. The object is to provide a possible air conditioning device.

(1) In order to achieve the above object, an air conditioner according to a first aspect of the present invention is an air conditioner that adjusts an air component in and out of a room where a person enters and exits, and includes at least carbon dioxide and an inert gas. 1 gas, a second gas containing at least oxygen, a conduit for supplying the first and second gases into the chamber, and at least one control for controlling the flow of the first and second gases Based on the detection results of the valve, the first sensor for detecting the oxygen concentration in the room, the second sensor for detecting the carbon dioxide concentration in the room, and the detection results of the first and second sensors Control means for controlling the valve to maintain the oxygen concentration in the room within a range of 12 to 14% and to maintain the carbon dioxide concentration in the room within a range of 3 to 4%. is there.

  According to the configuration of (1) above, it is possible to maintain the oxygen concentration in the room, which is the protection target section, in the range of 12 to 14%, and to maintain the carbon dioxide concentration in the range of 3 to 4%. As a result, it is possible to form and maintain an indoor environment in which humans can breathe and cannot burn combustible materials, and it is possible to prevent fires from occurring. In other words, there is absolutely no damage from fire.

(2) In the air conditioner of (1) above, the control means controls the control valve and starts supplying the first gas into the room, and at least a) a detection result of the first sensor Based on the above, it is determined whether or not the oxygen concentration is 12% or less, and if it is determined that the oxygen concentration is 12% or less, the control valve is controlled to supply the first gas into the room. Stop and supply the second gas into the room, b) based on the detection result of the second sensor, whether or not the carbon dioxide concentration is not less than a value within the range of 3.5 to 3.9%. If it is determined that the carbon dioxide concentration is not less than 3.5 to 3.9%, the control valve is controlled to stop the supply of the first gas into the room. Supplying the second gas into the chamber, c) based on the detection result of the first sensor, When it is determined whether or not the concentration is not less than a value within the range of 13.1 to 13.9% and the oxygen concentration is not less than the value within the range of 13.1 to 13.9%, the control is performed. Controlling the valve to stop the supply of the second gas into the room and supplying the first gas into the room; d) based on the detection result of the second sensor, the carbon dioxide concentration is 3 When the carbon dioxide concentration is determined to be 3% or less, the control valve is controlled to stop the supply of the second gas into the room, and the room It may be configured to execute control including supplying the first gas.

  According to the configuration of (2) above, the indoor oxygen concentration can be accurately maintained within a range of 12 to 14%, and the indoor carbon dioxide concentration can be accurately maintained within a range of 3 to 4%. be able to. As a result, it is possible to effectively suppress the combustion of combustible materials while exhibiting the breathing promotion effect of carbon dioxide in the room.

(3) Preferably, in the air conditioning apparatus according to (1) or (2), the first gas is IG-541 in which 52% nitrogen, 40% argon, and 8% carbon dioxide are mixed. Good.

  According to the configuration of (3) above, the commercially available IG-541 is used as it is, and the indoor oxygen concentration is within the range of 12 to 14%, and at the same time, the carbon dioxide concentration is within the range of 3 to 4%. Can be. Therefore, when the IG-541 is used, it is relatively easy to form and maintain an indoor environment in which humans can breathe and cannot burn combustibles.

(4) Preferably, in the air conditioner according to any one of (1) to (3), the second gas may be air.

  According to the configuration (4), the configuration for supplying the second gas into the room can be extremely simplified, and the safety of the air conditioner can be greatly improved. That is, it is conceivable to supply pure oxygen as the second gas into the room, but pure oxygen is harmful to the human body and may cause a fire or explosion. For this reason, the structure of an apparatus becomes complicated by the necessity of ensuring safety | security. Therefore, if air containing oxygen is used as the second gas, the safety of the apparatus becomes extremely high and the configuration becomes simple.

(5) Preferably, in the air conditioning apparatus according to any one of the above (1) to (4), the interior of the room may be maintained at a positive pressure by the supply of the first gas.

  According to the configuration (5), it is difficult for outdoor air to enter the room, and accurate control of the oxygen concentration and the carbon dioxide concentration is facilitated.

(6) Preferably, in the air conditioning apparatus according to any one of (1) to (5), an air circulator is provided in the room.

  According to the configuration of (6) above, the indoor air component can be made uniform, and the oxygen concentration and the carbon dioxide concentration can be detected and controlled more accurately.

(7) In order to achieve the above object, an air conditioner according to a second aspect of the present invention is an air conditioner that adjusts an air component in and out of a room where a person enters and exits, and includes at least carbon dioxide and an inert gas. A pipe for supplying one gas into the room, at least one control valve for controlling the flow of the first gas, a first sensor for detecting the oxygen concentration in the room, The control valve is controlled based on detection results of the second sensor for detecting the carbon dioxide concentration, the third sensor for detecting the atmospheric pressure difference between the room and the outdoor, and the first and second sensors. Thus, the oxygen concentration in the room is maintained in the range of 12 to 14%, the carbon dioxide concentration in the room is maintained in the range of 3 to 4%, and based on the detection result of the third sensor. , The atmospheric pressure in the room Maintaining the same or 1~2000Pa high positive pressure and serial outdoor pressure includes a control unit, and it is constituted.

  According to the configuration of (7) above, the inflow of outside air into the room that is the protection target section is reduced, the oxygen concentration in the room is maintained within the range of 12 to 14%, and the carbon dioxide concentration is 3 to 4%. Can be maintained within the range. As a result, it is possible to form and maintain an indoor environment in which humans can breathe and cannot burn combustible materials, and it is possible to prevent fires from occurring. In other words, there is absolutely no damage from fire. Further, as compared with the configuration (1), it is possible to simplify the equipment for supplying the second gas into the room.

(8) Preferably, in the air conditioning apparatus according to any one of the above (1) to (7), a fire detector installed in the room, a fire notification means, and a second control means different from the control means The second control means notifies the occurrence of a fire by the notification means when receiving a signal from the fire detector, and prioritizes the control of the control means. It is preferable that the control valve is opened and the first gas is continuously discharged into the room for a predetermined time.

  According to the configuration of (8) above, a double fire prevention measure is taken, that is, the prevention of fire by the control means and the rapid fire extinguishing after the fire occurrence by the second control means. For example, if the control of the oxygen concentration and the carbon dioxide concentration by the control means is not executed intentionally or due to a failure, even if a fire should occur, the second control means notifies the occurrence of the fire, The first gas is released to extinguish the fire quickly.

  According to the present invention, it is possible to continuously control the oxygen concentration and the carbon dioxide concentration to form and maintain an indoor environment in which a human can breathe and cannot burn combustibles.

FIG. 1 is a block diagram showing an air conditioner according to an embodiment of the present invention. Fig.2 (a) is explanatory drawing which shows the component ratio of 1st gas (IG-541). FIG. 2B is an explanatory diagram showing the component ratio of air in the protection target section (inside the room) after the first gas is released. FIG. 2C is an explanatory diagram showing a general atmospheric component ratio. FIG. 3 is a flowchart showing air adjustment control by the first control means. FIG. 4 is a flowchart showing fire extinguishing control by the second control means.

  Next, an air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

<Device configuration>
FIG. 1 shows a configuration of an air conditioning apparatus 1 according to the present embodiment. The air conditioner 1 adjusts an air component in the room 2 that is a protection target section. The air conditioner 1 is, for example, an indoor parking lot, a central monitoring room, a generator room, a machine room, a communication equipment room, a computer room, a data processing room, an article display room, a museum, an art museum, an important cultural property, a material storage room, It will be installed in data exhibition rooms, archives, safes, dangerous goods warehouses, painting booths, paint warehouses, power substations, thermal and nuclear power plants, etc.

  The air conditioner 1 includes a first gas unit 11, a second gas unit 12, a pipe line 20, a plurality of injection heads 21, a first control valve 31, a second control valve 32, a first sensor 41, a second sensor 42, A first control unit 51, a second control unit 52, an air circulator 60, a fire detector 71, a speaker 72 as a notification unit, and a pressure avoidance port 73 are included.

  The first gas unit 11 includes a plurality of gas cylinders filled with the first gas. The first gas includes at least carbon dioxide and an inert gas. The first gas can be generated by mixing a small amount of carbon dioxide with an inert gas that is harmless to the human body. In this embodiment, commercially available IG-541 is applied as it is as the first gas. Such a first gas is used to lower the oxygen concentration in the room 2 and increase the carbon dioxide concentration.

  The second gas unit 12 includes a plurality of gas cylinders filled with the second gas. The second gas contains at least oxygen. The second gas may be pure oxygen or a mixed gas of oxygen and other components that are harmless to the human body. In this embodiment, air is applied as the second gas. Pure oxygen is harmful to the human body and is a dangerous material that can cause fire and explosion. For this reason, handling of pure oxygen is extremely difficult. In contrast, air is harmless to the human body and has no danger. By using the second gas as air, the safety of the air conditioner 1 is extremely high, and the configuration of the device is simplified. Such a second gas is used to increase the oxygen concentration in the room 2 and decrease the carbon dioxide concentration. That is, the second gas is used for adjustment for maintaining the oxygen concentration and the carbon dioxide concentration within predetermined ranges.

  Here, a solid line with a reference numeral 20 in FIG. 1 indicates a pipeline through which the first and second gases flow. The first and second gas units 11 and 12 are respectively connected to one end side of the pipe 20 that branches into two. Moreover, the 1st and 2nd control valves 31 and 32 are connected to the one end side branched into two of the pipe lines 20, respectively. The first control valve 31 controls the flow of the first gas from the first gas unit 11. The second control valve 32 controls the flow of the second gas from the second gas unit 12. The first and second gases selectively flow through the pipe line 20 and are supplied to the room 2 depending on the open / close state of the first and second control valves 31 and 32.

  The other end side of the pipe line 20 is disposed near the ceiling of the room 2. A plurality of ejection heads 21 are provided on the other end side of the pipe line 20. The first or second gas flowing through the pipe line 20 is effectively discharged into the chamber 2 through each ejection head 21. Thereby, the oxygen concentration and the carbon dioxide concentration in the room 2 are adjusted. In the room 2, first and second sensors 41 and 42 are provided. The first sensor 41 detects the oxygen concentration in the room 2. The second sensor 42 detects the carbon dioxide concentration in the room 2.

  The first control means 51 is electrically connected to the first and second control valves 31 and 32 and the first and second sensors 41 and 42. Here, the dotted line in FIG. 1 shows the electric wire for transmitting / receiving a signal. The first control means 51 opens and closes the first and second control valves 31 and 32 based on the detection results of the first and second sensors 41 and 42. The first control means 51 of the present embodiment is configured so that the oxygen concentration in the room 2 is maintained within a range of 12 to 14% and the carbon dioxide concentration is maintained within a range of 3 to 4%. The opening and closing of the second control valves 31 and 32 is controlled. As a result, it is possible to form and maintain an indoor environment in which humans can breathe and cannot burn combustible materials, and it is possible to prevent fires from occurring. The control process of the first control means 51 will be described in detail later.

  Here, in this embodiment, the lower limit of the oxygen concentration in the control process of the first control means 51 is 12%, the upper limit of the oxygen concentration is 13.9%, the lower limit of the carbon dioxide concentration is 3%, and the upper limit of the carbon dioxide concentration Is set to 3.9%. Based on these thresholds, the first control means 51 controls the opening and closing of the first and second control valves 31, 32, so that the oxygen concentration in the room 2 is accurately maintained within a range of 12 to 14%, In addition, the carbon dioxide concentration is accurately maintained within a range of 3 to 4%.

  The reason why the lower limit of the oxygen concentration is set to 12% is that, as the oxygen concentration in the room 2 is lower than 12%, the adverse effect on the human body increases. Moreover, the upper limit of oxygen concentration can be made into the value within the range of 13.1 to 13.9%. In this embodiment, the reason why the upper limit of the oxygen concentration is set to 13.9% is to reduce the frequency of the control process and stabilize the control process. On the contrary, when the upper limit of the oxygen concentration is set to 13.1%, the frequency of the control process is increased, and the oxygen concentration in the room 2 is controlled so as not to exceed 14% more reliably. Therefore, when the upper limit of the oxygen concentration is set to 13.5%, both stability and accuracy of the control process can be achieved. When the oxygen concentration in the room 2 becomes 15% or more, the combustible material in the room 2 can be burned.

  On the other hand, the reason why the lower limit of the carbon dioxide concentration is set to 3% is that the carbon dioxide concentration in the room 2 is not lower than 2.5% in consideration of the time lag from the start of the control process until the concentration recovers. It is for doing so. This is because, as the carbon dioxide concentration in the room 2 is lower than 2.5%, the respiration promoting effect of carbon dioxide is reduced or not exhibited. Further, the upper limit of the carbon dioxide concentration can be set to a value within the range of 3.5 to 3.9%. In the present embodiment, the reason why the upper limit of the carbon dioxide concentration is set to 3.9% is to reduce the frequency of the control process and stabilize the control process. On the contrary, when the upper limit of the carbon dioxide concentration is set to 3.5%, the frequency of control processing is increased, and the carbon dioxide concentration in the room 2 is controlled so as not to exceed 4% more reliably. . Therefore, when the upper limit of the carbon dioxide concentration is set to 3.7%, both stability and accuracy of the control process can be achieved. When the carbon dioxide concentration in the room 2 exceeds 4%, the body adapts to the increase in carbon dioxide, and the respiratory promoting effect is not exhibited.

  An air circulator 60 is provided in the room 2. The air circulator 60 generates wind in the room 2 and circulates the air in the room 2. Thereby, the air component in the room 2 can be made uniform, and the oxygen concentration and the carbon dioxide concentration can be detected and controlled more accurately.

  The second control means 52 is electrically connected to the first and second control valves 31, 32, the fire detector 71, and the speaker 72 which is a notification means. When the second control means 52 receives a signal from the fire detector 71, the second control means 52 notifies the occurrence of a fire through the speaker 72 and opens the first control valve 31 in preference to the control of the first control means 51, The first gas is continuously released into the room 2 for a predetermined time. That is, the above-described first control unit 51 always executes control for adjusting the air component in the room 2, whereas the second control unit 52 performs control related to fire extinguishing and notification only in the event of a fire. Execute. The control process of the second control means 52 will be described in detail later.

  The pressure avoidance port 73 is opened when the pressure in the room 2 exceeds a predetermined value, and avoids excessive pressure in the room 2. That is, in the present embodiment, the chamber 2 is maintained at 0 Pa (atmospheric pressure) or a positive pressure in the range of 1 to 2000 Pa mainly by supplying the first gas. The pressure avoidance port 73 is opened when the pressure in the room 2 exceeds 2000 Pa. Thereby, an excessive pressure in the room 2 is avoided, and damage to the window glass and the wall is prevented.

  Here, it is good also as a structure which provides the 3rd sensor which is not shown in figure for detecting the atmospheric | air pressure difference between the room 2 and the outdoor. This third sensor is connected to the first control means 51. Based on the detection result of the third sensor, the first control means 51 maintains the atmospheric pressure in the room 2 at a positive pressure that is the same as the outdoor atmospheric pressure or higher by 1 to 2000 Pa. For example, the first control means 51 opens the first and / or second control valves 31 and 32 and the first gas and / or the second gas in the room 2 when the pressure difference between the room 2 and the room is below 0 Pa. Supply. Here, it is preferable that the atmospheric | air pressure difference which the 1st control means 51 performs a control process shall be a value within the range of 5-20 Pa. When the lower limit value of this atmospheric pressure difference is set to 10 Pa, it is possible to control the atmospheric pressure in the room 2 not to be negative but to be maintained at positive pressure. Further, when the lower limit value of the atmospheric pressure difference is set to 5 Pa, the frequency at which the control process is performed is reduced, and the control process can be stabilized. If the upper limit value of the atmospheric pressure difference is set to 20 Pa, the atmospheric pressure in the room 2 can be controlled without increasing the gas supply amount.

<Indoor air components>
Next, the air component in the room 2 adjusted by the air conditioner 1 of the present embodiment will be described with reference to FIGS.

  FIG. 2A shows the component ratio of the first gas (IG-541) supplied from the first gas unit 11. The first gas of this embodiment is composed of 52% nitrogen, 40% argon, and 8% carbon dioxide. When such a first gas is supplied into the room 2, the component ratio of air in the room 2 is 70% nitrogen, 14% argon, 12% oxygen, and 4% carbon dioxide, as shown in FIG. Become. FIG. 2C shows the component ratio of air (general atmosphere) before the first gas is supplied into the room 2.

  As shown in FIG. 2B, when the oxygen concentration in the air in the room 2 is reduced to 12 to 13%, combustibles cannot be combusted in the room 2. Further, when the carbon dioxide concentration in the air in the room 2 increases to 3 to 4%, the action of promoting carbon dioxide's lung ventilation and the action of cerebral vasodilation are exhibited in the room 2. As a result, the respiratory center of the brain is stimulated, the respiratory volume and the blood volume increase, and a sufficient oxygen supply amount to the brain is ensured. As a result, in the room 2, a human can breathe and can take a normal action.

<Air adjustment control>
Next, air adjustment control by the first control means 51 will be described with reference to FIG. 3 is executed, the oxygen concentration in the room 2 is maintained in the range of 12 to 14%, and the carbon dioxide concentration is maintained in the range of 3 to 4%. In addition, the air conditioner 1 of this embodiment can also perform supply of 1st gas or 2nd gas, and supply stop by manual operation of an operator.

  When the air conditioner 1 of the present embodiment is activated, the first control means 51 opens the first control valve 31 and starts supplying the first gas into the room 2 (step S1). When the supply of the first gas is started, the air in the room 2 becomes close to the component ratio shown in FIG.

  Next, the process proceeds to step S <b> 2, and the first control unit 51 determines whether the oxygen concentration in the room 2 is 12% or less based on the detection result of the first sensor 41. When it is determined that the oxygen concentration is 12% or less (YES), the first control means 51 closes the first control valve 31 and stops the supply of the first gas to the room 2 (step S3). And the 1st control means 51 opens the 2nd control valve 32, and supplies 2nd gas to the room | chamber interior 2 (step S4). Then, it returns to step S2 and repeats the process after step S2.

  On the other hand, if it is determined in step S2 that the oxygen concentration is not 12% or less (NO), the first control unit 51 proceeds to step S5, and the carbon dioxide concentration is 3. based on the detection result of the second sensor 42. Judge whether it is 5% or more. When it is determined that the carbon dioxide concentration is 3.5% or more (YES), the first control means 51 closes the first control valve 31 and stops the supply of the first gas to the room 2 (step S3). . And the 1st control means 51 opens the 2nd control valve 32, and supplies 2nd gas to the room | chamber interior 2 (step S4). Then, it returns to step S2 and the 1st control means 51 repeats the process after step S2.

  On the other hand, when it is determined in step S5 that the carbon dioxide concentration is not 3.9% or more (NO), the first control unit 51 proceeds to step S6, and the oxygen concentration is determined based on the detection result of the first sensor 41. It is judged whether it is 13.9% or more. When it is determined that the oxygen concentration is 13.9% or more (YES), the first control unit 51 closes the second control valve 32 and stops the supply of the second gas into the room 2 (step S7). Then, the first control valve 31 is opened to supply the first gas to the room 2 (step S8). Then, it returns to step S2 and repeats the process after step S2.

  On the other hand, when it is determined in step S6 that the oxygen concentration is not 13.9% or more (NO), the first control unit 51 proceeds to step S9, and the carbon dioxide concentration is determined based on the detection result of the second sensor 42. Judge whether it is 3% or less. When it is determined that the carbon dioxide concentration is 3% or less (YES), the first control means 51 closes the second control valve 32 and stops the supply of the second gas to the room 2 (step S7). Then, the first control valve 31 is opened to supply the first gas to the room 2 (step S8). Then, it returns to step S2 and repeats the process after step S2.

  On the other hand, when it is determined in step S9 that the carbon dioxide concentration is not 3% or less (NO), the first control unit 51 returns to step S2 and repeats the processing after step S2. As described above, the processes in steps S1 to S9 in FIG. 3 are repeatedly performed, so that the oxygen concentration in the room 2 is maintained within a range of 12 to 13.1% and the carbon dioxide concentration is 3 to 3. Maintained within 5% range.

<Fire extinguishing control>
Next, fire extinguishing control by the second control means 52 will be described with reference to FIG. In the unlikely event that a fire occurs in the room 2, the second control means 52 executes the processes of steps S11 to S17 in FIG. Thereby, notification of fire occurrence and fire extinguishing are performed quickly. The fire extinguishing control described below is executed in preference to the air adjustment control by the first control means 51 described above. In addition, the air conditioner 1 of this embodiment can also perform fire notification and extinguishing by manual operation of an operator.

  When the air conditioner 1 of the present embodiment is activated, the second control unit 52 determines whether a signal is received from the fire detector 71 (step S11). When it is determined that no signal is received from the fire detector 71 (NO), the second control unit 52 repeats the determination in step S11.

  On the other hand, if it is determined in step S11 that a signal has been received from the fire detector 71 (YES), the second control means 52 proceeds to step S12 and notifies the occurrence of fire through the speaker 72. Thereafter, the second control means 52 proceeds to step S13 and determines whether or not the first control valve 31 is open.

  When it is determined in step S13 that the first control valve 31 is open (YES), the second control means 52 proceeds to step S16 and continues until the predetermined time elapses (NO), the first control valve 31. Is kept open. Thus, the first gas is supplied to the room 2 until the predetermined time in step S16 has elapsed.

  On the other hand, if it is determined in step S13 that the first control valve 31 is not open (NO), the second control means 52 closes the second control valve 32 and stops the supply of the second gas to the room 2. (Step S14). Then, the first control valve 31 is opened to supply the first gas into the room 2 (step S15). Thereafter, the second control means 52 proceeds to step S16, and keeps the first control valve 31 open until a predetermined time elapses (NO). Thus, the first gas is supplied to the room 2 until the predetermined time in step S16 has elapsed.

  If it is determined in step S16 that the predetermined time has elapsed (YES), the second control means 52 proceeds to step S17, closes the first control valve 31, and stops the supply of the first gas to the room 2. Thereby, the fire extinguishing control of the 2nd control means 52 is complete | finished.

  By supplying the first gas continuously for a predetermined time in step S16, the oxygen concentration in the room 2 is reduced to 12 to 14%, and the fire generated in the room 2 is quickly extinguished by suffocation. In addition, the supply of the first gas increases the carbon dioxide concentration in the room 2 to 3 to 4%, thereby exerting a breathing promoting effect on the person in the room 2. For example, a time within 60 seconds can be set as the predetermined time in step S16.

<Effect>
In the air conditioning apparatus 1 of the present embodiment shown in FIG. 1, the first control means 51 executes the air conditioning control shown in FIG. According to this air conditioning control, the oxygen concentration in the room 2 that is the protection target section is accurately maintained within a range of 12 to 14%, and the carbon dioxide concentration is accurately maintained within a range of 3 to 4%. . As a result, it is possible to form and maintain an indoor environment in which humans can breathe and cannot burn combustible materials, and it is possible to prevent fires from occurring. In other words, there is absolutely no damage from fire.

  The air conditioner 1 of the present embodiment uses IG-541 in which 52% nitrogen, 40% argon, and 8% carbon dioxide are mixed as the first gas for controlling the oxygen concentration and carbon dioxide concentration in the room 2. It has become the composition. According to this configuration, the commercially available IG-541 is used as it is, and the oxygen concentration in the room 2 is set within a range of 12 to 14%, and at the same time, the carbon dioxide concentration is set within a range of 3 to 4%. Can do. Therefore, when the IG-541 is used, it is relatively easy to form and maintain an indoor environment in which humans can breathe and cannot burn combustibles.

  The air conditioner 1 of this embodiment has a configuration in which air is used as the second gas for adjusting the oxygen concentration and the carbon dioxide concentration in the room 2. According to this configuration, the configuration for supplying the second gas into the room 2 can be extremely simplified, and the safety of the air conditioning device 1 can be greatly improved. As already described, it is conceivable to supply pure oxygen to the room 2 as the second gas, but the pure oxygen is harmful to the human body and may cause a fire or an explosion. For this reason, the structure of an apparatus becomes complicated by the necessity of ensuring safety | security. Therefore, if air containing oxygen is used as the second gas, the safety of the device becomes extremely high and the configuration of the device becomes simple.

  The air conditioner 1 of the present embodiment is configured such that the room 2 is maintained at a positive pressure by supplying the first gas. According to this configuration, outdoor air is less likely to enter the room 2, and accurate control of the oxygen concentration and the carbon dioxide concentration is facilitated.

  The air conditioner 1 of the present embodiment has a configuration in which an air circulator 60 is provided in the room 2. According to this configuration, the air component in the room 2 can be made uniform, and the oxygen concentration and the carbon dioxide concentration can be detected and controlled more accurately.

  The air conditioning apparatus 1 of the present embodiment is configured to be able to execute the fire extinguishing control of FIG. 4 by the second control unit 52 in addition to the air conditioning control of FIG. According to this configuration, the double fire prevention measures are taken, that is, the prevention of the fire occurrence by the first control means 51 and the rapid fire extinguishing after the fire occurrence by the second control means 52. For example, if the control of the oxygen concentration and the carbon dioxide concentration by the first control means 51 is not executed intentionally or due to a failure, even if a fire occurs, the second control means 52 causes the fire to occur. In addition to notifying, the first gas is released to quickly extinguish the fire.

<Other changes>
In addition, the air conditioning apparatus of this invention is not limited to embodiment mentioned above. For example, the 1st and 2nd control valves 31 and 32 shown in FIG. 1 may be the structure directly provided in the gas cylinder instead of the pipe line 20. The first and second control valves 31 and 32 may be a single control valve (for example, a three-way valve) that switches between the first gas and the second gas. That is, the first and second control valves in the present invention are not limited to two control valves, and may be a single control valve.

  The means for supplying the first and second gases is not limited to the configuration of the first and second gas units 11 and 12 shown in FIG. For example, a gas separation device may be used instead of the gas cylinder. When the second gas is air, any means (for example, a blower or a suction fan) that can supply air to the room 2 can be applied. For example, a blower for supplying air is connected to the room 2 via a dedicated pipe line 20. A damper is provided in the opening on the discharge side of the one pipe line 20. The damper is in hermetic contact with the inner peripheral surface of the opening on the discharge side of one pipe line 20. This prevents gas leakage from the positive pressure chamber 2 to the outside through the one pipe line 20. According to such a configuration, it is possible to simplify the equipment for supplying the second gas into the room, and the air conditioner of the present invention can be implemented at low cost.

  The first control means 51 and the second control means 52 may be realized by a single arithmetic processing device. However, the second control means 52, the fire detector 71, and the speaker 72 constitute a gas fire extinguishing equipment in the Japanese Fire Service Law, and therefore must be configured to comply with laws and regulations related to the gas fire extinguishing equipment. . The air conditioner of the present invention requires a configuration for maintaining the indoor oxygen concentration and the oxygen dioxide concentration within a predetermined numerical range, and the configuration as the above-described gas fire extinguishing equipment may be omitted or changed. Good. For example, although the air conditioner 1 of the present embodiment includes a gas fire extinguishing facility using IG-541, it may be changed to another gas fire extinguishing facility or a fire extinguishing facility other than the gas system.

1 Air conditioner 2 Protected area (indoor)
DESCRIPTION OF SYMBOLS 11 1st gas unit 12 2nd gas unit 20 Pipe line 21 Injection head 31 1st control valve 32 2nd control valve 41 1st sensor 42 2nd sensor 51 1st control means 52 2nd control means 60 Air circulator 71 Fire detection 72 Speaker (notification means)
73 Pressure relief port

Claims (8)

An air conditioner that adjusts air components in and out of a room,
A first gas containing at least carbon dioxide and an inert gas;
A second gas containing at least oxygen;
A conduit for supplying the first and second gases into the room;
At least one control valve for controlling the flow of the first and second gases;
A first sensor for detecting the oxygen concentration in the room;
A second sensor for detecting the carbon dioxide concentration in the room;
By controlling the control valve based on the detection results of the first and second sensors, the oxygen concentration in the room is maintained within a range of 12 to 14%, and the carbon dioxide concentration in the room is 3 to 3. Control means for maintaining within a range of 4%,
An air conditioner characterized by that. The control means includes
After controlling the control valve and starting the supply of the first gas into the room, at least,
a) Based on the detection result of the first sensor, it is determined whether or not the oxygen concentration is 12% or less. If it is determined that the oxygen concentration is 12% or less, the control valve is controlled to Stopping the supply of the first gas to the chamber and supplying the second gas into the chamber;
b) Based on the detection result of the second sensor, it is determined whether or not the carbon dioxide concentration is not less than a value within the range of 3.5 to 3.9%, and the carbon dioxide concentration is 3.5 to 3.9%. If it is determined that the value is equal to or greater than a value within the range, the control valve is controlled to stop the supply of the first gas into the room and supply the second gas into the room.
c) Based on the detection result of the first sensor, it is determined whether or not the oxygen concentration is not less than a value within the range of 13.1 to 13.9%, and the oxygen concentration is within the range of 13.1 to 13.9%. If it is determined that the value is equal to or greater than the value, the control valve is controlled to stop the supply of the second gas into the room and supply the first gas into the room.
d) Based on the detection result of the second sensor, it is determined whether or not the carbon dioxide concentration is 3% or less. When it is determined that the carbon dioxide concentration is 3% or less, the control valve is controlled, Stopping the supply of the second gas into the room and supplying the first gas into the room;
The air conditioning apparatus according to claim 1, wherein control including:   The air conditioning apparatus according to claim 1 or 2, wherein the first gas is an Inagen (registered trademark) gas in which 52% nitrogen, 40% argon, and 8% carbon dioxide are mixed.   The air conditioning apparatus according to any one of claims 1 to 3, wherein the second gas is air.   The air conditioner according to any one of claims 1 to 4, wherein the interior of the chamber is maintained at a positive pressure by the supply of the first gas.   The air conditioning apparatus according to any one of claims 1 to 5, wherein an air circulator is provided in the room. An air conditioner that adjusts air components in and out of a room,
A conduit for supplying a first gas containing at least carbon dioxide and an inert gas into the chamber;
At least one control valve for controlling the flow of the first gas;
A first sensor for detecting the oxygen concentration in the room;
A second sensor for detecting the carbon dioxide concentration in the room;
A third sensor for detecting a pressure difference between the room and the outside;
By controlling the control valve based on the detection results of the first and second sensors, the oxygen concentration in the room is maintained within a range of 12 to 14%, and the carbon dioxide concentration in the room is 3 to 3. And a control means for maintaining the atmospheric pressure in the room at a positive pressure that is the same as or higher than the atmospheric pressure outside the room based on the detection result of the third sensor, while maintaining within a range of 4%.
An air conditioner characterized by that. A fire detector installed in the room;
Fire alarm means;
A second control means different from the control means,
The second control means, when receiving a signal from the fire detector, notifies the occurrence of a fire by the notification means and opens the first control valve in preference to the control of the control means, The air conditioner according to any one of claims 1 to 7, wherein the first gas is continuously released into the room for a period of time.