JP2008081371A - Gas generator and fire extinguishing system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promptly raise the pressure in the piping of fire extinguishing equipment side up to a prescribed pressure by utilizing an air compressor annexed to a nitrogen generator. <P>SOLUTION: A bypass pipe line 67 for flowing pressurized air into a buffer tank 63 from an air tank 24 is provided between the air tank 24 of a compressor 22 side and the buffer tank 63 so as to bypass an adsorption unit 28. A check valve 68 and a pressure reducing valve 69 are provided on the way of the bypass pipe line 67. When a gas generator 21 or the like, for example, is again operated from such a state that the operation of the gas generator 21 is once stopped due to periodic inspection, the shortage amount of nitrogen gas to be supplied to a piping line 8 (air supply pipe 10) is covered by pressurized air from the bypass line 67. Thereby, for example, the pressure in secondary side piping 15, 17 in a building 1 is rapidly raised to a prescribed pressure and it becomes possible to promptly respond in the case of emergency such as fire occurrence. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas generator suitably used for taking a fire prevention measure for a building such as a commercial building or a hotel, and a fire extinguishing system using the device.

  Generally, buildings such as hotels and buildings are provided with fire extinguishing equipment called so-called sprinklers as fire protection equipment. A pre-acting sprinkler device and a dry sprinkler device configured to fill the inside of the piping with pressurized air in order to suppress malfunction of the sprinkler, piping freezing, and the like are known (see, for example, Patent Document 1). .

JP-A-6-105927

  In this type of pre-acting sprinkler device according to the prior art, a so-called secondary pipe is provided on the ceiling side of a building, and a sprinkler head is attached to each room in the middle of the secondary pipe. The spout head of each sprinkler head is provided with a plug or the like of a soluble material that normally closes the discharge port and melts by heat to open the discharge port in the event of a fire.

  The secondary side pipe to which the sprinkler head is attached is, for example, a three-way valve with respect to the primary side pipe composed of a fire-extinguishing water supply pipe for supplying fire-extinguishing water and a gas supply pipe for supplying pressurized air. Connected via an alarm valve. The gas supply pipe is connected to a pressurized air supply source, and the fire-extinguishing water supply pipe is connected to a fire-extinguishing water supply pump.

  In this case, the alarm valve is closed at a normal time when air of a predetermined pressure is supplied into the secondary side piping, and the air pressure in the secondary side piping is reduced to a specified pressure or lower due to gas leakage or the like. Then, when the alarm valve is opened, pressurized air is supplied (supplemented) from the gas supply pipe into the secondary side pipe, and the pressure in the secondary side pipe is maintained at a predetermined pressure.

  When a fire occurs in the building room, a fire detection water supply pump is activated by outputting a detection signal from a fire detection sensor or the like. At this time, the secondary pipe has an alarm valve. The fire-extinguishing water supply pipe is connected to the water and fire-extinguishing water is introduced into the secondary pipe. And in the room where the fire broke out, the soluble substance (plug body) of the sprinkler head is melted by heating, so the sprinkler head discharge port opens and the fire extinguishing water in the secondary side pipe is directed into the room. To be released.

  In this way, the pre-actuated sprinkler device is filled with pressurized air in the secondary pipe at normal times until a fire breaks out. There is an advantage that it is possible to prevent problems such as water discharge.

  On the other hand, as a nitrogen gas generator according to the prior art, a nitrogen gas generator using a PSA type (Pressure Swing Absorption) gas separator equipped with an air compressor, a dryer, a separation means and the like is known (for example, Patent Document 2). In this case, the separation means of the gas separation device separates pressurized air into nitrogen gas and oxygen gas using an adsorbent made of molecular sieve carbon or zeolite.

JP 2003-117330 A

  By the way, in the fire extinguishing equipment for buildings according to the above-described prior art, the configuration is such that the inside of the secondary side pipe is filled with pressurized air at a normal time until a fire occurs. However, for example, if pressurized air is supplied into the secondary pipe while moisture remains after a water flow test or the like into the pipe, the secondary pipe is filled with moist air. become.

  And if such a state continues for a long period of time, rust is likely to occur in the secondary side piping due to moisture etc., and depending on the case, the water discharge performance and fire extinguishing performance in the event of a fire may be caused by the rust generation part There is a problem that it falls.

  In order to solve such a problem, it has been proposed to supply nitrogen gas into a pipe that suppresses generation of rust (oxide) by using a nitrogen gas generator. However, if the secondary side piping is filled with nitrogen gas, the generation of rust can be suppressed, but the following unsolved problems arise.

  In other words, the nitrogen gas generation apparatus according to the prior art has, as its inherent characteristics, the pressure in the apparatus must be high to some extent, and the supplied air needs to be dry. Since the concentration of the gas is low and the nitrogen gas is not supplied until the concentration reaches a specified concentration, it takes time from the start of operation until the nitrogen gas is discharged and supplied.

  On the other hand, according to laws such as the Fire Services Act, for example, when fire extinguishing equipment is started again from a state where it has been temporarily stopped during periodic inspections, etc. Is required to be increased to a specified pressure within a predetermined time (for example, about 30 minutes). However, in the conventional nitrogen gas generator, since it takes time from the start of operation until the nitrogen gas is discharged and supplied as described above, the nitrogen gas is brought to the specified pressure within a predetermined time after the start of operation. There is a problem that it is difficult to boost the voltage.

  For this reason, an air compressor is additionally provided separately from the nitrogen gas generator, and in the initial stage after the start of operation, pressurized air from the air compressor is supplied into the secondary side pipe, and the pressure in the pipe is reduced. Measures such as gradually replacing the air in the secondary pipe with nitrogen gas after increasing the pressure to the specified pressure with pressurized air are being studied.

  However, in this case, since the air compressor is installed separately from the nitrogen gas generator, for example, installation space for two devices is required, and not only the requirements for miniaturization and weight reduction cannot be satisfied, but also the total number of parts is reduced. This increases the amount of labor and time spent during assembly and maintenance, and increases costs.

  In this case, even if the nitrogen gas generator is continuously operated throughout the year, the separately added air compressor is operated only once or twice a year, for example. For this reason, there is a possibility that problems such as rust occur inside the air compressor while the operation is suspended.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to make effective use of an air compressor attached to a nitrogen gas generator, for example, to quickly reduce the pressure in the pipe on the fire extinguishing equipment side. A gas generator and a device capable of boosting the pressure to a specified pressure, eliminating the need for an additional air compressor, and improving safety, reliability, etc. in the event of a fire It is to provide a fire extinguishing system used.

  Another object of the present invention is to reduce the installation space of the entire apparatus by reducing the need for an additional air compressor or the like, thereby reducing the size and weight, and reducing the number of parts. It is an object of the present invention to provide a gas generator and a fire extinguishing system using the device, which can suppress the increase in the amount of gas and improve the workability during assembly and maintenance.

  In order to solve the above-described problems, the configuration adopted by the invention of claim 1 is an air compressor that compresses air, and nitrogen that generates nitrogen gas by separating oxygen from the compressed air generated by the air compressor. In the gas generator comprising the gas generator, the nitrogen gas generator is connected to a tank for temporarily storing the nitrogen gas generated by the nitrogen gas generator before being supplied to the supply object. A bypass pipe is provided between the air compressor and the tank to bypass the nitrogen gas generator and circulate the compressed air in the tank; the air compressor and the tank including the bypass pipe; It is characterized by having a configuration in which a valve means for communicating and blocking the bypass pipe line with respect to the tank is provided in the channel between the two.

  According to a second aspect of the present invention, the valve means includes a check valve that allows compressed air to flow from the air compressor toward the tank and prevents reverse flow, the check valve, and the check valve The pressure reducing valve is provided between the air compressor and suppresses the pressure in the bypass pipe to a predetermined set pressure or less.

  According to a third aspect of the present invention, the supply object is configured by a piping line of a fire extinguishing facility that is disposed in a building and releases a fire extinguishing substance from a discharge port when a fire occurs.

  On the other hand, the fire extinguishing system using the gas generator according to the invention of claim 4 is provided with a piping line having a discharge port arranged in a building, and in the event of a fire, the fire extinguishing material releases a fire extinguishing substance from the discharge port of the piping line Equipment, an air compressor that compresses air, a nitrogen gas generator that generates nitrogen gas by separating oxygen from the compressed air generated by the air compressor, and a nitrogen gas generated by the nitrogen gas generator A gas generating device comprising a tank for storing the gas, and a tank of the gas generating device for selectively introducing nitrogen gas and pressurized air in addition to the fire extinguishing substance on the inflow side of the piping line A bypass line for bypassing the nitrogen gas generator and allowing the compressed air to flow through the tank is provided between the air compressor and the tank. Before including The flow path between the air compressor and the tank has a configuration of providing the communicating bypass line with respect to the tank, valve means for blocking.

  As described above, according to the first aspect of the present invention, between the air compressor and the tank, the bypass pipe that bypasses the nitrogen gas generator and flows the compressed air into the tank, and the bypass pipe For example, when the bypass pipe is shut off by the valve means, the nitrogen gas generated by the nitrogen gas generator is sequentially introduced into the tank. While storing, the nitrogen gas in the tank can be supplied toward the supply object.

  When the amount (or pressure) of nitrogen gas to be supplied to the supply object is insufficient, the valve means communicates with the tank to bypass the nitrogen gas generator and compress the air. Compressed air can be discharged into the tank from the machine, and the compressed air at this time can be sequentially stored in the tank and the pressurized air (compressed air) in the tank can be supplied toward the supply object. it can. As a result, the shortage of nitrogen gas can be covered by pressurized air, and the pressure on the supply object side can be increased quickly by pressurized air.

  Therefore, without using an additional air compressor separately from the gas generator, the air compressor attached to the gas generator can be effectively used to provide a supply object (for example, a pipe on the fire extinguishing equipment side). The pressure can be increased to the specified pressure at an early stage, and safety, reliability, etc. in the event of a fire can be improved. In addition, the installation space of the entire gas generator can be reduced, the device can be reduced in size and weight, the increase in the number of parts can be suppressed, and workability during assembly and maintenance can be improved. be able to.

  In the invention according to claim 2, the valve means is constituted by a check valve and a pressure reducing valve. In this case, the check valve bypasses the compressed air from the air compressor toward the tank. The gas in the tank (nitrogen gas or compressed air) can be prevented from flowing backward in the bypass line. And, the pressure reducing valve provided between the check valve and the air compressor suppresses the pressure in the bypass pipe to a predetermined set pressure or less, so when the pressure in the tank becomes the set pressure or less, The pressure reducing valve opens to allow the compressed air from the air compressor to flow toward the tank. When the set pressure is exceeded, the pressure reducing valve closes to block the compressed air from flowing toward the tank. be able to.

  In the invention according to claim 3, since the supply object for supplying nitrogen gas is constituted by a piping line of a fire extinguishing facility provided in the building, when the bypass pipe is shut off by the valve means, While sequentially storing nitrogen gas generated by the gas generator in the tank, the nitrogen gas in the tank can be supplied toward the piping line of the fire extinguishing equipment. When the amount (or pressure) of nitrogen gas to be supplied into the piping line is insufficient, the bypass means is communicated with the tank by the valve means so that the nitrogen gas generator is bypassed and added to the tank. The compressed air can be discharged, and the pressurized air at this time can be supplied toward the piping line of the fire extinguishing equipment through the tank.

  Further, in the invention according to claim 4, by applying the gas generator as described above to the fire extinguishing equipment, when the bypass pipe is shut off by the valve means, the nitrogen gas generated by the nitrogen gas generator is stored in the tank. The nitrogen gas in the tank can be supplied toward the piping line of the fire extinguishing equipment while being sequentially stored therein. When the amount of nitrogen gas to be supplied into the piping line is insufficient, the valve means communicates the bypass line with the tank, thereby bypassing the nitrogen gas generator and discharging pressurized air into the tank. It is possible to supply the pressurized air in the tank toward the piping line of the fire extinguishing equipment while sequentially storing the pressurized air at this time in the tank.

  As a result, the shortage of nitrogen gas can be covered by the pressurized air, and the pressure in the piping line can be increased to the specified pressure early by the pressurized air. This makes it possible to quickly increase the pressure in the piping on the fire extinguishing equipment side to the specified pressure, for example in the event of an emergency such as a fire. Can be dealt with early.

  Hereinafter, a gas generator according to an embodiment of the present invention and a fire extinguishing system using the device will be described in detail with reference to the accompanying drawings, taking as an example a case where it is applied to a building such as a commercial building.

  Here, FIG. 1 to FIG. 3 show a first embodiment of the present invention. In the figure, 1 is a building as a building, and this building 1 constitutes a multi-story building consisting of, for example, the (n-1) th floor, the (n) th floor, and the (n + 1) th floor. For example, an internal space 2 including one or a plurality of rooms is formed on the (n) floor of the building 1, and a similar internal space 3 is formed on the (n + 1) floor.

  On the other hand, the (n-1) floor of the building 1 has an internal space 4 serving as a basement, for example, and the lower surface thereof is a floor surface 4A. A gas generator 21 and the like which will be described later are installed on the upper side of the floor surface 4A, and a fire extinguishing water tank 5 and the like in which water for extinguishing that becomes a fire extinguishing substance at the time of fire, for example, is stored below the floor surface 4A. Is provided.

  Reference numeral 6 denotes a water supply pump as a sprinkler pump. The water supply pump 6 constitutes a supply pump that supplies fire-extinguishing water (extinguishing material) to a primary side pipe 9 and secondary side pipes 15 and 17 described later. . And the water supply pump 6 comprises the fire-extinguishing equipment of the building 1 with the fire-extinguishing water tank 5, the piping line 8 mentioned later, etc.

  Here, as shown in FIG. 1, the water supply pump 6 pumps fire-extinguishing water from the water absorption filter 6 </ b> A in the fire-extinguishing water tank 5 and discharges it into a water supply pipe 7 serving as a fire-extinguishing substance supply pipe. The water supply pipe 7 extends upward in the internal space 4 of the (n-1) floor, and its upper end (tip) side is connected to an inflow side of a primary side pipe 9 described later via a switching valve 11. .

  8 is a piping line that is arranged so as to extend almost entirely from the (n-1) floor to the (n + 1) floor of the building 1, and this piping line 8 includes a water supply pipe 7 as a fire extinguishing substance supply pipe, A primary side pipe 9, an air supply pipe 10, switching valves 11 and 12, alarm valves 13 and 14, and secondary side pipes 15 and 17 for each floor, which will be described later, are configured.

  Reference numeral 9 denotes a primary side pipe as a supply pipe provided in the building 1. The primary side pipe 9 is connected to a water supply pipe 7 and an air supply pipe 10 to be described later at the inflow side of the primary side pipe 9. The side is connected to alarm valves 13 and 14 described later. The primary side pipe 9 constitutes a supply pipe that selectively supplies air and water to the alarm valves 13 and 14 in accordance with opening and closing operations of switching valves 11 and 12 to be described later. The pipe is used as a fire extinguishing substance supply pipe.

  10 is an air supply pipe constituting a gas supply pipe. This air supply pipe 10 is connected to a gas generator 21 (described later), one side of which is a gas supply source, and the other side is connected through a switching valve 12 at a connection point 9A. It is connected to the inflow side of the secondary pipe 9. The air supply pipe 10 supplies gas (nitrogen gas or pressurized air) generated by the gas generator 21 when the switching valve 12 described later is opened toward the primary pipe 9.

  Reference numeral 11 denotes a switching valve that connects and disconnects the water supply pipe 7 to and from the primary side pipe 9, and 12 denotes a switching valve that connects and disconnects the air supply pipe 10 to and from the primary side pipe 9. Here, the switching valves 11 and 12 are selectively opened and closed by a switching signal from a control device (not shown).

  That is, at the normal time before the occurrence of a fire, the switching valve 11 is closed and the switching valve 12 is opened. As a result, the primary side pipe 9 communicates with the air supply pipe 10, and gas (nitrogen gas or pressurized air) generated by a gas generator 21 described later is introduced into the primary side pipe 9. On the other hand, when a fire occurs, the switching valve 11 is immediately opened and the switching valve 12 is closed. Thereby, the primary side pipe 9 communicates with the water supply pipe 7, and the water for fire extinguishing discharged from the water supply pump 6 is introduced into the primary side pipe 9.

  13 is an alarm valve as a valve device provided on the (n) floor of the building 1. The alarm valve 13 has an inflow side connected to a primary side pipe 9, and an outflow side connected to a secondary side pipe 15 described later. It is connected. The alarm valve 13 has a function as a valve device for communicating and blocking between the primary side pipe 9 and the secondary side pipe 15 according to the pressure in the secondary side pipe 15.

  That is, the alarm valve 13 connects the primary side pipe 9 to the secondary side described later when the pressure in the secondary side pipe 15 is lower than a predetermined pressure (for example, 0.1 MPa) as a predetermined specified pressure. For example, pressurized air or nitrogen gas, which will be described later, is allowed to flow from the air supply pipe 10 to the secondary side pipe 15 via the switching valve 12 and the primary side pipe 9. When the pressure in the secondary side pipe 15 reaches the specified pressure, the alarm valve 13 closes to shut off the primary side pipe 9 and the secondary side pipe 15, and the secondary side pipe 15. This prevents the internal pressure from becoming excessively higher than the specified pressure.

  Further, the alarm valve 13 is opened as the pressure in the water supply pipe 7 increases due to the driving of the water supply pump 6 and the pressure in the secondary side pipe 15 decreases, for example, when a fire occurs as described later. Sometimes, the water for fire extinguishing is allowed to flow vigorously from the water supply pipe 7 to the secondary side pipe 15 through the switching valve 11 and the primary side pipe 9.

  Reference numeral 14 denotes an alarm valve as a valve device provided on the (n + 1) floor of the building 1, and the alarm valve 14 is configured in the same manner as the alarm valve 13 on the (n) floor described above, and a secondary side pipe 17 to be described later. The primary side pipe 9 and the secondary side pipe 17 are communicated and blocked according to the internal pressure.

  Reference numeral 15 denotes a secondary side pipe as an outflow side pipe arranged along the ceiling side of the (n) floor. The secondary side pipe 15 is connected to the primary side pipe 9 via the alarm valve 13 on one side. The other side extends to a position of an end valve 19 described later. A plurality of sprinkler heads 16, 16,... Are provided in the middle of the secondary pipe 15 so as to be located in the inner space 2, and these sprinkler heads 16 are spaced from each other on the ceiling side of the inner space 2, for example. It is arranged with.

  Here, each sprinkler head 16 constitutes a discharge port of the secondary side pipe 15 (pipe line 8), and its opening is closed by a plug body 16A made of a soluble material as an opening means. Each sprinkler head 16 melts the plug body 16A on the side of at least one sprinkler head 16 when a high heat is generated in the event of a fire, thereby opening the corresponding sprinkler head 16 and discharging water as described later. Is.

  Reference numeral 17 denotes a secondary side pipe as an outflow side pipe arranged along the ceiling side of the (n + 1) floor. The secondary side pipe 17 is connected to the primary side pipe 9 via the alarm valve 14 on one side. The other side extends to a position of a terminal valve 20 described later. A plurality of sprinkler heads 18, 18,... Are provided in the middle of the secondary pipe 17 in the internal space 3, and these sprinkler heads 18 are also configured in the same manner as the sprinkler head 16 described above. ing.

  That is, each sprinkler head 18 constitutes a discharge port of the secondary side pipe 17 (pipe line 8), and the opening is closed by a soluble plug 18A as an opening means. And each sprinkler head 18 opens one of the corresponding sprinkler heads 18 and discharges water when the plug 18A is melted by high heat or the like at the time of the occurrence of a fire.

  Reference numeral 19 denotes a terminal valve provided on the front end side (the other side) of the secondary pipe 15 on the (n) floor of the building 1. The terminal valve 19 is connected to the control device via an actuator (none of which is shown). Open and closed. When the end valve 19 is opened, the inside of the secondary side pipe 15 communicates with the atmosphere and becomes an atmospheric pressure (0.0 MPa) state.

  Further, when the pressure in the secondary side pipe 15 is increased to a specified pressure (for example, 0.1 MPa), the end valve 19 is held in a closed state. On the other hand, on the (n + 1) floor of the building 1, a similar end valve 20 is provided on the front end side (other side) of the secondary side pipe 17.

  Reference numeral 21 denotes a gas generator that constitutes a gas supply source. This gas generator 21 is configured using a so-called PSA type gas separator, and as shown in FIG. The unit 28 is configured.

  Reference numeral 22 denotes an air compressor (hereinafter referred to as a compressor 22) which is a supply source of compressed air. The compressor 22 is driven by, for example, an electric motor 23 and compresses the air sucked from the suction port to generate compressed air. It is what happens. An air tank 24 as an air tank is connected to the discharge side of the compressor 22 via an air conduit or the like.

  Reference numeral 25 denotes a dryer as a dehumidifying means provided on the discharge side of the air tank 24. The dryer 25 is constituted by, for example, a refrigeration dryer (dryer) that performs a dehumidifying operation by external power feeding. And the dryer 25 removes the water | moisture content in the compressed air discharged from the compressor 22 at the time of the electric power feeding from the outside, and supplies the dried compressed air to the below-mentioned dry piping 26 side. Further, a drain discharge valve 25A is attached to the lower side of the dryer 25, and the drain discharge valve 25A is opened and closed in order to discharge moisture accumulated in the dryer 25 to the outside.

  26 is a dry pipe connected to the outflow side of the dryer 25. As shown in FIG. 2, the dry pipe 26 is provided with an air filter 27 or the like at a midway position, and the downstream side is an adsorption unit described later. 28 is connected to introduction pipes 29 and 30.

  Reference numeral 28 denotes an adsorption unit as a nitrogen gas generator that adsorbs oxygen in the compressed air and separates nitrogen gas, and the adsorption unit 28 includes adsorption tanks 31 and 32 described later. And the adsorption | suction unit 28 produces | generates nitrogen gas by the side of the nitrogen tank 45, isolate | separating oxygen from the compressed air introduce | transduced from the dry piping 26 side by the adsorption tanks 31 and 32 etc. which are mentioned later.

  Reference numerals 29 and 30 denote introduction pipes for introducing compressed air into the adsorption unit 28. The introduction pipes 29 and 30 are connected to the downstream side of the dry pipe 26, and are connected to the inside of the adsorption unit 28 from the dryer 25 side via the dry pipe 26. Compressed air (pressurized air) led to is circulated toward the adsorption tanks 31 and 32 described later.

  31 and 32 are first and second adsorption tanks constituting a part of the adsorption unit 28. The first and second adsorption tanks 31 and 32 are filled with an adsorbent made of, for example, molecular sieve carbon. Has been. And the adsorption tanks 31 and 32 are connected to the air tank 24 via the introduction pipes 29 and 30 etc., and produce | generate nitrogen gas, isolate | separating oxygen from the said compressed air.

  Here, air supply valves 33 and 34 as shut-off means including electromagnetic valves are provided in the middle of the introduction pipes 29 and 30. The air supply valves 33 and 34 alternately open and close the valve to supply the compressed air in the air tank 24 to the adsorption tanks 31 and 32 alternately.

  Reference numerals 35 and 36 denote exhaust pipes. The exhaust pipes 35 and 36 discharge desorption exhaust gas (gas) from the adsorption tanks 31 and 32 when desorbing oxygen molecules from the adsorbent in the adsorption tanks 31 and 32. Silencers 37 and 37 for reducing exhaust noise are provided on the discharge end side of the piping.

  Further, exhaust valves 38 and 39 made of electromagnetic valves are provided in the middle of the exhaust pipes 35 and 36, and the exhaust valves 38 and 39 remove the desorbed exhaust gas in the adsorption tanks 31 and 32 in each half cycle (one side). In order to discharge alternately every half cycle from the adsorption step to the pressure equalization step).

  Reference numerals 40 and 41 denote extraction pipes for taking out nitrogen gas as product gas from the adsorption tanks 31 and 32. The extraction pipes 40 and 41 are connected to the adsorption tanks 31 and 32 on one side and connected to the lead-out pipe 42 on the other side. Has been. Further, in the middle of the extraction pipes 40 and 41, extraction valves 43 and 44 each consisting of an electromagnetic valve are provided, respectively, and the extraction valves 43 and 44 are alternated only for a half cycle by a control signal from a control circuit 62 described later. Are opened and closed. The outlet pipe 42 connects the downstream side of the extraction pipes 40 and 41 to a nitrogen tank 45 described later.

  Reference numeral 45 denotes a nitrogen tank as a storage tank connected to the outlet pipe 42. The nitrogen tank 45 stores therein nitrogen gas as product gas generated by the adsorption tanks 31 and 32, and a nitrogen extraction pipe 51 described later. The nitrogen gas is supplied to a buffer tank 63 described later via

  Reference numerals 46 and 47 denote pressure equalizing pipes that communicate between the adsorption tanks 31 and 32. One of the pressure equalizing pipes 46 and 47 is provided on the upstream side of the adsorption tanks 31 and 32. , 30. The other pressure equalizing pipe 47 is disposed between the extraction pipes 40 and 41 on the downstream side of the adsorption tanks 31 and 32.

  Here, a pressure equalizing pipe 46 connecting the introduction pipes 29 and 30 is provided with a lower pressure equalizing valve 48 made of an electromagnetic valve in the middle thereof. On the other hand, the pressure equalizing pipe 47 connecting the extraction pipes 40 and 41 is provided with an upper pressure equalizing valve 49 including another electromagnetic valve in the middle thereof. The upper and lower pressure equalizing valves 48 and 49 are opened for a predetermined number of seconds just before the end of each half cycle by the adsorption tanks 31 and 32, and a pressure equalizing process described later is executed. The pressure is equalized. A throttle 50 is connected in parallel to the pressure equalizing pipe 47.

  Reference numeral 51 denotes a nitrogen extraction pipe connected to the outflow side of the nitrogen tank 45, and the nitrogen extraction pipe 51 extracts nitrogen gas generated on the nitrogen tank 45 side toward a buffer tank 63 described later, so that the tip (downstream) ) Side is connected to the buffer tank 63. Further, a filter regulator 52, a nitrogen extraction valve 57, which will be described later, a flow rate adjustment valve 58, and the like are provided in the middle of the nitrogen extraction pipe 51.

  Reference numeral 53 denotes a concentration sensor for detecting the concentration of nitrogen gas stored in the nitrogen tank 45. The concentration sensor 53 is configured by using, for example, an oxygen sensor and the like, and a branch pipe 54 branched from an intermediate position of the nitrogen extraction pipe 51. It is connected to the tip side. Further, a concentration detection valve 55 and a flow rate adjustment valve 56 made up of electromagnetic valves are provided in the middle of the branch pipe 54. The concentration detection valve 55 is always kept open during operation of the gas generator 21 so that the concentration sensor 53 can detect the nitrogen gas concentration (oxygen concentration) in the nitrogen tank 45. .

  Reference numeral 57 denotes a nitrogen extraction valve made up of an electromagnetic valve. The nitrogen extraction valve 57 is located on the downstream side of the branch pipe 54 and is provided in the middle of the nitrogen extraction pipe 51. In addition, the outflow side of the nitrogen extraction valve 57 is connected to a buffer tank 63 described later via a flow rate adjustment valve 58. The nitrogen extraction valve 57 is controlled to be opened and closed by a control signal from a control circuit 62 described later.

  That is, the nitrogen extraction valve 57 is kept closed until the detected concentration (nitrogen gas concentration) detected on the concentration sensor 53 side reaches a specified concentration of, for example, about 99.9%. When the detected concentration exceeds the specified concentration, the nitrogen extraction valve 57 is opened, and the nitrogen gas in the nitrogen tank 45 is circulated (supplied) toward the buffer tank 63 side.

  Reference numeral 59 denotes an exhaust pipe that is branched from the nitrogen extraction pipe 51 between the filter regulator 52 and the nitrogen extraction valve 57. In the middle of the exhaust pipe 59, there is an exhaust valve 60 comprising an electromagnetic valve and exhaust of nitrogen gas. A variable flow rate adjusting valve 61 that keeps the amount constant is provided. The discharge valve 60 is opened and closed by a control signal from a control circuit 62 described later.

  In this case, the discharge valve 60 is kept open until the concentration detected by the concentration sensor 53 reaches the specified concentration, and the nitrogen gas in the nitrogen tank 45 is discharged from the exhaust pipe 59 to the outside through the flow rate adjustment valve 61. Allow to be done. However, when the detected concentration reaches a specified concentration, the discharge valve 60 is closed and the discharge of nitrogen gas through the exhaust pipe 59 is prohibited.

  62 is a control circuit of the gas generator 21, and the control circuit 62 controls the opening and closing of the air supply valves 33 and 34, the exhaust valves 38 and 39, the take-out valves 43 and 44, and the pressure equalizing valves 48 and 49 to generate nitrogen gas. The processing is performed. Further, the control circuit 62 detects the nitrogen gas concentration in the nitrogen tank 45 based on the concentration signal output from the concentration sensor 53, and controls the opening and closing of the nitrogen take-off valve 57 and the discharge valve 60 based on the detected value, thereby the nitrogen gas. Supply and discharge control.

  That is, the control circuit 62 alternately performs the adsorption process, the extraction process, the pressure equalization process, and the regeneration process in the first and second adsorption tanks 31 and 32, as described later, and generates nitrogen gas and oxygen gas from the compressed air. Control to take out nitrogen gas while separating. The control circuit 62 closes the discharge valve 60 and opens the nitrogen take-off valve 57 when the nitrogen concentration in the nitrogen tank 45 exceeds a specified concentration (for example, 99.9%), and opens the buffer tank. Control to supply nitrogen gas to 63 is performed.

  Reference numeral 63 denotes a tank for temporarily storing nitrogen gas (hereinafter referred to as buffer tank 63). The buffer tank 63 is provided with, for example, two inlets 63A and 63B and one outlet 63C, and two inlets 63A. 63B, the nitrogen tank 45 of the adsorption unit 28 (nitrogen gas generator) is connected to one inflow port 63A via a nitrogen extraction pipe 51 or the like.

  The other inlet 63B is connected to a bypass pipe 67 described later, and the outlet 63C is connected to the supply pipe 10 of the fire extinguishing equipment that is the supply target. The buffer tank 63 supplies nitrogen gas (or pressurized air) stored therein to the secondary pipes 15 and 17 side of the building 1 shown in FIG. 1 through the air supply pipe 10 and the switching valve 12. It is.

  Reference numeral 64 is a check valve provided between the flow rate adjusting valve 58 and the buffer tank 63 and provided in the middle of the nitrogen extraction pipe 51. The check valve 64 is nitrogen gas from the nitrogen tank 45 toward the buffer tank 63. The nitrogen gas is allowed to flow through the take-out pipe 51, and the nitrogen gas is prevented from flowing in the reverse direction.

  A pressure sensor 65 detects the pressure in the buffer tank 63 as a differential pressure from the atmospheric pressure. The pressure sensor 65 outputs a detection signal to the control device, so that the pressure in the buffer tank 63 is determined in advance. It is determined whether or not the set upper limit pressure (for example, 0.55 MPa) has been reached. When the pressure detected by the pressure sensor 65 increases to the upper limit set pressure, the operation of the compressor 22 and the like by the electric motor 23 is stopped.

  Reference numeral 66 denotes a discharge valve attached to the buffer tank 63. The discharge valve 66 is opened when the gas in the buffer tank 63 is discharged to the outside, and is kept closed at other times. .

  Reference numeral 67 denotes a bypass line connected to the inlet 63B of the buffer tank 63. The bypass line 67 is disposed between the discharge side (dryer 25) of the compressor 22 and the buffer tank 63 and the adsorption unit 28 (nitrogen gas generation). Machine). That is, one side of the bypass pipe 67 is connected to the midway position of the dry pipe 26 between the dryer 25 and the air filter 27, and the other side is connected to the inlet 63 </ b> B of the buffer tank 63.

  The bypass pipe 67 allows a part of compressed air (pressurized air) discharged from the compressor 22 as described later to flow into the inlet 63B of the buffer tank 63 via a pressure reducing valve 69, a check valve 68 and the like described later. The pressurized air at this time is supplied into the buffer tank 63 by bypassing the adsorption unit 28.

  68 is a check valve provided in the middle of the bypass pipe 67, and the check valve 68 allows pressurized air to flow through the bypass pipe 67 from the discharge side of the compressor 22 toward the buffer tank 63. To prevent the reverse flow. The check valve 68 constitutes valve means for communicating and blocking the bypass pipe 67 with respect to the buffer tank 63 together with a pressure reducing valve 69 described later.

  Reference numeral 69 denotes a pressure reducing valve provided in the middle of the bypass pipe 67. The pressure reducing valve 69 is disposed between a stop valve 70 and a check valve 68, which will be described later, on the downstream side (the check valve and the check valve 69). The pressure between the valve 68 and the valve 68 is suppressed to a predetermined pressure (for example, about 0.3 MPa) or less.

  That is, when pressurized air is supplied from the discharge side (dryer 25) of the compressor 22 into the buffer tank 63 via the bypass pipe 67 with the stop valve 70, which will be described later, opened, the upstream of the pressure reducing valve 69. Until the pressure on the side (stop valve 70 side) exceeds the set pressure, the pressure reducing valve 69 is opened to allow the flow of pressurized air. When the pressure exceeds the set pressure, the pressure reducing valve 69 is closed, so that the buffer tank 63 is closed. The flow of the pressurized air that is directed is cut off.

  Reference numeral 70 denotes a stop valve provided in the middle of the bypass pipe 67. The stop valve 70 is, for example, a manual valve that is manually opened and closed, and is normally opened. However, when the pressurized air generated in the compressor 22 does not need to be circulated to the bypass pipe 67 and the buffer tank 63 side, an extra load is applied to the pressure reducing valve 69 or the like by closing the stop valve 70, for example. It is a thing which suppresses doing.

  Reference numeral 71 denotes another stop valve provided between the air filter 27 and the air supply valves 33 and 34 and provided in the middle of the dry pipe 26. The stop valve 71 is also constituted by, for example, a manual valve, and is always Has been opened. However, the stop valve 71 is closed as necessary, for example, at the time of maintenance for checking or maintaining the suction unit 28.

  Reference numeral 72 denotes a pressure sensor provided in the air tank 24. The pressure sensor 72 is a predetermined pressure at which the pressure of the pressurized air (compressed air) stored in the air tank 24 is determined in advance, that is, on the adsorption unit 28 side. It is detected whether or not the pressure has been increased to a predetermined pressure (for example, 0.93 MPa) necessary for generating nitrogen gas. When the pressure in the air tank 24 reaches a predetermined pressure, for example, the air supply valves 33 and 34 are opened and closed by a control signal from the control circuit 62, for example, and an adsorption process described later on the adsorption unit 28 side. Then, an extraction process, a pressure equalization process, a regeneration process, and the like are performed.

  The gas generator 21 and the fire extinguishing system using the gas generator 21 according to the present embodiment have the above-described configuration. Next, the operation of generating nitrogen gas by the gas generator 21 will be described.

  First, when the compressor 22 is driven by the electric motor 23 shown in FIG. 2, the compressor 22 sucks air (outside air) from the suction port side and compresses it to generate compressed air. The compressed air is temporarily stored in the air tank 24 from the discharge side of the compressor 22, and thereafter moisture is removed while passing through the dryer 25, and to the adsorption unit 28 via the dry pipe 26. And introduced.

  Next, the adsorption unit 28 separates nitrogen gas and oxygen gas in the compressed air by sequentially repeating the adsorption process, the extraction process, the pressure equalization process, and the regeneration process in the adsorption tanks 31 and 32 as follows. The generation operation of nitrogen gas is executed.

  That is, the adsorption step is to introduce the compressed air from the air tank 24 into the adsorption tanks 31 and 32 filled with the adsorbent, and to return the nitrogen gas remaining in the nitrogen tank 45 to the adsorption tanks 31 and 32. This is a step of increasing the pressure in the adsorption tanks 31 and 32 and adsorbing oxygen molecules to the adsorbent using the pressure at this time. Further, the next extraction step is a step of continuously introducing compressed air into the adsorption tanks 31 and 32 following the adsorption process, and simultaneously taking out nitrogen gas separated and generated by the adsorbent from the adsorption tanks 31 and 32. It is.

  Next, the pressure equalization step refers to supplying the residual gas having a high nitrogen concentration remaining in the adsorption tanks 31 and 32 to the other adsorption tanks 31 and 32 before the adsorption process after the extraction process is completed. This is a process for equalizing the pressure between 32 and increasing the adsorption efficiency of the next adsorption process to generate higher purity nitrogen gas. The regeneration step is a step of regenerating the adsorbent by desorbing oxygen molecules adsorbed on the adsorbent by releasing the atmosphere in the adsorption tanks 31 and 32 using the vacuum pump after completion of the pressure equalization step or by reducing the pressure with a vacuum pump. It is.

  The adsorption unit 28 repeats the adsorption process, the extraction process, the pressure equalization process, and the regeneration process for each of the adsorption tanks 31 and 32 to separate and generate nitrogen gas, and is taken out of the adsorption tanks 31 and 32. Nitrogen gas is stored in the nitrogen tank 45.

  In this case, in the 2nd adsorption tank 32, an adsorption process, an extraction process, and a pressure equalization process are performed first, whereas in the 1st adsorption tank 31, the 2nd adsorption tank 32 is an adsorption process, an extraction process. The regeneration process is executed during the process, and the pressure equalization process with the second adsorption tank 32 is executed after the regeneration process is completed.

  And in the adsorption | suction process of the 2nd adsorption tank 32, the air supply valve 34 and the extraction valve 44 by the side of the 2nd adsorption tank 32 are opened. As a result, compressed air as pressurized air is supplied from the compressor 22 to the second adsorption tank 32, and the nitrogen gas in the nitrogen tank 45 flows back through the outlet pipe 42 from the upper part (downstream side). Reflux in 32. As a result, the second adsorption tank 32 is in a pressurized state by the gas flowing in from above and below the compressed air from the compressor 22 and the nitrogen gas in the nitrogen tank 45, and the internal adsorbent (molecular sieve carbon). Oxygen is adsorbed on the surface.

  On the other hand, the regeneration process is executed in the first adsorption tank 31, and the exhaust valve 38 is in a depressurized state, and the adsorbed oxygen is desorbed and discharged.

  Next, in the extraction process of the second adsorption tank 32, the compressed air is supplied to the second adsorption tank 32 while the air supply valve 34 and the extraction valve 44 on the second adsorption tank 32 side are kept open after the adsorption process. Therefore, the pressure in the second adsorption tank 32 becomes higher than the pressure in the nitrogen tank 45, and the nitrogen gas in the second adsorption tank 32 is taken out. At this time, the first adsorption tank 31 remains in the decompression state in which the exhaust valve 38 is opened.

  Next, in the pressure equalizing step, the pressure equalizing valves 48 and 49 are opened, and the air supply valve 34, the extraction valve 44, and the exhaust valve 38 are closed. As a result, the adsorption tanks 31, 32 and the air tank 24 (compressor 22) are blocked, the adsorption tanks 31, 32, and the nitrogen tank 45 are blocked, and the adsorption tanks 31, 32 communicate with each other. To do. As a result, the nitrogen gas remaining in the second adsorption tank 32 is recovered in the first adsorption tank 31, and the pressure in each of the adsorption tanks 31 and 32 becomes equal.

  As described above, the first half of one cycle is completed, and then the second half cycle is performed by opening the air supply valve 33, the extraction valve 43, and the exhaust valve 39 on the first adsorption tank 31 side. These steps are repeated. In the latter half cycle, the first adsorption tank 31 performs the adsorption process, the extraction process, and the pressure equalization process, whereas in the second adsorption tank 32, the first adsorption tank 31 functions as the adsorption process and the extraction process. The regeneration process is executed during the process, and the pressure equalization process with the first adsorption tank 31 is executed after the regeneration process is completed.

  As described above, the control circuit 62 repeats the above-described cycles, thereby supplying the raw material gas (compressed air) supplied from the compressor 22 and the air tank 24 side in the adsorption tanks 31 and 32 and the other gas. The nitrogen gas separated into the gas (oxygen gas) and separated in the adsorption tanks 31 and 32 is stored in the nitrogen tank 45.

  Further, the control circuit 62 measures the nitrogen gas concentration in the nitrogen tank 45 by the concentration sensor 53 with the nitrogen take-off valve 57 closed when the gas generator 21 (compressor 22) is started. Until the nitrogen concentration in the nitrogen tank 45 exceeds a predetermined specified concentration (for example, 99.9%) determined in advance, the control circuit 62 opens the discharge valve 60 to reduce the low concentration in the nitrogen tank 45. The nitrogen gas is discharged from the exhaust pipe 59.

  Then, when the nitrogen concentration in the nitrogen tank 45 subsequently increases and exceeds a predetermined specified concentration, the control circuit 62 closes the discharge valve 60 and opens the nitrogen extraction valve 57. Thereby, the high concentration nitrogen gas stored in the nitrogen tank 45 is supplied into the buffer tank 63 through the nitrogen extraction pipe 51, the nitrogen extraction valve 57, the flow rate adjustment valve 58 and the check valve 64.

  Next, the nitrogen gas stored in the buffer tank 63 is discharged from the supply pipe 10 to the secondary side pipe 15 through the primary side pipe 9 and the alarm valves 13 and 14 by opening the switching valve 12 shown in FIG. 17 (see FIG. 1). Since the nitrogen gas supplied into the secondary side pipes 15 and 17 is a so-called low activity gas, oxides are contained in the secondary side pipes 15 and 17 (including the primary side pipe 9) in the building 1. It is possible to suppress the occurrence of rust, and it is possible to prevent the water for fire extinguishing in the event of a fire from being disturbed by rust and preventing the water discharge performance from deteriorating.

  By the way, the fire extinguishing equipment including the water supply pump 6, the fire extinguishing water tank 5, the piping line 8, etc. in the building 1 includes all electrical equipment (for example, the electric motor 23 of the gas generator 21, the adsorption unit 28, etc.) at the time of periodic inspection. ) Is temporarily stopped, and at this time, the gas (nitrogen gas) in the primary side pipe 9 and the secondary side pipes 15 and 17 may be released into the atmosphere from the end valves 19 and 20 or the like.

  Then, when the electric motor 23 of the gas generator 21 starts to operate again from the paused state after the periodic inspection or the like is finished, the pressure in the secondary side pipes 15 and 17 is adjusted so that it can be dealt with early when a fire occurs. It is required to increase the pressure to a specified pressure within a predetermined time (for example, about 30 minutes).

  However, in order to generate nitrogen gas by the adsorption unit 28 (nitrogen gas generator) of the gas generator 21, after the pressure in the air tank 24 is increased to a predetermined pressure (for example, 0.93 MPa) as described above, It is necessary to repeat the adsorption process, the extraction process, the pressure equalization process, and the regeneration process sequentially in the adsorption tanks 31 and 32. For example, the pressure in the buffer tank 63 is reduced by nitrogen gas within a predetermined time after the operation of the compressor 22 or the like is started. In practice, it is very difficult to increase the pressure to a specified pressure (for example, 0.3 MPa).

  Therefore, in the present embodiment, the gas supply process for the primary side pipe 9 and the secondary side pipes 15 and 17 using the gas generator 21 is performed according to the processing procedure shown in FIG. The pressure in the primary side pipe 9 can be increased to a specified pressure (for example, 0.3 MPa) at an early stage, and the pressure in the secondary side pipes 15 and 17 is also set to a predetermined specified pressure (for example, 0.1 MPa). ) Can be boosted early.

  That is, the gas supply process shown in FIG. 3 is performed, for example, when the gas generation device 21 starts to operate again from a halt state after the end of periodic inspection or the like. First, in step 1, the power supply of the gas generation device 21 is turned on. It is determined whether or not the battery has been inserted, and when it is determined “YES”, since it is during re-operation, the process proceeds to the next step 2.

  In step 2, the operation of the compressor 22 is started by the electric motor 23, and the refrigeration dryer 25 is also operated to discharge dry compressed air (pressurized air) into the dry pipe 26. In this state, the stop valves 70 and 71 are opened in advance.

  For this reason, in the next step 3, the pressurized air generated in the compressor 22 is supplied from the dry pipe 26 to the adsorption unit 28 side and also supplied to the buffer tank 63 side via the bypass pipe 67. The pressurized air supplied to the buffer tank 63 is introduced from the outlet 63C into the piping line 8 (the air supply pipe 10, the switching valve 12, and the primary side pipe 9) of the building 1, and the alarm valve 13, 14 to the secondary side pipes 15 and 17 (see FIG. 1).

  As a result, the pressure in the secondary pipes 15 and 17 can be increased to a specified pressure (for example, 0.1 MPa) at an early stage within a predetermined time set by a law such as the Fire Service Act. It is possible to respond quickly to emergency situations such as fires.

  When the pressure in the secondary side pipes 15 and 17 reaches the specified pressure, the portion from the primary side pipe 9 to the buffer tank 63 rises to a pressure of about 0.3 MPa, for example, and the bypass pipe 67 When the inside (between the buffer tank 63 and the pressure reducing valve 69) exceeds the set pressure (for example, about 0.3 MPa) of the pressure reducing valve 69, the pressure reducing valve 69 and the check valve 68 are closed as shown in step 4 and bypassed. The flow of pressurized air to the buffer tank 63 through the pipe line 67 is blocked.

  For this reason, as shown in step 5, the compressed air generated by the compressor 22 is stored in the air tank 24, and when the pressure in the air tank 24 gradually increases and rises to a predetermined pressure (for example, about 0.93 MPa), 2 is detected by the pressure sensor 72, the control circuit 62 shown in FIG. 2 starts the operation of the adsorption unit 28.

  Then, the adsorption unit 28 sequentially repeats the adsorption process, the extraction process, the pressure equalization process, and the regeneration process on the adsorption tanks 31 and 32 side as described above, so that the compression supplied from the air tank 24 side as shown in step 6. Air is separated into nitrogen gas and oxygen gas in the adsorption tanks 31 and 32, and the nitrogen gas generated in the adsorption tanks 31 and 32 is stored in the nitrogen tank 45.

  Next, in step 7, while the concentration sensor 53 detects whether or not the nitrogen gas in the nitrogen tank 45 has reached a specified concentration, the control circuit 62 discharges at the stage where the detected concentration reaches the specified concentration. By closing the valve 60 and opening the nitrogen extraction valve 57, the high concentration nitrogen gas stored in the nitrogen tank 45 is supplied to the nitrogen extraction pipe 51, the nitrogen extraction valve 57, the flow rate adjustment valve 58 and the reverse. The liquid is supplied into the buffer tank 63 through the stop valve 64.

  In the next step 8, the pressure sensor 65 monitors whether or not the pressure in the buffer tank 63 (pressure by nitrogen gas) has been increased to an upper limit set pressure of, for example, about 0.55 MP. When the pressure reaches the upper limit set pressure, the operation of the compressor 22 by the electric motor 23 is stopped, and the operation of the refrigeration dryer 25 and the adsorption unit 28 is also stopped.

  However, the pressure in the secondary side pipes 15 and 17 shown in FIG. 1 decreases below the specified pressure over time because, for example, a slight gas leak occurs on the sprinkler heads 16 and 18 side. There is. In such a case, the gas in the buffer tank 63 (mainly nitrogen gas, partly containing pressurized air) is the supply pipe 10, the switching valve 12, the primary side pipe 9, the alarm valve 13, 14, the secondary pipes 15 and 17 are replenished via 14.

  Since the pressure in the buffer tank 63 gradually decreases as the replenishment process is repeated, in step 9, whether or not the pressure in the buffer tank 63 has decreased to a lower limit set pressure of, for example, about 0.35 MP. The supply of nitrogen gas is resumed when the pressure in the buffer tank 63 drops to the lower limit set pressure. When resuming the supply of nitrogen gas, the same processing as in step 2 and steps 5 to 7 is performed (not shown).

  That is, the operation of the compressor 22 and the dryer 25 is restarted in the same manner as in Step 2 described above, and then the operation of the adsorption unit 28 is started after the internal pressure of the air tank 24 reaches a predetermined pressure (Step 5). Nitrogen gas is generated (step 6), and when the concentration reaches a specified concentration, nitrogen gas is supplied (step 7).

  In step 10, it is determined whether or not the power source of the gas generator 21 has been shut off. During the determination of “NO”, the processes in and after step 8 are repeated. And when it determines with "YES" at step 10, since the power supply of the gas generator 21 is interrupted | blocked, all the processing operations are complete | finished.

  Thus, according to the present embodiment, the adsorption unit 28 for generating nitrogen gas is bypassed between the air tank 24 on the compressor 22 side and the buffer tank 63, and is directed from the air tank 24 into the buffer tank 63. A bypass conduit 67 for circulating the pressurized air is provided, and in the middle of the bypass conduit 67, the pressurized air is allowed to flow in the bypass conduit 67 from the air tank 24 toward the buffer tank 63, and vice versa. A check valve 68 that prevents the flow in the direction and a pressure reducing valve 69 that suppresses the pressure in the bypass pipe 67 to a set pressure (for example, about 0.3 MPa) or less between the check valve 68 are provided. .

  Thereby, when the bypass pipe 67 is blocked from the buffer tank 63 by the check valve 68 and the pressure reducing valve 69, the nitrogen gas generated in the adsorption tanks 31 and 32 of the adsorption unit 28 is removed from the nitrogen tank 45. While sequentially storing in the buffer tank 63, the alarm valve 13 directs the nitrogen gas in the buffer tank 63 toward the piping line 8 (primary side piping 9 and secondary side piping 15, 17) of the building 1 that is the supply target. , 14 can be supplied.

  When the amount (or pressure) of nitrogen gas to be supplied to the supply object is insufficient, the pressure in the buffer tank 63 is lower than the set pressure of the pressure reducing valve 69, so that the check valve 68 is opened. Thus, the bypass pipe line 67 is communicated with the buffer tank 63. As a result, the pressurized air can be circulated from the air tank 24 into the buffer tank 63 by bypassing the adsorption unit 28 in the bypass pipe 67, and the pressurized air at this time is sequentially passed into the buffer tank 63. While storing, the pressurized air (compressed air) in the buffer tank 63 can be supplied toward the supply object.

  As a result, for example, when periodically checking the fire extinguishing system of the building 1, when the fire extinguishing equipment including the gas generating device 21 is temporarily suspended and starts to operate again, the piping line 8 (primary piping 9 and The shortage of nitrogen gas to be supplied to the secondary pipes 15 and 17) via the alarm valves 13 and 14 can be covered by pressurized air as described above, and the pressure on the supply object side is pressurized air. Can be boosted early. And the secondary side piping 15 and 17 side pressure in the building 1 can be rapidly raised to a specified pressure, and an emergency such as the occurrence of a fire can be dealt with early.

  Therefore, the pressure in the supply object (for example, the piping line 8 on the fire extinguishing equipment side) is increased to the specified pressure at an early stage by effectively utilizing the compressor 22 and the air tank 24 attached to the gas generator 21. It is possible to improve safety and reliability in the event of a fire.

  Moreover, the installation space of the whole gas generator 21 can be made small compared with a prior art, and the whole apparatus 21 can be reduced in size and weight. And it can suppress that the number of parts of the gas generator 21 increases, and can improve workability | operativity at the time of an assembly or a maintenance.

  In the above embodiment, the case where the check valve 68 and the pressure reducing valve 69 are provided in the middle of the bypass pipe 67 has been described as an example. However, the present invention is not limited to this. For example, valve means (for example, a check valve 68 and a pressure reducing valve 69) may be provided on the inflow port 63B side of the buffer tank 63, or a valve may be provided on the outflow side of the dryer 25. It is good also as a structure which provides a means. In short, the valve means may be provided in the flow path between the buffer tank 63 including the bypass pipe 67 and the compressor 22 (dryer 25).

  Moreover, in the said embodiment, the case where the fire extinguishing system was applied to the building 1 of the (n-1)-(n + 1) floor was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and can be widely applied as a fire extinguishing system to, for example, a one-story or two-story building, a three-story or more building, a middle or high-rise building, and the like.

  Moreover, in the said embodiment, the case where it selectively connected and cut off between the water supply pipe 7, the air supply pipe 10, and the primary side piping 9 by the switching valves 11 and 12 was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and the water supply pipe 7, the air supply pipe 10, and the primary side pipe 9 may be communicated and blocked using, for example, a directional control valve.

  On the other hand, in the said embodiment, the case where compressed air was dried using the freezing type dryer 25 was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and may be a dryer using a desiccant such as silica gel as long as it can dehumidify the moisture in the compressed air.

  Moreover, in the said embodiment, the gas generator 21 which consists of the PSA type adsorption | suction unit 28 which has a pair of adsorption tanks 31 and 32 as a nitrogen gas generator was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, as long as it has a blocking means for blocking between the compressor and the adsorption tank, it may have a configuration having one or two or more adsorption tanks. is there.

1 is an overall configuration diagram showing a building fire extinguishing system to which a gas generator according to an embodiment of the present invention is applied. It is a block diagram which shows the gas generator in FIG. It is a flowchart which shows the operation | movement procedure of the gas supply process by this Embodiment.

Explanation of symbols

1 Building (Building)
2, 3, 4 Internal space 5 Fire extinguishing water tank (fire extinguishing equipment)
6 Water supply pump (fire extinguishing equipment)
7 Water supply pipe (fire extinguishing equipment)
8 Piping line (fire extinguishing equipment)
9 Primary piping (fire extinguishing substance supply piping, gas supply piping)
10 Air supply pipe (gas supply pipe)
11, 12 Switching valve 13, 14 Alarm valve (valve device)
15, 17 Secondary piping (outflow piping)
16, 18 Sprinkler head (discharge port)
19, 20 End valve 21 Gas generator (gas supply source)
22 Air Compressor 24 Air Tank 25 Dryer 26 Dry Piping 28 Adsorption Unit (Nitrogen Gas Generator)
63 Buffer tank (tank)
65, 72 Pressure sensor 67 Bypass line 68 Check valve (valve means)
69 Pressure reducing valve (valve means)

Claims (4)

In a gas generator comprising: an air compressor that compresses air; and a nitrogen gas generator that generates nitrogen gas by separating oxygen from compressed air generated by the air compressor,
The nitrogen gas generator is connected to a tank for temporarily storing the nitrogen gas generated by the nitrogen gas generator before supplying it to the supply object,
Between the air compressor and the tank, a bypass pipe for bypassing the nitrogen gas generator and allowing compressed air to flow in the tank is provided,
A gas generator comprising: a valve means for communicating and blocking the bypass line with respect to the tank in a flow path between the air compressor and the tank including the bypass line.   The valve means is provided between the check valve and the air compressor, and a check valve that allows compressed air to flow from the air compressor toward the tank and prevents a reverse flow. The gas generator according to claim 1, comprising a pressure reducing valve that suppresses the pressure in the bypass line to a predetermined set pressure or less.   The gas supply device according to claim 1 or 2, wherein the supply object is configured by a piping line of a fire extinguishing facility that is disposed in a building and discharges a fire extinguishing substance from a discharge port when a fire occurs. Fire extinguishing equipment that disposes a piping line having a discharge port in a building and releases a fire extinguishing substance from the discharge port of the piping line in the event of a fire,
An air compressor that compresses air, a nitrogen gas generator that generates nitrogen gas by separating oxygen from the compressed air generated by the air compressor, and temporarily stores the nitrogen gas generated by the nitrogen gas generator A gas generator comprising a tank,
The inflow side of the piping line is configured to connect the outflow side of the tank of the gas generator in order to selectively introduce nitrogen gas and pressurized air in addition to the fire extinguishing substance,
Between the air compressor and the tank, a bypass pipe for bypassing the nitrogen gas generator and allowing compressed air to flow in the tank is provided,
A fire extinguishing system using a gas generator configured to provide a valve means for communicating and blocking the bypass pipe with respect to the tank in a flow path between the air compressor and the tank including the bypass pipe.

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