JP2012040263A - Pre-operation type fire extinguishing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pre-operation type fire extinguishing system competent for fire fighting activities even if a wire connecting the pressure supervision switch for detecting pressure lowering at the secondary side of the system should be disconnected.SOLUTION: In a pre-operation type fire extinguishing system where a pre-operation water flow detector 6' has a closed type sprinkler head 3 at its secondary side, this system includes a first wire disconnection detection circuit 23b to detect the disconnection of connection wire L1 of a fire sensor 20 and issue a first disconnection detection signal S2, and a second disconnection detection circuit 25b to detect the disconnection of connection wire L2 of a secondary-side lowered pressure supervision switch PS3 and issue a second disconnection detection signal S4. Either if a lowered pressure detection signal S3 is detected in the situation while the first disconnection detection signal S2 is detected, or if a fire sensing signal S1 is detected while the second disconnection detection signal S4 is detected, the pre-operation type water flow detector 6' opens the main valve to supply fire extinguishing water from a water reservoir 27 to the sprinkler head 3 through the main valve.

Description

  The present invention relates to a pre-acting fire extinguishing equipment suitable for use in sprinkler equipment such as office buildings, apartment houses, and hotels.

  Conventionally, various types of fire extinguishing equipment using a pre-actuated water flow detector (2-step valve) have been proposed for sprinkler equipment such as office buildings. This type of fire extinguishing system is pre-actuated by opening the main valve (main valve) by detecting two operating states: fire detector activation due to heat or smoke and sprinkler head opening due to heat (firing). This is a device that performs fire-extinguishing operation by supplying fire-extinguishing water under pressure from the primary side to the secondary side sprinkler head.

  In such a device, a plurality of fire detectors are connected by a connection line and electrically connected to the control panel through the connection line. When heat or smoke is detected in any of the fire detectors, a detection is generated from the detector. The signal is detected by the control panel through the connection line, and based on this, the main valve of the pre-actuated water flow detection device is opened to supply primary side fire extinguishing water to the secondary side piping, and then the fire pump An operation is performed in which the fire extinguishing water in the fire extinguishing water tank is pressurized and supplied to the sprinkler head by driving (Patent Document 1).

JP-A-6-105927

  By the way, in the fire extinguishing equipment, when the connection line connecting the plurality of fire detectors is broken and the detection signal at the fire detector becomes undetectable by the control panel, the pre-acting flowing water detection is performed. Since the main valve of the apparatus is not opened, there is a problem that the fire extinguishing operation is not performed.

  For this reason, when the disconnection detection circuit detects that the connection line of the fire sensor has been disconnected, and the sprinkler head is opened due to a fire and the pressure on the secondary side drops due to a fire, the pressure is reduced. This is detected by a detection switch, etc., so that the main valve of the pre-actuated water flow detector is opened, and the fire extinguishing operation by the sprinkler head is performed even when the connection line of the fire detector is broken. A pre-acting fire extinguishing equipment configured as described above has been proposed (Patent Document 1).

  However, the above-mentioned conventional fire extinguishing equipment is a pre-operated water flow detection device in the emergency situation of fire sensor disconnection detection, when both conditions of fire sensor disconnection detection and pressure drop detection of the pressure detection switch are satisfied. The main valve is opened, so that the disconnection of the connecting wire constituting the pressure detection switch occurs, and the secondary pressure drop due to the opening of the sprinkler head cannot be detected. It is predicted that the pre-actuated water detection device will not be opened and fire extinguishing activities will not be performed.

  Therefore, as a pre-acting fire extinguishing equipment, it is desired to realize equipment that can surely perform fire extinguishing activities not only in the case of disconnection of the connection line of the conventional fire detector but also in other unexpected situations. .

  The present invention has been made in view of the above-described conventional problems, and not only disconnection of the connection line of the fire detector but also disconnection of the connection line of the pressure monitoring switch that detects a pressure drop on the secondary side. However, it aims at providing the pre-operation type fire extinguishing equipment comprised so that a fire extinguishing activity might be performed reliably.

  In addition, if both the fire sensor connection line and the pressure monitoring switch connection line are disconnected, if a fire has occurred while suppressing the occurrence of water damage due to fire extinguishing water when no fire has occurred, An object of the present invention is to provide a pre-acting fire extinguishing equipment that can perform fire extinguishing activities reliably.

In order to achieve the above object, the present invention
First, the primary side pipe is connected to the pre-actuated running water detection device in the closed state of the main valve, and the secondary side pipe provided with a closed sprinkler head is connected to the detection device. Provided with a secondary side decompression monitoring switch for detecting the decompression of the fire, and the pre-operation type based on the fire detection signal based on the fire detection of the fire detector and the decompression detection signal of the secondary side decompression monitoring switch due to the opening of the sprinkler head. In a pre-acting fire extinguishing system having a pre-acting control unit for opening the main valve of the flowing water detection device, a first disconnection detection circuit for detecting a disconnection of a connection line of the fire detector and generating a first disconnection detection signal And providing a second disconnection detection circuit for detecting a disconnection of the connection line of the secondary decompression monitoring switch and generating a second disconnection detection signal, and detecting the first disconnection detection signal, Depressurization above A main valve for opening the main valve of the pre-operated running water detection device when detecting a fire signal when detecting a discharge signal or when detecting the second disconnection detection signal. A main valve opening means for generating a valve opening signal is provided.

  The primary side pipe is constituted by a primary side pipe (2) and the like. The secondary side pipe is constituted by a secondary side pipe (5), a sprinkler pipe (4) and the like. The secondary side depressurization monitoring switch can be constituted by, for example, a secondary side charging pressure monitoring switch (PS3). The pre-acting flowing water detection device includes, for example, a valve body (6) having a main valve (10), bypass pipes (11a, 12), a detection pipe (13), a control pipe (15), and an electric valve for opening the main valve. It can be constituted by a valve (14) or the like. The first disconnection detection signal can be constituted by a disconnection detection signal (S2). The first disconnection detection circuit can be constituted by a disconnection detection circuit (23b). The second disconnection detection signal can be constituted by a disconnection detection signal (S4). The second disconnection detection circuit can be constituted by a disconnection detection circuit (25b). The main valve opening means can be constituted by, for example, an OR circuit (24a, 24b) and an AND circuit (24c). The main valve opening signal can be constituted by a drive signal (S7). With this configuration, the main valve opening means is not only activated when a fire detection signal is detected not only when the connection line of the fire detector is disconnected but also when the connection line of the secondary pressure reduction monitoring switch is disconnected. When the closed sprinkler head is opened due to the heat of the fire in such a state that the main valve is open, for example, on the primary side piping based on the discharge of fire extinguishing water from the head Fire extinguishing activities can be performed quickly by driving a fire extinguishing pump or the like based on the pressure drop and supplying pressurized water to the piping. In this way, fire extinguishing activities can be performed without hindrance not only when the connection line of the fire detector is disconnected but also when the connection line of the secondary decompression monitoring switch is disconnected.

  Second, the main valve opening means detects the main valve for opening the main valve of the pre-actuated running water detection device when both the first disconnection detection signal and the second disconnection detection signal are detected. The pre-acting fire extinguishing equipment according to the first aspect is characterized by generating a valve opening signal.

  With this configuration, in an emergency situation in which the connection line of the fire detector is disconnected and the connection line of the secondary decompression monitoring switch is disconnected at the same time, the main valve opening means detects these and detects the pre-operated water flow detection. Since the main valve of the device is opened, in such a situation, when a fire occurs and the closed sprinkler head is opened, it is based on, for example, the pressure drop of the piping on the primary side based on the discharge of fire-extinguishing water from the head. Fire extinguishing activities can be performed quickly by driving a fire extinguishing pump or the like to supply water under pressure to the piping. Thus, even in an emergency situation where both the connection line of the fire detector and the connection line of the secondary-side decompression monitoring switch are disconnected, the fire can be extinguished without any trouble if a fire occurs. In addition, since the sprinkler head is kept closed in a state where no fire has occurred, water damage does not occur even if the main valve of the pre-actuated water flow detector is opened.

  Third, the primary side pipe is connected to the pre-actuated running water detection device in the closed state of the main valve, and the secondary side pipe provided with a closed sprinkler head is connected to the detection device. Provided with a secondary side decompression monitoring switch for detecting the decompression of the fire, and the pre-operation type based on the fire detection signal based on the fire detection of the fire detector and the decompression detection signal of the secondary side decompression monitoring switch due to the opening of the sprinkler head. In a pre-acting fire extinguishing system having a pre-acting control unit for opening the main valve of the flowing water detection device, a first disconnection detection circuit for detecting a disconnection of a connection line of the fire detector and generating a first disconnection detection signal And a second disconnection detection circuit for detecting a disconnection of the connection line of the secondary decompression monitoring switch and generating a second disconnection detection signal, and providing the first disconnection detection signal and the second disconnection detection signal. Together When composed of pre-actuated fire extinguishing systems, characterized in that is provided with a main valve opening means for generating a main valve opening signal for opening the main valve of the pre-activated water flow detection device.

  With this configuration, as in the case of the second aspect of the invention, in the emergency situation where both the connection line of the fire detector and the connection line of the secondary pressure reduction monitoring switch are disconnected at the same time, the main valve opening means Since the main valve of the pre-actuated water flow detection device is detected and detected, in such a situation, when a fire occurs and the closed sprinkler head opens, for example, based on the release of fire-extinguishing water from the head Fire extinguishing activities can be performed quickly by driving the primary side fire extinguishing pump or the like and supplying pressurized water to the piping. Thus, even in the case of an emergency, fire extinguishing activities can be performed without any trouble if a fire occurs.

  Fourth, the primary side pipe is connected to the pre-actuated running water detection device in the closed state of the main valve, and the secondary side pipe provided with a closed sprinkler head is connected to the detection device, and the secondary side Provided with a secondary side decompression monitoring switch for detecting the decompression of the fire, and the pre-operation type based on the fire detection signal based on the fire detection of the fire detector and the decompression detection signal of the secondary side decompression monitoring switch due to the opening of the sprinkler head. In a pre-acting fire extinguishing system having a pre-acting control unit for opening the main valve of the flowing water detection device, a disconnection detecting circuit for detecting a disconnection of a connection line of the secondary decompression monitoring switch and generating a disconnection detection signal (S4) (25b) and a main valve for opening the main valve of the pre-actuated running water detection device when the fire detection signal is detected in the state where the disconnection detection signal (S4) is detected. It is provided with a main valve opening means for generating a signal release constituted by pre-actuated fire extinguishing equipment according to claim.

  If comprised in this way, a main valve open | release means will open the main valve of a pre-acting type | formula flowing water detection apparatus, when a fire detection signal is detected in the state in which the connection line of the secondary side pressure reduction monitoring switch was disconnected. Therefore, when the closed sprinkler head is opened by the heat of the fire in such a main valve open state, the fire extinguishing activity can be performed quickly in the same manner.

  Fifthly, in the state where the main valve of the pre-actuated running water detection device is open, the fire pump is driven and the primary side is driven based on the pressure drop of the primary side pipe based on the opening of the closed sprinkler head. This pipe is provided with a fire-extinguishing pump driving means for supplying fire-extinguishing water under pressure. The pre-acting fire extinguishing equipment according to any one of the first to fourth aspects is provided.

  The fire pump driving means is connected to the pressure tank (T) of the primary side pipe and the pressure tank (T), and when a pressure drop in the primary side pipe is detected, a fire water storage tank (27 ) Or the like, and a primary side pressure reduction monitoring switch (PS4) for driving a fire extinguishing pump (P) for supplying pressurized fire extinguishing water. With this configuration, when the closed sprinkler head is opened due to a fire in a state where the main valve of the pre-actuated running water detection device is open, fire extinguishing water is discharged from the head via the primary side pipe and the secondary side pipe. Therefore, fire fighting can be performed quickly.

  Since the present invention is configured as described above, not only when the connection line of the fire detector is disconnected, but also when the connection line of the secondary decompression monitoring switch is disconnected, the fire extinguishing activity is detected when the fire detection signal is detected. Therefore, a highly safe pre-acting fire extinguishing equipment is realized.

  Even if the connection line of the fire detector is disconnected and the connection line of the secondary pressure reduction monitoring switch is disconnected at the same time, the main valve opening means detects these and opens the main valve of the pre-actuated water flow detector. Therefore, in the event of a fire in such an emergency situation, it is possible to perform fire extinguishing activities and realize a highly safe pre-acting fire extinguishing equipment.

  In addition, when the connection line of the secondary decompression monitoring switch is disconnected, fire extinguishing activities are possible when a fire detection signal is detected, thus realizing a highly safe pre-acting fire extinguishing system. Is.

  In addition, in the state where the main valve of the pre-actuated water flow detection device is open, fire extinguishing water is not discharged as long as the closed sprinkler head is kept closed, so that occurrence of water damage can also be suppressed. .

  In addition, when the closed sprinkler head is opened due to a fire when the main valve of the pre-operated running water detector is open, fire extinguishing activities can be performed quickly based on the driving operation of the fire pump of the fire pump driving means. It is.

It is a piping lineblock diagram centering on the pre-operation type running water detection device of the pre-operation type fire extinguishing equipment concerning the present invention. It is a whole block diagram including the electric structure of the fire extinguishing equipment same as the above. It is a whole block diagram including the electric structure of the fire extinguishing equipment same as the above. (A) and (B) are specific configuration diagrams of the disconnection detection circuit. It is a functional block diagram of the control means containing the main valve opening means in the fire extinguishing equipment same as the above.

  First, the pre-operated fire extinguishing equipment according to the present invention will be described with reference to FIG.

  This pre-operated fire extinguishing system 1 includes a primary side pipe 2 connected to a fire water storage tank 27 and a fire extinguishing pump P (see FIG. 2 and FIG. 3), a closed sprinkler head 3 A wet pre-actuated water flow detection device 6 comprising a secondary pipe 5 connected to a sprinkler pipe 4 connected to the valve, and a valve body 6 interposed between the primary pipe 2 and the secondary pipe 5. It consists of '. The valve body 6 of the pre-actuated running water detection device 6 ′ has a control chamber 7 provided through the opening 6a between the primary valve chamber 6b and the secondary valve chamber 6c. ing. The valve body 6 has a rod 8 fixed to the housing 7a of the control chamber 7, and is urged in the direction of the opening 6a by a spring 9 attached to the rod 8, and comes into contact with the opening 6a. It has a main valve 10 that always closes the opening 6a.

  Reference numeral 10 a denotes an annular diaphragm that supports the main valve 10 slidably along the rod 8. The pre-acting fire extinguishing equipment 1 is configured so that, in a fire alarm state, the primary side pipe 2, the primary side valve chamber 6b, the secondary side pipe 5, the secondary side valve chamber 6c, and the control chamber 7 have extinguishing water (the valve shown in FIG. 1). Therefore, a so-called wet fire extinguishing system is constructed in which fire extinguishing water is filled through the sprinkler pipe 4 to the end of the closed sprinkler head 3.

  When PS1 detects flowing water in the vicinity of the opening 6a based on the opening of the main valve 10, it detects this via the pipe 10b and displays it on the pre-operation control unit 24 (see FIGS. 2 and 3) described later. PS2 is connected to the secondary valve chamber 6c for sending an alarm signal to be used for use, etc., and the secondary side valve chamber 6c is opened by the closed sprinkler head 3 being opened (fired) and discharged. When the secondary side pressure drop is detected, the secondary side reduction alarm pressure monitoring switch PS3 which sends a signal for display or the like to the pre-operation controller 24 is also connected to the secondary side valve chamber 6c, and is connected to the sprinkler. A secondary that sends a detection signal (detection current I2) to the pre-operation control unit 24 when a pressure drop on the secondary side such as the secondary valve chamber 6c due to the head 3 being opened (fired) and discharging water is detected. Pressure monitoring switch for side charging (Secondary pressure reduction monitoring switch), PS4 (FIG. 2) for detecting the pressure reduction of the primary side pipe 2 due to the opening (firing) of the closed sprinkler head 3 via the pressure tank T connected to the pipe 2 When the pressure monitoring switch PS4 detects the decompression of the primary side pipe 2, the pressure monitoring switch PS4 drives the fire extinguishing pump P to supply the fire extinguishing water in the fire extinguishing water storage tank 27 to the primary side pipe 2 under pressure. Water.

  The primary valve chamber 6b and the secondary valve chamber 6c of the valve body 6 are connected by a bypass pipe 11a, and a secondary-side water filling manual valve 11 is provided in the bypass pipe 11a. A bypass pipe 12 is connected between the primary side valve chamber 6b and the secondary side valve chamber 6c in parallel with the secondary side filling manual valve 11. The bypass pipe 12 is provided with a secondary-side water-filling electric valve 17, and the bypass pipes 11 a and 12 are connected to a main valve opening electric valve 14 via a detection pipe 13 and are detected. The service pipe 13 is connected to the control chamber 7 through a control pipe 15 from a branch point a in the middle of the pipe line. The main valve opening motor-operated valve 14 is connected to a drain pipe 16. A drain valve 18 is connected to the secondary valve chamber 6 c of the valve body 6 and is connected to the drain pipe 19.

  In FIG. 1, 28a is an orifice provided in the detection pipe 13, 28b is a check valve provided in the pipe 13, 29 is an adjustment valve of the control pipe 15, and 30, 31 are pressure monitoring switches. Control valves for PS2 and PS2, 32 is an orifice, 33 is a signal stop valve, 34 is a manual start valve, M1 is a drive motor for the motor valve 14 for opening the main valve, and M2 is a drive for the motor valve 17 for secondary side charging. A motor 35 is a strainer. In the present embodiment, in FIG. 1, the pre-actuated running water detection device is constituted by the bypass pipes 11a and 12, the detection pipe 13, the control pipe 15, the main valve opening electric valve 14 and the like with the valve body 6 as the center. However, the pre-actuated running water detection device is not limited to such a configuration. Based on the detection of a fire by a fire detector, a decompression monitoring switch, etc., the valve body is opened and fire water is supplied from the primary side of the valve body. Includes a device that allows water to be delivered to the sprinkler head.

  In the fire alarm state, the fire pump P is driven to pressurize and supply fire water from the fire water storage tank 27 to the primary side pipe 2, and the fire water is supplied to the primary side pipe 2 and the primary valve chamber 6 b of the valve body 6. The secondary side filling manual valve 11 and the secondary side filling electric valve 17 are opened, and the secondary side of the valve body 6 and the detection pipe 13 are connected via the bypass pipes 11 a and 12. Also fill with fire water. Therefore, the control chamber 7 and the main valve opening motor-operated valve 14 are filled with fire-extinguishing water through the detection pipe 13 and the control pipe 15, and the secondary valve chamber 6c, the secondary pipe 5 and Fire extinguishing water is filled up to the end of the closed sprinkler head 3 through the sprinkler pipe 4. Thereafter, the water filling valves 11 and 17 can be closed to set a fire warning state. At this time, the main valve 10 is in a state where the opening 6a is closed by the urging force of the spring 9 (main valve closed state). The piping of the secondary side reduction alarm pressure monitoring switch PS2 and the secondary side charging pressure monitoring switch PS3 is also filled with extinguishing water.

  Further, the drive motor M1 of the motor valve 14 for opening the main valve and the drive motor M2 of the motor valve 17 for secondary side charging are connected to the pre-operation control unit 24, and the drive motors M1 and M2 are Each drive is controlled by a drive signal from the control unit 24. In addition, in FIG. 1, the pipe part filled with the fire extinguishing water in the fire alert state is shown in black.

  FIG. 2 is an overall configuration diagram of the pre-operation type fire extinguishing equipment 1 including an automatic fire notification section (self-fire information board) 23 and a pre-operation control section (pre-operation control panel) 24, and FIG. It is the whole block diagram which showed the typical structure in detail. In these drawings, a plurality of closed sprinkler heads 3 are connected to the sprinkler pipe 4. These sprinkler heads 3 are installed at appropriate intervals on the ceiling of each floor. The closed sprinkler head 3 has, for example, a glass bulb that is fired by heat. When the glass bulb reaches a predetermined temperature due to the heat of fire from the closed state, the bulb opens and the sprinkler opens. The fire-extinguishing water in the pipe 4 is discharged.

  Also, a heat / smoke detector (hereinafter referred to as “fire detector”) that generates a detection signal by detecting fire heat or fire smoke at a plurality of locations such as the ceiling in the vicinity of the installation position of the sprinkler head 3. A plurality of 20 are installed. As shown in FIG. 3, these fire detectors 20 are connected in parallel to the detector ON signal detection circuit 23 a in the automatic fire alarm unit 23 via a connection line L <b> 1. The configured circuit is referred to as a connection circuit C1. When the installation position of the fire detector 20 is distinguished and described, as shown in FIG. 3, the fire detector 20 is indicated by the symbols 20A, 20B, 20C,. When not distinguishing or showing the whole, it is displayed as a fire detector 20.

  Therefore, when the heat or smoke is detected in any of the fire detectors 20 and the contact point 20a is turned on, the sense current I1 flows in the fire detector 20, and therefore the sense current I1 is sent to the sensor on signal detection circuit 23a. By detecting this, it can be detected that a fire has occurred and one of the fire detectors 20 has been turned on. When detecting the sensing current I1, the sensor ON signal detection circuit 23a sends a fire detection signal S1 to the OR circuit 24a of the pre-operation controller 24.

  A termination resistor R1 is connected in parallel to each fire detector 20 at the end of the connection circuit C1, and the automatic fire alarm unit 23 is configured such that a weak current i1 always flows through the termination resistor R1. . The automatic fire notification unit 23 is provided with a disconnection detection circuit 23b that can detect disconnection of the connection line L1 of the connection circuit C1. This disconnection detection circuit 23b is composed of an ammeter A and a current detection unit 23b 'connected in series to the connection line L1 (see FIG. 4 (a)), and none of the fire detectors 20 is turned on. In the state, the weak current i1 flowing through the termination resistor R1 is constantly detected. Therefore, when the disconnection detection circuit 23b detects the weak current i1, the disconnection detection circuit 23b determines that no disconnection has occurred in the connection circuit C1, and does not send any signal. On the other hand, when the disconnection detection circuit 23b is disconnected at any location of the connection line L1 of the connection circuit C1 and the weak current i1 is de-energized, the current detection unit 23b ' The deactivation of i1 is detected, and a disconnection detection signal (first disconnection detection signal) S2 is sent to the OR circuit 24a of the pre-operation controller 24.

  The secondary side charging pressure monitoring switch (secondary pressure reduction monitoring switch) PS3 is connected to the secondary pressure reduction detection circuit 25a of the detection unit 25 in the pre-operation control unit 24 via a connection line L2. . Specifically, as shown in FIG. 3, the secondary side charging pressure monitoring switch PS3 is connected in parallel to the detection circuit 25a via a connecting line L2, thereby the secondary side charging. A connection circuit C2 including the pressure monitoring switch PS3 is formed.

  When the pressure monitoring switch PS3 detects a pressure drop on the secondary side such as the secondary side valve chamber 6c of the valve body 6 of the pre-actuated flow detection device 6 ', the contact 26 is turned on and the connection is made. The detection current I2 flows through the circuit C2. At this time, the secondary pressure reduction detection circuit 25a detects the detection current I2 and sends a pressure reduction detection signal S3 to the OR circuit 24b in the pre-operation control unit 24.

  Further, a termination resistor R2 is connected to the end of the connection circuit C2 in parallel with the secondary-side charging pressure monitoring force switch PS3, and the detection unit 25 always has a weak current i2 flowing through the termination resistor R2. It is configured as follows. In the detection unit 25, a disconnection detection circuit (second disconnection detection circuit) 25b is provided in the connection line L2 constituting the connection circuit C2. The disconnection detection circuit 25b includes an ammeter A and a current detection unit 25b 'connected in series to the connection line L2 (see FIG. 4B). The disconnection detection circuit 25b constantly detects the weak current i2 flowing through the termination resistor R2 and detects the weak current i2 in a state where the secondary side charging pressure monitoring switch PS3 is not turned on. In this case, it is determined that no disconnection has occurred in the connection circuit C2, and no signal is transmitted. When the current detection unit 25b ′ is disconnected at any location of the connection line L2 of the connection circuit C2, the current detection unit 25b ′ detects the deactivation of the weak current i2 due to the disconnection, and detects a disconnection detection signal (second (Disconnection detection signal) S4 is sent to the OR circuit 24b.

  The pre-operation control unit 24 is connected to the automatic fire notification unit 23, and the secondary-side charging pressure monitoring switch PS3 is connected to the secondary pressure reduction detection circuit 25a of the internal detection unit 25 as described above. The connection circuit C2 is connected via a connection line L2, and the disconnection detection circuit 25b is provided in the connection line L2.

  The pre-operation control unit 24 includes an OR circuit (fire detector detection means) 24a in which the one input terminal is connected to the detector ON signal detection circuit 23a and the other input terminal is connected to the disconnection detection circuit 23b. A detection unit 25 including a secondary pressure reduction detection circuit 25a and a disconnection detection circuit 25b, an OR circuit in which one input terminal is connected to the secondary pressure reduction detection circuit 25a and the other input terminal is connected to the disconnection detection circuit 25b. Secondary pressure detecting means) 24b, and further, AND circuits (driving means) 24c connected to outputs of the OR circuits 24a and 24b, respectively, and the output terminals of the AND circuit 24c are The main valve opening electric valve 14 is connected to a drive motor M1.

  That is, as shown in FIG. 5, the output (fire detection signal S1) of the detector ON signal detection circuit 23a is connected to one input terminal of the OR circuit 24a in the pre-operation control unit 24, and the OR circuit. The output (first disconnection detection signal S2) of the disconnection detection circuit 23b is connected to the other input terminal of 24a. Therefore, when either the fire detection signal S1 or the disconnection detection signal S2 is input to the OR circuit 24a, the OR circuit 24a outputs a high level output signal S5 to one input terminal of the AND circuit 24c. However, when none of the signals S1 and S2 is input, a low level output is obtained.

  An output (decompression detection signal S3) of the secondary pressure depressurization detection circuit 25a is connected to one input terminal of an OR circuit (secondary pressure detecting means) 24b in the pre-operation control unit 24, and the OR circuit. The other input terminal of 24b is connected to the output of the disconnection detection circuit 25b (second disconnection detection signal S4). Therefore, the OR circuit 24b outputs a high-level output signal S6 to the other input terminal of the AND circuit 24c when either the decompression detection signal S3 or the disconnection detection signal S4 is input to the OR circuit 24b. However, when none of the above signals S3 and S4 is input, the output becomes a low level.

  The AND circuit (driving means) 24c has the output of the OR circuit 24a connected to one terminal, the output of the OR circuit 24b connected to the other terminal, and a high level output from the OR circuit 24a. When both the signal S5 and the high level output signal S6 from the OR circuit 24b are input, the drive motor M1 drive signal (main valve release signal) S7 for opening the main valve opening motor-operated valve 14 is used as the drive motor. This is sent to M1, and the drive motor M1 is driven to open the main valve opening motor-operated valve.

  That is, the AND circuit 24c has a high-level output signal S5 from the OR circuit 24a based on the fire detection signal S1 or a connection circuit based on the fire detection signal S1. The connection line L1 of C1 is disconnected, one of the high level output signals S5 from the OR circuit 24a based on the disconnection detection signal S2 is input to one input terminal, and one of the sprinkler heads 3 is opened (fired) The high level output signal S6 from the OR circuit 24b based on the decompression detection signal S3 or the connection line L2 of the connection circuit C2 is disconnected, and the high level output from the OR circuit 24b based on the disconnection detection signal S4. Either of the signals S6 is input to the other input terminal, whereby both the high level output signal S5 and the high level output signal S6 are input. Te, when the AND condition is satisfied, and outputs the drive signal S7.

  Since the present invention is configured as described above, the operation of the present invention will be described next.

  In the fire alarm state (when no fire has occurred), as shown in FIG. 1, the primary side pipe 2 and the valve body 6, the primary side valve chamber 6 b, the secondary side valve chamber 6 c, and the control room 7 are filled with fire-extinguishing water. Further, bypass pipes 11a, 12 connecting the primary side and the secondary side of the valve body 6, pipes to the secondary side charging pressure monitoring switch PS3 and the secondary pressure reduction alarm pressure monitoring switch PS2, and for detection The piping up to the main valve opening motor-operated valve 14 in the piping 13 and the control piping 15 are also filled with fire-extinguishing water. Furthermore, a so-called wet pre-acting fire extinguishing equipment 1 is constructed in which fire extinguishing water is filled from the secondary pipe 5 to the tip of the closed sprinkler head 3 via the sprinkler pipe 4.

  In the fire warning state, the automatic fire notification unit 23 always allows a weak current to flow through the connection circuit C1, and in a state where no disconnection occurs, the disconnection detection circuit 23b causes the weak current to flow through the termination resistor R1. i1 is always detected. Therefore, the disconnection detection signal S2 is not sent from the disconnection detection circuit 23b to the OR circuit 24a of the pre-operation control unit 24.

  Further, in such a fire warning state, the detection unit 25 of the pre-operation control unit 24 always allows a weak current to flow through the connection circuit C2, and in the state where no disconnection has occurred, the disconnection detection circuit 25b has a termination resistance. The weak current i2 flowing through R2 is constantly detected. Therefore, the disconnection detection signal S4 is not sent from the disconnection detection circuit 25b to the OR circuit 24b of the pre-operation control unit 24.

(1) When a fire occurs when no disconnection occurs When a fire occurs and one of the fire detectors 20 detects a fire and the contact 20a is turned on, a sense current I1 flows. The detector ON signal detection circuit 23a of the automatic fire notification unit 23 detects, and the sensor ON signal detection circuit 23a sends a fire detection signal S1 to the OR circuit 24a of the pre-operation control unit 24.

  Then, a high level output signal S5 is sent from the OR circuit 24a to one input terminal of the AND circuit 24c.

  On the other hand, when any of the sprinkler heads 3 in the vicinity of the fire detector 20 turned on by the heat of the fire is opened (fired) by the heat of the fire, the fire-extinguishing water filled in the sprinkler pipe 4 and the secondary side pipe 5 is discharged. Since water is discharged from the sprinkler head 3, the pressure in the secondary side valve chamber 6b and the secondary side pipe 5 of the valve body 6 decreases. Therefore, the secondary side charging pressure monitoring switch PS3 detects the pressure drop on the secondary side, and the contact 26 is turned on. Then, since the detection current I2 flows through the monitoring switch PS3, the secondary pressure reduction detection circuit 25a detects this, and sends a pressure reduction detection signal S3 to one input terminal of the OR circuit 24b. At this time, the pressure monitoring switch PS2 for secondary pressure reduction alarm is also turned on. Based on this, the pre-operation control unit 24 reduces the pressure on the secondary side based on the detection signal from the monitoring switch PS2. An alarm lamp or the like is displayed.

  Then, a high level output signal S6 is sent from the OR circuit 24b to the other input terminal of the AND circuit 24c.

  In the AND circuit 24c of the pre-operation control unit 24, since the AND condition is satisfied by the high level output signals S5 and S6, a drive signal (main valve opening signal) S7 is sent from the AND circuit 24c to the drive motor M1. Thus, the main valve opening motor-operated valve 14 is opened. Therefore, the fire extinguishing water in the detection pipe 13 and the fire extinguishing water in the control chamber 7 flow out to the drain pipe 16 through the motor operated valve 14.

  As a result, the pressure in the control chamber 7 of the valve body 6 of the pre-actuated flowing water detection device 6 ′ is lower than the pressure in the primary side valve chamber 6 b of the valve body 6, so that the pressure in the primary side valve chamber 6 b of the valve body 6 is pushed. Thus, the main valve 10 is opened against the spring 9, whereby the fire extinguishing water in the primary side pipe 2 flows out from the primary side of the valve body 6 to the secondary side through the opening 6 a. That is, the main valve 10 of the pre-actuated running water detector 6 'is opened.

  At this time, the primary side pressure reduction monitoring switch PS4 detects the pressure drop of the primary side pipe 2 via the pressure tank T via the pressure tank T on the upstream side of the primary side pipe 2, and the fire pump P is driven based on this. A signal is sent and the fire pump P is driven. Then, the fire-extinguishing water in the fire-extinguishing water storage tank 27 is pressurized and fed into the primary-side pipe 2 by the fire-extinguishing pump P, so that the fire-extinguishing water is the primary-side pipe 2, the opened valve body 6, and the secondary-side pipe. 5. Water is discharged from the sprinkler head 4 opened through the sprinkler pipe 4, and then water discharge from the sprinkler head 3 is continued, and fire extinguishing activities are continuously performed.

(2) When the connection line L1 of the connection circuit C1 of the fire detector 20 is disconnected When the position X1 (FIG. 3) of the connection line L1 of the connection circuit C1 constituting the fire detector 20 is disconnected in the fire alarm state, Considering the case where a fire has occurred at the installation position of the fire detector 20A on the terminal resistance R1 side from the disconnection position X1, and the contact 20a of the fire detector 20A is turned on, the connection line L1 is disconnected at the position X1. Therefore, even if the contact 20a is turned on, the detection current I1 does not flow, so that the sensor 20A cannot be detected by the sensor on signal detection circuit 23a.

  However, since the weak current i1 is deactivated in the connection circuit C1 due to the disconnection of the connection line L1 at the position X1, the disconnection detection circuit 23b of the automatic fire alarm unit 23 detects the deactivation of the weak current i1 and performs pre-operation. A disconnection detection signal (first disconnection detection signal) S2 is sent to the OR circuit 24a of the control unit 24. Therefore, at the time of such disconnection, it is in a fire-detectable state in which the high-level output signal S5 is input from the OR circuit 24a to one input terminal of the AND circuit 24c.

  Here, when the sprinkler head 3 near the fire detector 20A is opened (fired) due to the heat of the fire, the fire extinguishing water filled in the sprinkler pipe 4 and the secondary side pipe 5 is discharged from the head 3. The pressure in the secondary side valve chamber 6c and the secondary side pipe 5 of the valve body 6 decreases. Therefore, the secondary side charging pressure monitoring switch PS3 detects the secondary side pressure drop and the contact 26 is turned on. Then, since the detection current I2 flows through the pressure switch PS3, the secondary pressure reduction detection circuit 25a of the detection unit 25 of the pre-operation control unit 24 detects this, and sends the pressure reduction detection signal S3 to the OR circuit 24b. Therefore, a high level output signal S6 is sent from the OR circuit 24b to the other input terminal of the AND circuit 24c.

  Then, in the AND circuit 24c of the pre-operation controller 24, the AND condition is satisfied by the high level output signal S5 based on the disconnection detection signal S2 and the high level output signal S6 based on the decompression detection signal S3. A drive signal S7 is sent from the AND circuit 24c to the drive motor M1, and the main valve opening motor-operated valve 14 is thereby opened. Therefore, the fire extinguishing water in the detection pipe 13 and the fire extinguishing water in the control chamber 7 flow out to the drain pipe 16 through the motor operated valve 14.

  Then, as in the above (1), the main valve 10 of the pre-actuated water flow detection device 6 ′ is opened against the spring 9 by being pushed by the pressure of the primary valve chamber 6b of the valve body 6, and thereby the primary Since the fire extinguishing water in the side pipe 2 flows out from the primary side of the valve body 6 to the secondary side through the opening 6a, the primary side pressure reduction monitoring switch PS4 is primary through the pressure tank T on the primary side. A pressure drop in the side pipe 2 is detected and the fire pump P is driven.

  Then, since the fire extinguishing water in the fire extinguishing water storage tank 27 is sent to the primary side pipe 2 by the fire extinguishing pump P, the fire extinguishing water is the primary side pipe 2, the open valve body 6, the secondary side pipe 5, the sprinkler. Water is discharged from the sprinkler head 4 through the pipe 4, and then water is continuously discharged from the sprinkler head 3 to perform fire extinguishing activities.

  In this way, even if a disconnection occurs in the connection line L1 of the connection circuit C1 that connects the plurality of fire detectors 20, a fire extinguishing operation can be performed without any trouble in the event of a fire.

(3) At the time of disconnection of the connection line L2 of the connection circuit C2 of the secondary side charging pressure monitoring switch PS3 Next, in the fire alarm state, the position of the connection line C2 connecting the secondary side charging pressure monitoring switch PS3 Consider the case where X2 is disconnected.

  In such a disconnected state, a fire occurs, and any one of the sprinkler heads 3 fires, and the fire extinguishing water of the secondary side pipe 5 and the sprinkler pipe 4 of the valve body 6 flows out of the sprinkler head 3, thereby Even if the pressure drop is detected by the secondary-side charging pressure monitoring switch PS3 and the contact 26 of the switch PS3 is turned on, the detection current I2 does not flow because the position X2 of the connection line L2 is disconnected. Therefore, the ON of the pressure switch PS3 cannot be detected by the secondary pressure reduction detection circuit 25a of the detection unit 25 in the pre-operation control unit 24.

  However, since the weak current i2 is de-energized in the connection line L2 of the connection circuit C2 due to the disconnection of the position X2, the disconnection detection circuit 25b of the detection unit 25 of the pre-operation control unit 24 eliminates the weak current i2. The disconnection detection signal (second disconnection detection signal) S4 is sent to the OR circuit 24b of the pre-operation control unit 24. Therefore, at the time of the disconnection, the fire detection is possible because the high level output signal S6 is input from the OR circuit 24b to the other input terminal of the AND circuit 24c.

  Here, when the fire detector 20 (fire detector 20B) in the vicinity of the fired sprinkler head 3 detects fire heat or smoke due to the heat of the fire, the contact 20a of the detector 20B is turned on. Therefore, the sensing current I1 flows through the connection circuit C1. Therefore, the detector ON signal detection circuit 23a of the automatic fire notification unit 23 detects the ON of the sensor 20B based on the detection current I1, and sends the fire detection signal S1 to the OR circuit 24a of the pre-operation control unit 24. To do. The OR circuit 24a sends a high level output signal S5 to the AND circuit 24c based on the input of the fire detection signal S1.

  Then, in the AND circuit 24c of the pre-operation control unit 24, the AND condition is satisfied by the high-level output signal S6 based on the disconnection detection signal S4 and the high-level output signal S5 based on the fire detection signal S1. A drive signal S7 is sent from the AND circuit 24c to the drive motor M1, thereby opening the main valve opening motor-operated valve 14, so that the fire-extinguishing water in the detection pipe 13 and the fire-extinguishing water in the control chamber 7 are electrically driven. It flows out to the drain pipe 16 through the valve 14.

  Then, as in the above (1), the main valve 10 of the pre-actuated water flow detection device 6 ′ is opened against the spring 9 by being pushed by the pressure of the primary valve chamber 6b of the valve body 6, and thereby the primary The fire extinguishing water in the side pipe 2 flows out from the primary side of the valve body 6 to the secondary side through the opening 6a, and the primary side pressure reduction monitoring switch PS4 is connected to the primary side through the pressure tank T on the primary side. A pressure drop in the pipe 2 is detected, and the fire pump P is driven.

  Accordingly, the fire-extinguishing water in the fire-extinguishing water storage tank 27 is pressurized and fed to the primary side pipe 2, and the fire extinguishing water passes through the primary side pipe 2, the opened valve body 6, the secondary side pipe 5, and the sprinkler pipe 4. Water is discharged from the head 4, and subsequently, water discharge from the sprinkler head 3 is continued, and fire extinguishing activities are performed.

  Thus, even if the connection line L2 of the connection circuit C2 of the secondary side charging pressure monitoring switch PS3 is disconnected, the fire extinguishing operation can be performed without any trouble in the event of a fire.

(4) When both the connection line L1 of the connection circuit C1 of the fire detector 20 and the connection line L2 of the connection circuit C2 of the secondary side charging pressure monitoring switch PS3 are disconnected

(A) When no fire occurs Considering the case where the position X1 of the connection line L1 of the connection circuit C1 of the fire detector 20 is disconnected, in this case, the weak current i1 is de-energized in the connection line L1, and thus the disconnection is detected. The circuit 23b detects the deactivation of the weak current i1, and sends a disconnection detection signal (first disconnection detection signal) S2 to the OR circuit 24a of the pre-operation control unit 24. Therefore, at the time of the disconnection, the fire detection is possible because the high level output signal S5 is input from the OR circuit 24a to one input terminal of the AND circuit 24c.

  Furthermore, if the position X2 of the connection line L2 of the connection circuit C2 of the secondary side charging pressure monitoring switch PS3 is also disconnected at the same time, the weak current i2 is de-energized in the connection line L2, so the disconnection detection circuit 25b. Detects the deactivation of the weak current i2, and sends a disconnection detection signal (second disconnection detection signal) S4 to the OR circuit 24b of the pre-operation controller 24. Therefore, at the time of such disconnection, the high level output signal S6 from the OR circuit 24b is input to the other input terminal of the AND circuit 24c.

  Then, since the AND circuit 24c satisfies the AND condition by the high level output signals S5 and S6 based on the disconnection detection signals S2 and S4, the AND circuit 24c sends the drive signal S7 to the drive motor M1. The main valve opening motor-operated valve 14 is opened.

  Therefore, the fire extinguishing water in the detection pipe 13 and the fire extinguishing water in the control chamber 7 flow out to the drain pipe 16 through the motor operated valve 14. Then, since the pressure in the control chamber 7 of the valve body 6 is lower than the pressure in the primary side valve chamber 6b of the valve body 6, it is pushed by the pressure of the primary side valve chamber 6b of the valve body 6 and the pre-actuated running water detector 6 The main valve 10 is opened against the spring 9.

  However, no fire has occurred at this time, and none of the closed sprinkler heads 3 is open (fired), so that no water flow from the primary side to the secondary side of the valve body 6 occurs.

  Thus, when the connection lines L1 and L2 of both the connection circuits C1 and C2 are disconnected at the same time, the main valve opening motor-operated valve 14 is driven and the valve body 6 of the pre-actuated running water detection device 6 ′ is driven. The main valve 10 is opened, but water is not discharged from the closed sprinkler head 3, so that water damage due to fire-extinguishing water does not occur.

  At this time, the opening of the main valve 10 is detected by the alarm switch PS1, and an alarm signal is sent to the pre-operation control unit 24. Therefore, the pre-operation control unit 24 displays that the main valve has been opened. Therefore, the operator can recognize the possibility of disconnection of both the connection circuits C1 and C2 based on the display.

(B) When a fire occurs Next, when the connection circuits C1 and C2 are disconnected and the main valve of the valve body 6 is open, a fire actually occurs, and one of the sprinkler heads 3 is opened (fired) ), The primary side (primary side piping 2, primary side valve chamber 6b) and secondary side (secondary side valve chamber 6c, secondary side piping 5, sprinkler piping 4) of the valve body 6 are opened. Since the water is discharged from the sprinkler head 3, the pressure in the primary side pipe 2 is reduced. Therefore, the primary pressure reduction monitoring switch PS4 detects the pressure drop in the primary side pipe 2 via the pressure tank T on the primary side and drives the fire extinguishing pump P.

  Then, the fire-extinguishing water in the fire-extinguishing water storage tank 27 is pressurized and fed to the primary side pipe 2 by the fire extinguishing pump P, so that the fire extinguishing water is the primary side pipe 2, the valve body 6 in the open state, and the secondary side pipe. 5. Water is discharged from the sprinkler head 4 in the firing state through the sprinkler pipe 4, and then water discharge from the sprinkler head 3 is continued to perform fire extinguishing activities.

  As described above, even when the connection line L1 of the connection circuit C1 of the fire detector 20 and the connection line L2 of the connection circuit C2 of the secondary side charging pressure monitoring switch PS3 are both disconnected at the same time, a fire occurs. Thus, when the sprinkler head is opened (fired), the fire extinguishing operation can be surely performed.

  As described above, according to the present invention, not only when the connection circuit C1 of the fire detector 20 is disconnected, but also when the connection circuit C2 of the secondary side charging pressure monitoring switch PS3 is disconnected, there is no problem. Fire fighting can be done.

  Further, when both the connection circuit C1 of the fire detector 20 and the connection circuit C2 of the secondary side water pressure monitoring switch PS3 are disconnected, the valve body 6 of the pre-actuated running water detection device 6 ′ is opened. However, since the fire-extinguishing activity standby state in which the fire-extinguishing water is not discharged from the closed sprinkler head 3 can be set, it is possible to prevent the occurrence of damage or the like due to the fire-extinguishing water in this state.

  In addition, when a fire occurs in such a fire fighting standby state and any of the closed sprinkler heads 3 is opened (fired) by the fire, the fire pump P is driven based on the pressure drop in the primary side pipe 2. Thus, water discharge from the sprinkler head 3 can be started immediately.

  Therefore, according to the present invention, when the connection line L1 of the connection circuit C1 connecting the fire detector 20 is disconnected, when the connection line L2 of the connection circuit C2 connecting the secondary-side charging pressure monitoring switch PS3 is disconnected, In both cases, the connection line L1 of the connection circuit C1 that connects the fire detector 20 and the connection line L2 of the connection circuit C2 that connects the secondary side pressure monitoring switch PS3 are disconnected. When this occurs, there is an effect that fire extinguishing activity by water discharge from the sprinkler head 3 can be reliably performed.

  Since the present invention is configured as described above, not only when the connection circuit C1 of the fire detector 20 is disconnected, but also when the connection circuit C2 of the secondary side charging pressure monitoring switch PS3 is disconnected, the fire detection signal Since the fire extinguishing activity is enabled when S1 is detected, a highly safe pre-acting fire extinguishing facility can be realized.

  Even if the connection circuit C1 of the fire detector 20 is disconnected and the connection circuit C2 of the secondary side charging pressure monitoring switch PS3 is disconnected at the same time, these are detected by the main valve opening means and pre-actuated. Since the main valve 10 of the flowing water detection device 6 'is opened, a highly safe pre-acting fire extinguishing equipment that enables a fire extinguishing action in the event of a fire in such an emergency is realized. .

  Further, in the main valve open state of the valve body 6, fire extinguishing water is not discharged as long as the closed sprinkler head 3 maintains the closed state, so that occurrence of water damage can also be suppressed.

Further, when the closed sprinkler head 3 is opened due to a fire in the main valve open state of the valve body 6, fire extinguishing activities can be quickly performed based on the driving operation of the fire pump of the fire pump driving means. .
In the present embodiment, the so-called wet pre-acting fire extinguishing equipment has been described. However, the present invention fills the primary-side piping of the pre-acting running water detection device with fire extinguishing water, and the secondary side of the running water detection device. The present invention can also be applied to a dry-type pre-acting fire extinguishing facility in which piping is filled with air.

  Since the pre-operated fire extinguishing equipment according to the present invention is extremely safe, it can be widely applied to buildings requiring fire extinguishing equipment such as commercial buildings, apartments, public facilities such as stations, and the like.

1 Pre-acting fire extinguishing equipment 2 Primary piping (primary piping)
3 Closed sprinkler head 4 Sprinkler piping (secondary piping)
5 Secondary piping (secondary piping)
6 Valve body 6 'Pre-acting running water detector 10 Main valve 20 Fire detector 23b Disconnection detection circuit (first disconnection detection circuit)
24 Pre-operation control unit 24a OR circuit 24b OR circuit 24c AND circuit 25b Disconnection detection circuit (second disconnection detection circuit)
L1, L2 connecting line PS3 Pressure monitoring switch for secondary side charging (secondary pressure reducing monitoring switch)
PS4 Primary pressure reduction monitoring switch S1 Fire detection signal S2 Disconnection detection signal (first disconnection detection signal)
S3 Decompression detection signal S4 Disconnection detection signal (second disconnection detection signal)
S7 Drive signal (Main valve open signal)
T pressure tank

Claims (5)

The primary side pipe is connected to the pre-actuated running water detector with the main valve closed, and the secondary side pipe with a closed sprinkler head is connected to the detector to detect the secondary pressure reduction. A secondary side pressure reduction monitoring switch is provided, and a fire detection signal based on a fire detection of a fire detector and a pressure reduction detection signal of the secondary side pressure reduction monitoring switch by opening the sprinkler head In the pre-acting fire extinguishing equipment having a pre-acting control unit that opens the main valve,
A first disconnection detection circuit for detecting a disconnection of the connection line of the fire detector and generating a first disconnection detection signal; and a second disconnection detection signal for detecting a disconnection of the connection line of the secondary-side decompression monitoring switch. A second disconnection detection circuit for generating
When the decompression detection signal is detected in the state of detecting the first disconnection detection signal, or when the fire detection signal is detected in the state of detecting the second disconnection detection signal, A pre-acting fire extinguishing system, comprising a main valve opening means for generating a main valve opening signal for opening the main valve of the pre-operating water flow detection device.   When the main valve opening means detects both the first disconnection detection signal and the second disconnection detection signal, the main valve opening means outputs the main valve opening signal for opening the main valve of the pre-actuated water flow detection device. The pre-acting fire extinguishing equipment according to claim 1, wherein the fire extinguishing equipment is generated. The primary side pipe is connected to the pre-actuated running water detector with the main valve closed, and the secondary side pipe with a closed sprinkler head is connected to the detector to detect the secondary pressure reduction. A secondary side pressure reduction monitoring switch is provided, and a fire detection signal based on a fire detection of a fire detector and a pressure reduction detection signal of the secondary side pressure reduction monitoring switch by opening the sprinkler head In the pre-acting fire extinguishing equipment having a pre-acting control unit that opens the main valve,
A first disconnection detection circuit for detecting a disconnection of the connection line of the fire detector and generating a first disconnection detection signal; and a second disconnection detection signal for detecting a disconnection of the connection line of the secondary-side decompression monitoring switch. A second disconnection detection circuit for generating
Provided is a main valve opening means for generating a main valve opening signal for opening the main valve of the pre-actuated running water detection device when both the first disconnection detection signal and the second disconnection detection signal are detected. Pre-acting fire extinguishing equipment characterized by The primary side pipe is connected to the pre-actuated running water detector with the main valve closed, and the secondary side pipe with a closed sprinkler head is connected to the detector to detect the secondary pressure reduction. A secondary side pressure reduction monitoring switch is provided, and a fire detection signal based on a fire detection of a fire detector and a pressure reduction detection signal of the secondary side pressure reduction monitoring switch by opening the sprinkler head In the pre-acting fire extinguishing equipment having a pre-acting control unit that opens the main valve,
A disconnection detection circuit (25b) for detecting disconnection of the connection line of the secondary side decompression monitoring switch and generating a disconnection detection signal (S4);
In the state where the disconnection detection signal (S4) is detected, when the fire detection signal is detected, a main valve opening signal for generating a main valve opening signal for opening the main valve of the pre-actuated water flow detection device is generated. Pre-acting fire extinguishing equipment, characterized in that means are provided.   In the state where the main valve of the pre-actuated flow detection device is open, the fire extinguishing pump is driven to extinguish the primary side pipe based on the pressure drop of the primary side pipe based on the opening of the closed sprinkler head. The pre-operation type fire extinguishing equipment according to any one of claims 1 to 4, further comprising a fire extinguishing pump driving means for supplying water under pressure.

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