JPH06178826A - Pre-operation type sprinkler extinguishing equipment - Google Patents

Abstract

(57) [Summary] [Purpose] With regard to pre-operated sprinkler fire extinguishing equipment, the purpose is to eliminate the complexity of the manual operation of restoring the fire detector during non-fire alarms. [Structure] The fire detector is self-holding type, and when the fire signal is received from the self-holding type fire detector and it is judged as a fire, the fire detector is restored when the pressure drop signal is not received within the predetermined time The control means for controlling to do so is provided.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a pre-actuated sprinkler fire extinguishing system.

[0002]

2. Description of the Related Art As a conventional pre-operation type sprinkler fire extinguishing equipment, there are the following, for example. In other words, in this pre-operation type sprinkler fire extinguishing equipment, a compressor is provided to pressurize the secondary side of the pre-operation type water flow detection device with pressurized air, and a more sensitive fire detection than the closed type sprinkler head. A fire detector is placed on the ceiling of the protected area to detect a fire with this fire detector, the pre-operated flow detector is opened, and the pressurized water supply device is started.

During steady-state monitoring, the pressurized water is filled up to the primary side of the pre-operation type water flow detection device provided at the branch from the main pipe for each protected area. Pressurized air from the compressor is filled in the pipe from the secondary side to the closed type sprinkler head. On the other hand, the decompression alarm device is monitoring the pressurization state, and the fire detector in the target area is on alert.

When a fire occurs, the fire detector outputs a fire signal, and the pressure reduction alarm device outputs a pressure drop signal to activate the fire receiver and the pre-operation valve control panel. In addition to issuing an alarm and display, start a pressurized water supply device such as a fire pump. In addition, the pre-operation valve control panel opens the pre-operation type water flow detection device in the corresponding area, and rapidly opens the pipe to the closed type sprinkler head in the stage before reaching the operation range due to the temperature rise near the fire source. When the head is filled with water and the heat is released from the head, pressurized air is released first, and then water is released to start fire fighting.

As a pre-operation type running water detecting device used in this pre-operation type sprinkler fire extinguishing equipment, there are, for example, those shown in FIGS. 9 and 10. FIG. 9 shows a pre-operation type running water detection device in a steady monitoring state, in which the primary pipe 1 is filled with pressurized water for extinguishing, the priming chamber 2 is also filled with pressurized water on the primary side, and before and after the clapper 3 which is a valve body. Since pressurized water of the same pressure is applied to the clapper 3, the clapper 3 is kept in a closed state due to the difference in area between the clapper 3 before and after (primary side 1: priming chamber side 2).

Secondary chamber 2 defined by clapper 3
A curved secondary pipe 4 is connected to A, and a check valve 5 is connected to the secondary pipe 4. A branch pipe 6 to which a sprinkler head is connected is connected to the check valve 5. The check valve 5 is kept closed because the secondary side of the clapper 5A of the check valve 5 and the branch pipe 6 are filled with compressed air, while the inside of the secondary pipe 4 is at atmospheric pressure. Be drunk

The priming chamber 11 provided with a relief valve 7, a pressure gauge 8, a manual opening valve 9 and a motor-operated valve 10 is connected to the priming chamber 2, and the motor-operated valve 10 is closed in a steady monitoring state. The priming chamber 2 holds pressurized water. Relief valve 7
Is connected to the secondary side chamber 2A by a relief pipe 12. Further, the priming chamber 2 has an orifice 13, a two-way check valve 1
4 and the priming pipe 16 provided with the priming valve 15 are connected, and the priming pipe 16 is connected to the primary pipe 1 on the front side of the primary side control valve 17. At the time of restoration, the normally closed priming valve 15 is opened in the priming chamber 2 to supply the pressurized water of the primary pipe 1.
At the time of monitoring, pressurized water is supplied to the priming chamber 2 from the primary side pressurized water introducing pipe 18 connected to the primary side pipe 1 behind the primary side control valve 17 via the two-way check valve 14 and the orifice 13.

In the secondary side chamber 2A, the running water alarm pipe 1 is provided.
9 is connected, and the pressure switch 20 is connected to the running water alarm pipe 19.
Is provided. The pressure switch 20 is a secondary chamber 2A,
The rise in pressure in the secondary pipe 4 is detected. The pressure switch 20 has a water flow detection function. Ie clapper 3
Is opened, pressurized water flows into the secondary side chamber 2A and the secondary pipe 4 to increase the pressure, and the pressure switch 20 produces a detection output.

The primary side pressurized water introducing pipe 18 is provided with a primary side drain valve 21 and a pressure gauge 22, and a pressure switch 20 is connected to the flowing water alarm pipe 19.
An alarm test valve 23 for performing the above test is provided. In addition to the running water alarm pipe 19, an auto drip 2
4 is connected to the drainage pipe 25, and the drainage pipe 25 is provided with an auxiliary drainage valve 26.

On the other hand, the check valve 5 is connected to an air supply pipe 27 for supplying compressed air from a compressor, and the air supply pipe 27 is provided with a pressure gauge 28, a pressure switch 29 and an air supply valve 30. An air bypass valve 32 and an orifice check nipple 33 are provided in a bypass pipe 31 of the air supply valve 30. A system drain valve 35 is provided in the drain pipe 34 connected to the check valve 5.

The pressure switch 29 operates as a pressure reducing switch for detecting the pressure reduction of the pressurized air filled in the branch pipe 6, for example, the operation of the sprinkler head and the leakage of the compressed air due to the damage of the pipe. FIG. 10 is a diagram showing an operating state of the pre-operation type water flow detection device. The opening operation of the pre-operation type water flow detection device is performed by opening the motor-operated valve 10 based on the operation signal of the fire detector.

When the motor-operated valve 10 is opened, the pressurized water in the priming chamber 2 is
From the flow rate of the pressurized water that enters through the orifice 13,
Since the flow rate discharged to the start-up pipe 11 is higher, the pressure is discharged to the drain side and the pressure drops, and the clapper 3 is pushed by the pressurized water of the primary pipe 1 and opened as shown in FIG. Pressurized water is supplied to the next pipe 4. At this time, the pressure of the air filled in the check valve 5 and the branch pipe 6 is lower than the pressure of the pressurized water in the primary pipe 1, so that the clapper 5A is also opened and the pressurized water is supplied to the sprinkler head.

In the opening operation of the clapper 3 as described above, the pressure switch 20 detects that the supply of the pressurized water from the secondary side chamber 2A has reached a predetermined pressure, and issues a running water alarm. Next, in order to restore the pre-operation type water flow detection device, the primary side control valve 17 is closed, and in this closed state, the system drain valve 35, the auxiliary drain valve 26, and the primary drain valve 2
Open one.

Then, a pre-operation valve control panel (not shown) is reset, and the priming valve 15 is opened with the electric valve 10 closed,
The pressurized water on the front side of the primary side control valve 17 is introduced into the priming chamber 2. After confirming that the pressure indicated by the pressure gauge 8 rises, drainage from the auxiliary drainage valve 26 disappears, and the clapper 3 is closed, the primary side control valve 17 is partially opened, and the primary side drainage valve is slowly opened. 21 is closed and the auxiliary drain valve 26 is closed. Further, after the drainage in the branch pipe 6 is completed, the system drainage valve 35 is closed.

Then, the primary side control valve 17 is completely opened,
The exhalation valve 15 is closed. In this way, the clapper 3 closes the opening of the primary pipe 1 due to the front-back area difference. In the conventional pre-actuated sprinkler fire extinguishing equipment equipped with such a pre-actuated running water detector, in order to avoid opening the pre-actuated running water detector due to the non-fire alarm of the fire detector, Instead of opening the pre-running water flow detection device only with a fire signal, the branch pipe from the pre-running water flow detection device to the sprinkler head is filled with pressurized air, and the pressure drop due to the operation of the sprinkler head in the branch pipe is detected. Then, the pre-operation type running water detection device is opened by both the fire signal and the pressure drop signal.

In this case, if the fire detector is a self-holding type fire detector, for example, a smoke detector, the smoke detector turns on the output circuit once the fire is judged, and outputs the fire signal to the pre-operation valve control panel. Continue to be sent to. Even if the smoke detector was turned on, the sprinkler head did not work, and when there was no fire, the smoke detector was restored by manually operating the restoration switch provided on the pre-operation valve control panel.

[0017]

However, in such a conventional pre-actuated sprinkler fire extinguishing system, the pre-actuated valve control panel for controlling the pre-actuated running water detection device does not operate the pipe shaft or the like. Since it was installed in a remote place, there was a problem that the operation to restore the smoke detector that was erroneously issued was complicated.

The present invention has been made in view of the above-mentioned conventional problems, and pressure is applied within a predetermined time after a fire signal is received from a self-holding type fire detector and it is determined that a fire has occurred. Providing a pre-activated sprinkler fire extinguishing facility that does not complicate the manual operation of restoring the fire detector when a non-fire alarm occurs by providing a control means that automatically restores the fire detector when no drop signal is received The purpose is to do.

[0019]

In order to achieve the above object, the present invention, as shown in FIG. 1, fills pressurized water up to a pre-operation valve and adds a branch pipe from the pre-operation valve to the sprinkler head. A pre-operation valve which is filled with pressurized air and which opens the pre-operation valve in response to a fire signal from a fire detector and a pressure drop signal from a pressure detection means for detecting a pressure drop due to the operation of the sprinkler head in the branch pipe. In the actuation type sprinkler fire extinguishing equipment, the fire detector is of a self-holding type, and the pressure drop signal is not received within a predetermined time after a fire signal is received from the self-holding type fire sensor and the fire is judged. In this case, a control means for controlling the fire detector to be restored is provided.

Further, according to the present invention, the control means once controls the recovery of the fire detector when the first fire signal is received from the fire detector, and once the fire is recovered, a fire is generated within a predetermined time. The feature is that it is judged as a fire when the second fire signal is received from the detector.

[0021]

According to the pre-actuated sprinkler fire extinguishing equipment having such a structure, the fire detector is of the self-holding type,
After the fire signal is received from the fire detector and it is judged as a fire, or when the first fire signal from the fire detector is received, the fire detector is restored once, and after a predetermined time after restoration If a pressure drop signal is not received within a predetermined time after receiving the second fire signal from the fire detector and judging that it is a fire, it is judged as non-fire and the fire detector is restored. Since this is done, the trouble of manual restoration is eliminated, and the troublesome restoration operation in the pipe shaft can be saved.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 8 are views showing an embodiment of the present invention.
FIG. 3 is an overall view showing a pre-operation type sprinkler fire extinguishing equipment. In FIG. 3, reference numeral 51 is a fire extinguishing pump, and the fire extinguishing pump 51 pressurizes the fire extinguishing water from the water source water tank 52 and supplies it to a water supply main 54 that is vertically raised in the building through a sluice valve 53. The fire pump 51 is started and stopped by the fire pump control panel 55.

The tip of the main water supply pipe 54 is connected to an auxiliary elevated water tank 56 installed on the roof or the like. In addition, the water supply main 54
Is connected to another water supply pipe 58 having a connection water supply port 57 for connecting a pressurized water hose such as a fire pump car, and from the middle of the water supply main pipe 54, a primary pipe 59 which is a branch pipe branches for each floor. The primary pipe 59 is connected to the pre-operation type running water detection device 60.

A pressure tank 61 is branched and connected to the secondary side of the sluice valve 53 of the main water supply pipe 54 so that the internal pressure of the main water supply pipe 54 is constantly maintained at a constant pressure. In addition, a water tank 63 is provided at a predetermined height near the fire pump 51.
Is installed, and the priming water supply pipe 64 is connected to the discharge side of the fire pump 51 from the priming tank 63. This water tank 63 is provided with a water level sensor 65, and the water level sensor 65 has an upper limit electrode 66, a lower limit electrode 67, and a common electrode 68.

The output of the water level sensor 65 is the pump control panel 5
5, the pump control panel 55 issues a full water alarm (upper limit alarm) and a water decrease alarm (lower limit alarm). Further, a test pipe 69 for flowing a rated flow rate in the pump performance test is branched and connected to the discharge side of the fire extinguishing pump 51, and the end of the test pipe 69 is inserted into the water source water tank 52.

A compressor 70 is provided in the vicinity of the pump control panel 55, and compressed air from the compressor 70 is a pre-operation valve that is a pre-operation valve via an air pipe 71, an air filter 72, an air dryer 73, and a regulator 74. It is supplied to the operation type running water detection device 60. A branch pipe 80 is connected to the pre-operation type running water detection device 60, and a plurality of sprinkler heads 81 are connected to the branch pipe 80.
In the steady monitoring state, compressed air is enclosed in the branch pipe 80. When the pre-operation type running water detection device 60 operates, the pressurized water from the fire extinguishing pump 51 is supplied into the branch pipe 80.

An end testing device 82 is provided at the end of the branch pipe 80. The terminal test device 82 has a pressure gauge 83, a test valve 84, and an orifice 85 for flowing a flow rate corresponding to the operation of one sprinkler head 81. A plurality of fire detectors 86 are provided in the vicinity of the sprinkler head 81, and their fire signals are output to the pre-operation valve control panel 87.

As the fire detector 86, a self-holding type fire detector 86, for example, a smoke detector is used. Smoke detector
The light emitting element and the light receiving element are arranged in the smoke detection area in the sensor so that the light from the light emitting element does not directly enter the light receiving element. The signal is converted into a signal, and when the received light level exceeds a preset threshold value, the output circuit is turned on and a fire signal is output. The use of this smoke detector is effective for initial fire extinguishing in the case of a real fire.

The pre-operation valve control board 87 activates the pre-operation type water flow detection device 60 in response to a fire signal from the fire detector 86, and manually stops the operation. Further, the pre-operation valve control panel 87 transfers the fire signal from the fire detector 86 to the self-fire alarm receiver 88, and the running water warning signal or the compressed air pressure from the pre-operation type running water detection device 60 is lowered. When the pressure drop signal indicating that is received, these are transferred to the self-fire alarm receiver 88. The self-fire alarm receiver 88 displays a fire, a pre-operation valve opening / closing display, a pump operation display, and the like.

Next, the pre-operation type running water detection device will be described with reference to FIGS. 1 and 2. FIG. 1 shows a pre-operation type running water detection device in a steady monitoring state, and FIG. 2 shows a pre-operation type running water detection device in an operating state. In FIG. 1, reference numeral 91 denotes a main body of a pre-operation type running water detection device 60, into which a primary pipe 59 arranged in a horizontal direction is inserted, and an end portion thereof is open. The inside of the main body 91 is divided into a priming chamber 93 and a secondary chamber 94 by a clapper 92 which is a valve body.
The clapper 92 opens and closes the opening of the primary pipe 59. The spring 95, which is an elastic body, is housed in the priming chamber 93,
The spring 95 presses the clapper 92 toward the opening side. The primary pipe 59 is filled with pressurized water for extinguishing the fire, and the priming chamber 93 is also filled with pressurized water of the same pressure.
The clapper 92 is held in the closed state by the area difference before and after (primary side 1: priming chamber side 2) and the force of the spring 95.

A check valve 96 is connected in the vertical direction of the main body 91, and the check valve 96 is provided with a clapper 97. A branch pipe 80 to which the sprinkler head 81 is connected is connected to the check valve 96, and a sluice valve 98 is provided at a connecting portion between the check valve 96 and the branch pipe 80. An air pipe 71 for supplying compressed air is connected to an upper side of the check valve 96 above the clapper 97, the secondary side of the clapper 97 and the branch pipe 80 are filled with the compressed air, and the secondary side chamber of the main body 91 is connected. 94
Is atmospheric pressure, the clapper 97 is kept closed.

The air pipe 71 is provided with a control valve 75, a flow rate adjusting valve 76 with an orifice mechanism, and a check valve 77.
Normally, the flow rate adjusting valve 76 is closed, but the valve body has φ2.
A hole with a small diameter is opened, and compressed air is supplied from the hole. At the time of restoration, the compressed air is quickly supplied into the pipe by opening the flow rate adjusting valve 76. 99
Is a drainage pipe connected to the check valve 96.
9 is provided with a pressure gauge 100, a pressure switch 101, and a system drain valve 102.

The pressure switch 101 serving as a pressure detecting device reduces the pressure of the compressed air filled in the secondary side of the check valve 96 and the branch pipe 80, for example, the leakage of the compressed air due to the operation of the sprinkler head 81 or the breakage of the pipe. It is detected and a pressure drop signal is sent to the pre-operation valve control panel 87. System drain valve 10
When a parent-child valve is used as 2, the running water test can be performed without flowing pressurized water to the sprinkler head 81. That is, the sluice valve 98 is closed, the fire detector 86 is activated, the pre-operation type water flow detection device 60 is activated, the fire extinguishing pump 51 is activated, and the flow rate of one sprinkler head 81 is flowed to test the flowing water. I do.

Reference numeral 103 is a priming pipe, and the priming pipe 103
Is connected to the priming chamber 93 and the other end is connected to the primary pipe 59. The pressurized water in the primary pipe 59 is supplied to the priming chamber 93 via the priming valve 104, the strainer 105, the check valve 106, the orifice 107, and the pressure gauge 108 which are normally open. A starting pipe 109 is connected to the priming pipe 103 on the side of the priming chamber 93, and an electric valve (starting valve) for opening and closing the starting pipe 109 by an opening / closing signal from the pre-operation valve control panel 87.
Connected to the drainage pipe via 110. In addition, a manual opening valve 11 is provided in the starting pipe 109 in parallel with the motor-operated valve 110.
1 is provided.

The opening of the orifice 107 is determined by the priming pipe 10
3 is set so that the drainage amount of the starting pipe 109 when the electric valve 110 is opened is larger than the inflow amount from 3 to the priming chamber 93. Therefore, when the motor-operated valve 110 is opened, the pressure in the priming chamber 93 decreases, and the clapper 92 immediately opens when the pressure of the pressurized water in the primary pipe 59 exceeds the force of the spring 95 (see FIG. 2).

When the motor-operated valve 110 is closed, the pressurized water from the priming valve 104 and the orifice 107 is supplied to the priming chamber 93.
The pressure is gradually accumulated in the primary pipe 59 to become the same as the pressurized water in the primary pipe 59.
The force of 5 causes the clapper 92 to slowly close the opening of the primary pipe 59. The check valve 106 sets only the flow of the pressurized water to the priming chamber 93 and prevents the backflow. The pressure gauge 108 measures the pressure of the pressurized water flowing through the priming water pipe 103.

Reference numeral 112 is a flowing water alarm pipe, one end of which is connected to the secondary side chamber 94 of the main body 91.
The other end is connected to the drainage pipe. Auxiliary drain valve 113, strainer 114, check valve 115,
A pressure switch 116 and an orifice 117 are provided. When the clapper 92 is opened, the pressure switch 116 detects that the pressure of the pressurized water flowing into the flowing water alarm pipe 112 has reached a predetermined pressure. That is, the pressure switch 116 has a water flow detection function and outputs a water flow alarm signal to the pre-operation valve control panel 87. The orifice 117 is capable of providing a sufficient flow rate for the pressure switch 116 to be instantly turned on when the clapper 92 is open and to have sufficient drainage to be instantly turned off when the clapper 92 is closed. Is set to a different opening.

An alarm test valve 119 is provided in the test pipe 118 connecting the running water alarm pipe 112 and the priming pipe 103, and by opening the alarm test valve 119,
The pressure switch 116 is tested. Next, FIG. 4 is a block diagram showing the control and monitoring system shown in FIGS.

In FIG. 4, the pre-operation valve control panel 87 is operated by the self-holding fire detector 86 based on both the fire signal from the fire detector 86 and the pressure drop signal from the pressure switch 101.
An open signal is output to 10. in this case,
When a pressure drop signal is received within a predetermined time after a fire signal is received from the fire detector 86 and a fire is determined, an open signal is output to the motor-operated valve 110, but the pressure drop signal is received within the predetermined time. When there is no fire, it is determined that there is no fire, and the power to the fire detector 86 is shut off and automatically restored.

That is, the control section 140 as the control means.
Operates the timer 141 for a predetermined time, for example, 15 minutes after receiving a fire signal from the fire detector 86 and determining that a fire has occurred. If the pressure drop signal is not received within the predetermined time, the fire detector 86 is connected. The fire sensor 86 is restored by temporarily shutting off the power supply to the power / signal line 142 being operated.

The control unit 140 receives the first fire signal from the fire detector 86 and determines that it is a fire. However, the present invention is not limited to this, and the storage circuit 121 causes the first fire signal from the fire detector 86. The fire detector 86 may be once controlled to recover when it is received, and may be judged to be a fire when the second fire signal from the fire detector 86 is received within a predetermined time after the recovery. .

When the timer 141 is operated based on this fire judgment and no pressure drop signal is received within a predetermined time, it is judged that there is no fire, the motor-operated valve 110 is not opened, and the fire detector 86 is automatically operated. Restore. The fire signal from the fire detector 86, the pressure drop signal from the pressure switch 101, and the running water alarm signal from the pressure switch 116 are transferred from the pre-operation valve control panel 87 to the self-fire alarm receiver 88 to receive the self-fire alarm. Machine 88.

Further, the pressure reduction of the primary pipe 59 and the main water supply pipe 54 is detected by the pressure switch 62, the fire pump 51 is started by the pump control panel 55, and the operation of the fire pump 51 is displayed on the fire alarm receiver 88. It Next, FIG. 5 is a diagram showing a pre-operation valve control panel. In FIG. 5, reference numeral 123 is an indicator light for indicating the pre-operation valve opening by the running water alarm signal from the pressure switch 116, 124 is an indicator light for indicating the fire by the fire signal from the fire detector 86, and 125 is the pressure switch 101. It is an indicator light that indicates a decrease in air pressure due to a pressure decrease signal.

Reference numeral 139 is an audio device (buzzer). When the audio device 139 is stopped, the audio switch 132 is tilted to the stop side. At this time, the indicator lamp 128 for displaying the switch caution blinks. Further, when performing the standby power supply test, the standby power supply switch 133 is tilted to the test side. If the indicator lamp 126 for indicating the AC power supply and the standby power supply test is red, the capacity of the standby power supply is normal.

Reference numeral 127 indicates an indicator light indicating that the standby power source is not connected, 129 indicates an electric valve closing confirmation indicator, 130 indicates that the accumulating circuit 121 is accumulating,
Reference numeral 131 is an indicator lamp for displaying a disconnection of the control line or the power / signal line 142. Also, 134 is a self-fired alarm receiver 88.
Is a transfer stop switch for stopping the transfer of the signal to (1), and 135 is a pre-operation valve interlocking stop switch.

When the fire detector 86 does not operate and the pre-operation type running water detection device 60 is manually opened, the manual release push button 136 is pushed. When the manual opening push button 136 is operated, the built-in LED lights up, and when the opening is completed, the pre-operation valve opening indicator light 123 lights up. When closing the pre-operation type running water detection device 60, the manual closing push button 137 is pushed until the indicator light 129 for confirming the motor-operated valve closing lights up. in this case,
For safety after that, the pre-operation valve interlocking stop switch 13
Set 5 to the stop side.

When the pre-operation type water flow detector 60 is closed,
The pre-operation valve interlocking stop switch 125 is returned to interlocking. In addition,
138 is a fire recovery push button. Next, FIG. 6 is a flow chart showing an operation procedure at the time of a recovery operation of the fire detector.
In FIG. 6, first, when a fire signal is received from the self-holding type fire detector 86 in step S1 and it is determined that there is a fire, the timer 141 is activated in step S2. Also,
When using the storage circuit 121 to judge a fire, the fire detector 86 is once restored when the first fire signal is received from the fire detector 86, and once restored, the fire detector 86 is restored within a predetermined time. When the second fire signal is received from, it is determined that there is a fire, and the timer 141 is activated.

Next, in step S3, when the timer 141 is activated and the pressure drop signal is not received within a predetermined time (for example, 15 minutes) and the time-out occurs, the control section 140 controls the power source / signal line in step S4. The power supply to 142 is once cut off and the fire detector 86 is restored. In this way, the self-holding type fire detector 8 is prone to generate non-fire alarms.
6. Even if, for example, a smoke detector is used, if the sprinkler head 81 does not operate within a predetermined time, the fire detector 86 is automatically restored without opening the pre-running flow detector 60. Pre-control type control panel 8 provided in a place where it is difficult to operate in the pipe shaft, such as
There is no need to manually operate the recovery switch provided in 7.

Next, FIG. 7 is a flow chart showing the operation procedure when a fire occurs. In FIG. 7, step S
A fire broke out at 11 and the fire detector 86 at step S12.
Is activated and outputs a fire signal. The fire signal is received by the pre-operation control panel 87, and when the control unit 140 determines that there is a fire, the timer 141 is activated. When the sprinkler head 81 is activated in step S13 and the control unit 140 receives the pressure decrease signal from the pressure switch 101 within a predetermined time in step S14, an open signal is sent to the motor-operated valve 110. Accordingly, when the motor-operated valve 110 is opened in step S15, the pre-operation type running water detection device 60 is operated in step S16.
Is opened. That is, the pressurized water in the priming chamber 93 is drained from the starting pipe 109 via the motor-operated valve 110, the pressure in the priming chamber 93 decreases, and the opening force of the pressurized water in the primary pipe 59 overcomes the force of the spring 95. Then, the clapper 92 opens.

At this time, the priming valve 104, the check valve 106,
Pressurized water flows into the priming chamber 93 through the orifice 107, but the amount of inflow is limited by the orifice 107,
Since the discharge amount of the starting pipe 109 due to the opening operation of the electric valve 110 is larger than the inflow amount, the clapper 92 maintains the open state. When the clapper 92 separates from the opening of the primary pipe 59 and becomes in the open state, it communicates with the primary pipe 59 and the secondary side chamber 94 of the main body 91, and in step S17, the running water alarm pipe 1
Pressurized water flows into 12, and the pressure switch 116 is activated in step S18 to detect running water and output a running water alarm signal to the pre-operation valve control panel 87.

On the other hand, since the pressurized water on the primary side of the pre-operation type running water detection device 60 flows out to the secondary side, decompression of the primary pipe 59 and the water supply main pipe 54 occurs in step S19, and step S19.
The pressure switch 62 is actuated by this pressure reduction at 20, and the fire pump 51 is operated at step S21.
Water is continuously discharged at 2. Next, FIG. 8 is a flowchart showing an operation procedure at the time of the manual closing operation.

In FIG. 8, when the fire is extinguished in step S31, the manual closing push button 137 is pressed in step S32 until the indicator light 129 for confirming the electric valve closing lights up. In this way, when the closing signal is output to the electric valve 110, the electric valve 110 closes the starting pipe 109 in step S33. Piping for starting 1
09 is closed, drainage from the priming chamber 93 is not performed,
When pressurized water is introduced into the priming chamber 93 from the priming pipe 103 through the priming valve 104, the check valve 106, and the orifice 107, and the water pressure of the primary pipe 59 and the water pressure of the priming chamber 93 become equal, the step In step S34, the clapper 92 slowly closes the opening of the primary pipe 59 due to the front-back area difference and the force of the spring 95.

When the clapper 92 is closed, the primary pipe 5
Since the flow of the pressurized water from 9 to the secondary side chamber 94 is stopped,
The pressure in the water flow warning pipe 112 decreases, and step S35
Then, the pressure switch 116 is turned off, and the output of the running water alarm signal is stopped in step S36. Meanwhile, Clapper 9
When the valve 2 is closed, the pressure in the primary pipe 59 and the main water supply pipe 54 is not reduced, and the pressure switch 62 is restored in step S37. By operating the recovery button provided on the pump control panel 55 in step S38, the fire pump 51 stops operating.

In this embodiment, the sprinkler head 81 must operate even if a self-holding type fire detector 86, especially a smoke detector, is used because an initial fire is easily detected and a non-fire alarm is likely to occur. For example, pre-operation type water flow detector 6
0 does not open, and sprinkler head 81
If is not activated, the fire detector 86 is automatically restored by the control unit 140, so there is no need to manually restore the fire detector 86, and it is possible to save time and trouble.

When the self-holding type fire detector 86 is used, it is effective for initial fire extinguishing in the case of an actual fire.

[0056]

As described above, according to the present invention, a self-holding type fire detector is used and a pressure drop signal is received within a predetermined time after a fire signal is received and the fire is judged. When it is not, the fire detector is automatically restored, so that the complexity of the manual restoration operation can be eliminated.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a valve open state.

[Figure 3] Overall view of the sprinkler fire extinguishing equipment

FIG. 4 is a block diagram showing a control and monitoring system.

FIG. 5 is a diagram showing a pre-operation valve control panel.

FIG. 6 is a flowchart showing an operation procedure at the time of recovery operation.

FIG. 7 is a flow chart showing an operation procedure when a fire occurs.

FIG. 8 is a flowchart showing an operation procedure at the time of manual closing operation.

FIG. 9 is a diagram showing a conventional steady monitoring state.

FIG. 10 is a view showing a conventional operating state.

[Explanation of symbols]

 51: Fire extinguishing pump 52: Water source water tank 53: Gate valve 54: Water supply main 55: Pump control panel 56: Auxiliary elevated water tank 57: Connected water supply port 58: Water supply pipe 59: Primary pipe 60: Pre-operation flow water detector (pre-operation) Operation valve) 61: Pressure tank 62: Pressure switch 63: Water tank 64: Water supply pipe 65: Water level sensor 66: Upper limit electrode 67: Lower limit electrode 68: Common electrode 69: Test pipe 70: Compressor 71: Air pipe 72: Air filter 73: Air dryer 74: Regulator 75: Control valve 76: Flow control valve 77: Check valve 80: Branch pipe 81: Sprinkler head 82: Terminal test device 83: Pressure gauge 84: Drain valve 85: Orifice 86: Fire detection Unit 87: Pre-operation valve control panel 88: Self-fired alarm receiver 91: Main body 92: Clapper 93: Water chamber 94: Secondary side chamber 9 5: Spring 96: Check valve 97: Clapper 98: Gate valve 99: Drainage pipe 100: Pressure gauge 101: Pressure switch 102: System drainage valve 103: Irrigation pipe 104: Inflation valve 105: Strainer 106: Check valve 107: Orifice 108: Pressure gauge 109: Piping for starting 110: Electric valve 111: Manual opening valve 112: Flow alarm pipe 113: Auxiliary drain valve 114: Strainer 115: Check valve 116: Pressure switch 117: Orifice 118: Test pipe 119: Alarm test valve 121: Storage circuit 123 to 131: Indicator light 132: Acoustic stop switch 133: Standby power supply test switch 134: Transfer stop switch 135: Pre-operation valve interlock stop switch 136: Manual open push button 137: Manual close push button 138: Fire recovery push button 139: Acoustic device 1 0: Control unit (control means) 141: timer 142: power combined signal line

Claims (2)

[Claims] 1. A pre-operation valve is filled with pressurized water, a branch pipe from the pre-operation valve to the sprinkler head is filled with pressurized air, and a fire signal from a fire detector and actuation of the sprinkler head in the branch pipe are provided. In a pre-actuated sprinkler fire extinguishing system in which the pre-operation valve is opened in response to a pressure drop signal from a pressure detection means for detecting a pressure drop, the fire detector is of a self-holding type, and the self-holding type fire A control means is provided for controlling so as to restore the fire detector when the pressure drop signal is not received within a predetermined time after the fire signal is received from the detector and the fire is judged. Actuated sprinkler fire extinguishing equipment. 2. The control means includes a first detector from the fire detector.
When the fire signal of the report is received, the fire detector is once restored and controlled, and when the fire signal of the second report is received from the fire detector within a predetermined time after restoration, it is judged as a fire. The pre-actuated sprinkler fire extinguishing equipment according to claim 1, wherein