JPH1199222A - Sprinkler fire extinguishing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely perform the operation, and reduce a water loss even when a closed type sprinkler head is damaged by a method wherein after filling pressurized water for fire extinguishing in a secondary side piping, the pressure of the water for fire extinguishing is adjusted to a pressureless state by a water draining valve. SOLUTION: An opening/closing valve 3 is opened by operating a manual starting valve 7, and when pressurized water for fire extinguishing in a primary side piping 4 is made to flow into a secondary side piping 8, a controller 20 drives a water feeding pump 2 by a running water signal from a running water detecting device 12. When the pressure of the water for fire extinguishing which fills the secondary side piping 8 and a branch pipe 16 becomes the same pressure in the primary side self-pipe 4, the running water signal stops, and the controller 20 stops the water feeding pump 2. Under this state, the opening/closing valve 3 is closed by operating the manual starting valve 7. Then, a second water draining valve 18 is manually opened, and the water for fire extinguishing in the branch pipe 16 and the secondary side piping 8 is drained while watching a pressure gauge 15, and when the pressure of the water for fire extinguishing in the secondary side piping 8 has decreased to about the atmospheric pressure, the second water draining valve 18 is closed. At this time, an automatic water draining valve 17 is automatically opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sprinkler fire extinguishing system in which a secondary pipe of an on-off valve is filled with fire extinguishing water having a pressure substantially equal to the atmospheric pressure.

[0002]

2. Description of the Related Art In a conventional dry-type pre-actuated sprinkler fire extinguishing system, a primary side pipe of an on-off valve is connected to a pressurized water supply facility, and a closed type sprinkler head is mounted on a tip side of a secondary side pipe. In addition, fire alarms are installed in guard areas equipped with closed sprinkler heads. A pressurizing device such as a compressor for pressurizing the inside of the secondary pipe with compressed air to maintain a high pressure, an alarm device for detecting a pressure reduction in the secondary pipe and issuing an alarm are provided.

In the above-described sprinkler fire extinguishing system, when the closed type sprinkler head is opened due to a fire, the closed type sprinkler head releases compressed air in the secondary pipe, and the fire detector activates the open / close valve. Fire water is sent to the secondary side piping, and water is discharged from the closed sprinkler head to extinguish the fire.

[0004]

In the conventional sprinkler fire extinguishing system as described above, since the opening valve is closed even if only the closed type sprinkler head operates, the fire extinguishing water is only discharged from the compressed air. No water is released. For this reason, even if the closed sprinkler head is damaged by a mechanical impact or the like, no water loss occurs.

[0005] However, since compressed air is sealed in the secondary pipe of the on-off valve, even if the on-off valve is opened by the operation of the fire detector, the fire extinguishing water is sent to the closed type sprinkler head. Since it takes time, there is a problem that the capacity of the secondary pipe and the capacity of the water pump must be increased.

Further, since the pressure of the compressed air in the secondary pipe is lower than the pressure of the fire-extinguishing water on the primary side, if a fire signal is transmitted by a fire detector for some reason without a fire occurring, the on-off valve is opened. Is opened, fire-extinguishing water flows into the secondary-side pipe regardless of the operation of the closed-type sprinkler head, and a running water signal is output. For this reason, even if a running water signal is received, it cannot be determined whether it is due to the operation of the fire detector or the operation of the closed sprinkler head, that is, whether the closed sprinkler head is operating normally. There are also problems.

In order to solve such a problem, Japanese Patent Publication No. 7-12382 discloses a wet pre-operation type running water detecting device in which low-pressure water is sealed in the secondary side of an opening valve from the primary side. ing. However, in this device, it is necessary to adjust the pressure of the water sealed in the secondary side in the initial state, and the opening valve is used to activate the fire detector and the pressure drop signal of the water sealed in the secondary side. The opening of the valve is complicated by the two signals.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. By filling the secondary pipe with fire extinguishing water having a pressure substantially equal to the atmospheric pressure, the structure is simple and the operation is reliable. An object of the present invention is to provide a highly reliable sprinkler fire extinguishing system capable of reducing water loss even when a closed sprinkler head is damaged by a mechanical impact or the like.

[0009]

[Means for Solving the Problems]

(1) A sprinkler fire extinguishing system according to the present invention includes a closed sprinkler head attached to a secondary pipe, an open / close valve provided at a base end of the secondary pipe, and which is always closed, and A fire detector installed in the same guard area as the mold sprinkler head, control means for opening the on-off valve by an output signal of the fire detector, and a secondary side of the on-off valve, which is always closed A drain valve is provided, and after the pressurized fire extinguishing water is filled in the secondary pipe, the pressure of the fire extinguishing water is adjusted to a non-pressure state by the drain valve.

(2) In the fire extinguishing equipment of the above (1), a branch pipe branched upward from the secondary pipe is provided, and a drain valve is provided in the branch pipe.

(3) In the sprinkler fire extinguishing equipment of the above (1), a branch pipe branched upward from the secondary side pipe is provided, and the branch pipe is provided with opening means which is always open and is closed in case of fire. The secondary pipe was opened. (4) In the sprinkler fire extinguishing equipment of (3), a drain valve is provided in parallel with the opening means.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 is a system diagram of Embodiment 1 of the present invention. In the figure, 1 is a pressurized water supply device having a water supply pump 2, 3 is a normally closed on-off valve, and its primary side is connected to the water supply pump 2 of the pressurized water supply device 1 by a primary pipe 4. ,
A control valve 5 that is always open is connected between the water pump 2 and the on-off valve 3. Reference numeral 6 denotes a remote start valve for opening and closing the on-off valve 3, and reference numeral 7 denotes a manual start valve.

Numeral 8 denotes a secondary pipe connected to the secondary side of the on-off valve 3, to which a water supply pipe 9 is connected. The water supply pipe 9 has a vertical sprinkler head 11 with a closed type sprinkler head 11 attached to the tip. The down pipe 10 is connected. The water supply pipe 9 and the falling pipe 10 may be integrally formed by a flexible pipe. In addition,
In the following description, the secondary pipe 8 may include the water supply pipe 9 and the falling pipe 10. Reference numeral 12 denotes a water flow detecting device provided integrally with the on-off valve 3 or in the vicinity of the on-off valve 3 at the base end of the secondary pipe 8 (downstream of the on-off valve 3), such as a paddle type or a flow sensor. It is.

Reference numeral 13 denotes a drain pipe branched from the secondary pipe 8 on the downstream side of the flowing water detecting device 12, and is provided with a drain valve 14 which is normally closed. The drain valve 14 is opened when checking equipment. And, it is for draining water in the secondary pipe 8. Reference numeral 15 denotes a pressure gauge provided on the secondary pipe 8 on the downstream side of the flowing water detecting device 12. Reference numeral 16 denotes a branch pipe having one end branched upward from the secondary pipe 8, and 17 denotes an automatic drain valve which constitutes an opening means connected to the branch pipe 16. The automatic drain valve 17 is opened when the fire extinguishing water in the secondary pipe 8 is at a low pressure (for example, about atmospheric pressure), and is opened at a high pressure (for example, 1 to 1.5 kgf / cm ² or more, hereinafter referred to as an operating pressure). Is closed automatically.
Reference numeral 18 denotes a manual second drain valve connected to the branch pipe 16 in parallel with the automatic drain valve 22 and is normally closed.

Reference numeral 19 denotes a fire detector installed on a ceiling or the like of a guard area where the closed type sprinkler head 11 is installed.
Reference numeral 0 denotes a controller serving as control means. The fire signal of the fire detector 18 and the running water signal from the running water detection device 12 are input to the controller 20. When a fire signal is input, a control signal is output to the remote start valve 6 to open the on-off valve 3, and when a running water signal is input, a control signal is output to the water supply pump 2 to control the control pump 2. Drive. Reference numeral 22 denotes a pressure air tank having a pressure SW provided immediately downstream of the water supply pump 2, and an output signal thereof is input to the controller 20, and when the pressure in the pressure air tank 22 decreases, the water supply pump 2 May be started.

Next, the operation of the present embodiment configured as described above will be described. First, in the initial state, the manual start valve 7 is operated to open the on-off valve 3. Thereby, the pressure in the primary pipe 4 (for example, 2.0 kgf / cm ² )
Since the fire extinguishing water flows through the secondary pipe 8, the flowing water detecting device 1
2 outputs a running water signal, and the controller 20 which receives the running water signal outputs a control signal to the water supply pump 2 to drive it. When the pressure of the fire-extinguishing water filled in the secondary pipe 8 and the branch pipe 16 becomes equal to the pressure of the fire-extinguishing water in the primary pipe 4, the fire-extinguishing water stops flowing, and the flowing water signal is stopped. The controller 20 sends a control signal to the water pump 2 to stop it. In this state, the manual start valve 7 is operated to close the on-off valve 3. At this time, the internal pressure of the branch pipe 16 becomes the operating pressure, and the automatic drain valve 17 is automatically closed.

Next, the second drain valve 18 is manually opened, the fire extinguishing water in the branch pipe 16 and the secondary pipe 8 is drained while watching the pressure gauge 15, and the fire extinguishing water in the secondary pipe 8 is discharged. When the pressure has decreased to substantially the atmospheric pressure (hereinafter referred to as a non-pressure state), the second drain valve 18 is closed. At this time, the automatic drain valve 17 is automatically opened, the fire extinguishing water in the secondary pipe 8 communicates with the atmosphere to form an open space, and is maintained in a non-pressure state.

Next, in an alert state, the on-off valve 3 is closed, the primary pipe 4 is filled with pressurized fire extinguishing water from the pressurized water supply device 1, and the secondary pipe 8 is filled. Is filled with fire-extinguishing water in a no-pressure state, that is, in an open-to-atmosphere state, as described above.

In the alert state, the closed type sprinkler head 11 may be damaged by a mechanical impact or the like. At this time, since no fire has occurred, the fire detector 19 is not used.
No fire signal is transmitted from the controller to the controller 20, and the on-off valve 3 is not opened. For this reason, only the fire extinguishing water in the secondary pipe 8 flows out from the closed sprinkler head, and the fire extinguishing water is not sprayed over a wide area because of the no-pressure state. , The amount of water and the wetted area are small, and water loss can be minimized. Further, since the fire extinguishing water is not ejected in a wide area because of no pressure, even if there is a fire detector in the vicinity of the closed type sprinkler head, the fire detector does not get wet and cause no malfunction such as malfunction.

Further, if the fire detector 19 is activated for some reason and a fire signal is sent to the controller 20 even though a fire has not occurred, the controller 20 operates based on the fire signal. A control signal is sent to 6 to open the on-off valve 3. As a result, the inside of the secondary pipe 8 is in a non-pressure state,
Fire extinguishing water in the primary pipe 4 flows to the secondary pipe 8 even though the closed sprinkler head 11 is not operating. However, since the fire-extinguishing water is filled in the secondary pipe 8, the same pressure is applied in a very short time and the flow stops. Therefore, the flowing water detection device 12 does not output the flowing water signal, and the water pump 2 Does not work.

When a fire occurs in the alert area, the fire detector 19 detects the fire and sends a fire signal to the controller 20, and the controller 20, which receives the fire signal, sends a control signal to the remote start valve 6 to open and close the on-off valve. Release 3. Then, when the fire extinguishing water on the primary side is sent to the secondary side, the fire extinguishing water having a pressure higher than the operating pressure of the automatic drain valve 17 is sent to the branch pipe 16, so that the automatic drain valve 17 is automatically closed. Then, since the primary side and the secondary side have the same pressure in a very short time and the flow stops, the flowing water detecting device 12 does not output the flowing water signal.

When the closed type sprinkler head 11 is opened by the hot air flow of fire, the fire extinguishing water is discharged, so that the fire extinguishing water is sent from the primary side to the secondary side, and the running water detecting device 12 is opened.
Outputs a running water signal, and the controller 20 having received the same sends a control signal to the water pump 2 to drive it. As a result, fire-extinguishing water having a pressure adapted to the fire-extinguishing pressure is sent to the secondary-side pipe 8 and discharged from the closed-type sprinkler head 11 to extinguish the fire.

When the fire is extinguished, the control valve 5 is closed,
Then, the water pump 2 is stopped. Then, drain valve 14
Then, the second drain valve 18 is opened to drain the water in the secondary pipe 8 and the branch pipe 16, the drain valves 14 and 18 are closed, and the operated closed sprinkler head 11 is replaced. After the control valve 5 is opened, the secondary pipe 8 and the branch pipe 16 are filled with fire extinguishing water in the manner described above, the second drain valve 18 is opened to drain the fire extinguishing water, and the automatic drain valve 17 is opened. It is automatically opened to allow the inside of the secondary pipe 8 to communicate with the atmosphere, and the secondary pipe 8
Adjust the fire extinguishing water inside to no pressure.

In the present embodiment constructed as described above, the secondary side pipe 8 is an open space, which is filled with non-pressure fire-extinguishing water. Without delay of water discharge to 11,
In addition, this makes it possible to reduce the size of the secondary side piping and the like. In addition, the running water detection device 12 outputs a running water signal by the operation of the closed type sprinkler head 11, and the running water signal is not output even if a fire signal is output from the fire detector 19 for some reason during a non-fire. When the running water signal is output, it can be confirmed that the fire extinguishing water is normally discharged from the closed sprinkler head 11.

Even if the closed type sprinkler head 11 is damaged by a mechanical shock or the like, only the fire-extinguishing water filled in the secondary pipe 8 flows out because the on-off valve 3 is closed. Since the service water flows out just below the closed sprinkler head 11 because of no pressure, the amount of water and the area that gets wet with water are small, and water loss can be minimized. Further, since the fire extinguishing water that flows out does not blow out to the surroundings, even if the fire detector 20 is installed in the vicinity of the closed type sprinkler head 11, it does not wet the fire detector 20 and therefore does not cause any functional failure.

Further, in order to make the inside of the secondary pipe 8 non-pressurized, the second drain valve 18 only drains a part of the fire extinguishing water in the branch pipe 16 and the secondary pipe 8. Is simple and very easy to operate. Also, since the branch pipe 16 is branched upward from the secondary pipe 8, the secondary pipe 8
The pressure of the fire extinguishing water in the inside can be adjusted by slightly draining the fire extinguishing water on the secondary side, and even if the automatic drain valve 17 is opened during monitoring, the fire extinguishing water in the secondary pipe 8 can be adjusted. Does not flow out of the branch pipe 16. During monitoring, the automatic drain valve 17 is opened and the inside of the secondary pipe 8 communicates with the atmosphere. Therefore, it is possible to prevent the pressure of the fire extinguishing water from rising, and to surely keep the fire extinguishing water in a non-pressure state.

Embodiment 2 FIG. 2 is a system diagram of Embodiment 2 of the present invention. The same parts as those in Embodiment 1 are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, an electric valve 21 constituting an opening means is provided in the branch pipe 16 in place of the automatic drain valve 17 and the second drain valve 18 of the first embodiment. It is open and closed by a control signal from a controller 20 that has received a fire signal from a fire detector 19.

In this embodiment constructed as described above, in the initial state, a signal is manually sent to the electric valve 21 to close it, the opening valve 3 is opened, and the secondary pipe 8 and the branch pipe from the primary side are opened. 16 is filled with pressurized fire extinguishing water. Then, for example, the motor-operated valve 21 is manually opened to drain the water, the motor-operated valve 21 is kept open to communicate the atmosphere in the secondary pipe 8 with the fire-extinguishing water in the secondary pipe 8 to a non-pressure state. Hold.

When a fire occurs, the motor-operated valve 21 is closed based on a fire signal from the fire detector 19, and the closed-type sprinkler head 11 is closed as in the first embodiment.
Discharge fire-fighting water from and extinguish the fire. The operation and effect at the time of monitoring of the present embodiment are the same as those of the first embodiment.

In the first embodiment, the case has been described in which the fire-extinguishing water in the secondary pipe 8 is drained by the second drain valve 18 provided in the branch pipe 16 to reduce the pressure to a non-pressure state. The advantage of draining the fire extinguishing water by the second drain valve 18 is that the second drain valve 18 is provided through the branch pipe 16, and is required from the secondary pipe 8 even when left open for a long time. As mentioned above, fire extinguishing water is not drained. In other words, it can be said that anyone can easily set the fire extinguishing water in the secondary pipe 8 to a non-pressure state.

The advantages of the provision of the second drain valve 18 are as described above, but the second drain valve 18 is used as a means for draining the fire extinguishing water in order to make the inside of the secondary pipe 8 a pressureless state. Instead of using it, the drain valve 14 of the drain pipe 13 may be used. In this case, the second drain valve 18 provided in the branch pipe 16 may be omitted.

As the simplest equipment for keeping the fire-extinguishing water in the secondary pipe 8 in a non-pressurized state, the branch pipe 16 and the automatic drain valve 17 and the like are omitted, and the drain water is drained downstream of the flowing water detecting device 12. A sprinkler fire extinguishing system provided with the valve 14 is conceivable. In this case, after the pressurized fire extinguishing water is filled in the secondary pipe 8, the fire extinguishing water in the secondary pipe 8 is drained by the drain valve 14 while watching the pressure gauge 15, and the secondary side is discharged. The fire extinguishing water in the pipe 8 may be in a non-pressure state.

[0033]

【The invention's effect】

(1) A sprinkler fire extinguishing system according to the present invention includes a closed sprinkler head attached to a secondary pipe, an on-off valve provided at a base end of the secondary pipe and always closed,
A fire detector installed in the same security area as the closed sprinkler head, control means for opening the on-off valve according to the output signal of the fire detector, and a drain valve provided on the secondary side of the on-off valve and always closed After filling the fire-extinguishing water pressurized in the secondary pipe with the drain valve, the pressure of the fire-extinguishing water is adjusted to a non-pressure state, so that the following effects can be obtained. it can.

Since the fire-extinguishing water in the non-pressure state is filled in the secondary side piping, there is no delay in water supply to the closed type sprinkler head in the event of a fire. Can be reduced in size. Also,
Even if the closed sprinkler head is damaged by mechanical shock, etc., only the fire fighting water filled in the secondary pipe flows out because the open / close valve is closed. Because it flows out just below the closed sprinkler head, the amount of water and the area that gets wet with water are small,
Water damage can be minimized. Further, since the fire extinguishing water that flows out does not blow out to the surroundings, even if the fire detector is installed near the closed type sprinkler head, it does not wet the fire detector, and therefore does not cause a functional failure.

(2) In the sprinkler fire extinguishing equipment of the above (1), a branch pipe branching upward from the secondary pipe is provided, and a drain valve is provided in this branch pipe, so that the fire extinguishing water in the secondary pipe is provided. The pressure can be adjusted by slightly draining the fire extinguishing water in the branch pipe and the secondary pipe. In addition, since a drain valve is provided in the branch pipe, fire-extinguishing water in the secondary pipe is set to a non-pressure state because fire-fighting water is not drained more than necessary from the secondary pipe even if left open for a long time. Is extremely easy to do.

(3) In the sprinkler fire extinguishing equipment of the above (1), a branch pipe branching upward from the secondary side pipe is provided, and an opening means which is always open and closed at the time of fire is provided in this branch pipe, and monitoring is performed. Sometimes, the inside of the secondary pipe is communicated with the atmosphere, so even if there is a temperature rise or leakage of the toilet seat of the on-off valve, etc., it is possible to prevent the pressure of the fire fighting water in the secondary pipe from rising, and the fire fighting water Can be reliably maintained in a no-pressure state. (4) In the sprinkler fire extinguishing equipment of the above (3), since the drain valve is provided in parallel with the opening means, the effects of the above (2) and (3) can be obtained.

[Brief description of the drawings]

FIG. 1 is a system diagram of a first embodiment of the present invention.

FIG. 2 is a system diagram of Embodiment 2 of the present invention.

[Explanation of symbols]

 2 Water supply pump 3 On-off valve 4 Primary side piping 8 Secondary side piping 11 Closed type sprinkler head 12 Flowing water detector 14 Drainage valve 15 Pressure gauge 16 Branch pipe 17 Automatic drainage valve (opening means) 18 Second drainage valve 19 Fire detection 20 Controller (control means) 21 Motorized valve (opening means)

Claims (4)

[Claims] 1. A closed sprinkler head attached to a secondary pipe, an on-off valve provided at a base end of the secondary pipe, which is always closed, and the same security zone as the closed sprinkler head And a control means for opening the on-off valve according to an output signal of the fire sensor, and a drain valve provided on the secondary side of the on-off valve and always closed, Sprinkler fire extinguishing equipment, characterized in that after pressurized fire extinguishing water is filled in a secondary pipe, the pressure of the fire extinguishing water is adjusted to a non-pressure state by the drain valve. 2. The sprinkler fire extinguishing system according to claim 1, wherein a branch pipe branched upward from the secondary pipe is provided, and a drain valve is provided in the branch pipe. 3. A method according to claim 1, wherein a branch pipe is provided which branches upward from the secondary pipe, and an opening means which is always open to the branch pipe and is closed in case of a fire is provided to make the secondary pipe open space. The sprinkler fire extinguishing equipment according to claim 1, wherein 4. The sprinkler fire extinguishing system according to claim 3, wherein a drain valve is provided in parallel with the opening means.