JP2002291937A - Sprinkler fire extinguishing facilities - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sprinkler fire extinguishing facilities free from the fear that a piping might be frozen even in a cold district by preventing water from being accumulated in a secondary-side piping including the joint pipe of a sprinkler head not only during monitoring the piping but also after inspection. SOLUTION: In the sprinkler fire extinguishing facilities provided with the dry secondary-side piping 8 connected with the sprinkler head 8 and, containing no water normally, a control valve 3 provided on the side of the base end of this piping 8 to switch connection between with a water supply main pipe 1, a fire detection means 11 for detecting the fire and a control means 17 for opening the valve 3 when the means 11 operates, a chamber 15 having a fixed capacity is formed at the secondary-side piping 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire extinguishing system for sprinklers, and more particularly to a fire extinguishing system for sprinklers that can be used in cold regions.

[0002]

2. Description of the Related Art As an example of this type of sprinkler fire extinguishing equipment, there is an invention disclosed in Japanese Patent Application Laid-Open No. 7-60171. In the sprinkler fire extinguishing system according to the present invention, as shown in FIG. 2, a drain plug 22 is connected between a primary pipe 21 and a secondary pipe 26, and a driving unit 25 moves a piston 24 upward, thereby And the secondary pipe 26 is made conductive to make a water outflow state, and when it is moved downward, the primary pipe 21 and the secondary pipe 26 are shut off, the secondary pipe 26 and the drain port 23 are made conductive, and the water in the secondary pipe 26 is drained. This is to drain the water from the drain port 23.

[0003] Normally, the piston 24 is moved downward to cut off the primary pipe 21 and the secondary pipe 26, and the secondary pipe 26 is connected to the drain port 23 to make the inside of the secondary pipe 26 anhydrous. To prevent freezing. In the event of a fire, a fire signal from the fire detector 27 is transmitted to the controller 3.
0, and the controller 30 controls the drive unit 25 of the drain plug 22.
The primary pipe 21 and the secondary pipe 26 are electrically connected, the drain port 23 is closed, water is supplied to the secondary pipe 26, water is discharged from the sprinkler head 28, and the fire is extinguished.

[0004]

In such a sprinkler fire extinguishing system, the piston 24 of the drain plug 22 is prevented from sticking, and the controller 30 and the drive unit 2 of the drain plug 22 are connected.
In order to monitor the disconnection of the signal line S connecting to the control unit 5, it is necessary to periodically control the opening and closing of the drain plug 22 for inspection. However, in the conventional sprinkler fire extinguishing equipment as described above, when the drain plug 22 is opened and water flows through the secondary pipe 26, water that cannot be drained stays at the joint pipe 29 of the sprinkler head 28. In a cold region, there is a possibility that this portion may freeze, and the freezing may damage the sprinkler head 28 and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and water does not stay in secondary pipes including a joint pipe of a sprinkler head, not only at the time of monitoring but also after inspection. It is an object of the present invention to provide a sprinkler fire extinguishing system that does not cause the pipe to freeze in the ground.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a connection between a secondary pipe connected to a sprinkler head and always in a dry state without water, and a water supply main pipe provided at a base end side of the secondary pipe. A control valve that opens and closes, and a fire detection means that detects a fire,
A sprinkler fire extinguishing system comprising a control means for opening the control valve when the fire detecting means is activated, wherein a chamber having a predetermined volume is provided in the secondary pipe.

In the above-described sprinkler fire extinguishing equipment, the control valve is constituted by an electric drain valve, and the chamber is provided with an intake valve. Further, in the control means, the control valve is periodically opened, and when a response signal is received, the control valve is closed.

[0008]

FIG. 1 is an explanatory view of a sprinkler fire extinguishing system according to one embodiment of the present invention. In the figure,
Reference numeral 1 denotes a water supply main pipe which is a water supply source of a sprinkler fire extinguishing system buried underground, and 2 denotes a meter box provided in the water supply main pipe 1. Reference numeral 3 denotes a control valve such as an electric drain plug buried underground, which has a primary connection port 4, a secondary connection port 5, and a drain port 6 provided at a lower or side portion. The port 4 is connected to the water supply main pipe 1 on the downstream side of the meter box 2, and the secondary connection port 5 is connected to a base end side of a water supply pipe 8 described later. In addition, the drain port 6 is opened underground through a check valve.

The control valve 3 includes a vertically movable valve body and a plurality of valve seats (not shown), and the valve body is driven by a motor 7 as a driving means provided on the ground, for example, When it moves upward, the space between the primary connection port 4 and the secondary connection port 5 is opened to connect the water supply main pipe 1 and the water supply pipe 8, and the drain port 6 is closed. When it moves downward, the primary connection port 4 and the secondary connection port 5 are closed, and the water supply main pipe 1 and the water supply pipe 8 are closed.
And the drain port 6 is opened to open the secondary connection port 5,
Therefore, it communicates with the water supply pipe 8 and constitutes a kind of three-way valve. Note that the control valve 3 is not limited to the above-described configuration, and a control valve having another configuration may be used. For example, a disk driver that rotates left and right is provided in the motor 7, and the distal end of the disk driver A disk may be provided as a valve body, and the valve body may be opened and closed by rotation.

Reference numeral 8 denotes a water supply pipe which is buried in the ground and whose base end is connected to the secondary connection port 5 of the control valve 3, rises to the ground from the middle, and has an upper end part laterally above the ceiling. (Hereinafter referred to as a branch pipe) (hereinafter, referred to as a branch pipe).
The water supply pipe 8 and the branch pipe 9 may be collectively referred to as a secondary pipe 8). Reference numeral 10 denotes a sprinkler head provided with a fire detecting means 11 comprising, for example, a contact mechanism, which outputs an operation (fire) signal when a fire occurs, and is connected to the branch pipe 9 via a joint pipe 12. Specifically, a cover 10a is attached to the lower part of the sprinkler head 10 by soldering, and when the solder is melted by the heat of a fire and the cover 10a falls, the proximity switch as the fire detecting means 11 is activated. ing. In the secondary pipe 8, the primary connection port 4 and the secondary connection port 5 of the control valve 3 are normally closed by a valve body, and the water supply main pipe 1 and the secondary pipe 8 are shut off. The inside of the secondary pipe 8 is in a dry state without water.

Reference numeral 15 denotes a chamber having a predetermined capacity connected to the water supply pipe 8 on the ground, and provided on the primary side of the branch pipe 9. An intake valve 16 provided in the chamber 15 is normally closed, and is opened when the pressure in the chamber 16 becomes negative. The capacity of the chamber 15 is determined by the total length of the secondary pipe 8 and the branch pipe 9 and the pressure of the fire extinguishing water supplied to the secondary pipe 8 and the branch pipe 9. 9), the capacity of the chamber 15 needs to be increased as the pressure of the extinguishing water increases.

Now, an example of the size of the capacity of the chamber 15 will be described as follows. For example, the water supply pipe 8 from the secondary connection port 5 of the control valve 3 to the lower end of the chamber 15
Is 3 m, the length of the water supply pipe 8 (including the height of the chamber 15) from the lower end of the chamber 15 to the connection portion of the branch pipe 9 is 3 m, and the length of the branch pipe 9 is 10 m. If the diameter is 30 cm, the capacity of the chamber 15 is calculated as shown in Table 1. In this case, the capacity of the chamber 15 is such that even if the control valve 3 is opened at the time of inspection and water is supplied after the response signal is obtained until the control valve 3 is closed, even if the branch pipe 9
Shall have at least a capacity capable of preventing water from flowing into the water. In other words, the time required for the inspection is shorter than the time when the chamber 15 is filled with water. Note that this is an example, and can be changed as appropriate according to the situation.

[0013]

[Table 1]

Reference numeral 17 denotes a control unit as a control means, an alarm,
A control panel equipped with an ₁ Spring through
The fire detection means 11 of the club head 10 is connected,
Also, the signal line S_Two The motor 7 of the control valve 3 is connected via
Have been. The control panel 17 is used as a standby power supply.
Built-in battery and power failure detection circuit.
With this battery, the signal line S_Two Of the control valve 3 through the
The power is supplied to the₁ Also power supply, blackout
Even if a fire occasionally occurs, it can be surely extinguished
You.

Next, the operation of the sprinkler fire extinguishing system configured as described above will be described. In the sprinkler fire extinguishing system, as described above, the primary connection port 4 and the secondary connection port 5 of the control valve 3 are always closed by a valve body at the time of monitoring (monitoring). There is no water in 8,
It is dry. Therefore, the piping does not freeze even in a cold region.

[0016] fire occurs fire detection unit 11 by the hot air flow and flame work (e.g., closing the contact of the contact mechanism), the operation to the control unit of the control panel 17 by short-circuiting the signal lines S ₁ (fire) Output a signal. When the control unit receives this operation signal, the control unit 17 sounds an alarm to notify that a fire has occurred.

When the control unit receives the operation signal from the fire detecting means 11, it sends an open signal to the motor 7 of the control valve 3 to drive the motor 7. As a result, the valve body rises to open the primary connection port 4 and the secondary connection port 5, close the drain port 6, and connect the water supply main pipe 1 to the secondary pipe 8 to supply water of a predetermined pressure. Is supplied to the secondary pipe 8, and water is filled in the secondary pipe 8 including the chamber 15. Thereafter, when the sprinkler head 10 is operated and opened, the fire extinguishing water is discharged from the sprinkler head 10 and extinguishes the fire.

Incidentally, in such a sprinkler fire extinguishing system, as described above, it is necessary to periodically check whether the control valve 3 operates reliably. In the present invention, a timer (not shown) is provided in the control panel 17 so that the control section automatically and periodically (for example, once a month).
Is set to output an open signal.

When an open signal is output from the control unit to the motor 7 of the control valve 3 in response to a command from the timer, the motor 7
Is driven to move the valve body upward, the water supply main pipe 1 and the secondary pipe 8 communicate with each other to supply water into the secondary pipe 8, and first, the chamber 15 is filled with water. On the other hand, when the control valve 3 operates reliably, a limit switch (not shown) provided on the control valve 3 operates to output a response signal to the control unit (this takes several seconds).

The control unit having received the response signal from the limit switch outputs a close signal to the motor 7. The motor 7 receives this signal and drives the valve element to shut off (close) the water supply main pipe 1 and the secondary pipe 8, open the drain port 6 and communicate with the secondary pipe 8. In the case of a fire, even if the control unit receives the response signal, the space between the water supply main pipe 1 and the secondary pipe 8 is not closed. During this time, the water sent from the water supply main pipe 1 is charged into the chamber 15. In this case, the chamber 15
The inside may be full and the water supply pipe 8 on the downstream side may be filled with water within a range that does not reach the branch pipe 9.

When the space between the water supply main pipe 1 and the secondary pipe 8 is shut off and the drain port 6 is opened to communicate with the secondary pipe 8,
The water in the chamber 15 (including the case where water is filled in the water supply pipe 8 on the downstream side thereof) and in the secondary pipe 8 on the upstream side thereof are drained from the drain port 6 into the ground, and the chamber 15 is discharged. The inside of the secondary pipe 8 including 15 is depleted of water and becomes a dry state.
At this time, when the pressure in the chamber 15 becomes negative, the intake valve 16 is opened and the atmospheric pressure is introduced into the chamber 15, so that the drainage of water in the chamber 15 and the secondary pipe 8 is promoted.

In the above description, the case where the sprinkler head 10 provided with the fire detecting means 11 for detecting the occurrence of a fire is shown. However, instead of this, a normal fire detector and a sprinkler head are provided to The device may be connected to the control panel 17 by a signal line.

Further, a water level sensor is provided in the chamber 15, and when the level of the water charged in the chamber 15 reaches a certain level, this is detected and an alarm is sounded, or a display device or the like is used. When the alarm is sounded or a display is displayed on the display during the periodic inspection, the water supply pipe 1 and the secondary pipe 8 may be shut off manually. With this configuration,
Control valve 3 due to malfunction of fire detector or fire detection means
, The water supply main pipe 1 and the secondary pipe 8 communicate with each other and water is supplied to the secondary pipe 8, so that water supply can be interrupted at an early stage.

As is apparent from the above description, according to the present invention, the secondary pipe 8 including the chamber 15 is not filled with water during monitoring and is in a dry state, so that the secondary Even if water is supplied to the side pipe 8, this water remains in the chamber 15 or in the water supply pipe 8 on the downstream side thereof, and then is supplied to the branch pipe 9.
Since the water is drained after the inspection, the inside of the secondary pipe 8 including the chamber 15 and the inside of the joint pipe 12 are always in a dry state. Therefore, even in a cold region, there is no possibility that the piping is frozen or damaged, and water can be reliably discharged from the sprinkler head 10 in the event of a fire.
In addition, this invention can be implemented also in the normal dry-type sprinkler fire extinguishing equipment provided in buildings, such as a building.

[0025]

According to the present invention, there is provided a control for opening and closing a connection between a sprinkler head connected to a secondary pipe in a dry state which is always free of water and a water supply main pipe provided at a base end side of the secondary pipe. In a sprinkler fire extinguishing system equipped with a valve, fire detecting means for detecting a fire, and control means for opening a control valve when the fire detecting means operates, a chamber having a fixed volume is provided in a secondary pipe. Therefore, even if the control valve is opened during inspection, water stays in the chamber or downstream of the chamber and does not flow into the branch pipe. Since it can be maintained in an anhydrous and dry state, it is possible to prevent the pipe from freezing even in a cold region. In addition, since it takes time for the capacity of the chamber to allow water to flow into the branch pipe, even if the fire detection means or the fire detector malfunctions, the control valve must be manually closed while water remains in the chamber. Therefore, inflow of water into the branch pipe can be prevented.

In the above-described sprinkler fire extinguishing system, the control valve is constituted by an electric water drain plug and the chamber is provided with an intake valve, so that water in the chamber and in the secondary pipe upstream of the chamber is electrically operated water. Since the atmospheric pressure is introduced into the chamber from the drain valve through the drain port and the intake valve opened by the negative pressure of the pipe, the drainage can be promoted.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of an example of a conventional sprinkler fire extinguishing equipment.

[Explanation of symbols]

1 water supply main pipe, 3 control valve, 8 water supply pipe (secondary pipe), 9 branch pipe, 10 sprinkler head, 11 fire detection means, 12 joint pipe, 15 chamber, 16 intake pipe, 17 control panel.

Claims (3)

[Claims] 1. A dry secondary pipe connected to a sprinkler head and always free of water, a control valve provided at a base end of the secondary pipe to open and close a connection with a water supply main pipe, and a fire valve. And a control means for opening the control valve when the fire detection means operates, wherein a chamber having a predetermined volume is provided in the secondary pipe. Sprinkler fire extinguishing equipment. 2. The control valve according to claim 1, wherein the control valve is an electric drain valve and the chamber is provided with an intake valve.
The described sprinkler fire extinguishing equipment. 3. The sprinkler fire extinguishing system according to claim 1, wherein the control means opens the control valve periodically and closes the control valve when receiving a response signal.