JP4726944B2 - Pre-actuated sprinkler equipment - Google Patents

Description

The present invention relates to a pre-actuated sprinkler facility.

In the pre-actuated sprinkler facility, fire extinguishing water is sprayed from the sprinkler head when both the fire detector installed in the room and the sprinkler head are activated by a fire.

The pre-actuated water detector used in the pre-actuated sprinkler facility is provided in the middle of the pipe connected from the water source to the sprinkler head, and the primary side of the pre-actuated water detector is connected to the water source. The secondary side is connected to the sprinkler head.

Piping connected to the secondary side of the pre-actuated water flow detection device, so-called secondary side piping filled with gas such as air or non-combustible gas is called dry pre-acting sprinkler equipment, which is filled with extinguishing water. Wet pre-actuated sprinkler equipment.

In both the dry and wet processes, the valve element inside the pre-actuated water flow detector is closed during normal times. When the fire detector is activated in the event of a fire, the valve body is opened and the water channel from the water source to the sprinkler head is opened. In the case of dry type, fire extinguishing water flows into the secondary side piping.

When a fire occurs in the pre-actuated sprinkler system, the fire detector is activated by the heat of the fire, and the valve body of the pre-actuated water flow detector is opened. Then, the fire extinguishing water on the primary side can be passed through to the secondary side, and in the case of a dry type, the secondary side pipe is filled with water.

When the sprinkler head is operated following the operation of the fire detector, the water filled in the secondary side pipe is discharged from the sprinkler head. Next, the pump is activated, pumps out the fire extinguishing water from the water source, supplies it to the sprinkler head, and continuously spreads the fire extinguishing water to suppress and extinguish the fire.

When the sprinkler head is activated in a time other than during a fire, the valve body of the pre-actuated water flow detector remains closed, so only the gas or fire extinguishing water in the secondary pipe will flow out, even in the case of a wet type. Damage caused by water leakage can be minimized.

In recent years, wet pre-actuated sprinkler equipment that has a simple equipment configuration and that immediately discharges fire-fighting water in the event of a fire has attracted attention. In addition, in order to reduce the amount of water loss when the sprinkler head malfunctions in a wet pre-actuated sprinkler facility, if only the sprinkler head is activated without the fire sensor being activated, the water in the secondary side pipe will be drained. There is a sprinkler facility that can reduce the amount of water discharged from the sprinkler head by draining or suctioning to suppress water damage (for example, see Patent Documents 1 and 2).

JP 2000-51385 A (page 2-3, FIG. 1) JP 2000-140148 A (page 2-4, FIG. 1)

Since the sprinkler equipment described in Patent Documents 1 and 2 uses electrical means for starting the drainage means and suction means, it is necessary to secure an emergency power source in order to reliably operate even in an emergency, Equipment costs would increase.

Therefore, in view of the above problems, the present invention aims to provide a pre-actuated sprinkler facility provided with drainage means that can be activated without using electrical means for activation of the drainage means.

In order to achieve the above object, the invention according to claim 1 is characterized in that the primary side is connected to the water supply source, the secondary side is installed in the sprinkler head, and is opened by the operation of the fire sensor installed in the vicinity of the sprinkler head. A pre-actuated sprinkler facility comprising: an open valve, and drainage means for discharging the secondary side liquid when the pressure on the secondary side of the open valve drops below the first pressure,
The open valve is internally divided into a primary chamber and a secondary chamber by a partition, and a communication port that communicates the primary chamber and the secondary chamber is opened in the partition, and the communication port is a valve body of an open valve. And is closed by a spring that is installed on the back surface of the valve body of the release valve and biases toward the communication port side,
The control chamber provided on the back surface of the valve body of the open valve communicates with the primary chamber and the secondary chamber through a small hole,
Between the communication port and the valve body of the open valve, a movable valve seat having an extended portion that is movable inside the communication port and has both ends expanded outward is installed. The movable valve seat is urged toward the valve body side of the release valve by a disc spring installed on the outer periphery of the seat, and the bottom surface of the valve body of the release valve is in contact with the movable valve seat,
Furthermore, the drainage means includes a valve body of the drainage means that opens and closes the flow path for discharging the liquid on the secondary side, and a spring that biases the valve body of the drainage means in the valve closing direction. A rod is provided between the valve body of the drainage means and the bottom surface of the valve body of the release valve,
When the pressure on the secondary side of the release valve drops below the first pressure, the valve body of the release valve and the movable valve seat move to the rod side due to the pressure of the liquid in the control chamber. The pre-actuated sprinkler facility is characterized in that the valve body of the drainage means is opened.

According to the above invention, the drainage means is activated regardless of the decompression detection means in the secondary side piping as in the conventional sprinkler equipment, and no power supply or wiring is required by not using electrical means. Yes, it is possible to provide drainage means with a simple configuration.

Also, the drainage means is provided integrally with the release valve, and the drainage means is operated in conjunction with the movement of the valve body of the release valve due to the pressure reduction on the secondary side, and the drainage means and the release valve are installed integrally This makes it possible to reduce the size and cost of the apparatus.

In practicing the present invention, the drainage means is preferably opened by reducing the pressure on the secondary side of the release valve. In addition, the valve body is closed when the pressure on the secondary side of the open valve is restored.

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a system diagram of a pre-actuated sprinkler system of the present invention, and FIG. 2 is a sectional view of an open valve. FIG. 3 shows a cross-sectional view of FIG. 5 when the sprinkler head malfunctions. Note that the pre-actuated sprinkler equipment of this embodiment is one in which drain means is integrally installed on an open valve.

As shown in FIG. 1, the pre-actuated sprinkler equipment of the present invention includes a water source 1, a pump 2, an open valve 3, a sprinkler head 4, and a drainage device 5. These components are connected by piping, and are divided into a primary side pipe 6 and a secondary side pipe 7 with the normally closed open valve 3 as a boundary. Fire extinguishing water is contained in the primary side pipe 6 and the secondary side pipe 7. Filled.

The water source 1 is a water tank that stores fire extinguishing water. The pump 2 is a pressurized water feeding device that feeds the fire extinguishing water of the water source 1 to the sprinkler head activated in the event of a fire, and the pump 2 is activated when the pressure value of the pressure tank 8 installed in the primary side pipe 6 falls below a predetermined pressure. Is done.

The open valve 3 is denoted by reference numeral 40 in FIGS. 2 and 3, and the inside thereof is divided into a primary chamber I and a secondary chamber II by a partition wall 9 as shown in the figure. The partition wall 9 is provided with a communication port 10 that communicates the primary chamber I and the secondary chamber II. The communication port 10 is installed on the bottom surface of the bottomed cylindrical valve body 11 and the valve body 11, and is connected to the communication port 10 side. It is closed by a spring 12 that urges to.

The side surface of the valve body 11 can slide along the inner wall of the valve box. A space called a control chamber 13 is formed on the back surface of the valve body 11 by the valve body 11 and the inner wall of the valve box, and the valve body 11 is made to flow into and out of the control chamber 13 by discharging and extinguishing fire water. It slides along the inner wall, and the communication port 10 can be opened and closed.

A plurality of small holes 46 are formed in the valve body 11 so that fire-extinguishing water in the primary chamber I can flow into the secondary chamber II through the control chamber 13. The diameter of the small hole is set so that the amount of water passing through the small hole 46 communicating from the control chamber 13 to the secondary chamber II is smaller than the flow rate when one sprinkler head is operated.

The fire extinguishing water in the control chamber 13 is also discharged into the secondary chamber II through the small hole 46 formed in the valve body 11, and the primary chamber I, the control chamber 13, and the secondary chamber II are in the same pressure state. Yes.

A connection port 15 is installed in the control chamber 13, a drain pipe is connected to the connection port 15, and a motor valve 20 that is normally closed is installed on the water distribution pipe. The motor-operated valve 20 is opened by the operation of a fire sensor 21 installed in the vicinity of the sprinkler head 4. When the motor-operated valve 20 is opened, the fire extinguishing water in the control chamber 13 is drained, and the valve body 11 is separated from the communication port 10 so that the primary chamber I and the secondary chamber II can communicate with each other.

In the open valve 40 shown in FIG. 2, the communication port 10 is provided with a movable valve seat 41 having a cylindrical shape and expanded at both ends in the radially outward direction. The valve body 11 is biased and the movable valve seat 41 is in contact with the bottom surface of the valve body 11.

On the extension of the shaft of the valve body 11 on the secondary chamber II side, a drain port D is provided and a drain pipe is connected. A valve seat 43A and a valve body 43B are provided in front of the drain port D, and a rod 44 that contacts the bottom surface of the valve body 11 is fixedly installed on the valve body 43B. The valve body 43B is biased toward the valve seat 43A by the spring 45, and the valve body 43B is normally closed.

The sprinkler head 4 is activated by the heat of the fire, and spreads fire-extinguishing water in the secondary side pipe 7 uniformly in the room. Since the sprinkler head is well known, a description thereof will be omitted.

Next, the operation of the pre-actuated sprinkler facility of this embodiment will be described.
During normal times, the open valve 40 is kept closed, and the primary side pipe 6 and the secondary side pipe 7 are filled with fire-extinguishing water. When a fire occurs, the fire detector 21 is activated to activate the motor-operated valve 20 of the release valve 3 to drain the fire-extinguishing water in the control chamber 13 and open the valve body 11.

The opening of the valve body 11 allows the primary chamber I and the secondary chamber II to pass through fire extinguishing water. When the sprinkler head 4 is operated following the operation of the fire detector 21, the fire extinguishing water inside the secondary side pipe 7 is discharged from the activated sprinkler head 4. The operation of the sprinkler head 4 depressurizes the inside of the secondary side pipe 7, and the fire extinguishing water in the primary side pipe 6 also passes through the release valve 40 and is supplied to the secondary side pipe 7. Reduce pressure.

When the pressure in the primary side pipe 6 is reduced, the pressure in the pressure tank 8 is also reduced, a pump activation signal is output from the pressure tank 8, and the pump 2 is activated. Fire extinguishing water pumped up from the water source 1 by starting the pump 2 passes through the primary side pipe 6, the open valve 40 and the secondary side pipe 7, is continuously supplied to the activated sprinkler head, and is discharged from the sprinkler head 4. Fire extinguishing water is sprayed evenly in the room and the fire is extinguished.

Next, the case where the sprinkler head on the pre-actuated sprinkler equipment of this embodiment malfunctions will be described.

When the sprinkler head 4 is activated except during a fire, the valve body 11 of the release valve 40 remains closed, and the fire extinguishing water in the secondary side pipe 7 flows out of the activated sprinkler head 4 and The inside of the secondary pipe 7 and the inside of the secondary chamber II are depressurized. At that time, the fire extinguishing water flows from the primary chamber I through the control chamber 13 to the secondary chamber II, but the amount of water in the small hole communicating the control chamber 13 and the secondary chamber II is the extinguishing water discharged from the sprinkler head. Therefore, the pressure in the secondary pipe 7 is continuously reduced.

When the difference between the pressure in the secondary side pipe 7 and the pressure in the control chamber 13 increases, the disc spring 42 urging the movable valve seat 41 by the pressure in the control chamber 13 is crushed by elastic deformation, and the valve body 11 and the movable valve seat 41 move to the secondary chamber II side.

Along with the movement of the valve body 11, the rod 44 in contact with the valve body 11 is also moved in the same direction, and the valve body 43B fixedly installed on the rod 44 is separated from the valve seat 43A and the fire extinguishing water in the secondary chamber II is Drained from the drain D. This makes it possible to reduce damage caused by water damage when the sprinkler head malfunctions.

In addition, as an embodiment other than the above, the open valve and the drainage means may be provided separately, or the drainage means may be provided on the secondary side pipe connected to the secondary side of the open valve. Further, when the pressure on the secondary side of the release valve drops below the first pressure, the secondary side liquid is discharged, and the secondary side pressure of the release valve becomes the first pressure after the drainage means is activated. The structure that closes when the pressure is exceeded has the following effects.

When the pressure in the secondary side pipe is reduced by the operation of the sprinkler head and the pressure reaches the first pressure, the drainage means is activated and the fire extinguishing water in the secondary side pipe is discharged. The secondary side pipe is depressurized by the activation of the drainage means, but when the fire detector is activated later, the pump is started and the pressurized water flows into the secondary side pipe. When the pressure in the secondary side pipe becomes equal to or higher than the first pressure, the drainage means stops and fire-extinguishing water is stably discharged from the sprinkler head.

It is also possible to provide a decompression flow means that allows water to flow from the primary side to the secondary side of the open valve when the pressure on the secondary side of the open valve drops below the second pressure higher than the first pressure. It is.

According to the above configuration, the fire extinguishing water in the secondary side piping gradually decreases due to pressure fluctuations due to changes in temperature, small amounts of leakage from the joints of the piping, etc. Further, a decompression flow means that starts at a second pressure set to be equal to or higher than the first pressure is provided. The fire-extinguishing water in the secondary pipe can be maintained at a pressure higher than a predetermined pressure at which the drainage means is not activated at the time of warning by the decompression flow means.

System diagram of pre-actuated sprinkler equipment of the present invention Cross section of release valve Cross section of Fig. 2 when the sprinkler head malfunctions

Explanation of symbols

1 Water source
2 Pump
3, 40 Opening valve
4 Sprinkler head
5 Drainage device
10 communication port
11 Disc
13 Control room
20 Motorized valve
21 Fire detector
40 Opening valve of Example 3
41 Movable valve seat
42 Belleville spring
43A Valve seat for drainage means
43B Valve of drainage means
45 Spring
44 Rod
46 Small hole

Claims (1)

The primary side is connected to the water supply source, the secondary side is installed in the sprinkler head, the release valve opened by the operation of the fire sensor installed in the vicinity of the sprinkler head, and the pressure on the secondary side of the release valve is the first In a pre-actuated sprinkler facility comprising a drainage means for discharging the liquid on the secondary side by dropping below the pressure of
The open valve is internally divided into a primary chamber and a secondary chamber by a partition, and a communication port that communicates the primary chamber and the secondary chamber is opened in the partition, and the communication port is a valve body of an open valve. And is closed by a spring that is installed on the back surface of the valve body of the release valve and biases toward the communication port side,
The control chamber provided on the back surface of the valve body of the open valve communicates with the primary chamber and the secondary chamber through a small hole,
Between the communication port and the valve body of the open valve, a movable valve seat having an extended portion that is movable inside the communication port and has both ends expanded outward is installed. The movable valve seat is urged toward the valve body side of the release valve by a disc spring installed on the outer periphery of the seat, and the bottom surface of the valve body of the release valve is in contact with the movable valve seat,
Furthermore, the drainage means includes a valve body of the drainage means that opens and closes the flow path for discharging the liquid on the secondary side, and a spring that biases the valve body of the drainage means in the valve closing direction. A rod is provided between the valve body of the drainage means and the bottom surface of the valve body of the release valve,
When the pressure on the secondary side of the release valve drops below the first pressure, the valve body of the release valve and the movable valve seat move to the rod side due to the pressure of the liquid in the control chamber. A pre-actuated sprinkler facility in which a valve body of the drainage means is opened.

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