JP7058779B2 - Sprinkler fire extinguishing equipment - Google Patents

Description

The present invention relates to dry or pre-actuated sprinkler fire extinguishing equipment.

As the sprinkler fire extinguishing equipment, generally, a wet equipment in which fire extinguishing water is constantly pressurized and filled in the piping on the primary side and the secondary side of the alarm valve (also referred to as "flow detection device") is used. However, depending on the object to be protected, dry or pre-actuated equipment in which the piping on the secondary side of the alarm valve is constantly filled with pressurized gas is also used (see, for example, Patent Document 1). ..

Specifically, the dry sprinkler fire extinguishing system is used for an object such as a building under an outer eaves or a building without heating in a cold region where the fire extinguishing water in the pipe may freeze. The closed state of the alarm valve is always maintained to block the flow of fire extinguishing water into the piping on the secondary side. In the event of a fire, the sprinkler head is opened to open the alarm valve. Then, fire extinguishing water flows into the piping on the secondary side and is discharged from the sprinkler head at the end.

Further, the pre-actuated sprinkler fire extinguishing equipment is used for an object such as a communication equipment room or a computer room where it is particularly necessary to avoid water damage due to damage to the sprinkler head. In addition to the alarm valve and the sprinkler head, a fire detector is further provided, and in the event of a fire, the alarm valve is opened by the operation of the fire detector. That is, even if only the sprinkler head malfunctions, the alarm valve does not open by itself, so that water damage can be prevented.

Japanese Unexamined Patent Publication No. 2013-192583

Here, the dry or pre-actuated sprinkler fire extinguishing equipment is the same as the wet equipment, but
The piping on the secondary side of the alarm valve branches into a plurality of branch pipes toward each protected area, and a sprinkler head is provided in each of the plurality of branch pipes.

In such dry or pre-actuated sprinkler fire extinguishing equipment, if the withstand voltage performance of the piping on the secondary side of the alarm valve can be lowered, the equipment cost can be reduced .

In view of the above circumstances, it is an object of the present invention to obtain a sprinkler fire extinguishing system capable of lowering the withstand voltage performance of the piping on the secondary side of the alarm valve and reducing the equipment cost.

The present invention is provided at a position on the secondary side of an alarm valve that is normally closed, has a secondary side main to which the proximal end side is connected to the secondary side of the alarm valve, and has the secondary side. A secondary side pipe having a plurality of branch pipes branched from the main pipe and to which a sprinkler head is connected is provided, and the secondary side pipe is always filled with a pressurized gas and held at the first pressure. In the sprinkler fire extinguishing equipment, it is assumed that the fire extinguishing water is controlled and supplied into the secondary side pipe to a second pressure higher than the first pressure, and the primary side pressure is applied to the secondary side pipe. It is closed when the secondary side pressure is held at the same pressure, while when the primary side pressure becomes higher than the secondary side pressure, a predetermined magnitude is set between the primary side and the secondary side. It is a sprinkler fire extinguishing facility characterized by being provided with an open valve that opens when a differential pressure is generated.

Further, in the present invention, in the open valve, when the alarm valve is opened and the primary side pressure becomes the second pressure, the secondary side sprinkler head is not opened and the secondary side pressure is increased. When held at the first pressure, the differential pressure generated between the primary side and the secondary side does not release the pressure, while the alarm valve opens and the primary pressure becomes the second pressure. When the secondary side sprinkler head is opened and the secondary side pressure drops to atmospheric pressure, the difference pressure generated between the primary side and the secondary side is the difference. It is a sprinkler fire extinguishing facility characterized by opening .

Further, in the present invention, the open valve is provided with a communication port that penetrates between the primary side pressure receiving portion and the secondary side pressure receiving portion of the valve body and communicates between the primary side and the secondary side. The communication port is provided with an auxiliary valve that normally opens the communication port, while closing the communication port when the primary pressure becomes the second pressure while the valve body is closed. It is a sprinkler fire extinguishing facility that is characterized by this.

Further, in the present invention, the open valve is an intermediate chamber provided in the seat portion on which the valve body is seated, and when the valve body is seated, an opening facing the peripheral portion of the primary side pressure receiving portion is provided. An intermediate chamber having a communication portion that communicates with the outside of the valve box is provided, and the communication portion always opens the terminal opening to the terminal opening on the outer side of the valve box to open the intermediate chamber to the atmosphere. The sprinkler fire extinguishing equipment is characterized in that an air vent valve for closing the end opening is provided when the valve body is opened and the fire extinguishing water of the second pressure flows in .

In the present invention, the open valve may be provided on the proximal end side of each of the plurality of branch pipes. An open valve similar to that provided on the proximal end side of each of the plurality of branch pipes may be further provided at a position in the vicinity of the alarm valve in the secondary main pipe. The secondary side main is a secondary side main main whose base end side is connected to the secondary side of the alarm valve, and a plurality of secondary side branch mains branching from the secondary side main main. It is possible to have, and to further provide an open valve similar to that provided on the proximal end side of each of the plurality of branch pipes on the proximal end side of each of the plurality of secondary branch mains. can. The open valve is formed so that the pressure receiving area of the secondary side pressure receiving portion is larger than the pressure receiving area of the primary side pressure receiving portion by a predetermined ratio, and the opening / closing operation is controlled by the valve body. Can be.

In the present invention, the first pressure of the pressurized gas in the secondary side pipe can be lowered at all times. As a result, the withstand voltage performance of the secondary side piping can be lowered in terms of equipment design, and the equipment cost can be reduced.

Therefore, according to the present invention, it is possible to obtain a sprinkler fire extinguishing system capable of lowering the withstand voltage performance of the piping on the secondary side of the alarm valve and reducing the equipment cost.

Further, in the present invention, the open valve is provided with a communication port that penetrates between the primary side pressure receiving portion and the secondary side pressure receiving portion of the valve body and communicates between the primary side and the secondary side. It is assumed that the communication port is provided with an auxiliary valve that normally opens the communication port, but closes the communication port when the primary pressure becomes the second pressure while the valve body is closed. As a result, the pressurized gas supplied to the secondary side pipe can be circulated through the communication port while lowering the primary pressure due to the pressurized gas in the secondary side pipe at all times, and the secondary side can be circulated. The pressurized gas can be easily filled in the pipe, and the pressure inside the pipe can be easily maintained at the first pressure. Further, when the primary pressure becomes the secondary pressure while the valve body is closed, the communication port is closed, so that the alarm valve is erroneously opened when the secondary sprinkler head is not open. In such a case, even if the fire extinguishing water flows into the primary side of the open valve, it can be prevented from flowing to the secondary side.

Further, in the present invention, the open valve is an intermediate chamber provided in the seat portion on which the valve body is seated, and when the valve body is seated, an opening facing the peripheral portion of the primary pressure receiving portion is provided. An intermediate chamber having a communication portion that communicates with the outside of the valve box is provided, and the communication portion always opens the terminal opening to the end opening on the outside side of the valve box to open the intermediate chamber to the atmosphere. By assuming that an air vent valve for closing the end opening is provided when the valve body is opened and the fire extinguishing water of the second pressure flows in, a predetermined value is generated between the primary side and the secondary side. The valve body can be opened and closed based on the design differential pressure, and when the valve body is opened, it is possible to prevent the fire extinguishing water flowing into the intermediate chamber from being discharged to the outside through the terminal opening.

In the conventional dry or pre-actuated sprinkler fire extinguishing equipment, when the alarm valve is erroneously opened, it is complicated to drain the fire extinguishing water that has flowed to multiple branch pipes when the equipment is restored. There was a problem that it was not easy. In addition, when the alarm valve is normally opened due to a fire, fire extinguishing water flows to all of the multiple branch pipes, so the branch pipe to which the opened sprinkler head is connected is located at the end. There is a problem that it takes time for the branch pipe to be filled with water, and the start of water discharge from the opened sprinkler head is delayed. Furthermore, due to the equipment design, all of the multiple branch pipes are filled with water within 1 minute from the opening operation of the sprinkler head due to a fire, and even if it is delayed, water is discharged within 1 minute from the opening operation. However, there was a problem that the equipment cost was high because a large-capacity fire extinguishing pump had to be used as a fire extinguishing pump for pumping fire extinguishing water.

In the present invention, when the alarm valve is opened and the primary side pressure becomes the second pressure, the secondary side sprinkler head is not opened and the secondary side pressure becomes the first pressure. When held, it does not open with the magnitude of the differential pressure generated between the primary and secondary sides, while it opens when the alarm valve opens and the primary pressure becomes the secondary pressure. When the side sprinkler head is opened and the secondary side pressure drops to atmospheric pressure, it shall be released by the differential pressure of the magnitude generated between the primary side and the secondary side. By providing it on each base end side of the branch pipe, it is possible to selectively allow the fire extinguishing water to flow into the branch pipe provided with the opened sprinkler head. As a result, even if the alarm valve is accidentally opened, as long as the sprinkler head is not open, the fire extinguishing water does not flow into multiple branch pipes, making it easy to drain water from the pipes when the equipment is restored. can do. Further, in the event of a fire, the fire extinguishing water will flow only into the branch pipe in which the sprinkler head is opened, out of the plurality of branch pipes, and the time required for filling the branch pipe can be shortened. It is possible to accelerate the start of water discharge from the sprinkler head.

Further, in the present invention, the release valve is also provided at a position near the alarm valve in the secondary main pipe, so that even if the alarm valve is erroneously opened, as long as the sprinkler head is not opened. , The fire extinguishing water can flow up to the open valve provided at the position near the alarm valve, and the work of draining water from the pipe at the time of equipment restoration can be further facilitated. The alarm valve may be provided with a drain valve, and the drainage operation can be performed by opening the drain valve provided on the alarm valve.

Further, in the present invention, the secondary side main is the secondary side main main connected to the secondary side of the alarm valve, and a plurality of secondary side branch mains branching from the secondary side main main. By providing an open valve on the proximal end side of each of the plurality of secondary branch mains, the sprinkler head includes the inside of the plurality of secondary branch mains. The fire extinguishing water can be selectively flowed into the opened branch pipe. That is, even if the alarm valve is erroneously opened, the work of draining water from the pipe can be facilitated, and in the event of a fire, the time required for filling the branch pipe in which the sprinkler head is opened can be shortened. , The start of water discharge from the opened sprinkler head can be accelerated.

Further, in the present invention, the open valve is formed so that the pressure receiving area of the secondary side pressure receiving portion is larger than the pressure receiving area of the primary side pressure receiving portion by a predetermined ratio. By controlling the opening / closing operation, the open valve has a simple structure, but as described above, the fire extinguishing water is selectively directed into the branch pipe provided with the open-operated sprinkler head. It can be controlled to flow.

It is a piping system diagram which showed an example of embodiment of the sprinkler fire extinguishing equipment of this invention, and shows a constant monitoring state. It is a piping system diagram of the same as above, and shows the operating state at the time of a fire. The above piping system diagram shows the state when the alarm valve is erroneously opened. It is sectional drawing which showed an example of the open valve used for the above-mentioned sprinkler fire extinguishing equipment, (a) is a constant monitoring state, (b) is a state when an alarm valve is erroneously opened, (c) is operation at the time of a fire. Each state is shown.

An embodiment of the sprinkler fire extinguishing system of the present invention will be described with reference to FIGS. 1 to 4. The sprinkler fire extinguishing equipment of the present invention can be applied to dry-type equipment or pre-actuated equipment in which the secondary side piping of the alarm valve is constantly filled with pressurized gas. 1 to 3 are piping system diagrams schematically showing an example of the piping system in the sprinkler fire extinguishing equipment of the present invention, but the equipment configuration corresponds to the case of using a dry type equipment. Of course, it also supports the case of pre-actuated equipment equipped with a fire detector and the like separately.
Further, the open valve shown in FIG. 4 also corresponds to the case where the equipment is a dry type equipment and the case where the equipment is a pre-actuated type equipment separately equipped with a fire detector or the like.

In FIGS. 1 to 3, the sprinkler fire extinguishing equipment 1 has an alarm valve 2 that is normally closed and a warning valve 2.
The primary side pipe 3 located on the primary side of the alarm valve 2 and the secondary side pipe 4 located on the secondary side of the alarm valve 2.
And have. The terminal side of the primary side pipe 3 is connected to the primary side of the alarm valve 2, and a fire extinguishing pump P for pumping fire extinguishing water from a water supply source (not shown) is connected to the base end side. Further, in the secondary side pipe 4, the secondary side main pipe 5 whose base end side is connected to the secondary side of the alarm valve 2
And a plurality of sprinkler branch pipes (an example of a plurality of branch pipes) 6 to which a plurality of sprinkler heads 7 are connected to each branch from the secondary side main pipe 5 toward each protected area. ..

FIG. 1 shows a constant monitoring state. As shown in the figure, in the constant monitoring state, the inside of the primary side pipe 3 is filled with fire extinguishing water pressurized and supplied by the fire extinguishing pump P (the filled portion is filled in and shown. ), The pressure inside the pipe, the control means for starting / stopping the fire extinguishing pump P (all not shown), etc., hold the pressure at a predetermined pressure (hereinafter, also referred to as “primary monitoring pressure”). Further, the inside of the secondary side pipe 4 is filled with the pressurized gas supplied under pressure by the compressor CP, which is an example of the pressurized gas introducing means, up to the sprinkler head 7 at the end, and the inside of the primary side pipe 3 Similarly, it is held at a predetermined pressure (an example of the first pressure, hereinafter also referred to as "secondary monitoring pressure") by the pipe pressure monitoring means and the compressor CP start / stop control means (both are not shown). Will be done.

Then, in the sprinkler fire extinguishing equipment 1, when the alarm valve 2 is opened, the water supply pressure at which the fire extinguishing water is higher than the secondary side monitoring pressure through the alarm valve 2 (an example of the second pressure, hereinafter "secondary side". Water supply pressure "
Also called. ) Is controlled and supplied into the secondary side pipe 4. Further, when the primary side pressure and the secondary side pressure are held at the same pressure on the base end side of each of the plurality of sprinkler branch pipes 6, they are closed, while the primary side pressure is the secondary side pressure. It is assumed that an open valve K that opens when a differential pressure of a predetermined size is generated between the primary side and the secondary side when the pressure becomes higher than that of the primary side is provided. Specifically, in the release valve K, when the alarm valve 2 is opened and the primary side pressure becomes the secondary side water supply pressure, the secondary side sprinkler head 7 is not opened and the secondary side pressure is reached. Is held at the secondary side monitoring pressure, it will not be released by the differential pressure of the magnitude generated between the primary side and the secondary side, while the alarm valve 2 will be opened and the primary side pressure will be secondary. When it comes to side water pressure
When the secondary side sprinkler head 7 is opened and the secondary side pressure drops to atmospheric pressure, it is assumed that the secondary side pressure is released by the differential pressure generated between the primary side and the secondary side. There is.

That is, in the sprinkler fire extinguishing equipment 1, when the alarm valve 2 is opened, the fire extinguishing water is selectively flowed into the sprinkler branch pipe 6 in which the sprinkler head 7 is opened by the release valve K.

As a result, in the sprinkler fire extinguishing equipment 1, even if the alarm valve 2 is erroneously opened, the fire extinguishing water does not flow into the plurality of sprinkler branch pipes 6 unless all the sprinkler heads 7 are opened. It is possible to facilitate the work of draining water from the piping during restoration. Further, in the event of a fire, the fire extinguishing water flows only into the sprinkler branch pipe 6 in which the sprinkler head 7 is opened, out of the plurality of sprinkler branch pipes 6, and the time required for filling the sprinkler branch pipe 6 is reached. Can be shortened, and the start of water discharge from the opened sprinkler head 7 can be accelerated.

Here, the release valve K may be provided only on the base end side of each of the plurality of sprinkler pipes 6, but in the case of the present embodiment, the secondary side main pipe 5 is provided on the secondary side of the alarm valve 2. It consists of a secondary side main main 5'connected to the secondary side main main 5'and a plurality of secondary side branch mains 5'' that branch from the secondary side main main 5'to each sprinkler branch pipe 6. As a result, a plurality of sprinkler branch pipes 6 are branched from the plurality of secondary side branch mains 5'', and the secondary side main mains 5 are used.
It is assumed that the same open valve K as described above is provided in', and the same open valve K as described above is also provided on the proximal end side of each of the plurality of secondary branch mains 5''. There is. note that,
The compressor CP, which is an example of the pressurized gas introducing means, is located on the upstream side of the open valve K provided in the secondary side main main pipe 5'located on the most upstream side on the secondary side of the alarm valve 2, for example. It is assumed that they are connected via an orifice.

That is, in the case of the present embodiment, the sprinkler fire extinguishing equipment 1 is used when the alarm valve 2 is opened.
By the open valve K, fire extinguishing water is selectively extinguished toward the inside of the sprinkler branch pipe 6 in which the sprinkler head 7 is opened, including the inside of the secondary side main main 5'and a plurality of secondary side branch mains 5'. Is supposed to flow.

In this sprinkler fire extinguishing equipment 1, when the alarm valve 2 is opened, the open valve K allows the fire extinguishing water to selectively flow into the sprinkler branch pipe 6 in which the sprinkler head 7 is opened. As described above, in the event of a fire, the fire extinguishing water will flow only into the sprinkler branch pipe 6 in which the sprinkler head 7 is opened, out of the plurality of sprinkler branch pipes 6, but the plurality of secondary branch pipes By doing so, including the inside of the pipe 5'', in the event of a fire, the sprinkler head 7 of the plurality of sprinkler branch pipes 6 including the inside of the plurality of secondary side branch mains 5'' The fire extinguishing water will flow only into the opened sprinkler branch pipe 6.

Specifically, in the case of the present embodiment, when any of the sprinkler heads 7 in the protected area where the fire occurred is opened in the event of a fire, first, the sprinkler head 7 that has been opened is started from the sprinkler head 7. The pressurized gas in the sprinkler branch pipe 6 having the head 7 is discharged to the outside, and the pressure in the pipe drops to the atmospheric pressure. As the pressure inside the sprinkler branch pipe 6 decreases, the open valve K on the proximal end side opens, and the pressurized gas inside the secondary branch main 5'' on the upstream side is released to the outside. The pressure inside the pipe drops to atmospheric pressure, and the pressurized gas is sequentially released to the outside to the inside of the main main pipe 5'on the secondary side connected to the alarm valve 2 on the upstream side, and the pressure inside the pipe is reduced. It drops to atmospheric pressure. On the other hand, in any of the other sprinkler branch pipes 6 without the sprinkler head 7 opened, the pressure inside the pipe does not decrease, and the secondary monitoring pressure is maintained. Further, in any of the secondary side branch mains 5 ″ where the sprinkler branch pipe 6 having the opened sprinkler head 7 is not on the downstream side, the pressure inside the pipe does not decrease and is maintained at the secondary side monitoring pressure.

As a result, when the alarm valve 2 is opened, the fire extinguishing water flowing in the secondary side pipe 4 is directed toward the inside of the sprinkler branch pipe 6 in which the sprinkler head 7 is opened and the pipe pressure is lowered to the atmospheric pressure. Including the inside of the secondary side branch main 5'' and the inside of the secondary side main main 5'located on the upstream side,
The open valve K provided in these pipes is opened by the secondary side water supply pressure, and the fire extinguishing water flows over the open valve K, while the sprinkler head 7 is not open and the secondary side is not operated. For other sprinkler branch pipes 6 in which the side monitoring pressure is maintained, including the inside of the secondary side branch main 5'' where the sprinkler branch pipe 6 with the sprinkler head 7 opened is not on the downstream side. The open valve K provided in these pipes does not open and does not flow beyond the open valve K. That is, among the plurality of sprinkler branch pipes 6 including the inside of the secondary side main main 5'to the plurality of secondary side branch mains 5'', the sprinkler branch pipe 6 in which the sprinkler head 7 is opened is operated. Fire extinguishing water will flow only toward.

FIG. 2 shows the operating state at the time of a fire, and shows the flow of fire extinguishing water toward the sprinkler head 7 when the alarm valve 2 is opened (the flowing water portion is shaded). It is shown as.). In the case of the present embodiment, for example, the sprinkler head 7 among the plurality of sprinkler branch pipes 6 flows through a plurality of secondary side branch mains 5'' by a selective route as shown in FIG. The fire extinguishing water will flow only into the sprinkler branch pipe 6 which has been opened.

In the sprinkler fire extinguishing equipment 1, as described above, in the event of a fire, the fire extinguishing water is made to flow only into the sprinkler branch pipe 6 in which the sprinkler head 7 is opened, out of the plurality of sprinkler branch pipes 6. Therefore, the time required for filling the water in the sprinkler branch pipe 6 can be shortened, and the start of water discharge from the opened sprinkler head 7 can be accelerated, as in the present embodiment. , From the secondary side main main 5'to the inside of the plurality of secondary side branch mains 5'', among the plurality of sprinkler branch pipes 6, toward the inside of the sprinkler branch pipe 6 in which the sprinkler head 7 is opened. Since the fire extinguishing water flows only, the time required for filling the sprinkler branch pipe 6 is shorter than the case where the open valve K is provided only in the plurality of sprinkler branch pipes 6. And the start of water discharge from the opened sprinkler head 7 can be made even faster.

Further, the sprinkler fire extinguishing equipment 1 selectively allows fire extinguishing water to flow into the sprinkler branch pipe 6 in which the sprinkler head 7 is opened when the alarm valve 2 is opened, as described above. Even if the alarm valve 2 is erroneously opened, if none of the sprinkler heads 7 is open, the fire extinguishing water will not flow into the plurality of sprinkler branch pipes 6, but as in the present embodiment, The open valve K is also provided in the secondary side main main pipe 5'located on the most upstream side of the secondary side main pipe 5 and connected to the secondary side of the alarm valve 2, so that the valve K can be provided in the first place. The fire extinguishing water will not flow beyond the open valve K provided on the secondary side main main pipe 5'.

Specifically, in the case of the present embodiment, if none of the sprinkler heads 7 is open, the secondary side monitoring pressure is maintained in each of the plurality of sprinkler branch pipes 6, thereby a plurality of secondary. The secondary side monitoring pressure is maintained both in the side branch main 5'' and in the secondary main main 5'. As a result, even if the alarm valve 2 is erroneously opened and fire extinguishing water is supplied to the secondary side, if none of the sprinkler heads 7 is open, it is connected to the secondary side of the alarm valve 2 and the second The open valve K provided in the secondary main main pipe 5'located on the most upstream side of the secondary main main 5 does not open, and fire extinguishing water flows to the secondary side beyond the open valve K. No fire extinguishing water flows into any of the plurality of secondary side branch mains 5'', and no fire extinguishing water flows into any of the plurality of sprinkler branch pipes 6.

FIG. 3 shows a state when the alarm valve 2 is erroneously opened at the time of non-fire, and shows a state where the flow of fire extinguishing water is blocked by the release valve K (the inflow portion is filled in). It is shown.). According to the present embodiment, even if the alarm valve 2 is erroneously opened and fire extinguishing water is supplied to the secondary side, if none of the sprinkler heads 7 is open, as shown in FIG.
The secondary side main main 5 which is connected to the secondary side of the alarm valve 2 and is located on the most upstream side in the secondary side main main 5.
The fire extinguishing water flows only up to the open valve K provided in', and the fire extinguishing water does not flow in any of the plurality of secondary side branch mains 5'', and in any of the plurality of sprinkler branch pipes 6. Fire extinguishing water does not flow.

In this sprinkler fire extinguishing equipment 1, as described above, even if the alarm valve 2 is erroneously opened, as long as none of the sprinkler heads 7 is open, a plurality of sprinkler branch pipes 6 are used.
It is possible to facilitate the work of draining water from the pipes when restoring the equipment without the fire extinguishing water flowing to the inside, but as in the present embodiment, if none of the sprinkler heads 7 is open. , Fire extinguishing water on the secondary side of the open valve K connected to the secondary side of the alarm valve 2 and provided on the secondary side main main 5'located on the most upstream side of the secondary main main 5. Even if the alarm valve 2 is erroneously opened and the fire extinguishing water is supplied to the secondary side main pipe 5, the fire extinguishing water flows to the secondary side main main pipe 5'. It can be up to the position of the open valve K provided, and compared to the case where the open valve K is not provided on the secondary side main main pipe 5', drainage of water from the piping at the time of equipment restoration is performed. The work can be made easier.

Here, a specific example of the open valve K that opens and closes as described above will be described in detail with reference to FIG.

As the open valve K, for example, as shown in FIGS. 4A to 4C, a swing type on-off valve provided with a valve body 12 that opens and closes a flow path by swinging into the valve box 11. Can be used.

In this open valve K, the valve body 12 has a primary side pressure receiving portion 12a and a secondary side pressure receiving portion 12b that face perpendicularly to the flow path in a state where the flow path is closed. The primary side pressure receiving portion 12a and the secondary side pressure receiving portion 12b are formed so that the pressure receiving area of the secondary side pressure receiving portion 12b is larger, and the primary side pressure and the secondary side pressure are held at the same pressure. At that time, it is assumed that the valve body 12 is closed.

FIG. 4A shows a constant monitoring state, that is, a state when both the primary side pressure and the secondary side pressure are held by the secondary side monitoring pressure. be. As shown in the figure, in this state, the open valve K is maintained in the closed state due to the difference in the pressure receiving area between the primary side pressure receiving portion 12a and the secondary side pressure receiving portion 12b.

Further, the primary side pressure receiving portion 12a and the secondary side pressure receiving portion 12b are not only formed so that the pressure receiving area of the secondary side pressure receiving portion 12b is larger, but also the secondary side pressure receiving portion is formed in a predetermined ratio. 12b
The pressure receiving area is formed to be larger, and due to the difference in the size of the pressure receiving area of the predetermined ratio, when the primary side pressure becomes higher than the secondary side pressure, the primary side and the secondary side The valve body 12 is opened by the generation of a differential pressure of a predetermined size between the two. If you turn it over,
Even if the primary side pressure is higher than the secondary side pressure, the valve body 12 will not open if the differential pressure is less than a predetermined pressure. Specifically, when the alarm valve 2 is opened and the primary side pressure becomes the secondary side water supply pressure, the secondary side sprinkler head 7 is not open and the secondary side pressure is monitored by the secondary side. When held in pressure, the differential pressure of the magnitude generated between the primary side and the secondary side does not open the valve body 12, while the alarm valve 2 opens and the primary side pressure is on the secondary side. When the water supply pressure is reached, the secondary side sprinkler head 7 is opened, and when the secondary side pressure drops to atmospheric pressure, the magnitude generated between the primary side and the secondary side is large. The valve body 12 is opened by the differential pressure.

FIG. 4B shows a state when the alarm valve 2 is erroneously opened, that is, fire extinguishing water flows into the primary side of the valve body 12 of the release valve K, and the primary side pressure is on the secondary side. While the water supply pressure is high (
The inflow part is shown with diagonal lines. ), The state when the secondary side sprinkler head 7 is not operating and the secondary side pressure of the valve body 12 is held by the secondary side monitoring pressure is shown. As shown in the figure, in this state, even if the primary side pressure is the secondary side water supply pressure, the open valve K has a large or small pressure receiving area of the primary side pressure receiving portion 12a and the secondary side pressure receiving portion 12b. The closed state will be maintained due to the difference.

FIG. 4C shows a state at the time of a fire, that is, the alarm valve 2 is opened and the secondary sprinkler head 7 is opened, whereby the valve body 12 of the open valve K is opened. The valve body 12 opens due to the difference pressure between the primary side pressure, which is the secondary side water supply pressure when the fire extinguishing water flows into the primary side, and the secondary side pressure, which is the atmospheric pressure after the pressurized gas is released. It shows the state when the fire extinguishing water is flowing from the primary side to the secondary side (the flowing water part is shown with a diagonal line). As shown in the figure, in this state, the open valve K is between the primary side and the secondary side even if there is a difference in the pressure receiving area between the primary side pressure receiving portion 12a and the secondary side pressure receiving portion 12b. The valve body 12 is opened by the differential pressure (more than a predetermined value) generated in the above, and the fire extinguishing water flows from the primary side to the secondary side.

By using such an open valve K, in the sprinkler fire extinguishing equipment 1, as described above, when the alarm valve 2 is opened, the fire is selectively extinguished toward the inside of the sprinkler branch pipe 6 in which the sprinkler head 7 is opened. Water can be allowed to flow.

Here, in the case of the example shown in FIG. 4, the open valve K penetrates between the primary side pressure receiving portion 12a and the secondary side pressure receiving portion 12b of the valve body 12 and communicates between the primary side and the secondary side. It is assumed that the communication port 12c is provided, and the communication port 12c is always open to the communication port 12c (FIG. 4A).
When the primary side pressure becomes the secondary side water supply pressure while the valve body 12 is closed, the communication port 12c is closed (FIG. 4B), and the auxiliary valve 13 is provided. Such a communication port 1
By using the open valve K having 2c or the like, while lowering the secondary side monitoring pressure due to the pressurized gas in the secondary side pipe 4 at all times, in the normal monitoring state shown in FIG. 4 (a), two The pressurized gas supplied into the secondary side pipe 4 can be circulated through the communication port 12c, the pressurized gas can be easily filled in the secondary side pipe 4, and the pressure inside the pipe can be easily applied. It can be maintained at the secondary monitoring pressure. Further, in the state when the alarm valve 2 shown in FIG. 4B is erroneously opened,
Since the communication port 12c is closed, even if the alarm valve 2 is erroneously opened and the fire extinguishing water flows into the primary side of the opening valve K, it can be prevented from flowing to the secondary side. The auxiliary valve 13 has, for example, a spherical valve body 13a as shown in the figure, and the valve body 1 is always present.
While 3a is positioned at the open position of the communication port 12c, when the secondary side water supply pressure acts on the valve body 13a, the elasticity of the coil spring or the like that shrinks and positions the valve body 13a at the closed position of the communication port 12c. A member having a member 13b can be used.

Further, in the open valve K, when a pressure leak occurs between the valve body 12 and the seat portion 12d on which the valve body 12 is seated, the valve body 12 is closed and maintained by a predetermined design differential pressure between the primary side and the secondary side. You will not be able to. In order to prevent the pressure from leaking, the release valve K has an annular and double sealing portion 12e as a sealing portion for sealing between the valve body 12 and the seat portion 12d at the position of the seat portion 12d on which the valve body 12 is seated. , 12f are provided (see FIG. 4 (c)). When the seal portion is made single, there is a possibility that the valve body 12 cannot be kept closed due to a predetermined design differential pressure between the primary side and the secondary side due to the occurrence of seal leakage. By using the double seal portions 12e and 12f as the seal portions, the sealing performance is improved, but the double seal portions 12 are simply used.
If only e and 12f are used, there is no escape for pressure between the two sealing portions 12e and 12f, so that the valve body 12 can be similarly closed and maintained by a predetermined design differential pressure between the primary side and the secondary side. It may disappear. Therefore, the release valve K has both seal portions 12e and 12f of the seat portion 12d.
An intermediate chamber having an annular opening 14a facing the peripheral portion of the primary side pressure receiving portion 12a and a communication portion 14b communicating with the outside of the valve box 11 when the valve body 12 is seated at a position between them. 14 is provided, and the communication portion 14b is always open to the terminal opening 14c on the outer side of the valve box 11 to open the intermediate chamber 14 to the atmosphere (FIG. 4). (See (a) and (b)), when the valve body 12 opens and the fire extinguishing water of the secondary side water supply pressure flows in, the end opening 14c is closed (see FIG. 4 (c)). It is supposed to be.
By using the open valve K provided with the intermediate chamber 14 and the like, when the valve body 12 is seated on the seat portion 12d and is in the closed state, the double seal portions 12e and 12f are used to the outside. When the valve body 12 is opened and the fire extinguishing water flows in, it is possible to prevent the fire extinguishing water from being discharged to the outside while ensuring a place for the pressure to escape. That is, the valve body 12 can be opened and closed based on a predetermined design differential pressure generated between the primary side and the secondary side, and when the valve body 12 is opened, the fire extinguishing flowing into the intermediate chamber 14 is extinguished. It is possible to prevent water from being discharged to the outside through the terminal opening 14c. The air vent valve 15 has, for example, a spherical valve body 15a as shown in FIG. 4, and the valve body 15a is always positioned at the open position of the end opening 14c, while the valve body 15a has two. When the water supply pressure on the next side acts, it shrinks and opens the valve body 15a at the end opening 1.
Those having an elastic member 15b such as a coil spring positioned at the closed position of 4c can be used.

The sprinkler fire extinguishing equipment 1 will be described in more detail.

As the set values of the secondary side monitoring pressure and the secondary side water supply pressure higher than the secondary side monitoring pressure, for example, when the secondary side monitoring pressure is 0.2 MPa, the secondary side water supply pressure is 0. It can be 5 MPa. The primary monitoring pressure at that time can be, for example, 1 MPa. In addition, in this sprinkler fire extinguishing equipment 1, since the secondary side monitoring pressure can be lowered, in terms of equipment design,
The withstand voltage performance of the secondary side piping 4 and the like can be lowered, and the equipment cost can be reduced.

As the alarm valve 2, a valve with a secondary pressure adjusting function can be used, whereby the supply pressure of the fire extinguishing water that flows out to the secondary side of the alarm valve 2 and is supplied into the secondary side pipe 4 can be adjusted. It can be controlled to a predetermined pressure (secondary water supply pressure). Separately, a means for adjusting the supply pressure of the fire extinguishing water supplied in the secondary side pipe 4 may be provided, but the equipment configuration is simplified by providing the alarm valve 2 with a secondary pressure adjusting function. can do.

The gas that is constantly pressurized and filled in the secondary side pipe 4 may be air, but it may also be a gas-based fire extinguishing agent (an inert gas such as nitrogen gas or a halide fire extinguishing agent). moreover,
Instead of the gas, it can be used as a fire extinguisher in a liquid state containing a fluorine-containing ketone.
Specifically, it can be a fire extinguisher in a liquid state containing dodecafluoro-2-methylpentane-3-one. The liquid fire extinguishing agent may be filled in the entire secondary side pipe 4, or may be filled only in a part thereof, for example, in the sprinkler branch pipe 6.

Although an example of the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made.

For example, the open valve K provided in the secondary side main main 5'can be provided at a position in the vicinity of the alarm valve 2. By doing so, it is possible to further facilitate the work of draining water from the piping when the equipment is restored.

Further, the alarm valve 2 may be provided with a drain valve, and the drainage operation can be performed by opening the drain valve provided in the alarm valve 2.

Further, in the above embodiment, the secondary side main main 5 is composed of a plurality of pipes of the secondary side main main 5'and a plurality of secondary side branch mains 5', but it is installed. Alarm valve 2 depending on the location
It may consist of one pipe connected to the secondary side of the above, and a plurality of sprinkler branch pipes 6 may branch from the one pipe.

1: Fire extinguishing equipment 2: Alarm valve 3: Primary side piping 4: Secondary side piping 5: Secondary side main 5': Secondary side main main 5'': Secondary side branch main 6: Sprinkler branch pipe 7: Sprinkler head 11: Valve box 12: Valve body 12a: Primary side pressure receiving part 12b: Secondary side pressure receiving part 12c: Communication port 12d: Seat part 12e, 12f: Seal part 13: Auxiliary valve 13a: Valve body 13b: Elastic Member 14: Intermediate chamber 14a: Opening 14b: Communication part 14c: End opening 15: Air vent valve 15a: Valve body 15b: Elastic member CP: Compressor P: Fire extinguishing pump K: Open valve

Claims (4)

It is located on the secondary side of the alarm valve that is normally closed, has a secondary side main pipe to which the proximal end side is connected to the secondary side of the alarm valve, and branches from the secondary side main pipe. In a sprinkler fire extinguishing facility, each of which is provided with a secondary side pipe having a plurality of branch pipes to which a sprinkler head is connected, and the secondary side pipe is always filled with a pressurized gas and held at the first pressure. ,
It is assumed that the fire extinguishing water is controlled and supplied into the secondary side pipe to a second pressure higher than the first pressure.
The secondary side piping is closed when the primary side pressure and the secondary side pressure are held at the same pressure, while the primary side is closed when the primary side pressure is higher than the secondary side pressure. A sprinkler fire extinguishing system characterized by providing an open valve that opens when a differential pressure of a predetermined size is generated between the surface and the secondary side. In the release valve, when the alarm valve is opened and the primary side pressure becomes the second pressure, the secondary side sprinkler head is not open and the secondary side pressure is held at the first pressure. When the pressure is increased, the differential pressure generated between the primary side and the secondary side does not release the pressure, while the alarm valve opens and the primary pressure becomes the secondary pressure. When the secondary side sprinkler head is opened and the secondary side pressure drops to atmospheric pressure, it is characterized by opening with a differential pressure of the magnitude generated between the primary side and the secondary side. The sprinkler fire extinguishing equipment according to claim 1. The open valve penetrates between the primary side pressure receiving portion and the secondary side pressure receiving portion of the valve body, and is provided with a communication port for communicating the primary side and the secondary side, and the communication port is always provided. Is characterized in that an auxiliary valve for closing the communication port is provided when the primary side pressure becomes the second pressure while the valve body is closed while opening the communication port. The sprinkler fire extinguishing equipment according to item 1 or 2. The open valve is an intermediate chamber provided in the seat portion on which the valve body is seated, and has an opening facing the peripheral portion of the primary pressure receiving portion when the valve body is seated, and is outside the valve box. An intermediate chamber having a communication portion is provided, and the communication portion is always open to the terminal opening on the outer side of the valve box to open the intermediate chamber to the atmosphere, while the valve body. The sprinkler fire extinguishing according to any one of claims 1 to 3, wherein an air vent valve for closing the end opening is provided when the fire extinguishing water of the second pressure flows in. Facility.

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