JP2020156811A - Sprinkler fire extinguishing equipment - Google Patents

Abstract

To provide sprinkler fire extinguishing equipment which prevents leakage of water from secondary side piping by reducing a pressure in the secondary side piping in a monitoring state as much as possible and prevents progress of corrosion.SOLUTION: Sprinkler fire extinguishing equipment 1 according to the present invention includes secondary side piping 7, a water flow detector 9 provided between the secondary side piping 7 and primary side piping 5, a pressure adjustment pilot valve 13 which is provided between a cylinder chamber 11 of the water flow detector 9 and the secondary side piping 7 for adjusting a secondary side pressure, and an exhaust pressure valve 19 which discharges water from the secondary side piping 7 when a pressure in the secondary side piping 7 is equal to a prescribed pressure or higher to adjust in a manner that the pressure in the secondary side piping 7 is less than the prescribed pressure. In the sprinkler fire extinguishing equipment 1, a vacuum open valve 15 is provided between the secondary side piping 7 and the pressure adjustment pilot valve 13, is opened when the pressure in the secondary side piping 7 is reduced in a monitoring state for adjusting in a manner that the pressure in the secondary side piping 7 is equal to a prescribed pressure or higher, and keeps an open state when a closed type sprinkler head 3 is opened.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sprinkler fire extinguishing system, and more particularly to a wet sprinkler fire extinguishing system that fills the secondary side piping of a water flow detection device.

Sprinkler fire extinguishing equipment is installed as fire extinguishing equipment in buildings of a certain size or larger. The sprinkler fire extinguishing equipment is a facility that extinguishes a fire by discharging water from a sprinkler head installed on the ceiling.

There is a type of sprinkler fire extinguishing equipment that fills the secondary side piping of the water flow detection device (hereinafter simply referred to as "secondary side piping") with fire extinguishing water. This type of sprinkler fire extinguishing equipment includes sprinklers. There is a wet type in which the fire is extinguished by a pressure drop in the secondary side pipe due to the opening of the head (see, for example, the conventional technique of Patent Document 1).

In this type, the operating condition is a drop in the pressure inside the secondary side piping, so it is necessary to adjust the pressure inside the secondary side piping within a certain range in the monitoring state, and as a mechanism for that, running water detection A pressure regulating pilot valve is provided between the cylinder chamber of the device and the secondary piping.
Then, in the monitoring state, when the pressure in the secondary side pipe becomes lower than the set pressure of the pressure adjusting pilot valve due to, for example, a very slight water leak, the pressure adjusting pilot valve is slightly opened and filled in the secondary side pipe. Water is applied to recover the pressure (see, for example, the background art of Patent Document 2).

In the event of a fire, when the pressure inside the secondary piping becomes lower than the set pressure of the pressure regulating pilot valve due to the operation of the sprinkler head, the pressure regulating pilot valve opens and the pressurized water in the cylinder chamber is discharged to the secondary piping. Inflow to.
When the flow of pressurized water in the pressure regulating pilot valve exceeds a certain level, the pressure in the cylinder chamber drops and the main valve opens. When the flow rate of the main valve increases and the pressure in the secondary piping approaches the set pressure of the pressure regulating pilot valve, the opening of the pressure regulating pilot valve is narrowed and the pressure in the cylinder chamber of the main valve rises. The opening degree of the valve is narrowed down, and the pressure in the secondary pipe is controlled to a predetermined pressure. As a result, fire extinguishing water is sprinkled from the sprinkler head at a predetermined pressure.

Japanese Unexamined Patent Publication No. 11-4907 JP-A-2009-103254

If the pressure inside the secondary side pipe is high in the monitoring state, corrosion of the pipe is likely to proceed, and even if there is a slight crack in the secondary side pipe, water leakage will occur. Therefore, recently, the set pressure of the pressure regulating pilot valve is adjusted so that the pressure in the secondary side pipe in the monitoring state is as low as possible, for example, about 0.4 MPa.
However, as described above, the set pressure of the pressure regulation pilot valve is related to the pressure control that discharges water from the sprinkler head in the event of a fire, so if the set pressure is further lowered, the sprinkler head will be discharged to the minimum water discharge pressure (0.1 MPa). With the above, the pressure head for discharging water cannot be secured.
Therefore, the pressure inside the secondary side piping in the monitoring state could not be lowered below the above, for example, about 0.4MPa, and it was not possible to meet the demands for preventing water leakage and corrosion progress from the secondary side piping. ..

The present invention has been made to solve such a problem, and in a wet sprinkler fire extinguishing system, the pressure in the secondary side pipe in the monitoring state is made as low as possible to prevent water leakage from the secondary side pipe. The purpose is to provide sprinkler fire extinguishing equipment that can meet the demand for prevention of corrosion progress.

The sprinkler fire extinguishing equipment according to the present invention includes a secondary side pipe provided with a closed sprinkler head and filled with water in a monitoring state, and a water flow detection device provided between the secondary side pipe and the primary side pipe. When the pressure adjusting pilot valve provided between the cylinder chamber of the water flow detection device and the secondary side piping to regulate the secondary side pressure and the pressure in the secondary side piping exceeds a predetermined pressure. In a sprinkler fire extinguishing facility equipped with an exhaust pressure valve that drains water from the secondary side pipe and adjusts the pressure in the secondary side pipe to less than a predetermined pressure.
It is provided between the secondary side pipe and the pressure adjusting pilot valve, and in the monitoring state, it is opened when the pressure in the secondary side pipe drops to raise the pressure of the secondary side pipe to a predetermined pressure or higher. It is characterized by being provided with a pressure reducing release valve that maintains an open state when the pressure is adjusted and the closed type sprinkler head is opened.

In the sprinkler fire extinguishing equipment according to the present invention, it is provided between the secondary side pipe and the pressure adjusting pilot valve, and in the monitoring state, it is opened when the pressure in the secondary side pipe drops, and the secondary side pipe is opened. By adjusting the pressure to a predetermined pressure or higher and providing a decompression release valve that maintains the open state when the closed sprinkler head opens, the pressure setting in the secondary side piping in the monitoring state is adjusted by the pressure adjustment pilot valve. It is possible to set the pressure separately from the set pressure of, and the pressure in the secondary side piping can be set to a very low pressure that can detect pressure fluctuations.
This makes it possible to meet the demands for preventing water leakage from the secondary side piping and preventing the progress of corrosion.

It is explanatory drawing of the whole structure of the sprinkler fire extinguishing equipment which concerns on embodiment of this invention (monitoring state). It is explanatory drawing of the whole structure of the sprinkler fire extinguishing equipment which concerns on embodiment of this invention (pressure drop in a monitoring state). It is explanatory drawing of the whole structure of the sprinkler fire extinguishing equipment which concerns on embodiment of this invention (when a fire breaks out).

As shown in FIG. 1, the sprinkler fire extinguishing equipment 1 according to the present embodiment is provided with a closed sprinkler head 3 (hereinafter, simply referred to as “sprinkler head 3”) and is filled with water in a monitored state. 7 and the water flow detection device 9 provided between the secondary side pipe 7 and the primary side pipe 5, and the secondary side provided between the cylinder chamber 11 of the water flow detection device 9 and the secondary side pipe 7. It is provided with a pressure adjusting pilot valve 13 for adjusting the pressure, and is provided between the secondary side pipe 7 and the pressure adjusting pilot valve 13, and the pressure in the secondary side pipe 7 drops in the monitoring state. When the closed type sprinkler head 3 is opened, the pressure reducing release valve 15 is provided to maintain the open state when the pressure of the secondary side pipe 7 is adjusted to a predetermined pressure or higher.
Hereinafter, the main configuration and the equipment associated with the configuration will be described.

<Primary side piping, secondary side piping>
The primary side pipe 5 is provided on the primary side of the water flow detection device 9, and is connected to a water supply main which is not shown.
The secondary side pipe 7 is provided on the secondary side of the water flow detection device 9, and forms a part of a water supply pipe that supplies fire extinguishing water to the sprinkler head 3 in the event of a fire.
In the monitoring state, the secondary side pipe 7 is constantly filled with fire extinguishing water at a predetermined pressure. The reason why the fire extinguishing water filled in the secondary side pipe 7 is adjusted to a predetermined pressure is to detect the opening of the sprinkler head 3 by detecting the decrease in the pressure in the secondary side pipe 7. is there.
The pressure adjustment in the secondary side pipe 7 is performed by the exhaust pressure valve 19 and the decompression release valve 15 provided in the drain pipe 17 communicating with the secondary side pipe 7. The pressure adjusting method in the secondary side pipe 7 will be described later.

<Water flow detection device>
The water flow detection device 9 is provided between the secondary side pipe 7 and the primary side pipe 5, and supplies fire extinguishing water to the secondary side pipe 7 by communicating the primary side and the secondary side when the sprinkler head 3 is opened. It also has the function of transmitting a running water signal.
The structure of the water flow detection device 9 having such a function is outlined. As shown in FIG. 1, the inside of the valve box 21 is a cylinder chamber 11 in which a disc 23 having a function as a valve body is installed, and a primary side pipe. It is divided into a primary chamber 25 communicating with 5 and a secondary chamber 27 communicating with the secondary side pipe 7. The disc 23 is configured to be slidable along the inner wall of the cylinder chamber 11, and when opened, the limit switch 29 is operated to transmit a running water signal.
One end side is connected to the cylinder chamber 11, the other end side is connected to the primary chamber 25, and a communication pipe 31 that communicates the cylinder chamber 11 and the primary chamber 25 is provided. The communication pipe 31 is connected from the primary chamber 25 to the cylinder chamber 11. A check valve 33 that allows only flow is installed.

<Pressure control pilot valve>
The pressure adjusting pilot valve 13 is provided between the cylinder chamber 11 of the water flow detection device 9 and the secondary side pipe 7, and has a function of adjusting the secondary side pressure of the pressure adjusting pilot valve 13 (water flow detection device 9). are doing.
A pressure regulating secondary side pipe 35 communicating with the secondary side pipe 7 is provided on the secondary side of the pressure regulating pilot valve 13, and a pressure reducing release valve 15 is provided on the pressure regulating secondary side pipe 35. Has been done.
When the decompression release valve 15 is closed, the secondary side of the pressure adjusting pilot valve 13 and the secondary side pipe 7 do not communicate with each other, and the pressure adjusting pilot valve 13 is affected by the pressure in the secondary side pipe 7. I do not receive it.

<Decompression release valve>
The pressure reducing release valve 15 is provided in the pressure adjusting secondary side pipe 35 so that the secondary side of the pressure adjusting pilot valve 13 is not affected by the pressure of the secondary side pipe 7, in other words, the pressure adjusting pilot valve. It has a function of cutting the edge between the secondary side of 13 and the secondary side pipe 7. Then, in the monitoring state, the pressure in the secondary side pipe 7 can be maintained at a pressure lower than the secondary side pressure of the pressure adjusting pilot valve 13, and when the sprinkler head 3 is opened, the pressure is opened.

As shown in the enlarged view of FIG. 1, the pressure reducing release valve 15 having such a function is connected to the primary side connecting portion 37 connected to the pressure adjusting secondary side pipe 35 and the secondary side pipe 7 to be the secondary side. A casing 41 having a secondary side connecting portion 39 to be communicated with, a valve body 43 disposed in the casing 41 and movably provided between the primary side connecting portion 37 and the secondary side connecting portion 39, and a valve. An urging means 45 such as a spring that constantly urges the body 43 toward the primary side connecting portion 37, and a stopper mechanism 47 that maintains the valve body 43 in an open state when the valve body 43 is opened to a predetermined opening degree or more. And have. The stopper mechanism 47 is provided by a valve rod 49 provided in the valve body 43 through the casing 41, a recess 49a provided in the valve rod 49, and a locking portion 51 provided in the casing 41 and locked in the recess 49a. It is configured.
Inside the casing 41, a seal portion 53 is provided to ensure that the movement of the fire extinguishing water is stopped when the valve body 43 is closed.

The set pressure of the pressure reducing release valve 15 is set to be lower than the set pressure of the pressure adjusting pilot valve 13. For example, when the set pressure of the pressure adjusting pilot valve 13 is 0.4 MPa, the set pressure of the pressure reducing release valve 15 is set to 0.03 MPa. By setting in this way, the pressure in the secondary side pipe 7 can be made lower than the secondary side pressure of the pressure regulating pilot valve 13.

The operation of the present embodiment configured as described above will be described separately for the monitoring state and the time of fire.

<Monitoring status>
In the monitoring state, the disc 23 is in the closed state, but the pressure in the secondary side pipe 7 is constantly adjusted to a constant pressure by the exhaust pressure valve 19 and the decompression release valve 15 (see FIG. 1).
That is, when the pressure in the secondary side pipe 7 rises above a predetermined pressure due to a temperature rise or the like, the exhaust pressure valve 19 is opened and drained from the drain pipe 17, and the pressure in the secondary side pipe 7 is reduced. Decrease.
In the present embodiment, since the decompression release valve 15 is provided between the secondary side pipe 7 and the pressure adjusting pilot valve 13, the set pressure of the exhaust pressure valve 19 is set to the set pressure of the pressure adjusting pilot valve 13. It can be separated and set as low as possible.

In the monitoring state, for example, when the pressure in the secondary side pipe 7 drops below the predetermined pressure due to water leakage in the secondary side pipe 7, for example, the pressure on the secondary side of the decompression release valve 15 (of the decompression release valve 15) When the primary side pressure is less than −0.37 MPa), for example, less than 0.03 MPa, the pressure reducing release valve 15 is slightly opened to fill the secondary side as shown in FIG. As a result, the pressure in the secondary side pipe 7 is restored.

When the set pressure of the pressure regulating pilot valve 13 is 0.4 MPa, the set pressure of the decompression release valve 15 is 0.03 MPa, and the set pressure of the exhaust pressure valve 19 is 0.05 MPa, the pressure state in the monitoring state is illustrated as an example of the pressure regulating pilot valve 13. Primary side pressure (pressure in primary side pipe 5): 0.5MPa to 1.4MPa, pressure adjustment Pressure in secondary side pipe 35: 0.4MPa, pressure in secondary side pipe 7: 0.03MPa to 0.05MPa ..

<In case of fire>
When a fire breaks out, the sprinkler head 3 opens, and the pressure in the secondary side pipe 7 drops, the pressure reducing release valve 15 fully opens (see FIG. 3). When the pressure reducing release valve 15 is fully opened, as shown in FIG. 3, the locking portion 51 is locked in the recess 49a of the valve rod 49 to regulate the movement of the valve rod 49, so that the valve body 43 is maintained in the fully opened state. ..
When the decompression release valve 15 is opened, the secondary side pipe 7 and the pressure adjusting secondary side pipe 35 communicate with each other, and the pressure in the secondary side pipe 7 is adjusted by the pressure adjusting pilot valve 13 to, for example, 0.4 MPa. Water is discharged from the open sprinkler head 3.

As described above, in the sprinkler fire extinguishing equipment 1 according to the present embodiment, the pressure in the secondary side pipe 7 is reduced in the monitoring state because it is provided between the secondary side pipe 7 and the pressure adjusting pilot valve 13. When the closed type sprinkler head 3 is opened, the pressure of the secondary side pipe 7 is adjusted to a predetermined pressure or more, and when the closed type sprinkler head 3 is opened, a pressure reducing release valve 15 is provided to maintain the open state. It is possible to set the pressure inside the secondary side pipe 7 separately from the set pressure of the pressure regulating pilot valve 13, and the pressure inside the secondary side pipe 7 is extremely low enough to detect pressure fluctuations. Can be set to.
As a result, it is possible to meet the demands for preventing water leakage from the secondary side pipe 7 and preventing the progress of corrosion.
Further, even if water leaks from the secondary side pipe 7 in the existing equipment, as shown in the present embodiment, the pressure reducing release valve 15 is on the secondary side of the pressure adjusting pilot valve 13. If the equipment is modified so as to provide the above, water leakage from the secondary side pipe 7 and the progress of corrosion can be prevented.

1 Sprinkler fire extinguishing equipment 3 Closed sprinkler head 5 Primary side piping 7 Secondary side piping 9 Flow detection device 11 Cylinder chamber 13 Pressure regulation pilot valve 15 Decompression open valve 17 Drainage pipe 19 Exhaust pressure valve 21 Valve box 23 Disc 25 Primary chamber 27 Next chamber 29 Limit switch 31 Communication pipe 33 Check valve 35 Pressure regulation Secondary side piping 37 Primary side connection part 39 Secondary side connection part 41 Casing 43 Valve body 45 Biasing means 47 Stopper mechanism 49 Valve rod 49a Recession 51 Locking Part 53 Seal part

Claims (1)

A secondary side pipe provided with a closed sprinkler head and filled with water in a monitoring state, a water flow detection device provided between the secondary side pipe and the primary side pipe, and a cylinder chamber of the water flow detection device. A pressure adjusting pilot valve provided between the secondary side piping and adjusting the secondary side pressure, and draining water from the secondary side piping when the pressure in the secondary side piping exceeds a predetermined pressure. In a sprinkler fire extinguishing facility equipped with an exhaust pressure valve that adjusts the pressure in the secondary side piping to less than a predetermined pressure.
It is provided between the secondary side pipe and the pressure adjusting pilot valve, and is opened when the pressure in the secondary side pipe drops in the monitoring state to raise the pressure of the secondary side pipe to a predetermined pressure or higher. A sprinkler fire extinguishing system characterized in that it is provided with a pressure reducing release valve that maintains an open state when the pressure is adjusted and the closed sprinkler head is opened.

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