JP3208455B2 - Sprinkler fire extinguishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sprinkler fire extinguishing system.

[0002]

2. Description of the Related Art Sprinkler fire extinguishing systems have conventionally used various systems such as open and closed wet and dry systems. In closed sprinkler fire extinguishing equipment, pressurized fire extinguishing liquid is always filled up to the end of the closed sprinkler head provided in each caution area, and it is possible to take water spray operation at the same time as fire detection, the most common This is equipment used for typical buildings. This closed-type sprinkler fire extinguishing system is characterized in that since the fire extinguishing liquid pressurized up to the end of the pipe is always filled, the fire extinguishing liquid can be released simultaneously with the operation of the sprinkler head by fire detection. . However, if the sprinkler head is opened due to an accident such as being hit by an object, the pressurized fire extinguishing liquid is released, and the pump is stopped after confirming that the pressurized liquid sending device has started and it is not a fire Until the water is sprayed, there is a problem that the water loss continues. On the other hand, in addition to the sprinkler head, a fire detector is installed, the fire detector operates due to a fire, the fire extinguishing liquid is filled up to the sprinkler head, and water is sprayed when the sprinkler head operates. Formula) There is a sprinkler fire extinguishing system. In this pre-actuated type, the air is slightly pressurized in the pipe to the sprinkler head, the fire detector detects a fire, and the closed sprinkler head operates, that is, the fire detector and the sprinkler head The fire extinguishing liquid is released only under the AND condition of above, and the piping is always filled with pressurized air. Therefore, even if the closed sprinkler head is opened due to impact, etc., water loss occurs. It has the feature of not causing an accident. However, this pre-actuated sprinkler fire extinguishing equipment requires a compressor and the like for pressurizing the secondary piping to which the closed type sprinkler head is connected, and the entire equipment becomes complicated and expensive. Even if it operates, the pressurized air will come out initially,
There is a problem that a delay occurs before the fire extinguishing liquid starts to be discharged normally.In addition, in these conventional fire extinguishing facilities, the secondary side piping system provided with a sprinkler head at the time of fire extinguishing has the primary side of the district valve. Because the same high hydraulic pressure is applied to the secondary side piping, sprinkler heads and valves, etc., the equipment members of the secondary side piping system must use the same pressure-resistant grade as the primary side, For this reason, the cost of equipment members is one of the factors that hinder the spread of sprinkler fire extinguishing equipment.

In order to solve such various problems of the conventional sprinkler fire extinguishing system, the applicant of the present application fills the secondary piping system of the district valve with a non-pressure fire extinguishing liquid during fire monitoring. Fire extinguishing activities are performed quickly, and when the head is opened, the primary pressure is reduced to a predetermined pressure and the low-pressure fire extinguishing liquid is discharged to improve the fire extinguishing efficiency, and the pressure resistance of the secondary piping system equipment members Sprinkler fire extinguishing systems that can reduce the grade have been proposed as Japanese Patent Application Nos. 2-411267 and 3-10383.

[0004]

In the above proposed fire extinguishing system, the sprinkler head is connected to the main pipe of the secondary piping system of the district valve simply through a branch pipe. For this reason, there is a considerable difference in the liquid discharge pressure between the sprinkler head located far from the regional valve and the sprinkler head located close to it. Therefore, usually, the position where the liquid discharge pressure becomes the lowest is calculated, and in consideration of simultaneous opening of a certain set number of sprinkler heads at this position, the head at the above position is operated under a predetermined condition (for example, 1 kgf / cm ² at 1 kgf / cm ²⁾ . (80 L / min). Therefore, the liquid discharge pressure of the head at a position other than the above-mentioned position naturally becomes higher than the above-mentioned predetermined condition, and there is a disadvantage in the fire extinguishing effect. That is, when the liquid discharge pressure is excessive, as described in Japanese Patent Application No. 3-18416 already proposed by the present applicant, a diameter which is considered to be effective for speeding up the fire extinguishing operation is about 1.5. The proportion of water droplets of ~ 2.0 mm decreases, the amount of extremely fine water droplets of less than 1.0 mm increases, the amount of ineffective water that is inconvenient for fire extinguishing operation increases, and the smoke generated by a fire and accumulated on the ceiling is Agitated by the air flow by the water discharge, the smoke goes down to the floor and the visibility becomes poor, which hinders the fire extinguishing operation and evacuation operation.
The larger the guard area is, the higher the maximum value of the liquid discharge pressure in the warning area is, and the above-mentioned disadvantages of the fire extinguishing operation and the evacuation operation are more serious. The present invention has been made in view of the above-mentioned problems with the conventional sprinkler fire extinguishing equipment, and has a configuration in which the liquid discharge pressure of each sprinkler head is within an allowable range of a predetermined pressure that is convenient for fire extinguishing operation and the like over a wide range of the alert area. It is an object.

[0005]

To solve the above-mentioned problems, the invention of claim 1 comprises a primary pipe 9 connected to a fire extinguishing liquid supply means 11 and a secondary pipe connected to a closed type sprinkler head 4. A district valve 6 is provided to communicate with or block the communication with the system 5. Under normal conditions, the secondary piping system 5 is filled with a non-pressure fire-extinguishing liquid and the district valve 6 is in a closed state. A sprinkler fire extinguishing system equipped with a pressure control device that adjusts the pressure of the fire extinguishing liquid in the primary pipe 9 to a predetermined pressure and supplies it to the secondary pipe system 5 by a signal based on the fire detection means 1 that detects the fire. In the equipment, the pressure control device controls the pressure in a cylinder chamber 22 having a piston 21 integrated with the valve body 20 by a pressure control pilot valve 41 that detects a hydraulic pressure on the secondary side 7 of the district valve 6. Open and close the valve 6 to open the secondary side At least a part of the main pipe 25, the branch pipe 28, and the like constituting the secondary piping system 5 from the secondary side 7 of the district valve 6 to the sprinkler head 4. It is characterized by being constituted by an annular pipe 26 on the base side or an annular pipe 29 on the head side.

According to a second aspect of the present invention, in the sprinkler fire extinguishing system of the first aspect, the secondary piping system 5 includes a main pipe 25 from the secondary side 7 of the district valve 6 and a branch branched from the main pipe 25. The sprinkler head 4 is provided by branching off from the branch pipe 28, and a part or substantially all of the main pipe 25 and the branch pipe 28 are provided with a base-side annular pipe 26 and a head-side annular pipe 29. It is characterized by comprising.

[0007]

According to the first aspect of the present invention, the positions of the branch pipes 28 and the sprinkler heads 4 are different from those of the base-side annular pipe 26 or the head-side annular pipe 29 to which they are connected. The total distance between the left and right turns within 26 and 29 is almost the same between the above-mentioned positions. Accordingly, the fire-extinguishing liquid from the fire-extinguishing liquid supply means 11 is regulated at the secondary side 7 of the district valve 6 by the pressure regulating device, so that the base side annular pipe 2 is formed.
6 or the hydraulic pressure of the fire extinguishing liquid flowing into each of the annular pipes 29 on the head side, or into both the annular pipe 26 on the base side and the annular pipe 29 on the head side, is substantially between the above-described positions. The fire extinguishing liquid discharged from any of the sprinkler heads 4 has a substantially uniform predetermined pressure which is convenient for fire extinguishing operation and the like. The pressure control device for reducing the pressure of the fire extinguishing liquid in the primary pipe 9 to a predetermined pressure and supplying the same to the secondary pipe system 5 includes a pressure control pilot valve 4 for detecting the liquid pressure on the secondary side 7 of the district valve 6.
1, a cylinder chamber 22 provided with a piston 21 integral with the valve body 20 is pressurized and controlled to open and close the valve body 20 of the regional valve 6 to adjust the hydraulic pressure on the secondary side 7 to a predetermined value. Since the valve element 20 opens quickly and with a sufficient stroke in accordance with the movement of the piston 21, even the opening operation of a large number of sprinkler heads 4 can be sufficiently dealt with, for example, by one regional valve 6. it can. And Claim 2
According to the invention, the main pipe 25 from the secondary side 7 of the district valve 6 and a part or substantially all of the branch pipe 28 branched from the main pipe 25 are connected to the base side annular pipe 26 and the head side annular pipe 29.
And a plurality of main pipes 25 and branch pipes 2
The hydraulic pressure of the fire extinguishing liquid flowing into both the base-side annular pipe 26 and the head-side annular pipe 29 via the pipes 8 is substantially the same between the above-described positions, and is discharged from the large number of sprinkler heads 4 respectively. The fire extinguishing fluids all had substantially equal predetermined pressures, making them suitable for extinguishing fires in large alert areas.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention. In the upper half of the figure, there is a warning area, a fire detector 1, a sprinkler head 4 and a fire extinguishing liquid supply means 11 installed therein. The district valve 6 and the like provided branching from the water supply main pipe 12 are shown, and the fire extinguishing liquid supply means 11 is shown in the lower half of FIG. A fire detector 1 of a photoelectric type, an ionization type, a differential type, a constant temperature type, or the like as a fire detecting means for detecting a fire phenomenon in a caution area is installed via a power line 2 to a fire receiver 3 (disaster prevention center or the like). )It is connected to the. Fire detector 1
Similarly, the closed type sprinkler head 4 provided on the ceiling of the guard area is connected to the secondary side 7 of the district valve 6 installed on each floor of the building via the secondary piping system 5, The primary side 8 of the valve 6 is connected to the branch pipe 30 via the primary pipe 9 and the primary side valve 65, and the branch pipe 30 is connected to the fire pump 10 of the fire extinguishing liquid supply means 11 by the water supply main pipe 12.

The illustrated secondary pipe system 5 includes a secondary pipe 25 (which forms a part of the main pipe) connected to the secondary side 7 of the district valve 6, and a terminal of the secondary pipe 25. A loop-shaped main pipe 26 having a rectangular annular shape in plan view as an example of a base-side annular pipe connected to
, And a plurality of sprinkler heads 4 are disposed in each of the branch pipes 28 via unwinding pipes. In the illustrated example, the loop-shaped main pipe 26 is provided.
Of the branch pipe 2 is formed sufficiently large.
8 is shortened.

On the secondary side of the fire pump 10, a check valve type automatic alarm valve 13 having a function of detecting a flowing liquid is connected to the water supply main pipe 12. The disc (not shown) is opened by the large liquid flow due to the liquid discharged from the sprinkler head 4 to pressurize the pressure chamber, and the opening of the sprinkler head 4 is notified to the fire receiver 3 through the electric circuit 31 by the operation of the pressure switch (not shown). It is a configuration to do.

In the illustrated example, the district valve 6 and a starting valve 24 for opening the same, and a pressure regulating pilot valve 41 for reducing and adjusting the fire extinguishing liquid in the primary pipe 9 to a predetermined pressure suitable for the fire extinguishing operation.
A motor-operated remote-controlled test valve 14 that opens the regional valve 6 by remote control; a small-diameter test valve 15 capable of draining one sprinkler head 1; and a plurality of sprinkler heads 1 capable of draining. Parent-child valve 17 combined with large-diameter test valve 16
A pressure switch 32 for detecting the hydraulic pressure on the secondary side 7 of the district valve 6, a pipe connecting these valves such as the pressure regulating pilot valve 41 to the district valve 6, a remote control test valve 14 and the like. And the terminal box 34 connected to the fire receiver 3 as a circuit 33 by collecting the circuits of the pressure switch 32 and the unit U. The motor 53 of the fire pump 10 is connected to a pump starting board 60 via an electric circuit 54.

FIG. 2 shows details of each member constituting the unit U. The exemplified district valve 6 is configured such that a valve seat 18 that separates the primary side 8 and the secondary side 7 is closed by a valve body 20 urged by a spring 19, and a piston 21 and a valve box integrated with the valve body 20. A cylinder 22 is formed by this and this cylinder chamber 22 is connected to the primary side 8 by a pipe 46 via a starting valve 24. The starting valve 24 is opened and closed by a motor, an electromagnetic solenoid or the like connected to the fire receiver 3 via the terminal box 34 via the electric circuit 17.

The illustrated pressure regulating pilot valve 41 introduces the hydraulic pressure of the secondary side 7 from the secondary side piping system 5 to the operation chamber 37 of the secondary side piping system via the pipe 36, and reduces the hydraulic pressure of the cylinder chamber 22 of the district valve 6.
The liquid is drained to a drain pipe 40 via a pipe 38 and a valve seat 39. When the hydraulic pressure on the secondary side 7 introduced into the operation chamber 37 is lower than a predetermined pressure, the valve body 44 closes the valve seat 39 by the pressure regulating action of the flam 42 and the spring 43, and the cylinder chamber 22
Works to suppress the drainage of the pressure fluid into the drain pipe 40, and the district valve 6 is opened by the introduction of the fire extinguishing fluid on the primary side 8 from the pipe 46 to the cylinder chamber 22 via the starting valve 24,
The pressure fluid on the secondary side 7 rises. When the hydraulic pressure on the secondary side 7 is higher than a predetermined pressure, the valve body 44 is opened by the pressure regulating action of the flam 42 and the spring 43 to increase the drainage of the pressure liquid in the cylinder chamber 22 to the drain pipe 40. Thus, the district valve 6 is closed, and the hydraulic pressure on the secondary side 7 is reduced and adjusted to a predetermined pressure suitable for the fire extinguishing operation.

The illustrated remote-controlled test valve 14 is opened and closed by a motor 63 connected to the fire receiver 3 via a terminal box 34 via an electric circuit 62 and an electric unit 63 such as an electromagnetic solenoid.
The size of the opening is set so that the fire extinguishing liquid equivalent to one sprinkler head 4 is drained by opening the sprinkler head 4. The small-diameter test valve 15 using the illustrated parent-child valve has a fire extinguishing liquid equivalent to one sprinkler head 4, and the large-diameter test valve 16 has a fire extinguishing amount equivalent to a plurality of sprinkler heads 4. The size of the opening is set so that the liquid is drained by opening the liquid. The opening of the district valve 6 is detected by the pressure switch 32 provided in the pipe 47 (instructed to the fire receiver 3 via the terminal box 34 by the electric circuit 64), and the remote operation test valve 14, the small diameter test valve 15,
At the time of the drainage test performed by opening one of the large-diameter test valves 16, it is checked whether the hydraulic pressure in the secondary piping system 5 is maintained at a predetermined pressure. 13.

Next, the operation of this embodiment will be described.
First, a non-pressure fire extinguishing liquid is filled in a secondary piping system such as the sprinkler head 4 and the secondary piping system 5. That is, the primary side valve 65 is opened, and the fire extinguishing liquid supply unit 11 opens the primary side valve 8.
, The primary side valve 65 is closed, the starting valve 24 is opened, and the pressure fluid on the primary side 8 is introduced into the cylinder chamber 22 so that the district valve 6 can be opened. When the fire extinguishing fluid slowly flows into the secondary piping system 5 by gradually opening the main valve 65, the secondary piping system 5, the sprinkler head 4
Is filled with a non-pressure fire extinguishing liquid, and the closing of the start-up valve 24 puts the district valve 6 in a monitoring state.

When a fire occurs and the fire detector 1 operates in this state, a fire signal is transmitted to the fire receiver 3. The fire receiver 3 operates the motor 35 in response to the fire signal to open the starting valve 24, and the fire extinguishing liquid on the primary side 8 is introduced into the cylinder chamber 22 of the district valve 6 via the pipe 46 and the starting valve 24 and pressurized. The piston 21 slowly moves the valve body 20 away from the valve seat 18, and the fire extinguishing liquid in the primary pipe 9 is gradually introduced into the secondary pipe system 5. Since the inside of the secondary piping system 5 is already at the monitoring pressure, an abnormally high pressure (water hammer) caused by the high-pressure fire extinguishing liquid flowing into the secondary piping system 5 at one time when the district valve 6 is opened. Phenomenon) is prevented. District Valve 6
The pressure switch 32 detects that the inside of the secondary piping system 5 reaches a predetermined pressure due to the action of the pressure regulating pilot valve 41 due to the opening by the fire signal, and the fire receiver 3 notifies the fire occurrence in the warning area. You.

After that, including during the fire extinguishing activity, the opening and closing operation of the valve body 44 of the pressure regulating pilot valve 41 controls the introduction of the fire extinguishing liquid into the secondary piping system 5, and the pressure is adjusted to a predetermined pressure. That is, when the fluid pressure in the operation chamber 37 is lower than the predetermined pressure, the valve body 44 is moved to the valve seat 39 by the pressure regulating action of the flam 42 and the spring 43.
Is closed to suppress the drainage of the pressure fluid in the cylinder chamber 22 to the drain pipe 40. The introduction of the fire extinguishing fluid into the cylinder chamber 22 from the pipe 46 causes the district valve 6 to open, and the fluid on the secondary side 7 to open. When the pressure is higher than a predetermined pressure, the valve body 44 is closed by the pressure regulating action of the flam 42 and the spring 43 to increase the drainage of the pressure fluid in the cylinder chamber 22 to the drain pipe 40, and the district valve 6 is closed. Then, the inside of the secondary piping system 5 is maintained at a predetermined pressure.

When the temperature at the fire spot further rises, the sprinkler head 4 near the fire spot is opened to extinguish the fire extinguishing fluid in the secondary piping system 5 regulated at the secondary side 7 of the district valve 6. From the sprinkler head 4 to the district valve 6
Irrespective of the distance between them, they are always emitted at approximately the same pressure. That is, the connection position of each branch pipe 28 with respect to the loop-shaped main pipe 26 (the position of the falling pipe 27) is determined in consideration of the total distance between the left and right sides in the loop-shaped main pipe 26. The connection positions are the same. Then, a loop-shaped main pipe 26 is connected to a certain opened sprinkler head 4.
It can be considered that the fire extinguishing liquid flows through the inside of the sprinkler head 4 in the left-handed and right-handed paths, and the fire extinguishing liquid having the total hydraulic pressure in the left-handed and right-handed paths is discharged from the sprinkler head 4. Therefore, when the sprinkler head 4 is opened, these branches are connected between the branch pipe 28 connected to a position far from the secondary pipe 25 and the branch pipe 28 connected to a position close to the secondary pipe 25. It can be considered that there is almost no difference in the hydraulic pressure in the pipe 28, and the hydraulic pressure in the branch pipe 28 at any position is within an allowable range of a predetermined pressure convenient for fire extinguishing operation and the like. In particular, the pressure regulating device for reducing the pressure of the fire extinguishing liquid in the primary pipe 9 to a predetermined pressure and supplying the same to the secondary piping system 5 is a pressure regulating pilot valve 41 for detecting the fluid pressure on the secondary side 7 of the district valve 6. By controlling the pressurization of a cylinder chamber 22 provided with a piston 21 integral with the valve body 20, the valve body 20 of the regional valve 6 is opened and closed to adjust the hydraulic pressure on the secondary side 7 to a predetermined value. Since the valve element 20 opens promptly and with a sufficient stroke with the movement of the valve 21, the opening operation of a large number of sprinkler heads 4 can be sufficiently dealt with, for example, by one regional valve 6. This is effective in reducing equipment costs. In addition, since the branch pipes 28 are set to be short as described above, the hydraulic pressure discharged from each sprinkler head 4 in any of the branch pipes 28 is substantially constant, although there is a slight difference depending on the distance from the falling pipe 27. Is within the allowable range of the predetermined pressure. In the above conventional fire extinguishing equipment, the sprinkler head near the secondary side piping has an excessive liquid discharge pressure, which increases the amount of invalid water that is inconvenient for fire extinguishing operation, and agitates the smoke stagnating on the ceiling with the high-pressure water discharge. And the smoke goes down to the floor, causing poor visibility,
Although there was a big problem that the fire extinguishing operation and the evacuation operation were hindered, in this embodiment, the primary pressure was reduced to a predetermined pressure by the pressure regulating pilot valve 41, and the secondary side 7 became a low-pressure fire extinguishing liquid. The sprinkler head 4 is connected via the loop-shaped main pipe 26 in combination with the sprinkler head 4 so that the discharge pressure of the sprinkler head 4 at any position in a wide warning area is convenient for fire extinguishing operation and the like. Within the allowable range of the predetermined pressure, the conventional problem is simply
And it was surely resolved.

When the sprinkler head 4 is opened, a liquid flow is generated in the water supply main pipe 12, and the liquid flow causes the automatic alarm valve 1 to operate.
The disc (not shown) 3 is opened to pressurize the pressure chamber,
By operating a pressure switch (not shown), the fire receiver 3 is notified of the opening of the sprinkler head 4 and the start of operation of the fire extinguishing equipment through the electric circuit 31. The fire receiver 3 is notified of the occurrence of a fire in the caution zone of FIG. 1 by detecting the opening of the district valve 6 by the pressure switch 32, so that the fire receiver 3 extinguishes the fire in the caution zone of FIG. Display activities correctly. The hydraulic pressure in the secondary piping system 5 is
1, the pressure switch 32 for detecting the hydraulic pressure of the secondary piping system 5 cannot detect the pressure reduction of the secondary piping system 5 due to the opening of the sprinkler head 4. Is detected by the automatic alarm valve 13, it is possible to correctly display that the fire extinguishing equipment is operating on the fire receiver 3 or the like. According to this embodiment, since the hydraulic pressure in the secondary piping system 5 is sufficiently reduced and adjusted by the pressure regulating pilot valve 41, the fire extinguishing operation is effectively performed. The sprinkler fire extinguishing system which can be performed and the pressure resistance grade of the equipment of the secondary piping system is sufficiently low, does not cause breakage of the equipment due to the conventional high-pressure liquid, and can reduce the equipment cost. It became. At the time of monitoring a fire filled with no pressure, a small amount of low-pressure fire extinguishing liquid is released when the sprinkler head 4 is opened due to an impact or the like. In addition to the above, a compressor for constantly pressurizing the secondary piping system 5 with air, such as a pre-operation type, becomes unnecessary in this embodiment, and the equipment cost is reduced.

Further, in this embodiment, since the unit valve U includes the district valve 6, the remote control test valve 14, the pressure regulation pilot valve 41, and the like, these functional tests are performed using a test stand (not shown) before site construction. be able to. That is, a test water supply pump is connected to the primary pipe 9 of the unit U, the secondary pipe system 5 is closed with a blind plug or the like, and the terminal box 34 is connected to a connector of a fire receiver on the test stand by a connector (not shown). Then, the pressure-reducing adjusting liquid operation by the pressure regulating pilot valve 41, when the small-diameter test valve 15 is opened to release the fire extinguishing liquid for one sprinkler head, or when the large-diameter test valve 16 is opened and the sprinkler head 4 When the fire extinguishing liquid for each piece is discharged, whether the hydraulic pressure in the secondary piping system 5 is maintained at a predetermined pressure by the pressure switch 32, and whether the starting valve 24 and the remote control test valve 14 are By opening with an electric signal, it is possible to confirm in advance that the operation of the district valve 6 is remotely inspected by a signal from the pressure switch 32 or the like. The main component of the sprinkler fire extinguishing equipment, such as the district valve 6 and the pressure control pilot valve 41, was the unit U. Therefore, before the construction on site, the piping work around the unit U, the function test, and the adjustment work were easily and accurately performed. In addition, at the construction site, only a small amount of on-site work for connecting the unit U to the on-site piping and wiring is required, and labor can be saved.

FIG. 2 is a block diagram showing a second embodiment of the present invention. In the second embodiment, the branch pipe 28 in the first embodiment is also formed as a loop-shaped branch pipe 29 having a rectangular annular shape in a plan view as an example of an annular pipe on the head side. The components are the same as those of the first embodiment, and are denoted by the same reference numerals, and the description of the structure is omitted. The arrangement position of each sprinkler head 4 with respect to the loop-shaped branch pipe 29 is as follows.
The total distance between the left and right sides of the loop-shaped branch pipe 29 is the same between the respective disposition positions, and therefore, the sprinkler head 4 disposed far from the falling pipe 27, There is almost no difference in the hydraulic pressure in the loop-shaped branch pipe 29 between the sprinkler head 4 and the sprinkler head 4 arranged at a position close to the falling pipe 27. It is within the allowable range. Moreover, this ru
The fire-extinguishing liquid having substantially the same hydraulic pressure is introduced into each loop-shaped branch pipe 29 by the loop-shaped main pipe 26 on the base side connected to the primary side of the loop-shaped branch pipe 29. -The hydraulic pressure discharged from each sprinkler head 4 in the branch pipe 29 can be made more uniform than in the first embodiment, and the fire extinguishing operation and the like in a wide security area can be performed more efficiently. is what happened.

FIG. 4 shows a loop-shaped main tube 56 in the shape of a sun in plan view.
FIG. 5 is a block diagram showing a main part of a third embodiment of the present invention, using FIG. 5. FIG. 5 is a main part of a fourth embodiment of the present invention using a loop-shaped branch pipe 59 having an eye shape in plan view. FIG. As described above, the loop-shaped main pipe and the loop-shaped branch pipe in the above-described embodiment are symmetrical with respect to the center thereof, for example, in a plan view, for example, a circular shape, an eight-shaped shape, a rectangular shape, etc. The sprinkler heads 4 can have substantially the same effect as the first and second embodiments in that they can have substantially the same discharge pressure from each sprinkler head 4. Can be

[0023]

As described above, according to the first aspect of the present invention,
The position of each branch pipe 28 and each sprinkler head 4 is determined by the left and right rotations in the annular pipes 26 and 29 with respect to the base-side annular pipe 26 or the head-side annular pipe 29 to which they are connected. In the total distance around, the positions are almost the same between the above positions, so that the fire extinguishing liquid from the fire extinguishing liquid supply means 11 is regulated by the pressure regulating device on the secondary side 7 of the district valve 6 so that the base side annular ring is formed. Flow into the pipe 26 or the annular pipe 29 on the head side, or the annular pipe 2 on the base side thereof.
6. The hydraulic pressure of the extinguishing liquid flowing into both of the annular pipes 29 on the head side is substantially the same between the above-described positions, and the extinguishing liquid discharged from any of the sprinkler heads 4 is suitable for fire extinguishing operation and the like. A good and substantially uniform predetermined pressure was obtained. In particular, the fire-extinguishing liquid in the primary pipe 9 is reduced to a predetermined pressure and the secondary pipe system 5 is adjusted.
The pressure regulating device supplied to the valve is controlled by pressurizing a cylinder chamber 22 having a piston 21 integrated with the valve body 20 by a pressure regulating pilot valve 41 for detecting the hydraulic pressure on the secondary side 7 of the district valve 6. 6, the opening and closing operation of the valve element 20 to adjust the hydraulic pressure on the secondary side 7 to a predetermined value. As the piston 21 moves, the valve element 20 is quickly and sufficiently moved.
Therefore, even if a large number of sprinkler heads 4 are released in the opening operation, for example, one district valve 6 can sufficiently cope with the opening operation, which is effective in reducing equipment costs.

According to the second aspect of the present invention, any or substantially all of the main pipe 25 from the secondary side 7 of the district valve 6 and the branch pipe 28 branched from the main pipe 25 are connected to the base side annular pipe. 26 and the annular pipe 29 on the head side, the hydraulic pressure of the fire extinguishing liquid flowing into both the annular pipe 26 on the base side and the annular pipe 29 on the head side via the plurality of main pipes 25 and the branch pipes 28. The fire extinguishing liquid discharged from each of the large number of sprinkler heads 4 has a substantially uniform predetermined pressure, which is suitable for fire extinguishing in a wide warning area.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing details of a unit in FIG. 1;

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a block diagram showing a main part of a third embodiment of the present invention.

FIG. 5 is a block diagram showing a main part of a fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fire detector (fire detection means) 4 Sprinkler head 5 Secondary side piping system 6 District valve 7 Secondary side 9 Primary side piping 11 Fire extinguishing liquid supply means 25 Main pipe 26, 56 Loop main pipe (base annular pipe) ) 28 Branch pipe 29, 59 Loop-shaped branch pipe (annular pipe on head side)

Claims (2)

(57) [Claims] 1. A district valve 6 is provided for communicating or cutting off a primary pipe 9 connected to a fire extinguishing liquid supply means 11 and a secondary pipe system 5 connected to a closed type sprinkler head 4. Under normal conditions, the secondary side piping system 5 is filled with a non-pressure fire extinguishing liquid and the district valve 6 is closed, and the district valve 6 is opened by a signal based on the fire detection means 1 for detecting a fire phenomenon. In a sprinkler fire extinguisher equipped with a pressure regulator for reducing the pressure of the fire extinguishing liquid in the primary pipe 9 to a predetermined pressure and supplying the same to the secondary pipe system 5, the pressure regulator is provided on the secondary side 7 of the district valve 6. By controlling the pressurization of the cylinder chamber 22 having the piston 21 integrated with the valve body 20 by the pressure regulating pilot valve 41 for detecting the hydraulic pressure of the fluid, the regional valve 6 is opened and closed to maintain the hydraulic pressure on the secondary side 7 at a predetermined value. To be adjusted, the secondary side 7 of the district valve 6 At least a portion of the secondary side piping system 5 constitute in which main 25 and branch tube 28, etc. up to Luo sprinkler head 4, the proximal annular pipe 26
Alternatively, the sprinkler fire extinguishing equipment is constituted by an annular pipe 29 on the head side. 2. The secondary piping system 5 includes a main pipe 25 from the secondary side 7 of the district valve 6, a branch pipe 28 branched from the main pipe 25, and a sprinkler head branched from the branch pipe 28. 4
The sprinkler according to claim 1, wherein a part or substantially all of the main pipe (25) and the branch pipe (28) are formed by a base-side annular pipe (26) and a head-side annular pipe (29). Fire extinguishing equipment.