JPH04253871A - Fire extinguishing sprinkler installation - Google Patents

Abstract

PURPOSE:To provide an economical fire extinguishing sprinkler simply installed by preventing sufficiently a water hammer phenomenon in opening an open valve and enabling the pressure resisting grade of apparatus members in the secondary side piping system to be reduced at ease. CONSTITUTION:An open valve 6 having the primary side piping 16 connected to a fire extinguishing liquid supply means 13 and the secondary side piping 5 connected to a closed type sprinkler head 4 respectively is a normally closed one to be opened according to a signal based on a fire detecting means 1 for detecting a fire phenomenon. In a fire extinguishing installation provided with a pressure regulating device R for supplying fire extinguishing liquid having pressure adjustably reduced to predermined one from the primary side piping 16 to the secondary side piping 5, when liquid pressure in the secondary side piping 5 exceeds the predetermined pressure, a pressure rise preventing means D seats a valve disc 15 of the open valve 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to sprinkler fire extinguishing equipment.

0002

2. Description of the Related Art Various types of sprinkler fire extinguishing equipment have been used, including open type, closed type wet type, and dry type. Conventionally, in closed sprinkler fire extinguishing equipment, pressurized fire extinguishing liquid is always filled up to the end of the closed sprinkler head installed in each warning area, and water can be sprayed at the same time as a fire is detected. This is the most common equipment used in buildings, etc. In a closed sprinkler fire extinguishing system, a large amount of extinguishing liquid will be released if the sprinkler head is damaged, so a fire detector is installed in addition to the sprinkler head, and when the fire detector is activated due to a fire, the extinguishing liquid will reach the sprinkler head. Pre-activation type (filling) and spraying water when the sprinkler head operates.
There is a pre-action type sprinkler fire extinguishing system. In this pre-activation system, the air inside the pipe to the sprinkler head is slightly pressurized, so fire extinguishing fluid will not be released if the sprinkler head breaks or malfunctions. Therefore, they are installed in places where water damage is extremely difficult, such as department stores.

0003

[Problem to be Solved by the Invention] In closed sprinkler fire extinguishing equipment, pressurized extinguishing liquid is always filled up to the end of the piping, so it is possible to release extinguishing liquid at the same time as the sprinkler head operates when a fire is detected. It has the characteristic of being. However, if the sprinkler head opens due to an accident such as being hit by an object, pressurized fire extinguishing fluid is released and the pressurization device is activated to confirm that there is no fire and then stop the pump. Until then, water continues to be sprinkled, leading to serious water damage.

On the other hand, pre-acting sprinkler fire extinguishing equipment is
Extinguishing liquid is released only when the fire detector detects a fire and the closed sprinkler head is activated, that is, based on the AND condition of the fire detector and the sprinkler head. Since it is only filled with pressurized air, it has the characteristic that even if the closed sprinkler head opens due to an impact or the like, it will not cause a water damage accident. However, this requires a compressor, etc. to pressurize the secondary piping to which the closed sprinkler head is connected, making the entire equipment complex and expensive. There is a problem in that there is a delay before the fire extinguishing liquid starts to be released normally because the air is released.

[0005] In order to compensate for each of the disadvantages of the conventional system, a fire detector and a closed type sprinkler head are installed in the restricted area, the primary side piping of the open valve is used as a fire extinguishing liquid supply means, and the secondary side piping is closed. When the release valve is open, the fire extinguishing liquid in the primary side piping is reduced to a predetermined pressure and supplied to the secondary side piping.
Sprinkler fire extinguishing equipment has been proposed in which the pressure resistance grade of equipment members of the secondary piping system, such as secondary piping and sprinkler heads, can be lowered to reduce equipment costs. However, with this sprinkler fire extinguishing equipment, there is always a large difference in liquid pressure between the primary and secondary sides of the release valve, and for this reason, when the release valve is opened, a large primary pressure is instantaneously introduced into the secondary piping system. As a result, a large water hammer phenomenon (abnormal pressure increase) occurs, and there remains concern about lowering the pressure resistance grade of the equipment components of the secondary piping system.

[0006] This invention was proposed in order to solve these various problems of conventional sprinkler fire extinguishing equipment, and it is possible to sufficiently prevent the water hammer phenomenon when the release valve is opened. Pressure-resistant gray for equipment components of the secondary piping system
To provide sprinkler fire extinguishing equipment that allows the fire to be lowered with peace of mind, has a simple equipment configuration, and is inexpensive.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides that the primary side pipe 16 is connected to the extinguishing liquid supply means 13,
Open valves 6 and 56 connected to the sprinkler head 4 whose secondary piping 5 is closed are provided, respectively.
56 is in a closed state under normal conditions, and is opened by a signal based on the fire detection means 1 that detects a fire phenomenon, and the extinguishing liquid in the primary side pipe 16 is reduced in pressure and adjusted to a predetermined pressure and supplied to the secondary side pipe 5. The sprinkler fire extinguishing equipment equipped with the pressure device R has a pressure increase prevention means D that seats the valve bodies 15, 65 of the release valves 6, 56 when the liquid pressure in the secondary side pipe 5 exceeds the predetermined pressure. .

The valve element 15 of the open valve 6 opens when the pressure in the cylinder chamber 20 is reduced, in which a piston that is interlocked with the valve element 15 slides, and the pressure increase prevention means D rapidly moves the inside of the cylinder chamber 20. It is configured to be pressurized.

The valve element 65 of the release valve 56 opens when pressurized within the cylinder chamber 70 in which a piston that is interlocked with the valve element 65 slides. It is configured to rapidly depressurize.

0010

[Operation] Based on the detection signal of the fire detection means 1, the release valve 6,
56 is opened, and the pressure liquid on the primary side 8 is reduced in pressure to a predetermined pressure by the pressure regulator R, and the secondary side pipe 5 is filled with the liquid. When the release valves 6 and 56 are first opened, the liquid pressure in the secondary pipe 5 attempts to rapidly rise above a predetermined pressure while the pressure regulation device R is not able to regulate the pressure. At this time, the pressure increase prevention means D seats the valve bodies 15, 65 of the release valves 6, 56, and
Close 56. This prevents a sudden rise in hydraulic pressure within the secondary piping 5 and suppresses the occurrence of the water hammer phenomenon. Therefore, it is sufficient that the pressure resistance grade of the equipment components of the secondary side piping system is sufficiently low, and the sprinkler fire extinguishing equipment can reduce equipment costs without causing damage to equipment components due to high-pressure liquid as in the past. Ta.

The valve element 15 of the release valve 6 is a so-called pressure-reducing type that opens when the pressure in the cylinder chamber 20 in which the piston interlocking with the valve element 15 slides is reduced. By rapidly pressurizing the inside of the chamber 20, the open valve 6 can be quickly closed and an abnormal pressure increase inside the secondary pipe 5 can be prevented.

The valve body 65 of the release valve 56 is a so-called pressure-opening type that opens by pressurization in the cylinder chamber 70 in which a piston sliding in conjunction with the valve body 65 is used. By rapidly reducing the pressure in the cylinder chamber 70, the release valve 56 can be quickly closed, and an abnormal pressure increase in the secondary pipe 5 can be prevented.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a first embodiment of a sprinkler fire extinguishing system. A fire detector 1 such as a differential type or a constant temperature type fire detector 1 serving as a fire detection means for detecting a fire phenomenon in a warning area is connected to a receiving board 3 via an electric line 2. Similar to the fire detector 1, a closed sprinkler head 4 installed on the ceiling of the warning area connects the secondary side 7 of the open valve 6 via the secondary side piping 5.
connected to. The primary side 8 of the open valve 6 is connected to a pressurized liquid feeding device 13 as a fire extinguishing liquid supply means via a primary side piping 16, and is connected to a gate valve 9, a pump 10, and an electric line 11 shown in the figure. The motor connected to the receiver board 3 by
12, etc., this pressurized liquid feeding device 13 is equipped with a normal check valve, a pressurized air tank, etc., which are not shown.

The open valve 6 is divided into the primary side 8 and the secondary side 7 by the valve seat 14a, and the valve element 15 that opens and closes the valve seat 14a also serves as a piston fitted into the valve box. The back part and the valve box form a cylinder chamber 20, and the secondary side 7
A signal water entry chamber 22 is formed by a valve seat 14b provided on the outer circumferential side of the valve seat 14a, and the valve body 15 is a so-called reduced pressure opening type in which the valve body 15 is biased by a spring 18 to close the valve seats 14a and 14b. The valve body 15 has a small hole 19 for introducing a part of the hydraulic pressure on the primary side 8. Also,
The opening and closing operations of the valve body 15 are controlled by a pressure regulating pilot valve 21 as a pressure regulating device R so that the hydraulic pressure on the primary side 8 is reduced to a predetermined pressure and supplied to the secondary side 7. That is, the pressure regulating pilot valve 21 includes an operating chamber 17 that communicates with the cylinder chamber 20 via a pipe 23, a pressure regulating valve seat 26 that communicates the operating chamber 17 with a drain pipe 25 via a starting valve 24, and a flam 29. It has a pressure regulating valve body 28 which is biased by a spring 27 in a direction to open the pressure regulating valve seat 26, and a pressure regulating chamber 30 communicating with the secondary side 7 via a pipe 31.

Further, the valve body 15 of the release valve 6 monitors the hydraulic pressure in the secondary pipe 5 and operates when the hydraulic pressure exceeds the predetermined pressure set by the pressure regulator R. The operation of the water entry pilot valve 32 as the prevention means D is also controlled so that it is rapidly closed. The water inlet pilot valve 32 includes a water inlet valve seat 34 that communicates with the cylinder chamber 20 through a pipe 33, and a water inlet valve body 38 that has a flam 35 and is biased in a direction to close the water inlet valve seat 34 by a spring 36.
and a water inlet valve chamber 4 that communicates with the primary side pipe 16 through a pipe 45.
6, and an opening/closing operation chamber 47 communicating with the secondary side 7 via piping 31. In this way, the secondary side 7 of the release valve 6
The hydraulic pressure is introduced into the pressure regulating chamber 30 in the direction of closing the pressure regulating pilot valve 21 and into the opening/closing operation chamber 47 in the direction of opening the water entry pilot valve 32.
The respective springs 27, 36, etc. are set so that the hydraulic pressure that opens the water entry pilot valve 32 is higher than the hydraulic pressure that closes the water entry pilot valve 32.

A drain pipe 37 with an orifice 36 is connected to the signal water inlet chamber 22, and a pressure switch 39 is connected to the drain pipe 37 to detect the pressure increase due to the opening of the release valve 6 and notify this to the receiver panel 3. It is set up. The starting valve 24 is controlled by the receiving panel 3 so as to be opened by the electric part 41 which is activated when the fire detector 1 detects a fire phenomenon. The electric part 41 is composed of a motor and an electromagnetic solenoid. The end of the secondary side piping 5 is an orifice 43 (secondary side piping 5
(disposed at a higher position than the sprinkler head 4, etc.) and is open to the atmosphere via a drain pipe 44.

Next, the operation of the above embodiment will be explained. Start-up valve 24 is initially closed. First, the secondary side piping system such as the sprinkler head 4 and the secondary side piping 5 is filled with an unpressurized fire extinguishing liquid. In this liquid filling operation, the gate valve 9 is opened and pressure is applied to the cylinder chamber 20 via the primary side 8 of the open valve 6 by the pressurized liquid feeding device 13, and then the gate valve 9
is closed, and the start valve 24 is opened to reduce the pressure in the cylinder chamber 20, thereby making the release valve 6 openable. Then, the gate valve 9 is gradually opened, and the extinguishing liquid is slowly allowed to flow into the secondary piping system of the open valve 6. The extinguishing liquid flows from the secondary side 7 of the release valve 6 to the secondary side piping 5 and the sprinkler head 4,
It flows over the orifice 43 and down into the drain pipe 44. When the extinguishing liquid exceeds the orifice 43, the starting valve 24 is closed and the release valve 6 is closed.

As a result, the pressure fluid acting on the secondary piping system is discharged to the drain pipe 44 through the orifice 43, and the secondary piping system is filled with liquid without pressure. In this way, the secondary piping system such as the secondary piping 5 and the sprinkler head 4 is filled with liquid, and the orifice 43 is used to keep the rate of communication with the atmosphere very small, thereby preventing the extinguishing liquid from dispersing into the atmosphere. It is possible to maintain a no-pressure filled state for a long time. In the normal state when the fire detector 1 is not operating, the extinguishing liquid on the primary side 8 of the open valve 6 in each warning area enters the cylinder chamber 20 through the small hole 19, and the valve body 15 is moved by the hydraulic pressure in the cylinder chamber 20 and the spring 18. The valve seats 14a and 14b are closed, and the valve body 15 is in a monitoring state. Since the secondary piping 5 and the like are filled with extinguishing liquid without pressurization, there is no discharge loss of extinguishing liquid during monitoring.

In this state, when a fire occurs and the fire detector 1 is activated, a fire signal is transmitted to the receiving board 3. In the receiver panel 3, this fire signal operates the electric part 41 and opens the starting valve 24, so the hydraulic pressure in the cylinder chamber 20 of the open valve 6 is discharged from the drain pipe 25 via the operation chamber 17, and the hydraulic pressure is reduced. The open valve 6 is opened by the hydraulic pressure on the primary side 8, the hydraulic pressure in the signal water inlet chamber 22 increases, the pressure switch 39 operates, and the receiver panel 3 is notified that the open valve 6 is open. on the other hand,
The pressure liquid on the primary side 8 flows through the secondary side 7 to the secondary side piping 5 and the piping 31 by pressurizing means such as a pressure air tank (not shown). When the fluid pressure in the secondary piping 5 rises and reaches a predetermined pressure, the fluid pressure applied from the piping 31 to the pressure regulating chamber 30 pushes the flamm 29 and the pressure regulating valve body 28 downward, the pressure regulating valve seat 26 closes, and the drain is drained. Drainage from tube 25 ceases. Further, the pressure liquid is also introduced into the opening/closing operation chamber 47 of the water inlet pilot valve 32 via the pipe 31. When the hydraulic pressure on the secondary side 7 introduced into the pressure regulating chamber 30 falls below the set pressure of the pressure regulating pilot valve 21, the pressure regulating valve body 28 is returned by the spring 27, the pressure regulating valve seat 26 is opened, and the pressure regulating valve seat 26 is opened. The pressure fluid is drained through the operation chamber 17 and transferred to the primary side 8
The valve body 15 returns due to the hydraulic pressure of The hydraulic pressure on the side 7 is adjusted to be lower than the hydraulic pressure of the extinguishing liquid on the primary side 8 to a predetermined pressure necessary for firefighting activities.

At the moment when the release valve 6 is opened by the operation of the fire detector 1, the high pressure liquid on the primary side 8 enters the pressure regulating pilot valve 21 and the water entry pilot valve 32 at once through the piping 31, Since the fluid pressure is high and the pressure regulating valve body 28 closes immediately, the pressure reduction in the cylinder chamber 20 stops, but the pressure liquid is gradually introduced into the cylinder chamber 20 of the valve body 15 through the small hole 19, is not seated immediately, and as a result, the hydraulic pressure in the secondary pipe 5 exceeds the predetermined pressure that should be regulated by the pressure regulating pilot valve 21. Small hole 1 like this
When the valve body 15 attempts to slowly close due to the pressure fluid entering the cylinder chamber 20 from the valve 9, the fluid pressure in the secondary pipe 5 rises faster than the closing speed, so the fluid in the opening/closing operation chamber 47 closes slowly. When the hydraulic pressure becomes slightly higher than the predetermined pressure, the water inlet valve body 38 rises and the water inlet valve seat 34 opens. At this time, a large amount of the pressure liquid in the primary side piping 16 passes through the piping 45 and is introduced into the cylinder chamber 20 from the piping 33 via the opened water inlet valve seat 34, and the valve body 15 is rapidly pushed into the valve seats 14a and 14b. When the person is seated, the liquid pressure in the secondary pipe 5 stops rising, and abnormal pressure rise is prevented. In this way, in a structure in which a fire extinguishing liquid whose pressure has been adjusted to be reduced is introduced into the secondary side piping 5, when the closing operation of the release valve 6 is not performed instantaneously and the degree of increase in the secondary pressure is large, the pressure regulating pilot valve is closed. 21 may not be able to adjust the pressure in time, but when the hydraulic pressure in the opening/closing operation chamber 47 of the water inlet pilot valve 32 reaches a level slightly higher than the predetermined pressure, the water inlet valve body 38 immediately opens and closes the valve body. In order to fill the cylinder chamber 20 with liquid so as to close the valve 15, the water when the release valve 6 is opened is
Turhammer phenomenon is reliably prevented.

When the temperature at the fire point further increases, the sprinkler head 4 opens and the fire extinguishing liquid in the secondary pipe 5 is released, causing a large drop in liquid pressure on the secondary side 7 to be triggered by the pressure switch of the pressure air tank (not shown). When detected, the pump 10 of the pressurized liquid supply device 13 is activated and this discharge continues until the fire is extinguished. Since the secondary piping 5 such as the sprinkler head 4 is filled with extinguishing liquid at a predetermined pressure, the extinguishing liquid is released simultaneously with the opening operation of the sprinkler head 4, and there is no delay in the extinguishing operation. Here, the pump 10 of the pressurized liquid feeding device 13 may be activated by detecting the continuous pressurization time of the pressurizing means.

In addition to the above, this embodiment does not require a compressor for constantly pressurizing the secondary piping 5 with air, such as a pre-operation type, and the equipment cost is reduced. The liquid pressure in the secondary piping system such as the secondary piping 5 and the sprinkler head 4 is regulated to a lower pressure than the primary side 8 by the pressure regulator R, so that Pressure resistant gray
The sprinkler fire extinguishing equipment requires only a sufficiently low amount of water, does not cause damage to equipment components due to high-pressure liquid, and can reduce equipment costs. During fire monitoring, when the sprinkler head 4 opens due to an impact or the like, only a small amount of unpressurized extinguishing liquid is released, and large water damage accidents that occur in conventional closed sprinkler fire extinguishing equipment can be prevented. still,
In this first embodiment, the open valve 6 and the pressure regulating pilot valve 21, which is the pressure regulating device R, are separate bodies, but they may be formed integrally.

FIG. 2 is a block diagram showing a second embodiment of the invention. In this second embodiment, the so-called pressurized opening type is used as the opening valve 56 disposed between the primary side piping 16 and the secondary side piping 5, which is opened by pressurizing the cylinder chamber 70. This is what I used. That is, the valve seat 64 that separates the primary side 8 and the secondary side 7 is closed by a valve body 65 that is biased by a spring 68, and a piston 69 integrated with the valve body 65 and a valve box open the cylinder chamber 70. The cylinder chamber 70 is connected to the primary side 8 by a pipe 72 via the orifice 36 and the starting valve 24.

Pressure regulating pilot valve 71 as pressure regulating device R
is an operation chamber 6 that communicates with the cylinder chamber 70 via piping 101.
7, a pressure regulating valve seat 76 with a small opening area communicating with the drain pipe 102, a pressure regulating valve body 78 having a flam 79 and biased in a direction to close the pressure regulating valve seat 76 by a spring 77, It has a pressure regulating chamber 80 that communicates with it via piping 103.

The drain pilot valve 82 as the pressure increase prevention means D includes a drain valve chamber 96 communicating with the cylinder chamber 70 via pipes 104 and 101, a drain valve seat 84 with a large opening area communicating with the drain pipe 105, and a flamm 85. with spring 8
6 , the drain valve body 88 is biased in a direction to close the drain valve seat 84 , and an opening/closing operation chamber 97 that communicates with the secondary side 7 via piping 103 is provided. In this way, the release valve 56
The hydraulic pressure on the secondary side 7 is introduced into the pressure regulating chamber 80 and the opening/closing operation chamber 97 so as to open the pressure regulating pilot valve 71 and the drain pilot valve 82, respectively. The respective springs 77, 86, etc. are set so that the hydraulic pressure that opens the drain pilot valve 82 is higher than the hydraulic pressure that opens the drain pilot valve 71. Components that are the same as those in the first embodiment shown in FIG.

Next, the operation of this second embodiment will be explained. Filling the secondary side piping system such as the sprinkler head 4 and the secondary side piping 5 with unpressurized fire extinguishing fluid is the same as in the first embodiment, and the filling operation is performed by opening the gate valve 9. The pressurized liquid feeding device 13 pressurizes the primary side 8 of the release valve 56, then closes the gate valve 9, opens the starting valve 24, and pressurizes the inside of the cylinder chamber 70, making the release valve 56 ready to open. Then, the gate valve 9 is gradually opened, and the extinguishing liquid is slowly allowed to flow into the secondary piping system of the open valve 56 through the orifice 36.
Then, the process ends by closing the starting valve 24 and closing the release valve 56.

When a fire occurs and the fire detector 1 is activated, the electric part 41 operates to open the starting valve 24, so that the pressure fluid on the primary side 8 of the release valve 56 is throttled by the orifice 36 and released into the cylinder chamber 70. The valve body 65 moves away from the valve seat 64 by pushing the piston 70 to the left, and the pressure liquid on the primary side 8 flows through the secondary side 7 to the secondary side piping 5 and the piping 103. When the hydraulic pressure in the secondary piping 5 increases and reaches a predetermined pressure, the flamm 79 and the pressure regulating valve body 78 are pushed upward by the hydraulic pressure applied to the pressure regulating chamber 80 of the pressure regulating pilot valve 71, and the pressure regulating valve seat 76 is pushed upward. The extinguishing liquid in the cylinder chamber 70 is opened and the extinguishing liquid in the cylinder chamber 70 is transferred to the piping 101 and the operation chamber 67.
The liquid is drained from the drain pipe 102, the cylinder chamber 70 is depressurized, the spring 68 and the hydraulic pressure on the primary side 8 cause the valve body 65 to sit, the open valve 56 closes, and the hydraulic pressure in the secondary piping 5 increases. Stop. When the hydraulic pressure on the secondary side 7 falls below the set pressure of the pressure regulating pilot valve 71, the pressure regulating valve body 78 is pushed by the spring 77 and seats on the pressure regulating valve seat 76, and the draining of liquid from the drain pipe 102 is stopped. The hydraulic pressure in the cylinder chamber 70 is restored, the valve body 65 is unseated, the release valve 56 is operated, the fire extinguishing liquid in the primary side 8 is introduced into the secondary side 7, and the hydraulic pressure in the secondary side 7 is restored. In this way, the hydraulic pressure on the secondary side 7 is equal to the hydraulic pressure of the fire extinguishing liquid on the primary side 8.
The pressure is adjusted to the predetermined pressure required for firefighting activities. In the pressure regulating pilot valve 71, the opening area of the pressure regulating valve seat 76 is formed to be small, so when the pressure regulating valve body 78 is opened, the liquid drainage speed is small, and the pressure reduction in the cylinder chamber 70 is also small. The amount of opening and closing of the valve body 15 is finely controlled, and fluctuations in the fluid pressure in the secondary piping 5 are extremely small.

At the moment when the release valve 56 is opened due to the operation of the fire detector 1, the high pressure liquid on the primary side 8 flows into the pipe 10.
3, the pressure regulating pilot valve 71 and the drainage pilot valve 82
The pressure regulating valve body 78 opens immediately, but the amount of liquid drained from the pressure regulating valve seat 76, which has a small opening area, is small, and the pressure reduction in the cylinder chamber 70 is delayed, and the liquid in the secondary piping 5 is The pressure ends up exceeding the predetermined pressure that should be regulated by the pressure regulating pilot valve 71. On the other hand, when the hydraulic pressure in the opening/closing operation chamber 97 of the drain pilot valve 82 reaches a level slightly higher than the predetermined pressure, the drain valve body 88 moves upward and opens the drain valve seat 84, which has a large opening area. Since the extinguishing liquid in the cylinder chamber 70 is rapidly drained from the drain valve seat 84 to the drain pipe 105,
The valve body 65 is quickly seated, and the rise in the hydraulic pressure in the secondary pipe 5 is stopped, thereby preventing the water hammer phenomenon when the release valve 56 is opened. In this way, when the pressure-adjusted extinguishing liquid is introduced into the secondary piping 5, the pressure regulating pilot valve 71 is designed so that the hunting phenomenon does not occur and fluctuations in the liquid pressure are small. 56 is not instantaneous, and when the degree of increase in the secondary pressure is large, the pressure regulating operation by the pressure regulating pilot valve 71 may not be in time. When the liquid pressure reaches a level slightly higher than the predetermined pressure, the release valve 6 is quickly closed by the rapid draining operation of the cylinder chamber 70 by the drain valve element 88, and the water hammer when the release valve 56 is opened is closed. This phenomenon can definitely be prevented.

Furthermore, this second embodiment does not require a compressor to constantly pressurize the secondary piping 5 with air like a pre-actuating type, so the equipment cost is low, and the secondary piping 5 and sprinkler head are not required. The liquid pressure in the secondary piping system, such as No. 4, is regulated to a lower pressure than the primary side 8 by the pressure regulator R, so the pressure resistance grade of the equipment and components of this secondary piping system must be sufficiently low. This is a sprinkler fire extinguishing system that does not cause damage to equipment components caused by conventional high-pressure liquid and reduces equipment costs. The first point is that the amount of unpressurized fire extinguishing fluid used is small, and major water damage accidents that occur with conventional closed sprinkler fire extinguishing equipment can be prevented.
It has the same effect as the embodiment. In this second embodiment as well, the release valve 56 and the pressure regulating pilot valve 71, which is the pressure regulating device R, may be formed integrally. In the above embodiment, the opening of the release valve 6 is not limited to the one based on the signal from the fire detector 1, and the end of the secondary pipe 5 is used as a drain valve to open the sprinkler head in the secondary pipe 5 under low pressure. This may be performed by a pressure change due to opening, or may be performed by a contact that detects the opening operation of the sprinkler head, including the case where no pressure is applied.

[0030]

As described above, according to the present invention, when the release valves 6, 56 are opened based on the detection signal of the fire detection means 1, when the release valves 6, 56 are initially opened, the While the pressure is not being regulated, the fluid pressure in the secondary pipe 5 is about to rise rapidly beyond the predetermined pressure, but at this time, the pressure rise prevention means D quickly closes the valve bodies 15, 65 of the release valves 6, 56. Since the opening valves 6 and 56 are closed when the vehicle is seated, a sudden rise in hydraulic pressure within the secondary pipe 5 is thereby prevented, and the occurrence of the water hammer phenomenon can be reliably suppressed. Therefore,
The pressure resistance grade of the equipment components of the secondary side piping system is sufficient to be low enough, and damage to equipment components due to high pressure fluid such as conventional water hammer phenomenon does not occur, and equipment costs can be reduced. It has become a sprinkler fire extinguishing equipment that can be used.

The release valves 6 and 56 are so-called depressurization-open or pressurization-open valves that open by depressurizing or pressurizing the cylinder chambers 20 and 70 into which pistons interlocked with the valve bodies 15 and 65 are fitted. By rapidly pressurizing or depressurizing the inside of the cylinder chambers 20, 70 using the pressure increase prevention means D, the release valves 6, 56 can be quickly closed, and an abnormal pressure increase in the secondary pipe 5 can be promptly prevented. .

In addition, in this invention, a compressor for constantly pressurizing the secondary side piping 5 with air like a pre-actuating type is not required, and the equipment cost is low, and the secondary side piping 5, sprinkler head 4, etc. Since the liquid pressure in the secondary piping system is regulated to a lower pressure than the primary side 8 by the pressure regulator R, it is sufficient that the pressure resistance grade of the equipment components of this secondary piping system is sufficiently low. , the sprinkler fire extinguishing equipment does not cause damage to equipment components due to high-pressure liquid as in the past, and can also reduce equipment costs.In addition, during fire monitoring, when the sprinkler head 4 is opened due to an impact, etc., the fire is emitted. Since the amount of unpressurized fire extinguishing fluid is small, major water damage accidents do not occur as with conventional closed sprinkler fire extinguishing equipment, making the sprinkler fire extinguishing equipment easy to implement.

[Brief explanation of the drawing]

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

FIG. 2 is a block diagram showing a second embodiment of the invention.

[Explanation of symbols]

1 Fire detector (fire detection means) 4 Sprinkler head 5
Secondary side piping 6, 56
Open valve 13 Pressurized liquid feeding device (extinguishing liquid supply means) 15, 65 Valve body 16 Primary side piping 20, 70 Cylinder chamber 21, 71 Pressure regulating pilot valve (pressure regulating device R) 2
8, 78 Pressure regulating valve body

Claims (3)

[Claims] Claim 1: The primary side piping is a fire extinguishing liquid supply means,
A sprinkler head with closed secondary piping is provided with a release valve connected to each of the sprinkler heads, and the release valve is normally closed, but is opened by a signal based on a fire detection means that detects a fire phenomenon, and the primary side piping is closed. In sprinkler fire extinguishing equipment equipped with a pressure regulating device that reduces the pressure of the extinguishing liquid in the piping to a predetermined pressure and supplies it to the secondary piping, when the liquid pressure in the secondary piping exceeds the predetermined pressure, the valve body of the release valve Sprinkler fire extinguishing equipment characterized by having pressure increase prevention means for seating the sprinkler. [Claim 2] The valve element of the opening valve is one that opens when pressure is reduced in the cylinder chamber in which a piston that is interlocked with the valve element slides, and the pressure increase prevention means is one that rapidly increases the pressure in the cylinder chamber. The sprinkler fire extinguishing equipment according to claim 1, characterized in that: [Claim 3] The valve element of the opening valve is opened by pressurization in the cylinder chamber in which a piston interlocking with the valve element slides, and the pressure increase prevention means is for rapidly reducing the pressure in the cylinder chamber. The sprinkler fire extinguishing equipment according to claim 1, characterized in that: