JPH04253870A - Fire extinguishing sprinkler installation - Google Patents

Abstract

PURPOSE:To prevent sufficiently a water hammer phenomenon in opening an open valve and enable the pressure resisting grade of apparatus members in the secondary side piping system to be degraded at ease by increasing gradually liquid pressure in a sprinkler head and the secondary side piping with a small flow passing means. CONSTITUTION:Since in the operation of a fire detector 1 a receiving board 3 operates a motor section 41 according to a fire signal to open a starting valve 24, liquid pressure in a cylinder chamber 20 of an open valve 6 is exhausted through an operating chamber 17 from a drain pipe 25 to be reduced, and the open valve 6 is opened by the primary side 8 liquid pressure and liquid pressure in a signal inflow chamber 22 is increased to operate a pressure switch 39 and inform the receiving board 3 of opening the open valve 6. On the other hand, the primary side 8 pressure liquid flows through the secondary side 7 to pipings 31, 32 by a pressurizing means such as pressure air tank. The pressure liquid to the piping 32 is throttled by an orifice 33 to flow into the secondary side piping 5, so that liquid pressure is gradually increased and a water hammer phenomenon due to the inflow is not generated.

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,
A sprinkler head 4 having a closed secondary piping 5 is provided with a release valve 6 connected to the sprinkler head 4. The release valve 6 is normally closed, and the fire detection means 1 detects a fire phenomenon.
In sprinkler fire extinguishing equipment that opens in response to a signal based on
6 has a pressure regulator R that reduces the pressure of the extinguishing fluid in the primary piping 16 to a predetermined pressure and supplies it to the secondary piping 5. The liquid passing means A, the specified flow rate liquid passing means C which passes the fire extinguishing liquid in the primary side piping 16 to the secondary side piping 5 at a specified flow rate via the release valve 6, and these liquid passing means A and C are operated respectively. First activation means 24, 55
and second starting means 34, 47, 24, and the first starting means 24, 55 based on the detection signal of the fire detection means 1.
The small flow rate liquid passing means A is operated, and after this, the specified flow rate liquid passing means C is operated by the second starting means 34, 47, 24.
The configuration is such that switching is performed.

The second activation means 34, 47, and 24 are configured to be activated by a detection signal from a pressure detection device 40 that monitors the hydraulic pressure in the secondary pipe 5.

[0009] Either one of the first starting means 24, 55 or the second starting means 34, 47, 24, or both,
Valves 24, 34 operated by electric parts 41, 42, 57,
47 and 55.

The small flow rate liquid passing means A is the specified flow rate liquid passing means C.
It is mainly composed of orifices 33 arranged in parallel to each other.

The small flow rate liquid passing means A and the specified flow rate liquid passing means C are connected to a small diameter port 49 and a large diameter port which are operated by the electric part 42.
The main body is a valve 47 having a valve 50.

0012

[Operation] Based on the detection signal of the fire detection means 1, the first activation means operates the small flow liquid passage means A, and the secondary piping system such as the sprinkler head 4 and the secondary piping 5 is operated at a small flow rate. The liquid pressure is gradually increased by the liquid passing means A, and then the prescribed flow rate liquid passing means C is operated to ensure the flow rate necessary for extinguishing the fire. As a result, when a fire is detected, initially the small flow rate liquid passing means A
The liquid pressure gradually increases while the amount of liquid passing through is limited by this, and after this, the pressure increase value due to the operation of the specified flow rate liquid passing means C becomes a smaller value than the liquid pressure due to the small flow rate liquid passing means A, and the water pressure increases gradually. The occurrence of the tar hammer phenomenon is suppressed. 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.

When the release valve 6 is opened, the extinguishing liquid whose pressure has been reduced and adjusted by the pressure regulator R is supplied to the secondary piping system, and the equipment of the secondary piping system, such as the secondary piping 5 and the sprinkler head 4, is supplied to the secondary piping system. The pressure resistance grade of the member may be sufficiently low.

From the small flow rate liquid passing means A to the specified flow rate liquid passing means C
second activation means 34, 47, 2 for switching to
4 is a pressure detection device 40 that monitors the liquid pressure in the secondary pipe 5;
Since the water hammer phenomenon is activated by the detection signal, the water hammer phenomenon can be prevented without error.

The valves 24, 34, 47, 55 constituting either or both of the first starting means 24, 55 or the second starting means 34, 47, 24 are
1, 42, 57 accurately and easily.

The small flow rate liquid passing means A is the specified flow rate liquid passing means C.
It can be easily constructed by mainly having orifices 33 arranged in parallel with each other.

The small flow rate liquid passage means A and the specified flow rate liquid passage means C are connected to a small diameter port 49 and a large diameter port which are operated by the electric part 42.
Since the main body is the valve 47 having the opening 50, it can be constructed with a small number of members.

[0018]

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 back of the valve body 15 that opens and closes the valve seat 14a is formed in the 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 biased by a spring 18 to close the valve seats 14a and 14b.
A small hole 19 for introducing a part of the hydraulic pressure of the primary side 8 is formed in the. Further, the opening and closing operations of this 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. Ru. That is, the pressure regulating pilot valve 21 communicates with the operation chamber 17 via the piping 23 to the cylinder chamber 20 and the operation chamber 17 via the starting valve 24 which is the first starting means.
The pressure regulating valve seat 26 communicates with the drain pipe 25, and the pressure regulating valve body 28, which has a flamm 29 and is biased in the direction of opening the pressure regulating valve seat 26 by a spring 27, communicates with the secondary side 7 via piping 31. It has a pressure regulating chamber 30.

The secondary side 7 of the open valve 6 is connected to the secondary side piping 5 by a small flow passage means A consisting of a pipe 32 and an orifice 33, and in parallel with this small flow passage means A,
A prescribed flow rate liquid passing means C, which is composed of a bypass valve 34 and a pipe 35 as a second starting means, is provided between the secondary side 7 and the secondary side pipe 5. A drain pipe 37 with an orifice 36 is connected to the signal water inlet chamber 22.
is equipped with a pressure switch 39 that detects the pressure increase due to the opening of the release valve 6 and notifies the receiver panel 3 of the pressure increase, and the secondary side piping 5 also serves as a pressure detection device that outputs this pressure increase or decrease to the receiver panel 3. A pressure switch 40 is provided. The starting valve 24 is a motorized part 4 that operates upon detection of a fire phenomenon by the fire detector 1.
1, the bypass valve 34 is opened by the pressure switch 4
Both are controlled by the receiving board 3 so that the secondary side pipe 5 is opened by the electric part 42 which operates when the secondary side pipe 5 reaches a preliminary pressure lower than the predetermined pressure determined by the pressure regulation by the pressure regulating pilot valve 21. The electric parts 41 and 42 are composed of motors and electromagnetic solenoids. Instead of using the pressure switch 40, the opening of the bypass valve 34 may be configured to be performed by a timer (not shown) after a certain period of time after the starting valve 24 is opened. The end of the secondary piping 5 is open to the atmosphere via an orifice 43 (provided at a higher position than the secondary piping 5, sprinkler head 4, etc.) and a drain pipe 44.

Next, the operation of the above embodiment will be explained. Start-up valve 24 and bypass valve 34 are 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, first, the gate valve 9 is opened and the primary side 8 of the open valve 6 is pressurized by the pressurized liquid feeding device 13. Next, the gate valve 9 is closed, the start valve 24 is opened, and the pressure inside the cylinder chamber 20 is reduced, so that the release valve 6 can be opened. Then, the gate valve 9 is gradually opened, and the extinguishing liquid is slowly released from the valve 6.
into the secondary piping system. The fire extinguishing liquid flows from the secondary side 7 of the open valve 6 to the secondary piping 5 and the sprinkler head 4, passes over the orifice 43, and flows down into the drain pipe 44. When the extinguishing liquid exceeds the orifice 43, the starting valve 2
4 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 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 in the primary side 8 of the open valve 6 in each warning area enters the cylinder chamber 20 through the small hole 19, and is pushed through the valve body by the liquid pressure of the pressurized liquid feeding device 13 and the spring 18. 15 closes the valve seats 14a and 14b, and this valve body 15
is in a monitoring state. Since the secondary side 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 to the pipes 31 and 32 via the secondary side 7 by pressurizing means such as a pressure air tank (not shown). Piping 3
Since the pressure liquid flowing into the pressure liquid 2 is throttled by the orifice 33 and flows into the secondary pipe 5, the liquid pressure gradually increases, and the water hammer phenomenon (abnormal pressure increase) due to this flow does not occur.

The pressure liquid flowing into the pipe 32 flows into the pressure regulating chamber 30 via the pipe 31, and when the liquid pressure on the secondary side 7 exceeds the set pressure of the pressure regulating pilot valve 21, the pressure liquid in the pressure regulating chamber 30 The flam 29 and the pressure regulating valve body 28 are pushed downward, the pressure regulating valve seat 26 is closed, the liquid in the operation chamber 17 stops draining, and the spring 18 pushes the valve body 1
5 closes the valve seats 14a and 14b. When the fluid pressure on the secondary side 7 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 opens, and the pressure fluid in the cylinder chamber 20 is discharged through the operation chamber 17. The valve body 15 is pushed by the hydraulic pressure on the primary side 8, and the valve seats 14a, 14
b is opened, the extinguishing liquid on the primary side 8 is introduced into the secondary side 7, and the hydraulic pressure on the secondary side 7 is restored. The pressure will be reduced to the predetermined pressure required for firefighting activities. Because it is restricted by the orifice 33, the secondary side 7 before the piping 32, the piping 31,
The hydraulic pressure in the pressure regulating chamber 30 and the like increases immediately when the release valve 6 is opened, and the valve body 15 is closed, so that the degree of opening of the valve body 15 is small. Therefore, the pressure regulating operation by the pressure regulating pilot valve 21 is sufficiently performed before the liquid pressure in the secondary side pipe 5 rises abnormally, and from this point of view as well, the water hammer phenomenon can be reliably suppressed.

[0025] The hydraulic pressure in the secondary piping 5 is controlled by the pressure regulating pilot valve 2.
When the preliminary pressure becomes lower than the above predetermined pressure due to the pressure adjustment in step 1,
The electric part 42 is operated by the pressure switch 40 and the bypass valve 34 is opened, and the pressure liquid on the secondary side 7 of the release valve 6 is not throttled from the piping 35 that bypasses the orifice 33 and the bypass valve 34 to the secondary side piping 5. will be introduced in Bypass valve 34
The hydraulic pressure applied to the secondary side piping 5 when the bypass valve 34 is opened is a small difference between the regulated hydraulic pressure and the hydraulic pressure in the secondary side piping 5 that has increased to the preliminary pressure, and there is an abnormal pressure increase due to the opening of the bypass valve 34. teeth,
Extremely small. When the temperature at the fire point further increases, the sprinkler head 4 opens and the extinguishing liquid in the secondary piping 5 is released, and a large drop in liquid pressure in the secondary piping 5 is detected by a pressure air tank (not shown) or the like. When this occurs, the pump 10 of the pressurized liquid delivery device 13 is activated and this discharge continues until the fire is extinguished. Since the secondary piping 5 to the sprinkler head 4 and the like 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.

In addition to the above, this embodiment does not require a compressor for constantly pressurizing the secondary pipe 5 with air like a pre-actuating 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. Incidentally, 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 a major water damage accident that occurs in conventional closed sprinkler fire extinguishing equipment can be prevented. In this first embodiment, the release 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. The illustrated release valve 6 is the cylinder chamber 2
Although the structure is such that the valve is opened when the pressure is reduced to 0, a pressurized release type release valve in which the cylinder chamber is opened when the cylinder chamber is pressurized may also be used.

FIG. 2 is a block diagram showing a second embodiment of the invention. In this second embodiment, the secondary side 7 of the release valve 6
and the secondary side piping 5, and the piping 46 and the two-way orifice valve 4.
7 and connect the small flow liquid passage means A to the two-way orifice valve 4.
Through the small diameter port 49 of No. 7, the specified flow rate liquid passage means C
is caused by the large diameter port 50 of the two-way orifice valve 47,
The second starting means for operating the specified flow rate liquid passing means C is constituted by this two-way orifice valve 47, and the second starting means for operating the specified flow rate liquid passing means C is constituted by this two-way orifice valve 47, and the Except that the switching operation is performed by the electric part 42, this embodiment is the same as the first embodiment shown in FIG. .

In this second embodiment, during monitoring, the small diameter port 4 of the two-way orifice valve 47 is connected to the secondary pipe 5 and the pipe 46.
9 is controlled to a communicating position, and as in the first embodiment,
Under normal conditions, when no fire occurs, the secondary piping system is filled with liquid without pressure. When a fire occurs and the fire detector 1 is activated, the release valve 6 is opened by operating the same parts as in the first embodiment. The pressure fluid from the pipe 46 is throttled by the small diameter port 49 and flows into the secondary pipe 5, so the fluid pressure gradually increases, and the water hammer phenomenon due to this inflow does not occur, and the small diameter port 49, the liquid pressure in the secondary side 7, the pipe 31, the pressure regulating chamber 30, etc. before the pipe 46 increases immediately when the release valve 6 is opened, and the valve body 15 is closed. Therefore, the opening degree of the valve body 15 becomes smaller and the pressure regulating pilot valve 2 is closed before the fluid pressure in the secondary side piping 5 rises abnormally.
The above-mentioned pressure regulating operation according to No. 1 is carried out satisfactorily, and from this point of view as well, the water hammer phenomenon can be reliably suppressed.

The hydraulic pressure in the secondary piping 5 is controlled by the pressure regulating pilot valve 2.
When the preliminary pressure becomes lower than the above predetermined pressure due to the pressure adjustment in step 1,
The electric part 42 is operated by the pressure switch 40, and the large-diameter port 50 is connected to the secondary pipe 5 and the pipe 46 at a position where the large diameter port 50 communicates with the secondary pipe 5 and the pipe 46.
The orifice valve 47 is rotationally controlled, and the pressure liquid on the secondary side 7 of the open valve 6 is introduced from the large diameter port 50 into the secondary side piping 5 without being throttled. The hydraulic pressure applied to the secondary piping 5 at the time of opening is a small difference between the regulated pressure and the hydraulic pressure in the secondary piping 5, which has already increased to the preliminary pressure. The pressure increase is extremely small.

Therefore, in this second embodiment as well, initially the small diameter port 49 suppresses a sudden increase in the fluid pressure in the secondary pipe 5, and when the switch is made to the large diameter port 50, the pressure increase is only slight. In addition to the main effect that the water hammer phenomenon does not occur, since the secondary piping 5 to the sprinkler head 4 etc. is filled with extinguishing liquid at a predetermined pressure, the opening operation of the sprinkler head 4 At the same time, the extinguishing liquid is released, there is no delay in the extinguishing operation, and this embodiment does not require a compressor to constantly pressurize the secondary piping 5 with air like a pre-actuating type. The liquid pressure in the secondary side piping system such as the sprinkler head 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 components of this secondary side piping system is sufficient. It has the same effect as the first embodiment, in that it is a sprinkler fire extinguishing system that requires only a small amount of water, does not cause damage to equipment components due to high-pressure liquid as in the past, and can also reduce equipment costs. This has the special effect that the small flow rate liquid passage means A and the specified flow rate liquid passage means C can be simply constructed by one two-way orifice valve 47. FIG. 3 is a block diagram showing a third embodiment of the invention. In this third embodiment, the specified flow rate liquid passing means C is provided by a pipe 53 that communicates the secondary side 7 of the open valve 6 with the secondary side pipe 5, and the small flow rate liquid passing means A is provided by the primary side pipe 16. On the other hand, a pipe 54, a bypass valve 55, and an orifice 56 are connected between the primary pipe 16 and the secondary pipe 5 so as to bypass the release valve 6 and the pipe 53. The first starting means for operating the means A is the bypass valve 55, and the second starting means for operating the specified flow rate liquid passing means C is the starting valve 24.
The bypass valve 55, which is closed during monitoring, is opened when the fire detector 1 detects a fire, and the pressure switch detects that the hydraulic pressure in the secondary pipe 5 has increased to the preliminary pressure. By the operation of 40, the bypass valve 55
This embodiment is the same as the first embodiment shown in FIG. 1, except that the starting valve 24 is opened at the same time as the start valve 24 is closed. Therefore, the same reference numerals are given to the constituent members that can be used in common, and the explanation of the structure is omitted. did.

In this third embodiment, the bypass valve 55 is closed during monitoring, and as in the first embodiment, the secondary piping system is filled with liquid without pressure in the normal state when no fire occurs. . When a fire occurs and the fire detector 1 is activated, the bypass valve 55 is opened and the pressure liquid in the primary pipe 16 is throttled by the orifice 56 and flows into the secondary pipe 5, so that the liquid pressure gradually decreases. Therefore, the water hammer phenomenon due to this inflow does not occur.

[0032] The hydraulic pressure in the secondary piping 5 is controlled by the pressure regulating pilot valve 2.
When the preliminary pressure becomes lower than the predetermined pressure due to the pressure adjustment in step 1,
The pressure switch 40 outputs a command to its electric part 57 to close the bypass valve 55 via the receiver panel 3, and
The electric unit 41 is commanded to open the starting valve 24. As a result, the pressure liquid in the operation chamber 17 is drained and the release valve 6 is opened as described above, and the pressure liquid in the primary side piping 16 is drained from the release valve 6.
It passes through the pipe 53 and is introduced into the secondary pipe 5 without being throttled. The hydraulic pressure applied to the secondary side piping 5 when the release valve 6 is opened is the hydraulic pressure on the primary side 8 and the hydraulic pressure on the secondary side piping 5, which has already increased to a preliminary pressure by filling with liquid through the orifice 56. Therefore, the abnormal pressure increase due to opening of the release valve 6 is extremely small. The closing command of the bypass valve 55 and the opening command of the starting valve 24 may be performed by a timer (not shown) after the detection operation of the fire detector 1.

This third embodiment initially has an orifice 56.
The main effect is that a sudden increase in the fluid pressure in the secondary piping 5 is suppressed by introducing the pressure fluid through the valve 6, and when the release valve 6 is opened, the pressure increase is small and no water hammer phenomenon occurs. In addition, since the secondary piping 5 to the sprinkler head 4 etc. is filled with fire extinguishing liquid at a predetermined pressure, the sprinkler head 4
The fire extinguishing liquid is released at the same time as the opening of the pipe, so there is no delay in the fire extinguishing action, and this embodiment eliminates the need for a compressor to constantly pressurize the secondary piping 5 with air like a pre-actuating type. The liquid pressure in the secondary piping system such as the side piping 5 and the sprinkler head 4 is regulated to a lower pressure than the primary side 8 by the pressure regulator R, so the pressure resistance of the equipment components of the secondary piping system is reduced. - It has the same effect as the first embodiment, in that it is sufficient to have a sufficiently low pressure, and the sprinkler fire extinguishing equipment does not cause damage to equipment components due to high-pressure liquid as in the past, and can also suppress equipment costs. In addition, it has a special effect in that the small flow rate liquid passing means A and the specified flow rate liquid passing means C can be easily constructed by the bypass valve 55, the orifice 56, and the piping 53.

FIG. 4 is a block diagram showing a fourth embodiment of the invention. In this fourth embodiment, a terminal drain valve 59 is connected to the terminal of the secondary piping 5, and the opening operation of the terminal drain valve 59, which is closed during monitoring, is electrically operated by the fire detected by the fire detector 1. 60, and when the pressure switch 40 detects that the hydraulic pressure in the secondary pipe 5 has increased to the preliminary pressure, the terminal drain valve 5 is activated.
9 is closed and the starting valve 24 is opened as in the third embodiment shown in FIG. The explanation of its structure has been omitted. still,
When filling the secondary piping system with unpressurized fire extinguishing liquid, open the terminal drain valve 59 and gradually open the gate valve 9 until the extinguishing liquid has exceeded the terminal drain valve 59. If this terminal drain valve 59 is closed, the liquid is filled without being pressurized. In addition, the above-mentioned closing timing of the terminal drain valve 59, which is opened by the operation of the fire detector 1, is changed to the time when the release valve 6 is opened (
If this is configured to be performed (according to a command from the pressure switch 39), the effect of alleviating the increase in hydraulic pressure by the terminal drain valve 59 when inflowing from the bypass valve 55 becomes even more reliable.

In this fourth embodiment, when a fire occurs and the fire detector 1 is activated, the bypass valve 55 and the terminal drain valve 5 are activated.
9 is opened, and the pressure liquid in the primary pipe 16 flows through the orifice 56.
The fluid is throttled and flows into the secondary piping 5, and its pressure gradually increases.The water hammer phenomenon caused by this inflow is suppressed, and the pressure fluid is discharged from the secondary piping 5, so it is bypassed. Inflow from the valve 55 can be carried out with peace of mind. In addition, by providing an end drain valve 59 similar to that in the fourth embodiment at the end of the secondary pipe 5 in the first to third embodiments, liquid filling is performed without being pressurized, and the bypass valve Effects similar to those of the fourth embodiment can be obtained, such as the effect of alleviating the increase in hydraulic pressure when flowing in from 55 is more reliable.

[0036] Also in this fourth embodiment, the orifice 56 was initially
In the third embodiment, a sudden increase in the liquid pressure in the secondary piping 5 is suppressed by introducing the pressure liquid through the opening, and when the release valve 6 is opened, the pressure increase is small and the water hammer phenomenon does not occur. In addition to the same main effects as in the example, the increase in fluid pressure caused by the inflow from the bypass valve 55 is released to the atmosphere by the terminal drain valve 59.
It has a special effect of easing the fire, and since the secondary piping 5 of the sprinkler head 4 etc. is filled with extinguishing liquid at a predetermined pressure, the extinguishing liquid is released at the same time as the sprinkler head 4 opens. There is no delay in fire extinguishing operation, and this embodiment does not require a compressor to constantly pressurize the secondary piping 5 with air like a pre-actuating type, and the secondary piping 5, sprinkler head 4, etc. Since the fluid pressure in the downstream piping system is regulated to a lower pressure than the primary side 8 by the pressure regulator R, the pressure resistance grade of the equipment components of this secondary piping system is sufficient to be low enough, and conventional This embodiment has the same effect as the first embodiment, in that the sprinkler fire extinguishing equipment does not cause damage to equipment members due to high-pressure liquid and can also suppress equipment costs. In each of the above embodiments, the secondary piping 5 etc. is filled with unpressurized extinguishing liquid for fire monitoring, but as in the fourth embodiment, the terminal of the secondary piping 5 is connected to a normal liquid drain valve. As a result, the secondary side may be pressurized to a slight pressure, and in that case, leakage of the secondary side piping 5 or sprinkler head 4
It is possible to detect the opening of Further, as the fire detection means, although the fire detector 1 is used in each embodiment, it is also possible to use running water or an electrical contact by contact with water that detects the opening operation of the sprinkler head 4.

[0037]

As described above, according to the present invention, the first activation means 24, 55 is activated based on the detection signal of the fire detection means 1.
As a result, the small flow liquid passing means is operated, and the liquid pressure in the secondary piping system such as the sprinkler head and secondary side piping is gradually increased by the small flow liquid passing means, and after this, the specified flow liquid passing means is activated. The flow rate necessary for extinguishing the fire is ensured. As a result, when a fire is detected, the amount of fluid passed is initially limited by the small flow fluid passing means, and after this, the pressure increase value due to the operation of the specified flow fluid passing means becomes a smaller value than the fluid pressure caused by the small flow fluid passing means. hand,
The occurrence of water hammer phenomenon is suppressed. Therefore, when the release valve 6 is opened, the extinguishing liquid whose pressure has been adjusted to be reduced by the pressure regulator R is supplied to the secondary piping system, and it is sufficient that the pressure resistance grade of the components of the secondary piping system is sufficiently low. The sprinkler fire extinguishing equipment is now capable of reducing equipment costs without causing damage to equipment components due to the high-pressure fluid used in the past.

From the small flow rate liquid passing means A to the specified flow rate liquid passing means C
second activation means 34, 47, 2 for switching to
4 is a pressure detection device 40 that monitors the liquid pressure in the secondary pipe 5;
Since the water hammer phenomenon is activated by the detection signal, the water hammer phenomenon can be prevented without error.

The valves 24, 34, 47, 55 constituting either or both of the first starting means 24, 55 or the second starting means 34, 47, 24 are
1, 42, 57 accurately and easily.

The small flow rate liquid passing means A is the specified flow rate liquid passing means C.
It can be easily constructed by mainly having orifices 33 arranged in parallel with each other.

The small flow rate liquid passage means A and the specified flow rate liquid passage means C are connected to a small diameter port 49 and a large diameter port operated by the electric part 42.
Since the main body is the valve 47 having the opening 50, it can be constructed with a small number of members.

[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.

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

FIG. 4 is a block diagram showing a fourth embodiment of the invention.

[Explanation of symbols]

1 Fire detector (fire detection means) 4
Sprinkler head 5 Secondary piping 6 Release valve 13 Pressurized liquid feeding device (extinguishing liquid supply means) 16
Primary side piping 21 Pressure regulating pilot valve (pressure regulating device R) 24
, 34, 47, 55 Starting means (valve) 33
Orifice 40 Pressure switch (pressure detection device) 41,
42, 57 Electric part 49 Small diameter port 50 Large diameter port A Small flow rate liquid passage means C Specified flow rate liquid passage means

Claims (5)

[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 the sprinkler head, and the release valve is normally closed, but is opened by a signal based on a fire detection means that detects a fire phenomenon. Sprinkler extinguishing In the equipment, when the release valve is in the open state, it has a pressure regulating device that reduces the pressure of the extinguishing fluid in the primary piping to a predetermined pressure and supplies it to the secondary piping. A small flow liquid passage means for passing liquid at a small flow rate through the piping, a prescribed flow liquid passage means for passing the fire extinguishing liquid in the primary side piping at a specified flow rate through a release valve into the secondary side piping, and these liquid passage means. The first starting means operates the small flow liquid passing means based on the detection signal of the fire detection means, and then the second starting means operates the small flow liquid passage means. Sprinkler fire extinguishing equipment characterized by switching to flow rate means. 2. The sprinkler fire extinguishing equipment according to claim 1, wherein the second activation means is activated by a detection signal from a pressure detection device that monitors the hydraulic pressure of the secondary piping. 3. The sprinkler fire extinguishing equipment according to claim 1, wherein the first and/or second activation means are electric valves. 4. The sprinkler fire extinguishing equipment according to claim 1, wherein the small flow rate liquid passing means is mainly composed of an orifice arranged in parallel with the specified flow rate liquid passing means. 5. The sprinkler according to claim 1, wherein the small flow rate liquid passing means and the specified flow rate liquid passing means are mainly composed of an electric valve having two ports of a small diameter and a large diameter. Fire extinguishing equipment.