JP2746139B2 - Fire detection system and fire detection head for automatic 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 fire detection system for an automatic fire extinguishing system using a pressure reducing type simultaneous release valve, and a detection head used in the fire detection system.

[0002]

2. Description of the Related Art Conventionally, there has been an automatic fire extinguishing system using a pressure reducing simultaneous open valve as a fire extinguishing system for a parking lot or the like. The structure of the pressure reducing type simultaneous release valve will be described with reference to FIG. 1. First, the simultaneous release valve A has a primary compartment a and a secondary compartment b as shown in FIG. The compartment b is shut off by a valve d. A control chamber c having a cylinder c1 is provided above the primary compartment a, and the control chamber c and the primary compartment a are provided with a piston c2 formed integrally with the valve element d.
Is blocked by However, the primary partition a and the control chamber c are connected by an orifice e, and a ball valve e1 is provided in the orifice e so as to block the flow of fluid from the control chamber c to the primary partition a. Accordingly, the fluid in the primary compartment a flows into the control chamber c, but the fluid does not flow from the control chamber c into the primary partition a. Control room c
Communicates with the outside through the connection port c3. A shaft f for fixing the piston c2 at the lower position is screwed into the upper part of the control chamber c, and the piston c2 is pressed downward by a spring, that is, valve closing means c4.

An automatic fire extinguishing system using the simultaneous opening valve A having such a structure is generally configured as shown in FIG. That is, the primary compartment a of the simultaneous opening valve A is connected to a mixer (not shown) connected to the foaming tank and the water supply pump, and the foam fire extinguishing liquid is supplied. Connected to a foam head (not shown) for fire extinguishing,
It is open to the atmosphere through the foam head. The control room c of the simultaneous opening valve A is connected to a plurality of closed-type sprinkler heads D through a pipe E having a manually operated valve B to constitute a fire detection system.

[0004] The operation of the automatic fire extinguishing system will be described below. First, the shaft f of the simultaneous opening valve A is rotated down to fix the piston c2 of the simultaneous opening valve A at the lower position. In this state, the foam fire extinguishing liquid is supplied to the primary compartment a of the simultaneous opening valve A from the mixer side. The foam then fills the primary compartment a,
Further, it flows into the control chamber c through the orifice e, and further fills the pipe E and the sprinkler head F through the connection port c3. In this state, the inflow of the foam fire-extinguishing liquid stops, and the pressures in the simultaneous opening valve A and the pipe E become constant.
The simultaneous release valve A is designed such that the force that pushes down on the piston c2 in this state from the control room c2 side is about twice as high as the force that pushes up from the primary compartment a side. Therefore, even if the shaft f is not rotated and the piston c2 is pressed by the shaft f, the difference in the applied force causes the piston c2 to press the valve body downward. Therefore, in this state, if the shaft f is rotated and raised to enable the piston c2 to move upward, the fire can be automatically extinguished.

[0005] When a fire occurs in this state, the sprinkler head D is opened by the tip of the sprinkler head flying due to the heat of the fire, and the foam in the pipe E flows out from the sprinkler head D to the pressure inside the pipe E. Decrease. Thereby, the pressure in the control chamber c of the simultaneous opening valve A also decreases,
The force that pushes down the piston c2 from the control room c side,
The force is smaller than the force for pushing the piston c2 upward from the primary compartment a side. At this time, the foam fire extinguishing liquid flows into the control chamber from the primary compartment due to the orifice E. However, since the inner diameter of the orifice E is very small, the speed is low enough to alleviate the pressure drop in the control chamber c. Therefore, the foam cannot flow into the control room from the primary compartment. That is, the piston c2 is pushed upward, the valve element d is opened, the primary compartment a communicates with the secondary compartment b, and the foam fire extinguishing liquid flows into the secondary compartment b and the fire extinguishing target flows from the foam head. Injected to.
Then, the flow of the foam fire extinguishing liquid is detected by a sensor (not shown), and when the flow of the foam fire extinguishing liquid is detected, a water supply pump (not shown) is operated and the foam fire extinguishing liquid is continuously supplied and continuously jetted from the foam head, Extinguish fire.

[0006]

The conventional automatic fire extinguishing system has the above-mentioned configuration, but has the following disadvantages because the fire detection system uses a closed sprinkler head. Have.

Since the closed type sprinkler head is usually used alone as a fire extinguishing head, the closed type sprinkler head is required to have both a fire detecting function and a function as a fire extinguishing outlet. . For this reason, the closed type sprinkler head is very easy to spout water due to its structure. That is, the closed type sprinkler head has a structure in which a high water pressure is always applied to the sealing portion at the tip and has a structure in which the sealing portion is pressed by a stopper using a metal having a low melting point. When an impact is applied to the tip, the stopper that presses the sealing portion shifts or breaks, and the sealing portion to which high water pressure is applied is easily opened and water is generated. Then, when the sprinkler head emits water, the simultaneous release valve is activated and the foam fire extinguishing liquid is jetted from all the foam heads. Also, the tip of the closed sprinkler head is usually exposed because a fire must be sensed. In other words, the tip of the closed-type sprinkler head is vulnerable to impact despite being vulnerable to impact, etc.
There have been many accidents in which if a shock is applied to the tip of the sprinkler head due to carelessness or the like, the automatic fire extinguishing system will be activated, causing severe water damage. Further, the closed type sprinkler head is also weak against a water hammer, and there has been an accident that the sprinkler head generates water when filling the pipe with water.

In addition, even if the conventional automatic fire extinguishing equipment operates normally, once the simultaneous opening valve is operated, the fire extinguishing liquid is continuously injected unless the manually operated valve is manually closed by a person. And fires occur when you are unattended,
Even if there is a person, the room with the manually operated valve or the pump room is often locked or the method of stopping water is not known in many cases. In such a case, the fire extinguishing liquid continues to be injected even after the fire is extinguished, resulting in a large water loss. In fact, in an automatic fire extinguishing system, the damage caused by water damage often accounts for a large portion of the total damage caused by fire.

The present invention has been made in order to solve such a problem. Instead of using a fire detection unit such as a sprinkler head originally designed to extinguish a fire independently, a dedicated fire opening valve is used. The automatic fire extinguishing system does not operate accidentally even if a physical stimulus such as an impact is applied to the fire detecting head by automatically developing a fire detecting system. The purpose is to realize an automatic fire extinguishing system that is wet.

[0010]

In order to achieve the above object, a fire detection system for an automatic fire extinguishing system according to the present invention comprises a pipe connected to a control room of a pressure reducing type simultaneous release valve, and a fire connected to the pipe. A fire detection system constituted by a detection head, wherein the fire detection head includes a valve chamber and the valve chamber.
Completely composed of a separate independent sensing portion, the valve chamber has a valve body which closes the flow to the atmosphere from the pipe side, the sensing unit includes an actuator which expands and contracts in response to the rise and fall of temperature, the The actuator extends to contact the valve body of the valve chamber
And a valve body opening means for opening the valve body .

It is conceivable to use a cylinder having a cylinder and a piston and having a sensing section filled with a liquid having an appropriate boiling point connected to the cylinder as an actuator of the actuator section in the fire detection head.
That is, the fire detection head is constituted by a valve chamber and a sensing section, and the valve chamber includes a pipe mounting port and a valve body that communicates with the atmosphere and shuts off the flow to the atmosphere side, and the sensing section includes a container body encapsulating liquid, a cylinder coupled to the opening of the container body, and become more actuator piston which engages the said cylinder, a valve body of the valve chamber in conjunction with the piston of the actuator Setto It is conceivable to use a fire detecting head constituted by a valve body opening means that opens by the above.

Alternatively, a shape memory alloy that elongates in response to a rise in temperature may be used as an actuator of a sensing unit in the fire sensing head. That is, the fire detection head is constituted by a valve chamber and a sensing section, and the valve chamber is constituted by a pipe mounting port and a valve body that communicates with the atmosphere and shuts off the flow to the atmosphere side. It is conceivable to use a fire detecting head comprising an actuator formed of a shape memory alloy which expands in response to a rise in temperature, and a valve body opening means for opening the valve body of the valve chamber by abutment by the expansion of the actuator. Can be

In the actuator using the shape memory alloy, it is desirable to provide a pressing means for applying a force in a direction to compress the elongated shape memory alloy.

[0014]

In the fire detecting system having the above structure, only the detecting portion of the fire detecting head needs to detect heat, and this detecting portion is completely separated from the valve chamber in the fire detecting head.
It is an independent component, and the water pressure in the pipe is received by the valve chamber of the fire detection head to prevent water from being generated. Therefore,
Even if the sensing unit is inadvertently damaged, the valve room will not
Little or no opening operation in response to
It is.

When the fire detecting head is heated by the heat from the fire, the actuator is actuated and the valve body of the valve chamber is opened by the valve body opening means. That is, the pipe is opened to the atmosphere and the water in the pipe is discharged.

When the fire has subsided, the sensing portion of the fire sensing head cools down, the actuator shrinks, the valve body opening means releases the valve body, and the valve body is closed by the fluid pressure in the piping. As a result, the pipe is closed again, and the pressure in the pipe increases, and eventually the pressure in the pipe and the pressure in the control chamber of the simultaneous release valve become equal to the pressure in the primary chamber and the secondary chamber of the simultaneous release valve. In this state, the forces applied to the integrally formed piston and the valve element in the simultaneous release valve by the water pressure are equal in both the direction in which the valve element is closed and the direction in which the valve element is opened. However, since the valve body of the simultaneous release valve is generally pressed in the closing direction by the valve closing means, the valve body is closed by the valve closing means. Once the valve is closed,
The flow of the fire extinguishing liquid stops, and the entire automatic fire extinguishing system becomes the same as the first steady state.

If the fire is not sufficiently extinguished and the fire reignites again, the pipe is opened by the same operation as described above, and when the fire is extinguished again, the simultaneous opening valve is closed by the same operation as above and the entire automatic fire extinguishing equipment is initially operated. Is the same as the steady state.

If a sensor having a cylinder and a piston as an actuator of a sensing part of the fire sensing head and a sensing part filled with a liquid having an appropriate boiling point is connected to the cylinder, the liquid is evaporated by the heat of the fire. Then, the gas expands and pushes out the piston, and the valve body of the valve chamber is opened by the valve body opening means.If the fire stops, it cools and condenses and returns to liquid, so the volume is reduced and the piston is retracted and the valve is retracted. The body opening means is separated from the valve body of the valve chamber, and the valve body is closed.

Further, if a shape memory alloy which expands in response to a rise in temperature is used as an actuator of the sensing portion of the fire sensing head, the valve body of the valve chamber is opened by the valve body opening means which expands at a high temperature.

By providing a pressing means for applying a force in the direction of compressing the elongated shape memory alloy, the shape memory alloy loses the force to expand due to a decrease in temperature, and the actuator shrinks by the pressing means, and the valve element is compressed. The opening means is separated from the valve body of the valve chamber, and the valve body is closed.

[0021]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a diagram illustrating an outline of the fire detection system according to the present embodiment. Since the simultaneous release valve A used in this embodiment uses the above-described one, the same reference numerals are used unless otherwise specified. The fire detection system comprises a pipe 1 connected to the control room c of the simultaneous opening valve A and a plurality of fire detection heads 2 connected to the pipe 1. The side not connected to the simultaneous opening valve A of the pipe 1 is connected to the manually operated valve 3, which is normally closed.
The primary compartment a of the simultaneous opening valve A is connected to a mixer (not shown) connected to a foaming tank and a water supply pump, and the secondary compartment b is connected to a plurality of foam heads (not shown). Yes, open to the atmosphere.

The fire detecting head 2 is constituted by a valve chamber 20 and a detecting section 21 as shown in the sectional view of FIG. The valve chamber 20 includes a pipe mounting port 20a and a valve body 20b, and the valve body 20b is formed by a ball valve that communicates with the atmosphere and shuts off the flow toward the atmosphere. However, the valve body 20
b is not limited to a ball valve as long as it communicates with the atmosphere and shuts off the flow toward the atmosphere. The ball body of the ball valve is pressed toward the closing side by a spring. The sensing unit 21 includes a valve body opening means 21a for opening the valve body 20b by pressing the ball body of the valve body 20b, and an actuator 21
The actuator 21b is connected to the valve body opening means 21a and is interlocked with the piston 21c, the cylinder 21d engaged with the piston 21c, and the liquid connected to the cylinder 21d. 21
e is enclosed by a container 21f. Although the valve body opening means 21a is a simple rod-shaped body in the present embodiment, the valve body 2 is linked to the movement of the actuator 21b.
Any type that can release 0b can be adopted. The liquid 21e has a vapor pressure characteristic at about 72 ° C. that gives the piston 21c a force such that the valve opening means 21a pushes down the ball of the valve 20b. The container 21e is connected to the cylinder 21c without a gap.
The space surrounded by f, the cylinder 21d, and the piston 21c is completely sealed. The piston 2
1b is pressed toward the container body 21e by a pressing spring 21g.

Since the fire detecting head 2 according to the present embodiment has the above-described configuration, even if the detecting section 21 receives an impact, no water is emitted. That is, unlike the conventional sprinkler head, which is a structure in which the water is suppressed by a stopper which is barely integrated with the fire detecting portion at the tip, the foam fire-extinguishing liquid in the pipe 1 uses the valve in the valve chamber 20. The outflow is stopped by the body 20b, and the valve chamber 20 that stops the outflow is completely separated from the sensing unit 21, so that even if the sensing unit 21 is eliminated, no water is generated. Then, the actuator 21b of the sensing unit 21 is operated only by heat, and as shown in FIG.
, Whereby the fire extinguishing liquid in the pipe 1 can only flow out. However, if the valve chamber 20 is destroyed by a physical impact, a water accident may occur. However, since the sensing unit 21 and the valve chamber 20 are separated from each other, the valve chamber 20 has any rigid structure. It is possible,
Further, since the valve chamber 20 does not need to be exposed to detect a fire, it can be protected by a cover or the like. On the other hand, the sensing part and the water stopping part are integrated at the tip part like a conventional sprinkler head, so if it is made too strong, it will not be possible to emit water at the time of fire, and this tip part will sense fire. It will not work if it is covered with a cover or the like.

Next, the operation of the fire detection system having the above-described configuration having such a fire detection head will be described below. First, foam fire extinguishing liquid supplied from the primary compartment a of the simultaneous opening valve A is supplied to the primary compartment a and the control room b of the simultaneous opening valve A, the pipe 1, the fire detection head, and the like as in the conventional automatic fire extinguishing equipment. The second valve chamber 20 is filled. In this state, the valve body d of the simultaneous release valve A is the piston c2 from the control chamber c side.
It is closed by the pressure on. Then, when a fire occurs in this state, the container 21e of the fire detecting head 2 is heated by the flame of the fire, and the liquid 21e sealed in the container 21e starts to evaporate. Eventually, when the temperature reaches a predetermined temperature, the expansion of the evaporated liquid 21e pushes down the piston 21c of the fire detecting head 2 to a state as shown in FIG. 5, and the valve body opening means 21a interlocked with this causes the valve body 20b of the valve chamber 20 to move. Push down the ball body that constitutes.
As a result, the valve body 20b is opened, water in the pipe 1 is released, the pipe 1 is opened to the atmosphere, and the water pressure in the pipe 1 is rapidly reduced. Then, the water pressure in the control chamber c of the simultaneous opening valve A connected to the pipe 1 is also drastically reduced, and the high water pressure in the primary compartment a pushes up the piston c2 in the control chamber c, so that the valve body d of the simultaneous opening valve A is raised. The fire extinguishing liquid is opened and the fire extinguishing liquid is injected from the foam head through the secondary compartment b of the simultaneous opening valve to extinguish the fire.

When the fire subsides, the temperature drops and the temperature of the vaporized liquid 21e in the container 21f of the fire detecting head 2 and the cylinder 21d also drops. Then, the vaporized liquid 21 starts to condense and the volume decreases, and the piston 21
c moves up. This upward movement is urged by a pressing spring 21g that presses the piston 21c. When the piston 21c moves upward, the valve body opening means 21a which is connected to the piston 21c and moves in conjunction therewith also moves upward, and the ball constituting the valve body 20b of the valve chamber 20 is released from the restraint by the valve body opening means 21a. Therefore, the ball is moved upward by the water pressure in the pipe 1 and the force of the spring pressing the ball, and the valve 2 in the valve chamber 20 is moved.
0b is closed as shown in FIG. As a result, the inside of the pipe 1 is again shut off from the atmosphere, and the control chamber c, the orifice e from the primary compartment a of the simultaneous release valve A,
The water pressure in the control room c and the pipe 1 rises due to the foam fire extinguishing liquid flowing into the pipe 1. Eventually, the water pressure in the control room c becomes the primary compartment a
And the water pressure in the secondary compartment b. In this state, the force applied to the piston c1 and the valve body d formed integrally with the simultaneous release valve A is different from the initial state, and water pressure is also applied to the lower surface of the valve body d. And valve body d
In both directions. However, since the piston c2 is pressed downward by the valve closing means c4, the valve element d moves in the closing direction by the force of the valve closing means c4. When the valve element d is closed, the primary compartment a and the control chamber c of the simultaneous opening valve A are cut off from the atmosphere, and the pressure in the primary compartment a and the control chamber c increases, while the secondary compartment b is a bubble head. And the pressure in the secondary compartment b is reduced because there is no inflow of the foam. As a result, the piston c2 moves down, the valve element d closes, and the primary compartment a and the control chamber c of the simultaneous opening valve A return to the initial state and become stable. Then, since the foam fire extinguishing liquid does not flow into the secondary compartment b, the injection of the foam fire extinguishing liquid from the foam head is stopped.

Furthermore, in an actual fire, the fire often reignites even after the fire is once extinguished. In such a case, the fire detection system according to the first embodiment can cope. That is, since the fire detection system has all returned to the initial state after the extinguishing, it is possible to extinguish the fire by repeating the above-described operation even for the re-flamed flame. Then, when the fire is extinguished again, the injection of the foam fire extinguishing liquid is stopped as described above and the state returns to the initial state.

In other words, the automatic fire extinguishing system using the fire detection system according to the present embodiment repeats sprinkling and stopping of the fire extinguishing liquid until the fire is completely extinguished. Losses can be minimized.

In this embodiment, the sensing head is used in the upward state. However, when the ceiling is not extended, the temperature is highest at the uppermost portion. When the ceiling is extended, the sensing head is oriented downward. In this case, the operation is not changed, and in this case, if only the sensing part of the sensing head is exposed from the ceiling, it is effective to prevent the occurrence of water due to an accident.

(Embodiment 2) Next, another embodiment of the present invention will be described. FIG. 6 is a diagram illustrating an outline of the fire detection system according to the present embodiment. The configuration of the fire detection system according to the present embodiment is substantially the same as that of the first embodiment, and includes a pipe 1 connected to the control room c of the simultaneous opening valve A and a fire detection head 2 connected to a plurality of pipes 1. is there. The pipe 1 is connected to a manually operated valve 3 which is normally closed, and the primary compartment a of the simultaneous opening valve A is connected to a mixer (not shown) connected to a foaming tank and a water pump. The secondary compartment b is connected to a plurality of foam heads (not shown) and is open to the atmosphere.

FIG. 7 is a sectional view of the fire detecting head 2 according to this embodiment. The fire detecting head 2 is also constituted by a valve chamber 20 and a detecting section 21. The valve chamber 20 is the same as the fire detecting head 2 of the first embodiment.
The valve body 20b is formed by a ball valve that communicates with the atmosphere and shuts off the flow toward the atmosphere, and the ball body of the ball valve is pressed to the closing side by a spring.

The sensing unit 21 includes an actuator 21b,
In cooperation with the actuator 21b, a valve body opening means 21a for opening the valve body 20b by pressing the ball of the valve body 20b, and a pressing means 21h for pressing the actuator 21b. The actuator 21b is made of a shape memory alloy formed in a coil shape, and is formed so as to be in a contracted state at normal temperature as shown by a solid line in the drawing and to be expanded at about 72 ° C. as shown in FIG. It is a thing. That is, the actuator 2
1b can expand with increasing temperature. The pressing means 21h is a compression spring that applies a force in the direction of contracting the actuator 21b when the actuator 21b expands, and cannot stop the force of the actuator 21b to expand at a predetermined temperature. Is capable of generating a force that can be contracted.

The fire detecting head 2 according to the present embodiment also has a valve chamber 20 and a detecting section 2 similarly to the fire detecting head according to the first embodiment.
Since 1 is completely separated, the sensing section 21 does not emit water even if it receives an impact, and the valve chamber 20 can have a strong structure or can be protected by a cover or the like.

The fire detection system having the above configuration having the fire detection head 2 operates almost in the same manner as the fire detection system according to the first embodiment. This operation will be described below. First, the state of the first automatic fire extinguishing system is the same as that of the first embodiment. The primary compartment a of the simultaneous opening valve A, the control room c, the pipe 1, and the valve chamber 20 of the fire detecting head 2 are filled with the foam. It is. When a fire occurs in this state, the sensing unit 21 of the fire sensing head 2 is heated, and when the temperature reaches a predetermined temperature, an actuator 21b made of a shape memory alloy is extended against the pressing means 21h and interlocks with the actuator 21b. The valve body opening means 21a pushes the valve body 20b of the valve chamber 20. Then, the state shown in FIG.
Is opened, the water in the pipe 1 is generated, and the water pressure in the pipe 1 and the water pressure in the control chamber c in the simultaneous opening valve A connected thereto decrease rapidly. After that, the operation is the same as the operation of the general simultaneous opening valve A, and the control room c
Due to the rapid decrease of the water pressure, the balance with the water pressure in the primary compartment is lost, the force of the water pressure in the control chamber c pushing up the piston c2 is weakened, and the piston c2 moves in the direction to open the valve body d of the simultaneous opening valve A, Foam fire extinguishing liquid is changed from primary compartment a to secondary compartment b
Fire is extinguished from the foam head through the fire.

When the fire subsides, the shape memory alloy forming the actuator 21b of the sensing head 2 cools down,
The shape memory alloy undergoes a phase change and becomes soft. Then, the actuator 21b cannot resist the force of the pressing unit 21h pressing in the contracting direction, and is compressed by the pressing unit 21h. That is, when the temperature falls below a certain temperature, the actuator 21b shrinks, and the valve body opening means 21a which is linked to and interlocks with the actuator 21b is
The valve body 20b is separated from the valve body 20b inside the pipe 0 again by the water pressure in the pipe 1 and the force of the spring pressing the ball body of the valve body 20b, and the state shown in FIG. Thereafter, the same operation as in the first embodiment is performed, and when the valve body 20b of the sensing head 2 is closed, the water pressure in the control chamber c of the pipe 1 and the simultaneous opening valve A rises, and the primary compartment of the simultaneous opening valve A is opened. a
And the piston 2c formed integrally with the valve body d of the simultaneous opening valve A moves in a direction to close the valve body d by valve closing means c4 that presses downward,
Eventually, the valve element d closes. This stops the injection of the foam, and the entire system of the automatic fire extinguishing system returns to the initial state.

The automatic fire extinguishing system using the fire detection system according to the second embodiment repeats the spraying and stopping of the fire extinguishing liquid until the fire is completely extinguished, and injects the fire extinguishing liquid after the extinguishing, as in the first embodiment. Water loss can be minimized.

In this embodiment, the sensing portion 21 of the sensing head 2 is provided with the pressing means 21h for compressing the extended actuator 21b. However, even without the pressing means 21h, the fire is detected and the simultaneous opening valve A is opened. It is effective compared with a conventional fire detection system using a closed type sprinkler head, since it can be operated and has an effect that a water accident is not easily caused by an impact or the like. Further, even when the sensing head is used downward as in the first embodiment, the operation does not change.

[0037]

The fire detection system and the fire detection head according to the present invention have the following effects by the above-described configuration. First, since the sensing part of the fire detection head is independent and the water is held down by the valve room of the fire detection head, it must be exposed. It does not generate water and the valve chamber does not need to be exposed, so it can be protected from external impacts by building a strong structure or covering it with a cover, also accident that Hatsusui can be easily prevented.

The sensing portion of the fire sensing head has an actuator that expands and contracts in response to a rise and fall in temperature and a valve body opening means that opens a valve body in a valve chamber that is linked to the actuator. The actuator is extended, the valve body opening means opens the valve body of the valve chamber, rapidly lowers the water pressure in the control chamber of the simultaneous opening valve, and opens the simultaneous opening valve,
Fire extinguishing liquid can be sprayed from the foam head to start fire extinguishing.

When the fire subsides and the temperature drops, the simultaneous opening valve automatically closes and the entire automatic fire extinguishing system returns to a steady state, so that the simultaneous opening valve cannot be closed manually. Even if there is a fire, the fire detection system reacts to the re-ignited fire because the automatic fire extinguishing system is in the initial state even if the unburned fire reignites. Since the simultaneous release valve opens to perform automatic fire extinguishing, further fire spread can be prevented.

Further, if a fire sensor having a cylinder and a piston as an actuator of a sensing portion of the fire sensing head and a sensing portion filled with a liquid having an appropriate boiling point connected to the cylinder is used, the temperature rise due to a fire increases the actuator. Is extended to open the valve body of the valve chamber of the fire detection head and drastically reduce the water pressure in the piping.This allows the simultaneous opening valve to operate and extinguish the fire. The valve is closed and the valve body of the valve chamber of the disaster sensing head is closed, whereby the simultaneous opening valve is also closed and the fire extinguishing can be stopped.

If a shape memory alloy which elongates in response to a rise in temperature is used as an actuator of the sensing part of the fire sensing head, the actuator similarly expands at a high temperature due to a fire, and the valve body of the valve chamber is opened by the valve body opening means. Is released, whereby the simultaneous release valve operates to extinguish the fire.

Further, by providing a pressing means for applying a force in the direction of compressing the elongated shape memory alloy, the actuator contracts due to a decrease in temperature, the valve body closes, and the simultaneous release valve closes to stop the fire extinguishing. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a pressure reducing simultaneous release valve.

FIG. 2 is a sectional view showing a conventional fire detection system.
You.

FIG. 3 is a cross-sectional view illustrating the fire detection system according to the first embodiment.

FIG. 4 is a sectional view showing a closed state of the fire detecting head according to the first embodiment.

FIG. 5 is a cross-sectional view showing the fire detection head according to the first embodiment in an open state.

FIG. 6 is a cross-sectional view illustrating a fire detection system according to a second embodiment.

FIG. 7 is a cross-sectional view illustrating a closed state of the fire detection head according to the second embodiment.

FIG. 8 is a sectional view showing an open state of the fire detection head according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Fire detection head 20 Valve room 20a Pipe mounting port 20b Valve 21 Sensing part 21a Valve opening 21b Actuator 21c Piston 21d Cylinder 21e Liquid 21f Container 21g Press spring 21h Pressing means 3 Manual operation valve A Simultaneous release valve B Manually operated valve C Piping D Sprinkler head a Primary compartment b Secondary compartment c Control room c1 Cylinder c2 Piston c3 Connection port c4 Valve closing means d Valve body e Orifice e1 Ball valve

Claims (7)

(57) [Claims] 1. A fire detection system comprising a pipe connected to a control chamber of a pressure reducing type simultaneous release valve, and a fire detection head connected to the pipe, wherein the fire detection head is provided in a valve chamber and the valve chamber. The valve chamber has a valve body that shuts off the flow from the pipe side to the atmosphere, and the sensor section expands and contracts according to the rise and fall of the temperature. Actuator and extension of this actuator
A fire detection system comprising: a valve body opening means for contacting a valve body of a valve chamber to open the valve body. 2. The fire detection system according to claim 1, wherein the detection unit of the fire detection head has a cylinder and a piston, and the cylinder is connected to a container body filled with a liquid. 3. A shape memory alloy which elongates in response to a rise in temperature as a sensing part of the fire sensing head.
The fire detection system as described. 4. The fire detection system according to claim 3, further comprising pressing means for compressing the shape memory alloy in a direction opposite to the direction of extension. 5. A valve chamber and an independent completely separated valve chamber
A fire sensing head constituted by the sensing unit,
The valve chamber includes a pipe mounting port and a valve body that communicates with the atmosphere and closes the flow toward the atmosphere. The sensing unit contacts and opens the valve body of the valve chamber by extending the actuator. Comprising a valve body opening means, a container body in which the actuator is filled with a liquid, a cylinder connected to an opening of the container body, and engaged with the cylinder;
A fire detection head comprising a piston associated with the valve opening means. 6. A valve chamber and an independent completely separated valve chamber.
A fire sensing head constituted by the sensing unit,
The valve chamber includes a pipe mounting port, a valve body communicating with the atmosphere and closing the flow to the atmosphere side, and the sensing unit includes an actuator formed of a shape memory alloy that expands and contracts in response to a rise and fall in temperature . A fire detection head comprising valve body opening means for abutting and opening the valve body of the valve chamber by extension . 7. The fire detecting head according to claim 6, further comprising a pressing means for compressing the shape memory alloy in a direction opposite to an extension direction.