JP2000167080A - Sprinkler head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a shape memorizing alloy for operating a valve to be accurately open at a temperature predetermined for a fire to release extinguishing water. SOLUTION: When a two-way shape memorizing alloy 10 of a first heat sensitive operation part is heated to a predetermined temperature T1, a pilot valve 13 is operated with deformation from a low-temperature shape into a high-temperature shape, so that a spool valve 7a is put in an opening possible condition by an actuator 8. A second heat sensitive operation part 22 sets a predetermined water release starting temperature T2 higher than the predetermined temperature T1 where the shape memorizing alloy is deformed with a fusible alloy 30, which is thermally decomposed for cancelling closing held by a first heat sensitive operating mechanism 6 to release extinguishing water when the water release starting temperature T2 is reached. When the temperature is lowered to the predetermined temperature T1 or less with extinguishment through water release, the shape memorizing alloy 10 is deformed into a low- temperature shape for operating a valve mechanism in a closed condition to stop water release.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fire-extinguishing water by opening a valve when the ambient temperature rises due to a fire and automatically discharging fire extinguishing water, and closing and driving the valve when the ambient temperature falls due to fire suppression. The present invention relates to an automatic opening and closing type sprinkler head for automatically stopping water discharge.

[0002]

2. Description of the Related Art In a conventional sprinkler head, a flow path connecting a water supply port at a head connection part to a fire extinguishing pipe and a water discharge port at a head end is sealed with a heat-sensitive material such as a fusible alloy which can be melted by heat at the time of fire. In addition, when the temperature reaches or exceeds a predetermined temperature, the heat-sensitive material is melted to open the flow path, thereby discharging water.

For this reason, once the flow path is opened by operating the sprinkler head in response to the hot air flow due to the fire, the fire extinguishing water is not supplied from the water supply source even after the fire is extinguished, or a staff member checks the site. Water continued to be released until the valve was manually closed, and the fire water for firefighting was severely damaged.

[0004] Therefore, using a shape memory alloy or the like, the valve is opened when the temperature rises due to a fire and the fire extinguishing water is automatically discharged, and when the temperature falls due to fire suppression, the valve is closed and the water discharge is automatically stopped. Sprinkler heads have been proposed. FIG. 9 shows an example of such an automatic opening / closing type sprinkler head (JP-A-5-123419).
issue).

[0005] The sprinkler head shown in FIG.
A coil spring-like one-way shape memory alloy 12
0, and when the temperature exceeds a specified temperature due to a fire, the shape memory alloy 120 restores the shape of the coil spring stored in advance to the expanded shape, and pushes up the pilot valve body 112 provided on the valve shaft 111 against the spring 113 to raise the pilot valve. Open the valve hole 110. For this reason, the pressure in the room above the piston 108 decreases, the piston 108 rises, the rubber packing 114 separates from the valve seat, and the fire extinguishing water is discharged from the water discharge port 116.

When the fire extinguishes due to the release of fire-extinguishing water and the temperature drops, the shape memory alloy 120 loses its restoring force to the memory shape, and is pushed by the spring 113 to release the pilot valve body 11.
2 is pushed down and the pilot valve hole 110 is closed. For this reason, the pressure of the fire extinguishing water through the pilot introduction hole 104 pushes down the piston 108, and the rubber packing 11
At 4 the valve seat is closed and water discharge is automatically stopped.

[0007]

However, in an automatic opening / closing type sprinkler head using such a shape memory alloy, in the event of a fire, the valve is opened at a predetermined temperature and is operated reliably. There was a problem that it was not possible.

FIG. 10 shows the elastic modulus of a shape memory alloy with respect to temperature, and the restoring force is in a relationship proportional to the elastic modulus.
The shape memory alloy is in a crystalline state of a martensite phase at a low temperature, transitions to a crystalline state of an austenite phase when the temperature increases, and there is a shape memory area known as a two-phase area therebetween. This shape storage area has a width of, for example, several tens degrees or more in the temperature direction.

In order to open the valve in the event of a fire using the shape memory alloy 120 having such characteristics, first, a specified operating temperature T1 for starting water discharge when receiving a hot air flow due to a fire is determined. An elastic coefficient G1 at a point P corresponding to the temperature T1 is obtained. When the elastic coefficient G1 is determined, the restoring force at the operating temperature T1 of the shape memory alloy 120 having a coil spring shape is determined, and the restoring force determines the pilot valve body 112.
The force of the spring 113 is set so as to open.

Then, while being heated to the specified operating temperature T1, the shape memory alloy 120 is deformed into an expanded memory shape, and then returned to room temperature and shrunk to an initial shape before storage, and incorporated as shown in FIG.

However, in the shape memory alloy, as shown in FIG. 10, the elastic modulus gradually increases in the shape memory region with an increase in temperature, and the restoring force to the memory shape gradually increases. On the other hand, the force for opening the pilot valve body 112 varies depending on the pressure of the fire-extinguishing water introduced into the piston chamber 109 and the sliding resistance of the valve shaft 111 in addition to the force of the spring 113, and has a certain degree of variation. I have.

For this reason, even if the specified restoring force is set by storing the extended shape in the shape memory alloy 120 at the specified operating temperature T1, the restoring force gradually increases as the temperature rises. When the opening force of the pilot valve 112 is decreased, water discharge is started at a temperature lower than the specified operating temperature T1, and when the opening force of the pilot valve 112 is increased, water is discharged at a temperature higher than the specified operating temperature T1. Will start.

[0013] As a result, there is no guarantee that the water discharge will be reliably started when the specified operating temperature T1 is reached by the hot air flow received in the event of a fire, and there is a problem that the operating temperature at which the water discharge is started is not stable and lacks reliability. Was very difficult to mass-produce.

When the fire extinguishing water is discharged from the water discharge port 116 when the piston 108 rises in the event of a fire, the water is sprinkled below the sprinkler head.
And the fire fighting water itself is
The sprinkler head stops discharging water even though the fire has not yet been extinguished.

Furthermore, if an object hits the sprinkler head and the lid 115 or the like is damaged, the sprinkler head may not operate at the time of fire.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and it is possible to discharge a fire extinguishing water by using a shape memory alloy to accurately open a valve at a predetermined temperature in a fire. It is an object of the present invention to provide an automatic opening / closing type sprinkler head which is capable of being excellent in reliability and mass productivity.

[0017]

In order to achieve this object, the present invention is configured as follows. First, the present invention is directed to a closed sprinkler head connected to a fire extinguishing pipe filled with pressurized fire extinguishing water and discharging pressurized fire extinguishing water in a fire.

In the present invention, such a closed-type sprinkler head is provided with a two-way shape memory alloy, and when the temperature is lower than a predetermined temperature, the shape memory alloy is deformed into a lower temperature side shape. Hold the valve mechanism in the water stop position,
When the temperature reaches a predetermined temperature or higher, a first heat-sensitive operating portion that shapes the shape memory alloy on the high temperature side and makes the valve mechanism operable to the water discharge position, and a predetermined water discharge start temperature higher than the predetermined temperature, When the temperature is lower than the water discharge start temperature, the valve mechanism is maintained in a closed state regardless of the operation state of the first heat-sensitive operating section. When the water discharge start temperature is reached, the valve mechanism is decomposed by heat to maintain the valve mechanism closed. And a second heat-sensitive operating portion that releases the fire-extinguishing water by releasing the fire-extinguishing water.

When the first heat-sensitive operating portion drops to a temperature lower than the predetermined temperature during the water discharge by the operation of the second heat-sensitive operating portion, the shape memory alloy is deformed into a lower temperature shape, and the valve mechanism is operated. Operates in a closed state to stop water discharge.

In such a sprinkler head of the present invention, when it receives a hot air flow due to a fire, when the temperature reaches a predetermined temperature or more, the shape memory alloy is deformed into a high-temperature side shape, and the first heat-sensitive operating portion is formed. Activates the valve mechanism to enable water discharge. In this state, when the temperature due to the hot air flow further rises and reaches the specified water discharge start temperature, the second heat-sensitive operating section using a fusible alloy or a glass valve is decomposed by heat, and already operates in a water dischargeable state. The holding of the first heat-sensitive operating portion can be released to start water discharge.

Therefore, even if the temperature at which the shape memory alloy changes from a low-temperature shape to a high-temperature shape has a wide range, the water discharge start temperature is set to the second heat-sensitive operating portion as a heat-sensitive metal or glass. The temperature can be set and guaranteed by a valve, and the reliability of an automatic opening / closing type sprinkler head using a shape memory alloy can be ensured to enable mass production.

Further, since the structure is such that water discharge is started only when both the first and second heat-sensitive operating parts work, even if the object is hit by an object during monitoring, for example, the water is damaged. It is hardly possible to set the operation state, and water discharge due to damage can be reliably prevented.

When the fire caused by the water discharge is extinguished and the temperature is lowered, the shape memory alloy is deformed to a lower temperature side, so that the valve mechanism of the first heat-sensitive operating part is closed and the water discharge is automatically stopped. However, water damage after fire extinguishing can be minimized.

Further, the temperature for stopping the water discharge is a predetermined temperature which is set lower than the water discharge start temperature set for the second heat-sensitive operation mechanism. Can greatly reduce the possibility of re-ignition.

When the temperature reaches a predetermined temperature again after the shape memory alloy is deformed into a low-temperature shape due to a decrease in temperature due to the water discharge and the water discharge is stopped, the first heat-sensitive operating portion is connected to the high-temperature side of the shape memory alloy. The valve mechanism is moved to the water discharge position by the deformation to the shape, and the water is re-discharged. For this reason, even in the event that the fire starts burning again after the stop of water discharge, re-water discharge is automatically performed and the fire can be reliably extinguished.

The first heat-sensitive operating portion is provided with a plurality of shape memory alloys arranged around the second heat-sensitive operating portion, and a force for at least one of the plurality of shape memory alloys to be deformed into a high-temperature shape when the temperature reaches a predetermined temperature or higher. To make the valve mechanism operable to the water discharge position. By arranging a plurality of memory-shaped metals in this way, it is possible to eliminate the temperature difference due to the direction of the hot air flow at the time of fire and to perform the water discharge operation reliably.

Further, when all of the plurality of shape memory alloys are deformed on the low temperature side, the valve mechanism is operated to close to stop the water discharge. For this reason, the discharge of water is not stopped as long as a hot air flow is received from any surrounding direction, and the fire can be reliably extinguished. In addition, by disposing the shape memory alloy above the water sprinkling part, the shape memory alloy can be cooled by the fire extinguishing water itself, preventing the water discharge from stopping before extinguishing, and the hot air flow toward the shape memory alloy can be reduced by the fire extinguishing water. It can be prevented from malfunctioning due to the interruption.

The shape memory alloy used for the first heat-sensitive operating portion has a coil spring shape which is contracted in the axial direction as a shape on the low temperature side, and is deformed into a coil spring shape which is extended in the axial direction when the temperature reaches a predetermined temperature or higher. Further, the shape memory alloy may be a leaf spring shape in which the center is bent in an arc shape as the shape on the low temperature side, and is deformed into a leaf spring shape extended in the axial direction when the temperature reaches a predetermined temperature.

The valve mechanism of the first heat-sensitive operating section includes a main valve that is openably and closably disposed in the middle of the flow path from the inflow port to the water discharge port,
An actuator that operates the main valve to the closed position by supplying the pilot pressure and releases the water by operating the main valve to the open position by discharging the pilot pressure, and an actuator that applies the pilot pressure to the actuator by the valve position based on the low-temperature shape of the shape memory alloy A pilot valve that supplies the main valve to a closed state, discharges pilot pressure from the actuator at a valve position based on the shape of the shape memory alloy on the high-temperature side, and releases the main valve to open the main valve.

Here, the actuator is provided with a diaphragm piston or a piston having a shaft member held at the closed position by the second heat-sensitive operating portion so as to be slidable by introduction and discharge of pilot pressure.

In another embodiment of the valve structure of the first heat-sensitive operating portion, the valve structure is disposed so as to be openable and closable in the middle of the flow path from the inflow port to the water discharge port, is held in the closed position by the second heat-sensitive operating portion, and starts water discharge. A first valve member that operates to an open position to release water when released from holding when a temperature is reached, and a second valve member that is disposed in a flow path on the secondary side of the first valve member and that can open and close the flow path; An actuator for operating the second valve member to the closed position by introducing pilot pressure from the inflow side and operating the second valve member to the open position by discharging the pilot pressure, and a shape of the shape memory alloy on the low temperature side; The pilot pressure is introduced into the actuator at the valve position according to the above, the second valve member is set to the closed position, the pilot pressure is discharged at the valve position due to the deformation of the shape memory alloy to the high-temperature side shape, and the second valve member is set to the open position. Move to discharge water, and further, the first valve There and a pilot valve to stop the water discharge by operating the second valve member in reintroduction of the pilot pressure when the shape memory alloy after working in the open position is deformed to the shape of the constant temperature caudal to the closed position.

Further, the second heat-sensitive operating section is provided with a fusible alloy or a glass valve which is decomposed and released by heat when the water discharge start temperature is reached, whereby the water discharge start temperature can be set accurately.

Other than this, for example, a shape memory alloy using a NiTi alloy has high corrosion resistance as a material characteristic, and further, the start and stop of water discharge do not depend on a fire detection signal from a fire detector. Therefore, there is no problem of water discharge due to malfunction of the fire detector, and the reliability is high.

[0034]

FIG. 1 is a sectional view of a first embodiment of an automatic opening / closing type sprinkler head according to the present invention. The sectional structure in a steady monitoring state in which water discharge is stopped on the right side of an axial center line. The left side shows a cross-sectional structure in a state where a water discharge operation is performed by receiving a hot air flow caused by a fire.

In FIG. 1, the sprinkler head 1
Is formed by screwing the head connecting portion 1a, the head body portion 1b, and the head water discharging portion 1c in the axial direction from above, and the actuator housing portion 1 is provided inside the central head body portion 1b.
d is incorporated.

The head connection portion 1a has a connection screw 4 connected to a water supply pipe to which pressurized fire extinguishing water is supplied.
Pressurized fire extinguishing water filled in the water supply pipe. At the end of this inflow port 3,
A strainer 21 for removing dust is mounted.

A spool hole 3a is provided following the part where the strainer 21 is assembled. The spool hole 3a communicates with the internal flow path 3b, and further passes through a communication hole 20 provided in an axial direction peripheral portion of the actuator accommodating portion 1d. To the lower internal flow path 3c and finally to a water outlet 5 opened inside the head water discharge section 1c.

The spool hole 3 formed following the inlet 3
The spool valve element 7a is located at a in the steady monitoring state, and closes the space between the inflow port 3 and the internal flow path 3b. The spool valve element 7a is formed at one end of the valve shaft 7c, and the piston section 7b is formed integrally with the actuator storage section 1d following the spool valve element 7a. An actuator 8 for driving the opening and closing of the spool valve element 7a is incorporated in the actuator housing 1d.

The actuator 8 has an inner peripheral portion of the diaphragm 8a mounted on a piston portion 7b formed integrally with the valve shaft 7c, and is sandwiched and fixed between an actuator housing portion 1d having a structure in which the outer peripheral portion of the diaphragm 8a is vertically divided. ing. As a result, the storage chamber for the diaphragm 8a is partitioned into a lower diaphragm chamber 9a and an upper diaphragm chamber 9b.

A pilot valve 12 is provided for the actuator 8 as shown on the right side of the head main body 1b. The pilot valve 12 houses a pilot valve body 12a in a pilot valve chamber 12b.
The valve shaft 12c is taken out from the lower part of 2a.

The inlet 3 is connected to the pilot valve chamber 12b.
The pilot inflow path 15 is communicated from a part where the strainer 21 is incorporated. Further, the pilot valve chamber 12b is communicated with the diaphragm chamber 9a by the pilot supply path 16. Further, the pilot discharge passage 18 extends from the lower portion of the pilot valve body 12a toward the open portion inside the head water discharge portion 1c.
Is communicated.

Here, the reason why the pilot discharge passage 18 is opened inside the head water discharge section 1c is as follows.
The fire extinguishing water discharged from the pilot discharge passage 18 due to the discharge of the pilot pressure by the operation of 2 is applied to the two-way shape memory alloy 10 disposed outside the head water discharge section 1c,
This is for preventing the heating temperature by the hot air flow from being cooled.

Below the pilot valve 12, a two-way shape memory alloy 10 is disposed. That is, shape memory alloy 1
0 is a cylindrical spacer 11 surrounding the inside of the flange 1e on the outer periphery of the lower end of the head water discharge section 1c and the outer periphery of the head water discharge section 1c.
Are arranged at a plurality of positions between them, and in this embodiment, have a shape wound in a coil spring shape, and are fixed to the spacer 11 and the head water discharge portion 1c by caulking or the like.

As the shape memory alloy 10, for example, NiT
A highly corrosion-resistant bidirectional material using an i-alloy or the like is used. Here, the bidirectionality of the shape memory alloy means that when heated above a predetermined temperature, the shape memory alloy is deformed into a shape on the high temperature side, and then when the temperature is again lowered below the predetermined temperature, the shape returns to the shape on the low temperature side. However, it is deformed into a shape on the high temperature side or the low temperature side.

In such a bidirectional shape memory alloy 10, the coil spring is deformed into a high temperature side shape which is elongated in the axial direction on the high temperature side above the predetermined temperature T1, and the coil spring is deformed on the low temperature side below the predetermined temperature T1. Is deformed to a shape contracted in the axial direction.

When the temperature is lower than the predetermined temperature T1, the pilot valve element 12a is held at the position where the pilot discharge passage 18 is closed as shown in the figure due to the deformation force of the shape memory alloy 10 which tends to shrink to the lower temperature side. ing. Therefore, the pilot pressure from the pilot inflow passage 15 branched from the pressurized fire extinguishing water supplied to the inlet 3 is supplied from the pilot valve 12 through the pilot supply passage 16 to the diaphragm chamber 9a of the actuator 8, and the diaphragm 8
The piston part 7b is pushed upward as shown in FIG. 3A, whereby the spool valve element 7a is fitted into the spool hole 3a to close the flow path from the inflow port 3 to the internal flow path 3b.

On the other hand, when the sprinkler head 1 receives a hot air flow caused by a fire and the shape memory alloy 10 incorporated around the head water discharge portion 1c is heated to a predetermined temperature T1 or more, the shape memory alloy 10 is heated to a high temperature side. The pilot valve element 1 is extended by the valve shaft 12 c via the spacer 11.
2a is pushed upward to open the pilot discharge passage 18 for the pilot valve chamber 12b and at the same time close the pilot inflow passage 15.

As a result, the pilot pressure supplied to the diaphragm chamber 9a of the actuator 8 passes through the pilot discharge passage 18, and receives the pressure of the fire-extinguishing water acting on the spool valve element 7a to lower the spool valve element 7a. , And the spool hole 3a can be opened.

FIG. 2 is a sectional view of the head main body 1b taken along the line AA in FIG.
A communication hole 20 is provided at two locations in the peripheral portion of the actuator 8, and a diaphragm chamber 9a of the actuator 8 is formed at the center. In the diaphragm chamber 9a, a head body 12b is provided.
A pilot supply passage 16 from the pilot valve chamber 12b of the pilot valve 12 incorporated on the side is opened, and a pilot inflow passage 15 is provided further upward.

Further, as is clear from the left half section of FIG.
The upper diaphragm chamber 9b of the diaphragm 8a is open to the atmosphere through an atmosphere communication passage 17, so that the piston portion 7b can move up and down.

With the structure including the spool valve element 7a, the actuator 8, the shape memory alloy 10 and the pilot valve 12 provided in the sprinkler head 1 shown in FIGS. 1 and 3, the first heat-sensitive operating section 6 in the present invention is formed. It is configured.

The first heat-sensitive operating section 6 is provided with a second heat-sensitive operating section 22 on the head water discharging section 1c side.
The second heat-sensitive operating part 22 is provided below the water outlet 5 with a deflector 23.
Is stored in a freely movable manner and is held by a heat-sensitive operation mechanism using the fusible alloy 30. That is, a support member 24 is mounted at the center of the deflector 23, and the tip of a valve shaft 7 c integrally provided with a spool valve element 7 a and a piston part 7 b abuts a central recess of the support member 24.

The support member 24 is supported by a heat-sensitive operation mechanism provided with the fusible alloy 30. This thermal activation mechanism
It comprises a support plate 25, a holding plate 26, a lock ball 27, heat collecting plates 28 and 29, a fusible alloy 30, a spacer 31, and a set screw 32. That is, the two heat collecting plates 28 and 29 to which the fusible alloy 30 is fixed by the set screw 32 are screwed and fixed to the support plate 25 via the spacer 31 and the holding plate 26, and in this state, the supporting plate 25 and the holding plate 26 are fixed. The lock ball 27 is fitted into the outer periphery of the head water discharging portion 1c and is fitted and fixed to the fitting recess 1f thereunder as shown in the drawing.

When the fusible alloy 30 is melted by receiving a hot airflow caused by a fire, the second heat-sensitive operating section 22 loosens the holding plate 26 supported via the spacer 31 so that the lock ball 2
7 enters the gap with the support plate 25, and the portion below the support plate 25 separates from the head water discharge section 1c as shown in the lower part of the left half cross section, thereby releasing the holding of the valve shaft 7c. When the second heat-sensitive operating section 22 operates, the deflector 23 (water sprinkling section) housed in the head water discharging section 1c descends and is exposed below the sprinkler head 1.

When the holding of the valve shaft 7c is released due to separation and falling off when the fusible alloy 30 of the second heat-sensitive operating portion 22 is melted by the heat of a fire, and when the temperature reaches a predetermined lower temperature T1 or higher. Due to the deformation of the shape memory alloy 10 to the shape on the high temperature side, the spool valve element 7a of the first heat-sensitive operating section 6 is already in a state where it can be opened. For this reason, when the holding of the valve shaft 7c is released, the spool valve element 7a comes out of the spool hole 3a to open the flow path, and the pressurized fire extinguishing water from the inflow port 3 passes through the communication hole 20 of the actuator housing 1d, The water is discharged from the water outlet 5 through the internal flow path 3c and hits the deflector 23 to be sprayed around.

Here, when the pilot valve 12 provided in the first heat-sensitive operating section 6 is actuated, the shape memory alloy 10 which is capable of opening the spool valve body 7a by the actuator 8 is deformed from a low-temperature shape to a high-temperature shape. Assuming that the temperature is T1 and the water discharge start temperature determined by the melting temperature of the fusible alloy 30 at which the second heat-sensitive operating section 22 operates is T2, the water discharge start temperature T2
In contrast, the memory recovery temperature T1 of the shape memory alloy 10 is set lower.

Therefore, when receiving a hot air flow due to a fire, first, the shape memory alloy 10 rises to a predetermined temperature T1,
The actuation of the pilot valve 12 causes the actuator 8 to open the spool valve element 7a, and then dissolves the fusible alloy 30 when the water discharge start temperature T2 is reached by a hot airflow caused by a fire. The holding of the spool valve element 7a is released via the valve shaft 7c, and the water discharge is started.

The water discharge start temperature T2 of the fusible alloy 30 at which the water discharge is started is accurately determined by the material of the fusible alloy 30, and is a predetermined temperature at which the shape memory alloy 10 is deformed from the low-temperature shape to the high-temperature shape. Even if T1 has a width with respect to the temperature rise, water can be reliably discharged at a predetermined water discharge start temperature T2 determined by the material of the fusible alloy 30 without being affected by this.

FIG. 3 is a characteristic diagram of the elastic coefficient G with respect to the temperature of the bidirectional shape memory alloy 10 used in the present invention, and the deformation force is in a relationship proportional to the elastic coefficient. The shape memory alloy 10 is deformed to a low-temperature shape when the temperature is lower than the predetermined temperature T1, and changes to a high-temperature shape when the temperature increases to the predetermined temperature T1 or more. There is a transformation zone between them.
As the two-way shape memory alloy used in the present invention, an alloy having a narrow transformation region and an elastic coefficient G which determines a deformation force before and after a predetermined temperature T1 changes rapidly. FIG.
Is a measured characteristic of the elastic coefficient G with respect to the temperature T of the bidirectional shape memory alloy 10 having the coil spring shape provided in the sprinkler head 1 of FIG. For example, the water discharge start temperature determined by the fusible alloy 30 of the second heat-sensitive operating section 22 is T2
= 74 ° C., the operating temperature range of the pilot valve 12 due to the deformation of the shape memory alloy 10 is, for example, T1 = 30 to 60
C., for example, T1 = 50 ° C.

More specifically, the shape of the shape memory alloy 10 based on the elastic modulus G50 at the temperature of 50 ° C. in FIG. 4 is set so that the flow path of the pilot discharge passage 18 of the pilot valve body 12a is closed. The shape in which the coil spring extends on the high temperature side is determined.

As a result, the temperature of the shape memory alloy 10 becomes T1
= 50 ° C., the shape memory alloy 10 is deformed from the contracted shape on the low-temperature side to the elongated shape on the high-temperature side, pushing up the pilot valve body 12a and simultaneously closing the pilot inflow passage 15, and the diaphragm of the actuator 8. The pilot pressure is discharged from the chamber 9a.

When at least one of the plurality of shape memory alloys 10 provided on the outer periphery of the head water discharge section 1c reaches a predetermined temperature T1 or more, the spacer 11 is raised and the pilot valve body 12 is operated to discharge water. State. This prevents a delay in temperature detection due to the influence of the airflow, and ensures that the fire temperature is detected and water is discharged regardless of the direction of the hot airflow.

The flange 1e extending to the outer periphery of the end of the head water discharge section 1c is provided with the fire extinguishing water discharged on the deflector 23, applied to the shape memory alloy 10, and cooled directly to stop water discharge before extinguishment. It also has the function of avoiding water.

The plurality of shape memory alloys 10 arranged around the second heat-sensitive operating part 22 are exposed when the second heat-sensitive operating part 22 is operated. It is located above. Therefore, without cooling the shape memory alloy 10 with the fire extinguishing water to be discharged, the fire extinguishing water further blocks the hot air flow toward the shape memory alloy 10, preventing the water discharge from stopping before the fire is extinguished, and accurately detecting the surrounding heat. To prevent malfunction.

Next, the operation of the embodiment of FIG. 1 will be described with reference to FIG. FIG. 4 is a graph showing the operation of each part at a temperature around the sprinkler head. Here, a curve a indicates a temperature curve immediately above the fire source, and a curve b
Shows the ambient temperature curve in the sprinkler head 1 that is located away from directly above the fire source.

At the time of low temperature in which the steady monitoring state is established, the deformation force of the shape memory alloy 10 provided in the first heat-sensitive operating section 6 into the low-temperature side shape that shrinks the low-temperature side coil spring is transmitted through the spacer 11 via the spacer 11. Pilot valve body 12a of valve 12
Is the initial position shown, the pilot inflow path 15 is opened to the pilot valve chamber 12b, and the pilot discharge path 18 is held at the closed valve position.

Accordingly, the pressure from the pressurized fire extinguishing water filling the fire extinguishing pipe supplied to the inflow port 3 is supplied to the diaphragm chamber 9a of the actuator 8 as pilot pressure, and the diaphragm 8a and the piston portion 7b are shown in FIG. To the spool valve element 7 at the tip of the valve shaft 3c.
a is located in the spool hole 3a, and the flow path from the inflow port 3 to the internal flow path 3b is closed.

In this state, when a hot air flow due to a fire is received,
When the shape memory alloy 10 reaches a predetermined temperature T1 or higher, the coil spring is deformed to a shape on the high temperature side where the coil spring is extended, and the spacer 11
The pilot valve body 12a is pushed up by the valve shaft 12c via the valve shaft 12c to close the pilot inflow path 15 and open the pilot discharge path 18 to the pilot valve chamber 12b.

Therefore, the pilot pressure supplied to the diaphragm chamber 9a of the actuator 8 is discharged from the pilot discharge path 18 through the pilot supply path 16 and the pilot valve chamber 12b, and the spool body 7a is moved to the closed position of the spool hole 3a. The pressing force is released. However, at this time, the second heat-sensitive operating portion 22 is not operating, and the valve shaft 7c is held in a closed state in which the spool valve element 7a is located in the spool hole 3a.

As described above, in the state where the first heat-sensitive operating part 6 is operated, the temperature due to the hot air flow caused by the fire further rises, and the water discharge start temperature T2 at which the fusible alloy 30 of the second heat-sensitive operating part 22 melts.
, The fusible alloy 30 melts and the support plate 26
Is lowered together with the spacers 31 and the peripheral heat plates 28 and 29, the lock by the lock ball 27 is released, and as shown in the lower part of the left half cross section in FIG. take off.

For this reason, the holding of the valve shaft 7c in the closed state by the support member 24 is released, and the valve shaft 7c drops together with the deflector 23 into the opening 1h of the head water discharge section 1c and is held by the flange 1g. Since the release of the holding of the valve shaft 7c has already enabled the actuator 8 to operate the spool valve element 7a to the open state, the spool valve element 7a receives the pressure of the fire extinguishing water from the inflow port 3 and descends. Then, the spool hole 3a is opened.

For this reason, the fire extinguishing water from the inflow port 3 is supplied to the spool hole 3a, the internal flow path 3b, the through hole 20, and the internal flow path 3c.
The water is discharged from the water outlet 5 toward the deflector 23 through the water outlet, and hits the deflector 23 to be sprinkled around. As the fire extinguishing water is discharged, the intensity of the flame is reduced, so that the temperature of the hot air flow gradually decreases as shown by the curve b in FIG.

When the fire is extinguished by the discharge of the fire extinguishing water, the temperature drops due to the lack of hot air flow. This temperature drop causes the shape memory alloy 10 to reach the predetermined temperature T
When the temperature falls below 1, the shape memory alloy 10 is deformed into a low-temperature shape that shrinks the coil spring, and returns the pilot valve body 12a of the pilot valve 12 to the initial position via the spacer 11.

Therefore, the pilot valve element 12a of the pilot valve 12 closes the pilot discharge passage 18 and
The pilot inflow path 15 is opened, and the pressure of the pressurized fire-extinguishing water against the inflow port 3 is set as the pilot pressure by the actuator 8.
Is supplied to the diaphragm chamber 9a. For this reason, the spool valve element 7a is controlled by the diaphragm 8a and the piston portion 7b.
Is pushed up and fitted into the spool hole 3a to close the flow path. As a result, the discharge of fire extinguishing water is automatically stopped.

After the fire extinguishing water is automatically stopped, if the shape memory alloy 10 rises above the predetermined temperature T1 due to the reheating and the hot airflow as shown by the broken line in FIG. It operates to discharge the pilot pressure in the diaphragm chamber 9a. At this time, since the second heat-sensitive operating portion 22 has already been operated, the spool valve element 7a is drawn downward from the spool hole 3a by the pressure of the fire-extinguishing water accompanying the discharge of the pilot pressure from the diaphragm chamber 9a, and flows through the flow path. The fire extinguishing water is released and the fire extinguishing water is restarted.

Of course, if the fire is extinguished after the water discharge is resumed and the temperature of the shape memory alloy 10 falls to a temperature lower than the predetermined temperature T1, the shape memory alloy 10 will be deformed into a low-temperature side shape in which the coil spring is contracted, The valve 12 switches to a state in which the pilot pressure is supplied to the diaphragm chamber 9a, whereby the spool valve element 7a returns to the spool hole 3a, closes the flow path again, and stops water discharge.

FIG. 5 shows a second embodiment of an automatic opening / closing type sprinkler head according to the present invention. The right side of the axial center line shows a cross section in a state where water discharge is stopped at a low temperature, and the left side receives a hot air flow caused by a fire. 3 shows a cross section in a state where a water discharging operation is performed. In the second embodiment, the second heat-sensitive operating section 22
Uses a glass bulb.

In FIG. 5, the sprinkler head 1 of the automatic opening / closing type has a screw structure of a head connecting portion 1a, a head main body portion 1b, and a head water discharging portion 1c from above.
An actuator accommodating section 1d is incorporated in the head main body 1b. An inflow port 3 is provided in the head connection portion 1a, and a spool hole 3a is formed at a contact portion thereof,
A spool valve element 7a formed at one end of a valve shaft 7c is slidably incorporated.

An actuator 8 is incorporated in the actuator housing portion 1b housed inside the head main body portion 1b.
Instead of the diaphragm piston, an actuator piston 7d is formed on the valve shaft 7c and is slidably incorporated in the cylinder 9.

The cylinder 9 has an actuator piston 7d
The lower cylinder chamber 9c and the upper cylinder chamber 9d
It is divided into. The actuator 8 is operated by a plurality of pilot valves 12. The pilot valve 12 has a pilot valve body 12a incorporated in a pilot valve chamber 12b, a pilot inflow path 15 communicating with the pilot valve chamber 12b from above, and a pilot supply path 16 communicating with the cylinder chamber 9c. .

Further, a valve shaft 13 is integrally extended from a lower portion of the pilot valve body 12a, and a pilot discharge passage 18 is opened inside the head water discharge portion 1c in storing the valve shaft 13. The tip of the valve shaft 13 is fixed to the spacer 11,
The two-way shape memory alloy 10 is incorporated below the spacer 11.

The structure including the spool valve element 7a, the actuator 8, the shape memory alloy 10, and the pilot valve 12 constitutes the first heat-sensitive operating section 6 in this embodiment.

FIG. 6 is a BB cross section of the head main body 1b of FIG. As is apparent from this cross section, the head body 1
The actuator housing portion 1d is incorporated in the inside of b, and a communication hole 20 is formed in the actuator housing portion 1d in two places. A cylinder 9 is formed at the center of the actuator housing 1d, and a valve shaft 7c having a spool valve element 7a and an actuator piston 7d passes through the center.

A pilot supply passage 16 communicates with the cylinder chambers of the cylinder 9 through pilot valve chambers 12b provided by the number of shape memory alloys.
A pilot inflow path 15 is formed from 2b toward the upper part.

Referring again to FIG. 6, an atmosphere communication passage 17 is open to the cylinder chamber 9 d above the actuator piston of the cylinder 9. Head water discharge section 1c
, A second heat-sensitive operating section 22 is provided.

In the second heat-sensitive operating portion 22 of this embodiment, a glass bulb 36 is used instead of the fusible alloy 30 of FIG.
You are using The glass valve 36 is disposed between a lower end of the valve shaft 7c and a support member 39 screwed and fixed to a central support member 38 of a deflector 37 attached to a lower opening of the head water discharge section 1c. The spool valve element 7a is held at a closed position located in the spool hole 3a.

The position of the spool valve element 7 a by the glass valve 36 can be adjusted slightly by adjusting the screwing of the support member 38 into the support member 39. Glass bulb 3
As is well known, the alcohol-based solution is sealed in a capsule-shaped glass container, and the structure is such that when heated, the solution expands to break the glass capsule.
A predetermined operating temperature, that is, the sprinkler head 1 of the present invention.
Is set at the specified water discharge start temperature T2. The predetermined temperature T1 at which the shape of the shape memory alloy 10 provided in the first heat-sensitive operating portion 6 changes is set lower than the water discharge start temperature T2 determined by the glass valve 36.

Further, in the embodiment of FIG. 5, a plurality of shape memory alloys 10 are arranged around the head water discharge section 1c, and a spacer 11 and a pilot valve 12 are provided for each shape memory alloy 10.

By providing the shape memory alloy 10, the recovery spring 14 and the pilot valve 12 at a plurality of locations around the sprinkler head 1 as described above, the position where the hot air flow is most likely to be received regardless of the direction of the hot air flow due to the fire. When the shape memory alloy 10 operates first to discharge the pilot pressure from the cylinder chamber 9c by the pilot valve 12, then when the temperature due to the hot air flow reaches the water discharge start temperature T2 determined by the glass valve 36, the glass valve 36 As a result, the closed and held state of the spool valve element 7a is released, and the fire extinguishing water is discharged.

On the other hand, when the fire is extinguished after the start of the water discharge, the water discharge is stopped due to the temperature drop, and all of the shape memory alloys 10 provided at a plurality of locations around the sprinkler head 1 become lower than the predetermined temperature T1. Only when the pilot valve 12 is restored when the coil spring is deformed to the low temperature side in which the coil spring is contracted, the supply of pilot pressure to the cylinder chamber 9c of the actuator 8 becomes effective. Returning to 3a, the flow path is closed to stop water discharge.

FIG. 7 shows a third embodiment of an automatic opening / closing type sprinkler head according to the present invention. The right side of the center line in the axial direction is a cross section in a state where water discharge is stopped at a low temperature, and the left side receives a hot air flow due to a fire. 3 shows a cross section in a state where a water discharging operation is performed.

Also in the third embodiment shown in FIG. 7, the sprinkler head 1 has a head connecting portion 1a and a head main body portion 1b.
And a split structure in which the head water discharge section 1c is screwed and fixed in the axial direction. An inflow port 3 is provided in the head connection portion 1a, and a strainer 21 is incorporated in the back of the inflow port 3;
Subsequently, a spool hole 3a for accommodating the spool valve element 7a is formed.

The spool valve element 7a constitutes the first valve mechanism 41, and merely holds the tip of the valve shaft 7c in the closed state by the second heat-sensitive operating part 22 mounted on the lower part. A second valve mechanism 42 is provided around the first valve mechanism 41.
The second valve mechanism 42 includes a head connecting portion 1a and a head main body 1
A valve piston 44 is slidably incorporated in a cylinder 43 separated by a partition wall 50b through a spring 45 at an upper portion.

The valve piston 44 has a cylindrical guide portion 51 formed so as to surround the spool hole 3a following the inflow port 3.
The inner diameter hole of the small diameter portion 44a is slidably incorporated into the cylinder 43, and the large diameter portion 44c lowered axially through the cylindrical portion 44b is slidably incorporated in the cylinder 43.
c, a valve seal 46 is attached to the end face, and the head body 1
The opening / closing operation is performed by pressing the end surface of the partition wall 50 of b.

FIG. 8 is a sectional view taken along the line C--C in FIG. 7, in which a communication hole 20 is formed at two places in a partition wall 50 of the head main body 1b, and a spool valve element 7a is provided at the center thereof. The valve shaft 7c penetrates, and a pilot inflow passage 15 for the pilot valve 12 is formed in the peripheral wall portion.

Referring again to FIG. 7, the valve piston 4
A pilot inflow path 48 is opened from the inflow port 3 to the cylinder chamber in which the fourth spring 45 is incorporated. A pilot valve 12 is provided in the head main body 1b, and a pilot valve chamber 12b of the pilot valve 12 is provided.
The pilot inflow passage 1 from the cylinder chamber of the second valve mechanism 42
5 is connected. Further, the opposite side of the pilot valve element 12a is opened to the inside of the head water discharge section 1c by the pilot discharge path 18.

The valve shaft 12c of the pilot valve 12 is taken out downward, a cylindrical spacer 11 is fixed to the tip of the valve shaft 12c, and the lower part of the spacer 11 and the head water discharge portion 1c
The two-way shape memory alloy 40 is arranged between the flange 1e extending around the outer periphery of the end by caulking and fixing the both ends. In this embodiment, the shape memory alloy 40 has a predetermined temperature T1.
As the lower temperature side, a spring plate shape that is bent in an arc shape at the center is used, and when it reaches a predetermined temperature T1 or more due to a hot air flow caused by a fire, an arc portion like a left half section Deforms into the extended high-temperature side shape.

The first heat-sensitive operating portion 6 in this embodiment is constituted by the second valve mechanism 42, the shape memory alloy 40, and the pilot valve 12. The second valve mechanism 42 also has the function of an actuator that operates when the pilot pressure is introduced and discharged.

The second water discharging section 1c provided on the side of the head water discharging section 1c is provided.
The heat-sensitive operating part 22 uses the same fusible alloy 30 as the first embodiment of FIG. Further, the memory recovery temperature T1 of the shape memory alloy 40 provided in the first heat-sensitive operating portion 6 is set lower than the water discharge start temperature T2 of the second heat-sensitive operating portion 22 determined by the fusible alloy 30.

Next, the operation of the third embodiment shown in FIG. 7 will be described. In the steady monitoring state in which the temperature is lower than the predetermined temperature T1, the shape memory alloy 40 is deformed into a leaf spring shape in which the center is bent in an arc shape as shown in the right half section of FIG. At this time, the communication between the pilot valve 12 and the pilot discharge passage 18 is closed by the pilot valve body 12a.

For this reason, the pressure of the pressurized fire extinguishing water is applied to the cylinder chamber of the second valve mechanism 42 from the pilot inflow passage 48, and the valve piston 44 is pushed down in accordance with the force of the spring 46, and the large-diameter portion 44c The valve seal 46 attached to the end face is pressed against the partition wall 50 of the head main body 1b to close the valve.

When the shape memory alloy 40 is heated to a temperature equal to or higher than the predetermined temperature T1 by receiving a hot air flow caused by a fire in such a low-temperature regular monitoring state, the shape memory alloy 40 is deformed into a shape on the high temperature side extended in the axial direction. And the valve shaft 12 via the spacer 11.
The pilot valve element 12a is pushed up by c to open the pilot inflow path 15 to the pilot discharge path 18 and discharge the pressure applied to the cylinder chamber of the second valve mechanism 42. For this reason, the valve piston 44 is pressed and supported in a closed state by only the spring 45.

Subsequently, when the temperature due to the hot air flow rises and reaches the water discharge start temperature T2, the fusible alloy 30 provided in the second heat-sensitive operating section 22 is melted, and the supporting plate 25 as shown in the lower half of the left half section. The members located below are separated and fall off. Thereby, the holding of the spool valve element 7a in the closed state in the first valve mechanism 41 via the valve shaft 7c is released,
The spool valve element 7 a descends by receiving the pressure of the fire extinguishing water from the inflow port 3, and is stored in the spool storage section 47. For this reason, pressurized fire extinguishing water flows into the inside of the valve piston 44 through the inflow port 3 and the spool hole 3a, and pushes up the valve piston 44 upward like a left half cross section against the spring 45, and the valve seal 46 Second valve mechanism 42
Is closed and released. The fire extinguishing water that has flowed into the communication hole 20 is opened at the periphery of the partition wall 50 as shown by a broken line.
The water is discharged from the lower water discharge port 5 through the water, and hits the deflector 23 which has fallen downward by the heat-sensitive operation of the second heat-sensitive operating part 22 to be sprayed around.

The fire was extinguished by sprinkler water sprinkling from the sprinkler head 1, the hot air flow disappeared, the temperature dropped, and when the temperature became lower than the predetermined temperature T1, the shape memory alloy 4
0 is a right half cross-section, and is deformed to a low-temperature side shape in which the center is bent into an arc shape in the form of a plate spring, and the pilot valve body 12 a of the pilot valve 12 blocks communication with the pilot discharge passage 18.

For this reason, the pressure of the pressurized fire extinguishing water is introduced into the cylinder chamber of the valve piston 44 from the pilot inflow passage 48, and the valve piston 44 descends as shown in the right half section, and the valve seal 46 is attached to the partition wall 50. The contact and the inflow path leading to the through hole 20 are closed, and the water discharge is automatically stopped.

When the fire again occurs after the water discharge is stopped and the temperature of the shape memory alloy 40 exceeds the predetermined temperature T1 due to the hot air flow,
The shape memory alloy 40 is deformed to a high temperature side shape extended in the axial direction, the pilot valve body 12a of the pilot valve 12 is operated to be in communication with the pilot discharge path 18, and the spring 45 of the second valve mechanism 42 is incorporated. By discharging the pressure applied to the cylinder chamber, the valve piston 44
Due to the pressure of the fire-extinguishing water added to the inside, the valve piston 44 rises as shown in the left half section, the valve seal 46 is separated from the end face of the partition wall 50, and the flow path is opened again to discharge water again. Of course, when the shape memory alloy 40 falls below the predetermined temperature T1 by the re-water discharge, the water discharge is automatically stopped again.

Note that the present invention is not limited to the above-described embodiment, and the predetermined temperature T of the shape memory alloy which is deformed from the low-temperature side to the high-temperature side in order to perform the heat-sensitive operation of the first heat-sensitive operating portion.
Any suitable structure can be adopted as long as 1 is set to be lower than the water discharge start temperature T2 by a fusible alloy or a glass valve that starts water discharge in the second heat-sensitive operating section. I do not receive.

[0108]

As described above, according to the present invention, when a hot air flow due to a fire is received, first, when the shape memory alloy reaches a predetermined temperature or more, the shape memory alloy is deformed from a low-temperature shape to a high-temperature shape. The first heat-sensitive operating part is operated to set the valve mechanism in a water dischargeable state. In this state, when the temperature due to the hot air flow further rises and reaches a specified water discharge start temperature, a fusible alloy or a glass valve or the like is used. (2) The heat-sensitive operating portion is thermally decomposed, and the first heat-sensitive operating portion can release the holding of the valve mechanism already in a water-dischargeable state and start water discharge. As a result, the temperature reaches a predetermined temperature at which the shape memory alloy is deformed. Even if there is
Precisely set the water discharge start temperature to the specified temperature using a fusible alloy or glass valve, etc. to guarantee the water discharge start temperature, secure the reliability of the automatic opening and closing type sprinkler head using shape memory alloy, and at the same time mass produce. Make it possible.

Further, since water is started to be discharged only when both the first heat-sensitive operating portion using a shape memory alloy and the second heat-sensitive operating portion using a fusible alloy or a glass valve work, the sprinkler head is used for monitoring. For example, in the case where an object is damaged by hitting an object, the two are hardly operated at the same time due to the damage, so that water discharge due to the damage can be reliably prevented.

When the fire is extinguished by water discharge and the temperature drops, the shape memory alloy is deformed from the high-temperature side to the low-temperature side, whereby the valve mechanism of the first heat-sensitive operating section is closed. Water discharge is automatically stopped, and water damage after fire extinguishing can be minimized.

The temperature for stopping the water discharge is the memory recovery temperature of the shape memory alloy set sufficiently lower than the water discharge start temperature determined by the fusible alloy or the glass valve. The fact that the temperature can be sufficiently low can greatly reduce the possibility of re-ignition after extinguishing.

Of course, if a hot air flow due to re-ignition after the extinguishing is received, the shape memory alloy is deformed into a high-temperature side shape at a predetermined temperature or higher, so that the valve mechanism of the first heat-sensitive operating section is operated again to discharge water again. In the unlikely event that the first fire extinguishing was inadequate, the fire can be reliably extinguished by re-watering.

Further, the shape memory alloy has a high corrosion resistance as a material characteristic, and operates reliably when subjected to a hot air flow due to a fire, and has a high reliability even when monitoring the installation for a long period of time. Can be guaranteed. Furthermore, since there is no need to rely on a fire detection signal from a fire detector or the like at all for stopping and starting water discharge, there is no problem of water discharge due to malfunction of the fire detector, and reliability when installed in fixed fire extinguishing equipment is improved. Can be guaranteed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention in a half cross section in each of a monitoring state and a water discharge state.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a characteristic diagram of an elastic coefficient with respect to temperature of a bidirectional shape memory metal used in the present invention.

FIG. 4 is an explanatory diagram illustrating the operation of the first embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a second embodiment of the present invention in a half cross section for each of a monitoring state and a water discharge state.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a sectional view showing a third embodiment of the present invention in a half section for each of a monitoring state and a water discharge state.

8 is a sectional view taken along the line CC in FIG. 7;

FIG. 9 is a sectional view of a conventional sprinkler head.

FIG. 10 is a characteristic diagram of an elastic coefficient with respect to a temperature of a shape memory metal.

[Explanation of symbols]

 1: sprinkler head 3b, 3c: internal flow path 6: first heat-sensitive operating part 7a: spool valve element 7b: piston part 7c: valve shaft 8: actuator 8a: diaphragm 9a, 9b: diaphragm chamber 10: shape memory alloy (2) (Directivity) 12: Pilot valve 12a: Pilot valve body 12b: Pilot valve chamber 12c: Valve shaft 15: Pilot inflow path 16: Pilot supply path 18: Pilot discharge path 22: Second heat-sensitive operating section 30: Soluble alloy 36: Glass valve 40: Shape memory alloy (two-way) 41: First valve mechanism 42: Second valve mechanism 43: Cylinder chamber 44: Valve piston 46: Valve seal 47: Spool receiving hole 48: Pilot inflow path

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor, Shigeru Shigeru 2-10-43, Kami-Osaki, Shinagawa-ku, Tokyo Ho Chiki Co., Ltd. F-term (reference) 2E189 BC02 BC04 CA08 CC02 CD01 CD06

Claims (11)

[Claims] A closed sprinkler head connected to a fire extinguishing pipe filled with pressurized fire extinguishing water and discharging pressurized fire extinguishing water in the event of a fire, comprising a bidirectional shape memory alloy, When the temperature is lower than a predetermined temperature, the shape memory alloy is deformed into a low-temperature side shape to hold the valve mechanism at the water discharge stop position, and when the temperature reaches or exceeds the predetermined temperature, the shape memory alloy changes to a high-temperature side shape. A first heat-sensitive operating portion that is deformed to make the valve mechanism operable to the water discharge position; and a predetermined water discharge start temperature higher than the predetermined temperature, and when the temperature is lower than the water discharge start temperature, (1) holding the valve mechanism in a closed state irrespective of the operation state of the heat-sensitive operation unit,
When the temperature reaches the water discharge start temperature, the valve is decomposed by heat to release the closed state of the valve mechanism and discharge the fire extinguishing water.
A sprinkler head comprising: a heat-sensitive operating portion. 2. The sprinkler head according to claim 1, wherein the first heat-sensitive operating portion is configured to release the water when the temperature is lowered to a temperature lower than the predetermined temperature during water discharge by the operation of the second heat-sensitive operating portion. A sprinkler head characterized in that the shape memory alloy is deformed into a shape on the low temperature side so that the valve mechanism is operated in a closed state to stop water discharge. 3. The sprinkler head according to claim 2, wherein the first heat-sensitive operating portion reaches the predetermined temperature after the shape memory alloy is deformed into a low-temperature side shape to stop water discharge. A sprinkler head characterized in that the shape memory alloy is deformed into a shape on the high-temperature side and the valve mechanism is operated to a water discharge position to re-discharge water at the time. 4. The sprinkler head according to claim 1, wherein the first heat-sensitive operating portion includes a plurality of the shape memory alloys arranged around the second heat-sensitive operating portion, and When at least one of the shape memory alloys is actuated when the temperature reaches the predetermined temperature, the valve mechanism can be operated to the water discharge position by a restoring force. The sprinkler head is characterized in that, when deformed, the valve mechanism is operated in a closed state to stop water discharge. 5. The sprinkler head according to claim 1, wherein the shape memory alloy is disposed above a water spray portion. 6. The sprinkler head according to claim 1, wherein the shape memory alloy has a coil spring shape contracted in an axial direction as the shape on the low temperature side, and the shape memory alloy has a shape corresponding to the predetermined temperature. A sprinkler head characterized by being deformed into a coil spring shape extended in the axial direction upon reaching. 7. The sprinkler head according to claim 1, wherein the shape memory alloy has a leaf spring shape whose center is bent in an arc shape as the low-temperature side shape. A sprinkler head characterized by being deformed into a leaf spring shape extending in the axial direction when temperature is reached. 8. The sprinkler head according to claim 1, wherein the valve mechanism of the first heat-sensitive operating section comprises: a main valve arranged to be freely openable and closable in the middle of a flow path from an inflow port to a water discharge port; An actuator that operates the main valve to the closed position by supplying pressure, and operates the main valve to the open position by discharging pilot pressure to release water, and a pilot pressure at a valve position based on the low-temperature shape of the shape memory alloy. A pilot valve that supplies the actuator to close the main valve, discharges pilot pressure from the actuator at a valve position according to the shape of the shape memory alloy on the high-temperature side, and discharges water by opening the main valve,
A sprinkler head comprising: 9. The sprinkler head according to claim 8, wherein the actuator normally operates a diaphragm piston or a piston integrally provided with a shaft member held in a closed position by the second heat-sensitive operating portion. A sprinkler head slidably provided by the introduction and discharge of water. 10. The sprinkler head according to claim 1, wherein the valve mechanism of the first heat-sensitive operating part is arranged to be freely openable and closable in a flow path from an inlet to a water discharge port, and the second heat-sensitive operating part is provided. A first valve member that is held in the closed position by the part and that is operated to the open position to release water by releasing the holding when the water discharge start temperature is reached; A second valve member capable of opening and closing the flow path; and operating the second valve member to the closed position by introducing pilot pressure from the inlet side, and operating the second valve member to the open position by discharging pilot pressure. An actuator for releasing water by applying a pilot pressure to the actuator at a valve position according to the shape of the shape memory alloy on the low temperature side to bring the second valve member into the closed position; Pilot pressure at position And the second valve member is moved to the open position to discharge water, and further, the pilot pressure when the shape memory alloy is deformed to the low-temperature side shape after the first valve member is operated to the open position. A sprinkler head, comprising: a pilot valve for stopping the water discharge by operating the second valve member to a closed position by re-introduction. 11. The sprinkler head according to claim 1, wherein the second heat-sensitive operating portion includes a fusible alloy or a glass valve that is decomposed and released by heat when the temperature reaches the water discharge start temperature. A closed type sprinkler head characterized by the following.