JPH0571272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sprinkler in which a valve is provided between a water pipe and a nozzle.

[Prior art]

Sprinklers are a type of automatic fire extinguishing equipment that is installed indoors on ceilings, etc., and the metal or fuse installed in the head may melt due to high temperatures during a fire, or other automatic devices may cause a fire to occur. At times, the head valve opens mechanically, allowing pressurized water to be sprayed all over the area from the nozzle. Therefore, even if the fire is extinguished, water will continue to be sprayed unless the main valve of the sprinkler is closed, causing products in department stores to become water-soaked and spoiled. Also, even if the fire is extinguished in the area where water was first sprayed and other areas are on fire, all the sprinklers that have been activated will continue to spray water, so the amount of water in each sprinkler will decrease, the water pressure will drop, and the nozzles in the necessary areas will be There was an inconvenience that watering was not done sufficiently.

As such a sprinkler, for example, as disclosed in Japanese Patent Application Laid-Open No. 52-58297, a technology is disclosed in which a valve is opened by the heat generated by the ignition using a bimetal, and the valve is closed when the temperature drops after the fire is extinguished.

However, the temperature at the valve does not necessarily match the temperature when the fire is extinguished, so water is wasted.

[Knowledge about invention]

As a result of various studies, the present inventor found that since the coverage area of one sprinkler is approximately constant, when a fire occurs, if a certain amount of water is released, the temperature can be reliably lowered and the fire extinguished.

[Problem to be solved]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sprinkler that can substantially completely extinguish a fire using a minimum amount of water in the event of a fire.

[Means to solve problems]

According to the present invention, a sprinkler in which a valve is provided between a water pipe and a nozzle includes a circular valve chamber and a valve body that is provided in the valve chamber and rotates to open and close a passage. a rotating means for rotating;
It has a locking means that locks the valve body in the closed position when the temperature is low and releases the lock of the valve body when the temperature is high.

[Explanation of effects]

Therefore, when a fire occurs and the temperature becomes high, the locking means made of, for example, a shape memory alloy releases the locking of the valve body, and the valve body is rotated by the rotating means made of, for example, a spring. . The valve is then opened, water is sent from the water pipe to the nozzle, and the water is injected from the nozzle. The rotating means rotates the valve, for example, just one turn or several turns for a certain period of time, during which time a certain amount of water is injected from the nozzle,
Extinguish the fire. If the fire is extinguished during the process, the locking means is locked due to the drop in temperature and the valve is closed.

As described above, according to the present invention, since the valve closes after a certain amount of water is injected, water is sprayed for a substantially certain period of time, and sufficient water is injected for the receiving area of one sprinkler. Damage to products, etc. is prevented, and there is no drop in water pressure due to water consumption. In addition, a sufficient amount of water can be sprayed from other nozzles to fight fires in other locations.

[Preferred embodiment]

Preferably, the locking means is a double coil consisting of a coil made of a shape memory alloy whose full height is memorized at high temperature and a tension coil spring made of ordinary spring material. Alternatively, it may be a double coil consisting of a coil made of a shape memory alloy that is memorized in a bent state at high temperatures, and a coil made of an ordinary spring material. Further, it is preferable to use a rotary valve having a double coil as a stopper member.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, the sprinkler head 20 is configured as a rotary valve with a circular valve chamber 21 and a fan-shaped valve body 22 housed therein. The mainspring 24 interposed between the end of the valve 23 and the case 28 of the head 20 is biased to rotate clockwise as shown by the arrow; Head 20 via lever 25
It is designed to be locked by a double coil 26 implanted in a case 28. The upper part of the valve chamber 21 is connected to the water pipe 5, and the lower part is connected to the nozzle 6.
is communicated with. When the valve body 22, which cuts off communication between the valve chamber 21 and the water pipe 5, or closes the valve, rotates in the direction of the arrow, water in the water pipe 5 is sprayed from the nozzle 6 through the valve chamber 21. ing. The double coil 26 is shown in FIG. 6, and the double coil 26 includes a coil 26a made of a shape memory coil that is memorized to bend when exposed to high temperatures.
and a coil spring 26b made of ordinary spring material.
Therefore, at room temperature, due to the coil spring 26b,
The double coil 26 stands upright and locks the lever 25, but when the temperature rises due to a fire, the coil 26a
is bent as shown by the dotted line against the coil spring 26b to release the locking of the lever 25 by the coil 26.

When operating, if there is no fire and the temperature is normal,
The coil 26a made of the shape memory sum of the double coil 26 is in a soft state, so the coil spring 26b causes the double coil 26 to stand upright and press the lever 25.
is locked, and the valve body 22 closes the flow path.

When a fire occurs, the shape stored in the coil 26a made of the shape memory sum of the double coil 26 is recalled due to the high temperature, and the coil spring 2
The coil spring 26 bends as shown by the dotted line against the coil spring 6b.
Release the locking of the lever 25 by b. Then,
The valve body 22 is rotated in the direction of the arrow by the biasing force of the mainspring 24 to open the valve. Therefore, the water in the water pipe 5 flows into the valve chamber 21.
Water is sprayed from the nozzle 6 through the nozzle 6.

When the fire is extinguished and the temperature reaches normal temperature by the time the valve body 22 rotates, for example, once, the coil 26a of the double coil 26
Becomes soft. Since the coil 26 stands upright due to the coil spring 26b and locks the lever 25, the valve body 22 is kept closed and watering is stopped. Note that it is sufficient to provide sufficient rotational energy to the mainspring.

〔Effect of the invention〕

As described above, according to the present invention, after a fire occurs, the valve body injects and sprays a certain amount of water for a certain period of time by the rotating means, so that the fire can be extinguished within the receiving area of one sprinkler without wasting water. Enough water can be supplied to extinguish the fire. Also, even if the fire goes out and the temperature drops midway through, the valve will close.

Therefore, damage to products can be kept to a minimum, and there is no drop in water pressure due to water consumption.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG.
The figure is a sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view of Figure 1.
4 is a schematic side view of the double coil of this embodiment. 5... Water pipe, 6... Nozzle, 24... Valve seat, 22...
Fan-shaped valve body, 24...mainspring, 26...double coil, 26a...coil made of shape memory alloy,
26b...Coil spring.

Claims (1)

[Claims] 1. A sprinkler in which a valve is provided between a water pipe and a nozzle, which includes a circular valve chamber and a valve body that is provided in the valve chamber and rotates to open and close a passage, and a rotating means for rotating the valve body. A sprinkler comprising a locking means for locking the valve body in a closed position when the temperature is low and releasing the lock of the valve body when the temperature is high.