JPH0450048Y2 - - Google Patents

Description

[Detailed explanation of the invention] a. Purpose of the invention (industrial application field) The pressure accumulation type automatic fire extinguishing system according to this invention is installed in a restaurant kitchen, etc., and automatically sprays extinguishing agent from a nozzle when a fire occurs. This is to ensure that the automatic fire extinguishing system is activated.

(Prior art) A sensor for detecting a fire and a nozzle for spouting extinguishing agent are installed in a place where fire is likely to occur, such as near a range in a restaurant or inside a duct.
BACKGROUND ART It is widely used to automatically spray extinguishing agent when a fire occurs to quickly extinguish the fire in the initial stage.

4 and 5 show such an automatic fire extinguishing device installed in a kitchen. Range 1 on the floor top
A hood 2 for collecting smoke is suspended above the hood 2, and a duct 3 for exhausting smoke is provided above the hood 2. A sensor 4 for fire detection and a nozzle 5 for spouting extinguishing agent are provided on the inner surface of the hood 2 and the inside of the duct 3, and an automatic fire extinguishing device 8, which is installed on a wall or the like, is connected by a conductor 6 and a hose 7, respectively. 8
It is connected to the.

When a fire occurs, the control circuit attached to the automatic fire extinguishing devices 8, 8 starts each automatic fire extinguishing device 8, 8 based on the signal from the sensor 4, and the plurality of nozzles 5, 5
Spray extinguishing agent all at once.

Among these automatic fire extinguishing devices, relatively simple devices installed in restaurant kitchens, etc. use a small capacity extinguishing agent container like a general small fire extinguisher, and when a fire occurs, the extinguishing agent container is released. A flow path leading to the hose 7 is opened so that extinguishing agent can be sent to the nozzle 5 through the hose 7.

Among such automatic fire extinguishing devices, a fire extinguishing agent container 9 is installed in advance.
As shown in FIG. 6, the pressure accumulating type automatic fire extinguishing system, which is filled with pressure gas, has a fire extinguishing agent container 9 inside a lid 11 that is attached to the upper end opening of the extinguishing agent container 9 with a cap nut 10. A valve 20 for opening and closing a flow path between a siphon pipe 18 whose lower end is opened and a discharge port 19 communicating with a nozzle for spouting extinguishing agent via a hose 7 (FIG. 5) is provided at the bottom of the pipe. The activation rod 12 with the valve 29 fixed to its lower end is supported by the lid 11 so as to be able to rise and fall freely, and the handle 13 fixed to the lid 11 supports the middle part of the lever plate 15 by means of a shaft 14. ing. One end of this lever plate 15 engages with the upper end of the activation rod 12, and in the event of a fire, a drive unit 17 moves the pin 16 upwardly below the other end of the lever plate 15 based on a signal from the sensor 4. , the activation rod 12 is pushed down to open the valve 20 and activate the fire extinguishing system.

A small amount of high-pressure gas generating agent such as gunpowder and ignition means such as nichrome wire are housed in the drive unit 17, and the fire extinguishing device is to be activated from the control circuit based on the signal from the sensor 4. When a signal is sent, the nichrome wire ignites the gunpowder, causing the pin 16 to protrude upward with force, and the lever plate 15 is moved to the sixth position.
Rotate counterclockwise in the figure to lower the activation rod 12 and activate the fire extinguishing system.

In the illustrated example, the activation lever 12 is manually pushed down by rotating around the shaft 33 so that the fire extinguishing system can be activated manually even before the drive unit 17 is activated. A lever 34 is provided.

(Problems to be Solved by the Invention) However, in the conventional pressure accumulation type automatic fire extinguishing system constructed and operated as described above, the following disadvantages occur.

That is, the pin 16 provided on the drive section 17
Since the pin 16 is loosely fitted into the cylindrical bracket 21 fixed to the pin 16, the high pressure gas generated in the high pressure gas generating section 22 is transferred between the outer circumferential surface of the pin 16 and the inner circumferential surface of the bracket 21 in a short period of time. leaks to the outside through the gaps between them.

On the other hand, the upper end of this pin 16 faces the lever plate 1
The other end of 5 is a compression spring 23 (corresponding to the first spring of the present invention) for holding the valve 20 in a closed state.
Pin 1 loses the pushing force caused by the pressure gas because it is constantly being pushed upward by the strong elasticity of the pin 1.
6 immediately descends based on the elasticity of the compression spring 23, and the valve 20 is also closed.
For this reason, while the pressure gas and the fire extinguisher remain in the fire extinguisher container 9, the jetting of the fire extinguisher from the spout 19 stops, making it impossible to perform sufficient fire extinguishing work.

O
This inconvenience can be eliminated by blocking with a ring or the like, but if there is no escape for the extremely high-pressure driving gas generated in the high-pressure gas generating section 22, there is a risk that the casing of the generating section 22 will burst. Because of this, it cannot be adopted.

The pressure accumulation type automatic fire extinguishing system of the present invention eliminates the above-mentioned inconveniences.

(Means for solving the problem) The pressure accumulation type automatic fire extinguishing system of the present invention, like the conventional pressure accumulation type automatic fire extinguishing system described above, automatically starts the fire extinguisher based on the signal from the fire detector. The extinguishing agent in the extinguishing agent container is jetted out from the nozzle by the pressure gas filled in the extinguishing agent container in advance.

The lid attached to the top opening of the extinguishing agent container has
A starting rod is supported that opens a valve built into this lid body when pressed down to discharge extinguishing agent, and a handle fixed to this lid body with an open upper surface shaped like a gutter is connected to the middle part of the lever plate by a horizontal shaft. It is pivoted so that it can swing freely. One end of the lever plate is engaged with the upper end of the activation lever, and is provided in at least one of a portion between the lever plate and the handle, and a portion between the activation rod and the lid body. The first spring provides elasticity in the upward direction to this activation rod.

In addition, the handle has a mechanism that pushes up the other end of the lever plate based on a signal from a fire detector when a fire occurs.
A drive unit is provided which pushes down an activation rod engaged with one end of the lever plate to open the valve and activate the fire extinguisher.

Furthermore, in the pressure accumulation type automatic fire extinguishing system of the present invention, the lever plate is located closer to the end of the lever plate than the shaft to which the lever plate is pivoted on the side of the handle, and the other end of the lever plate is connected to the drive unit. A through hole is bored at a position that is exposed from the end of the lever plate only when it is pushed up. A guide cylinder is fixed at a position on the outer surface of the handle that aligns with this through hole, and a stopper is provided inside the guide cylinder with elasticity in the direction of protruding inward of the handle by a second spring. is loosely fitted.

(Function) The function of the pressure accumulation type automatic fire extinguishing system of the present invention configured as described above is as follows.

When a fire occurs and the control circuit sends a signal to start the fire extinguisher based on the signal from the sensor, the ignition means such as nichrome wire built into the drive unit generates high-pressure gas such as gunpowder. The agent is ignited to force the pin to protrude upwards, and the lever plate pivotally attached to the upper surface of the handle by the intermediate shaft is rotated to lower the activation lever.

When the pin moves the lower edge of the other end of the lever plate above the hole drilled in the side of the handle,
The stopper, which until then had been retracted inside the guide tube against the elasticity of the spring, projects inside the handle due to the elasticity of the spring, and the tip of this stopper enters below the lever plate.

For this reason, even after the force that pushes the pin of the drive unit upward is gone, the other end of the lever plate is prevented from descending by the tip of the stopper, and the activation lever is held back by the elasticity of the compression spring. There will no longer be any possibility of it being lifted up. Therefore, the valve built into the lid remains open, and as long as the pressure gas and extinguishing agent remain in the extinguishing agent container, the extinguishing agent continues to be ejected.

(Example) Next, the present invention will be explained in more detail with reference to drawings showing examples.

Figures 1 to 3 show an embodiment of the present invention. Figure 1 is a side view of the upper part of the automatic fire extinguishing system, Figure 2 is a plan view of the same, and Figure 3 is a sectional view taken along line A-A in Figure 2. be.

The lid 11 attached to the upper opening of the fire extinguishing agent container 9 (see FIG. 6; omitted in FIGS. 1 to 3) with a cap nut 10 is pressed down.
It supports an actuating rod 12 (see FIG. 6) that opens a built-in valve and discharges the extinguishing agent by the pressure of the pressurized gas prefilled in the extinguishing agent container 9.

A handle 1 with an open upper surface shaped like a gutter fixed to the lid body 11
As in the case of the conventional automatic fire extinguishing system described above, the intermediate portion of a lever plate 15 is pivotally attached to the lever plate 15 by a horizontal shaft 14. One end of this lever plate 15 is engaged with the upper end of the activation rod 12.
A spring such as a compression spring or a helical spring is provided in at least one of the portion between the lever plate 15 and the handle 13 and the portion between the activation rod 12 and the lid 11. This provides elasticity in the direction in which the activation rod 12 tends to rise.

Further, on the lower surface of the end of the handle 13, the lever plate 15 is installed based on a signal from a fire detector when a fire occurs.
A drive section 17 is provided to push up the other end. The structure of this drive section 17 is similar to the structure of the drive section 17 in the conventional automatic fire extinguishing system described above, and by pushing up the pin 16 of this drive section 17, the above-mentioned starting lever is activated via the lever plate 15. 12 is pushed down to open the valve 20.

The above-mentioned configuration is similar to the conventional pressure accumulation type automatic fire extinguishing system described above, but in the pressure accumulation type automatic fire extinguishing system of the present invention, a pin 16 of the drive unit 17 is attached to the side surface of the handle 13. A holding portion 24 is provided to hold the lever plate 15 in the same state after being rotated in the fire extinguisher activation direction.

That is, the lever plate 15 is located closer to the other end of the lever plate 15 (to the right in FIGS. 1 and 2) than the shaft 14 that pivots the lever plate 15 to the handle 13, and the other end of the lever plate 15 is closer to the drive portion 17. The holding portion 24 is placed at a position where it is exposed below the lower edge of the other end of the lever plate 15 only when pushed up by the pin 16 of the lever plate 15.
A through hole 25 is provided for mounting the.

A horizontal cylindrical guide tube 26 is fixed on the outer surface of the handle 13 at a position aligned with the through hole 25. A bolt 28 having a through hole 27 formed in the center is screwed into the outer end opening of the guide tube 26, and the inner end of the cylindrical main portion 29a is inserted into the through hole 27 of the bolt 28. A main portion 29a of the stopper 29 having a large diameter portion 29b is slidably inserted therein. The inner end surface of the bolt 28 and the stopper 29
A compression spring 30 is provided between the large diameter portion 29b of the
This compression spring 30 causes the stopper 29 to hold the handle 1.
3 is given elasticity in the direction of protruding inward. Reference numeral 31 designates a ring-shaped finger rest supported on the outer end of the stopper 29 for hanging the finger when the stopper 29, which has once protruded inwardly from the handle 13, is pulled out.

In the pressure accumulation type automatic fire extinguishing system of the present invention configured as described above, when a fire occurs and a signal to start the fire extinguishing system is sent from the control circuit based on the signal from the sensor, An ignition means such as a nichrome wire built into the drive part 17 ignites a high-pressure gas generating agent such as gunpowder, causing the pin 16 to protrude upward with force, and is pivoted to the upper surface of the handle 13 by the shaft of the intermediate part 14. The activated lever plate 15 is rotated to lower the activation rod 12.

The lever plate 15 is rotated by the pin 16, and the lower edge of the other end of the lever plate 15 is connected to the handle 13.
When the stopper 29 moves above the through hole 25 formed in the side surface of the guide cylinder 26, the stopper 29, which had been retracted inside the guide cylinder 26 against the elasticity of the compression spring 30, is moved by the elasticity of the compression spring 30. A large diameter portion 29b at the tip of this stopper 29 projects inside the handle 13.
enters below the other end of the lever plate 15, and the lever plate 1
5 is prevented from rotating in the opposite direction to when activating the automatic fire extinguishing system.

Therefore, even after the high pressure gas generated in the drive section 17 leaks and the force pushing the pin 16 of the drive section 17 upward is lost, the other end of the lever plate 15 will not descend. Also, the activation rod 15 is no longer raised by the elasticity of the spring. Therefore, the valve 20 built into the lid 11 remains open, and as long as the pressure gas and the extinguishing agent are present in the extinguishing agent container 9, the extinguishing agent continues to be ejected.

In Fig. 1, 32 is a mark plate supported by a shaft 32a (see Fig. 6) made of soft material such as synthetic resin. When the shaft 32a is cut by the lever plate 15, it falls from the side of the handle 13.

Further, in the above-described embodiment, the holding portion 24 is provided offset to the lower side of the other end of the lever plate 15;
The holding portion 24 can also be provided on one side above one end of the lever plate 15.

c. Effects of the invention The pressure accumulating automatic fire extinguishing system of the present invention is configured as described above, so that once a fire has started, the fire extinguishing system can still contain extinguishing agent and pressurized gas in the extinguishing agent container. There is no need to stop spraying the extinguishing agent during the process, and the initial fire extinguishing work can be carried out reliably.

Japanese Utility Model Publication No. 52-3118 describes a fire extinguisher equipped with a detent lever as a device to activate the fire extinguisher by detonating the gunpowder in response to a signal from a sensor in the event of a fire, and to keep the fire extinguisher in operation. However, since this fire extinguisher has a starting device and a holding device using a detent lever attached to the lid, the lid has a structure different from that of a normal fire extinguisher lid, and is different from a normal lid. Although it is troublesome that they have to be manufactured separately, in the pressure accumulation type automatic fire extinguishing system of the present invention, the main mechanisms for automatic fire extinguishing, such as the starting part and the holding part, are all attached to the handle 13. Because it can be attached to a fire extinguisher in a factory, it can be used interchangeably as a regular fire extinguisher and an automatic fire extinguisher by simply using a common lid and replacing only the handle. This has a great effect of simplifying the pottery manufacturing process.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, where Figure 1 is a side view of the upper part of the automatic fire extinguishing system, Figure 2 is a plan view of the same, Figure 3 is a sectional view taken along line AA in Figure 2, FIG. 4 is a front view showing the automatic fire extinguishing device installed in a kitchen, FIG. 5 is a side view of the same, and FIG. 6 is a half-part vertical side view showing an example of the starting device. 1...Microwave, 2...Hood, 3...Duct,
4...Sensor, 5...Nozzle, 6...Conductor, 7...
... Hose, 8 ... Automatic fire extinguishing device, 9 ... Fire extinguisher container, 10 ... Bag nut, 11 ... Lid, 12 ...
Starting rod, 13... Handle, 14... Shaft, 15... Lever plate, 16... Pin, 17... Drive unit, 18...
Siphon pipe, 19... spout, 20... valve, 21
... Bracket, 22 ... High pressure gas generation section, 23
... Compression spring, 24 ... Holding part, 25 ... Through hole,
26...Guide tube, 27...Through hole, 28...Bolt, 29...Stopper, 29a...Main part, 29
b...Large diameter portion, 30...Compression spring, 31...Finger rest, 32...Marker plate, 33...Shaft, 34...Manual lever.

Claims (1)

[Scope of utility model registration request] This is an automatic fire extinguishing system that automatically activates a fire extinguisher based on a signal from a fire detector, and uses pressurized gas filled in the extinguishing agent container in advance to spray out the extinguishing agent in the extinguishing agent container from a nozzle. The lid attached to the upper opening of the fire extinguishing agent container supports an activation rod that opens a valve built into the lid when pressed down to discharge the extinguishing agent, and a gutter-shaped trough fixed to the lid. The middle part of the lever plate is swingably pivoted to the handle with the open top surface by a horizontal axis, and the first spring provides elasticity in the upward direction to one end of the lever plate that engages with the upper end of the activation rod. The handle is provided with a drive unit that pushes up the other end of the lever plate based on the signal from the fire detector in the event of a fire, and the edge of the lever plate is further pushed up than the shaft to which the lever plate is pivoted on the side of the handle. Close to the club,
Furthermore, a through hole is drilled at a position that is exposed from the end of the lever plate only when the other end of the lever plate is pushed up by the drive unit, and the handle is fixed at a position that aligns with this through hole on the outer surface of the handle. A pressure accumulating automatic fire extinguishing system comprising a stopper which is elastically applied to the inner side of the handle by a second spring and loosely fitted inside the guide cylinder.