JPH024690Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a fire extinguishing device for fire inside a duct.

[Prior art] A fire in a duct can occur, for example, when spatter during welding from a welding site in a factory etc.
It is often caused by ignition of dust that is attracted into the duct and accumulated in the duct.

The method for extinguishing a fire inside a duct is as follows:
Conventionally, methods used include (a) injecting a large amount of water into the duct to cool and extinguish the fire, and (b) installing fire sprinklers etc. throughout the duct and spraying water or fire extinguishing agent manually or automatically. (c) Installing a fire damper at the end of the exhaust duct to extinguish the fire by suffocation.

[Problem to be solved by the invention] However, in method (a), a large amount of water is injected to extinguish the fire while cooling the duct, so it takes time to completely extinguish the fire. In addition, in the method (b) above,
Depending on the location of the fire, it may not be possible to extinguish the fire. Furthermore, in the method (c) above, depending on the type of combustion material (dust or spatter sucked into the duct) in the duct, a scorched fire may occur and cannot be extinguished.

As described above, conventional fire extinguishing methods are insufficient to quickly and reliably extinguish fires in ducts.

Furthermore, in the methods (b) and (c), since sprinklers, fire dampers, etc. are installed inside the duct, the installation and maintenance thereof requires a considerable amount of cost, resulting in high costs.

The present invention was developed in view of the above-mentioned conventional circumstances, and aims to provide a fire extinguishing device for fires in ducts that can speed up and ensure the extinguishment of fires in ducts and reduce costs. That is the purpose.

[Means for Solving the Problems] The fire extinguishing system for fires in ducts of the present invention that solves the above problems includes a high-pressure extinguishing fluid supply source capable of supplying extinguishing fluid such as water or extinguishing agent at high pressure, and a high-pressure extinguishing fluid supply source. A hose connected to the fluid supply port of the source, and a hose connected to the tip of the hose and placed in the duct to turn the extinguishing fluid onto the inner wall of the duct around the tip of the hose and spray it radially. and an injection nozzle having a nozzle opening.

[Function] According to the above means, the injection nozzle is placed in the duct where the fire occurred, and the extinguishing fluid from the high-pressure extinguishing fluid supply source is supplied to the injection nozzle through the hose, so that the extinguishing fluid flows through the nozzle of the injection nozzle. It is sprayed radially from the mouth toward the inner wall of the duct around the tip of the hose in a folded manner. As a result, the injection nozzle moves through the duct while towing the hose using the injection pressure of the extinguishing fluid as a thrust, thereby reaching the fire site in the duct and extinguishing the fire.

[Example] An example of the present invention will be described below with reference to the drawings.

In FIG. 1, which shows the state of use of the fire extinguishing system for fires in ducts, an exhaust duct 2 is installed near the ceiling in a factory building 1. This duct 2
is equipped with an intake port 2a that is desired for welding sites, other work sites, etc. As is well known, the exhaust side end of the duct 2 is provided with an intake fan for sucking contaminated air from the site through the intake port 2a and discharging it outdoors.

Next, a duct fire extinguishing device for extinguishing a duct fire occurring in the duct 2 will be described. Incidentally, a fire in the duct occurs when, for example, spatter during welding from the welding site is sucked into the duct 2, attaches to the dust 12 accumulated in the duct 2, and ignites.

The fire extinguishing system for fire in a duct is composed of a high-pressure extinguishing fluid supply source 3, a hose 7 connected to a fluid supply port of the extinguishing fluid high-pressure supply source 3, and an injection nozzle 9 connected to the tip of the hose 7. Ru.

The extinguishing fluid high-pressure supply source 3 supplies extinguishing fluid such as water or extinguishing agent at high pressure, and includes a truck 8 that can be moved in a desired direction, and a tank 4 that is installed on the truck 8 and stores extinguishing fluid. , and a high-pressure pump 5 for supplying this extinguishing fluid at high pressure.

A hose 7 is connected to a fluid supply port of a high pressure pump 5 of the fire extinguishing fluid high pressure supply source 3. hose 7
is wound up so that it can be pulled out by the hose reel 6 on the trolley 8 in case of emergency.

A cylindrical attachment member 10 is attached to the distal end of the hose 7, and the base end of a metal injection nozzle 9 is screwed onto this attachment member 10.

The injection nozzle 9 is formed by a cylindrical nozzle main body 9a and an umbrella portion 9b projecting from the tip of the nozzle body 9a. A nozzle opening 9c is formed at the boundary between the nozzle body 9a and the umbrella portion 9b. Nozzle mouth 9
A predetermined number of holes c extend radially through the nozzle main body 9a in a circumferential direction, and are obliquely inclined rearward (toward the hose 7) from the inside to the outside.

In the fire extinguishing system for fire inside a duct, when extinguishing a fire occurring inside the duct 2, first move the extinguishing fluid high pressure supply source 3 to the vicinity of the intake port 2a of the duct 2, and then move the injection nozzle 9 there. Intake port 2
At the same time, the high pressure pump 5 of the fire extinguishing fluid high pressure supply source 3 is started.

By operating the high-pressure pump 5, extinguishing fluid in the tank 4 is supplied to the injection nozzle 9 through the hose 7. The supplied extinguishing fluid is turned back and radially injected from the nozzle opening 9a of the injection nozzle 9 toward the inner wall of the duct 2 around the distal end side of the hose 7. The extinguishing fluid injected from the nozzle port 9a is indicated by the reference numeral 11 in FIG.

Then, the injection nozzle 9 receives a thrust P proportional to the injection pressure of the extinguishing fluid injected from the nozzle port 9a.
(See Figure 2) is in effect. Therefore, the injection nozzle 9 moves inside the duct 2 toward its exhaust side while pulling the hose 7 by the thrust P generated by injecting the extinguishing fluid.

Then, when the injection nozzle 9 reaches the fire site (the part of the dust 12) in the duct 2, the fire is extinguished.

In addition to the injection nozzle of the above-mentioned embodiment, the injection nozzle 9 may also be used, as shown in FIG. Any material having the function of being able to spray radially toward the rear may be used.

Further, in the above embodiment, the fire extinguishing fluid high pressure supply source 3 is exemplified as having a tank 4, a high pressure pump 5, etc., but it is also possible to use a fire hydrant capable of supplying high pressure water as the fire extinguishing fluid high pressure supply source 3. .

[Effects of the invention] According to the invention, extinguishing fluid is supplied from a high-pressure extinguishing fluid supply source to an injection nozzle placed in a duct via a hose, and the extinguishing fluid is supplied from the nozzle opening of the injection nozzle to the tip of the hose. By turning the fire extinguishing fluid toward the inner wall of the duct around the side and injecting it radially, the injection nozzle uses the injection pressure of the extinguishing fluid as a thrust to move inside the duct while towing the hose, extinguishing the fire inside the duct. Because it is a fire extinguisher, extinguishing the fire can be done more quickly and reliably than conventional methods.

In addition, since the duct does not require any incidental equipment,
Compared to conventional sprinklers, fire dampers, etc.
Cost reduction can be achieved.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the state of use of an in-duct fire extinguishing system according to an embodiment of the present invention, Fig. 2 is a partially cutaway side view showing its main parts, and Fig. 3 is an illustration of another example of an injection nozzle. FIG. 3...Fire extinguishing fluid high pressure supply source, 7...Hose, 9
...Injection nozzle, 9a...Nozzle opening.

Claims (1)

[Scope of utility model registration request] A fire extinguishing fluid high pressure supply source capable of supplying a fire extinguishing fluid such as water or extinguishing agent at high pressure, a hose connected to the fluid supply port of the extinguishing fluid high pressure supply source, and a hose connected to the end of the hose and inserted into the duct. and an injection nozzle having a nozzle opening that bends the extinguishing fluid to the inner wall of the duct around the distal end side of the hose and injects it radially.