JPH0346773Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fire extinguishing device that detects fires in cooking ranges, fryers, etc. and extinguishes them manually or automatically.

Traditionally, in restaurants and hotel kitchens, hoods were installed above cooking ranges, fryers, etc.
The hood collects oil smoke from microwaves, fryers, etc., and exhausts it through a duct using a forced exhaust fan.

By the way, it is difficult to extinguish a fire in the event of a fire due to oil adhering to the hood and ducts due to cooking. Therefore, a fire extinguishing nozzle is installed in the hood, and the extinguishing nozzle is activated manually or automatically using sensor output. Fire extinguishing devices that spray more water or extinguishing agents are being considered.

However, if the oil in the cooking pot catches fire, the flames will spread to the surrounding area, and even if water or extinguishing agent is sprayed from the extinguishing nozzle toward the microwave, fryer, etc., the flame will not be completely extinguished. There was a risk that the fire would spread to the surrounding area and cause burns to nearby people.

The present invention was developed in view of these problems, and in the event of a fire, a water film is formed tightly around the hood installed above the microwave, suppressing the spread of flames to the surrounding area, and safely allowing the microwave to cook. An object of the present invention is to provide a fire extinguishing device capable of extinguishing fire.

In order to achieve this objective, the present invention installs a plurality of drench layer nozzles on the outside of the hood that form a water film toward the lower side of the hood. It is installed so that 1/4 to 3/4 is against the side wall of the hood.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. Although the present invention can be used in fire extinguishing devices for cooking ranges, fryers, etc., the case where it is used in a range will be taken as an example below.

First, to explain the configuration, 1 is a microwave stand,
A cooking range 2 is placed on top of the range 1, and a gas cutoff valve 3 is installed inside the range 1.
Gas is supplied via.

A downward-opening hood 4 is installed above the range 2, and an exhaust duct 5 is drawn out from the center of the hood 4. In the middle of the exhaust duct 5, there is a fire prevention damper 6 for closing the duct in the event of a fire, and a forced exhaust system. A fan 7 is provided.

Inside the hood 4 is a pair of dampers 9 that can be closed freely.
is provided, and the damper 9 is moved between the open position shown in the figure and the 9'
It is driven to the closed position where it abuts against the receiving seat 10 as shown in FIG. A pair of grease filters 11 are installed in a substantially V-shape inside the damper 9, and smoke from the range 2 and the above are passed through the grease filters 11 to remove oil and soot.

A temperature sensor 12 for detecting a range fire is installed inside the grease filter 11, and the output of the temperature sensor 12 is given to a control unit that will be explained later, and fire monitoring is performed based on the detected temperature.

On the other hand, a fire extinguishing nozzle 13 for discharging water or a fire extinguishing agent towards the range 2 is installed on the right side of the hood 4, that is, on the inner wall of the hood, which is the lower side of the damper 9.
Furthermore, cleaning water is spouted to the upper part of the hood 4, which is inside the damper 9, to clean the grease filter 11 during cleaning, and cooling water (the same cleaning liquid) is sprayed to cool the inside of the hood 4 in the event of a fire. A plurality of cleaning cooling nozzles 14 are installed.

Further, on the outside of the hood 4, a drench jet nozzle 15 is installed downward along the side surface of the hood 4 for forming a water film around the hood 4 in the event of a fire.

The installation position of this drench yarn nozzle 15 is the second one.
It is defined as shown in the figure.

That is, the drench yarn nozzle 15 is equipped with a fire extinguishing water radiation pattern 16 having a predetermined radiation angle θ, and as shown for the drench yarn nozzle 15 on the right side of the hood, the radiation pattern 16 has a width A at the lower edge 4a of the hood 4. have. With respect to this width A, the radial direction of the drencher nozzle 15 is determined so that B of the width A on the hood 4 side hits the side wall of the hood. The radial direction of the drench yarn nozzle 15 is determined so that the ratio of the width B for application is 1/4 to 3/4 of the width A. On the other hand, the drench yarn nozzles 15 arranged around the hood 4 are arranged in the lateral direction so that the intersecting position of the water film between the adjacent drench yarn nozzles 15 is located above the lower edge of the hood. determining the interval.

By setting the radial direction of the drench yarn nozzle 15 like this, the drench yarn nozzle 1 on the left side of the hood
5, the inside of the radiation pattern 16 hits the side wall of the hood 4, forming a water film around the hood 4 with a width shown by diagonal lines.
The flame is reliably prevented from blowing out through the gap between the side wall of the drench tank and the water film from the drench tank nozzle 15.

FIG. 3 is a system diagram of a fire extinguishing system intended for the fire extinguishing equipment shown in FIG.

In FIG. 3, 18 is a control unit for opening and closing the fire prevention damper 6 of the exhaust duct, the fan 7 for forced exhaust, the temperature sensor 12 for detecting fire, and the damper 9 provided in the range fire extinguishing equipment shown in FIG. The damper drive device 8 of the microwave oven and the gas cutoff valve 3 provided on the cooktop 1 are connected to each other by signal lines, and when the temperature detected by the temperature sensor 12 reaches a predetermined fire temperature, it is activated automatically or manually. fire extinguisher nozzle 13 and drench ear nozzle 15,
Furthermore, it outputs a control signal to discharge water or extinguishing agent from the cleaning cooling nozzle 14.

20 is a fire extinguishing/cleaning unit;
The cleaning unit 20 is provided with a storage tank for water and/or a fire extinguishing agent, a fire pump that supplies water or a fire extinguishing agent under pressure, and an electromagnetic pump for each system of the fire extinguishing nozzle 13, cleaning/cooling nozzle 14, and drench tank nozzle 15. Via the valves 21, 22, 23 water, cleaning agent or extinguishing agent can be supplied.

Next, the operation of the above embodiment will be explained.

If oil in a pot placed on microwave 2 catches fire during cooking and a microwave fire occurs, temperature sensor 1
Extinguishing is controlled by automatic extinguishing based on the temperature detected by 2 or by manual operation of an operating switch provided in the control unit 18.

This fire extinguishing control involves closing the gas cutoff valve 3 to stop the gas supply to the range 2 in response to a control signal from the control unit 18, stopping the fan 7 provided in the exhaust duct 5, and closing the fire damper 6. , and further causes the damper 9 to be closed by the damper drive device 8. Next, control unit 18
A fire extinguishing control signal is sent to the fire extinguishing/cleaning unit 20, and the solenoid valves 21, 22, and 23 are opened at the same time as the fire pump (not shown) is activated. Water or a fire extinguishing agent is sprayed out, and when the solenoid valve 21 is opened, water is sprayed into the hood 4 from the cleaning/cooling nozzle 14 installed inside the hood 4 to cool the hood 4 heated by the flame, and the exhaust duct 5 The drench tank nozzle 1 installed around the outside of the hood 4 can be opened by opening the solenoid valve 21.
5, and a water film is formed around the hood 4 by jetting water from the drench tank nozzle 15.

Formation of a water film by spraying from the drench yarn nozzle 15 is as shown in FIG. 2, as shown in FIG. Because the width part is placed against the side wall of the hood,
Drencher nozzle 1 without any gaps around hood 4
5 can be formed and wrapped in a water film, which can reliably prevent the spread of fire due to the spread of the flame to the outside and the risk of burns to people near the stove. A microwave fire can be reliably extinguished by being wrapped in the formed water film.

As explained above, according to the present invention, a hood installed above a cooking range, etc. is equipped with a fire extinguishing nozzle for extinguishing the range, etc., and water or fire extinguishing is performed manually or automatically from the nozzle according to the sensor output. In a fire extinguishing system that extinguishes a fire by releasing a chemical,
A plurality of drench layer nozzles are provided at a position surrounding the outside of the hood to form a water film surrounding the lower side of the microwave, etc., and each of the drench layer nozzles is set at a position that wraps around the outside of the hood. 4 to 3/4 is installed so that it is in contact with the side wall of the hood, so even if the flames flare up when a microwave fire occurs, there is no gap between the side of the hood and the water film of the drench tank nozzle, which increases the resistance to the fire force. Because it has a certain water film thickness, it can prevent flames from spreading around the hood and cause the fire to spread, and prevent people near the range from getting burnt, thereby extinguishing range fires reliably and safely. I can do it.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Fig. 2 is an explanatory diagram showing the state of water film formation around the hood in the embodiment of Fig. 1, and Fig. 3 is the equipment configuration of Fig. 1. FIG. 1 is an overall configuration diagram of the present invention. 1: Microwave stand, 2: Range, 3: Gas cutoff valve,
4: Hood, 5: Exhaust duct, 6: Fire damper,
7: Fan, 8: Damper drive device, 10: Receiving seat, 11: Grease filter, 12: Temperature sensor, 13: Fire extinguishing nozzle, 14: Cleaning/cooling nozzle, 15: Drencher nozzle, 16: Radiation pattern, 18: Control unit, 20: Fire extinguishing/cleaning unit, 21, 22, 23: Solenoid valve.

Claims (1)

[Claims for Utility Model Registration] A hood installed above a cooking range or fryer, and a fire extinguishing nozzle installed in the hood to extinguish the cooking range, fryer, etc., and which can be operated manually or by sensor output. In a fire extinguishing device that automatically spouts water or extinguishing agent from the fire extinguishing nozzle in response to 1. A fire extinguishing system comprising: a plurality of drench ear nozzles, each of which is installed so that 1/4 to 3/4 of the width of the radiation pattern at the lower edge of the hood hits the side wall of the hood.