JP2023000626A - Fire extinguisher for range hood - Google Patents

Abstract

To provide a fire extinguisher for a range hood, allowing even a person having no specialized knowledge to easily perform attachment of a fire-extinguishing agent container to a range hood, replacement, maintenance, recovery or the like.SOLUTION: In a fire extinguisher for a range hood, the range hood comprising fan and a current plate (27) mounted with one or more fire-extinguishing agent containers filled with a fire-extinguishing agent, with an ejection port of the fire-extinguishing agent arranged directed downward, the fire-extinguishing agent container comprises a mouthpiece (31) having an ejection port, and a protrusion (32) having a shape which is formed in a root of the mouthpiece so as to surround the mouthpiece, and is not circular in a top face view; an aperture (27a) having a shape corresponding to the protrusion and permitting insertion of the mouthpiece is formed in a prescribed position of the current plate; and the fire-extinguishing agent container is arranged inside the current plate, with the protrusion engaged with the aperture, and a portion projecting from the current plate, of the mouthpiece, is locked by locking means (33), thereby, the fire-extinguishing agent container is fixed to the current plate.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a fire extinguishing device installed in a range hood of a kitchen for spraying a fire extinguishing agent against a fire caused by a stove.

2. Description of the Related Art Conventionally, a fire extinguishing device that sprays a fire extinguishing agent when a fire breaks out in a range equipped with a stove is known. Inventions related to fire extinguishing devices for microwave ovens are disclosed in Patent Documents 1, 2, and 3, for example.
Among them, in Patent Document 1, a fire extinguisher (fire extinguisher container) enclosing a fire extinguisher in the range hood, a fire extinguisher ejection part, and a conduit connecting the two are provided, and a bellows-shaped fireproof structure is provided around the outer circumference of the range hood. An invention is disclosed in which the extensible body is arranged in a contracted and locked state, and fire extinguishing agent spraying means is provided for releasing the locked state of the fireproof extensible body and extending it as the extinguishing agent is injected. .

In addition, in Patent Document 2, a fire extinguisher container, a fire extinguisher injection port, and a connection pipe are provided in the range hood, and a slit-shaped diffusion nozzle is adopted as the injection port so that the fire extinguisher evenly falls on the top plate of the gas stove. The invention is described.
In Patent Document 3, a storage container that stores a liquid extinguishing agent without pressure and has a discharge port for dropping the extinguishing agent, an installation means for installing the storage container in a building, and a fire source The invention relates to an automatic fire extinguishing device provided with operating means for switching the discharge port to a state in which the fire extinguishing agent is dripped from above the fire generating source by a predetermined temperature rise.

JP-A-10-246482 JP 2018-146492 A JP 2006-325952 A

The fire extinguishing devices described in Patent Documents 1 and 2 both connect the fire extinguisher container and the injection port with a pipe (pipe), and include a fireproof expansion and contraction body on the outer circumference of the range hood, and control The structure is complicated, such as having a communication unit in the unit.
Therefore, when installing the fire extinguishing device in the range hood, replacing or maintaining the fire extinguisher container, and restoring after operation, the work must be performed by a person with specialized knowledge, and the work becomes large-scale. In addition, since the arrangement of the extinguishing agent container is not devised, there is a problem that the range hood becomes large.

In addition, the fire extinguishing device described in Patent Document 3 includes a mounting base that can be fixed to a structure located above the stove and a guide supported in a cantilever state by the mounting base as an installation means for installing the storage container. and a moving body that is slidably supported along the guide and holds the storage container. There is a problem.

The present invention has been made under the above background, and its purpose is to enable even those who do not have specialized knowledge to install, replace, maintain, and install fire extinguisher containers on range hoods. To provide a fire extinguisher for a range hood which can be easily restored.
Another object of the present invention is to provide a range hood fire extinguishing device capable of disposing a fire extinguisher container in the range hood while avoiding an increase in the size of the range hood.

In order to solve the above problems, the invention according to the present application is
A range hood fire extinguishing device comprising one or more extinguishing agent containers filled with extinguishing agent attached to the rectifying plate of a range hood equipped with a fan and a rectifying plate with the ejection port of the extinguishing agent facing downward,
The fire extinguisher container includes a mouthpiece having the spout, and a protrusion having a non-circular shape in a top view formed at the base of the mouthpiece so as to surround the mouthpiece,
An opening having a shape corresponding to the convex portion and into which the base can be inserted is formed at a predetermined position of the rectifying plate,
The fire extinguisher container is arranged on the surface of the rectifying plate that is inside the cooker hood, the convex portion is fitted into the opening, and the part of the mouthpiece protruding from the rectifying plate is locked by a locking means. Thus, the extinguishing agent container is fixed to the current plate.
Here, typical examples of "non-circular shapes" are quadrilaterals and other polygons.

According to the above configuration, even a person who does not have specialized knowledge realizes a fire extinguishing device that can easily perform installation, replacement, maintenance, restoration, etc. of the fire extinguisher container to the range hood. be able to. Further, since the holes are formed in advance at predetermined positions of the current plate, the extinguishing agent container can be easily and accurately attached to the predetermined positions of the current plate.
Furthermore, since no pipe is required to connect the fire extinguisher container and the spout, the fire extinguisher container can be arranged in the range hood while avoiding an increase in the size of the range hood.

Here, preferably, a male screw is formed on the outer periphery of the mouthpiece, and the locking means is a nut that can be screwed onto the male screw.
According to this configuration, the fire extinguisher container can be easily attached to the rectifier plate of the cooker hood by using a common tool such as a spanner or a wrench.

Further, preferably, the aperture is formed as an elongated hole having the same width as the minimum width of the projection.
According to such a configuration, the position of the ejection port of the fire extinguisher container can be adjusted by moving the convex portion along the opening and then locking it with the locking means, thereby ejecting the extinguisher. can be adjusted optimally.

Further, desirably, a shielding plate is provided on the upstream side of the airflow above the rectifying plate generated by the rotation of the fan of the fire extinguisher container to block and detour the air flow toward the fire extinguisher container. do.
According to such a configuration, it is possible to prevent the extinguishing agent container from being directly exposed to the hot airflow from the stove and excessively increasing the temperature of the extinguishing agent container.

Moreover, desirably, the extinguishing agent container is configured to have a heat dissipation structure.
According to the above configuration, even if the temperature of the fire extinguisher container rises due to heat transfer from the rectifying plate, heat is radiated from the outer periphery of the container, thereby preventing the temperature of the fire extinguisher container from excessively increasing. can.

INDUSTRIAL APPLICABILITY According to the range hood fire extinguishing device of the present invention, even a person who does not have specialized knowledge can easily attach or replace a fire extinguisher container to a range hood, maintain it, and restore it. In addition, there is an effect that the extinguishing agent container can be arranged in the range hood while avoiding an increase in the size of the range hood.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows one Embodiment of the fire extinguisher for range hoods which concerns on this invention. It is a side view which shows the structure of the fire extinguishing apparatus of embodiment of FIG. (A) is a side view showing details of a fire extinguisher container that constitutes the fire extinguishing device of the embodiment, and (B) is a bottom view showing details of a current plate that constitutes the cooker hood. (A) is a bottom view showing a first modification of the shape of the opening of the current plate, and (B) is a bottom view of a second modification of the shape of the opening of the current plate. (A) is a bottom view showing a first modification of the extinguishing agent container, and (B) is a side view showing a second modification of the extinguishing agent container. It is a principal part top view which shows the modification of the fire extinguishing apparatus of embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show an embodiment of a range table and a range hood to which the range hood fire extinguishing device according to the present invention is applied. 1 and 2, FIG. 1 is a front view and FIG. 2 is a side view. The fire extinguishing device of this embodiment is provided in the range hood 20 above the range table 10 installed in a kitchen or the like.

As shown in FIGS. 1 and 2, the range table 10 is provided with three gas stoves 11A, 11B, and 11C at the top, and a slightly larger cooker hood 20 is provided above them so as to cover the entire range table 10. ing.
The cooker hood 20 includes a housing 21 including a hood portion 21A and an equipment storage portion 21B, which are formed of stainless steel plate or the like and have a rectangular shape when viewed from above. An exhaust fan 23 and a rotation motor 24 are arranged inside the housing portion 21B. The front frame of the hood portion 21A is provided with an operation portion 25 having switch push buttons for instructing ON/OFF of ventilation and lighting, and an illumination lamp is provided inside the front frame on the back of the operation portion 25. 26 (see FIG. 2) are provided. A translucent cover covers the lower part of the lighting lamp 26 .

Furthermore, the entire lower surface of the hood portion 21A is open, and a plate-like straightening plate 27 that is slightly smaller than the opening of the hood portion 21A is arranged in the lower portion of the housing 21 so as to cover the opening of the hood portion 21A. . The straightening plate 27 is made of a nonflammable material such as a metal plate having a thickness of about 1 mm. Air is drawn in through a gap of several centimeters in width, and is discharged through the exhaust duct 22 from the back area of the current plate 27 (the inner surface of the cooker hood). A filter 28 is provided between the rectifying plate 27 inside the range hood and the fan 23 . The exhaust duct 22 can be installed with a 90-degree orientation change in the horizontal plane.

The rectifying plate 27 is attached to the upper wall of the hood portion 21A by hanging metal fittings 29A and 29B (see FIG. 2) having locking portions provided on the lower surface of the upper wall of the hood portion 21A. They are suspended horizontally at intervals and are designed to be removable. The current plate 27 is positioned at substantially the same height as the lower end of the receptacle 21A. Although not shown, the rectifying plate 27 is formed with a rib having a height of about 10 mm, which protrudes upward along the peripheral edge by bending the peripheral edge upward, so as to prevent deformation. .

Of the hanging metal fittings 29A and 29B, the rear hanging metal fitting 29B is a hook type, and the front hanging metal fitting 29A has a stopper button with a built-in spring. When the finger is released from the stopper button, the side flanges of the rectifying plate 27 are sandwiched by stoppers and locked to prevent the rectifying plate 27 from moving up and down and to be fixed.

In the present embodiment, extinguishing agent containers 30A, 30B, and 30C filled with an extinguishing agent are placed in portions corresponding to right above the gas stoves 11A, 11B, and 11C of the rectifying plate 27, respectively, with their ejection ports facing downward. installed. The fire extinguisher containers 30A, 30B, and 30C are, for example, cylindrical metal containers each having a mouthpiece having a male screw formed on the outer periphery thereof and serving as an ejection port. At a predetermined position (right above the stove), openings are formed through which the mouthpieces of the extinguishing agent containers 30A, 30B, and 30C are inserted.

FIG. 3(A) is a side view showing the details of the extinguishing agent container as a specific example of the extinguishing agent containers 30A, 30B, and 30C constituting the fire extinguishing device of the embodiment, and FIG. 3(B) shows a range hood. A bottom view showing the details of the rectifying plate 27 that constitutes is shown.
As shown in FIG. 3(A), the extinguishing agent containers 30A, 30B, and 30C are provided with a mouthpiece 31 serving as an extinguishing agent ejection port at the center of the bottom wall, and a male screw is formed on the outer circumference of the mouthpiece 31. In addition, at the root (base) of the base 31, a detent projection 32 (see FIG. 5) having a height substantially equal to the thickness of the straightening plate 27 and having a quadrangular shape when viewed from above is formed.
Moreover, the fire extinguishing device of this embodiment is equipped with a ring nut 33 that is screwed onto the external threads of the mouthpieces 31 of the fire extinguisher containers 30A, 30B, and 30C.

In addition, although not shown, the mouthpiece 31 is provided with a sealing structure closed with a low-melting metal or adhesive that solidifies at room temperature and seals the spout. The extinguishing agent is melted and the spout is opened to eject the extinguishing agent inside the container. Regarding a fire extinguishing device in which a fire extinguishing agent is discharged from the opening when the fuse metal such as solder that blocks the opening receives the flame and melts down, for example, the above-mentioned Patent Document 3 and Japanese Patent Application Laid-Open No. 7-1997- No. 328140, Japanese Patent Application Laid-Open No. 2004-242993, etc., and can be configured in the same manner as those inventions.

A preferable melting temperature of the low-melting metal or adhesive is, for example, 80.degree. C. to 100.degree. This melting temperature was derived as a result of actual measurement during normal use. When the oil was heated on the stove and the oil temperature was 180°C, the current plate temperature was about 60°C. A sufficiently high temperature of 80°C to 100°C was taken as the melting temperature. Since the temperature observation data may change depending on the combination of the stove and the range hood, the sealing structure should be prepared in advance with several levels of preferred melting temperatures for the molten metal or adhesive, and installed. You may make it use properly according to the combination of the range hood and stove to use.
The fire extinguishing agent containers 30A, 30B, and 30C may be gas-based, powder-based, or water/foam-based. In the case of powder systems, there are sodium hydrogen carbonate and potassium hydrogen carbonate, and in the case of water and foam systems, there are strengthening liquids, lubricants, mechanical foams (surfactants), chemical foams, and the like.

On the other hand, at predetermined positions (three positions in the embodiment) of the rectifying plate 27, as shown in FIG. After fitting the projections 32 of the bases of the mouthpieces 31 of the fire extinguisher containers 30A, 30B, and 30C into the openings 27a, the ring nut 33 is screwed onto the external threads of the mouthpieces 31, and the ring nut 33 and the projections 31a are engaged. The extinguishing agent containers 30A, 30B, and 30C are fixed to the straightening plate 27 by sandwiching the straightening plate 27 between them.

Alternatively, the height of the convex portion 32 may be made larger than the thickness of the current plate 27, and a concave portion having a diameter larger than the diagonal line of the convex portion 32 may be formed on the joining side surface of the ring nut 33. Alternatively, a washer having an opening with a diameter larger than the diagonal line of the projection 32 may be inserted between the ring nut 33 and the projection 32 to absorb the difference between the thickness of the current plate 27 and the height of the projection 32. The extinguishing agent containers 30A, 30B, and 30C may be attached to the straightening plate 27 by securely sandwiching the straightening plate 27 therebetween.

As described above, the protrusions 32 are provided at the bases of the mouthpieces 31 of the fire extinguishing agent containers 30A, 30B, and 30C, and the straightening plate 27 is provided with the rectangular openings 27a into which the protrusions 32 can be fitted. When the nut 33 is screwed onto the male screw on the outer periphery of the mouthpiece 31, it is possible to prevent the container from rotating together, thereby improving the mounting workability. The shape of the extinguishing agent containers 30A, 30B, and 30C is not limited to a cylindrical shape, and may be a rectangular cylindrical shape with rounded corners or a shape that forms a sphere as a whole.

In the above embodiment, the openings 27a of the rectifying plate 27 are rectangular, but FIG. 4 shows a modification of the shape of the rectifying plate 27.
Among them, FIG. 4A shows a first modification of the opening shape, in which a rectangular shape having a width slightly larger than the minimum width of the convex portion 32 and elongated in the front-rear direction (up-down direction in the figure) on the straightening plate 27 is shown. An opening (slit) 27b is formed, and FIG. 4B shows a cross-shaped opening (slit) 27c having a width slightly larger than the minimum width of the projection 32 as a second modification of the opening shape. is formed.

With the above configuration, the attachment positions of the extinguishing agent containers 30A, 30B, and 30C relative to the current plate 27 can be adjusted in the front-rear direction or in the front-rear and left-right directions, and the position of the extinguishant ejection port can be accurately positioned at the center of the stove. can be matched. However, since the fire extinguishing agent spray spreads, it is usually not necessary to adjust it. Further, when the rectifying plate 27 is formed with the slits 27b, the holes remain open except for the engaging portions of the projections 32. Therefore, a long cover member with barbs made of heat-resistant resin or the like is used. It is good to prepare and close the hole by fitting it into the hole of the slit. The same applies to the slit 27c.

FIG. 5 shows modifications of the fire extinguishing agent containers 30A, 30B, and 30C.
Among these, FIG. 5A shows a first modification of the fire extinguisher container, in which a plurality of cooling fins 34A radially extending are provided on the outer peripheral surface of the fire extinguisher containers 30A, 30B, and 30C, and FIG. ) is a second modification of the fire extinguisher container, in which a plurality of parallel disc-shaped cooling fins 34B extending horizontally are provided on the outer peripheral surfaces of the extinguisher containers 30A, 30B, and 30C. In order to express the shape features of the modified examples in an easy-to-understand manner, the first modified example of the extinguishing agent container in (A) is a bottom view of the extinguishing agent containers 30A, 30B, and 30C, and the second extinguishing agent container in (B). A variant of is shown in a side view.
By providing the cooling fins 34A or 34B on the outer peripheral surfaces of the fire extinguisher containers 30A, 30B, and 30C in this way, even if the temperature of the containers rises due to heat transfer from the mouthpiece and the current plate 27, the cooling fins 34A and 34B Heat dissipation from 34B can cool the container to prevent the temperature of the container from becoming too high.
As explained above, the temperature of the straightening plate was about 60°C when the oil was heated on the stove and the oil temperature was 180°C. is also around 60°C. Since the fire extinguisher tank may absorb and store heat of 60°C or higher from the heat source through the mouthpiece closer to the stove than the rectifying plate, in that case, heat can be dissipated through the cooling fins provided in the fire extinguisher tank. , the temperature of the extinguishing agent tank can be prevented from becoming too high. Due to this action, the temperature of the low-melting metal of the die or the adhesive usually does not reach the melting temperature.

FIG. 6 shows a plan view of a main part as a modification of the fire extinguishing device of the above embodiment.
In this modification, the hot air flowing into the extinguishing agent containers 30A, 30B, and 30C attached to the current plate 27 from the gap between the current plate 27 and the range hood frame touches the extinguishing agent containers 30A, 30B, and 30C. In order to prevent the temperature of the fire extinguisher container from rising significantly, a shielding plate 35A is provided on the upstream side of the fire extinguisher container 30A, 30B, 30C to block and divert the air flow toward the fire extinguisher container. , 35B and 35C are provided.

Also, the shielding plates 35A to 35C are preferably semicircular or streamlined as shown in FIG. 6 in order to reduce air resistance. The shielding plates 35A to 35C may be directly attached to the rectifying plate 27 with screws or the like, but flanges having an opening in the center are provided at the ends of the shielding plates 35A to 35C to form an L-shaped vertical cross section. , and when the shielding plates 35A to 35C are attached to the straightening plate 27 with the ring nut 33, the flange portion is sandwiched between the extinguishing agent container and the straightening plate 27 to fix the shielding plates 35A to 35C. good. The height of the shielding plates 35A-35C is the same as or slightly larger than the height of the extinguishing agent container.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the embodiment. For example, in the above embodiment, the convex portion 32 of the mouthpiece base portion of the fire extinguishing agent containers 30A, 30B, and 30C has a rectangular shape when viewed from above, but is not limited to a rectangular shape, and may have a hexagonal or other polygonal shape. Alternatively, it may have a shape such as a star shape.
Further, in the above-described embodiment, the application to the range hood in which three stoves are installed on the range table has been described, but the number of stoves and fire extinguisher containers is not limited to three, and may be any number.

Furthermore, if you want to increase the amount of extinguishing agent, or if the space behind the straightening plate 27 of the range hood 20 is narrow, a bulging portion that swells toward the stove side is formed at the position where the extinguishing agent is installed on the straightening plate 27, A wide space for storing the extinguishing agent container may be secured on the back side of the rectifying plate.
In the above embodiment, the extinguishing agent containers 30A, 30B, and 30C are connected to the current plate 27 by screwing the ring nuts 33 onto the mouthpieces 31 of the extinguishing agent containers 30A, 30B, and 30C. is provided, and a retaining ring such as a clip ring is detachably engaged with the groove so that the container can be connected to the rectifying plate 27 .

10 Cooking table 11A, 11B, 11C Gas stove 17a to 17g Pipe 20 for water supply Range hood 21 Housing 21A Hood part 21B Storage part 22 Exhaust duct 23 Fan 24 Rotation motor 25 Operation part 26 Lighting lamp 27 Straightening plate 27a Opening 27b aperture (slit)
28 Filters 29A, 29B Suspension fittings 30A, 30B, 30C Extinguishing agent container 31 Base 32 Convex portion 33 Ring nuts 34A, 34B Cooling fins 35A, 35B, 35C Shield plate

Claims (5)

A range hood fire extinguishing device comprising one or more fire extinguishing agent containers filled with fire extinguishing agent attached to said straightening plate of a range hood equipped with a fan and a straightening plate, with the ejection port of the extinguishing agent facing downward. ,
The fire extinguisher container includes a mouthpiece having the spout, and a protrusion having a non-circular shape in a top view formed at the base of the mouthpiece so as to surround the mouthpiece,
An opening having a shape corresponding to the convex portion and into which the base can be inserted is formed at a predetermined position of the rectifying plate,
The fire extinguisher container is arranged on the surface of the rectifying plate that is inside the cooker hood, the convex portion is fitted into the opening, and the part of the mouthpiece protruding from the rectifying plate is locked by a locking means. a fire extinguishing device for a range hood, wherein the fire extinguishing agent container is fixed to the current plate. 2. A range hood fire extinguisher according to claim 1, wherein a male screw is formed on the outer circumference of said base, and said locking means is a nut that can be screwed onto said male screw. The range hood fire extinguisher according to claim 1 or 2, wherein the opening is formed as an elongated hole having the same width as the minimum width of the projection. 2. A shielding plate is provided upstream of the airflow above the rectifying plate generated by the rotation of the fan in the fire extinguisher container to block and divert the air flow toward the fire extinguisher container. 4. The range hood fire extinguisher according to any one of 1 to 3. The range hood fire extinguishing device according to any one of claims 1 to 4, wherein the fire extinguishing agent container has a heat dissipation structure.

Images