Range hood fire extinguisher

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]

[0001] The present invention relates to a fire extinguishing device that is installed in a kitchen range hood and sprays a fire extinguishing agent in response to a fire caused by a stove. [Background technology]

[0002] Conventionally, there is known a fire extinguishing device that sprays a fire extinguishing agent when a fire occurs in a range equipped with a stove. In addition, inventions relating to fire extinguishing devices for ranges are described in, for example, Patent Documents 1, 2, and 3. Of these, Patent Document 1 describes an invention in which a fire extinguisher (extinguishing agent container) containing an extinguishing agent, an extinguishing agent ejection section, and a pipeline connecting the two are provided within a range hood, and a bellows-shaped fire-resistant expansion body is arranged in a contracted and locked state around the outer periphery of the range hood, and an extinguishing agent ejection means is provided for releasing the locked state of the fire-resistant expansion body and expanding it as the extinguishing agent is ejected.

[0003] Furthermore, Patent Document 2 describes an invention in which a fire extinguishant container, an extinguishant nozzle, and a connecting pipe are provided inside a range hood, and a slit-shaped diffusion nozzle is used as the nozzle so that the fire extinguishant is sprayed evenly onto the top of a gas stove. Patent Document 3 describes an invention relating to an automatic fire extinguishing device that includes a storage container that stores liquid extinguishing agent without pressure and has a discharge outlet for dripping the extinguishing agent, an installation means for installing the storage container within a structure, and an operating means that switches the discharge outlet to a state where the extinguishing agent drips from above the fire source when the temperature of the fire source increases by a predetermined amount. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-246482 [Patent Document 2] JP 2018-146492 A [Patent Document 3] JP 2006-325952 A Summary of the Invention [Problem to be solved by the invention]

[0005] The fire extinguishing devices described in Patent Documents 1 and 2 both have a complex structure, such as a pipe connecting the extinguishing agent container and the nozzle, a fire-resistant expansion body on the outer periphery of the range hood, and a communication unit in the control unit. Therefore, when installing a fire extinguisher inside a range hood, or when replacing or maintaining the fire extinguisher container, or when restoring the fire after activation, the work must be done by someone with specialized knowledge, and the work is extensive. In addition, there is an issue that the range hood becomes large in size because the placement of the fire extinguisher container is not well thought out.

[0006] In addition, the fire extinguishing device described in Patent Document 3 has a complex configuration that includes an installation means for installing a storage container, which includes a mounting base that can be fixed to a structure located above the stove, a guide supported in a cantilevered state by the mounting base, and a movable body that is supported so that it can slide along the guide and holds the storage container, resulting in problems such as complicated maintenance work and a large operating device.

[0007] The present invention has been made against the background described above, and its object is to provide a fire extinguishing device for a range hood that allows even a person without specialized knowledge to easily install or replace a fire extinguishing agent container on a range hood, perform maintenance, restoration, etc. Another object of the present invention is to provide a fire extinguisher for a range hood, which makes it possible to place a fire extinguishant container inside the range hood while avoiding an increase in the size of the range hood. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention relates to A fire extinguishing device for a range hood, comprising a fan and a baffle plate, and one or more extinguishing agent containers filled with an extinguishing agent are attached to the baffle plate of the range hood with the extinguishing agent nozzle facing downward, The extinguishant container includes a nozzle having the nozzle, and a protrusion having a shape that is not circular in top view and formed at a base of the nozzle so as to surround the nozzle, an opening having a shape corresponding to the protrusion and into which the base can be inserted is formed at a predetermined position of the straightening plate; The extinguishant container is placed on the surface of the baffle plate that faces the inside of the range hood, and the convex portion is fitted into the opening, and the portion of the nozzle that protrudes beyond the baffle plate is engaged by a locking means, thereby fixing the extinguishant container to the baffle plate. Here, typical examples of "non-circular shapes" are quadrangles and other polygons.

[0009] According to the above-mentioned configuration, it is possible to realize a fire extinguishing device that enables even a person without specialized knowledge to easily install and replace the fire extinguishant container on the range hood, perform maintenance, restoration, etc. Also, since the opening is formed in advance at the predetermined position of the baffle plate, the fire extinguishant container can be easily and accurately installed at the predetermined position of the baffle plate. Furthermore, since there is no need for a pipe connecting the extinguishant container to the nozzle, the extinguishant container can be placed inside the range hood while avoiding an increase in the size of the range hood.

[0010] Preferably, a male thread is formed on the outer periphery of the base, and the locking means is a nut that can be screwed onto the male thread. According to this configuration, the extinguishant container can be easily connected and attached to the baffle plate of the range hood using common tools such as a spanner or wrench.

[0011] Furthermore, it is preferable that the aperture is formed as an elongated hole having the same width as the minimum width of the protrusion. With this configuration, the position of the extinguishing agent container's nozzle can be adjusted by moving the convex portion along the opening and then locking it with the locking means, thereby making it possible to optimally adjust the ejection position of the extinguishing agent being ejected.

[0012] It is also preferable that a shielding plate be provided on the upstream side of the airflow above the airflow straightening plate generated by the rotation of the fan, to block and divert the air flow toward the extinguishant container. With this configuration, it is possible to prevent the temperature of the extinguishant container from increasing excessively due to the hot air current from the stove directly hitting the extinguishant container.

[0013] Also, preferably, the extinguishant container is configured to have a heat dissipation structure. With the above-described configuration, even if the temperature of the extinguishant container rises due to heat transfer from the baffle plate, the heat is dissipated from the outer periphery of the container, thereby preventing the temperature of the extinguishant container from rising excessively. Effect of the Invention

[0014] According to the range hood fire extinguisher of the present invention, even a person without specialized knowledge can easily install, replace, maintain, and restore a fire extinguishant container on a range hood. In addition, there is an effect that a fire extinguishant container can be arranged inside a range hood while avoiding an increase in the size of the range hood. [Brief description of the drawings]

[0015] [Figure 1] 1 is a front view showing one embodiment of a fire extinguishing device for a range hood according to the present invention. [Diagram 2] FIG. 2 is a side view showing the configuration of the fire extinguisher of the embodiment shown in FIG. [Diagram 3] FIG. 2A is a side view showing details of a fire extinguishant container constituting the fire extinguisher of the embodiment, and FIG. 2B is a bottom view showing details of a baffle plate constituting the range hood. [Figure 4]FIG. 13(A) is a bottom view showing a first modified example of the opening shape of the straightening vane, and (B) is a bottom view showing a second modified example of the opening shape of the straightening vane. [Diagram 5] FIG. 1(A) is a bottom view showing a first modified example of the extinguishant container, and (B) is a side view showing a second modified example of the extinguishant container. [Figure 6] FIG. 11 is a plan view of a main portion showing a modified example of the fire extinguisher of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 show an embodiment of a range stand and a range hood to which the range hood fire extinguishing device of the present invention is applied. Of Figures 1 and 2, Figure 1 is a front view and Figure 2 is a side view. The fire extinguishing device of this embodiment is provided in a range hood 20 located above a range stand 10 installed in a kitchen or the like.

[0017] As shown in Figs. 1 and 2, range stand 10 has three gas burners 11A, 11B, and 11C provided at the top, and a range hood 20, which is slightly larger than gas burners 11A, 11B, and 11C, is provided above range stand 10 so as to cover the entire range stand 10. The range hood 20 includes a housing 21 made of a stainless steel plate or the like and consisting of a hood section 21A and an equipment storage section 21B that are rectangular in top view, with an exhaust duct 22 provided at the top of the housing 21 and an exhaust fan 23 and a rotation motor 24 disposed inside the equipment storage section 21B. An operation section 25 having switch push buttons for turning ventilation and lighting on and off is provided on the front frame of the hood section 21A, and an illumination lamp 26 (see FIG. 2) is disposed inside the front frame behind the operation section 25. The lower part of the illumination lamp 26 is covered with a semi-transparent cover.

[0018] Furthermore, the entire bottom surface of the hood section 21A is opened, and a flat rectifying plate 27 that is slightly smaller than the opening of the hood section 21A is disposed at the bottom of the housing 21 so as to cover the opening. The rectifying plate 27 is formed of a non-flammable material such as a metal plate having a thickness of about 1 mm, and is configured so that when the fan 23 rotates, air is sucked in through a gap of several centimeters formed between the outer edge of the rectifying plate 27 and the frame of the hood section 21A, and is discharged through the exhaust duct 22 from the rear area of ​​the rectifying plate 27 (the inner surface of the range hood). In addition, a filter 28 is provided between the rectifying plate 27 and the fan 23 inside the range hood. The exhaust duct 22 can be attached by changing its direction by 90 degrees in the horizontal plane.

[0019] The straightening plate 27 is suspended horizontally at a predetermined interval from the upper wall of the hood portion 21A by hanging fittings 29A, 29B (see FIG. 2) provided on the underside of the upper wall of the hood portion 21A, with four locking portions provided at the front and rear, and is configured to be removable. The position of the straightening plate 27 is at approximately the same height as the lower end of the hood portion 21A. Although not shown, the straightening plate 27 is configured to be less likely to deform by bending the peripheral portion upward to form a rib with a height of about 10 mm that protrudes upward along the peripheral portion.

[0020] Of the hanging brackets 29A, 29B, the rear hanging bracket 29B is a hook type, and the front hanging bracket 29A is equipped with a stopper button with a built-in spring. When the stopper button is pressed with a finger, it is unlocked and the straightening plate 27 can be moved up and down. When the finger is released from the stopper button, the flange on the side of the straightening plate 27 is clamped by the stopper and locked, preventing the straightening plate 27 from moving up and down and fixing it in place.

[0021] In this embodiment, extinguishant containers 30A, 30B, and 30C filled with extinguishant are attached with their nozzles facing downward to the positions of the straightening plate 27 directly above the gas stoves 11A, 11B, and 11C. The extinguishant containers 30A, 30B, and 30C are, for example, cylindrical metal containers with a metal nozzle on one disc portion thereof, and the straightening plate 27 has an opening at a predetermined position (directly above the stove) through which the nozzle of the extinguishant container 30A, 30B, and 30C is inserted.

[0022] FIG. 3(A) shows a side view showing details of the extinguishant containers as specific examples of the extinguishant containers 30A, 30B, and 30C that constitute the fire extinguishing system of the embodiment, and FIG. 3(B) shows a bottom view showing details of the baffle plate 27 that constitutes the range hood. As shown in FIG. 3(A), extinguishant containers 30A, 30B, 30C have a nozzle 31, which serves as an extinguishant outlet, in the center of the bottom wall. A male thread is formed on the outer periphery of this nozzle 31, and a protrusion 32 (see FIG. 5) for preventing rotation is formed at the base (base) of nozzle 31, which has approximately the same height as the thickness of baffle 27 and is rectangular in top view. The fire extinguisher of this embodiment also includes a ring nut 33 that is screwed onto the male thread on the outer periphery of the nozzle 31 of each of the extinguishant containers 30A, 30B, and 30C.

[0023] In addition, although not shown, a sealing structure blocked with low-melting metal or adhesive that solidifies at room temperature to seal the nozzle is provided inside the nozzle 31, and it is configured so that when the temperature of the nozzle rises, the low-melting metal or adhesive melts and the nozzle is opened to spray the extinguishing agent inside the container. Fire extinguishing devices in which a fuse metal such as solder that has been blocking the opening melts and falls due to exposure to flames, thereby releasing the extinguishing agent from the opening, are described in, for example, the above-mentioned Patent Document 3, Japanese Patent Laid-Open No. 7-328140, Japanese Patent Laid-Open No. 2004-242993, etc., and can be configured in a similar manner to those inventions.

[0024] The preferred melting temperature of the low melting metal or adhesive is, for example, 80°C to 100°C. This melting temperature was derived as a result of actual measurements during normal use, and since the temperature of the baffle plate was about 60°C when oil was heated in the stove and the oil temperature was 180°C, the melting temperature was set to 80°C to 100°C, which is sufficiently higher than the actual measured value during normal use. Since the temperature observation data may change depending on the combination of the stove and the range hood, the sealing structure may be prepared in advance with several stages of preferred melting temperatures for the molten metal or adhesive, and used according to the combination of the range hood and stove to be installed. Fire extinguishant containers 30A, 30B, 30C may be any of gas, powder, or water / foam types, and the extinguishing agent filled inside the container may be, for example, carbon dioxide or Halon 1301 for gas types, sodium bicarbonate or potassium bicarbonate for powder types, or a strengthening liquid, lubricant, mechanical foam (surfactant), chemical foam, etc. for water / foam types.

[0025] On the other hand, at predetermined positions of the straightening plate 27 (three positions in this embodiment), as shown in Figure 3 (B), rectangular openings 27a are formed into which the above-mentioned protrusions 32 can fit, and after the protrusions 32 at the base of the nozzles 31 of the extinguishant containers 30A, 30B, 30C are fitted into these openings 27a, the ring nut 33 is screwed onto the male threads on the outer periphery of the nozzle 31, and the straightening plate 27 is sandwiched between the ring nut 33 and the protrusions 31a, whereby the extinguishant containers 30A, 30B, 30C are fixed to the straightening plate 27.

[0026] In addition, the height of the convex portion 32 may be made greater than the thickness of the baffle plate 27, and a concave portion having a diameter greater than the diagonal of the convex portion 32 may be formed on the joining side surface of the ring nut 33, or a washer having an opening with a diameter greater than the diagonal of the convex portion 32 may be inserted between the ring nut 33 and the convex portion 32 to absorb the difference in thickness of the baffle plate 27 and the height of the convex portion 32, and the baffle plate 27 may be securely sandwiched so that the extinguishant containers 30A, 30B, 30C are attached to the baffle plate 27.

[0027] As described above, by providing the protrusion 32 at the base of the nozzle 31 of the extinguishant containers 30A, 30B, 30C and providing the straightening plate 27 with the rectangular opening 27a into which the protrusion 32 can fit, it is possible to prevent the container from rotating when the ring nut 33 is screwed onto the male thread on the outer periphery of the nozzle 31, thereby improving the ease of installation. The shape of the extinguishant containers 30A, 30B, 30C is not limited to a cylindrical shape, and may be a rectangular tube with rounded corners or a spherical shape.

[0028] In the above embodiment, the apertures 27a of the rectifying plate 27 are rectangular, but FIG. 4 shows a modified example of the aperture shape of the rectifying plate 27. Of these, Figure 4(A) shows a first modified example of the opening shape, in which a rectangular opening (slit) 27b having a width slightly larger than the minimum width of the convex portion 32 is formed in the straightening plate 27 in the front-to-back direction (up-down direction in the figure), and Figure 4(B) shows a second modified example of the opening shape, in which a cross-shaped opening (slit) 27c having a width slightly larger than the minimum width of the convex portion 32 is formed.

[0029] With the above configuration, the mounting positions of the extinguishant containers 30A, 30B, and 30C relative to the baffle 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 nozzle can be accurately aligned with the center of the stove. However, since the extinguishant spray spreads, adjustment is usually not necessary, and an adjustment mechanism is preferably provided especially when the distance between the stove and the range hood is large. Also, when the baffle plate 27 is formed with the slit 27b, the hole remains open except for the engagement part of the protrusion 32, so it is preferable to prepare a long cover member with a barb made of a material such as heat-resistant resin and fit it into the slit hole to close the hole. The same applies to the slit 27c.

[0030] FIG. 5 shows modified examples of the extinguishant containers 30A, 30B, and 30C. Of these, Fig. 5(A) shows a first modified example of the extinguishant container in which a plurality of cooling fins 34A spreading radially are provided on the outer peripheral surface of the extinguishant containers 30A, 30B, and 30C, and Fig. 5(B) shows a second modified example of the extinguishant container in which a plurality of parallel disk-shaped cooling fins 34B spreading horizontally are provided on the outer peripheral surface of the extinguishant containers 30A, 30B, and 30C. In order to clearly show the shape characteristics of the modified examples, the first modified example of the extinguishant container in (A) is shown in a bottom view of the extinguishant containers 30A, 30B, and 30C, and the second modified example of the extinguishant container in (B) is shown in a side view. In this way, by providing cooling fins 34A or 34B on the outer peripheral surface of the extinguishant container 30A, 30B, 30C, even if the temperature of the container rises due to heat transfer from the nozzle and the baffle plate 27, the container can be cooled by heat dissipation from the cooling fins 34A, 34B, so that the temperature of the container does not become too high. As explained above, when oil is heated on a stove under normal circumstances and the oil temperature is 180°C, the temperature of the baffle is about 60°C, so the temperature of the airflow passing around the extinguishant tank is also about 60°C. The extinguishant tank can absorb and store heat of 60°C or more from the heat source via the nozzle, which is closer to the stove than the baffle, as radiant heat, and in such cases the heat can be dissipated via cooling fins on the extinguishant tank to prevent the temperature of the extinguishant tank from becoming too high. Due to this effect, the temperature of the low-melting metal or adhesive in the nozzle does not normally reach its melting point.

[0031] FIG. 6 shows a plan view of the essential parts of a modified example of the fire extinguisher of the above embodiment. This modified example is designed to prevent hot air flowing in through the gap between the baffle plate 27 and the range hood frame from coming into contact with the extinguisher containers 30A, 30B, 30C attached to the baffle plate 27 and causing a significant increase in the temperature of the extinguisher containers. Shielding plates 35A, 35B, 35C are provided on the upstream side of the airflow of each extinguisher container 30A, 30B, 30C to block and divert the flow of air heading toward the extinguisher container.

[0032] In order to reduce air resistance, the shielding plates 35A to 35C are preferably semicircular or streamlined as shown in Fig. 6. The shielding plates 35A to 35C may be directly attached to the straightening plate 27 with screws or the like, but may also be configured such that a flange portion having an opening in the center is provided at the end 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 extinguishant container and the straightening plate 27 to fix them. The height of the shielding plates 35A to 35C is set to be the same as or slightly larger than the height of the extinguishant container.

[0033] Although the invention made by the present inventor has been specifically described based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the shape of the protrusion 32 of the nozzle base of the extinguishant container 30A, 30B, 30C is rectangular when viewed from above, but it is not limited to a rectangular shape and may be a hexagon, other polygonal shape, star shape, or the like. In addition, in the above embodiment, the present invention has been described as being applied to a range hood having three burners installed on the range stand, but the number of burners and extinguisher containers is not limited to three and may be any number.

[0034] Furthermore, if it is desired to increase the amount of extinguishing agent or if the space behind the baffle plate 27 of the range hood 20 is narrow, a bulge that bulges out toward the stove at the position where the extinguishing agent is installed on the baffle plate 27 may be formed, thereby ensuring a large space behind the baffle plate for storing the extinguishing agent container. In addition, in the above embodiment, the containers are connected to the baffle plate 27 by screwing the ring nut 33 onto the nozzle 31 of the extinguishant containers 30A, 30B, 30C, but the containers may be configured to be connected to the baffle plate 27 by providing a ring-shaped groove on the outer periphery of the nozzle 31 and removably engaging a retaining ring such as a clip ring with this groove to prevent it from coming off. [Explanation of symbols]

[0035] 10 Range stand 11A, 11B, 11C Gas stove 17a~17g Water supply pipes 20 Range Hood 21 Case 21A Hood section 21B Storage area 22 Exhaust duct 23 Fan 24 Rotation motor 25 Control section 26 Lighting lamps 27 Rectifier plate 27a Open hole 27b Slit 28 Filters 29A, 29B Hanging hardware 30A, 30B, 30C Fire extinguishing agent container 31 Cap 32 Convex 33 Ring Nut 34A, 34B Cooling fins 35A,35B,35C shielding plate

Claims

1. A fire extinguishing device for a range hood, comprising: a range hood having a fan and a baffle; one or more extinguishing agent containers filled with an extinguishing agent are attached to the baffle with the extinguishing agent nozzle facing downward; The extinguishant container includes a nozzle having the nozzle, and a protrusion having a shape that is not circular in top view and formed at a base of the nozzle so as to surround the nozzle, an opening having a shape corresponding to the protrusion and into which the base can be inserted is formed at a predetermined position of the straightening plate; The extinguisher container is placed on the surface of the baffle that faces the inside of the range hood, and the convex portion is fitted into the opening, and the portion of the nozzle that protrudes beyond the baffle is engaged with a locking means, thereby fixing the extinguisher container to the baffle.

2. 2. The fire extinguishing device for a range hood according to claim 1, wherein a male thread is formed on an outer periphery of said base, and said locking means is a nut that can be screwed onto said male thread.

3. 3. The fire extinguishing device for a range hood according to claim 1, wherein the opening is formed as an elongated hole having the same width as the minimum width of the protrusion.

4. A fire extinguishing device for a range hood as described in any one of claims 1 to 3, characterized in that a shielding plate that blocks and redirects the flow of air toward the extinguishant container is provided on the upstream side of the air flow above the baffle plate generated by the rotation of the fan of the extinguishant container.

5. The fire extinguisher for a range hood according to any one of claims 1 to 4, characterized in that the extinguishant container has a heat dissipation structure.

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