Electrical equipment

Abstract

To provide an electrical apparatus that can prevent the occurrence and spread of a fire and has a superior initial fire extinguishing capability.SOLUTION: An electrical apparatus comprises an electrical device and a housing for accommodating the electrical device. At least a portion of the inner wall of the housing is provided with a fire extinguisher to face the electrical device. The fire extinguisher comprises a fire extinguishing material composed of a molded composition comprising a fire extinguishing agent and a binder.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to electrical equipment. [Background technology]

[0002] Electrical equipment such as distribution boards, panelboards, and control panels may be at risk of fire due to short circuits, sparks, insulation deterioration, and electrical leakage.

[0003] To address the problem of ignition and fire, Patent Document 1 proposes the use of a fire extinguishing liquid and a fire extinguisher. Patent Document 2 proposes an aerosol fire extinguishing device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-276440 [Patent Document 2] Japanese Patent Application Publication No. 2017-080023 Summary of the Invention [Problem to be solved by the invention]

[0005] While all of the prior art proposes methods for dealing with a fire after a certain amount of time has passed, from the perspective of minimizing damage caused by a fire, it is desirable to carry out some kind of fire-fighting operation (initial fire extinguishing) on ​​electrical equipment immediately after the fire has started.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide electrical equipment that is excellent in early fire extinguishing properties and can prevent the occurrence and spread of fire. [Means for solving the problem]

[0007] One aspect of the present invention provides electrical equipment including an electrical device and a housing for accommodating the electrical device, a fire extinguishing body provided on at least a portion of the inner wall of the housing so as to face the electrical device, the fire extinguishing body including a fire extinguishing material formed by molding a composition containing a fire extinguishing agent and a binder. With such electrical equipment, the fire extinguishing body can perform fire extinguishing work immediately after a fire breaks out, thereby preventing the occurrence and spread of the fire.

[0008] In one embodiment, the distance between the electrical equipment and the fire extinguishing body may be 150 mm or less.

[0009] In one embodiment, the fire extinguishing agent may include at least one salt selected from the group consisting of an organic salt and an inorganic salt, and the binder may include at least one resin selected from the group consisting of a polyvinyl acetal resin and a polyvinyl alcohol resin.

[0010] In one embodiment, the fire-extinguishing material may contain 70 to 97 mass % of salt based on the total amount of salt and resin.

[0011] In one embodiment, the salt may be a potassium salt.

[0012] In one embodiment, the fire extinguishing body may include an adhesive layer, and the fire extinguishing body may be provided on the inner wall via the adhesive layer. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide electrical equipment that is excellent in early fire extinguishing properties and can prevent the occurrence and spread of fire.

[0014] The advantages of the present invention are briefly summarized below. - Minimizes damage caused by the spread of fire. After a person confirms a fire, there is no need to carry a fire extinguisher to the area where the fire is to be extinguished and carry out firefighting activities. -Compared to automatic fire extinguishing devices and other equipment, it can be installed more easily, so there are fewer restrictions on where it can be installed and it can be applied wherever necessary. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic external view of a fire extinguisher according to one embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view of a fire extinguishing element according to one embodiment. [Figure 3] FIG. 3 is a schematic external view of the electrical equipment according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments.

[0017] <Fire extinguishing body> 1 is a schematic external view of a fire extinguisher according to one embodiment. The fire extinguisher 10 includes a packaging bag 11 made of a base material and a fire extinguishing material sealed in the packaging bag. The packaging bag 11 has a sealed portion 11a at its periphery, and the base materials are joined together at the sealed portion 11a.

[0018] When the fire extinguisher is viewed from above in the vertical direction, the width of the sealing portion 11a is not particularly limited, but may be, for example, 2 to 40 mm from the viewpoint of the stability of the properties of the fire extinguishing agent.

[0019] The thickness of the center of the fire extinguishing body is not necessarily limited because it varies depending on the layer structure and the amount of fire extinguishing material enclosed, but can be, for example, 2 to 20 mm from the viewpoint of being able to make it thin so that installation space is not a concern while maintaining fire extinguishing performance. Also, the area of ​​the main surface of the fire extinguishing body (the surface when viewed from above in the vertical direction) can be, for example, 9 to 620 cm from the viewpoint of fire extinguishing performance and ease of handling. 2 It can be said that:

[0020] FIG. 2 is a schematic cross-sectional view of a fire extinguisher according to one embodiment. The fire extinguisher 20 includes a packaging bag 21 formed from a base material, a fire extinguishing material 22 sealed within the packaging bag, and an adhesive layer 24 (or bonding layer) and a release film 25 on one side of the packaging bag. The base material includes a first resin layer 211 having thermal fusibility as an inner layer and a second resin layer (e.g., a water vapor barrier layer) 212 as an outer layer. The first resin layer 211 and the second resin layer 212 are laminated via an adhesive layer 23. The fire extinguisher 22 is formed on a support layer 26. In this embodiment, the adhesive layer 24 is provided on one side of the packaging bag, allowing the fire extinguisher to be installed on the inner wall of a housing for electrical equipment according to the arrangement of the electrical equipment. The release film 25, provided to cover the adhesive layer 24, is peeled off when the fire extinguisher is attached to a desired location and may be made of resin or paper.

[0021] The fire extinguisher may further include a design layer. The design layer can be formed by printing or lettering. Specific examples of designs include solid white or gray patterns, such as wood grain or tile patterns, that are designed to complement residential spaces, as well as pictures, patterns, designs, and character patterns. Providing a design layer can enhance the design, allow the fire extinguisher to blend in with the surrounding environment, and increase the strength of the fire extinguisher. For example, in the embodiment of FIG. 2, the design layer can be provided on the side of the packaging bag opposite the adhesive layer (the side to which the fire extinguisher is attached). If the layer contained in the substrate is transparent, the design layer may be provided within the substrate. For example, in the embodiment of FIG. 2, the design layer may be provided inside the second resin layer 212. The design layer may have a single-layer structure or a multi-layer structure.

[0022] (base material) The substrate includes a resin layer. Examples of materials for the resin layer include polyolefin (PE, PP, COP, etc.), polyester (PET, etc.), fluororesin (PTFE, ETFE, EFEP, PFA, FEP, PCTFE, etc.), vinyl resin (PVC, PVA, etc.), acrylic resin, epoxy resin, polyamide, polyimide, etc. The substrate may be composed of one resin layer made of these materials, or multiple resin layers. The multiple resin layers may be made of different materials. When the substrate is composed of multiple layers, the layers may be bonded together with an adhesive (adhesive layer). Examples of adhesives include acrylic adhesives, epoxy adhesives, silicone adhesives, polyolefin adhesives, urethane adhesives, polyvinyl ether adhesives, or synthetic adhesives thereof. To facilitate melting due to the heat of a fire and to facilitate the application of heat to the fire extinguishing agent, a resin layer with a moderate melting point may be provided on the outermost layer of the substrate (the side facing the electrical equipment). Such layers include polyolefin layers, and for example, layers of PE (melting point: 137°C) or PP (melting point: 163°C) have lower melting points than layers of PET (melting point: 265°C). In switchboards and the like, fires spread gradually after ignition (not explosive fires), so such polyolefin layers are suitable for use.

[0023] The resin layer may have heat-melting properties (thermal adhesiveness). A resin layer having heat-melting properties can be referred to as a heat-melting layer. The heat-melting layer can be provided on the innermost layer side of the substrate (the side facing the fire extinguishing material). When the substrate has a heat-melting layer, the sealed portion around the packaging bag edge can be referred to as the heat-sealed portion. Examples of heat-melting resins include polyolefin-based resins. That is, the resin layer may contain a polyolefin-based resin. Examples of polyolefin-based resins include polyolefin-based resins such as low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), medium-density polyethylene resin (MDPE), and unstretched polypropylene resin (CPP); polyethylene-based resins such as ethylene-vinyl acetate copolymer and ethylene-α-olefin copolymer; and polypropylene-based resins such as propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer. Among these, the polyolefin resin may include low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), or unoriented polypropylene resin (CPP) from the viewpoint of excellent heat sealing properties, low water vapor permeability, and easy suppression of deterioration of the fire extinguishing agent. These resins are transparent, facilitating visual inspection of the fire extinguishing agent. Therefore, it is easy to check when the fire extinguishing element needs to be replaced.

[0024] When no heat-melting layer is provided, an adhesive can be used to bond the substrates together. Examples of adhesives include acrylic adhesives, epoxy adhesives, silicone adhesives, polyolefin adhesives, urethane adhesives, polyvinyl ether adhesives, and synthetic adhesives thereof. Among these, epoxy-urethane synthetic adhesives are preferred from the viewpoint of achieving both low cost and good adhesion to the substrate at high temperatures and humidity of 85°C-85%RH.

[0025] When the periphery of the base material is joined using an adhesive, the sealed portion of the periphery of the packaging bag can be called the adhesive portion.

[0026] The substrate may include a water vapor barrier layer. The water vapor barrier layer may be provided on the outermost layer side of the substrate, or may be provided as an intermediate layer of the substrate. When the substrate is provided with a water vapor barrier layer, it becomes easier to maintain water vapor barrier properties to the extent that the properties of the fire extinguishing agent do not change significantly, regardless of the installation location or usage environment of the fire extinguishing element. The water vapor permeability of the water vapor barrier layer (under 40°C / 90% RH conditions in accordance with JIS K 7129) is not particularly limited as it can be designed according to the type of fire extinguishing agent, but is preferably 10 g / m 2 / day or less, and 2 / day or less. From the viewpoint of adjusting the water vapor permeability, examples of the water vapor barrier layer include a polyester resin layer (e.g., a PET layer) provided with a metal oxide vapor-deposited layer such as an alumina vapor-deposited layer or a silica vapor-deposited layer, and a metal foil such as aluminum foil. When the water vapor barrier layer includes a metal oxide vapor-deposited layer, the metal oxide vapor-deposited layer may face the fire extinguishing agent side.

[0027] The thickness of the substrate can be appropriately selected depending on the usage environment of the fire extinguisher, the allowable space, etc. For example, a thick substrate makes it easier to suppress water vapor permeation, easily obtain strength and rigidity, easily obtain a highly flat form, and facilitate handling. Furthermore, a thin substrate allows the fire extinguisher to be installed in a narrow space. The thickness of the substrate can be, for example, 4.5 to 1000 μm, or may be 12 to 100 μm, or may be 12 to 50 μm. The thicknesses of the resin layer and the water vapor barrier layer can be appropriately adjusted depending on the thickness of the substrate. The thickness of the resin layer (the total thickness when the substrate includes multiple resin layers) can be, for example, 25 to 150 μm, or may be 30 to 100 μm. The thickness of the water vapor barrier layer can be, for example, 4.5 to 25 μm, or may be 7 to 12 μm.

[0028] <Fire extinguishing material> The fire extinguishing material is formed by molding a composition (fire extinguishing material forming composition) containing a fire extinguishing agent and a binder. By molding the fire extinguishing agent using a binder, the properties of the fire extinguishing agent are easily maintained, and the frequency of replacing the fire extinguishing body can be reduced. The fire extinguishing material forming composition may further contain a liquid medium in addition to the above-mentioned resin and binder.

[0029] (Fire extinguishing agent) The fire extinguishing agent can extinguish a fire by generating an aerosol upon combustion. The fire extinguishing agent can contain at least one salt of an organic salt and an inorganic salt. The organic salt and the inorganic salt may be a hygroscopic salt.

[0030] Examples of organic salts that function as fire extinguishing agents include potassium salts, sodium salts, and ammonium salts. Potassium salts can be used as the organic salt. Examples of organic potassium salts include potassium carboxylates such as potassium acetate, potassium citrate (tripotassium citrate), potassium tartrate, potassium lactate, potassium oxalate, and potassium maleate. Of these, potassium acetate or potassium citrate can be used from the viewpoint of their usefulness in preventing the negative catalytic effect of combustion.

[0031] Examples of inorganic salts that function as fire extinguishing agents include potassium salts and sodium salts. Potassium salts can be used as the inorganic salt. Examples of inorganic potassium salts include potassium chlorate, potassium tetraborate, potassium carbonate, potassium bicarbonate, potassium dihydrogen phosphate, and dipotassium hydrogen phosphate. Of these, potassium bicarbonate can be used from the viewpoint of its usefulness in preventing the negative catalytic effect of combustion.

[0032] The organic salts and inorganic salts may be used alone or in combination of two or more kinds.

[0033] The organic salt and inorganic salt may be granular. The average particle diameter D50 of the organic salt and inorganic salt may be 1 to 100 μm or 3 to 40 μm. When the average particle diameter D50 is equal to or greater than the lower limit, the salt is easily dispersed in the system. When the average particle diameter D50 is equal to or less than the upper limit, the stability of the coating liquid is improved, and the smoothness of the coated surface tends to be improved. The average particle diameter D50 can be calculated by wet measurement using a laser diffraction particle size distribution analyzer.

[0034] The amount of salt (organic salt and inorganic salt) may be 70 to 97% by mass, or 85 to 92% by mass or less, based on the total amount of salt and resin (polyvinyl acetal resin and polyvinyl alcohol resin described below). When the amount of salt is equal to or less than the upper limit, a uniform fire-extinguishing material is easily formed, and when the amount of salt is equal to or greater than the lower limit, moisture absorption by the salt is easily suppressed and sufficient fire-extinguishing properties are easily maintained. The total amount of salt and resin may refer to the total amount of fire-extinguishing agent and binder, depending on the components contained in each.

[0035] From the viewpoint of exhibiting a fire-extinguishing function, the content of the organic salt and inorganic salt contained in the fire extinguishing agent can be 60 mass% or more, based on the total amount of the fire extinguishing agent, or may be 90 mass% or more, or may be 100 mass%.

[0036] The fire extinguishing agent may contain other components in addition to the salts described above. Examples of other components include colorants, oxidizers, antioxidants, flame retardants, inorganic fillers, fluidity imparting agents, moisture-proofing agents, dispersants, and UV absorbers. These other components can be appropriately selected depending on the type of salt and the type of binder. The content of other components in the fire extinguishing agent is, for example, 40% by mass or less.

[0037] (binder) The binder may contain at least one of a polyvinyl acetal resin and a polyvinyl alcohol resin. Both polyvinyl acetal resins and polyvinyl alcohol resins are hydroxyl group-containing resins. The higher the degree of acetalization of a polyvinyl acetal resin, the more hydrophobic the resin becomes, making it easier to suppress moisture absorption by salts. Because polyvinyl alcohol resins are not acetalized, they have a larger number of hydroxyl groups than polyvinyl acetal resins, but they are also thought to have more reaction sites with other resin components than the above resins. Therefore, from the perspective of binder design, polyvinyl alcohol resins have a higher degree of design freedom and are easier to handle.

[0038] Polyvinyl alcohol resins are obtained by saponifying polyvinyl acetate resins. Examples of polyvinyl acetate resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate with other monomers. Examples of other monomers include unsaturated carboxylic acids, unsaturated sulfonic acids, olefins, vinyl ethers, and acrylamides having an ammonium group.

[0039] The degree of saponification of the polyvinyl alcohol resin is not particularly limited, but may be 80 mol% or more, or may be 95 mol% or more. When the polyvinyl alcohol resin has an appropriate degree of saponification, adhesion to salt is easily improved and moisture absorption by salt is easily suppressed.

[0040] The polyvinyl alcohol resin may be modified. Modification modes include acetoacetyl group modification, carboxylic acid modification, carbonyl group modification, sulfonic acid modification, hydrazide group modification, thiol group modification, alkyl group modification, silyl group modification, polyethylene glycol group modification, ethylene oxide group modification, modification with a group having a urethane bond, and phosphate ester group modification. By modifying the polyvinyl alcohol resin, adhesion to salts is likely to be improved and moisture absorption by salts is likely to be suppressed.

[0041] The polyvinyl acetal resin can be obtained by acetalizing a polyvinyl alcohol resin.

[0042] The degree of saponification of the polyvinyl alcohol resin used to obtain the polyvinyl acetal resin is not particularly limited, but may be 80 mol % or more, or 95 mol % or more.

[0043] The aldehyde used for acetalization is not particularly limited, but examples thereof include aldehydes having an aliphatic group or aromatic group having 1 to 10 carbon atoms. Examples of aldehydes include aliphatic aldehydes such as formaldehyde, acetaldehyde, propionaldehyde, n-butylaldehyde, isobutyraldehyde, n-valeraldehyde, n-hexylaldehyde, 2-ethylbutyraldehyde, 2-ethylhexylaldehyde, n-heptylaldehyde, n-octylaldehyde, n-nonylaldehyde, n-decylaldehyde, and amylaldehyde; and aromatic aldehydes such as benzaldehyde, cinnamaldehyde, 2-methylbenzaldehyde, 3-methylbenzaldehyde, 4-methylbenzaldehyde, p-hydroxybenzaldehyde, m-hydroxybenzaldehyde, phenylacetaldehyde, and β-phenylpropionaldehyde. These aldehydes may be used alone or in combination of two or more. Among these, from the viewpoint of excellent acetalization reactivity, the aldehyde may be butyl aldehyde, 2-ethylhexyl aldehyde, or n-nonyl aldehyde, or may be butyl aldehyde.

[0044] The ketone used for acetalization is not particularly limited, but examples thereof include acetone, ethyl methyl ketone, diethyl ketone, t-butyl ketone, dipropyl ketone, allyl ethyl ketone, acetophenone, p-methylacetophenone, 4'-aminoacetophenone, p-chloroacetophenone, 4'-methoxyacetophenone, 2'-hydroxyacetophenone, 3'-nitroacetophenone, P-(1-piperidino)acetophenone, benzalacetophenone, propiophenone, benzophenone, 4-nitrobenzophenone, 2-methylbenzophenone, p-bromobenzophenone, cyclohexyl(phenyl)methanone, 2-butyronaphthone, 1-acetonaphthone, 2-hydroxy-1-acetonaphthone, and 8'-hydroxy-1'-benzonaphthone.

[0045] The amount of aldehyde and ketone used can be appropriately set depending on the degree of acetalization. For example, the total amount of aldehyde and ketone can be 0.30 to 0.45 hydroxyl group equivalents relative to the hydroxyl groups of the polyvinyl alcohol resin before the reaction.

[0046] The amount of hydroxyl groups (residual hydroxyl value) of the polyvinyl acetal resin may be 10 to 40 mol %, or 15 to 25 mol %. When the amount of hydroxyl groups is within the above range, hydrophobicity is obtained due to the aliphatic and aromatic groups of the aldehyde and ketone, and the moisture absorption speed tends to be slowed down. The amount of hydroxyl groups is the ratio (mol %) of the amount of ethylene groups to which hydroxyl groups are bonded to the total amount of ethylene groups in the main chain. The amount of ethylene groups to which hydroxyl groups are bonded can be calculated, for example, by a method in accordance with JIS K6728 "Testing Methods for Polyvinyl Butyral."

[0047] The polyvinyl acetal resin and the polyvinyl alcohol resin may be used alone or in combination of two or more kinds.

[0048] The weight-average molecular weight Mw of the polyvinyl acetal resin and the polyvinyl alcohol resin may be 10,000 or more, or 20,000 or more, or 150,000 or less, or 100,000 or less. When the weight-average molecular weight Mw is equal to or greater than the lower limit, the hydrophobicity of the resin is easily ensured. When the weight-average molecular weight Mw is equal to or less than the upper limit, the resin flexibility is easily ensured, and the flexibility and coatability are easily improved. The weight-average molecular weight Mw can be calculated by GPC.

[0049] The glass transition temperature Tg of the polyvinyl acetal resin and the polyvinyl alcohol resin may be 55°C or higher, or 80°C or higher, or 110°C or lower, or 100°C or lower. When the glass transition temperature Tg is higher than the lower limit, the crystallinity is increased, making it easier to ensure the hydrophobicity of the resin. When the glass transition temperature Tg is lower than the upper limit, it makes it easier to improve the coatability. The glass transition temperature Tg can be measured by thermal analysis using a differential scanning calorimeter.

[0050] The content of the polyvinyl acetal resin and polyvinyl alcohol resin contained in the binder can be 40% by mass or more, 70% by mass or more, or even 100% by mass based on the total amount of the binder, in order to fully exhibit the properties of the resins.

[0051] The binder may contain other components in addition to the resins described above to suppress moisture absorption by salts due to improved hydrophobicity. Examples of such other components include a silane coupling agent. The content of such other components in the binder is, for example, 60% by mass or less.

[0052] (liquid medium) Examples of the liquid medium include organic solvents. Examples of the organic solvent include water-soluble solvents, such as alcohols such as methanol, ethanol, isopropyl alcohol, and n-propyl alcohol; ketones such as acetone and methyl ethyl ketone; glycols such as ethylene glycol and diethylene glycol; and glycol ethers such as N-methylpyrrolidone (NMP), tetrahydrofuran, and butyl cellosolve. Since the fire extinguishing agent may be hygroscopic, the liquid medium may be an alcohol-based solvent, specifically a mixed solvent of ethanol and isopropyl alcohol.

[0053] The amount of the liquid medium may be adjusted appropriately depending on the method of use of the composition for forming a fire extinguishing material, but may be 40 to 95 mass % based on the total amount of the composition for forming a fire extinguishing material. The composition for forming a fire extinguishing material containing the liquid medium can be called a coating liquid for forming a fire extinguishing material.

[0054] <Fire extinguishing material formation method> The fire extinguishing material can be formed by applying a coating liquid for forming the fire extinguishing material onto a support layer, and then drying the coating liquid. The support layer can be a polyester resin layer (for example, a PET layer).

[0055] The application can be carried out by a wet coating method, such as gravure coating, comma coating, spray coating, dip coating, curtain coating, spin coating, sponge roll coating, die coating, or brush coating.

[0056] The viscosity of the coating liquid for forming a fire-extinguishing material is preferably 1 to 2000 mPa·s if the gravure coating method is used, 500 to 100,000 mPa·s if the comma coating method is used, and 0.1 to 4000 mPa·s if the spray coating method is used. The amount of the liquid medium may be adjusted appropriately so that the coating liquid viscosity falls within the desired range. Viscosity can be measured using a coaxial double cylinder rotational viscometer.

[0057] The fire extinguishing material can also be obtained by molding a composition for forming a fire extinguishing material.

[0058] Fire extinguishing materials react to the heat generated by ignition and automatically extinguish the fire. Therefore, fire extinguishing materials can also be called self-extinguishing materials (those obtained by molding are particularly called self-extinguishing molded products).

[0059] <Electrical equipment> The electrical equipment includes an electrical device and a housing that houses the electrical device. The fire extinguishing body is provided on at least a portion of the inner wall of the housing, facing the electrical device. Examples of the inner wall of the housing include the back, front, side, and top of the housing, as well as a wiring cover. Examples of the electrical equipment include power receiving and transforming equipment such as distribution boards and switchboards, and operation and control panels for production equipment, etc. Examples of the electrical equipment include terminal blocks, transformers, breakers, capacitors, earth leakage breakers, electrical wiring, etc., provided on these panels. These electrical devices can be considered to be parts of the electrical equipment that are at risk of fire. Electrical equipment usually includes multiple electrical devices, and a fire extinguishing body may be provided for at least one of the electrical devices, or for each of all of the electrical devices. One fire extinguishing body may be provided facing multiple electrical devices. By providing the fire extinguishing body, which has excellent initial fire extinguishing performance, in advance within such electrical equipment, the occurrence and spread of a fire can be prevented.

[0060] FIG. 3 is a schematic external view of electrical equipment according to one embodiment. FIG. 3 illustrates a distribution board as an example of electrical equipment. Electrical equipment 100 primarily includes a housing 101 having a storage compartment 101a and an opening / closing door 101b for storing electrical equipment, a circuit breaker 103, and wiring 104 as electrical equipment. A portion of wiring 104 is housed within a wiring cover 102. This electrical equipment 100 may include, for example, a fire extinguisher 30a on the side of opening / closing door 101b facing the electrical equipment, a fire extinguisher 30b on the top surface of storage compartment 101a facing the electrical equipment, a fire extinguisher 30c (the installation position is shown in the figure for simplicity) on the underside of wiring cover 102 facing the electrical equipment, and a fire extinguisher 30d on the rear side of storage compartment 101a facing the electrical equipment, i.e., behind the electrical equipment. Electrical equipment 100 may include all or at least one of these fire extinguishers.

[0061] The position of the fire extinguisher is not limited to the embodiment shown in Fig. 3, and the position can be adjusted appropriately depending on the location of electrical equipment, etc., which is a location at risk of fire. Furthermore, if the distance between the fire extinguisher and the electrical equipment is large, a member for adjusting the distance may be provided and the fire extinguisher may be provided on the member.

[0062] The distance between the electrical equipment and the fire extinguishing unit can be adjusted as needed, but is preferably 150 mm or less, and more preferably 120 mm or less or 100 mm or less. This allows for more efficient initial fire extinguishing. The distance between the electrical equipment and the fire extinguishing unit refers to the shortest distance between the electrical equipment and the fire extinguishing unit located opposite it. For example, for electrical equipment located directly below the top surface of the storage section 101a and 150 mm or less from the top surface, the fire extinguishing unit can be located on the top surface. Furthermore, for electrical equipment located opposite the opening / closing door 101b and 150 mm or less from the opening / closing door 101b, the fire extinguishing unit can be located on the opening / closing door 101b. While it is desirable to install the fire extinguishing unit close to the electrical equipment, if it is too close, there is a risk of contact between the two, so it is preferable to maintain a distance of at least 1 mm between them. [Example]

[0063] The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples.

[0064] <Creating a fire extinguishing body> The following main raw materials were prepared. The average particle size D50 of tripotassium citrate was adjusted by grinding it in an agate mortar and then filtering it through an 800 mesh mesh. Tripotassium citrate: Manufactured by Fujifilm Wako Co., Ltd., product name: Tripotassium citrate monohydrate, D50 = 3-18 μm Polyvinyl butyral: Weight average molecular weight (calculated value) Mw 20,000 to 100,000, hydroxyl group content 15 to 25 mol%, glass transition temperature Tg 80 to 100°C

[0065] A coating solution (fire extinguishing material coating solution) containing 25% by mass of potassium salts including tripotassium citrate, 8% by mass of polyvinyl butyral, and 67% by mass of ethanol solvent was prepared. The resulting coating solution was applied to a polyethylene terephthalate (PET) film using an applicator (gap 750 μm) and dried in an oven at 100°C for 4 minutes. This resulted in a fire extinguishing body with a 200 μm-thick fire extinguishing material formed on the PET film. The resulting fire extinguishing body was cut to a size of 100 mm x 150 mm and subjected to the following fire extinguishing test.

[0066] <Fire extinguishing test> Example 1 A steel enclosure measuring 400 mm wide, 600 mm high, and 200 mm deep was prepared. A glass door was installed inside the enclosure, allowing the interior to be seen. Twenty air intake holes were provided on each side of the enclosure to prevent the ignited solid fuel from suffocating and extinguishing. The hole diameter was 10 mm. Next, a support member was installed in the center of the back of the enclosure, and a terminal block was placed on top of it. A fire extinguisher was attached with double-sided tape to the rear of the enclosure, facing the terminal block, with the extinguishing material side facing the terminal block. The distance between the terminal block and the fire extinguisher was 4 mm. Five grams of solid fuel was then placed on the terminal block and ignited with a lighter, and the enclosure door was closed. Approximately seven seconds after the door was closed, the fire was extinguished by the extinguishing material.

[0067] Example 2 A terminal block was installed inside the housing in the same manner as in Example 1. A fire extinguisher was attached with double-sided tape to the top surface of the housing, facing the terminal block, with the fire-extinguishing material side of the fire extinguisher facing the terminal block. The distance between the terminal block and the fire extinguisher was 150 mm. Five grams of solid fuel was then placed on the terminal block and ignited with a lighter, and the housing door was closed. Approximately 28 seconds after the door was closed, the fire was extinguished by the fire extinguishing material. [Explanation of symbols]

[0068] 10, 20, 30a, 30b, 30c, 30d...fire extinguishing body, 11, 21...packaging bag, 11a...sealing portion, 211...first resin layer, 212...second resin layer, 22...fire extinguishing material, 23...adhesive layer, 24...sticky layer, 25...release film, 26...support layer, 100...electrical equipment (distribution board), 101...housing, 101a...accommodation portion, 101b...opening / closing door, 102...wiring cover, 103...breaker, 104...wiring.

Claims

1. The fire extinguishing device includes an electric device and a housing that houses the electric device, and a fire extinguishing body is provided on at least a part of an inner wall of the housing so as to face the electric device, The fire extinguishing body includes a packaging bag and a fire extinguishing material sealed in the packaging bag, the fire extinguishing material being formed from a composition containing a fire extinguishing agent and a binder.

2. The electrical equipment according to claim 1, wherein the distance between the electrical equipment and the fire extinguishing body is 150 mm or less.

3. 3. The electrical equipment according to claim 1, wherein the fire extinguishing agent contains at least one salt selected from the group consisting of an organic salt and an inorganic salt, and the binder contains at least one resin selected from the group consisting of a polyvinyl acetal resin and a polyvinyl alcohol resin.

4. The electrical equipment according to claim 3, wherein the fire extinguishing material contains 70 to 97 mass% of the salt based on the total amount of the salt and the resin.

5. 5. The electrical equipment according to claim 3, wherein the salt is a potassium salt.

6. The electrical equipment according to any one of claims 1 to 5, wherein the fire extinguishing body includes an adhesive layer, and the fire extinguishing body is provided on the inner wall via the adhesive layer.

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