Portable fire resistant box

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a fireproof storage, and more particularly to a portable fireproof box that can be easily taken out in the event of a fire or a natural disaster of an earthquake.

【0002】

[Conventional technology]

A fireproof storage stores everyday valuables and documents that do not need to be stored in a safe deposit box, and protects the stored items from fire and theft. It was devised to make it difficult for anyone other than the owner to unlock it to prevent theft, and it was relatively tolerant of the increase in weight because it was difficult to take it out. Also, in order to improve fire resistance, we have been paying attention to the increase in weight, and in recent years foam concrete has been used as a heat insulating material instead of concrete, but since a thick heat-resistant resin is still used as the surface material, The weight relative to the resulting internal volume was unsatisfactory. In addition, even relatively lightweight foamed concrete and inorganic heat insulating materials had to be thickened to ensure fire resistance.

【0003】

It is also a fact that it is necessary to take out a fireproof storage in an emergency, just as the Kobe earthquake of the year before last got used to the alarm bell again. This is because if it is not a safe, it cannot withstand a large fire that lasts for a long time, and it will be necessary to store items (such as a bankbook) immediately after the disaster. In this way, it is naturally desired that even elderly people and children can take out the refractory storage.

【0004】

As a representative of the prior art, there is Japanese Patent Application Laid-Open No. 61-64985 using the above-mentioned foamed concrete. As an example of using another heat insulating material, that is, a water-containing heat insulating material, there is Japanese Patent Application Laid-Open No. 2-178483. Further, there is Japanese Patent Application Laid-Open No. 3-59283 as an example of using a hydrate or a polycrystalline hydrate. Similarly, a heat-resistant container containing a liquid is disclosed in Japanese Patent Application Laid-Open No. 60-158069. Japanese Patent Application Laid-Open No. 61-106469 is an example in which water-containing particles are mixed in foamed concrete. Japanese Patent Application Laid-Open No. 2-80779 is an example of using a gel containing hydrous gelatin. Further, as an example of using a phase change material having a high latent heat of melting as a heat absorbing material, there is Japanese Patent Application Laid-Open No. 63-147077. As described above, it is known that a hydrogel is used as a material for the "endothermic layer" referred to in the present application even if the composition varies.

【0005】

However, the combination of the endothermic layer and other "insulation layers" is not sufficient to reduce the water content to reduce weight or reduce the wall thickness of the refractory cabinet. The proof reveals the fact that the above-mentioned prior art has not been sufficiently implemented.

【0006】

[Problems to be Solved by the Invention]

An object of the present invention is to eliminate the above problems and provide a portable fireproof box having high fire resistance. Another object of the present invention is to provide a portable refractory box having high fire resistance and light weight. Still another object of the present invention is to provide a portable fireproof box having a highly fireproof and lightweight structure, and having a thin wall portion to secure a large capacity storage chamber. Yet another object of the present invention is to provide a portable fireproof box that is not only locked but also covered by an alarm sound to prevent theft, while ensuring sufficient fire resistance while reducing weight to improve portability. The purpose is.

【0007】

[Means for solving problems]

According to the present invention, in order to achieve the above object, an outer wall made of a metal sheet, a heat-resistant inner wall, an endothermic layer which is made into a gel by impregnating a water-absorbing resin and interposed between the inner and outer walls, and the above-mentioned It is composed of at least one of an inner and outer heat insulating layer that covers the inside and outside of the endothermic layer, and the outer wall has a highly reflective outer surface that reflects radiated heat with high efficiency, and further, the outer wall. Is provided with a portable fireproof box characterized in that water in the water-absorbing resin of the endothermic layer is vaporized by heat from the outside to form escape holes for steam generated.

【0008】

As specified above, the present invention is characterized in that "the outer wall made of a metal sheet has an outer surface that reflects radiant heat with high efficiency". That is, the radiant heat that is about to flow in from the atmospheric temperature at the time of a fire that exceeds 900 ° C is reflected and blocked by the outer surface, and the burden of heat shielding on the "endothermic layer" and "insulation layer" inside the wall is reduced. The gist of the present invention is to reduce the weight and wall thickness of the wall portion. In short, a novel combination of an endothermic layer made by gelling a water-absorbent resin and an outer wall of a metal sheet having a highly reflective outer surface is the gist of the present invention.

【0009】

Also, as is well known in thermodynamics, heat transfer in the temperature range up to about 300 ° C in the air is mainly convection, and at about 300 to 700 ° C, both convection and radiation. Must be taken into account, and above 700 ° C, radiant heat transfer becomes dominant. Even in the inventor's experiment, the JIS standard curve shows that the ambient temperature reaches 700 ° C about 10 minutes after ignition of the heating furnace, and if it is a 1-hour fire resistance test, the fire resistance box is dominant for the remaining 50 minutes. Was exposed to radiant heat transfer.

【0010】

INDUSTRIAL APPLICABILITY

Therefore, the portable fireproof box of the present invention has a highly reflective outer surface on the outer wall exposed to high temperatures to block radiant heat transfer, yet the heat transferred through the outer wall is blocked by the outer insulating layer. The heat transferred beyond the cutoff is absorbed as the heat of vaporization of water vapor from the endothermic layer, and the heat transferred while being absorbed is blocked by the inner heat insulating layer, and finally transferred to the inside of the box through the inner wall. It is characterized by a so-called "gradual heat shielding effect" that attempts to minimize the heat flow.

【0011】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 is a cross-sectional view schematically showing the overall structure of a portable refractory box showing an embodiment of the present invention.

【0012】

As shown in FIG. 1, the portable refractory box of the present invention has a box structure composed of a top (lid) T and a bottom (main body) B. The top T and bottom B are hinged or slid, for example, so that they can be opened and closed. These top T and bottom B are the outer wall 10T (10B), the inner wall 12T (12B), the endothermic layer 14T (14B), and at least one of the outer and inner heat insulating layers 16T (16B) and 18T (18B), respectively. It is composed of.

【0013】

As shown in detail in FIG. 2A, the outer wall 10B (10T) has a highly reflective outer surface 10BS (10TS) that efficiently reflects radiant heat (infrared light) incident from the outside. The outer wall 10B (10T) can be made by drawing a metal sheet (thickness about 0.5 mm) such as stainless steel or iron, which has a high melting point (about 1000 ° C or more) and is relatively inexpensive. In addition, the highly reflective outer surface 10BS (10TS) is a characteristic component of the present invention, which can be formed by a plating layer such as silver plating or chrome plating, and is a ceramic that reflects infrared light. It can also be formed by a coating film in which fine particles or ceramic beads having a high porosity are dispersed in a heat-resistant paint. This coating film formation can be performed by a usual method of spraying or coating.

【0014】

The inner wall 12B (12T) is made of a material that is rigid enough to store and hold stored items and has heat resistance from 4 to 500 ° C. Therefore, it is natural that the same material (heat about 0.4 mm) as the outer wall 10B (10T) can be formed by drawing, but a sheet of another metal material such as aluminum can be formed by drawing or folding. Is also possible. In the case of the same material, the inner wall 12B (12T) is joined to the outer wall 10B (10T) by spot welding or caulking at the edge portion, respectively. When aluminum sheets made of different materials are used, they are caulked and joined to each other. If an aluminum sheet is used, the weight of the entire box can be further reduced.

【0015】

The endothermic layer 14B (14T) is interposed between the outer wall 10B (10T) and the inner wall 12B (10T). .. By gelling water, heat transfer due to convection is suppressed, and in the event of a fire or the like, it is gradually steamed from the outside, and the latent heat of vaporization stagnates the temperature rise, so to speak, an "endothermic action" is obtained. Details of this action are described in 41P to 44P of the April 1994 issue (Vol.42 No.4) of "Industrial Materials" applied to "Fireproof coating materials for buildings". It is desirable for handling that this endothermic layer 14B (14T) is packed in an independent cell shape with an aluminum laminate sheet as described above, but a water absorbing resin is applied to the core material of inorganic fibers such as ceramic fiber and glass fiber. It can also be dispersed, inserted between both walls, and then watered to gel.

【0016】

The outer heat insulating layer 16B (16T) is a sheet of heat insulating material such as ceramic felt, which is arranged so as to cover the outside of the endothermic layer 14B (14T), respectively, and is a metal sheet such as aluminum foil having high heat reflection. It is preferably coated. The outer heat insulating layer 16B (16T) acts to temporarily block the heat transferred through the outer wall 10B (10T) in the event of a fire or the like. Further, the inner heat insulating layer 18B (18T) is arranged inside the endothermic layer 14B (14T), respectively. The inner heat insulating layer 18B (18T) may have the same material and structure as the outer heat insulating layer 16B (16T), but the temperature rise is limited while the endothermic layer 14B (14T) is endothermic. Therefore, a lightweight heat insulating material such as Styrofoam may be sealed with a bag of an aluminum laminated sheet. The outer heat insulating layer 18B (18T) has a function of secondarily blocking the heat conducted to the inner wall 12B (12T).

【0017】

In short, if a large amount of the endothermic layer 14B (14T) is used, the heat insulating effect of the entire wall of the box is improved, but this is accompanied by an increase in the amount of gelled water absorbing resin, so that the weight of the heat insulating wall is increased. Resulting in. By adopting the outer heat insulating layer 16B (16T) and the inner heat insulating layer 18B (18T), the endothermic load of the endothermic layer 14B (14T) is reduced to reduce the overall weight. Only one of the outer insulation layer 16B (16T) and the inner insulation layer 18B (18T) can be used to avoid complication of wall structure and assembly.

【0018】

As described above, a large number of relief holes 10BH (10TH) for discharging water vapor generated from the endothermic layer 14B (14T) to the outside during fire resistance are formed at appropriate positions on the outer wall 10B (10T). These relief holes 10BH (10TH) are arranged in a row near the joint between the outer wall 10B (10T) and the inner wall 12B (12T), for example, so as not to spoil the appearance of the box. The shape of the hole may be circular (about 5φ), elliptical (3 × 10 mm), slot (3 × 30 mm), or the like, and the pitch and the number of rows can be appropriately selected. From an aesthetic point of view, these holes should be covered and sealed with a resin band or the like.

【0019】

On the other hand, in order to keep the article storage portion inside the box at a low temperature for a longer period of time, a relatively thin (about 2 mm) internal heat absorbing layer 12BS (12TS) can be attached to the inner surface of the inner wall 12B (12T). For these internal endothermic layers 12BS (12TS), a gel of a highly endothermic resin similar to the endothermic layer 14B (14T) may be packed with a sheet of a thermoplastic resin. When the pack is torn by the heat that is gradually transferred through the wall of the box and reaches the inner wall 12B (12T) during fire resistance, the moisture contained in it is also steamed and the time to keep the storage part at a low temperature is extended. It is something that can be done. In addition to this extension of the low temperature time, since the storage portion can be filled with steam, it is possible to make it difficult to burn papers such as documents and banknotes. This flame-retardant effect can be further improved by containing an aqueous solution type fire extinguishing liquid of inorganic salts. When this internal endothermic layer 12BS (12TS) is arranged, a contact part (seal part) (not shown) is arranged on the abutting surface of the top T (bottom B), and these are melted by heat from the outside. Then, the generated water vapor can be released from the disappearance gap.

【0020】

Further, as shown in FIG. 2B, the endothermic layer 14B (14T) is separated into two or more layers (14-1, 14-2), and an intermediate heat insulating layer 16-1 similar to the heat insulating layer 16B (16T) is formed. It can also be intervened. According to this modification, the intermediate heat insulating layer 16-1 delays the steaming of the endothermic layer 14B (14T), so that the water content can be further reduced and the weight can be reduced.

【0021】

Next, refer to FIG. 3, which schematically shows the entire portable refractory box of the present invention. The portable refractory box has a lid T attached to the main body B via a hinge h. This lid T is locked to the main body B by the lock L. A handle H is attached to the lid T so that the box can be carried. In addition, the central part of the lid T is depressed to provide an alarm A.

【0022】

As shown in FIG. 4, this alarm A is a temperature sensor that detects the ambient temperature and generates a temperature signal when the temperature reaches a predetermined level, and a vibration signal when the vibration is detected and the vibration reaches a predetermined level. It consists of a vibration sensor that generates, a signal processing device (CPU) that generates an operation signal when it receives a temperature signal or vibration signal, a driver that generates a drive voltage when it receives an operation signal, and a buzzer that generates a warning sound when it receives a drive voltage. It is done. The temperature sensor is, for example, a thermistor, and its predetermined temperature is set to 70 ° C (fire detection). In addition, the vibration sensor is a normal inertia type that detects vibration three times in 3 seconds (anti-theft) or generates a vibration signal when vibration with a seismic intensity of about 3 continues for 3 seconds or more (seismic intensity detection). .. Upon receiving any of these signals, the CPU operates the driver with that operating signal to generate a drive signal. This drive signal causes the buzzer to generate a warning sound of about 95 dB.

【0023】

The CPU allows the box owner to set, unlock, and change passwords with a keyboard. When a fire or earthquake occurs, a warning sound is generated to alert the people around. Also, if a third party other than the owner tries to take out the box or unlock it without unlocking the password, it will detect the vibration of the operation and generate a warning sound to prevent psychological theft. Is possible.

【0024】

With the above configuration, a 1-hour refractory test for general paper refractory was performed in a heating furnace based on the JIS standard "standard temperature curve". The specifications of the "fireproof box" used in the experiment are as follows. 1. Box Outer wall dimensions: (400 x 310 x 190 mm) Inner wall dimensions: (360 x 270 x 140 mm) Wall material: Silver-plated outer surface of SUS304 (0.5t) sheet Weight: Spot welded sheet, 3.8kg including reinforcing ribs 2. Adsorption layer Water-absorbent resin packed in an aluminum laminate sheet Approximately 3 kg: Approximately 6 mm thick 3. Outer insulation layer Ceramic felt covered with aluminum sheet: wall thickness about 5mm 4. Relief hole Two rows of 5φ holes are opened on the side wall at a pitch of 50 mm. [0025]

A one-hour fire resistance test was conducted with the above specifications. One hour later, the temperature at the center of the containment chamber was about 170 ° C, which cleared the standard of "refractory for general paper".

【0026】

[Effect of the invention]

In addition, the effect of the present invention will be described in comparison with a typical example of a portable refractory cabinet currently on the market (using a resin wall for foamed concrete, hereinafter referred to as a conventional example).<img file="JPH10231663A_D0001.tif" />As is clear from the table above, the present invention reduces the weight relative to the internal volume by less than half. In addition, the wall thickness has been reduced from 30 mm to 20 mm, resulting in a neat appearance. From these two points, for the same internal volume, the outer dimensions will be smaller and the weight will be halved, and excellent portability that even elderly people and children can carry will be obtained.

【0027】

The present invention is not limited to the above examples, and various modifications can be made based on the gist thereof, and these are not excluded from the scope of the present invention.

[Simple explanation of drawings]

[Figure 1]

It is sectional drawing which shows typically the whole structure of the portable refractory box according to the Example of this invention.

[Fig. 2A]

It is sectional drawing which enlarges and shows a part of the wall part of the portable refractory box of an Example.

[Fig. 2B]

It is a cross-sectional view which shows the deformation example of the wall part shown in FIG. 2A in an enlarged manner.

[Fig. 3]

It is an elevation view which shows the whole structure of the portable refractory box of an Example.

[Fig. 4]

It is a schematic diagram which shows the structure of the alarm used for the portable refractory box of an Example.

[Explanation of symbols]

T top (lid) B bottom (main body) A alarm L lock H handle h hinge 10B (10T) outer wall 12B (12T) inner wall 14B (14T) Endothermic layer 16B (16T) outer insulation layer 18B (18T) Inner insulation layer 10BS (10TS) outer surface 10BH (10TH) relief hole 14-1, 14-2 Separate endothermic layer 16-1 Intermediate insulation layer