JP2013247232A - Explosion-proof container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light explosion-proof container with an excellent handling property capable of securing safety at a dangerous place by reliably giving a charging-prevention performance without a need of a charging test.SOLUTION: An explosion-proof container 100 comprises: a container body 10 made of a plastic material 1 and a glass film 2 coating an entire face of the plastic material 1, and housing electric components inside; and a lid body 20 made of the plastic material 1 and the glass film 2 coating the entire face of the plastic material 1, and closing the container body 10.

Description

  The present invention relates to an explosion-proof container that is lightweight and excellent in handleability while ensuring safety in a hazardous area.

  Here, the explosive atmosphere is a mixture of dangerous substances (gas, vapor or dust) and air (or oxygen) in normal atmospheric conditions (101.3kPa-1013mbar, 20 ℃). An atmosphere that is in a state of propagating to an unburned portion of the mixture.

  An ignition source is an electrical phenomenon that occurs in electrical / instrumentation equipment and has energy that can ignite an explosive atmosphere. For example, an arc discharge or spark generated in electrical / instrumentation equipment. It is a discharge or abnormally overheated part.

  Further, the dangerous place refers to a place where there is or is likely to be a flammable gas or flammable liquid vapor (hereinafter collectively referred to as explosive gas) or dust.

  Furthermore, the explosion-proof structure refers to a structure that can prevent the ignition of explosive gas around the equipment based on these even if there are electrical sparks or high temperature parts that have the ability to ignite the explosive gas inside the equipment. There are explosion-proof structure, oil-filled explosion-proof structure, internal pressure explosion-proof structure, intrinsically safe explosion-proof structure, safety-enhanced explosion-proof structure, resin-filled explosion-proof structure, non-ignition explosion-proof structure, etc.

  When electrical equipment is used in a hazardous area, there is a considerable risk that the electrical equipment may cause an explosion, and therefore it is necessary to make the electrical equipment explosion-proof. Conventionally, in electrical equipment, explosion-proof electrical equipment having a predetermined explosion-proof structure in which each electrical component constituting the electrical equipment is housed in a special container has been developed and used.

  Explosion-proof containers used in conventional explosion-proof electrical equipment are regulated by related standards and laws, and are usually manufactured according to such regulations and only those that have been certified are used. With regard to this explosion-proof container, there is a risk of explosion in a hazardous area if sparks are generated due to static electricity. Therefore, when using plastic that is easily charged as a container, the surface resistance should be 1 GΩ or less as an antistatic measure. It is requested.

  If the surface resistance exceeds 1 GΩ, measures such as limiting the surface area of the explosion-proof container, attaching a leather case to the explosion-proof container, conducting a charging test, and measuring the capacitance In addition, it was difficult to use plastic as an explosion-proof container.

  On the other hand, conventional explosion-proof electrical equipment has a state in which a thin film of a conductive material is formed on each outer surface and joint surface of a plastic container main body and a lid that form an outer container, and electrical components are accommodated therein. Since the explosion-proof structure is realized by combining them while being electrically connected to each other at the joint surface, the electrical resistance of the device surface can be easily reduced, and sufficient antistatic performance can be achieved over the entire device surface at a uniform potential. As a result, the explosion-proof performance in the hazardous area can be secured by eliminating the danger due to charging, and the features of the plastic container that is lightweight and excellent in handleability can be fully exhibited in the hazardous area (for example, Patent Document 1).

JP 2004-40893 A

  However, the conventional explosion-proof electrical device has a problem that it cannot be put into practical use because the certification body does not recognize the conductive coating film as an explosion-proof measure.

  The present invention has been made to solve the above-mentioned problems, and it is not necessary to perform a charging test, can reliably provide antistatic performance to ensure safety in a hazardous area, and is lightweight and easy to handle. The object is to provide an excellent explosion-proof container.

  The explosion-proof container according to the present invention comprises a plastic material and a glass film that covers the entire surface of the plastic material, and includes a container body that houses electrical components therein, and a plastic material and a glass film that covers the entire surface of the plastic material. And a lid that closes the container main body.

  The disclosed explosion-proof container does not need to be subjected to a charge test, can reliably provide antistatic performance, ensure safety in hazardous areas, and is lightweight and excellent in handleability.

(A) is a top view which shows schematic structure of the explosion-proof container which concerns on the 1st Embodiment of this invention, and is a front view of the explosion-proof container shown to Fig.1 (a). It is sectional drawing of the arrow A-A 'line | wire of the explosion-proof container shown to Fig.1 (a). (A) is a perspective view which shows schematic structure of the explosion-proof container which concerns on the 2nd Embodiment of this invention, FIG.3 (b) is the arrow BB 'line | wire of the explosion-proof container shown to Fig.3 (a). It is sectional drawing.

(First embodiment of the present invention)
1 and 2, an explosion-proof container 100 is an example of a pressure-proof explosion-proof structure, and a plastic material 1 having strength that can withstand an explosion pressure inside the container and the entire surface of the plastic material 1 (outer surface, inner surface, joint surface). ) And a plastic body 1 having strength to withstand the explosion pressure inside the container, and the entire surface of the plastic material 1 (outer surface, inner surface, bonding) And a lid body 20 that closes the container body 10 and is fixed in a pressure-bonded state, and has an explosion-proof structure that isolates the ignition source from the explosive atmosphere. It is a fully closed container.

  In the following description, the surveillance camera 30 will be described as an electrical device including an electrical component housed in the explosion-proof container 100. However, the electrical device that can be an ignition source and the electrical device including the electrical component are described. If there is, it is not limited to the surveillance camera 30.

  The surveillance camera 30 is an existing surveillance camera and will not be described in detail. The video imaged by the surveillance camera 30 is subjected to predetermined image processing, converted into a predetermined signal by a media converter 31 according to a different medium (such as a transmission cable 32), and the explosion-proof container 100 via the transmission cable 32. Shooting data is transmitted to the outside. In addition, other electrical components (not shown) related to the surveillance camera 30 may be housed inside the explosion-proof container 100. The surveillance camera 30 and other related electrical components (for example, a media converter power supply (not shown)) are connected to an external electrical device via a power cable (not shown).

  The glass film 2 of the container main body 10 and the lid 20 is formed by applying a sol-gel method using an alkoxysilane or the like, a vapor deposition method, PVD (Physical Vapor Deposition) to the plastic material 1 of the container main body 10 and the lid 20. It is formed by a method using a vacuum apparatus such as a growth) method or a CVD (Chemical Vapor Deposition) method, or a method of applying a silazane compound as a glass precursor.

  In the explosion-proof container 100 according to this embodiment, the entire surface of the plastic material 1 was covered with the glass film 2 (silica film) by a method of applying a silazane compound.

  The silazane compound according to the present embodiment uses perhydropolysilazane because a completely inorganic silica film (glass film 2) can be formed, but is not limited to perhydropolysilazane. Organopolysilazane in which part or all of hydrogen is substituted with an organic component such as an alkyl group may be used. The silazane compound may be a single composition of perhydropolysilazane or organopolysilazane, or a mixture thereof.

  As a solvent for dissolving or dispersing the silazane compound, benzene, toluene, xylene, dibutyl ether, sorbeso, decalin, or the like can be used, and these can be used alone or in combination.

  The application of the silazane compound to the plastic material 1 is preferably performed by a wet method because it can be processed easily and at low cost. For example, it may be applied manually using a brush, or a spray coating method. Alternatively, coating may be performed by a coating apparatus using a bar coating method or a dip coating method.

  Moreover, the silica conversion method of the silazane compound applied to the plastic material 1 is not particularly limited, and is a method such as exposure to the atmosphere, heat treatment, humidification treatment, plasma treatment, ultraviolet treatment, or exposure to acid-base vapor. Can be used.

  The silazane compound may be applied to the plastic material 1 as it is, but is preferably applied after degreasing and cleaning with an organic solvent that does not attack the plastic material 1, and after the cleaning with the organic solvent, plasma treatment or ultraviolet treatment is performed. It is more preferable to apply after washing with the like. Thus, by performing solvent cleaning, plasma treatment or ultraviolet treatment, the wettability between the plastic material 1 and the silazane compound is improved, and good adhesion can be obtained.

Further, the silica film (glass film 2) made of the silazane compound may be formed directly on the plastic material 1 or formed through a single layer or a plurality of intermediate layers for improving adhesion and dimensional stability. May be.
As the intermediate layer, for example, acrylic resin, polyurethane resin, polyvinyl acetate resin, vinyl acetate resin, amino resin, silicone resin, epoxy resin, polyester resin, polyamide resin, vinyl alcohol resin, styrene resin or melamine resin or Examples thereof include polymer compounds such as a mixture or a copolymer thereof.
Moreover, as an intermediate | middle layer, you may use the layer by silane coupling agents, such as a vinyl functional silane, an acrylic functional silane, an epoxy functional silane, or an amino functional silane.

The container body 10 is provided with a cable gland 11 for inserting and tightening a transmission cable 32 and a power cable (not shown) while maintaining a flameproof structure.
The lid 20 includes a dome-shaped dome portion 21 on the optical axis of the surveillance camera 30 and a flange portion 22 at the periphery of the dome portion 21, and bolts 23 arranged at equal intervals on the flange portion 22 are tightened. Thus, the container body 10 is fixed.

The surveillance camera 30 can capture optical information evenly regardless of the angle of incidence on the dome 21 by matching the focal point (the center of curvature) of the dome 21 and the focal point of the image sensor, and is clear even at the periphery of the field of view. A good image can be obtained.
In addition, when the refractive index of the glass film 2 is larger than the refractive index of the plastic material 1, the light incident on the glass film 2 from the outside of the explosion-proof container 100 is totally reflected at the boundary between the glass film 2 and the plastic material 1. become. For this reason, at least in the dome portion 21, the glass film 2 (for example, silica: 1.46) and the plastic material 1 (for example, polycarbonate) so that the refractive index of the glass film 2 is smaller than the refractive index of the plastic material 1. : 1.59) material must be selected.

  In addition, the plastic material 1 of the container body 10 and the lid 20 according to the present embodiment is lightweight and highly transparent, excellent in impact resistance, heat resistance and low temperature resistance, and the accuracy of the molded product is stable against changes in the environment. However, other plastic materials can be used.

In particular, since the glass film 2 and the plastic material 1 (polycarbonate material) have transparency, the inside of the explosion-proof container 100 can be visually recognized.
In addition, when there is a problem in visually recognizing the inside of the explosion-proof container 100, the container body 10 and / or the glass film 2 and / or the plastic material 1 of the lid 20 are colored, and the container body 10 and / or the lid body. 20 may have an opaque area.

For example, the dome portion 21 of the lid 20 is a transparent region, and the container body 10 and the glass film 2 and / or the plastic material 1 of the flange portion 22 of the lid 20 are colored to flange the container body 10 and the lid 20. It can be considered that 22 is an opaque region.
In this case, the transparent dome portion 21 has nothing to shield light on the optical axis of the surveillance camera 30, so that a clear image outside the explosion-proof container 100 can be photographed and the opaque container body 10. And the flange part 22 of the cover body 20 can change the external appearance of the explosion-proof container 100 to improve the aesthetic appearance, and the inside of the explosion-proof container 100 cannot be seen more than necessary.

  The glass film 2 and / or the plastic material 1 may be colored before the plastic film 1 is coated with the glass film 2, or the plastic film 1 may be coated with the glass film 2. Later, the glass film 2 and / or the plastic material 1 may be colored. That is, the inner surface and / or the outer surface of the container body 10 and / or the lid 20 may be colored, or the inside of the container body 10 and / or the lid 20 (between the glass film 2 and the plastic material 1) is colored. May be.

  As described above, the explosion-proof container 100 according to the present embodiment includes a glass coating in which the glass film 2 is formed on the entire surface (outer surface, inner surface, bonding surface) of the plastic container main body 10 and the lid 20 that form the outer container. To "7.4.1 Applicability" of 7.4 Electrostatic Charges on external non-metallic materials in IEC (International Electrotechnical Commission) standard "IEC60079-0" (especially excluding the application described in "NOTE 2") It will be compliant. For this reason, the explosion-proof container 100 according to the present embodiment eliminates the need for predetermined static electricity countermeasures including a charging test, can eliminate restrictions when the plastic material 1 is used as the explosion-proof container 100, and has excellent handleability. It is.

  In particular, the polycarbonate material as the plastic material 1 is easily affected by an aromatic compound and cannot be used in a dangerous place where an organic solvent is used. On the other hand, the explosion-proof container 100 according to the present embodiment covers the entire surface of the polycarbonate material (plastic material 1) with the glass film 2, so that the polycarbonate material does not touch the outside air (generated gas), and the polycarbonate material is dangerous. It can be used even at a place, and there is an effect that a significant weight reduction can be realized as compared with a metal container.

(Second embodiment of the present invention)
FIG. 3A is a perspective view showing a schematic configuration of the explosion-proof container according to the second embodiment of the present invention, and FIG. 3B is an arrow BB ′ view of the explosion-proof container shown in FIG. It is sectional drawing of a line. 3, the same reference numerals as those in FIGS. 1 and 2 denote the same or corresponding parts, and the description thereof is omitted. In addition, in FIG.3 (b), illustration of the electrical component inside the explosion-proof container 200 is abbreviate | omitted.

In FIG. 3, an explosion-proof container 200 is an example of an intrinsically safe explosion-proof structure, and is composed of a plastic material 1 and a glass film 2 that covers the entire surface (outer surface, inner surface, bonding surface) of the plastic material 1, and is intrinsically safe. The container body 210 is configured by a container main body 210 that houses an electrical component constituted by an explosion-proof circuit, and a plastic material 1 and a glass film 2 that covers the entire surface (outer surface, inner surface, bonding surface) of the plastic material 1. And a lid 220 that closes the container, and are fixed to each other in a state of protecting the electrical components, thereby forming a fully closed container.
Further, the form of the explosion-proof container 200 is not limited to the intrinsically safe explosion-proof structure, but can also be applied to an oil-filled explosion-proof structure, an internal pressure explosion-proof structure, an intrinsically safe explosion-proof structure, a safe increase explosion-proof structure, a resin-filled explosion-proof structure, and a non-ignition explosion-proof structure. it can.

  In the following description, a mobile phone having the explosion-proof container 200 as a casing will be described. However, as long as the electrical component can be an intrinsically safe explosion-proof circuit and an electrical device including the electrical component, the mobile phone is limited. Not a thing.

  In addition, the mobile phone according to the present embodiment has the same configuration as that of an existing mobile phone except for the layer structure of the explosion-proof container 200 that is a casing, and therefore the internal structure and functions of the mobile phone are described in detail. Is omitted.

The lid 220 has an opening through which a display window 221 for visually recognizing a liquid crystal display (LCD), which is a display screen of a mobile phone, and operation switches 41 and 42 for operating the mobile phone are projected. Are arranged.
Further, the container body 210 is provided with an opening for exposing the input / output signal connector 43 for inputting / outputting a signal to / from the mobile phone and the charging connector 44 for charging the mobile phone.
Conventionally, when a plastic container is used for a mobile phone which is such an intrinsically safe explosion-proof electrical device, a leather case has been used as a countermeasure against static electricity. However, the mobile phone according to the present embodiment has a plastic material 1. Since the entire surface is covered with the glass film 2, a leather case is not necessary.

  In addition, the plastic material 1 of the container body 210 and the lid body 220 according to the present embodiment is lightweight and highly transparent, excellent in impact resistance, heat resistance and low temperature resistance, and the accuracy of the molded product is stable with respect to environmental changes. However, other plastic materials can be used.

In particular, since the glass film 2 and the plastic material 1 (polycarbonate material) have transparency, the inside of the explosion-proof container 200 can be visually recognized.
In addition, when there is a problem in visually recognizing the inside of the explosion-proof container 200, the container main body 210 and / or the glass film 2 and / or the plastic material 1 of the cover body 220 are colored, and the container main body 210 and / or the cover body. 220 may have an opaque area.

For example, the display window 221 of the lid 220 is made a transparent region, the region of the lid 220 excluding the display window 221 and the plastic material 1 in the container body 210 are colored, and the lid 220 excluding the display window 221 is colored. It is conceivable that the region and the container body 210 are opaque regions.
In this case, the transparent display window 221 does not shield the light on the LCD of the mobile phone, so that a clear image of the mobile phone can be visually recognized, and the opaque container body 210 and lid 220 Thus, the appearance of the explosion-proof container 200 can be changed to improve the aesthetic appearance, and the inside of the explosion-proof container 200 cannot be visually recognized more than necessary.

  The glass film 2 and / or the plastic material 1 may be colored before the plastic film 1 is coated with the glass film 2, or the plastic film 1 may be coated with the glass film 2. Later, the glass film 2 and / or the plastic material 1 may be colored. That is, the inner surface and / or outer surface of the container body 210 and / or the lid body 220 may be colored, or the interior of the container body 10 and / or the lid body 220 (between the glass film 2 and the plastic material 1) may be colored. May be.

  As described above, the explosion-proof container 200 according to the present embodiment includes a glass coating in which the glass film 2 is formed on the entire surface (outer surface, inner surface, and bonding surface) of the plastic container main body 210 and the lid body 220 that form the outer container. By complying with IEC standard “IEC60079-0”, “7.4 Electrostatic Charges on external non-metallic materials” “7.4.1 Applicability” (especially exempted from “NOTE 2”) . For this reason, the explosion-proof container 200 according to the present embodiment does not require a predetermined countermeasure against static electricity including a charging test, can eliminate restrictions when the plastic material 1 is used as the explosion-proof container 200, and has excellent handleability. It is.

  In particular, the polycarbonate material as the plastic material 1 is easily affected by an aromatic compound and cannot be used in a dangerous place where an organic solvent is used. On the other hand, the explosion-proof container 200 according to the present embodiment covers the entire surface of the polycarbonate material (plastic material 1) with the glass film 2, so that the polycarbonate material does not touch the outside air (generated gas), and the polycarbonate material is dangerous. It can be used even at a place, and there is an effect that a significant weight reduction can be realized as compared with a metal container.

DESCRIPTION OF SYMBOLS 1 Plastic material 2 Glass film 10,210 Container body 11 Cable gland 20,220 Lid 21 Dome part 22 Flange part 23 Bolt 30 Surveillance camera 31 Media converter 32 Transmission cable 41, 42 Operation switch 43 Input / output signal connector 44 Charging connector 100 , 200 Explosion-proof container 221 Display window

Claims (4)

In explosion-proof containers that isolate ignition sources from explosive atmospheres,
A plastic body and a glass body that covers the entire surface of the plastic material, and a container body that houses electrical components therein,
A plastic material and a glass film covering the entire surface of the plastic material, and a lid for closing the container body;
An explosion-proof container comprising: In the explosion-proof container according to claim 1,
An explosion-proof container, wherein the plastic material of the container body and the lid has a strength that can withstand an explosion pressure inside the container and has a pressure-proof explosion-proof structure. In the explosion-proof container according to claim 1 or 2,
An explosion-proof container, wherein the plastic material of the container body and the lid is a polycarbonate material. In the explosion-proof container according to claim 2 or 3,
The plastic material has transparency;
The explosion-proof container, wherein the container body and / or the lid has an opaque region colored in the glass film and / or plastic material.

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