JPS647529Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a lighting device that can be used safely even in dangerous places where flammable or explosive gases are present.

<Background Art> Conventionally, there has been no suitable lighting device that can be used safely in an atmosphere where flammable or explosive gases are present, such as in a class 0 hazardous area defined by JIS-C0903. For this reason, when lighting is required inside such dangerous places, such as towers or tanks containing hydrogen or other dangerous substances, for example, for inspection or repair work, faint light entering from manholes etc. They used methods such as using lights and mirrors to bring in light to illuminate the desired areas.

However, with such an irradiation method, it cannot be said that the irradiation to the target area is sufficient, and there are problems in terms of workability and safety.

<Purpose of the invention> This invention was made in view of the above circumstances.
The heat rays contained in the light emitted by the light source inside the case are effectively blocked by the heat ray absorbing glass and cold filter, and the heat sink and cooling fan suppress the temperature rise of the case, making it sufficient for work. While ensuring a sufficient amount of light, the heat energy dissipated to the outside is suppressed to a safe amount to prevent gas explosions, and it can be used safely even in dangerous atmospheres where flammable or explosive gases exist, and the target area is sufficiently illuminated. We provide lighting equipment that can
The purpose of this is to improve workability and safety in a dangerous atmosphere.

<Summary of the invention> For this reason, the present invention includes a light emitting source that emits light beams, a heat ray absorbing glass to block the heat rays included in the light rays, and a cold ray inside a case that has a flameproof explosion-proof structure and a heat sink on the outside. filter and
a light source section formed with a cooling fan that cools the case; a light guide section having a flexible structure whose base end is connected to the light source section and conveys the light beam after the heat rays are blocked; and the light guide section. By providing an irradiation section attached to the tip of the beam guide section and irradiating the carrier light to the outside, the light source section can be installed in a Class 1 hazardous area, and the beam guide section and the irradiation section at the tip can be installed in a Class 1 hazardous area. As a result, sufficient illumination can be obtained even in any work place in a Class 0 hazardous area that is far from the light source, or in a narrow space where a flameproof explosion-proof lighting device cannot be brought in.

<Example> Examples of the present invention will be described below.

In FIGS. 1 to 4 showing one embodiment of the present invention, the lighting device of this embodiment is as shown in FIG.
A light source part 1 having a flameproof explosion-proof structure that can be installed in a Class 1 hazardous area specified by JIS-C0903, and a light source part 1
A light guide section 2 for conveying the light beam emitted by the light source section 1 to a location away from the light source section 1, and a JIS-1 attached to the tip of the light guide section 2 for irradiating the light conveyed through the light guide section 2 to the outside. It consists of an irradiation section 3 that can be used in Class 0 hazardous areas defined by C0903 and Class 1 hazardous areas.

Next, the light source section 1, the light guide section 2, and the irradiation section 3
The details of each structure will be explained in turn.

First, the light source part 1 having a pressure-resistant and explosion-proof structure has a fin-shaped heat sink 12 on the outer periphery, and a casing 11 in which a coupling part 16 for coupling the base end of the light guide part 2 and a handle 17 are formed. Inside the casing 11 are a light emitting source 13 connected to an external power source (not shown) via a cord 15, and a cooling fan 14 for cooling the light emitting source 13 and heat ray absorbing glass 22, which will be described later. , a cold filter 21 that reflects heat rays included in the light emitted from the light emitting source 13, the aforementioned heat ray absorbing glass 22 that absorbs the heat rays, and high-strength glass 23 are provided. Here, the cold filter 21 is
A device that reflects light in a specific wavelength range, such as a multilayer thin film on glass (for example, a transparent dielectric thin film sandwiched between translucent metal thin films).
It is coated. The heat ray absorbing glass 22 is also called infrared absorbing glass, which absorbs infrared rays contained in light rays. In this example, the cold filter and the heat-absorbing glass are shown as separate bodies, but the functions of the cold filter and the heat-absorbing glass can be provided by directly applying a multilayer thin film coating to the heat-absorbing glass. It may also be a configuration.

Here, the light emitting source 13 is arranged at a position where its optical axis coincides with the axis of the light guide section 2 attached to the coupling section 16. Further, the cold filter 21, the heat ray absorbing glass 22, and the high-strength glass 23 are arranged in this order facing the light emitting source 13 at appropriate intervals from the light emitting source 13 side, and the holding fittings 24, 25, 26 to the casing 11. Among them, the high-strength glass 23 is tightly attached between the inner surface of the joint portion 16 of the casing 11 and the holding fitting 26 via a gasket 27. Furthermore, the cooling fan 14 is arranged below the heat ray absorbing glass 22 and the light emitting source 13.

Next, the light guide section 2 is configured to put an optical fiber bundle 31, which is a bundle of a large number of optical fibers, into a vinyl tube 32, for example, and to protect the vinyl tube 32 with a metal spiral flexible protection tube 33. . The base end of the light source section 1
It is fixed to the connecting portion 16 of the casing 11 by a nut 18. Furthermore, a mounting bracket 34 for the irradiation section 3 is fixed to the tip of the protection tube 33.

Furthermore, the irradiation unit 3 includes a protective glass 41 that is closely fixed to the mounting bracket 34 at the tip of the light beam guide unit 2 via a gasket 42 and protects the tip of the optical fiber bundle 31 from dust, rainwater, and other harmful liquids and gases.
It is composed of an irradiation lens 43 and a lens holder 45 that holds the lens 43. Further, as an illumination angle adjustment mechanism, the lens holder 45 is fitted to the outer periphery of the mounting bracket 34 so as to be slidable in the front-back direction, and can be fixed at any position on the mounting bracket 34 with a set screw 46. 47 is a seal member interposed between the periphery of the irradiation lens 43 and the lens holder 45.

When using this lighting device, set the light source section 1 to 1.
The irradiation unit 3 is placed near the irradiation point in the type 0 or type 1 hazardous area. According to this lighting device, the light emitted from the light source 13 passes through the cold filter 21, the heat absorbing glass 22, and the high-strength glass 23.
pass through sequentially. At this time, most of the heat rays included in the light rays are reflected by the cold filter 21, but the heat rays that are not reflected and pass through the cold filter 21 are absorbed by the heat ray absorbing glass 22. Therefore,
The light that reaches the light guide section 2 through the high-strength glass 23 is cold light that does not contain heat rays, and there is no risk of gas explosion even if it is emitted into a Class 0 hazardous area. The flexible protection tube 33 and the like will not be damaged.

In addition, the heat generating elements such as the light emitting source 13 and the heat ray absorbing glass 22 of the light source unit 1 are cooled by applying air flow from the cooling fan 14 from below as shown by the arrow in FIG. 3, and the heat is removed. The absorbed air hits the inner wall of the casing 11, flows along the inner wall surface, and transfers heat to the casing 11. The heat transferred to the casing 11 is then dissipated into the atmosphere by the heat sink 12 on the outer periphery of the casing 11 as shown by the arrows in FIG. Therefore,
In addition to suppressing the temperature inside the casing 11 from rising excessively, the heat sink 12 increases the outer surface area of the case 11.
It is possible to prevent an increase in the outer surface temperature of 1.

On the other hand, the cold light beam that has entered the light guide section 2 is conveyed by the optical fiber bundle 31 to the irradiation section 3 at the tip of the light guide section 2, and is irradiated to the outside via the protective glass 42 and the irradiation glass 43.

In this case, since the light guide section 2 has a flexible structure, the direction and position of the irradiation section 3 can be changed arbitrarily, and the target area can be appropriately illuminated. In addition, if the lens holder 45 is moved forward relative to the mounting bracket 43 as shown by the chain line in FIG. can be made larger.
Therefore, even if the irradiation section 3 is fixed, it is convenient to be able to adjust the irradiation range by expanding or narrowing it.

As mentioned above, if this irradiation device is used, JIS
- Work such as inspection and repair in Class 0 and Class 1 hazardous areas stipulated by C0903 can be performed easily and safely and reliably.

In this embodiment, an external power source is used, but a built-in power source using a battery or the like may be used. In addition, in addition to providing a plurality of light emitting sources in the casing, a plurality of coupling parts of the light guide part are formed corresponding to each light emission source, or a plurality of coupling parts of the light guide part are formed for one light emission source. It may also be configured such that a plurality of locations can be irradiated at once from one light source section. Furthermore, high-strength glass,
The arrangement order and number of heat-absorbing glasses and cold filters may be changed depending on the conditions of the light beam from the light source (the amount of infrared components contained in the light beam), the conditions of the optical fiber, etc. It is not limited.

<Effects of the invention> As described above, according to the invention, the heat rays contained in the light rays from the light emitting source are blocked by the heat ray absorbing glass and the cold filter, so the amount of thermal energy of the light irradiated to the outside can be sufficiently reduced. can do. Furthermore, the cooling fan and heat sink can suppress the temperature rise of the case. Therefore, the light source unit can be transported and installed in a Class 1 hazardous area, and the irradiation unit can be brought close to the work place not only in a Class 1 hazardous area but also in a Type 0 hazardous area, which eliminates the need to bring the light source unit in with the conventional method. Work can be performed safely under sufficient lighting in previously dangerous Class 0 hazardous areas. In addition, sufficient illumination can be obtained even in a narrow place such as a Class 1 hazardous area where a light source with a flameproof and explosion-proof structure cannot be brought into the room. Therefore, it has great practical value as it greatly improves workability and safety in places with dangerous atmospheres where flammable or explosive gases exist, where it has been difficult to secure sufficient lighting in the past. big.

[Brief description of the drawings]

Fig. 1 is an overall view of one embodiment of the present invention, Fig. 2 is a sectional view of the main part of the light source section of the same embodiment, and Fig. 3 is a cross-sectional view of the main part of the light source section of the same embodiment.
The view in the direction of arrow A in the figure and FIG. 4 show a half-sectional view of the irradiation section of the same embodiment. DESCRIPTION OF SYMBOLS 1... Light source part, 2... Light guide part, 3... Irradiation part, 11... Casing, 12... Heat sink, 13... Light emitting source, 14... Cooling fan, 16
...Connection part, 21...Cold filter, 22...
...Heat ray absorbing glass, 23...High strength glass, 27
...Gasket, 31...Optical fiber bundle, 32...
...Vinyl tube, 33...Flexible protection tube, 3
4...Mounting bracket, 41...Protection glass, 42...
Gasket, 43... Irradiation lens, 45... Lens holder.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a lighting device that can be used in a dangerous atmosphere where flammable or explosive gases exist, a light beam is a light source unit comprising a light emitting source that emits light, a heat ray absorbing glass and a cold filter for blocking heat rays included in the light rays, and a cooling fan that cools the inside of the case;
a light ray guide section having a flexible structure whose base end is connected to the light source section and conveys the light beam after the heat rays have been blocked; and an irradiation section attached to the tip end of the light guide section and irradiating the carried light to the outside. A lighting device for hazardous areas, characterized by comprising: (2) The lighting device for hazardous areas according to claim 1, wherein the irradiation section has an irradiation angle adjustment mechanism that can change the light irradiation angle.