JP6111660B2 - Explosion-proof lighting equipment - Google Patents

Description

  The present invention relates to a flameproof explosion-proof luminaire equipped with a light source such as an LED or an organic EL as a light source.

Explosion-proof lighting fixtures are used as lighting fixtures because there is a risk of ignition by leaking gas in joints such as power cables, gas pipes, communication cables, etc. installed in the basement, or factories such as petrochemical plants. In the explosion-proof lighting fixture, a fixture using an LED as an example of a light emitting element as a light source is known. In addition, as an explosion-proof lighting fixture, a pressure-proof explosion-proof lighting fixture having a pressure-resistant structure that prevents a flame from reaching the outside even if an explosion occurs inside is also known.
In a pressure-proof explosion-proof lighting fixture, since a desired pressure-resistant design is relatively easy, when a plurality of containers provided in the lighting fixture are provided, a screwed structure (screw fitting) is generally used for the joining structure of these containers. (See, for example, Patent Document 1 (paragraph 0030)).

JP 2005-93246 A

However, in the screwed structure, if the thread grooves are not machined with high accuracy in each container, the pressure resistance as designed cannot be obtained, so that machining is difficult, and much labor is required for screwing the containers together during assembly. There is a problem.
Therefore, the explosion-proof illuminating equipment that employs a screwed structure as the pressure-resistant structure has poor productivity.
This invention is made | formed in view of the situation mentioned above, and aims at providing the flameproof explosion-proof type lighting fixture which can improve productivity.

In order to achieve the above object, the present invention has a pressure-proof explosion-proof light source container containing a light-emitting element, and a pressure-proof explosion-proof power supply container containing a power circuit of the light-emitting element, and an upper surface of the light source container. In the center of the power supply container is provided with a circular convex portion in plan view, and the bottom surface of the power supply container has a circular shape in bottom view that forms the plane connection surface with the light source container. Protruding portions are provided for wiring through which the electric wiring extending from the power supply container and introduced into the light source container passes through the center of the circular convex portion in plan view and the center of the circular convex portion in bottom view. A through hole is provided, and the electric wiring is passed through each of the wiring through holes, and the convex portion having a circular shape in a plan view and the convex portion having a circular shape in a bottom view are planarly joined. by being fastened, flameproof of contents having a predetermined pressure resistance Together between junction structure is constituted by the distance from the openings forming the through hole for wiring in the joint plane to the exterior, provides flameproof luminaires, characterized in that the desired anti-爆引fire performance is secured To do.

Further, the present invention provides the above explosion-proof illuminating device, wherein a plurality of radiation fins for radiating the heat of the light-emitting elements are provided radially on the upper surface of the light source container and around the circular convex portion in plan view. The respective end portions of the radiating fins are connected to the outer peripheral surface of the circular convex portion in plan view .

  According to the present invention, in the above explosion-proof luminaire, the light source container is formed with an opening in which a step portion into which an edge of a plate-like translucent member is fitted is formed, and the radiating fin is connected to the light source container. The upper surface extends to a position corresponding to the stepped portion.

  Further, the present invention provides the above explosion-proof lighting fixture, wherein the light source container includes a light source container body in which the opening is formed, and a guard provided in the opening of the light source container body, and the guard includes the opening. And a flange that is sandwiched between the opening and fastened with a plurality of fasteners.

  Further, the present invention is characterized in that the explosion-proof luminaire described above is integrally provided with a terminal box having a flameproof structure.

According to the present invention, in addition to the explosion-proof light source container containing the light-emitting element, the pressure-proof explosion-proof power supply container containing the light-emitting element power supply circuit is provided separately. With this configuration, since the light emitting element and the power supply circuit are thermally separated, the output of the light emitting element can be increased while suppressing the thermal influence on the power supply circuit.
In addition to this, the light source container and the power supply container are joined in a plane, and combined with a plurality of fasteners to form a flameproof explosion-proof luminaire, making it easier to manufacture and assemble than the conventional screw fitting structure, Productivity is increased.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the structure of the flameproof explosion-proof type lighting fixture concerning embodiment of this invention, (A) is the perspective view seen from the downward direction, (B) is the perspective view seen from the top. It is a top view of the explosion-proof type lighting fixture of an installation state. It is a bottom view of a pressure-proof explosion-proof lighting fixture. It is sectional drawing of a flameproof explosion-proof lighting fixture. It is a disassembled perspective view of a flameproof explosion-proof lighting fixture. It is the perspective view which looked at the light source container from the upper part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a configuration of a pressure-proof explosion-proof luminaire 1 according to the present embodiment. FIG. 1A is a perspective view of the pressure-proof explosion-proof luminaire 1 in an installed state as viewed from below, and FIG. FIG. 3 is a perspective view of the explosion-proof luminaire 1 in an installed state as viewed from above. 2 is a plan view of the explosion-proof luminaire 1 in an installed state, and FIG. 3 is a bottom view of the explosion-proof luminaire 1. 4 is a cross-sectional view of the explosion-proof luminaire 1 and FIG. 5 is an exploded perspective view of the explosion-proof luminaire 1.
1 to 3 show a so-called direct-hanging installation mode in which the explosion-proof explosion-proof luminaire 1 is installed by being suspended from the existing position box 5.

The explosion-proof luminaire 1 is a luminaire used in a special environment such as a place where explosive gas exists. This explosion-proof luminaire 1 is a so-called explosion-proof structure that can withstand explosion pressure even if volatile gas enters the instrument and explodes inside, and does not ignite external explosive gas. have.
Specifically, as shown in FIGS. 1 and 2, the explosion-proof explosion-proof luminaire 1 includes a light source container 2, a power supply container 3 joined on the light source container 2, and the power supply container 3. And a terminal box 4 joined to each other, each being configured as a container having a pressure-proof explosion-proof structure. In addition to this, since the joint structure between the light source container 2, the power supply container 3, and the terminal box 4 has the same pressure resistance as the above-mentioned explosion-proof structure, the entire explosion-proof luminaire 1 is required for the explosion-proof. Is satisfied. A junction structure among the light source container 2, the power supply container 3, and the terminal box 4 will be described later.

The light source container 2 is a container that houses the LED module 8 (FIG. 3) that is a light source, and the power supply container 3 is a container that houses a power supply circuit 9 (FIG. 4) that generates lighting power of the LED module 8. Since the power supply circuit 9 is provided in the power supply container 3 that is separate from the light source container 2, the LED module 8 and the power supply circuit 9 are thermally separated, so that the LED module is suppressed while suppressing the thermal influence on the power supply circuit 9. High output of 8 is possible. In addition, it is possible to easily cope with an increase in the area of the power supply circuit 9 accompanying the increase in the output of the LED module 8. In this explosion-proof luminaire 1, for example, a plurality of high-power LED modules 8 are housed in the light source container 2 so as to obtain the same amount of light as a conventional fixture using a 400 W class mercury lamp as a light source.
The terminal box 4 is a container for connecting the power supply circuit 9 and the external lead wire 29 (FIG. 4). The external lead wire 29 is an electrical wiring that is connected outside the explosion-proof luminaire 1 to a power supply line that supplies commercial power.

When this explosion-proof explosion-proof luminaire 1 is installed and used in a special environment, as shown in FIG. 1, for example, it is attached to an existing position box 5 on the ceiling surface. The position box 5 supplies commercial power to the explosion-proof luminaire 1 and is used as a mounting base of the explosion-proof luminaire 1 on the ceiling surface.
That is, the position box 5 includes a plurality of fixed legs 6, and the fixed legs 6 are firmly fixed to the ceiling surface with bolts or the like so that they can withstand the load of the explosion-proof luminaire 1. The casing of the position box 5 is provided with an opening 7A for drawing in a power supply line for commercial power extending on the ceiling surface and an opening 7B for drawing in the external lead wire 29 of the explosion-proof luminaire 1. A power supply line drawn from each of the openings 7A and 7B and an external lead line 29 are connected in the position box 5, whereby commercial power is supplied to the explosion-proof luminaire 1. The position box 5 is provided with openings 7A in four directions so that a power supply line can be drawn from an appropriate opening 7A and a feed wiring to another explosion-proof luminaire 1 can be drawn. The unused opening 7A is closed with a plug or the like, for example.

In general, explosion-proof luminaires must be provided with a terminal box for connecting a power supply line and an external lead line according to the standard. On the other hand, in the renovation work for existing explosion-proof lighting fixtures, the replacement of the terminal box to which the conduit tube is connected requires a large amount of repair work. You may be asked to replace only the instrument. However, the terminal box is not compatible because there is no uniform standard for size, shape, etc., and there is a situation where the terminal box is being replaced.
On the other hand, this explosion-proof luminaire 1 is completed as a pressure-proof explosion-proof luminaire according to the standard, since it has a terminal box 4 having a flame-proof structure separately from the existing terminal box.

Next, each part of the explosion-proof luminaire 1 will be described.
As described above, the explosion-proof luminaire 1 is configured by connecting the light source container 2, the power supply container 3, and the terminal box 4.
As shown in FIGS. 4 and 5, the light source container 2 includes a light source container body 10, a translucent member 11, and a guard 12.
The light source container body 10 includes a bottomed cylindrical light source housing portion 13 and a flange 19 formed so as to extend in the radial direction (the outward direction) around the entire periphery of the opening 16 of the light source housing portion 13. And is formed in a general tray (dish) shape having a circular shape in plan view. A plurality of mounting bases 15 are integrally formed on the bottom portion 13 </ b> A of the light source housing portion 13. The mounting bases 15 are provided at substantially equal intervals around the center O (FIG. 3) of the bottom portion 13 </ b> A, and the LED modules 8 are fixed to the respective mounting bases 15. Thereby, as shown in FIG. 3, the plurality of LED modules 8 are arranged around the center O at substantially equal intervals.

  As shown in FIG. 3, the LED module 8 includes a COB type LED 8A. The COB type LED 8A has a high luminance and high output of a chip-on-board (COB) structure in which a large number of LEDs are densely arranged on an LED substrate to form a planar light emitting portion having a substantially circular shape (which may be a quadrangle). Light-emitting device. The explosion-proof explosion-proof luminaire 1 is provided with a plurality of COB-type LEDs 8A as a light source, thereby realizing high brightness and high output.

  As shown in FIGS. 4 and 5, the translucent member 11 is a transparent disc-shaped pressure-resistant member, and is fitted into the opening 16 of the light source container body 10 so as to cover the LED module 8. Specifically, a stepped portion 18 that is recessed toward the bottom portion 13 </ b> A is formed in the opening 16 of the light source container body 10, and the edge portion 17 of the translucent member 11 is supported by the stepped portion 18.

The guard 12 is a member that protects the translucent member 11 from collision of an external object, and is attached to the light source container body 10 so as to cover the translucent member 11.
More specifically, the guard 12 includes an annular portion (flange) 20 that is planarly joined to the flange 19 of the light source container body 10. As shown in FIG. 4, the annular portion 20 has a width W (a length extending in the radial direction (a direction toward the outside)) W at least as large as the flange 19, and the annular portion 20 includes a large number of bolts 21. Thus, the light source container body 10 is firmly fastened to the flange 19. The annular portion 20 is integrally provided with an annular guard portion 22 disposed substantially at the center and a rod-shaped guard portion 23 that extends radially from the annular guard portion 22 and is coupled to the annular portion 20. A member 24 is provided. As shown in FIG. 3, the light source container body 10 is disposed with the COB type LED 8 </ b> A exposed from between the respective bar-shaped guard parts 23, and the shadow of the bar-shaped guard part 23 is less likely to occur in the irradiation field. Yes.

Further, as shown in FIG. 4, the annular step 20 of the guard 12 is formed with a restraining step portion 25 and an annular recess 26 on the entire surface of the light source container main body 10 on the surface in contact with the flange 19. Has been. The edge portion 17 of the translucent member 11 is engaged with the restraining step portion 25, and the translucent member 11 is firmly restrained as the annular portion 20 is fixed to the flange 19 with the bolt 21, so that the explosion-proof explosion-proof. A structured container is constructed. Moreover, the annular recessed part 26 is provided in the outer peripheral side rather than the control step part 25, and the space | interval between the light source container main body 10 and the guard 12 is sealed by the O-ring 27 being fitted.
As shown in FIG. 5, an annular plate-shaped packing 45 is sandwiched between the translucent member 11, the light source container body 10, and the guard 12.

FIG. 6 is a perspective view of the light source container 2 as seen from above.
As shown in FIG. 6, the light source container 2 is integrally formed with a large number of plate-like heat radiation fins 40 extending from the upper surface 10 </ b> A of the light source container body 10 to the outer peripheral surface 10 </ b> B. These radiating fins 40 are members for radiating the heat generated by the internal COB type LED 8A. As a result, even when the COB type LED 8A, which is a high-intensity, high-power LED, is used as the light source, the temperature of the COB type LED 8A can be suppressed to a temperature at which proper operation is possible by these heat radiation fins 40.

Here, as described above, the step portion 18 into which the translucent member 11 is fitted is formed in the opening 16 of the light source container body 10. As shown in FIG. 4, the step portion 18 is recessed from the opening 16 by a depth α. Therefore, in this step portion 18, the thickness T of the flange 19 is reduced by the depth α of the step portion 18, and the strength is increased. become weak. For this reason, when an explosion occurs inside the light source container 2, the stepped portion 18 is easily broken and a predetermined pressure-proof explosion-proof performance cannot be obtained.
Therefore, in the light source container body 10, one end portion 40 </ b> A of some radiating fins 40 is extended to a position corresponding to the stepped portion 18, and the strength is compensated by these radiating fins 40.
More specifically, as shown in FIG. 6, on the upper surface 10 </ b> A side of the flange 19 of the light source container main body 10, convex portions 41 constituting receiving portions are provided at the fastening locations of the bolts 21. Some of the heat radiating fins 40 have one end portion 40A connected to the convex portion 41, so that the heat radiating fins 40 extend to a position corresponding to the stepped portion 18 described above, whereby the strength of the stepped portion 18 is reinforced. .

On the upper surface 10 </ b> A of the light source container main body 10, a convex portion 30 is provided substantially at the center. The convex portion 30 has a substantially disk shape with an upper surface 30 </ b> A forming a flat joint surface with the power supply container 3. The convex portion 30 protrudes to a position at least higher than the surrounding heat radiation fins 40, and the power supply container 3 is coupled to the upper surface 10A while extending the heat radiation fins 40 directly below the upper surface 10A, that is, the internal LED module 8. It is possible.
As shown in FIG. 4, a wiring through hole 31 is formed in the approximate center of the convex portion 30, and a bush 32 is press-fitted into the wiring through hole 31. It is firmly held down. Insertion holes 33A and 33B pass through the bush 32, and electric wires 75 extending from the power supply container 3 are passed through the insertion holes 33A and 33B and introduced into the light source container 2. An annular recess 35 is provided on the upper surface 30A of the convex portion 30 over the entire circumference, and an O-ring 36 serving as a sealing member is fitted therein.

  By the way, as shown in FIG. 4, since the convex portion 30 is provided, the bottom portion 13A of the light source container body 10 is formed with a concave portion 43 that is slightly recessed toward the upper surface 10A. It is easy to break when an internal explosion occurs. Therefore, as shown in FIG. 6, each of the radiating fins 40 has the other end portion 40 </ b> B connected to the outer peripheral surface 30 </ b> B of the convex portion 30, thereby reinforcing the strength of the convex portion 30.

  As illustrated in FIGS. 4 and 5, the power supply container 3 includes a power supply container main body 50 and a bottom body 51. The power container body 50 is integrally provided with a bottomed power circuit housing portion 52 that houses the power circuit 9 and a flange 53 that extends in the radial direction (outward direction). The bottom body 51 is integrally provided with a housing recess 70 that is recessed corresponding to the power circuit housing section 52 and a flange 71 that extends in the radial direction (direction toward the outside), and the power container body 50 and the flange 53 of the bottom body 51. The power supply container 3 having a pressure-proof explosion-proof structure is configured by 71 being joined in a plane and fastened by a large number of bolts 54. A concave portion 56 (FIG. 4) is formed in the flange 71 of the bottom body 51 over the entire circumference in the joint surface, and an O-ring 57 is fitted into the concave portion 56 and sealed.

  As shown in FIG. 4, the upper surface 52 </ b> B of the power circuit accommodating portion 52 is configured to be a flat surface, and a through hole 78 for drawing wiring from the power circuit 9 is formed at the approximate center thereof. A fixing portion 58 for fixing the wiring is provided on the upper surface 52B corresponding to the through hole 78. The fixing portion 58 is a substantially cylindrical member having a communication hole 59 that communicates with the through-hole 78, and a bush 60 pressed by a screw-fastened bush presser 61 is press-fitted into the communication hole 59. The wiring is drawn through the bush 60.

  On the other hand, as shown in FIG. 5, a convex portion 72 having a circular bottom view and a flat bottom surface 72A is integrally provided on the bottom surface 51A of the bottom body 51. The convex portion 72 constitutes a joint surface that is planarly joined to the convex portion 30 of the light source container 2. A wiring opening 73 is opened at the center of the bottom surface 72A of the convex portion 72 and communicates with the wiring through hole 31 of the convex portion 30 of the light source container 2, so that the wiring opening 73 and the wiring through hole are communicated. The electrical wiring 75 is routed from the power supply container 3 to the light source container 2 through 31.

  As shown in FIGS. 4 and 5, the terminal box 4 includes a bottomed cylindrical terminal box main body 62 and a flange 63. A cap 64 is planarly joined to the upper surface 62A of the terminal box main body 62 and is firmly fastened by a large number of bolts 65 (FIG. 5). A support portion 66 that supports the external lead wire 29 is provided in the cap 64. The external lead wire 29 passes through the upper surface 62A of the terminal box main body 62 and is drawn out from the terminal box main body 62, passes through the support portion 66, and through the cap 64 to the outside. The terminal box 4 is provided on the upper surface 52 </ b> B of the power supply container 3 so as to cover the fixing portion 58 with the terminal box main body 62. In the terminal box 4, the end of the external lead wire 29 is the fixing portion 58 of the power supply container 3. Connected to the fixed wiring.

  The assembly of the pressure-proof explosion-proof lighting device 1 will be described. First, the light source container 2 is assembled, and then the power supply container 3 is assembled on the light source container 2. Specifically, the convex part 72 of the bottom body 51 of the power supply container 3 is planarly joined to the convex part 30 of the upper surface 10A of the light source container 2, and both are firmly fastened with a large number of bolts 76 (FIG. 4). Assemble. By this planar joining and fastening with bolts 76, a pressure-explosion-proof container-to-container joint structure having a predetermined pressure resistance performance is formed. Then, the power supply circuit 9 is assembled to the power supply container main body 50, and the bottom body 51 is assembled and connected to the light source container 2. Finally, the power container body 50 is covered with the bottom body 51 and firmly tightened with the bolts 54 to constitute the power container 3 having a pressure-proof explosion-proof structure.

Next, the terminal box 4 is assembled on the power supply container 3. Specifically, the external lead wire 29 is connected to the fixing portion 58 of the upper surface 52 </ b> B of the power supply container 3, and the flange 63 of the terminal box 4 is attached to the upper surface 52 </ b> B of the power supply container 3 so as to cover the fixing portion 58 with the terminal box body 62. And are firmly joined with a large number of bolts 67. By this planar joining and fastening with bolts 67, a pressure-explosion-proof container-to-container joint structure having a predetermined pressure resistance performance is formed. Then, a cap 64 is planarly joined on the terminal box main body 62, and the terminal box 4 is configured with a large number of bolts 65. The cap 64 may be fastened before the terminal box 4 is assembled to the power supply container 3.
Through the above operation, each of the light source container 2, the power supply container 3, and the terminal box 4 is connected, and the explosion-proof explosion-proof luminaire 1 is assembled.

As described above, in the explosion-proof luminaire 1 of the present embodiment, the pressure-proof explosion-proof containers of the light source container 2, the power supply container 3, and the terminal box 4 are joined to each other in a plane and fastened with a large number of bolts. Constructs a pressure-explosion-proof structure between the containers.
With this configuration, the assembly becomes very simple as compared with the conventional joining structure in which the containers are joined by screw fitting.

Further, in the flat joint structure, the explosion-proof performance can be adjusted by the distance of the joint portion. Therefore, by designing the distance between the light source container 2 and the convex portions 30 and 72 of the power supply container 3 and the distance of the flange 63 of the terminal box 4 according to the desired explosion-proof performance, these light source container 2 and power supply container 3 and a desired explosion-proof performance can be obtained in the connecting structure between the terminal box 4.
As a result, a joining structure that is easier to design and process than conventional screw fitting, which requires high-precision design and processing of the thread groove, and the productivity of the lamp is increased.

Explaining the explosion-proof performance and the distance between the joints, the explosion test generally includes an explosion flammability test in addition to an explosion strength test, which is a strength confirmation test against an internal explosion. The explosion flammability test is a safety confirmation test against flame escape.
For example, in a recommended standard called an explosion-proof guideline, in order to prevent flame escape, the minimum distance that the joint portion should secure is determined according to the internal volume of the container and the gas grade. That is, the flame that has ignited in the container passes through the joint surface of the joint, is finally cooled, and only the nonflammable gas is discharged to the outside. At this time, if the distance through which the flame passes through the joint is insufficient, the flame is not completely cooled and is ignited by external gas.

Therefore, in the explosion-proof luminaire 1, between the light source container 2 and the power supply container 3, the openings (wiring through-hole 31, wiring opening 73) in the joint surface of the convex portions 30 and 72 are exposed to the outside. The desired explosion-proof flammability is ensured by adjusting the distance to reach.
Moreover, between the power supply container 3 and the terminal box 4, desired explosion-proof flammability is ensured by adjusting the width | variety (distance extended in radial direction) of the flange 63 which is a joint surface of both.
Note that the shape of the light source container 2, the power supply container 3, and the terminal box 4, the number of bolts as fastening metal fittings, and the pitch at which the bolts are tightened are also related to explosion-proof flammability performance and explosion-proof strength performance. In consideration of this, the distance between the joints is determined.

In the present embodiment, each of the light source container 2, the power supply container 3, and the terminal box 4 also constitutes an explosion-proof container by plane joining and bolt fastening, so that each container is designed, processed, and assembled. It has also become easier and the productivity of lamps has been greatly enhanced.
In addition to the light source container 2 containing the LED module 8, the power supply container 3 containing the power supply circuit 9 is provided separately, so that the LED module 8 and the power supply circuit 9 are thermally separated, and the power supply The output of the LED module 8 can be increased while suppressing the thermal influence on the circuit 9.

Further, in the present embodiment, a convex portion 30 that is planarly bonded to the power supply container 3 is provided in the approximate center of the upper surface 10A of the light source container 2, and a large number of heat generated from the LED module 8 is radiated around the convex portion 30. The heat dissipating fins 40 are provided radially.
According to this configuration, the convex portion 30 on the upper surface 10A of the light source container 2 forms a plane joint surface for connection to the power supply container 3, and the heat generated by the LED module 8 is efficiently generated from the heat radiating fins 40 on the upper surface 10A. Heat can be dissipated.
Furthermore, in this embodiment, since each edge part 40B of the radiation fin 40 was set as the structure connected with the outer peripheral surface 30B of the convex-shaped part 30, the intensity | strength of the said convex-shaped part 30 is reinforced. Thereby, the explosion-proof performance of the light source container 2 is not lowered by the formation of the convex portion 30.

  Further, according to the present embodiment, the light source container 2 is formed with the opening 16 in which the step portion 18 into which the edge portion 17 of the translucent member 11 is fitted is formed, and the end portion 40 </ b> A of the radiating fin 40 corresponds to the step portion 18. It was set as the structure extended to the position to do. Thereby, the strength reduction by the step part 18 will be reinforced, and the explosion-proof performance of the light source container 2 will be improved.

  Moreover, according to this embodiment, it was set as the structure with which the explosion-proof type lighting fixture 1 was equipped with the terminal box 4 of the explosion-proof structure. Thereby, it becomes possible on the standard to install and use the explosion-proof luminaire 1 in the existing position box 5.

  In addition, according to the present embodiment, since the annular portion 20 that is the flange of the guard 12 is planarly joined to the light source container main body 10 and fastened by the plurality of bolts 21, the guard 12 is secured with sufficient strength. It can be fixed to the main body 10. In particular, since the translucent member 11 is sandwiched between the guard 12 and the light source container main body 10, the explosion-proof performance of the light source container 2 is enhanced.

  The above-described embodiments are merely illustrative of one aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.

  In the above-described embodiment, each of the light source container 2, the power supply container 3, and the terminal box 4 is configured to have the explosion-proof container by planar joining and bolt fastening. The container which has can be used.

  Moreover, in embodiment mentioned above, although the direct suspension type was illustrated as an installation state of the flameproof explosion-proof type lighting fixture 1, it is not restricted to this. For example, a so-called pipe suspension type that connects the explosion-proof luminaire 1 to a pipe suspended from the position box 5 on the ceiling surface, a so-called bracket type that connects the explosion-proof luminaire 1 to a bracket provided on a wall surface, etc. Arbitrary installation conditions can be adopted.

  Moreover, in embodiment mentioned above, although COB type LED8A was illustrated as an example of a light emitting element, not only this but arbitrary light emitting elements can be used for a light source. Moreover, although the bolts 67 and 76 were illustrated as a fastening metal fitting which fastens a plane joining location, arbitrary fastening metal fittings can be used as long as desired explosion-proof performance is obtained.

DESCRIPTION OF SYMBOLS 1 Explosion-proof type lighting fixture 2 Light source container 3 Power supply container 4 Terminal box 5 Terminal box 8 LED module 8A COB type LED (light emitting element)
9 Power supply circuit 11 Translucent member 12 Guard 16 Opening 17 Edge 18 Step part 20 Ring part (flange)
30 Convex part 30B Outer peripheral surface 40 Radiation fin 40A, 40B End part 21, 67, 76 Bolt (fastening metal fitting)

Claims (5)

A pressure-proof explosion-proof light source container containing a light-emitting element, and a pressure-proof explosion-proof power supply container containing a power circuit of the light-emitting element,
At the center of the upper surface of the light source container, a convex portion having a circular shape in a plan view that constitutes a flat joint surface with the power supply container is provided,
At the center of the lower surface of the power supply container, a convex portion having a circular shape in a bottom view that constitutes a flat joint surface with the light source container is provided,
In the center of the circular convex portion in plan view and the center of the circular convex portion in the bottom view, a wiring through-hole is provided through which an electric wiring extending from the power supply container and introduced into the light source container passes.
The electric wiring is passed through each of the wiring through-holes, the convex portion having a circular shape in a plan view and the convex portion having a circular shape in a bottom view are joined in a plane, and are fastened with a plurality of fasteners . A flameproof explosion-proof container-to-container connection structure having a predetermined pressure resistance performance is configured, and a desired explosion-proof flammability performance is ensured by the distance from the opening forming the wiring through hole in the joint surface to the outside. Explosion-proof lighting fixtures that are characterized. A plurality of heat radiation fins that radiate heat of the light emitting element are provided radially on the upper surface of the light source container around the circular convex portion in plan view ,
The flameproof explosion-proof luminaire according to claim 1, wherein each end portion of the radiating fin is connected to an outer peripheral surface of a circular convex portion in plan view . The light source container is formed with an opening in which a step portion into which an edge portion of a plate-like translucent member is fitted is formed,
The pressure-resistant explosion-proof lighting fixture according to claim 2, wherein the heat radiation fin extends on the upper surface of the light source container to a position corresponding to the stepped portion.   The light source container includes a light source container main body in which the opening is formed, and a guard provided in the opening of the light source container main body, the guard is plane-joined to the opening, and the translucent member is connected to the opening. The explosion-proof explosion-proof luminaire according to claim 3, further comprising a flange that is sandwiched between and fastened by a plurality of fasteners.   The explosion-proof explosion-proof luminaire according to any one of claims 1 to 4, wherein a terminal box having a flame-proof structure is integrally provided.

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