JP6834203B2 - Explosion-proof lighting equipment - Google Patents

Description

The present invention relates to an explosion-proof luminaire.

Conventionally, an explosion-proof luminaire having an LED as a light source and having an explosion-proof structure is known (see, for example, Patent Document 1). Further, as an alternative to the straight tube fluorescent lamp, an explosion-proof lighting fixture using a straight tube LED as a light source is also known (see, for example, Patent Document 2).

By the way, as described in Patent Document 1, there are two explosion-proof structures, a pressure-resistant explosion-proof structure and a safety-enhanced explosion-proof structure.
The flameproof structure withstands the explosive atmosphere that has entered the container of the lighting fixture without being damaged even if it explodes inside, and through all the joints or structural openings of the container, it creates an external explosive atmosphere. It is a structure that can prevent ignition.
The safety-enhanced explosion-proof structure is a structure applied to luminaires that do not generate arcs or sparks during normal use, and is resistant to abnormal arcs and sparks, and the possibility of excessive temperature rise. It is a structure in which measures have been taken to increase safety.

JP-A-2010-44872

Design Registration No. 1409078

Since the flameproof structure is required to be robust to the container, the shape of the luminaire increases, the weight increases, and the cost increases. On the other hand, in the safety-enhanced explosion-proof structure, the requirements for the strength of the container are not as strict as the pressure-resistant explosion-proof structure, so that the container can be made smaller and lighter. realizable.
As described above, in the explosion-proof luminaire having the LED as the light source and having the explosion-proof structure, it is difficult to reduce the size and weight of the explosion-proof luminaire having the explosion-proof structure as the explosion-proof structure.

In particular, in a pressure-resistant explosion-proof luminaire using a straight-tube LED as a light source instead of a straight-tube fluorescent lamp, since the container is long in one direction, the internal volume of the container is large, and it becomes more difficult to reduce the size and weight. Further, as the internal volume of the container is large, the explosive force when the explosive atmosphere explodes inside also increases, so that it is necessary to further increase the pressure resistance of the container, and it becomes difficult to reduce the size and weight.

An object of the present invention is to provide an explosion-proof luminaire that can be made smaller and lighter while having a long shape in one direction.

The present invention is a pressure-resistant explosion-proof lighting fixture comprising a rectangular plate-shaped light-emitting element substrate in which light-emitting elements are arranged in a row and an instrument body extending in one direction and accommodating the light-emitting element substrate. A light source accommodating recess which is a recess for accommodating the light emitting element substrate, a transparent flat plate-shaped cover for closing the light source accommodating recess, and a power supply box containing a power supply circuit for supplying power to the light emitting element substrate . The power supply box has a substantially rectangular shape, and a power supply accommodating recess for accommodating the power supply box is provided on the bottom surface of the light source accommodating recess, and the power accommodating recess has a cross section perpendicular to the direction in which the instrument body extends. The inside shape is substantially rectangular, and the dimensions of the rectangle are substantially equal to the cross-sectional dimensions of the power supply box.

The present invention is characterized in that, in the flameproof lighting fixture, the power supply box has a shape lacking corners in a cross section perpendicular to the direction in which the fixture body extends.

According to the present invention, an explosion-proof luminaire that can be made smaller and lighter can be obtained.

It is a figure which shows the installation state of the pressure-resistant explosion-proof luminaire which concerns on embodiment of this invention. It is a figure which shows the structure of the explosion-proof luminaire, (A) is a front view, (B) is a plan view, (C) is a bottom view, (D) is a left side view. It is an exploded perspective view of the explosion-proof luminaire. It is sectional drawing in the IV-IV cross-sectional line of FIG. It is a perspective view which looked at the instrument body together with a cable ground from above. It is a bottom view of the instrument body. 2 is a cross-sectional view taken along the line VII-VII of FIG. 2B. 2 is a cross-sectional view taken along the line VIII-VIII of FIG. 2B. It is a perspective view which looked at the flameproof luminaire which concerns on the modification of this invention from above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an installation state of the flameproof lighting fixture 1 according to the present embodiment.
As shown in FIG. 1, the flameproof luminaire 1 has a substantially rectangular shape extending in one direction K, and both ends thereof are connected to a pair of fixtures 2A and 2B. These fixtures 2A and 2B are members fixed to an installation surface such as a ceiling surface, and the flameproof luminaire 1 is supported by the pair of fixtures 2A and 2B and hung from the installation surface. Installed in a state.

The fixture 2A has a terminal box 4 fixed to the installation surface, and the pressure-resistant explosion-proof luminaire 1 is coupled to and supported by the terminal box 4. An electric wire cable for transmitting electric power is laid on the installation surface, and the electric wire cable is connected in the terminal box 4.
As shown in FIG. 1, the flameproof luminaire 1 includes a cable gland 6 coupled to the terminal box 4, and the electric wire cable extending from the flameproof luminaire 1 is drawn into the terminal box 4 through the cable gland 6. .. A pressure-resistant explosion-proof type cable gland 6 is used.

The bottom surface 1A of the flameproof luminaire 1 is provided with a translucent flat plate-shaped cover 8 and a guard 9 that protects the cover 8 from collisions with objects and the like. In the following, the configuration of the flameproof lighting fixture 1 will be described with the guard 9 removed.

2A and 2B are views showing the configuration of the flameproof luminaire 1, FIG. 2A is a front view, FIG. 2B is a plan view, FIG. 2C is a bottom view, and FIG. 2D is a bottom view. It is a left side view. FIG. 3 is an exploded perspective view of the flameproof lighting fixture 1. Further, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG.
The flameproof lighting fixture 1 includes a fixture main body 10, the above-mentioned cable gland 6, a cover 8, and a cover frame 12 that presses the cover 8 against the fixture main body 10.

FIG. 5 is a perspective view of the instrument body 10 as viewed from above together with the cable gland 6, and FIG. 6 is a bottom view of the instrument body 10.
As shown in FIG. 2B, the instrument main body 10 is formed in a rectangular shape having a width W of 97 mm and a length L of 850 mm in a plan view.
The length L of the fixture body 10 is a length that can be attached to fixtures 2A and 2B that have already been installed in accordance with the flameproof lighting fixture that uses a straight tube fluorescent lamp as a light source. Specifically, the fixtures 2A and 2B are separated by a distance of about 800 mm according to the total length of the flameproof luminaire equipped with a straight tube fluorescent lamp as a light source. Therefore, the length L of the instrument body 10 is set to 850 mm, which is larger than the separation distance between the fixtures 2A and 2B, and the upper surface 10B of the instrument body 10 is about, as shown in FIG. 2 (B). A cable gland 6 and a connecting portion 15 to the fixture 2B are provided at positions separated by a distance Lb of 800 mm. The distance Lb between the cable ground 6 and the fixture 2B is merely an example, and may be changed according to the separation distance between the fixtures 2A and 2B that are symmetrical to be installed. For example, the distance Lb may be 500 mm or 300 mm.

As shown in FIG. 3, a housing recess 20 is formed on the bottom surface 10A of the instrument body 10, and a plurality of (three in the illustrated example) LED substrates 16 and a power supply box 18 are formed in the housing recess 20. It is contained.

The LED substrate 16 includes a rectangular plate-shaped mounting substrate 19 having a width Wc of 30 mm and a length Lc of 243 mm, and a large number of LED elements 21 arranged in a row.
An SMD (Surface Mount Device) type LED chip is used for the LED element 21. The LED element 21 emits white light obtained by mixing the synchrotron radiation of the LED and the fluorescence generated by the synchrotron radiation, and a phosphor for obtaining the fluorescence is provided on the chip surface. Then, by arranging the LED elements 21 in a row on the LED substrate 16, colored light is linearly emitted from the LED substrate 16.

In the pressure-resistant explosion-proof luminaire 1, in order to enable an alternative to the above-mentioned pressure-resistant explosion-proof luminaire using a straight-tube fluorescent lamp as a light source, a number of LED substrates 16 corresponding to the total length of the straight-tube fluorescent lamp are provided in the longitudinal direction. It is connected. Further, the output of the LED element 21 and the number of the LED elements 21 are designed so that at least the light output of the straight tube fluorescent lamp or more can be obtained by these LED substrates 16.

In this design, the junction temperature of the LED element 21 is suppressed to a predetermined temperature T or less. The predetermined temperature T is a temperature at which a luminous efficiency of a predetermined value Q or more can be obtained in a correlation between the junction temperature and the luminous efficiency of the LED element 21.
In this flameproof luminaire 1, the junction temperature is lowered by suppressing the individual light output of the LED element 21, and the luminous efficiency of a predetermined value Q or more is maintained. However, in this case, since the absolute value of the luminous flux of the LED element 21 is small even if the luminous efficiency is increased, the number of the LED elements 21 can secure at least the light output of the straight tube type fluorescent lamp. It is more than a few.

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 2 (B).
As shown in the figure, the bottom surface 10A of the instrument body 10 is flat, and a fitting recess 26, which is a recess into which the cover 8 is fitted, is formed in the bottom surface 10A. The depth Da of the fitting recess 26 substantially coincides with the thickness of the cover 8, and when the cover 8 is fitted in the fitting recess 26, the surface 8A of the cover 8 and the bottom surface 10A of the instrument body 10 Are located on the same plane.
In this state, the cover 8 is fixed to the instrument body 10 by the cover frame 12 so as not to fall off. The cover frame 12 is a substantially rectangular plate-shaped frame that comes into surface contact with the bottom surface 10A of the instrument body 10, and the edge 8D of the cover 8 is pressed and fixed to the instrument body 10 by the cover frame 12. At this time, a packing 29 is provided between the edge 8D on the entire circumference of the cover 8 and the fitting recess 26 to improve airtightness and watertightness.
Further, the contact surface 27 between the fitting recess 26 of the instrument body 10 and the cover 8 serves as an explosion-proof surface, and the contact surface 27 has a width E corresponding to a predetermined pressure-resistant explosion-proof performance.

In the instrument main body 10, the accommodating recess 20 is formed in the fitting recess 26, and the accommodating recess 20 is a recess for accommodating the LED substrate 16 as shown in FIGS. 4 and 6. The recess 22 and the power storage recess 24, which is a recess for accommodating the power box 18, are included.

The instrument body 10 is formed by die-casting using a high thermal conductive material such as an aluminum alloy as a material. That is, as shown in FIG. 5, the upper surface 10B of the instrument main body 10 is formed with a first bulging portion 62 formed by the light source accommodating recess 22 of the accommodating recess 20 and a second bulging portion 64 formed by the power accommodating recess 24. ing.

Further, the upper surface 10B of the instrument body 10 is provided with a first fin 70 extending in the major axis direction of the instrument body 10 and a large number of second fins 72 extending in a direction perpendicular to the major axis direction. As shown in FIG. 2B, the first fin 70 is provided between both ends of the instrument main body 10, and the second fin 72 is provided so as to intersect the first fin 70.
The heat of the LED substrate 16 and the power supply box 18 housed in the accommodating recess 20 is dissipated from the first fin 70 and the second fin 72.

As shown in FIG. 7, the light source accommodating recess 22 is a recess having a substantially rectangular shape in a cross section perpendicular to the direction in which the instrument body 10 extends (hereinafter, referred to as the “major axis direction”). .. The LED substrate 16 is fixed to the flat bottom surface 22A of the light source accommodating recess 22 by a screw 30 (FIG. 3), and the open portion facing the LED substrate 16 is closed by a flat plate-shaped cover 8.

Here, the pressure-resistant explosion-proof luminaire 1 accommodates this light source as compared with a conventional pressure-resistant explosion-proof luminaire (hereinafter, simply referred to as "conventional equipment") provided with a straight-tube LED light source instead of a straight-tube fluorescent lamp. By keeping the volume of the recess 22 small, the explosive force when the explosive atmosphere explodes inside is suppressed.

More specifically, in the instrument main body 10, a substantially rectangular space having a depth D and a width Wd is formed by the light source accommodating recess 22 and the cover 8, and the LED substrate 16 is housed in this space. ing.
In general, most of the conventional appliances have a curved shape so that the inner surface of the cover bulges outward. Therefore, the space formed by the light source accommodating recess 22 and the cover 8 is larger than that of the conventional appliance. Since the inner surface 8A of the above surface is flat, the volume can be suppressed.

However, the distance between the LED substrate 16 and the inner surface 8A of the cover 8 of the fixture body 10 is narrower than that of the conventional fixture. Therefore, in the LED substrate 16 and the LED element 21, the LED junction temperature is likely to rise due to the reflected light reflected by the back surface reflection of the cover 8 as compared with the conventional fixture, and if no measures are taken, the luminous efficiency of the LED element 21 Is reduced, and the life of the LED element 21 is also shortened.
Therefore, in the flameproof lighting fixture 1, the depth D of the light source accommodating recess 22 is set to a size such that the LED junction temperature does not rise at least due to the reflected light reflected from the back surface of the cover 8.

On the other hand, in the flameproof lighting fixture 1, the LED substrate 16 is fixed to the bottom surface 10A of the light source accommodating recess 22 by a screw 30 to prevent the LED substrate 16 from falling off when vibration or impact is generated. However, when the pressure-resistant explosion-proof luminaire 1 is vibrated or shocked, the inner surface 8A of the cover 8 is also vibrated. In particular, since the cover 8 has a flat plate shape, the amplitude at the time of vibration is larger than that of the cover of the conventional instrument having a curved cross section. In this case, as shown in FIG. 4, if the gap δ between the head 30A of the screw 30 and the inner surface 8A of the cover 8 is too small, the inner surface 8A comes into contact with the head 30A of the screw 30 when the cover 8 vibrates. However, the cover 8 may be scratched or damaged.
Therefore, in the flameproof lighting fixture 1, the depth D of the light source accommodating recess 22 is set so that the gap δ is equal to or more than the amplitude of the cover 8 during vibration.

As described above, the depth D of the light source accommodating recess 22 is such that the LED junction temperature does not rise due to the reflected light reflected from the back surface of the cover 8, and the head 30A of the screw 30 for fixing the LED substrate 16 and the cover. By making the gap δ between the inner surfaces 8A of 8 equal to or more than the vibration amplitude of the cover 8, the decrease in luminous efficiency and life is suppressed, and the damage during vibration is prevented. ..
Further, the size of the depth D of the light source accommodating recess 22 is the minimum value D1 of the size at which the LED junction temperature does not rise due to the reflected light reflected from the back surface of the cover 8, and the head 30A of the screw 30 for fixing the LED substrate 16. The volume of the light source accommodating recess 22 is set to be about the larger of the minimum values D2 of the size that makes the gap δ between the inner surface 8A of the cover 8 and the inner surface 8A of the cover 8 equal to or more than the amplitude of the cover 8 during vibration. Is effectively suppressed. In this embodiment, the depth D is 12 mm.

On the other hand, the volume of the light source accommodating recess 22 can be suppressed by reducing the value of the width Wd of the light source accommodating recess 22. In the LED substrate 16 of the present embodiment, the number of arrangements of the LED elements 21 in the width Wc is limited to one row, so that the width Wc of the LED substrate 16 and the width of the light source accommodating recess 22 for accommodating the LED substrate 16 The value of Wd can be minimized.
However, as the width Wd becomes smaller, the inner wall surface 22B of the light source accommodating recess 22 approaches the LED substrate 16 (LED element 21), and the synchrotron radiation of the LED substrate 16 (LED element 21) may be shielded.
Therefore, in the pressure-resistant explosion-proof luminaire 1, the width Wd of the light source accommodating recess 22 is such that the inner wall surface 22B having a depth D is located outside the radiation range θ of the synchrotron radiation radiated from the LED substrate 16 (LED element 21). (In this embodiment, it is a substantially minimum value of this value).
As a result, the volume can be suppressed while suppressing the shielding of the synchrotron radiation by the light source accommodating recess 22. In this embodiment, the width Wd is 50 mm.

FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. 2 (B).
In the accommodating recess 20, the power accommodating recess 24 is formed by a recess provided in a part of the bottom surface 22A of the light source accommodating recess 22, as shown in FIGS. 3, 4, 6, and 8.
As shown in FIGS. 3, 4, and 8, the power supply box 18 includes a box body 50 having a substantially rectangular parallelepiped shape that is long in the long axis direction of the device body 10. The box body 50 has a built-in power supply circuit that supplies electric power to the LED board 16, and terminal portions 52 to which electric wires and cables are connected are provided at both ends of the box body 50 in the long axis direction. There is.
As shown in FIG. 8, the width We of the box body 50 is made smaller than the width Wd of the light source accommodating recess 22.

The power supply accommodating recess 24 is provided on the bottom surface 22A of the light source accommodating recess 22 in parallel with the light source accommodating recess 22 from the end on the side of the cable ground 6 of the instrument main body 10. As shown in FIGS. 3 and 8, a partition plate 40 for partitioning the light source accommodating recess 22 and the power supply accommodating recess 24 is provided. By providing the partition plate 40 with the upper surface 40A positioned at the position of the depth D, the upper surface 40A and the bottom surface 22A of the light source accommodating recess 22 are located on the same surface, and the LED substrate is formed on the upper surface 40A. 16 is arranged and fixed by a screw 30.

As shown in FIG. 3, bent portions 40C having a vertically bent shape are formed at both ends of the partition plate 40 in the width direction. Since the partition plate 40 includes the bent portion 40C, the bending rigidity of the partition plate 40 can be increased even if the thickness of the central portion in the width direction of the partition plate 40 is reduced. As a result, the deformation of the partition plate 40 is suppressed even when an explosion occurs starting from the inside of the power supply accommodating recess 24, and the head 30A of the screw 30 and the cover 8 for fixing the LED substrate 16 due to the deformation of the partition plate 40 There is no contact with the inner surface 8A.

As shown in FIG. 8, the power supply accommodating recess 24 is formed so that the width We is about the same as the width of the box body 50 of the power supply box 18. Further, the depth Db from the back surface 40B of the partition plate 40 to the bottom surface 24A of the power supply accommodating recess 24 is also formed to be approximately the same as the height of the box body 50 of the power supply box 18.
That is, the power supply accommodating recess 24 has a substantially rectangular shape in a cross section perpendicular to the long axis direction, and the rectangular dimension thereof is substantially equal to the dimension of the box body 50 of the power supply box 18. Has been done. As a result, the gaps between the inner surface 24B of the power supply accommodating recess 24 and the outer surface 50B of the box body 50 and between the back surface 40B of the partition plate 40 and the upper surface 50A of the box body 50 are suppressed to about the dimensional tolerance. Therefore, the volume of the power supply accommodating recess 24 is suppressed.

On the other hand, in the cross section including the major axis direction, the power supply accommodating recess 24 is for connecting the electric wire cable to the terminal portion 52 and fixing the power supply box 18 to the bottom surface 24A of the power accommodating recess 24 by screwing, as shown in FIG. Space 25 is included on both ends of the power supply box 18.
Here, an electric wire cable extending to the cable ground 6 is connected to one terminal portion 52, and the other terminal portion 52 is provided on the LED substrate 16 on the end side of the instrument main body 10 in order to supply power to the LED element 21. It is connected to the connector. Therefore, regardless of which terminal portion 52 is on the input side, the electric wire cable passes between the terminal portion 52 on the side of the two terminal portions 52 located far from the cable ground 6 and the end portion of the instrument main body 10. It will be.
However, if a space for arranging the electric wire cable is provided in the power supply accommodating recess 24, the volume of the power accommodating recess 24 increases accordingly. Therefore, in the flameproof luminaire 1, as shown in FIG. 8, the box body 50 of the power supply box 18 has a shape in which the corners of the rectangular corners 50K are chamfered in a cross section perpendicular to the long axis direction. (That is, the shape of the corner portion 50K lacking the corner) is formed.
As a result, a wiring space 54 for passing the electric wire cable is provided in the corner portion 50K of the box main body 50 without increasing the volume of the power supply accommodating recess 24.
The shape of the corner 50K is not limited to the shape shown in the illustrated example, and may be any shape such as a concave cross section as long as the corner of the corner 50K is missing and the wiring space 54 is provided.

In this way, the cross-sectional dimension of the power supply accommodating recess 24 is made substantially equal to the cross-sectional dimension of the power supply box 18, so that only a gap of about a dimensional tolerance is provided between the outer surface 50B and the upper surface 50A of the power supply box 18. It is made not to be. As a result, the volume of the power supply accommodating recess 24 is suppressed.
Further, since the box body 50 of the power supply box 18 is provided with a wiring space 54 through which the electric wire cable is passed by forming the corner portion 50K in a concave shape, the volume of the power supply accommodating recess 24 is increased by the wiring space 54. There is nothing to do.
Further, as described above, since the volume of the light source accommodating recess 22 is also suppressed, the volume of the accommodating recess 20 including the light source accommodating recess 22 and the power supply accommodating recess 24 is also suppressed small. By reducing the volume of the accommodating recess in this way, it is possible to reduce the size and weight of the instrument main body 10.

Further, in general, as the volume of the instrument body 10 becomes smaller, the explosive force when the explosive atmosphere explodes inside is also suppressed, so that the pressure resistance of the instrument body 10 can be lowered, and further miniaturization and weight reduction become possible. ..
For example, in the flameproof luminaire 1, a resin material lighter than the glass material is used as the material of the cover 8 instead of the glass material generally used as the cover of the flameproof luminaire. Even if is used, sufficient pressure-resistant explosion-proof performance is maintained. In addition, the resin material is generally superior in impact resistance to the glass material, and the plate thickness can be made thinner than the glass material cover. For example, the thickness of the cover 8 of this embodiment is 3 mm. Even if the luminaire is larger than this, the thickness of the cover 8 can be suppressed to 5 mm or less.
When the guard 9 that protects the cover 8 is not attached to the flameproof luminaire 1, the material of the cover 8 may be glass in order to improve the collision resistance with the cover 8. Further, the thickness of the cover 8 can be increased to improve the impact resistance of the cover 8.

As described above, in the present embodiment, the light source accommodating recess 22 and the cover 8 of the instrument main body 10 have a predetermined depth D and a predetermined shape in a cross section perpendicular to the long axis direction of the LED substrate 16. The structure is such that a substantially rectangular space having a width Wd is formed.
As a result, the volume of the space consisting of the light source accommodating recess 22 and the cover 8 can be suppressed as compared with the conventional device having a curved shape so that the inner surface of the cover bulges outward, resulting in miniaturization, weight reduction, and low cost. Can be converted. Further, since the explosive force when the explosive atmosphere explodes inside is suppressed, the withstand voltage of the instrument main body 10 can be lowered, and further miniaturization, weight reduction, and cost reduction are possible.

Further, in the present embodiment, the depth D of the light source accommodating recess 22 is set to a size such that the junction temperature of the LED element 21 does not rise due to the reflected light reflected from the back surface of the cover 8.
As a result, it is possible to prevent a decrease in the luminous efficiency of the LED element 21 due to an increase in the LED junction temperature and a shortening of the life of the LED element 21.

Further, in the present embodiment, the LED substrate 16 is fixed to the light source accommodating recess 22 by the screw 30, and the depth D covers the gap δ between the head 30A of the screw 30 and the inner surface 8A of the cover 8. The size was set to be equal to or greater than the amplitude at the time of vibration.
As a result, it is possible to prevent the cover 8 from being damaged by the vibration of the cover 8 due to the impact or vibration of the flameproof luminaire 1.

Further, in the present embodiment, the width Wd of the light source accommodating recess 22 is set to a size such that the inner wall surface 22B of the light source accommodating recess 22 is located outside the radiation range θ of the synchrotron radiation from the LED substrate 16.
As a result, shielding of synchrotron radiation by the light source accommodating recess 22 is suppressed, and a decrease in efficiency is suppressed.

Further, in the present embodiment, the power supply accommodating recess 24 has a substantially rectangular shape in a cross section perpendicular to the direction in which the instrument body 10 extends (long axis direction), and the rectangular dimension is substantially the cross-sectional dimension of the power supply box 18. It is made equal.
As a result, even when the power supply box 18 is built in the instrument main body 10, the volume of the power supply accommodating recess 24 can be suppressed.

Further, in the present embodiment, the power supply box 18 is formed in a shape lacking a corner of a corner portion 50K in a cross section perpendicular to the direction in which the instrument main body 10 extends.
As a result, the corner portion 50K can be used as the wiring space 54 of the power supply box 18, and the wiring space 54 does not increase the volume of the power supply accommodating recess 24.

It should be noted that the above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the gist of the present invention.

For example, in the above-described embodiment, the flameproof lighting fixture 1 having a built-in power supply box 18 has been illustrated, but the present invention is not limited to this. That is, by mounting a circuit for generating DC LED drive power from commercial power on the LED substrate 16, the power supply box 18 and the power supply accommodating recess 24 are unnecessary, and the volume of the appliance main body 10 can be further reduced. In this case, as in the flameproof lighting fixture 100 shown in FIG. 9, the upper surface 100B of the fixture main body 110 does not have the second bulging portion 64 due to the power supply accommodating recess 24, which further reduces the size, weight, and cost. Can be realized.

Further, in the above-described embodiment, the LED element 21 has been illustrated as an example of the light emitting element, but the present invention is not limited to this, and any light emitting element such as an organic EL can be used.

1,100 Explosion-proof lighting fixture 6 Cable ground 8 Cover 8A Inner surface 10, 110 Fixture body 12 Cover frame 16 LED board (light emitting element board)
18 Power supply box 20 Containment recess 21 LED element (light emitting element)
22 Light source accommodating recess 22B Inner wall surface 24 Power accommodating recess 30 Screw 30A Head 50 Box body 50K Corner 54 Wiring space D Depth Wd Width

Claims (2)

A rectangular plate-shaped light emitting element substrate in which light emitting elements are arranged in a row,
An instrument body that extends in one direction and houses the light emitting element substrate,
In flameproof lighting fixtures equipped with
The instrument body
A light source accommodating recess, which is a recess accommodating the light emitting element substrate,
A translucent flat cover that closes the light source accommodating recess,
A power supply box containing a power supply circuit for supplying electric power to the light emitting element substrate is provided.
The power supply box has a substantially rectangular parallelepiped shape.
A power supply accommodating recess for accommodating the power box is provided on the bottom surface of the light source accommodating recess.
The power storage recess is
A pressure-resistant explosion-proof luminaire characterized in that the shape in a cross section perpendicular to the direction in which the fixture body extends is substantially rectangular, and the dimensions of the rectangle are substantially equal to the cross-sectional dimensions of the power supply box. The pressure-resistant explosion-proof luminaire according to claim 1 , wherein the power supply box is formed in a shape lacking corners in a cross section perpendicular to the direction in which the fixture body extends.

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