JP6887898B2 - Flame detector - Google Patents

Description

The present invention relates to a flame detector.

In order to detect a fire at an early stage, flame detectors that detect the occurrence of flames will be installed inside and outside the building. In general, flame detectors are often installed not only indoors but also outdoors under eaves, so it was necessary to take waterproof measures to prevent rainwater from entering the inside of the equipment. Here, in the waterproof sensor described in Patent Document 1, a waterproof housing is provided inside the cover, and an electric circuit or the like is housed inside the waterproof housing.

Japanese Unexamined Patent Publication No. 2016-095617

However, the waterproof sensor of Patent Document 1 has a problem that the weight of the whole becomes heavier because it has a waterproof housing inside. In addition, it is difficult to reduce the size because it is necessary to provide a space for providing the waterproof housing inside the cover. Furthermore, since a member for assembling the waterproof housing inside the waterproof sensor is also required, the number of parts has increased.

The present invention has been made to solve such a problem, and to provide a flame detector which has a waterproof function, reduces the number of parts, and can achieve weight reduction and miniaturization of the entire device. The purpose.

In order to solve the above problems, the flame detector according to the present invention is formed in a light receiving element for detecting the light emitted from the flame, a case for accommodating the light receiving element inside, and a light receiving element. A light receiving opening provided opposite to the light receiving opening and a window member provided by closing the light receiving opening are provided, and the space between the window member and the case is sealed by a waterproof double-sided tape that adheres to the window member and the case, and the light receiving element A lead wire is connected to the lead wire, and the lead wire extends to the outside of the case through a lead wire opening provided in the case. A resin member is integrally attached to the lead wire, and the resin member is the case. It is provided in a state of being press-fitted into the lead wire opening of the above, and seals between the lead wire opening and the lead wire.

Further, the flame detector according to the present invention is formed in a light receiving element for detecting light emitted from a flame, a case for accommodating the light receiving element inside, and a light receiving element provided in the case and facing the light receiving element. It is provided with an opening and a window member provided by closing the light receiving opening, and the window member and the case are sealed by a waterproof double-sided tape that adheres to the window member and the case, and the case is provided with an opening on one side. It has a first cover that is a box and a second cover that is fitted into the opening of the first cover. A step portion is provided on the inner peripheral surface of the first cover, and the outer peripheral portion of the second cover A gasket is provided between the stepped portion and the stepped portion, and at least one drain hole communicating with the outside of the case is formed on the stepped portion of the first cover outside the contact position with the gasket.

Further, the flame detector according to the present invention includes a light receiving element that senses light emitted from a flame, a case that houses the light receiving element inside, and a light receiving element that is formed in the case and is provided so as to face the light receiving element. It is provided with an opening and a window member provided by closing the light receiving opening, and the space between the window member and the case is sealed by a waterproof double-sided tape that adheres to the window member and the case, and is housed inside the case for inspection. It is further provided with a light emitting element and a reflector which is attached to the peripheral edge of the light receiving opening and is provided so as to face the inspection light emitting element and can reflect the light of the inspection light emitting element and make it incident on the light receiving element. The case has a first cover, which is a box having an opening on one side, the first cover has a reflector mounting groove on the peripheral edge of the light receiving opening on the inner side, and the reflector has a radial outer portion thereof. It fits into the reflector mounting groove so that it is flush with the inner surface of the first cover, and the waterproof double-sided tape adheres to the window member, case and reflector, and the radial outer part of the first cover and reflector and the window. It is sandwiched between the members.

The case has a first cover, which is a box body having an opening on one side, and a second cover fitted to the opening of the first cover, and a step portion is provided on the inner peripheral surface of the first cover. At the same time, a gasket is provided between the outer peripheral portion of the second cover and the stepped portion, and the stepped portion of the first cover communicates with at least the outside of the contact position with the gasket to the outside of the case. One drain hole may be formed.

Further, at least one ramp may be formed on the outer surface of the second cover, which is inclined from the central portion of the second cover toward the outer peripheral portion in a direction in which the height becomes lower.

According to the flame detector according to the present invention, it is possible to have a waterproof function, reduce the number of parts, and achieve weight reduction and miniaturization of the entire device.

It is a perspective view of the flame detector which concerns on Embodiment 1 of this invention. It is a top view of the flame detector shown in FIG. It is a front view and the rear view of the flame detector shown in FIG. It is a right side view of the flame detector shown in FIG. It is a left side view of the flame detector shown in FIG. It is a bottom view of the flame detector shown in FIG. It is an exploded perspective view of the flame detector shown in FIG. It is an enlarged view which shows the shape of the vicinity of the corner of the first cover of the flame detector shown in FIG. FIG. 8 is an enlarged cross-sectional view of the vicinity of the corner of the first cover of the flame detector shown in FIG. 8 cut along the cutting line IX-IX. It is a perspective view of the flame detector shown in FIG. 1 as seen from the bottom surface side. FIG. 5 is a cross-sectional view of the flame detector shown in FIG. 1 cut along the cutting line XI-XI. FIG. 11 is an enlarged cross-sectional view of a contact portion between the glass plate of the flame detector and the reflector shown in FIG. It is a figure which shows the use example of the flame detector shown in FIG. 1, and is the figure which shows the appearance which the flame detector and the wiring box were combined and attached to the universal metal fitting. It is a figure which shows the use example of the flame detector shown in FIG. 1, and is the figure which shows the state which the flame detector was attached to the universal mounting base.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Note that FIG. 1 is a perspective view showing the appearance of the flame detector 100. Further, when FIG. 2 is a plan view of the flame detector 100, FIG. 3 is a front view and a rear view of the flame detector 100 as viewed from the front side F or the back side B. That is, the front view and the rear view of the flame detector 100 have the same shape. Further, FIG. 4 is a right side view of the flame detector 100 shown in FIG. 2 as viewed from the right side R, and FIG. 5 is a left side view of the flame detector 100 shown in FIG. 2 as viewed from the left side L. Further, FIG. 6 is a bottom view of the flame detector 100. Further, FIG. 7 is an exploded perspective view of the flame detector 100.

As shown in FIGS. 1 to 6, the flame detector 100 has a case 1 having a substantially rectangular parallelepiped shape. Here, as shown in FIG. 7, the case 1 has a first cover 10 which is a box and a second cover 20 which is fitted into an opening 10a formed in one of the first covers 10. Further, the side on which the second cover 20 is provided, that is, the bottom side of the flame detector 100, forms a mounting side T to be mounted on a building, a mounting bracket, or the like.

As shown in FIGS. 1 and 2, a top surface 10b, which is a circular plane, is formed in the central portion of the first cover 10. Further, as shown in FIGS. 3 to 5, each of the front side, the back side, the right side surface, and the left side surface of the first cover 10 has a substantially arcuate outer shape corresponding to the four sides of the first cover 10. The side plane 10c to have is formed. Further, a curved surface 10d is formed between the top surface 10b and the side plane 10c. Further, a substantially rectangular light receiving opening 17 is formed in the central portion of the top surface 10b of the first cover 10. Further, fixing member mounting holes 18 are formed at each of the four corners of the curved surface 10d of the first cover 10. As shown in FIG. 7, a step portion 10e is provided on the inner side of the first cover 10.

Then, as shown in FIGS. 8 and 9, two drain holes 19 are provided in the vicinity of the corner X of the step portion 10e with the respective fixing member mounting holes 18 sandwiched between them. That is, a total of eight drain holes 19 are formed in the stepped portion 10e of the first cover 10. As shown in FIG. 9, the drain hole 19 is provided outside the contact position between the step portion 10e and the gasket 30. Further, the drain hole 19 communicates with the outer side of the first cover 10 and is arranged adjacent to each of the side planes 10c.

Further, as shown in FIGS. 6 and 7, the second cover 20 is a substantially square plate. As shown in FIG. 7, the outer peripheral portion 20a of the second cover 20 engages with the stepped portion 10e of the first cover 10 via the gasket 30, so that the second cover 20 has a second with respect to the first cover 10. It is attached in a state of being fitted inside the opening 10a of the cover 10. Here, the gasket 30 is provided between the stepped portion 10e of the first cover 10 and the outer peripheral portion 20a of the second cover 20, and the space between the first cover 10 and the second cover 20 is hermetically sealed and waterproofed. It has a function. Further, as shown in FIGS. 7 and 10, the second cover 20 is attached to the first cover 10 via four fixing members 22. The fixing member 22 is inserted into the mounting hole 18a inside the fixing member mounting hole 18 of the first cover 10. Further, as shown in FIG. 6, an elongated lead wire opening 23 is formed in the central portion 20b of the second cover 20.

As shown in FIGS. 6, 7 and 10, four ramps 21 are formed on the surface of the mounting side T of the second cover 20, that is, the surface on the outer side. Here, as shown in FIG. 7, two of the four ramps 21 have lower heights from the central portion 20b of the second cover 20 toward the outer peripheral portion 20a on the right side of the paper surface. It is provided in a state of being inclined in the direction of Further, the other two ramps 21b are provided in a state of being inclined from the central portion 20b of the second cover 20 toward the outer peripheral portion 20a on the left side of the paper surface in the same direction so that the height becomes lower. .. Therefore, when the flame detector 100 is mounted on the ceiling or eaves of the building with the mounting side T facing up, the ramp 21 is provided so as to incline downward from the central portion 20b toward the outer peripheral portion 20a. Has been done.
The height of the ramp 21 refers to the thickness of the ramp 21 as measured with reference to the inner end 20c (see FIG. 11) of the second cover 20.

As shown in FIG. 11, the electronic substrate 11 is housed inside the case 1. Further, eight lead wires 41 are connected to the electronic board 11. The lead wire 41 penetrates the lead wire opening 23 of the second cover 20 and extends to the outside of the case 1. A resin member 42 is integrally attached to the eight lead wires 41. The resin member 42 is provided with a convex portion 42a that protrudes in the extension direction of the lead wire 41 and covers the periphery of the lead wire 41. Then, the convex portion 42a of the resin member 42 is press-fitted into the lead wire opening 23 of the second cover 20, so that the lead wire 41 is fixed to the case 1. Further, a tapered surface 42b is formed on the convex portion 42a of the resin member 42. Further, a tapered surface 23a is also formed inside the lead wire opening 23. Here, when the resin member 42 is attached to the lead wire opening 23, the tapered surface 42b of the resin member 42 abuts on the tapered surface 23a of the lead wire opening 23, so that the resin member 42 is more press-fitted into the lead wire opening 23. It is easy to fit. Further, in a state where the resin member 42 is press-fitted to the lead wire opening 23, the resin member 42 seals between the lead wire 41 and the lead wire opening 23 of the second cover 20. In the resin member 42 in the press-fitting state, the plate 45 provided on the front surface thereof is fixed to the second cover 20 by a fixing member (not shown) to prevent the fitting state from being eliminated and press-fitting. The total amount (crushing amount) is controlled.

Further, inside the case 1, a light receiving element 16 and a pair of inspection light emitting elements 15 provided with the light receiving element 16 sandwiched between them are housed. The light receiving element 16 and the inspection light emitting element 15 are connected to the electronic substrate 11. That is, the light receiving element 16 and the inspection light emitting element 15 are connected to the lead wire 41 via the electronic substrate 11. Here, the light receiving element 16 is arranged so as to face the light receiving opening 17 of the first cover 10. Further, the light receiving opening 17 is closed by a transparent glass plate 12 provided on the inner side of the first cover 10. The glass plate 12 is made of sapphire glass.
The glass plate 12 is an example of a window member.

Further, as shown in FIG. 12, a reflector mounting groove 17a is formed on the peripheral edge portion Y of the light receiving opening 17 on the inner side of the first cover 10. A ring-shaped reflector 14 is fitted and mounted in the reflector mounting groove 17a. An inclined surface 14a is provided inside the reflector 14 in the radial direction. The inclined surface 14a of the reflector 14 faces the light emitting element 15 for inspection. Further, in a state where the reflector 14 is fitted in the reflector mounting groove 17a, the outer portion 14b of the reflector 14 is provided so as to be flush with the inner surface of the first cover 10. The diameter of the glass plate 12 is larger than the outer diameter of the reflector 14. Further, a waterproof double-sided tape 13 is sandwiched between the outer portion 14b of the first cover 10 and the reflector 14 and the glass plate 12. The waterproof double-sided tape 13 fixes the reflector 14 and the glass plate 12 to the first cover 10 by adhering to the first cover 10, the reflector 14, and the glass plate 12. Further, the waterproof double-sided tape 13 is attached so as to seal between the first cover 10 and the glass plate 12. The waterproof double-sided tape 13 is an acrylic foam double-sided tape.

Next, the operation of the flame detector 100 will be described with reference to FIG.
First, when a flame is generated near the installation location of the flame detector 100, the light receiving element 16 senses the infrared light radiated from the flame through the light receiving opening 17 and the glass plate 12. Then, when the light receiving element 16 senses the generation of flame, the operation confirmation lamp (not shown) lights up.

Further, in order to confirm whether the light receiving element 16 can normally detect light and whether the glass plate 12 is not contaminated, the light emitting element 15 for inspection is periodically made to emit light. The light radiated from the inspection light emitting element 15 is reflected on the inclined surface 14a of the reflector 14 via the glass plate 12, and then again enters the light receiving element 16 via the glass plate 12. As a result, it is confirmed whether or not the flame detector 100 can normally detect the light of the inspection light emitting element 15 and whether or not the glass plate 12 is contaminated.

Next, an example of how to attach the flame detector 100 will be described with reference to FIGS. 13 and 14.
As shown in FIG. 13, when the flame detector 100 is attached to the wall of the building, the universal metal fitting 6 is used. Here, the wiring box 5 is attached to the attachment side T of the flame detector 100, and the lead wire 41 is housed in the wiring box 5. Therefore, the flame detector 100 is attached to the wall via the universal metal fitting 6 in a state of being combined with the wiring box 5. Further, the flame detector 100 can freely change its direction by adjusting the position of the member of the universal metal fitting 6 as shown by an arrow.

Further, as shown in FIG. 14, when mounting the flame detector 100 on the ceiling, under the eaves, or the like, the universal mounting base 7 is used. The flame detector 100 is attached to the building via the universal mounting base 7, and the orientation can be freely changed by appropriately adjusting the position of the member of the flexible mounting base 7 as in the universal metal fitting 6. ..

The method of attaching the flame detector 100 is not limited to the case where the flame detector 100 is attached to the building via the universal bracket 6 or the universal mounting base 7 as shown in FIGS. 13 and 14, and the flame detector 100 is directly attached to the building. You may.

From the above, in the flame detector 100 according to the first embodiment, the glass plate 12 which is a window member for closing the light receiving opening 17 and the first cover 10 are sealed by the waterproof double-sided tape 13. As a result, the space between the glass plate 12 and the first cover 10 can be reliably waterproofed without providing a waterproof member inside the case 1 of the flame detector 100. As a result, the weight and size of the flame detector 100 can be reduced. Further, since a fixing member for attaching the waterproof member to the case 1 is not required, the number of parts can be reduced.

Further, the double-sided tape 13 for waterproofing is provided between the first cover 10 and the reflector 14 and the glass plate 12, and the reflector 14 and the glass plate 12 are brought into close contact with the glass plate 12, the first cover 10 and the reflector 14. It can be fixed to the first cover 10. Therefore, it is not necessary to use fixing members such as bolts to fix the reflector 14 and the glass plate 12, so that the number of parts can be further reduced.

Further, by using the acrylic foam double-sided tape for the waterproof double-sided tape 13, the space between the glass plate 12 and the first cover 10 can be more reliably waterproofed, and the reflector 14 and the glass plate 12 can be covered with the first cover 10. Can be firmly fixed to.

Further, a resin member 42 is integrally attached to the lead wire 41, and the resin member 42 is press-fitted into the lead wire opening 23 and seals between the lead wire opening 23 and the lead wire 41. As a result, the space between the lead wire opening 23 and the lead wire 41 is waterproofed.
Further, conventionally, in order to waterproof the electronic board inside the waterproof sensor, a method of filling the entire electronic board with a filler has been adopted, but this method makes maintenance of the electronic board extremely difficult. It was. On the other hand, in the flame detector 100 according to this embodiment, since the resin member 42 having a waterproof function is attached to the second cover 20, only the second cover 20 is removed from the first cover 10 to generate electrons. The board 11 can be accessed, which facilitates maintenance.

Further, a step portion 10e is provided on the inner peripheral surface of the first cover 10, and a gasket 30 is provided between the outer peripheral portion 20a of the second cover 20 and the step portion 10e. Therefore, the gasket 30 waterproofs the space between the first cover 10 and the second cover 20. Further, in the step portion 10e, a drain hole 19 communicating with the outside of the case 1 is formed outside the contact position with the gasket 30. As a result, even when water such as rainwater enters the inside of the first cover 10, the water droplets are drained to the outside through the drain hole 19 as shown by the arrow in FIG.
The position of the drain hole 19 may partially overlap with the gasket 30, and it is sufficient that at least a part of each drain hole 19 is arranged outside the position where the gasket 30 is provided. ..

Further, on the outer surface of the second cover 20, a ramp 21 is formed which is inclined in a direction in which the height becomes lower from the central portion 20b of the second cover 20 toward the outer peripheral portion 20a. As a result, when the flame detector 100 is mounted on the ceiling or under the eaves with the mounting side T facing up, water droplets are guided along the ramp 21 to the outer peripheral portion 20a of the second cover 20, and the first cover 10 The water is drained to the outside from the drain hole 19 of the step portion 10e.

1 case, 10 first cover, 12 glass plate (window member), 13 waterproof double-sided tape, 15 light emitting element for inspection, 17 light receiving opening, 19 drain hole, 20 second cover, 20a outer peripheral part of second cover, 20b Central part of the second cover, 21,21a, 21b ramp, 23 lead wire opening, 30 gasket, 41 lead wire, 42 resin member, 100 flame detector, Y light receiving opening peripheral edge.

Claims (4)

A light receiving element that senses the light emitted from the flame,
A case for accommodating the light receiving element inside and
A light receiving opening formed in the case and provided facing the light receiving element,
It is provided with a window member provided by closing the light receiving opening.
The window member and the case are sealed by a waterproof double-sided tape that adheres to the window member and the case .
A lead wire is connected to the light receiving element, and the lead wire extends to the outside of the case through a lead wire opening provided in the case.
A resin member is integrally attached to the lead wire,
The resin member is provided in a state of being press-fitted into the lead wire opening of the case, and is a flame detector that seals between the lead wire opening and the lead wire. A light receiving element that senses the light emitted from the flame,
A case for accommodating the light receiving element inside and
A light receiving opening formed in the case and provided facing the light receiving element,
It is provided with a window member provided by closing the light receiving opening.
The window member and the case are sealed by a waterproof double-sided tape that adheres to the window member and the case .
The case is
The first cover, which is a box with an opening on one side,
It has a second cover that is fitted into the opening of the first cover.
A step portion is provided on the inner peripheral surface of the first cover, and a gasket is provided between the outer peripheral portion of the second cover and the step portion.
A flame detector in which at least one drain hole communicating with the outside of the case is formed on the stepped portion of the first cover outside the contact position with the gasket. Wherein the surface of the outer side of the second cover, toward the outer peripheral portion from the central portion of the second cover, according to claim 2 wherein at least one ramp height inclined in the direction of lower are formed Flame detector. A light receiving element that senses the light emitted from the flame,
A case for accommodating the light receiving element inside and
A light receiving opening formed in the case and provided facing the light receiving element,
It is provided with a window member provided by closing the light receiving opening.
The window member and the case are sealed by a waterproof double-sided tape that adheres to the window member and the case .
An inspection light emitting element housed inside the case and
It is further provided with a reflector which is attached to the peripheral edge of the light receiving opening and is provided so as to face the inspection light emitting element and can reflect the light of the inspection light emitting element and make it incident on the light receiving element.
The case has a first cover, which is a box body provided with the light receiving opening on the top surface.
The first cover has a reflector mounting groove on the peripheral edge of the light receiving opening on the inner side.
The reflector is fitted into the reflector mounting groove so that its radial outer portion is flush with the inner surface of the first cover.
The waterproof double-sided tape is a flame detector that is in close contact with the window member, the case, and the reflector, and is sandwiched between the first cover and the radial outer portion of the reflector and the window member.

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