JP2009211610A - Heat and smoke composite type fire sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of indicator lights by securing visibility of the indicator light from all directions. <P>SOLUTION: A heat and smoke composite type fire sensor includes: a printed circuit board 5 installed with a heat-sensitive element 1 detecting heat and a smoke detection part 3 detecting smoke flowing into a black box 2; a casing 6 storing the printed circuit board 5, projectively provided with a protection part 7 protecting the black box 2, and formed with an insertion hole 8 allowing insertion of a tip 1a of the heat-sensitive element 1; the indicator light 4 installed to the printed circuit board 5; a light guide insertion hole 9 formed in the casing 6 correspondingly to the indicator light 4; and light guide 12 having a tip projecting outward from the protection part 7, inserted in the light guide insertion hole 9 such that a base end 12b faces the indicator light 4 to engage with the casing 6, and made of a light guide material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a combined heat and smoke fire detector that includes a thermal element that detects heat, a smoke detection unit that detects smoke, and an indicator lamp, and detects and notifies a fire from smoke and ambient temperature.

  Conventionally, it is equipped with a heat sensitive element that detects heat, a smoke detector that detects smoke, and an indicator lamp that faces the opening of the housing and is placed inside the housing, and detects fire from ambient temperature and smoke to detect fire. There are known fire smoke combined type fire detectors that recognize fires by turning on indicator lamps. And in such a thing, the smoke detection part is protrudingly provided in the center of the housing, and a thermal element such as a thermistor is further stacked on the smoke detection part, and the thermistor is protected by a protector. Is generally adopted. However, in the case of this structure method, it is necessary to bend the wiring of the heat sensitive element so that the inside of the smoke detection unit is penetrated or the one detoured to the side of the smoke detection unit is located in the upper center. is there.

  Therefore, the base of the thermistor is positioned on the side of the dark box and attached to the printed circuit board in the housing. And what improved assembly property and maintenance property is proposed (for example, refer to patent documents 1).

Japanese Patent Laid-Open No. 09-091559 (FIGS. 1, 4 and 8)

  However, as described above, since the smoke detector is provided in the center of the casing, the visibility of the indicator lamp from the opposite side across the convex portion is poor from the side where the indicator lamp is attached. In order to eliminate this, indicator lights have to be installed at a plurality of locations around the smoke detection unit, which is restricted in terms of design and design and incurs high costs.

  The technical problem of the present invention is to ensure visibility of the indicator lamps from all directions and to reduce the number of indicator lamps.

  A thermal smoke combined fire detector according to the present invention includes a printed circuit board on which a heat-sensitive element for detecting heat and a smoke detector for detecting smoke flowing into the dark box are mounted, and stores the printed circuit board. A protective part that protects is provided in a protruding manner, and a housing provided with an insertion hole through which the tip of the thermosensitive element can be inserted, an indicator lamp attached to a printed circuit board, and a casing corresponding to the indicator lamp. The light guide insertion hole and the light guide material that is inserted into the light guide insertion hole so that the base end portion faces the indicator lamp and the distal end portion protrudes outward from the protection portion and engages the housing. And a light guide.

  In addition, the protective part is composed of a plurality of legs standing from the housing and a top plate connected to the plurality of legs, and the light guide is folded at the tip, and the outer surface of the folded part The surface of the folded portion is configured to be engageable with the top plate.

  In addition, the thermal element is arranged on the side near the dark box and is erected so that the tip protrudes outward from the protective part, the indicator lamp is arranged in the vicinity of the thermal element, and the light guide is folded back. The portion protrudes outward from the thermal element, and is arranged so that the tip of the thermal element is positioned within the arc of the folded portion.

  Further, the light guide is formed in a hawk shape at the tip side including the folded portion, and the thermal element is disposed at a position corresponding to the slit of the hawk.

  In the fire detector combined with a thermal smoke according to the present invention, a printed circuit board on which a thermal element for detecting heat and a smoke detector for detecting smoke flowing into the dark box are mounted, and the printed circuit board is housed, and the dark box The housing is provided with a housing that is provided with an insertion hole through which the tip of the thermosensitive element can be inserted, an indicator lamp attached to the printed circuit board, and an indicator lamp. Light guide material that is inserted into the light guide insertion hole and engaged with the housing so that the distal end protrudes outward from the protection portion and the base end faces the indicator lamp When the indicator lights when a fire is triggered, the light enters the light guide and is reflected by the surface layer portion (between the air layer: the interface) in the light guide. Propagating while emitting light at the tip . For this reason, the visibility from all directions is securable. In addition, when the incident light propagates in the light guide, if it is set to an incident angle at which a part of the light escapes from the light guide, the entire light guide can be shined, although it propagates while attenuating, Visibility can be further improved.

  In addition, the protective part is composed of a plurality of legs standing from the housing and a top plate connected to the plurality of legs, and the light guide is folded at the tip, and the outer surface of the folded part In addition, the end of the folded portion is configured to be engageable with the top plate, so that the light guide can function as one of the leg portions of the protective portion and is protected. The length of the light guide can be shortened by the protruding portion, leading to cost reduction. The light guide function can be added without increasing the number of parts as a whole. Furthermore, the light that is incident and propagates into the light guide is diffusely reflected by the rough surface processed portion provided on the outer surface of the folded portion protruding outward from the protective portion, and jumps out of the light guide. Therefore, the folded portion can emit light, and the visibility can be further improved. If the incident angle is set so that the incident light is totally reflected by the surface layer part (between the air layer: the interface) in the light guide, the attenuation during propagation to the rough surface processed part (turned part) can be reduced. It is possible to suppress the light emission amount (luminance) at the rough surface processed portion.

  In addition, the thermal element is arranged on the side near the dark box and is erected so that the tip protrudes outward from the protective part, the indicator lamp is arranged in the vicinity of the thermal element, and the light guide is folded back. The light guide can be made to function as a protector of the heat sensitive element because the portion protrudes outward from the heat sensitive element and the tip of the heat sensitive element is positioned within the arc of the folded portion. For this reason, it is not necessary to provide a separate protector for the thermal element, and the light guide function can be added while reducing the number of parts as a whole.

  In addition, the light guide is formed in a hawk-like shape on the tip side including the folded portion, and the thermal element is arranged at a position corresponding to the slit of the hawk, so that the thermal airflow from directly below the thermal element is also effective. Can be caught.

The present invention will be described below with reference to illustrated embodiments.
FIG. 1 is a perspective view showing a thermal smoke combined fire detector according to an embodiment of the present invention with a protective part of a dark box facing up, and FIG. 2 is a perspective view showing a state in which the protective part is removed from FIG. 3 is a perspective view showing a light guide as a main part thereof, FIG. 4 is a plan view, a front view, and a side view of the light guide, and FIG. 5 is a front view of the fire smoke combined type fire detector as viewed from the protection part side. 6 is a cross-sectional view taken along line AA in FIG. 5, FIG. 7 is a cross-sectional view showing an enlarged portion B of FIG. 6, and FIG. 8 is a cross-sectional view showing an enlarged main portion of FIG. .

  The thermal smoke combined fire detector of the present embodiment includes a thermal element that detects heat, that is, a thermistor 1, a smoke detector 3 that detects smoke flowing into the dark box 2, and an indicator lamp 4 made of LEDs, for example. The printed board 5 is attached to the main body 6a and the cover 6b. The printed board 5 is accommodated in the main body 6a, and a protective part 7 for protecting the dark box 2 is provided on the cover 6b. Further, the housing 6 provided with the insertion hole 8 through which the tip of the thermistor 1 can be inserted and the light guide insertion hole 9 corresponding to the indicator lamp 4, and the tip 12 a protrude outward from the protective part 7. At the same time, the light guide property can be inserted into the light guide insertion hole 9 so that the base end portion 12b faces the indicator lamp 4 and the locking portion 12c can be engaged with the edge of the housing, that is, the light guide insertion hole 9. Light guide 12 made of material and In which the provided.

  More specifically, the smoke detection unit 3 is set inside a cylindrical labyrinth body in which a large number of light shielding fins are arranged on the periphery so as to shield outside light and introduce only smoke particles, as is well known. The light emitting element 3a and the light receiving element 3b are arranged so as to face the smoke monitoring area (FIG. 5), and the light from the light emitting element 3a is projected toward the smoke monitoring area and smoke particles. Is received by the light receiving element 3b, and the presence or absence of smoke particles, that is, the presence or absence of fire is detected based on the output of the light receiving element 3b. An insect screen (not shown) is generally installed around the dark box 2.

  As shown in FIGS. 1 and 5, the protection unit 7 is formed of a plurality of leg portions 7a erected from the housing 6 and a top plate 7b connected to the leg portions 7a.

  The light guide 12 has a front end portion 12a folded back, and a rough surface processing 12d is applied to the outer surface of the folded portion, thereby providing light diffusion (translucency). In other words, the light guide 12 diffuses the light that is incident from the indicator lamp 4 and propagates at the roughened surface processing portion 12d that protrudes outward from the protection portion 7 and jumps out of the light guide 12. The folded portion can be made to emit light, and visibility from all directions can be secured. In addition, when the incident light propagates in the light guide, if it is set to an incident angle at which a part of the light escapes from the light guide, the entire light guide can be shined, although it propagates while attenuating, Visibility can be further improved. Further, if the light guide 12 is formed in a straight shape without a folded portion or a roughened portion, and the incident angle of incident light is set to an angle that totally reflects, attenuation during propagation to the tip surface is suppressed. It is possible to emit light with high brightness only at the tip surface. Further, in the case where the folded portion is provided as described above and the rough surface processed portion 12d is provided on the outer side surface, if the incident angle of the incident light is set to an angle for total reflection, the process reaches the rough surface processed portion 12d. Attenuation during propagation can be suppressed, the rough surface processed portion 12d can emit light with high luminance, and the visibility can be further improved.

  The light guide 12 is configured such that the end 12e of the folded portion can be engaged with the peripheral edge of the top plate 7b. For this reason, while being able to function the light guide 12 as one of the leg parts of the protection part 7, since the protection part 7 protrudes, the full length of the light guide 12 can be shortened, leading to a cost reduction. The light guide function can be added without increasing the number of parts as a whole.

  The thermistor 1 is arranged on the side near the dark box 2 and is erected so that the tip end portion 1a protrudes outward from the protection unit 7. The indicator lamp 4 is arranged near the thermistor 1, and the light guide 12 Are arranged such that the folded portion protrudes outward from the thermistor 1 and the tip portion 1a of the thermistor 1 is positioned within the arc of the folded portion. Since the thermistor 1 is arranged inside the light guide 12 in this way, the light guide 12 can function as a protector for the thermistor 1, and it is not necessary to provide a separate protector for the thermistor 1. A guide function can be added. Moreover, since the front-end | tip part 1a protrudes outward rather than the protection part 7, the thermistor 1 can catch the hot airflow from the direction which pinched | interposed the dark box 2 effectively. Further, since the thermistor 1 and the indicator lamp 4 are arranged close to each other, it is possible to reduce the size of the printed circuit board 5 and the size of the sensor itself.

  Further, the light guide 12 has a fork-like (bifurcated) tip side including the folded portion, and the thermistor 1 is disposed at a position corresponding to the fork slit 12f in the arc of the folded portion of the light guide 12. Has been. For this reason, the thermistor 1 can also capture the hot airflow from directly below. In addition, the opposing surface with the indicator lamp 4 in the base end part 12b of the light guide 12 is formed in the spherical surface 12g recessed as shown in FIG. 8 in order to improve light condensing property.

  As described above, the thermal smoke combined fire detector of the present embodiment guides the light of the indicator lamp 4 to the outside of the protection unit 7 by the light guide 12 to emit light, and causes the light guide 12 to emit light. Since it can function as one of the parts and as a protector of the thermistor 1, visibility can be further improved while reducing the number of parts as a whole.

  In addition, if a fluorescent paint is applied to the surface of the light guide 12 and light having a wavelength that can cause the fluorescent paint to develop a fluorescent phenomenon (for example, a blue LED) is used as a light source (indicator), the visibility is further improved. be able to.

It is a perspective view which shows the thermal smoke combined fire detector which concerns on one Embodiment of this invention in the state which faced the protection part of the dark box. It is a perspective view shown in the state where a protection part was removed from FIG. It is a perspective view which shows the light guide which is the principal part of the thermal smoke combined fire detector which concerns on one Embodiment of this invention. It is a top view, a front view, and a side view of a light guide of a combined heat and smoke fire detector according to an embodiment of the present invention. It is the front view which looked at the thermal smoke combined fire detector which concerns on one Embodiment of this invention from the protection part side. FIG. 6 is a cross-sectional view taken along line AA in FIG. 5. It is sectional drawing which expands and shows the B section of FIG. It is sectional drawing which expands and shows the principal part of FIG.

Explanation of symbols

1 Thermistor (thermal element)
DESCRIPTION OF SYMBOLS 1a The tip part of a thermistor 2 Dark box 3 Smoke detection part 4 Indicator lamp 5 Printed circuit board 6 Case 7 Protection part 7a Leg part 7b Top plate 8 Insertion hole 9 Light guide insertion hole 12 Light guide 12b Base end part 12d Rough surface processing part 12f Hawk slit

Claims (4)

A printed circuit board on which a thermal element for detecting heat and a smoke detector for detecting smoke flowing into the dark box are attached;
A housing provided with an insertion hole through which the printed circuit board is housed and a protective portion for protecting the dark box is protruded, and the tip of the thermal element can be inserted;
An indicator light attached to the printed circuit board;
A light guide insertion hole provided in the housing corresponding to the indicator lamp;
A light guide made of a light-guiding material that is inserted into the light guide insertion hole so that a distal end portion projects outward from the protection portion and a proximal end portion faces the indicator lamp and engages the housing. When,
A thermal smoke combined fire detector characterized by comprising: The protection part is composed of a plurality of legs standing from the housing and a top plate connected to the plurality of legs.
The light guide is configured such that the front end portion is folded, the outer surface of the folded portion is roughened, and the end of the folded portion is configured to be engageable with the top plate. The thermal smoke combined fire detector according to claim 1. The heat sensitive element is arranged on the side near the dark box and is erected so that the tip protrudes outward from the protection part,
The indicator lamp is disposed in the vicinity of the thermal element,
The said light guide is arrange | positioned so that the said folding | turning part may protrude outward from the said thermal element, and the front-end | tip part of the said thermal element may be located in the circular arc of this folding | turning part. No fire smoke combined fire detector. The light guide is formed in a hawk shape on the tip side including the folded portion,
4. The thermal smoke combined fire detector according to claim 3, wherein the thermal element is disposed at a position corresponding to the slit of the hawk.

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