JP4999812B2 - Fire alarm - Google Patents

Description

  The present invention relates to a fire alarm, and more particularly to a fire alarm capable of being reduced in size and thickness.

  Some devices for detecting a fire, such as a fire alarm, use a battery as a driving power source. As a conventional fire alarm (detector) using such a battery as a driving power source, for example, “a battery holding portion made of a plurality of support ribs is provided at the bottom of the main body, and a part of the printed circuit board is cut away. A housing portion is formed, one of the battery terminal connection portions provided on both sides of the battery housing portion of the printed circuit board is provided at a position away from the battery housing portion, and the other terminal connection portion is provided close to the battery housing portion. (For example, refer to Patent Document 1).

JP-A-9-293181 (paragraph 0010, FIG. 1)

  However, the conventional fire alarm (detector) is provided with a fire detection part and a battery storage part (battery storage part) in another place so as to avoid it. Therefore, there has been a problem that the fire alarm (detector) cannot be reduced in size and thickness.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a fire alarm that can be reduced in size and thickness.

Fire alarm according to the present invention includes: a smoke detection portion is a fire detector, a fire determination section for determining a fire on the basis of the output signal of the smoke detection portion, a battery for supplying power to the fire discriminating section A fire alarm that outputs a fire alarm when the fire determination unit determines that a fire has occurred , and the smoke detection unit prevents external light from entering the smoke detection unit. A wall, a light emitting element that emits light to the inside of the smoke detector, a light receiving element that receives scattered light emitted from the smoke element of the smoke detector, and an irradiation range of the light emitting element And a smoke detection part that is a superposition part of the light receiving range of the light receiving element, and the battery storage part is formed so as to cut out a part that does not hinder the smoke detection function in the smoke detection part. Is.

Further, the prior SL battery housing portion, in the smoke detection portion, so as to cut out the irradiation range and partial avoiding the receiving range of up to the smoke detection portion of the light receiving element to the smoke detection portion of the light emitting element Is formed.

  The battery housing part is formed so as to cut out the smoke detecting part on the side where the angle formed by the optical axis of the light emitting element and the optical axis of the light receiving element is an acute angle.

In the present invention, since the battery housing so as to cut out portions do not hinder the smoke detecting function is formed in the smoke detection portion, miniaturization of the fire alarm can be made thinner.

  For example, in a scattered light type fire alarm device, a battery is formed by cutting out the portion of the smoke detector that avoids the irradiation range to the smoke detector of the light emitting element and the light receiving range of the light receiver to the smoke detector. By forming the storage portion, the fire alarm can be reduced in size and thickness.

  At this time, if the battery housing part is formed so as to cut out the smoke detection part (fire detection part) on the side where the angle between the optical axis of the light emitting element and the optical axis of the light receiving element is an acute angle, It has the least effect on the smoke detection function.

Embodiment 1 FIG.
There are various types of fire alarms such as fire alarms that detect smoke with light emitting and receiving elements, fire alarms that detect heat with heat receiving elements, and fire alarms that detect flame with infrared rays. To do. In the following embodiments, a case will be described in which the present invention is applied to a fire alarm device that detects smoke with a light emitting element and a light receiving element.

  1 is a longitudinal sectional view showing a smoke detector section of a fire alarm according to Embodiment 1 of the present invention, FIG. 2 is a bottom view of the smoke detector section, FIG. 3 is a right side view of the smoke detector section, FIG. 1 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 5 is a cross-sectional view taken along the line BB in FIG. These FIG. 1 to FIG. 5 show the scales partially different. Hereinafter, the fire alarm device according to the first embodiment will be described with reference to FIGS. In the following description, description will be made in accordance with the vertical and horizontal directions in FIG.

  The smoke detector 1 of the fire alarm 100 is composed of a smoke inflow portion 10 and a mounting portion 20. Here, the smoke detector 1 corresponds to the fire detector of the present invention. The smoke inflow portion 10 has a substantially cylindrical shape, and includes a plate member 11 and a wall body 12. The plate member 11 has a substantially disk shape, and an opening 13 is formed at a substantially central portion. Further, on the outer peripheral portion of the plate member 11, convex portions 11 a and convex portions 11 b are formed at corresponding positions of a light emitting element holder 26 and a light receiving element holder 27 described later. A plurality of, for example, substantially J-shaped wall bodies 12 are erected in a substantially annular shape with a predetermined interval at a peripheral portion on the lower surface side of the plate member 11. Thereby, the smoke inflow part 10 is formed in a substantially cylindrical shape so that the upper surface part is covered with the plate member 11. The wall body 12 prevents external light from entering the smoke inflow portion 10. A space (predetermined interval) formed between the wall bodies 12 serves as a smoke inlet 14 for smoke to flow into the smoke inflow portion 10. The opening on the lower surface side of the smoke inflow portion 10 is closed by the lid body 16, and the inside of the smoke inflow portion 10 is a dark box. In addition, an insect net (not shown) is provided on the side surface of the smoke inflow portion 10 in order to prevent insects from entering from the smoke inlet 14.

  A mounting portion 20 is provided above the smoke inflow portion 10. The mounting unit 20 includes an optical bench 21, a light emitting element 22, a light receiving element 23, a light shielding member 24, and the like. The optical bench 21 has a substantially cylindrical shape with an opening at the bottom, and is provided with a light emitting element holder 26 for accommodating the light emitting element 22 and a light receiving element holder 27 for accommodating the light receiving element 23. The outer end portions of the light emitting element holder 26 and the light receiving element holder 27 are provided so as to protrude from the outer peripheral portion of the optical bench 21. In a state where the smoke inflow portion 10 is provided below the mounting portion 20, the smoke inflow portion 10 that is a dark box closes the opening of the optical bench 21. Thereby, the inside of the optical bench 21 is also a dark box. In addition, in a state where the smoke inflow portion 10 is provided below the mounting portion 20, the smoke inflow portion 10 and the mounting portion 20 communicate with each other through the opening 13. In the first embodiment, the height dimension of the mounting portion 20 is larger than the height dimension of the smoke inflow portion 10.

  The light emitting element holder 26 is provided with a pair of holding members 26a made of hooks, for example. The light emitting element 22 is accommodated in the light emitting element holder 26 while being held between the holding members 26 a. At this time, the lead portion of the light emitting element 22 is bent at a substantially right angle, is inserted through a through hole 26 b formed in the light emitting element holder 26, and protrudes from the upper surface portion of the optical bench 21.

  The light receiving element 23 is provided in the shield case 28 and is housed in the light receiving element holder 27 together with the shield case 28. The shield case 28 has a substantially rectangular tube shape with an opening in a range facing the light receiving part of the upper part and the light receiving element 23. The shield case 28 is provided with a holding member 28 a made of, for example, a pressing piece. The light receiving element 23 is sandwiched between the side surface portion of the shield case 28 and the holding member 28 a and is provided in the shield case 28. A convex portion 28b is formed on the upper portion of the shield case 28. By inserting the convex portion 28b into an opening formed in the circuit board 2 and soldering, the shield case 28 and the light receiving element 23 are fixed. ing.

  In a state where the light emitting element 22 and the light receiving element 23 are housed in the optical bench 21, the light emitting element 22 is provided so that the irradiation range 22b faces substantially the center of the optical bench 21, and the light receiving element 23 receives the light receiving element 23. The range 23 b is provided so as to face the substantially central portion of the optical bench 21. Further, the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 are provided so as to be substantially parallel in a side view and at a predetermined angle in a plan view. That is, smoke is detected by the smoke detection unit 25 that is a superposition of the irradiation range 22 b of the light emitting element 22 and the light receiving range 23 b of the light receiving element 23. More specifically, the light receiving element 23 receives light scattered by the smoke that is emitted from the light emitting element 22 and enters the smoke detection unit 25.

  Further, a light shielding member 24 is erected on the optical bench 21 on the side where the angle formed by the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 is an acute angle. The cross-sectional shape of the light shielding member 24 in a plan view is, for example, a substantially hexagonal shape, and is a shape in which a corner on the center side of the optical bench 21 is cut out in a substantially U shape. Thus, the light shielding member 24 is formed with an edge portion 24a and an edge portion 24b. The edge portion 24a prevents the light receiving element 23 from directly receiving the light emitted from the light emitting element 22. The edge portion 24b prevents the light receiving element 23 from receiving the light irregularly reflected by the edge portion 24a.

  The mounting portion 20 is mounted on the lower surface portion of the circuit board 2. A plurality of electrical components (not shown) are mounted on the circuit board 2, and these electrical components constitute a fire determination unit 3. In a state where the mounting unit 20 is mounted on the circuit board 2, the light emitting element 22 and the light receiving element 23 and the fire determination unit 3 are electrically connected. And the fire discrimination | determination part 3 discriminate | determines whether the fire broke out based on the light reception amount which the light receiving element 23 detects. The amount of received light detected by the light receiving element 23 is output to the fire discriminating unit 3 by voltage or the like, for example.

  The smoke detector 1 and the circuit board 2 are provided in a housing (not shown) in which air permeability to the smoke inflow portion 10 is ensured, and constitute a fire alarm 100. And this fire alarm 100 is installed in monitoring spaces, such as a house, a building, and a hotel room, for example. In a state in which the fire alarm 100 is attached to the ceiling surface of the monitoring space, the fire alarm 100 is installed with the smoke inflow portion 10 on the lower side, as shown in FIG.

  The fire alarm device 100 uses, for example, a battery 30 that is a lithium battery as a drive source. That is, the battery 30 supplies power to the light emitting element 22 of the smoke detector 1, the fire determination unit 3 of the circuit board 2, and the like. The battery 30 is provided on the side of the circuit board 2 on the side where the angle formed by the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 is an acute angle. The battery 30 is provided so as to cut out part of the upper surface portion and the side surface portion of the mounting portion 20. That is, the battery storage part that stores the battery 30 is provided so as to cut out part of the upper surface part and the side part of the mounting part 20. By providing the battery 30 (battery storage part) so as to cut out part of the upper surface part and the side part of the mounting part 20, the fire alarm device 100 can be reduced in size and thickness. Note that the notched portion of the mounting portion 20 is closed to prevent external light from entering.

  The battery 30 (battery storage part) does not necessarily have to be provided at the position shown in the first embodiment, as long as the part that does not hinder the smoke detection function of the mounting part 20 is cut out. Good. In other words, the battery 30 (battery storage unit) cuts out the portion of the mounting unit 20 that avoids the irradiation range 22b of the light emitting element 22 to the smoke detection unit 25 and the light receiving range 23b of the light receiving element 23 to the smoke detection unit 25. What is necessary is just to form. On the side where the angle formed by the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 is an acute angle, the smoke detection unit 25 is separated by the light shielding member 24, so a battery 30 (battery storage unit) is provided. This is the place where the influence on the smoke detection function of the mounting unit 20 is minimal. Therefore, in the first embodiment, a part of the upper surface portion and the side surface portion of the mounting portion 20 on the side where the angle formed by the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 is an acute angle is cut out. Thus, the battery 30 (battery storage part) is provided.

(Description of operation)
Next, the operation of the fire alarm device 100 according to the first embodiment will be described.
FIG. 6 is a longitudinal sectional view showing the smoke detector of the fire alarm according to Embodiment 1 of the present invention. Note that FIG. 6 is a cross-sectional view taken along the line CC of FIG. 4, and the flow of smoke in the smoke detector section 1 is indicated by broken-line arrows.

  The smoke generated by the fire flows along the ceiling surface of the monitoring space and flows into the smoke inflow section 10 of the smoke detector section 1. At this time, the light shielding member 24 is provided only in the mounting portion 20. That is, the light shielding member 24 is not provided in the smoke inflow portion 10. Further, neither the light emitting element 22 nor the light receiving element 23 is provided in the smoke inflow portion 10. Therefore, the light shielding member 24 or the like does not block the flow of smoke flowing into the smoke inflow portion 10, and the smoke inflow characteristics of the smoke inflow portion 10 are improved. Note that the light shielding member 24 is not necessarily provided only in the mounting portion 20, and the tip portion of the light shielding member 24 is inserted into the smoke inflow portion 10 as long as the smoke inflow characteristics of the smoke inflow portion 10 do not deteriorate. May be. By providing the light shielding member 24 with such a length that the tip portion is inserted into the smoke inflow portion 10, it is possible to more reliably prevent the light receiving element 23 from directly receiving the light emitted by the light emitting element 22. .

  Smoke has low inertia because of its small particle mass. Therefore, since the flow state is easily changed, the smoke that has flowed into the smoke inflow portion 10 flows into the mounting portion 20 through the opening portion 13. When smoke flows into the mounting portion 20, the light emitted from the light emitting element 22 is scattered by the smoke. This scattered light is received by the light receiving element 23. That is, the amount of light received by the light receiving element 23 changes. The light receiving element 23 outputs a detection value (voltage or the like) corresponding to the amount of received light to the fire determination unit 3. Based on this detection value, the fire determination unit 3 determines whether or not a fire has occurred. When it is determined that a fire has occurred, the fire determination unit 3 warns the surroundings that a fire has occurred by a light emitting element such as an LED or an alarm device (not shown) such as a buzzer. In the first embodiment, since the height dimension of the mounting portion 20 is larger than the height dimension of the smoke inflow portion 10, the smoke that has flowed into the smoke inflow portion 10 easily flows into the mounting portion 20. Yes. For this reason, the fire discrimination | determination part 3 (fire alarm device 100) can judge a fire accurately.

  In the fire alarm device 100 configured as described above, a portion of the mounting unit 20 that avoids the irradiation range 22b to the smoke detection unit 25 of the light emitting element 22 and the light reception range 23b to the smoke detection unit 25 of the light receiving element 23 is avoided. Since the battery 30 (battery storage part) is provided so as to be cut out, the fire alarm device 100 can be reduced in size and thickness.

  Further, the battery 30 (battery storage) is formed by cutting out a part of the upper surface portion and the side surface portion of the mounting portion 20 on the side where the angle formed by the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 is an acute angle. Part) is provided, the installation of the battery 30 (battery storage part) has little influence on the smoke detection function of the mounting part 20.

  Note that, in the smoke detector section 1 according to the first embodiment, the mounting section 20 and the smoke inflow section 10 are arranged so that the mounting section 20 is on the upper side. Not only this but the mounting part 20 and the smoke inflow part 10 may be piled up so that the smoke inflow part 10 may become the upper side, and the smoke detection part 1 may be comprised. By placing the mounting part 20 on the upper side, the smoke detecting part 1 can be mounted on the circuit board 2 with the mounting part 20 on the circuit board 2 side. For this reason, the connection between the light receiving element 23 of the mounting unit 20 and the fire determination unit 3 of the circuit board 2 is facilitated. Therefore, in the smoke detector section 1 according to the first embodiment, the mounting section 20 and the smoke inflow section 10 are arranged so that the mounting section 20 is on the upper side.

  In addition, the fire alarm 100 according to the first embodiment has configured the smoke detector 1 by dividing the smoke inflow portion 10 and the mounting portion 20, but the detection is provided with the light emitting element 22 and the light receiving element 23 in the smoke inflow portion. You may implement this invention to the fire alarm which has a smoke part. Moreover, you may implement this invention not only to a scattered light type fire alarm but to a dimming type fire alarm.

Embodiment 2. FIG.
Moreover, you may implement this invention not only to the fire alarm which detects smoke but to other fire alarms.
FIG. 7 is a longitudinal sectional view showing another example of the fire alarm according to Embodiment 2 of the present invention. FIG. 7 shows a thermal fire alarm that detects heat from a fire by means of a heat receiving element.

  The housing 201 of the thermal fire alarm 200 has a substantially cylindrical shape. A fire detection unit 210 is provided at the bottom of the housing 201. The fire detection unit 210 includes a protector 211, a heat receiving element 212, and the like. The protector 211 has a substantially cylindrical shape that expands from the lower side to the upper side. The protector 211 protects the heat receiving element 212 from receiving an external force, and is provided so that the upper surface portion is in contact with the lower surface portion of the housing 201. For example, a heat receiving element 212 such as a thermistor is provided inside the protector 211. The heat receiving element 212 is connected to a circuit board 214 provided in the housing 201 via a wiring part 213. A plurality of electrical components (not shown) are mounted on the circuit board 214, and these electrical components constitute a fire determination unit 215. The heat receiving element 212 is connected to the fire determination unit 215.

  The thermal fire alarm 200 uses a battery 230, which is a lithium battery, for example, as a drive source. That is, the battery 230 supplies power to the fire determination unit 215 and the like of the circuit board 214. The battery 30 is provided on the side of the circuit board 214. The battery 230 is provided so as to cut out a part of the fire detection unit 210. That is, the battery storage unit that stores the battery 230 is provided so as to cut out a part of the fire detection unit 210. By providing the battery 230 (battery storage unit) so as to cut out a part of the fire detection unit 210, the thermal fire alarm device 200 can be reduced in size and thickness. In addition, the convex part 201a of the housing | casing 201 is inserted in the notched part of the fire detection part 210. FIG. Thereby, the volume of the fire detection part 210 is small.

  The battery 230 (battery storage part) is not necessarily provided at the position shown in the second embodiment, and may be formed by cutting out a part that does not hinder the heat detection function of the fire detection part 210. Good.

It is a longitudinal cross-sectional view which shows the smoke detection part of the fire alarm which concerns on Embodiment 1 of this invention. It is a bottom view which shows the smoke detection part of the fire alarm which concerns on Embodiment 1 of this invention. It is a right view which shows the smoke detection part of the fire alarm which concerns on Embodiment 1 of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a longitudinal cross-sectional view which shows the smoke detection part of the fire alarm which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows another example of the fire alarm device which concerns on Embodiment 2. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Smoke detection part, 2 circuit board, 3 fire discrimination part, 10 smoke inflow part, 11 board member, 11a convex part, 11b convex part, 12 wall body, 13 opening part, 14 smoke inflow port, 16 lid body, 20 mounting Part, 21 optical bench, 22 light emitting element, 22a optical axis, 22b irradiation range, 23 light receiving element, 23a optical axis, 23b irradiation range, 24 light shielding member, 24a edge part, 24b edge part, 25 smoke detection part, 26 light emitting element Holder, 26a Holding member, 26b Through hole, 27 Light receiving element holder, 28 Shield case, 28a Holding member, 28b Convex part, 30 Battery, 100 Fire alarm, 200 Thermal fire alarm, 201 Housing, 210 Fire detection part , 211 protector, 211a convex part, 212 heat receiving element, 213 wiring part, 214 circuit board, 215 fire discrimination part, 230 battery.

Claims (3)

Yes and smoke detection portion is a fire detector, a fire determination section for determining a fire on the basis of the output signal of the smoke detection portion, and a battery accommodating portion for accommodating a battery for supplying power to the fire discriminating section, a In the fire alarm that outputs a fire alarm when the fire discriminating unit determines that there is a fire,
The smoke detector
A wall for preventing external light from entering the smoke detector;
A light emitting element for irradiating light inside the smoke detector;
A light receiving element that receives the scattered light emitted from the smoke detector and emitted by smoke particles of the smoke detector;
A smoke detector that is a superposition of the irradiation range of the light emitting element and the light receiving range of the light receiving element;
With
The battery housing unit, fire alarm, characterized in that it is formed so as to cut out portions do not hinder the smoke detecting function of the smoke detection portion. Before Symbol battery compartment,
In the smoke detector, the light emitting element is formed so as to cut out a portion of the light emitting element that avoids an irradiation range to the smoke detecting part and a light receiving range of the light receiving element to the smoke detecting part. The fire alarm according to claim 1 . The battery compartment is
3. The fire alarm according to claim 2, wherein the smoke detection unit is formed by cutting out the smoke detecting portion on the side where the angle formed by the optical axis of the light emitting element and the optical axis of the light receiving element is an acute angle. vessel.

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