JP2011192245A - Heat and smoke compound type fire sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat and smoke compound type fire sensor making unnecessary a protective structure section projecting outside to protect a temperature detection section. <P>SOLUTION: The temperature detection section 16 in the heat and smoke compound type fire sensor 1 provided with a smoke detection section 2 and the temperature detection section 16 has the non-contact temperature detection section installed inside the sensor 1 for measuring the temperature of an inner surface 5a of an outside exposed surface 5 of the sensor 1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a combined fire and smoke detector, and more particularly, to a combined fire and smoke detector including a non-contact temperature sensor.

  2. Description of the Related Art Conventionally, there is a combined heat smoke fire detector having a smoke detector and a temperature detector. Such a thermal smoke combined fire detector is provided with a temperature sensor protruding from the casing in order to measure the temperature by exposing the temperature detection unit to the ambient atmosphere. For this reason, if an external force is applied to the temperature detection unit due to a collision with the temperature detection unit, the temperature detection unit may be deformed and temperature measurement may become impossible or accurate temperature measurement may not be possible. In order to protect from an external force, a protective structure is provided (for example, see Patent Document 1).

JP-A-9-91559

  However, when such a protective structure is provided, there is a problem that the entire thermal smoke combined fire detector is enlarged or the flow of smoke into the smoke detector is hindered.

  Therefore, an object of the present invention is to provide a thermal smoke combined fire detector that does not require the protective structure as described above.

  The present invention relates to a combined heat and smoke fire detector having a smoke detector and a temperature detector, wherein the temperature detector is provided inside the sensor, and the temperature of the inner surface of the sensor externally exposed surface is set inside. It is a non-contact temperature detector that measures from

  The present invention also relates to a thermal smoke combined fire sensor comprising a smoke detector and a temperature detector, wherein the temperature detector is provided inside the sensor, and the temperature of the inner surface of the sensor externally exposed surface. It is a non-contact temperature detection unit and a self-temperature detection unit for measuring the temperature from the inside.

  Further, the present invention is the combined heat and smoke fire sensor, wherein the inner surface is a top surface of the smoke detection unit.

  In addition, the present invention is the fire smoke combined fire detector, wherein the top surface is made of carbon.

  Further, the present invention is the thermal smoke combined fire detector, wherein the non-contact temperature detection unit is provided on a bottom surface side of the smoke detection unit.

  According to the present invention, the smoke detector section includes a plurality of wall bodies that prevent external light from entering the smoke detector section, a light emitting element, and a light receiving element. An opening that can see the surface is formed in the field of view, and the non-contact temperature detector is disposed on the bottom surface.

  The thermal smoke combined fire detector of the present invention has a non-contact temperature detector provided inside the sensor, so that the non-contact temperature detector measures the temperature of the inner surface of the sensor externally exposed surface. It is possible to provide a thermal smoke combined fire detector that does not require a structure, does not increase in size as a whole, is thin, and does not hinder the inflow of smoke into the smoke detector.

  In addition, the non-contact temperature detection unit and the self-temperature detection unit are provided inside the sensor, so that the temperature of the non-contact temperature detection unit is based on the temperature around the non-contact temperature detection unit acquired by the self-temperature detection unit. Since correction is possible, the temperature of the surrounding environment can be measured more accurately than when there is no self-temperature detector.

  Further, the non-contact temperature detecting unit measures the temperature of the top surface of the sensor externally exposed surface, so that the top surface of the smoke detecting unit can be used, so that the size can be further reduced.

  Moreover, temperature measurement is made quicker and more accurate by making the top surface of the smoke detector section of carbon having high thermal conductivity and high infrared emissivity.

  Further, since the non-contact temperature detection unit is provided on the bottom surface side of the smoke detection unit, for example, the non-contact temperature detection unit can be mounted on the substrate on the bottom surface side of the smoke detection unit. It is not necessary to provide a structure and can be manufactured at a low cost.

  Further, the smoke detector has a plurality of walls that prevent external light from entering the smoke detector, and an opening that allows the top surface to be seen from the bottom is formed in the field of view. Since the contact temperature detector is arranged on the bottom surface, the opening of the smoke detector is only an opening formed for the non-contact temperature detector to look inside the smoke detector. Can be prevented.

It is sectional drawing in the II line | wire of FIG. It is a front view which shows the thermal smoke combined fire detector of this invention. It is sectional drawing in the III-III line of FIG.

  An embodiment of the present invention will be described with reference to FIGS. The smoke detection unit 2 of the thermal smoke combined fire detector 1 includes a smoke inflow unit 3, a mounting unit 4 mounted on a circuit board 18, and the like. The smoke inflow portion 3 has a substantially cylindrical shape, and includes a plate member 6 and a wall body 7. The plate member 6 has a substantially disc shape, and an opening 8 is formed at a substantially central portion.

  Further, on the outer peripheral portion of the plate member 6, convex portions 6 a and 6 b are formed at corresponding positions of a light emitting element holder 9 and a light receiving element holder 10 which will be described later. A plurality of, for example, substantially J-shaped wall bodies 7 are provided in a substantially annular shape so as to surround the peripheral edge 8 a of the opening 8 at a predetermined interval at the peripheral edge of the lower surface side of the plate member 6. Has been. Thereby, the smoke inflow part 3 is formed in a substantially cylindrical shape so that the upper surface part is covered with the plate member 6. The wall body 7 prevents external light from entering the smoke inflow portion 3.

  A space (predetermined interval) formed between the wall bodies 7 serves as a smoke inlet 11 for smoke to flow into the smoke inflow portion 3. The opening on the lower surface side of the smoke inflow portion 3 is closed by the lid 5, and therefore the inside of the smoke inflow portion 3 is a dark box. In addition, an insect net (not shown) is provided on the side surface of the smoke inflow portion 3 in order to prevent insects from entering from the smoke inlet 11.

  A mounting portion 4 is provided above the smoke inflow portion 3. The mounting unit 4 includes an optical bench 12, a light emitting element 13, a light receiving element 14, a light shielding member 15, a temperature detecting unit 16 described later, and the like. The optical bench 12 has a substantially cylindrical shape with an opening at the bottom, and is provided with a light emitting element holder 9 for accommodating the light emitting element 13 and a light receiving element holder 10 for accommodating the light receiving element 14.

  The outer end portions of the light emitting element holder 9 and the light receiving element holder 10 are provided so as to protrude from an outer peripheral portion (not shown) of the optical bench 12. In a state where the smoke inflow portion 3 is provided below the mounting portion 4, the smoke inflow portion 3 serving as a dark box closes the opening of the optical bench 12. Therefore, the inside of the optical bench 12 is also a dark box. In addition, in a state where the smoke inflow portion 3 is provided below the mounting portion 4, the smoke inflow portion 3 and the mounting portion 4 communicate with each other through the opening 8. In the present embodiment, the height dimension of the mounting portion 4 is larger than the height dimension of the smoke inflow portion 3.

  The light emitting element 13 is sandwiched and stored in the light emitting element holder 9 by a holding member (not shown) provided in the light emitting element holder 9 so that the light emitting portion thereof faces substantially the center of the optical bench 12.

  The light receiving element 14 is provided in the shield case 17 so that the light receiving portion thereof faces substantially the center of the optical bench 12, and is housed in the light receiving element holder 10 together with the shield case 17. The shield case 17 has a substantially rectangular tube shape with its upper part and a part facing the light receiving part opened. The shield case 17 is provided with a holding member 17 a, and the light receiving element 14 is sandwiched between the side surface portion of the shield case 17 and the holding member 17 a and provided in the shield case 17. A convex portion 17b is formed on the upper portion of the shield case 17, and the shield case 17 and the light receiving element 14 are fixed by inserting the convex portion 17b into an opening formed in a circuit board 18 described later and soldering. ing.

  The light emitting element 13 and the light receiving element 14 are such that the light emitting part of the light emitting element 13 and the light receiving part of the light receiving element 14 do not face each other, and the light emitting range and the light receiving range intersect each other at the approximate center of the optical bench 12. As is provided. Therefore, smoke is detected at the overlap portion between the light emission range and the light reception range. More specifically, the light receiving element 14 receives light scattered from the smoke by the light emitted from the light emitting element 13.

  A light shielding member 15 is erected on the optical bench 12. The light shielding member 15 shields part of the light emitted from the light emitting portion of the light emitting element 13 and prevents the light from being directly received by the light receiving element 14. The shape, size, and the like are appropriately determined depending on the arrangement of the light emitting element 13 and the light receiving element 14.

  The mounting portion 4 is mounted on the lower surface portion of the circuit board 18. A plurality of electrical components (not shown) are mounted on the circuit board 18, and these electrical components constitute a fire determination unit 19 and the like. In a state where the mounting unit 4 is mounted on the circuit board 18, the light emitting element 13 and the light receiving element 14 and the fire determination unit 19 are electrically connected. And the fire discrimination | determination part 19 discriminate | determines whether the fire broke out based on the output value of the temperature detection part 16 and the light receiving element 14 which are mentioned later.

  The thermal smoke combined fire detector 1 further includes a temperature detection unit 16 therein. In the present embodiment, the temperature detector 16 is provided at the center of the bottom surface of the smoke detector 2, and the bottom surface is the lower surface of the circuit board 18, that is, the mounting surface 18a.

  The temperature detection unit 16 includes a non-contact temperature detection unit and a self temperature detection unit.

  The non-contact temperature detector of the temperature detector 16 is a sensor that detects the temperature of the inner surface of the sensor externally exposed surface. In the present embodiment, the inner surface is the top surface of the smoke detector 2 and the inner surface 5 a of the lid 5. Note that a visual field is formed through the opening 8 from the bottom surface of the smoke detector 2, that is, from the mounting surface 18 a of the circuit board 18 to the top surface of the smoke detector 2, that is, the inner surface 5 a of the lid 5. Has been. For example, a thermopile can be used for the non-contact temperature detection unit. The thermopile is an infrared sensor that receives infrared rays radiated from an object and generates a thermoelectromotive force according to the amount of energy. In this embodiment, the thermopile increases from the inner surface 5a as the temperature of the lid 5 increases. Receiving infrared radiation, it detects temperature rise in the monitoring space.

  The self-temperature detection unit of the temperature detection unit 16 is a sensor that detects the temperature around the temperature detection unit 16. For example, a thermistor can be used as the self-temperature detection unit. The thermistor is a resistor that exhibits an extremely large resistance change with respect to a temperature change.

  In the present embodiment, the lid body 5 of the smoke inflow portion 3 has a function as a heat absorbing plate, and can be made of, for example, carbon, resin, and metal such as copper or aluminum coated with black body paint. it can. Although it is preferable to make carbon with both high thermal conductivity and infrared radiation emissivity, the entire lid 5 does not necessarily have to be made of carbon, and at least the surface of the non-contact temperature detecting portion's field of view on the inner surface 5a. Should be made of carbon.

  Moreover, the structure of the temperature detection part 16 can be changed suitably. For example, the non-contact temperature detection unit and the self-temperature detection unit may be provided in the vicinity of the non-contact temperature detection unit separately from the self-temperature detection unit without forming a single package. Further, if the temperature correction process described later is not necessary, the self-temperature detection unit need not be provided.

  The smoke detector 2 is provided in a housing 20 in which air permeability to the smoke inflow portion 3 is ensured, and constitutes a thermal smoke combined fire detector 1. The thermal smoke combined fire detector 1 is installed on a ceiling surface or the like of a monitoring space (not shown) with the smoke inflow portion 3 facing downward. Therefore, in the thermal smoke combined fire detector 1, the lid 5 has its outer surface exposed to the outside toward the monitoring space.

  The fire smoke combined fire detector 1 is connected to a power source (not shown). As the power source, for example, a battery such as a lithium battery can be used.

  The operation of the fire smoke combined fire detector 1 of the present invention will be described.

  First, the operation of the temperature detection unit 16 will be described. The temperature of the lid 5 exposed to the outside of the combined heat and smoke fire detector 1 is increased by a heat source such as a flame generated by a fire. The lid 5 increases the infrared rays emitted as the temperature rises. The non-contact temperature detection unit of the temperature detection unit 16 detects infrared radiation radiated from the inner surface 5 a of the lid 5 and outputs a value (voltage or the like) corresponding to the detected amount to the fire determination unit 19.

  At that time, the self-temperature detecting unit of the temperature detecting unit 16 detects the temperature around the temperature detecting unit 16 (non-contact temperature detecting unit), and the self-temperature detecting unit also detects a detected value (voltage or the like) according to the temperature. Is output to the fire discrimination unit 19. The fire determination unit 19 corrects the detection value output from the non-contact temperature detection unit (temperature correction processing) based on the detection value output from the self-temperature detection unit.

  Here, it is preferable that the lid 5 is made of a material having high infrared emissivity and high thermal conductivity. When the inner surface 5a of the lid 5 is made of a material having a low infrared emissivity, the change of the infrared radiation energy with respect to the temperature change of the inner surface 5a is small, so that the change is difficult to detect. If the output voltage is amplified, noise will be amplified and countermeasures against noise will be required. Further, when the thermal conductivity of the lid 5 is low, the temperature of the inner surface 5a is difficult to rise, so the temperature rise of the inner surface 5a of the lid 5 cannot quickly follow the temperature rise of the monitoring space. This means that the temperature change in the monitoring space cannot be detected quickly.

  The lid 5 can be made of metal or resin. Generally, metals have high thermal conductivity but low infrared emissivity, and the infrared emissivity can be obtained by coating with a black body paint. On the contrary, this black body paint causes a decrease in thermal conductivity. Resins have high infrared emissivity but low thermal conductivity. Therefore, the lid 5 is preferably made of carbon having both high infrared emissivity and high thermal conductivity.

  For example, the lid 5 can be made of dry carbon. Dry carbon is a carbon fiber impregnated with resin, baked by applying pressure in a high-temperature and high-pressure kettle. It removes unnecessary resin and is lightweight and rigid. Further, other carbon fiber composite materials such as wet carbon can be appropriately selected and used.

  Next, the operation of the smoke detector 2 will be described. When smoke is generated by a fire, the smoke flows along the ceiling surface of the monitoring space and flows into the smoke inflow portion 3 of the smoke detector 2. The smoke that flows in flows into the mounting portion 4 through the opening 8. At that time, the light irradiated by the light emitting element 13 is scattered by the smoke particles. The scattered light is received by the light receiving element 14, and the light receiving element 14 outputs a detection value (voltage or the like) corresponding to the amount of received light to the fire determination unit 19.

  When the fire determination unit 19 detects a predetermined temperature rise or a predetermined temperature in the monitoring space based on the detection value (detected value subjected to the temperature correction process) output from the temperature detection unit 16, the fire detection unit 2 receives the light. The sensitivity of the element 14 is increased. Further, the generation of smoke in the space is determined based on the detection value output from the light receiving element 14 of the smoke detector 2, and it is determined whether or not a fire has occurred. When the fire discriminating unit 19 discriminates the occurrence of a fire, the fire discriminating unit 19 warns the occurrence of the fire to the surroundings by a light emitting element such as an LED or an alarm device (not shown) such as a buzzer.

  In the present embodiment, when the temperature rise in the monitoring space is detected, the sensitivity of the light receiving element 14 of the smoke detector 2 is increased, but the sensitivity is not increased, and the occurrence of a fire is detected based on the detection value output from the light receiving element 14. You may change the threshold value to judge.

  Further, the detection value output from the non-contact temperature detection unit of the temperature detection unit 16 is corrected based on the detection value output from the light receiving element 14, and based on the corrected detection value, whether or not a fire has occurred is determined. It may be determined.

  In addition, the detection value output from the light emitting element 14 and the detection value output from the non-contact temperature detection unit of the temperature detection unit 16 are determined based on thresholds individually provided to determine whether or not a fire has occurred. By doing so, it is possible to deal with a fire with a lot of smoke or a fire with only a large rise in heat with a single fire detector.

  As described above, since the temperature detection unit 16 is provided in the thermal smoke combined fire detector 1 of the present embodiment, the protection projecting to the outside for protecting the temperature detection unit 16 is provided. No structural part is required. Although the present invention is a combined heat and smoke fire detector, a non-contact temperature sensor may be incorporated into a flame detector including a flame detection unit to form a combined flame and fire detector.

DESCRIPTION OF SYMBOLS 1 Thermal smoke combined type fire detector 2 Smoke detection part 3 Smoke inflow part 4 Mounting part 5 Cover body 5a Inner surface 6 Plate member 6a Projection part 6b Projection part 7 Wall body 8 Opening part 8a Perimeter 9 Light emitting element holder 10 Light receiving element holder 11 Smoke inlet 12 Optical stand 13 Light emitting element 14 Light receiving element 15 Light shielding member 16 Temperature detection part 17 Shield case 17a Holding member 17b Protrusion part 18 Circuit board 18a Mounting surface 19 Fire discrimination part 20 Housing

Claims (6)

In the thermal smoke combined fire detector with smoke detector and temperature detector,
The thermal smoke combined fire detector, wherein the temperature detector is a non-contact temperature detector that is provided inside the sensor and measures the temperature of the inner surface of the sensor externally exposed surface from the inside. In the thermal smoke combined fire detector with smoke detector and temperature detector,
The temperature detection unit is provided inside the sensor,
A combined heat smoke fire detector, comprising a non-contact temperature detector and a self-temperature detector for measuring the temperature of the inner surface of the sensor externally exposed surface from the inside.   The thermal smoke combined fire detector according to claim 1 or 2, wherein the inner surface is a top surface of the smoke detector.   The hot smoke combined fire detector according to claim 3, wherein the top surface is made of carbon.   The thermal smoke combined fire detector according to claim 3 or 4, wherein the non-contact temperature detection unit is provided on a bottom surface side of the smoke detection unit.   The smoke detecting section includes a plurality of walls that prevent external light from entering the smoke detecting section, a light emitting element, and a light receiving element, and an opening that allows the top surface to be seen from the bottom surface. The thermal smoke combined fire detector according to claim 5, wherein a portion is formed in a field of view, and the non-contact temperature detection unit is disposed on the bottom surface.

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