JP2000132761A - Alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alarm which does not give so much incorrect information by uniting a gas alarm and a fire alarm and integrating and processing the signals of a gas sensor and a fire sensor. SOLUTION: This alarm contains a thermally sensitive sensor 11, a smoke sensor 13, a CO sensor 15 and a hydrocarbon sensor 17. An initial fire is discriminated when the thermally sensitive sensor detects heat that is equal to or more than threshold or when the smoke sensor detects smoke that is equal to or more than threshold, and an initial alarm is issued. A real fire is further discriminated when the CO sensor exceeds 1st threshold and, and a real alarm is issued. The initial alarm indicating the risk of fire breaking is issued to rouse the confirmation of the actual place involved, and when CO gas concentration further becomes higher than the 1st threshold in addition to this situation, the real alarm is issued, based on reliable information related to the fire occurrence.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention integrates a gas alarm and a fire alarm and integrates and processes signals from a gas sensor and a fire sensor, thereby reducing false alarms and simplifying handling. A good looking alarm.

[0002]

2. Description of the Related Art Conventionally, a gas alarm and a fire alarm have been separately installed, so that each function has been used independently.
Also, thermal and smoke types were used for fire alarms.

[0003]

When a thermal or smoke-type fire alarm is installed in a kitchen, if the temperature rises during cooking or a large amount of smoke is generated by burning fish, the fire alarm is activated. May activate and issue an alarm. If a fire alarm malfunctions in such a non-fire situation that can occur on a daily basis,
When a fire actually occurs, a warning may be overlooked by mistake and the response may be delayed. In addition, because of the two housings, not only the appearance was poor, but also installation work and maintenance had to be performed separately. Also, when a fire actually occurred, a gas alarm (gas leak, incomplete combustion) Alarm) was often activated, which was a false alarm.

[0004] The present invention has been made in view of such a problem, and by integrating a gas alarm and a fire alarm and integrating and processing signals from a gas sensor and a fire sensor, false alarms are generated. It aims to provide fewer alarms.

[0005]

Means for Solving the Problems To solve the above problems, an alarm device of the present invention comprises: a fire detection sensor; a sensor for detecting gas concentration; A judgment unit for judging fire and air contamination, and an alarm unit for issuing an alarm in accordance with the judgment unit, wherein the sensors and the units are arranged in an integral casing.

[0006] Further, the alarm according to the basic aspect of the present invention includes:
Equipped with a heat sensor or smoke sensor, and a CO sensor, the initial fire is determined when the heat sensor detects heat above the threshold or when the smoke sensor detects smoke above the threshold. Issue an alarm,
Further, it is characterized in that it is determined that a real fire has occurred when the CO sensor has exceeded the first threshold, and a full-scale alarm is issued. By issuing an initial warning that may cause a fire to alert the on-site confirmation, and in addition to this situation, issuing a full-scale fire alarm when the CO gas concentration becomes higher than the first threshold, A full-scale alert can be issued based on reliable information related to the occurrence.

[0007] Further, it is characterized in that it is determined that the air is dirty when the CO sensor exceeds the second threshold value, and an alarm is issued. By operating the gas alarm when a gas having a higher concentration than the gas generated at the beginning of the fire is generated, it is possible to prevent malfunction of the gas alarm at the beginning of the fire.

Preferably, the alarm is connected to a terminal of a security company or a gas company by wireless or wired means. Even if the site where the alarm is activated is unmanned, it is possible to reliably cope with it.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an alarm device according to one embodiment of the present invention. The alarm 1 includes four sensors: a heat sensor 11 and a smoke sensor 12 as fire sensors, and a CO gas sensor 15 and a hydrocarbon gas sensor 17 as gas sensors. The signal of each sensor is sent to a determination unit 21 composed of a microcomputer or the like.
The determination unit 21 processes signals from the sensors to determine an initial fire, a full-scale fire, a gas leak, incomplete combustion, and the like.
The result is displayed on the acoustic alarm unit 23 and the liquid crystal display unit 25.

Each sensor and judgment unit 21, alarm unit 23,
The display unit 25 is disposed in one housing. Alternatively, each sensor may be located outside the housing at a location where the substance to be detected is most likely to be present.

Examples of the thermal sensor include a temperature sensor such as a thermistor and a thermocouple, an infrared sensor, an ultraviolet sensor, and a pyroelectric sensor. Examples of the smoke sensor include an ionization type and a photoelectric type.

The main functions of the gas sensor provided in the alarm 1 are as follows. The CO sensor detects incomplete combustion of the combustion gas and CO gas generated in the early stage of the fire. The hydrocarbon sensor uses CH, which is the main component of city gas.
Detect leaks of ₄ and hydrocarbon gas generated at the beginning of fire. In addition, the following sensors may be provided. The O ₂ sensor detects incomplete combustion, oxygen deficiency, and a real fire. CO ₂ sensor, incomplete combustion, lack of oxygen,
Detect a real fire.

The gas sensor is mainly of the semiconductor type. 2A and 2B are diagrams showing the structure of the semiconductor gas sensor. FIG. 2A is a side sectional view of the sensor, and FIG. 2B is a perspective view showing details of the gas sensing unit. The sensitive portion 51 of the gas sensor 50 has a shape in which a pair of coils 53 and 53 ′ made of a noble metal wire (Ir-Pd alloy) are sandwiched between press-formed semiconductor sintered bodies (SnO ₂ ) 55. . One coil acts as a heater for heating the semiconductor 55 to about 400 ° C., and the other coil serves as an electrode for measuring the resistance of the semiconductor. The end of each coil is an element base 5
Through a nickel pin 59 that penetrates through 7, it is connected to a heating source and a resistance measuring unit. The gas sensing part 51 is covered with a cover 61 made of a double stainless steel wire mesh, and has a sufficient explosion-proof structure.

When the semiconductor (SnO ₂ ) is sintered at a high temperature, n
Shows mold semiconductivity. In air, oxygen captures free electrons near the surface, and is adsorbed as negative ions on the semiconductor surface. Therefore, an electron depletion layer is formed near the surface, and the semiconductor enters a high resistance state. On the other hand, if hydrogen, methane, or the like is present in the air, an oxidation reaction occurs on the semiconductor surface, and the adsorbed oxygen is consumed. As a result, the number of free electrons captured by oxygen increases, the electron depletion layer disappears, and the semiconductor enters a low resistance state. As described above, since the semiconductor resistance decreases exponentially due to gas adsorption, the amount of adsorbed gas can be estimated by measuring the voltage across the measurement electrode coil.

FIG. 3 is a flowchart for explaining an example of a judgment pattern of an initial fire and a full-scale fire. First, S21
In, the amount of heat detected by the thermal sensor is determined.
If the heat amount does not exceed the threshold value, the process proceeds to S23, and the amount of smoke detected by the smoke sensor is determined. If the amount of smoke exceeds the threshold value, the process proceeds to S22, where it is determined that the fire is an initial fire. Next, the process proceeds to S24, where the CO gas concentration detected by the CO sensor is determined. If the CO gas concentration exceeds the first threshold value, the process proceeds to S25, where it is determined that a real fire has occurred. The first threshold is 1
00 ppm.

FIG. 4 is a flow chart for explaining an example of a determination pattern of air contamination and a real fire. First, S4
In step 1, the CO concentration detected by the CO sensor is determined, and if the CO concentration exceeds the first threshold, the process proceeds to S42,
Judge the amount of heat detected by the thermal sensor. The first threshold is 100 ppm. If the heat exceeds the threshold, S4
Proceed to 3 and determine that it is a real fire. If the heat amount is equal to or less than the threshold value, the process proceeds to S44, and the amount of smoke detected by the smoke sensor is determined. When the amount of smoke exceeds the threshold, the process proceeds to S43,
Judge as a real fire. If the amount of smoke does not exceed the threshold, the process proceeds to S45, where the CO concentration detected by the CO sensor is determined. When the CO concentration exceeds the second threshold, S46
To determine that the air is dirty. The second threshold is 250
ppm.

The sound alarm unit 23 emits audio information indicating the contamination of the air, the initial fire, and the full-scale fire determined according to the above-described determination pattern. The determination unit 21 has a built-in memory, and stores these pieces of information. Information is stored in word units, and these are combined to form one piece of audio information. That is, the words are "incomplete combustion", "leak gas", "fire", "smoke"
"High temperature""Danger of dirty air""Is.""Ventilation"
"Confirm", "evacuate", "please".

The voice information that informs the user of air contamination due to an increase in the CO gas concentration is “danger of air contamination”, “is dangerous”, “confirm”, “please”. "Yes.""Check""Please." In case of a real fire, "Fire""Yes.""Evacuation""Please." As described above, by using a part of the words included in each voice information in common, the amount of information stored in the memory can be reduced.

The alarm 1 may be connected to a terminal of a security company or a gas company wirelessly or by wire such as a telephone line. In this case, a signal from each sensor and information on an alarm issuance are transmitted to the terminal. Therefore, after an alarm is issued by an acoustic alarm or a liquid crystal display, if the value of each sensor continues to increase even if a predetermined time has elapsed, or if the alarm is not canceled, a treatment can be performed from a place other than the site. .

[0020]

As is apparent from the above description, the present invention integrates a gas alarm and a fire alarm, and integrates and processes signals from a gas sensor and a fire sensor to obtain gas leakage and fire. Since an alarm can be issued based on reliable information about the alarm, an alarm device with less false alarm can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an alarm device according to one embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a semiconductor gas sensor;
FIG. 2A is a side sectional view of the sensor, and FIG. 2B is a perspective view showing details of the gas sensing unit.

FIG. 3 is a flowchart illustrating an example of an initial fire and full-scale fire determination pattern.

FIG. 4 is a flowchart illustrating an example of a determination pattern of air contamination and a real fire.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Alarm 11 Thermal sensor 13 Smoke detection sensor 15 CO sensor 17 Hydrocarbon sensor 21 Judgment part 23 Audio alarm part 25 Liquid crystal display part 50 Gas sensor 51 Sensing part 53 Coil 55 Semiconductor 57 Element stand 59 Nickel pin 61 Cover

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G08B 21/16 G08B 21/00 617 (72) Inventor Taeko Honjo 3-28-70 Minamisenju, Arakawa-ku, Tokyo (72) Inventor Tatsuo Fujimoto 3-2-10 Kishitani, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Yukio Koshiba 1-3-1-218, Haraki, Ichikawa-shi, Chiba F-term (reference) 2G046 AA11 BA02 BB02 BC03 BE02 BF05 BJ10 DC09 DC12 DC14 DD04 FB02 FE39 2G060 AA02 AA03 AB05 AB08 AB09 AB17 AE09 AE11 AE19 AE33 AE34 AE40 AF09 AG03 BA01 BB09 HC18 HD01 HD02 5C085 AA01 AA03 AA06 AA07 AA13 AA14 AB09 BA12 DA03 BA01 CA05 CA06 CA09 DA21 DA22

Claims (4)

[Claims] 1. A fire detection sensor, a sensor for detecting a gas concentration, a signal input from the sensor, a judgment unit for judging an initial fire, a full-scale fire, and air contamination, and a judgment unit An alarm unit for issuing an alarm, wherein the sensors and the units are arranged in an integral casing. 2. An initial fire, comprising a heat sensor or a smoke sensor and a CO sensor, wherein the heat sensor detects heat above a threshold or the smoke sensor detects smoke above a threshold. The alarm device according to claim 1, wherein an alarm is issued, an initial alarm is issued, and furthermore, a real fire is determined when the CO sensor exceeds the first threshold value, and a full alarm is issued. . 3. The alarm device according to claim 1, wherein when the CO sensor exceeds the second threshold value, it is determined that the air is dirty, and an alarm is issued. 4. The alarm device according to claim 1, wherein the alarm device is connected to a terminal of a security company or a gas company by wireless or wired means.