JP3435680B2 - Gas alarm - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device, and more particularly, to a gas alarm device which issues an alarm when the concentration of a predetermined gas reaches or exceeds a predetermined concentration. 2. Description of the Related Art Conventionally, in a gas alarm of this type, a semiconductor type gas sensor, a contact combustion type gas sensor or the like is usually used as a gas sensor. The power consumption of the contact combustion type gas sensor and the semiconductor type gas sensor is about 600 mW (current consumption of 300 mW).
mA), the gas alarm was often connected externally to a commercial AC power supply (AC100V) for use. However, when it is required to provide a gas alarm at an installation location where connection and wiring to a commercial AC power supply is difficult or where an aesthetic appearance is important,
Since it is difficult to use an external commercial AC power supply, a battery power supply such as a lithium battery is built in the gas alarm device instead of the external commercial AC power supply, and the gas sensor is driven using the battery power supply. [0005] However, in such a built-in battery type gas alarm, a contact combustion type gas sensor or a semiconductor type gas sensor is driven using a lithium battery having a relatively large battery capacity of 2700 mAh. Even in this case, the consumption current of these gas sensors is 50 mA.
Even if it is used for about 50 hours (about 2 days), the life of the battery is extended, so that there is a technical problem that it is difficult to realize a gas alarm that can be used practically. SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem and to detect the concentration of carbon monoxide gas.
A contact combustion type CO sensor for knowledge, a battery power supply for supplying operating power to said catalytic combustion type CO sensor, the catalytic combustion type
Emit carbon monoxide gas, which is the detection target of the CO sensor
It detects the operating state of the gas combustion equipment Gas combustion devices ON /
ON / OFF signal of the relay that operates in response to OFF
A motion detection means for generating a Ranaru operating state detection signal, in response to the operating state detection signal, detects the start timing of the gas combustion device generates a power connection signal, also the gas combustion <br/> equipment Power supply control means for detecting a stop time of the power supply and generating a power supply disconnection signal, and the catalytic combustion type according to the power supply connection signal.
A control for connecting a CO sensor to the battery power supply to make it operable is performed, and the contact is performed in response to the power-off signal.
By providing a power supply interrupting means for executing control for disconnecting the combustion type CO sensor from the battery power supply and stopping the combustion, the current consumption of the contact combustion type CO sensor can be reduced and the battery life can be extended. As a result, it is an object of the present invention to realize a gas alarm which has a long operation time and can withstand practical use. In addition, as a result of realizing a gas alarm with a built-in battery that can operate for a long time and is practical, gas that can be installed in places where it is difficult to connect and connect with a commercial AC power supply or in places where beauty is important The task is to realize an alarm. According to a first aspect of the present invention, there is provided a catalytic combustion type CO sensor for detecting a concentration of carbon monoxide gas, and an operating power is supplied to the catalytic combustion type CO sensor. a battery power source 21 to the gas fuel for discharging carbon monoxide gas as a detection target of the catalytic type CO sensor 18
ON / O of gas combustion equipment by detecting the operating state of the baking equipment 22
From the ON / OFF signal of the relay that operates in response to the FF
Operation detecting means 1 for generating consisting operating state detection signal 13a
And 3B, depending on the operating state detection signal 13a, the moth
The power supply connection signal 12
a power control means 12 for generating a power cut-off signal 12b by detecting a stop time of the gas combustion equipment 22.
And the catalytic combustion type C according to the power connection signal 12a.
The O 2 sensor 18 is connected to the battery power source 21 performs a control to operable state, and the said catalytic combustion type CO sensor 18 in response to the power down signal 12b battery power source 21
The gas alarm device 10 further includes a power supply intermittent unit 14 that executes control for disconnecting the power supply from the power supply and stopping the operation. According to the first aspect of the present invention, motion detection
By providing the means 13B, the power control means 12 and the power intermittent means 14 , the operation detecting means 13B
ON of the gas combustion equipment that detects and generates the operation state of 22
ON / OFF signal of the relay that operates in response to / OFF
The operation state of the gas combustion equipment 22 is monitored by the operation state detection signal 13a, and the contact combustion CO sensor 18 is limited to the time between the start time and the stop time of the gas combustion equipment 22.
There is an effect that control for supplying operating power from the battery power supply 21 can be executed. As a result, catalytic combustion
Results that can reduce current consumption of formula CO sensor 18, the current consumption excellent discrimination performance and detection accuracy of the gas large catalytic type
Even when the CO sensor 18 is used, the battery power supply 21
The life of the gas alarm device 10 can be extended, and the gas alarm device 10 having a long operation time and practical durability can be realized. In this way, the gas alarm 10 with a built-in battery that can be used for a long time and can be used practically can be realized. As a result, installation in a location where connection and wiring with a commercial AC power supply is difficult or where aesthetics are valued is important. Gas alarm 1 with excellent gas discrimination performance and detection accuracy
0 can be realized. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of a gas alarm 10 of the present invention will be described with reference to the drawings. [0010] Figure 1 is a circuit diagram for explaining an implementation form of gas detector 10 of the present invention. The gas alarm device 10 shown in FIG. 1 has an alarm function for issuing an alarm when the concentration of carbon monoxide gas has reached a predetermined concentration or higher. The gas alarm 18, the sensor power supply 21, the temperature detection means 13 A and the power supply The control unit 12 is mainly configured. In the present embodiment, a carbon monoxide gas is assumed as the carbon monoxide gas, a bath pot 22 is assumed as the gas combustion device 22, and a CO gas alarm device 10 for detecting the carbon monoxide gas is assumed as the gas alarm device 10. The following description will be made on the assumption that The gas sensor 18 is a catalytic combustion type gas sensor and has a function of detecting the concentration of gas poisoning of carbon monoxide (CO) gas. In the present embodiment, it is desirable to use a semiconductor gas sensor 18 having excellent gas discrimination performance and detection accuracy. Hereinafter, the gas sensor 18 will be represented by the semiconductor gas sensor 18. As a result, the current consumption of the semiconductor gas sensor 18 can be reduced. As a result, the life of the battery power supply 21 can be extended even when the semiconductor gas sensor 18 having excellent gas discrimination performance and detection accuracy and large current consumption is used. As a result, the CO gas alarm device 10 having a long operation time and enduring practical use can be realized. In this way, a CO gas alarm 10 with a built-in battery that can be used for a long time and that can be put to practical use can be realized. There is an effect that it is possible to realize the CO gas alarm device 10 that is excellent in gas discrimination performance and detection accuracy that can be installed. A sensor power supply 21 shown in FIG. 1 is a power supply for supplying operating power to the semiconductor gas sensor 18, and a commercial AC power supply (100V AC) or a battery power supply can be used. In this embodiment, a lithium battery is used as the battery power supply 21. In this case, the lithium battery 21 is built in the CO gas alarm 10, and the semiconductor gas sensor 18 is driven using the battery power supply 21. Hereinafter, the sensor power supply 21 will be represented by the lithium battery 21.
The battery capacity of the lithium battery 21 is about 2700 mAh. As described above, since the lithium battery 21 is used, the operation time is long and the battery built-in CO
As a result of realizing the gas alarm device 10, it is possible to realize a compact CO gas alarm device 10 that can be installed at an installation location where connection and wiring with a commercial AC power supply is difficult or at an installation location where aesthetics are valued. It has the effect of becoming The operation detecting means 13B is a semiconductor gas sensor.
Bath that emits carbon monoxide gas that is detected by
An external output signal 13b is generated according to the operation state of the shuttle 22.
In this embodiment, the ON / OFF of the combustor is provided.
The relay ON / OFF signal that operates in response to
Used as the force signal 13b. In this case, the power supply control means 12 supplies the external output
According to the signal 13b, the start timing of the bath kettle 22 is detected.
Generates power supply connection signal 12a and stops bath kettle 22 again
Has the function of detecting the
I have. The power supply intermittent means 14 shown in FIG. 1 executes a control for connecting the semiconductor gas sensor 18 to the lithium battery 21 to make it operable according to the power supply connection signal 12a.
Also, the semiconductor gas sensor 18 responds to the power-off signal 12b.
Has a function of executing a control of disconnecting the battery from the lithium battery 21 and bringing the battery into a stop state. More specifically, the power supply intermittent means 14 includes switching transistors Q1 and Q2 each having a semiconductor gas sensor 18 connected as a collector load, and each base connected to an output terminal of the power supply control means 12, and a peripheral resistor. It is configured. In this case, the switching transistors Q1 and Q2 are activated in response to the power supply connection signal 12a. As a result, the semiconductor gas sensor 18 is connected to the lithium battery 21 and becomes operable. Similarly, power off signal 1
In response to 2b, the switching transistors Q1 and Q2 are deactivated, and as a result, the semiconductor gas sensor 18 is disconnected from the lithium battery 21 to be in a stopped state. [0022] Depending on the provision of such power supply control unit 12 and the power supply interrupting means 14, executes a control for supplying operating power from the lithium battery 21 to the semiconductor gas sensor 18 is limited between the stop time and the startup period It has the effect of being able to do so. As a result, the semiconductor gas sensor 18
Thus, it is possible to reduce the current consumption. The power supply control means 12 responds to the output signal 18a of the semiconductor gas sensor 18 with an alarm signal 1 indicating that the gas poisoning concentration of the carbon monoxide gas has exceeded the gas poisoning concentration.
2c is generated. According to this, it is possible to detect a harmful gas such as carbon monoxide which has a bad influence on the human body and to notify the danger. The alarm means 16 has a function of generating an alarm by generating a buzzer sound or blinking an LED in response to the alarm signal 12c. FIG. 2 is a flowchart for explaining the operation of the gas alarm 10 of FIG. When the power of the gas alarm device 10 is turned on (step P1), the temperature detecting means 13A is externally operated according to the operation state of the bath kettle 22 for discharging carbon monoxide gas to be detected by the semiconductor gas sensor 18. An output signal 13b is generated (Step P2). Subsequently, when the power supply control means 12 detects the ON voltage of the external output signal 13b ([ON] in step P2), it determines that the combustor has ignited and generates a power supply connection signal 12a. When the power control means 12 detects the OFF voltage of the external output signal 13b (step P2).
[OFF]), it judges that the combustor has extinguished, and generates a power-off signal 12b. Subsequently, the power supply interrupting means 14 executes control for connecting the semiconductor gas sensor 18 to the lithium battery 21 to make it operable in accordance with the power supply connection signal 12a (step P3), and the power supply disconnection signal 12b. Then, control is performed to disconnect the semiconductor gas sensor 18 from the lithium battery 21 and bring it into a stopped state (step P2A). Subsequently, when the power supply control means 12 determines that the output signal 18a of the semiconductor gas sensor 18 is equal to or more than a predetermined value ("above setting" in step P4), the gas poisoning concentration of the carbon monoxide gas is reduced. An alarm signal 12c indicating that the gas poisoning concentration has been reached is generated. Subsequently, the alarm means 16 outputs the alarm signal 12c.
(Step P5). According to the first aspect of the present invention, by providing the power supply control means and the power supply intermittent means, gas combustion is achieved.
Monitor the operating status of the equipment, and start and stop gas-fired equipment.
Battery power supply for catalytic combustion type CO sensor only during stop time
Control to supply operating power from
It has such an effect. As a result, the catalytic combustion type CO sensor
Current consumption can be reduced, resulting in longer battery life
Can be used for a long time
Gas alarm can be realized
It works. Reduces current consumption of catalytic combustion type CO sensor
As a result, it has excellent carbon monoxide gas discrimination performance and detection accuracy.
Using a contact combustion type CO sensor with large current consumption
Battery life can be extended
Gas with built-in battery that can be used for a long time
As a result of realizing the alarm, the connection wiring with the commercial AC power
Places that are difficult or places that value aesthetics
To provide a carbon monoxide gas alarm that can be installed
This has the effect of being able to perform

It is a circuit diagram for explaining an implementation form of gas detector BRIEF DESCRIPTION OF THE DRAWINGS [Figure 1] present invention. FIG. 2 is a flowchart for explaining the operation of the gas alarm of FIG. 1; DESCRIPTION OF SYMBOLS 10 Gas alarm 12 Power supply control means 12a Power supply connection signal 12b Power off signal 12c Alarm signal 13 Temperature detection means 13a Temperature signal 14 Power supply intermittent means 16 Alarm means 18 Gas sensor (semiconductor gas sensor) 21 Battery 22 Gas cooker

Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G08B 21/16 G01N 27/00 G08B 21/00

Claims (1)

(57) [Claims] [Claim 1] Catalytic fuel for detecting the concentration of carbon monoxide gas
And baked type CO sensors, gas emissions and battery electric <br/> source for supplying operating power to said catalytic combustion type CO sensors, carbon monoxide <br/> gas as a detection target of the catalytic type CO sensor Detects the operating state of combustion equipment and detects gas
ON of the relay that operates according to ON / OFF of the baking equipment
/ A motion detection means for generating an operation state detection signal consisting OFF signal, in response to the operating state detection signal, generates a power connection signal by detecting a starting timing of the gas combustion apparatus, and the gas fuel
Power supply control means for detecting a stop time of the baking equipment and generating a power supply disconnection signal; and executing control for connecting the contact combustion type CO sensor to the battery power supply and operable according to the power supply connection signal. And a power interrupting means for executing a control for disconnecting the catalytic combustion type CO sensor from the battery power supply and stopping the operation in response to the power disconnection signal.