JP2001165896A - Carbon monooxide detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect incomplete combustion with high precision, using a carbon monoxide sensor. SOLUTION: The temperature characteristic of a solid electrolyte plate 11 determining the carbon monoxide detecting characteristic of the sensor 17 is optimized by regulating electric power supplied to a heater 15 for heating. The voltage between the electrodes 12, 13 of the sensor 17 with the information of the carbon monoxide concentration of a burning apparatus reflected is amplified by an amplifier 19. The output of the amplifier 19 is compared with a constant voltage value preset with a comparative voltage setting means 21, using a voltage comparator 20. If it is large, an instruction of burning stop is issued to a plurality of burning apparatuses by a burning apparatus stop instructing means 22, thereby preventing a danger of carbon monoxide poisoning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon monoxide detector for detecting incomplete combustion of a combustion device.

[0002]

2. Description of the Related Art In the conventional incomplete combustion detection, the information of sensors installed in individual combustion devices is integrated to control the devices, thereby ensuring the safety of the combustion devices (see Japanese Patent Application Laid-Open No. 11-51383). . In FIG. 12, the combustion state is detected by the carbon monoxide sensor 3 or the oxygen sensor 4 installed in the exhaust stack 2 of the gas water heater 1, information is loaded on the information bus 5, and other gas equipment (here, the gas table 6) Is also put on the information bus 5. The information on the information bus 5 is also compared with the flow rate information of each gas appliance by the microcomputer meter 7 to identify the gas appliance causing incomplete combustion, cut off gas to the gas appliance, or issue an alarm. Was something.

[0003]

However, in the conventional incomplete combustion detection control shown in FIG. 12, it is necessary to mount a sensor for each combustion device, and in order to ensure safety, the number of sensors is equal to the number of the combustion devices. This increases the number of sensors and increases the cost. In addition, since gas combustion equipment is centrally managed by a microcomputer meter, it is possible to shut off gas supply when incomplete combustion is detected. Could not respond.

[0004] Further, the sensor must constantly monitor carbon monoxide, the standby power becomes large, and there is a problem in terms of energy saving.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a solid electrolyte body having oxygen ion conductivity and having a pair of electrodes on its surface and a heating means for the solid electrolyte body. A carbon monoxide sensor provided on one side of the ceramic body and the electrode and provided with a carbon monoxide oxidation catalyst layer, and a heating power adjusting means for adjusting the heating power of the heating means of the solid electrolyte body, which is provided separately from the combustion equipment. Amplifying means for amplifying the voltage between the electrodes of the carbon monoxide sensor, voltage comparing means for comparing the output value of the amplifying means with a constant voltage value, and means for instructing combustion stop of a plurality of combustion devices by the output of the voltage comparing means. It has.

In this method, the concentration of a carbon monoxide sensor is detected by a single carbon monoxide sensor installed in a space (living room, kitchen, etc.) that is affected by the exhaust gas of a plurality of combustion equipment, and the concentration of monoxide is equal to or higher than a certain value. When detecting the carbon sensor concentration,
It stops combustion of a plurality of combustion devices and safely controls the combustion devices.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a solid electrolyte body having oxygen ion conductivity and having a pair of electrodes on its surface, a ceramic body provided with a heating means for the solid electrolyte body, and one side of the electrode. A carbon monoxide sensor provided with a carbon oxide oxidation catalyst layer and installed separately from the combustion equipment; heating power adjusting means for adjusting the heating power of the heating means for the solid electrolyte body; and a voltage between the electrodes of the carbon monoxide sensor Amplifying means for amplifying the voltage, voltage comparison means for comparing the output value of the amplification means with a constant voltage value,
Stop instruction means for instructing combustion stop instructions for a plurality of combustion devices is provided by the output of the voltage comparison means, and the combustion stop instruction can be controlled by one carbon monoxide sensor.

Also, a solid electrolyte body having oxygen ion conductivity and having a pair of electrodes on its surface, a ceramic body provided with a heating means for the solid electrolyte body, and a carbon monoxide oxidation catalyst layer provided on one side of the electrode. A carbon monoxide sensor that is configured and installed separately from the combustion equipment, combustion determination means for determining the operation of the combustion equipment, and heating power adjustment for adjusting the heating power of the heating means for the solid electrolyte body by the output of the combustion determination means Means, amplifying means for amplifying the voltage between the electrodes of the carbon monoxide sensor element portion,
A voltage comparing means for comparing an output value of the amplifying means with a constant voltage value; and a stop instructing means for instructing a stop of combustion of a plurality of combustion devices by an output of the voltage comparing means. The detection output of the carbon monoxide sensor can be optimally set and controlled in accordance with the conditions.

Further, when the combustion judging means for judging the operation of the combustion equipment judges that the combustion equipment is operating, the heating electric power is increased by the heating electric power adjusting means, and when it is judged that the combustion equipment is not operating, the heating electric power is adjusted. The heating power is reduced to a low power by means, and high sensitivity operation can be performed when the combustion equipment is operating, and high output operation can be performed when the combustion equipment is not operating.

When the combustion judging means for judging the operation of the combustion equipment judges that the combustion equipment is operating, the heating electric power is increased by the heating electric power adjusting means, and when it is judged that the combustion equipment is not operating, the heating electric power is adjusted. The heating power is reduced by the heating means and when the voltage of the amplification means exceeds a predetermined value, the heating power is increased by the heating power adjusting means. Regardless, carbon monoxide can be detected with appropriate sensitivity.

A solid electrolyte body having oxygen ion conductivity and having a pair of electrodes on its surface, a ceramic body provided with a heating means for the solid electrolyte body, and a carbon monoxide oxidation catalyst layer provided on one side of the electrode. A carbon monoxide sensor configured and installed separately from the combustion equipment, a combustion determination means for determining the operation of the combustion equipment, a transmission means for wirelessly transmitting an output of the combustion determination means, a reception means for receiving, and a reception means. Heating power adjusting means for adjusting the heating power of the heating means for the solid electrolyte body by a signal, amplifying means for amplifying the voltage between the electrodes of the carbon monoxide sensor, and voltage comparing means for comparing the output value of the amplifying means with a constant voltage value And a device for instructing a plurality of devices to stop the combustion by the output of the voltage comparing device. Even if the combustion device and the carbon monoxide sensor element are separated from each other, the combustion stop finger of the combustion device may be provided. It can be carried out.

Further, at least the combustion determining means for determining the operation of the combustion equipment and the driving power supply other than the transmitting means for wirelessly transmitting the output of the combustion determining means are constituted by batteries, and the power supply is constituted by batteries. Accordingly, it is possible to install the sensor in a place where there is no AC power supply, and it is possible to increase the degree of freedom of the installation place.

Further, the heating power adjusting means has a heating voltage measuring means, a heating current measuring means and a power calculating means, and the power can be known from the voltage and the current value.

Further, the apparatus has resistance calculating means for calculating the resistance value of the heating means of the solid electrolyte body from the heating voltage measuring means and the heating current measuring means, so that the resistance value of the heating means can be known.

Further, the heating means of the solid electrolyte body is set at 350 ° C. to 400 ° C. at the time of low power operation of the heating power adjusting means, and at 450 ° C. to 500 ° C. at the time of high power operation. A sensor can be set for the state.

An embodiment of the present invention will be described below with reference to FIGS.

[0017]

(Embodiment 1) FIG. 1 is a configuration diagram of a carbon monoxide detector according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 11 denotes 400 ° C. to 500 ° C.
A solid electrolyte plate having oxygen ion conductivity under high temperature of
A pair of electrodes 12 and 13 are provided on the surface, and these electrodes 12 and 13 are formed by electron beam evaporation, sputtering, or thick film printing. A platinum electrode is usually used as the electrode.

Reference numeral 14 denotes a ceramic paper impregnated and held with a carbon monoxide oxidation catalyst (the drawing is partially cut away), and has air permeability and covers the electrode 12.
Reference numeral 15 denotes a heater formed on the surface of the ceramic plate 16 by vapor deposition or printing.
1 and the ceramic paper 14 are heated to operate as a carbon monoxide sensor. A carbon monoxide sensor 17 is constituted by the solid electrolyte plate 11, the ceramic plate 16, and the ceramic paper 14, and is installed separately from the combustion equipment. The applied voltage and current of the heater 15 are controlled by the heating power adjusting means 18, and the power applied to the heater 15 is controlled. The heating temperature changes due to the difference in the power of the heater 15, and the carbon monoxide sensor element 1
7 as the output of the electrodes 12 and 13 as a difference in the carbon monoxide detection characteristics.

FIG. 2 shows the relationship between the sensor output and the concentration of carbon monoxide. If the temperature is too low, the output is large, but the detection takes a long time, and the adsorption of the carbon monoxide gas to the surfaces of the electrodes 2 and 3 occurs, so that the operation as the carbon monoxide sensor is not guaranteed. When the temperature increases, the output decreases, but the carbon monoxide gas does not adsorb to the surfaces of the electrodes 2 and 3, and the sensitivity is improved. The optimal temperature range is around 350 ° C to 550 ° C
It is about.

The outputs of the electrodes 12 and 13 are connected to the amplifier 1
9, the output of the amplifier 19 is connected to one of the input terminals of a voltage comparator 20, and the other input terminal of the voltage comparator 20 is a comparison voltage for setting a voltage value corresponding to the concentration of carbon monoxide to be detected. The output of the setting means 21 is connected. The output of the voltage comparator 20 is connected to the combustion equipment stop instructing means 22, and the output of the combustion equipment stop instructing means 22 is a predetermined number (three in the figure) of the combustion equipments 23, 24,
It is connected to 25.

First, the operation of the carbon monoxide sensor having the above configuration will be described. The carbon monoxide gas that has passed through the ceramic paper 14 is oxidized when passing through the ceramic paper 14 and does not reach the electrode 12. Therefore, in the vicinity of the electrode 12 in the solid electrolyte plate 11, the oxygen atom adsorbed on the electrode 12 is ionized by the reaction represented by the formula (1).

[0023] O + 2e ^- → O ^2- formula (1) On the other hand, in the vicinity of the electrode 13 in addition to the reaction represented by the formula (1), are shown because the carbon monoxide gas comes reached in Equation (2) reacting Is also happening.

CO + O ²⁻ → CO 2 + 2e ⁻ Equation (2) Then, a potential difference is generated between the electrodes 12 and 13 due to a difference in reaction between the electrodes 12 and 13 of the solid electrolyte plate 11. That is, the potential difference changes according to the concentration of carbon monoxide, and the device operates as a carbon monoxide sensor.

The heater 15 is a heat source for heating the solid electrolyte plate 11 and the ceramic paper 14 to a constant temperature so that the reactions of the formulas (1) and (2) occur stably.

When the concentration of carbon monoxide increases, the amplifier 19
Rises and the voltage value becomes higher than the output of the comparison voltage setting means 20, the output of the voltage comparator 20 becomes HIG.
It becomes H, and gives an instruction to the combustion equipment stop instruction means 22 to issue a combustion stop signal of the equipment. The combustion equipment stop instruction means 22 sends a combustion stop instruction to the combustion equipment 23, 24, 25, and the relay contacts 26, 27, 28 of the individual equipment are opened.

With this configuration, when an abnormal carbon monoxide concentration is detected by a single carbon monoxide sensor, a plurality of combustion devices that may be causing incomplete combustion are simultaneously stopped, and the poisoning of carbon monoxide is stopped. Can be prevented beforehand.

It should be noted that instead of the ceramic paper 14, a carbon monoxide oxidizing catalyst may be held and a material having air permeability may be used. For example, even if a fibrous metal is used, the effect is not changed. The same applies to the following embodiments.

(Embodiment 2) FIG. 3 is a configuration diagram of a carbon monoxide detector according to Embodiment 2 of the present invention.

The difference between the second embodiment and the first embodiment is that the combustion equipment 2
That is, the output of the heating power adjusting means 18 for adjusting the power to the heater 15 is changed according to the output of the combustion judging means 29 for judging the operations of 3, 24 and 25. When the combustion equipment is not operating, the temperature of the heater 15 is lowered to increase the output, and when the combustion equipment is operating, the temperature is increased and the output is reduced, but the sensitivity is increased to operate. In this way, when any of the combustion devices 23, 24, and 25 is operating, the heater 15 is not operated.
Power to be supplied can be optimally controlled.

FIG. 4 is a flowchart of the control according to the second embodiment of the present invention. When any one of the combustion devices 23, 24, and 25 is operating, the heating power adjusting means 18 controls the heater 15.
Is heated with high power and low power when not operating.

(Embodiment 3) FIG. 5 is a flowchart of another control in Embodiment 2 of the present invention.

When any of the combustion devices 23, 24 and 25 is operating, the heater 15 is heated by the heating power adjusting means 18 with high power. When the operation is not in operation, when the output of the comparison voltage setting means 21 is HIGH, it is determined that there is a possibility that some carbon monoxide has already been emitted, and the heating power adjustment means 1
At 8, the heater 15 is heated with high power. When the output of the comparison voltage setting means 21 is not HIGH, the heater 15 is heated by the heating power adjusting means 18 with low power.

(Embodiment 4) FIG. 6 is a configuration diagram of a carbon monoxide detector according to Embodiment 4 of the present invention. The output of the combustion determining means 29 is wirelessly transmitted by the transmitting means 30 to the receiving means 31.
And the output signal of the receiving means 31 is
8 and the heater 15 is heated with appropriate electric power. An installation place can be freely set for transmitting and receiving signals wirelessly, and a carbon monoxide sensor can be installed at an optimum position.

(Embodiment 5) FIG. 7 is a configuration diagram of a carbon monoxide detector according to Embodiment 5 of the present invention. By using the battery 32 as the driving power source, the battery can be installed even in a place where there is no power outlet, and the degree of freedom of installation is greatly increased.

(Embodiment 6) FIG. 8 is a block diagram of the heating power adjusting means 18 according to Embodiment 6 of the present invention. The heating power adjusting means 18 includes a heating voltage measuring means 33, a heating current measuring means 34, and a power calculating means 35. The product of the outputs of the heating voltage measuring means 33 and the heating current measuring means 34 is obtained by the power calculating means 35. , The power applied to the heater 15 is calculated.

(Embodiment 7) FIG. 9 is a configuration diagram of the heating power adjusting means 18 in Embodiment 7 of the present invention. The heating power adjusting means 18 includes a heating voltage measuring means 33, a heating current measuring means 34, and a resistance calculating means 36. The quotient of the outputs of the heating voltage measuring means 33 and the heating current measuring means 34 is obtained by the resistance calculating means 36. , The resistance value of the heater 15 can be known.

The resistance and the temperature of the heater 15 have a relationship as shown in FIG. 10, and the heater 15 can be maintained at a constant temperature by controlling the resistance of the heater 15 to be constant.

(Embodiment 8) FIG. 11 is a graph showing the relationship among temperature, sensor output, and carbon monoxide concentration.

In a state where the concentration of carbon monoxide is low, it is effective to lower the temperature and set a low output in which the output is large.
On the other hand, when the concentration becomes high, the temperature is raised to a high output setting, thereby preventing the characteristics of the carbon monoxide gas sensor from deteriorating due to the adsorption of the electrode and carbon monoxide.
Therefore, the heating temperature suitable for obtaining a proper output is 350 ° C. to 400 ° C. on the low output side and 450 ° C. to 500 ° C. on the high output side.

[0041]

The present invention is embodied in the form described above and has the following effects.

(1) By switching the heating power of the heater, a carbon monoxide sensor having high sensitivity at a low concentration and high reliability at a high concentration can be manufactured.

(2) By controlling the heater power in conjunction with the operation of the combustion equipment, the sensor can be operated with an optimum sensitivity corresponding to the risk of carbon monoxide generation.

(3) By transmitting the combustion determination signal of the control device wirelessly, the degree of freedom of the installation location of the sensor is improved.

(4) Since the power supply of the sensor portion is driven by a battery, it can be installed in a place where there is no outlet, and the degree of freedom of installation is further improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a carbon monoxide detection device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a sensor output and a carbon monoxide concentration in Embodiment 1 of the present invention.

FIG. 3 is a configuration diagram of a carbon monoxide detection device according to a second embodiment of the present invention.

FIG. 4 is a flowchart of control in Embodiment 2 of the present invention.

FIG. 5 is a flowchart of another control according to the second embodiment of the present invention.

FIG. 6 is a configuration diagram of a carbon monoxide detection device according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram of a carbon monoxide detector according to Embodiment 6 of the present invention.

FIG. 8 is a configuration diagram of a heating power adjusting unit according to a seventh embodiment of the present invention.

FIG. 9 is a configuration diagram of a heating power adjusting unit according to an eighth embodiment of the present invention.

FIG. 10 is a diagram showing a relationship between resistance and temperature in Embodiment 9 of the present invention.

FIG. 11 is a diagram showing a relationship among temperature, sensor output, and carbon monoxide concentration in Embodiment 9 of the present invention.

FIG. 12 is a configuration diagram of a conventional incomplete combustion detection control system in a gas combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Solid electrolyte board 12, 13 electrode 14 Ceramic paper (carbon monoxide oxidation catalyst layer) 15 Heater 16 Ceramic board 17 Carbon monoxide sensor element part 18 Heating power adjustment means 19 Amplifier 20 Voltage comparator 21 Comparison voltage setting means 22 Combustion equipment Stop instructing means 23, 24, 25 Combustion equipment 26, 27, 28 Relay contact 29 Combustion determining means 30 Transmitting means 31 Receiving means 32 Battery 33 Heating voltage measuring means 34 Heating current measuring means 35 Power calculating means 36 Resistance calculating means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsuhiko Uno 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Kunihiro Tsuruta 1006 Kadoma Kadoma Kadoma City, Osaka Prefecture 72) Inventor Takahiro Umeda 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. 2G004 BB04 BC03 BE12 BE22 BF12 BF22 BJ02 BL08 BM01

Claims (9)

[Claims] 1. A solid electrolyte body having oxygen ion conductivity and having a pair of electrodes on its surface, a ceramic body provided with a heating means for said solid electrolyte body, and a carbon monoxide oxidation catalyst layer on one side of said electrode A carbon monoxide sensor that is configured and installed separately from the combustion equipment, a heating power adjustment unit that adjusts heating power of the heating unit of the solid electrolyte body, and a voltage between electrodes of the carbon monoxide sensor element unit. Carbon monoxide comprising: amplifying means for amplifying; voltage comparing means for comparing an output value of the amplifying means with a constant voltage value; and stop instruction means for instructing to stop combustion of a plurality of combustion devices by an output of the voltage comparing means. Detection device. 2. A solid electrolyte body having oxygen ion conductivity and having a pair of electrodes on its surface, a ceramic body provided with a heating means for said solid electrolyte body, and a carbon monoxide oxidation catalyst layer on one side of said electrode. A carbon monoxide sensor that is configured and installed separately from the combustion equipment, combustion determination means for determining the operation of the combustion equipment, and the heating power of the heating means for the solid electrolyte body is adjusted by the output of the combustion determination means. Heating power adjusting means, an amplifying means for amplifying a voltage between the electrodes of the carbon monoxide sensor, a voltage comparing means for comparing an output value of the amplifying means with a constant voltage value, and a plurality of outputs by the output of the voltage comparing means. A carbon monoxide detector having stop instruction means for instructing the combustion equipment to stop burning. 3. The heating power adjusting means increases the heating power when the combustion equipment is determined to be operating, and the heating power is adjusted when the combustion equipment is determined not to be operating. 3. The carbon monoxide detector according to claim 2, wherein the heating power is reduced by the means. 4. The heating power is increased by heating power adjusting means when the combustion equipment is determined to be operating by the combustion determining means for determining the operation of the combustion equipment, and the heating power is determined when the combustion equipment is determined not to be operating. 3. The carbon monoxide detector according to claim 2, wherein the heating power is reduced by the power adjusting means, and the heating power is increased by the heating power adjusting means when the voltage of the amplifying means exceeds a predetermined value. 5. A solid electrolyte body having oxygen ion conductivity and having a pair of electrodes on its surface, a ceramic body provided with a heating means for said solid electrolyte body, and a carbon monoxide oxidation catalyst layer on one side of said electrode. A carbon monoxide sensor that is configured and installed separately from the combustion device, a combustion determination unit that determines the operation of the combustion device, a transmission unit that wirelessly transmits the output of the combustion determination unit, and a reception unit that receives the output, Heating power adjusting means for adjusting the heating power of the heating means for the solid electrolyte body according to the signal of the receiving means; amplifying means for amplifying the voltage between the electrodes of the carbon monoxide sensor; A carbon monoxide detection device comprising: a voltage comparison unit that compares the value with a value; and a stop instruction unit that instructs a stop of combustion of a plurality of combustion devices based on an output of the voltage comparison unit. 6. A carbon monoxide detector according to claim 5, wherein at least the combustion determining means for determining the operation of the combustion equipment and a power source for driving other than the transmitting means for wirelessly transmitting the output of the combustion determining means comprise a battery. 7. The carbon monoxide detection according to claim 1, wherein the heating power adjusting means has heating voltage measuring means, heating current measuring means, and power calculating means for calculating power from the measured values of both means. apparatus. 8. The carbon monoxide detector according to claim 1, further comprising a resistance calculating means for calculating a resistance value of the heating means of the solid electrolyte body from the heating voltage measuring means and the heating current measuring means. 9. The heating means for heating the solid electrolyte body at a temperature of 350 ° C. to 400 ° C. during low power operation of the heating power adjusting means and at 450 ° C. to 500 ° C. at high power operation.
5. The carbon monoxide detector according to 5.