JP2000346825A - Carbon monoxide detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an imperfect combustion of a plurality of combustion machineries with a single carbon monoxide detecting device. SOLUTION: The voltage between the electrodes 12, 13 of carbon monoxide sensor element part 17 reflecting the information on carbon monoxide concentration is amplified by an amplifier 18. The output of the amplifier 18 is compared with a prescribed voltage value determined by a voltage comparison means 20 in a voltage comparator 19, and, if it is greater, the command of combustion stop is given to a plurality of combustion meachineries by a combustion stop command means 21. Thereby, the danger of carbon monoxide poisoning can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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. 7, a combustion state is detected by a carbon monoxide sensor 3 or an oxygen sensor 4 installed in an exhaust stack 2 of a gas water heater 1, information is loaded on an information bus 5, and other gas equipment (here, gas Information from the table 6) is also put on the information bus 5. Information on the information bus 5 is the microcomputer meter 7
Then, the information was compared with the flow rate information of each gas appliance, and the gas appliance which caused incomplete combustion was identified, and the gas to the gas appliance was shut off or an alarm was issued.

[0004]

However, in the conventional incomplete combustion detection control shown in FIG. 7, 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. However, there is a problem that the number of sensors becomes large and the cost increases.

[0005] Further, since gas combustion equipment is centrally managed by a microcomputer meter, it is possible to cut off gas supply when incomplete combustion is detected. It could not cope with combustion.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a solid electrolyte having oxygen ion conductivity and a surface provided with a pair of electrodes and a ceramic provided with heating means for the solid electrolyte. A carbon monoxide sensor element configured by providing a carbon monoxide oxidation catalyst layer on one side of the body and the electrode, an amplifying means for amplifying a voltage between the electrodes of the carbon monoxide sensor element, and an output value of the amplifying means. It has voltage comparing means for comparing 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.

According to this method, the concentration of carbon monoxide is detected by a single carbon monoxide detector installed in a space (living room, kitchen, etc.) which is affected by the exhaust gas of a plurality of combustion equipment, and the concentration of the carbon monoxide is determined to be a certain value or more. When the concentration of carbon oxide is detected, the combustion of a plurality of combustion devices can be stopped, and the combustion devices can be controlled safely.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention of claim 1 is directed 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 an upper surface of one side of the electrode. A carbon monoxide sensor element configured by providing a carbon monoxide oxidation catalyst layer, an amplifying means for amplifying a voltage between electrodes of the carbon monoxide sensor element, and a voltage for comparing an output value of the amplifying means with a constant voltage value. It has a comparison unit and a combustion stop instruction unit for a plurality of combustion appliances based on the output of the voltage comparison unit, so that a plurality of combustion appliances can be controlled by one carbon monoxide detection device.

According to a second aspect of the present invention, the solid electrolyte body is constituted by a solid electrolyte layer having a thickness of 3 to 10 micrometers by high frequency sputtering, and the impedance is reduced by making the oxygen ion conductive portion thin. can do. Further, the heating efficiency of the heating means for exhibiting oxygen ion conductivity can be increased, and the ability to detect carbon monoxide can be increased.

According to a third aspect of the present invention, the heating means for the solid electrolyte body is constituted by means for intermittently supplying current.
Energy required for the heating means can be reduced, and the life of the detection device can be extended.

According to a fourth aspect of the present invention, there is provided a transmitter for instructing combustion stop provided in a means for instructing combustion stop of a plurality of combustion devices, a receiver provided in the plurality of combustion devices, and a power supply stopping means. Therefore, the degree of freedom of the installation location of the detection device and the installation location of the combustion equipment can be increased.

According to a fifth aspect of the present invention, there is provided a power source for heating means and other components, wherein the power source is constituted by a battery, and the detecting device is installed in a place where there is no AC power source. This makes it possible to increase the degree of freedom of the installation location.

According to a sixth aspect of the present invention, there is provided 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 mono-oxide on one side of the electrode. A carbon monoxide sensor element provided with a carbon oxidation catalyst layer, an amplifying means for amplifying a voltage between electrodes of the carbon monoxide sensor element, and a voltage comparing means for comparing an output value of the amplifying means with a constant voltage value And a transmitter for transmitting an alarm to a gas safety device having a communication function by the output of the voltage comparison means, and not only gas combustion equipment,
Other combustion equipment can be centrally monitored externally using the external communication function of the microcomputer meter.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

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

In FIG. 1, reference numeral 11 denotes 400 ° C. to 500 ° C.
A solid electrolyte body having oxygen ion conductivity at high temperatures 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), which has gas permeability and covers the electrode 12.

Reference numeral 15 denotes a heater of a heating means formed on the surface of the ceramic plate 16 by vapor deposition or printing.
Is heated to operate as a carbon monoxide sensor. Solid electrolyte body 11, ceramic plate 16 and ceramic paper 1
4 constitutes a carbon monoxide sensor element section 17.

The outputs of the electrodes 12 and 13 are input to an amplifier 18 serving as amplifying means. The output of the amplifier 18 is connected to one of the input terminals of a voltage comparator 19, and the other input terminal of the voltage comparator 19 is connected to a detection terminal. The output of the voltage comparing means 20 for setting a voltage value corresponding to the concentration of carbon monoxide to be connected is connected. The output of the voltage comparator 19 is connected to the combustion stop instructing means 21, and the output of the combustion stop instructing means 21 is connected to a plurality of (three in the figure) predetermined combustion devices 22, 23, and 24.

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 body 11, the oxygen atom adsorbed on the electrode 12 is ionized by the reaction represented by the formula (1).

[0021] 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 body 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 body 11 and the ceramic paper 14 to a constant temperature so that the reactions of the formulas (1) and (2) occur stably.

As the concentration of carbon monoxide increases, the amplifier 18
Rises and the voltage value becomes larger than the output of the comparison voltage setting means 20, the output of the voltage comparator 19 becomes HIGH, and gives an instruction to the combustion stop instruction means 21 to issue a combustion stop signal of the device. . A combustion stop instruction is sent from the combustion stop instruction means 21 to the combustion devices 22, 23, 24, and the relay contacts 25, 26, 27 of the individual devices are opened. With such a configuration, when one carbon monoxide detector detects an abnormal carbon monoxide concentration, a plurality of combustion devices 22, 23, and 24 that may have caused incomplete combustion are stopped at the same time. Carbon oxide poisoning can be prevented beforehand.

The carbon paper monoxide oxidizing catalyst may be held in place of the ceramic paper 14 and may be made of a gas permeable material. For example, even if a fibrous metal is used, the effect is not changed. The same applies to the following embodiments.

(Embodiment 2) FIG. 2 is a configuration diagram of a carbon monoxide sensor element section in Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the detailed description is omitted.

Electrodes 12 and 13 are formed by printing or sputtering on a porous ceramic plate 28 having a thickness of about 0.5 mm through which gas passes, and 8 mol of yttria, which is an oxygen ion conductor, is covered so as to cover the electrodes 12 and 13. % Yttria-stabilized zirconia and solid electrolyte layer 2
9 is formed to have a thickness of 3 to 10 micrometers. The heater 15 is formed on the surface of the solid electrolyte layer 29 via an insulating layer 30 such as alumina. At a position facing the electrode 12 with the porous ceramic plate 28 interposed therebetween, ceramic paper 14 impregnated with an oxidation catalyst of carbon monoxide is provided.

With this configuration, the solid electrolyte layer 29 is formed to be very thin, the impedance is reduced, and the oxygen ion conduction efficiency is improved as compared with the case where the solid electrolyte body 11 is used. Therefore, the ability to detect carbon monoxide is also improved. Further, since the thickness is reduced, the heat of the heater 15 is efficiently transmitted, and the electric power required for heating can be reduced.

(Embodiment 3) FIG. 3 is a block diagram of a control circuit of a carbon monoxide detector according to Embodiment 3 of the present invention.
The same parts as those in the first embodiment are denoted by the same reference numerals, and the detailed description is omitted.

The heater 15 is connected to a power supply 31 and a contact 33 of a timer 32 in series with the power supply 31. The timer 32 is configured to close the contact 33 intermittently. For example, the voltage from the voltage source 31 is applied to the heater 15 only for one minute in a cycle of ten minutes. By intermittently energizing the heater 15 in this manner, the actual energizing time can be shortened as compared with the case where the heater 15 is constantly energized, so that the life of the carbon monoxide detecting device can be extended, and the continuous operation can be performed almost all day in a severe winter. It is possible to secure a sufficient life of the carbon monoxide detector as a combustion monitoring device for an indoor combustion heating device such as an oil fan heater used.

(Embodiment 4) FIG. 4 is a configuration diagram of a control circuit of a carbon monoxide detector according to Embodiment 4 of the present invention.
The same parts as those in the first embodiment are denoted by the same reference numerals, and the detailed description is omitted.

The combustion stop instructing means 21 is provided with a transmitter 34, and the combustion appliances 22, 23, 24 are provided with receivers 35, 3.
6, 37 are installed. When the instruction to stop the combustion is transmitted from the transmitter 34, it is received by the receivers 35, 36, and 37, and the relay contacts 25, 26, and 27, which are the means for stopping the power supply to the individual combustion devices 22, 23, and 24, are opened. .

Since the transmitter 34 and the receivers 35, 36, 37 are installed independently, the combustion devices 22, 23, 2
The degree of freedom is increased in the arrangement of 4 and the arrangement of the carbon monoxide detector. The same effect can be obtained as long as it is used for transmission other than radio waves, infrared transmission using LEDs, ultrasonic waves, and other wired transmission.

(Embodiment 5) FIG. 5 is a configuration diagram of a control circuit of a carbon monoxide detector according to Embodiment 5 of the present invention.
The same parts as those in the first embodiment are denoted by the same reference numerals, and the detailed description is omitted.

A battery 38 is used for sensors such as the amplifier 8, the voltage comparator 19, and the heater 15 and for a power supply of a control circuit. The use of the battery 38 eliminates the restriction on the location of the power supply, and increases the degree of freedom in installing the carbon monoxide detector. By transmitting information to and from the combustion devices 22, 23, and 24 by wireless transmission, the arrangement of the devices can be freely performed.

(Embodiment 6) FIG. 6 is a configuration diagram of a control circuit of a carbon monoxide detector according to Embodiment 6 of the present invention.
The same parts as those in the first embodiment are denoted by the same reference numerals, and the detailed description is omitted.

The microcomputer meter 39, which is a gas safety device, can notify the external monitoring station via a modem 40 via a telephone line or the like. By transmitting the output of the voltage comparing means 20 to the receiver 42 of the microcomputer meter 39 by the transmitter 41, not only the gas combustion equipment but also the combustion abnormality of the combustion equipment other than the gas which may generate carbon monoxide. Can also be reported to an external monitoring station, which can contribute to further improving the safety of the combustion equipment.

[0038]

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

With a single carbon monoxide sensor installed in the monitoring area, a plurality of combustion devices that may have abnormal combustion can be stopped at the same time, thereby preventing carbon monoxide poisoning.

By employing a solid electrolyte layer composed of a thin film, a low power carbon monoxide sensor can be manufactured.

By intermittently operating the heater for heating the solid electrolyte body, the life of the carbon monoxide detector can be extended, and a low power, long life carbon monoxide detector can be realized.

Since the transmitter and the receiver are installed independently and the information is transmitted wirelessly, the arrangement of the equipment and the carbon monoxide detector can be freely arranged.

By using a battery as a power source for a heater (heating means) and other components, it is possible to detect an optimum location for detecting carbon monoxide even in a place where an outlet is not installed, such as a ceiling or an upper wall. Equipment can be installed.

By transmitting the information obtained by the detection device to the microcomputer meter and transmitting the information to an external monitoring station using the function of the microcomputer meter, incomplete combustion of the combustion equipment other than gas can be externally monitored.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram of a carbon monoxide sensor element unit according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a control circuit of the carbon monoxide detector according to Embodiment 3 of the present invention.

FIG. 4 is a configuration diagram of a control circuit of a carbon monoxide detector according to Embodiment 4 of the present invention.

FIG. 5 is a configuration diagram of a control circuit of a carbon monoxide detector according to Embodiment 5 of the present invention.

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

FIG. 7 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 body 12, 13 Electrode 14 Ceramic paper (carbon monoxide oxidation catalyst layer) 15 Heater (heating means) 16 Ceramic plate 17 Carbon monoxide detector element part 18 Amplifier (amplification means) 19 Voltage comparator 20 Voltage comparison means DESCRIPTION OF SYMBOLS 21 Combustion stop instruction means 22, 23, 24 Combustion equipment 25, 26, 27 Relay contact (power supply stop means) 28 Porous ceramic plate 29 Solid electrolyte layer 30 Insulating layer 31 Power supply 32 Timer 33 Contact 34, 41 Transmitter 35, 36 , 37, 42 Receiver 38 Battery 39 Microcomputer meter (gas safety device) 40 Modem

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kunihiro Tsuruta 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. Terms (reference) 2G004 BB04 BJ03 BL20 BM01 BM04 BM07

Claims (6)

[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 element configured to include: amplifying means for amplifying a voltage between the electrodes of the carbon monoxide sensor element; voltage comparing means for comparing an output value of the amplifying means with a constant voltage value; A carbon monoxide detection device, comprising: means for instructing combustion stop of a plurality of combustion devices by an output of a voltage comparison means. 2. The method according to claim 1, wherein said solid electrolyte body has a thickness of 3 to 3 mm.
2. A solid electrolyte layer having a thickness of 10 micrometers.
The carbon monoxide detector according to any one of the preceding claims. 3. The carbon monoxide detection device according to claim 1, wherein said heating means for said solid electrolyte body is constituted by means for intermittently energizing. 4. The apparatus according to claim 1, further comprising: a transmitter for instructing combustion stop provided in the means for instructing combustion stop of the plurality of combustion devices, a receiver provided in the plurality of combustion devices, and power supply stopping means. Carbon detector. 5. An apparatus for detecting carbon monoxide according to claim 1, further comprising a power supply for heating means and other components, said power supply comprising a battery. 6. 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 element configured to include: amplifying means for amplifying a voltage between the electrodes of the carbon monoxide sensor element; voltage comparing means for comparing an output value of the amplifying means with a constant voltage value; A transmitter for transmitting an alarm to a gas safety device having a communication function by an output of the voltage comparing means.