JP3843546B2 - Safety equipment for gas burning appliances - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas safety device that improves the safety of gas combustion equipment.
[0002]
[Prior art]
Conventional safety devices for gas burning appliances, such as microcomputer-type gas meters, are systems that stop gas supply to prevent gas leaks due to misfires and emergency gas accidents such as when an earthquake occurs. It was a system that installed carbon monoxide sensors in gas appliances to detect the generation of carbon monoxide during abnormal combustion and stopped the combustion of individual gas appliances.
[0003]
[Problems to be solved by the invention]
However, the conventional safety system for gas combustion appliances using a microcomputer-type gas meter detects the outflow of raw gas such as misfire of the appliance and immediately shuts off the gas supply. Although effective in preventing explosion accidents, there has been a problem that it is impossible to detect the combustion state of individual instruments.
[0004]
In addition, in a system in which a carbon monoxide sensor is installed in each gas combustion device, it is possible to stop individual devices when the device is abnormal, but in the state where there are many gas combustion devices, calibration of the sensor and identification of abnormal devices are possible. There was also a problem that it was difficult to perform.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a plurality of gas combustion appliances, a gas flow rate measuring means for measuring a gas flow rate of the gas combustion appliances, and a plurality of gas combustion appliances. A carbon monoxide sensor for detecting the carbon monoxide concentration in the combustion exhaust gas for each appliance, an oxygen sensor for detecting the oxygen concentration, and whether the gas combustion appliance is burning from the flow rate measured by the gas flow rate measuring means. determined, a gas combustion appliances determination means for identifying the gas combustion appliances in combustion when the gas combustion appliances is determined to be during combustion, and calibration means for calibrating the reference value of the carbon monoxide and oxygen sensors comprising a said gas combustion appliances determination means detects incomplete combustion of the carbon monoxide sensor and the gas combustion appliances identified by receiving a detection signal from the oxygen sensor The gas flow path is shut off, and the calibration means calibrates the reference values of the carbon monoxide sensor and the oxygen sensor corresponding to the gas combustion equipment not specified by the gas combustion equipment determination means. it is intended to ensure the safety of the gas combustion in a state where a plurality of gas combustion appliances exist.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a plurality of gas combustion appliances, a plurality of gas combustion appliances, a gas flow rate measuring means for measuring a flow rate of gas used in the gas combustion appliances, and the gas combustion appliances. A carbon monoxide sensor that detects the carbon monoxide concentration in each combustion exhaust gas, an oxygen sensor that detects the oxygen concentration, and the flow rate measured by the gas flow rate measuring means determines whether the gas combustion appliance is burning. and, a gas combustion appliances determination means and said gas combustion appliances is to identify the gas combustion appliances in the combustion when it is determined that the combustion, and a calibration means for calibrating the reference value of the carbon monoxide and oxygen sensors And the gas combustion appliance determination means detects incomplete combustion of the gas combustion appliance specified by receiving detection signals from the carbon monoxide sensor and the oxygen sensor and detects gas. The flow path is blocked, and the calibration means calibrates the reference values of the carbon monoxide sensor and the oxygen sensor corresponding to the gas combustion instrument not specified by the gas combustion instrument determination means, The safety of gas combustion was ensured in the presence of many gas burning appliances.
[0007]
It is also conceivable to issue an alarm from the sensor detection information of at least one of the carbon monoxide sensor and the oxygen sensor.
[0008]
【Example】
Before describing embodiments of the present invention, reference embodiments thereof will be described below.
[0009]
(Reference Example)
In FIG. 1, reference numeral 1 denotes a microcomputer meter that measures a gas flow rate and determines a use situation such as combustion and non-combustion of a plurality of gas combustors from a flow rate and a gas consumption pattern. The exhaust pipe 3 of the gas water heater 2 is provided with an oxygen sensor 4 for detecting the oxygen concentration in the exhaust gas and a carbon monoxide sensor 5 for detecting the carbon monoxide concentration in the exhaust gas. The information is managed by the microcomputer meter 1. A gas table 7 is provided with an oxygen sensor 4 and a carbon monoxide sensor 5 similarly to the gas water heater 2, and a detected signal is sent to an information bus 6, and information is managed by the microcomputer meter 1.
[0010]
With the above configuration, combustion information of a plurality of gas combustion appliances can be grasped by a microcomputer meter, and not only gas leakage detection but also incomplete combustion can be detected to prevent a gas poisoning accident.
[0011]
Based on the above reference embodiment, an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected about the structure which performs the same effect | action as a reference example, and the thing of a reference example is used for description.
[0012]
(Example 1)
In FIG. 2, 8 is an oxygen sensor calibration means, 9 is a carbon monoxide sensor calibration means, and the oxygen sensor calibration means 9 has a steady-state output of an oxygen sensor 4 installed in a plurality of gas appliances. Value and the zero point output value of the carbon monoxide sensor 5 are recorded and connected to the information bus 6 and the data buses 10 and 11.
[0013]
In the above configuration, the microcomputer meter 1 identifies a non-combustion gas device from the gas flow rate and gas consumption pattern, grasps the outputs of the oxygen sensor 4 and the carbon monoxide sensor 5 installed in the gas device, and data The output value of the oxygen sensor 4 through the bus 10 is updated with the memory value inside the oxygen sensor calibration means 8. At the same time, the output value of the carbon monoxide sensor 5 is updated through the data bus 11 and the memory value in the carbon monoxide sensor calibration means 9 is updated.
[0014]
The reference value of the sensor can be acquired when the gas combustion device is not operating by the above operation, and the measurement accuracy is ensured. Further, the calibration of the sensor can be further improved by performing the calibration periodically such as one week or one month.
[0015]
(Example 2)
In the configuration of FIG. 2, the microcomputer meter 1 identifies the gas device being burned from the gas flow rate and the gas consumption pattern, grasps the output of the oxygen sensor 4 installed in the gas device, and the oxygen sensor through the data bus 10. 4 to update the reference value inside the oxygen sensor calibration means 8.
[0016]
With the above operation, the reference value of the oxygen sensor 4 can be acquired when the gas combustion device is operating, and the measurement accuracy is ensured. Further, the calibration of the sensor can be further improved by performing the calibration periodically such as one week or one month. In the third and fourth embodiments, it is needless to say that the calibration value is not updated when it is determined that the numerical value to be calibrated is larger than the numerical value expected in advance (time drift). Naturally, it is treated as a sensor abnormality.
[0017]
FIG. 3 shows a flowchart of the calibration procedure of the first and second embodiments .
[0018]
When the microcomputer meter 1 determines that the gas device is combusting, the output level of the oxygen sensor 4 installed in the gas device is acquired. If the level is within a normal range, the value is used to calculate the oxygen sensor calibration means 8 inside. Update the reference value. If the level is abnormal, an abnormality of the oxygen sensor 4 is displayed, or a measure corresponding to the abnormality of the oxygen sensor 4 such as a function stop is performed.
[0019]
On the other hand, when the microcomputer meter 1 determines that the gas device is not combusting, the output level of the oxygen sensor 4 is first acquired. If the level is within a normal range, the reference value in the oxygen sensor calibration means 8 is used as the value. Is updated, and the output level of the carbon monoxide sensor 5 is acquired. If the output level of the oxygen sensor 4 is abnormal, a measure corresponding to the abnormality of the oxygen sensor 4 such as displaying an abnormality of the oxygen sensor 4 or stopping the function is taken, and the output level of the carbon monoxide sensor 5 is acquired. The output level of the carbon monoxide sensor 5 is acquired, and if the level is normal, the reference value inside the carbon monoxide sensor calibration means 9 is updated with the value. If the level is abnormal, an abnormality of the carbon monoxide sensor 5 is displayed, or a measure corresponding to the abnormality of the carbon monoxide sensor 5 such as a function stop is performed.
[0020]
The calibration flow described above is appropriately performed for each gas combustion device to correct the change with time of the sensor. This calibration operation ensures the accuracy of the sensor display value.
[0021]
(Example 3)
In FIG. 4, when the oxygen sensor 4 and the carbon monoxide sensor 5 detect an abnormality, a warning is issued . Reference numeral 20 denotes a speaker which receives a signal from the microcomputer meter 1 and notifies the danger by sound. Reference numeral 21 denotes a display which displays the instrument number where an abnormality has occurred.
[0022]
In the above calibration, alarms and indications do not necessarily have to be in the vicinity of the microcomputer meter 1, and are installed in a monitoring center of a gas company or the like through a telephone line, etc. It becomes possible to prevent it.
[0023]
Example 4
In FIG. 5, the gas flow path 22 of the gas combustion appliance is blocked by electromagnetic valves 23 and 24 based on outputs from the oxygen sensor 4 and the carbon monoxide sensor 5 .
[0024]
With the above configuration, it is possible to stop only the gas device in which an abnormality has occurred, and thus it is possible to prevent a wide-area spread such as stopping the entire surrounding gas for failure repair at one place.
[0025]
(Example 5)
In FIG. 6 , in addition to stopping the gas supply to the device in which an abnormality has occurred, a means for notifying the abnormal device is provided.
[0026]
When an abnormality is detected by the oxygen sensor 4 and the carbon monoxide sensor 5, the gas supply to the equipment is stopped by the electromagnetic valves 23 and 24 attached to the equipment, and the abnormal equipment is notified by the speaker 20 and the display 21. Is done.
[0027]
Accordingly, safety is ensured by stopping the gas supply of the abnormal device, and the abnormal device can be easily identified, so that there is an advantage that the recovery operation can be performed quickly.
[0028]
The technical significance of the above embodiment will be summarized as follows.
[0029]
Combustion information of multiple gas combustion appliances can be grasped by oxygen and carbon monoxide sensors and microcomputer meters installed in the appliances, and not only gas leakage detection but also incomplete combustion can be detected to prevent gas poisoning accidents in advance. Can do.
[0030]
In addition, since the microcomputer meter detects when the equipment is combusting and when it is not combusting and can calibrate the sensor attached to each gas combustion appliance, the reliability of detection accuracy can be improved.
[0031]
In addition, since it is possible to report and display anomalies via the information bus, recovery can be performed quickly.
[0032]
Further, since the gas supply to the abnormal instrument can be shut off, the instrument can be restored quickly and safely with minimal influence on the surroundings.
[0033]
【The invention's effect】
The safety device for a gas combustion appliance of the present invention can grasp the combustion information of a plurality of gas combustion appliances by means of oxygen and carbon monoxide sensors and microcomputer meters installed in the appliance, and not only detects gas leakage but also incomplete combustion. It can detect and prevent gas poisoning accidents.
[Brief description of the drawings]
[1] Embodiment 2 of the present configuration diagram of a safety device for a gas burner in the first embodiment of the block diagram of a safety device for a gas burner [2] The present invention in reference example of the invention [3] The present invention FIG. 4 is a block diagram of a safety device for a gas combustion appliance in Embodiment 3 of the present invention. FIG. 5 is a configuration diagram of a safety device for a gas combustion appliance in Embodiment 4 of the present invention. FIG. 6 is a configuration diagram of a safety device for a gas combustion appliance according to a fifth embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Microcomputer meter 2 Water heater 4 Oxygen sensor 5 Carbon monoxide sensor 6 Information bus 7 Gas table 8 Oxygen sensor calibration means 9 Carbon monoxide sensor calibration means 20 Speaker 21 Display 23, 24 Solenoid valve

Claims (2)

A plurality of gas combustion appliances, a gas flow rate measuring means for measuring a gas flow rate of the gas combustion appliances, and a plurality of gas combustion appliances, each of which is provided with a carbon monoxide concentration in the combustion exhaust gas for each gas combustion appliance. A carbon monoxide sensor to detect and an oxygen sensor to detect the oxygen concentration and whether or not the gas combustion instrument is in combustion are determined from the flow rate measured by the gas flow rate measuring means , and the gas combustion instrument is in combustion Gas combustion appliance determination means for specifying the gas combustion appliance being burned when determined, and calibration means for calibrating the reference values of the carbon monoxide sensor and the oxygen sensor , the gas combustion appliance determination means, Detecting incomplete combustion of the gas combustion appliance specified by receiving detection signals from the carbon monoxide sensor and the oxygen sensor and shutting off the gas flow path; Calibration means safety device gas burner so as to calibrate the reference value of carbon monoxide and oxygen sensors corresponding to a gas combustion appliance identification by the gas combustion appliances determination means is not performed. The safety device for a gas combustion appliance according to claim 1, further comprising alarm means for issuing an alarm from information detected by at least one of the carbon monoxide sensor and the oxygen sensor .

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