JPH08178281A - Co gas safety system - Google Patents

Abstract

PURPOSE: To provide a CO gas safety system in which riskiness to a human body of an indoor environment is more accurately grasped and more suitable safety management can be conducted. CONSTITUTION: A CO gas safety system 1 comprises a CO sensor 11 for detecting the indoor CO concentration, a gas apparatus 5 having operation mode switching means 15, and a communicating means 13 for communicating the sensor 11 with the apparatus 5. The contaminated state of the indoor air is directly monitored by the sensor 11, and the operating mode of the apparatus 5 is selected in response to the state to a normal operation mode, a combustion improving mode, a temporary stop mode, a complete stop mode, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety system against pollution of indoor environment due to incomplete combustion exhaust gas of combustion equipment. In particular, it is possible to more accurately understand the degree of danger to the human body in the indoor environment and perform more appropriate safety management.
O gas safety system.

[0002]

2. Description of the Related Art When a combustion device such as a water heater is used, incomplete combustion of the combustion device occurs, and the exhaust gas flows into the living room, the CO (carbon monoxide) concentration in the room increases, and May adversely affect people in the area. In order to prevent such a situation, a combustion device installed indoors is provided with a CO gas safety system.

FIG. 6 is a diagram schematically showing the configuration of a water heater having a conventional CO gas safety system according to an example. The water heater 5 is a machine that burns city gas in the burner 63 and heats the water in the heat exchanger 61 into hot water.

City gas is supplied to the burner 63 from the gas pipe 69. The combustion air is supplied from the fan 65 to the burner 63.
Sent to. The combustion exhaust gas is exhausted to the outside from the exhaust passage 51 on the heat exchanger 61.

The conventional CO gas safety system of the water heater of FIG. 6 will be described. A CO sensor 53 is attached to the wall surface of the exhaust passage 51 to detect the CO concentration in the exhaust. The signal from the CO sensor 53 is sent to the water heater controller 59 via the calculation unit 57. The CO sensor 53 and the calculation unit 57 form a CO detection unit 55.

On the other hand, a gas cutoff valve 67 is provided in the gas pipe 69, and when necessary, the gas cutoff valve 67 is cut off by a command from the controller 59, and the combustion of the burner 63 is immediately stopped. ing. The controller 59 also controls the rotation speed of the fan 65.

The CO detection unit 55 constantly detects the CO concentration during operation of the water heater. And the controller 5
The device control microcomputer in 9 reads the CO concentration and determines the level of incomplete combustion of the combustion device.

If the detected value exceeds the value equivalent to 1000 ppm, the rotation speed of the air supply fan 65 is first increased. Such an operation mode is called a combustion improvement mode. Then, the combustion improvement mode is continued for a fixed time (13 minutes in one example). If the incomplete combustion is still not resolved, the gas shutoff valve 67 is shut off to stop the combustion and an error code is displayed on the operation section of the device.

[0009]

However, the above-mentioned conventional safety system against CO gas has the following problems. The state of indoor pollution due to combustion exhaust gas is C in the combustion exhaust gas.
It depends not only on the O concentration data, but also on the air volume in the room, the ventilation status, and the displacement of the water heater. Since the sensor is used under severe conditions such as exhaust, it requires material restrictions and special temperature compensation.
The cost of the O detection unit is high.

It is an object of the present invention to provide a CO gas safety system capable of more accurately grasping the degree of danger to the human body in the indoor environment and performing more appropriate safety management.

[0011]

In order to solve the above-mentioned problems, the CO gas safety system of the present invention has a possibility of polluting the indoor environment with a CO sensor for detecting the indoor CO concentration provided in the room. And a communication means for connecting the CO sensor to the combustion device; the combustion device performs combustion control based on the indoor CO concentration signal transmitted from the CO sensor, and the safety of the indoor environment. It is characterized by managing.

[0012]

In the present invention, the CO sensor is placed indoors to directly detect the indoor CO concentration. In other words, the state of indoor air pollution is directly monitored. And combustion control is performed according to the situation. For example, a combustion device operation mode such as a normal operation mode, a combustion improvement mode, a temporary stop mode, or a complete stop mode is selected. Therefore, it is possible to more accurately grasp the degree of danger to the human body in the indoor environment and perform more appropriate safety management.
Can provide gas safety system.

[0013]

Embodiments of the present invention will be described below. Figure 1
It is a figure showing the outline of the anti-CO gas safety system concerning one example of the present invention. A gas water heater 5 is placed in the living room 3, and a CO sensor 11 for detecting the indoor CO concentration is attached to the ceiling of the living room 3. The CO sensor 11 and the controller 15 of the water heater 5 are connected by a signal line which is a communication means.

Here, if incomplete combustion occurs in the water heater 5 and the exhaust pipe 7 of the water heater 5 is disconnected and the exhaust gas flows into the living room 3, the indoor CO concentration will increase. .
The CO sensor 11 detects this increase in the indoor CO concentration, and the controller 15 controls the combustion of the water heater.

FIG. 2 is a block diagram showing the configuration of the control system of the CO gas safety system shown in FIG. The signal from the CO sensor 11 is input to the A / D converter 21. Then, the A / D converted signal is input to the calculation unit 23. The calculation unit 23 calculates a CO concentration value (or a corresponding numerical value) and outputs the same value via the signal line 13 to the controller 15
It is sent to the comparison unit 25 inside.

The comparison unit 25 has an attached storage unit 27.
The various threshold values stored therein are compared with the current detected value, and the result is sent to the combustion control unit 29. Combustion control unit 2
9 is an air supply fan 31 in the water heater 5 and a gas cutoff valve 33.
Control.

Next, the operation of this CO gas safety system will be described. FIG. 3 shows a pair C according to the embodiment of FIGS.
It is a flow chart which shows control operation of an O gas safety system. After the start, first read the CO concentration in the living room (S
1). Then, the indoor CO concentration is compared with the first threshold value (S2). The first threshold is, for example, 1000 pp
Set to about m. When the indoor CO concentration is less than the first threshold value (S2, YES), the operation condition is not changed and the operation is performed in the normal operation mode (S3).

If the indoor CO concentration is not less than the first threshold value (S
If NO, proceed to S4 and compare the indoor CO concentration with the second threshold value (S4). The second threshold value is set to about 1500 ppm, for example. When the indoor CO concentration is less than the second threshold value (S4, YES), the operation is performed in the combustion improvement mode (S5). In the combustion improvement mode, the number of revolutions of the air supply fan is increased to increase the amount of combustion air sent to the burner, and CO emission is reduced.

The indoor CO concentration is not less than the second threshold value (S4,
In the case of NO), the process proceeds to S6, and the indoor CO concentration is compared with the third threshold value (S6). The third threshold value is set to about 2000 ppm, for example. When the indoor CO concentration is less than the third threshold value (S6, YES), the operation is performed in the temporary stop mode (S7). In the temporary stop mode, the combustion of the burner is stopped by operating the gas cutoff valve of the water heater. Then, after waiting for the decrease in the indoor CO concentration, a standby state in which operation can be started is entered.

The indoor CO concentration is not less than the third threshold value (S6,
In the case of NO), the complete stop mode (S8) is immediately set.
It is not possible to release the complete stop mode without calling the maintainer of the combustion equipment store, and the maintainer can check the combustion equipment and the exhaust pipe for abnormalities and take action to deal with them before releasing the complete stop mode. it can.

FIG. 4 shows another embodiment of the present invention with respect to CO.
It is a figure which shows schematic structure of a gas safety system. The CO gas safety system of this embodiment includes a CO sensor 11 provided in the room 3 for detecting the indoor CO concentration and a gas pipe for supplying gas to a combustion device 41 that may pollute the environment of the room 3. A gas cutoff valve 43 provided on the
Communication means 1 for connecting the sensor 11 and the gas cutoff valve 43
3, and the gas cutoff valve 43 operates based on the indoor CO concentration signal transmitted from the CO sensor 11.

In the CO gas safety system of this embodiment, the combustion improving operation cannot be performed, but the combustion device (fan heater) 4 connected to the gas pipe 42 is used.
The safety system can be operated regardless of the type, year, or specifications of the 1 type. Therefore, it is possible to prevent a CO poisoning accident due to incomplete combustion of a combustion device that does not have a CO sensor or an operation mode switching unit.

FIG. 5 is a diagram showing another embodiment of the present invention with respect to CO.
It is a figure which shows schematic structure of a gas safety system. The CO gas safety system of this embodiment supplies gas to the CO sensor 11 provided in the room 3 for detecting the indoor CO concentration and the combustion devices 5 and 41 that may pollute the environment of the room 3. It comprises a gas meter 45 with a built-in gas cutoff valve provided in the gas pipe 47, and a communication means 13 for connecting the CO sensor 11 and the gas meter 45 with a built-in gas cutoff valve; the indoor CO concentration transmitted from the CO sensor 11 The gas meter 45 with a built-in gas cutoff valve operates based on a signal.

In the CO gas safety system of this embodiment, the combustion equipment in each chamber is stopped when an abnormality occurs. Therefore, for example, exhaust gas leaking due to disconnection of the exhaust pipe 7 in the ceiling, flows into another room, and the CO
When the concentration is deteriorated (when the room where the combustion equipment is installed and the room where the CO concentration rises in the room is different) or when multiple combustion equipment are used, all the combustion equipment in one household will stop. So it's safe.

It is also possible to construct a safety system against CO gas by appropriately combining the above-mentioned three embodiments.

[0026]

As described above, as described above, the present invention is effective against CO.
The gas safety system has the following effects. Since the state of indoor air pollution is monitored, it is possible to accurately understand the degree of danger to the human body in the indoor environment and to perform more appropriate safety management. Since the CO sensor is used at room temperature, there are few restrictions on the material and structure and no special temperature correction is required, so the cost can be reduced. Moreover, the durability and reliability of the sensor are improved.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a CO gas safety system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a control system of the CO gas safety system of FIG.

FIG. 3 is a flowchart showing a control operation of the CO gas safety system according to the embodiment of FIGS. 1 and 2.

FIG. 4 is a diagram showing a schematic configuration of a CO gas safety system according to another embodiment of the present invention.

FIG. 5 is a diagram showing a schematic configuration of a CO gas safety system according to another embodiment of the present invention.

FIG. 6 is a diagram schematically showing a configuration of a water heater having a conventional CO gas safety system according to an example.

[Explanation of symbols]

1 Safety System 3 Living Room 5 Gas Water Heater 7 Exhaust Pipe 11 CO Sensor 13 Signal Line 15 Control Device 21 A / D Converter 23 Calculation Unit 25 Comparison Unit 27 Storage Unit 29 Combustion Control Unit 31 Fan 33 Gas Cutoff Valve 41 Fan Heater 42 Gas piping 43 Gas cutoff valve 45 Gas meter 51 Exhaust passage 53 CO sensor 55 CO detection unit 57 Calculation unit 59 Water heater controller 61 Heat exchanger 63 Burner 65 Fan 67 Gas cutoff valve 69 Gas pipe

Claims (3)

[Claims] 1. A CO sensor provided in a room for detecting the indoor CO concentration, a combustion device that may pollute the environment in the room, and a communication means for connecting the CO sensor and the combustion device. A safety system for CO gas, wherein the combustion device controls combustion based on an indoor CO concentration signal transmitted from a CO sensor to manage safety of indoor environment. 2. A CO sensor provided in a room for detecting a CO concentration in the room, a gas cutoff valve provided in a gas pipe for supplying gas to a combustion device that may pollute the environment in the room, A communication means for connecting the sensor and the gas cutoff valve; the gas cutoff valve operates based on the indoor CO concentration signal transmitted from the CO sensor. system. 3. A CO sensor installed in the room for detecting the indoor CO concentration, and a gas meter with a built-in gas cutoff valve installed in a gas pipe for supplying gas to a combustion device that may pollute the environment in the room. And a communication means for connecting the CO sensor and the gas shut-off valve built-in gas meter; the gas shut-off valve built-in gas meter operates based on the indoor CO concentration signal transmitted from the CO sensor. A CO gas safety system characterized by the following.