JP2001153355A - Monitor for gas combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitor for gas combustor in which the reference exhaust gas temperature for determining start of driving a CO sensor can be altered depending on the aging and the type of a hot water supply apparatus being coupled. SOLUTION: The monitor for gas combustor comprises an exhaust gas temperature sensor 5 for a gas combustor 2, means 101-1 for comparing a temperature detected by the exhaust gas temperature sensor 5 with reference temperature information for determining a combustion state, means 103 for driving a CO sensor 4 detecting CO gas contained in the exhaust gas based on the comparison results, and a control means 101-2 for monitoring the gas combustor 2 based on a CO concentration detected by the CO sensor 4. The monitor for gas combustor further comprises means 102 for designating a value being employed as the reference temperature information among a plurality of pieces of different temperature information, and means 101-3 for setting the reference temperature information based on the designated value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon monoxide (hereinafter abbreviated as "CO") gas detecting device for a gas combustion device such as a water heater, and more particularly to a CO in an exhaust gas for monitoring and controlling the gas combustion device. The present invention relates to a monitoring device for a gas combustion device, which effectively controls the start or stop of driving of a CO sensor for detecting a concentration.

[0002]

2. Description of the Related Art Conventionally, this kind of monitoring apparatus for a gas combustion apparatus is disclosed in Japanese Patent No. 2903074 and Japanese Patent Laid-Open No. 6-29553.
No. 9, as shown in Japanese Patent Publication No.
Type) and a gas combustion device. This monitoring device detects the combustion state of the gas combustion device from the temperature of the exhaust gas from the gas combustion device, and when detected, uses a contact combustion type CO detection element to detect the concentration of combustible gas such as CO in the exhaust gas. Is measured. When the concentration exceeds the reference level, a predetermined safety device is operated to prevent the room from being filled with carbon monoxide and causing a poisoning accident.
In the conventional monitoring device for a gas combustion device described above, the temperature detected by the temperature sensor for detecting the exhaust gas temperature is compared with a fixed reference temperature set in advance, and when the detected temperature exceeds the reference temperature, the power is supplied to the CO sensor. First, it is heated to a predetermined temperature to perform cleaning, and operation power for CO gas detection is supplied.

[0003]

However, in the conventional monitoring apparatus for a gas combustion apparatus, the following problem occurs because the reference temperature for starting the driving of the CO sensor is fixedly set in advance. I do.

[0004] That is, the above-mentioned reference temperature should change depending on the type of the gas combustion device to be connected, the combustion state of the gas combustion device, the installation environment, and the aging, but conventionally, the reference temperature is set in advance in all situations. Since the set reference temperature is used in a fixed manner, there is a problem that, in some cases, extremely useless power consumption occurs or the life of the CO sensor is shortened due to useless operation. Also, CO
Even when it is desired to change the operation timing of the sensor according to the situation, the above-described conventional monitoring device for a gas combustion device cannot be changed because the reference temperature for determining the operation timing is fixedly set. Was.

Accordingly, the present invention has been made in view of the above-mentioned situation, has solved the above-mentioned problems, and can change the reference of the exhaust gas temperature for determining the start of CO driving according to the aging and type of the connected water heater. It is an object to provide a monitoring device for a gas combustion device.

[0006]

According to a first aspect of the present invention, there is provided a monitoring apparatus for a gas combustion apparatus, comprising: a gas combustion apparatus (2); An exhaust gas temperature sensor (5) for detecting the temperature of exhaust gas discharged from the exhaust gas, and a comparing means () for comparing the temperature detected by the exhaust gas temperature sensor (5) with reference temperature information for judging a combustion state. 101-1), a CO sensor driving means (103) for driving a CO sensor (4) for detecting a CO gas contained in the exhaust gas based on a comparison result of the comparing means (101-1), Control means (101-) for monitoring and controlling the gas combustion device (2) based on the CO concentration detected by the sensor (4);
2) the monitoring device for a gas combustion device, comprising: a designation unit (102) for selectively designating a value to be the reference temperature information from a plurality of pieces of temperature information having different values; Setting means (101-3) for setting the reference temperature information based on the specified value.

According to the first aspect of the present invention, the specifying means (102) selectively specifies a value as reference temperature information from a plurality of pieces of temperature information having different values. The setting means (101-3) sets the reference temperature information based on the designated value. Then, on the basis of the set reference temperature information, the CO concentration for detecting the CO concentration for monitoring and controlling the gas combustion device (2) is controlled.
The sensor (4) is driven. Therefore, it is possible to flexibly cope with a standard that fluctuates depending on the type of the gas combustion device to be connected, the combustion state of the gas combustion device, the installation environment, and the aging. As a result, it is possible to prevent wasteful power consumption due to the use of a fixed reference in all situations, and a reduction in the life of the CO sensor due to wasteful operation. Also, since the designation can be selectively made by the designation means (102), the reference can be set easily and reliably.

According to a second aspect of the present invention, there is provided a monitoring apparatus for a gas combustion apparatus, wherein the plurality of pieces of temperature information having different values include a plurality of specific temperatures predetermined according to a situation. Value.

According to the monitoring apparatus for a gas combustion apparatus of the present invention described in the second aspect, the specifying means (102) sets the optimum reference value according to the situation to a plurality of predetermined specific temperature values. Can be specified for selection from among. As a result, the reference can be easily and reliably selected according to the situation.
Further, by using a specific temperature value as a reference, it is possible to more easily and surely provide an effective reference temperature according to a situation.

According to a third aspect of the present invention, there is provided a monitoring apparatus for a gas combustion apparatus, wherein the plurality of pieces of temperature information having different values are provided for a plurality of predetermined times predetermined according to a situation. Characterized in that it is the amount of change in temperature.

According to the monitoring apparatus for a gas combustion apparatus of the present invention, the designating means (102) sets the optimum reference value depending on the situation in a plurality of predetermined times. It can be designated for selection from among the change amounts. As a result, the reference can be easily and reliably selected according to the situation. Further, by using the specific temperature change amount as the reference, it is possible to control the CO sensor drive more quickly and more effectively before reaching the specific reference temperature, based on the degree of the change.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of a monitoring device for a gas combustion device according to the present invention applied to a gas combustion device of a gas water heater.

In FIG. 2, a water heater monitoring device 1 (monitoring device for a gas combustion device) is connected to a water heater 2. The water heater 2 is an indoor installation type (FE type) using a driving power supply AC100V, and the water heater 2 is supplied via the water heater monitoring device 1.
, The necessary driving power is supplied. A CO sensor 4 for detecting the concentration of CO in the exhaust gas and a temperature sensor 5 for detecting the temperature of the exhaust gas are provided at predetermined positions of the exhaust port 3 through which the combustion gas passes. The detection outputs of the CO sensor 4 and the temperature sensor 5 are respectively supplied to the water heater monitoring device.

A fan 8 for supplying necessary air to the burner 7 is provided at a lower end portion of the water heater 2 main body, and the air from the fan 8 and the gas from the gas supply pipe 10 are supplied to the water heater 2 main body. The gas is sent to the burner 7 in the inside to burn the gas. In the heat exchanger 6 disposed above the burner 7, water sent from a water supply pipe (not shown) is heated to a predetermined temperature.
The combustion gas containing combustible gas such as CO from the burner 7 is exhausted to an exhaust port 3 provided at the upper end of the water heater 2.

The CO sensor 4 has a detection element section arranged so as to be able to contact exhaust gas, and this detection element section constitutes a bridge circuit with a comparison element for temperature compensation, a fixed resistor and a movable resistor. When the detection element touches the exhaust gas, it generates heat according to the CO concentration in the exhaust gas, and the resistance value changes, which breaks the equilibrium state of the bridge circuit and the size according to the degree of imbalance Is output as a CO concentration detection output.

In the above configuration, when the water heater 2 is ignited, the water heater monitoring device 1 determines that the water heater 2 is in use by a flow sensor (not shown), and ignites the burner 7 and sets the fan. Rotate 8. As a result, the air from the fan 8 and the gas from the gas supply pipe 10 are brought into a combustion state by the burner 7, and the water from the water absorption pipe is heated to a predetermined temperature in the heat exchanger 6. The water heater monitoring device 1 also obtains information obtained from the detected exhaust gas temperature from the temperature sensor 5 and a reference temperature value (corresponding to the first embodiment) designated by a dip switch (not shown) or a reference temperature change rate. (Corresponding to the second embodiment), and when it is determined that the water heater 2 is in a combustion state, the CO sensor 4 is operated to start detection of the CO concentration. CO
The detection output from the sensor 4 is compared with a predetermined reference concentration value. When the detected concentration exceeds the reference concentration, the water heater monitoring device 1 activates an alarm buzzer (not shown) and shuts off the electromagnetic valve 9 provided in the gas supply pipe. And burner 7 is digested. Further, the power supply to the water heater 2 is also stopped.

When the faucet is closed on the water heater side,
The flow sensor detects a change in the amount of water, and based on this, the water heater monitoring device 1 extinguishes the burner 7, stops the fan 8, and stops driving the CO sensor 4 and the temperature sensor 5.

FIG. 3 is a block diagram showing the configuration of the monitoring apparatus for a gas combustion apparatus according to the present invention connected to the water heater.

In FIG. 3, the water heater monitoring apparatus 1 has a control unit 101 for monitoring and controlling the water heater. Control unit 10
Reference numeral 1 denotes a memory 101a in which a control program and reference temperature information to be described later are stored, a central processing unit (CPU) that operates according to the program stored therein, and a read / write that stores data generated in the course of the processing operation of the CPU. It has a built-in memory (RAM). Control unit 1
01 further includes timer means for outputting time information. Incidentally, the timer means, the CPU and the RAM are not shown.

Reference numeral 102 denotes a dip switch, which will be described later.
The reference temperature or the reference temperature change rate is designated by a combination of these ON / OFF. The designated reference temperature is determined by the connected control unit 10.
1 is detected.

Reference numeral 103 denotes a driving circuit of the CO sensor 4;
A control unit 103 starts driving the CO sensor 4 in response to a control signal from the control unit 101, receives a CO concentration detection signal from the CO sensor 4, and outputs the signal to the control unit 101. The control unit 101 also has a function of converting a voltage value, which is a detection signal from the CO sensor 4, into a digital value.

Reference numeral 104 denotes a driving circuit for the temperature sensor 5,
In response to a control signal from the control unit 101, the control unit 101 starts driving the temperature sensor 5, receives an exhaust gas temperature detection signal from the temperature sensor 5, and outputs the signal to the control unit 101.

Reference numeral 105 denotes a drive circuit for the gas solenoid valve 9;
The gas solenoid valve 9 is opened and closed in response to a control signal from the control unit 101. Reference numeral 105 denotes a water heater power supply control circuit that outputs a power supply from the power supply circuit as a water heater power supply.

Reference numeral 106 denotes a water heater power supply control circuit, which stops the power supply to the water heater for safety under the control of the control unit 101 when an abnormality occurs.

Reference numeral 107 denotes a flow sensor connected to the water absorption pipe, which detects the amount of water and outputs to the control unit 101 a signal indicating that the water heater is in use.

Reference numeral 108 denotes a burner control circuit.
The burner is ignited or extinguished in response to a control signal from 01.

Reference numeral 109 denotes a fan drive circuit,
The fan is moved or stopped in response to a control signal from the control unit 01.

Reference numeral 110 denotes an alarm circuit, which is an alarm buzzer which issues an alarm when the control unit 101 detects an abnormal situation from a detection signal from the CO sensor 4. Here, an LED or the like that simultaneously displays an abnormal state may be provided.

Reference numeral 111 denotes a power supply circuit,
Water heater monitoring device 1 by converting 100V to stabilized DC voltage
Supply to each part in.

Here, the setting by the dip switch 102 will be described. In the first embodiment, the DIP switch 102 specifies the reference temperature stepwise and selectively by a combination of a plurality of switches. Here, the reference temperature is set as shown in Table 1 below by a combination of the dip switches SW1 and SW2.

[0032]

[Table 1] Reference temperature classification

In Table 1, for example, when the setting is 0, the transition from the combustion state to the standby state, that is, the stop command of the CO sensor is based on 40 degrees Celsius, and the transition from the standby state to the combustion state, that is, the CO sensor The drive start command is based on 45 degrees Celsius to prevent the drive circuit from being repeatedly turned on and off due to vertical fluctuations near these temperatures.

Similarly, in the setting 1, the transition from the combustion state to the standby state is based on 45 degrees Celsius, the transition from the standby state to the combustion state is based on 50 degrees Celsius, and in the setting 2, The transition from the combustion state to the standby state is based on 50 degrees Celsius, the transition from the standby state to the combustion state is based on 55 degrees Celsius, and when setting 3, the transition from the combustion state to the standby state is 55 degrees Celsius. The transition from the standby state to the combustion state is based on 60 degrees Celsius. These data are
It is calculated in advance according to the situation. Therefore,
Depending on the situation, the user or the administrator does not need to calculate the reference value from scratch, but only needs to select the optimum value from the above.

These data are stored in the memory 1 of the control unit 101.
This data is read out according to the setting contents of the dip switch 102 and is used as a reference for determining the start / stop of the CO sensor drive.

The memory 101a of the control unit 101 has a second
In this embodiment, reference temperature change rate data as shown in Table 2 is stored instead of data as shown in Table 1. As in the first embodiment, the DIP switch 1
In 02, the reference temperature change rate or the change amount can be specified stepwise and selectively by a combination of a plurality of switches. Here, DIP switch SW1 and DIP switch SW2
, The reference temperature change rate is set as shown in Table 2 below.

[0037]

[Table 2] Reference temperature change rate classification

In Table 2, for example, when the setting is 0, the transition from the combustion state to the standby state, that is, the stop command of the CO sensor, is based on the change rate of △ 20 degrees, and the transition from the standby state to the combustion state, that is, The drive start command of the CO sensor is based on the rate of change of △ 25 degrees, thereby preventing the drive circuit from being repeatedly turned on and off due to vertical fluctuation near these temperatures.

Similarly, at the time of setting 1, the transition from the combustion state to the standby state is based on the rate of change of about 25 degrees, and the transition from the standby state to the combustion state is based on the rate of change of about 30 degrees. In the case of the transition from the combustion state to the standby state, the change rate is △ 3
With reference to 0 degree, the transition from the standby state to the combustion state is based on the change rate of 35 degrees, and in the case of setting 3, the transition from the combustion state to the standby state is based on the change rate of 35 degrees. The transition from the state to the combustion state is based on the change rate of 490 degrees. These data are also calculated in advance according to the situation. Therefore, depending on the situation, the user or the administrator does not need to calculate the reference value from scratch, but only needs to select the optimum value from the above.

The reference data in Tables 1 and 2 are selectively designated by the DIP switch 102, and the start / stop of the driving of the CO sensor is controlled based on the designated reference data. Therefore,
It is possible to flexibly cope with a standard that fluctuates depending on the type of the gas combustion device to be connected, the combustion state of the gas combustion device, the installation environment, and aging. In addition, it is possible to prevent wasteful power consumption due to the use of a fixedly set reference in all situations and reduction in the life of the CO sensor due to wasteful operation. In addition, since it can be selectively specified, the reference can be set easily and reliably.

The processing flow of the present invention for controlling the driving of the CO sensor based on the criteria shown in Tables 1 and 2 will be described with reference to flowcharts shown in FIGS. FIG. 4 is a flowchart according to the first embodiment of the present invention, and shows processing performed by the control unit in FIG. 3 based on the reference exhaust temperature shown in the data of Table 1. Here, we substitute Table 1
The case of setting 0 will be described.

In FIG. 4, when AC power is supplied to the water heater monitoring device 1 in step S101 (Y in step S101), power is supplied from the power supply circuit 111 to each unit of the water heater monitoring device 1 and the power is supplied. Power is also supplied to the water heater 2 via the circuit 111 and the water heater power control circuit 106, and the process proceeds to S102.

In step S102, the aforementioned RA
Information indicating the standby state is set in a state storage area provided in a part of M and storing information indicating either the combustion state or the standby state.

In the ignition processing of step S103,
After judging from the signal from the flow sensor 107 that the water heater 2 is in use, the burner control circuit 108 is controlled to ignite the burner 7 and the fan drive circuit 109 is controlled to rotate the fan 8. . This allows
The air from the fan 8 and the gas from the gas supply pipe 10 are burned in the burner 7. In the heat exchanger 6 disposed above the burner 7, the water sent from the water suction pipe is brought to a predetermined temperature. Boil.

When step S103 is completed, step S
In step S104, the temperature sensor driving circuit 104 responds to a command from the control unit 101.
Is started, the measurement of the exhaust gas temperature is started by the temperature sensor 5, and the routine goes to the next step S105.

In step S105, the exhaust gas temperature detected by the temperature sensor 5 is received, and in step S1
Shift to 06. In step S106, it is checked whether or not the content of the status storage area is a standby status. If it is determined in step S106 that the apparatus is in the standby state (Y in step S106), step S10
Move to 7.

In step S107, it is determined whether or not the exhaust gas temperature is equal to or higher than 45 degrees Celsius. If it is not determined in step S107 that the exhaust gas temperature is equal to or higher than 45 degrees Celsius (N in step S107), the process returns to step S105 in a standby state, and loops from step S105 to step S107 until the temperature reaches 45 degrees or higher. repeat. If it is determined in step S107 that the exhaust gas temperature is 45 degrees Celsius or higher (step S10)
7) Y), the process proceeds to step S108 to shift to the combustion state.

In step S108, information indicating a combustion state is set in the state storage area, and the flow advances to step S109. That is, the state shifts from the standby state to the combustion state.
In, a drive start command is issued to the CO sensor drive circuit 3, power supply to the CO sensor 4 is started, and the CO sensor is driven. Then, control goes to a step S110.

In step S110, a monitoring process of the CO concentration is performed. Here, basically, it is determined whether or not the CO concentration detected by the CO sensor 4 is equal to or higher than the reference concentration, and information indicating the determination result is stored in the predetermined area of the RAM. If it is determined in step S110 that the CO concentration is equal to or higher than the reference concentration, the result of the determination is written in a predetermined area of the RAM, and step S110 is performed.
Move to 111.

If it is not determined in step S111 that there is an abnormality from the information stored in the predetermined area of the RAM (N in step S111), step S111 is performed to continue the exhaust gas temperature / temperature check and the CO concentration monitoring process.
Return to 105. If it is determined in step S111 that there is an abnormality (Y in step S111), the process proceeds to step S111.
The process proceeds to an abnormality process of step 112.

In the abnormality processing in step S112,
The alarm unit 105 issues an abnormality alarm and controls the solenoid valve driving circuit 105 to shut off the solenoid valve 9 provided in the gas distribution pipe, extinguish the burner 7, and further control the water heater power control circuit 106. By controlling, the power supply to the water heater 2 is stopped, and the process ends.

Returning to step S106, if it is determined from the contents of the state storage area that the combustion state and the standby state are present (N in step S106), the flow proceeds to step S113. In step S113, the exhaust temperature is set to 40 degrees Celsius.
It is determined whether it is below the degree. If step S1
If it is not determined in step 13 that the exhaust gas temperature is equal to or lower than 40 degrees Celsius (N in step S113), it is in the combustion state, and there is no need to change the state. Therefore, the processing shifts to step S110 to monitor the CO concentration. . If step S
If it is determined in 113 that the exhaust gas temperature is equal to or lower than 40 degrees Celsius (Y in step S113), the process proceeds to step S114 to shift to the standby state.

In step S114, information indicating the combustion state is set in the state storage area, and the flow shifts to step S115. That is, the state shifts from the combustion state to the standby state, and accordingly, in step S115, a drive stop command is issued to the CO sensor drive circuit 113 to stop the power supply to the CO sensor. Then, the process proceeds to the abnormality process in step S112 and ends.

Although the above processing flow is for setting 0, the same processing flow can be applied to setting 1, 2 or 3 only by changing the temperature parameters in steps S107 and S113. In accordance with the setting of the DIP switch 102, the control unit 101
07 and the temperature parameters in step S113 are changed,
The processing flow as shown in FIG. 4 is executed.

As described above, according to the first embodiment,
It is possible to flexibly cope with a fluctuating temperature standard depending on the type of the gas combustion device to be connected, the combustion state of the gas combustion device, the installation environment, and aging. Therefore, it is possible to prevent useless power consumption due to the use of a fixed reference in all situations and reduction in the life of the CO sensor due to useless operation. In addition, since it can be selectively specified, the reference can be set easily and reliably.

FIG. 5 is a flowchart according to the second embodiment of the present invention, and shows the processing performed by the control unit in FIG. 3 based on the reference exhaust gas temperature change amount shown in the data of Table 2. Here, the case of setting 0 in Table 2 will be described instead.

In FIG. 5, step S201 is performed.
Steps S204 to S204 are completely the same as steps S101 to S104 in FIG.

In step S205a, the exhaust gas temperature detected by the temperature sensor 5 is received, and this data is
The exhaust gas temperature is stored in a part of the AM, and after a predetermined time, for example, one minute, is received again in step S205b, and the change amount △ (degree / minute) is calculated in step S205c. Move to

In step S206, it is checked whether or not the contents of the state storage area are in a standby state.
If it is determined in step S206 that the apparatus is in the standby state (Y in step S206), the process proceeds to step S207.

In step S207, it is determined whether or not the amount of change in the exhaust gas temperature is equal to or greater than 25 degrees / minute. If it is not determined in step S207 that the exhaust gas temperature change amount is equal to or more than the change amount of 25 degrees / minute (N in step S207), the process proceeds to step S20 in the standby state.
Returning to 5a, the loop of steps S205a to S207 is repeated until the change amount becomes 25 degrees / minute or more.
If it is determined in step S207 that the amount of change in exhaust gas temperature is equal to or more than 25 degrees / minute (step S2).
(Y of 07), the process proceeds to step S208 to shift to the combustion state.

In step S208, information indicating the combustion state is set in the state storage area, and the flow shifts to step S209. That is, the state shifts from the standby state to the combustion state, and accordingly, in step S209, a drive start command is issued to the CO sensor drive circuit 3 and C
Power supply to the O sensor is started, and the CO sensor is driven. Then, control goes to a step S210.

In step S210, a monitoring process of the CO concentration is performed. Here, basically, it is determined whether or not the CO concentration detected by the CO sensor 4 is equal to or higher than the reference concentration, and information indicating the determination result is stored in a predetermined area of the RAM. If it is determined in step S210 that CO
If it is determined that the density is equal to or higher than the reference density, the result of the determination is written in a predetermined area of the RAM, and step S211
Move to

If it is not determined in step S211 that there is an abnormality from the information stored in the predetermined area of the RAM (N in step S211), the exhaust gas temperature change amount temperature check and the CO concentration monitoring process are continued. It returns to step S205a. If it is determined in step S211 that there is an abnormality (Y in step S211), the process proceeds to abnormality processing in step S212. Step S21
In the abnormality process 2, an alarm is issued by the alarm unit 105, and the electromagnetic valve drive circuit 105 is controlled to shut off the electromagnetic valve 9 provided in the gas distribution pipe to extinguish the burner 7 and further supply hot water. The power supply control circuit 106 is controlled to stop the power supply to the water heater 2, and the process is terminated.

Returning to step S206, if it is determined from the contents of the state storage area that the combustion state and the standby state are present (N in step S206), the flow proceeds to step S213. In step S213, it is determined whether the amount of change in the exhaust gas temperature is equal to or less than the change amount of 20 degrees / minute. if,
In step S213, the amount of change in exhaust gas temperature is 20
If it is not determined that it is less than degree / minute (step S2
13) N), it is in the combustion state, and there is no need to change the state. Therefore, the process shifts to step S210 to monitor the CO concentration. If it is determined in step S213 that the exhaust gas temperature change amount is equal to or less than the change amount of 20 degrees / minute (Y in step S213), step S213 is performed to shift to the standby state.
Proceed to 214.

In step S214, information indicating the combustion state is set in the state storage area, and the flow shifts to step S215. That is, the state shifts from the combustion state to the standby state, and in step S215, a drive stop command is issued to the CO sensor drive circuit 113 to stop the power supply to the CO sensor. Then, the process proceeds to the abnormal process in step S212 and ends.

Although the above-described processing flow is for setting 0, even for setting 1, 2, or 3, the same processing flow as described above can be applied only by changing the change amount parameters in step S207 and step S213. . In accordance with the setting of the dip switch 102, the control unit 101 changes the change amount parameters in step S107 and step S113, and executes the processing flow as shown in FIG.

In FIGS. 4 and 5, the termination process relating to burner extinguishing and fan stoppage performed at the end of use of the water heater is omitted.

As described above, according to the second embodiment,
It is possible to flexibly cope with a reference exhaust gas temperature change amount that fluctuates depending on the type of the connected gas combustion device, the combustion state of the gas combustion device, the installation environment, and aging. Therefore, it is possible to prevent wasteful power consumption due to the conventionally used fixed reference in all situations and shortening of the life of the CO sensor due to wasteful operation. In addition, by using a specific temperature change amount as a reference, that is, by monitoring temperature fluctuation, in some cases, a state change can be detected earlier than when a specific temperature value is used as a reference. The driving of the CO sensor can be effectively controlled.

[0069]

As described above, according to the first aspect of the present invention, the designating means (102) selectively designates a value to be reference temperature information from a plurality of pieces of temperature information having different values. The setting means (101-
3) sets reference temperature information. Then, based on the set reference temperature information, a CO sensor (4) for detecting a CO concentration is driven and controlled to monitor and control the gas combustion device (2). Therefore, it is possible to flexibly cope with a standard that fluctuates depending on the type of the gas combustion device to be connected, the combustion state of the gas combustion device, the installation environment, and the aging. As a result, conventionally, wasteful power consumption due to the use of a fixed reference in all situations, and C
It is possible to prevent the life of the O sensor from being shortened. In addition, the designation means (1
02), the reference can be set easily and reliably.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, in addition to the plurality of specific temperatures, the optimum reference value is predetermined by the designating means (102) according to the situation. You can specify a selection from among the values. Therefore, the reference can be easily and reliably selected according to the situation. In addition, by using a specific temperature value as a reference, it is possible to more easily and reliably provide an effective reference temperature according to a situation.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the designating means (102) sets an optimum reference value according to the situation for a plurality of predetermined time intervals. Can be designated for selection from among the temperature change amounts. Therefore, the reference can be easily and reliably selected according to the situation. Further, by using the specific temperature change amount as the reference, it is possible to control the CO sensor drive more quickly and more effectively before reaching the specific reference temperature, based on the degree of the change.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a monitoring device for a gas combustion device of the present invention.

FIG. 2 is a block diagram showing an embodiment in a case where the monitoring device for a gas combustion device according to the present invention is connected to a gas combustion device of a gas water heater.

FIG. 3 is a block diagram showing a configuration of the monitoring device for a gas combustion device of the present invention shown in FIG. 2;

FIG. 4 is a flowchart illustrating an outline of a process performed by a control unit in FIG. 3 in the first embodiment of the present invention.

FIG. 5 is a flowchart illustrating an outline of a process performed by a control unit in FIG. 3 in a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CO gas detection apparatus 2 Water heater 3 Exhaust port 4 CO sensor 5 Temperature sensor 6 Heat exchanger 7 Burner 8 Fan 9 Gas solenoid valve 10 Gas supply pipe 101 Control part 102 Dip switch 103 CO sensor drive circuit 104 Temperature sensor drive circuit 105 Solenoid valve drive circuit 106 Water heater power supply control circuit 107 Flow sensor 108 Burner control circuit 109 Fan drive circuit 110 Alarm unit 111 Power supply circuit

Continuation of the front page (71) Applicant 000161998 Keiyo Gas Co., Ltd. 2- 8-8 Ichikawaminami, Ichikawa-shi, Chiba (71) Applicant 000006895 Yazaki Sogyo Co., Ltd. 1-4-28 Mita, Minato-ku, Tokyo (72) Inventor Masaru Matsuno Inside Yazaki Keiki Co., Ltd., 23 Minamikashima, Futamata-cho, Tenryu-shi, Shizuoka Prefecture (72) Inventor Mayumi Ito 23 Yazaki Keiki Co., Ltd. (23) Inventor Tetsuji Morita 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Inside Osaka Gas Co., Ltd. (72) Tatsunori Hara Chuo-ku, Osaka-shi, Osaka 4-1-2 Hiranocho Osaka Gas Co., Ltd. F-term (reference) 2G060 AA03 AB08 AE19 AE33 BA03 BC02 HC08 HC10 3K003 EA02 FA01 FA05 GA03 TA01 TB04 TB07 TC08

Claims (3)

[Claims] An exhaust gas temperature sensor for detecting the temperature of exhaust gas discharged from a gas combustion device, and a comparison for comparing the temperature detected by the exhaust gas temperature sensor with reference temperature information for judging a combustion state. Means, a CO sensor driving means for driving a CO sensor for detecting a CO gas contained in the exhaust gas based on a comparison result of the comparing means, and the gas combustion device based on a CO concentration detected by the CO sensor. A monitoring unit for a gas combustion device, comprising: a control unit that performs monitoring control of the gas combustion device; a designation unit that selectively designates a value to be the reference temperature information from a plurality of pieces of temperature information having different values; A setting device for setting the reference temperature information based on a specified value. A monitoring device for a gas combustion device, comprising: 2. The monitoring device for a gas combustion device according to claim 1, wherein the plurality of pieces of temperature information having different values are a plurality of specific temperature values predetermined according to a situation. 3. The monitoring apparatus for a gas combustion apparatus according to claim 1, wherein the plurality of pieces of temperature information having different values are temperature change amounts per a plurality of predetermined times predetermined according to a situation. .