JPH07103467A - Safety device for combustion instrument - Google Patents

Abstract

PURPOSE:To provide a safety device,(capable of being easily attached to combustion instruments, by a method wherein the safety device is provided with a chamber provided in a chimney, a gas sensor arranged in the chamber, and an operation unit operating the output value of the gas sensor and providing an outside part with an output signal. CONSTITUTION:A safety device 10 is constituted utilizing a chimney or preferably the main body 11 of connecting member of the chimney. A chamber 12 is provided at the inside of a projected part on the half way of the main body 11 so that the upper side thereof is projected preferably when the device 10 is connected to the chimney 8 while a gas sensor 13 is mounted on the inner wall of the chamber 12. The gas sensor 13 is connected to the operating and indicating unit 17 of an outside part while the operating and indicating unit 17 is provided with an operating unit 18 and an alarm indicating unit 17. The operating unit 18 receives the output value of the gas sensor 13 and detects the concentration of CD at that time to analyze data for determining whether alarming is necessitated or not. The alarm indicating unit 19 receives the output signal of the operating unit 18 and lightens an alarm lamp, for example.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device which can be attached later to a gas-fired or oil-fired hot water heater or a bath heater.

[0002]

2. Description of the Related Art In such a combustion device, a gas harmful to the human body such as carbon monoxide may be generated due to incomplete combustion or the like accompanying the combustion. As a measure against such generation of harmful gas, a combustion device in which a safety device for detecting the generation of toxic gas and stopping the combustion is built in is becoming popular.

[0003]

However, many of the combustion equipments currently in widespread use do not have such a safety device incorporated therein.
For example, if incomplete combustion occurs, carbon monoxide is generated in the exhaust gas, which is dangerous.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a safety device for a combustion device which can be easily attached to a combustion device such as a water heater.

[0005]

According to the present invention, the above object is to achieve a chamber chamber provided in a chimney of a combustion device, a gas sensor disposed in the chamber chamber, and an output value of the gas sensor. It is achieved by a safety device for a combustion device, which includes an arithmetic unit for providing an output signal to the outside.

Further, according to the present invention, the above object is to provide a connecting member main body connected to a chimney of a combustion device, a chamber provided in the connecting member main body, and a gas sensor arranged in the chamber. This is achieved by a safety device for a combustion device, which is provided in a chimney section and which has a calculation section that calculates an output value of the gas sensor and gives a predetermined external output.

Preferably, an arithmetic unit for receiving the output signal of the gas sensor and an alarm display unit for receiving an output signal from the arithmetic unit and displaying an alarm can be provided at a place different from the chimney.

The combustion stop signal may be sent to the control unit of the combustion equipment via the arithmetic unit in accordance with the output signal of the gas sensor.

Further, the gas sensor is connected directly or via an arithmetic unit, and a power supply cutoff means to which a power plug of a combustion device is connected is provided, and the gas sensor detects a predetermined gas concentration in exhaust gas. In this case, the power supply cutoff means can be configured to stop the power supply to the combustion equipment.

[0010]

According to the above construction, a safety device including a chamber and a gas sensor can be incorporated when installing a chimney of a combustion device. Further, even in a combustion device that is not equipped with a safety device, the safety device including the chamber chamber and the gas sensor can be incorporated simply by modifying the existing chimney.

In particular, if the main part of the safety device is provided on the chimney connecting member, the safety device can be incorporated by a simple operation of mounting the chimney connecting member on the existing combustion equipment.

Further, by providing an alarm display section which can be connected to the gas sensor or the calculation section thereof which constitutes this safety device, separately from these, a necessary alarm is issued when carbon monoxide or the like reaches a predetermined concentration. It can be displayed.

Furthermore, if the gas sensor or the arithmetic unit constituting this safety device is connected to the control unit for controlling the operation of the combustion equipment, the poisonous gas has a predetermined concentration via this control unit. When it does, the operation of the combustion equipment can be stopped.

Further, by connecting the gas sensor or the arithmetic unit constituting this safety device to the power supply cutoff means of the combustion equipment, the power supply to the combustion equipment is stopped when the toxic gas reaches a predetermined concentration. Then you can stop driving.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is not limited to these aspects unless otherwise stated. It is not limited to.

1 and 2 show preferred embodiments of the essential parts of a safety device for a combustion device according to the preferred embodiment of the present invention, and FIGS. 3 and 4 show connection examples thereof, respectively. ing.

In FIG. 3, a gas water heater 1 as a combustion device is installed indoors, and a case 2 has a combustion chamber 4 accommodating, for example, a large number of Bunsen type burners 3, and this combustion chamber. A heat exchanger 5 is provided which heats water introduced from the outside by a burner in 4 into hot water.

A fan 6 made of, for example, a sirocco fan or the like is provided below the combustion chamber 4 so as to supply combustion air to the combustion chamber 4. This air is introduced into the equipment from the outside of the water heater 1. Further, an exhaust passage 7 is provided above the heat exchanger 5, and combustion exhaust gas is exhausted from the chimney 8 to the outside through the exhaust passage 7.

Further, the chimney 8 passes through the ceiling A indoors as shown in the figure and extends to the back of the ceiling. In this attic, the chimney 8 extends horizontally,
Combustion exhaust is discharged to the outside. The main body of the safety device described later is attached to a portion of the chimney that extends upward from the water heater 1, a portion that extends horizontally in the ceiling, a bent portion of the chimney, or the like.

A control board 9 is built into the water heater 1, and the control board 9 is operated so that hot water having a temperature set by, for example, a remote controller is produced. However, in such a water heater 1, under various conditions such as lack of oxygen due to blockage of exhaust gas, the burner 3
May cause incomplete combustion to generate carbon monoxide (CO).

This carbon monoxide is used in the exhaust passage 7 and the chimney 8.
Exhaust gas leaks indoors through the gap between the exhaust passage 7 and the chimney 8 or the gap between the connection points in the middle of the chimney 8 or the place where these connection points are disconnected, etc. , People inside this room may develop various abnormal symptoms related to poisoning. For this reason, in the present embodiment, the safety device 10 is attached later to, for example, the water heater 1 as a combustion device already installed indoors.

FIG. 1 is a schematic sectional view showing such a safety device 10. In the figure, the safety device 10 is a chimney,
It is preferably constructed by using the main body 11 of the chimney connecting member. The main body 11 of this chimney connecting member is made of iron or SUS and is formed into a tubular shape, and its inner diameter is configured to substantially coincide with the chimney 8. This body 11
Both ends 15, 16 are slightly reduced in diameter, and are connected to the chimney 8 through connecting means such as O-rings 14, 14 for sealing.

In the middle of the body 11, preferably the chimney 8
A chamber chamber 12 is provided inside the protrusion so that the upper side thereof projects when connected to the chamber chamber 12. The gas sensor 13 is attached to the inner wall of the chamber chamber 12. Therefore, since the component gases contained in the combustion exhaust gas passing through the chimney 8 are sufficiently mixed inside the chamber 12, the gas sensor 13 arranged in the chamber 12 must detect the accurate gas concentration. You can do it.

In this embodiment, since the chamber 12 is provided above the chimney connecting member 11, the chimney 8
The gas sensor 13 is prevented from getting wet even if the drain flows through the pipe.

As the gas sensor 13, for example, a catalytic combustion type CO sensor is preferably used. This gas sensor 13
Is connected to an external calculation display unit 17. The calculation display unit 17 is provided with a calculation unit 18 and an alarm display unit 19.

As will be described later, the arithmetic unit 18 receives the output value of the gas sensor (CO sensor) 13 and outputs the CO value at that time.
In addition to detecting concentration, data analysis will be performed to determine whether necessary alarms, etc. should be issued. The alarm display unit 19 is provided separately from the calculation unit 18 in the calculation display unit 17 or a remote controller (not shown), and receives an output signal from the calculation unit 18, for example, lights an alarm lamp or the like.
Instead of or in addition to this, an alarm buzzer (not shown) is sounded.

Therefore, the safety device 10 of this embodiment is
It can be easily attached to the chimney portion of a combustion device such as a water heater without such a device. That is, the end portions 15, 16 of the chimney connecting member body 11 of the safety device 10
Is inserted into a predetermined portion of the middle part of the chimney 8,
Can be installed. Then, by a simple work of connecting the connection terminal of the CO sensor 13 to the separate display calculation unit 17, the safety device can be easily retrofitted to the combustion device that does not have the safety device.

When the safety device 10 is constructed, the chimney connecting member does not necessarily have to be used as described above.
If a chamber is formed in the middle of the chimney, the gas sensor can be attached to it, so this method can be used to extend the chimney, attach it to the tip of the chimney, or partially attach the chimney. The safety device may be configured without removing it.

2 and 3 show an example in which a safety device is provided in the middle of such a chimney, FIG. 3 is an exploded perspective view thereof, and FIG. 4 is a sectional view of a main part. In the figure, reference numeral 85
Shows the middle of the existing chimney, and a through hole 86 is formed in the upper surface of the chimney 85 in the drawing. A safety device 87 is attached in accordance with the through hole 86. The safety device 87 includes a chamber chamber 88 that defines a predetermined space, and a base portion 87 that is provided below the chamber chamber and that has a shape along the curved surface of the outer periphery of the chimney 85.

A CO sensor 9 is provided in the chamber 88.
0 is accommodated, and this CO sensor 90 is connected to the outside through a substrate 91 having a calculation unit. This safety device 87, as shown in FIG.
A sealing member 92 conforming to the shape of the base 89 around the hole 86 of the
It is designed to be attached airtightly via.

The above-mentioned safety device 10 is used as a safety device to be installed when a water heater or the like is installed, in addition to a combustion device such as an existing water heater that is not equipped with a safety device. It is clear that you can do it.

FIG. 4 shows a modification of the safety device 10 described above, and since the configuration of the same reference numeral as that of the safety device 10 of FIG. 1 is common, duplicated description will be omitted. In the case of this safety device 20, the calculation unit 18 is provided as a sensor substrate on the back side of the gas sensor 13 rather than being formed as a separate display calculation unit as in the safety device of FIG. Therefore, in the calculation unit 28, the gas sensor 13
In response to the output signal of, the predetermined data analysis is performed.

FIG. 5 shows a safety device 93 at the bend of the chimney 8.
1 and FIG. 2, the portions denoted by the same reference numerals as those of the embodiment of FIG. In the case of this embodiment, the partition wall 94 corresponds to the bent portion of the chimney 8 as shown in the drawing.
It is bent 90 degrees to have an R-shaped cross section, and a partition hole 94 is provided with a through hole 94a. As a result, the exhaust gas passing through the chimney 8 passes through the hole 94a and comes into contact with the CO sensor 13 inside the chamber 12. In this way, the safety device 93 can be provided by effectively utilizing the space of the bent portion of the chimney 8.

The safety device 93 shown in FIG.
If the cross section is formed straight as shown in FIG. 6, it can be directly attached to the linear portion of the chimney 8.

The water heater 1 shown in FIG. 7 is an example in which the safety device 20 is retrofitted to the existing water heater as described above. In this case, the calculation unit 28 of the safety device 20 has the chimney as described above. It is provided as a sensor substrate on the back side of the CO sensor 13 of the connecting member body 11 or the like, preferably via a heat insulating structure. Therefore, the arithmetic unit 28 sends a stop signal to the control board 9 of the water heater 1 which does not have an existing safety device.

As a result, when the CO concentration in the exhaust gas in the chimney 8 of the water heater 1 reaches a dangerous concentration, an alarm is issued or the operation of the water heater 1 is stopped. It should be noted that a fixed concentration is determined in advance with respect to the CO concentration detected by the CO sensor 13, and when the determined concentration is reached, the calculation unit 28 of the safety device 20 sends a stop signal to the control unit 9 of the water heater 1. By sending
The safe operation of the water heater 1 can be easily performed.

Furthermore, in addition to such a simple safe operation, in this safety device, CO
More precise safe operation can be performed in response to changes in concentration. That is, FIG. 11 shows that when a person is placed indoors in an atmosphere containing a constant concentration of CO gas,
It shows how blood hemoglobin increases in relation to time.

In the figure, even if the CO concentration in the air is low, the blood CO hemoglobin increases, and depending on the blood CO hemoglobin concentration, the person in the room changes from a slight symptom such as "headache" to " Various symptoms can be exhibited, even severe ones such as "rapid death".

That is, when hemoglobin bound to carbon monoxide exceeds 25% of hemoglobin in blood, a dangerous state is reached. The time to reach this dangerous state becomes short when the CO concentration in the atmosphere is high. CO in the atmosphere
Even if the concentration is low, when a person is exposed to the atmosphere for a long time, the blood hemoglobin concentration bound to carbon monoxide gradually increases, and becomes a dangerous state after a certain period of time.

Under these conditions, the hot water supply device 1 of FIG. 9 is connected to issue an alarm or stop combustion when the CO concentration in the exhaust gas of the hot water supply device 1 becomes dangerous. The safety device 10 is configured as shown in FIG. 12, for example.

On the control board 9 of the water heater 1 connected to the CO sensor 13, the CO concentration detecting section 31 to which the detection signal from the CO sensor 13 is given and the CO concentration detecting section 3 are provided.
1 is connected to the ratio calculation integration unit 32, the attenuation correction unit 33 connected to the ratio calculation integration unit 32, an alarm output unit 34, and an alarm means 36 to which the alarm output unit 34 is connected.
And a combustion stopping means 35, and the combustion stopping means 35 is connected to the attenuation correction unit 33.

The CO concentration detector 31 is adapted to detect the CO concentration at every unit detection time t during the combustion operation of the water heater 1. For example, when the unit detection time t is 10 seconds, the CO detection value from the CO sensor 13 is sampled every one second, and the sampled value is simply or weighted and the averaged value is the CO of the unit detection time t. The concentration is used as the concentration, and this CO concentration detection value is added to the ratio calculation integration unit 32.

The ratio calculating / integrating unit 32 obtains a weighting ratio ER described later and an integrated value TR of the weighting ratio ER. As is clear from the graph of FIG. 9, C in the air
The proportion of CO taken into the blood varies depending on the O concentration, and the concentration of CO gas that is emitted into the exhaust gas when the water heater 1 burns varies temporally.

In view of such a situation, the present embodiment detects the CO concentration in the exhaust gas at each unit detection time t, integrates the amount of CO taken into the blood at each unit detection time t, and By making a more accurate determination of the CO concentration of medium hemoglobin, the safety accuracy against CO gas poisoning is improved.

In calculating the weighting ratio ER, first, when a person is exposed to an atmosphere of the CO concentration detected at the unit detection time t, the time for the blood hemoglobin CO concentration to reach a predetermined dangerous reference concentration. Calculate T from the given data. The data for obtaining the time T to reach this dangerous reference concentration is created based on the simulation graphs shown in FIGS. 11 to 13 in which the blood hemoglobin CO concentration is shown with time as a variable.

FIG. 11 is a graph showing, as a function of time, an increasing state of the hemoglobin CO concentration in the blood of a person inside the closed chamber when CO gas of 1000 ppm is constantly supplied to the closed chamber. From this graph, the time to reach a blood hemoglobin concentration of 25%, which is usually set as a standard for dangerous concentrations, is calculated as about 24 minutes, and the time to reach a safer 10% concentration of blood hemoglobin concentration lower than this is calculated. It is calculated as about 13.5 minutes.

FIG. 12 shows a state in which the blood hemoglobin CO concentration increases when 2000 ppm CO gas is constantly supplied into the closed chamber. It takes about 14.5 minutes for the blood hemoglobin CO concentration to reach 25%. It takes about 7.5 minutes to reach a 10% concentration. No. 9 shows an increase state of blood hemoglobin CO concentration when 3000 ppm of CO gas was constantly supplied to the closed chamber. At this time,
It takes 11 minutes for the blood hemoglobin CO concentration to reach 25%, and about 5.5 minutes for the 10% concentration.

When the dangerous standard concentration of the hemoglobin CO concentration in blood is set, it may be set to 25% which is a normally adopted value, but in the present embodiment, in order to improve safety,
The dangerous standard concentration of blood hemoglobin CO concentration is set to 10%. Based on the simulation graphs of FIGS. 11 to 9, as shown in FIG. 14, the horizontal axis represents CO in the exhaust gas.
A coordinate is set with the amount and the vertical axis being the time T until the dangerous standard concentration is reached. By plotting each CO amount and the value of the time T which becomes the dangerous reference concentration for the CO amount on these coordinates and connecting the plotted points, the graph data for obtaining the time T for any detected CO concentration is created. The data is given to the ratio calculation integration unit 32.

In the simulation graph of FIG. 13, when the CO gas is 3000 ppm, the time T at which the blood hemoglobin CO concentration reaches the dangerous reference concentration is about 5.5 minutes, and the exhaust CO of the graph data of FIG. Gas 3
At 000 ppm, it takes about 0.5 minutes, and both values do not match.

In this embodiment, the CO gas concentration is 3000
When it becomes ppm, it is a very abnormal and dangerous state, and the exhaust CO concentration is 1000 pp in order to ensure the safety and to easily calculate the graph data as a straight line.
2 points W of m and 2000ppm simulation graph
A graph obtained by connecting 1 and W2 is adopted as the graph data shown in FIG. If you give this graph data,
It is also possible to obtain a regression graph instead of a straight line, and a weighted curve graph may be adopted and used as graph data.

Based on the graph data of FIG. 14, the ratio calculating / accumulating unit 32 determines that the hemoglobin CO concentration in blood is 10% when the CO concentration per unit detection time added from the CO concentration detecting unit 31 is exposed to the CO concentration. The time T at which the dangerous standard concentration is reached is calculated. Next, the ratio t / T between the unit detection time t and the time T to reach the dangerous concentration is calculated as the weighting ratio ER.

This ratio ER is defined as a ratio of the time T to reach the dangerous reference concentration when exposed to the atmosphere of the detected CO concentration.
The time t has already been spent, and only the remaining T-t indicates that there is a margin of safety for the CO concentration. The ratio calculating unit 32 integrates the weighting ratio ER for each unit detection time t to obtain the ratio of the total blood hemoglobin CO concentration to the dangerous reference concentration when exposed to the atmosphere of each CO concentration.

When the integrated value of the weighting ratio becomes 1, it means that the blood hemoglobin CO concentration becomes 10% which is the dangerous standard concentration. The integrated value of this weighting ratio is added to the alarm output unit 34. The alarm output unit 34 is previously provided with a first alarm reference value and a second alarm reference value corresponding to the integrated value TR of the weighting ratio ER.

When the integrated value of the weighting ratios by the ratio calculation / integration unit 32 reaches the first alarm reference value, the alarm output unit 34 outputs the first alarm signal and reaches the second alarm reference value. Sometimes a second alarm signal is output. These warning signals are applied to the combustion stopping means 35 and the external warning means 36, respectively.

When the first alarm signal is applied, the alarm means 36 displays a blinking lamp or the like, for example, via the remote controller of the water heater 1, and when the second alarm signal is applied, the buzzer sounds. And so on. When the first alarm signal is applied from the alarm output unit 34, the combustion stopping means 35 temporarily closes the gas valve or the like of the water heater 1 for a predetermined short time to stop the combustion, and the attenuation correction unit 3
Add a combustion stop signal to 3.

Further, the combustion stopping means 35 has an alarm output section 34.
When the second alarm signal is added from, the combustion of the water heater 1 is completely stopped. Further, when the first alarm signal is added to the combustion stopping means 35 to temporarily stop the combustion of the water heater 1, the combustion stopping means 35 performs a reset operation when a predetermined time has elapsed, so that the combustion operation of the water heater 1 is started. Start again.

When the decay correction unit 33 receives a combustion temporary stop signal from the combustion stopping means 35, the decay correction unit 33 performs the decay correction of the integrated value of the weighting ratio immediately before the combustion of the water heater 1 is stopped. That is, when the combustion of the water heater 1 is temporarily stopped, the CO gas in the room leaks to the outside through a slight gap during the combustion stop period, and the CO gas concentration in the room decreases. In order to take this into consideration, in the present embodiment, the integrated value TR of the weighting ratio before the combustion stop is multiplied by the damping constant Q. This damping constant Q is

[0058]

[Equation 1]

## EQU3 ## K is an assumed ventilation frequency per hour while combustion is stopped, and is 0.2, for example, from experience.
And so on, given by a number. Further, tL is the time from when the combustion is stopped to when the combustion operation is restarted after the next reset.

By this attenuation correction by the attenuation correction unit 33, the integrated value of the weighting ratio is corrected to a value that actually matches. When the damping correction is performed by the damping correction unit 33, the ratio calculation integration unit 13 uses the integrated value of the damping-corrected weighting ratio as a base when the water heater 1 starts the combustion operation next time. After the combustion is restarted, the weighting ratio ER obtained for each unit detection time is added to the above value.

The attenuation constant Q can be obtained by Laplace conversion or by giving a table in advance. Further, the constant K is given as 0.2 as an example of a highly airtight condominium, but if the setting can be changed according to the type of house in which the combustion equipment is installed, a more appropriate safe operation can be performed.

Next, the operation during safe operation of the water heater 1 shown in FIG. 7 will be described with reference to the flowchart of FIG. First, when the faucet of the water heater 1 is opened (ST5
0), in ST51, it is determined whether the integrated value TR of the weighting ratio is smaller than zero.

When the water heater 1 is first burned, the integrated value TR of the weighting ratio is zero, so at that time, ignition is performed (ST52), and the CO sensor 13 and CO
In addition to detecting the CO concentration by the concentration detector 31, the ratio calculating / integrating unit 32 detects the CO gas concentration at each unit detection time t, calculates the weighting ratio ER, and integrates the weighting ratio TR (ST53). ).

Next, in ST54, it is determined whether or not the numbers 1 to 3 are set in the flag A. At the time of the first burning, the number is not standing on Flag A,
At ST55, it is determined whether the integrated value TR of the weighting ratio is smaller than 0.7.

When TR is smaller than 0.7, the routine proceeds to the next step, where it is judged whether or not the tap is closed (ST56). When the hot water tap is not closed, hot water supply and combustion are continued, and the operation from ST53 is repeated. When the hot water tap is closed, a normal fire extinguishing operation is performed to stop hot water supply combustion (ST57).

Further, when the integrated value TR of the weighting ratio becomes 0.7 or more in ST55, this T is set in ST58.
It is determined whether R is smaller than 0.8. When TR is smaller than 0.8, flag A is set to 1 (ST59). At this time, the alarm output unit 34 outputs the first alarm signal, and the alarm display means 36 sounds a predetermined alarm display or a buzzer. At the same time, the combustion stop means 35 outputs a combustion stop signal and sends it to the combustion control section of the control board 9 to temporarily stop the combustion of the water heater 1 (ST60).

At the same time as this temporary stop of combustion, the hot water faucet is closed (ST61). Then, after a lapse of a predetermined time from the stop of the combustion of the water heater, the sequence program of the hot water supply operation is reset in ST62, and the faucet of the hot water supply is opened again in ST50 to start the combustion. In addition, ST
While hot water supply combustion is temporarily stopped at 60 and ST62 is reset, the attenuation correction unit 33 performs attenuation correction on the integrated value TR of the weighting ratio before combustion stop as described above. Then, the operation after ST51 is repeated.

During this operation, the flag A is set to 1 in ST54.
When it is determined that any of the numbers up to 3 is set, it is determined in ST63 whether or not the number of the flag A is 1, and when the number of the flag A is not 1, it is 2 in ST67. Whether or not it is determined. ST6
When it is determined that the flag is set to 1 in 3, it is determined whether the integrated value TR of the weighting ratio is less than 0.8 (ST64), and when TR is less than 0.8, The operation after ST56 is performed.

On the other hand, when the weighting ratio TR is 0.8 or more, the integrated value T of the weighting ratio is calculated in ST65.
It is determined whether R is smaller than 0.9. Even if TR is determined to be 0.8 or more in ST58, the determination in ST65 is performed. When TR is less than 0.9, that is, when TR is 0.8 or more and less than 0.9, flag A is set to 2 (ST
66), the operation after ST60 is performed.

When it is determined in ST67 that the number 2 is set in the flag A, it is determined in ST68 whether TR is smaller than 0.9, and TR is 0.
When it is determined that the number is 9 or more, TR is 1 in ST70.
Is less than or equal to. The determination in ST70 is similarly made when TR is determined to be 0.9 or more in ST65. When TR is smaller than 1, flag A is set to 3 (ST71) and ST60.
The subsequent operation is performed.

When it is determined in ST67 that the number 2 is not set in flag A, TR is set in ST69.
Is determined to be less than 1, and when TR is determined to be less than 1, the operation in and after ST56 is performed, and when TR is determined to be 1 or more, the alarm output unit 3
4 outputs a second alarm signal.

As a result, an alarm such as a display or a buzzer is issued by the alarm means, and a stop signal is output to the combustion control section of the control board 9 by the combustion stop means 35 to surely stop the combustion of the water heater 1. . The combustion stop of the water heater 1 is similarly performed when TR is determined to be 1 or more in ST70, or when TR is determined to be 0 or less in ST51.

Thus, according to the water heater of FIG. 7, CO
The weighted ratio of the detected CO concentrations and the integrated value thereof are calculated for each unit detection time t of the concentration, and it is determined whether or not the blood hemoglobin CO concentration becomes the dangerous reference concentration based on the integrated value TR of the weighted ratio. It Therefore, even when the CO concentration in the exhaust gas fluctuates during the combustion operation of the water heater 1, it is possible to accurately incorporate this factor of variation to judge the dangerous state of the blood hemoglobin CO concentration.
The safety against O 2 gas poisoning will be greatly enhanced.

Further, when the first alarm signal is output and the water heater 1 is temporarily stopped in combustion, the value of the integrated value TR of the weighting ratio before the stop of combustion is attenuated and corrected. Since the weighting ratios for each unit detection time t after the start of combustion are integrated based on the attenuation-corrected weighting ratio integrated value, blood hemoglobin is obtained by the more realistic weighted ratio integrated value TR. Since the dangerous state of the CO concentration is judged, the reliability of the safe operation of CO gas poisoning can be improved.

FIG. 8 shows another example of connection of the safety device to the water heater 1. In the figure, this water heater 1
The safety device 20 shown in FIG. 2 is connected to the. That is, in this case, the calculation unit 28 of the safety device 20 is fixed as a sensor substrate on the side of the chimney 8 adjacent to the gas sensor 13. The power supply / interruption device 25 is mounted as a commercial power supply in, for example, a household power outlet.

This power supply / interruption device 25 includes a water heater 1
By inserting the power plug of S1 as S1, the power required for operating the water heater 1 is supplied.
A calculation unit 28 of the CO sensor 13 is connected to the power supply / interruption device 25, and as described later, the CO sensor 1
Based on the detection result of No. 3, the power supply of the water heater 1 is cut off when necessary.

Therefore, in this case, the safety device 20 is attached by connecting the chimney connecting member main body 11 to the extension of the chimney of the existing water heater, and then the power supply / interruption device 25 is connected to the computing unit 28 and the water heater 1. The safety device can be easily equipped only by connecting or inserting the lines S1 and S2 respectively.

FIG. 16 shows an example of a block configuration centering on the arithmetic unit 28 and the power supply / interruption device 25 in this embodiment. That is, in this configuration, FIG.
Unlike the above case, the CO concentration detection unit 31
And a ratio calculation integration unit 32 and an attenuation correction unit 33. Further, the power supply cutoff device 25 side is provided with a power cutoff unit 41 in addition to the alarm output unit 34 and the alarm means 36. The alarm output unit 34 and the alarm means 36 may be configured separately.

Here, the parts designated by the same reference numerals as those in the block diagram of FIG.
Receives a signal from the alarm output unit 34 according to the CO concentration,
It operates so as to cut off the power supply of the water heater 1 to stop its operation.

FIG. 17 is a flow chart showing the safe operation of the water heater of FIG. 17, parts that perform the same operations as those in the flowchart of FIG. 16 are denoted by the same reference numerals, and redundant description will be omitted.

In this case, the ratio calculating / accumulating unit 32
When TR is determined to be 1 or more in ST51, or when TR is determined to be greater than 1 in ST60 and ST70, the power cutoff unit 41 cuts off the power supply by the power supply cutoff device 25 to supply hot water. It is designed to stop vessel 1.

As described above, even in this embodiment, as shown in FIG.
Similarly to the configuration of (1), even when the CO concentration in the exhaust gas fluctuates during the combustion operation of the water heater 1, it is possible to accurately incorporate this factor of fluctuation to determine the dangerous state of the blood hemoglobin CO concentration. , The safety against CO gas poisoning is remarkably enhanced.

The present invention is not limited to the above embodiment. It is obvious that the combustion equipment to which the present invention is applied can be applied not only to the gas combustion type as described above, but also to an oil combustion type water heater, a bath kettle, and the like.

[0084]

As described above, according to the present invention, there is provided a safety device for a combustion device which can be easily additionally attached to a combustion device such as a water heater without a safety device. be able to. Further, it is possible to provide a safety device for a combustion device that can be easily attached when installing a combustion device such as a water heater.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing the configuration of a preferred embodiment of a safety device for a combustion device according to the present invention.

FIG. 2 is a schematic perspective view showing a configuration in which a safety device is connected in the middle of an existing chimney.

FIG. 3 is a sectional view of a main part of the safety device in FIG.

FIG. 4 is a schematic sectional view showing a modification of the safety device of FIG.

FIG. 5 is a schematic cross-sectional view showing an example of a configuration in which a safety device is provided on a bent portion of a chimney.

6 is a schematic cross-sectional view showing a configuration in which the safety device of FIG. 5 is applied to a linearly extending portion of a chimney.

7 is a diagram showing an example of connection of the safety device of FIG. 2 to a combustion device.

8 is a diagram showing another example of connection of the safety device of FIG. 2 to a combustion device.

FIG. 9 is a graph showing the relationship between CO concentration in air and hemoglobin CO concentration in blood.

10 is a block diagram showing the configuration of the safety device of FIG. 7. FIG.

FIG. 11 is graph data for determining the time T at which the blood hemoglobin CO concentration reaches a dangerous standard concentration when a person is exposed to 1000 ppm of CO gas.

FIG. 12 is graph data for determining the time T at which the blood hemoglobin CO concentration reaches a dangerous standard concentration when a person is exposed to 2000 ppm of CO gas.

FIG. 13 is graph data for determining the time T at which the blood hemoglobin CO concentration reaches a dangerous reference concentration when a person is exposed to 3000 ppm CO gas.

FIG. 14 is a diagram showing the relationship between CO concentration in air and hemoglobin CO concentration in blood.

15 is a flowchart showing a safe operation of the embodiment shown in FIG.

16 is a block diagram showing a configuration of the safety device of FIG.

FIG. 17 is a flowchart showing a safety operation of the embodiment of FIG.

[Explanation of symbols]

 1 Hot Water Heater 8 Chimney 10, 20 Safety Device 13 Gas Sensor (CO Sensor) 11 Chimney Connection Member Main Body 12 Chamber Chamber 18, 28 Arithmetic Section A Ceiling

Claims (5)

[Claims] 1. A chamber chamber provided in a chimney of a combustion device, a gas sensor disposed in the chamber chamber, and a calculator for calculating an output value of the gas sensor and giving an output signal to the outside. A safety device for combustion equipment. 2. A connecting member main body connected to a chimney of a combustion device, a chamber provided in the connecting member main body, a gas sensor placed in the chamber, and an output of the gas sensor provided in the chimney portion. A safety device for a combustion device, comprising: a calculator that calculates a value and gives a predetermined external output. 3. An arithmetic unit for receiving the output signal of the gas sensor, and an alarm display unit for receiving an output signal from the arithmetic unit and displaying an alarm, are provided at locations different from the chimney section. The safety device for a combustion device according to claim 1 or 2. 4. The combustion stop signal is sent to a control unit of a combustion device via an arithmetic unit in accordance with an output signal from the gas sensor, according to claim 1 or 2. Safety device for the combustion equipment of. 5. The gas sensor is connected directly or via an arithmetic unit, and a power supply cutoff unit to which a power plug of a combustion device is connected is provided, and the gas sensor detects a predetermined gas concentration in exhaust gas. The power supply cutoff means is configured to stop the power supply to the combustion equipment when detected.
Alternatively, the safety device for the combustion device described in 2.