JPH0763329A - Operation inspecting method of co sensor in burner equipped with co sensor - Google Patents

Abstract

PURPOSE:To simplify the inspecting work of operation of a CO sensor even in a burner equipped with the CO sensor, in which a plurality of burners are arrayed. CONSTITUTION:A damper 21 is retained to the feeding air inlet port 20 of a combustion fan 19 through screws 22a, 22b to arrange the same slidably around the supporting point of the screw 22a so as to be capable of changing the passage area of ventilation. Upon the inspection of operation of a CO sensor 6, the concentration of generated CO is increased only by closing the damper 21 by a predetermined amount while the abnormality of the CO sensor 6 and the safety operation system of the same can be inspected by a condition whether safety operation in accordance with the concentration of generated CO is effected or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CO sensor operation inspection method for a CO sensor-equipped combustor equipped with a CO sensor for detecting the concentration of CO gas (carbon monoxide) in exhaust gas.

[0002]

2. Description of the Related Art Combustors such as water heaters, bath heaters, and heaters that use gas or petroleum as fuel are used to generate CO
In order to prevent the danger of gas (carbon monoxide gas), a CO sensor is arranged on the exhaust side of the combustor, and the CO sensor is
When a gas is detected and a CO detection concentration in exhaust gas reaches a predetermined concentration, an alarm is issued, or when the CO detection concentration further increases to reach a dangerous concentration, combustion is stopped.
Some have safety measures taken so that CO safe operation is performed according to the detected concentration.

A failure of such a CO sensor causes a serious accident that may be fatal to humans. Therefore, the operation of the CO sensor is usually inspected when the combustor is shipped, and after the combustor is installed, it is necessary. The CO sensor operation is being checked.

C in such a combustor with a CO sensor
FIG. 9 shows a conventional example of a method of inspecting an O sensor. The one shown in the same figure is disclosed in Japanese Patent Laid-Open No. 51-142728, and the output side of the CO sensor 6 that generates a voltage according to the concentration of CO gas in the combustion exhaust gas is
A control circuit 7 for a safety valve 5 that opens and closes the fuel passage 4 and a control circuit 8 for an alarm 9 are connected in parallel via a normally closed switch 10 and a normally open switch 11, respectively. These normally closed switch 10, normally open switch 11, control circuits 7 and 8,
The CO safety operation system 2 is composed of the alarm device 9 and the safety valve 5. In addition to the air amount adjusting damper 24 that variably adjusts the primary air amount at the air port of the burner 1, the air introduction amount is not impaired during normal burner combustion, and the air of the burner 1 is checked during the operation check of the CO sensor 6. An inspection damper 3 for variably adjusting the mouth opening degree is provided. The inspection damper 3 is operated by the inspection operation body 12, and the inspection damper 3 is rotated so that the opening degree of the air port of the burner 1 is reduced.
When is operated, the normally closed switch 10 opens and the normally open switch
11 is configured to close.

When the operation of the CO sensor 6 is inspected, the opening of the air inlet of the burner 1 is temporarily reduced by the operation of the inspection operation body 12 as described above to reduce the primary air amount to the burner 1 to be normally opened. Incomplete combustion is performed with the switch 11 closed.

In this way, the CO gas in the exhaust gas increases,
If the CO generation concentration reaches a predetermined concentration and the alarm device 9 sounds,
The CO sensor 6 and the CO safe operation system 2 are normal, and if the alarm 9 does not sound, it can be understood that they are abnormal.

In recent years, burner devices for combustors such as water heaters are less and less composed of only one burner 1 as shown in FIG. 9, and as shown in FIG. A burner configured by combining the burners 1 is generally used. C having a plurality of such burners 1
In the water heater with O sensor, C
When the O sensor 6 is to be inspected, each burner 1 of the plurality of burners 1 must be provided with an inspection damper 3 and an inspection operation body 12 for operating each inspection damper 3 must be provided. However, there is a problem that not only the device configuration becomes complicated but also the inspection operation becomes complicated, and it takes a lot of time to inspect the CO sensor.

Therefore, as a method for solving such a problem, for example, as in the water heater shown in FIG. 8, an air port at each burner position of a burner row in which a plurality of burners 1 are arranged.
An opening 14 having a plurality of narrow openings 14a is provided on the 17 side so as to face the air opening 17, and the large diameter hole 14b of the nozzle damper 46 is aligned with the air opening 17 of each burner 1 during normal combustion. When the CO sensor 6 is inspected, the nozzle damper 46 may be shifted downward to match the narrow opening 14a side with the air port 17 of the burner 1 to reduce the amount of air and cause incomplete combustion. To be

When this system is adopted, the CO safety operation by the CO sensor is not performed by switching the switches 7 and 8 as shown in the conventional example, and an alarm device operates according to the CO generation concentration. The operation such as the combustion stop is automatically performed.

When checking the operation of the CO sensor of the combustor with a CO sensor having the above structure, first remove the front cover (not shown) of the water heater during combustion operation, and then loosen the screw 15 of the burner front cover 16. Remove the burner front cover 16 and check operation screw 13
By loosening a and 13b and shifting the nozzle damper 46 downward, the air port of the burner 1 is partially closed, and the primary air amount to the burner 1 is reduced. In this state, the inspection operation screws 13a and 13b are tightened to fix the nozzle damper 46, the burner front lid 16 is attached again, and the screw 15 is tightened and fixed. In such a state, the presence or absence of an abnormality in the CO sensor 6 and the CO safe operation system 2 is checked depending on whether or not the CO safe operation is performed by temporarily causing incomplete combustion.

[0011]

However, in the above-described method of inspecting the operation of the CO sensor, the front cover and the burner front lid 16 are removed and the inspection operation screws 13a and 13b are loosened as described above at the time of inspection. It is troublesome to shift the inspection damper 3 and tighten and fix it with the inspection operation screws 13a and 13b, and then cause incomplete combustion with the front cover 16 of the burner attached again. lid
16, remove the inspection operation screws 13a and 13b, return the inspection damper 3 to the fixed position, tighten and fix it with the inspection operation screws 13a and 13b, attach the burner front cover 16, and then attach the front cover. Since the reverse operation must be performed, a very troublesome work is required.

The present invention has been made to solve the above problems, and an object of the present invention is to easily perform operation inspection of a CO sensor even in a combustor with a CO sensor in which a plurality of burners are arranged. It is to provide a method of checking the operation of a CO sensor that can be performed.

[0013]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention is equipped with a combustion fan for supplying / exhausting, a CO sensor is installed on the exhaust side of the combustor, and a CO safe operation is performed according to the CO detection concentration of the CO sensor. In the machine, the passage area of the ventilation is variable at least at one position of the air passage from the air inlet of the combustor to the front of the burner during combustion of the combustor and the air passage on the downstream side of the burner. Check the presence or absence of abnormality in the CO sensor and CO safe operating system by checking whether or not the CO safe operation corresponding to the CO clean concentration is performed by narrowing or closing with a damper of the formula to increase the CO clean concentration. Further, instead of the damper, the ventilation passage is narrowed by applying a passage closing jig to the opening on at least one side of the air supply port and the exhaust outlet of the ventilation system passage. Closed to increase the CO occurrence density is also a characteristic structure of the present invention.

[0014]

In the present invention having the above-mentioned structure, in order to check the operation of the CO sensor, at least one of the air passage from the air supply inlet to the front of the burner and the air passage on the downstream side of the burner in order to increase the CO generation concentration. A variable passage opening / closing type damper or a passage closing jig at a certain position is used to reduce the passage area for ventilation to temporarily cause incomplete combustion. Whether or not the CO sensor and the CO safe operation system are abnormal is inspected depending on whether or not the safe operation of the CO sensor corresponding to the CO generation concentration at this time is performed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) show the configuration of a first embodiment for carrying out a CO sensor operation inspection method in a combustor with a CO sensor according to the present invention.

FIG. 8B shows a combustion fan for a water heater with a CO sensor in which a plurality of burners shown in FIG. 8 are arranged.
FIG. 9 is a schematic diagram showing a mode in which a variable passage opening / closing damper 21 is arranged on the air supply inlet 20 side of 19. That is, in the example shown in FIG. 8, the inspection damper 3 as the operation inspection means of the CO sensor is provided at the air port of the burner 1, but in the present embodiment, the supply of the combustion fan 19 in the blower system of the water heater is supplied. It is characterized in that a damper 21 is arranged on the air inlet 20 side as a CO sensor operation checking means.

FIG. 1 (a) shows in detail how the damper 21 is attached to the combustion fan 19. In the combustion fan 19, the damper 21 for varying the passage area of the ventilation is slidably arranged at the air supply inlet 20 for taking in the air supplied to the burner 1. A slit 25 is opened in the damper 21, and the damper 21 is locked to the combustion fan 19 by a screw 22a at the base end portion 27 and a screw 22b inserted in the slit 25. Loosen the screw 22b a little to move the damper 21 along the groove 23 of the combustion fan 19, and tighten the screw 22b at a desired position to fix the damper 21 to the combustion fan 19 to partially block the air supply inlet 20. Thus, the passage area of ventilation can be set to a desired size, and the opening degree of the air supply inlet 20 at this time is indicated by the scale 18.

As shown in FIG. 2, a safety control circuit 45 is connected to the CO sensor 6, and the safety control circuit 45 has a predetermined CO concentration depending on the movement amount of the damper 21. When the alarm CO is reached, the alarm device 9 is actuated, and when the CO generation concentration rises to reach a dangerous concentration, the safety valve 5 that opens and closes the fuel passage 4 is closed to stop combustion.
Control is performed so that a CO safe operation corresponding to the CO generation concentration is performed. The alarm device 9, the safety valve 5, and the safety control circuit 45 constitute a CO safety operation system 44 of this embodiment.

Next, a method of inspecting the operation of the CO sensor of the first embodiment constructed as described above will be explained. First, remove the front cover (not shown) of the water heater during combustion operation,
Loosen the screw 22b and move the damper 21 to reduce the opening degree of the air supply inlet 20, and fix the damper 21 by tightening the screw 22b at a position corresponding to the opening degree for operating the alarm device 9.
If incomplete combustion occurs in this state, the CO gas concentration in the exhaust gas rises, reaching the level at which the alarm device 9 operates, and C
If the O sensor 6 detects it and the alarm 9 operates by the voltage generated by the CO sensor 6, the CO sensor 6 and the C sensor
It can be seen that the operation of the O safe operation system 44 is normal. Further, if the alarm device 9 does not operate, it can be seen that the CO sensor 6 is abnormal.

Next, when checking whether or not the CO detection concentration of the CO sensor 6 becomes a dangerous concentration and the combustion stop operation is performed, the screw 22b is loosened again and the damper 21 is moved to move the intake port 20. The opening degree is further reduced, and the damper 21 is fixed by tightening the screw 22b at a position corresponding to the opening degree that causes the combustion stop to further increase the CO gas concentration.
If the CO gas concentration rises to a level that causes combustion stop and the voltage generated in the CO sensor 6 stops combustion, it is checked that the CO sensor 6 and the CO safe operation system 44 operate normally, It can be seen that the CO sensor 6 has an abnormality if it is not stopped.

After the inspection, loosen the screw 22b, move the damper 21 to a fixed position where the gas is completely combusted, and then tighten the screw 22b to attach the front cover.

According to this embodiment, in order to increase the concentration of CO generated by incomplete combustion during the operation inspection of the CO sensor 6, as described above, the front cover is removed and then the damper is used.
21 may be closed. Compared with the troublesome work operation of removing the front cover and the front cover 16 of the burner, shifting the inspection damper 3 and then attaching the front cover 16 of the burner again as in the example shown in FIG. Inspection operation becomes easy. Further, after the inspection, it is only necessary to return the damper 21 to the fixed position and attach the front cover, and according to this embodiment, the inspection work is remarkably simplified.

FIGS. 3A and 3B show a jig used in the second embodiment according to the present invention. The parts shown in (a) and (b) of the figure function as a ventilation opening / closing jig by being applied to the air supply inlet 20 of the combustion fan 19, respectively. Like the damper 21, the ventilation passage area is changed. The one shown in (a) of the figure is formed small as the alarm plate 27, and the one shown in (b) of the figure is formed large as the combustion stop confirmation plate 28.

When checking the operation of the CO sensor, if the alarm plate 27 is applied to the air supply inlet 20 of the combustion fan 19 during the combustion operation,
When the CO generation concentration reaches a level at which the alarm device is activated, and when the combustion stop confirmation plate 28 is applied to the air supply inlet 20, C
The O generation concentration reaches the level at which combustion is stopped. These C
Whether or not there is an abnormality in the CO sensor 6 and the CO safe operation system 44 is inspected depending on whether or not the CO safe operation corresponding to the O generation concentration is performed.

Therefore, in the case of this embodiment as well, the operation of the CO sensor is inspected by the simple work of simply applying the jigs 27, 28 to the air supply inlet 20 as described above. The same effect as the example is achieved.

FIGS. 4A to 4E show a third embodiment according to the present invention. In the case of this embodiment, a back wind stop 30 disposed in the exhaust pipe 29 on the exhaust outlet 43 side of the water heater shown in FIG. 1B as shown in FIGS. 4A to 4E. Is used to increase the CO generation concentration when the CO sensor is inspected. This back wind stop 30 is provided at the exhaust outlet 43.
The air entering from the side is prevented from entering the burner 1, and the air flow from the combustion fan 19 is prevented from flowing backward. The back wind stop 30 has a structure in which a damper plate 48 is pivotally supported by a shaft 32, and when combustion is stopped, (a) in FIG.
As shown in (b), the exhaust port 33 is closed by its own weight of the damper plate 48, but during combustion, the exhaust port 33 is normally fully opened and the ventilation passage area is large as shown in (c) of the same figure. Becomes

On the other hand, in order to increase the CO generation concentration, the rod 31 for adjusting the opening degree of the damper plate 48 is fixed to the upper side of the damper plate 48 in a vertically movable manner by a desired means. A scale 34 is marked on this rod 31,
The reference point 47 for measuring the scale 34 is (d) in FIG.
It is installed as shown in (e).

Next, the inspection operation of the CO sensor will be specifically described. As shown in (d) of the same figure during the combustion operation, if the rod 31 is moved downward and the rod 31 is fixed when the scale value Sa coincides with the reference point 47, the CO generation concentration activates the alarm device. After reaching the level, the rod 31 is further moved downward as shown in FIG.
When the rod 31 is fixed at the point where the value coincides with, the CO generation concentration reaches a level at which combustion is stopped. Whether or not there is an abnormality in the CO sensor 6 and the CO safe operation system 44 is inspected depending on whether or not the safe operation according to the CO generation concentration is performed.

In the case of this embodiment, it is not necessary to remove the front cover when the operation of the CO sensor 6 is inspected.
It is possible to check whether or not the CO safety operation corresponding to the CO generation concentration is performed by increasing the CO generation concentration by a simple work of simply moving the 31 up and down, and the inspection work is further simplified as compared with the above-mentioned embodiments. .

A fourth embodiment is shown in FIG. 5 (a). In the structure shown in the figure, the damper plate 48 of the back windbreak 30 is formed in an L-shape with a magnetic material, and the damper plate outside the exhaust pipe 29 is used.
When the strong magnet 35 is brought close to the position C facing the opening side B of the 48, the damper plate 48 can maintain the closed state of the exhaust port 33, and when the combustion operation is performed in this closed state, the CO generation concentration is The safety operation of the CO sensor is performed so that the safety valve in the fuel passage is shut off. In addition, by moving this magnet 35 to the upper side, the position D
When it is moved to the position, the movement of the damper plate 48 changes the ventilation passage area, and the CO generation concentration reaches a level at which the alarm device is activated, and the magnet 35 is moved to the position E.
When the damper plate 48 is moved to the above position, the passage area of the ventilation is changed due to the movement of the damper plate 48 so that the combustion is stopped, and CO safe operation corresponding to these CO generation concentrations is performed. You can also

Also in the case of the fourth embodiment, when checking the CO sensor, it is necessary to check whether or not the safe operation corresponding to the CO generation concentration is performed by a simple operation of bringing the magnet 35 close to the exhaust pipe 29. , The CO sensor 6 and the CO safe operation system 44 can be inspected for any abnormality, and the same effects as those of the above-described embodiments can be obtained.

FIG. 6 shows a fifth embodiment in which the present invention is applied to an FF type oil fan heater as a combustor. In the figure, the rotation of the combustion fan 19 causes the air supply pipe to
The air taken in through 36 air inlets 36a is burner 1
The gas is heated by the gas combustion, and the heated air heats the heat exchanger 38 and warms the air in the room. Exhaust gas in the exhaust pipe 37 is discharged to the outside through the exhaust port 37a. The exhaust port 37a is formed inside the air supply inlet 36a, as shown in FIG. 7A when viewed from the side (c) of FIG. As shown in FIG. 6, the CO sensor 6 is arranged on the outlet side of the heat exchanger 38, and is connected with a CO safe operation system 44 (not shown) as in the above-mentioned embodiments. In this embodiment, when the operation of the CO sensor 6 is inspected, as shown in (b) and (c) of FIG.
Stretchable bellows closure that acts as a damper on 37a
39, 40 are opened and closed to a desired area to change the passage area of ventilation, or the closing plates 41a, 41b, 42a, 42b as passage closing jigs shown in (e) of FIG. The area of the passage for ventilation is changed by applying the pressure to the exhaust port 37a.

When inspecting the CO sensor, the closure 39 or 40
Is opened by a predetermined area, or the closing plate 41a is connected to the exhaust port 37a or the closing plate 42a as shown in FIG.
Is applied to the air supply inlet 36a, the CO generation concentration reaches a level at which the alarm device is activated. In addition, closures 39
Alternatively, the CO generation concentration reaches a level at which the combustion operation is performed by further opening a predetermined amount of 40, or by applying the closing plate 41b to the exhaust port 37a or the closing plate 42b to the air supply inlet 36a. The CO sensor 6 and the CO safe operation system 44 depend on whether or not the CO safe operation corresponding to these CO generation concentrations is performed.
Check for any abnormalities.

In the case of this embodiment, the closing tool 39 is opened or closed or the closing plate 41 is used when checking the operation of the CO sensor.
It is possible to increase the CO generation concentration by varying the passage area of ventilation simply by applying a, 41b, 42a, 42b. Therefore, also in the case of this embodiment, the inspection work can be carried out very simply as in the above-mentioned embodiments.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in each of the above-described embodiments, the water heater and the oil fan heater have been described as examples, but the CO sensor inspection operation method of the present invention can be applied to other combustors such as heaters and bath heaters.

Further, in each of the above embodiments, the air inlet or exhaust portion of the combustor is partly blocked by various means to change the passage area of the ventilation, but the air inlet to the front of the burner is changed. A desired means for varying the passage area of the ventilation may be provided at any position of the ventilation passage up to, or the ventilation passage on the downstream side of the burner.

Further, in the above embodiments, the damper 21, the alarm plate 27, the combustion stop confirmation plate 28, the closures 39, 40, the closure plates 41a, 41b, 42a,
Although 42b is used, a valve that functions as a damper or a passage closing jig is provided at at least one position of the air passage, and a valve opening amount is set by connecting a motor to drive the throttle or open the valve. By making it possible to automatically adjust, the operation inspection of the CO sensor 6 becomes easier.

Further, in each of the above-mentioned embodiments, the alarm device is operated or the combustion is stopped as the CO safety operation, but it is possible to operate only one of them.
Alternatively, when the combustor is installed indoors, a CO generation concentration lower than the level at which the alarm device operates is newly set as the low level reference concentration, and when the CO generation concentration reaches this low level reference concentration, Even if these operations are used as CO safe operation by rotating the ventilation fan to ventilate the room, or by increasing the rotation of the combustion fan 19 of the device body to suppress the generation of CO to a low level. Good.

Further, when the combustor is installed indoors,
A damper may be provided in the middle of the chimney connected to the exhaust stack 29 to change the passage area of ventilation.

Further, in each of the above embodiments, the combustion fan 19
Although the position is provided on the upstream side of the burner 1, the operation check of the CO sensor can be performed by a similar method even if the combustion fan 19 is provided on the downstream side.

[0041]

According to the present invention, the ventilation passage is provided with a damper or a passage closing jig at at least one position of the ventilation passage from the air inlet of the combustor to the front of the burner and the ventilation passage on the downstream side of the burner. Since the CO generation concentration is increased by closing or throttling with the CO sensor, even in the case of a combustor with a CO sensor in which multiple burners are arranged, the front cover was removed when checking the operation of the CO sensor. After that, remove the front lid and shift the inspection damper, and without the complicated work of installing the burner front lid and then performing incomplete combustion, just close the damper or apply the passage closing jig. Thus, incomplete combustion can be caused to increase the CO generation concentration, and the inspection work becomes simple.

[Brief description of drawings]

FIG. 1 shows the CO in a combustor with a CO sensor according to the present invention.
It is a front view which shows the structure of the 1st Example which performs the operation | movement inspection method of a sensor.

FIG. 2 is an explanatory diagram of a safe operation system of a CO sensor.

FIG. 3 is a perspective view of a jig used in a second embodiment according to the present invention.

FIG. 4 is an explanatory diagram showing a third embodiment according to the present invention.

FIG. 5 is an explanatory diagram showing a fourth embodiment according to the present invention.

FIG. 6 is an explanatory diagram showing a configuration of an FF type oil fan heater.

FIG. 7 is an explanatory diagram showing a fifth embodiment according to the present invention.

FIG. 8 is an explanatory diagram showing an example of performing a CO sensor operation inspection method in a combustor with a CO sensor having a plurality of burners.

FIG. 9 is an explanatory diagram showing a conventional example for performing a CO sensor operation inspection method in a CO sensor-equipped combustor having a single burner.

[Explanation of symbols]

 1 Burner 6 CO sensor 19 Combustion fan 20 Air supply inlet 21 Damper 27 Alarm plate (passage closing jig) 28 Combustion stop confirmation plate (passage closing jig) 33 Exhaust port 44 CO safe operating system

Claims (2)

[Claims] 1. A combustion fan for supply / exhaust is provided, and a CO sensor is installed on the exhaust side of the combustor.
CO designed to perform CO safe operation according to O detection concentration
In a combustor with a sensor, at the time of combustion of the combustor, at least one position of the ventilation passage from the air inlet of the combustor to the front of the burner and the ventilation passage on the downstream side of the burner determines the passage area of ventilation. CO is increased or decreased by using a variable passage open / close damper to increase the CO generation concentration, and whether CO safe operation corresponding to the CO generation concentration is performed or not
Check for abnormalities in the sensor and CO safe operation system C
A method for checking the operation of a CO sensor in a combustor with an O sensor. 2. The CO generation concentration is increased by narrowing or closing the ventilation passage by applying a passage closing jig to the opening on at least one side of the air supply passage and the exhaust outlet of the ventilation passage instead of the damper. The operation inspection method of a CO sensor in a combustor with a CO sensor according to claim 1, characterized in that.