JP4098916B2 - Incomplete combustion prevention device for combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an incomplete combustion preventing apparatus for combustion equipment, and more particularly to an apparatus for preventing incomplete combustion in hot water equipment such as a water heater using a CO sensor.
[0002]
[Prior art]
Conventionally, as a system for preventing incomplete combustion of a water heater using a CO sensor, as shown in FIG. 7, a CO sensor 3 is incorporated in a water heater 1a, and the CO concentration in exhaust gas is directly detected. A CO sensor built-in type in which the water heater 1a is stopped at the time of complete combustion and a CO alarm device 9 are installed separately from the water heater 1a as shown in FIG. 9 is an alarm device interlocking cutoff type that stops the water heater 1 a in conjunction with the motor 9.
[0003]
[Problems to be solved by the invention]
However, the former type with a built-in CO sensor may not be able to incorporate the CO sensor 3 depending on the model of the water heater 1a, and therefore there is a problem that it is not possible to cope with a water heater without the CO sensor 3. . Further, the latter alarm interlocking cutoff type has a problem that CO in the exhaust gas cannot be directly detected, and this alarm interlocking cutoff type has a long exhaust path of the water heater 1a, particularly when there are a plurality of exhaust paths. When passing through the room, it was necessary to attach the CO alarm 9 to each room.
[0004]
The present invention has been made in view of the above points, and an object of the present invention is to adopt a CO sensor interlocking shut-off system that can prevent incomplete combustion in advance, and a combustion device or commercial power source that cannot incorporate a CO sensor. To provide an incomplete combustion prevention apparatus for combustion equipment that can sufficiently cope with non-combustion combustion equipment, another object is to provide an incomplete combustion prevention apparatus for combustion equipment that can improve CO detection performance. Another object of the present invention is to provide an incomplete combustion preventing device for a combustion device capable of improving the CO detection performance and simultaneously reducing an increase in pressure loss.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention attaches a CO sensor 3 for directly detecting the CO concentration in the exhaust gas to the exhaust pipe 2 of the combustion device 1, and the combustion device 1 in conjunction with the CO sensor 3 during incomplete combustion. And an agitating member 10 for agitating the exhaust gas is installed on the side of the inlet 2a of the exhaust cylinder 2, and the agitating member 10 is installed horizontally above the inlet 2a of the exhaust cylinder 2. In this way, it is composed of an inclined plate portion 12 that is gradually inclined upward toward the CO sensor 3 and side plate portions 13 that are suspended from both sides of the inclined plate portion 12. Thus, the stop of the combustion device 1 can be interlocked with the CO sensor 3 mounted in the exhaust pipe 2 so that an accident due to incomplete combustion can be prevented and the CO sensor 3 can be built in. Even had burning appliance 1 can easily attached by retrofitting a CO sensor 3 in the stack 2. In addition, since the stirring member 10 for stirring the exhaust gas is installed on the inlet 2a side of the exhaust tube 2, even when the exhaust gas is not sufficiently mixed at the exhaust outlet of the combustion device 1, the stirring member is located near the inlet 2a of the exhaust tube 2. By installing 10, the exhaust gas can be agitated to improve the CO detection performance. Moreover, the agitating member 10 is provided above the inlet 2 a of the exhaust pipe 2 and is inclined upward as it approaches the CO sensor 3, and the side plate portion 13 is suspended from both sides of the inclined plate portion 12. Therefore, a large amount of exhaust gas can be collected in the inflow portion 6 of the CO sensor 3 by the inclined plate portion 12 and the side plate portions 13 on both sides.
[0006]
According to the invention of claim 2, the agitating member 10 is provided in a tapered manner that is provided above the inlet 2a of the exhaust pipe 2 and gradually inclines upward as it approaches the CO sensor 3 and decreases in width toward the tip. an inclined plate portion 14, tapered sides which is configured by a side plate portion 15 depending from the inclined plate portion 14, the inflow of many exhaust gas tapered inclined plate portion 14 and the side plate portion 15 on both sides of CO sensor 3 While being able to collect in the part 6, the increase in pressure loss by the stirring member 10 can be reduced.
[0007]
According to a third aspect of the present invention, the stirring member 10 is disposed so as to cross the upper part of the inlet 2 a of the exhaust pipe 2, and is bent in a reverse U-shaped longitudinal section that gradually inclines upward toward the CO sensor 3. Since it is composed of the plate 16 , the exhaust gas can be stirred to improve the CO detection performance, and the increase in pressure loss due to the bent plate 16 having an inverted U-shaped longitudinal section can be further reduced.
[0008]
The invention of claim 4, in any one of claims 1 to 3, wherein the CO sensor 3 inlet 6 on the front surface or lower surface of the sensor box 4 for accommodating the outlet portion 7 is provided on the upper surface, the outflow part 7 It is preferable to form a chimney shape. In this case, by making the outflow portion 7 into a chimney shape, an upward air flow caused by hot air (exhaust gas) is generated in the outflow portion 7 and can be forcibly extracted by a so-called chimney effect. Accordingly, the amount of exhaust gas flowing into the sensor box 4 can be increased.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The basic configuration of the present invention will be described below.
[0010]
As shown in FIG. 1, the CO sensor interlocking cutoff system of the present basic configuration is installed in an exhaust pipe 2 of a water heater 1a and directly detects a CO concentration, and a control unit 8 realized by a microcomputer or the like. It consists of.
[0011]
As shown in FIG. 2, the sensor unit 5 is configured such that the CO sensor 3 is housed in a sensor box 4 attached to the sensor attachment part 2 b of the exhaust pipe 2. Note that reference numeral 5a in FIG. 2 (a) denotes an external connection portion of the sensor unit 5, and this is omitted in FIG. 2 (b). The CO sensor 3 directly detects the CO concentration in the exhaust gas, and outputs a detection signal to the control unit 8 when a CO concentration higher than a certain concentration is detected. When the controller 8 determines from the sensor output value that the combustion is incomplete, the water heater 1a is stopped and the alarm LED 30 is turned on.
[0012]
Although the inlet 2a of the exhaust pipe 2 is connected to the exhaust outlet of the hot water heater 1a, since the exhaust gas is not sufficiently mixed at the exhaust outlet of the hot water heater 1a, in this example, the vicinity of the inlet 2a of the exhaust pipe 2 The agitating member 10 for agitating the exhaust gas is installed. In the basic configuration of FIG. 1, the agitating member 10 is configured by a flat plate 11 that is laterally provided so as to cover a part above the inlet 2 a of the exhaust pipe 2 from the side opposite to the sensor mounting portion 2 b of the exhaust pipe 2. . Here, the flat plate 11 protrudes substantially horizontally from the other side 2c facing the sensor mounting portion 2b of the exhaust pipe 2 toward the CO sensor 3 side, and the protruding width thereof partially extends at the inlet 2a of the exhaust pipe 2. The exhaust gas is swirled by the flat plate 11 and guided to the inflow portion 6 side of the CO sensor 3 while being stirred as indicated by the arrows in FIG. In order to reduce an increase in pressure loss due to the flat plate 11, small holes may be provided at several locations on the flat plate 11.
[0013]
Next, as an example of a method for detecting the combustion state, if the exhaust temperature of the sensor unit 5 exceeds a certain value, the combustion state is considered and the CO concentration detection is started. If the ON / OFF signal of the gas solenoid valve 20 in the water heater 1a is obtained, it may be assumed that the gas solenoid valve 20 is opened as a combustion state and the CO concentration detection is started.
[0014]
Further, as a method of stopping the water heater 1a, for the water heater 1a having a commercial power source (100V power source) as shown in FIG. On the other hand, for the water heater 1a without a commercial power source, a gas solenoid valve 20 is separately attached later, and the shutoff of the gas solenoid valve 20 is linked to the CO sensor 3.
[0015]
Moreover, as a method of restarting the stopped water heater 1a, even if this system is operated and the water heater 1a is stopped, the hot water heater 1a is not made usable after that, and a return means for restarting is performed. Is provided. As the return means, for example, a return button provided in the control unit 8 may be manually operated. However, it is preferable that the number of return after the hot water heater 1a is stopped by this system operation is limited to 3 times, for example, and the subsequent return is impossible in consideration of safety.
[0016]
Since the CO sensor 3 for directly detecting the CO concentration in the exhaust gas is attached to the exhaust cylinder 2 of the combustion device 1 and the combustion device 1 is stopped in conjunction with the CO sensor 3 at the time of incomplete combustion, Accidents due to incomplete combustion can be prevented. Moreover, since the CO sensor 3 is mounted not in the hot water heater 1 a but in the exhaust pipe 2, even the hot water heater 1 a in which the CO sensor 3 cannot be built in can be retrofitted with the CO sensor 3. In addition, the hot water heater 1 a with a commercial power source is linked with the CO sensor 3, while the hot water heater 1 a without a commercial power source is linked with the CO sensor 3 by shutting off the gas solenoid valve 20 attached later. It can be used for both models with and without commercial power.
[0017]
Further, since the flat plate 11 is provided in the vicinity of the inlet 2a of the exhaust pipe 2, even when the exhaust gas is not sufficiently mixed at the exhaust outlet of the water heater 1a, the exhaust gas hits the flat plate 11 to form a vortex, and the exhaust gas is shown in FIG. By being guided to the CO sensor 3 side as indicated by the arrow in (a), the CO detection performance can be improved by stirring the exhaust gas while having a simple structure provided with the flat plate 11.
[0018]
According to the experiment results of the present inventor, when the CO concentration after the hot water heater 1a is incompletely burned and the exhaust gas is sufficiently mixed with the flat plate 11 is 1200 ppm, the CO concentration in the exhaust pipe 2 is more than 1200 ppm. When the CO sensor 3 was attached to a low location and the output value of the CO sensor 3 was measured, the sensor output was 700 ppm (a value lower than the uniform concentration by 500 ppm) when the flat plate 11 was not provided. It was found that the sensor output improved to 800 ppm when provided.
[0019]
A stirring member 10 according to an embodiment of the present invention is shown in FIGS.
[0020]
The stirring member 10 shown in the example of FIG. 3 is an inclined plate that is installed above the inlet 2a of the exhaust tube 2 and gradually inclines upward as it approaches the CO sensor 3 and gradually decreases in width toward the tip. It is comprised by the part 12 and the side-plate part 13 suspended from the both sides of the inclination board part 12. FIG. A large amount of exhaust gas can be collected in the inflow portion 6 of the CO sensor 3 by the inclined plate portion 12 and the side plate portions 13 on both sides, and the sensor output can be increased. In order to reduce the increase in pressure loss due to the inclined plate portion 12, it is preferable to provide small holes at several locations on the inclined plate portion 12, and this is also the case in the following embodiments shown in FIGS. is there.
[0021]
The agitating member 10 shown in the example of FIG. 4 is a tapered inclined plate portion that is provided above the inlet 2a of the exhaust tube 2 and gradually inclines upward as it approaches the CO sensor 3 and decreases in width toward the tip. 14 and side plate portions 15 depending from both sides of the tapered inclined plate portion 14. In this example, the tapered inclined plate portion 14 is formed in a mountain shape in plan view. Thus, there is an advantage that a large amount of exhaust gas can be collected in the inflow portion 6 of the CO sensor 3 by the tapered inclined plate portion 14 and the side plate portions 15 on both sides thereof, and the tapered inclined plate portion 14 is further tapered. Therefore, there is an advantage that the area to which the exhaust gas hits can be reduced, and therefore the increase in pressure loss due to the tapered inclined plate portion 14 can be further reduced.
[0022]
The stirring member 10 shown in the example of FIG. 5 is composed of several blade plate portions 17 having a propeller shape. The vane plate portion 17 is formed, for example, in an inverted V-shaped cross section, and the exhaust gas is easily stirred. Further, by making the blade plate portion 17 into a propeller shape, there is an advantage that the area to which the exhaust gas hits is reduced and an increase in pressure loss due to the blade plate portion 17 can be reduced. In addition, each blade plate portion 17 is not limited to being fixed, and may be rotated around a vertical axis. In this case, the rotational force is added to the flow of the exhaust gas so that stirring can be performed more effectively. Become.
[0023]
The stirring member 10 shown in the example of FIG. 6 is a bent plate 16 having an inverted U-shaped longitudinal section that is disposed so as to cross over the inlet 2 a of the exhaust pipe 2 and gradually inclines upward as it approaches the CO sensor 3. It is configured. In this example, the flue gas can be agitated by the inverted U-shaped bent plate 16 to improve the CO detection performance, and the agitating member 10 is configured by the elongated bent plate 16 to reduce the area to which the flue gas hits. Thus, an increase in pressure loss due to the bent plate 16 can be reduced. Furthermore, in this example, the inflow part 6 is provided in the front surface (or at least one of the lower surfaces) of the sensor box 4 which accommodates the CO sensor 3, and the chimney-shaped outflow part 7 is provided in the upper surface. Thus, by making the outflow part 7 into the chimney shape, an upward air flow is generated by the hot air (exhaust gas) inside the outflow part 7 and can be extracted by a so-called chimney effect. Therefore, the exhaust gas from the inflow part 6 of the sensor box 4 Is forced to flow in and the amount of inflow increases, so that the CO detection performance can be further enhanced. Thus, the structure which made the outflow part 7 the chimney-like can be implemented similarly also in the basic structure and each embodiment of the said FIGS. 1-5.
[0024]
In each of the above embodiments, the water heater 1a is exemplified as the combustion device 1, but the present invention is widely applied to other various combustion devices such as a hot water device using the CO sensor 3.
[0025]
【The invention's effect】
As described above, in the invention of claim 1 of the present invention, the CO sensor for directly detecting the CO concentration in the exhaust gas is attached to the exhaust pipe of the combustion equipment, and the combustion equipment is linked to the CO sensor at the time of incomplete combustion. Since control is performed so that the combustion equipment is stopped, it is possible to prevent accidents due to incomplete combustion by linking the stoppage of the combustion equipment with the CO sensor installed in the exhaust stack. In addition, by setting the inside of the exhaust pipe, even a combustion device that cannot incorporate the CO sensor can easily cope with the retrofit of the CO sensor. In addition, since a stirring member for stirring the exhaust gas is installed on the inlet side of the exhaust pipe, a stirring member is installed near the inlet of the exhaust pipe even when exhaust gas is not sufficiently mixed at the exhaust outlet of the combustion equipment. Thus, the CO detection performance can be improved by stirring the exhaust gas. Moreover, the agitating member is composed of an inclined plate portion that is installed above the inlet of the exhaust pipe and is gradually inclined upward toward the CO sensor, and side plate portions that are suspended from both sides of the inclined plate portion. A large amount of exhaust gas can be collected in the inflow portion of the CO sensor by the inclined plate portion and the side plate portions on both sides, and the sensor output is improved.
[0026]
According to a second aspect of the present invention, there is provided a tapered inclined plate portion that is provided above the inlet of the exhaust stack and is gradually inclined upward as it approaches the CO sensor and narrows toward the tip. Since it is composed of side plate parts that hang down from both sides of the tapered inclined plate part, a large amount of exhaust gas can be collected in the inflow part of the CO sensor by the tapered inclined plate part and the side plate parts on both sides of the tapered inclined plate part. In addition to the improvement, by making the tapered inclined plate portion have a tapered shape, the area to which the exhaust gas hits is reduced, and the increase in pressure loss due to the stirring member can be reduced.
[0027]
According to a third aspect of the present invention, the agitating member is arranged so as to cross the upper part of the inlet of the exhaust pipe, and is composed of a bent plate having an inverted U-shaped longitudinal section that gradually inclines upward toward the CO sensor. Therefore, it is possible to improve the CO detection performance by stirring the exhaust gas, and by using a bent plate having an inverted U-shaped longitudinal section, the area where the exhaust gas hits is reduced, and the increase in pressure loss due to the bent plate is further reduced. be able to.
[0028]
The invention of claim 4, in addition to the effects of any crab of claims 1 to 3, inlet, an outlet portion on an upper surface provided on the front surface or the lower surface of the sensor box for housing the CO sensor, outlet section Because of the chimney shape, an upward air flow caused by hot air (exhaust gas) is generated in the outflow part and can be forcibly removed by the so-called chimney effect, which can increase the inflow amount of exhaust gas into the sensor box. CO detection performance can be further enhanced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a basic configuration of the present invention.
FIG. 2A is a perspective view for explaining a mounting state of a CO sensor in the above exhaust pipe, and FIG. 2B is a cross-sectional view.
FIG. 3 is a perspective view of a stirring member according to an embodiment of the present invention .
4A is a perspective view of still another example of the agitating member, FIG. 4B is a plan view, and FIG. 4C is a side sectional view.
FIG. 5 is a perspective view of still another example of the stirring member.
6A is a perspective view of still another example of the agitating member, FIG. 6B is a plan view, and FIG. 6C is a side sectional view.
FIG. 7 is an explanatory diagram of a conventional water heater with a built-in CO sensor.
FIG. 8 is an explanatory diagram of a conventional alarm interlocking cutoff type water heater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Combustion apparatus 2 Exhaust pipe 2a Inlet 2b Sensor attachment part 2c Other side surface 3 CO sensor 4 Sensor box 6 Inflow part 7 Outflow part 10 Stirring member
12 inclined plate portion 13 side plate portion 14 tapered inclined plate portion 15 side plate portion 16 bent plate
20 gas solenoid valve

Claims (4)

In the exhaust pipe of a combustion device, fitted with a CO sensor for detecting the CO concentration in the exhaust gas directly controls so as to stop the combustion apparatus in conjunction with the CO sensor during incomplete combustion, an inlet of the exhaust tube An agitating member for agitating exhaust gas is installed on the side, and the agitating member is installed above the inlet of the exhaust pipe and is inclined upward as it approaches the CO sensor, An incomplete combustion preventing device for a combustion device , comprising: a side plate portion hanging from both sides of the plate portion . A CO sensor for directly detecting the CO concentration in the exhaust gas is attached to the exhaust pipe of the combustion equipment, and the combustion equipment is controlled to stop in conjunction with the CO sensor during incomplete combustion. A stirrer for agitating the exhaust gas is installed on the side, and the stirrer is horizontally installed above the inlet of the exhaust tube, and gradually inclines upward as it approaches the CO sensor and becomes wider toward the tip. a tapered inclined plate portion narrowed, incomplete combustion prevention device of combustion equipment you characterized in that it is composed of a pendent side plates from both sides of the tapering inclined plate portion. A CO sensor for directly detecting the CO concentration in the exhaust gas is attached to the exhaust pipe of the combustion equipment, and the combustion equipment is controlled to stop in conjunction with the CO sensor during incomplete combustion. An agitating member for agitating exhaust gas is installed on the side, and the agitating member is disposed so as to cross the upper part of the inlet of the exhaust tube, and gradually inclines upward as it approaches the CO sensor. incomplete combustion prevention device of combustion equipment characterized in that it consists of a shaped bent plate. The combustion according to any one of claims 1 to 3, wherein an inflow portion is provided on a front surface or a lower surface of a sensor box that houses the CO sensor, an outflow portion is provided on an upper surface, and the outflow portion has a chimney shape. incomplete combustion prevention equipment of equipment.

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