WO1996007056A1

WO1996007056A1 - Combustion equipment for judging abnormality or life

Info

Publication number: WO1996007056A1
Application number: PCT/JP1995/001720
Authority: WO
Inventors: Masanori Enomoto; Naoto Tominaga; Masato Kondo; Tatsuo Fujimoto
Original assignee: Gastar Co., Ltd.
Priority date: 1994-08-31
Filing date: 1995-08-30
Publication date: 1996-03-07
Also published as: KR970704995A; EP0781966A1; CN1159852A

Abstract

Combustion equipment which comprises a burner, a combustion fan for supplying air to and exhausting the burner, and an airflow sensor for detecting air volume flowing in an airflow passage leading to an exhaust passage from an air supply passage to the burner. In the equipment, an air volume judgement value providing a criterion of abnormality or life when the combustion fan is rotated at a predetermined number of revolutions is stored, a windless condition is detected when a variation in air volume detected by the airflow sensor with the combustion fan rotated at zero or a given number of revolutions is within a predetermined allowable range, and at that time abnormality or life is detected in the case where the air volume detected by the airflow sensor with the combustion fan rotated at the predetermined number of revolutions falls below the air volume judgement value. In this manner, whether a relationship between air volume and the number of revolutions of the combustion fan is favorable in a condition not influenced by outside wind can be properly judged to provide correct judgement of abnormality or life.

Description

Specification

TECHNICAL FIELD The present invention relates to combustion control that suppresses emission of harmful substances such as carbon monoxide, hydrocarbons, and nitrogen oxides by using the output of an air flow sensor. It relates to combustion equipment such as water heaters, bath kettles, and heaters that are controlled by controlling the air volume and the amount of fuel supplied. BACKGROUND ART FIG. 15 shows a system configuration of a general water heater as a combustion device. In the figure, a burner 2 is installed below the combustion chamber 1, and a combustion fan 3 for supplying and exhausting air is provided below the burner 2. The combustion fan 3 is provided with a rotation speed detection sensor. Above the combustion chamber 1, a hot water supply heat exchanger 4 is provided. A water supply pipe 5 is connected to the inlet side of the hot water supply heat exchanger 4, and a water supply temperature sensor 6 such as a thermistor for detecting the water supply temperature to the water supply pipe 5 and a water supply flow rate. A water amount sensor 7 to be detected is provided.

A hot water supply pipe 8 is connected to the outlet side of the hot water supply heat exchanger 4, and the hot water supply pipe 8 is connected to the hot water supply pipe 8. A tapping temperature sensor 10 such as a thermistor for detecting the temperature and a water quantity control valve 11 for controlling the tapping flow rate are provided.

The gas supply passage 12 of the burner 2 is provided with a solenoid valve 13 and a proportional valve 14 for controlling a gas supply amount. Further, a pressure introduction port of a pressure introduction pipe 20a, 20b of a differential pressure sensor 16 functioning as an airflow sensor is provided below the burner 2 and the exhaust passage 19. I have. The differential pressure between the space below the parner 2 and the exhaust passage 19 guided by the pressure introducing pipes 20 a and 20 b is detected by the differential pressure sensor 16.

The control unit 15 has a built-in sequence program for controlling the hot water supply operation of the water heater. Further, the control section 15 is provided with a control circuit for controlling the hot water supply operation in accordance with this sequence program. The control unit 15 is provided with the input water temperature sensor 6, the water flow sensor 7, the tap water temperature sensor 10, the differential pressure sensor 16, and a remote control (not shown). Upon receiving the information, the operation of the solenoid valve 13, the proportional valve 14, the combustion fan 3, and the water amount control valve 11 is controlled to perform the hot water supply operation. The water passing through the hot water supply heat exchanger 4 is heated by the combustion of the wrench 2 to hot water having a set temperature set by a remote controller or the like, and the set temperature generated by the hot water supply heat exchanger 4 is obtained. The hot water is guided to a desired hot water supply place such as a kitchen or a bathroom via a hot water supply pipe 8.

During this hot water supply operation, the control unit 15 controls the rotation of the combustion fan 3 in accordance with the combustion capacity (combustion amount) of the parner 2. That is, the control unit 15 performs the combustion control data relating to the gas supply amount and the combustion capacity as shown in FIG. Such air flow (fan rotation speed) and fan rotation control data corresponding to the combustion capacity are given. The required amount of heat for increasing the incoming water temperature to the set temperature is constantly being calculated by the arithmetic circuit in the control unit 15. The opening amount of the proportional valve 14, that is, the gas supply amount, is controlled in accordance with the combustion capacity of the required calorific value and the data in FIG. This valve opening amount is controlled by the valve opening drive current applied to the proportional valve 14. At the same time, the rotation speed of the fan is controlled so that the combustion capacity and the air flow according to the data shown in Fig. 13 are maintained, and the optimal air flow for the burner is supplied to the burner 2. It is.

The control of the air volume is performed based on the differential pressure detection signal of the differential pressure sensor 16. That is, the control section 15 is provided with data on the relationship between the differential pressure of the differential pressure sensor 16 and the air volume (air volume) as shown in FIG. As a result, the actual detected airflow is obtained based on the differential pressure detection value detected by the differential pressure sensor 16. Then, the difference between the required airflow and the actual detected airflow was determined, and the fan rotation speed of combustion fan 3 was controlled in a direction to correct this deviation to zero, and the amount of combustion was matched. Optimal airflow is provided.

When the optimum air flow is supplied in proportion to the amount of combustion, the emission of carbon monoxide, hydrocarbons, and other nitrogen oxides in the exhaust gas due to incomplete combustion is kept low.

Generally, when the water heater is used for a long time, fins and soot are clogged in the fins 9 and the burners 2 of the water heater 4. As this clogging progresses gradually, airflow The air resistance gradually increases, and eventually the air required for burner combustion is not supplied, resulting in abnormalities or life of the equipment.

Conventionally, the abnormality or the life of the appliance is determined based on the number of burners, the burn time, and the like. With such a method, it is difficult to accurately determine the life of the appliance, and despite the fact that the hot water supply heat exchanger 4 and the like have clogged considerably and the combustion state has deteriorated, However, since the number of times of burning and the burning time have not reached the reference values for determining the life, the life is not determined and the water heater may continue to be used as it is. In this case, of course, the amount of carbon monoxide gas generated in the exhaust gas also becomes large, and it is dangerous. On the other hand, despite the fact that the lined water heater maintained a sufficiently good combustion performance, the number of times of burning and the burning time reached the standard values for the life judgment, and it was judged that the life was over. Water heaters may be disposed of. In this case, the water heater cannot be used effectively, which is economically disadvantageous.

The present invention focuses on the differential pressure sensor 16 for controlling the air flow rate of the combustion fan 3, and uses the differential pressure detection signal of the differential pressure sensor 16 to determine the failure of the water heater or the service life. The present invention relates to a combustion device that can accurately perform combustion. Hereinafter, the differential pressure sensor 16 is referred to as an airflow sensor 16 for convenience of explanation.

Figure 16 is a graph showing the relationship between the air volume (output of the air volume sensor 16) and the number of revolutions of the combustion fan. As shown by the solid line in this graph, the number of revolutions of the combustion fan required to obtain a constant air volume can be uniquely obtained. However However, as described above, when the airflow resistance increases, the number of revolutions of the combustion fan required to obtain a constant airflow increases. From a different perspective, this means that the amount of air that can be supplied is reduced when the combustion fan is rotated at a constant speed.

If the relationship between the air volume and the number of revolutions of the combustion fan deviates to some extent from the proper relationship, the present inventors will change the airflow resistance and cause failures such as life of the combustion equipment. We paid attention to the point that we could judge that there was.

However, the present inventor has found that the output from the airflow sensor 16 is affected by the wind from outside where the combustion equipment is installed through the exhaust port 19. Were found.

Further, the present inventors have found that simply changing the relationship between the air flow rate and the fan rotation speed from the normal state may not yet require disposal of the combustion equipment. did. In other words, even if the air volume at the maximum rated speed of the combustion fan is reduced, if the operation is performed with reduced combustion capacity, it is possible to supply the air volume corresponding to the reduced combustion capacity. If not.

Therefore, the present invention solves the above-mentioned conventional problems, and provides a combustion device capable of appropriately monitoring and detecting a state in which the ventilation resistance of the air in the device is high. The purpose is to do.

Furthermore, the present invention monitors the absence of wind in the outside world and monitors the relationship between the output of the air flow sensor and the fan rotation speed in the absence of wind. An object of the present invention is to provide a combustion device capable of detecting an engagement, monitoring whether the relationship is normal or not, and detecting an abnormality of the equipment.

Further, according to the present invention, when the relationship between the air volume and the combustion fan deviates from the normal state by a first range or more, the input down operation for reducing the combustion capacity is performed. dISCLOSURE one when shifted range by Ri size has a second range above the twin-Ru ₀ invention as providing combustion device that can have a this to stop the row have combustion operation decisions to be life The basic principle of the invention is that after confirming that the outside world is calm, the output value of the airflow sensor and the output value of the fan rotation speed detector are monitored, and the abnormal At the point of detection. Therefore, the first method of monitoring the airflow detected by the airflow sensor when the combustion fan is rotated at zero rotation or constant tilling, and the airflow detected by the airflow sensor is maintained at a constant value. There is a second method of monitoring the rotational speed detected by the fan rotational speed detector while the combustion fan is rotating. In either case, the principle is the same, and for convenience of the following description, instead of alternately describing the constitutions of the inventions by both methods, the first invention is a method for supplying a power to a burner and a burner. Combustion fan for air and exhaust and exhaust from the air supply passage to the burner In a combustion device provided with an airflow sensor for detecting an airflow flowing in an air flow path leading to an air passage, the airflow sensor detected at zero rotation or constant rotation of the combustion fan This is a combustion device having a control unit that detects a no-wind state when the variation of the detected air volume is within a predetermined allowable range.

According to another aspect of the first invention, a burner for supplying and exhausting air to and from the burner, a rotation speed detecting device for detecting a rotation speed of the combustion fan, In a combustion device having a flow rate sensor for detecting a flow rate flowing in an air flow path from an air supply path to an exhaust path to the burner, the detected flow rate of the flow rate sensor becomes a constant value. When the variation in the detected rotation speed of the rotation speed detection device detected when controlling the rotation of the combustion fan is within a predetermined allowable range, the control unit determines that the windless state is established. It is a combustion device.

According to the first aspect, it is possible to easily detect that there is no wind in the outside world.

A second invention is directed to a burner, a combustion fan for supplying and exhausting air to and from the burner, and an air volume for detecting an air volume flowing in an air circulation path from an air supply passage to the exhaust passage of the burner. In a combustion device equipped with a sensor and

The airflow judgment value which is a reference for judging abnormality or life when the combustion fan is rotated at a predetermined rotation speed is stored, and the combustion fan is rotated at zero rotation or constant rotation. The fluctuation of the airflow detected by the airflow sensor detected in the When it is inside, it detects no wind condition,

When the no-air condition is detected, if the detected airflow of the airflow sensor when the combustion fan is rotated at a predetermined speed is lower than the airflow determination value, control for detecting abnormality or life is performed. It is a combustion device having a part.

According to another aspect of the present invention, there is provided a burner for supplying and exhausting air to and from the burner, a rotation speed detecting device for detecting the rotation speed of the combustion fan, A combustion device having an airflow sensor for detecting an airflow flowing in an air flow path from an air supply passage to an exhaust passage to the burner.

A rotation speed judgment value, which is a reference for judging abnormality or life when controlling the rotation of the combustion fan so that the detected air flow of the air flow sensor becomes a constant reference value, is stored.

Fluctuations in the rotation speed detected by the rotation speed detection device, which are detected when controlling the rotation of the combustion fan so that the air volume detected by the air volume sensor becomes an arbitrary constant value, are within a predetermined allowable range. At some point, it detects a windless condition,

When the no-air condition is detected, the rotation speed detection device detects the rotation speed of the combustion fan when the rotation of the combustion fan is controlled such that the airflow detected by the airflow sensor becomes the constant reference value. This is a combustion device that has a control unit that detects an abnormality or life when it is higher than the judgment value.

According to the second aspect of the invention, it is possible to appropriately monitor the relationship between the air volume and the number of revolutions of the combustion fan when there is no wind, Appropriate abnormality or life can be detected.

Further, the third invention detects a burner, a combustion fan for supplying and exhausting air to and from the burner, and a flow rate of air flowing in an air circulation path from an air supply passage to the burner to an exhaust air passage. In combustion equipment equipped with an air flow sensor,

An airflow determination value serving as a reference for determining an abnormality or life when the combustion fan is rotated at a predetermined rotation speed is stored, and the combustion fan is rotated at the predetermined rotation speed. When the detected airflow of the airflow sensor detected at this time is within a predetermined allowable range and the airflow detected by the airflow sensor is lower than the airflow determination value, an abnormal condition is detected. It is a combustion device that has a control unit that detects the life.

According to another aspect of the present invention, a third aspect of the present invention provides a burner, a burner that performs solid air and exhaust to the burner, a rotation speed detection device that detects the rotation speed of the combustion fan, In a combustion device having a flow rate sensor for detecting a flow rate flowing in an air flow path from a lined air passage to an exhaust passage to the burner, the detected flow rate of the flow rate sensor is set to a constant reference value. A rotation speed judgment value serving as a reference for judging abnormality or life when controlling the rotation of the combustion fan is stored.

Fluctuations in the rotation speed detected by the rotation speed detection device, which are detected when the rotation speed of the combustion fan is controlled so that the air volume detected by the air volume sensor becomes the constant reference value, are within a predetermined allowable range. At some point, the rotation speed detected by the rotation speed detection device is This is a combustion device that has a control unit that detects abnormality or life when the rotation speed is higher than the judgment value.

According to the third aspect, it is possible to simultaneously detect that the outside world is in a windless state and that the relationship between the air volume and the fan rotation speed is out of an appropriate value. You.

In a fourth aspect based on the second or third aspect, the combustion device further includes a fuel control unit that supplies fuel required for supplying a required amount of heat to the parner. The fuel control unit forcibly reduces the amount of fuel supplied to the parner when the abnormality or the life is detected.

As a modified example of the fourth invention, the air volume determination value further includes a first air volume determination value and a second air volume determination value lower than the first air volume determination value. If the detected airflow of the airflow sensor is lower than the first airflow determination value when the abnormality or the life is detected, the fuel control unit forcibly supplies the fuel supplied to the burner. Reduce

When the detected air volume of the air volume sensor is lower than the second air volume determination value, the fuel control unit does not supply fuel to the burner.

This fourth invention is also directed to the second or third invention described above.

The combustion device further has a fuel control unit that supplies fuel required for supplying a required amount of heat to the parner, and when the abnormality or the life is detected, the fuel control unit performs the fuel control. The control unit is a combustion device characterized by forcibly reducing the amount of fuel supplied to the parner.

As a modified example of the fourth invention, the rotation speed determination value may further include a first rotation speed determination value and a second rotation speed determination value higher than the first rotation speed determination value. When the abnormality or the life is detected, and the detected rotation speed of the rotation speed detection device is higher than the first rotation speed determination value, the fuel control unit is configured to perform Forcibly reduce the amount of fuel supplied to the parner,

When the rotation speed detected by the rotation speed detection device is higher than the second rotation speed determination value, the fuel control unit does not supply fuel to the burner. o

According to the fourth aspect of the invention, even if the relationship between the air volume and the fan speed is out of the proper value, the fuel is forcibly reduced to avoid incomplete combustion and to perform the combustion operation. O

According to a fifth aspect of the present invention, there is provided a burner for supplying and exhausting air to and from the burner, and an airflow sensor for detecting an airflow flowing in an air flow path from a lined air passage to the exhaust passage to the burner. In a combustion device equipped with

When the variation of the airflow detected by the airflow sensor, which is detected based on zero or constant rotation of the combustion fan, is within a predetermined allowable range, a no-air condition is detected. Detection of the air flow sensor when the combustion fan is rotated at a predetermined speed Memorize the air flow as the initial value,

After the predetermined time has elapsed from the storage of the initial value, when the above-mentioned no-air condition is detected, and the detected air volume of the air volume sensor when the combustion fan is rotated at the predetermined rotation speed, In addition, the present invention provides a combustion device having a control unit that detects deterioration of ventilation when the initial value is not less than a determination reference value.

According to another aspect of the fifth invention, a burner for supplying and exhausting air to and from the burner, a rotation speed detecting device for detecting a rotation speed of the combustion fan, And a flow rate sensor for detecting a flow rate of air flowing in an air flow path from an air supply passage to an exhaust passage to the burner so that the flow rate detected by the flow rate sensor becomes a constant reference value. When a change in the detected rotation speed of the rotation speed detection device detected when controlling the rotation of the combustion fan is within a predetermined allowable range, a windless state is detected, and the rotation speed detection device at that time is detected. The detection speed is stored as the initial value,

When the windless state is detected after a predetermined period of time after storing the initial value, the detected rotation speed of the rotation speed detecting device at that time fluctuates by more than the determination reference value from the initial value. This is a combustion device that has a control unit that detects deterioration of ventilation when it has been in use.

According to the fifth aspect of the present invention, the initial value of the airflow sensor is stored after the combustion equipment is installed, so that the sensitivity of the airflow sensor differs for each combustion equipment and for each installation environment. Adjust can do.

A sixth invention provides a burner, a combustion fan for supplying and exhausting air to and from the burner, and an air flow sensor for detecting an airflow flowing in an air flow path from a lined air passage to the exhaust passage to the burner. In a combustion device provided with a sensor, when a change in the airflow detected by the airflow sensor, which is detected based on zero rotation of the combustion fan, is within a predetermined allowable range, a no-air condition is detected. A combustion device having a control unit that stores the detected airflow of the airflow sensor when the no-air condition is detected as a zero point.

According to the sixth aspect of the invention, since the zero correction according to the aging of the airflow sensor can be performed without being affected by the wind of the outside world, combustion control and abnormalities can be performed using the airflow sensor. Or, the life can be properly judged.

According to a seventh aspect of the present invention, there is provided a burner for supplying and exhausting air to and from the burner, and an air flow rate for detecting an air volume flowing in an air flow path from an air supply passage to an exhaust passage of the burner. In a combustion device equipped with a sensor and

An airflow judgment value serving as a reference for judging abnormality or life when the combustion fan is rotated at a predetermined rotation speed is stored, and the combustion fan is rotated at the predetermined rotation speed. When the detected air volume of the air volume sensor detected when the air volume sensor is detected is lower than the air volume determination value within a predetermined period of time, a combustion unit having a control unit that detects an abnormality or a life is provided. Equipment.

According to another aspect of the present invention, there is provided a burner for supplying and exhausting air to and from the burner and the combustion fan. In a combustion device comprising a rotation speed detection device for detecting the rotation speed of the burner, and a flow rate sensor for detecting a flow rate in an air flow path from an air supply passage to an exhaust passage to the burner, the air flow sensor is provided. The rotation speed judgment value, which serves as a reference for judging an abnormality or life when controlling the rotation of the combustion fan so that the detected air volume of the combustion fan becomes a constant reference value, is stored.

The rotation speed detected by the rotation speed detection device, which is detected when the rotation speed of the combustion fan is controlled so that the air volume detected by the air volume sensor becomes the constant reference value, is continuously maintained within a predetermined time. This is a combustion device that has a control unit that performs abnormality or life detection when the rotation speed is higher than the judgment value.

According to the seventh aspect, by simply determining whether or not there is a windless state, it is possible to simultaneously detect the windless state and detect an abnormality or life. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of a main part of a first embodiment of a combustion apparatus according to the present invention.

FIG. 2 is a block diagram of an operation circuit for reducing the combustion capacity according to the first embodiment.

FIG. 3 is an explanatory diagram of the water heater having the life determining function of the first embodiment.

Figure 4 shows the detection of the wind speed and the air volume inside the equipment under the environment where the equipment is installed. FIG. 4 is an explanatory diagram showing the relationship between the fluctuation states of the differential pressure sensor output.

FIG. 5 is an explanatory diagram of a three-stage combustion control characteristic straight line of the water heater and a combustion control characteristic straight line when the capacity is down.

FIG. 6 is a flowchart of the first operation of the first embodiment.

FIG. 7 is a flowchart of a first operation of the first embodiment.

FIG. 8 is a flowchart of the second operation of the first embodiment.

FIG. 9 is a flowchart of the third operation of the first embodiment.

FIG. 10 is a flowchart of the third operation of the first embodiment.

FIG. 11 is a flowchart of a fourth operation of the first embodiment.

Fig. 12 is a graph showing the relationship between the combustion capacity of the water heater and the gas supply.

Fig. 13 is a graph showing the relationship between the air volume of the water heater and the combustion capacity.

Fig. 14 is a graph showing the relationship between the detected differential pressure of the differential pressure sensor that detects the air volume and the air volume.

Fig. 15 is an explanatory diagram of a common water heater as a combustion device. Fig. 16 shows the relationship between the target output value of the air flow sensor and the fan speed. This is a graph showing the relationship.

FIG. 17 is a block diagram of a main part configuration of a second embodiment of the combustion equipment according to the present invention.

Fig. 18 shows the input down data (first rotation speed judgment value) and the life judgment data (second rotation speed) used in the operation in the life diagnosis mode of the second embodiment. FIG. 4 is an explanatory diagram showing a relationship with a number judgment value.

FIG. 19 is an explanatory diagram showing the relationship between the sensor output target value and the fan rotation speed average value obtained at each sensor output target value in the second embodiment.

FIG. 20 is a flowchart showing the operation of the combustion apparatus according to the second embodiment.

FIG. 21 is a flowchart showing the operation of the combustion equipment according to the second embodiment.

FIG. 22 is a block diagram of a main configuration of a third embodiment of the combustion equipment according to the present invention.

FIG. 23 is a flowchart showing the operation of the third embodiment. FIG. 24 is a flowchart showing the operation of the third embodiment.

Fig. 25 is a graph for determining the judgment ratio, which is the standard for judging the magnitude of the fluctuation with respect to the initial value of the inspection data taken at regular intervals. FIG.

FIG. 26 is a flowchart showing the operation of the fourth embodiment. FIG. 27 is a diagram for describing a first operation of the first embodiment.

FIG. 28 is a diagram for explaining a first operation of the first embodiment. BEST MODE FOR CARRYING OUT THE INVENTION First, second, third, and fourth embodiments of the present invention will be described below with reference to the drawings. In the description of the embodiments, the same reference numerals are given to the same names as those in the conventional example, and the duplicate description thereof will be omitted.

In the following embodiments, the air volume detected from the air volume sensor 16 is simply referred to as a detected air volume value or an output of the air volume sensor. Depending on the type of airflow sensor used, its direct output may be a voltage value or another physical quantity. Regardless of the physical quantity, it is clear that the detected airflow value of the airflow sensor or simply the output of the airflow sensor means the detected airflow.

Further, the output of the combustion fan rotation speed detector or the rotation speed detection value also means the detected rotation speed irrespective of the physical quantity of the direct output.

[First embodiment]

FIG. 3 shows a combustion apparatus provided with an abnormality or life determining means according to the present invention, taking a water heater as an example. This implementation The example water heater has a burner 2 of the capacity switching type. By dividing the combustion surface of Parner 2 into three surfaces, A-side, B-side and C-side, and opening only the capacity switching valve 18a formed by a solenoid valve, etc. Opening of the capacity switching valves 18a and 18b results in a two-stage combustion state of the A and B sides, and the capacity switching valves 18a, 18b, and 18c. By opening the opening, the entire surface A, B and C are in a state of combustion. The combustion switching performance of the burner 17 can be switched by the valve switching operation of the capacity switching valves 18a, 18b, 18c. The control unit 15 controls the combustion switching of the burner 2, that is, the switching of the capacity switching valves 18 a, 18 b, and 18 c. Further, in the present embodiment, the differential pressure between the upper and lower sides of the burner 2 is detected by the differential pressure sensor 16 as an air volume detection sensor. Further, the rotation speed of the combustion fan 3 is detected by a fan rotation detection sensor 28 such as a Hall IC.

This embodiment is characterized by controlling the air flow of the combustion fan 3 based on the detection value of the differential pressure sensor 16 which is an air flow sensor, and also detecting an abnormality in the lined hot water heater. Means for performing the life determination is provided in the control unit 15.

It should be noted that the differential pressure sensor 16 used in the embodiment is substantially an air flow detection sensor, and will be described below as an air flow detection sensor for convenience of explanation.

As shown in FIG. 1, the characteristic abnormality or life determining means includes a condition determining unit 22, a memory 23, and a combustion stopping unit 24. And a fan restart unit 25, an abnormality or lifetime judgment unit 26, and an evening image 27. These are realized in the control unit 15.

The memory 23 stores a flow rate determination value serving as a criterion for determining whether a water heater is abnormal or has a life with respect to a set fan speed, which is a preset control condition. In addition, data such as the allowable setting range of the variation in the airflow detection sensor output when the fan rotation is zero rotation and when the fan rotation is given constant rotation is also stored. Although the set rotation speed of the fan is determined as appropriate, in the present embodiment, the rated maximum rotation speed of the combustion fan 3 is set, and the airflow judgment value at the rated maximum rotation speed is determined. It is stored in memory 23.

The situation determination unit 22 determines whether the combustion fan 3 is rotating at zero speed, that is, when the combustion fan 3 is not rotating, in a non-wind stable state and a windy state of the appliance installation environment. Do Figure 4 shows the relationship between the magnitude of the wind speed and the sensor output of the airflow sensor 16 when the water heater was exposed to a windy environment with the combustion fan 3 stopped. This is the graph I sought. As can be seen from this graph, in a windy condition, the detected airflow of the airflow sensor fluctuates asymmetrically with respect to the zero point of the sensor, and the fluctuation of this fluctuation The width increases as the wind speed increases.

The condition determination unit 22 stores, in the memory 23, the detected value of the air flow of the air flow sensor 16 when the combustion fan 3 is rotating at zero speed or the fluctuation range of the air flow. Compare with the setting allowable range. This setting allowable range is set to determine whether there is a wind state or no wind state depending on whether the fluctuation range of the air flow detection value is equal to or more than a predetermined value or less. For example, it is determined whether there is a wind condition or no wind condition based on whether the fluctuation range of the air flow detection value exceeds or does not exceed a predetermined allowable value. It is also possible to easily determine whether there is a wind condition or no wind condition by determining whether the detected air volume exceeds a predetermined absolute value.

In addition, when the fan rotation detection value from the fan rotation detection sensor 28 has reached a preset constant rotation speed in a non-combustion state, the situation determination unit 22 performs an evening image. 27 is operated for a predetermined time, and during the timer operation time, the detected air flow value added from the air flow sensor 16 is compared with the air flow judgment value stored in the memory 23. If the airflow detection value is out of the set allowable range, it is determined that there is wind. Further, when the current value is within the set allowable range, it is determined that the wind is stable, and the result is added to the combustion stopping unit 24 and the abnormality or life determining unit 26.

When the combustion fan 3 is rotating at the rated maximum number of revolutions and the combustion operation is being performed, the combustion stop unit 24 outputs a result that the detected air flow is smaller than the air flow determination value from the status determination unit 22. When it is received, the combustion of the burner 2 is stopped, and a signal of the combustion stop is applied to the fan restarting unit 25. The fan restart unit 25, when receiving a combustion stop signal from the combustion stop unit 24, does not burn the burner 2 but drives the combustion fan 3 to the set rotation speed, that is, the combustion. The motor starts rotating at the rated maximum number of rotations of fan 3, and this fan restart signal is applied to the abnormality or life determination section 26. After receiving the fan restart signal from the fan restart unit 25, the abnormal state or life determination unit 26 is in the state of stable windless state by the judgment of the state judgment unit 22. In addition, when the combustion fan 3 is rotating at the rated maximum speed and the detected air flow value is equal to or less than the air flow judgment value, it is determined that the water heater is abnormal or the service life has expired. Outputs a life signal. On the other hand, when it is determined that there is a wind condition, or when the detected airflow value exceeds the airflow determination value even in a stable windless condition, the water heater is abnormal or abnormal. Judged that the life is not reached and no error or life signal is output.

Fig. 2 shows the circuit of the operation control unit of the water heater when an abnormality or life signal is output from the abnormality or life judgment unit 26. This circuit includes a combustion capacity down switching unit 31, a performance characteristic graph selection unit 32, a fan control unit 34, and a water amount control unit 33.

When the abnormality or life signal is output from the abnormality or life determination unit 26, the water heater having the abnormality or life can be disposed of. However, the circuit shown in Fig. 2 does not immediately discard the abnormal or long-life water heater when an abnormal or long-life signal is output. This is a circuit that can be used temporarily until installation is performed. In the figure, the combustion capacity down-switching unit 31 can lower the combustion capacity of the water heater by one rank and output it from the combustion fan 3 when an abnormal or life signal is added. Attempt to avoid incomplete combustion of Pana 2 by air flow It is. The combustion capacity down switching unit 31 is provided with a water heater of No. 24 (output 36,000 K ca 1 / h) when an abnormality or a life signal is added, for example, 20 units. For example, by switching down to the combustion capacity of the output signal (output 30, OOOK cal Zh), the down-converted combustion capacity is added to the performance characteristic graph selection section 32 and the water flow control section 33. . To reduce combustion capacity, reduce fuel to Pana 2 o

The performance characteristic graph selection unit 32 is provided with, for example, control characteristic data of each combustion performance of three-stage combustion as shown in (a) of FIG. The characteristic line is a characteristic line of the combustion surface A of the parner 2 at the time of the first stage combustion, the characteristic line D ₂ is a characteristic line of the A surface and the B surface of the parner 2 at the time of the second stage combustion, and D ₃ is This is the characteristic line for the three-stage combustion on the surfaces B, B and C. Overlapping margins AD and AD 'are given between the characteristic straight lines of the respective stages, so that the conversion between the characteristic straight lines D2 and D3 can be performed smoothly.

For example, in the first stage combustion condition, the starting end position D _s of the characteristic line is minimal capacity position. When the combustion capacity gradually increases and reaches the maximum combustion capacity of the first stage combustion, the end position _DF of the characteristic line D, is reached. If a larger combustion capacity is required, the two-stage combustion on the A and B planes is performed by switching the capacity of the parner 2, and the combustion characteristic straight line is D, DF. point or al characteristic line D ₂ of the transfer Ri Kawa Ri to D p point, the combustion control is performed in accordance with the characteristic straight line D _2. Also, the straight line of the D ₂ According to come to be performed combustion control, the can and was Switching Operation place et ability Switching Operation recombination is performed by two-stage combustion or al 1 stage combustion PANA 2, characteristic line is the straight line D ₂ D. of the starting end position D _s or et al straight line Then, the combustion control is performed according to the characteristic line of D ,. As described above, when the performance of each stage is switched, the combustion control line is also switched. However, by providing the overlap margins AD and D ', the c is reduced. The switching between the characteristic lines can be performed smoothly without causing ching.

However, since the combustion capacity down switching unit 31 can switch the combustion capacity in the down direction, the combustion supply amount (proportional valve) on the right side of the line L in FIG. The current) portion is discarded. If it their respective characteristic line D,, D _2, between D heavy Do Ri white △ D, delta D 'Gana rather Do I then have until the switching Rikae combustion characteristic line is Do smoothly performed The problem is that it's gone. In order to solve this problem, the performance characteristic graph selection unit 32 determines that the required combustion performance is reduced when the combustion performance down switching unit 31 receives the combustion performance down switching. When it is between the characteristic lines D,, D ₂ , and D, select the characteristic line with the smaller combustion capacity (for example, in Fig. 5 (b), the required combustion capacity P is D, and D ₍ D1 is selected between ₂ ), and combustion control is performed according to the selected characteristic line.

On the other hand, the water volume control unit 33 receives the signal for switching the combustion capacity down from the combustion capacity down switching unit 31. Then, the set temperature set by the remote control etc. is compared with the tapping temperature detected by tapping temperature sensor 10, and if the tapping temperature detected by tapping temperature sensor is lower than the set temperature. In this case, the water amount control valve 11 is controlled to be throttled, and the water amount control valve 11 is throttled in a direction to discharge hot water at a set temperature. In other words, since the combustion capacity is reduced, the amount of hot water is reduced, and the set temperature is maintained.

[First action flow]

Next, the first operation of the present embodiment will be described based on the flowcharts of FIGS. The outline of the first operation flow is as follows. That is, if it is detected that the detected value of the air volume of the air volume sensor has decreased during the combustion, the combustion is temporarily stopped and the diagnostic operation is performed. In the diagnostic operation, the fan is restarted, and if the air volume during a constant rotation is within a predetermined range for a predetermined time, it is recognized as a no-air condition, and whether the air volume at that time is lower than the air volume judgment value is determined. Is checked. If it is low, the subsequent combustion is continued in the combustion capacity down mode, and if it is detected that the detected value of the air volume of the air volume sensor has decreased, the same diagnosis is performed again. If the result of the diagnosis indicates that the air volume is lower than the air volume judgment value again, it is determined that the life has expired and combustion is prohibited.

First, in step 101, zero is given as an initial value to the abnormality or life determination flag (LIFE). The operation from the next step 102 to 120 is a normal combustion operation control operation, so that the description will be simplified. In step 102, Incoming water is confirmed by the signal of sensor 7. Then, in step 104, the feedforward amount (FF amount) of the amount of heat required to raise the incoming water temperature to the set temperature is calculated, and the capacity switching valves 18a to 18c are calculated. ON / OFF determination, determination of the opening / closing amount of the proportional valve and energization of the proportional valve current corresponding to the opening amount, rotation of the combustion fan at the pre-purging speed, and ON of the solenoid valve 13 Action is taken.

At step 105, it is determined whether or not it is within the pre-purging time. When the purge time elapses, the combustion fan is increased to the ignition tri-speed, and the capacity switching valve is turned on and the ignition is turned on. . After confirming the ignition by the frame rod electrode (not shown) in step 107, the ignition is turned off in step 112.

If ignition is not confirmed in step 107, it is determined in step 108 whether the ignition trie time has elapsed, and if it is within the ignition trie time, Repeat the ignition. If ignition is not confirmed even after repeated ignition, in step 109, the solenoid valve, capacity switching valve, and proportional valve are each turned off. Then, it is determined that the hot-water tap (not shown) at the end of the hot-water supply pipe 8 is closed, and the flow rate sensor 7 no longer detects flowing water. Stop the combustion fan with and wait for the hot water tap to be opened again.

In step 107, ignition is confirmed, and in step 112, ignition is turned off. Then, in step 113, it is determined whether the abnormality or the life determination flag is zero. . At this point, since the abnormality or life judgment flag is set to zero in step 101, the flow advances to step 114, and the feedforward (FF) and the feedforward are set. Combustion operation is performed by both gas control of the FB (FB) and water control by the water control valve.

In step 115, it is determined whether or not the air volume matches the burner combustion amount during this combustion operation. Generally, there is a relationship of Ι = ΚΔΡ between the valve opening amount of the proportional valve 14, that is, the valve opening drive current I and the air flow. Here, Δ であ is the differential pressure between the upper and lower air passage sections of the parner 2 and corresponds to the air volume. Κ is a proportionality constant, and the value of Κ is set in advance. If the relationship between the valve-opening drive current I and the air volume satisfies the above equation, the combustion operation is continued in the fan control state as it is because the combustion volume and the air volume match. In other words, it is an ideal combustion approaching complete combustion, and emits little carbon monoxide, hydrocarbons, and nitrogen oxides. If the above expression is not satisfied, in step 117, the magnitude of the valve opening drive current I and 風 Δ の of the air volume information is determined. When I is smaller than ΚΔΡ, it corresponds to the valve opening of the proportional valve 14, that is, when the air volume is too large compared to the gas supply volume. In this case, step 118 To control the number of revolutions of the combustion fan 3 to decrease.

On the other hand, if the valve opening drive current I is larger than ΚΔΡ, it is determined in step 119 whether the fan rotation speed is equal to or higher than the rated maximum rotation speed. If the fan speed does not reach the rated maximum speed (upper limit), the fan speed should be increased. Since there is room, the fan speed is increased in step 120 to compensate for the lack of air volume. When the fan rotation speed is higher than the upper limit, it corresponds to the case of insufficient air volume (insufficient air volume). In this case, the insufficient air volume occurs due to the abnormality or the life of the equipment. Move on to the confirmation operation of whether it is due to wind or the influence of the wind in the equipment installation environment.

First, it is determined whether or not the abnormality or life determination flag is zero in step 121 in FIG. 7. At this stage, as described above, the flag is determined in step 101. Since zero is given, the operation proceeds to the operation of step 122, and the burner combustion is stopped by turning off the solenoid valve 13, the capacity switching valves 18a to 18c, and the proportional valve 14 respectively. Then, in Step 123, the combustion fan 3 is set under the control conditions, in this example, the motor rotates at the rated maximum speed, and in Steps 12 and 4, the airflow detection value ΔΡ of the airflow sensor 16 and In step 125, the airflow detection value is compared with the airflow determination value, and the airflow detection value is sampled until the operation time of the timer 27 elapses in step 125, and the airflow determination value is compared with the airflow determination value. Is repeated.

If the detected airflow values ΔP are all below the airflow determination value during the timer operation time, the status determination unit 22 determines that the airflow is stable. Despite such a stable windless condition, the lack of air volume occurred due to poor ventilation due to soot clogging in the hot water supply heat exchanger 4. Is determined to have occurred, and in step 126, the appliance is judged to be abnormal or the service life is judged to be abnormal by the life judgment unit 26, or the life is judged by the life judgment unit 26. 1 is set. Against this If the airflow detection value ΔP exceeds the airflow judgment value even at least once during the timer operation time (C minutes) described above, the airflow detection value is set in step 117 above. The reason that ΔP exceeded the airflow judgment value IZK to the low pressure side is not due to the abnormality or the life of the appliance, but is temporarily due to the effect of the wind, such as the back wind hitting the exhaust side of the water heater. It is determined that the airflow detection value has dropped. In the operations of these steps 123 to 125, the determination as to whether or not there is a stable windless state and the determination of the appliance abnormality or the life are simultaneously performed. The above-mentioned airflow determination value is, for example, a limit value at which, if incomplete combustion proceeds and the airflow becomes lower, the airflow of carbon monoxide, hydrocarbons, nitrogen oxides, etc. in the exhaust gas becomes higher. Can be determined.

Step 124 above will be further described with reference to FIG. Figure 27 shows an example of the change in airflow when the fan is rotated at a constant rotation with the passage of time on the horizontal axis. If the airflow detection value is higher than the airflow judgment value BmmAq, the airflow is normal, but the airflow judgment value fluctuates as shown in the figure due to the influence of the external wind. I have.

In addition, C shows an example in which the shadow of the wind is coming from the outside world for 1 minute. If a strong wind blows into the exhaust port from the outside world, the detected airflow value will temporarily decrease. However, in the natural world, certain strong winds do not change direction and do not blow continuously. Therefore, the strength of the wind blown from the outside fluctuates, and as shown in C1 in Fig. 27, the airflow value partially exceeds BmmAq. Follow As a result, a phenomenon occurs in which the airflow detection value ΔΡ exceeds the judgment value BmmAq. In this case, it is determined that there is a wind.

On the other hand, there is shown an example in which, after a further lapse of time, there is no external wind for 2 minutes in C, and the airflow value is lower than BmmAq. In this case, since there is no outside wind and there is little fluctuation in the airflow value, it is detected in step 124 that there is no wind but the airflow value is lower than the airflow judgment value. To

As described above, in this example, by monitoring whether or not the airflow value is kept lower than the airflow determination value B for a certain period of time, windy or windless Can be determined at the same time as whether it is abnormal or the service life has expired.

Figure 28 shows the change in the number of revolutions of the combustion fan when the combustion fan was controlled so that the airflow detected by the airflow sensor was constant. In this case, contrary to the above, whether the rotation speed from the rotation speed detector of the fan continuously becomes higher than the rotation speed determination value B for a certain period of time. By monitoring the wind, it is possible to judge whether there is wind or no wind and also to judge whether it is abnormal or long-lived.

Returning to FIG. 7, it is determined in step 1226 that the appliance is abnormal or has reached the end of its life, and if an abnormal or end of life signal has been output, the abnormality or end of life signal is output. To indicate that the equipment is abnormal or has reached the end of its service life, or to indicate on the display of a remote control, etc. . This encourages the user to take appropriate measures, such as replacement of equipment and maintenance.

Abnormality or life judgment is performed from the above steps 122 to 126, and if it is judged that abnormality or life is not reached, the abnormality or life judgment flag remains at zero. If it is determined that the battery is abnormal or has reached the end of its service life, 1 is given to the abnormality or service life determination flag.

In either case, the operation of steps 102-113 is performed by opening the hot water tap next time. Then, when it is confirmed in step 11 that the abnormality or life judgment flag is set to 1, it is determined that the equipment is abnormal or the life is expired. Judgment is made as the state of the later combustion operation, and the operation after step 127 in FIG.

The operation after step 127 shows the operation of temporarily making the water heater usable within the range of the air volume reduced due to the appliance abnormality or the service life. In step 127, the combustion capacity of the water heater is reduced to a predetermined amount, for example, 1 N for each stage of combustion of the burner 2. This N is a real number including a small number. That is, the ability on the right side of the line is cut, as shown in FIG. 5 (a). Next, in step 128, it is determined whether or not the combustion capacity required by the feedforward calculation can be obtained for the set temperature (feedforward gas amount control). Is possible or not?). If this combustion capacity can be obtained, the combustion operation after step 115 is performed in the cut state of the combustion capacity. In this case, Step 1 1 6 When the water flow is determined to be ON (while combustion is continuing), the operation in step 113 is not performed, and the combustion capacity is reduced to 1 N as indicated by the broken line. In response, the operation proceeds to the operation of step 114.

On the other hand, in step 128, it may be determined that the combustion capacity of the feedforward operation amount cannot be obtained. That is, as shown in (a) and (b) of FIG. 5, the right side of the line L is cut and overlapped between the characteristic straight lines of each stage ΔD, ΔD ′ In this case, the combustion performance at the gap between the characteristic straight line on the low capacity side and the higher characteristic straight line is required. In this case, in step 129, the combustion control is performed by shifting the combustion control characteristic line to the lower characteristic line. Then, in order to compensate for the drop in hot water temperature due to the selection of the characteristic line on the low capacity side, the water amount control valve 11 is controlled in the closing direction in the next step 130. Then, the amount of hot water is controlled to decrease, and the amount of hot water at the set temperature is controlled so that the hot water can be discharged. Then, the combustion operation is performed after step 1 15. Also in this case, when the water flow is determined to be ON in step 116, the operation does not proceed to step 113 but moves to the operation of step 114.

As described above, after “1” is set to the abnormality or life determination flag, the air volume control is performed from step 115 to step 120. At this time, if the fan rotation speed is equal to or higher than the rated maximum rotation speed in step 119, the abnormality or life judgment flag is zero in step 122. Whether or not Refused. In this case, 1 has already been set in the abnormality or life judgment flag, and the operation of the appliance is forcibly stopped in step 13 1. Then, the combustion operation cannot be performed after that, preventing the combustion operation from being performed while the combustion is poor, thereby achieving safety.

[Second action flow]

FIG. 8 is a flowchart showing a second operation for judging the abnormality or the life of the appliance. The outline of the flow of the second operation is as follows. That is, if an abnormality is detected in the air volume during the combustion, the combustion is temporarily stopped. Then, in the diagnosis operation, based on the non-combustion and zero rotation of the fan, a determination of a no-wind state is made, and when there is no wind, it is determined whether or not a sufficient amount of air is obtained by rotating the fan a predetermined number of times. A determination is made.

In the first operation shown in FIGS. 6 and 7, the operation of discriminating between a windy condition and a stable condition with no wind, the operation of judging abnormality or life, and the combustion operation are performed in step 122. After stopping, the operations were performed simultaneously by the operations of steps 123 to 125. However, in the second operation, the determination of the stable state of wind and no wind and the determination of the abnormality or life determination are performed by separate operations. Therefore, the determination of stable conditions with and without wind can be made more accurately. In this regard, the second behavior is more favorable. The other operation is the same as the first operation, and the same operation is denoted by the same step number. The operation from step 101 to 121 and the operation from step 127 to 131 are the same as the first operation. Therefore, FIG. 8 illustrates the operations of step 101, step 102, step 121, and step 131, and omits the common step operation between the first operation and the first operation. .

In the flowchart of FIG. 8, the operation from step 132 to step 139 shows the operation of discriminating between the windy state and the stable windless state of the equipment installation environment. The operations from step 140 to step 142 indicate the operation of determining the abnormality or the life of the appliance. During the combustion operation of the appliance, the detected air volume is insufficient compared to the gas supply despite the fact that the rotation of the combustion fan is higher than the rated maximum speed in step 119. It is determined that it is. In that case, step 132 is used to determine if the air shortage is due to wind or due to equipment malfunction or longevity. Stop combustion with. When the combustion is stopped, the solenoid valve, the performance switching valve, and the proportional valve are turned off, and the combustion fan 3 is also stopped. Then, the operation proceeds to steps 133 to 139 for judging whether there is a windy state or a stable state of no wind.

If there is a wind of a certain speed or higher in the outside world, the output of the airflow sensor 16 will be greatly affected by the influence. This point is as explained in FIG. Therefore, in the following operation, the variation of the output of the air flow sensor 16 in the non-combustion state at zero rotation of the combustion fan is monitored.

Also not a, in stearyl-up 133, Kazeryouse capacitors 16 maximum instantaneous value Δ P Μ Λ Χ and minimum instantaneous value _Δ Ρ Μ of, and _Ν is input as the initial value data This input value is stored in the memory 23 or the like. As the initial value, for example, the value of the sensor zero point in FIG.

, ΔPΜ, Ν. In step 134, it is determined whether or not the detected _airflow value _ΔΡ detected by the airflow sensor 16 is greater than or _{equal to ΔΡΡ, and the} detected _airflow value _ΔΡ is set to the maximum instantaneous initial value ΔΡ. _If it is larger than _{ΜΑ 置き換える} , replace the detected value Ρ _Χ with Ρ Ρ _Χ . Also, in step 136, the air flow detection value ΔΡ is compared with the minimum instantaneous initial value ΔΡΡ, Ν, and it is determined whether _{ΔΡ is} equal to or less than _ΔΡΡ1Ρ . Δ Ρ is Δ Ρ Μ, is to come even small-les-Ri good _Ν, and replace the Δ Ρ to Δ Ρ Μ _{1 Ν.} The maximum instantaneous value ΔPMAX and the minimum instantaneous value ΔP _M , N are replaced with each other for a predetermined sampling time specified by the operation of the imager 27, and _Determine Ρ _{ΜΑ Χ} and Δ Ρ _{Μ Ι Ν} .

Next, determine the difference between the stearyl-up 139 the determined厶_Ρ ΜΑ Χ and _Δ Ρ Μ Ι Ν, the difference between this (variation fluctuation width) is equal to or below the value of the allowable setting range. When the difference between the maximum instantaneous value and the minimum instantaneous value is equal to or larger than the allowable setting range D, in other words, the wind speed that causes the variation in the airflow detection value of the airflow sensor 16 falls within the allowable setting range D. When the wind speed is higher than the corresponding wind speed, it is determined that there is a wind, and it is determined that the shortage of air volume is caused by the temporary wind, and the operation after step 102 I do .

On the other hand, if the difference between the maximum instantaneous value △ PMAX and the minimum instantaneous value ΔPM, N is smaller than D in step 139, it is determined that there is no wind and the next step is taken. From 140 to 141 Then, the operation proceeds to the operation for judging the equipment abnormality or the life. In step 140, the combustion fan 3 is rotated at the rated maximum speed, which is the set control condition, without the burner in the burner. In this state, the airflow detection value ΔP is compared with the airflow judgment value (BmmAq) at step 141, and when the airflow detection value ΔP is lower than the airflow judgment value. Is determined to be an appliance abnormality or life due to deterioration of the ventilation clogging, the abnormality or life determination flag is set to 1 and an abnormality or life signal is output, and the step in FIG. 7 is performed. By the operation after 127, the combustion capacity is reduced to 1 N and the combustion operation is temporarily enabled.

[Third action flow]

FIG. 9 and FIG. 10 are flowcharts showing a third operation of the present embodiment. In the third operation, after the operation switch is turned on and the power is turned on, before turning on the combustion fan, it is determined whether the wind is stable or not, and the combustion is started. During the fan rotation of the previous pre-purging, it is characterized by judging abnormality of equipment or life. In the flowchart showing the third operation, the same operation as the first operation or the second operation is denoted by the same step number, and the description thereof is omitted (or (Simplification).

First, when the operation switch is turned on, zero is set to the abnormality or life determination flag in step 101, and the maximum moment of the air flow sensor 16 is set in step 301. Value Δ PM _A X and minimum instantaneous value Δ P

The initial values of Μ and Ν are input, and at the same time, zero is set in the windless judgment flag Ε. Then, in step 302, the wind condition The timer 27 for judging the wind stability state is started (including the reset evening).

Next, in steps 134 to 137, the same operation as steps 134 to 137 in FIG. 8 showing the second operation is performed, and sampling is performed using the air flow detection value of the air flow sensor 16. _Determine the maximum instantaneous value Δ Ρ Ρ _Χ and the minimum instantaneous value Δ Ρ _{Ι Ν} _ン during the _swing time. Then, in step 303, it is confirmed that the flow sensor (water sensor 7) is off, and in step 304, the determined maximum instantaneous value Δ Ρ _{ΜΑ Χ} And the minimum instantaneous value Δ Ρ _Μ _{Ν 差} , and the allowable setting range D. When the fluctuation range between the maximum instantaneous value ΔPMAX and the minimum instantaneous value ΔPM, N falls below the allowable setting range D, it is judged that there is no wind stability and 1 is set in the windless judgment flag E. If the fluctuation range between the maximum instantaneous value Δ Ρ _{ΜΑ Χ} and the minimum instantaneous value Δ Ρ _,, Ν is larger than the set allowable range D, it is judged as a windy condition and the windless judgment flag Ε Should be left at zero.

The determination of the windy state and the stable state of the windless state is repeated until the ON signal is added from the water flow sensor 7 in step 307, and the water flow sensor 7 is turned ON. Go to step 10. When the ON signal is supplied from the water sensor 7, the combustion fan 3 is printed in the next step 104. One rotation (operation to rotate the combustion fan to exhaust the exhaust gas in the combustion chamber before burning the burner). At step 308 in FIG. 10 when the fan rotation of the prepurge is stabilized to a certain level, the detected airflow value Δ の of the airflow sensor 16 and its The air volume judgment value (B mm A q) at the constant speed of the prepurge is compared with. If the airflow detection value ΔP is lower than the airflow determination value, it is determined in step 309 whether or not 1 is set in the no-wind determination flag. When 1 is set in the windless judgment flag, it means that the airflow is insufficient under stable windless conditions. Therefore, in this case, it is determined that the equipment is abnormal or the service life due to the deterioration of the ventilation clogging is degraded.In step 310, 1 is set to the abnormal or life-determining flag, and the abnormal condition is set. Outputs the life signal. If the detected airflow value is larger than the airflow judgment value in step 308, the airflow is not in a state of insufficient airflow, and the no-airflow judgment flag is zero in step 309. In this case, it is determined that the lack of air volume is due to the presence of wind. Perform the combustion operation after 06.

In the operation after this step 106, when the abnormality or the life judgment flag is zero, the normal combustion operation is performed. Further, when 1 is set in the abnormality or life determination flag, this is determined in step 113, and the step of FIG. 7 showing the first operation is performed. The same operation as the operation from 127 to 130 is performed, and the combustion operation is performed by reducing the combustion capacity of the appliance.

In this third operation, before turning on the combustion fan 3, a judgment is made as to whether there is a breeze or no wind, and using the fan rotation of the prepurge before burning the burner 2 The abnormality or the life of the battery is judged, so that the fuel is burned as in the first and second operations. Compared to stopping the burning operation and then rotating the combustion fan to determine the abnormality or life, the abnormality or life can be determined quickly in a short time. The effect is obtained. Further, similarly to the second operation, since the determination of the condition of the presence or absence of the wind is performed while the combustion fan 3 is not rotating, the accuracy of the condition determination can be significantly improved.o

[Fourth action flow]

FIG. 11 is a flowchart showing a fourth operation of the present embodiment. The fourth operation is to stop the combustion operation when it is determined that there is insufficient airflow during combustion operation by burning the wrench and the rotation of the combustion fan cannot cope. Another feature is that while the combustion operation is continued, a judgment is made as to whether there is a wind or no wind and whether an abnormality or life of the appliance is determined. In the flowchart of the fourth operation, the same operations as those in the flowchart of the second operation shown in FIG. Is omitted or simplified.

In this fourth operation, when the operation switch is turned on, the abnormality or life determination flag is set to zero in step 401, and the air flow sensor 16 detects the air flow. The initial values of the maximum instantaneous value Δ Ρ _{Μ Α} and the minimum instantaneous value Δ Ρ ,, Ν are input and stored. Next, the combustion operation is started by the operation after step 102. The operation from step 102 to 121 is the same as the step operation of the same number in FIG. 8 of the second operation and FIGS. 6 and 7 of the first operation. is there. Insufficient air flow is determined for gas supply If so, it is determined in step 119 whether the rotation speed of the combustion fan 3 is higher or lower than the rated maximum rotation speed. Fan rotation is up. However, when the fan rotation speed is higher than the rated maximum rotation speed, the air flow is insufficient to prevent the air flow from being increased.In this case, the abnormality or service life in step 121 is exceeded. It is determined whether or not the determination flag is zero. When the abnormality or life determination flag is zero, the combustion operation is continued, and it is determined whether or not the wind is stable and whether the abnormality or life is determined. From step 134 to step 138, the maximum instantaneous value is obtained using the airflow detection value detected by the airflow sensor 16 during sampling by a predetermined timer operation. placing delta P _{MA X} and a minimum instantaneous value _Δ Ρ Μ Ι _Ν.

Then, in step 139, the difference between the maximum instantaneous value ΔPMAX and the minimum instantaneous value Δ Ρ _{Μ Ν Ν} is compared with D of the set allowable range. That is, when the combustion fan is rotating at a constant rotational speed, the amount of change in the detected airflow value of the airflow sensor 16 when the combustion fan is rotating is compared with D within the allowable setting range. If the variation of the airflow detection value falls below the set allowable range, it is determined to be a stable state with no wind; otherwise, it is determined to be a windy state.

If it is determined that the airflow is stable, the next step 141 compares the airflow detection value ΔΡ taken by the airflow sensor 16 with the airflow determination value BmmAq. Will be When the airflow detection value ΔP falls below the airflow judgment value, the airflow is stable. Despite this, it means that the air volume is insufficient, and it is judged as abnormal or life due to clogging and deterioration of the equipment. Then, in step 142, the abnormality or life judgment flag is set to 1 and an abnormality or life signal is output, and the operations in steps 127 to 130 in FIG. 7 are performed. The same operation as that described above is performed, and the combustion operation is continued in the prone state in which the combustion capacity of the appliance is reduced.

In the fourth operation, when it is determined that the air volume is insufficient while the air volume is not increased, the combustion operation is temporarily stopped as in the first and second operations. Instead of performing an abnormality or life determination, the abnormality or life of the appliance is determined while the combustion operation is continued. Therefore, there is no inconvenience that the hot water temporarily goes out during the use of the hot water, and it is possible to judge the abnormality or the service life of the appliance while using the hot water without any trouble. The excellent effect can be achieved. According to this embodiment, the abnormality or life of the appliance can be determined based on the detected air volume of the air volume sensor that performs the air volume control. Can accurately know the service life. As a result, even though the equipment is abnormal or has reached the end of its life, the use of the equipment is continued even after that, leading to deterioration of combustion such as excessive generation of CO gas, It is possible to prevent waste that the equipment is discarded because it is judged to be abnormal or the life of the equipment, even though the equipment still maintains a sufficiently good combustion performance. You.

In addition, it is possible to judge whether the device is abnormal or its life is stable under no wind conditions. This is performed without being affected by the effects of winds such as headwinds (fluctuations in airflow sensor output due to winds) in the environment in which the equipment is installed. The accuracy of the determination is improved, and the reliability of the abnormality or life determination can be significantly improved.

In the above embodiment, when the abnormality or the life is determined,

In the operation 1, a time of C minutes is given in step 1 25 of Fig. 7, and if the airflow detection value ΔP exceeds the airflow judgment value at least once within this time, an abnormality occurs. Or, it is determined that it is not the service life, and if the airflow detection value is less than the airflow determination value for all C minutes, it is determined that the appliance is abnormal or the service life has expired. As in the second to fourth operations, without giving time for C minutes, abnormality or life judgment is immediately performed based on the airflow detection value detected after it is judged that there is no wind stability. You may do it. Conversely, in the second to fourth operations, if the airflow detection value detected after the determination of the stable windless state falls below the airflow determination value, the operation is immediately performed. It was determined that the device was abnormal or the service life expired.However, as in the first operation, this was given a time of a predetermined C minute, and within this time the detected airflow value exceeded the airflow determination value even if it was even once. If it is determined that the life is not abnormal or that the service life has expired, and all air flow detection values (differential pressure detection values) fall below the air flow judgment values (differential pressure judgment values) for C minutes. Alternatively, it may be determined that the appliance is abnormal or has reached its end of life.

Further, according to the first embodiment, it is not necessary to separately provide a sensor for judging abnormality or life, and the air flow control Since the abnormality or the life can be determined by using the airflow detection sensor of the present invention, the device configuration of the combustion equipment having the abnormality or life determination function of the present invention can be simplified, and Accordingly, it is possible to reduce the cost of the apparatus.

In addition, according to the first embodiment, the burner is reduced by outputting an abnormality or life signal by the abnormality or life judgment unit by using a multi-stage switching type of the wrench. In the event that a missing part occurs in the control characteristic data overnight, a capability adjusting means is provided to forcibly specify the lower control characteristic data when the combustion performance of the missing part is required. With this configuration, even if the combustion performance of the missing portion is required, the characteristic data of the combustion control is always provided, and thereby, there is no problem. In addition, the combustion operation can be performed smoothly.

In the first embodiment, the detection airflow of the airflow sensor when the fan speed is kept constant is monitored. However, it is clear that it is technically possible to control the rotation of the fan so that the air volume becomes constant and monitor the rotation speed.

[Second embodiment]

Next, a second embodiment of the present invention will be described. First, the outline of the second embodiment is as follows. The feature of the second embodiment is to monitor the relationship between the air flow rate and the number of revolutions of the combustion fan. When the down operation is performed and the degree of abnormality in the relation is further large, it is determined that the combustion equipment is abnormal or the service life has expired, and then the operation is stopped. That is, the first judgment value and the second judgment value are If the fan rotation speed when maintaining the predetermined air volume exceeds the first judgment value, the fuel supplied to the burner is forcibly reduced and exceeds the second judgment value. At times, fuel supply is prohibited.

In the second embodiment, the abnormality or the life is judged by monitoring the number of revolutions of the combustion fan when the output of the air flow sensor is kept constant. In the first embodiment, the same judgment was made based on whether or not the output of the air flow sensor when the rotation speed of the combustion fan was kept constant was reduced. It is clear that these technically mean the same thing.

For the sake of simplicity, the term “abnormal or life” will be referred to simply as “life”.

In the second embodiment, during the combustion operation, the sensor output target value of the airflow detection sensor is determined according to the required combustion capacity that is demanded moment by moment, and the output of the airflow sensor is determined by this sensor. The rotation control of the combustion fan is performed to match the output target value.

During this combustion operation, when the fan rotation speed exceeds the limiter given in the upper part of the fan control characteristic data as shown in Fig. 16, However, it is estimated that a state of deterioration due to clogging of the ventilation has occurred, and thereafter, the combustion operation is stopped and the operation in the life diagnosis mode is performed.

In the operation of the lifting mode of this, each sensor for each output target value V _{S 1} ~ V _SN, the rotational speed is detected storage of one or more combustion fan being designated One by the target value specifying portion It is. When the detection and storage of the combustion fan rotation speed is performed, if the unit has a validity judgment unit for the detection and storage data, the variation in the detected and stored fan rotation speed data varies. The width is calculated. When this variation fluctuation range deviates from the predetermined fluctuation range, it is determined that the wind is blowing in the surrounding environment where the equipment is installed and that the data fluctuates. Then, the acquired detection and storage data is invalidated and deleted, and the detection and storage are performed again by retrieving the data. Detects and stores the rotation speed detection data of the combustion fan in a stable condition with no wind and no wind.

The life determining unit obtains an average value of the number of revolutions of the combustion fan monitored by the fan rotation monitoring unit for each sensor output target value, and obtains a fan output for each sensor output target value. Compare the average value of the fan speed with the input down data and the lifetime judgment data. Then, among the average values of the fan rotation speed of each sensor output target value, the data of L or more of the preset reference number is input down data and life judgment data. When the vehicle enters the region before the evening, a down command signal of the combustion capacity is output. Chi sales of fan rotational speed average value of each cell down output target value, and the can exceeds a lifetime judgment data set reference number of L ₂ or more given in advance, it is determined that the device lifetime life The signal is output.

The combustion capacity is controlled in a decreasing direction by outputting a down command signal of the combustion capacity from the life determining section. Even if the air volume decreases, it is good within the range of the reduced air volume. Perform combustion operation while maintaining combustion performance. On the other hand, when the life signal is output from the life judgment section, the combustion is locked, and the combustion operation is performed in a state of insufficient air flow to prevent the combustion operation from being performed. Prevention of danger due to the increase in generated amount.

Hereinafter, the second embodiment will be described in detail with reference to the drawings. The combustion device of the present embodiment is directed to a water heater similar to that shown in FIG. 3, and the same reference numerals are given to the same names, and the description thereof will not be repeated.

FIG. 17 shows a block configuration of the characteristic life determining means of this embodiment. The unique life determining means includes a combustion control unit 1017, a fan rotation control unit 1018, and a diagnostic mode operation unit 1021 that performs an operation in the appliance life diagnostic mode. ing. The configurations and operations of the combustion control unit 1017 and the fan rotation control unit 1018 are the same as those described above, and the description thereof will not be repeated.

The diagnostic mode operation unit 1021 includes a target value designation unit 1022, a fan rotation command unit 1023, a fan rotation monitoring unit 1024, a validity determination unit 1025, a combustion capacity down control unit 1026, and a life. It has a judgment section 1027 and an evening image 1031. The operation in the diagnostic mode operation unit 1021 is performed in a non-burning state of the parner 2. The diagnostic mode is that the fan rotation speed of the combustion fan 3 exceeds the upper limit of the fan control characteristic data shown in FIG. 16 during the combustion operation. It is carried out after the combustion is stopped by. This limit The evening value is a value obtained from the boundary point where the amount of carbon monoxide, hydrocarbons, nitrogen oxides, etc. in the exhaust gas increases due to incomplete combustion. The target value specifying unit 1022 specifies one or more sensor output target values of the air flow detection sensor 16 when performing the life diagnosis. When specifying the target value, the sensor output target value specified in the memory or the like may be input and stored in advance, or the target value may be specified by keyboard or keyboard. It is also possible to adopt a configuration in which input is specified externally by using a password, memory card, or the like. The sensor output target values V _S1 to V _SN specified by the target value specifying unit 1022 are added to the fan rotation coupling unit 23.

Fan rotation command unit 1023 adds the fan rotation controller 18 over collectively the specified sensor output target value V _{S 1} ~ V _SN or sequential predetermined time. For example, fan rotation Sashiawase 10 23 or racemate capacitors output target value V _{S 1} is Ri by the and this applied, fan rotation controller 1018 outputs cell down support of the air flow detection cell down support 16 The rotation control of the combustion fan 3 is performed so that the output target value Vs is obtained. Also, in against the cell down output target value V _{S 2} applied fan rotation command unit 1023 or al, air volume detection cell burning off § output of capacitors 16 in earthenware pots by that Do and V _{s 2} Control the rotation of pin 3. In this way, each sensor output value VS! Added from the fan rotation command unit 1023. And against the ~ V _{s N,} respectively I also for a predetermined time interval, the rotation control of the combustion fan 3 that was different from the sequentially down output target value is performed.

The fan rotation monitor 1024 for each sensor output target value V _{S 1} ~ V _SN, preparative fan rotation speed of the one or more combustion fan 3 Detected and stores it in memory. In the detection and storage of the fan rotation speed, the timer 1103 is used, and the fan rotation monitor unit 1024 detects the fan rotation speed R and T at intervals of T seconds. and stores it in the Note Li crowded Ri sequentially retrieve the ~ R _M. The validity judging unit 1025 detects and stores the number of detected fan rotations each time the fan rotation monitoring unit 1024 detects and stores the fan rotation speed of each sensor output target value. R, ~ Chi sales of R _M, the difference between the maximum value and the minimum value determined by the variation fluctuation range, the range of the set fluctuation width when calculated this variability fluctuation range is given Me pre Judge whether it is inside.

When the variation fluctuation range is within the set fluctuation range, the surrounding environment where the water heater is installed is in a calm state, and the detected and stored data is a reliable and effective data. Judgment that it is. Then, the fan rotation monitor unit 1024 is informed of the fact, and the process proceeds to the detection and storage of the fan rotation speed at the next sensor output target value. On the other hand, when the fluctuation range of the fan rotation speed deviates from the set fluctuation range, it is determined that the wind is unstable.

The validity judging unit 1025 determines whether the fluctuation range of the fan rotation speed data detected and stored by the fan rotation monitoring unit 1024 is out of the set fluctuation range. Instructs to repeat the detection and storage of erased data and the detection and storage of fan speed data again. When the fluctuation range of the fan rotation speed detection storage data falls within the set fluctuation range, the next sensor output command the detection and storage of the fan rotation speed of the target value, and Sensor output target value The fan speed data for each fan is detected and stored under stable windless conditions.

As described above, as can be seen from the graph in Fig. 4, when there is a windy condition, the detection value of the airflow detection sensor fluctuates vertically and asymmetrically with respect to the zero point of the sensor. The fluctuation width of the wind increases as the wind speed increases.

The validity judging unit 1025 compares the fluctuation range of the detection value of the airflow detection sensor 16 with the set fluctuation range, and sets the set fluctuation range (the set fluctuation range is given by the upper limit level and the lower limit level). However, depending on the case, it may be given only at the upper limit level. When it deviates from the upper limit level (when the setting fluctuation range is given only at the upper limit level) ) Is judged to be windy. If the fluctuation range of the detection value (sensor output value) of the air flow detection sensor 16 is within the set fluctuation range, it is determined that there is no wind stability. In other words, when the wind speed is lower than the reference wind speed corresponding to the set fluctuation range, it is determined that there is no wind stability, and the water heater is installed more than the reference wind speed. When the wind speed in the environment increases, it is determined that there is wind.

A lifetime as shown in FIG. 18 is given to the life determining unit 1027 in advance. In other words, the fan rotation speed becomes large relative to the same sensor output target value for the fan control characteristic data RI at the initial stage of installation of the water heater without deterioration due to ventilation clogging. The input down data RB is provided to the input side, and the same sensor output is supplied to this input down data. The life judgment data RC is given to the side where the fan rotation speed is higher than the force target value. This input down time overnight RB is the first judgment value, and the life judgment data RC is the second judgment value. Life determination unit 1027, FIG. 1-9如rather, each sensor output target value V _{S 1} ~ V _SN average value of the detected stored fan revolution speed detection storing data for each RA, the ~ RA _N The average value of the fan rotation speed of each sensor output target value obtained RA! The ~ RA _N is compared with the data shown in FIG 8.

Their to each sensor output target value V _{S 1} ~ V _SN of fan rotational speed average value RA, Chi sales of ~ RA _N, Lee emissions flop Tsu preparative Dow Nde evening RB La Lee emissions and life determination de Judgment is made as to whether or not the number of average values in the area between the RC line and the overnight is equal to or greater than a predetermined L, (L1 is an integer of 1 or more). If L or more, it is determined that the combustion state is such that the air volume is insufficient, and a down signal indicating the combustion capacity is added to the combustion control unit 1017.

The down amount of the combustion capacity may be given as a predetermined fixed amount, and the combustion capacity may be gradually reduced every time a down command of the combustion capacity is issued. Alternatively, according to the number of fan rotation speed average values in the area between the input down data RB and the life judgment data RC, the amount of combustion capacity down is proportionally reduced. The configuration may be such that it is reduced. Upon receiving the combustion capacity down command from the combustion capacity down control section 1026, the combustion control section 1017 reduces the valve-opening drive current applied to the proportional valve 14 by the combustion capacity down amount. To reduce gas supply to facility 2. Also, the life judgment unit 1027, each cell down output target value V s, ~ V _SN every fan rotational speed average value RA, Chi sales of ~ RA _N, life determination data (lifetime determination data If there are any exceeding the RC line), count the number. Their to, L ₂ (L ₂ is an integer of 1 or more) to come to have exceeded pieces of the set criteria number given in advance, the rotational speed is an upper limit Li Mi Tsu evening combustion fan 3 - Zhang Ri attached to The fan speed cannot be increased any further.Even though it is the maximum speed in the rotation control range, the airflow is insufficient due to clogging and deterioration, and the combustion performance is degraded. Judge and output the life signal. When this life signal is output, the solenoid valve 13 is forcibly shut off and held, the supply of fuel is prohibited, and the combustion stops in a locked state. Combustion operation is prevented.

If the average value of the fan rotation speed of each sensor output target value does not reach the input down data RB, the life determination unit 1027 If the average value data exceeds the number L, even if it exceeds the average RB, it is judged that the ventilation clogging has not deteriorated and it is appropriate (normal). The signal of is output.

The notification unit 1030 receives the signal of each determination result of the life determination unit 1027, and notifies the determination result differently. As this notification method, a character or symbol is displayed on the liquid crystal screen, or a distinction is displayed based on various modes such as lighting or blinking of a lamp, or the like. The judgment result is determined by the life judgment unit 1027 based on an appropriate specification such as sounding a buzzer. The judgment result is notified separately.

[Explanation of operation by flow chart]

The second embodiment is configured as described above. next

The operation of the life determination will be described based on the flowcharts of FIGS. 20 and 21. In FIG. 20, step 1101 indicates that the water heater is in the combustion operation. In this state, the combustion control unit 1017 applies a valve-opening drive current corresponding to the required amount of combustion heat to the proportional valve 14. On the other hand, in step 1102, the sensor output target value of the airflow detection sensor according to the required combustion heat is determined. In step 1103, the voltage applied to the combustion fan 3 is controlled so that the sensor output of the air flow detection sensor 16 matches the sensor output target value, and the rotation of the combustion fan 3 is controlled. Will be

Then, in step 1104, the fan rotation speed is detected. In step 1105, it is determined whether or not the detected fan rotation speed of the combustion fan 3 has reached the upper limit of the fan control characteristic data shown in FIG. 16. . If the fan speed has not reached the upper limiter, it is determined that the fan is in the normal airflow control state, and the combustion operation is continued as it is. . On the other hand, when the detected fan rotation speed exceeds the upper limiter, the combustion operation is stopped immediately in step 1106, and the life diagnosis mode shown in FIG. Move to the operation of.

In the operation of the life diagnosis mode, first, the sensor output target values V _S1 to V _SN are set in step ₁₂₁ of FIG. Then, in step 1202, the combustion fan 3 is started to rotate. Sensor output air volume detecting sensor 16 is fan rotation speed Cormorants by matching Initial sensor output target value V _s is controlled. Next, in step 1203, the timer 1031 is turned on from the reset state, and after waiting for time T to elapse, the fan rotation detection sensor 28 causes the combustion fan to be turned on. Detects the rotation speed of fan 3 and stores it in memory. The rotation speed detection and storage operation of the combustion fan 3 is repeated every T seconds, and the M fan rotation speed detection data R, to _RM (M is an integer of 1 or more) are stored. Store in memory.

Scan tape class tap 1207 in this storage the fan rotation speed detecting storage data R, Chi sales of ~ R _M, the difference between the maximum value and the minimum value as determined Umate fluctuation range, its fluctuation range Judgment is made as to whether or not it falls below the preset fluctuation range e. The variability in the fluctuation width-out bets or e is windy situation is determined, M-number of fan rotation speed detecting storage data R of sensor output target value V _sl stored in Note Li, ~ Erase _M. Their to performs stearyl Tsu Bed 1202 subsequent fan rotation speed detection storing operation by specifying a stearyl-up 12 01 Dese emissions output target value V _{S 1} again. Then, in step 1207, it is again determined whether or not the variation range of the detection storage data is smaller than the set variation range e. If the variation range is outside the set variation range e, the determination is repeated. Return Returns the sensor output detection and storage operation at the sensor output target value.

When it is confirmed in step 1207 that the variation fluctuation width falls within the range of the set fluctuation width e, it is determined that there is no wind, and the sensor output target value V _S fan rotation speed detected in ₁ Out of the storage data is be handled by as a valid data, detecting and storing data R in the stearyl Tsu-flops 1208, the average value RA of ~ R _M, is Me GaMotomu.

Stearyl Tsu whether reached the number N Gase emissions output target value V _s. 1 to V s the number of N of N-flop 1209 in the fan rotational speed average value is judged. In this example, N = l at the stage when the fan rotation speed average value RA, of the sensor output target value V _S1 is obtained. Then, if N is obtained by adding 1 to N in step 1210, then N = 2. Its to, stearyl-up 1201 Dese capacitors output target value V _{S 2} is specified, the rotation of the wind amount detection sensor of the sensor combustion output value is cormorants by that Do and V _{s 2} fan 3 Controlled. Their to, as in the case of sensor output target value V _{S 1,} Se emissions output target value V _S fan rpm under ₂ R, ~ R _M are stored detect, in situ variability fluctuation range set variation range e fan rotation speed of de one evening under windless stable situation within the scope of stored detect, the average value RA ₂ is prompted by stearyl-up 1208 .

In the jar good of this, sensor output target value V _{S 1} ~ V _SN to the average value RA of the fan rotation speed so as to correspond, after the obtained values of ~ RA _N, in the stearyl-up 1211 Is performed. The life determination operation this was prompts you 19, each sensor output target value V _{S 1} ~ V _SN to the average value RA of the corresponding fan rotation speed detection data, is ~ RA _N This is compared with the input down data RB and the life judgment data RC shown in FIG. For example, RA, is the input down data RB! Oyo Fine life determination data RC i respectively are compared, similarly Se emission fan rotational speed average value RA ₂ in the output target value V _{S 2} are of the same sensor output target value V _{S 2} b amp Tsu DOO It is compared with down data RB 2 and life judgment data RC ₂ respectively.

Ni will Yo of this, each fan rotation speed average value RA of each cell down output target value _{_{V S 1 ~ V SN, ~}} RA N the stomach in the corresponding sensor output target value Nbu Tsu door Dow Nde data RB t ~ RB _N and life determination de one evening RC: is compared to ~ RC _N. Their to, fan rotational speed average value RA, Chi sales of ~ RA _N, in the region between Lee emissions flop Tsu preparative down de one evening RB La Lee emission and lifetime determination de one evening RC La Lee down Calculate the number of fan rotation average data. If the number is equal to or greater than a predetermined reference number, a combustion capacity down signal is output. On the other hand, life determination data RC la least _two fan rotational speed average value L of the pre-given set reference number in a region beyond the fin to come to have Tsu Day TagaIri's, is determined with an instrument life And a life signal is output.

When the down command signal of the combustion capacity is output, the down control of the combustion capacity is performed as described above, and the gas supply amount is reduced to solve the shortage of the air amount. To enable the next combustion operation. When the life signal is output, the combustion stop state is locked (the combustion operation is not accepted) to prevent the combustion operation from being performed in a state where the combustion is deteriorated due to the clogged ventilation. I do. And these life judgment operations The determination result in is notified by the notification unit 1030 in a distinguished manner.

In the second embodiment, the life of the appliance is not reached, but if the ventilation is somewhat clogged and the combustion operation is performed with insufficient air, the combustion capacity is reduced. The fingering signal is output, and the combustion capacity is down-controlled. Therefore, it is possible to continue the combustion operation in a state where the shortage of the air volume has been eliminated, and to operate the water heater with the deterioration of combustion eliminated until the water heater is replaced with a new product. It is very convenient because it can be used without any problems.

Further, in the present embodiment, when the operation in the tool life diagnosis mode is performed, the burner combustion is stopped, so that the reliability of the life diagnosis operation is further improved. This has the effect of being able to produce As is well known, the ventilation resistance of the air passage (air passage) from the combustion fan 3 to the exhaust passage 29 differs between when the burner 2 is burning and when the combustion is stopped. It is known that the ventilation resistance during burner combustion is higher than during combustion stop. This increase in airflow resistance depends on the amount of heat of combustion. In this regard, in this embodiment, since the life is determined in the combustion stopped state, the life can be determined in a steady state where the exhaust resistance of the air passage does not fluctuate, so that the accuracy and reliability of the life determination are improved. Therefore, the effect of further increasing the effect can be obtained.

Further, in the above embodiment, a plurality of sensor output target values are specified, but only one sensor output target value may be specified. In the embodiment, a plurality of fans are provided for each sensor output target value. Although the number of rotations to RM is detected, only the number of rotations of one fan may be detected. In this case, the calculation for obtaining the average value is omitted, and the detected data means the average value in the present invention as it is. In other words, the operation of detecting the fan rotation speed means the operation of obtaining the average value of the fan rotation speed. In this way, by specifying one sensor output target value and detecting only one fan rotation speed and performing the life judgment, the judgment operation can be performed in a short time. It can be. However, by specifying a plurality of sensor output target values and detecting a plurality of fan revolutions as in the present embodiment, it is possible to improve the accuracy of the life determination.

Further, in the above embodiment, when the fan rotation speed of the combustion fan 3 exceeds the upper limit of the fan control characteristic data, combustion is immediately stopped to shorten the life. Moved to diagnosis operation, but this is not the case.For example, when the fan speed exceeds the upper limiter, the life diagnosis command flag is set. The treatment may be performed, and then, at an appropriate time, for example, when the device is not used after being used for combustion or before the next combustion, the life diagnosis may be performed. In this way, when performing the life diagnosis after using the appliance, even if the fan rotation speed exceeds the upper limit, combustion is not stopped and the appliance can be used continuously. Therefore, there is no inconvenience to the user, which is advantageous in terms of usability. In this case, the degree of safety is classified according to the degree to which the fan rotation speed exceeds the upper limiter, and if the risk is the highest, combustion is stopped immediately to diagnose the life. If the risk is low (small), the combustion operation can be continued and the life can be diagnosed at an appropriate time after the use of combustion. You.

Further, in the above embodiment, the fan provided to prevent runaway of the combustion fan 3 is set as the upper limit of the fan rotation speed as a reference for performing the life diagnosis. The upper limiter of the control characteristic data was used as a substitute, but the upper limiter dedicated to life diagnosis is set independently of the upper limiter for runaway prevention and fan rotation. After the number exceeds the set upper limiter dedicated to life diagnosis, the life diagnosis may be performed as in the above cases.

In the above embodiment, the rotation of the combustion fan is controlled so as to maintain the air flow at the target value, and the rotation speed is monitored, but the rotation speed of the combustion fan is maintained constant. The method of monitoring the detected airflow of the airflow sensor is technically the same. In that case, the input down data is the first airflow judgment value lower than the appropriate airflow, and the life judgment data is the second airflow judgment value lower than the first airflow judgment value. It becomes. If the detected airflow of the airflow sensor when the fan is rotated at a constant speed is lower than the first airflow determination value, operation in the input-down mode is performed. If it is done and it is lower than the second airflow determination value, the supply of fuel to the burner is prohibited.

[Third embodiment]

Further, a third embodiment of the present invention will be described below. To

The outline of the third embodiment is as follows.In the initial stage of the combustion equipment, the initial value is the air volume when the combustion fan is rotating at a constant speed under no wind. At the regular interval time, measure the same airflow under no wind and compare the two values to judge the service life.

In the third embodiment, at the time of shipment of the combustion equipment or after the installation and installation, a plurality of detection outputs of the airflow detection sensor when the rotation of the combustion fan is zero when the bar is not burning are taken. When the fluctuation range of these detection outputs is within the allowable range, the situation determination unit determines that the wind is stable.

The initial value determination section determines the initial value of the sensor when there is no wind based on the detection output of the airflow detection sensor in the stable state of no wind, and stores it in memory or the like.

Next, in a state where the burner is not burned, the combustion fan is cultivated under the set reference conditions, and when the situation determination unit determines that the wind is stable, the sensor for the airflow detection sensor is used. The sensor output is taken in, and based on this detection data, an initial value that is used as a criterion for judging the deterioration of the sensor output is determined and stored in a memory or the like.

After the initial value of the sensor in the absence of wind and the initial value for judging the ventilation deterioration are determined, the burner is not burned at a predetermined regular interval. When the combustion fan is rotating at zero speed, no wind is generated due to the output of the airflow detection sensor. A determination is made as to whether the situation is stable. When it is determined that the wind is stable, the amount of change in the sensor output value with respect to the sensor initial value at that time is obtained. When this variation exceeds a predetermined sensor determination reference value, it is determined that a sensor failure has occurred, and a determination signal is output.

If there is no sensor failure, the burner is not burned, and the combustion fan is rotated under the same set standard conditions as when the initial value was determined. Take in the output of the air supply amount detection sensor at the time of the situation as inspection data. Then, the amount of fluctuation of the inspection data with respect to the initial value, or the mutual relation between the inspection data acquired at the current interval time and the inspection data acquired at the previous interval time. The amount of variation between the two is calculated, and when the amount of variation exceeds a predetermined reference value, a warning signal is output to notify the clogged and deteriorated ventilation.

After this warning signal is output, when the burner is burned to perform normal combustion operation, the drive control condition of the combustion fan is detected, and the detected drive control condition If the upper limit of the range is exceeded, an instrument life danger warning signal is output and a danger warning is displayed on appropriate display means, while combustion operation is forcibly stopped. A third embodiment will be described with reference to the drawings. FIG. 22 shows a characteristic configuration of the present embodiment. A sampling section 2025, a situation determination section 2026, and an initial value determination section 2027 , Memory 2028, fan drive unit 2029, sensor failure judgment unit 2030, life judgment unit 2031, ventilation deterioration judgment unit 2032, input down control unit 2033, display means 2034, and a clock mechanism 2035. These are realized according to a sequence program stored in the memory in the control unit 15.

The sampling unit 2025 is, for example, based on when the power of the appliance is turned on, and when the power is turned on, starting from the power on, At a predetermined periodic interval, which is given in advance, for example, at a predetermined interval, such as after one day, one week, one month, etc. The output of the airflow sensor 16 is captured using the clock mechanism 2035 such as an image sensor. Then, it is added to the situation determination unit 2026, the initial value determination unit 2027, the input down control unit 2033, and the ventilation deterioration stabilization unit 2032 as appropriate.

As shown in FIG. 4, the condition determination unit 2026 is given in advance an allowable range e of the variation in the output of the air flow sensor 16 in a no-wind condition, as shown in FIG. As is well known, when a water heater is installed outdoors or the like, wind enters the equipment regardless of whether the combustion fan 5 is stopped when a wind condition occurs. The output of the intake air flow sensor 16 fluctuates. In the present embodiment, when there is no such fluctuation in the output of the air flow sensor 16, that is, when no wind is detected, the sensor output of the air flow sensor 16 is effectively detected. It is intended to be used as data.

In other words, the condition determination unit 2026 includes a plurality of airflow sensors 16 The output is acquired at a predetermined timing (for example, 10 data are acquired at an interval of 0.1 second), and the fluctuations of the plurality of data are dispersed. In the example, when the difference between the maximum value and the minimum value of the fetched data falls within the allowable range e, it is determined that the wind is stable. When the difference between the maximum value and the minimum value of the acquired data is out of the allowable range e, it is determined that a wind is present. Then, the results of these state determinations are added to the initial value determination unit 2027 and the ventilation deterioration determination unit 2032. In this case, only the judgment result of the no-wind stable state may be added to the initial value determination unit 2027 and the ventilation deterioration determination unit 2032. At the time, that is, when the ventilation is not clogged and the deterioration does not occur, the airflow sensor 1 taken in when the burner 2 is not burning and the combustion fan 3 is at zero rotation When the output of No. 6 is judged to be a stable windless state by the status judgment section 20 26, the sensor output of the air flow sensor 16 is determined as the sensor initial value, and the non-volatile Stored in memory 2028. In this case, for example, the minimum value or the average value of a plurality of acquired data is set as the initial value. No data will be collected if the wind condition is judged by the condition judgment unit 2026.

On the other hand, the initial value determination unit 2027 determines the initial value of the sensor when there is no wind, and then sets the combustion fan 3 to the set reference condition without burning the burner 2, and in this embodiment, the combustion fan The motor rotates at the maximum fan speed in the rotation control range of motor 3. And the wind A plurality of outputs of the quantity sensors 16 are acquired via the sampling section 2025 in accordance with a predetermined sampling timing given in advance. Then, based on the acquired data, it is confirmed that the situation judgment section 2026 has determined that the airflow is stable without wind. Reference value for judging the initial value of the sensor output at the time of the maximum rotation of the combustion fan 2 based on the output of 6 (no detection data is taken in the presence of wind) And store it in memory 2028.

The fan drive unit 2029, when determining the initial value of the initial value determination unit 2027, receives a command to rotate the combustion fan 3 at the maximum rotation speed from the initial value determination unit 2027. The combustion fan 3 is driven to rotate according to the command. In addition, the fan drive unit 2029 receives the fan drive command from the ventilation deterioration stabilizing unit 2032 in the same manner as in the case of the initial value determination unit 2027, and activates the combustion fan 3. It rotates at the maximum speed of the control range.

After the initial sensor value and the initial value of the ventilation deterioration determination are determined, the ventilation deterioration determination unit 2032 obtains the output value of the air flow sensor 16 at a predetermined interval time. Put in. Then, when the situation determination section 2026 determines that the wind is stable, the combustion fan 3 is set to the fan drive section 2029 at the maximum rotational speed of the set reference condition. Add rotation command.

When the combustion fan 3 is rotating at the maximum rotational speed, the condition determination unit 2026 determines that there is no wind under the condition that the burner 3 is not burning and the burner 3 is not burning. Have been Then, the ventilation deterioration determination unit 2032 obtains the output value of the air flow sensor 16 applied through the sampling unit 2025 at a predetermined sampling timing. Put in. Then, the variation of the output of the airflow sensor 16 with respect to the initial value for judging ventilation deterioration is obtained. In this embodiment, the absolute value of the difference between the initial value and the value of the inspection data is obtained. This variation is compared with a predetermined reference value, and when the variation exceeds the determination reference value, it is determined that clogging and deterioration of ventilation in the appliance has occurred. Outputs a warning signal to inform the clogging deterioration. In addition, clogging and deterioration of the ventilation in the equipment may be caused by soot clogging in the hot water supply heat exchanger 4, the air supply port (not shown), the curved part of the propeller of the combustion fan 3, or the pan fin. Dust and the like also accumulate and accumulate in holes and the like in gutters (not shown). Also, it is caused by the adhesion of dust to Nokuna 2.

The life judging unit 2031 rotates the combustion fan 3 during the combustion operation by burning the burner 2 after receiving the warning signal of the clogging and deterioration of the ventilation from the ventilation deterioration judging unit 2032. Detect the speed and determine whether it exceeds the maximum speed, which is the upper limit of the control range. If the upper limit of the control range is exceeded, it is judged that the ventilation state in the appliance has become severely clogged, and the life state is such that the air amount required for combustion cannot be supplied. Then, a danger warning signal is output, the burner combustion of the water heater is immediately stopped, and after that, a function such as not accepting a combustion command is added to disable the combustion operation of the appliance thereafter. I do. The input down control unit 2033 obtains the ratio of the value of the inspection data taken at each periodic interval to the initial value, and calculates the ratio in advance. When the ratio becomes smaller than the given judgment ratio, it is judged that the ventilation deterioration due to soot clogging etc. has not reached the service life yet but has advanced considerably. Then, even if the ventilation is blocked, the valve opening drive current to the proportional valve 4 is controlled so that the amount of air required for combustion can be secured, so that the valve opening amount of the proportional valve 4 is reduced. The throttle is controlled so as to reduce the amount of fuel supplied to the bar 12.

The sensor failure determination unit 2030 determines whether the burner 2 is in a non-combustion state after both the initial value of the ventilation deterioration determination and the sensor initial value are determined by the initial value determination unit 2027. When the combustion fan 3 is not rotating, the output value of the airflow sensor 16 when there is no wind is compared with the initial sensor value when there is no wind at every interval I do. That is, the amount of fluctuation of the sensor output value with respect to the sensor initial value is determined, and when this fluctuation exceeds a predetermined sensor judgment reference value, a sensor failure is determined and the Outputs a sensor failure judgment signal.

The display means 2034 includes a ventilation deterioration warning signal added from the ventilation deterioration judging section 2032, a danger warning signal added from the life judging section 2031 to inform the life of the appliance, and a sensor failure judging section. 20 The sensor failure judgment signal added from 30 is received, and these signals are distinguishably displayed on a desired display unit such as a remote control, for example. The display means 2034 can be distinguished by, for example, displaying symbols on the liquid crystal screen according to the respective modes. More distinctive indication, or by visually changing the lighting or blinking state of the lamp, or by using a buzzer, etc., the buzzer volume, continuous sound, intermittent sound, etc. Various distinctive display configurations can be employed, for example, the display is made differently according to the length of the intermittent time. In the above configuration, whether the combustion fan 3 is rotating at zero or at the maximum is determined by a signal from the fan rotation detecting sensor 28, and the burner 2 is burned. Whether it is in the state or the non-combustion state is determined by the signal of the frame rod electrode 20.

[Operation Flow of Third Embodiment]

The present embodiment is configured as described above. Next, the operation thereof will be specifically described based on the flowcharts of FIGS. 23 and 24. FIG. 23 shows an operation in which the initial value determination unit 2027 determines the initial value of the sensor no-wind output and the initial value of the ventilation deterioration determination. This operation is performed when the power of the equipment is turned on during inspection after manufacture of the equipment, or when the power is turned on after the installation of the equipment, or by setting a finger button or the like in the initial value confirmation mode. This is performed at an appropriate time, such as when an operation command is issued by using this button. In this operation, first, in step 2100, m = 0 is set. At step 2101, it is determined whether burner 2 is in a non-combustion state. This determination is made by detecting the signal of the frame opening electrode 20. If it is determined that the combustion is non-combustion, it is confirmed in step 2102 that the rotation of the combustion fan 3 is stopped.

Next, in step 2103, the sensor output of airflow sensor 16 is read. An inset is performed. In step 2104, it is determined whether the reading of the sensor output has been completed, that is, whether or not T minutes have elapsed. The reading of the sensor output is performed, for example, at a rate of one per 0.1 second. It is determined in step 2104. If it is determined that T minutes have elapsed, the difference between the maximum value (MAX) and the minimum value (MIN) of the sensor output values read in step 2105 is calculated. The difference between the maximum value and the minimum value, that is, the fluctuation range of the acquired sensor output is within the allowable range.

(E = e, in Fig. 4) is determined. If it is not within this range, it is determined that there is a wind, and even if data is collected, it will not be valid data due to the effect of the wind. After waiting for 24 hours, the operation after step 2101 is performed again.

On the other hand, if it is determined in step 2105 that the difference between the maximum value and the minimum value is within the range of eI, the minimum value among the plurality of read data is obtained. Or the mean, in this case the mean, is stored in memory as VM, N (m) (in this case, m, 0, VM, N (0)). This V _MIN (0) is one of the initial sensor values when there is no wind o

Next, in Step 2107, the combustion fan 3 is rotated at the maximum number of revolutions in the control range (3000 rpm in this example) without burning the burner 2 in Step 2107, and in Step 2108, the sensor of the air flow sensor 16 is rotated. Out Perform a force read.

Also in this case, a plurality of data readings of the sensor output value are performed, and it is determined in step 2109 whether or not the reading time has elapsed. When the reading time has elapsed, the variation in the maximum and minimum values of the multiple sensor output values read in the same manner in step 2110 is determined, and this variation is allowed to be set. It is determined whether it is within the range of the fluctuation range e ₂ (e = e _{2 in} Fig. 4). To come and have a have entered the range e ₂ of this, it is determined that because of the windy you are Day Tagaba variability change, without collecting the data, and wait 24 hours, stearyl The operation after step 2101 is repeated. The can with the difference between the maximum value and the minimum value stearyl-up 21 10 is one input to e ₂ of the set allowable variation range, it is determined that no wind stable situation. Its to, Chi sales of multiple data that has been read, a maximum of also of, there have an average value (average value in the example of _{this), V MA X (m)} ( in the case of now times m is 0 der Runode, store in Note Li as a V _{MA X} (0)). This is one of the initial values for ventilation deterioration judgment.

Then, in step 2112, it is determined whether m is 3 or not. If the m-force has not reached 3, m is incremented by one in step 2114. (In this case, m is incremented from 0 to 1.) In step 2115, wait one week. Then, the operation after step 2101 is performed again. By performing the operations after step 2101 in this manner, the initial sensor values in the absence of wind from four V _MIN (0) to V _M , until m becomes 3 are obtained. _N. (3) the value of the value of the four initial values V _MAX for ventilation deterioration determination _{(0) ~ V MA X (} 3) is stored.

To come and it is determined that m = 3 in the stearyl-up 2112, the stearyl Tsu-flops 2113, ¥ "^ (0) ~ V M, N 4 pieces of the value, on average calculation of a no-flow condition of (3) Determine the sensor initial value V _{MIN Similarly} , determine the average value of the four V _MAX (0) to V _MAX (3) values, and the combustion fan is rotating at the maximum speed At this time, the initial value V _MAX for the judgment of ventilation deterioration is determined, and the respective determined values V _M , _N and VMAX are stored in the memory 2028. Steps 2100 to 2113 largest Ri by the operation, the water heater is calm Tokise capacitors initial and V _M during fan zero rotation of the feeder and Ri is not clogged ventilated immediately placed construction, and _N, the combustion fan The initial value V _{MAX, which} is the standard for judging deterioration of ventilation without rotation clogging during rotation, is fixedly recorded.

Figure 24 shows the initial value V _MAX and the sensor initial value when there is no wind.

After V, and Ν are determined and recorded, at regular interval time intervals, for example, ventilation deterioration and equipment life, which occur every L times or every 月 months, etc. This is the action flow to make a decision. First, in step 2200, Ρ = 0 and Ν = 0 are set. Next, in step 2201, the same operation as that of steps 2101 to 2111 of the flowchart shown in FIG. 23 is performed. The value of the sensor output V _Μ , Ν (における) when the fan is at zero rotation, and the same value when the combustion fan 3 is rotated at the maximum rotation of the control range when the wind is stable. _Sensor output V _ΜΑΧ (Ν) and Tube.

Next, the absolute value of the difference between the sensor no-wind output initial value V _MIN previously determined and stored in step 2202 and V _MIN (N) determined in step 2201 is calculated as the amount of change. This variation is compared with a sensor determination reference value given in advance, in this embodiment, the tolerance range of the air flow sensor 16 to determine whether the variation falls within the tolerance range. I do . If the variation is out of the tolerance range, it is determined in step 2209 that the airflow sensor 16 has failed, and the sensor failure determination unit 2030 outputs a sensor failure determination signal. Is output and a display to that effect is displayed on the display means 2034. When the variation is within the tolerance range, the air flow sensor 16 is determined to be normal, and the operation proceeds to the next step 2203.

In stearyl-up 2203, in advance an initial value V _{MA X} that has been determined, the stearyl Tsu Tsu non-combustion time der obtained in flop 2201, and our Keru inspected at the maximum rotation of the combustion fan 3 based on the value of the data values V _{MA X} (N), (the ratio of V _{MA X} (N) and V _{_{MA X)}} V _{MA X} ratio to the initial value VMAX (N), the Guy emissions flop Tsu preparative down control Required by part 2033. Then, it is determined whether or not this value is smaller than a predetermined determination ratio. An appropriate set value can be given as this determination ratio, but in the present embodiment, it is set using graph data as shown in FIG.

In FIG. 25, V _Α , is the sensor of the air flow sensor 16 when the fan rotation speed of the combustion fan 3 is changed during non-combustion. The sensor output is shown. This VA1 data is the data for _{A, when the} passage area through which the wind in the instrument is not completely blocked. Similarly, the relationship data between the fan rotation speed and the sensor output when the closing ratio is changed in multiple stages, for example, the closing ratio is 90%, 60%, 50%, and 3.0%. Is required separately. This V _A1 data is obtained immediately after the appliance has been manufactured, with no blockage of the ventilation yet ο

V _{A 2} of graph data is variable during the entire Ku no state of deterioration Jam passing wind like immediately after the production of the same rather instrument, a bar one Na 2 by combustion, the fan rotational speed This is a graph showing the sensor output of the airflow sensor 16 at that time. In general, the ventilation resistance is higher during combustion than during non-combustion.Therefore, the passage area with the passage area blocked by Y% is ₂ % of the normal output V _{A 1} during non-combustion. data of the fan speed and the sensor output is present What Do the equivalent data of V _{a 2} at the time of non-combustion. Incidentally, blockage rate Y% of the value of meeting pair to an increase in ventilation resistance at the time of combustion for time of non-combustion since it is determined by a known value, the passage area Alpha ₂ at that time is also determined by a known value. Therefore, in fact, graph data of V _{A 2} is obtained Ri by the V _A, graph data or et al calculation of. Ron Chi may also actually by combustion seek de one evening V _{A 2.}

V _{A 4} of the graph data in the data indicating the output of Kazeryouse capacitors 1 6 when abnormal combustion, Ri by the normal state to the output V _{A 2} at the time of combustion, deterioration jams ventilated, closed rate Has become W% Assuming that V _A1 or V _A2 , it can be obtained by calculation. Note that W% is obtained from the case where the amount of carbon monoxide and the like in the exhaust exceeds a certain amount.

V _A3 indicates sensor output data at the time of non-combustion and abnormalities where clogging and deterioration of ventilation occur, and V _A3 is the above known value of V _{A. It is obtained from 1} , A2 and A4 by the following formula. _{_{V A 3 = V A 1 x}} A 4 / A 2. In addition, assuming that the passage area of the ventilation when the graph data of V _A1 is A, and that the blocking area is V _A2 , VA 3, and V _{A 4 with} respect to the passage area A, respectively. this different that the door Ri name, the passage area of the ventilation in the graph data of V _{a ₂ a 2,} graph data V _{a 3} of the door-out of the passage area a _3, the graph data V _{a 4} DOO Kino passage area is given as the value of a _4.

Abnormal corresponding sensor output V _A3 at the time of non-combustion in the present embodiment, a value obtained by multiplying the ratio V _{A 3} constant K to ZV _{A 1} of the normal sensor output V _{A 1} during the non-combustion as a determination ratio Is set. Its to, in stearyl-up 2203, since the deterioration of jams ventilation in-out door V _{MA X} ratio is equal to or greater than the determination ratio of (N) for the V _{MA X} is in La no good combustion conditions, such as the problem, this In this case, the combustion operation of the water heater is performed in the normal operation state of the combustion control.

To come to the rate of V _MAX (N) is less also Ri by determining the ratio for V _MAX, it is determined that the state impact of the deterioration of jams ventilation is Ji raw, in the gas-this of the, of the following: In step 2204, it is determined whether or not the rotation speed of the combustion fan 3 has reached the maximum rotation speed in the control range. When the combustion fan reaches the maximum speed Otherwise, even if the effects of clogging and deterioration of the ventilation occur, there is room to increase the air volume, so in this case, normal combustion operation control is performed.

On the other hand, when the fan speed of the combustion fan 3 has reached the maximum speed of the control range (3000 rpm in this embodiment), 1 is added to P, and In step 2205, a determination is made as to whether P = 2. In this case, since P = 1, P is not 2, and in this case, in step 2206, the input down control unit 2033 executes the ' The combustion operation is performed by controlling the gas supply amount to the burner 2 in the direction of decreasing X%. In step 2207, the sampling unit 2025 determines whether the next predetermined period of time, for example, whether the number of combustion times L or M months has elapsed, is performed by the clock unit 2035. When the interval time has arrived, N is increased to 1 in step 2208.

If it is determined in step 2205 that P = 2, it is determined in step 2211 whether or not the air is completely blocked and deteriorated. That is, the initial value VMAX of the ventilation deterioration determination determined in step 2113 of the flow chart shown in FIG. 23 and the step 2201 for each interval time are determined. Request Installing variation amount of the detection data (inspection data evening) V _{MA X} (N) to be written in the absolute value of the difference of V _{MA X} and V _{MA X} (N). Then, it is determined whether or not this variation is larger than a predetermined reference value D. In here, D is, in this example _{D = (V A 1 - V} A 3) as the value of Z 2 Have given. If the amount of change between the initial value and the inspection time is not greater than D, it is determined that deterioration of the ventilation clogging has not occurred and no warning signal is output. . On the other hand, when the variation between the initial value and the inspection data exceeds the criterion value D, dust or the like may be deposited on the curved surface of the propeller of the louver combustion fan 3, Step 22 1 2 It is judged that clogging of the burner or soot clogging of the hot water supply heat exchanger 8 caused clogging and deterioration of ventilation. To output a warning signal, and the display means 2034 indicates that.

Next, in step 2213, during the operation in which the water heater burner 2 is burned after the warning signal is output, the fan rotation speed of the combustion fan 3 increases the maximum rotation speed of the control range. It is determined whether or not the rotation speed (upper limit) has been reached. When the fan rotation speed has not reached the upper limit, combustion operation is continued because there is still room in the direction in which the rotation of the combustion fan 3 is to be ablated. However, when the fan rotation speed exceeds the upper limit, the clogging and deterioration of the ventilation are considerably worse, and even if the rotation of the combustion fan is set to the maximum rotation, the combustion It is determined that the life state is short of the amount of air, and in this case, the life determination unit 2031 outputs a danger warning signal indicating the life. Then, the danger message is displayed on the display means 2034, the combustion operation of the partner 2 is forcibly stopped, and the subsequent combustion of the partner is disabled, resulting in poor combustion. Avoid danger.

In the above embodiment, the setting reference condition of the combustion fan is set at the maximum number of revolutions of the rotation control range of the combustion fan 3, but the maximum The rotation speed may be set slightly lower than the rotation speed, and the set reference condition may be given not by the rotation speed but by the drive current and work amount of the combustion fan 3. You can do it.

Furthermore, in the above embodiment, the judgment reference value D given in step 2211 of the flowchart of FIG. 24 may be obtained in advance and given as external input data. bur, even in the earthenware pots by the instrument itself obtains the data in the V _{a 1} in FIG. 2 5 rotates the combustion fan 3, sets seeking determination reference value D by performing the self-et processing Good. May be given by _{_{- (V A 3 V A 1}} ) / 2 value other than Ron D Chi also is D =.

Further, in the above embodiment, when judging the deterioration of the ventilation clogging, the ventilation deterioration judging unit 2032 determines the ventilation deterioration as shown in Step 22 of the flowchart in FIG. , but it was determined the amount of variation in One by the absolute value of the difference between the draft decision of deterioration of the initial 16 · VMAX and inspection data V _MAX (N), Unlike this, of this time i te one Bal time The absolute value of the difference between the inspection data V _{MA x} (N + 1) captured at the previous interval and the inspection data VMAX (N) captured at the previous interval time, that is, The amount of change in the interval intake inspection data (corresponding to the change in the slope of the data) is the amount of change that determines ventilation deterioration based on the absolute value. The value D may be compared with that of the above-described embodiment, and the deterioration of the ventilation clogging may be determined by the ventilation deterioration determining unit 32. In this way, it is not necessary to consider the case where the initial value of the sensor fluctuates with the passage of time. Is known. This may be due to the fact that the heat exchanger is oxidized first, causing incomplete combustion of the wrench, resulting in more soot and more airflow clogging. Will be understood. Therefore, there is no practical problem by comparing with the previous data.

In addition, the situation determination unit of the above embodiment distinguishes between a stable windless situation and a windy situation based on the degree of variation in the detection data of the air supply amount detection sensor (airflow sensor 16). . However, the number of revolutions of the combustion fan 3 is controlled so that the sensor output of the air flow sensor becomes constant, and the fan rotation detection sensor detects the rotation speed of the combustion fan 3 at this time. When the fluctuation range of the fan rotation speed is within the set allowable fluctuation range, it is determined that there is no wind stability, and when it is out of the set allowable fluctuation range, it is determined that there is wind. Good. In this case, the fan drive current and work amount are detected instead of the fan rotation speed, and whether or not the fluctuation range of the detected data is within the set allowable fluctuation range. In the same way, it may be possible to distinguish between a stable windless situation and a windy situation.

As described above, in the case where the determination of the presence or absence of wind is made based on variations in the driving conditions such as the fan rotation speed, the determination of ventilation clogging and deterioration is also determined by the fan rotation speed and the like. The determination can be made based on the magnitude of the variation in the driving conditions. In this case, for example, the drive conditions such as the fan rotation speed when the ventilation output that has the sensor output of the airflow sensor at the set value has not occurred are set as the initial values. Good. And the place For each fixed interval, determine the driving conditions such as the fan speed at which the sensor output of the airflow sensor has the same set value. Then, the amount of change between the fan driving condition and the initial value at each interval time, or the fan driving condition obtained at the current interval time and When the amount of change from the fan drive condition obtained in the previous interval time exceeds the judgment reference value, it is judged that the ventilation clogging and deterioration have occurred. become.

In the third embodiment, the initial value of the sensor in the absence of wind when the combustion fan is at zero rotation when there is no clogging deterioration of the ventilation fan, and the combustion fan is determined based on the set reference conditions. The initial value of the judgment of deterioration of the ventilation when rotating is fixed and stored in advance as a non-combustion state in advance, and is stored at predetermined intervals. The clogging and deterioration of the ventilation are detected based on the amount of change in the inspection data to be entered from the initial value. Therefore, it is possible to determine the initial value of the air flow sensor having characteristics that vary depending on the combustion equipment, not at the time of shipment from a factory, but in a state according to the environment after construction. As a result, it is possible to more accurately determine the life due to deterioration of the ventilation clogging.

Further, in the third embodiment, the detection data of the airflow sensor when the rotation of the combustion fan is zero at every interval time is acquired, and the sensor at the time of no wind is acquired. Since the presence or absence of a sensor failure is determined by calculating the amount of fluctuation with respect to the sensor initial value, the sensor output value is a valid value regardless of the sensor failure. As a result, it is possible to increase the reliability of the judgment of ventilation clogging and deterioration and the processing

[Fourth embodiment]

In the third embodiment described above, if the output of the airflow sensor # 6 in a no-wind state fluctuates from the initial value by a tolerance or more, it is determined that the airflow sensor has failed. However, depending on the airflow sensor, if the zero point fluctuates, the airflow sensor can be used continuously by correcting it to the initial zero point by the amount of the fluctuation. Can be done. The fourth embodiment is characterized in that the zero point value, which is the output value of the airflow sensor 16 in a no-wind state, is detected and corrected.

Figure 26 details the zero point detection flow. In the example of Fig. 26, the zero point correction is performed at the time of cold start.

As shown in Fig. 26, when the hot water tap is opened and the flow sensor is started, first, as the initial values, the output frequency m of the inappropriate data signal is 0, the air flow sensor 16 0 is given to the maximum value V omax and the minimum value V omin of the output value.

In step 3001, the output value V0 of the air flow sensor 16 is recorded in the memory.

In step 3002, the output value V 0 of the air flow sensor 16 recorded in the memory is compared with the 0-point output upper limit value V 0 max 1 imit recorded in the same manner. With, 0 point output lower limit Also compare with V o minlimit.

In step 3003 to step 3004, if the output value V 0 is equal to or less than the 0-point output upper limit value V 0 max1 imit and equal to or greater than the 0-point output lower limit value V o minlimit, The output value Vo of the sensor 16 is sequentially sent to the memory 30 as the recording data Vo, i.

In step 3002, the output value V 0 becomes the 0-point output upper limit

If V 0 ma X 1 imit or more, or 0 point output lower limit value V o minlimit or less, the sensor output value V o is stored in memory as inappropriate data. It is erased from. Then, in step 3013, the number of times that the incorrect data signal has been output to memory is recorded.

In steps 3005 to 3006, the sensor output value Vo, i stored and adopted in the memory is set to the maximum value Voma, and the maximum value Vomax is used next. The data to be processed is compared with V o, i, and the larger value is stored in memory as the maximum value V o max. In this way, the maximum value Vo max is selected from the sensor outputs Vo and i which are sequentially adopted in step 3002.

In steps 3007 to 3008, the minimum value Vo min is selected from the sensor output values Vo and i in the same manner as described above.

In step 3009, the difference between the maximum value Vo max and the minimum value Vo min is sequentially calculated, and the difference between the two is compared with the allowable fluctuation range e. Wind is generated The sensor output is detected again as incorrect data. On the other hand, if the difference is within the allowable range, it is determined that there is no wind, and the detected data is recorded in memory as an appropriate data.

In step 3010, is the sensor output value V o, i stored in the memory as an appropriate delay in a no-wind condition reached to a predetermined number t? When the judgment is made, and a certain amount of data is reached, a predetermined number t of recording data Vo, i is adopted as the data for correction.

Then, in step 3011, the average value of the correction data is calculated, and the average value is stored in the memory as the zero-point correction value V0 of the airflow sensor 16 and thereafter, It will be used for determining the service life and controlling the air flow.

If it is determined in Steps 3002 and 3009 that the data is incorrect, in Step 3014, the number m of times determined to be an incorrect data signal is compared with the predetermined number M. If m <M, reset (step 3016) and perform the operation of detecting the air flow sensor output after step 300 again. If m = M, an appropriate zero point cannot be detected, an error signal is output, and the execution of the zero point correction ends. In this case, the zero point correction is performed again after a certain period of time. In addition, if the error signal is repeated, it is possible that the airflow sensor 16 is out of order or the service life has expired.

In step 3012, the zero point value obtained as described above is used as a new zero point using the airflow sensor corrected. Then, it moves to the post fan ignition sequence and enters the normal combustion operation. It should be noted that the present invention is not limited to the above-described first to fourth embodiments, but can adopt various embodiments. For example, in the above embodiment, the burner 2 is configured with the three-stage combustion switching system. However, the burner 2 may be configured with a multi-stage combustion switching system other than the three-stage combustion switching system or with the combustion switching system. A burner other than the burner may be used.In the above embodiment, the differential pressure in the upper and lower sections of the burner 2 sandwiching the burner 2 is detected by the differential pressure sensor 16 which is the air flow sensor. However, this differential pressure can be detected by detecting the differential pressure between an arbitrary upstream and downstream section of the air flow path from the air supply section to the burner to the exhaust passage. The differential pressure between the combustion fan's inlet and the combustion chamber section, the differential pressure between the combustion fan's air outlet side and the combustion chamber's section, or the pressure difference between the combustion fan's intake port and Differential pressure in the section between the blower outlet and the exhaust top above the hot water heat exchanger, the combustion chamber and the exhaust top The path section for differential pressure detection, such as the differential pressure in the section above, can be set to an infinite number of other sections. However, when the differential pressure is detected between the lower side and the upper side of the spanner with the spanner 2 as in the present embodiment, compared to the hot water supply heat exchanger, etc. Since there is almost no clogging, there is almost no change in the air resistance through the burner 2 with time, and the air volume sent out from the combustion fan 3 is reduced. It is possible to detect accurately with differential pressure, and from this point

However, it is desirable to adopt a method of detecting a differential pressure in a path section sandwiching the parner 2 as in the present embodiment.

Further, in the above embodiment, the differential pressure sensor 16 was used as the air volume detection sensor. However, instead of the differential pressure sensor 16, for example, a heat dicing heater or The air volume can be detected directly or indirectly by using a Kalman vortex type wind speed sensor or by using a rotary air flow meter that detects the air volume directly. A variety of available sensors can be used.

Further, in the above embodiment, the setting control condition of the combustion fan is given by the fan rotation speed. However, the setting control condition of the combustion fan depends on the driving current of the combustion fan and the amount of work. May be given under other control conditions. At this time, the combustion fan is rotated under these fan drive current and work load setting conditions, and the air flow detection value and the air flow judgment value are compared to determine whether the equipment is abnormal. Otherwise, the life is judged.

Also, it was explained that the determination of whether there is no wind was made by monitoring whether or not the output of the airflow sensor had variations. However, when the combustion fan is rotating, the rotation speed of the fan may be controlled so that the output of the air flow sensor becomes constant. In that case, by monitoring the variation of the fan speed, it is possible to detect whether there is no wind or not. Of course, the same applies when monitoring the power of the combustion fan.

In addition, a combustion fan is required to determine the life or abnormality. This can be done by monitoring whether the motor is rotating at the above speed or if the output of the air flow sensor is less than necessary.

Further, in the above embodiment, a single-purpose water heater (a water heater having only a hot-water supply function) has been described as an example of a combustion device. However, the present invention is not limited to a hot-water supply and a reheating or a hot-water supply. It is applied to combined water heaters that have both functions such as hot water heating, and other combustion equipment that has various burners, such as bath kettles, heaters, air conditioners, air conditioners, and air conditioners.

Furthermore, in the above embodiment, the combustion fan 3 was pushed in, but this may be sucked out, which is a matter of course. . INDUSTRIAL APPLICABILITY As described above, the combustion equipment according to the present invention can perform combustion control while suppressing the amount of exhausted carbon monoxide, hydrocarbons, and nitrogen oxides. It is possible to prevent incomplete combustion from occurring due to soot clogging in the inside or unexpected clogging of the exhaust port.

Further, in the present invention, in order to prevent incomplete combustion, it is determined whether or not the relationship between the air volume and the rotation of the combustion fan is within a normal range. At that time, it monitors the output of the airflow sensor or the number of revolutions of the combustion fan when there is no wind in the outside world. Therefore, inspection without external influence It does not make unnecessary failure decisions.

Further, according to the present invention, the relationship between the air volume and the number of revolutions of the combustion fan is monitored, and if it is out of the normal state to the first range, the amount of gas supplied to the combustion burner is first reduced. The input-down operation is performed first. If the relationship between the air volume and the number of revolutions of the combustion fan further deviates from the normal state to the second range, it is determined that the combustion equipment has reached the end of its life and the combustion operation is stopped. I'm doing it. As a result, unnecessary repair and disposal of combustion equipment can be eliminated.

Further, according to the present invention, by detecting the initial value of the air flow sensor first, the value of the air flow sensor can be appropriately used for each product and installation environment.

Further, in the present invention, by performing zero point correction using the output value of the airflow sensor detected in a no-wind state, it is possible to eliminate the adverse effects due to aging of the sensor. You.

Claims

The scope of the claims

1. A burner that supplies and exhausts air to and from the burner, and an air flow sensor that detects the amount of air flowing through an air flow path from the air supply passage to the exhaust passage to the burner. In combustion equipment,

A control unit for detecting a windless state when a variation in the detected airflow of the airflow sensor detected based on zero rotation or constant rotation of the combustion fan is within a predetermined allowable range; Combustion machine si ₀

2. The control unit according to claim 1, wherein

When the detected air flow of the air flow sensor, which is detected based on the rotation of the combustion fan or at a constant rotation, is maintained within a predetermined range for a predetermined time, a change in the detected air flow is obtained. Combustion equipment characterized in that it is determined that the temperature is within the allowable range

3. A burner that supplies and exhausts air to and from the burner, a rotation speed detection device that detects the number of rotations of the combustion fan, and an exhaust passage from the air supply passage to the burner Combustion equipment equipped with an air flow sensor that detects the amount of air flowing through the entire air distribution path,

The detected air volume of the air volume sensor is set to a constant value. The rotation speed detection device detected when controlling the rotation of the combustion fan A combustion device having a control unit that determines that there is no wind when the fluctuation of the detected rotation speed of the device is within a predetermined allowable range.

4. In Claim 3, the control unit comprises:

The rotation speed detected by the rotation speed detection device, which is detected when controlling the rotation of the combustion fan so that the air volume detected by the air volume sensor becomes a constant value, is within a predetermined range for a predetermined time. A combustion apparatus that determines that the fluctuation of the detected rotation speed is within an allowable range when the temperature is maintained at a predetermined value.

5. A burner that supplies and exhausts air to and from the burner and an air flow sensor that detects the amount of air flowing through the air flow path from the air supply passage to the exhaust passage to the burner In the combustion equipment

The airflow judgment value serving as a reference for judging abnormality or life when the combustion fan is rotated at a predetermined rotation speed is stored, and the combustion fan is rotated at zero rotation or at a constant rotation. Detecting a no-wind condition when the variation of the detected airflow of the airflow sensor detected within the original range is within a predetermined allowable range;

When the no-air condition is detected, if the detected airflow of the airflow sensor when the combustion fan is rotated at a predetermined speed is lower than the airflow determination value, control for detecting abnormality or life is performed. Combustion equipment having a part.

6. A burner that supplies and exhausts air to and from the burner And a rotation speed detection device for detecting a rotation speed of the combustion fan, and a flow rate sensor for detecting a flow rate flowing through an air flow path from an air supply passage to the burner to an exhaust passage. Equipped combustion equipment,

When the no-air condition is detected, the detected rotation speed of the rotation speed detection device when the rotation of the combustion fan is controlled so that the detected air volume of the air volume sensor becomes the constant reference value is determined as the rotation speed determination. Combustion equipment that has a control unit that detects an abnormality or life when the value is higher than the value.

7. A burner that supplies and exhausts air to and from the burner and an air flow sensor that detects the amount of air flowing through an air flow path from the air supply passage to the exhaust passage to the burner. In the combustion equipment

The airflow determination value serving as a criterion for judging abnormality or life when the combustion fan is rotated at a predetermined rotation speed is recorded, and the combustion fan is rotated at the predetermined rotation speed. Fluctuation of the detected air volume of the air volume sensor detected when the motor is rotated A combustion device having a control unit for detecting an abnormality or life when the air flow sensor is within the range and the air flow detected by the air flow sensor is lower than the air flow determination value.

8. A burner that burns and exhausts air to and from the burner, a rotation speed detection device that detects the rotation speed of the combustion fan, and an exhaust passage from an air supply passage to the burner. A combustion device equipped with an airflow sensor that detects the amount of airflow flowing in the airflow path,

A rotation speed judgment value which is a reference for judging abnormality or life when the rotation of the combustion fan is controlled so that the air flow detected by the air flow sensor becomes a constant reference value is stored.

Fluctuations in the rotation speed detected by the rotation speed detection device, which are detected when the rotation speed of the combustion fan is controlled so that the air volume detected by the air volume sensor becomes the constant reference value, are within a predetermined allowable range. A combustion apparatus having a control unit that detects an abnormality or life when the rotation speed detection device detects a rotation speed higher than the rotation speed determination value even at a certain time. 9. In claim 5 or 7,

The combustion device further includes a fuel control unit that supplies fuel required for supplying a required amount of heat to the parner,

When the abnormality or the life is detected, the fuel control unit forcibly reduces the amount of fuel supplied to the parner. And a combustion device.

10. In claim 9,

The air volume determination value has a first air volume determination value and a second air volume determination value,

If the detected airflow of the airflow sensor is lower than the first airflow determination value when the abnormality or the life is detected, the fuel control unit forcibly supplies the fuel supplied to the parner. Reduce

The combustion device, wherein when the detected air volume of the air volume sensor is lower than the second air volume determination value, the fuel control unit does not supply fuel to the burner.

1 1. In Claim 6 or 8,

A combustion apparatus characterized in that, when the abnormality or the life is detected, the fuel control unit forcibly reduces the amount of fuel supplied to the parner.

1 2. In claim 11,

The rotation speed determination value has a first rotation speed determination value and a second rotation speed determination value,

When the abnormality or life is detected, the rotation speed detection is performed. When the detected rotation speed of the delivery device is higher than the first rotation speed determination value, the fuel control unit forcibly reduces the amount of fuel supplied to the parner,

The combustion apparatus, wherein when the rotation speed detected by the rotation speed detection device is higher than the second rotation speed determination value, the fuel control unit does not supply fuel to the burner.

13. A burner that supplies and exhausts air to and from the burner, and an air flow sensor that detects the amount of air flowing through an air flow path from the air supply passage to the exhaust passage of the burner. In the equipped combustion equipment,

When the fluctuation of the airflow detected by the airflow sensor, which is detected based on zero rotation or constant rotation of the combustion fan, is within a predetermined allowable range, a no-air condition is detected. The detected airflow of the airflow sensor when the combustion fan is rotated at a predetermined speed is stored as an initial value,

After the predetermined time has elapsed after the initial value has been stored, when the above-mentioned no-air condition is detected, the detected air volume of the air volume sensor when the combustion fan is rotated at the predetermined rotation speed is detected. A combustion apparatus having a control unit for detecting deterioration of ventilation when the initial value has changed by a criterion value or more from the initial value.

14. The control unit according to claim 7, wherein the controller detects the deterioration of the ventilation when the difference between the detected airflows of the airflow sensor obtained before and after the lapse of a predetermined time is equal to or greater than the determination reference value. Combustion equipment characterized by performing.

15. Pana, a combustion fan that supplies and exhausts air to and from the burner, a rotation speed detection device that detects the rotation speed of the combustion fan, and an exhaust passage from the air supply passage to the burner Combustion equipment equipped with an airflow sensor that detects the amount of airflow flowing in the airflow path,

Fluctuations in the rotation speed detected by the rotation speed detection device detected when the combustion fan is controlled to rotate so that the air flow detected by the air flow sensor reaches a certain reference value are within a predetermined allowable range. When no wind is detected, the detected rotation speed of the rotation speed detection device at that time is stored as an initial value,

When the windless state is detected after a predetermined period of time after storing the initial value, the number of tillers detected by the rotation speed detecting device at that time fluctuates by a value equal to or more than the determination reference value from the initial value. A combustion device that has a control unit that detects deterioration of ventilation when it has been operating.

16. The control unit according to claim 15, wherein the control unit detects the deterioration of the ventilation when a difference between the detected rotation speeds of the rotation speed detection device obtained before and after a predetermined time passes is equal to or greater than the determination reference value. Combustion equipment characterized by performing the following. (Example of 578)

1 7. A combustion fan for supplying and exhausting air to and from the burner; and an airflow sensor for detecting an airflow flowing in an air circulation path from an air supply passage to the exhaust passage to the burner.

A heat exchanger located on the air flow path and connected to an inlet pipe for supplying a heat medium from the parner and supplying a heat medium and an outlet pipe for delivering the heat medium;

A fuel control unit for supplying the burner with fuel necessary for maintaining the heat medium sent from the outlet pipe at a set temperature;

A fan control unit that controls the rotation of the combustion fan so as to maintain an appropriate air volume for burning the fuel with the wrench.

The airflow judgment value serving as a reference for judging abnormality or life when the combustion fan is rotated at a predetermined rotation speed is stored, and the combustion fan is controlled at zero rotation or constant rotation. When the variation of the detected air volume of the air volume sensor detected in the above is within a predetermined allowable range, a no-air condition is detected,

When detecting the no-air condition, if the detected airflow of the airflow sensor when the combustion fan is rotated at a predetermined rotation is lower than the airflow determination value, a controller for performing abnormality or life detection. Combustion equipment having.

1 8 <

A combustion fan that supplies and exhausts air to and from the burner; a rotation speed detection device that detects a rotation speed of the combustion fan; An airflow sensor for detecting an airflow flowing in an air circulation path from an air supply passage to the burner to an exhaust passage;

A heat exchanger located on the air circulation path and connected to an inlet pipe for supplying a heat amount from the parner and supplying a heat medium and an outlet pipe for sending and receiving the heat medium;

A fuel control unit that supplies fuel necessary for maintaining the heat medium sent from the outlet pipe at a set temperature to the parner;

A fan control unit that controls the rotation of the combustion fan so as to maintain an appropriate air volume for burning the fuel with the burner.

A rotation speed judgment value, which is a reference for judging abnormality or life when the combustion fan is controlled to rotate so that the air flow detected by the air flow sensor becomes a constant reference value, is stored.

Fluctuations in the rotation speed detected by the rotation speed detection device, which are detected when the rotation speed of the combustion fan is controlled so that the air volume detected by the air volume sensor becomes the constant reference value, are within a predetermined allowable range. A combustion apparatus having a control unit that detects an abnormality or life when the rotation speed detection device detects a rotation speed higher than the rotation speed determination value even at a certain time.

19. A burner that supplies and exhausts air to and from the burner, and an air flow sensor that detects the amount of air flowing through the air flow path from the air supply passage to the exhaust passage to the burner In combustion equipment equipped with Detecting a no-air condition when the variation of the airflow detected by the airflow sensor, which is detected based on zero rotation of the combustion fan, is within a predetermined allowable range;

A combustion device having a control unit that stores the detected airflow of the airflow sensor as a zero point when the airless state is detected.

2 0.

A combustion fan that supplies and exhausts air to and from the burner, a rotation speed detection device that detects the rotation speed of the combustion fan, and an air flow passage from an air supply passage to an exhaust passage of the burner. An airflow sensor that detects the amount of air flowing,

A heat exchanger located on the air flow path, connected to an inlet pipe for supplying a heat medium from the parner and supplying a heating medium, and an outlet pipe for delivering the heat medium;

Detecting a no-air condition when the variation of the airflow detected by the airflow sensor, which is detected based on zero rotation of the combustion fan, is within a predetermined allowable range;

21. A parner, a combustion fan for supplying and exhausting air to and from the burner, and an air flow sensor for detecting the amount of air flowing in an air flow path from an air supply passage to an exhaust passage of the burner. In the equipped combustion equipment,

An airflow judgment value serving as a reference for judging abnormality or life when the combustion fan is rotated at a predetermined rotation speed is stored, and the combustion fan is rotated at the predetermined rotation speed. When the detected air flow of the air flow sensor detected when the air flow sensor is detected is lower than the air flow determination value continuously within a predetermined time, a control unit that detects an abnormality or a life is provided. Combustion equipment.

22. A burner that supplies and exhausts air to and from the burner, a rotation speed detection device that detects the rotation speed of the combustion fan, and an exhaust passage from the air supply passage to the burner Combustion equipment equipped with an airflow sensor that detects the amount of air flowing through

The detected air volume of the air volume sensor will be a fixed reference value. ぅ Store the rotation speed judgment value that is the standard for judging abnormality or life when controlling the rotation of the combustion fan. ,

The rotation speed detected by the rotation speed detection device, which is detected when the rotation speed of the combustion fan is controlled so that the air volume detected by the air volume sensor becomes the constant reference value, is continuously within a predetermined time. A combustion device having a control unit for detecting abnormality or life when the rotation speed is higher than the rotation speed determination value.