JPH0735903B2 - Combustion control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion appliance control device, and more particularly to a combustion stop process in the event of an abnormality.

2. Description of the Related Art Conventional technology will be described by taking an oil fan heater as an example. Generally, as shown in FIG. 7, a burner of this kind has a burner 3, a fan 4 for hot air and its motor 5 inside a space surrounded by an exterior 1 and a stand 2, and a controller 6 for controlling these components.
Is provided, and the room air A is mixed with the combustion gas B by the fan 4 and discharged as warm air C having an appropriate temperature from the louver 7 to be used for heating the room.

Further, the burner 3 is, as shown in FIG. 8, a vaporization cylinder 8 for vaporizing combustion kerosene, an electromagnetic pump 9 for supplying a fixed amount of kerosene, a burner motor unit 10 for feeding combustion air, and an ignition electrode for igniting vaporized kerosene. 11. A flame lot 12 for monitoring the state of the combustion flame D is provided.

FIG. 5 shows the internal wiring of the controller of the oil fan heater. Power supply 13-a point-Run switch 14-b
The point-contact point 15-c point-electromagnetic pump 9-d point constitutes a closed loop. An igniter 41 is connected between points cd and its high voltage terminal is connected to the ignition electrode 11. A power transformer 16 is connected between points a and d,
The DC power supply circuit 17-control circuit 18 is connected to this.
The control circuit 18 is the oscillation circuit 19 of the electromagnetic pump 9, the relay contact 1
In addition to controlling loads such as 5, 45, the burner motor 10 and the blower motor 5, it receives switch signals from the display and operation button unit 20 and sends signals to the display and operation button unit 20.

Further, the thermistor 21 for the carburetor for controlling the temperature of the carburetor 8, the room temperature thermistor 22 for detecting and controlling the temperature in the room, the flame lot 12 for monitoring the combustion state in the burner 3, and the rotation speed of the burner motor 10. Rotation detector to detect
Sensors such as 42 are installed.

Such control is performed by a control circuit 18 based on a microcomputer (hereinafter, referred to as a microcomputer) 23. The signals of various sensors are used to control changes in the environment, combustion, display of time, temperature and abnormal conditions, It gives warnings such as buzzers and stops operation.

FIG. 6 shows an embodiment of the inside of the display / operation unit 20, which comprises a display portion 24 and an operation portion 25. In the display portion 24, an operation lamp 26 that is lit during operation, a reset lamp 27 that lights when the combustion is stopped in an abnormal condition and the post purge is entered (hereinafter referred to as reset drop), a ventilation lamp 28 that lights when oxygen is deficient, and a fixed tank Refueling lamp 29 that lights up when the oil inside is below a certain level, timer lamp 30 when the good morning timer is set, water detection lamp 31 that lights up with a signal from the float switch when water enters the tank, etc. There is. Reference numeral 32 denotes a temperature display lamp, which is configured by arranging light emitting diodes in series. The light is a set temperature, and the blinking is a room temperature. Also,
33 is a clock display, which is adapted to display "hour" and "minute".

The operation part 25 includes a temperature setting button “up” 34, “down” 35, a timer time slide switch 36,
There are a “hour” setting button 37, a “minute” setting button 38, a timer setting button 39, a driving button 40, and the like.

The operation of this circuit will be described mainly with reference to FIG. When an AC voltage is applied to the power supply 13, a power transformer 16 between points a and d
DC voltage is generated in the constant voltage circuit 17 through the
The control circuit 18 whose main function is to start the operation.

First, the carburetor thermistor 21 detects the temperature of the carburetor 8, and when the contact 45 is operated to raise the temperature to a temperature suitable for vaporizing kerosene, the relay contact 15 is closed and a voltage is applied to the electromagnetic pump 9 and the oscillation circuit 19. Then, when a signal from the microcomputer is given to this, the pump coil is excited and jets kerosene into the vaporizer 8. At this time, the igniter 41 also starts to operate, and the ignition electrode 11 ignites the flame mouth 3a of the carburetor 8 shown in FIG. Of course, the burner motor 10 has already started to rotate due to prepurge. In this case, the operation lamp 26 lights up in the display portion 24, the temperature display lamp 32 displays the set temperature (lighting) and the room temperature (blinking), and the clock lamp 33 displays the current time.

Moreover, the motor 5 for blowing air has already blown the indoor air A into the fan 4
As a result, the warm air C is discharged from the louver 7 into the room because it is sent into the burner 3.

In such a state, if for some reason, for example, burner motor 10 is disconnected or external noise is generated, the rotation detector
When the signal of 42 disappears, the microcomputer 23 feels abnormal and gives an instruction to stop the combustion sequence. In this case, the operation of the electromagnetic pump 9 is immediately stopped so that the contact 15 is opened, and the burner motor 10 and the blower motor 5 are put into the post purge for continuing the rotation for a predetermined time.

As a display, the operation lamp 26 is turned off and the reset lamp 27 is turned on. Further, the temperature display lamp 32 is turned off, but the clock display lamp 33 displays the reset mode numerical value "08" indicating the stop of the burner motor, while the time display lamp has been displayed.

Therefore, the user or service person knows that "08" is an abnormality related to the stop of the burner motor 10. When inspecting, the cause of the reset drop of the system is checked to quickly find the defective portion, improve the efficiency of repair time, or serve to transmit correct information.

When expressing such defects numerically, depending on the cause,
Several types are set.

“01” …… If there is a momentary power failure and there is a momentary power failure for 0.1 seconds or more and the power is re-energized, the reset will be lost.

"03": This is a combustion failure detection and works when the current value of flame lot 12 (hereinafter referred to as FR) is below a certain level.
Reset is designed to fall.

"04": Oxygen deficiency is detected, the amount of oxygen in the air or the burner air is reduced, and the FR current is above the misfire detection and below the normal value.

“06” …… This is a mode for immediately resetting and dropping in the event of vibration or an earthquake, and is also legally prescribed.

“07” …… When the oil in the fixed tank 9a has run out, the float switch 43 is attached to the oil surface of the electromagnetic pump 9 in the fixed tank 9a, and this signal keeps the oil surface below a certain value. A signal is sent to the control circuit 18 at the time of the lapse of time, and after a certain period of time elapses from this time, the reset signal is dropped.

“11” …… Detects water and detects the water level in the fixed tank 9a. When this water level exceeds a certain level, combustion is stopped immediately.

FIG. 4 shows the state of the reset drop portion of this flow chart, which starts with preheating, pre-purge, and igniter operation, and shifts to ignition operation and steady combustion.

Here, it is judged whether there is a power outage, and if it is not a power outage, then if there is a power outage, see if it is within 00.1 seconds and continue for 0.1 second or more. Indicator lamp and operation lamp are turned off → Reset lamp is turned on →
Enter the reset drop sequence of combustion stop → post purge → operation stop.

Next, if it is not a power failure, check the output of frame lot 12 to see if it is at the level of misfire detection, and if it has exceeded 1 second, display "03" → point C.

In the case of oxygen deficiency, if the FR voltage is lower than the above normal value and higher than the "03" level and continues for 10 seconds or more, "04" is displayed → Ventilation lamp is lit → Point C.

If there is an earthquake, check whether the anti-vibration device is 0.1 seconds or longer, and if it is longer than this, display "06" → point C.

The kerosene surface detects the OFF with the float switch 43, and this is 1
Refueling lamp blinks if it continues for seconds → If this continues for 1 hour or more, "07" is displayed → Point C.

Water detection of float switch 43 → 1 second has passed → "11" is displayed →
Water lamp lighting → C point.

The output from the rotation detector 42 disappears due to the rotation stop of the burner motor 10, etc. → "08" is displayed → point C.

In this way, in the case of control abnormalities, changes in return boundaries, abnormal external noises, etc., these are categorized and numerical indications are given along with alarms such as lamps and buzzers to stop combustion and wait for the next operation. There is. Therefore, the user sees the numerical value and the position of the display lamp and performs operation such as re-operation and refueling.

Types of reset drop (1) Immediate reset drop → Water detection "11",
Abnormal rotation of burner motor "08", ventilation reset "04" (2) Legal or for safety reasons, it will be reset immediately. → Automatic earthquake extinguisher operation "07", power failure recovery "01", etc. .

Problems to be Solved by the Invention Due to the above-described reset drop, for example, in a water heater, if water mixes in oil and operates even once, combustion remains stopped, and signal from external noise is generated. It is possible that the temperature of the entire hot water supply circuit drops and finally freezes up because the combustion is stopped when the reset error occurs. Further, in a warm air blower or the like, damage may occur due to freezing of foliage plants, and it is desired to prevent reset leaves from falling as much as possible.

Of course, since it is a burning appliance, compliance with laws and regulations and ensuring safety are absolutely necessary conditions, but the drawback is that everything is reset and dropped.

The present invention is to solve the above-mentioned conventional drawbacks,
By not restarting everything as it is after resetting, but restarting after resetting according to the content of the abnormality, safe and ideal combustion control is performed.

Means for Solving the Problems In order to solve the above problems, the present invention is directed to an abnormality detecting unit 101 for detecting an abnormality during combustion as shown in FIG. 1, and the abnormality content detected by the abnormality detecting unit 101. Is classified into at least a re-operation error and a non-re-operation error, and outputs a re-operation judgment command signal S2 in the case of the re-operation error, and a combustion stop signal S1 in the case of the non-re-operation error. Error content classification unit 102, a display unit that displays the content of the error in a numerical value that is easy for the user to understand, and if the restart operation determination command signal S2 from the abnormality content classification unit 102 is less than or equal to a predetermined number of times, Re-operation determination unit 103 that outputs an operation signal S3 and outputs a combustion stop signal S1 when the number of times is equal to or greater than the predetermined number, and a combustion stop signal S1 or an abnormality content classification from the re-operation signal S3 of the restart operation determination unit 103. Combustion stop signal from part 102 Perform combustion stopped based on S1, the re-run signal
Only when the combustion is stopped based on S3, the combustion control unit 104 that restarts after that is provided.

Effect of the Invention With the above-described configuration, when the combustion is stopped once the combustion is started, that is, the reset is dropped, the one that is unavoidable for legal reasons or safety from the cause is stopped as it is, but in other cases, it is restarted and operated. Then, if the cause of the reset drop is reproduced, the reset is dropped. If it is not reproduced, the combustion is restarted.

Therefore, in the past, a controller that has been treated as an abnormality does not feel abnormal because a controller that has been reset and dropped due to an input abnormal pulse or the like returns to normal. Therefore, not only the trouble in use is reduced, but also the maintenance in service is improved.

Embodiment An embodiment according to the present invention will be described below with reference to the drawings.

First, the following is a study of what is dangerous, reduces safety, and has legal problems by restarting in the conventional reset drop.

The reset of the automatic anti-earthquake fire extinguisher operation "06", the reset after power failure "01", etc. are absolutely not re-startable.

Regarding other reset dropouts, it is considered that there is no problem in restarting the drive and resetting it if the same phenomenon as that at the beginning still occurs, and shifting to normal operation otherwise. .

Therefore, as one embodiment, an outline of the flow chart of the present invention is shown in FIG. 2 in contrast to the conventional flow chart shown in FIG.

The pattern of transition to preheating → point B → prepurge → ignition operation → point C → steady combustion through point A in the middle of the sequence is the same as the conventional example. After this, the presence or absence of abnormality is detected,
If there is an abnormality, the abnormality content classification unit 102 classifies the abnormality content into those that cannot be restarted, those that can be restarted, and those that require continuous operation for a certain period of time.

In the case of the mode in which restarting is not possible, the point D is entered and the cause of combustion stop (reset drop) is displayed and the combustion is stopped.

On the other hand, for those that can be restarted, a restarting determination command signal is input from the abnormality content classification unit 102 to the restarting determination unit 103. Then, the re-operation determination unit 103 determines whether or not the re-operation judgment command signal is a predetermined number of times, for example, whether it is the first time or not, and if it is the first time, the point E is entered, the combustion is temporarily stopped, and the re-operation is instructed. After a restart signal is issued to stop the combustion operation for one minute, the sequence starts again from the preheating at point A. Then, the operation is restarted, the same abnormality is detected again, and when it is found that the restart operation determination command signal is the second time, the point D is entered, the cause of combustion stop (reset drop) is displayed, and then the combustion is stopped.

In the case of oil detection, the cause of combustion stop (reset drop) is displayed after 1 hour as usual, and the combustion is stopped. FIG. 3 is a detailed description of these operations for each mode.

In Fig. 3, from point A to steady combustion is exactly the same as in the conventional example of Fig. 4. After that, the mode classification operation is started, first the re-operation impossible mode is entered, and when a power failure or anti-earthquake is detected, a power failure occurs. If it is "01" in the case of seismic motion, and "06" is displayed in the case of anti-seismic movement, the point D is entered and combustion is stopped.

Next, the re-operable mode will be described. First, misfire detection is performed. For 1 second, check if the flame lot is at the misfire level, and if it is 1 second or longer, check whether the A flag is set among the flags in the microcomputer 44. If there is no A flag, this is judged to be the first time, the A flag is set, and the E point is reached. At point E, a re-operation signal is output to instruct re-operation after the combustion is once stopped, and after post-purge, the operation is restarted for a certain period of time and then enters point A to start re-operation. In some cases, point A may be entered shortly after post-purge, and this point may be modified by the system of the combustion appliance. After restarting through point E, check if the misfire occurs again. If the misfire continues for more than 1 second, check the A flag. If there is an A flag, delete the A flag and display the misfire "03". After that, the combustion is stopped at point D.

Next, if there is no misfire, check for oxygen deficiency detection.
If oxygen deficiency continues for 10 seconds, check for the B flag.
Subsequent operations are exactly the same as those for misfire detection. In the case of the second time, "04" is displayed and point D is reached.

Similarly, in the case of water detection, if it is 1 second or more, the display is “11” → point D.

The above is the case of re-operation, and depending on the device, reset due to other causes, that is, combustion stop may be considered.

When refueling is detected, it is checked for 1 second or longer, and if it is 1 second or longer, an E flag is set, and in this case, point C is entered to continue combustion. From the second time, if this continues for one hour, the E flag will be erased and "07" will be displayed to enter point D to stop combustion.

In the case of oil detection, if the oil level falls close to the operating point of the float switch, even a slight vibration will easily turn it off, and noise may cause a malfunction. But,
If oil is injected once again, it will return to point F within 1 hour of detection, so at this point malfunctions can be largely prevented.

In addition, from the point D, combustion stop → operation lamp extinguishment → reset lamp lighting → post-purge → operation stop is the same as the conventional one.

The structure of the main body and the structure of the burner are the same as those shown in FIGS. 7 and 8, and the control circuit is completely new because the microcomputer 23 executes the sequence shown in FIG. 2 as shown in FIG. It has the same structure as the conventional one except that it has functions.

Further, the display unit and the operation unit can be the same as those of the conventional example shown in FIG.

EFFECTS OF THE INVENTION According to the present invention, as is apparent from the above-mentioned embodiments, even if the combustion is stopped due to an abnormality during the combustion after the combustion is once started, for safety and legal reset drop, Properly stop combustion as it is and restart the operation as much as possible in case of other reset drop, so it is possible to reduce troubles between customers and dealers due to unnecessary reset drop, and also wasteful maintenance labor. Can be reduced to In particular, it not only has a great effect on solving troubles on the service side, but it also causes trouble for the user if reset is left in the middle of the night, but such cases are extremely reduced, and usability is greatly improved. Also,
In hot water heaters, etc., there is less chance that hot water will not come out as it is reset and freezes, and equipment will not be destroyed due to freezing, and it will not adversely affect the human body. It will also be less likely that it will freeze and become unusable.

[Brief description of drawings]

FIG. 1 is a block diagram of a combustion control device according to an embodiment of the present invention, FIG. 2 is an explanatory view of the flowchart, FIG. 3 is a detailed explanatory view of the flowchart, and FIG. 4 is an embodiment of a conventional example. 5 is an explanatory view of a flow chart in FIG. 5, FIG. 5 is a circuit diagram of a warm air blower according to the present invention and a conventional example, FIG. 6 is an explanatory view of the operation / display unit, FIG. 7 is a sectional view of the same, and FIG. 8 is a burner portion thereof. It is a structure explanatory view. 101 ... Abnormality detection section, 102 ... Abnormal content classification section, 103 ...
Re-operation determination unit, 104 ... Combustion control unit.

Claims (1)

[Claims] 1. An abnormality detection unit for detecting an abnormality during combustion, and the abnormality content detected by the abnormality detection unit is classified into at least a restartable abnormality and a non-restartable abnormality, and the restartable operation is possible. In the case of an abnormality, a restart operation determination command signal is output, and in the case of the failure that cannot be restarted, an abnormality content classification unit that outputs a combustion stop signal, a display unit that displays the abnormality content in a user-friendly numerical value, and If the number of restart command signals from the abnormality content classification unit is less than a predetermined number, a restart signal is output, and if it is more than the predetermined number, a combustion stop signal is output, and a restart determination unit Combustion is stopped based on the restart signal or combustion stop signal from the operation determination unit or the combustion stop signal from the abnormality content classification unit, and then restarted only if the combustion stop was performed based on the restart signal. Combustion control system consisting of a combustion control section that.