JP2835124B2 - Combustion control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a combustion control device having a plurality of burners.

(Prior Art) In a combustion control device having a plurality of burners, for example, a combustion control device of a kerosene-type stove having two burners of a main burner and a sub-burner, control in a low combustion amount region uses only a sub-burner. Control in the high combustion volume range
It is supposed to use both main burners.

Specifically, kerosene supplied by the operation of the electromagnetic pump is vaporized by a vaporizer, the vaporized gas is supplied to each burner, and the opening and closing of the supply path of the vaporized gas to each burner is controlled by an electromagnetic solenoid. It has become.
In the case of low combustion control, only one of the electromagnetic solenoids operates to supply only vaporized gas to the sub-burner.In this state, the operating frequency of the electromagnetic pump is varied to adjust the flow rate of kerosene for combustion. When controlling the amount of combustion and controlling the high combustion amount, both electromagnetic solenoids operate to supply vaporized gas to both the sub and main burners.In this state, the operating frequency of the electromagnetic pump is varied. Thus, the combustion amount is controlled by adjusting the flow rate of kerosene.

Conventionally, in such a combustion control device, for example, a flame rod is attached only to the sub-burner to detect a flame current,
A device for determining normal or abnormal combustion is known. For example, in Japanese Utility Model Publication No. Sho 62-18829, even when a flame rod is attached only to the sub-burner, the current value of the flame current is determined when the sub-burner alone is burned and when both the sub-burner and the main burner are burned. Are different,
The judgment level is varied between when only the sub-burner is used and when both the sub-burner and the main burner are used.

(Problems to be Solved by the Invention) However, when a frame rod is attached only to such a sub-burner, the sub-burner side is normal even if a large amount of tar or the like adheres to the nozzle on the main burner side and abnormal combustion occurs in the main burner. If so, the flame current detected via the frame rod is often determined to be normal, and the monitoring function is insufficient.

In addition, when only the sub-burner is operating, the pressure of the vaporized gas is low due to the small amount of combustion, so it takes a long time until the blow-off phenomenon occurs in the flame when an abnormality occurs, making it impossible to quickly detect abnormalities. In this respect, the monitoring function was still insufficient.

Therefore, the present invention is to provide a function control device that uses a plurality of burners and can sufficiently enhance the flame monitoring function of the burners.

[Configuration of the Invention] (Means for Solving the Problems) The present invention provides a combustion control device that includes a plurality of burners and selectively performs one or more of the burners according to a combustion amount. Flame current detecting means for detecting a flame current; and when at least one flame current of each burner detected by the detecting means is equal to or lower than a first predetermined level, all the burners are detected based on the maximum combustion amount. A control unit for performing a combustion operation; and a combustion abnormality is determined when at least one flame current detected by the detection unit is lower than a second predetermined level in a state where all the burners are performing the combustion operation by the control unit. This is provided with a judging means for performing the judgment.

(Operation) In the present invention having such a configuration, when the flame current detecting means detects that at least one of the flame currents of each burner is lower than the first specified level, the flame current is detected based on the maximum combustion amount. Then, all the burners are burned. In this state, the flame current of each burner is detected again, and if at least one of the flame currents is lower than the second specified level, the abnormal combustion is determined only at that time.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the present invention is applied to a kerosene-type stove combustion control device.

As shown in FIG. 1, a vaporizer heater 3 for heating a vaporizer is connected to a commercial AC power supply 1 via a first bidirectional three-terminal thyristor 2. The first thyristor 2
Gate, between terminals connected photothyristor 4 ₁ of the first photo-coupler 4 through the resistor 5.

An AC input terminal of a first diode bridge circuit 7 is connected to the power supply 1 via a normally open contact 6m of a first relay 6. A first electromagnetic solenoid 8 that controls opening and closing of a vaporized gas supply path to a sub-burner described later is connected to a rectification output terminal of the first diode bridge circuit 7.

The AC input terminal of the second diode bridge circuit 10 is connected to the current 1 via a normally open contact 6m of the first relay 6 and a normally open contact 9m of the second relay 9 in series. A second electromagnetic solenoid 11 that controls opening and closing of a vaporized gas supply path to a main burner, which will be described later, is connected to a rectification output terminal of the second diode bridge circuit 10.

An ignition heater 14 is connected to the power supply 1 via a normally closed contact 12m of a third relay 12 and a normally closed contact 13t of a switching contact 13t of a fourth relay 13 in series.
A convection blower 16 is connected to the normally open side of the 13 switching contacts 13t and the resistor 15 in series. A second bidirectional three-terminal thyristor 17 is connected to the resistor 15 in parallel. The second thyristor 17 has a second
Photo thyristor 18 ₁ of the photo-coupler 18 is connected.

Further, a control circuit section 19 containing a microcomputer or the like is connected to the power supply 1.

The control circuit unit 19 includes the first to fourth relays 6, 9, 1
2,13, the first, light-emitting diodes 4 ₂ of the second photocoupler 4,18, 18 _2, raising switch 20 to raise the set temperature,
Lowering switch 21 for lowering the set temperature, vaporizer thermistor 22 for detecting vaporizer temperature, room temperature thermistor 23 for detecting room temperature, electromagnetic pump 24 for supplying kerosene from the kerosene tank side to the vaporizer, operation switch 25, fifth switch Are connected to the relay 26 and the alarm device 27, respectively.

The fifth relay 26 controls the switching of the switching contact 26t. The first relay 26 detects the flame current of the main burner 28 through the normally open side of the switching contact 26t. A frame rod 29 is connected, and a second frame rod 31 for detecting a flame current of the sub-burner 30 is connected via a normally closed side of the switching contact 26t.

FIG. 2 is a perspective view showing the structure of the burner section. The main burner 28 and the sub-burner 30 are arranged with their tip portions slightly inclined inward. The two burners 28, 30 are provided with vaporized gas inlets 32, 33 on the lower front side, and the respective inlets 32, 33 are provided.
Nozzles 34 and 35 are arranged to face 33. The vaporizer 36 is arranged side by side with the nozzles 34 and 35 connected in series. The vaporizer 36 is provided with the vaporizer heater 3.

Then, a pipe is provided to the vaporizer 36 by the electromagnetic pump 24.
Kerosene is supplied via 37. Further, the vaporizer 36 is provided with the vaporizer thermistor 22.

In each of the nozzles 34 and 35, a needle shaft for controlling opening and closing of a supply path of a vaporized gas to each of the burners 28 and 30 is provided so as to be able to advance and retreat, and the needle shaft is energized and de-energized by the electromagnetic solenoids 11 and 8. The forward / backward operation is performed by the energizing operation.

The control circuit section 19 is set to perform the control shown in FIGS. 3 and 4.

When the power is turned on, first, the input processing of the set temperature set by operating the switches 20 and 21 and the room temperature thermistor 23 are performed.
The input processing of the room temperature detected by is performed.

Then check the combustion flag at S _1, the first thyristor operates the first photo-coupler 4 if it is "0" 2
To conduct electricity to the carburetor heater 3. Thus, the vaporizer 36 is heated, and its temperature is determined by the vaporizer thermistor.
It will be detected at 22. When the temperature of the vaporizer 36 reaches the first set temperature, the third relay 12 is operated to close the normally open contact 12m and operate the ignition heater 14.

Thereafter, when the temperature of the vaporizer 36 reaches a second set temperature higher than the first set temperature, the completion of preheating is determined, the combustion flag is set to "1", and the electromagnetic pump 24 is operated.
And controlling the kerosene flow rate of the electromagnetic pump 24 so that the amount of combustion of 15 stages of the seventh combustion rate Q ₇ of Q ₁ to Q ₁₅ in this case.

Further, the first relay 6 is operated to close the normally closed contact 6m, and the first electromagnetic solenoid 8 is operated. Thus, first, the supply of the vaporized gas to the sub-burner 31 is started. Then, when a certain time elapses, the fourth relay 13 is operated to switch the switching contact 13t to the normally open side to stop the operation of the ignition heater 14 and to operate the convection blower 16.

Further, when a predetermined time elapses, the second relay 9 is operated to close the normally closed contact 9m, and the second electromagnetic solenoid 11 is operated. After the combustion of the sub-burner 31 is sufficiently stabilized, the supply of the vaporized gas to the main burner 28 is started, and the main burner 28 is ignited by the sub-burner 31.

 Thus, the combustion operation is started.

Note that if the flag is set to "1" in the combustion flag check, the above control is passed.

A check of the T ₁ F flag at S ₂ is followed. Then followed if T ₁ F flag = 0 checks whether the elapsed time T ₁ from the time of completion of preheating, the time T ₁ has elapsed, T ₁
Set the F flag to “1” and clear the FL timer before starting. Then, the routine returns to the set temperature input.

Also, if T ₁ F flag = 1, the combustion quantity at S ₃ is checked whether or not it is more than Q _8. And combustion amount ≧ Q ₈
If is ON the second solenoid 11, also followed if combustion rate <Q ₈ checks whether combustion amount at S ₄ is in Q ₅ below, the combustion amount ≦ Q ₅ If there is, the second electromagnetic solenoid 11 is turned off.

If Q ₈ > burning quantity> Q ₅ , the second electromagnetic solenoid 11
The operation state of is kept as it is.

Followed by checking whether the second electromagnetic solenoid 11 at S ₅ is in the OFF state, the fifth relay if OFF state 2
Turn off 6 and sub burner with 2nd frame rod 31
Input the flame current from 30.

If the second electromagnetic solenoid 11 is in the ON state,
Fifth relay 26 is checked whether it is ON at S _6. If the fifth relay 26 is in the OFF state, the flame current from the sub-burner 30 is input by the second frame rod 31. If the fifth relay 26 is in the ON state, the main flame is supplied by the first frame rod 29. Input flame current from 28.

The FL timer is checked whether or not the counted time T ₃ or more at S ₇ is followed when you enter the flame current from the sub-burner 30, the fifth If the counting time T ₃ or more
The relay 26 is turned ON and the FL timer is cleared. Also time T ₃
If this has not been counted, this processing is passed.

The FL timer is checked whether or not the counted time T ₂ or in subsequently S ₈ when you enter the flame current from the main burner 28, the fifth If the counting time T ₂ or more
The relay 26 is turned off and the FL timer is cleared. Also time T
_{If 2} has not been counted, this process is passed.

"1" followed fifth relay 26 at S ₉ checks whether the ON state, M flag at Then S ₁₀ if the ON state
Check if it is set to. And checks whether the flag in the M flag = 1 unless further S ₁₁ is set to "1". The P flag is not 1 followed by flame current of the main burner 28 at S ₁₂ it is checked whether the first prescribed level I _F1 below. And, if the flame current is below the first prescribed level I _F1 sets the M flag to "1", and stores the current combustion quantity data in the memory, the combustion amount is set to the maximum combustion amount of Q ₁₅ Routine Is returned to the set temperature input process. The flame current is at the specified level.
Return the routine to the set temperature input process performed an alarm stop control is greater than I _F1.

Performs the following processing of FIG. 4 the P flag = 1 is judged at check of the S _11.

Flame current of the main burner 28 at S ₁₃ is followed with the M flag = 1 is judged at check of the S ₁₀ it is checked whether the second prescribed level I _F2 more. The flame current to operate the alarm device 27 is lower than the second prescribed level I _F2. If the flame current is equal to or higher than the second specified level _IF2 , the combustion amount stored in the memory is increased by one step, the M flag is set to "0", and the routine returns to the set temperature input processing.

Wherein the OFF state of the check in the fifth relay 26 S ₉ is determined, followed by whether P flag in S ₁₄ is set to "1" is checked. And the P flag =
When 1 is determined, the following processing in FIG. 4 is performed. Also P
Flag = 1 if not followed by the M flag in the S ₁₅ is "1"
It is checked whether it is set to. And M
When the flag = 1 is determined to shift the check S ₁₃ described above routine. If the M flag is not 1, the fourth
The following processing in the figure is performed.

Sub-burner in the fourth process in view first S ₁₆ 30
It is checked whether the flame current is equal to or lower than the first specified level _IF3 . And, if the flame current is first prescribed level I _F3 or less sets the P flag to "1", and stores the current combustion quantity data in the memory, followed by the second electromagnetic solenoid 11 at S ₁₇ and the ON Check if it is in status. If it is not in the ON state, the second electromagnetic solenoid 11 is turned on. If the second electromagnetic solenoid 11 is in the ON state, the state is kept as it is. Then return the routine to the set temperature input process the combustion amount is set to the maximum combustion amount of Q _15. Also it calculates the combustion amount and a set temperature and the room temperature by performing an alarm stop control is greater than the flame current is defined level I _F3, sets a new combustion amount based on the calculation result. Then, the routine returns to the set temperature input processing.

Processing in FIG. 4 checks whether the flame current sub-burner 30 in S ₁₈ is a second prescribed level I _F4 above. If the flame current is equal to or higher than the second specified level _IF4 , the combustion amount stored in the memory is increased by one step,
Set the P flag to “0”. Then, the routine returns to the set temperature input processing.

The flame current to operate the alarm device 27 is lower than the second prescribed level I _F4.

In the first prescribed level I _F3 5μA, Q ₄ ~Q ₈ in the combustion amount Q ₁ to Q ₃ as is shown by the dotted line in FIG. 5 for the flame current determination of sub-burner 30 in the combustion Is 7 μA when only the sub-burner 30 is used, and changes to 10 μA when the combustion is both sub and main.
The first specified level I _F1 for flame current determination of the main burner 28 is changed to 15μA in 10μA, Q ₁₃ ~Q ₁₅ in the combustion amount Q ₅ to Q ₁₂ as indicated by a dotted line in FIG. 5 It is supposed to.

The both second prescribed level I _F2 for flame current determination of the second prescribed level I _F4 and the main burner 28 for the flame current determination of sub-burner 30 in the, as shown by a chain line in FIG. 5 It is set to 20 μA.

In FIG. 5, a region indicated by hatching a indicates a flame current region during normal combustion of the sub-burner, and a region indicated by hatching b indicates a flame current region during normal combustion of the main burner.

In the present embodiment having such a configuration, the fifth relay 26 alternately turns ON and OFF at a predetermined cycle by the operation of the FL timer during combustion. When the fifth relay 26 is OFF, the second frame rod 31 is connected to the control circuit unit 19, and when the fifth relay 26 is ON, the first frame rod 29 is connected to the control circuit unit 19. .

For example, the first electromagnetic solenoid 8 if the combustion occurs operates now combustion rate Q ₉ is of course, also ON the second solenoid 11
Therefore, both the main burner 28 and the sub-burner 30 are performing a combustion operation. In this state, the fifth relay 26
N, OFF operation detects the flame current of the main burner 28 through the first frame rod 29, and the second frame rod
The flame current of the sub-burner 30 is detected via 31.

The main combustion operation is continued greater than I _F3 large, the flame current sub-burner 30 than the flame current I _F1 of the main burner 28 if none of the burners sub long as combustion occurs operate normally .

The combustion rate calculated from the relationship between the set temperature and the room temperature in this state operates both the combustion of sub-burner 30 and the main burner 28 until Q ₅ below, if the combustion amount calculated is Q ₅ below When the temperature drops, the combustion operation of the main burner 30 is stopped.

The afterburning operation of the main burner 28 is not performed once to the combustion amount then the mode changes to the combustion operation of the sub-burner 30 alone is calculated from the relationship between the set temperature and the room temperature is equal to or greater than Q _8.

This prevents the main burner 28 from burning or stopping frequently.

For example, if an abnormality occurs in the combustion of the sub-burner 30 due to any cause such as oxygen deficiency or tar clogging while only the sub-burner 30 is performing the combustion operation, the flame current detected via the second frame rod 31 is reduced to a second value. Standard level I of 1
_F3 or less. At this time, the second electromagnetic solenoid 11
The combustion amount is set to the maximum combustion amount of Q ₁₅ are turned ON, sub-burner 3
The combustion operation is started using both 0 and the main burner 28. In this state, the flame current is detected again via the second frame rod 31, and the flame current is detected at the second specified level.
Compare with _IF4 .

And if the flame current is smaller than the second prescribed level I _F4 are alarm is determined that the lack of oxygen such serious abnormality occurs. But the flame current is one step is up combustion amount until it is determined that the second prescribed level I if not less than the _F4 abnormal sub-burner 30 of what the like is not such a serious abnormality hypoxia occurred Continue the combustion operation.

As described above, when the flame current is reduced while only the sub-burner 30 is being used, the burner is once burned at the maximum combustion amount using both burners, and the flame current is detected again to make a final determination. The flame current can be detected by increasing the pressure of the vaporized gas, so that the blow-off phenomenon occurs quickly and the abnormality can be quickly detected.

Further, for example, when an abnormality occurs in the main burner 28 when both the sub-burner 30 and the main burner 28 are performing the combustion operation, the first relay 26 is turned on via the first frame rod 29 when the fifth relay 26 is ON. Since the occurrence of the abnormality can be detected by the detected flame current, the abnormality of the main burner 28 as well as the sub-burner 30 can be reliably detected.

As described above, since both the burners can reliably detect the abnormality and quickly detect the abnormality, the flame monitoring function of the burner can be sufficiently enhanced.

Since the first and second frame rods 29 and 31 are switched by the fifth relay 26 and the flame current from each frame rod 29 and 31 is input to the common terminal for the control circuit unit 19,
The means for detecting an abnormality by detecting the flame current can be provided in common for both the main and sub burners, thereby improving the economic efficiency.

In the above embodiment, the present invention is applied to a combustion control device of a kerosene-type stove. However, the present invention is not limited to this, and can be applied to a combustion control device of another combustor.

[Effects of the Invention] As described above in detail, according to the present invention, it is possible to provide a combustion control device that uses a plurality of burners and can sufficiently enhance the flame monitoring function of the burners.

[Brief description of the drawings]

1 is a circuit diagram, FIG. 2 is a perspective view of a burner unit, FIGS. 3 and 4 are flowcharts showing combustion control by a control circuit unit, FIG. 5 is a graph showing the relationship between the flame current during normal combustion of both the main and sub burners and the prescribed level for determining abnormality. 6,9,12,13,26 …… Relay, 8,11… Electromagnetic solenoid, 19 …… Control circuit part, 24 …… Electromagnetic pump, 28 …… Main burner, 30 …… Sub burner, 29,31 …… Frame rod.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23N 5/02-5/12 F23N 5/24

Claims (1)

(57) [Claims] 1. A combustion control device comprising a plurality of burners and selectively burning one or more of said burners in accordance with a combustion amount, wherein a flame current detecting means for detecting a flame current of each burner; When at least one flame current of each burner detected by the detection means is equal to or less than a first predetermined level, control means for burning all the burners under the maximum combustion amount, and the control means A determination means is provided for determining a combustion abnormality when at least one flame current detected by the detection means is lower than a second predetermined level in a state where all the burners are performing a combustion operation. Combustion control device.