JP4542049B2 - Combustion control device - Google Patents

Description

  The present invention relates to a combustion control device such as a heater or a hot water heater that supplies fuel oil by an electromagnetic pump.

Conventionally, in this type, the amount of fuel oil supplied by controlling the plunger in the electromagnetic pump is controlled by adjusting the driving frequency and on-time of the voltage applied to the electromagnetic pump for fuel supply. .
By the way, since the plunger in the electromagnetic pump is driven intermittently, the fuel supplied into the carburetor from the fuel outlet becomes pulsating, and the vaporized gas in the carburetor also pulsates and burns. There has been a problem of pulsating combustion that causes increased sound and poor combustion.
Therefore, in order to prevent the pulsating gas from pulsating, the portion of the vaporizer facing the fuel jet outlet is a coating with a small vaporization promoting effect, and the portion surrounding the fuel jet outlet is a coating with a large vaporization promoting effect. By doing so, the vaporization of the fuel is smoothed and the occurrence of pulsation combustion is prevented. (See Patent Document 1.)
JP-A-6-180107

By the way, with this conventional one, a paint whose surface is roughened is used so that the effect of promoting vaporization of the paint around the portion facing the fuel jet outlet is increased, but if it becomes too rough, there will be problems with ignitability and fire extinguishing properties. Or the combustion range cannot be increased.

  The present invention focuses on this point and solves the above problems. In claim 1, a vaporizing cylinder provided with a heater, an electromagnetic pump for pumping fuel oil to the vaporizing cylinder, and supplying combustion air to the vaporizing cylinder A combustion fan, ignition means for igniting an air-fuel mixture in which vaporized gas of fuel oil and combustion air are mixed in the vaporization cylinder, and a drive circuit for supplying a drive voltage to the electromagnetic pump at a predetermined drive frequency and a predetermined drive ON time And a control unit that controls the heater, the electromagnetic pump, the combustion fan, the ignition means, and the drive circuit to perform the combustion operation, wherein the control unit includes a low-frequency drive frequency, Ignition mode consisting of low and medium thermal power with medium driving ON time, large thermal power with medium frequency driving frequency and long driving ON time, low thermal power with high frequency driving frequency and short driving ON time, and low frequency It has a stable mode consisting of medium thermal power with dynamic frequency and medium drive ON time, and large thermal power with medium frequency drive frequency and long drive ON time. After ignition in ignition mode at the time of ignition and after combustion is stabilized in ignition mode The combustion is performed by switching to the stable mode.

  According to a second aspect of the present invention, a vaporizing cylinder provided with a heater, an electromagnetic pump that pumps fuel oil to the vaporizing cylinder, a combustion fan that supplies combustion air to the vaporizing cylinder, and vaporized gas and combustion of fuel oil in the vaporizing cylinder Ignition means for igniting an air-fuel mixture, a drive circuit for supplying a drive voltage to the electromagnetic pump at a predetermined drive frequency and a predetermined drive ON time, the heater, an electromagnetic pump, a combustion fan, and an ignition means And a control unit that controls the drive circuit and performs a combustion operation, the control unit includes a plurality of low-power to medium-heat powers based on a plurality of low-frequency drive frequencies and medium drive ON times. Ignition mode consisting of a low and medium thermal power zone having a plurality of thermal powers, a plurality of medium frequency driving frequencies and a large thermal power zone having a plurality of thermal powers larger than the low and medium thermal powers due to the long drive ON time, and a plurality of high frequencies A low thermal power zone having a plurality of thermal powers according to a driving frequency and a short driving ON time; a plurality of medium thermal power zones having a plurality of thermal powers larger than a low thermal power by a low frequency driving frequency and a middle driving ON time; It is equipped with a stable mode consisting of a large thermal power zone having a plurality of thermal powers larger than the thermal power of the medium thermal power during the medium frequency driving frequency and the long driving ON time. After burning with a larger thermal power in the medium thermal power zone, when the thermal power drops and reaches a thermal power equal to the largest thermal power in the low thermal power zone of the stable mode, the magnitude of the thermal power remains as it is from the ignition mode The combustion is performed by switching to the stable mode.

  Further, in claim 3, when the heating power is reduced in the ignition mode and becomes equal to the largest heating power in the low heating power zone in the stable mode, the combustion is continued for a predetermined time in that state. The ignition mode is switched to the stable mode.

  According to the first aspect of the present invention, ignition is performed in an ignition mode including a low and medium heating power with a low driving frequency and a medium driving ON time, and a large heating power with a medium driving frequency and a long driving ON time. After combustion stabilizes in the mode, low thermal power due to high frequency drive frequency and short drive ON time, medium thermal power due to low frequency drive frequency and medium drive ON time, large frequency due to medium frequency drive frequency and long drive ON time By switching to a stable mode consisting of thermal power and performing combustion, the electromagnetic pump is driven and controlled in an ignition mode with a longer drive ON time at a lower drive frequency relative to the magnitude of the thermal power at the time of ignition. In a state where the temperature of the burner head is low and pulsation is likely to occur, the vaporized gas is prevented from becoming pulsating.

  Also, during ignition, the drive ON time does not switch at the medium drive ON time, but becomes low to medium heating power, so the drive ON time is switched during ignition when the temperature of the vaporizing cylinder and burner head is low and pulsation is likely to occur. It can prevent the flame from becoming unstable.

  Furthermore, after the combustion is stabilized in the ignition mode, by switching to the stable mode and performing the combustion, the temperature of the vaporizing cylinder and the burner head rises and stabilizes until switching to the stable mode, and a short drive ON at a high drive frequency Even if a small firepower is applied in time, the flame does not become unstable and prevents pulsating combustion.

  According to the second aspect of the present invention, a plurality of low and medium thermal power zones having a plurality of low power to medium heat power by a plurality of low frequency drive frequencies and medium drive ON times, a plurality of medium frequency drive frequencies and long drive ON times. Ignition mode consisting of a large thermal power zone having a plurality of thermal powers larger than a low-medium thermal power, a plurality of low thermal power zones having a plurality of thermal powers with a high frequency drive frequency and short drive ON time, and a plurality of low thermal power zones Medium thermal power belt with multiple thermal power greater than low thermal power due to frequency drive frequency and medium drive ON time, and multiple thermal power greater than medium thermal power with multiple medium frequency drive frequency and long drive ON time It has a stable mode consisting of a large thermal power zone, and when it is ignited, it is ignited in the middle thermal power zone of the ignition mode, and after burning from that thermal power with a larger thermal power in the middle thermal power zone, the thermal power is lowered and lowered In addition to the effect of claim 1, when the thermal power is equal to the largest thermal power in the low thermal power zone of the mode, the combustion power is switched from the ignition mode to the stable mode without changing the size of the thermal power. By increasing the heating power after ignition one step higher than that at the time of ignition, the temperature of the vaporizing cylinder and the burner head can be increased more quickly and stabilized.

When igniting in the medium thermal power zone of ignition mode at the time of ignition, after burning with that thermal power one step larger than that thermal power, when the thermal power falls and becomes the thermal power equal to the largest thermal power in the low thermal power zone of the stable mode, By switching from the ignition mode to the stable mode and performing combustion while keeping the magnitude of the thermal power as it is, the temperature of the vaporizing cylinder and the burner head rises and stabilizes in the meantime, and the drive frequency is increased and the drive ON time is shortened. Even if the combustion mode is switched to the stable mode, pulsation combustion can be prevented.

  Further, according to claim 3, when the heating power is lowered in the ignition mode and becomes equal to the largest heating power in the low heating power zone in the stable mode, the combustion is performed for a predetermined time in that state. After continuing, when switching from ignition mode to stable mode, when switching from ignition mode to stable mode, there is a large frequency difference, and flame lift and red fire are likely to occur, but while continuing combustion for a predetermined time In addition, the rotation speed of the combustion fan is stabilized, and the switching of the combustion fan speed is performed in a stable state, thereby preventing the occurrence of flame lift and red fire.

Next, a combustion control apparatus according to the present invention will be described in the form shown in the drawings.
Next, the vaporizing burner apparatus according to the present invention will be described in the form shown in the drawings. Reference numeral 1 denotes a vaporizing cylinder having a heater 2, which is a mixture of fuel sprayed from a spray nozzle 4 pumped from an electromagnetic pump 3 and combustion air supplied by a combustion fan 5, and is heated by the heat of the heater 2. A gas mixture is formed in the vaporizing cylinder 1.

  An ignition means 6 ignites the mixed gas ejected from a plurality of flame ports 8 formed in the burner head 7 by spark discharge of an igniter, thereby forming a flame.

  A burner head ring 9 is provided outside the flame opening 8 and heats the combustion heat of the flame back to the vaporizing cylinder 1 so that the vaporizing cylinder 1 can be heated to a vaporizable temperature without being heated by the heater 2. To keep.

A control unit 10 controls the heater 2, the combustion fan 5, the ignition means 6, and the drive circuit 11. The drive circuit 11 controls the drive frequency of the drive voltage applied to the electromagnetic pump 3 and the drive thereof. The heating power is changed by adjusting the ON time, and the rotational speed of the combustion fan 5 is controlled so that the combustion air amount matches the heating power.
Also, when the thermal power is changed, when the thermal power is further changed, the thermal power is changed only after a certain time has elapsed, and when the timer means 12 finishes counting the delay time at that time, the thermal power is changed. The firepower will be changed later.

Next, the operation of one embodiment of the present invention will be described.
As shown in FIG. 3, first, when an operation switch (not shown) is pressed (S1), the control unit 10 sets the combustion mode to the ignition mode. (S2)
Then, each driving frequency to be applied to the electromagnetic pump 3 from one lamp with the minimum heating power to six lamps with the maximum heating power in the ignition mode and its driving ON time are set. (S3)

The driving frequency of each thermal power and the driving ON time are 6 msec at 6 Hz for 6 lamps at 2 Hz, 6 msec at 8 Hz for 3 lamps, 6 msec at 12 Hz for 3 lamps, and 15 Hz for 4 lamps as described in (S3). At 6 msec, 4 lamps are set to 7.2 msec at 17 Hz, and 5 lamps are set to 7.2 msec at 20 Hz, and 6 lamps are set to 7.2 msec at 23 Hz.
In addition, 4 lamps above and 4 lamps are the same 4 lamps as the thermal power, and in order to realize the thermal power, 4 lamps above is 17Hz and 7.2msec, 4 lamps below is 15Hz and 6msec drive frequency and drive ON This is done by combining time.

First, an ignition operation is performed with three medium-fired lights (S4). When ignition is confirmed (S5), the timer means 12 is operated to measure the delay time. (S6)
When a predetermined delay time is measured (S7), the heating power is changed from 3 to 4 lights to increase the heating power (S8), and the operation is continued. (S9)

  Here, the ignition operation is performed with three medium heating power lamps, which are suitable for stabilizing the ignitability and the combustion after ignition, and after a predetermined delay time has elapsed after ignition, The change to 4 lamps and the increase in the thermal power is a control for quickly raising the temperature of the vaporizing cylinder 1 and the burner head 7 and stabilizing it.

  Also, the ignition operation is performed in (S4), and if the ignition is not confirmed in (S5), the re-ignition operation is performed (S10). If the ignition is confirmed, the process proceeds to (S11) and (S6), and the ignition is confirmed. If not (S11), it is determined that an abnormality has occurred, the ignition operation is stopped, and the mode is switched to the error mode. (S12)

  When the operation is continued in (S9) and then the operation switch is turned off (S13), the combustion mode remains in the ignition mode and the operation is stopped (S14). Is set to a different heating power, or the heating power is changed according to the difference between the set temperature and room temperature in automatic operation (S15), the driving power and the driving ON time are changed to change the heating power by one step. (S16)

  When the thermal power is changed by one stage, the timer means 12 is operated to measure the delay time (S17), and when the predetermined delay time is measured (S18), the one-stage change of the thermal power is changed from three to two lights. When it is changed to (S19), after igniting with 3 medium-powered lights, increase the power from 3 to 4 lights, then reduce the power to 2 lights, then vaporize in the meantime The controller 10 determines that the pulsation combustion does not occur even if the combustion mode is switched to the stable mode in which the temperature of the cylinder 1 and the burner head 7 is sufficiently raised and stabilized, and the drive frequency is increased to shorten the drive ON time. Is for switching the combustion mode from the ignition mode to the stable mode. (S20)

  When it is confirmed that the combustion mode has been switched from the ignition mode to the stable mode (S21), each driving frequency applied to the electromagnetic pump 3 from one lamp with the minimum heating power to six lamps with the maximum heating power in the stable mode and the driving thereof. Set the ON time. (S22)

The driving frequency of each thermal power and the driving ON time are 4msec at 17Hz for 4 lamps for 2 lamps, 4msec for 24Hz for 3 lamps, and 4msec for 28Hz for 3 lamps, as described in (S22). 10 Hz, 6 msec for 4 lights, 6 msec for 12 Hz, 5 msec for 15 Hz, 17 mHz for 5 lights, 7.2 msec for 17 lights, and 7.2 msec for 23 lights for 6 lights.
The above three lamps and three lamps have the same three firepowers. To realize the firepower, the three lamps have a drive frequency of 10 Hz and 6 msec, and the three lamps have a drive frequency of 28 Hz and 4 msec. In the same way, 5 lamps above and 5 lamps are the same 5 lamps as firepower. To realize the firepower, 5 lamps above are 17 Hz and 7.2 msec. 5 lamps are below 15 Hz and 6 msec. The driving frequency is combined with the driving ON time.

Then, the current operation of the two thermal power lamps is changed from 6 msec at 8 Hz in the ignition mode to 4 msec at 24 Hz in the stable mode. (S23)
As a result, the drive frequency to the electromagnetic pump 3 is increased and the drive ON time is shortened even in the operation of the two lamps with the same thermal power, so the amount of fuel supplied from the electromagnetic pump 3 at a time becomes small and the electromagnetic pump per unit time. The number of times of supply of the fuel oil from 3 is increased, that is, a smaller amount of fuel oil is discharged, and the fuel oil to be vaporized is thereby constant, and the flame is stable even if the heat power is small.

  Then, the operation is continued (S24), and thereafter, when the operation switch is turned off (S25), the operation is stopped while the combustion mode remains in the stable mode (S26). Is set to a different thermal power or when the thermal power is changed by the difference between the set temperature and room temperature in automatic operation (S27), the thermal power is changed by one stage by changing the driving frequency and the driving ON time. (S28)

  When the heating power is changed by one stage, the timer means 12 is operated to measure the delay time (S29), and when the predetermined delay time is measured (S30), the operation proceeds to (S24) and the operation is continued.

  When switching from 6 msec at 10 Hz on 3 lamps to 4 msec at 28 Hz under 3 lamps in stable mode, the difference in frequency is large, and flame lift and red fire are likely to occur. By setting a delay time longer than the delay time and switching after the rotational speed of the combustion fan 5 is stabilized, the occurrence of flame lift and red fire may be further prevented.

  As described above, since the electromagnetic pump 3 is driven and controlled in the ignition mode in which the driving ON time is longer with a lower driving frequency with respect to the magnitude of the thermal power at the time of ignition, the temperature of the vaporizing cylinder 1 and the burner head 7 is low. In a state where pulsation is likely to occur, the vaporized gas is prevented from becoming pulsating.

  In addition, from the ignition mode in which a long drive ON time is set at a low drive frequency when the ignition operation is performed at a medium heat power and then decreased to a predetermined heat power, a short drive ON time is set at a high drive frequency below a predetermined heat power. By switching to the stable mode, the temperature of the vaporizing cylinder 1 and the burner head 7 rises and becomes stable before switching to the stable mode, and even if a small heating power with a short driving ON time is performed at a high driving frequency, This prevents the flame from becoming unstable and causing pulsating combustion.

  In addition, when switching from 6 msec at 10 Hz on 3 lamps to 4 msec at 28 Hz under 3 lamps in stable mode, the delay time is longer than the normal delay time and is switched after the rotation speed of the combustion fan 5 is stabilized. It can prevent the flame lift and red fire.

  Moreover, in the small thermal power of the stable mode, the electromagnetic pump 3 is driven at a high driving frequency and a short driving ON time, thereby reducing the amount of fuel per one time supplied from the electromagnetic pump 3 and per unit time. Since the fuel oil is easily vaporized even with a small thermal power and the vaporization is smoothed, the fuel oil can be stably burned without pulsating combustion even with a small thermal power.

The schematic block diagram of one Embodiment of this invention. The block diagram. The flowchart figure of the combustion control by the ignition mode from the start of the operation. The flowchart figure of the combustion control by the stable mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Evaporation cylinder 2 Heater 3 Electromagnetic pump 5 Combustion fan 6 Ignition means 10 Control part 11 Drive circuit

Claims (3)

A vaporizing cylinder provided with a heater, an electromagnetic pump that pumps fuel oil to the vaporizing cylinder, a combustion fan that supplies combustion air to the vaporizing cylinder, and a mixture in which the vaporized fuel gas and combustion air are mixed in the vaporizing cylinder Controlling ignition means for igniting, a driving circuit for supplying a driving voltage to the electromagnetic pump at a predetermined driving frequency and a predetermined driving ON time, the heater, the electromagnetic pump, the combustion fan, the ignition means, and the driving circuit. In the combustion control device comprising the control unit for performing the combustion operation, the control unit includes a low-frequency driving frequency and a low and medium heating power by a medium driving ON time, a medium frequency driving frequency and a long driving ON time. Ignition mode consisting of large thermal power, low thermal power due to high frequency driving frequency and short driving ON time, medium thermal power due to low frequency driving frequency and medium driving ON time, and medium frequency driving circumference Combustion control characterized by having a stable mode consisting of a large number of power and a large heating power with a long drive ON time, igniting in ignition mode at the time of ignition, and switching to stable mode after combustion is stabilized in ignition mode apparatus. A vaporizing cylinder provided with a heater, an electromagnetic pump that pumps fuel oil to the vaporizing cylinder, a combustion fan that supplies combustion air to the vaporizing cylinder, and a mixture in which the vaporized fuel gas and combustion air are mixed in the vaporizing cylinder Controlling ignition means for igniting, a driving circuit for supplying a driving voltage to the electromagnetic pump at a predetermined driving frequency and a predetermined driving ON time, the heater, the electromagnetic pump, the combustion fan, the ignition means, and the driving circuit. And a control unit for performing a combustion operation, wherein the control unit has a plurality of low-to-medium thermal powers with a plurality of low-frequency driving frequencies and a medium driving ON time. Ignition mode consisting of a thermal power zone, a large thermal power zone having a plurality of thermal powers larger than a low-medium thermal power due to a plurality of medium frequency driving frequencies and a long driving ON time, a plurality of high frequency driving frequencies and short Low thermal power zone with multiple thermal powers due to dynamic ON time, medium thermal power zone with multiple thermal powers greater than low thermal power due to multiple low frequency drive frequencies and medium drive ON time, and multiple medium frequency drive It has a stable mode consisting of a large thermal power zone having a plurality of thermal powers larger than the thermal power of the medium thermal power over the frequency and the long drive ON time. At the time of ignition, the ignition mode is ignited in the middle thermal power belt, After burning with one larger thermal power, when the thermal power drops and reaches a thermal power equal to the largest thermal power in the low thermal power zone of the stable mode, the thermal power level remains unchanged and the mode is switched from the ignition mode to the stable mode. Combustion control device characterized by performing combustion. When the heating power decreases in the ignition mode and becomes a heating power equal to the largest heating power in the low heating power zone of the stable mode, the combustion is continued for a predetermined time in that state, and then the ignition mode is switched to the stable mode. The combustion control device according to claim 2.

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