JP6645542B2 - Oil burner ignition control device - Google Patents

Description

  The present invention relates to an ignition control device having a function of reliably igniting an oil combustor.

  The oil burner energizes the ignition heater by operating the operation switch, raises the internal temperature of the burner, and then drives the fuel supply means to supply fuel to the burner, and the high temperature of the burner is vaporized by the ignition heater. The part ignites the fuel and mixes with the combustion air supplied by the combustion blower to initiate combustion. The burner is provided with flame detecting means for detecting the ignited flame, and when the flame is detected by the flame detecting means, the energization of the ignition heater is stopped to continue the combustion.

  If a fire extinguishing operation is performed by an operation switch during operation of the oil combustor, the fuel supply means stops and the supply of fuel to the burner stops, and the fuel in the burner burns out to extinguish the fire and the flame detection means. When the flame is no longer detected, the combustion blower is operated in a post-purge operation to cool the burner, and then the combustion blower is stopped. (See Patent Document 1)

JP 2001-65861A

  The fuel supplied to the burner burns from components that easily vaporize, and the high-molecular-weight components that do not easily vaporize do not burn and tend to remain in the burner as tar or carbon. If an impure fuel containing a large amount of components that are difficult to vaporize is used for a long time, impurities such as carbon and tar accumulate in the burner, which may cause inability to continue combustion and cause ignition failure during ignition operation.

  If the carbon or tar deposited in the burner adheres to the flame detecting means, the flame detecting means may be in a conductive state, and the signal of the flame detection may be kept output. In this case, when the operation switch is operated by the operation switch, a flame detection signal is output by the flame detection means before the ignition heater is energized, so that an error occurs and the operation is stopped.

  Also, if the operation switch is stopped accidentally by pressing the operation switch during operation of the oil combustor, or if the operation is stopped by operating the safety device by moving or vibrating the oil combustor, the operation is immediately stopped. In some cases, the fire detection unit detects the flame immediately after the fire extinguishing operation is started. In this case, although the flame detecting means operates normally, it may be mistaken as a failure.

  The present invention solves the above problems, and includes a burner 1, a fuel supply means 2 for supplying fuel to the burner 1, a combustion blower 3 for supplying combustion air to the burner 1, and a burner 1 in the burner 1. An ignition heater 4 attached thereto; and flame detection means 5 for detecting a flame in the burner 1. The ignition heater 4 is energized by an operation start signal to heat the burner 1, and the fuel supply means is provided. 2 and the combustion blower 3 to supply fuel and combustion air to the burner 1, ignite the fuel by the heat of the ignition heater 4 to start combustion, and an operation stop signal of the burner 1. In the oil combustor that stops the fuel supply means 2 and stops the combustion blower 3 by the flame non-detection output signal of the flame detection means 5 and extinguishes the fire, the flame detection is performed by the operation start signal. When the output signal of the stage 5 is input and the flame detection output signal is output from the flame detection means 5, the combustion blower 3 is driven at a predetermined rotation speed and a timer means for counting a predetermined time. 6 is operated, and when it is confirmed that the flame detection means 5 has output a flame non-detection output signal before the timer means 6 counts for a predetermined time, the number of revolutions of the combustion blower 3 is determined in advance. The number of revolutions is changed to 2 and the energization of the ignition heater 4 is started.

  In addition, the predetermined number of revolutions of the combustion blower 3 is set to a number of revolutions corresponding to the maximum heat value, so that the flame remaining in the burner 1 is quickly extinguished.

  Further, the second rotation speed of the combustion blower 3 is set to the minimum rotation speed lower than the rotation speed at the time of combustion, so that when the fuel remaining in the burner 1 is ignited, soot and smoke are generated. It can be suppressed.

  Further, there is provided an abnormal stop means 7 for outputting an abnormal signal when the timer means 6 counts a predetermined time while the flame detection output signal from the flame detecting means 5 is continued. By outputting the operation stop signal of the burner 1 by the signal and activating the abnormality notification means 8, it is possible to reliably detect the trouble related to the flame detection means 6.

  When the operation of the burner 1 is stopped due to an erroneous operation of the oil combustor or the like, and the operation to start the operation is performed immediately to resume the operation, the fuel remaining in the burner 1 may be burned, Although the detection means 5 outputs a flame detection signal, the present invention is not limited to the operation stop signal even if the flame detection signal of the flame detection means 5 is output before the ignition heater 4 is energized by the operation start signal of the burner 1. Is not output, and the combustion blower 3 is driven at a predetermined rotation number. Thereafter, when it is confirmed that the fuel in the burner 1 is exhausted and the flame detecting means 5 outputs a flame non-detection signal to extinguish the fire by the time when the timer means 6 counts for a predetermined time, the combustion blower 3 is set to a predetermined second. And the energization of the ignition heater 4 is started. When the flame detecting means 5 is operating normally, the ignition can be performed safely without an error stop, and the usability can be improved. It is a thing.

  Further, when the flame detection means 5 outputs a flame detection signal in response to the operation start signal, the predetermined rotation speed of the combustion blower 3 is set to be driven at a rotation speed corresponding to the maximum calorific value. When the flame remains in the burner, the excess air is supplied into the burner 1 so that the flame remaining in the burner 1 can be quickly extinguished to cool the burner 1, and the ignition control can be started. it can.

  Further, when the output signal of non-flame detection from the flame detecting means 5 is confirmed, the combustion blower 3 is not stopped, but is driven by changing to a minimum rotation speed set lower than the rotation speed at the time of combustion. Therefore, when the ignition heater 4 is energized, the fuel remaining in the burner 1 may be ignited and burnt. However, since air is supplied into the burner 1 by the combustion blower 3, soot and smoke Generation can be suppressed, and adhesion of carbon and tar in the burner 1 can be prevented.

  Further, when the timer means 6 counts a predetermined time while the flame detection signal of the flame detection means 5 is being output, the abnormal stop means 7 outputs an abnormal signal. In response to the abnormal signal of the abnormal stop means 7, the operation stop signal of the burner 1 is output, the combustion blower 3 is stopped, and the abnormality notification means 8 is activated to output an alarm. It was possible to inform that a trouble had occurred, and to identify the cause.

It is a block diagram showing composition of a control device of an oil burner which is an example of the present invention. 4 is a flowchart illustrating an ignition operation of the control device according to the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is principal part sectional drawing of the oil combustor which shows the Example of this invention.

  The present invention will be described with reference to the embodiment shown in the drawings. 9 is a frame of an oil combustor, 1 is a burner mounted in the frame 9, 3 is a combustion blower for supplying combustion air to the burner 1, and 2 is a burner. Fuel supply means constituted by a fuel pump for supplying fuel to the burner 1, 4 an ignition heater mounted on the burner 1, which also serves as preheating, 10 an operation switch provided on an operation section of the frame 9, 11 a signal of the operation switch 10 Is a burner control device that controls the operation of the oil combustor based on the burner.

  Reference numeral 1a denotes a vaporized portion formed at the bottom of the burner 1, 2a denotes a fuel pipe for supplying fuel from the fuel supply means 2 to the burner 1, and an ignition heater 4 is disposed above the vaporized portion 1a of the burner 1 with a space therebetween. ing. When an operation start signal is output by the operation of the operation switch 10, the burner control device 11 energizes the ignition heater 4 to start preheating the burner 1, raise the temperature of the vaporized portion 1a of the burner 1, and supply fuel. The means 2 and the combustion blower 3 are energized and driven.

  When the fuel supply means 2 is driven, fuel drops from the fuel pipe 2a protruding above the vaporizing portion 1a to the vaporizing portion 1a, the fuel is vaporized in the vaporizing portion 1a and ignited by the heat of the ignition heater 4, and the combustion blower 3 The air mixes with the air supplied to the burner 1 to start combustion. Reference numeral 5 denotes a flame detecting means which looks into the flame in the burner 1. When the flame detecting means 5 confirms the flame and outputs that it is burning normally, the burner control device 11 sends a signal to the ignition heater 4. Is stopped and the combustion is continued.

  The oil combustor according to the embodiment is a warm air heater called a fan heater, 12 is an air flow path provided in the frame 10 and the combustion gas flows out from the burner 1, and 13 is a frame connected to the air flow path 12. A hot-air outlet 14 provided on the front surface of the frame 9 and a convection blower 14 mounted on the back surface of the frame 9 serving as an inlet of the air passage 12, and the high-temperature combustion gas sent from the burner 1 to the air passage 12 is The air blown into the air flow path 12 from the back of the frame 9 by the convection blower 14 is blown forward from the warm air outlet 13 on the front surface of the frame 9 to be heated.

  15 is a room temperature detecting means for detecting the temperature in the room where the oil combustor is installed, 16 is a room temperature setting means provided on the operation unit of the frame 9, and the burner control device 11 is a temperature set by the room temperature setting means 16. The data and the temperature data detected by the room temperature detecting means 15 are compared with each other, and the calorific value of the burner 1 is changed by interlocking and changing the fuel supply means 3 and the combustion blower 4 based on the comparison result of the two temperature data. Specifically, when the detected temperature of the room temperature detecting means 15 is far away from the set temperature of the room temperature setting means 16 and is low, the calorific value of the burner 1 is set to the maximum, and the detected temperature of the room temperature detecting means 15 is set to the maximum. When the temperature approaches the set temperature and becomes stable, the calorific value decreases.

  On the other hand, when the operation stop signal is output by the fire extinguishing operation of the operation switch 10 while the burner 1 is burning, the burner control device 11 stops the fuel supply means 2 to stop the dripping of the fuel to the burner 1 and the burner 1 When the fuel burns out, the flame is extinguished, and when the flame detection means 5 outputs that the flame is no longer confirmed and the fire is extinguished, the combustion blower 3 is changed to the post-purge rotation speed and operated for the set time, and the burner is operated. After 1 is cooled, the combustion blower 3 is stopped.

  By the way, the fuel used for the oil combustor contains impurities that are difficult to vaporize. If an impure fuel containing a large amount of impurities is used, the impurities in the fuel remain in the vaporized portion 1a of the burner 1 and become carbon or tar. To deposit in the burner 1. When the fuel pipe 2a is clogged with carbon or tar, fuel is not supplied into the burner 1, and ignition failure or combustion continuation becomes impossible.

  When carbon or tar adheres to the flame detecting means 5, the flame detecting means 5 becomes conductive because carbon and tar are conductive, and the flame detecting means 5 detects the flame even when there is no flame in the burner 1. The signal remains output. At this time, since a flame detection signal is output by the flame detection means 5 when the operation start signal is output by the operation of the operation switch 10, it can be determined that the flame detection means 5 is abnormal.

  On the other hand, when the operation switch 10 is erroneously pressed during operation of the oil combustor or strong vibration is applied to the oil combustor and the operation is stopped, an attempt is made to re-ignite immediately. The operation of the switch 10 may be performed. However, since the flame remains in the burner 1 from when the operation stop signal is output until the fuel in the burner 1 burns out, the timing at which the operation start signal is output is early. The flame is confirmed by the flame detection means 5. In this case, although the flame detecting means 5 is operating normally, it is indistinguishable from the case where carbon or tar has adhered to the flame detecting means 5. There was a problem because it was misunderstood.

  According to the present invention, when the operation start signal of the burner 1 is output by the operation switch 10 and the flame is detected by the flame detection means 6, the operation stop signal is not output and the flame detection means 5 operates normally. In this case, normal ignition control is performed, and an operation stop signal can be output only when the flame detecting means 5 is not operating normally, thereby improving usability.

  FIG. 2 is a flowchart showing the operation of the burner control device 11 according to the embodiment of the present invention. When the operation start signal is output by the operation of the operation switch 10, the output signal of the flame detection means 5 is confirmed. When a flame non-detection signal is output by the detection means 5, the ignition heater 4 is energized to start preheating of the burner 1, and the fuel supply means 2 and the combustion blower 3 are driven to perform normal ignition control. Perform

  Reference numeral 6 denotes timer means provided in the burner control device 11 for counting a predetermined time. When a flame detection signal is output by the flame detection means 5, the combustion blower 3 is driven at a predetermined rotation number. At the same time, the timer means 6 starts counting. While the combustion blower 3 is being driven, the output signal of the flame detection means 5 is checked. If the flame detection means 5 outputs a signal indicating that no flame is detected before the timer means 6 counts a predetermined time. Then, the timer means 6 is stopped to reset the count, and after changing the rotation speed of the combustion blower 3 to the second rotation speed, the ignition heater 4 is energized to perform ignition control.

  The flame remains in the burner 1 immediately after the operation stop signal is output due to the fire extinguishing operation or the like by the operation switch 10, and the flame is detected by the flame detection means 5 when the operation operation by the operation switch 10 is performed immediately after the operation is stopped. However, the burner control device 11 drives the combustion fan 3 without outputting the operation stop signal.

  By driving the combustion blower 3, the fuel remaining in the burner 1 can be burned. When the fuel remaining in the burner 1 burns out, the fire is extinguished and the flame disappears, and the flame is not detected by the flame detecting means 5. The ignition heater 4 is energized.

  Therefore, when the flame detecting means 5 is operating normally, the combustion of the burner 1 can be restarted without causing an error stop. In addition, since the ignition control is performed after the flame in the burner 1 is extinguished, the operation can be safely restarted while preventing abnormal heating or standing flame in the burner 1.

  Further, when the flame is detected by the flame detection means 5 when the operation start signal is output, there is a flame which should not be present in the burner 1 and abnormal combustion has occurred. According to the present invention, when a flame is detected by the flame detection means 5, the flame in the burner 1 is reduced as much as possible by setting the predetermined rotation speed of the combustion blower 3 to a rotation speed corresponding to the maximum heat generation amount of the burner 1. They can be erased quickly.

  The number of revolutions of the combustion blower 3 is set to the number of revolutions corresponding to the maximum calorific value of the burner 1, and the fuel remaining in the burner 1 is set in an excess air state so that the combustion is not continued so that the burner 1 does not continue. Since the internal flame can be extinguished, the abnormal state can be eliminated in a short time and the combustion of the burner 1 can be restarted.

  Further, when the ignition heater 4 is energized, if fuel remains in the burner 1, the fuel may be ignited. If the combustion is performed in a state where air is not supplied to the burner 1, the combustion is performed in a state of insufficient air. As a result, soot and smoke are generated and adhere to the inside of the burner 1 to cause tar and carbon. According to the present invention, the combustion blower 3 is driven and air is supplied into the burner 1 without stopping the combustion blower 3 when the ignition heater 4 is energized. Even if it ignites, it does not burn in a state of insufficient air, and can suppress the generation of soot and smoke.

  In the embodiment, the second rotation speed of the combustion blower 3 is set to a minimum rotation speed lower than the rotation speed corresponding to the minimum heat generation amount of the burner 1, and air is supplied into the burner 1 when the ignition heater 4 is energized. Even if it is supplied, the combustion blower 3 is set at a lower rotation speed than the rotation speed at the time of normal combustion, so that the inside of the burner 1 is not cooled, and the ignition can be reliably performed.

  In another embodiment of the present invention, reference numeral 7 denotes an abnormal stop means which operates when the timer means 6 counts for a predetermined time, and reference numeral 8 denotes an abnormal notification means constituted by a lamp, a buzzer or the like.

  When an operation start signal is output by operating the operation switch 10 and a flame detection signal is output by the flame detection means 5, the combustion fan 3 is driven and the timer means 6 starts counting. While the combustion blower 3 is being driven, the output signal of the flame detection means 5 is checked. If the flame detection means 5 outputs a signal indicating no flame detection before the timer means 6 counts a predetermined time. Then, the timer means 6 is stopped to reset the count, and the ignition heater 4 is energized to perform normal ignition control.

  On the other hand, when the timer means 6 counts a predetermined time while the flame detection means 5 outputs the flame detection signal, an abnormal stop signal is output by the abnormal stop means 7 and the burner control device 11 Is stopped, and the abnormality notification means 8 is activated to output an alarm.

  If there is no accumulation of carbon or tar in the burner 1, the time from when the fuel supply means 2 stops until the fuel in the burner 1 burns out is stable, and the count time of the timer means 6 is reduced. Never exceed. On the other hand, if carbon or tar accumulates in the burner 1, the fuel impregnated in the carbon or tar burns little by little and the combustion time becomes longer. May remain. Further, when carbon or tar adheres to the flame detecting means 5, the flame detecting means 5 becomes conductive, and a signal of flame detection is outputted even if there is no flame in the burner 1, so that the flame detecting means 5 can operate normally. The flame detection signal is kept output even if the count time of the timer means 6 is exceeded.

  As described above, when the time during which the flame detection signal is output by the flame detection means 5 becomes longer than the predetermined time, carbon and tar accumulate in the burner 1 and the flame in the burner 1 does not disappear. Or that the flame detecting means 5 is not operating normally. For this reason, even if the flame is detected by the flame detection means 5 when the operation start signal is output, the burner 1 starts burning when the flame detection means 5 is operating normally, and the trouble of the burner 1 or the like. The abnormal stop means 7 can be operated only when the flame detection means 5 is not operating normally. Further, the abnormality notification means 8 selects and outputs the corresponding error number. By setting the error number separately from the ignition failure error, the cause of the error can be easily specified.

DESCRIPTION OF SYMBOLS 1 Burner 2 Fuel supply means 3 Combustion blower 4 Ignition heater 5 Flame detection means 6 Timer means 7 Abnormal stop means 8 Abnormality notification means

Claims (4)

A burner (1); a fuel supply means (2) for supplying fuel to the burner (1); a combustion blower (3) for supplying combustion air to the burner (1); With the attached ignition heater (4),
And flame detecting means (5) for detecting a flame in said burner (1),
The ignition heater (4) is energized by the operation start signal to heat the burner (1), and the fuel supply means (2) and the combustion blower (3) are driven to supply fuel to the burner (1). And combustion air, and ignites the fuel by the heat of the ignition heater (4) to start combustion,
Petroleum to stop the fuel supply means (2) by the operation stop signal of the burner (1), and to stop the fire by extinguishing the combustion blower (3) by the flame non-detection output signal of the flame detection means (5). In the combustor,
An output signal of the flame detection means (5) is input by the operation start signal, and when an output signal of flame detection is output from the flame detection means (5), the combustion blower (3) is set to a predetermined predetermined value. A timer means (6) for driving at a rotation speed and counting a predetermined time is operated, and an output signal of no flame detection is output from the flame detection means (5) until the timer means (6) counts a predetermined time. When the operation is confirmed, the rotation speed of the combustion blower (3) is changed to a predetermined second rotation speed, and the energization of the ignition heater (4) is started. Ignition control device.   The ignition control device for an oil combustor according to claim 1, wherein the predetermined rotation speed of the combustion blower (3) is set to a rotation speed corresponding to a maximum calorific value. The ignition control device for an oil combustor according to claim 2 , wherein the second rotation speed of the combustion blower (3) is set to a minimum rotation speed lower than the rotation speed during combustion. An abnormal stopping means (7) for outputting an abnormal signal when the timer means (6) counts a predetermined time while the flame detecting output signal from the flame detecting means (5) continues; The ignition control of an oil combustor according to claim 2 or 3 , wherein an operation stop signal of the burner (1) is output in response to the abnormality signal of the means (7), and the abnormality notification means (8) is operated. apparatus.

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