JP6421460B2 - Ignition control device for oil combustor - Google Patents

Description

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

  The oil combustor energizes the ignition heater by operating the operation switch, raises the temperature inside the burner, then drives the fuel supply means to supply fuel to the burner, and vaporizes the burner heated to a high temperature by the ignition heater The fuel is ignited in part and mixed with the combustion air supplied by the combustion blower to start combustion. The burner is provided with flame detection means for detecting the ignited flame. When the flame is confirmed by the flame detection means, the ignition heater is deenergized and combustion is continued.

  Also, if a fire extinguishing operation is performed with the operation switch during the operation of the oil combustor, the fuel supply means stops, the fuel supply to the burner stops, the fuel in the burner burns out, the fire extinguishes, and the flame detection means When the flame is not confirmed by the above, the combustion blower is post-purged to cool the burner, and then the combustion blower is stopped. (See Patent Document 1)

JP 2001-65861 A

  The fuel supplied to the burner burns from the components that are easily vaporized, and the high molecular weight component that is difficult to vaporize does not burn but tends to remain in the burner as tar or carbon. If an impure fuel containing a lot of components that are hard to vaporize is used for a long time, impurities such as carbon and tar accumulate in the burner, causing inability to continue combustion and failure of ignition during ignition operation.

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

  Also, if the operation switch is accidentally pressed during operation of the oil combustor, or if the operation is stopped due to the movement or vibration of the oil combustor and the operation of the safety device being stopped, the operation is immediately started. Although it may try to resume, immediately after entering the fire extinguishing operation, the flame detection means detects the flame, so an error occurs and the operation is stopped. In this case, the flame detection means is operating normally, but it may be mistaken for a failure.

The present invention solves the above-mentioned problem. In the burner 1, a fuel supply means 2 for supplying fuel to the burner 1, a combustion fan 3 for supplying combustion air to the burner 1, and the burner 1 are provided. And a flame detecting means 5 for detecting a flame in the burner 1, energizing the ignition heater 4 by an operation start signal to heat the burner 1, and the fuel supply means 2 and the combustion blower 3 are driven to supply fuel and combustion air to the burner 1, the fuel is ignited by the heat of the ignition heater 4, and combustion is started. 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 to extinguish the fire, the flame detection is detected by the operation start signal. When the output signal of stage 5 is input and the flame detection output signal is output from the flame detection means 5, the combustion blower 3 is driven and the timer means 6 for counting a predetermined time is operated, and the timer When it is confirmed that the flame non-detection output signal is output from the flame detection means 5 before the means 6 counts for a predetermined time, the rotational speed of the combustion blower 3 is set to a minimum rotational speed lower than the rotational speed during combustion. It changes, and the electricity supply of the said ignition heater 4 is started, It is characterized by the above-mentioned.

Further, when the output signal of the flame detection means 5 is input in response to the operation start signal and the flame detection output signal is output from the flame detection means 5, the combustion blower 3 is set at a predetermined rotational speed. By driving, the flame remaining in the burner 1 is quickly extinguished.

Further, when said timer means 6 and it was confirmed that the output signal of the flame not detected from the flame detecting means 5 until the count said predetermined time is output, the rotation at the time of combustion a rotation speed of the combustion air blower 3 By changing to a minimum rotational speed lower than the number and starting energization of the ignition heater 4, generation of soot and smoke can be suppressed when the fuel remaining in the burner 1 is ignited.

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

  When the operation of the burner 1 is stopped due to an erroneous operation of the oil combustor or the like, if the operation start operation is performed in an attempt to restart the operation immediately, the fuel remaining in the burner 1 may be burned, and the flame Although the detection means 5 outputs a flame detection signal, the present invention does not require an 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. Thereafter, when it is confirmed that the fuel in the burner 1 has run out and the flame detection means 5 outputs a flame non-detection signal to extinguish the fire, the energization of the ignition heater 4 is started, and the flame detection means 5 operates normally. In this case, it is possible to ignite safely without stopping the error and to improve usability.

  Further, when the flame detection means 5 outputs a flame detection signal in response to the operation start signal, the combustion blower 3 is set to be driven at a predetermined number of revolutions, and the flame remains in the burner 1. When the engine is in operation, 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 ignition control can be started.

  In addition, the flame detection means 5 outputs a flame detection signal in response to the operation start signal to drive the combustion blower 3, and then the ignition heater 4 is energized when the flame non-detection output signal of the flame detection means 5 is confirmed. The combustion blower 3 does not stop at this time, but is configured to be driven by changing to the minimum rotational speed set lower than the rotational speed during combustion. Therefore, when the ignition heater 4 is energized, However, since the combustion blower 3 supplies air to the burner 1, the generation of soot and smoke can be suppressed, and the carbon in the burner 1 Tar adhesion can be prevented.

  When the flame detection means 5 outputs a flame detection signal according to the operation start signal of the burner 1, the combustion blower 3 is activated and the timer means 6 starts counting, and the flame detection signal of the flame detection means 5 is detected. When the timer means 6 counts a predetermined time while the signal is output, the abnormal stop means 7 outputs an abnormal signal. In response to the abnormality signal from the abnormality stopping means 7, the operation stop signal of the burner 1 is output, the combustion blower 3 is stopped, and the abnormality notifying means 8 is activated to output an alarm, so that it relates to the flame detection means 5. It was possible to notify that a trouble occurred and to identify the cause.

It is a block diagram which shows the structure of the control apparatus of the oil combustor which is an Example of this invention. It is a flowchart which shows the ignition operation of the control apparatus which is an Example of this invention. 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 embodiments shown in the drawings. Reference numeral 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, 2 is Fuel supply means comprising a fuel pump for supplying fuel to the burner 1, 4 is a preheating ignition heater attached to the burner 1, 10 is an operation switch provided in the operating portion of the frame body, and 11 is a signal of the operation switch 10 Is a burner control device for controlling the operation of the oil combustor based on the above.

  Reference numeral 1a denotes a vaporizing 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 the ignition heater 4 is disposed above the vaporizing 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 of the burner 1, raises the temperature of the vaporized portion 1a of the burner 1, and supplies fuel. The means 2 and the combustion blower 3 are energized and driven.

  When the fuel supply means 2 is driven, the fuel drops from the fuel pipe 2a protruding above the vaporization portion 1a to the vaporization portion 1a. Is mixed with the air supplied to the burner 1 to start combustion. Reference numeral 5 denotes flame detection means that looks into the flame in the burner 1. When the flame detection means 5 confirms that the flame is being burned and outputs that the combustion is normally performed, the burner control device 11 sends the ignition heater 4 to the ignition heater 4. Stop energizing and continue combustion.

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

  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 in the operation section 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, and based on the comparison result of the two temperature data, the fuel supply means 3 and the combustion blower 4 are interlocked and varied to change the amount of heat generated by the burner 1. Specifically, when the detected temperature of the room temperature detecting means 15 is far from the set temperature of the room temperature setting means 16 and is low, the heat generation amount of the burner 1 is set to the maximum, and the detected temperature of the room temperature detecting means 15 is set to the room temperature setting means 16. When the temperature approaches and stabilizes, the amount of heat generation decreases.

  On the other hand, when an operation stop signal is output by a fire extinguishing operation of the operation switch 10 during combustion of the burner 1, the burner control device 11 stops the fuel supply means 2, and dripping of fuel into the burner 1 stops. When the fuel is burned out, the flame is extinguished, and when the flame detection means 5 outputs that the flame is not confirmed and the fire is extinguished, the combustion blower 3 is changed to the post-purge rotation speed and is operated for a set time. The combustion blower 3 is stopped after 1 is cooled.

  By the way, the fuel used in 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. In the burner 1. If the fuel pipe 2a is clogged with carbon or tar, the fuel is not supplied into the burner 1 and ignition failure or combustion cannot be continued.

  When carbon or tar adheres to the flame detection means 5, the flame detection means 5 becomes conductive because the carbon or tar is conductive, and the flame detection means 5 detects the flame even when there is no flame in the burner 1. The signal remains output. At this time, since the flame detection means 5 outputs a flame detection signal 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 is stopped by accidentally pushing the operation switch 10 or applying strong vibration to the oil combustor during the operation of the oil combustor, the operation is attempted to re-ignite immediately. The switch 10 may be operated, but since the flame remains in the burner 1 until the fuel in the burner 1 is burned out after the operation stop signal is output, the timing at which the operation start signal is output is early. The flame detection means 5 confirms the flame. In this case, the flame detection means 5 is operating normally, but since it cannot be distinguished from when carbon or tar adheres to the flame detection means 5, if it is determined that the flame detection means 5 is abnormal, it has failed. There was a problem because it was mistaken.

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

  FIG. 2 is a flowchart showing the operation of the burner control apparatus 11 according to the embodiment of the present invention. When an operation start signal is output by the operation of the operation switch 10, the output signal of the flame detection means 5 is confirmed and the flame is detected. When the detection means 5 outputs a flame non-detection signal, 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. To do.

  On the other hand, when the flame detection means 5 outputs a flame detection signal, the combustion blower 3 is driven. While the combustion blower 3 is being driven, the output signal of the flame detection means 5 is confirmed. When the flame detection means 5 outputs a flame non-detection signal, the ignition heater 4 is energized and thereafter Ignition control is performed.

  Immediately after the operation stop signal is output by a fire extinguishing operation or the like by the operation switch 10, flame remains in the burner 1. When the operation operation by the operation switch 10 is performed immediately after the operation stop, the flame is confirmed by the flame detection means 5. However, the burner control device 11 does not output an operation stop signal and drives the combustion blower 3.

  By driving the combustion blower 3, the fuel remaining in the burner 1 can be combusted. When the fuel remaining in the burner 1 is burned out, the flame is extinguished and the flame disappears. The ignition heater 4 is energized.

  For this reason, when the flame detection means 5 is operating normally, the combustion of the burner 1 can be resumed without stopping the error. Further, since the ignition control is performed after the flame in the burner 1 disappears, the operation can be restarted safely while preventing abnormal heating or standing flame in the burner 1.

  Further, when a flame is confirmed by the flame detection means 5 when the operation start signal is output, there is a flame that should not exist in the burner 1, and abnormal combustion has occurred. In this invention, when a flame is confirmed by the flame detection means 5, the flame in the burner 1 can be extinguished as quickly as possible by setting the rotation speed of the combustion blower 3 to a predetermined rotation speed. I am doing so.

  In the embodiment, the rotational speed corresponding to the maximum heat generation amount of the burner 1 is set, and by making the air excessive with respect to the fuel remaining in the burner 1, the flame in the burner 1 is prevented from continuing combustion. Since it can be extinguished, the abnormal state can be resolved in a short time and the combustion of the burner 1 can be resumed.

  In another embodiment of the present invention, when a flame detection signal is output by the flame detection means 5 to drive the combustion blower 3, and then a flame non-detection signal is output by the flame detection means 5, The rotational speed of the combustion blower 3 is set to be changed to a minimum rotational speed lower than the rotational speed corresponding to the minimum calorific value of the burner 1, and the combustion blower 3 is turned on when energization of the ignition heater 4 is started. Air is supplied into the burner 1 without stopping.

  When the ignition heater 4 is energized, if fuel remains in the burner 1, this fuel may ignite. If combustion is performed in a state where no air is supplied to the burner 1, combustion occurs in an air-deficient state. In order to generate soot and smoke, it adheres to the burner 1 and causes tar and carbon. In this invention, since the combustion blower 3 is driven when the ignition heater 4 is energized and air is supplied into the burner 1, even if the fuel in the burner 1 is ignited, it does not burn in an air-deficient state. It can suppress the generation of soot and smoke. Even if air is supplied into the burner 1 when the ignition heater 4 is energized, the combustion blower 3 is set to a rotational speed lower than the rotational speed during normal combustion, so the interior of the burner 1 is cooled. It can be ignited reliably.

  In another embodiment of the invention, 6 is a timer means for counting a predetermined time provided in the burner control device 11, 7 is an abnormal stop means that operates when the timer means 7 counts for a predetermined time, 8 is a lamp or It is an abnormality notification means comprised of a buzzer or the like.

  When an operation start signal is output by the operation of the operation switch 10 and a flame detection signal is output by the flame detection means 5, the combustion blower 3 is driven and the timer means 6 starts counting. While the combustion blower 3 is driven, the output signal of the flame detection means 5 is confirmed, and if the flame detection means 5 outputs a flame non-detection signal 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, the abnormal stop means 7 outputs an abnormal stop signal, and the burner control device 11 outputs the combustion blower 3. Is stopped and the abnormality notifying means 8 is operated 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. Never exceed. On the other hand, if carbon or tar accumulates in the burner 1, the fuel soaked in the carbon or tar gradually burns to increase the combustion time. It may remain. Further, when carbon or tar adheres to the flame detection means 5, the flame detection means 5 becomes conductive, and a flame detection signal is output even if there is no flame in the burner 1, so that the flame detection means 5 can operate normally. Even when the count time of the timer means 6 is exceeded, the flame detection signal remains output.

  As described above, when the flame detection signal is output by the flame detection means 5 for a longer time than the predetermined time, carbon or tar accumulates in the burner 1 and the flame in the burner 1 does not disappear. It can be determined that the flame detection means 5 is not operating normally. For this reason, even if a flame is confirmed by the flame detection means 5 when the operation start signal is output, the burner 1 starts to combust when the flame detection means 5 is operating normally. The abnormal stop means 7 can be operated only when the flame detection means 5 is not operating normally. Further, the abnormality notifying means 8 selects and outputs a corresponding error number, and by setting the error number in distinction from the ignition failure error, the cause of the error can be easily identified.

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 (3)

In the 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 the burner (1) An installed ignition heater (4),
And flame detection means (5) for detecting the flame in the burner (1),
In response to an operation start signal, the ignition heater (4) is energized 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 is supplied, the fuel is ignited by the heat of the ignition heater (4), and combustion is started.
Oil that stops the fuel supply means (2) by the operation stop signal of the burner (1) and stops the combustion blower (3) by the flame non-detection output signal of the flame detection means (5) to extinguish the fire. In the combustor,
The output signal of the flame detection means (5) is inputted by the operation start signal, and when the flame detection output signal is outputted from the flame detection means (5), the combustion blower (3) is driven, When the timer means (6) for counting a predetermined time is operated and it is confirmed that the flame non-detection output signal is output from the flame detection means (5) before the timer means (6) counts for a predetermined time, An oil control device for an oil combustor, characterized in that the rotational speed of the combustion blower (3) is changed to a minimum rotational speed lower than the rotational speed during combustion and energization of the ignition heater (4) is started.   When the output signal of the flame detection means (5) is input by the operation start signal and the flame detection output signal is output from the flame detection means (5), the combustion blower (3) is predetermined. 2. The ignition control device for an oil combustor according to claim 1, wherein the ignition control device is driven at a predetermined rotational speed. An abnormality stop means (7) for outputting an abnormality signal when the timer means (6) counts a predetermined time while the flame detection output signal from the flame detection means (5) continues, is provided. The ignition control device for a petroleum combustor according to claim 1 or 2, wherein an operation stop signal of the burner (1) is output by an abnormality signal of (7) and an abnormality notification means (8) is operated. .

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