JP6089623B2 - Oil combustor ignition device - Google Patents

Description

  The present invention relates to a combustion control device for an oil combustor that prevents carbon and tar from adhering to the inside of a burner.

  In the oil combustor, the fuel supply means is driven by the operation signal of the operation switch to supply the fuel to the burner, and the fuel is ignited at the vaporized portion of the burner which is heated by energizing the heater, and the combustion blower blows the side wall. Combustion air is supplied from a large number of air holes opened in the air to start combustion. Immediately after the start of combustion, the temperature inside the burner is lower than that in steady combustion, and it is impossible to switch to weak combustion or strong combustion until the temperature of each part becomes almost the same as the temperature during steady combustion. However, it is set to burn with medium combustion where stable combustion can be expected. When the temperature of the burner rises after a predetermined time has elapsed, the combustion amount variable means shifts to steady combustion in which the heat generation amount is determined based on the temperature data of the temperature setting means and the temperature data of the temperature detection means.

  Further, the fuel supply means is stopped by the stop signal of the operation switch, the rotational speed of the combustion blower is post purged, and when the burner part is cooled, the combustion blower is stopped and the fire is completely extinguished. (See Patent Document 1)

Japanese Patent Laid-Open No. 7-19463

  Since the oil combustor is used by connecting it to an AC power source for household use, if the power supply from the power supply stops during combustion of the burner, the fuel supply means and the combustion blower will stop, resulting in incomplete combustion Causing carbon and tar to adhere to the burner. In addition, even if the burner during the post-purge operation is still at a high temperature after the operation is stopped, if the supply of power from the power supply stops and the combustion blower stops, carbon or tar will be generated inside the burner. Adhere to.

  Most of the bottom of the burner is maintained at a high temperature during steady combustion, so if it burns normally, the adhering carbon and tar gradually burn, and most of the burner is clean. Although it is possible to return the fuel pipe around the fuel pipe because heat is used to evaporate the fuel and it is difficult to reach a high temperature, carbon and tar may continue to adhere, causing bad odors, inability to continue combustion, and during ignition Caused ignition failure.

  In addition, after the operation is stopped, the power cord may be disconnected from the outlet without waiting for the end of the post-purge operation. If this method of use is continued, carbon and tar will accumulate in the burner in a short period of time. Although there is a possibility, since the user does not recognize that it is an incorrect usage method, a countermeasure for preventing the erroneous usage method is required in addition to a countermeasure for eliminating carbon and tar.

The present invention solves the above-mentioned problem, and is provided with a burner 2 provided in the frame 1, fuel supply means 3 for supplying fuel to the burner 2, and a combustion blower 4 for supplying combustion air to the burner 2. And a heater 5 attached in the burner 2, and temperature setting means 6 for setting the temperature of the room in which the frame 1 is installed, and the temperature in the room in which the frame 1 is installed. The fuel supply means 3 and the combustion blower 4 are determined by determining the amount of heat generated by the burner 2 based on the temperature detection means 7 to be detected, the temperature data of the temperature setting means 6 and the temperature data of the temperature detection means 7. And a combustion amount variable means 8 for driving the heater 5, the energization of the heater 5 is started by an operation signal of the operation switch 9 to heat the burner 2, and the fuel supply means 3 and the combustion blower 4 Drives and burns to the burner 2 And combustion air is supplied, the fuel is ignited by the heat of the heater 5 to start combustion, and the combustion amount varying means 8 generates the heat generated by the burner 2 for a predetermined time from the start of combustion. In the oil combustor which shifts to the steady combustion in which the calorific value of the burner 2 is changed after performing the preliminary combustion for maintaining the amount, the power input unit 10 connected to an external power source to supply power, and the power input unit And a power failure detection means 11 for detecting when power supply to the power supply 10 is interrupted. When the power failure detection means 11 detects power interruption while the fuel supply means 3 is being driven, the power input section the output power failure detection signal to the combustion amount changing means 8 at the time of the first operation after re-energization of the 10, the combustion amount changing means 8 for holding the heating value of the predetermined time is set from the start of combustion of the burner 2 the Pre-combustion And, said second retaining a predetermined time amount of heat generated by the burner 2 is changed to a predetermined heating value lower than the heating value of the preliminary combustion, to increase the interior of the burner 2 to a predetermined temperature after a predetermined time has elapsed It is characterized by.

The combustion amount varying means 8 includes a post-purge operation for driving the combustion blower 4 for a set time after the fuel supply means 3 is stopped by a stop signal of the operation switch 9, and the power failure detecting means 11 is a post-purge. operates until the end of the operation, said when detecting the interruption of power during operation of the combustion fan 4, a power failure before Symbol combustion amount changing means 8 at the time of the first operation after re-energization of the power input unit 10 outputs the detection signal, the combustion amount changing means 8 is carried out the preliminary combustion for holding the heating value of the predetermined time is set from the start of combustion of the burner 2, wherein the heating value of the burner 2 after a predetermined time has elapsed second holding predetermined time is changed to a predetermined heating value lower than the heating value of the preliminary combustion, by increasing the interior of the burner 2 to a predetermined temperature, this extinguishing carbon and tar in the burner 2 Can.

  The power failure detection means 11 is provided with a counter 12. The counter 12 counts up when a power failure detection signal is output from the power failure detection means 11, and notifies the abnormality when the counter 12 reaches a specified number of times. By operating the means 13 and outputting an alarm, attention is urged when interruption of power to the power input unit 10 is repeated continuously.

  In the present invention, the power failure detection means 11 detects when the power supply of the power input section 10 is cut off during the burner 2 combustion or the post purge operation after the fire extinguishing operation, and the power failure detection means 11 detects the power failure input means 10. When the first operation signal is output from the operation switch 9 after re-energizing to the power supply, a power failure detection signal is output to the combustion amount varying means 8. The combustion amount varying means 8 that has received the power failure detection signal fixes the heat generation amount set for a predetermined time from the start of combustion of the burner 2 and performs preliminary combustion, and then sets the predetermined heat generation amount lower than the heat generation amount of preliminary combustion. It is changed and held for a second predetermined time, and the tar and carbon adhering to the burner 2 are burned by raising the inside of the burner 2 to a predetermined temperature, which causes generation of malodor and ignition failure. Carbon and tar accumulation can be prevented.

  If the power cord is unplugged from the outlet during burner combustion or post-purge operation after a fire extinguishing operation, carbon and tar will accumulate in the burner in a short period of time, which may cause complaints such as bad odors and ignition failure. However, in this invention, when the power supply is shut off by disconnecting the power cord from the outlet during the burner burning or post-purge operation after the fire extinguishing operation, the carbon or tar disappearing operation at the first operation after re-energization. As a result, carbon and tar can be prevented from accumulating on the burner, and the frequency of complaints such as generation of odors and failure to ignite can be reduced even when erroneous operations are repeated.

  In addition, when the burner control device is provided with a counter 12 and the usage method in which the power cord is unplugged from the outlet during combustion of the burner 2 or post-purge operation after fire extinguishing operation is repeated, the number of repetitions reaches the specified number. By operating the abnormality notifying means 13 at that time, it can be notified that it is not being used correctly, and the correct usage method can be recognized, leading to a reduction in claims.

It is a block diagram which shows the structure of the combustion control apparatus of the oil combustor which is an Example of this invention. It is a flowchart which shows operation | movement of the combustion control apparatus of this invention. It is a flowchart which shows the fire extinguishing operation | movement of the combustion control apparatus of FIG. It is a flowchart which shows the power failure detection operation | movement used as the other 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 1 is a frame of an oil combustor, 2 is a burner mounted in the frame 1, 4 is a combustion blower for blowing combustion air to the burner 2, and 3 is a burner 2. Fuel supply means comprising a fuel pump for supplying fuel to 5, 5 is a preheater heater attached to the burner 2, 9 is an operation switch provided on the frame 1, and 14 is oil burning based on the signal of the operation switch 9 When the operation of the oil combustor is started by the operation switch 9, the burner control device 14 energizes the heater 5 to preheat the burner 2.

  Reference numeral 2a denotes a vaporizing portion formed at the bottom of the burner 2, and 3a denotes a fuel pipe for supplying fuel from the fuel supply means 3 to the burner 2. When preheating is started by the heater 5, the vaporizing portion 2a becomes hot and preheats. Is completed. Thereafter, when the fuel supply means 3 and the combustion blower 4 are operated, fuel is dropped from the fuel pipe 3 a protruding above the vaporization portion 2 a to the vaporization portion 2 a, and air is supplied to the burner 2 by the combustion blower 4. Then, the fuel is vaporized in the vaporizing portion 2 a and combustion is started by the heat of the heater 5, and the combustion is completed in the combustion chamber 2 b following the burner 2.

  Reference numeral 15 is an air flow path provided in the frame body 1 for the combustion gas to flow out from the combustion chamber 2 b, 16 is a hot air outlet provided in front of the frame body 1 connected to the air flow path 15, and 17 is an inlet of the air flow path 15. The high-temperature combustion gas sent from the combustion chamber 2 b to the air flow path 15 is transferred from the back of the frame 1 to the air flow path 15 by the convection blower 17. Together with the blown air, it blows forward from the hot air outlet 16 on the front surface of the frame 1 and is used for heating.

  7 is a temperature detecting means for detecting the temperature in the room where the oil combustor is installed, 6 is a temperature setting means attached to the frame 1, 8 is a fuel supply means 3 and a combustion blower 4 for controlling the heat generation of the burner 2. The burner control unit 14 compares the temperature data of the temperature setting unit 6 and the temperature detection unit 7 and inputs the comparison result of the two temperature data to the combustion amount variable unit 8. The combustion amount varying means 8 has a combustion position for changing the heat generation amount of the burner 2 in a plurality of stages or linearly by interlockingly varying the fuel supply means 3 and the combustion blower 4, and is based on the output of the burner control device 14. To select and set the optimum value.

18 is a combustion limiting means for preventing the burner 2 that has started ignition / combustion by the operation of the operation switch 9 from performing maximum combustion by the combustion amount variable means 8, and 18a is a timer that starts counting by the start signal of the operation switch 9. Yes, the timer 18a regulates the operation of the combustion restricting means 18, and the combustion restricting means 18 maintains the calorific value that the burner 2 does not reach the maximum calorific value for a predetermined time specified by the timer 18a from ignition. It has the function of continuing the pre-combustion.
For example, the burner 2 continues to burn with a calorific value smaller than the maximum calorific value for 5 minutes after ignition, regardless of the comparison result between the temperature setting means 3 and the temperature detecting means 4, and during this time, for example, by feedback of combustion heat A stable high temperature can be obtained including the vaporization part of the burner 2 as a whole.

  When the timer 18a counts a predetermined time, the combustion restricting means 18 stops and the preliminary combustion ends, and the combustion amount varying means 8 shifts to normal combustion for selecting the optimum value based on the output of the burner control device 14. When the detected temperature of the temperature detecting means 7 is far from the set temperature of the temperature setting means 6, the heat generation amount of the burner 2 is set to the maximum, and when the room temperature approaches the set temperature of the temperature setting means 6 and becomes stable, the heat generation amount is reduced. descend. Since the entire burner 2 maintains a stable high temperature, stable combustion is possible without causing abnormal combustion even if the calorific value is varied.

  When the operation is stopped by the operation switch 9, the combustion amount varying means 8 stops the fuel supply means 3, changes the combustion blower 4 to the post-purge rotation speed, operates for a set time, and the burner 2 after the fire extinguishes After cooling, the combustion blower 4 is stopped.

  Reference numeral 10 denotes a power input unit for taking in electric power from a household AC power source and supplying it to an electrical component. The power input unit 10 is connected to an indoor wall outlet and used as a fuel supply. Electrical parts such as the means 3 and the combustion blower 4 are driven by a household AC power source.

  If the power cord is unplugged from the wall outlet during combustion of the burner 2 or during post-purge operation of the combustion blower 4 after the operation is stopped, the supply of power from the power input section 10 is cut off and the fuel supply means 3 or combustion The blower 4 is stopped, but extinguishes after the fuel remaining in the burner 2 continues to burn for a while. At this time, since the burner 2 continues to burn in a state of air shortage, soot is likely to be generated, and a component that does not volatilize in the fuel remains in the vaporized portion 2a of the burner 2 and adheres in the burner as carbon or tar. For this reason, if the interruption of the supply of power from the power input unit 10 is repeated during combustion of the burner 2 or during post-purge operation after shutdown, carbon and tar accumulate in the burner 2 and soot is generated during fire extinguishing. The problem that the odor during combustion became strong and the fuel pipe 3a was clogged and combustion could not be continued occurred in a short period of time.

  In the present invention, when the power supply of the power input unit 10 is cut off by disconnecting the power cord from the wall outlet during combustion of the burner 2 or post-purge operation of the combustion blower 4 after operation stop, The purpose of the tar extinguishing operation is to prevent the accumulation of carbon and tar causing the claim, 11 is a power failure detection means for monitoring the power supply from the power input unit 10, When the operation is started by the operation switch 9, the burner control device 14 executes steps S6 to S8 in FIG. 2 to start the ignition and combustion of the burner 2, and when the fuel supply means 3 is started, the process proceeds to step S9 and a power failure occurs. An operation flag is set in the detection means 11. Further, when the operation is stopped by the operation switch 9 during combustion of the burner 2, the fire extinguishing operation is performed by executing steps S20 to S23 in FIG. 3, and when the combustion blower 4 stops, the process proceeds to step S24 and the power failure detection means 11 Clear the driving flag. When the operation flag is set in the power failure detection means 11 and the power supply of the power input unit 10 is cut off, the operation flag of the power failure detection means 11 remains set.

  When the power cord is connected to the wall outlet and power is supplied from the power input unit 10, the burner control device 14 confirms whether or not the operation flag is set in the power failure detection means 11 in step S2 of FIG. If the flag is not set, the process proceeds to step S4, and the operation is on standby. On the other hand, if it is confirmed that the operation flag is set in the power failure detection means 11, the process proceeds to step S3, and the power failure flag is set in the burner control device 14.

  When the operation is started by the operation switch 9, steps S6 to S8 are executed and the burner 2 starts ignition and combustion. When the operation flag is set in step S9, the process proceeds to step S10, the combustion limiting means 18 is activated, and the timer 18a The pre-combustion for maintaining the calorific value that the burner 2 does not satisfy the maximum calorific value is continued for the predetermined time specified in. When it is confirmed in step S11 that the predetermined time specified by the timer 18a has elapsed, the burner control device 14 confirms whether or not the power failure flag is set in step S12. If the power failure flag is not set, the process proceeds to step S16, the combustion limiting means 18 is stopped, the preliminary combustion is terminated, and the normal combustion is started.

  When the power failure flag is set in step S12, preset control data for power failure recovery is output to the combustion limiting means 18. That is, when the power failure flag is set, the routine proceeds to step S13, where the combustion limiting means 18 instructs the combustion amount variable means 8 to change the heat generation amount, and the combustion amount variable means 8 sets the heat generation amount of the burner 2 from the preliminary combustion. And the predetermined heat generation amount is maintained for a second predetermined time defined by the timer 18a. When it is confirmed in step S14 that the second predetermined time defined by the timer 18a has elapsed, the power failure flag is cleared in step S15, the process proceeds to step S16, the combustion limiting means 18 is stopped, and the normal combustion is started.

  In the embodiment, the burner 2 performs pre-combustion for 5 minutes after ignition, and then changes to a predetermined calorific value lower than the pre-combustion and continues the combustion for 5 minutes. The temperature of the burner 2 is 400 ° C. or higher. By maintaining the burner 2 at a high temperature, the carbon and tar are heated to cause thermal decomposition, and easily peel off at the initial stage. It became possible to prevent.

  When the power cord is disconnected during combustion of the burner 2 or during the post purge operation of the combustion blower 4 or when a power failure occurs, carbon or tar may adhere to the burner 2. Since the carbon and tar disappearing operation is always performed during the first operation after re-energization, accumulation of carbon and tar in the burner 2 can be prevented. For this reason, carbon or tar accumulates in the burner 2 in a short period of time even when the power cord is unplugged during combustion of the burner 2 or during the post-purge operation of the combustion blower 4. This has made it possible to reduce the frequency of complaints such as the generation of odors and ignition failures.

  Also, when using an oil combustor, the operation will not be stopped before the room is warmed up. Therefore, by specifying the timing for the carbon and tar extinguishing operation before the room is warmed up, it is ensured. It is possible to perform the extinction operation, and it is possible to reliably prevent the accumulation of carbon and tar.

FIG. 4 is a flow chart showing the operation of another embodiment of the present invention. The burner control device 14 has the power of the power input unit 10 during the combustion of the burner 2 or the post-purge operation of the combustion blower 4 after the operation is stopped. Is provided with a counter that counts the number of times the supply of power is cut off.
In FIG. 4, when the power cord is connected to the wall outlet and power is supplied from the power input unit 10, the burner control device 14 determines whether the operation flag is set in the power failure detection means 11 in step S102 of FIG. If the operation flag is not set, the process proceeds to step S103 to reset the count of the counter 12 and enter operation standby.

On the other hand, when it is confirmed in S103 that the operation flag is set, the power failure flag is set in step S104, the count of the counter 12 is added in step S105, and the count number of the counter 12 is the upper limit value in step S106. Check if it exists.
In the embodiment, the upper limit value of the count number of the counter 12 is set to 4, and when the count number of the counter 12 is up to 3 times, the process proceeds to step S107 and is put into operation standby. The same operation as the operation after step S5 in the flowchart of FIG.

  Reference numeral 13 denotes an abnormality notification means for sounding an alarm or turning on a warning lamp when the oil combustor is abnormal. When the count number of the counter 12 reaches 4, which is the upper limit value, the burner control device 14 is in the process of burning the burner 2. Even if it is determined that the power input unit 10 has been repeatedly cut off, step S108 in FIG. 4 is executed to operate the abnormality notification means 13 to notify the user of the abnormality and also operate the operation switch 9. Prevent driving from starting. In this case, it is necessary to unplug the power cord once and then plug it in again.

  For this reason, when the user unplugs the power cord every time during the combustion of the burner 2 or the post-purge operation of the combustion blower 4, it can be recognized that it is an incorrect usage method, Carbon and tar do not accumulate in the burner 2 in a short period of time, and the frequency of complaints such as generation of bad odors and ignition failure can be reduced.

DESCRIPTION OF SYMBOLS 1 Frame body 2 Burner 3 Fuel supply means 4 Combustion blower 5 Heater 6 Temperature setting means 7 Temperature detection means 8 Combustion amount variable means 9 Operation switch 10 Power supply input part 11 Power failure detection means 12 Counter 13 Abnormality notification means

Claims (3)

Burner (2) provided in the frame (1), fuel supply means (3) for supplying fuel to the burner (2), and blower for combustion (4) for supplying combustion air to the burner (2) And a heater (5) attached in the burner (2),
And temperature setting means (6) for setting the temperature in the room where the frame (1) is installed, temperature detection means (7) for detecting the temperature in the room where the frame (1) is installed,
Based on the temperature data of the temperature setting means (6) and the temperature data of the temperature detection means (7), the amount of heat generated by the burner (2) is determined, and the fuel supply means (3) and the combustion blower ( 4) and a combustion amount varying means (8) for driving
Energization of the heater (5) is started by the operation signal of the operation switch (9), the burner (2) is heated, and the fuel supply means (3) and the combustion blower (4) are driven. Supplying fuel and combustion air to the burner (2), igniting the fuel by the heat of the heater (5) and starting combustion,
The combustion amount variable means (8) changes the heat generation amount of the burner (2) after carrying out preliminary combustion for maintaining the heat generation amount of the burner (2) for a predetermined time from the start of combustion. In an oil combustor that shifts to steady combustion,
A power input unit (10) connected to an external power source for supplying power; and a power failure detection means (11) for detecting when the power supply to the power input unit (10) is interrupted,
When the power failure detection means (11) detects the interruption of electric power during the driving of the fuel supply means (3), the combustion amount varying means (in the initial operation after re-energization to the power input section (10) ( 8) Output a power failure detection signal to
It said combustion quantity changing means (8) is carried out the preliminary combustion for holding the heating value of the predetermined time is set from the start of combustion of the burner (2),
After completion of the preliminary combustion after a predetermined time has elapsed, the heat generation amount of the burner (2) is changed to a predetermined heat generation amount lower than the heat generation amount of the preliminary combustion and held for a second predetermined time, and the burner (2) A combustion control device for an oil combustor, wherein the interior of the oil is raised to a predetermined temperature. The combustion amount varying means (8) includes a post-purge operation for driving the combustion blower (4) for a set time after the fuel supply means (3) is stopped by a stop signal of the operation switch (9),
The power failure detection means (11) operates until the end of the post-purge operation, and when power interruption is detected while the combustion blower (4) is driven, after the power input section (10) is re-energized It outputs the power failure detection signal before Symbol combustion quantity changing means (8) at the time of the first operation,
It said combustion quantity changing means (8) is carried out the preliminary combustion for holding the heating value of the predetermined time is set from the start of combustion of the burner (2),
After completion of the preliminary combustion after a predetermined time has elapsed, the heat generation amount of the burner (2) is changed to a predetermined heat generation amount lower than the heat generation amount of the preliminary combustion and held for a second predetermined time, and the burner (2) The combustion control device for an oil combustor according to claim 1, wherein the interior of the fuel is raised to a predetermined temperature. The power failure detection means (11) includes a counter (12),
The counter (12) counts up when a power failure detection signal is output from the power failure detection means (11),
The combustion control device for an oil combustor according to claim 1 or 2, wherein when the counter (12) reaches a specified number of times, the abnormality notifying means (13) is operated to output an alarm.

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