JP2021018006A - Control device of pellet heating device - Google Patents

Abstract

To provide a control device of a pellet heating device which can surely remove a clinker in a burner.SOLUTION: A control device of a pellet heating device comprises a burner 5 arranged in a combustion chamber 4, fuel supply means 3 for supplying fuel in a fuel tank 2 to the burner 5, and a combustion fan 9 for supplying combustion air to the burner 5, and the combustion control means 17 controls rotation numbers of the fuel supply means 3 and the combustion fan 9 so that the fuel is combusted at a combustion amount which is set by combustion amount setting means 20. When a continuous combustion time of the burner 5 reaches a preset set time T, the combustion control means 17 starts a removal mode for combusting a combustion product in the burner 5, and changes the rotation number of the combustion fan 9 so that the rotation number is increased by a prescribed rotation number n from a rotation number N corresponding to a combustion amount P which is set by the combustion amount setting means 20. A rotation number which is determined corresponding to each combustion amount P is set as the prescribed rotation number n.SELECTED DRAWING: Figure 1

Description

The present invention relates to a control device for a pellet heating device that burns wood pellets for heating.

When the pellet heating device starts operation, combustion air is sent to the burner by a combustion fan, fuel contained in the fuel tank inside the frame is supplied to the burner by the fuel supply means, and the ignition heater is energized to heat the fuel. To. When the fuel is ignited and combustion is started, the generated combustion gas is sent from the combustion chamber to the heat exchange chamber. The air supply / exhaust pipes provided on the back of the frame are connected to the air supply / exhaust pipes that connect indoors and outdoors through the walls of the room where the pellet heating device is installed, and the air supplied to the burner is taken in from the outside to take in the heat exchange room. The combustion gas emitted from the above is discharged outdoors.

In addition, a continuous ventilation path is formed from the lower part of the frame body to the front surface of the frame body, a convection fan is arranged on the inlet side of the ventilation path, and a warm air outlet is provided on the front surface of the frame body which is the outlet of the ventilation path. Is equipped with a heat exchange pipe that penetrates the heat exchange chamber. When the air sent into the air passage by the convection fan passes through the heat exchange pipe, it exchanges heat with the combustion gas in the heat exchange chamber, becomes warm air, and blows out from the hot air outlet for heating.

Pellet fuel sent to the burner becomes ash by combustion and either falls into a saucer placed below the burner or is discharged outdoors together with combustion gas, but it is a component that is hard to burn depending on the type of pellet fuel used. If a fuel containing a non-combustible component is used, a large amount of ash is produced, and the ash tends to solidify due to impurities contained in the ash, which may remain in the burner as a combustion product.

When combustion products are generated in the burner, the flow of combustion air is obstructed, combustion is deteriorated due to lack of air, and combustion products and soot are likely to be generated, and further combustion products are generated and accumulated in the burner. In addition, fuel that cannot be burned accumulates in the burner, and when the fire is extinguished, the fuel remaining in the burner and combustion products cause problems such as a long fire extinguishing time.

Therefore, the inside of the burner is inspected before operation, and the ash accumulated in the saucer and the combustion products accumulated in the burner are instructed to be cleaned, but it is often used without being inspected. As a result, a large amount of combustion products are deposited in the burner.

In addition, since the pellet heater can be operated continuously for a long time, if the burner burns continuously for a long time, ash and combustion products may accumulate even if it burns normally, and it continues for a long time. It has been proposed to perform a cleaning operation at regular intervals when burning (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-267709

In the conventional cleaning operation, the fuel supply is stopped while increasing the combustion air supplied to the burner to create a state of excess air, and the combustion products in the burner are burned. However, the combustion products are generated in the burner. When it is not generated or when the amount of combustion products is small, the fuel in the burner burns out in a short period of time, and there is a risk of misfire during the cleaning operation.

The present invention realizes a pellet heating device provided with a control device capable of reliably removing combustion products in a burner without causing a misfire during a cleaning operation.

The present invention solves the above-mentioned problems, and conveys fuel from a combustion chamber 4, a burner 5 installed in the combustion chamber 4, and a fuel tank 2 into the frame body 1 and supplies the fuel to the burner 5. A combustion fan 9 for supplying combustion air to the burner 5 is provided, and the fuel supply means 3 and the combustion fan 9 are provided so as to burn at a combustion amount set by the combustion amount setting means 20. In the pellet heating device provided with the combustion control means 17 for controlling the number of revolutions, the combustion control means 17 includes a counting means 22 for counting the combustion time of the burner 5, and the continuous combustion time of the burner 5 is set in advance. When the time T is reached, the rotation speed of the combustion fan 9 is changed so as to be higher than the rotation speed N corresponding to the combustion amount P set by the combustion amount setting means 20 by a predetermined predetermined rotation speed n. Pellet heating is provided with a removal mode for burning the combustion products in the burner 5, and the predetermined number of revolutions n in the removal mode is a number of revolutions determined corresponding to each combustion amount N. It is a control device of the device.

Further, as the combustion amount P set by the combustion amount setting means 20 becomes larger, the predetermined rotation speed n in the removal mode is set to be larger, so that the amount of air increases with respect to the fuel in the burner 5. Too much misfire can be prevented and combustion products can be burned.

Further, the removal mode is changed so that the rotation speed of the combustion fan 9 is increased by a predetermined predetermined rotation speed n from the rotation speed N corresponding to the combustion amount P set by the combustion amount setting means 20. After that, when a certain period of time elapses, the rotation speed N corresponding to the combustion amount P set by the combustion amount setting means 20 is changed so as to be lower by a predetermined predetermined rotation speed n, and the rotation speed N is changed at regular intervals. By providing the rotation speed change command that is repeatedly output, it is possible to prevent the burner 5 from running out of fuel and misfire, and the combustion product in the burner 5 can be burned.

Further, in the removal mode, the operation and stop of the fuel supply means 3 are repeated at regular intervals, and an intermittent drive command for intermittently supplying fuel is provided, so that the burner is used when the fuel supply is stopped. By burning the combustion product in the burner 5 and restarting the fuel supply, it is possible to prevent the burner 5 from running out of fuel and causing a misfire.

Further, the frame 1 includes a temperature detecting means 19 for detecting the temperature of the combustion gas, and the combustion controlling means 17 of the temperature detecting means 19 before a predetermined time elapses after starting the removal mode. By terminating the removal mode when the detection temperature drops below the predetermined temperature, the removal mode is ended before the fuel in the burner 5 runs out, and the normal operation is resumed to continue combustion without misfire. be able to.

Further, the combustion control means 17 shortens the set time T for starting the removal mode when the continuous combustion time of the burner 5 reaches the second set time T2, whereby the continuous combustion of the burner 5 is performed. When the time becomes long, the timing to start the removal mode is advanced.

Further, when the continuous combustion time of the burner 5 reaches the third set time T3, a combustion stop command of the burner 5 is output, and when the detection temperature of the temperature detecting means 19 drops to a predetermined temperature or less, the burner By providing an inspection mode that outputs the combustion start command of No. 5, measures the time until the detection temperature of the temperature detecting means 19 reaches a predetermined temperature or higher, and outputs an error alarm when the temperature is shorter than the predetermined time. , It is possible to inform the user that the combustion product is accumulated in the burner 5.

In the present invention, when the continuous combustion time of the pellet heating device reaches the set time T, the combustion control means 17 starts the removal mode, and the rotation speed of the combustion fan 9 is determined more than the rotation speed N corresponding to the combustion amount of the burner 5. Since the number of revolutions is changed to increase by n, the amount of combustion air increases with respect to the fuel supplied into the burner 5, and when the combustion products are accumulated in the burner 5, the combustion products are burned and removed. can do. The predetermined number of revolutions n in the removal mode is a number of revolutions determined corresponding to each combustion amount P, and the combustion balance can be smoothly shifted to the removal mode without significantly changing the combustion balance, which is supplied to the burner 5. By preventing the amount of air from becoming too large for the fuel, there is no misfire even when the amount of combustion products is low.

Further, the predetermined number of revolutions n is set larger as the combustion amount of the burner 5 increases, and when the combustion amount of the burner 5 is large, the combustion product can be burned by increasing the amount of air, and the burner 5 can be burned. By suppressing the increase in the amount of air when the amount of combustion is small, it is possible to prevent misfire when the amount of combustion products is small.

Further, in the removal mode, the rotation speed of the combustion fan 9 is changed from the rotation speed N corresponding to the combustion amount to a predetermined rotation speed n higher, and after a certain period of time, the rotation speed N corresponding to the combustion amount is changed to a predetermined rotation speed n lower. It is equipped with a rotation speed change command that repeatedly changes the rotation speed at regular intervals, burns the combustion products in the burner 5 when the rotation speed of the combustion fan 9 is high, and burners when the rotation speed is low. Since the amount of combustion air is less than the fuel supplied to 5, the fuel in the burner 5 is prevented from burning out in a short time and misfire.

Further, in the removal mode, the operation and stop of the fuel supply means 3 are repeated at regular intervals, and an intermittent drive command for intermittently supplying fuel to the burner 5 is provided, and the burner is provided while the fuel supply means 3 is stopped. It is possible to prevent a misfire by burning the combustion product in 5 and driving the fuel supply means 3 to supply fuel. Further, since the ash in the burner 5 can be wound up by the fuel falling on the burner 5 and the ash can be carried by the air flow of the combustion fan 9, the accumulation of the ash in the burner 5 can be suppressed.

Further, a temperature detecting means 19 for detecting the temperature of the combustion gas is provided in the frame 1, and it is confirmed whether or not the temperature detecting means 19 detects a temperature below a predetermined temperature between the start and the end of the removal mode. There is. As the fuel in the burner 5 decreases, the flame gradually becomes smaller and the temperature of the combustion gas decreases, and when the detection temperature of the temperature detecting means 19 becomes equal to or lower than the predetermined temperature, the removal mode is terminated. In this way, when the amount of combustion products in the burner 5 is small, the removal mode can be terminated in a short time and the normal combustion can be resumed, so that the fuel in the burner 5 is exhausted and the misfire does not occur. Is.

Further, when the continuous combustion time of the burner 5 reaches the second set time T2, the set time T of the continuous combustion time of the burner 5 is changed to be shorter, and the timing for starting the removal mode from the next time onward is made earlier. .. The pellet stove can be used continuously without stopping the operation, but when the continuous combustion time of the burner 5 is long, combustion products are likely to be generated. Therefore, when the continuous combustion time of the burner 5 is long. By starting the removal mode early, it is possible to suppress the generation of combustion products in the burner 5.

When the continuous combustion time of the burner 5 reaches the third set time T3, the combustion stop command of the burner 5 is output and the burner 5 is burned until the detection temperature of the temperature detecting means 19 becomes equal to or lower than the predetermined temperature. When the temperature is stopped and the temperature drops below a predetermined temperature, a combustion start command for the burner 5 is output. If the time from the combustion start command of the burner 5 to the temperature detected by the temperature detecting means 19 reaching the predetermined temperature or higher is longer than the predetermined time, the normal operation is resumed as it is, but if it is shorter than the predetermined time, an error alarm is output. It is a thing. In this way, the user can be notified that the combustion products are accumulated in the burner 5, and the user can clean the inside of the burner 5 to remove the combustion products.

It is a block diagram of the pellet heating apparatus which shows the Example of this invention. It is sectional drawing of the main part of the pellet heating apparatus which shows the Example of this invention.

Explaining the present invention by the embodiment shown in the figure, 1 is a frame body of a pellet heating device, 2 is a fuel tank provided on the back side in the frame body 1 and the upper side is open, and 2 a is opened and closed on the upper surface of the frame body 1. The tank lid 3 of the fuel tank 2 provided as possible is a fuel supply means attached to the bottom of the fuel tank 2, and the tank lid 2a on the upper surface of the frame 1 is opened to charge pellet fuel.

3a is a tubular cover provided at the bottom of the fuel tank 2 for forming a fuel transport path, 3b is a screw for transporting fuel arranged in the cover 3a, and 3c is a motor for driving the screw 3b. It constitutes the supply means 3. The fuel at the bottom of the fuel tank 2 enters the cover 3a through the opening provided at the bottom of the cover 3a, and when the motor 3c is driven and the screw 3b rotates, the fuel at the bottom of the cover 3a is conveyed and carried to the upper part inside the cover 3a. Is done.

4 is a combustion chamber arranged on the front side in the frame 1, 5 is a burner installed in the combustion chamber 4, 4a is a fuel supply port provided on the wall of the combustion chamber 4 higher than the burner 5, and 6 is a cover 3a. It is a fuel guide path that communicates the opening provided in the upper part of the combustion chamber 4 with the fuel supply port 4a of the combustion chamber 4, and the fuel carried to the upper part in the cover 3a by the screw 3b is transmitted from the fuel supply port 4a via the fuel guide path 6. It falls and is supplied to the burner 5.

Reference numeral 7 denotes an air supply port composed of an air supply pipe 7a provided on the back surface of the frame body 1, reference numeral 8 denotes an exhaust port composed of an exhaust pipe 8a arranged inside the air supply pipe 7a, and the air supply pipe 7a and the exhaust pipe 8a are walls. It is connected to the air supply / exhaust pipe top that is installed through the. 9 is a combustion fan for supplying combustion air to the burner 5, 10 is a heat exchange chamber continuous to the upper part of the combustion chamber 4, and 11 is an exhaust path connecting the heat exchange chamber 10 and the exhaust pipe 8a. 9 is arranged between the exhaust path 11 and the exhaust pipe 8a.

Reference numeral 12 denotes an air supply path connecting the air supply pipe 7a and the combustion air hole 5a provided on the back surface of the burner 5, and reference numeral 13 denotes an ignition heater arranged in the air supply path 12 near the combustion air hole 5a of the burner 5. When the combustion fan 9 is driven, the outdoor air sucked from the air supply port 7 is supplied to the burner 5 from the combustion air hole 5a. At this time, a part of the air is heated by the ignition heater 13 and then supplied to the burner 5. To. The fuel supplied to the burner 5 is heated by high-temperature hot air, ignited, mixed with air, and starts combustion in the burner 5. The generated high-temperature combustion gas rises in the combustion chamber 4, passes through the heat exchange chamber 10 and the exhaust path 11, and is discharged to the outside from the exhaust port 8.

14 is a convection path continuous from the lower part of the frame 1 to the upper part of the front surface of the frame 1, 15 is a convection fan provided on the inlet side of the blower path 14, and 16 is a warm air outlet formed on the outlet side of the blower path 14. Reference numeral 14a is a plurality of heat exchange pipes arranged so as to penetrate the heat exchange chamber 10, and the air sent into the air passage 14 by the convection fan 15 passes through the heat exchange pipe 14a in the heat exchange chamber. It exchanges heat with the combustion gas of No. 10, becomes warm air, and blows out from the warm air outlet 16.

Reference numeral 17 denotes a combustion control means equipped with a microcomputer for controlling the operation of the pellet heating device, reference numeral 18 denotes an operation switch for performing an operation / stop operation of the pellet heating device, and an on / off signal of the operation switch 18 is a combustion control means. It is sent to 17, and the combustion control means 17 issues a drive / stop command to the motor 3c, the combustion fan 9, the convection fan 15, the ignition heater 13 and the like constituting the fuel supply means 3 based on the signal of the operation switch 18, and pellet heating. Control the operation of the device.

Reference numeral 19 denotes a temperature detecting means composed of a thermistor provided in the exhaust path 11, and detects the temperature of the combustion gas flowing through the exhaust path 11. When the ON signal of the operation switch 18 is sent to the combustion control means 17, the combustion control means 17 drives the combustion fan 9, the motor 3c constituting the fuel supply means 3, and the ignition heater 13 in this order, and the fuel supplied to the burner 5. When the combustion is started, the temperature of the exhaust path 11 rises, and when the temperature detected by the temperature detecting means 19 exceeds a certain temperature, the convection fan 15 is driven and the energization of the ignition heater 13 is stopped.

Reference numeral 20 denotes a combustion amount setting means for setting the combustion amount of the burner 5. When the combustion amount setting means 20 is operated to set the combustion amount, the combustion control means 17 increases the rotation speed of the combustion fan 9 and the fuel supply means 3. The number of rotations of the motor 3c of the above is changed to control so as to burn at the combustion amount set by the combustion amount setting means 20. Reference numeral 21 denotes an air volume setting means, and when the air volume setting means 21 is operated to set the air volume, the combustion control means 17 changes the rotation speed of the convection fan 15 to control the air volume so as to be set.

In the embodiment of the present invention, the combustion amount of the burner 5 has five stages from the minimum combustion amount P1 to the maximum combustion amount P5, the rotation speed of the combustion fan 5 is N1 to N5, and the fuel supply means 3 corresponds to each combustion amount. The rotation speed of the motor 3c is set to M1 to M5, respectively.

When the off signal of the operation switch 18 is sent to the combustion control means 17, the combustion control means 17 stops the motor 3c constituting the fuel supply means 3, and the temperature detected by the temperature detection means 19 becomes a constant temperature or less. Then, the convection fan 15 is stopped, and when the set time elapses, the combustion fan 9 is stopped.

Reference numeral 5b is an ash receiving portion arranged below the burner 5. When the pellet fuel is burned by the burner 5, it becomes ash and is discharged to the outside together with the combustion gas by the combustion fan 9, or through a hole provided on the bottom surface of the burner 5. It falls and collects in the ash receiving portion 5b. The user needs to discard the ash accumulated in the burner 5 and the ash receiving portion 5b and clean it regularly.

If the burner 5 burns continuously for a long time without cleaning the burner 5 and the ash receiving portion 5b, the ash solidifies due to non-combustible components such as water and impurities contained in the pellet fuel, and the inside of the burner 5 is used as a combustion product. The combustion products generated in the burner 5 may obstruct the flow of combustion air and further worsen the combustion, and a large amount of combustion products may be deposited in the burner 5.

In the present invention, the combustion control means 17 is provided with a removal mode for burning and removing the combustion product of the burner 5, 22 is a counting means for counting the burning time of the burner 5, and the counting means 22 is a burner. When the combustion start command of 5 is output, the combustion time count is started, the count is continued while the burner 5 is burning, and when the combustion stop command of the burner 5 is output, the combustion time count is finished. .. When the continuous combustion time of the burner 5 reaches a predetermined set time T, the combustion control means 17 starts the removal mode.

When the removal mode is started, the rotation speed of the combustion fan 9 is changed to a rotation speed obtained by adding a predetermined predetermined rotation speed n from the rotation speed N corresponding to the combustion amount P set by the combustion amount setting means 20. At this time, the rotation speed M of the motor 3c of the fuel supply means 3 remains the same, and the amount of combustion air increases with respect to the amount of fuel supplied. Therefore, when the combustion product is present in the burner 5, the combustion product is used. Can be burned.

The predetermined rotation speeds n are not the same value, but different predetermined rotation speeds n1 to n5 are set corresponding to the respective rotation speeds N1 to N5, and the rotation speeds of the combustion fan 9 in the removal mode are the respective combustion amounts P1 to. The rotation speed is changed by adding a predetermined rotation speed n1 to n5 to the rotation speeds N1 to N5 corresponding to P5. In this way, even when the removal mode is started when the amount of combustion products in the burner 5 is small, the amount of combustion air does not become too large with respect to the fuel supply amount, and the amount of combustion air in the burner 5 is not too large. There is no misfire due to running out of fuel.

As a specific configuration, the value of the predetermined rotation speed n1 at the rotation speed N1 corresponding to the minimum combustion amount P1 is set to be the smallest, and the predetermined rotation speed n2 at the rotation speed N2 corresponding to the combustion amount P2 is set. It is made larger than the predetermined rotation speed n1. Then, as the combustion amounts P2, P3, and P4 increase, the values of the predetermined rotation speeds n2, n3, and n4 also increase, and the value of the predetermined rotation speed n5 at the rotation speed N5 corresponding to the maximum combustion amount P5 becomes the largest. Is set to.

If the amount of combustion before the start of the removal mode is the minimum amount of combustion P1, the amount of fuel supplied to the burner 5 is small, so the combustion products in the burner 5 can be produced by simply increasing the amount of combustion air with respect to the amount of fuel supplied. Can be burned. Further, when the amount of combustion before the start of the removal mode is the maximum amount of combustion P5, the amount of fuel supplied to the burner 5 increases. Therefore, the amount of combustion air is greatly increased as the amount of fuel supplied increases, so that the burner The combustion product in 5 can be reliably burned.

Further, by setting the predetermined rotation speeds n1 to n5 corresponding to each combustion amount P1 to P5, when the removal mode is started and the combustion air amount is increased, the balance between the combustion air amount and the fuel supply amount is increased. Since it does not change, even if the amount of combustion products in the burner 5 is small, the amount of combustion air does not become too large with respect to the amount of fuel supplied, and it is possible to prevent the fuel in the burner 5 from running out and misfire during the removal mode. Can be done.

Further, the removal mode ends when a predetermined predetermined time elapses and returns to the normal combustion control. However, in the present invention, when the temperature detecting means 19 detects a temperature below the predetermined temperature before the predetermined time elapses, the removal mode is removed. It is configured to end the mode and return to normal combustion.

If no combustion products are generated in the burner 5, the combustion of the pellet fuel in the burner 5 is promoted, the fuel supply to the burner 5 cannot keep up, and the fuel in the burner 5 is insufficient during the removal mode. There is a risk that it will end up. When the fuel in the burner 5 is insufficient, the flame gradually becomes smaller and the combustion gas temperature drops, so that the temperature detecting means 19 detects the temperature below a predetermined temperature. If the temperature detecting means 19 detects a temperature below the predetermined temperature before the lapse of a predetermined time, the removal mode is terminated and the rotation speed of the combustion fan 5 is returned to the rotation speed N corresponding to the combustion amount P of the burner 5. Therefore, the removal mode It is possible to prevent the burner 5 from running out of fuel and misfire.

When the temperature detecting means 19 detects a temperature below a predetermined temperature during the removal mode, the temperature inside the burner 5 may have dropped, so an energization command is output to the ignition heater 13 and the inside of the burner 5 is charged. By heating the fuel, the temperature of the burner 5 is raised so that normal combustion can be reliably restored.

Further, in another embodiment of the present invention, in the removal mode, the rotation speed Nh which increases the rotation speed N of the combustion fan 9 by a predetermined rotation speed n and the rotation speed Nl which decreases the rotation speed N by a predetermined rotation speed n2. It is provided with a rotation speed change command in which one rotation speed is set and the rotation speed Nh and the rotation speed Nl are alternately and repeatedly changed at regular intervals. When the removal mode is started, the rotation speed N of the combustion fan 9 is changed to the rotation speed Nh increased by a predetermined rotation speed n, and after a certain period of time, the rotation speed is changed to Nl decreased by a predetermined rotation speed n, and then every fixed time. The rotation speed Nh and the rotation speed Nl are alternately and repeatedly changed.

In this way, when the rotation speed N of the combustion fan 9 is changed to a rotation speed Nh higher by a predetermined rotation speed n, the amount of combustion air increases with respect to the fuel supply amount of the burner 5, so that the combustion in the burner 5 occurs. It can be promoted to burn the combustion product. When the amount of combustion products in the burner 5 is small, the fuel is reduced in a short time, but when the rotation speed Nh is changed to the rotation speed Nl in a certain time, the amount of combustion air becomes smaller than the fuel supply amount and the inside of the burner 5 Since the combustion of the burner 5 is suppressed and the fuel in the burner 5 increases during this period, it is possible to prevent a misfire during the removal mode due to lack of fuel. Therefore, the combustion products in the burner 5 can be reliably burned and removed. Further, the ash in the burner 5 can be wound up by the change of the wind when the combustion fan 9 changes from the low rotation speed Nl to the high rotation speed Nh, and can be discharged together with the combustion gas, and the combustion generation in the burner 5 can be generated. It became possible to remove things.

Further, another embodiment of the present invention includes an intermittent drive command that repeats driving and stopping of the motor 3c of the fuel supply means 3 at regular intervals in the removal mode. When the removal mode is started, the rotation speed N of the combustion fan 9 is changed to a higher rotation speed by a predetermined rotation speed n, the motor 3c of the fuel supply means 3 is stopped after a certain period of time, and the fuel supply means 3 is further after a certain period of time. The motor 3c is driven, and the motor 3c of the combustion supply means 3 is repeatedly driven and stopped at regular intervals.

When the motor 3c of the fuel supply means 3 is stopped and the supply of fuel to the burner 5 is stopped, the amount of fuel in the burner 5 is reduced with respect to the amount of combustion air, so that the combustion product is easily burned. When the amount of combustion products in the burner 5 is small, the fuel is depleted in a short time, but the motor 3c of the fuel supply means 3 is driven to supply the fuel to the burner 5 in a certain time, and the fuel in the burner 5 is supplied during this period. Since the amount of fuel increased, combustion could be continued without running out of fuel and misfire, and combustion products in the burner 5 could be removed in a short time from the start of the removal mode.

Further, while the motor 3c of the fuel supply means 3 is stopped, the combustion product burns to ash and accumulates in the burner 5, but when the motor 3c resumes driving and fuel is supplied to the burner 5. , The fuel fell on the ash, the ash was rolled up, and it could be discharged together with the combustion gas, and the combustion products in the burner 5 could be removed.

Further, while the burner 5 is continuously burning, the combustion control means 17 performs the removal mode every time the counting means 22 counts the set time T, but the burner 5 is continuously burned without stopping for a long time. If combustion is continued, combustion products are likely to be generated, and even if the removal mode is performed every T for a predetermined time, the combustion products may not be completely removed in the burner 5.

In the present invention, the set time T for starting the removal mode when the count time of the counting means 22 reaches a predetermined second set time T2 is changed short, and the timing for starting the removal mode from the next time onward is shortened. By starting the removal mode before the amount of combustion products in the burner 5 increases, it has become possible to continuously burn for a long time without generating combustion products in the burner 5. It is a thing.

Further, the combustion control means 17 has an inspection mode for inspecting the burner 5, and continuously burns for a long time without stopping the combustion of the burner 5, and the continuous combustion time of the burner 5 is set to a third setting. When the time T3 is reached, the inspection mode is started. When the inspection mode is started, a combustion stop command of the burner 5 is output, the combustion control means 17 outputs a stop command to the fuel supply means 3, the motor 3c is stopped, and when the fuel supply to the burner 5 is stopped, the inside of the burner 5 is started. The flame gradually becomes smaller and extinguishes. When the combustion gas temperature drops and the temperature detected by the temperature detecting means 19 drops below a predetermined temperature, a combustion start command of the burner 5 is output, a drive command is output to the fuel supply means 3, and the motor 3c is driven. Fuel is supplied to the burner 5, the ignition heater 13 is energized, the fuel supplied to the burner 5 is ignited, and combustion is started.

The combustion control means 17 measures the time from when the combustion start command is output until the detection temperature of the temperature detection means 19 becomes equal to or higher than the predetermined temperature, and when this time is longer than the predetermined time, the combustion is continued as it is. Return to normal operation. On the other hand, when the time until the detection temperature of the temperature detecting means 19 becomes equal to or higher than the predetermined temperature is shorter than the predetermined time, the combustion stop command of the burner 5 is output and the operation is stopped. Reference numeral 23 denotes an alarm means composed of a lamp and a buzzer, and the alarm means 23 operates to notify the user of an abnormality.

The ignition heater 13 is attached at a position higher than the bottom of the burner 5, and a certain amount of fuel is supplied into the burner 5, and the ignition heater 13 is ignited when the fuel in the burner 5 reaches the height of the ignition heater 13. When the combustion product is accumulated in the burner 5, the fuel falls on the combustion product, the time until the fuel reaches the height of the ignition heater 13 is shortened, and the fuel ignites and burns earlier than usual. The time from the output of the combustion start command of the burner 5 until the temperature detecting means 19 detects the predetermined temperature or higher is also shortened.

Therefore, when the time until the temperature detecting means 19 detects the predetermined temperature or higher is shorter than the predetermined time, it means that the combustion products are accumulated in the burner 5 and cleaning is required. By stopping the combustion of the burner 5 and activating the alarm means 23 to notify the user, the user can perform cleaning and remove the combustion products accumulated in the burner 5, and the inside of the burner 5 can be removed. It is not necessary to continuously operate for a long time with the combustion products accumulated in the burner.

1 Frame 2 Fuel tank 3 Fuel supply means 4 Combustion chamber 5 Burner 9 Combustion fan 17 Combustion control means 19 Temperature detection means 20 Combustion amount setting means 22 Counting means

Claims (7)

A combustion chamber, a burner installed in the combustion chamber, a fuel supply means for transporting fuel from a fuel tank and supplying the burner, and a combustion fan for supplying combustion air to the burner are provided in the frame.
In a pellet heating device provided with a combustion control means for controlling the rotation speed of the fuel supply means and the combustion fan so as to burn at the combustion amount set by the combustion amount setting means.
The combustion control means includes a counting means for counting the burning time of the burner.
When the continuous combustion time of the burner reaches a predetermined set time, the rotation speed of the combustion fan is increased by a predetermined predetermined rotation speed from the rotation speed corresponding to the combustion amount set by the combustion amount setting means. It has a removal mode that burns the combustion products in the burner.
A control device for a pellet heating device, wherein the predetermined rotation speed in the removal mode is a rotation speed determined according to each combustion amount. The control device for a pellet heating device according to claim 1, wherein the predetermined rotation speed in the removal mode is set larger as the combustion amount set by the combustion amount setting means increases. In the removal mode, the rotation speed of the combustion fan is changed to be higher than the rotation speed corresponding to the combustion amount set by the combustion amount setting means by a predetermined predetermined rotation speed, and after a certain period of time elapses, the rotation speed is described. It is provided with a rotation speed change command that changes the rotation speed corresponding to the combustion amount set by the combustion amount setting means so as to be lower by a predetermined predetermined rotation speed and repeatedly outputs the change of the rotation speed at regular intervals. The control device for the pellet heating device according to claim 1 or 2. The pellet heating according to claim 1 or 2, wherein the removal mode includes an intermittent drive command for intermittently supplying fuel by repeating operation and stop of the fuel supply means at regular intervals. Device control device. A temperature detecting means for detecting the temperature of the combustion gas is provided in the frame.
The combustion control means is characterized in that the removal mode is terminated when the detection temperature of the temperature detecting means drops to a predetermined temperature or less before a predetermined time elapses after the removal mode is started. The control device for the pellet heating device according to any one of 4 to 4. The combustion control means according to any one of claims 1 to 5, wherein when the continuous combustion time of the burner reaches the second set time, the set time for starting the removal mode is shortened. The control device for the pellet heating device described. When the continuous combustion time of the burner reaches the third set time, the combustion control means outputs a combustion stop command of the burner, and when the detection temperature of the temperature detection means drops to a predetermined temperature or less, the burner It is characterized by having an inspection mode that outputs a combustion start command, measures the time until the detection temperature of the temperature detecting means reaches a predetermined temperature or higher, and outputs an error alarm when the temperature is shorter than the predetermined time. The control device for the pellet heating device according to any one of claims 1 to 6.

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