JP7746219B2 - Combustion machine - Google Patents

Description

This invention relates to a combustion device that burns fuel oil.

In the past, this type of device would receive a start command from the operation switch, monitor the temperature detected by the vaporization temperature sensor, and heat the vaporizer by energizing the vaporization heater until the temperature was high enough to vaporize the fuel. Once the vaporizer temperature reached a temperature suitable for combustion, the device would start driving the electromagnetic pump and combustion fan, ignite the mixed gas with an ignition device to start combustion, detect the flame with a flame rod combustion sensor, and stop energizing the vaporization heater. Additionally, depending on the deviation between the room temperature detected by a room temperature sensor located near the convection fan on the back of the device body and the set room temperature set by the room temperature setting means, the device would control the electromagnetic pump and combustion fan to vary the combustion power and maintain the room temperature set by the room temperature setting means. (See, for example, Patent Document 1.)

Japanese Patent Application Laid-Open No. 2021-469664

However, with this conventional system, when attempting to operate using a portable, rechargeable power supply unit as a power source, the combustion unit cannot operate if the power supply unit's output is smaller than the heater output of the combustion unit's vaporizing heater. Therefore, in order to enable the combustion unit to operate with a power supply unit with a lower output, it was necessary to reduce the heater output of the combustion unit's vaporizing heater.

As a result, it takes longer to raise the vaporizer temperature to a temperature suitable for combustion than with conventional combustion machines that use commercial power. Furthermore, if the amount of combustion increases at the same time as before after ignition, the increasing amount of fuel takes away the heat of vaporization, making it difficult for the vaporizer temperature to rise. This creates the problem of the vaporizer heater remaining powered even after ignition, consuming the electricity stored in the power supply.

In claim 1 , the present invention provides a combustion unit having a vaporizer for vaporizing fuel oil, vaporizer heating means for heating the vaporizer, fuel oil supply means for supplying fuel oil to the vaporizer , ignition means for igniting the fuel oil vaporized by the vaporizer, flame detection means for detecting a flame in the combustion unit, vaporizer temperature detection means for detecting the temperature of the vaporizer, an operation switch for instructing the start and stop of combustion in the combustion unit, timing means for measuring time, and a control unit for controlling combustion in the combustion unit, wherein the control unit turns on the vaporizer heating means when the temperature of the vaporizer is equal to or lower than an on temperature, and turns on the vaporizer heating means when the temperature of the vaporizer is equal to or lower than an on temperature. In an oil combustion machine that turns off the vaporizer heating means when the temperature reaches or exceeds an off temperature that is higher than the on temperature, the control unit is equipped with a short-term control that changes the combustion amount after ignition at short intervals, and a long-term control that changes the combustion amount after ignition at long intervals, and after the ignition means performs an ignition operation and the flame detection means detects a flame, when the temperature of the vaporizer reaches or exceeds the off temperature, the combustion amount is controlled by the long-term control, and thereafter, when the combustion amount reaches the maximum combustion amount and the maximum combustion amount state continues for a predetermined time, the combustion amount is controlled by the short-term control.

In claim 2 , the present invention provides a combustion unit having a vaporizer for vaporizing fuel oil, vaporizer heating means for heating the vaporizer, fuel oil supply means for supplying fuel oil to the vaporizer, ignition means for igniting the fuel oil vaporized by the vaporizer, flame detection means for detecting a flame in the combustion unit, vaporizer temperature detection means for detecting the temperature of the vaporizer, an operation switch for instructing the start and stop of combustion in the combustion unit, timing means for measuring time, and a control unit for controlling combustion in the combustion unit, wherein the control unit turns on the vaporizer heating means when the temperature of the vaporizer is equal to or lower than an on temperature, and In an oil combustion machine that turns off the vaporizer heating means when the temperature reaches or exceeds an off temperature that is higher than the on temperature, the control unit is equipped with a short-term control that changes the amount of combustion after ignition at short intervals, and a long-term control that changes the amount of combustion after ignition at long intervals, and after the ignition means performs an ignition operation and the flame detection means detects a flame, when the temperature of the vaporizer reaches or exceeds the off temperature, the combustion amount is controlled by the long-term control, and thereafter when the temperature of the vaporizer reaches a switching temperature that is higher than the off temperature, the combustion amount is controlled by the short-term control.

According to claim 1 , after the ignition means performs ignition and the flame detection means detects a flame, when the temperature of the vaporizer reaches or exceeds the off temperature, the combustion amount is controlled using long-term control, and when the combustion amount then reaches the maximum combustion amount and remains at that maximum combustion amount for a predetermined time, the combustion amount is controlled using short-term control.Therefore, when the combustion amount is increased after ignition, the temperature of the vaporizer drops temporarily, but the combustion heat is recovered and the temperature of the vaporizer is raised before the combustion amount increases further, and even if the combustion amount increases further, the temperature of the vaporizer does not drop to the on temperature, preventing the heater from being energized again due to the drop to the on temperature, and reducing power consumption due to the heater being energized again.

Furthermore, once the combustion volume reaches its maximum after ignition and remains at this maximum for a specified period of time, the vaporizer temperature becomes sufficiently high, and even if the combustion volume is controlled using short-term control, the vaporizer temperature does not drop to the on-temperature. This prevents the heater from being energized again, and allows the combustion volume to be quickly adjusted in response to changes in room temperature or set temperature.

Furthermore, according to claim 2 , after the ignition means performs ignition and the flame detection means detects a flame, when the temperature of the vaporizer reaches the off temperature or higher, the combustion amount is controlled using long-term control, and when the temperature of the vaporizer then reaches a switching temperature higher than the off temperature, the combustion amount is controlled using short-term control.Therefore, when the combustion amount is increased after ignition, the temperature of the vaporizer drops once, but the combustion heat is recovered and the temperature of the vaporizer is raised before the combustion amount increases further, and even if the combustion amount increases further, the temperature of the vaporization section does not drop to the on temperature, preventing the heater from being energized again due to the temperature dropping to the on temperature, and reducing power consumption due to the heater being energized again.

Furthermore, once the vaporizer temperature reaches a switching temperature higher than the off temperature after ignition, the vaporizer temperature becomes sufficiently high, and even if the combustion amount is controlled using short-term control, the vaporizer temperature does not drop to the on temperature. This prevents the heater from being energized again, and allows the combustion amount to be quickly changed in response to changes in room temperature or set temperature.

1 is a cross-sectional view of a combustion unit according to an embodiment of the present invention. The same configuration diagram. FIG. FIG.

Next, an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes the main body of the combustion unit, which is provided inside the main body 1 and comprises a burner 2 which is the combustion part that performs the combustion, a control unit 3 which is mainly composed of a microcomputer that controls the operation of this combustion unit, a convection fan 4 which is a blower that is provided at the opening on the back of the main body 1 and discharges the combustion gas from the burner 2 into the room, a hot air outlet 5 on the front of the main body 1, and an operation unit 6 on the upper front side of the main body 1, and heating is performed by blowing the combustion gas from the burner 2 into the room using the convection fan 4 from the hot air outlet 5.

The burner 2 is configured with a vaporizer 9 equipped with a vaporizer heater 8, which serves as a vaporizer heating means, located below a burner head 7 with multiple flame holes. Liquid fuel is supplied from an oil pan 10 into the vaporizer 9, heated by the vaporizer heater 8, through an oil supply nozzle 12 driven by a positive displacement electromagnetic pump 11, which serves as a fuel supply means. The vaporized gas produced by this liquid fuel is mixed with combustion air supplied through an air duct 14 from a combustion fan 13, which serves as a combustion blower, and is combusted in the flame holes of the burner head 7. During combustion, heat is recovered from the flame by an annular heat recovery ring 15 located at the upper end of the vaporizer 9 facing the multiple flame holes, reducing the current flow to the vaporizer heater 8. This results in a wide turndown ratio and quiet vaporization combustion.

The operating unit 6 is equipped with an operation switch 16 for starting/stopping operation, a room temperature setting means 19 consisting of a room temperature increase switch 17 and a room temperature decrease switch 18 for setting the desired room temperature, various operation switches such as a timer switch and a preheat standby switch, and a display unit 20 that displays the time and set room temperature.

21 is a vaporization temperature sensor, which is a vaporizer temperature detection means that detects the temperature of the vaporizer 9 heated by the vaporization heater 8. The control unit 3 turns off the vaporization heater 8 when the temperature detected by this vaporization temperature sensor 21 reaches a predetermined upper limit temperature, and turns on the vaporization heater 8 when it reaches a predetermined lower limit temperature, thereby maintaining the temperature of the vaporizer 9 within a temperature range in which the liquid fuel can be vaporized well.

Furthermore, in response to an operation start command from the operation switch 16, the control unit 3 monitors the temperature detected by the vaporization temperature sensor 21 and heats the vaporizer 9 using the vaporization heater 8 to a temperature at which the liquid fuel can be vaporized. Once the temperature of the vaporizer 9 has been raised to a temperature suitable for combustion, it starts driving the electromagnetic pump 11 and combustion fan 13, ignites the mixed gas using the discharge electrode 22, which serves as ignition means, to start combustion, detects the flame using the combustion sensor 23, which consists of a flame rod, which serves as flame detection means, and controls the electromagnetic pump 11 and combustion fan 13 to vary the combustion power depending on the deviation between the room temperature detected by the room temperature sensor 24, located near the convection fan 4 on the back of the device main body 1, and the set room temperature set by the room temperature setting means 19, thereby controlling the room temperature to match the room temperature set by the room temperature setting means 19.

The control unit 3 also has a timer unit 25, which is a timekeeping means. When the timer unit 25 receives a timekeeping start signal from the control unit 3, it starts timing and outputs the time being counted to the control unit 3. When the timer unit 25 receives a timekeeping stop signal from the control unit 3, it stops timing and resets.

Furthermore, when the control unit 3 receives an operation stop command from the operation switch 16, it appropriately controls the convection fan 4, vaporization heater 8, electromagnetic pump 11, and combustion fan 13 to extinguish fires in accordance with the count of the timer means 25, achieving comfortable fire extinguishing without odor or smoke. When the combustion sensor 23 detects incomplete combustion, it starts timing and stops timing after a predetermined time has elapsed.

26 is a hollow cylindrical metal flame tube that encloses the upper part of the burner 2. It stabilizes combustion by preventing the air from the convection fan 4 from directly hitting the flame-forming part at the top of the burner 2, and also prevents the flame from being fanned by the air from the convection fan 4 and blowing out of the hot air outlet 5.

Next, the operation of this embodiment will be described with reference to the flow chart of FIG.
First, the control unit 3 determines whether the operation switch 16 of the operation unit 6 has been turned on (S1).
When it is determined that the operation switch 16 has been turned ON, it is then determined whether the vaporizer temperature of the vaporizer 9 is below the ignition temperature at which ignition is possible (S2), and if the vaporizer temperature is below the ignition temperature, power is started to be supplied to the vaporization heater 8 of the burner 2 (S3).
In this embodiment, the ignition temperature is set to 200°C.

?Then, when the vaporizer temperature reaches or exceeds the ignition temperature (S4), the control unit 3 drives the combustion fan 13 (S5) and drives the electromagnetic pump 11 (S5), supplying fuel oil and combustion air to the vaporizer 9 to generate a mixed gas, and ignites the mixed gas with the discharge electrode 22 (S7), starting combustion.

?Then, if the detection value by the combustion sensor 23 using the flame rod is equal to or greater than the ignition judgment value (S8), the control unit 3 determines that a flame has been detected and sets long-term control, which sets the interval for changing the combustion amount to a long time (S9).
In this embodiment, the long time is set to 15 seconds.

Next, the convection fan 4 is driven (S10).
Next, control unit 3 determines whether the vaporizer temperature is equal to or higher than the OFF temperature at which power supply to vaporization heater 8 is stopped (S11), and if the vaporizer temperature is equal to or higher than the OFF temperature at which power supply to vaporization heater 8 is stopped, it determines that the temperature of vaporizer 9 is sufficiently high and stops power supply to vaporization heater 8 (S12).
In this embodiment, the off temperature is set to 260° C., which is higher than the on temperature, which will be described later.
Then, when the vaporizer temperature reaches or exceeds the off temperature of 260°C, power supply to the vaporization heater 8 is stopped, and then when the vaporizer temperature reaches or exceeds the on temperature of 230°C, power supply to the vaporization heater 8 is started, and when the vaporizer temperature reaches or exceeds the off temperature of 260°C, power supply to the vaporization heater 8 is stopped, and this control is repeated thereafter.

Then, the control unit 3 outputs a time count start signal to the timer means 25, and the timer means 25 starts counting time (S13).
Then, when the time counted by timer means 25 reaches the long time set in the long-time control (15 seconds in this embodiment) (S14), control unit 3 determines that heat recovery through combustion has been sufficient, even though power supply to vaporization heater 8 has stopped, and outputs a time count stop signal to timer means 25 to stop and reset timer means 25 (S15), and increase the combustion amount by one step (S16).

Next, the control unit 3 determines whether the increased combustion amount is the maximum combustion amount (S17), and if it is not the maximum combustion amount (S13), it outputs a time count start signal to the timer means 25, causing the timer means 25 to start counting (S18).
By increasing the combustion amount to the maximum combustion amount, the area around the burner 2, the burner head 7 of the burner 2, and the heat recovery ring 15 can be sufficiently heated, and the temperature even reaches the inside of the vaporizer 9, resulting in sufficient heat storage.

When the combustion amount is increased one step in (S16), the amount of fuel oil supplied to the vaporizer 9 increases, and the increased amount of fuel oil takes away the heat of vaporization, causing the vaporizer temperature to drop.
Therefore, if the increased combustion amount is not the maximum combustion amount, the control unit 3 returns to (S13) and continues combustion at the increased combustion amount for the long period set in the long-term control.

As a result, the combustion amount increases by one step, and more heat of vaporization of the fuel is taken away than before the combustion amount was increased by one step, but the heat recovery through combustion also increases, causing the vaporizer temperature to gradually decrease, and when the long period set in the long-term control has elapsed, the increased heat recovery is sufficiently returned to the vaporizer 9, and the decrease in the vaporizer temperature stops and it does not decrease to the on temperature at which power begins to be supplied to the vaporization heater 8.
In this embodiment, the on-temperature is set to 230° C., which is higher than the ignition temperature.

Then, after the timer means 25 starts timing in (S18), when the timer means 25's timing time reaches the preset control switching time period (20 seconds in this embodiment) (S19), the control unit 3 determines that even if the combustion amount is increased in a short period of time, the vaporizer temperature will be high enough not to fall below the on temperature, and that sufficient heat recovery is possible, and sets the interval for changing the combustion amount to short-term control, which is the short interval for changing the combustion amount in normal temperature control (S20).
In this embodiment, the short time is set to 4 seconds.

Then, the control unit 3 outputs a timing stop signal to the timer means 25 to stop and reset the timer means 25 (S21), and starts normal temperature control (S22).

As described above, during normal operation when the temperature of the vaporizer 9 is sufficiently high, when the combustion amount is increased, the interval at which the combustion amount is changed is set to a short time using short-term control, thereby quickly increasing the combustion amount. However, when the combustion amount is increased after ignition, the interval at which the combustion amount is changed is set to a long time using long-term control. This allows for sufficient heat recovery through combustion, and the temperature of the vaporizer 9 stops dropping before the combustion amount is increased. This prevents the vaporizer heater 8 from remaining energized or being energized frequently, even when a low-output vaporizer heater 8 is used. It also prevents the vaporizer heater 8 from being energized after ignition or from consuming the power stored in the power supply, even when a portable battery-type power supply is used.

Next, the operation of another embodiment will be described with reference to the flow chart of FIG.
Since steps (S1) to (S16) are the same as those in the above-described embodiment, the explanation will be omitted.
Therefore, after increasing the combustion amount by one step in (S16), the control unit 3 determines whether the vaporizer temperature is equal to or higher than the threshold temperature (S23).
In this embodiment, the switching temperature is set to 280° C., which is higher than the off temperature.

When the vaporizer temperature is above the switching temperature, the vaporizer temperature will be so high that it will not fall below the on-temperature even if the combustion amount is increased in a short period of time, and the controller 3 determines that sufficient heat recovery is possible. It then sets short-term control, which sets the interval for changing the combustion amount to the short time interval used in normal temperature control (S24), and starts normal temperature control (S25).

Also, if the vaporizer temperature is below the switching temperature in (S23), the control unit 3 determines whether the combustion amount is the maximum combustion amount (S26). If it is not the maximum combustion amount, it returns to (S13). If it is the maximum combustion amount, it proceeds to (S24), sets short-time control, which sets the interval for changing the combustion amount to the short time interval used in normal temperature control, and starts normal temperature control (S25).

As described above, if the vaporizer temperature reaches or exceeds the switching temperature, which is higher than the off temperature, before the combustion is increased to the maximum combustion amount after ignition, the interval at which the combustion amount is changed is set to short-term control, which is the short interval used in normal temperature control.This means that normal temperature control can be started sooner than if long-term control were used to change the combustion amount until the combustion amount reaches the maximum combustion amount.

Furthermore, if the vaporizer temperature does not reach a switching temperature higher than the off temperature after ignition, the interval at which the combustion amount is changed is controlled over a long period of time until the combustion amount reaches the maximum combustion amount.This allows sufficient heat recovery through combustion, raises the temperature of the vaporizer 9, and then increases the combustion amount.Even if a low-output vaporizer heater 8 is used, it prevents the vaporizer heater 8 from remaining powered or from frequently becoming powered.Even if a portable battery-type power supply is used as the power source, it prevents the vaporizer heater 8 from being powered on after ignition and consuming the power stored in the power supply.

2 Burner (combustion part)
3 Control unit 8 Vaporization heater (vaporizer heating means)
9 Carburetor 11 Electromagnetic pump (fuel supply means)
21 Vaporization temperature sensor (vaporizer temperature detection means)
22 Discharge electrode (ignition means)
23 Combustion sensor (flame detection means)

Claims (2)

The present invention is provided with a combustion section having a vaporizer for vaporizing fuel oil, vaporizer heating means for heating the vaporizer, fuel oil supply means for supplying fuel oil to the vaporizer , ignition means for igniting the fuel oil vaporized by the vaporizer, flame detection means for detecting a flame in the combustion section, vaporizer temperature detection means for detecting the temperature of the vaporizer, an operation switch for instructing the start and stop of combustion in the combustion section, timing means for measuring time, and a control section for controlling combustion in the combustion section, wherein the control section turns on the vaporizer heating means when the temperature of the vaporizer is equal to or lower than an on temperature, and turns on the vaporizer heating means when the temperature of the vaporizer is higher than the on temperature. In an oil combustion machine that turns off the vaporizer heating means when the temperature reaches a high off-temperature or higher, the control unit is equipped with short-term control that changes the combustion amount after ignition at short intervals and long-term control that changes the combustion amount after ignition at long intervals, and is characterized in that after the ignition means performs ignition operation and the flame detection means detects a flame, when the temperature of the vaporizer reaches the off-temperature or higher, the combustion amount is controlled by the long-term control, and thereafter, when the combustion amount becomes the maximum combustion amount and that maximum combustion amount state continues for a predetermined time, the combustion machine controls the combustion amount by the short-term control. The present invention is provided with a combustion unit having a vaporizer for vaporizing fuel oil, vaporizer heating means for heating the vaporizer, fuel oil supply means for supplying fuel oil to the vaporizer , ignition means for igniting the fuel oil vaporized by the vaporizer, flame detection means for detecting a flame in the combustion unit, vaporizer temperature detection means for detecting the temperature of the vaporizer, an operation switch for instructing the start and stop of combustion in the combustion unit, timing means for measuring time, and a control unit for controlling combustion in the combustion unit, wherein the control unit turns on the vaporizer heating means when the temperature of the vaporizer is equal to or lower than an on temperature, and turns on the vaporizer heating means when the temperature of the vaporizer is equal to or lower than the on temperature. In an oil combustion machine that turns off the vaporizer heating means when the temperature reaches or exceeds an off temperature higher than the off temperature, the control unit is equipped with a short-term control that changes the combustion amount after ignition at short intervals and a long-term control that changes the combustion amount after ignition at long intervals, and is characterized in that after the ignition means performs an ignition operation and the flame detection means detects a flame, when the temperature of the vaporizer reaches or exceeds the off temperature, the combustion amount is controlled by the long-term control, and thereafter when the temperature of the vaporizer reaches a switching temperature higher than the off temperature, the combustion amount is controlled by the short-term control.