Oil combustion device

Abstract

To provide a petroleum burner that corrects a fuel flow rate to a suitable one at a low cost.SOLUTION: The petroleum burner comprises a burner unit 17, an electromagnetic pump 12 supplying fuel oil, room-temperature detection means 23, and a controller 19. The controller 19 determines a correction value according to a detection value detected by the room-temperature detection means 23 when a combustion operation is started and corrects a flow rate of oil supplied by the electromagnetic pump 12 according to the correction value. The controller 19 revises the correction value according to the progress of the combustion operation subsequent to the start of the combustion operation, and hence determines a correction value for correcting the flow rate of oil supplied by the electromagnetic pump 12 according to the detection value detected by the room-temperature detection means 23 since the ambient temperature of the electromagnetic pump 12 at a time when the combustion operation is started is equal to the room temperature, so as to adjust the flow rate of the electromagnetic pump 12 to a preset one at a low cost without increasing the number of components.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This invention relates to an oil combustion device.

Background Art

[0002] Conventionally, an electromagnetic pump used for fuel supply in an oil combustion device reciprocates a free piston-shaped plunger housed in a cylinder by an electromagnetic force generated by intermittently passing a pulsed current through an electromagnetic coil, and returns by a spring pressure, and discharges the fuel oil while pushing open a discharge check valve by the pressure of the fuel oil pressurized during this reciprocation.

[0003] Also, the electromagnetic pump is adjusted so that the actual discharge amount becomes the set discharge amount at the ambient temperature during normal operation, for example, when the ambient temperature is around 20°C. However, the usage environment of the oil combustion device is not always constant, and in some regions, the ambient temperature at the start of combustion operation in winter may be -5°C or lower. In this case, the viscosity of the fluid increases with temperature, and the resistance of the electromagnetic coil of the electromagnetic pump decreases, resulting in a problem that the actual discharge amount becomes more than the set discharge amount.

[0004] Therefore, a discharge amount adjusting resistor connected in series to the electromagnetic coil of the electromagnetic pump is provided, and a negative characteristic temperature detecting thermistor is connected in parallel to the discharge amount adjusting resistor so that the discharge amount of the electromagnetic pump decreases as the detected temperature decreases. (For example, refer to Patent Document 1.)

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, in this conventional device, in an oil combustion device that includes room temperature detection means for detecting the room temperature and performs heating by burning fuel oil in the combustion section so that the room temperature reaches the set temperature, when an electromagnetic pump is used as the fuel oil supply means, when starting the combustion operation from the stopped state, since the room temperature and the temperature inside the device are the same, a correction value is determined using the temperature detected by the room temperature detection means as the ambient temperature of the electromagnetic pump, and the amount of fuel oil supplied by the electromagnetic pump is corrected by that correction value. However, after starting the combustion operation, as the temperature inside the device gradually rises and the temperature difference between the room temperature and the temperature inside the device increases, if a correction value is determined using the temperature detected by the room temperature detection means as the ambient temperature of the electromagnetic pump and the amount of fuel oil supplied by the electromagnetic pump is corrected by that correction value, the correction amount will not be appropriate, and a problem will occur where the combustion becomes unstable.

[0007] Therefore, in order to solve that problem, when providing electromagnetic pump temperature detection means for detecting the ambient temperature of the electromagnetic pump, there is a problem that the cost increases. The present invention has been made in view of such points, and an object thereof is to realize correction to an appropriate fuel oil discharge amount at low cost.

Means for Solving the Problem

[0008] In order to solve the above problems, in claim 1 of the present invention, there are provided a combustion section, an electromagnetic pump for supplying fuel oil to the combustion section, room temperature detection means for detecting the room temperature, Preliminary combustion that burns for a predetermined time at a heat level between low heat and medium heat, and main combustion that performs automatic operation in which the heat level fluctuates based on the room temperature or manual operation at a desired heat level. and a control section for controlling the combustion operation. The control section determines a correction value based on the detection value of the room temperature detection means at the start of the combustion operation, and corrects the amount of fuel oil supplied by the electromagnetic pump by the correction value. In the oil combustion device, the control section After the preliminary combustion ends and the process shifts to the main combustion, the detected value of the room temperature detection means modifies the correction value based on.

[0009] Further, in claim 2, the control section 、 modifies the correction value in the direction of increasing the amount of fuel oil.

[0010] Further, in claim 3, when the elapsed time from the start of the combustion operation exceeds a predetermined time, the control section The preliminary combustion ends. It corrects the correction value in the fuel quantity increasing direction.

[0011] Also, in claim 4, the control unit accumulatively stores the number of driving times of the electromagnetic pump from the start of the combustion operation, and when the accumulatively stored number of driving times of the electromagnetic pump exceeds a predetermined value, The preliminary combustion ends. It corrects the correction value in the fuel quantity increasing direction.

Advantages of the Invention

[0012] According to claim 1 of this invention, After performing preliminary combustion that burns for a predetermined time at a heat level between low heat and medium heat, the combustion operation is advanced to the main combustion of automatic operation in which the heat level fluctuates based on the room temperature or manual operation at a desired heat level. At the start of the combustion operation, a correction value is determined based on the detection value of the room temperature detection means, and the fuel quantity supplied by the electromagnetic pump is corrected by the correction value. At the same time, After the preliminary combustion ends and the process shifts to the main combustion, the detected value of the room temperature detection means Since the correction value is corrected based on this, the ambient temperature of the electromagnetic pump at the start of the combustion operation is the same as the room temperature. Therefore, a correction value for correcting the fuel quantity supplied by the electromagnetic pump based on the detection value of the room temperature detection means is determined, and the discharge amount of the electromagnetic pump can be adjusted to the set discharge amount.

[0013] Also, since the ambient temperature of the electromagnetic pump rises due to combustion from the start of the combustion operation, and the discharge amount of the electromagnetic pump changes accordingly, the correction value is corrected based on the progress of the operation from the start of the combustion operation. Therefore, even if the temperature difference between the room temperature and the temperature inside the device becomes large, the discharge amount of the electromagnetic pump can be adjusted to the set discharge amount without newly providing an electromagnetic pump temperature detection means for detecting the ambient temperature of the electromagnetic pump.

[0014] Also, according to claim 2 、 Since the correction value is corrected in the fuel quantity increasing direction, it is determined that the temperature difference between the room temperature and the temperature inside the device has become large due to the transition of the combustion state to the preliminary combustion after ignition and the subsequent main combustion, and the correction value is corrected so that the discharge amount of the electromagnetic pump increases. Without newly providing an electromagnetic pump temperature detection means for detecting the ambient temperature of the electromagnetic pump, the discharge amount of the electromagnetic pump can be adjusted to the set discharge amount.

[0015] Also, in claim 3, when the elapsed time from the start of the combustion operation exceeds a predetermined time,The preliminary combustion ends. Since the correction value is corrected in the fuel quantity increasing direction, when a predetermined time has elapsed after ignition and it is determined that the temperature difference between the room temperature and the temperature inside the apparatus has increased, the correction value is corrected so that the discharge amount of the electromagnetic pump increases, and the discharge amount of the electromagnetic pump can be adjusted to the set discharge amount without newly providing electromagnetic pump temperature detection means for detecting the temperature around the electromagnetic pump.

[0016] Further, in claim 4, the number of driving times of the electromagnetic pump from the start of the combustion operation is accumulated and stored, and when the accumulated number of driving times of the electromagnetic pump exceeds a predetermined value, the correction value is corrected in the fuel quantity increasing direction. Therefore, when the cumulative value of the number of driving times of the electromagnetic pump exceeds the predetermined value, The preliminary combustion ends. it is determined that the temperature difference between the room temperature and the temperature inside the apparatus has increased, the correction value is corrected so that the discharge amount of the electromagnetic pump increases, and the discharge amount of the electromagnetic pump can be adjusted to the set discharge amount without newly providing electromagnetic pump temperature detection means for detecting the temperature around the electromagnetic pump.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0018] Next, an embodiment to which this invention is applied will be described with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes an oil combustion apparatus that performs heat exchange with indoor air by blowing air to a heat exchanger 2 heated by combustion gas inside with a convection fan 3 and discharges warm air from a blowout port 4 into the indoor space.

[0019] 5 is a supply and exhaust pipe with a double-pipe structure that penetrates the wall 6 and is equipped with a supply air pipe 7 for taking in outdoor air inside and an exhaust pipe 8 for discharging the low-temperature combustion gas heat-exchanged in the heat exchanger 2 to the outside. 9 is a combustion fan that blows the outdoor air taken in by the supply air pipe 7 into the combustion cylinder 10 as combustion air.

[0020] ??11 is an oil leveler that stores fuel oil at a constant oil level, and the electromagnetic pump 12 pumps up the fuel oil and supplies it from the supply pipe 13 to the vaporization section 14 at the lower part of the combustion cylinder 10.

[0021] ?15 is a pot thermistor composed of a temperature sensor attached to the bottom back surface of the vaporization section 14. When monitoring the temperature inside the vaporization section 14 and preheating or heating operations are required, it issues an instruction to the pot heater 16 composed of a rod-shaped ceramic heater to set the inside of the vaporization section 14 to an appropriate temperature.

[0022] ??17 is a combustion section located at the lower part of the combustion cylinder 10 with the vaporization section 14 installed inside at the bottom. It mixes the fuel oil gasified in the vaporization section 14 and the combustion air uniformly and ignites them to perform combustion and discharge the combustion gas.

[0023] ? 18 is a flame detection means, which consists of a flame rod installed so as to touch the flame generated in the combustion section 17. It detects the flame rod voltage generated by the current flowing through the flame, and based on the detection level, it judges abnormalities such as ignition failure, in-flight fire extinction, or oxygen deficiency and stops the combustion.

[0024] ? Then, the indoor air taken into the oil combustion device 1 by the convection fan 3 is heated by the heat exchanger 2, becomes warm air, and is discharged into the room from the outlet 4.

[0025] ?19 is a control unit composed of a microcomputer equipped with a CPU, memory, timer, input / output circuit, etc. and installed below the heat exchanger 2. 20 is an operation unit, which is equipped with an operation switch 21 for instructing the start and end of the combustion operation. 22 is a display unit, which is provided integrally with the operation unit 20.

[0026] 23 is a room temperature detection means consisting of a room thermostat, which detects the room temperature. 24 is a timer unit, which starts timing according to a start timing signal from the control unit 19, outputs the timing time to the control unit 19, stops timing according to a stop timing signal from the control unit 19, and resets the timed timing time according to a reset signal.

[0027] Next, the correction control of the fuel quantity supplied by the electromagnetic pump from the start of the combustion operation will be described with reference to FIG. 3. First, when the operation switch 21 is turned on (S1), the control unit 19 determines whether the room temperature detected by the room temperature detection means 23 is less than -5°C. (S2)

[0028] And if it is determined in (S2) that the room temperature is less than -5°C, it is judged that the peripheral temperature of the electromagnetic pump 12 is also as low as less than -5°C, and the fuel quantity discharged by the electromagnetic pump 12 will be much more than the set fuel quantity, and a correction value for correcting the fuel quantity supplied by the electromagnetic pump 12 is set to -10%. (S3)

[0029] The above-mentioned set fuel quantity is determined based on the state where the main combustion described later is stable, that is, the peripheral temperature of the electromagnetic pump 12 is higher than the room temperature, and a predetermined temperature difference exists between the room temperature and the peripheral temperature of the electromagnetic pump 12. The correction value is corrected so that the set fuel quantity for control decreases as the room temperature decreases, and is predetermined so that the fuel quantity actually discharged from the electromagnetic pump 12 becomes the target fuel quantity.

[0030] Then, the control unit 19 performs preheating to heat the vaporization unit 14 at the lower part of the combustion cylinder 10 by the pot heater 16. (S4)

[0031] Also, if it is determined in (S2) that the room temperature is -5°C or higher, then it is determined whether the room temperature is 15°C or higher. (S5) When it is determined in (S5) that the room temperature is 15°C or higher, it is determined that the temperature around the electromagnetic pump 12 is also as high as 15°C or higher, and when the amount of oil discharged by the electromagnetic pump 12 becomes the same as the set amount of oil, a correction for correcting the amount of oil supplied by the electromagnetic pump 12 is set without making a correction (S6), and the process proceeds to (S4).

[0032] Also, when it is determined in (S5) that the room temperature is less than 15°C, the room temperature is -5°C or higher and less than 15°C, the temperature around the electromagnetic pump 12 is also -5°C or higher and less than 15°C, and it is determined that the amount of oil discharged by the electromagnetic pump 12 becomes slightly more than the set amount of oil. A correction value for correcting the amount of oil supplied by the electromagnetic pump 12 is set to -6% (S7), and the process proceeds to (S4).

[0033] Then, the control unit 19 causes the timer unit 24 to measure time. When the measured time reaches the preheating completion time, and in this embodiment, when the measured time reaches 90 seconds, it is determined that the vaporization unit 14 has reached the combustion start temperature, and the preheating is terminated. The fuel oil in the oil leveler 11 is supplied to the vaporization unit 14 by the electromagnetic pump 12, and combustion air is supplied from the combustion fan 9 into the combustion unit 17 to perform an ignition operation.

[0034] Then, the fuel oil supplied to the vaporized unit 14 that has become hot is ignited by the heat of the pot heater 16. (S8) When the control unit 19 detects ignition by the flame detection means 18, in order to stabilize the combustion state, the ignition operation is terminated and pre-combustion is performed. (S9)

[0035] As pre-combustion, the control unit 19 first causes the timer unit 24 to measure time, and continues the first pre-combustion with low firepower for the first pre-combustion time. In this embodiment, when the measured time reaches 80 seconds, the first pre-combustion is terminated. Subsequently, after resetting the timer unit 24, it is measured again, and the second pre-combustion with medium firepower is performed for the second pre-combustion time. In this embodiment, when the measured time reaches 160 seconds, the second pre-combustion is terminated, and the pre-combustion is terminated. Then, when it is determined that the combustion state can continue stably, the combustion operation is advanced to the main combustion of the automatic operation in which the heating power fluctuates based on the room temperature or the manual operation of the desired heating power. (S10)

[0036] Then, the control unit 19 determines again whether the room temperature detected by the room temperature detection means 23 is less than -5°C. (S11) If it is determined in (S11) that the room temperature is less than -5°C, although the room temperature is low, it is determined that the peripheral temperature of the electromagnetic pump 12 has risen above the room temperature due to the combustion from ignition to the end of pre-combustion. Thereby, it is determined that the difference between the fuel quantity discharged by the electromagnetic pump 12 and the set fuel quantity has become small, and a correction value for correcting the fuel quantity supplied by the electromagnetic pump 12 is set to -6%. (S12)

[0037] When the control unit 19 determines that the main combustion is stable based on the detection value of the flame detection means 18 (S13), it then determines whether the room temperature detected by the room temperature detection means 23 is 5°C or higher. (S14)

[0038] If it is determined in (S14) that the room temperature detected by the room temperature detection means 23 is 5°C or higher, it is determined that the peripheral temperature of the electromagnetic pump 12 has risen sufficiently due to the combustion from ignition to the stabilization of the main combustion at the room temperature. Thereby, it is determined that correction of the fuel quantity discharged by the electromagnetic pump 12 is unnecessary, and the correction of the fuel quantity supplied by the electromagnetic pump 12 is set without correction (S15), and the main combustion is continued. (S16)

[0039] Also, if it is determined in (S11) that the room temperature is -5°C or higher, it is then determined whether the room temperature is 15°C or higher. (S17) If it is determined in (S17) that the room temperature is 15°C or higher, it is determined that the peripheral temperature of the electromagnetic pump 12 is also as high as 15°C or higher and the fuel quantity discharged by the electromagnetic pump 12 becomes the same as the set fuel quantity, and the process proceeds to (S15).

[0040] Further, if it is determined in (S17) that the room temperature is less than 15°C and less than 15°C, although the room temperature is -5°C or more and less than 15°C, it is determined that the ambient temperature around the electromagnetic pump 12 has risen due to the combustion from ignition until the main combustion stabilizes. Accordingly, it is determined that the difference between the amount of fuel discharged by the electromagnetic pump 12 and the set amount of fuel has become quite small, and a correction value for correcting the amount of fuel supplied by the electromagnetic pump 12 is set to -3% (S18), and the process proceeds to (S13).

[0041] As described above, the correction value is determined based on the detected value of the room temperature detection means 23 at the start of the combustion operation, and the amount of fuel supplied by the electromagnetic pump 12 is corrected by the correction value. Therefore, at the start of the combustion operation, the room temperature and the ambient temperature around the electromagnetic pump 12 are the same, and it becomes a correction value corresponding to the ambient temperature around the electromagnetic pump 12, and the amount of fuel discharged by the electromagnetic pump 12 can be adjusted to be the set amount of fuel.

[0042] Further, since the ambient temperature around the electromagnetic pump 12 rises due to the combustion from the start of the combustion operation, and thereby the amount of fuel discharged by the electromagnetic pump 12 changes, the correction value is corrected in the fuel amount increasing direction based on the progress of the operation from the start of the combustion operation. Therefore, even if the progress of the operation from the start of the combustion operation advances and the temperature difference between the room temperature and the temperature inside the apparatus gradually increases, the amount of fuel discharged by the electromagnetic pump 12 can be adjusted to be the set amount of fuel without newly providing an electromagnetic pump temperature detection means for detecting the ambient temperature around the electromagnetic pump 12.

[0043] The above-described progress of the operation means the current state of progress of the combustion state during the transition of the combustion state from ignition detected by the flame detection means 18 to the first pre-combustion, the second pre-combustion, and then the main combustion.

[0044] Next, a second embodiment of the present invention will be described with reference to FIG. 4. Note that the same step numbers are used for the same steps as those in the first embodiment shown in FIG. 3. In this embodiment, ignition is performed in (S8), and when the control unit 19 detects ignition by the flame detection means 18, the timer unit 24 starts timing. (S19)

[0045] Then, when the elapsed time of the timer unit 24 reaches the predetermined combustion time (S20), the control unit 19 proceeds to (S11). This predetermined combustion time is the sum of the combustion time of the first preliminary combustion and the combustion time of the second preliminary combustion. In this embodiment, it is set to 240 seconds, which is the sum of 80 seconds of the combustion time of the first preliminary combustion and 160 seconds of the combustion time of the second preliminary combustion. However, it is not limited to this, and the time until the peripheral temperature of the electromagnetic pump 12 rises above room temperature may be determined in advance by tests or the like.

[0046] In this second embodiment, the preliminary combustion is completed when the elapsed time from the start of the combustion operation reaches the predetermined time. It is determined that the peripheral temperature of the electromagnetic pump 12 has risen due to the preliminary combustion, and the temperature difference between room temperature and the temperature inside the device has increased.

[0047] Then, the room temperature is detected again, and by correcting the correction value of the electromagnetic pump 12 in the fuel quantity increasing direction based on the detected room temperature, it is possible to adjust the fuel quantity discharged by the electromagnetic pump 12 to the set fuel quantity without newly providing electromagnetic pump temperature detection means for detecting the peripheral temperature of the electromagnetic pump 12.

[0048] Next, a third embodiment of the present invention will be described with reference to FIG. 5. Note that the same step numbers as those in the first embodiment shown in FIG. 3 are used for the same steps. In this embodiment, ignition is performed in (S8). When the control unit 19 detects ignition by the flame detection means 18, it starts counting the number of driving times of the electromagnetic pump 12. (S21)

[0049] The counting of the number of driving times of the electromagnetic pump 12 is performed, for example, by counting the number of driving pulses for driving the electromagnetic pump 12. Then, when the counted number of driving times of the electromagnetic pump 12 reaches the predetermined value, which is the number of times at the end of the preliminary combustion (S22), the process proceeds to (S11).

[0050] This number of times of pre - combustion completion is the sum of the number of driving times of the electromagnetic pump 12 required to continue the first pre - combustion with low heat for the first pre - combustion time and the number of driving times of the electromagnetic pump 12 required to continue the second pre - combustion with medium heat for the second pre - combustion time.

[0051] In this embodiment, the number of times of pre - combustion completion is the sum of the number of driving times of the electromagnetic pump 12 for the first pre - combustion to continue low heat for 80 seconds and the number of driving times of the electromagnetic pump 12 for the second pre - combustion to continue medium heat for 160 seconds. However, it is not limited to this. The number of driving times of the electromagnetic pump 12 until the peripheral temperature of the electromagnetic pump 12 rises above room temperature may be determined in advance by tests or the like.

[0052] In this third embodiment, the pre - combustion is completed when the number of driving times of the electromagnetic pump 12 from the start of combustion operation reaches the number of times of pre - combustion completion which is a predetermined number of times. It is determined that the peripheral temperature of the electromagnetic pump 12 has risen due to the pre - combustion and the temperature difference between room temperature and the temperature inside the device has become large.

[0053] Then, the room temperature is detected again, and by correcting the correction value of the electromagnetic pump 12 in the fuel - quantity increasing direction according to the detected room temperature, it is possible to adjust the fuel quantity discharged by the electromagnetic pump 12 to the set fuel quantity without newly providing an electromagnetic - pump temperature - detecting means for detecting the peripheral temperature of the electromagnetic pump 12.

Explanation of symbols

[0054] 12 Electromagnetic pump 17 Combustion part 19 Control part 23 Room - temperature detecting means

Claims

1. An oil combustion apparatus comprising a combustion section, an electromagnetic pump for supplying fuel oil to the combustion section, room temperature detection means for detecting room temperature, preliminary combustion for burning for a predetermined time at a heating power between low heating power and medium heating power, main combustion for performing automatic operation in which the heating power varies based on the room temperature or manual operation at a desired heating power, and a control section for controlling the combustion operation. The control section determines a correction value based on the detection value of the room temperature detection means at the start of the combustion operation, and corrects the amount of fuel oil supplied by the electromagnetic pump with the correction value. In the oil combustion apparatus, the control section corrects the correction value based on the detection value of the room temperature detection means after the preliminary combustion ends and the operation shifts to the main combustion.

2. The oil combustion apparatus according to claim 1, wherein the control section corrects the correction value in the direction of increasing the amount of fuel oil.

3. The oil combustion apparatus according to claim 1, wherein when the elapsed time from the start of the combustion operation exceeds a predetermined time, the control section ends the preliminary combustion and corrects the correction value in the direction of increasing the amount of fuel oil.

4. The oil combustion apparatus according to claim 1, wherein the control section accumulatively stores the number of driving times of the electromagnetic pump from the start of the combustion operation, and when the accumulatively stored number of driving times of the electromagnetic pump exceeds a predetermined value, the control section ends the preliminary combustion and corrects the correction value in the direction of increasing the amount of fuel oil.

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