JP3649840B2 - Liquid fuel combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid fuel combustion apparatus such as an oil fan heater and a forced air supply / exhaust type hot air heater which vaporizes and burns liquid fuel with a carburetor, and in particular, an improvement in odor suppression control during ignition of the combustion apparatus About.
[0002]
[Prior art]
As control of the ignition operation of the conventional liquid fuel combustion apparatus, a liquid fuel supply amount (fuel amount) corresponding to the air volume (air amount) is supplied as disclosed in JP-A-57-47126. As disclosed in Japanese Patent Application Laid-Open No. Sho 62-56707, the combustion amount (air-fuel ratio) in which the air amount and the fuel amount are balanced and mixed is gradually ignited in a low state such as weak or weak. It was mainstream to make sure that it was ignited. Further, in order to improve the ignitability at the time of ignition, as an example of increasing the amount of fuel (specifically, the amount of combustion of strong combustion or medium combustion), there is one disclosed in JP-A-2-238251, for example. . In any of these, the ignition operation is performed with a combustion amount obtained by mixing the air amount and the fuel amount in a balanced state.
[0003]
[Problems to be solved by the invention]
However, it has been found that unburned gas mixture (hereinafter referred to as unburned gas) is generated even at the time of ignition, and this unburned gas is released outside the body of the liquid fuel combustion device and smells. Yes. In addition, it takes a little time (1 second) from the ignition of the igniter as an ignition device at the time of ignition to the completion of fire transfer to the entire burner part as the flame forming part of the burner after the ignition type is generated. Less). When this fire transfer is completed, the flame rises. At this time, it was found that the flame flickers in an unstable state as a phenomenon indicating the generation of unburned gas. Furthermore, it has been found that, even when there is air from the convection blower during the ignition operation, the ignitability such that the flame is disturbed or the fire is difficult to move is deteriorated and unburned gas is easily generated.
[0004]
The amount of unburned gas here refers to the structure of the combustion part of the liquid fuel combustion device and the control sequence of the ignition operation, to be specific, the structure of the burner head corresponding to the flame forming part, the temperature of the burner head and the vaporizing part, and the mixing It is considered to change depending on various factors such as the gas mixture ratio (air-fuel ratio), the jet speed (speed) of the gas mixture from the flame forming part, and the amount of combustion. Among these various factors, it was found that the mixed gas mixture ratio (air-fuel ratio) and the jet speed of the mixed gas from the flame forming portion have the greatest influence.
[0005]
Therefore, in the present invention, the convection blower is stopped at the initial stage of the ignition operation and the mixing is performed in order to shorten the time until the completion of the flame transfer of the flame forming part at the time of ignition and to reduce the generation of unburned gas as much as possible. The gas mixture ratio (ie, air-fuel ratio) is forcibly fixed and controlled to the side where the air amount is small to increase the mixture ratio of the mixed gas, and at the same time, the jet speed of the mixed gas from the flame forming section can be set appropriately. An object of the present invention is to provide a liquid fuel combustion apparatus.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, the liquid fuel supplied by the fuel supply device is vaporized by the vaporizer, the vaporized gas is mixed with the combustion air from the combustion blower, and the mixed gas is ignited by the ignition device. In the liquid fuel combustion apparatus that burns in the flame forming section, the amount of combustion air is reduced for a predetermined time during the ignition operation to make the fuel mixing ratio higher and the flame are forcibly increased. A control device that suppresses the ejection speed of the mixed gas from the forming portion is provided.
According to the second aspect of the present invention, the liquid fuel supplied by the fuel supply device is vaporized by the vaporizer, and this vaporized gas is mixed with the combustion air from the combustion blower, and this mixed gas is ignited by the ignition device. Then, in the liquid fuel combustion apparatus that burns in the flame forming portion, the amount of the combustion air is decreased for a first predetermined time during the ignition operation, and the mixing ratio of the fuel is forcibly increased as compared with the normal combustion. And a control device that suppresses the jet speed of the mixed gas from the flame forming section and increases the amount of combustion air so that the fuel mixing ratio gradually approaches the mixing ratio during normal combustion after the predetermined time has elapsed. It is provided.
According to a third aspect of the present invention, the control device gradually increases the air amount stepwise or linearly.
[0007]
According to a fourth aspect of the present invention, the control device delays the operation of the convection fan by delaying a predetermined time from the start of the ignition operation.
[0008]
In the invention of claim 5, the fixed time for operating the convection blower is shorter than the predetermined time for reducing the amount of air.
According to a sixth aspect of the present invention, the liquid fuel supplied by the fuel supply device is vaporized by the vaporizer, the vaporized gas is mixed with the combustion air from the combustion blower, and the mixed gas is ignited by the ignition device and flame is set. In the liquid fuel combustion apparatus for burning in the forming portion, the amount of the combustion air is forcibly increased during the first predetermined time during the ignition operation to increase the fuel mixing ratio forcibly and the fuel mixing ratio. A deodorizing control device that suppresses the jet speed of the mixed gas from the flame forming section and increases the amount of combustion air so that the fuel mixing ratio gradually approaches the mixing ratio during normal combustion after the predetermined time has elapsed, and Instruction means are provided.
According to a seventh aspect of the present invention, the liquid fuel supplied by the fuel supply device is vaporized by a vaporizer, the vaporized gas is mixed with combustion air from a combustion blower, and the mixed gas is ignited by an ignition device. In the liquid fuel combustion device that burns in the flame forming part, the ignition operation mode from when the combustion blower is driven to when the fuel supply device is driven until the fuel mixing ratio is stabilized is normal combustion. A first mode higher than the mixing ratio at the time, a second mode in which the mixing ratio gradually approaches the mixing ratio at the time of normal combustion from the mixing ratio in the first mode, and a normal mixing ratio as the normal mixing ratio Mode.
[0009]
According to an eighth aspect of the present invention, a vaporizer that vaporizes liquid fuel, a fuel supply device that supplies liquid fuel to the vaporizer, a combustion blower that supplies combustion air to the vaporizer, and a vaporizer that vaporizes the fuel A flame forming unit that is supplied with a mixed gas of gaseous fuel and combustion air and is ignited by an ignition device to form a flame, and a fuel supply device, a combustion blower, and a control device that controls the operation of the ignition device In the liquid fuel combustion device, the control device drives the fuel supply device as an operation control in the ignition operation period from driving the combustion blower to driving the fuel supply device until the fuel mixing ratio is stabilized. The first predetermined time is set to the first mode in which the fuel mixture ratio is higher than the mixture ratio at the time of normal combustion, and the subsequent second predetermined time is set to be higher than the mixture ratio in the first mode at the time of normal combustion. Lower than the mixing ratio A second mode in which second mixing ratio, followed by those of the normal mode to stabilize the mixing ratio at the time of normal combustion.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
EXAMPLES Next, although an Example demonstrates this invention in more detail, this invention is not limited by these. Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic perspective view showing an overall configuration of a petroleum fan heater as a liquid fuel combustion apparatus according to an embodiment of the present invention. FIG. 2 similarly controls an ignition device, a liquid fuel supply apparatus, a combustion blower, and a convection blower. FIG. 3 is a flowchart showing the outline of the control operation of the control means, FIG. 4 is a main flowchart of the present invention showing the outline of the ignition operation sequence of FIG. 3, and FIG. FIG. 5 is a time chart showing a schematic change of a signal in the ignition operation sequence of FIG. 4.
[0011]
In FIG. 1, reference numeral 1 denotes an outer case constituting the main body of the oil fan heater H, 2 denotes a blower outlet for blowing warm air, and a combustion chamber (not shown) and a combustion blower at the rear of the blower outlet 2 in the outer case 1 In addition, there are convection fans and the like.
[0012]
The combustion chamber here is an electromagnetic for supplying fuel from a fuel tank to a vaporizer and a burner head as a flame forming portion disposed above the vaporizer (collectively referred to as a burner or a combustion portion). Built in a liquid fuel supply device including a pump and a fuel discharge nozzle, an ignition plug (igniter) as an ignition device, an ignition for detecting the state of a flame formed on a burner head, a flame sensor as a flame detection device, and a carburetor A combustion device composed of a vaporizing heater or the like is arranged.
[0013]
3 is an openable / closable lid for inserting and removing a cartridge tank that is detachably set to a fuel tank (not shown), and 4 is an operation of a switch or the like for instructing the operation of the oil fan heater H by a control means described later. An operation panel as an operation unit in which a display unit such as a liquid crystal display unit is disposed, and is provided on the upper surface of the outer case 1.
[0014]
Here, in the lower part of the back of the oil fan heater H, power is supplied to electrical parts such as an operation board arranged immediately below the operation panel 4, a control device S mounted on the control board, a combustion device, a combustion fan, and a convection fan. A power cord is provided to supply power, and when the plug of the power cord is plugged into an outlet, power is supplied to at least the control device S. This is called power-on to distinguish it from on-operation.
[0015]
Next, a schematic configuration of the control device S centering on the control means 11 for controlling the ignition device, the liquid fuel supply device, the combustion blower, and the convection blower will be described.
[0016]
S is a control device centering on the control means 11 which is a main component of the present invention, and the control means 11 is constituted by a microcomputer (hereinafter simply referred to as a microcomputer) having a timer and ROM or RAM as storage means. Yes. The control means, that is, the microcomputer 11 outputs a control signal for controlling the operation of various loads based on the input signal, and 12 is an EEPROM as a storage means which is connected to the microcomputer 11 by a signal line and can be written at any time. is there. In FIG. 2, the EEPROM 12 is expressed as if it were a separate body from the microcomputer 11, but this is not limited to a separate body, and an EEPROM may be incorporated in the microcomputer 11.
[0017]
Various switches 13 to 18 provided on the operation panel 4 and various sensors 19 to 23 provided at appropriate positions are connected to the input side of the control means 11, and electrical components, that is, burners (details) are connected to the output side of the control means 11. Is a vaporizer 24 built in the carburetor, an ignition plug (igniter) 25 as an ignition device, and an electromagnetic pump constituting a part of a liquid fuel supply device for supplying fuel from a fuel tank to a burner (combustion unit) 26, a combustion blower 27 for supplying combustion air to the combustion section, and a convection blower 28 for sucking outside air into the outer case 1 and exchanging heat with the combustion gas generated in the combustion chamber and supplying it to the outlet 2 are connected. Yes.
[0018]
The various switches connected to the input side of the control means 11 include an operation on switch 13 for instructing the start of operation of the oil fan heater H and extension of the combustion time, an operation off switch 14 for instructing to stop the operation, and at the time of operation start. In order to shorten the ignition time, the energization of the vaporizing heater 24 is controlled even during stoppage to preheat the carburetor and wait for the second-speed ignition operation to instruct the second-speed ignition operation, and the combustion set in the combustion air intake port A filter switch 16 that allows the user to recognize the end of cleaning when the air filter is cleaned, an automatic combustion mode in which the combustion amount changes according to room temperature, or a fixed combustion that always burns at a constant combustion amount Temperature control switch 17 including a mode selection unit for selecting a mode, a temperature setting unit for setting an arbitrary room temperature, etc., and the current time and timer operation in the liquid crystal display unit There is a time setting switch 18 to set the start time, and the like time.
[0019]
In the present embodiment, the amount of combustion air is set to be lower than that during normal combustion for the first predetermined time in the ignition operation mode with respect to the operation switch 13, and the fuel mixing ratio is increased. This function is provided as a control instruction means for instructing a control mode (in other words, deodorization control) whose final purpose is deodorization that gradually increases the amount of odors so as to approach the normal amount. As this instruction means, another switch may be provided independently of the operation switch 13, but it is preferable that the switch on the operation panel is also reduced. In addition, when starting the operation, this switch is always used. When the ignition operation is performed in the control mode, the function as the liquid fuel combustion device is enhanced.
[0020]
As various sensors, a burner thermistor 19 provided at the lower part of a burner (specifically a carburetor) for detecting the temperature of the burner, a flame sensor 20 as a flame detecting device for detecting the state of a flame formed in the burner head, a combustion blower An outer case 1 provided in the vicinity of a suction sensor (not shown) and a liquid level sensor 22 for detecting the presence or absence of liquid fuel, such as kerosene, stored in the fuel tank at a predetermined level or higher. There is a room temperature sensor 23 that detects the temperature of the outside air (that is, room air) sucked into the room.
[0021]
Various operation processes of the control means 11 will be briefly described based on FIGS. 3 to 5 with the above configuration.
[0022]
First, when the operation on switch 13 is turned on in step S1 to start operation, the operation lamp is turned on or the character of the operation mode of the liquid crystal display unit is displayed in step S2, and a vaporization heater (for example, a sheathed heater) is displayed in step S3. In step S4, it is determined whether or not the temperature of the carburetor (specifically, the burner body) is a temperature suitable for ignition operation (for example, a temperature range of 250 to 270 ° C.). When the energization control 24 continues and reaches an appropriate temperature, a drive signal is supplied to the combustion blower (specifically, the burner motor) 27 in step S5, and the burner motor 27 starts rotating.
[0023]
The control means 11 determines whether or not the rotation speed of the burner motor detected by the rotation speed sensor 21 has reached a specified rotation speed (here, a first rotation speed R1 = 1100 rpm described later) after a certain period of time. (Step S6) If the prescribed rotational speed R1 has not been reached after a certain period of time, the operation proceeds to Steps S14 to S17. If the prescribed rotational speed R1 has been reached, the ignition operation is performed in Step S7, and the frame in Step S8. It is determined whether or not ignition has been performed based on the flame current detected by the sensor 20, and it is determined in step S9 whether or not normal combustion has occurred.
[0024]
If it is determined that the ignition is not ignited or not normal combustion, the operation proceeds to steps S18 to S25. If the combustion is normal, the ignition operation (spark) of the spark plug is stopped in step S10, and in step S11. The energization of the vaporizing heater 24 is stopped, and an automatic change operation of the combustion amount is started in step S12 so that the combustion mode or the set room temperature is set based on the setting by the temperature control switch 17.
[0025]
In the next step S13, it is determined whether or not the flame state at the combustion amount set based on the flame current detected by the flame sensor 20 is normal. If normal, the operations in steps S12 and S13 are repeated. If it is not normal, the operation proceeds to steps S26 to S31.
[0026]
In step S6, it is found that the rotation speed of the burner motor is abnormal. In step S14, the energization of the vaporizing heater 24 is stopped, and in step S15, the operation lamp is blinked or the operation mode characters on the liquid crystal display are blinked. In step S16, a symbol (for example, E6) indicating an abnormality in the rotational speed of the burner motor is displayed as an abnormality content to notify the abnormality. In this case, the ignition operation is not shifted until the abnormality is cleared. And it can return to step S3 through operation of a user's operation switch 14 and operation switch 13 at Step S17.
[0027]
In step S8 or step S9, it was found that there was an abnormality in which a normal flame could not be detected within the ignition trial period (for example, 23 seconds) (this is called an ignition error), so in step S18 the energization of the vaporizing heater 24 was stopped, In step S19, the operation lamp is blinked or the characters of the operation mode of the liquid crystal display are blinked. In step S20, a symbol indicating ignition failure (for example, E1) is displayed as an abnormality content to notify the abnormality. Subsequently, the ignition operation (spark) of the spark plug 25 is stopped in step S21, the fuel supply operation of the electromagnetic pump 26 is stopped in step S22, the convection blower 28 in step S23, and the combustion blower 27 in step S24. The drive signal is stopped to stop and the ignition sequence is terminated. Then, in step S25, the user can operate the operation switch 14 and the operation switch 13 to return to step S3.
In step S13, it was found that the abnormality was extinguished in the middle of changing the amount of combustion, but this was called an intermediate fire extinguishing. A blinking display is performed, and a symbol indicating fire extinguishing midway (for example, E2) is displayed as an abnormality content in step S27 to notify the abnormality. Subsequently, the fuel supply operation of the electromagnetic pump 26 is stopped in step S28, the drive signal is stopped to stop the convection blower 28 in step S29, and the combustion blower 27 in step S30, and the sequence of combustion amount control is completed. To do. In step S31, the user can operate the operation switch 14 and the operation switch 13 to return to step S3.
[0028]
Now, the ignition operation in step S7 described above will be described in more detail with reference to FIG. First, in step S71, the ignition operation (that is, spark) of the spark plug 25 is started first, and in the subsequent step S72, the electromagnetic pump 26 has a fuel supply amount peculiar to the ignition operation (for example, the amount of medium fuel corresponding to medium combustion). It is determined whether or not a fixed time A (for example, 2.1 seconds) as a delay time has elapsed since the time when the electromagnetic pump 26 is driven in step S73, and time is determined in step S74. A drive signal for driving the convection blower 28 at a normal rotation speed F (for example, rotation speed 960 rpm commensurate with medium combustion) is output until A has elapsed.
[0029]
For this reason, the convection blower 28 stops at the beginning of the ignition trial period in which the operation is continued in the order of the start of supply of combustion air in a smaller amount than usual, the start of ignition spark, and the start of supply of fuel and the ignition is attempted. Therefore, the mixed gas of fuel and combustion air supplied to the burner head has a lower jetting speed than the conventional gas, and it is used for convection only for a certain time A with respect to the mixed gas of this slower speed. It is possible to eliminate the influence of wind, which prevents the turbulent wind from disturbing the unstable flow of the mixed gas to be ignited and making it unstable. ) Makes it easier to ignite. In particular, the conventional ignition delay and sparking (flame lifting) phenomenon are less likely to occur, and the generation of unburned gas due to these ignition delays or ignition mistakes and flame lifting can be suppressed.
[0030]
Further, since the predetermined time B for reducing the amount of air is also shortened for a certain time A during which the convection blower 28 is turned, the convection blower 28 is turned during the first mode in the ignition trial period to be described later, and the combustion blower The time required for cooling the burner (this is called pre-purge) is shortened by the wind alone, and the time during which the pre-purge effect cannot be expected is shortened. As a result, the generation of unburned gas is also suppressed, resulting in improved ignition performance. did it.
[0031]
The time starting from when the electromagnetic pump 26 is driven in the next step S74 is a fixed time B as a predetermined time for reducing the amount of combustion air from the normal time (conditions B ≧ A, the period of B is ignited trial) It is determined whether or not a first mode in the period, for example, 3 seconds, has elapsed, and the rotation speed of the combustion blower 27 is determined from the first rotation speed R1 until time B elapses in step S76. Is increased to a second rotation speed R2 (this is referred to as a second mode, for example, 1350 rpm) that is smaller than the rotation speed R3 (this is referred to as a normal rotation speed) corresponding to the supply amount of the electromagnetic pump 26 for a certain time. Continue driving for C (for example, 25 seconds).
[0032]
For this reason, an ignition operation (the above-described ignition trial period is performed) by forcibly fixing the fuel mixing ratio to a higher side than the normal time for a predetermined time B so that air is less than the fuel supplied to the burner. ) In the initial stage (ie, the first mode), the air flow rate is suppressed, so that the jet speed of the mixed gas can be made slower than that of the conventional gas. As a result, the flame in the flame forming portion is not lifted. As a result, the flame can be generated quickly by spreading over the entire flame forming section, and the fire transfer in the flame forming section can be performed in a shorter time and more reliably than the conventional ignition control operation. The generation of unburned gas during this period was reduced.
[0033]
Further, the rotational speed of the combustion blower 27 is larger than the first rotational speed R1 and matches the supply amount of the electromagnetic pump 26 so that the mixing ratio approaches the mixing ratio during normal combustion after the predetermined time B has elapsed. By setting the second rotation speed R2 smaller than R3 (that is, the second mode in the ignition trial period) and increasing the amount of air, a flame formed in the flame forming portion at the time of ignition is generated due to an excessively small air. It was possible to make the sound when making it smaller than before.
[0034]
In addition, since the amount of combustion air is gradually increased stepwise (or linearly), the amount of combustion air is gradually increased until the flame condition during the ignition trial period is stabilized. Therefore, it is possible to suppress a rapid temperature change of the flame forming portion and the flame itself due to a rapid change in the air volume, and as a result, it is possible to gradually increase the temperature of the flame forming portion. In addition, the amount of time during which the amount of combustion is continued while the state of the flame tends to become unstable is reduced, the generation of a lift-like flame at the beginning of the ignition trial period can be suppressed, and the flame does not burn when there is a lift-like flame. The amount of mixed gas, i.e., unburned gas, ejected from the flame hole of the burner head can be suppressed, and the odor during the ignition operation can be further reduced, resulting in a shorter time to confirm ignition. became.
[0035]
Thereafter, it is determined in step S77 whether or not a predetermined time C has elapsed. In step S78, the rotational speed of the combustion blower 27 is changed to the normal rotational speed R3 (this is the normal mode as the third mode in the ignition trial period). (E.g., 1500 rpm), and the process proceeds to step S8.
[0036]
As described above, the ignition trial period from the time when the combustion blower is driven to the time when the fuel supply device is driven and the fuel mixing ratio is stabilized is divided into three modes of the first mode, the second mode, and the normal mode. With this configuration, the gas mixture jet speed at the beginning of the trial period (that is, the first mode) becomes slower than the conventional one, and the fire transfer in the flame forming portion can be performed in a shorter time and more reliably than the conventional ignition operation. Thus, the amount of unburned gas generated in the first mode is reduced, so-called ignition odor is reduced, and there is a marked effect compared to conventional ignition control.
[0037]
【The invention's effect】
According to the liquid fuel combustion apparatus of the first aspect, the fuel mixing ratio is forcibly fixed to a higher side than the normal time for a predetermined time so that the amount of air is reduced with respect to the fuel. In order to suppress the air volume in the initial stage, the jet speed of the mixed gas can be slowed, and as a result, the flame in the flame forming part can be generated not to be lifted but to spread over the entire flame forming part, Fire transfer at the flame forming portion can be performed in a shorter time and more reliably than the conventional ignition operation, and the generation of unburned gas during this period is reduced.
[0038]
According to the liquid fuel combustion apparatus of claim 2, the flame forming section is configured to forcibly fix the fuel mixing ratio to a higher side than during normal combustion for a predetermined time so that air is less than the fuel. In the same manner as in claim 1, the heat transfer is completed as compared with the prior art by slowing down the gas mixture jet speed and increasing the amount of air so that the mixing ratio becomes close to the mixing ratio at the time of normal combustion after the elapse of the predetermined time. In addition to shortening the time until the flame is generated at the time of ignition, it is possible to reduce the sound when the flame is generated, and also to shorten the time until the flame stabilizes, until the ignition is confirmed as a result. The time is shortened.
[0039]
According to the combustion apparatus of the third aspect, since the amount of combustion air is gradually increased stepwise or linearly, in addition to the effect of the second aspect, ignition until the flame state is stabilized Since the amount of combustion air in the initial stage of operation can be gradually increased and shifted, it is possible to suppress a rapid temperature change of the flame forming portion and the flame due to a sudden change in the air flow, resulting in a temperature of the flame forming portion. It is possible to gradually raise the flame, reduce the time that the flame state remains unstable, suppress the generation of a lifty flame at the beginning of ignition operation, and do not burn when there is a lifty flame The amount of the mixed gas, that is, the unburned gas ejected at the same time can also be suppressed, and the odor during the ignition operation can be further reduced.
[0040]
According to the combustion apparatus of the fourth aspect, in addition to the effect of the second aspect, by operating the convection blower with a delay from the start of the ignition operation, in addition to the effect of the wind on the mixed gas in the flame forming portion when igniting In addition to eliminating the influence, the appropriate flow of the mixed gas from the combustion blower is not disturbed by the wind of the diverting blower, and the ignition delay or flying (flame lifting) phenomenon does not occur or is difficult to occur. Thus, generation of unburned gas due to this ignition delay and lifting could be suppressed.
[0041]
According to the combustion device of the fifth aspect, since the fixed time for delaying the operation of the convection blower is shorter than the predetermined time for reducing the amount of air, in addition to the effects of the second to fourth aspects, The convection blower is operated for a predetermined time, that is, during the ignition trial period, and the adverse effect of the wind of the convection blower at the beginning of the ignition operation is eliminated, while the time when the amount of air of the mixed gas is small is shortened. Since the time when the pre-purge effect cannot be expected is shortened, the generation of unburned gas is suppressed, and the ignition performance is further improved.
[0042]
According to the liquid fuel combustion apparatus of the sixth aspect, by providing the instruction means for instructing the control operation of the deodorizing ignition, it is possible to arbitrarily control the deodorizing ignition, and the liquid fuel combustion apparatus As a result, ignitability and usability improved. If the operation start instruction means is also used as the instruction means, an ignition operation that can always expect a deodorizing effect is performed at the start of operation.
[0043]
According to the liquid fuel combustion apparatus according to claim 7 and 8, the ignition operation mode from the time when the combustion blower is driven to the time when the fuel supply apparatus is driven and the fuel mixing ratio is stabilized, the first mode, By comprising the second mode and the normal mode, the jet speed of the mixed gas at the initial stage of the ignition operation becomes slower than the conventional one, and the fire transfer in the flame forming part is shorter than the conventional ignition operation. In addition, the amount of unburned gas generated in the first mode, especially in the first mode, decreased during this period, and the odor during ignition decreased.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an overall configuration of a petroleum fan heater as a liquid fuel combustion apparatus according to an embodiment of the present invention.
FIG. 2 is a block circuit diagram of a control device mainly including control means for controlling the ignition device, the liquid fuel supply device, the combustion blower, and the convection blower.
FIG. 3 is a flowchart showing an outline of the control operation of the control means.
4 is a main flowchart of the present invention showing an outline of an ignition operation sequence of FIG. 3; FIG.
FIG. 5 is a time chart showing a schematic change of signals in the ignition operation sequence of FIG. 4;
[Explanation of symbols]
H Petroleum fan heater (liquid fuel combustion device)
S Controller 11 Microcomputer (control means)
20 Flame sensor (flame detection device)
24 Vaporizing heater (vaporizer)
25 Spark plug (ignition device)
26 Electromagnetic pump (fuel supply device)
27 Combustion Blower 28 Convection Blower

Claims (8)

The liquid fuel supplied by the fuel supply device is vaporized by the vaporizer, and this vaporized gas is mixed with the combustion air from the combustion blower, and this mixed gas is ignited by the ignition device and burned in the flame forming section In the fuel combustion apparatus, only for a predetermined time during the ignition operation, the amount of the combustion air is made smaller than that in the normal time to forcibly increase the fuel mixing ratio, and the ejection speed of the mixed gas from the flame forming portion is increased. A liquid fuel combustion apparatus comprising a control device for suppressing. The liquid fuel supplied by the fuel supply device is vaporized by the vaporizer, and this vaporized gas is mixed with the combustion air from the combustion blower, and this mixed gas is ignited by the ignition device and burned in the flame forming section In the fuel combustion apparatus, only for the first predetermined time during the ignition operation, the amount of the combustion air is made smaller than that during normal combustion to forcibly increase the fuel mixing ratio, and the mixed gas from the flame forming unit And a control device for increasing the amount of combustion air so that the fuel mixing ratio gradually approaches the mixing ratio during normal combustion after the predetermined time has elapsed. apparatus. 3. The liquid fuel combustion apparatus according to claim 2, wherein the control device gradually increases the air amount stepwise or linearly. 4. The liquid fuel combustion apparatus according to claim 2, wherein the control device operates the convection blower with a certain delay from the start of the ignition operation. 5. The liquid fuel combustion apparatus according to claim 4, wherein a predetermined time for delaying the operation of the convection blower is shorter than a predetermined time for reducing the amount of air. The liquid fuel supplied by the fuel supply device is vaporized by the vaporizer, and this vaporized gas is mixed with the combustion air from the combustion blower, and this mixed gas is ignited by the ignition device and burned in the flame forming section In the fuel combustion apparatus, only during the first predetermined time during the ignition operation, the amount of the combustion air is made smaller than that during normal combustion to forcibly increase the fuel mixing ratio, and after the predetermined time has elapsed, the fuel mixing is performed. A liquid fuel combustion apparatus comprising a deodorizing control device for increasing the amount of combustion air so that the ratio gradually approaches the mixing ratio at the time of normal combustion and its instruction means. The liquid fuel supplied by the fuel supply device is vaporized by the vaporizer, and this vaporized gas is mixed with the combustion air from the combustion blower, and this mixed gas is ignited by the ignition device and burned in the flame forming section In the fuel combustion device, the ignition operation mode from when the combustion blower is driven to when the fuel supply device is driven until the fuel mixing ratio is stabilized is the first fuel mixing ratio higher than that during normal combustion. It is characterized by comprising a mode, a second mode in which the mixing ratio gradually approaches the mixing ratio in the normal combustion from the mixing ratio in the first mode, and a normal mode in which the mixing ratio is the normal mixing ratio. Liquid fuel combustion device. A vaporizer that vaporizes liquid fuel, a fuel supply device that supplies liquid fuel to the vaporizer, a combustion blower that supplies combustion air to the vaporizer, and gaseous fuel and combustion air vaporized by the vaporizer In a liquid fuel combustion apparatus comprising a flame forming section that is supplied with a mixed gas and is ignited by an ignition apparatus to form a flame, and a fuel supply apparatus, a combustion blower, and a control apparatus that controls the operation of the ignition apparatus. The first predetermined time after the fuel supply device is driven is determined as the operation control in the ignition operation period from the time when the combustion blower is driven to the time when the fuel supply device is driven and the fuel mixture ratio is stabilized. Is the first mode in which the mixing ratio is higher than the mixing ratio at the time of normal combustion, and the second mixing after that for the second predetermined time is higher than the mixing ratio in the first mode and lower than the mixing ratio at the time of normal combustion. Second as a ratio Mode and then, followed by liquid fuel combustion apparatus, characterized in that the normal mode to stabilize the mixing ratio at the time of normal combustion.

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