JP2000205561A - Combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an aging lowering trend due to an adhesion of tar when weak combustion is executed by improving a temperature detecting accuracy of a vaporizer when a combustion amount is regulated. SOLUTION: The combustion equipment comprises a combustion amount setting means 52, a fuel supply means 24, a vaporizer 32, a heater 42, a burner 44, a temperature detector 49 arranged in the vaporizer 32, a vaporizer temperature detector 53 for detecting a vaporizer temperature, a determining unit 58 for determining a temperature drop of the vaporizer 32, a reset confirming unit 64 for confirming a reset state of the vaporizer temperature, and a combustion amount correcting unit 59 for increasing a combustion amount by a predetermined amount according to an output signal of the unit 58. A combustion amount correcting operation corrects the combustion amount preset times through the unit 58 in a direction for increasing the amount, in the state that at least the combustion amount set value is lowered to a predetermined range including a 'weak' combustion by the means 52 when the vaporizer temperature is lowered from the predetermined temperature set by the unit 58 through the unit 59.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for vaporizing and burning liquid fuel.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, this type of combustion apparatus energizes and heats a heater 2 embedded in a vaporization section 1,
The temperature of the vaporizing section is detected by a temperature detecting means 4 by a temperature detector 3 provided at an appropriate position of the vaporizing section 1, and the temperature of the vaporizing section is controlled to a predetermined temperature via a heater control section 5.
Then, based on a predetermined sequence by the controller 6, the liquid fuel is supplied to the vaporizing section 1 kept at a high temperature by the pump 7 to be vaporized, and mixed with the combustion air supplied by the blower 9 to the burner section 8. It is supplied and burned.

[0003] The pump 7 and the blower 9 are set on the basis of the combustion amount set value determined by the combustion amount setting section based on the room temperature and the set temperature.
The amount of combustion is controlled by increasing or decreasing the capacity of the fuel cell.

[0004]

However, when the combustion amount is controlled at a fixed amount determined by the room temperature and the set temperature in the entire combustion amount control range as in the prior art, the combustion region is set to be small on the weak combustion side. After that, the degree of recovery of the combustion heat from the burner section to the vaporization section deteriorates, and the phenomenon that the vaporization section temperature drops extremely occurs, and the supplied liquid fuel does not completely vaporize. Such a phenomenon may occur that the part becomes a tar state and adheres to the vaporizing part and the nozzle, or the heater for heating is turned on beyond the self-combustion limit range. If tar adheres to the nozzle, the pressure loss of the nozzle increases and the amount of gaseous gas ejected, that is, the amount of combustion, further decreases, and the combustion balance is disturbed. It has various problems of deterioration and odor. In particular, in a combustion device in which the amount of combustion on the weak combustion side is set extremely small in order to improve usability as in recent years and the variable range of the amount of combustion is enlarged, the influence is remarkably affected. Therefore, the baking operation for the purpose of tar removal must be frequently performed before the above-mentioned problems occur, which is extremely poor in usability.

Further, when the heater is turned on at the time of weak combustion, power consumption during operation is increased and economic efficiency is deteriorated.

[0006] Further, if the combustion amount further drops below the specified value during weak combustion, the tendency of the flame rod current to decrease is reduced even in an oxygen-deficient state. This causes a problem in terms of sex.

[0007] Further, even with the secular flow reduction phenomenon of the electromagnetic pump, which is the fuel supply means, and the flow fluctuation at the time of weak combustion, the tendency for the combustion amount to decrease on the weak combustion side is promoted, and the temperature of the vaporization section is further reduced. This causes a similar problem.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to detect a tendency of a decrease in the amount of combustion due to various factors based on a change in the temperature of a vaporizing section to maintain good combustion.

[0009]

In order to achieve the above object, a combustion amount setting means for setting a combustion amount based on a room temperature and a set temperature, a fuel supply means for supplying fuel, and a vaporizing section for vaporizing the supplied fuel. A heater for heating the vaporizing section, a burner section for burning gas vaporized in the vaporizing section, a temperature detector disposed in the vaporizing section, and detecting a temperature of the vaporizing section by a signal from the temperature detector. A vaporization unit temperature detection unit, a determination unit that determines a decrease in the temperature of the vaporization unit, a return confirmation unit that confirms a return state of the vaporization unit temperature, and combustion that increases the amount of combustion by a predetermined amount based on an output signal of the determination unit. The combustion amount correction operation is performed in a state where at least the combustion amount set value has been reduced to a predetermined range including “weak” combustion by the combustion amount setting means, and the vaporization unit temperature is set by the determination unit. Predetermined temperature When lowered, and corrects the direction of increasing only the combustion quantity preset number of times over the combustion amount correcting unit.

According to the above invention, when the amount of combustion falls to a predetermined range including "weak" combustion, the determination section compares the vaporization section temperature with the determination temperature set to a temperature lower than the vaporization section temperature during normal combustion. When the temperature falls below the determination temperature, a signal is output to the combustion amount correction unit, and correction is performed so that the combustion amount is larger by a predetermined amount than the combustion amount at that time, and the vaporization unit temperature change after the correction operation is performed. If the vaporization section temperature does not show a recovery tendency, the correction operation is repeated a predetermined number of times to increase the amount of combustion so as to prevent the reduction of the vaporization section temperature. Even if there is a long-term decrease in the flow rate of the pump or a variation in the flow rate during weak combustion, the amount of combustion on the weak combustion side can be reliably maintained at or above the set value, and the temperature of the vaporization section is vaporized by liquid fuel. More than the temperature required for Is shall. Therefore, the combustion state is not deteriorated by poor vaporization due to a decrease in the temperature of the vaporization section, and a favorable combustion state can be maintained.
Even in an oxygen-deficient state, the tendency of the flame rod current to decrease can be ensured, and appropriate detection can be performed.

[0011]

According to the combustion apparatus of the first aspect of the present invention, a combustion amount setting means for setting a combustion amount based on a room temperature and a set temperature, a fuel supply means for supplying fuel, and a fuel supply means. A vaporizing section for vaporizing, a heater for heating the vaporizing section, a burner section for burning the gas vaporized in the vaporizing section, a temperature detector disposed in the vaporizing section, and a vaporizing section based on a signal from the temperature detector. A vaporization unit temperature detection unit that detects a temperature, a determination unit that determines a decrease in temperature of the vaporization unit, a return confirmation unit that confirms a return state of the vaporization unit temperature, and a predetermined amount of combustion based on an output signal of the determination unit. A combustion amount correction unit that increases the combustion amount by at least the combustion amount setting means in a state where the combustion amount setting value has been reduced to at least a predetermined range including “weak” combustion, and the vaporization unit temperature is determined by the determination. Predetermined temperature set in section When more it drops, and corrects the direction of increasing only the combustion quantity preset number of times over the combustion amount correcting unit.

When the amount of combustion decreases to a predetermined range including "weak" combustion, the determination unit compares the vaporization unit temperature with a determination temperature set to a temperature lower than the vaporization unit temperature during normal combustion. When the temperature decreases below, a signal is output to the combustion amount correction unit, the correction is performed so that the combustion amount is larger by a predetermined amount than the combustion amount at that time, and the vaporization unit temperature change after the correction operation is continuously performed. After confirming, if the vaporization section temperature does not show a recovery tendency, the correction operation is repeated a predetermined number of times to prevent a decrease in the vaporization section temperature by increasing the amount of combustion. Even if there is a flow rate decrease phenomenon or a flow rate variation during weak combustion, the amount of combustion on the weak combustion side can be reliably maintained at or above the set value, and the temperature of the vaporization section is the temperature required to vaporize the liquid fuel. Can secure the above That. Therefore, the combustion state is not deteriorated due to poor vaporization due to a decrease in the temperature of the vaporization section, and a good combustion state can be maintained.Also, even in an oxygen-deficient state, the tendency of the flame rod current to decrease can be ensured. Appropriate detection becomes possible.

Further, according to the combustion apparatus of the second aspect, the determination unit has the combustion amount correction level set higher than the normal heater ON control temperature and the first timer means, and the vaporization unit temperature is set to the combustion amount correction level. When the temperature drops further, a signal is output to the combustion amount correction unit, and the first timer means is operated to continue the combustion amount correction operation if the vaporization unit temperature after a predetermined time has not reached the combustion amount correction level. When the amount exceeds the amount correction level, the correction amount at that time is set as the lower limit value of the combustion amount set value, and the combustion amount control operation is performed.

In the combustion amount correction operation performed when the temperature of the vaporizing section decreases to the combustion amount correction level, which is the determination temperature, due to the tendency for the combustion amount to decrease during weak combustion, the first timer means operating after the correction operation performs combustion for a predetermined time. Since the stabilization of the state is ensured, it is possible to reliably detect the effect of the combustion amount correction operation without erroneous detection due to an unstable change in the vaporization section temperature after the combustion amount correction operation. it can. In addition, when the vaporization section temperature is recovered to the combustion amount correction level by the correction operation, the combustion amount control is continued with the corrected combustion amount as the lower limit, so that the combustion amount at the time of weak combustion is equal to or more than a specified value. , And a required vaporization section temperature can be secured.

According to the third aspect of the present invention, the return confirmation unit has the combustion amount correction release level set higher than the combustion amount correction level set by the correction unit and the second timer means. The second timer means is actuated when the later vaporization section temperature is equal to or higher than the combustion amount correction cancellation level, and when the vaporization section temperature after a predetermined time is equal to or higher than the combustion amount correction cancellation level, via the combustion amount correction section. The combustion amount correction operation is canceled and the lower limit of the combustion amount set value is set to a predetermined value.

When the temperature of the vaporizing section recovers to the normal combustion temperature and exceeds the combustion amount correction canceling level, the change state of the vaporizing section temperature is confirmed for a predetermined time by the second timer means. It is possible to determine whether the recovery factor of the part temperature is due to the improvement of the heat recovery rate by the combustion amount correction operation or the heating by the heater, and the combustion amount correction operation is released only when the vaporization part temperature is recovered by the rise of the heat recovery temperature. Thus, an appropriate correction operation is ensured.

According to the fourth aspect of the present invention, the combustion amount release level is changed according to the combustion amount.

Then, the difference in the heat recovery temperature due to the amount of combustion is corrected, and the recovery state of the vaporization section temperature is accurately detected to secure an appropriate correction operation.

According to the combustion apparatus of the fifth aspect, the second aspect
The timer means is set to be longer than the time required until the temperature of the vaporizing section after the heater is turned on becomes lower than the combustion release level.

In the detection of the cancellation of the combustion amount correction operation, an erroneous detection due to heater heating is prevented by setting a detection delay time longer than a change time of the vaporization section temperature due to heater heating.

According to the combustion apparatus of claim 6, when the combustion operation is resumed after performing one or more combustion amount correction operations,
The lower limit of the combustion amount set value is set to a predetermined value.

If the combustion amount correction operation is performed even once after the start of the operation due to the decrease in the temperature of the vaporizing section, the combustion amount at the time of the weak combustion, which is the lower limit of the combustion amount set value at the start of the subsequent operation, is initialized. By setting a value larger than the set value, a tendency of a decrease in the combustion amount is prevented, and an appropriate vaporization section temperature is ensured.

[0023]

(Embodiment 1) Embodiment 1 of the present invention will be described below with reference to the drawings.

First, the configuration of a hot-air heating device using the combustion apparatus of the present invention will be described with reference to FIG. Reference numeral 21 denotes a main body case, a tank 22 holding liquid fuel on a lower side thereof, and a detachable cartridge tank 23 above the tank 22.
Is arranged. Numeral 24 denotes a pump mounted on the upper surface of the tank 22, which is adapted to lead an oil feed pipe 25 from its upper end to supply fuel to a combustion unit 26.

Reference numeral 27 denotes a combustion tube for guiding the combustion exhaust gas from the combustion section 26 upward, and a blower 28 for taking in and sending out the indoor air flow is disposed behind the combustion tube. Reference numeral 29 denotes a duct which mixes the combustion exhaust gas from the combustion tube 27 with the indoor air flow to generate hot air. A control device 30 controls the combustion of the combustion section 26 and the blower 28, and controls the pump 24, the blower 28, and the like in a predetermined sequence based on an operation condition signal input from the operation section. .

The combustion part 26 is provided with a frame rod 31 so as to be in contact with the flame so as to monitor the combustion state.

Next, the detailed configuration of the combustion section 26 and the combustion control operation will be described with reference to the block diagram of FIG. 32
Is a vaporizing section, a circular burner receiving seat 33 is provided on the upper portion thereof, and a nozzle 34 is arranged so as to be located substantially at the center of the burner receiving seat 33.
An opening 35 for taking in primary air for supplying combustion air is provided between the nozzles 4, and a cylindrical vaporizing chamber 37 is formed integrally with the cylindrical vaporizing chamber 37 extending in the outer peripheral direction through a communication port 36 communicating with the nozzle. The vaporizing chamber 37 is formed by fixing a vaporizing cap 38 connected to the oil feed pipe 25 to the vaporizing section 32 by brazing or the like. The vaporizing chamber 37 is provided with a cylindrical brush-shaped vaporizing element 41 formed by interposing a number of flocking lines 40 between a plurality of axes 39 and twisting the axes 39.
Further, a heater 42 is provided along the lower surface side of the burner receiving seat 33 on the opposite side of the vaporizing chamber 37 of the vaporizing section 32.

Numeral 43 denotes a bottomless cylindrical mixing tube mounted on the burner receiving seat 33 so as to be located above the nozzle 34. The mixing tube 43 is opposed to the nozzle 34. The primary air sucked by the ejector effect by the ejection of the fuel gas is mixed with the primary air.

Reference numeral 44 denotes a canned cylindrical burner portion which is overlapped and covered on the burner receiving seat 33 from the upper opening side so as to cover the mixing tube 43, and has a plurality of flame holes 44A formed in the lower peripheral wall.

Reference numeral 45 denotes an upwardly tapered burner ring attached to the burner receiving seat 33 so as to surround the outer peripheral portion of the flame hole 44A. Reference numeral 46 denotes a heat receiving portion formed in the burner receiving seat 33.

Reference numeral 47 denotes a flame hole 44 provided in the burner portion 44.
The frame rod 47 and the burner 4
By applying a predetermined voltage between the four, a flame current flows through the flame.

Numeral 48 is a combustion confirming means for detecting a flame current flowing through the frame rod 47 and comparing the detected flame current with a predetermined value to generate an output. Reference numeral 49 denotes a temperature detector provided in the vaporizing section 32 near the nozzle 34, and detects the temperature of the vaporizing section 32. 50 is a room temperature detecting means, 51 is a temperature setting means, and 52 is a combustion amount setting means for setting a combustion amount based on signals from the room temperature detecting means 50 and the temperature setting means 51. 5
Reference numeral 3 denotes a vaporizer temperature detector which calculates a vaporizer temperature from a signal from the temperature detector 49 and outputs the temperature as a temperature signal. Reference numeral 54 denotes a combustion which sets a predetermined determination value to determine a temperature reduction state of the vaporizer 32. The amount correction level setting means 55 is a signal output when the combustion amount is reduced to a predetermined range by the combustion amount setting means 52 in the first comparing section. The output of the vaporization section temperature detection section 53 and the combustion amount correction level By comparing the determination values set by the setting means 54, the temperature reduction state of the vaporization unit 32 in the weak combustion range is confirmed. Reference numeral 56 denotes a first timer means which starts the operation when the temperature of the vaporizing section 32 is confirmed to be low by the first comparing section 55, and checks the output state of the vaporizing section temperature detecting section 53 for a predetermined time. Numeral 57 denotes a judging means that the first comparing unit 5 operates even after the time set by the first timer means 56 has elapsed.
If it is confirmed in step 5 that the temperature of the vaporizing section 32 has dropped, a predetermined signal is output. The determination unit 58 is formed by these 55 to 57. Reference numeral 59 denotes a combustion amount correction unit that outputs a correction signal so as to increase the weak side combustion amount by a predetermined amount based on the signal of the determination unit 57. Numeral 60 denotes a vaporizer 32 associated with the combustion amount correction operation.
A combustion amount correction cancellation level setting means 61 for setting a predetermined confirmation value for confirming the temperature recovery state of the fuel cell, a reference value 61 set by the combustion amount correction cancellation level setting means 60 in the second comparing section and the vaporization section temperature detection The output of the vaporizing section 32 is compared with the output of the vaporizing section 32.
Check the temperature recovery status. The operation of the second timer means 62 is started when the temperature of the vaporizing section 32 is recovered by the second comparing section 61 and the output state of the vaporizing section temperature detecting section 53 is confirmed for a predetermined time. I have. Numeral 63 denotes a return confirming means, when the temperature recovery of the vaporizing part 32 is confirmed by the second comparing part 61 even after the time set by the second timer means 62 has elapsed, the correcting operation of the combustion amount correcting part 59. To cancel. The return confirmation portion 64 is formed by these 60 to 63. Reference numeral 65 denotes a heater control unit that controls the temperature of the vaporizing unit 32 to a predetermined constant temperature based on a signal from the vaporizing unit temperature detecting unit 53. 66 controls the combustion operation by driving the pump 24, the blower 28, the heater 42, and the like based on a predetermined sequence, and performs the combustion operation based on signals from the combustion confirmation unit 48, the heater control unit 64, and the combustion amount correction unit 59. A controller that detects and controls changes.

In the above configuration, the combustion control operation will be described with reference to the flowchart of FIG. 3 and the diagram showing the relationship between the temperature of the vaporizer and the amount of combustion in FIG. First, when operation is started based on a predetermined sequence, combustion is performed at a combustion amount set according to a difference between room temperature and a set temperature. And the vaporization unit 32
The temperature of is maintained above the temperature required to vaporize the liquid fuel by recovering this combustion heat, and self-combustion is performed over the entire combustion control range to ensure an appropriate combustion state. If deteriorated kerosene or defective kerosene mixed with different types of oil is used, the vaporization capacity will decrease over time, and a tendency to decrease the amount of combustion will be observed. This phenomenon is significantly affected by the tendency of reducing the amount of combustion on the weak side in order to increase the amount of combustion as in recent years. That is, in a burner configured to maintain the temperature of the vaporizing section 32 at an appropriate temperature by recovering heat of combustion, if the amount of combustion becomes smaller than the heat recovery balance point determined by the heat capacity of the vaporizing section 32 and the heat receiving configuration, The heat recovery suddenly deteriorates, and the temperature of the vaporizing section 32 decreases. Therefore, even during the combustion, the heater 42 is turned on or a tar adhesion phenomenon occurs, which promotes poor vaporization and deteriorates the combustion state. Therefore, in the embodiment of the present invention, in a predetermined range where the combustion amount is on the weak combustion side, for example, in a range of the combustion amount Q5 or less shown in FIG. The detected temperature of the vaporization unit 32 is determined by the determination unit 5.
Then, whether or not the temperature has decreased to the determination temperature A, which is the correction level set by the combustion amount correction level setting means 54 of FIG. 8, is compared for a predetermined time (t0). , The combustion amount correction unit 59 is operated to change the current combustion amount Q1 to a combustion amount Q2 that is increased by a predetermined amount. At the same time, the first timer means 56 is operated by the output of the first comparing section 55, and the combustion amount Q after the correction for a predetermined time (t1).
2 is maintained. Then, after a lapse of a predetermined time (t1), the temperature of the vaporizing section 32 rises above the determination temperature A (B
Point), when the signal is not output from the first comparing unit 55, the lower limit value of the combustion amount is set as the corrected combustion amount Q2, and thereafter,
Continue combustion control. That is, when the temperature of the vaporizing section 32 exceeds the determination temperature A after the combustion amount correction operation, the correction amount at that time is set as the weak combustion amount set value, and the combustion amount during weak combustion is increased. Further, when the temperature drops again from the determination temperature A, the combustion amount is further corrected through the combustion amount correction unit 59 in the same manner, and the state becomes the combustion amount Q3. Then, even in this state, after a predetermined time (t1) has elapsed, the temperature of the vaporizing section 32 has not risen above the determination temperature A (points C and D).
Indicates that the combustion amount correction operation is further continued and the combustion amount is
5 state. Then, this series of combustion amount correction operations is performed a predetermined number of times, for example, four times according to FIG. 4, and if the temperature of the vaporization unit 32 still does not rise above the determination temperature A, the final correction amount, for example, Q5 is set as a weak combustion amount setting value, and thereafter, the combustion amount is controlled between the combustion amount Q5 and the strong combustion amount according to the room temperature and the set temperature.

Next, in the above-described series of combustion amount correction operations, when the temperature of the vaporizing section 32 has recovered to the release temperature F which is the release level set above the judgment temperature A, the second operation is performed.
The state is detected by the comparing section 61 and the second timer means 62
And after a predetermined time (t2) elapses, the return confirmation means 6
3, the output state of the second comparing section 61 is detected, and if the release temperature F or higher is maintained, the combustion amount correction operation is released,
A predetermined value larger than the initial value Q1, for example, Q3, is set as the weak combustion amount setting value. Thereafter, the combustion amount is controlled between the combustion amount Q3 and the strong combustion amount according to the room temperature and the set temperature, and the weak side is set. This is to suppress the tendency of the combustion amount to decrease, thereby preventing the temperature of the vaporizing section 32 from decreasing. Further, the release temperature F is corrected according to the set value of the combustion amount setting means 52,
Correction of the heat recovery temperature based on the difference in the amount of combustion is performed so that the correct release temperature F is set. Further, after the combustion amount correction operation, the second timer means 62
For example, when the operation switch is turned ON / OFF,
When the vaporizer temperature drops to the heater ON temperature and the heater 42 is in a heated state, the heater is turned off after the heater is turned on to distinguish from a case where the vaporizer temperature rises due to the heating of the heater and exceeds the release temperature F. Thus, the timer operation time (t2) is set so as to be longer than the time required to decrease to the release temperature F. Thereby, even if the heater 42 is turned on after the combustion amount correction operation and the temperature of the vaporization section rises, the temperature rise of the vaporization section can be detected ignoring the temperature rise due to the heating of the heater. It can be performed.

Next, a description will be given of an oxygen deficiency operation. In general, the balance between fuel and combustion air is set at the rated combustion amount. If the combustion amount is large and the oxygen-deficient state occurs, the balance between the fuel and combustion air is greatly disturbed, resulting in a remarkable yellow flame combustion. Invite. Therefore, the flame form also greatly changes, and the flame rod current tends to extremely decrease.
By detecting this frame rod current, the state of oxygen deficiency can be accurately confirmed. However, when the combustion amount is small and the combustion is weak, even if the oxygen deficiency occurs, the imbalance between the fuel and the combustion air does not significantly affect the combustion state, and there is no extreme tendency to decrease the flame rod current. , Resulting in a delayed state of oxygen deficiency. Therefore, in the embodiment of the present invention, the phenomenon in which the temperature of the vaporizing section 32 decreases when the combustion amount decreases is detected, and a series of combustion amount correction operations are performed as described above, so that the combustion amount on the weak combustion side is determined. Value so that the flame form greatly changes when the oxygen deficiency occurs, so that the flame rod current shows a predetermined tendency to decrease, so that the oxygen deficiency can be accurately detected even during weak combustion. ing.

If the combustion amount correction operation has been performed even once in the past at the time of re-operation other than the operation stop by the power outlet, the lower limit of the combustion amount set value at the time of the re-operation is set to a predetermined value. A value, for example, the combustion amount Q3 is set to suppress the tendency of the combustion amount to decrease.

[0037]

As described above, according to the combustion apparatus of the first aspect, even if there is a long-term decrease in the flow rate of the electromagnetic pump or a variation in the flow rate during weak combustion, the combustion amount on the weak combustion side can be ensured. In this case, the temperature of the vaporizing section can be maintained at a temperature higher than that required for vaporizing the liquid fuel. Therefore, the combustion state is not deteriorated due to poor vaporization due to a decrease in the temperature of the vaporization section, and a good combustion state can be maintained.Also, even in an oxygen-deficient state, the tendency of the flame rod current to decrease can be ensured. Appropriate detection becomes possible.

Further, according to the combustion apparatus of the second aspect, the effect of the combustion amount correction operation is reliably detected without erroneous detection due to an unstable change in the temperature of the vaporization section after the combustion combustion amount correction operation. be able to. In addition, when the vaporization section temperature is recovered to the combustion amount correction level by the correction operation, the combustion amount control is continued with the corrected combustion amount as the lower limit, so that the combustion amount at the time of weak combustion is equal to or more than a specified value. , And a required vaporization section temperature can be secured.

According to the combustion apparatus of the third aspect, it is possible to determine whether the recovery factor of the vaporization section temperature is due to the improvement of the heat recovery rate by the combustion amount correction operation or the heating by the heater. Only in the case of the recovery of the vaporization section temperature due to the rise, the combustion amount correction operation can be canceled to secure an appropriate correction operation.

Further, according to the combustion apparatus of the fourth aspect, it is possible to correct the difference in the heat recovery temperature due to the amount of combustion, accurately detect the recovery state of the vaporization section temperature, and secure an appropriate correction operation.

According to the combustion apparatus of the fifth aspect, erroneous detection due to heating of the heater can be reliably prevented.

According to the combustion apparatus of the sixth aspect, if the combustion amount correction operation is performed even once after the start of operation by lowering the temperature of the vaporizer, the lower limit value of the combustion amount set value at the start of the subsequent operation By setting the combustion amount at the time of weak combustion to a value larger than the initial set value, to prevent the tendency of the combustion amount to decrease,
An appropriate vaporization section temperature can be secured.

[Brief description of the drawings]

FIG. 1 is an operation block diagram of a combustion device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a hot air heater using the same device.

FIG. 3 is a flowchart showing an operation state of the apparatus.

FIG. 4 is a diagram showing a relationship between a vaporization section temperature and a combustion amount in the apparatus.

FIG. 5 is a configuration diagram of a conventional combustion device.

[Explanation of symbols]

 24 Pump 32 Vaporizer 42 Heater 44 Burner 49 Temperature detector 52 Combustion amount setting means 53 Vaporizer temperature detector 58 Judgment unit 59 Combustion amount correction unit 64 Return confirmation unit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazutada Momoda 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. F term (reference) 3K005 AA06 AB03 AC05 BA05 CA05 DA05 GB05 GC01 HB06 JA04 RA01 3K052 AA07 AB06 AC03 CA12 3K068 AA11 AB20 AB23 BB01 CA16

Claims (6)

[Claims] 1. A combustion amount setting means for setting a combustion amount according to a room temperature and a set temperature, a fuel supply means for supplying fuel, a vaporizing section for vaporizing the supplied fuel, a heater for heating the vaporizing section, A burner section for burning the gas vaporized in the vaporizing section, a temperature detector disposed in the vaporizing section, a vaporizing section temperature detecting section for detecting a vaporizing section temperature by a signal from the temperature detector, A determining unit for determining a temperature decrease;
A return confirmation unit that confirms a return state of the vaporization unit temperature; and a combustion amount correction unit that increases a combustion amount by a predetermined amount based on an output signal of the determination unit. The combustion amount correction operation is performed by the combustion amount setting unit. In a state where the combustion amount set value has dropped to a predetermined range including “weak” combustion, and when the vaporization unit temperature has dropped below the predetermined temperature set by the determination unit, the number of times set in advance via the combustion amount correction unit A combustion device in which the amount of combustion is corrected to increase. A determination section having a combustion amount correction level set higher than a normal heater ON control temperature and a first timer means, and when the vaporization section temperature falls below the combustion amount correction level, the combustion amount correction section outputs A signal is output, and the first timer means is operated to continue the combustion amount correction operation when the vaporization unit temperature after the lapse of a predetermined time does not reach the combustion amount correction level. The combustion apparatus according to claim 1, wherein the combustion amount control operation is performed with the correction amount at that time as a lower limit value of the combustion amount set value. 3. A return confirmation unit, comprising: a combustion amount correction release level set higher than a combustion amount correction level set by the correction unit;
A timer means for activating the second timer means when the vaporization section temperature after the combustion amount correction operation becomes equal to or higher than the combustion amount correction release level, and the vaporization section temperature after a predetermined time becomes equal to or higher than the combustion amount correction release level; 2. The combustion device according to claim 1, wherein the combustion correction operation is canceled via the combustion amount correction unit and the lower limit of the combustion amount set value is set to a predetermined value. 4. The combustion apparatus according to claim 3, wherein the combustion amount release level is changed according to the combustion amount. 5. The combustion apparatus according to claim 3, wherein the second timer means is set to be longer than a time required until the temperature of the vaporization section after the heater is turned on becomes lower than the combustion release level. 6. The combustion apparatus according to claim 1, wherein the lower limit value of the set combustion amount is set to a predetermined value when restarting the combustion operation after performing one or more combustion amount correction operations.