JP2000179845A - Combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong total combustible time by detecting adhesion state of tar to the carburetor chamber of a combustor based on the temperature thereat and performing a tar removing work conveniently through heating operation of a heater after stopping operation. SOLUTION: A combustor comprises a fuel supply means 24, a carbureting section 32 arranged with a chamber 37 for carbureting supplied fuel, a heater 42 for heating the carbureting section 32, a temperature detector 49 disposed at the section 32, a section 51 for operating the temperature at the carbureting section based on a signal received from the detector 49, a nozzle 34 for ejecting vaporized gas, a solenoid 50 for opening/closing the nozzle 34 provided with a needle valve 50b at the forward end thereof, a burner section 44 for combusting vaporized gas, and a section 57 for controlling the combustion operation based on a signal from an operating section 56. Upon delivery of an operation stop signal from the operating section 56, the section 57 controls heating operation of the heater 42 according to a specified sequence based on the temperature at the carbureting section 32.

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 a liquid fuel and ejecting the vaporized gas from a nozzle for combustion.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 9, a combustion apparatus of this type is energized and heated by a heater 2 embedded in a vaporizing section 1.
By detecting the temperature of the vaporizing section by the temperature detecting means 4 by the temperature detector 3 provided at an appropriate position of the vaporizing section 1, the temperature of the vaporizing section 1 is controlled to a predetermined temperature via the heater control section 5. I have. Then, a liquid fuel is supplied by a pump 7 to the vaporizing section 1 held at a high temperature by a controller 6 based on a predetermined sequence, and a vaporizing chamber 10 provided in the vaporizing section 1 is provided.
And blown to the burner section 8 through the nozzle 11 through the nozzle 11.
Is mixed with the air for combustion supplied by the above and supplied and burned.

The output of the pump 7 and the blower 9 is increased or decreased to control the amount of combustion based on a set value of the amount of combustion determined by the room temperature and the set temperature. The operation is stopped, and after a predetermined fire extinguishing sequence, the operation is stopped.

[0004]

However, such a conventional combustion apparatus has a problem in that when a defective kerosene such as a deteriorated oil which has been stored and oxidized for a long period of time or a different kind of oil mixed with a different component is used as a fuel, the vaporization unit is not used. Tar is generated in the porous portion of the vaporization accelerating material that vaporizes the fuel in the vaporization chamber 10 disposed in 1 and causes clogging, resulting in poor combustion due to poor vaporization, and further clogging causes the clogging itself. There is a problem that poor combustion occurs.

In other words, when clogging occurs and poor vaporization progresses, the internal pressure of the vaporization chamber 10 does not increase, the vaporization of the vaporized gas from the nozzle 11 becomes weak, and the fuel is injected from the nozzle 11 as a liquid. Then, the ejector effect due to the ejection is weakened, the suction amount of the primary air is reduced, and the combustion state of the burner unit 8 is deteriorated, and pulse combustion, odor, soot, carbon monoxide, which greatly changes the flame form,
Eventually it will misfire.

Further, the clogging of the vaporization promoting material particularly near the fuel inlet of the vaporization chamber 10 hinders the fuel from entering the vaporization chamber 10, and causes the vaporization chamber 10 to be supplied to the vaporization chamber 10 with respect to the supply amount from the pump 7. The amount of fuel entering, that is, the amount of vaporization decreases, and even if the internal pressure of the vaporization chamber 10 increases, the amount of combustion decreases, and finally, the combustion becomes weak, the flame form becomes extremely small, and the combustion limit is exceeded, generating odor. Or misfire.

[0007] Therefore, conventionally, when tar adheres to the vaporizing section and combustion is poor as described above, the tar removing operation has been performed by performing a cleaning operation of the vaporizing section which is completely different from a normal operation. In other words, an extremely laborious operation of removing all the fuel in the oil supply path, heating the vaporization section to a predetermined temperature, and sending air to the oil supply path to remove tar is required.

However, in a slight stage where the accumulation of tar components in the vaporization chamber 10 starts to change the combustion state, the vaporization capacity is restored by raising the temperature of the vaporization section 1 to a predetermined temperature or higher, and the vaporization is temporarily stopped. The combustion state returns to normal combustion.

[0009] The present invention has been made in view of the above problems,
It is an object of the present invention to recover the vaporization ability without requiring any special trouble by performing a cleaning operation of the vaporizer by raising the temperature of the vaporization section to a predetermined temperature or higher after stopping the combustion.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a fuel supply means, a vaporization section provided with a vaporization chamber for vaporizing supplied fuel, and a heater for heating the vaporization section. A temperature detector provided at an appropriate position of the vaporization unit, a temperature calculation unit for obtaining a vaporization unit temperature from a signal of the temperature detector, a nozzle for ejecting vaporized gas, and a needle valve at a tip end, the nozzle having An electromagnetic solenoid that opens and closes, a burner unit that burns vaporized gas, and a control unit that performs a combustion operation based on a signal from an operation unit.The control unit outputs a temperature when an operation stop signal is output from the operation unit or the like. The heating operation of the heater is performed based on a predetermined sequence according to the output of the arithmetic unit.

[0011] According to the above invention, since the heating operation of the heater is performed in accordance with the temperature of the vaporizing section at the time of stopping the combustion, if a change in the temperature of the vaporizing section confirms the state of tar adhesion, the vaporization after the combustion is stopped. The temperature of the vaporizing section can be raised to a predetermined temperature or higher, and the vaporizing section can be heated to remove tar adhesion in the vaporizing chamber. Without special operation, the vaporizing capacity can be recovered, and the tar resistance can be extremely improved. Improved and long-term use is possible.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The combustion apparatus according to claim 1 of the present invention
Fuel supply means, a vaporizing section provided with a vaporizing chamber for vaporizing the supplied fuel, a heater for heating the vaporizing section, a temperature detector provided at an appropriate position in the vaporizing section, and a signal from the temperature detector. A temperature calculation unit for further calculating the vaporization unit temperature, a nozzle for ejecting the vaporized gas, an electromagnetic solenoid having a needle valve at the tip to open and close the nozzle, a burner unit for burning the vaporized gas, and signals from the operation unit A control unit that controls the load to perform a combustion operation based on the control unit.When the operation stop signal is output from the operation unit, the control unit performs a heating operation of the heater based on a predetermined sequence according to an output of the temperature calculation unit. I'm trying to do it.

Since the heating operation of the heater is performed in accordance with the temperature of the vaporizing section at the time of stopping the combustion, if a change in the temperature of the vaporizing section indicates that the tar has adhered, the temperature of the vaporizing section is set to a predetermined value after the combustion is stopped. It is possible to remove the tar adhesion in the vaporization chamber by raising the temperature above the temperature and heating the vaporization section, and to recover the vaporization capacity without performing any special operation.
The tar resistance is significantly improved, and long-term use is possible.

According to a second aspect of the present invention, the control unit performs the heater heating operation based on a predetermined sequence when the temperature of the vaporization unit when the operation stop signal is output from the operation unit is lower than a predetermined temperature. ing.

[0015] When the temperature of the vaporizing section falls below a predetermined temperature, defective vaporization, that is, abnormal combustion due to tar adhesion is quickly detected, and after the operation is stopped, the vaporizing section is heated to remove tar adhesion in the vaporizing chamber. Therefore, the vaporization ability can be restored, the tar resistance can be extremely improved, and long-term use is possible.

According to a third aspect of the present invention, the control unit performs the heating operation of the heater in synchronization with the nozzle closing operation of the needle valve when the operation stop signal is output from the operation unit.

The heater heating operation after the stoppage of the operation when the tar adhesion failure is detected is performed in synchronization with the operation of the electromagnetic solenoid, so that the reliability of the operation is ensured and the circuit configuration is simplified. be able to.

Further, in the combustion apparatus according to a fourth aspect, the control unit has timer means for starting operation when an operation stop signal is output from the operation unit, and the heater is continuously or intermittently operated while the timer means is completed. The energization control is performed.

Further, by performing the heater heating operation at the time of detecting the tar adhesion failure using the timer means, an arbitrary cleaning operation time can be set, so that the tar can be properly removed from the vaporization chamber and the vaporization ability can be reliably recovered. Can be achieved.

Further, in the combustion apparatus according to the fifth aspect, when the operation section outputs the operation stop signal from the operation section, the control section performs the heating operation of the heater until the vaporization section temperature reaches a predetermined temperature.

Further, by performing the heater heating operation after the stoppage of operation when the tar adhesion failure is detected by using the operation result of the temperature operation section, a reliable cleaning temperature can be secured, and the heat resistance and vaporization of the vaporization section can be secured. A well-balanced cleaning operation such as recovery of performance can be performed.

Further, in the combustion apparatus according to claim 6, the temperature detector comprises a first temperature detector provided near the inlet of the vaporization chamber, and a second temperature detector provided in the vaporization section near the nozzle. The heater heating operation is performed when the output of the temperature calculator for calculating the temperature difference between the inlet and the outlet of the vaporization chamber from the first temperature detector and the second temperature detector is equal to or less than a predetermined value.

Then, the tar adhesion failure in the vaporization chamber is reliably and quickly detected by the output from the temperature calculation unit which computes the temperature difference between the inlet and the outlet of the vaporization chamber for vaporizing the fuel, and the tar adhesion failure is detected. During operation, the vaporization section is heated after the operation is stopped to remove tar adhesion in the vaporization chamber, so that the vaporization capacity can be recovered, the tar resistance can be significantly improved, and long-term use is possible. Become.

Further, since the cleaning operation at the time of tar adhesion is automatically performed based on the signal of the detecting means, wasteful power consumption is suppressed, an effective cleaning operation is realized, and maintenance performance and usability are improved. It can be greatly improved.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) The configuration of a hot air heater using a combustion apparatus according to Embodiment 1 of the present invention will be described with reference to FIG.

Reference numeral 21 denotes a main body case of the hot air heater. A tank 22 for holding liquid fuel is provided below the hot air heater, and a detachable cartridge tank 23 is provided above the tank 22. 24 is a pump mounted on the upper surface of the tank 22,
An oil feed pipe 25 is led out from the upper end to supply fuel to the combustion section 26.

Numeral 27 denotes a combustion cylinder 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 cylinder. Reference numeral 29 denotes a duct that 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.

A flame rod 31 is provided in the combustion section 26 so as to be in contact with the flame so as to monitor the combustion state.

Next, the detailed structure and operation of the combustion section 26 will be described with reference to the block diagram of FIG.

Numeral 32 denotes a vaporizing section, in which a circular burner receiving seat 33 is provided at an 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 working air is provided, 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, facing the nozzle 34, and the fuel gas ejected from the nozzle 34 and its fuel gas. Is mixed with the primary air sucked by the ejector effect by the ejection of the air.

Reference numeral 44 denotes a cantilever-shaped 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 large number 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.

Numeral 47 designates a frame rod disposed at a position facing the flame hole 44A provided in the burner portion 44 so as to be brought into contact with the flame, and by applying a predetermined voltage between the frame rod 47 and the burner portion 44. The flame current flows through the flame.

Numeral 48 denotes combustion confirmation means for detecting a flame current flowing through the frame rod 47, extracting the flame current as a flame rod output, and confirming a combustion state. Reference numeral 49 denotes a vaporizer temperature detector provided in the vaporizer 32 near the nozzle 34 to detect a heat recovery temperature due to combustion heat, 50 denotes a solenoid that drives a needle valve 50b that opens and closes the nozzle 34, and 50a denotes a solenoid that controls the solenoid 50 It is a drive control unit.

Reference numeral 51 denotes a vaporization unit 3 based on a signal from the temperature detector 49.
Reference numeral 52 denotes a temperature calculation unit that extracts a temperature signal as a temperature signal, and reference numeral 52 denotes a comparison value setting unit that sets a comparison value to be compared with the temperature signal of the temperature calculation unit 51. Reference numeral 53 denotes a comparison unit that compares the temperature signal of the temperature calculation unit 51 with the comparison value set by the comparison value setting unit 52, and outputs an output when the vaporization unit temperature is smaller than the comparison value.
Numeral 54 denotes tar adhesion detecting means for detecting the state of tar adhesion in the vaporization chamber 37 based on the result of the comparison unit 53, and 55 controls the heater 42 in a predetermined sequence when a signal is output from the tar adhesion detecting means 54 when the operation is stopped. A heater control unit 56 performs an operation instruction and the like, and an operation unit 57 controls a predetermined combustion operation in accordance with the operation instruction of the operation unit 56.

The operation of the above configuration will be described. The tank 22 is maintained at a constant oil level from the cartridge tank 23.
Is pumped up from the tank 22 by the pump 24 and sent to the vaporization chamber 37 of the combustion unit 26 via the oil supply pipe 25. The fed fuel is vaporized in the vaporization chamber 37 maintained at a predetermined temperature or higher by the heater 42 and becomes a high pressure and is ejected from the nozzle 34. At this time, the primary air is sucked by the ejector effect and the downstream side of the vaporization chamber 37 The mixture is supplied into the burner section 44 after being mixed in the provided mixing pipe 43, and is ejected from the flame hole 44A and burned. The generated combustion exhaust gas flows above the combustion cylinder 27, is mixed with the indoor air flow from the blower 28 in the duct 29, is discharged as warm air, and is used for heating. Then, the control device 30 controls the heater 42, the pump 24, the blower 28 solenoid 52, and the like in a predetermined sequence based on the conditions set by the operation unit 59, to start and stop the operation, and to control the amount of combustion. Performs variable operation control.

Next, the combustion in the burner section 44 will be described. The fuel gas ejected from the nozzle 34 flows into the mixing pipe 43 provided on the downstream side of the vaporization chamber 37 while sucking the primary air by the ejector effect, is mixed, and is discharged from the upper opening into the burner 44 and mixed. It flows back around the outer periphery of the pipe 43, is sufficiently mixed, and is ejected from a large number of flame holes 44A provided on the peripheral wall below the burner portion 44 to burn.

At this time, the mixed gas returns to the burner section 44 and flows around the mixing pipe 43, where diffusion mixing and uniform pressure are promoted, and the mixed gas is jetted out uniformly from the flame hole 44A to form a uniform flame. I do. The flame formation direction is controlled to be upward by a burner ring 45 provided on the outer periphery of the flame so that stable combustion without lift is performed. Further, the heat receiving flange 46 is heated by the flame formed in the flame hole 44A of the burner portion 44, and the temperature of the vaporizing chamber 37 is maintained at a certain temperature or more by the heat recovery action from the flame. It is possible to reduce part or all of the energization. A flame rod 47 is provided in the vicinity of the flame hole 44A so as to face the flame hole 44A. A flame current flowing through the flame between the flame rod 47 and the burner section 44 is detected by a combustion confirmation section 48. By comparing with a predetermined determination level, a change in combustion operation such as poor combustion is confirmed.

The vaporization of the fuel supplied to the burner section 44 will be described. A vaporizing element 41 having a cylindrical brush shape is disposed in the vaporizing chamber 37, and the fuel that has entered the vaporizing chamber 37 uses the inner wall of the vaporizing chamber 37 maintained at a high temperature or the vaporizing element 41.
, And is vaporized and ejected from the nozzle 34. If defective fuel is mixed in at that time, first, the fuel entering from the oil supply pipe 25 is gradually vaporized in the process of reaching the nozzle 34, and at this time, the fuel is mixed with the vaporized gas of the normal fuel. The defective component flows straight from the inlet of the vaporization chamber 37 to the nozzle 34 side as an insufficiently vaporized fuel vaporized gas, and on the way, contacts a large number of flocking lines 40 of the vaporization element 41 and is collected as a tar component. Therefore, nozzle 3
Since the vaporized gas reaching No. 4 does not include insufficiently vaporized fuel vaporized gas, the vaporized gas ejected from the nozzle 34 is ejected stably and combustion is stable.

However, when the tar component collected in the vaporizing element 41 accumulates, the capability of supplying the vaporized gas to the nozzle 34 is reduced, which affects the combustion state. Finally, the tar component accumulates in the entire vaporization chamber 37 and becomes clogged to lower the vaporization ability,
Insufficient vaporization eventually leads to misfire.

Therefore, if the accumulation of tar components affects the combustion state, the temperature detector 49 disposed in the vicinity of the nozzle 34 of the vaporizer 32 sends the temperature to the vaporizer 32 via the temperature calculator 51. To determine the temperature of
Based on this temperature, the state of accumulation of the tar component in the vaporization chamber 37 is detected. That is, when the tar component accumulates in the vaporization chamber 37, the amount of the fuel passing through the vaporization chamber 37 decreases due to the resistance of the tar component. Then, the amount of vaporized gas decreases due to the decrease in the amount of fuel passing, and the amount of combustion decreases, so that the heat recovery temperature detected by the temperature detector 49 also decreases. By comparing this temperature with the comparison value set by the comparison value setting section 52, the accumulation state of the tar component in the vaporization chamber 37 is detected early and reliably. A comparison unit 53 that compares the vaporization unit temperature obtained by the temperature calculation unit 51 with a comparison value
When the tar attachment detecting means 54 detects a state in which the combustion state is changed due to accumulation of the tar component in the vaporization chamber 37 by the signal of Even after the operation is stopped via the heater control unit 55, the heater 42 is energized in a predetermined sequence, and
By performing the heating operation of No. 2, the temperature of the vaporization chamber 37 is raised to a temperature suitable for tar removal to recover the vaporization ability.

That is, each time the combustion operation is stopped, the state of tar adhesion is detected based on the temperature of the vaporizing section 32 each time.
By controlling the heater heating operation after the combustion operation is stopped in accordance with the detection result, the vaporization capacity is stabilized through the removal of tar by heating the vaporization chamber 37, thereby enabling long-term use.

Next, the operation will be described in detail with reference to the flowchart of FIG. First, combustion is started by the control device 30 based on a predetermined combustion sequence.
9, the temperature of the vaporizing section 32 is checked via the temperature calculating section 51, and it is confirmed whether this temperature is higher or lower than the predetermined temperature set by the comparison value setting section 55. If this confirmation result is large, it is determined that tar accumulation in the vaporization chamber 37 has not occurred, and combustion is continued. And if it is small, it means that the heat recovery temperature is decreasing,
It is determined that the combustion is defective due to accumulation of the tar component in the vaporization chamber 37, and the operation is turned off. When the operation is turned off, the heater is turned on to start the heating operation of the vaporizing section 32, and the heating operation is continued for a predetermined time to remove tar in the vaporizing chamber 37.

As described above, when the temperature of the vaporization section falls below the predetermined temperature, it is determined that the combustion is defective due to accumulation of tar components in the vaporization chamber, and a predetermined heater heating operation is performed after the operation is stopped. The combustion time during the sticking combustion can be extended, and the usability is greatly improved.

(Embodiment 2) FIG. 4 is an operation block diagram using Embodiment 2 of the present invention. The same parts as those in Embodiment 1 are given the same numbers and their explanation is omitted.

In the second embodiment, when the tar adhesion detecting means 54 determines from the temperature of the vaporizing section 32 that combustion failure has occurred due to accumulation of tar components in the vaporizing chamber 37, the heater heating operation after the operation is stopped is stopped, and the nozzle 34 is stopped after the combustion is stopped. Is performed in synchronization with the operation of the solenoid 50 that is driven to close the block for a predetermined time, and a signal is supplied from the solenoid drive control unit 50a to the heater control unit 55.

As described above, by using the heating operation of the heater 42 together with the drive signal of the solenoid 50, the circuit configuration can be extremely simplified, and the heater heating operation after the combustion is stopped can be ensured.

(Embodiment 3) FIG. 5 is an operation block diagram using Embodiment 3 of the present invention. The same parts as those in Embodiment 1 are given the same numbers and their explanation is omitted.

In the third embodiment, a timer means 58 is provided in the control section 57, which operates for a predetermined time after the operation is stopped, and the temperature of the vaporization section 32 is used to detect the adhesion of tar components in the vaporization chamber 37 by the tar adhesion detection means 54. When it is determined that the operation is stopped, a signal is supplied from the timer means 58 to the heater control unit 55. After the operation is stopped, the heater 42 is energized continuously or intermittently for a predetermined time as shown in FIG. 6 to heat the vaporization chamber 37 to a predetermined temperature. The intermittent energization of the heater 42 is ON / O.
By changing the FF ratio sequentially, the temperature of the vaporization chamber 37 is stabilized at a predetermined temperature. For example, heater O
The N time is sequentially reduced as Ton1>Ton2> Ton3, and the heater OFF time is sequentially increased as Toff1 <Toff2 <Toff3.

As described above, by performing the heater heating operation after the operation is stopped using the timer means 58, it is possible to set an arbitrary cleaning operation time, and it is possible to appropriately remove the tar in the vaporization chamber and secure the vaporization ability. Can be recovered. In addition, by intermittently energizing the heater 42, the temperature of the vaporization chamber 37 during the cleaning operation can be maintained relatively stably, and the heat resistance of the vaporization section 32 and the recovery of the vaporization ability are balanced. The cleaning operation becomes possible.

(Embodiment 4) FIG. 7 is an operation block diagram using Embodiment 4 of the present invention. The same parts as those in Embodiment 1 are given the same numbers and their explanation is omitted.

In the fourth embodiment, when the tar adhesion detecting means 54 determines from the temperature of the vaporizing section 32 that combustion failure due to accumulation of tar components in the vaporizing chamber 37 has occurred, the heater heating operation after the operation is stopped is performed by the temperature calculating section 51. The operation is performed in accordance with the temperature, and the signal of the temperature calculation section 51 is supplied to the heater control section 55. The energization of the heater 42 is controlled using the temperature in the vicinity of the outlet of the vaporization chamber 37 where the temperature state of the vaporization chamber 37 can be accurately confirmed. The effect on heat resistance can be eliminated, and an effective cleaning operation can be performed.

(Embodiment 5) FIG. 8 is an operation block diagram using Embodiment 5 of the present invention. The same parts as those in Embodiment 1 are given the same numbers and their explanation is omitted.

The fifth embodiment aims to provide a proper tar removal operation by accurately detecting the state of tar adhesion to the vaporization chamber 37. First and second ports are provided at the entrance and the exit of the vaporization chamber 37, respectively. Temperature detector 49 and second temperature detector 59
Are provided, and an attempt is made to detect the state of tar adhesion based on the temperature difference obtained therefrom. That is, when the accumulation of the tar component affects the combustion state, the second temperature detector 5 disposed at the inlet of the vaporization chamber 37 is used.
9 and the first temperature detector 49 disposed at the outlet, the inlet temperature and the outlet temperature of the vaporization chamber 37 are obtained via the second temperature detector 60 and the first temperature detector 49a. The temperature difference between the inlet and the outlet of the vaporization chamber 37 is calculated and obtained by inputting to the temperature calculation section 51, and the accumulation state of the tar component in the vaporization chamber 37 is detected based on the value of this temperature difference. ing. That is, in a state where the tar component is not accumulated in the vaporization chamber 37, the amount of the fuel supplied from the oil supply pipe 25 passes through the vaporization chamber 37 as it is. Decrease. Thus, the temperature difference between the inlet and the outlet of the vaporization chamber 37 calculated by the temperature calculator 51 shows a large value.

When the tar component accumulates in the vaporization chamber 37, the amount of the fuel passing through the vaporization chamber 37 decreases due to the resistance of the tar component. For this reason, the effect of cooling the temperature at the inlet of the vaporization chamber 37 is reduced, and the temperature drop in the vicinity is small. Further, the amount of vaporized gas also decreases due to the decrease in the amount of fuel passed, and the amount of combustion decreases, so that the heat recovery temperature detected by the first temperature detector 49 also decreases. As a result, the temperature difference between the inlet and outlet of the vaporization chamber 37 calculated by the temperature calculator 51 shows a small value. By comparing this temperature difference with the comparison value set by the comparison value setting section 52, the accumulation state of the tar component in the vaporization chamber 37 is detected early and surely. When the tar adhesion detecting means 54 detects a state in which the combustion state is changed due to the accumulation of the tar component in the vaporization chamber 37 based on a signal from the comparison section 53, an operation stop instruction is issued from the operation section 56. If so,
Even after the operation is stopped via the heater control unit 55, the heater 42 is energized in a predetermined sequence to perform the heating operation of the vaporization unit 32, thereby raising the temperature of the vaporization chamber 37 to a temperature suitable for tar removal. I try to restore my abilities.

[0059]

As described above, according to the combustion apparatus of the first aspect, since the heating operation of the heater is performed according to the temperature of the vaporizing section at the time of stopping the combustion, the tar adhesion state is caused by the change of the vaporizing section temperature. Is confirmed, after the combustion is stopped, the temperature of the vaporizing section is raised to a predetermined temperature or higher, and the vaporizing section can be heated to remove tar adhesion in the vaporizing chamber, and the vaporizing capacity can be restored without performing any special operation. It is possible to achieve extremely high tar resistance and use for a long period of time.

Further, according to the combustion apparatus of the second aspect, since the temperature of the vaporizing section has dropped to a predetermined temperature or lower, defective vaporization, that is, abnormal combustion due to tar adhesion is quickly detected, and the vaporizing section is stopped after the operation is stopped. Since the heating removes the tar adhesion in the vaporization chamber, the vaporization ability can be recovered, the tar resistance can be extremely improved, and long-term use is possible.

According to the combustion apparatus of the third aspect, the heater heating operation after the stoppage of the operation when the tar adhesion failure is detected is performed in synchronization with the operation of the electromagnetic solenoid, thereby ensuring the reliability of the operation. In addition, the circuit configuration can be simplified.

According to the combustion apparatus of the fourth aspect, by performing the heater heating operation at the time of detecting the tar adhesion failure using the timer means, an arbitrary cleaning operation time can be set, and an appropriate vaporization chamber can be set. Tar removal and reliable recovery of vaporization ability.

According to the combustion apparatus of the fifth aspect, the heater heating operation after the stoppage of operation when the tar adhesion failure is detected is performed by using the calculation result of the temperature calculation unit, so that a reliable cleaning temperature is ensured. As a result, a cleaning operation with a good balance between the heat resistance of the vaporizing section and the recovery of the vaporizing ability can be performed.

Further, according to the combustion apparatus of the sixth aspect, the tar adhesion failure in the vaporization chamber can be reliably and quickly performed by the output of the temperature calculation section for calculating the temperature difference between the inlet and the outlet of the vaporization chamber for vaporizing the fuel. In addition to the detection, when the tar adhesion failure is detected, the vaporization section is heated after the operation is stopped to remove the tar adhesion in the vaporization chamber, so that the vaporization ability can be recovered and the tar resistance can be improved. It is extremely improved and can be used for a long time.

Further, since the cleaning operation at the time of tar adhesion is automatically performed based on the signal of the detecting means, wasteful power consumption is suppressed, an effective cleaning operation is realized, and maintenance performance and usability are improved. It can be greatly improved.

[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 an operation block diagram of a combustion device according to a second embodiment of the present invention.

FIG. 5 is an operation block diagram of a combustion device according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a vaporizer temperature state and a heater operation state in the apparatus.

FIG. 7 is an operation block diagram of a combustion apparatus according to a fourth embodiment of the present invention.

FIG. 8 is an operation block diagram of a combustion device according to a fifth embodiment of the present invention.

FIG. 9 is a configuration diagram of a conventional combustion device.

[Explanation of symbols]

 24 pump 32 vaporizer 34 nozzle 42 heater 44 burner 49 temperature detector 50 solenoid 50b needle valve 51 temperature calculator 56 operation unit 57 control unit

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Shigeru Murakami 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 3K005 GB09 HA00 JA04

Claims (6)

[Claims] 1. A fuel supply means, a vaporizing section provided with a vaporizing chamber for vaporizing supplied fuel, a heater for heating the vaporizing section, a temperature detector provided at an appropriate position of the vaporizing section, A temperature calculation unit that obtains a vaporization unit temperature from a signal of a temperature detector, a nozzle that ejects vaporized gas, an electromagnetic solenoid that opens and closes the nozzle having a needle valve at the tip, and a burner unit that burns the vaporized gas, A control unit for performing a combustion operation based on a signal from an operation unit, wherein the control unit is configured to output the heater based on a predetermined sequence according to an output of the temperature calculation unit when an operation stop signal is output from the operation unit. A combustion device that performs a heating operation. 2. The combustion unit according to claim 1, wherein the control unit performs the heater heating operation based on a predetermined sequence when the temperature of the vaporization unit when the operation stop signal is output from the operation unit is equal to or lower than a predetermined temperature. apparatus. 3. The combustion apparatus according to claim 1, wherein the control unit performs a heating operation of the heater in synchronization with the nozzle closing operation of the needle valve when the operation stop signal is output from the operation unit. 4. The control unit has timer means for starting operation when an operation stop signal is output from the operation unit, and controls the heater to be continuously or intermittently energized while the timer means completes its operation. The combustion device according to claim 1 or 2, wherein: 5. The combustion apparatus according to claim 1, wherein the control unit performs a heating operation of the heater when the operation stop signal is output from the operation unit until the vaporization unit temperature reaches a predetermined temperature. 6. A temperature detector comprising: a first temperature detector provided near an inlet of a vaporization chamber; and a second temperature detector provided in a vaporization section near a nozzle.
When the output of a temperature calculation unit for calculating the temperature difference between the inlet and the outlet of the vaporization chamber from the first temperature detector and the second temperature detector is equal to or less than a predetermined value, the heater heating operation is performed. The combustion apparatus according to any one of claims 1 to 5, wherein the combustion is performed.