JP2000234707A - Combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption in combustion equipment for combusting kerosene for domestic use. SOLUTION: Combustion equipment comprises an air heater 20 for blowing heated air toward a vaporization surface 16 in order to vaporize fuel, and conducts ignition in a short time, and therefore an electric heat generating portion for preheating a vaporizer 13 body is not required. Accordingly, no power is consumed by the vaporizer 13 and thus an effect of reducing power consumption of the combustion equipment as a whole can be attained. The vaporizer 13 can be promptly set up to a given temperature, thereby preventing power consumption of the vaporizer 13 in a stand-by condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater, a heater and the like used in a home, and particularly to a combustion device.

[0002]

2. Description of the Related Art A conventional combustion apparatus of this kind is disclosed in Japanese Unexamined Patent Publication No.
What was described in 31603 gazette was common. As shown in FIG. 8, this combustion device ejects a liquid fuel from a nozzle 1 and a carburetor 3 having an electric heater 2 embedded therein, and primary air provided for introducing combustion air into the carburetor 3. A passage 4, a mixing chamber 5 for uniformly mixing a combustible air-fuel mixture obtained by mixing the fuel vaporized by the carburetor 3 and the combustion air, and a flame port 6 provided at an upper portion of the mixing chamber 5.
And a secondary air passage 7 provided in the vicinity of the flame port 6;
An end of the secondary air passage 7 is provided so as to surround the vaporizer 3, the mixing chamber 4, and the periphery of the flame port 6, and part of an air passage 8 configured to open the upper part of the flame port. It is opened so as to penetrate the side wall 9.

The liquid fuel is supplied as droplets from a nozzle 1 to a vaporizer 3 in which an electric heater 2 is embedded.
It is heated and vaporized. On the other hand, a part of the combustion air is introduced into the carburetor 3 from the primary air passage 4 and mixed with the vaporized fuel to form a combustible air-fuel mixture. It forms a blue flame and is burned. On the other hand, the remaining air is supplied from the secondary air passage 7 to the flame port 6 and used for combustion.

[0004]

However, in the above-described conventional combustion apparatus, since the carburetor 3 is heated by the electric heater 2, it takes time to raise the carburetor 3 to a predetermined temperature. There was a problem that fuel could not be ignited and power consumption was large. In addition, in order to immediately operate the combustion device, it is necessary to heat the vaporizer 3 to a predetermined temperature, and there is a problem that the power consumption is large.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an air heater provided to a vaporizing surface in a vaporizer, a fuel nozzle for ejecting fuel to the vaporizing surface, and a fuel nozzle. A fuel supply means for supplying fuel is provided.

According to the above invention, the fuel supplied to the vaporizing surface is heated by the heated air from the air heater to form a vaporized gas. The vaporized gas is sent to a flame outlet, where ignition is performed in a short time. Also, the vaporizer receives the heat of the flame above the flame,
If the temperature of the vaporized surface rises, even if the heating by the air heater is stopped, it can be vaporized by the heat of the vaporized surface. Therefore, the fuel can be vaporized only by the short-time power consumption at the time of ignition, and there is no need to heat the vaporizer main body, and the power consumption can be reduced. Further, since the vaporized gas can be formed in a short time by the air heater, ignition can be performed in a short time at the time of starting the combustion device, and standby electric power for standby of the vaporizer can be eliminated.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A combustion apparatus according to a first aspect of the present invention includes a vaporizer for vaporizing a liquid fuel, a vaporizing surface formed by a part of the vaporizer, and a fuel nozzle for supplying fuel to the vaporizing surface. And an air heater having a negative end provided toward the vaporizing surface and holding the heating element.

Then, the fuel supplied to the vaporizing surface is heated in a short time by receiving the heated air from the air heater, sent to the flame outlet as a vaporized gas, and ignited in a short time.

A combustion apparatus according to a second aspect of the present invention has air supply means for the air heater independent of the combustion air blowing means.

[0010] Then, the fuel supplied to the vaporizing surface at the time of starting is sent from an independent air supply means to the air heater, and is heated in a short time by receiving the high-speed heated air formed by the air heater. The gas is sent to the flame outlet as a vaporized gas, and can be ignited in a short time.

A combustion apparatus according to a third aspect of the present invention includes a vaporizing surface temperature detecting means for detecting a vaporizing surface temperature, and a control unit for controlling a heating operation of the air heater based on a value detected by the vaporizing surface temperature detecting means. Have.

When the temperature of the vaporizing surface is detected and the temperature of the vaporizing surface becomes lower than the predetermined temperature due to the variation of the fuel supply or the air supply, the output of the air heater is adjusted while the output of the air heater is adjusted. Since the fuel is completely vaporized on the vaporized surface so that the unvaporized fuel does not fall, a stable supply of vaporized gas can be achieved.

According to a fourth aspect of the present invention, there is provided a combustion apparatus having a blast temperature detecting means for detecting a blast temperature and a control unit for controlling a heating operation of the air heater based on a value detected by the blast temperature detecting means.

If the temperature of the combustion air is lower than a predetermined temperature by detecting the air blowing temperature, the operation is performed while adjusting the output of the air heater to prevent unvaporized fuel from falling from the vaporizing surface. Since the fuel is completely vaporized on the vaporization side, a stable supply of vaporized gas can be provided, and it can respond to a change in climate.

[0015] The combustion apparatus according to claim 5 of the present invention has a control unit for controlling the heating operation of the air heater in accordance with the amount of combustion.

Further, since the control unit controls the combustion amount and the heating operation of the air heater, even if the temperature of the vaporizing surface rises, the heating air of the air heater remains stable until the entire vaporizer is stabilized at a uniform temperature. Since the air is blown, the fuel is completely vaporized so that the unburned portion of the fuel is not ejected from each part of the vaporizer, and a stable supply of vaporized gas can be performed.

The combustion device according to claim 6 of the present invention has a control unit for controlling a heating operation for heating the air heater to a temperature higher than a predetermined heating temperature.

[0018] Heating air is sent from the air heater to the vaporized surface regularly or at the beginning of use during the season, and the vaporized surface is baked to remove tar and dust attached to the surface. The vaporized state can be maintained.

A combustion device according to a seventh aspect of the present invention has a control unit for operating independent air supply means when the combustion is stopped, and controlling the blowing of cooling air via an air heater on the vaporizing surface. .

Then, the vaporizing surface is rapidly cooled by the cooling air supplied to the vaporizing surface, and the surrounding area is also cooled to lower the temperature. Therefore, the temperature of the fuel nozzle is lowered, and the fuel nozzle is clogged due to tar generation. And a proper state can be maintained for a long period of time.

[0021]

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

(Embodiment 1) FIG. 1 is a sectional view showing a main part of a combustion apparatus according to Embodiment 1 of the present invention.

In FIG. 1, kerosene, which is a liquid fuel, is sucked up from a fuel tank (not shown) by a fuel pump 10 as a fuel supply means, and the fuel nozzle 1
2 is supplied. The fuel nozzle 12 has a fine fuel ejection hole formed of a material having high hardness such as steel, brass, ceramics, and glass. The fuel pump 10 includes a positive displacement pulse pump having a cylinder, a rotary pump, and the like. Reference numeral 13 denotes a carburetor provided in front of the fuel nozzle 12 and having the tip of the fuel nozzle 12 inserted therein. The vaporizer 13 is made of a heat-resistant material with good heat conductivity, such as aluminum, aluminum alloy such as aluminum die-cast or duralumin, brass, copper, steel, cast iron and the like. Aluminum, brass, copper, with an opening 14 partially provided on the side of the vaporizer 13
A vaporizer lid 15 made of a material having good heat conductivity such as cast iron is provided. The fuel nozzle 12 is inserted through the opening 14 toward the carburetor 13. On the opposite side of the tip of the fuel nozzle 12, the fuel nozzle 1
2, a vaporizing surface 16 having a flat portion and a raised portion at the end is provided. The end of the vaporizing surface 16 extends to the vicinity of the vaporizer lid 15 via a gap 17 serving as a vaporized gas passage. The inner wall of the vaporizer 13 including the upper surface of the vaporizing surface 16 is formed of silicon or a metal oxide, and is coated with a heat-resistant paint having slightly coarse particles. The inside of the vaporizer 13
The inclined vaporizing surface 16 divides an upper vaporizing chamber 18 and a lower vaporizing passage 19. The upper vaporization chamber 18 has a side wall of the vaporizer 13 or an opening 1 of the vaporizer lid 15.
4, an air heater 20 is inserted above the vaporizing surface 16. The air heater 20 has a cylindrical heating passage 21 having both ends opened, and an electric heating element 22 incorporated in the heating passage 21. Heating element 22
Is a ceramic heater in which a heating wire such as nichrome or iron chrome or a heat generating portion is covered with a coating made of a material such as silicon nitride or alumina in a plate shape or a disk shape, or an electromagnetic induction heater in which an iron tube is heated by an electromagnetic coil. It is composed of The heating passage 21 is made of heat-resistant steel, cast iron, copper, brass, quartz glass, or the like. The heating element 22 controls the heating operation by adjusting the power by a controller 24 via a lead wire 23 in order to perform appropriate temperature control. An air-fuel mixture outlet 25 composed of the lower vaporization passage 19 and the carburetor lid 15 is provided below the lower vaporization passage 19, and a material having a good heat conductivity such as aluminum, brass, copper, or cast iron is provided below the gas mixture outlet 25. A manufactured bowl-shaped transfer passage 26 is provided. Downstream of the transport passage 26, a plurality of porous flame ports 27 made of a heat-resistant material such as steel, iron, titanium, duralumin, or ceramic are provided. 28 is
In the burner case that covers the entire combustion part, the space inside the burner case is an air passage 29 provided so as to surround the carburetor 13, the conveyance passage 26, and the flame opening 27. 30 is
A cylindrical 2 having a large number of secondary air ejection holes 31 formed on the upper surface.
In the next air passage, a plurality of the flame holes 27 are alternately arranged so as to supply air to the vicinity of the flame holes 27. 32 is the flame outlet 2
A combustion chamber 33 is formed inside a side wall provided between the air passage 7 and the air passage 29. The end of the secondary air passage 30 penetrates the side wall 32 and opens to the air passage 29 side. Attachment of the flame outlet 27 is carried out by
This is performed by welding a part of the secondary air passage 30 and a plurality of spots. Reference numeral 34 denotes a fin-shaped heat receiving portion formed on the back surface of the vaporizer 13 so as to project into the combustion chamber 33. Heat receiving part 3
The inside of the vaporizer 13 in the vicinity of 4 is an upper vaporization chamber 18 provided near the vaporization surface 16. 36 is an air passage 29
Is a heat exchanger that is mounted on the top plate 35 so as to cover the upper part of the flame outlet 27. Reference numeral 37 denotes a blower for supplying combustion air. The impeller uses a turbo fan or a radial fan capable of generating high pressure, and is configured to rotate the motor by a motor. Connected to the blower passage 38. Fuel pump 10 and blower 37
Is combined with a controller 25 that controls the air heater 20, and the operation of the air heater 20 is controlled in accordance with the operation of the fuel pump 10 and the blower 37. An air heater 20 is provided inside the air passage 38 by a support portion 39, and is disposed at an appropriate position such that the heated air follows the vaporizing surface 16. Reference numeral 40 denotes a blue flame formed on the flame outlet 27. Reference numeral 41 denotes heating air that is a part of the combustion air flowing into the air heater 20.

Next, the operation and operation will be described. When a power supply (not shown) is turned on, the air heater 20 is energized.
When the heating element 22 is heated and reaches a predetermined temperature in a short time in seconds, the blower 37 is operated by the sequence of the controller 24 set in anticipation of the temperature and the combustion air is supplied. You. Part of the combustion air supplied to the air passage 38 is supplied into the heating passage 21 as heating air 41, and the other is distributed to the vaporizing air and the secondary air. The heated air heated by the heating element 22 blows out toward the vaporizing surface 16. At the same time, the fuel pump 10 is operated, and fuel is supplied from the fuel nozzle 12 through the oil feed pipe 11 to the carburetor 13.
It is dropped toward the vaporizing surface 16 inside. The fuel is vaporized by the direct heating of the vaporized surface 16 heated by the heated air or the fuel droplets by the heated air, and the opening 14 of the vaporizer lid 15 is formed.
While being mixed with the vaporizing air introduced into the vaporizer 13 from above, the gas is conveyed to the conveying passage 26 through the gas mixture jetting port 25, and is emitted as a uniform vaporized gas from the flame opening 27.
At this time, the vaporized gas is ignited by the discharge of the ignition electrode (not shown) and combustion is started. Then, the blue flame 40 formed on the flame opening 27 maintains stable combustion. Blue flame 4
Fin-shaped heat receiving portion 34 formed in the vaporizer 13
And the vaporizer 13 is heated. When the vaporizer 13 reaches a predetermined temperature, the energization of the air heater 20 is stopped according to a sequence of the controller 24 in anticipation of the state of the vaporizing surface 16 at this time. The fuel is vaporized on the wall of the vaporizing surface 16 of the high-temperature vaporizer 13, and the fuel can be vaporized without heating the air heater 20. Further, the secondary air passes through the air passage 29 inside the burner case 28 and is supplied to the secondary air ejection port 31 arranged near the flame opening 27 via the secondary air passage 30, so that the combustion chamber 33 Promotes the combustion of the blue flame 40. The blue flame 40 formed on the flame opening 27 is
The state is monitored by a blue flame detection unit (not shown) to maintain stable combustion. Thereafter, part of the heat of the blue flame 40 is received by the heat receiving unit 34, and the vaporizer 13 is maintained at a predetermined temperature. The high-temperature combustion gas generated by the combustion is supplied to the heat exchanger 36.
The heat is exchanged at and discharged.

The fuel is ejected from the fuel nozzle 12 toward the vaporizing surface 16 in the vaporizer 13 and is heated by the heated air of the air heater 20, so that the main body of the vaporizer 13 for heating and vaporizing the fuel is heated. Since there is no need for an electric heating means to perform the heating and no time is required for preheating, a vaporized gas can be formed and ignited in a short time.

The fuel is vaporized at the time of starting by the air heater 20, and the main body of the vaporizer 13 is heated by receiving the heat of the blue flame 40, and does not require heating parts such as an electric heating element, so that power consumption is reduced. it can.

The vaporizer 13 is heated to a predetermined temperature by a blue flame 40.
Since it is possible to quickly start up with the combustion heat of the above, it is not necessary to keep the vaporizer 13 at a predetermined temperature in advance, and the standby power can be eliminated.

Since the heated air is ejected from the air heater 20, the fuel can be spread along the vaporizing surface 16 while heating the fuel, and the vaporization can be promoted and the vaporization efficiency can be improved.

Since the heated air is ejected from the air heater 20, a high-temperature vaporized gas is formed on the vaporizing surface 16, so that the vaporized gas is prevented from being condensed in the transport passage 26 and the flame opening 27 and stable ignition is performed. Can be performed.

When the fuel is ejected from the fuel nozzle 12 toward the vaporizing surface 16 in the vaporizer 13, the fuel droplet itself can be directly heated by the heated air, so that the fuel can be vaporized in a short time.

Since the vaporizing surface 16 is provided with a downward slope and a flat portion or a raised portion is provided at the end, the fuel is stagnate in the passage of the heated air by the flat portion or the raised portion while spreading the fuel along the gradient. In addition, it is easy to apply heated air to promote vaporization.

Since the upper surface of the vaporizing surface 16 is formed of silicon or a metal oxide and coated with a heat-resistant paint having a slightly coarse particle, the fuel impregnates the coarse particle and spreads.
The expansion of the surface area makes it easier to apply heated air to promote vaporization.

(Embodiment 2) FIG. 2 is an enlarged sectional view showing a main part of a combustion apparatus according to Embodiment 2 of the present invention.

This embodiment is different from the first embodiment in that the air heater 20 is provided independently of the blower 37 and has a multi-stage turbo fan, a radial fan, and a positive displacement fan capable of increasing the blowing pressure. Air supply means 42 comprising a compressor, a pump, and the like constituted by cylinders; a cylindrical air supply path 43 connecting the air supply means 42 and the heating passage 21 of the air heater 20; , And the controller 44 controls the fuel pump 10, the blower 37, and the air supply means 42 in conjunction with each other.

The components having the same reference numerals as in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. The fuel supplied to the vaporizing surface 16 at the time of starting receives high-pressure and high-speed heated air sent to the air heater 20 from the independently provided air supply means 42. Since it is spread along the vaporization surface 16 and is heated in a short time and sent to the flame opening 27 as a vaporized gas, it is possible to ignite in a short time. Further, since the air supply means 42 capable of generating high-pressure air is provided separately from the blower 37, the air heater 20 and the air supply passage 43 can be made compact and can be easily inserted into the vaporizer 13. In addition, since the opening of the heating passage 21 is formed to be small, and the heated air can be concentrated on the falling portion of the fuel droplet on the vaporizing surface 16, an appropriate temperature required for vaporizing can be secured. Controller 4
4, the air supply means 42, the fuel pump 10, and the blower 3
7 and the fuel pump 1
The amount of air necessary for vaporization conforming to the supply amount of 0 is supplied by adjusting the air from the air supply means 42 and the blower 37, and good combustion can be performed.

(Embodiment 3) FIG. 3 is an enlarged sectional view showing a main part of a combustion apparatus according to Embodiment 3 of the present invention.

In this embodiment, Embodiment 1 (or 2)
The difference is that the heating operation of the air heater 20 is controlled by a vaporization surface temperature sensor 45 composed of a thermistor, a thermocouple or the like as a vaporization surface temperature detecting means for detecting the temperature near the vaporization surface 16 and the value of the temperature. That is, a controller 46 is provided. When the independent air supply means 42 is provided for the air heater 20 (not shown), the controller 46 controls the operation of the air supply means 42 in accordance with the heating operation of the air heater 20. It was done.

The components having the same reference numerals as in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. At the time of ignition, the temperature of the vaporizing surface 16 rises by the heated air from the air heater 20 and reaches a predetermined temperature.
When the detection is made at step 5, the controller 46 stops the operation of the air heater 20 so that unnecessary power is not generated in the air heater 20. Further, when the temperature of the vaporizing surface 16 becomes lower than a predetermined temperature due to the variation of the fuel supply or the air supply, the air heater 20 is operated to send the heated air, and the fuel that cannot be vaporized on the vaporizing surface 16 is removed. It can be completely vaporized to maintain stable vaporization. Since the heating operation of the air heater 20 can be controlled while constantly monitoring the temperature of the vaporizing surface 16,
The best vaporization can be performed while controlling the power consumption. When the independent air supply means 42 is provided, the controller 46 is controlled in accordance with the heating operation of the air heater 20.
Controls the operation of the air supply means 42 to adjust the amount of air, so that a vaporized gas having the best concentration can be formed.

(Embodiment 4) FIG. 4 is an enlarged sectional view showing a main part of a combustion apparatus according to Embodiment 4 of the present invention.

This embodiment is different from the first embodiment (or 2 or 3) in that a blower temperature sensor 47 composed of a thermistor, a thermocouple or the like is used as a blower temperature detecting means for detecting a blower temperature. The control unit 48 is provided near the inlet and controls the heating operation of the air heater 20 according to the temperature value. When an independent air supply means 42 is provided for the air heater 20 (not shown), the controller 48 controls the operation of the air supply means 42 in accordance with the heating operation of the air heater 20. It was done.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation and the operation will be described.
When it is assumed that the temperature of the vaporizing surface 16 becomes lower than the predetermined temperature by 7, the air heater 20 is operated to send heated air, and the fuel that cannot be completely vaporized on the vaporizing surface 16 is vaporized. Stable vaporization can be maintained. In addition, the input power of the air heater 20 is controlled by the controller 4 according to the level of the blast temperature.
8, the control can be performed so that the power is not consumed more than necessary. When the independent air supply means 42 is provided, the controller 48 controls the air heater 2.
Since the operation of the air supply means 42 is controlled and the amount of air is adjusted in accordance with the 0 heating operation, a vaporized gas having the best concentration can be formed.

(Embodiment 5) FIG. 5 is an enlarged sectional view showing a main part of a combustion apparatus according to Embodiment 5 of the present invention.

This embodiment is different from the first embodiment (or 2 or 3 or 4) in that the combustion is started, and even if the temperature of the vaporizing surface 16 rises, the combustion amount is reduced for a predetermined time. In addition, a controller 49 for controlling the heating operation of the air heater 20 is provided. When the independent air supply means 42 is provided for the air heater 20 (not shown), the controller 49 controls the operation of the air supply means 42 in accordance with the heating operation of the air heater 20. It was done. The controller 49 controls the air supply means 42.
And the fuel pump 10 and the blower 37 are controlled in conjunction with each other.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described.
Even if the temperature of the vaporizing surface 16 rises, the air heater 20 is controlled until the entire vaporizer 13 is stabilized at a uniform temperature.
Since the heated air is blown, each part of the vaporizer 13 is heated to a slightly higher temperature and completely vaporized so that the unburned portion of the fuel is not ejected from each part of the vaporizer 13, so that the vaporized gas is stably generated. Be able to supply. In particular, when a large fuel flow rate is supplied after the vaporizer 13 has risen to a predetermined temperature, generation of unvaporized fuel due to a local temperature drop is likely to occur. In addition, generation of unvaporized fuel can be prevented. When an independent air supply means 42 is provided for the air heater 20, the amount of air necessary for vaporization corresponding to the supply amount of the fuel pump 10 is determined by the instruction of the controller 49.
Since the air from the air supply means 42 and the air from the blower 37 are adjusted together, a vaporized gas having the best concentration can be formed, and good combustion can be maintained.

(Embodiment 6) FIG. 6 is an enlarged sectional view showing a main part of a combustion apparatus according to Embodiment 6 of the present invention.

This embodiment is different from the first embodiment (or 2 or 3 or 4 or 5) in that the air heater 20
Is different from the mode of the predetermined heating operation, the storage unit 5 in which the mode of heating to a temperature higher than the predetermined heating temperature is incorporated.
0 and a control unit 51 for controlling the operation of the air heater 20 and the blower 37 in accordance with the instruction of the storage unit 50. When the independent air supply means 42 is provided for the air heater 20 (not shown), the controller 51 controls the operation of the air supply means 42 in accordance with the heating operation of the air heater 20. It was done.

Then, the vaporized surface is baked, and tar and dust adhering to the surface are cleaned, so that a stable vaporized state can be always maintained.

The components having the same reference numerals as in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described.
Because the combustion device is provided with a mode in which heated air having a temperature higher than the normal temperature is sent from the air heater 20 at regular intervals or at the beginning of use in the season, the vaporized surface 16 is attached to the surface in the state of being baked. Since tar and dust are cleaned, a stable vaporized state can be always maintained. Also, by blowing high-temperature air to the vaporizing surface 16, the burning of tar, dust, and the like can be accelerated. Further, the timing for performing the cleaning can be automatically performed at regular intervals according to an instruction from the storage unit 50, or can be manually performed by a user according to an instruction from the storage unit 50. Air heater 2
When an independent air supply means 42 is provided for 0,
Since the controller 51 controls the operation of the air supply unit 42 in accordance with the heating operation of the air heater 20, the best cleaning can be performed.

(Embodiment 7) FIG. 7 is an enlarged sectional view showing a main part of a combustion apparatus according to Embodiment 7 of the present invention.

This embodiment is different from the first embodiment (or 2 or 3 or 4 or 5 or 6) in that when the combustion is stopped, the independent air supply means 42 is operated together with the blower 37, and the air heating surface 16 is heated by air. That is, a controller 52 for giving an instruction to blow air for cooling through the heater 20 is provided.

The components having the same reference numerals as in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described.
The cooling air is supplied from the air supply means 42 to the vaporizing surface 16 according to the instruction of, so that the vaporizing surface 16 is rapidly cooled and its surroundings are cooled to lower the temperature.
2, the temperature of the fuel nozzle 12
Can be prevented, and the proper state can be maintained for a long time. Further, by rapidly cooling the vaporized surface 16, it is possible to prevent the fuel adhering to the surface from being tarred and keep the vaporized surface 16 always in an appropriate state.

[0058]

As described above, according to the combustion apparatus of the first aspect of the present invention, the fuel is vaporized by the heated air from the air heater at the time of starting, so that the vaporized gas is formed in a short time and the ignition is performed. It is not necessary to attach another heating means, for example, an electric heating element, to the vaporizer main body, and the power consumption can be reduced accordingly. In addition, there is no need to always preheat the vaporizer by short-time ignition, and there is an effect that standby power can be eliminated.

According to the second aspect of the present invention, since the air heater is provided with an independent air supply means separate from the blower, the air heating means can generate high-pressure air. This has the effect that the vessel can be made compact and can be easily inserted into the vaporizer.

According to the third aspect of the present invention, the temperature of the vaporized surface is constantly monitored by the vaporized surface temperature sensor, and if the temperature is lower than the predetermined temperature, the air heater is operated to heat the vaporized surface. There is an effect that stable vaporization can be maintained.

According to the fourth aspect of the present invention, in the case where it is assumed that the temperature of the blown air is lowered and the temperature of the vaporized surface becomes lower than a predetermined temperature due to a change in climate,
Since the air heater is operated to heat the vaporized surface, there is an effect that the fuel that cannot be completely vaporized on the vaporized surface is completely vaporized on the vaporized surface and stable vaporization can be maintained.

According to the combustion apparatus of the fifth aspect, even if the temperature of the vaporized surface rises, the heating output of the air heater is controlled and operated in accordance with the amount of combustion for a predetermined time. Until the entire vaporizer stabilizes at a uniform temperature, blow the heated air to completely vaporize the unburned fuel from each part of the vaporizer regardless of the fuel flow rate so that the unburned fuel does not blow out. Has the effect of being able to supply

According to the combustion apparatus of the sixth aspect, since the combustion apparatus is provided with a mode in which only the heated air is blown from the air heater to the vaporized surface, the vaporized surface is set in the state of being burnt. Thus, there is an effect that tar and dust adhering to the surface can be cleaned and a stable vaporized state can be always maintained.

Further, according to the combustion apparatus of the present invention, when the combustion is stopped, the independent air supply means is operated together with the blower, and the cooling air is blown to the vaporizing surface via the air heater. The surface and its surroundings are quenched and the temperature is rapidly lowered, and by lowering the temperature of the fuel nozzle, clogging of the fuel nozzle due to tar generation can be prevented, and the proper state can be maintained for a long time.

According to the combustion apparatus of the present invention, the amount of air required for vaporization suitable for the amount of fuel supplied is adjusted in accordance with the instruction from the controller, by combining the air from the air supply means and the air from the air supply means. Therefore, the best concentration of vaporized gas can be formed, and good combustion can be maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a combustion apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a combustion apparatus according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a combustion apparatus according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a combustion apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a combustion apparatus according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a combustion apparatus according to a sixth embodiment of the present invention.

FIG. 7 is a sectional view of a main part of a combustion apparatus according to a seventh embodiment of the present invention.

FIG. 8 is a sectional view of a main part of a conventional combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fuel pump 12 Fuel nozzle 13 Vaporizer 16 Vaporization surface 20 Air heater 22 Heating element

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Nobuhiko Fujiwara 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (Reference) 3K052 AA01 AA02 AA10 AB03 AB12 AB14 AC05 BA19 BA23 BA25 BA39 EB02 EB03 EB05 EB07 GA01 GA02 GA10 GB03 GC01 GE01 GE07

Claims (8)

[Claims] 1. A vaporizer for vaporizing a liquid fuel, a vaporizing surface formed by a part of the vaporizer, a fuel nozzle for supplying fuel to the vaporizing surface, both ends being open and the minus end being the vaporizing surface. And an air heater provided to face the heating element and holding the heating element. 2. The air supply means for blowing air to the air heater is provided independently of the combustion air blowing means.
A combustion device as described. 3. The apparatus according to claim 1, further comprising a vaporizing surface temperature detecting means for detecting a vaporizing surface temperature, and a controller for controlling a heating operation of the air heater based on a value detected by the vaporizing surface detecting means.
The combustion device according to any one of claims 1 to 4. 4. An air temperature detecting means for detecting an air temperature,
The combustion device according to any one of claims 1 to 3, further comprising a controller that controls a heating operation of the air heater based on a value detected by the blast temperature detection unit. 5. The combustion apparatus according to claim 1, further comprising a controller that controls a heating operation of the air heater in accordance with a combustion amount. 6. The combustion apparatus according to claim 1, wherein the air heater includes a control unit for controlling a heating operation for heating the air heater to a temperature higher than a predetermined temperature. 7. The air heater according to claim 2, further comprising a control unit that operates an independent air supply unit when the combustion is stopped to control the inflow of air to the vaporizing surface. Combustion equipment. 8. The combustion according to claim 2, further comprising a control unit for detecting a fuel supply amount and controlling an air flow rate of a combustion air blowing unit and an air supply unit for an air heater. apparatus.