JP2002122308A - Vaporizing combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vaporizing combustion apparatus wherein vaporized gas in combustion operation is prevented to the utmost from being condensed. SOLUTION: A pilot burner 4 and a main burner 3 are provided, and a pilot burner head 8 that includes therein a pilot side mixed gas passage 11 for guiding mixed air to a pilot flame hole 9 is accommodated in a main burner head 7 that includes therein a main side mixed gas passage 10 for guiding the mixed gas to a main flame hole 18. A mixed gas distribution section 12 is formed in the pilot burner head 8, and a vaporizer 6 is mounted on the burner top 9 above the mixed gas distribution section 12. A mixed gas passage 43 disposed in the vaporizer 6 is communicated with the mixed gas distribution section 12 through a mixed gas introduction hole 44.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporization type combustion device provided in a hot air heating device or the like.

[0002]

2. Description of the Related Art An evaporative combustion apparatus for evaporating and burning liquid fuel such as kerosene supplies a liquid fuel to a vaporizer heated by a heater (electric heater), vaporizes the liquid fuel, and converts the vaporized gas into air. The mixture is supplied to a burner and burned by the burner.

[0003] This type of combustion apparatus usually includes one or more burners having a relatively large combustion area. Then, at the start of the combustion operation, after the vaporizer is preheated by the heater, a liquid fuel is supplied to the vaporizer to generate a vaporized gas, and the vaporized gas is mixed with air. Supply to at least one of the burners. Further, the air-fuel mixture ejected from the burner opening of the burner is ignited by spark discharge of an ignition electrode or the like, and the burner starts burning. Incidentally, in the case of a plurality of burners, usually, after the start of the combustion operation of one burner, if necessary, the mixture is supplied to the other burners, and the fire is burned from the burning burner. The combustion operation of another burner is performed.

On the other hand, in the vaporization type combustion apparatus, in order to secure a desired combustion amount of the burner, all the vaporized gas obtained by vaporizing the liquid fuel supplied to the vaporizer by the vaporizer remains in a gaseous state. To be supplied to the burner flame.

However, in the conventional vaporization type combustion apparatus, since the combustion area of the burner for starting the combustion operation is relatively large, the amount of vaporized gas to be supplied to the burner when starting the combustion operation of the burner is also reduced. It will be relatively large. Therefore, particularly when the combustion operation of the burner is started in a state where the temperature of the burner is low, or at an initial stage of the combustion operation, a part of the vaporized gas supplied to the burner easily forms dew condensation. The vaporized gas has a disadvantage that it is not supplied to the burner of the burner and does not contribute to the combustion of the burner.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vaporization type combustion apparatus capable of minimizing condensation of vaporized gas during a combustion operation. .

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a vaporization type combustion apparatus according to the present invention has a main flame burner, and a main body which is ignited and burned after being ignited. A burner, a vaporizer that heats and vaporizes the liquid fuel to generate a vaporized gas of the liquid fuel, and a mixture of the vaporized gas and air generated by the vaporizer is supplied from the vaporizer side. A pilot-side air-fuel mixture passage for guiding the supplied air-fuel mixture to the flame of the pilot-fire burner; and the air-fuel mixture is supplied from the carburetor side, and the supplied air-fuel mixture is guided to the flame of the main burner. A main-side air-fuel mixture passage; and a valve device for blocking entry of the air-fuel mixture into the main-side air-fuel mixture passage in a non-combustion state of the main burner. The pilot-side mixture path is housed in the main-side mixture path.

In the vaporization type combustion apparatus according to the present invention, when performing the combustion operation, first, the mixture is supplied from the carburetor side to the pilot flame while the main side mixture passage is blocked by the valve device. The mixture is supplied to the side mixture passage, and further guided to the flame opening of the pilot flame burner through the pilot mixture passage to be ignited. In this case, since the combustion amount of the pilot flame burner may be relatively small, the amount of vaporized liquid fuel supplied to the pilot flame burner may be small, and the vaporized gas may be given a sufficient amount of heat by a vaporizer. Can be. For this reason, even if the vaporized gas releases a certain amount of heat in the course of flowing to the flame port of the pilot flame burner via the pilot flame side mixture passage, the vaporized gas hardly forms dew. Therefore, basically, the vaporized gas is led to the flame port of the pilot flame burner while maintaining the vaporized state and burns.

In the evaporative combustion apparatus according to the present invention, after the combustion operation of the pilot flame burner is started as described above, the main-side mixture passage is opened by the valve device.
The air-fuel mixture is supplied from the carburetor side to the main-side air-fuel mixture passage, and the air-fuel mixture is guided to the flame outlet of the main burner through the main-side air-fuel mixture passage. Further, the combustion flame of the pilot burner burns into the air-fuel mixture guided to the flame outlet of the main burner, and the combustion operation of the main burner starts.

At this time, the pilot-air-side mixture passage is heated by the combustion of the pilot-fire burner preceding the combustion of the main burner, and the main-side mixture passage having the pilot-side mixture passage therein. Are heated by the radiant heat from the seed-side mixture passage. For this reason, in the process in which the air-fuel mixture flows through the main air-fuel mixture passage, heat release of the vaporized gas in the air-fuel mixture is reduced. As a result, the vaporized gas in the air-fuel mixture supplied to the main air-fuel mixture passage flows through the main air-fuel mixture passage toward the flame opening of the main burner without dew condensation, and burns. In this case, the amount of the vaporized gas generated by the vaporizer is basically larger than when the pilot flame burner alone is used, and the amount of heat given by the vaporizer per unit amount of the vaporized gas is the pilot flame. Although it becomes less than when only the burner is burned, since the heat radiation of the vaporized gas in the process of the air-fuel mixture flowing through the main air-fuel mixture passage is reduced as described above, the vaporized gas must maintain a sufficient vaporized state. Can be.

As described above, according to the vaporization type combustion apparatus of the present invention, dew condensation of the vaporized gas during the combustion operation can be prevented as much as possible.

In the present invention, preferably, before the ignition of the pilot flame burner, there is provided a means for supplying air to the pilot-air-side mixture passage through the heated vaporizer.

According to this, the air warmed by the vaporizer flows through the pilot-air-side mixture passage before the pilot-fire burner ignites, and the pilot-air-side mixture passage is warmed via the air. At this time, since the pilot-side mixture path is disposed in the main-side mixture path, the heat retention is good. As a result, when igniting the pilot flame burner, when the air-fuel mixture is supplied to the pilot-fire side air-fuel mixture passage, heat radiation of the vaporized gas in the air-fuel mixture is reduced, thereby further preventing dew condensation of the vaporized gas. Can be.

Further, according to the present invention, there is provided a case-shaped main burner head which is accommodated in the main burner head with a space between the case-shaped main burner head which is opened upward and an inner surface of the main burner head and which is opened upward. A pilot flame burner head, a pilot flame burner top provided on the pilot flame burner head so as to close an upper end opening of the pilot flame burner head, and the main burner except above the pilot flame burner head A main burner top provided on the main burner head so as to close an upper end opening of the head; and a flame port of the pilot flame burner, which communicates with a space inside the pilot flame burner head to communicate with the pilot flame. A seed flame port drilled in the burner top,
The main burner includes a main burner port formed in the main burner top and communicating with a space inside the main burner head and outside the pilot flame burner head. The pilot-side mixture passage is formed by a space inside the pilot-burner head, and the main-side mixture passage is formed by a space inside the main burner head and outside the pilot-burner head. Have been.

As described above, the case is provided with the pilot flame burner head and the main burner head, the pilot flame burner top having the pilot flame opening, and the main burner top having the main flame opening. The space inside the pilot burner head forms the pilot mixture passage, and the space outside the pilot burner head inside the main burner head forms the main mixture passage. Therefore, it is possible to easily realize a structure in which the pilot-air-side mixture passage is accommodated in the main-side mixture passage.

In this case, it is preferable that the pilot flame burner top and the main burner top are formed integrally.

According to this, when the combustion of the pilot flame burner starts, the heat of the combustion flame rising from the pilot flame outlet of the pilot flame burner top easily and quickly transfers from the pilot flame burner top side to the main burner top side. I do. For this reason, after the start of the combustion operation of the pilot burner, the main burner top can be sufficiently heated by the time the combustion operation of the main burner is started. The dew condensation of the vaporized gas in the air-fuel mixture flowing through the main-side air-fuel mixture passage toward the main flame opening can be further prevented.

Further, in the vaporization type combustion apparatus of the present invention provided with a pilot flame burner head or the like as described above, preferably, the interior of the pilot flame burner head communicates with the pilot flame port. A space serving as the pilot-side mixture passage, and the mixture is introduced from a vaporizer side through a mixture introduction hole formed in the pilot-fire burner top, and the introduced mixer is moved to the pilot-side. A partition member is provided which is separated from a mixture passage and a space serving as a mixture distribution section for distributing the mixture to the main mixture passage, and the partition member connects the pilot-side mixture passage to the mixture distribution section. A pilot-side through-hole is drilled, and a main-side through-hole is formed in a wall of the pilot-fire burner head facing the air-fuel mixture distribution section, for communicating the main-side air-fuel mixture passage to the air-fuel mixture distribution section. And the valve device is configured to prevent the main burner from burning. A valve device for closing the main-side through holes in state.

According to this, the pilot flame side mixture passage and the mixture distribution section are formed in the pilot flame burner head accommodated in the main burner head via the partition member. The air-fuel mixture distribution section is accommodated and arranged in the main-side air-fuel mixture passage together with the pilot-air-side air-fuel mixture passage. For this reason, especially, after the start of the combustion of the pilot flame burner, the mixture distribution section is warmed and kept warm together with the pilot-air mixture path, and during the combustion of the main burner, the mixture distribution section is provided. It is possible to prevent condensation of the vaporized gas in the mixture supplied to the main-side mixture passage.

Further, as described above, when air is supplied to the pilot-fire-side mixture passage via a vaporizer before the pilot-fire burner is ignited, the air is supplied together with the pilot-fire-side mixture passage in the pilot-fire burner head. Since the air-fuel mixture distribution section is also heated via the air, the vaporized gas in the air-fuel mixture supplied to the pilot-air-side air-fuel mixture passage through the air-fuel mixture distribution section when the pilot flame burner is ignited. Condensation can be more effectively prevented.

In this case, the valve device closes the main-side through hole when the pilot burner is ignited (when the main burner is not burning), and when the main burner is ignited.
Both the pilot-side through-hole and the main-side through-hole will be opened.

As described above, in the vaporization type combustion apparatus of the present invention in which the pilot flame mixture path and the mixture distribution section are formed in the pilot flame burner head, more preferably, the vaporizer comprises:
Inside thereof, there is provided a mixture supply path for mixing a vaporized gas obtained by vaporizing the liquid fuel and air and supplying the mixture to the mixture distribution section, and the vaporizer includes the mixture supply path. The pilot burner top is mounted on the burner top above the pilot fire burner head so as to communicate with the mixture introduction hole.

According to this, the air-fuel mixture generated in the vaporizer is immediately introduced from the vaporizer to the air-fuel mixture distribution section in the pilot flame burner head through the air-fuel mixture introducing hole. For this reason, the vaporized gas in the air-fuel mixture is introduced into the air-fuel mixture distribution section in the pilot flame burner head while having sufficient heat. For this reason, the vaporized gas in the air-fuel mixture flows from the air-fuel mixture distribution section to the pilot flame port through the pilot-air mixture path, or to the main flame port through the main-air mixture path. Dew condensation of the vaporized gas can be further prevented.

In this case, it is preferable that the vaporizer has a heat receiving fin above the seed flame port.

According to this, after the start of combustion of the pilot flame burner, the vaporizer is heated via the heat receiving fins by the combustion flame of the pilot flame burner (heat is fed back). When the fuel is vaporized, a sufficient amount of heat can be given to the vaporized gas of the liquid fuel. For this reason, it is possible to further prevent dew condensation of the vaporized gas and suppress power supply to a heater (electric heater) of the vaporizer during combustion, thereby saving power.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a vaporization type combustion apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a mechanical configuration of the vaporization type combustion apparatus of the present embodiment, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. 3 is a block diagram showing a configuration of electronic equipment of the vaporization type combustion apparatus. It is.

Referring to FIG. 1, the vaporizing combustion apparatus of the present embodiment is provided, for example, in an FF type hot air heating apparatus, and includes a square box-shaped burner case 1 and kerosene as a liquid fuel. And a constant oil level device 2 that is stored. The burner case 1 and the constant oil level unit 2 are housed in an outer case (not shown) of the hot air heating device. In this case, the constant oil level unit 2 is connected to a fuel tank (not shown) by a pipe, and kerosene is supplied from the fuel tank.

In the following description, for the sake of convenience, the left-right direction in FIG.
Of the burner case 1 are the left side and the right side, respectively.

The burner case 1 houses a burner unit 5 constituting the main burner 3 and the pilot flame burner 4, and a vaporizer 6 mounted on the burner unit 5.

The main parts of the burner unit 5 are a main burner head 7, a pilot burner head 8 and a burner top 9.
It is composed of

The main burner head 7 constitutes the main burner 3 together with a burner top 9 which will be described in detail later, and has a box shape which opens upward and extends in the front-rear direction. In addition, the pilot fire burner head 8 is a burner top 9
In addition, the pilot flame burner 4 is configured, and has a box-like shape that has a shape substantially similar to the main burner head 7 and that opens upward.

The pilot burner head 8 is smaller in length and depth in the front-rear direction than the main burner head 7. The pilot flame burner head 8 is accommodated in the main burner head 7 such that the upper end surface thereof is flush with the upper end surface of the main burner head 7. In this case, as shown in FIG. 2, the pilot flame burner head 8 has flanges 8 a formed on both sides of the upper end thereof supported by flanges 7 a formed on both sides of the upper end of the main burner head 7.

Further, inside the main burner head 7,
As shown in FIG. 1, the pilot fire burner head 8 accommodated in this
A space 10 is formed at the front and rear portions and at the lower portion. The space 10 serves as a passage for supplying an air-fuel mixture (air-fuel mixture of kerosene gas and air) to be burned in the main burner 3 to a flame port 18 of the main burner 3 which will be described later. This space corresponds to a side air-fuel mixture passage (hereinafter, this space 10 is referred to as a main air-fuel mixture passage 10).

A partition plate (partition member) 13 for separating the inside of the pilot flame burner head 8 into a space 11 on the front side and a space 12 on the rear side is provided. The partition plate 13 is provided with a through hole (burring hole) 15 having a projection 14 projecting into the space 12.
The spaces 11 and 12 are communicated with each other via. A through hole (burring hole) having a convex portion 16 protruding into the space 12 is provided on a side wall of the rear end of the pilot flame burner head 8 facing the partition plate 13 (the right end of the pilot flame burner head 8 in FIG. 1). A hole 17 is formed concentrically with the through hole 15 of the partition plate 13, and the space 12 communicates with the main-side mixture passage 10 via the through hole 17.

Here, the front space 11 in the pilot flame burner head 8 serves as a passage for supplying an air-fuel mixture to be burned by the pilot flame burner 4 to a flame port 19 described later of the pilot flame burner 4. The space 11 corresponds to a pilot-fired air-fuel mixture passage in the present invention (hereinafter, this space 11 is referred to as a pilot-fired air-fuel mixture passage 11). The rear side space 12 in the pilot flame burner head 8 is also provided.
Is a portion for distributing and supplying the air-fuel mixture generated in the vaporizer 6 to be described later in detail to the main-side air-fuel mixture passage 10 and the pilot-air-side air-fuel mixture passage 11, and corresponds to an air-fuel mixture distribution section in the present invention. (Hereinafter, the space 12 is referred to as an air-fuel mixture distribution unit 12).

The burner top 9 has a plate shape.
The main burner head 7 and the pilot flame burner head 8 housed therein are mounted on the upper end surfaces of the main burner heads 7 and 8 so as to close the burner heads 7 and 8, and are attached to the flanges 7 a of the main burner head 7. The packing is fixed by screws (not shown) or the like.

The burner top 9 integrally forms the pilot-side burner top and the main-side burner top according to the present invention, and a portion of the burner top 9 located forward of the pilot-fire burner head 8 (this portion is A plurality of flame openings 18 communicating with the main-side mixture passage 10 in the main burner head 7 are formed in the main burner head 7). Further, the pilot mixture side gas passage 11 of the burner top 9
A plurality of flame openings 19 communicating with the pilot-side mixture passage 11 are formed in a portion at the upper part of the above (this portion corresponds to the pilot-side burner top). These flame outlets 18, 19
Are the main flame ports for the main burner 3 and the seed flame ports for the pilot flame burner 4, respectively, and the number and the range of the main flame ports 18 are larger than the number of the pilot flame ports 19 and the range thereof. It has been.

The left and right sides of the burner top 9 project to both sides of the main burner head 7 as shown in FIG. 2, and this portion is secondary to the combustion flame rising from the flame ports 18 and 19. A plurality of secondary air introduction holes 20 for supplying air are provided.

Burner unit 5 configured as described above
Is a burner mounting member 21 installed in the burner case 1.
And held in the burner case 1.

More specifically, the burner mounting member 21 includes a horizontal plate 22 disposed in the burner case 1 in a horizontal posture,
A vertical plate 2 erected in a vertical position from the rear end of the horizontal plate 22
3 is provided with a plate member 24 having an L-shaped vertical cross section, which is integrally formed with the plate member 3. The width of the plate 24 in the left-right direction (the direction perpendicular to the plane of FIG. 1) is the same as the width in the left-right direction inside the burner case 1 (see FIG. 2).
The vertical plate 23 is disposed inside the burner case 1 so as to surround the upper space 25 on the front side inside the burner case 1 and is fixed to the side wall and the top plate of the burner case 1 via screws (not shown). .

As shown in FIG. 2, the lower surface of the horizontal plate 22 of the plate member 24 is bent into an L-shaped cross section and extends in the front-rear direction (the direction perpendicular to the plane of FIG. 2). A pair of guide members 26, 26 are fixedly provided at a predetermined interval in the left-right direction.
Form a burner support 26a extending in the front-rear direction with a certain width of gap between each horizontal plate 22.

The burner unit 5 has guide members 26, 26 on both left and right sides of the burner top 9.
Is inserted into a gap between the burner bearings 26a, 26a and the horizontal plate 22, and is supported on the burner bearings 26a, 26a. Thus, the burner unit 5 is mounted on the burner mounting member 21 so as to be hung below the horizontal plate 22.

Referring to FIG. 1, a space 25 in the burner case 1 surrounded by the horizontal plate 22 and the vertical plate 23 of the plate member 24 has a combustion flame F3, rising from the flame ports 18, 19 of the burner unit 5. This is a space as a combustion chamber in which F4 is formed and combustion exhaust gas is generated (hereinafter, this space 25 is referred to as a combustion chamber 25). An opening hole 24a is provided in a region of the horizontal plate 22 of the plate member 24 facing the flame ports 18, 19 of the burner unit 5 and the secondary air introduction hole 20 to a lower portion of the vertical plate 23. The flame ports 18 and 19 of the burner unit 5 and the secondary air introduction hole 20 open toward the combustion chamber 25 through the hole 24a. Further, on the horizontal plate 2 of the plate member 24, the secondary air introduced into the combustion chamber 25 from the secondary air introduction holes 20 is supplied to the flame outlet 1.
A secondary air straightening plate 27 for guiding toward the combustion flames F3, F4 rising from 8, 19 is fixed.

A drain pipe 28 for discharging kerosene remaining in the main burner head 7 when the vaporized gas of kerosene is condensed is inserted into the lower end of the side wall at the rear end of the main burner head 7. Is being worn. This drain pipe 28
From the lower end of the side wall at the rear end of the main burner head 7
It extends obliquely downward toward the rear and protrudes rearward of the burner case 1 via a through hole 29 formed in a side wall at the rear end of the burner case 1. And this drain pipe 28
The rear end of the oil level basin 2 via a drain pipe 30
Is linked to

Further, a valve device 31 for adjusting the distribution ratio of the mixture introduced into the mixture burner head 8 to the main burner 3 and the pilot burner 4 is provided in the mixture burner distribution section 12 in the pilot fire burner head 8. Of the valve body 32 is accommodated.

The valve device 31 includes the valve body 32 formed in a disc shape, a rod 33 connected to the valve body 32,
An electric motor 34 (stepping motor) for moving the valve body 32 via the rod 33 is provided.

More specifically, the valve element 32 of the valve device 31
Are arranged concentrically with the through holes 15 and 17 in front and behind the mixture distribution section 12, and the rod 33 extends rearward from the center of the valve body 32. The rod 33 is connected to the through hole 17 of the pilot burner head 8 and the main burner head 7.
The main burner head projects through the rod insertion hole 35 formed in the rear end side wall of the burner case 1 and the rod through hole 36 formed in the rear end side wall of the burner case 1 to the rear of the burner case 1. 7 is slidably supported in the front-rear direction by the rod insertion hole 35.

The electric motor 34 of the valve device 31 is attached to the rear side wall of the burner case 1 outside the burner case 1 via a motor attachment member 37, and a rotary drive shaft 34a of the electric motor 34 is provided. The rear end of the rod 33 is connected via an elastic connecting member 38 such as a piano wire.

In the valve device 31, by rotating the rotary drive shaft 34 a of the electric motor 34, the valve element 31 arranged in the mixture distribution section 12 moves in the front-rear direction together with the rod 33. Thereby, the through hole 15 (hereinafter, referred to as the through hole 15)
The distance between the convex portion 14 of the pilot-side through hole 15 and the valve body 32 and the through hole 17 (hereinafter referred to as the main side through hole 17).
) Is adjusted between the convex portion 16 and the valve body 32.
In other words, the pilot hole side through hole 1 for the air-fuel mixture distribution unit 12
5 and the opening degree of the main-side through hole 17 are adjusted. In this case, when the valve element 32 is advanced, the opening degree of the pilot-side through hole 15 is reduced and at the same time, the main-side through hole 17 is opened.
When the valve element 32 is retracted, the opening of the pilot-side through-hole 15 increases, and at the same time, the opening of the main-side through-hole 17 decreases.

Incidentally, in the valve device 31 of this embodiment,
When the rotation drive shaft 34a of the electric motor 34 is rotated,
At the same time as the rod 33 moves in the front-rear direction, the rod 33 slightly swings up and down about the rod insertion hole 35 as a fulcrum. Therefore, the rod through hole 36 in the side wall at the rear end of the burner case 1
Is formed to have a larger diameter than the outer diameter of the rod 33. In order to ensure airtightness in the burner case 1 in the rod through hole 36, a seal member 39 for closing the rod through hole 36 is provided on the outer peripheral portion of the rod 33.
And a guide member 40 which is slidably mounted in the axial direction and guides the seal member 39 so as to be vertically movable.
Is fixed to the side wall at the rear end of the burner case 1.

The vaporizer 6 is mounted on the burner top 9 at a position above the mixture distribution section 12 in the pilot flame burner head 8 and is fixed to the burner top 9 with screws (not shown) or the like.

The vaporizer 6 is composed of a main body 41 mainly comprising a front portion thereof and an exterior cover member 42 mounted on the rear surface of the main body 41. The outer cover member 42 forms a space 43 that opens downward in the vaporizer 6. The space 43 serves as a flow passage for generating a mixture of the vaporized gas of kerosene and air and guiding the mixture to the mixture distribution section 12 in the pilot flame burner head 8. It is equivalent to a supply channel (hereinafter,
The space 43 is referred to as a main mixture passage 43). The main mixture passage 43 has a through hole (mixture introduction hole) formed in the burner top 9 above the mixture distribution unit 12.
The air-fuel mixture distribution unit 12 is communicated with the air-fuel mixture distribution unit 12 through 44.

The main body 41 of the vaporizer 6 includes an electric heater 45.
Is built in, and is heated by energizing the electric heater 45. And this main body 41
A temperature sensor 46 for detecting the temperature of the main body 41 is attached to a rear end of the upper part of the main body 41. Further, a heat receiving fin 47 protrudes from the front surface of the main body 41, and the heat receiving fin 47 is located immediately above the seed flame port 19.

An air inlet 48 is formed at the upper part of the outer cover member 42 forming the rear end of the vaporizer 6 and opens toward the main mixture passage 43. Nozzle 49 is inserted.

The combustion injection nozzle 49 has a base 50.
Is attached to the rear end side wall of the burner case 1, and extends from the base 50 through the air inlet 48 to the main mixture passage 43. The fuel injection nozzle 49 is connected via a base 51 to a fuel supply pipe 52 derived from an electromagnetic pump 51 mounted on the constant oil level unit 2. The kerosene supplied from the vessel 2 is jetted into the main mixture passage 43 toward the inner wall of the main body 41 of the vaporizer 6.

Further, a combustion fan 53 is mounted outside the burner case 1 below the side wall at the front end of the burner case 1. The combustion fan 53 blows air for combustion of the main burner 3 and the pilot flame burner 4 by operating a fan motor 53a provided in the combustion fan 53, and is formed at a lower portion of a front end side wall of the burner case 1. Air inlet hole 5
The combustion air is supplied to the burner case 1 via the burner case 4.

In this case, in the burner case 1, the space 55 around the main burner head 7 (including the space below and behind the main burner head 7) is supplied to the air inlet 48 of the carburetor 6 with kerosene. It is an air passage that supplies combustion air (primary air) mixed with vaporized gas.
The combustion air supplied from the combustion fan 53 into the burner case 1 is guided to the air inlet 48 of the carburetor 6 through the air passage 55, and further, the main air inside the carburetor 6 is supplied from the air inlet 48. The mixture is led to the mixture passage 43.

A part of the air supplied from the combustion fan 53 into the burner case 1 is supplied as secondary air to the combustion chamber 25 through the secondary air introduction hole 20 of the burner top 9.

The top plate at the upper end of the burner case 1
An exhaust gas outlet 56 is formed for discharging exhaust gas generated by the combustion of the air-fuel mixture at the flame ports 18 and 19 of the burner top 9 from the combustion chamber 25. The exhaust gas outlet 56 is provided with a radiator (heat exchanger) (not shown) of the hot air heating device in the present embodiment.

The hot-air heating device provided with the vaporizing combustion device of the present embodiment having the above-described configuration is of the FF type, and the radiator has an exhaust pipe (not shown) for guiding the combustion exhaust gas to the outside. The combustion fan 46 is connected to an air supply pipe (not shown) that guides combustion air from outside. Although not shown in FIG. 1, an ignition electrode for generating a spark discharge for igniting the pilot flame burner 4, the pilot flame burner 4 and the main burner 3 are provided in the burner case 1.
A flame detector such as a frame rod for detecting the combustion flames F4 and F3 is provided. Further, in the outer case of the warm air heating device, the indoor air is convected through the radiator to circulate the warm air into the room. (The ignition electrode, the flame detector, the convection fan, and the like are conceptually illustrated in the block diagram of FIG. 3 in the present specification.).

Referring to FIG. 3, the hot air heating apparatus according to the present embodiment includes an electric motor 34 of the valve device 31, an electromagnetic pump 51, and a fan motor of a combustion fan 53, in addition to the above-described vaporized combustion device. 53a, a control device 57 for controlling the operation of the electric heater 45 of the vaporizer 6 and the like.

The control device 57 is constituted by an electronic circuit including a microcomputer or the like, and controls the temperature sensor 46 of the vaporizer 6 (hereinafter referred to as the vaporizer temperature sensor 4).
6), a flame detector 58, a sensor such as a room temperature sensor 59 for detecting the room temperature of the room in which the hot air heating device is installed, and the electric motor 34 of the valve device 31, the electromagnetic pump 51, and the combustion fan. Actuators such as a fan motor 53 a of 53, an electric heater 45 of the vaporizer 6, an igniter 61 for generating a spark discharge at the ignition electrode 60, and a fan motor 62 a of the convection fan 62 are connected.

The control device 57 controls the operation of each of the above-described actuators based on a detection signal of a sensor such as the vaporizer temperature sensor 46 or a predetermined program.

Next, the operation of the hot air heating device provided with the vaporizing combustion device of this embodiment will be described.

In the hot air heating apparatus of this embodiment, when an operation switch (not shown) is turned on, the control device 57 is turned on.
First, the electric motor 34 of the valve device 31 is controlled so that the valve 32 in the mixture distribution unit 12 is
Toward the main-side through-hole 17.
To sit on. As a result, the main-side mixture passage 10 is shut off from the mixture distribution unit 12, and the mixture mixture unit 12 is connected to the pilot-side mixture passage 11 through the pilot-side through hole 15.
Open to only.

Further, the control device 57 energizes the electric heater 38 to start heating the main body 41 of the vaporizer 6. Then, the vaporizer 6 by the vaporizer temperature sensor 46 is used.
When the detected temperature of the main body 41 rises to a first predetermined temperature T1 (for example, 130 ° C.), the control device 57 controls the fan motor 53a of the combustion fan 53 to rotate the combustion fan 53 at a predetermined speed. Rotate by number. At this time, the air blown from the combustion fan 53 is supplied to the air passage 55 in the burner case 1 and the main mixture passage 4.
3. The mixture flows into the combustion chamber 25 through the mixture distribution section 12, the seed-side mixture path 11, and the seed flame port 19, whereby the combustion chamber 25 and the like are scavenged.

At this time, the air flowing through the main mixture passage 43 in the carburetor 6 is heated by receiving the heat of the main body 41 of the carburetor 6 heated by the electric heater 38. Then, the warmed air flows through the air-fuel mixture distribution section 12 and the pilot-air-side air-fuel mixture passage 11, so that the pilot-fire burner head 8 having the air-fuel mixture distribution section 12 and the pilot-air-side air-fuel mixture passage 11 therein. Is also warmed. In this case, the air warmed in the main air-fuel mixture passage 43 inside the carburetor 6 immediately flows into the air-fuel mixture distribution section 12 and the pilot-air-side air-fuel mixture passage 11 in the pilot flame burner head 9. 6 is easily transmitted to the pilot flame burner head 8 via the burner top 9. In addition, pilot fire burner head 8
Is surrounded by the main burner head 7, so that the heat given to the pilot flame burner head 8 hardly escapes to the outside and has high heat retention. For this reason, the pilot flame burner head 8 is smoothly warmed and kept warm together with the mixture distribution section 12 and the pilot mixture path 11 therein.

Next, the temperature detected by the carburetor temperature sensor 46 at the main body portion 41 of the carburetor 6 is changed to the main mixture passage 43.
The second predetermined temperature T2 (>T1; for example, 1) at which kerosene can be vaporized.
When the temperature rises to 60 ° C.), the control device 57 executes an ignition process for the pilot flame burner 4.

In the ignition processing of the pilot flame burner 4, the control device 57 operates the igniter 61 to generate spark discharge at the ignition electrode 60 while the operation of the combustion fan 53 is continued. Further, the control device 57 controls the electromagnetic pump 51 to control the amount of kerosene discharged from the constant oil level unit 2 (= the amount of kerosene supplied to the fuel injection nozzle 49) by the electromagnetic pump 51 to a predetermined amount, The predetermined amount of kerosene is supplied to the fuel injection nozzle 49. At the beginning of the start of the heating of the vaporizer 6, the vaporizer temperature sensor 4 of the main body 41 of the vaporizer 6 is used.
In general, the temperature of the portion to which 6 is attached is lower than the temperature of a portion where kerosene is injected from the fuel injection nozzle 49 (hereinafter, referred to as a kerosene injection portion) due to a delay in heat transfer of the main body portion 41. Therefore, when the temperature detected by the vaporizer temperature sensor 46 reaches the second predetermined temperature T2 (160 ° C.), the temperature of the kerosene injection portion of the main body 41 of the vaporizer 6 is lower than the second predetermined temperature T2. High (eg 200
° C).

At this time, the kerosene supplied to the fuel injection nozzle 49 is injected from the fuel injection nozzle 49 toward the main body 41 of the carburetor 6 in the main mixture passage 43 in the carburetor 6, It is vaporized by the heat of 41. Further, at this time, the vaporized gas is mixed with air (primary air) introduced into the main air-fuel mixture passage 43 from the air inlet 48 of the carburetor 6 to form an air-fuel mixture. From the passage 43, the fuel is blown into the combustion chamber 25 through the mixture distribution section 12, the through hole 15, the pilot-side mixture passage 11, and the pilot flame port 19 in the pilot-fire burner head 8. Then, the jetted air-fuel mixture is ignited by spark discharge of the ignition electrode 60, and combustion of the pilot flame burner 4 starts.

In this case, the pilot flame burner head 9, the mixture distribution section 12 and the pilot mixture path 11 therein are heated and kept warm as described above. In addition, vaporizer 6
The amount of kerosene to be supplied and vaporized is sufficient for the combustion of the pilot flame burner 4 alone, so that a relatively small amount is sufficient. Therefore, the kerosene vaporized gas generated in the main mixture passage 43 of the vaporizer 6 can absorb a sufficient amount of heat from the main body 41 of the vaporizer 6 and flows from the vaporizer 6 to the seed flame port 19. Less heat is lost in the process. Therefore, the vaporizer 6
Is basically supplied to the seed flame port 19 and burned without dew condensation in the process of flowing from the vaporizer 6 to the seed flame port 19. Further, after the start of the combustion of the pilot flame burner 4, the combustion heat of the pilot flame burner head 8 is heated and kept warm, so that the dew condensation of the vaporized gas in the pilot flame burner head 8 can be more reliably prevented. it can. Further, after the start of the combustion of the pilot flame burner 4, the combustion flame F 4 rising from the pilot flame port 19 causes the main body 4 of the vaporizer 6 to operate.
Since 1 is heated via the heat receiving fins 47, the temperature of the main body portion 41 also increases, thereby giving sufficient heat of vaporization to the kerosene injected from the fuel injection nozzle 49 to vaporize the kerosene.

In this way, the combustion of the pilot flame burner 4 is started, and after the flame F4 of the pilot flame burner 4 is detected by the flame detector 58, the main body 41 of the vaporizer 6 is detected by the vaporizer temperature sensor 46. When the detected temperature rises to a third predetermined temperature T3 (for example, 220 ° C.) higher than the second predetermined temperature T2, the control device 57 starts the combustion of the main burner 3 together with the combustion of the pilot flame burner 4. In addition to controlling the discharge amount of the electromagnetic pump 51 so as to supply a predetermined amount of kerosene to the fuel injection nozzle 49, air of an amount corresponding to the supply amount of this kerosene is supplied to the main burner 3 and the pilot flame burner 4. The rotation speed of the combustion fan 53 is controlled to a predetermined rotation speed so as to be supplied. At the same time, the control device 5
7 controls the electric motor 34 of the valve device 31 so that the valve body 3
2 is moved to a predetermined position between the pilot-side through-hole 15 and the main-side through-hole 17, and the air-fuel mixture distribution unit 12 is connected to both the main-side air-fuel mixture passage 10 and the pilot-air-side air-fuel mixture passage 11. Open.

At this time, the moving position of the valve element 32 (the above-mentioned predetermined position) is a position near the pilot hole 15.

As a result, a mixture of the vaporized gas of kerosene and air (primary air) is generated in the main mixture passage 43 in the carburetor 6 and a part of the mixture is distributed to the mixture distribution unit 1.
2 is supplied to the pilot flame port 19 through the pilot-air-side mixture passage 11, the combustion of the pilot flame burner 4 continues, and the remainder of the mixture generated by the carburetor 6 is transferred from the mixture distribution unit 12 to the main part. The gas is supplied to the main flame port 18 through the side air-fuel mixture passage 10 and is ejected from the flame port 18. Then, the combustion flame F4 of the pilot flame burner 4 is ignited to the air-fuel mixture ejected from the main flame port 18, the main burner 3 is ignited, and the burner unit 5 including the main burner 3 and the pilot flame burner 4 is combined. The whole combustion operation starts.

In this case, the pilot flame burner head 8 in the main burner head 7 is heated and kept warm as described above.
For this reason, the main flame outlet 1 passes through the main-side air-fuel mixture passage 10 that contacts the pilot flame burner head 8 from the air-fuel mixture distribution unit 12.
The vaporized gas in the air-fuel mixture flowing to 8 reaches the main flame port 18 without much heat radiation. Further, since the burner top 9 having the main flame port 18 is integrally provided with the pilot flame port 19, each part of the burner top 9 (the peripheral portion of the main flame port 18) is heated by the combustion heat of the pilot flame burner 4. Are heated smoothly. As a result, the vaporized gas supplied to the main flame port 18 of the main burner 3 hardly causes dew condensation in the process of reaching the main flame port 18, and reaches the main flame port 18 while maintaining the vaporized state. Burn.

The vaporizer 6 based on the vaporizer temperature sensor 46
The detected temperature of the main body 41 is the third predetermined temperature T3 (22
After the temperature rises to 0 ° C. or higher, the control device 57 sets the temperature of the main body 41 of the vaporizer 6 to a substantially constant temperature (for example, 220
(Temperature in the range of 240 ° C. to 240 ° C.) so that the electric heater 45 is energized according to the temperature detected by the vaporizer temperature sensor 46.
Turn ON / OFF.

After the combustion of the main burner 3 is started as described above, the control device 57 operates the convection fan 62 to blow warm air and convection of room air while detecting the temperature by the room temperature sensor 59. The number of revolutions of the combustion fan 53, the amount of kerosene discharged from the electromagnetic pump 51, and the number of revolutions of the convection fan 62 are controlled in accordance with the set room temperature and a target room temperature set in advance by the user, and the room temperature is substantially maintained at the target room temperature. The temperature control operation of the hot air heating device is performed so as to perform the operation. in this case,
Basically, as the room temperature detected by the room temperature sensor 59 is lower than the target room temperature, the rotational speed of the combustion fan 53 and the electromagnetic pump 5
By increasing the amount of kerosene discharged to increase the amount of combustion of the burner unit 5, the rotational speed of the convection fan 62 is increased, and the amount of hot air blown is increased. When the room temperature detected by the room temperature sensor 59 approaches the target room temperature, the rotation speed of the combustion fan 53 and the discharge amount of the electromagnetic pump 51 are reduced,
The amount of combustion of the burner unit 5 is reduced, and the number of revolutions of the convection fan 62 is reduced to reduce the amount of hot air blown.

In this temperature control operation, the dew condensation of the vaporized gas in the pilot flame burner head 8 and the main burner head 7 is prevented as in the case described above.

As described above, according to the apparatus of this embodiment, it is possible to effectively prevent a situation in which the vaporized gas forms dew before reaching the main flame port 18 and the seed flame port 19. As a result, the main burner 3 and the pilot burner 4
Can be surely secured to a desired combustion amount, and a good combustion state of the burners 3 and 4 can be secured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a mechanical configuration of an embodiment of a vaporization type combustion apparatus according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a block diagram showing a configuration of an electronic device of the vaporization type combustion apparatus of FIG.

[Explanation of symbols]

3 ... main burner, 4 ... pilot burner, 6 ... vaporizer, 7 ...
Main burner head, 8 pilot burner head, 9 burner top, 10 main mixture passage, 11 pilot mixture passage, 12 mixture distribution section, 13 partition plate (partition member), 15 ... Seed-side through hole, 17 ... Main-side through hole, 18 ... Main flame port, 19 ... Seed flame port, 31 ... Valve device, 44 ... Mixture introduction hole.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Eiji Honda, 3333 Imagifuku, Kawagoe-shi, Saitama Prefecture In-house 2833 Sunpot Co., Ltd. 3K052 AA10 AB06 DA09 DB01 DB08 EA08 EB07 EB09

Claims (7)

[Claims] 1. A pilot burner, and a main burner which is burned after being ignited from the pilot burner after ignition of the pilot fire burner.
A vaporizer that heats and vaporizes the liquid fuel to generate a vaporized gas of the liquid fuel; and a mixture of the vaporized gas and air generated by the vaporizer is supplied from the vaporizer side and supplied. A pilot-side air-fuel mixture passage that guides the air-fuel mixture to a flame port of the pilot-fire burner; and a main-side mixer that supplies the air-fuel mixture from the carburetor side and guides the supplied air-fuel mixture to the flame port of the main burner. An air passage, and a valve device for shutting off the inflow of the air-fuel mixture into the main-side air-fuel mixture passage in a non-combustion state of the main burner. The pilot-side air-fuel mixture passage is housed in the main-air-air mixture passage. An evaporative combustion device characterized by being arranged. 2. A vaporizer according to claim 1, further comprising means for supplying air to said pilot-side air-fuel mixture passage via said heated vaporizer before said pilot-fire burner is ignited. Combustion device. 3. A case-shaped pilot burner which is housed in the main burner head with a space between an upper open case-shaped main burner head and an inner surface of the main burner head, and is open upward. A head, a pilot flame burner top provided on the pilot flame burner head so as to close an upper end opening of the pilot flame burner head, and an upper end opening of the main burner head except above the pilot flame burner head And a main burner top provided on the main burner head so as to close the lid, and as a flame opening of the pilot flame burner, the main pilot burner head is pierced by communicating with a space inside the pilot flame burner head. A pilot flame port provided therein, and a flame port of the main burner, which is bored in the main burner top in communication with a space outside the pilot fire burner head inside the main burner head. A main flame port, the pilot-side mixture path is formed by a space inside the pilot-fire burner head, and the main-side mixture path is formed by the pilot-fire burner head inside the main burner head. 3. The evaporative combustion apparatus according to claim 1, wherein the evaporative combustion apparatus is formed by an outer space. 4. The evaporative combustion apparatus according to claim 2, wherein the pilot flame burner top and the main burner top are formed integrally. 5. The pilot flame burner head has a space communicating with the pilot flame opening and serving as the pilot flame side air-fuel mixture passage. A partition member that is introduced through a mixture introduction hole formed in the burner top, and separates the introduced mixer from a space serving as a mixture distribution unit that distributes the mixture into the pilot mixture mixture passage and the main mixture mixture passage. The partition member is provided with a pilot-side through-hole that communicates the pilot-side mixture passage with the mixture-distribution unit, and a wall of the pilot-fire burner head facing the mixture-distribution unit. A main-side through-hole for communicating the main-side mixture passage with the mixture-distribution section is provided in the portion, and the valve device closes the main-side through-hole in a non-combustion state of the main burner. The valve device according to claim 3 or 4, wherein the valve device is a valve device. Of combustion equipment. 6. The vaporizer has a mixture supply passage therein for mixing a vaporized gas obtained by vaporizing the liquid fuel with air and supplying the mixture to the mixture distribution section. 6. The vaporizer according to claim 5, wherein the air-fuel supply passage is connected to the air-fuel mixture introduction hole of the pilot-fire burner top, and is mounted on the burner top above the pilot-fire burner head. Combustion device. 7. The vaporization type combustion apparatus according to claim 6, wherein the vaporizer has a heat receiving fin above the seed flame port.