JP2921149B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional combustion apparatus will be described below. As shown in FIG. 4, a heater 1 is built in the vaporizing cylinder 2, a heat receiving part 5 is provided at an upper end, and a primary air pipe 3 having an oil feed nozzle 4 disposed inside is provided at a side part. A flame hole 6 and a burner cap 7 are provided on the upper part of the vaporizing cylinder 2.

[0003] The operation of the combustion apparatus configured as described above will be described below. The heater 1 is energized and the vaporizing cylinder 2
When the temperature rises to a predetermined temperature, the combustion fan and the fuel supply pump (both not shown) are operated to supply the primary air from the primary air pipe 3 and the liquid fuel from the oil supply nozzle 4 to the inside of the vaporization cylinder 2. Is done. The supplied fuel is a heated vaporization cylinder 2
The gas is vaporized on the inner wall, becomes a vaporized gas, is mixed with the primary air, is ejected from the flame hole 6, and is ignited by an igniter (not shown) to start combustion.

Thereafter, the heat receiving portion 5 is heated by the flame 8 of the combustion, and the heat is transmitted to the vaporizing cylinder 2. The heat source for vaporizing the liquid fuel is entirely by the heater 1 until the start of combustion, but after the start of combustion, the heat receiving portion 5 is heated by the flame 8 and most of the heat source is obtained by the combustion heat and continues the combustion with small electric power. be able to. Further, the combustion is promoted by supplying the flame 8 with secondary air from the outer periphery of the vaporizing cylinder 2.

[0005]

However, in the above-described conventional configuration, since the secondary air is supplied only from the outer peripheral direction to the flame formed in the flame hole, diffusion mixing of the flame and the secondary air is poor. There is a problem that the flame length becomes long and it is difficult to make the combustion device compact.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. A combustion apparatus in which secondary air for promoting combustion is uniformly supplied to completely burn with a uniform flame having a reduced flame length and the apparatus is made compact. The purpose is to provide.

[0007]

SUMMARY OF THE INVENTION To achieve this object, a combustion apparatus according to the present invention produces a premixed gas of fuel and air.
A carburetor, and a carburetor located below the carburetor.
Pre-mixed gas from the vaporizer
A mixing chamber in which water is supplied downward, and an upper part of the mixing chamber.
A plurality of radiating flame holes and a plurality of holes provided to divide the flame holes;
A plurality of secondary air ejection passages, and the secondary air ejection passages
The configuration is such that the flame holes are alternately arranged.

[0008]

With this configuration, the secondary air is supplied from both sides of the flame formed in the flame hole at the time of combustion to promote the combustion reaction, and the secondary air is uniformly supplied.

[0009]

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

As shown in FIGS. 1 to 3, an opening 11 for communicating with a flame hole 10 is provided at an upper portion of a mixing chamber 9 having a bottomed box shape.
And an air-fuel mixture inlet 12. A heater 17 is embedded in a vaporizer 13 provided above the mixing chamber 9. A mixture outlet 14 provided below the vaporizer 13.
Communicates with the mixture inlet 12. Heat receiving portion 15 provided by projecting a part of the side wall of vaporizer 13 above flame hole portion 10
A vaporizing surface 16 is provided inside the inside. Reference numeral 18 denotes a primary air inlet provided on the wall of the vaporizer 13, and reference numeral 19 denotes an oil feed nozzle inserted inside the primary air inlet, which is provided toward the vaporizing surface 16. Flame hole 1 made of a porous plate
Numeral 0 is divided by a plurality of secondary air ejection passages 20, and the flame holes 10 and the secondary air ejection passages 20 are arranged with their side surfaces joined so that their upper surfaces are formed on the same plane. . A plurality of secondary air ejection holes 21 are provided on an upper end surface of the secondary air ejection passage 20, and a rectifying weir 24 is provided on a lower end surface. A closing portion 23 is connected to an end of the secondary air ejection passage 20 on the side of the carburetor 13 in the longitudinal direction, and a secondary air passage 22 is connected to the other end.

The operation of the combustion apparatus configured as described above will be described below. When the heater 17 is energized and the vaporizing surface 16 rises to a predetermined temperature, the combustion fan and the fuel supply pump (both not shown) are operated to operate the primary air inlet 1.
The primary air from 8 and the liquid fuel from the oil supply nozzle 19 are supplied into the vaporizer 13. The supplied liquid fuel is supplied to the heater 1
The fuel gas comes into contact with the vaporized surface 16 heated by the gas 7 and becomes gaseous fuel. The fuel gas mixes with the primary air to form a pre-mixed gas, which is ejected from the air-fuel mixture outlet 14 through the air-fuel mixture inlet 12 and the opening 11 through the flame hole 10 and ignited by an igniter (not shown). A flame 25 is formed in the hole 10 and burns. The secondary air passes through a secondary air passage 22 from a combustion fan (not shown) via a secondary air passage 22 and a secondary air ejection hole 21.
And is supplied to the jet flame 25. During combustion, heat receiving part 15
Is heated by the flame 25 and heat is conducted to the vaporizing surface 16. The heat source for vaporizing the liquid fuel is all heated by the heater 17 until the combustion starts, but after the combustion starts, the heat receiving surface 15 is heated by the flame 25, and most of the heat source is obtained by the combustion heat and continues with a small amount of power. Can be done.

As described above, according to the present embodiment, the flame hole 1
0 is divided by the secondary air ejection passage 20 and the flame holes 10 and 2
Since the secondary air ejection passages 20 are alternately arranged, secondary air is supplied from both sides of the flame 25 formed in the flame hole portion 10, and the combustion reaction is promoted, and complete combustion occurs to generate carbon monoxide and soot. , The exhaust gas performance is improved, and the flame length is shortened, so that the combustion device can be made compact.

When the flame holes 10 and the secondary air ejection passages 20 are alternately arranged, the secondary air is supplied to the secondary air ejection passages 20.
Since the supply path of the secondary air becomes complicated when the secondary air is supplied from both ends, a closing portion 23 is provided at the end of the secondary air ejection passage 20 on the carburetor 13 side, and the secondary air is supplied from the other end. By simplifying the supply path of the secondary air, the amount of the secondary air ejected from the secondary air ejection hole 21 is small in a portion near the inlet of the secondary air, large in a portion far from the secondary air, and uneven in the longitudinal direction. Become. Therefore, there is a method of increasing the cross-sectional area of the secondary air ejection passage 20 as a measure for equalizing the amount of secondary air ejection. However, this measure has a disadvantage that the entire combustor becomes large. By providing a rectifying weir 24 serving as an air resistance inside the
The amount of air ejected from the secondary air ejection hole 21 in the portion near the secondary air inlet of the secondary air ejection passage 20 is increased, and the secondary air can be supplied uniformly, so that the secondary air is uniformly supplied to the flame 25. The supplied and uniform combustion can be obtained. Further, the flame hole 10 and the carburetor 13 are connected to each other at the upper part of the mixing chamber 9, and the closing portion 23 is provided on the side of the carburetor 13 so that the closing portion 23 can be constituted by the side wall of the carburetor 13. And a simple structure can be obtained.

[0014]

As is apparent from the above description of the embodiment, the present invention provides a carburetor for producing a premixed gas of fuel and air.
And a substantially orthogonal direction of the vaporizer located on the lower side of the vaporizer.
Premixed gas is directed downward from the vaporizer
A mixing chamber to be supplied, and a flame hole provided at an upper portion of the mixing chamber
And a plurality of secondary cavities provided so as to divide the flame hole portion.
An air ejection passage, wherein the secondary air ejection passage and the flame hole are provided.
Because it is arranged alternately, the secondary air is
Can be supplied from both sides, complete with uniform flame with reduced flame length
A combustion state can be obtained. In addition, the secondary air ejection passage
A secondary air passage is provided at one end of the cylindrical shape,
End is closed by a closed part, and inside the secondary air ejection passage
The one with a rectifying weir can supply secondary air uniformly,
A uniform flame having a short flame length can be formed. Sa
Furthermore, one end of the two air ejection passage was closed by contacting the vaporizer.
The structure can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view of a main part of a conventional combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Flame hole part 13 Vaporizer 21 Secondary air ejection hole 22 Secondary air passage

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) F23D 11/02 F23D 11/10 F23D 11/40 F23D 11/44 F23D 14/02

Claims (3)

(57) [Claims] 1. A vaporizer for producing a premixed gas of fuel and air .
And a substantially orthogonal direction of the vaporizer located on the lower side of the vaporizer.
Premixed gas is directed downward from the vaporizer
A mixing chamber to be supplied, a flame hole provided in an upper part of the mixing chamber , and a plurality of secondary air ejection passages provided so as to divide the flame hole. A combustion device in which holes and holes are alternately arranged. 2. The secondary air ejection passage is formed in a cylindrical shape, and one end thereof is provided with a secondary air passage, the other end is closed by a closing portion, and a rectifying weir is provided inside the secondary air ejection passage. The combustion device according to claim 1 provided. 3. The other end of the secondary air ejection passage is closed by a carburetor.
The combustion device according to claim 2 .