JPH03158609A - combustion device - Google Patents

Abstract

PURPOSE:To promote the mixing of vaporized fuel and combustion air and prevent the lift in the combustion flame and yellow flame by providing in a mixing chamber a mixing promotion board which is positioned at the mixture gas entrance of the mixing chamber and above the mixture gas outlet of a vaporizing cylinder. CONSTITUTION:A mixture gas inlet 36 is provided at the position opposite to the mixture gas outlet 20 of a carburetor 18 at the lower section of a mixing chamber 35 that is apart from the carburetor 18 through a carrier air channel 34, and in the mixing chamber 35 a plate shaped mixing promotion board 37 is provided so as to oppose the mixing gas inlet 36 and the mixture gas outlet 20 above the mixture gas inlet 36. The carrier air flows into the mixture gas inlet 36 of the mixing chamber 35 from the carrier air channel 34 together with the vaporization gas that is carried out from the mixture gas outlet 20 of the carburetor 18 and the carrier air and the vaporization gas collide with the mixing promotion board 37 simultaneously. With this arrangement the mixing is promoted and it is possible to prevent the lift of flame and the generation of yellow flame. And, since the straightforward ascending of the vaporization gas and the carrier air are obstructed by the mixing promotion board 37, it is possible to distribute the combustion flame 42 uniformly and to make the flame short.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a combustion device used in household water heaters, space heaters, and the like.

BACKGROUND OF THE INVENTION Conventionally, this type of combustion apparatus has had a structure as shown in FIG.

That is, l is the heater, 2 is the vaporizer cylinder, 3 is the vaporizer cylinder lid, 4
is a flame hole plate, 5 is a flame hole net, 6 is a flame hole middle flap, 7 is a rotor, 8 is a swinging plate, 9 is a mixing blade, 10 is a fuel supply pipe, 11 is a heat insulator, 12 is a combustion fan, 13 is a motor;
14 is a fuel supply pump, 15 is an oil receiving tank, and 16 is a vaporization surface.

When the heater 1 is energized and the temperature of the vaporizer tube 2 rises to a predetermined temperature, the motor 13 is driven and the rotor 7, swing plate 8, mixing blade 9, and combustion fan 12 rotate.

On the other hand, fuel is supplied to the oil receiving tank 1 by the fuel supply pump 14.
5 and is pumped to the rotor 7 via the fuel supply pipe lO.
Due to the centrifugal force of the rotor 7 and the swinging plate 8, which rotate while being supplied to the top, the water is uniformly scattered from the outer circumference of the swinging plate 8 and is atomized. The atomized fuel is vaporized on the vaporization surface 16 of the inner wall of the heated vaporization cylinder 2, and mixed with combustion air supplied by the combustion fan 12.
It becomes a mixture.

The air-fuel mixture is mixed more uniformly by the rotating mixing blades 19, and is ejected from the flame hole net 5 through the vaporizing tube cover 3 and flame hole plate 4, and is ignited by an igniter (not shown) to be combusted.

After that, the heat of the combustion flame 17 is received by the outer peripheral upper end of the vaporizer cylinder 2 and the upper surface of the vaporizer cylinder lid, and is transmitted to the vaporizer surface 16 to promote vaporization, so that the power supply to the heater is stopped.

Problems to be Solved by the Invention However, with such a structure, since combustion air is introduced into the carburetor cylinder 2, the tP is large! In order to achieve Akatsuki's performance, there was a problem in that a large amount of combustion air was flowed into the vaporization cylinder 2, the vaporization surface 16 was cooled, and the combustion air 1 could no longer be vaporized. Therefore, if the combustion air flowing into the vaporizer cylinder 2 is reduced in order to increase the capacity, the mixture of the vaporized fuel and the combustion air will be incomplete, and if the combustion state becomes excessively airy, the combustion flame 17 will Riff 1-
occurs, and when there is a lack of air, yellow flame is generated in the combustion flame 17, resulting in deterioration of exhaust gas characteristics due to the generation of -carbon oxide and soot.

Therefore, an object of the present invention is to prevent combustion flame lift and yellow flame generation by promoting the mixing of vaporized fuel and combustion air, and to obtain better or better gas characteristics.

Means for Solving the Problems In order to achieve the above object, the present invention provides a mixing promoting plate in the mixing chamber, located above the mixture population of the mixing chamber and the mixture outlet of the carburetor cylinder. .

Operation The combustion apparatus of the present invention has the above-mentioned configuration, which promotes mixing of vaporized fuel and combustion air, and provides good tJF gas characteristics.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In FIG. 1, reference numeral 18 denotes a vaporizer having a built-in heater 19. The vaporizer 18 has an air-fuel mixture outlet 20 in its upper part, and a vaporizing air inlet 21 in its lower part. A swinging plate 22 using a flat disc and a conical rotor 23 are provided in the vaporizer I8 via this vaporizing air mass 21. The swinging plate 22 and the rotor 23 are connected to a motor shaft 24 and a motor 25.

A fuel supply pipe 26 is provided with a gap below the side surface of the rotor 23.
One end is close to the fuel supply pump 27, and the other end is connected to the fuel supply pump 27. A vaporizing air chamber 2B is provided around the motor 25, and a vaporizing air chamber 29 is provided in a part of the vaporizing air chamber 2B. Further, a carburetor cover 31 is provided around the carburetor 18 with a heat insulating material 30 in between. The heat insulating material 30 and the carburetor cover 31 are provided with an air-fuel mixture outlet 20 and a vaporizing air port 21 penetrating therethrough. An air passage 33 communicating with the blower 32 is provided around the vaporizer cover 31 and the vaporizing air chamber 28 .

A mixture isolated from the carburetor 18 via a conveying air passage 34 that is provided with a gap above the air-fuel mixture outlet 20 of the carburetor 18 and the surrounding carburetor cover 31 and communicated with the air passage 33. A chamber 35 is provided. A mixture inlet 36 is provided at the bottom of the mixing chamber 35 at a position opposite to the mixture outlet 20 of the carburetor 18 . In the mixing chamber 35, a plate-shaped mixing promotion plate 37 is provided above the mixture inlet 36 and facing the mixture inlet 36 and the mixture outlet 20. The mixing promotion plate 37 is provided with a diameter larger than the opening diameter of the air-fuel mixture inlet 36. A flame hole 39 divided by a plurality of secondary air jetting passages 38 is provided in the upper part of the mixing chamber 35 . The secondary air jetting passage 38 is provided in a configuration that does not communicate with the mixing chamber 35, is provided around the mixing chamber 35, and is in communication with the air passage 33 and the conveying air passage 34.
It communicates with the next air passage 40. Secondary air blowout passage 3
A plurality of i secondary air ejection holes 41 are provided in the upper part of the air conditioner 8.

42 is a combustion flame.

Next, the operation of the configuration of this embodiment will be explained. First, by operating the fuel supply pump 27, fuel is supplied to the rotor 23 through the fuel supply pipe 26, and as the motor 25 rotates, the fuel rises along the conical side surface of the rotating rotor 23 via the motor shaft 24. It is atomized and scattered from the shaker plate 20, and is vaporized on the side wall heated by the heater 19 of the vaporizer 18. This vaporized gas is carried out from the air-fuel mixture outlet 20 by the vaporizing air flowing into the vaporizing air chamber 28 from the air passage 33 via the vaporizing air intake 29 and flowing from the vaporizing air inlet 21 of the vaporizer 18. It will be done. Most of the air rises through the air passage 33 from the blower 32 and is divided into conveying air and secondary air. The conveying air flows from the conveying air passage 34 into the mixture inlet 36 of the mixing chamber 35 together with the vaporized gas carried out from the mixture outlet 20 of the carburetor 18, and the conveying air and vaporized gas flow into the mixing promotion plate 37. Mixing is promoted by the simultaneous collision, and the mixture rises in the mixing chamber 35 and reaches the flame hole 39, where it is ignited by an igniter (not shown) and burns.
, flows into the secondary air jetting passage 38 from the secondary air passage 40, jets out from the secondary air jetting hole 41, wraps around the combustion flame 42 formed in the flame hole 39, and shortens the flame length. Promotes high-load combustion.

Then, lift due to non-uniform mixing due to increased air flow when there is excess air in the combustion state, and yellow fire due to insufficient mixing when air is insufficient, cause collision of vaporized gas and conveying air to the mixing promotion Fi 37, By appropriately dispersing each of them, it is possible to promote uniform mixing and prevent lift and occurrence of yellow flame. In addition, the mixing promotion plate 3
7 prevents the straight upward movement of vaporized gas and conveying air, thereby preventing the combustion flame 42 above the flame hole 39 from forming a protruding flame, and making the distribution of the combustion flame 42 uniform and short. Can be done. By improving the exhaust gas characteristics of the combustion flame 42, the stable combustion range can be expanded, and variations in the fuel supply pump 27 and the blower 32 can be easily managed. In addition, since the diameter of the mixture promoting plate 37 is set larger than the diameter of the mixture inlet 36, all of the conveying air rising to surround the vaporized gas collides with the mixing promoting plate, further promoting mixing. Can be done.

Effects of the Invention As described above, in the present invention, the mixing promoting plate is provided in the mixing chamber so as to face each other above the air-fuel mixture inlet of the mixing chamber and the air-fuel mixture outlet of the vaporizing cylinder, so that the vaporized gas and the conveying air are simultaneously supplied. Collision with the mixing promotion plate promotes mixing, prevents lift of the combustion flame that occurs when there is excess air in the combustion state, and prevents yellow flame that occurs when there is insufficient air, thereby expanding the stable combustion range. In addition, since the flow of vaporized gas and conveying air that rises in a straight line is blocked by the mixing promotion plate, vaporized gas and conveying air can reach the peripheral wall inside the mixing chamber, making the distribution of the combustion flame uniform and shortening the flame. be able to.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a combustion device according to an embodiment of the present invention, and FIG. 2 is a partial sectional view of a conventional combustion device. 18... Carburizer, 2o... Air mixture outlet, 34... Conveying air passage, 35...
Mixing chamber, 36...Mixture inlet, 37...
・Mixing promotion board.

Claims (1)

[Claims] a vaporizer; a mixture outlet provided at the top of the vaporizer; a mixing chamber provided above the vaporizer via a conveying air passage; A combustion engine comprising: a mixture inlet located at a position facing the mixture outlet of the carburetor; and a mixing promoting plate provided in the mixing chamber above the mixture inlet of the mixing chamber and the mixture outlet of the carburetor. Device.