JPS5838261Y2 - combustion device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a combustion device that vaporizes liquid fuel, premixes it with combustion air, and burns it, and particularly relates to the structure of a liquid fuel spraying section.

Conventionally, a liquid fuel nozzle device was installed in the middle of a heating passage for combustion air, and used a nozzle tip to spray liquid fuel into the air. The combustion particles that were atomized were caught in the gap between the nozzle device and the device fixture, and could condense at low temperatures.

If such liquid fuel that condenses is always present during combustion, there are disadvantages such as the concentration of the mixture of combustion air and vaporized fuel becoming uneven, and after combustion stops, it vaporizes and generates an odor.

This invention was made in order to eliminate the above-mentioned conventional drawbacks.

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

In FIG. 1, numeral 1 has an internal cavity 1a and is made of an aluminum alloy material and has a relatively high heat storage property; 2 is a main body formed in the internal cavity 1a, and a mixture of combustion air and vaporized fuel; 3 is a preheater buried in the lower part of the main body 1; 4 is an annular passage formed around the combustion chamber 2 by the main body 1; the combustion heat from the combustion chamber 2 is transmitted through the combustion chamber wall 2a; and heated.

Reference numeral 5 denotes an air supply port that sends combustion air sent out by a blower (not shown) to the starting end of the annular passage 4; 6 denotes a nozzle device that sprays liquid fuel into the combustion air in the middle of the annular passage 4; The tip is the through hole 4 of the passage outer wall 4a.
It is provided so as to face the inside of the passage 4 through b.

Reference numeral 7 denotes an air supply port for feeding air into the gap between the nozzle device 6 and the mounting tube 6a of the nozzle device, and is connected to the above-mentioned blower (not shown) through a relatively thin pipe.

Therefore, a portion of the combustion air from the blower (not shown) is supplied to the air supply lower.

8 is a combustion plate provided on the upstream side □ of the combustion chamber 2, and has a large number of flame ports 8a.

Reference numeral 9 denotes a mixing cylinder of a predetermined length whose periphery is fitted and held relatively tightly into the cavity 1a within the main body, and numeral 10 refers to a bowl-shaped mixing cylinder attached to the main body 1 with a predetermined gap between it and the mixing cylinder 9. It is an outer cylinder, and forms a U-shaped mixing promotion passage 11 together with the mixing cylinder 9 .

In this configuration, when starting operation,
The preheater 3 is energized to heat the combustion chamber 25 passage 4 and the mixing tube 9 through the main body 1, and when a predetermined temperature is reached, the air supply port 5. Combustion air is fed into the passage 4 from the air supply lower.

The liquid fuel is sprayed from the nozzle device 6 into the combustion air heated in the passage 4 to raise its temperature, thereby vaporizing it and mixing it with the combustion air.

A part of the liquid fuel that has been sprayed and turned into particles is transferred to the air supply port 5.
Since the combustion air generated in the air creates a vortex near the nozzle device 6, it tries to be pushed into the gap between the nozzle device 6 and the nozzle device mounting tube 6a, but the air pressure of the air supply lower bypassed by the blower (not shown) It is pushed back because it is expensive.

In the end, all the atomized particles are vaporized in the combustion air,
It flows through the passage 4, a communication port (not shown) between the passage 4 and the mixing promotion passage 11, and the mixing promotion passage 11, and reaches the mixing cylinder 9.

Also, in this process, the mixing of the air-fuel mixture is promoted.

Next, the air-fuel mixture is supplied to the combustion chamber 2 through the multiple flame ports 8a of the combustion plate 8, where it is ignited by a spark plug (not shown) to start combustion.

Once combustion starts, the passage 4 and the like are heated by the combustion heat, so preheating is performed only by recovering the combustion heat.

As described above, in this invention, air is supplied toward the through hole around the nozzle device that sprays fuel into the passage through the through hole in the outer wall of the combustion air passage, so that the liquid fuel sprayed from the nozzle is It prevents fine particles from entering into the gap in the installation part of the nozzle device, vaporizes all the sprayed fine particles and mixes them with the combustion air, and at the same time performs combustion with a stable mixed concentration. Since no unevaporated liquid fuel remains in the combustor, no odor is generated as in the conventional case.

In addition, with conventional systems in which the entire amount of combustion air is supplied around the nozzle, the area around the nozzle is cooled by the combustion air, causing fine particles of liquid fuel sprayed from the nozzle to condense. Since a part of the combustion air is supplied around the nozzle device, the amount of cooling near the nozzle device is also small, and the liquid fuel is supplied together with fine particles of liquid fuel into the combustion air that has been previously heated by combustion heat. It has the effect of completely vaporizing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a combustion device showing an embodiment of this invention.
FIG. 2 is a sectional view showing a main part taken along line II--II in FIG. 1. Note that the same reference numerals in the figures indicate the same or corresponding parts. In the figure, 1 is the main body, 2 is a combustion chamber, 4 is an annular passage, 4a is an outer wall of the passage, 4b is a through hole, 5 is an air supply port, 6 is a nozzle device, 7 is an air supply port, and 8 is a combustion plate. .

Claims (1)

[Scope of utility model registration request] a combustion chamber that combusts a mixture of combustion air and vaporized fuel;
A passage provided around the combustion chamber to heat the combustion air using combustion heat from the combustion chamber, an air supply port for feeding the combustion air sent out by a blower to the starting end of this passage, and an air supply port in the middle of the passage. a nozzle device that sprays liquid fuel into the combustion air heated in the passage through a through hole in the outer wall of the passage to generate the vaporized fuel; A combustion device comprising a device for supplying air toward the through hole around the nozzle device.