JPS6138964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device, and has the following objects.

Instantly forms a main flame without preheating, and makes the main flame a premixed combustion blue flame.
Obtain good combustion characteristics.

During the initial mixing with the atomized particles, the numerous air ejection holes in the middle cylinder mix evenly around the middle cylinder with a high-speed swirling flow, and by gradually weakening the swirling force toward the top of the middle cylinder, The combustion process smoothly transitions from mixing to evaporation to vaporization to combustion, and the laminar flow combustion prevents pulsation and vibration and reduces combustion noise.

By dividing the blue flame of premixed combustion, the volume of the combustion chamber is reduced and the overall shape is made more compact.

Since the flame can be brought into even contact with the combustion chamber wall, the heat exchange rate with the water storage section is increased.

In a liquid fuel combustion device equipped with a conventional nozzle, combustion spray and combustion air are supplied into the combustion cylinder from the same support surface, and the combustion air is supplied by a swirl vane provided at the tip of the atomization means. is rotated by
Diffusion combustion occurred due to mixing of this swirling air flow and fuel particles sprayed by the atomizing means. In this combustion, mixed particles of combustion air and atomized particles are ignited by an igniter, and a main flame is instantaneously formed to continue combustion. Therefore, at the time of ignition, instantaneous explosive combustion occurs and a loud ignition sound is produced. In addition, during stable combustion, the spray particles are atomized into the flame that has been formed, so they receive the high heat of the flame, resulting in droplet combustion of the spray particles, and the carbon in the particles is burned, resulting in the formation of soot. Outbreaks are likely to occur. Furthermore, the flame that is formed has a conical shape centered around the flame stabilizing plate provided at the tip of the nozzle, and is susceptible to fluctuations in the flame due to changes in spray particle diameter, spray amount, combustion air amount, etc., and pulsates. Generates noise and loud combustion noise. Furthermore, the combustion cylinder diameter is determined by the flame length. Therefore, in order to reduce the combustion cylinder diameter,
It is necessary to shorten the flame length, and there is a limit to the diffusion combustion. In addition, in the atomization means, swirling vanes to swirl the combustion air, flame-holding plates to hold the flame, etc. are necessary for proper combustion, and disadvantages include complicated assembly and maintenance. It was hot.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a nozzle used as atomization means, which is connected to an oil feed pipe 2, and liquid fuel sent from an oil tank (not shown) is sent to an electromagnetic pump 3,
The oil is sprayed from the tip of the nozzle 1 through the oil pipe 2. Reference numeral 4 denotes a support cylinder incorporating a nozzle 1, an oil pipe 2 connected thereto, an igniter 5, etc., and an opening 8 at the bottom of the can body 7, which is composed of an inner shell 6 and an outer shell 6'.
The tip of the nozzle 1 and the tip of the ignition device 5 are provided so as to face the combustion chamber 9 through the ignition device. 10 is a motor 11 and a fan 1 located at the center of the bottom of the combustion chamber 9.
2. A middle cylinder installed vertically so that combustion air from a blowing mechanism composed of a fan case 12' is sent through a wind cylinder 13, and a large number of air jet holes 17 are provided around the side wall of the middle cylinder 10. It is provided. Reference numeral 14 is a cylindrical auxiliary combustion cylinder provided between the middle cylinder 10 and the inner cylinder 6 and provided with an opening 15 to prevent particles ejected from the nozzle from colliding with each other. They are installed vertically to form a mixing and vaporizing chamber between them.

The plurality of air jet holes 17 of the middle cylinder 10 are arranged in such a manner that the turning force is gradually weakened from the bottom to the top.

18 is a ring that controls the flow and pressure of combustion gas within the combustion chamber 9.

The operation will be explained below. The difference from conventional combustion systems is that combustion air and fuel particles are supplied separately. Combustion air is supplied to the middle cylinder 10 via the wind cylinder 13 by a blowing mechanism composed of a motor 11, a fan 12, and a fan case 13, and is ejected from the air jet hole 17 of the middle cylinder 10.

Here, the air jet direction in the height direction of the middle cylinder 10 is
As shown in FIG. 3, along the outer peripheral wall of the lower middle cylinder 10, from an angle close to the connection direction (A in FIG. 3),
The turning force is gradually weakened (B in Fig. 3), and the flame stabilizing portion at the tip (C in Fig. 3) becomes vertical along the outer peripheral wall.

On the other hand, fuel particles are sprayed from the nozzle 1, pass through the opening 15 of the auxiliary combustion cylinder 14, mix with the lower high-speed swirling flow, and are ignited by the ignition device 5.

After ignition, mixing is completed in the mixing and vaporizing chamber 16 while weakening the swirling force, and a flame holding state is formed from the large number of air jet holes 17 with weak swirling force in the upper part of the middle cylinder 10.
Therefore, the flame is maintained in a nearly independent laminar flow.

The combustion process includes mixing between the middle cylinder 10 and the auxiliary combustion cylinder 14,
The spray particles and the swirling air flow are mixed in the vaporization chamber 16, the evaporation of the mixed particles is promoted by the radiant heat of the combustion flame, and vaporization combustion occurs in the upper air injection hole 17 of the middle cylinder 10.

As is clear from the above description, the present invention has the following effects.

The combustion process is mixing, evaporation/vaporization, and combustion.
Since the atomization means uses pressure spray, instant ignition is possible without a preheating mechanism, and a blue flame of premixed combustion can be obtained, resulting in good combustion characteristics.

With conventional flame stabilization using flame stabilizing plates, the balance between flame and flame stabilization is disrupted due to the influence of the amount of spray and the amount of combustion air, resulting in pulsating noise. Divide the flame into small pieces,
Each one maintains flame independently, so
Pulsation noise is eliminated and combustion noise is reduced.

Since the blue flame that is formed can come into even contact with the combustion chamber wall, the heat exchange within the combustion chamber is not limited to the radiant heat of the flame as in the conventional method, but the combustion gas can also sufficiently heat the inside of the combustion chamber. Heat exchange efficiency increases.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a liquid fuel combustion device according to an embodiment of the present invention, FIG. 2 is a plan sectional view of main parts,
FIGS. 3a to 3c are diagrams showing details of the middle cylinder and air jet holes. 7... Can body, 8... Opening, 9... Combustion chamber, 1
0... middle cylinder, 14... auxiliary combustion cylinder, 15... opening,
17...Air vent.

Claims (1)

[Claims] 1. A bottomed cylindrical can body having a combustion chamber inside, a liquid fuel atomization means facing the internal combustion chamber from an opening provided in the can body, and a middle cylinder installed vertically in the combustion chamber. and an auxiliary combustion cylinder that is provided between the middle cylinder and the can body and has an opening at a portion facing the atomizing means, and forms a swirling flow around the middle cylinder from the bottom to the top of the middle cylinder. A liquid fuel combustion device in which a plurality of air injection holes are provided in multiple stages, and the upper air injection hole has a shape or size that gradually weakens the swirling force than the lower air injection hole.