JPH0344980Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotary atomizing combustion device with a relatively low combustion amount used in home heating devices and the like.

Conventional configuration and its problems Conventionally, in this rotary atomizing combustion device, as shown in FIG. A mesh ring 4 is provided as an evaporation accelerator for liquid fuel on the outer peripheral extension of the rotary plate 1, apart from the inner wall of the combustion cylinder 3, and an ignition plug 5 is installed between the mesh ring 4 and the inner wall of the combustion cylinder 3. The ignition device is configured with Rotating plate 1
After colliding with the mesh ring 4, the liquid fuel sprayed from the mesh ring 4 evaporates while further spreading on the mesh ring 4, and is ignited by the ignition plug 5.

However, this rotary atomization combustion device had the following drawbacks.

(1) Rotary atomizers have larger particle sizes than hydraulic injection valves, which use pressure to inject fuel at high speed from a nozzle to atomize it. For this reason, even if the net ring 4 is provided to promote evaporation of the liquid fuel, the amount of evaporation of the liquid fuel at room temperature is small, and if there is a large amount of liquid fuel, the liquid fuel wraps around the net ring 4 and prevents the effect of promoting evaporation. Therefore, the ignitability was poor, and at the same time, at the beginning of ignition, not all of the supplied fuel could be combusted, resulting in drainage.

(2) In this configuration, since the spark plug 5 is located above the mesh ring 4, only radiant heat can be used as the heat of the spark plug 5 to promote fuel evaporation. Therefore, it is difficult to quickly raise the temperature of the mesh ring 4.

(3) According to experiments, initial flame stabilization occurs near the spark plug 5, but due to the structure, heat transfer to the mesh ring 4 mainly involves heat conduction, so self-combustion heat cannot be fully utilized; Since the heat capacity of the mesh ring 4 is large, the temperature rise of the mesh ring 4 is slow. Therefore, it takes a considerable amount of time for combustion to start up, and at the same time, as the temperature of the combustion tube 3 rises, the oil contained therein rapidly evaporates, generating soot and CO, resulting in transient abnormal combustion.

Purpose of the invention The present invention aims to eliminate such conventional drawbacks.
The purpose of the present invention is to obtain a rotary atomizing combustion device that performs reliable ignition and has a short combustion rise time.

Structure of the invention In order to achieve this object, the present invention includes a plurality of mesh bodies provided on the outer periphery of the rotating plate and protruding from the combustion cylinder periphery toward the approximate center of the combustion cylinder in a direction perpendicular to the bottom surface of the combustion cylinder. , and an ignition plug located near one of the mesh bodies and protruding toward the center from the inner circumferential surface of the combustion cylinder.

With this configuration, the temperature of the mesh with a small heat capacity rises quickly, and the sprayed fuel that inhibits evaporation is allowed to fall from the end of the mesh, so the evaporation promoting effect of the mesh can be maintained. Since it can be effectively transmitted to the body, it can be ignited in 2 to 3 seconds.

Furthermore, since the flame generated by the above-mentioned ignition heats the adjacent mesh bodies, the flame can quickly spread to a plurality of mesh bodies, and the combustion start-up time can be shortened.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be explained below with reference to FIGS. 2 and 3.
This will be explained using figures.

In FIGS. 2 and 3, 6 is a cylindrical fan case, and 7 is a blower tube, which is connected to the fan case 6 through a packing. A motor 8 is installed in the center of one end of the fan case 6, and the tip of the motor shaft 9 extends into the combustion tube 3. An air intake port 10 is provided on the side of the fan case 6, and 11 is a turbo fan installed and fixed in the middle of the fan case 6.
A plurality of stages are provided, and on the discharge side of the turbo fan 11 there are guide blades 12 fixed to the fan case 6,
A guide plate 13 is also provided on the entrance side. 14 is a partition plate fixed to the fan case with a plurality of communication ports 166 provided on the outer periphery with a certain gap from the final stage turbo fan 11, and a gap adjustment plate 17 provided in the center to adjust the primary air. , sleeve 18
A constriction section 19 is formed between the two. The bottom surface of the combustion tube 3 and the partition plate 14 are connected via a heat-resistant packing. A pressure regulating chamber 20 is provided between the partition plate 14 and the final stage turbofan 11 by a partition tube 15.
A branching chamber 21 is provided on the outer periphery of the pressure regulating chamber 20.
The air sent from the turbo fan 11 at the final stage is divided into two parts in the separation chamber 21, one of which enters the pressure adjustment chamber 20 through the gap 22 and reaches the constriction part 19.
The cooling air for the rotary plate 1 and the primary air are supplied to the bottom surface of the combustion tube 3 through the flow chamber 21, and the other air is guided from the distribution chamber 21 to the air chamber 23 on the outer periphery of the combustion tube 3 through a plurality of communication ports 16, where it is used for combustion. The air is supplied to an air jet hole 24 for forming a swirling flow, which is formed of a cut-and-raised hole or the like provided in the inner wall of the cylinder 3. The amount of primary air supplied from the flow dividing chamber 21 is set to an optimum amount by changing the gap between the gap 22 and the constriction part 19.

A conical cone 2, a disc-shaped rotary plate 1, and a heat shield plate 25 larger than the rotary plate 1 are fastened to the tip of the motor shaft 9 in the above order with fixing nuts to form a rotary atomizer. and is provided near the constriction portion 19. Reference numeral 26 denotes a plurality of mesh bodies 5 provided on the outer peripheral extension of the rotary plate 1 and protruding from the circumferential surface of the combustion tube 3 toward the approximate center of the combustion tube 3 in a direction perpendicular to the bottom surface of the combustion tube 3.
is an ignition plug installed near the mesh body 26' and on the upstream side of the swirling flow, and is connected to the pin 2 fixed to the bottom surface of the combustion tube 3.
Discharge to 7. The mesh body 26 is an evaporation accelerator and is made of heat-resistant glass, wire mesh, or the like. Reference numeral 28 denotes a refueling pipe, which is connected via an external refueling device such as a fuel pump (not shown), and is connected to the cone 2 from the pressure regulating chamber 20.
It opens upwardly and closely.

The air jet holes 24 for forming a swirling flow provided on the inner wall of the combustion tube 3 are provided so that a swirling flow can be formed in the same direction as the rotating direction of the rotary plate 1, and the air jet holes 24 on the side near the bottom of the combustion tube are The number of air injection holes is small, and a large number of air injection holes are formed on the tip side of the combustion tube. 29
indicates the swirling direction of the air flowing in from the air jet hole 24. Note that the same members as in FIG. 1 are given the same numbers.

In the above configuration, when the motor 8 is activated at the start of combustion, the turbo fan 11, the cone 2, the rotating plate 1, and the heat shield plate 25 rotate together with the rotation of the motor shaft 9. When the turbo fan 11 generates wind pressure, combustion air flows into the fan case 6 from the air intake port 10, is pressurized by the turbo fan 11, and then is sent to the flow dividing chamber 21. At this time, the pressurized airflow within the flow dividing chamber 21 is divided into two. One side is gap 2
2, from the pressure regulating chamber 20 through the constriction part 19
Next becomes air. The other air enters the air chamber 23 through the communication port 16 and is ejected from the air jet hole 24 into the combustion cylinder 3 to form a swirling flow, and this swirling flow collides with the mesh body 26 to supply air to the mesh body 26 .

Next, when the spark plug 5 is energized and a high-voltage discharge spark is generated between the spark plug 5 and the pin 27, the high-voltage discharge spark heats the mesh body 26' near the spark plug 5, causing the mesh body 26' to suddenly rise to a high temperature. This makes it possible to ignite in a short time. In this state, the fuel pump (not shown)
Electricity is applied to supply oil onto the cone 2 from the oil supply pipe 28. The liquid fuel supplied onto the cone 2 moves toward the larger diameter of the cone 2 due to centrifugal force, and finally travels along the rotating plate 1, where it spreads uniformly into a thin film and is sprayed in the outer circumferential direction at the outer peripheral edge of the rotating plate 1. Ru. Most of the sprayed fuel reaches the mesh body 26 after colliding with the inner wall of the combustion cylinder 3, but the sprayed fuel that exceeds the surface tension of the mesh body 26 falls from the end of the mesh body 26, so that the evaporation promoting effect of the mesh body is reduced. Can be maintained. However, in the mesh body 26' which is in a high temperature state due to high-pressure discharge sparks, the attached spray fuel is evaporated, and the evaporated fuel and the air forming the swirl flow form a vortex on the downstream side of the mesh body 26'. When mixed and ignited by a high-voltage discharge spark, a stable soot-free fire can be formed in the net 26'. This flame extends for a long time due to the strong swirling flow, and rapidly heats the net 26 on the downstream side to a high temperature, so that the fuel evaporated from the net 26 can instantaneously form a flame. Once combustion is started in this way, the flame quickly spreads to the plurality of nets 26, and the flame grows rapidly, raising the temperature of the inner wall of the combustion tube 3 within a short period of time, and starting full-scale gasification combustion. . If such self-combustion heat allows continuous gasification of liquid fuel, high-pressure discharge sparks will become unnecessary. Therefore, combustion continues even if the ignition plug is de-energized by appropriate means.

Effects of the invention As described above, the rotary atomization combustion device of the invention provides the following effects.

(1) Since a plurality of nets are provided on the outer peripheral extension of the rotating plate, protruding from the circumferential surface of the combustion cylinder, the heat capacity is smaller than that of a conventional mesh ring, so the temperature of the nets rises faster. Furthermore, since the atomized fuel that exceeds the surface tension of the mesh falls from the end of the mesh, the evaporation promoting effect of the mesh can be maintained.

(2) One of the nets is provided near the ignition plug and on the downstream side of the swirling flow formed by the air ejected from the air outlet. This swirling flow is weak near the inner surface of the combustion cylinder and becomes stronger as it moves away from the combustion cylinder, so the net near the downstream of the spark plug absorbs the heat of the spark plug due to the heat transfer caused by the strong swirling flow, which rapidly increases the temperature. It becomes possible to ignite.

(3) The mesh is installed vertically on the bottom of the combustion cylinder, that is, so that it collides with the swirling flow, so air is supplied by the strong swirling flow, and this air and the sprayed fuel evaporated from the mesh are separated by the mesh. Since the mixture is mixed while creating a vortex on the downstream side, a stable soot-free flame can be formed.

(4) The flame formed on the mesh extends for a long time due to the strong swirling flow, and the downstream mesh is rapidly heated to a high temperature, so the fuel evaporated from the downstream mesh instantly forms a flame. I can do it. In this way, once combustion is started, the fire can quickly spread to a plurality of mesh bodies, and the combustion start-up time can be shortened.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional heaterless rotary atomization combustion device that directly ignites and burns atomized fuel;
FIG. 2 is a longitudinal cross-sectional view showing a rotary atomizing combustion apparatus which is an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line A-A' in FIG. 1... Rotating plate, 3... Combustion tube, 5... Spark plug,
24... Air outlet, 26, 26'... Net body.

Claims (1)

[Scope of utility model registration request] A large number of air injection holes cut and opened in the same direction on the circumferential surface of the combustion tube, a rotary plate provided at the bottom of the combustion tube for atomizing liquid fuel, and an outer peripheral extension of the rotary plate, and a plurality of mesh bodies provided vertically on the bottom surface of the combustion cylinder and protruding from the inner circumferential surface of the combustion cylinder toward the center of the combustion cylinder; and one of the mesh bodies.
A rotary atomizing combustion device comprising an ignition plug located near the combustion cylinder and protruding toward the center from the inner circumferential surface of the combustion cylinder.