JPS6016825Y2 - combustion device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion device that ignites liquid fuel dispersed in the form of mist by centrifugal force.

Conventional combustion devices of this type have a minimum calorific value of approximately 2,500 KCal/h, and lowering the calorific value below this value causes pulsating combustion, making normal combustion difficult, and a sheathed heater is required to preheat the burner body during normal ignition. Therefore, there are disadvantages such as not only being forced to consume electricity for preheating, but also requiring time to preheat the heater, so it takes time to start.

Therefore, the present invention does not use a preheating heater, but at the time of ignition, the atomized liquid fuel (for example, kerosene) is ignited by the rotation of the ignition fuel guide and the centrifugal diffuser plate to heat the heating part of the heating liner. This heat is conducted to the vaporization section of the heating liner, and when this vaporization section reaches a predetermined high temperature, the liquid fuel from the combustion oil pipe is dripped onto the circumferential surface of the vaporization section and vaporized, resulting in vaporization combustion. By configuring the switch to switch, the above-mentioned drawbacks of the prior art are attempted to be overcome.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Fig. 1 is a side sectional view of a combustion device according to the present invention, and in the figure, numeral 1 has an intake port 2 opened at the bottom surface. The casing 1 forms an air chamber 3.

An electric motor 5 is fixed to the inner surface of the rear end (right end in the drawing) of the casing 1 via a motor mounting bracket 4.

This electric motor 5 is arranged so that a rotating shaft 6 protrudes from the middle 6 part of the air chamber 3, and a conical fuel guide 7 for ignition and a centrifugal diffusion plate are attached to a threaded end 6a of the rotating shaft 6. 8 are fitted in this order, and both 7 and 8 are attached to the threaded portion 6a using a nut 9 that is screwed into the threaded portion 6a.

10 is a burner body having an annular outer wall 11 and an annular inner wall 12; the rear end of the outer wall 11 of the burner body 10 is fixed to the front end opening 1a of the casing 1 via a heat insulating material 13; 12 is arranged to face the combustion chamber 14, and the front part of the mixing chamber 15 formed between the outer wall 11 and the inner wall 12 is connected to the combustion chamber 14 through a large number of flame ports 16, and to the mixing chamber 14. The rear portions of the chambers 15 communicate with the air chambers 3 mentioned above.

Further, an annular heating liner 19 comprising a heating wall 17 and a vaporization wall 18 is installed between the burner body 10 and the ignition fuel guide 7 described above.

In other words, the heating liner 19 is constructed between the burner body 10 and the ignition fuel guide 7 by integrally connecting and fixing a part of the outer circumference of the heating liner 19 to the rear end of the inner wall 12 of the burner body 10. This is what I did.

The heating liner 19 constructed in this way has a heating wall 17 protruding toward the combustion chamber 14, and the tip of the heating wall 17 is located forward (to the left in the drawing) of the centrifugal diffusion plate 8. That's what I do.

Further, the vaporization wall 18 of the heating liner 19 is made to protrude toward the school air chamber 3 side, and an oil-impregnated annular body 20 is fitted onto the outer periphery of this vaporization wall 18.

This oil-impregnated annular body 20 is made of ceramic, foamed metal,
Porous metals such as metal fiber felt and stainless wool can be used.

Furthermore, a partition ring 21 is provided on the inner periphery of the heating liner 19.
An annular passage 22 is formed between the inner circumferential surface of the leading ring 21 and the outer circumferential surface of the fuel guide 7 to allow the combustion chamber 14 and the air chamber 3 to communicate with each other.

Further, the tip opening 23a of the ignition oil pipe 23 is opposed to the surface of the fuel guide 7, and the tip opening 24a of the combustion oil pipe 24 is opposed to the peripheral surface of the oil-impregnable annular body 20. There is.

Each of the oil feed pipes 23 and 24 is connected to a common electromagnetic pump 27 through an ignition solenoid valve 25 and a combustion solenoid valve 26, respectively, and when one of the solenoid valves 26 is opened, oil is supplied from an oil tank (not shown). liquid fuel (for example, kerosene) is sent to the circumferential surface of the ignition combustion guide 7 via the electromagnetic pump 27 and the ignition oil supply pipe 23, and when the other electromagnetic valve 26 is opened, liquid fuel from an oil tank (not shown) is sent. It is configured to send oil (for example, kerosene) to the circumferential surface of the oil-bearing annular body 20 via the electromagnetic pump 27 and the combustion oil pipe 24.

The ignition element 28 is placed inside the heating wall 17 of the heating liner 19 and facing near the heating wall 17. The ignition element 28 is an electric ignition element that generates an ignition spark. is used.

Further, the combustion solenoid valve 26 is configured such that the temperature of the vaporization wall 18 in the heating liner 19 is a predetermined gasification temperature (for example, about 3
When the temperature reaches 00°C, this is detected by a temperature sensor (not shown) and the ignition solenoid valve 25 is overlapped with the ignition solenoid valve 25 for about 5 to W seconds to switch from closed to open, or the ignition element 28
At the time of ignition, a timer (not shown) is activated, and after the time has elapsed for the temperature of the vaporization wall 18 to reach a predetermined gasification temperature, the ignition solenoid valves 25 and 5 are activated by the timer's time-up.
It is designed to switch from closed to open with an overlap of about 100 seconds.

Further, although the electric motor 5 is stopped at the same time as the ignition solenoid valve 25 is closed, it does not necessarily have to be stopped.

Note that when the electric motor 5 is used to drive the combustion fan, the electric motor 5 is operated both during ignition and during vaporization operation.

An air supply duct is connected to the intake port 2 provided in the casing 1, and combustion air is supplied into the air chamber 3 by a fan (not shown).

Although the illustrated embodiment is configured as described above, the following is explained below.
Explain the action.

Now, when the electric motor 5 is driven, the ignition fuel guide 7 attached to the rotating shaft 6 and the centrifugal diffusion plate 8 rotate.

Further, at the same time as the electric motor 5 is driven, the ignition solenoid valve 25
When opened, liquid fuel from the electromagnetic pump 27 is sent through one of the oil feed pipes 23, and the liquid fuel is rotated at high speed from the tip opening 23a of the oil feed pipe 23 to the peripheral surface of the ignition fuel guide 7. is dripped on.

The linked liquid fuel sequentially moves forward (to the left in the drawing) due to the difference in peripheral speed of the liquid guide 7, and then reaches the centrifugal diffusion plate 8.

The liquid fuel that has reached the diffusion plate 8 is diffused along one side (the right side in the drawing) of the diffusion plate 8 due to the centrifugal force caused by the high speed rotation of the diffusion plate 8, and then spreads through the air intake port 2, the air chamber 3, and Together with the air flowing out through the annular passage 22, the air is scattered in the form of mist and evenly falls on the inner surface of the surrounding heating wall 17.

When the ignition element 28 is energized at this point, an ignition spark is generated and the atomized fuel is ignited, and the heating wall 17
Live combustion occurs on the inner surface of the annular heating wall 17, and the flame spreads along the entire inner surface of the annular heating wall 17.

When raw combustion begins in this way, the heating wall 17 is gradually heated, and this heat is conducted to the vaporization wall 18 provided at the rear of the heating liner 19, and the temperature of this vaporization wall 18 increases.

When the temperature of the vaporization wall 18 reaches a predetermined gasification temperature (for example, about 300° C.), the combustion solenoid valve 26 overlaps with the ignition solenoid valve 25 by about 5 to 100 seconds. is switched from closed to open, and the ignition solenoid valve 25 is switched from open to idle.

In this way, when the combustion solenoid valve 26 is opened, liquid fuel from the oil tank (not shown) passes through the electromagnetic pump 27 and the combustion oil feed pipe 24 and from the opening 24a at the tip thereof to the circumferential surface of the oil-bearing annular body 20. is dripped on.

The liquid fuel dropped onto the circumferential surface of the oil-containing annular body 20 is diffused over the entire circumferential surface of the annular body 20 by, for example, capillary action, and is vaporized by the vaporization wall 18 maintained at a high temperature.

The fuel vaporized in this manner on the entire circumferential surface of the annular body 20 mixes with the air from the intake port 2, and this mixture (combustion gas) is distributed around the annular surface of the burner body 10 as shown by the solid arrow in FIG. The fuel is supplied to the combustion chamber 14 from a mixing chamber 15 and a large number of flame ports 16 formed in the burner body 10, and is vaporized and burned.

At this time, it goes without saying that the secondary combustion air from the intake port 2 is supplied to the combustion chamber 14 through the air chamber 3 and the annular passage 22, as shown by the dotted arrow in the figure.

Here, the heating wall 17 of the heating liner 19 is heated from the inside during ignition (pilot time), and during steady combustion it is heated by self-combustion heat from the flame port 16 side, that is, from the outside. The vaporization wall 18 provided at the rear of the combustion chamber can always be maintained at a constant temperature (gasification temperature), and as a result, instantaneous gasification of the liquid fuel during combustion can be maintained.

Furthermore, since the oil-impregnating annular body 20 is provided on the outer periphery of the vaporization wall 18, the liquid fuel can be diffused over the entire circumferential surface of the annular body 20, for example, by capillary action.

Moreover, during vaporization combustion, the air-fuel mixture (combustion gas)
is supplied to the combustion chamber 14 through the mixing chamber 15 and the flame port 16, and only secondary combustion air is constantly discharged from the annular passage 22, so no flashback from the annular passage 22 occurs.

Furthermore, during this vaporization combustion, the combustion gas from the flame port 16 is not completely premixed, so flashback is difficult to occur, and the fuel is diffused in the annular body 20, so oscillatory combustion as in centrifugal atomization is not possible. Therefore, the electromagnetic pump 2
Even if the heating capacity is adjusted by changing the discharge amount of No. 7, a good combustion state can be maintained.

FIG. 2 shows another embodiment of the present invention, in which a porous flame ring 30 made of sintered alloy is provided on the front wall surface of the dividing ring 21 in the heating liner 19 described above.

That is, an annular recess is formed in the partition ring 21 in a portion of the heating liner 19 that is closer to the inside than the heating wall 17. The flame ring 30 is provided in this annular recess. The ignition element 28 is located inside the ignition element 30 .

Note that the flame ring 30 may be constructed of a wire mesh.

With the configuration as shown in FIG. 2, when the atomized fuel impregnated in the flame ring 30 burns live, the heating wall 17 of the heating liner 19 can be effectively heated by the high temperature portion at the tip of the flame. , the rise time of combustion is shortened.

Hereinafter, since this embodiment also has substantially the same effects as the previous embodiment, the same parts in FIG. 2 as in FIG. 1 are given the same numbers, and detailed explanation thereof will be omitted.

As described in detail above, the present invention provides a burner body 10 having an annular mixing chamber 15 facing the combustion chamber 14, and connects the front part of the mixing chamber 15 to the combustion chamber 14 through the flame port 16. The rear part of the mixing chamber 15 is communicated with the air chamber 3, and an ignition fuel guide 7 and a centrifugal diffusion plate 8 are provided at the tip of a rotating shaft 6 that is mounted in the air chamber 3. An annular heating liner 19 including a heating wall 17 and a vaporization wall 18 is installed between the burner body 10 and the outer circumference of the heating liner 19 and the burner body 1.
0, the heating wall 17 of the heating liner 19 projects toward the combustion chamber 14, and the tip of the heating wall 17 is located in front of the centrifugal diffusion plate 8.
By protruding the vaporization wall 18 toward the air chamber 3 side, the vaporization wall 1
An oil-impregnated annular body 20 is provided on the outer periphery of the heating liner 19 , and a partition ring 21 is integrally formed on the inner periphery of the heating liner 19 , and between this ring 21 and the fuel guide 7 the combustion chamber 14 is
The fuel guide 7 has an annular passage 22 that communicates with the air chamber 3, and an opening 2 at the tip of an ignition oil pipe 23 on the circumferential surface of the fuel guide 7.
3a, and the tip opening 24a of the combustion oil pipe 24 is opposed to the peripheral surface of the oil-containing annular body 20, and the combustion device is constructed without providing a sheathed heater for preheating the burner body 10. Because it is a heat-resistant material, there is no need for extra electricity costs for preheating, and during vaporization combustion,
Since the air-fuel mixture is supplied to the combustion chamber only from the flame port 16, and only the secondary air for combustion flows out from the annular passage 22, no flashback phenomenon occurs.

Furthermore, during this vaporization combustion, the air-fuel mixture from the flame port 16 is not completely premixed, so backfire is difficult to occur, and since the fuel is diffused in the annular body 20, oscillatory combustion as in centrifugal atomization is performed. Therefore, even when the heating capacity is adjusted, a good combustion state can be maintained.

As shown in FIG. 2, when a porous flame ring 30 is provided on the front wall of the partition ring 21 of the heating liner 19, the heating liner 1 is heated by the high-temperature portion of the flame when the fuel is raw-combusted.
Since the heating wall 17 of No. 9 can be effectively heated,
This can speed up the start of combustion.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a combustion device according to the present invention, and FIG. 2 is a side sectional view showing another embodiment. 3... Air chamber, 6... Rotating shaft, 7...
...Fuel guide for ignition, ...Centrifugal diffuser plate,
10...Burner body, D4...Combustion chamber, 15...Mixing chamber, 16...Flame port, 17...Heating wall , 18... vaporization wall,
19... Heating liner, 20... Oil-containing annular body, 21... Division ring, 22...
・Annular passage, 23...Ignition oil pipe, 23a・
...The opening at the tip of the oil pipe 23, 24...The oil pipe for combustion, 24a...The opening at the end of the oil pipe 24.

Claims (1)

[Scope of utility model registration request] A burner body 10 having an annular mixing chamber 15 is connected to a combustion chamber 1.
4, and the front part of the mixing chamber 15 is connected to the flame port 1.
6 to the combustion chamber 14 and the rear part of the mixing chamber 15 to the air chamber 3, while an ignition fuel guide 7 and a centrifugal diffusion plate 8 are connected to the tip of the rotating shaft 6 which is mounted in the air chamber 3.
and the ignition fuel guide 7 and the burner body 10.
An annular heating liner 19 comprising a heating wall 17 and a vaporization wall 18 is installed between the burner body 10 and the outer peripheral part of the heating liner 19 is connected to the rear end of the inner peripheral surface of the burner body 10, The heating wall 17 of the heating liner 19 is protruded toward the combustion chamber 14 side, the tip of the heating wall 17 is positioned in front of the centrifugal diffusion plate 8, and the evaporation wall 18 is protruded toward the air chamber 3 side. An oil-impregnated annular body 20 is provided on the outer periphery of the vaporization wall 18, and a partition ring 2 is provided on the inner periphery of the heating liner 19.
1, an annular passage 22 for communicating the combustion chamber 14 and the air chamber 3 is formed between the ring 21 and the fuel guide 7, and an ignition oil pipe 23 is provided on the circumferential surface of the fuel guide 7. The tip opening 23a of the oil-bearing annular body 20
A combustion device characterized in that the distal end openings 24a of the combustion oil pipes 24 are opposed to the peripheral surfaces of the combustion oil pipes 24.