JPS6333045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device configured to send a vaporized or atomized liquid fuel or a mixed gas flow of gas fuel and air to a burner head and burn it there. It is.

Conventional Structures and Problems Generally, this type of combustion device is equipped with an ignition device on the combustion chamber side of the burner head, but the disadvantage is that it is difficult to ignite the mixture as it passes through the burner head at a high flow rate. Therefore, conventionally, as shown in Figures 1, 2, and 3, a mixed gas suppression fitting C was provided on the mixing chamber side of the burner head A and in a position facing the ignition device B to improve ignition performance. Ta. In other words, the flow suppressing fitting C blocks the swirling flow D of the mixed gas flow, thereby temporarily retaining the mixed gas and improving the ignitability.

However, in some cases, the ignition performance of the current suppressing metal fitting C was not sufficiently improved. In other words, since the flow suppressing fitting C is formed in a substantially L-shape, it suppresses the mixed gas in the swirling direction, but the flow velocity of the mixed gas in the axial direction flowing into the flame hole from the upper part of this substantially L-shaped portion is As a result, even with the flow suppressing metal fittings, the flow velocity does not decrease much, resulting in ignition errors.

Purpose of the Invention The present invention has been made in view of the above points, and aims to improve ignition performance by providing a suppressing effect to the flow in the axial direction at the ignition position. be.

Structure of the Invention In order to achieve the above object, the present invention is provided with a substantially L-shaped portion located with its back facing the flow in the swirling direction, and a blocking plate portion facing the flow in the axial direction. .

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a rotary vaporization type liquid fuel combustion device. In the figure, 1 is a cylindrical burner case, 2 is a burner case lid, 3 is a cylindrical combustion tube, 4 is a motor fixed to the bottom of the burner case 1 via a cushioning material 5 such as packing, and the motor shaft 6
One end enters the burner case lid 2 and connects to the combustion tube 3.
It extends to a position close to . Also burner case 1
An air intake port 7 is provided on the side. 8 is a turbo fan installed and fixed in the middle of the motor shaft 6 in the burner case 1; 10 is a blowing chamber formed by a combination of the turbo fan 8 and the guide blade 9; 11 is a blower chamber spaced from the guide blade 9 at an appropriate distance A partition plate fixed to the burner case 1, with a relatively large primary air inlet 1 in the center of which the motor shaft 6 passes through.
2, and several small secondary air intakes 13 are provided at its periphery. As a result, the traveling air that has passed through the guide vane 9 is divided into two parts, one of which passes through the primary air inlet 12 of the partition plate 11 and becomes primary air, and the other passes through the secondary air inlet 13 of the partition plate 11. It passes through and becomes secondary air. 17 is a substantially cylindrical vaporizing cylinder installed in a space on the leeward side of the partition plate 11 in the burner case 2, and a sheathed heater 18 is embedded therein. The internal space of this vaporizing cylinder 17 is a mixing chamber 19 communicating with the primary air inlet 12, and the space between the vaporizing cylinder 17 and the burner case 2 is a secondary air chamber 20 communicating with the secondary air inlet 13. There is. At the tip of the motor shaft 6 protruding into the mixing chamber 19, a conical cone 21, a disc-shaped swinging plate 22, and a stirring blade 23 having an umbrella-shaped cut-up blade are fastened with a fixing nut in the above order. It is worn. A liquid fuel supply pipe 24 supplies liquid fuel (kerosene) from a pump (not shown) to the corner of the joint between the conical cone 21 and the swinging plate 22. 25 is a carburetor cylinder 17 facing the combustion cylinder 3
The burner head is installed and fixed near the tip opening of the head body 2, as shown in Figures 5 and 6.
6. The pressure equalizing plate 27, a plurality of stacked porous flame hole plates 28, and a pressing plate 29 are stacked and bonded in the above order. The head body 26 is made of aluminum die casting or the like, and includes an outer ring part 31, a central boss part 32, a plurality of arm parts 33 connecting the outer ring part 31 and the central boss part 32, and the central boss part 32 is provided with a secondary air injection port 35 that opens toward the central axis of the combustion tube 3. This secondary air injection port 35 has a secondary air chamber 20.
A secondary air passage 36 is provided in each arm portion 33 to guide secondary air from the arm portion 33, and a secondary air passage 37 is also provided in a portion of the vaporization cylinder 17 facing the arm portion 33. Therefore, the secondary air in the secondary air chamber 20 flows through the secondary air passage 37,
36 and is discharged from the secondary air injection port 35. The pressure equalizing plate 27 has a central opening 39, and a plurality of through holes 40 are arranged in an annular manner on the outer periphery of the central opening 39. The holding plate 29 has a plurality of flame holes 41, and a cut and raised portion 43 is provided at a position facing the ignition electrode 42, forming an ignition flame hole 44 and an ignition electrode 45. Reference numeral 46 denotes a mixed gas suppressing metal fitting provided on the mixing chamber side of the burner head 25 facing the ignition electrode, and is fixed to the head body 26 with screws.

As shown in FIG. 7, this current suppressing fitting 46 opposes the substantially L-shaped portion 46a that blocks the flow of the mixed gas in the swirling direction and the pressure equalizing plate 27, and prevents the flow of the mixed gas in the axial direction. The inner surface 26a of the head body 26 and the approximately L-shaped portion 4
6a and the closing portion 46b form a space 47. Furthermore, this current suppression fitting 46
A small piece 46c is formed so as to substantially face the L-shaped portion 46a. Note that 46d is a stop portion to the head body 26.

In the above configuration, during combustion, the sheathed heater 18 is first energized to heat the vaporization tube 17. When the temperature of the vaporization tube 17 rises to a set temperature sufficient to vaporize the liquid fuel, the motor 4 is started. As the motor shaft 6 rotates, the turbo fan 8,
The cone 21, the swinging plate 22, and the stirring blade 23 also rotate. Due to the rotation of the turbo fan 8, combustion air passes through the air intake port 7 and inside the burner case 1, part of which becomes primary air that enters the mixing chamber 19 through the primary air inlet 12, and the other part of which enters the mixing chamber 19 through the secondary air inlet 13. The secondary air passes through and enters the secondary air chamber 20. on the other hand,
The fuel pump operates, liquid fuel is supplied to the swing plate 22 through the pipe 24, and the liquid fuel is supplied to the swing plate 22 through the pipe 24.
It is scattered onto the inner surface of the vaporizer cylinder at the outer peripheral end of the cylinder. At this time, since the vaporization cylinder 17 has already been heated as described above, the atomized fuel instantly vaporizes and becomes vaporized fuel. On the other hand, since primary air is sent into the vaporization cylinder 17 from the primary air inlet 12, the vaporized fuel and primary air are mixed to form a mixed gas flow. The mixed gas flow passes through the head body 26 → the large and small through holes 39 and 40 of the pressure equalizing plate 27 → the porous flame opening plate 28 → the flame holes 41 of the holding plate 29. When ignited by the ignition electrode 42, a blue flame F is generated in the burner head 25.

Here, the mixed gas in the mixing chamber 19 is swirled by the rotation of the stirring blade 23. Here, the substantially L-shaped portion 46a of the flow restraint fitting 46 acts as a resistance to the gas flow in the swirling direction, and the closing portion 46b of the flow restraint fitting 46 acts as resistance to the gas flow in the axial direction. Therefore, the flow rate of the mixed gas passing through the space 47 and behind the flow suppressing fitting 46 is lower than that of the other through hole 40.
The concentration of fuel relative to air is also higher than that at other locations. Suppressing metal fittings 46
The mixed gas that has passed through the through-holes 40a on the back side is homogenized by the porous flame hole plate 28, and since the ignition flame holes 44 of the holding plate 29 are larger, the jetting speed of the mixed gas is further reduced. Stable ignition can be achieved by high voltage discharge between the ignition electrode 42 and the counter electrode 45 of the holding plate 29.

In this embodiment, the small piece 46c provided on the flow suppressing fitting 46 suppresses the diffusion effect of the mixed gas to the other side in order to more efficiently guide the mixed gas passing through the space 47 to the ignition flame hole 44. It is something to do.

Further, FIG. 8 shows another embodiment of the present invention. In the figure, reference numeral 48 denotes a mixed gas suppressing metal fitting provided on the mixing chamber side of the burner head 25 facing the ignition electrode 42, and is fixed to the head body 26 with screws. The current suppressing fitting 48 opposes a substantially L-shaped portion 48a that blocks the mixed gas flow M in the swirling direction, and a pressure equalizing plate to block the mixed gas flow (not shown) in the axial direction. It consists of a closing part 48b.
Further, this current restraining fitting 48 has a substantially L-shaped portion 48a.
A small piece 48c is formed to face the small piece 48c, and the closing portion 48b is formed to have a notch 48e on the outer peripheral side of the head body 26 with respect to the small piece 48c. In addition, 48d is head body 2
This is a stop portion for the head body 26, which has a rotation stop portion facing the protrusion 26b provided on the head body 26.

In the above configuration, the flow suppressing fitting 48 serves as a resistance to the mixed gas flow in the swirling direction and the axial direction, reducing the flow velocity, and as shown in the figure, the mixed gas flow M in the swirling direction is prevented by the blocking portion 48b and the small piece 48c. The concentration of the mixed gas drawn into the enclosed space is made higher than that passing through the through hole 40a facing the ignition electrode 42, and the ignition time can be shortened compared to the embodiment shown in FIG.

Effects of the Invention As described above, according to the present invention, the flow rate of the mixed gas is reduced at the ignition part, the concentration is increased, and the flow is uniform, so even when the amount of excess air is large, ignition errors are avoided. In addition, since this ignition part is only a part, it does not impair the overall combustion performance. In addition, since the combustion in the ignition section is stable, even if the excess air ratio becomes slightly excessive, flame lift will not occur, and the stable combustion range can be widened, which has great effects. There is something.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of a burner head in a conventional combustion device, Fig. 2 is a bottom view thereof, Fig. 3 is a perspective view of the same flow suppressing fitting, and Fig. 4 is a cross-section of a combustion device in an embodiment of the present invention. 5 is a front sectional view of the burner head of the same device, FIG. 6 is a bottom view of the same, FIG. 7 is a perspective view of the current suppression fitting, and FIG. 8 is a perspective view of the current suppression fitting in another embodiment. It is. 3... Combustion tube, 17... Vaporization tube, 19... Mixing chamber, 25... Burner head, 26... Head body, 27... Pressure equalization plate, 28... Flame hole plate, 42...
Ignition electrode, 44... Flame hole for ignition, 46, 48...
Current suppression fittings (current suppression means).

Claims (1)

[Scope of Claims] 1. A mixing chamber for mixing fuel and combustion air, a combustion chamber communicating with the mixing chamber, a burner head that partitions the mixing chamber and the combustion chamber and has a flame hole, and The combustion chamber includes an ignition device located on the side of the combustion chamber, and a flow suppressing means provided on the mixing chamber side of the burner head at a position opposite to the ignition position, and the flow suppressing means is configured to control the direction of rotation of the mixed gas of fuel and air. A combustion device consisting of a substantially L-shaped portion positioned with its back facing the flow, and a closing plate portion facing the axial flow of mixed gas. 2. The burner head has an ignition flame hole in an area surrounded by a head body for introducing secondary air having a radial arm portion and a substantially L-shaped portion of the flow suppressing means, as set forth in claim 1. Combustion device.