JPS6023246B2 - combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device configured to send a vaporized or atomized liquid fuel or a mixed gas flow of gaseous fuel and air to a burner head and burn it there. This is for the purpose of uniformity.

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

FIG. 1 shows a rotary vaporization type liquid fuel combustion device.

In the figure, 1 is a cylindrical burner case, 2 is a burner case lid that also serves to fix the burner, and 3 is a cylindrical combustion tube. The cylinders 3 are connected in this order, and the combustion cylinder 3
, burner case lid 2, and burner case 1 are connected to each other via heat-resistant packing. Reference numeral 4 denotes a motor fixed to the lower part of the burner case 1 via a cushioning material 5 such as packing, and one end of the motor shaft 6 protrudes into the burner case 1 and extends to a position close to the combustion tube 3.

Further, an air intake port 7 is provided on the side of the burner case 1. Reference numeral 8 denotes a turbo fan installed and fixed in the middle of the motor shaft 6 in the burner case 1. The turbo fans 8 are provided in multiple stages, two stages in the figure, and the discharge side of each turbo fan 8 is provided with a turbo fan in the burner case 1. A fixed guide vane 9 is provided.

A blowing chamber 10 is configured by a combination of a turbo fan 8 and a guide blade 9, and static pressure can be increased by increasing the number of stages in the combination. Reference numeral 11 denotes a partition plate fixed to the burner case 1 at an appropriate distance from the final stage guide vane 9. A relatively large primary air inlet 12 through which the motor shaft 6 passes is provided in the center of the partition plate, and a small primary air inlet 12 is provided at the periphery of the partition plate. In addition to providing several secondary air intake ports 13, a plurality of protruding fixed feet 15 are provided at the peripheral edge of the partition plate 11 with appropriate gaps 14, and here the burner case 1 is fixed.

Between the guide vane 9 at the final stage and the partition plate 11 is a diversion chamber 18.
The blown air that has passed through the guide vane 9 at the final stage is divided into two parts in the branch chamber 16, one of which is separated by the partition plate 11.
The other air 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 and becomes secondary air. Reference numeral 17 denotes a substantially cylindrical vaporizing cylinder installed in a space on the leeward side of the partition plate 11 in the burner case 2, and is made of a metal material with good thermal conductivity such as die-cast aluminum. A sheathed heater 18 is embedded in the peripheral wall near the end.

One end of this vaporizer cylinder 17 is connected to the crosscut plate 1 through a heat insulating packing.
1, and the end of the pond is drawn and attached to the burner case lid 2.
It is in close contact with the periphery of the gate via a heat insulating packing. The internal space of this vaporizing cylinder 17 is a vaporizing chamber 19 that communicates with the primary air inlet 12, and the space between the vaporizing cylinder 17 and the burner case lid 2 is a secondary air chamber 20 that communicates with the secondary air inlet 13.
It becomes. At the tip of the motor shaft 6 protruding into the vaporization chamber 19, a cone-shaped cone 21, a disc-shaped swinging plate 22, and a lamp blade 23 having an umbrella-shaped cutting and raising blade are attached with a fixing nut as described above. It has been terminated. The cone-shaped cone 21 has a large flea on the tip end side of the motor shaft. It has a gentle conical shape. Further, the fly azusa blade 23 located on the tip side of the swinging plate 20 is provided with a raised blade such that a part of the flat surface of the disk becomes a tapered surface, and is the tapered cut-raised blade, It surrounds the outer periphery of the swinging plate 22. The heater 18 is located in the peripheral wall of the vaporizing cylinder 17, which is the outer periphery of these cylinders. 2
4 is a liquid fuel supply pipe through which liquid fuel (kerosene) from a pump (not shown) passes, and is connected to the flow branch chamber 16.
It is guided slightly above the mower shaft 6 through the inside, and there it is bent into an inverted U-shape, and its tip end is positioned close to the corner of the joint between the conical cone 21 and the swing-off plate 22. .

The outer periphery of the primary air inlet 12 of the partition plate 11 is connected to the vaporization chamber 19.
It is tapered so that it protrudes slightly inward. Reference numeral 25 denotes a burner head which is fixedly attached near the tip end of the vaporizer cylinder 17 facing the combustion cylinder 3, and will be explained in detail with reference to FIGS. 2 to 5.

The burner head 25 has a head body 26 as shown in FIG.
, pressure equalization plate 27 ``multiple stacked porous flame hole plates 28,
The holding plate 29 is stacked and joined together in the above order, and in this state it is inserted into the vaporizing cylinder 17 and bolted to the inner surface of the vaporizing cylinder 17.

The tip of the vaporization tube 17 becomes a heat recovery section 30 heated by the combustion flame F. The head body 26 is made of aluminum die-casting or the like, and includes an outer ring part 31, a central post part 32, an outer ring part 32, and a plurality of arm parts 33 connecting the outer ring part 31 and the central boss part 32. Part 3
There is a through gate 34 between the three. The central boss portion 32 is provided with a secondary air injection port 35 which is directed toward the central axis of the combustion tube 3. In order to introduce secondary air from the secondary air chamber 20 to this secondary air injection port 35, each arm portion 3
3 is provided with a secondary air passage 36, and the vaporization cylinder 1 facing it is provided with a secondary air passage 36.
7 is also provided with a secondary air passage 37. Therefore, the secondary air in the secondary air chamber 20 passes through the secondary air passages 37 and 36 and is discharged from the secondary air outlet 35. Since a ring-shaped flange portion 36 is provided on the green end of the back side of the outer circumferential surface of the head body 26, when the burner head 25 is fixed in the vaporizing tube 17, the outer circumferential surface of the head body 26 and the vaporizing tube 17
A ring-shaped air pocket 39 is formed between the inner peripheral surface and the inner peripheral surface.
A plurality of secondary air passages from the secondary air chamber 20 to the secondary air outlet 35 pass through each other midway. The boundary pressure plate 27 has a central boss 32 of the head body 26 in the center thereof, and has a central entrance 40 with a slightly larger diameter than the central boss 32, and has a plurality of relatively large through holes 41 on its outer periphery. They are arranged in a ring shape, and a plurality of small through holes 42 are also arranged in a ring shape for each through hole 41 on the outer peripheral side thereof. The small through hole 42 of this pressure equalizing plate 17 further consists of a large through hole 42a and a small through hole 42b, and the ventilation opening area of the large through hole 42a is the same as that of the small through hole 42b.
be larger than that of As shown in FIG.
The small through hole 42b is arranged so as to be located on the upstream side B. On the other hand, a plurality of porous flame hole plates 2
8 is provided with a central entrance 43 in the center where the central boss portion 32 of the head body 26 just fits together, and it is necessary to maintain good ventilation as a whole even when a plurality of sheets are stacked one on top of the other. For example, when the flame hole plate 28 is made of wire mesh, the wire meshes are stacked one after another at an appropriate angle (for example, 45 degrees) so that the meshes do not intersect at right angles to maintain good ventilation as a whole. The presser plate 29 has a central boss portion 3 of the head body 26 in the center.
2 has a central closing opening 44 that just irons together, and on its outer periphery,
Several, for example, eight, fire vents 46 are provided, separated by dividing lines 45 extending radially from the central opening □ surrounding green, and the fire vents 4 are separated.
A rising green 47 that protrudes forward is formed on the surrounding green of No. 6. The holding plate 29 is positioned such that each flame port 46 faces one large ventilation hole 41 and a plurality of small ventilation holes 42 of the pressure equalization plate 27. pressure equalization plate 27, porous flame hole plate 28,
The presser plates 29 are stacked one after another and their entire peripheral edges are joined by spot welding or caulking to integrate them, and their central openings are fitted to the central boss portion 32 of the head body 26 to connect the secondary air of the central boss portion 32. The burner head 26 is assembled by pushing out the green around the spout 35 and fixing it by caulking. In addition, numeral 49 shown in FIG. 2 is a thermo mounting part integrally formed on a part of the outer peripheral wall of the vaporizing cylinder 17, and numeral 50 is a burner thermostat mounted in close contact with the thermo mounting part 49, which is used to control the temperature of the burner part. It is.

In the above configuration, at the start of combustion, the sheathed heater 8 is first energized to heat the vaporization cylinder 17. When the temperature of the vaporizer cylinder 17 rises to the set temperature sufficient to vaporize the liquid fuel, the burner thermometer 50 is turned on and the motor 4 is turned on.
starts. As the motor shaft 6 rotates, the turbo fan 8
, the cone 21, the swinging plate 22, and the hawk blade 23 also rotate. When the turbo fan 8 generates wind pressure, the combustion air passes through the air intake port 8 → inside the burner case 1 → the blowing chamber 10,
The flow is divided into two parts in the diversion chamber 16, one being the primary air that enters the vaporization chamber 19 through the primary air inlet 12, and the other being the secondary air that enters the secondary air chamber 2 through the secondary air inlet 13. Become. On the other hand, the fuel pump is activated, and the liquid fuel passes through the liquid fuel supply pipe 24 and is connected to the swinging plate 22, and is scattered toward the outer circumference at the outer peripheral end of the swinging plate 22. At this time, the liquid fuel spreads as a thin film-like oil surface, but is finely divided by the tapered cut-and-raised blades of the pseudo guide blades 23 rotating on its outer periphery, and becomes fine particle atomized fuel into the vaporizer cylinder 17. It flies towards the inner circumferential surface of. 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 swirls through the opening 34 of the head body 24.
→ Large and small through holes 40, 41, 42 of pressure equalizing plate 27 → Porous flame hole plate 28 → Passes through flame port 46 of presser plate 29. When ignited by the ignition electrode 56, a blue combustion flame F is generated in the burner head 25. Here, when looking at the flow of the mixed gas in the through hole 34 of the head body 26 having a plurality of arm parts 33, when the rotation direction of the turbo fan 8 is, for example, leftward, the downstream A side of the head body arm part 33 is penetrated. At the Sekiguchi, the flow of the mixed gas is blocked by the head-body arm portion 33, and the wind pressure becomes relatively 4.1.

On the other hand, when the upstream B side through hole is closed, the wind pressure tends to be relatively large. Since the hole 42b' is made small, even if there is a difference in wind pressure due to the presence of the head body arm portion 33, the ejection amount can be adjusted to be almost constant with the amount of mixed gas passing through the through holes 42a and 42b. Therefore, the flame length becomes uniform and stable with no variation.The secondary air sent to the two secondary air chambers passes through the secondary air passage 37 of the vaporization cylinder 17, and is unified in the air reservoir 39. After being stored, the air passes through the secondary air flow path 36 of the head body 26 and is discharged from the central secondary air outlet 35.

The secondary air coming out of the secondary air outlet 35 is sent into the center of the combustion flame F in parallel with the combustion flame F. Therefore, the secondary air and the combustion flame are mixed smoothly and well. The combustion detection flame rod 57 detects that combustion is in progress by generating combustion flame F. In addition, the combustion flame F heats the heat recovery section 30 of the vaporization tube 17, and the entire vaporization tube 17 is kept at a high temperature, so that the flame. After an appropriate period of time has elapsed after combustion is detected by the head 57, the power supply to the sheathed heater 18 is stopped to save power. As described above, according to the present invention, the length of the flame formed in the burner head is almost uniform and stable on the same circumference, and the combustion performance is stabilized, and flame detection by the flame rod etc. is also simple and accurate. The effects are great, such as being able to do more.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a liquid fuel combustion device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a part of the vaporizer cylinder with a cutaway, and FIG. 3 is an exploded perspective view of the burner head. FIG. 4 is an explanatory view showing the relationship between the head body and the lagoon pressure plate, and FIG. 5 is a sectional view showing the combustion state. 8...Turbofan, 25...Bernahed, 26...
・・Head body, 27・・・Pressure equalization plate, . 28...
... Porous flame hole plate, 29... Pressing plate, 42...
...Through hole for ventilation gate. Figure 1 Figure 2 Figure 4 Figure 3 Figure 5

Claims (1)

[Claims] 1 Head body with radial arm portion, pressure equalizing plate,
A burner head is provided in which porous flame hole plates are stacked one on top of the other, and the swirling mixed gas flow of fuel and air sent from the head body side is burned in the porous flame hole plates, and a plurality of through holes are provided on the outer periphery of the pressure equalizing plate. The holes are arranged close to the head body arm, and the ventilation opening area of the through hole on the downstream side with respect to the swirling direction of the mixed gas centered on the head body arm, and the ventilation opening area of the through hole on the upstream side. Larger combustion device.