JPS5913646B2 - combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves burning a mixed flow of vaporized or atomized liquid fuel or gas fuel and primary air in a burner head to create a combustion flame, and then creating a secondary combustion flame. A combustion device 1 is designed to feed air, and a gas mixture of vaporized fuel obtained by vaporizing liquid fuel and primary air from an air blower is combusted in a burner head to generate a combustion flame. This invention relates to a liquid fuel combustion device in which secondary air from a blower is sent in.

In combustion equipment, increasing combustion efficiency and widening the combustion range are among the most important issues.
This is possible by improving the shape of the combustion flame and improving its mixing with air.

Therefore, conventionally, a mixed gas flow of fuel and primary air is sent to the burner head, where it is combusted to form a combustion flame, and secondary air is sent from the outer periphery of the combustion flame toward the center of the combustion flame. In some cases, the secondary air was sent in a swirling flow, but this had the disadvantage of causing turbulence in the combustion flame and increasing combustion noise.

Since the flame has a convergence property, it is difficult to introduce secondary air to the central part of the combustion flame. Therefore, it is impossible to increase the combustion efficiency beyond a certain level using conventional methods. Also, there was a drawback that the combustion width could not be made as wide as that.

In the present invention, main secondary air is fed into the central part of the combustion flame and parallel to the combustion flame,
This auxiliary secondary air is supplied to form an auxiliary flame with good flame stability around the outer periphery.

Therefore, the flame, which tends to converge, is dispersed by the main secondary air and mixes with the air very well, and a laminar flame can be formed without causing flame turbulence, which increases combustion efficiency and improves combustion efficiency. This widens the combustion range and causes turbulence in the flame.
There is no generation of excessive combustion noise.

Furthermore, the auxiliary flame I on the outer periphery improves flame holding properties.
Extremely stable combustion becomes possible.

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 Figure I, 1 is a cylindrical motor case 12, a cylindrical burner case constructed by a first cylinder 2a and a second cylinder 2b, and 3 is a cylindrical combustion cylinder, which are shown in Figure 1. As shown, the motor case 1, burner case 2, and combustion tube 3 are connected in this order.The combustion tube 3, the second tube 2b, and the first tube 2 are connected in this order.
A are connected to each other via heat-resistant packing.

Reference numeral 4 denotes a motor installed within the motor case 1, and one end of the motor shaft 5 extends into the burner case 2 to a position close to the combustion tube 31.

An air intake port 6 is provided on the side of the motor case 4, and a plurality of communication holes 7 are provided on the periphery of the end face on the burner case side to communicate with the inside of the burner case.

Reference numeral 8 denotes a fixed turbo fan mounted in the middle of the motor shaft 5 inside the burner case 2. A guide blade 9 fixed to the burner case 2 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 21 at an appropriate interval from the guide vane 9 of the final stage, and a relatively large primary air population 12 is provided in the central part thereof through which the motor shaft 5 passes.
Several small secondary air pockets 13 are provided at its periphery.

Between the guide vane 9 at the final stage and the partition plate 11 is a flow divider chamber 14.
The blown air that has passed through the guide vane 9 at the final stage is divided into two six parts in the division chamber 14, one of which is divided into six parts by the partition plate 11.
The other air passes through the primary air population 12 of the partition plate 11 and becomes primary air, and the other passes through the secondary air population 13 of the partition plate 11 and becomes secondary air.

Reference numeral 15 denotes a substantially cylindrical vaporizing cylinder installed in a space 1 on the leeward side of the partition plate 11 in the burner case 2, and is made of a metal material 1 with good thermal conductivity such as die-cast aluminum. A sheathed heater 16 is embedded in the peripheral wall near the end.

One end of this vaporizing cylinder 15 is connected to the partition plate 1 through a heat insulating packing.
The other end is in close contact with the opening periphery of the drawn second cylinder 2b via a heat insulating packing.

The internal space of this vaporizing cylinder 15 is a vaporizing chamber 17 that communicates with the primary air population 12, and the space between the vaporizing cylinder 15 and the burner case 2 is a secondary air chamber 18 that communicates with the secondary air population 13.
It becomes.

The tip of the motor shaft 5 protruding inside the vaporization chamber 17 is
A conical cone 19, a disc-shaped swinging plate 20, and an umbrella-shaped stirring blade 21 are fastened with fixing nuts in the above order.

The cone-shaped cone 19 has a larger diameter on the tip side of the motor shaft.
It has a gentle conical shape.

The swing-off plate 20 located at the large-diameter end t of the cone 19 is made by bending the peripheral edge of a disk toward the cone side, and the bent portion of the peripheral edge is used as a smoothing part.

The stirring blade 21 is located on the tip side of the swinging plate 20.
The peripheral edge of the disc is drawn into a tapered surface, and the tapered surface is formed by cutting and raising a large number of blades. ing.

The heater 16 is located inside the peripheral wall of the vaporizing cylinder 15, which is the outer periphery of these cylinders.

22 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 1.
The cone 19 is guided slightly above the motor shaft 5 through the interior of the cone 4, where it is bent into an inverted U shape, and its tip opening is positioned above and close to the cone 19.

The outer periphery of the primary air population 12 of the partition plate 11 is the vaporization chamber 17
The inner part of the cone 19 is tapered to slightly protrude, and the primary air hole 12 in the center is located at the liquid fuel supply point of the cone 19.

23 is near the tip opening of the carburetor 15 facing the combustion tube 3.
This installation is a fixed burner head and will be explained in detail in conjunction with FIGS. 2 and 3.

The burner head 23 is connected to the head body 2 as shown in FIG.
4, pressure equalization plate 25, multiple stacked porous flame hole plates 26
, and the holding plate 27 are stacked and connected in the above order, and the current plate 28 is stacked on one side of the head body 24, which is the back surface of the burner head 23, and this state is is inserted into the vaporizer cylinder 15, and the vaporizer cylinder 15
The stepped portion 29t, which has a smaller diameter near the opening at the tip, is in contact with and bolted.

The tip side of the step portion 29 of the vaporization tube 15 becomes a heat recovery section 30 that is heated by the combustion flame FI.

The head body 24 on the side opposite to the combustion formation side is made of aluminum die-casting or the like, and includes an outer ring part 31 and a central boss part 3.
2. It is composed of a plurality of arm parts 33 that communicate between the outer ring part 31 and the central boss part 32, and a through opening 34 is formed between each arm part 33.

The central boss portion 32I is provided with a main secondary air injection port 35 that opens toward the central axis of the combustion cylinder 3.

In order to introduce secondary air from the main secondary air injection port 35) to the secondary air chamber 18, a secondary air passage 36 is provided in each arm portion 33J, and a part of the vaporization cylinder 15 facing the main secondary air passage 36 is also provided with a secondary air passage 36. An air passage 37 is provided.

Therefore, the secondary air in the secondary air chamber 18 is transferred to the secondary air passage 37.
36 and is discharged from the secondary air outlet 35.

Since a ring-shaped flange portion 38 is provided on the back side edge of the outer peripheral surface of the head body 24, when the burner head 23 is fixed in the vaporizing cylinder 15, the head body 24
A ring-shaped air pocket 39 is formed between the outer peripheral surface and the inner peripheral surface of the vaporization cylinder 15, and a plurality of radial secondary air passages from the secondary air chamber 18 to the secondary air outlet 351 are formed in the middle. This means that they communicate with each other.

The pressure equalizing plate 25 has a central boss portion 32 of the head body 24 in the center.
It has a central opening 40 that is fitted into the center opening 40 and has a slightly larger diameter than the central boss portion 32, and the outer periphery of the central opening 40 is provided with a plurality of relatively large through holes 41 arranged in an annular shape. l
This is one through hole 41 and two small through holes 4.
2 are similarly arranged in a ring shape.

The pressure equalizing plate 25 is positioned such that the portion where these large and small through holes 41 and 42 are located faces the through opening 34 of the helad body 24.

The plurality of porous flame hole plates 26 are provided with a central opening 43 in the center into which the central boss portion 32 of the head body 24 fits, and it is necessary to maintain good ventilation as a whole even when a plurality of flame hole plates 26 are stacked one on top of the other. There is.

For example, when the flame hole plate 26 is made of wire mesh, the wire meshes are stacked one on top of the other so that the meshes are perpendicular to each other, and rubbed so that good air permeability is maintained as a whole.

The presser plate 21 is attached to the central boss portion 3 of the head body 24.
2 has a central opening 44 into which the two are just fitted, and its outer periphery is defined by a partition line portion 451 extending radially from the outer peripheral edge of the central opening.
Therefore, several, for example eight, flame ports 46 are provided.

The peripheral edge of the presser plate 2γ has protrusions 47 bulging forward at appropriate intervals.

Therefore, when the presser plate 27 comes into contact with the step 291 of the air cylinder 15, a gap is created between the step 29 and the presser plate 27, and this gap is in communication with the air reservoir 39. A portion of the secondary air, that is, auxiliary secondary air, passes through the gap (hereinafter referred to as auxiliary secondary air outlet 48) and is blown out around the front surface of the burner head 23.

Note that the holding plate 27 is positioned such that each flame port 46 faces one large ventilation hole 41 and two small ventilation holes 42 of the pressure equalization plate 25.

The pressure equalizing plate 25, the porous flame outlet plate 26, and the holding plate 27 are stacked one on top of the other, and their entire peripheral edges are joined together by spot welding or caulking. After fitting, center boss part 3
The burner head 23 is assembled by pushing out the periphery of the secondary air outlet 35 of No. 2 and fixing it by caulking.

The rectifier plate 28 is shaped like a rectangular plate to create a small space between it and the head body 24, and the central part is the outer diameter of the entire through opening 34 of the head body 24 and the stirring blade 21.
It has a central opening 49 with a diameter smaller than the outer diameter of the agitating blade 21, and when installed in the vaporizer cylinder 15 together with the burner head 23, it is located on the leeward side of the stirring blade 21 and when close to it. do.

Therefore, the mixed gas flow of the vaporized fuel vaporized in the vaporization cylinder 15 and the primary air is throttled in the process of passing through the central opening 49 of the baffle plate 28, and the amount of gas passing through it is made uniform. will be further promoted.

2. In Fig. 2, numeral 50 is a thermothermo mounting part integrally formed on a part of the outer peripheral wall of the vaporizing cylinder 15, and 51 is a burner thermostat mounted in close contact with the thermos mounting part 50, which is used to control the temperature of the burner part. It is.

Reference numeral 52 shown in FIG. 1 is a temperature fuse attached to the burner case 2 facing the secondary air chamber 181.

Reference numeral 53 denotes a wind pressure switch, which communicates with the air blowing chamber 10 and the inside of the motor case 4 through pressure tubes 54 and 55, and detects whether or not air is being blown based on the pressure difference between the two.

56 is an ignition electrode that faces toward the burner head 231 from a part of the combustion tube 3.

Reference numeral 57 denotes a flame iron for combustion detection, which is attached to a part of the combustion tube 3 so as to be located in the combustion flame F in front of the burner head 23.

In the above configuration, when starting combustion, the sheathed heater 16 is first energized to heat the vaporization tube 15.

The vaporizer cylinder 15 is heated to a sufficient set temperature for the liquid fuel to vaporize.
When the temperature rises, the burner thermo 51 turns on,
Motor 4 starts.

As the morph axis 5 rotates, the turbo fan 8 and the cone 1
9. The swinging plate 20 and stirring blade 21 also rotate.

When the turbo fan 8 generates wind pressure, the combustion air passes through the air intake port 6 → the inside of the motor case 4 → the continuous follow-up hole 7 → the air blowing chamber 10, and is divided into two parts in the distribution chamber 14, one of which flows into the primary The primary air passes through the air port 12 and enters the vaporization chamber 171, and the other becomes secondary air which passes through the secondary air port 13 and enters the secondary air chamber 181.

On the other hand, after the start of air blowing is detected by the wind pressure switch 53, the fuel pump is activated and liquid fuel is supplied onto the cone 19 through the liquid fuel supply pipe 22.

Since the cone 19 has a conical shape, the liquid fuel supplied onto the cone 19 is transferred to the larger diameter side of the cone 19 due to rotational centrifugal force, and then transferred to the side of the cone 19 with a larger diameter.
The particles travel along this direction and are scattered toward the outer circumference at the outer circumferential end of the swinging plate 20.

At this time, the liquid fuel spreads as a thin film-like oil surface, but is finely divided by the stirring blade 2H rotating on the outer periphery, and becomes atomized fuel of fine particles that spreads over the inner periphery of the vaporization cylinder 15. Fly away.

Since the vaporization cylinder 15 is heated by the gas as described above, the atomized fuel is instantaneously vaporized and becomes vaporized fuel.

On the other hand, since primary air is sent into the vaporization cylinder 15 from the primary air supply 12, the vaporized fuel and primary air are mixed to form a mixed gas flow.

The mixing degree of the mixed gas flow is promoted in the process of passing through the central opening 49 of the baffle plate 28, and the through opening 34 of the head body 24
→ Large and small through holes 41, 42 of pressure equalizing plate 25 → Porous flame hole plate 2
6 → Passes through the flame port 46 of the holding plate 27.

If ignition is performed using the ignition electrode 56, a blue combustion flame F is generated in the burner head 23.

On the other hand, the secondary air sent to the secondary air chamber 18) is
5 through the secondary air passage 37 passing through the air pocket 39.
After one phase of air is stored in the main secondary air and the auxiliary secondary air, the main secondary air passes through the secondary air passage 36 of the Herad body 24 and reaches the secondary air outlet 35 in the center. It is discharged from.

The main secondary air coming out of the secondary air outlet 35 is fed into the center of the combustion flame F parallel to the combustion flame F.

Therefore, the secondary air and the combustion flame are mixed smoothly and well.

Further, the auxiliary secondary air is discharged from the auxiliary secondary jet port 47,
It is supplied to the outer circumference of the base of the combustion flame F, forming an auxiliary flame with good flame stability.

On the other hand, the combustion detection flame rod 57 detects that combustion is in progress based on the generation of combustion flame F.

In addition, the combustion flame F# heats the heat recovery section 30 of the vaporization tube 15 and the entire vaporization tube 15 is kept at a high temperature. Turn off the power to the device to save power.

In the above embodiment, the auxiliary secondary air outlet 48 was formed between the stepped portion 29 of the vaporizer cylinder 15 and the burner head 23 presser plate 27, but the presser plate 27 and the porous flame outlet plate 26 or between the porous outlet plate 26 and the helad body 2
4 may be used to create an auxiliary secondary air outlet.

In any case, an auxiliary flame with good flame stability can be formed around the outer periphery of the combustion flame by supplying auxiliary secondary air.

Based on the above-mentioned configuration, the present invention has the following effects.

(1) Although combustion flames generally tend to converge,
Since the main secondary air is fed into the center of the burning flame, the combustion flame and the secondary air are mixed well, increasing the combustion efficiency and widening the combustion range.

(2) Also, since the flow direction of the main secondary air coming out of the secondary air outlet is parallel to the direction of the combustion flame, a laminar flame is formed without disturbing the combustion flame, resulting in quiet combustion. becomes possible.

(3) In particular, in the present invention, since the auxiliary secondary air outlet is formed by a protrusion L provided on either the burner head or the stepped portion of the vaporizing cylinder, there is a space between the burner head and the stepped portion of the vaporizing cylinder. The contact is only with the above-mentioned protrusion, and the heat of the vaporizing cylinder, which has reached a high temperature due to heat recovery, is not transmitted to the burner head E and this burner head does not become high temperature.

Therefore, thermal deterioration or backfire phenomenon of the burner head is less likely to occur.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a liquid fuel combustion apparatus in Embodiment 1 of the present invention, Fig. 2 is a perspective view with a part of the vaporizing tube cut away, and Fig. 3 is an exploded perspective view of the burner head. It is. 2... Burner case, 3... Combustion tube,
5... Motor shaft, 8... Turbo fan, 10... Brewing chamber, 11... Partition plate,
12...Primary air inlet, 13...Secondary air inlet, 14...Diversion chamber, 15...
Vaporizer cylinder, 16... Sheathed heater, 17...
...Vaporization chamber, 18...Secondary air chamber, 19...
... Cone, 20 ... Swinging board, 21 ...
... Stirring blade, 22 ... Liquid fuel supply pipe, 23 ... Burner head, 24 ...
Head body, 25... Equalizing plate, 26...
... Porous flame hole plate, 27... Pressing plate, 28...
... Rectifier plate, 34 ... Through opening, 35 ...
...Main secondary air outlet, 36.37...
・Secondary air passage, 39... Air reservoir section, 41.
...large through hole, 42...small through hole, 46...flame port, 48...auxiliary secondary air outlet.

Claims (1)

[Claims] 1. A vaporizer cylinder with a heat recovery section provided on one end opening side through a step, and a burner head disposed in contact with the step l of the vaporizer cylinder, the burner head t is the burner head f.
The central part of the combustion flame formed is parallel to this combustion flame.
In addition to providing a main secondary air outlet for sending out the main secondary air, a protrusion is provided between the burner head and the stepped portion of the vaporizing cylinder on either the burner head or the stepped portion. Therefore, an auxiliary secondary air outlet for flame stabilization is provided on the outer periphery of the base of the combustion flame to send out auxiliary secondary air, and an air pocket to be blown is provided on the outer periphery of the burner head. (When this is provided, this air pocket and the main secondary air outlet are opposite to the combustion flame forming side of the burner head. .