JPH11166707A - Rotary burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise a holding property of flames while suppressing attachment of soot to a burner body, and to maintain temperature of the burner body at an appropriate level. SOLUTION: A primary air feed port 15 is provided substantially at the center portion of a bottom wall portion 18A. A peripheral wall portion 18B is provided with a bottomed cylindrical burner body 18 having a plurality of secondary air feed ports 17, a rotary dispersion cup 20 which is mounted on the tip portion of a rotary axis 12A which is inserted into the burner body 18 through the primary air feed port 15 so as to centrifugally disperse liquid fuel supplied from a fuel feed tube 31, and an ignition device 21 arranged at a position where fuel is dispersed from the rotary dispersion cup 20. Inside the burner body 18, there is provided a second bottomed cylindrical member 26 which is interposed in a middle position of the burner body 18 so as to form a first throttle plate 29. The second bottomed cylindrical member 26 is provided with a louvered piece 30 which turns the secondary air fed to the burner body 18 into a swirling flow, being arranged in a manner that the position thereof relative to the secondary air feed port 17 can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary burner in which liquid fuel such as kerosene supplied from a fuel supply pipe is atomized and dispersed by the centrifugal force of a rotary scatterer, and the scattered fuel is ignited and burned. It is.

[0002]

2. Description of the Related Art Conventionally, as a rotary burner of this type, for example, a rotary burner described in Japanese Patent Publication No. 56-16844 is known. This rotary burner is provided with a primary air supply port at the center of the bottom wall of a bottomed cylindrical burner body, and a plurality of secondary air supply ports on a peripheral wall portion, and into the burner body through the primary air supply port. At the tip of the inserted rotary shaft, a rotary scatterer that scatters the liquid fuel supplied from the fuel supply pipe by centrifugal force is attached, and the fine liquid fuel scattered from the rotary scatterer is ignited by an ignition device. Since it is configured to burn and does not require the heating time of the vaporizing section by an electric heater unlike a vaporizing burner, combustion can be started only by performing a short prepurge after starting operation. Things.

[0003]

However, in this case, since the secondary air from the secondary air supply port is blown out toward the center of the burner body, mixing of the flame and the secondary air is not sufficient. However, when kerosene is burned, soot is inevitably generated, and as a result, soot adheres to the peripheral wall of the burner body, the heat exchange section, and the like, which may adversely affect the burner itself, the heat exchange section, the exhaust path, and the like. was there. Also,
If the balance is slightly lost in the direction in which the air supply becomes excessive with respect to the fuel supply, the flame holding property is poor, so there is a difficulty in misfiring on the way, and it is difficult to expand the combustion control range. Met. Furthermore, in order to maintain good combustion, it is convenient if the amount of heat back to the burner main body during combustion can be secured and the burner main body can be maintained at an appropriate temperature.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a rotary burner that can increase the flame holding performance while suppressing soot sticking to the burner main body and can maintain the burner main body at an appropriate temperature. The purpose is to provide.

[0005]

According to the first aspect of the present invention, a primary air supply port is provided substantially at the center of the bottom wall portion.
A cylindrical burner body with a bottom provided with a plurality of secondary air supply ports on the peripheral wall portion, and mounted on the tip of a rotary shaft inserted into the burner body through the primary air supply port and supplied from a fuel supply pipe. A rotary scatterer that scatters liquid fuel by centrifugal force, and an igniter disposed at the fuel scatter position of the rotary scatterer, a cylindrical member with a bottom is provided in the burner body. The throttle plate is inserted at an intermediate position in the burner main body so as to form a throttle plate, and a cut-and-raised piece that makes the secondary air supplied into the burner main body a swirling flow is provided in the bottomed cylindrical member. The configuration is such that the relative position with respect to the mouth can be adjusted.

According to a second aspect of the present invention, the secondary air supply port is provided on both the upstream side and the downstream side of the throttle plate.

[0007]

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

FIG. 1 is a partially cutaway view of a combustion apparatus using an embodiment of a rotary burner according to the present invention, and FIG.
Is a cross-sectional view showing an embodiment of a rotary burner according to the present invention, FIG. 3 is an enlarged cross-sectional view showing details in the vicinity of a burner main body,
4 is a cross-sectional view taken along the line II of FIG. 3, FIG. 5 is a perspective view showing the second bottomed cylindrical member, and FIG. 6 is a cross-section showing the influence of the relative position of the cut-and-raised piece on the inflow of secondary air. FIG.

As shown in FIG. 1, a combustion apparatus A is connected to a horizontal rotary burner 2 according to the present invention, a blower 1 for supplying combustion air to the rotary burner 2, and a tip of the rotary burner 2. And a heat exchanger 3 such as a combustion tube.

As shown in FIGS. 1 and 2, the blower 1 comprises a fan case 6 integrally formed with a blower motor 4 having a variable number of revolutions and an air supply duct 5, and a plurality of air supply fans 7, 7. A large-diameter air supply port 10 as combustion air using air sucked from the air supply port 8, and a plurality of small-diameter air supply ports 11, 11 arranged in an outer periphery of the large-diameter air supply port 10 from a rotary burner. 2 can be supplied.

As shown in FIGS. 2 and 3, the rotary burner 2 has a drive motor 12 having a constant rotation speed.
And a burner case 14 coupled to the air supply duct 5 via an annular packing 13, and a primary air supply port 15 provided at the center of a bottom wall 18 </ b> A, and a plurality of secondary air A burner main body 18 made of aluminum provided with supply ports 17, 17 and housed and fixed substantially concentrically with the burner case 14 inside the burner case 14;
A rotary scatter cup 20 (rotary scatterer) attached to the tip of a rotary shaft 12A of the drive motor 12 inserted into the burner body 18 through the primary air supply port 15, and a fuel scatter position of the rotary scatter cup 20 And an ignition device 21 disposed at the same position.

The drive motor 12 is fixed to the outer surface of the air supply duct 5. The burner case 14 has a cylindrical shape with a bottom that is enlarged in two steps toward the heat exchanger 3 and has a raised portion 22 substantially at the center of the bottom wall portion 14A.
The large-diameter ventilation port 2 is provided at the center of the raised portion 22 so as to face the large-diameter air supply port 10 and the primary air supply port 15.
3 is provided, and the bottom wall portion 14 </ b> A that is closer to the outside than the raised portion 22.
Are provided with a plurality of small-diameter air vents 24, 24 facing the small-diameter air vents 11, 11, respectively.

The space between the burner main body 18 and the lower peripheral wall portion 14B of the burner case 14 is an air storage chamber X into which air from the blower 1 is fed through small-diameter vents 24,24. ing.

A first bottomed cylindrical member 25 and a second bottomed cylindrical member 26, both made of stainless steel, are fitted and inserted into the burner body 18 in the axial direction of the burner body 18. .

The first bottomed cylindrical member 25 disposed on the base side in the burner main body 18 has an annular upright wall 27 connected to the primary air supply port 15 at substantially the center of the bottom wall thereof. The first diaphragm plate 29, which will be described later,
Each of a plurality of cut-and-raised pieces (not shown) is used as a swirling flow of the secondary air ejected from a secondary air supply port (not shown) on the upstream side of the burner main body 18 along the inner surface of the peripheral wall portion 18B. It is formed facing the secondary air supply port.

The second bottomed cylindrical member 26 disposed on the tip end side in the burner main body 18 has a throttle opening 29A substantially at the center of the bottom wall thereof, and the bottom wall portion has an intermediate portion inside the burner main body 18. A first throttle plate 29 is disposed at the position, and the peripheral wall thereof has a secondary air supply port 1 downstream of the first throttle plate 29 as shown in FIGS.
A plurality of cut-and-raised pieces 30, 30 are formed facing the respective secondary air supply ports 17, so that the secondary air ejected from 7, 17 is swirled as a flow along the inner surface of the peripheral wall portion 18 </ b> B of the burner main body 18. . Further, a plurality of fixing holes 26B into which screws 47 described later are inserted are formed in the flange portion 26A of the second bottomed cylindrical member 26 in an elongated arc shape. Since the second bottomed cylindrical member 26 is rotatably inserted in the burner main body 18, the relative position of the cut-and-raised piece 30 with respect to the secondary air supply port 17 can be adjusted.

The rotary scattering cup 20 is formed in a cup shape with the primary air supply port 15 side opened, and a liquid fuel such as kerosene supplied from a fuel supply pipe 31 is supplied from a shake-off portion 20A provided at an open end side. The fine particles are scattered toward the peripheral wall portion 18B of the upstream portion in the burner main body 18. Further, the fuel supply pipe 31 is connected to a fuel tank (not shown), an oil leveler (not shown), and the like via a fuel pump (not shown) capable of supplying a variable amount of fuel.

The rotating scattering cup 20 is provided with a wire mesh 32 so as to be in contact with the inner peripheral surface of the rotating scattering cup 20. Further, the tip of the rotating scattering cup 20 has the first bottomed bottom. An air introduction cylinder 33 protruding into the annular upright wall 27 of the cylindrical member 25 is mounted. Then, the air from the primary air supply port 15 flowing into the air introduction cylinder 33 flows from a plurality of inner secondary air supply holes 35 provided on the top surface of the rotary scattering cup 20 and the top surface of the cap 34. Supplied inside the flame.

The cap 34 is made of a heat-resistant steel plate, and the rotary scatter cup 20 excluding the shake-off portion 20A is formed.
Is mounted on the distal end of the rotary shaft 12A so as to cover the outer periphery of the rotary shaft 12A with an annular space.
A is made to face A so as to further reduce the opening area of the aperture 29A.

On the stepped wall 14C of the burner case 14, an outward flange portion 40 of a tapered head member 38 having a flame port 39 formed at the tip is mounted. Between the portion 40 and the tip flange portion 18C of the burner main body 18, a central aperture 49 is provided.
The outer peripheral portion of the second diaphragm plate 49 in which A is formed and the flange portion 26A of the second bottomed cylindrical member 26 are sandwiched, and the outward flange portion 40, the second diaphragm plate 49, and the 2 Flange 26A of bottomed cylindrical member 26
Are jointly fastened to the distal end flange portion 18C of the burner main body 18 via a plurality of screws 47. Here, the aperture of the aperture 49A of the second aperture plate 49 is larger than the aperture of the flame port 39 of the head member 38, and the aperture 29 of the first aperture plate 29
It is smaller than the diameter of A.

Since the combustion device A has the above configuration, when the combustion operation is started in the combustion device A,
First, the blower 1 is driven, and by driving the blower 1,
Combustion air is supplied to the rotary burner 2 through the large-diameter air inlet 10 and the small-diameter air inlet 11. A part of the combustion air supplied to the rotary burner 2 is supplied into the burner main body 18 via the primary air supply port 15 and the remaining is supplied to the air storage chamber X via the small-diameter ventilation port 24, and thus, At the beginning of the combustion operation, pre-purge is performed for several seconds to about ten and several seconds.

When the pre-purge is completed, the drive motor 12, the fuel pump (not shown) and the ignition device 21
Are driven at substantially the same time, and liquid fuel such as kerosene is supplied from the fuel supply pipe 31 into the rotating scattered cup 20. The liquid fuel supplied to the rotating scattering cup 20 penetrates the wire mesh 32, and due to the centrifugal force of the rotating scattering cup 20,
The burner body 18 is turned into fine particles from the shaking-off section 20A.
It scatters toward the peripheral wall portion 18 </ b> B of the upstream portion inside, and mixes with the primary air from the primary air supply port 15, and is ignited by the ignition device 21 and burns. Here, the flame due to the combustion of the scattered fuel is transmitted through the throttle opening 29A of the first throttle plate 29.
Then, the gas flows through the aperture opening 49A of the second aperture plate 49 and further into the heat exchanger 3 through the flame port 39 of the head member 38.

At this time, the combustion air from the primary air supply port 15 introduced into the air introduction cylinder 33 is supplied from the inner secondary air supply holes 35, 35 as inner secondary air to the inside of the flame. The combustion air supplied to the air storage chamber X is:
The secondary air supply ports 17, 17 on the upstream and downstream sides are supplied in a swirling state to the outside of the flame as outside secondary air, and the remainder of the combustion air supplied to the air storage chamber X is supplied to the tertiary air supply. The holes 41 are supplied as tertiary air into the burner case 14 downstream of the outward flange portion 40.

At this time, the peripheral wall portion 1 is provided in the burner main body 18.
8B, a swirling flow of the outer secondary air can be generated, so that even if soot is generated during combustion, it does not adhere to the inside of the burner body 18 and the first
The bottomed cylindrical member 25, the second bottomed cylindrical member 26, and the burner main body 18 can be cooled by the swirling secondary airflow, and their durability can be increased. In addition, since the mixing property between the flame and the secondary air is improved by the swirling secondary air flow,
Not only the generation of soot and carbon monoxide can be suppressed, but also the flame holding performance in the burner main body 18 can be improved, and even if the air supply amount becomes excessive with respect to the fuel supply amount, the balance becomes small. Even if it collapses, there is no misfire on the way, and the combustion control range can be expanded.

Further, in order to maintain the burner main body 18 at an appropriate temperature, the second bottomed cylindrical member 26 is rotated in the burner main body 18 at the time of assembling the rotary burner 2 or the like, so that the secondary air of the cut and raised piece 30 is raised. By appropriately adjusting the relative position with respect to the supply port 17, the amount of heat back to the burner main body 18 can be adjusted to a desired value. That is, as shown in FIG. 6A, when the second bottomed cylindrical member 26 is positioned so that the secondary air supply port 17 is located near the base of the cut-and-raised piece 30, the secondary air supply port The secondary air spouted from 17 turns near the peripheral wall of the second bottomed cylindrical member 26 to form an air layer that suppresses heat transfer between the peripheral wall and the flame. Heat is applied to the peripheral wall of the second bottomed cylindrical member 26 and the peripheral wall 18B of the burner main body 18.
And the amount of heat back to the burner body 18 is reduced. On the other hand, as shown in FIG. 6C, when the secondary air supply port 17 is positioned so as to be located near the tip of the cut-and-raised piece 30, the secondary air supply port 1
The secondary air ejected from 7 flows in a direction away from the peripheral wall of the second bottomed cylindrical member 26, and an air layer that suppresses heat transfer between the peripheral wall and the flame is less likely to be formed.
The amount of heat of the flame transmitted to the peripheral wall of the second bottomed cylindrical member 26 and the peripheral wall 18B of the burner main body 18 increases, and the burner main body 18
The amount of heat back to increases. Further, as shown in FIG. 6B, when the position of the cut and raised piece 30 with respect to the secondary air supply port 17 is intermediate between these, the amount of heat back to the burner main body 18 also has an intermediate value. . As shown in FIG. 5, each fixing hole 26B of the second bottomed cylindrical member 26 into which the fixing screw 47 is inserted is an elongated arc shape. The position adjustment of the cut-and-raised piece 30 by the rotation of the bottom cylindrical member 26 can be performed without any trouble.

At an intermediate position in the burner main body 18,
Since the throttle plate 29 having the throttle opening 29A is provided substantially at the center, the mixture of the flame with the inner and outer secondary air when passing through the throttle opening 29A is further enhanced, and the flame is further reduced by the throttle opening 29A. Converged by passage, so that
It is possible to obtain a uniform stable flame with less deviation and variation in the circumferential direction. Further, since the secondary air supply ports 17 are provided on both the upstream side and the downstream side of the throttle plate 29, it is possible to generate the swirling secondary air flow over a wide range of the peripheral wall portion 18B of the burner main body 18. Becomes
The soot suppression range in the burner main body 18 can be expanded, and the cooling range of the first bottomed cylindrical member 25 and the second bottomed cylindrical member 26 and the burner main body 18 can be expanded.

In the above-described embodiment, a case has been described in which the cut-and-raised piece 30 of the second bottomed cylindrical member 26 can adjust the relative position with respect to the secondary air supply port 17. The cut-and-raised piece of the first bottomed cylindrical member 25 may be able to adjust the relative position with respect to the secondary air supply port, and both cut-and-raised pieces may be adjustable.

[0028]

According to the first aspect of the present invention, a bottomed cylindrical shape in which a primary air supply port is provided substantially at the center of a bottom wall and a plurality of secondary air supply ports are provided in a peripheral wall. And a rotary scatterer attached to the tip of a rotary shaft inserted into the burner main body through the primary air supply port and configured to scatter the liquid fuel supplied from the fuel supply pipe by centrifugal force. In a rotary burner provided with an ignition device disposed at a fuel scattering position, the burner body includes:
A bottomed cylindrical member is inserted at an intermediate position in the burner main body so as to form a throttle plate, and a cut-and-raised piece for turning the secondary air supplied into the burner main body into a swirling flow is provided in the bottomed cylindrical member. Is provided so that the relative position with respect to the secondary air supply port can be adjusted, so that a swirling secondary air flow along the peripheral wall in the burner body can be generated, and soot is generated. Even in this case, it is possible to prevent soot from adhering to the inside of the burner main body, to prevent the burner from being adversely affected by the adhesion of soot, and to efficiently cool the burner main body by the swirling secondary airflow, thereby improving durability. In addition, the swirling secondary air flow improves the mixing property between the flame and the secondary air, which not only suppresses the generation of soot and carbon monoxide, but also improves the flame holding property in the burner body and causes a misfire on the way. The problem is solved, and the combustion control range can be expanded. In addition, by appropriately adjusting the relative position of the cut-and-raised pieces with respect to the secondary air supply port, the amount of heat back to the burner main body can be adjusted to a desired value, so that the burner main body is maintained at an appropriate temperature. Becomes possible.

According to the second aspect of the present invention, since the secondary air supply port is provided on both the upstream side and the downstream side of the throttle plate, the above-mentioned effects are more remarkable. It will be.

[Brief description of the drawings]

FIG. 1 is a partially cut-away configuration diagram of a combustion apparatus using an embodiment of a rotary burner according to the present invention.

FIG. 2 is a sectional view showing one embodiment of a rotary burner according to the present invention.

FIG. 3 is an enlarged sectional view showing details in the vicinity of a burner main body.

FIG. 4 is a sectional view taken along line II of FIG. 3;

FIG. 5 is a perspective view showing a second bottomed cylindrical member.

FIG. 6 is a cross-sectional view showing an influence of a relative position of the cut and raised piece on an inflow amount of secondary air.

[Explanation of symbols]

 Reference Signs List 2 rotary burner 12 drive motor 12A rotating shaft 15 primary air supply port 17 secondary air supply port 18 burner main body 18A bottom wall of burner main body 18B peripheral wall of burner main body 20 rotary scattering cup (rotary flying body) 21 ignition device 25th 1 bottomed cylindrical member (bottomed cylindrical member) 26 second bottomed cylindrical member (bottomed cylindrical member) 29 first throttle plate (throttle plate) 30 cut and raised piece 31 fuel supply pipe 38 head member 49 second throttle plate ( Aperture plate)

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI F23D 11/04 631 F23D 11/04 631A

Claims (2)

[Claims] 1. A bottomed cylindrical burner body having a primary air supply port provided substantially at the center of a bottom wall and a plurality of secondary air supply ports provided on a peripheral wall, and a burner body passing through the primary air supply port. A rotary scatterer attached to the tip of a rotary shaft inserted therein and configured to scatter liquid fuel supplied from a fuel supply pipe by centrifugal force; and an ignition device disposed at a fuel scatter position of the rotary scatterer. In the rotary burner, a bottomed cylindrical member is inserted into the burner main body so as to form a diaphragm plate at an intermediate position in the burner main body, and the bottomed cylindrical member includes the inside of the burner main body. A rotary burner characterized in that cut-and-raised pieces that make the secondary air supplied to the swirl flow swirl are provided so that the relative position with respect to the secondary air supply port can be adjusted. 2. The rotary burner according to claim 1, wherein the secondary air supply ports are provided on both the upstream side and the downstream side of the throttle plate.