JPS6046329B2 - Rotary atomization burner device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary atomizing burner device used in hot air heaters and the like.

The present inventors provided a rotary cup at the back of a burner body having a bottomed cylindrical shape with an open end, and a bottomed cylindrical shape in a portion extending from the opening to the middle portion.

A burner device was developed in which a flare tube was placed with its bottom facing toward the back of the burner body, and the fuel scattered and atomized from a rotating cup was burned within the burner body (Japanese Patent Application No. 53-14).
8231, 148232). However, as a result of further various studies, it has been found that the above-mentioned burner device has the possibility of causing the following problems. That is,
In the above burner device, the flame expansion tube is formed to be relatively long along the longitudinal direction of the burner body, and steady combustion continues in an annular combustion chamber between the outer periphery of the flame expansion tube and the inner periphery of the burner body. As a result, the flare tube is heated to a considerably high temperature and becomes red-hot, and as a result of this repetition, the open end is thermally deformed and loses its roundness, resulting in partial gaps between the annular combustion chambers. There is a risk that this difference will cause an imbalance in the flow velocity of the combustion gas, leading to non-uniform combustion flame, localized yellow flame, or incomplete combustion. In addition, since the flare tube extends close to the back of the burner body and has a large heat capacity, it absorbs the combustion heat when ignited, so for a while the amount of fuel vaporized is small and the combustion gas is also low temperature. It takes a long time to start up until it reaches steady combustion, and a bad odor is generated. After transitioning to steady combustion, the flare tube becomes red hot, and the radiant heat is given to the fuel vaporization mixing section at the back of the burner body to promote fuel vaporization. When the supply amount is reduced, the combustion zone moves from the annular combustion chamber to the back of the burner body, the combustion flame heats the bottom of the flare tube, and a large amount of radiant heat is released from the bottom. However, the situation in this case is that the amount of fuel supplied is limited, so the amount of heat required for vaporization should be small, but in reality the situation goes against this, and as a result, the temperature of the vaporized gas is higher than necessary. This causes a backfire phenomenon in which the vaporized gas ignites before it can properly mix with the air, making the combustion noise louder, and heating the rotating cup to a high temperature, causing the fuel to evaporate. Atomization tends to be insufficient or non-uniform, resulting in unstable combustion conditions, so the range of thermal power adjustment has had to be set within a relatively narrow range where such phenomena do not occur. This invention was made with attention to these points, and it is a rotary atomizing burner that has a fast combustion start-up, can always achieve stable and complete combustion, and can also have a wide range of thermal power adjustment. The aim is to provide equipment.

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

In Fig. 1, reference numeral 1 denotes the body of a hot air heater. Inside this body 1, there is a burner 2 in the center, a cartridge type fuel tank 3 on one side, and a warm air fan 4 on the lower end on the other side.
is installed. The fuel tank 3 is supported by an oil pan 5, and through a valve mechanism 6, the liquid fuel such as kerosene inside is replaced with external air, so that the oil pan 5 is sequentially drained at a constant level. be. To explain the burner 2, 7 is a burner main body, which consists of an outer cylinder 8 and an inner cylinder 9.

The outer cylinder has a cylindrical shape and has flanges 10 and 11 at both ends. There is. The inner cylinder 9 has a diameter of 1.0 to 1.5 wr on the circumference! n
It has a cylindrical shape with a bottom and a flange 13 on the outer periphery of the opening. The inner cylinder 9 is inserted concentrically into the outer cylinder 8, and an air passage 14 is formed between the inner cylinder 9 and the outer cylinder 8. has been completed. Flange 10 of outer cylinder 8 and flange 13 of inner cylinder 9
means through the backing 15 and a plurality of screws 16...
It is bonded and fixed by... Reference numeral 17 denotes a combustion tube, and a flange 18 is formed at the end of the combustion tube.
are superimposed on the flange 13 of the inner cylinder 9 via the backing 19, and are joined and fixed by a plurality of screws 20.

A frame holder 21 is disposed concentrically within the inner cylinder 9 at its opening. This frame holder 2
1 is formed in the shape of a flat umbrella from a heat-resistant metal material, and has its opening side directed toward the back of the inner cylinder 9, and has mounting legs 22 radially on the other end surface. . The end of each mounting leg 22... is a flange 13 of the inner cylinder 9.
The frame holder 21 is fixed to the studs 13a protruding from the inner cylinder 9 by nuts 25 through beads 24a and 24b made of heat-resistant insulating material such as porcelain, respectively. Supported in an insulated manner. The frame holder 21 supported in this manner is further provided with a support 23a that protrudes from the opening surface side toward the inner side of the inner cylinder 9, and a support 23a that is spaced apart from the frame holder 21 is provided at the tip of the support 23a. A frame rod 23 is attached thereto. Reference numeral 26 denotes a rod terminal whose outer periphery is coated with a heat-resistant insulating material, which is provided through the flanges 10, 13 of the inner and outer cylinders 8, 9 and the backing 15 between them, and one end is connected to the end of the mounting leg 22 by a nut 28. A lead wire 29 is connected to the other end.

A lead wire 30 is connected to the screw 16 that connects and holds the flanges 10 and 13 of the inner and outer cylinders 8 and 9, and this lead wire 30 and the lead wire 29 of the rod terminal 26 are connected to the input terminal of the flame current detection circuit. There is. An annular pilot ring 31 is provided along the inner periphery of the inner cylinder 9 in the middle of the inner cylinder 9 near the opening. It is divided into two parts: the back side. Now, when the inner diameter of the inner cylinder 9 is D1, the outer circumferential diameter of the frame holder 21 is D2, and the inner circumferential diameter of the pilot ring 31 is D3, the relationship is set as follows. Also, a large number of combustion air holes 12 formed on the circumferential surface of the inner cylinder 9 are all air holes 12 on one opening side divided into two by the pilot ring 31. The number corresponding to 70 to 90% of the total area of .

A plurality of fins 31 are evenly arranged on the pilot ring 31.
a... are provided, and these fins 31a...
extends toward the inner side of the inner cylinder 9 along the longitudinal direction of its inner circumference.

A fan casing 32 is provided at the end of the burner body on the opposite side of the combustion tube 17, and a motor casing 33 is further attached so as to surround this fan casing 32.

These casings 32 and 33 have integral flanges 34 and 35 on their peripheries, and these flanges 34 and 35 are overlapped with the flange 11 of the outer cylinder 8 via a backing 36, and a plurality of screws 37... It is bonded and fixed by. The motor casing 33 has an intake hole 38 on the side.
The fan casing 32 also has an end plate 40 on its end surface, and the central part of the end plate 40 bulges out in a dish shape, and the bulged end surface meets the inner cylinder 9. It is airtightly joined to the opening 41 formed on the end surface via a backing 42, and a large number of ventilation holes 43 are evenly formed on the bulging peripheral surface, and these ventilation holes 4
3. The inside of the fan casing 37 is the burner body 7.
It communicates with the air passage 14 of. Detour fins 44 are attached radially to the inner surface of the end plate 40. Centrifugal fans 45, 45 are housed in two stages in the fan casing 37, and an output shaft 46 of the motor 39 is inserted through the center of the fan casing 37, and the fans 45, 45 are placed between the output shafts 46. is attached. The tip of the output shaft 46 passes through the end plate 40 and faces into the inner cylinder 9, and a rotary cup 47 is attached to this end. The rotary cup 47 has a cylindrical shape with a bottom, and its opening face faces the fan casing 32 side, and a plurality of openings 48 are formed on the circumferential surface by cutting and bending. The rotating cup 47 is covered with a vaporizing cup 49 attached to the end plate 40, and this vaporizing cup 49 has its opening face facing the combustion tube 17 side, and has a flange 50 on its periphery. The engagement grooves 51...
... is formed with a notch. A cover 52 is provided at the opening of the vaporizing cup 49, and has engagement claws 53 on its periphery that correspond to the engagement grooves 51. Vaporization cup 4 through...
It is attached to 9. For this installation, first each engaging claw 5
3... through each engagement groove 51... to protrude to the inner surface side of the collar 50, and in this state, cover 52
Rotate the tip edge of each engaging pawl 53 to the flange 50.
This is done by engaging the inner surface of the A plurality of dowels 54 are evenly provided on the inner surface of the cover 52, and these dowels 54 are connected to the collar 5 of the vaporizing cup 49.
0, thereby ensuring a gap 55 of about 1w0n between the recoverer 52 and the vaporizing cup 49. End plate 4
A fuel receiver 56 is provided on the inner surface of the motor 39, which has an annular shape, and a heat shielding vibe 57 is inserted into the inner periphery of the fuel receiver 56. It's inserted.

A receiving hole 58 is perpendicularly formed in the fuel receiver 56'' from its upper surface, and an oil guiding pipe 59 that communicates with the receiving hole 58 is horizontally protruded from the side surface, and the tip of this oil guiding pipe 59 rotates. This discharge vibrator 59 faces the inside of the cup 47.
A slotted groove 60 is formed at the tip of the slotted groove 60.
A guide plate 61 is loosely inserted and hangs down. One end of a discharge vibrator 62 is loosely inserted into the upper end opening of the receiving hole 58, and the other end of the discharge vibrator 62 is connected to a refueling vibrator 63 via a joint 62a.
This oil supply vibrator 63 is introduced into the oil receiving tray 5 via an electromagnetic pump 64. Reference numeral 65 denotes an ignition fuel introduction plate that is provided at an angle in the downward direction of the gap 55 of the vaporization cup 49. An ignition sheet 66 is disposed at the lower end of the inclination of this introduction plate 65, and an ignition fuel introduction plate 65 is provided directly below the ignition sheet 66. A heater 67 is provided.

Further, a drain vibe 68 is led out from directly below the vaporization cup 49, and its lead-out end is inserted into the oil pan 5. A water reservoir portion 69 is formed at the lower peripheral edge of the opening of the combustion tube 17 by bulging the edge downward, and the connection portion between the rod terminal 26 and the mounting leg 22 faces into this water reservoir portion 69. There is.

A baffle plate 70 bent into a crank shape is disposed inside the combustion tube 17, and a detour 71 for exhaust gas is formed by this baffle plate 70. A connection port 72 is provided at one end of this detour 71. ing. And the heat exchanger 7 is connected to the connection port 72.
3 is connected, and this heat exchanger 73 is connected to a meandering exhaust gas device 74.
It is connected to the outdoors through an exhaust port 75 of this exhaust gas device 74. A heat receiving port 76 is formed in the middle of the detour 71, and an evaporation container 77 is attached to the upper wall surface of the combustion tube 17 as a water storage container via a backing 78 in correspondence with the heat receiving port 76. The bottom surface is the heat receiving port 76
It faces Detour 71 directly.

A water tray 79 indicated by a chain line in FIG.
0, and a water tank 81 is detachably attached to the water tray 79. This water tank 81 allows the water inside to flow out at a constant level into the water tray 79 through a valve mechanism 82 by replacing the water with outside air. A certain level of water is always stored and maintained. The evaporation container 77 has an air inlet 83 on the side and a blowout grill 84 on the top.
It is open above the fuselage 1 through it. A guide rod 85 is provided vertically within the oil pan 5, and a float 86 is attached to the guide rod 85 so as to be vertically movable.

When the entire amount of fuel in the tank 30 flows out and the fuel level in the oil pan 5 falls, this float 86 descends together with the liquid level and its position is at the lower end of the refueling vibrator 63. The electromagnetic pump 64 is de-energized immediately before reaching the target position, thereby preventing the electromagnetic pump 64 from suctioning dry. Note that 87 is a motor that drives the hot air fan 4. Next, the effect will be explained.

By starting the motor 39, the fans 45, 45 and the rotary cup 47 rotate at high speed. As the fans 45, 45 rotate, air is sucked into the fan casing 32 from the air supply port 38, and this air further passes through the air holes 43,..., the air passage 14, and then the combustion air holes 12... ... is ejected into the inner cylinder 9. Further, the electromagnetic pump 64 supplies the fuel in the oil pan 5 to the oil receiving hole 58 through the oil supply vibrator 63 and the discharge vibrator 62, and this fuel is further supplied to the oil guide pipe 59.
The liquid drops through the slotted groove 60, along the guide plate 61, and into the rotary cup 47. The dropped fuel is dispersed and atomized into the vaporization cup 49 by the centrifugal force of rotation of the rotation cup 47. However, at this point, since the vaporization cup 49 is at a low temperature, the atomized fuel condenses again and fills the gap 5.
5 and flows down to the introduction plate 65. Then, this fuel flows through the introduction plate 65 to the side where the ignition sheet 66 is disposed, a part of it permeates into the ignition sheet 66, and the other surplus is returned into the oil receiving tray 5 through the drain vibe 68. The fuel that has permeated the ignition sheet 66 is ignited by the ignition heater 67, which is in red-hot standby in advance, to form an ignition flame on the ignition sheet 66. This ignition flame gradually intensifies and heats the vaporizing cup 49. Accordingly, the fuel in the vaporization cup 49 gradually vaporizes, and the vaporized gas uniformly flows out from the entire circumference of the gap 55. This vaporized gas is then released into the combustion air hole 1.
2. As well as mixing with the air ejected from...
The above-mentioned ignition flame is obtained and burned, and the combustion air hole 12...
It mixes with air from ... and expands its combustion. However, at this point, since the vaporization cup 49 is sufficiently heated by the radiant heat from the combustion, all of the fuel that is scattered and atomized from the rotating cup 47 is instantly vaporized and flows out from the gap 55. The combustion then shifts to steady combustion. Exhaust gas from combustion flows from the combustion tube 17 to the detour 71.
The gas flows through the exhaust gas path 74 of the heat exchanger 73, flows through the exhaust gas path 74, and is discharged outdoors from the exhaust port 75.

Further, by the rotation of the hot air fan 4, indoor air is circulated and blown so as to pass around the heat exchanger 73. When the air passes around the heat exchanger 73, it exchanges heat with the heat exchanger 73 and becomes warm air, which heats the room. There is an evaporation container 7 in the middle of the detour 71 of the combustion tube 17.
The bottom surface of 7 faces directly, so the water inside is efficiently heated by the exhaust gas and boils to generate steam. This steam is vigorously blown into the room from the blow-off grill 84 together with the air blown into the evaporation container 77 from the air inlet 83 by the rotation of the warm air fan 4, thereby appropriately humidifying the room. By the way, when the amount of fuel supplied to the rotating cup 47 is throttled and set to low heat, the vaporizing cup 49
Although the amount of vaporized gas released from the combustion chamber decreases, an amount of air commensurate with the amount of vaporized gas is supplied from each combustion air hole 12 arranged in a rough manner on the circumferential surface of the inner cylinder 9. .

Then, the vaporized gas and the air are uniformly mixed while being rectified by each fin 31a, and the pilot ring 31
A combustion flame is formed between the inner cylinder 9 and the inner cylinder 9, and this combustion flame causes the pilot ring 31 and each fin 31a...
... becomes red-hot and gives radiant heat to the fuel vaporization part to moderately accelerate its vaporization and continue combustion. The frame holder 21 is disposed at the opening of the inner cylinder 9, but no combustion flame is formed at this position when the fire power is low, so the frame holder 21 does not become red hot and hardly emits radiant heat. On the other hand, when the firepower is set to high, the amount of vaporized gas is large, so the amount of vaporized gas and the amount of supplied air do not correspond to each other in the inner part of the inner cylinder 9, and therefore a combustion flame is formed in this part. First, they are premixed by each fin 31a and become a mixed gas, and then the pilot ring 31
At the same time, each combustion chamber densely arranged on the circumferential surface of the inner tube 9 is expanded along the inner circumferential surface of the opening of the inner cylinder 9 by the opening periphery of the frame holder 21, and the flow velocity increases. A large amount of fine air is supplied from the air holes 12 at a high speed, thereby ensuring good combustion of the blue flame in this portion. The flame caused by this combustion converges along the outer surface of the umbrella-shaped frame holder 21, which causes the frame holder 21 to become red-hot, releasing radiant heat corresponding to a large amount of vaporized gas to the inner part of the inner cylinder 9, and suppressing the vaporization. promote As explained above, according to this invention,
Because the flame holder is shaped like a flat umbrella rather than a cylinder with a bottom like a conventional flame tube, it hardly experiences thermal deformation even under high temperatures, and as a result, the flame holder can be placed concentrically with the opening of the burner body for a long time. It is reliably maintained over a long period of time, and there is no risk of causing localized yellowing or incomplete combustion as in the conventional case.

In addition, since the flame holder is shaped like a flat umbrella, its heat capacity is small, so there is less heat absorption at the time of ignition, which results in a faster rise to steady combustion, which also reduces the time it takes to generate bad odors. can. When the flame holder is set to low heat, the flame holder does not become red hot, so no more radiant heat is applied to the fuel vaporization part than necessary, so there is no backfire or loud combustion noise, and this also allows for a wide range of heat power adjustment. There are advantages to being able to do so.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall cross-sectional view, Fig. 2 is a perspective view of the burner body in an exploded state, and Fig. 3 is a perspective view of the disassembled part of the rotary cup. be. 7...Burner body, 12...Combustion air hole, 21...Frame holder, 31...
...Pilot ring, 47...Rotating cup.

Claims (1)

[Scope of Claims] 1. A rotary cup for scattering and atomizing fuel is provided deep inside a bottomed cylindrical burner body with an open end, and a rotary cup is provided in the middle part of the burner body near the opening. A pilot ring along the inner circumference and a plurality of fins attached to this ring and extending to the back side along the longitudinal direction of the burner body are provided, and a flat umbrella-shaped frame holder is installed at the opening of the burner body on the opening end surface. are arranged concentrically toward the back of the burner body, and a large number of small-diameter combustion air holes are arranged on the circumferential surface of the burner body, with the pilot ring as a boundary, and the opening side is in a dense state, and the back side is in a dense state. A rotary atomizing burner device characterized in that it is formed in a coarse state. 2 The diameter of the combustion air holes is 1.0 to 1.5 mm, and the number of air holes corresponding to 70 to 90% of the total area of all air holes on the circumference of the burner body is on the opening side, and the remaining air holes are on the open side. The rotary atomizing burner device according to claim 1, wherein the rotary atomizing burner device is disposed on the back side.