JPS5937525Y2 - liquid fuel vaporization burner - Google Patents

Description

[Detailed description of the invention] This invention is a liquid fuel vaporizing burner that vaporizes and burns liquid fuel (mainly kerosene), and in particular, includes a burner body having a combustion chamber, and a blowing chamber in which a blower is disposed. The burner body is provided with a gas chamber that is a cylindrical body that communicates with the ventilation chamber and has a plurality of blowholes on its inner surface, and a vaporization cylinder that communicates with the gas chamber. A liquid fuel vaporization burner (
The present invention relates to an improvement of a burner (hereinafter simply referred to as a "burner").

In this type of burner, liquid fuel such as kerosene (hereinafter simply referred to as "kerosene") supplied to the vaporizer is jetted from the vaporizer into the combustion chamber and atomized, and the atomized kerosene is
The igniter's discharge spark ignites and causes live combustion, which heats the vaporization cylinder, vaporizes the kerosene in the vaporization cylinder, forms an air-fuel mixture, and sends it to the gas chamber. The fuel is injected into the combustion chamber through the gas cylinder, where it is combusted, and combustion continues.

In this way, at the time of ignition, kerosene is injected from the carburetor into the combustion chamber, atomized and combusted in a live combustion state, so it is supplied to the carburetor in a state that is easily atomized. is forcibly rotated by a motor or wind action, and the supplied kerosene is deposited in a thin film on the inner wall of the vaporizer cylinder and flows down into the combustion chamber, or the kerosene is sprayed in the form of a mist onto the inner wall of a fixed vaporizer cylinder, or A whirlwind is sent into the vaporization cylinder, and the kerosene is dispersed by this whirlwind action, sprayed onto the inner wall of the vaporization cylinder in a thin film, and then ejected into the combustion chamber, where the kerosene is atomized and burnt live. .

After ignition, the vaporizing cylinder is heated by raw combustion as described above, and the kerosene attached to the inner wall of the vaporizing cylinder in a thin film is vaporized, and the kerosene is transferred from the ventilation chamber into the vaporizing cylinder through the ventilation guide cylinder. It mixes with the incoming air, becomes an air-fuel mixture, is sent to the gas chamber, and is injected into the combustion chamber through a plurality of blowholes provided on the inner surface of the gas chamber, where it is combusted. Since all of the holes have the same diameter, the air-fuel mixture flows more easily to the upstream fumaroles on the back side where there is less fluid resistance, and the amount of air-fuel mixture ejected from the fumarole holes on the back side and the tip side is smaller. Since a large amount of air-fuel mixture is ejected from the deep nozzle hole, the ejection speed is high and the combustion flame becomes unstable, making it easy to lift.

On the other hand, in the nozzle hole portion on the tip side, the amount of air-fuel mixture ejected is small and the ejection speed is slow, resulting in incomplete combustion.

Therefore, this idea was devised in view of the above points, and it changes the hole diameter of the fumarole provided on the inner surface of the gas chamber, so that the hole diameter of the fumarole on the inner side is different from that of the fumarole on the tip side. To provide a burner which is formed to have a diameter smaller than the hole diameter so that the amount of air-fuel mixture ejected from the entire nozzle hole is uniform, and which prevents poor combustion phenomena such as lifting and red flame combustion from occurring. This is the purpose.

Next, this invention will be explained in detail with reference to an illustrated embodiment.

FIG. 1 schematically shows the overall structure of a burner embodying this invention, with reference numeral 1 indicating a burner main body, 2 a blowing chamber having a blowing mechanism, and 3 a blowing guide cylinder.

The burner main body 1 includes a gas chamber 4 and a combustion chamber 5 surrounded by the gas chamber 4, as shown in FIG.

The gas chamber 4 is composed of a cylindrical body with a double wall structure, and a bell-shaped or umbrella-shaped vaporizing cylinder 6 is disposed coaxially with the gas chamber 4 in a combustion chamber 5 surrounded by the gas chamber 4. ing.

The vaporizing cylinder 6 is rotatably supported by a rotating shaft 61 coaxial with the drive shaft of the motor 22, and the tip 61a of the rotating shaft 61 protrudes outward from the top 62 of the vaporizing cylinder 6. 61b1 It is fixed via a washer 61c or the like.

A tapered fuel diffuser 63 is fitted onto the shaft portion 61d of the rotating shaft 61 and fixed on the inner side of the top portion 62 of the vaporization cylinder 6. As the rotating shaft 61 rotates, the fuel diffuser 63 is connected to the fuel diffuser 63. The vaporizer cylinder 6 is red and appears to rotate.

A nozzle 71 of a tubular oil passage 7 for supplying kerosene as liquid fuel is close to the fuel diffuser 63 provided inside the top 62 of the vaporization tube 6 , and the open end of the vaporization tube 6 A blower guide tube 3 extending from the blower chamber 2 is connected to.

Then, the air blown by the air blowing fan 21 is supplied from the air blowing chamber 2 to the inside of the vaporizing tube 6 via the air blowing guide tube 3 .

23 is an air intake port.

While the burner body 1 and the air blowing chamber 2 are made of large-diameter cylindrical bodies, the blower guide tube 3 is made of a slender truncated conical body that is narrower than the diameter of both of them. Space is secured on the outer periphery to attach an igniter and frame rod, which will be described later.

The inside of the vaporization cylinder 6 communicates with the gas chamber 4 via a mixture passage 64 for the air-fuel mixture.

An annular body 66 is fixed to the end edge 65 of the vaporizing cylinder 6 with a gap 67 left, and as will be described later, this gap 67
Kerosene (thin film) adheres to the inner wall 68 of the vaporizer cylinder 6 through the kerosene.

) is ejected into the combustion chamber 5, atomized, and ignited.

Note that a fine wire mesh or the like may be attached to the inner wall 68.

The gas chamber 4 communicating with the vaporization cylinder 6 is a cylindrical body with a double wall structure as described above, and is in contact with the mixing passage 64 on the upstream side, and is formed in a cross-sectional shape, and has a tapered shape facing the vaporization cylinder 6. A plurality of fumarole holes 42 are bored in the inner wall 41 (inner surface of the gas chamber) over almost the entire wall surface.

Among these fumaroles 42, those provided on the inner side,
The hole diameter is different from the one provided on the tip side,
As shown in the figure, the hole diameter of the fumarole hole 42A on the deep side is smaller than that of the fumarole hole 42B on the tip side (for example, about 1:
1.2).

Therefore, the fumarole hole 42A is close to the vaporization tube 6 and is located on the upstream side of the flow of the air-fuel mixture, and the fumarole hole 42B is located away from the vaporization tube and on the downstream side, so that the flow of the air-fuel mixture Even if the flow is concentrated toward the fumarole hole 42A, the diameter of the fumarole hole 42A is smaller than that of the fumarole hole 42B, and the amount of air-fuel mixture ejected is throttled, so the amount of air-fuel mixture between the fumarole hole 42A and the fumarole hole 42B is reduced. The injection velocity is made more or less uniform, the mixture is ejected in an appropriate amount from each nozzle hole, and the mixture is combusted in a stable state, without causing incomplete combustion phenomena such as lifting or red flame combustion.

As mentioned above, the fumaroles having different hole diameters are located on the inner wall 4 of the gas chamber 4.
10 They are provided in multiple rows along the circumferential direction,
Considering that the inner wall is tapered, the interval P1 between the fumaroles arranged in the row on the tip side is wider than the interval Pn between the fumaroles arranged in the row on the deep side.
), so that the fumarole holes are evenly distributed over the entire inner wall.

The diameter of the fumarole can be changed sequentially and sequentially from the inner part to the tip side in each row (from a small hole diameter to a large hole diameter), or it can be changed stepwise or discontinuously, for example in the deep part. It may be divided into a section, a middle section, and a tip section, and the hole diameters of several rows of blowholes in each section may be changed to small, medium, and large.

One or more air shorting holes 32 are provided in the side wall 31 of the ventilation guide tube 3 to which the side wall 43 facing the ventilation guide tube 3 is connected.
passes through the gas chamber 4, so that the air is branched from the air blowing chamber 2 and flows directly from the air blowing guide tube 3 into the gas chamber 4.

Note that the diameter of the air short circuit hole is appropriately set depending on the capacity of the burner.

The outer side 44 of the gas chamber 4 is curved in an L shape with respect to the side wall 43, and the curved inner wall 4 is connected to the edge 41a of the inner wall 41.
A constricted portion 46 recessed inward is formed at a position facing 5.

The constricted portion 46 is provided in a wound manner along the outer periphery of the gas chamber 4, and the interior of the gas chamber 4 is partitioned by the constricted portion.

Therefore, the air-fuel mixture that has flowed into the gas chamber section 4A on the upstream side of the gas chamber 46 will not reach the blowhole 42 of the gas chamber section 4B on the downstream side unless it passes through the throttle section 46.
Due to the resistance, the upstream gas chamber section 4A stirs well.
After being mixed, the mixture flows to the gas chamber portion 4B on the downstream side, so that the air-fuel mixture ejected from the blowhole 42 burns in a good red state.

An ignitor I is installed in the combustion chamber 5 between the gas chamber 4 and the carburetor cylinder 6.
g protrudes through the gas chamber 4, and k is provided so as to ignite the air-fuel mixture injected into the combustion chamber 5 (discharge ignition).

The discharge of the igniter Ig is directed toward the inner wall 41 of the gas chamber 4, so that sparks strike the ignition ring 47 protruding from the edge 41a of the inner wall 41.

The ignition ring 47 has the end edge 41a bent into a substantially L shape and protrudes toward the combustion chamber 5. The ignition ring 47 is wound around the inside of the combustion chamber and is integral with the inner wall 41.
a protrudes inward from the surface of the inner wall 41 and is in surface contact with the curved inner wall 45.

Although not shown, the portion of the ignition ring that faces the igniter may protrude like a tongue (toward the igniter).

The igniter Ig is a commonly used one,
It penetrates the gas chamber 4 together with the flame rond FL, and the combustion chamber 5
The ignition ring 47 protrudes from the ignition ring 47 and is arranged with an appropriate discharge gap therebetween, and these are attached from the side of the blower guide cylinder 3.

To attach the burner to the water heater, it is sufficient to attach it to the hot water outlet of the water heater via the mounting plate 8, and necessary equipment such as burner control equipment can be attached to the mounting plate 8.

Next, the ignition and combustion operations will be explained. When igniting, the motor 22 is started to be driven and kerosene is pumped through the oil supply path.

Due to the high-speed rotation of the rotating shaft driven by the motor 22, the fuel diffuser 63 and the vaporizer cylinder 6 rotate at high speed, and kerosene is dripped from the nozzle 71 of the oil feed path 7 toward the rotating fuel diffuser 63. When supplied, the kerosene is diffused toward the inner wall 68 of the vaporization tube 6 due to the high speed rotation of the fuel diffuser 63, adheres to the inner wall in a thin film state, flows toward the edge 65 due to centrifugal force, and flows toward the edge 65. The fuel reaches the combustion chamber 5 through the gap 67, becomes atomized, is ignited by the spark of the igniter, and burns live.

This raw combustion heats the vaporization cylinder 6, vaporizes the kerosene in the vaporization cylinder, mixes it with the blown air, and generates an ignitable air-fuel mixture. 4, and is ejected from the nozzle hole 42 of the inner wall 41 of the gas chamber 4 to the combustion chamber 5 (at this time, the air-fuel mixture is sent to the nozzle hole 42A with a different hole diameter.

42B) and is ignited by the raw combustion flame, thus the combustion shifts from raw combustion to combustion by the air-fuel mixture and continues combustion in a stable state.

As mentioned above, according to this invention, the hole diameters of the fumarole holes provided on the inner surface of the gas chamber are different between those on the inner side and those on the tip side, and the hole diameter of the fumarole holes on the inner side is different. Since the diameter of the fumarole is smaller than that of the fumarole on the tip side, the air-fuel mixture that tends to flow to the fumarole on the back side will also flow to the fumarole on the tip side by restricting the hole diameter of the fumarole on the back side. This makes it easier for the air-fuel mixture to be ejected uniformly from all the blowholes.

Therefore, it is possible to prevent poor combustion phenomena such as lifting and red flame combustion that occur partially on the inner surface of the gas chamber due to differences in the amount of air-fuel mixture ejected, and to obtain a burner that can burn the air-fuel mixture in a stable and complete combustion state. I can do it.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, and FIG.
FIG. 2, a side view showing the overall structure, is an explanatory diagram showing a developed state of the installation of the blowholes provided on the inner surface of the gas chamber. 1...Burner body, 2...Blower chamber, 4
...gas chamber, 41...inner wall of the gas chamber (
inner surface), 42... fumarole, 42A...
Fumarole on the back side, 42B... Fumarole on the tip side,
5... combustion chamber, 6... carburetor tube.

Claims (1)

[Scope of utility model registration request] The burner body includes a burner body having a combustion chamber, and a blowing chamber in which a blower is disposed, and the burner body is made of a cylindrical body communicating with the blowing chamber, and has a plurality of jets on the inner surface facing the combustion chamber. A liquid fuel vaporizing burner is provided with a gas chamber provided with a hole, a vaporizing cylinder communicating with the gas chamber, and an oil feed passage for supplying liquid fuel in the vaporizing cylinder. A liquid fuel characterized in that among a plurality of fumarole holes provided on the inner surface of a chamber, the diameter of the fumarole hole provided on the inner side is smaller than the hole diameter of the fumarole hole provided on the tip side. vaporizing burner.