JPS5832289B2 - Combustion control device in vaporizing burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a combustion cylinder in which a gas chamber is formed between an outer cylinder and an inner cylinder having a large number of flame holes, and a rotary vaporizer cylinder whose inside is communicated with the gas chamber. Immediately after the burner starts to ignite and transitions to the degasification combustion state, The present invention relates to a combustion control device for preventing unstable combustion, such as flames rising from a flame hole or partially extinguishing.

This type of burner ignites the fuel material that is sprayed into the combustion cylinder from the open end of the rotary vaporization cylinder to cause live combustion, and heats the rotary vaporization cylinder with the heat of combustion. This method generates evaporated gas, and vaporizes and burns the gas when it is fed into the gas chamber on the inner periphery of the combustion cylinder and ejected into the combustion cylinder from the nozzle hole. Immediately after transitioning to a combustion state, there are many cases in which combustion becomes unstable, with the flame rising up from the nozzle or partially extinguishing.

By the way, the above-mentioned phenomenon occurs due to the following reasons.

In other words, immediately after the burner transitions from the live combustion state to the vaporization combustion state, the combustion cylinder is still cold, so when the vaporized gas generated in the rotary vaporization cylinder is sent to the gas chamber,
Part of it cools and liquefies and accumulates on the bottom wall of the gas chamber, so even if a predetermined amount of fuel is supplied into the rotary vaporization cylinder, the amount of vaporized gas ejected from the flame hole will decrease by the amount that is partially liquefied. This is because the amount of combustion air relative to the amount of fuel burned becomes temporarily excessive.

In view of the above, the present invention provides a temperature-sensitive switch on the outer wall of the combustion cylinder that operates when the burner reaches a certain temperature after ignition, as well as a combustion air increasing valve and a supply fuel increasing valve for blowing air into the rotary vaporizing cylinder. Therefore, until the temperature of the combustion tube rises above the temperature at which the vaporized gas does not liquefy, both the amount of combustion air sent to the rotary vaporization tube and the amount of fuel supplied are increased, thereby temporarily reducing the amount of combustion after the burner is ignited. In many cases, the combustion tube is heated to a sufficiently high temperature during the transition from the raw combustion state to the vaporization combustion state, and immediately after the transition to vaporization combustion, the flame rises or disappears due to partial liquefaction of the vaporized gas. The present invention is intended to provide a combustion control device for a vaporizing burner that can eliminate the above phenomenon and stabilize combustion. do.

In FIG. 1, 1 is a combustion tube, and the combustion tube 1 is composed of an outer tube 2 and an inner tube 3, and a gas chamber 4 is formed between the outer tube 2 and the inner tube 3. A large number of flame holes 5 are bored on the surface of the inner cylinder 3.

Reference numeral 6 denotes a rotary carburetor cylinder, which is attached to the tip of a rotating shaft 7 inserted into the combustion cylinder 1 from the bottom wall side thereof, and the inside of the rotary carburetor cylinder 6 is communicated with the gas chamber 4. ing.

Further, a blower tube 9 connected to the blower chamber 8 adjacent to the bottom wall side of the combustion tube 1 is deeply inserted into the rotary carburetor tube 6, and between the blower tube 9 and the rotary carburetor tube 6. An air mixture passage 10 is formed.

An inverted conical fuel scattering body 11 is fixed to the inner part of the rotary vaporizing cylinder 6, and the tip of a fuel supply pipe 12 is exposed at a position close to the fuel scattering body 11.

13 is a fuel spray gap opened from the open end of the rotary carburetor 6 into the combustion tube 1; 14 is a fume chamber communicating with the blowing chamber 8; and 15 is a fuel spray gap communicating with the combustion tube 1 from the blow chamber 14. It is a fumarole.

A temperature-sensitive switch 16 is attached to the outer wall of the combustion tube 1, and this temperature-sensing switch 16 is activated when the combustion tube 1 rises to a predetermined temperature (in the illustrated example, it is normally closed). It has a contact that opens when temperature sensing is activated.

). 17 is a spark plug. The air blowing chamber 8 is connected to the air blowing side of a forced air blower (not shown), and a combustion air increasing valve 1 as shown in FIGS. 2 and 3 is installed in the air passage.
8 is interposed.

That is, the combustion air increase valve 18 has a forced air flow population 19.
It has a structure in which an electromagnetic solenoid 22 moves up and down a valve body 21 that changes the opening degree of the passage between the forced air outlet 20 and the forced air outlet 20 in two ways, wide and narrow.When the electromagnetic solenoid 22 is energized, the valve body 21 moves upward and opens. When the opening degree is widened and the excitation is removed, the valve body 21 moves downward to narrow the opening degree.

FIG. 4 shows the circuit configuration of the combustion control device.

In this figure, 23 is a power source, 24 is a burner motor (driving morph of the forced air blower, etc.), and 25 is a pre-purge timer, which are connected to the power source 23 via a start switch 26.

Further, 25' is a contact point of the timer 25, and 27 is a fuel supply stop solenoid valve.
connected between.

28 is a supply fuel increase valve, and the supply fuel increase valve 28
is connected to the same point as the fuel supply stop solenoid valve 27 through the temperature sensitive switch 16 in series with the combustion air increase valve 18.

The fuel supply increase valve 28 opens and closes an increased fuel supply path (not shown) that is provided in parallel with the fuel supply path of the fuel supply stop electromagnetic valve 27, and opens when energized. , which closes when the power is turned off.

Reference numeral 29 denotes an igniter for the ignition plug 17, and the igniter 29 connects the R,
It is connected between S.

Next, the operation of the present invention will be explained.

Now, when the start switch 26 is closed to start the burner, the burner motor 24 starts and forced air is blown into the rotary carburetor 6 through the blower chamber 8 and the blower tube 9, and at the same time, the breapage timer 25 operates. Since the contact 25' is closed, the fuel supply stop solenoid valve 27 is energized and fuel is supplied from the fuel supply pipe 12.

Then, due to the rotation of the rotary carburetor 6, the fuel is sprayed in the form of fine particles into the rotary carburetor 6 on the surface of the fuel scattering body 11, and is mixed with the forced air supplied from the blower tube 9 in the mixture passage 10. In addition, the fuel is sprayed into the combustion cylinder 1 from the fuel spray gap 13.

Further, at the same time as the start switch 26 is closed, the igniter 29 is energized through the contact 30, a spark is generated in the ignition plug 28, and raw combustion occurs in the combustion tube 1.

Then, when the rotary vaporizer cylinder 6 is heated by the combustion flame generated by raw combustion, the fuel sprayed in the rotary vaporizer cylinder 6 is evaporated and vaporized, and mixed with the forced air to generate vaporized gas.

This vaporized gas flows into the gas chamber 4 communicating with the rotary vaporizing cylinder 6 and is ejected into the combustion cylinder 1 from the flame hole 5 on the inner cylinder 3 surface, so that vaporization combustion occurs in the combustion cylinder 1, and from then on Evaporative combustion is maintained.

By the way, in the conventional vaporizing burner, immediately after the transition from the live combustion state to the vaporizing combustion state as described above, the combustion tube 1 is not yet sufficiently heated and is cooled, so that a part of the vaporized gas that has entered the gas chamber 4 is It was observed that the liquid cooled and liquefied and accumulated on the bottom wall.

For this reason, the amount of fuel in the vaporized gas that is ejected from the flame hole 5 into the combustion tube 1 is reduced accordingly, resulting in an excess of combustion air, and the flame floats up from the flame hole 5 or a part of it rises. This often led to unstable combustion, such as the flames disappearing.

However, in the case of the present invention, the temperature-sensitive switch 16 provided on the outer wall of the combustion tube 1 is not activated until the temperature of the combustion tube 1 rises to a temperature at which the vaporized gas is not liquefied, and the temperature-sensitive switch 16 remains closed. During this time, the combustion air increase valve 18 is kept wide open and the fuel supply increase valve 28 is kept open, so that a larger amount of combustion air and fuel is supplied in the rotary carburetor 6 than in the steady state of combustion. Since air and fuel oil are supplied, there is a large amount of raw combustion in the combustion tube 1, and the combustion tube 1 is rapidly heated.

Therefore, even immediately after transitioning from the raw combustion state to the vaporization combustion state, the combustion tube 1 has already reached a temperature at which the vaporized gas is not cooled and liquefied, and there is no possibility of the flame rising or partially extinguishing due to this.

When the temperature of the combustion tube 1 rises to a predetermined temperature, the temperature-sensitive switch 16 is activated and its contacts are opened, so the combustion air increase valve 18 is switched to the narrow opening side, and the supply fuel increase valve 18 is switched to the narrow opening side.
is closed, a specified amount of combustion air is blown in a steady combustion state, and a specified amount of fuel is supplied.

In short, the present invention provides a combustion cylinder 1 in which a gas chamber 4 is formed between an outer cylinder 2 and an inner cylinder 3 having a large number of flame holes 5, and a rotary vaporizer cylinder 6 whose inside is communicated with the gas chamber 4. In the vaporization burner, which blows forced air into the rotary vaporization cylinder 6 and supplies fuel to transition from the initial raw combustion state to the vaporization combustion state, the outer wall of the combustion cylinder 1 is provided with a A temperature-sensitive switch 16 that operates when a certain temperature is reached is provided, as well as a combustion air increasing valve 18 and a supply fuel increasing valve 28 for blowing into the rotary carburetor 6.
Since the structure is configured to rapidly heat the combustion tube 1 by increasing the amount of combustion air and fuel supplied within the range where the combustion air and fuel supply do not operate, the combustion tube 1 is heated up rapidly after the burner is ignited until the temperature of the combustion tube 1 rises above the temperature at which the vaporized gas is liquefied. In this method, the amount of combustion is temporarily increased, the combustion tube 1 is heated to a sufficiently high temperature during the transition from the raw combustion state to the vaporization combustion state, and immediately after the transition to vaporization combustion, a portion of the vaporized gas is liquefied. This has the effect of eliminating phenomena such as rising and extinguishing of the flame caused by the flame, and stabilizing the combustion.

[Brief explanation of the drawing]

The drawings show one embodiment of the device of the present invention.
The figure is a longitudinal sectional front view showing the main parts of the vaporizing burner, FIGS. 2 and 3 are longitudinal sectional front views of the combustion air increase valve, and FIG. 4 is a circuit diagram of the combustion control device. 1... combustion cylinder, 2... its outer cylinder, 3.
...Inner cylinder, 4...Gas chamber, 5...
・Flame hole, 6...Rotating vaporizer cylinder, 8...
Blow chamber, 9...Blow tube, 10...Mixture passage, 11...Fuel scatter, 12...
Fuel supply pipe, 13...Fuel spray gap, 14...
... Fumarole chamber, 15... Fumarole port, 16...
・Temperature-sensitive switch, 18... Combustion air increase valve, 2
3...Power supply, 24...Burner motor,
25...Breapage timer, 26...
Start switch, 27...Fuel supply stop solenoid valve,
28...Supply fuel increase valve.

Claims (1)

[Claims] 1. A rotary vaporizing cylinder whose inside is connected to the gas chamber is provided in a combustion cylinder in which a gas chamber is formed between an outer cylinder and an inner cylinder having a large number of flame holes, and a forced Blow the wind,
In a vaporizing burner that supplies fuel to transition from an initial raw combustion state to a vaporizing combustion state, the outer cylinder of the combustion cylinder is provided with a temperature-sensitive switch that is activated when a certain temperature is reached after the burner is ignited, and a rotary vaporizing cylinder is provided. Combustion in a vaporizing burner characterized in that a combustion air increasing valve and a fuel supply increasing valve are provided to increase the amount of combustion air and fuel supplied to rapidly heat the combustion tube within a range where the temperature-sensitive switch does not operate. Control device