JPH0419298Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) This invention relates to a liquid fuel combustion device used in space heaters, water heaters, etc. In particular, the invention uses centrifugal force caused by rotation to scatter liquid fuel into the combustion section. This relates to a combustion device that mixes combustion air with combustion air.

(Prior art) In general, in this type of liquid fuel combustion device, the thermal power is adjusted by varying both the air flow rate and the oil flow rate. The amount of air blown was varied by changing the amount of air blown, and the amount of oil sent was varied by changing the discharge amount of the pump. However, in this conventional method, the air flow rate and the oil flow rate were individually controlled, which resulted in a complex structure and high cost.Also, the premixed vaporization combustion method using a flame port allows for adjustment of thermal power. There was a problem in that the heating power could not be adjusted steplessly because the range was narrow and if the heating power was reduced beyond the set range, backfire would occur at the flame opening and abnormal combustion would occur.

In addition, a fan is attached to the motor rotation shaft, and a liquid fuel suction passage is formed in the rotation shaft passing through it in the axial direction, and the liquid fuel is sucked up by the rotation of the motor and scattered into the vaporizer. There was also a combustion device that atomized by colliding with a diffusion vane in the vaporizer. However, in this type of combustion device, a preheater is disposed around the outer periphery of the vaporizer, and the preheater heats the vaporizer to vaporize the atomized fuel. The fuel vaporized in the carburetor was then sent to the vaporization cylinder where it was ignited and burned. Therefore, there were problems in that a preheating heater was required and the preheating time for heating the vaporizer was long. Also,
Another problem was that the structure of the burner section was complicated.

Furthermore, the vaporization tube is fixedly installed inside the combustion tube, and the vaporization tube is not equipped with a preheater. At the start of combustion, the fuel is dispersed from inside the vaporization tube into the combustion tube, and the fine particles are ignited, and then the combustion starts. There was also a liquid fuel combustion device in which the fuel was vaporized by heating the vaporizer cylinder from the outside, and the vaporized gas was mixed with combustion air and ejected from the flame port for combustion. However, since a flame port is used, the adjustment range for the heating power is narrow, and because the initial combustion takes place inside the combustion tube, which has a significantly larger volume than the inside of the vaporization tube, there is a problem that it takes time for the temperature of the vaporization tube to rise. It was hot.

(Purpose) This proposal was made in view of the above points, and is configured so that the amount of air and oil sent can be varied at the same time by a single control, and that direct combustion occurs without using a flame port. By using a simple structure that does not require a preheating heater and burning the primary combustion inside the vaporized body, there is no need for preheating time and combustion starts as soon as the combustion equipment starts operating. The object of the present invention is to provide a liquid fuel combustion device that can perform heating quickly by shortening the time required to raise the temperature of a vaporized body.

(Example) An example of the present invention shown in the drawings will be described in detail below.

1 is a fuel tank, 2 is a leveling device to which liquid fuel is supplied from the tank 1, 3 is a motor, and the motor shaft (rotating shaft) 4 has, for example, a spiral suction passage 5 passing through it in the axial direction. 2.
It is immersed in liquid fuel, and sucks up the liquid fuel through the suction passage 5 during rotation. 6 is nozzle hole 7
This is a fuel injection nozzle which is screwed and fixed to the upper end of the motor shaft 4, and when the fuel jet nozzle is screwed and fixed, the fuel scattering body 8 is fixed to the motor shaft 4 at the same time. 9 is a controller that detects the rotational speed of the motor shaft 4 and automatically controls the motor 3; 10 is a wind tunnel in which a rectifying plate 11 is installed; the motor shaft 4 is inserted vertically into the wind tunnel; The fan 12 is attached at a position below the plate 11. 13
is a burner having a large number of air holes 14 provided at the upper end of the wind tunnel 10, with a combustion section inside and a motor shaft 4.
The upper end of the fuel injection nozzle 6 and the fuel scattering body 8 are located. Reference numeral 15 indicates a vaporized body located within the burner 13 and divides the interior thereof into a primary combustion section and a secondary combustion section, and 16 indicates an ignition electrode. In addition, the above-mentioned vaporized body 1
An annular gap is formed between the outer peripheral end of burner 5 and the inner bottom of burner 13, and this gap serves as a fuel gas communication section. That is, the gas generated by combustion in the primary combustion section is supplied to the secondary combustion section only through this section.

In the above configuration, if the motor 3 is now driven,
As the motor shaft 4 rotates, the fan 12 sends combustion air through the wind tunnel 10 to the combustion section. on the other hand,
The liquid fuel in the leveling device 2 rises in the suction passage 5 due to the rotation of the motor shaft 4, is ejected from the nozzle hole 7 of the fuel injection nozzle 6, and is transmitted along the upper surface of the fuel splashing body 8 and is subjected to centrifugal force. As a result, it scatters as shown by arrow A and collides with the inner surface of the vaporized body 15, thereby becoming atomized. When this atomized fuel is ignited by the ignition electrode 16 disposed inside the vaporized body 15, combustion is started by obtaining primary air for combustion as shown by the arrow B inside the vaporized body 15.

When the temperature of the vaporized body 15 rises due to this combustion, the fuel immediately vaporizes due to the heat when it collides with the inner surface of the vaporized body 15.
As the amount of vaporized fuel increases, the amount of primary combustion air becomes insufficient, and the secondary combustion air (indicated by arrow C) flowing in from the air hole 14 of the burner 13 is moved toward the outside of the vaporized body 15. The flame moves to a state where a flame is formed from the air hole 14, and the vaporized fuel is directly combusted with the secondary air to heat the vaporized body from the outside, thereby transitioning to a steady combustion state.

In such a combustion state, the thermal power is adjusted by varying the rotational speed of the motor 3.

That is, when the rotational speed of the motor shaft 4 changes, not only the amount of air blown by the fan 12 changes, but also the amount of liquid fuel sucked up by the suction passage 5. Therefore, the amount of air and the amount of oil sent can be varied simultaneously by a single control of the rotational speed of the motor 3, and since the vaporized fuel is directly combusted without using a flame port, the By being able to control the rotation speed steplessly, it becomes possible to steplessly adjust the firepower.

Since the vaporized body 15 is provided inside the burner 13 and the primary combustion section is formed on the inner surface of the vaporized body 15 to perform the primary combustion, no preheating time is required, and the vaporized body 15
The time required to raise the temperature of the fuel can be shortened, vaporization can be smoothly promoted, and the transition from atomized combustion to vaporized combustion can be made faster. Furthermore, the structure of the burner section is also simplified.

In the above embodiment, the spiral suction passage 5 is formed on the motor shaft 4, but the suction passage 5 is not limited to the motor shaft 4. A passage 5 may be formed and a fan 12 may be attached.

<Effects of the invention> As described above, according to the configuration of the present invention, the air flow rate and the oil flow rate can be varied at the same time by a single control, and no backfire occurs even when the fire power is reduced, so the fire power can be adjusted steplessly. Adjustment is possible.

In addition, there is no need for preheating time, and combustion starts at the same time as operation starts, reducing the time required to raise the temperature of the vaporized material, promoting smooth vaporization, and speeding up the transition from atomized combustion to vaporized combustion for heating. can be done quickly. Furthermore, the structure of the burner section is simplified, which provides an excellent effect of reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration explanatory diagram showing the proposed combustion device;
FIG. 2 is a sectional view of the main parts of the same. 3... Motor, 4... Motor shaft (rotating shaft), 5
... Suction passage, 6 ... Fuel injection nozzle, 12
... Juan, 13... Burna, 15... Vaporized form.

Claims (1)

[Scope of Claim for Utility Model Registration] A burner is provided which has a large number of air holes on the side surface for supplying air for secondary combustion and has a combustion section inside, and a rotating shaft that passes through the inner bottom of the burner. A fan for sending combustion air to the combustion section is attached to the rotating shaft, a liquid fuel suction passage is formed axially through the rotating shaft, and one end of the rotating shaft is immersed in the liquid fuel. At the same time, a fuel injection nozzle is provided at the other end on the combustion section side, and the liquid fuel is scattered on the inner surface of the vaporized material in the combustion section using rotational centrifugal force, and is mixed with combustion air in the combustion section for combustion. In the liquid fuel combustion device, the vaporized body separates the inside of the burner forming the combustion section into a primary combustion section and a secondary combustion section, and also has a space between the outer peripheral end of the vaporized body and the inner bottom of the burner. A fuel gas communication part is formed, and the fuel gas from the primary combustion part is supplied to the secondary combustion part only through the fuel gas communication part, and the fuel injection nozzle and the ignition electrode for ignition are connected to the fuel gas communication part. A liquid fuel combustion device characterized in that it is arranged facing the primary combustion section inside the vaporized body.