JPS6337845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device using a vaporization premix combustion method using petroleum as fuel, which is applied to home heaters and the like.

A conventional combustion apparatus of this type is constructed as shown in FIG. To explain with reference to the drawings, 25 is a fuel pump, 26 is a supply pipe, and a guide tube 28 for air supplied from a blower 27 is located outside these pipes. A heater 30 heats the vaporized body 29 and the partition plate 31. A flame hole 32 made of wire mesh, a reinforcing ring 33, and a cap 34 are connected to the upper part of the vaporizer 29. 35 is an outer cylinder made of glass or the like; 36
is the support ring.

This combustion device first energizes the heater 30 to preheat the vaporized body 29 to 250 to 270°C for about 5 minutes, and then
Fuel and primary air are supplied to generate premixed gas within the vaporizer 29. This premixed gas is ejected from the inside of the flame hole portion 32 to the outside and burned. In this case, after the start of combustion, conductive heat from the flame hole 32 and outer cylinder 35 and radiant heat from the flame feed back to the vaporized body 29, but this is very small and the vaporized body 29, which is cooled by combustion and air, is fed back to the vaporized body 29. cannot be heated.

Therefore, the power to the heater 30 remains ON even after combustion starts.
Since the vaporized body 29 is always controlled to be kept above a certain temperature by -OFF or proportional means, power saving cannot be achieved. Further, the vaporized body 29 has a large heat capacity and requires a long preheating time.
Conventionally, in addition to the above configuration, there is also a type in which the combustion flame is directly applied to the upper part of the vaporized body 29 to achieve heat feedback, but it is difficult to shorten the preheating time, and the room temperature is 0.
At low temperatures below .degree. C., there are problems such as the need to energize the heater 30 for the vaporized material.

The present invention eliminates these conventional problems, and improves usability by significantly shortening the preheating time using a heater for the vaporized material.It also makes it possible to immediately shift to vaporization of the fuel using combustion heat after the start of combustion, thereby reducing the power supply to the heater.
The purpose is to turn it off and save power.

In order to achieve this object, the present invention provides a fuel discharge direction control means that rotates a pipe that discharges liquid fuel, and effectively controls the vaporizing part of the fuel at the time of ignition after completion of preheating and during steady combustion. It has been changed.

That is, at the time of ignition, the fuel scatters outward and vaporizes when it hits the inner wall surface of the vaporized body heated by the heater. This premixed gas is ejected from a flame hole connected to the vaporized body and burned, but the temperature of this flame hole also rises rapidly. At this time, when the direction of the pipe that was discharging liquid fuel toward the inner wall surface of the vaporized body is changed to the direction inside the flame hole, the discharged fuel particles travel straight along the center direction of the flame hole, and the vaporized body It hits the flame hole without coming into contact with the flame, where it vaporizes and burns.

Therefore, after the start of ignition combustion, the combustion heat is not fed back to the vaporizer equipped with a heater, but by using a part of the flame hole as a vaporization wall, the heater of the vaporizer is energized immediately after the start of combustion. of
Can be turned off. Further, even at low temperatures such as room temperature of 0° C. or higher, vaporization can be performed completely using combustion heat alone, resulting in large power savings. Furthermore, the vaporizer having a heater can be made smaller and the preheating time can be shortened.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Note that the same parts in FIGS. 1 to 3 are given the same numbers.

In the figure, 1 is a pipe and 2 is its flexible part. 3 is a fuel pump to which pipe 1 is connected. Reference numeral 4 denotes a rotatable fulcrum, which constitutes fuel discharge direction control means. 7 is a blower, and 5 and 6 are air conduits. Reference numeral 8 denotes a cylindrical vaporizer having a heater 9, which is made of aluminum or the like. 1
Reference numeral 0 designates the flame hole portion, which is composed of a flow regulator 11 having a large number of small holes 12, a wire mesh cylinder 13 positioned with a small gap, and a cap 14 that closes the tips of these, and an outer cylinder 15 made of glass or the like. It is also connected to the vaporizer 8.

Next, the operation of the combustion apparatus having the above configuration will be explained. First, when electricity is applied to the heater 9 of about 500 W, the temperature of the vaporized body 8 rises to 250 to 270° C. in about 2 minutes.

As shown in FIG. 1, when the blower 7 is energized and the fuel pump 3 is then driven, the fuel is discharged from the pipe 1, hits the inner wall surface of the vaporizer 8, and is vaporized. The premixed gas of vaporized gas and air is passed through the small holes 12 of the rectifying tube 11.
The fuel passes through and is ejected onto the outer surface of the wire mesh tube 13, where it is ignited by discharge sparks or the like and starts combustion. After the combustion starts, the temperature of the straightening tube 11 and cap 14 rapidly rises to 400 to 500 DEG C. due to radiant heat from the red-hot wire mesh tube 13 and exhaust heat. Thereafter, as shown in FIG. 2, by switching the fuel discharge direction control means, the fuel particles are allowed to advance through the straightening tube 11 without coming into contact with the vaporized body 8, and are vaporized when they hit the cap 14. Further, when the particles are scattered inside the straightening cylinder 11, a part of the particles vaporizes in the high temperature atmosphere.

These allow the vaporization state to be changed without affecting combustion in any way.

FIG. 3 shows temperature changes during the above operation.
First, when the heater 9 starts to be energized, the temperature of the vaporized body 8 rises as shown by the solid line, and later the temperature of the cap 14 also rises as shown by the broken line due to conduction heat. After about 2 minutes, the temperature of the vaporized body 8 reaches 270℃, and the temperature of the cap 14 reaches about 100℃, and when fuel is supplied and combustion starts, the temperature of the cap 14 rises rapidly, and the temperature of the vaporized body 8 reaches 270℃. Since the power is turned off, the temperature will drop to a certain level.

In this way, according to this embodiment, fine fuel particles are vaporized using the vaporizer 8 which is heated by the heater 9 only for a very short period of time during ignition, and after the start of combustion, the flame hole portion 1
By using the cap 14, which is a part of the combustion chamber, as a vaporization wall, there is no need to consider heat feedback from the flame hole portion 10 to the vaporization body 8 having the heater 9, and regular use after the start of combustion is eliminated. Under these conditions, there is very little tar adhesion because the gas is vaporized on the high-temperature vaporization wall surface and in the atmosphere. Since the vaporizer 8 also vaporizes the fuel only during ignition combustion, it can be made smaller and the preheating time can be shortened.

As described above, according to the combustion device of the present invention, fuel particles can be vaporized most effectively by changing the fuel discharge direction between ignition and steady combustion, resulting in significant power savings and Preheating time can be shortened.

[Brief explanation of drawings]

1 and 2 are side sectional views of a combustion device according to an embodiment of the present invention, FIG. 3 is a characteristic diagram showing a temperature change curve of the same embodiment, and FIG. 4 is a side sectional view of a conventional combustion device. It is a diagram. DESCRIPTION OF SYMBOLS 1... Pipe, 3... Fuel pump, 4... Fulcrum (fuel discharge direction control means), 8... Vaporized body, 10...
...flame hole, 14...cap.

Claims (1)

[Claims] 1. A pipe that discharges liquid fuel, a cylindrical vaporizer that vaporizes the liquid fuel discharged from this pipe,
A blower that is connected to the vaporized body via an air conduit and supplies combustion primary air to the vaporized gas generated in the vaporized body to produce a premixed gas, and a flame hole that is connected to the vaporized body and that burns the premixed gas. and a fuel discharge direction control means that moves the pipe and guides liquid fuel to the inner wall surface of the vaporized body at the start of combustion and into the flame hole at the time of steady combustion.