JPH0370122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid fuel combustion device that vaporizes liquid fuel and burns gas premixed with air at a flame opening.

Conventional technology Conventionally, this type of liquid fuel combustion device has a heater embedded in the lower part of the vaporizer, and a ventilation passage connected to the blower on the side wall of the vaporizer, and a fuel capillary with a nozzle-shaped tip connected to the fuel pump. I have prepared it for you. A combustion tube having a burner port is connected to the vaporizer. Fuel was supplied from the tank by the fuel pump to the vaporizer through the fuel tube, where it was gasified on the high-temperature wall, mixed with air, and combusted at the flame port of the combustion tube.

Problems to be Solved by the Invention However, in the above configuration, combustion is
The outflow velocity of the fuel gas flowing out from the flame mouth and the combustion velocity are balanced at the flame mouth, maintaining the flame front and sustaining combustion. When the combustion load changes due to heating, etc., the blower and fuel pump are adjusted to increase or decrease the amount of combustion.
However, since the area of the flame opening of the liquid combustion tube is constant, when the amount of combustion exceeds a certain level, the flame will rift.
Unburned gas, CO, and odor are generated, and when the amount of combustion falls below a certain level, the flame surface becomes pale and the temperature of the flame part does not become high enough, so the flame surface partially disappears, causing unburned gas, CO, and odor to be generated. occured. Furthermore, when the ratio of fuel and air changed, in addition to unburned gas, CO, and odor, the flame approached the flame nozzle and overheated the flame nozzle, causing deformation. Therefore, the variable range of combustion amount that can maintain good combustion is limited.

Therefore, by providing independent passages in multiple combustion sections and providing means for opening and closing these passages,
It is possible to keep the load at the flame port constant and vary the combustion amount over a wide range (for example, Japanese Utility Model Application Publication No. 77051/1982), but the means to open and close it becomes hot due to the passage of vaporized gas, making it difficult to maintain a long-term seal. It was difficult.

The present invention solves these conventional problems, and aims to widen the variable range of combustion amount and maintain good combustion by keeping the flame port load constant.

Means for Solving the Problems In order to solve the above problems, the liquid fuel burning device of the present invention includes a combustion section that communicates with a vaporizer, a partition plate that partitions the combustion section into a plurality of parts, and a partition plate that divides the combustion section into a plurality of parts. A passage having an opening and communicating the combustion section divided into a plurality of sections, and a means for opening and closing the passage are provided, and an air passage is provided in the means for opening and closing the passage from the middle of the means for supplying air to the combustion section. It is a communication of

Effects The present invention stabilizes the flame by varying the flame opening area according to the amount of combustion and keeping the flame opening load constant, and also supplies air to the means for opening and closing to maintain a fuel gas seal. This can prevent unburned gas from flowing out.

Embodiment Hereinafter, a description will be given based on an embodiment of the present invention.
In FIG. 1, a heater 2 is embedded in the circumferential direction of the side surface of a bottomed vaporizer 1, and a mixing plate 3 having a diaphragm shape is attached to the open surface. Furthermore, vaporizer 1
A blower 5 is provided on the side wall of the engine via a ventilation passage 4, and a fuel capillary 6 whose tip constitutes a nozzle faces the carburetor 1 through the power supply passage 4, and the other end of this fuel capillary 6 is connected to a fuel pump. It is connected to a fuel tank 8 via 7. In the upper part of the vaporizer 1, along the circumferential direction, there is a rectifying cylinder 10 formed into a cylindrical shape and having a large number of pores 9, and a wire mesh provided around the rectifying cylinder 10 with a rectifying space 11 interposed therebetween. A combustion tube 13 consisting of 12 cylinders is provided, and the upper end of the combustion tube 13 is closed by a closing plate 14. and combustion tube 1
An outer periphery 16 is provided around the outer cylinder 1 through a combustion space 15 whose one end is closed by a closing plate 14.
The other end of the support tube 17 is covered with a support tube 17, and the combustion gas forms a passage through which the combustion gas flows to the outside through a jet port 18 provided in the support tube 17. The combustion tube 13 is constructed by partitioning the rectifying tube 10, the rectifying space 11, and the wire mesh 12 by a partition plate 19. The partition plate 19 is provided with an opening 20, and a valve shaft 21 is provided opposite to the opening 20. A connected valve 22 is movably provided, and the other valve shaft 21 is inserted into a solenoid 23. The valve 22 has a protrusion 24 on its outer periphery, and a time gap 2 during which the valve 22 is seated in the opening 20
yields 5. A pipe A26 passing through the outer periphery of the valve shaft 21 from the middle of the blower passage 4 and communicating with the gap 25;
A pipe B27 is provided.

Next, the operation will be explained. By energizing the heater 2 in the vaporizer 1, the vaporizer 1 is heated and its temperature is increased. Thereafter, combustion air is introduced into the carburetor 1 by driving the blower 5 provided through the blower passage 4 . Subsequently, fuel is sucked from the fuel tank 8 by driving the fuel pump 7, and the fuel is injected into the carburetor 1 from the nozzle at the tip of the thin fuel tube 6. The ejected fuel becomes granular and collides with the wall of the vaporizer 1, receives heat from the high-temperature wall and becomes vaporized gas, which passes through the constricted portion of the mixing plate 3 disposed at the top and flows into the combustion tube 13. At this time, the vaporized fuel gas is mixed with combustion air, flows outward from the periphery of the combustion tube 13 equipped with a wire mesh as a premixture, and is ignited in the combustion space 15 between the outer tube 16 and the combustion tube 13. It is ignited by a container (not shown), and a combustion flame is formed on the surface of the wire mesh 12. The valve shaft 21 moves up and down by turning the solenoid 23 ON and OFF.
The aperture 20 is opened and closed by a valve 22 attached to a valve shaft 21. The combustion tube 13 is separated into two by a partition plate 19, and has a plurality of passages from the carburetor 1 to the wire mesh 12 and a plurality of flame ports of the wire mesh 12. By opening and closing the opening 20 with the valve 22, the fuel gas supplied to one of the wire meshes 12 can be shut off.

In other words, when the combustion amount is large, the solenoid 23
is turned off, the valve 22 is raised, and the aperture 20 is communicated. Then, fuel and air according to the amount of combustion are supplied by the fuel pump 7 and blower 5, and the vaporized fuel gas flows out from the carburetor 1 to the combustion tube 13 and flows into the upper part of the combustion tube 13 through the opening 20. A part of the combustion gas flows in and burns in the entire area of the wire mesh 12 of the combustion tube 13. When the amount of combustion is small,
When the solenoid 23 is turned on, the valve 22 is lowered to close the opening 20. The fuel gas vaporized by being supplied with fuel and air according to the small combustion amount does not flow to the upper part of the combustion tube 13 because the opening 20 is closed.
It flows out from the lower straightening cylinder 10 to the wire mesh 12. Therefore, the flame is formed only in the lower part of the combustion tube 13. Therefore, when the amount of combustion is large, the area of the flame port made of wire mesh is large, and when the amount of combustion is small, the area of the flame port is small. In other words, the load at the flame port is constant and the outflow speed can be set according to the combustion speed, causing lifting of the flame due to the fast outflow speed, and local quenching due to pulsation, backlash, and thinning caused by the slow outflow speed. Never. In addition, since the burner area can be set to be strong or weak depending on the amount of combustion, there is tolerance for changes in the fuel-air ratio, and no unburned gas or odor is produced, and the burner does not become red hot. By changing the ratio of the upper and lower areas of the combustion tube 13, the combustion amount can be significantly reduced while maintaining good combustion when the combustion amount is small. For this reason, a wide combustion amount variable range is provided. When the amount of combustion is small, if even a small amount of fuel gas leaks upward through the openings 20, the raw gas will decompose in the high temperature area and produce a strong odor, which is unpleasant. A part of the air sent by the blower 5 passes through the pipe A26 and the pipe B27 to the valve 22 and the opening 2.
It is constantly supplied to the gap 25 at 0. The static pressure inside the rectifying tube 10 is communicated with the atmosphere through the many pores 9, so it is much smaller than the static pressure at the outlet of the pipe B27. Therefore, air always flows inside the pipe B27. When the solenoid 23 is turned off and the valve 22 is seated on the partition plate 19, the air flowing out from the pipe B27 fills the gap 25, some of it flows out from between the valve 22 and the partition plate 19, and the rest flows through the opening 20. It flows into the lower rectifier cylinder 10. For this reason, the opening 2
Fuel gas does not flow upward from 0 and is always sealed with air. Therefore, the valve 20 and the partition plate 1
Even if 9 is thermally deformed, the seal can be maintained completely, and good combustion can be maintained without emitting unburned gas. Furthermore, by flowing air through the valve 20, it is cooled and corrosion and deformation do not occur.

FIG. 2 is another embodiment of the invention. valve 22
As the valve shaft 21 moves up and down, the protrusion on the outer periphery contacts the partition plate 19, and at the same time, the valve plate 28, which is fixed to the valve shaft 21 on the same plane as the protrusion of the valve 22, closes the opening 20. The air flowing out from the pipe B27 flows out into the gap 25 from the hole provided in the center of the valve plate 28, partially flows out from between the valve 22 and the partition plate 19, and flows into the lower rectifying tube 10 through the opening 20. leak. In this case, since the valve plate 28 and the aperture 20 are in contact with each other, there is little air flowing into the combustion gas in the lower part, and there is little change in the combustion air.

Effects of the Invention As described above, the liquid fuel combustion apparatus of the present invention provides the following effects.

The present invention provides a combustion section that communicates with a carburetor, a partition plate that partitions the combustion section into a plurality of sections, and a means for supplying air to the plurality of partitioned combustion sections by providing an opening in the partition plate. With the configuration in which the air passage is connected to the means for opening and closing the passage, stable combustion can be maintained without causing a change in the flame port load even when combustion is variable, so the amount of combustion can be greatly adjusted, providing comfort and energy savings. By increasing the flame temperature and setting the flame outlet load to a small value, it is possible to lower the flame temperature and achieve _NOx conversion. By supplying air to the opening and closing means, a complete and long-term fuel gas seal is maintained, preventing the generation of unburned gas and maintaining comfort. Further, when switching, unburned gas can be quickly discharged to the flame port by the air, and can be combusted while the flame mouth is at a high temperature, so that no odor or backfire occurs.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a liquid fuel combustion apparatus showing one embodiment of the present invention, and FIG. 2 is a sectional view showing another embodiment of the invention. 1... Carburizer, 2... Heater, 5... Blower, 7... Fuel pump, 13... Combustion tube, 19...
...Partition plate, 20... Hole, 22... Valve, 23...
Solenoid, 25...Gap, 26, 27...Pipe A, B.

Claims (1)

[Claims] 1. A combustion part that connects a means for supplying liquid fuel, a means for supplying air, and a vaporizer having a heating means, and communicates with the vaporizer, and a partition plate that partitions the combustion part into a plurality of parts; A passage is provided in the partition plate that communicates the combustion section divided into a plurality of holes, and a means for opening and closing the passage is provided, and an air passage is provided in the means for opening and closing the passage from the middle of the means for supplying air. A liquid fuel combustion device that communicates with