JPH038443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 structure and problems Conventionally, this type of liquid fuel combustion device has a heater installed at the bottom of the vaporizer, a blower passage connected to the blower on the side wall of the vaporizer, and a fuel tube with a nose-shaped tip. A thin tube is connected to the fuel pump and exposed.
A combustion tube having a burner port is connected to the vaporizer. Fuel is supplied from the tank by the fuel pump to the vaporizer through the fuel tube, where it is gasified on the high-temperature wall, mixed with air, and combusted at the flame port of the combustion tube.
In this combustion, the outflow speed of the fuel gas flowing out from the flame port and the combustion speed are balanced at the flame port, and the flame surface is kept flame-stabilized to sustain combustion. When the combustion load such as heating changed, the blower and fuel pump were adjusted to increase or decrease the amount of combustion. However, since the flame opening area of the combustion tube is constant, if the amount of combustion increases beyond a certain level, the flame will lift, producing unburned gas, CO, and odor.
Furthermore, when the amount of combustion decreased below a certain level, the flame surface became pale and the temperature of the flame part did not become high enough, causing the flame surface to partially disappear, producing unburned gas, CO, and odor. Also,
When the ratio of fuel and air changes, unburned gas,
In addition to the CO and odor, the flames approached the fire pit, causing it to overheat and become deformed. Therefore, the variable range of combustion amount that can maintain good combustion is limited.

OBJECTS OF THE INVENTION An object of the present invention is to expand the variable range of combustion amount by keeping the flame port load constant.

Structure of the Invention The present invention provides independent passages from a vaporizer to a plurality of combustion sections, and a means for opening and closing these passages is provided in one of the plurality of passages formed in the combustion section. Since the means for adjusting the supply amount of fuel and air are interlocked, the flame can be stabilized by changing the flame port area according to the increase or decrease in the amount of combustion and keeping the flame port load constant.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below.
In the figure, 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. Further, a blower 5 is provided on the side wall of the carburetor 1 via a blower passage 4, and a fuel thin tube 6 whose tip forms a nozzle is made to face the carburetor 1 through the blower passage 4, and the other end of this fuel thin tube 6 is made to face the carburetor 1 through the blower passage 4. is connected to a fuel tank 8 via a fuel pump 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 section 13 consisting of 12 parts is provided, and the upper end of this combustion part 13 is closed by a closing plate 14. An outer cylinder 16 is provided around the combustion section 13 via a combustion space 15 whose one end is closed by a closing plate 14. A passageway for flowing to the outside is formed by a spout 18 provided in the. The combustion section 13 is configured by partitioning the rectifying cylinder 10, the rectifying space 11, and the wire mesh 12 by a partition plate 19. An opening 20 is provided in the center of the partition plate 19, and a valve shaft is arranged opposite to the opening 20. A valve 22 connected to a valve 21 is movably provided, and the other end of the valve shaft 21 is inserted into a solenoid 23. This valve 22 is provided in a passage leading from the carburetor 1 to the combustion section 13, and opens and closes this passage.

Next, the operation will be explained. By energizing the heater 2 in the vaporizer 1, the heating temperature of the vaporizer 1 is increased. Thereafter, combustion air is introduced into the carburetor 1 by driving the blower 5 provided through the blower passage 4 . Subsequently, the fuel pump 7 is driven to draw fuel from the fuel tank 8, and the fuel is injected into the carburetor 1 from the nozzle at the tip of the 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 above and flows to the combustion section 13. At this time, the vaporized fuel gas is mixed with combustion air, flows outward from the periphery of the combustion section 13 arranged with a wire mesh as a premixture, and is ignited in the combustion space 15 between the outer cylinder 16 and the combustion section 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 stem 21 moves up and down by turning the solenoid 23 ON and OFF, and the opening 20 is opened by the valve 22 attached to the valve stem 21.
opens and closes. The combustion section 13 is separated into two parts by a partition plate 19, and has a plurality of passages from the vaporizer 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
Turn it OFF, lower the valve 22, and communicate the opening 20. Fuel and air according to the amount of combustion are supplied by the fuel pump 7 and the blower 5.
The valve 22 opens in conjunction with the flow rate of the gas, and part of the vaporized fuel gas flows out from the lower part of the combustion part 13, and the other part flows out from the upper part of the combustion part 13 through the opening 20.
The entire area of the wire mesh 12 in the combustion section 13 burns. When the combustion amount is small, the solenoid 23 is turned on in conjunction with the flow rates of the fuel pump 7 and blower 5, causing the valve 22 to rise and the opening 20 to be closed. The fuel gas that is vaporized by being supplied with fuel and air according to the small amount of combustion does not flow to the upper part of the combustion section 13 because the openings 20 are closed, but flows out from the lower straightening cylinder 10 and the wire mesh 12. . Therefore, the flame is formed only in the lower part of the combustion section 13. Therefore, when the amount of combustion is large, wire mesh 1
2 has a large flame port area, and when the amount of combustion is small, the flame port area becomes small. That is, the flame port load becomes a constant value, and the outflow velocity corresponding to the combustion speed becomes a constant value. For this reason, the flame does not cause lifting because the outflow speed is fast, and the flame does not pulsate, back up, or disappear due to thinning because the outflow speed is slow. Since you can set the area to be strong or weak,
It is tolerant of changes in the fuel-air ratio, and unburned gas,
It does not produce any odor and does not give off red heat. By changing the ratio of the upper and lower parts of the combustion section 13 separated by the partition plate 19, the amount of combustion can be significantly reduced while maintaining good combustion. For example, the ratio of the top and bottom of the combustion section 13 is set to 3:1.
Then, if the large combustion amount is set to 4000Kcal/h, the small combustion amount with valve 20 closed will be 1000Kcal/h.
Even if it is set to , the flame opening load remains the same value, the flame formed on the wire mesh remains the same, and the TDR is 1/4, making it possible to greatly vary the amount of combustion. Therefore, by simultaneously interlocking the fuel pump 7 that supplies fuel, the blower 5, and the solenoid 23, effective combustion can be maintained even when switching the combustion amount.

Effects of the Invention The present invention provides an opening/closing means in one of the passages leading from the vaporizer to the plurality of combustion sections, and links the opening/closing means with the means for adjusting the supply amount of liquid fuel and air. Even when the combustion amount is variable, stable combustion can be maintained without any change in the flame outlet load, making it possible to greatly adjust the combustion amount, making it comfortable and comfortable.
It enables energy saving and allows stable combustion by setting the flame port load for each size of combustion amount. Therefore, by setting the flame port load small, it is possible to lower the flame temperature and achieve low _NOx. It is something. In addition, since there is only one vaporizer and the opening/closing means is provided on one side of the passage, there is only one heating means, which is simple, high reliability, and low cost. The combustion part is kept at a high temperature, and the mixed gas of air and fuel is cooled during switching, so that the fuel condenses, there is no flame misfire, a good combustion condition is maintained, and odor due to gas is not generated. Moreover, since the opening/closing means is at a high temperature, high reliability can be maintained without causing malfunctions due to sticking of the valve portion due to tar adhesion due to fuel condensation.

[Brief explanation of the drawing]

The figure is a sectional view showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Carburizer, 2... Heater, 5... Blower, 7... Fuel pump, 13... Combustion part, 19...
... Partition plate, 20 ... Opening hole (passage), 22 ... Valve (means for opening and closing), 23 ... Solenoid.

Claims (1)

[Claims] 1 A vaporizer having a heating means is connected to the means for supplying liquid fuel and air, and passages leading to a plurality of combustion parts are provided in the vaporizer and branched within the combustion part, and the passages are opened and closed. A liquid fuel combustion apparatus, wherein a means for opening and closing the passage is provided in one of the plurality of passages, and a means for opening and closing the passage and a means for supplying the liquid fuel and air are linked.