JPS6324342Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a liquid fuel combustion device that is widely used for heating, cooking, etc. in general households.

Conventional structure and problems Conventional vaporization burners, which evaporate liquid fuel on a high-temperature vaporization surface, mix this fuel gas with air, and burn it in the burner section, generate less soot and CO, and are difficult to control when igniting and extinguishing. is also easy. The means for heating the high-temperature evaporation surface that evaporates the fuel is based on an electric heater and combustion heat. During initial preheating and when the temperature is below the set temperature, the electric heater is used to heat the device, and a thermistor or the like that detects the vaporizing surface temperature is used to control the electric heater by turning it on and off. During steady combustion, the combustion heat is received without being heated by an electric heater to save power. In order to receive the heat of combustion, there were two methods: heat conduction from a heat receiving section installed near the flame, and heat transfer through combustion gas. The configuration in which the heat receiving section is provided near the flame changes in inverse proportion to the vaporization heat load when the combustion amount is increased or decreased. In other words, as the amount of combustion increases, the flame rises and becomes a flame, lowering the temperature of the burner head and lowering the temperature of the heat-receiving part.However, the latent heat and sensible heat of the fuel also increase according to the amount of combustion, and the temperature of the vaporizing surface decreases. do. On the other hand, when the amount of combustion decreases, the flame occurs near the burner head flame opening, and the temperature of the burner head and heat receiving part rises extremely.While the conductive heat increases, the heat of vaporization of the fuel decreases, so the temperature of the vaporization surface rises. For this reason, when the amount of combustion increases, a delay in vaporization occurs due to insufficient heat of vaporization, resulting in pulsation of combustion and odor, and when the amount of combustion decreases, backfire occurs due to the rise in temperature, which is extremely dangerous. Therefore, the variable range of combustion amount was limited to about 1/2.

In the heat transfer method using combustion gas, the amount of heat received increases or decreases depending on the vaporization heat load due to the increase or decrease in the amount of combustion. That is, when the combustion amount increases and the vaporization load increases, the exhaust gas amount increases and the exhaust gas temperature also rises.
Therefore, the vaporization characteristics are improved, and the variable range of combustion amount is 2
~30% improvement. However, in this method,
When the amount of combustion decreases below a certain amount, the temperature of the vaporization surface drops extremely. As a result, evaporation is delayed and odor is emitted.
It was dangerous as it produced unburned gas.

Purpose of invention The purpose of this invention is to expand the variable range of combustion amount.

Structure of the invention This invention consists of a passage for the combustion gas generated in the combustion section to flow around the carburetor, and by narrowing down the area of this passage to the part facing the carburetor, the exhaust gas is always kept around the carburetor. flows, the temperature of the vaporizing surface is maintained above a certain level, and the expansion section promotes mixture flame holding and stabilizes the flame, thereby expanding the variable range of combustion amount.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below based on the drawings. In the figure, 1 is a bottomed vaporizing cylinder, and a heater 2 is embedded in the circumferential direction in the lower part of the side surface.
A mixing plate 3 having a diaphragm shape is attached to the open surface. Further, a blowing fan 5 is provided on the side circumferential wall of the vaporizing cylinder 1 via a blowing passage 4, and a thin fuel tube 6 whose tip constitutes a nozzle is passed through the blowing passage 4 and facing the vaporizing cylinder 1 from a nozzle portion 7. The other end of this fuel thin tube 6 is connected to a fuel tank 9 via a fuel pump 8. At the upper part of the vaporizing cylinder 1, along the circumference of the cylinder, there is a rectifying cylinder 11 formed into a cylindrical shape with a large number of pores 10, and a combustion wire mesh 13 provided around the rectifying cylinder 11 via a rectifying space 12. A combustion tube 14 is provided, and this combustion tube 14 has a closing plate 1.
The upper end is closed by 5. Also, the combustion tube 14
An outer cylinder 17 is provided around the combustion space 16, one end of which is closed by a closing plate 15.
The other end is covered with a support tube 18, and this support tube 1
An exhaust gas outlet section 19 is provided at the lower part of the exhaust gas outlet section 8 .
A flow passage space 20 is provided between the vaporization tube 1 and the support tube 18, through which combustion gas flows around the vaporization tube 1.
A protruding ring 2 is provided in the middle of this flow passage space 20.
1 and 22 are provided. The area of the flow passage space 20 is suddenly narrowed to a small size at the protruding rings 21 and 22, and the area increases after the protruding rings 21 and 22.

Next, the operation will be explained.

The vaporization cylinder 1 is heated by supplying electricity to the heater 2 . Thereafter, by driving a blower fan 5 provided through the blower passage 4, combustion air is introduced into the vaporizer cylinder 1 from the nozzle portion 7. Subsequently, fuel is sucked from the fuel tank 9 by driving the fuel pump 8, and the fuel is injected into the vaporization cylinder 1 from the tip nozzle portion of the fuel thin tube 6. Since the wall surface of the vaporization cylinder 1 is at a high temperature, the fuel becomes a vaporized gas and flows into the combustion cylinder 14 through the constriction part of the mixing plate 3 disposed at the upper part. At this time, the fuel vaporized gas is mixed with combustion air, flows out as a premixture from the periphery of the combustion tube 14 arranged with a wire mesh, and is transferred to the outer tube 17 and the combustion tube 14.
The fuel is ignited by an igniter (not shown) in the fuel tube 16 between the two, and a combustion flame is formed on the surface of the combustion wire mesh 13. The combustion gas flows from the fuel space 16 to the flow path space 2.
0 and flows to the outside from the exhaust gas outlet section 19. At this time, the protruding rings 21 and 22 allow the flow passage space 2
Because the area of 0 is suddenly narrowed down and then expanded,
The combustion gas forms a flow in contact with the outer surface of the vaporization tube 1, and turbulence occurs in the combustion gas at the enlarged portion, so that the high-temperature exhaust gas comes into contact with the vaporization tube 1 again. Further, although the flame is generated in the combustion chamber 16, the combustion completed portion of the secondary flame extends into the flow passage space 20. Therefore, if a constricted part and an enlarged part are provided in the flow passage space 20, the flow velocity will suddenly increase and the secondary flame will be stably formed at the constricted part. Also, in the enlarged section, combustion gases are mixed. Therefore, complete combustion can be achieved even when the amount of air and combustion amount fluctuates, and even when the temperature of the vaporizing cylinder fluctuates. Therefore, the adjustable combustion range can be set to be wider than conventional 1/
The range, which used to be about 2, has now been significantly reduced to about 1/3.

Further, when secondary air is supplied to the enlarged portion, the mixed combustion flame is surrounded by air, and the range (combustion adjustment width) in which complete combustion is performed becomes larger. When a large number of protruding rings 20 and 21 are provided, each of the protruding rings 20 and 21 performs the above-mentioned action, thereby promoting combustion and making it possible to uniformly and stably heat the carburetor 1.

Effects of the Invention As described above, according to the liquid fuel combustion device of the present invention, a passage is formed in which the combustion gas generated in the combustion section flows around the vaporizer, and by narrowing the exit part of this passage, the combustion gas is vaporized. Since exhaust gas constantly flows around the vessel, the temperature of the vaporizing surface is kept above a certain level, stabilizing the flame, promoting mixing, and improving flame stability.
This makes it possible to expand the variable range of combustion amount. Furthermore, the electric heater is energized only during ignition, resulting in high power savings.

[Brief explanation of the drawing]

The drawing is a sectional view of a liquid fuel combustion device showing an embodiment of the present invention. 1... vaporizer, 2... heating heater, 14...
Combustion cylinder, 16... Combustion space, 17... Outer cylinder, 18
...Support tube, 20...Flow passage space, 21, 22...
...Protruding ring (diaphragm part and enlarged part).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A combustion section is provided which is connected to a means for supplying liquid fuel and air and connected to a vaporizer having a heating means, and the combustion gas generated in the combustion section is connected to the vaporizer. A liquid fuel combustion device comprising a passage flowing around the vaporizer, and a constricted area and an enlarged area of the passage facing the vaporizer. (2) The liquid fuel combustion device according to claim 1, which is provided with means for supplying secondary air to the enlarged portion. (3) The liquid fuel combustion device according to claim 1 of the utility model registration claim, which is provided with a plurality of constricted portions and a plurality of enlarged portions.