JPS6312205B2 - - 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, mixes it with combustion air, and burns it on the surface of a wire mesh or the like.

Structure of Conventional Example and Its Problems A conventional liquid fuel combustion apparatus of this type is shown in FIG. 1 and will be described. A fuel supply port 5 and an air supply port 6 connected to a fuel pump 3 and a combustion fan 4 are opened in the side wall of a pot-shaped vaporization cylinder 2 heated by a heater 1 . In addition, there are many small holes 16 in the upper part of the vaporizer cylinder 2.
A combustion tube 9 made of wire gauze is arranged around the straightening tube 7 with an integer space 8 interposed therebetween. Furthermore, a protection tube 11 is provided around the combustion tube 9 with an exhaust space 10 in between. On the other hand, a diaphragm plate 13 with an opening 12 is disposed at the upper opening of the vaporization tube 2, and a vaporization chamber 14 is divided by the vaporization tube 2, and a mixing space 15 is defined by the rectification tube 7. are divided. In the above configuration, when the heater 1 is energized and the vaporization cylinder 2 is heated to a predetermined temperature, the fuel pump 3 and combustion fan 4 are activated to supply liquid fuel and combustion air to the vaporization chamber 14. The liquid fuel that has entered the vaporization chamber 14 is vaporized on the heated inner wall of the vaporization cylinder 2, mixed with combustion air, and discharged from the vaporization chamber 14 through the opening 12 of the throttle plate 13 into the mixing chamber 15. The air-fuel mixture that has entered the mixing chamber 15 is further uniformly mixed and is ejected from the combustion tube 9 through the many small holes 16 of the rectifying tube 7 through the rectifying space 8, and is ignited by an ignition device (not shown). Combustion is performed on the surface of the combustion tube 9. However, in the above-mentioned conventional example, the high-temperature exhaust gas after being combusted in the combustion tube 9 is exhausted upward through the exhaust space 10, giving little heat to the vaporization tube 2. Therefore, in order to maintain the vaporization tube 2 at a predetermined temperature, it is necessary to energize the heater 1, which is uneconomical. In order to eliminate this drawback, it is conceivable to provide a heat receiving part integrally with the vaporizer tube 2 on the outer periphery of the vaporizer tube 2 at the part that contacts the protection tube 11, but this increases the weight of the vaporizer tube 2 and takes a long preheating time. A shortcoming had arisen. Therefore, the configuration shown in FIG. 2 has been proposed to solve the above drawbacks, recover heat from the combustion exhaust gas, and prevent an increase in preheating time due to an increase in the weight of the vaporization chamber.

A burner base 21 is in contact with the bottom surface of the vaporization tube 2 placed horizontally and heated by the heater 1, and an air chamber 22 is formed by the bottom surface of the vaporization tube. A combustion fan 4 is connected, and an air supply port 23 and a nozzle port 24 are opened at the bottom of the carburetor cylinder in communication with the air chamber 22, and the air supply port 23 receives combustion air supplied from the combustion fan 4. A wind direction plate 25 is provided to blow out the air into the vaporizing chamber 14. In addition, the nozzle port 24 is provided with an oil supply pump 3.
The oil supply pipe 26 connected to is open. An opening 12 is provided on the open end surface of the vaporizing cylinder 2 as in FIG.
A diaphragm plate 13 provided with a diaphragm plate 13 and a large number of small holes 16 are provided,
A laterally arranged rectifier tube 7 and a laterally arranged combustion tube 9 made of wire mesh are provided. Exhaust space 10 between combustion tube 9 and protection tube 11
One end is closed by a burner cover 27. The protection tube 11 is supported by a support tube 29 that is integral with the burner base 21 and has an exhaust port 28 on its side wall. 30 and 31 are long screws and nuts for assembling the combustion device. In the above configuration, when the vaporization cylinder 2 reaches a predetermined temperature, the fuel pump 3 and the combustion fan 4 are activated, liquid fuel is supplied to the vaporization chamber 14 through the fuel supply pipe 26, and the heated inner wall of the vaporization cylinder 2 is heated. At the same time as the combustion air is vaporized, it is blown out from the air chamber 22 through the air supply port 23 into the vaporization chamber 14 by the wind direction plate 25, and mixed with the vaporized gas. The air-fuel mixture in the vaporization chamber 14 flows into the mixing chamber 15 through the opening 12 of the throttle plate 13 . The air-fuel mixture that has been more uniformly mixed in the mixing chamber 15 flows out from the small holes 16 of the rectifier tube 7 and is combusted on the surface of the combustion tube 9. The high temperature exhaust gas after combustion is
After flowing through the exhaust space 10 and heating the vaporizing cylinder 2, it is discharged from the exhaust port 28 provided in the support cylinder 29. In this configuration, the exhaust gas is
Since heat recovery can be obtained extremely easily, the heater 1 that heats the vaporizer cylinder 2 only needs to be energized at the beginning of operation, and is heated by the combustion heat during operation, so there is no need to energize it, making it economical. be. Furthermore, since no special part is required for heat reception, the weight of the vaporizing cylinder does not increase and the preheating time does not take long. However, in the configuration shown in FIG.
However, due to the draft caused by the heat, the exhaust gas flows upward in the exhaust space 10, thereby mainly heating the upper half of the outer circumferential side wall of the vaporizer cylinder 2. On the other hand, the liquid fuel supplied into the vaporization chamber 14 is vaporized on the lower inner wall of the vaporization cylinder 2 due to its own weight, but at that time, the latent heat of vaporization is carried away from the vaporization wall, while the heat is received from the combustion exhaust gas. Because the temperature is not sufficient, the temperature at the vaporization surface decreases,
It had the disadvantage of easily generating tar. In addition, if the amount of heat received from the exhaust gas is increased to the temperature required to vaporize the lower side wall of the carburetor 2, which tends to become cold, the upper side wall of the carburetor 2 will become too hot, resulting in poor durability. decreases or, in severe cases, melts.

Purpose of the invention The present invention eliminates the drawbacks in the above conventional examples,
The purpose is to prevent tar formation and melting of the vaporizer cylinder.

Structure of the Invention In order to achieve the above object, the present invention increases the amount of heat received from the exhaust gas by making the area of the heat receiving part in contact with the exhaust gas on the outer periphery of the vaporization cylinder larger than that in the lower part of the vaporization cylinder where the liquid fuel is vaporized. At the same time, by increasing the temperature of the part where the liquid fuel is vaporized and keeping the other parts at a low temperature, durability can be improved. This provides a highly efficient liquid fuel combustion device.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Components in the figure that are the same as those in FIG. 2 are indicated by the same numbers, and explanations thereof will be omitted. In the vaporization tube 2, heat receiving fins 101 are integrally provided on the outer periphery of the lower side wall where the liquid fuel is vaporized, and recover heat from the combustion exhaust gas to strengthen the lower side wall of the vaporization tube 2. It is configured to heat. In the above configuration, when liquid fuel and combustion air are supplied to the vaporization chamber 14, the liquid fuel is vaporized on the lower side wall of the heated vaporization tube 2, mixed with combustion air to form a mixed gas, and the combustion chamber 14 is supplied with liquid fuel and combustion air. Burns at 9. The high-temperature combustion exhaust gas from combustion passes through the exhaust space 10 and is discharged from an exhaust port 28 provided in the support tube 29, but at this time it comes into contact with the outer peripheral wall of the vaporization tube 2 and heats the vaporization tube 2. Since the heat receiving fins 101 are provided on the lower side wall of the outer periphery of the vaporizing cylinder 2, more heat is given to the lower side wall by the exhaust gas, the lower side wall is heated up, and the liquid fuel is vaporized by vaporization. Even if the latent heat is stolen, the temperature will not drop, and tar generation can be prevented. Also,
Since sufficient heat for vaporization is supplied to the lower side wall of the vaporization tube 2 by the heat receiving fins 101, other parts of the vaporization tube 2 do not need to be heated to high temperatures, and durability can be improved. In addition, Figures 3 and 4
In the embodiment shown in the figure, the heat receiving fins 101 are partially provided on the outer periphery of the vaporizing cylinder 2, but in other embodiments,
It goes without saying that the fin height may be changed as shown in FIG.

Effects of the Invention As is clear from the above explanation, according to the present invention, the vaporization cylinder has a heat receiving area at the lower part of the vaporization cylinder where the liquid fuel is vaporized, on the outer peripheral heat receiving surface heated by the exhaust gas. By increasing the temperature, it is possible to prevent the temperature of the vaporization surface where the liquid fuel is vaporized from decreasing and to prevent the generation of tar, and it is also possible to heat only the necessary vaporization surface and lower the temperature of other parts. As a result, durability can be increased, and deformation and melting caused by significant localized temperatures can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a conventional liquid fuel combustion device, FIG. 2 is a vertical cross-sectional view showing another conventional liquid fuel combustion device, and FIG. 3 is a vertical cross-sectional view showing an embodiment of the liquid fuel combustion device of the present invention. FIG. 4 is a cross-sectional view of the vaporization tube 2 of the embodiment shown in FIG. 3, and FIG. 5 is a cross-sectional view of the vaporization tube of a liquid fuel combustion device in another embodiment of the present invention. . DESCRIPTION OF SYMBOLS 1... Heater, 2... Vaporization tube, 3... Oil supply pump, 4... Combustion fan, 7... Rectifier tube, 9... Combustion tube, 11... Protection tube, 16... Small hole, 27...
Burner cover, 28...exhaust port, 101...heat receiving fin.

Claims (1)

[Claims] 1. Consisting of a rectifier tube having a large number of small holes and a combustion tube provided around the rectifier tube through a rectification space, and connected to a burner tube disposed laterally and one end of the burner tube. a vaporizer cylinder arranged horizontally and heated by a heater; a burner cover that closes the other end of the burner cylinder; and a burner cover arranged around the burner cylinder with an exhaust space in between, one end of which is closed by the burner cover. The vaporization tube includes a closed protection tube and an exhaust port opened in the protection tube near the vaporization tube so that exhaust gas flows in contact with the outer periphery of the vaporization tube, and the vaporization tube has a liquid fuel on its outer heat receiving surface. A liquid fuel combustion device that has a larger heat-receiving area at the bottom of the vaporizer cylinder than other types. 2. The liquid fuel combustion device according to claim 1, wherein the vaporizing cylinder is provided with heat receiving fins on the lower outer periphery. 3. The liquid fuel combustion apparatus according to claim 1, wherein the vaporizing cylinder is provided with heat receiving fins on the entire outer periphery, and the height of the heat receiving fin at the lower part of the vaporizing cylinder is higher than other heat receiving fins.