JPS6337846B2 - - 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 burner made of a wire mesh or the like. It is related to.

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 inlet 5 and an air inlet 6, which are connected to a fuel pump 3 and a combustion fan 4, respectively, are opened in the side wall of a pot-shaped vaporizing cylinder 2 heated by a heater 1. Further, in the upper part of the vaporizing cylinder 2, there is a rectifying cylinder 7 provided with a large number of small holes, and a combustion cylinder 9 made of wire mesh is arranged around the rectifying cylinder 7 with a rectifying space 8 interposed therebetween. Further, an outer cylinder is provided around the combustion cylinder 9 with an exhaust space 10 in between. A throttle plate 13 that opens a mixture passage 12 is disposed at the upper opening of the vaporization tube 2, and a vaporization chamber 14 is defined by the vaporization tube 2, and a cap 17 that closes the rectifier tube 7 and its upper part. The mixing chamber 15 is divided by.
Further, 18 is a heat receiving flange integrated with the vaporizing cylinder 2. In the above configuration, the heater 1 is energized to heat the vaporization cylinder 2, and when the temperature reaches 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 inner wall of the heated vaporization cylinder 2, mixed with combustion air, and then transferred to the vaporization chamber 14.
The mixture enters the mixing chamber 15 through the air-fuel mixture passage 12 of the throttle plate 13. The air-fuel mixture that has entered the mixing chamber 15 is further mixed uniformly and enters the rectifying space 8 through the many small holes of the rectifying cylinder 7, and is also connected to an ignition device (not shown).
The combustion tube 9 is ignited and uniformly burns on the surface of the combustion tube 9, and the combustion tube 9 uniformly becomes red-hot due to the combustion heat and radiates radiant heat to its surroundings. Furthermore, when combustion occurs, the heat receiving flange 18 is heated by the radiant heat and high-temperature exhaust gas, and the recovered heat keeps the vaporizing tube 2 at a temperature sufficient to vaporize the liquid fuel. The power supply to is stopped.

However, in the conventional example described above, the heat receiving flange 18 that recovers combustion heat is separated from the bottom (vaporization surface) of the vaporization tube 2 that vaporizes the fuel, and the vaporization surface of the vaporization tube 2 that needs to be heated is heated. In order to do this, it is necessary to heat the entire vaporizing tube 2, which causes a large amount of heat dissipation and a lot of waste.In addition, due to the heat distribution between the heat receiving flange 18 and the vaporizing surface of the vaporizing tube 2, the vaporizing surface is kept at a predetermined temperature. In order to achieve the above, the heat receiving flange 18 had to be heated to an even higher temperature, which was undesirable from the viewpoint of the durability of the material. In addition, since the entire vaporizing cylinder 2 is heated, parts that should be kept at a low temperature, such as the fuel filler port 5, are likely to become hot, and the fuel filler port 5 after extinguishing the fire
The odor was caused by evaporation of fuel from the fuel. Furthermore, the heat receiving flange 18 is disposed on the outer periphery of the combustion tube 9, and has a relatively thick wall thickness in order to improve heat conduction to the vaporization tube 2, so it has a large heat capacity and is not required to energize the heater 1. Yotsutte vaporizer cylinder 2
This has the disadvantage that the preheating time required to heat the product to a predetermined temperature becomes long.

OBJECT OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional example, and improves the structure for recovering combustion heat to the carburetor.
The purpose is to prevent localized high temperatures, shorten preheating time, improve durability, and reduce odor, as well as maintain uniform red heat through uniform surface combustion in the combustion section.

Structure of the Invention In order to achieve this object, the present invention includes a vaporization cylinder having a liquid fuel supply means and a combustion air supply means, a burner connected to the vaporization cylinder, and a burner disposed on the outer periphery of the vaporization cylinder via an exhaust gas space. It comprises an exhaust gas pipe in which an exhaust port is partially opened, and a partition plate disposed on the way that the exhaust gas from the burner reaches the exhaust gas space, and the partition plate has a large opening area on the opposite side from the exhaust port. It is equipped with an exhaust gas flow port.

With this configuration, high-temperature exhaust gas flows in a concentrated manner through the partially opened exhaust port while contacting the outer peripheral surface of the carburetor cylinder, and at this time, the nearby vaporizer cylinder surface, that is, the vaporization surface portion, is strongly heated. , and other parts are kept at a relatively low temperature. In addition, because the exhaust ports are partially provided, the flow of exhaust gas in the burner becomes uneven, and the flow tends to be biased near the exhaust port, but the partition plate makes the flow of exhaust gas in the burner uniform, and This has the effect of maintaining a uniform red glow.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

In the figure, 50 is a vaporizer cylinder with a heater 5 inside.
1 is buried, and a combustion fan 54 is connected to one end of the combustion fan 54 via a blower tube 52. Further, a refueling nozzle 55 is arranged concentrically with the blower tube 52, with its tip facing the inner circumferential wall of the vaporizing tube 50, and connected to a refueling pump 56 via an oil supply pipe 53. At the opening of the blower tube 52 in the vaporizing tube 50, where the tip of the refueling nozzle 55 faces,
It holds a blower guide 58 that guides combustion air to the inner circumferential wall of the vaporization cylinder. Further, an exhaust gas pipe 59 is provided to encompass the vaporization pipe 50, and an exhaust port 60 opens therein, and an exhaust gas space 72 is formed between the vaporization pipe 50 and the exhaust gas pipe 59. On the other hand, at the other end of the vaporizing cylinder 50, a mixing plate 61 and a cylindrical rectifying cylinder 63 having a large number of small holes and forming a mixing chamber 62 inside are arranged, and a closing plate 64 is attached to the distal end surface of the rectifying cylinder 63. are doing. A rectifying space 65 is provided on the outer side of the concentric axis of the rectifying cylinder 63.
A combustion tube 66 made of wire mesh is disposed through the combustion tube 66. The closing plate 64 holds a protective cylinder 68 made of a material with good heat permeability such as glass on its outer peripheral surface, and forms a combustion space 69 between this and the combustion cylinder 66, and the other end of the outer cylinder 68 is It is connected to the exhaust gas cylinder 59. Further, in the vaporization cylinder 50, a liquid fuel vaporization surface 57 on the inner circumferential wall of the vaporization cylinder
The exhaust port 60 of the exhaust gas cylinder 59 is partially opened facing the outer circumferential wall 67 of the vaporizer cylinder corresponding to the part. On the other hand, in the exhaust gas passage from the combustion tube 66 to the exhaust port 60, the combustion tube 66 and the vaporization tube 50
A partition plate 70 is arranged at the connection part with the
The partition plate 70 has an exhaust port 6 as shown in FIG.
The exhaust gas flow port 71 is provided so that the opening area at the position opposite to 0 is large. That is,
Among the exhaust gas flow ports 71 provided around the entire circumference of the partition plate 70, the hole diameter of the exhaust gas flow port 71 located on the opposite side of the exhaust port 60 is increased.

Next, the operation will be explained. When the heater 51 is energized and the vaporization tube 50 is heated to a predetermined temperature, the combustion fan 54 is driven to supply combustion air into the vaporization tube 50 via the blower tube 52, and then the fuel pump 56 is driven. Liquid fuel is ejected from the tip of the fuel nozzle 55 into the vaporization cylinder. The air blowing guide 58 sends out fuel particles and combustion air so that the combustion air hits the vaporizing surface 57 . Vaporizer cylinder 50
Since the inside is in a high temperature state, the fuel particles are instantaneously vaporized and become vaporized gas, which is mixed with combustion air and guided to the front mixing chamber 62 as a premixed mixture.
The air-fuel mixture is rectified by passing through a large number of small holes provided in the rectifying tube 63, and further becomes a sufficiently rectified premixture in the minute gaps of the rectifying space 65, and is then released from the combustion surface of the combustion tube 66. It is ejected and ignited by an ignition device (not shown), forming a thin flame in the combustion tube 66 and performing surface combustion. High-temperature exhaust gas generated by combustion passes through the combustion space 69 and the exhaust gas space 72 and is discharged from the exhaust port 60. At this time, the outer circumferential surface of the vaporization tube 50 is heated to recover heat to the vaporization tube 50. It will be done. Here exhaust port 60
is partially opened facing the outer circumferential surface 67 of the vaporizer cylinder corresponding to the vaporization surface 57 portion of the inner circumferential wall of the vaporizer cylinder 50, so that the high temperature combustion exhaust gas is discharged through the exhaust port 6.
As a result, the vaporizer cylinder outer circumferential surface 67 facing thereon is heated strongly partially, and while the vaporizer surface 57 portion becomes high temperature, the other portions of the vaporizer cylinder 50 become relatively low temperature. It is maintained. Therefore, the entire vaporizer cylinder 50 does not reach a high temperature, reducing heat dissipation, and at the same time, the refueling nozzle 5
No. 5, the increase in heating temperature is small, and odor generation after extinguishing can be prevented, and there are few places where the temperature becomes high, so durability can be improved. Further, since there is no heat receiving flange as in the conventional example, the heat capacity of the vaporizing cylinder 50 is small, and the preheating time can be shortened.

On the other hand, the partition plate 70 disposed in the exhaust gas passage at the connection between the combustion tube 66 and the vaporization tube 50 has a large opening area on the opposite side to the partially provided exhaust port 60. Exhaust gas outlet 7
1, the flow of exhaust gas in the combustion tube 66, which tends to flow unevenly with respect to the exhaust port 60, is rectified and uniformly discharged from the combustion space 69. Therefore, strong local heating of the combustion tube 66 due to the uneven flow of exhaust gas in the combustion tube 66 can be prevented, and uniform heating, that is, uniform red heat can be obtained. Furthermore, deformation of the combustion tube 66 due to partial heating can be prevented, and deterioration of the durability of the material can be prevented.

In the above embodiment, the exhaust gas flow ports 71 with different hole diameters are opened in the partition plate 70, but the same effect can be obtained even if the partition plate 70 is arranged eccentrically as in another embodiment shown in FIG. .

Effects of the Invention According to the present invention, high-temperature exhaust gas from the burner is guided to the outer circumferential surface of the vaporizing cylinder, and the exhaust gas outlet is located at a portion opposite to the outer circumferential surface of the vaporizing cylinder corresponding to the vaporizing surface portion on the inner circumferential surface of the vaporizing cylinder. Because it is open,
Since the part necessary to vaporize the liquid fuel, that is, the vaporization surface, is heated intensively by the high-temperature combustion exhaust gas, partial cooling due to vaporization of the liquid fuel in the vaporization section is eliminated, and tar formation can be prevented. Instead, it becomes possible to maintain the vaporizer cylinder portion other than the vaporization surface portion at a relatively low temperature, thereby improving the durability of the material and preventing odor caused by fuel evaporation from the fuel supply nozzle. Further, since a heat receiving flange is unnecessary, the heat capacity of the vaporizer cylinder is small and the time required for preheating the vaporizer cylinder by the heater can be shortened.

In addition, the flow of exhaust gas in the combustion tube, which tends to flow unevenly toward the exhaust port, is rectified by the partition plate and is discharged uniformly from the combustion space, so the combustion tube is heated evenly and produces uniform red heat. Obtainable. Therefore, deformation of the combustion cylinder due to partial heating and deterioration of the durability of the material can be prevented. Furthermore, since the combustion space is kept warm by the partition plate, the combustion reaction is improved, and exhaust gas characteristics such as reduction in carbon monoxide emissions are improved.

[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 an embodiment of the liquid fuel combustion device according to the present invention, and FIG.
FIG. 4 is a cross-sectional view taken along the line A--A of the embodiment shown in the figure, and FIG. 4 is a cross-sectional view showing another embodiment. 50... Carburizer cylinder, 54... Combustion fan, 55...
...Refueling nozzle, 56...Refueling pump, 59...Exhaust gas cylinder, 60...Exhaust port, 63...Rectifier cylinder, 6
4...Closing plate, 66...Combustion tube, 68...Protection tube, 70...Partition plate, 71...Exhaust gas outlet, 7
2...Exhaust gas space.

Claims (1)

[Scope of Claims] 1. A vaporization cylinder having a liquid fuel supply means and a combustion air supply means, a burner connected to the vaporization cylinder, and an exhaust gas space disposed on the outer periphery of the vaporization cylinder through an exhaust gas space and partially exhausted. An exhaust gas distribution port comprising an exhaust gas cylinder with an opening and a partition plate disposed on the way that the exhaust gas from the burner reaches the exhaust gas space, and the partition plate has a large opening area on the opposite side from the exhaust port. A liquid fuel combustion device equipped with 2. The liquid fuel combustion device according to claim 1, wherein an exhaust gas flow port is provided around the entire circumference of the partition plate, and the hole diameter of the exhaust gas flow port on the opposite side to the exhaust port is increased. 3. The liquid fuel combustion device according to claim 1, wherein the partition plate is provided eccentrically with respect to the outer cylinder, and the gap between the outer cylinder and the outer periphery of the partition plate is larger on the side opposite to the exhaust port.