JPS5918308A - Combustion device of liquid fuel - Google Patents

Abstract

PURPOSE:To facilitate the evaporation of liquid fuel and to suppress the development of tar, while at the same time ensuring the liquid fuel to burn uniformly, by providing a baffle plate at the opening of throttle board partitioning an evaporating chamber and a mixing chamber. CONSTITUTION:Upon the mixture of liquid fuel and combustion air being introduced into an evaporating chamber 14, the liquid fuel is evaporated in contact with an evaporating wall having an elevayed temperature, which takes place at an accelerated speed under the assistance of combustion air flowed from an air suction port 6 opened adjacent the evaporating wall and oriented to the direction parallel to the pivoting direction. A circulating flow occuring in the evaporating chamber 14 further facilitates the mixture of evaporated gas with the combustion air. A fuel-air mixture entering into the opening 12 of throttle board 13 through the evaporating chamber is introduced into a mixing chamber 15 with its circulating flow converted into a straight-advancing flow by means of a baffle plate having its rotary blade adapted to rotate in the reverse direction. Then, the fuel-air mixture is injected out of a small port 16 defined in a smoothing cylinder 7 with an uniformly distributed wind velocity, and burnt uniformly on the surface of combustion cylinder 9. In this manner, it is possible for the titled device to facilitate the evaporated of liquid fuel and to suppress the development of tar.

Description

[Detailed description of the invention] Industrial applications The present invention is for vaporizing and burning liquid fuel.

The present invention relates to a fuel combustion device that mixes air with air and performs combustion in all combustion tubes.

The structure of a conventional example and its problems A conventional liquid fuel combustion apparatus of this type is shown in FIG. 1 and will be explained. A fuel pump 3. A fuel inlet 5 and an air inlet 6 connected to the combustion fan 4 are open. Further, in the upper part of the vaporizing cylinder 2, a rectifying cylinder 7 having a large number of small holes 16 is provided, and a combustion cylinder 9 made of wire gauze is arranged around the rectifying cylinder 7 with a rectifying 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 having an opening 12 is disposed at the upper opening of the vaporization tube 2, and the vaporization chamber 14 is entirely partitioned by the vaporization tube 2, and is also connected to the rectification tube 7 for mixing. All 15 spaces are divided. In the above configuration, when the heater 1 is energized and the vaporization tube 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 mixed uniformly and enters the rectifying space 8 through the many small holes 16 of the rectifier tube 7, and is ignited by an ignition device (not shown) to reach the surface of the combustion tube 9. to perform combustion. However, in the conventional example described above, since the fuel inlet 5 and the air inlet 6 are arranged in the same location in the diametrical direction of the vaporization tube 2, the supplied combustion air flow does not reach the vaporization wall portion where the liquid fuel is vaporized. It had reached a stagnation point and the sweet air flow rate had slowed down. Therefore, the partial pressure of vaporized fuel vapor in the vaporization part is lowered by air flow,
The scavenging effect for promoting vaporization was small, and tar was easily generated during vaporization.

In order to completely improve the above-mentioned two drawbacks, we also considered the configuration shown in FIG. In the configuration shown in FIG. 2, the air supply port 6 opens near the vaporization wall where the liquid fuel is vaporized, and also opens in the swirling direction so that the airflow flows along the vaporization wall. Reference numeral 17 is a cooling air pipe that completely bypasses the fuel filler port 5. However, in the configuration shown in Figure 2,
Although the scavenging effect in the vaporization chamber 14 promoted vaporization and suppressed tar, the air-fuel mixture discharged into the mixing chamber 15 through the opening 12 of the throttle plate 13 became a swirling flow. Therefore, due to the swirling force, the air-fuel mixture entering the mixing chamber 15 exhibits the entire wind speed distribution shown in A in FIG. Uniform combustion over the entire surface of the cylinder 9 was no longer possible. As a result, the red heat of the wire mesh becomes uneven due to surface combustion, and the durability of the material decreases due to localized high temperatures.
There were drawbacks such as partial incomplete combustion due to non-uniform combustion and deformation due to non-uniform thermal strain.

Purpose of the Invention The present invention also solves the drawbacks of the second conventional example,
This is to ensure stable combustion.

Structure of the Invention In order to achieve all of the above objects, by disposing all rectifying plates in the openings of the aperture plates that partition the vaporization chamber and the mixing chamber, vaporization is promoted in the vaporization chamber by the swirling flow of combustion air.・In addition to suppressing tar, the air mixture discharged into the mixing chamber is made into a straight forward flow by a rectifying plate installed at the opening of the diaphragm plate, which equalizes the air velocity distribution of the air mixture in the mixing chamber to achieve uniform combustion. be.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will now be described as shown in FIG. Components in the drawings that are the same as those in FIGS. 1 and 2 are designated by the same numbers, and their explanations will be omitted.

Opening 1 of the aperture plate 13 disposed at the upper outlet of the vaporization cylinder 2
2 is provided with a rectifying plate 18. The baffle plate 18 causes the swirling flow of the air-fuel mixture in the vaporization chamber 14 to become a straight flow at the outlet of the opening 12.

It has swirling vanes in a direction opposite to the swirling direction of the air-fuel mixture in the vaporization chamber 14. In the above configuration, when liquid fuel and combustion air are supplied to the vaporization chamber 14, the liquid fuel is vaporized by the heated vaporization wall, and the gasification chamber 14 is opened near the vaporization wall and provided in the swirling direction. The combustion air flow from the air supply port 6 causes prompt vaporization, which not only completely prevents the generation of tar, but also promotes mixing of the vaporized gas and combustion air by the swirling flow in the vaporization chamber 14.

The air-fuel mixture entering the opening 12 of the diaphragm plate 13 from the vaporizing chamber 14 changes from a swirling flow to a straight flow by a swirling vane type baffle plate in the opposite direction and enters the mixing chamber 16 .

The straight-flowing air-fuel mixture has a uniform wind velocity distribution as shown by OB in FIG. 3, is discharged from the small holes 16 of the rectifier tube 7, and is uniformly combusted on the surface of the combustion tube 9.

Next, another embodiment of the present invention is shown in FIG. 4 and will be described. A burner base 21 is in contact with the bottom surface of the vaporization cylinder 2 heated by the heater 1, and an air chamber 22 is formed by the bottom surface of the vaporization cylinder 2.

In addition, an air supply port 23 and a nozzle port 24 are opened at the bottom of the carburetor cylinder to communicate with the air chamber 22. A wind direction plate 25 is provided that blows air into the vaporization chamber 14 inside the vaporization cylinder 2 in a swirling direction. Furthermore, an oil supply pipe 26 connected to the oil supply pump 3 is opened at the nozzle port 24.

The second part of the vaporizing cylinder 2 includes a diaphragm plate 13 having a rectifying plate 18 in the opening 12 as shown in FIG. is installed. Exhaust space 1 between combustion tube 9 and protection tube 11
The upper part of o is closed by a burner cover 27. The protection member 11 is supported by a support tube that is integral with the burner base 21 and has an exhaust port 28 on its side wall. 30
．． 31 are long screws and nuts for assembling the combustion device. In the above configuration, when the vaporization cylinder 2 reaches a predetermined temperature 1, the fuel pump 3 and the combustion fan 4 are activated, and the liquid fuel is supplied to the vaporization chamber 14 through the entire fuel supply pipe 26, and the heated vaporization cylinder is heated. 2 At the same time as the combustion air is vaporized on the inner wall, it passes from the air chamber 22 through the air supply port 23 to the wind direction plate 25.
The gas is rotated and spouted into the vaporization chamber 14 by the following. The swirling combustion air flows along the inner wall of the vaporization cylinder 2, promotes the complete vaporization of the liquid fuel on the vaporization wall, and mixes with the vaporized gas. The air-fuel mixture forming a swirling flow in the vaporization chamber 14 is provided in the opening 12 of the throttle plate 13, and is rotated in the opposite direction to the swirling flow.
The opening 1 is
At the second outlet, the flow becomes a straight flow and flows into the mixing chamber 15.

The air-fuel mixture, which has been further evenly mixed in the mixing chamber 15 and has a uniform wind speed distribution, flows out from the small hole 16 of the straightening tube 7 and flows into the combustion tube 9.
Burning takes place on the surface of the The high-temperature exhaust gas after combustion flows downward and completely heats the carburetor cylinder 2, and then is discharged from the exhaust port 28 provided in the support cylinder 29. In this configuration,
Since heat recovery from the exhaust gas to the vaporizer cylinder 2 can be obtained extremely easily, the heater 1 that heats the vaporizer cylinder 2 is only energized during the light period of operation, and is heated by combustion heat during operation.
There is no need for energization and it can be used simultaneously.

Effects of the Invention As can be seen from the above description, according to the present invention, a rectifying plate for converting the inlet flow of the air-fuel mixture into a straight flow is provided at the opening of the throttle plate disposed at the outlet of the vaporization chamber. By doing so, the combustion air is swirled in the vaporization chamber to fully promote the vaporization of the liquid fuel and completely prevent tar formation, and at the same time, it is possible to completely prevent uneven combustion in the combustion tube, and to prevent the formation of partial high temperatures in the combustion tube. It is possible to prevent deterioration in the durability of the material due to aging, to prevent partial incomplete combustion, and to prevent deformation caused by non-uniform thermal strain. In the description of the above embodiment, if the current plate is a swirling vane gold film girder that causes the air-fuel mixture to swirl in the opposite direction to the swirling direction of the air-fuel mixture in the vaporization chamber, but has a sufficient distance to make the air-fuel mixture flow in a straight line, For example, a plurality of fins may be provided parallel to the central axis of the vaporizer tube.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing a conventional liquid fuel combustion device;
The figure is a vertical cross-sectional view showing another conventional liquid fuel combustion device.
The figure is a longitudinal cross-sectional view showing one embodiment of the liquid fuel combustion device of the present invention, and FIG. 4 is a longitudinal cross-sectional view showing another embodiment of the present invention. ...Fuel bonder, 4
...Combustion fan, 12...Opening,...
13. River... Aperture plate, 9... Combustion tube, 18...
... Rectifier plate, 25... Wind direction plate. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) A vaporizer tube that vaporizes the supplied liquid fuel into vaporized gas, a combustion fan that supplies combustion air in the swirling direction into the vaporizer tube, and a combustion fan disposed at the outlet of the vaporizer tube to convert the vaporized gas into vaporized gas. and a combustion tube connected to the vaporization tube-outlet, the mixture discharged from the opening of the throttle plate is a substantially straight flow. A liquid fuel combustion device with a rectifying plate installed in the same opening. (2) The liquid fuel combustion apparatus according to claim 1, wherein the baffle plate is provided with a swirling vane having a swirling direction opposite to the swirling direction of the combustion air in the vaporization cylinder. (3) The liquid fuel combustion device according to claim 1, wherein the baffle plate has a plurality of fins parallel to the central axis of the vaporization tube.