JPH01247908A - Vaporizing combustion device - Google Patents

Abstract

PURPOSE:To heat a vaporizing cylinder evenly and rapidly so as to shorten the time for ignition and suppress the generation of offensive odor and white fumes so as to improve the ignitability by setting sheathed heaters in the vaporizing cylinder at its upper and lower parts as means of heating it. CONSTITUTION:When a vaporizing cylinder 1 has been heated to a prescribed temperature by two sheathed heaters 2a, 2b, a blower 9 starts to send air for combustion into a vaporizing cylinder 1 through an air duct 7 and an inlet 8. On the other hand, a fuel pump 11 also starts to send fuel through a feed tube 12 and eject it into the vaporizing cylinder 1 from the tip of a nozzle 10. The fuel is vaporized at the sidewalls of the heated vaporizing cylinder 1 and, after mixed with air for combustion, sent to a flame stabilizing plate 3 and ejected from flame holes 4. This mixture is ignited by spark discharge between electrodes 5, forming a flame 6. With the sheathed heater 2b embedded in the lower part of the vaporizing cylinder, the bottom of the vaporizing cylinder 1 is heated to a high temperature even when the discharge pressure of the fuel pump 11 is low, so that the fuel is vaporized instantaneously and pulsating combustion does not occur. The flame stabilizing plate 3 is heated by the sheathed heater 2a, so that the time for ignition is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vaporizing combustion device such as a kerosene fan heater.

Conventional technology A conventional evaporative combustion device is shown in Fig. 2.

In FIG. 2, reference numeral 14 denotes a bottomed cylindrical vaporization cylinder for vaporizing liquid fuel, in which a sheathed heater 15 is embedded. Reference numeral 16 denotes a flame-holding plate in the shape of a ceiling cylinder installed at the upper opening of the vaporizing cylinder 14, and has flame holes 17 on the entire circumferential side surface. 18 is an ignition electrode for igniting the fuel-air mixed gas ejected from the flame hole 17; 19 is a flame of the flame hole 17; Reference numeral 20 denotes a blower pipe for sending combustion air into the inside of the carburetor 14, and an air port 21 at the tip is fixed to the side surface of the carburetor 14.

Reference numeral 22 denotes a fuel injection nozzle that is disposed through the inside of the blast pipe 20 and faces the inside of the vaporization cylinder 14.

Further, 23 is a fuel pump for supplying fuel, which communicates with an oil feed pipe 24 and a fuel injection nozzle/I/22.

25 is a blower for supplying combustion air, and the blower pipe 2
0 and the air port 21.

The operation of the vaporization type combustion apparatus configured as above will be explained.

First, when the vaporization cylinder 14 is heated to a predetermined temperature by the sheathed heater 15, combustion air is supplied into the vaporization cylinder 14 from the air port 21 by the blower 25. On the other hand, fuel is injected into the carburetor cylinder 14 from the C nozzle 1/22 by the fuel pump 23. The liquid fuel injected into the vaporization cylinder 14 is vaporized on the heated wall of the vaporization cylinder 14, mixed with combustion air, and then 1. It is guided into the flame holding plate 16. The fuel-air mixture gas ejected from the °C1 flame hole 17 is then ignited by a spark discharge from the ignition electrode 18, and a flame 19 is formed in the flame hole 17.

Problems to be Solved by the Invention However, in the conventional configuration as described above, the nozzle/L/
Most of the fuel ejected from 22 collides with the side surface inside the vaporization tube 14 and vaporizes there, but some fuel collides with the bottom surface inside the vaporization tube 14 and vaporizes there.

In other words, the pump discharge pressure changes due to fluctuations in the pump flow rate, and when the discharge pressure is high, the fuel particles collide with the side of the vaporization cylinder 14 as shown in A, and most of them are vaporized there, but when the discharge pressure is low, the fuel particles Due to assembly variations during installation, fuel particles collide with the bottom surface of the carburetor cylinder 14 as shown in B, and are vaporized on this bottom surface. For this reason, the sheathed heater 15
There is a time delay in vaporization at the bottom of the vaporizer cylinder, which is relatively low temperature, compared to the nearby high-temperature side surface, resulting in pulsating combustion in which the concentration of the mixed gas changes periodically during low-calorie combustion with low discharge pressure. It became. Therefore, there was a problem in that the flame changed greatly from a lifted state due to excess air to a yellowish state due to insufficient air, resulting in odor, nuisance, CO, etc. However, because the sheathed heater 16 for heating the vaporization cylinder was buried in the relatively upper side of the vaporization cylinder at 10°C, the vaporization cylinder 14 was heated only locally. therefore,
When the combustion device is first operated, the side surface of the vaporization tube 14 that the fuel particles collide with reaches a predetermined temperature, and the fuel-air mixture gas 7
It takes a relatively long time to ignite (ignition time). Furthermore, the mixed gas vaporized inside the vaporization tube 14 is cooled when it passes through the central opening 16a of the flame stabilizing plate 16 and is ejected from the flame hole 17 on the side. Therefore, when the mixed gas ejected from the flame hole 17 is ignited, a part of it condenses at the flame hole, and it is not ignited instantly and unburned gas is generated, which can cause odor and white smoke. , the ignition performance was poor.

The present invention solves such conventional problems by realizing a stable mixed gas concentration in a wide range of combustion conditions from large flow rates to small flow rates, eliminating periodic incomplete combustion, and Yellow fire, odor, sunu.

The purpose of this invention is to prevent the generation of CO, etc., shorten the ignition time by uniformly and quickly heating the vaporizer cylinder, and improve the ignition performance of the combustion device.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention installs sheathed heaters for heating the vaporization cylinder at the top and bottom of the vaporization cylinder, and also heats the burner section with the sheathed heater at the top. be.

Operation According to the present invention, with the above configuration, all the fuel ejected from the nozzle collides with the high temperature part of the vaporizer cylinder and is instantaneously vaporized, thereby eliminating pulsating combustion as shown in the conventional example. Therefore, periodic concentration changes in the fuel-air mixture do not occur;
The generation of yellow fire, odor, smoke, CO, etc. is reduced. Talented,
The vaporizing tube and flame holding plate are heated evenly and quickly, the ignition time is shortened, and there is no condensation at the flame hole of the mixed gas, reducing odor and white smoke generation, improving ignition performance. Significantly improved.

EXAMPLE Hereinafter, an example of the vaporization type combustion apparatus of the present invention will be described with reference to FIG. In FIG. 1, 1 is a vaporization cylinder for vaporizing liquid fuel, and sheathed heaters 2a and 2b are embedded in the upper and lower sides of the vaporization cylinder, and the two sheathed heaters are connected in parallel. . Further, a portion of the sheathed heater 2a is exposed from the upper surface of the vaporization cylinder 1. Reference numeral 3 denotes a flame-holding plate for burning a mixed gas of vaporized fuel and combustion air, which constitutes a burner section, and a large number of flame holes 4 are evenly provided on the circumferential side of the plate. The flame stabilizing plate 3 is heated by bringing the bottom outer periphery into contact with the sheathed heater 2a. 5 is an ignition electrode for igniting the mixed gas ejected from the flame hole 4; 6 is a flame in the flame hole 4; Reference numeral 7 denotes a blower tube for sending combustion air into the carburetor tube 1. An air port 8 at the tip thereof is fixed to the side surface of the vaporizer tube 1, and the other end communicates with a blower 9. Reference numeral 10 designates a nozzle for injecting fuel into the interior of the carburetor cylinder 1, which is fixed at the center of the side surface of the carburetor cylinder 1, and the other side communicates with a fuel pump 11 and an oil feed pipe 12.

The operation of the vaporization type combustion apparatus having the above configuration will be explained.

First, the vaporizing cylinder 1 is connected to two sheathed heaters 2 a and (J:
When the combustion air is heated to a predetermined temperature (temperature that allows vaporization) by 2b, the blower 9 is driven and the combustion air is sent through the air pipe 7 and into the vaporization cylinder 1 from the air port 8. On the other hand, the fuel pump 11 is also driven, and fuel passes through the oil pipe 12 to the nozzle 1.
0 is ejected from the tip into the vaporizer cylinder 1. The liquid fuel injected into the vaporization cylinder 1 is vaporized on the heated side wall surface of the vaporization cylinder 1, mixed with combustion air, and then sent to the flame stabilizing plate 3 and ejected from the flame hole 4. This mixed gas is then ignited by spark discharge from the ignition electrode 5 to form a flame 6. Here, the liquid fuel injected from the tip of the Kuzu/l/10 into the vaporizer cylinder 1 is exactly the same as that of the conventional one, as shown in FIG. However, since the sheathed heaters 2a and 2b for heating the carburetor cylinder 1 are buried above and below the conventional side surface of the carburetor cylinder and are connected in parallel, the discharge pressure of the fuel pump 11 is Even when the temperature is low, that is, when fuel particles collide with the bottom surface of the vaporization tube 1 and are vaporized as shown in B, the temperature at the bottom surface of the vaporization tube 1 is higher than that of the conventional one, and the fuel vaporizes instantaneously. The pulsating combustion seen in the conventional example is eliminated. Therefore, the generation of C yellow flame, odor, soot, CO, etc. is reduced. In addition, the vaporizer cylinder 1 and flame holding plate 3 are heated uniformly and quickly, and in particular, the flame holding plate 3 is also heated by the sheathed heater 2a, so the ignition time is reduced to 1/2 to 2/3 of that of the conventional one. In addition, dew condensation at the flame hole of the mixed gas is eliminated, the generation of odor and white smoke is reduced, and the ignition performance is significantly improved.

Effects of the Invention As described above, in the present invention, by embedding the sheathed heater in the upper and lower parts of the vaporization cylinder, all the fuel injected into the vaporization cylinder from the nozzle collides with the high temperature part of the vaporization cylinder and is instantly vaporized. be able to. Therefore, the time delay in vaporization and periodic pulsating combustion are eliminated, and the generation of yellow flame, odor, soot, CO, etc. is significantly reduced. The vaporizer cylinder and flame holding plate are heated uniformly and quickly. Therefore, the ignition time is shortened, and there is no dew condensation at the flame hole of the mixed gas, so the generation of odor and white smoke is reduced, and the ignition performance can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a vaporization type combustion apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1... Carburizer cylinder, 2a... Sheathed heater 1.2b... Sheathed heater. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] It is equipped with a vaporization cylinder that vaporizes liquid fuel, a burner section attached to the upper opening of the vaporization cylinder, and a fuel injection nozzle facing the side of the vaporization cylinder. This is a vaporization type combustion device that has a heater buried in it and also heats the burner section using a sheathed heater located above.