JPH0129380Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention involves injecting liquid fuel into a vaporization section heated to a high temperature, vaporizing it, and premixing it with the blown combustion air. The present invention relates to a vaporizing liquid fuel burner that burns with

[Conventional technology]

A combustion burner of this type is shown in FIG.

In Fig. 1, reference numeral 1 denotes a vaporizing section, which consists of a small cylindrical chamber made of a metal with good heat conductivity such as aluminum or brass. The nozzles 3 are connected to each other. Further, the upper part of the vaporizing section 1 is divided by a mixing plate 4 having a small hole 4a in the center, and the mixing plate 4 is fixed to the upper wall of the vaporizing section 1 with screws 5. Further, an electric heater 6 is embedded in the vaporizing section 1, and heats the vaporizing section 1 to a constant temperature. Reference numeral 7 denotes a current plate, which is provided above the mixing plate 4. Reference numeral 8 denotes a combustion plate, which is fixed to the mixing plate 4 with a nut 9 via a combustion plate retainer 10. Reference numeral 11 denotes a temperature sensor that detects the temperature of the vaporizing section 1. Next, the operation will be explained with reference to FIG.

Fig. 2 shows an example of a combustion device using a conventional fuel burner, in which 12 is a blower, 13 is a pressurizing solenoid valve, 14 is an oil level regulator, 15 is a fuel pump, 16 is an oil pan, and 17 is a cartridge. It's a tank. First, the electric heater 6 is energized to heat the vaporizer 1 to a predetermined temperature. Then, the blower 12 and fuel pump 15 start operating in response to a signal from the temperature sensor 11, and pre-purge is performed for a certain period of time. After the pre-purge is completed, the pressurizing solenoid valve 13 opens, and the fuel is pushed out from the oil level regulator 14 and ejected from the fuel injection needle 2. At this time, there is a high-speed air flow inside the nozzle 3, and the ejected fuel is atomized by this air flow, collides with the air flow against the inner wall of the high-temperature vaporizing section 1, and is vaporized in an extremely short time. The vaporized fuel mixes with the air simultaneously blown into the vaporization section 1 to form a premixed mixture, which passes through the small holes 4a of the mixing plate 4 and is ignited on the combustion plate 8 to be combusted.

Here, in the conventional burner, the mixing plate 4 was fixed to the vaporizing part 1 with screws 5, but due to deformation of the mixing plate 4 or poor processing of the contact surface of the vaporizing part 1 with the mixing plate 4, etc. , the airtightness of the contact surface of the mixing plate 4 was not maintained sufficiently. For this reason, there was a problem in that a high concentration of vaporized fuel leaked from this contact surface, particularly on the fuel injection surface side, and the flame locally became a yellow flame. This is because most of the fuel injected into the vaporization section 1 is vaporized at the moment it collides with the vaporization section 1, but some of it is not completely vaporized and is scattered in all directions. This scattered fuel is dispersed upward along with the wind as minute droplets, and hits the mixing plate 4 and bounces off, or is vaporized on the mixing plate 4. However, as described above, if there is a gap between the contact surface between the mixing plate 4 and the vaporizing section 1, the scattered fuel will leak from the gap and will be ejected at a high concentration, resulting in a yellow flame.

[Summary of the idea]

The present invention was developed to solve the above-mentioned problems, and by installing a fuel reflector in the vaporization section at the bottom of the mixing plate, highly concentrated fuel can be prevented from leaking through the gap between the contact surfaces of the mixing plate. The present invention provides a vaporizing liquid fuel burner that is capable of stable combustion while preventing emissions.

[Example of idea]

FIG. 3, which is an embodiment of the present invention, will be explained below.

In FIG. 3, reference numeral 18 denotes a reflecting plate disposed above the vaporizing section 1 and directly below the mixing plate 4, and is in close contact with the inner wall of the vaporizing section 1. The reflection plate 18 has a ring shape with an L-shaped cross section, and has one side in contact with the inner wall of the vaporizing section 1 and the other side rising perpendicularly from the inner wall of the vaporizing section 1 . The material of the reflection plate 18 is the same as that of the vaporizer 1 to prevent the generation of gaps due to thermal expansion.

Since the other parts are the same as those in FIG. 1, the same reference numerals are given and the explanation will be omitted.

In the embodiment of the present invention described above, since the reflector plate 18 is disposed above the vaporizer 1, the vaporizer 1
The fuel that collides with the inner wall of the vaporizer and scatters is reflected by the reflector, falls downward, and vaporizes on the bottom surface of the vaporizer 1. Therefore, since the fuel droplets do not directly hit the mixing plate 4, even if there is a gap in the contact surface of the mixing plate 4, high concentration fuel will not leak directly and the preset concentration will not be exceeded. A blue flame occurs because the air-fuel mixture leaks.

Further, since the influence of processing accuracy and deformation of the mixing plate 4 can be alleviated, an inexpensive and stable device can be obtained.

In the above embodiment, a ring-shaped reflector with an L-shaped cross section was used as the reflector.
A similar protrusion may be provided on the.

Alternatively, it may simply be a flat ring, and in this case, it is preferable to fix it by welding or the like in order to improve heat conduction with the vaporization part 1.

[Effect of idea]

As described above, according to the present invention, since the fuel reflection plate is provided above the vaporization section directly below the mixing plate, the tolerance range for the gap between the contact surface between the mixing plate and the vaporization section is widened, and relatively rough machining is possible. This has the effect of providing an inexpensive vaporizing liquid fuel burner with acceptable accuracy and stable performance.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional vaporizing liquid fuel burner, Fig. 2 is a configuration diagram showing an example of a combustion device to which this is applied, and Fig. 3 is an embodiment of a vaporizing liquid fuel burner according to the present invention. FIG. In the figure, 1 is a vaporizing section, 3 is a nozzle section, 4 is a mixing plate, and 18 is a reflecting plate. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a vaporizing liquid fuel burner having a nozzle portion that spouts liquid fuel, a vaporizing portion that vaporizes the liquid fuel jetted from the nozzle portion, and a mixing plate that partitions the vaporizing portion, the vaporizing portion immediately below the mixing plate. A vaporizing liquid fuel burner characterized by being equipped with a reflector for fuel that is scattered.