JPS63169415A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To shorten a preheat time and to reduce the size of a device, by a method wherein a combustion chamber is formed with a gap between a burner port cylinder and a heat collecting cylinder, a disc-like partition is situated to the upper part of the collecting cylinder, and a secondary air hole is formed in a level above a position facing the partition disc of the burner port cylinder. CONSTITUTION:Fuel fed to the bottom part of a combustion chamber 6 is evaporated by a bottom heated by means of an electric heater 2, and is raised while being, is mixed with a small amount of air fed through small bores 4a in the lower part of a burner port cylinder 4, and is burnt by means of secondary air fed through small bores 4b in the upper part of a burner port cylinder 4, and is burnt by means of secondary air fed through small bores 4b in the upper part of the burnr port cylinder 4. In this case, since the gas gasified on an evaporating surface is circumferentially made uniform due to resistance of a partition disc 3, and is raised to a combustion chamber 6, uniform combustion is created, and a part of the secondary air is mixed in the lower part of the combustion chamber 6 due to the partition disc 3 to effect blue flame combustion of excellent quality. The flame heats a collecting cylinder 1 through the holes of the burner port cylinder 4. Thus, since the temperature of the evaporating surface of the bottom part of the combustion chamber 6 is raised by heat conducted from the heat collecting cylinder 1, evaporation and combustion are continued by means of a self-heat. Further, since flame is formed in an internal direction, the diameter thereof is decreased, and the diameter of the combustion cylinder on the downstream side of the combustion chamber can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid fuel combustion device used in oil heaters and the like.

BACKGROUND OF THE INVENTION As shown in FIG. 2, this type of combustion apparatus has a flame hole plate 3 connected to the upper part of a vaporization chamber 1 made of aluminum alloy or the like in which an electric heater 2 is embedded, and a fuel pump 8 installed in the vaporization chamber 1. The fuel pumped by the fuel nozzle 7 is discharged from the electric heater 2.
, and the fuel gas vaporized on the wall surface of the vaporization chamber 1 heated by combustion heat and the air supplied from the blower 6 through the throat 5 are mixed and ejected from the opening 4 of the flame hole plate 3 for combustion. It is used.

Problems to be Solved by the Invention According to such conventional means, since the vaporization chamber is large, it takes a long time to heat the vaporization chamber to the fuel vaporization temperature. Since the combustion section is located above the vaporization chamber, it is difficult to heat the vaporization chamber with combustion heat, and it is necessary to heat the vaporization chamber even during combustion, resulting in high power consumption. Since the combustion flame is outward-inward, the diameter of the combustion chamber is large, making it difficult to downsize the combustion device. Since the fuel gas and air are mixed in advance in the vaporization chamber, there is a problem that if the mixing ratio of the fuel gas and air is inappropriate, the backfired flame will lift.

Means for Solving the Problems In order to solve these problems, the present invention includes a cylindrical heat-receiving tube with a built-in electric heater erected in the center of a flame hole tube with a large number of small holes, The combustion chamber is formed by the gap between the flame hole cylinder and the heat receiving cylinder, and the lower part of the heat receiving cylinder is extended in the outer circumferential direction to form a vaporization surface on the bottom of the combustion chamber, and a disc-shaped partition plate is provided in the upper part of the heat receiving cylinder in the outer circumferential direction. The structure is such that secondary air holes are densely bored at a position υ above the position facing the partition plate of the burner tube.

Function In the above configuration, the fuel supplied to the bottom of the combustion chamber is vaporized at the bottom heated by the electric heater, and rises while mixing with a small amount of air supplied from the small hole at the bottom of the flame hole tube. Combustion is carried out by secondary air supplied from the small hole at the top. At this time, the vaporized gas vaporized on the vaporization surface is made uniform in the circumferential direction by the resistance of the partition plate and rises into the combustion chamber, resulting in uniform combustion. This prevents yellow flame from being mixed in with the mixture and diffused combustion, resulting in high-quality blue flame combustion. Further, the flame heats a heat receiving tube that is formed upright inside the flame hole tube and is formed toward the inner circumferential direction from the small hole of the flame hole tube.

Therefore, during combustion, the temperature of the vaporization surface at the bottom of the combustion chamber increases due to heat conduction from the heat receiving cylinder heated by the combustion flame, so there is no need to supply electricity to the electric heater, and vaporization and combustion continue with self-heating. do. Further, since the flame is formed inward, the diameter of the flame becomes small, and the diameter of the combustion tube on the downstream side of the combustion chamber can be made small.

Example An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes a hollow cylindrical heat-receiving cylinder whose lower part extends in the outer circumferential direction to form a vaporizing surface 1a. 2 is an electric heater for heating the heat receiving cylinder. 3 is a partition plate which may be fixed to the upper part of the heat receiving cylinder 1 or may be integrated with the heat receiving cylinder 1. 4 is a flame hole tube with a small number of small holes 4a at the bottom and a large number of small holes 4b (secondary air holes) above the position facing the partition plate 3, and 5 is a flame hole tube provided on the outer peripheral side of the flame hole tube. The air chamber 6 is a combustion chamber formed by the gap between the heat receiving tube 1 and the flame hole tube 4. Reference numeral 7 denotes a temperature detector such as a thermocouple for detecting the temperature of the vaporization surface, and is fixed to the vaporization surface 1a.

A combustion nozzle 8 discharges the fuel supplied from the fuel pump 9 to the vaporization surface 1a. 10 is a blower for supplying air necessary for combustion, and 11 is a combustion tube provided on the downstream side of the combustion chamber 6.

In the above configuration, when the electric heater 2 is energized, the lower surface 1a
is heated. When the temperature of the vaporization surface reaches or exceeds the fuel vaporization temperature by a temperature detector 7 fixed to the vaporization surface 1a and a control circuit (not shown), the fuel pump 9 is activated to pump fuel from the fuel tank (not shown). The fuel is discharged to the vaporizing surface 1a through the fuel nozzle /L/8. At the same time, the blower 10 also operates, and the air passes through the air chamber 5 and the small holes 4 m and 2 drilled in the flame hole tube.
The air is supplied to the combustion chamber through the secondary air hole 4b. The fuel discharged to the vaporization surface 1a comes into contact with the high temperature surface, vaporizes, mixes with a small amount of air supplied from the small holes 4a, and rises.

At this time, the amount of air supplied from the four small holes is small compared to the vaporized gas, so it does not cause combustion. The fuel gas mixed with air rises and burns while being mixed and diffused with air supplied from the secondary air hole 4b formed in the upper part of the flame hole cylinder 4. If there is no partition plate 3, the vaporization on the vaporization surface 1m is not uniform, and uniform combustion cannot be obtained in the circumferential direction in the combustion chamber 6. The gas flows downward into the combustion chamber, resulting in a diffusion flame lacking air, which causes yellow flame and the generation of soot and CO.

According to the configuration of the present invention, since the gap between the partition plate 3 and the flame hole tube 4 is narrow, the pressure is applied and is made uniform in the circumferential direction, rising through the gap between the partition plate 3 and the flame hole tube 4, and increasing the pressure of the flame hole tube 4. Combustion occurs while forming a uniform flame while mixing and diffusing air supplied from the secondary air hole 4b drilled in the upper part, and the secondary air hole 4b of the flame hole tube is moved υ above the position facing the partition plate. By providing this, secondary air does not flow into the lower part of the combustion chamber 6, and a large amount of air is supplied to the upper part of the combustion chamber 6, where it is rapidly mixed and diffused, allowing for good combustion of blue flame.

Next, by supplying the air necessary for combustion from the outer circumferential side of the mixed gas, combustion occurs so that the air envelops the flame, so that the unburned gas in the flame does not come into direct contact with the flame hole tube or combustion tube. Even if the diameter of the flame is made smaller, combustion exhaust gas is less likely to deteriorate due to flame cooling.

Furthermore, as described above, according to the configuration of the present invention, the combustion flame is formed in the inner circumferential direction, and a heat receiving tube connected to the vaporizing surface is provided inside, so that during combustion, the fuel is vaporized by its own combustion heat and combusted. This eliminates the need to energize the electric heater, significantly reducing power consumption.
By making a part of the combustion chamber into a vaporization chamber, the vaporization chamber can be made smaller and the preheating time can be shortened.

Effects of the Invention As is clear from the above explanation, according to the combustion apparatus of the present invention, a heat receiving tube with a built-in electric heater is installed upright in the center of a flame hole tube having a large number of small holes. A combustion chamber is formed in the gap between the heat receiving tube and the lower part of the heat receiving tube is extended toward the outer circumference to form a vaporization surface, and a disk-shaped partition plate is provided at the top of the heat receiving tube, facing the partition plate of the flame hole tube. By providing the air holes in the secondary-2 which are densely drilled above the position, (1) the vaporization chamber is small and the combustion device can be downsized.

(2) Short start-up time.

(3) Low power consumption for vaporizing fuel during combustion.

2) The diameter of the combustion part is small, making it possible to make the combustion device smaller and thinner.

The following effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a liquid fuel combustion apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a conventional combustion apparatus. 1...Heat receiving tube, 2...Electric heater, 3
...Partition plate, 4...Flame hole tube, 4a...
...Small hole, 4b...Secondary air hole, 5...
...Air chamber, 6...Combustion chamber, 1a...
- Vaporization surface. Name of agent: Patent attorney Toshio Nakao and 1 other person/
--One tube 1o---One-stroke IZ@ This-Electric heating 3--Ishi Kirisaiban 2 Fig. 1 Between 4-flame mouth 4α, 4b-11 small 2L 6-Sakienori 1 Figure 2

Claims (1)

[Claims] A heat-receiving tube with a built-in electric heater is erected approximately in the center of a flame-hole tube with many small holes, a combustion chamber is formed in the gap between the flame-hole tube and the heat-receiving tube, and the lower part of the heat-receiving tube is Extending in the outer circumferential direction to form the bottom surface of the combustion chamber, a disk-shaped partition plate is provided in the upper part of the heat receiving tube toward the outer circumferential direction, and the flame hole tube is densely arranged above the position facing the partition plate. Arranged 2
Liquid fuel combustion device with secondary air holes.