JPS63129210A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To reduce electric power consumption, by a method wherein a hollow cylindrical heat receiving tube is provided at the center of a flame port tube, on which a multitude of small holes is bored, and an electric heater is provided on the lower surface of the evaporating surface of the heat receiving tube while an air chamber and an air passageway are provided on the outer peripheral side and at the lower part of the flame port tube to supply air from the inner peripheral side of a combustion chamber. CONSTITUTION:When an electric heater 3 is conducted, an evaporating surface 1a is heated. When the temperature of the evaporating surface 1a has arrived at an evaporating temperature or higher, a fuel pump 9 is operated to discharge fuel onto the evaporating surface 1a at the bottom of a combustion chamber 6 through a fuel nozzle 8. At the same time, a fan 10 is operated and air is supplied into the combustion chamber 6 from an air outlet port 2a through small holes 4a, bored on a flame port tube 4, and air passageway 2 in the heat receiving tube. The fuel, discharged on the evaporating surface 1a, is contacted with the surface of a high temperature and is evaporated, then, is ascended while being mixed with the air, supplied through the small holes 4a at the lower part of the flame port tube 4. The ascended mixture gas is burnt while being mixed with and diffused into the air, supplied through the air outlet port 2a provided at the upper part of the heat receiving tube 1 and the small holes 4a at the upper part of the flame port tube 4. Accordingly, the fuel is burnt while evaporating itself by the combustion heat of itself upon combustion, and therefore, the conduction of current through the electric heater becomes unnecessary and electric power consumption may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a liquid fuel combustion device used in oil heaters and the like.

BACKGROUND OF THE INVENTION Conventionally, 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 bonder 8 installed in the vaporization chamber 1. The electric heater 2 discharges the pressure-fed fuel from the fuel nozzle 7,
A method in which the fuel gas is vaporized on the wall surface of the vaporization chamber 1 heated by combustion heat, and the vaporized fuel gas is premixed with air supplied from the blower 6 through the throat 5, and then ejected from the opening 4 of the flame hole plate 3 for combustion. is often 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 directed outward, the combustion chamber has a large diameter, making it difficult to downsize the combustion device.

Means for Solving the Problems In order to solve these problems, the present invention installs a hollow cylindrical heat receiving device upright in the center of a flame hole tube with a large number of small holes. A combustion chamber is formed in the gap between the cylinders, and the bottom of the combustion chamber is formed by extending the lower part of the heat-receiving cylinder to the outer periphery, and a disc-shaped electric heater is placed in close contact with the bottom of the combustion chamber. An air chamber is provided in the lower part of the bottom, and an air passage is provided from the cavity to the combustion chamber through the inside of the heat receiving cylinder.

Function In the above structure, the fuel supplied to the bottom of the combustion chamber is heated by the electric heater and is heated by the electric heater, and rises while mixing with the air supplied from the small hole at the bottom of the flame hole tube. It is combusted by air supplied from the small hole and the upper part of the heat receiving cylinder. At this time, static electricity is supplied to the vaporized gas mixed with static electricity in the upper part of the combustion chamber from the outer circumferential side through the small hole of the flame tube, and from the inside from the upper part of the heat receiving cylinder, so that the fuel gas and air are mixed. Good mixing promotes combustion.

Further, at this time, the flame is formed from the small hole of the flame hole cylinder toward the inner circumference, and heats the heat receiving cylinder that is erected inside. Therefore, during combustion, the temperature of the bottom surface of the combustion chamber rises due to heat conduction from the heat receiving tube heated by the combustion flame, so that there is no need to supply electricity to the electric heater, and vaporization and combustion continue using their own heat.

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 explained below based on the drawings.

In FIG. 1, reference numeral 1 denotes a hollow cylindrical heat-receiving cylinder having an air passage 2 and an air outlet 2a therein, and a lower part extending toward the outer periphery to form a vaporizing surface 1a. Reference numeral 3 denotes a disk-shaped electric heater that is in close contact with the bottom surface of the vaporizing surface 1a. Reference numeral 4 denotes a flame hole cylinder having a large number of small holes 4a, and numeral 5 denotes an air chamber provided on the outer circumferential side of the flame hole cylinder 4, which communicates with the lower part of the bottom surface of the flame hole cylinder 4. 6 is a combustion chamber formed by the gap between the heat receiving tube 1 and the flame hole tube 4; 7 is a temperature detector such as a thermocouple for detecting the temperature of the heat receiving tube, which is fixed to the lower part of the heat receiving tube. A fuel nozzle 8 discharges fuel supplied from a fuel pump 9 onto the electrified surface 1a. 10 is a blower for supplying air necessary for combustion, and 11 is a combustion tube provided downstream of the combustion chamber 6.

In the above configuration, when the electric heater 3 is energized, the vaporization surface 1s
is heated. When the temperature of the vaporization surface reaches or exceeds the vaporization temperature by a temperature detector 7 fixed to the lower part of the heat receiving tube 1 and a control circuit (not shown), the fuel pump 9 is activated to pump fuel from the fuel tank (not shown). Combustion chamber 6 via nozzle 8
is discharged onto the electrified surface 1a at the bottom of the electrified surface 1a. At the same time, the blower 10 also operates, and air is supplied into the combustion chamber 6 from the air outlet 2a via the small hole 4a formed in the flame hole tube and the static passage 2 in the heat receiving tube.

The fuel discharged to the vaporization surface 1a is completed when it comes into contact with the high temperature surface, and rises while mixing with the air supplied from the small hole 4a at the bottom of the flame tube 4. The rising mixed gas is mixed and diffused with air supplied from the upper small hole 4& and the air outlet 2a provided at the upper part of the heat receiving cylinder 1, and burns.

At this time, if the static electricity supplied to the mixed gas is only from the small hole 4a, the static electricity is not sufficiently supplied to the mixed gas near the center of the combustion chamber 6, resulting in an air-deficient combustion state, resulting in a yellow color due to diffuse combustion. Easy to cause fire.

According to the configuration of the present invention, the static outlet 2a in the center of the combustion chamber 6
Since air is also supplied from both the outer and inner circumferential sides of the mixed gas, the mixed gas is sufficiently mixed and diffused to achieve good combustion.

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, the combustion exhaust gas will not deteriorate due to flame cooling.

In addition, since the inside air is heated when passing through the inside of the heat receiving cylinder and is supplied to the combustion section, the combustion flame is not cooled down much, and the combustion reaction is promoted and the flame can be shortened.

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

Effects of the Invention As is clear from the above explanation, according to the combustion apparatus of the present invention, a hollow cylindrical heat receiving tube is provided in the center of a flame hole tube having a large number of small holes, and the lower part of the heat receiving tube is directed toward the outer circumference. A vaporization surface is formed at the bottom of the combustion chamber, and a disk-shaped electric heater is installed on the bottom of the vaporization surface, and a static chamber is provided on the outer periphery and the bottom of the flame tube, and combustion is carried out via an air chamber or heat receiving tube. By providing a static electricity path leading to the combustion chamber and supplying air from the inner circumferential side of the combustion chamber, (1) the vaporization chamber is small and the combustion device can be made smaller and more compact;

(2) The preheating time at startup is short.

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

(The diameter of the four combustion parts is small, and the combustion device can be made smaller and thinner, etc.).

[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 cylinder, 2...Air passage, 3.
...Electric heater, 4... Flame tube, 4a.
...Small hole, 5...Air chamber, 6...
・Combustion chamber. Name of agent: Patent attorney Toshio Nakao and 1 other person! −
--What is the air passage? ζ--Empty inlet/outlet 3--Electric heat Δ-Fukashi master figure 2

Claims (1)

[Claims] A hollow cylindrical heat-receiving tube is erected approximately in the center of a flame-hole tube with a large number of 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 extended toward the outer periphery. A gasification surface is formed on the bottom surface of the combustion chamber, and a disk-shaped electric heater is provided on the bottom surface of the gasification surface, and an air chamber is provided on the outer circumferential side of the flame hole tube and at the bottom of the gasification surface, and the heat receiving surface is provided. A liquid fuel combustion device that has an air passage in the cylinder that leads from the air chamber to the combustion chamber.