JPS63129211A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To reduce electric power consumption, by a method wherein the title device is provided with a flame port tube, having a multitude of small holes bored on the outer peripheral side of a cylindrical heating chamber including an electric heater, an air chamber, provided on the outer peripheral side of the flame port tube, and an air passageway, provided from the air chamber to a combustion chamber through a heating chamber, in order to supply high-temperature hot air into an evaporating unit. CONSTITUTION:When an electric heater 2 is conducted, a heating chamber 1 is heated through a heating space 3 and the temperature of the bottom surface of a combustion chamber 6 is risen. When the temperature of an evaporating unit has arrived at a temperature higher than the evaporating temperature of fuel, a fuel pump 9 is operated to inject the fuel into the evaporating unit at the bottom of the combustion chamber 6 through a fuel nozzle 8. At the same time, a fan 10 is operated and air is sent into a heating space 3 through the small holes 1a bored on the heating chamber 1, then, the air is supplied into the evaporating unit through small holes 1b as high-temperature airflow. Simultaneously, the air is supplied into the combustion chamber 6 through the small holes 4a provided on a flame port tube 4. Evaporated gas is ascended while being mixed with the hot air, supplied through the small holes 1b and the small holes 4a at the lower part of the flame port tube 4, then, is burnt while being mixed with and diffused into the air supplied through the small holes 4a. In this case, combustion flame is formed from the small holes 4a toward the inside of the heating chamber thereby heating the heating chamber.

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 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 connected to the vaporization chamber 1. The pressure-fed fuel is discharged from the fuel nozzle 7 and vaporized by the electric heater 2 and the wall surface of the vaporization chamber 1 heated by combustion heat, and the vaporized fuel gas and air supplied from the blower 6 through the throat 5 are premixed. A configuration in which combustion is performed by ejecting from the opening 4 of the flame hole plate 3 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 a problem that power consumption increases.

Means for Solving the Problems In order to solve these problems, the present invention further includes a bottomed cylindrical flame hole tube in which a large number of small holes are bored on the outer circumferential side of a heating chamber containing an electric heater. An air chamber is provided on the outer periphery of the flame tube, and a small hole is bored at the bottom of the heating chamber to communicate the heating chamber and the air chamber, as well as the heating chamber and the combustion chamber.An air passageway connects the air chamber through the heating chamber to the combustion chamber. This configuration has the following features:

Function In the above configuration, the fuel supplied to the bottom of the combustion chamber is vaporized on the wall surface of the heating chamber heated by the electric heater and the surface of the flame hole tube, and is combined with the air supplied from the flame hole tube and the small hole at the bottom of the heating chamber. It rises while mixing and is combusted by air supplied from the small holes at the top of the flame tube. The air supplied from the air chamber to the combustion chamber through the heating chamber is heated to a high temperature and supplied to the fuel vaporization section, which reduces the partial pressure of vaporized gas on the surface of the vaporization section and promotes vaporization without cooling the vaporization section. effective.

At this time, the flame is formed in the inner circumferential direction of the flame hole and heats the heating chamber vertically installed inside. Therefore, during combustion, the heating chamber is heated by the heat of combustion, so there is no need to energize the electric heater, and vaporization and combustion continue using self-heating.

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 heating chamber having a small hole 1a communicating with an air chamber 5 and a small hole 1b communicating with a combustion chamber 6 at its lower part.

Reference numeral 2 designates an electric connection for heating the heating chamber 1, and reference numeral 3 designates a heating space provided within the heating chamber. Reference numeral 4 denotes a flame hole tube having a large number of small holes 4a, and 5 an air chamber provided on the outer circumferential side of the flame hole tube. 6 is a combustion chamber formed by the gap between the heating chamber 1 and the flame hole cylinder 4. Reference numeral 7 denotes a temperature detector such as a thermocouple for detecting the temperature of the vaporization section, and is fixed to the bottom of the combustion chamber 6. A fuel nozzle 8 discharges fuel supplied from a fuel pump 9 to a vaporization section at the bottom of the combustion chamber 6. 10 is a blower for supplying air necessary for combustion.

In the above configuration, when the electric heater 2 is energized, the heating space 3
The heating chamber 1 is heated through the heating chamber 1, and the temperature of the bottom surface of the combustion chamber 6 which is connected to the heating chamber 1 also rises. When the temperature of the vaporizing section reaches or exceeds the fuel vaporization temperature using a temperature detector 7 fixed to the bottom of the combustion chamber and a control circuit (not shown), the fuel pump 9 is activated to pump fuel from the fuel tank (not shown) to the fuel nozzle. 8 to the vaporization section at the bottom of the combustion chamber 6. At the same time, the blower 10 is also operated, and air enters the heating space 3 through a small hole 1a formed in the heating chamber 1, becoming high-temperature warm air, and is supplied to the vaporizing section through the small hole 1b. At the same time, the air is 4
The fuel is supplied into the combustion chamber 5 through a small hole 4a provided in the combustion chamber 5.

The fuel injected into the vaporization section vaporizes when it touches a high-temperature surface, but in the configuration of the present invention, the air heated to a high temperature supplied from the lower small hole 1b of the heating chamber 1 scavenges the vaporized gas vaporized in the vaporization section. As the fuel vaporizes in a short time, tar is formed on the vaporizing surface (a substance that is formed on the vaporizing surface when the fuel thermally decomposes and becomes a polymer, which is likely to occur when the fuel is exposed to high temperatures for a long time). ) is produced less.

In order to effectively scavenge air in the vaporization section, it is preferable that the small holes 1b in the lower part of the heating chamber be oriented diagonally downward so that the air directly contacts the vaporization surface.

The vaporized gas vaporized in the vaporization section rises while mixing with the warm air supplied from the small hole 1b and the air supplied from the small hole 4a at the bottom of the flame tube 4. The rising mixed gas flows through the small hole 4 at the top.
Burn while mixing Buddhism with air supplied from a. At this time, combustion flames are formed inward from the small holes 4a and heat the heating chamber 1. When the temperature of the heating chamber rises due to the combustion flame, the amount of electricity supplied to the electric heater is reduced by the temperature detector 7 and the control circuit. The amount of current becomes 0, and vaporization and combustion continue in a stable state due to self-heating.

According to the structure of the present invention, as described above, the combustion flame is formed in the inner circumferential direction, and a heating chamber connected to the vaporization section is provided inside the combustion chamber to heat the combustion chamber, and the vaporization section is heated through the chamber to vaporize the fuel. The necessary amount of heat is supplied by combustion heat during combustion, and power consumption can be significantly reduced.

In addition, as mentioned earlier, supplying warm air to the vaporization section suppresses the generation of tar, making it possible to downsize the vaporization section, significantly shortening the time required to preheat the vaporization section at startup, and reducing power consumption. We were able to reduce this.

Effects of the Invention As is clear from the above description, the combustion device of the present invention has a cylindrical heating chamber containing an electric heater, a flame tube having a large number of small holes on the outer circumference, and an air chamber on the outer circumference. Equipped with
By providing an air passage from the air chamber through the heating chamber to the combustion chamber and supplying high-temperature warm air to the vaporization section, 1) the vaporization chamber is small, making it possible to downsize the combustion device;

2) Preheating time at startup is short.

3) Power consumption is low because fuel is vaporized using combustion heat.

4) Less cool is generated and the life of the device is longer.

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...Heating chamber, 1a, 1b...Small hole,
2. Mountain... electric heater, 4... flame tube, 5...
...vaporization chamber. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
, 10 Sea King/a, lb ---1 to the mouth of the small com Z--1 Denki Hig Figure 1--Danken Village Figure 2

Claims (2)

[Claims] (1) A bottomed cylindrical flame hole tube with many small holes is provided on the outer circumference of a cylindrical heating chamber containing a built-in electric heater, and the gap between the heating chamber and the flame hole tube is arranged approximately concentrically. A liquid fuel combustion device that forms a combustion chamber, has an air chamber on the outer peripheral side of the flame hole cylinder, and has a small hole communicating with the air chamber and a small hole communicating with the combustion chamber in the lower part of the heating chamber. (2) The liquid fuel combustion device according to claim 1, wherein the small hole communicating the heating chamber and the combustion chamber is provided in an obliquely downward direction.