JPH05106809A - Vaporizing type petroleum fuel combustion apparatus - Google Patents

Abstract

PURPOSE:To remarkably improve the heat-insulating property of a metallic vaporizing column and reduce the power consumption by covering the inner and outer surfaces of the vaporizing column with a low-heat-conductive materials having a lower heat-conductivity than the vaporizing column. CONSTITUTION:The inner and outer surfaces of a metallic vaporing column 3 which is heated by an electric heater 3 are covered with low-heat-conductive materials 16A and 16B having lower heat-conductivities than the vaporizing column 3. Therefore, heat dissipation from the inner and outer surface of the vaporizing column 3 is restrained and the heat-insulating property of the vaporing column 3 is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporization type petroleum combustion apparatus which vaporizes petroleum fuel such as kerosene in a vaporization cylinder, mixes it with combustion air, and supplies the mixture to a combustion section for combustion.

[0002]

2. Description of the Related Art Conventionally, this type of vaporization type petroleum combustion apparatus is
For example, as disclosed in Japanese Examined Patent Publication No. 63-45003, a vaporization cylinder made of a metal such as an aluminum alloy having good thermal conductivity is provided, and the vaporization cylinder is heated to about 200 to 250 ° C. by using an electric heater. By heating to 1, the petroleum fuel such as kerosene is vaporized in the vaporization cylinder and the combustion air is mixed, and the mixture is supplied to the combustion section for combustion.

By the way, in the vaporization cylinder described above, it is necessary to maintain the temperature of the vaporization surface within a proper range of about 200 to 250 ° C. In order to maintain the temperature within the proper range, energization to the electric heater is controlled. However, while combustion air is sent inside the vaporization cylinder, secondary air is introduced to the outer peripheral portion of the vaporization cylinder, so a large amount of heat is dissipated from both the inside and outside surfaces of the vaporization cylinder,
There are drawbacks such as an increase in preheating time at ignition, a need for an electric heater with a large capacity to shorten the preheating time, and a long energization time to the electric heater at combustion, which increases power consumption. Was there.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and the inner and outer surfaces of a metal vaporization cylinder are coated with a low thermal conductivity material having a lower thermal conductivity. The purpose of this is to significantly improve the heat retention of the vaporization tube and reduce the power consumption.

[0005]

The present invention comprises a metal vaporization tube heated by an electric heater, and the inner and outer surfaces of the vaporization tube are coated with a low heat conductive material having a lower thermal conductivity than that of the vaporization tube. It is a configuration.

Further, according to the present invention, a metal vaporization cylinder heated by an electric heater is provided, and the inner and outer surfaces of the vaporization cylinder are coated with a low heat conductive material having a lower thermal conductivity than the vaporization cylinder, and The thickness of the low thermal conductive material on the surface side is smaller than that on the outer surface side.

[0007]

With this structure, heat radiation on the inner and outer surfaces of the vaporizing cylinder is suppressed, and the heat retaining property of the vaporizing cylinder is significantly improved. Therefore, the preheating time is shortened at the time of ignition, an electric heater with a large capacity is not required to shorten the preheating time, and the energization time to the electric heater can be shortened to reduce the power consumption.

Further, in the vaporization type petroleum combustion device of the second aspect, while sufficiently suppressing the heat radiation from the outer surface of the vaporization cylinder,
It is possible to prevent the temperature of the vaporization surface portion from falling below an appropriate range, and it is possible to maintain a good vaporization state while improving the heat retention of the vaporization cylinder.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 2, reference numeral 1 is a burner case into which combustion secondary air from a burner blower (not shown) is sent through a secondary air supply pipe 2, and 3 is a bottomed cylindrical vaporization cylinder housed in the burner case 1. An electric heater 4 such as a sheathed heater is embedded in the upper part of the peripheral wall 3A of the vaporization cylinder 3, and the vaporization cylinder 3 is made of a metal material having good thermal conductivity such as aluminum die cast. ing. A throttle plate 6 having a throttle opening 5 in the center is provided in the upper part in the vaporization cylinder 3, and a large number of flame holes 7, 7 are formed in the peripheral wall at the upper end opening of the vaporization cylinder 3 on the diaphragm plate 6. At the same time, a burner head 9 having a large number of through holes 8 and 8 as a combustion portion is attached to the bottom wall. Reference numeral 10 is a flame retaining ring that also serves as a ground plate, 11 is an ignition plug, and 12 is a frame rod for detecting the flame F formed in the flame hole portion 8.

On the side of the vaporizing cylinder 3, a fuel nozzle 13 for jetting petroleum fuel such as kerosene into the vaporizing cylinder 3 and an air nozzle portion 14 for supplying combustion primary air into the vaporizing cylinder 3 are coaxial. The air nozzle portion 14 is connected to a burner blower (not shown) via an air supply pipe 15.
On the other hand, the fuel nozzle 13 is connected to a fuel tank (not shown) via an oil feed pipe and a fuel pump (both not shown).

Further, the vaporization tube 3 has a low thermal conductivity such as stainless (18Cr-8Ni) foil whose inner and outer surfaces of the peripheral wall 3A and the bottom wall 3B are lower in thermal conductivity than the material of the vaporization tube 3 itself. It is covered with a conductive material 16A, 16B. The thickness of the low thermal conductive material 16A on the inner surface side is about 8 μm, and the thickness of the low thermal conductive material 16B on the outer surface side is 25 μm or more. When the low heat conductive materials 16A and 16B are stainless (18Cr-8Ni) foils, they are molded into a product having a similar shape to the inner surface of the vaporization tube 3 and a product having a similar shape to the outer surface, and fitted inside and outside the vaporization tube 3. They may be joined together, or they may be integrally molded at the time of die casting.

In the above-mentioned structure, the vaporization cylinder 4 is heated to a predetermined temperature by energizing the electric heater 4, and when a temperature detector (not shown) arranged on the peripheral wall 3A of the vaporization cylinder 4 detects it, the burner blower is sent. And a fuel pump (both not shown) are activated, and petroleum fuel is discharged from the fuel nozzle 13 and the air pipe 1
Combustion primary air is supplied from 5 through the air nozzle portion 14 into the vaporization cylinder 3, while combustion secondary air is sent into the burner case 1 from the secondary air supply pipe 2. The petroleum fuel supplied into the vaporization cylinder 3 contacts the vaporization surface and vaporizes, and this vaporized gas mixes with the combustion primary air, and this mixed gas passes through the throttle port 5 of the throttle plate 6 and enters the burner head 9. It enters and ejects from the flame hole 7. This spouted mixed gas is the spark plug 1
It is ignited by the spark discharge of No. 1, forms flame F, and starts combustion. Combustion is started in this way, and as shown in FIG. 3, when the temperature of the vaporizing cylinder 3 rises to about 250 ° C., the power supply to the electric heater 4 is stopped, and when the temperature of the vaporizing cylinder 3 drops to about 200 ° C., the electric heater 4 is restarted. Is energized to control the temperature of the vaporizing cylinder 3 within an appropriate range of about 200 to 250 ° C.

According to the above-described embodiment, the entire inner and outer surfaces of the vaporization cylinder 3 made of aluminum die cast are made of a low thermal conductivity material such as stainless (18Cr-8Ni) foil having a lower thermal conductivity than the vaporization cylinder 3. Since it is covered with 16A and 16B,
Heat dissipation from the inner and outer surfaces of the vaporization cylinder 3 is reduced by the low heat conductive material 16
It can be suppressed by A and 16B, and the heat retaining property of the vaporizing cylinder 3 is significantly improved as compared with the conventional case. Therefore, as shown in FIG. 3, at the time of ignition, the preheating time is shortened, and even if the electricity to the electric heater 4 is stopped, the temperature gradient of the vaporizing cylinder 3 that descends becomes gentle and the electric heater 4 The number of times of turning on and off is reduced, and the total energization time to the electric heater 4 can be shortened.

Further, the thickness of the low heat conductive material 16A on the inner surface side of the vaporization tube 3 is set to about 8 μm, and the thickness of the low heat conductive material 16B on the outer surface side is set to 25 μm or more, so that the low heat conductive material on the inner surface side is low. Since the thickness of the conductive material 16A is thinner than the thickness of the low heat conductive material 16B on the outer surface side, the low heat conduction on the inner surface side which becomes the vaporization surface portion is sufficiently suppressed while suppressing the heat radiation from the outer surface of the vaporization tube 3. It is possible to prevent the temperature of the surface of the permeable material 16A from falling below an appropriate range, and it is possible to maintain a good vaporization state while enhancing the heat retention of the vaporization cylinder 3.

Further, in the above-mentioned embodiment, the low heat conductive materials 16A and 16B are made of stainless steel (18Cr-8N).
Since it is set to i), the surface of the vaporization cylinder 3 made by aluminum die casting can be protected and heat resistance and durability can be improved.

The low thermal conductive materials 16A and 16B for coating the inner and outer surfaces of the vaporizing cylinder 3 may be ceramics or heat-resistant paint containing ceramics as a main component.

[0017]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, heat radiation on the inner and outer surfaces of the vaporizing tube can be suppressed, the heat retention of the vaporizing tube can be greatly improved, and the preheating time at ignition can be improved. It is shortened and the usability is improved. Moreover, not only does an electric heater with a large capacity not be required to shorten the preheating time, but also the time for energizing the electric heater can be shortened, and the power consumption can be significantly reduced.

In the vaporization type petroleum combustion apparatus according to the second aspect, it is possible to sufficiently suppress the heat radiation from the outer surface of the vaporization cylinder and prevent the temperature of the vaporization surface part from falling below the appropriate range, and to keep the vaporization cylinder warm. It is possible to maintain a good vaporization state while increasing the.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a vaporization type petroleum combustion apparatus showing an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a vaporization type petroleum combustion device.

FIG. 3 is a characteristic diagram showing a relationship between temperature and time of a vaporization cylinder in a conventional device and a device of the present invention.

[Explanation of symbols]

 3 Vaporization cylinder 4 Electric heater 16A Low thermal conductivity material 16B Low thermal conductivity material

Claims (2)

[Claims] 1. A vaporization formula characterized by comprising a metal vaporization cylinder heated by an electric heater, wherein the inner and outer surfaces of the vaporization cylinder are covered with a low heat conductive material having a lower thermal conductivity than that of the vaporization cylinder. Oil burning equipment. 2. A metal vaporization tube heated by an electric heater is provided, the inner and outer surfaces of the vaporization tube are covered with a low heat conductive material having a lower thermal conductivity than that of the vaporization tube, and a low heat on the inner surface side is provided. A vaporization type petroleum combustion device characterized in that the thickness of the conductive material is thinner than the outer surface side.