JP2762752B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion device used for an oil fan heater or the like.

[0002]

2. Description of the Related Art In general, a liquid fuel combustion device in an indoor combustion device such as an oil fan heater is configured as shown in FIG. That is, in FIG. 5, reference numeral 31 denotes a bottomed cylindrical vaporizing cylinder for vaporizing liquid fuel, in which a sheath heater 32 is embedded. Reference numeral 33 denotes a bottomed cylindrical burner head in which a flange on the peripheral edge of the lower mixed gas inlet 33a is placed on the opening edge of the vaporizing cylinder 31 and screwed.
A large number of flame holes 34 for burning a mixed gas of the fuel and the combustion air vaporized in the above are provided substantially uniformly on the peripheral wall portion, and a wire mesh 35 is mounted inside and outside the peripheral wall. Reference numeral 36 denotes a lid covering the upper opening of the burner head 33, and 37 denotes an earth plate having an annular wall 38 located on the outer periphery of the flame hole of the burner head 33. The ground plate extends from the burner head 33 to the annular wall 38. A number of small holes 39 are provided in the portion. Numeral 40 denotes a blower pipe for sending combustion air into the vaporizing cylinder 31. An air port 41 at the tip is fixed to the wall surface of the vaporizing cylinder 31, and the other communicates with the blower. Reference numeral 42 denotes a nozzle communicating with an oil supply pipe 43 from a fuel pump.

The operation of the liquid fuel combustion apparatus configured as described above will be described below. First, when the vaporizing cylinder 31 is heated to a predetermined temperature by the sheath heater 32, combustion air is sent from the air port 41 into the vaporizing cylinder 31, and fuel is ejected from the nozzle 42 to the vaporizing cylinder 31. The liquid fuel injected into the vaporizing cylinder 31 is vaporized on the wall surface of the heated vaporizing cylinder 31, mixed with combustion air, guided into the burner head 33, ignited by spark discharge from an ignition electrode or the like, and ignited by a flame. 44 is formed in the flame hole 34. Since the ground plate 37 having the annular wall 38 is provided on the outer periphery of the flame hole 34, the combustion tube 45 forming the combustion chamber is not heated to a high temperature by the flame 44 formed in the flame hole 34. . And the burner head 3 of the earth plate 37
A portion of the hot air or the combustion air is taken into the flame 44 from a large number of small holes 39 provided in the horizontal portion from 3 to the annular wall 38, so that the combustion range is widened.

[0004]

However, in the above-mentioned conventional construction, when the combustion is carried out with a strong combustion amount, the flame 44 spreads and climbs over the annular wall 38 of the earth plate 37, so that the combustion cylinder 45 is easily heated to a high temperature and the burner is burned. The efficiency of heat recovery from the head 33 to the vaporizing cylinder 31 is low, and in order to vaporize kerosene at an appropriate temperature, it is necessary to energize the sheath heater 32 to increase the temperature of the vaporizing cylinder 31. If a portion of the warm air supplied from the combustion tube 45 is not supplied to the flame 44 due to dust clogging of the small holes 39, the vaporization tube 31
However, there is a problem that the operation of the safety device that stops abnormal combustion by detecting abnormal heating of the vaporizing cylinder 31 becomes slow.

[0005] The present invention has been made in view of the above point, while preventing the temperature rise of the combustion cylinder, increasing the heat recovery efficiency to the vaporization cylinder, maintaining the vaporization cylinder at the optimal vaporization temperature of kerosene, The purpose is to make it easier for the safety device to work in the event of an abnormality such as dust clogging.

[0006]

In order to solve the above-mentioned problems, the present invention has a structure in which an inward flange is provided on an annular wall of a ground plate.

[0007]

According to the present invention, it is possible to prevent the spread of the flame at the time of strong combustion by the above-mentioned structure, thereby preventing the temperature rise of the combustion cylinder, and increasing the heat recovery efficiency from the burner head to the vaporization cylinder. The temperature of the vaporizing cylinder can be maintained at the optimal vaporizing temperature of kerosene, and the safety device can be easily operated in the event of an abnormality such as dust clogging.

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1 to FIG. 3, reference numeral 1 denotes a bottomed cylindrical vaporizing cylinder having an open top and an inner peripheral surface having an arc-shaped surface with no protrusion, in which a sheath heater 2 is embedded. 3 is the above-mentioned vaporization cylinder 1
A flame that burns a mixed gas of the fuel and the combustion air vaporized in the vaporizing cylinder 1 by a cylindrical burner head having a flange on the peripheral edge of the lower mixed gas inlet 3a mounted on the opening edge of the cylinder. A large number of holes 4 are provided substantially evenly on the peripheral wall, and a wire mesh 5 is mounted inside and outside the peripheral wall. Reference numeral 6 denotes a lid covering the upper opening of the burner head 3, 8 an ignition electrode for igniting the mixed gas ejected from the flame hole 4, 9 a frame rod as a flame detection sensor, and 10 a flame. 11
Is a ground plate having an annular wall 12 located at an interval on the outer periphery of the burner head 3, and a large number of small holes 1 are formed in a horizontal portion 13 from the burner head 3 to the annular wall 12.
4 is provided, and an inward flange 12 a is provided on the inner peripheral portion of the annular wall 12. Reference numeral 15 denotes a blower pipe for sending combustion air into the vaporizing cylinder 1, and an air port 16 at the tip is fixed to a wall surface of the vaporizing cylinder 1, and the other is in communication with a blower 17. Reference numeral 18 denotes a nozzle connected to an oil supply pipe 20 from a fuel pump 19, and the nozzle 18 faces the inside of the vaporization cylinder 1 through the inside of the air supply pipe 15. Reference numeral 21 denotes a combustion tube which surrounds the burner head 3 to form a combustion chamber. Reference numeral 22 denotes a blower for warm air.
Are supplied to the periphery of the burner head 3 through the small holes 14.

In the above configuration, when the sheath heater 2 is energized and the vaporizing cylinder 1 is heated to a predetermined temperature, the blower 1
7 starts and the combustion air passes through the blower 17 and the air port 1
6 to the inside of the vaporizing cylinder 1, the fuel pump 19 is also started, and the fuel passes through the oil supply pipe 20 from the nozzle 18 to the vaporizing cylinder 1.
Squirted inside. The fuel injected into the vaporizing cylinder 1 is vaporized on the side wall surface of the heated vaporizing cylinder 1, mixed with the combustion air, sent to the burner head 3, and ejected from the flame hole 4. Then, the mixed gas is ignited by spark discharge from the ignition electrode 8 to form a flame 10.

As shown in FIG. 1, a flame 10 formed in the flame hole 4 has an inward flange 1 on an inner periphery of an annular wall 12.
By providing 2a, the spread of the flame at the time of strong combustion is prevented, and the temperature of the combustion cylinder 21 is prevented from rising.
The temperature in the vicinity of the burner head 3 increases, the efficiency of heat recovery from the burner head 3 to the vaporizing cylinder 1 is improved, and the temperature of the vaporizing cylinder 1 can be maintained at the optimal vaporizing temperature of kerosene. Further, when a part of the hot air supplied from the small hole 14 of the ground plate 11 is not supplied to the flame 10 due to dust clogging or the like, the flame is formed inward by the flange 12a. Therefore, the temperature rise of the vaporizing cylinder 1 is remarkably promoted. Therefore, a large amount of CO can be prevented from flowing into the room by the operation of the safety device that stops the combustion by detecting abnormal overheating of the vaporizing cylinder 1.

FIG. 4 shows a second embodiment of the present invention.
The difference from this embodiment is that the flange 12a is integrally formed by inclining the annular wall 12 of the ground plate 11 inward.

In the liquid fuel combustion apparatus having the above-described structure, the spread of the flame during the strong combustion is prevented, and the temperature of the combustion cylinder 20 is prevented from rising. And the temperature of the vaporizing cylinder 1 is maintained at the optimal vaporizing temperature of kerosene, and a portion of the warm air supplied from the hole 21a of the combustion cylinder 21 enters the flame 10 due to dust clogging or the like. When the supply is stopped, the temperature rise of the vaporizing cylinder 1 is promoted, and the safety device is activated by abnormal overheating of the vaporizing cylinder 1 to prevent the large outflow of CO into the room. Exactly the same as the example, but since the upper part of the annular wall is inclined inward, the structural strength is strong and can withstand long-time use at high temperature.

[0013]

As apparent from the above description of the embodiment, according to the present invention, it is possible to prevent the spread of the flame during the strong combustion, prevent the temperature of the combustion cylinder from rising, and reduce the temperature near the burner head. As the heat recovery efficiency from the burner head to the vaporizing cylinder increases, the temperature of the vaporizing cylinder can be maintained at the optimal vaporizing temperature of kerosene, so there is no need to energize the sheathed heater during combustion, reducing power consumption. Yes. In addition, when part of the hot air supplied from the combustion cylinder is not supplied to the flame due to dust clogging or the like, the temperature of the vaporization cylinder is promoted, and abnormal overheating of the vaporization cylinder is detected to perform combustion. The operation of the safety device for stopping the operation can prevent a large amount of CO from being emitted into the room.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the liquid fuel combustion device.

FIG. 3 is a cross-sectional view showing the entire liquid fuel combustion device.

FIG. 4 is a sectional view of a liquid fuel combustion apparatus according to another embodiment of the present invention.

FIG. 5 is a sectional view of a conventional liquid fuel combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vaporization cylinder 2 Heater 3 Burner head 11 Ground plate 12 Annular wall 12a Flange 14 Small hole

Claims (2)

(57) [Claims] 1. A burner head having a flame hole is provided substantially uniformly around the entire peripheral wall so as to cover an opening of a cylindrical vaporizing cylinder having a built-in heater, and an annular ring is provided on the outer periphery of the burner head at intervals. A liquid fuel combustion apparatus having a ground plate having a wall, a large number of small holes provided in a portion of the ground plate from the burner head to the annular wall, and an inward flange provided in the annular wall. . 2. The liquid fuel combustion apparatus according to claim 1, wherein the flange is integrally formed by inclining an upper portion of the annular wall inward.