JPH06213415A - Liquid fuel combustion apparatus - Google Patents

Abstract

PURPOSE:To ensure stable combustion in which uneven fuel supply is restricted without breathing, contemplating stabilization of air supply by supplying combustion air into a vaporization cylinder through a straightening element disposed in the vicinity of an outlet of an air passage. CONSTITUTION:There are provided a vaporization chamber 1 having a burner head 4, an air passage 10 for guiding combustion air sent from a fan 9 into the vaporization cylinder 1, and a fuel nozzle 15 disposed on the air passage 10 for injecting a liquid fuel sent from a fuel pump 17 into the vaporization cylinder 1. Further, a straightening element 19 formed in a honeycome shape or a lattice shape is disposed in the vicinity of an outlet of the air passage 10, through the element 19 combustion air is supplied into the vaporization cylinder 1.

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 in an oil combustor such as an FF type oil hot air heater, an oil fan heater, an oil water heater and the like.

[0002]

2. Description of the Related Art A conventional liquid fuel combustion apparatus of this type has, for example, as described in JP-A-3-20509, air inside a bottomed cylindrical vaporization cylinder having a burner head. While sending combustion air from the blower through the passage, liquid fuel from the fuel pump is jetted into the vaporization cylinder by the fuel nozzle arranged in the air passage, and the liquid fuel is vaporized and premixed inside the vaporization cylinder, It is known to burn with a burner head.

[0003]

By the way, the above-mentioned air passage has a bent portion which is bent at a substantially right angle between the vaporization cylinder and the blower because of the concentric arrangement of the fuel nozzles. Therefore, the flow of the combustion air is disturbed at the bent portion, and not only the air cannot be smoothly supplied, but also a part of the discharged fuel adheres to the outer lower surface of the fuel nozzle tip due to the disturbance of the combustion air flow. However, due to that, there was a problem that uneven fuel supply occurred and breath combustion was generated.
As a means to suppress this breath combustion, a coating film is applied to the vaporization surface inside the vaporization cylinder, and a perforated plate is placed inside the vaporization cylinder and burner head, but this does not lead to elimination of breath combustion. Met.

The present invention has been made in view of the above situation, and stabilizes the air supply by supplying combustion air into the vaporization cylinder through a rectifying element arranged near the outlet of the air passage. At the same time, it is intended to suppress uneven fuel supply and enable stable combustion without breathing.

[0005]

According to the present invention, a vaporizer having a burner head, a blower for guiding combustion air sent from a blower to the inside of the vaporizer, and a blower arranged in this air passage and sent from a fuel pump. A fuel nozzle for ejecting liquid fuel into the vaporization cylinder is provided, and a rectifying element formed in the shape of a honeycomb or a lattice is arranged near the outlet of the air passage, and combustion air is provided inside the vaporization cylinder through the rectifying element. Is configured to be supplied.

[0006]

According to this structure, the combustion air sent from the blower passes through the rectifying element formed in the honeycomb shape or the lattice shape even if the flow of the combustion air is disturbed at the bent portion of the air passage. Since the air is rectified by this rectifying element, the combustion air can be sent from around the fuel nozzle into the vaporization cylinder in a stable flow state, and the fuel can be prevented from adhering to the outside of the tip of the fuel nozzle. Therefore, the combustion air and the fuel can be smoothly supplied into the vaporization cylinder, and the combustion state is stabilized.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings of FIGS. In FIG. 1, 1 is a bottomed cylindrical vaporization tube having an open top, 2 is an electric heater such as a sheathed heater embedded in the upper part of the vaporization tube 1, 3 is a diaphragm plate disposed in the upper part of the vaporization tube 1, 4 Is a burner head fitted and attached to the upper end opening of the vaporization cylinder 1 on the diaphragm plate 3. The burner head 4 has a large number of through holes 5 and 5 in its bottom wall and its peripheral wall in its peripheral wall. A large number of flame holes 6 and 6 are provided. Reference numeral 7 is a burner ring made of heat-resistant steel arranged on the outer periphery of the burner head 4, and the horizontal portion of the burner ring 7 is the vaporizing cylinder 1
It is fixed to the upper end surface of.

Reference numeral 8 designates a bottomed cylindrical burner case which is provided on the outer periphery of the vaporization cylinder 1 and accommodates and fixes the vaporization cylinder 1 therein.
Is a blower for sending the primary air for combustion into the vaporization cylinder 1 through the primary air passage 10, and 11 is the vaporization cylinder 1 and the burner case 8.
It is a secondary air passage for supplying the secondary air for combustion from the blower 9 to the space between and. The primary air passage 10
Is an air nozzle part 1 formed integrally with the peripheral wall part of the vaporization cylinder 1.
3, a substantially L-shaped blower pipe 14 connected to the air nozzle portion 13, a connecting pipe (not shown) connecting the blower pipe 14 and the blower 9, and the like.

Reference numeral 15 is the air nozzle portion 13 and the blower pipe 14.
Is disposed in the primary air passage 10 between the
Is a fuel nozzle provided concentrically with the inside of the fuel nozzle. The fuel nozzle 15 has a base end fixed to the blower pipe 14, and a fuel supply passage 16 and a fuel pump 17 such as an electromagnetic pump. Communicates with the fuel tank 18, while
The tip discharge port 15A of the fuel nozzle 15 faces the inside of the vaporization cylinder 1 from the outlet 13A of the air nozzle unit 13. Then, the liquid fuel in the fuel tank 18 pumped up by the driving of the fuel pump 17 passes through the fuel supply passage 16 and the fuel nozzle 15, and is ejected from the tip discharge port 15A of the fuel nozzle 15 into the vaporization cylinder 1. .

Reference numeral 19 denotes a rectifying element arranged in the primary air passage 10. The rectifying element 19 is formed in a honeycomb shape and has a length dimension of about 10 to 20 mm in the primary air flow direction. As shown in FIGS. 1 and 2, the rectifying element 19 is inserted into the horizontal end 14A of the blower pipe 14 near the outlet of the primary air passage 10, and the vaporizing cylinder 1 is passed through the rectifying element 19. Primary air for combustion is supplied to the inside.

In the above-mentioned structure, when the vaporization cylinder 1 rises above the vaporizable temperature of the liquid fuel by energizing the electric heater 2, the blower 9 and the fuel pump 17 are operated, the liquid fuel is ejected from the fuel nozzle 17, and The combustion primary air that has passed through the rectifying element 19 is supplied into the vaporization cylinder 1 from the outlet 13A of the air nozzle portion 13. Here, the fuel supplied into the vaporization cylinder 1 is vaporized by contacting the vaporization surface, and the mixture of the vaporized gas and the primary air for combustion passes through the passage of the diaphragm plate 3 and the through holes 5, 5. It passes through and enters the burner head 4, and ejects from each flame hole 6, 6. The jetted air-fuel mixture is ignited by spark discharge generated from an ignition plug (not shown) and starts combustion.

On the other hand, the secondary air for combustion supplied into the burner case 8 through the secondary air passage 11 rises in the annular space between the peripheral wall of the burner case 8 and the vaporization cylinder 1 to burner ring. It flows near the outer periphery of 7 and is supplied to the flame to promote secondary combustion.

After that, the heat of the flame is recovered in the vaporizing cylinder 1,
When the temperature of the vaporization portion of the vaporization cylinder 1 is maintained at the vaporizable temperature of the fuel due to the recovered heat, the electric heater 2
However, the combustion is continued.

According to this embodiment, in the horizontal side end portion 14A of the blower pipe 14 connected to the air nozzle portion 13 of the vaporization tube 1,
Since the rectifying element 19 formed in the honeycomb shape is inserted and the primary air for combustion is supplied into the vaporization cylinder 1 through the rectifying element 19, the primary air for combustion sent from the blower 9 is substantially L-shaped. Even if turbulence occurs in the flow at the bent portion of the blower pipe 14 bent in the direction of, the air is rectified when passing through the rectifying element 19 and flows into the air nozzle portion 13, and the fuel nozzle 15
Can be fed into the vaporization cylinder 1 from around the same in a substantially uniform and stable flow state.

Therefore, it is possible to suppress a part of the discharged fuel from adhering to the outside of the tip of the fuel nozzle 15, prevent uneven fuel supply, and smoothly supply the primary air for combustion and the fuel into the vaporization cylinder 1. As a result, the vaporization of the fuel is stabilized, and the premixing of the vaporized gas and the primary air for combustion is also stabilized, so that a good combustion state without breathing combustion can be obtained.

Although the rectifying element 19 formed in a honeycomb shape is used in the above-described embodiment, as shown in FIG. 3, the rectifying element 19 formed in a lattice shape is used as the blower pipe 14.
Even if it is inserted into the horizontal side end portion 14A, the same effect as that of the embodiment can be obtained.

[0017]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the combustion air sent from the blower can be rectified and sent into the vaporization cylinder from the periphery of the fuel nozzle in a stable flow state, The smooth supply of air and fuel is possible, with a simple structure, almost no breathing occurs,
A stable combustion state can be realized.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vaporizing cylinder (vaporizer) 4 Burner head 9 Blower 10 Primary air passage (air passage) 15 Fuel nozzle 17 Fuel pump 19 Rectifying element

Claims (1)

[Claims] 1. A vaporization cylinder having a burner head, an air passage for guiding combustion air sent from a blower to the inside of the vaporization cylinder, and liquid fuel sent from a fuel pump disposed in the air passage to the inside of the vaporization cylinder. With a fuel nozzle to eject,
A liquid fuel combustion apparatus characterized in that a rectifying element formed in a honeycomb shape or a lattice shape is arranged near the outlet of the air passage, and combustion air is supplied into the vaporization cylinder through the rectifying element. .