JP3143285B2 - 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 apparatus for vaporizing and burning a liquid fuel such as kerosene, and more particularly to a liquid fuel combustion apparatus having a heat recovery ring attached to an upper part of a vaporization cylinder.

[0002]

2. Description of the Related Art In a conventional liquid fuel combustion apparatus of this type, for example, as disclosed in Japanese Patent Application Laid-Open No. 4-76302, this opening is provided at the opening of a vaporizing cylinder having a heater embedded in the peripheral wall. Attach a burner plate with a flame hole so as to cover it, attach a heat recovery ring to the upper part of the vaporization cylinder, and stop the power supply to the heater by heating this heat recovery ring with the flame formed on the burner plate What is known is that the vaporization cylinder can be maintained at the vaporization temperature of the liquid fuel.

[0003]

By the way, in the above-mentioned conventional liquid fuel combustion apparatus, the burner plate has a plurality of burner plates of a metal plate provided with burner holes, and a burner plate interposed between the plurality of burner plates. Due to the structure composed of the wire mesh, the jetting speed of the mixed gas decreases during weak combustion, the flame adheres to the surface of the flame plate, the flame plate is excessively heated and glows red, causing There was a concern that the burner plate would be damaged by heat. Therefore, if a ceramic burner plate is fitted to the opening of the vaporizing cylinder and the mixed gas is burned by this ceramic burner plate, the burner can be burned even if the flame adheres to the surface of the burner plate. There is no need to worry about heat damage to the plate, and low-calorie weak burning is possible, and the burning width can be expanded. However, the ceramic burner plate has a problem that cracks occur when a large external force is locally applied due to a fixture for fixing the burner plate or when an external force is applied due to an impact such as a drop.

The present invention has been made in view of the above-mentioned circumstances, and aims at simplifying the operation of attaching a burner plate while improving the heat recovery to a vaporizing cylinder. It is an object of the present invention to prevent the occurrence of cracks in a ceramic burner plate by preventing external force from being applied more than necessary.

[0005]

According to the present invention, an opening is provided at an upper central portion , and a liquid fuel is vaporized therein and mixed with combustion air.
A cylindrical vaporizing cylinder having a space to be closed, and fitted and mounted on the stepped end of the vaporizing cylinder so as to cover the opening of the vaporizing cylinder, and eject a mixed gas of vaporized fuel and air. a circular plate-shaped ceramic burner plate for burning Te mounting portion is screwed to the top of the vaporizing tube and
A heat recovery ring having a cylindrical heat recovery portion raised from the mounting portion , wherein the burner plate includes a vaporization cylinder.
A number of flame holes drilled in the axial direction of the burner plate
Of the heat recovery ring .
The receiving part has an inner surface formed on the burner plate on the outer peripheral side.
The inner diameter of the heat recovery part is located above the flame hole of
If it is formed smaller than the external dimensions of the burner plate
In addition, the mounting portion of the heat recovery ring has a burner nap inside.
The center of the vaporizing cylinder, facing the upper surface of the outer periphery of the rate
, And a plate spring is provided on the extension portion for pressing against the upper surface of the outer peripheral portion of the burner plate to press and hold the burner plate on the vaporizing cylinder.

[0006]

When the burner plate is fitted into the opening of the vaporizing cylinder and the heat recovery ring is attached to the vaporizing cylinder, a plurality of leaf springs provided on the heat recovery ring press against the outer peripheral upper surface of the burner plate. Therefore, the burner plate can be securely held on the vaporizing cylinder by using the heat recovery ring attached to the upper part of the vaporizing cylinder, which not only improves the heat recovery to the vaporizing cylinder but also simplifies the work of attaching the burner plate. Can be achieved. Further, the burner plate is pressed and held by the vaporizing cylinder by a plurality of leaf springs provided on the heat recovery ring, so that rattling is prevented, and the external force applied to the burner plate is reduced by the leaf spring. Does not apply an external force more than necessary, and it is possible to reliably prevent cracks from being generated in the ceramic burner plate.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a bottomed cylindrical vaporizing cylinder having an open top, and the vaporizing cylinder 1 is made of aluminum die-cast. 2 is a sheath heater buried in the upper part of the peripheral wall of the vaporizing cylinder 1, 3 is a primary air passage for supplying primary air for combustion into the vaporizing cylinder 1, and this primary air passage 3 communicates with a blower 4. Reference numeral 5 denotes a burner case provided on the outer periphery of the vaporizing cylinder 1 and accommodating the vaporizing cylinder 1. The vaporizing cylinder 1 is mounted and fixed on the upper surface of the bottom wall of the burner case 5.

Reference numerals 6 and 6 denote secondary air holes provided in the lower part of the peripheral wall of the burner case 5, and these secondary air holes 6 and 6 are provided.
The secondary air is supplied into the burner case 5 by natural ventilation. Reference numeral 7 denotes a fuel nozzle for supplying the liquid fuel (kerosene) from the oil tank 9 into the interior of the vaporizing cylinder 1 by using a fuel pump 8; and 10, a diaphragm plate disposed at an upper portion in the vaporizing cylinder 1. Below the throttle passage 11 formed at the center of the disk 10, a disk-shaped baffle plate 12 is provided.
And the diaphragm plate 10 is provided integrally with the vaporizing cylinder 1.
It is mounted on a first step 13 formed therein.

Reference numeral 14 denotes a ceramic burner plate fitted in the opening of the vaporizing cylinder 1. The burner plate 14 is resistant to heat shock and has high density and low expansion such as petalite or the like which is excellent in heat shock resistance. It is made of ceramics and has a circular flat plate shape. The burner plate 14 is placed on a second step 15 formed on the first step 13, and the outer periphery of the lower surface thereof is in contact with the upper surface of the outer periphery of the diaphragm plate 10. . Reference numerals 16 and 16 denote a large number of flame holes provided on the outer peripheral portion of the burner plate 14. These flame holes 16 are arranged in a plurality of rows in the circumferential direction, and the hole diameter is set to about 1 to 2 mm.

Reference numeral 17 denotes a heat recovery ring made of a heat-resistant steel plate mounted and fixed on the upper end surface of the vaporization cylinder 1. The heat recovery ring 17 also serves as an earth plate. It comprises a ring-shaped mounting portion 17A which comes into contact with the upper end surface and is screwed to it, and a cylindrical heat recovery portion 17B rising from the inner edge of the mounting portion 17A. The mounting portion 17A extends toward the center of the vaporizing cylinder 1 so that the inner edge thereof is opposed to the outer peripheral portion of the burner plate 14. 14 by pressing against the upper surface of the outer peripheral part,
A plurality of (four in the embodiment) leaf springs 19 for pressing the burner plate 14 against the second step portion 15 are fixed at substantially equal intervals by spot welding. The heat recovery portion 17B has an inner diameter smaller than an outer diameter of the burner plate 14 such that an inner surface of the heat recovery portion 17B is located immediately above the flame hole 16 provided on the outermost side of the burner plate 14. It is.

Further, reference numeral 20 in FIG.
An ignition rod 21 for igniting the mixed gas ejected from the flame hole 16 of the frame rod 21 detects the presence or absence of the flame F and detects the oxygen concentration. The tip detection unit 21A of the frame rod 21 It is located at a position close to one of the leaf springs 19.

In the above configuration, when liquid fuel (kerosene) is ejected from the fuel nozzle 7 into the vaporizing cylinder 1, the liquid fuel passes through the ejection pressure of the fuel pump 8 and the primary air passage 3, and is injected into the vaporizing cylinder 1. It is atomized and scattered by the air flow blown out from the blower 4 to be blown, and hits the inner wall of the vaporization cylinder 1 which has been heated in advance by the sheath heater 2 and is vaporized. Then, the vaporized gas is mixed with air in the vaporizing cylinder 1, and the mixed gas flows through the throttle passage 11 of the throttle plate 10 to the burner plate 14, and upwards from the flame holes 16, 16 of the burner plate 14. It is ignited by the spark of the ignition rod 20 and forms a blue flame F to perform gasification combustion.

At this time, the flame F heats the heat recovery part 17B of the heat recovery ring 17, and the heat of the heat recovery part 17B heated to a high temperature by the flame F is transmitted through the mounting part 17A.
Thereafter, even if the energization of the sheath heater 2 is stopped, the vaporizing cylinder 1 is maintained at the temperature at which the liquid fuel can be vaporized, and the gasification combustion is continuously performed.

According to this embodiment, the diaphragm plate 10 is connected to the vaporizing cylinder 1.
After being placed on the first step 13 in the burner plate 1
4 is fitted into the opening of the vaporizing cylinder 1 and placed on the second step portion 15, and a heat recovery ring 17 is attached to the upper end of the vaporizing cylinder 1 using a screw 18, whereby this heat Since the plurality of leaf springs 19, 19 fixed to the recovery ring 17 are in pressure contact with the upper surface of the outer peripheral portion of the burner plate 14, and press the burner plate 14 against the second step portion 15 of the vaporizing cylinder 1, Not only can the heat recovery ring 17 perform good heat recovery to the vaporizing cylinder 1, but also the burner plate 14 can be securely held on the vaporizing cylinder 1 by using the heat recovery ring 17, and the burner plate 14 and the throttle plate 10 Mounting work can be simplified. Further, according to this configuration, the heat recovery
The collecting ring 17 is fixed with a screw 18 from the top of the vaporizing cylinder 1.
Also attaches burner plate 14 and aperture plate 10
The burner plate is broken
When the maintenance of the vaporization cylinder 1 becomes necessary,
If the screw 18 is removed, the damaged part can be replaced or repaired.
It is something that can be done.

Further, since the burner plate 14 is pressed and held on the second step 15 by the plurality of leaf springs 19, 19 fixed to the lower surface of the mounting portion 17A of the heat recovery ring 17, rattling is prevented. And heat recovery ring 1
The external force applied from 7 to the burner plate 14 is reduced by the leaf spring 19, so that no unnecessary external force is applied to the burner plate 14, and the ceramic burner plate 1 is removed.
4 can reliably be prevented from being cracked.

In the above embodiment, the heat recovery ring 1
Reference numeral 7 denotes a ring-shaped mounting portion 17A which comes into contact with the upper end surface of the vaporizing cylinder 1 and is screwed thereto, and a cylindrical heat recovery portion 17B rising from the inner edge of the mounting portion 17A. Therefore, the outer peripheral edge of the burner plate 14, that is,
Even if the mixed gas leaks from the abutting portion between the burner plate 14 and the vaporizing cylinder 1, the mixed gas is discharged to the heat recovery unit 17B.
Flow, and merges with the mixed gas ejected from the flame hole 16 and burns. Therefore, there is no fear that the mixed gas leaks without being burned and generates an odor.

Further, the tip detecting section 2 of the frame rod 21
Since 1A is located at a position close to one of the plurality of leaf springs 19, a stable flame current can be obtained, the detection accuracy of the flame F can be increased, and the safety is improved.

[0018]

According to the present invention, as apparent from the above description, by vaporizing the liquid fuel therein having an opening at the top center retardant
A cylindrical vaporizing cylinder having a bottom and a space for mixing with the air for burning, and a tip opening of the vaporizing cylinder so as to cover an opening of the vaporizing cylinder.
Of with is fitted and attached to the step portion, and a circular plate-shaped ceramic burner plate to burn by jetting a mixed gas of the vaporized fuel and air, a set screw at the top of the vaporizing tube
Cylindrical heat erected from the mounting portion and the attachment portion are
And a heat recovery ring having a collecting portion, the Banapure
The port has a number of flame holes drilled in the axial direction of the vaporizing cylinder.
The heat recovery portion of the heat recovery ring has an inner surface formed along the outer peripheral portion of the burner plate.
The heat recovery so that it is located above the formed flame hole on the outer peripheral side
The inner diameter of the part is smaller than the outer dimensions of the burner plate
And the mounting portion of the heat recovery ring is
So that the edge faces the upper surface of the outer peripheral part of the burner plate,
It extends toward the center of the vaporizing cylinder, and
Is provided with a leaf spring that presses against the upper surface of the outer peripheral portion of the burner plate and presses and holds the burner plate against the vaporizing cylinder. not, a plate spring is pressed against the burner plate, because the burner plate is securely held to the vaporization tube, thereby simplifying the mounting operation of the burner plate. Further, since the burner plate is pressed and held by the vaporizing cylinder by the leaf spring, it is possible to prevent rattling,
The external force applied to the burner plate is reduced by a leaf spring, so that an unnecessary external force is not applied to the burner plate, thereby preventing the ceramic burner plate from cracking. In addition, screw the heat recovery ring from the top of the vaporizing cylinder.
To hold the burner plate in the vaporizing cylinder
In this configuration, the burner plate may break or
If maintenance of the cylinder is required, remove the screws
Makes it easy to replace or repair damaged parts
You.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the overall configuration of the liquid fuel combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vaporization cylinder 14 Burner plate 17 Heat recovery ring 19 Leaf spring

Continuation of front page (56) References JP-A-4-76302 (JP, A) JP-A-5-26413 (JP, A) JP-A-58-26911 (JP, A) JP-A-4-320709 (JP) , A) Japanese Utility Model Showa 57-46215 (JP, U) Japanese Utility Model Showa 54-105941 (JP, U) Japanese Utility Model Showa 59-125310 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) F23D 11/40 F23D 11/10

Claims (1)

(57) [Claims] 1. A liquid fuel therein having an opening at the top center
Bottomed cylinder with space for vaporization and mixing with combustion air
And Jo vaporizing tube vaporizing tube so as to cover the opening of the vaporizing tube
While being fitted and attached to the distal end opening stepped portion, a circular plate-like cell <br/> La mix made of the burner plate to burn by jetting a mixed gas of the vaporized fuel and air, the upper portion of the vaporizing tube
Attachment part to be screwed and raised from the attachment part
And a heat recovery ring having a cylindrical heat recovery unit, the
A number of burner plates are drilled in the axial direction of the vaporizing cylinder.
Having a flame hole along the outer periphery of the burner plate,
One, the heat recovery portion of the heat recovery ring, its inner surface burner
It is located above the outer flame hole formed in the plate.
The inner diameter of the heat recovery section to the outer dimensions of the burner plate.
Smaller than the heat recovery ring.
The inner edge of the attached part faces the upper surface of the outer peripheral part of the burner plate
So that it extends toward the center of the vaporizer
The extension portion is provided with a leaf spring for pressing against the upper surface of the outer peripheral portion of the burner plate to press and hold the burner plate on the vaporizing cylinder.