JP3143283B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus such as a vaporization combustion apparatus having a ceramic burner head.
In particular, the present invention relates to a combustion device that detects the presence or absence of a flame formed on a burner head by a frame rod.

[0002]

2. Description of the Related Art A conventional burner of this type in which a ceramic burner head is attached to the opening of a vaporizing cylinder is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 4-320708. In this conventional combustion device, a screw portion is provided in the opening of the vaporizing cylinder, and the burner head is fixed to the opening of the vaporizing cylinder by an annular member screwed to the screw portion. Not only is it complicated, but the burner head is made of ceramics, which is an insulating material.The ground between the burner head and the vaporizing cylinder is only at the outer periphery of the burner head. High flame detection cannot be performed.
Further, since the mixed gas is ejected upward from the ceramic burner head, there is a concern that the flame may flow out of the combustion chamber, and the combustion chamber cannot be miniaturized.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and aims to improve the flame detection accuracy while simplifying the mounting structure of a ceramic burner head. The purpose is to make the combustion chamber compact.

[0004]

According to the present invention, a ceramic burner head is mounted on a burner body.
The flame rod is disposed in the vicinity of the burner body, in a combustion apparatus that detects the presence or absence of flame formed in the burner head in the frame rod, the burner body
Has an opening in the upper center and has fuel and combustion air inside.
It is necessary to provide a bottomed cylindrical vaporizer with a space for mixing.
The ceramic burner head is formed of a conductive material as described above, and the ceramic burner head is arranged along the outer peripheral portion of the burner head.
And a large number of flame holes drilled in the axial direction of the cylinder of the vaporizing cylinder.
Having, and so as to cover the upper end opening of the vaporization cylinder
While being fitted into the opening of the vaporizing tube, the flame toward the outside from the center of the burner head on the burner head
The flange has a flange that gradually increases the distance from the hole.
A conductive flame spreader plate facing the burner head is mounted, and the flame spreader plate and the burner head are attached to the burner main body by a conductive mounting rod.

[0005]

With this configuration, the ceramic burner head can be fixed to the burner body using the flame spreader and the mounting rod, and the mounting structure of the ceramic burner head can be simplified. Also, since the flame spreader placed on the burner head is electrically connected to the burner main body via the mounting rod, the flame spreader exposed to the flame in a wide range can be reliably grounded to the burner main body. As a result, a stable high-level frame current can be obtained, and the accuracy of flame detection can be improved. Furthermore, the flame spread plate allows the flame formed on the burner head to be spread outward, so that the flame does not flow out of the combustion chamber without having to make the combustion chamber so large. Can be reduced in size.

[0006]

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 as a burner body 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 and 3 is the vaporizing cylinder 1
A primary air passage for supplying primary air for combustion into the inside, and the 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 numeral 6 denotes a combustion cylinder which forms a combustion chamber 7 provided upright on an upper flange 5A of the burner case 5, and reference numeral 8 denotes a secondary cylinder which supplies secondary combustion air to the outside of the vaporization cylinder 1 through the burner case 5. The secondary air passage 8 communicates with the blower 4 like the primary air passage 3. 9 is a liquid fuel (kerosene) in an oil tank 11 using a fuel pump 10
A fuel nozzle 12 for supplying the gas to the inside of the vaporizing cylinder 1, a throttle plate 12 disposed at an upper portion in the vaporizing cylinder 1, and a disk below a throttle passage 13 formed in the center of the throttle plate 12. A baffle plate 14 is provided integrally with the diaphragm plate 12, and the diaphragm plate 12 is placed on a first step 15A formed in the vaporizing cylinder 1.

Reference numeral 16 denotes a ceramic burner head fitted into the opening of the vaporizing cylinder 1. The burner head 16 is resistant to heat shock and has high density and low expansion ceramics such as petalite which is excellent in thermal shock resistance. And the shape is formed in a circular flat plate shape. The burner head 16 is placed on a second step 15B formed on the first step 15A, and its lower surface is in contact with the upper surface of the diaphragm plate 12. 17 , 17
There are a number of flame holes provided on the outer peripheral portion of the burner head 16 along the extended surface of the inner periphery of the vaporizing cylinder 1 . These flame holes 17 have the direction of the holes substantially parallel to the axial direction of the vaporizing cylinder 1.
In this way, a plurality of rows are provided in the circumferential direction, and the hole diameter is set to about 1 to 2 mm. 18 is the burner head 1
6 is a through-hole provided in the center of FIG.

Reference numeral 19 denotes a flame spreader placed on a substantially central portion of the upper surface of the burner head 16. This flame spreader 19 is made of a heat-resistant steel plate having conductivity. It comprises a tubular portion 19A and a flame-expanding flange portion 19B which is expanded obliquely outward from the upper edge of the tubular portion 19A . In addition, the flame expanding flange portion 19B
Is a spacing between the flange portion 19B and the burner port 17 is Banahe
Increases gradually from the center of the pad 16 toward the outside.
So that it faces the burner head 16
It is formed and has a larger diameter than the burner head 16.

Reference numeral 20 denotes a mounting rod made of a heat-resistant metal having conductivity. The mounting rod 20 passes through the tubular portion 19A of the flame spreader 19, the burner head 16, and the baffle plate 14, and By screwing the screw portion 20A at the lower end into the screw hole 21 formed in the inner bottom of the vaporizing cylinder 1, the flame expanding plate 19, the burner head 16 and the throttle plate 12 are connected to the vaporizing cylinder 1.
Is to be fixed. The head 20 </ b> B of the mounting rod 20 is in contact with the cylindrical portion 19 </ b> A of the flame spreader 19, and the flame spreader 19 is electrically connected to the vaporizing cylinder 1 via the mounting rod 20.

Reference numeral 21 denotes a flame hole 17 of the burner head 16.
An ignition rod 22 for igniting the mixed gas ejected from the flame rod 22 is a flame rod for detecting the presence or absence of the flame F and detecting the oxygen concentration. The ignition rod 21 and the flame rod 22 are arranged near the vaporizing cylinder 1. The end portion 22A of the frame rod 22 extends into the space between the burner head 16 and the flame spread plate 19.

In the above configuration, when liquid fuel (kerosene) is ejected from the fuel nozzle 9 into the vaporizing cylinder 1, this liquid fuel passes through the ejection pressure of the fuel pump 10 and the primary air passage 3 and enters 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 passes through the throttle passage 13 of the throttle plate 12 and passes through the burner head 1.
6, and is ejected upward from each of the flame holes 17, 17 of the burner head 16. This ejected gas flows outward by being guided by the lower surface of the flame-expanding flange portion 19 </ b> B of the flame-expanding plate 19. It is ignited by the spark 21 and forms a blue fire flame F to perform gasification combustion. At this time, the flame F is spread laterally or obliquely upward by the action of the flame spread plate 19, and the flame spread plate 19 and the tip 22 A of the frame rod 22 are exposed to the flame F.

Thus, the flame spread plate 19 and the frame rod 2
2 is exposed to the flame F, the mounting rod 2
0, vaporizing cylinder 1, burner case 5, frame rod 2
2, a flame current flows through the circuit, and the presence or absence of the flame F and a decrease in the oxygen concentration are detected by the flow of the flame current.

According to the present embodiment, the diaphragm plate 12 is connected to the vaporizing cylinder 1.
After being mounted on the first step 15A, the burner head 16 is fitted into the opening of the vaporizing cylinder 1 and mounted on the second step 15B. Flame spreader 1
9, the flame spreader 19, the burner head 16 and the aperture plate 12 are fastened to the vaporizing cylinder 1 by the mounting rod 20, so that the ceramic burner head 16 and the aperture plate 12
Can be securely and easily fixed to the vaporizing cylinder 1 using the flame spreader plate 19 and the mounting rod 20, and the mounting structure of the burner head made of ceramics can be simplified.

The conductive flame spread plate 19 mounted on the burner head 16 is electrically connected to the vaporizing cylinder 1 through the mounting rod 20, so that the flame spread widely exposed to the flame. The plate 19 can be reliably grounded to the vaporizing cylinder 1, a stable high-level frame current can be obtained, the detection accuracy of the flame F can be increased, and safety can be improved.

Further, the flame F formed in the flame hole 17 of the burner head 16 can be spread outward by the flame spreader plate 19 placed on the burner head 16, so that the length of the combustion cylinder 6 is reduced. Even if it does not lengthen, the flame F
There is no fear of spilling out of the fuel chamber, and the combustion chamber can be downsized. If the combustion chamber is incorporated in an oil fan heater, the oil fan heater can be downsized.

The present invention is not limited to a liquid fuel combustion device, but may be a gas fuel combustion device.

[0018]

As is apparent from the above description, the present invention mounts a ceramic burner head on a burner body, arranges a frame rod near the burner body, and forms the burner head with the frame rod. In the combustion apparatus, which detects the presence or absence of a flame, the burner main body has an opening at the upper center and has fuel and fuel therein.
Vaporization of bottomed cylinder with space to mix with combustion air
It is formed of a conductive material so as to provide a cylinder, and
The Lamix burner head is located on the outer periphery of the burner head.
Drilled in the axial direction of the cylinder of the vaporization cylinder along
It has a number of flame holes and covers the upper end opening of the vaporizing cylinder.
While being fitted in the opening of the vaporizing tube to Migihitsuji, suited outwardly from the center of the burner head on the <br/> burner head
Flange that gradually increases the distance from the flame hole
A conductive flame spreader facing the burner head having a portion is mounted, and the flame spreader and the burner head are attached to the burner main body with a conductive mounting rod. The burner head can be fixed to the burner body using the mounting rod, simplifying the mounting structure of the burner head made of ceramics, and the conductive flame spread plate exposed to the flame is connected to the burner via the mounting rod. Since it is electrically connected to the main body, a stable high-level frame current can be obtained, flame detection accuracy can be improved, and safety can be improved. Further, since the flame can be spread outward by the flame spread plate, the combustion chamber can be reduced in size, and the device can be made compact when incorporated in a device such as an oil fan heater.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a combustion apparatus showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vaporization cylinder (burner main body) 16 Burner head 19 Flame spreader 20 Mounting rod 22 Frame rod

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-26413 (JP, A) JP-A-4-80503 (JP, A) JP-A-3-156204 (JP, A) 320708 (JP, A) JP-A-4-155106 (JP, A) JP-A-59-186649 (JP, U) JP-A-56-89523 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 11/40 F23D 11/10 F23N 5/12

Claims (1)

(57) [Claims] 1. A combustion device having a ceramic burner head mounted on a burner main body, a flame rod disposed near the burner main body, and detecting the presence or absence of a flame formed on the burner head by the frame rod. In the above, the burner main body has an opening
Circle with space for mixing fuel and combustion air
It is formed of a conductive material so as to provide a cylindrical vaporizing cylinder,
The ceramic burner head is connected to the burner head.
In the axial direction of the vaporizer cylinder along the outer circumference of the
It has a number of perforated flame holes, and the upper end of the vaporizing cylinder
And wherein the fitting in the opening of the vaporizing tube so as to cover the opening <br/> both the on the burner head from the center of the burner head
As the distance from the flame increases gradually toward the outside
A combustion flame characterized by mounting a conductive flame spreader facing the burner head with a flange portion, and mounting the flame spreader and the burner head to the burner main body by a conductive mounting rod. apparatus.