JP2735427B2 - 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 used for a petroleum gasification type hot air heater such as an oil fan heater, and more particularly to a combustion apparatus capable of reducing combustion odor. .

[0002]

2. Description of the Related Art A conventional combustion device (hereinafter referred to as a conventional device).
Will be described based on FIG. 4 and FIG. here,
FIG. 4 is a sectional view of a main part of the conventional apparatus, and FIG. 5 is an exploded perspective view of a burner constituting the above conventional apparatus. As shown in FIG. 1, the conventional apparatus includes a vaporizer 10, a mixing tube 20, a burner 30, and the like. The vaporizer heats and vaporizes a liquid fuel such as kerosene to form a vaporized gas A, and includes a nozzle 11. The mixing pipe 20 mixes the vaporized gas A vaporized by the vaporizer 10 and injected from the nozzle 11 with the primary air B for combustion to form a mixed gas C. Is connected to the burner 30 provided at the upper part of the mixing tube 20 through the air. A current plate 22 is provided between the outlet end of the opening 21 and a burner table 32 described later. The current plate 22 has a function of improving the mixing state of the vaporized gas A and the primary air B for combustion and uniformly dispersing the mixed gas pressure in all the flame holes. The burner 30 includes a burner plate 31, a burner base 32, a packing 33, a plate retainer 34, a wire mesh 35, a wire mesh retainer 36, and the like. The burner plate 31 is formed in a plate shape using, for example, a ceramic material, and has a leg portion 31A on a peripheral edge thereof. In addition, a large number of flame holes 311 are formed on the surface (flame hole surface 312) at predetermined intervals. The burner base 32 has a substantially cylindrical shape, and its upper peripheral portion is expanded outward to form a side wall 32A and a bottom wall 32B. Then, the leg 31A of the burner plate 31 is placed on the bottom wall 32B. The base is fixed to the mixing tube 20.

The packing 33 is made of, for example, an alumina / silica material in a strip shape, and is fitted over the entire periphery between the outer peripheral surface of the burner plate 31 and the side wall 32A of the burner base 32. The above plate holder 3
Reference numeral 4 denotes an upper part formed in a frame whose diameter is reduced, and an opening 341 is opened in the upper end surface. In addition, the opening 341
A protruding edge 34A that is bent upward is formed on the peripheral edge of. Further, on the lower end surface, for example, four claws 342 protruding downward are provided. The burner 30 according to the above configuration is assembled in the following procedure. The packing 33 is wound around the burner plate 31 and attached to the burner base 32. The wire mesh 35 is placed on the burner plate 31, and the wire mesh presser 3
Press at 6. Further, a plate retainer 34 is placed on the upper part, and this is inserted into the burner base 32. The claw 342 is bent, and the burner plate 31, the packing 33, the wire mesh 35 and the wire mesh press 36 are fixed to the burner base 32. Next, the operation of the conventional device having the above configuration will be described. The liquid fuel flowing into the vaporizer 10 by the action of an electromagnetic pump (not shown) is heated and vaporized by the vaporizer 10 to become a vaporized gas A, and is injected from the nozzle 11 toward the mixing pipe 20. At the same time, the primary air B for combustion is sucked into the mixing pipe 20 while increasing the suction effect in the venturi section 23, and is mixed with the vaporized gas A inside the mixing pipe 20 to become a mixed gas C. The mixed gas C rises from the opening 21 and is further mixed by the rectifying plate 22 to be mixed with the burner plate 31.
To the flame hole 311. Then, the mixed gas C is ignited by an igniter (not shown), and the flame holes 311 serve as flame holes and burn. Thereby, for example, indoor heating is performed.

[0004]

However, in the conventional apparatus as described above, the heat conduction of the burner plate 31 is poor even in the initial stage of ignition and stable combustion, particularly in the case of weak combustion, and the packing 33 and the mixing pipe are not used. Temperatures such as 20 tend to be low. This consists of the plate holder 34 and the burner base 32
Secondary air D for combustion flowing from the gap G of the side wall 32A
As a result, the side wall 32A of the burner base 32 is cooled, and the packing 33, the mixing pipe 20 and the like in contact therewith are affected. In the initial state of ignition, the burner base 3
Since the gas 2 is cooled, a part of the vaporized gas A comes into contact with the inside of the packing 33 and the mixing pipe 20 to be reliquefied. Then, as the combustion time elapses, the burner base 32 and the packing 3
3. The temperature of the mixing pipe 20 and the like also gradually rises, and the fuel that has been reliquefied is revaporized with this, and is discharged as revaporized unburned gas from around the plate holder 34. These have been major factors in the generation of so-called combustion odor. The source of the combustion odor is due to the re-vaporization of the fuel on the surface of the packing 33 and the inside of the mixing tube 20. To prevent this, the temperature of the packing 33 and the mixing tube 20 is increased at the beginning of combustion. It is necessary to keep these at high temperatures even during combustion at increased speed.
It is also necessary to bring the re-vaporized unburned gas into contact with the combustion flame to oxidize and burn. However, in the above-described conventional apparatus, it has been difficult to prevent the generation of re-vaporized unburned gas or to completely burn it. Therefore, the present invention has been made in view of the above circumstances, and has as its object to provide a combustion device having a structure capable of effectively reducing combustion odor.

[0005]

The main means adopted by the present invention to achieve the above-mentioned object is that the gist of the invention is that a vaporizer for vaporizing fuel and a vaporized gas vaporized by the vaporizer are primarily used. A mixing pipe for mixing with air to form a mixed gas, a burner plate disposed on an upper part of a burner stand connected to the mixing pipe, and having a plurality of flame holes for burning the mixed gas, And a plate retainer formed in a substantially cylindrical shape having an opening for causing a flame by combustion to rise, supporting a periphery of the burner plate, and fixing the burner plate to the burner base. ,
A combustion apparatus according to the present invention, wherein the area of the opening of the plate retainer is substantially equal to the area of the burner plate in which a flame hole is formed, and a flameless hole is formed in a central portion of the burner plate. .

[0006]

By making the area of the opening of the plate holder approximately equal to the area of the burner plate in which the flame hole is formed, the combustion flame can be gathered and started up at the opening. At the same time, since the flameless hole is formed in the center of the burner plate, the plate retainer can contact the combustion flame over a wide range,
The temperature will rise quickly. Also, during combustion,
The temperature around the plate holder and the mixing tube is maintained at a high temperature due to the conduction heat of the plate holder and the effects of combustion flame and combustion heat from the inside. Therefore, the amount of vaporized gas adhering to the periphery of the plate retainer and the mixing tube at the initial stage of ignition is extremely reduced. Thereby, the combustion odor can be effectively reduced.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. The following embodiment is an example embodying the present invention and is not intended to limit the technical scope of the present invention. Here, FIG. 1 is a cross-sectional view of a main part of a combustion device according to an embodiment of the present invention, FIG. 2 is an external perspective view in a state where a part of a plate holder constituting the combustion device is cut away, and FIG. Fig. 3 shows the structure of a burner plate constituting the combustion device,
(A) is a plan view and (B) is a side sectional view. Elements common to the conventional combustion apparatus shown in FIGS. 4 and 5 are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 1, the combustion apparatus according to this embodiment includes a vaporizer 10, a mixing pipe 20, a burner 300, and the like, and has a basic structure substantially similar to that of a conventional combustion apparatus. The following description focuses on the characteristic components that differ from the conventional device. That is, the burner 300
Burner plate 310, burner base 32, packing 33,
It is provided with a plate retainer 40, a wire mesh 35, a wire mesh retainer 36, and the like. The plate holder 40 is shown in FIG.
As shown in the figure, the frame 401 is formed in a frame-like body, and has a step 401 whose peripheral edge at the upper end face is bent inward and extends. An opening 402 is formed so as to be surrounded by the step 401. The opening 402 has a function of causing a flame due to combustion to rise at an upper portion thereof, and has an area equivalent to an area S of a region (flame hole surface 312) of the burner plate 310 (see FIG. 3) where the flame holes 311 are formed. W. Further, a projection 403 bent upward is formed on the periphery of the opening 402. Further, on its lower end surface, for example, four claws 4 protruding downward.
04 is provided. And the burner plate 3
As shown in FIG. 3, reference numeral 10 has a non-flame hole portion 340 in which a flame hole 311 is not formed in a central portion thereof. The burner 300 according to the present embodiment configured as described above is assembled in the same procedure as the conventional burner 30 using the plate holder 40 (see FIG. 5).

Next, the operation of the combustion apparatus according to the present embodiment, which includes the burner 300 assembled as described above, will be described. First, the mixed gas C is obtained by mixing the vaporized gas A from the vaporizer 10 and the primary air B for combustion inside the mixing pipe 20. The above mixed gas C
Is connected to the burner plate 310 via the rectifying plate 22
It is led to 1. The combustion flame 37 is formed by being ignited by an igniter (not shown) held above and separated from the burner plate 310. The combustion flame 37 formed on the flame hole surface 312 of the burner plate 310 spreads from the position of the outermost flame hole 313, and is used for combustion.
Oxidation reaction occurs while contacting the secondary air D to form an oxidizing flame. The burner plate 310 has a non-flame hole portion 340 at the center thereof as described above, and the area S of the flame hole surface 312 is formed to be substantially equal to the area W of the opening 402 of the plate retainer 40. Therefore, the combustion flame 37 has a protruding edge 40.
Get together in part 3 and get up. Since the protruding edge 403 comes into contact with the combustion flame 37 over a wide range, the plate retainer 40 is quickly heated and heated. On the other hand, the temperature of the packing 33 is rapidly increased by the conduction heat from the outside of the plate holder 40 and the combustion flame 37 and the combustion heat from the inside. Also, the temperature of the mixing tube 20 is increased by the conduction heat from the plate retainer 40 and the burner table 32, and the high temperature state is maintained. Therefore, in the initial stage of ignition, the vaporized fuel that has adhered to the packing 33 and the inner surface of the mixing pipe 20 becomes a re-vaporized unburned gas due to a rapid temperature rise, and reaches the portion of the protruding edge 403. On the other hand, a small amount of secondary air D for combustion flows from the gap G due to the generation of the combustion draft 38, but the re-evaporated unburned gas is pulled by the secondary air D and comes into contact with the combustion flame 37, resulting in high efficiency. Burns to the original.
The secondary air D for combustion flows from the gap G, rises along the step 401, and flows out of the protruding edge 403, so that it directly acts on the flame hole surface 312 of the burner plate 310. Therefore, the problem that the combustion flame 37 fluctuates is avoided, and a stable combustion state can be obtained.

[0009]

As described above, the present invention provides a vaporizer for vaporizing a fuel, a mixing pipe for mixing a vaporized gas vaporized by the vaporizer with primary air to form a mixed gas, A burner plate disposed above the communicating burner base and having a plurality of flame holes for burning the above-mentioned mixed gas, and having a substantially cylindrical shape having an opening above the burner plate for causing a flame by combustion to rise. And a plate retainer for supporting the periphery of the burner plate and fixing the burner plate to the burner pedestal, wherein the area of the opening of the plate retainer is determined by the size of the flame hole of the burner plate. Since the combustion device is characterized in that the area of the perforated area is made substantially equal and a flameless hole is formed in the center of the burner plate, the vaporized gas from the vaporizer is supplied to the inside of the mixing pipe. Liquefaction And, even if reburned unburned gas is generated due to this, the unburned gas is effectively brought into contact with the combustion flame and burned, so that the combustion odor is significantly reduced. Can be.

[Brief description of the drawings]

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

FIG. 2 is an external perspective view in a state where a part of a plate retainer constituting the combustion device is cut away.

3A and 3B show the structure of a burner plate constituting the combustion device, wherein FIG. 3A is a plan view and FIG. 3B is a side sectional view.

FIG. 4 is a sectional view of a main part of a conventional combustion device.

FIG. 5 is an exploded perspective view of a burner included in the conventional combustion device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Vaporizer 20 ... Mixing tube 32 ... Burner stand 40 ... Plate holder 300 ... Burner 310 ... Burner plate 311 ... Flame hole 312 ... Flame hole surface 340 ... Flameless hole part 401 ... Step 402 ... Opening 403 ... Protrusion

Claims (1)

(57) [Claims] 1. A vaporizer for vaporizing a fuel, a mixing pipe for mixing a vaporized gas vaporized by the vaporizer with a primary air to form a mixed gas, and a burner stand connected to the mixing pipe. A burner plate having a large number of flame holes for burning the mixed gas, and a substantially cylindrical shape having an opening above the burner plate for raising the flame by combustion. And a plate retainer for supporting and fixing the burner plate to the burner pedestal, wherein the area of the opening of the plate retainer is substantially equal to the area of a region of the burner plate where a flame hole is formed. A combustion apparatus characterized in that it is equal and a non-flame hole is formed in a central portion of the burner plate.