JP2803350B2 - Combustor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a combustor used for an oil heater or the like.

2. Description of the Related Art Generally, a combustor of this type is provided with a nozzle 2 as shown in FIG.
The supplied liquid fuel is vaporized in the vaporization and mixing cylinder 1 and mixed with the combustion air supplied from the air supply 3,
The premixed gas of air and fuel is vaporized and built into the burner head 5 at the top of the mixing cylinder 1, the pressure equalizing plate 13, the resistance plate 14, and the rectifying cylinder.
The gas was blown out from a flame port 7 provided on the peripheral wall through 10 to form a flame and burn.

Problems to be Solved by the Invention Burners of this kind generally used for oil heaters are required to ensure stable combustion performance and, in particular, to reduce noise in recent years. However, in the above-mentioned conventional combustor, it was particularly difficult to reduce noise.

That is, in the conventional combustor described above, the vaporization cylinder lid 6 rides above the vaporization / mixing cylinder 1, and a flat pressure equalizing plate 13 having a plurality of small holes rides thereon, and the central equalizing plate 13 on the top surface A resistance plate 14 having a circular opening 14 ′ is placed thereon, and a rectifying cylinder 10 having small holes in a punching shape is placed so as to cover the resistance plate 14, thereby constituting a built-in component of the burner head 5.

Analyzing the role of each built-in component and its effect on noise, first, the vaporizing cylinder lid 6 functions to increase the mixing efficiency of the vaporizing / mixing cylinder 1 by collecting the gas vaporized in the vaporizing / mixing cylinder 1 at one center. Has. However, to collect gas
Extremely generates 500Hz and 800Hz sounds in the 200-1000Hz frequency range. This part is indispensable for this type of burner and is set for combustion performance.

The pressure equalizing plate 13 provided thereon acts to uniformly spread the vaporized gas collected by the vaporizing cylinder lid 6 through the small holes 13 'over the entire circumferential direction, and the vaporized gas is finely dispersed. In addition, it was generated in the above-mentioned vaporization cylinder lid 6 by dispersing by adding pressure loss.
Suppresses the sound of 500 and 800Hz and blocks the sound.

The resistance plate 14 provided thereon guides the vaporized gas dispersed by the equalizing plate 13 to the upper surface of the single burner head 5 without directly going to the flame port 7, thereby increasing the mixing distance of the vaporized gas and increasing the combustion flame. To stabilize However, in order to reassemble at the circular opening 14 'on the upper surface of the resistance plate 14, the pressure was suppressed by the pressure equalizing plate.
0, 800Hz sound is generated again.

The rectifying cylinder 10 has a function of uniformly dispersing the vaporized gas discharged from the resistance plate 14 to the flame port 7 provided on the side peripheral wall of the burner head 5 and does not particularly affect noise.

As can be understood from the above description, the components that affect the noise in the burner head 5 built-in are the pressure equalizing plate 13 and the resistance plate 14, and the presence of the resistance plate 14 inevitably increases the noise.

The present invention has been made in view of such a point, and has as its object to reduce noise without impairing the functions of the pressure equalizing plate and the resistance plate.

Means for Solving the Problems In order to achieve the above object, the present invention provides a bottomed cylindrical vaporizing / mixing cylinder for mixing air and fuel, and a plurality of vaporized gas provided on the outer peripheral wall of the vaporizing / mixing cylinder. And a vaporizing cylinder lid having an assembled portion and a diffusion portion disposed inside the vaporized / mixed cylinder and the burner head, and protruding into the vaporized / mixed cylinder. And a mixing cylinder having a non-porous side peripheral wall, a plurality of small holes on an upper surface, and a bottom-opened cylindrical mixing tube, wherein the mixing cylinder is a vaporizing cylinder. It has a semi-hermetic space larger than the diffusion part formed by the lid, and after further diffusing and mixing the mixed gas of the diffusion part, it is dispersed from the small holes on the upper surface and supplied to the burner head flame outlet. .

According to the present invention, the mixing tube exhibits the effect of dispersing the premixed gas and the silent effect while utilizing the advantages of the conventional pressure equalizing plate and the resistance plate, thereby reducing the overall sound of the appliance by 2 to 3 dB. Further, since the two components of the conventional equalizing plate and the resistance plate are integrated, the number of components can be reduced.

Further, since the space a constituted by the conventional equalizing plate and the vaporizing cylinder lid is substantially enlarged, the effect of dispersing the vaporized gas is further enhanced, the balance in the circumferential direction of the flame is adjusted, and both when the air is excessive and when the air is insufficient. It shows stable flame formation, widens the combustible width and shows more stable combustion performance than before.

An embodiment of the present invention will be described below with reference to FIG.
Reference numeral 1 denotes a bottomed cylindrical vaporizing / mixing cylinder. A fuel supply nozzle 2 and a combustion air supply pipe 3 face an eccentric position of a part of the peripheral wall. Reference numeral 4 denotes a heater buried in the vaporization / mixing cylinder 1, reference numeral 5 denotes a burner head covering the upper opening of the vaporization / mixing cylinder 1, and reference numeral 6 denotes a collecting portion 6 'and a diffusing portion 6a protruding into the vaporization / mixing cylinder 1. This is a vaporization cylinder lid formed with. Reference numeral 7 denotes a flame port formed on the peripheral wall of the burner head 5.

Reference numeral 8 denotes a perforated cylinder such as a wire mesh attached to the inside and outside of the peripheral wall of the burner head 5, and is fixed to the burner head 5 by spot welding between each flame port. Reference numeral 9 denotes a mixing cylinder provided above the vaporization cylinder lid 6 and formed in a cantilevered shape, and the side peripheral wall is made non-porous.
Inside it is formed a space A 9a which is a semi-enclosed space for promoting the diffusion of the mixed gas, and a number of small holes 9 'are formed in the ceiling wall.
Is formed. Reference numeral 10 denotes a rectifying cylinder provided between the mixing cylinder 9 and the burner head 5. Reference numeral 12 denotes a spark discharger provided to face one of the flame ports 7, and reference numeral 11 denotes a burner case surrounding the vaporizing and mixing cylinder 1.

In the above configuration, the vaporizing and mixing cylinder 1 is provided by a pump or the like.
The fuel injected into the inside is vaporized in the vaporization / mixing cylinder 1 heated to a high temperature by the sheath heater 4, and is premixed with the combustion air sent into the vaporization / mixing cylinder 1 by a blower or the like. This premixed vaporized gas passes through the collecting portion 6 'of the vaporizing cylinder lid 6, the diffusion portion 6a, the A space 9a of the mixing cylinder 9, and the small hole 9' while rotating inside the vaporizing and mixing cylinder 1, and further passes through the rectifying cylinder 10. After passing through, it is jetted to the inner wall of the burner head 5 and jetted from the flame opening 7 of the outer peripheral wall.

When ignited by the spark discharger 12, combustion starts and the flame outlet 7
A flame is formed almost in close contact with the outer perforated cylinder 8 in the vicinity.

The present invention employs a pressure equalizing plate 13 provided above the vaporizing cylinder lid 6 in the related art.
This is characterized in that the configuration is made up of a new component called a mixing cylinder 9 formed on the upper surface of the resistance plate 14. This makes it possible to expand the space a formed by the vaporizing cylinder lid 6 and the pressure equalizing plate 13 to the A space 9a, sufficiently diffuse the vaporized gas discharged from the vaporizing cylinder lid 6, and The vaporized gas is further dispersed in the upper small holes 9 ', so that the resistance can be reduced and the mixing efficiency can be increased as compared with the conventional case.

It is now possible to achieve the function of increasing the mixing distance between the resistance plate 14 and the noise reduction of the combustion noise due to the dispersion provided by the conventional pressure equalizing plate 13 with a single component. , The total instrument noise level is 2-3d
B can be reduced, and noise values at frequencies of 500 and 800 Hz, which are particularly harsh, can be dramatically reduced.

In addition, due to the enhancement of the dispersing effect, the mixing balance in the circumferential direction is maintained, the flame is uniformly formed in the flame port 7, and the combustion width (air-fuel ratio) of substantially 5 to 10% is expanded to achieve stable combustion. Performance was achieved.

Advantageous Effects of the Invention As is clear from the above embodiments, according to the present invention, the following effects can be obtained by combining the conventional pressure equalizing plate and the resistance plate to make the mixing cylinder 9 having an integrated structure taking advantage of each characteristic. Is obtained.

It is possible to drastically reduce the overall noise of equipment such as a hot air heater.

It is possible to provide a combustor having a stable combustion performance in which the mixing balance of air and vaporized gas is improved, the combustion flame state is stable, and the production variation is small.

By reducing the number of parts, rationalization and cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a combustor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional combustor. 1 ... vaporization / mixing cylinder, 5 ... burner head, 7 ... flame port, 6 ... vaporization cylinder lid, 9 ... mixing cylinder, 9 '... small hole.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23D 11/10 F23D 11/40

Claims (1)

(57) [Claims] 1. A bottomed cylindrical vaporizing and mixing cylinder for mixing air and fuel, and a vaporized and mixing cylinder for combusting vaporized gas from the vaporizing and mixing cylinder with a plurality of flame ports provided on its outer peripheral wall. A burner head, a vaporization cylinder lid having a collecting part and a diffusion part disposed inside the vaporization / mixing cylinder and the burner head, and having a gathering part and a diffusion part projecting into the vaporization / mixing cylinder, and disposed above the non-porous. It has a side peripheral wall, has a plurality of small holes in the upper surface, and has a mixing cylinder configured in a cylindrical shape in which the bottom face is open, and the mixing cylinder is a semi-enclosed space larger than the diffusion portion formed by the vaporization cylinder lid. A combustor comprising: further diffusing and mixing the mixed gas in the diffusion section, and then dispersing the mixed gas through small holes on the upper surface to supply the gas to the burner head.