JP4135003B2 - Spray combustion equipment - Google Patents

Description

  The present invention relates to a spray-type combustion apparatus used for a water heater or the like.

  In water heaters and the like, spray-type combustion apparatuses that spray and burn liquid fuel such as petroleum are frequently used.

FIG. 7 is a cross-sectional view of a water heater that employs a conventional spray combustion apparatus.
The spray-type combustion apparatus 100 includes a combustion cylinder main body 3 built in a main body portion 2. The main body 2 is roughly divided into a front stage side 5 and a heat exchanger side 6.
The front side 5 of the main body 2 is a rectangular box 11, and a fan 7 is attached to the top. In addition to the combustion cylinder main body 3, a cylinder 15 is concentrically housed inside the front side 5. The cylindrical body 15 is open at the top and closed at the bottom (partition wall 12 side).

On the other hand, the heat exchanger side 6 of the main body 2 has a combustion case 8 configured in a rectangular tube shape by a copper plate or the like, and a heat exchanger 10 is built in the lower part.
The boundary between the front side 5 and the heat exchanger side 6 of the main body 2 is partitioned by a partition wall 12. In the center of the partition wall 12, there is an opening to which the front end portion of the combustion cylinder main body 3 is attached. Further, an opening 13 serving as a vent hole is provided in the peripheral portion of the partition wall 12.

The combustion cylinder main body 3 is a type called a reverse combustion type | mold, Comprising: A flame is injected toward the downward direction. The illustrated combustion cylinder main body 3 is a combustion amount variable type gun type burner using a so-called two-stage combustion cylinder for burning liquid fuel, and the airflow is substantially downward.
That is, the combustion cylinder main body 3 includes an open end nozzle housing cylinder 17 having a fuel injection nozzle 16 and an open end combustion cylinder 18 connected to the open end of the nozzle storage cylinder 17. The former nozzle storage cylinder 17 further has an inner cylinder and an outer cylinder, and an air inlet (not shown) is provided in the outer cylinder. And it has the structure where a part of the air which entered the outer cylinder is introduced into the inner cylinder.

  Further, the combustion cylinder 18 includes a first combustion cylinder 20 connected to the open end of the nozzle housing cylinder 17 and a larger-diameter second combustion cylinder 21 further connected to the first combustion cylinder 20. . The first combustion cylinder 20 and the second combustion cylinder 21 are also provided with a large number of air inlets 30.

The combustion cylinder main body 3 is on the front stage side 5 described above, and an open end 19 is opened from the partition wall 12 toward the heat exchanger side 6.
Further, a fuel diffusion plate 32 is attached near the open end 19 of the combustion cylinder body 3. The fuel diffusion plate 32 is a member for promoting the stirring of the fuel and has a substantially rod shape.

Next, the flow of air and fuel in the spray combustion apparatus 100 will be described.
When using the spray combustion apparatus 100, the blower 7 is activated to send air to the front side 5 of the main body 2, and the fuel pump is operated to inject fuel from the fuel injection nozzle 16.
The air that has entered the front side 5 from the blower 7 enters the outer cylinder of the nozzle storage cylinder 17, and a part of the air enters the inner cylinder of the nozzle storage cylinder 17 and is injected from the fuel injection nozzle 16. Mixed with liquid fuel. The mixed fuel and air are sent into the combustion cylinder 18 and burned in the combustion cylinder 18. The generated flame is injected from the inside of the combustion cylinder 18 toward the heat exchanger side 6.

A part of the air that has entered the front stage 5 enters the cylinder 15 and is introduced into the combustion cylinder 18 from the air inlet 30 provided in the first combustion cylinder 20 and the second combustion cylinder 21, so-called. Used as combustion for secondary air.
Further, the air flowing outside the cylinder 15 enters the heat exchanger side 6 directly from the opening 13 of the partition wall 12 and contributes to combustion as secondary air.

In the configuration described above, two rows of air flow paths 40 and 41 are formed in the box 11 on the front side 5. That is, in the box 11, there are an air flow path 40 formed between the combustion cylinder 18 and the cylinder 15 and an air flow path 41 formed between the cylinder 15 and the box 11. The reason why the air flow path 40 is formed by the combustion cylinder 18 and the cylinder 15 in this way is to cool the combustion cylinder 18 and prevent the front side 5 from being heated.
That is, in the spray-type combustion apparatus 100, the front side 5 includes wiring such as an ignition plug and an ignition sensor and a member made of a synthetic resin having relatively low heat resistance. Therefore, if the front side 5 is excessively heated, these may be damaged.
Therefore, in the spray combustion apparatus 100 of the prior art, as described above, an air layer is formed around the combustion cylinder 18 by the air flow path 40 so that the heat of the combustion cylinder 18 does not spread over the entire front side 5. It has been devised.
JP-A-3-282108

In the spray combustion apparatus 100 of the prior art, as described above, an air layer is formed around the combustion cylinder 18 so that the heat on the side surface of the combustion cylinder 18 does not spread over the entire front side 5. Yes.
However, in the prior art, heat diffusion is prevented only on the side surface side of the combustion cylinder 18, and no heat insulation measures are taken for the heat received by the front stage side 5 from the heat exchanger side 6.
That is, in the spray combustion apparatus 100 of the prior art, combustion gas spreads to the heat exchanger side 6 and the partition wall 12 is exposed to a high temperature. For this reason, there is a concern that the front side 5 is heated and a defect occurs.
In particular, when the fuel diffusion plate 32 is provided on the open side of the combustion cylinder main body 3 as in the spray combustion apparatus 100 described with reference to FIG. 7, the fuel diffusion plate 32 is brought into a high temperature state by the flame, and the fuel diffusion plate 32. From this, the heat easily transferred to the front side 5 side, and there was a risk of disconnection or the melting of the resin.
Another problem is that the side wall 25 of the combustion case 8 on the heat exchanger side 6 is thinned by the action of a flame. In the spray combustion apparatus 100 of the prior art, no countermeasure is taken against the thinning.

Accordingly, the present invention focuses on the above-mentioned problems of the prior art, and an object thereof is to develop a spray-type combustion apparatus that can prevent heat from being transmitted to the front stage side of the main body and eliminate problems caused by heat. It is.
In addition, another object of the present invention is to develop a spray-type combustion apparatus that prevents the combustion case from thinning and has a long life.

In order to solve the above-mentioned problem, the invention according to claim 1 is a combustion in which a main body portion separated by a partition wall into a heat exchanger side and a front stage side, and one end constituting a combustion chamber are opened by spraying fuel. In a spray-type combustion apparatus having a cylinder main body, the combustion cylinder main body is on the front stage side of the main body section, the open end opens toward the heat exchanger side, and an air flow path is formed in the front stage side of the main body section the Yes combustion casing having a side wall in the heat exchanger side of the main body portion is provided, in the vicinity of a by partition wall heat exchanger side of the main body portion, a partition wall substantially parallel guide walls are provided, wherein A gap is formed between the partition wall and the guide wall by the guide wall partially contacting the partition wall at the convex portion, and a side wall portion extending along the side wall of the combustion case on each side of the guide wall There are formed, air blown into the gap, the four-way Spread, and a spray combustion apparatus, wherein Ru flow along said partition wall and said side walls to the heat exchanger side.

In the spray-type combustion apparatus of the present invention, the guide wall is attached at a convex part in partial contact with the partition wall. For this reason, the guide wall is located in the immediate vicinity of the partition wall, the air flow velocity is high, and the air between the guide wall and the partition wall is frequently replaced. Therefore, even if the air between the guide wall and the partition wall is heated by the heat of the guide wall, the amount of heat transferred to the partition wall side is small.
Further, according to the present invention, there is almost no need to adjust the position of the guide wall, and the guide wall can be easily attached.

The invention according to claim 2 for solving the same problem is the spray-type combustion apparatus according to claim 1, wherein a fuel diffusion plate that is heated by a flame is attached to the guide wall. There is .

  In the spray combustion apparatus of the present invention, air is blown between the partition wall and the guide wall from an opening provided in the partition wall. Thus, in this invention, since air is directly blown in from a partition wall, air flows through the site | part nearest to the partition wall. In the present invention, air abuts the guide wall in the vertical direction and spreads around the guide wall, so that the air flow covers substantially the entire partition wall. Therefore, according to the present invention, the partition wall is almost completely shielded, and heat transfer to the front side is prevented.

As described above, in the spray combustion apparatus of the present invention , heat on the heat exchanger side is not transmitted to the partition wall, and the temperature on the front stage side does not rise. Therefore, the member on the front side is not damaged by heat. Therefore, the spray type combustion apparatus of the present invention has an effect that there are few failures.

In particular, in the spray-type combustion apparatus according to claim 1 , a combustion case having a side wall is provided on the heat exchanger side of the main body, and the partition wall is located near the partition wall on the heat exchanger side of the main body. A guide wall substantially parallel to the guide wall is formed, and a gap is formed between the partition wall and the guide wall, and a side wall portion extending along the side wall of the combustion case is formed on each side of the guide wall. Since the air blown into the air spreads in all directions and flows to the heat exchanger side along the partition wall and the side wall, the heat on the heat exchanger side is not transmitted to the partition wall, and the temperature on the front stage side Does not rise.
Furthermore, since the guide wall is a convex part and is in partial contact with the partition wall so that a gap is formed between the guide wall and the partition wall, the flat part of the guide wall can be separated from the partition wall with a simple mounting structure. Can be arranged in parallel.

In the spray combustion apparatus according to claim 2 , since the fuel diffusion plate that is heated by the flame is attached to the guide wall, the guide wall is relatively hot, and air in the gap between the guide wall and the partition wall Is heated, but air is continuously supplied to the part, and there is no retention of air. Therefore, no heat is accumulated in the gap between the partition wall and the heat of the part is carried to the heat exchanger side. Accordingly, the heat on the downstream side is not transmitted to the partition wall, and the front side can maintain a low temperature state.
Therefore, the spray type combustion apparatus of the present invention has a long lifetime and can be expected to operate stably indefinitely.

Embodiments of the present invention will be further described below. In the following description of the embodiment, the same members as those in the prior art are denoted by the same reference numerals as those in FIG.
FIG. 1 is a sectional view of a spray combustion apparatus according to an embodiment of the present invention. FIG. 2 is an enlarged view of the vicinity of the partition wall and guide plate of FIG. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is an enlarged view of the vicinity of the partition wall and guide plate of FIG. FIG. 5 is a view in the direction of arrow B in FIG. FIG. 6 is an exploded perspective view of the vicinity of the partition wall and the guide plate.

  In the figure, reference numeral 1 denotes a spray combustion apparatus according to an embodiment of the present invention. The spray-type combustion apparatus 1 of this embodiment has a main body portion 2 divided into a front stage side 5 and a heat exchanger side 6 as in the prior art described above, and a combustion cylinder main body 3 is incorporated therein. It is. Also, the point that the front side 5 of the main body 2 is a rectangular box 11, the point that the cylinder 15 is built in, and the point that the fan 7 is attached to the upper part are the same as in the prior art.

  The heat exchanger side 6 is also exactly the same as the prior art, and has a combustion case 8 configured in a rectangular tube shape by a copper plate or the like, and a heat exchanger 10 is built in the lower part.

Further, the structure of the combustion cylinder main body 3 is exactly the same as that of the conventional one, and an open end nozzle storage cylinder 17 having a built-in fuel injection nozzle 16 and an open end connection type connected to the open end of the nozzle storage cylinder 17. A combustion cylinder 18 is provided, and the nozzle storage cylinder 17 has an inner cylinder and an outer cylinder. The combustion cylinder 18 includes a first combustion cylinder 20 and a second combustion cylinder 21, which are provided with a number of air inlets 30.
And the combustion cylinder main body 3 is in the front | former stage side 5, and the open end is open toward the heat exchanger side 6 from the partition wall 12. FIG. Further, a fuel diffusion plate 32 is attached to the downstream side of the main body 2 of the spray combustion apparatus 100.

The boundary between the front side 5 and the heat exchanger side 6 of the main body 2 is partitioned by a partition wall 12 as in the prior art. Further, an opening 13 serving as a vent hole is provided in the peripheral portion of the partition wall 12.
A characteristic configuration of the spray combustion apparatus 1 of the present embodiment is that a guide wall member 50 is provided. The guide wall member 50 is formed by bending a square plate as shown in FIG. 6, and an opening 51 is provided at the center. The periphery of the opening 51 is a recessed portion 52 that is recessed downward (to the heat exchanger 10 side). The recessed portion 52 is generally circular as shown in FIG. 6, but is provided with two extended portions 53. A slit 55 is provided in the extended portion 53, and both ends of the fuel diffusion plate 32 are engaged, and the fuel diffusion plate 32 is fixed.

Four convex portions 56 are provided on the upper surface (the partition wall 12 side) of the guide wall member 50. The convex portion 56 is trapezoidal toward the partition wall 12 as shown in FIG. 6, and a hole 57 is provided at the center.
Further, as is apparent in each drawing, the guide wall member 50 is folded back on the lower side (on the heat exchanger 10 side), and a side wall portion 60 extending in the vertical direction with respect to the flat plate portion 58 is formed. Yes. That is, each side of the guide wall member 50 has an “L” cross-sectional shape. The length of the side wall portion 60 is about 8% to 20% of the vertical or horizontal dimension of the flat plate portion 58.
The corner portion of the guide wall member 50 has a chamfered shape as shown in FIG. 6, and the side wall portion 60 does not exist at the corner portion. The guide wall member 50 is provided with two attachment pieces 61, and the side wall portion 60 is also missing from this portion. The attachment piece 61 is folded back slightly upward, and its top surface is in the same plane as the top of the convex portion 56. The attachment piece 61 is also provided with a hole 63.

The guide member 50 is attached to the heat exchanger 10 side of the partition wall 12 with a screw (not shown) inserted through the hole 57 of the convex portion 56 and the hole 63 of the attachment piece 61. Here, since the convex portions 56 provided on the guide member 50 and the top surfaces of the mounting pieces 61 are both above the flat plate portion 58 of the guide member 50, only the convex portions 56 and the top surfaces of the mounting pieces 61 are present. The flat plate portion 58 that is in contact with the lower surface of the partition wall 12 and occupies most of the partition wall 12 is positioned substantially parallel to the plane of the partition wall 12. Therefore, a gap 67 is formed between the flat plate portion 58 and the partition wall 12. The gap 67 formed between the flat plate portion 58 and the partition wall 12 is approximately 1 mm to 10 mm, and more preferably 2 to 5 mm.
The opening 13 provided in the partition wall 12 opens into a gap 67 formed between the partition walls 12, and the axis of the opening 13 is orthogonal to the flat plate portion 58.

  Further, since the side wall portion 60 of the guide member 50 is perpendicular to the flat plate portion 58, each side wall portion 60 faces the side wall 25 of the combustion case 8. That is, each side wall 60 extends downward (on the heat exchanger 10 side) along the side wall 25 of the combustion case 8. Accordingly, the side wall portion 60 of the guide member 50 is positioned in parallel to the side wall 25 of the combustion case 8, and a gap 71 is formed therebetween. The gap 71 is approximately 5 mm to 15 mm.

Also in the spray combustion apparatus 1 of the present embodiment, the air that has entered the front side 5 from the blower 7 enters the inner cylinder of the nozzle housing cylinder 17 and is mixed with liquid fuel such as kerosene injected from the fuel injection nozzle 16. Is done. The mixed fuel and air are sent into the combustion cylinder 18 and burned in the combustion cylinder 18. The flame is injected from the inside of the combustion cylinder 18 toward the heat exchanger side 6.
The air flowing through the cylinder 15 enters the combustion cylinder 18 through the air inlet 30 provided in the first combustion cylinder 20 and the second combustion cylinder 21 and is used for combustion as so-called secondary air.

And the air which flows through the air flow path 41 of the outer side of the cylinder 15 enters into the heat exchanger side 6 from the opening 13 of the partition wall 12 like a prior art.
However, in the spray combustion apparatus 1 of the present embodiment, the flat plate portion 58 of the guide member 50 is provided in parallel to the partition wall 12, and the opening 13 provided in the partition wall 12 is provided between the partition wall 12 and the guide member 50. The axis of the opening 13 is orthogonal to the flat plate portion 58.

Therefore, the air that has entered the heat exchanger side 6 from the opening 13 of the partition wall 12 collides perpendicularly with the flat plate portion 58 of the guide wall member 50 and spreads in all directions as shown in FIGS. It flows through a gap 67 between the portion 58 and the partition wall 12. That is, in the spray combustion apparatus 1 of the present embodiment, the gap 67 between the flat plate portion 58 of the guide member 50 and the partition wall 12 constitutes an air flow path.
Here, also in the spray-type combustion apparatus 1 of the present embodiment, the fuel diffusion plate 32 is provided on the open side of the combustion cylinder main body 3 and the downstream side of the partition wall 12 becomes high temperature, but between the guide member 50 and the partition wall 12. Therefore, the downstream heat is not transmitted to the partition wall 12.
That is, in this embodiment, since the fuel diffusion plate 32 is attached to the guide member 50, the guide member 50 becomes relatively high temperature, and the air in the gap 67 between the guide member 50 and the partition wall 12 is heated. Normal temperature air is successively supplied from the air flow path 41 on the front stage side 5 through the opening 13 to the portion, and there is no retention of air. Therefore, no heat is accumulated in the gap 67 between the partition walls 12, and the heat of the part is carried to the heat exchanger 10 side. Therefore, the heat on the downstream side is not transmitted to the partition wall 12, and the front side 5 maintains the low temperature state.

Further, the air spreading along the flat plate portion 58 of the guide member 50 collides with the side wall 25 of the combustion case 8. Here, in this embodiment, the four sides of the guide member 50 are folded back to form the side wall portion 60, and the side wall portion 60 is positioned in parallel to the side wall 25 of the combustion case 8. The air that collided with the gas changes its direction downward and flows through the gap 71 between the side wall 25 of the combustion case 8 and the side wall portion 60 of the guide member 50.
Further, since the side wall portion 60 of the guide member 50 has a certain length, the air is urged downward, and the air is also along the side wall 25 of the combustion case 8 even in a portion where the side wall portion 60 of the guide member 50 is not present. Flowing. Therefore, in the spray combustion apparatus 1 of the present embodiment, air flows along the side wall 25 of the combustion case 8, and an air curtain that flows toward the heat exchanger 10 is formed inside the side wall 25. As a result, the side wall 25 of the combustion case 8 is cooled, and the side wall 25 is prevented from being thinned. Furthermore, the air flowing in the vicinity of the side wall 25 has little contribution to combustion and contains a large amount of oxygen. Therefore, further thinning of the side wall 25 is prevented.

In the embodiment described above, the side wall portion 60 is provided on the guide member 50, and the air flows along the side wall 25 of the combustion case 8. This configuration has an effect of preventing the combustion case 8 from being thinned and is recommended. However, even if a configuration without the side wall portion 60 is adopted, the basic effect of preventing heat conduction to the front stage side. Is demonstrated.
In the above-described embodiment, the guide member 50 is provided with a convex portion, and the planar portion of the guide member is separated from the partition wall 12. This configuration is recommended because the flat plate portion 58 of the guide member can be arranged parallel to the partition wall 12 while having a simple mounting structure. However, if the ease of attachment is sacrificed, for example, the guide member 50 may be screwed to the side wall 25 of the combustion case 8.

  In the present embodiment, the configuration having the fuel diffusion plate 32 is exemplified, but the fuel diffusion plate 32 is of course not essential to the present invention. However, when the fuel diffusion plate 32 is provided on the guide member 50, the fuel diffusion plate 32 is fixed to the recessed portion 52 of the guide member 50 as in the above example, and the high-temperature fuel diffusion plate 32 is separated from the partition wall 12 as much as possible. It is desirable to take care not to transfer heat to the partition wall 12.

It is sectional drawing of the spray type combustion apparatus of embodiment of this invention. It is an enlarged view of the partition wall and guide plate vicinity of FIG. It is AA sectional drawing of FIG. FIG. 4 is an enlarged view of the vicinity of a partition wall and a guide plate in FIG. 3. It is a B direction arrow line view of FIG. It is a disassembled perspective view of a partition wall and the guide plate vicinity. It is sectional drawing of the water heater which employ | adopted the spray type combustion apparatus of the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spray type combustion apparatus 2 Main-body part 3 Combustion cylinder main body 5 Previous stage 6 Heat exchanger side 8 Combustion case 10 Heat exchanger 12 Partition wall 13 Opening 15 Cylindrical body 16 Fuel injection nozzle 18 Combustion cylinder 25 Side wall 32 Fuel diffusion plate 41 Air Flow path 50 Guide wall member 56 Convex part 58 Flat plate part 60 Side wall part 67 Gap 70 Side wall 71 Gap

Claims (2)

It has a main body part divided into a heat exchanger side and a front stage side by a partition wall, and a combustion cylinder body that is sprayed with fuel and has one end constituting a combustion chamber opened, and the combustion cylinder body is on the front side of the main body part In a spray-type combustion apparatus in which an open end opens toward a heat exchanger side and an air flow path is formed in a front stage side of the main body, a combustion case having a side wall is provided on the heat exchanger side of the main body. A guide wall substantially parallel to the partition wall is provided on the heat exchanger side of the main body and in the vicinity of the partition wall, and the guide wall partially contacts the partition wall at the convex portion, thereby separating the partition wall. A gap is formed between the wall and the guide wall, and a side wall portion extending along the side wall of the combustion case is formed on each side of the guide wall, and the air blown into the gap spreads in all directions. And a heat exchanger along the partition wall and the side wall Spray combustion apparatus, wherein the Ru flows into. Fuel diffusion plate become hot by flame spray combustion apparatus according to claim 1, characterized in that is mounted et the guide wall.

Images