JP2001021219A - Heater using combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress increase of Nox by constituting an air intake part formed along a longitudinal direction of a burner of ventilation holes formed correspondingly with length of flame formed at a burner port. SOLUTION: Ventilation holes 25 formed in a rear upper plate 23 of a casing 3 is formed in different sizes correspondingly with flames formed along a longitudinal direction of a burner 2. Cooling amount of combustion gas is regulated by changing amount of supply air to combustion gas passing through an outflow opening 27 by changing the sizes of the ventilation holes 25. The rear upper plate 23 of the casing 3 is fabricated by integrating a top plate and a rear plate so as to eliminate restriction on positions where the ventilation holes 25 are made. An upper air intake part 22 can be constituted of ventilation holes 25 having different shape, so that an appropriate amount of air corresponding to length of flame formed on a burner port of the burner 2 can be supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater using a gas combustion device, and more particularly to a heating device using a gas combustion device.
The present invention relates to an air supply structure that suppresses generation of Ox.

[0002]

2. Description of the Related Art Generally, in a heater such as a gas fan heater, secondary combustion air for flame combustion is supplied through a gap provided in a wall of the heater.

FIG. 4 is a sectional view of a conventional heating device combustion device. The combustion device 1 includes a burner 2 having a burner main body 6 and a combustion box 7 in which a combustion chamber is formed, and a casing 3 having a front lower plate 8, an upper plate 9 and a rear plate 10. The casing 3 has a partition 5 on the outside, and the casing 3
An upper air intake 4 is formed in the upper part of the rear plate 10, and the upper air intake 4 is formed by a gap between the upper plate 9 and the rear plate 10. This gap is an upper plate 9 made of a separate part.
Are formed at regular intervals along the longitudinal direction of the burner 2 at a portion where the lower end portion of the rear plate 10 and the upper end portion of the rear plate 10 overlap. Air is allowed to flow into the combustion chamber from this gap. I have.

FIG. 5 is a side view of the burner 2. 6 is a burner main body, 7 is a combustion box having a combustion chamber, 11 is a primary flame hole, 12 is a secondary flame hole, and 13 is a gas inlet. A fuel nozzle 14 is provided in a gas suction port 13 formed in a lower portion of the burner 2, and gas (fuel) and primary combustion air are sucked. A primary flame hole 11 is provided on the upper side of the burner main body 6, and a plurality of slit flame holes are provided in the primary flame hole 11 in a horizontally long arrangement. Primary flame hole 11
The horizontal flame formed in the above also forms a horizontal flame in the secondary flame hole portion 12.

[0005]

However, the combustion flame of the burner 2 is not always formed to have a uniform length in the longitudinal direction of each of the flame holes 11 and 12, and the flame near the combustion nozzle 14 is not always formed. The length of the flame on the side remote from the combustion nozzle 14 may be long, or the length of the flame formed over the entire length of the flame hole may vary. In this case, there is a problem that the air flowing from the gap 4 of the casing 3 into the combustion device 1 causes a portion where the flame is excessively cooled and a portion where the flame is insufficiently cooled, leading to an increase in NOx.

The present invention solves the above-described problems of the conventional combustion apparatus, and provides a combustion apparatus that suppresses an increase in NOx by supplying flame cooling air by increasing or decreasing according to the length of the flame. The purpose is to provide.

[0007]

In order to achieve the above object, an invention according to claim 1 uses a combustion device having a burner having a horizontally long flame hole and a casing provided with an air intake. In the conventional heater, the air intake formed along the longitudinal direction of the burner is formed by a ventilation hole corresponding to the length of the flame formed in the flame hole.

According to a second aspect of the present invention, in the heater using the combustion device according to the first aspect, the air holes of the air intake portion are formed so as to adjust the amount of air supplied by the air holes having different shapes. Is what it is.

According to a third aspect of the present invention, there is provided a heater using the combustion device according to the first aspect, wherein the ventilation holes of the air intake section are adjusted in the amount of air supply by adjusting the density of the ventilation holes having the same shape. It has been formed.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in FIGS. 4 and 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 3 shows a gas fan heater (hereinafter referred to as a hot air heater) to which the combustion apparatus according to the present invention is applied. The warm air heater 15 has a partition 5 inside an outer case 16, and is provided with the combustion device 1 and a blower 17 inside the partition 5. Air suction ports 18 and 19 are formed in the upper and middle portions of the rear surface of the outer case 16, and a warm air outlet 21 is formed in the lower portion of the front surface.

The combustion device 1 comprises a burner 2 having a burner main body 6 and a combustion box 7 forming a combustion chamber, and a casing 3. The casing 3 includes a rear upper plate 23 forming an upper portion and a rear portion, and a front lower plate 8 forming a front portion and a lower portion.
In the upper part of the rear upper plate 23 of the casing 3, an upper air intake part 22 composed of a plurality of ventilation holes 25 is provided.
A lower air intake 26 is formed in the lower part. A combustion gas outlet 27 is provided at the upper front part of the front lower plate 8 for discharging the introduced air and the combustion gas after combustion.

When the hot air heater 15 is operated, the air sucked from the intermediate air inlet 19 flows into the lower air inlet 26 of the combustion device 1 and becomes primary combustion air and secondary combustion air. After being mixed with fuel and burned, the fuel gas is blown from the combustion gas outlet 27 through the ventilation path 28 between the partition wall 5 and the casing 3, through the blower 17, and from the hot air outlet 21. Among the air sucked from the air inlet 19 in the middle part, the air that has flowed into the combustion device 1 from the ventilation hole 25 of the upper air intake part 22 is a flame formed in the secondary flame hole part 12 of the combustion box 7. The combustion gas is mixed with the combustion gas, and the combustion gas is cooled, and a part of the combustion gas is burned as secondary combustion air to flow out from the combustion gas outlet 27.

FIG. 1 is a view showing one embodiment of a large number of ventilation holes formed in an upper air intake portion of a combustion device. The ventilation hole 25 formed in the rear upper plate 23 of the casing 3 is formed to have a size corresponding to a flame formed along the longitudinal direction of the burner 2. By changing the size of the ventilation hole 25, the amount of air supplied to the combustion gas passing through the outlet 27 can be changed to adjust the cooling amount of the combustion gas. In addition, since the rear upper plate 23 of the casing 3 is formed by integrating the upper plate and the rear plate, there is no limitation on the position where the ventilation hole 25 is provided, and the length of the flame formed in the flame hole 11 of the burner 2 So that an appropriate amount of air can be supplied to the upper air intake section 22.
Are formed by the vent holes 25 having different shapes, it is possible to eliminate the unevenness in the temperature of the flame and suppress the increase in NOx.

FIG. 2 is a view showing a number of air holes formed in an upper air intake portion in another embodiment. The ventilation holes 25 are provided in the rear upper plate 23 of the casing 3, and are formed by changing the intervals of the ventilation holes 25 in accordance with the flame formed along the longitudinal direction of the burner 2. By arranging the ventilation holes 25 in the same size and arranging the ventilation holes 25 at close intervals, the amount of air supplied to the flame can be adjusted. Also,
Since there is no limitation on the position where the ventilation hole 25 is provided, an appropriate amount of air can be supplied to an optimum position in the combustion device 1. Since an appropriate amount of air can be supplied, it is possible to eliminate unevenness in the temperature of the flame and suppress an increase in NOx.

If the two plate parts are integrated into one plate part (rear upper plate) in the heater of the present invention as described above, and the plate parts are provided with ventilation holes 25 to supply air, 1,
Since the ventilation hole 25 in FIG. 2 or another ventilation hole corresponding to the length of the flame can be appropriately formed, the adjustment of the supply amount in the longitudinal direction can be simplified.
Unlike the structure in which the gas flows from the gap between the plates, it becomes easy to adjust the air supply amount by increasing or decreasing in the longitudinal direction of the burner 2.

Further, since the two plate parts are also used as one plate part (rear upper plate), the cost can be reduced by reducing the number of parts and the man-hour for assembling the casing 3.

As described above, the present invention has been described based on one embodiment, but the present invention is not limited to this. In each of the two embodiments, the vent hole 25 of the upper air intake portion 22 is formed in a round shape. However, the shape is not limited to a round hole, and may be an elliptical, polygonal, conical, or slit-shaped hole. May be combined.

[0019]

As described above, according to the present invention,
Since the air intake of the combustion chamber formed along the longitudinal direction of the burner is formed by a large number of air holes corresponding to the length of the flame formed in the burner, the size of each air hole is changed. Alternatively, the air supply amount can be easily adjusted by forming the ventilation holes so as to be dense and dense. By adjusting the air supply amount, the temperature of the flame can be prevented from being too low or too high, so that the generation of NOx can be suppressed with a stable flame.

[Brief description of the drawings]

FIG. 1 is a view showing a number of air holes formed in an air intake section of a combustion device according to an embodiment of the present invention.

FIG. 2 is a view showing a plurality of ventilation holes formed in an air intake portion of a combustion device according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a hot air heater to which the combustion device according to the present invention is applied.

FIG. 4 is a cross-sectional view of a combustion device of a conventional hot air heater.

FIG. 5 is a side view of the burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion apparatus 2 Burner 3 Casing 4 Upper air intake 6 Burner main body 7 Combustion box 11 Primary flame hole 12 Secondary flame hole 15 Hot air heater 18 Upper air inlet 19 Middle air inlet 21 Hot air outlet 22 Upper air intake 23 Rear upper plate 25 Ventilation hole 26 Lower air intake

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akihiko Kogure 1-1, Dainitsuhigashi-cho, Moriguchi-shi, Osaka Sanyo Electric Gas Equipment Co., Ltd. (72) Minoru Sugimoto 2-5-2 Keihanhondori, Moriguchi-shi, Osaka 5 No. 5 Sanyo Electric Co., Ltd. (72) Inventor Mitsunori Omori 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3L028 AC01 AC06

Claims (3)

[Claims] 1. A heater using a combustion device including a burner having a horizontally long flame hole and a casing provided with an air intake, wherein an air intake of a casing formed along a longitudinal direction of the burner is provided. A heating device using a combustion device, wherein the inlet portion is formed by a vent hole corresponding to the length of the flame formed in the flame hole portion. 2. A heater using a combustion apparatus according to claim 1, wherein the ventilation holes of the air intake section are formed so as to adjust the amount of air supply by ventilation holes having different shapes. 3. The combustion apparatus according to claim 1, wherein the ventilation holes of the air intake section are formed so as to adjust the amount of air supply by adjusting the density of the ventilation holes having the same shape. heater.